linux-vybrid_public/drivers/net/ethernet/intel/e1000e/netdev.c

/*******************************************************************************

  Intel PRO/1000 Linux driver
  Copyright(c) 1999 - 2013 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  Linux NICS <linux.nics@intel.com>
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/tcp.h>
#include <linux/ipv6.h>
#include <linux/slab.h>
#include <net/checksum.h>
#include <net/ip6_checksum.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/pm_qos.h>
#include <linux/pm_runtime.h>
#include <linux/aer.h>
#include <linux/prefetch.h>

#include "e1000.h"

#define DRV_EXTRAVERSION "-k"

#define DRV_VERSION "2.1.4" DRV_EXTRAVERSION
char e1000e_driver_name[] = "e1000e";
const char e1000e_driver_version[] = DRV_VERSION;

#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

static void e1000e_disable_aspm(struct pci_dev *pdev, u16 state);

static const struct e1000_info *e1000_info_tbl[] = {
	[board_82571]		= &e1000_82571_info,
	[board_82572]		= &e1000_82572_info,
	[board_82573]		= &e1000_82573_info,
	[board_82574]		= &e1000_82574_info,
	[board_82583]		= &e1000_82583_info,
	[board_80003es2lan]	= &e1000_es2_info,
	[board_ich8lan]		= &e1000_ich8_info,
	[board_ich9lan]		= &e1000_ich9_info,
	[board_ich10lan]	= &e1000_ich10_info,
	[board_pchlan]		= &e1000_pch_info,
	[board_pch2lan]		= &e1000_pch2_info,
	[board_pch_lpt]		= &e1000_pch_lpt_info,
};

struct e1000_reg_info {
	u32 ofs;
	char *name;
};

#define E1000_RDFH	0x02410	/* Rx Data FIFO Head - RW */
#define E1000_RDFT	0x02418	/* Rx Data FIFO Tail - RW */
#define E1000_RDFHS	0x02420	/* Rx Data FIFO Head Saved - RW */
#define E1000_RDFTS	0x02428	/* Rx Data FIFO Tail Saved - RW */
#define E1000_RDFPC	0x02430	/* Rx Data FIFO Packet Count - RW */

#define E1000_TDFH	0x03410	/* Tx Data FIFO Head - RW */
#define E1000_TDFT	0x03418	/* Tx Data FIFO Tail - RW */
#define E1000_TDFHS	0x03420	/* Tx Data FIFO Head Saved - RW */
#define E1000_TDFTS	0x03428	/* Tx Data FIFO Tail Saved - RW */
#define E1000_TDFPC	0x03430	/* Tx Data FIFO Packet Count - RW */

static const struct e1000_reg_info e1000_reg_info_tbl[] = {

	/* General Registers */
	{E1000_CTRL, "CTRL"},
	{E1000_STATUS, "STATUS"},
	{E1000_CTRL_EXT, "CTRL_EXT"},

	/* Interrupt Registers */
	{E1000_ICR, "ICR"},

	/* Rx Registers */
	{E1000_RCTL, "RCTL"},
	{E1000_RDLEN(0), "RDLEN"},
	{E1000_RDH(0), "RDH"},
	{E1000_RDT(0), "RDT"},
	{E1000_RDTR, "RDTR"},
	{E1000_RXDCTL(0), "RXDCTL"},
	{E1000_ERT, "ERT"},
	{E1000_RDBAL(0), "RDBAL"},
	{E1000_RDBAH(0), "RDBAH"},
	{E1000_RDFH, "RDFH"},
	{E1000_RDFT, "RDFT"},
	{E1000_RDFHS, "RDFHS"},
	{E1000_RDFTS, "RDFTS"},
	{E1000_RDFPC, "RDFPC"},

	/* Tx Registers */
	{E1000_TCTL, "TCTL"},
	{E1000_TDBAL(0), "TDBAL"},
	{E1000_TDBAH(0), "TDBAH"},
	{E1000_TDLEN(0), "TDLEN"},
	{E1000_TDH(0), "TDH"},
	{E1000_TDT(0), "TDT"},
	{E1000_TIDV, "TIDV"},
	{E1000_TXDCTL(0), "TXDCTL"},
	{E1000_TADV, "TADV"},
	{E1000_TARC(0), "TARC"},
	{E1000_TDFH, "TDFH"},
	{E1000_TDFT, "TDFT"},
	{E1000_TDFHS, "TDFHS"},
	{E1000_TDFTS, "TDFTS"},
	{E1000_TDFPC, "TDFPC"},

	/* List Terminator */
	{0, NULL}
};

/**
 * e1000_regdump - register printout routine
 * @hw: pointer to the HW structure
 * @reginfo: pointer to the register info table
 **/
static void e1000_regdump(struct e1000_hw *hw, struct e1000_reg_info *reginfo)
{
	int n = 0;
	char rname[16];
	u32 regs[8];

	switch (reginfo->ofs) {
	case E1000_RXDCTL(0):
		for (n = 0; n < 2; n++)
			regs[n] = __er32(hw, E1000_RXDCTL(n));
		break;
	case E1000_TXDCTL(0):
		for (n = 0; n < 2; n++)
			regs[n] = __er32(hw, E1000_TXDCTL(n));
		break;
	case E1000_TARC(0):
		for (n = 0; n < 2; n++)
			regs[n] = __er32(hw, E1000_TARC(n));
		break;
	default:
		pr_info("%-15s %08x\n",
			reginfo->name, __er32(hw, reginfo->ofs));
		return;
	}

	snprintf(rname, 16, "%s%s", reginfo->name, "[0-1]");
	pr_info("%-15s %08x %08x\n", rname, regs[0], regs[1]);
}

static void e1000e_dump_ps_pages(struct e1000_adapter *adapter,
				 struct e1000_buffer *bi)
{
	int i;
	struct e1000_ps_page *ps_page;

	for (i = 0; i < adapter->rx_ps_pages; i++) {
		ps_page = &bi->ps_pages[i];

		if (ps_page->page) {
			pr_info("packet dump for ps_page %d:\n", i);
			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,
				       16, 1, page_address(ps_page->page),
				       PAGE_SIZE, true);
		}
	}
}

/**
 * e1000e_dump - Print registers, Tx-ring and Rx-ring
 * @adapter: board private structure
 **/
static void e1000e_dump(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	struct e1000_reg_info *reginfo;
	struct e1000_ring *tx_ring = adapter->tx_ring;
	struct e1000_tx_desc *tx_desc;
	struct my_u0 {
		__le64 a;
		__le64 b;
	} *u0;
	struct e1000_buffer *buffer_info;
	struct e1000_ring *rx_ring = adapter->rx_ring;
	union e1000_rx_desc_packet_split *rx_desc_ps;
	union e1000_rx_desc_extended *rx_desc;
	struct my_u1 {
		__le64 a;
		__le64 b;
		__le64 c;
		__le64 d;
	} *u1;
	u32 staterr;
	int i = 0;

	if (!netif_msg_hw(adapter))
		return;

	/* Print netdevice Info */
	if (netdev) {
		dev_info(&adapter->pdev->dev, "Net device Info\n");
		pr_info("Device Name     state            trans_start      last_rx\n");
		pr_info("%-15s %016lX %016lX %016lX\n",
			netdev->name, netdev->state, netdev->trans_start,
			netdev->last_rx);
	}

	/* Print Registers */
	dev_info(&adapter->pdev->dev, "Register Dump\n");
	pr_info(" Register Name   Value\n");
	for (reginfo = (struct e1000_reg_info *)e1000_reg_info_tbl;
	     reginfo->name; reginfo++) {
		e1000_regdump(hw, reginfo);
	}

	/* Print Tx Ring Summary */
	if (!netdev || !netif_running(netdev))
		return;

	dev_info(&adapter->pdev->dev, "Tx Ring Summary\n");
	pr_info("Queue [NTU] [NTC] [bi(ntc)->dma  ] leng ntw timestamp\n");
	buffer_info = &tx_ring->buffer_info[tx_ring->next_to_clean];
	pr_info(" %5d %5X %5X %016llX %04X %3X %016llX\n",
		0, tx_ring->next_to_use, tx_ring->next_to_clean,
		(unsigned long long)buffer_info->dma,
		buffer_info->length,
		buffer_info->next_to_watch,
		(unsigned long long)buffer_info->time_stamp);

	/* Print Tx Ring */
	if (!netif_msg_tx_done(adapter))
		goto rx_ring_summary;

	dev_info(&adapter->pdev->dev, "Tx Ring Dump\n");

	/* Transmit Descriptor Formats - DEXT[29] is 0 (Legacy) or 1 (Extended)
	 *
	 * Legacy Transmit Descriptor
	 *   +--------------------------------------------------------------+
	 * 0 |         Buffer Address [63:0] (Reserved on Write Back)       |
	 *   +--------------------------------------------------------------+
	 * 8 | Special  |    CSS     | Status |  CMD    |  CSO   |  Length  |
	 *   +--------------------------------------------------------------+
	 *   63       48 47        36 35    32 31     24 23    16 15        0
	 *
	 * Extended Context Descriptor (DTYP=0x0) for TSO or checksum offload
	 *   63      48 47    40 39       32 31             16 15    8 7      0
	 *   +----------------------------------------------------------------+
	 * 0 |  TUCSE  | TUCS0  |   TUCSS   |     IPCSE       | IPCS0 | IPCSS |
	 *   +----------------------------------------------------------------+
	 * 8 |   MSS   | HDRLEN | RSV | STA | TUCMD | DTYP |      PAYLEN      |
	 *   +----------------------------------------------------------------+
	 *   63      48 47    40 39 36 35 32 31   24 23  20 19                0
	 *
	 * Extended Data Descriptor (DTYP=0x1)
	 *   +----------------------------------------------------------------+
	 * 0 |                     Buffer Address [63:0]                      |
	 *   +----------------------------------------------------------------+
	 * 8 | VLAN tag |  POPTS  | Rsvd | Status | Command | DTYP |  DTALEN  |
	 *   +----------------------------------------------------------------+
	 *   63       48 47     40 39  36 35    32 31     24 23  20 19        0
	 */
	pr_info("Tl[desc]     [address 63:0  ] [SpeCssSCmCsLen] [bi->dma       ] leng  ntw timestamp        bi->skb <-- Legacy format\n");
	pr_info("Tc[desc]     [Ce CoCsIpceCoS] [MssHlRSCm0Plen] [bi->dma       ] leng  ntw timestamp        bi->skb <-- Ext Context format\n");
	pr_info("Td[desc]     [address 63:0  ] [VlaPoRSCm1Dlen] [bi->dma       ] leng  ntw timestamp        bi->skb <-- Ext Data format\n");
	for (i = 0; tx_ring->desc && (i < tx_ring->count); i++) {
		const char *next_desc;
		tx_desc = E1000_TX_DESC(*tx_ring, i);
		buffer_info = &tx_ring->buffer_info[i];
		u0 = (struct my_u0 *)tx_desc;
		if (i == tx_ring->next_to_use && i == tx_ring->next_to_clean)
			next_desc = " NTC/U";
		else if (i == tx_ring->next_to_use)
			next_desc = " NTU";
		else if (i == tx_ring->next_to_clean)
			next_desc = " NTC";
		else
			next_desc = "";
		pr_info("T%c[0x%03X]    %016llX %016llX %016llX %04X  %3X %016llX %p%s\n",
			(!(le64_to_cpu(u0->b) & (1 << 29)) ? 'l' :
			 ((le64_to_cpu(u0->b) & (1 << 20)) ? 'd' : 'c')),
			i,
			(unsigned long long)le64_to_cpu(u0->a),
			(unsigned long long)le64_to_cpu(u0->b),
			(unsigned long long)buffer_info->dma,
			buffer_info->length, buffer_info->next_to_watch,
			(unsigned long long)buffer_info->time_stamp,
			buffer_info->skb, next_desc);

		if (netif_msg_pktdata(adapter) && buffer_info->skb)
			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,
				       16, 1, buffer_info->skb->data,
				       buffer_info->skb->len, true);
	}

	/* Print Rx Ring Summary */
rx_ring_summary:
	dev_info(&adapter->pdev->dev, "Rx Ring Summary\n");
	pr_info("Queue [NTU] [NTC]\n");
	pr_info(" %5d %5X %5X\n",
		0, rx_ring->next_to_use, rx_ring->next_to_clean);

	/* Print Rx Ring */
	if (!netif_msg_rx_status(adapter))
		return;

	dev_info(&adapter->pdev->dev, "Rx Ring Dump\n");
	switch (adapter->rx_ps_pages) {
	case 1:
	case 2:
	case 3:
		/* [Extended] Packet Split Receive Descriptor Format
		 *
		 *    +-----------------------------------------------------+
		 *  0 |                Buffer Address 0 [63:0]              |
		 *    +-----------------------------------------------------+
		 *  8 |                Buffer Address 1 [63:0]              |
		 *    +-----------------------------------------------------+
		 * 16 |                Buffer Address 2 [63:0]              |
		 *    +-----------------------------------------------------+
		 * 24 |                Buffer Address 3 [63:0]              |
		 *    +-----------------------------------------------------+
		 */
		pr_info("R  [desc]      [buffer 0 63:0 ] [buffer 1 63:0 ] [buffer 2 63:0 ] [buffer 3 63:0 ] [bi->dma       ] [bi->skb] <-- Ext Pkt Split format\n");
		/* [Extended] Receive Descriptor (Write-Back) Format
		 *
		 *   63       48 47    32 31     13 12    8 7    4 3        0
		 *   +------------------------------------------------------+
		 * 0 | Packet   | IP     |  Rsvd   | MRQ   | Rsvd | MRQ RSS |
		 *   | Checksum | Ident  |         | Queue |      |  Type   |
		 *   +------------------------------------------------------+
		 * 8 | VLAN Tag | Length | Extended Error | Extended Status |
		 *   +------------------------------------------------------+
		 *   63       48 47    32 31            20 19               0
		 */
		pr_info("RWB[desc]      [ck ipid mrqhsh] [vl   l0 ee  es] [ l3  l2  l1 hs] [reserved      ] ---------------- [bi->skb] <-- Ext Rx Write-Back format\n");
		for (i = 0; i < rx_ring->count; i++) {
			const char *next_desc;
			buffer_info = &rx_ring->buffer_info[i];
			rx_desc_ps = E1000_RX_DESC_PS(*rx_ring, i);
			u1 = (struct my_u1 *)rx_desc_ps;
			staterr =
			    le32_to_cpu(rx_desc_ps->wb.middle.status_error);

			if (i == rx_ring->next_to_use)
				next_desc = " NTU";
			else if (i == rx_ring->next_to_clean)
				next_desc = " NTC";
			else
				next_desc = "";

			if (staterr & E1000_RXD_STAT_DD) {
				/* Descriptor Done */
				pr_info("%s[0x%03X]     %016llX %016llX %016llX %016llX ---------------- %p%s\n",
					"RWB", i,
					(unsigned long long)le64_to_cpu(u1->a),
					(unsigned long long)le64_to_cpu(u1->b),
					(unsigned long long)le64_to_cpu(u1->c),
					(unsigned long long)le64_to_cpu(u1->d),
					buffer_info->skb, next_desc);
			} else {
				pr_info("%s[0x%03X]     %016llX %016llX %016llX %016llX %016llX %p%s\n",
					"R  ", i,
					(unsigned long long)le64_to_cpu(u1->a),
					(unsigned long long)le64_to_cpu(u1->b),
					(unsigned long long)le64_to_cpu(u1->c),
					(unsigned long long)le64_to_cpu(u1->d),
					(unsigned long long)buffer_info->dma,
					buffer_info->skb, next_desc);

				if (netif_msg_pktdata(adapter))
					e1000e_dump_ps_pages(adapter,
							     buffer_info);
			}
		}
		break;
	default:
	case 0:
		/* Extended Receive Descriptor (Read) Format
		 *
		 *   +-----------------------------------------------------+
		 * 0 |                Buffer Address [63:0]                |
		 *   +-----------------------------------------------------+
		 * 8 |                      Reserved                       |
		 *   +-----------------------------------------------------+
		 */
		pr_info("R  [desc]      [buf addr 63:0 ] [reserved 63:0 ] [bi->dma       ] [bi->skb] <-- Ext (Read) format\n");
		/* Extended Receive Descriptor (Write-Back) Format
		 *
		 *   63       48 47    32 31    24 23            4 3        0
		 *   +------------------------------------------------------+
		 *   |     RSS Hash      |        |               |         |
		 * 0 +-------------------+  Rsvd  |   Reserved    | MRQ RSS |
		 *   | Packet   | IP     |        |               |  Type   |
		 *   | Checksum | Ident  |        |               |         |
		 *   +------------------------------------------------------+
		 * 8 | VLAN Tag | Length | Extended Error | Extended Status |
		 *   +------------------------------------------------------+
		 *   63       48 47    32 31            20 19               0
		 */
		pr_info("RWB[desc]      [cs ipid    mrq] [vt   ln xe  xs] [bi->skb] <-- Ext (Write-Back) format\n");

		for (i = 0; i < rx_ring->count; i++) {
			const char *next_desc;

			buffer_info = &rx_ring->buffer_info[i];
			rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
			u1 = (struct my_u1 *)rx_desc;
			staterr = le32_to_cpu(rx_desc->wb.upper.status_error);

			if (i == rx_ring->next_to_use)
				next_desc = " NTU";
			else if (i == rx_ring->next_to_clean)
				next_desc = " NTC";
			else
				next_desc = "";

			if (staterr & E1000_RXD_STAT_DD) {
				/* Descriptor Done */
				pr_info("%s[0x%03X]     %016llX %016llX ---------------- %p%s\n",
					"RWB", i,
					(unsigned long long)le64_to_cpu(u1->a),
					(unsigned long long)le64_to_cpu(u1->b),
					buffer_info->skb, next_desc);
			} else {
				pr_info("%s[0x%03X]     %016llX %016llX %016llX %p%s\n",
					"R  ", i,
					(unsigned long long)le64_to_cpu(u1->a),
					(unsigned long long)le64_to_cpu(u1->b),
					(unsigned long long)buffer_info->dma,
					buffer_info->skb, next_desc);

				if (netif_msg_pktdata(adapter) &&
				    buffer_info->skb)
					print_hex_dump(KERN_INFO, "",
						       DUMP_PREFIX_ADDRESS, 16,
						       1,
						       buffer_info->skb->data,
						       adapter->rx_buffer_len,
						       true);
			}
		}
	}
}

/**
 * e1000_desc_unused - calculate if we have unused descriptors
 **/
static int e1000_desc_unused(struct e1000_ring *ring)
{
	if (ring->next_to_clean > ring->next_to_use)
		return ring->next_to_clean - ring->next_to_use - 1;

	return ring->count + ring->next_to_clean - ring->next_to_use - 1;
}

/**
 * e1000e_systim_to_hwtstamp - convert system time value to hw time stamp
 * @adapter: board private structure
 * @hwtstamps: time stamp structure to update
 * @systim: unsigned 64bit system time value.
 *
 * Convert the system time value stored in the RX/TXSTMP registers into a
 * hwtstamp which can be used by the upper level time stamping functions.
 *
 * The 'systim_lock' spinlock is used to protect the consistency of the
 * system time value. This is needed because reading the 64 bit time
 * value involves reading two 32 bit registers. The first read latches the
 * value.
 **/
static void e1000e_systim_to_hwtstamp(struct e1000_adapter *adapter,
				      struct skb_shared_hwtstamps *hwtstamps,
				      u64 systim)
{
	u64 ns;
	unsigned long flags;

	spin_lock_irqsave(&adapter->systim_lock, flags);
	ns = timecounter_cyc2time(&adapter->tc, systim);
	spin_unlock_irqrestore(&adapter->systim_lock, flags);

	memset(hwtstamps, 0, sizeof(*hwtstamps));
	hwtstamps->hwtstamp = ns_to_ktime(ns);
}

/**
 * e1000e_rx_hwtstamp - utility function which checks for Rx time stamp
 * @adapter: board private structure
 * @status: descriptor extended error and status field
 * @skb: particular skb to include time stamp
 *
 * If the time stamp is valid, convert it into the timecounter ns value
 * and store that result into the shhwtstamps structure which is passed
 * up the network stack.
 **/
static void e1000e_rx_hwtstamp(struct e1000_adapter *adapter, u32 status,
			       struct sk_buff *skb)
{
	struct e1000_hw *hw = &adapter->hw;
	u64 rxstmp;

	if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP) ||
	    !(status & E1000_RXDEXT_STATERR_TST) ||
	    !(er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_VALID))
		return;

	/* The Rx time stamp registers contain the time stamp.  No other
	 * received packet will be time stamped until the Rx time stamp
	 * registers are read.  Because only one packet can be time stamped
	 * at a time, the register values must belong to this packet and
	 * therefore none of the other additional attributes need to be
	 * compared.
	 */
	rxstmp = (u64)er32(RXSTMPL);
	rxstmp |= (u64)er32(RXSTMPH) << 32;
	e1000e_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), rxstmp);

	adapter->flags2 &= ~FLAG2_CHECK_RX_HWTSTAMP;
}

/**
 * e1000_receive_skb - helper function to handle Rx indications
 * @adapter: board private structure
 * @staterr: descriptor extended error and status field as written by hardware
 * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
 * @skb: pointer to sk_buff to be indicated to stack
 **/
static void e1000_receive_skb(struct e1000_adapter *adapter,
			      struct net_device *netdev, struct sk_buff *skb,
			      u32 staterr, __le16 vlan)
{
	u16 tag = le16_to_cpu(vlan);

	e1000e_rx_hwtstamp(adapter, staterr, skb);

	skb->protocol = eth_type_trans(skb, netdev);

	if (staterr & E1000_RXD_STAT_VP)
		__vlan_hwaccel_put_tag(skb, tag);

	napi_gro_receive(&adapter->napi, skb);
}

/**
 * e1000_rx_checksum - Receive Checksum Offload
 * @adapter: board private structure
 * @status_err: receive descriptor status and error fields
 * @csum: receive descriptor csum field
 * @sk_buff: socket buffer with received data
 **/
static void e1000_rx_checksum(struct e1000_adapter *adapter, u32 status_err,
			      struct sk_buff *skb)
{
	u16 status = (u16)status_err;
	u8 errors = (u8)(status_err >> 24);

	skb_checksum_none_assert(skb);

	/* Rx checksum disabled */
	if (!(adapter->netdev->features & NETIF_F_RXCSUM))
		return;

	/* Ignore Checksum bit is set */
	if (status & E1000_RXD_STAT_IXSM)
		return;

	/* TCP/UDP checksum error bit or IP checksum error bit is set */
	if (errors & (E1000_RXD_ERR_TCPE | E1000_RXD_ERR_IPE)) {
		/* let the stack verify checksum errors */
		adapter->hw_csum_err++;
		return;
	}

	/* TCP/UDP Checksum has not been calculated */
	if (!(status & (E1000_RXD_STAT_TCPCS | E1000_RXD_STAT_UDPCS)))
		return;

	/* It must be a TCP or UDP packet with a valid checksum */
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	adapter->hw_csum_good++;
}

static void e1000e_update_rdt_wa(struct e1000_ring *rx_ring, unsigned int i)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct e1000_hw *hw = &adapter->hw;
	s32 ret_val = __ew32_prepare(hw);

	writel(i, rx_ring->tail);

	if (unlikely(!ret_val && (i != readl(rx_ring->tail)))) {
		u32 rctl = er32(RCTL);
		ew32(RCTL, rctl & ~E1000_RCTL_EN);
		e_err("ME firmware caused invalid RDT - resetting\n");
		schedule_work(&adapter->reset_task);
	}
}

static void e1000e_update_tdt_wa(struct e1000_ring *tx_ring, unsigned int i)
{
	struct e1000_adapter *adapter = tx_ring->adapter;
	struct e1000_hw *hw = &adapter->hw;
	s32 ret_val = __ew32_prepare(hw);

	writel(i, tx_ring->tail);

	if (unlikely(!ret_val && (i != readl(tx_ring->tail)))) {
		u32 tctl = er32(TCTL);
		ew32(TCTL, tctl & ~E1000_TCTL_EN);
		e_err("ME firmware caused invalid TDT - resetting\n");
		schedule_work(&adapter->reset_task);
	}
}

/**
 * e1000_alloc_rx_buffers - Replace used receive buffers
 * @rx_ring: Rx descriptor ring
 **/
static void e1000_alloc_rx_buffers(struct e1000_ring *rx_ring,
				   int cleaned_count, gfp_t gfp)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	union e1000_rx_desc_extended *rx_desc;
	struct e1000_buffer *buffer_info;
	struct sk_buff *skb;
	unsigned int i;
	unsigned int bufsz = adapter->rx_buffer_len;

	i = rx_ring->next_to_use;
	buffer_info = &rx_ring->buffer_info[i];

	while (cleaned_count--) {
		skb = buffer_info->skb;
		if (skb) {
			skb_trim(skb, 0);
			goto map_skb;
		}

		skb = __netdev_alloc_skb_ip_align(netdev, bufsz, gfp);
		if (!skb) {
			/* Better luck next round */
			adapter->alloc_rx_buff_failed++;
			break;
		}

		buffer_info->skb = skb;
map_skb:
		buffer_info->dma = dma_map_single(&pdev->dev, skb->data,
						  adapter->rx_buffer_len,
						  DMA_FROM_DEVICE);
		if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
			dev_err(&pdev->dev, "Rx DMA map failed\n");
			adapter->rx_dma_failed++;
			break;
		}

		rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
		rx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);

		if (unlikely(!(i & (E1000_RX_BUFFER_WRITE - 1)))) {
			/* Force memory writes to complete before letting h/w
			 * know there are new descriptors to fetch.  (Only
			 * applicable for weak-ordered memory model archs,
			 * such as IA-64).
			 */
			wmb();
			if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
				e1000e_update_rdt_wa(rx_ring, i);
			else
				writel(i, rx_ring->tail);
		}
		i++;
		if (i == rx_ring->count)
			i = 0;
		buffer_info = &rx_ring->buffer_info[i];
	}

	rx_ring->next_to_use = i;
}

/**
 * e1000_alloc_rx_buffers_ps - Replace used receive buffers; packet split
 * @rx_ring: Rx descriptor ring
 **/
static void e1000_alloc_rx_buffers_ps(struct e1000_ring *rx_ring,
				      int cleaned_count, gfp_t gfp)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	union e1000_rx_desc_packet_split *rx_desc;
	struct e1000_buffer *buffer_info;
	struct e1000_ps_page *ps_page;
	struct sk_buff *skb;
	unsigned int i, j;

	i = rx_ring->next_to_use;
	buffer_info = &rx_ring->buffer_info[i];

	while (cleaned_count--) {
		rx_desc = E1000_RX_DESC_PS(*rx_ring, i);

		for (j = 0; j < PS_PAGE_BUFFERS; j++) {
			ps_page = &buffer_info->ps_pages[j];
			if (j >= adapter->rx_ps_pages) {
				/* all unused desc entries get hw null ptr */
				rx_desc->read.buffer_addr[j + 1] =
				    ~cpu_to_le64(0);
				continue;
			}
			if (!ps_page->page) {
				ps_page->page = alloc_page(gfp);
				if (!ps_page->page) {
					adapter->alloc_rx_buff_failed++;
					goto no_buffers;
				}
				ps_page->dma = dma_map_page(&pdev->dev,
							    ps_page->page,
							    0, PAGE_SIZE,
							    DMA_FROM_DEVICE);
				if (dma_mapping_error(&pdev->dev,
						      ps_page->dma)) {
					dev_err(&adapter->pdev->dev,
						"Rx DMA page map failed\n");
					adapter->rx_dma_failed++;
					goto no_buffers;
				}
			}
			/* Refresh the desc even if buffer_addrs
			 * didn't change because each write-back
			 * erases this info.
			 */
			rx_desc->read.buffer_addr[j + 1] =
			    cpu_to_le64(ps_page->dma);
		}

		skb = __netdev_alloc_skb_ip_align(netdev,
						  adapter->rx_ps_bsize0,
						  gfp);

		if (!skb) {
			adapter->alloc_rx_buff_failed++;
			break;
		}

		buffer_info->skb = skb;
		buffer_info->dma = dma_map_single(&pdev->dev, skb->data,
						  adapter->rx_ps_bsize0,
						  DMA_FROM_DEVICE);
		if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
			dev_err(&pdev->dev, "Rx DMA map failed\n");
			adapter->rx_dma_failed++;
			/* cleanup skb */
			dev_kfree_skb_any(skb);
			buffer_info->skb = NULL;
			break;
		}

		rx_desc->read.buffer_addr[0] = cpu_to_le64(buffer_info->dma);

		if (unlikely(!(i & (E1000_RX_BUFFER_WRITE - 1)))) {
			/* Force memory writes to complete before letting h/w
			 * know there are new descriptors to fetch.  (Only
			 * applicable for weak-ordered memory model archs,
			 * such as IA-64).
			 */
			wmb();
			if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
				e1000e_update_rdt_wa(rx_ring, i << 1);
			else
				writel(i << 1, rx_ring->tail);
		}

		i++;
		if (i == rx_ring->count)
			i = 0;
		buffer_info = &rx_ring->buffer_info[i];
	}

no_buffers:
	rx_ring->next_to_use = i;
}

/**
 * e1000_alloc_jumbo_rx_buffers - Replace used jumbo receive buffers
 * @rx_ring: Rx descriptor ring
 * @cleaned_count: number of buffers to allocate this pass
 **/

static void e1000_alloc_jumbo_rx_buffers(struct e1000_ring *rx_ring,
					 int cleaned_count, gfp_t gfp)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	union e1000_rx_desc_extended *rx_desc;
	struct e1000_buffer *buffer_info;
	struct sk_buff *skb;
	unsigned int i;
	unsigned int bufsz = 256 - 16;	/* for skb_reserve */

	i = rx_ring->next_to_use;
	buffer_info = &rx_ring->buffer_info[i];

	while (cleaned_count--) {
		skb = buffer_info->skb;
		if (skb) {
			skb_trim(skb, 0);
			goto check_page;
		}

		skb = __netdev_alloc_skb_ip_align(netdev, bufsz, gfp);
		if (unlikely(!skb)) {
			/* Better luck next round */
			adapter->alloc_rx_buff_failed++;
			break;
		}

		buffer_info->skb = skb;
check_page:
		/* allocate a new page if necessary */
		if (!buffer_info->page) {
			buffer_info->page = alloc_page(gfp);
			if (unlikely(!buffer_info->page)) {
				adapter->alloc_rx_buff_failed++;
				break;
			}
		}

		if (!buffer_info->dma)
			buffer_info->dma = dma_map_page(&pdev->dev,
			                                buffer_info->page, 0,
			                                PAGE_SIZE,
							DMA_FROM_DEVICE);

		rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
		rx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);

		if (unlikely(++i == rx_ring->count))
			i = 0;
		buffer_info = &rx_ring->buffer_info[i];
	}

	if (likely(rx_ring->next_to_use != i)) {
		rx_ring->next_to_use = i;
		if (unlikely(i-- == 0))
			i = (rx_ring->count - 1);

		/* Force memory writes to complete before letting h/w
		 * know there are new descriptors to fetch.  (Only
		 * applicable for weak-ordered memory model archs,
		 * such as IA-64).
		 */
		wmb();
		if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
			e1000e_update_rdt_wa(rx_ring, i);
		else
			writel(i, rx_ring->tail);
	}
}

static inline void e1000_rx_hash(struct net_device *netdev, __le32 rss,
				 struct sk_buff *skb)
{
	if (netdev->features & NETIF_F_RXHASH)
		skb->rxhash = le32_to_cpu(rss);
}

/**
 * e1000_clean_rx_irq - Send received data up the network stack
 * @rx_ring: Rx descriptor ring
 *
 * the return value indicates whether actual cleaning was done, there
 * is no guarantee that everything was cleaned
 **/
static bool e1000_clean_rx_irq(struct e1000_ring *rx_ring, int *work_done,
			       int work_to_do)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	struct e1000_hw *hw = &adapter->hw;
	union e1000_rx_desc_extended *rx_desc, *next_rxd;
	struct e1000_buffer *buffer_info, *next_buffer;
	u32 length, staterr;
	unsigned int i;
	int cleaned_count = 0;
	bool cleaned = false;
	unsigned int total_rx_bytes = 0, total_rx_packets = 0;

	i = rx_ring->next_to_clean;
	rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
	staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
	buffer_info = &rx_ring->buffer_info[i];

	while (staterr & E1000_RXD_STAT_DD) {
		struct sk_buff *skb;

		if (*work_done >= work_to_do)
			break;
		(*work_done)++;
		rmb();	/* read descriptor and rx_buffer_info after status DD */

		skb = buffer_info->skb;
		buffer_info->skb = NULL;

		prefetch(skb->data - NET_IP_ALIGN);

		i++;
		if (i == rx_ring->count)
			i = 0;
		next_rxd = E1000_RX_DESC_EXT(*rx_ring, i);
		prefetch(next_rxd);

		next_buffer = &rx_ring->buffer_info[i];

		cleaned = true;
		cleaned_count++;
		dma_unmap_single(&pdev->dev,
				 buffer_info->dma,
				 adapter->rx_buffer_len,
				 DMA_FROM_DEVICE);
		buffer_info->dma = 0;

		length = le16_to_cpu(rx_desc->wb.upper.length);

		/* !EOP means multiple descriptors were used to store a single
		 * packet, if that's the case we need to toss it.  In fact, we
		 * need to toss every packet with the EOP bit clear and the
		 * next frame that _does_ have the EOP bit set, as it is by
		 * definition only a frame fragment
		 */
		if (unlikely(!(staterr & E1000_RXD_STAT_EOP)))
			adapter->flags2 |= FLAG2_IS_DISCARDING;

		if (adapter->flags2 & FLAG2_IS_DISCARDING) {
			/* All receives must fit into a single buffer */
			e_dbg("Receive packet consumed multiple buffers\n");
			/* recycle */
			buffer_info->skb = skb;
			if (staterr & E1000_RXD_STAT_EOP)
				adapter->flags2 &= ~FLAG2_IS_DISCARDING;
			goto next_desc;
		}

		if (unlikely((staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) &&
			     !(netdev->features & NETIF_F_RXALL))) {
			/* recycle */
			buffer_info->skb = skb;
			goto next_desc;
		}

		/* adjust length to remove Ethernet CRC */
		if (!(adapter->flags2 & FLAG2_CRC_STRIPPING)) {
			/* If configured to store CRC, don't subtract FCS,
			 * but keep the FCS bytes out of the total_rx_bytes
			 * counter
			 */
			if (netdev->features & NETIF_F_RXFCS)
				total_rx_bytes -= 4;
			else
				length -= 4;
		}

		total_rx_bytes += length;
		total_rx_packets++;

		/* code added for copybreak, this should improve
		 * performance for small packets with large amounts
		 * of reassembly being done in the stack
		 */
		if (length < copybreak) {
			struct sk_buff *new_skb =
			    netdev_alloc_skb_ip_align(netdev, length);
			if (new_skb) {
				skb_copy_to_linear_data_offset(new_skb,
							       -NET_IP_ALIGN,
							       (skb->data -
								NET_IP_ALIGN),
							       (length +
								NET_IP_ALIGN));
				/* save the skb in buffer_info as good */
				buffer_info->skb = skb;
				skb = new_skb;
			}
			/* else just continue with the old one */
		}
		/* end copybreak code */
		skb_put(skb, length);

		/* Receive Checksum Offload */
		e1000_rx_checksum(adapter, staterr, skb);

		e1000_rx_hash(netdev, rx_desc->wb.lower.hi_dword.rss, skb);

		e1000_receive_skb(adapter, netdev, skb, staterr,
				  rx_desc->wb.upper.vlan);

next_desc:
		rx_desc->wb.upper.status_error &= cpu_to_le32(~0xFF);

		/* return some buffers to hardware, one at a time is too slow */
		if (cleaned_count >= E1000_RX_BUFFER_WRITE) {
			adapter->alloc_rx_buf(rx_ring, cleaned_count,
					      GFP_ATOMIC);
			cleaned_count = 0;
		}

		/* use prefetched values */
		rx_desc = next_rxd;
		buffer_info = next_buffer;

		staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
	}
	rx_ring->next_to_clean = i;

	cleaned_count = e1000_desc_unused(rx_ring);
	if (cleaned_count)
		adapter->alloc_rx_buf(rx_ring, cleaned_count, GFP_ATOMIC);

	adapter->total_rx_bytes += total_rx_bytes;
	adapter->total_rx_packets += total_rx_packets;
	return cleaned;
}

static void e1000_put_txbuf(struct e1000_ring *tx_ring,
			    struct e1000_buffer *buffer_info)
{
	struct e1000_adapter *adapter = tx_ring->adapter;

	if (buffer_info->dma) {
		if (buffer_info->mapped_as_page)
			dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
				       buffer_info->length, DMA_TO_DEVICE);
		else
			dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
					 buffer_info->length, DMA_TO_DEVICE);
		buffer_info->dma = 0;
	}
	if (buffer_info->skb) {
		dev_kfree_skb_any(buffer_info->skb);
		buffer_info->skb = NULL;
	}
	buffer_info->time_stamp = 0;
}

static void e1000_print_hw_hang(struct work_struct *work)
{
	struct e1000_adapter *adapter = container_of(work,
	                                             struct e1000_adapter,
	                                             print_hang_task);
	struct net_device *netdev = adapter->netdev;
	struct e1000_ring *tx_ring = adapter->tx_ring;
	unsigned int i = tx_ring->next_to_clean;
	unsigned int eop = tx_ring->buffer_info[i].next_to_watch;
	struct e1000_tx_desc *eop_desc = E1000_TX_DESC(*tx_ring, eop);
	struct e1000_hw *hw = &adapter->hw;
	u16 phy_status, phy_1000t_status, phy_ext_status;
	u16 pci_status;

	if (test_bit(__E1000_DOWN, &adapter->state))
		return;

	if (!adapter->tx_hang_recheck &&
	    (adapter->flags2 & FLAG2_DMA_BURST)) {
		/* May be block on write-back, flush and detect again
		 * flush pending descriptor writebacks to memory
		 */
		ew32(TIDV, adapter->tx_int_delay | E1000_TIDV_FPD);
		/* execute the writes immediately */
		e1e_flush();
		/* Due to rare timing issues, write to TIDV again to ensure
		 * the write is successful
		 */
		ew32(TIDV, adapter->tx_int_delay | E1000_TIDV_FPD);
		/* execute the writes immediately */
		e1e_flush();
		adapter->tx_hang_recheck = true;
		return;
	}
	/* Real hang detected */
	adapter->tx_hang_recheck = false;
	netif_stop_queue(netdev);

	e1e_rphy(hw, PHY_STATUS, &phy_status);
	e1e_rphy(hw, PHY_1000T_STATUS, &phy_1000t_status);
	e1e_rphy(hw, PHY_EXT_STATUS, &phy_ext_status);

	pci_read_config_word(adapter->pdev, PCI_STATUS, &pci_status);

	/* detected Hardware unit hang */
	e_err("Detected Hardware Unit Hang:\n"
	      "  TDH                  <%x>\n"
	      "  TDT                  <%x>\n"
	      "  next_to_use          <%x>\n"
	      "  next_to_clean        <%x>\n"
	      "buffer_info[next_to_clean]:\n"
	      "  time_stamp           <%lx>\n"
	      "  next_to_watch        <%x>\n"
	      "  jiffies              <%lx>\n"
	      "  next_to_watch.status <%x>\n"
	      "MAC Status             <%x>\n"
	      "PHY Status             <%x>\n"
	      "PHY 1000BASE-T Status  <%x>\n"
	      "PHY Extended Status    <%x>\n"
	      "PCI Status             <%x>\n",
	      readl(tx_ring->head),
	      readl(tx_ring->tail),
	      tx_ring->next_to_use,
	      tx_ring->next_to_clean,
	      tx_ring->buffer_info[eop].time_stamp,
	      eop,
	      jiffies,
	      eop_desc->upper.fields.status,
	      er32(STATUS),
	      phy_status,
	      phy_1000t_status,
	      phy_ext_status,
	      pci_status);

	/* Suggest workaround for known h/w issue */
	if ((hw->mac.type == e1000_pchlan) && (er32(CTRL) & E1000_CTRL_TFCE))
		e_err("Try turning off Tx pause (flow control) via ethtool\n");
}

/**
 * e1000e_tx_hwtstamp_work - check for Tx time stamp
 * @work: pointer to work struct
 *
 * This work function polls the TSYNCTXCTL valid bit to determine when a
 * timestamp has been taken for the current stored skb.  The timestamp must
 * be for this skb because only one such packet is allowed in the queue.
 */
static void e1000e_tx_hwtstamp_work(struct work_struct *work)
{
	struct e1000_adapter *adapter = container_of(work, struct e1000_adapter,
						     tx_hwtstamp_work);
	struct e1000_hw *hw = &adapter->hw;

	if (!adapter->tx_hwtstamp_skb)
		return;

	if (er32(TSYNCTXCTL) & E1000_TSYNCTXCTL_VALID) {
		struct skb_shared_hwtstamps shhwtstamps;
		u64 txstmp;

		txstmp = er32(TXSTMPL);
		txstmp |= (u64)er32(TXSTMPH) << 32;

		e1000e_systim_to_hwtstamp(adapter, &shhwtstamps, txstmp);

		skb_tstamp_tx(adapter->tx_hwtstamp_skb, &shhwtstamps);
		dev_kfree_skb_any(adapter->tx_hwtstamp_skb);
		adapter->tx_hwtstamp_skb = NULL;
	} else {
		/* reschedule to check later */
		schedule_work(&adapter->tx_hwtstamp_work);
	}
}

/**
 * e1000_clean_tx_irq - Reclaim resources after transmit completes
 * @tx_ring: Tx descriptor ring
 *
 * the return value indicates whether actual cleaning was done, there
 * is no guarantee that everything was cleaned
 **/
static bool e1000_clean_tx_irq(struct e1000_ring *tx_ring)
{
	struct e1000_adapter *adapter = tx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	struct e1000_tx_desc *tx_desc, *eop_desc;
	struct e1000_buffer *buffer_info;
	unsigned int i, eop;
	unsigned int count = 0;
	unsigned int total_tx_bytes = 0, total_tx_packets = 0;
	unsigned int bytes_compl = 0, pkts_compl = 0;

	i = tx_ring->next_to_clean;
	eop = tx_ring->buffer_info[i].next_to_watch;
	eop_desc = E1000_TX_DESC(*tx_ring, eop);

	while ((eop_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) &&
	       (count < tx_ring->count)) {
		bool cleaned = false;
		rmb(); /* read buffer_info after eop_desc */
		for (; !cleaned; count++) {
			tx_desc = E1000_TX_DESC(*tx_ring, i);
			buffer_info = &tx_ring->buffer_info[i];
			cleaned = (i == eop);

			if (cleaned) {
				total_tx_packets += buffer_info->segs;
				total_tx_bytes += buffer_info->bytecount;
				if (buffer_info->skb) {
					bytes_compl += buffer_info->skb->len;
					pkts_compl++;
				}
			}

			e1000_put_txbuf(tx_ring, buffer_info);
			tx_desc->upper.data = 0;

			i++;
			if (i == tx_ring->count)
				i = 0;
		}

		if (i == tx_ring->next_to_use)
			break;
		eop = tx_ring->buffer_info[i].next_to_watch;
		eop_desc = E1000_TX_DESC(*tx_ring, eop);
	}

	tx_ring->next_to_clean = i;

	netdev_completed_queue(netdev, pkts_compl, bytes_compl);

#define TX_WAKE_THRESHOLD 32
	if (count && netif_carrier_ok(netdev) &&
	    e1000_desc_unused(tx_ring) >= TX_WAKE_THRESHOLD) {
		/* Make sure that anybody stopping the queue after this
		 * sees the new next_to_clean.
		 */
		smp_mb();

		if (netif_queue_stopped(netdev) &&
		    !(test_bit(__E1000_DOWN, &adapter->state))) {
			netif_wake_queue(netdev);
			++adapter->restart_queue;
		}
	}

	if (adapter->detect_tx_hung) {
		/* Detect a transmit hang in hardware, this serializes the
		 * check with the clearing of time_stamp and movement of i
		 */
		adapter->detect_tx_hung = false;
		if (tx_ring->buffer_info[i].time_stamp &&
		    time_after(jiffies, tx_ring->buffer_info[i].time_stamp
			       + (adapter->tx_timeout_factor * HZ)) &&
		    !(er32(STATUS) & E1000_STATUS_TXOFF))
			schedule_work(&adapter->print_hang_task);
		else
			adapter->tx_hang_recheck = false;
	}
	adapter->total_tx_bytes += total_tx_bytes;
	adapter->total_tx_packets += total_tx_packets;
	return count < tx_ring->count;
}

/**
 * e1000_clean_rx_irq_ps - Send received data up the network stack; packet split
 * @rx_ring: Rx descriptor ring
 *
 * the return value indicates whether actual cleaning was done, there
 * is no guarantee that everything was cleaned
 **/
static bool e1000_clean_rx_irq_ps(struct e1000_ring *rx_ring, int *work_done,
				  int work_to_do)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct e1000_hw *hw = &adapter->hw;
	union e1000_rx_desc_packet_split *rx_desc, *next_rxd;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	struct e1000_buffer *buffer_info, *next_buffer;
	struct e1000_ps_page *ps_page;
	struct sk_buff *skb;
	unsigned int i, j;
	u32 length, staterr;
	int cleaned_count = 0;
	bool cleaned = false;
	unsigned int total_rx_bytes = 0, total_rx_packets = 0;

	i = rx_ring->next_to_clean;
	rx_desc = E1000_RX_DESC_PS(*rx_ring, i);
	staterr = le32_to_cpu(rx_desc->wb.middle.status_error);
	buffer_info = &rx_ring->buffer_info[i];

	while (staterr & E1000_RXD_STAT_DD) {
		if (*work_done >= work_to_do)
			break;
		(*work_done)++;
		skb = buffer_info->skb;
		rmb();	/* read descriptor and rx_buffer_info after status DD */

		/* in the packet split case this is header only */
		prefetch(skb->data - NET_IP_ALIGN);

		i++;
		if (i == rx_ring->count)
			i = 0;
		next_rxd = E1000_RX_DESC_PS(*rx_ring, i);
		prefetch(next_rxd);

		next_buffer = &rx_ring->buffer_info[i];

		cleaned = true;
		cleaned_count++;
		dma_unmap_single(&pdev->dev, buffer_info->dma,
				 adapter->rx_ps_bsize0, DMA_FROM_DEVICE);
		buffer_info->dma = 0;

		/* see !EOP comment in other Rx routine */
		if (!(staterr & E1000_RXD_STAT_EOP))
			adapter->flags2 |= FLAG2_IS_DISCARDING;

		if (adapter->flags2 & FLAG2_IS_DISCARDING) {
			e_dbg("Packet Split buffers didn't pick up the full packet\n");
			dev_kfree_skb_irq(skb);
			if (staterr & E1000_RXD_STAT_EOP)
				adapter->flags2 &= ~FLAG2_IS_DISCARDING;
			goto next_desc;
		}

		if (unlikely((staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) &&
			     !(netdev->features & NETIF_F_RXALL))) {
			dev_kfree_skb_irq(skb);
			goto next_desc;
		}

		length = le16_to_cpu(rx_desc->wb.middle.length0);

		if (!length) {
			e_dbg("Last part of the packet spanning multiple descriptors\n");
			dev_kfree_skb_irq(skb);
			goto next_desc;
		}

		/* Good Receive */
		skb_put(skb, length);

		{
			/* this looks ugly, but it seems compiler issues make
			 * it more efficient than reusing j
			 */
			int l1 = le16_to_cpu(rx_desc->wb.upper.length[0]);

			/* page alloc/put takes too long and effects small
			 * packet throughput, so unsplit small packets and
			 * save the alloc/put only valid in softirq (napi)
			 * context to call kmap_*
			 */
			if (l1 && (l1 <= copybreak) &&
			    ((length + l1) <= adapter->rx_ps_bsize0)) {
				u8 *vaddr;

				ps_page = &buffer_info->ps_pages[0];

				/* there is no documentation about how to call
				 * kmap_atomic, so we can't hold the mapping
				 * very long
				 */
				dma_sync_single_for_cpu(&pdev->dev,
							ps_page->dma,
							PAGE_SIZE,
							DMA_FROM_DEVICE);
				vaddr = kmap_atomic(ps_page->page);
				memcpy(skb_tail_pointer(skb), vaddr, l1);
				kunmap_atomic(vaddr);
				dma_sync_single_for_device(&pdev->dev,
							   ps_page->dma,
							   PAGE_SIZE,
							   DMA_FROM_DEVICE);

				/* remove the CRC */
				if (!(adapter->flags2 & FLAG2_CRC_STRIPPING)) {
					if (!(netdev->features & NETIF_F_RXFCS))
						l1 -= 4;
				}

				skb_put(skb, l1);
				goto copydone;
			} /* if */
		}

		for (j = 0; j < PS_PAGE_BUFFERS; j++) {
			length = le16_to_cpu(rx_desc->wb.upper.length[j]);
			if (!length)
				break;

			ps_page = &buffer_info->ps_pages[j];
			dma_unmap_page(&pdev->dev, ps_page->dma, PAGE_SIZE,
				       DMA_FROM_DEVICE);
			ps_page->dma = 0;
			skb_fill_page_desc(skb, j, ps_page->page, 0, length);
			ps_page->page = NULL;
			skb->len += length;
			skb->data_len += length;
			skb->truesize += PAGE_SIZE;
		}

		/* strip the ethernet crc, problem is we're using pages now so
		 * this whole operation can get a little cpu intensive
		 */
		if (!(adapter->flags2 & FLAG2_CRC_STRIPPING)) {
			if (!(netdev->features & NETIF_F_RXFCS))
				pskb_trim(skb, skb->len - 4);
		}

copydone:
		total_rx_bytes += skb->len;
		total_rx_packets++;

		e1000_rx_checksum(adapter, staterr, skb);

		e1000_rx_hash(netdev, rx_desc->wb.lower.hi_dword.rss, skb);

		if (rx_desc->wb.upper.header_status &
			   cpu_to_le16(E1000_RXDPS_HDRSTAT_HDRSP))
			adapter->rx_hdr_split++;

		e1000_receive_skb(adapter, netdev, skb, staterr,
				  rx_desc->wb.middle.vlan);

next_desc:
		rx_desc->wb.middle.status_error &= cpu_to_le32(~0xFF);
		buffer_info->skb = NULL;

		/* return some buffers to hardware, one at a time is too slow */
		if (cleaned_count >= E1000_RX_BUFFER_WRITE) {
			adapter->alloc_rx_buf(rx_ring, cleaned_count,
					      GFP_ATOMIC);
			cleaned_count = 0;
		}

		/* use prefetched values */
		rx_desc = next_rxd;
		buffer_info = next_buffer;

		staterr = le32_to_cpu(rx_desc->wb.middle.status_error);
	}
	rx_ring->next_to_clean = i;

	cleaned_count = e1000_desc_unused(rx_ring);
	if (cleaned_count)
		adapter->alloc_rx_buf(rx_ring, cleaned_count, GFP_ATOMIC);

	adapter->total_rx_bytes += total_rx_bytes;
	adapter->total_rx_packets += total_rx_packets;
	return cleaned;
}

/**
 * e1000_consume_page - helper function
 **/
static void e1000_consume_page(struct e1000_buffer *bi, struct sk_buff *skb,
                               u16 length)
{
	bi->page = NULL;
	skb->len += length;
	skb->data_len += length;
	skb->truesize += PAGE_SIZE;
}

/**
 * e1000_clean_jumbo_rx_irq - Send received data up the network stack; legacy
 * @adapter: board private structure
 *
 * the return value indicates whether actual cleaning was done, there
 * is no guarantee that everything was cleaned
 **/
static bool e1000_clean_jumbo_rx_irq(struct e1000_ring *rx_ring, int *work_done,
				     int work_to_do)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	union e1000_rx_desc_extended *rx_desc, *next_rxd;
	struct e1000_buffer *buffer_info, *next_buffer;
	u32 length, staterr;
	unsigned int i;
	int cleaned_count = 0;
	bool cleaned = false;
	unsigned int total_rx_bytes=0, total_rx_packets=0;

	i = rx_ring->next_to_clean;
	rx_desc = E1000_RX_DESC_EXT(*rx_ring, i);
	staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
	buffer_info = &rx_ring->buffer_info[i];

	while (staterr & E1000_RXD_STAT_DD) {
		struct sk_buff *skb;

		if (*work_done >= work_to_do)
			break;
		(*work_done)++;
		rmb();	/* read descriptor and rx_buffer_info after status DD */

		skb = buffer_info->skb;
		buffer_info->skb = NULL;

		++i;
		if (i == rx_ring->count)
			i = 0;
		next_rxd = E1000_RX_DESC_EXT(*rx_ring, i);
		prefetch(next_rxd);

		next_buffer = &rx_ring->buffer_info[i];

		cleaned = true;
		cleaned_count++;
		dma_unmap_page(&pdev->dev, buffer_info->dma, PAGE_SIZE,
			       DMA_FROM_DEVICE);
		buffer_info->dma = 0;

		length = le16_to_cpu(rx_desc->wb.upper.length);

		/* errors is only valid for DD + EOP descriptors */
		if (unlikely((staterr & E1000_RXD_STAT_EOP) &&
			     ((staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) &&
			      !(netdev->features & NETIF_F_RXALL)))) {
			/* recycle both page and skb */
			buffer_info->skb = skb;
			/* an error means any chain goes out the window too */
			if (rx_ring->rx_skb_top)
				dev_kfree_skb_irq(rx_ring->rx_skb_top);
			rx_ring->rx_skb_top = NULL;
			goto next_desc;
		}

#define rxtop (rx_ring->rx_skb_top)
		if (!(staterr & E1000_RXD_STAT_EOP)) {
			/* this descriptor is only the beginning (or middle) */
			if (!rxtop) {
				/* this is the beginning of a chain */
				rxtop = skb;
				skb_fill_page_desc(rxtop, 0, buffer_info->page,
				                   0, length);
			} else {
				/* this is the middle of a chain */
				skb_fill_page_desc(rxtop,
				    skb_shinfo(rxtop)->nr_frags,
				    buffer_info->page, 0, length);
				/* re-use the skb, only consumed the page */
				buffer_info->skb = skb;
			}
			e1000_consume_page(buffer_info, rxtop, length);
			goto next_desc;
		} else {
			if (rxtop) {
				/* end of the chain */
				skb_fill_page_desc(rxtop,
				    skb_shinfo(rxtop)->nr_frags,
				    buffer_info->page, 0, length);
				/* re-use the current skb, we only consumed the
				 * page
				 */
				buffer_info->skb = skb;
				skb = rxtop;
				rxtop = NULL;
				e1000_consume_page(buffer_info, skb, length);
			} else {
				/* no chain, got EOP, this buf is the packet
				 * copybreak to save the put_page/alloc_page
				 */
				if (length <= copybreak &&
				    skb_tailroom(skb) >= length) {
					u8 *vaddr;
					vaddr = kmap_atomic(buffer_info->page);
					memcpy(skb_tail_pointer(skb), vaddr,
					       length);
					kunmap_atomic(vaddr);
					/* re-use the page, so don't erase
					 * buffer_info->page
					 */
					skb_put(skb, length);
				} else {
					skb_fill_page_desc(skb, 0,
					                   buffer_info->page, 0,
				                           length);
					e1000_consume_page(buffer_info, skb,
					                   length);
				}
			}
		}

		/* Receive Checksum Offload */
		e1000_rx_checksum(adapter, staterr, skb);

		e1000_rx_hash(netdev, rx_desc->wb.lower.hi_dword.rss, skb);

		/* probably a little skewed due to removing CRC */
		total_rx_bytes += skb->len;
		total_rx_packets++;

		/* eth type trans needs skb->data to point to something */
		if (!pskb_may_pull(skb, ETH_HLEN)) {
			e_err("pskb_may_pull failed.\n");
			dev_kfree_skb_irq(skb);
			goto next_desc;
		}

		e1000_receive_skb(adapter, netdev, skb, staterr,
				  rx_desc->wb.upper.vlan);

next_desc:
		rx_desc->wb.upper.status_error &= cpu_to_le32(~0xFF);

		/* return some buffers to hardware, one at a time is too slow */
		if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
			adapter->alloc_rx_buf(rx_ring, cleaned_count,
					      GFP_ATOMIC);
			cleaned_count = 0;
		}

		/* use prefetched values */
		rx_desc = next_rxd;
		buffer_info = next_buffer;

		staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
	}
	rx_ring->next_to_clean = i;

	cleaned_count = e1000_desc_unused(rx_ring);
	if (cleaned_count)
		adapter->alloc_rx_buf(rx_ring, cleaned_count, GFP_ATOMIC);

	adapter->total_rx_bytes += total_rx_bytes;
	adapter->total_rx_packets += total_rx_packets;
	return cleaned;
}

/**
 * e1000_clean_rx_ring - Free Rx Buffers per Queue
 * @rx_ring: Rx descriptor ring
 **/
static void e1000_clean_rx_ring(struct e1000_ring *rx_ring)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct e1000_buffer *buffer_info;
	struct e1000_ps_page *ps_page;
	struct pci_dev *pdev = adapter->pdev;
	unsigned int i, j;

	/* Free all the Rx ring sk_buffs */
	for (i = 0; i < rx_ring->count; i++) {
		buffer_info = &rx_ring->buffer_info[i];
		if (buffer_info->dma) {
			if (adapter->clean_rx == e1000_clean_rx_irq)
				dma_unmap_single(&pdev->dev, buffer_info->dma,
						 adapter->rx_buffer_len,
						 DMA_FROM_DEVICE);
			else if (adapter->clean_rx == e1000_clean_jumbo_rx_irq)
				dma_unmap_page(&pdev->dev, buffer_info->dma,
				               PAGE_SIZE,
					       DMA_FROM_DEVICE);
			else if (adapter->clean_rx == e1000_clean_rx_irq_ps)
				dma_unmap_single(&pdev->dev, buffer_info->dma,
						 adapter->rx_ps_bsize0,
						 DMA_FROM_DEVICE);
			buffer_info->dma = 0;
		}

		if (buffer_info->page) {
			put_page(buffer_info->page);
			buffer_info->page = NULL;
		}

		if (buffer_info->skb) {
			dev_kfree_skb(buffer_info->skb);
			buffer_info->skb = NULL;
		}

		for (j = 0; j < PS_PAGE_BUFFERS; j++) {
			ps_page = &buffer_info->ps_pages[j];
			if (!ps_page->page)
				break;
			dma_unmap_page(&pdev->dev, ps_page->dma, PAGE_SIZE,
				       DMA_FROM_DEVICE);
			ps_page->dma = 0;
			put_page(ps_page->page);
			ps_page->page = NULL;
		}
	}

	/* there also may be some cached data from a chained receive */
	if (rx_ring->rx_skb_top) {
		dev_kfree_skb(rx_ring->rx_skb_top);
		rx_ring->rx_skb_top = NULL;
	}

	/* Zero out the descriptor ring */
	memset(rx_ring->desc, 0, rx_ring->size);

	rx_ring->next_to_clean = 0;
	rx_ring->next_to_use = 0;
	adapter->flags2 &= ~FLAG2_IS_DISCARDING;

	writel(0, rx_ring->head);
	if (rx_ring->adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
		e1000e_update_rdt_wa(rx_ring, 0);
	else
		writel(0, rx_ring->tail);
}

static void e1000e_downshift_workaround(struct work_struct *work)
{
	struct e1000_adapter *adapter = container_of(work,
					struct e1000_adapter, downshift_task);

	if (test_bit(__E1000_DOWN, &adapter->state))
		return;

	e1000e_gig_downshift_workaround_ich8lan(&adapter->hw);
}

/**
 * e1000_intr_msi - Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 **/
static irqreturn_t e1000_intr_msi(int irq, void *data)
{
	struct net_device *netdev = data;
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u32 icr = er32(ICR);

	/* read ICR disables interrupts using IAM */
	if (icr & E1000_ICR_LSC) {
		hw->mac.get_link_status = true;
		/* ICH8 workaround-- Call gig speed drop workaround on cable
		 * disconnect (LSC) before accessing any PHY registers
		 */
		if ((adapter->flags & FLAG_LSC_GIG_SPEED_DROP) &&
		    (!(er32(STATUS) & E1000_STATUS_LU)))
			schedule_work(&adapter->downshift_task);

		/* 80003ES2LAN workaround-- For packet buffer work-around on
		 * link down event; disable receives here in the ISR and reset
		 * adapter in watchdog
		 */
		if (netif_carrier_ok(netdev) &&
		    adapter->flags & FLAG_RX_NEEDS_RESTART) {
			/* disable receives */
			u32 rctl = er32(RCTL);
			ew32(RCTL, rctl & ~E1000_RCTL_EN);
			adapter->flags |= FLAG_RESTART_NOW;
		}
		/* guard against interrupt when we're going down */
		if (!test_bit(__E1000_DOWN, &adapter->state))
			mod_timer(&adapter->watchdog_timer, jiffies + 1);
	}

	/* Reset on uncorrectable ECC error */
	if ((icr & E1000_ICR_ECCER) && (hw->mac.type == e1000_pch_lpt)) {
		u32 pbeccsts = er32(PBECCSTS);

		adapter->corr_errors +=
		    pbeccsts & E1000_PBECCSTS_CORR_ERR_CNT_MASK;
		adapter->uncorr_errors +=
		    (pbeccsts & E1000_PBECCSTS_UNCORR_ERR_CNT_MASK) >>
		    E1000_PBECCSTS_UNCORR_ERR_CNT_SHIFT;

		/* Do the reset outside of interrupt context */
		schedule_work(&adapter->reset_task);

		/* return immediately since reset is imminent */
		return IRQ_HANDLED;
	}

	if (napi_schedule_prep(&adapter->napi)) {
		adapter->total_tx_bytes = 0;
		adapter->total_tx_packets = 0;
		adapter->total_rx_bytes = 0;
		adapter->total_rx_packets = 0;
		__napi_schedule(&adapter->napi);
	}

	return IRQ_HANDLED;
}

/**
 * e1000_intr - Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 **/
static irqreturn_t e1000_intr(int irq, void *data)
{
	struct net_device *netdev = data;
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u32 rctl, icr = er32(ICR);

	if (!icr || test_bit(__E1000_DOWN, &adapter->state))
		return IRQ_NONE;  /* Not our interrupt */

	/* IMS will not auto-mask if INT_ASSERTED is not set, and if it is
	 * not set, then the adapter didn't send an interrupt
	 */
	if (!(icr & E1000_ICR_INT_ASSERTED))
		return IRQ_NONE;

	/* Interrupt Auto-Mask...upon reading ICR,
	 * interrupts are masked.  No need for the
	 * IMC write
	 */

	if (icr & E1000_ICR_LSC) {
		hw->mac.get_link_status = true;
		/* ICH8 workaround-- Call gig speed drop workaround on cable
		 * disconnect (LSC) before accessing any PHY registers
		 */
		if ((adapter->flags & FLAG_LSC_GIG_SPEED_DROP) &&
		    (!(er32(STATUS) & E1000_STATUS_LU)))
			schedule_work(&adapter->downshift_task);

		/* 80003ES2LAN workaround--
		 * For packet buffer work-around on link down event;
		 * disable receives here in the ISR and
		 * reset adapter in watchdog
		 */
		if (netif_carrier_ok(netdev) &&
		    (adapter->flags & FLAG_RX_NEEDS_RESTART)) {
			/* disable receives */
			rctl = er32(RCTL);
			ew32(RCTL, rctl & ~E1000_RCTL_EN);
			adapter->flags |= FLAG_RESTART_NOW;
		}
		/* guard against interrupt when we're going down */
		if (!test_bit(__E1000_DOWN, &adapter->state))
			mod_timer(&adapter->watchdog_timer, jiffies + 1);
	}

	/* Reset on uncorrectable ECC error */
	if ((icr & E1000_ICR_ECCER) && (hw->mac.type == e1000_pch_lpt)) {
		u32 pbeccsts = er32(PBECCSTS);

		adapter->corr_errors +=
		    pbeccsts & E1000_PBECCSTS_CORR_ERR_CNT_MASK;
		adapter->uncorr_errors +=
		    (pbeccsts & E1000_PBECCSTS_UNCORR_ERR_CNT_MASK) >>
		    E1000_PBECCSTS_UNCORR_ERR_CNT_SHIFT;

		/* Do the reset outside of interrupt context */
		schedule_work(&adapter->reset_task);

		/* return immediately since reset is imminent */
		return IRQ_HANDLED;
	}

	if (napi_schedule_prep(&adapter->napi)) {
		adapter->total_tx_bytes = 0;
		adapter->total_tx_packets = 0;
		adapter->total_rx_bytes = 0;
		adapter->total_rx_packets = 0;
		__napi_schedule(&adapter->napi);
	}

	return IRQ_HANDLED;
}

static irqreturn_t e1000_msix_other(int irq, void *data)
{
	struct net_device *netdev = data;
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u32 icr = er32(ICR);

	if (!(icr & E1000_ICR_INT_ASSERTED)) {
		if (!test_bit(__E1000_DOWN, &adapter->state))
			ew32(IMS, E1000_IMS_OTHER);
		return IRQ_NONE;
	}

	if (icr & adapter->eiac_mask)
		ew32(ICS, (icr & adapter->eiac_mask));

	if (icr & E1000_ICR_OTHER) {
		if (!(icr & E1000_ICR_LSC))
			goto no_link_interrupt;
		hw->mac.get_link_status = true;
		/* guard against interrupt when we're going down */
		if (!test_bit(__E1000_DOWN, &adapter->state))
			mod_timer(&adapter->watchdog_timer, jiffies + 1);
	}

no_link_interrupt:
	if (!test_bit(__E1000_DOWN, &adapter->state))
		ew32(IMS, E1000_IMS_LSC | E1000_IMS_OTHER);

	return IRQ_HANDLED;
}


static irqreturn_t e1000_intr_msix_tx(int irq, void *data)
{
	struct net_device *netdev = data;
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	struct e1000_ring *tx_ring = adapter->tx_ring;


	adapter->total_tx_bytes = 0;
	adapter->total_tx_packets = 0;

	if (!e1000_clean_tx_irq(tx_ring))
		/* Ring was not completely cleaned, so fire another interrupt */
		ew32(ICS, tx_ring->ims_val);

	return IRQ_HANDLED;
}

static irqreturn_t e1000_intr_msix_rx(int irq, void *data)
{
	struct net_device *netdev = data;
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_ring *rx_ring = adapter->rx_ring;

	/* Write the ITR value calculated at the end of the
	 * previous interrupt.
	 */
	if (rx_ring->set_itr) {
		writel(1000000000 / (rx_ring->itr_val * 256),
		       rx_ring->itr_register);
		rx_ring->set_itr = 0;
	}

	if (napi_schedule_prep(&adapter->napi)) {
		adapter->total_rx_bytes = 0;
		adapter->total_rx_packets = 0;
		__napi_schedule(&adapter->napi);
	}
	return IRQ_HANDLED;
}

/**
 * e1000_configure_msix - Configure MSI-X hardware
 *
 * e1000_configure_msix sets up the hardware to properly
 * generate MSI-X interrupts.
 **/
static void e1000_configure_msix(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	struct e1000_ring *rx_ring = adapter->rx_ring;
	struct e1000_ring *tx_ring = adapter->tx_ring;
	int vector = 0;
	u32 ctrl_ext, ivar = 0;

	adapter->eiac_mask = 0;

	/* Workaround issue with spurious interrupts on 82574 in MSI-X mode */
	if (hw->mac.type == e1000_82574) {
		u32 rfctl = er32(RFCTL);
		rfctl |= E1000_RFCTL_ACK_DIS;
		ew32(RFCTL, rfctl);
	}

#define E1000_IVAR_INT_ALLOC_VALID	0x8
	/* Configure Rx vector */
	rx_ring->ims_val = E1000_IMS_RXQ0;
	adapter->eiac_mask |= rx_ring->ims_val;
	if (rx_ring->itr_val)
		writel(1000000000 / (rx_ring->itr_val * 256),
		       rx_ring->itr_register);
	else
		writel(1, rx_ring->itr_register);
	ivar = E1000_IVAR_INT_ALLOC_VALID | vector;

	/* Configure Tx vector */
	tx_ring->ims_val = E1000_IMS_TXQ0;
	vector++;
	if (tx_ring->itr_val)
		writel(1000000000 / (tx_ring->itr_val * 256),
		       tx_ring->itr_register);
	else
		writel(1, tx_ring->itr_register);
	adapter->eiac_mask |= tx_ring->ims_val;
	ivar |= ((E1000_IVAR_INT_ALLOC_VALID | vector) << 8);

	/* set vector for Other Causes, e.g. link changes */
	vector++;
	ivar |= ((E1000_IVAR_INT_ALLOC_VALID | vector) << 16);
	if (rx_ring->itr_val)
		writel(1000000000 / (rx_ring->itr_val * 256),
		       hw->hw_addr + E1000_EITR_82574(vector));
	else
		writel(1, hw->hw_addr + E1000_EITR_82574(vector));

	/* Cause Tx interrupts on every write back */
	ivar |= (1 << 31);

	ew32(IVAR, ivar);

	/* enable MSI-X PBA support */
	ctrl_ext = er32(CTRL_EXT);
	ctrl_ext |= E1000_CTRL_EXT_PBA_CLR;

	/* Auto-Mask Other interrupts upon ICR read */
#define E1000_EIAC_MASK_82574   0x01F00000
	ew32(IAM, ~E1000_EIAC_MASK_82574 | E1000_IMS_OTHER);
	ctrl_ext |= E1000_CTRL_EXT_EIAME;
	ew32(CTRL_EXT, ctrl_ext);
	e1e_flush();
}

void e1000e_reset_interrupt_capability(struct e1000_adapter *adapter)
{
	if (adapter->msix_entries) {
		pci_disable_msix(adapter->pdev);
		kfree(adapter->msix_entries);
		adapter->msix_entries = NULL;
	} else if (adapter->flags & FLAG_MSI_ENABLED) {
		pci_disable_msi(adapter->pdev);
		adapter->flags &= ~FLAG_MSI_ENABLED;
	}
}

/**
 * e1000e_set_interrupt_capability - set MSI or MSI-X if supported
 *
 * Attempt to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
void e1000e_set_interrupt_capability(struct e1000_adapter *adapter)
{
	int err;
	int i;

	switch (adapter->int_mode) {
	case E1000E_INT_MODE_MSIX:
		if (adapter->flags & FLAG_HAS_MSIX) {
			adapter->num_vectors = 3; /* RxQ0, TxQ0 and other */
			adapter->msix_entries = kcalloc(adapter->num_vectors,
						      sizeof(struct msix_entry),
						      GFP_KERNEL);
			if (adapter->msix_entries) {
				for (i = 0; i < adapter->num_vectors; i++)
					adapter->msix_entries[i].entry = i;

				err = pci_enable_msix(adapter->pdev,
						      adapter->msix_entries,
						      adapter->num_vectors);
				if (err == 0)
					return;
			}
			/* MSI-X failed, so fall through and try MSI */
			e_err("Failed to initialize MSI-X interrupts.  Falling back to MSI interrupts.\n");
			e1000e_reset_interrupt_capability(adapter);
		}
		adapter->int_mode = E1000E_INT_MODE_MSI;
		/* Fall through */
	case E1000E_INT_MODE_MSI:
		if (!pci_enable_msi(adapter->pdev)) {
			adapter->flags |= FLAG_MSI_ENABLED;
		} else {
			adapter->int_mode = E1000E_INT_MODE_LEGACY;
			e_err("Failed to initialize MSI interrupts.  Falling back to legacy interrupts.\n");
		}
		/* Fall through */
	case E1000E_INT_MODE_LEGACY:
		/* Don't do anything; this is the system default */
		break;
	}

	/* store the number of vectors being used */
	adapter->num_vectors = 1;
}

/**
 * e1000_request_msix - Initialize MSI-X interrupts
 *
 * e1000_request_msix allocates MSI-X vectors and requests interrupts from the
 * kernel.
 **/
static int e1000_request_msix(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int err = 0, vector = 0;

	if (strlen(netdev->name) < (IFNAMSIZ - 5))
		snprintf(adapter->rx_ring->name,
			 sizeof(adapter->rx_ring->name) - 1,
			 "%s-rx-0", netdev->name);
	else
		memcpy(adapter->rx_ring->name, netdev->name, IFNAMSIZ);
	err = request_irq(adapter->msix_entries[vector].vector,
			  e1000_intr_msix_rx, 0, adapter->rx_ring->name,
			  netdev);
	if (err)
		return err;
	adapter->rx_ring->itr_register = adapter->hw.hw_addr +
	    E1000_EITR_82574(vector);
	adapter->rx_ring->itr_val = adapter->itr;
	vector++;

	if (strlen(netdev->name) < (IFNAMSIZ - 5))
		snprintf(adapter->tx_ring->name,
			 sizeof(adapter->tx_ring->name) - 1,
			 "%s-tx-0", netdev->name);
	else
		memcpy(adapter->tx_ring->name, netdev->name, IFNAMSIZ);
	err = request_irq(adapter->msix_entries[vector].vector,
			  e1000_intr_msix_tx, 0, adapter->tx_ring->name,
			  netdev);
	if (err)
		return err;
	adapter->tx_ring->itr_register = adapter->hw.hw_addr +
	    E1000_EITR_82574(vector);
	adapter->tx_ring->itr_val = adapter->itr;
	vector++;

	err = request_irq(adapter->msix_entries[vector].vector,
			  e1000_msix_other, 0, netdev->name, netdev);
	if (err)
		return err;

	e1000_configure_msix(adapter);

	return 0;
}

/**
 * e1000_request_irq - initialize interrupts
 *
 * Attempts to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
static int e1000_request_irq(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int err;

	if (adapter->msix_entries) {
		err = e1000_request_msix(adapter);
		if (!err)
			return err;
		/* fall back to MSI */
		e1000e_reset_interrupt_capability(adapter);
		adapter->int_mode = E1000E_INT_MODE_MSI;
		e1000e_set_interrupt_capability(adapter);
	}
	if (adapter->flags & FLAG_MSI_ENABLED) {
		err = request_irq(adapter->pdev->irq, e1000_intr_msi, 0,
				  netdev->name, netdev);
		if (!err)
			return err;

		/* fall back to legacy interrupt */
		e1000e_reset_interrupt_capability(adapter);
		adapter->int_mode = E1000E_INT_MODE_LEGACY;
	}

	err = request_irq(adapter->pdev->irq, e1000_intr, IRQF_SHARED,
			  netdev->name, netdev);
	if (err)
		e_err("Unable to allocate interrupt, Error: %d\n", err);

	return err;
}

static void e1000_free_irq(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;

	if (adapter->msix_entries) {
		int vector = 0;

		free_irq(adapter->msix_entries[vector].vector, netdev);
		vector++;

		free_irq(adapter->msix_entries[vector].vector, netdev);
		vector++;

		/* Other Causes interrupt vector */
		free_irq(adapter->msix_entries[vector].vector, netdev);
		return;
	}

	free_irq(adapter->pdev->irq, netdev);
}

/**
 * e1000_irq_disable - Mask off interrupt generation on the NIC
 **/
static void e1000_irq_disable(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;

	ew32(IMC, ~0);
	if (adapter->msix_entries)
		ew32(EIAC_82574, 0);
	e1e_flush();

	if (adapter->msix_entries) {
		int i;
		for (i = 0; i < adapter->num_vectors; i++)
			synchronize_irq(adapter->msix_entries[i].vector);
	} else {
		synchronize_irq(adapter->pdev->irq);
	}
}

/**
 * e1000_irq_enable - Enable default interrupt generation settings
 **/
static void e1000_irq_enable(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;

	if (adapter->msix_entries) {
		ew32(EIAC_82574, adapter->eiac_mask & E1000_EIAC_MASK_82574);
		ew32(IMS, adapter->eiac_mask | E1000_IMS_OTHER | E1000_IMS_LSC);
	} else if (hw->mac.type == e1000_pch_lpt) {
		ew32(IMS, IMS_ENABLE_MASK | E1000_IMS_ECCER);
	} else {
		ew32(IMS, IMS_ENABLE_MASK);
	}
	e1e_flush();
}

/**
 * e1000e_get_hw_control - get control of the h/w from f/w
 * @adapter: address of board private structure
 *
 * e1000e_get_hw_control sets {CTRL_EXT|SWSM}:DRV_LOAD bit.
 * For ASF and Pass Through versions of f/w this means that
 * the driver is loaded. For AMT version (only with 82573)
 * of the f/w this means that the network i/f is open.
 **/
void e1000e_get_hw_control(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 ctrl_ext;
	u32 swsm;

	/* Let firmware know the driver has taken over */
	if (adapter->flags & FLAG_HAS_SWSM_ON_LOAD) {
		swsm = er32(SWSM);
		ew32(SWSM, swsm | E1000_SWSM_DRV_LOAD);
	} else if (adapter->flags & FLAG_HAS_CTRLEXT_ON_LOAD) {
		ctrl_ext = er32(CTRL_EXT);
		ew32(CTRL_EXT, ctrl_ext | E1000_CTRL_EXT_DRV_LOAD);
	}
}

/**
 * e1000e_release_hw_control - release control of the h/w to f/w
 * @adapter: address of board private structure
 *
 * e1000e_release_hw_control resets {CTRL_EXT|SWSM}:DRV_LOAD bit.
 * For ASF and Pass Through versions of f/w this means that the
 * driver is no longer loaded. For AMT version (only with 82573) i
 * of the f/w this means that the network i/f is closed.
 *
 **/
void e1000e_release_hw_control(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 ctrl_ext;
	u32 swsm;

	/* Let firmware taken over control of h/w */
	if (adapter->flags & FLAG_HAS_SWSM_ON_LOAD) {
		swsm = er32(SWSM);
		ew32(SWSM, swsm & ~E1000_SWSM_DRV_LOAD);
	} else if (adapter->flags & FLAG_HAS_CTRLEXT_ON_LOAD) {
		ctrl_ext = er32(CTRL_EXT);
		ew32(CTRL_EXT, ctrl_ext & ~E1000_CTRL_EXT_DRV_LOAD);
	}
}

/**
 * e1000_alloc_ring_dma - allocate memory for a ring structure
 **/
static int e1000_alloc_ring_dma(struct e1000_adapter *adapter,
				struct e1000_ring *ring)
{
	struct pci_dev *pdev = adapter->pdev;

	ring->desc = dma_alloc_coherent(&pdev->dev, ring->size, &ring->dma,
					GFP_KERNEL);
	if (!ring->desc)
		return -ENOMEM;

	return 0;
}

/**
 * e1000e_setup_tx_resources - allocate Tx resources (Descriptors)
 * @tx_ring: Tx descriptor ring
 *
 * Return 0 on success, negative on failure
 **/
int e1000e_setup_tx_resources(struct e1000_ring *tx_ring)
{
	struct e1000_adapter *adapter = tx_ring->adapter;
	int err = -ENOMEM, size;

	size = sizeof(struct e1000_buffer) * tx_ring->count;
	tx_ring->buffer_info = vzalloc(size);
	if (!tx_ring->buffer_info)
		goto err;

	/* round up to nearest 4K */
	tx_ring->size = tx_ring->count * sizeof(struct e1000_tx_desc);
	tx_ring->size = ALIGN(tx_ring->size, 4096);

	err = e1000_alloc_ring_dma(adapter, tx_ring);
	if (err)
		goto err;

	tx_ring->next_to_use = 0;
	tx_ring->next_to_clean = 0;

	return 0;
err:
	vfree(tx_ring->buffer_info);
	e_err("Unable to allocate memory for the transmit descriptor ring\n");
	return err;
}

/**
 * e1000e_setup_rx_resources - allocate Rx resources (Descriptors)
 * @rx_ring: Rx descriptor ring
 *
 * Returns 0 on success, negative on failure
 **/
int e1000e_setup_rx_resources(struct e1000_ring *rx_ring)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct e1000_buffer *buffer_info;
	int i, size, desc_len, err = -ENOMEM;

	size = sizeof(struct e1000_buffer) * rx_ring->count;
	rx_ring->buffer_info = vzalloc(size);
	if (!rx_ring->buffer_info)
		goto err;

	for (i = 0; i < rx_ring->count; i++) {
		buffer_info = &rx_ring->buffer_info[i];
		buffer_info->ps_pages = kcalloc(PS_PAGE_BUFFERS,
						sizeof(struct e1000_ps_page),
						GFP_KERNEL);
		if (!buffer_info->ps_pages)
			goto err_pages;
	}

	desc_len = sizeof(union e1000_rx_desc_packet_split);

	/* Round up to nearest 4K */
	rx_ring->size = rx_ring->count * desc_len;
	rx_ring->size = ALIGN(rx_ring->size, 4096);

	err = e1000_alloc_ring_dma(adapter, rx_ring);
	if (err)
		goto err_pages;

	rx_ring->next_to_clean = 0;
	rx_ring->next_to_use = 0;
	rx_ring->rx_skb_top = NULL;

	return 0;

err_pages:
	for (i = 0; i < rx_ring->count; i++) {
		buffer_info = &rx_ring->buffer_info[i];
		kfree(buffer_info->ps_pages);
	}
err:
	vfree(rx_ring->buffer_info);
	e_err("Unable to allocate memory for the receive descriptor ring\n");
	return err;
}

/**
 * e1000_clean_tx_ring - Free Tx Buffers
 * @tx_ring: Tx descriptor ring
 **/
static void e1000_clean_tx_ring(struct e1000_ring *tx_ring)
{
	struct e1000_adapter *adapter = tx_ring->adapter;
	struct e1000_buffer *buffer_info;
	unsigned long size;
	unsigned int i;

	for (i = 0; i < tx_ring->count; i++) {
		buffer_info = &tx_ring->buffer_info[i];
		e1000_put_txbuf(tx_ring, buffer_info);
	}

	netdev_reset_queue(adapter->netdev);
	size = sizeof(struct e1000_buffer) * tx_ring->count;
	memset(tx_ring->buffer_info, 0, size);

	memset(tx_ring->desc, 0, tx_ring->size);

	tx_ring->next_to_use = 0;
	tx_ring->next_to_clean = 0;

	writel(0, tx_ring->head);
	if (tx_ring->adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
		e1000e_update_tdt_wa(tx_ring, 0);
	else
		writel(0, tx_ring->tail);
}

/**
 * e1000e_free_tx_resources - Free Tx Resources per Queue
 * @tx_ring: Tx descriptor ring
 *
 * Free all transmit software resources
 **/
void e1000e_free_tx_resources(struct e1000_ring *tx_ring)
{
	struct e1000_adapter *adapter = tx_ring->adapter;
	struct pci_dev *pdev = adapter->pdev;

	e1000_clean_tx_ring(tx_ring);

	vfree(tx_ring->buffer_info);
	tx_ring->buffer_info = NULL;

	dma_free_coherent(&pdev->dev, tx_ring->size, tx_ring->desc,
			  tx_ring->dma);
	tx_ring->desc = NULL;
}

/**
 * e1000e_free_rx_resources - Free Rx Resources
 * @rx_ring: Rx descriptor ring
 *
 * Free all receive software resources
 **/
void e1000e_free_rx_resources(struct e1000_ring *rx_ring)
{
	struct e1000_adapter *adapter = rx_ring->adapter;
	struct pci_dev *pdev = adapter->pdev;
	int i;

	e1000_clean_rx_ring(rx_ring);

	for (i = 0; i < rx_ring->count; i++)
		kfree(rx_ring->buffer_info[i].ps_pages);

	vfree(rx_ring->buffer_info);
	rx_ring->buffer_info = NULL;

	dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
			  rx_ring->dma);
	rx_ring->desc = NULL;
}

/**
 * e1000_update_itr - update the dynamic ITR value based on statistics
 * @adapter: pointer to adapter
 * @itr_setting: current adapter->itr
 * @packets: the number of packets during this measurement interval
 * @bytes: the number of bytes during this measurement interval
 *
 *      Stores a new ITR value based on packets and byte
 *      counts during the last interrupt.  The advantage of per interrupt
 *      computation is faster updates and more accurate ITR for the current
 *      traffic pattern.  Constants in this function were computed
 *      based on theoretical maximum wire speed and thresholds were set based
 *      on testing data as well as attempting to minimize response time
 *      while increasing bulk throughput.  This functionality is controlled
 *      by the InterruptThrottleRate module parameter.
 **/
static unsigned int e1000_update_itr(struct e1000_adapter *adapter,
				     u16 itr_setting, int packets,
				     int bytes)
{
	unsigned int retval = itr_setting;

	if (packets == 0)
		return itr_setting;

	switch (itr_setting) {
	case lowest_latency:
		/* handle TSO and jumbo frames */
		if (bytes/packets > 8000)
			retval = bulk_latency;
		else if ((packets < 5) && (bytes > 512))
			retval = low_latency;
		break;
	case low_latency:  /* 50 usec aka 20000 ints/s */
		if (bytes > 10000) {
			/* this if handles the TSO accounting */
			if (bytes/packets > 8000)
				retval = bulk_latency;
			else if ((packets < 10) || ((bytes/packets) > 1200))
				retval = bulk_latency;
			else if ((packets > 35))
				retval = lowest_latency;
		} else if (bytes/packets > 2000) {
			retval = bulk_latency;
		} else if (packets <= 2 && bytes < 512) {
			retval = lowest_latency;
		}
		break;
	case bulk_latency: /* 250 usec aka 4000 ints/s */
		if (bytes > 25000) {
			if (packets > 35)
				retval = low_latency;
		} else if (bytes < 6000) {
			retval = low_latency;
		}
		break;
	}

	return retval;
}

static void e1000_set_itr(struct e1000_adapter *adapter)
{
	u16 current_itr;
	u32 new_itr = adapter->itr;

	/* for non-gigabit speeds, just fix the interrupt rate at 4000 */
	if (adapter->link_speed != SPEED_1000) {
		current_itr = 0;
		new_itr = 4000;
		goto set_itr_now;
	}

	if (adapter->flags2 & FLAG2_DISABLE_AIM) {
		new_itr = 0;
		goto set_itr_now;
	}

	adapter->tx_itr = e1000_update_itr(adapter,
				    adapter->tx_itr,
				    adapter->total_tx_packets,
				    adapter->total_tx_bytes);
	/* conservative mode (itr 3) eliminates the lowest_latency setting */
	if (adapter->itr_setting == 3 && adapter->tx_itr == lowest_latency)
		adapter->tx_itr = low_latency;

	adapter->rx_itr = e1000_update_itr(adapter,
				    adapter->rx_itr,
				    adapter->total_rx_packets,
				    adapter->total_rx_bytes);
	/* conservative mode (itr 3) eliminates the lowest_latency setting */
	if (adapter->itr_setting == 3 && adapter->rx_itr == lowest_latency)
		adapter->rx_itr = low_latency;

	current_itr = max(adapter->rx_itr, adapter->tx_itr);

	switch (current_itr) {
	/* counts and packets in update_itr are dependent on these numbers */
	case lowest_latency:
		new_itr = 70000;
		break;
	case low_latency:
		new_itr = 20000; /* aka hwitr = ~200 */
		break;
	case bulk_latency:
		new_itr = 4000;
		break;
	default:
		break;
	}

set_itr_now:
	if (new_itr != adapter->itr) {
		/* this attempts to bias the interrupt rate towards Bulk
		 * by adding intermediate steps when interrupt rate is
		 * increasing
		 */
		new_itr = new_itr > adapter->itr ?
			     min(adapter->itr + (new_itr >> 2), new_itr) :
			     new_itr;
		adapter->itr = new_itr;
		adapter->rx_ring->itr_val = new_itr;
		if (adapter->msix_entries)
			adapter->rx_ring->set_itr = 1;
		else
			e1000e_write_itr(adapter, new_itr);
	}
}

/**
 * e1000e_write_itr - write the ITR value to the appropriate registers
 * @adapter: address of board private structure
 * @itr: new ITR value to program
 *
 * e1000e_write_itr determines if the adapter is in MSI-X mode
 * and, if so, writes the EITR registers with the ITR value.
 * Otherwise, it writes the ITR value into the ITR register.
 **/
void e1000e_write_itr(struct e1000_adapter *adapter, u32 itr)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 new_itr = itr ? 1000000000 / (itr * 256) : 0;

	if (adapter->msix_entries) {
		int vector;

		for (vector = 0; vector < adapter->num_vectors; vector++)
			writel(new_itr, hw->hw_addr + E1000_EITR_82574(vector));
	} else {
		ew32(ITR, new_itr);
	}
}

/**
 * e1000_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 **/
static int e1000_alloc_queues(struct e1000_adapter *adapter)
{
	int size = sizeof(struct e1000_ring);

	adapter->tx_ring = kzalloc(size, GFP_KERNEL);
	if (!adapter->tx_ring)
		goto err;
	adapter->tx_ring->count = adapter->tx_ring_count;
	adapter->tx_ring->adapter = adapter;

	adapter->rx_ring = kzalloc(size, GFP_KERNEL);
	if (!adapter->rx_ring)
		goto err;
	adapter->rx_ring->count = adapter->rx_ring_count;
	adapter->rx_ring->adapter = adapter;

	return 0;
err:
	e_err("Unable to allocate memory for queues\n");
	kfree(adapter->rx_ring);
	kfree(adapter->tx_ring);
	return -ENOMEM;
}

/**
 * e1000e_poll - NAPI Rx polling callback
 * @napi: struct associated with this polling callback
 * @weight: number of packets driver is allowed to process this poll
 **/
static int e1000e_poll(struct napi_struct *napi, int weight)
{
	struct e1000_adapter *adapter = container_of(napi, struct e1000_adapter,
						     napi);
	struct e1000_hw *hw = &adapter->hw;
	struct net_device *poll_dev = adapter->netdev;
	int tx_cleaned = 1, work_done = 0;

	adapter = netdev_priv(poll_dev);

	if (!adapter->msix_entries ||
	    (adapter->rx_ring->ims_val & adapter->tx_ring->ims_val))
		tx_cleaned = e1000_clean_tx_irq(adapter->tx_ring);

	adapter->clean_rx(adapter->rx_ring, &work_done, weight);

	if (!tx_cleaned)
		work_done = weight;

	/* If weight not fully consumed, exit the polling mode */
	if (work_done < weight) {
		if (adapter->itr_setting & 3)
			e1000_set_itr(adapter);
		napi_complete(napi);
		if (!test_bit(__E1000_DOWN, &adapter->state)) {
			if (adapter->msix_entries)
				ew32(IMS, adapter->rx_ring->ims_val);
			else
				e1000_irq_enable(adapter);
		}
	}

	return work_done;
}

static int e1000_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u32 vfta, index;

	/* don't update vlan cookie if already programmed */
	if ((adapter->hw.mng_cookie.status &
	     E1000_MNG_DHCP_COOKIE_STATUS_VLAN) &&
	    (vid == adapter->mng_vlan_id))
		return 0;

	/* add VID to filter table */
	if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER) {
		index = (vid >> 5) & 0x7F;
		vfta = E1000_READ_REG_ARRAY(hw, E1000_VFTA, index);
		vfta |= (1 << (vid & 0x1F));
		hw->mac.ops.write_vfta(hw, index, vfta);
	}

	set_bit(vid, adapter->active_vlans);

	return 0;
}

static int e1000_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u32 vfta, index;

	if ((adapter->hw.mng_cookie.status &
	     E1000_MNG_DHCP_COOKIE_STATUS_VLAN) &&
	    (vid == adapter->mng_vlan_id)) {
		/* release control to f/w */
		e1000e_release_hw_control(adapter);
		return 0;
	}

	/* remove VID from filter table */
	if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER) {
		index = (vid >> 5) & 0x7F;
		vfta = E1000_READ_REG_ARRAY(hw, E1000_VFTA, index);
		vfta &= ~(1 << (vid & 0x1F));
		hw->mac.ops.write_vfta(hw, index, vfta);
	}

	clear_bit(vid, adapter->active_vlans);

	return 0;
}

/**
 * e1000e_vlan_filter_disable - helper to disable hw VLAN filtering
 * @adapter: board private structure to initialize
 **/
static void e1000e_vlan_filter_disable(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	u32 rctl;

	if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER) {
		/* disable VLAN receive filtering */
		rctl = er32(RCTL);
		rctl &= ~(E1000_RCTL_VFE | E1000_RCTL_CFIEN);
		ew32(RCTL, rctl);

		if (adapter->mng_vlan_id != (u16)E1000_MNG_VLAN_NONE) {
			e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
			adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
		}
	}
}

/**
 * e1000e_vlan_filter_enable - helper to enable HW VLAN filtering
 * @adapter: board private structure to initialize
 **/
static void e1000e_vlan_filter_enable(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 rctl;

	if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER) {
		/* enable VLAN receive filtering */
		rctl = er32(RCTL);
		rctl |= E1000_RCTL_VFE;
		rctl &= ~E1000_RCTL_CFIEN;
		ew32(RCTL, rctl);
	}
}

/**
 * e1000e_vlan_strip_enable - helper to disable HW VLAN stripping
 * @adapter: board private structure to initialize
 **/
static void e1000e_vlan_strip_disable(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 ctrl;

	/* disable VLAN tag insert/strip */
	ctrl = er32(CTRL);
	ctrl &= ~E1000_CTRL_VME;
	ew32(CTRL, ctrl);
}

/**
 * e1000e_vlan_strip_enable - helper to enable HW VLAN stripping
 * @adapter: board private structure to initialize
 **/
static void e1000e_vlan_strip_enable(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 ctrl;

	/* enable VLAN tag insert/strip */
	ctrl = er32(CTRL);
	ctrl |= E1000_CTRL_VME;
	ew32(CTRL, ctrl);
}

static void e1000_update_mng_vlan(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	u16 vid = adapter->hw.mng_cookie.vlan_id;
	u16 old_vid = adapter->mng_vlan_id;

	if (adapter->hw.mng_cookie.status &
	    E1000_MNG_DHCP_COOKIE_STATUS_VLAN) {
		e1000_vlan_rx_add_vid(netdev, vid);
		adapter->mng_vlan_id = vid;
	}

	if ((old_vid != (u16)E1000_MNG_VLAN_NONE) && (vid != old_vid))
		e1000_vlan_rx_kill_vid(netdev, old_vid);
}

static void e1000_restore_vlan(struct e1000_adapter *adapter)
{
	u16 vid;

	e1000_vlan_rx_add_vid(adapter->netdev, 0);

	for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
		e1000_vlan_rx_add_vid(adapter->netdev, vid);
}

static void e1000_init_manageability_pt(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 manc, manc2h, mdef, i, j;

	if (!(adapter->flags & FLAG_MNG_PT_ENABLED))
		return;

	manc = er32(MANC);

	/* enable receiving management packets to the host. this will probably
	 * generate destination unreachable messages from the host OS, but
	 * the packets will be handled on SMBUS
	 */
	manc |= E1000_MANC_EN_MNG2HOST;
	manc2h = er32(MANC2H);

	switch (hw->mac.type) {
	default:
		manc2h |= (E1000_MANC2H_PORT_623 | E1000_MANC2H_PORT_664);
		break;
	case e1000_82574:
	case e1000_82583:
		/* Check if IPMI pass-through decision filter already exists;
		 * if so, enable it.
		 */
		for (i = 0, j = 0; i < 8; i++) {
			mdef = er32(MDEF(i));

			/* Ignore filters with anything other than IPMI ports */
			if (mdef & ~(E1000_MDEF_PORT_623 | E1000_MDEF_PORT_664))
				continue;

			/* Enable this decision filter in MANC2H */
			if (mdef)
				manc2h |= (1 << i);

			j |= mdef;
		}

		if (j == (E1000_MDEF_PORT_623 | E1000_MDEF_PORT_664))
			break;

		/* Create new decision filter in an empty filter */
		for (i = 0, j = 0; i < 8; i++)
			if (er32(MDEF(i)) == 0) {
				ew32(MDEF(i), (E1000_MDEF_PORT_623 |
					       E1000_MDEF_PORT_664));
				manc2h |= (1 << 1);
				j++;
				break;
			}

		if (!j)
			e_warn("Unable to create IPMI pass-through filter\n");
		break;
	}

	ew32(MANC2H, manc2h);
	ew32(MANC, manc);
}

/**
 * e1000_configure_tx - Configure Transmit Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/
static void e1000_configure_tx(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	struct e1000_ring *tx_ring = adapter->tx_ring;
	u64 tdba;
	u32 tdlen, tarc;

	/* Setup the HW Tx Head and Tail descriptor pointers */
	tdba = tx_ring->dma;
	tdlen = tx_ring->count * sizeof(struct e1000_tx_desc);
	ew32(TDBAL(0), (tdba & DMA_BIT_MASK(32)));
	ew32(TDBAH(0), (tdba >> 32));
	ew32(TDLEN(0), tdlen);
	ew32(TDH(0), 0);
	ew32(TDT(0), 0);
	tx_ring->head = adapter->hw.hw_addr + E1000_TDH(0);
	tx_ring->tail = adapter->hw.hw_addr + E1000_TDT(0);

	/* Set the Tx Interrupt Delay register */
	ew32(TIDV, adapter->tx_int_delay);
	/* Tx irq moderation */
	ew32(TADV, adapter->tx_abs_int_delay);

	if (adapter->flags2 & FLAG2_DMA_BURST) {
		u32 txdctl = er32(TXDCTL(0));
		txdctl &= ~(E1000_TXDCTL_PTHRESH | E1000_TXDCTL_HTHRESH |
			    E1000_TXDCTL_WTHRESH);
		/* set up some performance related parameters to encourage the
		 * hardware to use the bus more efficiently in bursts, depends
		 * on the tx_int_delay to be enabled,
		 * wthresh = 1 ==> burst write is disabled to avoid Tx stalls
		 * hthresh = 1 ==> prefetch when one or more available
		 * pthresh = 0x1f ==> prefetch if internal cache 31 or less
		 * BEWARE: this seems to work but should be considered first if
		 * there are Tx hangs or other Tx related bugs
		 */
		txdctl |= E1000_TXDCTL_DMA_BURST_ENABLE;
		ew32(TXDCTL(0), txdctl);
	}
	/* erratum work around: set txdctl the same for both queues */
	ew32(TXDCTL(1), er32(TXDCTL(0)));

	if (adapter->flags & FLAG_TARC_SPEED_MODE_BIT) {
		tarc = er32(TARC(0));
		/* set the speed mode bit, we'll clear it if we're not at
		 * gigabit link later
		 */
#define SPEED_MODE_BIT (1 << 21)
		tarc |= SPEED_MODE_BIT;
		ew32(TARC(0), tarc);
	}

	/* errata: program both queues to unweighted RR */
	if (adapter->flags & FLAG_TARC_SET_BIT_ZERO) {
		tarc = er32(TARC(0));
		tarc |= 1;
		ew32(TARC(0), tarc);
		tarc = er32(TARC(1));
		tarc |= 1;
		ew32(TARC(1), tarc);
	}

	/* Setup Transmit Descriptor Settings for eop descriptor */
	adapter->txd_cmd = E1000_TXD_CMD_EOP | E1000_TXD_CMD_IFCS;

	/* only set IDE if we are delaying interrupts using the timers */
	if (adapter->tx_int_delay)
		adapter->txd_cmd |= E1000_TXD_CMD_IDE;

	/* enable Report Status bit */
	adapter->txd_cmd |= E1000_TXD_CMD_RS;

	hw->mac.ops.config_collision_dist(hw);
}

/**
 * e1000_setup_rctl - configure the receive control registers
 * @adapter: Board private structure
 **/
#define PAGE_USE_COUNT(S) (((S) >> PAGE_SHIFT) + \
			   (((S) & (PAGE_SIZE - 1)) ? 1 : 0))
static void e1000_setup_rctl(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 rctl, rfctl;
	u32 pages = 0;

	/* Workaround Si errata on PCHx - configure jumbo frame flow */
	if (hw->mac.type >= e1000_pch2lan) {
		s32 ret_val;

		if (adapter->netdev->mtu > ETH_DATA_LEN)
			ret_val = e1000_lv_jumbo_workaround_ich8lan(hw, true);
		else
			ret_val = e1000_lv_jumbo_workaround_ich8lan(hw, false);

		if (ret_val)
			e_dbg("failed to enable jumbo frame workaround mode\n");
	}

	/* Program MC offset vector base */
	rctl = er32(RCTL);
	rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
	rctl |= E1000_RCTL_EN | E1000_RCTL_BAM |
		E1000_RCTL_LBM_NO | E1000_RCTL_RDMTS_HALF |
		(adapter->hw.mac.mc_filter_type << E1000_RCTL_MO_SHIFT);

	/* Do not Store bad packets */
	rctl &= ~E1000_RCTL_SBP;

	/* Enable Long Packet receive */
	if (adapter->netdev->mtu <= ETH_DATA_LEN)
		rctl &= ~E1000_RCTL_LPE;
	else
		rctl |= E1000_RCTL_LPE;

	/* Some systems expect that the CRC is included in SMBUS traffic. The
	 * hardware strips the CRC before sending to both SMBUS (BMC) and to
	 * host memory when this is enabled
	 */
	if (adapter->flags2 & FLAG2_CRC_STRIPPING)
		rctl |= E1000_RCTL_SECRC;

	/* Workaround Si errata on 82577 PHY - configure IPG for jumbos */
	if ((hw->phy.type == e1000_phy_82577) && (rctl & E1000_RCTL_LPE)) {
		u16 phy_data;

		e1e_rphy(hw, PHY_REG(770, 26), &phy_data);
		phy_data &= 0xfff8;
		phy_data |= (1 << 2);
		e1e_wphy(hw, PHY_REG(770, 26), phy_data);

		e1e_rphy(hw, 22, &phy_data);
		phy_data &= 0x0fff;
		phy_data |= (1 << 14);
		e1e_wphy(hw, 0x10, 0x2823);
		e1e_wphy(hw, 0x11, 0x0003);
		e1e_wphy(hw, 22, phy_data);
	}

	/* Setup buffer sizes */
	rctl &= ~E1000_RCTL_SZ_4096;
	rctl |= E1000_RCTL_BSEX;
	switch (adapter->rx_buffer_len) {
	case 2048:
	default:
		rctl |= E1000_RCTL_SZ_2048;
		rctl &= ~E1000_RCTL_BSEX;
		break;
	case 4096:
		rctl |= E1000_RCTL_SZ_4096;
		break;
	case 8192:
		rctl |= E1000_RCTL_SZ_8192;
		break;
	case 16384:
		rctl |= E1000_RCTL_SZ_16384;
		break;
	}

	/* Enable Extended Status in all Receive Descriptors */
	rfctl = er32(RFCTL);
	rfctl |= E1000_RFCTL_EXTEN;
	ew32(RFCTL, rfctl);

	/* 82571 and greater support packet-split where the protocol
	 * header is placed in skb->data and the packet data is
	 * placed in pages hanging off of skb_shinfo(skb)->nr_frags.
	 * In the case of a non-split, skb->data is linearly filled,
	 * followed by the page buffers.  Therefore, skb->data is
	 * sized to hold the largest protocol header.
	 *
	 * allocations using alloc_page take too long for regular MTU
	 * so only enable packet split for jumbo frames
	 *
	 * Using pages when the page size is greater than 16k wastes
	 * a lot of memory, since we allocate 3 pages at all times
	 * per packet.
	 */
	pages = PAGE_USE_COUNT(adapter->netdev->mtu);
	if ((pages <= 3) && (PAGE_SIZE <= 16384) && (rctl & E1000_RCTL_LPE))
		adapter->rx_ps_pages = pages;
	else
		adapter->rx_ps_pages = 0;

	if (adapter->rx_ps_pages) {
		u32 psrctl = 0;

		/* Enable Packet split descriptors */
		rctl |= E1000_RCTL_DTYP_PS;

		psrctl |= adapter->rx_ps_bsize0 >>
			E1000_PSRCTL_BSIZE0_SHIFT;

		switch (adapter->rx_ps_pages) {
		case 3:
			psrctl |= PAGE_SIZE <<
				E1000_PSRCTL_BSIZE3_SHIFT;
		case 2:
			psrctl |= PAGE_SIZE <<
				E1000_PSRCTL_BSIZE2_SHIFT;
		case 1:
			psrctl |= PAGE_SIZE >>
				E1000_PSRCTL_BSIZE1_SHIFT;
			break;
		}

		ew32(PSRCTL, psrctl);
	}

	/* This is useful for sniffing bad packets. */
	if (adapter->netdev->features & NETIF_F_RXALL) {
		/* UPE and MPE will be handled by normal PROMISC logic
		 * in e1000e_set_rx_mode
		 */
		rctl |= (E1000_RCTL_SBP | /* Receive bad packets */
			 E1000_RCTL_BAM | /* RX All Bcast Pkts */
			 E1000_RCTL_PMCF); /* RX All MAC Ctrl Pkts */

		rctl &= ~(E1000_RCTL_VFE | /* Disable VLAN filter */
			  E1000_RCTL_DPF | /* Allow filtered pause */
			  E1000_RCTL_CFIEN); /* Dis VLAN CFIEN Filter */
		/* Do not mess with E1000_CTRL_VME, it affects transmit as well,
		 * and that breaks VLANs.
		 */
	}

	ew32(RCTL, rctl);
	/* just started the receive unit, no need to restart */
	adapter->flags &= ~FLAG_RESTART_NOW;
}

/**
 * e1000_configure_rx - Configure Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/
static void e1000_configure_rx(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	struct e1000_ring *rx_ring = adapter->rx_ring;
	u64 rdba;
	u32 rdlen, rctl, rxcsum, ctrl_ext;

	if (adapter->rx_ps_pages) {
		/* this is a 32 byte descriptor */
		rdlen = rx_ring->count *
		    sizeof(union e1000_rx_desc_packet_split);
		adapter->clean_rx = e1000_clean_rx_irq_ps;
		adapter->alloc_rx_buf = e1000_alloc_rx_buffers_ps;
	} else if (adapter->netdev->mtu > ETH_FRAME_LEN + ETH_FCS_LEN) {
		rdlen = rx_ring->count * sizeof(union e1000_rx_desc_extended);
		adapter->clean_rx = e1000_clean_jumbo_rx_irq;
		adapter->alloc_rx_buf = e1000_alloc_jumbo_rx_buffers;
	} else {
		rdlen = rx_ring->count * sizeof(union e1000_rx_desc_extended);
		adapter->clean_rx = e1000_clean_rx_irq;
		adapter->alloc_rx_buf = e1000_alloc_rx_buffers;
	}

	/* disable receives while setting up the descriptors */
	rctl = er32(RCTL);
	if (!(adapter->flags2 & FLAG2_NO_DISABLE_RX))
		ew32(RCTL, rctl & ~E1000_RCTL_EN);
	e1e_flush();
	usleep_range(10000, 20000);

	if (adapter->flags2 & FLAG2_DMA_BURST) {
		/* set the writeback threshold (only takes effect if the RDTR
		 * is set). set GRAN=1 and write back up to 0x4 worth, and
		 * enable prefetching of 0x20 Rx descriptors
		 * granularity = 01
		 * wthresh = 04,
		 * hthresh = 04,
		 * pthresh = 0x20
		 */
		ew32(RXDCTL(0), E1000_RXDCTL_DMA_BURST_ENABLE);
		ew32(RXDCTL(1), E1000_RXDCTL_DMA_BURST_ENABLE);

		/* override the delay timers for enabling bursting, only if
		 * the value was not set by the user via module options
		 */
		if (adapter->rx_int_delay == DEFAULT_RDTR)
			adapter->rx_int_delay = BURST_RDTR;
		if (adapter->rx_abs_int_delay == DEFAULT_RADV)
			adapter->rx_abs_int_delay = BURST_RADV;
	}

	/* set the Receive Delay Timer Register */
	ew32(RDTR, adapter->rx_int_delay);

	/* irq moderation */
	ew32(RADV, adapter->rx_abs_int_delay);
	if ((adapter->itr_setting != 0) && (adapter->itr != 0))
		e1000e_write_itr(adapter, adapter->itr);

	ctrl_ext = er32(CTRL_EXT);
	/* Auto-Mask interrupts upon ICR access */
	ctrl_ext |= E1000_CTRL_EXT_IAME;
	ew32(IAM, 0xffffffff);
	ew32(CTRL_EXT, ctrl_ext);
	e1e_flush();

	/* Setup the HW Rx Head and Tail Descriptor Pointers and
	 * the Base and Length of the Rx Descriptor Ring
	 */
	rdba = rx_ring->dma;
	ew32(RDBAL(0), (rdba & DMA_BIT_MASK(32)));
	ew32(RDBAH(0), (rdba >> 32));
	ew32(RDLEN(0), rdlen);
	ew32(RDH(0), 0);
	ew32(RDT(0), 0);
	rx_ring->head = adapter->hw.hw_addr + E1000_RDH(0);
	rx_ring->tail = adapter->hw.hw_addr + E1000_RDT(0);

	/* Enable Receive Checksum Offload for TCP and UDP */
	rxcsum = er32(RXCSUM);
	if (adapter->netdev->features & NETIF_F_RXCSUM)
		rxcsum |= E1000_RXCSUM_TUOFL;
	else
		rxcsum &= ~E1000_RXCSUM_TUOFL;
	ew32(RXCSUM, rxcsum);

	/* With jumbo frames, excessive C-state transition latencies result
	 * in dropped transactions.
	 */
	if (adapter->netdev->mtu > ETH_DATA_LEN) {
		u32 lat =
		    ((er32(PBA) & E1000_PBA_RXA_MASK) * 1024 -
		     adapter->max_frame_size) * 8 / 1000;

		if (adapter->flags & FLAG_IS_ICH) {
			u32 rxdctl = er32(RXDCTL(0));
			ew32(RXDCTL(0), rxdctl | 0x3);
		}

		pm_qos_update_request(&adapter->netdev->pm_qos_req, lat);
	} else {
		pm_qos_update_request(&adapter->netdev->pm_qos_req,
				      PM_QOS_DEFAULT_VALUE);
	}

	/* Enable Receives */
	ew32(RCTL, rctl);
}

/**
 * e1000e_write_mc_addr_list - write multicast addresses to MTA
 * @netdev: network interface device structure
 *
 * Writes multicast address list to the MTA hash table.
 * Returns: -ENOMEM on failure
 *                0 on no addresses written
 *                X on writing X addresses to MTA
 */
static int e1000e_write_mc_addr_list(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	struct netdev_hw_addr *ha;
	u8 *mta_list;
	int i;

	if (netdev_mc_empty(netdev)) {
		/* nothing to program, so clear mc list */
		hw->mac.ops.update_mc_addr_list(hw, NULL, 0);
		return 0;
	}

	mta_list = kzalloc(netdev_mc_count(netdev) * ETH_ALEN, GFP_ATOMIC);
	if (!mta_list)
		return -ENOMEM;

	/* update_mc_addr_list expects a packed array of only addresses. */
	i = 0;
	netdev_for_each_mc_addr(ha, netdev)
		memcpy(mta_list + (i++ * ETH_ALEN), ha->addr, ETH_ALEN);

	hw->mac.ops.update_mc_addr_list(hw, mta_list, i);
	kfree(mta_list);

	return netdev_mc_count(netdev);
}

/**
 * e1000e_write_uc_addr_list - write unicast addresses to RAR table
 * @netdev: network interface device structure
 *
 * Writes unicast address list to the RAR table.
 * Returns: -ENOMEM on failure/insufficient address space
 *                0 on no addresses written
 *                X on writing X addresses to the RAR table
 **/
static int e1000e_write_uc_addr_list(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	unsigned int rar_entries = hw->mac.rar_entry_count;
	int count = 0;

	/* save a rar entry for our hardware address */
	rar_entries--;

	/* save a rar entry for the LAA workaround */
	if (adapter->flags & FLAG_RESET_OVERWRITES_LAA)
		rar_entries--;

	/* return ENOMEM indicating insufficient memory for addresses */
	if (netdev_uc_count(netdev) > rar_entries)
		return -ENOMEM;

	if (!netdev_uc_empty(netdev) && rar_entries) {
		struct netdev_hw_addr *ha;

		/* write the addresses in reverse order to avoid write
		 * combining
		 */
		netdev_for_each_uc_addr(ha, netdev) {
			if (!rar_entries)
				break;
			hw->mac.ops.rar_set(hw, ha->addr, rar_entries--);
			count++;
		}
	}

	/* zero out the remaining RAR entries not used above */
	for (; rar_entries > 0; rar_entries--) {
		ew32(RAH(rar_entries), 0);
		ew32(RAL(rar_entries), 0);
	}
	e1e_flush();

	return count;
}

/**
 * e1000e_set_rx_mode - secondary unicast, Multicast and Promiscuous mode set
 * @netdev: network interface device structure
 *
 * The ndo_set_rx_mode entry point is called whenever the unicast or multicast
 * address list or the network interface flags are updated.  This routine is
 * responsible for configuring the hardware for proper unicast, multicast,
 * promiscuous mode, and all-multi behavior.
 **/
static void e1000e_set_rx_mode(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u32 rctl;

	/* Check for Promiscuous and All Multicast modes */
	rctl = er32(RCTL);

	/* clear the affected bits */
	rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);

	if (netdev->flags & IFF_PROMISC) {
		rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
		/* Do not hardware filter VLANs in promisc mode */
		e1000e_vlan_filter_disable(adapter);
	} else {
		int count;

		if (netdev->flags & IFF_ALLMULTI) {
			rctl |= E1000_RCTL_MPE;
		} else {
			/* Write addresses to the MTA, if the attempt fails
			 * then we should just turn on promiscuous mode so
			 * that we can at least receive multicast traffic
			 */
			count = e1000e_write_mc_addr_list(netdev);
			if (count < 0)
				rctl |= E1000_RCTL_MPE;
		}
		e1000e_vlan_filter_enable(adapter);
		/* Write addresses to available RAR registers, if there is not
		 * sufficient space to store all the addresses then enable
		 * unicast promiscuous mode
		 */
		count = e1000e_write_uc_addr_list(netdev);
		if (count < 0)
			rctl |= E1000_RCTL_UPE;
	}

	ew32(RCTL, rctl);

	if (netdev->features & NETIF_F_HW_VLAN_RX)
		e1000e_vlan_strip_enable(adapter);
	else
		e1000e_vlan_strip_disable(adapter);
}

static void e1000e_setup_rss_hash(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 mrqc, rxcsum;
	int i;
	static const u32 rsskey[10] = {
		0xda565a6d, 0xc20e5b25, 0x3d256741, 0xb08fa343, 0xcb2bcad0,
		0xb4307bae, 0xa32dcb77, 0x0cf23080, 0x3bb7426a, 0xfa01acbe
	};

	/* Fill out hash function seed */
	for (i = 0; i < 10; i++)
		ew32(RSSRK(i), rsskey[i]);

	/* Direct all traffic to queue 0 */
	for (i = 0; i < 32; i++)
		ew32(RETA(i), 0);

	/* Disable raw packet checksumming so that RSS hash is placed in
	 * descriptor on writeback.
	 */
	rxcsum = er32(RXCSUM);
	rxcsum |= E1000_RXCSUM_PCSD;

	ew32(RXCSUM, rxcsum);

	mrqc = (E1000_MRQC_RSS_FIELD_IPV4 |
		E1000_MRQC_RSS_FIELD_IPV4_TCP |
		E1000_MRQC_RSS_FIELD_IPV6 |
		E1000_MRQC_RSS_FIELD_IPV6_TCP |
		E1000_MRQC_RSS_FIELD_IPV6_TCP_EX);

	ew32(MRQC, mrqc);
}

/**
 * e1000e_get_base_timinca - get default SYSTIM time increment attributes
 * @adapter: board private structure
 * @timinca: pointer to returned time increment attributes
 *
 * Get attributes for incrementing the System Time Register SYSTIML/H at
 * the default base frequency, and set the cyclecounter shift value.
 **/
s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 incvalue, incperiod, shift;

	/* Make sure clock is enabled on I217 before checking the frequency */
	if ((hw->mac.type == e1000_pch_lpt) &&
	    !(er32(TSYNCTXCTL) & E1000_TSYNCTXCTL_ENABLED) &&
	    !(er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_ENABLED)) {
		u32 fextnvm7 = er32(FEXTNVM7);

		if (!(fextnvm7 & (1 << 0))) {
			ew32(FEXTNVM7, fextnvm7 | (1 << 0));
			e1e_flush();
		}
	}

	switch (hw->mac.type) {
	case e1000_pch2lan:
	case e1000_pch_lpt:
		/* On I217, the clock frequency is 25MHz or 96MHz as
		 * indicated by the System Clock Frequency Indication
		 */
		if ((hw->mac.type != e1000_pch_lpt) ||
		    (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI)) {
			/* Stable 96MHz frequency */
			incperiod = INCPERIOD_96MHz;
			incvalue = INCVALUE_96MHz;
			shift = INCVALUE_SHIFT_96MHz;
			adapter->cc.shift = shift + INCPERIOD_SHIFT_96MHz;
			break;
		}
		/* fall-through */
	case e1000_82574:
	case e1000_82583:
		/* Stable 25MHz frequency */
		incperiod = INCPERIOD_25MHz;
		incvalue = INCVALUE_25MHz;
		shift = INCVALUE_SHIFT_25MHz;
		adapter->cc.shift = shift;
		break;
	default:
		return -EINVAL;
	}

	*timinca = ((incperiod << E1000_TIMINCA_INCPERIOD_SHIFT) |
		    ((incvalue << shift) & E1000_TIMINCA_INCVALUE_MASK));

	return 0;
}

/**
 * e1000e_config_hwtstamp - configure the hwtstamp registers and enable/disable
 * @adapter: board private structure
 *
 * Outgoing time stamping can be enabled and disabled. Play nice and
 * disable it when requested, although it shouldn't cause any overhead
 * when no packet needs it. At most one packet in the queue may be
 * marked for time stamping, otherwise it would be impossible to tell
 * for sure to which packet the hardware time stamp belongs.
 *
 * Incoming time stamping has to be configured via the hardware filters.
 * Not all combinations are supported, in particular event type has to be
 * specified. Matching the kind of event packet is not supported, with the
 * exception of "all V2 events regardless of level 2 or 4".
 **/
static int e1000e_config_hwtstamp(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	struct hwtstamp_config *config = &adapter->hwtstamp_config;
	u32 tsync_tx_ctl = E1000_TSYNCTXCTL_ENABLED;
	u32 tsync_rx_ctl = E1000_TSYNCRXCTL_ENABLED;
	u32 rxmtrl = 0;
	u16 rxudp = 0;
	bool is_l4 = false;
	bool is_l2 = false;
	u32 regval;
	s32 ret_val;

	if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP))
		return -EINVAL;

	/* flags reserved for future extensions - must be zero */
	if (config->flags)
		return -EINVAL;

	switch (config->tx_type) {
	case HWTSTAMP_TX_OFF:
		tsync_tx_ctl = 0;
		break;
	case HWTSTAMP_TX_ON:
		break;
	default:
		return -ERANGE;
	}

	switch (config->rx_filter) {
	case HWTSTAMP_FILTER_NONE:
		tsync_rx_ctl = 0;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
		tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
		rxmtrl = E1000_RXMTRL_PTP_V1_SYNC_MESSAGE;
		is_l4 = true;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
		tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L4_V1;
		rxmtrl = E1000_RXMTRL_PTP_V1_DELAY_REQ_MESSAGE;
		is_l4 = true;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
		/* Also time stamps V2 L2 Path Delay Request/Response */
		tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_V2;
		rxmtrl = E1000_RXMTRL_PTP_V2_SYNC_MESSAGE;
		is_l2 = true;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
		/* Also time stamps V2 L2 Path Delay Request/Response. */
		tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_V2;
		rxmtrl = E1000_RXMTRL_PTP_V2_DELAY_REQ_MESSAGE;
		is_l2 = true;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
		/* Hardware cannot filter just V2 L4 Sync messages;
		 * fall-through to V2 (both L2 and L4) Sync.
		 */
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
		/* Also time stamps V2 Path Delay Request/Response. */
		tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_L4_V2;
		rxmtrl = E1000_RXMTRL_PTP_V2_SYNC_MESSAGE;
		is_l2 = true;
		is_l4 = true;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
		/* Hardware cannot filter just V2 L4 Delay Request messages;
		 * fall-through to V2 (both L2 and L4) Delay Request.
		 */
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
		/* Also time stamps V2 Path Delay Request/Response. */
		tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_L2_L4_V2;
		rxmtrl = E1000_RXMTRL_PTP_V2_DELAY_REQ_MESSAGE;
		is_l2 = true;
		is_l4 = true;
		break;
	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
		/* Hardware cannot filter just V2 L4 or L2 Event messages;
		 * fall-through to all V2 (both L2 and L4) Events.
		 */
	case HWTSTAMP_FILTER_PTP_V2_EVENT:
		tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_EVENT_V2;
		config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
		is_l2 = true;
		is_l4 = true;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
		/* For V1, the hardware can only filter Sync messages or
		 * Delay Request messages but not both so fall-through to
		 * time stamp all packets.
		 */
	case HWTSTAMP_FILTER_ALL:
		is_l2 = true;
		is_l4 = true;
		tsync_rx_ctl |= E1000_TSYNCRXCTL_TYPE_ALL;
		config->rx_filter = HWTSTAMP_FILTER_ALL;
		break;
	default:
		return -ERANGE;
	}

	/* enable/disable Tx h/w time stamping */
	regval = er32(TSYNCTXCTL);
	regval &= ~E1000_TSYNCTXCTL_ENABLED;
	regval |= tsync_tx_ctl;
	ew32(TSYNCTXCTL, regval);
	if ((er32(TSYNCTXCTL) & E1000_TSYNCTXCTL_ENABLED) !=
	    (regval & E1000_TSYNCTXCTL_ENABLED)) {
		e_err("Timesync Tx Control register not set as expected\n");
		return -EAGAIN;
	}

	/* enable/disable Rx h/w time stamping */
	regval = er32(TSYNCRXCTL);
	regval &= ~(E1000_TSYNCRXCTL_ENABLED | E1000_TSYNCRXCTL_TYPE_MASK);
	regval |= tsync_rx_ctl;
	ew32(TSYNCRXCTL, regval);
	if ((er32(TSYNCRXCTL) & (E1000_TSYNCRXCTL_ENABLED |
				 E1000_TSYNCRXCTL_TYPE_MASK)) !=
	    (regval & (E1000_TSYNCRXCTL_ENABLED |
		       E1000_TSYNCRXCTL_TYPE_MASK))) {
		e_err("Timesync Rx Control register not set as expected\n");
		return -EAGAIN;
	}

	/* L2: define ethertype filter for time stamped packets */
	if (is_l2)
		rxmtrl |= ETH_P_1588;

	/* define which PTP packets get time stamped */
	ew32(RXMTRL, rxmtrl);

	/* Filter by destination port */
	if (is_l4) {
		rxudp = PTP_EV_PORT;
		cpu_to_be16s(&rxudp);
	}
	ew32(RXUDP, rxudp);

	e1e_flush();

	/* Clear TSYNCRXCTL_VALID & TSYNCTXCTL_VALID bit */
	er32(RXSTMPH);
	er32(TXSTMPH);

	/* Get and set the System Time Register SYSTIM base frequency */
	ret_val = e1000e_get_base_timinca(adapter, &regval);
	if (ret_val)
		return ret_val;
	ew32(TIMINCA, regval);

	/* reset the ns time counter */
	timecounter_init(&adapter->tc, &adapter->cc,
			 ktime_to_ns(ktime_get_real()));

	return 0;
}

/**
 * e1000_configure - configure the hardware for Rx and Tx
 * @adapter: private board structure
 **/
static void e1000_configure(struct e1000_adapter *adapter)
{
	struct e1000_ring *rx_ring = adapter->rx_ring;

	e1000e_set_rx_mode(adapter->netdev);

	e1000_restore_vlan(adapter);
	e1000_init_manageability_pt(adapter);

	e1000_configure_tx(adapter);

	if (adapter->netdev->features & NETIF_F_RXHASH)
		e1000e_setup_rss_hash(adapter);
	e1000_setup_rctl(adapter);
	e1000_configure_rx(adapter);
	adapter->alloc_rx_buf(rx_ring, e1000_desc_unused(rx_ring), GFP_KERNEL);
}

/**
 * e1000e_power_up_phy - restore link in case the phy was powered down
 * @adapter: address of board private structure
 *
 * The phy may be powered down to save power and turn off link when the
 * driver is unloaded and wake on lan is not enabled (among others)
 * *** this routine MUST be followed by a call to e1000e_reset ***
 **/
void e1000e_power_up_phy(struct e1000_adapter *adapter)
{
	if (adapter->hw.phy.ops.power_up)
		adapter->hw.phy.ops.power_up(&adapter->hw);

	adapter->hw.mac.ops.setup_link(&adapter->hw);
}

/**
 * e1000_power_down_phy - Power down the PHY
 *
 * Power down the PHY so no link is implied when interface is down.
 * The PHY cannot be powered down if management or WoL is active.
 */
static void e1000_power_down_phy(struct e1000_adapter *adapter)
{
	/* WoL is enabled */
	if (adapter->wol)
		return;

	if (adapter->hw.phy.ops.power_down)
		adapter->hw.phy.ops.power_down(&adapter->hw);
}

/**
 * e1000e_reset - bring the hardware into a known good state
 *
 * This function boots the hardware and enables some settings that
 * require a configuration cycle of the hardware - those cannot be
 * set/changed during runtime. After reset the device needs to be
 * properly configured for Rx, Tx etc.
 */
void e1000e_reset(struct e1000_adapter *adapter)
{
	struct e1000_mac_info *mac = &adapter->hw.mac;
	struct e1000_fc_info *fc = &adapter->hw.fc;
	struct e1000_hw *hw = &adapter->hw;
	u32 tx_space, min_tx_space, min_rx_space;
	u32 pba = adapter->pba;
	u16 hwm;

	/* reset Packet Buffer Allocation to default */
	ew32(PBA, pba);

	if (adapter->max_frame_size > ETH_FRAME_LEN + ETH_FCS_LEN) {
		/* To maintain wire speed transmits, the Tx FIFO should be
		 * large enough to accommodate two full transmit packets,
		 * rounded up to the next 1KB and expressed in KB.  Likewise,
		 * the Rx FIFO should be large enough to accommodate at least
		 * one full receive packet and is similarly rounded up and
		 * expressed in KB.
		 */
		pba = er32(PBA);
		/* upper 16 bits has Tx packet buffer allocation size in KB */
		tx_space = pba >> 16;
		/* lower 16 bits has Rx packet buffer allocation size in KB */
		pba &= 0xffff;
		/* the Tx fifo also stores 16 bytes of information about the Tx
		 * but don't include ethernet FCS because hardware appends it
		 */
		min_tx_space = (adapter->max_frame_size +
				sizeof(struct e1000_tx_desc) -
				ETH_FCS_LEN) * 2;
		min_tx_space = ALIGN(min_tx_space, 1024);
		min_tx_space >>= 10;
		/* software strips receive CRC, so leave room for it */
		min_rx_space = adapter->max_frame_size;
		min_rx_space = ALIGN(min_rx_space, 1024);
		min_rx_space >>= 10;

		/* If current Tx allocation is less than the min Tx FIFO size,
		 * and the min Tx FIFO size is less than the current Rx FIFO
		 * allocation, take space away from current Rx allocation
		 */
		if ((tx_space < min_tx_space) &&
		    ((min_tx_space - tx_space) < pba)) {
			pba -= min_tx_space - tx_space;

			/* if short on Rx space, Rx wins and must trump Tx
			 * adjustment
			 */
			if (pba < min_rx_space)
				pba = min_rx_space;
		}

		ew32(PBA, pba);
	}

	/* flow control settings
	 *
	 * The high water mark must be low enough to fit one full frame
	 * (or the size used for early receive) above it in the Rx FIFO.
	 * Set it to the lower of:
	 * - 90% of the Rx FIFO size, and
	 * - the full Rx FIFO size minus one full frame
	 */
	if (adapter->flags & FLAG_DISABLE_FC_PAUSE_TIME)
		fc->pause_time = 0xFFFF;
	else
		fc->pause_time = E1000_FC_PAUSE_TIME;
	fc->send_xon = true;
	fc->current_mode = fc->requested_mode;

	switch (hw->mac.type) {
	case e1000_ich9lan:
	case e1000_ich10lan:
		if (adapter->netdev->mtu > ETH_DATA_LEN) {
			pba = 14;
			ew32(PBA, pba);
			fc->high_water = 0x2800;
			fc->low_water = fc->high_water - 8;
			break;
		}
		/* fall-through */
	default:
		hwm = min(((pba << 10) * 9 / 10),
			  ((pba << 10) - adapter->max_frame_size));

		fc->high_water = hwm & E1000_FCRTH_RTH; /* 8-byte granularity */
		fc->low_water = fc->high_water - 8;
		break;
	case e1000_pchlan:
		/* Workaround PCH LOM adapter hangs with certain network
		 * loads.  If hangs persist, try disabling Tx flow control.
		 */
		if (adapter->netdev->mtu > ETH_DATA_LEN) {
			fc->high_water = 0x3500;
			fc->low_water  = 0x1500;
		} else {
			fc->high_water = 0x5000;
			fc->low_water  = 0x3000;
		}
		fc->refresh_time = 0x1000;
		break;
	case e1000_pch2lan:
	case e1000_pch_lpt:
		fc->refresh_time = 0x0400;

		if (adapter->netdev->mtu <= ETH_DATA_LEN) {
			fc->high_water = 0x05C20;
			fc->low_water = 0x05048;
			fc->pause_time = 0x0650;
			break;
		}

		fc->high_water = ((pba << 10) * 9 / 10) & E1000_FCRTH_RTH;
		fc->low_water = ((pba << 10) * 8 / 10) & E1000_FCRTL_RTL;
		break;
	}

	/* Alignment of Tx data is on an arbitrary byte boundary with the
	 * maximum size per Tx descriptor limited only to the transmit
	 * allocation of the packet buffer minus 96 bytes with an upper
	 * limit of 24KB due to receive synchronization limitations.
	 */
	adapter->tx_fifo_limit = min_t(u32, ((er32(PBA) >> 16) << 10) - 96,
				       24 << 10);

	/* Disable Adaptive Interrupt Moderation if 2 full packets cannot
	 * fit in receive buffer.
	 */
	if (adapter->itr_setting & 0x3) {
		if ((adapter->max_frame_size * 2) > (pba << 10)) {
			if (!(adapter->flags2 & FLAG2_DISABLE_AIM)) {
				dev_info(&adapter->pdev->dev,
					"Interrupt Throttle Rate turned off\n");
				adapter->flags2 |= FLAG2_DISABLE_AIM;
				e1000e_write_itr(adapter, 0);
			}
		} else if (adapter->flags2 & FLAG2_DISABLE_AIM) {
			dev_info(&adapter->pdev->dev,
				 "Interrupt Throttle Rate turned on\n");
			adapter->flags2 &= ~FLAG2_DISABLE_AIM;
			adapter->itr = 20000;
			e1000e_write_itr(adapter, adapter->itr);
		}
	}

	/* Allow time for pending master requests to run */
	mac->ops.reset_hw(hw);

	/* For parts with AMT enabled, let the firmware know
	 * that the network interface is in control
	 */
	if (adapter->flags & FLAG_HAS_AMT)
		e1000e_get_hw_control(adapter);

	ew32(WUC, 0);

	if (mac->ops.init_hw(hw))
		e_err("Hardware Error\n");

	e1000_update_mng_vlan(adapter);

	/* Enable h/w to recognize an 802.1Q VLAN Ethernet packet */
	ew32(VET, ETH_P_8021Q);

	e1000e_reset_adaptive(hw);

	/* initialize systim and reset the ns time counter */
	e1000e_config_hwtstamp(adapter);

	if (!netif_running(adapter->netdev) &&
	    !test_bit(__E1000_TESTING, &adapter->state)) {
		e1000_power_down_phy(adapter);
		return;
	}

	e1000_get_phy_info(hw);

	if ((adapter->flags & FLAG_HAS_SMART_POWER_DOWN) &&
	    !(adapter->flags & FLAG_SMART_POWER_DOWN)) {
		u16 phy_data = 0;
		/* speed up time to link by disabling smart power down, ignore
		 * the return value of this function because there is nothing
		 * different we would do if it failed
		 */
		e1e_rphy(hw, IGP02E1000_PHY_POWER_MGMT, &phy_data);
		phy_data &= ~IGP02E1000_PM_SPD;
		e1e_wphy(hw, IGP02E1000_PHY_POWER_MGMT, phy_data);
	}
}

int e1000e_up(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;

	/* hardware has been reset, we need to reload some things */
	e1000_configure(adapter);

	clear_bit(__E1000_DOWN, &adapter->state);

	if (adapter->msix_entries)
		e1000_configure_msix(adapter);
	e1000_irq_enable(adapter);

	netif_start_queue(adapter->netdev);

	/* fire a link change interrupt to start the watchdog */
	if (adapter->msix_entries)
		ew32(ICS, E1000_ICS_LSC | E1000_ICR_OTHER);
	else
		ew32(ICS, E1000_ICS_LSC);

	return 0;
}

static void e1000e_flush_descriptors(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;

	if (!(adapter->flags2 & FLAG2_DMA_BURST))
		return;

	/* flush pending descriptor writebacks to memory */
	ew32(TIDV, adapter->tx_int_delay | E1000_TIDV_FPD);
	ew32(RDTR, adapter->rx_int_delay | E1000_RDTR_FPD);

	/* execute the writes immediately */
	e1e_flush();

	/* due to rare timing issues, write to TIDV/RDTR again to ensure the
	 * write is successful
	 */
	ew32(TIDV, adapter->tx_int_delay | E1000_TIDV_FPD);
	ew32(RDTR, adapter->rx_int_delay | E1000_RDTR_FPD);

	/* execute the writes immediately */
	e1e_flush();
}

static void e1000e_update_stats(struct e1000_adapter *adapter);

void e1000e_down(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	u32 tctl, rctl;

	/* signal that we're down so the interrupt handler does not
	 * reschedule our watchdog timer
	 */
	set_bit(__E1000_DOWN, &adapter->state);

	/* disable receives in the hardware */
	rctl = er32(RCTL);
	if (!(adapter->flags2 & FLAG2_NO_DISABLE_RX))
		ew32(RCTL, rctl & ~E1000_RCTL_EN);
	/* flush and sleep below */

	netif_stop_queue(netdev);

	/* disable transmits in the hardware */
	tctl = er32(TCTL);
	tctl &= ~E1000_TCTL_EN;
	ew32(TCTL, tctl);

	/* flush both disables and wait for them to finish */
	e1e_flush();
	usleep_range(10000, 20000);

	e1000_irq_disable(adapter);

	del_timer_sync(&adapter->watchdog_timer);
	del_timer_sync(&adapter->phy_info_timer);

	netif_carrier_off(netdev);

	spin_lock(&adapter->stats64_lock);
	e1000e_update_stats(adapter);
	spin_unlock(&adapter->stats64_lock);

	e1000e_flush_descriptors(adapter);
	e1000_clean_tx_ring(adapter->tx_ring);
	e1000_clean_rx_ring(adapter->rx_ring);

	adapter->link_speed = 0;
	adapter->link_duplex = 0;

	if (!pci_channel_offline(adapter->pdev))
		e1000e_reset(adapter);

	/* TODO: for power management, we could drop the link and
	 * pci_disable_device here.
	 */
}

void e1000e_reinit_locked(struct e1000_adapter *adapter)
{
	might_sleep();
	while (test_and_set_bit(__E1000_RESETTING, &adapter->state))
		usleep_range(1000, 2000);
	e1000e_down(adapter);
	e1000e_up(adapter);
	clear_bit(__E1000_RESETTING, &adapter->state);
}

/**
 * e1000e_cyclecounter_read - read raw cycle counter (used by time counter)
 * @cc: cyclecounter structure
 **/
static cycle_t e1000e_cyclecounter_read(const struct cyclecounter *cc)
{
	struct e1000_adapter *adapter = container_of(cc, struct e1000_adapter,
						     cc);
	struct e1000_hw *hw = &adapter->hw;
	cycle_t systim;

	/* latch SYSTIMH on read of SYSTIML */
	systim = (cycle_t)er32(SYSTIML);
	systim |= (cycle_t)er32(SYSTIMH) << 32;

	return systim;
}

/**
 * e1000_sw_init - Initialize general software structures (struct e1000_adapter)
 * @adapter: board private structure to initialize
 *
 * e1000_sw_init initializes the Adapter private data structure.
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 **/
static int e1000_sw_init(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;

	adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN;
	adapter->rx_ps_bsize0 = 128;
	adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
	adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
	adapter->tx_ring_count = E1000_DEFAULT_TXD;
	adapter->rx_ring_count = E1000_DEFAULT_RXD;

	spin_lock_init(&adapter->stats64_lock);

	e1000e_set_interrupt_capability(adapter);

	if (e1000_alloc_queues(adapter))
		return -ENOMEM;

	/* Setup hardware time stamping cyclecounter */
	if (adapter->flags & FLAG_HAS_HW_TIMESTAMP) {
		adapter->cc.read = e1000e_cyclecounter_read;
		adapter->cc.mask = CLOCKSOURCE_MASK(64);
		adapter->cc.mult = 1;
		/* cc.shift set in e1000e_get_base_tininca() */

		spin_lock_init(&adapter->systim_lock);
		INIT_WORK(&adapter->tx_hwtstamp_work, e1000e_tx_hwtstamp_work);
	}

	/* Explicitly disable IRQ since the NIC can be in any state. */
	e1000_irq_disable(adapter);

	set_bit(__E1000_DOWN, &adapter->state);
	return 0;
}

/**
 * e1000_intr_msi_test - Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 **/
static irqreturn_t e1000_intr_msi_test(int irq, void *data)
{
	struct net_device *netdev = data;
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u32 icr = er32(ICR);

	e_dbg("icr is %08X\n", icr);
	if (icr & E1000_ICR_RXSEQ) {
		adapter->flags &= ~FLAG_MSI_TEST_FAILED;
		/* Force memory writes to complete before acknowledging the
		 * interrupt is handled.
		 */
		wmb();
	}

	return IRQ_HANDLED;
}

/**
 * e1000_test_msi_interrupt - Returns 0 for successful test
 * @adapter: board private struct
 *
 * code flow taken from tg3.c
 **/
static int e1000_test_msi_interrupt(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	int err;

	/* poll_enable hasn't been called yet, so don't need disable */
	/* clear any pending events */
	er32(ICR);

	/* free the real vector and request a test handler */
	e1000_free_irq(adapter);
	e1000e_reset_interrupt_capability(adapter);

	/* Assume that the test fails, if it succeeds then the test
	 * MSI irq handler will unset this flag
	 */
	adapter->flags |= FLAG_MSI_TEST_FAILED;

	err = pci_enable_msi(adapter->pdev);
	if (err)
		goto msi_test_failed;

	err = request_irq(adapter->pdev->irq, e1000_intr_msi_test, 0,
			  netdev->name, netdev);
	if (err) {
		pci_disable_msi(adapter->pdev);
		goto msi_test_failed;
	}

	/* Force memory writes to complete before enabling and firing an
	 * interrupt.
	 */
	wmb();

	e1000_irq_enable(adapter);

	/* fire an unusual interrupt on the test handler */
	ew32(ICS, E1000_ICS_RXSEQ);
	e1e_flush();
	msleep(100);

	e1000_irq_disable(adapter);

	rmb();			/* read flags after interrupt has been fired */

	if (adapter->flags & FLAG_MSI_TEST_FAILED) {
		adapter->int_mode = E1000E_INT_MODE_LEGACY;
		e_info("MSI interrupt test failed, using legacy interrupt.\n");
	} else {
		e_dbg("MSI interrupt test succeeded!\n");
	}

	free_irq(adapter->pdev->irq, netdev);
	pci_disable_msi(adapter->pdev);

msi_test_failed:
	e1000e_set_interrupt_capability(adapter);
	return e1000_request_irq(adapter);
}

/**
 * e1000_test_msi - Returns 0 if MSI test succeeds or INTx mode is restored
 * @adapter: board private struct
 *
 * code flow taken from tg3.c, called with e1000 interrupts disabled.
 **/
static int e1000_test_msi(struct e1000_adapter *adapter)
{
	int err;
	u16 pci_cmd;

	if (!(adapter->flags & FLAG_MSI_ENABLED))
		return 0;

	/* disable SERR in case the MSI write causes a master abort */
	pci_read_config_word(adapter->pdev, PCI_COMMAND, &pci_cmd);
	if (pci_cmd & PCI_COMMAND_SERR)
		pci_write_config_word(adapter->pdev, PCI_COMMAND,
				      pci_cmd & ~PCI_COMMAND_SERR);

	err = e1000_test_msi_interrupt(adapter);

	/* re-enable SERR */
	if (pci_cmd & PCI_COMMAND_SERR) {
		pci_read_config_word(adapter->pdev, PCI_COMMAND, &pci_cmd);
		pci_cmd |= PCI_COMMAND_SERR;
		pci_write_config_word(adapter->pdev, PCI_COMMAND, pci_cmd);
	}

	return err;
}

/**
 * e1000_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog timer is started,
 * and the stack is notified that the interface is ready.
 **/
static int e1000_open(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	struct pci_dev *pdev = adapter->pdev;
	int err;

	/* disallow open during test */
	if (test_bit(__E1000_TESTING, &adapter->state))
		return -EBUSY;

	pm_runtime_get_sync(&pdev->dev);

	netif_carrier_off(netdev);

	/* allocate transmit descriptors */
	err = e1000e_setup_tx_resources(adapter->tx_ring);
	if (err)
		goto err_setup_tx;

	/* allocate receive descriptors */
	err = e1000e_setup_rx_resources(adapter->rx_ring);
	if (err)
		goto err_setup_rx;

	/* If AMT is enabled, let the firmware know that the network
	 * interface is now open and reset the part to a known state.
	 */
	if (adapter->flags & FLAG_HAS_AMT) {
		e1000e_get_hw_control(adapter);
		e1000e_reset(adapter);
	}

	e1000e_power_up_phy(adapter);

	adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
	if ((adapter->hw.mng_cookie.status &
	     E1000_MNG_DHCP_COOKIE_STATUS_VLAN))
		e1000_update_mng_vlan(adapter);

	/* DMA latency requirement to workaround jumbo issue */
	pm_qos_add_request(&adapter->netdev->pm_qos_req, PM_QOS_CPU_DMA_LATENCY,
			   PM_QOS_DEFAULT_VALUE);

	/* before we allocate an interrupt, we must be ready to handle it.
	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
	 * as soon as we call pci_request_irq, so we have to setup our
	 * clean_rx handler before we do so.
	 */
	e1000_configure(adapter);

	err = e1000_request_irq(adapter);
	if (err)
		goto err_req_irq;

	/* Work around PCIe errata with MSI interrupts causing some chipsets to
	 * ignore e1000e MSI messages, which means we need to test our MSI
	 * interrupt now
	 */
	if (adapter->int_mode != E1000E_INT_MODE_LEGACY) {
		err = e1000_test_msi(adapter);
		if (err) {
			e_err("Interrupt allocation failed\n");
			goto err_req_irq;
		}
	}

	/* From here on the code is the same as e1000e_up() */
	clear_bit(__E1000_DOWN, &adapter->state);

	napi_enable(&adapter->napi);

	e1000_irq_enable(adapter);

	adapter->tx_hang_recheck = false;
	netif_start_queue(netdev);

	adapter->idle_check = true;
	pm_runtime_put(&pdev->dev);

	/* fire a link status change interrupt to start the watchdog */
	if (adapter->msix_entries)
		ew32(ICS, E1000_ICS_LSC | E1000_ICR_OTHER);
	else
		ew32(ICS, E1000_ICS_LSC);

	return 0;

err_req_irq:
	e1000e_release_hw_control(adapter);
	e1000_power_down_phy(adapter);
	e1000e_free_rx_resources(adapter->rx_ring);
err_setup_rx:
	e1000e_free_tx_resources(adapter->tx_ring);
err_setup_tx:
	e1000e_reset(adapter);
	pm_runtime_put_sync(&pdev->dev);

	return err;
}

/**
 * e1000_close - Disables a network interface
 * @netdev: network interface device structure
 *
 * Returns 0, this is not allowed to fail
 *
 * The close entry point is called when an interface is de-activated
 * by the OS.  The hardware is still under the drivers control, but
 * needs to be disabled.  A global MAC reset is issued to stop the
 * hardware, and all transmit and receive resources are freed.
 **/
static int e1000_close(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct pci_dev *pdev = adapter->pdev;
	int count = E1000_CHECK_RESET_COUNT;

	while (test_bit(__E1000_RESETTING, &adapter->state) && count--)
		usleep_range(10000, 20000);

	WARN_ON(test_bit(__E1000_RESETTING, &adapter->state));

	pm_runtime_get_sync(&pdev->dev);

	napi_disable(&adapter->napi);

	if (!test_bit(__E1000_DOWN, &adapter->state)) {
		e1000e_down(adapter);
		e1000_free_irq(adapter);
	}
	e1000_power_down_phy(adapter);

	e1000e_free_tx_resources(adapter->tx_ring);
	e1000e_free_rx_resources(adapter->rx_ring);

	/* kill manageability vlan ID if supported, but not if a vlan with
	 * the same ID is registered on the host OS (let 8021q kill it)
	 */
	if (adapter->hw.mng_cookie.status &
	    E1000_MNG_DHCP_COOKIE_STATUS_VLAN)
		e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);

	/* If AMT is enabled, let the firmware know that the network
	 * interface is now closed
	 */
	if ((adapter->flags & FLAG_HAS_AMT) &&
	    !test_bit(__E1000_TESTING, &adapter->state))
		e1000e_release_hw_control(adapter);

	pm_qos_remove_request(&adapter->netdev->pm_qos_req);

	pm_runtime_put_sync(&pdev->dev);

	return 0;
}
/**
 * e1000_set_mac - Change the Ethernet Address of the NIC
 * @netdev: network interface device structure
 * @p: pointer to an address structure
 *
 * Returns 0 on success, negative on failure
 **/
static int e1000_set_mac(struct net_device *netdev, void *p)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	struct sockaddr *addr = p;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
	memcpy(adapter->hw.mac.addr, addr->sa_data, netdev->addr_len);

	hw->mac.ops.rar_set(&adapter->hw, adapter->hw.mac.addr, 0);

	if (adapter->flags & FLAG_RESET_OVERWRITES_LAA) {
		/* activate the work around */
		e1000e_set_laa_state_82571(&adapter->hw, 1);

		/* Hold a copy of the LAA in RAR[14] This is done so that
		 * between the time RAR[0] gets clobbered  and the time it
		 * gets fixed (in e1000_watchdog), the actual LAA is in one
		 * of the RARs and no incoming packets directed to this port
		 * are dropped. Eventually the LAA will be in RAR[0] and
		 * RAR[14]
		 */
		hw->mac.ops.rar_set(&adapter->hw, adapter->hw.mac.addr,
				    adapter->hw.mac.rar_entry_count - 1);
	}

	return 0;
}

/**
 * e1000e_update_phy_task - work thread to update phy
 * @work: pointer to our work struct
 *
 * this worker thread exists because we must acquire a
 * semaphore to read the phy, which we could msleep while
 * waiting for it, and we can't msleep in a timer.
 **/
static void e1000e_update_phy_task(struct work_struct *work)
{
	struct e1000_adapter *adapter = container_of(work,
					struct e1000_adapter, update_phy_task);

	if (test_bit(__E1000_DOWN, &adapter->state))
		return;

	e1000_get_phy_info(&adapter->hw);
}

/**
 * e1000_update_phy_info - timre call-back to update PHY info
 * @data: pointer to adapter cast into an unsigned long
 *
 * Need to wait a few seconds after link up to get diagnostic information from
 * the phy
 **/
static void e1000_update_phy_info(unsigned long data)
{
	struct e1000_adapter *adapter = (struct e1000_adapter *) data;

	if (test_bit(__E1000_DOWN, &adapter->state))
		return;

	schedule_work(&adapter->update_phy_task);
}

/**
 * e1000e_update_phy_stats - Update the PHY statistics counters
 * @adapter: board private structure
 *
 * Read/clear the upper 16-bit PHY registers and read/accumulate lower
 **/
static void e1000e_update_phy_stats(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	s32 ret_val;
	u16 phy_data;

	ret_val = hw->phy.ops.acquire(hw);
	if (ret_val)
		return;

	/* A page set is expensive so check if already on desired page.
	 * If not, set to the page with the PHY status registers.
	 */
	hw->phy.addr = 1;
	ret_val = e1000e_read_phy_reg_mdic(hw, IGP01E1000_PHY_PAGE_SELECT,
					   &phy_data);
	if (ret_val)
		goto release;
	if (phy_data != (HV_STATS_PAGE << IGP_PAGE_SHIFT)) {
		ret_val = hw->phy.ops.set_page(hw,
					       HV_STATS_PAGE << IGP_PAGE_SHIFT);
		if (ret_val)
			goto release;
	}

	/* Single Collision Count */
	hw->phy.ops.read_reg_page(hw, HV_SCC_UPPER, &phy_data);
	ret_val = hw->phy.ops.read_reg_page(hw, HV_SCC_LOWER, &phy_data);
	if (!ret_val)
		adapter->stats.scc += phy_data;

	/* Excessive Collision Count */
	hw->phy.ops.read_reg_page(hw, HV_ECOL_UPPER, &phy_data);
	ret_val = hw->phy.ops.read_reg_page(hw, HV_ECOL_LOWER, &phy_data);
	if (!ret_val)
		adapter->stats.ecol += phy_data;

	/* Multiple Collision Count */
	hw->phy.ops.read_reg_page(hw, HV_MCC_UPPER, &phy_data);
	ret_val = hw->phy.ops.read_reg_page(hw, HV_MCC_LOWER, &phy_data);
	if (!ret_val)
		adapter->stats.mcc += phy_data;

	/* Late Collision Count */
	hw->phy.ops.read_reg_page(hw, HV_LATECOL_UPPER, &phy_data);
	ret_val = hw->phy.ops.read_reg_page(hw, HV_LATECOL_LOWER, &phy_data);
	if (!ret_val)
		adapter->stats.latecol += phy_data;

	/* Collision Count - also used for adaptive IFS */
	hw->phy.ops.read_reg_page(hw, HV_COLC_UPPER, &phy_data);
	ret_val = hw->phy.ops.read_reg_page(hw, HV_COLC_LOWER, &phy_data);
	if (!ret_val)
		hw->mac.collision_delta = phy_data;

	/* Defer Count */
	hw->phy.ops.read_reg_page(hw, HV_DC_UPPER, &phy_data);
	ret_val = hw->phy.ops.read_reg_page(hw, HV_DC_LOWER, &phy_data);
	if (!ret_val)
		adapter->stats.dc += phy_data;

	/* Transmit with no CRS */
	hw->phy.ops.read_reg_page(hw, HV_TNCRS_UPPER, &phy_data);
	ret_val = hw->phy.ops.read_reg_page(hw, HV_TNCRS_LOWER, &phy_data);
	if (!ret_val)
		adapter->stats.tncrs += phy_data;

release:
	hw->phy.ops.release(hw);
}

/**
 * e1000e_update_stats - Update the board statistics counters
 * @adapter: board private structure
 **/
static void e1000e_update_stats(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	struct pci_dev *pdev = adapter->pdev;

	/* Prevent stats update while adapter is being reset, or if the pci
	 * connection is down.
	 */
	if (adapter->link_speed == 0)
		return;
	if (pci_channel_offline(pdev))
		return;

	adapter->stats.crcerrs += er32(CRCERRS);
	adapter->stats.gprc += er32(GPRC);
	adapter->stats.gorc += er32(GORCL);
	er32(GORCH); /* Clear gorc */
	adapter->stats.bprc += er32(BPRC);
	adapter->stats.mprc += er32(MPRC);
	adapter->stats.roc += er32(ROC);

	adapter->stats.mpc += er32(MPC);

	/* Half-duplex statistics */
	if (adapter->link_duplex == HALF_DUPLEX) {
		if (adapter->flags2 & FLAG2_HAS_PHY_STATS) {
			e1000e_update_phy_stats(adapter);
		} else {
			adapter->stats.scc += er32(SCC);
			adapter->stats.ecol += er32(ECOL);
			adapter->stats.mcc += er32(MCC);
			adapter->stats.latecol += er32(LATECOL);
			adapter->stats.dc += er32(DC);

			hw->mac.collision_delta = er32(COLC);

			if ((hw->mac.type != e1000_82574) &&
			    (hw->mac.type != e1000_82583))
				adapter->stats.tncrs += er32(TNCRS);
		}
		adapter->stats.colc += hw->mac.collision_delta;
	}

	adapter->stats.xonrxc += er32(XONRXC);
	adapter->stats.xontxc += er32(XONTXC);
	adapter->stats.xoffrxc += er32(XOFFRXC);
	adapter->stats.xofftxc += er32(XOFFTXC);
	adapter->stats.gptc += er32(GPTC);
	adapter->stats.gotc += er32(GOTCL);
	er32(GOTCH); /* Clear gotc */
	adapter->stats.rnbc += er32(RNBC);
	adapter->stats.ruc += er32(RUC);

	adapter->stats.mptc += er32(MPTC);
	adapter->stats.bptc += er32(BPTC);

	/* used for adaptive IFS */

	hw->mac.tx_packet_delta = er32(TPT);
	adapter->stats.tpt += hw->mac.tx_packet_delta;

	adapter->stats.algnerrc += er32(ALGNERRC);
	adapter->stats.rxerrc += er32(RXERRC);
	adapter->stats.cexterr += er32(CEXTERR);
	adapter->stats.tsctc += er32(TSCTC);
	adapter->stats.tsctfc += er32(TSCTFC);

	/* Fill out the OS statistics structure */
	netdev->stats.multicast = adapter->stats.mprc;
	netdev->stats.collisions = adapter->stats.colc;

	/* Rx Errors */

	/* RLEC on some newer hardware can be incorrect so build
	 * our own version based on RUC and ROC
	 */
	netdev->stats.rx_errors = adapter->stats.rxerrc +
		adapter->stats.crcerrs + adapter->stats.algnerrc +
		adapter->stats.ruc + adapter->stats.roc +
		adapter->stats.cexterr;
	netdev->stats.rx_length_errors = adapter->stats.ruc +
					      adapter->stats.roc;
	netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
	netdev->stats.rx_frame_errors = adapter->stats.algnerrc;
	netdev->stats.rx_missed_errors = adapter->stats.mpc;

	/* Tx Errors */
	netdev->stats.tx_errors = adapter->stats.ecol +
				       adapter->stats.latecol;
	netdev->stats.tx_aborted_errors = adapter->stats.ecol;
	netdev->stats.tx_window_errors = adapter->stats.latecol;
	netdev->stats.tx_carrier_errors = adapter->stats.tncrs;

	/* Tx Dropped needs to be maintained elsewhere */

	/* Management Stats */
	adapter->stats.mgptc += er32(MGTPTC);
	adapter->stats.mgprc += er32(MGTPRC);
	adapter->stats.mgpdc += er32(MGTPDC);

	/* Correctable ECC Errors */
	if (hw->mac.type == e1000_pch_lpt) {
		u32 pbeccsts = er32(PBECCSTS);
		adapter->corr_errors +=
		    pbeccsts & E1000_PBECCSTS_CORR_ERR_CNT_MASK;
		adapter->uncorr_errors +=
		    (pbeccsts & E1000_PBECCSTS_UNCORR_ERR_CNT_MASK) >>
		    E1000_PBECCSTS_UNCORR_ERR_CNT_SHIFT;
	}
}

/**
 * e1000_phy_read_status - Update the PHY register status snapshot
 * @adapter: board private structure
 **/
static void e1000_phy_read_status(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	struct e1000_phy_regs *phy = &adapter->phy_regs;

	if ((er32(STATUS) & E1000_STATUS_LU) &&
	    (adapter->hw.phy.media_type == e1000_media_type_copper)) {
		int ret_val;

		ret_val  = e1e_rphy(hw, PHY_CONTROL, &phy->bmcr);
		ret_val |= e1e_rphy(hw, PHY_STATUS, &phy->bmsr);
		ret_val |= e1e_rphy(hw, PHY_AUTONEG_ADV, &phy->advertise);
		ret_val |= e1e_rphy(hw, PHY_LP_ABILITY, &phy->lpa);
		ret_val |= e1e_rphy(hw, PHY_AUTONEG_EXP, &phy->expansion);
		ret_val |= e1e_rphy(hw, PHY_1000T_CTRL, &phy->ctrl1000);
		ret_val |= e1e_rphy(hw, PHY_1000T_STATUS, &phy->stat1000);
		ret_val |= e1e_rphy(hw, PHY_EXT_STATUS, &phy->estatus);
		if (ret_val)
			e_warn("Error reading PHY register\n");
	} else {
		/* Do not read PHY registers if link is not up
		 * Set values to typical power-on defaults
		 */
		phy->bmcr = (BMCR_SPEED1000 | BMCR_ANENABLE | BMCR_FULLDPLX);
		phy->bmsr = (BMSR_100FULL | BMSR_100HALF | BMSR_10FULL |
			     BMSR_10HALF | BMSR_ESTATEN | BMSR_ANEGCAPABLE |
			     BMSR_ERCAP);
		phy->advertise = (ADVERTISE_PAUSE_ASYM | ADVERTISE_PAUSE_CAP |
				  ADVERTISE_ALL | ADVERTISE_CSMA);
		phy->lpa = 0;
		phy->expansion = EXPANSION_ENABLENPAGE;
		phy->ctrl1000 = ADVERTISE_1000FULL;
		phy->stat1000 = 0;
		phy->estatus = (ESTATUS_1000_TFULL | ESTATUS_1000_THALF);
	}
}

static void e1000_print_link_info(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 ctrl = er32(CTRL);

	/* Link status message must follow this format for user tools */
	pr_info("%s NIC Link is Up %d Mbps %s Duplex, Flow Control: %s\n",
		adapter->netdev->name, adapter->link_speed,
		adapter->link_duplex == FULL_DUPLEX ? "Full" : "Half",
		(ctrl & E1000_CTRL_TFCE) && (ctrl & E1000_CTRL_RFCE) ? "Rx/Tx" :
		(ctrl & E1000_CTRL_RFCE) ? "Rx" :
		(ctrl & E1000_CTRL_TFCE) ? "Tx" : "None");
}

static bool e1000e_has_link(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	bool link_active = false;
	s32 ret_val = 0;

	/* get_link_status is set on LSC (link status) interrupt or
	 * Rx sequence error interrupt.  get_link_status will stay
	 * false until the check_for_link establishes link
	 * for copper adapters ONLY
	 */
	switch (hw->phy.media_type) {
	case e1000_media_type_copper:
		if (hw->mac.get_link_status) {
			ret_val = hw->mac.ops.check_for_link(hw);
			link_active = !hw->mac.get_link_status;
		} else {
			link_active = true;
		}
		break;
	case e1000_media_type_fiber:
		ret_val = hw->mac.ops.check_for_link(hw);
		link_active = !!(er32(STATUS) & E1000_STATUS_LU);
		break;
	case e1000_media_type_internal_serdes:
		ret_val = hw->mac.ops.check_for_link(hw);
		link_active = adapter->hw.mac.serdes_has_link;
		break;
	default:
	case e1000_media_type_unknown:
		break;
	}

	if ((ret_val == E1000_ERR_PHY) && (hw->phy.type == e1000_phy_igp_3) &&
	    (er32(CTRL) & E1000_PHY_CTRL_GBE_DISABLE)) {
		/* See e1000_kmrn_lock_loss_workaround_ich8lan() */
		e_info("Gigabit has been disabled, downgrading speed\n");
	}

	return link_active;
}

static void e1000e_enable_receives(struct e1000_adapter *adapter)
{
	/* make sure the receive unit is started */
	if ((adapter->flags & FLAG_RX_NEEDS_RESTART) &&
	    (adapter->flags & FLAG_RESTART_NOW)) {
		struct e1000_hw *hw = &adapter->hw;
		u32 rctl = er32(RCTL);
		ew32(RCTL, rctl | E1000_RCTL_EN);
		adapter->flags &= ~FLAG_RESTART_NOW;
	}
}

static void e1000e_check_82574_phy_workaround(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;

	/* With 82574 controllers, PHY needs to be checked periodically
	 * for hung state and reset, if two calls return true
	 */
	if (e1000_check_phy_82574(hw))
		adapter->phy_hang_count++;
	else
		adapter->phy_hang_count = 0;

	if (adapter->phy_hang_count > 1) {
		adapter->phy_hang_count = 0;
		schedule_work(&adapter->reset_task);
	}
}

/**
 * e1000_watchdog - Timer Call-back
 * @data: pointer to adapter cast into an unsigned long
 **/
static void e1000_watchdog(unsigned long data)
{
	struct e1000_adapter *adapter = (struct e1000_adapter *) data;

	/* Do the rest outside of interrupt context */
	schedule_work(&adapter->watchdog_task);

	/* TODO: make this use queue_delayed_work() */
}

static void e1000_watchdog_task(struct work_struct *work)
{
	struct e1000_adapter *adapter = container_of(work,
					struct e1000_adapter, watchdog_task);
	struct net_device *netdev = adapter->netdev;
	struct e1000_mac_info *mac = &adapter->hw.mac;
	struct e1000_phy_info *phy = &adapter->hw.phy;
	struct e1000_ring *tx_ring = adapter->tx_ring;
	struct e1000_hw *hw = &adapter->hw;
	u32 link, tctl;

	if (test_bit(__E1000_DOWN, &adapter->state))
		return;

	link = e1000e_has_link(adapter);
	if ((netif_carrier_ok(netdev)) && link) {
		/* Cancel scheduled suspend requests. */
		pm_runtime_resume(netdev->dev.parent);

		e1000e_enable_receives(adapter);
		goto link_up;
	}

	if ((e1000e_enable_tx_pkt_filtering(hw)) &&
	    (adapter->mng_vlan_id != adapter->hw.mng_cookie.vlan_id))
		e1000_update_mng_vlan(adapter);

	if (link) {
		if (!netif_carrier_ok(netdev)) {
			bool txb2b = true;

			/* Cancel scheduled suspend requests. */
			pm_runtime_resume(netdev->dev.parent);

			/* update snapshot of PHY registers on LSC */
			e1000_phy_read_status(adapter);
			mac->ops.get_link_up_info(&adapter->hw,
						   &adapter->link_speed,
						   &adapter->link_duplex);
			e1000_print_link_info(adapter);
			/* On supported PHYs, check for duplex mismatch only
			 * if link has autonegotiated at 10/100 half
			 */
			if ((hw->phy.type == e1000_phy_igp_3 ||
			     hw->phy.type == e1000_phy_bm) &&
			    (hw->mac.autoneg == true) &&
			    (adapter->link_speed == SPEED_10 ||
			     adapter->link_speed == SPEED_100) &&
			    (adapter->link_duplex == HALF_DUPLEX)) {
				u16 autoneg_exp;

				e1e_rphy(hw, PHY_AUTONEG_EXP, &autoneg_exp);

				if (!(autoneg_exp & NWAY_ER_LP_NWAY_CAPS))
					e_info("Autonegotiated half duplex but link partner cannot autoneg.  Try forcing full duplex if link gets many collisions.\n");
			}

			/* adjust timeout factor according to speed/duplex */
			adapter->tx_timeout_factor = 1;
			switch (adapter->link_speed) {
			case SPEED_10:
				txb2b = false;
				adapter->tx_timeout_factor = 16;
				break;
			case SPEED_100:
				txb2b = false;
				adapter->tx_timeout_factor = 10;
				break;
			}

			/* workaround: re-program speed mode bit after
			 * link-up event
			 */
			if ((adapter->flags & FLAG_TARC_SPEED_MODE_BIT) &&
			    !txb2b) {
				u32 tarc0;
				tarc0 = er32(TARC(0));
				tarc0 &= ~SPEED_MODE_BIT;
				ew32(TARC(0), tarc0);
			}

			/* disable TSO for pcie and 10/100 speeds, to avoid
			 * some hardware issues
			 */
			if (!(adapter->flags & FLAG_TSO_FORCE)) {
				switch (adapter->link_speed) {
				case SPEED_10:
				case SPEED_100:
					e_info("10/100 speed: disabling TSO\n");
					netdev->features &= ~NETIF_F_TSO;
					netdev->features &= ~NETIF_F_TSO6;
					break;
				case SPEED_1000:
					netdev->features |= NETIF_F_TSO;
					netdev->features |= NETIF_F_TSO6;
					break;
				default:
					/* oops */
					break;
				}
			}

			/* enable transmits in the hardware, need to do this
			 * after setting TARC(0)
			 */
			tctl = er32(TCTL);
			tctl |= E1000_TCTL_EN;
			ew32(TCTL, tctl);

			/* Perform any post-link-up configuration before
			 * reporting link up.
			 */
			if (phy->ops.cfg_on_link_up)
				phy->ops.cfg_on_link_up(hw);

			netif_carrier_on(netdev);

			if (!test_bit(__E1000_DOWN, &adapter->state))
				mod_timer(&adapter->phy_info_timer,
					  round_jiffies(jiffies + 2 * HZ));
		}
	} else {
		if (netif_carrier_ok(netdev)) {
			adapter->link_speed = 0;
			adapter->link_duplex = 0;
			/* Link status message must follow this format */
			pr_info("%s NIC Link is Down\n", adapter->netdev->name);
			netif_carrier_off(netdev);
			if (!test_bit(__E1000_DOWN, &adapter->state))
				mod_timer(&adapter->phy_info_timer,
					  round_jiffies(jiffies + 2 * HZ));

			/* The link is lost so the controller stops DMA.
			 * If there is queued Tx work that cannot be done
			 * or if on an 8000ES2LAN which requires a Rx packet
			 * buffer work-around on link down event, reset the
			 * controller to flush the Tx/Rx packet buffers.
			 * (Do the reset outside of interrupt context).
			 */
			if ((adapter->flags & FLAG_RX_NEEDS_RESTART) ||
			    (e1000_desc_unused(tx_ring) + 1 < tx_ring->count))
				adapter->flags |= FLAG_RESTART_NOW;
			else
				pm_schedule_suspend(netdev->dev.parent,
							LINK_TIMEOUT);
		}
	}

link_up:
	spin_lock(&adapter->stats64_lock);
	e1000e_update_stats(adapter);

	mac->tx_packet_delta = adapter->stats.tpt - adapter->tpt_old;
	adapter->tpt_old = adapter->stats.tpt;
	mac->collision_delta = adapter->stats.colc - adapter->colc_old;
	adapter->colc_old = adapter->stats.colc;

	adapter->gorc = adapter->stats.gorc - adapter->gorc_old;
	adapter->gorc_old = adapter->stats.gorc;
	adapter->gotc = adapter->stats.gotc - adapter->gotc_old;
	adapter->gotc_old = adapter->stats.gotc;
	spin_unlock(&adapter->stats64_lock);

	if (adapter->flags & FLAG_RESTART_NOW) {
		schedule_work(&adapter->reset_task);
		/* return immediately since reset is imminent */
		return;
	}

	e1000e_update_adaptive(&adapter->hw);

	/* Simple mode for Interrupt Throttle Rate (ITR) */
	if (adapter->itr_setting == 4) {
		/* Symmetric Tx/Rx gets a reduced ITR=2000;
		 * Total asymmetrical Tx or Rx gets ITR=8000;
		 * everyone else is between 2000-8000.
		 */
		u32 goc = (adapter->gotc + adapter->gorc) / 10000;
		u32 dif = (adapter->gotc > adapter->gorc ?
			    adapter->gotc - adapter->gorc :
			    adapter->gorc - adapter->gotc) / 10000;
		u32 itr = goc > 0 ? (dif * 6000 / goc + 2000) : 8000;

		e1000e_write_itr(adapter, itr);
	}

	/* Cause software interrupt to ensure Rx ring is cleaned */
	if (adapter->msix_entries)
		ew32(ICS, adapter->rx_ring->ims_val);
	else
		ew32(ICS, E1000_ICS_RXDMT0);

	/* flush pending descriptors to memory before detecting Tx hang */
	e1000e_flush_descriptors(adapter);

	/* Force detection of hung controller every watchdog period */
	adapter->detect_tx_hung = true;

	/* With 82571 controllers, LAA may be overwritten due to controller
	 * reset from the other port. Set the appropriate LAA in RAR[0]
	 */
	if (e1000e_get_laa_state_82571(hw))
		hw->mac.ops.rar_set(hw, adapter->hw.mac.addr, 0);

	if (adapter->flags2 & FLAG2_CHECK_PHY_HANG)
		e1000e_check_82574_phy_workaround(adapter);

	/* Clear valid timestamp stuck in RXSTMPL/H due to a Rx error */
	if (adapter->hwtstamp_config.rx_filter != HWTSTAMP_FILTER_NONE) {
		if ((adapter->flags2 & FLAG2_CHECK_RX_HWTSTAMP) &&
		    (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_VALID)) {
			er32(RXSTMPH);
			adapter->rx_hwtstamp_cleared++;
		} else {
			adapter->flags2 |= FLAG2_CHECK_RX_HWTSTAMP;
		}
	}

	/* Reset the timer */
	if (!test_bit(__E1000_DOWN, &adapter->state))
		mod_timer(&adapter->watchdog_timer,
			  round_jiffies(jiffies + 2 * HZ));
}

#define E1000_TX_FLAGS_CSUM		0x00000001
#define E1000_TX_FLAGS_VLAN		0x00000002
#define E1000_TX_FLAGS_TSO		0x00000004
#define E1000_TX_FLAGS_IPV4		0x00000008
#define E1000_TX_FLAGS_NO_FCS		0x00000010
#define E1000_TX_FLAGS_HWTSTAMP		0x00000020
#define E1000_TX_FLAGS_VLAN_MASK	0xffff0000
#define E1000_TX_FLAGS_VLAN_SHIFT	16

static int e1000_tso(struct e1000_ring *tx_ring, struct sk_buff *skb)
{
	struct e1000_context_desc *context_desc;
	struct e1000_buffer *buffer_info;
	unsigned int i;
	u32 cmd_length = 0;
	u16 ipcse = 0, mss;
	u8 ipcss, ipcso, tucss, tucso, hdr_len;

	if (!skb_is_gso(skb))
		return 0;

	if (skb_header_cloned(skb)) {
		int err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);

		if (err)
			return err;
	}

	hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
	mss = skb_shinfo(skb)->gso_size;
	if (skb->protocol == htons(ETH_P_IP)) {
		struct iphdr *iph = ip_hdr(skb);
		iph->tot_len = 0;
		iph->check = 0;
		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
		                                         0, IPPROTO_TCP, 0);
		cmd_length = E1000_TXD_CMD_IP;
		ipcse = skb_transport_offset(skb) - 1;
	} else if (skb_is_gso_v6(skb)) {
		ipv6_hdr(skb)->payload_len = 0;
		tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
		                                       &ipv6_hdr(skb)->daddr,
		                                       0, IPPROTO_TCP, 0);
		ipcse = 0;
	}
	ipcss = skb_network_offset(skb);
	ipcso = (void *)&(ip_hdr(skb)->check) - (void *)skb->data;
	tucss = skb_transport_offset(skb);
	tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;

	cmd_length |= (E1000_TXD_CMD_DEXT | E1000_TXD_CMD_TSE |
	               E1000_TXD_CMD_TCP | (skb->len - (hdr_len)));

	i = tx_ring->next_to_use;
	context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
	buffer_info = &tx_ring->buffer_info[i];

	context_desc->lower_setup.ip_fields.ipcss  = ipcss;
	context_desc->lower_setup.ip_fields.ipcso  = ipcso;
	context_desc->lower_setup.ip_fields.ipcse  = cpu_to_le16(ipcse);
	context_desc->upper_setup.tcp_fields.tucss = tucss;
	context_desc->upper_setup.tcp_fields.tucso = tucso;
	context_desc->upper_setup.tcp_fields.tucse = 0;
	context_desc->tcp_seg_setup.fields.mss     = cpu_to_le16(mss);
	context_desc->tcp_seg_setup.fields.hdr_len = hdr_len;
	context_desc->cmd_and_length = cpu_to_le32(cmd_length);

	buffer_info->time_stamp = jiffies;
	buffer_info->next_to_watch = i;

	i++;
	if (i == tx_ring->count)
		i = 0;
	tx_ring->next_to_use = i;

	return 1;
}

static bool e1000_tx_csum(struct e1000_ring *tx_ring, struct sk_buff *skb)
{
	struct e1000_adapter *adapter = tx_ring->adapter;
	struct e1000_context_desc *context_desc;
	struct e1000_buffer *buffer_info;
	unsigned int i;
	u8 css;
	u32 cmd_len = E1000_TXD_CMD_DEXT;
	__be16 protocol;

	if (skb->ip_summed != CHECKSUM_PARTIAL)
		return 0;

	if (skb->protocol == cpu_to_be16(ETH_P_8021Q))
		protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
	else
		protocol = skb->protocol;

	switch (protocol) {
	case cpu_to_be16(ETH_P_IP):
		if (ip_hdr(skb)->protocol == IPPROTO_TCP)
			cmd_len |= E1000_TXD_CMD_TCP;
		break;
	case cpu_to_be16(ETH_P_IPV6):
		/* XXX not handling all IPV6 headers */
		if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
			cmd_len |= E1000_TXD_CMD_TCP;
		break;
	default:
		if (unlikely(net_ratelimit()))
			e_warn("checksum_partial proto=%x!\n",
			       be16_to_cpu(protocol));
		break;
	}

	css = skb_checksum_start_offset(skb);

	i = tx_ring->next_to_use;
	buffer_info = &tx_ring->buffer_info[i];
	context_desc = E1000_CONTEXT_DESC(*tx_ring, i);

	context_desc->lower_setup.ip_config = 0;
	context_desc->upper_setup.tcp_fields.tucss = css;
	context_desc->upper_setup.tcp_fields.tucso =
				css + skb->csum_offset;
	context_desc->upper_setup.tcp_fields.tucse = 0;
	context_desc->tcp_seg_setup.data = 0;
	context_desc->cmd_and_length = cpu_to_le32(cmd_len);

	buffer_info->time_stamp = jiffies;
	buffer_info->next_to_watch = i;

	i++;
	if (i == tx_ring->count)
		i = 0;
	tx_ring->next_to_use = i;

	return 1;
}

static int e1000_tx_map(struct e1000_ring *tx_ring, struct sk_buff *skb,
			unsigned int first, unsigned int max_per_txd,
			unsigned int nr_frags)
{
	struct e1000_adapter *adapter = tx_ring->adapter;
	struct pci_dev *pdev = adapter->pdev;
	struct e1000_buffer *buffer_info;
	unsigned int len = skb_headlen(skb);
	unsigned int offset = 0, size, count = 0, i;
	unsigned int f, bytecount, segs;

	i = tx_ring->next_to_use;

	while (len) {
		buffer_info = &tx_ring->buffer_info[i];
		size = min(len, max_per_txd);

		buffer_info->length = size;
		buffer_info->time_stamp = jiffies;
		buffer_info->next_to_watch = i;
		buffer_info->dma = dma_map_single(&pdev->dev,
						  skb->data + offset,
						  size, DMA_TO_DEVICE);
		buffer_info->mapped_as_page = false;
		if (dma_mapping_error(&pdev->dev, buffer_info->dma))
			goto dma_error;

		len -= size;
		offset += size;
		count++;

		if (len) {
			i++;
			if (i == tx_ring->count)
				i = 0;
		}
	}

	for (f = 0; f < nr_frags; f++) {
		const struct skb_frag_struct *frag;

		frag = &skb_shinfo(skb)->frags[f];
		len = skb_frag_size(frag);
		offset = 0;

		while (len) {
			i++;
			if (i == tx_ring->count)
				i = 0;

			buffer_info = &tx_ring->buffer_info[i];
			size = min(len, max_per_txd);

			buffer_info->length = size;
			buffer_info->time_stamp = jiffies;
			buffer_info->next_to_watch = i;
			buffer_info->dma = skb_frag_dma_map(&pdev->dev, frag,
						offset, size, DMA_TO_DEVICE);
			buffer_info->mapped_as_page = true;
			if (dma_mapping_error(&pdev->dev, buffer_info->dma))
				goto dma_error;

			len -= size;
			offset += size;
			count++;
		}
	}

	segs = skb_shinfo(skb)->gso_segs ? : 1;
	/* multiply data chunks by size of headers */
	bytecount = ((segs - 1) * skb_headlen(skb)) + skb->len;

	tx_ring->buffer_info[i].skb = skb;
	tx_ring->buffer_info[i].segs = segs;
	tx_ring->buffer_info[i].bytecount = bytecount;
	tx_ring->buffer_info[first].next_to_watch = i;

	return count;

dma_error:
	dev_err(&pdev->dev, "Tx DMA map failed\n");
	buffer_info->dma = 0;
	if (count)
		count--;

	while (count--) {
		if (i == 0)
			i += tx_ring->count;
		i--;
		buffer_info = &tx_ring->buffer_info[i];
		e1000_put_txbuf(tx_ring, buffer_info);
	}

	return 0;
}

static void e1000_tx_queue(struct e1000_ring *tx_ring, int tx_flags, int count)
{
	struct e1000_adapter *adapter = tx_ring->adapter;
	struct e1000_tx_desc *tx_desc = NULL;
	struct e1000_buffer *buffer_info;
	u32 txd_upper = 0, txd_lower = E1000_TXD_CMD_IFCS;
	unsigned int i;

	if (tx_flags & E1000_TX_FLAGS_TSO) {
		txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D |
			     E1000_TXD_CMD_TSE;
		txd_upper |= E1000_TXD_POPTS_TXSM << 8;

		if (tx_flags & E1000_TX_FLAGS_IPV4)
			txd_upper |= E1000_TXD_POPTS_IXSM << 8;
	}

	if (tx_flags & E1000_TX_FLAGS_CSUM) {
		txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D;
		txd_upper |= E1000_TXD_POPTS_TXSM << 8;
	}

	if (tx_flags & E1000_TX_FLAGS_VLAN) {
		txd_lower |= E1000_TXD_CMD_VLE;
		txd_upper |= (tx_flags & E1000_TX_FLAGS_VLAN_MASK);
	}

	if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
		txd_lower &= ~(E1000_TXD_CMD_IFCS);

	if (unlikely(tx_flags & E1000_TX_FLAGS_HWTSTAMP)) {
		txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D;
		txd_upper |= E1000_TXD_EXTCMD_TSTAMP;
	}

	i = tx_ring->next_to_use;

	do {
		buffer_info = &tx_ring->buffer_info[i];
		tx_desc = E1000_TX_DESC(*tx_ring, i);
		tx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
		tx_desc->lower.data =
			cpu_to_le32(txd_lower | buffer_info->length);
		tx_desc->upper.data = cpu_to_le32(txd_upper);

		i++;
		if (i == tx_ring->count)
			i = 0;
	} while (--count > 0);

	tx_desc->lower.data |= cpu_to_le32(adapter->txd_cmd);

	/* txd_cmd re-enables FCS, so we'll re-disable it here as desired. */
	if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
		tx_desc->lower.data &= ~(cpu_to_le32(E1000_TXD_CMD_IFCS));

	/* Force memory writes to complete before letting h/w
	 * know there are new descriptors to fetch.  (Only
	 * applicable for weak-ordered memory model archs,
	 * such as IA-64).
	 */
	wmb();

	tx_ring->next_to_use = i;

	if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA)
		e1000e_update_tdt_wa(tx_ring, i);
	else
		writel(i, tx_ring->tail);

	/* we need this if more than one processor can write to our tail
	 * at a time, it synchronizes IO on IA64/Altix systems
	 */
	mmiowb();
}

#define MINIMUM_DHCP_PACKET_SIZE 282
static int e1000_transfer_dhcp_info(struct e1000_adapter *adapter,
				    struct sk_buff *skb)
{
	struct e1000_hw *hw =  &adapter->hw;
	u16 length, offset;

	if (vlan_tx_tag_present(skb) &&
	    !((vlan_tx_tag_get(skb) == adapter->hw.mng_cookie.vlan_id) &&
	      (adapter->hw.mng_cookie.status &
	       E1000_MNG_DHCP_COOKIE_STATUS_VLAN)))
		return 0;

	if (skb->len <= MINIMUM_DHCP_PACKET_SIZE)
		return 0;

	if (((struct ethhdr *) skb->data)->h_proto != htons(ETH_P_IP))
		return 0;

	{
		const struct iphdr *ip = (struct iphdr *)((u8 *)skb->data+14);
		struct udphdr *udp;

		if (ip->protocol != IPPROTO_UDP)
			return 0;

		udp = (struct udphdr *)((u8 *)ip + (ip->ihl << 2));
		if (ntohs(udp->dest) != 67)
			return 0;

		offset = (u8 *)udp + 8 - skb->data;
		length = skb->len - offset;
		return e1000e_mng_write_dhcp_info(hw, (u8 *)udp + 8, length);
	}

	return 0;
}

static int __e1000_maybe_stop_tx(struct e1000_ring *tx_ring, int size)
{
	struct e1000_adapter *adapter = tx_ring->adapter;

	netif_stop_queue(adapter->netdev);
	/* Herbert's original patch had:
	 *  smp_mb__after_netif_stop_queue();
	 * but since that doesn't exist yet, just open code it.
	 */
	smp_mb();

	/* We need to check again in a case another CPU has just
	 * made room available.
	 */
	if (e1000_desc_unused(tx_ring) < size)
		return -EBUSY;

	/* A reprieve! */
	netif_start_queue(adapter->netdev);
	++adapter->restart_queue;
	return 0;
}

static int e1000_maybe_stop_tx(struct e1000_ring *tx_ring, int size)
{
	BUG_ON(size > tx_ring->count);

	if (e1000_desc_unused(tx_ring) >= size)
		return 0;
	return __e1000_maybe_stop_tx(tx_ring, size);
}

static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
				    struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_ring *tx_ring = adapter->tx_ring;
	unsigned int first;
	unsigned int tx_flags = 0;
	unsigned int len = skb_headlen(skb);
	unsigned int nr_frags;
	unsigned int mss;
	int count = 0;
	int tso;
	unsigned int f;

	if (test_bit(__E1000_DOWN, &adapter->state)) {
		dev_kfree_skb_any(skb);
		return NETDEV_TX_OK;
	}

	if (skb->len <= 0) {
		dev_kfree_skb_any(skb);
		return NETDEV_TX_OK;
	}

	/* The minimum packet size with TCTL.PSP set is 17 bytes so
	 * pad skb in order to meet this minimum size requirement
	 */
	if (unlikely(skb->len < 17)) {
		if (skb_pad(skb, 17 - skb->len))
			return NETDEV_TX_OK;
		skb->len = 17;
		skb_set_tail_pointer(skb, 17);
	}

	mss = skb_shinfo(skb)->gso_size;
	if (mss) {
		u8 hdr_len;

		/* TSO Workaround for 82571/2/3 Controllers -- if skb->data
		 * points to just header, pull a few bytes of payload from
		 * frags into skb->data
		 */
		hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
		/* we do this workaround for ES2LAN, but it is un-necessary,
		 * avoiding it could save a lot of cycles
		 */
		if (skb->data_len && (hdr_len == len)) {
			unsigned int pull_size;

			pull_size = min_t(unsigned int, 4, skb->data_len);
			if (!__pskb_pull_tail(skb, pull_size)) {
				e_err("__pskb_pull_tail failed.\n");
				dev_kfree_skb_any(skb);
				return NETDEV_TX_OK;
			}
			len = skb_headlen(skb);
		}
	}

	/* reserve a descriptor for the offload context */
	if ((mss) || (skb->ip_summed == CHECKSUM_PARTIAL))
		count++;
	count++;

	count += DIV_ROUND_UP(len, adapter->tx_fifo_limit);

	nr_frags = skb_shinfo(skb)->nr_frags;
	for (f = 0; f < nr_frags; f++)
		count += DIV_ROUND_UP(skb_frag_size(&skb_shinfo(skb)->frags[f]),
				      adapter->tx_fifo_limit);

	if (adapter->hw.mac.tx_pkt_filtering)
		e1000_transfer_dhcp_info(adapter, skb);

	/* need: count + 2 desc gap to keep tail from touching
	 * head, otherwise try next time
	 */
	if (e1000_maybe_stop_tx(tx_ring, count + 2))
		return NETDEV_TX_BUSY;

	if (vlan_tx_tag_present(skb)) {
		tx_flags |= E1000_TX_FLAGS_VLAN;
		tx_flags |= (vlan_tx_tag_get(skb) << E1000_TX_FLAGS_VLAN_SHIFT);
	}

	first = tx_ring->next_to_use;

	tso = e1000_tso(tx_ring, skb);
	if (tso < 0) {
		dev_kfree_skb_any(skb);
		return NETDEV_TX_OK;
	}

	if (tso)
		tx_flags |= E1000_TX_FLAGS_TSO;
	else if (e1000_tx_csum(tx_ring, skb))
		tx_flags |= E1000_TX_FLAGS_CSUM;

	/* Old method was to assume IPv4 packet by default if TSO was enabled.
	 * 82571 hardware supports TSO capabilities for IPv6 as well...
	 * no longer assume, we must.
	 */
	if (skb->protocol == htons(ETH_P_IP))
		tx_flags |= E1000_TX_FLAGS_IPV4;

	if (unlikely(skb->no_fcs))
		tx_flags |= E1000_TX_FLAGS_NO_FCS;

	/* if count is 0 then mapping error has occurred */
	count = e1000_tx_map(tx_ring, skb, first, adapter->tx_fifo_limit,
			     nr_frags);
	if (count) {
		if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
			     !adapter->tx_hwtstamp_skb)) {
			skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
			tx_flags |= E1000_TX_FLAGS_HWTSTAMP;
			adapter->tx_hwtstamp_skb = skb_get(skb);
			schedule_work(&adapter->tx_hwtstamp_work);
		} else {
			skb_tx_timestamp(skb);
		}

		netdev_sent_queue(netdev, skb->len);
		e1000_tx_queue(tx_ring, tx_flags, count);
		/* Make sure there is space in the ring for the next send. */
		e1000_maybe_stop_tx(tx_ring,
				    (MAX_SKB_FRAGS *
				     DIV_ROUND_UP(PAGE_SIZE,
						  adapter->tx_fifo_limit) + 2));
	} else {
		dev_kfree_skb_any(skb);
		tx_ring->buffer_info[first].time_stamp = 0;
		tx_ring->next_to_use = first;
	}

	return NETDEV_TX_OK;
}

/**
 * e1000_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 **/
static void e1000_tx_timeout(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);

	/* Do the reset outside of interrupt context */
	adapter->tx_timeout_count++;
	schedule_work(&adapter->reset_task);
}

static void e1000_reset_task(struct work_struct *work)
{
	struct e1000_adapter *adapter;
	adapter = container_of(work, struct e1000_adapter, reset_task);

	/* don't run the task if already down */
	if (test_bit(__E1000_DOWN, &adapter->state))
		return;

	if (!(adapter->flags & FLAG_RESTART_NOW)) {
		e1000e_dump(adapter);
		e_err("Reset adapter unexpectedly\n");
	}
	e1000e_reinit_locked(adapter);
}

/**
 * e1000_get_stats64 - Get System Network Statistics
 * @netdev: network interface device structure
 * @stats: rtnl_link_stats64 pointer
 *
 * Returns the address of the device statistics structure.
 **/
struct rtnl_link_stats64 *e1000e_get_stats64(struct net_device *netdev,
                                             struct rtnl_link_stats64 *stats)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);

	memset(stats, 0, sizeof(struct rtnl_link_stats64));
	spin_lock(&adapter->stats64_lock);
	e1000e_update_stats(adapter);
	/* Fill out the OS statistics structure */
	stats->rx_bytes = adapter->stats.gorc;
	stats->rx_packets = adapter->stats.gprc;
	stats->tx_bytes = adapter->stats.gotc;
	stats->tx_packets = adapter->stats.gptc;
	stats->multicast = adapter->stats.mprc;
	stats->collisions = adapter->stats.colc;

	/* Rx Errors */

	/* RLEC on some newer hardware can be incorrect so build
	 * our own version based on RUC and ROC
	 */
	stats->rx_errors = adapter->stats.rxerrc +
		adapter->stats.crcerrs + adapter->stats.algnerrc +
		adapter->stats.ruc + adapter->stats.roc +
		adapter->stats.cexterr;
	stats->rx_length_errors = adapter->stats.ruc +
					      adapter->stats.roc;
	stats->rx_crc_errors = adapter->stats.crcerrs;
	stats->rx_frame_errors = adapter->stats.algnerrc;
	stats->rx_missed_errors = adapter->stats.mpc;

	/* Tx Errors */
	stats->tx_errors = adapter->stats.ecol +
				       adapter->stats.latecol;
	stats->tx_aborted_errors = adapter->stats.ecol;
	stats->tx_window_errors = adapter->stats.latecol;
	stats->tx_carrier_errors = adapter->stats.tncrs;

	/* Tx Dropped needs to be maintained elsewhere */

	spin_unlock(&adapter->stats64_lock);
	return stats;
}

/**
 * e1000_change_mtu - Change the Maximum Transfer Unit
 * @netdev: network interface device structure
 * @new_mtu: new value for maximum frame size
 *
 * Returns 0 on success, negative on failure
 **/
static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;

	/* Jumbo frame support */
	if ((max_frame > ETH_FRAME_LEN + ETH_FCS_LEN) &&
	    !(adapter->flags & FLAG_HAS_JUMBO_FRAMES)) {
		e_err("Jumbo Frames not supported.\n");
		return -EINVAL;
	}

	/* Supported frame sizes */
	if ((new_mtu < ETH_ZLEN + ETH_FCS_LEN + VLAN_HLEN) ||
	    (max_frame > adapter->max_hw_frame_size)) {
		e_err("Unsupported MTU setting\n");
		return -EINVAL;
	}

	/* Jumbo frame workaround on 82579 and newer requires CRC be stripped */
	if ((adapter->hw.mac.type >= e1000_pch2lan) &&
	    !(adapter->flags2 & FLAG2_CRC_STRIPPING) &&
	    (new_mtu > ETH_DATA_LEN)) {
		e_err("Jumbo Frames not supported on this device when CRC stripping is disabled.\n");
		return -EINVAL;
	}

	while (test_and_set_bit(__E1000_RESETTING, &adapter->state))
		usleep_range(1000, 2000);
	/* e1000e_down -> e1000e_reset dependent on max_frame_size & mtu */
	adapter->max_frame_size = max_frame;
	e_info("changing MTU from %d to %d\n", netdev->mtu, new_mtu);
	netdev->mtu = new_mtu;
	if (netif_running(netdev))
		e1000e_down(adapter);

	/* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
	 * means we reserve 2 more, this pushes us to allocate from the next
	 * larger slab size.
	 * i.e. RXBUFFER_2048 --> size-4096 slab
	 * However with the new *_jumbo_rx* routines, jumbo receives will use
	 * fragmented skbs
	 */

	if (max_frame <= 2048)
		adapter->rx_buffer_len = 2048;
	else
		adapter->rx_buffer_len = 4096;

	/* adjust allocation if LPE protects us, and we aren't using SBP */
	if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN) ||
	     (max_frame == ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN))
		adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN
					 + ETH_FCS_LEN;

	if (netif_running(netdev))
		e1000e_up(adapter);
	else
		e1000e_reset(adapter);

	clear_bit(__E1000_RESETTING, &adapter->state);

	return 0;
}

static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
			   int cmd)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct mii_ioctl_data *data = if_mii(ifr);

	if (adapter->hw.phy.media_type != e1000_media_type_copper)
		return -EOPNOTSUPP;

	switch (cmd) {
	case SIOCGMIIPHY:
		data->phy_id = adapter->hw.phy.addr;
		break;
	case SIOCGMIIREG:
		e1000_phy_read_status(adapter);

		switch (data->reg_num & 0x1F) {
		case MII_BMCR:
			data->val_out = adapter->phy_regs.bmcr;
			break;
		case MII_BMSR:
			data->val_out = adapter->phy_regs.bmsr;
			break;
		case MII_PHYSID1:
			data->val_out = (adapter->hw.phy.id >> 16);
			break;
		case MII_PHYSID2:
			data->val_out = (adapter->hw.phy.id & 0xFFFF);
			break;
		case MII_ADVERTISE:
			data->val_out = adapter->phy_regs.advertise;
			break;
		case MII_LPA:
			data->val_out = adapter->phy_regs.lpa;
			break;
		case MII_EXPANSION:
			data->val_out = adapter->phy_regs.expansion;
			break;
		case MII_CTRL1000:
			data->val_out = adapter->phy_regs.ctrl1000;
			break;
		case MII_STAT1000:
			data->val_out = adapter->phy_regs.stat1000;
			break;
		case MII_ESTATUS:
			data->val_out = adapter->phy_regs.estatus;
			break;
		default:
			return -EIO;
		}
		break;
	case SIOCSMIIREG:
	default:
		return -EOPNOTSUPP;
	}
	return 0;
}

/**
 * e1000e_hwtstamp_ioctl - control hardware time stamping
 * @netdev: network interface device structure
 * @ifreq: interface request
 *
 * Outgoing time stamping can be enabled and disabled. Play nice and
 * disable it when requested, although it shouldn't cause any overhead
 * when no packet needs it. At most one packet in the queue may be
 * marked for time stamping, otherwise it would be impossible to tell
 * for sure to which packet the hardware time stamp belongs.
 *
 * Incoming time stamping has to be configured via the hardware filters.
 * Not all combinations are supported, in particular event type has to be
 * specified. Matching the kind of event packet is not supported, with the
 * exception of "all V2 events regardless of level 2 or 4".
 **/
static int e1000e_hwtstamp_ioctl(struct net_device *netdev, struct ifreq *ifr)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct hwtstamp_config config;
	int ret_val;

	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
		return -EFAULT;

	adapter->hwtstamp_config = config;

	ret_val = e1000e_config_hwtstamp(adapter);
	if (ret_val)
		return ret_val;

	config = adapter->hwtstamp_config;

	switch (config.rx_filter) {
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
		/* With V2 type filters which specify a Sync or Delay Request,
		 * Path Delay Request/Response messages are also time stamped
		 * by hardware so notify the caller the requested packets plus
		 * some others are time stamped.
		 */
		config.rx_filter = HWTSTAMP_FILTER_SOME;
		break;
	default:
		break;
	}

	return copy_to_user(ifr->ifr_data, &config,
			    sizeof(config)) ? -EFAULT : 0;
}

static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
	switch (cmd) {
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
		return e1000_mii_ioctl(netdev, ifr, cmd);
	case SIOCSHWTSTAMP:
		return e1000e_hwtstamp_ioctl(netdev, ifr);
	default:
		return -EOPNOTSUPP;
	}
}

static int e1000_init_phy_wakeup(struct e1000_adapter *adapter, u32 wufc)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 i, mac_reg;
	u16 phy_reg, wuc_enable;
	int retval;

	/* copy MAC RARs to PHY RARs */
	e1000_copy_rx_addrs_to_phy_ich8lan(hw);

	retval = hw->phy.ops.acquire(hw);
	if (retval) {
		e_err("Could not acquire PHY\n");
		return retval;
	}

	/* Enable access to wakeup registers on and set page to BM_WUC_PAGE */
	retval = e1000_enable_phy_wakeup_reg_access_bm(hw, &wuc_enable);
	if (retval)
		goto release;

	/* copy MAC MTA to PHY MTA - only needed for pchlan */
	for (i = 0; i < adapter->hw.mac.mta_reg_count; i++) {
		mac_reg = E1000_READ_REG_ARRAY(hw, E1000_MTA, i);
		hw->phy.ops.write_reg_page(hw, BM_MTA(i),
					   (u16)(mac_reg & 0xFFFF));
		hw->phy.ops.write_reg_page(hw, BM_MTA(i) + 1,
					   (u16)((mac_reg >> 16) & 0xFFFF));
	}

	/* configure PHY Rx Control register */
	hw->phy.ops.read_reg_page(&adapter->hw, BM_RCTL, &phy_reg);
	mac_reg = er32(RCTL);
	if (mac_reg & E1000_RCTL_UPE)
		phy_reg |= BM_RCTL_UPE;
	if (mac_reg & E1000_RCTL_MPE)
		phy_reg |= BM_RCTL_MPE;
	phy_reg &= ~(BM_RCTL_MO_MASK);
	if (mac_reg & E1000_RCTL_MO_3)
		phy_reg |= (((mac_reg & E1000_RCTL_MO_3) >> E1000_RCTL_MO_SHIFT)
				<< BM_RCTL_MO_SHIFT);
	if (mac_reg & E1000_RCTL_BAM)
		phy_reg |= BM_RCTL_BAM;
	if (mac_reg & E1000_RCTL_PMCF)
		phy_reg |= BM_RCTL_PMCF;
	mac_reg = er32(CTRL);
	if (mac_reg & E1000_CTRL_RFCE)
		phy_reg |= BM_RCTL_RFCE;
	hw->phy.ops.write_reg_page(&adapter->hw, BM_RCTL, phy_reg);

	/* enable PHY wakeup in MAC register */
	ew32(WUFC, wufc);
	ew32(WUC, E1000_WUC_PHY_WAKE | E1000_WUC_PME_EN);

	/* configure and enable PHY wakeup in PHY registers */
	hw->phy.ops.write_reg_page(&adapter->hw, BM_WUFC, wufc);
	hw->phy.ops.write_reg_page(&adapter->hw, BM_WUC, E1000_WUC_PME_EN);

	/* activate PHY wakeup */
	wuc_enable |= BM_WUC_ENABLE_BIT | BM_WUC_HOST_WU_BIT;
	retval = e1000_disable_phy_wakeup_reg_access_bm(hw, &wuc_enable);
	if (retval)
		e_err("Could not set PHY Host Wakeup bit\n");
release:
	hw->phy.ops.release(hw);

	return retval;
}

static int __e1000_shutdown(struct pci_dev *pdev, bool *enable_wake,
			    bool runtime)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u32 ctrl, ctrl_ext, rctl, status;
	/* Runtime suspend should only enable wakeup for link changes */
	u32 wufc = runtime ? E1000_WUFC_LNKC : adapter->wol;
	int retval = 0;

	netif_device_detach(netdev);

	if (netif_running(netdev)) {
		int count = E1000_CHECK_RESET_COUNT;

		while (test_bit(__E1000_RESETTING, &adapter->state) && count--)
			usleep_range(10000, 20000);

		WARN_ON(test_bit(__E1000_RESETTING, &adapter->state));
		e1000e_down(adapter);
		e1000_free_irq(adapter);
	}
	e1000e_reset_interrupt_capability(adapter);

	retval = pci_save_state(pdev);
	if (retval)
		return retval;

	status = er32(STATUS);
	if (status & E1000_STATUS_LU)
		wufc &= ~E1000_WUFC_LNKC;

	if (wufc) {
		e1000_setup_rctl(adapter);
		e1000e_set_rx_mode(netdev);

		/* turn on all-multi mode if wake on multicast is enabled */
		if (wufc & E1000_WUFC_MC) {
			rctl = er32(RCTL);
			rctl |= E1000_RCTL_MPE;
			ew32(RCTL, rctl);
		}

		ctrl = er32(CTRL);
		/* advertise wake from D3Cold */
		#define E1000_CTRL_ADVD3WUC 0x00100000
		/* phy power management enable */
		#define E1000_CTRL_EN_PHY_PWR_MGMT 0x00200000
		ctrl |= E1000_CTRL_ADVD3WUC;
		if (!(adapter->flags2 & FLAG2_HAS_PHY_WAKEUP))
			ctrl |= E1000_CTRL_EN_PHY_PWR_MGMT;
		ew32(CTRL, ctrl);

		if (adapter->hw.phy.media_type == e1000_media_type_fiber ||
		    adapter->hw.phy.media_type ==
		    e1000_media_type_internal_serdes) {
			/* keep the laser running in D3 */
			ctrl_ext = er32(CTRL_EXT);
			ctrl_ext |= E1000_CTRL_EXT_SDP3_DATA;
			ew32(CTRL_EXT, ctrl_ext);
		}

		if (adapter->flags & FLAG_IS_ICH)
			e1000_suspend_workarounds_ich8lan(&adapter->hw);

		/* Allow time for pending master requests to run */
		e1000e_disable_pcie_master(&adapter->hw);

		if (adapter->flags2 & FLAG2_HAS_PHY_WAKEUP) {
			/* enable wakeup by the PHY */
			retval = e1000_init_phy_wakeup(adapter, wufc);
			if (retval)
				return retval;
		} else {
			/* enable wakeup by the MAC */
			ew32(WUFC, wufc);
			ew32(WUC, E1000_WUC_PME_EN);
		}
	} else {
		ew32(WUC, 0);
		ew32(WUFC, 0);
	}

	*enable_wake = !!wufc;

	/* make sure adapter isn't asleep if manageability is enabled */
	if ((adapter->flags & FLAG_MNG_PT_ENABLED) ||
	    (hw->mac.ops.check_mng_mode(hw)))
		*enable_wake = true;

	if (adapter->hw.phy.type == e1000_phy_igp_3)
		e1000e_igp3_phy_powerdown_workaround_ich8lan(&adapter->hw);

	/* Release control of h/w to f/w.  If f/w is AMT enabled, this
	 * would have already happened in close and is redundant.
	 */
	e1000e_release_hw_control(adapter);

	pci_disable_device(pdev);

	return 0;
}

static void e1000_power_off(struct pci_dev *pdev, bool sleep, bool wake)
{
	if (sleep && wake) {
		pci_prepare_to_sleep(pdev);
		return;
	}

	pci_wake_from_d3(pdev, wake);
	pci_set_power_state(pdev, PCI_D3hot);
}

static void e1000_complete_shutdown(struct pci_dev *pdev, bool sleep,
                                    bool wake)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);

	/* The pci-e switch on some quad port adapters will report a
	 * correctable error when the MAC transitions from D0 to D3.  To
	 * prevent this we need to mask off the correctable errors on the
	 * downstream port of the pci-e switch.
	 */
	if (adapter->flags & FLAG_IS_QUAD_PORT) {
		struct pci_dev *us_dev = pdev->bus->self;
		u16 devctl;

		pcie_capability_read_word(us_dev, PCI_EXP_DEVCTL, &devctl);
		pcie_capability_write_word(us_dev, PCI_EXP_DEVCTL,
					   (devctl & ~PCI_EXP_DEVCTL_CERE));

		e1000_power_off(pdev, sleep, wake);

		pcie_capability_write_word(us_dev, PCI_EXP_DEVCTL, devctl);
	} else {
		e1000_power_off(pdev, sleep, wake);
	}
}

#ifdef CONFIG_PCIEASPM
static void __e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
{
	pci_disable_link_state_locked(pdev, state);
}
#else
static void __e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
{
	u16 aspm_ctl = 0;

	if (state & PCIE_LINK_STATE_L0S)
		aspm_ctl |= PCI_EXP_LNKCTL_ASPM_L0S;
	if (state & PCIE_LINK_STATE_L1)
		aspm_ctl |= PCI_EXP_LNKCTL_ASPM_L1;

	/* Both device and parent should have the same ASPM setting.
	 * Disable ASPM in downstream component first and then upstream.
	 */
	pcie_capability_clear_word(pdev, PCI_EXP_LNKCTL, aspm_ctl);

	if (pdev->bus->self)
		pcie_capability_clear_word(pdev->bus->self, PCI_EXP_LNKCTL,
					   aspm_ctl);
}
#endif
static void e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
{
	dev_info(&pdev->dev, "Disabling ASPM %s %s\n",
		 (state & PCIE_LINK_STATE_L0S) ? "L0s" : "",
		 (state & PCIE_LINK_STATE_L1) ? "L1" : "");

	__e1000e_disable_aspm(pdev, state);
}

#ifdef CONFIG_PM
static bool e1000e_pm_ready(struct e1000_adapter *adapter)
{
	return !!adapter->tx_ring->buffer_info;
}

static int __e1000_resume(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u16 aspm_disable_flag = 0;
	u32 err;

	if (adapter->flags2 & FLAG2_DISABLE_ASPM_L0S)
		aspm_disable_flag = PCIE_LINK_STATE_L0S;
	if (adapter->flags2 & FLAG2_DISABLE_ASPM_L1)
		aspm_disable_flag |= PCIE_LINK_STATE_L1;
	if (aspm_disable_flag)
		e1000e_disable_aspm(pdev, aspm_disable_flag);

	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
	pci_save_state(pdev);

	e1000e_set_interrupt_capability(adapter);
	if (netif_running(netdev)) {
		err = e1000_request_irq(adapter);
		if (err)
			return err;
	}

	if (hw->mac.type >= e1000_pch2lan)
		e1000_resume_workarounds_pchlan(&adapter->hw);

	e1000e_power_up_phy(adapter);

	/* report the system wakeup cause from S3/S4 */
	if (adapter->flags2 & FLAG2_HAS_PHY_WAKEUP) {
		u16 phy_data;

		e1e_rphy(&adapter->hw, BM_WUS, &phy_data);
		if (phy_data) {
			e_info("PHY Wakeup cause - %s\n",
				phy_data & E1000_WUS_EX ? "Unicast Packet" :
				phy_data & E1000_WUS_MC ? "Multicast Packet" :
				phy_data & E1000_WUS_BC ? "Broadcast Packet" :
				phy_data & E1000_WUS_MAG ? "Magic Packet" :
				phy_data & E1000_WUS_LNKC ?
				"Link Status Change" : "other");
		}
		e1e_wphy(&adapter->hw, BM_WUS, ~0);
	} else {
		u32 wus = er32(WUS);
		if (wus) {
			e_info("MAC Wakeup cause - %s\n",
				wus & E1000_WUS_EX ? "Unicast Packet" :
				wus & E1000_WUS_MC ? "Multicast Packet" :
				wus & E1000_WUS_BC ? "Broadcast Packet" :
				wus & E1000_WUS_MAG ? "Magic Packet" :
				wus & E1000_WUS_LNKC ? "Link Status Change" :
				"other");
		}
		ew32(WUS, ~0);
	}

	e1000e_reset(adapter);

	e1000_init_manageability_pt(adapter);

	if (netif_running(netdev))
		e1000e_up(adapter);

	netif_device_attach(netdev);

	/* If the controller has AMT, do not set DRV_LOAD until the interface
	 * is up.  For all other cases, let the f/w know that the h/w is now
	 * under the control of the driver.
	 */
	if (!(adapter->flags & FLAG_HAS_AMT))
		e1000e_get_hw_control(adapter);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int e1000_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	int retval;
	bool wake;

	retval = __e1000_shutdown(pdev, &wake, false);
	if (!retval)
		e1000_complete_shutdown(pdev, true, wake);

	return retval;
}

static int e1000_resume(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);

	if (e1000e_pm_ready(adapter))
		adapter->idle_check = true;

	return __e1000_resume(pdev);
}
#endif /* CONFIG_PM_SLEEP */

#ifdef CONFIG_PM_RUNTIME
static int e1000_runtime_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);

	if (e1000e_pm_ready(adapter)) {
		bool wake;

		__e1000_shutdown(pdev, &wake, true);
	}

	return 0;
}

static int e1000_idle(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);

	if (!e1000e_pm_ready(adapter))
		return 0;

	if (adapter->idle_check) {
		adapter->idle_check = false;
		if (!e1000e_has_link(adapter))
			pm_schedule_suspend(dev, MSEC_PER_SEC);
	}

	return -EBUSY;
}

static int e1000_runtime_resume(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);

	if (!e1000e_pm_ready(adapter))
		return 0;

	adapter->idle_check = !dev->power.runtime_auto;
	return __e1000_resume(pdev);
}
#endif /* CONFIG_PM_RUNTIME */
#endif /* CONFIG_PM */

static void e1000_shutdown(struct pci_dev *pdev)
{
	bool wake = false;

	__e1000_shutdown(pdev, &wake, false);

	if (system_state == SYSTEM_POWER_OFF)
		e1000_complete_shutdown(pdev, false, wake);
}

#ifdef CONFIG_NET_POLL_CONTROLLER

static irqreturn_t e1000_intr_msix(int irq, void *data)
{
	struct net_device *netdev = data;
	struct e1000_adapter *adapter = netdev_priv(netdev);

	if (adapter->msix_entries) {
		int vector, msix_irq;

		vector = 0;
		msix_irq = adapter->msix_entries[vector].vector;
		disable_irq(msix_irq);
		e1000_intr_msix_rx(msix_irq, netdev);
		enable_irq(msix_irq);

		vector++;
		msix_irq = adapter->msix_entries[vector].vector;
		disable_irq(msix_irq);
		e1000_intr_msix_tx(msix_irq, netdev);
		enable_irq(msix_irq);

		vector++;
		msix_irq = adapter->msix_entries[vector].vector;
		disable_irq(msix_irq);
		e1000_msix_other(msix_irq, netdev);
		enable_irq(msix_irq);
	}

	return IRQ_HANDLED;
}

/**
 * e1000_netpoll
 * @netdev: network interface device structure
 *
 * Polling 'interrupt' - used by things like netconsole to send skbs
 * without having to re-enable interrupts. It's not called while
 * the interrupt routine is executing.
 */
static void e1000_netpoll(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);

	switch (adapter->int_mode) {
	case E1000E_INT_MODE_MSIX:
		e1000_intr_msix(adapter->pdev->irq, netdev);
		break;
	case E1000E_INT_MODE_MSI:
		disable_irq(adapter->pdev->irq);
		e1000_intr_msi(adapter->pdev->irq, netdev);
		enable_irq(adapter->pdev->irq);
		break;
	default: /* E1000E_INT_MODE_LEGACY */
		disable_irq(adapter->pdev->irq);
		e1000_intr(adapter->pdev->irq, netdev);
		enable_irq(adapter->pdev->irq);
		break;
	}
}
#endif

/**
 * e1000_io_error_detected - called when PCI error is detected
 * @pdev: Pointer to PCI device
 * @state: The current pci connection state
 *
 * This function is called after a PCI bus error affecting
 * this device has been detected.
 */
static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
						pci_channel_state_t state)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);

	netif_device_detach(netdev);

	if (state == pci_channel_io_perm_failure)
		return PCI_ERS_RESULT_DISCONNECT;

	if (netif_running(netdev))
		e1000e_down(adapter);
	pci_disable_device(pdev);

	/* Request a slot slot reset. */
	return PCI_ERS_RESULT_NEED_RESET;
}

/**
 * e1000_io_slot_reset - called after the pci bus has been reset.
 * @pdev: Pointer to PCI device
 *
 * Restart the card from scratch, as if from a cold-boot. Implementation
 * resembles the first-half of the e1000_resume routine.
 */
static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	u16 aspm_disable_flag = 0;
	int err;
	pci_ers_result_t result;

	if (adapter->flags2 & FLAG2_DISABLE_ASPM_L0S)
		aspm_disable_flag = PCIE_LINK_STATE_L0S;
	if (adapter->flags2 & FLAG2_DISABLE_ASPM_L1)
		aspm_disable_flag |= PCIE_LINK_STATE_L1;
	if (aspm_disable_flag)
		e1000e_disable_aspm(pdev, aspm_disable_flag);

	err = pci_enable_device_mem(pdev);
	if (err) {
		dev_err(&pdev->dev,
			"Cannot re-enable PCI device after reset.\n");
		result = PCI_ERS_RESULT_DISCONNECT;
	} else {
		pci_set_master(pdev);
		pdev->state_saved = true;
		pci_restore_state(pdev);

		pci_enable_wake(pdev, PCI_D3hot, 0);
		pci_enable_wake(pdev, PCI_D3cold, 0);

		e1000e_reset(adapter);
		ew32(WUS, ~0);
		result = PCI_ERS_RESULT_RECOVERED;
	}

	pci_cleanup_aer_uncorrect_error_status(pdev);

	return result;
}

/**
 * e1000_io_resume - called when traffic can start flowing again.
 * @pdev: Pointer to PCI device
 *
 * This callback is called when the error recovery driver tells us that
 * its OK to resume normal operation. Implementation resembles the
 * second-half of the e1000_resume routine.
 */
static void e1000_io_resume(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);

	e1000_init_manageability_pt(adapter);

	if (netif_running(netdev)) {
		if (e1000e_up(adapter)) {
			dev_err(&pdev->dev,
				"can't bring device back up after reset\n");
			return;
		}
	}

	netif_device_attach(netdev);

	/* If the controller has AMT, do not set DRV_LOAD until the interface
	 * is up.  For all other cases, let the f/w know that the h/w is now
	 * under the control of the driver.
	 */
	if (!(adapter->flags & FLAG_HAS_AMT))
		e1000e_get_hw_control(adapter);

}

static void e1000_print_device_info(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	struct net_device *netdev = adapter->netdev;
	u32 ret_val;
	u8 pba_str[E1000_PBANUM_LENGTH];

	/* print bus type/speed/width info */
	e_info("(PCI Express:2.5GT/s:%s) %pM\n",
	       /* bus width */
	       ((hw->bus.width == e1000_bus_width_pcie_x4) ? "Width x4" :
	        "Width x1"),
	       /* MAC address */
	       netdev->dev_addr);
	e_info("Intel(R) PRO/%s Network Connection\n",
	       (hw->phy.type == e1000_phy_ife) ? "10/100" : "1000");
	ret_val = e1000_read_pba_string_generic(hw, pba_str,
						E1000_PBANUM_LENGTH);
	if (ret_val)
		strlcpy((char *)pba_str, "Unknown", sizeof(pba_str));
	e_info("MAC: %d, PHY: %d, PBA No: %s\n",
	       hw->mac.type, hw->phy.type, pba_str);
}

static void e1000_eeprom_checks(struct e1000_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	int ret_val;
	u16 buf = 0;

	if (hw->mac.type != e1000_82573)
		return;

	ret_val = e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &buf);
	le16_to_cpus(&buf);
	if (!ret_val && (!(buf & (1 << 0)))) {
		/* Deep Smart Power Down (DSPD) */
		dev_warn(&adapter->pdev->dev,
			 "Warning: detected DSPD enabled in EEPROM\n");
	}
}

static int e1000_set_features(struct net_device *netdev,
			      netdev_features_t features)
{
	struct e1000_adapter *adapter = netdev_priv(netdev);
	netdev_features_t changed = features ^ netdev->features;

	if (changed & (NETIF_F_TSO | NETIF_F_TSO6))
		adapter->flags |= FLAG_TSO_FORCE;

	if (!(changed & (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX |
			 NETIF_F_RXCSUM | NETIF_F_RXHASH | NETIF_F_RXFCS |
			 NETIF_F_RXALL)))
		return 0;

	if (changed & NETIF_F_RXFCS) {
		if (features & NETIF_F_RXFCS) {
			adapter->flags2 &= ~FLAG2_CRC_STRIPPING;
		} else {
			/* We need to take it back to defaults, which might mean
			 * stripping is still disabled at the adapter level.
			 */
			if (adapter->flags2 & FLAG2_DFLT_CRC_STRIPPING)
				adapter->flags2 |= FLAG2_CRC_STRIPPING;
			else
				adapter->flags2 &= ~FLAG2_CRC_STRIPPING;
		}
	}

	netdev->features = features;

	if (netif_running(netdev))
		e1000e_reinit_locked(adapter);
	else
		e1000e_reset(adapter);

	return 0;
}

static const struct net_device_ops e1000e_netdev_ops = {
	.ndo_open		= e1000_open,
	.ndo_stop		= e1000_close,
	.ndo_start_xmit		= e1000_xmit_frame,
	.ndo_get_stats64	= e1000e_get_stats64,
	.ndo_set_rx_mode	= e1000e_set_rx_mode,
	.ndo_set_mac_address	= e1000_set_mac,
	.ndo_change_mtu		= e1000_change_mtu,
	.ndo_do_ioctl		= e1000_ioctl,
	.ndo_tx_timeout		= e1000_tx_timeout,
	.ndo_validate_addr	= eth_validate_addr,

	.ndo_vlan_rx_add_vid	= e1000_vlan_rx_add_vid,
	.ndo_vlan_rx_kill_vid	= e1000_vlan_rx_kill_vid,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= e1000_netpoll,
#endif
	.ndo_set_features = e1000_set_features,
};

/**
 * e1000_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in e1000_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * e1000_probe initializes an adapter identified by a pci_dev structure.
 * The OS initialization, configuring of the adapter private structure,
 * and a hardware reset occur.
 **/
static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct net_device *netdev;
	struct e1000_adapter *adapter;
	struct e1000_hw *hw;
	const struct e1000_info *ei = e1000_info_tbl[ent->driver_data];
	resource_size_t mmio_start, mmio_len;
	resource_size_t flash_start, flash_len;
	static int cards_found;
	u16 aspm_disable_flag = 0;
	int i, err, pci_using_dac;
	u16 eeprom_data = 0;
	u16 eeprom_apme_mask = E1000_EEPROM_APME;

	if (ei->flags2 & FLAG2_DISABLE_ASPM_L0S)
		aspm_disable_flag = PCIE_LINK_STATE_L0S;
	if (ei->flags2 & FLAG2_DISABLE_ASPM_L1)
		aspm_disable_flag |= PCIE_LINK_STATE_L1;
	if (aspm_disable_flag)
		e1000e_disable_aspm(pdev, aspm_disable_flag);

	err = pci_enable_device_mem(pdev);
	if (err)
		return err;

	pci_using_dac = 0;
	err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
	if (!err) {
		err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
		if (!err)
			pci_using_dac = 1;
	} else {
		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
		if (err) {
			err = dma_set_coherent_mask(&pdev->dev,
						    DMA_BIT_MASK(32));
			if (err) {
				dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
				goto err_dma;
			}
		}
	}

	err = pci_request_selected_regions_exclusive(pdev,
	                                  pci_select_bars(pdev, IORESOURCE_MEM),
	                                  e1000e_driver_name);
	if (err)
		goto err_pci_reg;

	/* AER (Advanced Error Reporting) hooks */
	pci_enable_pcie_error_reporting(pdev);

	pci_set_master(pdev);
	/* PCI config space info */
	err = pci_save_state(pdev);
	if (err)
		goto err_alloc_etherdev;

	err = -ENOMEM;
	netdev = alloc_etherdev(sizeof(struct e1000_adapter));
	if (!netdev)
		goto err_alloc_etherdev;

	SET_NETDEV_DEV(netdev, &pdev->dev);

	netdev->irq = pdev->irq;

	pci_set_drvdata(pdev, netdev);
	adapter = netdev_priv(netdev);
	hw = &adapter->hw;
	adapter->netdev = netdev;
	adapter->pdev = pdev;
	adapter->ei = ei;
	adapter->pba = ei->pba;
	adapter->flags = ei->flags;
	adapter->flags2 = ei->flags2;
	adapter->hw.adapter = adapter;
	adapter->hw.mac.type = ei->mac;
	adapter->max_hw_frame_size = ei->max_hw_frame_size;
	adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);

	mmio_start = pci_resource_start(pdev, 0);
	mmio_len = pci_resource_len(pdev, 0);

	err = -EIO;
	adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
	if (!adapter->hw.hw_addr)
		goto err_ioremap;

	if ((adapter->flags & FLAG_HAS_FLASH) &&
	    (pci_resource_flags(pdev, 1) & IORESOURCE_MEM)) {
		flash_start = pci_resource_start(pdev, 1);
		flash_len = pci_resource_len(pdev, 1);
		adapter->hw.flash_address = ioremap(flash_start, flash_len);
		if (!adapter->hw.flash_address)
			goto err_flashmap;
	}

	/* construct the net_device struct */
	netdev->netdev_ops		= &e1000e_netdev_ops;
	e1000e_set_ethtool_ops(netdev);
	netdev->watchdog_timeo		= 5 * HZ;
	netif_napi_add(netdev, &adapter->napi, e1000e_poll, 64);
	strlcpy(netdev->name, pci_name(pdev), sizeof(netdev->name));

	netdev->mem_start = mmio_start;
	netdev->mem_end = mmio_start + mmio_len;

	adapter->bd_number = cards_found++;

	e1000e_check_options(adapter);

	/* setup adapter struct */
	err = e1000_sw_init(adapter);
	if (err)
		goto err_sw_init;

	memcpy(&hw->mac.ops, ei->mac_ops, sizeof(hw->mac.ops));
	memcpy(&hw->nvm.ops, ei->nvm_ops, sizeof(hw->nvm.ops));
	memcpy(&hw->phy.ops, ei->phy_ops, sizeof(hw->phy.ops));

	err = ei->get_variants(adapter);
	if (err)
		goto err_hw_init;

	if ((adapter->flags & FLAG_IS_ICH) &&
	    (adapter->flags & FLAG_READ_ONLY_NVM))
		e1000e_write_protect_nvm_ich8lan(&adapter->hw);

	hw->mac.ops.get_bus_info(&adapter->hw);

	adapter->hw.phy.autoneg_wait_to_complete = 0;

	/* Copper options */
	if (adapter->hw.phy.media_type == e1000_media_type_copper) {
		adapter->hw.phy.mdix = AUTO_ALL_MODES;
		adapter->hw.phy.disable_polarity_correction = 0;
		adapter->hw.phy.ms_type = e1000_ms_hw_default;
	}

	if (hw->phy.ops.check_reset_block && hw->phy.ops.check_reset_block(hw))
		dev_info(&pdev->dev,
			 "PHY reset is blocked due to SOL/IDER session.\n");

	/* Set initial default active device features */
	netdev->features = (NETIF_F_SG |
			    NETIF_F_HW_VLAN_RX |
			    NETIF_F_HW_VLAN_TX |
			    NETIF_F_TSO |
			    NETIF_F_TSO6 |
			    NETIF_F_RXHASH |
			    NETIF_F_RXCSUM |
			    NETIF_F_HW_CSUM);

	/* Set user-changeable features (subset of all device features) */
	netdev->hw_features = netdev->features;
	netdev->hw_features |= NETIF_F_RXFCS;
	netdev->priv_flags |= IFF_SUPP_NOFCS;
	netdev->hw_features |= NETIF_F_RXALL;

	if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER)
		netdev->features |= NETIF_F_HW_VLAN_FILTER;

	netdev->vlan_features |= (NETIF_F_SG |
				  NETIF_F_TSO |
				  NETIF_F_TSO6 |
				  NETIF_F_HW_CSUM);

	netdev->priv_flags |= IFF_UNICAST_FLT;

	if (pci_using_dac) {
		netdev->features |= NETIF_F_HIGHDMA;
		netdev->vlan_features |= NETIF_F_HIGHDMA;
	}

	if (e1000e_enable_mng_pass_thru(&adapter->hw))
		adapter->flags |= FLAG_MNG_PT_ENABLED;

	/* before reading the NVM, reset the controller to
	 * put the device in a known good starting state
	 */
	adapter->hw.mac.ops.reset_hw(&adapter->hw);

	/* systems with ASPM and others may see the checksum fail on the first
	 * attempt. Let's give it a few tries
	 */
	for (i = 0;; i++) {
		if (e1000_validate_nvm_checksum(&adapter->hw) >= 0)
			break;
		if (i == 2) {
			dev_err(&pdev->dev, "The NVM Checksum Is Not Valid\n");
			err = -EIO;
			goto err_eeprom;
		}
	}

	e1000_eeprom_checks(adapter);

	/* copy the MAC address */
	if (e1000e_read_mac_addr(&adapter->hw))
		dev_err(&pdev->dev,
			"NVM Read Error while reading MAC address\n");

	memcpy(netdev->dev_addr, adapter->hw.mac.addr, netdev->addr_len);

	if (!is_valid_ether_addr(netdev->dev_addr)) {
		dev_err(&pdev->dev, "Invalid MAC Address: %pM\n",
			netdev->dev_addr);
		err = -EIO;
		goto err_eeprom;
	}

	init_timer(&adapter->watchdog_timer);
	adapter->watchdog_timer.function = e1000_watchdog;
	adapter->watchdog_timer.data = (unsigned long) adapter;

	init_timer(&adapter->phy_info_timer);
	adapter->phy_info_timer.function = e1000_update_phy_info;
	adapter->phy_info_timer.data = (unsigned long) adapter;

	INIT_WORK(&adapter->reset_task, e1000_reset_task);
	INIT_WORK(&adapter->watchdog_task, e1000_watchdog_task);
	INIT_WORK(&adapter->downshift_task, e1000e_downshift_workaround);
	INIT_WORK(&adapter->update_phy_task, e1000e_update_phy_task);
	INIT_WORK(&adapter->print_hang_task, e1000_print_hw_hang);

	/* Initialize link parameters. User can change them with ethtool */
	adapter->hw.mac.autoneg = 1;
	adapter->fc_autoneg = true;
	adapter->hw.fc.requested_mode = e1000_fc_default;
	adapter->hw.fc.current_mode = e1000_fc_default;
	adapter->hw.phy.autoneg_advertised = 0x2f;

	/* ring size defaults */
	adapter->rx_ring->count = E1000_DEFAULT_RXD;
	adapter->tx_ring->count = E1000_DEFAULT_TXD;

	/* Initial Wake on LAN setting - If APM wake is enabled in
	 * the EEPROM, enable the ACPI Magic Packet filter
	 */
	if (adapter->flags & FLAG_APME_IN_WUC) {
		/* APME bit in EEPROM is mapped to WUC.APME */
		eeprom_data = er32(WUC);
		eeprom_apme_mask = E1000_WUC_APME;
		if ((hw->mac.type > e1000_ich10lan) &&
		    (eeprom_data & E1000_WUC_PHY_WAKE))
			adapter->flags2 |= FLAG2_HAS_PHY_WAKEUP;
	} else if (adapter->flags & FLAG_APME_IN_CTRL3) {
		if (adapter->flags & FLAG_APME_CHECK_PORT_B &&
		    (adapter->hw.bus.func == 1))
			e1000_read_nvm(&adapter->hw, NVM_INIT_CONTROL3_PORT_B,
				       1, &eeprom_data);
		else
			e1000_read_nvm(&adapter->hw, NVM_INIT_CONTROL3_PORT_A,
				       1, &eeprom_data);
	}

	/* fetch WoL from EEPROM */
	if (eeprom_data & eeprom_apme_mask)
		adapter->eeprom_wol |= E1000_WUFC_MAG;

	/* now that we have the eeprom settings, apply the special cases
	 * where the eeprom may be wrong or the board simply won't support
	 * wake on lan on a particular port
	 */
	if (!(adapter->flags & FLAG_HAS_WOL))
		adapter->eeprom_wol = 0;

	/* initialize the wol settings based on the eeprom settings */
	adapter->wol = adapter->eeprom_wol;
	device_set_wakeup_enable(&adapter->pdev->dev, adapter->wol);

	/* save off EEPROM version number */
	e1000_read_nvm(&adapter->hw, 5, 1, &adapter->eeprom_vers);

	/* reset the hardware with the new settings */
	e1000e_reset(adapter);

	/* If the controller has AMT, do not set DRV_LOAD until the interface
	 * is up.  For all other cases, let the f/w know that the h/w is now
	 * under the control of the driver.
	 */
	if (!(adapter->flags & FLAG_HAS_AMT))
		e1000e_get_hw_control(adapter);

	strlcpy(netdev->name, "eth%d", sizeof(netdev->name));
	err = register_netdev(netdev);
	if (err)
		goto err_register;

	/* carrier off reporting is important to ethtool even BEFORE open */
	netif_carrier_off(netdev);

	/* init PTP hardware clock */
	e1000e_ptp_init(adapter);

	e1000_print_device_info(adapter);

	if (pci_dev_run_wake(pdev))
		pm_runtime_put_noidle(&pdev->dev);

	return 0;

err_register:
	if (!(adapter->flags & FLAG_HAS_AMT))
		e1000e_release_hw_control(adapter);
err_eeprom:
	if (hw->phy.ops.check_reset_block && !hw->phy.ops.check_reset_block(hw))
		e1000_phy_hw_reset(&adapter->hw);
err_hw_init:
	kfree(adapter->tx_ring);
	kfree(adapter->rx_ring);
err_sw_init:
	if (adapter->hw.flash_address)
		iounmap(adapter->hw.flash_address);
	e1000e_reset_interrupt_capability(adapter);
err_flashmap:
	iounmap(adapter->hw.hw_addr);
err_ioremap:
	free_netdev(netdev);
err_alloc_etherdev:
	pci_release_selected_regions(pdev,
	                             pci_select_bars(pdev, IORESOURCE_MEM));
err_pci_reg:
err_dma:
	pci_disable_device(pdev);
	return err;
}

/**
 * e1000_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * e1000_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/
static void e1000_remove(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct e1000_adapter *adapter = netdev_priv(netdev);
	bool down = test_bit(__E1000_DOWN, &adapter->state);

	e1000e_ptp_remove(adapter);

	/* The timers may be rescheduled, so explicitly disable them
	 * from being rescheduled.
	 */
	if (!down)
		set_bit(__E1000_DOWN, &adapter->state);
	del_timer_sync(&adapter->watchdog_timer);
	del_timer_sync(&adapter->phy_info_timer);

	cancel_work_sync(&adapter->reset_task);
	cancel_work_sync(&adapter->watchdog_task);
	cancel_work_sync(&adapter->downshift_task);
	cancel_work_sync(&adapter->update_phy_task);
	cancel_work_sync(&adapter->print_hang_task);

	if (adapter->flags & FLAG_HAS_HW_TIMESTAMP) {
		cancel_work_sync(&adapter->tx_hwtstamp_work);
		if (adapter->tx_hwtstamp_skb) {
			dev_kfree_skb_any(adapter->tx_hwtstamp_skb);
			adapter->tx_hwtstamp_skb = NULL;
		}
	}

	if (!(netdev->flags & IFF_UP))
		e1000_power_down_phy(adapter);

	/* Don't lie to e1000_close() down the road. */
	if (!down)
		clear_bit(__E1000_DOWN, &adapter->state);
	unregister_netdev(netdev);

	if (pci_dev_run_wake(pdev))
		pm_runtime_get_noresume(&pdev->dev);

	/* Release control of h/w to f/w.  If f/w is AMT enabled, this
	 * would have already happened in close and is redundant.
	 */
	e1000e_release_hw_control(adapter);

	e1000e_reset_interrupt_capability(adapter);
	kfree(adapter->tx_ring);
	kfree(adapter->rx_ring);

	iounmap(adapter->hw.hw_addr);
	if (adapter->hw.flash_address)
		iounmap(adapter->hw.flash_address);
	pci_release_selected_regions(pdev,
	                             pci_select_bars(pdev, IORESOURCE_MEM));

	free_netdev(netdev);

	/* AER disable */
	pci_disable_pcie_error_reporting(pdev);

	pci_disable_device(pdev);
}

/* PCI Error Recovery (ERS) */
static const struct pci_error_handlers e1000_err_handler = {
	.error_detected = e1000_io_error_detected,
	.slot_reset = e1000_io_slot_reset,
	.resume = e1000_io_resume,
};

static DEFINE_PCI_DEVICE_TABLE(e1000_pci_tbl) = {
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82571EB_COPPER), board_82571 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82571EB_FIBER), board_82571 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82571EB_QUAD_COPPER), board_82571 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82571EB_QUAD_COPPER_LP), board_82571 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82571EB_QUAD_FIBER), board_82571 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82571EB_SERDES), board_82571 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82571EB_SERDES_DUAL), board_82571 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82571EB_SERDES_QUAD), board_82571 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82571PT_QUAD_COPPER), board_82571 },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82572EI), board_82572 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82572EI_COPPER), board_82572 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82572EI_FIBER), board_82572 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82572EI_SERDES), board_82572 },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82573E), board_82573 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82573E_IAMT), board_82573 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82573L), board_82573 },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82574L), board_82574 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82574LA), board_82574 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82583V), board_82583 },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_80003ES2LAN_COPPER_DPT),
	  board_80003es2lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_80003ES2LAN_COPPER_SPT),
	  board_80003es2lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_80003ES2LAN_SERDES_DPT),
	  board_80003es2lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_80003ES2LAN_SERDES_SPT),
	  board_80003es2lan },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH8_IFE), board_ich8lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH8_IFE_G), board_ich8lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH8_IFE_GT), board_ich8lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH8_IGP_AMT), board_ich8lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH8_IGP_C), board_ich8lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH8_IGP_M), board_ich8lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH8_IGP_M_AMT), board_ich8lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH8_82567V_3), board_ich8lan },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH9_IFE), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH9_IFE_G), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH9_IFE_GT), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH9_IGP_AMT), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH9_IGP_C), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH9_BM), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH9_IGP_M), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH9_IGP_M_AMT), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH9_IGP_M_V), board_ich9lan },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH10_R_BM_LM), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH10_R_BM_LF), board_ich9lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH10_R_BM_V), board_ich9lan },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH10_D_BM_LM), board_ich10lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH10_D_BM_LF), board_ich10lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_ICH10_D_BM_V), board_ich10lan },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH_M_HV_LM), board_pchlan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH_M_HV_LC), board_pchlan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH_D_HV_DM), board_pchlan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH_D_HV_DC), board_pchlan },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH2_LV_LM), board_pch2lan },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH2_LV_V), board_pch2lan },

	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH_LPT_I217_LM), board_pch_lpt },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH_LPT_I217_V), board_pch_lpt },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH_LPTLP_I218_LM), board_pch_lpt },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_PCH_LPTLP_I218_V), board_pch_lpt },

	{ 0, 0, 0, 0, 0, 0, 0 }	/* terminate list */
};
MODULE_DEVICE_TABLE(pci, e1000_pci_tbl);

#ifdef CONFIG_PM
static const struct dev_pm_ops e1000_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(e1000_suspend, e1000_resume)
	SET_RUNTIME_PM_OPS(e1000_runtime_suspend,
				e1000_runtime_resume, e1000_idle)
};
#endif

/* PCI Device API Driver */
static struct pci_driver e1000_driver = {
	.name     = e1000e_driver_name,
	.id_table = e1000_pci_tbl,
	.probe    = e1000_probe,
	.remove   = e1000_remove,
#ifdef CONFIG_PM
	.driver   = {
		.pm = &e1000_pm_ops,
	},
#endif
	.shutdown = e1000_shutdown,
	.err_handler = &e1000_err_handler
};

/**
 * e1000_init_module - Driver Registration Routine
 *
 * e1000_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 **/
static int __init e1000_init_module(void)
{
	int ret;
	pr_info("Intel(R) PRO/1000 Network Driver - %s\n",
		e1000e_driver_version);
	pr_info("Copyright(c) 1999 - 2013 Intel Corporation.\n");
	ret = pci_register_driver(&e1000_driver);

	return ret;
}
module_init(e1000_init_module);

/**
 * e1000_exit_module - Driver Exit Cleanup Routine
 *
 * e1000_exit_module is called just before the driver is removed
 * from memory.
 **/
static void __exit e1000_exit_module(void)
{
	pci_unregister_driver(&e1000_driver);
}
module_exit(e1000_exit_module);


MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) PRO/1000 Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

/* netdev.c */