1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright 2002-2005, Instant802 Networks, Inc.
   4 * Copyright 2005-2006, Devicescape Software, Inc.
   5 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
   6 * Copyright 2008-2010	Johannes Berg <johannes@sipsolutions.net>
   7 * Copyright 2013-2014  Intel Mobile Communications GmbH
   8 */
   9
  10#include <linux/export.h>
  11#include <linux/etherdevice.h>
  12#include <net/mac80211.h>
  13#include <asm/unaligned.h>
  14#include "ieee80211_i.h"
  15#include "rate.h"
  16#include "mesh.h"
  17#include "led.h"
  18#include "wme.h"
  19
  20
  21void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
  22				 struct sk_buff *skb)
  23{
  24	struct ieee80211_local *local = hw_to_local(hw);
  25	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  26	int tmp;
  27
  28	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
  29	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
  30		       &local->skb_queue : &local->skb_queue_unreliable, skb);
  31	tmp = skb_queue_len(&local->skb_queue) +
  32		skb_queue_len(&local->skb_queue_unreliable);
  33	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
  34	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  35		ieee80211_free_txskb(hw, skb);
  36		tmp--;
  37		I802_DEBUG_INC(local->tx_status_drop);
  38	}
  39	tasklet_schedule(&local->tasklet);
  40}
  41EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
  42
  43static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
  44					    struct sta_info *sta,
  45					    struct sk_buff *skb)
  46{
  47	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  48	struct ieee80211_hdr *hdr = (void *)skb->data;
  49	int ac;
  50
  51	if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
  52			   IEEE80211_TX_CTL_AMPDU)) {
  53		ieee80211_free_txskb(&local->hw, skb);
  54		return;
  55	}
  56
  57	/*
  58	 * This skb 'survived' a round-trip through the driver, and
  59	 * hopefully the driver didn't mangle it too badly. However,
  60	 * we can definitely not rely on the control information
  61	 * being correct. Clear it so we don't get junk there, and
  62	 * indicate that it needs new processing, but must not be
  63	 * modified/encrypted again.
  64	 */
  65	memset(&info->control, 0, sizeof(info->control));
  66
  67	info->control.jiffies = jiffies;
  68	info->control.vif = &sta->sdata->vif;
  69	info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
  70		       IEEE80211_TX_INTFL_RETRANSMISSION;
  71	info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  72
  73	sta->status_stats.filtered++;
  74
  75	/*
  76	 * Clear more-data bit on filtered frames, it might be set
  77	 * but later frames might time out so it might have to be
  78	 * clear again ... It's all rather unlikely (this frame
  79	 * should time out first, right?) but let's not confuse
  80	 * peers unnecessarily.
  81	 */
  82	if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
  83		hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  84
  85	if (ieee80211_is_data_qos(hdr->frame_control)) {
  86		u8 *p = ieee80211_get_qos_ctl(hdr);
  87		int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
  88
  89		/*
  90		 * Clear EOSP if set, this could happen e.g.
  91		 * if an absence period (us being a P2P GO)
  92		 * shortens the SP.
  93		 */
  94		if (*p & IEEE80211_QOS_CTL_EOSP)
  95			*p &= ~IEEE80211_QOS_CTL_EOSP;
  96		ac = ieee80211_ac_from_tid(tid);
  97	} else {
  98		ac = IEEE80211_AC_BE;
  99	}
 100
 101	/*
 102	 * Clear the TX filter mask for this STA when sending the next
 103	 * packet. If the STA went to power save mode, this will happen
 104	 * when it wakes up for the next time.
 105	 */
 106	set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
 107	ieee80211_clear_fast_xmit(sta);
 108
 109	/*
 110	 * This code races in the following way:
 111	 *
 112	 *  (1) STA sends frame indicating it will go to sleep and does so
 113	 *  (2) hardware/firmware adds STA to filter list, passes frame up
 114	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
 115	 *  (4) we get TX status before having processed the frame and
 116	 *	knowing that the STA has gone to sleep.
 117	 *
 118	 * This is actually quite unlikely even when both those events are
 119	 * processed from interrupts coming in quickly after one another or
 120	 * even at the same time because we queue both TX status events and
 121	 * RX frames to be processed by a tasklet and process them in the
 122	 * same order that they were received or TX status last. Hence, there
 123	 * is no race as long as the frame RX is processed before the next TX
 124	 * status, which drivers can ensure, see below.
 125	 *
 126	 * Note that this can only happen if the hardware or firmware can
 127	 * actually add STAs to the filter list, if this is done by the
 128	 * driver in response to set_tim() (which will only reduce the race
 129	 * this whole filtering tries to solve, not completely solve it)
 130	 * this situation cannot happen.
 131	 *
 132	 * To completely solve this race drivers need to make sure that they
 133	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 134	 *	functions and
 135	 *  (b) always process RX events before TX status events if ordering
 136	 *      can be unknown, for example with different interrupt status
 137	 *	bits.
 138	 *  (c) if PS mode transitions are manual (i.e. the flag
 139	 *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
 140	 *      changes before calling TX status events if ordering can be
 141	 *	unknown.
 142	 */
 143	if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
 144	    skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
 145		skb_queue_tail(&sta->tx_filtered[ac], skb);
 146		sta_info_recalc_tim(sta);
 147
 148		if (!timer_pending(&local->sta_cleanup))
 149			mod_timer(&local->sta_cleanup,
 150				  round_jiffies(jiffies +
 151						STA_INFO_CLEANUP_INTERVAL));
 152		return;
 153	}
 154
 155	if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
 156	    !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 157		/* Software retry the packet once */
 158		info->flags |= IEEE80211_TX_INTFL_RETRIED;
 159		ieee80211_add_pending_skb(local, skb);
 160		return;
 161	}
 162
 163	ps_dbg_ratelimited(sta->sdata,
 164			   "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
 165			   skb_queue_len(&sta->tx_filtered[ac]),
 166			   !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
 167	ieee80211_free_txskb(&local->hw, skb);
 168}
 169
 170static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
 171{
 172	struct tid_ampdu_tx *tid_tx;
 173
 174	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 175	if (!tid_tx || !tid_tx->bar_pending)
 176		return;
 177
 178	tid_tx->bar_pending = false;
 179	ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
 180}
 181
 182static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
 183{
 184	struct ieee80211_mgmt *mgmt = (void *) skb->data;
 185	struct ieee80211_local *local = sta->local;
 186	struct ieee80211_sub_if_data *sdata = sta->sdata;
 187	struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
 188
 189	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
 190		sta->status_stats.last_ack = jiffies;
 191		if (txinfo->status.is_valid_ack_signal) {
 192			sta->status_stats.last_ack_signal =
 193					 (s8)txinfo->status.ack_signal;
 194			sta->status_stats.ack_signal_filled = true;
 195			ewma_avg_signal_add(&sta->status_stats.avg_ack_signal,
 196					    -txinfo->status.ack_signal);
 197		}
 198	}
 199
 200	if (ieee80211_is_data_qos(mgmt->frame_control)) {
 201		struct ieee80211_hdr *hdr = (void *) skb->data;
 202		u8 *qc = ieee80211_get_qos_ctl(hdr);
 203		u16 tid = qc[0] & 0xf;
 204
 205		ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 206	}
 207
 208	if (ieee80211_is_action(mgmt->frame_control) &&
 209	    !ieee80211_has_protected(mgmt->frame_control) &&
 210	    mgmt->u.action.category == WLAN_CATEGORY_HT &&
 211	    mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 212	    ieee80211_sdata_running(sdata)) {
 213		enum ieee80211_smps_mode smps_mode;
 214
 215		switch (mgmt->u.action.u.ht_smps.smps_control) {
 216		case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 217			smps_mode = IEEE80211_SMPS_DYNAMIC;
 218			break;
 219		case WLAN_HT_SMPS_CONTROL_STATIC:
 220			smps_mode = IEEE80211_SMPS_STATIC;
 221			break;
 222		case WLAN_HT_SMPS_CONTROL_DISABLED:
 223		default: /* shouldn't happen since we don't send that */
 224			smps_mode = IEEE80211_SMPS_OFF;
 225			break;
 226		}
 227
 228		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 229			/*
 230			 * This update looks racy, but isn't -- if we come
 231			 * here we've definitely got a station that we're
 232			 * talking to, and on a managed interface that can
 233			 * only be the AP. And the only other place updating
 234			 * this variable in managed mode is before association.
 235			 */
 236			sdata->smps_mode = smps_mode;
 237			ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 238		} else if (sdata->vif.type == NL80211_IFTYPE_AP ||
 239			   sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 240			sta->known_smps_mode = smps_mode;
 241		}
 242	}
 243}
 244
 245static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 246{
 247	struct tid_ampdu_tx *tid_tx;
 248
 249	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 250	if (!tid_tx)
 251		return;
 252
 253	tid_tx->failed_bar_ssn = ssn;
 254	tid_tx->bar_pending = true;
 255}
 256
 257static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
 258				     struct ieee80211_tx_status *status)
 259{
 260	int len = sizeof(struct ieee80211_radiotap_header);
 261
 262	/* IEEE80211_RADIOTAP_RATE rate */
 263	if (status && status->rate && !(status->rate->flags &
 264					(RATE_INFO_FLAGS_MCS |
 265					 RATE_INFO_FLAGS_DMG |
 266					 RATE_INFO_FLAGS_EDMG |
 267					 RATE_INFO_FLAGS_VHT_MCS |
 268					 RATE_INFO_FLAGS_HE_MCS)))
 269		len += 2;
 270	else if (info->status.rates[0].idx >= 0 &&
 271		 !(info->status.rates[0].flags &
 272		   (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
 273		len += 2;
 274
 275	/* IEEE80211_RADIOTAP_TX_FLAGS */
 276	len += 2;
 277
 278	/* IEEE80211_RADIOTAP_DATA_RETRIES */
 279	len += 1;
 280
 281	/* IEEE80211_RADIOTAP_MCS
 282	 * IEEE80211_RADIOTAP_VHT */
 283	if (status && status->rate) {
 284		if (status->rate->flags & RATE_INFO_FLAGS_MCS)
 285			len += 3;
 286		else if (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)
 287			len = ALIGN(len, 2) + 12;
 288		else if (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)
 289			len = ALIGN(len, 2) + 12;
 290	} else if (info->status.rates[0].idx >= 0) {
 291		if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 292			len += 3;
 293		else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 294			len = ALIGN(len, 2) + 12;
 295	}
 296
 297	return len;
 298}
 299
 300static void
 301ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 302				 struct ieee80211_supported_band *sband,
 303				 struct sk_buff *skb, int retry_count,
 304				 int rtap_len, int shift,
 305				 struct ieee80211_tx_status *status)
 306{
 307	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 308	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 309	struct ieee80211_radiotap_header *rthdr;
 310	unsigned char *pos;
 311	u16 legacy_rate = 0;
 312	u16 txflags;
 313
 314	rthdr = skb_push(skb, rtap_len);
 315
 316	memset(rthdr, 0, rtap_len);
 317	rthdr->it_len = cpu_to_le16(rtap_len);
 318	rthdr->it_present =
 319		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 320			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 321	pos = (unsigned char *)(rthdr + 1);
 322
 323	/*
 324	 * XXX: Once radiotap gets the bitmap reset thing the vendor
 325	 *	extensions proposal contains, we can actually report
 326	 *	the whole set of tries we did.
 327	 */
 328
 329	/* IEEE80211_RADIOTAP_RATE */
 330
 331	if (status && status->rate) {
 332		if (!(status->rate->flags & (RATE_INFO_FLAGS_MCS |
 333					     RATE_INFO_FLAGS_DMG |
 334					     RATE_INFO_FLAGS_EDMG |
 335					     RATE_INFO_FLAGS_VHT_MCS |
 336					     RATE_INFO_FLAGS_HE_MCS)))
 337			legacy_rate = status->rate->legacy;
 338	} else if (info->status.rates[0].idx >= 0 &&
 339		 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 340						  IEEE80211_TX_RC_VHT_MCS)))
 341		legacy_rate =
 342			sband->bitrates[info->status.rates[0].idx].bitrate;
 343
 344	if (legacy_rate) {
 345		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 346		*pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
 347		/* padding for tx flags */
 348		pos += 2;
 349	}
 350
 351	/* IEEE80211_RADIOTAP_TX_FLAGS */
 352	txflags = 0;
 353	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 354	    !is_multicast_ether_addr(hdr->addr1))
 355		txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 356
 357	if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 358		txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 359	if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 360		txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 361
 362	put_unaligned_le16(txflags, pos);
 363	pos += 2;
 364
 365	/* IEEE80211_RADIOTAP_DATA_RETRIES */
 366	/* for now report the total retry_count */
 367	*pos = retry_count;
 368	pos++;
 369
 370	if (status && status->rate &&
 371	    (status->rate->flags & RATE_INFO_FLAGS_MCS)) {
 372		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 373		pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 374			 IEEE80211_RADIOTAP_MCS_HAVE_GI |
 375			 IEEE80211_RADIOTAP_MCS_HAVE_BW;
 376		if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 377			pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 378		if (status->rate->bw == RATE_INFO_BW_40)
 379			pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 380		pos[2] = status->rate->mcs;
 381		pos += 3;
 382	} else if (status && status->rate &&
 383		   (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)) {
 384		u16 known = local->hw.radiotap_vht_details &
 385			(IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 386			 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 387
 388		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 389
 390		/* required alignment from rthdr */
 391		pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 392
 393		/* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 394		put_unaligned_le16(known, pos);
 395		pos += 2;
 396
 397		/* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 398		if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 399			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 400		pos++;
 401
 402		/* u8 bandwidth */
 403		switch (status->rate->bw) {
 404		case RATE_INFO_BW_160:
 405			*pos = 11;
 406			break;
 407		case RATE_INFO_BW_80:
 408			*pos = 4;
 409			break;
 410		case RATE_INFO_BW_40:
 411			*pos = 1;
 412			break;
 413		default:
 414			*pos = 0;
 415			break;
 416		}
 417		pos++;
 418
 419		/* u8 mcs_nss[4] */
 420		*pos = (status->rate->mcs << 4) | status->rate->nss;
 421		pos += 4;
 422
 423		/* u8 coding */
 424		pos++;
 425		/* u8 group_id */
 426		pos++;
 427		/* u16 partial_aid */
 428		pos += 2;
 429	} else if (status && status->rate &&
 430		   (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)) {
 431		struct ieee80211_radiotap_he *he;
 432
 433		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 434
 435		/* required alignment from rthdr */
 436		pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 437		he = (struct ieee80211_radiotap_he *)pos;
 438
 439		he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
 440					IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
 441					IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
 442					IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
 443
 444		he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
 445
 446#define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 447
 448		he->data6 |= HE_PREP(DATA6_NSTS, status->rate->nss);
 449
 450#define CHECK_GI(s) \
 451	BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 452	(int)NL80211_RATE_INFO_HE_GI_##s)
 453
 454		CHECK_GI(0_8);
 455		CHECK_GI(1_6);
 456		CHECK_GI(3_2);
 457
 458		he->data3 |= HE_PREP(DATA3_DATA_MCS, status->rate->mcs);
 459		he->data3 |= HE_PREP(DATA3_DATA_DCM, status->rate->he_dcm);
 460
 461		he->data5 |= HE_PREP(DATA5_GI, status->rate->he_gi);
 462
 463		switch (status->rate->bw) {
 464		case RATE_INFO_BW_20:
 465			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 466					     IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 467			break;
 468		case RATE_INFO_BW_40:
 469			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 470					     IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 471			break;
 472		case RATE_INFO_BW_80:
 473			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 474					     IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 475			break;
 476		case RATE_INFO_BW_160:
 477			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 478					     IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 479			break;
 480		case RATE_INFO_BW_HE_RU:
 481#define CHECK_RU_ALLOC(s) \
 482	BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 483	NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 484
 485			CHECK_RU_ALLOC(26);
 486			CHECK_RU_ALLOC(52);
 487			CHECK_RU_ALLOC(106);
 488			CHECK_RU_ALLOC(242);
 489			CHECK_RU_ALLOC(484);
 490			CHECK_RU_ALLOC(996);
 491			CHECK_RU_ALLOC(2x996);
 492
 493			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 494					     status->rate->he_ru_alloc + 4);
 495			break;
 496		default:
 497			WARN_ONCE(1, "Invalid SU BW %d\n", status->rate->bw);
 498		}
 499
 500		pos += sizeof(struct ieee80211_radiotap_he);
 501	}
 502
 503	if ((status && status->rate) || info->status.rates[0].idx < 0)
 504		return;
 505
 506	/* IEEE80211_RADIOTAP_MCS
 507	 * IEEE80211_RADIOTAP_VHT */
 508	if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 509		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 510		pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 511			 IEEE80211_RADIOTAP_MCS_HAVE_GI |
 512			 IEEE80211_RADIOTAP_MCS_HAVE_BW;
 513		if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 514			pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 515		if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 516			pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 517		if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 518			pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 519		pos[2] = info->status.rates[0].idx;
 520		pos += 3;
 521	} else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 522		u16 known = local->hw.radiotap_vht_details &
 523			(IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 524			 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 525
 526		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 527
 528		/* required alignment from rthdr */
 529		pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 530
 531		/* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 532		put_unaligned_le16(known, pos);
 533		pos += 2;
 534
 535		/* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 536		if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 537			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 538		pos++;
 539
 540		/* u8 bandwidth */
 541		if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 542			*pos = 1;
 543		else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 544			*pos = 4;
 545		else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 546			*pos = 11;
 547		else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 548			*pos = 0;
 549		pos++;
 550
 551		/* u8 mcs_nss[4] */
 552		*pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 553			ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 554		pos += 4;
 555
 556		/* u8 coding */
 557		pos++;
 558		/* u8 group_id */
 559		pos++;
 560		/* u16 partial_aid */
 561		pos += 2;
 562	}
 563}
 564
 565/*
 566 * Handles the tx for TDLS teardown frames.
 567 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 568 */
 569static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 570					struct ieee80211_sub_if_data *sdata,
 571					struct sk_buff *skb, u32 flags)
 572{
 573	struct sk_buff *teardown_skb;
 574	struct sk_buff *orig_teardown_skb;
 575	bool is_teardown = false;
 576
 577	/* Get the teardown data we need and free the lock */
 578	spin_lock(&sdata->u.mgd.teardown_lock);
 579	teardown_skb = sdata->u.mgd.teardown_skb;
 580	orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 581	if ((skb == orig_teardown_skb) && teardown_skb) {
 582		sdata->u.mgd.teardown_skb = NULL;
 583		sdata->u.mgd.orig_teardown_skb = NULL;
 584		is_teardown = true;
 585	}
 586	spin_unlock(&sdata->u.mgd.teardown_lock);
 587
 588	if (is_teardown) {
 589		/* This mechanism relies on being able to get ACKs */
 590		WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 591
 592		/* Check if peer has ACKed */
 593		if (flags & IEEE80211_TX_STAT_ACK) {
 594			dev_kfree_skb_any(teardown_skb);
 595		} else {
 596			tdls_dbg(sdata,
 597				 "TDLS Resending teardown through AP\n");
 598
 599			ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 600		}
 601	}
 602}
 603
 604static struct ieee80211_sub_if_data *
 605ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 606{
 607	struct ieee80211_sub_if_data *sdata;
 608
 609	if (skb->dev) {
 610		list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 611			if (!sdata->dev)
 612				continue;
 613
 614			if (skb->dev == sdata->dev)
 615				return sdata;
 616		}
 617
 618		return NULL;
 619	}
 620
 621	return rcu_dereference(local->p2p_sdata);
 622}
 623
 624static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 625				     struct ieee80211_tx_info *info,
 626				     bool acked, bool dropped)
 627{
 628	struct sk_buff *skb;
 629	unsigned long flags;
 630
 631	spin_lock_irqsave(&local->ack_status_lock, flags);
 632	skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
 633	spin_unlock_irqrestore(&local->ack_status_lock, flags);
 634
 635	if (!skb)
 636		return;
 637
 638	if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 639		u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 640		struct ieee80211_sub_if_data *sdata;
 641		struct ieee80211_hdr *hdr = (void *)skb->data;
 642		__be16 ethertype = 0;
 643
 644		if (skb->len >= ETH_HLEN && skb->protocol == cpu_to_be16(ETH_P_802_3))
 645			skb_copy_bits(skb, 2 * ETH_ALEN, &ethertype, ETH_TLEN);
 646
 647		rcu_read_lock();
 648		sdata = ieee80211_sdata_from_skb(local, skb);
 649		if (sdata) {
 650			if (ethertype == sdata->control_port_protocol ||
 651			    ethertype == cpu_to_be16(ETH_P_PREAUTH))
 652				cfg80211_control_port_tx_status(&sdata->wdev,
 653								cookie,
 654								skb->data,
 655								skb->len,
 656								acked,
 657								GFP_ATOMIC);
 658			else if (ieee80211_is_any_nullfunc(hdr->frame_control))
 659				cfg80211_probe_status(sdata->dev, hdr->addr1,
 660						      cookie, acked,
 661						      info->status.ack_signal,
 662						      info->status.is_valid_ack_signal,
 663						      GFP_ATOMIC);
 664			else if (ieee80211_is_mgmt(hdr->frame_control))
 665				cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
 666							skb->data, skb->len,
 667							acked, GFP_ATOMIC);
 668			else
 669				pr_warn("Unknown status report in ack skb\n");
 670
 671		}
 672		rcu_read_unlock();
 673
 674		dev_kfree_skb_any(skb);
 675	} else if (dropped) {
 676		dev_kfree_skb_any(skb);
 677	} else {
 678		/* consumes skb */
 679		skb_complete_wifi_ack(skb, acked);
 680	}
 681}
 682
 683static void ieee80211_report_used_skb(struct ieee80211_local *local,
 684				      struct sk_buff *skb, bool dropped)
 685{
 686	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 687	u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
 688	struct ieee80211_hdr *hdr = (void *)skb->data;
 689	bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 690
 691	if (dropped)
 692		acked = false;
 693
 694	if (tx_time_est) {
 695		struct sta_info *sta;
 696
 697		rcu_read_lock();
 698
 699		sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
 700		ieee80211_sta_update_pending_airtime(local, sta,
 701						     skb_get_queue_mapping(skb),
 702						     tx_time_est,
 703						     true);
 704		rcu_read_unlock();
 705	}
 706
 707	if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 708		struct ieee80211_sub_if_data *sdata;
 709
 710		rcu_read_lock();
 711
 712		sdata = ieee80211_sdata_from_skb(local, skb);
 713
 714		if (!sdata) {
 715			skb->dev = NULL;
 716		} else {
 717			unsigned int hdr_size =
 718				ieee80211_hdrlen(hdr->frame_control);
 719
 720			/* Check to see if packet is a TDLS teardown packet */
 721			if (ieee80211_is_data(hdr->frame_control) &&
 722			    (ieee80211_get_tdls_action(skb, hdr_size) ==
 723			     WLAN_TDLS_TEARDOWN))
 724				ieee80211_tdls_td_tx_handle(local, sdata, skb,
 725							    info->flags);
 726			else
 727				ieee80211_mgd_conn_tx_status(sdata,
 728							     hdr->frame_control,
 729							     acked);
 730		}
 731
 732		rcu_read_unlock();
 733	} else if (info->ack_frame_id) {
 734		ieee80211_report_ack_skb(local, info, acked, dropped);
 735	}
 736
 737	if (!dropped && skb->destructor) {
 738		skb->wifi_acked_valid = 1;
 739		skb->wifi_acked = acked;
 740	}
 741
 742	ieee80211_led_tx(local);
 743
 744	if (skb_has_frag_list(skb)) {
 745		kfree_skb_list(skb_shinfo(skb)->frag_list);
 746		skb_shinfo(skb)->frag_list = NULL;
 747	}
 748}
 749
 750/*
 751 * Use a static threshold for now, best value to be determined
 752 * by testing ...
 753 * Should it depend on:
 754 *  - on # of retransmissions
 755 *  - current throughput (higher value for higher tpt)?
 756 */
 757#define STA_LOST_PKT_THRESHOLD	50
 758#define STA_LOST_PKT_TIME	HZ		/* 1 sec since last ACK */
 759#define STA_LOST_TDLS_PKT_THRESHOLD	10
 760#define STA_LOST_TDLS_PKT_TIME		(10*HZ) /* 10secs since last ACK */
 761
 762static void ieee80211_lost_packet(struct sta_info *sta,
 763				  struct ieee80211_tx_info *info)
 764{
 765	unsigned long pkt_time = STA_LOST_PKT_TIME;
 766	unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
 767
 768	/* If driver relies on its own algorithm for station kickout, skip
 769	 * mac80211 packet loss mechanism.
 770	 */
 771	if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 772		return;
 773
 774	/* This packet was aggregated but doesn't carry status info */
 775	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 776	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
 777		return;
 778
 779	sta->status_stats.lost_packets++;
 780	if (sta->sta.tdls) {
 781		pkt_time = STA_LOST_TDLS_PKT_TIME;
 782		pkt_thr = STA_LOST_PKT_THRESHOLD;
 783	}
 784
 785	/*
 786	 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
 787	 * of the last packets were lost, and that no ACK was received in the
 788	 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 789	 * mechanism.
 790	 * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
 791	 */
 792	if (sta->status_stats.lost_packets < pkt_thr ||
 793	    !time_after(jiffies, sta->status_stats.last_pkt_time + pkt_time))
 
 
 
 794		return;
 795
 796	cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 797				    sta->status_stats.lost_packets, GFP_ATOMIC);
 798	sta->status_stats.lost_packets = 0;
 799}
 800
 801static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 802				  struct ieee80211_tx_info *info,
 803				  int *retry_count)
 804{
 
 805	int count = -1;
 806	int i;
 807
 808	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 809		if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 810		    !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 811			/* just the first aggr frame carry status info */
 812			info->status.rates[i].idx = -1;
 813			info->status.rates[i].count = 0;
 814			break;
 815		} else if (info->status.rates[i].idx < 0) {
 816			break;
 817		} else if (i >= hw->max_report_rates) {
 818			/* the HW cannot have attempted that rate */
 819			info->status.rates[i].idx = -1;
 820			info->status.rates[i].count = 0;
 821			break;
 822		}
 823
 824		count += info->status.rates[i].count;
 825	}
 
 826
 827	if (count < 0)
 828		count = 0;
 829
 830	*retry_count = count;
 831	return i - 1;
 832}
 833
 834void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 835			  struct ieee80211_supported_band *sband,
 836			  int retry_count, int shift, bool send_to_cooked,
 837			  struct ieee80211_tx_status *status)
 838{
 839	struct sk_buff *skb2;
 840	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 841	struct ieee80211_sub_if_data *sdata;
 842	struct net_device *prev_dev = NULL;
 843	int rtap_len;
 844
 845	/* send frame to monitor interfaces now */
 846	rtap_len = ieee80211_tx_radiotap_len(info, status);
 847	if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 848		pr_err("ieee80211_tx_status: headroom too small\n");
 849		dev_kfree_skb(skb);
 850		return;
 851	}
 852	ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
 853					 rtap_len, shift, status);
 854
 855	/* XXX: is this sufficient for BPF? */
 856	skb_reset_mac_header(skb);
 857	skb->ip_summed = CHECKSUM_UNNECESSARY;
 858	skb->pkt_type = PACKET_OTHERHOST;
 859	skb->protocol = htons(ETH_P_802_2);
 860	memset(skb->cb, 0, sizeof(skb->cb));
 861
 862	rcu_read_lock();
 863	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 864		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 865			if (!ieee80211_sdata_running(sdata))
 866				continue;
 867
 868			if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 869			    !send_to_cooked)
 870				continue;
 871
 872			if (prev_dev) {
 873				skb2 = skb_clone(skb, GFP_ATOMIC);
 874				if (skb2) {
 875					skb2->dev = prev_dev;
 876					netif_rx(skb2);
 877				}
 878			}
 879
 880			prev_dev = sdata->dev;
 881		}
 882	}
 883	if (prev_dev) {
 884		skb->dev = prev_dev;
 885		netif_rx(skb);
 886		skb = NULL;
 887	}
 888	rcu_read_unlock();
 889	dev_kfree_skb(skb);
 890}
 891
 892static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 893				  struct ieee80211_tx_status *status)
 894{
 895	struct sk_buff *skb = status->skb;
 896	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 897	struct ieee80211_local *local = hw_to_local(hw);
 898	struct ieee80211_tx_info *info = status->info;
 899	struct sta_info *sta;
 900	__le16 fc;
 901	struct ieee80211_supported_band *sband;
 902	int retry_count;
 903	int rates_idx;
 904	bool send_to_cooked;
 905	bool acked;
 906	bool noack_success;
 907	struct ieee80211_bar *bar;
 908	int shift = 0;
 909	int tid = IEEE80211_NUM_TIDS;
 910	u16 tx_time_est;
 911
 912	rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
 913
 914	sband = local->hw.wiphy->bands[info->band];
 915	fc = hdr->frame_control;
 916
 917	if (status->sta) {
 918		sta = container_of(status->sta, struct sta_info, sta);
 919		shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 920
 921		if (info->flags & IEEE80211_TX_STATUS_EOSP)
 922			clear_sta_flag(sta, WLAN_STA_SP);
 923
 924		acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 925		noack_success = !!(info->flags &
 926				   IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 927
 928		/* mesh Peer Service Period support */
 929		if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 930		    ieee80211_is_data_qos(fc))
 931			ieee80211_mpsp_trigger_process(
 932				ieee80211_get_qos_ctl(hdr), sta, true, acked);
 933
 934		if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
 935			/*
 936			 * The STA is in power save mode, so assume
 937			 * that this TX packet failed because of that.
 938			 */
 939			ieee80211_handle_filtered_frame(local, sta, skb);
 940			return;
 941		}
 942
 943		if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 944		    (ieee80211_is_data(hdr->frame_control)) &&
 945		    (rates_idx != -1))
 946			sta->tx_stats.last_rate =
 947				info->status.rates[rates_idx];
 948
 949		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 950		    (ieee80211_is_data_qos(fc))) {
 951			u16 ssn;
 952			u8 *qc;
 953
 954			qc = ieee80211_get_qos_ctl(hdr);
 955			tid = qc[0] & 0xf;
 956			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 957						& IEEE80211_SCTL_SEQ);
 958			ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 959					   tid, ssn);
 960		} else if (ieee80211_is_data_qos(fc)) {
 961			u8 *qc = ieee80211_get_qos_ctl(hdr);
 962
 963			tid = qc[0] & 0xf;
 964		}
 965
 966		if (!acked && ieee80211_is_back_req(fc)) {
 967			u16 control;
 968
 969			/*
 970			 * BAR failed, store the last SSN and retry sending
 971			 * the BAR when the next unicast transmission on the
 972			 * same TID succeeds.
 973			 */
 974			bar = (struct ieee80211_bar *) skb->data;
 975			control = le16_to_cpu(bar->control);
 976			if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 977				u16 ssn = le16_to_cpu(bar->start_seq_num);
 978
 979				tid = (control &
 980				       IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 981				      IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 982
 983				ieee80211_set_bar_pending(sta, tid, ssn);
 984			}
 985		}
 986
 987		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 988			ieee80211_handle_filtered_frame(local, sta, skb);
 989			return;
 990		} else {
 991			if (!acked && !noack_success)
 992				sta->status_stats.retry_failed++;
 993			sta->status_stats.retry_count += retry_count;
 994
 995			if (ieee80211_is_data_present(fc)) {
 996				if (!acked && !noack_success)
 997					sta->status_stats.msdu_failed[tid]++;
 998
 999				sta->status_stats.msdu_retries[tid] +=
1000					retry_count;
1001			}
1002		}
1003
1004		rate_control_tx_status(local, sband, status);
1005		if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1006			ieee80211s_update_metric(local, sta, status);
1007
1008		if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
1009			ieee80211_frame_acked(sta, skb);
1010
1011		if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
1012		    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1013			ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
1014						acked, info->status.tx_time);
1015
1016		if (info->status.tx_time &&
1017		    wiphy_ext_feature_isset(local->hw.wiphy,
1018					    NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
1019			ieee80211_sta_register_airtime(&sta->sta, tid,
1020						       info->status.tx_time, 0);
1021
1022		if ((tx_time_est = ieee80211_info_get_tx_time_est(info)) > 0) {
1023			/* Do this here to avoid the expensive lookup of the sta
1024			 * in ieee80211_report_used_skb().
1025			 */
1026			ieee80211_sta_update_pending_airtime(local, sta,
1027							     skb_get_queue_mapping(skb),
1028							     tx_time_est,
1029							     true);
1030			ieee80211_info_set_tx_time_est(info, 0);
1031		}
1032
1033		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1034			if (acked) {
1035				if (sta->status_stats.lost_packets)
1036					sta->status_stats.lost_packets = 0;
1037
1038				/* Track when last TDLS packet was ACKed */
1039				sta->status_stats.last_pkt_time = jiffies;
1040			} else if (noack_success) {
1041				/* nothing to do here, do not account as lost */
1042			} else {
1043				ieee80211_lost_packet(sta, info);
1044			}
1045		}
1046	}
1047
1048	/* SNMP counters
1049	 * Fragments are passed to low-level drivers as separate skbs, so these
1050	 * are actually fragments, not frames. Update frame counters only for
1051	 * the first fragment of the frame. */
1052	if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1053	    (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1054		if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1055			I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1056			if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1057				I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1058			if (retry_count > 0)
1059				I802_DEBUG_INC(local->dot11RetryCount);
1060			if (retry_count > 1)
1061				I802_DEBUG_INC(local->dot11MultipleRetryCount);
1062		}
1063
1064		/* This counter shall be incremented for an acknowledged MPDU
1065		 * with an individual address in the address 1 field or an MPDU
1066		 * with a multicast address in the address 1 field of type Data
1067		 * or Management. */
1068		if (!is_multicast_ether_addr(hdr->addr1) ||
1069		    ieee80211_is_data(fc) ||
1070		    ieee80211_is_mgmt(fc))
1071			I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1072	} else {
1073		if (ieee80211_is_first_frag(hdr->seq_ctrl))
1074			I802_DEBUG_INC(local->dot11FailedCount);
1075	}
1076
1077	if (ieee80211_is_any_nullfunc(fc) &&
1078	    ieee80211_has_pm(fc) &&
1079	    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1080	    !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1081	    local->ps_sdata && !(local->scanning)) {
1082		if (info->flags & IEEE80211_TX_STAT_ACK) {
1083			local->ps_sdata->u.mgd.flags |=
1084					IEEE80211_STA_NULLFUNC_ACKED;
1085		} else
1086			mod_timer(&local->dynamic_ps_timer, jiffies +
1087					msecs_to_jiffies(10));
1088	}
1089
1090	ieee80211_report_used_skb(local, skb, false);
1091
1092	/* this was a transmitted frame, but now we want to reuse it */
1093	skb_orphan(skb);
1094
1095	/* Need to make a copy before skb->cb gets cleared */
1096	send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1097			 !(ieee80211_is_data(fc));
1098
1099	/*
1100	 * This is a bit racy but we can avoid a lot of work
1101	 * with this test...
1102	 */
1103	if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1104		dev_kfree_skb(skb);
1105		return;
1106	}
1107
1108	/* send to monitor interfaces */
1109	ieee80211_tx_monitor(local, skb, sband, retry_count, shift,
1110			     send_to_cooked, status);
1111}
1112
1113void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1114{
1115	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1116	struct ieee80211_local *local = hw_to_local(hw);
1117	struct ieee80211_tx_status status = {
1118		.skb = skb,
1119		.info = IEEE80211_SKB_CB(skb),
1120	};
 
1121	struct sta_info *sta;
1122
1123	rcu_read_lock();
1124
1125	sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1126	if (sta)
 
 
 
1127		status.sta = &sta->sta;
 
 
1128
1129	__ieee80211_tx_status(hw, &status);
1130	rcu_read_unlock();
1131}
1132EXPORT_SYMBOL(ieee80211_tx_status);
1133
1134void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1135			     struct ieee80211_tx_status *status)
1136{
1137	struct ieee80211_local *local = hw_to_local(hw);
1138	struct ieee80211_tx_info *info = status->info;
1139	struct ieee80211_sta *pubsta = status->sta;
1140	struct ieee80211_supported_band *sband;
1141	struct sta_info *sta;
1142	int retry_count;
1143	bool acked, noack_success;
1144
1145	if (pubsta) {
1146		sta = container_of(pubsta, struct sta_info, sta);
1147
1148		if (status->rate)
1149			sta->tx_stats.last_rate_info = *status->rate;
1150	}
1151
1152	if (status->skb)
1153		return __ieee80211_tx_status(hw, status);
1154
1155	if (!status->sta)
1156		return;
1157
1158	ieee80211_tx_get_rates(hw, info, &retry_count);
1159
1160	sband = hw->wiphy->bands[info->band];
1161
1162	acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1163	noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1164
1165	if (pubsta) {
1166		if (!acked && !noack_success)
 
 
 
 
1167			sta->status_stats.retry_failed++;
1168		sta->status_stats.retry_count += retry_count;
1169
1170		if (acked) {
1171			sta->status_stats.last_ack = jiffies;
1172
1173			if (sta->status_stats.lost_packets)
1174				sta->status_stats.lost_packets = 0;
1175
1176			/* Track when last packet was ACKed */
1177			sta->status_stats.last_pkt_time = jiffies;
 
1178		} else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1179			return;
1180		} else if (noack_success) {
1181			/* nothing to do here, do not account as lost */
1182		} else {
1183			ieee80211_lost_packet(sta, info);
1184		}
1185
1186		rate_control_tx_status(local, sband, status);
1187		if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1188			ieee80211s_update_metric(local, sta, status);
1189	}
1190
1191	if (acked || noack_success) {
1192		I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1193		if (!pubsta)
1194			I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1195		if (retry_count > 0)
1196			I802_DEBUG_INC(local->dot11RetryCount);
1197		if (retry_count > 1)
1198			I802_DEBUG_INC(local->dot11MultipleRetryCount);
1199	} else {
1200		I802_DEBUG_INC(local->dot11FailedCount);
1201	}
1202}
1203EXPORT_SYMBOL(ieee80211_tx_status_ext);
1204
1205void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1206			      struct ieee80211_sta *pubsta,
1207			      struct ieee80211_tx_info *info)
1208{
1209	struct ieee80211_local *local = hw_to_local(hw);
1210	struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band];
1211	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1212	struct ieee80211_tx_status status = {
1213		.info = info,
1214		.sta = pubsta,
1215	};
1216
1217	rate_control_tx_status(local, sband, &status);
1218
1219	if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1220		sta->tx_stats.last_rate = info->status.rates[0];
1221}
1222EXPORT_SYMBOL(ieee80211_tx_rate_update);
1223
1224void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
1225			      struct ieee80211_vif *vif,
1226			      struct sk_buff *skb)
1227{
1228	struct ieee80211_local *local = hw_to_local(hw);
1229	struct ieee80211_sub_if_data *sdata;
1230	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1231	struct sta_info *sta;
1232	int retry_count;
1233	int rates_idx;
1234	bool acked;
1235
1236	sdata = vif_to_sdata(vif);
1237
1238	acked = info->flags & IEEE80211_TX_STAT_ACK;
1239	rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1240
1241	rcu_read_lock();
1242
1243	if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
1244		goto counters_update;
1245
1246	if (IS_ERR(sta))
1247		goto counters_update;
1248
1249	if (!acked)
1250		sta->status_stats.retry_failed++;
1251
1252	if (rates_idx != -1)
1253		sta->tx_stats.last_rate = info->status.rates[rates_idx];
1254
1255	sta->status_stats.retry_count += retry_count;
1256
1257	if (ieee80211_hw_check(hw, REPORTS_TX_ACK_STATUS)) {
1258		if (acked && vif->type == NL80211_IFTYPE_STATION)
1259			ieee80211_sta_reset_conn_monitor(sdata);
1260
1261		sta->status_stats.last_ack = jiffies;
1262		if (info->flags & IEEE80211_TX_STAT_ACK) {
1263			if (sta->status_stats.lost_packets)
1264				sta->status_stats.lost_packets = 0;
1265
1266			sta->status_stats.last_pkt_time = jiffies;
1267		} else {
1268			ieee80211_lost_packet(sta, info);
1269		}
1270	}
1271
1272counters_update:
1273	rcu_read_unlock();
1274	ieee80211_led_tx(local);
1275
1276	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1277	    !(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED))
1278		goto skip_stats_update;
1279
1280	I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1281	if (is_multicast_ether_addr(skb->data))
1282		I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1283	if (retry_count > 0)
1284		I802_DEBUG_INC(local->dot11RetryCount);
1285	if (retry_count > 1)
1286		I802_DEBUG_INC(local->dot11MultipleRetryCount);
1287
1288skip_stats_update:
1289	ieee80211_report_used_skb(local, skb, false);
1290	dev_kfree_skb(skb);
1291}
1292EXPORT_SYMBOL(ieee80211_tx_status_8023);
1293
1294void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1295{
1296	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1297	cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1298				    num_packets, GFP_ATOMIC);
1299}
1300EXPORT_SYMBOL(ieee80211_report_low_ack);
1301
1302void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1303{
1304	struct ieee80211_local *local = hw_to_local(hw);
1305
1306	ieee80211_report_used_skb(local, skb, true);
1307	dev_kfree_skb_any(skb);
1308}
1309EXPORT_SYMBOL(ieee80211_free_txskb);
1310
1311void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1312			      struct sk_buff_head *skbs)
1313{
1314	struct sk_buff *skb;
1315
1316	while ((skb = __skb_dequeue(skbs)))
1317		ieee80211_free_txskb(hw, skb);
1318}