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Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdim...
[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 /* IWL_MVM_OFFCHANNEL_QUEUE is used for ROC packets that can be used
517 * in 2 different types of vifs, P2P & STATION. P2P uses the offchannel
518 * queue. STATION (HS2.0) uses the auxiliary context of the FW,
519 * and hence needs to be sent on the aux queue
520 */
521 if (IEEE80211_SKB_CB(skb)->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
522 skb_info->control.vif->type == NL80211_IFTYPE_STATION)
523 IEEE80211_SKB_CB(skb)->hw_queue = mvm->aux_queue;
524
525 memcpy(&info, skb->cb, sizeof(info));
526
527 if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_AMPDU))
528 return -1;
529
530 if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
531 (!info.control.vif ||
532 info.hw_queue != info.control.vif->cab_queue)))
533 return -1;
534
535 /* This holds the amsdu headers length */
536 skb_info->driver_data[0] = (void *)(uintptr_t)0;
537
538 queue = info.hw_queue;
539
540 /*
541 * If the interface on which the frame is sent is the P2P_DEVICE
542 * or an AP/GO interface use the broadcast station associated
543 * with it; otherwise if the interface is a managed interface
544 * use the AP station associated with it for multicast traffic
545 * (this is not possible for unicast packets as a TLDS discovery
546 * response are sent without a station entry); otherwise use the
547 * AUX station.
548 * In DQA mode, if vif is of type STATION and frames are not multicast,
549 * they should be sent from the BSS queue. For example, TDLS setup
550 * frames should be sent on this queue, as they go through the AP.
551 */
552 sta_id = mvm->aux_sta.sta_id;
553 if (info.control.vif) {
554 struct iwl_mvm_vif *mvmvif =
555 iwl_mvm_vif_from_mac80211(info.control.vif);
556
557 if (info.control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
558 info.control.vif->type == NL80211_IFTYPE_AP) {
559 sta_id = mvmvif->bcast_sta.sta_id;
560 queue = iwl_mvm_get_ctrl_vif_queue(mvm, &info,
561 hdr->frame_control);
562 } else if (info.control.vif->type == NL80211_IFTYPE_STATION &&
563 is_multicast_ether_addr(hdr->addr1)) {
564 u8 ap_sta_id = ACCESS_ONCE(mvmvif->ap_sta_id);
565
566 if (ap_sta_id != IWL_MVM_STATION_COUNT)
567 sta_id = ap_sta_id;
568 } else if (iwl_mvm_is_dqa_supported(mvm) &&
569 info.control.vif->type == NL80211_IFTYPE_STATION) {
570 queue = IWL_MVM_DQA_BSS_CLIENT_QUEUE;
571 }
572 }
573
574 IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, queue);
575
576 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, &info, hdrlen, NULL, sta_id);
577 if (!dev_cmd)
578 return -1;
579
580 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
581
582 /* Copy MAC header from skb into command buffer */
583 memcpy(tx_cmd->hdr, hdr, hdrlen);
584
585 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, queue)) {
586 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
587 return -1;
588 }
589
590 /*
591 * Increase the pending frames counter, so that later when a reply comes
592 * in and the counter is decreased - we don't start getting negative
593 * values.
594 * Note that we don't need to make sure it isn't agg'd, since we're
595 * TXing non-sta
596 */
597 atomic_inc(&mvm->pending_frames[sta_id]);
598
599 return 0;
600 }
601
602 #ifdef CONFIG_INET
603 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
604 struct ieee80211_tx_info *info,
605 struct ieee80211_sta *sta,
606 struct sk_buff_head *mpdus_skb)
607 {
608 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
609 struct ieee80211_hdr *hdr = (void *)skb->data;
610 unsigned int mss = skb_shinfo(skb)->gso_size;
611 struct sk_buff *tmp, *next;
612 char cb[sizeof(skb->cb)];
613 unsigned int num_subframes, tcp_payload_len, subf_len, max_amsdu_len;
614 bool ipv4 = (skb->protocol == htons(ETH_P_IP));
615 u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0;
616 u16 amsdu_add, snap_ip_tcp, pad, i = 0;
617 unsigned int dbg_max_amsdu_len;
618 netdev_features_t netdev_features = NETIF_F_CSUM_MASK | NETIF_F_SG;
619 u8 *qc, tid, txf;
620
621 snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) +
622 tcp_hdrlen(skb);
623
624 qc = ieee80211_get_qos_ctl(hdr);
625 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
626 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
627 return -EINVAL;
628
629 dbg_max_amsdu_len = ACCESS_ONCE(mvm->max_amsdu_len);
630
631 if (!sta->max_amsdu_len ||
632 !ieee80211_is_data_qos(hdr->frame_control) ||
633 (!mvmsta->tlc_amsdu && !dbg_max_amsdu_len)) {
634 num_subframes = 1;
635 pad = 0;
636 goto segment;
637 }
638
639 /*
640 * Do not build AMSDU for IPv6 with extension headers.
641 * ask stack to segment and checkum the generated MPDUs for us.
642 */
643 if (skb->protocol == htons(ETH_P_IPV6) &&
644 ((struct ipv6hdr *)skb_network_header(skb))->nexthdr !=
645 IPPROTO_TCP) {
646 num_subframes = 1;
647 pad = 0;
648 netdev_features &= ~NETIF_F_CSUM_MASK;
649 goto segment;
650 }
651
652 /*
653 * No need to lock amsdu_in_ampdu_allowed since it can't be modified
654 * during an BA session.
655 */
656 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
657 !mvmsta->tid_data[tid].amsdu_in_ampdu_allowed) {
658 num_subframes = 1;
659 pad = 0;
660 goto segment;
661 }
662
663 max_amsdu_len = sta->max_amsdu_len;
664
665 /* the Tx FIFO to which this A-MSDU will be routed */
666 txf = iwl_mvm_ac_to_tx_fifo[tid_to_mac80211_ac[tid]];
667
668 /*
669 * Don't send an AMSDU that will be longer than the TXF.
670 * Add a security margin of 256 for the TX command + headers.
671 * We also want to have the start of the next packet inside the
672 * fifo to be able to send bursts.
673 */
674 max_amsdu_len = min_t(unsigned int, max_amsdu_len,
675 mvm->shared_mem_cfg.txfifo_size[txf] - 256);
676
677 if (unlikely(dbg_max_amsdu_len))
678 max_amsdu_len = min_t(unsigned int, max_amsdu_len,
679 dbg_max_amsdu_len);
680
681 /*
682 * Limit A-MSDU in A-MPDU to 4095 bytes when VHT is not
683 * supported. This is a spec requirement (IEEE 802.11-2015
684 * section 8.7.3 NOTE 3).
685 */
686 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
687 !sta->vht_cap.vht_supported)
688 max_amsdu_len = min_t(unsigned int, max_amsdu_len, 4095);
689
690 /* Sub frame header + SNAP + IP header + TCP header + MSS */
691 subf_len = sizeof(struct ethhdr) + snap_ip_tcp + mss;
692 pad = (4 - subf_len) & 0x3;
693
694 /*
695 * If we have N subframes in the A-MSDU, then the A-MSDU's size is
696 * N * subf_len + (N - 1) * pad.
697 */
698 num_subframes = (max_amsdu_len + pad) / (subf_len + pad);
699 if (num_subframes > 1)
700 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
701
702 tcp_payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
703 tcp_hdrlen(skb) + skb->data_len;
704
705 /*
706 * Make sure we have enough TBs for the A-MSDU:
707 * 2 for each subframe
708 * 1 more for each fragment
709 * 1 more for the potential data in the header
710 */
711 num_subframes =
712 min_t(unsigned int, num_subframes,
713 (mvm->trans->max_skb_frags - 1 -
714 skb_shinfo(skb)->nr_frags) / 2);
715
716 /* This skb fits in one single A-MSDU */
717 if (num_subframes * mss >= tcp_payload_len) {
718 struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
719
720 /*
721 * Compute the length of all the data added for the A-MSDU.
722 * This will be used to compute the length to write in the TX
723 * command. We have: SNAP + IP + TCP for n -1 subframes and
724 * ETH header for n subframes. Note that the original skb
725 * already had one set of SNAP / IP / TCP headers.
726 */
727 num_subframes = DIV_ROUND_UP(tcp_payload_len, mss);
728 amsdu_add = num_subframes * sizeof(struct ethhdr) +
729 (num_subframes - 1) * (snap_ip_tcp + pad);
730 /* This holds the amsdu headers length */
731 skb_info->driver_data[0] = (void *)(uintptr_t)amsdu_add;
732
733 __skb_queue_tail(mpdus_skb, skb);
734 return 0;
735 }
736
737 /*
738 * Trick the segmentation function to make it
739 * create SKBs that can fit into one A-MSDU.
740 */
741 segment:
742 skb_shinfo(skb)->gso_size = num_subframes * mss;
743 memcpy(cb, skb->cb, sizeof(cb));
744
745 next = skb_gso_segment(skb, netdev_features);
746 skb_shinfo(skb)->gso_size = mss;
747 if (WARN_ON_ONCE(IS_ERR(next)))
748 return -EINVAL;
749 else if (next)
750 consume_skb(skb);
751
752 while (next) {
753 tmp = next;
754 next = tmp->next;
755
756 memcpy(tmp->cb, cb, sizeof(tmp->cb));
757 /*
758 * Compute the length of all the data added for the A-MSDU.
759 * This will be used to compute the length to write in the TX
760 * command. We have: SNAP + IP + TCP for n -1 subframes and
761 * ETH header for n subframes.
762 */
763 tcp_payload_len = skb_tail_pointer(tmp) -
764 skb_transport_header(tmp) -
765 tcp_hdrlen(tmp) + tmp->data_len;
766
767 if (ipv4)
768 ip_hdr(tmp)->id = htons(ip_base_id + i * num_subframes);
769
770 if (tcp_payload_len > mss) {
771 struct ieee80211_tx_info *skb_info =
772 IEEE80211_SKB_CB(tmp);
773
774 num_subframes = DIV_ROUND_UP(tcp_payload_len, mss);
775 amsdu_add = num_subframes * sizeof(struct ethhdr) +
776 (num_subframes - 1) * (snap_ip_tcp + pad);
777 skb_info->driver_data[0] =
778 (void *)(uintptr_t)amsdu_add;
779 skb_shinfo(tmp)->gso_size = mss;
780 } else {
781 qc = ieee80211_get_qos_ctl((void *)tmp->data);
782
783 if (ipv4)
784 ip_send_check(ip_hdr(tmp));
785 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
786 skb_shinfo(tmp)->gso_size = 0;
787 }
788
789 tmp->prev = NULL;
790 tmp->next = NULL;
791
792 __skb_queue_tail(mpdus_skb, tmp);
793 i++;
794 }
795
796 return 0;
797 }
798 #else /* CONFIG_INET */
799 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
800 struct ieee80211_tx_info *info,
801 struct ieee80211_sta *sta,
802 struct sk_buff_head *mpdus_skb)
803 {
804 /* Impossible to get TSO with CONFIG_INET */
805 WARN_ON(1);
806
807 return -1;
808 }
809 #endif
810
811 static void iwl_mvm_tx_add_stream(struct iwl_mvm *mvm,
812 struct iwl_mvm_sta *mvm_sta, u8 tid,
813 struct sk_buff *skb)
814 {
815 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
816 u8 mac_queue = info->hw_queue;
817 struct sk_buff_head *deferred_tx_frames;
818
819 lockdep_assert_held(&mvm_sta->lock);
820
821 mvm_sta->deferred_traffic_tid_map |= BIT(tid);
822 set_bit(mvm_sta->sta_id, mvm->sta_deferred_frames);
823
824 deferred_tx_frames = &mvm_sta->tid_data[tid].deferred_tx_frames;
825
826 skb_queue_tail(deferred_tx_frames, skb);
827
828 /*
829 * The first deferred frame should've stopped the MAC queues, so we
830 * should never get a second deferred frame for the RA/TID.
831 */
832 if (!WARN(skb_queue_len(deferred_tx_frames) != 1,
833 "RATID %d/%d has %d deferred frames\n", mvm_sta->sta_id, tid,
834 skb_queue_len(deferred_tx_frames))) {
835 iwl_mvm_stop_mac_queues(mvm, BIT(mac_queue));
836 schedule_work(&mvm->add_stream_wk);
837 }
838 }
839
840 /*
841 * Sets the fields in the Tx cmd that are crypto related
842 */
843 static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
844 struct ieee80211_tx_info *info,
845 struct ieee80211_sta *sta)
846 {
847 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
848 struct iwl_mvm_sta *mvmsta;
849 struct iwl_device_cmd *dev_cmd;
850 struct iwl_tx_cmd *tx_cmd;
851 __le16 fc;
852 u16 seq_number = 0;
853 u8 tid = IWL_MAX_TID_COUNT;
854 u8 txq_id = info->hw_queue;
855 bool is_ampdu = false;
856 int hdrlen;
857
858 mvmsta = iwl_mvm_sta_from_mac80211(sta);
859 fc = hdr->frame_control;
860 hdrlen = ieee80211_hdrlen(fc);
861
862 if (WARN_ON_ONCE(!mvmsta))
863 return -1;
864
865 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
866 return -1;
867
868 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, info, hdrlen,
869 sta, mvmsta->sta_id);
870 if (!dev_cmd)
871 goto drop;
872
873 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
874 /* From now on, we cannot access info->control */
875
876 /*
877 * we handle that entirely ourselves -- for uAPSD the firmware
878 * will always send a notification, and for PS-Poll responses
879 * we'll notify mac80211 when getting frame status
880 */
881 info->flags &= ~IEEE80211_TX_STATUS_EOSP;
882
883 spin_lock(&mvmsta->lock);
884
885 if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
886 u8 *qc = NULL;
887 qc = ieee80211_get_qos_ctl(hdr);
888 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
889 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
890 goto drop_unlock_sta;
891
892 seq_number = mvmsta->tid_data[tid].seq_number;
893 seq_number &= IEEE80211_SCTL_SEQ;
894 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
895 hdr->seq_ctrl |= cpu_to_le16(seq_number);
896 is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
897 } else if (iwl_mvm_is_dqa_supported(mvm) &&
898 (ieee80211_is_qos_nullfunc(fc) ||
899 ieee80211_is_nullfunc(fc))) {
900 /*
901 * nullfunc frames should go to the MGMT queue regardless of QOS
902 */
903 tid = IWL_MAX_TID_COUNT;
904 }
905
906 if (iwl_mvm_is_dqa_supported(mvm))
907 txq_id = mvmsta->tid_data[tid].txq_id;
908
909 /* Copy MAC header from skb into command buffer */
910 memcpy(tx_cmd->hdr, hdr, hdrlen);
911
912 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
913
914 if (sta->tdls && !iwl_mvm_is_dqa_supported(mvm)) {
915 /* default to TID 0 for non-QoS packets */
916 u8 tdls_tid = tid == IWL_MAX_TID_COUNT ? 0 : tid;
917
918 txq_id = mvmsta->hw_queue[tid_to_mac80211_ac[tdls_tid]];
919 }
920
921 if (is_ampdu) {
922 if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON))
923 goto drop_unlock_sta;
924 txq_id = mvmsta->tid_data[tid].txq_id;
925 }
926
927 /* Check if TXQ needs to be allocated or re-activated */
928 if (unlikely(txq_id == IEEE80211_INVAL_HW_QUEUE ||
929 !mvmsta->tid_data[tid].is_tid_active) &&
930 iwl_mvm_is_dqa_supported(mvm)) {
931 /* If TXQ needs to be allocated... */
932 if (txq_id == IEEE80211_INVAL_HW_QUEUE) {
933 iwl_mvm_tx_add_stream(mvm, mvmsta, tid, skb);
934
935 /*
936 * The frame is now deferred, and the worker scheduled
937 * will re-allocate it, so we can free it for now.
938 */
939 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
940 spin_unlock(&mvmsta->lock);
941 return 0;
942
943 }
944
945 /* If we are here - TXQ exists and needs to be re-activated */
946 spin_lock(&mvm->queue_info_lock);
947 mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_READY;
948 mvmsta->tid_data[tid].is_tid_active = true;
949 spin_unlock(&mvm->queue_info_lock);
950
951 IWL_DEBUG_TX_QUEUES(mvm, "Re-activating queue %d for TX\n",
952 txq_id);
953 }
954
955 /* Keep track of the time of the last frame for this RA/TID */
956 mvm->queue_info[txq_id].last_frame_time[tid] = jiffies;
957
958 IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
959 tid, txq_id, IEEE80211_SEQ_TO_SN(seq_number));
960
961 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
962 goto drop_unlock_sta;
963
964 if (tid < IWL_MAX_TID_COUNT && !ieee80211_has_morefrags(fc))
965 mvmsta->tid_data[tid].seq_number = seq_number + 0x10;
966
967 spin_unlock(&mvmsta->lock);
968
969 /* Increase pending frames count if this isn't AMPDU */
970 if (!is_ampdu)
971 atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);
972
973 return 0;
974
975 drop_unlock_sta:
976 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
977 spin_unlock(&mvmsta->lock);
978 drop:
979 return -1;
980 }
981
982 int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
983 struct ieee80211_sta *sta)
984 {
985 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
986 struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
987 struct ieee80211_tx_info info;
988 struct sk_buff_head mpdus_skbs;
989 unsigned int payload_len;
990 int ret;
991
992 if (WARN_ON_ONCE(!mvmsta))
993 return -1;
994
995 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
996 return -1;
997
998 memcpy(&info, skb->cb, sizeof(info));
999
1000 /* This holds the amsdu headers length */
1001 skb_info->driver_data[0] = (void *)(uintptr_t)0;
1002
1003 if (!skb_is_gso(skb))
1004 return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1005
1006 payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
1007 tcp_hdrlen(skb) + skb->data_len;
1008
1009 if (payload_len <= skb_shinfo(skb)->gso_size)
1010 return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1011
1012 __skb_queue_head_init(&mpdus_skbs);
1013
1014 ret = iwl_mvm_tx_tso(mvm, skb, &info, sta, &mpdus_skbs);
1015 if (ret)
1016 return ret;
1017
1018 if (WARN_ON(skb_queue_empty(&mpdus_skbs)))
1019 return ret;
1020
1021 while (!skb_queue_empty(&mpdus_skbs)) {
1022 skb = __skb_dequeue(&mpdus_skbs);
1023
1024 ret = iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1025 if (ret) {
1026 __skb_queue_purge(&mpdus_skbs);
1027 return ret;
1028 }
1029 }
1030
1031 return 0;
1032 }
1033
1034 static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
1035 struct ieee80211_sta *sta, u8 tid)
1036 {
1037 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1038 struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
1039 struct ieee80211_vif *vif = mvmsta->vif;
1040
1041 lockdep_assert_held(&mvmsta->lock);
1042
1043 if ((tid_data->state == IWL_AGG_ON ||
1044 tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) &&
1045 iwl_mvm_tid_queued(tid_data) == 0) {
1046 /*
1047 * Now that this aggregation queue is empty tell mac80211 so it
1048 * knows we no longer have frames buffered for the station on
1049 * this TID (for the TIM bitmap calculation.)
1050 */
1051 ieee80211_sta_set_buffered(sta, tid, false);
1052 }
1053
1054 if (tid_data->ssn != tid_data->next_reclaimed)
1055 return;
1056
1057 switch (tid_data->state) {
1058 case IWL_EMPTYING_HW_QUEUE_ADDBA:
1059 IWL_DEBUG_TX_QUEUES(mvm,
1060 "Can continue addBA flow ssn = next_recl = %d\n",
1061 tid_data->next_reclaimed);
1062 tid_data->state = IWL_AGG_STARTING;
1063 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1064 break;
1065
1066 case IWL_EMPTYING_HW_QUEUE_DELBA:
1067 IWL_DEBUG_TX_QUEUES(mvm,
1068 "Can continue DELBA flow ssn = next_recl = %d\n",
1069 tid_data->next_reclaimed);
1070 iwl_mvm_disable_txq(mvm, tid_data->txq_id,
1071 vif->hw_queue[tid_to_mac80211_ac[tid]], tid,
1072 CMD_ASYNC);
1073 tid_data->state = IWL_AGG_OFF;
1074 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1075 break;
1076
1077 default:
1078 break;
1079 }
1080 }
1081
1082 #ifdef CONFIG_IWLWIFI_DEBUG
1083 const char *iwl_mvm_get_tx_fail_reason(u32 status)
1084 {
1085 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
1086 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
1087
1088 switch (status & TX_STATUS_MSK) {
1089 case TX_STATUS_SUCCESS:
1090 return "SUCCESS";
1091 TX_STATUS_POSTPONE(DELAY);
1092 TX_STATUS_POSTPONE(FEW_BYTES);
1093 TX_STATUS_POSTPONE(BT_PRIO);
1094 TX_STATUS_POSTPONE(QUIET_PERIOD);
1095 TX_STATUS_POSTPONE(CALC_TTAK);
1096 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
1097 TX_STATUS_FAIL(SHORT_LIMIT);
1098 TX_STATUS_FAIL(LONG_LIMIT);
1099 TX_STATUS_FAIL(UNDERRUN);
1100 TX_STATUS_FAIL(DRAIN_FLOW);
1101 TX_STATUS_FAIL(RFKILL_FLUSH);
1102 TX_STATUS_FAIL(LIFE_EXPIRE);
1103 TX_STATUS_FAIL(DEST_PS);
1104 TX_STATUS_FAIL(HOST_ABORTED);
1105 TX_STATUS_FAIL(BT_RETRY);
1106 TX_STATUS_FAIL(STA_INVALID);
1107 TX_STATUS_FAIL(FRAG_DROPPED);
1108 TX_STATUS_FAIL(TID_DISABLE);
1109 TX_STATUS_FAIL(FIFO_FLUSHED);
1110 TX_STATUS_FAIL(SMALL_CF_POLL);
1111 TX_STATUS_FAIL(FW_DROP);
1112 TX_STATUS_FAIL(STA_COLOR_MISMATCH);
1113 }
1114
1115 return "UNKNOWN";
1116
1117 #undef TX_STATUS_FAIL
1118 #undef TX_STATUS_POSTPONE
1119 }
1120 #endif /* CONFIG_IWLWIFI_DEBUG */
1121
1122 void iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,
1123 enum nl80211_band band,
1124 struct ieee80211_tx_rate *r)
1125 {
1126 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
1127 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
1128 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
1129 case RATE_MCS_CHAN_WIDTH_20:
1130 break;
1131 case RATE_MCS_CHAN_WIDTH_40:
1132 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1133 break;
1134 case RATE_MCS_CHAN_WIDTH_80:
1135 r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
1136 break;
1137 case RATE_MCS_CHAN_WIDTH_160:
1138 r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
1139 break;
1140 }
1141 if (rate_n_flags & RATE_MCS_SGI_MSK)
1142 r->flags |= IEEE80211_TX_RC_SHORT_GI;
1143 if (rate_n_flags & RATE_MCS_HT_MSK) {
1144 r->flags |= IEEE80211_TX_RC_MCS;
1145 r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
1146 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
1147 ieee80211_rate_set_vht(
1148 r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
1149 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
1150 RATE_VHT_MCS_NSS_POS) + 1);
1151 r->flags |= IEEE80211_TX_RC_VHT_MCS;
1152 } else {
1153 r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
1154 band);
1155 }
1156 }
1157
1158 /**
1159 * translate ucode response to mac80211 tx status control values
1160 */
1161 static void iwl_mvm_hwrate_to_tx_status(u32 rate_n_flags,
1162 struct ieee80211_tx_info *info)
1163 {
1164 struct ieee80211_tx_rate *r = &info->status.rates[0];
1165
1166 info->status.antenna =
1167 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
1168 iwl_mvm_hwrate_to_tx_rate(rate_n_flags, info->band, r);
1169 }
1170
1171 static void iwl_mvm_tx_status_check_trigger(struct iwl_mvm *mvm,
1172 u32 status)
1173 {
1174 struct iwl_fw_dbg_trigger_tlv *trig;
1175 struct iwl_fw_dbg_trigger_tx_status *status_trig;
1176 int i;
1177
1178 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TX_STATUS))
1179 return;
1180
1181 trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TX_STATUS);
1182 status_trig = (void *)trig->data;
1183
1184 if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
1185 return;
1186
1187 for (i = 0; i < ARRAY_SIZE(status_trig->statuses); i++) {
1188 /* don't collect on status 0 */
1189 if (!status_trig->statuses[i].status)
1190 break;
1191
1192 if (status_trig->statuses[i].status != (status & TX_STATUS_MSK))
1193 continue;
1194
1195 iwl_mvm_fw_dbg_collect_trig(mvm, trig,
1196 "Tx status %d was received",
1197 status & TX_STATUS_MSK);
1198 break;
1199 }
1200 }
1201
1202 static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
1203 struct iwl_rx_packet *pkt)
1204 {
1205 struct ieee80211_sta *sta;
1206 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1207 int txq_id = SEQ_TO_QUEUE(sequence);
1208 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1209 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
1210 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
1211 u32 status = le16_to_cpu(tx_resp->status.status);
1212 u16 ssn = iwl_mvm_get_scd_ssn(tx_resp);
1213 struct iwl_mvm_sta *mvmsta;
1214 struct sk_buff_head skbs;
1215 u8 skb_freed = 0;
1216 u16 next_reclaimed, seq_ctl;
1217 bool is_ndp = false;
1218 bool txq_agg = false; /* Is this TXQ aggregated */
1219
1220 __skb_queue_head_init(&skbs);
1221
1222 seq_ctl = le16_to_cpu(tx_resp->seq_ctl);
1223
1224 /* we can free until ssn % q.n_bd not inclusive */
1225 iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);
1226
1227 while (!skb_queue_empty(&skbs)) {
1228 struct sk_buff *skb = __skb_dequeue(&skbs);
1229 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1230
1231 skb_freed++;
1232
1233 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
1234
1235 memset(&info->status, 0, sizeof(info->status));
1236
1237 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1238
1239 /* inform mac80211 about what happened with the frame */
1240 switch (status & TX_STATUS_MSK) {
1241 case TX_STATUS_SUCCESS:
1242 case TX_STATUS_DIRECT_DONE:
1243 info->flags |= IEEE80211_TX_STAT_ACK;
1244 break;
1245 case TX_STATUS_FAIL_DEST_PS:
1246 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1247 break;
1248 default:
1249 break;
1250 }
1251
1252 iwl_mvm_tx_status_check_trigger(mvm, status);
1253
1254 info->status.rates[0].count = tx_resp->failure_frame + 1;
1255 iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate),
1256 info);
1257 info->status.status_driver_data[1] =
1258 (void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate);
1259
1260 /* Single frame failure in an AMPDU queue => send BAR */
1261 if (txq_id >= mvm->first_agg_queue &&
1262 !(info->flags & IEEE80211_TX_STAT_ACK) &&
1263 !(info->flags & IEEE80211_TX_STAT_TX_FILTERED))
1264 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1265
1266 /* W/A FW bug: seq_ctl is wrong when the status isn't success */
1267 if (status != TX_STATUS_SUCCESS) {
1268 struct ieee80211_hdr *hdr = (void *)skb->data;
1269 seq_ctl = le16_to_cpu(hdr->seq_ctrl);
1270 }
1271
1272 if (unlikely(!seq_ctl)) {
1273 struct ieee80211_hdr *hdr = (void *)skb->data;
1274
1275 /*
1276 * If it is an NDP, we can't update next_reclaim since
1277 * its sequence control is 0. Note that for that same
1278 * reason, NDPs are never sent to A-MPDU'able queues
1279 * so that we can never have more than one freed frame
1280 * for a single Tx resonse (see WARN_ON below).
1281 */
1282 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1283 is_ndp = true;
1284 }
1285
1286 /*
1287 * TODO: this is not accurate if we are freeing more than one
1288 * packet.
1289 */
1290 info->status.tx_time =
1291 le16_to_cpu(tx_resp->wireless_media_time);
1292 BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
1293 info->status.status_driver_data[0] =
1294 (void *)(uintptr_t)tx_resp->reduced_tpc;
1295
1296 ieee80211_tx_status(mvm->hw, skb);
1297 }
1298
1299 if (txq_id >= mvm->first_agg_queue) {
1300 /* If this is an aggregation queue, we use the ssn since:
1301 * ssn = wifi seq_num % 256.
1302 * The seq_ctl is the sequence control of the packet to which
1303 * this Tx response relates. But if there is a hole in the
1304 * bitmap of the BA we received, this Tx response may allow to
1305 * reclaim the hole and all the subsequent packets that were
1306 * already acked. In that case, seq_ctl != ssn, and the next
1307 * packet to be reclaimed will be ssn and not seq_ctl. In that
1308 * case, several packets will be reclaimed even if
1309 * frame_count = 1.
1310 *
1311 * The ssn is the index (% 256) of the latest packet that has
1312 * treated (acked / dropped) + 1.
1313 */
1314 next_reclaimed = ssn;
1315 } else {
1316 /* The next packet to be reclaimed is the one after this one */
1317 next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
1318 }
1319
1320 IWL_DEBUG_TX_REPLY(mvm,
1321 "TXQ %d status %s (0x%08x)\n",
1322 txq_id, iwl_mvm_get_tx_fail_reason(status), status);
1323
1324 IWL_DEBUG_TX_REPLY(mvm,
1325 "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
1326 le32_to_cpu(tx_resp->initial_rate),
1327 tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
1328 ssn, next_reclaimed, seq_ctl);
1329
1330 rcu_read_lock();
1331
1332 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1333 /*
1334 * sta can't be NULL otherwise it'd mean that the sta has been freed in
1335 * the firmware while we still have packets for it in the Tx queues.
1336 */
1337 if (WARN_ON_ONCE(!sta))
1338 goto out;
1339
1340 if (!IS_ERR(sta)) {
1341 mvmsta = iwl_mvm_sta_from_mac80211(sta);
1342
1343 if (tid != IWL_TID_NON_QOS) {
1344 struct iwl_mvm_tid_data *tid_data =
1345 &mvmsta->tid_data[tid];
1346 bool send_eosp_ndp = false;
1347
1348 spin_lock_bh(&mvmsta->lock);
1349 if (iwl_mvm_is_dqa_supported(mvm)) {
1350 enum iwl_mvm_agg_state state;
1351
1352 state = mvmsta->tid_data[tid].state;
1353 txq_agg = (state == IWL_AGG_ON ||
1354 state == IWL_EMPTYING_HW_QUEUE_DELBA);
1355 } else {
1356 txq_agg = txq_id >= mvm->first_agg_queue;
1357 }
1358
1359 if (!is_ndp) {
1360 tid_data->next_reclaimed = next_reclaimed;
1361 IWL_DEBUG_TX_REPLY(mvm,
1362 "Next reclaimed packet:%d\n",
1363 next_reclaimed);
1364 } else {
1365 IWL_DEBUG_TX_REPLY(mvm,
1366 "NDP - don't update next_reclaimed\n");
1367 }
1368
1369 iwl_mvm_check_ratid_empty(mvm, sta, tid);
1370
1371 if (mvmsta->sleep_tx_count) {
1372 mvmsta->sleep_tx_count--;
1373 if (mvmsta->sleep_tx_count &&
1374 !iwl_mvm_tid_queued(tid_data)) {
1375 /*
1376 * The number of frames in the queue
1377 * dropped to 0 even if we sent less
1378 * frames than we thought we had on the
1379 * Tx queue.
1380 * This means we had holes in the BA
1381 * window that we just filled, ask
1382 * mac80211 to send EOSP since the
1383 * firmware won't know how to do that.
1384 * Send NDP and the firmware will send
1385 * EOSP notification that will trigger
1386 * a call to ieee80211_sta_eosp().
1387 */
1388 send_eosp_ndp = true;
1389 }
1390 }
1391
1392 spin_unlock_bh(&mvmsta->lock);
1393 if (send_eosp_ndp) {
1394 iwl_mvm_sta_modify_sleep_tx_count(mvm, sta,
1395 IEEE80211_FRAME_RELEASE_UAPSD,
1396 1, tid, false, false);
1397 mvmsta->sleep_tx_count = 0;
1398 ieee80211_send_eosp_nullfunc(sta, tid);
1399 }
1400 }
1401
1402 if (mvmsta->next_status_eosp) {
1403 mvmsta->next_status_eosp = false;
1404 ieee80211_sta_eosp(sta);
1405 }
1406 } else {
1407 mvmsta = NULL;
1408 }
1409
1410 /*
1411 * If the txq is not an AMPDU queue, there is no chance we freed
1412 * several skbs. Check that out...
1413 */
1414 if (txq_agg)
1415 goto out;
1416
1417 /* We can't free more than one frame at once on a shared queue */
1418 WARN_ON(!iwl_mvm_is_dqa_supported(mvm) && (skb_freed > 1));
1419
1420 /* If we have still frames for this STA nothing to do here */
1421 if (!atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id]))
1422 goto out;
1423
1424 if (mvmsta && mvmsta->vif->type == NL80211_IFTYPE_AP) {
1425
1426 /*
1427 * If there are no pending frames for this STA and
1428 * the tx to this station is not disabled, notify
1429 * mac80211 that this station can now wake up in its
1430 * STA table.
1431 * If mvmsta is not NULL, sta is valid.
1432 */
1433
1434 spin_lock_bh(&mvmsta->lock);
1435
1436 if (!mvmsta->disable_tx)
1437 ieee80211_sta_block_awake(mvm->hw, sta, false);
1438
1439 spin_unlock_bh(&mvmsta->lock);
1440 }
1441
1442 if (PTR_ERR(sta) == -EBUSY || PTR_ERR(sta) == -ENOENT) {
1443 /*
1444 * We are draining and this was the last packet - pre_rcu_remove
1445 * has been called already. We might be after the
1446 * synchronize_net already.
1447 * Don't rely on iwl_mvm_rm_sta to see the empty Tx queues.
1448 */
1449 set_bit(sta_id, mvm->sta_drained);
1450 schedule_work(&mvm->sta_drained_wk);
1451 }
1452
1453 out:
1454 rcu_read_unlock();
1455 }
1456
1457 #ifdef CONFIG_IWLWIFI_DEBUG
1458 #define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
1459 static const char *iwl_get_agg_tx_status(u16 status)
1460 {
1461 switch (status & AGG_TX_STATE_STATUS_MSK) {
1462 AGG_TX_STATE_(TRANSMITTED);
1463 AGG_TX_STATE_(UNDERRUN);
1464 AGG_TX_STATE_(BT_PRIO);
1465 AGG_TX_STATE_(FEW_BYTES);
1466 AGG_TX_STATE_(ABORT);
1467 AGG_TX_STATE_(LAST_SENT_TTL);
1468 AGG_TX_STATE_(LAST_SENT_TRY_CNT);
1469 AGG_TX_STATE_(LAST_SENT_BT_KILL);
1470 AGG_TX_STATE_(SCD_QUERY);
1471 AGG_TX_STATE_(TEST_BAD_CRC32);
1472 AGG_TX_STATE_(RESPONSE);
1473 AGG_TX_STATE_(DUMP_TX);
1474 AGG_TX_STATE_(DELAY_TX);
1475 }
1476
1477 return "UNKNOWN";
1478 }
1479
1480 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
1481 struct iwl_rx_packet *pkt)
1482 {
1483 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1484 struct agg_tx_status *frame_status = &tx_resp->status;
1485 int i;
1486
1487 for (i = 0; i < tx_resp->frame_count; i++) {
1488 u16 fstatus = le16_to_cpu(frame_status[i].status);
1489
1490 IWL_DEBUG_TX_REPLY(mvm,
1491 "status %s (0x%04x), try-count (%d) seq (0x%x)\n",
1492 iwl_get_agg_tx_status(fstatus),
1493 fstatus & AGG_TX_STATE_STATUS_MSK,
1494 (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
1495 AGG_TX_STATE_TRY_CNT_POS,
1496 le16_to_cpu(frame_status[i].sequence));
1497 }
1498 }
1499 #else
1500 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
1501 struct iwl_rx_packet *pkt)
1502 {}
1503 #endif /* CONFIG_IWLWIFI_DEBUG */
1504
1505 static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
1506 struct iwl_rx_packet *pkt)
1507 {
1508 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1509 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
1510 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
1511 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1512 struct iwl_mvm_sta *mvmsta;
1513 int queue = SEQ_TO_QUEUE(sequence);
1514
1515 if (WARN_ON_ONCE(queue < mvm->first_agg_queue &&
1516 (!iwl_mvm_is_dqa_supported(mvm) ||
1517 (queue != IWL_MVM_DQA_BSS_CLIENT_QUEUE))))
1518 return;
1519
1520 if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
1521 return;
1522
1523 iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);
1524
1525 rcu_read_lock();
1526
1527 mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
1528
1529 if (!WARN_ON_ONCE(!mvmsta)) {
1530 mvmsta->tid_data[tid].rate_n_flags =
1531 le32_to_cpu(tx_resp->initial_rate);
1532 mvmsta->tid_data[tid].tx_time =
1533 le16_to_cpu(tx_resp->wireless_media_time);
1534 }
1535
1536 rcu_read_unlock();
1537 }
1538
1539 void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1540 {
1541 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1542 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1543
1544 if (tx_resp->frame_count == 1)
1545 iwl_mvm_rx_tx_cmd_single(mvm, pkt);
1546 else
1547 iwl_mvm_rx_tx_cmd_agg(mvm, pkt);
1548 }
1549
1550 static void iwl_mvm_tx_info_from_ba_notif(struct ieee80211_tx_info *info,
1551 struct iwl_mvm_ba_notif *ba_notif,
1552 struct iwl_mvm_tid_data *tid_data)
1553 {
1554 info->flags |= IEEE80211_TX_STAT_AMPDU;
1555 info->status.ampdu_ack_len = ba_notif->txed_2_done;
1556 info->status.ampdu_len = ba_notif->txed;
1557 iwl_mvm_hwrate_to_tx_status(tid_data->rate_n_flags,
1558 info);
1559 /* TODO: not accounted if the whole A-MPDU failed */
1560 info->status.tx_time = tid_data->tx_time;
1561 info->status.status_driver_data[0] =
1562 (void *)(uintptr_t)ba_notif->reduced_txp;
1563 info->status.status_driver_data[1] =
1564 (void *)(uintptr_t)tid_data->rate_n_flags;
1565 }
1566
1567 void iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1568 {
1569 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1570 struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data;
1571 struct sk_buff_head reclaimed_skbs;
1572 struct iwl_mvm_tid_data *tid_data;
1573 struct ieee80211_sta *sta;
1574 struct iwl_mvm_sta *mvmsta;
1575 struct sk_buff *skb;
1576 int sta_id, tid, freed;
1577 /* "flow" corresponds to Tx queue */
1578 u16 scd_flow = le16_to_cpu(ba_notif->scd_flow);
1579 /* "ssn" is start of block-ack Tx window, corresponds to index
1580 * (in Tx queue's circular buffer) of first TFD/frame in window */
1581 u16 ba_resp_scd_ssn = le16_to_cpu(ba_notif->scd_ssn);
1582
1583 sta_id = ba_notif->sta_id;
1584 tid = ba_notif->tid;
1585
1586 if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT ||
1587 tid >= IWL_MAX_TID_COUNT,
1588 "sta_id %d tid %d", sta_id, tid))
1589 return;
1590
1591 rcu_read_lock();
1592
1593 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1594
1595 /* Reclaiming frames for a station that has been deleted ? */
1596 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
1597 rcu_read_unlock();
1598 return;
1599 }
1600
1601 mvmsta = iwl_mvm_sta_from_mac80211(sta);
1602 tid_data = &mvmsta->tid_data[tid];
1603
1604 if (tid_data->txq_id != scd_flow) {
1605 IWL_ERR(mvm,
1606 "invalid BA notification: Q %d, tid %d, flow %d\n",
1607 tid_data->txq_id, tid, scd_flow);
1608 rcu_read_unlock();
1609 return;
1610 }
1611
1612 spin_lock_bh(&mvmsta->lock);
1613
1614 __skb_queue_head_init(&reclaimed_skbs);
1615
1616 /*
1617 * Release all TFDs before the SSN, i.e. all TFDs in front of
1618 * block-ack window (we assume that they've been successfully
1619 * transmitted ... if not, it's too late anyway).
1620 */
1621 iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn,
1622 &reclaimed_skbs);
1623
1624 IWL_DEBUG_TX_REPLY(mvm,
1625 "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
1626 (u8 *)&ba_notif->sta_addr_lo32,
1627 ba_notif->sta_id);
1628 IWL_DEBUG_TX_REPLY(mvm,
1629 "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
1630 ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
1631 (unsigned long long)le64_to_cpu(ba_notif->bitmap),
1632 scd_flow, ba_resp_scd_ssn, ba_notif->txed,
1633 ba_notif->txed_2_done);
1634
1635 IWL_DEBUG_TX_REPLY(mvm, "reduced txp from ba notif %d\n",
1636 ba_notif->reduced_txp);
1637 tid_data->next_reclaimed = ba_resp_scd_ssn;
1638
1639 iwl_mvm_check_ratid_empty(mvm, sta, tid);
1640
1641 freed = 0;
1642
1643 skb_queue_walk(&reclaimed_skbs, skb) {
1644 struct ieee80211_hdr *hdr = (void *)skb->data;
1645 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1646
1647 if (ieee80211_is_data_qos(hdr->frame_control))
1648 freed++;
1649 else
1650 WARN_ON_ONCE(1);
1651
1652 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
1653
1654 memset(&info->status, 0, sizeof(info->status));
1655 /* Packet was transmitted successfully, failures come as single
1656 * frames because before failing a frame the firmware transmits
1657 * it without aggregation at least once.
1658 */
1659 info->flags |= IEEE80211_TX_STAT_ACK;
1660
1661 /* this is the first skb we deliver in this batch */
1662 /* put the rate scaling data there */
1663 if (freed == 1)
1664 iwl_mvm_tx_info_from_ba_notif(info, ba_notif, tid_data);
1665 }
1666
1667 spin_unlock_bh(&mvmsta->lock);
1668
1669 /* We got a BA notif with 0 acked or scd_ssn didn't progress which is
1670 * possible (i.e. first MPDU in the aggregation wasn't acked)
1671 * Still it's important to update RS about sent vs. acked.
1672 */
1673 if (skb_queue_empty(&reclaimed_skbs)) {
1674 struct ieee80211_tx_info ba_info = {};
1675 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
1676
1677 if (mvmsta->vif)
1678 chanctx_conf =
1679 rcu_dereference(mvmsta->vif->chanctx_conf);
1680
1681 if (WARN_ON_ONCE(!chanctx_conf))
1682 goto out;
1683
1684 ba_info.band = chanctx_conf->def.chan->band;
1685 iwl_mvm_tx_info_from_ba_notif(&ba_info, ba_notif, tid_data);
1686
1687 IWL_DEBUG_TX_REPLY(mvm, "No reclaim. Update rs directly\n");
1688 iwl_mvm_rs_tx_status(mvm, sta, tid, &ba_info, false);
1689 }
1690
1691 out:
1692 rcu_read_unlock();
1693
1694 while (!skb_queue_empty(&reclaimed_skbs)) {
1695 skb = __skb_dequeue(&reclaimed_skbs);
1696 ieee80211_tx_status(mvm->hw, skb);
1697 }
1698 }
1699
1700 /*
1701 * Note that there are transports that buffer frames before they reach
1702 * the firmware. This means that after flush_tx_path is called, the
1703 * queue might not be empty. The race-free way to handle this is to:
1704 * 1) set the station as draining
1705 * 2) flush the Tx path
1706 * 3) wait for the transport queues to be empty
1707 */
1708 int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, u32 flags)
1709 {
1710 int ret;
1711 struct iwl_tx_path_flush_cmd flush_cmd = {
1712 .queues_ctl = cpu_to_le32(tfd_msk),
1713 .flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
1714 };
1715
1716 ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags,
1717 sizeof(flush_cmd), &flush_cmd);
1718 if (ret)
1719 IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
1720 return ret;
1721 }
Linux kernel - Deliverables
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