1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2012 Intel Corporation. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *
28 *****************************************************************************/
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/sched.h>
34 #include <linux/ieee80211.h>
35
36 #include "iwl-dev.h"
37 #include "iwl-core.h"
38 #include "iwl-io.h"
39 #include "iwl-agn-hw.h"
40 #include "iwl-agn.h"
41 #include "iwl-trans.h"
42
iwlagn_tx_cmd_protection(struct iwl_priv * priv,struct ieee80211_tx_info * info,__le16 fc,__le32 * tx_flags)43 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
44 struct ieee80211_tx_info *info,
45 __le16 fc, __le32 *tx_flags)
46 {
47 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
48 info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
49 info->flags & IEEE80211_TX_CTL_AMPDU)
50 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
51 }
52
53 /*
54 * handle build REPLY_TX command notification.
55 */
iwlagn_tx_cmd_build_basic(struct iwl_priv * priv,struct sk_buff * skb,struct iwl_tx_cmd * tx_cmd,struct ieee80211_tx_info * info,struct ieee80211_hdr * hdr,u8 sta_id)56 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
57 struct sk_buff *skb,
58 struct iwl_tx_cmd *tx_cmd,
59 struct ieee80211_tx_info *info,
60 struct ieee80211_hdr *hdr, u8 sta_id)
61 {
62 __le16 fc = hdr->frame_control;
63 __le32 tx_flags = tx_cmd->tx_flags;
64
65 tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
66
67 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
68 tx_flags |= TX_CMD_FLG_ACK_MSK;
69 else
70 tx_flags &= ~TX_CMD_FLG_ACK_MSK;
71
72 if (ieee80211_is_probe_resp(fc))
73 tx_flags |= TX_CMD_FLG_TSF_MSK;
74 else if (ieee80211_is_back_req(fc))
75 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
76 else if (info->band == IEEE80211_BAND_2GHZ &&
77 cfg(priv)->bt_params &&
78 cfg(priv)->bt_params->advanced_bt_coexist &&
79 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
80 ieee80211_is_reassoc_req(fc) ||
81 skb->protocol == cpu_to_be16(ETH_P_PAE)))
82 tx_flags |= TX_CMD_FLG_IGNORE_BT;
83
84
85 tx_cmd->sta_id = sta_id;
86 if (ieee80211_has_morefrags(fc))
87 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
88
89 if (ieee80211_is_data_qos(fc)) {
90 u8 *qc = ieee80211_get_qos_ctl(hdr);
91 tx_cmd->tid_tspec = qc[0] & 0xf;
92 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
93 } else {
94 tx_cmd->tid_tspec = IWL_TID_NON_QOS;
95 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
96 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
97 else
98 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
99 }
100
101 iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
102
103 tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
104 if (ieee80211_is_mgmt(fc)) {
105 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
106 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
107 else
108 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
109 } else {
110 tx_cmd->timeout.pm_frame_timeout = 0;
111 }
112
113 tx_cmd->driver_txop = 0;
114 tx_cmd->tx_flags = tx_flags;
115 tx_cmd->next_frame_len = 0;
116 }
117
iwlagn_tx_cmd_build_rate(struct iwl_priv * priv,struct iwl_tx_cmd * tx_cmd,struct ieee80211_tx_info * info,__le16 fc)118 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
119 struct iwl_tx_cmd *tx_cmd,
120 struct ieee80211_tx_info *info,
121 __le16 fc)
122 {
123 u32 rate_flags;
124 int rate_idx;
125 u8 rts_retry_limit;
126 u8 data_retry_limit;
127 u8 rate_plcp;
128
129 if (priv->wowlan) {
130 rts_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
131 data_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
132 } else {
133 /* Set retry limit on RTS packets */
134 rts_retry_limit = IWLAGN_RTS_DFAULT_RETRY_LIMIT;
135
136 /* Set retry limit on DATA packets and Probe Responses*/
137 if (ieee80211_is_probe_resp(fc)) {
138 data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT;
139 rts_retry_limit =
140 min(data_retry_limit, rts_retry_limit);
141 } else if (ieee80211_is_back_req(fc))
142 data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT;
143 else
144 data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
145 }
146
147 tx_cmd->data_retry_limit = data_retry_limit;
148 tx_cmd->rts_retry_limit = rts_retry_limit;
149
150 /* DATA packets will use the uCode station table for rate/antenna
151 * selection */
152 if (ieee80211_is_data(fc)) {
153 tx_cmd->initial_rate_index = 0;
154 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
155 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
156 if (priv->tm_fixed_rate) {
157 /*
158 * rate overwrite by testmode
159 * we not only send lq command to change rate
160 * we also re-enforce per data pkt base.
161 */
162 tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
163 memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
164 sizeof(tx_cmd->rate_n_flags));
165 }
166 #endif
167 return;
168 } else if (ieee80211_is_back_req(fc))
169 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
170
171 /**
172 * If the current TX rate stored in mac80211 has the MCS bit set, it's
173 * not really a TX rate. Thus, we use the lowest supported rate for
174 * this band. Also use the lowest supported rate if the stored rate
175 * index is invalid.
176 */
177 rate_idx = info->control.rates[0].idx;
178 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
179 (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
180 rate_idx = rate_lowest_index(&priv->bands[info->band],
181 info->control.sta);
182 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
183 if (info->band == IEEE80211_BAND_5GHZ)
184 rate_idx += IWL_FIRST_OFDM_RATE;
185 /* Get PLCP rate for tx_cmd->rate_n_flags */
186 rate_plcp = iwl_rates[rate_idx].plcp;
187 /* Zero out flags for this packet */
188 rate_flags = 0;
189
190 /* Set CCK flag as needed */
191 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
192 rate_flags |= RATE_MCS_CCK_MSK;
193
194 /* Set up antennas */
195 if (cfg(priv)->bt_params &&
196 cfg(priv)->bt_params->advanced_bt_coexist &&
197 priv->bt_full_concurrent) {
198 /* operated as 1x1 in full concurrency mode */
199 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
200 first_antenna(hw_params(priv).valid_tx_ant));
201 } else
202 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
203 hw_params(priv).valid_tx_ant);
204 rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
205
206 /* Set the rate in the TX cmd */
207 tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
208 }
209
iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv * priv,struct ieee80211_tx_info * info,struct iwl_tx_cmd * tx_cmd,struct sk_buff * skb_frag)210 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
211 struct ieee80211_tx_info *info,
212 struct iwl_tx_cmd *tx_cmd,
213 struct sk_buff *skb_frag)
214 {
215 struct ieee80211_key_conf *keyconf = info->control.hw_key;
216
217 switch (keyconf->cipher) {
218 case WLAN_CIPHER_SUITE_CCMP:
219 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
220 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
221 if (info->flags & IEEE80211_TX_CTL_AMPDU)
222 tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
223 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
224 break;
225
226 case WLAN_CIPHER_SUITE_TKIP:
227 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
228 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
229 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
230 break;
231
232 case WLAN_CIPHER_SUITE_WEP104:
233 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
234 /* fall through */
235 case WLAN_CIPHER_SUITE_WEP40:
236 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
237 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
238
239 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
240
241 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
242 "with key %d\n", keyconf->keyidx);
243 break;
244
245 default:
246 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
247 break;
248 }
249 }
250
251 /**
252 * iwl_sta_id_or_broadcast - return sta_id or broadcast sta
253 * @context: the current context
254 * @sta: mac80211 station
255 *
256 * In certain circumstances mac80211 passes a station pointer
257 * that may be %NULL, for example during TX or key setup. In
258 * that case, we need to use the broadcast station, so this
259 * inline wraps that pattern.
260 */
iwl_sta_id_or_broadcast(struct iwl_rxon_context * context,struct ieee80211_sta * sta)261 static int iwl_sta_id_or_broadcast(struct iwl_rxon_context *context,
262 struct ieee80211_sta *sta)
263 {
264 int sta_id;
265
266 if (!sta)
267 return context->bcast_sta_id;
268
269 sta_id = iwl_sta_id(sta);
270
271 /*
272 * mac80211 should not be passing a partially
273 * initialised station!
274 */
275 WARN_ON(sta_id == IWL_INVALID_STATION);
276
277 return sta_id;
278 }
279
280 /*
281 * start REPLY_TX command process
282 */
iwlagn_tx_skb(struct iwl_priv * priv,struct sk_buff * skb)283 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
284 {
285 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
286 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
287 struct iwl_station_priv *sta_priv = NULL;
288 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
289 struct iwl_device_cmd *dev_cmd = NULL;
290 struct iwl_tx_cmd *tx_cmd;
291 __le16 fc;
292 u8 hdr_len;
293 u16 len, seq_number = 0;
294 u8 sta_id, tid = IWL_MAX_TID_COUNT;
295 bool is_agg = false;
296
297 if (info->control.vif)
298 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
299
300 if (iwl_is_rfkill(priv)) {
301 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
302 goto drop_unlock_priv;
303 }
304
305 fc = hdr->frame_control;
306
307 #ifdef CONFIG_IWLWIFI_DEBUG
308 if (ieee80211_is_auth(fc))
309 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
310 else if (ieee80211_is_assoc_req(fc))
311 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
312 else if (ieee80211_is_reassoc_req(fc))
313 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
314 #endif
315
316 if (unlikely(ieee80211_is_probe_resp(fc))) {
317 struct iwl_wipan_noa_data *noa_data =
318 rcu_dereference(priv->noa_data);
319
320 if (noa_data &&
321 pskb_expand_head(skb, 0, noa_data->length,
322 GFP_ATOMIC) == 0) {
323 memcpy(skb_put(skb, noa_data->length),
324 noa_data->data, noa_data->length);
325 hdr = (struct ieee80211_hdr *)skb->data;
326 }
327 }
328
329 hdr_len = ieee80211_hdrlen(fc);
330
331 /* For management frames use broadcast id to do not break aggregation */
332 if (!ieee80211_is_data(fc))
333 sta_id = ctx->bcast_sta_id;
334 else {
335 /* Find index into station table for destination station */
336 sta_id = iwl_sta_id_or_broadcast(ctx, info->control.sta);
337 if (sta_id == IWL_INVALID_STATION) {
338 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
339 hdr->addr1);
340 goto drop_unlock_priv;
341 }
342 }
343
344 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
345
346 if (info->control.sta)
347 sta_priv = (void *)info->control.sta->drv_priv;
348
349 if (sta_priv && sta_priv->asleep &&
350 (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)) {
351 /*
352 * This sends an asynchronous command to the device,
353 * but we can rely on it being processed before the
354 * next frame is processed -- and the next frame to
355 * this station is the one that will consume this
356 * counter.
357 * For now set the counter to just 1 since we do not
358 * support uAPSD yet.
359 *
360 * FIXME: If we get two non-bufferable frames one
361 * after the other, we might only send out one of
362 * them because this is racy.
363 */
364 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
365 }
366
367 if (info->flags & IEEE80211_TX_CTL_AMPDU)
368 is_agg = true;
369
370 dev_cmd = kmem_cache_alloc(iwl_tx_cmd_pool, GFP_ATOMIC);
371
372 if (unlikely(!dev_cmd))
373 goto drop_unlock_priv;
374
375 memset(dev_cmd, 0, sizeof(*dev_cmd));
376 tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
377
378 /* Total # bytes to be transmitted */
379 len = (u16)skb->len;
380 tx_cmd->len = cpu_to_le16(len);
381
382 if (info->control.hw_key)
383 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb);
384
385 /* TODO need this for burst mode later on */
386 iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
387 iwl_dbg_log_tx_data_frame(priv, len, hdr);
388
389 iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
390
391 iwl_update_stats(priv, true, fc, len);
392
393 memset(&info->status, 0, sizeof(info->status));
394
395 info->driver_data[0] = ctx;
396 info->driver_data[1] = dev_cmd;
397
398 spin_lock(&priv->sta_lock);
399
400 if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
401 u8 *qc = NULL;
402 struct iwl_tid_data *tid_data;
403 qc = ieee80211_get_qos_ctl(hdr);
404 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
405 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
406 goto drop_unlock_sta;
407 tid_data = &priv->tid_data[sta_id][tid];
408
409 /* aggregation is on for this <sta,tid> */
410 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
411 tid_data->agg.state != IWL_AGG_ON) {
412 IWL_ERR(priv, "TX_CTL_AMPDU while not in AGG:"
413 " Tx flags = 0x%08x, agg.state = %d",
414 info->flags, tid_data->agg.state);
415 IWL_ERR(priv, "sta_id = %d, tid = %d seq_num = %d",
416 sta_id, tid, SEQ_TO_SN(tid_data->seq_number));
417 goto drop_unlock_sta;
418 }
419
420 /* We can receive packets from the stack in IWL_AGG_{ON,OFF}
421 * only. Check this here.
422 */
423 if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON &&
424 tid_data->agg.state != IWL_AGG_OFF,
425 "Tx while agg.state = %d", tid_data->agg.state))
426 goto drop_unlock_sta;
427
428 seq_number = tid_data->seq_number;
429 seq_number &= IEEE80211_SCTL_SEQ;
430 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
431 hdr->seq_ctrl |= cpu_to_le16(seq_number);
432 seq_number += 0x10;
433 }
434
435 /* Copy MAC header from skb into command buffer */
436 memcpy(tx_cmd->hdr, hdr, hdr_len);
437
438 if (iwl_trans_tx(trans(priv), skb, dev_cmd, ctx->ctxid, sta_id, tid))
439 goto drop_unlock_sta;
440
441 if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc) &&
442 !ieee80211_has_morefrags(fc))
443 priv->tid_data[sta_id][tid].seq_number = seq_number;
444
445 spin_unlock(&priv->sta_lock);
446
447 /*
448 * Avoid atomic ops if it isn't an associated client.
449 * Also, if this is a packet for aggregation, don't
450 * increase the counter because the ucode will stop
451 * aggregation queues when their respective station
452 * goes to sleep.
453 */
454 if (sta_priv && sta_priv->client && !is_agg)
455 atomic_inc(&sta_priv->pending_frames);
456
457 return 0;
458
459 drop_unlock_sta:
460 if (dev_cmd)
461 kmem_cache_free(iwl_tx_cmd_pool, dev_cmd);
462 spin_unlock(&priv->sta_lock);
463 drop_unlock_priv:
464 return -1;
465 }
466
iwlagn_tx_agg_stop(struct iwl_priv * priv,struct ieee80211_vif * vif,struct ieee80211_sta * sta,u16 tid)467 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
468 struct ieee80211_sta *sta, u16 tid)
469 {
470 struct iwl_tid_data *tid_data;
471 int sta_id;
472
473 sta_id = iwl_sta_id(sta);
474
475 if (sta_id == IWL_INVALID_STATION) {
476 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
477 return -ENXIO;
478 }
479
480 spin_lock_bh(&priv->sta_lock);
481
482 tid_data = &priv->tid_data[sta_id][tid];
483
484 switch (priv->tid_data[sta_id][tid].agg.state) {
485 case IWL_EMPTYING_HW_QUEUE_ADDBA:
486 /*
487 * This can happen if the peer stops aggregation
488 * again before we've had a chance to drain the
489 * queue we selected previously, i.e. before the
490 * session was really started completely.
491 */
492 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
493 goto turn_off;
494 case IWL_AGG_ON:
495 break;
496 default:
497 IWL_WARN(priv, "Stopping AGG while state not ON "
498 "or starting for %d on %d (%d)\n", sta_id, tid,
499 priv->tid_data[sta_id][tid].agg.state);
500 spin_unlock_bh(&priv->sta_lock);
501 return 0;
502 }
503
504 tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
505
506 /* There are still packets for this RA / TID in the HW */
507 if (tid_data->agg.ssn != tid_data->next_reclaimed) {
508 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
509 "next_recl = %d",
510 tid_data->agg.ssn,
511 tid_data->next_reclaimed);
512 priv->tid_data[sta_id][tid].agg.state =
513 IWL_EMPTYING_HW_QUEUE_DELBA;
514 spin_unlock_bh(&priv->sta_lock);
515 return 0;
516 }
517
518 IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
519 tid_data->agg.ssn);
520 turn_off:
521 priv->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF;
522
523 spin_unlock_bh(&priv->sta_lock);
524
525 iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
526
527 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
528
529 return 0;
530 }
531
iwlagn_tx_agg_start(struct iwl_priv * priv,struct ieee80211_vif * vif,struct ieee80211_sta * sta,u16 tid,u16 * ssn)532 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
533 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
534 {
535 struct iwl_tid_data *tid_data;
536 int sta_id;
537 int ret;
538
539 IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
540 sta->addr, tid);
541
542 sta_id = iwl_sta_id(sta);
543 if (sta_id == IWL_INVALID_STATION) {
544 IWL_ERR(priv, "Start AGG on invalid station\n");
545 return -ENXIO;
546 }
547 if (unlikely(tid >= IWL_MAX_TID_COUNT))
548 return -EINVAL;
549
550 if (priv->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
551 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
552 return -ENXIO;
553 }
554
555 ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
556 if (ret)
557 return ret;
558
559 spin_lock_bh(&priv->sta_lock);
560
561 tid_data = &priv->tid_data[sta_id][tid];
562 tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
563
564 *ssn = tid_data->agg.ssn;
565
566 ret = iwl_trans_tx_agg_alloc(trans(priv), sta_id, tid);
567 if (ret) {
568 spin_unlock_bh(&priv->sta_lock);
569 return ret;
570 }
571
572 if (*ssn == tid_data->next_reclaimed) {
573 IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
574 tid_data->agg.ssn);
575 tid_data->agg.state = IWL_AGG_ON;
576 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
577 } else {
578 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
579 "next_reclaimed = %d",
580 tid_data->agg.ssn,
581 tid_data->next_reclaimed);
582 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
583 }
584
585 spin_unlock_bh(&priv->sta_lock);
586
587 return ret;
588 }
589
iwlagn_tx_agg_oper(struct iwl_priv * priv,struct ieee80211_vif * vif,struct ieee80211_sta * sta,u16 tid,u8 buf_size)590 int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif,
591 struct ieee80211_sta *sta, u16 tid, u8 buf_size)
592 {
593 struct iwl_station_priv *sta_priv = (void *) sta->drv_priv;
594 struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
595 u16 ssn;
596
597 buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
598
599 spin_lock_bh(&priv->sta_lock);
600 ssn = priv->tid_data[sta_priv->sta_id][tid].agg.ssn;
601 spin_unlock_bh(&priv->sta_lock);
602
603 iwl_trans_tx_agg_setup(trans(priv), ctx->ctxid, sta_priv->sta_id, tid,
604 buf_size, ssn);
605
606 /*
607 * If the limit is 0, then it wasn't initialised yet,
608 * use the default. We can do that since we take the
609 * minimum below, and we don't want to go above our
610 * default due to hardware restrictions.
611 */
612 if (sta_priv->max_agg_bufsize == 0)
613 sta_priv->max_agg_bufsize =
614 LINK_QUAL_AGG_FRAME_LIMIT_DEF;
615
616 /*
617 * Even though in theory the peer could have different
618 * aggregation reorder buffer sizes for different sessions,
619 * our ucode doesn't allow for that and has a global limit
620 * for each station. Therefore, use the minimum of all the
621 * aggregation sessions and our default value.
622 */
623 sta_priv->max_agg_bufsize =
624 min(sta_priv->max_agg_bufsize, buf_size);
625
626 if (hw_params(priv).use_rts_for_aggregation) {
627 /*
628 * switch to RTS/CTS if it is the prefer protection
629 * method for HT traffic
630 */
631
632 sta_priv->lq_sta.lq.general_params.flags |=
633 LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK;
634 }
635 priv->agg_tids_count++;
636 IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
637 priv->agg_tids_count);
638
639 sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit =
640 sta_priv->max_agg_bufsize;
641
642 IWL_DEBUG_HT(priv, "Tx aggregation enabled on ra = %pM tid = %d\n",
643 sta->addr, tid);
644
645 return iwl_send_lq_cmd(priv, ctx,
646 &sta_priv->lq_sta.lq, CMD_ASYNC, false);
647 }
648
iwlagn_check_ratid_empty(struct iwl_priv * priv,int sta_id,u8 tid)649 static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid)
650 {
651 struct iwl_tid_data *tid_data = &priv->tid_data[sta_id][tid];
652 enum iwl_rxon_context_id ctx;
653 struct ieee80211_vif *vif;
654 u8 *addr;
655
656 lockdep_assert_held(&priv->sta_lock);
657
658 addr = priv->stations[sta_id].sta.sta.addr;
659 ctx = priv->stations[sta_id].ctxid;
660 vif = priv->contexts[ctx].vif;
661
662 switch (priv->tid_data[sta_id][tid].agg.state) {
663 case IWL_EMPTYING_HW_QUEUE_DELBA:
664 /* There are no packets for this RA / TID in the HW any more */
665 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
666 IWL_DEBUG_TX_QUEUES(priv,
667 "Can continue DELBA flow ssn = next_recl ="
668 " %d", tid_data->next_reclaimed);
669 iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
670 tid_data->agg.state = IWL_AGG_OFF;
671 ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
672 }
673 break;
674 case IWL_EMPTYING_HW_QUEUE_ADDBA:
675 /* There are no packets for this RA / TID in the HW any more */
676 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
677 IWL_DEBUG_TX_QUEUES(priv,
678 "Can continue ADDBA flow ssn = next_recl ="
679 " %d", tid_data->next_reclaimed);
680 tid_data->agg.state = IWL_AGG_ON;
681 ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
682 }
683 break;
684 default:
685 break;
686 }
687 }
688
iwlagn_non_agg_tx_status(struct iwl_priv * priv,struct iwl_rxon_context * ctx,const u8 * addr1)689 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
690 struct iwl_rxon_context *ctx,
691 const u8 *addr1)
692 {
693 struct ieee80211_sta *sta;
694 struct iwl_station_priv *sta_priv;
695
696 rcu_read_lock();
697 sta = ieee80211_find_sta(ctx->vif, addr1);
698 if (sta) {
699 sta_priv = (void *)sta->drv_priv;
700 /* avoid atomic ops if this isn't a client */
701 if (sta_priv->client &&
702 atomic_dec_return(&sta_priv->pending_frames) == 0)
703 ieee80211_sta_block_awake(priv->hw, sta, false);
704 }
705 rcu_read_unlock();
706 }
707
708 /**
709 * translate ucode response to mac80211 tx status control values
710 */
iwlagn_hwrate_to_tx_control(struct iwl_priv * priv,u32 rate_n_flags,struct ieee80211_tx_info * info)711 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
712 struct ieee80211_tx_info *info)
713 {
714 struct ieee80211_tx_rate *r = &info->control.rates[0];
715
716 info->antenna_sel_tx =
717 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
718 if (rate_n_flags & RATE_MCS_HT_MSK)
719 r->flags |= IEEE80211_TX_RC_MCS;
720 if (rate_n_flags & RATE_MCS_GF_MSK)
721 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
722 if (rate_n_flags & RATE_MCS_HT40_MSK)
723 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
724 if (rate_n_flags & RATE_MCS_DUP_MSK)
725 r->flags |= IEEE80211_TX_RC_DUP_DATA;
726 if (rate_n_flags & RATE_MCS_SGI_MSK)
727 r->flags |= IEEE80211_TX_RC_SHORT_GI;
728 r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
729 }
730
731 #ifdef CONFIG_IWLWIFI_DEBUG
iwl_get_tx_fail_reason(u32 status)732 const char *iwl_get_tx_fail_reason(u32 status)
733 {
734 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
735 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
736
737 switch (status & TX_STATUS_MSK) {
738 case TX_STATUS_SUCCESS:
739 return "SUCCESS";
740 TX_STATUS_POSTPONE(DELAY);
741 TX_STATUS_POSTPONE(FEW_BYTES);
742 TX_STATUS_POSTPONE(BT_PRIO);
743 TX_STATUS_POSTPONE(QUIET_PERIOD);
744 TX_STATUS_POSTPONE(CALC_TTAK);
745 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
746 TX_STATUS_FAIL(SHORT_LIMIT);
747 TX_STATUS_FAIL(LONG_LIMIT);
748 TX_STATUS_FAIL(FIFO_UNDERRUN);
749 TX_STATUS_FAIL(DRAIN_FLOW);
750 TX_STATUS_FAIL(RFKILL_FLUSH);
751 TX_STATUS_FAIL(LIFE_EXPIRE);
752 TX_STATUS_FAIL(DEST_PS);
753 TX_STATUS_FAIL(HOST_ABORTED);
754 TX_STATUS_FAIL(BT_RETRY);
755 TX_STATUS_FAIL(STA_INVALID);
756 TX_STATUS_FAIL(FRAG_DROPPED);
757 TX_STATUS_FAIL(TID_DISABLE);
758 TX_STATUS_FAIL(FIFO_FLUSHED);
759 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
760 TX_STATUS_FAIL(PASSIVE_NO_RX);
761 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
762 }
763
764 return "UNKNOWN";
765
766 #undef TX_STATUS_FAIL
767 #undef TX_STATUS_POSTPONE
768 }
769 #endif /* CONFIG_IWLWIFI_DEBUG */
770
iwlagn_count_agg_tx_err_status(struct iwl_priv * priv,u16 status)771 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
772 {
773 status &= AGG_TX_STATUS_MSK;
774
775 switch (status) {
776 case AGG_TX_STATE_UNDERRUN_MSK:
777 priv->reply_agg_tx_stats.underrun++;
778 break;
779 case AGG_TX_STATE_BT_PRIO_MSK:
780 priv->reply_agg_tx_stats.bt_prio++;
781 break;
782 case AGG_TX_STATE_FEW_BYTES_MSK:
783 priv->reply_agg_tx_stats.few_bytes++;
784 break;
785 case AGG_TX_STATE_ABORT_MSK:
786 priv->reply_agg_tx_stats.abort++;
787 break;
788 case AGG_TX_STATE_LAST_SENT_TTL_MSK:
789 priv->reply_agg_tx_stats.last_sent_ttl++;
790 break;
791 case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
792 priv->reply_agg_tx_stats.last_sent_try++;
793 break;
794 case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
795 priv->reply_agg_tx_stats.last_sent_bt_kill++;
796 break;
797 case AGG_TX_STATE_SCD_QUERY_MSK:
798 priv->reply_agg_tx_stats.scd_query++;
799 break;
800 case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
801 priv->reply_agg_tx_stats.bad_crc32++;
802 break;
803 case AGG_TX_STATE_RESPONSE_MSK:
804 priv->reply_agg_tx_stats.response++;
805 break;
806 case AGG_TX_STATE_DUMP_TX_MSK:
807 priv->reply_agg_tx_stats.dump_tx++;
808 break;
809 case AGG_TX_STATE_DELAY_TX_MSK:
810 priv->reply_agg_tx_stats.delay_tx++;
811 break;
812 default:
813 priv->reply_agg_tx_stats.unknown++;
814 break;
815 }
816 }
817
iwl_rx_reply_tx_agg(struct iwl_priv * priv,struct iwlagn_tx_resp * tx_resp)818 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
819 struct iwlagn_tx_resp *tx_resp)
820 {
821 struct agg_tx_status *frame_status = &tx_resp->status;
822 int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
823 IWLAGN_TX_RES_TID_POS;
824 int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
825 IWLAGN_TX_RES_RA_POS;
826 struct iwl_ht_agg *agg = &priv->tid_data[sta_id][tid].agg;
827 u32 status = le16_to_cpu(tx_resp->status.status);
828 int i;
829
830 WARN_ON(tid == IWL_TID_NON_QOS);
831
832 if (agg->wait_for_ba)
833 IWL_DEBUG_TX_REPLY(priv,
834 "got tx response w/o block-ack\n");
835
836 agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
837 agg->wait_for_ba = (tx_resp->frame_count > 1);
838
839 /*
840 * If the BT kill count is non-zero, we'll get this
841 * notification again.
842 */
843 if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
844 cfg(priv)->bt_params &&
845 cfg(priv)->bt_params->advanced_bt_coexist) {
846 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
847 }
848
849 if (tx_resp->frame_count == 1)
850 return;
851
852 /* Construct bit-map of pending frames within Tx window */
853 for (i = 0; i < tx_resp->frame_count; i++) {
854 u16 fstatus = le16_to_cpu(frame_status[i].status);
855
856 if (status & AGG_TX_STATUS_MSK)
857 iwlagn_count_agg_tx_err_status(priv, fstatus);
858
859 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
860 AGG_TX_STATE_ABORT_MSK))
861 continue;
862
863 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
864 "try-count (0x%08x)\n",
865 iwl_get_agg_tx_fail_reason(fstatus),
866 fstatus & AGG_TX_STATUS_MSK,
867 fstatus & AGG_TX_TRY_MSK);
868 }
869 }
870
871 #ifdef CONFIG_IWLWIFI_DEBUG
872 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
873
iwl_get_agg_tx_fail_reason(u16 status)874 const char *iwl_get_agg_tx_fail_reason(u16 status)
875 {
876 status &= AGG_TX_STATUS_MSK;
877 switch (status) {
878 case AGG_TX_STATE_TRANSMITTED:
879 return "SUCCESS";
880 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
881 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
882 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
883 AGG_TX_STATE_FAIL(ABORT_MSK);
884 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
885 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
886 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
887 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
888 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
889 AGG_TX_STATE_FAIL(RESPONSE_MSK);
890 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
891 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
892 }
893
894 return "UNKNOWN";
895 }
896 #endif /* CONFIG_IWLWIFI_DEBUG */
897
iwlagn_get_scd_ssn(struct iwlagn_tx_resp * tx_resp)898 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
899 {
900 return le32_to_cpup((__le32 *)&tx_resp->status +
901 tx_resp->frame_count) & MAX_SN;
902 }
903
iwlagn_count_tx_err_status(struct iwl_priv * priv,u16 status)904 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
905 {
906 status &= TX_STATUS_MSK;
907
908 switch (status) {
909 case TX_STATUS_POSTPONE_DELAY:
910 priv->reply_tx_stats.pp_delay++;
911 break;
912 case TX_STATUS_POSTPONE_FEW_BYTES:
913 priv->reply_tx_stats.pp_few_bytes++;
914 break;
915 case TX_STATUS_POSTPONE_BT_PRIO:
916 priv->reply_tx_stats.pp_bt_prio++;
917 break;
918 case TX_STATUS_POSTPONE_QUIET_PERIOD:
919 priv->reply_tx_stats.pp_quiet_period++;
920 break;
921 case TX_STATUS_POSTPONE_CALC_TTAK:
922 priv->reply_tx_stats.pp_calc_ttak++;
923 break;
924 case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
925 priv->reply_tx_stats.int_crossed_retry++;
926 break;
927 case TX_STATUS_FAIL_SHORT_LIMIT:
928 priv->reply_tx_stats.short_limit++;
929 break;
930 case TX_STATUS_FAIL_LONG_LIMIT:
931 priv->reply_tx_stats.long_limit++;
932 break;
933 case TX_STATUS_FAIL_FIFO_UNDERRUN:
934 priv->reply_tx_stats.fifo_underrun++;
935 break;
936 case TX_STATUS_FAIL_DRAIN_FLOW:
937 priv->reply_tx_stats.drain_flow++;
938 break;
939 case TX_STATUS_FAIL_RFKILL_FLUSH:
940 priv->reply_tx_stats.rfkill_flush++;
941 break;
942 case TX_STATUS_FAIL_LIFE_EXPIRE:
943 priv->reply_tx_stats.life_expire++;
944 break;
945 case TX_STATUS_FAIL_DEST_PS:
946 priv->reply_tx_stats.dest_ps++;
947 break;
948 case TX_STATUS_FAIL_HOST_ABORTED:
949 priv->reply_tx_stats.host_abort++;
950 break;
951 case TX_STATUS_FAIL_BT_RETRY:
952 priv->reply_tx_stats.bt_retry++;
953 break;
954 case TX_STATUS_FAIL_STA_INVALID:
955 priv->reply_tx_stats.sta_invalid++;
956 break;
957 case TX_STATUS_FAIL_FRAG_DROPPED:
958 priv->reply_tx_stats.frag_drop++;
959 break;
960 case TX_STATUS_FAIL_TID_DISABLE:
961 priv->reply_tx_stats.tid_disable++;
962 break;
963 case TX_STATUS_FAIL_FIFO_FLUSHED:
964 priv->reply_tx_stats.fifo_flush++;
965 break;
966 case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
967 priv->reply_tx_stats.insuff_cf_poll++;
968 break;
969 case TX_STATUS_FAIL_PASSIVE_NO_RX:
970 priv->reply_tx_stats.fail_hw_drop++;
971 break;
972 case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
973 priv->reply_tx_stats.sta_color_mismatch++;
974 break;
975 default:
976 priv->reply_tx_stats.unknown++;
977 break;
978 }
979 }
980
iwlagn_set_tx_status(struct iwl_priv * priv,struct ieee80211_tx_info * info,struct iwlagn_tx_resp * tx_resp,bool is_agg)981 static void iwlagn_set_tx_status(struct iwl_priv *priv,
982 struct ieee80211_tx_info *info,
983 struct iwlagn_tx_resp *tx_resp,
984 bool is_agg)
985 {
986 u16 status = le16_to_cpu(tx_resp->status.status);
987
988 info->status.rates[0].count = tx_resp->failure_frame + 1;
989 if (is_agg)
990 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
991 info->flags |= iwl_tx_status_to_mac80211(status);
992 iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
993 info);
994 if (!iwl_is_tx_success(status))
995 iwlagn_count_tx_err_status(priv, status);
996 }
997
iwl_check_abort_status(struct iwl_priv * priv,u8 frame_count,u32 status)998 static void iwl_check_abort_status(struct iwl_priv *priv,
999 u8 frame_count, u32 status)
1000 {
1001 if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
1002 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
1003 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
1004 queue_work(priv->workqueue, &priv->tx_flush);
1005 }
1006 }
1007
iwlagn_rx_reply_tx(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb,struct iwl_device_cmd * cmd)1008 int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb,
1009 struct iwl_device_cmd *cmd)
1010 {
1011 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1012 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1013 int txq_id = SEQ_TO_QUEUE(sequence);
1014 int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
1015 struct iwlagn_tx_resp *tx_resp = (void *)pkt->data;
1016 struct ieee80211_hdr *hdr;
1017 u32 status = le16_to_cpu(tx_resp->status.status);
1018 u16 ssn = iwlagn_get_scd_ssn(tx_resp);
1019 int tid;
1020 int sta_id;
1021 int freed;
1022 struct ieee80211_tx_info *info;
1023 struct sk_buff_head skbs;
1024 struct sk_buff *skb;
1025 struct iwl_rxon_context *ctx;
1026 bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
1027
1028 tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
1029 IWLAGN_TX_RES_TID_POS;
1030 sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
1031 IWLAGN_TX_RES_RA_POS;
1032
1033 spin_lock(&priv->sta_lock);
1034
1035 if (is_agg)
1036 iwl_rx_reply_tx_agg(priv, tx_resp);
1037
1038 __skb_queue_head_init(&skbs);
1039
1040 if (tx_resp->frame_count == 1) {
1041 u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl);
1042 next_reclaimed = SEQ_TO_SN(next_reclaimed + 0x10);
1043
1044 if (is_agg) {
1045 /* If this is an aggregation queue, we can rely on the
1046 * ssn since the wifi sequence number corresponds to
1047 * the index in the TFD ring (%256).
1048 * The seq_ctl is the sequence control of the packet
1049 * to which this Tx response relates. But if there is a
1050 * hole in the bitmap of the BA we received, this Tx
1051 * response may allow to reclaim the hole and all the
1052 * subsequent packets that were already acked.
1053 * In that case, seq_ctl != ssn, and the next packet
1054 * to be reclaimed will be ssn and not seq_ctl.
1055 */
1056 next_reclaimed = ssn;
1057 }
1058
1059 if (tid != IWL_TID_NON_QOS) {
1060 priv->tid_data[sta_id][tid].next_reclaimed =
1061 next_reclaimed;
1062 IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d",
1063 next_reclaimed);
1064 }
1065
1066 /*we can free until ssn % q.n_bd not inclusive */
1067 WARN_ON(iwl_trans_reclaim(trans(priv), sta_id, tid,
1068 txq_id, ssn, &skbs));
1069 iwlagn_check_ratid_empty(priv, sta_id, tid);
1070 freed = 0;
1071
1072 /* process frames */
1073 skb_queue_walk(&skbs, skb) {
1074 hdr = (struct ieee80211_hdr *)skb->data;
1075
1076 if (!ieee80211_is_data_qos(hdr->frame_control))
1077 priv->last_seq_ctl = tx_resp->seq_ctl;
1078
1079 info = IEEE80211_SKB_CB(skb);
1080 ctx = info->driver_data[0];
1081 kmem_cache_free(iwl_tx_cmd_pool,
1082 (info->driver_data[1]));
1083
1084 memset(&info->status, 0, sizeof(info->status));
1085
1086 if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
1087 iwl_is_associated_ctx(ctx) && ctx->vif &&
1088 ctx->vif->type == NL80211_IFTYPE_STATION) {
1089 /* block and stop all queues */
1090 priv->passive_no_rx = true;
1091 IWL_DEBUG_TX_QUEUES(priv, "stop all queues: "
1092 "passive channel");
1093 ieee80211_stop_queues(priv->hw);
1094
1095 IWL_DEBUG_TX_REPLY(priv,
1096 "TXQ %d status %s (0x%08x) "
1097 "rate_n_flags 0x%x retries %d\n",
1098 txq_id,
1099 iwl_get_tx_fail_reason(status),
1100 status,
1101 le32_to_cpu(tx_resp->rate_n_flags),
1102 tx_resp->failure_frame);
1103
1104 IWL_DEBUG_TX_REPLY(priv,
1105 "FrameCnt = %d, idx=%d\n",
1106 tx_resp->frame_count, cmd_index);
1107 }
1108
1109 /* check if BAR is needed */
1110 if (is_agg && !iwl_is_tx_success(status))
1111 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1112 iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
1113 tx_resp, is_agg);
1114 if (!is_agg)
1115 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
1116
1117 freed++;
1118 }
1119
1120 WARN_ON(!is_agg && freed != 1);
1121 }
1122
1123 iwl_check_abort_status(priv, tx_resp->frame_count, status);
1124 spin_unlock(&priv->sta_lock);
1125
1126 while (!skb_queue_empty(&skbs)) {
1127 skb = __skb_dequeue(&skbs);
1128 ieee80211_tx_status(priv->hw, skb);
1129 }
1130
1131 return 0;
1132 }
1133
1134 /**
1135 * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1136 *
1137 * Handles block-acknowledge notification from device, which reports success
1138 * of frames sent via aggregation.
1139 */
iwlagn_rx_reply_compressed_ba(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb,struct iwl_device_cmd * cmd)1140 int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1141 struct iwl_rx_cmd_buffer *rxb,
1142 struct iwl_device_cmd *cmd)
1143 {
1144 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1145 struct iwl_compressed_ba_resp *ba_resp = (void *)pkt->data;
1146 struct iwl_ht_agg *agg;
1147 struct sk_buff_head reclaimed_skbs;
1148 struct ieee80211_tx_info *info;
1149 struct ieee80211_hdr *hdr;
1150 struct sk_buff *skb;
1151 int sta_id;
1152 int tid;
1153 int freed;
1154
1155 /* "flow" corresponds to Tx queue */
1156 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1157
1158 /* "ssn" is start of block-ack Tx window, corresponds to index
1159 * (in Tx queue's circular buffer) of first TFD/frame in window */
1160 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1161
1162 if (scd_flow >= cfg(priv)->base_params->num_of_queues) {
1163 IWL_ERR(priv,
1164 "BUG_ON scd_flow is bigger than number of queues\n");
1165 return 0;
1166 }
1167
1168 sta_id = ba_resp->sta_id;
1169 tid = ba_resp->tid;
1170 agg = &priv->tid_data[sta_id][tid].agg;
1171
1172 spin_lock(&priv->sta_lock);
1173
1174 if (unlikely(!agg->wait_for_ba)) {
1175 if (unlikely(ba_resp->bitmap))
1176 IWL_ERR(priv, "Received BA when not expected\n");
1177 spin_unlock(&priv->sta_lock);
1178 return 0;
1179 }
1180
1181 __skb_queue_head_init(&reclaimed_skbs);
1182
1183 /* Release all TFDs before the SSN, i.e. all TFDs in front of
1184 * block-ack window (we assume that they've been successfully
1185 * transmitted ... if not, it's too late anyway). */
1186 if (iwl_trans_reclaim(trans(priv), sta_id, tid, scd_flow,
1187 ba_resp_scd_ssn, &reclaimed_skbs)) {
1188 spin_unlock(&priv->sta_lock);
1189 return 0;
1190 }
1191
1192 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1193 "sta_id = %d\n",
1194 agg->wait_for_ba,
1195 (u8 *) &ba_resp->sta_addr_lo32,
1196 ba_resp->sta_id);
1197 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
1198 "scd_flow = %d, scd_ssn = %d\n",
1199 ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl),
1200 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1201 scd_flow, ba_resp_scd_ssn);
1202
1203 /* Mark that the expected block-ack response arrived */
1204 agg->wait_for_ba = false;
1205
1206 /* Sanity check values reported by uCode */
1207 if (ba_resp->txed_2_done > ba_resp->txed) {
1208 IWL_DEBUG_TX_REPLY(priv,
1209 "bogus sent(%d) and ack(%d) count\n",
1210 ba_resp->txed, ba_resp->txed_2_done);
1211 /*
1212 * set txed_2_done = txed,
1213 * so it won't impact rate scale
1214 */
1215 ba_resp->txed = ba_resp->txed_2_done;
1216 }
1217 IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
1218 ba_resp->txed, ba_resp->txed_2_done);
1219
1220 priv->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn;
1221
1222 iwlagn_check_ratid_empty(priv, sta_id, tid);
1223 freed = 0;
1224
1225 skb_queue_walk(&reclaimed_skbs, skb) {
1226 hdr = (struct ieee80211_hdr *)skb->data;
1227
1228 if (ieee80211_is_data_qos(hdr->frame_control))
1229 freed++;
1230 else
1231 WARN_ON_ONCE(1);
1232
1233 info = IEEE80211_SKB_CB(skb);
1234 kmem_cache_free(iwl_tx_cmd_pool, (info->driver_data[1]));
1235
1236 if (freed == 1) {
1237 /* this is the first skb we deliver in this batch */
1238 /* put the rate scaling data there */
1239 info = IEEE80211_SKB_CB(skb);
1240 memset(&info->status, 0, sizeof(info->status));
1241 info->flags |= IEEE80211_TX_STAT_ACK;
1242 info->flags |= IEEE80211_TX_STAT_AMPDU;
1243 info->status.ampdu_ack_len = ba_resp->txed_2_done;
1244 info->status.ampdu_len = ba_resp->txed;
1245 iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1246 info);
1247 }
1248 }
1249
1250 spin_unlock(&priv->sta_lock);
1251
1252 while (!skb_queue_empty(&reclaimed_skbs)) {
1253 skb = __skb_dequeue(&reclaimed_skbs);
1254 ieee80211_tx_status(priv->hw, skb);
1255 }
1256
1257 return 0;
1258 }
1259