[net-next-2.6.git] / net / mac80211 / status.c

/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2008-2010	Johannes Berg <johannes@sipsolutions.net>
 *
 * 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.
 */

#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "rate.h"
#include "mesh.h"
#include "led.h"


void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
				 struct sk_buff *skb)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int tmp;

	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
		       &local->skb_queue : &local->skb_queue_unreliable, skb);
	tmp = skb_queue_len(&local->skb_queue) +
		skb_queue_len(&local->skb_queue_unreliable);
	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
		dev_kfree_skb_irq(skb);
		tmp--;
		I802_DEBUG_INC(local->tx_status_drop);
	}
	tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);

static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
					    struct sta_info *sta,
					    struct sk_buff *skb)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

	/*
	 * This skb 'survived' a round-trip through the driver, and
	 * hopefully the driver didn't mangle it too badly. However,
	 * we can definitely not rely on the control information
	 * being correct. Clear it so we don't get junk there, and
	 * indicate that it needs new processing, but must not be
	 * modified/encrypted again.
	 */
	memset(&info->control, 0, sizeof(info->control));

	info->control.jiffies = jiffies;
	info->control.vif = &sta->sdata->vif;
	info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
		       IEEE80211_TX_INTFL_RETRANSMISSION;

	sta->tx_filtered_count++;

	/*
	 * Clear the TX filter mask for this STA when sending the next
	 * packet. If the STA went to power save mode, this will happen
	 * when it wakes up for the next time.
	 */
	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);

	/*
	 * This code races in the following way:
	 *
	 *  (1) STA sends frame indicating it will go to sleep and does so
	 *  (2) hardware/firmware adds STA to filter list, passes frame up
	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
	 *  (4) we get TX status before having processed the frame and
	 *	knowing that the STA has gone to sleep.
	 *
	 * This is actually quite unlikely even when both those events are
	 * processed from interrupts coming in quickly after one another or
	 * even at the same time because we queue both TX status events and
	 * RX frames to be processed by a tasklet and process them in the
	 * same order that they were received or TX status last. Hence, there
	 * is no race as long as the frame RX is processed before the next TX
	 * status, which drivers can ensure, see below.
	 *
	 * Note that this can only happen if the hardware or firmware can
	 * actually add STAs to the filter list, if this is done by the
	 * driver in response to set_tim() (which will only reduce the race
	 * this whole filtering tries to solve, not completely solve it)
	 * this situation cannot happen.
	 *
	 * To completely solve this race drivers need to make sure that they
	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
	 *	functions and
	 *  (b) always process RX events before TX status events if ordering
	 *      can be unknown, for example with different interrupt status
	 *	bits.
	 */
	if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
		skb_queue_tail(&sta->tx_filtered, skb);
		return;
	}

	if (!test_sta_flags(sta, WLAN_STA_PS_STA) &&
	    !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
		/* Software retry the packet once */
		info->flags |= IEEE80211_TX_INTFL_RETRIED;
		ieee80211_add_pending_skb(local, skb);
		return;
	}

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	if (net_ratelimit())
		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
		       "queue_len=%d PS=%d @%lu\n",
		       wiphy_name(local->hw.wiphy),
		       skb_queue_len(&sta->tx_filtered),
		       !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
#endif
	dev_kfree_skb(skb);
}

static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
{
	struct ieee80211_mgmt *mgmt = (void *) skb->data;
	struct ieee80211_local *local = sta->local;
	struct ieee80211_sub_if_data *sdata = sta->sdata;

	if (ieee80211_is_action(mgmt->frame_control) &&
	    sdata->vif.type == NL80211_IFTYPE_STATION &&
	    mgmt->u.action.category == WLAN_CATEGORY_HT &&
	    mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
		/*
		 * This update looks racy, but isn't -- if we come
		 * here we've definitely got a station that we're
		 * talking to, and on a managed interface that can
		 * only be the AP. And the only other place updating
		 * this variable is before we're associated.
		 */
		switch (mgmt->u.action.u.ht_smps.smps_control) {
		case WLAN_HT_SMPS_CONTROL_DYNAMIC:
			sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
			break;
		case WLAN_HT_SMPS_CONTROL_STATIC:
			sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
			break;
		case WLAN_HT_SMPS_CONTROL_DISABLED:
		default: /* shouldn't happen since we don't send that */
			sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
			break;
		}

		ieee80211_queue_work(&local->hw, &local->recalc_smps);
	}
}

void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
{
	struct sk_buff *skb2;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	u16 frag, type;
	__le16 fc;
	struct ieee80211_supported_band *sband;
	struct ieee80211_tx_status_rtap_hdr *rthdr;
	struct ieee80211_sub_if_data *sdata;
	struct net_device *prev_dev = NULL;
	struct sta_info *sta, *tmp;
	int retry_count = -1, i;
	int rates_idx = -1;
	bool send_to_cooked;

	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
		/* the HW cannot have attempted that rate */
		if (i >= hw->max_rates) {
			info->status.rates[i].idx = -1;
			info->status.rates[i].count = 0;
		} else if (info->status.rates[i].idx >= 0) {
			rates_idx = i;
		}

		retry_count += info->status.rates[i].count;
	}
	if (retry_count < 0)
		retry_count = 0;

	rcu_read_lock();

	sband = local->hw.wiphy->bands[info->band];
	fc = hdr->frame_control;

	for_each_sta_info(local, hdr->addr1, sta, tmp) {
		/* skip wrong virtual interface */
		if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
			continue;

		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
		    test_sta_flags(sta, WLAN_STA_PS_STA)) {
			/*
			 * The STA is in power save mode, so assume
			 * that this TX packet failed because of that.
			 */
			ieee80211_handle_filtered_frame(local, sta, skb);
			rcu_read_unlock();
			return;
		}

		if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
		    (rates_idx != -1))
			sta->last_tx_rate = info->status.rates[rates_idx];

		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
		    (ieee80211_is_data_qos(fc))) {
			u16 tid, ssn;
			u8 *qc;

			qc = ieee80211_get_qos_ctl(hdr);
			tid = qc[0] & 0xf;
			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
						& IEEE80211_SCTL_SEQ);
			ieee80211_send_bar(sta->sdata, hdr->addr1,
					   tid, ssn);
		}

		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
			ieee80211_handle_filtered_frame(local, sta, skb);
			rcu_read_unlock();
			return;
		} else {
			if (!(info->flags & IEEE80211_TX_STAT_ACK))
				sta->tx_retry_failed++;
			sta->tx_retry_count += retry_count;
		}

		rate_control_tx_status(local, sband, sta, skb);
		if (ieee80211_vif_is_mesh(&sta->sdata->vif))
			ieee80211s_update_metric(local, sta, skb);

		if (!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
		    (info->flags & IEEE80211_TX_STAT_ACK))
			ieee80211_frame_acked(sta, skb);
	}

	rcu_read_unlock();

	ieee80211_led_tx(local, 0);

	/* SNMP counters
	 * Fragments are passed to low-level drivers as separate skbs, so these
	 * are actually fragments, not frames. Update frame counters only for
	 * the first fragment of the frame. */

	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;

	if (info->flags & IEEE80211_TX_STAT_ACK) {
		if (frag == 0) {
			local->dot11TransmittedFrameCount++;
			if (is_multicast_ether_addr(hdr->addr1))
				local->dot11MulticastTransmittedFrameCount++;
			if (retry_count > 0)
				local->dot11RetryCount++;
			if (retry_count > 1)
				local->dot11MultipleRetryCount++;
		}

		/* This counter shall be incremented for an acknowledged MPDU
		 * with an individual address in the address 1 field or an MPDU
		 * with a multicast address in the address 1 field of type Data
		 * or Management. */
		if (!is_multicast_ether_addr(hdr->addr1) ||
		    type == IEEE80211_FTYPE_DATA ||
		    type == IEEE80211_FTYPE_MGMT)
			local->dot11TransmittedFragmentCount++;
	} else {
		if (frag == 0)
			local->dot11FailedCount++;
	}

	if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
	    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	    !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
	    local->ps_sdata && !(local->scanning)) {
		if (info->flags & IEEE80211_TX_STAT_ACK) {
			local->ps_sdata->u.mgd.flags |=
					IEEE80211_STA_NULLFUNC_ACKED;
			ieee80211_queue_work(&local->hw,
					&local->dynamic_ps_enable_work);
		} else
			mod_timer(&local->dynamic_ps_timer, jiffies +
					msecs_to_jiffies(10));
	}

	if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX)
		cfg80211_action_tx_status(
			skb->dev, (unsigned long) skb, skb->data, skb->len,
			!!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);

	/* this was a transmitted frame, but now we want to reuse it */
	skb_orphan(skb);

	/* Need to make a copy before skb->cb gets cleared */
	send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
			(type != IEEE80211_FTYPE_DATA);

	/*
	 * This is a bit racy but we can avoid a lot of work
	 * with this test...
	 */
	if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
		dev_kfree_skb(skb);
		return;
	}

	/* send frame to monitor interfaces now */

	if (skb_headroom(skb) < sizeof(*rthdr)) {
		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
		dev_kfree_skb(skb);
		return;
	}

	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
				skb_push(skb, sizeof(*rthdr));

	memset(rthdr, 0, sizeof(*rthdr));
	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
	rthdr->hdr.it_present =
		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
			    (1 << IEEE80211_RADIOTAP_RATE));

	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
	    !is_multicast_ether_addr(hdr->addr1))
		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);

	/*
	 * XXX: Once radiotap gets the bitmap reset thing the vendor
	 *	extensions proposal contains, we can actually report
	 *	the whole set of tries we did.
	 */
	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
	if (info->status.rates[0].idx >= 0 &&
	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
		rthdr->rate = sband->bitrates[
				info->status.rates[0].idx].bitrate / 5;

	/* for now report the total retry_count */
	rthdr->data_retries = retry_count;

	/* XXX: is this sufficient for BPF? */
	skb_set_mac_header(skb, 0);
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = htons(ETH_P_802_2);
	memset(skb->cb, 0, sizeof(skb->cb));

	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
			if (!ieee80211_sdata_running(sdata))
				continue;

			if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
			    !send_to_cooked)
				continue;

			if (prev_dev) {
				skb2 = skb_clone(skb, GFP_ATOMIC);
				if (skb2) {
					skb2->dev = prev_dev;
					netif_rx(skb2);
				}
			}

			prev_dev = sdata->dev;
		}
	}
	if (prev_dev) {
		skb->dev = prev_dev;
		netif_rx(skb);
		skb = NULL;
	}
	rcu_read_unlock();
	dev_kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_tx_status);
Commit	Line	Data
fe7a5d5c JB	1	/*
	2	* Copyright 2002-2005, Instant802 Networks, Inc.
	3	* Copyright 2005-2006, Devicescape Software, Inc.
	4	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
026331c4	5	* Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net>
fe7a5d5c JB	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <net/mac80211.h>
	13	#include "ieee80211_i.h"
	14	#include "rate.h"
	15	#include "mesh.h"
	16	#include "led.h"
	17
	18
	19	void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
	20	struct sk_buff *skb)
	21	{
	22	struct ieee80211_local *local = hw_to_local(hw);
	23	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	24	int tmp;
	25
	26	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
	27	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
	28	&local->skb_queue : &local->skb_queue_unreliable, skb);
	29	tmp = skb_queue_len(&local->skb_queue) +
	30	skb_queue_len(&local->skb_queue_unreliable);
	31	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
	32	(skb = skb_dequeue(&local->skb_queue_unreliable))) {
	33	dev_kfree_skb_irq(skb);
	34	tmp--;
	35	I802_DEBUG_INC(local->tx_status_drop);
	36	}
	37	tasklet_schedule(&local->tasklet);
	38	}
	39	EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
	40
	41	static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
	42	struct sta_info *sta,
	43	struct sk_buff *skb)
	44	{
	45	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	46
697e6a0f JB	47	/*
	48	* This skb 'survived' a round-trip through the driver, and
	49	* hopefully the driver didn't mangle it too badly. However,
77c2061d	50	* we can definitely not rely on the control information
c6fcf6bc JB	51	* being correct. Clear it so we don't get junk there, and
	52	* indicate that it needs new processing, but must not be
	53	* modified/encrypted again.
697e6a0f JB	54	*/
697e6a0f JB	55	memset(&info->control, 0, sizeof(info->control));
18c94907 JB	56
	57	info->control.jiffies = jiffies;
	58	info->control.vif = &sta->sdata->vif;
c6fcf6bc JB	59	info->flags \|= IEEE80211_TX_INTFL_NEED_TXPROCESSING \|
c6fcf6bc JB	60	IEEE80211_TX_INTFL_RETRANSMISSION;
697e6a0f	61
fe7a5d5c JB	62	sta->tx_filtered_count++;
	63
	64	/*
	65	* Clear the TX filter mask for this STA when sending the next
	66	* packet. If the STA went to power save mode, this will happen
	67	* when it wakes up for the next time.
	68	*/
	69	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
	70
	71	/*
	72	* This code races in the following way:
	73	*
	74	* (1) STA sends frame indicating it will go to sleep and does so
	75	* (2) hardware/firmware adds STA to filter list, passes frame up
	76	* (3) hardware/firmware processes TX fifo and suppresses a frame
	77	* (4) we get TX status before having processed the frame and
	78	* knowing that the STA has gone to sleep.
	79	*
	80	* This is actually quite unlikely even when both those events are
	81	* processed from interrupts coming in quickly after one another or
	82	* even at the same time because we queue both TX status events and
	83	* RX frames to be processed by a tasklet and process them in the
	84	* same order that they were received or TX status last. Hence, there
	85	* is no race as long as the frame RX is processed before the next TX
	86	* status, which drivers can ensure, see below.
	87	*
	88	* Note that this can only happen if the hardware or firmware can
	89	* actually add STAs to the filter list, if this is done by the
	90	* driver in response to set_tim() (which will only reduce the race
	91	* this whole filtering tries to solve, not completely solve it)
	92	* this situation cannot happen.
	93	*
	94	* To completely solve this race drivers need to make sure that they
	95	* (a) don't mix the irq-safe/not irq-safe TX status/RX processing
	96	* functions and
	97	* (b) always process RX events before TX status events if ordering
	98	* can be unknown, for example with different interrupt status
	99	* bits.
	100	*/
	101	if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
	102	skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
	103	skb_queue_tail(&sta->tx_filtered, skb);
	104	return;
	105	}
	106
	107	if (!test_sta_flags(sta, WLAN_STA_PS_STA) &&
	108	!(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
	109	/* Software retry the packet once */
	110	info->flags \|= IEEE80211_TX_INTFL_RETRIED;
	111	ieee80211_add_pending_skb(local, skb);
	112	return;
	113	}
	114
fe7a5d5c JB	115	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	116	if (net_ratelimit())
	117	printk(KERN_DEBUG "%s: dropped TX filtered frame, "
	118	"queue_len=%d PS=%d @%lu\n",
	119	wiphy_name(local->hw.wiphy),
	120	skb_queue_len(&sta->tx_filtered),
	121	!!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
	122	#endif
	123	dev_kfree_skb(skb);
	124	}
	125
0f78231b JB	126	static void ieee80211_frame_acked(struct sta_info sta, struct sk_buff skb)
	127	{
	128	struct ieee80211_mgmt mgmt = (void ) skb->data;
	129	struct ieee80211_local *local = sta->local;
	130	struct ieee80211_sub_if_data *sdata = sta->sdata;
	131
	132	if (ieee80211_is_action(mgmt->frame_control) &&
	133	sdata->vif.type == NL80211_IFTYPE_STATION &&
	134	mgmt->u.action.category == WLAN_CATEGORY_HT &&
	135	mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
	136	/*
	137	* This update looks racy, but isn't -- if we come
	138	* here we've definitely got a station that we're
	139	* talking to, and on a managed interface that can
	140	* only be the AP. And the only other place updating
	141	* this variable is before we're associated.
	142	*/
	143	switch (mgmt->u.action.u.ht_smps.smps_control) {
	144	case WLAN_HT_SMPS_CONTROL_DYNAMIC:
	145	sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
	146	break;
	147	case WLAN_HT_SMPS_CONTROL_STATIC:
	148	sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
	149	break;
	150	case WLAN_HT_SMPS_CONTROL_DISABLED:
	151	default: /* shouldn't happen since we don't send that */
	152	sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
	153	break;
	154	}
	155
	156	ieee80211_queue_work(&local->hw, &local->recalc_smps);
	157	}
	158	}
	159
fe7a5d5c JB	160	void ieee80211_tx_status(struct ieee80211_hw hw, struct sk_buff skb)
	161	{
	162	struct sk_buff *skb2;
	163	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	164	struct ieee80211_local *local = hw_to_local(hw);
	165	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	166	u16 frag, type;
	167	__le16 fc;
	168	struct ieee80211_supported_band *sband;
	169	struct ieee80211_tx_status_rtap_hdr *rthdr;
	170	struct ieee80211_sub_if_data *sdata;
	171	struct net_device *prev_dev = NULL;
abe60632	172	struct sta_info sta, tmp;
fe7a5d5c	173	int retry_count = -1, i;
0c869808	174	int rates_idx = -1;
eaf55530	175	bool send_to_cooked;
fe7a5d5c JB	176
	177	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
	178	/* the HW cannot have attempted that rate */
	179	if (i >= hw->max_rates) {
	180	info->status.rates[i].idx = -1;
	181	info->status.rates[i].count = 0;
0c869808 JO	182	} else if (info->status.rates[i].idx >= 0) {
0c869808 JO	183	rates_idx = i;
fe7a5d5c JB	184	}
	185
	186	retry_count += info->status.rates[i].count;
	187	}
	188	if (retry_count < 0)
	189	retry_count = 0;
	190
	191	rcu_read_lock();
	192
	193	sband = local->hw.wiphy->bands[info->band];
375177bf	194	fc = hdr->frame_control;
fe7a5d5c	195
abe60632 JB	196	for_each_sta_info(local, hdr->addr1, sta, tmp) {
abe60632 JB	197	/* skip wrong virtual interface */
47846c9b	198	if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
abe60632	199	continue;
fe7a5d5c	200
fe7a5d5c JB	201	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
	202	test_sta_flags(sta, WLAN_STA_PS_STA)) {
	203	/*
	204	* The STA is in power save mode, so assume
	205	* that this TX packet failed because of that.
	206	*/
	207	ieee80211_handle_filtered_frame(local, sta, skb);
	208	rcu_read_unlock();
	209	return;
	210	}
	211
0c869808 JO	212	if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
	213	(rates_idx != -1))
	214	sta->last_tx_rate = info->status.rates[rates_idx];
	215
fe7a5d5c JB	216	if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
	217	(ieee80211_is_data_qos(fc))) {
	218	u16 tid, ssn;
	219	u8 *qc;
	220
	221	qc = ieee80211_get_qos_ctl(hdr);
	222	tid = qc[0] & 0xf;
	223	ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
	224	& IEEE80211_SCTL_SEQ);
	225	ieee80211_send_bar(sta->sdata, hdr->addr1,
	226	tid, ssn);
	227	}
	228
	229	if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
	230	ieee80211_handle_filtered_frame(local, sta, skb);
	231	rcu_read_unlock();
	232	return;
	233	} else {
	234	if (!(info->flags & IEEE80211_TX_STAT_ACK))
	235	sta->tx_retry_failed++;
	236	sta->tx_retry_count += retry_count;
	237	}
	238
	239	rate_control_tx_status(local, sband, sta, skb);
	240	if (ieee80211_vif_is_mesh(&sta->sdata->vif))
	241	ieee80211s_update_metric(local, sta, skb);
0f78231b JB	242
	243	if (!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
	244	(info->flags & IEEE80211_TX_STAT_ACK))
	245	ieee80211_frame_acked(sta, skb);
fe7a5d5c JB	246	}
	247
	248	rcu_read_unlock();
	249
	250	ieee80211_led_tx(local, 0);
	251
	252	/* SNMP counters
	253	* Fragments are passed to low-level drivers as separate skbs, so these
	254	* are actually fragments, not frames. Update frame counters only for
	255	* the first fragment of the frame. */
	256
	257	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
	258	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
	259
	260	if (info->flags & IEEE80211_TX_STAT_ACK) {
	261	if (frag == 0) {
	262	local->dot11TransmittedFrameCount++;
	263	if (is_multicast_ether_addr(hdr->addr1))
	264	local->dot11MulticastTransmittedFrameCount++;
	265	if (retry_count > 0)
	266	local->dot11RetryCount++;
	267	if (retry_count > 1)
	268	local->dot11MultipleRetryCount++;
	269	}
	270
	271	/* This counter shall be incremented for an acknowledged MPDU
	272	* with an individual address in the address 1 field or an MPDU
	273	* with a multicast address in the address 1 field of type Data
	274	* or Management. */
	275	if (!is_multicast_ether_addr(hdr->addr1) \|\|
	276	type == IEEE80211_FTYPE_DATA \|\|
	277	type == IEEE80211_FTYPE_MGMT)
	278	local->dot11TransmittedFragmentCount++;
	279	} else {
	280	if (frag == 0)
	281	local->dot11FailedCount++;
	282	}
	283
375177bf VN	284	if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
	285	(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	286	!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
	287	local->ps_sdata && !(local->scanning)) {
	288	if (info->flags & IEEE80211_TX_STAT_ACK) {
	289	local->ps_sdata->u.mgd.flags \|=
	290	IEEE80211_STA_NULLFUNC_ACKED;
	291	ieee80211_queue_work(&local->hw,
	292	&local->dynamic_ps_enable_work);
	293	} else
	294	mod_timer(&local->dynamic_ps_timer, jiffies +
	295	msecs_to_jiffies(10));
	296	}
	297
026331c4 JM	298	if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX)
	299	cfg80211_action_tx_status(
	300	skb->dev, (unsigned long) skb, skb->data, skb->len,
	301	!!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
	302
fe7a5d5c JB	303	/* this was a transmitted frame, but now we want to reuse it */
	304	skb_orphan(skb);
	305
eaf55530 FF	306	/* Need to make a copy before skb->cb gets cleared */
	307	send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) \|\|
	308	(type != IEEE80211_FTYPE_DATA);
	309
fe7a5d5c JB	310	/*
	311	* This is a bit racy but we can avoid a lot of work
	312	* with this test...
	313	*/
eaf55530	314	if (!local->monitors && (!send_to_cooked \|\| !local->cooked_mntrs)) {
fe7a5d5c JB	315	dev_kfree_skb(skb);
	316	return;
	317	}
	318
	319	/* send frame to monitor interfaces now */
	320
	321	if (skb_headroom(skb) < sizeof(*rthdr)) {
	322	printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
	323	dev_kfree_skb(skb);
	324	return;
	325	}
	326
	327	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
	328	skb_push(skb, sizeof(*rthdr));
	329
	330	memset(rthdr, 0, sizeof(*rthdr));
	331	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
	332	rthdr->hdr.it_present =
	333	cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) \|
	334	(1 << IEEE80211_RADIOTAP_DATA_RETRIES) \|
	335	(1 << IEEE80211_RADIOTAP_RATE));
	336
	337	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
	338	!is_multicast_ether_addr(hdr->addr1))
	339	rthdr->tx_flags \|= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
	340
	341	/*
	342	* XXX: Once radiotap gets the bitmap reset thing the vendor
	343	* extensions proposal contains, we can actually report
	344	* the whole set of tries we did.
	345	*/
	346	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) \|\|
	347	(info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
	348	rthdr->tx_flags \|= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
	349	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
	350	rthdr->tx_flags \|= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
	351	if (info->status.rates[0].idx >= 0 &&
	352	!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
	353	rthdr->rate = sband->bitrates[
	354	info->status.rates[0].idx].bitrate / 5;
	355
	356	/* for now report the total retry_count */
	357	rthdr->data_retries = retry_count;
	358
	359	/* XXX: is this sufficient for BPF? */
	360	skb_set_mac_header(skb, 0);
	361	skb->ip_summed = CHECKSUM_UNNECESSARY;
	362	skb->pkt_type = PACKET_OTHERHOST;
	363	skb->protocol = htons(ETH_P_802_2);
	364	memset(skb->cb, 0, sizeof(skb->cb));
	365
	366	rcu_read_lock();
	367	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	368	if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
9607e6b6	369	if (!ieee80211_sdata_running(sdata))
fe7a5d5c JB	370	continue;
	371
	372	if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
eaf55530	373	!send_to_cooked)
fe7a5d5c JB	374	continue;
	375
	376	if (prev_dev) {
	377	skb2 = skb_clone(skb, GFP_ATOMIC);
	378	if (skb2) {
	379	skb2->dev = prev_dev;
4efe7f51	380	netif_rx(skb2);
fe7a5d5c JB	381	}
	382	}
	383
	384	prev_dev = sdata->dev;
	385	}
	386	}
	387	if (prev_dev) {
	388	skb->dev = prev_dev;
4efe7f51	389	netif_rx(skb);
fe7a5d5c JB	390	skb = NULL;
	391	}
	392	rcu_read_unlock();
	393	dev_kfree_skb(skb);
	394	}
	395	EXPORT_SYMBOL(ieee80211_tx_status);