Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless
[~shefty/rdma-dev.git] / drivers / net / wireless / iwlwifi / iwl-agn-tx.c
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
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  */
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
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->shrd->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
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                                       int sta_id)
215 {
216         struct ieee80211_key_conf *keyconf = info->control.hw_key;
217
218         switch (keyconf->cipher) {
219         case WLAN_CIPHER_SUITE_CCMP:
220                 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
221                 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
222                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
223                         tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
224                 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
225                 break;
226
227         case WLAN_CIPHER_SUITE_TKIP:
228                 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
229                 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
230                 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
231                 break;
232
233         case WLAN_CIPHER_SUITE_WEP104:
234                 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
235                 /* fall through */
236         case WLAN_CIPHER_SUITE_WEP40:
237                 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
238                         (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
239
240                 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
241
242                 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
243                              "with key %d\n", keyconf->keyidx);
244                 break;
245
246         default:
247                 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
248                 break;
249         }
250 }
251
252 /*
253  * start REPLY_TX command process
254  */
255 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
256 {
257         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
258         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
259         struct iwl_station_priv *sta_priv = NULL;
260         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
261         struct iwl_device_cmd *dev_cmd = NULL;
262         struct iwl_tx_cmd *tx_cmd;
263
264         __le16 fc;
265         u8 hdr_len;
266         u16 len, seq_number = 0;
267         u8 sta_id, tid = IWL_MAX_TID_COUNT;
268         unsigned long flags;
269         bool is_agg = false;
270
271         if (info->control.vif)
272                 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
273
274         spin_lock_irqsave(&priv->shrd->lock, flags);
275         if (iwl_is_rfkill(priv->shrd)) {
276                 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
277                 goto drop_unlock_priv;
278         }
279
280         fc = hdr->frame_control;
281
282 #ifdef CONFIG_IWLWIFI_DEBUG
283         if (ieee80211_is_auth(fc))
284                 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
285         else if (ieee80211_is_assoc_req(fc))
286                 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
287         else if (ieee80211_is_reassoc_req(fc))
288                 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
289 #endif
290
291         if (unlikely(ieee80211_is_probe_resp(fc))) {
292                 struct iwl_wipan_noa_data *noa_data =
293                         rcu_dereference(priv->noa_data);
294
295                 if (noa_data &&
296                     pskb_expand_head(skb, 0, noa_data->length,
297                                      GFP_ATOMIC) == 0) {
298                         memcpy(skb_put(skb, noa_data->length),
299                                noa_data->data, noa_data->length);
300                         hdr = (struct ieee80211_hdr *)skb->data;
301                 }
302         }
303
304         hdr_len = ieee80211_hdrlen(fc);
305
306         /* For management frames use broadcast id to do not break aggregation */
307         if (!ieee80211_is_data(fc))
308                 sta_id = ctx->bcast_sta_id;
309         else {
310                 /* Find index into station table for destination station */
311                 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
312                 if (sta_id == IWL_INVALID_STATION) {
313                         IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
314                                        hdr->addr1);
315                         goto drop_unlock_priv;
316                 }
317         }
318
319         IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
320
321         if (info->control.sta)
322                 sta_priv = (void *)info->control.sta->drv_priv;
323
324         if (sta_priv && sta_priv->asleep &&
325             (info->flags & IEEE80211_TX_CTL_POLL_RESPONSE)) {
326                 /*
327                  * This sends an asynchronous command to the device,
328                  * but we can rely on it being processed before the
329                  * next frame is processed -- and the next frame to
330                  * this station is the one that will consume this
331                  * counter.
332                  * For now set the counter to just 1 since we do not
333                  * support uAPSD yet.
334                  */
335                 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
336         }
337
338         if (info->flags & IEEE80211_TX_CTL_AMPDU)
339                 is_agg = true;
340
341         /* irqs already disabled/saved above when locking priv->shrd->lock */
342         spin_lock(&priv->shrd->sta_lock);
343
344         dev_cmd = kmem_cache_alloc(priv->tx_cmd_pool, GFP_ATOMIC);
345
346         if (unlikely(!dev_cmd))
347                 goto drop_unlock_sta;
348
349         memset(dev_cmd, 0, sizeof(*dev_cmd));
350         tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
351
352         /* Total # bytes to be transmitted */
353         len = (u16)skb->len;
354         tx_cmd->len = cpu_to_le16(len);
355
356         if (info->control.hw_key)
357                 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
358
359         /* TODO need this for burst mode later on */
360         iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
361         iwl_dbg_log_tx_data_frame(priv, len, hdr);
362
363         iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
364
365         iwl_update_stats(priv, true, fc, len);
366
367         memset(&info->status, 0, sizeof(info->status));
368
369         info->driver_data[0] = ctx;
370         info->driver_data[1] = dev_cmd;
371
372         if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
373                 u8 *qc = NULL;
374                 struct iwl_tid_data *tid_data;
375                 qc = ieee80211_get_qos_ctl(hdr);
376                 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
377                 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
378                         goto drop_unlock_sta;
379                 tid_data = &priv->tid_data[sta_id][tid];
380
381                 /* aggregation is on for this <sta,tid> */
382                 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
383                     tid_data->agg.state != IWL_AGG_ON) {
384                         IWL_ERR(priv, "TX_CTL_AMPDU while not in AGG:"
385                                 " Tx flags = 0x%08x, agg.state = %d",
386                                 info->flags, tid_data->agg.state);
387                         IWL_ERR(priv, "sta_id = %d, tid = %d seq_num = %d",
388                                 sta_id, tid, SEQ_TO_SN(tid_data->seq_number));
389                         goto drop_unlock_sta;
390                 }
391
392                 /* We can receive packets from the stack in IWL_AGG_{ON,OFF}
393                  * only. Check this here.
394                  */
395                 if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON &&
396                     tid_data->agg.state != IWL_AGG_OFF,
397                     "Tx while agg.state = %d", tid_data->agg.state))
398                         goto drop_unlock_sta;
399
400                 seq_number = tid_data->seq_number;
401                 seq_number &= IEEE80211_SCTL_SEQ;
402                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
403                 hdr->seq_ctrl |= cpu_to_le16(seq_number);
404                 seq_number += 0x10;
405         }
406
407         /* Copy MAC header from skb into command buffer */
408         memcpy(tx_cmd->hdr, hdr, hdr_len);
409
410         if (iwl_trans_tx(trans(priv), skb, dev_cmd, ctx->ctxid, sta_id, tid))
411                 goto drop_unlock_sta;
412
413         if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc) &&
414             !ieee80211_has_morefrags(fc))
415                 priv->tid_data[sta_id][tid].seq_number = seq_number;
416
417         spin_unlock(&priv->shrd->sta_lock);
418         spin_unlock_irqrestore(&priv->shrd->lock, flags);
419
420         /*
421          * Avoid atomic ops if it isn't an associated client.
422          * Also, if this is a packet for aggregation, don't
423          * increase the counter because the ucode will stop
424          * aggregation queues when their respective station
425          * goes to sleep.
426          */
427         if (sta_priv && sta_priv->client && !is_agg)
428                 atomic_inc(&sta_priv->pending_frames);
429
430         return 0;
431
432 drop_unlock_sta:
433         if (dev_cmd)
434                 kmem_cache_free(priv->tx_cmd_pool, dev_cmd);
435         spin_unlock(&priv->shrd->sta_lock);
436 drop_unlock_priv:
437         spin_unlock_irqrestore(&priv->shrd->lock, flags);
438         return -1;
439 }
440
441 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
442                         struct ieee80211_sta *sta, u16 tid)
443 {
444         struct iwl_tid_data *tid_data;
445         unsigned long flags;
446         int sta_id;
447
448         sta_id = iwl_sta_id(sta);
449
450         if (sta_id == IWL_INVALID_STATION) {
451                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
452                 return -ENXIO;
453         }
454
455         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
456
457         tid_data = &priv->tid_data[sta_id][tid];
458
459         switch (priv->tid_data[sta_id][tid].agg.state) {
460         case IWL_EMPTYING_HW_QUEUE_ADDBA:
461                 /*
462                 * This can happen if the peer stops aggregation
463                 * again before we've had a chance to drain the
464                 * queue we selected previously, i.e. before the
465                 * session was really started completely.
466                 */
467                 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
468                 goto turn_off;
469         case IWL_AGG_ON:
470                 break;
471         default:
472                 IWL_WARN(priv, "Stopping AGG while state not ON "
473                          "or starting for %d on %d (%d)\n", sta_id, tid,
474                          priv->tid_data[sta_id][tid].agg.state);
475                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
476                 return 0;
477         }
478
479         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
480
481         /* There are still packets for this RA / TID in the HW */
482         if (tid_data->agg.ssn != tid_data->next_reclaimed) {
483                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
484                                     "next_recl = %d",
485                                     tid_data->agg.ssn,
486                                     tid_data->next_reclaimed);
487                 priv->tid_data[sta_id][tid].agg.state =
488                         IWL_EMPTYING_HW_QUEUE_DELBA;
489                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
490                 return 0;
491         }
492
493         IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
494                             tid_data->agg.ssn);
495 turn_off:
496         priv->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF;
497
498         /* do not restore/save irqs */
499         spin_unlock(&priv->shrd->sta_lock);
500         spin_lock(&priv->shrd->lock);
501
502         iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
503
504         spin_unlock_irqrestore(&priv->shrd->lock, flags);
505
506         ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
507
508         return 0;
509 }
510
511 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
512                         struct ieee80211_sta *sta, u16 tid, u16 *ssn)
513 {
514         struct iwl_tid_data *tid_data;
515         unsigned long flags;
516         int sta_id;
517         int ret;
518
519         IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
520                      sta->addr, tid);
521
522         sta_id = iwl_sta_id(sta);
523         if (sta_id == IWL_INVALID_STATION) {
524                 IWL_ERR(priv, "Start AGG on invalid station\n");
525                 return -ENXIO;
526         }
527         if (unlikely(tid >= IWL_MAX_TID_COUNT))
528                 return -EINVAL;
529
530         if (priv->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
531                 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
532                 return -ENXIO;
533         }
534
535         ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
536         if (ret)
537                 return ret;
538
539         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
540
541         tid_data = &priv->tid_data[sta_id][tid];
542         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
543
544         *ssn = tid_data->agg.ssn;
545
546         ret = iwl_trans_tx_agg_alloc(trans(priv), sta_id, tid);
547         if (ret) {
548                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
549                 return ret;
550         }
551
552         if (*ssn == tid_data->next_reclaimed) {
553                 IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
554                                     tid_data->agg.ssn);
555                 tid_data->agg.state = IWL_AGG_ON;
556                 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
557         } else {
558                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
559                                     "next_reclaimed = %d",
560                                     tid_data->agg.ssn,
561                                     tid_data->next_reclaimed);
562                 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
563         }
564
565         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
566
567         return ret;
568 }
569
570 int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif,
571                         struct ieee80211_sta *sta, u16 tid, u8 buf_size)
572 {
573         struct iwl_station_priv *sta_priv = (void *) sta->drv_priv;
574         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
575         unsigned long flags;
576         u16 ssn;
577
578         buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
579
580         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
581         ssn = priv->tid_data[sta_priv->sta_id][tid].agg.ssn;
582         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
583
584         iwl_trans_tx_agg_setup(trans(priv), ctx->ctxid, sta_priv->sta_id, tid,
585                                buf_size, ssn);
586
587         /*
588          * If the limit is 0, then it wasn't initialised yet,
589          * use the default. We can do that since we take the
590          * minimum below, and we don't want to go above our
591          * default due to hardware restrictions.
592          */
593         if (sta_priv->max_agg_bufsize == 0)
594                 sta_priv->max_agg_bufsize =
595                         LINK_QUAL_AGG_FRAME_LIMIT_DEF;
596
597         /*
598          * Even though in theory the peer could have different
599          * aggregation reorder buffer sizes for different sessions,
600          * our ucode doesn't allow for that and has a global limit
601          * for each station. Therefore, use the minimum of all the
602          * aggregation sessions and our default value.
603          */
604         sta_priv->max_agg_bufsize =
605                 min(sta_priv->max_agg_bufsize, buf_size);
606
607         if (cfg(priv)->ht_params &&
608             cfg(priv)->ht_params->use_rts_for_aggregation) {
609                 /*
610                  * switch to RTS/CTS if it is the prefer protection
611                  * method for HT traffic
612                  */
613
614                 sta_priv->lq_sta.lq.general_params.flags |=
615                         LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK;
616         }
617         priv->agg_tids_count++;
618         IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
619                      priv->agg_tids_count);
620
621         sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit =
622                 sta_priv->max_agg_bufsize;
623
624         IWL_DEBUG_HT(priv, "Tx aggregation enabled on ra = %pM tid = %d\n",
625                  sta->addr, tid);
626
627         return iwl_send_lq_cmd(priv, ctx,
628                         &sta_priv->lq_sta.lq, CMD_ASYNC, false);
629 }
630
631 static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid)
632 {
633         struct iwl_tid_data *tid_data = &priv->tid_data[sta_id][tid];
634         enum iwl_rxon_context_id ctx;
635         struct ieee80211_vif *vif;
636         u8 *addr;
637
638         lockdep_assert_held(&priv->shrd->sta_lock);
639
640         addr = priv->stations[sta_id].sta.sta.addr;
641         ctx = priv->stations[sta_id].ctxid;
642         vif = priv->contexts[ctx].vif;
643
644         switch (priv->tid_data[sta_id][tid].agg.state) {
645         case IWL_EMPTYING_HW_QUEUE_DELBA:
646                 /* There are no packets for this RA / TID in the HW any more */
647                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
648                         IWL_DEBUG_TX_QUEUES(priv,
649                                 "Can continue DELBA flow ssn = next_recl ="
650                                 " %d", tid_data->next_reclaimed);
651                         iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
652                         tid_data->agg.state = IWL_AGG_OFF;
653                         ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
654                 }
655                 break;
656         case IWL_EMPTYING_HW_QUEUE_ADDBA:
657                 /* There are no packets for this RA / TID in the HW any more */
658                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
659                         IWL_DEBUG_TX_QUEUES(priv,
660                                 "Can continue ADDBA flow ssn = next_recl ="
661                                 " %d", tid_data->next_reclaimed);
662                         tid_data->agg.state = IWL_AGG_ON;
663                         ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
664                 }
665                 break;
666         default:
667                 break;
668         }
669 }
670
671 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
672                                      struct iwl_rxon_context *ctx,
673                                      const u8 *addr1)
674 {
675         struct ieee80211_sta *sta;
676         struct iwl_station_priv *sta_priv;
677
678         rcu_read_lock();
679         sta = ieee80211_find_sta(ctx->vif, addr1);
680         if (sta) {
681                 sta_priv = (void *)sta->drv_priv;
682                 /* avoid atomic ops if this isn't a client */
683                 if (sta_priv->client &&
684                     atomic_dec_return(&sta_priv->pending_frames) == 0)
685                         ieee80211_sta_block_awake(priv->hw, sta, false);
686         }
687         rcu_read_unlock();
688 }
689
690 /**
691  * translate ucode response to mac80211 tx status control values
692  */
693 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
694                                   struct ieee80211_tx_info *info)
695 {
696         struct ieee80211_tx_rate *r = &info->control.rates[0];
697
698         info->antenna_sel_tx =
699                 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
700         if (rate_n_flags & RATE_MCS_HT_MSK)
701                 r->flags |= IEEE80211_TX_RC_MCS;
702         if (rate_n_flags & RATE_MCS_GF_MSK)
703                 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
704         if (rate_n_flags & RATE_MCS_HT40_MSK)
705                 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
706         if (rate_n_flags & RATE_MCS_DUP_MSK)
707                 r->flags |= IEEE80211_TX_RC_DUP_DATA;
708         if (rate_n_flags & RATE_MCS_SGI_MSK)
709                 r->flags |= IEEE80211_TX_RC_SHORT_GI;
710         r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
711 }
712
713 #ifdef CONFIG_IWLWIFI_DEBUG
714 const char *iwl_get_tx_fail_reason(u32 status)
715 {
716 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
717 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
718
719         switch (status & TX_STATUS_MSK) {
720         case TX_STATUS_SUCCESS:
721                 return "SUCCESS";
722         TX_STATUS_POSTPONE(DELAY);
723         TX_STATUS_POSTPONE(FEW_BYTES);
724         TX_STATUS_POSTPONE(BT_PRIO);
725         TX_STATUS_POSTPONE(QUIET_PERIOD);
726         TX_STATUS_POSTPONE(CALC_TTAK);
727         TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
728         TX_STATUS_FAIL(SHORT_LIMIT);
729         TX_STATUS_FAIL(LONG_LIMIT);
730         TX_STATUS_FAIL(FIFO_UNDERRUN);
731         TX_STATUS_FAIL(DRAIN_FLOW);
732         TX_STATUS_FAIL(RFKILL_FLUSH);
733         TX_STATUS_FAIL(LIFE_EXPIRE);
734         TX_STATUS_FAIL(DEST_PS);
735         TX_STATUS_FAIL(HOST_ABORTED);
736         TX_STATUS_FAIL(BT_RETRY);
737         TX_STATUS_FAIL(STA_INVALID);
738         TX_STATUS_FAIL(FRAG_DROPPED);
739         TX_STATUS_FAIL(TID_DISABLE);
740         TX_STATUS_FAIL(FIFO_FLUSHED);
741         TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
742         TX_STATUS_FAIL(PASSIVE_NO_RX);
743         TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
744         }
745
746         return "UNKNOWN";
747
748 #undef TX_STATUS_FAIL
749 #undef TX_STATUS_POSTPONE
750 }
751 #endif /* CONFIG_IWLWIFI_DEBUG */
752
753 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
754 {
755         status &= AGG_TX_STATUS_MSK;
756
757         switch (status) {
758         case AGG_TX_STATE_UNDERRUN_MSK:
759                 priv->reply_agg_tx_stats.underrun++;
760                 break;
761         case AGG_TX_STATE_BT_PRIO_MSK:
762                 priv->reply_agg_tx_stats.bt_prio++;
763                 break;
764         case AGG_TX_STATE_FEW_BYTES_MSK:
765                 priv->reply_agg_tx_stats.few_bytes++;
766                 break;
767         case AGG_TX_STATE_ABORT_MSK:
768                 priv->reply_agg_tx_stats.abort++;
769                 break;
770         case AGG_TX_STATE_LAST_SENT_TTL_MSK:
771                 priv->reply_agg_tx_stats.last_sent_ttl++;
772                 break;
773         case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
774                 priv->reply_agg_tx_stats.last_sent_try++;
775                 break;
776         case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
777                 priv->reply_agg_tx_stats.last_sent_bt_kill++;
778                 break;
779         case AGG_TX_STATE_SCD_QUERY_MSK:
780                 priv->reply_agg_tx_stats.scd_query++;
781                 break;
782         case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
783                 priv->reply_agg_tx_stats.bad_crc32++;
784                 break;
785         case AGG_TX_STATE_RESPONSE_MSK:
786                 priv->reply_agg_tx_stats.response++;
787                 break;
788         case AGG_TX_STATE_DUMP_TX_MSK:
789                 priv->reply_agg_tx_stats.dump_tx++;
790                 break;
791         case AGG_TX_STATE_DELAY_TX_MSK:
792                 priv->reply_agg_tx_stats.delay_tx++;
793                 break;
794         default:
795                 priv->reply_agg_tx_stats.unknown++;
796                 break;
797         }
798 }
799
800 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
801                                 struct iwlagn_tx_resp *tx_resp)
802 {
803         struct agg_tx_status *frame_status = &tx_resp->status;
804         int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
805                 IWLAGN_TX_RES_TID_POS;
806         int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
807                 IWLAGN_TX_RES_RA_POS;
808         struct iwl_ht_agg *agg = &priv->tid_data[sta_id][tid].agg;
809         u32 status = le16_to_cpu(tx_resp->status.status);
810         int i;
811
812         WARN_ON(tid == IWL_TID_NON_QOS);
813
814         if (agg->wait_for_ba)
815                 IWL_DEBUG_TX_REPLY(priv,
816                         "got tx response w/o block-ack\n");
817
818         agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
819         agg->wait_for_ba = (tx_resp->frame_count > 1);
820
821         /*
822          * If the BT kill count is non-zero, we'll get this
823          * notification again.
824          */
825         if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
826             cfg(priv)->bt_params &&
827             cfg(priv)->bt_params->advanced_bt_coexist) {
828                 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
829         }
830
831         if (tx_resp->frame_count == 1)
832                 return;
833
834         /* Construct bit-map of pending frames within Tx window */
835         for (i = 0; i < tx_resp->frame_count; i++) {
836                 u16 fstatus = le16_to_cpu(frame_status[i].status);
837
838                 if (status & AGG_TX_STATUS_MSK)
839                         iwlagn_count_agg_tx_err_status(priv, fstatus);
840
841                 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
842                               AGG_TX_STATE_ABORT_MSK))
843                         continue;
844
845                 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
846                                    "try-count (0x%08x)\n",
847                                    iwl_get_agg_tx_fail_reason(fstatus),
848                                    fstatus & AGG_TX_STATUS_MSK,
849                                    fstatus & AGG_TX_TRY_MSK);
850         }
851 }
852
853 #ifdef CONFIG_IWLWIFI_DEBUG
854 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
855
856 const char *iwl_get_agg_tx_fail_reason(u16 status)
857 {
858         status &= AGG_TX_STATUS_MSK;
859         switch (status) {
860         case AGG_TX_STATE_TRANSMITTED:
861                 return "SUCCESS";
862                 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
863                 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
864                 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
865                 AGG_TX_STATE_FAIL(ABORT_MSK);
866                 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
867                 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
868                 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
869                 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
870                 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
871                 AGG_TX_STATE_FAIL(RESPONSE_MSK);
872                 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
873                 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
874         }
875
876         return "UNKNOWN";
877 }
878 #endif /* CONFIG_IWLWIFI_DEBUG */
879
880 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
881 {
882         return le32_to_cpup((__le32 *)&tx_resp->status +
883                             tx_resp->frame_count) & MAX_SN;
884 }
885
886 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
887 {
888         status &= TX_STATUS_MSK;
889
890         switch (status) {
891         case TX_STATUS_POSTPONE_DELAY:
892                 priv->reply_tx_stats.pp_delay++;
893                 break;
894         case TX_STATUS_POSTPONE_FEW_BYTES:
895                 priv->reply_tx_stats.pp_few_bytes++;
896                 break;
897         case TX_STATUS_POSTPONE_BT_PRIO:
898                 priv->reply_tx_stats.pp_bt_prio++;
899                 break;
900         case TX_STATUS_POSTPONE_QUIET_PERIOD:
901                 priv->reply_tx_stats.pp_quiet_period++;
902                 break;
903         case TX_STATUS_POSTPONE_CALC_TTAK:
904                 priv->reply_tx_stats.pp_calc_ttak++;
905                 break;
906         case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
907                 priv->reply_tx_stats.int_crossed_retry++;
908                 break;
909         case TX_STATUS_FAIL_SHORT_LIMIT:
910                 priv->reply_tx_stats.short_limit++;
911                 break;
912         case TX_STATUS_FAIL_LONG_LIMIT:
913                 priv->reply_tx_stats.long_limit++;
914                 break;
915         case TX_STATUS_FAIL_FIFO_UNDERRUN:
916                 priv->reply_tx_stats.fifo_underrun++;
917                 break;
918         case TX_STATUS_FAIL_DRAIN_FLOW:
919                 priv->reply_tx_stats.drain_flow++;
920                 break;
921         case TX_STATUS_FAIL_RFKILL_FLUSH:
922                 priv->reply_tx_stats.rfkill_flush++;
923                 break;
924         case TX_STATUS_FAIL_LIFE_EXPIRE:
925                 priv->reply_tx_stats.life_expire++;
926                 break;
927         case TX_STATUS_FAIL_DEST_PS:
928                 priv->reply_tx_stats.dest_ps++;
929                 break;
930         case TX_STATUS_FAIL_HOST_ABORTED:
931                 priv->reply_tx_stats.host_abort++;
932                 break;
933         case TX_STATUS_FAIL_BT_RETRY:
934                 priv->reply_tx_stats.bt_retry++;
935                 break;
936         case TX_STATUS_FAIL_STA_INVALID:
937                 priv->reply_tx_stats.sta_invalid++;
938                 break;
939         case TX_STATUS_FAIL_FRAG_DROPPED:
940                 priv->reply_tx_stats.frag_drop++;
941                 break;
942         case TX_STATUS_FAIL_TID_DISABLE:
943                 priv->reply_tx_stats.tid_disable++;
944                 break;
945         case TX_STATUS_FAIL_FIFO_FLUSHED:
946                 priv->reply_tx_stats.fifo_flush++;
947                 break;
948         case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
949                 priv->reply_tx_stats.insuff_cf_poll++;
950                 break;
951         case TX_STATUS_FAIL_PASSIVE_NO_RX:
952                 priv->reply_tx_stats.fail_hw_drop++;
953                 break;
954         case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
955                 priv->reply_tx_stats.sta_color_mismatch++;
956                 break;
957         default:
958                 priv->reply_tx_stats.unknown++;
959                 break;
960         }
961 }
962
963 static void iwlagn_set_tx_status(struct iwl_priv *priv,
964                                  struct ieee80211_tx_info *info,
965                                  struct iwlagn_tx_resp *tx_resp,
966                                  bool is_agg)
967 {
968         u16  status = le16_to_cpu(tx_resp->status.status);
969
970         info->status.rates[0].count = tx_resp->failure_frame + 1;
971         if (is_agg)
972                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
973         info->flags |= iwl_tx_status_to_mac80211(status);
974         iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
975                                     info);
976         if (!iwl_is_tx_success(status))
977                 iwlagn_count_tx_err_status(priv, status);
978 }
979
980 static void iwl_check_abort_status(struct iwl_priv *priv,
981                             u8 frame_count, u32 status)
982 {
983         if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
984                 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
985                 if (!test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
986                         queue_work(priv->shrd->workqueue, &priv->tx_flush);
987         }
988 }
989
990 int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
991                                struct iwl_device_cmd *cmd)
992 {
993         struct iwl_rx_packet *pkt = rxb_addr(rxb);
994         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
995         int txq_id = SEQ_TO_QUEUE(sequence);
996         int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
997         struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
998         struct ieee80211_hdr *hdr;
999         u32 status = le16_to_cpu(tx_resp->status.status);
1000         u16 ssn = iwlagn_get_scd_ssn(tx_resp);
1001         int tid;
1002         int sta_id;
1003         int freed;
1004         struct ieee80211_tx_info *info;
1005         unsigned long flags;
1006         struct sk_buff_head skbs;
1007         struct sk_buff *skb;
1008         struct iwl_rxon_context *ctx;
1009         bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
1010
1011         tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
1012                 IWLAGN_TX_RES_TID_POS;
1013         sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
1014                 IWLAGN_TX_RES_RA_POS;
1015
1016         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1017
1018         if (is_agg)
1019                 iwl_rx_reply_tx_agg(priv, tx_resp);
1020
1021         if (tx_resp->frame_count == 1) {
1022                 u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl);
1023                 next_reclaimed = SEQ_TO_SN(next_reclaimed + 0x10);
1024
1025                 if (is_agg) {
1026                         /* If this is an aggregation queue, we can rely on the
1027                          * ssn since the wifi sequence number corresponds to
1028                          * the index in the TFD ring (%256).
1029                          * The seq_ctl is the sequence control of the packet
1030                          * to which this Tx response relates. But if there is a
1031                          * hole in the bitmap of the BA we received, this Tx
1032                          * response may allow to reclaim the hole and all the
1033                          * subsequent packets that were already acked.
1034                          * In that case, seq_ctl != ssn, and the next packet
1035                          * to be reclaimed will be ssn and not seq_ctl.
1036                          */
1037                         next_reclaimed = ssn;
1038                 }
1039
1040                 __skb_queue_head_init(&skbs);
1041
1042                 if (tid != IWL_TID_NON_QOS) {
1043                         priv->tid_data[sta_id][tid].next_reclaimed =
1044                                 next_reclaimed;
1045                         IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d",
1046                                                   next_reclaimed);
1047                 }
1048
1049                 /*we can free until ssn % q.n_bd not inclusive */
1050                 WARN_ON(iwl_trans_reclaim(trans(priv), sta_id, tid, txq_id,
1051                                   ssn, status, &skbs));
1052                 iwlagn_check_ratid_empty(priv, sta_id, tid);
1053                 freed = 0;
1054                 while (!skb_queue_empty(&skbs)) {
1055                         skb = __skb_dequeue(&skbs);
1056                         hdr = (struct ieee80211_hdr *)skb->data;
1057
1058                         if (!ieee80211_is_data_qos(hdr->frame_control))
1059                                 priv->last_seq_ctl = tx_resp->seq_ctl;
1060
1061                         info = IEEE80211_SKB_CB(skb);
1062                         ctx = info->driver_data[0];
1063                         kmem_cache_free(priv->tx_cmd_pool,
1064                                         (info->driver_data[1]));
1065
1066                         memset(&info->status, 0, sizeof(info->status));
1067
1068                         if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
1069                             iwl_is_associated_ctx(ctx) && ctx->vif &&
1070                             ctx->vif->type == NL80211_IFTYPE_STATION) {
1071                                 ctx->last_tx_rejected = true;
1072                                 iwl_trans_stop_queue(trans(priv), txq_id,
1073                                         "Tx on passive channel");
1074
1075                                 IWL_DEBUG_TX_REPLY(priv,
1076                                            "TXQ %d status %s (0x%08x) "
1077                                            "rate_n_flags 0x%x retries %d\n",
1078                                            txq_id,
1079                                            iwl_get_tx_fail_reason(status),
1080                                            status,
1081                                            le32_to_cpu(tx_resp->rate_n_flags),
1082                                            tx_resp->failure_frame);
1083
1084                                 IWL_DEBUG_TX_REPLY(priv,
1085                                            "FrameCnt = %d, idx=%d\n",
1086                                            tx_resp->frame_count, cmd_index);
1087                         }
1088
1089                         /* check if BAR is needed */
1090                         if (is_agg && !iwl_is_tx_success(status))
1091                                 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1092                         iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
1093                                      tx_resp, is_agg);
1094                         if (!is_agg)
1095                                 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
1096
1097                         ieee80211_tx_status_irqsafe(priv->hw, skb);
1098
1099                         freed++;
1100                 }
1101
1102                 WARN_ON(!is_agg && freed != 1);
1103         }
1104
1105         iwl_check_abort_status(priv, tx_resp->frame_count, status);
1106         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1107         return 0;
1108 }
1109
1110 /**
1111  * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1112  *
1113  * Handles block-acknowledge notification from device, which reports success
1114  * of frames sent via aggregation.
1115  */
1116 int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1117                                    struct iwl_rx_mem_buffer *rxb,
1118                                    struct iwl_device_cmd *cmd)
1119 {
1120         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1121         struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1122         struct iwl_ht_agg *agg;
1123         struct sk_buff_head reclaimed_skbs;
1124         struct ieee80211_tx_info *info;
1125         struct ieee80211_hdr *hdr;
1126         struct sk_buff *skb;
1127         unsigned long flags;
1128         int sta_id;
1129         int tid;
1130         int freed;
1131
1132         /* "flow" corresponds to Tx queue */
1133         u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1134
1135         /* "ssn" is start of block-ack Tx window, corresponds to index
1136          * (in Tx queue's circular buffer) of first TFD/frame in window */
1137         u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1138
1139         if (scd_flow >= hw_params(priv).max_txq_num) {
1140                 IWL_ERR(priv,
1141                         "BUG_ON scd_flow is bigger than number of queues\n");
1142                 return 0;
1143         }
1144
1145         sta_id = ba_resp->sta_id;
1146         tid = ba_resp->tid;
1147         agg = &priv->tid_data[sta_id][tid].agg;
1148
1149         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1150
1151         if (unlikely(!agg->wait_for_ba)) {
1152                 if (unlikely(ba_resp->bitmap))
1153                         IWL_ERR(priv, "Received BA when not expected\n");
1154                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1155                 return 0;
1156         }
1157
1158         __skb_queue_head_init(&reclaimed_skbs);
1159
1160         /* Release all TFDs before the SSN, i.e. all TFDs in front of
1161          * block-ack window (we assume that they've been successfully
1162          * transmitted ... if not, it's too late anyway). */
1163         if (iwl_trans_reclaim(trans(priv), sta_id, tid, scd_flow,
1164                               ba_resp_scd_ssn, 0, &reclaimed_skbs)) {
1165                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1166                 return 0;
1167         }
1168
1169         IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1170                            "sta_id = %d\n",
1171                            agg->wait_for_ba,
1172                            (u8 *) &ba_resp->sta_addr_lo32,
1173                            ba_resp->sta_id);
1174         IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
1175                            "scd_flow = %d, scd_ssn = %d\n",
1176                            ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl),
1177                            (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1178                            scd_flow, ba_resp_scd_ssn);
1179
1180         /* Mark that the expected block-ack response arrived */
1181         agg->wait_for_ba = false;
1182
1183         /* Sanity check values reported by uCode */
1184         if (ba_resp->txed_2_done > ba_resp->txed) {
1185                 IWL_DEBUG_TX_REPLY(priv,
1186                         "bogus sent(%d) and ack(%d) count\n",
1187                         ba_resp->txed, ba_resp->txed_2_done);
1188                 /*
1189                  * set txed_2_done = txed,
1190                  * so it won't impact rate scale
1191                  */
1192                 ba_resp->txed = ba_resp->txed_2_done;
1193         }
1194         IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
1195                         ba_resp->txed, ba_resp->txed_2_done);
1196
1197         priv->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn;
1198
1199         iwlagn_check_ratid_empty(priv, sta_id, tid);
1200         freed = 0;
1201         while (!skb_queue_empty(&reclaimed_skbs)) {
1202
1203                 skb = __skb_dequeue(&reclaimed_skbs);
1204                 hdr = (struct ieee80211_hdr *)skb->data;
1205
1206                 if (ieee80211_is_data_qos(hdr->frame_control))
1207                         freed++;
1208                 else
1209                         WARN_ON_ONCE(1);
1210
1211                 info = IEEE80211_SKB_CB(skb);
1212                 kmem_cache_free(priv->tx_cmd_pool, (info->driver_data[1]));
1213
1214                 if (freed == 1) {
1215                         /* this is the first skb we deliver in this batch */
1216                         /* put the rate scaling data there */
1217                         info = IEEE80211_SKB_CB(skb);
1218                         memset(&info->status, 0, sizeof(info->status));
1219                         info->flags |= IEEE80211_TX_STAT_ACK;
1220                         info->flags |= IEEE80211_TX_STAT_AMPDU;
1221                         info->status.ampdu_ack_len = ba_resp->txed_2_done;
1222                         info->status.ampdu_len = ba_resp->txed;
1223                         iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1224                                                     info);
1225                 }
1226
1227                 ieee80211_tx_status_irqsafe(priv->hw, skb);
1228         }
1229
1230         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1231         return 0;
1232 }