drivers/staging/wfx/data_tx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Datapath implementation.
   4  *
   5  * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
   6  * Copyright (c) 2010, ST-Ericsson
   7  */
   8 #include <net/mac80211.h>
   9 #include <linux/etherdevice.h>
  10
  11 #include "data_tx.h"
  12 #include "wfx.h"
  13 #include "bh.h"
  14 #include "sta.h"
  15 #include "queue.h"
  16 #include "debug.h"
  17 #include "traces.h"
  18 #include "hif_tx_mib.h"
  19
  20 static int wfx_get_hw_rate(struct wfx_dev *wdev,
  21                            const struct ieee80211_tx_rate *rate)
  22 {
  23         struct ieee80211_supported_band *band;
  24
  25         if (rate->idx < 0)
  26                 return -1;
  27         if (rate->flags & IEEE80211_TX_RC_MCS) {
  28                 if (rate->idx > 7) {
  29                         WARN(1, "wrong rate->idx value: %d", rate->idx);
  30                         return -1;
  31                 }
  32                 return rate->idx + 14;
  33         }
  34         // WFx only support 2GHz, else band information should be retrieved
  35         // from ieee80211_tx_info
  36         band = wdev->hw->wiphy->bands[NL80211_BAND_2GHZ];
  37         if (rate->idx >= band->n_bitrates) {
  38                 WARN(1, "wrong rate->idx value: %d", rate->idx);
  39                 return -1;
  40         }
  41         return band->bitrates[rate->idx].hw_value;
  42 }
  43
  44 /* TX policy cache implementation */
  45
  46 static void wfx_tx_policy_build(struct wfx_vif *wvif, struct tx_policy *policy,
  47                                 struct ieee80211_tx_rate *rates)
  48 {
  49         struct wfx_dev *wdev = wvif->wdev;
  50         int i, rateid;
  51         u8 count;
  52
  53         WARN(rates[0].idx < 0, "invalid rate policy");
  54         memset(policy, 0, sizeof(*policy));
  55         for (i = 0; i < IEEE80211_TX_MAX_RATES; ++i) {
  56                 if (rates[i].idx < 0)
  57                         break;
  58                 WARN_ON(rates[i].count > 15);
  59                 rateid = wfx_get_hw_rate(wdev, &rates[i]);
  60                 // Pack two values in each byte of policy->rates
  61                 count = rates[i].count;
  62                 if (rateid % 2)
  63                         count <<= 4;
  64                 policy->rates[rateid / 2] |= count;
  65         }
  66 }
  67
  68 static bool tx_policy_is_equal(const struct tx_policy *a,
  69                                const struct tx_policy *b)
  70 {
  71         return !memcmp(a->rates, b->rates, sizeof(a->rates));
  72 }
  73
  74 static int wfx_tx_policy_find(struct tx_policy_cache *cache,
  75                               struct tx_policy *wanted)
  76 {
  77         struct tx_policy *it;
  78
  79         list_for_each_entry(it, &cache->used, link)
  80                 if (tx_policy_is_equal(wanted, it))
  81                         return it - cache->cache;
  82         list_for_each_entry(it, &cache->free, link)
  83                 if (tx_policy_is_equal(wanted, it))
  84                         return it - cache->cache;
  85         return -1;
  86 }
  87
  88 static void wfx_tx_policy_use(struct tx_policy_cache *cache,
  89                               struct tx_policy *entry)
  90 {
  91         ++entry->usage_count;
  92         list_move(&entry->link, &cache->used);
  93 }
  94
  95 static int wfx_tx_policy_release(struct tx_policy_cache *cache,
  96                                  struct tx_policy *entry)
  97 {
  98         int ret = --entry->usage_count;
  99
 100         if (!ret)
 101                 list_move(&entry->link, &cache->free);
 102         return ret;
 103 }
 104
 105 static int wfx_tx_policy_get(struct wfx_vif *wvif,
 106                              struct ieee80211_tx_rate *rates, bool *renew)
 107 {
 108         int idx;
 109         struct tx_policy_cache *cache = &wvif->tx_policy_cache;
 110         struct tx_policy wanted;
 111
 112         wfx_tx_policy_build(wvif, &wanted, rates);
 113
 114         spin_lock_bh(&cache->lock);
 115         if (list_empty(&cache->free)) {
 116                 WARN(1, "unable to get a valid Tx policy");
 117                 spin_unlock_bh(&cache->lock);
 118                 return HIF_TX_RETRY_POLICY_INVALID;
 119         }
 120         idx = wfx_tx_policy_find(cache, &wanted);
 121         if (idx >= 0) {
 122                 *renew = false;
 123         } else {
 124                 struct tx_policy *entry;
 125                 *renew = true;
 126                 /* If policy is not found create a new one
 127                  * using the oldest entry in "free" list
 128                  */
 129                 entry = list_entry(cache->free.prev, struct tx_policy, link);
 130                 memcpy(entry->rates, wanted.rates, sizeof(entry->rates));
 131                 entry->uploaded = false;
 132                 entry->usage_count = 0;
 133                 idx = entry - cache->cache;
 134         }
 135         wfx_tx_policy_use(cache, &cache->cache[idx]);
 136         if (list_empty(&cache->free))
 137                 ieee80211_stop_queues(wvif->wdev->hw);
 138         spin_unlock_bh(&cache->lock);
 139         return idx;
 140 }
 141
 142 static void wfx_tx_policy_put(struct wfx_vif *wvif, int idx)
 143 {
 144         int usage, locked;
 145         struct tx_policy_cache *cache = &wvif->tx_policy_cache;
 146
 147         if (idx == HIF_TX_RETRY_POLICY_INVALID)
 148                 return;
 149         spin_lock_bh(&cache->lock);
 150         locked = list_empty(&cache->free);
 151         usage = wfx_tx_policy_release(cache, &cache->cache[idx]);
 152         if (locked && !usage)
 153                 ieee80211_wake_queues(wvif->wdev->hw);
 154         spin_unlock_bh(&cache->lock);
 155 }
 156
 157 static int wfx_tx_policy_upload(struct wfx_vif *wvif)
 158 {
 159         struct tx_policy *policies = wvif->tx_policy_cache.cache;
 160         u8 tmp_rates[12];
 161         int i, is_used;
 162
 163         do {
 164                 spin_lock_bh(&wvif->tx_policy_cache.lock);
 165                 for (i = 0; i < ARRAY_SIZE(wvif->tx_policy_cache.cache); ++i) {
 166                         is_used = memzcmp(policies[i].rates,
 167                                           sizeof(policies[i].rates));
 168                         if (!policies[i].uploaded && is_used)
 169                                 break;
 170                 }
 171                 if (i < ARRAY_SIZE(wvif->tx_policy_cache.cache)) {
 172                         policies[i].uploaded = true;
 173                         memcpy(tmp_rates, policies[i].rates, sizeof(tmp_rates));
 174                         spin_unlock_bh(&wvif->tx_policy_cache.lock);
 175                         hif_set_tx_rate_retry_policy(wvif, i, tmp_rates);
 176                 } else {
 177                         spin_unlock_bh(&wvif->tx_policy_cache.lock);
 178                 }
 179         } while (i < ARRAY_SIZE(wvif->tx_policy_cache.cache));
 180         return 0;
 181 }
 182
 183 void wfx_tx_policy_upload_work(struct work_struct *work)
 184 {
 185         struct wfx_vif *wvif =
 186                 container_of(work, struct wfx_vif, tx_policy_upload_work);
 187
 188         wfx_tx_policy_upload(wvif);
 189         wfx_tx_unlock(wvif->wdev);
 190 }
 191
 192 void wfx_tx_policy_init(struct wfx_vif *wvif)
 193 {
 194         struct tx_policy_cache *cache = &wvif->tx_policy_cache;
 195         int i;
 196
 197         memset(cache, 0, sizeof(*cache));
 198
 199         spin_lock_init(&cache->lock);
 200         INIT_LIST_HEAD(&cache->used);
 201         INIT_LIST_HEAD(&cache->free);
 202
 203         for (i = 0; i < ARRAY_SIZE(cache->cache); ++i)
 204                 list_add(&cache->cache[i].link, &cache->free);
 205 }
 206
 207 /* Tx implementation */
 208
 209 static bool ieee80211_is_action_back(struct ieee80211_hdr *hdr)
 210 {
 211         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)hdr;
 212
 213         if (!ieee80211_is_action(mgmt->frame_control))
 214                 return false;
 215         if (mgmt->u.action.category != WLAN_CATEGORY_BACK)
 216                 return false;
 217         return true;
 218 }
 219
 220 static u8 wfx_tx_get_link_id(struct wfx_vif *wvif, struct ieee80211_sta *sta,
 221                              struct ieee80211_hdr *hdr)
 222 {
 223         struct wfx_sta_priv *sta_priv =
 224                 sta ? (struct wfx_sta_priv *)&sta->drv_priv : NULL;
 225         const u8 *da = ieee80211_get_DA(hdr);
 226
 227         if (sta_priv && sta_priv->link_id)
 228                 return sta_priv->link_id;
 229         if (wvif->vif->type != NL80211_IFTYPE_AP)
 230                 return 0;
 231         if (is_multicast_ether_addr(da))
 232                 return 0;
 233         return HIF_LINK_ID_NOT_ASSOCIATED;
 234 }
 235
 236 static void wfx_tx_fixup_rates(struct ieee80211_tx_rate *rates)
 237 {
 238         int i;
 239         bool finished;
 240
 241         // Firmware is not able to mix rates with different flags
 242         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 243                 if (rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 244                         rates[i].flags |= IEEE80211_TX_RC_SHORT_GI;
 245                 if (!(rates[0].flags & IEEE80211_TX_RC_SHORT_GI))
 246                         rates[i].flags &= ~IEEE80211_TX_RC_SHORT_GI;
 247                 if (!(rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS))
 248                         rates[i].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
 249         }
 250
 251         // Sort rates and remove duplicates
 252         do {
 253                 finished = true;
 254                 for (i = 0; i < IEEE80211_TX_MAX_RATES - 1; i++) {
 255                         if (rates[i + 1].idx == rates[i].idx &&
 256                             rates[i].idx != -1) {
 257                                 rates[i].count += rates[i + 1].count;
 258                                 if (rates[i].count > 15)
 259                                         rates[i].count = 15;
 260                                 rates[i + 1].idx = -1;
 261                                 rates[i + 1].count = 0;
 262
 263                                 finished = false;
 264                         }
 265                         if (rates[i + 1].idx > rates[i].idx) {
 266                                 swap(rates[i + 1], rates[i]);
 267                                 finished = false;
 268                         }
 269                 }
 270         } while (!finished);
 271         // Ensure that MCS0 or 1Mbps is present at the end of the retry list
 272         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 273                 if (rates[i].idx == 0)
 274                         break;
 275                 if (rates[i].idx == -1) {
 276                         rates[i].idx = 0;
 277                         rates[i].count = 8; // == hw->max_rate_tries
 278                         rates[i].flags = rates[i - 1].flags &
 279                                          IEEE80211_TX_RC_MCS;
 280                         break;
 281                 }
 282         }
 283         // All retries use long GI
 284         for (i = 1; i < IEEE80211_TX_MAX_RATES; i++)
 285                 rates[i].flags &= ~IEEE80211_TX_RC_SHORT_GI;
 286 }
 287
 288 static u8 wfx_tx_get_rate_id(struct wfx_vif *wvif,
 289                              struct ieee80211_tx_info *tx_info)
 290 {
 291         bool tx_policy_renew = false;
 292         u8 rate_id;
 293
 294         rate_id = wfx_tx_policy_get(wvif,
 295                                     tx_info->driver_rates, &tx_policy_renew);
 296         if (rate_id == HIF_TX_RETRY_POLICY_INVALID)
 297                 dev_warn(wvif->wdev->dev, "unable to get a valid Tx policy");
 298
 299         if (tx_policy_renew) {
 300                 wfx_tx_lock(wvif->wdev);
 301                 if (!schedule_work(&wvif->tx_policy_upload_work))
 302                         wfx_tx_unlock(wvif->wdev);
 303         }
 304         return rate_id;
 305 }
 306
 307 static int wfx_tx_get_frame_format(struct ieee80211_tx_info *tx_info)
 308 {
 309         if (!(tx_info->driver_rates[0].flags & IEEE80211_TX_RC_MCS))
 310                 return HIF_FRAME_FORMAT_NON_HT;
 311         else if (!(tx_info->driver_rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD))
 312                 return HIF_FRAME_FORMAT_MIXED_FORMAT_HT;
 313         else
 314                 return HIF_FRAME_FORMAT_GF_HT_11N;
 315 }
 316
 317 static int wfx_tx_get_icv_len(struct ieee80211_key_conf *hw_key)
 318 {
 319         int mic_space;
 320
 321         if (!hw_key)
 322                 return 0;
 323         if (hw_key->cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 324                 return 0;
 325         mic_space = (hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) ? 8 : 0;
 326         return hw_key->icv_len + mic_space;
 327 }
 328
 329 static int wfx_tx_inner(struct wfx_vif *wvif, struct ieee80211_sta *sta,
 330                         struct sk_buff *skb)
 331 {
 332         struct hif_msg *hif_msg;
 333         struct hif_req_tx *req;
 334         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 335         struct ieee80211_key_conf *hw_key = tx_info->control.hw_key;
 336         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 337         int queue_id = skb_get_queue_mapping(skb);
 338         size_t offset = (size_t)skb->data & 3;
 339         int wmsg_len = sizeof(struct hif_msg) +
 340                         sizeof(struct hif_req_tx) + offset;
 341
 342         WARN(queue_id >= IEEE80211_NUM_ACS, "unsupported queue_id");
 343         wfx_tx_fixup_rates(tx_info->driver_rates);
 344
 345         // From now tx_info->control is unusable
 346         memset(tx_info->rate_driver_data, 0, sizeof(struct wfx_tx_priv));
 347
 348         // Fill hif_msg
 349         WARN(skb_headroom(skb) < wmsg_len, "not enough space in skb");
 350         WARN(offset & 1, "attempt to transmit an unaligned frame");
 351         skb_put(skb, wfx_tx_get_icv_len(hw_key));
 352         skb_push(skb, wmsg_len);
 353         memset(skb->data, 0, wmsg_len);
 354         hif_msg = (struct hif_msg *)skb->data;
 355         hif_msg->len = cpu_to_le16(skb->len);
 356         hif_msg->id = HIF_REQ_ID_TX;
 357         hif_msg->interface = wvif->id;
 358         if (skb->len > wvif->wdev->hw_caps.size_inp_ch_buf) {
 359                 dev_warn(wvif->wdev->dev,
 360                          "requested frame size (%d) is larger than maximum supported (%d)\n",
 361                          skb->len, wvif->wdev->hw_caps.size_inp_ch_buf);
 362                 skb_pull(skb, wmsg_len);
 363                 return -EIO;
 364         }
 365
 366         // Fill tx request
 367         req = (struct hif_req_tx *)hif_msg->body;
 368         // packet_id just need to be unique on device. 32bits are more than
 369         // necessary for that task, so we tae advantage of it to add some extra
 370         // data for debug.
 371         req->packet_id = atomic_add_return(1, &wvif->wdev->packet_id) & 0xFFFF;
 372         req->packet_id |= IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl)) << 16;
 373         req->packet_id |= queue_id << 28;
 374
 375         req->fc_offset = offset;
 376         if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM)
 377                 req->after_dtim = 1;
 378         req->peer_sta_id = wfx_tx_get_link_id(wvif, sta, hdr);
 379         // Queue index are inverted between firmware and Linux
 380         req->queue_id = 3 - queue_id;
 381         req->retry_policy_index = wfx_tx_get_rate_id(wvif, tx_info);
 382         req->frame_format = wfx_tx_get_frame_format(tx_info);
 383         if (tx_info->driver_rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 384                 req->short_gi = 1;
 385
 386         // Auxiliary operations
 387         wfx_tx_queues_put(wvif, skb);
 388         if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM)
 389                 schedule_work(&wvif->update_tim_work);
 390         wfx_bh_request_tx(wvif->wdev);
 391         return 0;
 392 }
 393
 394 void wfx_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control,
 395             struct sk_buff *skb)
 396 {
 397         struct wfx_dev *wdev = hw->priv;
 398         struct wfx_vif *wvif;
 399         struct ieee80211_sta *sta = control ? control->sta : NULL;
 400         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 401         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 402         size_t driver_data_room = sizeof_field(struct ieee80211_tx_info,
 403                                                rate_driver_data);
 404
 405         compiletime_assert(sizeof(struct wfx_tx_priv) <= driver_data_room,
 406                            "struct tx_priv is too large");
 407         WARN(skb->next || skb->prev, "skb is already member of a list");
 408         // control.vif can be NULL for injected frames
 409         if (tx_info->control.vif)
 410                 wvif = (struct wfx_vif *)tx_info->control.vif->drv_priv;
 411         else
 412                 wvif = wvif_iterate(wdev, NULL);
 413         if (WARN_ON(!wvif))
 414                 goto drop;
 415         // Because of TX_AMPDU_SETUP_IN_HW, mac80211 does not try to send any
 416         // BlockAck session management frame. The check below exist just in case.
 417         if (ieee80211_is_action_back(hdr)) {
 418                 dev_info(wdev->dev, "drop BA action\n");
 419                 goto drop;
 420         }
 421         if (wfx_tx_inner(wvif, sta, skb))
 422                 goto drop;
 423
 424         return;
 425
 426 drop:
 427         ieee80211_tx_status_irqsafe(wdev->hw, skb);
 428 }
 429
 430 static void wfx_skb_dtor(struct wfx_vif *wvif, struct sk_buff *skb)
 431 {
 432         struct hif_msg *hif = (struct hif_msg *)skb->data;
 433         struct hif_req_tx *req = (struct hif_req_tx *)hif->body;
 434         unsigned int offset = sizeof(struct hif_msg) +
 435                               sizeof(struct hif_req_tx) +
 436                               req->fc_offset;
 437
 438         if (!wvif) {
 439                 pr_warn("%s: vif associated with the skb does not exist anymore\n", __func__);
 440                 return;
 441         }
 442         wfx_tx_policy_put(wvif, req->retry_policy_index);
 443         skb_pull(skb, offset);
 444         ieee80211_tx_status_irqsafe(wvif->wdev->hw, skb);
 445 }
 446
 447 static void wfx_tx_fill_rates(struct wfx_dev *wdev,
 448                               struct ieee80211_tx_info *tx_info,
 449                               const struct hif_cnf_tx *arg)
 450 {
 451         struct ieee80211_tx_rate *rate;
 452         int tx_count;
 453         int i;
 454
 455         tx_count = arg->ack_failures;
 456         if (!arg->status || arg->ack_failures)
 457                 tx_count += 1; // Also report success
 458         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 459                 rate = &tx_info->status.rates[i];
 460                 if (rate->idx < 0)
 461                         break;
 462                 if (tx_count < rate->count &&
 463                     arg->status == HIF_STATUS_TX_FAIL_RETRIES &&
 464                     arg->ack_failures)
 465                         dev_dbg(wdev->dev, "all retries were not consumed: %d != %d\n",
 466                                 rate->count, tx_count);
 467                 if (tx_count <= rate->count && tx_count &&
 468                     arg->txed_rate != wfx_get_hw_rate(wdev, rate))
 469                         dev_dbg(wdev->dev, "inconsistent tx_info rates: %d != %d\n",
 470                                 arg->txed_rate, wfx_get_hw_rate(wdev, rate));
 471                 if (tx_count > rate->count) {
 472                         tx_count -= rate->count;
 473                 } else if (!tx_count) {
 474                         rate->count = 0;
 475                         rate->idx = -1;
 476                 } else {
 477                         rate->count = tx_count;
 478                         tx_count = 0;
 479                 }
 480         }
 481         if (tx_count)
 482                 dev_dbg(wdev->dev, "%d more retries than expected\n", tx_count);
 483 }
 484
 485 void wfx_tx_confirm_cb(struct wfx_dev *wdev, const struct hif_cnf_tx *arg)
 486 {
 487         struct ieee80211_tx_info *tx_info;
 488         struct wfx_vif *wvif;
 489         struct sk_buff *skb;
 490
 491         skb = wfx_pending_get(wdev, arg->packet_id);
 492         if (!skb) {
 493                 dev_warn(wdev->dev, "received unknown packet_id (%#.8x) from chip\n",
 494                          arg->packet_id);
 495                 return;
 496         }
 497         tx_info = IEEE80211_SKB_CB(skb);
 498         wvif = wdev_to_wvif(wdev, ((struct hif_msg *)skb->data)->interface);
 499         WARN_ON(!wvif);
 500         if (!wvif)
 501                 return;
 502
 503         // Note that wfx_pending_get_pkt_us_delay() get data from tx_info
 504         _trace_tx_stats(arg, skb, wfx_pending_get_pkt_us_delay(wdev, skb));
 505         wfx_tx_fill_rates(wdev, tx_info, arg);
 506         // From now, you can touch to tx_info->status, but do not touch to
 507         // tx_priv anymore
 508         // FIXME: use ieee80211_tx_info_clear_status()
 509         memset(tx_info->rate_driver_data, 0, sizeof(tx_info->rate_driver_data));
 510         memset(tx_info->pad, 0, sizeof(tx_info->pad));
 511
 512         if (!arg->status) {
 513                 tx_info->status.tx_time =
 514                         le32_to_cpu(arg->media_delay) -
 515                         le32_to_cpu(arg->tx_queue_delay);
 516                 if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
 517                         tx_info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
 518                 else
 519                         tx_info->flags |= IEEE80211_TX_STAT_ACK;
 520         } else if (arg->status == HIF_STATUS_TX_FAIL_REQUEUE) {
 521                 WARN(!arg->requeue, "incoherent status and result_flags");
 522                 if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
 523                         wvif->after_dtim_tx_allowed = false; // DTIM period elapsed
 524                         schedule_work(&wvif->update_tim_work);
 525                 }
 526                 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 527         }
 528         wfx_skb_dtor(wvif, skb);
 529 }
 530
 531 static void wfx_flush_vif(struct wfx_vif *wvif, u32 queues,
 532                           struct sk_buff_head *dropped)
 533 {
 534         struct wfx_queue *queue;
 535         int i;
 536
 537         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 538                 if (!(BIT(i) & queues))
 539                         continue;
 540                 queue = &wvif->tx_queue[i];
 541                 if (dropped)
 542                         wfx_tx_queue_drop(wvif, queue, dropped);
 543         }
 544         if (wvif->wdev->chip_frozen)
 545                 return;
 546         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 547                 if (!(BIT(i) & queues))
 548                         continue;
 549                 queue = &wvif->tx_queue[i];
 550                 if (wait_event_timeout(wvif->wdev->tx_dequeue,
 551                                        wfx_tx_queue_empty(wvif, queue),
 552                                        msecs_to_jiffies(1000)) <= 0)
 553                         dev_warn(wvif->wdev->dev,
 554                                  "frames queued while flushing tx queues?");
 555         }
 556 }
 557
 558 void wfx_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 559                u32 queues, bool drop)
 560 {
 561         struct wfx_dev *wdev = hw->priv;
 562         struct sk_buff_head dropped;
 563         struct wfx_vif *wvif;
 564         struct hif_msg *hif;
 565         struct sk_buff *skb;
 566
 567         skb_queue_head_init(&dropped);
 568         if (vif) {
 569                 wvif = (struct wfx_vif *)vif->drv_priv;
 570                 wfx_flush_vif(wvif, queues, drop ? &dropped : NULL);
 571         } else {
 572                 wvif = NULL;
 573                 while ((wvif = wvif_iterate(wdev, wvif)) != NULL)
 574                         wfx_flush_vif(wvif, queues, drop ? &dropped : NULL);
 575         }
 576         wfx_tx_flush(wdev);
 577         if (wdev->chip_frozen)
 578                 wfx_pending_drop(wdev, &dropped);
 579         while ((skb = skb_dequeue(&dropped)) != NULL) {
 580                 hif = (struct hif_msg *)skb->data;
 581                 wvif = wdev_to_wvif(wdev, hif->interface);
 582                 ieee80211_tx_info_clear_status(IEEE80211_SKB_CB(skb));
 583                 wfx_skb_dtor(wvif, skb);
 584         }
 585 }