1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net> 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 <linux/export.h> 13 #include <linux/etherdevice.h> 14 #include <net/mac80211.h> 15 #include <asm/unaligned.h> 16 #include "ieee80211_i.h" 17 #include "rate.h" 18 #include "mesh.h" 19 #include "led.h" 20 #include "wme.h" 21 22 23 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 24 struct sk_buff *skb) 25 { 26 struct ieee80211_local *local = hw_to_local(hw); 27 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 28 int tmp; 29 30 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 31 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 32 &local->skb_queue : &local->skb_queue_unreliable, skb); 33 tmp = skb_queue_len(&local->skb_queue) + 34 skb_queue_len(&local->skb_queue_unreliable); 35 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 36 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 37 ieee80211_free_txskb(hw, skb); 38 tmp--; 39 I802_DEBUG_INC(local->tx_status_drop); 40 } 41 tasklet_schedule(&local->tasklet); 42 } 43 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 44 45 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 46 struct sta_info *sta, 47 struct sk_buff *skb) 48 { 49 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 50 struct ieee80211_hdr *hdr = (void *)skb->data; 51 int ac; 52 53 /* 54 * This skb 'survived' a round-trip through the driver, and 55 * hopefully the driver didn't mangle it too badly. However, 56 * we can definitely not rely on the control information 57 * being correct. Clear it so we don't get junk there, and 58 * indicate that it needs new processing, but must not be 59 * modified/encrypted again. 60 */ 61 memset(&info->control, 0, sizeof(info->control)); 62 63 info->control.jiffies = jiffies; 64 info->control.vif = &sta->sdata->vif; 65 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 66 IEEE80211_TX_INTFL_RETRANSMISSION; 67 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 68 69 sta->tx_filtered_count++; 70 71 /* 72 * Clear more-data bit on filtered frames, it might be set 73 * but later frames might time out so it might have to be 74 * clear again ... It's all rather unlikely (this frame 75 * should time out first, right?) but let's not confuse 76 * peers unnecessarily. 77 */ 78 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) 79 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); 80 81 if (ieee80211_is_data_qos(hdr->frame_control)) { 82 u8 *p = ieee80211_get_qos_ctl(hdr); 83 int tid = *p & IEEE80211_QOS_CTL_TID_MASK; 84 85 /* 86 * Clear EOSP if set, this could happen e.g. 87 * if an absence period (us being a P2P GO) 88 * shortens the SP. 89 */ 90 if (*p & IEEE80211_QOS_CTL_EOSP) 91 *p &= ~IEEE80211_QOS_CTL_EOSP; 92 ac = ieee802_1d_to_ac[tid & 7]; 93 } else { 94 ac = IEEE80211_AC_BE; 95 } 96 97 /* 98 * Clear the TX filter mask for this STA when sending the next 99 * packet. If the STA went to power save mode, this will happen 100 * when it wakes up for the next time. 101 */ 102 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); 103 104 /* 105 * This code races in the following way: 106 * 107 * (1) STA sends frame indicating it will go to sleep and does so 108 * (2) hardware/firmware adds STA to filter list, passes frame up 109 * (3) hardware/firmware processes TX fifo and suppresses a frame 110 * (4) we get TX status before having processed the frame and 111 * knowing that the STA has gone to sleep. 112 * 113 * This is actually quite unlikely even when both those events are 114 * processed from interrupts coming in quickly after one another or 115 * even at the same time because we queue both TX status events and 116 * RX frames to be processed by a tasklet and process them in the 117 * same order that they were received or TX status last. Hence, there 118 * is no race as long as the frame RX is processed before the next TX 119 * status, which drivers can ensure, see below. 120 * 121 * Note that this can only happen if the hardware or firmware can 122 * actually add STAs to the filter list, if this is done by the 123 * driver in response to set_tim() (which will only reduce the race 124 * this whole filtering tries to solve, not completely solve it) 125 * this situation cannot happen. 126 * 127 * To completely solve this race drivers need to make sure that they 128 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 129 * functions and 130 * (b) always process RX events before TX status events if ordering 131 * can be unknown, for example with different interrupt status 132 * bits. 133 * (c) if PS mode transitions are manual (i.e. the flag 134 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state 135 * changes before calling TX status events if ordering can be 136 * unknown. 137 */ 138 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 139 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { 140 skb_queue_tail(&sta->tx_filtered[ac], skb); 141 sta_info_recalc_tim(sta); 142 143 if (!timer_pending(&local->sta_cleanup)) 144 mod_timer(&local->sta_cleanup, 145 round_jiffies(jiffies + 146 STA_INFO_CLEANUP_INTERVAL)); 147 return; 148 } 149 150 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 151 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 152 /* Software retry the packet once */ 153 info->flags |= IEEE80211_TX_INTFL_RETRIED; 154 ieee80211_add_pending_skb(local, skb); 155 return; 156 } 157 158 ps_dbg_ratelimited(sta->sdata, 159 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", 160 skb_queue_len(&sta->tx_filtered[ac]), 161 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); 162 ieee80211_free_txskb(&local->hw, skb); 163 } 164 165 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 166 { 167 struct tid_ampdu_tx *tid_tx; 168 169 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 170 if (!tid_tx || !tid_tx->bar_pending) 171 return; 172 173 tid_tx->bar_pending = false; 174 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 175 } 176 177 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 178 { 179 struct ieee80211_mgmt *mgmt = (void *) skb->data; 180 struct ieee80211_local *local = sta->local; 181 struct ieee80211_sub_if_data *sdata = sta->sdata; 182 183 if (ieee80211_is_data_qos(mgmt->frame_control)) { 184 struct ieee80211_hdr *hdr = (void *) skb->data; 185 u8 *qc = ieee80211_get_qos_ctl(hdr); 186 u16 tid = qc[0] & 0xf; 187 188 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 189 } 190 191 if (ieee80211_is_action(mgmt->frame_control) && 192 mgmt->u.action.category == WLAN_CATEGORY_HT && 193 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && 194 sdata->vif.type == NL80211_IFTYPE_STATION && 195 ieee80211_sdata_running(sdata)) { 196 /* 197 * This update looks racy, but isn't -- if we come 198 * here we've definitely got a station that we're 199 * talking to, and on a managed interface that can 200 * only be the AP. And the only other place updating 201 * this variable in managed mode is before association. 202 */ 203 switch (mgmt->u.action.u.ht_smps.smps_control) { 204 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 205 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 206 break; 207 case WLAN_HT_SMPS_CONTROL_STATIC: 208 sdata->smps_mode = IEEE80211_SMPS_STATIC; 209 break; 210 case WLAN_HT_SMPS_CONTROL_DISABLED: 211 default: /* shouldn't happen since we don't send that */ 212 sdata->smps_mode = IEEE80211_SMPS_OFF; 213 break; 214 } 215 216 ieee80211_queue_work(&local->hw, &sdata->recalc_smps); 217 } 218 } 219 220 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 221 { 222 struct tid_ampdu_tx *tid_tx; 223 224 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 225 if (!tid_tx) 226 return; 227 228 tid_tx->failed_bar_ssn = ssn; 229 tid_tx->bar_pending = true; 230 } 231 232 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 233 { 234 int len = sizeof(struct ieee80211_radiotap_header); 235 236 /* IEEE80211_RADIOTAP_RATE rate */ 237 if (info->status.rates[0].idx >= 0 && 238 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 239 IEEE80211_TX_RC_VHT_MCS))) 240 len += 2; 241 242 /* IEEE80211_RADIOTAP_TX_FLAGS */ 243 len += 2; 244 245 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 246 len += 1; 247 248 /* IEEE80211_RADIOTAP_MCS 249 * IEEE80211_RADIOTAP_VHT */ 250 if (info->status.rates[0].idx >= 0) { 251 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 252 len += 3; 253 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) 254 len = ALIGN(len, 2) + 12; 255 } 256 257 return len; 258 } 259 260 static void 261 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local, 262 struct ieee80211_supported_band *sband, 263 struct sk_buff *skb, int retry_count, 264 int rtap_len, int shift) 265 { 266 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 267 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 268 struct ieee80211_radiotap_header *rthdr; 269 unsigned char *pos; 270 u16 txflags; 271 272 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 273 274 memset(rthdr, 0, rtap_len); 275 rthdr->it_len = cpu_to_le16(rtap_len); 276 rthdr->it_present = 277 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 278 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 279 pos = (unsigned char *)(rthdr + 1); 280 281 /* 282 * XXX: Once radiotap gets the bitmap reset thing the vendor 283 * extensions proposal contains, we can actually report 284 * the whole set of tries we did. 285 */ 286 287 /* IEEE80211_RADIOTAP_RATE */ 288 if (info->status.rates[0].idx >= 0 && 289 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 290 IEEE80211_TX_RC_VHT_MCS))) { 291 u16 rate; 292 293 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 294 rate = sband->bitrates[info->status.rates[0].idx].bitrate; 295 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift)); 296 /* padding for tx flags */ 297 pos += 2; 298 } 299 300 /* IEEE80211_RADIOTAP_TX_FLAGS */ 301 txflags = 0; 302 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 303 !is_multicast_ether_addr(hdr->addr1)) 304 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 305 306 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 307 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 308 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 309 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 310 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 311 312 put_unaligned_le16(txflags, pos); 313 pos += 2; 314 315 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 316 /* for now report the total retry_count */ 317 *pos = retry_count; 318 pos++; 319 320 if (info->status.rates[0].idx < 0) 321 return; 322 323 /* IEEE80211_RADIOTAP_MCS 324 * IEEE80211_RADIOTAP_VHT */ 325 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 326 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 327 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 328 IEEE80211_RADIOTAP_MCS_HAVE_GI | 329 IEEE80211_RADIOTAP_MCS_HAVE_BW; 330 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 331 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 332 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 333 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 334 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 335 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 336 pos[2] = info->status.rates[0].idx; 337 pos += 3; 338 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) { 339 u16 known = local->hw.radiotap_vht_details & 340 (IEEE80211_RADIOTAP_VHT_KNOWN_GI | 341 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH); 342 343 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 344 345 /* required alignment from rthdr */ 346 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2); 347 348 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */ 349 put_unaligned_le16(known, pos); 350 pos += 2; 351 352 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */ 353 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 354 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 355 pos++; 356 357 /* u8 bandwidth */ 358 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 359 *pos = 1; 360 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH) 361 *pos = 4; 362 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH) 363 *pos = 11; 364 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */ 365 *pos = 0; 366 pos++; 367 368 /* u8 mcs_nss[4] */ 369 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) | 370 ieee80211_rate_get_vht_nss(&info->status.rates[0]); 371 pos += 4; 372 373 /* u8 coding */ 374 pos++; 375 /* u8 group_id */ 376 pos++; 377 /* u16 partial_aid */ 378 pos += 2; 379 } 380 } 381 382 static void ieee80211_report_used_skb(struct ieee80211_local *local, 383 struct sk_buff *skb, bool dropped) 384 { 385 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 386 struct ieee80211_hdr *hdr = (void *)skb->data; 387 bool acked = info->flags & IEEE80211_TX_STAT_ACK; 388 389 if (dropped) 390 acked = false; 391 392 if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 393 IEEE80211_TX_INTFL_MLME_CONN_TX)) { 394 struct ieee80211_sub_if_data *sdata = NULL; 395 struct ieee80211_sub_if_data *iter_sdata; 396 u64 cookie = (unsigned long)skb; 397 398 rcu_read_lock(); 399 400 if (skb->dev) { 401 list_for_each_entry_rcu(iter_sdata, &local->interfaces, 402 list) { 403 if (!iter_sdata->dev) 404 continue; 405 406 if (skb->dev == iter_sdata->dev) { 407 sdata = iter_sdata; 408 break; 409 } 410 } 411 } else { 412 sdata = rcu_dereference(local->p2p_sdata); 413 } 414 415 if (!sdata) { 416 skb->dev = NULL; 417 } else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { 418 ieee80211_mgd_conn_tx_status(sdata, hdr->frame_control, 419 acked); 420 } else if (ieee80211_is_nullfunc(hdr->frame_control) || 421 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 422 cfg80211_probe_status(sdata->dev, hdr->addr1, 423 cookie, acked, GFP_ATOMIC); 424 } else { 425 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data, 426 skb->len, acked, GFP_ATOMIC); 427 } 428 429 rcu_read_unlock(); 430 } 431 432 if (unlikely(info->ack_frame_id)) { 433 struct sk_buff *ack_skb; 434 unsigned long flags; 435 436 spin_lock_irqsave(&local->ack_status_lock, flags); 437 ack_skb = idr_find(&local->ack_status_frames, 438 info->ack_frame_id); 439 if (ack_skb) 440 idr_remove(&local->ack_status_frames, 441 info->ack_frame_id); 442 spin_unlock_irqrestore(&local->ack_status_lock, flags); 443 444 if (ack_skb) { 445 if (!dropped) { 446 /* consumes ack_skb */ 447 skb_complete_wifi_ack(ack_skb, acked); 448 } else { 449 dev_kfree_skb_any(ack_skb); 450 } 451 } 452 } 453 } 454 455 /* 456 * Use a static threshold for now, best value to be determined 457 * by testing ... 458 * Should it depend on: 459 * - on # of retransmissions 460 * - current throughput (higher value for higher tpt)? 461 */ 462 #define STA_LOST_PKT_THRESHOLD 50 463 464 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 465 { 466 struct sk_buff *skb2; 467 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 468 struct ieee80211_local *local = hw_to_local(hw); 469 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 470 __le16 fc; 471 struct ieee80211_supported_band *sband; 472 struct ieee80211_sub_if_data *sdata; 473 struct net_device *prev_dev = NULL; 474 struct sta_info *sta, *tmp; 475 int retry_count = -1, i; 476 int rates_idx = -1; 477 bool send_to_cooked; 478 bool acked; 479 struct ieee80211_bar *bar; 480 int rtap_len; 481 int shift = 0; 482 483 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 484 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 485 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 486 /* just the first aggr frame carry status info */ 487 info->status.rates[i].idx = -1; 488 info->status.rates[i].count = 0; 489 break; 490 } else if (info->status.rates[i].idx < 0) { 491 break; 492 } else if (i >= hw->max_report_rates) { 493 /* the HW cannot have attempted that rate */ 494 info->status.rates[i].idx = -1; 495 info->status.rates[i].count = 0; 496 break; 497 } 498 499 retry_count += info->status.rates[i].count; 500 } 501 rates_idx = i - 1; 502 503 if (retry_count < 0) 504 retry_count = 0; 505 506 rcu_read_lock(); 507 508 sband = local->hw.wiphy->bands[info->band]; 509 fc = hdr->frame_control; 510 511 for_each_sta_info(local, hdr->addr1, sta, tmp) { 512 /* skip wrong virtual interface */ 513 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 514 continue; 515 516 shift = ieee80211_vif_get_shift(&sta->sdata->vif); 517 518 if (info->flags & IEEE80211_TX_STATUS_EOSP) 519 clear_sta_flag(sta, WLAN_STA_SP); 520 521 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 522 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 523 /* 524 * The STA is in power save mode, so assume 525 * that this TX packet failed because of that. 526 */ 527 ieee80211_handle_filtered_frame(local, sta, skb); 528 rcu_read_unlock(); 529 return; 530 } 531 532 /* mesh Peer Service Period support */ 533 if (ieee80211_vif_is_mesh(&sta->sdata->vif) && 534 ieee80211_is_data_qos(fc)) 535 ieee80211_mpsp_trigger_process( 536 ieee80211_get_qos_ctl(hdr), 537 sta, true, acked); 538 539 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && 540 (rates_idx != -1)) 541 sta->last_tx_rate = info->status.rates[rates_idx]; 542 543 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 544 (ieee80211_is_data_qos(fc))) { 545 u16 tid, ssn; 546 u8 *qc; 547 548 qc = ieee80211_get_qos_ctl(hdr); 549 tid = qc[0] & 0xf; 550 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 551 & IEEE80211_SCTL_SEQ); 552 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 553 tid, ssn); 554 } 555 556 if (!acked && ieee80211_is_back_req(fc)) { 557 u16 tid, control; 558 559 /* 560 * BAR failed, store the last SSN and retry sending 561 * the BAR when the next unicast transmission on the 562 * same TID succeeds. 563 */ 564 bar = (struct ieee80211_bar *) skb->data; 565 control = le16_to_cpu(bar->control); 566 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 567 u16 ssn = le16_to_cpu(bar->start_seq_num); 568 569 tid = (control & 570 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 571 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 572 573 ieee80211_set_bar_pending(sta, tid, ssn); 574 } 575 } 576 577 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 578 ieee80211_handle_filtered_frame(local, sta, skb); 579 rcu_read_unlock(); 580 return; 581 } else { 582 if (!acked) 583 sta->tx_retry_failed++; 584 sta->tx_retry_count += retry_count; 585 } 586 587 rate_control_tx_status(local, sband, sta, skb); 588 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 589 ieee80211s_update_metric(local, sta, skb); 590 591 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 592 ieee80211_frame_acked(sta, skb); 593 594 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 595 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 596 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked); 597 598 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 599 if (info->flags & IEEE80211_TX_STAT_ACK) { 600 if (sta->lost_packets) 601 sta->lost_packets = 0; 602 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) { 603 cfg80211_cqm_pktloss_notify(sta->sdata->dev, 604 sta->sta.addr, 605 sta->lost_packets, 606 GFP_ATOMIC); 607 sta->lost_packets = 0; 608 } 609 } 610 611 if (acked) 612 sta->last_ack_signal = info->status.ack_signal; 613 } 614 615 rcu_read_unlock(); 616 617 ieee80211_led_tx(local); 618 619 /* SNMP counters 620 * Fragments are passed to low-level drivers as separate skbs, so these 621 * are actually fragments, not frames. Update frame counters only for 622 * the first fragment of the frame. */ 623 if (info->flags & IEEE80211_TX_STAT_ACK) { 624 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 625 local->dot11TransmittedFrameCount++; 626 if (is_multicast_ether_addr(hdr->addr1)) 627 local->dot11MulticastTransmittedFrameCount++; 628 if (retry_count > 0) 629 local->dot11RetryCount++; 630 if (retry_count > 1) 631 local->dot11MultipleRetryCount++; 632 } 633 634 /* This counter shall be incremented for an acknowledged MPDU 635 * with an individual address in the address 1 field or an MPDU 636 * with a multicast address in the address 1 field of type Data 637 * or Management. */ 638 if (!is_multicast_ether_addr(hdr->addr1) || 639 ieee80211_is_data(fc) || 640 ieee80211_is_mgmt(fc)) 641 local->dot11TransmittedFragmentCount++; 642 } else { 643 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 644 local->dot11FailedCount++; 645 } 646 647 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 648 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 649 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 650 local->ps_sdata && !(local->scanning)) { 651 if (info->flags & IEEE80211_TX_STAT_ACK) { 652 local->ps_sdata->u.mgd.flags |= 653 IEEE80211_STA_NULLFUNC_ACKED; 654 } else 655 mod_timer(&local->dynamic_ps_timer, jiffies + 656 msecs_to_jiffies(10)); 657 } 658 659 ieee80211_report_used_skb(local, skb, false); 660 661 /* this was a transmitted frame, but now we want to reuse it */ 662 skb_orphan(skb); 663 664 /* Need to make a copy before skb->cb gets cleared */ 665 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 666 !(ieee80211_is_data(fc)); 667 668 /* 669 * This is a bit racy but we can avoid a lot of work 670 * with this test... 671 */ 672 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 673 dev_kfree_skb(skb); 674 return; 675 } 676 677 /* send frame to monitor interfaces now */ 678 rtap_len = ieee80211_tx_radiotap_len(info); 679 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 680 pr_err("ieee80211_tx_status: headroom too small\n"); 681 dev_kfree_skb(skb); 682 return; 683 } 684 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count, 685 rtap_len, shift); 686 687 /* XXX: is this sufficient for BPF? */ 688 skb_set_mac_header(skb, 0); 689 skb->ip_summed = CHECKSUM_UNNECESSARY; 690 skb->pkt_type = PACKET_OTHERHOST; 691 skb->protocol = htons(ETH_P_802_2); 692 memset(skb->cb, 0, sizeof(skb->cb)); 693 694 rcu_read_lock(); 695 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 696 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 697 if (!ieee80211_sdata_running(sdata)) 698 continue; 699 700 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && 701 !send_to_cooked) 702 continue; 703 704 if (prev_dev) { 705 skb2 = skb_clone(skb, GFP_ATOMIC); 706 if (skb2) { 707 skb2->dev = prev_dev; 708 netif_rx(skb2); 709 } 710 } 711 712 prev_dev = sdata->dev; 713 } 714 } 715 if (prev_dev) { 716 skb->dev = prev_dev; 717 netif_rx(skb); 718 skb = NULL; 719 } 720 rcu_read_unlock(); 721 dev_kfree_skb(skb); 722 } 723 EXPORT_SYMBOL(ieee80211_tx_status); 724 725 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 726 { 727 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 728 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 729 num_packets, GFP_ATOMIC); 730 } 731 EXPORT_SYMBOL(ieee80211_report_low_ack); 732 733 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 734 { 735 struct ieee80211_local *local = hw_to_local(hw); 736 737 ieee80211_report_used_skb(local, skb, true); 738 dev_kfree_skb_any(skb); 739 } 740 EXPORT_SYMBOL(ieee80211_free_txskb); 741 742 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 743 struct sk_buff_head *skbs) 744 { 745 struct sk_buff *skb; 746 747 while ((skb = __skb_dequeue(skbs))) 748 ieee80211_free_txskb(hw, skb); 749 } 750