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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
70static 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
81static 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
90static 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
99static 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
117static 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 */
130static 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,
135 u8 std_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 = std_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
191static 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(priv->hw_params.valid_tx_ant));
265 } else
266 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
267 priv->hw_params.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
274static 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 */
319int 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 /*
338 * If the frame needs to go out off-channel, then
339 * we'll have put the PAN context to that channel,
340 * so make the frame go out there.
341 */
342 if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
343 ctx = &priv->contexts[IWL_RXON_CTX_PAN];
344 else if (info->control.vif)
345 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
346
347 spin_lock_irqsave(&priv->lock, flags);
348 if (iwl_is_rfkill(priv)) {
349 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
350 goto drop_unlock_priv;
351 }
352
353 fc = hdr->frame_control;
354
355#ifdef CONFIG_IWLWIFI_DEBUG
356 if (ieee80211_is_auth(fc))
357 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
358 else if (ieee80211_is_assoc_req(fc))
359 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
360 else if (ieee80211_is_reassoc_req(fc))
361 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
362#endif
363
364 hdr_len = ieee80211_hdrlen(fc);
365
366 /* For management frames use broadcast id to do not break aggregation */
367 if (!ieee80211_is_data(fc))
368 sta_id = ctx->bcast_sta_id;
369 else {
370 /* Find index into station table for destination station */
371 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
372 if (sta_id == IWL_INVALID_STATION) {
373 IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
374 hdr->addr1);
375 goto drop_unlock_priv;
376 }
377 }
378
379 IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
380
381 if (info->control.sta)
382 sta_priv = (void *)info->control.sta->drv_priv;
383
384 if (sta_priv && sta_priv->asleep &&
385 (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
386 /*
387 * This sends an asynchronous command to the device,
388 * but we can rely on it being processed before the
389 * next frame is processed -- and the next frame to
390 * this station is the one that will consume this
391 * counter.
392 * For now set the counter to just 1 since we do not
393 * support uAPSD yet.
394 */
395 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
396 }
397
398 /*
399 * Send this frame after DTIM -- there's a special queue
400 * reserved for this for contexts that support AP mode.
401 */
402 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
403 txq_id = ctx->mcast_queue;
404 /*
405 * The microcode will clear the more data
406 * bit in the last frame it transmits.
407 */
408 hdr->frame_control |=
409 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
410 } else
411 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
412
413 /* irqs already disabled/saved above when locking priv->lock */
414 spin_lock(&priv->sta_lock);
415
416 if (ieee80211_is_data_qos(fc)) {
417 u8 *qc = NULL;
418 qc = ieee80211_get_qos_ctl(hdr);
419 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
420
421 if (WARN_ON_ONCE(tid >= MAX_TID_COUNT))
422 goto drop_unlock_sta;
423
424 seq_number = priv->stations[sta_id].tid[tid].seq_number;
425 seq_number &= IEEE80211_SCTL_SEQ;
426 hdr->seq_ctrl = hdr->seq_ctrl &
427 cpu_to_le16(IEEE80211_SCTL_FRAG);
428 hdr->seq_ctrl |= cpu_to_le16(seq_number);
429 seq_number += 0x10;
430 /* aggregation is on for this <sta,tid> */
431 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
432 priv->stations[sta_id].tid[tid].agg.state == IWL_AGG_ON) {
433 txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
434 is_agg = true;
435 }
436 }
437
438 tx_cmd = trans_get_tx_cmd(&priv->trans, txq_id);
439 if (unlikely(!tx_cmd))
440 goto drop_unlock_sta;
441
442 /* Copy MAC header from skb into command buffer */
443 memcpy(tx_cmd->hdr, hdr, hdr_len);
444
445 /* Total # bytes to be transmitted */
446 len = (u16)skb->len;
447 tx_cmd->len = cpu_to_le16(len);
448
449 if (info->control.hw_key)
450 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
451
452 /* TODO need this for burst mode later on */
453 iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
454 iwl_dbg_log_tx_data_frame(priv, len, hdr);
455
456 iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
457
458 iwl_update_stats(priv, true, fc, len);
459
460 if (trans_tx(&priv->trans, skb, tx_cmd, txq_id, fc, is_agg, ctx))
461 goto drop_unlock_sta;
462
463 if (ieee80211_is_data_qos(fc)) {
464 priv->stations[sta_id].tid[tid].tfds_in_queue++;
465 if (!ieee80211_has_morefrags(fc))
466 priv->stations[sta_id].tid[tid].seq_number = seq_number;
467 }
468
469 spin_unlock(&priv->sta_lock);
470 spin_unlock_irqrestore(&priv->lock, flags);
471
472 /*
473 * Avoid atomic ops if it isn't an associated client.
474 * Also, if this is a packet for aggregation, don't
475 * increase the counter because the ucode will stop
476 * aggregation queues when their respective station
477 * goes to sleep.
478 */
479 if (sta_priv && sta_priv->client && !is_agg)
480 atomic_inc(&sta_priv->pending_frames);
481
482 return 0;
483
484drop_unlock_sta:
485 spin_unlock(&priv->sta_lock);
486drop_unlock_priv:
487 spin_unlock_irqrestore(&priv->lock, flags);
488 return -1;
489}
490
491/*
492 * Find first available (lowest unused) Tx Queue, mark it "active".
493 * Called only when finding queue for aggregation.
494 * Should never return anything < 7, because they should already
495 * be in use as EDCA AC (0-3), Command (4), reserved (5, 6)
496 */
497static int iwlagn_txq_ctx_activate_free(struct iwl_priv *priv)
498{
499 int txq_id;
500
501 for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
502 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
503 return txq_id;
504 return -1;
505}
506
507int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
508 struct ieee80211_sta *sta, u16 tid, u16 *ssn)
509{
510 int sta_id;
511 int tx_fifo;
512 int txq_id;
513 int ret;
514 unsigned long flags;
515 struct iwl_tid_data *tid_data;
516
517 tx_fifo = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
518 if (unlikely(tx_fifo < 0))
519 return tx_fifo;
520
521 IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
522 sta->addr, tid);
523
524 sta_id = iwl_sta_id(sta);
525 if (sta_id == IWL_INVALID_STATION) {
526 IWL_ERR(priv, "Start AGG on invalid station\n");
527 return -ENXIO;
528 }
529 if (unlikely(tid >= MAX_TID_COUNT))
530 return -EINVAL;
531
532 if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
533 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
534 return -ENXIO;
535 }
536
537 txq_id = iwlagn_txq_ctx_activate_free(priv);
538 if (txq_id == -1) {
539 IWL_ERR(priv, "No free aggregation queue available\n");
540 return -ENXIO;
541 }
542
543 spin_lock_irqsave(&priv->sta_lock, flags);
544 tid_data = &priv->stations[sta_id].tid[tid];
545 *ssn = SEQ_TO_SN(tid_data->seq_number);
546 tid_data->agg.txq_id = txq_id;
547 tid_data->agg.tx_fifo = tx_fifo;
548 iwl_set_swq_id(&priv->txq[txq_id], get_ac_from_tid(tid), txq_id);
549 spin_unlock_irqrestore(&priv->sta_lock, flags);
550
551 ret = iwlagn_txq_agg_enable(priv, txq_id, sta_id, tid);
552 if (ret)
553 return ret;
554
555 spin_lock_irqsave(&priv->sta_lock, flags);
556 tid_data = &priv->stations[sta_id].tid[tid];
557 if (tid_data->tfds_in_queue == 0) {
558 IWL_DEBUG_HT(priv, "HW queue is empty\n");
559 tid_data->agg.state = IWL_AGG_ON;
560 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
561 } else {
562 IWL_DEBUG_HT(priv, "HW queue is NOT empty: %d packets in HW queue\n",
563 tid_data->tfds_in_queue);
564 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
565 }
566 spin_unlock_irqrestore(&priv->sta_lock, flags);
567 return ret;
568}
569
570int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
571 struct ieee80211_sta *sta, u16 tid)
572{
573 int tx_fifo_id, txq_id, sta_id, ssn;
574 struct iwl_tid_data *tid_data;
575 int write_ptr, read_ptr;
576 unsigned long flags;
577
578 tx_fifo_id = get_fifo_from_tid(iwl_rxon_ctx_from_vif(vif), tid);
579 if (unlikely(tx_fifo_id < 0))
580 return tx_fifo_id;
581
582 sta_id = iwl_sta_id(sta);
583
584 if (sta_id == IWL_INVALID_STATION) {
585 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
586 return -ENXIO;
587 }
588
589 spin_lock_irqsave(&priv->sta_lock, flags);
590
591 tid_data = &priv->stations[sta_id].tid[tid];
592 ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
593 txq_id = tid_data->agg.txq_id;
594
595 switch (priv->stations[sta_id].tid[tid].agg.state) {
596 case IWL_EMPTYING_HW_QUEUE_ADDBA:
597 /*
598 * This can happen if the peer stops aggregation
599 * again before we've had a chance to drain the
600 * queue we selected previously, i.e. before the
601 * session was really started completely.
602 */
603 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
604 goto turn_off;
605 case IWL_AGG_ON:
606 break;
607 default:
608 IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
609 }
610
611 write_ptr = priv->txq[txq_id].q.write_ptr;
612 read_ptr = priv->txq[txq_id].q.read_ptr;
613
614 /* The queue is not empty */
615 if (write_ptr != read_ptr) {
616 IWL_DEBUG_HT(priv, "Stopping a non empty AGG HW QUEUE\n");
617 priv->stations[sta_id].tid[tid].agg.state =
618 IWL_EMPTYING_HW_QUEUE_DELBA;
619 spin_unlock_irqrestore(&priv->sta_lock, flags);
620 return 0;
621 }
622
623 IWL_DEBUG_HT(priv, "HW queue is empty\n");
624 turn_off:
625 priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
626
627 /* do not restore/save irqs */
628 spin_unlock(&priv->sta_lock);
629 spin_lock(&priv->lock);
630
631 /*
632 * the only reason this call can fail is queue number out of range,
633 * which can happen if uCode is reloaded and all the station
634 * information are lost. if it is outside the range, there is no need
635 * to deactivate the uCode queue, just return "success" to allow
636 * mac80211 to clean up it own data.
637 */
638 trans_txq_agg_disable(&priv->trans, txq_id, ssn, tx_fifo_id);
639 spin_unlock_irqrestore(&priv->lock, flags);
640
641 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
642
643 return 0;
644}
645
646int iwlagn_txq_check_empty(struct iwl_priv *priv,
647 int sta_id, u8 tid, int txq_id)
648{
649 struct iwl_queue *q = &priv->txq[txq_id].q;
650 u8 *addr = priv->stations[sta_id].sta.sta.addr;
651 struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
652 struct iwl_rxon_context *ctx;
653
654 ctx = &priv->contexts[priv->stations[sta_id].ctxid];
655
656 lockdep_assert_held(&priv->sta_lock);
657
658 switch (priv->stations[sta_id].tid[tid].agg.state) {
659 case IWL_EMPTYING_HW_QUEUE_DELBA:
660 /* We are reclaiming the last packet of the */
661 /* aggregated HW queue */
662 if ((txq_id == tid_data->agg.txq_id) &&
663 (q->read_ptr == q->write_ptr)) {
664 u16 ssn = SEQ_TO_SN(tid_data->seq_number);
665 int tx_fifo = get_fifo_from_tid(ctx, tid);
666 IWL_DEBUG_HT(priv, "HW queue empty: continue DELBA flow\n");
667 trans_txq_agg_disable(&priv->trans, txq_id,
668 ssn, tx_fifo);
669 tid_data->agg.state = IWL_AGG_OFF;
670 ieee80211_stop_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
671 }
672 break;
673 case IWL_EMPTYING_HW_QUEUE_ADDBA:
674 /* We are reclaiming the last packet of the queue */
675 if (tid_data->tfds_in_queue == 0) {
676 IWL_DEBUG_HT(priv, "HW queue empty: continue ADDBA flow\n");
677 tid_data->agg.state = IWL_AGG_ON;
678 ieee80211_start_tx_ba_cb_irqsafe(ctx->vif, addr, tid);
679 }
680 break;
681 }
682
683 return 0;
684}
685
686static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
687 struct iwl_rxon_context *ctx,
688 const u8 *addr1)
689{
690 struct ieee80211_sta *sta;
691 struct iwl_station_priv *sta_priv;
692
693 rcu_read_lock();
694 sta = ieee80211_find_sta(ctx->vif, addr1);
695 if (sta) {
696 sta_priv = (void *)sta->drv_priv;
697 /* avoid atomic ops if this isn't a client */
698 if (sta_priv->client &&
699 atomic_dec_return(&sta_priv->pending_frames) == 0)
700 ieee80211_sta_block_awake(priv->hw, sta, false);
701 }
702 rcu_read_unlock();
703}
704
705static void iwlagn_tx_status(struct iwl_priv *priv, struct iwl_tx_info *tx_info,
706 bool is_agg)
707{
708 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx_info->skb->data;
709
710 if (!is_agg)
711 iwlagn_non_agg_tx_status(priv, tx_info->ctx, hdr->addr1);
712
713 ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb);
714}
715
716int iwlagn_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
717{
718 struct iwl_tx_queue *txq = &priv->txq[txq_id];
719 struct iwl_queue *q = &txq->q;
720 struct iwl_tx_info *tx_info;
721 int nfreed = 0;
722 struct ieee80211_hdr *hdr;
723
724 if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) {
725 IWL_ERR(priv, "%s: Read index for DMA queue txq id (%d), "
726 "index %d is out of range [0-%d] %d %d.\n", __func__,
727 txq_id, index, q->n_bd, q->write_ptr, q->read_ptr);
728 return 0;
729 }
730
731 for (index = iwl_queue_inc_wrap(index, q->n_bd);
732 q->read_ptr != index;
733 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
734
735 tx_info = &txq->txb[txq->q.read_ptr];
736
737 if (WARN_ON_ONCE(tx_info->skb == NULL))
738 continue;
739
740 hdr = (struct ieee80211_hdr *)tx_info->skb->data;
741 if (ieee80211_is_data_qos(hdr->frame_control))
742 nfreed++;
743
744 iwlagn_tx_status(priv, tx_info,
745 txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
746 tx_info->skb = NULL;
747
748 iwlagn_txq_inval_byte_cnt_tbl(priv, txq);
749
750 iwlagn_txq_free_tfd(priv, txq, txq->q.read_ptr);
751 }
752 return nfreed;
753}
754
755/**
756 * iwlagn_tx_status_reply_compressed_ba - Update tx status from block-ack
757 *
758 * Go through block-ack's bitmap of ACK'd frames, update driver's record of
759 * ACK vs. not. This gets sent to mac80211, then to rate scaling algo.
760 */
761static int iwlagn_tx_status_reply_compressed_ba(struct iwl_priv *priv,
762 struct iwl_ht_agg *agg,
763 struct iwl_compressed_ba_resp *ba_resp)
764
765{
766 int sh;
767 u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
768 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
769 struct ieee80211_tx_info *info;
770 u64 bitmap, sent_bitmap;
771
772 if (unlikely(!agg->wait_for_ba)) {
773 if (unlikely(ba_resp->bitmap))
774 IWL_ERR(priv, "Received BA when not expected\n");
775 return -EINVAL;
776 }
777
778 /* Mark that the expected block-ack response arrived */
779 agg->wait_for_ba = 0;
780 IWL_DEBUG_TX_REPLY(priv, "BA %d %d\n", agg->start_idx, ba_resp->seq_ctl);
781
782 /* Calculate shift to align block-ack bits with our Tx window bits */
783 sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4);
784 if (sh < 0)
785 sh += 0x100;
786
787 /*
788 * Check for success or failure according to the
789 * transmitted bitmap and block-ack bitmap
790 */
791 bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
792 sent_bitmap = bitmap & agg->bitmap;
793
794 /* Sanity check values reported by uCode */
795 if (ba_resp->txed_2_done > ba_resp->txed) {
796 IWL_DEBUG_TX_REPLY(priv,
797 "bogus sent(%d) and ack(%d) count\n",
798 ba_resp->txed, ba_resp->txed_2_done);
799 /*
800 * set txed_2_done = txed,
801 * so it won't impact rate scale
802 */
803 ba_resp->txed = ba_resp->txed_2_done;
804 }
805 IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
806 ba_resp->txed, ba_resp->txed_2_done);
807
808 /* Find the first ACKed frame to store the TX status */
809 while (sent_bitmap && !(sent_bitmap & 1)) {
810 agg->start_idx = (agg->start_idx + 1) & 0xff;
811 sent_bitmap >>= 1;
812 }
813
814 info = IEEE80211_SKB_CB(priv->txq[scd_flow].txb[agg->start_idx].skb);
815 memset(&info->status, 0, sizeof(info->status));
816 info->flags |= IEEE80211_TX_STAT_ACK;
817 info->flags |= IEEE80211_TX_STAT_AMPDU;
818 info->status.ampdu_ack_len = ba_resp->txed_2_done;
819 info->status.ampdu_len = ba_resp->txed;
820 iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags, info);
821
822 return 0;
823}
824
825/**
826 * translate ucode response to mac80211 tx status control values
827 */
828void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
829 struct ieee80211_tx_info *info)
830{
831 struct ieee80211_tx_rate *r = &info->control.rates[0];
832
833 info->antenna_sel_tx =
834 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
835 if (rate_n_flags & RATE_MCS_HT_MSK)
836 r->flags |= IEEE80211_TX_RC_MCS;
837 if (rate_n_flags & RATE_MCS_GF_MSK)
838 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
839 if (rate_n_flags & RATE_MCS_HT40_MSK)
840 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
841 if (rate_n_flags & RATE_MCS_DUP_MSK)
842 r->flags |= IEEE80211_TX_RC_DUP_DATA;
843 if (rate_n_flags & RATE_MCS_SGI_MSK)
844 r->flags |= IEEE80211_TX_RC_SHORT_GI;
845 r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
846}
847
848/**
849 * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
850 *
851 * Handles block-acknowledge notification from device, which reports success
852 * of frames sent via aggregation.
853 */
854void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
855 struct iwl_rx_mem_buffer *rxb)
856{
857 struct iwl_rx_packet *pkt = rxb_addr(rxb);
858 struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
859 struct iwl_tx_queue *txq = NULL;
860 struct iwl_ht_agg *agg;
861 int index;
862 int sta_id;
863 int tid;
864 unsigned long flags;
865
866 /* "flow" corresponds to Tx queue */
867 u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
868
869 /* "ssn" is start of block-ack Tx window, corresponds to index
870 * (in Tx queue's circular buffer) of first TFD/frame in window */
871 u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
872
873 if (scd_flow >= priv->hw_params.max_txq_num) {
874 IWL_ERR(priv,
875 "BUG_ON scd_flow is bigger than number of queues\n");
876 return;
877 }
878
879 txq = &priv->txq[scd_flow];
880 sta_id = ba_resp->sta_id;
881 tid = ba_resp->tid;
882 agg = &priv->stations[sta_id].tid[tid].agg;
883 if (unlikely(agg->txq_id != scd_flow)) {
884 /*
885 * FIXME: this is a uCode bug which need to be addressed,
886 * log the information and return for now!
887 * since it is possible happen very often and in order
888 * not to fill the syslog, don't enable the logging by default
889 */
890 IWL_DEBUG_TX_REPLY(priv,
891 "BA scd_flow %d does not match txq_id %d\n",
892 scd_flow, agg->txq_id);
893 return;
894 }
895
896 /* Find index just before block-ack window */
897 index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
898
899 spin_lock_irqsave(&priv->sta_lock, flags);
900
901 IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
902 "sta_id = %d\n",
903 agg->wait_for_ba,
904 (u8 *) &ba_resp->sta_addr_lo32,
905 ba_resp->sta_id);
906 IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = "
907 "%d, scd_ssn = %d\n",
908 ba_resp->tid,
909 ba_resp->seq_ctl,
910 (unsigned long long)le64_to_cpu(ba_resp->bitmap),
911 ba_resp->scd_flow,
912 ba_resp->scd_ssn);
913 IWL_DEBUG_TX_REPLY(priv, "DAT start_idx = %d, bitmap = 0x%llx\n",
914 agg->start_idx,
915 (unsigned long long)agg->bitmap);
916
917 /* Update driver's record of ACK vs. not for each frame in window */
918 iwlagn_tx_status_reply_compressed_ba(priv, agg, ba_resp);
919
920 /* Release all TFDs before the SSN, i.e. all TFDs in front of
921 * block-ack window (we assume that they've been successfully
922 * transmitted ... if not, it's too late anyway). */
923 if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
924 /* calculate mac80211 ampdu sw queue to wake */
925 int freed = iwlagn_tx_queue_reclaim(priv, scd_flow, index);
926 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
927
928 if ((iwl_queue_space(&txq->q) > txq->q.low_mark) &&
929 priv->mac80211_registered &&
930 (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
931 iwl_wake_queue(priv, txq);
932
933 iwlagn_txq_check_empty(priv, sta_id, tid, scd_flow);
934 }
935
936 spin_unlock_irqrestore(&priv->sta_lock, flags);
937}
938
939#ifdef CONFIG_IWLWIFI_DEBUG
940const char *iwl_get_tx_fail_reason(u32 status)
941{
942#define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
943#define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
944
945 switch (status & TX_STATUS_MSK) {
946 case TX_STATUS_SUCCESS:
947 return "SUCCESS";
948 TX_STATUS_POSTPONE(DELAY);
949 TX_STATUS_POSTPONE(FEW_BYTES);
950 TX_STATUS_POSTPONE(BT_PRIO);
951 TX_STATUS_POSTPONE(QUIET_PERIOD);
952 TX_STATUS_POSTPONE(CALC_TTAK);
953 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
954 TX_STATUS_FAIL(SHORT_LIMIT);
955 TX_STATUS_FAIL(LONG_LIMIT);
956 TX_STATUS_FAIL(FIFO_UNDERRUN);
957 TX_STATUS_FAIL(DRAIN_FLOW);
958 TX_STATUS_FAIL(RFKILL_FLUSH);
959 TX_STATUS_FAIL(LIFE_EXPIRE);
960 TX_STATUS_FAIL(DEST_PS);
961 TX_STATUS_FAIL(HOST_ABORTED);
962 TX_STATUS_FAIL(BT_RETRY);
963 TX_STATUS_FAIL(STA_INVALID);
964 TX_STATUS_FAIL(FRAG_DROPPED);
965 TX_STATUS_FAIL(TID_DISABLE);
966 TX_STATUS_FAIL(FIFO_FLUSHED);
967 TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
968 TX_STATUS_FAIL(PASSIVE_NO_RX);
969 TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
970 }
971
972 return "UNKNOWN";
973
974#undef TX_STATUS_FAIL
975#undef TX_STATUS_POSTPONE
976}
977#endif /* CONFIG_IWLWIFI_DEBUG */