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Merge branch 'akpm'
[linux-2.6/next.git] / drivers / net / wireless / iwlwifi / iwl-agn-tx.c
blob9bc26da62768cc97a0cdf3fa217fbb78561ae8c7
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
35 #include "iwl-dev.h"
36 #include "iwl-core.h"
37 #include "iwl-sta.h"
38 #include "iwl-io.h"
39 #include "iwl-helpers.h"
40 #include "iwl-agn-hw.h"
41 #include "iwl-agn.h"
42 #include "iwl-trans.h"
43
44 /*
45 * mac80211 queues, ACs, hardware queues, FIFOs.
46 *
47 * Cf. http://wireless.kernel.org/en/developers/Documentation/mac80211/queues
48 *
49 * Mac80211 uses the following numbers, which we get as from it
50 * by way of skb_get_queue_mapping(skb):
51 *
52 * VO 0
53 * VI 1
54 * BE 2
55 * BK 3
56 *
57 *
58 * Regular (not A-MPDU) frames are put into hardware queues corresponding
59 * to the FIFOs, see comments in iwl-prph.h. Aggregated frames get their
60 * own queue per aggregation session (RA/TID combination), such queues are
61 * set up to map into FIFOs too, for which we need an AC->FIFO mapping. In
62 * order to map frames to the right queue, we also need an AC->hw queue
63 * mapping. This is implemented here.
64 *
65 * Due to the way hw queues are set up (by the hw specific modules like
66 * iwl-4965.c, iwl-5000.c etc.), the AC->hw queue mapping is the identity
67 * mapping.
68 */
69
70 static const u8 tid_to_ac[] = {
71 IEEE80211_AC_BE,
72 IEEE80211_AC_BK,
73 IEEE80211_AC_BK,
74 IEEE80211_AC_BE,
75 IEEE80211_AC_VI,
76 IEEE80211_AC_VI,
77 IEEE80211_AC_VO,
78 IEEE80211_AC_VO
79 };
80
81 static inline int get_ac_from_tid(u16 tid)
82 {
83 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
84 return tid_to_ac[tid];
85
86 /* no support for TIDs 8-15 yet */
87 return -EINVAL;
88 }
89
90 static inline int get_fifo_from_tid(struct iwl_rxon_context *ctx, u16 tid)
91 {
92 if (likely(tid < ARRAY_SIZE(tid_to_ac)))
93 return ctx->ac_to_fifo[tid_to_ac[tid]];
94
95 /* no support for TIDs 8-15 yet */
96 return -EINVAL;
97 }
98
99 static int iwlagn_txq_agg_enable(struct iwl_priv *priv, int txq_id, int sta_id,
100 int tid)
101 {
102 if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
103 (IWLAGN_FIRST_AMPDU_QUEUE +
104 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
105 IWL_WARN(priv,
106 "queue number out of range: %d, must be %d to %d\n",
107 txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
108 IWLAGN_FIRST_AMPDU_QUEUE +
109 priv->cfg->base_params->num_of_ampdu_queues - 1);
110 return -EINVAL;
111 }
112
113 /* Modify device's station table to Tx this TID */
114 return iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
115 }
116
117 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
118 struct ieee80211_tx_info *info,
119 __le16 fc, __le32 *tx_flags)
120 {
121 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
122 info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
123 info->flags & IEEE80211_TX_CTL_AMPDU)
124 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
125 }
126
127 /*
128 * handle build REPLY_TX command notification.
129 */
130 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
131 struct sk_buff *skb,
132 struct iwl_tx_cmd *tx_cmd,
133 struct ieee80211_tx_info *info,
134 struct ieee80211_hdr *hdr, u8 sta_id)
135 {
136 __le16 fc = hdr->frame_control;
137 __le32 tx_flags = tx_cmd->tx_flags;
138
139 tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
140
141 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
142 tx_flags |= TX_CMD_FLG_ACK_MSK;
143 else
144 tx_flags &= ~TX_CMD_FLG_ACK_MSK;
145
146 if (ieee80211_is_probe_resp(fc))
147 tx_flags |= TX_CMD_FLG_TSF_MSK;
148 else if (ieee80211_is_back_req(fc))
149 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
150 else if (info->band == IEEE80211_BAND_2GHZ &&
151 priv->cfg->bt_params &&
152 priv->cfg->bt_params->advanced_bt_coexist &&
153 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
154 ieee80211_is_reassoc_req(fc) ||
155 skb->protocol == cpu_to_be16(ETH_P_PAE)))
156 tx_flags |= TX_CMD_FLG_IGNORE_BT;
157
158
159 tx_cmd->sta_id = sta_id;
160 if (ieee80211_has_morefrags(fc))
161 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
162
163 if (ieee80211_is_data_qos(fc)) {
164 u8 *qc = ieee80211_get_qos_ctl(hdr);
165 tx_cmd->tid_tspec = qc[0] & 0xf;
166 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
167 } else {
168 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
169 }
170
171 iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
172
173 tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
174 if (ieee80211_is_mgmt(fc)) {
175 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
176 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
177 else
178 tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
179 } else {
180 tx_cmd->timeout.pm_frame_timeout = 0;
181 }
182
183 tx_cmd->driver_txop = 0;
184 tx_cmd->tx_flags = tx_flags;
185 tx_cmd->next_frame_len = 0;
186 }
187
188 #define RTS_DFAULT_RETRY_LIMIT 60
189
190 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
191 struct iwl_tx_cmd *tx_cmd,
192 struct ieee80211_tx_info *info,
193 __le16 fc)
194 {
195 u32 rate_flags;
196 int rate_idx;
197 u8 rts_retry_limit;
198 u8 data_retry_limit;
199 u8 rate_plcp;
200
201 /* Set retry limit on DATA packets and Probe Responses*/
202 if (ieee80211_is_probe_resp(fc))
203 data_retry_limit = 3;
204 else
205 data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
206 tx_cmd->data_retry_limit = data_retry_limit;
207
208 /* Set retry limit on RTS packets */
209 rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
210 if (data_retry_limit < rts_retry_limit)
211 rts_retry_limit = data_retry_limit;
212 tx_cmd->rts_retry_limit = rts_retry_limit;
213
214 /* DATA packets will use the uCode station table for rate/antenna
215 * selection */
216 if (ieee80211_is_data(fc)) {
217 tx_cmd->initial_rate_index = 0;
218 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
219 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
220 if (priv->tm_fixed_rate) {
221 /*
222 * rate overwrite by testmode
223 * we not only send lq command to change rate
224 * we also re-enforce per data pkt base.
225 */
226 tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
227 memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
228 sizeof(tx_cmd->rate_n_flags));
229 }
230 #endif
231 return;
232 }
233
234 /**
235 * If the current TX rate stored in mac80211 has the MCS bit set, it's
236 * not really a TX rate. Thus, we use the lowest supported rate for
237 * this band. Also use the lowest supported rate if the stored rate
238 * index is invalid.
239 */
240 rate_idx = info->control.rates[0].idx;
241 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
242 (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
243 rate_idx = rate_lowest_index(&priv->bands[info->band],
244 info->control.sta);
245 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
246 if (info->band == IEEE80211_BAND_5GHZ)
247 rate_idx += IWL_FIRST_OFDM_RATE;
248 /* Get PLCP rate for tx_cmd->rate_n_flags */
249 rate_plcp = iwl_rates[rate_idx].plcp;
250 /* Zero out flags for this packet */
251 rate_flags = 0;
252
253 /* Set CCK flag as needed */
254 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
255 rate_flags |= RATE_MCS_CCK_MSK;
256
257 /* Set up antennas */
258 if (priv->cfg->bt_params &&
259 priv->cfg->bt_params->advanced_bt_coexist &&
260 priv->bt_full_concurrent) {
261 /* operated as 1x1 in full concurrency mode */
262 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
263 first_antenna(priv->hw_params.valid_tx_ant));
264 } else
265 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
266 priv->hw_params.valid_tx_ant);
267 rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
268
269 /* Set the rate in the TX cmd */
270 tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
271 }
272
273 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
274 struct ieee80211_tx_info *info,
275 struct iwl_tx_cmd *tx_cmd,
276 struct sk_buff *skb_frag,
277 int sta_id)
278 {
279 struct ieee80211_key_conf *keyconf = info->control.hw_key;
280
281 switch (keyconf->cipher) {
282 case WLAN_CIPHER_SUITE_CCMP:
283 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
284 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
285 if (info->flags & IEEE80211_TX_CTL_AMPDU)
286 tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
287 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
288 break;
289
290 case WLAN_CIPHER_SUITE_TKIP:
291 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
292 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
293 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
294 break;
295
296 case WLAN_CIPHER_SUITE_WEP104:
297 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
298 /* fall through */
299 case WLAN_CIPHER_SUITE_WEP40:
300 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
301 (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
302
303 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
304
305 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
306 "with key %d\n", keyconf->keyidx);
307 break;
308
309 default:
310 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
311 break;
312 }
313 }
314
315 /*
316 * start REPLY_TX command process
317 */
318 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
319 {
320 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
321 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
322 struct iwl_station_priv *sta_priv = NULL;
323 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
324 struct iwl_tx_cmd *tx_cmd;
325 int txq_id;
326
327 u16 seq_number = 0;
328 __le16 fc;
329 u8 hdr_len;
330 u16 len;
331 u8 sta_id;
332 u8 tid = 0;
333 unsigned long flags;
334 bool is_agg = false;
335
336 if (info->control.vif)
337 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
338
339 spin_lock_irqsave(&priv->lock, flags);
340 if (iwl_is_rfkill(priv)) {
341 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
342 goto drop_unlock_priv;
343 }
344
345 fc = hdr->frame_control;
346
347 #ifdef CONFIG_IWLWIFI_DEBUG
348 if (ieee80211_is_auth(fc))
349 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
350 else if (ieee80211_is_assoc_req(fc))
351 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
352 else if (ieee80211_is_reassoc_req(fc))
353 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
354 #endif
355
356 hdr_len = ieee80211_hdrlen(fc);
357
358 /* For management frames use broadcast id to do not break aggregation */
359 if (!ieee80211_is_data(fc))
360 sta_id = ctx->bcast_sta_id;
361 else {
362 /* Find index into station table for destination station */
363 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
364 if (sta_id == IWL_INVALID_STATION) {
365 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
366 hdr->addr1);
367 goto drop_unlock_priv;
368 }
369 }
370
371 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
372
373 if (info->control.sta)
374 sta_priv = (void *)info->control.sta->drv_priv;
375
376 if (sta_priv && sta_priv->asleep &&
377 (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
378 /*
379 * This sends an asynchronous command to the device,
380 * but we can rely on it being processed before the
381 * next frame is processed -- and the next frame to
382 * this station is the one that will consume this
383 * counter.
384 * For now set the counter to just 1 since we do not
385 * support uAPSD yet.
386 */
387 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
388 }
389
390 /*
391 * Send this frame after DTIM -- there's a special queue
392 * reserved for this for contexts that support AP mode.
393 */
394 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
395 txq_id = ctx->mcast_queue;
396 /*
397 * The microcode will clear the more data
398 * bit in the last frame it transmits.
399 */
400 hdr->frame_control |=
401 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
402 } else if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
403 txq_id = IWL_AUX_QUEUE;
404 else
405 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
406
407 /* irqs already disabled/saved above when locking priv->lock */
408 spin_lock(&priv->sta_lock);
409
410 if (ieee80211_is_data_qos(fc)) {
411 u8 *qc = NULL;
412 qc = ieee80211_get_qos_ctl(hdr);
413 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
414
415 if (WARN_ON_ONCE(tid >= MAX_TID_COUNT))
416 goto drop_unlock_sta;
417
418 seq_number = priv->stations[sta_id].tid[tid].seq_number;
419 seq_number &= IEEE80211_SCTL_SEQ;
420 hdr->seq_ctrl = hdr->seq_ctrl &
421 cpu_to_le16(IEEE80211_SCTL_FRAG);
422 hdr->seq_ctrl |= cpu_to_le16(seq_number);
423 seq_number += 0x10;
424 /* aggregation is on for this <sta,tid> */
425 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
426 priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) {
427 txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
428 is_agg = true;
429 }
430 }
431
432 tx_cmd = trans_get_tx_cmd(&priv->trans, txq_id);
433 if (unlikely(!tx_cmd))
434 goto drop_unlock_sta;
435
436 /* Copy MAC header from skb into command buffer */
437 memcpy(tx_cmd->hdr, hdr, hdr_len);
438
439 /* Total # bytes to be transmitted */
440 len = (u16)skb->len;
441 tx_cmd->len = cpu_to_le16(len);
442
443 if (info->control.hw_key)
444 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
445
446 /* TODO need this for burst mode later on */
447 iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
448 iwl_dbg_log_tx_data_frame(priv, len, hdr);
449
450 iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
451
452 iwl_update_stats(priv, true, fc, len);
453
454 if (trans_tx(&priv->trans, skb, tx_cmd, txq_id, fc, is_agg, ctx))
455 goto drop_unlock_sta;
456
457 if (ieee80211_is_data_qos(fc)) {
458 priv->stations[sta_id].tid[tid].tfds_in_queue++;
459 if (!ieee80211_has_morefrags(fc))
460 priv->stations[sta_id].tid[tid].seq_number = seq_number;
461 }
462
463 spin_unlock(&priv->sta_lock);
464 spin_unlock_irqrestore(&priv->lock, flags);
465
466 /*
467 * Avoid atomic ops if it isn't an associated client.
468 * Also, if this is a packet for aggregation, don't
469 * increase the counter because the ucode will stop
470 * aggregation queues when their respective station
471 * goes to sleep.
472 */
473 if (sta_priv && sta_priv->client && !is_agg)
474 atomic_inc(&sta_priv->pending_frames);
475
476 return 0;
477
478 drop_unlock_sta:
479 spin_unlock(&priv->sta_lock);
480 drop_unlock_priv:
481 spin_unlock_irqrestore(&priv->lock, flags);
482 return -1;
483 }
484
485 /*
486 * Find first available (lowest unused) Tx Queue, mark it "active".
487 * Called only when finding queue for aggregation.
488 * Should never return anything < 7, because they should already
489 * be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
490 */
491 static int iwlagn_txq_ctx_activate_free(struct iwl_priv *priv)
492 {
493 int txq_id;
494
495 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
496 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
497 return txq_id;
498 return -1;
499 }
500
501 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
502 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
503 {
504 int sta_id;
505 int tx_fifo;
506 int txq_id;
507 int ret;
508 unsigned long flags;
509 struct iwl_tid_data *tid_data;
510
511 tx_fifo = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
512 if (unlikely(tx_fifo < 0))
513 return tx_fifo;
514
515 IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
516 sta->addr, tid);
517
518 sta_id = iwl_sta_id(sta);
519 if (sta_id == IWL_INVALID_STATION) {
520 IWL_ERR(priv, "Start AGG on invalid station\n");
521 return -ENXIO;
522 }
523 if (unlikely(tid >= MAX_TID_COUNT))
524 return -EINVAL;
525
526 if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
527 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
528 return -ENXIO;
529 }
530
531 txq_id = iwlagn_txq_ctx_activate_free(priv);
532 if (txq_id == -1) {
533 IWL_ERR(priv, "No free aggregation queue available\n");
534 return -ENXIO;
535 }
536
537 spin_lock_irqsave(&priv->sta_lock, flags);
538 tid_data = &priv->stations[sta_id].tid[tid];
539 *ssn = SEQ_TO_SN(tid_data->seq_number);
540 tid_data->agg.txq_id = txq_id;
541 tid_data->agg.tx_fifo = tx_fifo;
542 iwl_set_swq_id(&priv->txq[txq_id], get_ac_from_tid(tid), txq_id);
543 spin_unlock_irqrestore(&priv->sta_lock, flags);
544
545 ret = iwlagn_txq_agg_enable(priv, txq_id, sta_id, tid);
546 if (ret)
547 return ret;
548
549 spin_lock_irqsave(&priv->sta_lock, flags);
550 tid_data = &priv->stations[sta_id].tid[tid];
551 if (tid_data->tfds_in_queue == 0) {
552 IWL_DEBUG_HT(priv, "HW queue is empty\n");
553 tid_data->agg.state = IWL_AGG_ON;
554 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
555 } else {
556 IWL_DEBUG_HT(priv, "HW queue is NOT empty: %d packets in HW queue\n",
557 tid_data->tfds_in_queue);
558 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
559 }
560 spin_unlock_irqrestore(&priv->sta_lock, flags);
561 return ret;
562 }
563
564 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
565 struct ieee80211_sta *sta, u16 tid)
566 {
567 int tx_fifo_id, txq_id, sta_id, ssn;
568 struct iwl_tid_data *tid_data;
569 int write_ptr, read_ptr;
570 unsigned long flags;
571
572 tx_fifo_id = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
573 if (unlikely(tx_fifo_id < 0))
574 return tx_fifo_id;
575
576 sta_id = iwl_sta_id(sta);
577
578 if (sta_id == IWL_INVALID_STATION) {
579 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
580 return -ENXIO;
581 }
582
583 spin_lock_irqsave(&priv->sta_lock, flags);
584
585 tid_data = &priv->stations[sta_id].tid[tid];
586 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
587 txq_id = tid_data->agg.txq_id;
588
589 switch (priv->stations[sta_id].tid[tid].agg.state) {
590 case IWL_EMPTYING_HW_QUEUE_ADDBA:
591 /*
592 * This can happen if the peer stops aggregation
593 * again before we've had a chance to drain the
594 * queue we selected previously, i.e. before the
595 * session was really started completely.
596 */
597 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
598 goto turn_off;
599 case IWL_AGG_ON:
600 break;
601 default:
602 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
603 }
604
605 write_ptr = priv->txq[txq_id].q.write_ptr;
606 read_ptr = priv->txq[txq_id].q.read_ptr;
607
608 /* The queue is not empty */
609 if (write_ptr != read_ptr) {
610 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
611 priv->stations[sta_id].tid[tid].agg.state =
612 IWL_EMPTYING_HW_QUEUE_DELBA;
613 spin_unlock_irqrestore(&priv->sta_lock, flags);
614 return 0;
615 }
616
617 IWL_DEBUG_HT(priv, "HW queue is empty\n");
618 turn_off:
619 priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
620
621 /* do not restore/save irqs */
622 spin_unlock(&priv->sta_lock);
623 spin_lock(&priv->lock);
624
625 /*
626 * the only reason this call can fail is queue number out of range,
627 * which can happen if uCode is reloaded and all the station
628 * information are lost. if it is outside the range, there is no need
629 * to deactivate the uCode queue, just return "success" to allow
630 * mac80211 to clean up it own data.
631 */
632 trans_txq_agg_disable(&priv->trans, txq_id, ssn, tx_fifo_id);
633 spin_unlock_irqrestore(&priv->lock, flags);
634
635 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
636
637 return 0;
638 }
639
640 int iwlagn_txq_check_empty(struct iwl_priv *priv,
641 int sta_id, u8 tid, int txq_id)
642 {
643 struct iwl_queue *q = &priv->txq[txq_id].q;
644 u8 *addr = priv->stations[sta_id].sta.sta.addr;
645 struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
646 struct iwl_rxon_context *ctx;
647
648 ctx = &priv->contexts[priv->stations[sta_id].ctxid];
649
650 lockdep_assert_held(&priv->sta_lock);
651
652 switch (priv->stations[sta_id].tid[tid].agg.state) {
653 case IWL_EMPTYING_HW_QUEUE_DELBA:
654 /* We are reclaiming the last packet of the */
655 /* aggregated HW queue */
656 if ((txq_id == tid_data->agg.txq_id) &&
657 (q->read_ptr == q->write_ptr)) {
658 u16 ssn = SEQ_TO_SN(tid_data->seq_number);
659 int tx_fifo = get_fifo_from_tid(ctx, tid);
660 IWL_DEBUG_HT(priv, "HW queue empty: continue DELBA flow\n");
661 trans_txq_agg_disable(&priv->trans, txq_id,
662 ssn, tx_fifo);
663 tid_data->agg.state = IWL_AGG_OFF;
664 ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
665 }
666 break;
667 case IWL_EMPTYING_HW_QUEUE_ADDBA:
668 /* We are reclaiming the last packet of the queue */
669 if (tid_data->tfds_in_queue == 0) {
670 IWL_DEBUG_HT(priv, "HW queue empty: continue ADDBA flow\n");
671 tid_data->agg.state = IWL_AGG_ON;
672 ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
673 }
674 break;
675 }
676
677 return 0;
678 }
679
680 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
681 struct iwl_rxon_context *ctx,
682 const u8 *addr1)
683 {
684 struct ieee80211_sta *sta;
685 struct iwl_station_priv *sta_priv;
686
687 rcu_read_lock();
688 sta = ieee80211_find_sta(ctx->vif, addr1);
689 if (sta) {
690 sta_priv = (void *)sta->drv_priv;
691 /* avoid atomic ops if this isn't a client */
692 if (sta_priv->client &&
693 atomic_dec_return(&sta_priv->pending_frames) == 0)
694 ieee80211_sta_block_awake(priv->hw, sta, false);
695 }
696 rcu_read_unlock();
697 }
698
699 static void iwlagn_tx_status(struct iwl_priv *priv, struct iwl_tx_info *tx_info,
700 bool is_agg)
701 {
702 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx_info->skb->data;
703
704 if (!is_agg)
705 iwlagn_non_agg_tx_status(priv, tx_info->ctx, hdr->addr1);
706
707 ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb);
708 }
709
710 int iwlagn_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
711 {
712 struct iwl_tx_queue *txq = &priv->txq[txq_id];
713 struct iwl_queue *q = &txq->q;
714 struct iwl_tx_info *tx_info;
715 int nfreed = 0;
716 struct ieee80211_hdr *hdr;
717
718 if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) {
719 IWL_ERR(priv, "%s: Read index for DMA queue txq id (%d), "
720 "index %d is out of range [0-%d] %d %d.\n", __func__,
721 txq_id, index, q->n_bd, q->write_ptr, q->read_ptr);
722 return 0;
723 }
724
725 for (index = iwl_queue_inc_wrap(index, q->n_bd);
726 q->read_ptr != index;
727 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
728
729 tx_info = &txq->txb[txq->q.read_ptr];
730
731 if (WARN_ON_ONCE(tx_info->skb == NULL))
732 continue;
733
734 hdr = (struct ieee80211_hdr *)tx_info->skb->data;
735 if (ieee80211_is_data_qos(hdr->frame_control))
736 nfreed++;
737
738 iwlagn_tx_status(priv, tx_info,
739 txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
740 tx_info->skb = NULL;
741
742 iwlagn_txq_inval_byte_cnt_tbl(priv, txq);
743
744 iwlagn_txq_free_tfd(priv, txq, txq->q.read_ptr);
745 }
746 return nfreed;
747 }
748
749 /**
750 * iwlagn_tx_status_reply_compressed_ba - Update tx status from block-ack
751 *
752 * Go through block-ack's bitmap of ACK'd frames, update driver's record of
753 * ACK vs. not. This gets sent to mac80211, then to rate scaling algo.
754 */
755 static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
756 struct iwl_ht_agg *agg,
757 struct iwl_compressed_ba_resp *ba_resp)
758
759 {
760 int sh;
761 u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
762 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
763 struct ieee80211_tx_info *info;
764 u64 bitmap, sent_bitmap;
765
766 if (unlikely(!agg->wait_for_ba)) {
767 if (unlikely(ba_resp->bitmap))
768 IWL_ERR(priv, "Received BA when not expected\n");
769 return -EINVAL;
770 }
771
772 /* Mark that the expected block-ack response arrived */
773 agg->wait_for_ba = 0;
774 IWL_DEBUG_TX_REPLY(priv, "BA %d %d\n", agg->start_idx, ba_resp->seq_ctl);
775
776 /* Calculate shift to align block-ack bits with our Tx window bits */
777 sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4);
778 if (sh < 0)
779 sh += 0x100;
780
781 /*
782 * Check for success or failure according to the
783 * transmitted bitmap and block-ack bitmap
784 */
785 bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
786 sent_bitmap = bitmap & agg->bitmap;
787
788 /* Sanity check values reported by uCode */
789 if (ba_resp->txed_2_done > ba_resp->txed) {
790 IWL_DEBUG_TX_REPLY(priv,
791 "bogus sent(%d) and ack(%d) count\n",
792 ba_resp->txed, ba_resp->txed_2_done);
793 /*
794 * set txed_2_done = txed,
795 * so it won't impact rate scale
796 */
797 ba_resp->txed = ba_resp->txed_2_done;
798 }
799 IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
800 ba_resp->txed, ba_resp->txed_2_done);
801
802 /* Find the first ACKed frame to store the TX status */
803 while (sent_bitmap && !(sent_bitmap & 1)) {
804 agg->start_idx = (agg->start_idx + 1) & 0xff;
805 sent_bitmap >>= 1;
806 }
807
808 info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].skb);
809 memset(&info->status, 0, sizeof(info->status));
810 info->flags |= IEEE80211_TX_STAT_ACK;
811 info->flags |= IEEE80211_TX_STAT_AMPDU;
812 info->status.ampdu_ack_len = ba_resp->txed_2_done;
813 info->status.ampdu_len = ba_resp->txed;
814 iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags, info);
815
816 return 0;
817 }
818
819 /**
820 * translate ucode response to mac80211 tx status control values
821 */
822 void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
823 struct ieee80211_tx_info *info)
824 {
825 struct ieee80211_tx_rate *r = &info->control.rates[0];
826
827 info->antenna_sel_tx =
828 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
829 if (rate_n_flags & RATE_MCS_HT_MSK)
830 r->flags |= IEEE80211_TX_RC_MCS;
831 if (rate_n_flags & RATE_MCS_GF_MSK)
832 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
833 if (rate_n_flags & RATE_MCS_HT40_MSK)
834 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
835 if (rate_n_flags & RATE_MCS_DUP_MSK)
836 r->flags |= IEEE80211_TX_RC_DUP_DATA;
837 if (rate_n_flags & RATE_MCS_SGI_MSK)
838 r->flags |= IEEE80211_TX_RC_SHORT_GI;
839 r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
840 }
841
842 /**
843 * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
844 *
845 * Handles block-acknowledge notification from device, which reports success
846 * of frames sent via aggregation.
847 */
848 void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
849 struct iwl_rx_mem_buffer *rxb)
850 {
851 struct iwl_rx_packet *pkt = rxb_addr(rxb);
852 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
853 struct iwl_tx_queue *txq = NULL;
854 struct iwl_ht_agg *agg;
855 int index;
856 int sta_id;
857 int tid;
858 unsigned long flags;
859
860 /* "flow" corresponds to Tx queue */
861 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
862
863 /* "ssn" is start of block-ack Tx window, corresponds to index
864 * (in Tx queue's circular buffer) of first TFD/frame in window */
865 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
866
867 if (scd_flow >= priv->hw_params.max_txq_num) {
868 IWL_ERR(priv,
869 "BUG_ON scd_flow is bigger than number of queues\n");
870 return;
871 }
872
873 txq = &priv->txq[scd_flow];
874 sta_id = ba_resp->sta_id;
875 tid = ba_resp->tid;
876 agg = &priv->stations[sta_id].tid[tid].agg;
877 if (unlikely(agg->txq_id != scd_flow)) {
878 /*
879 * FIXME: this is a uCode bug which need to be addressed,
880 * log the information and return for now!
881 * since it is possible happen very often and in order
882 * not to fill the syslog, don't enable the logging by default
883 */
884 IWL_DEBUG_TX_REPLY(priv,
885 "BA scd_flow %d does not match txq_id %d\n",
886 scd_flow, agg->txq_id);
887 return;
888 }
889
890 /* Find index just before block-ack window */
891 index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
892
893 spin_lock_irqsave(&priv->sta_lock, flags);
894
895 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
896 "sta_id = %d\n",
897 agg->wait_for_ba,
898 (u8 *) &ba_resp->sta_addr_lo32,
899 ba_resp->sta_id);
900 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = "
901 "%d, scd_ssn = %d\n",
902 ba_resp->tid,
903 ba_resp->seq_ctl,
904 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
905 ba_resp->scd_flow,
906 ba_resp->scd_ssn);
907 IWL_DEBUG_TX_REPLY(priv, "DAT start_idx = %d, bitmap = 0x%llx\n",
908 agg->start_idx,
909 (unsigned long long)agg->bitmap);
910
911 /* Update driver's record of ACK vs. not for each frame in window */
912 iwlagn_tx_status_reply_compressed_ba(priv, agg, ba_resp);
913
914 /* Release all TFDs before the SSN, i.e. all TFDs in front of
915 * block-ack window (we assume that they've been successfully
916 * transmitted ... if not, it's too late anyway). */
917 if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
918 /* calculate mac80211 ampdu sw queue to wake */
919 int freed = iwlagn_tx_queue_reclaim(priv, scd_flow, index);
920 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
921
922 if ((iwl_queue_space(&txq->q) > txq->q.low_mark) &&
923 priv->mac80211_registered &&
924 (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
925 iwl_wake_queue(priv, txq);
926
927 iwlagn_txq_check_empty(priv, sta_id, tid, scd_flow);
928 }
929
930 spin_unlock_irqrestore(&priv->sta_lock, flags);
931 }
932
933 #ifdef CONFIG_IWLWIFI_DEBUG
934 const char *iwl_get_tx_fail_reason(u32 status)
935 {
936 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
937 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
938
939 switch (status & TX_STATUS_MSK) {
940 case TX_STATUS_SUCCESS:
941 return "SUCCESS";
942 TX_STATUS_POSTPONE(DELAY);
943 TX_STATUS_POSTPONE(FEW_BYTES);
944 TX_STATUS_POSTPONE(BT_PRIO);
945 TX_STATUS_POSTPONE(QUIET_PERIOD);
946 TX_STATUS_POSTPONE(CALC_TTAK);
947 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
948 TX_STATUS_FAIL(SHORT_LIMIT);
949 TX_STATUS_FAIL(LONG_LIMIT);
950 TX_STATUS_FAIL(FIFO_UNDERRUN);
951 TX_STATUS_FAIL(DRAIN_FLOW);
952 TX_STATUS_FAIL(RFKILL_FLUSH);
953 TX_STATUS_FAIL(LIFE_EXPIRE);
954 TX_STATUS_FAIL(DEST_PS);
955 TX_STATUS_FAIL(HOST_ABORTED);
956 TX_STATUS_FAIL(BT_RETRY);
957 TX_STATUS_FAIL(STA_INVALID);
958 TX_STATUS_FAIL(FRAG_DROPPED);
959 TX_STATUS_FAIL(TID_DISABLE);
960 TX_STATUS_FAIL(FIFO_FLUSHED);
961 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
962 TX_STATUS_FAIL(PASSIVE_NO_RX);
963 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
964 }
965
966 return "UNKNOWN";
967
968 #undef TX_STATUS_FAIL
969 #undef TX_STATUS_POSTPONE
970 }
971 #endif /* CONFIG_IWLWIFI_DEBUG */
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