diff options
Diffstat (limited to 'net/mac802154/tx.c')
| -rw-r--r-- | net/mac802154/tx.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c new file mode 100644 index 00000000000..6d1647399d4 --- /dev/null +++ b/net/mac802154/tx.c @@ -0,0 +1,131 @@ +/* + * 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * 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); + kfree_skb(skb); + return NETDEV_TX_OK; + } + + 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)) { + kfree_skb(skb); + return NETDEV_TX_OK; + } + + work = kzalloc(sizeof(struct xmit_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; +} |