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Merge remote-tracking branch 'battery/for-next'
[deliverable/linux.git] / drivers / net / wireless / intel / iwlwifi / mvm / tx.c
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 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
10 * Copyright(c) 2016 Intel Deutschland GmbH
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of version 2 of the GNU General Public License as
14 * published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
24 * USA
25 *
26 * The full GNU General Public License is included in this distribution
27 * in the file called COPYING.
28 *
29 * Contact Information:
30 * Intel Linux Wireless <linuxwifi@intel.com>
31 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
32 *
33 * BSD LICENSE
34 *
35 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
36 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
37 * All rights reserved.
38 *
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
41 * are met:
42 *
43 * * Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * * Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in
47 * the documentation and/or other materials provided with the
48 * distribution.
49 * * Neither the name Intel Corporation nor the names of its
50 * contributors may be used to endorse or promote products derived
51 * from this software without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
54 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
55 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
56 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
57 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
58 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
59 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
60 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
61 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
62 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
63 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64 *
65 *****************************************************************************/
66 #include <linux/ieee80211.h>
67 #include <linux/etherdevice.h>
68 #include <linux/tcp.h>
69 #include <net/ip.h>
70 #include <net/ipv6.h>
71
72 #include "iwl-trans.h"
73 #include "iwl-eeprom-parse.h"
74 #include "mvm.h"
75 #include "sta.h"
76 #include "fw-dbg.h"
77
78 static void
79 iwl_mvm_bar_check_trigger(struct iwl_mvm *mvm, const u8 *addr,
80 u16 tid, u16 ssn)
81 {
82 struct iwl_fw_dbg_trigger_tlv *trig;
83 struct iwl_fw_dbg_trigger_ba *ba_trig;
84
85 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_BA))
86 return;
87
88 trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_BA);
89 ba_trig = (void *)trig->data;
90
91 if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
92 return;
93
94 if (!(le16_to_cpu(ba_trig->tx_bar) & BIT(tid)))
95 return;
96
97 iwl_mvm_fw_dbg_collect_trig(mvm, trig,
98 "BAR sent to %pM, tid %d, ssn %d",
99 addr, tid, ssn);
100 }
101
102 #define OPT_HDR(type, skb, off) \
103 (type *)(skb_network_header(skb) + (off))
104
105 static void iwl_mvm_tx_csum(struct iwl_mvm *mvm, struct sk_buff *skb,
106 struct ieee80211_hdr *hdr,
107 struct ieee80211_tx_info *info,
108 struct iwl_tx_cmd *tx_cmd)
109 {
110 #if IS_ENABLED(CONFIG_INET)
111 u16 mh_len = ieee80211_hdrlen(hdr->frame_control);
112 u16 offload_assist = le16_to_cpu(tx_cmd->offload_assist);
113 u8 protocol = 0;
114
115 /*
116 * Do not compute checksum if already computed or if transport will
117 * compute it
118 */
119 if (skb->ip_summed != CHECKSUM_PARTIAL || IWL_MVM_SW_TX_CSUM_OFFLOAD)
120 return;
121
122 /* We do not expect to be requested to csum stuff we do not support */
123 if (WARN_ONCE(!(mvm->hw->netdev_features & IWL_TX_CSUM_NETIF_FLAGS) ||
124 (skb->protocol != htons(ETH_P_IP) &&
125 skb->protocol != htons(ETH_P_IPV6)),
126 "No support for requested checksum\n")) {
127 skb_checksum_help(skb);
128 return;
129 }
130
131 if (skb->protocol == htons(ETH_P_IP)) {
132 protocol = ip_hdr(skb)->protocol;
133 } else {
134 #if IS_ENABLED(CONFIG_IPV6)
135 struct ipv6hdr *ipv6h =
136 (struct ipv6hdr *)skb_network_header(skb);
137 unsigned int off = sizeof(*ipv6h);
138
139 protocol = ipv6h->nexthdr;
140 while (protocol != NEXTHDR_NONE && ipv6_ext_hdr(protocol)) {
141 struct ipv6_opt_hdr *hp;
142
143 /* only supported extension headers */
144 if (protocol != NEXTHDR_ROUTING &&
145 protocol != NEXTHDR_HOP &&
146 protocol != NEXTHDR_DEST) {
147 skb_checksum_help(skb);
148 return;
149 }
150
151 hp = OPT_HDR(struct ipv6_opt_hdr, skb, off);
152 protocol = hp->nexthdr;
153 off += ipv6_optlen(hp);
154 }
155 /* if we get here - protocol now should be TCP/UDP */
156 #endif
157 }
158
159 if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP) {
160 WARN_ON_ONCE(1);
161 skb_checksum_help(skb);
162 return;
163 }
164
165 /* enable L4 csum */
166 offload_assist |= BIT(TX_CMD_OFFLD_L4_EN);
167
168 /*
169 * Set offset to IP header (snap).
170 * We don't support tunneling so no need to take care of inner header.
171 * Size is in words.
172 */
173 offload_assist |= (4 << TX_CMD_OFFLD_IP_HDR);
174
175 /* Do IPv4 csum for AMSDU only (no IP csum for Ipv6) */
176 if (skb->protocol == htons(ETH_P_IP) &&
177 (offload_assist & BIT(TX_CMD_OFFLD_AMSDU))) {
178 ip_hdr(skb)->check = 0;
179 offload_assist |= BIT(TX_CMD_OFFLD_L3_EN);
180 }
181
182 /* reset UDP/TCP header csum */
183 if (protocol == IPPROTO_TCP)
184 tcp_hdr(skb)->check = 0;
185 else
186 udp_hdr(skb)->check = 0;
187
188 /* mac header len should include IV, size is in words */
189 if (info->control.hw_key)
190 mh_len += info->control.hw_key->iv_len;
191 mh_len /= 2;
192 offload_assist |= mh_len << TX_CMD_OFFLD_MH_SIZE;
193
194 tx_cmd->offload_assist = cpu_to_le16(offload_assist);
195 #endif
196 }
197
198 /*
199 * Sets most of the Tx cmd's fields
200 */
201 void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
202 struct iwl_tx_cmd *tx_cmd,
203 struct ieee80211_tx_info *info, u8 sta_id)
204 {
205 struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
206 struct ieee80211_hdr *hdr = (void *)skb->data;
207 __le16 fc = hdr->frame_control;
208 u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags);
209 u32 len = skb->len + FCS_LEN;
210 u8 ac;
211
212 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
213 tx_flags |= TX_CMD_FLG_ACK;
214 else
215 tx_flags &= ~TX_CMD_FLG_ACK;
216
217 if (ieee80211_is_probe_resp(fc))
218 tx_flags |= TX_CMD_FLG_TSF;
219
220 if (ieee80211_has_morefrags(fc))
221 tx_flags |= TX_CMD_FLG_MORE_FRAG;
222
223 if (ieee80211_is_data_qos(fc)) {
224 u8 *qc = ieee80211_get_qos_ctl(hdr);
225 tx_cmd->tid_tspec = qc[0] & 0xf;
226 tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
227 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
228 tx_cmd->offload_assist |=
229 cpu_to_le16(BIT(TX_CMD_OFFLD_AMSDU));
230 } else if (ieee80211_is_back_req(fc)) {
231 struct ieee80211_bar *bar = (void *)skb->data;
232 u16 control = le16_to_cpu(bar->control);
233 u16 ssn = le16_to_cpu(bar->start_seq_num);
234
235 tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;
236 tx_cmd->tid_tspec = (control &
237 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
238 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
239 WARN_ON_ONCE(tx_cmd->tid_tspec >= IWL_MAX_TID_COUNT);
240 iwl_mvm_bar_check_trigger(mvm, bar->ra, tx_cmd->tid_tspec,
241 ssn);
242 } else {
243 tx_cmd->tid_tspec = IWL_TID_NON_QOS;
244 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
245 tx_flags |= TX_CMD_FLG_SEQ_CTL;
246 else
247 tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
248 }
249
250 /* Default to 0 (BE) when tid_spec is set to IWL_TID_NON_QOS */
251 if (tx_cmd->tid_tspec < IWL_MAX_TID_COUNT)
252 ac = tid_to_mac80211_ac[tx_cmd->tid_tspec];
253 else
254 ac = tid_to_mac80211_ac[0];
255
256 tx_flags |= iwl_mvm_bt_coex_tx_prio(mvm, hdr, info, ac) <<
257 TX_CMD_FLG_BT_PRIO_POS;
258
259 if (ieee80211_is_mgmt(fc)) {
260 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
261 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_ASSOC);
262 else if (ieee80211_is_action(fc))
263 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
264 else
265 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
266
267 /* The spec allows Action frames in A-MPDU, we don't support
268 * it
269 */
270 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
271 } else if (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
272 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
273 } else {
274 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
275 }
276
277 if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
278 !is_multicast_ether_addr(ieee80211_get_DA(hdr)))
279 tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
280
281 if (fw_has_capa(&mvm->fw->ucode_capa,
282 IWL_UCODE_TLV_CAPA_TXPOWER_INSERTION_SUPPORT) &&
283 ieee80211_action_contains_tpc(skb))
284 tx_flags |= TX_CMD_FLG_WRITE_TX_POWER;
285
286 tx_cmd->tx_flags = cpu_to_le32(tx_flags);
287 /* Total # bytes to be transmitted */
288 tx_cmd->len = cpu_to_le16((u16)skb->len +
289 (uintptr_t)skb_info->driver_data[0]);
290 tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
291 tx_cmd->sta_id = sta_id;
292
293 /* padding is inserted later in transport */
294 if (ieee80211_hdrlen(fc) % 4 &&
295 !(tx_cmd->offload_assist & cpu_to_le16(BIT(TX_CMD_OFFLD_AMSDU))))
296 tx_cmd->offload_assist |= cpu_to_le16(BIT(TX_CMD_OFFLD_PAD));
297
298 iwl_mvm_tx_csum(mvm, skb, hdr, info, tx_cmd);
299 }
300
301 /*
302 * Sets the fields in the Tx cmd that are rate related
303 */
304 void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm, struct iwl_tx_cmd *tx_cmd,
305 struct ieee80211_tx_info *info,
306 struct ieee80211_sta *sta, __le16 fc)
307 {
308 u32 rate_flags;
309 int rate_idx;
310 u8 rate_plcp;
311
312 /* Set retry limit on RTS packets */
313 tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT;
314
315 /* Set retry limit on DATA packets and Probe Responses*/
316 if (ieee80211_is_probe_resp(fc)) {
317 tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT;
318 tx_cmd->rts_retry_limit =
319 min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit);
320 } else if (ieee80211_is_back_req(fc)) {
321 tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT;
322 } else {
323 tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY;
324 }
325
326 /*
327 * for data packets, rate info comes from the table inside the fw. This
328 * table is controlled by LINK_QUALITY commands
329 */
330
331 if (ieee80211_is_data(fc) && sta) {
332 tx_cmd->initial_rate_index = 0;
333 tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
334 return;
335 } else if (ieee80211_is_back_req(fc)) {
336 tx_cmd->tx_flags |=
337 cpu_to_le32(TX_CMD_FLG_ACK | TX_CMD_FLG_BAR);
338 }
339
340 /* HT rate doesn't make sense for a non data frame */
341 WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
342 "Got an HT rate (flags:0x%x/mcs:%d) for a non data frame (fc:0x%x)\n",
343 info->control.rates[0].flags,
344 info->control.rates[0].idx,
345 le16_to_cpu(fc));
346
347 rate_idx = info->control.rates[0].idx;
348 /* if the rate isn't a well known legacy rate, take the lowest one */
349 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY)
350 rate_idx = rate_lowest_index(
351 &mvm->nvm_data->bands[info->band], sta);
352
353 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
354 if (info->band == NL80211_BAND_5GHZ)
355 rate_idx += IWL_FIRST_OFDM_RATE;
356
357 /* For 2.4 GHZ band, check that there is no need to remap */
358 BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
359
360 /* Get PLCP rate for tx_cmd->rate_n_flags */
361 rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx);
362
363 mvm->mgmt_last_antenna_idx =
364 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
365 mvm->mgmt_last_antenna_idx);
366
367 if (info->band == NL80211_BAND_2GHZ &&
368 !iwl_mvm_bt_coex_is_shared_ant_avail(mvm))
369 rate_flags = mvm->cfg->non_shared_ant << RATE_MCS_ANT_POS;
370 else
371 rate_flags =
372 BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;
373
374 /* Set CCK flag as needed */
375 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
376 rate_flags |= RATE_MCS_CCK_MSK;
377
378 /* Set the rate in the TX cmd */
379 tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags);
380 }
381
382 static inline void iwl_mvm_set_tx_cmd_pn(struct ieee80211_tx_info *info,
383 u8 *crypto_hdr)
384 {
385 struct ieee80211_key_conf *keyconf = info->control.hw_key;
386 u64 pn;
387
388 pn = atomic64_inc_return(&keyconf->tx_pn);
389 crypto_hdr[0] = pn;
390 crypto_hdr[2] = 0;
391 crypto_hdr[3] = 0x20 | (keyconf->keyidx << 6);
392 crypto_hdr[1] = pn >> 8;
393 crypto_hdr[4] = pn >> 16;
394 crypto_hdr[5] = pn >> 24;
395 crypto_hdr[6] = pn >> 32;
396 crypto_hdr[7] = pn >> 40;
397 }
398
399 /*
400 * Sets the fields in the Tx cmd that are crypto related
401 */
402 static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
403 struct ieee80211_tx_info *info,
404 struct iwl_tx_cmd *tx_cmd,
405 struct sk_buff *skb_frag,
406 int hdrlen)
407 {
408 struct ieee80211_key_conf *keyconf = info->control.hw_key;
409 u8 *crypto_hdr = skb_frag->data + hdrlen;
410 u64 pn;
411
412 switch (keyconf->cipher) {
413 case WLAN_CIPHER_SUITE_CCMP:
414 case WLAN_CIPHER_SUITE_CCMP_256:
415 iwl_mvm_set_tx_cmd_ccmp(info, tx_cmd);
416 iwl_mvm_set_tx_cmd_pn(info, crypto_hdr);
417 break;
418
419 case WLAN_CIPHER_SUITE_TKIP:
420 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
421 pn = atomic64_inc_return(&keyconf->tx_pn);
422 ieee80211_tkip_add_iv(crypto_hdr, keyconf, pn);
423 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
424 break;
425
426 case WLAN_CIPHER_SUITE_WEP104:
427 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
428 /* fall through */
429 case WLAN_CIPHER_SUITE_WEP40:
430 tx_cmd->sec_ctl |= TX_CMD_SEC_WEP |
431 ((keyconf->keyidx << TX_CMD_SEC_WEP_KEY_IDX_POS) &
432 TX_CMD_SEC_WEP_KEY_IDX_MSK);
433
434 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
435 break;
436 case WLAN_CIPHER_SUITE_GCMP:
437 case WLAN_CIPHER_SUITE_GCMP_256:
438 /* TODO: Taking the key from the table might introduce a race
439 * when PTK rekeying is done, having an old packets with a PN
440 * based on the old key but the message encrypted with a new
441 * one.
442 * Need to handle this.
443 */
444 tx_cmd->sec_ctl |= TX_CMD_SEC_GCMP | TC_CMD_SEC_KEY_FROM_TABLE;
445 tx_cmd->key[0] = keyconf->hw_key_idx;
446 iwl_mvm_set_tx_cmd_pn(info, crypto_hdr);
447 break;
448 default:
449 tx_cmd->sec_ctl |= TX_CMD_SEC_EXT;
450 }
451 }
452
453 /*
454 * Allocates and sets the Tx cmd the driver data pointers in the skb
455 */
456 static struct iwl_device_cmd *
457 iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
458 struct ieee80211_tx_info *info, int hdrlen,
459 struct ieee80211_sta *sta, u8 sta_id)
460 {
461 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
462 struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
463 struct iwl_device_cmd *dev_cmd;
464 struct iwl_tx_cmd *tx_cmd;
465
466 dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans);
467
468 if (unlikely(!dev_cmd))
469 return NULL;
470
471 memset(dev_cmd, 0, sizeof(*dev_cmd));
472 dev_cmd->hdr.cmd = TX_CMD;
473 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
474
475 if (info->control.hw_key)
476 iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb, hdrlen);
477
478 iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id);
479
480 iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);
481
482 memset(&skb_info->status, 0, sizeof(skb_info->status));
483 memset(skb_info->driver_data, 0, sizeof(skb_info->driver_data));
484
485 skb_info->driver_data[1] = dev_cmd;
486
487 return dev_cmd;
488 }
489
490 static int iwl_mvm_get_ctrl_vif_queue(struct iwl_mvm *mvm,
491 struct ieee80211_tx_info *info, __le16 fc)
492 {
493 if (iwl_mvm_is_dqa_supported(mvm)) {
494 if (info->control.vif->type == NL80211_IFTYPE_AP &&
495 ieee80211_is_probe_resp(fc))
496 return IWL_MVM_DQA_AP_PROBE_RESP_QUEUE;
497 else if (ieee80211_is_mgmt(fc) &&
498 info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE)
499 return IWL_MVM_DQA_P2P_DEVICE_QUEUE;
500 }
501
502 return info->hw_queue;
503 }
504
505 int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
506 {
507 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
508 struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
509 struct ieee80211_tx_info info;
510 struct iwl_device_cmd *dev_cmd;
511 struct iwl_tx_cmd *tx_cmd;
512 u8 sta_id;
513 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
514 int queue;
515
516 memcpy(&info, skb->cb, sizeof(info));
517
518 if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_AMPDU))
519 return -1;
520
521 if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
522 (!info.control.vif ||
523 info.hw_queue != info.control.vif->cab_queue)))
524 return -1;
525
526 /* This holds the amsdu headers length */
527 skb_info->driver_data[0] = (void *)(uintptr_t)0;
528
529 /*
530 * IWL_MVM_OFFCHANNEL_QUEUE is used for ROC packets that can be used
531 * in 2 different types of vifs, P2P & STATION. P2P uses the offchannel
532 * queue. STATION (HS2.0) uses the auxiliary context of the FW,
533 * and hence needs to be sent on the aux queue
534 */
535 if (IEEE80211_SKB_CB(skb)->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
536 info.control.vif->type == NL80211_IFTYPE_STATION)
537 IEEE80211_SKB_CB(skb)->hw_queue = mvm->aux_queue;
538
539 queue = info.hw_queue;
540
541 /*
542 * If the interface on which the frame is sent is the P2P_DEVICE
543 * or an AP/GO interface use the broadcast station associated
544 * with it; otherwise if the interface is a managed interface
545 * use the AP station associated with it for multicast traffic
546 * (this is not possible for unicast packets as a TLDS discovery
547 * response are sent without a station entry); otherwise use the
548 * AUX station.
549 * In DQA mode, if vif is of type STATION and frames are not multicast,
550 * they should be sent from the BSS queue. For example, TDLS setup
551 * frames should be sent on this queue, as they go through the AP.
552 */
553 sta_id = mvm->aux_sta.sta_id;
554 if (info.control.vif) {
555 struct iwl_mvm_vif *mvmvif =
556 iwl_mvm_vif_from_mac80211(info.control.vif);
557
558 if (info.control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
559 info.control.vif->type == NL80211_IFTYPE_AP) {
560 sta_id = mvmvif->bcast_sta.sta_id;
561 queue = iwl_mvm_get_ctrl_vif_queue(mvm, &info,
562 hdr->frame_control);
563 } else if (info.control.vif->type == NL80211_IFTYPE_STATION &&
564 is_multicast_ether_addr(hdr->addr1)) {
565 u8 ap_sta_id = ACCESS_ONCE(mvmvif->ap_sta_id);
566
567 if (ap_sta_id != IWL_MVM_STATION_COUNT)
568 sta_id = ap_sta_id;
569 } else if (iwl_mvm_is_dqa_supported(mvm) &&
570 info.control.vif->type == NL80211_IFTYPE_STATION) {
571 queue = IWL_MVM_DQA_BSS_CLIENT_QUEUE;
572 }
573 }
574
575 IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, queue);
576
577 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, &info, hdrlen, NULL, sta_id);
578 if (!dev_cmd)
579 return -1;
580
581 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
582
583 /* Copy MAC header from skb into command buffer */
584 memcpy(tx_cmd->hdr, hdr, hdrlen);
585
586 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, queue)) {
587 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
588 return -1;
589 }
590
591 /*
592 * Increase the pending frames counter, so that later when a reply comes
593 * in and the counter is decreased - we don't start getting negative
594 * values.
595 * Note that we don't need to make sure it isn't agg'd, since we're
596 * TXing non-sta
597 */
598 atomic_inc(&mvm->pending_frames[sta_id]);
599
600 return 0;
601 }
602
603 #ifdef CONFIG_INET
604 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
605 struct ieee80211_tx_info *info,
606 struct ieee80211_sta *sta,
607 struct sk_buff_head *mpdus_skb)
608 {
609 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
610 struct ieee80211_hdr *hdr = (void *)skb->data;
611 unsigned int mss = skb_shinfo(skb)->gso_size;
612 struct sk_buff *tmp, *next;
613 char cb[sizeof(skb->cb)];
614 unsigned int num_subframes, tcp_payload_len, subf_len, max_amsdu_len;
615 bool ipv4 = (skb->protocol == htons(ETH_P_IP));
616 u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0;
617 u16 amsdu_add, snap_ip_tcp, pad, i = 0;
618 unsigned int dbg_max_amsdu_len;
619 netdev_features_t netdev_features = NETIF_F_CSUM_MASK | NETIF_F_SG;
620 u8 *qc, tid, txf;
621
622 snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) +
623 tcp_hdrlen(skb);
624
625 qc = ieee80211_get_qos_ctl(hdr);
626 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
627 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
628 return -EINVAL;
629
630 dbg_max_amsdu_len = ACCESS_ONCE(mvm->max_amsdu_len);
631
632 if (!sta->max_amsdu_len ||
633 !ieee80211_is_data_qos(hdr->frame_control) ||
634 (!mvmsta->tlc_amsdu && !dbg_max_amsdu_len)) {
635 num_subframes = 1;
636 pad = 0;
637 goto segment;
638 }
639
640 /*
641 * Do not build AMSDU for IPv6 with extension headers.
642 * ask stack to segment and checkum the generated MPDUs for us.
643 */
644 if (skb->protocol == htons(ETH_P_IPV6) &&
645 ((struct ipv6hdr *)skb_network_header(skb))->nexthdr !=
646 IPPROTO_TCP) {
647 num_subframes = 1;
648 pad = 0;
649 netdev_features &= ~NETIF_F_CSUM_MASK;
650 goto segment;
651 }
652
653 /*
654 * No need to lock amsdu_in_ampdu_allowed since it can't be modified
655 * during an BA session.
656 */
657 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
658 !mvmsta->tid_data[tid].amsdu_in_ampdu_allowed) {
659 num_subframes = 1;
660 pad = 0;
661 goto segment;
662 }
663
664 max_amsdu_len = sta->max_amsdu_len;
665
666 /* the Tx FIFO to which this A-MSDU will be routed */
667 txf = iwl_mvm_ac_to_tx_fifo[tid_to_mac80211_ac[tid]];
668
669 /*
670 * Don't send an AMSDU that will be longer than the TXF.
671 * Add a security margin of 256 for the TX command + headers.
672 * We also want to have the start of the next packet inside the
673 * fifo to be able to send bursts.
674 */
675 max_amsdu_len = min_t(unsigned int, max_amsdu_len,
676 mvm->shared_mem_cfg.txfifo_size[txf] - 256);
677
678 if (unlikely(dbg_max_amsdu_len))
679 max_amsdu_len = min_t(unsigned int, max_amsdu_len,
680 dbg_max_amsdu_len);
681
682 /*
683 * Limit A-MSDU in A-MPDU to 4095 bytes when VHT is not
684 * supported. This is a spec requirement (IEEE 802.11-2015
685 * section 8.7.3 NOTE 3).
686 */
687 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
688 !sta->vht_cap.vht_supported)
689 max_amsdu_len = min_t(unsigned int, max_amsdu_len, 4095);
690
691 /* Sub frame header + SNAP + IP header + TCP header + MSS */
692 subf_len = sizeof(struct ethhdr) + snap_ip_tcp + mss;
693 pad = (4 - subf_len) & 0x3;
694
695 /*
696 * If we have N subframes in the A-MSDU, then the A-MSDU's size is
697 * N * subf_len + (N - 1) * pad.
698 */
699 num_subframes = (max_amsdu_len + pad) / (subf_len + pad);
700 if (num_subframes > 1)
701 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
702
703 tcp_payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
704 tcp_hdrlen(skb) + skb->data_len;
705
706 /*
707 * Make sure we have enough TBs for the A-MSDU:
708 * 2 for each subframe
709 * 1 more for each fragment
710 * 1 more for the potential data in the header
711 */
712 num_subframes =
713 min_t(unsigned int, num_subframes,
714 (mvm->trans->max_skb_frags - 1 -
715 skb_shinfo(skb)->nr_frags) / 2);
716
717 /* This skb fits in one single A-MSDU */
718 if (num_subframes * mss >= tcp_payload_len) {
719 struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
720
721 /*
722 * Compute the length of all the data added for the A-MSDU.
723 * This will be used to compute the length to write in the TX
724 * command. We have: SNAP + IP + TCP for n -1 subframes and
725 * ETH header for n subframes. Note that the original skb
726 * already had one set of SNAP / IP / TCP headers.
727 */
728 num_subframes = DIV_ROUND_UP(tcp_payload_len, mss);
729 amsdu_add = num_subframes * sizeof(struct ethhdr) +
730 (num_subframes - 1) * (snap_ip_tcp + pad);
731 /* This holds the amsdu headers length */
732 skb_info->driver_data[0] = (void *)(uintptr_t)amsdu_add;
733
734 __skb_queue_tail(mpdus_skb, skb);
735 return 0;
736 }
737
738 /*
739 * Trick the segmentation function to make it
740 * create SKBs that can fit into one A-MSDU.
741 */
742 segment:
743 skb_shinfo(skb)->gso_size = num_subframes * mss;
744 memcpy(cb, skb->cb, sizeof(cb));
745
746 next = skb_gso_segment(skb, netdev_features);
747 skb_shinfo(skb)->gso_size = mss;
748 if (WARN_ON_ONCE(IS_ERR(next)))
749 return -EINVAL;
750 else if (next)
751 consume_skb(skb);
752
753 while (next) {
754 tmp = next;
755 next = tmp->next;
756
757 memcpy(tmp->cb, cb, sizeof(tmp->cb));
758 /*
759 * Compute the length of all the data added for the A-MSDU.
760 * This will be used to compute the length to write in the TX
761 * command. We have: SNAP + IP + TCP for n -1 subframes and
762 * ETH header for n subframes.
763 */
764 tcp_payload_len = skb_tail_pointer(tmp) -
765 skb_transport_header(tmp) -
766 tcp_hdrlen(tmp) + tmp->data_len;
767
768 if (ipv4)
769 ip_hdr(tmp)->id = htons(ip_base_id + i * num_subframes);
770
771 if (tcp_payload_len > mss) {
772 struct ieee80211_tx_info *skb_info =
773 IEEE80211_SKB_CB(tmp);
774
775 num_subframes = DIV_ROUND_UP(tcp_payload_len, mss);
776 amsdu_add = num_subframes * sizeof(struct ethhdr) +
777 (num_subframes - 1) * (snap_ip_tcp + pad);
778 skb_info->driver_data[0] =
779 (void *)(uintptr_t)amsdu_add;
780 skb_shinfo(tmp)->gso_size = mss;
781 } else {
782 qc = ieee80211_get_qos_ctl((void *)tmp->data);
783
784 if (ipv4)
785 ip_send_check(ip_hdr(tmp));
786 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
787 skb_shinfo(tmp)->gso_size = 0;
788 }
789
790 tmp->prev = NULL;
791 tmp->next = NULL;
792
793 __skb_queue_tail(mpdus_skb, tmp);
794 i++;
795 }
796
797 return 0;
798 }
799 #else /* CONFIG_INET */
800 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
801 struct ieee80211_tx_info *info,
802 struct ieee80211_sta *sta,
803 struct sk_buff_head *mpdus_skb)
804 {
805 /* Impossible to get TSO with CONFIG_INET */
806 WARN_ON(1);
807
808 return -1;
809 }
810 #endif
811
812 static void iwl_mvm_tx_add_stream(struct iwl_mvm *mvm,
813 struct iwl_mvm_sta *mvm_sta, u8 tid,
814 struct sk_buff *skb)
815 {
816 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
817 u8 mac_queue = info->hw_queue;
818 struct sk_buff_head *deferred_tx_frames;
819
820 lockdep_assert_held(&mvm_sta->lock);
821
822 mvm_sta->deferred_traffic_tid_map |= BIT(tid);
823 set_bit(mvm_sta->sta_id, mvm->sta_deferred_frames);
824
825 deferred_tx_frames = &mvm_sta->tid_data[tid].deferred_tx_frames;
826
827 skb_queue_tail(deferred_tx_frames, skb);
828
829 /*
830 * The first deferred frame should've stopped the MAC queues, so we
831 * should never get a second deferred frame for the RA/TID.
832 */
833 if (!WARN(skb_queue_len(deferred_tx_frames) != 1,
834 "RATID %d/%d has %d deferred frames\n", mvm_sta->sta_id, tid,
835 skb_queue_len(deferred_tx_frames))) {
836 iwl_mvm_stop_mac_queues(mvm, BIT(mac_queue));
837 schedule_work(&mvm->add_stream_wk);
838 }
839 }
840
841 /* Check if there are any timed-out TIDs on a given shared TXQ */
842 static bool iwl_mvm_txq_should_update(struct iwl_mvm *mvm, int txq_id)
843 {
844 unsigned long queue_tid_bitmap = mvm->queue_info[txq_id].tid_bitmap;
845 unsigned long now = jiffies;
846 int tid;
847
848 for_each_set_bit(tid, &queue_tid_bitmap, IWL_MAX_TID_COUNT + 1) {
849 if (time_before(mvm->queue_info[txq_id].last_frame_time[tid] +
850 IWL_MVM_DQA_QUEUE_TIMEOUT, now))
851 return true;
852 }
853
854 return false;
855 }
856
857 /*
858 * Sets the fields in the Tx cmd that are crypto related
859 */
860 static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
861 struct ieee80211_tx_info *info,
862 struct ieee80211_sta *sta)
863 {
864 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
865 struct iwl_mvm_sta *mvmsta;
866 struct iwl_device_cmd *dev_cmd;
867 struct iwl_tx_cmd *tx_cmd;
868 __le16 fc;
869 u16 seq_number = 0;
870 u8 tid = IWL_MAX_TID_COUNT;
871 u8 txq_id = info->hw_queue;
872 bool is_ampdu = false;
873 int hdrlen;
874
875 mvmsta = iwl_mvm_sta_from_mac80211(sta);
876 fc = hdr->frame_control;
877 hdrlen = ieee80211_hdrlen(fc);
878
879 if (WARN_ON_ONCE(!mvmsta))
880 return -1;
881
882 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
883 return -1;
884
885 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, info, hdrlen,
886 sta, mvmsta->sta_id);
887 if (!dev_cmd)
888 goto drop;
889
890 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
891 /* From now on, we cannot access info->control */
892
893 /*
894 * we handle that entirely ourselves -- for uAPSD the firmware
895 * will always send a notification, and for PS-Poll responses
896 * we'll notify mac80211 when getting frame status
897 */
898 info->flags &= ~IEEE80211_TX_STATUS_EOSP;
899
900 spin_lock(&mvmsta->lock);
901
902 if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
903 u8 *qc = NULL;
904 qc = ieee80211_get_qos_ctl(hdr);
905 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
906 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
907 goto drop_unlock_sta;
908
909 seq_number = mvmsta->tid_data[tid].seq_number;
910 seq_number &= IEEE80211_SCTL_SEQ;
911 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
912 hdr->seq_ctrl |= cpu_to_le16(seq_number);
913 is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
914 } else if (iwl_mvm_is_dqa_supported(mvm) &&
915 (ieee80211_is_qos_nullfunc(fc) ||
916 ieee80211_is_nullfunc(fc))) {
917 /*
918 * nullfunc frames should go to the MGMT queue regardless of QOS
919 */
920 tid = IWL_MAX_TID_COUNT;
921 }
922
923 if (iwl_mvm_is_dqa_supported(mvm))
924 txq_id = mvmsta->tid_data[tid].txq_id;
925
926 /* Copy MAC header from skb into command buffer */
927 memcpy(tx_cmd->hdr, hdr, hdrlen);
928
929 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
930
931 if (sta->tdls && !iwl_mvm_is_dqa_supported(mvm)) {
932 /* default to TID 0 for non-QoS packets */
933 u8 tdls_tid = tid == IWL_MAX_TID_COUNT ? 0 : tid;
934
935 txq_id = mvmsta->hw_queue[tid_to_mac80211_ac[tdls_tid]];
936 }
937
938 if (is_ampdu) {
939 if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON))
940 goto drop_unlock_sta;
941 txq_id = mvmsta->tid_data[tid].txq_id;
942 }
943
944 /* Check if TXQ needs to be allocated or re-activated */
945 if (unlikely(txq_id == IEEE80211_INVAL_HW_QUEUE ||
946 !mvmsta->tid_data[tid].is_tid_active) &&
947 iwl_mvm_is_dqa_supported(mvm)) {
948 /* If TXQ needs to be allocated... */
949 if (txq_id == IEEE80211_INVAL_HW_QUEUE) {
950 iwl_mvm_tx_add_stream(mvm, mvmsta, tid, skb);
951
952 /*
953 * The frame is now deferred, and the worker scheduled
954 * will re-allocate it, so we can free it for now.
955 */
956 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
957 spin_unlock(&mvmsta->lock);
958 return 0;
959 }
960
961 /* If we are here - TXQ exists and needs to be re-activated */
962 spin_lock(&mvm->queue_info_lock);
963 mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_READY;
964 mvmsta->tid_data[tid].is_tid_active = true;
965 spin_unlock(&mvm->queue_info_lock);
966
967 IWL_DEBUG_TX_QUEUES(mvm, "Re-activating queue %d for TX\n",
968 txq_id);
969 }
970
971 if (iwl_mvm_is_dqa_supported(mvm)) {
972 /* Keep track of the time of the last frame for this RA/TID */
973 mvm->queue_info[txq_id].last_frame_time[tid] = jiffies;
974
975 /*
976 * If we have timed-out TIDs - schedule the worker that will
977 * reconfig the queues and update them
978 *
979 * Note that the mvm->queue_info_lock isn't being taken here in
980 * order to not serialize the TX flow. This isn't dangerous
981 * because scheduling mvm->add_stream_wk can't ruin the state,
982 * and if we DON'T schedule it due to some race condition then
983 * next TX we get here we will.
984 */
985 if (unlikely(mvm->queue_info[txq_id].status ==
986 IWL_MVM_QUEUE_SHARED &&
987 iwl_mvm_txq_should_update(mvm, txq_id)))
988 schedule_work(&mvm->add_stream_wk);
989 }
990
991 IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
992 tid, txq_id, IEEE80211_SEQ_TO_SN(seq_number));
993
994 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
995 goto drop_unlock_sta;
996
997 if (tid < IWL_MAX_TID_COUNT && !ieee80211_has_morefrags(fc))
998 mvmsta->tid_data[tid].seq_number = seq_number + 0x10;
999
1000 spin_unlock(&mvmsta->lock);
1001
1002 /* Increase pending frames count if this isn't AMPDU */
1003 if (!is_ampdu)
1004 atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);
1005
1006 return 0;
1007
1008 drop_unlock_sta:
1009 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
1010 spin_unlock(&mvmsta->lock);
1011 drop:
1012 return -1;
1013 }
1014
1015 int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
1016 struct ieee80211_sta *sta)
1017 {
1018 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1019 struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
1020 struct ieee80211_tx_info info;
1021 struct sk_buff_head mpdus_skbs;
1022 unsigned int payload_len;
1023 int ret;
1024
1025 if (WARN_ON_ONCE(!mvmsta))
1026 return -1;
1027
1028 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
1029 return -1;
1030
1031 memcpy(&info, skb->cb, sizeof(info));
1032
1033 /* This holds the amsdu headers length */
1034 skb_info->driver_data[0] = (void *)(uintptr_t)0;
1035
1036 if (!skb_is_gso(skb))
1037 return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1038
1039 payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
1040 tcp_hdrlen(skb) + skb->data_len;
1041
1042 if (payload_len <= skb_shinfo(skb)->gso_size)
1043 return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1044
1045 __skb_queue_head_init(&mpdus_skbs);
1046
1047 ret = iwl_mvm_tx_tso(mvm, skb, &info, sta, &mpdus_skbs);
1048 if (ret)
1049 return ret;
1050
1051 if (WARN_ON(skb_queue_empty(&mpdus_skbs)))
1052 return ret;
1053
1054 while (!skb_queue_empty(&mpdus_skbs)) {
1055 skb = __skb_dequeue(&mpdus_skbs);
1056
1057 ret = iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1058 if (ret) {
1059 __skb_queue_purge(&mpdus_skbs);
1060 return ret;
1061 }
1062 }
1063
1064 return 0;
1065 }
1066
1067 static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
1068 struct ieee80211_sta *sta, u8 tid)
1069 {
1070 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1071 struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
1072 struct ieee80211_vif *vif = mvmsta->vif;
1073
1074 lockdep_assert_held(&mvmsta->lock);
1075
1076 if ((tid_data->state == IWL_AGG_ON ||
1077 tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) &&
1078 iwl_mvm_tid_queued(tid_data) == 0) {
1079 /*
1080 * Now that this aggregation queue is empty tell mac80211 so it
1081 * knows we no longer have frames buffered for the station on
1082 * this TID (for the TIM bitmap calculation.)
1083 */
1084 ieee80211_sta_set_buffered(sta, tid, false);
1085 }
1086
1087 if (tid_data->ssn != tid_data->next_reclaimed)
1088 return;
1089
1090 switch (tid_data->state) {
1091 case IWL_EMPTYING_HW_QUEUE_ADDBA:
1092 IWL_DEBUG_TX_QUEUES(mvm,
1093 "Can continue addBA flow ssn = next_recl = %d\n",
1094 tid_data->next_reclaimed);
1095 tid_data->state = IWL_AGG_STARTING;
1096 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1097 break;
1098
1099 case IWL_EMPTYING_HW_QUEUE_DELBA:
1100 IWL_DEBUG_TX_QUEUES(mvm,
1101 "Can continue DELBA flow ssn = next_recl = %d\n",
1102 tid_data->next_reclaimed);
1103 iwl_mvm_disable_txq(mvm, tid_data->txq_id,
1104 vif->hw_queue[tid_to_mac80211_ac[tid]], tid,
1105 CMD_ASYNC);
1106 tid_data->state = IWL_AGG_OFF;
1107 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1108 break;
1109
1110 default:
1111 break;
1112 }
1113 }
1114
1115 #ifdef CONFIG_IWLWIFI_DEBUG
1116 const char *iwl_mvm_get_tx_fail_reason(u32 status)
1117 {
1118 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
1119 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
1120
1121 switch (status & TX_STATUS_MSK) {
1122 case TX_STATUS_SUCCESS:
1123 return "SUCCESS";
1124 TX_STATUS_POSTPONE(DELAY);
1125 TX_STATUS_POSTPONE(FEW_BYTES);
1126 TX_STATUS_POSTPONE(BT_PRIO);
1127 TX_STATUS_POSTPONE(QUIET_PERIOD);
1128 TX_STATUS_POSTPONE(CALC_TTAK);
1129 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
1130 TX_STATUS_FAIL(SHORT_LIMIT);
1131 TX_STATUS_FAIL(LONG_LIMIT);
1132 TX_STATUS_FAIL(UNDERRUN);
1133 TX_STATUS_FAIL(DRAIN_FLOW);
1134 TX_STATUS_FAIL(RFKILL_FLUSH);
1135 TX_STATUS_FAIL(LIFE_EXPIRE);
1136 TX_STATUS_FAIL(DEST_PS);
1137 TX_STATUS_FAIL(HOST_ABORTED);
1138 TX_STATUS_FAIL(BT_RETRY);
1139 TX_STATUS_FAIL(STA_INVALID);
1140 TX_STATUS_FAIL(FRAG_DROPPED);
1141 TX_STATUS_FAIL(TID_DISABLE);
1142 TX_STATUS_FAIL(FIFO_FLUSHED);
1143 TX_STATUS_FAIL(SMALL_CF_POLL);
1144 TX_STATUS_FAIL(FW_DROP);
1145 TX_STATUS_FAIL(STA_COLOR_MISMATCH);
1146 }
1147
1148 return "UNKNOWN";
1149
1150 #undef TX_STATUS_FAIL
1151 #undef TX_STATUS_POSTPONE
1152 }
1153 #endif /* CONFIG_IWLWIFI_DEBUG */
1154
1155 void iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,
1156 enum nl80211_band band,
1157 struct ieee80211_tx_rate *r)
1158 {
1159 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
1160 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
1161 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
1162 case RATE_MCS_CHAN_WIDTH_20:
1163 break;
1164 case RATE_MCS_CHAN_WIDTH_40:
1165 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1166 break;
1167 case RATE_MCS_CHAN_WIDTH_80:
1168 r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
1169 break;
1170 case RATE_MCS_CHAN_WIDTH_160:
1171 r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
1172 break;
1173 }
1174 if (rate_n_flags & RATE_MCS_SGI_MSK)
1175 r->flags |= IEEE80211_TX_RC_SHORT_GI;
1176 if (rate_n_flags & RATE_MCS_HT_MSK) {
1177 r->flags |= IEEE80211_TX_RC_MCS;
1178 r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
1179 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
1180 ieee80211_rate_set_vht(
1181 r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
1182 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
1183 RATE_VHT_MCS_NSS_POS) + 1);
1184 r->flags |= IEEE80211_TX_RC_VHT_MCS;
1185 } else {
1186 r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
1187 band);
1188 }
1189 }
1190
1191 /**
1192 * translate ucode response to mac80211 tx status control values
1193 */
1194 static void iwl_mvm_hwrate_to_tx_status(u32 rate_n_flags,
1195 struct ieee80211_tx_info *info)
1196 {
1197 struct ieee80211_tx_rate *r = &info->status.rates[0];
1198
1199 info->status.antenna =
1200 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
1201 iwl_mvm_hwrate_to_tx_rate(rate_n_flags, info->band, r);
1202 }
1203
1204 static void iwl_mvm_tx_status_check_trigger(struct iwl_mvm *mvm,
1205 u32 status)
1206 {
1207 struct iwl_fw_dbg_trigger_tlv *trig;
1208 struct iwl_fw_dbg_trigger_tx_status *status_trig;
1209 int i;
1210
1211 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TX_STATUS))
1212 return;
1213
1214 trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TX_STATUS);
1215 status_trig = (void *)trig->data;
1216
1217 if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
1218 return;
1219
1220 for (i = 0; i < ARRAY_SIZE(status_trig->statuses); i++) {
1221 /* don't collect on status 0 */
1222 if (!status_trig->statuses[i].status)
1223 break;
1224
1225 if (status_trig->statuses[i].status != (status & TX_STATUS_MSK))
1226 continue;
1227
1228 iwl_mvm_fw_dbg_collect_trig(mvm, trig,
1229 "Tx status %d was received",
1230 status & TX_STATUS_MSK);
1231 break;
1232 }
1233 }
1234
1235 static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
1236 struct iwl_rx_packet *pkt)
1237 {
1238 struct ieee80211_sta *sta;
1239 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1240 int txq_id = SEQ_TO_QUEUE(sequence);
1241 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1242 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
1243 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
1244 u32 status = le16_to_cpu(tx_resp->status.status);
1245 u16 ssn = iwl_mvm_get_scd_ssn(tx_resp);
1246 struct iwl_mvm_sta *mvmsta;
1247 struct sk_buff_head skbs;
1248 u8 skb_freed = 0;
1249 u16 next_reclaimed, seq_ctl;
1250 bool is_ndp = false;
1251 bool txq_agg = false; /* Is this TXQ aggregated */
1252
1253 __skb_queue_head_init(&skbs);
1254
1255 seq_ctl = le16_to_cpu(tx_resp->seq_ctl);
1256
1257 /* we can free until ssn % q.n_bd not inclusive */
1258 iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);
1259
1260 while (!skb_queue_empty(&skbs)) {
1261 struct sk_buff *skb = __skb_dequeue(&skbs);
1262 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1263
1264 skb_freed++;
1265
1266 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
1267
1268 memset(&info->status, 0, sizeof(info->status));
1269
1270 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1271
1272 /* inform mac80211 about what happened with the frame */
1273 switch (status & TX_STATUS_MSK) {
1274 case TX_STATUS_SUCCESS:
1275 case TX_STATUS_DIRECT_DONE:
1276 info->flags |= IEEE80211_TX_STAT_ACK;
1277 break;
1278 case TX_STATUS_FAIL_DEST_PS:
1279 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1280 break;
1281 default:
1282 break;
1283 }
1284
1285 iwl_mvm_tx_status_check_trigger(mvm, status);
1286
1287 info->status.rates[0].count = tx_resp->failure_frame + 1;
1288 iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate),
1289 info);
1290 info->status.status_driver_data[1] =
1291 (void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate);
1292
1293 /* Single frame failure in an AMPDU queue => send BAR */
1294 if (txq_id >= mvm->first_agg_queue &&
1295 !(info->flags & IEEE80211_TX_STAT_ACK) &&
1296 !(info->flags & IEEE80211_TX_STAT_TX_FILTERED))
1297 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1298
1299 /* W/A FW bug: seq_ctl is wrong when the status isn't success */
1300 if (status != TX_STATUS_SUCCESS) {
1301 struct ieee80211_hdr *hdr = (void *)skb->data;
1302 seq_ctl = le16_to_cpu(hdr->seq_ctrl);
1303 }
1304
1305 if (unlikely(!seq_ctl)) {
1306 struct ieee80211_hdr *hdr = (void *)skb->data;
1307
1308 /*
1309 * If it is an NDP, we can't update next_reclaim since
1310 * its sequence control is 0. Note that for that same
1311 * reason, NDPs are never sent to A-MPDU'able queues
1312 * so that we can never have more than one freed frame
1313 * for a single Tx resonse (see WARN_ON below).
1314 */
1315 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1316 is_ndp = true;
1317 }
1318
1319 /*
1320 * TODO: this is not accurate if we are freeing more than one
1321 * packet.
1322 */
1323 info->status.tx_time =
1324 le16_to_cpu(tx_resp->wireless_media_time);
1325 BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
1326 info->status.status_driver_data[0] =
1327 (void *)(uintptr_t)tx_resp->reduced_tpc;
1328
1329 ieee80211_tx_status(mvm->hw, skb);
1330 }
1331
1332 if (txq_id >= mvm->first_agg_queue) {
1333 /* If this is an aggregation queue, we use the ssn since:
1334 * ssn = wifi seq_num % 256.
1335 * The seq_ctl is the sequence control of the packet to which
1336 * this Tx response relates. But if there is a hole in the
1337 * bitmap of the BA we received, this Tx response may allow to
1338 * reclaim the hole and all the subsequent packets that were
1339 * already acked. In that case, seq_ctl != ssn, and the next
1340 * packet to be reclaimed will be ssn and not seq_ctl. In that
1341 * case, several packets will be reclaimed even if
1342 * frame_count = 1.
1343 *
1344 * The ssn is the index (% 256) of the latest packet that has
1345 * treated (acked / dropped) + 1.
1346 */
1347 next_reclaimed = ssn;
1348 } else {
1349 /* The next packet to be reclaimed is the one after this one */
1350 next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
1351 }
1352
1353 IWL_DEBUG_TX_REPLY(mvm,
1354 "TXQ %d status %s (0x%08x)\n",
1355 txq_id, iwl_mvm_get_tx_fail_reason(status), status);
1356
1357 IWL_DEBUG_TX_REPLY(mvm,
1358 "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
1359 le32_to_cpu(tx_resp->initial_rate),
1360 tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
1361 ssn, next_reclaimed, seq_ctl);
1362
1363 rcu_read_lock();
1364
1365 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1366 /*
1367 * sta can't be NULL otherwise it'd mean that the sta has been freed in
1368 * the firmware while we still have packets for it in the Tx queues.
1369 */
1370 if (WARN_ON_ONCE(!sta))
1371 goto out;
1372
1373 if (!IS_ERR(sta)) {
1374 mvmsta = iwl_mvm_sta_from_mac80211(sta);
1375
1376 if (tid != IWL_TID_NON_QOS) {
1377 struct iwl_mvm_tid_data *tid_data =
1378 &mvmsta->tid_data[tid];
1379 bool send_eosp_ndp = false;
1380
1381 spin_lock_bh(&mvmsta->lock);
1382 if (iwl_mvm_is_dqa_supported(mvm)) {
1383 enum iwl_mvm_agg_state state;
1384
1385 state = mvmsta->tid_data[tid].state;
1386 txq_agg = (state == IWL_AGG_ON ||
1387 state == IWL_EMPTYING_HW_QUEUE_DELBA);
1388 } else {
1389 txq_agg = txq_id >= mvm->first_agg_queue;
1390 }
1391
1392 if (!is_ndp) {
1393 tid_data->next_reclaimed = next_reclaimed;
1394 IWL_DEBUG_TX_REPLY(mvm,
1395 "Next reclaimed packet:%d\n",
1396 next_reclaimed);
1397 } else {
1398 IWL_DEBUG_TX_REPLY(mvm,
1399 "NDP - don't update next_reclaimed\n");
1400 }
1401
1402 iwl_mvm_check_ratid_empty(mvm, sta, tid);
1403
1404 if (mvmsta->sleep_tx_count) {
1405 mvmsta->sleep_tx_count--;
1406 if (mvmsta->sleep_tx_count &&
1407 !iwl_mvm_tid_queued(tid_data)) {
1408 /*
1409 * The number of frames in the queue
1410 * dropped to 0 even if we sent less
1411 * frames than we thought we had on the
1412 * Tx queue.
1413 * This means we had holes in the BA
1414 * window that we just filled, ask
1415 * mac80211 to send EOSP since the
1416 * firmware won't know how to do that.
1417 * Send NDP and the firmware will send
1418 * EOSP notification that will trigger
1419 * a call to ieee80211_sta_eosp().
1420 */
1421 send_eosp_ndp = true;
1422 }
1423 }
1424
1425 spin_unlock_bh(&mvmsta->lock);
1426 if (send_eosp_ndp) {
1427 iwl_mvm_sta_modify_sleep_tx_count(mvm, sta,
1428 IEEE80211_FRAME_RELEASE_UAPSD,
1429 1, tid, false, false);
1430 mvmsta->sleep_tx_count = 0;
1431 ieee80211_send_eosp_nullfunc(sta, tid);
1432 }
1433 }
1434
1435 if (mvmsta->next_status_eosp) {
1436 mvmsta->next_status_eosp = false;
1437 ieee80211_sta_eosp(sta);
1438 }
1439 } else {
1440 mvmsta = NULL;
1441 }
1442
1443 /*
1444 * If the txq is not an AMPDU queue, there is no chance we freed
1445 * several skbs. Check that out...
1446 */
1447 if (txq_agg)
1448 goto out;
1449
1450 /* We can't free more than one frame at once on a shared queue */
1451 WARN_ON(!iwl_mvm_is_dqa_supported(mvm) && (skb_freed > 1));
1452
1453 /* If we have still frames for this STA nothing to do here */
1454 if (!atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id]))
1455 goto out;
1456
1457 if (mvmsta && mvmsta->vif->type == NL80211_IFTYPE_AP) {
1458
1459 /*
1460 * If there are no pending frames for this STA and
1461 * the tx to this station is not disabled, notify
1462 * mac80211 that this station can now wake up in its
1463 * STA table.
1464 * If mvmsta is not NULL, sta is valid.
1465 */
1466
1467 spin_lock_bh(&mvmsta->lock);
1468
1469 if (!mvmsta->disable_tx)
1470 ieee80211_sta_block_awake(mvm->hw, sta, false);
1471
1472 spin_unlock_bh(&mvmsta->lock);
1473 }
1474
1475 if (PTR_ERR(sta) == -EBUSY || PTR_ERR(sta) == -ENOENT) {
1476 /*
1477 * We are draining and this was the last packet - pre_rcu_remove
1478 * has been called already. We might be after the
1479 * synchronize_net already.
1480 * Don't rely on iwl_mvm_rm_sta to see the empty Tx queues.
1481 */
1482 set_bit(sta_id, mvm->sta_drained);
1483 schedule_work(&mvm->sta_drained_wk);
1484 }
1485
1486 out:
1487 rcu_read_unlock();
1488 }
1489
1490 #ifdef CONFIG_IWLWIFI_DEBUG
1491 #define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
1492 static const char *iwl_get_agg_tx_status(u16 status)
1493 {
1494 switch (status & AGG_TX_STATE_STATUS_MSK) {
1495 AGG_TX_STATE_(TRANSMITTED);
1496 AGG_TX_STATE_(UNDERRUN);
1497 AGG_TX_STATE_(BT_PRIO);
1498 AGG_TX_STATE_(FEW_BYTES);
1499 AGG_TX_STATE_(ABORT);
1500 AGG_TX_STATE_(LAST_SENT_TTL);
1501 AGG_TX_STATE_(LAST_SENT_TRY_CNT);
1502 AGG_TX_STATE_(LAST_SENT_BT_KILL);
1503 AGG_TX_STATE_(SCD_QUERY);
1504 AGG_TX_STATE_(TEST_BAD_CRC32);
1505 AGG_TX_STATE_(RESPONSE);
1506 AGG_TX_STATE_(DUMP_TX);
1507 AGG_TX_STATE_(DELAY_TX);
1508 }
1509
1510 return "UNKNOWN";
1511 }
1512
1513 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
1514 struct iwl_rx_packet *pkt)
1515 {
1516 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1517 struct agg_tx_status *frame_status = &tx_resp->status;
1518 int i;
1519
1520 for (i = 0; i < tx_resp->frame_count; i++) {
1521 u16 fstatus = le16_to_cpu(frame_status[i].status);
1522
1523 IWL_DEBUG_TX_REPLY(mvm,
1524 "status %s (0x%04x), try-count (%d) seq (0x%x)\n",
1525 iwl_get_agg_tx_status(fstatus),
1526 fstatus & AGG_TX_STATE_STATUS_MSK,
1527 (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
1528 AGG_TX_STATE_TRY_CNT_POS,
1529 le16_to_cpu(frame_status[i].sequence));
1530 }
1531 }
1532 #else
1533 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
1534 struct iwl_rx_packet *pkt)
1535 {}
1536 #endif /* CONFIG_IWLWIFI_DEBUG */
1537
1538 static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
1539 struct iwl_rx_packet *pkt)
1540 {
1541 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1542 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
1543 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
1544 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1545 struct iwl_mvm_sta *mvmsta;
1546 int queue = SEQ_TO_QUEUE(sequence);
1547
1548 if (WARN_ON_ONCE(queue < mvm->first_agg_queue &&
1549 (!iwl_mvm_is_dqa_supported(mvm) ||
1550 (queue != IWL_MVM_DQA_BSS_CLIENT_QUEUE))))
1551 return;
1552
1553 if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
1554 return;
1555
1556 iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);
1557
1558 rcu_read_lock();
1559
1560 mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
1561
1562 if (!WARN_ON_ONCE(!mvmsta)) {
1563 mvmsta->tid_data[tid].rate_n_flags =
1564 le32_to_cpu(tx_resp->initial_rate);
1565 mvmsta->tid_data[tid].tx_time =
1566 le16_to_cpu(tx_resp->wireless_media_time);
1567 }
1568
1569 rcu_read_unlock();
1570 }
1571
1572 void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1573 {
1574 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1575 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1576
1577 if (tx_resp->frame_count == 1)
1578 iwl_mvm_rx_tx_cmd_single(mvm, pkt);
1579 else
1580 iwl_mvm_rx_tx_cmd_agg(mvm, pkt);
1581 }
1582
1583 static void iwl_mvm_tx_info_from_ba_notif(struct ieee80211_tx_info *info,
1584 struct iwl_mvm_ba_notif *ba_notif,
1585 struct iwl_mvm_tid_data *tid_data)
1586 {
1587 info->flags |= IEEE80211_TX_STAT_AMPDU;
1588 info->status.ampdu_ack_len = ba_notif->txed_2_done;
1589 info->status.ampdu_len = ba_notif->txed;
1590 iwl_mvm_hwrate_to_tx_status(tid_data->rate_n_flags,
1591 info);
1592 /* TODO: not accounted if the whole A-MPDU failed */
1593 info->status.tx_time = tid_data->tx_time;
1594 info->status.status_driver_data[0] =
1595 (void *)(uintptr_t)ba_notif->reduced_txp;
1596 info->status.status_driver_data[1] =
1597 (void *)(uintptr_t)tid_data->rate_n_flags;
1598 }
1599
1600 void iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1601 {
1602 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1603 struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data;
1604 struct sk_buff_head reclaimed_skbs;
1605 struct iwl_mvm_tid_data *tid_data;
1606 struct ieee80211_sta *sta;
1607 struct iwl_mvm_sta *mvmsta;
1608 struct sk_buff *skb;
1609 int sta_id, tid, freed;
1610 /* "flow" corresponds to Tx queue */
1611 u16 scd_flow = le16_to_cpu(ba_notif->scd_flow);
1612 /* "ssn" is start of block-ack Tx window, corresponds to index
1613 * (in Tx queue's circular buffer) of first TFD/frame in window */
1614 u16 ba_resp_scd_ssn = le16_to_cpu(ba_notif->scd_ssn);
1615
1616 sta_id = ba_notif->sta_id;
1617 tid = ba_notif->tid;
1618
1619 if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT ||
1620 tid >= IWL_MAX_TID_COUNT,
1621 "sta_id %d tid %d", sta_id, tid))
1622 return;
1623
1624 rcu_read_lock();
1625
1626 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1627
1628 /* Reclaiming frames for a station that has been deleted ? */
1629 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
1630 rcu_read_unlock();
1631 return;
1632 }
1633
1634 mvmsta = iwl_mvm_sta_from_mac80211(sta);
1635 tid_data = &mvmsta->tid_data[tid];
1636
1637 if (tid_data->txq_id != scd_flow) {
1638 IWL_ERR(mvm,
1639 "invalid BA notification: Q %d, tid %d, flow %d\n",
1640 tid_data->txq_id, tid, scd_flow);
1641 rcu_read_unlock();
1642 return;
1643 }
1644
1645 spin_lock_bh(&mvmsta->lock);
1646
1647 __skb_queue_head_init(&reclaimed_skbs);
1648
1649 /*
1650 * Release all TFDs before the SSN, i.e. all TFDs in front of
1651 * block-ack window (we assume that they've been successfully
1652 * transmitted ... if not, it's too late anyway).
1653 */
1654 iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn,
1655 &reclaimed_skbs);
1656
1657 IWL_DEBUG_TX_REPLY(mvm,
1658 "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
1659 (u8 *)&ba_notif->sta_addr_lo32,
1660 ba_notif->sta_id);
1661 IWL_DEBUG_TX_REPLY(mvm,
1662 "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
1663 ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
1664 (unsigned long long)le64_to_cpu(ba_notif->bitmap),
1665 scd_flow, ba_resp_scd_ssn, ba_notif->txed,
1666 ba_notif->txed_2_done);
1667
1668 IWL_DEBUG_TX_REPLY(mvm, "reduced txp from ba notif %d\n",
1669 ba_notif->reduced_txp);
1670 tid_data->next_reclaimed = ba_resp_scd_ssn;
1671
1672 iwl_mvm_check_ratid_empty(mvm, sta, tid);
1673
1674 freed = 0;
1675
1676 skb_queue_walk(&reclaimed_skbs, skb) {
1677 struct ieee80211_hdr *hdr = (void *)skb->data;
1678 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1679
1680 if (ieee80211_is_data_qos(hdr->frame_control))
1681 freed++;
1682 else
1683 WARN_ON_ONCE(1);
1684
1685 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
1686
1687 memset(&info->status, 0, sizeof(info->status));
1688 /* Packet was transmitted successfully, failures come as single
1689 * frames because before failing a frame the firmware transmits
1690 * it without aggregation at least once.
1691 */
1692 info->flags |= IEEE80211_TX_STAT_ACK;
1693
1694 /* this is the first skb we deliver in this batch */
1695 /* put the rate scaling data there */
1696 if (freed == 1)
1697 iwl_mvm_tx_info_from_ba_notif(info, ba_notif, tid_data);
1698 }
1699
1700 spin_unlock_bh(&mvmsta->lock);
1701
1702 /* We got a BA notif with 0 acked or scd_ssn didn't progress which is
1703 * possible (i.e. first MPDU in the aggregation wasn't acked)
1704 * Still it's important to update RS about sent vs. acked.
1705 */
1706 if (skb_queue_empty(&reclaimed_skbs)) {
1707 struct ieee80211_tx_info ba_info = {};
1708 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
1709
1710 if (mvmsta->vif)
1711 chanctx_conf =
1712 rcu_dereference(mvmsta->vif->chanctx_conf);
1713
1714 if (WARN_ON_ONCE(!chanctx_conf))
1715 goto out;
1716
1717 ba_info.band = chanctx_conf->def.chan->band;
1718 iwl_mvm_tx_info_from_ba_notif(&ba_info, ba_notif, tid_data);
1719
1720 IWL_DEBUG_TX_REPLY(mvm, "No reclaim. Update rs directly\n");
1721 iwl_mvm_rs_tx_status(mvm, sta, tid, &ba_info, false);
1722 }
1723
1724 out:
1725 rcu_read_unlock();
1726
1727 while (!skb_queue_empty(&reclaimed_skbs)) {
1728 skb = __skb_dequeue(&reclaimed_skbs);
1729 ieee80211_tx_status(mvm->hw, skb);
1730 }
1731 }
1732
1733 /*
1734 * Note that there are transports that buffer frames before they reach
1735 * the firmware. This means that after flush_tx_path is called, the
1736 * queue might not be empty. The race-free way to handle this is to:
1737 * 1) set the station as draining
1738 * 2) flush the Tx path
1739 * 3) wait for the transport queues to be empty
1740 */
1741 int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, u32 flags)
1742 {
1743 int ret;
1744 struct iwl_tx_path_flush_cmd flush_cmd = {
1745 .queues_ctl = cpu_to_le32(tfd_msk),
1746 .flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
1747 };
1748
1749 ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags,
1750 sizeof(flush_cmd), &flush_cmd);
1751 if (ret)
1752 IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
1753 return ret;
1754 }
Linux kernel - Deliverables
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