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iwlagn: reclaim the packets in 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 /*
46 * mac80211 queues, ACs, hardware queues, FIFOs.
47 *
48 * Cf. http://wireless.kernel.org/en/developers/Documentation/mac80211/queues
49 *
50 * Mac80211 uses the following numbers, which we get as from it
51 * by way of skb_get_queue_mapping(skb):
52 *
53 * VO 0
54 * VI 1
55 * BE 2
56 * BK 3
57 *
58 *
59 * Regular (not A-MPDU) frames are put into hardware queues corresponding
60 * to the FIFOs, see comments in iwl-prph.h. Aggregated frames get their
61 * own queue per aggregation session (RA/TID combination), such queues are
62 * set up to map into FIFOs too, for which we need an AC->FIFO mapping. In
63 * order to map frames to the right queue, we also need an AC->hw queue
64 * mapping. This is implemented here.
65 *
66 * Due to the way hw queues are set up (by the hw specific modules like
67 * iwl-4965.c, iwl-5000.c etc.), the AC->hw queue mapping is the identity
68 * mapping.
69 */
70
71 static const u8 tid_to_ac[] = {
72 IEEE80211_AC_BE,
73 IEEE80211_AC_BK,
74 IEEE80211_AC_BK,
75 IEEE80211_AC_BE,
76 IEEE80211_AC_VI,
77 IEEE80211_AC_VI,
78 IEEE80211_AC_VO,
79 IEEE80211_AC_VO
80 };
81
82 static inline int get_ac_from_tid(u16 tid)
83 {
84 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
85 return tid_to_ac[tid];
86
87 /* no support for TIDs 8-15 yet */
88 return -EINVAL;
89 }
90
91 static inline int get_fifo_from_tid(struct iwl_rxon_context *ctx, u16 tid)
92 {
93 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
94 return ctx->ac_to_fifo[tid_to_ac[tid]];
95
96 /* no support for TIDs 8-15 yet */
97 return -EINVAL;
98 }
99
100 static int iwlagn_txq_agg_enable(struct iwl_priv *priv, int txq_id, int sta_id,
101 int tid)
102 {
103 if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
104 (IWLAGN_FIRST_AMPDU_QUEUE +
105 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
106 IWL_WARN(priv,
107 "queue number out of range: %d, must be %d to %d\n",
108 txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
109 IWLAGN_FIRST_AMPDU_QUEUE +
110 priv->cfg->base_params->num_of_ampdu_queues - 1);
111 return -EINVAL;
112 }
113
114 /* Modify device's station table to Tx this TID */
115 return iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
116 }
117
118 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
119 struct ieee80211_tx_info *info,
120 __le16 fc, __le32 *tx_flags)
121 {
122 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
123 info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
124 info->flags & IEEE80211_TX_CTL_AMPDU)
125 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
126 }
127
128 /*
129 * handle build REPLY_TX command notification.
130 */
131 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
132 struct sk_buff *skb,
133 struct iwl_tx_cmd *tx_cmd,
134 struct ieee80211_tx_info *info,
135 struct ieee80211_hdr *hdr, u8 sta_id)
136 {
137 __le16 fc = hdr->frame_control;
138 __le32 tx_flags = tx_cmd->tx_flags;
139
140 tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
141
142 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
143 tx_flags |= TX_CMD_FLG_ACK_MSK;
144 else
145 tx_flags &= ~TX_CMD_FLG_ACK_MSK;
146
147 if (ieee80211_is_probe_resp(fc))
148 tx_flags |= TX_CMD_FLG_TSF_MSK;
149 else if (ieee80211_is_back_req(fc))
150 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
151 else if (info->band == IEEE80211_BAND_2GHZ &&
152 priv->cfg->bt_params &&
153 priv->cfg->bt_params->advanced_bt_coexist &&
154 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
155 ieee80211_is_reassoc_req(fc) ||
156 skb->protocol == cpu_to_be16(ETH_P_PAE)))
157 tx_flags |= TX_CMD_FLG_IGNORE_BT;
158
159
160 tx_cmd->sta_id = sta_id;
161 if (ieee80211_has_morefrags(fc))
162 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
163
164 if (ieee80211_is_data_qos(fc)) {
165 u8 *qc = ieee80211_get_qos_ctl(hdr);
166 tx_cmd->tid_tspec = qc[0] & 0xf;
167 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
168 } else {
169 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
170 }
171
172 iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
173
174 tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
175 if (ieee80211_is_mgmt(fc)) {
176 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
177 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
178 else
179 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
180 } else {
181 tx_cmd->timeout.pm_frame_timeout = 0;
182 }
183
184 tx_cmd->driver_txop = 0;
185 tx_cmd->tx_flags = tx_flags;
186 tx_cmd->next_frame_len = 0;
187 }
188
189 #define RTS_DFAULT_RETRY_LIMIT 60
190
191 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
192 struct iwl_tx_cmd *tx_cmd,
193 struct ieee80211_tx_info *info,
194 __le16 fc)
195 {
196 u32 rate_flags;
197 int rate_idx;
198 u8 rts_retry_limit;
199 u8 data_retry_limit;
200 u8 rate_plcp;
201
202 /* Set retry limit on DATA packets and Probe Responses*/
203 if (ieee80211_is_probe_resp(fc))
204 data_retry_limit = 3;
205 else
206 data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
207 tx_cmd->data_retry_limit = data_retry_limit;
208
209 /* Set retry limit on RTS packets */
210 rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
211 if (data_retry_limit < rts_retry_limit)
212 rts_retry_limit = data_retry_limit;
213 tx_cmd->rts_retry_limit = rts_retry_limit;
214
215 /* DATA packets will use the uCode station table for rate/antenna
216 * selection */
217 if (ieee80211_is_data(fc)) {
218 tx_cmd->initial_rate_index = 0;
219 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
220 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
221 if (priv->tm_fixed_rate) {
222 /*
223 * rate overwrite by testmode
224 * we not only send lq command to change rate
225 * we also re-enforce per data pkt base.
226 */
227 tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
228 memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
229 sizeof(tx_cmd->rate_n_flags));
230 }
231 #endif
232 return;
233 }
234
235 /**
236 * If the current TX rate stored in mac80211 has the MCS bit set, it's
237 * not really a TX rate. Thus, we use the lowest supported rate for
238 * this band. Also use the lowest supported rate if the stored rate
239 * index is invalid.
240 */
241 rate_idx = info->control.rates[0].idx;
242 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
243 (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
244 rate_idx = rate_lowest_index(&priv->bands[info->band],
245 info->control.sta);
246 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
247 if (info->band == IEEE80211_BAND_5GHZ)
248 rate_idx += IWL_FIRST_OFDM_RATE;
249 /* Get PLCP rate for tx_cmd->rate_n_flags */
250 rate_plcp = iwl_rates[rate_idx].plcp;
251 /* Zero out flags for this packet */
252 rate_flags = 0;
253
254 /* Set CCK flag as needed */
255 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
256 rate_flags |= RATE_MCS_CCK_MSK;
257
258 /* Set up antennas */
259 if (priv->cfg->bt_params &&
260 priv->cfg->bt_params->advanced_bt_coexist &&
261 priv->bt_full_concurrent) {
262 /* operated as 1x1 in full concurrency mode */
263 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
264 first_antenna(hw_params(priv).valid_tx_ant));
265 } else
266 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
267 hw_params(priv).valid_tx_ant);
268 rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
269
270 /* Set the rate in the TX cmd */
271 tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
272 }
273
274 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
275 struct ieee80211_tx_info *info,
276 struct iwl_tx_cmd *tx_cmd,
277 struct sk_buff *skb_frag,
278 int sta_id)
279 {
280 struct ieee80211_key_conf *keyconf = info->control.hw_key;
281
282 switch (keyconf->cipher) {
283 case WLAN_CIPHER_SUITE_CCMP:
284 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
285 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
286 if (info->flags & IEEE80211_TX_CTL_AMPDU)
287 tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
288 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
289 break;
290
291 case WLAN_CIPHER_SUITE_TKIP:
292 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
293 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
294 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
295 break;
296
297 case WLAN_CIPHER_SUITE_WEP104:
298 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
299 /* fall through */
300 case WLAN_CIPHER_SUITE_WEP40:
301 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
302 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
303
304 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
305
306 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
307 "with key %d\n", keyconf->keyidx);
308 break;
309
310 default:
311 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
312 break;
313 }
314 }
315
316 /*
317 * start REPLY_TX command process
318 */
319 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
320 {
321 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
322 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
323 struct iwl_station_priv *sta_priv = NULL;
324 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
325 struct iwl_tx_cmd *tx_cmd;
326 int txq_id;
327
328 u16 seq_number = 0;
329 __le16 fc;
330 u8 hdr_len;
331 u16 len;
332 u8 sta_id;
333 u8 tid = 0;
334 unsigned long flags;
335 bool is_agg = false;
336
337 if (info->control.vif)
338 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
339
340 spin_lock_irqsave(&priv->shrd->lock, flags);
341 if (iwl_is_rfkill(priv)) {
342 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
343 goto drop_unlock_priv;
344 }
345
346 fc = hdr->frame_control;
347
348 #ifdef CONFIG_IWLWIFI_DEBUG
349 if (ieee80211_is_auth(fc))
350 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
351 else if (ieee80211_is_assoc_req(fc))
352 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
353 else if (ieee80211_is_reassoc_req(fc))
354 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
355 #endif
356
357 hdr_len = ieee80211_hdrlen(fc);
358
359 /* For management frames use broadcast id to do not break aggregation */
360 if (!ieee80211_is_data(fc))
361 sta_id = ctx->bcast_sta_id;
362 else {
363 /* Find index into station table for destination station */
364 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
365 if (sta_id == IWL_INVALID_STATION) {
366 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
367 hdr->addr1);
368 goto drop_unlock_priv;
369 }
370 }
371
372 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
373
374 if (info->control.sta)
375 sta_priv = (void *)info->control.sta->drv_priv;
376
377 if (sta_priv && sta_priv->asleep &&
378 (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
379 /*
380 * This sends an asynchronous command to the device,
381 * but we can rely on it being processed before the
382 * next frame is processed -- and the next frame to
383 * this station is the one that will consume this
384 * counter.
385 * For now set the counter to just 1 since we do not
386 * support uAPSD yet.
387 */
388 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
389 }
390
391 /*
392 * Send this frame after DTIM -- there's a special queue
393 * reserved for this for contexts that support AP mode.
394 */
395 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
396 txq_id = ctx->mcast_queue;
397 /*
398 * The microcode will clear the more data
399 * bit in the last frame it transmits.
400 */
401 hdr->frame_control |=
402 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
403 } else if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
404 txq_id = IWL_AUX_QUEUE;
405 else
406 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
407
408 /* irqs already disabled/saved above when locking priv->shrd->lock */
409 spin_lock(&priv->shrd->sta_lock);
410
411 if (ieee80211_is_data_qos(fc)) {
412 u8 *qc = NULL;
413 qc = ieee80211_get_qos_ctl(hdr);
414 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
415
416 if (WARN_ON_ONCE(tid >= MAX_TID_COUNT))
417 goto drop_unlock_sta;
418
419 seq_number = priv->stations[sta_id].tid[tid].seq_number;
420 seq_number &= IEEE80211_SCTL_SEQ;
421 hdr->seq_ctrl = hdr->seq_ctrl &
422 cpu_to_le16(IEEE80211_SCTL_FRAG);
423 hdr->seq_ctrl |= cpu_to_le16(seq_number);
424 seq_number += 0x10;
425 /* aggregation is on for this <sta,tid> */
426 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
427 priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) {
428 txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
429 is_agg = true;
430 }
431 }
432
433 tx_cmd = iwl_trans_get_tx_cmd(trans(priv), txq_id);
434 if (unlikely(!tx_cmd))
435 goto drop_unlock_sta;
436
437 /* Copy MAC header from skb into command buffer */
438 memcpy(tx_cmd->hdr, hdr, hdr_len);
439
440 /* Total # bytes to be transmitted */
441 len = (u16)skb->len;
442 tx_cmd->len = cpu_to_le16(len);
443
444 if (info->control.hw_key)
445 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
446
447 /* TODO need this for burst mode later on */
448 iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
449 iwl_dbg_log_tx_data_frame(priv, len, hdr);
450
451 iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
452
453 iwl_update_stats(priv, true, fc, len);
454
455 if (iwl_trans_tx(trans(priv), skb, tx_cmd, txq_id, fc, is_agg, ctx))
456 goto drop_unlock_sta;
457
458 if (ieee80211_is_data_qos(fc)) {
459 priv->stations[sta_id].tid[tid].tfds_in_queue++;
460 if (!ieee80211_has_morefrags(fc))
461 priv->stations[sta_id].tid[tid].seq_number = seq_number;
462 }
463
464 spin_unlock(&priv->shrd->sta_lock);
465 spin_unlock_irqrestore(&priv->shrd->lock, flags);
466
467 /*
468 * Avoid atomic ops if it isn't an associated client.
469 * Also, if this is a packet for aggregation, don't
470 * increase the counter because the ucode will stop
471 * aggregation queues when their respective station
472 * goes to sleep.
473 */
474 if (sta_priv && sta_priv->client && !is_agg)
475 atomic_inc(&sta_priv->pending_frames);
476
477 return 0;
478
479 drop_unlock_sta:
480 spin_unlock(&priv->shrd->sta_lock);
481 drop_unlock_priv:
482 spin_unlock_irqrestore(&priv->shrd->lock, flags);
483 return -1;
484 }
485
486 /*
487 * Find first available (lowest unused) Tx Queue, mark it "active".
488 * Called only when finding queue for aggregation.
489 * Should never return anything < 7, because they should already
490 * be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
491 */
492 static int iwlagn_txq_ctx_activate_free(struct iwl_priv *priv)
493 {
494 int txq_id;
495
496 for (txq_id = 0; txq_id < hw_params(priv).max_txq_num; txq_id++)
497 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
498 return txq_id;
499 return -1;
500 }
501
502 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
503 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
504 {
505 int sta_id;
506 int tx_fifo;
507 int txq_id;
508 int ret;
509 unsigned long flags;
510 struct iwl_tid_data *tid_data;
511
512 tx_fifo = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
513 if (unlikely(tx_fifo < 0))
514 return tx_fifo;
515
516 IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
517 sta->addr, tid);
518
519 sta_id = iwl_sta_id(sta);
520 if (sta_id == IWL_INVALID_STATION) {
521 IWL_ERR(priv, "Start AGG on invalid station\n");
522 return -ENXIO;
523 }
524 if (unlikely(tid >= MAX_TID_COUNT))
525 return -EINVAL;
526
527 if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
528 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
529 return -ENXIO;
530 }
531
532 txq_id = iwlagn_txq_ctx_activate_free(priv);
533 if (txq_id == -1) {
534 IWL_ERR(priv, "No free aggregation queue available\n");
535 return -ENXIO;
536 }
537
538 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
539 tid_data = &priv->stations[sta_id].tid[tid];
540 *ssn = SEQ_TO_SN(tid_data->seq_number);
541 tid_data->agg.txq_id = txq_id;
542 tid_data->agg.tx_fifo = tx_fifo;
543 iwl_set_swq_id(&priv->txq[txq_id], get_ac_from_tid(tid), txq_id);
544 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
545
546 ret = iwlagn_txq_agg_enable(priv, txq_id, sta_id, tid);
547 if (ret)
548 return ret;
549
550 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
551 tid_data = &priv->stations[sta_id].tid[tid];
552 if (tid_data->tfds_in_queue == 0) {
553 IWL_DEBUG_HT(priv, "HW queue is empty\n");
554 tid_data->agg.state = IWL_AGG_ON;
555 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
556 } else {
557 IWL_DEBUG_HT(priv, "HW queue is NOT empty: %d packets in HW queue\n",
558 tid_data->tfds_in_queue);
559 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
560 }
561 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
562 return ret;
563 }
564
565 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
566 struct ieee80211_sta *sta, u16 tid)
567 {
568 int tx_fifo_id, txq_id, sta_id, ssn;
569 struct iwl_tid_data *tid_data;
570 int write_ptr, read_ptr;
571 unsigned long flags;
572
573 tx_fifo_id = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
574 if (unlikely(tx_fifo_id < 0))
575 return tx_fifo_id;
576
577 sta_id = iwl_sta_id(sta);
578
579 if (sta_id == IWL_INVALID_STATION) {
580 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
581 return -ENXIO;
582 }
583
584 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
585
586 tid_data = &priv->stations[sta_id].tid[tid];
587 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
588 txq_id = tid_data->agg.txq_id;
589
590 switch (priv->stations[sta_id].tid[tid].agg.state) {
591 case IWL_EMPTYING_HW_QUEUE_ADDBA:
592 /*
593 * This can happen if the peer stops aggregation
594 * again before we've had a chance to drain the
595 * queue we selected previously, i.e. before the
596 * session was really started completely.
597 */
598 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
599 goto turn_off;
600 case IWL_AGG_ON:
601 break;
602 default:
603 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
604 }
605
606 write_ptr = priv->txq[txq_id].q.write_ptr;
607 read_ptr = priv->txq[txq_id].q.read_ptr;
608
609 /* The queue is not empty */
610 if (write_ptr != read_ptr) {
611 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
612 priv->stations[sta_id].tid[tid].agg.state =
613 IWL_EMPTYING_HW_QUEUE_DELBA;
614 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
615 return 0;
616 }
617
618 IWL_DEBUG_HT(priv, "HW queue is empty\n");
619 turn_off:
620 priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
621
622 /* do not restore/save irqs */
623 spin_unlock(&priv->shrd->sta_lock);
624 spin_lock(&priv->shrd->lock);
625
626 /*
627 * the only reason this call can fail is queue number out of range,
628 * which can happen if uCode is reloaded and all the station
629 * information are lost. if it is outside the range, there is no need
630 * to deactivate the uCode queue, just return "success" to allow
631 * mac80211 to clean up it own data.
632 */
633 iwl_trans_txq_agg_disable(trans(priv), txq_id, ssn, tx_fifo_id);
634 spin_unlock_irqrestore(&priv->shrd->lock, flags);
635
636 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
637
638 return 0;
639 }
640
641 int iwlagn_txq_check_empty(struct iwl_priv *priv,
642 int sta_id, u8 tid, int txq_id)
643 {
644 struct iwl_queue *q = &priv->txq[txq_id].q;
645 u8 *addr = priv->stations[sta_id].sta.sta.addr;
646 struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
647 struct iwl_rxon_context *ctx;
648
649 ctx = &priv->contexts[priv->stations[sta_id].ctxid];
650
651 lockdep_assert_held(&priv->shrd->sta_lock);
652
653 switch (priv->stations[sta_id].tid[tid].agg.state) {
654 case IWL_EMPTYING_HW_QUEUE_DELBA:
655 /* We are reclaiming the last packet of the */
656 /* aggregated HW queue */
657 if ((txq_id == tid_data->agg.txq_id) &&
658 (q->read_ptr == q->write_ptr)) {
659 u16 ssn = SEQ_TO_SN(tid_data->seq_number);
660 int tx_fifo = get_fifo_from_tid(ctx, tid);
661 IWL_DEBUG_HT(priv, "HW queue empty: continue DELBA flow\n");
662 iwl_trans_txq_agg_disable(trans(priv), txq_id,
663 ssn, tx_fifo);
664 tid_data->agg.state = IWL_AGG_OFF;
665 ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
666 }
667 break;
668 case IWL_EMPTYING_HW_QUEUE_ADDBA:
669 /* We are reclaiming the last packet of the queue */
670 if (tid_data->tfds_in_queue == 0) {
671 IWL_DEBUG_HT(priv, "HW queue empty: continue ADDBA flow\n");
672 tid_data->agg.state = IWL_AGG_ON;
673 ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
674 }
675 break;
676 }
677
678 return 0;
679 }
680
681 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
682 struct iwl_rxon_context *ctx,
683 const u8 *addr1)
684 {
685 struct ieee80211_sta *sta;
686 struct iwl_station_priv *sta_priv;
687
688 rcu_read_lock();
689 sta = ieee80211_find_sta(ctx->vif, addr1);
690 if (sta) {
691 sta_priv = (void *)sta->drv_priv;
692 /* avoid atomic ops if this isn't a client */
693 if (sta_priv->client &&
694 atomic_dec_return(&sta_priv->pending_frames) == 0)
695 ieee80211_sta_block_awake(priv->hw, sta, false);
696 }
697 rcu_read_unlock();
698 }
699
700 /**
701 * translate ucode response to mac80211 tx status control values
702 */
703 void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
704 struct ieee80211_tx_info *info)
705 {
706 struct ieee80211_tx_rate *r = &info->control.rates[0];
707
708 info->antenna_sel_tx =
709 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
710 if (rate_n_flags & RATE_MCS_HT_MSK)
711 r->flags |= IEEE80211_TX_RC_MCS;
712 if (rate_n_flags & RATE_MCS_GF_MSK)
713 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
714 if (rate_n_flags & RATE_MCS_HT40_MSK)
715 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
716 if (rate_n_flags & RATE_MCS_DUP_MSK)
717 r->flags |= IEEE80211_TX_RC_DUP_DATA;
718 if (rate_n_flags & RATE_MCS_SGI_MSK)
719 r->flags |= IEEE80211_TX_RC_SHORT_GI;
720 r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
721 }
722
723 #ifdef CONFIG_IWLWIFI_DEBUG
724 const char *iwl_get_tx_fail_reason(u32 status)
725 {
726 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
727 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
728
729 switch (status & TX_STATUS_MSK) {
730 case TX_STATUS_SUCCESS:
731 return "SUCCESS";
732 TX_STATUS_POSTPONE(DELAY);
733 TX_STATUS_POSTPONE(FEW_BYTES);
734 TX_STATUS_POSTPONE(BT_PRIO);
735 TX_STATUS_POSTPONE(QUIET_PERIOD);
736 TX_STATUS_POSTPONE(CALC_TTAK);
737 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
738 TX_STATUS_FAIL(SHORT_LIMIT);
739 TX_STATUS_FAIL(LONG_LIMIT);
740 TX_STATUS_FAIL(FIFO_UNDERRUN);
741 TX_STATUS_FAIL(DRAIN_FLOW);
742 TX_STATUS_FAIL(RFKILL_FLUSH);
743 TX_STATUS_FAIL(LIFE_EXPIRE);
744 TX_STATUS_FAIL(DEST_PS);
745 TX_STATUS_FAIL(HOST_ABORTED);
746 TX_STATUS_FAIL(BT_RETRY);
747 TX_STATUS_FAIL(STA_INVALID);
748 TX_STATUS_FAIL(FRAG_DROPPED);
749 TX_STATUS_FAIL(TID_DISABLE);
750 TX_STATUS_FAIL(FIFO_FLUSHED);
751 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
752 TX_STATUS_FAIL(PASSIVE_NO_RX);
753 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
754 }
755
756 return "UNKNOWN";
757
758 #undef TX_STATUS_FAIL
759 #undef TX_STATUS_POSTPONE
760 }
761 #endif /* CONFIG_IWLWIFI_DEBUG */
762
763 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
764 struct iwlagn_tx_resp *tx_resp)
765 {
766 struct agg_tx_status *frame_status = &tx_resp->status;
767 int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
768 IWLAGN_TX_RES_TID_POS;
769 int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
770 IWLAGN_TX_RES_RA_POS;
771 struct iwl_ht_agg *agg = &priv->stations[sta_id].tid[tid].agg;
772 u32 status = le16_to_cpu(tx_resp->status.status);
773 int i;
774
775 if (agg->wait_for_ba)
776 IWL_DEBUG_TX_REPLY(priv,
777 "got tx response w/o block-ack\n");
778
779 agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
780 agg->wait_for_ba = (tx_resp->frame_count > 1);
781
782 /*
783 * If the BT kill count is non-zero, we'll get this
784 * notification again.
785 */
786 if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
787 priv->cfg->bt_params &&
788 priv->cfg->bt_params->advanced_bt_coexist) {
789 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
790 }
791
792 /* Construct bit-map of pending frames within Tx window */
793 for (i = 0; i < tx_resp->frame_count; i++) {
794 u16 fstatus = le16_to_cpu(frame_status[i].status);
795
796 if (status & AGG_TX_STATUS_MSK)
797 iwlagn_count_agg_tx_err_status(priv, fstatus);
798
799 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
800 AGG_TX_STATE_ABORT_MSK))
801 continue;
802
803 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
804 "try-count (0x%08x)\n",
805 iwl_get_agg_tx_fail_reason(fstatus),
806 fstatus & AGG_TX_STATUS_MSK,
807 fstatus & AGG_TX_TRY_MSK);
808 }
809 }
810
811 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
812 {
813 return le32_to_cpup((__le32 *)&tx_resp->status +
814 tx_resp->frame_count) & MAX_SN;
815 }
816
817 void iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
818 {
819 struct iwl_rx_packet *pkt = rxb_addr(rxb);
820 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
821 int txq_id = SEQ_TO_QUEUE(sequence);
822 int cmd_index = SEQ_TO_INDEX(sequence);
823 struct iwl_tx_queue *txq = &priv->txq[txq_id];
824 struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
825 struct ieee80211_hdr *hdr;
826 u32 status = le16_to_cpu(tx_resp->status.status);
827 u32 ssn = iwlagn_get_scd_ssn(tx_resp);
828 int tid;
829 int sta_id;
830 int freed;
831 struct ieee80211_tx_info *info;
832 unsigned long flags;
833 struct sk_buff_head skbs;
834 struct sk_buff *skb;
835 struct iwl_rxon_context *ctx;
836
837 if ((cmd_index >= txq->q.n_bd) ||
838 (iwl_queue_used(&txq->q, cmd_index) == 0)) {
839 IWL_ERR(priv, "%s: Read index for DMA queue txq_id (%d) "
840 "cmd_index %d is out of range [0-%d] %d %d\n",
841 __func__, txq_id, cmd_index, txq->q.n_bd,
842 txq->q.write_ptr, txq->q.read_ptr);
843 return;
844 }
845
846 txq->time_stamp = jiffies;
847
848 tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
849 IWLAGN_TX_RES_TID_POS;
850 sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
851 IWLAGN_TX_RES_RA_POS;
852
853 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
854
855 if (txq->sched_retry)
856 iwl_rx_reply_tx_agg(priv, tx_resp);
857
858 if (tx_resp->frame_count == 1) {
859 bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
860
861 __skb_queue_head_init(&skbs);
862 /*we can free until ssn % q.n_bd not inclusive */
863 iwl_trans_reclaim(trans(priv), txq_id, ssn, status, &skbs);
864 freed = 0;
865 while (!skb_queue_empty(&skbs)) {
866 skb = __skb_dequeue(&skbs);
867 hdr = (struct ieee80211_hdr *)skb->data;
868
869 if (!ieee80211_is_data_qos(hdr->frame_control))
870 priv->last_seq_ctl = tx_resp->seq_ctl;
871
872 info = IEEE80211_SKB_CB(skb);
873 ctx = info->driver_data[0];
874
875 memset(&info->status, 0, sizeof(info->status));
876
877 if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
878 iwl_is_associated_ctx(ctx) && ctx->vif &&
879 ctx->vif->type == NL80211_IFTYPE_STATION) {
880 ctx->last_tx_rejected = true;
881 iwl_stop_queue(priv, &priv->txq[txq_id]);
882
883 IWL_DEBUG_TX_REPLY(priv,
884 "TXQ %d status %s (0x%08x) "
885 "rate_n_flags 0x%x retries %d\n",
886 txq_id,
887 iwl_get_tx_fail_reason(status),
888 status,
889 le32_to_cpu(tx_resp->rate_n_flags),
890 tx_resp->failure_frame);
891
892 IWL_DEBUG_TX_REPLY(priv,
893 "FrameCnt = %d, idx=%d\n",
894 tx_resp->frame_count, cmd_index);
895 }
896
897 /* check if BAR is needed */
898 if (is_agg && !iwl_is_tx_success(status))
899 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
900 iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
901 tx_resp, is_agg);
902 if (!is_agg)
903 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
904
905 ieee80211_tx_status_irqsafe(priv->hw, skb);
906
907 freed++;
908 }
909
910 WARN_ON(!is_agg && freed != 1);
911
912 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
913 iwlagn_txq_check_empty(priv, sta_id, tid, txq_id);
914 }
915
916 iwl_check_abort_status(priv, tx_resp->frame_count, status);
917 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
918 }
919
920 /**
921 * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
922 *
923 * Handles block-acknowledge notification from device, which reports success
924 * of frames sent via aggregation.
925 */
926 void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
927 struct iwl_rx_mem_buffer *rxb)
928 {
929 struct iwl_rx_packet *pkt = rxb_addr(rxb);
930 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
931 struct iwl_tx_queue *txq = NULL;
932 struct iwl_ht_agg *agg;
933 struct sk_buff_head reclaimed_skbs;
934 struct ieee80211_tx_info *info;
935 struct ieee80211_hdr *hdr;
936 struct sk_buff *skb;
937 unsigned long flags;
938 int index;
939 int sta_id;
940 int tid;
941 int freed;
942
943 /* "flow" corresponds to Tx queue */
944 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
945
946 /* "ssn" is start of block-ack Tx window, corresponds to index
947 * (in Tx queue's circular buffer) of first TFD/frame in window */
948 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
949
950 if (scd_flow >= hw_params(priv).max_txq_num) {
951 IWL_ERR(priv,
952 "BUG_ON scd_flow is bigger than number of queues\n");
953 return;
954 }
955
956 txq = &priv->txq[scd_flow];
957 sta_id = ba_resp->sta_id;
958 tid = ba_resp->tid;
959 agg = &priv->stations[sta_id].tid[tid].agg;
960
961 /* Find index of block-ack window */
962 index = ba_resp_scd_ssn & (txq->q.n_bd - 1);
963
964 spin_lock_irqsave(&priv->shrd->sta_lock, flags);
965
966 if (unlikely(agg->txq_id != scd_flow)) {
967 /*
968 * FIXME: this is a uCode bug which need to be addressed,
969 * log the information and return for now!
970 * since it is possible happen very often and in order
971 * not to fill the syslog, don't enable the logging by default
972 */
973 IWL_DEBUG_TX_REPLY(priv,
974 "BA scd_flow %d does not match txq_id %d\n",
975 scd_flow, agg->txq_id);
976 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
977 return;
978 }
979
980 if (unlikely(!agg->wait_for_ba)) {
981 if (unlikely(ba_resp->bitmap))
982 IWL_ERR(priv, "Received BA when not expected\n");
983 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
984 return;
985 }
986
987 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
988 "sta_id = %d\n",
989 agg->wait_for_ba,
990 (u8 *) &ba_resp->sta_addr_lo32,
991 ba_resp->sta_id);
992 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
993 "scd_flow = %d, scd_ssn = %d\n",
994 ba_resp->tid,
995 ba_resp->seq_ctl,
996 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
997 ba_resp->scd_flow,
998 ba_resp->scd_ssn);
999
1000 /* Mark that the expected block-ack response arrived */
1001 agg->wait_for_ba = 0;
1002
1003 /* Sanity check values reported by uCode */
1004 if (ba_resp->txed_2_done > ba_resp->txed) {
1005 IWL_DEBUG_TX_REPLY(priv,
1006 "bogus sent(%d) and ack(%d) count\n",
1007 ba_resp->txed, ba_resp->txed_2_done);
1008 /*
1009 * set txed_2_done = txed,
1010 * so it won't impact rate scale
1011 */
1012 ba_resp->txed = ba_resp->txed_2_done;
1013 }
1014 IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
1015 ba_resp->txed, ba_resp->txed_2_done);
1016
1017 __skb_queue_head_init(&reclaimed_skbs);
1018
1019 /* Release all TFDs before the SSN, i.e. all TFDs in front of
1020 * block-ack window (we assume that they've been successfully
1021 * transmitted ... if not, it's too late anyway). */
1022 iwl_trans_reclaim(trans(priv), scd_flow, ba_resp_scd_ssn, 0,
1023 &reclaimed_skbs);
1024 freed = 0;
1025 while (!skb_queue_empty(&reclaimed_skbs)) {
1026
1027 skb = __skb_dequeue(&reclaimed_skbs);
1028 hdr = (struct ieee80211_hdr *)skb->data;
1029
1030 if (ieee80211_is_data_qos(hdr->frame_control))
1031 freed++;
1032 else
1033 WARN_ON_ONCE(1);
1034
1035 if (freed == 0) {
1036 /* this is the first skb we deliver in this batch */
1037 /* put the rate scaling data there */
1038 info = IEEE80211_SKB_CB(skb);
1039 memset(&info->status, 0, sizeof(info->status));
1040 info->flags |= IEEE80211_TX_STAT_ACK;
1041 info->flags |= IEEE80211_TX_STAT_AMPDU;
1042 info->status.ampdu_ack_len = ba_resp->txed_2_done;
1043 info->status.ampdu_len = ba_resp->txed;
1044 iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1045 info);
1046 }
1047
1048 ieee80211_tx_status_irqsafe(priv->hw, skb);
1049 }
1050
1051 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
1052 iwlagn_txq_check_empty(priv, sta_id, tid, scd_flow);
1053
1054 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1055 }
Linux kernel - Deliverables
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