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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;
};
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_local *local = cb->local;
struct sk_buff *skb = cb->skb;
int res;
res = local->ops->xmit_sync(&local->hw, skb);
if (res) {
pr_debug("transmission failed\n");
/* Restart the netif queue on each sub_if_data object. */
ieee802154_wake_queue(&local->hw);
kfree_skb(skb);
} else {
/* Restart the netif queue on each sub_if_data object. */
ieee802154_xmit_complete(&local->hw, skb);
}
}
static netdev_tx_t
mac802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
{
struct wpan_xmit_cb *cb = wpan_xmit_cb(skb);
int ret;
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. */
ieee802154_stop_queue(&local->hw);
/* async is priority, otherwise sync is fallback */
if (local->ops->xmit_async) {
ret = local->ops->xmit_async(&local->hw, skb);
if (ret) {
ieee802154_wake_queue(&local->hw);
goto err_tx;
}
} else {
INIT_WORK(&cb->work, mac802154_xmit_worker);
cb->skb = skb;
cb->local = local;
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);
skb->skb_iif = dev->ifindex;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
return mac802154_tx(sdata->local, skb);
}
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);
int rc;
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);
}
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