[linux-2.6-block.git] / net / mac802154 / tx.c

/*
 * 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 <asm/unaligned.h>

#include <net/rtnetlink.h>
#include <net/ieee802154_netdev.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>

#include "ieee802154_i.h"
#include "driver-ops.h"

/* IEEE 802.15.4 transceivers can sleep during the xmit session, so process
 * packets through the workqueue.
 */
struct ieee802154_xmit_cb {
	struct sk_buff *skb;
	struct work_struct work;
	struct ieee802154_local *local;
};

static struct ieee802154_xmit_cb ieee802154_xmit_cb;

static void ieee802154_xmit_worker(struct work_struct *work)
{
	struct ieee802154_xmit_cb *cb =
		container_of(work, struct ieee802154_xmit_cb, work);
	struct ieee802154_local *local = cb->local;
	struct sk_buff *skb = cb->skb;
	struct net_device *dev = skb->dev;
	int res;

	rtnl_lock();

	/* check if ifdown occurred while schedule */
	if (!netif_running(dev))
		goto err_tx;

	res = drv_xmit_sync(local, skb);
	if (res)
		goto err_tx;

	ieee802154_xmit_complete(&local->hw, skb, false);

	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;

	rtnl_unlock();

	return;

err_tx:
	/* Restart the netif queue on each sub_if_data object. */
	ieee802154_wake_queue(&local->hw);
	rtnl_unlock();
	kfree_skb(skb);
	netdev_dbg(dev, "transmission failed\n");
}

static netdev_tx_t
ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	int ret;

	if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
		u16 crc = crc_ccitt(0, skb->data, skb->len);

		put_unaligned_le16(crc, skb_put(skb, 2));
	}

	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 = drv_xmit_async(local, skb);
		if (ret) {
			ieee802154_wake_queue(&local->hw);
			goto err_tx;
		}

		dev->stats.tx_packets++;
		dev->stats.tx_bytes += skb->len;
	} else {
		INIT_WORK(&ieee802154_xmit_cb.work, ieee802154_xmit_worker);
		ieee802154_xmit_cb.skb = skb;
		ieee802154_xmit_cb.local = local;

		queue_work(local->workqueue, &ieee802154_xmit_cb.work);
	}

	return NETDEV_TX_OK;

err_tx:
	kfree_skb(skb);
	return NETDEV_TX_OK;
}

netdev_tx_t
ieee802154_monitor_start_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;

	return ieee802154_tx(sdata->local, skb);
}

netdev_tx_t
ieee802154_subif_start_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) {
		netdev_warn(dev, "encryption failed: %i\n", rc);
		kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	skb->skb_iif = dev->ifindex;

	return ieee802154_tx(sdata->local, skb);
}
Commit	Line	Data
	1	/*
	2	* Copyright 2007-2012 Siemens AG
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2
	6	* as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* Written by:
	14	* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
	15	* Sergey Lapin <slapin@ossfans.org>
	16	* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
	17	* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
	18	*/
	19
	20	#include <linux/netdevice.h>
	21	#include <linux/if_arp.h>
	22	#include <linux/crc-ccitt.h>
	23	#include <asm/unaligned.h>
	24
	25	#include <net/rtnetlink.h>
	26	#include <net/ieee802154_netdev.h>
	27	#include <net/mac802154.h>
	28	#include <net/cfg802154.h>
	29
	30	#include "ieee802154_i.h"
	31	#include "driver-ops.h"
	32
	33	/* IEEE 802.15.4 transceivers can sleep during the xmit session, so process
	34	* packets through the workqueue.
	35	*/
	36	struct ieee802154_xmit_cb {
	37	struct sk_buff *skb;
	38	struct work_struct work;
	39	struct ieee802154_local *local;
	40	};
	41
	42	static struct ieee802154_xmit_cb ieee802154_xmit_cb;
	43
	44	static void ieee802154_xmit_worker(struct work_struct *work)
	45	{
	46	struct ieee802154_xmit_cb *cb =
	47	container_of(work, struct ieee802154_xmit_cb, work);
	48	struct ieee802154_local *local = cb->local;
	49	struct sk_buff *skb = cb->skb;
	50	struct net_device *dev = skb->dev;
	51	int res;
	52
	53	rtnl_lock();
	54
	55	/* check if ifdown occurred while schedule */
	56	if (!netif_running(dev))
	57	goto err_tx;
	58
	59	res = drv_xmit_sync(local, skb);
	60	if (res)
	61	goto err_tx;
	62
	63	ieee802154_xmit_complete(&local->hw, skb, false);
	64
	65	dev->stats.tx_packets++;
	66	dev->stats.tx_bytes += skb->len;
	67
	68	rtnl_unlock();
	69
	70	return;
	71
	72	err_tx:
	73	/* Restart the netif queue on each sub_if_data object. */
	74	ieee802154_wake_queue(&local->hw);
	75	rtnl_unlock();
	76	kfree_skb(skb);
	77	netdev_dbg(dev, "transmission failed\n");
	78	}
	79
	80	static netdev_tx_t
	81	ieee802154_tx(struct ieee802154_local local, struct sk_buff skb)
	82	{
	83	struct net_device *dev = skb->dev;
	84	int ret;
	85
	86	if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
	87	u16 crc = crc_ccitt(0, skb->data, skb->len);
	88
	89	put_unaligned_le16(crc, skb_put(skb, 2));
	90	}
	91
	92	if (skb_cow_head(skb, local->hw.extra_tx_headroom))
	93	goto err_tx;
	94
	95	/* Stop the netif queue on each sub_if_data object. */
	96	ieee802154_stop_queue(&local->hw);
	97
	98	/* async is priority, otherwise sync is fallback */
	99	if (local->ops->xmit_async) {
	100	ret = drv_xmit_async(local, skb);
	101	if (ret) {
	102	ieee802154_wake_queue(&local->hw);
	103	goto err_tx;
	104	}
	105
	106	dev->stats.tx_packets++;
	107	dev->stats.tx_bytes += skb->len;
	108	} else {
	109	INIT_WORK(&ieee802154_xmit_cb.work, ieee802154_xmit_worker);
	110	ieee802154_xmit_cb.skb = skb;
	111	ieee802154_xmit_cb.local = local;
	112
	113	queue_work(local->workqueue, &ieee802154_xmit_cb.work);
	114	}
	115
	116	return NETDEV_TX_OK;
	117
	118	err_tx:
	119	kfree_skb(skb);
	120	return NETDEV_TX_OK;
	121	}
	122
	123	netdev_tx_t
	124	ieee802154_monitor_start_xmit(struct sk_buff skb, struct net_device dev)
	125	{
	126	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	127
	128	skb->skb_iif = dev->ifindex;
	129
	130	return ieee802154_tx(sdata->local, skb);
	131	}
	132
	133	netdev_tx_t
	134	ieee802154_subif_start_xmit(struct sk_buff skb, struct net_device dev)
	135	{
	136	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
	137	int rc;
	138
	139	rc = mac802154_llsec_encrypt(&sdata->sec, skb);
	140	if (rc) {
	141	netdev_warn(dev, "encryption failed: %i\n", rc);
	142	kfree_skb(skb);
	143	return NETDEV_TX_OK;
	144	}
	145
	146	skb->skb_iif = dev->ifindex;
	147
	148	return ieee802154_tx(sdata->local, skb);
	149	}