enic: fixes for review items from Ben Hutchings

Fixes for review items from Ben Hutchings:
 - use netdev->net_stats rather than private net_stats
 - use ethtool op .get_sset_count rather than .get_stats_count
 - err out if setting Tx/Rx csum or TSO using ethtool and setting is
   not enabled for device.
 - pass in jiffies + constant to round_jiffies
 - return err if new MTU is out-of-bounds

Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/enic/enic.h

@@ -75,7 +75,6 @@ struct enic {
 	struct vnic_enet_config config;
 	struct vnic_dev_bar bar0;
 	struct vnic_dev *vdev;
-	struct net_device_stats net_stats;
 	struct timer_list notify_timer;
 	struct work_struct reset;
 	struct msix_entry msix_entry[ENIC_MSIX_MAX];

drivers/net/enic/enic_main.c

@@ -43,7 +43,6 @@
 #include "enic.h"
 
 #define ENIC_NOTIFY_TIMER_PERIOD	(2 * HZ)
-#define ENIC_JUMBO_FIRST_BUF_SIZE	256
 
 /* Supported devices */
 static struct pci_device_id enic_id_table[] = {
@@ -167,9 +166,14 @@ static void enic_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
 	}
 }
 
-static int enic_get_stats_count(struct net_device *netdev)
+static int enic_get_sset_count(struct net_device *netdev, int sset)
 {
-	return enic_n_tx_stats + enic_n_rx_stats;
+	switch (sset) {
+	case ETH_SS_STATS:
+		return enic_n_tx_stats + enic_n_rx_stats;
+	default:
+		return -EOPNOTSUPP;
+	}
 }
 
 static void enic_get_ethtool_stats(struct net_device *netdev,
@@ -199,8 +203,10 @@ static int enic_set_rx_csum(struct net_device *netdev, u32 data)
 {
 	struct enic *enic = netdev_priv(netdev);
 
-	enic->csum_rx_enabled =
-		(data && ENIC_SETTING(enic, RXCSUM)) ? 1 : 0;
+	if (data && !ENIC_SETTING(enic, RXCSUM))
+		return -EINVAL;
+
+	enic->csum_rx_enabled = !!data;
 
 	return 0;
 }
@@ -209,7 +215,10 @@ static int enic_set_tx_csum(struct net_device *netdev, u32 data)
 {
 	struct enic *enic = netdev_priv(netdev);
 
-	if (data && ENIC_SETTING(enic, TXCSUM))
+	if (data && !ENIC_SETTING(enic, TXCSUM))
+		return -EINVAL;
+
+	if (data)
 		netdev->features |= NETIF_F_HW_CSUM;
 	else
 		netdev->features &= ~NETIF_F_HW_CSUM;
@@ -221,7 +230,10 @@ static int enic_set_tso(struct net_device *netdev, u32 data)
 {
 	struct enic *enic = netdev_priv(netdev);
 
-	if (data && ENIC_SETTING(enic, TSO))
+	if (data && !ENIC_SETTING(enic, TSO))
+		return -EINVAL;
+
+	if (data)
 		netdev->features |=
 			NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN;
 	else
@@ -250,7 +262,7 @@ static struct ethtool_ops enic_ethtool_ops = {
 	.set_msglevel = enic_set_msglevel,
 	.get_link = ethtool_op_get_link,
 	.get_strings = enic_get_strings,
-	.get_stats_count = enic_get_stats_count,
+	.get_sset_count = enic_get_sset_count,
 	.get_ethtool_stats = enic_get_ethtool_stats,
 	.get_rx_csum = enic_get_rx_csum,
 	.set_rx_csum = enic_set_rx_csum,
@@ -652,25 +664,26 @@ static int enic_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 static struct net_device_stats *enic_get_stats(struct net_device *netdev)
 {
 	struct enic *enic = netdev_priv(netdev);
+	struct net_device_stats *net_stats = &netdev->stats;
 	struct vnic_stats *stats;
 
 	spin_lock(&enic->devcmd_lock);
 	vnic_dev_stats_dump(enic->vdev, &stats);
 	spin_unlock(&enic->devcmd_lock);
 
-	enic->net_stats.tx_packets = stats->tx.tx_frames_ok;
-	enic->net_stats.tx_bytes = stats->tx.tx_bytes_ok;
-	enic->net_stats.tx_errors = stats->tx.tx_errors;
-	enic->net_stats.tx_dropped = stats->tx.tx_drops;
+	net_stats->tx_packets = stats->tx.tx_frames_ok;
+	net_stats->tx_bytes = stats->tx.tx_bytes_ok;
+	net_stats->tx_errors = stats->tx.tx_errors;
+	net_stats->tx_dropped = stats->tx.tx_drops;
 
-	enic->net_stats.rx_packets = stats->rx.rx_frames_ok;
-	enic->net_stats.rx_bytes = stats->rx.rx_bytes_ok;
-	enic->net_stats.rx_errors = stats->rx.rx_errors;
-	enic->net_stats.multicast = stats->rx.rx_multicast_frames_ok;
-	enic->net_stats.rx_crc_errors = stats->rx.rx_crc_errors;
-	enic->net_stats.rx_dropped = stats->rx.rx_no_bufs;
+	net_stats->rx_packets = stats->rx.rx_frames_ok;
+	net_stats->rx_bytes = stats->rx.rx_bytes_ok;
+	net_stats->rx_errors = stats->rx.rx_errors;
+	net_stats->multicast = stats->rx.rx_multicast_frames_ok;
+	net_stats->rx_crc_errors = stats->rx.rx_crc_errors;
+	net_stats->rx_dropped = stats->rx.rx_no_bufs;
 
-	return &enic->net_stats;
+	return net_stats;
 }
 
 static void enic_reset_mcaddrs(struct enic *enic)
@@ -1109,7 +1122,8 @@ static void enic_notify_timer(unsigned long data)
 
 	enic_notify_check(enic);
 
-	mod_timer(&enic->notify_timer, round_jiffies(ENIC_NOTIFY_TIMER_PERIOD));
+	mod_timer(&enic->notify_timer,
+		round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
 }
 
 static void enic_free_intr(struct enic *enic)
@@ -1313,14 +1327,12 @@ static int enic_change_mtu(struct net_device *netdev, int new_mtu)
 	struct enic *enic = netdev_priv(netdev);
 	int running = netif_running(netdev);
 
+	if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
+		return -EINVAL;
+
 	if (running)
 		enic_stop(netdev);
 
-	if (new_mtu < ENIC_MIN_MTU)
-		new_mtu = ENIC_MIN_MTU;
-	if (new_mtu > ENIC_MAX_MTU)
-		new_mtu = ENIC_MAX_MTU;
-
 	netdev->mtu = new_mtu;
 
 	if (netdev->mtu > enic->port_mtu)