1 /******************************************************************************
2  *
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.
5  *
6  * GPL LICENSE SUMMARY
7  *
8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
10  *
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.
14  *
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.
19  *
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,
23  * USA
24  *
25  * The full GNU General Public License is included in this distribution
26  * in the file called COPYING.
27  *
28  * Contact Information:
29  *  Intel Linux Wireless <ilw@linux.intel.com>
30  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
31  *
32  * BSD LICENSE
33  *
34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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37  *
38  * Redistribution and use in source and binary forms, with or without
39  * modification, are permitted provided that the following conditions
40  * are met:
41  *
42  *  * Redistributions of source code must retain the above copyright
43  *    notice, this list of conditions and the following disclaimer.
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46  *    the documentation and/or other materials provided with the
47  *    distribution.
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49  *    contributors may be used to endorse or promote products derived
50  *    from this software without specific prior written permission.
51  *
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
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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.
63  *
64  *****************************************************************************/
65 #include <linux/ieee80211.h>
66 #include <linux/etherdevice.h>
67 
68 #include "iwl-trans.h"
69 #include "iwl-eeprom-parse.h"
70 #include "mvm.h"
71 #include "sta.h"
72 
73 /*
74  * Sets most of the Tx cmd's fields
75  */
iwl_mvm_set_tx_cmd(struct iwl_mvm * mvm,struct sk_buff * skb,struct iwl_tx_cmd * tx_cmd,struct ieee80211_tx_info * info,u8 sta_id)76 void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
77 			struct iwl_tx_cmd *tx_cmd,
78 			struct ieee80211_tx_info *info, u8 sta_id)
79 {
80 	struct ieee80211_hdr *hdr = (void *)skb->data;
81 	__le16 fc = hdr->frame_control;
82 	u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags);
83 	u32 len = skb->len + FCS_LEN;
84 	u8 ac;
85 
86 	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
87 		tx_flags |= TX_CMD_FLG_ACK;
88 	else
89 		tx_flags &= ~TX_CMD_FLG_ACK;
90 
91 	if (ieee80211_is_probe_resp(fc))
92 		tx_flags |= TX_CMD_FLG_TSF;
93 
94 	if (ieee80211_has_morefrags(fc))
95 		tx_flags |= TX_CMD_FLG_MORE_FRAG;
96 
97 	if (ieee80211_is_data_qos(fc)) {
98 		u8 *qc = ieee80211_get_qos_ctl(hdr);
99 		tx_cmd->tid_tspec = qc[0] & 0xf;
100 		tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
101 	} else if (ieee80211_is_back_req(fc)) {
102 		struct ieee80211_bar *bar = (void *)skb->data;
103 		u16 control = le16_to_cpu(bar->control);
104 
105 		tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;
106 		tx_cmd->tid_tspec = (control &
107 				     IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
108 			IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
109 		WARN_ON_ONCE(tx_cmd->tid_tspec >= IWL_MAX_TID_COUNT);
110 	} else {
111 		tx_cmd->tid_tspec = IWL_TID_NON_QOS;
112 		if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
113 			tx_flags |= TX_CMD_FLG_SEQ_CTL;
114 		else
115 			tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
116 	}
117 
118 	/* Default to 0 (BE) when tid_spec is set to IWL_TID_NON_QOS */
119 	if (tx_cmd->tid_tspec < IWL_MAX_TID_COUNT)
120 		ac = tid_to_mac80211_ac[tx_cmd->tid_tspec];
121 	else
122 		ac = tid_to_mac80211_ac[0];
123 
124 	tx_flags |= iwl_mvm_bt_coex_tx_prio(mvm, hdr, info, ac) <<
125 			TX_CMD_FLG_BT_PRIO_POS;
126 
127 	if (ieee80211_is_mgmt(fc)) {
128 		if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
129 			tx_cmd->pm_frame_timeout = cpu_to_le16(3);
130 		else
131 			tx_cmd->pm_frame_timeout = cpu_to_le16(2);
132 
133 		/* The spec allows Action frames in A-MPDU, we don't support
134 		 * it
135 		 */
136 		WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
137 	} else if (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
138 		tx_cmd->pm_frame_timeout = cpu_to_le16(2);
139 	} else {
140 		tx_cmd->pm_frame_timeout = 0;
141 	}
142 
143 	if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
144 	    !is_multicast_ether_addr(ieee80211_get_DA(hdr)))
145 		tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
146 
147 	if ((mvm->fw->ucode_capa.capa[0] &
148 	     IWL_UCODE_TLV_CAPA_TXPOWER_INSERTION_SUPPORT) &&
149 	    ieee80211_action_contains_tpc(skb))
150 		tx_flags |= TX_CMD_FLG_WRITE_TX_POWER;
151 
152 	tx_cmd->tx_flags = cpu_to_le32(tx_flags);
153 	/* Total # bytes to be transmitted */
154 	tx_cmd->len = cpu_to_le16((u16)skb->len);
155 	tx_cmd->next_frame_len = 0;
156 	tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
157 	tx_cmd->sta_id = sta_id;
158 }
159 
160 /*
161  * Sets the fields in the Tx cmd that are rate related
162  */
iwl_mvm_set_tx_cmd_rate(struct iwl_mvm * mvm,struct iwl_tx_cmd * tx_cmd,struct ieee80211_tx_info * info,struct ieee80211_sta * sta,__le16 fc)163 void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm, struct iwl_tx_cmd *tx_cmd,
164 			    struct ieee80211_tx_info *info,
165 			    struct ieee80211_sta *sta, __le16 fc)
166 {
167 	u32 rate_flags;
168 	int rate_idx;
169 	u8 rate_plcp;
170 
171 	/* Set retry limit on RTS packets */
172 	tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT;
173 
174 	/* Set retry limit on DATA packets and Probe Responses*/
175 	if (ieee80211_is_probe_resp(fc)) {
176 		tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT;
177 		tx_cmd->rts_retry_limit =
178 			min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit);
179 	} else if (ieee80211_is_back_req(fc)) {
180 		tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT;
181 	} else {
182 		tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY;
183 	}
184 
185 	/*
186 	 * for data packets, rate info comes from the table inside the fw. This
187 	 * table is controlled by LINK_QUALITY commands
188 	 */
189 
190 	if (ieee80211_is_data(fc) && sta) {
191 		tx_cmd->initial_rate_index = 0;
192 		tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
193 		return;
194 	} else if (ieee80211_is_back_req(fc)) {
195 		tx_cmd->tx_flags |=
196 			cpu_to_le32(TX_CMD_FLG_ACK | TX_CMD_FLG_BAR);
197 	}
198 
199 	/* HT rate doesn't make sense for a non data frame */
200 	WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
201 		  "Got an HT rate (flags:0x%x/mcs:%d) for a non data frame (fc:0x%x)\n",
202 		  info->control.rates[0].flags,
203 		  info->control.rates[0].idx,
204 		  le16_to_cpu(fc));
205 
206 	rate_idx = info->control.rates[0].idx;
207 	/* if the rate isn't a well known legacy rate, take the lowest one */
208 	if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY)
209 		rate_idx = rate_lowest_index(
210 				&mvm->nvm_data->bands[info->band], sta);
211 
212 	/* For 5 GHZ band, remap mac80211 rate indices into driver indices */
213 	if (info->band == IEEE80211_BAND_5GHZ)
214 		rate_idx += IWL_FIRST_OFDM_RATE;
215 
216 	/* For 2.4 GHZ band, check that there is no need to remap */
217 	BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
218 
219 	/* Get PLCP rate for tx_cmd->rate_n_flags */
220 	rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx);
221 
222 	mvm->mgmt_last_antenna_idx =
223 		iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
224 				     mvm->mgmt_last_antenna_idx);
225 
226 	if (info->band == IEEE80211_BAND_2GHZ &&
227 	    !iwl_mvm_bt_coex_is_shared_ant_avail(mvm))
228 		rate_flags = mvm->cfg->non_shared_ant << RATE_MCS_ANT_POS;
229 	else
230 		rate_flags =
231 			BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;
232 
233 	/* Set CCK flag as needed */
234 	if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
235 		rate_flags |= RATE_MCS_CCK_MSK;
236 
237 	/* Set the rate in the TX cmd */
238 	tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags);
239 }
240 
241 /*
242  * Sets the fields in the Tx cmd that are crypto related
243  */
iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm * mvm,struct ieee80211_tx_info * info,struct iwl_tx_cmd * tx_cmd,struct sk_buff * skb_frag)244 void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
245 			       struct ieee80211_tx_info *info,
246 			       struct iwl_tx_cmd *tx_cmd,
247 			       struct sk_buff *skb_frag)
248 {
249 	struct ieee80211_key_conf *keyconf = info->control.hw_key;
250 
251 	switch (keyconf->cipher) {
252 	case WLAN_CIPHER_SUITE_CCMP:
253 		tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
254 		memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
255 		if (info->flags & IEEE80211_TX_CTL_AMPDU)
256 			tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_CCMP_AGG);
257 		break;
258 
259 	case WLAN_CIPHER_SUITE_TKIP:
260 		tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
261 		ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
262 		break;
263 
264 	case WLAN_CIPHER_SUITE_WEP104:
265 		tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
266 		/* fall through */
267 	case WLAN_CIPHER_SUITE_WEP40:
268 		tx_cmd->sec_ctl |= TX_CMD_SEC_WEP |
269 			((keyconf->keyidx << TX_CMD_SEC_WEP_KEY_IDX_POS) &
270 			  TX_CMD_SEC_WEP_KEY_IDX_MSK);
271 
272 		memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
273 		break;
274 	default:
275 		tx_cmd->sec_ctl |= TX_CMD_SEC_EXT;
276 	}
277 }
278 
279 /*
280  * Allocates and sets the Tx cmd the driver data pointers in the skb
281  */
282 static struct iwl_device_cmd *
iwl_mvm_set_tx_params(struct iwl_mvm * mvm,struct sk_buff * skb,struct ieee80211_sta * sta,u8 sta_id)283 iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
284 		      struct ieee80211_sta *sta, u8 sta_id)
285 {
286 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
287 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
288 	struct iwl_device_cmd *dev_cmd;
289 	struct iwl_tx_cmd *tx_cmd;
290 
291 	dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans);
292 
293 	if (unlikely(!dev_cmd))
294 		return NULL;
295 
296 	memset(dev_cmd, 0, sizeof(*dev_cmd));
297 	dev_cmd->hdr.cmd = TX_CMD;
298 	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
299 
300 	if (info->control.hw_key)
301 		iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb);
302 
303 	iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id);
304 
305 	iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);
306 
307 	memset(&info->status, 0, sizeof(info->status));
308 
309 	info->driver_data[0] = NULL;
310 	info->driver_data[1] = dev_cmd;
311 
312 	return dev_cmd;
313 }
314 
iwl_mvm_tx_skb_non_sta(struct iwl_mvm * mvm,struct sk_buff * skb)315 int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
316 {
317 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
318 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
319 	struct iwl_device_cmd *dev_cmd;
320 	struct iwl_tx_cmd *tx_cmd;
321 	u8 sta_id;
322 
323 	if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU))
324 		return -1;
325 
326 	if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
327 			 (!info->control.vif ||
328 			  info->hw_queue != info->control.vif->cab_queue)))
329 		return -1;
330 
331 	/*
332 	 * IWL_MVM_OFFCHANNEL_QUEUE is used for ROC packets that can be used
333 	 * in 2 different types of vifs, P2P & STATION. P2P uses the offchannel
334 	 * queue. STATION (HS2.0) uses the auxiliary context of the FW,
335 	 * and hence needs to be sent on the aux queue
336 	 */
337 	if (IEEE80211_SKB_CB(skb)->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
338 	    info->control.vif->type == NL80211_IFTYPE_STATION)
339 		IEEE80211_SKB_CB(skb)->hw_queue = mvm->aux_queue;
340 
341 	/*
342 	 * If the interface on which frame is sent is the P2P_DEVICE
343 	 * or an AP/GO interface use the broadcast station associated
344 	 * with it; otherwise use the AUX station.
345 	 */
346 	if (info->control.vif &&
347 	    (info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
348 	     info->control.vif->type == NL80211_IFTYPE_AP)) {
349 		struct iwl_mvm_vif *mvmvif =
350 			iwl_mvm_vif_from_mac80211(info->control.vif);
351 		sta_id = mvmvif->bcast_sta.sta_id;
352 	} else {
353 		sta_id = mvm->aux_sta.sta_id;
354 	}
355 
356 	IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, info->hw_queue);
357 
358 	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, NULL, sta_id);
359 	if (!dev_cmd)
360 		return -1;
361 
362 	/* From now on, we cannot access info->control */
363 	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
364 
365 	/* Copy MAC header from skb into command buffer */
366 	memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(hdr->frame_control));
367 
368 	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, info->hw_queue)) {
369 		iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
370 		return -1;
371 	}
372 
373 	/*
374 	 * Increase the pending frames counter, so that later when a reply comes
375 	 * in and the counter is decreased - we don't start getting negative
376 	 * values.
377 	 * Note that we don't need to make sure it isn't agg'd, since we're
378 	 * TXing non-sta
379 	 */
380 	atomic_inc(&mvm->pending_frames[sta_id]);
381 
382 	return 0;
383 }
384 
385 /*
386  * Sets the fields in the Tx cmd that are crypto related
387  */
iwl_mvm_tx_skb(struct iwl_mvm * mvm,struct sk_buff * skb,struct ieee80211_sta * sta)388 int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
389 		   struct ieee80211_sta *sta)
390 {
391 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
392 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
393 	struct iwl_mvm_sta *mvmsta;
394 	struct iwl_device_cmd *dev_cmd;
395 	struct iwl_tx_cmd *tx_cmd;
396 	__le16 fc;
397 	u16 seq_number = 0;
398 	u8 tid = IWL_MAX_TID_COUNT;
399 	u8 txq_id = info->hw_queue;
400 	bool is_data_qos = false, is_ampdu = false;
401 
402 	mvmsta = iwl_mvm_sta_from_mac80211(sta);
403 	fc = hdr->frame_control;
404 
405 	if (WARN_ON_ONCE(!mvmsta))
406 		return -1;
407 
408 	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
409 		return -1;
410 
411 	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, sta, mvmsta->sta_id);
412 	if (!dev_cmd)
413 		goto drop;
414 
415 	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
416 	/* From now on, we cannot access info->control */
417 
418 	/*
419 	 * we handle that entirely ourselves -- for uAPSD the firmware
420 	 * will always send a notification, and for PS-Poll responses
421 	 * we'll notify mac80211 when getting frame status
422 	 */
423 	info->flags &= ~IEEE80211_TX_STATUS_EOSP;
424 
425 	spin_lock(&mvmsta->lock);
426 
427 	if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
428 		u8 *qc = NULL;
429 		qc = ieee80211_get_qos_ctl(hdr);
430 		tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
431 		if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
432 			goto drop_unlock_sta;
433 
434 		seq_number = mvmsta->tid_data[tid].seq_number;
435 		seq_number &= IEEE80211_SCTL_SEQ;
436 		hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
437 		hdr->seq_ctrl |= cpu_to_le16(seq_number);
438 		is_data_qos = true;
439 		is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
440 	}
441 
442 	/* Copy MAC header from skb into command buffer */
443 	memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(fc));
444 
445 	WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
446 
447 	if (sta->tdls) {
448 		/* default to TID 0 for non-QoS packets */
449 		u8 tdls_tid = tid == IWL_MAX_TID_COUNT ? 0 : tid;
450 
451 		txq_id = mvmsta->hw_queue[tid_to_mac80211_ac[tdls_tid]];
452 	}
453 
454 	if (is_ampdu) {
455 		if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON))
456 			goto drop_unlock_sta;
457 		txq_id = mvmsta->tid_data[tid].txq_id;
458 	}
459 
460 	IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
461 		     tid, txq_id, IEEE80211_SEQ_TO_SN(seq_number));
462 
463 	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
464 		goto drop_unlock_sta;
465 
466 	if (is_data_qos && !ieee80211_has_morefrags(fc))
467 		mvmsta->tid_data[tid].seq_number = seq_number + 0x10;
468 
469 	spin_unlock(&mvmsta->lock);
470 
471 	if (txq_id < mvm->first_agg_queue)
472 		atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);
473 
474 	return 0;
475 
476 drop_unlock_sta:
477 	iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
478 	spin_unlock(&mvmsta->lock);
479 drop:
480 	return -1;
481 }
482 
iwl_mvm_check_ratid_empty(struct iwl_mvm * mvm,struct ieee80211_sta * sta,u8 tid)483 static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
484 				      struct ieee80211_sta *sta, u8 tid)
485 {
486 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
487 	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
488 	struct ieee80211_vif *vif = mvmsta->vif;
489 
490 	lockdep_assert_held(&mvmsta->lock);
491 
492 	if ((tid_data->state == IWL_AGG_ON ||
493 	     tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) &&
494 	    iwl_mvm_tid_queued(tid_data) == 0) {
495 		/*
496 		 * Now that this aggregation queue is empty tell mac80211 so it
497 		 * knows we no longer have frames buffered for the station on
498 		 * this TID (for the TIM bitmap calculation.)
499 		 */
500 		ieee80211_sta_set_buffered(sta, tid, false);
501 	}
502 
503 	if (tid_data->ssn != tid_data->next_reclaimed)
504 		return;
505 
506 	switch (tid_data->state) {
507 	case IWL_EMPTYING_HW_QUEUE_ADDBA:
508 		IWL_DEBUG_TX_QUEUES(mvm,
509 				    "Can continue addBA flow ssn = next_recl = %d\n",
510 				    tid_data->next_reclaimed);
511 		tid_data->state = IWL_AGG_STARTING;
512 		ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
513 		break;
514 
515 	case IWL_EMPTYING_HW_QUEUE_DELBA:
516 		IWL_DEBUG_TX_QUEUES(mvm,
517 				    "Can continue DELBA flow ssn = next_recl = %d\n",
518 				    tid_data->next_reclaimed);
519 		iwl_mvm_disable_txq(mvm, tid_data->txq_id, CMD_ASYNC);
520 		tid_data->state = IWL_AGG_OFF;
521 		/*
522 		 * we can't hold the mutex - but since we are after a sequence
523 		 * point (call to iwl_mvm_disable_txq(), so we don't even need
524 		 * a memory barrier.
525 		 */
526 		mvm->queue_to_mac80211[tid_data->txq_id] =
527 					IWL_INVALID_MAC80211_QUEUE;
528 		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
529 		break;
530 
531 	default:
532 		break;
533 	}
534 }
535 
536 #ifdef CONFIG_IWLWIFI_DEBUG
iwl_mvm_get_tx_fail_reason(u32 status)537 const char *iwl_mvm_get_tx_fail_reason(u32 status)
538 {
539 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
540 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
541 
542 	switch (status & TX_STATUS_MSK) {
543 	case TX_STATUS_SUCCESS:
544 		return "SUCCESS";
545 	TX_STATUS_POSTPONE(DELAY);
546 	TX_STATUS_POSTPONE(FEW_BYTES);
547 	TX_STATUS_POSTPONE(BT_PRIO);
548 	TX_STATUS_POSTPONE(QUIET_PERIOD);
549 	TX_STATUS_POSTPONE(CALC_TTAK);
550 	TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
551 	TX_STATUS_FAIL(SHORT_LIMIT);
552 	TX_STATUS_FAIL(LONG_LIMIT);
553 	TX_STATUS_FAIL(UNDERRUN);
554 	TX_STATUS_FAIL(DRAIN_FLOW);
555 	TX_STATUS_FAIL(RFKILL_FLUSH);
556 	TX_STATUS_FAIL(LIFE_EXPIRE);
557 	TX_STATUS_FAIL(DEST_PS);
558 	TX_STATUS_FAIL(HOST_ABORTED);
559 	TX_STATUS_FAIL(BT_RETRY);
560 	TX_STATUS_FAIL(STA_INVALID);
561 	TX_STATUS_FAIL(FRAG_DROPPED);
562 	TX_STATUS_FAIL(TID_DISABLE);
563 	TX_STATUS_FAIL(FIFO_FLUSHED);
564 	TX_STATUS_FAIL(SMALL_CF_POLL);
565 	TX_STATUS_FAIL(FW_DROP);
566 	TX_STATUS_FAIL(STA_COLOR_MISMATCH);
567 	}
568 
569 	return "UNKNOWN";
570 
571 #undef TX_STATUS_FAIL
572 #undef TX_STATUS_POSTPONE
573 }
574 #endif /* CONFIG_IWLWIFI_DEBUG */
575 
iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,enum ieee80211_band band,struct ieee80211_tx_rate * r)576 void iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,
577 			       enum ieee80211_band band,
578 			       struct ieee80211_tx_rate *r)
579 {
580 	if (rate_n_flags & RATE_HT_MCS_GF_MSK)
581 		r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
582 	switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
583 	case RATE_MCS_CHAN_WIDTH_20:
584 		break;
585 	case RATE_MCS_CHAN_WIDTH_40:
586 		r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
587 		break;
588 	case RATE_MCS_CHAN_WIDTH_80:
589 		r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
590 		break;
591 	case RATE_MCS_CHAN_WIDTH_160:
592 		r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
593 		break;
594 	}
595 	if (rate_n_flags & RATE_MCS_SGI_MSK)
596 		r->flags |= IEEE80211_TX_RC_SHORT_GI;
597 	if (rate_n_flags & RATE_MCS_HT_MSK) {
598 		r->flags |= IEEE80211_TX_RC_MCS;
599 		r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
600 	} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
601 		ieee80211_rate_set_vht(
602 			r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
603 			((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
604 						RATE_VHT_MCS_NSS_POS) + 1);
605 		r->flags |= IEEE80211_TX_RC_VHT_MCS;
606 	} else {
607 		r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
608 							     band);
609 	}
610 }
611 
612 /**
613  * translate ucode response to mac80211 tx status control values
614  */
iwl_mvm_hwrate_to_tx_status(u32 rate_n_flags,struct ieee80211_tx_info * info)615 static void iwl_mvm_hwrate_to_tx_status(u32 rate_n_flags,
616 					struct ieee80211_tx_info *info)
617 {
618 	struct ieee80211_tx_rate *r = &info->status.rates[0];
619 
620 	info->status.antenna =
621 		((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
622 	iwl_mvm_hwrate_to_tx_rate(rate_n_flags, info->band, r);
623 }
624 
iwl_mvm_rx_tx_cmd_single(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)625 static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
626 				     struct iwl_rx_packet *pkt)
627 {
628 	struct ieee80211_sta *sta;
629 	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
630 	int txq_id = SEQ_TO_QUEUE(sequence);
631 	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
632 	int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
633 	int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
634 	u32 status = le16_to_cpu(tx_resp->status.status);
635 	u16 ssn = iwl_mvm_get_scd_ssn(tx_resp);
636 	struct iwl_mvm_sta *mvmsta;
637 	struct sk_buff_head skbs;
638 	u8 skb_freed = 0;
639 	u16 next_reclaimed, seq_ctl;
640 
641 	__skb_queue_head_init(&skbs);
642 
643 	seq_ctl = le16_to_cpu(tx_resp->seq_ctl);
644 
645 	/* we can free until ssn % q.n_bd not inclusive */
646 	iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);
647 
648 	while (!skb_queue_empty(&skbs)) {
649 		struct sk_buff *skb = __skb_dequeue(&skbs);
650 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
651 
652 		skb_freed++;
653 
654 		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
655 
656 		memset(&info->status, 0, sizeof(info->status));
657 
658 		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
659 
660 		/* inform mac80211 about what happened with the frame */
661 		switch (status & TX_STATUS_MSK) {
662 		case TX_STATUS_SUCCESS:
663 		case TX_STATUS_DIRECT_DONE:
664 			info->flags |= IEEE80211_TX_STAT_ACK;
665 			break;
666 		case TX_STATUS_FAIL_DEST_PS:
667 			info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
668 			break;
669 		default:
670 			break;
671 		}
672 
673 		info->status.rates[0].count = tx_resp->failure_frame + 1;
674 		iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate),
675 					    info);
676 		info->status.status_driver_data[1] =
677 			(void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate);
678 
679 		/* Single frame failure in an AMPDU queue => send BAR */
680 		if (txq_id >= mvm->first_agg_queue &&
681 		    !(info->flags & IEEE80211_TX_STAT_ACK) &&
682 		    !(info->flags & IEEE80211_TX_STAT_TX_FILTERED))
683 			info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
684 
685 		/* W/A FW bug: seq_ctl is wrong when the status isn't success */
686 		if (status != TX_STATUS_SUCCESS) {
687 			struct ieee80211_hdr *hdr = (void *)skb->data;
688 			seq_ctl = le16_to_cpu(hdr->seq_ctrl);
689 		}
690 
691 		/*
692 		 * TODO: this is not accurate if we are freeing more than one
693 		 * packet.
694 		 */
695 		info->status.tx_time =
696 			le16_to_cpu(tx_resp->wireless_media_time);
697 		BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
698 		info->status.status_driver_data[0] =
699 				(void *)(uintptr_t)tx_resp->reduced_tpc;
700 
701 		ieee80211_tx_status(mvm->hw, skb);
702 	}
703 
704 	if (txq_id >= mvm->first_agg_queue) {
705 		/* If this is an aggregation queue, we use the ssn since:
706 		 * ssn = wifi seq_num % 256.
707 		 * The seq_ctl is the sequence control of the packet to which
708 		 * this Tx response relates. But if there is a hole in the
709 		 * bitmap of the BA we received, this Tx response may allow to
710 		 * reclaim the hole and all the subsequent packets that were
711 		 * already acked. In that case, seq_ctl != ssn, and the next
712 		 * packet to be reclaimed will be ssn and not seq_ctl. In that
713 		 * case, several packets will be reclaimed even if
714 		 * frame_count = 1.
715 		 *
716 		 * The ssn is the index (% 256) of the latest packet that has
717 		 * treated (acked / dropped) + 1.
718 		 */
719 		next_reclaimed = ssn;
720 	} else {
721 		/* The next packet to be reclaimed is the one after this one */
722 		next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
723 	}
724 
725 	IWL_DEBUG_TX_REPLY(mvm,
726 			   "TXQ %d status %s (0x%08x)\n",
727 			   txq_id, iwl_mvm_get_tx_fail_reason(status), status);
728 
729 	IWL_DEBUG_TX_REPLY(mvm,
730 			   "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
731 			   le32_to_cpu(tx_resp->initial_rate),
732 			   tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
733 			   ssn, next_reclaimed, seq_ctl);
734 
735 	rcu_read_lock();
736 
737 	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
738 	/*
739 	 * sta can't be NULL otherwise it'd mean that the sta has been freed in
740 	 * the firmware while we still have packets for it in the Tx queues.
741 	 */
742 	if (WARN_ON_ONCE(!sta))
743 		goto out;
744 
745 	if (!IS_ERR(sta)) {
746 		mvmsta = iwl_mvm_sta_from_mac80211(sta);
747 
748 		if (tid != IWL_TID_NON_QOS) {
749 			struct iwl_mvm_tid_data *tid_data =
750 				&mvmsta->tid_data[tid];
751 
752 			spin_lock_bh(&mvmsta->lock);
753 			tid_data->next_reclaimed = next_reclaimed;
754 			IWL_DEBUG_TX_REPLY(mvm, "Next reclaimed packet:%d\n",
755 					   next_reclaimed);
756 			iwl_mvm_check_ratid_empty(mvm, sta, tid);
757 			spin_unlock_bh(&mvmsta->lock);
758 		}
759 
760 		if (mvmsta->next_status_eosp) {
761 			mvmsta->next_status_eosp = false;
762 			ieee80211_sta_eosp(sta);
763 		}
764 	} else {
765 		mvmsta = NULL;
766 	}
767 
768 	/*
769 	 * If the txq is not an AMPDU queue, there is no chance we freed
770 	 * several skbs. Check that out...
771 	 */
772 	if (txq_id >= mvm->first_agg_queue)
773 		goto out;
774 
775 	/* We can't free more than one frame at once on a shared queue */
776 	WARN_ON(skb_freed > 1);
777 
778 	/* If we have still frames for this STA nothing to do here */
779 	if (!atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id]))
780 		goto out;
781 
782 	if (mvmsta && mvmsta->vif->type == NL80211_IFTYPE_AP) {
783 
784 		/*
785 		 * If there are no pending frames for this STA and
786 		 * the tx to this station is not disabled, notify
787 		 * mac80211 that this station can now wake up in its
788 		 * STA table.
789 		 * If mvmsta is not NULL, sta is valid.
790 		 */
791 
792 		spin_lock_bh(&mvmsta->lock);
793 
794 		if (!mvmsta->disable_tx)
795 			ieee80211_sta_block_awake(mvm->hw, sta, false);
796 
797 		spin_unlock_bh(&mvmsta->lock);
798 	}
799 
800 	if (PTR_ERR(sta) == -EBUSY || PTR_ERR(sta) == -ENOENT) {
801 		/*
802 		 * We are draining and this was the last packet - pre_rcu_remove
803 		 * has been called already. We might be after the
804 		 * synchronize_net already.
805 		 * Don't rely on iwl_mvm_rm_sta to see the empty Tx queues.
806 		 */
807 		set_bit(sta_id, mvm->sta_drained);
808 		schedule_work(&mvm->sta_drained_wk);
809 	}
810 
811 out:
812 	rcu_read_unlock();
813 }
814 
815 #ifdef CONFIG_IWLWIFI_DEBUG
816 #define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
iwl_get_agg_tx_status(u16 status)817 static const char *iwl_get_agg_tx_status(u16 status)
818 {
819 	switch (status & AGG_TX_STATE_STATUS_MSK) {
820 	AGG_TX_STATE_(TRANSMITTED);
821 	AGG_TX_STATE_(UNDERRUN);
822 	AGG_TX_STATE_(BT_PRIO);
823 	AGG_TX_STATE_(FEW_BYTES);
824 	AGG_TX_STATE_(ABORT);
825 	AGG_TX_STATE_(LAST_SENT_TTL);
826 	AGG_TX_STATE_(LAST_SENT_TRY_CNT);
827 	AGG_TX_STATE_(LAST_SENT_BT_KILL);
828 	AGG_TX_STATE_(SCD_QUERY);
829 	AGG_TX_STATE_(TEST_BAD_CRC32);
830 	AGG_TX_STATE_(RESPONSE);
831 	AGG_TX_STATE_(DUMP_TX);
832 	AGG_TX_STATE_(DELAY_TX);
833 	}
834 
835 	return "UNKNOWN";
836 }
837 
iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)838 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
839 				      struct iwl_rx_packet *pkt)
840 {
841 	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
842 	struct agg_tx_status *frame_status = &tx_resp->status;
843 	int i;
844 
845 	for (i = 0; i < tx_resp->frame_count; i++) {
846 		u16 fstatus = le16_to_cpu(frame_status[i].status);
847 
848 		IWL_DEBUG_TX_REPLY(mvm,
849 				   "status %s (0x%04x), try-count (%d) seq (0x%x)\n",
850 				   iwl_get_agg_tx_status(fstatus),
851 				   fstatus & AGG_TX_STATE_STATUS_MSK,
852 				   (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
853 					AGG_TX_STATE_TRY_CNT_POS,
854 				   le16_to_cpu(frame_status[i].sequence));
855 	}
856 }
857 #else
iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)858 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
859 				      struct iwl_rx_packet *pkt)
860 {}
861 #endif /* CONFIG_IWLWIFI_DEBUG */
862 
iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)863 static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
864 				  struct iwl_rx_packet *pkt)
865 {
866 	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
867 	int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
868 	int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
869 	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
870 	struct ieee80211_sta *sta;
871 
872 	if (WARN_ON_ONCE(SEQ_TO_QUEUE(sequence) < mvm->first_agg_queue))
873 		return;
874 
875 	if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
876 		return;
877 
878 	iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);
879 
880 	rcu_read_lock();
881 
882 	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
883 
884 	if (!WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
885 		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
886 		mvmsta->tid_data[tid].rate_n_flags =
887 			le32_to_cpu(tx_resp->initial_rate);
888 		mvmsta->tid_data[tid].reduced_tpc = tx_resp->reduced_tpc;
889 		mvmsta->tid_data[tid].tx_time =
890 			le16_to_cpu(tx_resp->wireless_media_time);
891 	}
892 
893 	rcu_read_unlock();
894 }
895 
iwl_mvm_rx_tx_cmd(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb,struct iwl_device_cmd * cmd)896 int iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
897 		      struct iwl_device_cmd *cmd)
898 {
899 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
900 	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
901 
902 	if (tx_resp->frame_count == 1)
903 		iwl_mvm_rx_tx_cmd_single(mvm, pkt);
904 	else
905 		iwl_mvm_rx_tx_cmd_agg(mvm, pkt);
906 
907 	return 0;
908 }
909 
iwl_mvm_tx_info_from_ba_notif(struct ieee80211_tx_info * info,struct iwl_mvm_ba_notif * ba_notif,struct iwl_mvm_tid_data * tid_data)910 static void iwl_mvm_tx_info_from_ba_notif(struct ieee80211_tx_info *info,
911 					  struct iwl_mvm_ba_notif *ba_notif,
912 					  struct iwl_mvm_tid_data *tid_data)
913 {
914 	info->flags |= IEEE80211_TX_STAT_AMPDU;
915 	info->status.ampdu_ack_len = ba_notif->txed_2_done;
916 	info->status.ampdu_len = ba_notif->txed;
917 	iwl_mvm_hwrate_to_tx_status(tid_data->rate_n_flags,
918 				    info);
919 	/* TODO: not accounted if the whole A-MPDU failed */
920 	info->status.tx_time = tid_data->tx_time;
921 	info->status.status_driver_data[0] =
922 		(void *)(uintptr_t)tid_data->reduced_tpc;
923 	info->status.status_driver_data[1] =
924 		(void *)(uintptr_t)tid_data->rate_n_flags;
925 }
926 
iwl_mvm_rx_ba_notif(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb,struct iwl_device_cmd * cmd)927 int iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
928 			struct iwl_device_cmd *cmd)
929 {
930 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
931 	struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data;
932 	struct sk_buff_head reclaimed_skbs;
933 	struct iwl_mvm_tid_data *tid_data;
934 	struct ieee80211_sta *sta;
935 	struct iwl_mvm_sta *mvmsta;
936 	struct sk_buff *skb;
937 	int sta_id, tid, freed;
938 	/* "flow" corresponds to Tx queue */
939 	u16 scd_flow = le16_to_cpu(ba_notif->scd_flow);
940 	/* "ssn" is start of block-ack Tx window, corresponds to index
941 	 * (in Tx queue's circular buffer) of first TFD/frame in window */
942 	u16 ba_resp_scd_ssn = le16_to_cpu(ba_notif->scd_ssn);
943 
944 	sta_id = ba_notif->sta_id;
945 	tid = ba_notif->tid;
946 
947 	if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT ||
948 		      tid >= IWL_MAX_TID_COUNT,
949 		      "sta_id %d tid %d", sta_id, tid))
950 		return 0;
951 
952 	rcu_read_lock();
953 
954 	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
955 
956 	/* Reclaiming frames for a station that has been deleted ? */
957 	if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
958 		rcu_read_unlock();
959 		return 0;
960 	}
961 
962 	mvmsta = iwl_mvm_sta_from_mac80211(sta);
963 	tid_data = &mvmsta->tid_data[tid];
964 
965 	if (tid_data->txq_id != scd_flow) {
966 		IWL_ERR(mvm,
967 			"invalid BA notification: Q %d, tid %d, flow %d\n",
968 			tid_data->txq_id, tid, scd_flow);
969 		rcu_read_unlock();
970 		return 0;
971 	}
972 
973 	spin_lock_bh(&mvmsta->lock);
974 
975 	__skb_queue_head_init(&reclaimed_skbs);
976 
977 	/*
978 	 * Release all TFDs before the SSN, i.e. all TFDs in front of
979 	 * block-ack window (we assume that they've been successfully
980 	 * transmitted ... if not, it's too late anyway).
981 	 */
982 	iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn,
983 			  &reclaimed_skbs);
984 
985 	IWL_DEBUG_TX_REPLY(mvm,
986 			   "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
987 			   (u8 *)&ba_notif->sta_addr_lo32,
988 			   ba_notif->sta_id);
989 	IWL_DEBUG_TX_REPLY(mvm,
990 			   "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
991 			   ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
992 			   (unsigned long long)le64_to_cpu(ba_notif->bitmap),
993 			   scd_flow, ba_resp_scd_ssn, ba_notif->txed,
994 			   ba_notif->txed_2_done);
995 
996 	tid_data->next_reclaimed = ba_resp_scd_ssn;
997 
998 	iwl_mvm_check_ratid_empty(mvm, sta, tid);
999 
1000 	freed = 0;
1001 
1002 	skb_queue_walk(&reclaimed_skbs, skb) {
1003 		struct ieee80211_hdr *hdr = (void *)skb->data;
1004 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1005 
1006 		if (ieee80211_is_data_qos(hdr->frame_control))
1007 			freed++;
1008 		else
1009 			WARN_ON_ONCE(1);
1010 
1011 		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
1012 
1013 		memset(&info->status, 0, sizeof(info->status));
1014 		/* Packet was transmitted successfully, failures come as single
1015 		 * frames because before failing a frame the firmware transmits
1016 		 * it without aggregation at least once.
1017 		 */
1018 		info->flags |= IEEE80211_TX_STAT_ACK;
1019 
1020 		/* this is the first skb we deliver in this batch */
1021 		/* put the rate scaling data there */
1022 		if (freed == 1)
1023 			iwl_mvm_tx_info_from_ba_notif(info, ba_notif, tid_data);
1024 	}
1025 
1026 	spin_unlock_bh(&mvmsta->lock);
1027 
1028 	/* We got a BA notif with 0 acked or scd_ssn didn't progress which is
1029 	 * possible (i.e. first MPDU in the aggregation wasn't acked)
1030 	 * Still it's important to update RS about sent vs. acked.
1031 	 */
1032 	if (skb_queue_empty(&reclaimed_skbs)) {
1033 		struct ieee80211_tx_info ba_info = {};
1034 		struct ieee80211_chanctx_conf *chanctx_conf = NULL;
1035 
1036 		if (mvmsta->vif)
1037 			chanctx_conf =
1038 				rcu_dereference(mvmsta->vif->chanctx_conf);
1039 
1040 		if (WARN_ON_ONCE(!chanctx_conf))
1041 			goto out;
1042 
1043 		ba_info.band = chanctx_conf->def.chan->band;
1044 		iwl_mvm_tx_info_from_ba_notif(&ba_info, ba_notif, tid_data);
1045 
1046 		IWL_DEBUG_TX_REPLY(mvm, "No reclaim. Update rs directly\n");
1047 		iwl_mvm_rs_tx_status(mvm, sta, tid, &ba_info);
1048 	}
1049 
1050 out:
1051 	rcu_read_unlock();
1052 
1053 	while (!skb_queue_empty(&reclaimed_skbs)) {
1054 		skb = __skb_dequeue(&reclaimed_skbs);
1055 		ieee80211_tx_status(mvm->hw, skb);
1056 	}
1057 
1058 	return 0;
1059 }
1060 
1061 /*
1062  * Note that there are transports that buffer frames before they reach
1063  * the firmware. This means that after flush_tx_path is called, the
1064  * queue might not be empty. The race-free way to handle this is to:
1065  * 1) set the station as draining
1066  * 2) flush the Tx path
1067  * 3) wait for the transport queues to be empty
1068  */
iwl_mvm_flush_tx_path(struct iwl_mvm * mvm,u32 tfd_msk,bool sync)1069 int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, bool sync)
1070 {
1071 	int ret;
1072 	struct iwl_tx_path_flush_cmd flush_cmd = {
1073 		.queues_ctl = cpu_to_le32(tfd_msk),
1074 		.flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
1075 	};
1076 
1077 	u32 flags = sync ? 0 : CMD_ASYNC;
1078 
1079 	ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags,
1080 				   sizeof(flush_cmd), &flush_cmd);
1081 	if (ret)
1082 		IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
1083 	return ret;
1084 }
1085