| /* |
| * Copyright 2007-2012 Siemens AG |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that 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. |
| * |
| * Written by: |
| * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> |
| * Sergey Lapin <slapin@ossfans.org> |
| * Maxim Gorbachyov <maxim.gorbachev@siemens.com> |
| * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> |
| */ |
| |
| #include <linux/netdevice.h> |
| #include <linux/if_arp.h> |
| #include <linux/crc-ccitt.h> |
| |
| #include <net/ieee802154_netdev.h> |
| #include <net/mac802154.h> |
| #include <net/wpan-phy.h> |
| |
| #include "mac802154.h" |
| |
| /* IEEE 802.15.4 transceivers can sleep during the xmit session, so process |
| * packets through the workqueue. |
| */ |
| struct xmit_work { |
| struct sk_buff *skb; |
| struct work_struct work; |
| struct mac802154_priv *priv; |
| u8 chan; |
| u8 page; |
| }; |
| |
| static void mac802154_xmit_worker(struct work_struct *work) |
| { |
| struct xmit_work *xw = container_of(work, struct xmit_work, work); |
| struct mac802154_sub_if_data *sdata; |
| int res; |
| |
| mutex_lock(&xw->priv->phy->pib_lock); |
| if (xw->priv->phy->current_channel != xw->chan || |
| xw->priv->phy->current_page != xw->page) { |
| res = xw->priv->ops->set_channel(&xw->priv->hw, |
| xw->page, |
| xw->chan); |
| if (res) { |
| pr_debug("set_channel failed\n"); |
| goto out; |
| } |
| |
| xw->priv->phy->current_channel = xw->chan; |
| xw->priv->phy->current_page = xw->page; |
| } |
| |
| res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb); |
| if (res) |
| pr_debug("transmission failed\n"); |
| |
| out: |
| mutex_unlock(&xw->priv->phy->pib_lock); |
| |
| /* Restart the netif queue on each sub_if_data object. */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(sdata, &xw->priv->slaves, list) |
| netif_wake_queue(sdata->dev); |
| rcu_read_unlock(); |
| |
| dev_kfree_skb(xw->skb); |
| |
| kfree(xw); |
| } |
| |
| netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb, |
| u8 page, u8 chan) |
| { |
| struct xmit_work *work; |
| struct mac802154_sub_if_data *sdata; |
| |
| if (!(priv->phy->channels_supported[page] & (1 << chan))) { |
| WARN_ON(1); |
| goto err_tx; |
| } |
| |
| mac802154_monitors_rx(mac802154_to_priv(&priv->hw), skb); |
| |
| if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { |
| u16 crc = crc_ccitt(0, skb->data, skb->len); |
| u8 *data = skb_put(skb, 2); |
| |
| data[0] = crc & 0xff; |
| data[1] = crc >> 8; |
| } |
| |
| if (skb_cow_head(skb, priv->hw.extra_tx_headroom)) |
| goto err_tx; |
| |
| work = kzalloc(sizeof(*work), GFP_ATOMIC); |
| if (!work) { |
| kfree_skb(skb); |
| return NETDEV_TX_BUSY; |
| } |
| |
| /* Stop the netif queue on each sub_if_data object. */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(sdata, &priv->slaves, list) |
| netif_stop_queue(sdata->dev); |
| rcu_read_unlock(); |
| |
| INIT_WORK(&work->work, mac802154_xmit_worker); |
| work->skb = skb; |
| work->priv = priv; |
| work->page = page; |
| work->chan = chan; |
| |
| queue_work(priv->dev_workqueue, &work->work); |
| |
| return NETDEV_TX_OK; |
| |
| err_tx: |
| kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |