1 // SPDX-License-Identifier: ISC 2 /* 3 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name> 4 */ 5 6 #include "mt76.h" 7 8 static int 9 mt76_txq_get_qid(struct ieee80211_txq *txq) 10 { 11 if (!txq->sta) 12 return MT_TXQ_BE; 13 14 return txq->ac; 15 } 16 17 void 18 mt76_tx_check_agg_ssn(struct ieee80211_sta *sta, struct sk_buff *skb) 19 { 20 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 21 struct ieee80211_txq *txq; 22 struct mt76_txq *mtxq; 23 u8 tid; 24 25 if (!sta || !ieee80211_is_data_qos(hdr->frame_control) || 26 !ieee80211_is_data_present(hdr->frame_control)) 27 return; 28 29 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 30 txq = sta->txq[tid]; 31 mtxq = (struct mt76_txq *)txq->drv_priv; 32 if (!mtxq->aggr) 33 return; 34 35 mtxq->agg_ssn = le16_to_cpu(hdr->seq_ctrl) + 0x10; 36 } 37 EXPORT_SYMBOL_GPL(mt76_tx_check_agg_ssn); 38 39 void 40 mt76_tx_status_lock(struct mt76_dev *dev, struct sk_buff_head *list) 41 __acquires(&dev->status_list.lock) 42 { 43 __skb_queue_head_init(list); 44 spin_lock_bh(&dev->status_list.lock); 45 } 46 EXPORT_SYMBOL_GPL(mt76_tx_status_lock); 47 48 void 49 mt76_tx_status_unlock(struct mt76_dev *dev, struct sk_buff_head *list) 50 __releases(&dev->status_list.lock) 51 { 52 struct ieee80211_hw *hw; 53 struct sk_buff *skb; 54 55 spin_unlock_bh(&dev->status_list.lock); 56 57 while ((skb = __skb_dequeue(list)) != NULL) { 58 hw = mt76_tx_status_get_hw(dev, skb); 59 ieee80211_tx_status(hw, skb); 60 } 61 62 } 63 EXPORT_SYMBOL_GPL(mt76_tx_status_unlock); 64 65 static void 66 __mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb, u8 flags, 67 struct sk_buff_head *list) 68 { 69 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 70 struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb); 71 u8 done = MT_TX_CB_DMA_DONE | MT_TX_CB_TXS_DONE; 72 73 flags |= cb->flags; 74 cb->flags = flags; 75 76 if ((flags & done) != done) 77 return; 78 79 __skb_unlink(skb, &dev->status_list); 80 81 /* Tx status can be unreliable. if it fails, mark the frame as ACKed */ 82 if (flags & MT_TX_CB_TXS_FAILED) { 83 ieee80211_tx_info_clear_status(info); 84 info->status.rates[0].idx = -1; 85 info->flags |= IEEE80211_TX_STAT_ACK; 86 } 87 88 __skb_queue_tail(list, skb); 89 } 90 91 void 92 mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb, 93 struct sk_buff_head *list) 94 { 95 __mt76_tx_status_skb_done(dev, skb, MT_TX_CB_TXS_DONE, list); 96 } 97 EXPORT_SYMBOL_GPL(mt76_tx_status_skb_done); 98 99 int 100 mt76_tx_status_skb_add(struct mt76_dev *dev, struct mt76_wcid *wcid, 101 struct sk_buff *skb) 102 { 103 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 104 struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb); 105 int pid; 106 107 if (!wcid) 108 return MT_PACKET_ID_NO_ACK; 109 110 if (info->flags & IEEE80211_TX_CTL_NO_ACK) 111 return MT_PACKET_ID_NO_ACK; 112 113 if (!(info->flags & (IEEE80211_TX_CTL_REQ_TX_STATUS | 114 IEEE80211_TX_CTL_RATE_CTRL_PROBE))) 115 return MT_PACKET_ID_NO_SKB; 116 117 spin_lock_bh(&dev->status_list.lock); 118 119 memset(cb, 0, sizeof(*cb)); 120 wcid->packet_id = (wcid->packet_id + 1) & MT_PACKET_ID_MASK; 121 if (wcid->packet_id == MT_PACKET_ID_NO_ACK || 122 wcid->packet_id == MT_PACKET_ID_NO_SKB) 123 wcid->packet_id = MT_PACKET_ID_FIRST; 124 125 pid = wcid->packet_id; 126 cb->wcid = wcid->idx; 127 cb->pktid = pid; 128 cb->jiffies = jiffies; 129 130 __skb_queue_tail(&dev->status_list, skb); 131 spin_unlock_bh(&dev->status_list.lock); 132 133 return pid; 134 } 135 EXPORT_SYMBOL_GPL(mt76_tx_status_skb_add); 136 137 struct sk_buff * 138 mt76_tx_status_skb_get(struct mt76_dev *dev, struct mt76_wcid *wcid, int pktid, 139 struct sk_buff_head *list) 140 { 141 struct sk_buff *skb, *tmp; 142 143 skb_queue_walk_safe(&dev->status_list, skb, tmp) { 144 struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb); 145 146 if (wcid && cb->wcid != wcid->idx) 147 continue; 148 149 if (cb->pktid == pktid) 150 return skb; 151 152 if (pktid >= 0 && !time_after(jiffies, cb->jiffies + 153 MT_TX_STATUS_SKB_TIMEOUT)) 154 continue; 155 156 __mt76_tx_status_skb_done(dev, skb, MT_TX_CB_TXS_FAILED | 157 MT_TX_CB_TXS_DONE, list); 158 } 159 160 return NULL; 161 } 162 EXPORT_SYMBOL_GPL(mt76_tx_status_skb_get); 163 164 void 165 mt76_tx_status_check(struct mt76_dev *dev, struct mt76_wcid *wcid, bool flush) 166 { 167 struct sk_buff_head list; 168 169 mt76_tx_status_lock(dev, &list); 170 mt76_tx_status_skb_get(dev, wcid, flush ? -1 : 0, &list); 171 mt76_tx_status_unlock(dev, &list); 172 } 173 EXPORT_SYMBOL_GPL(mt76_tx_status_check); 174 175 static void 176 mt76_tx_check_non_aql(struct mt76_dev *dev, u16 wcid_idx, struct sk_buff *skb) 177 { 178 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 179 struct mt76_wcid *wcid; 180 int pending; 181 182 if (info->tx_time_est) 183 return; 184 185 if (wcid_idx >= ARRAY_SIZE(dev->wcid)) 186 return; 187 188 rcu_read_lock(); 189 190 wcid = rcu_dereference(dev->wcid[wcid_idx]); 191 if (wcid) { 192 pending = atomic_dec_return(&wcid->non_aql_packets); 193 if (pending < 0) 194 atomic_cmpxchg(&wcid->non_aql_packets, pending, 0); 195 } 196 197 rcu_read_unlock(); 198 } 199 200 void mt76_tx_complete_skb(struct mt76_dev *dev, u16 wcid_idx, struct sk_buff *skb) 201 { 202 struct ieee80211_hw *hw; 203 struct sk_buff_head list; 204 205 #ifdef CONFIG_NL80211_TESTMODE 206 if (skb == dev->test.tx_skb) { 207 dev->test.tx_done++; 208 if (dev->test.tx_queued == dev->test.tx_done) 209 wake_up(&dev->tx_wait); 210 } 211 #endif 212 213 mt76_tx_check_non_aql(dev, wcid_idx, skb); 214 215 if (!skb->prev) { 216 hw = mt76_tx_status_get_hw(dev, skb); 217 ieee80211_free_txskb(hw, skb); 218 return; 219 } 220 221 mt76_tx_status_lock(dev, &list); 222 __mt76_tx_status_skb_done(dev, skb, MT_TX_CB_DMA_DONE, &list); 223 mt76_tx_status_unlock(dev, &list); 224 } 225 EXPORT_SYMBOL_GPL(mt76_tx_complete_skb); 226 227 static int 228 __mt76_tx_queue_skb(struct mt76_dev *dev, int qid, struct sk_buff *skb, 229 struct mt76_wcid *wcid, struct ieee80211_sta *sta, 230 bool *stop) 231 { 232 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 233 struct mt76_queue *q; 234 bool non_aql; 235 int pending; 236 int idx; 237 238 non_aql = !info->tx_time_est; 239 idx = dev->queue_ops->tx_queue_skb(dev, qid, skb, wcid, sta); 240 if (idx < 0 || !sta || !non_aql) 241 return idx; 242 243 wcid = (struct mt76_wcid *)sta->drv_priv; 244 q = dev->q_tx[qid]; 245 q->entry[idx].wcid = wcid->idx; 246 pending = atomic_inc_return(&wcid->non_aql_packets); 247 if (stop && pending >= MT_MAX_NON_AQL_PKT) 248 *stop = true; 249 250 return idx; 251 } 252 253 void 254 mt76_tx(struct mt76_phy *phy, struct ieee80211_sta *sta, 255 struct mt76_wcid *wcid, struct sk_buff *skb) 256 { 257 struct mt76_dev *dev = phy->dev; 258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 259 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 260 struct mt76_queue *q; 261 int qid = skb_get_queue_mapping(skb); 262 bool ext_phy = phy != &dev->phy; 263 264 if (mt76_testmode_enabled(dev)) { 265 ieee80211_free_txskb(phy->hw, skb); 266 return; 267 } 268 269 if (WARN_ON(qid >= MT_TXQ_PSD)) { 270 qid = MT_TXQ_BE; 271 skb_set_queue_mapping(skb, qid); 272 } 273 274 if ((dev->drv->drv_flags & MT_DRV_HW_MGMT_TXQ) && 275 !ieee80211_is_data(hdr->frame_control) && 276 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 277 qid = MT_TXQ_PSD; 278 skb_set_queue_mapping(skb, qid); 279 } 280 281 if (!(wcid->tx_info & MT_WCID_TX_INFO_SET)) 282 ieee80211_get_tx_rates(info->control.vif, sta, skb, 283 info->control.rates, 1); 284 285 if (ext_phy) 286 info->hw_queue |= MT_TX_HW_QUEUE_EXT_PHY; 287 288 q = dev->q_tx[qid]; 289 290 spin_lock_bh(&q->lock); 291 __mt76_tx_queue_skb(dev, qid, skb, wcid, sta, NULL); 292 dev->queue_ops->kick(dev, q); 293 294 if (q->queued > q->ndesc - 8 && !q->stopped) { 295 ieee80211_stop_queue(phy->hw, skb_get_queue_mapping(skb)); 296 q->stopped = true; 297 } 298 299 spin_unlock_bh(&q->lock); 300 } 301 EXPORT_SYMBOL_GPL(mt76_tx); 302 303 static struct sk_buff * 304 mt76_txq_dequeue(struct mt76_phy *phy, struct mt76_txq *mtxq) 305 { 306 struct ieee80211_txq *txq = mtxq_to_txq(mtxq); 307 struct ieee80211_tx_info *info; 308 bool ext_phy = phy != &phy->dev->phy; 309 struct sk_buff *skb; 310 311 skb = ieee80211_tx_dequeue(phy->hw, txq); 312 if (!skb) 313 return NULL; 314 315 info = IEEE80211_SKB_CB(skb); 316 if (ext_phy) 317 info->hw_queue |= MT_TX_HW_QUEUE_EXT_PHY; 318 319 return skb; 320 } 321 322 static void 323 mt76_queue_ps_skb(struct mt76_dev *dev, struct ieee80211_sta *sta, 324 struct sk_buff *skb, bool last) 325 { 326 struct mt76_wcid *wcid = (struct mt76_wcid *)sta->drv_priv; 327 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 328 329 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE; 330 if (last) 331 info->flags |= IEEE80211_TX_STATUS_EOSP | 332 IEEE80211_TX_CTL_REQ_TX_STATUS; 333 334 mt76_skb_set_moredata(skb, !last); 335 __mt76_tx_queue_skb(dev, MT_TXQ_PSD, skb, wcid, sta, NULL); 336 } 337 338 void 339 mt76_release_buffered_frames(struct ieee80211_hw *hw, struct ieee80211_sta *sta, 340 u16 tids, int nframes, 341 enum ieee80211_frame_release_type reason, 342 bool more_data) 343 { 344 struct mt76_phy *phy = hw->priv; 345 struct mt76_dev *dev = phy->dev; 346 struct sk_buff *last_skb = NULL; 347 struct mt76_queue *hwq = dev->q_tx[MT_TXQ_PSD]; 348 int i; 349 350 spin_lock_bh(&hwq->lock); 351 for (i = 0; tids && nframes; i++, tids >>= 1) { 352 struct ieee80211_txq *txq = sta->txq[i]; 353 struct mt76_txq *mtxq = (struct mt76_txq *)txq->drv_priv; 354 struct sk_buff *skb; 355 356 if (!(tids & 1)) 357 continue; 358 359 do { 360 skb = mt76_txq_dequeue(phy, mtxq); 361 if (!skb) 362 break; 363 364 nframes--; 365 if (last_skb) 366 mt76_queue_ps_skb(dev, sta, last_skb, false); 367 368 last_skb = skb; 369 } while (nframes); 370 } 371 372 if (last_skb) { 373 mt76_queue_ps_skb(dev, sta, last_skb, true); 374 dev->queue_ops->kick(dev, hwq); 375 } else { 376 ieee80211_sta_eosp(sta); 377 } 378 379 spin_unlock_bh(&hwq->lock); 380 } 381 EXPORT_SYMBOL_GPL(mt76_release_buffered_frames); 382 383 static int 384 mt76_txq_send_burst(struct mt76_phy *phy, struct mt76_queue *q, 385 struct mt76_txq *mtxq) 386 { 387 struct mt76_dev *dev = phy->dev; 388 struct ieee80211_txq *txq = mtxq_to_txq(mtxq); 389 enum mt76_txq_id qid = mt76_txq_get_qid(txq); 390 struct mt76_wcid *wcid = mtxq->wcid; 391 struct ieee80211_tx_info *info; 392 struct sk_buff *skb; 393 int n_frames = 1; 394 bool stop = false; 395 int idx; 396 397 if (test_bit(MT_WCID_FLAG_PS, &wcid->flags)) 398 return 0; 399 400 if (atomic_read(&wcid->non_aql_packets) >= MT_MAX_NON_AQL_PKT) 401 return 0; 402 403 skb = mt76_txq_dequeue(phy, mtxq); 404 if (!skb) 405 return 0; 406 407 info = IEEE80211_SKB_CB(skb); 408 if (!(wcid->tx_info & MT_WCID_TX_INFO_SET)) 409 ieee80211_get_tx_rates(txq->vif, txq->sta, skb, 410 info->control.rates, 1); 411 412 idx = __mt76_tx_queue_skb(dev, qid, skb, wcid, txq->sta, &stop); 413 if (idx < 0) 414 return idx; 415 416 do { 417 if (test_bit(MT76_STATE_PM, &phy->state) || 418 test_bit(MT76_RESET, &phy->state)) 419 return -EBUSY; 420 421 if (stop) 422 break; 423 424 if (q->queued + MT_TXQ_FREE_THR >= q->ndesc) 425 break; 426 427 skb = mt76_txq_dequeue(phy, mtxq); 428 if (!skb) 429 break; 430 431 info = IEEE80211_SKB_CB(skb); 432 if (!(wcid->tx_info & MT_WCID_TX_INFO_SET)) 433 ieee80211_get_tx_rates(txq->vif, txq->sta, skb, 434 info->control.rates, 1); 435 436 idx = __mt76_tx_queue_skb(dev, qid, skb, wcid, txq->sta, &stop); 437 if (idx < 0) 438 break; 439 440 n_frames++; 441 } while (1); 442 443 dev->queue_ops->kick(dev, q); 444 445 return n_frames; 446 } 447 448 static int 449 mt76_txq_schedule_list(struct mt76_phy *phy, enum mt76_txq_id qid) 450 { 451 struct mt76_dev *dev = phy->dev; 452 struct mt76_queue *q = dev->q_tx[qid]; 453 struct ieee80211_txq *txq; 454 struct mt76_txq *mtxq; 455 struct mt76_wcid *wcid; 456 int ret = 0; 457 458 spin_lock_bh(&q->lock); 459 while (1) { 460 if (test_bit(MT76_STATE_PM, &phy->state) || 461 test_bit(MT76_RESET, &phy->state)) { 462 ret = -EBUSY; 463 break; 464 } 465 466 if (q->queued + MT_TXQ_FREE_THR >= q->ndesc) 467 break; 468 469 txq = ieee80211_next_txq(phy->hw, qid); 470 if (!txq) 471 break; 472 473 mtxq = (struct mt76_txq *)txq->drv_priv; 474 wcid = mtxq->wcid; 475 if (wcid && test_bit(MT_WCID_FLAG_PS, &wcid->flags)) 476 continue; 477 478 if (mtxq->send_bar && mtxq->aggr) { 479 struct ieee80211_txq *txq = mtxq_to_txq(mtxq); 480 struct ieee80211_sta *sta = txq->sta; 481 struct ieee80211_vif *vif = txq->vif; 482 u16 agg_ssn = mtxq->agg_ssn; 483 u8 tid = txq->tid; 484 485 mtxq->send_bar = false; 486 spin_unlock_bh(&q->lock); 487 ieee80211_send_bar(vif, sta->addr, tid, agg_ssn); 488 spin_lock_bh(&q->lock); 489 } 490 491 ret += mt76_txq_send_burst(phy, q, mtxq); 492 ieee80211_return_txq(phy->hw, txq, false); 493 } 494 spin_unlock_bh(&q->lock); 495 496 return ret; 497 } 498 499 void mt76_txq_schedule(struct mt76_phy *phy, enum mt76_txq_id qid) 500 { 501 int len; 502 503 if (qid >= 4) 504 return; 505 506 rcu_read_lock(); 507 508 do { 509 ieee80211_txq_schedule_start(phy->hw, qid); 510 len = mt76_txq_schedule_list(phy, qid); 511 ieee80211_txq_schedule_end(phy->hw, qid); 512 } while (len > 0); 513 514 rcu_read_unlock(); 515 } 516 EXPORT_SYMBOL_GPL(mt76_txq_schedule); 517 518 void mt76_txq_schedule_all(struct mt76_phy *phy) 519 { 520 int i; 521 522 for (i = 0; i <= MT_TXQ_BK; i++) 523 mt76_txq_schedule(phy, i); 524 } 525 EXPORT_SYMBOL_GPL(mt76_txq_schedule_all); 526 527 void mt76_tx_worker(struct mt76_worker *w) 528 { 529 struct mt76_dev *dev = container_of(w, struct mt76_dev, tx_worker); 530 531 mt76_txq_schedule_all(&dev->phy); 532 if (dev->phy2) 533 mt76_txq_schedule_all(dev->phy2); 534 535 #ifdef CONFIG_NL80211_TESTMODE 536 if (dev->test.tx_pending) 537 mt76_testmode_tx_pending(dev); 538 #endif 539 } 540 541 void mt76_stop_tx_queues(struct mt76_dev *dev, struct ieee80211_sta *sta, 542 bool send_bar) 543 { 544 int i; 545 546 for (i = 0; i < ARRAY_SIZE(sta->txq); i++) { 547 struct ieee80211_txq *txq = sta->txq[i]; 548 struct mt76_queue *hwq; 549 struct mt76_txq *mtxq; 550 551 if (!txq) 552 continue; 553 554 hwq = dev->q_tx[mt76_txq_get_qid(txq)]; 555 mtxq = (struct mt76_txq *)txq->drv_priv; 556 557 spin_lock_bh(&hwq->lock); 558 mtxq->send_bar = mtxq->aggr && send_bar; 559 spin_unlock_bh(&hwq->lock); 560 } 561 } 562 EXPORT_SYMBOL_GPL(mt76_stop_tx_queues); 563 564 void mt76_wake_tx_queue(struct ieee80211_hw *hw, struct ieee80211_txq *txq) 565 { 566 struct mt76_phy *phy = hw->priv; 567 struct mt76_dev *dev = phy->dev; 568 569 if (!test_bit(MT76_STATE_RUNNING, &phy->state)) 570 return; 571 572 mt76_worker_schedule(&dev->tx_worker); 573 } 574 EXPORT_SYMBOL_GPL(mt76_wake_tx_queue); 575 576 u8 mt76_ac_to_hwq(u8 ac) 577 { 578 static const u8 wmm_queue_map[] = { 579 [IEEE80211_AC_BE] = 0, 580 [IEEE80211_AC_BK] = 1, 581 [IEEE80211_AC_VI] = 2, 582 [IEEE80211_AC_VO] = 3, 583 }; 584 585 if (WARN_ON(ac >= IEEE80211_NUM_ACS)) 586 return 0; 587 588 return wmm_queue_map[ac]; 589 } 590 EXPORT_SYMBOL_GPL(mt76_ac_to_hwq); 591 592 int mt76_skb_adjust_pad(struct sk_buff *skb, int pad) 593 { 594 struct sk_buff *iter, *last = skb; 595 596 /* First packet of a A-MSDU burst keeps track of the whole burst 597 * length, need to update length of it and the last packet. 598 */ 599 skb_walk_frags(skb, iter) { 600 last = iter; 601 if (!iter->next) { 602 skb->data_len += pad; 603 skb->len += pad; 604 break; 605 } 606 } 607 608 if (skb_pad(last, pad)) 609 return -ENOMEM; 610 611 __skb_put(last, pad); 612 613 return 0; 614 } 615 EXPORT_SYMBOL_GPL(mt76_skb_adjust_pad); 616 617 void mt76_queue_tx_complete(struct mt76_dev *dev, struct mt76_queue *q, 618 struct mt76_queue_entry *e) 619 { 620 if (e->skb) 621 dev->drv->tx_complete_skb(dev, e); 622 623 spin_lock_bh(&q->lock); 624 q->tail = (q->tail + 1) % q->ndesc; 625 q->queued--; 626 spin_unlock_bh(&q->lock); 627 } 628 EXPORT_SYMBOL_GPL(mt76_queue_tx_complete); 629