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_phy *phy, 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 = phy->q_tx[qid]; 234 struct mt76_dev *dev = phy->dev; 235 bool non_aql; 236 int pending; 237 int idx; 238 239 non_aql = !info->tx_time_est; 240 idx = dev->queue_ops->tx_queue_skb(dev, q, skb, wcid, sta); 241 if (idx < 0 || !sta || !non_aql) 242 return idx; 243 244 wcid = (struct mt76_wcid *)sta->drv_priv; 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 !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 276 !ieee80211_is_data(hdr->frame_control) && 277 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 278 qid = MT_TXQ_PSD; 279 skb_set_queue_mapping(skb, qid); 280 } 281 282 if (!(wcid->tx_info & MT_WCID_TX_INFO_SET)) 283 ieee80211_get_tx_rates(info->control.vif, sta, skb, 284 info->control.rates, 1); 285 286 if (ext_phy) 287 info->hw_queue |= MT_TX_HW_QUEUE_EXT_PHY; 288 289 q = phy->q_tx[qid]; 290 291 spin_lock_bh(&q->lock); 292 __mt76_tx_queue_skb(phy, qid, skb, wcid, sta, NULL); 293 dev->queue_ops->kick(dev, q); 294 spin_unlock_bh(&q->lock); 295 } 296 EXPORT_SYMBOL_GPL(mt76_tx); 297 298 static struct sk_buff * 299 mt76_txq_dequeue(struct mt76_phy *phy, struct mt76_txq *mtxq) 300 { 301 struct ieee80211_txq *txq = mtxq_to_txq(mtxq); 302 struct ieee80211_tx_info *info; 303 bool ext_phy = phy != &phy->dev->phy; 304 struct sk_buff *skb; 305 306 skb = ieee80211_tx_dequeue(phy->hw, txq); 307 if (!skb) 308 return NULL; 309 310 info = IEEE80211_SKB_CB(skb); 311 if (ext_phy) 312 info->hw_queue |= MT_TX_HW_QUEUE_EXT_PHY; 313 314 return skb; 315 } 316 317 static void 318 mt76_queue_ps_skb(struct mt76_phy *phy, struct ieee80211_sta *sta, 319 struct sk_buff *skb, bool last) 320 { 321 struct mt76_wcid *wcid = (struct mt76_wcid *)sta->drv_priv; 322 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 323 324 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE; 325 if (last) 326 info->flags |= IEEE80211_TX_STATUS_EOSP | 327 IEEE80211_TX_CTL_REQ_TX_STATUS; 328 329 mt76_skb_set_moredata(skb, !last); 330 __mt76_tx_queue_skb(phy, MT_TXQ_PSD, skb, wcid, sta, NULL); 331 } 332 333 void 334 mt76_release_buffered_frames(struct ieee80211_hw *hw, struct ieee80211_sta *sta, 335 u16 tids, int nframes, 336 enum ieee80211_frame_release_type reason, 337 bool more_data) 338 { 339 struct mt76_phy *phy = hw->priv; 340 struct mt76_dev *dev = phy->dev; 341 struct sk_buff *last_skb = NULL; 342 struct mt76_queue *hwq = phy->q_tx[MT_TXQ_PSD]; 343 int i; 344 345 spin_lock_bh(&hwq->lock); 346 for (i = 0; tids && nframes; i++, tids >>= 1) { 347 struct ieee80211_txq *txq = sta->txq[i]; 348 struct mt76_txq *mtxq = (struct mt76_txq *)txq->drv_priv; 349 struct sk_buff *skb; 350 351 if (!(tids & 1)) 352 continue; 353 354 do { 355 skb = mt76_txq_dequeue(phy, mtxq); 356 if (!skb) 357 break; 358 359 nframes--; 360 if (last_skb) 361 mt76_queue_ps_skb(phy, sta, last_skb, false); 362 363 last_skb = skb; 364 } while (nframes); 365 } 366 367 if (last_skb) { 368 mt76_queue_ps_skb(phy, sta, last_skb, true); 369 dev->queue_ops->kick(dev, hwq); 370 } else { 371 ieee80211_sta_eosp(sta); 372 } 373 374 spin_unlock_bh(&hwq->lock); 375 } 376 EXPORT_SYMBOL_GPL(mt76_release_buffered_frames); 377 378 static bool 379 mt76_txq_stopped(struct mt76_queue *q) 380 { 381 return q->stopped || q->blocked || 382 q->queued + MT_TXQ_FREE_THR >= q->ndesc; 383 } 384 385 static int 386 mt76_txq_send_burst(struct mt76_phy *phy, struct mt76_queue *q, 387 struct mt76_txq *mtxq) 388 { 389 struct mt76_dev *dev = phy->dev; 390 struct ieee80211_txq *txq = mtxq_to_txq(mtxq); 391 enum mt76_txq_id qid = mt76_txq_get_qid(txq); 392 struct mt76_wcid *wcid = mtxq->wcid; 393 struct ieee80211_tx_info *info; 394 struct sk_buff *skb; 395 int n_frames = 1; 396 bool stop = false; 397 int idx; 398 399 if (test_bit(MT_WCID_FLAG_PS, &wcid->flags)) 400 return 0; 401 402 if (atomic_read(&wcid->non_aql_packets) >= MT_MAX_NON_AQL_PKT) 403 return 0; 404 405 skb = mt76_txq_dequeue(phy, mtxq); 406 if (!skb) 407 return 0; 408 409 info = IEEE80211_SKB_CB(skb); 410 if (!(wcid->tx_info & MT_WCID_TX_INFO_SET)) 411 ieee80211_get_tx_rates(txq->vif, txq->sta, skb, 412 info->control.rates, 1); 413 414 idx = __mt76_tx_queue_skb(phy, qid, skb, wcid, txq->sta, &stop); 415 if (idx < 0) 416 return idx; 417 418 do { 419 if (test_bit(MT76_STATE_PM, &phy->state) || 420 test_bit(MT76_RESET, &phy->state)) 421 return -EBUSY; 422 423 if (stop || mt76_txq_stopped(q)) 424 break; 425 426 skb = mt76_txq_dequeue(phy, mtxq); 427 if (!skb) 428 break; 429 430 info = IEEE80211_SKB_CB(skb); 431 if (!(wcid->tx_info & MT_WCID_TX_INFO_SET)) 432 ieee80211_get_tx_rates(txq->vif, txq->sta, skb, 433 info->control.rates, 1); 434 435 idx = __mt76_tx_queue_skb(phy, qid, skb, wcid, txq->sta, &stop); 436 if (idx < 0) 437 break; 438 439 n_frames++; 440 } while (1); 441 442 dev->queue_ops->kick(dev, q); 443 444 return n_frames; 445 } 446 447 static int 448 mt76_txq_schedule_list(struct mt76_phy *phy, enum mt76_txq_id qid) 449 { 450 struct mt76_queue *q = phy->q_tx[qid]; 451 struct mt76_dev *dev = phy->dev; 452 struct ieee80211_txq *txq; 453 struct mt76_txq *mtxq; 454 struct mt76_wcid *wcid; 455 int ret = 0; 456 457 spin_lock_bh(&q->lock); 458 while (1) { 459 if (test_bit(MT76_STATE_PM, &phy->state) || 460 test_bit(MT76_RESET, &phy->state)) { 461 ret = -EBUSY; 462 break; 463 } 464 465 if (dev->queue_ops->tx_cleanup && 466 q->queued + 2 * MT_TXQ_FREE_THR >= q->ndesc) { 467 spin_unlock_bh(&q->lock); 468 dev->queue_ops->tx_cleanup(dev, q, false); 469 spin_lock_bh(&q->lock); 470 } 471 472 if (mt76_txq_stopped(q)) 473 break; 474 475 txq = ieee80211_next_txq(phy->hw, qid); 476 if (!txq) 477 break; 478 479 mtxq = (struct mt76_txq *)txq->drv_priv; 480 wcid = mtxq->wcid; 481 if (wcid && test_bit(MT_WCID_FLAG_PS, &wcid->flags)) 482 continue; 483 484 if (mtxq->send_bar && mtxq->aggr) { 485 struct ieee80211_txq *txq = mtxq_to_txq(mtxq); 486 struct ieee80211_sta *sta = txq->sta; 487 struct ieee80211_vif *vif = txq->vif; 488 u16 agg_ssn = mtxq->agg_ssn; 489 u8 tid = txq->tid; 490 491 mtxq->send_bar = false; 492 spin_unlock_bh(&q->lock); 493 ieee80211_send_bar(vif, sta->addr, tid, agg_ssn); 494 spin_lock_bh(&q->lock); 495 } 496 497 ret += mt76_txq_send_burst(phy, q, mtxq); 498 ieee80211_return_txq(phy->hw, txq, false); 499 } 500 spin_unlock_bh(&q->lock); 501 502 return ret; 503 } 504 505 void mt76_txq_schedule(struct mt76_phy *phy, enum mt76_txq_id qid) 506 { 507 int len; 508 509 if (qid >= 4) 510 return; 511 512 rcu_read_lock(); 513 514 do { 515 ieee80211_txq_schedule_start(phy->hw, qid); 516 len = mt76_txq_schedule_list(phy, qid); 517 ieee80211_txq_schedule_end(phy->hw, qid); 518 } while (len > 0); 519 520 rcu_read_unlock(); 521 } 522 EXPORT_SYMBOL_GPL(mt76_txq_schedule); 523 524 void mt76_txq_schedule_all(struct mt76_phy *phy) 525 { 526 int i; 527 528 for (i = 0; i <= MT_TXQ_BK; i++) 529 mt76_txq_schedule(phy, i); 530 } 531 EXPORT_SYMBOL_GPL(mt76_txq_schedule_all); 532 533 void mt76_tx_worker(struct mt76_worker *w) 534 { 535 struct mt76_dev *dev = container_of(w, struct mt76_dev, tx_worker); 536 537 mt76_txq_schedule_all(&dev->phy); 538 if (dev->phy2) 539 mt76_txq_schedule_all(dev->phy2); 540 541 #ifdef CONFIG_NL80211_TESTMODE 542 if (dev->test.tx_pending) 543 mt76_testmode_tx_pending(dev); 544 #endif 545 } 546 547 void mt76_stop_tx_queues(struct mt76_phy *phy, struct ieee80211_sta *sta, 548 bool send_bar) 549 { 550 int i; 551 552 for (i = 0; i < ARRAY_SIZE(sta->txq); i++) { 553 struct ieee80211_txq *txq = sta->txq[i]; 554 struct mt76_queue *hwq; 555 struct mt76_txq *mtxq; 556 557 if (!txq) 558 continue; 559 560 hwq = phy->q_tx[mt76_txq_get_qid(txq)]; 561 mtxq = (struct mt76_txq *)txq->drv_priv; 562 563 spin_lock_bh(&hwq->lock); 564 mtxq->send_bar = mtxq->aggr && send_bar; 565 spin_unlock_bh(&hwq->lock); 566 } 567 } 568 EXPORT_SYMBOL_GPL(mt76_stop_tx_queues); 569 570 void mt76_wake_tx_queue(struct ieee80211_hw *hw, struct ieee80211_txq *txq) 571 { 572 struct mt76_phy *phy = hw->priv; 573 struct mt76_dev *dev = phy->dev; 574 575 if (!test_bit(MT76_STATE_RUNNING, &phy->state)) 576 return; 577 578 mt76_worker_schedule(&dev->tx_worker); 579 } 580 EXPORT_SYMBOL_GPL(mt76_wake_tx_queue); 581 582 u8 mt76_ac_to_hwq(u8 ac) 583 { 584 static const u8 wmm_queue_map[] = { 585 [IEEE80211_AC_BE] = 0, 586 [IEEE80211_AC_BK] = 1, 587 [IEEE80211_AC_VI] = 2, 588 [IEEE80211_AC_VO] = 3, 589 }; 590 591 if (WARN_ON(ac >= IEEE80211_NUM_ACS)) 592 return 0; 593 594 return wmm_queue_map[ac]; 595 } 596 EXPORT_SYMBOL_GPL(mt76_ac_to_hwq); 597 598 int mt76_skb_adjust_pad(struct sk_buff *skb, int pad) 599 { 600 struct sk_buff *iter, *last = skb; 601 602 /* First packet of a A-MSDU burst keeps track of the whole burst 603 * length, need to update length of it and the last packet. 604 */ 605 skb_walk_frags(skb, iter) { 606 last = iter; 607 if (!iter->next) { 608 skb->data_len += pad; 609 skb->len += pad; 610 break; 611 } 612 } 613 614 if (skb_pad(last, pad)) 615 return -ENOMEM; 616 617 __skb_put(last, pad); 618 619 return 0; 620 } 621 EXPORT_SYMBOL_GPL(mt76_skb_adjust_pad); 622 623 void mt76_queue_tx_complete(struct mt76_dev *dev, struct mt76_queue *q, 624 struct mt76_queue_entry *e) 625 { 626 if (e->skb) 627 dev->drv->tx_complete_skb(dev, e); 628 629 spin_lock_bh(&q->lock); 630 q->tail = (q->tail + 1) % q->ndesc; 631 q->queued--; 632 spin_unlock_bh(&q->lock); 633 } 634 EXPORT_SYMBOL_GPL(mt76_queue_tx_complete); 635