1721 lines · c
1/*2 * Atheros CARL9170 driver3 *4 * 802.11 xmit & status routines5 *6 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>7 * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>8 *9 * This program is free software; you can redistribute it and/or modify10 * it under the terms of the GNU General Public License as published by11 * the Free Software Foundation; either version 2 of the License, or12 * (at your option) any later version.13 *14 * This program is distributed in the hope that it will be useful,15 * but WITHOUT ANY WARRANTY; without even the implied warranty of16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the17 * GNU General Public License for more details.18 *19 * You should have received a copy of the GNU General Public License20 * along with this program; see the file COPYING. If not, see21 * http://www.gnu.org/licenses/.22 *23 * This file incorporates work covered by the following copyright and24 * permission notice:25 * Copyright (c) 2007-2008 Atheros Communications, Inc.26 *27 * Permission to use, copy, modify, and/or distribute this software for any28 * purpose with or without fee is hereby granted, provided that the above29 * copyright notice and this permission notice appear in all copies.30 *31 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES32 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF33 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR34 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES35 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN36 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF37 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.38 */39 40#include <linux/slab.h>41#include <linux/module.h>42#include <linux/etherdevice.h>43#include <net/mac80211.h>44#include "carl9170.h"45#include "hw.h"46#include "cmd.h"47 48static inline unsigned int __carl9170_get_queue(struct ar9170 *ar,49 unsigned int queue)50{51 if (unlikely(modparam_noht)) {52 return queue;53 } else {54 /*55 * This is just another workaround, until56 * someone figures out how to get QoS and57 * AMPDU to play nicely together.58 */59 60 return 2; /* AC_BE */61 }62}63 64static inline unsigned int carl9170_get_queue(struct ar9170 *ar,65 struct sk_buff *skb)66{67 return __carl9170_get_queue(ar, skb_get_queue_mapping(skb));68}69 70static bool is_mem_full(struct ar9170 *ar)71{72 return (DIV_ROUND_UP(IEEE80211_MAX_FRAME_LEN, ar->fw.mem_block_size) >73 atomic_read(&ar->mem_free_blocks));74}75 76static void carl9170_tx_accounting(struct ar9170 *ar, struct sk_buff *skb)77{78 int queue, i;79 bool mem_full;80 81 atomic_inc(&ar->tx_total_queued);82 83 queue = skb_get_queue_mapping(skb);84 spin_lock_bh(&ar->tx_stats_lock);85 86 /*87 * The driver has to accept the frame, regardless if the queue is88 * full to the brim, or not. We have to do the queuing internally,89 * since mac80211 assumes that a driver which can operate with90 * aggregated frames does not reject frames for this reason.91 */92 ar->tx_stats[queue].len++;93 ar->tx_stats[queue].count++;94 95 mem_full = is_mem_full(ar);96 for (i = 0; i < ar->hw->queues; i++) {97 if (mem_full || ar->tx_stats[i].len >= ar->tx_stats[i].limit) {98 ieee80211_stop_queue(ar->hw, i);99 ar->queue_stop_timeout[i] = jiffies;100 }101 }102 103 spin_unlock_bh(&ar->tx_stats_lock);104}105 106/* needs rcu_read_lock */107static struct ieee80211_sta *__carl9170_get_tx_sta(struct ar9170 *ar,108 struct sk_buff *skb)109{110 struct _carl9170_tx_superframe *super = (void *) skb->data;111 struct ieee80211_hdr *hdr = (void *) super->frame_data;112 struct ieee80211_vif *vif;113 unsigned int vif_id;114 115 vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >>116 CARL9170_TX_SUPER_MISC_VIF_ID_S;117 118 if (WARN_ON_ONCE(vif_id >= AR9170_MAX_VIRTUAL_MAC))119 return NULL;120 121 vif = rcu_dereference(ar->vif_priv[vif_id].vif);122 if (unlikely(!vif))123 return NULL;124 125 /*126 * Normally we should use wrappers like ieee80211_get_DA to get127 * the correct peer ieee80211_sta.128 *129 * But there is a problem with indirect traffic (broadcasts, or130 * data which is designated for other stations) in station mode.131 * The frame will be directed to the AP for distribution and not132 * to the actual destination.133 */134 135 return ieee80211_find_sta(vif, hdr->addr1);136}137 138static void carl9170_tx_ps_unblock(struct ar9170 *ar, struct sk_buff *skb)139{140 struct ieee80211_sta *sta;141 struct carl9170_sta_info *sta_info;142 143 rcu_read_lock();144 sta = __carl9170_get_tx_sta(ar, skb);145 if (unlikely(!sta))146 goto out_rcu;147 148 sta_info = (struct carl9170_sta_info *) sta->drv_priv;149 if (atomic_dec_return(&sta_info->pending_frames) == 0)150 ieee80211_sta_block_awake(ar->hw, sta, false);151 152out_rcu:153 rcu_read_unlock();154}155 156static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb)157{158 int queue;159 160 queue = skb_get_queue_mapping(skb);161 162 spin_lock_bh(&ar->tx_stats_lock);163 164 ar->tx_stats[queue].len--;165 166 if (!is_mem_full(ar)) {167 unsigned int i;168 for (i = 0; i < ar->hw->queues; i++) {169 if (ar->tx_stats[i].len >= CARL9170_NUM_TX_LIMIT_SOFT)170 continue;171 172 if (ieee80211_queue_stopped(ar->hw, i)) {173 unsigned long tmp;174 175 tmp = jiffies - ar->queue_stop_timeout[i];176 if (tmp > ar->max_queue_stop_timeout[i])177 ar->max_queue_stop_timeout[i] = tmp;178 }179 180 ieee80211_wake_queue(ar->hw, i);181 }182 }183 184 spin_unlock_bh(&ar->tx_stats_lock);185 186 if (atomic_dec_and_test(&ar->tx_total_queued))187 complete(&ar->tx_flush);188}189 190static int carl9170_alloc_dev_space(struct ar9170 *ar, struct sk_buff *skb)191{192 struct _carl9170_tx_superframe *super;193 unsigned int chunks;194 int cookie = -1;195 196 atomic_inc(&ar->mem_allocs);197 198 chunks = DIV_ROUND_UP(skb->len, ar->fw.mem_block_size);199 if (unlikely(atomic_sub_return(chunks, &ar->mem_free_blocks) < 0)) {200 atomic_add(chunks, &ar->mem_free_blocks);201 return -ENOSPC;202 }203 204 spin_lock_bh(&ar->mem_lock);205 cookie = bitmap_find_free_region(ar->mem_bitmap, ar->fw.mem_blocks, 0);206 spin_unlock_bh(&ar->mem_lock);207 208 if (unlikely(cookie < 0)) {209 atomic_add(chunks, &ar->mem_free_blocks);210 return -ENOSPC;211 }212 213 super = (void *) skb->data;214 215 /*216 * Cookie #0 serves two special purposes:217 * 1. The firmware might use it generate BlockACK frames218 * in responds of an incoming BlockAckReqs.219 *220 * 2. Prevent double-free bugs.221 */222 super->s.cookie = (u8) cookie + 1;223 return 0;224}225 226static void carl9170_release_dev_space(struct ar9170 *ar, struct sk_buff *skb)227{228 struct _carl9170_tx_superframe *super = (void *) skb->data;229 int cookie;230 231 /* make a local copy of the cookie */232 cookie = super->s.cookie;233 /* invalidate cookie */234 super->s.cookie = 0;235 236 /*237 * Do a out-of-bounds check on the cookie:238 *239 * * cookie "0" is reserved and won't be assigned to any240 * out-going frame. Internally however, it is used to241 * mark no longer/un-accounted frames and serves as a242 * cheap way of preventing frames from being freed243 * twice by _accident_. NB: There is a tiny race...244 *245 * * obviously, cookie number is limited by the amount246 * of available memory blocks, so the number can247 * never execeed the mem_blocks count.248 */249 if (WARN_ON_ONCE(cookie == 0) ||250 WARN_ON_ONCE(cookie > ar->fw.mem_blocks))251 return;252 253 atomic_add(DIV_ROUND_UP(skb->len, ar->fw.mem_block_size),254 &ar->mem_free_blocks);255 256 spin_lock_bh(&ar->mem_lock);257 bitmap_release_region(ar->mem_bitmap, cookie - 1, 0);258 spin_unlock_bh(&ar->mem_lock);259}260 261/* Called from any context */262static void carl9170_tx_release(struct kref *ref)263{264 struct ar9170 *ar;265 struct carl9170_tx_info *arinfo;266 struct ieee80211_tx_info *txinfo;267 struct sk_buff *skb;268 269 arinfo = container_of(ref, struct carl9170_tx_info, ref);270 txinfo = container_of((void *) arinfo, struct ieee80211_tx_info,271 rate_driver_data);272 skb = container_of((void *) txinfo, struct sk_buff, cb);273 274 ar = arinfo->ar;275 if (WARN_ON_ONCE(!ar))276 return;277 278 /*279 * This does not call ieee80211_tx_info_clear_status() because280 * carl9170_tx_fill_rateinfo() has filled the rate information281 * before we get to this point.282 */283 memset(&txinfo->pad, 0, sizeof(txinfo->pad));284 memset(&txinfo->rate_driver_data, 0, sizeof(txinfo->rate_driver_data));285 286 if (atomic_read(&ar->tx_total_queued))287 ar->tx_schedule = true;288 289 if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) {290 if (!atomic_read(&ar->tx_ampdu_upload))291 ar->tx_ampdu_schedule = true;292 293 if (txinfo->flags & IEEE80211_TX_STAT_AMPDU) {294 struct _carl9170_tx_superframe *super;295 296 super = (void *)skb->data;297 txinfo->status.ampdu_len = super->s.rix;298 txinfo->status.ampdu_ack_len = super->s.cnt;299 } else if ((txinfo->flags & IEEE80211_TX_STAT_ACK) &&300 !(txinfo->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) {301 /*302 * drop redundant tx_status reports:303 *304 * 1. ampdu_ack_len of the final tx_status does305 * include the feedback of this particular frame.306 *307 * 2. tx_status_irqsafe only queues up to 128308 * tx feedback reports and discards the rest.309 *310 * 3. minstrel_ht is picky, it only accepts311 * reports of frames with the TX_STATUS_AMPDU flag.312 *313 * 4. mac80211 is not particularly interested in314 * feedback either [CTL_REQ_TX_STATUS not set]315 */316 317 ieee80211_free_txskb(ar->hw, skb);318 return;319 } else {320 /*321 * Either the frame transmission has failed or322 * mac80211 requested tx status.323 */324 }325 }326 327 skb_pull(skb, sizeof(struct _carl9170_tx_superframe));328 ieee80211_tx_status_irqsafe(ar->hw, skb);329}330 331void carl9170_tx_get_skb(struct sk_buff *skb)332{333 struct carl9170_tx_info *arinfo = (void *)334 (IEEE80211_SKB_CB(skb))->rate_driver_data;335 kref_get(&arinfo->ref);336}337 338int carl9170_tx_put_skb(struct sk_buff *skb)339{340 struct carl9170_tx_info *arinfo = (void *)341 (IEEE80211_SKB_CB(skb))->rate_driver_data;342 343 return kref_put(&arinfo->ref, carl9170_tx_release);344}345 346/* Caller must hold the tid_info->lock & rcu_read_lock */347static void carl9170_tx_shift_bm(struct ar9170 *ar,348 struct carl9170_sta_tid *tid_info, u16 seq)349{350 u16 off;351 352 off = SEQ_DIFF(seq, tid_info->bsn);353 354 if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))355 return;356 357 /*358 * Sanity check. For each MPDU we set the bit in bitmap and359 * clear it once we received the tx_status.360 * But if the bit is already cleared then we've been bitten361 * by a bug.362 */363 WARN_ON_ONCE(!test_and_clear_bit(off, tid_info->bitmap));364 365 off = SEQ_DIFF(tid_info->snx, tid_info->bsn);366 if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))367 return;368 369 if (!bitmap_empty(tid_info->bitmap, off))370 off = find_first_bit(tid_info->bitmap, off);371 372 tid_info->bsn += off;373 tid_info->bsn &= 0x0fff;374 375 bitmap_shift_right(tid_info->bitmap, tid_info->bitmap,376 off, CARL9170_BAW_BITS);377}378 379static void carl9170_tx_status_process_ampdu(struct ar9170 *ar,380 struct sk_buff *skb, struct ieee80211_tx_info *txinfo)381{382 struct _carl9170_tx_superframe *super = (void *) skb->data;383 struct ieee80211_hdr *hdr = (void *) super->frame_data;384 struct ieee80211_sta *sta;385 struct carl9170_sta_info *sta_info;386 struct carl9170_sta_tid *tid_info;387 u8 tid;388 389 if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) ||390 txinfo->flags & IEEE80211_TX_CTL_INJECTED)391 return;392 393 rcu_read_lock();394 sta = __carl9170_get_tx_sta(ar, skb);395 if (unlikely(!sta))396 goto out_rcu;397 398 tid = ieee80211_get_tid(hdr);399 400 sta_info = (void *) sta->drv_priv;401 tid_info = rcu_dereference(sta_info->agg[tid]);402 if (!tid_info)403 goto out_rcu;404 405 spin_lock_bh(&tid_info->lock);406 if (likely(tid_info->state >= CARL9170_TID_STATE_IDLE))407 carl9170_tx_shift_bm(ar, tid_info, get_seq_h(hdr));408 409 if (sta_info->stats[tid].clear) {410 sta_info->stats[tid].clear = false;411 sta_info->stats[tid].req = false;412 sta_info->stats[tid].ampdu_len = 0;413 sta_info->stats[tid].ampdu_ack_len = 0;414 }415 416 sta_info->stats[tid].ampdu_len++;417 if (txinfo->status.rates[0].count == 1)418 sta_info->stats[tid].ampdu_ack_len++;419 420 if (!(txinfo->flags & IEEE80211_TX_STAT_ACK))421 sta_info->stats[tid].req = true;422 423 if (super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_IMM_BA)) {424 super->s.rix = sta_info->stats[tid].ampdu_len;425 super->s.cnt = sta_info->stats[tid].ampdu_ack_len;426 txinfo->flags |= IEEE80211_TX_STAT_AMPDU;427 if (sta_info->stats[tid].req)428 txinfo->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;429 430 sta_info->stats[tid].clear = true;431 }432 spin_unlock_bh(&tid_info->lock);433 434out_rcu:435 rcu_read_unlock();436}437 438static void carl9170_tx_bar_status(struct ar9170 *ar, struct sk_buff *skb,439 struct ieee80211_tx_info *tx_info)440{441 struct _carl9170_tx_superframe *super = (void *) skb->data;442 struct ieee80211_bar *bar = (void *) super->frame_data;443 444 /*445 * Unlike all other frames, the status report for BARs does446 * not directly come from the hardware as it is incapable of447 * matching a BA to a previously send BAR.448 * Instead the RX-path will scan for incoming BAs and set the449 * IEEE80211_TX_STAT_ACK if it sees one that was likely450 * caused by a BAR from us.451 */452 453 if (unlikely(ieee80211_is_back_req(bar->frame_control)) &&454 !(tx_info->flags & IEEE80211_TX_STAT_ACK)) {455 struct carl9170_bar_list_entry *entry;456 int queue = skb_get_queue_mapping(skb);457 458 rcu_read_lock();459 list_for_each_entry_rcu(entry, &ar->bar_list[queue], list) {460 if (entry->skb == skb) {461 spin_lock_bh(&ar->bar_list_lock[queue]);462 list_del_rcu(&entry->list);463 spin_unlock_bh(&ar->bar_list_lock[queue]);464 kfree_rcu(entry, head);465 goto out;466 }467 }468 469 WARN(1, "bar not found in %d - ra:%pM ta:%pM c:%x ssn:%x\n",470 queue, bar->ra, bar->ta, bar->control,471 bar->start_seq_num);472out:473 rcu_read_unlock();474 }475}476 477void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,478 const bool success)479{480 struct ieee80211_tx_info *txinfo;481 482 carl9170_tx_accounting_free(ar, skb);483 484 txinfo = IEEE80211_SKB_CB(skb);485 486 carl9170_tx_bar_status(ar, skb, txinfo);487 488 if (success)489 txinfo->flags |= IEEE80211_TX_STAT_ACK;490 else491 ar->tx_ack_failures++;492 493 if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)494 carl9170_tx_status_process_ampdu(ar, skb, txinfo);495 496 carl9170_tx_ps_unblock(ar, skb);497 carl9170_tx_put_skb(skb);498}499 500/* This function may be called form any context */501void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb)502{503 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);504 505 atomic_dec(&ar->tx_total_pending);506 507 if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)508 atomic_dec(&ar->tx_ampdu_upload);509 510 if (carl9170_tx_put_skb(skb))511 tasklet_hi_schedule(&ar->usb_tasklet);512}513 514static struct sk_buff *carl9170_get_queued_skb(struct ar9170 *ar, u8 cookie,515 struct sk_buff_head *queue)516{517 struct sk_buff *skb;518 519 spin_lock_bh(&queue->lock);520 skb_queue_walk(queue, skb) {521 struct _carl9170_tx_superframe *txc = (void *) skb->data;522 523 if (txc->s.cookie != cookie)524 continue;525 526 __skb_unlink(skb, queue);527 spin_unlock_bh(&queue->lock);528 529 carl9170_release_dev_space(ar, skb);530 return skb;531 }532 spin_unlock_bh(&queue->lock);533 534 return NULL;535}536 537static void carl9170_tx_fill_rateinfo(struct ar9170 *ar, unsigned int rix,538 unsigned int tries, struct ieee80211_tx_info *txinfo)539{540 unsigned int i;541 542 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {543 if (txinfo->status.rates[i].idx < 0)544 break;545 546 if (i == rix) {547 txinfo->status.rates[i].count = tries;548 i++;549 break;550 }551 }552 553 for (; i < IEEE80211_TX_MAX_RATES; i++) {554 txinfo->status.rates[i].idx = -1;555 txinfo->status.rates[i].count = 0;556 }557}558 559static void carl9170_check_queue_stop_timeout(struct ar9170 *ar)560{561 int i;562 struct sk_buff *skb;563 struct ieee80211_tx_info *txinfo;564 struct carl9170_tx_info *arinfo;565 bool restart = false;566 567 for (i = 0; i < ar->hw->queues; i++) {568 spin_lock_bh(&ar->tx_status[i].lock);569 570 skb = skb_peek(&ar->tx_status[i]);571 572 if (!skb)573 goto next;574 575 txinfo = IEEE80211_SKB_CB(skb);576 arinfo = (void *) txinfo->rate_driver_data;577 578 if (time_is_before_jiffies(arinfo->timeout +579 msecs_to_jiffies(CARL9170_QUEUE_STUCK_TIMEOUT)) == true)580 restart = true;581 582next:583 spin_unlock_bh(&ar->tx_status[i].lock);584 }585 586 if (restart) {587 /*588 * At least one queue has been stuck for long enough.589 * Give the device a kick and hope it gets back to590 * work.591 *592 * possible reasons may include:593 * - frames got lost/corrupted (bad connection to the device)594 * - stalled rx processing/usb controller hiccups595 * - firmware errors/bugs596 * - every bug you can think of.597 * - all bugs you can't...598 * - ...599 */600 carl9170_restart(ar, CARL9170_RR_STUCK_TX);601 }602}603 604static void carl9170_tx_ampdu_timeout(struct ar9170 *ar)605{606 struct carl9170_sta_tid *iter;607 struct sk_buff *skb;608 struct ieee80211_tx_info *txinfo;609 struct carl9170_tx_info *arinfo;610 struct ieee80211_sta *sta;611 612 rcu_read_lock();613 list_for_each_entry_rcu(iter, &ar->tx_ampdu_list, list) {614 if (iter->state < CARL9170_TID_STATE_IDLE)615 continue;616 617 spin_lock_bh(&iter->lock);618 skb = skb_peek(&iter->queue);619 if (!skb)620 goto unlock;621 622 txinfo = IEEE80211_SKB_CB(skb);623 arinfo = (void *)txinfo->rate_driver_data;624 if (time_is_after_jiffies(arinfo->timeout +625 msecs_to_jiffies(CARL9170_QUEUE_TIMEOUT)))626 goto unlock;627 628 sta = iter->sta;629 if (WARN_ON(!sta))630 goto unlock;631 632 ieee80211_stop_tx_ba_session(sta, iter->tid);633unlock:634 spin_unlock_bh(&iter->lock);635 636 }637 rcu_read_unlock();638}639 640void carl9170_tx_janitor(struct work_struct *work)641{642 struct ar9170 *ar = container_of(work, struct ar9170,643 tx_janitor.work);644 if (!IS_STARTED(ar))645 return;646 647 ar->tx_janitor_last_run = jiffies;648 649 carl9170_check_queue_stop_timeout(ar);650 carl9170_tx_ampdu_timeout(ar);651 652 if (!atomic_read(&ar->tx_total_queued))653 return;654 655 ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,656 msecs_to_jiffies(CARL9170_TX_TIMEOUT));657}658 659static void __carl9170_tx_process_status(struct ar9170 *ar,660 const uint8_t cookie, const uint8_t info)661{662 struct sk_buff *skb;663 struct ieee80211_tx_info *txinfo;664 unsigned int r, t, q;665 bool success = true;666 667 q = ar9170_qmap(info & CARL9170_TX_STATUS_QUEUE);668 669 skb = carl9170_get_queued_skb(ar, cookie, &ar->tx_status[q]);670 if (!skb) {671 /*672 * We have lost the race to another thread.673 */674 675 return ;676 }677 678 txinfo = IEEE80211_SKB_CB(skb);679 680 if (!(info & CARL9170_TX_STATUS_SUCCESS))681 success = false;682 683 r = (info & CARL9170_TX_STATUS_RIX) >> CARL9170_TX_STATUS_RIX_S;684 t = (info & CARL9170_TX_STATUS_TRIES) >> CARL9170_TX_STATUS_TRIES_S;685 686 carl9170_tx_fill_rateinfo(ar, r, t, txinfo);687 carl9170_tx_status(ar, skb, success);688}689 690void carl9170_tx_process_status(struct ar9170 *ar,691 const struct carl9170_rsp *cmd)692{693 unsigned int i;694 695 for (i = 0; i < cmd->hdr.ext; i++) {696 if (WARN_ON(i > ((cmd->hdr.len / 2) + 1))) {697 print_hex_dump_bytes("UU:", DUMP_PREFIX_NONE,698 (void *) cmd, cmd->hdr.len + 4);699 break;700 }701 702 __carl9170_tx_process_status(ar, cmd->_tx_status[i].cookie,703 cmd->_tx_status[i].info);704 }705}706 707static void carl9170_tx_rate_tpc_chains(struct ar9170 *ar,708 struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate,709 unsigned int *phyrate, unsigned int *tpc, unsigned int *chains)710{711 struct ieee80211_rate *rate = NULL;712 u8 *txpower;713 unsigned int idx;714 715 idx = txrate->idx;716 *tpc = 0;717 *phyrate = 0;718 719 if (txrate->flags & IEEE80211_TX_RC_MCS) {720 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {721 /* +1 dBm for HT40 */722 *tpc += 2;723 724 if (info->band == NL80211_BAND_2GHZ)725 txpower = ar->power_2G_ht40;726 else727 txpower = ar->power_5G_ht40;728 } else {729 if (info->band == NL80211_BAND_2GHZ)730 txpower = ar->power_2G_ht20;731 else732 txpower = ar->power_5G_ht20;733 }734 735 *phyrate = txrate->idx;736 *tpc += txpower[idx & 7];737 } else {738 if (info->band == NL80211_BAND_2GHZ) {739 if (idx < 4)740 txpower = ar->power_2G_cck;741 else742 txpower = ar->power_2G_ofdm;743 } else {744 txpower = ar->power_5G_leg;745 idx += 4;746 }747 748 rate = &__carl9170_ratetable[idx];749 *tpc += txpower[(rate->hw_value & 0x30) >> 4];750 *phyrate = rate->hw_value & 0xf;751 }752 753 if (ar->eeprom.tx_mask == 1) {754 *chains = AR9170_TX_PHY_TXCHAIN_1;755 } else {756 if (!(txrate->flags & IEEE80211_TX_RC_MCS) &&757 rate && rate->bitrate >= 360)758 *chains = AR9170_TX_PHY_TXCHAIN_1;759 else760 *chains = AR9170_TX_PHY_TXCHAIN_2;761 }762 763 *tpc = min_t(unsigned int, *tpc, ar->hw->conf.power_level * 2);764}765 766static __le32 carl9170_tx_physet(struct ar9170 *ar,767 struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate)768{769 unsigned int power = 0, chains = 0, phyrate = 0;770 __le32 tmp;771 772 tmp = cpu_to_le32(0);773 774 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)775 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ <<776 AR9170_TX_PHY_BW_S);777 /* this works because 40 MHz is 2 and dup is 3 */778 if (txrate->flags & IEEE80211_TX_RC_DUP_DATA)779 tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ_DUP <<780 AR9170_TX_PHY_BW_S);781 782 if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)783 tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_GI);784 785 if (txrate->flags & IEEE80211_TX_RC_MCS) {786 SET_VAL(AR9170_TX_PHY_MCS, phyrate, txrate->idx);787 788 /* heavy clip control */789 tmp |= cpu_to_le32((txrate->idx & 0x7) <<790 AR9170_TX_PHY_TX_HEAVY_CLIP_S);791 792 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_HT);793 794 /*795 * green field preamble does not work.796 *797 * if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)798 * tmp |= cpu_to_le32(AR9170_TX_PHY_GREENFIELD);799 */800 } else {801 if (info->band == NL80211_BAND_2GHZ) {802 if (txrate->idx <= AR9170_TX_PHY_RATE_CCK_11M)803 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_CCK);804 else805 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);806 } else {807 tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);808 }809 810 /*811 * short preamble seems to be broken too.812 *813 * if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)814 * tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_PREAMBLE);815 */816 }817 carl9170_tx_rate_tpc_chains(ar, info, txrate,818 &phyrate, &power, &chains);819 820 tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_MCS, phyrate));821 tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TX_PWR, power));822 tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TXCHAIN, chains));823 return tmp;824}825 826static bool carl9170_tx_rts_check(struct ar9170 *ar,827 struct ieee80211_tx_rate *rate,828 bool ampdu, bool multi)829{830 switch (ar->erp_mode) {831 case CARL9170_ERP_AUTO:832 if (ampdu)833 break;834 fallthrough;835 836 case CARL9170_ERP_MAC80211:837 if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS))838 break;839 fallthrough;840 841 case CARL9170_ERP_RTS:842 if (likely(!multi))843 return true;844 break;845 846 default:847 break;848 }849 850 return false;851}852 853static bool carl9170_tx_cts_check(struct ar9170 *ar,854 struct ieee80211_tx_rate *rate)855{856 switch (ar->erp_mode) {857 case CARL9170_ERP_AUTO:858 case CARL9170_ERP_MAC80211:859 if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT))860 break;861 fallthrough;862 863 case CARL9170_ERP_CTS:864 return true;865 866 default:867 break;868 }869 870 return false;871}872 873static void carl9170_tx_get_rates(struct ar9170 *ar,874 struct ieee80211_vif *vif,875 struct ieee80211_sta *sta,876 struct sk_buff *skb)877{878 struct ieee80211_tx_info *info;879 880 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES);881 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES > IEEE80211_TX_RATE_TABLE_SIZE);882 883 info = IEEE80211_SKB_CB(skb);884 885 ieee80211_get_tx_rates(vif, sta, skb,886 info->control.rates,887 IEEE80211_TX_MAX_RATES);888}889 890static void carl9170_tx_apply_rateset(struct ar9170 *ar,891 struct ieee80211_tx_info *sinfo,892 struct sk_buff *skb)893{894 struct ieee80211_tx_rate *txrate;895 struct ieee80211_tx_info *info;896 struct _carl9170_tx_superframe *txc = (void *) skb->data;897 int i;898 bool ampdu;899 bool no_ack;900 901 info = IEEE80211_SKB_CB(skb);902 ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU);903 no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK);904 905 /* Set the rate control probe flag for all (sub-) frames.906 * This is because the TX_STATS_AMPDU flag is only set on907 * the last frame, so it has to be inherited.908 */909 info->flags |= (sinfo->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);910 911 /* NOTE: For the first rate, the ERP & AMPDU flags are directly912 * taken from mac_control. For all fallback rate, the firmware913 * updates the mac_control flags from the rate info field.914 */915 for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {916 __le32 phy_set;917 918 txrate = &sinfo->control.rates[i];919 if (txrate->idx < 0)920 break;921 922 phy_set = carl9170_tx_physet(ar, info, txrate);923 if (i == 0) {924 __le16 mac_tmp = cpu_to_le16(0);925 926 /* first rate - part of the hw's frame header */927 txc->f.phy_control = phy_set;928 929 if (ampdu && txrate->flags & IEEE80211_TX_RC_MCS)930 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);931 932 if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))933 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);934 else if (carl9170_tx_cts_check(ar, txrate))935 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);936 937 txc->f.mac_control |= mac_tmp;938 } else {939 /* fallback rates are stored in the firmware's940 * retry rate set array.941 */942 txc->s.rr[i - 1] = phy_set;943 }944 945 SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i],946 txrate->count);947 948 if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))949 txc->s.ri[i] |= (AR9170_TX_MAC_PROT_RTS <<950 CARL9170_TX_SUPER_RI_ERP_PROT_S);951 else if (carl9170_tx_cts_check(ar, txrate))952 txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS <<953 CARL9170_TX_SUPER_RI_ERP_PROT_S);954 955 if (ampdu && (txrate->flags & IEEE80211_TX_RC_MCS))956 txc->s.ri[i] |= CARL9170_TX_SUPER_RI_AMPDU;957 }958}959 960static int carl9170_tx_prepare(struct ar9170 *ar,961 struct ieee80211_sta *sta,962 struct sk_buff *skb)963{964 struct ieee80211_hdr *hdr;965 struct _carl9170_tx_superframe *txc;966 struct carl9170_vif_info *cvif;967 struct ieee80211_tx_info *info;968 struct carl9170_tx_info *arinfo;969 unsigned int hw_queue;970 __le16 mac_tmp;971 u16 len;972 973 BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));974 BUILD_BUG_ON(sizeof(struct _carl9170_tx_superdesc) !=975 CARL9170_TX_SUPERDESC_LEN);976 977 BUILD_BUG_ON(sizeof(struct _ar9170_tx_hwdesc) !=978 AR9170_TX_HWDESC_LEN);979 980 BUILD_BUG_ON(AR9170_MAX_VIRTUAL_MAC >981 ((CARL9170_TX_SUPER_MISC_VIF_ID >>982 CARL9170_TX_SUPER_MISC_VIF_ID_S) + 1));983 984 hw_queue = ar9170_qmap(carl9170_get_queue(ar, skb));985 986 hdr = (void *)skb->data;987 info = IEEE80211_SKB_CB(skb);988 len = skb->len;989 990 /*991 * Note: If the frame was sent through a monitor interface,992 * the ieee80211_vif pointer can be NULL.993 */994 if (likely(info->control.vif))995 cvif = (void *) info->control.vif->drv_priv;996 else997 cvif = NULL;998 999 txc = skb_push(skb, sizeof(*txc));1000 memset(txc, 0, sizeof(*txc));1001 1002 SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, txc->s.misc, hw_queue);1003 1004 if (likely(cvif))1005 SET_VAL(CARL9170_TX_SUPER_MISC_VIF_ID, txc->s.misc, cvif->id);1006 1007 if (unlikely(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM))1008 txc->s.misc |= CARL9170_TX_SUPER_MISC_CAB;1009 1010 if (unlikely(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))1011 txc->s.misc |= CARL9170_TX_SUPER_MISC_ASSIGN_SEQ;1012 1013 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control)))1014 txc->s.misc |= CARL9170_TX_SUPER_MISC_FILL_IN_TSF;1015 1016 mac_tmp = cpu_to_le16(AR9170_TX_MAC_HW_DURATION |1017 AR9170_TX_MAC_BACKOFF);1018 mac_tmp |= cpu_to_le16((hw_queue << AR9170_TX_MAC_QOS_S) &1019 AR9170_TX_MAC_QOS);1020 1021 if (unlikely(info->flags & IEEE80211_TX_CTL_NO_ACK))1022 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_NO_ACK);1023 1024 if (info->control.hw_key) {1025 len += info->control.hw_key->icv_len;1026 1027 switch (info->control.hw_key->cipher) {1028 case WLAN_CIPHER_SUITE_WEP40:1029 case WLAN_CIPHER_SUITE_WEP104:1030 case WLAN_CIPHER_SUITE_TKIP:1031 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_RC4);1032 break;1033 case WLAN_CIPHER_SUITE_CCMP:1034 mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_AES);1035 break;1036 default:1037 WARN_ON(1);1038 goto err_out;1039 }1040 }1041 1042 if (info->flags & IEEE80211_TX_CTL_AMPDU) {1043 unsigned int density, factor;1044 1045 if (unlikely(!sta || !cvif))1046 goto err_out;1047 1048 factor = min_t(unsigned int, 1u,1049 sta->deflink.ht_cap.ampdu_factor);1050 density = sta->deflink.ht_cap.ampdu_density;1051 1052 if (density) {1053 /*1054 * Watch out!1055 *1056 * Otus uses slightly different density values than1057 * those from the 802.11n spec.1058 */1059 1060 density = max_t(unsigned int, density + 1, 7u);1061 }1062 1063 SET_VAL(CARL9170_TX_SUPER_AMPDU_DENSITY,1064 txc->s.ampdu_settings, density);1065 1066 SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR,1067 txc->s.ampdu_settings, factor);1068 }1069 1070 txc->s.len = cpu_to_le16(skb->len);1071 txc->f.length = cpu_to_le16(len + FCS_LEN);1072 txc->f.mac_control = mac_tmp;1073 1074 arinfo = (void *)info->rate_driver_data;1075 arinfo->timeout = jiffies;1076 arinfo->ar = ar;1077 kref_init(&arinfo->ref);1078 return 0;1079 1080err_out:1081 skb_pull(skb, sizeof(*txc));1082 return -EINVAL;1083}1084 1085static void carl9170_set_immba(struct ar9170 *ar, struct sk_buff *skb)1086{1087 struct _carl9170_tx_superframe *super;1088 1089 super = (void *) skb->data;1090 super->f.mac_control |= cpu_to_le16(AR9170_TX_MAC_IMM_BA);1091}1092 1093static void carl9170_set_ampdu_params(struct ar9170 *ar, struct sk_buff *skb)1094{1095 struct _carl9170_tx_superframe *super;1096 int tmp;1097 1098 super = (void *) skb->data;1099 1100 tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_DENSITY) <<1101 CARL9170_TX_SUPER_AMPDU_DENSITY_S;1102 1103 /*1104 * If you haven't noticed carl9170_tx_prepare has already filled1105 * in all ampdu spacing & factor parameters.1106 * Now it's the time to check whenever the settings have to be1107 * updated by the firmware, or if everything is still the same.1108 *1109 * There's no sane way to handle different density values with1110 * this hardware, so we may as well just do the compare in the1111 * driver.1112 */1113 1114 if (tmp != ar->current_density) {1115 ar->current_density = tmp;1116 super->s.ampdu_settings |=1117 CARL9170_TX_SUPER_AMPDU_COMMIT_DENSITY;1118 }1119 1120 tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_FACTOR) <<1121 CARL9170_TX_SUPER_AMPDU_FACTOR_S;1122 1123 if (tmp != ar->current_factor) {1124 ar->current_factor = tmp;1125 super->s.ampdu_settings |=1126 CARL9170_TX_SUPER_AMPDU_COMMIT_FACTOR;1127 }1128}1129 1130static void carl9170_tx_ampdu(struct ar9170 *ar)1131{1132 struct sk_buff_head agg;1133 struct carl9170_sta_tid *tid_info;1134 struct sk_buff *skb, *first;1135 struct ieee80211_tx_info *tx_info_first;1136 unsigned int i = 0, done_ampdus = 0;1137 u16 seq, queue, tmpssn;1138 1139 atomic_inc(&ar->tx_ampdu_scheduler);1140 ar->tx_ampdu_schedule = false;1141 1142 if (atomic_read(&ar->tx_ampdu_upload))1143 return;1144 1145 if (!ar->tx_ampdu_list_len)1146 return;1147 1148 __skb_queue_head_init(&agg);1149 1150 rcu_read_lock();1151 tid_info = rcu_dereference(ar->tx_ampdu_iter);1152 if (WARN_ON_ONCE(!tid_info)) {1153 rcu_read_unlock();1154 return;1155 }1156 1157retry:1158 list_for_each_entry_continue_rcu(tid_info, &ar->tx_ampdu_list, list) {1159 i++;1160 1161 if (tid_info->state < CARL9170_TID_STATE_PROGRESS)1162 continue;1163 1164 queue = TID_TO_WME_AC(tid_info->tid);1165 1166 spin_lock_bh(&tid_info->lock);1167 if (tid_info->state != CARL9170_TID_STATE_XMIT)1168 goto processed;1169 1170 tid_info->counter++;1171 first = skb_peek(&tid_info->queue);1172 tmpssn = carl9170_get_seq(first);1173 seq = tid_info->snx;1174 1175 if (unlikely(tmpssn != seq)) {1176 tid_info->state = CARL9170_TID_STATE_IDLE;1177 1178 goto processed;1179 }1180 1181 tx_info_first = NULL;1182 while ((skb = skb_peek(&tid_info->queue))) {1183 /* strict 0, 1, ..., n - 1, n frame sequence order */1184 if (unlikely(carl9170_get_seq(skb) != seq))1185 break;1186 1187 /* don't upload more than AMPDU FACTOR allows. */1188 if (unlikely(SEQ_DIFF(tid_info->snx, tid_info->bsn) >=1189 (tid_info->max - 1)))1190 break;1191 1192 if (!tx_info_first) {1193 carl9170_tx_get_rates(ar, tid_info->vif,1194 tid_info->sta, first);1195 tx_info_first = IEEE80211_SKB_CB(first);1196 }1197 1198 carl9170_tx_apply_rateset(ar, tx_info_first, skb);1199 1200 atomic_inc(&ar->tx_ampdu_upload);1201 tid_info->snx = seq = SEQ_NEXT(seq);1202 __skb_unlink(skb, &tid_info->queue);1203 1204 __skb_queue_tail(&agg, skb);1205 1206 if (skb_queue_len(&agg) >= CARL9170_NUM_TX_AGG_MAX)1207 break;1208 }1209 1210 if (skb_queue_empty(&tid_info->queue) ||1211 carl9170_get_seq(skb_peek(&tid_info->queue)) !=1212 tid_info->snx) {1213 /* stop TID, if A-MPDU frames are still missing,1214 * or whenever the queue is empty.1215 */1216 1217 tid_info->state = CARL9170_TID_STATE_IDLE;1218 }1219 done_ampdus++;1220 1221processed:1222 spin_unlock_bh(&tid_info->lock);1223 1224 if (skb_queue_empty(&agg))1225 continue;1226 1227 /* apply ampdu spacing & factor settings */1228 carl9170_set_ampdu_params(ar, skb_peek(&agg));1229 1230 /* set aggregation push bit */1231 carl9170_set_immba(ar, skb_peek_tail(&agg));1232 1233 spin_lock_bh(&ar->tx_pending[queue].lock);1234 skb_queue_splice_tail_init(&agg, &ar->tx_pending[queue]);1235 spin_unlock_bh(&ar->tx_pending[queue].lock);1236 ar->tx_schedule = true;1237 }1238 if ((done_ampdus++ == 0) && (i++ == 0))1239 goto retry;1240 1241 rcu_assign_pointer(ar->tx_ampdu_iter, tid_info);1242 rcu_read_unlock();1243}1244 1245static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar,1246 struct sk_buff_head *queue)1247{1248 struct sk_buff *skb;1249 struct ieee80211_tx_info *info;1250 struct carl9170_tx_info *arinfo;1251 1252 BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));1253 1254 spin_lock_bh(&queue->lock);1255 skb = skb_peek(queue);1256 if (unlikely(!skb))1257 goto err_unlock;1258 1259 if (carl9170_alloc_dev_space(ar, skb))1260 goto err_unlock;1261 1262 __skb_unlink(skb, queue);1263 spin_unlock_bh(&queue->lock);1264 1265 info = IEEE80211_SKB_CB(skb);1266 arinfo = (void *) info->rate_driver_data;1267 1268 arinfo->timeout = jiffies;1269 return skb;1270 1271err_unlock:1272 spin_unlock_bh(&queue->lock);1273 return NULL;1274}1275 1276void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb)1277{1278 struct _carl9170_tx_superframe *super;1279 uint8_t q = 0;1280 1281 ar->tx_dropped++;1282 1283 super = (void *)skb->data;1284 SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, q,1285 ar9170_qmap(carl9170_get_queue(ar, skb)));1286 __carl9170_tx_process_status(ar, super->s.cookie, q);1287}1288 1289static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb)1290{1291 struct ieee80211_sta *sta;1292 struct carl9170_sta_info *sta_info;1293 struct ieee80211_tx_info *tx_info;1294 1295 rcu_read_lock();1296 sta = __carl9170_get_tx_sta(ar, skb);1297 if (!sta)1298 goto out_rcu;1299 1300 sta_info = (void *) sta->drv_priv;1301 tx_info = IEEE80211_SKB_CB(skb);1302 1303 if (unlikely(sta_info->sleeping) &&1304 !(tx_info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |1305 IEEE80211_TX_CTL_CLEAR_PS_FILT))) {1306 rcu_read_unlock();1307 1308 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)1309 atomic_dec(&ar->tx_ampdu_upload);1310 1311 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;1312 carl9170_release_dev_space(ar, skb);1313 carl9170_tx_status(ar, skb, false);1314 return true;1315 }1316 1317out_rcu:1318 rcu_read_unlock();1319 return false;1320}1321 1322static void carl9170_bar_check(struct ar9170 *ar, struct sk_buff *skb)1323{1324 struct _carl9170_tx_superframe *super = (void *) skb->data;1325 struct ieee80211_bar *bar = (void *) super->frame_data;1326 1327 if (unlikely(ieee80211_is_back_req(bar->frame_control)) &&1328 skb->len >= sizeof(struct ieee80211_bar)) {1329 struct carl9170_bar_list_entry *entry;1330 unsigned int queue = skb_get_queue_mapping(skb);1331 1332 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);1333 if (!WARN_ON_ONCE(!entry)) {1334 entry->skb = skb;1335 spin_lock_bh(&ar->bar_list_lock[queue]);1336 list_add_tail_rcu(&entry->list, &ar->bar_list[queue]);1337 spin_unlock_bh(&ar->bar_list_lock[queue]);1338 }1339 }1340}1341 1342static void carl9170_tx(struct ar9170 *ar)1343{1344 struct sk_buff *skb;1345 unsigned int i, q;1346 bool schedule_garbagecollector = false;1347 1348 ar->tx_schedule = false;1349 1350 if (unlikely(!IS_STARTED(ar)))1351 return;1352 1353 carl9170_usb_handle_tx_err(ar);1354 1355 for (i = 0; i < ar->hw->queues; i++) {1356 while (!skb_queue_empty(&ar->tx_pending[i])) {1357 skb = carl9170_tx_pick_skb(ar, &ar->tx_pending[i]);1358 if (unlikely(!skb))1359 break;1360 1361 if (unlikely(carl9170_tx_ps_drop(ar, skb)))1362 continue;1363 1364 carl9170_bar_check(ar, skb);1365 1366 atomic_inc(&ar->tx_total_pending);1367 1368 q = __carl9170_get_queue(ar, i);1369 /*1370 * NB: tx_status[i] vs. tx_status[q],1371 * TODO: Move into pick_skb or alloc_dev_space.1372 */1373 skb_queue_tail(&ar->tx_status[q], skb);1374 1375 /*1376 * increase ref count to "2".1377 * Ref counting is the easiest way to solve the1378 * race between the urb's completion routine:1379 * carl9170_tx_callback1380 * and wlan tx status functions:1381 * carl9170_tx_status/janitor.1382 */1383 carl9170_tx_get_skb(skb);1384 1385 carl9170_usb_tx(ar, skb);1386 schedule_garbagecollector = true;1387 }1388 }1389 1390 if (!schedule_garbagecollector)1391 return;1392 1393 ieee80211_queue_delayed_work(ar->hw, &ar->tx_janitor,1394 msecs_to_jiffies(CARL9170_TX_TIMEOUT));1395}1396 1397static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,1398 struct ieee80211_sta *sta, struct sk_buff *skb,1399 struct ieee80211_tx_info *txinfo)1400{1401 struct carl9170_sta_info *sta_info;1402 struct carl9170_sta_tid *agg;1403 struct sk_buff *iter;1404 u16 tid, seq, qseq, off;1405 bool run = false;1406 1407 tid = carl9170_get_tid(skb);1408 seq = carl9170_get_seq(skb);1409 sta_info = (void *) sta->drv_priv;1410 1411 rcu_read_lock();1412 agg = rcu_dereference(sta_info->agg[tid]);1413 1414 if (!agg)1415 goto err_unlock_rcu;1416 1417 spin_lock_bh(&agg->lock);1418 if (unlikely(agg->state < CARL9170_TID_STATE_IDLE))1419 goto err_unlock;1420 1421 /* check if sequence is within the BA window */1422 if (unlikely(!BAW_WITHIN(agg->bsn, CARL9170_BAW_BITS, seq)))1423 goto err_unlock;1424 1425 if (WARN_ON_ONCE(!BAW_WITHIN(agg->snx, CARL9170_BAW_BITS, seq)))1426 goto err_unlock;1427 1428 off = SEQ_DIFF(seq, agg->bsn);1429 if (WARN_ON_ONCE(test_and_set_bit(off, agg->bitmap)))1430 goto err_unlock;1431 1432 if (likely(BAW_WITHIN(agg->hsn, CARL9170_BAW_BITS, seq))) {1433 __skb_queue_tail(&agg->queue, skb);1434 agg->hsn = seq;1435 goto queued;1436 }1437 1438 skb_queue_reverse_walk(&agg->queue, iter) {1439 qseq = carl9170_get_seq(iter);1440 1441 if (BAW_WITHIN(qseq, CARL9170_BAW_BITS, seq)) {1442 __skb_queue_after(&agg->queue, iter, skb);1443 goto queued;1444 }1445 }1446 1447 __skb_queue_head(&agg->queue, skb);1448queued:1449 1450 if (unlikely(agg->state != CARL9170_TID_STATE_XMIT)) {1451 if (agg->snx == carl9170_get_seq(skb_peek(&agg->queue))) {1452 agg->state = CARL9170_TID_STATE_XMIT;1453 run = true;1454 }1455 }1456 1457 spin_unlock_bh(&agg->lock);1458 rcu_read_unlock();1459 1460 return run;1461 1462err_unlock:1463 spin_unlock_bh(&agg->lock);1464 1465err_unlock_rcu:1466 rcu_read_unlock();1467 txinfo->flags &= ~IEEE80211_TX_CTL_AMPDU;1468 carl9170_tx_status(ar, skb, false);1469 ar->tx_dropped++;1470 return false;1471}1472 1473void carl9170_op_tx(struct ieee80211_hw *hw,1474 struct ieee80211_tx_control *control,1475 struct sk_buff *skb)1476{1477 struct ar9170 *ar = hw->priv;1478 struct ieee80211_tx_info *info;1479 struct ieee80211_sta *sta = control->sta;1480 struct ieee80211_vif *vif;1481 bool run;1482 1483 if (unlikely(!IS_STARTED(ar)))1484 goto err_free;1485 1486 info = IEEE80211_SKB_CB(skb);1487 vif = info->control.vif;1488 1489 if (unlikely(carl9170_tx_prepare(ar, sta, skb)))1490 goto err_free;1491 1492 carl9170_tx_accounting(ar, skb);1493 /*1494 * from now on, one has to use carl9170_tx_status to free1495 * all ressouces which are associated with the frame.1496 */1497 1498 if (sta) {1499 struct carl9170_sta_info *stai = (void *) sta->drv_priv;1500 atomic_inc(&stai->pending_frames);1501 }1502 1503 if (info->flags & IEEE80211_TX_CTL_AMPDU) {1504 /* to static code analyzers and reviewers:1505 * mac80211 guarantees that a valid "sta"1506 * reference is present, if a frame is to1507 * be part of an ampdu. Hence any extra1508 * sta == NULL checks are redundant in this1509 * special case.1510 */1511 run = carl9170_tx_ampdu_queue(ar, sta, skb, info);1512 if (run)1513 carl9170_tx_ampdu(ar);1514 1515 } else {1516 unsigned int queue = skb_get_queue_mapping(skb);1517 1518 carl9170_tx_get_rates(ar, vif, sta, skb);1519 carl9170_tx_apply_rateset(ar, info, skb);1520 skb_queue_tail(&ar->tx_pending[queue], skb);1521 }1522 1523 carl9170_tx(ar);1524 return;1525 1526err_free:1527 ar->tx_dropped++;1528 ieee80211_free_txskb(ar->hw, skb);1529}1530 1531void carl9170_tx_scheduler(struct ar9170 *ar)1532{1533 1534 if (ar->tx_ampdu_schedule)1535 carl9170_tx_ampdu(ar);1536 1537 if (ar->tx_schedule)1538 carl9170_tx(ar);1539}1540 1541/* caller has to take rcu_read_lock */1542static struct carl9170_vif_info *carl9170_pick_beaconing_vif(struct ar9170 *ar)1543{1544 struct carl9170_vif_info *cvif;1545 int i = 1;1546 1547 /* The AR9170 hardware has no fancy beacon queue or some1548 * other scheduling mechanism. So, the driver has to make1549 * due by setting the two beacon timers (pretbtt and tbtt)1550 * once and then swapping the beacon address in the HW's1551 * register file each time the pretbtt fires.1552 */1553 1554 cvif = rcu_dereference(ar->beacon_iter);1555 if (ar->vifs > 0 && cvif) {1556 do {1557 list_for_each_entry_continue_rcu(cvif, &ar->vif_list,1558 list) {1559 if (cvif->active && cvif->enable_beacon)1560 goto out;1561 }1562 } while (ar->beacon_enabled && i--);1563 1564 /* no entry found in list */1565 return NULL;1566 }1567 1568out:1569 RCU_INIT_POINTER(ar->beacon_iter, cvif);1570 return cvif;1571}1572 1573static bool carl9170_tx_beacon_physet(struct ar9170 *ar, struct sk_buff *skb,1574 u32 *ht1, u32 *plcp)1575{1576 struct ieee80211_tx_info *txinfo;1577 struct ieee80211_tx_rate *rate;1578 unsigned int power, chains;1579 bool ht_rate;1580 1581 txinfo = IEEE80211_SKB_CB(skb);1582 rate = &txinfo->control.rates[0];1583 ht_rate = !!(txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS);1584 carl9170_tx_rate_tpc_chains(ar, txinfo, rate, plcp, &power, &chains);1585 1586 *ht1 = AR9170_MAC_BCN_HT1_TX_ANT0;1587 if (chains == AR9170_TX_PHY_TXCHAIN_2)1588 *ht1 |= AR9170_MAC_BCN_HT1_TX_ANT1;1589 SET_VAL(AR9170_MAC_BCN_HT1_PWR_CTRL, *ht1, 7);1590 SET_VAL(AR9170_MAC_BCN_HT1_TPC, *ht1, power);1591 SET_VAL(AR9170_MAC_BCN_HT1_CHAIN_MASK, *ht1, chains);1592 1593 if (ht_rate) {1594 *ht1 |= AR9170_MAC_BCN_HT1_HT_EN;1595 if (rate->flags & IEEE80211_TX_RC_SHORT_GI)1596 *plcp |= AR9170_MAC_BCN_HT2_SGI;1597 1598 if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {1599 *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_SHARED;1600 *plcp |= AR9170_MAC_BCN_HT2_BW40;1601 } else if (rate->flags & IEEE80211_TX_RC_DUP_DATA) {1602 *ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_DUP;1603 *plcp |= AR9170_MAC_BCN_HT2_BW40;1604 }1605 1606 SET_VAL(AR9170_MAC_BCN_HT2_LEN, *plcp, skb->len + FCS_LEN);1607 } else {1608 if (*plcp <= AR9170_TX_PHY_RATE_CCK_11M)1609 *plcp |= ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400;1610 else1611 *plcp |= ((skb->len + FCS_LEN) << 16) + 0x0010;1612 }1613 1614 return ht_rate;1615}1616 1617int carl9170_update_beacon(struct ar9170 *ar, const bool submit)1618{1619 struct sk_buff *skb = NULL;1620 struct carl9170_vif_info *cvif;1621 __le32 *data, *old = NULL;1622 u32 word, ht1, plcp, off, addr, len;1623 int i = 0, err = 0;1624 bool ht_rate;1625 1626 rcu_read_lock();1627 cvif = carl9170_pick_beaconing_vif(ar);1628 if (!cvif)1629 goto out_unlock;1630 1631 skb = ieee80211_beacon_get_tim(ar->hw, carl9170_get_vif(cvif),1632 NULL, NULL, 0);1633 1634 if (!skb) {1635 err = -ENOMEM;1636 goto err_free;1637 }1638 1639 spin_lock_bh(&ar->beacon_lock);1640 data = (__le32 *)skb->data;1641 if (cvif->beacon)1642 old = (__le32 *)cvif->beacon->data;1643 1644 off = cvif->id * AR9170_MAC_BCN_LENGTH_MAX;1645 addr = ar->fw.beacon_addr + off;1646 len = roundup(skb->len + FCS_LEN, 4);1647 1648 if ((off + len) > ar->fw.beacon_max_len) {1649 if (net_ratelimit()) {1650 wiphy_err(ar->hw->wiphy, "beacon does not "1651 "fit into device memory!\n");1652 }1653 err = -EINVAL;1654 goto err_unlock;1655 }1656 1657 if (len > AR9170_MAC_BCN_LENGTH_MAX) {1658 if (net_ratelimit()) {1659 wiphy_err(ar->hw->wiphy, "no support for beacons "1660 "bigger than %d (yours:%d).\n",1661 AR9170_MAC_BCN_LENGTH_MAX, len);1662 }1663 1664 err = -EMSGSIZE;1665 goto err_unlock;1666 }1667 1668 ht_rate = carl9170_tx_beacon_physet(ar, skb, &ht1, &plcp);1669 1670 carl9170_async_regwrite_begin(ar);1671 carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT1, ht1);1672 if (ht_rate)1673 carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT2, plcp);1674 else1675 carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP, plcp);1676 1677 for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {1678 /*1679 * XXX: This accesses beyond skb data for up1680 * to the last 3 bytes!!1681 */1682 1683 if (old && (data[i] == old[i]))1684 continue;1685 1686 word = le32_to_cpu(data[i]);1687 carl9170_async_regwrite(addr + 4 * i, word);1688 }1689 carl9170_async_regwrite_finish();1690 1691 dev_kfree_skb_any(cvif->beacon);1692 cvif->beacon = NULL;1693 1694 err = carl9170_async_regwrite_result();1695 if (!err)1696 cvif->beacon = skb;1697 spin_unlock_bh(&ar->beacon_lock);1698 if (err)1699 goto err_free;1700 1701 if (submit) {1702 err = carl9170_bcn_ctrl(ar, cvif->id,1703 CARL9170_BCN_CTRL_CAB_TRIGGER,1704 addr, skb->len + FCS_LEN);1705 1706 if (err)1707 goto err_free;1708 }1709out_unlock:1710 rcu_read_unlock();1711 return 0;1712 1713err_unlock:1714 spin_unlock_bh(&ar->beacon_lock);1715 1716err_free:1717 rcu_read_unlock();1718 dev_kfree_skb_any(skb);1719 return err;1720}1721