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@@ -0,0 +1,632 @@
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+/*
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+ * WUSB Wire Adapter: WLP interface
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+ * Deal with TX (massaging data to transmit, handling it)
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+ *
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+ * Copyright (C) 2005-2006 Intel Corporation
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+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License version
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+ * 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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+ * 02110-1301, USA.
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+ *
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+ *
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+ * Transmission engine. Get an skb, create from that a WLP transmit
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+ * context, add a WLP TX header (which we keep prefilled in the
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+ * device's instance), fill out the target-specific fields and
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+ * fire it.
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+ *
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+ * ROADMAP:
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+ *
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+ * Entry points:
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+ *
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+ * i1480u_tx_release(): called by i1480u_disconnect() to release
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+ * pending tx contexts.
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+ *
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+ * i1480u_tx_cb(): callback for TX contexts (USB URBs)
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+ * i1480u_tx_destroy():
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+ *
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+ * i1480u_tx_timeout(): called for timeout handling from the
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+ * network stack.
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+ *
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+ * i1480u_hard_start_xmit(): called for transmitting an skb from
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+ * the network stack. Will interact with WLP
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+ * substack to verify and prepare frame.
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+ * i1480u_xmit_frame(): actual transmission on hardware
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+ *
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+ * i1480u_tx_create() Creates TX context
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+ * i1480u_tx_create_1() For packets in 1 fragment
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+ * i1480u_tx_create_n() For packets in >1 fragments
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+ *
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+ * TODO:
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+ *
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+ * - FIXME: rewrite using usb_sg_*(), add asynch support to
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+ * usb_sg_*(). It might not make too much sense as most of
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+ * the times the MTU will be smaller than one page...
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+ */
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+
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+#include "i1480u-wlp.h"
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+#define D_LOCAL 5
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+#include <linux/uwb/debug.h>
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+
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+enum {
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+ /* This is only for Next and Last TX packets */
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+ i1480u_MAX_PL_SIZE = i1480u_MAX_FRG_SIZE
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+ - sizeof(struct untd_hdr_rst),
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+};
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+
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+/** Free resources allocated to a i1480u tx context. */
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+static
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+void i1480u_tx_free(struct i1480u_tx *wtx)
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+{
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+ kfree(wtx->buf);
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+ if (wtx->skb)
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+ dev_kfree_skb_irq(wtx->skb);
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+ usb_free_urb(wtx->urb);
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+ kfree(wtx);
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+}
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+
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+static
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+void i1480u_tx_destroy(struct i1480u *i1480u, struct i1480u_tx *wtx)
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+{
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+ unsigned long flags;
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+ spin_lock_irqsave(&i1480u->tx_list_lock, flags); /* not active any more */
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+ list_del(&wtx->list_node);
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+ i1480u_tx_free(wtx);
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+ spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
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+}
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+
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+static
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+void i1480u_tx_unlink_urbs(struct i1480u *i1480u)
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+{
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+ unsigned long flags;
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+ struct i1480u_tx *wtx, *next;
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+
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+ spin_lock_irqsave(&i1480u->tx_list_lock, flags);
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+ list_for_each_entry_safe(wtx, next, &i1480u->tx_list, list_node) {
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+ usb_unlink_urb(wtx->urb);
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+ }
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+ spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
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+}
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+
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+
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+/**
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+ * Callback for a completed tx USB URB.
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+ *
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+ * TODO:
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+ *
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+ * - FIXME: recover errors more gracefully
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+ * - FIXME: handle NAKs (I dont think they come here) for flow ctl
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+ */
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+static
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+void i1480u_tx_cb(struct urb *urb)
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+{
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+ struct i1480u_tx *wtx = urb->context;
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+ struct i1480u *i1480u = wtx->i1480u;
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+ struct net_device *net_dev = i1480u->net_dev;
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+ struct device *dev = &i1480u->usb_iface->dev;
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+ unsigned long flags;
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+
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+ switch (urb->status) {
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+ case 0:
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+ spin_lock_irqsave(&i1480u->lock, flags);
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+ i1480u->stats.tx_packets++;
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+ i1480u->stats.tx_bytes += urb->actual_length;
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+ spin_unlock_irqrestore(&i1480u->lock, flags);
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+ break;
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+ case -ECONNRESET: /* Not an error, but a controlled situation; */
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+ case -ENOENT: /* (we killed the URB)...so, no broadcast */
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+ dev_dbg(dev, "notif endp: reset/noent %d\n", urb->status);
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+ netif_stop_queue(net_dev);
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+ break;
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+ case -ESHUTDOWN: /* going away! */
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+ dev_dbg(dev, "notif endp: down %d\n", urb->status);
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+ netif_stop_queue(net_dev);
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+ break;
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+ default:
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+ dev_err(dev, "TX: unknown URB status %d\n", urb->status);
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+ if (edc_inc(&i1480u->tx_errors, EDC_MAX_ERRORS,
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+ EDC_ERROR_TIMEFRAME)) {
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+ dev_err(dev, "TX: max acceptable errors exceeded."
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+ "Reset device.\n");
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+ netif_stop_queue(net_dev);
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+ i1480u_tx_unlink_urbs(i1480u);
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+ wlp_reset_all(&i1480u->wlp);
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+ }
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+ break;
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+ }
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+ i1480u_tx_destroy(i1480u, wtx);
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+ if (atomic_dec_return(&i1480u->tx_inflight.count)
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+ <= i1480u->tx_inflight.threshold
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+ && netif_queue_stopped(net_dev)
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+ && i1480u->tx_inflight.threshold != 0) {
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+ if (d_test(2) && printk_ratelimit())
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+ d_printf(2, dev, "Restart queue. \n");
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+ netif_start_queue(net_dev);
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+ atomic_inc(&i1480u->tx_inflight.restart_count);
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+ }
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+ return;
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+}
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+
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+
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+/**
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+ * Given a buffer that doesn't fit in a single fragment, create an
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+ * scatter/gather structure for delivery to the USB pipe.
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+ *
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+ * Implements functionality of i1480u_tx_create().
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+ *
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+ * @wtx: tx descriptor
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+ * @skb: skb to send
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+ * @gfp_mask: gfp allocation mask
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+ * @returns: Pointer to @wtx if ok, NULL on error.
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+ *
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+ * Sorry, TOO LONG a function, but breaking it up is kind of hard
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+ *
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+ * This will break the buffer in chunks smaller than
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+ * i1480u_MAX_FRG_SIZE (including the header) and add proper headers
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+ * to each:
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+ *
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+ * 1st header \
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+ * i1480 tx header | fragment 1
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+ * fragment data /
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+ * nxt header \ fragment 2
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+ * fragment data /
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+ * ..
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+ * ..
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+ * last header \ fragment 3
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+ * last fragment data /
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+ *
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+ * This does not fill the i1480 TX header, it is left up to the
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+ * caller to do that; you can get it from @wtx->wlp_tx_hdr.
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+ *
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+ * This function consumes the skb unless there is an error.
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+ */
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+static
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+int i1480u_tx_create_n(struct i1480u_tx *wtx, struct sk_buff *skb,
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+ gfp_t gfp_mask)
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+{
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+ int result;
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+ void *pl;
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+ size_t pl_size;
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+
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+ void *pl_itr, *buf_itr;
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+ size_t pl_size_left, frgs, pl_size_1st, frg_pl_size = 0;
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+ struct untd_hdr_1st *untd_hdr_1st;
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+ struct wlp_tx_hdr *wlp_tx_hdr;
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+ struct untd_hdr_rst *untd_hdr_rst;
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+
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+ wtx->skb = NULL;
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+ pl = skb->data;
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+ pl_itr = pl;
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+ pl_size = skb->len;
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+ pl_size_left = pl_size; /* payload size */
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+ /* First fragment; fits as much as i1480u_MAX_FRG_SIZE minus
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+ * the headers */
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+ pl_size_1st = i1480u_MAX_FRG_SIZE
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+ - sizeof(struct untd_hdr_1st) - sizeof(struct wlp_tx_hdr);
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+ BUG_ON(pl_size_1st > pl_size);
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+ pl_size_left -= pl_size_1st;
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+ /* The rest have an smaller header (no i1480 TX header). We
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+ * need to break up the payload in blocks smaller than
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+ * i1480u_MAX_PL_SIZE (payload excluding header). */
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+ frgs = (pl_size_left + i1480u_MAX_PL_SIZE - 1) / i1480u_MAX_PL_SIZE;
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+ /* Allocate space for the new buffer. In this new buffer we'll
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+ * place the headers followed by the data fragment, headers,
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+ * data fragments, etc..
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+ */
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+ result = -ENOMEM;
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+ wtx->buf_size = sizeof(*untd_hdr_1st)
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+ + sizeof(*wlp_tx_hdr)
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+ + frgs * sizeof(*untd_hdr_rst)
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+ + pl_size;
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+ wtx->buf = kmalloc(wtx->buf_size, gfp_mask);
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+ if (wtx->buf == NULL)
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+ goto error_buf_alloc;
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+
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+ buf_itr = wtx->buf; /* We got the space, let's fill it up */
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+ /* Fill 1st fragment */
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+ untd_hdr_1st = buf_itr;
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+ buf_itr += sizeof(*untd_hdr_1st);
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+ untd_hdr_set_type(&untd_hdr_1st->hdr, i1480u_PKT_FRAG_1ST);
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+ untd_hdr_set_rx_tx(&untd_hdr_1st->hdr, 0);
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+ untd_hdr_1st->hdr.len = cpu_to_le16(pl_size + sizeof(*wlp_tx_hdr));
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+ untd_hdr_1st->fragment_len =
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+ cpu_to_le16(pl_size_1st + sizeof(*wlp_tx_hdr));
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+ memset(untd_hdr_1st->padding, 0, sizeof(untd_hdr_1st->padding));
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+ /* Set up i1480 header info */
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+ wlp_tx_hdr = wtx->wlp_tx_hdr = buf_itr;
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+ buf_itr += sizeof(*wlp_tx_hdr);
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+ /* Copy the first fragment */
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+ memcpy(buf_itr, pl_itr, pl_size_1st);
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+ pl_itr += pl_size_1st;
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+ buf_itr += pl_size_1st;
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+
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+ /* Now do each remaining fragment */
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+ result = -EINVAL;
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+ while (pl_size_left > 0) {
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+ d_printf(5, NULL, "ITR HDR: pl_size_left %zu buf_itr %zu\n",
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+ pl_size_left, buf_itr - wtx->buf);
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+ if (buf_itr + sizeof(*untd_hdr_rst) - wtx->buf
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+ > wtx->buf_size) {
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+ printk(KERN_ERR "BUG: no space for header\n");
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+ goto error_bug;
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+ }
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+ d_printf(5, NULL, "ITR HDR 2: pl_size_left %zu buf_itr %zu\n",
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+ pl_size_left, buf_itr - wtx->buf);
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+ untd_hdr_rst = buf_itr;
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+ buf_itr += sizeof(*untd_hdr_rst);
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+ if (pl_size_left > i1480u_MAX_PL_SIZE) {
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+ frg_pl_size = i1480u_MAX_PL_SIZE;
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+ untd_hdr_set_type(&untd_hdr_rst->hdr, i1480u_PKT_FRAG_NXT);
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+ } else {
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+ frg_pl_size = pl_size_left;
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+ untd_hdr_set_type(&untd_hdr_rst->hdr, i1480u_PKT_FRAG_LST);
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+ }
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+ d_printf(5, NULL,
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+ "ITR PL: pl_size_left %zu buf_itr %zu frg_pl_size %zu\n",
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+ pl_size_left, buf_itr - wtx->buf, frg_pl_size);
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+ untd_hdr_set_rx_tx(&untd_hdr_rst->hdr, 0);
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+ untd_hdr_rst->hdr.len = cpu_to_le16(frg_pl_size);
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+ untd_hdr_rst->padding = 0;
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+ if (buf_itr + frg_pl_size - wtx->buf
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+ > wtx->buf_size) {
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+ printk(KERN_ERR "BUG: no space for payload\n");
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+ goto error_bug;
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+ }
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+ memcpy(buf_itr, pl_itr, frg_pl_size);
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+ buf_itr += frg_pl_size;
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+ pl_itr += frg_pl_size;
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+ pl_size_left -= frg_pl_size;
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+ d_printf(5, NULL,
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+ "ITR PL 2: pl_size_left %zu buf_itr %zu frg_pl_size %zu\n",
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+ pl_size_left, buf_itr - wtx->buf, frg_pl_size);
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+ }
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+ dev_kfree_skb_irq(skb);
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+ return 0;
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+
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+error_bug:
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+ printk(KERN_ERR
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+ "BUG: skb %u bytes\n"
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+ "BUG: frg_pl_size %zd i1480u_MAX_FRG_SIZE %u\n"
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+ "BUG: buf_itr %zu buf_size %zu pl_size_left %zu\n",
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+ skb->len,
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+ frg_pl_size, i1480u_MAX_FRG_SIZE,
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+ buf_itr - wtx->buf, wtx->buf_size, pl_size_left);
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+
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+ kfree(wtx->buf);
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+error_buf_alloc:
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+ return result;
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+}
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+
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+
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+/**
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+ * Given a buffer that fits in a single fragment, fill out a @wtx
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+ * struct for transmitting it down the USB pipe.
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+ *
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+ * Uses the fact that we have space reserved in front of the skbuff
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+ * for hardware headers :]
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+ *
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+ * This does not fill the i1480 TX header, it is left up to the
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+ * caller to do that; you can get it from @wtx->wlp_tx_hdr.
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+ *
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+ * @pl: pointer to payload data
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+ * @pl_size: size of the payuload
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+ *
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+ * This function does not consume the @skb.
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+ */
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+static
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+int i1480u_tx_create_1(struct i1480u_tx *wtx, struct sk_buff *skb,
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+ gfp_t gfp_mask)
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+{
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+ struct untd_hdr_cmp *untd_hdr_cmp;
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+ struct wlp_tx_hdr *wlp_tx_hdr;
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+
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+ wtx->buf = NULL;
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+ wtx->skb = skb;
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+ BUG_ON(skb_headroom(skb) < sizeof(*wlp_tx_hdr));
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+ wlp_tx_hdr = (void *) __skb_push(skb, sizeof(*wlp_tx_hdr));
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+ wtx->wlp_tx_hdr = wlp_tx_hdr;
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+ BUG_ON(skb_headroom(skb) < sizeof(*untd_hdr_cmp));
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+ untd_hdr_cmp = (void *) __skb_push(skb, sizeof(*untd_hdr_cmp));
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+
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+ untd_hdr_set_type(&untd_hdr_cmp->hdr, i1480u_PKT_FRAG_CMP);
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+ untd_hdr_set_rx_tx(&untd_hdr_cmp->hdr, 0);
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+ untd_hdr_cmp->hdr.len = cpu_to_le16(skb->len - sizeof(*untd_hdr_cmp));
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+ untd_hdr_cmp->padding = 0;
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+ return 0;
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+}
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+
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+
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+/**
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+ * Given a skb to transmit, massage it to become palatable for the TX pipe
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+ *
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+ * This will break the buffer in chunks smaller than
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+ * i1480u_MAX_FRG_SIZE and add proper headers to each.
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+ *
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+ * 1st header \
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+ * i1480 tx header | fragment 1
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+ * fragment data /
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+ * nxt header \ fragment 2
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+ * fragment data /
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+ * ..
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+ * ..
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+ * last header \ fragment 3
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+ * last fragment data /
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+ *
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|
|
+ * Each fragment will be always smaller or equal to i1480u_MAX_FRG_SIZE.
|
|
|
+ *
|
|
|
+ * If the first fragment is smaller than i1480u_MAX_FRG_SIZE, then the
|
|
|
+ * following is composed:
|
|
|
+ *
|
|
|
+ * complete header \
|
|
|
+ * i1480 tx header | single fragment
|
|
|
+ * packet data /
|
|
|
+ *
|
|
|
+ * We were going to use s/g support, but because the interface is
|
|
|
+ * synch and at the end there is plenty of overhead to do it, it
|
|
|
+ * didn't seem that worth for data that is going to be smaller than
|
|
|
+ * one page.
|
|
|
+ */
|
|
|
+static
|
|
|
+struct i1480u_tx *i1480u_tx_create(struct i1480u *i1480u,
|
|
|
+ struct sk_buff *skb, gfp_t gfp_mask)
|
|
|
+{
|
|
|
+ int result;
|
|
|
+ struct usb_endpoint_descriptor *epd;
|
|
|
+ int usb_pipe;
|
|
|
+ unsigned long flags;
|
|
|
+
|
|
|
+ struct i1480u_tx *wtx;
|
|
|
+ const size_t pl_max_size =
|
|
|
+ i1480u_MAX_FRG_SIZE - sizeof(struct untd_hdr_cmp)
|
|
|
+ - sizeof(struct wlp_tx_hdr);
|
|
|
+
|
|
|
+ wtx = kmalloc(sizeof(*wtx), gfp_mask);
|
|
|
+ if (wtx == NULL)
|
|
|
+ goto error_wtx_alloc;
|
|
|
+ wtx->urb = usb_alloc_urb(0, gfp_mask);
|
|
|
+ if (wtx->urb == NULL)
|
|
|
+ goto error_urb_alloc;
|
|
|
+ epd = &i1480u->usb_iface->cur_altsetting->endpoint[2].desc;
|
|
|
+ usb_pipe = usb_sndbulkpipe(i1480u->usb_dev, epd->bEndpointAddress);
|
|
|
+ /* Fits in a single complete packet or need to split? */
|
|
|
+ if (skb->len > pl_max_size) {
|
|
|
+ result = i1480u_tx_create_n(wtx, skb, gfp_mask);
|
|
|
+ if (result < 0)
|
|
|
+ goto error_create;
|
|
|
+ usb_fill_bulk_urb(wtx->urb, i1480u->usb_dev, usb_pipe,
|
|
|
+ wtx->buf, wtx->buf_size, i1480u_tx_cb, wtx);
|
|
|
+ } else {
|
|
|
+ result = i1480u_tx_create_1(wtx, skb, gfp_mask);
|
|
|
+ if (result < 0)
|
|
|
+ goto error_create;
|
|
|
+ usb_fill_bulk_urb(wtx->urb, i1480u->usb_dev, usb_pipe,
|
|
|
+ skb->data, skb->len, i1480u_tx_cb, wtx);
|
|
|
+ }
|
|
|
+ spin_lock_irqsave(&i1480u->tx_list_lock, flags);
|
|
|
+ list_add(&wtx->list_node, &i1480u->tx_list);
|
|
|
+ spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
|
|
|
+ return wtx;
|
|
|
+
|
|
|
+error_create:
|
|
|
+ kfree(wtx->urb);
|
|
|
+error_urb_alloc:
|
|
|
+ kfree(wtx);
|
|
|
+error_wtx_alloc:
|
|
|
+ return NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * Actual fragmentation and transmission of frame
|
|
|
+ *
|
|
|
+ * @wlp: WLP substack data structure
|
|
|
+ * @skb: To be transmitted
|
|
|
+ * @dst: Device address of destination
|
|
|
+ * @returns: 0 on success, <0 on failure
|
|
|
+ *
|
|
|
+ * This function can also be called directly (not just from
|
|
|
+ * hard_start_xmit), so we also check here if the interface is up before
|
|
|
+ * taking sending anything.
|
|
|
+ */
|
|
|
+int i1480u_xmit_frame(struct wlp *wlp, struct sk_buff *skb,
|
|
|
+ struct uwb_dev_addr *dst)
|
|
|
+{
|
|
|
+ int result = -ENXIO;
|
|
|
+ struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
|
|
|
+ struct device *dev = &i1480u->usb_iface->dev;
|
|
|
+ struct net_device *net_dev = i1480u->net_dev;
|
|
|
+ struct i1480u_tx *wtx;
|
|
|
+ struct wlp_tx_hdr *wlp_tx_hdr;
|
|
|
+ static unsigned char dev_bcast[2] = { 0xff, 0xff };
|
|
|
+#if 0
|
|
|
+ int lockup = 50;
|
|
|
+#endif
|
|
|
+
|
|
|
+ d_fnstart(6, dev, "(skb %p (%u), net_dev %p)\n", skb, skb->len,
|
|
|
+ net_dev);
|
|
|
+ BUG_ON(i1480u->wlp.rc == NULL);
|
|
|
+ if ((net_dev->flags & IFF_UP) == 0)
|
|
|
+ goto out;
|
|
|
+ result = -EBUSY;
|
|
|
+ if (atomic_read(&i1480u->tx_inflight.count) >= i1480u->tx_inflight.max) {
|
|
|
+ if (d_test(2) && printk_ratelimit())
|
|
|
+ d_printf(2, dev, "Max frames in flight "
|
|
|
+ "stopping queue.\n");
|
|
|
+ netif_stop_queue(net_dev);
|
|
|
+ goto error_max_inflight;
|
|
|
+ }
|
|
|
+ result = -ENOMEM;
|
|
|
+ wtx = i1480u_tx_create(i1480u, skb, GFP_ATOMIC);
|
|
|
+ if (unlikely(wtx == NULL)) {
|
|
|
+ if (printk_ratelimit())
|
|
|
+ dev_err(dev, "TX: no memory for WLP TX URB,"
|
|
|
+ "dropping packet (in flight %d)\n",
|
|
|
+ atomic_read(&i1480u->tx_inflight.count));
|
|
|
+ netif_stop_queue(net_dev);
|
|
|
+ goto error_wtx_alloc;
|
|
|
+ }
|
|
|
+ wtx->i1480u = i1480u;
|
|
|
+ /* Fill out the i1480 header; @i1480u->def_tx_hdr read without
|
|
|
+ * locking. We do so because they are kind of orthogonal to
|
|
|
+ * each other (and thus not changed in an atomic batch).
|
|
|
+ * The ETH header is right after the WLP TX header. */
|
|
|
+ wlp_tx_hdr = wtx->wlp_tx_hdr;
|
|
|
+ *wlp_tx_hdr = i1480u->options.def_tx_hdr;
|
|
|
+ wlp_tx_hdr->dstaddr = *dst;
|
|
|
+ if (!memcmp(&wlp_tx_hdr->dstaddr, dev_bcast, sizeof(dev_bcast))
|
|
|
+ && (wlp_tx_hdr_delivery_id_type(wlp_tx_hdr) & WLP_DRP)) {
|
|
|
+ /*Broadcast message directed to DRP host. Send as best effort
|
|
|
+ * on PCA. */
|
|
|
+ wlp_tx_hdr_set_delivery_id_type(wlp_tx_hdr, i1480u->options.pca_base_priority);
|
|
|
+ }
|
|
|
+
|
|
|
+#if 0
|
|
|
+ dev_info(dev, "TX delivering skb -> USB, %zu bytes\n", skb->len);
|
|
|
+ dump_bytes(dev, skb->data, skb->len > 72 ? 72 : skb->len);
|
|
|
+#endif
|
|
|
+#if 0
|
|
|
+ /* simulates a device lockup after every lockup# packets */
|
|
|
+ if (lockup && ((i1480u->stats.tx_packets + 1) % lockup) == 0) {
|
|
|
+ /* Simulate a dropped transmit interrupt */
|
|
|
+ net_dev->trans_start = jiffies;
|
|
|
+ netif_stop_queue(net_dev);
|
|
|
+ dev_err(dev, "Simulate lockup at %ld\n", jiffies);
|
|
|
+ return result;
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ result = usb_submit_urb(wtx->urb, GFP_ATOMIC); /* Go baby */
|
|
|
+ if (result < 0) {
|
|
|
+ dev_err(dev, "TX: cannot submit URB: %d\n", result);
|
|
|
+ /* We leave the freeing of skb to calling function */
|
|
|
+ wtx->skb = NULL;
|
|
|
+ goto error_tx_urb_submit;
|
|
|
+ }
|
|
|
+ atomic_inc(&i1480u->tx_inflight.count);
|
|
|
+ net_dev->trans_start = jiffies;
|
|
|
+ d_fnend(6, dev, "(skb %p (%u), net_dev %p) = %d\n", skb, skb->len,
|
|
|
+ net_dev, result);
|
|
|
+ return result;
|
|
|
+
|
|
|
+error_tx_urb_submit:
|
|
|
+ i1480u_tx_destroy(i1480u, wtx);
|
|
|
+error_wtx_alloc:
|
|
|
+error_max_inflight:
|
|
|
+out:
|
|
|
+ d_fnend(6, dev, "(skb %p (%u), net_dev %p) = %d\n", skb, skb->len,
|
|
|
+ net_dev, result);
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/**
|
|
|
+ * Transmit an skb Called when an skbuf has to be transmitted
|
|
|
+ *
|
|
|
+ * The skb is first passed to WLP substack to ensure this is a valid
|
|
|
+ * frame. If valid the device address of destination will be filled and
|
|
|
+ * the WLP header prepended to the skb. If this step fails we fake sending
|
|
|
+ * the frame, if we return an error the network stack will just keep trying.
|
|
|
+ *
|
|
|
+ * Broadcast frames inside a WSS needs to be treated special as multicast is
|
|
|
+ * not supported. A broadcast frame is sent as unicast to each member of the
|
|
|
+ * WSS - this is done by the WLP substack when it finds a broadcast frame.
|
|
|
+ * So, we test if the WLP substack took over the skb and only transmit it
|
|
|
+ * if it has not (been taken over).
|
|
|
+ *
|
|
|
+ * @net_dev->xmit_lock is held
|
|
|
+ */
|
|
|
+int i1480u_hard_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
|
|
|
+{
|
|
|
+ int result;
|
|
|
+ struct i1480u *i1480u = netdev_priv(net_dev);
|
|
|
+ struct device *dev = &i1480u->usb_iface->dev;
|
|
|
+ struct uwb_dev_addr dst;
|
|
|
+
|
|
|
+ d_fnstart(6, dev, "(skb %p (%u), net_dev %p)\n", skb, skb->len,
|
|
|
+ net_dev);
|
|
|
+ BUG_ON(i1480u->wlp.rc == NULL);
|
|
|
+ if ((net_dev->flags & IFF_UP) == 0)
|
|
|
+ goto error;
|
|
|
+ result = wlp_prepare_tx_frame(dev, &i1480u->wlp, skb, &dst);
|
|
|
+ if (result < 0) {
|
|
|
+ dev_err(dev, "WLP verification of TX frame failed (%d). "
|
|
|
+ "Dropping packet.\n", result);
|
|
|
+ goto error;
|
|
|
+ } else if (result == 1) {
|
|
|
+ d_printf(6, dev, "WLP will transmit frame. \n");
|
|
|
+ /* trans_start time will be set when WLP actually transmits
|
|
|
+ * the frame */
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+ d_printf(6, dev, "Transmitting frame. \n");
|
|
|
+ result = i1480u_xmit_frame(&i1480u->wlp, skb, &dst);
|
|
|
+ if (result < 0) {
|
|
|
+ dev_err(dev, "Frame TX failed (%d).\n", result);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+ d_fnend(6, dev, "(skb %p (%u), net_dev %p) = %d\n", skb, skb->len,
|
|
|
+ net_dev, result);
|
|
|
+ return NETDEV_TX_OK;
|
|
|
+error:
|
|
|
+ dev_kfree_skb_any(skb);
|
|
|
+ i1480u->stats.tx_dropped++;
|
|
|
+out:
|
|
|
+ d_fnend(6, dev, "(skb %p (%u), net_dev %p) = %d\n", skb, skb->len,
|
|
|
+ net_dev, result);
|
|
|
+ return NETDEV_TX_OK;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/**
|
|
|
+ * Called when a pkt transmission doesn't complete in a reasonable period
|
|
|
+ * Device reset may sleep - do it outside of interrupt context (delayed)
|
|
|
+ */
|
|
|
+void i1480u_tx_timeout(struct net_device *net_dev)
|
|
|
+{
|
|
|
+ struct i1480u *i1480u = netdev_priv(net_dev);
|
|
|
+
|
|
|
+ wlp_reset_all(&i1480u->wlp);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void i1480u_tx_release(struct i1480u *i1480u)
|
|
|
+{
|
|
|
+ unsigned long flags;
|
|
|
+ struct i1480u_tx *wtx, *next;
|
|
|
+ int count = 0, empty;
|
|
|
+
|
|
|
+ spin_lock_irqsave(&i1480u->tx_list_lock, flags);
|
|
|
+ list_for_each_entry_safe(wtx, next, &i1480u->tx_list, list_node) {
|
|
|
+ count++;
|
|
|
+ usb_unlink_urb(wtx->urb);
|
|
|
+ }
|
|
|
+ spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
|
|
|
+ count = count*10; /* i1480ut 200ms per unlinked urb (intervals of 20ms) */
|
|
|
+ /*
|
|
|
+ * We don't like this sollution too much (dirty as it is), but
|
|
|
+ * it is cheaper than putting a refcount on each i1480u_tx and
|
|
|
+ * i1480uting for all of them to go away...
|
|
|
+ *
|
|
|
+ * Called when no more packets can be added to tx_list
|
|
|
+ * so can i1480ut for it to be empty.
|
|
|
+ */
|
|
|
+ while (1) {
|
|
|
+ spin_lock_irqsave(&i1480u->tx_list_lock, flags);
|
|
|
+ empty = list_empty(&i1480u->tx_list);
|
|
|
+ spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
|
|
|
+ if (empty)
|
|
|
+ break;
|
|
|
+ count--;
|
|
|
+ BUG_ON(count == 0);
|
|
|
+ msleep(20);
|
|
|
+ }
|
|
|
+}
|
Inaky Perez-Gonzalez