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iwlagn: upper layer uses slabs to allocate tx cmds
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-tx.c
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2011 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-sta.h"
39 #include "iwl-io.h"
40 #include "iwl-helpers.h"
41 #include "iwl-agn-hw.h"
42 #include "iwl-agn.h"
43 #include "iwl-trans.h"
44
45 static inline int get_ac_from_tid(u16 tid)
46 {
47 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
48 return tid_to_ac[tid];
49
50 /* no support for TIDs 8-15 yet */
51 return -EINVAL;
52 }
53
54 static int iwlagn_txq_agg_enable(struct iwl_priv *priv, int txq_id, int sta_id,
55 int tid)
56 {
57 if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
58 (IWLAGN_FIRST_AMPDU_QUEUE +
59 hw_params(priv).num_ampdu_queues <= txq_id)) {
60 IWL_WARN(priv,
61 "queue number out of range: %d, must be %d to %d\n",
62 txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
63 IWLAGN_FIRST_AMPDU_QUEUE +
64 hw_params(priv).num_ampdu_queues - 1);
65 return -EINVAL;
66 }
67
68 /* Modify device's station table to Tx this TID */
69 return iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
70 }
71
72 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
73 struct ieee80211_tx_info *info,
74 __le16 fc, __le32 *tx_flags)
75 {
76 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
77 info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
78 info->flags & IEEE80211_TX_CTL_AMPDU)
79 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
80 }
81
82 /*
83 * handle build REPLY_TX command notification.
84 */
85 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
86 struct sk_buff *skb,
87 struct iwl_tx_cmd *tx_cmd,
88 struct ieee80211_tx_info *info,
89 struct ieee80211_hdr *hdr, u8 sta_id)
90 {
91 __le16 fc = hdr->frame_control;
92 __le32 tx_flags = tx_cmd->tx_flags;
93
94 tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
95
96 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
97 tx_flags |= TX_CMD_FLG_ACK_MSK;
98 else
99 tx_flags &= ~TX_CMD_FLG_ACK_MSK;
100
101 if (ieee80211_is_probe_resp(fc))
102 tx_flags |= TX_CMD_FLG_TSF_MSK;
103 else if (ieee80211_is_back_req(fc))
104 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
105 else if (info->band == IEEE80211_BAND_2GHZ &&
106 priv->cfg->bt_params &&
107 priv->cfg->bt_params->advanced_bt_coexist &&
108 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
109 ieee80211_is_reassoc_req(fc) ||
110 skb->protocol == cpu_to_be16(ETH_P_PAE)))
111 tx_flags |= TX_CMD_FLG_IGNORE_BT;
112
113
114 tx_cmd->sta_id = sta_id;
115 if (ieee80211_has_morefrags(fc))
116 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
117
118 if (ieee80211_is_data_qos(fc)) {
119 u8 *qc = ieee80211_get_qos_ctl(hdr);
120 tx_cmd->tid_tspec = qc[0] & 0xf;
121 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
122 } else {
123 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
124 }
125
126 iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
127
128 tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
129 if (ieee80211_is_mgmt(fc)) {
130 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
131 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
132 else
133 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
134 } else {
135 tx_cmd->timeout.pm_frame_timeout = 0;
136 }
137
138 tx_cmd->driver_txop = 0;
139 tx_cmd->tx_flags = tx_flags;
140 tx_cmd->next_frame_len = 0;
141 }
142
143 #define RTS_DFAULT_RETRY_LIMIT 60
144
145 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
146 struct iwl_tx_cmd *tx_cmd,
147 struct ieee80211_tx_info *info,
148 __le16 fc)
149 {
150 u32 rate_flags;
151 int rate_idx;
152 u8 rts_retry_limit;
153 u8 data_retry_limit;
154 u8 rate_plcp;
155
156 /* Set retry limit on DATA packets and Probe Responses*/
157 if (ieee80211_is_probe_resp(fc))
158 data_retry_limit = 3;
159 else
160 data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
161 tx_cmd->data_retry_limit = data_retry_limit;
162
163 /* Set retry limit on RTS packets */
164 rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
165 if (data_retry_limit < rts_retry_limit)
166 rts_retry_limit = data_retry_limit;
167 tx_cmd->rts_retry_limit = rts_retry_limit;
168
169 /* DATA packets will use the uCode station table for rate/antenna
170 * selection */
171 if (ieee80211_is_data(fc)) {
172 tx_cmd->initial_rate_index = 0;
173 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
174 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
175 if (priv->tm_fixed_rate) {
176 /*
177 * rate overwrite by testmode
178 * we not only send lq command to change rate
179 * we also re-enforce per data pkt base.
180 */
181 tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
182 memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
183 sizeof(tx_cmd->rate_n_flags));
184 }
185 #endif
186 return;
187 }
188
189 /**
190 * If the current TX rate stored in mac80211 has the MCS bit set, it's
191 * not really a TX rate. Thus, we use the lowest supported rate for
192 * this band. Also use the lowest supported rate if the stored rate
193 * index is invalid.
194 */
195 rate_idx = info->control.rates[0].idx;
196 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
197 (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
198 rate_idx = rate_lowest_index(&priv->bands[info->band],
199 info->control.sta);
200 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
201 if (info->band == IEEE80211_BAND_5GHZ)
202 rate_idx += IWL_FIRST_OFDM_RATE;
203 /* Get PLCP rate for tx_cmd->rate_n_flags */
204 rate_plcp = iwl_rates[rate_idx].plcp;
205 /* Zero out flags for this packet */
206 rate_flags = 0;
207
208 /* Set CCK flag as needed */
209 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
210 rate_flags |= RATE_MCS_CCK_MSK;
211
212 /* Set up antennas */
213 if (priv->cfg->bt_params &&
214 priv->cfg->bt_params->advanced_bt_coexist &&
215 priv->bt_full_concurrent) {
216 /* operated as 1x1 in full concurrency mode */
217 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
218 first_antenna(hw_params(priv).valid_tx_ant));
219 } else
220 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
221 hw_params(priv).valid_tx_ant);
222 rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
223
224 /* Set the rate in the TX cmd */
225 tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
226 }
227
228 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
229 struct ieee80211_tx_info *info,
230 struct iwl_tx_cmd *tx_cmd,
231 struct sk_buff *skb_frag,
232 int sta_id)
233 {
234 struct ieee80211_key_conf *keyconf = info->control.hw_key;
235
236 switch (keyconf->cipher) {
237 case WLAN_CIPHER_SUITE_CCMP:
238 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
239 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
240 if (info->flags & IEEE80211_TX_CTL_AMPDU)
241 tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
242 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
243 break;
244
245 case WLAN_CIPHER_SUITE_TKIP:
246 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
247 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
248 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
249 break;
250
251 case WLAN_CIPHER_SUITE_WEP104:
252 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
253 /* fall through */
254 case WLAN_CIPHER_SUITE_WEP40:
255 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
256 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
257
258 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
259
260 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
261 "with key %d\n", keyconf->keyidx);
262 break;
263
264 default:
265 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
266 break;
267 }
268 }
269
270 /*
271 * start REPLY_TX command process
272 */
273 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
274 {
275 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
276 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
277 struct iwl_station_priv *sta_priv = NULL;
278 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
279 struct iwl_device_cmd *dev_cmd = NULL;
280 struct iwl_tx_cmd *tx_cmd;
281 int txq_id;
282
283 u16 seq_number = 0;
284 __le16 fc;
285 u8 hdr_len;
286 u16 len;
287 u8 sta_id;
288 u8 tid = 0;
289 unsigned long flags;
290 bool is_agg = false;
291
292 if (info->control.vif)
293 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
294
295 spin_lock_irqsave(&priv->shrd->lock, flags);
296 if (iwl_is_rfkill(priv->shrd)) {
297 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
298 goto drop_unlock_priv;
299 }
300
301 fc = hdr->frame_control;
302
303 #ifdef CONFIG_IWLWIFI_DEBUG
304 if (ieee80211_is_auth(fc))
305 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
306 else if (ieee80211_is_assoc_req(fc))
307 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
308 else if (ieee80211_is_reassoc_req(fc))
309 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
310 #endif
311
312 hdr_len = ieee80211_hdrlen(fc);
313
314 /* For management frames use broadcast id to do not break aggregation */
315 if (!ieee80211_is_data(fc))
316 sta_id = ctx->bcast_sta_id;
317 else {
318 /* Find index into station table for destination station */
319 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
320 if (sta_id == IWL_INVALID_STATION) {
321 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
322 hdr->addr1);
323 goto drop_unlock_priv;
324 }
325 }
326
327 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
328
329 if (info->control.sta)
330 sta_priv = (void *)info->control.sta->drv_priv;
331
332 if (sta_priv && sta_priv->asleep &&
333 (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
334 /*
335 * This sends an asynchronous command to the device,
336 * but we can rely on it being processed before the
337 * next frame is processed -- and the next frame to
338 * this station is the one that will consume this
339 * counter.
340 * For now set the counter to just 1 since we do not
341 * support uAPSD yet.
342 */
343 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
344 }
345
346 /*
347 * Send this frame after DTIM -- there's a special queue
348 * reserved for this for contexts that support AP mode.
349 */
350 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
351 txq_id = ctx->mcast_queue;
352 /*
353 * The microcode will clear the more data
354 * bit in the last frame it transmits.
355 */
356 hdr->frame_control |=
357 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
358 } else if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
359 txq_id = IWL_AUX_QUEUE;
360 else
361 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
362
363 /* irqs already disabled/saved above when locking priv->shrd->lock */
364 spin_lock(&priv->shrd->sta_lock);
365
366 if (ieee80211_is_data_qos(fc)) {
367 u8 *qc = NULL;
368 struct iwl_tid_data *tid_data;
369 qc = ieee80211_get_qos_ctl(hdr);
370 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
371 tid_data = &priv->shrd->tid_data[sta_id][tid];
372
373 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
374 goto drop_unlock_sta;
375
376 seq_number = tid_data->seq_number;
377 seq_number &= IEEE80211_SCTL_SEQ;
378 hdr->seq_ctrl = hdr->seq_ctrl &
379 cpu_to_le16(IEEE80211_SCTL_FRAG);
380 hdr->seq_ctrl |= cpu_to_le16(seq_number);
381 seq_number += 0x10;
382 /* aggregation is on for this <sta,tid> */
383 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
384 tid_data->agg.state == IWL_AGG_ON) {
385 txq_id = tid_data->agg.txq_id;
386 is_agg = true;
387 }
388 }
389
390 dev_cmd = kmem_cache_alloc(priv->tx_cmd_pool, GFP_ATOMIC);
391
392 if (unlikely(!dev_cmd))
393 goto drop_unlock_sta;
394
395 memset(dev_cmd, 0, sizeof(*dev_cmd));
396 tx_cmd = &dev_cmd->cmd.tx;
397
398 /* Copy MAC header from skb into command buffer */
399 memcpy(tx_cmd->hdr, hdr, hdr_len);
400
401 /* Total # bytes to be transmitted */
402 len = (u16)skb->len;
403 tx_cmd->len = cpu_to_le16(len);
404
405 if (info->control.hw_key)
406 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
407
408 /* TODO need this for burst mode later on */
409 iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
410 iwl_dbg_log_tx_data_frame(priv, len, hdr);
411
412 iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
413
414 iwl_update_stats(priv, true, fc, len);
415
416 info->driver_data[0] = ctx;
417 info->driver_data[1] = dev_cmd;
418
419 if (iwl_trans_tx(trans(priv), skb, dev_cmd, txq_id, fc, is_agg))
420 goto drop_unlock_sta;
421
422 if (ieee80211_is_data_qos(fc)) {
423 priv->shrd->tid_data[sta_id][tid].tfds_in_queue++;
424 if (!ieee80211_has_morefrags(fc))
425 priv->shrd->tid_data[sta_id][tid].seq_number =
426 seq_number;
427 }
428
429 spin_unlock(&priv->shrd->sta_lock);
430 spin_unlock_irqrestore(&priv->shrd->lock, flags);
431
432 /*
433 * Avoid atomic ops if it isn't an associated client.
434 * Also, if this is a packet for aggregation, don't
435 * increase the counter because the ucode will stop
436 * aggregation queues when their respective station
437 * goes to sleep.
438 */
439 if (sta_priv && sta_priv->client && !is_agg)
440 atomic_inc(&sta_priv->pending_frames);
441
442 return 0;
443
444 drop_unlock_sta:
445 if (dev_cmd)
446 kmem_cache_free(priv->tx_cmd_pool, dev_cmd);
447 spin_unlock(&priv->shrd->sta_lock);
448 drop_unlock_priv:
449 spin_unlock_irqrestore(&priv->shrd->lock, flags);
450 return -1;
451 }
452
453 /*
454 * Find first available (lowest unused) Tx Queue, mark it "active".
455 * Called only when finding queue for aggregation.
456 * Should never return anything < 7, because they should already
457 * be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
458 */
459 static int iwlagn_txq_ctx_activate_free(struct iwl_priv *priv)
460 {
461 int txq_id;
462
463 for (txq_id = 0; txq_id < hw_params(priv).max_txq_num; txq_id++)
464 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
465 return txq_id;
466 return -1;
467 }
468
469 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
470 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
471 {
472 int sta_id;
473 int txq_id;
474 int ret;
475 unsigned long flags;
476 struct iwl_tid_data *tid_data;
477
478 IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
479 sta->addr, tid);
480
481 sta_id = iwl_sta_id(sta);
482 if (sta_id == IWL_INVALID_STATION) {
483 IWL_ERR(priv, "Start AGG on invalid station\n");
484 return -ENXIO;
485 }
486 if (unlikely(tid >= IWL_MAX_TID_COUNT))
487 return -EINVAL;
488
489 if (priv->shrd->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
490 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
491 return -ENXIO;
492 }
493
494 txq_id = iwlagn_txq_ctx_activate_free(priv);
495 if (txq_id == -1) {
496 IWL_ERR(priv, "No free aggregation queue available\n");
497 return -ENXIO;
498 }
499
500 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
501 tid_data = &priv->shrd->tid_data[sta_id][tid];
502 *ssn = SEQ_TO_SN(tid_data->seq_number);
503 tid_data->agg.txq_id = txq_id;
504 iwl_set_swq_id(&priv->txq[txq_id], get_ac_from_tid(tid), txq_id);
505 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
506
507 ret = iwlagn_txq_agg_enable(priv, txq_id, sta_id, tid);
508 if (ret)
509 return ret;
510
511 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
512 tid_data = &priv->shrd->tid_data[sta_id][tid];
513 if (tid_data->tfds_in_queue == 0) {
514 IWL_DEBUG_HT(priv, "HW queue is empty\n");
515 tid_data->agg.state = IWL_AGG_ON;
516 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
517 } else {
518 IWL_DEBUG_HT(priv, "HW queue is NOT empty: %d packets in HW queue\n",
519 tid_data->tfds_in_queue);
520 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
521 }
522 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
523 return ret;
524 }
525
526 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
527 struct ieee80211_sta *sta, u16 tid)
528 {
529 int txq_id, sta_id, ssn;
530 struct iwl_tid_data *tid_data;
531 int write_ptr, read_ptr;
532 unsigned long flags;
533
534 sta_id = iwl_sta_id(sta);
535
536 if (sta_id == IWL_INVALID_STATION) {
537 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
538 return -ENXIO;
539 }
540
541 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
542
543 tid_data = &priv->shrd->tid_data[sta_id][tid];
544 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
545 txq_id = tid_data->agg.txq_id;
546
547 switch (priv->shrd->tid_data[sta_id][tid].agg.state) {
548 case IWL_EMPTYING_HW_QUEUE_ADDBA:
549 /*
550 * This can happen if the peer stops aggregation
551 * again before we've had a chance to drain the
552 * queue we selected previously, i.e. before the
553 * session was really started completely.
554 */
555 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
556 goto turn_off;
557 case IWL_AGG_ON:
558 break;
559 default:
560 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
561 }
562
563 write_ptr = priv->txq[txq_id].q.write_ptr;
564 read_ptr = priv->txq[txq_id].q.read_ptr;
565
566 /* The queue is not empty */
567 if (write_ptr != read_ptr) {
568 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
569 priv->shrd->tid_data[sta_id][tid].agg.state =
570 IWL_EMPTYING_HW_QUEUE_DELBA;
571 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
572 return 0;
573 }
574
575 IWL_DEBUG_HT(priv, "HW queue is empty\n");
576 turn_off:
577 priv->shrd->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF;
578
579 /* do not restore/save irqs */
580 spin_unlock(&priv->shrd->sta_lock);
581 spin_lock(&priv->shrd->lock);
582
583 /*
584 * the only reason this call can fail is queue number out of range,
585 * which can happen if uCode is reloaded and all the station
586 * information are lost. if it is outside the range, there is no need
587 * to deactivate the uCode queue, just return "success" to allow
588 * mac80211 to clean up it own data.
589 */
590 iwl_trans_txq_agg_disable(trans(priv), txq_id);
591 spin_unlock_irqrestore(&priv->shrd->lock, flags);
592
593 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
594
595 return 0;
596 }
597
598 static int iwlagn_txq_check_empty(struct iwl_priv *priv,
599 int sta_id, u8 tid, int txq_id)
600 {
601 struct iwl_queue *q = &priv->txq[txq_id].q;
602 u8 *addr = priv->stations[sta_id].sta.sta.addr;
603 struct iwl_tid_data *tid_data = &priv->shrd->tid_data[sta_id][tid];
604 struct iwl_rxon_context *ctx;
605
606 ctx = &priv->contexts[priv->stations[sta_id].ctxid];
607
608 lockdep_assert_held(&priv->shrd->sta_lock);
609
610 switch (priv->shrd->tid_data[sta_id][tid].agg.state) {
611 case IWL_EMPTYING_HW_QUEUE_DELBA:
612 /* We are reclaiming the last packet of the */
613 /* aggregated HW queue */
614 if ((txq_id == tid_data->agg.txq_id) &&
615 (q->read_ptr == q->write_ptr)) {
616 IWL_DEBUG_HT(priv, "HW queue empty: continue DELBA flow\n");
617 iwl_trans_txq_agg_disable(trans(priv), txq_id);
618 tid_data->agg.state = IWL_AGG_OFF;
619 ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
620 }
621 break;
622 case IWL_EMPTYING_HW_QUEUE_ADDBA:
623 /* We are reclaiming the last packet of the queue */
624 if (tid_data->tfds_in_queue == 0) {
625 IWL_DEBUG_HT(priv, "HW queue empty: continue ADDBA flow\n");
626 tid_data->agg.state = IWL_AGG_ON;
627 ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
628 }
629 break;
630 }
631
632 return 0;
633 }
634
635 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
636 struct iwl_rxon_context *ctx,
637 const u8 *addr1)
638 {
639 struct ieee80211_sta *sta;
640 struct iwl_station_priv *sta_priv;
641
642 rcu_read_lock();
643 sta = ieee80211_find_sta(ctx->vif, addr1);
644 if (sta) {
645 sta_priv = (void *)sta->drv_priv;
646 /* avoid atomic ops if this isn't a client */
647 if (sta_priv->client &&
648 atomic_dec_return(&sta_priv->pending_frames) == 0)
649 ieee80211_sta_block_awake(priv->hw, sta, false);
650 }
651 rcu_read_unlock();
652 }
653
654 /**
655 * translate ucode response to mac80211 tx status control values
656 */
657 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
658 struct ieee80211_tx_info *info)
659 {
660 struct ieee80211_tx_rate *r = &info->control.rates[0];
661
662 info->antenna_sel_tx =
663 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
664 if (rate_n_flags & RATE_MCS_HT_MSK)
665 r->flags |= IEEE80211_TX_RC_MCS;
666 if (rate_n_flags & RATE_MCS_GF_MSK)
667 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
668 if (rate_n_flags & RATE_MCS_HT40_MSK)
669 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
670 if (rate_n_flags & RATE_MCS_DUP_MSK)
671 r->flags |= IEEE80211_TX_RC_DUP_DATA;
672 if (rate_n_flags & RATE_MCS_SGI_MSK)
673 r->flags |= IEEE80211_TX_RC_SHORT_GI;
674 r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
675 }
676
677 #ifdef CONFIG_IWLWIFI_DEBUG
678 const char *iwl_get_tx_fail_reason(u32 status)
679 {
680 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
681 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
682
683 switch (status & TX_STATUS_MSK) {
684 case TX_STATUS_SUCCESS:
685 return "SUCCESS";
686 TX_STATUS_POSTPONE(DELAY);
687 TX_STATUS_POSTPONE(FEW_BYTES);
688 TX_STATUS_POSTPONE(BT_PRIO);
689 TX_STATUS_POSTPONE(QUIET_PERIOD);
690 TX_STATUS_POSTPONE(CALC_TTAK);
691 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
692 TX_STATUS_FAIL(SHORT_LIMIT);
693 TX_STATUS_FAIL(LONG_LIMIT);
694 TX_STATUS_FAIL(FIFO_UNDERRUN);
695 TX_STATUS_FAIL(DRAIN_FLOW);
696 TX_STATUS_FAIL(RFKILL_FLUSH);
697 TX_STATUS_FAIL(LIFE_EXPIRE);
698 TX_STATUS_FAIL(DEST_PS);
699 TX_STATUS_FAIL(HOST_ABORTED);
700 TX_STATUS_FAIL(BT_RETRY);
701 TX_STATUS_FAIL(STA_INVALID);
702 TX_STATUS_FAIL(FRAG_DROPPED);
703 TX_STATUS_FAIL(TID_DISABLE);
704 TX_STATUS_FAIL(FIFO_FLUSHED);
705 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
706 TX_STATUS_FAIL(PASSIVE_NO_RX);
707 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
708 }
709
710 return "UNKNOWN";
711
712 #undef TX_STATUS_FAIL
713 #undef TX_STATUS_POSTPONE
714 }
715 #endif /* CONFIG_IWLWIFI_DEBUG */
716
717 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
718 {
719 status &= AGG_TX_STATUS_MSK;
720
721 switch (status) {
722 case AGG_TX_STATE_UNDERRUN_MSK:
723 priv->reply_agg_tx_stats.underrun++;
724 break;
725 case AGG_TX_STATE_BT_PRIO_MSK:
726 priv->reply_agg_tx_stats.bt_prio++;
727 break;
728 case AGG_TX_STATE_FEW_BYTES_MSK:
729 priv->reply_agg_tx_stats.few_bytes++;
730 break;
731 case AGG_TX_STATE_ABORT_MSK:
732 priv->reply_agg_tx_stats.abort++;
733 break;
734 case AGG_TX_STATE_LAST_SENT_TTL_MSK:
735 priv->reply_agg_tx_stats.last_sent_ttl++;
736 break;
737 case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
738 priv->reply_agg_tx_stats.last_sent_try++;
739 break;
740 case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
741 priv->reply_agg_tx_stats.last_sent_bt_kill++;
742 break;
743 case AGG_TX_STATE_SCD_QUERY_MSK:
744 priv->reply_agg_tx_stats.scd_query++;
745 break;
746 case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
747 priv->reply_agg_tx_stats.bad_crc32++;
748 break;
749 case AGG_TX_STATE_RESPONSE_MSK:
750 priv->reply_agg_tx_stats.response++;
751 break;
752 case AGG_TX_STATE_DUMP_TX_MSK:
753 priv->reply_agg_tx_stats.dump_tx++;
754 break;
755 case AGG_TX_STATE_DELAY_TX_MSK:
756 priv->reply_agg_tx_stats.delay_tx++;
757 break;
758 default:
759 priv->reply_agg_tx_stats.unknown++;
760 break;
761 }
762 }
763
764 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
765 struct iwlagn_tx_resp *tx_resp)
766 {
767 struct agg_tx_status *frame_status = &tx_resp->status;
768 int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
769 IWLAGN_TX_RES_TID_POS;
770 int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
771 IWLAGN_TX_RES_RA_POS;
772 struct iwl_ht_agg *agg = &priv->shrd->tid_data[sta_id][tid].agg;
773 u32 status = le16_to_cpu(tx_resp->status.status);
774 int i;
775
776 if (agg->wait_for_ba)
777 IWL_DEBUG_TX_REPLY(priv,
778 "got tx response w/o block-ack\n");
779
780 agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
781 agg->wait_for_ba = (tx_resp->frame_count > 1);
782
783 /*
784 * If the BT kill count is non-zero, we'll get this
785 * notification again.
786 */
787 if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
788 priv->cfg->bt_params &&
789 priv->cfg->bt_params->advanced_bt_coexist) {
790 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
791 }
792
793 /* Construct bit-map of pending frames within Tx window */
794 for (i = 0; i < tx_resp->frame_count; i++) {
795 u16 fstatus = le16_to_cpu(frame_status[i].status);
796
797 if (status & AGG_TX_STATUS_MSK)
798 iwlagn_count_agg_tx_err_status(priv, fstatus);
799
800 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
801 AGG_TX_STATE_ABORT_MSK))
802 continue;
803
804 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
805 "try-count (0x%08x)\n",
806 iwl_get_agg_tx_fail_reason(fstatus),
807 fstatus & AGG_TX_STATUS_MSK,
808 fstatus & AGG_TX_TRY_MSK);
809 }
810 }
811
812 #ifdef CONFIG_IWLWIFI_DEBUG
813 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
814
815 const char *iwl_get_agg_tx_fail_reason(u16 status)
816 {
817 status &= AGG_TX_STATUS_MSK;
818 switch (status) {
819 case AGG_TX_STATE_TRANSMITTED:
820 return "SUCCESS";
821 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
822 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
823 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
824 AGG_TX_STATE_FAIL(ABORT_MSK);
825 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
826 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
827 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
828 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
829 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
830 AGG_TX_STATE_FAIL(RESPONSE_MSK);
831 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
832 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
833 }
834
835 return "UNKNOWN";
836 }
837 #endif /* CONFIG_IWLWIFI_DEBUG */
838
839 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
840 {
841 return le32_to_cpup((__le32 *)&tx_resp->status +
842 tx_resp->frame_count) & MAX_SN;
843 }
844
845 static void iwl_free_tfds_in_queue(struct iwl_priv *priv,
846 int sta_id, int tid, int freed)
847 {
848 lockdep_assert_held(&priv->shrd->sta_lock);
849
850 if (priv->shrd->tid_data[sta_id][tid].tfds_in_queue >= freed)
851 priv->shrd->tid_data[sta_id][tid].tfds_in_queue -= freed;
852 else {
853 IWL_DEBUG_TX(priv, "free more than tfds_in_queue (%u:%d)\n",
854 priv->shrd->tid_data[sta_id][tid].tfds_in_queue,
855 freed);
856 priv->shrd->tid_data[sta_id][tid].tfds_in_queue = 0;
857 }
858 }
859
860 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
861 {
862 status &= TX_STATUS_MSK;
863
864 switch (status) {
865 case TX_STATUS_POSTPONE_DELAY:
866 priv->reply_tx_stats.pp_delay++;
867 break;
868 case TX_STATUS_POSTPONE_FEW_BYTES:
869 priv->reply_tx_stats.pp_few_bytes++;
870 break;
871 case TX_STATUS_POSTPONE_BT_PRIO:
872 priv->reply_tx_stats.pp_bt_prio++;
873 break;
874 case TX_STATUS_POSTPONE_QUIET_PERIOD:
875 priv->reply_tx_stats.pp_quiet_period++;
876 break;
877 case TX_STATUS_POSTPONE_CALC_TTAK:
878 priv->reply_tx_stats.pp_calc_ttak++;
879 break;
880 case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
881 priv->reply_tx_stats.int_crossed_retry++;
882 break;
883 case TX_STATUS_FAIL_SHORT_LIMIT:
884 priv->reply_tx_stats.short_limit++;
885 break;
886 case TX_STATUS_FAIL_LONG_LIMIT:
887 priv->reply_tx_stats.long_limit++;
888 break;
889 case TX_STATUS_FAIL_FIFO_UNDERRUN:
890 priv->reply_tx_stats.fifo_underrun++;
891 break;
892 case TX_STATUS_FAIL_DRAIN_FLOW:
893 priv->reply_tx_stats.drain_flow++;
894 break;
895 case TX_STATUS_FAIL_RFKILL_FLUSH:
896 priv->reply_tx_stats.rfkill_flush++;
897 break;
898 case TX_STATUS_FAIL_LIFE_EXPIRE:
899 priv->reply_tx_stats.life_expire++;
900 break;
901 case TX_STATUS_FAIL_DEST_PS:
902 priv->reply_tx_stats.dest_ps++;
903 break;
904 case TX_STATUS_FAIL_HOST_ABORTED:
905 priv->reply_tx_stats.host_abort++;
906 break;
907 case TX_STATUS_FAIL_BT_RETRY:
908 priv->reply_tx_stats.bt_retry++;
909 break;
910 case TX_STATUS_FAIL_STA_INVALID:
911 priv->reply_tx_stats.sta_invalid++;
912 break;
913 case TX_STATUS_FAIL_FRAG_DROPPED:
914 priv->reply_tx_stats.frag_drop++;
915 break;
916 case TX_STATUS_FAIL_TID_DISABLE:
917 priv->reply_tx_stats.tid_disable++;
918 break;
919 case TX_STATUS_FAIL_FIFO_FLUSHED:
920 priv->reply_tx_stats.fifo_flush++;
921 break;
922 case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
923 priv->reply_tx_stats.insuff_cf_poll++;
924 break;
925 case TX_STATUS_FAIL_PASSIVE_NO_RX:
926 priv->reply_tx_stats.fail_hw_drop++;
927 break;
928 case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
929 priv->reply_tx_stats.sta_color_mismatch++;
930 break;
931 default:
932 priv->reply_tx_stats.unknown++;
933 break;
934 }
935 }
936
937 static void iwlagn_set_tx_status(struct iwl_priv *priv,
938 struct ieee80211_tx_info *info,
939 struct iwlagn_tx_resp *tx_resp,
940 bool is_agg)
941 {
942 u16 status = le16_to_cpu(tx_resp->status.status);
943
944 info->status.rates[0].count = tx_resp->failure_frame + 1;
945 if (is_agg)
946 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
947 info->flags |= iwl_tx_status_to_mac80211(status);
948 iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
949 info);
950 if (!iwl_is_tx_success(status))
951 iwlagn_count_tx_err_status(priv, status);
952 }
953
954 static void iwl_check_abort_status(struct iwl_priv *priv,
955 u8 frame_count, u32 status)
956 {
957 if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
958 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
959 if (!test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
960 queue_work(priv->shrd->workqueue, &priv->tx_flush);
961 }
962 }
963
964 void iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
965 {
966 struct iwl_rx_packet *pkt = rxb_addr(rxb);
967 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
968 int txq_id = SEQ_TO_QUEUE(sequence);
969 int cmd_index = SEQ_TO_INDEX(sequence);
970 struct iwl_tx_queue *txq = &priv->txq[txq_id];
971 struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
972 struct ieee80211_hdr *hdr;
973 u32 status = le16_to_cpu(tx_resp->status.status);
974 u32 ssn = iwlagn_get_scd_ssn(tx_resp);
975 int tid;
976 int sta_id;
977 int freed;
978 struct ieee80211_tx_info *info;
979 unsigned long flags;
980 struct sk_buff_head skbs;
981 struct sk_buff *skb;
982 struct iwl_rxon_context *ctx;
983
984 if ((cmd_index >= txq->q.n_bd) ||
985 (iwl_queue_used(&txq->q, cmd_index) == 0)) {
986 IWL_ERR(priv, "%s: Read index for DMA queue txq_id (%d) "
987 "cmd_index %d is out of range [0-%d] %d %d\n",
988 __func__, txq_id, cmd_index, txq->q.n_bd,
989 txq->q.write_ptr, txq->q.read_ptr);
990 return;
991 }
992
993 txq->time_stamp = jiffies;
994
995 tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
996 IWLAGN_TX_RES_TID_POS;
997 sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
998 IWLAGN_TX_RES_RA_POS;
999
1000 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1001
1002 if (txq->sched_retry)
1003 iwl_rx_reply_tx_agg(priv, tx_resp);
1004
1005 if (tx_resp->frame_count == 1) {
1006 bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
1007
1008 __skb_queue_head_init(&skbs);
1009 /*we can free until ssn % q.n_bd not inclusive */
1010 iwl_trans_reclaim(trans(priv), txq_id, ssn, status, &skbs);
1011 freed = 0;
1012 while (!skb_queue_empty(&skbs)) {
1013 skb = __skb_dequeue(&skbs);
1014 hdr = (struct ieee80211_hdr *)skb->data;
1015
1016 if (!ieee80211_is_data_qos(hdr->frame_control))
1017 priv->last_seq_ctl = tx_resp->seq_ctl;
1018
1019 info = IEEE80211_SKB_CB(skb);
1020 ctx = info->driver_data[0];
1021 kmem_cache_free(priv->tx_cmd_pool,
1022 (info->driver_data[1]));
1023
1024 memset(&info->status, 0, sizeof(info->status));
1025
1026 if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
1027 iwl_is_associated_ctx(ctx) && ctx->vif &&
1028 ctx->vif->type == NL80211_IFTYPE_STATION) {
1029 ctx->last_tx_rejected = true;
1030 iwl_stop_queue(priv, &priv->txq[txq_id]);
1031
1032 IWL_DEBUG_TX_REPLY(priv,
1033 "TXQ %d status %s (0x%08x) "
1034 "rate_n_flags 0x%x retries %d\n",
1035 txq_id,
1036 iwl_get_tx_fail_reason(status),
1037 status,
1038 le32_to_cpu(tx_resp->rate_n_flags),
1039 tx_resp->failure_frame);
1040
1041 IWL_DEBUG_TX_REPLY(priv,
1042 "FrameCnt = %d, idx=%d\n",
1043 tx_resp->frame_count, cmd_index);
1044 }
1045
1046 /* check if BAR is needed */
1047 if (is_agg && !iwl_is_tx_success(status))
1048 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1049 iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
1050 tx_resp, is_agg);
1051 if (!is_agg)
1052 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
1053
1054 ieee80211_tx_status_irqsafe(priv->hw, skb);
1055
1056 freed++;
1057 }
1058
1059 WARN_ON(!is_agg && freed != 1);
1060
1061 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
1062 iwlagn_txq_check_empty(priv, sta_id, tid, txq_id);
1063 }
1064
1065 iwl_check_abort_status(priv, tx_resp->frame_count, status);
1066 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1067 }
1068
1069 /**
1070 * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1071 *
1072 * Handles block-acknowledge notification from device, which reports success
1073 * of frames sent via aggregation.
1074 */
1075 void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1076 struct iwl_rx_mem_buffer *rxb)
1077 {
1078 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1079 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1080 struct iwl_tx_queue *txq = NULL;
1081 struct iwl_ht_agg *agg;
1082 struct sk_buff_head reclaimed_skbs;
1083 struct ieee80211_tx_info *info;
1084 struct ieee80211_hdr *hdr;
1085 struct sk_buff *skb;
1086 unsigned long flags;
1087 int index;
1088 int sta_id;
1089 int tid;
1090 int freed;
1091
1092 /* "flow" corresponds to Tx queue */
1093 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1094
1095 /* "ssn" is start of block-ack Tx window, corresponds to index
1096 * (in Tx queue's circular buffer) of first TFD/frame in window */
1097 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1098
1099 if (scd_flow >= hw_params(priv).max_txq_num) {
1100 IWL_ERR(priv,
1101 "BUG_ON scd_flow is bigger than number of queues\n");
1102 return;
1103 }
1104
1105 txq = &priv->txq[scd_flow];
1106 sta_id = ba_resp->sta_id;
1107 tid = ba_resp->tid;
1108 agg = &priv->shrd->tid_data[sta_id][tid].agg;
1109
1110 /* Find index of block-ack window */
1111 index = ba_resp_scd_ssn & (txq->q.n_bd - 1);
1112
1113 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1114
1115 if (unlikely(agg->txq_id != scd_flow)) {
1116 /*
1117 * FIXME: this is a uCode bug which need to be addressed,
1118 * log the information and return for now!
1119 * since it is possible happen very often and in order
1120 * not to fill the syslog, don't enable the logging by default
1121 */
1122 IWL_DEBUG_TX_REPLY(priv,
1123 "BA scd_flow %d does not match txq_id %d\n",
1124 scd_flow, agg->txq_id);
1125 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1126 return;
1127 }
1128
1129 if (unlikely(!agg->wait_for_ba)) {
1130 if (unlikely(ba_resp->bitmap))
1131 IWL_ERR(priv, "Received BA when not expected\n");
1132 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1133 return;
1134 }
1135
1136 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1137 "sta_id = %d\n",
1138 agg->wait_for_ba,
1139 (u8 *) &ba_resp->sta_addr_lo32,
1140 ba_resp->sta_id);
1141 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
1142 "scd_flow = %d, scd_ssn = %d\n",
1143 ba_resp->tid,
1144 ba_resp->seq_ctl,
1145 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1146 ba_resp->scd_flow,
1147 ba_resp->scd_ssn);
1148
1149 /* Mark that the expected block-ack response arrived */
1150 agg->wait_for_ba = 0;
1151
1152 /* Sanity check values reported by uCode */
1153 if (ba_resp->txed_2_done > ba_resp->txed) {
1154 IWL_DEBUG_TX_REPLY(priv,
1155 "bogus sent(%d) and ack(%d) count\n",
1156 ba_resp->txed, ba_resp->txed_2_done);
1157 /*
1158 * set txed_2_done = txed,
1159 * so it won't impact rate scale
1160 */
1161 ba_resp->txed = ba_resp->txed_2_done;
1162 }
1163 IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
1164 ba_resp->txed, ba_resp->txed_2_done);
1165
1166 __skb_queue_head_init(&reclaimed_skbs);
1167
1168 /* Release all TFDs before the SSN, i.e. all TFDs in front of
1169 * block-ack window (we assume that they've been successfully
1170 * transmitted ... if not, it's too late anyway). */
1171 iwl_trans_reclaim(trans(priv), scd_flow, ba_resp_scd_ssn, 0,
1172 &reclaimed_skbs);
1173 freed = 0;
1174 while (!skb_queue_empty(&reclaimed_skbs)) {
1175
1176 skb = __skb_dequeue(&reclaimed_skbs);
1177 hdr = (struct ieee80211_hdr *)skb->data;
1178
1179 if (ieee80211_is_data_qos(hdr->frame_control))
1180 freed++;
1181 else
1182 WARN_ON_ONCE(1);
1183
1184 if (freed == 0) {
1185 /* this is the first skb we deliver in this batch */
1186 /* put the rate scaling data there */
1187 info = IEEE80211_SKB_CB(skb);
1188 memset(&info->status, 0, sizeof(info->status));
1189 info->flags |= IEEE80211_TX_STAT_ACK;
1190 info->flags |= IEEE80211_TX_STAT_AMPDU;
1191 info->status.ampdu_ack_len = ba_resp->txed_2_done;
1192 info->status.ampdu_len = ba_resp->txed;
1193 iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1194 info);
1195 }
1196
1197 info = IEEE80211_SKB_CB(skb);
1198 kmem_cache_free(priv->tx_cmd_pool, (info->driver_data[1]));
1199
1200 ieee80211_tx_status_irqsafe(priv->hw, skb);
1201 }
1202
1203 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
1204 iwlagn_txq_check_empty(priv, sta_id, tid, scd_flow);
1205
1206 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1207 }
Linux kernel - Deliverables
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