1 /******************************************************************************
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of version 2 of the GNU General Public License as
13 * published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
25 * The full GNU General Public License is included in this distribution
26 * in the file called COPYING.
28 * Contact Information:
29 * Intel Linux Wireless <linuxwifi@intel.com>
30 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
34 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
35 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
36 * All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
42 * * Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * * Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in
46 * the documentation and/or other materials provided with the
48 * * Neither the name Intel Corporation nor the names of its
49 * contributors may be used to endorse or promote products derived
50 * from this software without specific prior written permission.
52 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
53 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
54 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
55 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
56 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
57 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
58 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
59 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
60 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
61 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
62 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64 *****************************************************************************/
65 #include <linux/ieee80211.h>
66 #include <linux/etherdevice.h>
67 #include <linux/tcp.h>
69 #include "iwl-trans.h"
70 #include "iwl-eeprom-parse.h"
76 iwl_mvm_bar_check_trigger(struct iwl_mvm *mvm, const u8 *addr,
79 struct iwl_fw_dbg_trigger_tlv *trig;
80 struct iwl_fw_dbg_trigger_ba *ba_trig;
82 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_BA))
85 trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_BA);
86 ba_trig = (void *)trig->data;
88 if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
91 if (!(le16_to_cpu(ba_trig->tx_bar) & BIT(tid)))
94 iwl_mvm_fw_dbg_collect_trig(mvm, trig,
95 "BAR sent to %pM, tid %d, ssn %d",
100 * Sets most of the Tx cmd's fields
102 void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
103 struct iwl_tx_cmd *tx_cmd,
104 struct ieee80211_tx_info *info, u8 sta_id)
106 struct ieee80211_hdr *hdr = (void *)skb->data;
107 __le16 fc = hdr->frame_control;
108 u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags);
109 u32 len = skb->len + FCS_LEN;
112 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
113 tx_flags |= TX_CMD_FLG_ACK;
115 tx_flags &= ~TX_CMD_FLG_ACK;
117 if (ieee80211_is_probe_resp(fc))
118 tx_flags |= TX_CMD_FLG_TSF;
120 if (ieee80211_has_morefrags(fc))
121 tx_flags |= TX_CMD_FLG_MORE_FRAG;
123 if (ieee80211_is_data_qos(fc)) {
124 u8 *qc = ieee80211_get_qos_ctl(hdr);
125 tx_cmd->tid_tspec = qc[0] & 0xf;
126 tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
127 } else if (ieee80211_is_back_req(fc)) {
128 struct ieee80211_bar *bar = (void *)skb->data;
129 u16 control = le16_to_cpu(bar->control);
130 u16 ssn = le16_to_cpu(bar->start_seq_num);
132 tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;
133 tx_cmd->tid_tspec = (control &
134 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
135 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
136 WARN_ON_ONCE(tx_cmd->tid_tspec >= IWL_MAX_TID_COUNT);
137 iwl_mvm_bar_check_trigger(mvm, bar->ra, tx_cmd->tid_tspec,
140 tx_cmd->tid_tspec = IWL_TID_NON_QOS;
141 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
142 tx_flags |= TX_CMD_FLG_SEQ_CTL;
144 tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
147 /* Default to 0 (BE) when tid_spec is set to IWL_TID_NON_QOS */
148 if (tx_cmd->tid_tspec < IWL_MAX_TID_COUNT)
149 ac = tid_to_mac80211_ac[tx_cmd->tid_tspec];
151 ac = tid_to_mac80211_ac[0];
153 tx_flags |= iwl_mvm_bt_coex_tx_prio(mvm, hdr, info, ac) <<
154 TX_CMD_FLG_BT_PRIO_POS;
156 if (ieee80211_is_mgmt(fc)) {
157 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
158 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_ASSOC);
159 else if (ieee80211_is_action(fc))
160 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
162 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
164 /* The spec allows Action frames in A-MPDU, we don't support
167 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
168 } else if (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
169 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
171 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
174 if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
175 !is_multicast_ether_addr(ieee80211_get_DA(hdr)))
176 tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
178 if (fw_has_capa(&mvm->fw->ucode_capa,
179 IWL_UCODE_TLV_CAPA_TXPOWER_INSERTION_SUPPORT) &&
180 ieee80211_action_contains_tpc(skb))
181 tx_flags |= TX_CMD_FLG_WRITE_TX_POWER;
183 tx_cmd->tx_flags = cpu_to_le32(tx_flags);
184 /* Total # bytes to be transmitted */
185 tx_cmd->len = cpu_to_le16((u16)skb->len);
186 tx_cmd->next_frame_len = 0;
187 tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
188 tx_cmd->sta_id = sta_id;
192 * Sets the fields in the Tx cmd that are rate related
194 void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm, struct iwl_tx_cmd *tx_cmd,
195 struct ieee80211_tx_info *info,
196 struct ieee80211_sta *sta, __le16 fc)
202 /* Set retry limit on RTS packets */
203 tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT;
205 /* Set retry limit on DATA packets and Probe Responses*/
206 if (ieee80211_is_probe_resp(fc)) {
207 tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT;
208 tx_cmd->rts_retry_limit =
209 min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit);
210 } else if (ieee80211_is_back_req(fc)) {
211 tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT;
213 tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY;
217 * for data packets, rate info comes from the table inside the fw. This
218 * table is controlled by LINK_QUALITY commands
221 if (ieee80211_is_data(fc) && sta) {
222 tx_cmd->initial_rate_index = 0;
223 tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
225 } else if (ieee80211_is_back_req(fc)) {
227 cpu_to_le32(TX_CMD_FLG_ACK | TX_CMD_FLG_BAR);
230 /* HT rate doesn't make sense for a non data frame */
231 WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
232 "Got an HT rate (flags:0x%x/mcs:%d) for a non data frame (fc:0x%x)\n",
233 info->control.rates[0].flags,
234 info->control.rates[0].idx,
237 rate_idx = info->control.rates[0].idx;
238 /* if the rate isn't a well known legacy rate, take the lowest one */
239 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY)
240 rate_idx = rate_lowest_index(
241 &mvm->nvm_data->bands[info->band], sta);
243 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
244 if (info->band == IEEE80211_BAND_5GHZ)
245 rate_idx += IWL_FIRST_OFDM_RATE;
247 /* For 2.4 GHZ band, check that there is no need to remap */
248 BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
250 /* Get PLCP rate for tx_cmd->rate_n_flags */
251 rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx);
253 mvm->mgmt_last_antenna_idx =
254 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
255 mvm->mgmt_last_antenna_idx);
257 if (info->band == IEEE80211_BAND_2GHZ &&
258 !iwl_mvm_bt_coex_is_shared_ant_avail(mvm))
259 rate_flags = mvm->cfg->non_shared_ant << RATE_MCS_ANT_POS;
262 BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;
264 /* Set CCK flag as needed */
265 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
266 rate_flags |= RATE_MCS_CCK_MSK;
268 /* Set the rate in the TX cmd */
269 tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags);
273 * Sets the fields in the Tx cmd that are crypto related
275 static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
276 struct ieee80211_tx_info *info,
277 struct iwl_tx_cmd *tx_cmd,
278 struct sk_buff *skb_frag,
281 struct ieee80211_key_conf *keyconf = info->control.hw_key;
282 u8 *crypto_hdr = skb_frag->data + hdrlen;
285 switch (keyconf->cipher) {
286 case WLAN_CIPHER_SUITE_CCMP:
287 case WLAN_CIPHER_SUITE_CCMP_256:
288 iwl_mvm_set_tx_cmd_ccmp(info, tx_cmd);
289 pn = atomic64_inc_return(&keyconf->tx_pn);
292 crypto_hdr[3] = 0x20 | (keyconf->keyidx << 6);
293 crypto_hdr[1] = pn >> 8;
294 crypto_hdr[4] = pn >> 16;
295 crypto_hdr[5] = pn >> 24;
296 crypto_hdr[6] = pn >> 32;
297 crypto_hdr[7] = pn >> 40;
300 case WLAN_CIPHER_SUITE_TKIP:
301 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
302 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
305 case WLAN_CIPHER_SUITE_WEP104:
306 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
308 case WLAN_CIPHER_SUITE_WEP40:
309 tx_cmd->sec_ctl |= TX_CMD_SEC_WEP |
310 ((keyconf->keyidx << TX_CMD_SEC_WEP_KEY_IDX_POS) &
311 TX_CMD_SEC_WEP_KEY_IDX_MSK);
313 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
316 tx_cmd->sec_ctl |= TX_CMD_SEC_EXT;
321 * Allocates and sets the Tx cmd the driver data pointers in the skb
323 static struct iwl_device_cmd *
324 iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
325 int hdrlen, struct ieee80211_sta *sta, u8 sta_id)
327 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
328 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
329 struct iwl_device_cmd *dev_cmd;
330 struct iwl_tx_cmd *tx_cmd;
332 dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans);
334 if (unlikely(!dev_cmd))
337 memset(dev_cmd, 0, sizeof(*dev_cmd));
338 dev_cmd->hdr.cmd = TX_CMD;
339 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
341 if (info->control.hw_key)
342 iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb, hdrlen);
344 iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id);
346 iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);
348 memset(&info->status, 0, sizeof(info->status));
349 memset(info->driver_data, 0, sizeof(info->driver_data));
351 info->driver_data[1] = dev_cmd;
356 int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
358 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
359 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
360 struct iwl_device_cmd *dev_cmd;
361 struct iwl_tx_cmd *tx_cmd;
363 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
365 if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU))
368 if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
369 (!info->control.vif ||
370 info->hw_queue != info->control.vif->cab_queue)))
374 * IWL_MVM_OFFCHANNEL_QUEUE is used for ROC packets that can be used
375 * in 2 different types of vifs, P2P & STATION. P2P uses the offchannel
376 * queue. STATION (HS2.0) uses the auxiliary context of the FW,
377 * and hence needs to be sent on the aux queue
379 if (IEEE80211_SKB_CB(skb)->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
380 info->control.vif->type == NL80211_IFTYPE_STATION)
381 IEEE80211_SKB_CB(skb)->hw_queue = mvm->aux_queue;
384 * If the interface on which the frame is sent is the P2P_DEVICE
385 * or an AP/GO interface use the broadcast station associated
386 * with it; otherwise if the interface is a managed interface
387 * use the AP station associated with it for multicast traffic
388 * (this is not possible for unicast packets as a TLDS discovery
389 * response are sent without a station entry); otherwise use the
392 sta_id = mvm->aux_sta.sta_id;
393 if (info->control.vif) {
394 struct iwl_mvm_vif *mvmvif =
395 iwl_mvm_vif_from_mac80211(info->control.vif);
397 if (info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
398 info->control.vif->type == NL80211_IFTYPE_AP)
399 sta_id = mvmvif->bcast_sta.sta_id;
400 else if (info->control.vif->type == NL80211_IFTYPE_STATION &&
401 is_multicast_ether_addr(hdr->addr1)) {
402 u8 ap_sta_id = ACCESS_ONCE(mvmvif->ap_sta_id);
404 if (ap_sta_id != IWL_MVM_STATION_COUNT)
409 IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, info->hw_queue);
411 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, hdrlen, NULL, sta_id);
415 /* From now on, we cannot access info->control */
416 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
418 /* Copy MAC header from skb into command buffer */
419 memcpy(tx_cmd->hdr, hdr, hdrlen);
421 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, info->hw_queue)) {
422 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
429 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb_gso,
430 struct ieee80211_sta *sta,
431 struct sk_buff_head *mpdus_skb)
433 struct sk_buff *tmp, *next;
434 char cb[sizeof(skb_gso->cb)];
436 memcpy(cb, skb_gso->cb, sizeof(cb));
437 next = skb_gso_segment(skb_gso, 0);
441 consume_skb(skb_gso);
446 memcpy(tmp->cb, cb, sizeof(tmp->cb));
451 __skb_queue_tail(mpdus_skb, tmp);
458 * Sets the fields in the Tx cmd that are crypto related
460 static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
461 struct ieee80211_sta *sta)
463 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
464 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
465 struct iwl_mvm_sta *mvmsta;
466 struct iwl_device_cmd *dev_cmd;
467 struct iwl_tx_cmd *tx_cmd;
470 u8 tid = IWL_MAX_TID_COUNT;
471 u8 txq_id = info->hw_queue;
472 bool is_data_qos = false, is_ampdu = false;
475 mvmsta = iwl_mvm_sta_from_mac80211(sta);
476 fc = hdr->frame_control;
477 hdrlen = ieee80211_hdrlen(fc);
479 if (WARN_ON_ONCE(!mvmsta))
482 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
485 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, hdrlen, sta, mvmsta->sta_id);
489 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
490 /* From now on, we cannot access info->control */
493 * we handle that entirely ourselves -- for uAPSD the firmware
494 * will always send a notification, and for PS-Poll responses
495 * we'll notify mac80211 when getting frame status
497 info->flags &= ~IEEE80211_TX_STATUS_EOSP;
499 spin_lock(&mvmsta->lock);
501 if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
503 qc = ieee80211_get_qos_ctl(hdr);
504 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
505 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
506 goto drop_unlock_sta;
508 seq_number = mvmsta->tid_data[tid].seq_number;
509 seq_number &= IEEE80211_SCTL_SEQ;
510 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
511 hdr->seq_ctrl |= cpu_to_le16(seq_number);
513 is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
516 /* Copy MAC header from skb into command buffer */
517 memcpy(tx_cmd->hdr, hdr, hdrlen);
519 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
522 /* default to TID 0 for non-QoS packets */
523 u8 tdls_tid = tid == IWL_MAX_TID_COUNT ? 0 : tid;
525 txq_id = mvmsta->hw_queue[tid_to_mac80211_ac[tdls_tid]];
529 if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON))
530 goto drop_unlock_sta;
531 txq_id = mvmsta->tid_data[tid].txq_id;
534 IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
535 tid, txq_id, IEEE80211_SEQ_TO_SN(seq_number));
537 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
538 goto drop_unlock_sta;
540 if (is_data_qos && !ieee80211_has_morefrags(fc))
541 mvmsta->tid_data[tid].seq_number = seq_number + 0x10;
543 spin_unlock(&mvmsta->lock);
545 if (txq_id < mvm->first_agg_queue)
546 atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);
551 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
552 spin_unlock(&mvmsta->lock);
557 int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
558 struct ieee80211_sta *sta)
560 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
561 struct sk_buff_head mpdus_skbs;
562 unsigned int payload_len;
565 if (WARN_ON_ONCE(!mvmsta))
568 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
571 if (!skb_is_gso(skb))
572 return iwl_mvm_tx_mpdu(mvm, skb, sta);
574 payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
575 tcp_hdrlen(skb) + skb->data_len;
577 if (payload_len <= skb_shinfo(skb)->gso_size)
578 return iwl_mvm_tx_mpdu(mvm, skb, sta);
580 __skb_queue_head_init(&mpdus_skbs);
582 ret = iwl_mvm_tx_tso(mvm, skb, sta, &mpdus_skbs);
586 if (WARN_ON(skb_queue_empty(&mpdus_skbs)))
589 while (!skb_queue_empty(&mpdus_skbs)) {
590 struct sk_buff *skb = __skb_dequeue(&mpdus_skbs);
592 ret = iwl_mvm_tx_mpdu(mvm, skb, sta);
594 __skb_queue_purge(&mpdus_skbs);
602 static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
603 struct ieee80211_sta *sta, u8 tid)
605 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
606 struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
607 struct ieee80211_vif *vif = mvmsta->vif;
609 lockdep_assert_held(&mvmsta->lock);
611 if ((tid_data->state == IWL_AGG_ON ||
612 tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) &&
613 iwl_mvm_tid_queued(tid_data) == 0) {
615 * Now that this aggregation queue is empty tell mac80211 so it
616 * knows we no longer have frames buffered for the station on
617 * this TID (for the TIM bitmap calculation.)
619 ieee80211_sta_set_buffered(sta, tid, false);
622 if (tid_data->ssn != tid_data->next_reclaimed)
625 switch (tid_data->state) {
626 case IWL_EMPTYING_HW_QUEUE_ADDBA:
627 IWL_DEBUG_TX_QUEUES(mvm,
628 "Can continue addBA flow ssn = next_recl = %d\n",
629 tid_data->next_reclaimed);
630 tid_data->state = IWL_AGG_STARTING;
631 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
634 case IWL_EMPTYING_HW_QUEUE_DELBA:
635 IWL_DEBUG_TX_QUEUES(mvm,
636 "Can continue DELBA flow ssn = next_recl = %d\n",
637 tid_data->next_reclaimed);
638 iwl_mvm_disable_txq(mvm, tid_data->txq_id,
639 vif->hw_queue[tid_to_mac80211_ac[tid]], tid,
641 tid_data->state = IWL_AGG_OFF;
642 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
650 #ifdef CONFIG_IWLWIFI_DEBUG
651 const char *iwl_mvm_get_tx_fail_reason(u32 status)
653 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
654 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
656 switch (status & TX_STATUS_MSK) {
657 case TX_STATUS_SUCCESS:
659 TX_STATUS_POSTPONE(DELAY);
660 TX_STATUS_POSTPONE(FEW_BYTES);
661 TX_STATUS_POSTPONE(BT_PRIO);
662 TX_STATUS_POSTPONE(QUIET_PERIOD);
663 TX_STATUS_POSTPONE(CALC_TTAK);
664 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
665 TX_STATUS_FAIL(SHORT_LIMIT);
666 TX_STATUS_FAIL(LONG_LIMIT);
667 TX_STATUS_FAIL(UNDERRUN);
668 TX_STATUS_FAIL(DRAIN_FLOW);
669 TX_STATUS_FAIL(RFKILL_FLUSH);
670 TX_STATUS_FAIL(LIFE_EXPIRE);
671 TX_STATUS_FAIL(DEST_PS);
672 TX_STATUS_FAIL(HOST_ABORTED);
673 TX_STATUS_FAIL(BT_RETRY);
674 TX_STATUS_FAIL(STA_INVALID);
675 TX_STATUS_FAIL(FRAG_DROPPED);
676 TX_STATUS_FAIL(TID_DISABLE);
677 TX_STATUS_FAIL(FIFO_FLUSHED);
678 TX_STATUS_FAIL(SMALL_CF_POLL);
679 TX_STATUS_FAIL(FW_DROP);
680 TX_STATUS_FAIL(STA_COLOR_MISMATCH);
685 #undef TX_STATUS_FAIL
686 #undef TX_STATUS_POSTPONE
688 #endif /* CONFIG_IWLWIFI_DEBUG */
690 void iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,
691 enum ieee80211_band band,
692 struct ieee80211_tx_rate *r)
694 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
695 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
696 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
697 case RATE_MCS_CHAN_WIDTH_20:
699 case RATE_MCS_CHAN_WIDTH_40:
700 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
702 case RATE_MCS_CHAN_WIDTH_80:
703 r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
705 case RATE_MCS_CHAN_WIDTH_160:
706 r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
709 if (rate_n_flags & RATE_MCS_SGI_MSK)
710 r->flags |= IEEE80211_TX_RC_SHORT_GI;
711 if (rate_n_flags & RATE_MCS_HT_MSK) {
712 r->flags |= IEEE80211_TX_RC_MCS;
713 r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
714 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
715 ieee80211_rate_set_vht(
716 r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
717 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
718 RATE_VHT_MCS_NSS_POS) + 1);
719 r->flags |= IEEE80211_TX_RC_VHT_MCS;
721 r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
727 * translate ucode response to mac80211 tx status control values
729 static void iwl_mvm_hwrate_to_tx_status(u32 rate_n_flags,
730 struct ieee80211_tx_info *info)
732 struct ieee80211_tx_rate *r = &info->status.rates[0];
734 info->status.antenna =
735 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
736 iwl_mvm_hwrate_to_tx_rate(rate_n_flags, info->band, r);
739 static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
740 struct iwl_rx_packet *pkt)
742 struct ieee80211_sta *sta;
743 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
744 int txq_id = SEQ_TO_QUEUE(sequence);
745 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
746 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
747 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
748 u32 status = le16_to_cpu(tx_resp->status.status);
749 u16 ssn = iwl_mvm_get_scd_ssn(tx_resp);
750 struct iwl_mvm_sta *mvmsta;
751 struct sk_buff_head skbs;
753 u16 next_reclaimed, seq_ctl;
755 __skb_queue_head_init(&skbs);
757 seq_ctl = le16_to_cpu(tx_resp->seq_ctl);
759 /* we can free until ssn % q.n_bd not inclusive */
760 iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);
762 while (!skb_queue_empty(&skbs)) {
763 struct sk_buff *skb = __skb_dequeue(&skbs);
764 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
768 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
770 memset(&info->status, 0, sizeof(info->status));
772 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
774 /* inform mac80211 about what happened with the frame */
775 switch (status & TX_STATUS_MSK) {
776 case TX_STATUS_SUCCESS:
777 case TX_STATUS_DIRECT_DONE:
778 info->flags |= IEEE80211_TX_STAT_ACK;
780 case TX_STATUS_FAIL_DEST_PS:
781 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
787 info->status.rates[0].count = tx_resp->failure_frame + 1;
788 iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate),
790 info->status.status_driver_data[1] =
791 (void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate);
793 /* Single frame failure in an AMPDU queue => send BAR */
794 if (txq_id >= mvm->first_agg_queue &&
795 !(info->flags & IEEE80211_TX_STAT_ACK) &&
796 !(info->flags & IEEE80211_TX_STAT_TX_FILTERED))
797 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
799 /* W/A FW bug: seq_ctl is wrong when the status isn't success */
800 if (status != TX_STATUS_SUCCESS) {
801 struct ieee80211_hdr *hdr = (void *)skb->data;
802 seq_ctl = le16_to_cpu(hdr->seq_ctrl);
806 * TODO: this is not accurate if we are freeing more than one
809 info->status.tx_time =
810 le16_to_cpu(tx_resp->wireless_media_time);
811 BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
812 info->status.status_driver_data[0] =
813 (void *)(uintptr_t)tx_resp->reduced_tpc;
815 ieee80211_tx_status(mvm->hw, skb);
818 if (txq_id >= mvm->first_agg_queue) {
819 /* If this is an aggregation queue, we use the ssn since:
820 * ssn = wifi seq_num % 256.
821 * The seq_ctl is the sequence control of the packet to which
822 * this Tx response relates. But if there is a hole in the
823 * bitmap of the BA we received, this Tx response may allow to
824 * reclaim the hole and all the subsequent packets that were
825 * already acked. In that case, seq_ctl != ssn, and the next
826 * packet to be reclaimed will be ssn and not seq_ctl. In that
827 * case, several packets will be reclaimed even if
830 * The ssn is the index (% 256) of the latest packet that has
831 * treated (acked / dropped) + 1.
833 next_reclaimed = ssn;
835 /* The next packet to be reclaimed is the one after this one */
836 next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
839 IWL_DEBUG_TX_REPLY(mvm,
840 "TXQ %d status %s (0x%08x)\n",
841 txq_id, iwl_mvm_get_tx_fail_reason(status), status);
843 IWL_DEBUG_TX_REPLY(mvm,
844 "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
845 le32_to_cpu(tx_resp->initial_rate),
846 tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
847 ssn, next_reclaimed, seq_ctl);
851 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
853 * sta can't be NULL otherwise it'd mean that the sta has been freed in
854 * the firmware while we still have packets for it in the Tx queues.
856 if (WARN_ON_ONCE(!sta))
860 mvmsta = iwl_mvm_sta_from_mac80211(sta);
862 if (tid != IWL_TID_NON_QOS) {
863 struct iwl_mvm_tid_data *tid_data =
864 &mvmsta->tid_data[tid];
865 bool send_eosp_ndp = false;
867 spin_lock_bh(&mvmsta->lock);
868 tid_data->next_reclaimed = next_reclaimed;
869 IWL_DEBUG_TX_REPLY(mvm, "Next reclaimed packet:%d\n",
871 iwl_mvm_check_ratid_empty(mvm, sta, tid);
873 if (mvmsta->sleep_tx_count) {
874 mvmsta->sleep_tx_count--;
875 if (mvmsta->sleep_tx_count &&
876 !iwl_mvm_tid_queued(tid_data)) {
878 * The number of frames in the queue
879 * dropped to 0 even if we sent less
880 * frames than we thought we had on the
882 * This means we had holes in the BA
883 * window that we just filled, ask
884 * mac80211 to send EOSP since the
885 * firmware won't know how to do that.
886 * Send NDP and the firmware will send
887 * EOSP notification that will trigger
888 * a call to ieee80211_sta_eosp().
890 send_eosp_ndp = true;
894 spin_unlock_bh(&mvmsta->lock);
896 iwl_mvm_sta_modify_sleep_tx_count(mvm, sta,
897 IEEE80211_FRAME_RELEASE_UAPSD,
898 1, tid, false, false);
899 mvmsta->sleep_tx_count = 0;
900 ieee80211_send_eosp_nullfunc(sta, tid);
904 if (mvmsta->next_status_eosp) {
905 mvmsta->next_status_eosp = false;
906 ieee80211_sta_eosp(sta);
913 * If the txq is not an AMPDU queue, there is no chance we freed
914 * several skbs. Check that out...
916 if (txq_id >= mvm->first_agg_queue)
919 /* We can't free more than one frame at once on a shared queue */
920 WARN_ON(skb_freed > 1);
922 /* If we have still frames for this STA nothing to do here */
923 if (!atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id]))
926 if (mvmsta && mvmsta->vif->type == NL80211_IFTYPE_AP) {
929 * If there are no pending frames for this STA and
930 * the tx to this station is not disabled, notify
931 * mac80211 that this station can now wake up in its
933 * If mvmsta is not NULL, sta is valid.
936 spin_lock_bh(&mvmsta->lock);
938 if (!mvmsta->disable_tx)
939 ieee80211_sta_block_awake(mvm->hw, sta, false);
941 spin_unlock_bh(&mvmsta->lock);
944 if (PTR_ERR(sta) == -EBUSY || PTR_ERR(sta) == -ENOENT) {
946 * We are draining and this was the last packet - pre_rcu_remove
947 * has been called already. We might be after the
948 * synchronize_net already.
949 * Don't rely on iwl_mvm_rm_sta to see the empty Tx queues.
951 set_bit(sta_id, mvm->sta_drained);
952 schedule_work(&mvm->sta_drained_wk);
959 #ifdef CONFIG_IWLWIFI_DEBUG
960 #define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
961 static const char *iwl_get_agg_tx_status(u16 status)
963 switch (status & AGG_TX_STATE_STATUS_MSK) {
964 AGG_TX_STATE_(TRANSMITTED);
965 AGG_TX_STATE_(UNDERRUN);
966 AGG_TX_STATE_(BT_PRIO);
967 AGG_TX_STATE_(FEW_BYTES);
968 AGG_TX_STATE_(ABORT);
969 AGG_TX_STATE_(LAST_SENT_TTL);
970 AGG_TX_STATE_(LAST_SENT_TRY_CNT);
971 AGG_TX_STATE_(LAST_SENT_BT_KILL);
972 AGG_TX_STATE_(SCD_QUERY);
973 AGG_TX_STATE_(TEST_BAD_CRC32);
974 AGG_TX_STATE_(RESPONSE);
975 AGG_TX_STATE_(DUMP_TX);
976 AGG_TX_STATE_(DELAY_TX);
982 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
983 struct iwl_rx_packet *pkt)
985 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
986 struct agg_tx_status *frame_status = &tx_resp->status;
989 for (i = 0; i < tx_resp->frame_count; i++) {
990 u16 fstatus = le16_to_cpu(frame_status[i].status);
992 IWL_DEBUG_TX_REPLY(mvm,
993 "status %s (0x%04x), try-count (%d) seq (0x%x)\n",
994 iwl_get_agg_tx_status(fstatus),
995 fstatus & AGG_TX_STATE_STATUS_MSK,
996 (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
997 AGG_TX_STATE_TRY_CNT_POS,
998 le16_to_cpu(frame_status[i].sequence));
1002 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
1003 struct iwl_rx_packet *pkt)
1005 #endif /* CONFIG_IWLWIFI_DEBUG */
1007 static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
1008 struct iwl_rx_packet *pkt)
1010 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1011 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
1012 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
1013 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1014 struct ieee80211_sta *sta;
1016 if (WARN_ON_ONCE(SEQ_TO_QUEUE(sequence) < mvm->first_agg_queue))
1019 if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
1022 iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);
1026 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1028 if (!WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
1029 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1030 mvmsta->tid_data[tid].rate_n_flags =
1031 le32_to_cpu(tx_resp->initial_rate);
1032 mvmsta->tid_data[tid].reduced_tpc = tx_resp->reduced_tpc;
1033 mvmsta->tid_data[tid].tx_time =
1034 le16_to_cpu(tx_resp->wireless_media_time);
1040 void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1042 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1043 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1045 if (tx_resp->frame_count == 1)
1046 iwl_mvm_rx_tx_cmd_single(mvm, pkt);
1048 iwl_mvm_rx_tx_cmd_agg(mvm, pkt);
1051 static void iwl_mvm_tx_info_from_ba_notif(struct ieee80211_tx_info *info,
1052 struct iwl_mvm_ba_notif *ba_notif,
1053 struct iwl_mvm_tid_data *tid_data)
1055 info->flags |= IEEE80211_TX_STAT_AMPDU;
1056 info->status.ampdu_ack_len = ba_notif->txed_2_done;
1057 info->status.ampdu_len = ba_notif->txed;
1058 iwl_mvm_hwrate_to_tx_status(tid_data->rate_n_flags,
1060 /* TODO: not accounted if the whole A-MPDU failed */
1061 info->status.tx_time = tid_data->tx_time;
1062 info->status.status_driver_data[0] =
1063 (void *)(uintptr_t)tid_data->reduced_tpc;
1064 info->status.status_driver_data[1] =
1065 (void *)(uintptr_t)tid_data->rate_n_flags;
1068 void iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1070 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1071 struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data;
1072 struct sk_buff_head reclaimed_skbs;
1073 struct iwl_mvm_tid_data *tid_data;
1074 struct ieee80211_sta *sta;
1075 struct iwl_mvm_sta *mvmsta;
1076 struct sk_buff *skb;
1077 int sta_id, tid, freed;
1078 /* "flow" corresponds to Tx queue */
1079 u16 scd_flow = le16_to_cpu(ba_notif->scd_flow);
1080 /* "ssn" is start of block-ack Tx window, corresponds to index
1081 * (in Tx queue's circular buffer) of first TFD/frame in window */
1082 u16 ba_resp_scd_ssn = le16_to_cpu(ba_notif->scd_ssn);
1084 sta_id = ba_notif->sta_id;
1085 tid = ba_notif->tid;
1087 if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT ||
1088 tid >= IWL_MAX_TID_COUNT,
1089 "sta_id %d tid %d", sta_id, tid))
1094 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1096 /* Reclaiming frames for a station that has been deleted ? */
1097 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
1102 mvmsta = iwl_mvm_sta_from_mac80211(sta);
1103 tid_data = &mvmsta->tid_data[tid];
1105 if (tid_data->txq_id != scd_flow) {
1107 "invalid BA notification: Q %d, tid %d, flow %d\n",
1108 tid_data->txq_id, tid, scd_flow);
1113 spin_lock_bh(&mvmsta->lock);
1115 __skb_queue_head_init(&reclaimed_skbs);
1118 * Release all TFDs before the SSN, i.e. all TFDs in front of
1119 * block-ack window (we assume that they've been successfully
1120 * transmitted ... if not, it's too late anyway).
1122 iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn,
1125 IWL_DEBUG_TX_REPLY(mvm,
1126 "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
1127 (u8 *)&ba_notif->sta_addr_lo32,
1129 IWL_DEBUG_TX_REPLY(mvm,
1130 "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
1131 ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
1132 (unsigned long long)le64_to_cpu(ba_notif->bitmap),
1133 scd_flow, ba_resp_scd_ssn, ba_notif->txed,
1134 ba_notif->txed_2_done);
1136 tid_data->next_reclaimed = ba_resp_scd_ssn;
1138 iwl_mvm_check_ratid_empty(mvm, sta, tid);
1142 skb_queue_walk(&reclaimed_skbs, skb) {
1143 struct ieee80211_hdr *hdr = (void *)skb->data;
1144 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1146 if (ieee80211_is_data_qos(hdr->frame_control))
1151 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
1153 memset(&info->status, 0, sizeof(info->status));
1154 /* Packet was transmitted successfully, failures come as single
1155 * frames because before failing a frame the firmware transmits
1156 * it without aggregation at least once.
1158 info->flags |= IEEE80211_TX_STAT_ACK;
1160 /* this is the first skb we deliver in this batch */
1161 /* put the rate scaling data there */
1163 iwl_mvm_tx_info_from_ba_notif(info, ba_notif, tid_data);
1166 spin_unlock_bh(&mvmsta->lock);
1168 /* We got a BA notif with 0 acked or scd_ssn didn't progress which is
1169 * possible (i.e. first MPDU in the aggregation wasn't acked)
1170 * Still it's important to update RS about sent vs. acked.
1172 if (skb_queue_empty(&reclaimed_skbs)) {
1173 struct ieee80211_tx_info ba_info = {};
1174 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
1178 rcu_dereference(mvmsta->vif->chanctx_conf);
1180 if (WARN_ON_ONCE(!chanctx_conf))
1183 ba_info.band = chanctx_conf->def.chan->band;
1184 iwl_mvm_tx_info_from_ba_notif(&ba_info, ba_notif, tid_data);
1186 IWL_DEBUG_TX_REPLY(mvm, "No reclaim. Update rs directly\n");
1187 iwl_mvm_rs_tx_status(mvm, sta, tid, &ba_info);
1193 while (!skb_queue_empty(&reclaimed_skbs)) {
1194 skb = __skb_dequeue(&reclaimed_skbs);
1195 ieee80211_tx_status(mvm->hw, skb);
1200 * Note that there are transports that buffer frames before they reach
1201 * the firmware. This means that after flush_tx_path is called, the
1202 * queue might not be empty. The race-free way to handle this is to:
1203 * 1) set the station as draining
1204 * 2) flush the Tx path
1205 * 3) wait for the transport queues to be empty
1207 int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, u32 flags)
1210 struct iwl_tx_path_flush_cmd flush_cmd = {
1211 .queues_ctl = cpu_to_le32(tfd_msk),
1212 .flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
1215 ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags,
1216 sizeof(flush_cmd), &flush_cmd);
1218 IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);