118 строки
2.9 KiB
C
118 строки
2.9 KiB
C
/*
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* Copyright 2007-2012 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Written by:
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Sergey Lapin <slapin@ossfans.org>
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* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/crc-ccitt.h>
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#include <net/mac802154.h>
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#include <net/wpan-phy.h>
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#include "mac802154.h"
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/* IEEE 802.15.4 transceivers can sleep during the xmit session, so process
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* packets through the workqueue.
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*/
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struct xmit_work {
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struct sk_buff *skb;
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struct work_struct work;
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struct mac802154_priv *priv;
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u8 chan;
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u8 page;
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u8 xmit_attempts;
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};
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static void mac802154_xmit_worker(struct work_struct *work)
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{
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struct xmit_work *xw = container_of(work, struct xmit_work, work);
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int res;
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mutex_lock(&xw->priv->phy->pib_lock);
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if (xw->priv->phy->current_channel != xw->chan ||
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xw->priv->phy->current_page != xw->page) {
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res = xw->priv->ops->set_channel(&xw->priv->hw,
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xw->page,
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xw->chan);
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if (res) {
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pr_debug("set_channel failed\n");
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goto out;
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}
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}
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res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb);
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out:
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mutex_unlock(&xw->priv->phy->pib_lock);
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if (res) {
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if (xw->xmit_attempts++ < MAC802154_MAX_XMIT_ATTEMPTS) {
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queue_work(xw->priv->dev_workqueue, &xw->work);
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return;
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} else
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pr_debug("transmission failed for %d times",
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MAC802154_MAX_XMIT_ATTEMPTS);
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}
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dev_kfree_skb(xw->skb);
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kfree(xw);
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}
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netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb,
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u8 page, u8 chan)
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{
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struct xmit_work *work;
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if (!(priv->phy->channels_supported[page] & (1 << chan))) {
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WARN_ON(1);
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return NETDEV_TX_OK;
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}
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if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
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u16 crc = crc_ccitt(0, skb->data, skb->len);
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u8 *data = skb_put(skb, 2);
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data[0] = crc & 0xff;
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data[1] = crc >> 8;
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}
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if (skb_cow_head(skb, priv->hw.extra_tx_headroom)) {
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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work = kzalloc(sizeof(struct xmit_work), GFP_ATOMIC);
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if (!work)
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return NETDEV_TX_BUSY;
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INIT_WORK(&work->work, mac802154_xmit_worker);
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work->skb = skb;
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work->priv = priv;
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work->page = page;
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work->chan = chan;
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work->xmit_attempts = 0;
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queue_work(priv->dev_workqueue, &work->work);
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return NETDEV_TX_OK;
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}
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