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Linux 3.11-rc3
[cris-mirror.git] / drivers / net / wireless / iwlwifi / mvm / tx.c
blobf0e96a927407d3ae1473481f5e7d3eeb894a5a2b
1 /******************************************************************************
2 *
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
5 *
6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
22 * USA
23 *
24 * The full GNU General Public License is included in this distribution
25 * in the file called COPYING.
26 *
27 * Contact Information:
28 * Intel Linux Wireless <ilw@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30 *
31 * BSD LICENSE
32 *
33 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 *
40 * * Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * * Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in
44 * the documentation and/or other materials provided with the
45 * distribution.
46 * * Neither the name Intel Corporation nor the names of its
47 * contributors may be used to endorse or promote products derived
48 * from this software without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 *
62 *****************************************************************************/
63 #include <linux/ieee80211.h>
64 #include <linux/etherdevice.h>
65
66 #include "iwl-trans.h"
67 #include "iwl-eeprom-parse.h"
68 #include "mvm.h"
69 #include "sta.h"
70
71 /*
72 * Sets most of the Tx cmd's fields
73 */
74 static void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
75 struct iwl_tx_cmd *tx_cmd,
76 struct ieee80211_tx_info *info, u8 sta_id)
77 {
78 struct ieee80211_hdr *hdr = (void *)skb->data;
79 __le16 fc = hdr->frame_control;
80 u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags);
81 u32 len = skb->len + FCS_LEN;
82
83 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
84 tx_flags |= TX_CMD_FLG_ACK;
85 else
86 tx_flags &= ~TX_CMD_FLG_ACK;
87
88 if (ieee80211_is_probe_resp(fc))
89 tx_flags |= TX_CMD_FLG_TSF;
90 else if (ieee80211_is_back_req(fc))
91 tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;
92
93 /* High prio packet (wrt. BT coex) if it is EAPOL, MCAST or MGMT */
94 if (info->band == IEEE80211_BAND_2GHZ &&
95 (skb->protocol == cpu_to_be16(ETH_P_PAE) ||
96 is_multicast_ether_addr(hdr->addr1) ||
97 ieee80211_is_back_req(fc) ||
98 ieee80211_is_mgmt(fc)))
99 tx_flags |= TX_CMD_FLG_BT_DIS;
100
101 if (ieee80211_has_morefrags(fc))
102 tx_flags |= TX_CMD_FLG_MORE_FRAG;
103
104 if (ieee80211_is_data_qos(fc)) {
105 u8 *qc = ieee80211_get_qos_ctl(hdr);
106 tx_cmd->tid_tspec = qc[0] & 0xf;
107 tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
108 } else {
109 tx_cmd->tid_tspec = IWL_TID_NON_QOS;
110 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
111 tx_flags |= TX_CMD_FLG_SEQ_CTL;
112 else
113 tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
114 }
115
116 if (ieee80211_is_mgmt(fc)) {
117 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
118 tx_cmd->pm_frame_timeout = cpu_to_le16(3);
119 else
120 tx_cmd->pm_frame_timeout = cpu_to_le16(2);
121
122 /* The spec allows Action frames in A-MPDU, we don't support
123 * it
124 */
125 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
126 } else {
127 tx_cmd->pm_frame_timeout = 0;
128 }
129
130 if (info->flags & IEEE80211_TX_CTL_AMPDU)
131 tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
132
133 if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
134 !is_multicast_ether_addr(ieee80211_get_DA(hdr)))
135 tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
136
137 tx_cmd->driver_txop = 0;
138 tx_cmd->tx_flags = cpu_to_le32(tx_flags);
139 /* Total # bytes to be transmitted */
140 tx_cmd->len = cpu_to_le16((u16)skb->len);
141 tx_cmd->next_frame_len = 0;
142 tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
143 tx_cmd->sta_id = sta_id;
144 }
145
146 /*
147 * Sets the fields in the Tx cmd that are rate related
148 */
149 static void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm,
150 struct iwl_tx_cmd *tx_cmd,
151 struct ieee80211_tx_info *info,
152 struct ieee80211_sta *sta,
153 __le16 fc)
154 {
155 u32 rate_flags;
156 int rate_idx;
157 u8 rate_plcp;
158
159 /* Set retry limit on RTS packets */
160 tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT;
161
162 /* Set retry limit on DATA packets and Probe Responses*/
163 if (ieee80211_is_probe_resp(fc)) {
164 tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT;
165 tx_cmd->rts_retry_limit =
166 min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit);
167 } else if (ieee80211_is_back_req(fc)) {
168 tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT;
169 } else {
170 tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY;
171 }
172
173 /*
174 * for data packets, rate info comes from the table inside he fw. This
175 * table is controlled by LINK_QUALITY commands
176 */
177
178 if (ieee80211_is_data(fc) && sta) {
179 tx_cmd->initial_rate_index = 0;
180 tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
181 return;
182 } else if (ieee80211_is_back_req(fc)) {
183 tx_cmd->tx_flags |=
184 cpu_to_le32(TX_CMD_FLG_ACK | TX_CMD_FLG_BAR);
185 }
186
187 /* HT rate doesn't make sense for a non data frame */
188 WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
189 "Got an HT rate for a non data frame 0x%x\n",
190 info->control.rates[0].flags);
191
192 rate_idx = info->control.rates[0].idx;
193 /* if the rate isn't a well known legacy rate, take the lowest one */
194 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY)
195 rate_idx = rate_lowest_index(
196 &mvm->nvm_data->bands[info->band], sta);
197
198 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
199 if (info->band == IEEE80211_BAND_5GHZ)
200 rate_idx += IWL_FIRST_OFDM_RATE;
201
202 /* For 2.4 GHZ band, check that there is no need to remap */
203 BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
204
205 /* Get PLCP rate for tx_cmd->rate_n_flags */
206 rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx);
207
208 mvm->mgmt_last_antenna_idx =
209 iwl_mvm_next_antenna(mvm, iwl_fw_valid_tx_ant(mvm->fw),
210 mvm->mgmt_last_antenna_idx);
211 rate_flags = BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;
212
213 /* Set CCK flag as needed */
214 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
215 rate_flags |= RATE_MCS_CCK_MSK;
216
217 /* Set the rate in the TX cmd */
218 tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags);
219 }
220
221 /*
222 * Sets the fields in the Tx cmd that are crypto related
223 */
224 static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
225 struct ieee80211_tx_info *info,
226 struct iwl_tx_cmd *tx_cmd,
227 struct sk_buff *skb_frag)
228 {
229 struct ieee80211_key_conf *keyconf = info->control.hw_key;
230
231 switch (keyconf->cipher) {
232 case WLAN_CIPHER_SUITE_CCMP:
233 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
234 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
235 if (info->flags & IEEE80211_TX_CTL_AMPDU)
236 tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_CCMP_AGG);
237 break;
238
239 case WLAN_CIPHER_SUITE_TKIP:
240 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
241 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
242 break;
243
244 case WLAN_CIPHER_SUITE_WEP104:
245 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
246 /* fall through */
247 case WLAN_CIPHER_SUITE_WEP40:
248 tx_cmd->sec_ctl |= TX_CMD_SEC_WEP |
249 ((keyconf->keyidx << TX_CMD_SEC_WEP_KEY_IDX_POS) &
250 TX_CMD_SEC_WEP_KEY_IDX_MSK);
251
252 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
253 break;
254 default:
255 IWL_ERR(mvm, "Unknown encode cipher %x\n", keyconf->cipher);
256 break;
257 }
258 }
259
260 /*
261 * Allocates and sets the Tx cmd the driver data pointers in the skb
262 */
263 static struct iwl_device_cmd *
264 iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
265 struct ieee80211_sta *sta, u8 sta_id)
266 {
267 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
268 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
269 struct iwl_device_cmd *dev_cmd;
270 struct iwl_tx_cmd *tx_cmd;
271
272 dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans);
273
274 if (unlikely(!dev_cmd))
275 return NULL;
276
277 memset(dev_cmd, 0, sizeof(*dev_cmd));
278 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
279
280 if (info->control.hw_key)
281 iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb);
282
283 iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id);
284
285 iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);
286
287 memset(&info->status, 0, sizeof(info->status));
288
289 info->driver_data[0] = NULL;
290 info->driver_data[1] = dev_cmd;
291
292 return dev_cmd;
293 }
294
295 int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
296 {
297 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
298 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
299 struct iwl_device_cmd *dev_cmd;
300 struct iwl_tx_cmd *tx_cmd;
301 u8 sta_id;
302
303 if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU))
304 return -1;
305
306 if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
307 (!info->control.vif ||
308 info->hw_queue != info->control.vif->cab_queue)))
309 return -1;
310
311 /*
312 * If the interface on which frame is sent is the P2P_DEVICE
313 * or an AP/GO interface use the broadcast station associated
314 * with it; otherwise use the AUX station.
315 */
316 if (info->control.vif &&
317 (info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
318 info->control.vif->type == NL80211_IFTYPE_AP)) {
319 struct iwl_mvm_vif *mvmvif =
320 iwl_mvm_vif_from_mac80211(info->control.vif);
321 sta_id = mvmvif->bcast_sta.sta_id;
322 } else {
323 sta_id = mvm->aux_sta.sta_id;
324 }
325
326 IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, info->hw_queue);
327
328 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, NULL, sta_id);
329 if (!dev_cmd)
330 return -1;
331
332 /* From now on, we cannot access info->control */
333 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
334
335 /* Copy MAC header from skb into command buffer */
336 memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(hdr->frame_control));
337
338 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, info->hw_queue)) {
339 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
340 return -1;
341 }
342
343 return 0;
344 }
345
346 /*
347 * Sets the fields in the Tx cmd that are crypto related
348 */
349 int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
350 struct ieee80211_sta *sta)
351 {
352 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
353 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
354 struct iwl_mvm_sta *mvmsta;
355 struct iwl_device_cmd *dev_cmd;
356 struct iwl_tx_cmd *tx_cmd;
357 __le16 fc;
358 u16 seq_number = 0;
359 u8 tid = IWL_MAX_TID_COUNT;
360 u8 txq_id = info->hw_queue;
361 bool is_data_qos = false, is_ampdu = false;
362
363 mvmsta = (void *)sta->drv_priv;
364 fc = hdr->frame_control;
365
366 if (WARN_ON_ONCE(!mvmsta))
367 return -1;
368
369 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
370 return -1;
371
372 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, sta, mvmsta->sta_id);
373 if (!dev_cmd)
374 goto drop;
375
376 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
377 /* From now on, we cannot access info->control */
378
379 spin_lock(&mvmsta->lock);
380
381 if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
382 u8 *qc = NULL;
383 qc = ieee80211_get_qos_ctl(hdr);
384 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
385 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
386 goto drop_unlock_sta;
387
388 seq_number = mvmsta->tid_data[tid].seq_number;
389 seq_number &= IEEE80211_SCTL_SEQ;
390 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
391 hdr->seq_ctrl |= cpu_to_le16(seq_number);
392 seq_number += 0x10;
393 is_data_qos = true;
394 is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
395 }
396
397 /* Copy MAC header from skb into command buffer */
398 memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(fc));
399
400 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
401
402 if (is_ampdu) {
403 if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON))
404 goto drop_unlock_sta;
405 txq_id = mvmsta->tid_data[tid].txq_id;
406 }
407
408 IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
409 tid, txq_id, seq_number);
410
411 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
412 goto drop_unlock_sta;
413
414 if (is_data_qos && !ieee80211_has_morefrags(fc))
415 mvmsta->tid_data[tid].seq_number = seq_number;
416
417 spin_unlock(&mvmsta->lock);
418
419 if (txq_id < IWL_MVM_FIRST_AGG_QUEUE)
420 atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);
421
422 return 0;
423
424 drop_unlock_sta:
425 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
426 spin_unlock(&mvmsta->lock);
427 drop:
428 return -1;
429 }
430
431 static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
432 struct ieee80211_sta *sta, u8 tid)
433 {
434 struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
435 struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
436 struct ieee80211_vif *vif = mvmsta->vif;
437
438 lockdep_assert_held(&mvmsta->lock);
439
440 if (tid_data->ssn != tid_data->next_reclaimed)
441 return;
442
443 switch (tid_data->state) {
444 case IWL_EMPTYING_HW_QUEUE_ADDBA:
445 IWL_DEBUG_TX_QUEUES(mvm,
446 "Can continue addBA flow ssn = next_recl = %d\n",
447 tid_data->next_reclaimed);
448 tid_data->state = IWL_AGG_STARTING;
449 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
450 break;
451
452 case IWL_EMPTYING_HW_QUEUE_DELBA:
453 IWL_DEBUG_TX_QUEUES(mvm,
454 "Can continue DELBA flow ssn = next_recl = %d\n",
455 tid_data->next_reclaimed);
456 iwl_trans_txq_disable(mvm->trans, tid_data->txq_id);
457 tid_data->state = IWL_AGG_OFF;
458 /*
459 * we can't hold the mutex - but since we are after a sequence
460 * point (call to iwl_trans_txq_disable), so we don't even need
461 * a memory barrier.
462 */
463 mvm->queue_to_mac80211[tid_data->txq_id] =
464 IWL_INVALID_MAC80211_QUEUE;
465 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
466 break;
467
468 default:
469 break;
470 }
471 }
472
473 #ifdef CONFIG_IWLWIFI_DEBUG
474 const char *iwl_mvm_get_tx_fail_reason(u32 status)
475 {
476 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
477 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
478
479 switch (status & TX_STATUS_MSK) {
480 case TX_STATUS_SUCCESS:
481 return "SUCCESS";
482 TX_STATUS_POSTPONE(DELAY);
483 TX_STATUS_POSTPONE(FEW_BYTES);
484 TX_STATUS_POSTPONE(BT_PRIO);
485 TX_STATUS_POSTPONE(QUIET_PERIOD);
486 TX_STATUS_POSTPONE(CALC_TTAK);
487 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
488 TX_STATUS_FAIL(SHORT_LIMIT);
489 TX_STATUS_FAIL(LONG_LIMIT);
490 TX_STATUS_FAIL(UNDERRUN);
491 TX_STATUS_FAIL(DRAIN_FLOW);
492 TX_STATUS_FAIL(RFKILL_FLUSH);
493 TX_STATUS_FAIL(LIFE_EXPIRE);
494 TX_STATUS_FAIL(DEST_PS);
495 TX_STATUS_FAIL(HOST_ABORTED);
496 TX_STATUS_FAIL(BT_RETRY);
497 TX_STATUS_FAIL(STA_INVALID);
498 TX_STATUS_FAIL(FRAG_DROPPED);
499 TX_STATUS_FAIL(TID_DISABLE);
500 TX_STATUS_FAIL(FIFO_FLUSHED);
501 TX_STATUS_FAIL(SMALL_CF_POLL);
502 TX_STATUS_FAIL(FW_DROP);
503 TX_STATUS_FAIL(STA_COLOR_MISMATCH);
504 }
505
506 return "UNKNOWN";
507
508 #undef TX_STATUS_FAIL
509 #undef TX_STATUS_POSTPONE
510 }
511 #endif /* CONFIG_IWLWIFI_DEBUG */
512
513 /**
514 * translate ucode response to mac80211 tx status control values
515 */
516 static void iwl_mvm_hwrate_to_tx_control(u32 rate_n_flags,
517 struct ieee80211_tx_info *info)
518 {
519 struct ieee80211_tx_rate *r = &info->status.rates[0];
520
521 info->status.antenna =
522 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
523 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
524 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
525 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
526 case RATE_MCS_CHAN_WIDTH_20:
527 break;
528 case RATE_MCS_CHAN_WIDTH_40:
529 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
530 break;
531 case RATE_MCS_CHAN_WIDTH_80:
532 r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
533 break;
534 case RATE_MCS_CHAN_WIDTH_160:
535 r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
536 break;
537 }
538 if (rate_n_flags & RATE_MCS_SGI_MSK)
539 r->flags |= IEEE80211_TX_RC_SHORT_GI;
540 if (rate_n_flags & RATE_MCS_HT_MSK) {
541 r->flags |= IEEE80211_TX_RC_MCS;
542 r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
543 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
544 ieee80211_rate_set_vht(
545 r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
546 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
547 RATE_VHT_MCS_NSS_POS) + 1);
548 r->flags |= IEEE80211_TX_RC_VHT_MCS;
549 } else {
550 r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
551 info->band);
552 }
553 }
554
555 static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
556 struct iwl_rx_packet *pkt)
557 {
558 struct ieee80211_sta *sta;
559 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
560 int txq_id = SEQ_TO_QUEUE(sequence);
561 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
562 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
563 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
564 u32 status = le16_to_cpu(tx_resp->status.status);
565 u16 ssn = iwl_mvm_get_scd_ssn(tx_resp);
566 struct iwl_mvm_sta *mvmsta;
567 struct sk_buff_head skbs;
568 u8 skb_freed = 0;
569 u16 next_reclaimed, seq_ctl;
570
571 __skb_queue_head_init(&skbs);
572
573 seq_ctl = le16_to_cpu(tx_resp->seq_ctl);
574
575 /* we can free until ssn % q.n_bd not inclusive */
576 iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);
577
578 while (!skb_queue_empty(&skbs)) {
579 struct sk_buff *skb = __skb_dequeue(&skbs);
580 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
581
582 skb_freed++;
583
584 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
585
586 memset(&info->status, 0, sizeof(info->status));
587
588 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
589
590 /* inform mac80211 about what happened with the frame */
591 switch (status & TX_STATUS_MSK) {
592 case TX_STATUS_SUCCESS:
593 case TX_STATUS_DIRECT_DONE:
594 info->flags |= IEEE80211_TX_STAT_ACK;
595 break;
596 case TX_STATUS_FAIL_DEST_PS:
597 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
598 break;
599 default:
600 break;
601 }
602
603 info->status.rates[0].count = tx_resp->failure_frame + 1;
604 iwl_mvm_hwrate_to_tx_control(le32_to_cpu(tx_resp->initial_rate),
605 info);
606
607 /* Single frame failure in an AMPDU queue => send BAR */
608 if (txq_id >= IWL_MVM_FIRST_AGG_QUEUE &&
609 !(info->flags & IEEE80211_TX_STAT_ACK))
610 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
611
612 /* W/A FW bug: seq_ctl is wrong when the status isn't success */
613 if (status != TX_STATUS_SUCCESS) {
614 struct ieee80211_hdr *hdr = (void *)skb->data;
615 seq_ctl = le16_to_cpu(hdr->seq_ctrl);
616 }
617
618 ieee80211_tx_status_ni(mvm->hw, skb);
619 }
620
621 if (txq_id >= IWL_MVM_FIRST_AGG_QUEUE) {
622 /* If this is an aggregation queue, we use the ssn since:
623 * ssn = wifi seq_num % 256.
624 * The seq_ctl is the sequence control of the packet to which
625 * this Tx response relates. But if there is a hole in the
626 * bitmap of the BA we received, this Tx response may allow to
627 * reclaim the hole and all the subsequent packets that were
628 * already acked. In that case, seq_ctl != ssn, and the next
629 * packet to be reclaimed will be ssn and not seq_ctl. In that
630 * case, several packets will be reclaimed even if
631 * frame_count = 1.
632 *
633 * The ssn is the index (% 256) of the latest packet that has
634 * treated (acked / dropped) + 1.
635 */
636 next_reclaimed = ssn;
637 } else {
638 /* The next packet to be reclaimed is the one after this one */
639 next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
640 }
641
642 IWL_DEBUG_TX_REPLY(mvm,
643 "TXQ %d status %s (0x%08x)\n",
644 txq_id, iwl_mvm_get_tx_fail_reason(status), status);
645
646 IWL_DEBUG_TX_REPLY(mvm,
647 "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
648 le32_to_cpu(tx_resp->initial_rate),
649 tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
650 ssn, next_reclaimed, seq_ctl);
651
652 rcu_read_lock();
653
654 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
655
656 if (!IS_ERR_OR_NULL(sta)) {
657 mvmsta = (void *)sta->drv_priv;
658
659 if (tid != IWL_TID_NON_QOS) {
660 struct iwl_mvm_tid_data *tid_data =
661 &mvmsta->tid_data[tid];
662
663 spin_lock_bh(&mvmsta->lock);
664 tid_data->next_reclaimed = next_reclaimed;
665 IWL_DEBUG_TX_REPLY(mvm, "Next reclaimed packet:%d\n",
666 next_reclaimed);
667 iwl_mvm_check_ratid_empty(mvm, sta, tid);
668 spin_unlock_bh(&mvmsta->lock);
669 }
670
671 #ifdef CONFIG_PM_SLEEP
672 mvmsta->last_seq_ctl = seq_ctl;
673 #endif
674 } else {
675 sta = NULL;
676 mvmsta = NULL;
677 }
678
679 /*
680 * If the txq is not an AMPDU queue, there is no chance we freed
681 * several skbs. Check that out...
682 */
683 if (txq_id < IWL_MVM_FIRST_AGG_QUEUE && !WARN_ON(skb_freed > 1) &&
684 atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id])) {
685 if (mvmsta) {
686 /*
687 * If there are no pending frames for this STA, notify
688 * mac80211 that this station can go to sleep in its
689 * STA table.
690 */
691 if (mvmsta->vif->type == NL80211_IFTYPE_AP)
692 ieee80211_sta_block_awake(mvm->hw, sta, false);
693 /*
694 * We might very well have taken mvmsta pointer while
695 * the station was being removed. The remove flow might
696 * have seen a pending_frame (because we didn't take
697 * the lock) even if now the queues are drained. So make
698 * really sure now that this the station is not being
699 * removed. If it is, run the drain worker to remove it.
700 */
701 spin_lock_bh(&mvmsta->lock);
702 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
703 if (IS_ERR_OR_NULL(sta)) {
704 /*
705 * Station disappeared in the meantime:
706 * so we are draining.
707 */
708 set_bit(sta_id, mvm->sta_drained);
709 schedule_work(&mvm->sta_drained_wk);
710 }
711 spin_unlock_bh(&mvmsta->lock);
712 } else if (!mvmsta) {
713 /* Tx response without STA, so we are draining */
714 set_bit(sta_id, mvm->sta_drained);
715 schedule_work(&mvm->sta_drained_wk);
716 }
717 }
718
719 rcu_read_unlock();
720 }
721
722 #ifdef CONFIG_IWLWIFI_DEBUG
723 #define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
724 static const char *iwl_get_agg_tx_status(u16 status)
725 {
726 switch (status & AGG_TX_STATE_STATUS_MSK) {
727 AGG_TX_STATE_(TRANSMITTED);
728 AGG_TX_STATE_(UNDERRUN);
729 AGG_TX_STATE_(BT_PRIO);
730 AGG_TX_STATE_(FEW_BYTES);
731 AGG_TX_STATE_(ABORT);
732 AGG_TX_STATE_(LAST_SENT_TTL);
733 AGG_TX_STATE_(LAST_SENT_TRY_CNT);
734 AGG_TX_STATE_(LAST_SENT_BT_KILL);
735 AGG_TX_STATE_(SCD_QUERY);
736 AGG_TX_STATE_(TEST_BAD_CRC32);
737 AGG_TX_STATE_(RESPONSE);
738 AGG_TX_STATE_(DUMP_TX);
739 AGG_TX_STATE_(DELAY_TX);
740 }
741
742 return "UNKNOWN";
743 }
744
745 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
746 struct iwl_rx_packet *pkt)
747 {
748 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
749 struct agg_tx_status *frame_status = &tx_resp->status;
750 int i;
751
752 for (i = 0; i < tx_resp->frame_count; i++) {
753 u16 fstatus = le16_to_cpu(frame_status[i].status);
754
755 IWL_DEBUG_TX_REPLY(mvm,
756 "status %s (0x%04x), try-count (%d) seq (0x%x)\n",
757 iwl_get_agg_tx_status(fstatus),
758 fstatus & AGG_TX_STATE_STATUS_MSK,
759 (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
760 AGG_TX_STATE_TRY_CNT_POS,
761 le16_to_cpu(frame_status[i].sequence));
762 }
763 }
764 #else
765 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
766 struct iwl_rx_packet *pkt)
767 {}
768 #endif /* CONFIG_IWLWIFI_DEBUG */
769
770 static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
771 struct iwl_rx_packet *pkt)
772 {
773 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
774 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
775 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
776 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
777 struct ieee80211_sta *sta;
778
779 if (WARN_ON_ONCE(SEQ_TO_QUEUE(sequence) < IWL_MVM_FIRST_AGG_QUEUE))
780 return;
781
782 if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
783 return;
784
785 iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);
786
787 rcu_read_lock();
788
789 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
790
791 if (!WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
792 struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
793 mvmsta->tid_data[tid].rate_n_flags =
794 le32_to_cpu(tx_resp->initial_rate);
795 }
796
797 rcu_read_unlock();
798 }
799
800 int iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
801 struct iwl_device_cmd *cmd)
802 {
803 struct iwl_rx_packet *pkt = rxb_addr(rxb);
804 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
805
806 if (tx_resp->frame_count == 1)
807 iwl_mvm_rx_tx_cmd_single(mvm, pkt);
808 else
809 iwl_mvm_rx_tx_cmd_agg(mvm, pkt);
810
811 return 0;
812 }
813
814 int iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
815 struct iwl_device_cmd *cmd)
816 {
817 struct iwl_rx_packet *pkt = rxb_addr(rxb);
818 struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data;
819 struct sk_buff_head reclaimed_skbs;
820 struct iwl_mvm_tid_data *tid_data;
821 struct ieee80211_tx_info *info;
822 struct ieee80211_sta *sta;
823 struct iwl_mvm_sta *mvmsta;
824 struct ieee80211_hdr *hdr;
825 struct sk_buff *skb;
826 int sta_id, tid, freed;
827
828 /* "flow" corresponds to Tx queue */
829 u16 scd_flow = le16_to_cpu(ba_notif->scd_flow);
830
831 /* "ssn" is start of block-ack Tx window, corresponds to index
832 * (in Tx queue's circular buffer) of first TFD/frame in window */
833 u16 ba_resp_scd_ssn = le16_to_cpu(ba_notif->scd_ssn);
834
835 sta_id = ba_notif->sta_id;
836 tid = ba_notif->tid;
837
838 rcu_read_lock();
839
840 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
841
842 /* Reclaiming frames for a station that has been deleted ? */
843 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
844 rcu_read_unlock();
845 return 0;
846 }
847
848 mvmsta = (void *)sta->drv_priv;
849 tid_data = &mvmsta->tid_data[tid];
850
851 if (WARN_ONCE(tid_data->txq_id != scd_flow, "Q %d, tid %d, flow %d",
852 tid_data->txq_id, tid, scd_flow)) {
853 rcu_read_unlock();
854 return 0;
855 }
856
857 spin_lock_bh(&mvmsta->lock);
858
859 __skb_queue_head_init(&reclaimed_skbs);
860
861 /*
862 * Release all TFDs before the SSN, i.e. all TFDs in front of
863 * block-ack window (we assume that they've been successfully
864 * transmitted ... if not, it's too late anyway).
865 */
866 iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn,
867 &reclaimed_skbs);
868
869 IWL_DEBUG_TX_REPLY(mvm,
870 "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
871 (u8 *)&ba_notif->sta_addr_lo32,
872 ba_notif->sta_id);
873 IWL_DEBUG_TX_REPLY(mvm,
874 "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
875 ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
876 (unsigned long long)le64_to_cpu(ba_notif->bitmap),
877 scd_flow, ba_resp_scd_ssn, ba_notif->txed,
878 ba_notif->txed_2_done);
879
880 tid_data->next_reclaimed = ba_resp_scd_ssn;
881
882 iwl_mvm_check_ratid_empty(mvm, sta, tid);
883
884 freed = 0;
885
886 skb_queue_walk(&reclaimed_skbs, skb) {
887 hdr = (struct ieee80211_hdr *)skb->data;
888
889 if (ieee80211_is_data_qos(hdr->frame_control))
890 freed++;
891 else
892 WARN_ON_ONCE(1);
893
894 info = IEEE80211_SKB_CB(skb);
895 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
896
897 if (freed == 1) {
898 /* this is the first skb we deliver in this batch */
899 /* put the rate scaling data there */
900 info = IEEE80211_SKB_CB(skb);
901 memset(&info->status, 0, sizeof(info->status));
902 info->flags |= IEEE80211_TX_STAT_ACK;
903 info->flags |= IEEE80211_TX_STAT_AMPDU;
904 info->status.ampdu_ack_len = ba_notif->txed_2_done;
905 info->status.ampdu_len = ba_notif->txed;
906 iwl_mvm_hwrate_to_tx_control(tid_data->rate_n_flags,
907 info);
908 }
909 }
910
911 spin_unlock_bh(&mvmsta->lock);
912
913 rcu_read_unlock();
914
915 while (!skb_queue_empty(&reclaimed_skbs)) {
916 skb = __skb_dequeue(&reclaimed_skbs);
917 ieee80211_tx_status_ni(mvm->hw, skb);
918 }
919
920 return 0;
921 }
922
923 int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, bool sync)
924 {
925 int ret;
926 struct iwl_tx_path_flush_cmd flush_cmd = {
927 .queues_ctl = cpu_to_le32(tfd_msk),
928 .flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
929 };
930
931 u32 flags = sync ? CMD_SYNC : CMD_ASYNC;
932
933 ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags,
934 sizeof(flush_cmd), &flush_cmd);
935 if (ret)
936 IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
937 return ret;
938 }
CRIS linux kernel tree