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iwlwifi: audit single frames from AGG queue in RS
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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 #include "iwl-io.h"
36 #include "iwl-trans.h"
37 #include "iwl-agn-hw.h"
38 #include "dev.h"
39 #include "agn.h"
40
41 static const u8 tid_to_ac[] = {
42         IEEE80211_AC_BE,
43         IEEE80211_AC_BK,
44         IEEE80211_AC_BK,
45         IEEE80211_AC_BE,
46         IEEE80211_AC_VI,
47         IEEE80211_AC_VI,
48         IEEE80211_AC_VO,
49         IEEE80211_AC_VO,
50 };
51
52 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
53                                      struct ieee80211_tx_info *info,
54                                      __le16 fc, __le32 *tx_flags)
55 {
56         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
57             info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
58             info->flags & IEEE80211_TX_CTL_AMPDU)
59                 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
60 }
61
62 /*
63  * handle build REPLY_TX command notification.
64  */
65 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
66                                       struct sk_buff *skb,
67                                       struct iwl_tx_cmd *tx_cmd,
68                                       struct ieee80211_tx_info *info,
69                                       struct ieee80211_hdr *hdr, u8 sta_id)
70 {
71         __le16 fc = hdr->frame_control;
72         __le32 tx_flags = tx_cmd->tx_flags;
73
74         tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
75
76         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
77                 tx_flags |= TX_CMD_FLG_ACK_MSK;
78         else
79                 tx_flags &= ~TX_CMD_FLG_ACK_MSK;
80
81         if (ieee80211_is_probe_resp(fc))
82                 tx_flags |= TX_CMD_FLG_TSF_MSK;
83         else if (ieee80211_is_back_req(fc))
84                 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
85         else if (info->band == IEEE80211_BAND_2GHZ &&
86                  priv->cfg->bt_params &&
87                  priv->cfg->bt_params->advanced_bt_coexist &&
88                  (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
89                  ieee80211_is_reassoc_req(fc) ||
90                  skb->protocol == cpu_to_be16(ETH_P_PAE)))
91                 tx_flags |= TX_CMD_FLG_IGNORE_BT;
92
93
94         tx_cmd->sta_id = sta_id;
95         if (ieee80211_has_morefrags(fc))
96                 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
97
98         if (ieee80211_is_data_qos(fc)) {
99                 u8 *qc = ieee80211_get_qos_ctl(hdr);
100                 tx_cmd->tid_tspec = qc[0] & 0xf;
101                 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
102         } else {
103                 tx_cmd->tid_tspec = IWL_TID_NON_QOS;
104                 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
105                         tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
106                 else
107                         tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
108         }
109
110         iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
111
112         tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
113         if (ieee80211_is_mgmt(fc)) {
114                 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
115                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
116                 else
117                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
118         } else {
119                 tx_cmd->timeout.pm_frame_timeout = 0;
120         }
121
122         tx_cmd->driver_txop = 0;
123         tx_cmd->tx_flags = tx_flags;
124         tx_cmd->next_frame_len = 0;
125 }
126
127 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
128                                      struct iwl_tx_cmd *tx_cmd,
129                                      struct ieee80211_tx_info *info,
130                                      struct ieee80211_sta *sta,
131                                      __le16 fc)
132 {
133         u32 rate_flags;
134         int rate_idx;
135         u8 rts_retry_limit;
136         u8 data_retry_limit;
137         u8 rate_plcp;
138
139         if (priv->wowlan) {
140                 rts_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
141                 data_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
142         } else {
143                 /* Set retry limit on RTS packets */
144                 rts_retry_limit = IWLAGN_RTS_DFAULT_RETRY_LIMIT;
145
146                 /* Set retry limit on DATA packets and Probe Responses*/
147                 if (ieee80211_is_probe_resp(fc)) {
148                         data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT;
149                         rts_retry_limit =
150                                 min(data_retry_limit, rts_retry_limit);
151                 } else if (ieee80211_is_back_req(fc))
152                         data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT;
153                 else
154                         data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
155         }
156
157         tx_cmd->data_retry_limit = data_retry_limit;
158         tx_cmd->rts_retry_limit = rts_retry_limit;
159
160         /* DATA packets will use the uCode station table for rate/antenna
161          * selection */
162         if (ieee80211_is_data(fc)) {
163                 tx_cmd->initial_rate_index = 0;
164                 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
165 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
166                 if (priv->tm_fixed_rate) {
167                         /*
168                          * rate overwrite by testmode
169                          * we not only send lq command to change rate
170                          * we also re-enforce per data pkt base.
171                          */
172                         tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
173                         memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
174                                sizeof(tx_cmd->rate_n_flags));
175                 }
176 #endif
177                 return;
178         } else if (ieee80211_is_back_req(fc))
179                 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
180
181         /**
182          * If the current TX rate stored in mac80211 has the MCS bit set, it's
183          * not really a TX rate.  Thus, we use the lowest supported rate for
184          * this band.  Also use the lowest supported rate if the stored rate
185          * index is invalid.
186          */
187         rate_idx = info->control.rates[0].idx;
188         if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
189                         (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
190                 rate_idx = rate_lowest_index(
191                                 &priv->nvm_data->bands[info->band], sta);
192         /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
193         if (info->band == IEEE80211_BAND_5GHZ)
194                 rate_idx += IWL_FIRST_OFDM_RATE;
195         /* Get PLCP rate for tx_cmd->rate_n_flags */
196         rate_plcp = iwl_rates[rate_idx].plcp;
197         /* Zero out flags for this packet */
198         rate_flags = 0;
199
200         /* Set CCK flag as needed */
201         if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
202                 rate_flags |= RATE_MCS_CCK_MSK;
203
204         /* Set up antennas */
205          if (priv->cfg->bt_params &&
206              priv->cfg->bt_params->advanced_bt_coexist &&
207              priv->bt_full_concurrent) {
208                 /* operated as 1x1 in full concurrency mode */
209                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
210                                 first_antenna(priv->nvm_data->valid_tx_ant));
211         } else
212                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(
213                                         priv, priv->mgmt_tx_ant,
214                                         priv->nvm_data->valid_tx_ant);
215         rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
216
217         /* Set the rate in the TX cmd */
218         tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
219 }
220
221 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
222                                          struct ieee80211_tx_info *info,
223                                          struct iwl_tx_cmd *tx_cmd,
224                                          struct sk_buff *skb_frag)
225 {
226         struct ieee80211_key_conf *keyconf = info->control.hw_key;
227
228         switch (keyconf->cipher) {
229         case WLAN_CIPHER_SUITE_CCMP:
230                 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
231                 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
232                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
233                         tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
234                 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
235                 break;
236
237         case WLAN_CIPHER_SUITE_TKIP:
238                 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
239                 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
240                 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
241                 break;
242
243         case WLAN_CIPHER_SUITE_WEP104:
244                 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
245                 /* fall through */
246         case WLAN_CIPHER_SUITE_WEP40:
247                 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
248                         (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
249
250                 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
251
252                 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
253                              "with key %d\n", keyconf->keyidx);
254                 break;
255
256         default:
257                 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
258                 break;
259         }
260 }
261
262 /**
263  * iwl_sta_id_or_broadcast - return sta_id or broadcast sta
264  * @context: the current context
265  * @sta: mac80211 station
266  *
267  * In certain circumstances mac80211 passes a station pointer
268  * that may be %NULL, for example during TX or key setup. In
269  * that case, we need to use the broadcast station, so this
270  * inline wraps that pattern.
271  */
272 static int iwl_sta_id_or_broadcast(struct iwl_rxon_context *context,
273                                    struct ieee80211_sta *sta)
274 {
275         int sta_id;
276
277         if (!sta)
278                 return context->bcast_sta_id;
279
280         sta_id = iwl_sta_id(sta);
281
282         /*
283          * mac80211 should not be passing a partially
284          * initialised station!
285          */
286         WARN_ON(sta_id == IWL_INVALID_STATION);
287
288         return sta_id;
289 }
290
291 /*
292  * start REPLY_TX command process
293  */
294 int iwlagn_tx_skb(struct iwl_priv *priv,
295                   struct ieee80211_sta *sta,
296                   struct sk_buff *skb)
297 {
298         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
299         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
300         struct iwl_station_priv *sta_priv = NULL;
301         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
302         struct iwl_device_cmd *dev_cmd;
303         struct iwl_tx_cmd *tx_cmd;
304         __le16 fc;
305         u8 hdr_len;
306         u16 len, seq_number = 0;
307         u8 sta_id, tid = IWL_MAX_TID_COUNT;
308         bool is_agg = false, is_data_qos = false;
309         int txq_id;
310
311         if (info->control.vif)
312                 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
313
314         if (iwl_is_rfkill(priv)) {
315                 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
316                 goto drop_unlock_priv;
317         }
318
319         fc = hdr->frame_control;
320
321 #ifdef CONFIG_IWLWIFI_DEBUG
322         if (ieee80211_is_auth(fc))
323                 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
324         else if (ieee80211_is_assoc_req(fc))
325                 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
326         else if (ieee80211_is_reassoc_req(fc))
327                 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
328 #endif
329
330         if (unlikely(ieee80211_is_probe_resp(fc))) {
331                 struct iwl_wipan_noa_data *noa_data =
332                         rcu_dereference(priv->noa_data);
333
334                 if (noa_data &&
335                     pskb_expand_head(skb, 0, noa_data->length,
336                                      GFP_ATOMIC) == 0) {
337                         memcpy(skb_put(skb, noa_data->length),
338                                noa_data->data, noa_data->length);
339                         hdr = (struct ieee80211_hdr *)skb->data;
340                 }
341         }
342
343         hdr_len = ieee80211_hdrlen(fc);
344
345         /* For management frames use broadcast id to do not break aggregation */
346         if (!ieee80211_is_data(fc))
347                 sta_id = ctx->bcast_sta_id;
348         else {
349                 /* Find index into station table for destination station */
350                 sta_id = iwl_sta_id_or_broadcast(ctx, sta);
351                 if (sta_id == IWL_INVALID_STATION) {
352                         IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
353                                        hdr->addr1);
354                         goto drop_unlock_priv;
355                 }
356         }
357
358         IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
359
360         if (sta)
361                 sta_priv = (void *)sta->drv_priv;
362
363         if (sta_priv && sta_priv->asleep &&
364             (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)) {
365                 /*
366                  * This sends an asynchronous command to the device,
367                  * but we can rely on it being processed before the
368                  * next frame is processed -- and the next frame to
369                  * this station is the one that will consume this
370                  * counter.
371                  * For now set the counter to just 1 since we do not
372                  * support uAPSD yet.
373                  *
374                  * FIXME: If we get two non-bufferable frames one
375                  * after the other, we might only send out one of
376                  * them because this is racy.
377                  */
378                 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
379         }
380
381         dev_cmd = iwl_trans_alloc_tx_cmd(priv->trans);
382
383         if (unlikely(!dev_cmd))
384                 goto drop_unlock_priv;
385
386         memset(dev_cmd, 0, sizeof(*dev_cmd));
387         tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
388
389         /* Total # bytes to be transmitted */
390         len = (u16)skb->len;
391         tx_cmd->len = cpu_to_le16(len);
392
393         if (info->control.hw_key)
394                 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb);
395
396         /* TODO need this for burst mode later on */
397         iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
398
399         iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, sta, fc);
400
401         memset(&info->status, 0, sizeof(info->status));
402
403         info->driver_data[0] = ctx;
404         info->driver_data[1] = dev_cmd;
405         /* From now on, we cannot access info->control */
406
407         spin_lock(&priv->sta_lock);
408
409         if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
410                 u8 *qc = NULL;
411                 struct iwl_tid_data *tid_data;
412                 qc = ieee80211_get_qos_ctl(hdr);
413                 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
414                 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
415                         goto drop_unlock_sta;
416                 tid_data = &priv->tid_data[sta_id][tid];
417
418                 /* aggregation is on for this <sta,tid> */
419                 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
420                     tid_data->agg.state != IWL_AGG_ON) {
421                         IWL_ERR(priv, "TX_CTL_AMPDU while not in AGG:"
422                                 " Tx flags = 0x%08x, agg.state = %d",
423                                 info->flags, tid_data->agg.state);
424                         IWL_ERR(priv, "sta_id = %d, tid = %d seq_num = %d",
425                                 sta_id, tid, SEQ_TO_SN(tid_data->seq_number));
426                         goto drop_unlock_sta;
427                 }
428
429                 /* We can receive packets from the stack in IWL_AGG_{ON,OFF}
430                  * only. Check this here.
431                  */
432                 if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON &&
433                               tid_data->agg.state != IWL_AGG_OFF,
434                     "Tx while agg.state = %d", tid_data->agg.state))
435                         goto drop_unlock_sta;
436
437                 seq_number = tid_data->seq_number;
438                 seq_number &= IEEE80211_SCTL_SEQ;
439                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
440                 hdr->seq_ctrl |= cpu_to_le16(seq_number);
441                 seq_number += 0x10;
442
443                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
444                         is_agg = true;
445                 is_data_qos = true;
446         }
447
448         /* Copy MAC header from skb into command buffer */
449         memcpy(tx_cmd->hdr, hdr, hdr_len);
450
451         if (is_agg)
452                 txq_id = priv->tid_data[sta_id][tid].agg.txq_id;
453         else if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
454                 /*
455                  * Send this frame after DTIM -- there's a special queue
456                  * reserved for this for contexts that support AP mode.
457                  */
458                 txq_id = ctx->mcast_queue;
459
460                 /*
461                  * The microcode will clear the more data
462                  * bit in the last frame it transmits.
463                  */
464                 hdr->frame_control |=
465                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
466         } else if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
467                 txq_id = IWL_AUX_QUEUE;
468         else
469                 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
470
471         WARN_ON_ONCE(!is_agg && txq_id != info->hw_queue);
472         WARN_ON_ONCE(is_agg &&
473                      priv->queue_to_mac80211[txq_id] != info->hw_queue);
474
475         if (iwl_trans_tx(priv->trans, skb, dev_cmd, txq_id))
476                 goto drop_unlock_sta;
477
478         if (is_data_qos && !ieee80211_has_morefrags(fc))
479                 priv->tid_data[sta_id][tid].seq_number = seq_number;
480
481         spin_unlock(&priv->sta_lock);
482
483         /*
484          * Avoid atomic ops if it isn't an associated client.
485          * Also, if this is a packet for aggregation, don't
486          * increase the counter because the ucode will stop
487          * aggregation queues when their respective station
488          * goes to sleep.
489          */
490         if (sta_priv && sta_priv->client && !is_agg)
491                 atomic_inc(&sta_priv->pending_frames);
492
493         if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
494                 iwl_scan_offchannel_skb(priv);
495
496         return 0;
497
498 drop_unlock_sta:
499         if (dev_cmd)
500                 iwl_trans_free_tx_cmd(priv->trans, dev_cmd);
501         spin_unlock(&priv->sta_lock);
502 drop_unlock_priv:
503         return -1;
504 }
505
506 static int iwlagn_alloc_agg_txq(struct iwl_priv *priv, int mq)
507 {
508         int q;
509
510         for (q = IWLAGN_FIRST_AMPDU_QUEUE;
511              q < priv->cfg->base_params->num_of_queues; q++) {
512                 if (!test_and_set_bit(q, priv->agg_q_alloc)) {
513                         priv->queue_to_mac80211[q] = mq;
514                         return q;
515                 }
516         }
517
518         return -ENOSPC;
519 }
520
521 static void iwlagn_dealloc_agg_txq(struct iwl_priv *priv, int q)
522 {
523         clear_bit(q, priv->agg_q_alloc);
524         priv->queue_to_mac80211[q] = IWL_INVALID_MAC80211_QUEUE;
525 }
526
527 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
528                         struct ieee80211_sta *sta, u16 tid)
529 {
530         struct iwl_tid_data *tid_data;
531         int sta_id, txq_id;
532         enum iwl_agg_state agg_state;
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_bh(&priv->sta_lock);
542
543         tid_data = &priv->tid_data[sta_id][tid];
544         txq_id = priv->tid_data[sta_id][tid].agg.txq_id;
545
546         switch (priv->tid_data[sta_id][tid].agg.state) {
547         case IWL_EMPTYING_HW_QUEUE_ADDBA:
548                 /*
549                 * This can happen if the peer stops aggregation
550                 * again before we've had a chance to drain the
551                 * queue we selected previously, i.e. before the
552                 * session was really started completely.
553                 */
554                 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
555                 goto turn_off;
556         case IWL_AGG_STARTING:
557                 /*
558                  * This can happen when the session is stopped before
559                  * we receive ADDBA response
560                  */
561                 IWL_DEBUG_HT(priv, "AGG stop before AGG became operational\n");
562                 goto turn_off;
563         case IWL_AGG_ON:
564                 break;
565         default:
566                 IWL_WARN(priv, "Stopping AGG while state not ON "
567                          "or starting for %d on %d (%d)\n", sta_id, tid,
568                          priv->tid_data[sta_id][tid].agg.state);
569                 spin_unlock_bh(&priv->sta_lock);
570                 return 0;
571         }
572
573         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
574
575         /* There are still packets for this RA / TID in the HW */
576         if (!test_bit(txq_id, priv->agg_q_alloc)) {
577                 IWL_DEBUG_TX_QUEUES(priv,
578                         "stopping AGG on STA/TID %d/%d but hwq %d not used\n",
579                         sta_id, tid, txq_id);
580         } else if (tid_data->agg.ssn != tid_data->next_reclaimed) {
581                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
582                                     "next_recl = %d\n",
583                                     tid_data->agg.ssn,
584                                     tid_data->next_reclaimed);
585                 priv->tid_data[sta_id][tid].agg.state =
586                         IWL_EMPTYING_HW_QUEUE_DELBA;
587                 spin_unlock_bh(&priv->sta_lock);
588                 return 0;
589         }
590
591         IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n",
592                             tid_data->agg.ssn);
593 turn_off:
594         agg_state = priv->tid_data[sta_id][tid].agg.state;
595         priv->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF;
596
597         spin_unlock_bh(&priv->sta_lock);
598
599         if (test_bit(txq_id, priv->agg_q_alloc)) {
600                 /*
601                  * If the transport didn't know that we wanted to start
602                  * agreggation, don't tell it that we want to stop them.
603                  * This can happen when we don't get the addBA response on
604                  * time, or we hadn't time to drain the AC queues.
605                  */
606                 if (agg_state == IWL_AGG_ON)
607                         iwl_trans_txq_disable(priv->trans, txq_id);
608                 else
609                         IWL_DEBUG_TX_QUEUES(priv, "Don't disable tx agg: %d\n",
610                                             agg_state);
611                 iwlagn_dealloc_agg_txq(priv, txq_id);
612         }
613
614         ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
615
616         return 0;
617 }
618
619 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
620                         struct ieee80211_sta *sta, u16 tid, u16 *ssn)
621 {
622         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
623         struct iwl_tid_data *tid_data;
624         int sta_id, txq_id, ret;
625
626         IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
627                      sta->addr, tid);
628
629         sta_id = iwl_sta_id(sta);
630         if (sta_id == IWL_INVALID_STATION) {
631                 IWL_ERR(priv, "Start AGG on invalid station\n");
632                 return -ENXIO;
633         }
634         if (unlikely(tid >= IWL_MAX_TID_COUNT))
635                 return -EINVAL;
636
637         if (priv->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
638                 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
639                 return -ENXIO;
640         }
641
642         txq_id = iwlagn_alloc_agg_txq(priv, ctx->ac_to_queue[tid_to_ac[tid]]);
643         if (txq_id < 0) {
644                 IWL_DEBUG_TX_QUEUES(priv,
645                         "No free aggregation queue for %pM/%d\n",
646                         sta->addr, tid);
647                 return txq_id;
648         }
649
650         ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
651         if (ret)
652                 return ret;
653
654         spin_lock_bh(&priv->sta_lock);
655         tid_data = &priv->tid_data[sta_id][tid];
656         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
657         tid_data->agg.txq_id = txq_id;
658
659         *ssn = tid_data->agg.ssn;
660
661         if (*ssn == tid_data->next_reclaimed) {
662                 IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n",
663                                     tid_data->agg.ssn);
664                 tid_data->agg.state = IWL_AGG_STARTING;
665                 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
666         } else {
667                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
668                                     "next_reclaimed = %d\n",
669                                     tid_data->agg.ssn,
670                                     tid_data->next_reclaimed);
671                 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
672         }
673         spin_unlock_bh(&priv->sta_lock);
674
675         return ret;
676 }
677
678 int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif,
679                         struct ieee80211_sta *sta, u16 tid, u8 buf_size)
680 {
681         struct iwl_station_priv *sta_priv = (void *) sta->drv_priv;
682         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
683         int q, fifo;
684         u16 ssn;
685
686         buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
687
688         spin_lock_bh(&priv->sta_lock);
689         ssn = priv->tid_data[sta_priv->sta_id][tid].agg.ssn;
690         q = priv->tid_data[sta_priv->sta_id][tid].agg.txq_id;
691         priv->tid_data[sta_priv->sta_id][tid].agg.state = IWL_AGG_ON;
692         spin_unlock_bh(&priv->sta_lock);
693
694         fifo = ctx->ac_to_fifo[tid_to_ac[tid]];
695
696         iwl_trans_txq_enable(priv->trans, q, fifo, sta_priv->sta_id, tid,
697                              buf_size, ssn);
698
699         /*
700          * If the limit is 0, then it wasn't initialised yet,
701          * use the default. We can do that since we take the
702          * minimum below, and we don't want to go above our
703          * default due to hardware restrictions.
704          */
705         if (sta_priv->max_agg_bufsize == 0)
706                 sta_priv->max_agg_bufsize =
707                         LINK_QUAL_AGG_FRAME_LIMIT_DEF;
708
709         /*
710          * Even though in theory the peer could have different
711          * aggregation reorder buffer sizes for different sessions,
712          * our ucode doesn't allow for that and has a global limit
713          * for each station. Therefore, use the minimum of all the
714          * aggregation sessions and our default value.
715          */
716         sta_priv->max_agg_bufsize =
717                 min(sta_priv->max_agg_bufsize, buf_size);
718
719         if (priv->hw_params.use_rts_for_aggregation) {
720                 /*
721                  * switch to RTS/CTS if it is the prefer protection
722                  * method for HT traffic
723                  */
724
725                 sta_priv->lq_sta.lq.general_params.flags |=
726                         LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK;
727         }
728         priv->agg_tids_count++;
729         IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
730                      priv->agg_tids_count);
731
732         sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit =
733                 sta_priv->max_agg_bufsize;
734
735         IWL_DEBUG_HT(priv, "Tx aggregation enabled on ra = %pM tid = %d\n",
736                  sta->addr, tid);
737
738         return iwl_send_lq_cmd(priv, ctx,
739                         &sta_priv->lq_sta.lq, CMD_ASYNC, false);
740 }
741
742 static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid)
743 {
744         struct iwl_tid_data *tid_data = &priv->tid_data[sta_id][tid];
745         enum iwl_rxon_context_id ctx;
746         struct ieee80211_vif *vif;
747         u8 *addr;
748
749         lockdep_assert_held(&priv->sta_lock);
750
751         addr = priv->stations[sta_id].sta.sta.addr;
752         ctx = priv->stations[sta_id].ctxid;
753         vif = priv->contexts[ctx].vif;
754
755         switch (priv->tid_data[sta_id][tid].agg.state) {
756         case IWL_EMPTYING_HW_QUEUE_DELBA:
757                 /* There are no packets for this RA / TID in the HW any more */
758                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
759                         IWL_DEBUG_TX_QUEUES(priv,
760                                 "Can continue DELBA flow ssn = next_recl ="
761                                 " %d", tid_data->next_reclaimed);
762                         iwl_trans_txq_disable(priv->trans,
763                                               tid_data->agg.txq_id);
764                         iwlagn_dealloc_agg_txq(priv, tid_data->agg.txq_id);
765                         tid_data->agg.state = IWL_AGG_OFF;
766                         ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
767                 }
768                 break;
769         case IWL_EMPTYING_HW_QUEUE_ADDBA:
770                 /* There are no packets for this RA / TID in the HW any more */
771                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
772                         IWL_DEBUG_TX_QUEUES(priv,
773                                 "Can continue ADDBA flow ssn = next_recl ="
774                                 " %d", tid_data->next_reclaimed);
775                         tid_data->agg.state = IWL_AGG_STARTING;
776                         ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
777                 }
778                 break;
779         default:
780                 break;
781         }
782 }
783
784 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
785                                      struct iwl_rxon_context *ctx,
786                                      const u8 *addr1)
787 {
788         struct ieee80211_sta *sta;
789         struct iwl_station_priv *sta_priv;
790
791         rcu_read_lock();
792         sta = ieee80211_find_sta(ctx->vif, addr1);
793         if (sta) {
794                 sta_priv = (void *)sta->drv_priv;
795                 /* avoid atomic ops if this isn't a client */
796                 if (sta_priv->client &&
797                     atomic_dec_return(&sta_priv->pending_frames) == 0)
798                         ieee80211_sta_block_awake(priv->hw, sta, false);
799         }
800         rcu_read_unlock();
801 }
802
803 /**
804  * translate ucode response to mac80211 tx status control values
805  */
806 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
807                                   struct ieee80211_tx_info *info)
808 {
809         struct ieee80211_tx_rate *r = &info->status.rates[0];
810
811         info->status.antenna =
812                 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
813         if (rate_n_flags & RATE_MCS_HT_MSK)
814                 r->flags |= IEEE80211_TX_RC_MCS;
815         if (rate_n_flags & RATE_MCS_GF_MSK)
816                 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
817         if (rate_n_flags & RATE_MCS_HT40_MSK)
818                 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
819         if (rate_n_flags & RATE_MCS_DUP_MSK)
820                 r->flags |= IEEE80211_TX_RC_DUP_DATA;
821         if (rate_n_flags & RATE_MCS_SGI_MSK)
822                 r->flags |= IEEE80211_TX_RC_SHORT_GI;
823         r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
824 }
825
826 #ifdef CONFIG_IWLWIFI_DEBUG
827 const char *iwl_get_tx_fail_reason(u32 status)
828 {
829 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
830 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
831
832         switch (status & TX_STATUS_MSK) {
833         case TX_STATUS_SUCCESS:
834                 return "SUCCESS";
835         TX_STATUS_POSTPONE(DELAY);
836         TX_STATUS_POSTPONE(FEW_BYTES);
837         TX_STATUS_POSTPONE(BT_PRIO);
838         TX_STATUS_POSTPONE(QUIET_PERIOD);
839         TX_STATUS_POSTPONE(CALC_TTAK);
840         TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
841         TX_STATUS_FAIL(SHORT_LIMIT);
842         TX_STATUS_FAIL(LONG_LIMIT);
843         TX_STATUS_FAIL(FIFO_UNDERRUN);
844         TX_STATUS_FAIL(DRAIN_FLOW);
845         TX_STATUS_FAIL(RFKILL_FLUSH);
846         TX_STATUS_FAIL(LIFE_EXPIRE);
847         TX_STATUS_FAIL(DEST_PS);
848         TX_STATUS_FAIL(HOST_ABORTED);
849         TX_STATUS_FAIL(BT_RETRY);
850         TX_STATUS_FAIL(STA_INVALID);
851         TX_STATUS_FAIL(FRAG_DROPPED);
852         TX_STATUS_FAIL(TID_DISABLE);
853         TX_STATUS_FAIL(FIFO_FLUSHED);
854         TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
855         TX_STATUS_FAIL(PASSIVE_NO_RX);
856         TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
857         }
858
859         return "UNKNOWN";
860
861 #undef TX_STATUS_FAIL
862 #undef TX_STATUS_POSTPONE
863 }
864 #endif /* CONFIG_IWLWIFI_DEBUG */
865
866 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
867 {
868         status &= AGG_TX_STATUS_MSK;
869
870         switch (status) {
871         case AGG_TX_STATE_UNDERRUN_MSK:
872                 priv->reply_agg_tx_stats.underrun++;
873                 break;
874         case AGG_TX_STATE_BT_PRIO_MSK:
875                 priv->reply_agg_tx_stats.bt_prio++;
876                 break;
877         case AGG_TX_STATE_FEW_BYTES_MSK:
878                 priv->reply_agg_tx_stats.few_bytes++;
879                 break;
880         case AGG_TX_STATE_ABORT_MSK:
881                 priv->reply_agg_tx_stats.abort++;
882                 break;
883         case AGG_TX_STATE_LAST_SENT_TTL_MSK:
884                 priv->reply_agg_tx_stats.last_sent_ttl++;
885                 break;
886         case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
887                 priv->reply_agg_tx_stats.last_sent_try++;
888                 break;
889         case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
890                 priv->reply_agg_tx_stats.last_sent_bt_kill++;
891                 break;
892         case AGG_TX_STATE_SCD_QUERY_MSK:
893                 priv->reply_agg_tx_stats.scd_query++;
894                 break;
895         case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
896                 priv->reply_agg_tx_stats.bad_crc32++;
897                 break;
898         case AGG_TX_STATE_RESPONSE_MSK:
899                 priv->reply_agg_tx_stats.response++;
900                 break;
901         case AGG_TX_STATE_DUMP_TX_MSK:
902                 priv->reply_agg_tx_stats.dump_tx++;
903                 break;
904         case AGG_TX_STATE_DELAY_TX_MSK:
905                 priv->reply_agg_tx_stats.delay_tx++;
906                 break;
907         default:
908                 priv->reply_agg_tx_stats.unknown++;
909                 break;
910         }
911 }
912
913 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
914                                 struct iwlagn_tx_resp *tx_resp)
915 {
916         struct agg_tx_status *frame_status = &tx_resp->status;
917         int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
918                 IWLAGN_TX_RES_TID_POS;
919         int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
920                 IWLAGN_TX_RES_RA_POS;
921         struct iwl_ht_agg *agg = &priv->tid_data[sta_id][tid].agg;
922         u32 status = le16_to_cpu(tx_resp->status.status);
923         int i;
924
925         WARN_ON(tid == IWL_TID_NON_QOS);
926
927         if (agg->wait_for_ba)
928                 IWL_DEBUG_TX_REPLY(priv,
929                         "got tx response w/o block-ack\n");
930
931         agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
932         agg->wait_for_ba = (tx_resp->frame_count > 1);
933
934         /*
935          * If the BT kill count is non-zero, we'll get this
936          * notification again.
937          */
938         if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
939             priv->cfg->bt_params &&
940             priv->cfg->bt_params->advanced_bt_coexist) {
941                 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
942         }
943
944         if (tx_resp->frame_count == 1)
945                 return;
946
947         /* Construct bit-map of pending frames within Tx window */
948         for (i = 0; i < tx_resp->frame_count; i++) {
949                 u16 fstatus = le16_to_cpu(frame_status[i].status);
950
951                 if (status & AGG_TX_STATUS_MSK)
952                         iwlagn_count_agg_tx_err_status(priv, fstatus);
953
954                 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
955                               AGG_TX_STATE_ABORT_MSK))
956                         continue;
957
958                 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
959                                    "try-count (0x%08x)\n",
960                                    iwl_get_agg_tx_fail_reason(fstatus),
961                                    fstatus & AGG_TX_STATUS_MSK,
962                                    fstatus & AGG_TX_TRY_MSK);
963         }
964 }
965
966 #ifdef CONFIG_IWLWIFI_DEBUG
967 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
968
969 const char *iwl_get_agg_tx_fail_reason(u16 status)
970 {
971         status &= AGG_TX_STATUS_MSK;
972         switch (status) {
973         case AGG_TX_STATE_TRANSMITTED:
974                 return "SUCCESS";
975                 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
976                 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
977                 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
978                 AGG_TX_STATE_FAIL(ABORT_MSK);
979                 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
980                 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
981                 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
982                 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
983                 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
984                 AGG_TX_STATE_FAIL(RESPONSE_MSK);
985                 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
986                 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
987         }
988
989         return "UNKNOWN";
990 }
991 #endif /* CONFIG_IWLWIFI_DEBUG */
992
993 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
994 {
995         return le32_to_cpup((__le32 *)&tx_resp->status +
996                             tx_resp->frame_count) & MAX_SN;
997 }
998
999 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
1000 {
1001         status &= TX_STATUS_MSK;
1002
1003         switch (status) {
1004         case TX_STATUS_POSTPONE_DELAY:
1005                 priv->reply_tx_stats.pp_delay++;
1006                 break;
1007         case TX_STATUS_POSTPONE_FEW_BYTES:
1008                 priv->reply_tx_stats.pp_few_bytes++;
1009                 break;
1010         case TX_STATUS_POSTPONE_BT_PRIO:
1011                 priv->reply_tx_stats.pp_bt_prio++;
1012                 break;
1013         case TX_STATUS_POSTPONE_QUIET_PERIOD:
1014                 priv->reply_tx_stats.pp_quiet_period++;
1015                 break;
1016         case TX_STATUS_POSTPONE_CALC_TTAK:
1017                 priv->reply_tx_stats.pp_calc_ttak++;
1018                 break;
1019         case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
1020                 priv->reply_tx_stats.int_crossed_retry++;
1021                 break;
1022         case TX_STATUS_FAIL_SHORT_LIMIT:
1023                 priv->reply_tx_stats.short_limit++;
1024                 break;
1025         case TX_STATUS_FAIL_LONG_LIMIT:
1026                 priv->reply_tx_stats.long_limit++;
1027                 break;
1028         case TX_STATUS_FAIL_FIFO_UNDERRUN:
1029                 priv->reply_tx_stats.fifo_underrun++;
1030                 break;
1031         case TX_STATUS_FAIL_DRAIN_FLOW:
1032                 priv->reply_tx_stats.drain_flow++;
1033                 break;
1034         case TX_STATUS_FAIL_RFKILL_FLUSH:
1035                 priv->reply_tx_stats.rfkill_flush++;
1036                 break;
1037         case TX_STATUS_FAIL_LIFE_EXPIRE:
1038                 priv->reply_tx_stats.life_expire++;
1039                 break;
1040         case TX_STATUS_FAIL_DEST_PS:
1041                 priv->reply_tx_stats.dest_ps++;
1042                 break;
1043         case TX_STATUS_FAIL_HOST_ABORTED:
1044                 priv->reply_tx_stats.host_abort++;
1045                 break;
1046         case TX_STATUS_FAIL_BT_RETRY:
1047                 priv->reply_tx_stats.bt_retry++;
1048                 break;
1049         case TX_STATUS_FAIL_STA_INVALID:
1050                 priv->reply_tx_stats.sta_invalid++;
1051                 break;
1052         case TX_STATUS_FAIL_FRAG_DROPPED:
1053                 priv->reply_tx_stats.frag_drop++;
1054                 break;
1055         case TX_STATUS_FAIL_TID_DISABLE:
1056                 priv->reply_tx_stats.tid_disable++;
1057                 break;
1058         case TX_STATUS_FAIL_FIFO_FLUSHED:
1059                 priv->reply_tx_stats.fifo_flush++;
1060                 break;
1061         case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
1062                 priv->reply_tx_stats.insuff_cf_poll++;
1063                 break;
1064         case TX_STATUS_FAIL_PASSIVE_NO_RX:
1065                 priv->reply_tx_stats.fail_hw_drop++;
1066                 break;
1067         case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
1068                 priv->reply_tx_stats.sta_color_mismatch++;
1069                 break;
1070         default:
1071                 priv->reply_tx_stats.unknown++;
1072                 break;
1073         }
1074 }
1075
1076 static void iwlagn_set_tx_status(struct iwl_priv *priv,
1077                                  struct ieee80211_tx_info *info,
1078                                  struct iwlagn_tx_resp *tx_resp)
1079 {
1080         u16 status = le16_to_cpu(tx_resp->status.status);
1081
1082         info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1083
1084         info->status.rates[0].count = tx_resp->failure_frame + 1;
1085         info->flags |= iwl_tx_status_to_mac80211(status);
1086         iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
1087                                     info);
1088         if (!iwl_is_tx_success(status))
1089                 iwlagn_count_tx_err_status(priv, status);
1090 }
1091
1092 static void iwl_check_abort_status(struct iwl_priv *priv,
1093                             u8 frame_count, u32 status)
1094 {
1095         if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
1096                 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
1097                 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
1098                         queue_work(priv->workqueue, &priv->tx_flush);
1099         }
1100 }
1101
1102 int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb,
1103                                struct iwl_device_cmd *cmd)
1104 {
1105         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1106         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1107         int txq_id = SEQ_TO_QUEUE(sequence);
1108         int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
1109         struct iwlagn_tx_resp *tx_resp = (void *)pkt->data;
1110         struct ieee80211_hdr *hdr;
1111         u32 status = le16_to_cpu(tx_resp->status.status);
1112         u16 ssn = iwlagn_get_scd_ssn(tx_resp);
1113         int tid;
1114         int sta_id;
1115         int freed;
1116         struct ieee80211_tx_info *info;
1117         struct sk_buff_head skbs;
1118         struct sk_buff *skb;
1119         struct iwl_rxon_context *ctx;
1120         bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
1121         bool is_offchannel_skb;
1122
1123         tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
1124                 IWLAGN_TX_RES_TID_POS;
1125         sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
1126                 IWLAGN_TX_RES_RA_POS;
1127
1128         spin_lock(&priv->sta_lock);
1129
1130         if (is_agg)
1131                 iwl_rx_reply_tx_agg(priv, tx_resp);
1132
1133         __skb_queue_head_init(&skbs);
1134
1135         is_offchannel_skb = false;
1136
1137         if (tx_resp->frame_count == 1) {
1138                 u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl);
1139                 next_reclaimed = SEQ_TO_SN(next_reclaimed + 0x10);
1140
1141                 if (is_agg) {
1142                         /* If this is an aggregation queue, we can rely on the
1143                          * ssn since the wifi sequence number corresponds to
1144                          * the index in the TFD ring (%256).
1145                          * The seq_ctl is the sequence control of the packet
1146                          * to which this Tx response relates. But if there is a
1147                          * hole in the bitmap of the BA we received, this Tx
1148                          * response may allow to reclaim the hole and all the
1149                          * subsequent packets that were already acked.
1150                          * In that case, seq_ctl != ssn, and the next packet
1151                          * to be reclaimed will be ssn and not seq_ctl.
1152                          */
1153                         next_reclaimed = ssn;
1154                 }
1155
1156                 iwl_trans_reclaim(priv->trans, txq_id, ssn, &skbs);
1157
1158                 iwlagn_check_ratid_empty(priv, sta_id, tid);
1159                 freed = 0;
1160
1161                 /* process frames */
1162                 skb_queue_walk(&skbs, skb) {
1163                         hdr = (struct ieee80211_hdr *)skb->data;
1164
1165                         if (!ieee80211_is_data_qos(hdr->frame_control))
1166                                 priv->last_seq_ctl = tx_resp->seq_ctl;
1167
1168                         info = IEEE80211_SKB_CB(skb);
1169                         ctx = info->driver_data[0];
1170                         iwl_trans_free_tx_cmd(priv->trans,
1171                                               info->driver_data[1]);
1172
1173                         memset(&info->status, 0, sizeof(info->status));
1174
1175                         if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
1176                             iwl_is_associated_ctx(ctx) && ctx->vif &&
1177                             ctx->vif->type == NL80211_IFTYPE_STATION) {
1178                                 /* block and stop all queues */
1179                                 priv->passive_no_rx = true;
1180                                 IWL_DEBUG_TX_QUEUES(priv, "stop all queues: "
1181                                                     "passive channel");
1182                                 ieee80211_stop_queues(priv->hw);
1183
1184                                 IWL_DEBUG_TX_REPLY(priv,
1185                                            "TXQ %d status %s (0x%08x) "
1186                                            "rate_n_flags 0x%x retries %d\n",
1187                                            txq_id,
1188                                            iwl_get_tx_fail_reason(status),
1189                                            status,
1190                                            le32_to_cpu(tx_resp->rate_n_flags),
1191                                            tx_resp->failure_frame);
1192
1193                                 IWL_DEBUG_TX_REPLY(priv,
1194                                            "FrameCnt = %d, idx=%d\n",
1195                                            tx_resp->frame_count, cmd_index);
1196                         }
1197
1198                         /* check if BAR is needed */
1199                         if (is_agg && !iwl_is_tx_success(status))
1200                                 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1201                         iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
1202                                      tx_resp);
1203                         if (!is_agg)
1204                                 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
1205
1206                         /*
1207                          * W/A for FW bug - the seq_ctl isn't updated when the
1208                          * queues are flushed. Fetch it from the packet itself
1209                          */
1210                         if (!is_agg && status == TX_STATUS_FAIL_FIFO_FLUSHED) {
1211                                 next_reclaimed = le16_to_cpu(hdr->seq_ctrl);
1212                                 next_reclaimed =
1213                                         SEQ_TO_SN(next_reclaimed + 0x10);
1214                         }
1215
1216                         is_offchannel_skb =
1217                                 (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN);
1218                         freed++;
1219                 }
1220
1221                 if (tid != IWL_TID_NON_QOS) {
1222                         priv->tid_data[sta_id][tid].next_reclaimed =
1223                                 next_reclaimed;
1224                         IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d\n",
1225                                            next_reclaimed);
1226                 }
1227
1228                 WARN_ON(!is_agg && freed != 1);
1229
1230                 /*
1231                  * An offchannel frame can be send only on the AUX queue, where
1232                  * there is no aggregation (and reordering) so it only is single
1233                  * skb is expected to be processed.
1234                  */
1235                 WARN_ON(is_offchannel_skb && freed != 1);
1236         }
1237
1238         iwl_check_abort_status(priv, tx_resp->frame_count, status);
1239         spin_unlock(&priv->sta_lock);
1240
1241         while (!skb_queue_empty(&skbs)) {
1242                 skb = __skb_dequeue(&skbs);
1243                 ieee80211_tx_status(priv->hw, skb);
1244         }
1245
1246         if (is_offchannel_skb)
1247                 iwl_scan_offchannel_skb_status(priv);
1248
1249         return 0;
1250 }
1251
1252 /**
1253  * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1254  *
1255  * Handles block-acknowledge notification from device, which reports success
1256  * of frames sent via aggregation.
1257  */
1258 int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1259                                    struct iwl_rx_cmd_buffer *rxb,
1260                                    struct iwl_device_cmd *cmd)
1261 {
1262         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1263         struct iwl_compressed_ba_resp *ba_resp = (void *)pkt->data;
1264         struct iwl_ht_agg *agg;
1265         struct sk_buff_head reclaimed_skbs;
1266         struct ieee80211_tx_info *info;
1267         struct ieee80211_hdr *hdr;
1268         struct sk_buff *skb;
1269         int sta_id;
1270         int tid;
1271         int freed;
1272
1273         /* "flow" corresponds to Tx queue */
1274         u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1275
1276         /* "ssn" is start of block-ack Tx window, corresponds to index
1277          * (in Tx queue's circular buffer) of first TFD/frame in window */
1278         u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1279
1280         if (scd_flow >= priv->cfg->base_params->num_of_queues) {
1281                 IWL_ERR(priv,
1282                         "BUG_ON scd_flow is bigger than number of queues\n");
1283                 return 0;
1284         }
1285
1286         sta_id = ba_resp->sta_id;
1287         tid = ba_resp->tid;
1288         agg = &priv->tid_data[sta_id][tid].agg;
1289
1290         spin_lock(&priv->sta_lock);
1291
1292         if (unlikely(!agg->wait_for_ba)) {
1293                 if (unlikely(ba_resp->bitmap))
1294                         IWL_ERR(priv, "Received BA when not expected\n");
1295                 spin_unlock(&priv->sta_lock);
1296                 return 0;
1297         }
1298
1299         if (unlikely(scd_flow != agg->txq_id)) {
1300                 /*
1301                  * FIXME: this is a uCode bug which need to be addressed,
1302                  * log the information and return for now.
1303                  * Since it is can possibly happen very often and in order
1304                  * not to fill the syslog, don't use IWL_ERR or IWL_WARN
1305                  */
1306                 IWL_DEBUG_TX_QUEUES(priv,
1307                                     "Bad queue mapping txq_id=%d, agg_txq[sta:%d,tid:%d]=%d\n",
1308                                     scd_flow, sta_id, tid, agg->txq_id);
1309                 spin_unlock(&priv->sta_lock);
1310                 return 0;
1311         }
1312
1313         __skb_queue_head_init(&reclaimed_skbs);
1314
1315         /* Release all TFDs before the SSN, i.e. all TFDs in front of
1316          * block-ack window (we assume that they've been successfully
1317          * transmitted ... if not, it's too late anyway). */
1318         iwl_trans_reclaim(priv->trans, scd_flow, ba_resp_scd_ssn,
1319                           &reclaimed_skbs);
1320
1321         IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1322                            "sta_id = %d\n",
1323                            agg->wait_for_ba,
1324                            (u8 *) &ba_resp->sta_addr_lo32,
1325                            ba_resp->sta_id);
1326         IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
1327                            "scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
1328                            ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl),
1329                            (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1330                            scd_flow, ba_resp_scd_ssn, ba_resp->txed,
1331                            ba_resp->txed_2_done);
1332
1333         /* Mark that the expected block-ack response arrived */
1334         agg->wait_for_ba = false;
1335
1336         /* Sanity check values reported by uCode */
1337         if (ba_resp->txed_2_done > ba_resp->txed) {
1338                 IWL_DEBUG_TX_REPLY(priv,
1339                         "bogus sent(%d) and ack(%d) count\n",
1340                         ba_resp->txed, ba_resp->txed_2_done);
1341                 /*
1342                  * set txed_2_done = txed,
1343                  * so it won't impact rate scale
1344                  */
1345                 ba_resp->txed = ba_resp->txed_2_done;
1346         }
1347
1348         priv->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn;
1349
1350         iwlagn_check_ratid_empty(priv, sta_id, tid);
1351         freed = 0;
1352
1353         skb_queue_walk(&reclaimed_skbs, skb) {
1354                 hdr = (struct ieee80211_hdr *)skb->data;
1355
1356                 if (ieee80211_is_data_qos(hdr->frame_control))
1357                         freed++;
1358                 else
1359                         WARN_ON_ONCE(1);
1360
1361                 info = IEEE80211_SKB_CB(skb);
1362                 iwl_trans_free_tx_cmd(priv->trans, info->driver_data[1]);
1363
1364                 if (freed == 1) {
1365                         /* this is the first skb we deliver in this batch */
1366                         /* put the rate scaling data there */
1367                         info = IEEE80211_SKB_CB(skb);
1368                         memset(&info->status, 0, sizeof(info->status));
1369                         info->flags |= IEEE80211_TX_STAT_ACK;
1370                         info->flags |= IEEE80211_TX_STAT_AMPDU;
1371                         info->status.ampdu_ack_len = ba_resp->txed_2_done;
1372                         info->status.ampdu_len = ba_resp->txed;
1373                         iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1374                                                     info);
1375                 }
1376         }
1377
1378         spin_unlock(&priv->sta_lock);
1379
1380         while (!skb_queue_empty(&reclaimed_skbs)) {
1381                 skb = __skb_dequeue(&reclaimed_skbs);
1382                 ieee80211_tx_status(priv->hw, skb);
1383         }
1384
1385         return 0;
1386 }