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133 lines
3.3 KiB
133 lines
3.3 KiB
/* |
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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/ieee802154_netdev.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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}; |
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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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struct mac802154_sub_if_data *sdata; |
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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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xw->priv->phy->current_channel = xw->chan; |
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xw->priv->phy->current_page = xw->page; |
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} |
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res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb); |
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if (res) |
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pr_debug("transmission failed\n"); |
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out: |
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mutex_unlock(&xw->priv->phy->pib_lock); |
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/* Restart the netif queue on each sub_if_data object. */ |
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rcu_read_lock(); |
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list_for_each_entry_rcu(sdata, &xw->priv->slaves, list) |
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netif_wake_queue(sdata->dev); |
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rcu_read_unlock(); |
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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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struct mac802154_sub_if_data *sdata; |
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if (!(priv->phy->channels_supported[page] & (1 << chan))) { |
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WARN_ON(1); |
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goto err_tx; |
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} |
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mac802154_monitors_rx(mac802154_to_priv(&priv->hw), skb); |
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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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goto err_tx; |
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work = kzalloc(sizeof(*work), GFP_ATOMIC); |
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if (!work) { |
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kfree_skb(skb); |
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return NETDEV_TX_BUSY; |
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} |
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/* Stop the netif queue on each sub_if_data object. */ |
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rcu_read_lock(); |
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list_for_each_entry_rcu(sdata, &priv->slaves, list) |
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netif_stop_queue(sdata->dev); |
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rcu_read_unlock(); |
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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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queue_work(priv->dev_workqueue, &work->work); |
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return NETDEV_TX_OK; |
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err_tx: |
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kfree_skb(skb); |
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return NETDEV_TX_OK; |
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}
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