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/*
* 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/cfg802154.h>
#include "ieee802154_i.h"
/* IEEE 802.15.4 transceivers can sleep during the xmit session, so process
* packets through the workqueue.
*/
struct wpan_xmit_cb {
struct sk_buff *skb;
struct work_struct work;
struct ieee802154_local *local;
u8 chan;
u8 page;
};
static inline struct wpan_xmit_cb *wpan_xmit_cb(const struct sk_buff *skb)
{
BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct wpan_xmit_cb));
return (struct wpan_xmit_cb *)skb->cb;
}
static void mac802154_xmit_worker(struct work_struct *work)
{
struct wpan_xmit_cb *cb = container_of(work, struct wpan_xmit_cb, work);
struct ieee802154_sub_if_data *sdata;
int res;
mutex_lock(&cb->local->phy->pib_lock);
if (cb->local->phy->current_channel != cb->chan ||
cb->local->phy->current_page != cb->page) {
res = cb->local->ops->set_channel(&cb->local->hw, cb->page,
cb->chan);
if (res) {
pr_debug("set_channel failed\n");
goto out;
}
cb->local->phy->current_channel = cb->chan;
cb->local->phy->current_page = cb->page;
}
res = cb->local->ops->xmit(&cb->local->hw, cb->skb);
if (res)
pr_debug("transmission failed\n");
out:
mutex_unlock(&cb->local->phy->pib_lock);
/* Restart the netif queue on each sub_if_data object. */
rcu_read_lock();
list_for_each_entry_rcu(sdata, &cb->local->interfaces, list)
netif_wake_queue(sdata->dev);
rcu_read_unlock();
dev_kfree_skb(cb->skb);
}
static netdev_tx_t mac802154_tx(struct ieee802154_local *local,
struct sk_buff *skb, u8 page, u8 chan)
{
struct ieee802154_sub_if_data *sdata;
struct wpan_xmit_cb *cb = wpan_xmit_cb(skb);
if (!(local->phy->channels_supported[page] & (1 << chan))) {
WARN_ON(1);
goto err_tx;
}
mac802154_monitors_rx(local, skb);
if (!(local->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, local->hw.extra_tx_headroom))
goto err_tx;
/* Stop the netif queue on each sub_if_data object. */
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list)
netif_stop_queue(sdata->dev);
rcu_read_unlock();
INIT_WORK(&cb->work, mac802154_xmit_worker);
cb->skb = skb;
cb->local = local;
cb->page = page;
cb->chan = chan;
queue_work(local->workqueue, &cb->work);
return NETDEV_TX_OK;
err_tx:
kfree_skb(skb);
return NETDEV_TX_OK;
}
netdev_tx_t mac802154_monitor_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
u8 chan, page;
/* FIXME: locking */
chan = sdata->local->phy->current_channel;
page = sdata->local->phy->current_page;
if (chan == MAC802154_CHAN_NONE) /* not initialized */
return NETDEV_TX_OK;
if (WARN_ON(page >= WPAN_NUM_PAGES) ||
WARN_ON(chan >= WPAN_NUM_CHANNELS))
return NETDEV_TX_OK;
skb->skb_iif = dev->ifindex;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
return mac802154_tx(sdata->local, skb, page, chan);
}
netdev_tx_t mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
u8 chan, page;
int rc;
spin_lock_bh(&sdata->mib_lock);
chan = sdata->chan;
page = sdata->page;
spin_unlock_bh(&sdata->mib_lock);
if (chan == MAC802154_CHAN_NONE ||
page >= WPAN_NUM_PAGES ||
chan >= WPAN_NUM_CHANNELS) {
kfree_skb(skb);
return NETDEV_TX_OK;
}
rc = mac802154_llsec_encrypt(&sdata->sec, skb);
if (rc) {
pr_warn("encryption failed: %i\n", rc);
kfree_skb(skb);
return NETDEV_TX_OK;
}
skb->skb_iif = dev->ifindex;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
return mac802154_tx(sdata->local, skb, page, chan);
}
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