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iwlagn: move the check_empty logic to the transport layer
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-agn-tx.c
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *
28 *****************************************************************************/
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/sched.h>
34 #include <linux/ieee80211.h>
35
36 #include "iwl-dev.h"
37 #include "iwl-core.h"
38 #include "iwl-sta.h"
39 #include "iwl-io.h"
40 #include "iwl-helpers.h"
41 #include "iwl-agn-hw.h"
42 #include "iwl-agn.h"
43 #include "iwl-trans.h"
44
45 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
46 struct ieee80211_tx_info *info,
47 __le16 fc, __le32 *tx_flags)
48 {
49 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
50 info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
51 info->flags & IEEE80211_TX_CTL_AMPDU)
52 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
53 }
54
55 /*
56 * handle build REPLY_TX command notification.
57 */
58 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
59 struct sk_buff *skb,
60 struct iwl_tx_cmd *tx_cmd,
61 struct ieee80211_tx_info *info,
62 struct ieee80211_hdr *hdr, u8 sta_id)
63 {
64 __le16 fc = hdr->frame_control;
65 __le32 tx_flags = tx_cmd->tx_flags;
66
67 tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
68
69 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
70 tx_flags |= TX_CMD_FLG_ACK_MSK;
71 else
72 tx_flags &= ~TX_CMD_FLG_ACK_MSK;
73
74 if (ieee80211_is_probe_resp(fc))
75 tx_flags |= TX_CMD_FLG_TSF_MSK;
76 else if (ieee80211_is_back_req(fc))
77 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
78 else if (info->band == IEEE80211_BAND_2GHZ &&
79 priv->cfg->bt_params &&
80 priv->cfg->bt_params->advanced_bt_coexist &&
81 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
82 ieee80211_is_reassoc_req(fc) ||
83 skb->protocol == cpu_to_be16(ETH_P_PAE)))
84 tx_flags |= TX_CMD_FLG_IGNORE_BT;
85
86
87 tx_cmd->sta_id = sta_id;
88 if (ieee80211_has_morefrags(fc))
89 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
90
91 if (ieee80211_is_data_qos(fc)) {
92 u8 *qc = ieee80211_get_qos_ctl(hdr);
93 tx_cmd->tid_tspec = qc[0] & 0xf;
94 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
95 } else {
96 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
97 }
98
99 iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
100
101 tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
102 if (ieee80211_is_mgmt(fc)) {
103 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
104 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
105 else
106 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
107 } else {
108 tx_cmd->timeout.pm_frame_timeout = 0;
109 }
110
111 tx_cmd->driver_txop = 0;
112 tx_cmd->tx_flags = tx_flags;
113 tx_cmd->next_frame_len = 0;
114 }
115
116 #define RTS_DFAULT_RETRY_LIMIT 60
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 /* Set retry limit on DATA packets and Probe Responses*/
130 if (ieee80211_is_probe_resp(fc))
131 data_retry_limit = 3;
132 else
133 data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
134 tx_cmd->data_retry_limit = data_retry_limit;
135
136 /* Set retry limit on RTS packets */
137 rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
138 if (data_retry_limit < rts_retry_limit)
139 rts_retry_limit = data_retry_limit;
140 tx_cmd->rts_retry_limit = rts_retry_limit;
141
142 /* DATA packets will use the uCode station table for rate/antenna
143 * selection */
144 if (ieee80211_is_data(fc)) {
145 tx_cmd->initial_rate_index = 0;
146 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
147 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
148 if (priv->tm_fixed_rate) {
149 /*
150 * rate overwrite by testmode
151 * we not only send lq command to change rate
152 * we also re-enforce per data pkt base.
153 */
154 tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
155 memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
156 sizeof(tx_cmd->rate_n_flags));
157 }
158 #endif
159 return;
160 }
161
162 /**
163 * If the current TX rate stored in mac80211 has the MCS bit set, it's
164 * not really a TX rate. Thus, we use the lowest supported rate for
165 * this band. Also use the lowest supported rate if the stored rate
166 * index is invalid.
167 */
168 rate_idx = info->control.rates[0].idx;
169 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
170 (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
171 rate_idx = rate_lowest_index(&priv->bands[info->band],
172 info->control.sta);
173 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
174 if (info->band == IEEE80211_BAND_5GHZ)
175 rate_idx += IWL_FIRST_OFDM_RATE;
176 /* Get PLCP rate for tx_cmd->rate_n_flags */
177 rate_plcp = iwl_rates[rate_idx].plcp;
178 /* Zero out flags for this packet */
179 rate_flags = 0;
180
181 /* Set CCK flag as needed */
182 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
183 rate_flags |= RATE_MCS_CCK_MSK;
184
185 /* Set up antennas */
186 if (priv->cfg->bt_params &&
187 priv->cfg->bt_params->advanced_bt_coexist &&
188 priv->bt_full_concurrent) {
189 /* operated as 1x1 in full concurrency mode */
190 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
191 first_antenna(hw_params(priv).valid_tx_ant));
192 } else
193 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
194 hw_params(priv).valid_tx_ant);
195 rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
196
197 /* Set the rate in the TX cmd */
198 tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
199 }
200
201 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
202 struct ieee80211_tx_info *info,
203 struct iwl_tx_cmd *tx_cmd,
204 struct sk_buff *skb_frag,
205 int sta_id)
206 {
207 struct ieee80211_key_conf *keyconf = info->control.hw_key;
208
209 switch (keyconf->cipher) {
210 case WLAN_CIPHER_SUITE_CCMP:
211 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
212 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
213 if (info->flags & IEEE80211_TX_CTL_AMPDU)
214 tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
215 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
216 break;
217
218 case WLAN_CIPHER_SUITE_TKIP:
219 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
220 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
221 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
222 break;
223
224 case WLAN_CIPHER_SUITE_WEP104:
225 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
226 /* fall through */
227 case WLAN_CIPHER_SUITE_WEP40:
228 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
229 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
230
231 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
232
233 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
234 "with key %d\n", keyconf->keyidx);
235 break;
236
237 default:
238 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
239 break;
240 }
241 }
242
243 /*
244 * start REPLY_TX command process
245 */
246 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
247 {
248 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
249 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
250 struct iwl_station_priv *sta_priv = NULL;
251 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
252 struct iwl_device_cmd *dev_cmd = NULL;
253 struct iwl_tx_cmd *tx_cmd;
254
255 __le16 fc;
256 u8 hdr_len;
257 u16 len;
258 u8 sta_id;
259 unsigned long flags;
260 bool is_agg = false;
261
262 if (info->control.vif)
263 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
264
265 spin_lock_irqsave(&priv->shrd->lock, flags);
266 if (iwl_is_rfkill(priv->shrd)) {
267 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
268 goto drop_unlock_priv;
269 }
270
271 fc = hdr->frame_control;
272
273 #ifdef CONFIG_IWLWIFI_DEBUG
274 if (ieee80211_is_auth(fc))
275 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
276 else if (ieee80211_is_assoc_req(fc))
277 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
278 else if (ieee80211_is_reassoc_req(fc))
279 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
280 #endif
281
282 hdr_len = ieee80211_hdrlen(fc);
283
284 /* For management frames use broadcast id to do not break aggregation */
285 if (!ieee80211_is_data(fc))
286 sta_id = ctx->bcast_sta_id;
287 else {
288 /* Find index into station table for destination station */
289 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
290 if (sta_id == IWL_INVALID_STATION) {
291 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
292 hdr->addr1);
293 goto drop_unlock_priv;
294 }
295 }
296
297 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
298
299 if (info->control.sta)
300 sta_priv = (void *)info->control.sta->drv_priv;
301
302 if (sta_priv && sta_priv->asleep &&
303 (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
304 /*
305 * This sends an asynchronous command to the device,
306 * but we can rely on it being processed before the
307 * next frame is processed -- and the next frame to
308 * this station is the one that will consume this
309 * counter.
310 * For now set the counter to just 1 since we do not
311 * support uAPSD yet.
312 */
313 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
314 }
315
316 /* irqs already disabled/saved above when locking priv->shrd->lock */
317 spin_lock(&priv->shrd->sta_lock);
318
319 dev_cmd = kmem_cache_alloc(priv->tx_cmd_pool, GFP_ATOMIC);
320
321 if (unlikely(!dev_cmd))
322 goto drop_unlock_sta;
323
324 memset(dev_cmd, 0, sizeof(*dev_cmd));
325 tx_cmd = &dev_cmd->cmd.tx;
326
327 /* Copy MAC header from skb into command buffer */
328 memcpy(tx_cmd->hdr, hdr, hdr_len);
329
330 /* Total # bytes to be transmitted */
331 len = (u16)skb->len;
332 tx_cmd->len = cpu_to_le16(len);
333
334 if (info->control.hw_key)
335 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
336
337 /* TODO need this for burst mode later on */
338 iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
339 iwl_dbg_log_tx_data_frame(priv, len, hdr);
340
341 iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
342
343 iwl_update_stats(priv, true, fc, len);
344
345 info->driver_data[0] = ctx;
346 info->driver_data[1] = dev_cmd;
347
348 if (iwl_trans_tx(trans(priv), skb, dev_cmd, ctx->ctxid, sta_id))
349 goto drop_unlock_sta;
350
351 spin_unlock(&priv->shrd->sta_lock);
352 spin_unlock_irqrestore(&priv->shrd->lock, flags);
353
354 /*
355 * Avoid atomic ops if it isn't an associated client.
356 * Also, if this is a packet for aggregation, don't
357 * increase the counter because the ucode will stop
358 * aggregation queues when their respective station
359 * goes to sleep.
360 */
361 if (sta_priv && sta_priv->client && !is_agg)
362 atomic_inc(&sta_priv->pending_frames);
363
364 return 0;
365
366 drop_unlock_sta:
367 if (dev_cmd)
368 kmem_cache_free(priv->tx_cmd_pool, dev_cmd);
369 spin_unlock(&priv->shrd->sta_lock);
370 drop_unlock_priv:
371 spin_unlock_irqrestore(&priv->shrd->lock, flags);
372 return -1;
373 }
374
375 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
376 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
377 {
378 struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
379 int sta_id;
380 int ret;
381
382 IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
383 sta->addr, tid);
384
385 sta_id = iwl_sta_id(sta);
386 if (sta_id == IWL_INVALID_STATION) {
387 IWL_ERR(priv, "Start AGG on invalid station\n");
388 return -ENXIO;
389 }
390 if (unlikely(tid >= IWL_MAX_TID_COUNT))
391 return -EINVAL;
392
393 if (priv->shrd->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
394 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
395 return -ENXIO;
396 }
397
398 ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
399 if (ret)
400 return ret;
401
402 ret = iwl_trans_tx_agg_alloc(trans(priv), vif_priv->ctx->ctxid, sta_id,
403 tid, ssn);
404
405 return ret;
406 }
407
408 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
409 struct ieee80211_sta *sta, u16 tid)
410 {
411 int txq_id, sta_id, ssn;
412 struct iwl_tid_data *tid_data;
413 int write_ptr, read_ptr;
414 unsigned long flags;
415
416 sta_id = iwl_sta_id(sta);
417
418 if (sta_id == IWL_INVALID_STATION) {
419 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
420 return -ENXIO;
421 }
422
423 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
424
425 tid_data = &priv->shrd->tid_data[sta_id][tid];
426 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
427 txq_id = tid_data->agg.txq_id;
428
429 switch (priv->shrd->tid_data[sta_id][tid].agg.state) {
430 case IWL_EMPTYING_HW_QUEUE_ADDBA:
431 /*
432 * This can happen if the peer stops aggregation
433 * again before we've had a chance to drain the
434 * queue we selected previously, i.e. before the
435 * session was really started completely.
436 */
437 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
438 goto turn_off;
439 case IWL_AGG_ON:
440 break;
441 default:
442 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
443 }
444
445 write_ptr = priv->txq[txq_id].q.write_ptr;
446 read_ptr = priv->txq[txq_id].q.read_ptr;
447
448 /* The queue is not empty */
449 if (write_ptr != read_ptr) {
450 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
451 priv->shrd->tid_data[sta_id][tid].agg.state =
452 IWL_EMPTYING_HW_QUEUE_DELBA;
453 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
454 return 0;
455 }
456
457 IWL_DEBUG_HT(priv, "HW queue is empty\n");
458 turn_off:
459 priv->shrd->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF;
460
461 /* do not restore/save irqs */
462 spin_unlock(&priv->shrd->sta_lock);
463 spin_lock(&priv->shrd->lock);
464
465 /*
466 * the only reason this call can fail is queue number out of range,
467 * which can happen if uCode is reloaded and all the station
468 * information are lost. if it is outside the range, there is no need
469 * to deactivate the uCode queue, just return "success" to allow
470 * mac80211 to clean up it own data.
471 */
472 iwl_trans_txq_agg_disable(trans(priv), txq_id);
473 spin_unlock_irqrestore(&priv->shrd->lock, flags);
474
475 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
476
477 return 0;
478 }
479
480 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
481 struct iwl_rxon_context *ctx,
482 const u8 *addr1)
483 {
484 struct ieee80211_sta *sta;
485 struct iwl_station_priv *sta_priv;
486
487 rcu_read_lock();
488 sta = ieee80211_find_sta(ctx->vif, addr1);
489 if (sta) {
490 sta_priv = (void *)sta->drv_priv;
491 /* avoid atomic ops if this isn't a client */
492 if (sta_priv->client &&
493 atomic_dec_return(&sta_priv->pending_frames) == 0)
494 ieee80211_sta_block_awake(priv->hw, sta, false);
495 }
496 rcu_read_unlock();
497 }
498
499 /**
500 * translate ucode response to mac80211 tx status control values
501 */
502 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
503 struct ieee80211_tx_info *info)
504 {
505 struct ieee80211_tx_rate *r = &info->control.rates[0];
506
507 info->antenna_sel_tx =
508 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
509 if (rate_n_flags & RATE_MCS_HT_MSK)
510 r->flags |= IEEE80211_TX_RC_MCS;
511 if (rate_n_flags & RATE_MCS_GF_MSK)
512 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
513 if (rate_n_flags & RATE_MCS_HT40_MSK)
514 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
515 if (rate_n_flags & RATE_MCS_DUP_MSK)
516 r->flags |= IEEE80211_TX_RC_DUP_DATA;
517 if (rate_n_flags & RATE_MCS_SGI_MSK)
518 r->flags |= IEEE80211_TX_RC_SHORT_GI;
519 r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
520 }
521
522 #ifdef CONFIG_IWLWIFI_DEBUG
523 const char *iwl_get_tx_fail_reason(u32 status)
524 {
525 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
526 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
527
528 switch (status & TX_STATUS_MSK) {
529 case TX_STATUS_SUCCESS:
530 return "SUCCESS";
531 TX_STATUS_POSTPONE(DELAY);
532 TX_STATUS_POSTPONE(FEW_BYTES);
533 TX_STATUS_POSTPONE(BT_PRIO);
534 TX_STATUS_POSTPONE(QUIET_PERIOD);
535 TX_STATUS_POSTPONE(CALC_TTAK);
536 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
537 TX_STATUS_FAIL(SHORT_LIMIT);
538 TX_STATUS_FAIL(LONG_LIMIT);
539 TX_STATUS_FAIL(FIFO_UNDERRUN);
540 TX_STATUS_FAIL(DRAIN_FLOW);
541 TX_STATUS_FAIL(RFKILL_FLUSH);
542 TX_STATUS_FAIL(LIFE_EXPIRE);
543 TX_STATUS_FAIL(DEST_PS);
544 TX_STATUS_FAIL(HOST_ABORTED);
545 TX_STATUS_FAIL(BT_RETRY);
546 TX_STATUS_FAIL(STA_INVALID);
547 TX_STATUS_FAIL(FRAG_DROPPED);
548 TX_STATUS_FAIL(TID_DISABLE);
549 TX_STATUS_FAIL(FIFO_FLUSHED);
550 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
551 TX_STATUS_FAIL(PASSIVE_NO_RX);
552 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
553 }
554
555 return "UNKNOWN";
556
557 #undef TX_STATUS_FAIL
558 #undef TX_STATUS_POSTPONE
559 }
560 #endif /* CONFIG_IWLWIFI_DEBUG */
561
562 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
563 {
564 status &= AGG_TX_STATUS_MSK;
565
566 switch (status) {
567 case AGG_TX_STATE_UNDERRUN_MSK:
568 priv->reply_agg_tx_stats.underrun++;
569 break;
570 case AGG_TX_STATE_BT_PRIO_MSK:
571 priv->reply_agg_tx_stats.bt_prio++;
572 break;
573 case AGG_TX_STATE_FEW_BYTES_MSK:
574 priv->reply_agg_tx_stats.few_bytes++;
575 break;
576 case AGG_TX_STATE_ABORT_MSK:
577 priv->reply_agg_tx_stats.abort++;
578 break;
579 case AGG_TX_STATE_LAST_SENT_TTL_MSK:
580 priv->reply_agg_tx_stats.last_sent_ttl++;
581 break;
582 case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
583 priv->reply_agg_tx_stats.last_sent_try++;
584 break;
585 case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
586 priv->reply_agg_tx_stats.last_sent_bt_kill++;
587 break;
588 case AGG_TX_STATE_SCD_QUERY_MSK:
589 priv->reply_agg_tx_stats.scd_query++;
590 break;
591 case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
592 priv->reply_agg_tx_stats.bad_crc32++;
593 break;
594 case AGG_TX_STATE_RESPONSE_MSK:
595 priv->reply_agg_tx_stats.response++;
596 break;
597 case AGG_TX_STATE_DUMP_TX_MSK:
598 priv->reply_agg_tx_stats.dump_tx++;
599 break;
600 case AGG_TX_STATE_DELAY_TX_MSK:
601 priv->reply_agg_tx_stats.delay_tx++;
602 break;
603 default:
604 priv->reply_agg_tx_stats.unknown++;
605 break;
606 }
607 }
608
609 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
610 struct iwlagn_tx_resp *tx_resp)
611 {
612 struct agg_tx_status *frame_status = &tx_resp->status;
613 int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
614 IWLAGN_TX_RES_TID_POS;
615 int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
616 IWLAGN_TX_RES_RA_POS;
617 struct iwl_ht_agg *agg = &priv->shrd->tid_data[sta_id][tid].agg;
618 u32 status = le16_to_cpu(tx_resp->status.status);
619 int i;
620
621 if (agg->wait_for_ba)
622 IWL_DEBUG_TX_REPLY(priv,
623 "got tx response w/o block-ack\n");
624
625 agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
626 agg->wait_for_ba = (tx_resp->frame_count > 1);
627
628 /*
629 * If the BT kill count is non-zero, we'll get this
630 * notification again.
631 */
632 if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
633 priv->cfg->bt_params &&
634 priv->cfg->bt_params->advanced_bt_coexist) {
635 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
636 }
637
638 /* Construct bit-map of pending frames within Tx window */
639 for (i = 0; i < tx_resp->frame_count; i++) {
640 u16 fstatus = le16_to_cpu(frame_status[i].status);
641
642 if (status & AGG_TX_STATUS_MSK)
643 iwlagn_count_agg_tx_err_status(priv, fstatus);
644
645 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
646 AGG_TX_STATE_ABORT_MSK))
647 continue;
648
649 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
650 "try-count (0x%08x)\n",
651 iwl_get_agg_tx_fail_reason(fstatus),
652 fstatus & AGG_TX_STATUS_MSK,
653 fstatus & AGG_TX_TRY_MSK);
654 }
655 }
656
657 #ifdef CONFIG_IWLWIFI_DEBUG
658 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
659
660 const char *iwl_get_agg_tx_fail_reason(u16 status)
661 {
662 status &= AGG_TX_STATUS_MSK;
663 switch (status) {
664 case AGG_TX_STATE_TRANSMITTED:
665 return "SUCCESS";
666 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
667 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
668 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
669 AGG_TX_STATE_FAIL(ABORT_MSK);
670 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
671 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
672 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
673 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
674 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
675 AGG_TX_STATE_FAIL(RESPONSE_MSK);
676 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
677 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
678 }
679
680 return "UNKNOWN";
681 }
682 #endif /* CONFIG_IWLWIFI_DEBUG */
683
684 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
685 {
686 return le32_to_cpup((__le32 *)&tx_resp->status +
687 tx_resp->frame_count) & MAX_SN;
688 }
689
690 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
691 {
692 status &= TX_STATUS_MSK;
693
694 switch (status) {
695 case TX_STATUS_POSTPONE_DELAY:
696 priv->reply_tx_stats.pp_delay++;
697 break;
698 case TX_STATUS_POSTPONE_FEW_BYTES:
699 priv->reply_tx_stats.pp_few_bytes++;
700 break;
701 case TX_STATUS_POSTPONE_BT_PRIO:
702 priv->reply_tx_stats.pp_bt_prio++;
703 break;
704 case TX_STATUS_POSTPONE_QUIET_PERIOD:
705 priv->reply_tx_stats.pp_quiet_period++;
706 break;
707 case TX_STATUS_POSTPONE_CALC_TTAK:
708 priv->reply_tx_stats.pp_calc_ttak++;
709 break;
710 case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
711 priv->reply_tx_stats.int_crossed_retry++;
712 break;
713 case TX_STATUS_FAIL_SHORT_LIMIT:
714 priv->reply_tx_stats.short_limit++;
715 break;
716 case TX_STATUS_FAIL_LONG_LIMIT:
717 priv->reply_tx_stats.long_limit++;
718 break;
719 case TX_STATUS_FAIL_FIFO_UNDERRUN:
720 priv->reply_tx_stats.fifo_underrun++;
721 break;
722 case TX_STATUS_FAIL_DRAIN_FLOW:
723 priv->reply_tx_stats.drain_flow++;
724 break;
725 case TX_STATUS_FAIL_RFKILL_FLUSH:
726 priv->reply_tx_stats.rfkill_flush++;
727 break;
728 case TX_STATUS_FAIL_LIFE_EXPIRE:
729 priv->reply_tx_stats.life_expire++;
730 break;
731 case TX_STATUS_FAIL_DEST_PS:
732 priv->reply_tx_stats.dest_ps++;
733 break;
734 case TX_STATUS_FAIL_HOST_ABORTED:
735 priv->reply_tx_stats.host_abort++;
736 break;
737 case TX_STATUS_FAIL_BT_RETRY:
738 priv->reply_tx_stats.bt_retry++;
739 break;
740 case TX_STATUS_FAIL_STA_INVALID:
741 priv->reply_tx_stats.sta_invalid++;
742 break;
743 case TX_STATUS_FAIL_FRAG_DROPPED:
744 priv->reply_tx_stats.frag_drop++;
745 break;
746 case TX_STATUS_FAIL_TID_DISABLE:
747 priv->reply_tx_stats.tid_disable++;
748 break;
749 case TX_STATUS_FAIL_FIFO_FLUSHED:
750 priv->reply_tx_stats.fifo_flush++;
751 break;
752 case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
753 priv->reply_tx_stats.insuff_cf_poll++;
754 break;
755 case TX_STATUS_FAIL_PASSIVE_NO_RX:
756 priv->reply_tx_stats.fail_hw_drop++;
757 break;
758 case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
759 priv->reply_tx_stats.sta_color_mismatch++;
760 break;
761 default:
762 priv->reply_tx_stats.unknown++;
763 break;
764 }
765 }
766
767 static void iwlagn_set_tx_status(struct iwl_priv *priv,
768 struct ieee80211_tx_info *info,
769 struct iwlagn_tx_resp *tx_resp,
770 bool is_agg)
771 {
772 u16 status = le16_to_cpu(tx_resp->status.status);
773
774 info->status.rates[0].count = tx_resp->failure_frame + 1;
775 if (is_agg)
776 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
777 info->flags |= iwl_tx_status_to_mac80211(status);
778 iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
779 info);
780 if (!iwl_is_tx_success(status))
781 iwlagn_count_tx_err_status(priv, status);
782 }
783
784 static void iwl_check_abort_status(struct iwl_priv *priv,
785 u8 frame_count, u32 status)
786 {
787 if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
788 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
789 if (!test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
790 queue_work(priv->shrd->workqueue, &priv->tx_flush);
791 }
792 }
793
794 void iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
795 {
796 struct iwl_rx_packet *pkt = rxb_addr(rxb);
797 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
798 int txq_id = SEQ_TO_QUEUE(sequence);
799 int cmd_index = SEQ_TO_INDEX(sequence);
800 struct iwl_tx_queue *txq = &priv->txq[txq_id];
801 struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
802 struct ieee80211_hdr *hdr;
803 u32 status = le16_to_cpu(tx_resp->status.status);
804 u32 ssn = iwlagn_get_scd_ssn(tx_resp);
805 int tid;
806 int sta_id;
807 int freed;
808 struct ieee80211_tx_info *info;
809 unsigned long flags;
810 struct sk_buff_head skbs;
811 struct sk_buff *skb;
812 struct iwl_rxon_context *ctx;
813
814 if ((cmd_index >= txq->q.n_bd) ||
815 (iwl_queue_used(&txq->q, cmd_index) == 0)) {
816 IWL_ERR(priv, "%s: Read index for DMA queue txq_id (%d) "
817 "cmd_index %d is out of range [0-%d] %d %d\n",
818 __func__, txq_id, cmd_index, txq->q.n_bd,
819 txq->q.write_ptr, txq->q.read_ptr);
820 return;
821 }
822
823 txq->time_stamp = jiffies;
824
825 tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
826 IWLAGN_TX_RES_TID_POS;
827 sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
828 IWLAGN_TX_RES_RA_POS;
829
830 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
831
832 if (txq->sched_retry)
833 iwl_rx_reply_tx_agg(priv, tx_resp);
834
835 if (tx_resp->frame_count == 1) {
836 bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
837
838 __skb_queue_head_init(&skbs);
839 /*we can free until ssn % q.n_bd not inclusive */
840 iwl_trans_reclaim(trans(priv), sta_id, tid, txq_id,
841 ssn, status, &skbs);
842 freed = 0;
843 while (!skb_queue_empty(&skbs)) {
844 skb = __skb_dequeue(&skbs);
845 hdr = (struct ieee80211_hdr *)skb->data;
846
847 if (!ieee80211_is_data_qos(hdr->frame_control))
848 priv->last_seq_ctl = tx_resp->seq_ctl;
849
850 info = IEEE80211_SKB_CB(skb);
851 ctx = info->driver_data[0];
852 kmem_cache_free(priv->tx_cmd_pool,
853 (info->driver_data[1]));
854
855 memset(&info->status, 0, sizeof(info->status));
856
857 if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
858 iwl_is_associated_ctx(ctx) && ctx->vif &&
859 ctx->vif->type == NL80211_IFTYPE_STATION) {
860 ctx->last_tx_rejected = true;
861 iwl_stop_queue(priv, &priv->txq[txq_id]);
862
863 IWL_DEBUG_TX_REPLY(priv,
864 "TXQ %d status %s (0x%08x) "
865 "rate_n_flags 0x%x retries %d\n",
866 txq_id,
867 iwl_get_tx_fail_reason(status),
868 status,
869 le32_to_cpu(tx_resp->rate_n_flags),
870 tx_resp->failure_frame);
871
872 IWL_DEBUG_TX_REPLY(priv,
873 "FrameCnt = %d, idx=%d\n",
874 tx_resp->frame_count, cmd_index);
875 }
876
877 /* check if BAR is needed */
878 if (is_agg && !iwl_is_tx_success(status))
879 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
880 iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
881 tx_resp, is_agg);
882 if (!is_agg)
883 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
884
885 ieee80211_tx_status_irqsafe(priv->hw, skb);
886
887 freed++;
888 }
889
890 WARN_ON(!is_agg && freed != 1);
891 }
892
893 iwl_check_abort_status(priv, tx_resp->frame_count, status);
894 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
895 }
896
897 /**
898 * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
899 *
900 * Handles block-acknowledge notification from device, which reports success
901 * of frames sent via aggregation.
902 */
903 void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
904 struct iwl_rx_mem_buffer *rxb)
905 {
906 struct iwl_rx_packet *pkt = rxb_addr(rxb);
907 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
908 struct iwl_tx_queue *txq = NULL;
909 struct iwl_ht_agg *agg;
910 struct sk_buff_head reclaimed_skbs;
911 struct ieee80211_tx_info *info;
912 struct ieee80211_hdr *hdr;
913 struct sk_buff *skb;
914 unsigned long flags;
915 int index;
916 int sta_id;
917 int tid;
918 int freed;
919
920 /* "flow" corresponds to Tx queue */
921 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
922
923 /* "ssn" is start of block-ack Tx window, corresponds to index
924 * (in Tx queue's circular buffer) of first TFD/frame in window */
925 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
926
927 if (scd_flow >= hw_params(priv).max_txq_num) {
928 IWL_ERR(priv,
929 "BUG_ON scd_flow is bigger than number of queues\n");
930 return;
931 }
932
933 txq = &priv->txq[scd_flow];
934 sta_id = ba_resp->sta_id;
935 tid = ba_resp->tid;
936 agg = &priv->shrd->tid_data[sta_id][tid].agg;
937
938 /* Find index of block-ack window */
939 index = ba_resp_scd_ssn & (txq->q.n_bd - 1);
940
941 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
942
943 if (unlikely(agg->txq_id != scd_flow)) {
944 /*
945 * FIXME: this is a uCode bug which need to be addressed,
946 * log the information and return for now!
947 * since it is possible happen very often and in order
948 * not to fill the syslog, don't enable the logging by default
949 */
950 IWL_DEBUG_TX_REPLY(priv,
951 "BA scd_flow %d does not match txq_id %d\n",
952 scd_flow, agg->txq_id);
953 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
954 return;
955 }
956
957 if (unlikely(!agg->wait_for_ba)) {
958 if (unlikely(ba_resp->bitmap))
959 IWL_ERR(priv, "Received BA when not expected\n");
960 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
961 return;
962 }
963
964 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
965 "sta_id = %d\n",
966 agg->wait_for_ba,
967 (u8 *) &ba_resp->sta_addr_lo32,
968 ba_resp->sta_id);
969 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
970 "scd_flow = %d, scd_ssn = %d\n",
971 ba_resp->tid,
972 ba_resp->seq_ctl,
973 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
974 ba_resp->scd_flow,
975 ba_resp->scd_ssn);
976
977 /* Mark that the expected block-ack response arrived */
978 agg->wait_for_ba = 0;
979
980 /* Sanity check values reported by uCode */
981 if (ba_resp->txed_2_done > ba_resp->txed) {
982 IWL_DEBUG_TX_REPLY(priv,
983 "bogus sent(%d) and ack(%d) count\n",
984 ba_resp->txed, ba_resp->txed_2_done);
985 /*
986 * set txed_2_done = txed,
987 * so it won't impact rate scale
988 */
989 ba_resp->txed = ba_resp->txed_2_done;
990 }
991 IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
992 ba_resp->txed, ba_resp->txed_2_done);
993
994 __skb_queue_head_init(&reclaimed_skbs);
995
996 /* Release all TFDs before the SSN, i.e. all TFDs in front of
997 * block-ack window (we assume that they've been successfully
998 * transmitted ... if not, it's too late anyway). */
999 iwl_trans_reclaim(trans(priv), sta_id, tid, scd_flow, ba_resp_scd_ssn,
1000 0, &reclaimed_skbs);
1001 freed = 0;
1002 while (!skb_queue_empty(&reclaimed_skbs)) {
1003
1004 skb = __skb_dequeue(&reclaimed_skbs);
1005 hdr = (struct ieee80211_hdr *)skb->data;
1006
1007 if (ieee80211_is_data_qos(hdr->frame_control))
1008 freed++;
1009 else
1010 WARN_ON_ONCE(1);
1011
1012 if (freed == 0) {
1013 /* this is the first skb we deliver in this batch */
1014 /* put the rate scaling data there */
1015 info = IEEE80211_SKB_CB(skb);
1016 memset(&info->status, 0, sizeof(info->status));
1017 info->flags |= IEEE80211_TX_STAT_ACK;
1018 info->flags |= IEEE80211_TX_STAT_AMPDU;
1019 info->status.ampdu_ack_len = ba_resp->txed_2_done;
1020 info->status.ampdu_len = ba_resp->txed;
1021 iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1022 info);
1023 }
1024
1025 info = IEEE80211_SKB_CB(skb);
1026 kmem_cache_free(priv->tx_cmd_pool, (info->driver_data[1]));
1027
1028 ieee80211_tx_status_irqsafe(priv->hw, skb);
1029 }
1030
1031 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1032 }
Linux kernel - Deliverables
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