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[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
71 #include "iwl-trans.h"
72 #include "iwl-eeprom-parse.h"
73 #include "mvm.h"
74 #include "sta.h"
75 #include "fw-dbg.h"
76
77 static void
78 iwl_mvm_bar_check_trigger(struct iwl_mvm *mvm, const u8 *addr,
79 u16 tid, u16 ssn)
80 {
81 struct iwl_fw_dbg_trigger_tlv *trig;
82 struct iwl_fw_dbg_trigger_ba *ba_trig;
83
84 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_BA))
85 return;
86
87 trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_BA);
88 ba_trig = (void *)trig->data;
89
90 if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
91 return;
92
93 if (!(le16_to_cpu(ba_trig->tx_bar) & BIT(tid)))
94 return;
95
96 iwl_mvm_fw_dbg_collect_trig(mvm, trig,
97 "BAR sent to %pM, tid %d, ssn %d",
98 addr, tid, ssn);
99 }
100
101 /*
102 * Sets most of the Tx cmd's fields
103 */
104 void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
105 struct iwl_tx_cmd *tx_cmd,
106 struct ieee80211_tx_info *info, u8 sta_id)
107 {
108 struct ieee80211_hdr *hdr = (void *)skb->data;
109 __le16 fc = hdr->frame_control;
110 u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags);
111 u32 len = skb->len + FCS_LEN;
112 u8 ac;
113
114 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
115 tx_flags |= TX_CMD_FLG_ACK;
116 else
117 tx_flags &= ~TX_CMD_FLG_ACK;
118
119 if (ieee80211_is_probe_resp(fc))
120 tx_flags |= TX_CMD_FLG_TSF;
121
122 if (ieee80211_has_morefrags(fc))
123 tx_flags |= TX_CMD_FLG_MORE_FRAG;
124
125 if (ieee80211_is_data_qos(fc)) {
126 u8 *qc = ieee80211_get_qos_ctl(hdr);
127 tx_cmd->tid_tspec = qc[0] & 0xf;
128 tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
129 } else if (ieee80211_is_back_req(fc)) {
130 struct ieee80211_bar *bar = (void *)skb->data;
131 u16 control = le16_to_cpu(bar->control);
132 u16 ssn = le16_to_cpu(bar->start_seq_num);
133
134 tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;
135 tx_cmd->tid_tspec = (control &
136 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
137 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
138 WARN_ON_ONCE(tx_cmd->tid_tspec >= IWL_MAX_TID_COUNT);
139 iwl_mvm_bar_check_trigger(mvm, bar->ra, tx_cmd->tid_tspec,
140 ssn);
141 } else {
142 tx_cmd->tid_tspec = IWL_TID_NON_QOS;
143 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
144 tx_flags |= TX_CMD_FLG_SEQ_CTL;
145 else
146 tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
147 }
148
149 /* Default to 0 (BE) when tid_spec is set to IWL_TID_NON_QOS */
150 if (tx_cmd->tid_tspec < IWL_MAX_TID_COUNT)
151 ac = tid_to_mac80211_ac[tx_cmd->tid_tspec];
152 else
153 ac = tid_to_mac80211_ac[0];
154
155 tx_flags |= iwl_mvm_bt_coex_tx_prio(mvm, hdr, info, ac) <<
156 TX_CMD_FLG_BT_PRIO_POS;
157
158 if (ieee80211_is_mgmt(fc)) {
159 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
160 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_ASSOC);
161 else if (ieee80211_is_action(fc))
162 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
163 else
164 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
165
166 /* The spec allows Action frames in A-MPDU, we don't support
167 * it
168 */
169 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
170 } else if (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
171 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
172 } else {
173 tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
174 }
175
176 if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
177 !is_multicast_ether_addr(ieee80211_get_DA(hdr)))
178 tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
179
180 if (fw_has_capa(&mvm->fw->ucode_capa,
181 IWL_UCODE_TLV_CAPA_TXPOWER_INSERTION_SUPPORT) &&
182 ieee80211_action_contains_tpc(skb))
183 tx_flags |= TX_CMD_FLG_WRITE_TX_POWER;
184
185 tx_cmd->tx_flags = cpu_to_le32(tx_flags);
186 /* Total # bytes to be transmitted */
187 tx_cmd->len = cpu_to_le16((u16)skb->len +
188 (uintptr_t)info->driver_data[0]);
189 tx_cmd->next_frame_len = 0;
190 tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
191 tx_cmd->sta_id = sta_id;
192 }
193
194 /*
195 * Sets the fields in the Tx cmd that are rate related
196 */
197 void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm, struct iwl_tx_cmd *tx_cmd,
198 struct ieee80211_tx_info *info,
199 struct ieee80211_sta *sta, __le16 fc)
200 {
201 u32 rate_flags;
202 int rate_idx;
203 u8 rate_plcp;
204
205 /* Set retry limit on RTS packets */
206 tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT;
207
208 /* Set retry limit on DATA packets and Probe Responses*/
209 if (ieee80211_is_probe_resp(fc)) {
210 tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT;
211 tx_cmd->rts_retry_limit =
212 min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit);
213 } else if (ieee80211_is_back_req(fc)) {
214 tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT;
215 } else {
216 tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY;
217 }
218
219 /*
220 * for data packets, rate info comes from the table inside the fw. This
221 * table is controlled by LINK_QUALITY commands
222 */
223
224 if (ieee80211_is_data(fc) && sta) {
225 tx_cmd->initial_rate_index = 0;
226 tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
227 return;
228 } else if (ieee80211_is_back_req(fc)) {
229 tx_cmd->tx_flags |=
230 cpu_to_le32(TX_CMD_FLG_ACK | TX_CMD_FLG_BAR);
231 }
232
233 /* HT rate doesn't make sense for a non data frame */
234 WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
235 "Got an HT rate (flags:0x%x/mcs:%d) for a non data frame (fc:0x%x)\n",
236 info->control.rates[0].flags,
237 info->control.rates[0].idx,
238 le16_to_cpu(fc));
239
240 rate_idx = info->control.rates[0].idx;
241 /* if the rate isn't a well known legacy rate, take the lowest one */
242 if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY)
243 rate_idx = rate_lowest_index(
244 &mvm->nvm_data->bands[info->band], sta);
245
246 /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
247 if (info->band == IEEE80211_BAND_5GHZ)
248 rate_idx += IWL_FIRST_OFDM_RATE;
249
250 /* For 2.4 GHZ band, check that there is no need to remap */
251 BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
252
253 /* Get PLCP rate for tx_cmd->rate_n_flags */
254 rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx);
255
256 mvm->mgmt_last_antenna_idx =
257 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
258 mvm->mgmt_last_antenna_idx);
259
260 if (info->band == IEEE80211_BAND_2GHZ &&
261 !iwl_mvm_bt_coex_is_shared_ant_avail(mvm))
262 rate_flags = mvm->cfg->non_shared_ant << RATE_MCS_ANT_POS;
263 else
264 rate_flags =
265 BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;
266
267 /* Set CCK flag as needed */
268 if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
269 rate_flags |= RATE_MCS_CCK_MSK;
270
271 /* Set the rate in the TX cmd */
272 tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags);
273 }
274
275 /*
276 * Sets the fields in the Tx cmd that are crypto related
277 */
278 static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
279 struct ieee80211_tx_info *info,
280 struct iwl_tx_cmd *tx_cmd,
281 struct sk_buff *skb_frag,
282 int hdrlen)
283 {
284 struct ieee80211_key_conf *keyconf = info->control.hw_key;
285 u8 *crypto_hdr = skb_frag->data + hdrlen;
286 u64 pn;
287
288 switch (keyconf->cipher) {
289 case WLAN_CIPHER_SUITE_CCMP:
290 case WLAN_CIPHER_SUITE_CCMP_256:
291 iwl_mvm_set_tx_cmd_ccmp(info, tx_cmd);
292 pn = atomic64_inc_return(&keyconf->tx_pn);
293 crypto_hdr[0] = pn;
294 crypto_hdr[2] = 0;
295 crypto_hdr[3] = 0x20 | (keyconf->keyidx << 6);
296 crypto_hdr[1] = pn >> 8;
297 crypto_hdr[4] = pn >> 16;
298 crypto_hdr[5] = pn >> 24;
299 crypto_hdr[6] = pn >> 32;
300 crypto_hdr[7] = pn >> 40;
301 break;
302
303 case WLAN_CIPHER_SUITE_TKIP:
304 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
305 pn = atomic64_inc_return(&keyconf->tx_pn);
306 ieee80211_tkip_add_iv(crypto_hdr, keyconf, pn);
307 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
308 break;
309
310 case WLAN_CIPHER_SUITE_WEP104:
311 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
312 /* fall through */
313 case WLAN_CIPHER_SUITE_WEP40:
314 tx_cmd->sec_ctl |= TX_CMD_SEC_WEP |
315 ((keyconf->keyidx << TX_CMD_SEC_WEP_KEY_IDX_POS) &
316 TX_CMD_SEC_WEP_KEY_IDX_MSK);
317
318 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
319 break;
320 default:
321 tx_cmd->sec_ctl |= TX_CMD_SEC_EXT;
322 }
323 }
324
325 /*
326 * Allocates and sets the Tx cmd the driver data pointers in the skb
327 */
328 static struct iwl_device_cmd *
329 iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
330 int hdrlen, struct ieee80211_sta *sta, u8 sta_id)
331 {
332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
333 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
334 struct iwl_device_cmd *dev_cmd;
335 struct iwl_tx_cmd *tx_cmd;
336
337 dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans);
338
339 if (unlikely(!dev_cmd))
340 return NULL;
341
342 memset(dev_cmd, 0, sizeof(*dev_cmd));
343 dev_cmd->hdr.cmd = TX_CMD;
344 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
345
346 if (info->control.hw_key)
347 iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb, hdrlen);
348
349 iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id);
350
351 iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);
352
353 memset(&info->status, 0, sizeof(info->status));
354 memset(info->driver_data, 0, sizeof(info->driver_data));
355
356 info->driver_data[1] = dev_cmd;
357
358 return dev_cmd;
359 }
360
361 int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
362 {
363 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
364 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
365 struct iwl_device_cmd *dev_cmd;
366 struct iwl_tx_cmd *tx_cmd;
367 u8 sta_id;
368 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
369
370 if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU))
371 return -1;
372
373 if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
374 (!info->control.vif ||
375 info->hw_queue != info->control.vif->cab_queue)))
376 return -1;
377
378 /* This holds the amsdu headers length */
379 info->driver_data[0] = (void *)(uintptr_t)0;
380
381 /*
382 * IWL_MVM_OFFCHANNEL_QUEUE is used for ROC packets that can be used
383 * in 2 different types of vifs, P2P & STATION. P2P uses the offchannel
384 * queue. STATION (HS2.0) uses the auxiliary context of the FW,
385 * and hence needs to be sent on the aux queue
386 */
387 if (IEEE80211_SKB_CB(skb)->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
388 info->control.vif->type == NL80211_IFTYPE_STATION)
389 IEEE80211_SKB_CB(skb)->hw_queue = mvm->aux_queue;
390
391 /*
392 * If the interface on which the frame is sent is the P2P_DEVICE
393 * or an AP/GO interface use the broadcast station associated
394 * with it; otherwise if the interface is a managed interface
395 * use the AP station associated with it for multicast traffic
396 * (this is not possible for unicast packets as a TLDS discovery
397 * response are sent without a station entry); otherwise use the
398 * AUX station.
399 */
400 sta_id = mvm->aux_sta.sta_id;
401 if (info->control.vif) {
402 struct iwl_mvm_vif *mvmvif =
403 iwl_mvm_vif_from_mac80211(info->control.vif);
404
405 if (info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
406 info->control.vif->type == NL80211_IFTYPE_AP)
407 sta_id = mvmvif->bcast_sta.sta_id;
408 else if (info->control.vif->type == NL80211_IFTYPE_STATION &&
409 is_multicast_ether_addr(hdr->addr1)) {
410 u8 ap_sta_id = ACCESS_ONCE(mvmvif->ap_sta_id);
411
412 if (ap_sta_id != IWL_MVM_STATION_COUNT)
413 sta_id = ap_sta_id;
414 }
415 }
416
417 IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, info->hw_queue);
418
419 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, hdrlen, NULL, sta_id);
420 if (!dev_cmd)
421 return -1;
422
423 /* From now on, we cannot access info->control */
424 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
425
426 /* Copy MAC header from skb into command buffer */
427 memcpy(tx_cmd->hdr, hdr, hdrlen);
428
429 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, info->hw_queue)) {
430 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
431 return -1;
432 }
433
434 /*
435 * Increase the pending frames counter, so that later when a reply comes
436 * in and the counter is decreased - we don't start getting negative
437 * values.
438 * Note that we don't need to make sure it isn't agg'd, since we're
439 * TXing non-sta
440 */
441 atomic_inc(&mvm->pending_frames[sta_id]);
442
443 return 0;
444 }
445
446 #ifdef CONFIG_INET
447 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
448 struct ieee80211_sta *sta,
449 struct sk_buff_head *mpdus_skb)
450 {
451 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
452 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
453 struct ieee80211_hdr *hdr = (void *)skb->data;
454 unsigned int mss = skb_shinfo(skb)->gso_size;
455 struct sk_buff *tmp, *next;
456 char cb[sizeof(skb->cb)];
457 unsigned int num_subframes, tcp_payload_len, subf_len, max_amsdu_len;
458 bool ipv4 = (skb->protocol == htons(ETH_P_IP));
459 u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0;
460 u16 amsdu_add, snap_ip_tcp, pad, i = 0;
461 unsigned int dbg_max_amsdu_len;
462 u8 *qc, tid, txf;
463
464 snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) +
465 tcp_hdrlen(skb);
466
467 qc = ieee80211_get_qos_ctl(hdr);
468 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
469 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
470 return -EINVAL;
471
472 if (!sta->max_amsdu_len ||
473 !ieee80211_is_data_qos(hdr->frame_control) ||
474 !mvmsta->tlc_amsdu) {
475 num_subframes = 1;
476 pad = 0;
477 goto segment;
478 }
479
480 /*
481 * No need to lock amsdu_in_ampdu_allowed since it can't be modified
482 * during an BA session.
483 */
484 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
485 !mvmsta->tid_data[tid].amsdu_in_ampdu_allowed) {
486 num_subframes = 1;
487 pad = 0;
488 goto segment;
489 }
490
491 max_amsdu_len = sta->max_amsdu_len;
492 dbg_max_amsdu_len = ACCESS_ONCE(mvm->max_amsdu_len);
493
494 /* the Tx FIFO to which this A-MSDU will be routed */
495 txf = iwl_mvm_ac_to_tx_fifo[tid_to_mac80211_ac[tid]];
496
497 /*
498 * Don't send an AMSDU that will be longer than the TXF.
499 * Add a security margin of 256 for the TX command + headers.
500 * We also want to have the start of the next packet inside the
501 * fifo to be able to send bursts.
502 */
503 max_amsdu_len = min_t(unsigned int, max_amsdu_len,
504 mvm->shared_mem_cfg.txfifo_size[txf] - 256);
505
506 if (dbg_max_amsdu_len)
507 max_amsdu_len = min_t(unsigned int, max_amsdu_len,
508 dbg_max_amsdu_len);
509
510 /*
511 * Limit A-MSDU in A-MPDU to 4095 bytes when VHT is not
512 * supported. This is a spec requirement (IEEE 802.11-2015
513 * section 8.7.3 NOTE 3).
514 */
515 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
516 !sta->vht_cap.vht_supported)
517 max_amsdu_len = min_t(unsigned int, max_amsdu_len, 4095);
518
519 /* Sub frame header + SNAP + IP header + TCP header + MSS */
520 subf_len = sizeof(struct ethhdr) + snap_ip_tcp + mss;
521 pad = (4 - subf_len) & 0x3;
522
523 /*
524 * If we have N subframes in the A-MSDU, then the A-MSDU's size is
525 * N * subf_len + (N - 1) * pad.
526 */
527 num_subframes = (max_amsdu_len + pad) / (subf_len + pad);
528 if (num_subframes > 1)
529 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
530
531 tcp_payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
532 tcp_hdrlen(skb) + skb->data_len;
533
534 /*
535 * Make sure we have enough TBs for the A-MSDU:
536 * 2 for each subframe
537 * 1 more for each fragment
538 * 1 more for the potential data in the header
539 */
540 num_subframes =
541 min_t(unsigned int, num_subframes,
542 (mvm->trans->max_skb_frags - 1 -
543 skb_shinfo(skb)->nr_frags) / 2);
544
545 /* This skb fits in one single A-MSDU */
546 if (num_subframes * mss >= tcp_payload_len) {
547 /*
548 * Compute the length of all the data added for the A-MSDU.
549 * This will be used to compute the length to write in the TX
550 * command. We have: SNAP + IP + TCP for n -1 subframes and
551 * ETH header for n subframes. Note that the original skb
552 * already had one set of SNAP / IP / TCP headers.
553 */
554 num_subframes = DIV_ROUND_UP(tcp_payload_len, mss);
555 info = IEEE80211_SKB_CB(skb);
556 amsdu_add = num_subframes * sizeof(struct ethhdr) +
557 (num_subframes - 1) * (snap_ip_tcp + pad);
558 /* This holds the amsdu headers length */
559 info->driver_data[0] = (void *)(uintptr_t)amsdu_add;
560
561 __skb_queue_tail(mpdus_skb, skb);
562 return 0;
563 }
564
565 /*
566 * Trick the segmentation function to make it
567 * create SKBs that can fit into one A-MSDU.
568 */
569 segment:
570 skb_shinfo(skb)->gso_size = num_subframes * mss;
571 memcpy(cb, skb->cb, sizeof(cb));
572
573 next = skb_gso_segment(skb, NETIF_F_CSUM_MASK | NETIF_F_SG);
574 skb_shinfo(skb)->gso_size = mss;
575 if (WARN_ON_ONCE(IS_ERR(next)))
576 return -EINVAL;
577 else if (next)
578 consume_skb(skb);
579
580 while (next) {
581 tmp = next;
582 next = tmp->next;
583
584 memcpy(tmp->cb, cb, sizeof(tmp->cb));
585 /*
586 * Compute the length of all the data added for the A-MSDU.
587 * This will be used to compute the length to write in the TX
588 * command. We have: SNAP + IP + TCP for n -1 subframes and
589 * ETH header for n subframes.
590 */
591 tcp_payload_len = skb_tail_pointer(tmp) -
592 skb_transport_header(tmp) -
593 tcp_hdrlen(tmp) + tmp->data_len;
594
595 if (ipv4)
596 ip_hdr(tmp)->id = htons(ip_base_id + i * num_subframes);
597
598 if (tcp_payload_len > mss) {
599 num_subframes = DIV_ROUND_UP(tcp_payload_len, mss);
600 info = IEEE80211_SKB_CB(tmp);
601 amsdu_add = num_subframes * sizeof(struct ethhdr) +
602 (num_subframes - 1) * (snap_ip_tcp + pad);
603 info->driver_data[0] = (void *)(uintptr_t)amsdu_add;
604 skb_shinfo(tmp)->gso_size = mss;
605 } else {
606 qc = ieee80211_get_qos_ctl((void *)tmp->data);
607
608 if (ipv4)
609 ip_send_check(ip_hdr(tmp));
610 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
611 skb_shinfo(tmp)->gso_size = 0;
612 }
613
614 tmp->prev = NULL;
615 tmp->next = NULL;
616
617 __skb_queue_tail(mpdus_skb, tmp);
618 i++;
619 }
620
621 return 0;
622 }
623 #else /* CONFIG_INET */
624 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
625 struct ieee80211_sta *sta,
626 struct sk_buff_head *mpdus_skb)
627 {
628 /* Impossible to get TSO with CONFIG_INET */
629 WARN_ON(1);
630
631 return -1;
632 }
633 #endif
634
635 /*
636 * Sets the fields in the Tx cmd that are crypto related
637 */
638 static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
639 struct ieee80211_sta *sta)
640 {
641 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
642 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
643 struct iwl_mvm_sta *mvmsta;
644 struct iwl_device_cmd *dev_cmd;
645 struct iwl_tx_cmd *tx_cmd;
646 __le16 fc;
647 u16 seq_number = 0;
648 u8 tid = IWL_MAX_TID_COUNT;
649 u8 txq_id = info->hw_queue;
650 bool is_data_qos = false, is_ampdu = false;
651 int hdrlen;
652
653 mvmsta = iwl_mvm_sta_from_mac80211(sta);
654 fc = hdr->frame_control;
655 hdrlen = ieee80211_hdrlen(fc);
656
657 if (WARN_ON_ONCE(!mvmsta))
658 return -1;
659
660 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
661 return -1;
662
663 dev_cmd = iwl_mvm_set_tx_params(mvm, skb, hdrlen, sta, mvmsta->sta_id);
664 if (!dev_cmd)
665 goto drop;
666
667 tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
668 /* From now on, we cannot access info->control */
669
670 /*
671 * we handle that entirely ourselves -- for uAPSD the firmware
672 * will always send a notification, and for PS-Poll responses
673 * we'll notify mac80211 when getting frame status
674 */
675 info->flags &= ~IEEE80211_TX_STATUS_EOSP;
676
677 spin_lock(&mvmsta->lock);
678
679 if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
680 u8 *qc = NULL;
681 qc = ieee80211_get_qos_ctl(hdr);
682 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
683 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
684 goto drop_unlock_sta;
685
686 seq_number = mvmsta->tid_data[tid].seq_number;
687 seq_number &= IEEE80211_SCTL_SEQ;
688 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
689 hdr->seq_ctrl |= cpu_to_le16(seq_number);
690 is_data_qos = true;
691 is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
692 }
693
694 /* Copy MAC header from skb into command buffer */
695 memcpy(tx_cmd->hdr, hdr, hdrlen);
696
697 WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
698
699 if (sta->tdls) {
700 /* default to TID 0 for non-QoS packets */
701 u8 tdls_tid = tid == IWL_MAX_TID_COUNT ? 0 : tid;
702
703 txq_id = mvmsta->hw_queue[tid_to_mac80211_ac[tdls_tid]];
704 }
705
706 if (is_ampdu) {
707 if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON))
708 goto drop_unlock_sta;
709 txq_id = mvmsta->tid_data[tid].txq_id;
710 }
711
712 IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
713 tid, txq_id, IEEE80211_SEQ_TO_SN(seq_number));
714
715 if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
716 goto drop_unlock_sta;
717
718 if (is_data_qos && !ieee80211_has_morefrags(fc))
719 mvmsta->tid_data[tid].seq_number = seq_number + 0x10;
720
721 spin_unlock(&mvmsta->lock);
722
723 if (txq_id < mvm->first_agg_queue)
724 atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);
725
726 return 0;
727
728 drop_unlock_sta:
729 iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
730 spin_unlock(&mvmsta->lock);
731 drop:
732 return -1;
733 }
734
735 int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
736 struct ieee80211_sta *sta)
737 {
738 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
739 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
740 struct sk_buff_head mpdus_skbs;
741 unsigned int payload_len;
742 int ret;
743
744 if (WARN_ON_ONCE(!mvmsta))
745 return -1;
746
747 if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
748 return -1;
749
750 /* This holds the amsdu headers length */
751 info->driver_data[0] = (void *)(uintptr_t)0;
752
753 if (!skb_is_gso(skb))
754 return iwl_mvm_tx_mpdu(mvm, skb, sta);
755
756 payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
757 tcp_hdrlen(skb) + skb->data_len;
758
759 if (payload_len <= skb_shinfo(skb)->gso_size)
760 return iwl_mvm_tx_mpdu(mvm, skb, sta);
761
762 __skb_queue_head_init(&mpdus_skbs);
763
764 ret = iwl_mvm_tx_tso(mvm, skb, sta, &mpdus_skbs);
765 if (ret)
766 return ret;
767
768 if (WARN_ON(skb_queue_empty(&mpdus_skbs)))
769 return ret;
770
771 while (!skb_queue_empty(&mpdus_skbs)) {
772 skb = __skb_dequeue(&mpdus_skbs);
773
774 ret = iwl_mvm_tx_mpdu(mvm, skb, sta);
775 if (ret) {
776 __skb_queue_purge(&mpdus_skbs);
777 return ret;
778 }
779 }
780
781 return 0;
782 }
783
784 static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
785 struct ieee80211_sta *sta, u8 tid)
786 {
787 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
788 struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
789 struct ieee80211_vif *vif = mvmsta->vif;
790
791 lockdep_assert_held(&mvmsta->lock);
792
793 if ((tid_data->state == IWL_AGG_ON ||
794 tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) &&
795 iwl_mvm_tid_queued(tid_data) == 0) {
796 /*
797 * Now that this aggregation queue is empty tell mac80211 so it
798 * knows we no longer have frames buffered for the station on
799 * this TID (for the TIM bitmap calculation.)
800 */
801 ieee80211_sta_set_buffered(sta, tid, false);
802 }
803
804 if (tid_data->ssn != tid_data->next_reclaimed)
805 return;
806
807 switch (tid_data->state) {
808 case IWL_EMPTYING_HW_QUEUE_ADDBA:
809 IWL_DEBUG_TX_QUEUES(mvm,
810 "Can continue addBA flow ssn = next_recl = %d\n",
811 tid_data->next_reclaimed);
812 tid_data->state = IWL_AGG_STARTING;
813 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
814 break;
815
816 case IWL_EMPTYING_HW_QUEUE_DELBA:
817 IWL_DEBUG_TX_QUEUES(mvm,
818 "Can continue DELBA flow ssn = next_recl = %d\n",
819 tid_data->next_reclaimed);
820 iwl_mvm_disable_txq(mvm, tid_data->txq_id,
821 vif->hw_queue[tid_to_mac80211_ac[tid]], tid,
822 CMD_ASYNC);
823 tid_data->state = IWL_AGG_OFF;
824 ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
825 break;
826
827 default:
828 break;
829 }
830 }
831
832 #ifdef CONFIG_IWLWIFI_DEBUG
833 const char *iwl_mvm_get_tx_fail_reason(u32 status)
834 {
835 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
836 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
837
838 switch (status & TX_STATUS_MSK) {
839 case TX_STATUS_SUCCESS:
840 return "SUCCESS";
841 TX_STATUS_POSTPONE(DELAY);
842 TX_STATUS_POSTPONE(FEW_BYTES);
843 TX_STATUS_POSTPONE(BT_PRIO);
844 TX_STATUS_POSTPONE(QUIET_PERIOD);
845 TX_STATUS_POSTPONE(CALC_TTAK);
846 TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
847 TX_STATUS_FAIL(SHORT_LIMIT);
848 TX_STATUS_FAIL(LONG_LIMIT);
849 TX_STATUS_FAIL(UNDERRUN);
850 TX_STATUS_FAIL(DRAIN_FLOW);
851 TX_STATUS_FAIL(RFKILL_FLUSH);
852 TX_STATUS_FAIL(LIFE_EXPIRE);
853 TX_STATUS_FAIL(DEST_PS);
854 TX_STATUS_FAIL(HOST_ABORTED);
855 TX_STATUS_FAIL(BT_RETRY);
856 TX_STATUS_FAIL(STA_INVALID);
857 TX_STATUS_FAIL(FRAG_DROPPED);
858 TX_STATUS_FAIL(TID_DISABLE);
859 TX_STATUS_FAIL(FIFO_FLUSHED);
860 TX_STATUS_FAIL(SMALL_CF_POLL);
861 TX_STATUS_FAIL(FW_DROP);
862 TX_STATUS_FAIL(STA_COLOR_MISMATCH);
863 }
864
865 return "UNKNOWN";
866
867 #undef TX_STATUS_FAIL
868 #undef TX_STATUS_POSTPONE
869 }
870 #endif /* CONFIG_IWLWIFI_DEBUG */
871
872 void iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,
873 enum ieee80211_band band,
874 struct ieee80211_tx_rate *r)
875 {
876 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
877 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
878 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
879 case RATE_MCS_CHAN_WIDTH_20:
880 break;
881 case RATE_MCS_CHAN_WIDTH_40:
882 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
883 break;
884 case RATE_MCS_CHAN_WIDTH_80:
885 r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
886 break;
887 case RATE_MCS_CHAN_WIDTH_160:
888 r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
889 break;
890 }
891 if (rate_n_flags & RATE_MCS_SGI_MSK)
892 r->flags |= IEEE80211_TX_RC_SHORT_GI;
893 if (rate_n_flags & RATE_MCS_HT_MSK) {
894 r->flags |= IEEE80211_TX_RC_MCS;
895 r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
896 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
897 ieee80211_rate_set_vht(
898 r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
899 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
900 RATE_VHT_MCS_NSS_POS) + 1);
901 r->flags |= IEEE80211_TX_RC_VHT_MCS;
902 } else {
903 r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
904 band);
905 }
906 }
907
908 /**
909 * translate ucode response to mac80211 tx status control values
910 */
911 static void iwl_mvm_hwrate_to_tx_status(u32 rate_n_flags,
912 struct ieee80211_tx_info *info)
913 {
914 struct ieee80211_tx_rate *r = &info->status.rates[0];
915
916 info->status.antenna =
917 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
918 iwl_mvm_hwrate_to_tx_rate(rate_n_flags, info->band, r);
919 }
920
921 static void iwl_mvm_tx_status_check_trigger(struct iwl_mvm *mvm,
922 u32 status)
923 {
924 struct iwl_fw_dbg_trigger_tlv *trig;
925 struct iwl_fw_dbg_trigger_tx_status *status_trig;
926 int i;
927
928 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TX_STATUS))
929 return;
930
931 trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TX_STATUS);
932 status_trig = (void *)trig->data;
933
934 if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
935 return;
936
937 for (i = 0; i < ARRAY_SIZE(status_trig->statuses); i++) {
938 /* don't collect on status 0 */
939 if (!status_trig->statuses[i].status)
940 break;
941
942 if (status_trig->statuses[i].status != (status & TX_STATUS_MSK))
943 continue;
944
945 iwl_mvm_fw_dbg_collect_trig(mvm, trig,
946 "Tx status %d was received",
947 status & TX_STATUS_MSK);
948 break;
949 }
950 }
951
952 static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
953 struct iwl_rx_packet *pkt)
954 {
955 struct ieee80211_sta *sta;
956 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
957 int txq_id = SEQ_TO_QUEUE(sequence);
958 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
959 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
960 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
961 u32 status = le16_to_cpu(tx_resp->status.status);
962 u16 ssn = iwl_mvm_get_scd_ssn(tx_resp);
963 struct iwl_mvm_sta *mvmsta;
964 struct sk_buff_head skbs;
965 u8 skb_freed = 0;
966 u16 next_reclaimed, seq_ctl;
967 bool is_ndp = false;
968
969 __skb_queue_head_init(&skbs);
970
971 seq_ctl = le16_to_cpu(tx_resp->seq_ctl);
972
973 /* we can free until ssn % q.n_bd not inclusive */
974 iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);
975
976 while (!skb_queue_empty(&skbs)) {
977 struct sk_buff *skb = __skb_dequeue(&skbs);
978 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
979
980 skb_freed++;
981
982 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
983
984 memset(&info->status, 0, sizeof(info->status));
985
986 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
987
988 /* inform mac80211 about what happened with the frame */
989 switch (status & TX_STATUS_MSK) {
990 case TX_STATUS_SUCCESS:
991 case TX_STATUS_DIRECT_DONE:
992 info->flags |= IEEE80211_TX_STAT_ACK;
993 break;
994 case TX_STATUS_FAIL_DEST_PS:
995 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
996 break;
997 default:
998 break;
999 }
1000
1001 iwl_mvm_tx_status_check_trigger(mvm, status);
1002
1003 info->status.rates[0].count = tx_resp->failure_frame + 1;
1004 iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate),
1005 info);
1006 info->status.status_driver_data[1] =
1007 (void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate);
1008
1009 /* Single frame failure in an AMPDU queue => send BAR */
1010 if (txq_id >= mvm->first_agg_queue &&
1011 !(info->flags & IEEE80211_TX_STAT_ACK) &&
1012 !(info->flags & IEEE80211_TX_STAT_TX_FILTERED))
1013 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1014
1015 /* W/A FW bug: seq_ctl is wrong when the status isn't success */
1016 if (status != TX_STATUS_SUCCESS) {
1017 struct ieee80211_hdr *hdr = (void *)skb->data;
1018 seq_ctl = le16_to_cpu(hdr->seq_ctrl);
1019 }
1020
1021 if (unlikely(!seq_ctl)) {
1022 struct ieee80211_hdr *hdr = (void *)skb->data;
1023
1024 /*
1025 * If it is an NDP, we can't update next_reclaim since
1026 * its sequence control is 0. Note that for that same
1027 * reason, NDPs are never sent to A-MPDU'able queues
1028 * so that we can never have more than one freed frame
1029 * for a single Tx resonse (see WARN_ON below).
1030 */
1031 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1032 is_ndp = true;
1033 }
1034
1035 /*
1036 * TODO: this is not accurate if we are freeing more than one
1037 * packet.
1038 */
1039 info->status.tx_time =
1040 le16_to_cpu(tx_resp->wireless_media_time);
1041 BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
1042 info->status.status_driver_data[0] =
1043 (void *)(uintptr_t)tx_resp->reduced_tpc;
1044
1045 ieee80211_tx_status(mvm->hw, skb);
1046 }
1047
1048 if (txq_id >= mvm->first_agg_queue) {
1049 /* If this is an aggregation queue, we use the ssn since:
1050 * ssn = wifi seq_num % 256.
1051 * The seq_ctl is the sequence control of the packet to which
1052 * this Tx response relates. But if there is a hole in the
1053 * bitmap of the BA we received, this Tx response may allow to
1054 * reclaim the hole and all the subsequent packets that were
1055 * already acked. In that case, seq_ctl != ssn, and the next
1056 * packet to be reclaimed will be ssn and not seq_ctl. In that
1057 * case, several packets will be reclaimed even if
1058 * frame_count = 1.
1059 *
1060 * The ssn is the index (% 256) of the latest packet that has
1061 * treated (acked / dropped) + 1.
1062 */
1063 next_reclaimed = ssn;
1064 } else {
1065 /* The next packet to be reclaimed is the one after this one */
1066 next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
1067 }
1068
1069 IWL_DEBUG_TX_REPLY(mvm,
1070 "TXQ %d status %s (0x%08x)\n",
1071 txq_id, iwl_mvm_get_tx_fail_reason(status), status);
1072
1073 IWL_DEBUG_TX_REPLY(mvm,
1074 "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
1075 le32_to_cpu(tx_resp->initial_rate),
1076 tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
1077 ssn, next_reclaimed, seq_ctl);
1078
1079 rcu_read_lock();
1080
1081 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1082 /*
1083 * sta can't be NULL otherwise it'd mean that the sta has been freed in
1084 * the firmware while we still have packets for it in the Tx queues.
1085 */
1086 if (WARN_ON_ONCE(!sta))
1087 goto out;
1088
1089 if (!IS_ERR(sta)) {
1090 mvmsta = iwl_mvm_sta_from_mac80211(sta);
1091
1092 if (tid != IWL_TID_NON_QOS) {
1093 struct iwl_mvm_tid_data *tid_data =
1094 &mvmsta->tid_data[tid];
1095 bool send_eosp_ndp = false;
1096
1097 spin_lock_bh(&mvmsta->lock);
1098 if (!is_ndp) {
1099 tid_data->next_reclaimed = next_reclaimed;
1100 IWL_DEBUG_TX_REPLY(mvm,
1101 "Next reclaimed packet:%d\n",
1102 next_reclaimed);
1103 } else {
1104 IWL_DEBUG_TX_REPLY(mvm,
1105 "NDP - don't update next_reclaimed\n");
1106 }
1107
1108 iwl_mvm_check_ratid_empty(mvm, sta, tid);
1109
1110 if (mvmsta->sleep_tx_count) {
1111 mvmsta->sleep_tx_count--;
1112 if (mvmsta->sleep_tx_count &&
1113 !iwl_mvm_tid_queued(tid_data)) {
1114 /*
1115 * The number of frames in the queue
1116 * dropped to 0 even if we sent less
1117 * frames than we thought we had on the
1118 * Tx queue.
1119 * This means we had holes in the BA
1120 * window that we just filled, ask
1121 * mac80211 to send EOSP since the
1122 * firmware won't know how to do that.
1123 * Send NDP and the firmware will send
1124 * EOSP notification that will trigger
1125 * a call to ieee80211_sta_eosp().
1126 */
1127 send_eosp_ndp = true;
1128 }
1129 }
1130
1131 spin_unlock_bh(&mvmsta->lock);
1132 if (send_eosp_ndp) {
1133 iwl_mvm_sta_modify_sleep_tx_count(mvm, sta,
1134 IEEE80211_FRAME_RELEASE_UAPSD,
1135 1, tid, false, false);
1136 mvmsta->sleep_tx_count = 0;
1137 ieee80211_send_eosp_nullfunc(sta, tid);
1138 }
1139 }
1140
1141 if (mvmsta->next_status_eosp) {
1142 mvmsta->next_status_eosp = false;
1143 ieee80211_sta_eosp(sta);
1144 }
1145 } else {
1146 mvmsta = NULL;
1147 }
1148
1149 /*
1150 * If the txq is not an AMPDU queue, there is no chance we freed
1151 * several skbs. Check that out...
1152 */
1153 if (txq_id >= mvm->first_agg_queue)
1154 goto out;
1155
1156 /* We can't free more than one frame at once on a shared queue */
1157 WARN_ON(skb_freed > 1);
1158
1159 /* If we have still frames for this STA nothing to do here */
1160 if (!atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id]))
1161 goto out;
1162
1163 if (mvmsta && mvmsta->vif->type == NL80211_IFTYPE_AP) {
1164
1165 /*
1166 * If there are no pending frames for this STA and
1167 * the tx to this station is not disabled, notify
1168 * mac80211 that this station can now wake up in its
1169 * STA table.
1170 * If mvmsta is not NULL, sta is valid.
1171 */
1172
1173 spin_lock_bh(&mvmsta->lock);
1174
1175 if (!mvmsta->disable_tx)
1176 ieee80211_sta_block_awake(mvm->hw, sta, false);
1177
1178 spin_unlock_bh(&mvmsta->lock);
1179 }
1180
1181 if (PTR_ERR(sta) == -EBUSY || PTR_ERR(sta) == -ENOENT) {
1182 /*
1183 * We are draining and this was the last packet - pre_rcu_remove
1184 * has been called already. We might be after the
1185 * synchronize_net already.
1186 * Don't rely on iwl_mvm_rm_sta to see the empty Tx queues.
1187 */
1188 set_bit(sta_id, mvm->sta_drained);
1189 schedule_work(&mvm->sta_drained_wk);
1190 }
1191
1192 out:
1193 rcu_read_unlock();
1194 }
1195
1196 #ifdef CONFIG_IWLWIFI_DEBUG
1197 #define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
1198 static const char *iwl_get_agg_tx_status(u16 status)
1199 {
1200 switch (status & AGG_TX_STATE_STATUS_MSK) {
1201 AGG_TX_STATE_(TRANSMITTED);
1202 AGG_TX_STATE_(UNDERRUN);
1203 AGG_TX_STATE_(BT_PRIO);
1204 AGG_TX_STATE_(FEW_BYTES);
1205 AGG_TX_STATE_(ABORT);
1206 AGG_TX_STATE_(LAST_SENT_TTL);
1207 AGG_TX_STATE_(LAST_SENT_TRY_CNT);
1208 AGG_TX_STATE_(LAST_SENT_BT_KILL);
1209 AGG_TX_STATE_(SCD_QUERY);
1210 AGG_TX_STATE_(TEST_BAD_CRC32);
1211 AGG_TX_STATE_(RESPONSE);
1212 AGG_TX_STATE_(DUMP_TX);
1213 AGG_TX_STATE_(DELAY_TX);
1214 }
1215
1216 return "UNKNOWN";
1217 }
1218
1219 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
1220 struct iwl_rx_packet *pkt)
1221 {
1222 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1223 struct agg_tx_status *frame_status = &tx_resp->status;
1224 int i;
1225
1226 for (i = 0; i < tx_resp->frame_count; i++) {
1227 u16 fstatus = le16_to_cpu(frame_status[i].status);
1228
1229 IWL_DEBUG_TX_REPLY(mvm,
1230 "status %s (0x%04x), try-count (%d) seq (0x%x)\n",
1231 iwl_get_agg_tx_status(fstatus),
1232 fstatus & AGG_TX_STATE_STATUS_MSK,
1233 (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
1234 AGG_TX_STATE_TRY_CNT_POS,
1235 le16_to_cpu(frame_status[i].sequence));
1236 }
1237 }
1238 #else
1239 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
1240 struct iwl_rx_packet *pkt)
1241 {}
1242 #endif /* CONFIG_IWLWIFI_DEBUG */
1243
1244 static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
1245 struct iwl_rx_packet *pkt)
1246 {
1247 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1248 int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
1249 int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
1250 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1251 struct ieee80211_sta *sta;
1252
1253 if (WARN_ON_ONCE(SEQ_TO_QUEUE(sequence) < mvm->first_agg_queue))
1254 return;
1255
1256 if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
1257 return;
1258
1259 iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);
1260
1261 rcu_read_lock();
1262
1263 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1264
1265 if (!WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
1266 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1267 mvmsta->tid_data[tid].rate_n_flags =
1268 le32_to_cpu(tx_resp->initial_rate);
1269 mvmsta->tid_data[tid].tx_time =
1270 le16_to_cpu(tx_resp->wireless_media_time);
1271 }
1272
1273 rcu_read_unlock();
1274 }
1275
1276 void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1277 {
1278 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1279 struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1280
1281 if (tx_resp->frame_count == 1)
1282 iwl_mvm_rx_tx_cmd_single(mvm, pkt);
1283 else
1284 iwl_mvm_rx_tx_cmd_agg(mvm, pkt);
1285 }
1286
1287 static void iwl_mvm_tx_info_from_ba_notif(struct ieee80211_tx_info *info,
1288 struct iwl_mvm_ba_notif *ba_notif,
1289 struct iwl_mvm_tid_data *tid_data)
1290 {
1291 info->flags |= IEEE80211_TX_STAT_AMPDU;
1292 info->status.ampdu_ack_len = ba_notif->txed_2_done;
1293 info->status.ampdu_len = ba_notif->txed;
1294 iwl_mvm_hwrate_to_tx_status(tid_data->rate_n_flags,
1295 info);
1296 /* TODO: not accounted if the whole A-MPDU failed */
1297 info->status.tx_time = tid_data->tx_time;
1298 info->status.status_driver_data[0] =
1299 (void *)(uintptr_t)ba_notif->reduced_txp;
1300 info->status.status_driver_data[1] =
1301 (void *)(uintptr_t)tid_data->rate_n_flags;
1302 }
1303
1304 void iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1305 {
1306 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1307 struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data;
1308 struct sk_buff_head reclaimed_skbs;
1309 struct iwl_mvm_tid_data *tid_data;
1310 struct ieee80211_sta *sta;
1311 struct iwl_mvm_sta *mvmsta;
1312 struct sk_buff *skb;
1313 int sta_id, tid, freed;
1314 /* "flow" corresponds to Tx queue */
1315 u16 scd_flow = le16_to_cpu(ba_notif->scd_flow);
1316 /* "ssn" is start of block-ack Tx window, corresponds to index
1317 * (in Tx queue's circular buffer) of first TFD/frame in window */
1318 u16 ba_resp_scd_ssn = le16_to_cpu(ba_notif->scd_ssn);
1319
1320 sta_id = ba_notif->sta_id;
1321 tid = ba_notif->tid;
1322
1323 if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT ||
1324 tid >= IWL_MAX_TID_COUNT,
1325 "sta_id %d tid %d", sta_id, tid))
1326 return;
1327
1328 rcu_read_lock();
1329
1330 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1331
1332 /* Reclaiming frames for a station that has been deleted ? */
1333 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
1334 rcu_read_unlock();
1335 return;
1336 }
1337
1338 mvmsta = iwl_mvm_sta_from_mac80211(sta);
1339 tid_data = &mvmsta->tid_data[tid];
1340
1341 if (tid_data->txq_id != scd_flow) {
1342 IWL_ERR(mvm,
1343 "invalid BA notification: Q %d, tid %d, flow %d\n",
1344 tid_data->txq_id, tid, scd_flow);
1345 rcu_read_unlock();
1346 return;
1347 }
1348
1349 spin_lock_bh(&mvmsta->lock);
1350
1351 __skb_queue_head_init(&reclaimed_skbs);
1352
1353 /*
1354 * Release all TFDs before the SSN, i.e. all TFDs in front of
1355 * block-ack window (we assume that they've been successfully
1356 * transmitted ... if not, it's too late anyway).
1357 */
1358 iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn,
1359 &reclaimed_skbs);
1360
1361 IWL_DEBUG_TX_REPLY(mvm,
1362 "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
1363 (u8 *)&ba_notif->sta_addr_lo32,
1364 ba_notif->sta_id);
1365 IWL_DEBUG_TX_REPLY(mvm,
1366 "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
1367 ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
1368 (unsigned long long)le64_to_cpu(ba_notif->bitmap),
1369 scd_flow, ba_resp_scd_ssn, ba_notif->txed,
1370 ba_notif->txed_2_done);
1371
1372 IWL_DEBUG_TX_REPLY(mvm, "reduced txp from ba notif %d\n",
1373 ba_notif->reduced_txp);
1374 tid_data->next_reclaimed = ba_resp_scd_ssn;
1375
1376 iwl_mvm_check_ratid_empty(mvm, sta, tid);
1377
1378 freed = 0;
1379
1380 skb_queue_walk(&reclaimed_skbs, skb) {
1381 struct ieee80211_hdr *hdr = (void *)skb->data;
1382 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1383
1384 if (ieee80211_is_data_qos(hdr->frame_control))
1385 freed++;
1386 else
1387 WARN_ON_ONCE(1);
1388
1389 iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
1390
1391 memset(&info->status, 0, sizeof(info->status));
1392 /* Packet was transmitted successfully, failures come as single
1393 * frames because before failing a frame the firmware transmits
1394 * it without aggregation at least once.
1395 */
1396 info->flags |= IEEE80211_TX_STAT_ACK;
1397
1398 /* this is the first skb we deliver in this batch */
1399 /* put the rate scaling data there */
1400 if (freed == 1)
1401 iwl_mvm_tx_info_from_ba_notif(info, ba_notif, tid_data);
1402 }
1403
1404 spin_unlock_bh(&mvmsta->lock);
1405
1406 /* We got a BA notif with 0 acked or scd_ssn didn't progress which is
1407 * possible (i.e. first MPDU in the aggregation wasn't acked)
1408 * Still it's important to update RS about sent vs. acked.
1409 */
1410 if (skb_queue_empty(&reclaimed_skbs)) {
1411 struct ieee80211_tx_info ba_info = {};
1412 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
1413
1414 if (mvmsta->vif)
1415 chanctx_conf =
1416 rcu_dereference(mvmsta->vif->chanctx_conf);
1417
1418 if (WARN_ON_ONCE(!chanctx_conf))
1419 goto out;
1420
1421 ba_info.band = chanctx_conf->def.chan->band;
1422 iwl_mvm_tx_info_from_ba_notif(&ba_info, ba_notif, tid_data);
1423
1424 IWL_DEBUG_TX_REPLY(mvm, "No reclaim. Update rs directly\n");
1425 iwl_mvm_rs_tx_status(mvm, sta, tid, &ba_info);
1426 }
1427
1428 out:
1429 rcu_read_unlock();
1430
1431 while (!skb_queue_empty(&reclaimed_skbs)) {
1432 skb = __skb_dequeue(&reclaimed_skbs);
1433 ieee80211_tx_status(mvm->hw, skb);
1434 }
1435 }
1436
1437 /*
1438 * Note that there are transports that buffer frames before they reach
1439 * the firmware. This means that after flush_tx_path is called, the
1440 * queue might not be empty. The race-free way to handle this is to:
1441 * 1) set the station as draining
1442 * 2) flush the Tx path
1443 * 3) wait for the transport queues to be empty
1444 */
1445 int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, u32 flags)
1446 {
1447 int ret;
1448 struct iwl_tx_path_flush_cmd flush_cmd = {
1449 .queues_ctl = cpu_to_le32(tfd_msk),
1450 .flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
1451 };
1452
1453 ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags,
1454 sizeof(flush_cmd), &flush_cmd);
1455 if (ret)
1456 IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
1457 return ret;
1458 }
Linux kernel - Deliverables
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