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[mirror_ubuntu-focal-kernel.git] / drivers / net / wireless / intel / iwlwifi / mvm / rxmq.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) 2015 - 2017 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 * The full GNU General Public License is included in this distribution
22 * in the file called COPYING.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *
28 * BSD LICENSE
29 *
30 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
31 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
32 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
33 * All rights reserved.
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 *
39 * * Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * * Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in
43 * the documentation and/or other materials provided with the
44 * distribution.
45 * * Neither the name Intel Corporation nor the names of its
46 * contributors may be used to endorse or promote products derived
47 * from this software without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
50 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
51 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
52 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
53 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
54 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
55 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
59 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
60 *****************************************************************************/
61 #include <linux/etherdevice.h>
62 #include <linux/skbuff.h>
63 #include "iwl-trans.h"
64 #include "mvm.h"
65 #include "fw-api.h"
66
67 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb,
68 int queue, struct ieee80211_sta *sta)
69 {
70 struct iwl_mvm_sta *mvmsta;
71 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
72 struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb);
73 struct iwl_mvm_key_pn *ptk_pn;
74 u8 tid, keyidx;
75 u8 pn[IEEE80211_CCMP_PN_LEN];
76 u8 *extiv;
77
78 /* do PN checking */
79
80 /* multicast and non-data only arrives on default queue */
81 if (!ieee80211_is_data(hdr->frame_control) ||
82 is_multicast_ether_addr(hdr->addr1))
83 return 0;
84
85 /* do not check PN for open AP */
86 if (!(stats->flag & RX_FLAG_DECRYPTED))
87 return 0;
88
89 /*
90 * avoid checking for default queue - we don't want to replicate
91 * all the logic that's necessary for checking the PN on fragmented
92 * frames, leave that to mac80211
93 */
94 if (queue == 0)
95 return 0;
96
97 /* if we are here - this for sure is either CCMP or GCMP */
98 if (IS_ERR_OR_NULL(sta)) {
99 IWL_ERR(mvm,
100 "expected hw-decrypted unicast frame for station\n");
101 return -1;
102 }
103
104 mvmsta = iwl_mvm_sta_from_mac80211(sta);
105
106 extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
107 keyidx = extiv[3] >> 6;
108
109 ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]);
110 if (!ptk_pn)
111 return -1;
112
113 if (ieee80211_is_data_qos(hdr->frame_control))
114 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
115 else
116 tid = 0;
117
118 /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */
119 if (tid >= IWL_MAX_TID_COUNT)
120 return -1;
121
122 /* load pn */
123 pn[0] = extiv[7];
124 pn[1] = extiv[6];
125 pn[2] = extiv[5];
126 pn[3] = extiv[4];
127 pn[4] = extiv[1];
128 pn[5] = extiv[0];
129
130 if (memcmp(pn, ptk_pn->q[queue].pn[tid],
131 IEEE80211_CCMP_PN_LEN) <= 0)
132 return -1;
133
134 if (!(stats->flag & RX_FLAG_AMSDU_MORE))
135 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
136 stats->flag |= RX_FLAG_PN_VALIDATED;
137
138 return 0;
139 }
140
141 /* iwl_mvm_create_skb Adds the rxb to a new skb */
142 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr,
143 u16 len, u8 crypt_len,
144 struct iwl_rx_cmd_buffer *rxb)
145 {
146 struct iwl_rx_packet *pkt = rxb_addr(rxb);
147 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
148 unsigned int headlen, fraglen, pad_len = 0;
149 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
150
151 if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) {
152 pad_len = 2;
153
154 /*
155 * If the device inserted padding it means that (it thought)
156 * the 802.11 header wasn't a multiple of 4 bytes long. In
157 * this case, reserve two bytes at the start of the SKB to
158 * align the payload properly in case we end up copying it.
159 */
160 skb_reserve(skb, pad_len);
161 }
162 len -= pad_len;
163
164 /* If frame is small enough to fit in skb->head, pull it completely.
165 * If not, only pull ieee80211_hdr (including crypto if present, and
166 * an additional 8 bytes for SNAP/ethertype, see below) so that
167 * splice() or TCP coalesce are more efficient.
168 *
169 * Since, in addition, ieee80211_data_to_8023() always pull in at
170 * least 8 bytes (possibly more for mesh) we can do the same here
171 * to save the cost of doing it later. That still doesn't pull in
172 * the actual IP header since the typical case has a SNAP header.
173 * If the latter changes (there are efforts in the standards group
174 * to do so) we should revisit this and ieee80211_data_to_8023().
175 */
176 headlen = (len <= skb_tailroom(skb)) ? len :
177 hdrlen + crypt_len + 8;
178
179 /* The firmware may align the packet to DWORD.
180 * The padding is inserted after the IV.
181 * After copying the header + IV skip the padding if
182 * present before copying packet data.
183 */
184 hdrlen += crypt_len;
185 skb_put_data(skb, hdr, hdrlen);
186 skb_put_data(skb, (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen);
187
188 fraglen = len - headlen;
189
190 if (fraglen) {
191 int offset = (void *)hdr + headlen + pad_len -
192 rxb_addr(rxb) + rxb_offset(rxb);
193
194 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
195 fraglen, rxb->truesize);
196 }
197 }
198
199 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
200 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
201 struct napi_struct *napi,
202 struct sk_buff *skb, int queue,
203 struct ieee80211_sta *sta)
204 {
205 if (iwl_mvm_check_pn(mvm, skb, queue, sta))
206 kfree_skb(skb);
207 else
208 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
209 }
210
211 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
212 struct iwl_rx_mpdu_desc *desc,
213 struct ieee80211_rx_status *rx_status)
214 {
215 int energy_a, energy_b, max_energy;
216
217 energy_a = desc->energy_a;
218 energy_a = energy_a ? -energy_a : S8_MIN;
219 energy_b = desc->energy_b;
220 energy_b = energy_b ? -energy_b : S8_MIN;
221 max_energy = max(energy_a, energy_b);
222
223 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
224 energy_a, energy_b, max_energy);
225
226 rx_status->signal = max_energy;
227 rx_status->chains = 0; /* TODO: phy info */
228 rx_status->chain_signal[0] = energy_a;
229 rx_status->chain_signal[1] = energy_b;
230 rx_status->chain_signal[2] = S8_MIN;
231 }
232
233 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
234 struct ieee80211_rx_status *stats,
235 struct iwl_rx_mpdu_desc *desc, int queue,
236 u8 *crypt_len)
237 {
238 u16 status = le16_to_cpu(desc->status);
239
240 if (!ieee80211_has_protected(hdr->frame_control) ||
241 (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
242 IWL_RX_MPDU_STATUS_SEC_NONE)
243 return 0;
244
245 /* TODO: handle packets encrypted with unknown alg */
246
247 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
248 case IWL_RX_MPDU_STATUS_SEC_CCM:
249 case IWL_RX_MPDU_STATUS_SEC_GCM:
250 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
251 /* alg is CCM: check MIC only */
252 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
253 return -1;
254
255 stats->flag |= RX_FLAG_DECRYPTED;
256 *crypt_len = IEEE80211_CCMP_HDR_LEN;
257 return 0;
258 case IWL_RX_MPDU_STATUS_SEC_TKIP:
259 /* Don't drop the frame and decrypt it in SW */
260 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
261 return 0;
262
263 *crypt_len = IEEE80211_TKIP_IV_LEN;
264 /* fall through if TTAK OK */
265 case IWL_RX_MPDU_STATUS_SEC_WEP:
266 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
267 return -1;
268
269 stats->flag |= RX_FLAG_DECRYPTED;
270 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
271 IWL_RX_MPDU_STATUS_SEC_WEP)
272 *crypt_len = IEEE80211_WEP_IV_LEN;
273 return 0;
274 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
275 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
276 return -1;
277 stats->flag |= RX_FLAG_DECRYPTED;
278 return 0;
279 default:
280 /* Expected in monitor (not having the keys) */
281 if (!mvm->monitor_on)
282 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
283 }
284
285 return 0;
286 }
287
288 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
289 struct sk_buff *skb,
290 struct iwl_rx_mpdu_desc *desc)
291 {
292 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
293 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
294 u16 flags = le16_to_cpu(desc->l3l4_flags);
295 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
296 IWL_RX_L3_PROTO_POS);
297
298 if (mvmvif->features & NETIF_F_RXCSUM &&
299 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
300 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
301 l3_prot == IWL_RX_L3_TYPE_IPV6 ||
302 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
303 skb->ip_summed = CHECKSUM_UNNECESSARY;
304 }
305
306 /*
307 * returns true if a packet outside BA session is a duplicate and
308 * should be dropped
309 */
310 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
311 struct ieee80211_rx_status *rx_status,
312 struct ieee80211_hdr *hdr,
313 struct iwl_rx_mpdu_desc *desc)
314 {
315 struct iwl_mvm_sta *mvm_sta;
316 struct iwl_mvm_rxq_dup_data *dup_data;
317 u8 baid, tid, sub_frame_idx;
318
319 if (WARN_ON(IS_ERR_OR_NULL(sta)))
320 return false;
321
322 baid = (le32_to_cpu(desc->reorder_data) &
323 IWL_RX_MPDU_REORDER_BAID_MASK) >>
324 IWL_RX_MPDU_REORDER_BAID_SHIFT;
325
326 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
327 return false;
328
329 mvm_sta = iwl_mvm_sta_from_mac80211(sta);
330 dup_data = &mvm_sta->dup_data[queue];
331
332 /*
333 * Drop duplicate 802.11 retransmissions
334 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
335 */
336 if (ieee80211_is_ctl(hdr->frame_control) ||
337 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
338 is_multicast_ether_addr(hdr->addr1)) {
339 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
340 return false;
341 }
342
343 if (ieee80211_is_data_qos(hdr->frame_control))
344 /* frame has qos control */
345 tid = *ieee80211_get_qos_ctl(hdr) &
346 IEEE80211_QOS_CTL_TID_MASK;
347 else
348 tid = IWL_MAX_TID_COUNT;
349
350 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
351 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
352
353 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
354 dup_data->last_seq[tid] == hdr->seq_ctrl &&
355 dup_data->last_sub_frame[tid] >= sub_frame_idx))
356 return true;
357
358 dup_data->last_seq[tid] = hdr->seq_ctrl;
359 dup_data->last_sub_frame[tid] = sub_frame_idx;
360
361 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
362
363 return false;
364 }
365
366 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
367 const u8 *data, u32 count)
368 {
369 struct iwl_rxq_sync_cmd *cmd;
370 u32 data_size = sizeof(*cmd) + count;
371 int ret;
372
373 /* should be DWORD aligned */
374 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
375 return -EINVAL;
376
377 cmd = kzalloc(data_size, GFP_KERNEL);
378 if (!cmd)
379 return -ENOMEM;
380
381 cmd->rxq_mask = cpu_to_le32(rxq_mask);
382 cmd->count = cpu_to_le32(count);
383 cmd->flags = 0;
384 memcpy(cmd->payload, data, count);
385
386 ret = iwl_mvm_send_cmd_pdu(mvm,
387 WIDE_ID(DATA_PATH_GROUP,
388 TRIGGER_RX_QUEUES_NOTIF_CMD),
389 0, data_size, cmd);
390
391 kfree(cmd);
392 return ret;
393 }
394
395 /*
396 * Returns true if sn2 - buffer_size < sn1 < sn2.
397 * To be used only in order to compare reorder buffer head with NSSN.
398 * We fully trust NSSN unless it is behind us due to reorder timeout.
399 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
400 */
401 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
402 {
403 return ieee80211_sn_less(sn1, sn2) &&
404 !ieee80211_sn_less(sn1, sn2 - buffer_size);
405 }
406
407 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
408
409 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
410 struct ieee80211_sta *sta,
411 struct napi_struct *napi,
412 struct iwl_mvm_reorder_buffer *reorder_buf,
413 u16 nssn)
414 {
415 u16 ssn = reorder_buf->head_sn;
416
417 lockdep_assert_held(&reorder_buf->lock);
418
419 /* ignore nssn smaller than head sn - this can happen due to timeout */
420 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
421 goto set_timer;
422
423 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
424 int index = ssn % reorder_buf->buf_size;
425 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
426 struct sk_buff *skb;
427
428 ssn = ieee80211_sn_inc(ssn);
429
430 /*
431 * Empty the list. Will have more than one frame for A-MSDU.
432 * Empty list is valid as well since nssn indicates frames were
433 * received.
434 */
435 while ((skb = __skb_dequeue(skb_list))) {
436 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
437 reorder_buf->queue,
438 sta);
439 reorder_buf->num_stored--;
440 }
441 }
442 reorder_buf->head_sn = nssn;
443
444 set_timer:
445 if (reorder_buf->num_stored && !reorder_buf->removed) {
446 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
447
448 while (skb_queue_empty(&reorder_buf->entries[index]))
449 index = (index + 1) % reorder_buf->buf_size;
450 /* modify timer to match next frame's expiration time */
451 mod_timer(&reorder_buf->reorder_timer,
452 reorder_buf->reorder_time[index] + 1 +
453 RX_REORDER_BUF_TIMEOUT_MQ);
454 } else {
455 del_timer(&reorder_buf->reorder_timer);
456 }
457 }
458
459 void iwl_mvm_reorder_timer_expired(unsigned long data)
460 {
461 struct iwl_mvm_reorder_buffer *buf = (void *)data;
462 int i;
463 u16 sn = 0, index = 0;
464 bool expired = false;
465 bool cont = false;
466
467 spin_lock(&buf->lock);
468
469 if (!buf->num_stored || buf->removed) {
470 spin_unlock(&buf->lock);
471 return;
472 }
473
474 for (i = 0; i < buf->buf_size ; i++) {
475 index = (buf->head_sn + i) % buf->buf_size;
476
477 if (skb_queue_empty(&buf->entries[index])) {
478 /*
479 * If there is a hole and the next frame didn't expire
480 * we want to break and not advance SN
481 */
482 cont = false;
483 continue;
484 }
485 if (!cont && !time_after(jiffies, buf->reorder_time[index] +
486 RX_REORDER_BUF_TIMEOUT_MQ))
487 break;
488
489 expired = true;
490 /* continue until next hole after this expired frames */
491 cont = true;
492 sn = ieee80211_sn_add(buf->head_sn, i + 1);
493 }
494
495 if (expired) {
496 struct ieee80211_sta *sta;
497
498 rcu_read_lock();
499 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
500 /* SN is set to the last expired frame + 1 */
501 IWL_DEBUG_HT(buf->mvm,
502 "Releasing expired frames for sta %u, sn %d\n",
503 buf->sta_id, sn);
504 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
505 rcu_read_unlock();
506 } else {
507 /*
508 * If no frame expired and there are stored frames, index is now
509 * pointing to the first unexpired frame - modify timer
510 * accordingly to this frame.
511 */
512 mod_timer(&buf->reorder_timer,
513 buf->reorder_time[index] +
514 1 + RX_REORDER_BUF_TIMEOUT_MQ);
515 }
516 spin_unlock(&buf->lock);
517 }
518
519 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
520 struct iwl_mvm_delba_data *data)
521 {
522 struct iwl_mvm_baid_data *ba_data;
523 struct ieee80211_sta *sta;
524 struct iwl_mvm_reorder_buffer *reorder_buf;
525 u8 baid = data->baid;
526
527 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid))
528 return;
529
530 rcu_read_lock();
531
532 ba_data = rcu_dereference(mvm->baid_map[baid]);
533 if (WARN_ON_ONCE(!ba_data))
534 goto out;
535
536 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
537 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
538 goto out;
539
540 reorder_buf = &ba_data->reorder_buf[queue];
541
542 /* release all frames that are in the reorder buffer to the stack */
543 spin_lock_bh(&reorder_buf->lock);
544 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
545 ieee80211_sn_add(reorder_buf->head_sn,
546 reorder_buf->buf_size));
547 spin_unlock_bh(&reorder_buf->lock);
548 del_timer_sync(&reorder_buf->reorder_timer);
549
550 out:
551 rcu_read_unlock();
552 }
553
554 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
555 int queue)
556 {
557 struct iwl_rx_packet *pkt = rxb_addr(rxb);
558 struct iwl_rxq_sync_notification *notif;
559 struct iwl_mvm_internal_rxq_notif *internal_notif;
560
561 notif = (void *)pkt->data;
562 internal_notif = (void *)notif->payload;
563
564 if (internal_notif->sync) {
565 if (mvm->queue_sync_cookie != internal_notif->cookie) {
566 WARN_ONCE(1,
567 "Received expired RX queue sync message\n");
568 return;
569 }
570 if (!atomic_dec_return(&mvm->queue_sync_counter))
571 wake_up(&mvm->rx_sync_waitq);
572 }
573
574 switch (internal_notif->type) {
575 case IWL_MVM_RXQ_EMPTY:
576 break;
577 case IWL_MVM_RXQ_NOTIF_DEL_BA:
578 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
579 break;
580 default:
581 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
582 }
583 }
584
585 /*
586 * Returns true if the MPDU was buffered\dropped, false if it should be passed
587 * to upper layer.
588 */
589 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
590 struct napi_struct *napi,
591 int queue,
592 struct ieee80211_sta *sta,
593 struct sk_buff *skb,
594 struct iwl_rx_mpdu_desc *desc)
595 {
596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
597 struct iwl_mvm_sta *mvm_sta;
598 struct iwl_mvm_baid_data *baid_data;
599 struct iwl_mvm_reorder_buffer *buffer;
600 struct sk_buff *tail;
601 u32 reorder = le32_to_cpu(desc->reorder_data);
602 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
603 bool last_subframe =
604 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
605 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
606 u8 sub_frame_idx = desc->amsdu_info &
607 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
608 int index;
609 u16 nssn, sn;
610 u8 baid;
611
612 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
613 IWL_RX_MPDU_REORDER_BAID_SHIFT;
614
615 /*
616 * This also covers the case of receiving a Block Ack Request
617 * outside a BA session; we'll pass it to mac80211 and that
618 * then sends a delBA action frame.
619 */
620 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
621 return false;
622
623 /* no sta yet */
624 if (WARN_ON(IS_ERR_OR_NULL(sta)))
625 return false;
626
627 mvm_sta = iwl_mvm_sta_from_mac80211(sta);
628
629 /* not a data packet or a bar */
630 if (!ieee80211_is_back_req(hdr->frame_control) &&
631 (!ieee80211_is_data_qos(hdr->frame_control) ||
632 is_multicast_ether_addr(hdr->addr1)))
633 return false;
634
635 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
636 return false;
637
638 baid_data = rcu_dereference(mvm->baid_map[baid]);
639 if (!baid_data) {
640 IWL_DEBUG_RX(mvm,
641 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
642 baid, reorder);
643 return false;
644 }
645
646 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
647 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
648 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
649 tid))
650 return false;
651
652 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
653 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
654 IWL_RX_MPDU_REORDER_SN_SHIFT;
655
656 buffer = &baid_data->reorder_buf[queue];
657
658 spin_lock_bh(&buffer->lock);
659
660 if (!buffer->valid) {
661 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) {
662 spin_unlock_bh(&buffer->lock);
663 return false;
664 }
665 buffer->valid = true;
666 }
667
668 if (ieee80211_is_back_req(hdr->frame_control)) {
669 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
670 goto drop;
671 }
672
673 /*
674 * If there was a significant jump in the nssn - adjust.
675 * If the SN is smaller than the NSSN it might need to first go into
676 * the reorder buffer, in which case we just release up to it and the
677 * rest of the function will take care of storing it and releasing up to
678 * the nssn
679 */
680 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
681 buffer->buf_size) ||
682 !ieee80211_sn_less(sn, buffer->head_sn + buffer->buf_size)) {
683 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
684
685 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
686 }
687
688 /* drop any oudated packets */
689 if (ieee80211_sn_less(sn, buffer->head_sn))
690 goto drop;
691
692 /* release immediately if allowed by nssn and no stored frames */
693 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
694 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
695 buffer->buf_size) &&
696 (!amsdu || last_subframe))
697 buffer->head_sn = nssn;
698 /* No need to update AMSDU last SN - we are moving the head */
699 spin_unlock_bh(&buffer->lock);
700 return false;
701 }
702
703 index = sn % buffer->buf_size;
704
705 /*
706 * Check if we already stored this frame
707 * As AMSDU is either received or not as whole, logic is simple:
708 * If we have frames in that position in the buffer and the last frame
709 * originated from AMSDU had a different SN then it is a retransmission.
710 * If it is the same SN then if the subframe index is incrementing it
711 * is the same AMSDU - otherwise it is a retransmission.
712 */
713 tail = skb_peek_tail(&buffer->entries[index]);
714 if (tail && !amsdu)
715 goto drop;
716 else if (tail && (sn != buffer->last_amsdu ||
717 buffer->last_sub_index >= sub_frame_idx))
718 goto drop;
719
720 /* put in reorder buffer */
721 __skb_queue_tail(&buffer->entries[index], skb);
722 buffer->num_stored++;
723 buffer->reorder_time[index] = jiffies;
724
725 if (amsdu) {
726 buffer->last_amsdu = sn;
727 buffer->last_sub_index = sub_frame_idx;
728 }
729
730 /*
731 * We cannot trust NSSN for AMSDU sub-frames that are not the last.
732 * The reason is that NSSN advances on the first sub-frame, and may
733 * cause the reorder buffer to advance before all the sub-frames arrive.
734 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
735 * SN 1. NSSN for first sub frame will be 3 with the result of driver
736 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
737 * already ahead and it will be dropped.
738 * If the last sub-frame is not on this queue - we will get frame
739 * release notification with up to date NSSN.
740 */
741 if (!amsdu || last_subframe)
742 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
743
744 spin_unlock_bh(&buffer->lock);
745 return true;
746
747 drop:
748 kfree_skb(skb);
749 spin_unlock_bh(&buffer->lock);
750 return true;
751 }
752
753 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm,
754 u32 reorder_data, u8 baid)
755 {
756 unsigned long now = jiffies;
757 unsigned long timeout;
758 struct iwl_mvm_baid_data *data;
759
760 rcu_read_lock();
761
762 data = rcu_dereference(mvm->baid_map[baid]);
763 if (!data) {
764 IWL_DEBUG_RX(mvm,
765 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
766 baid, reorder_data);
767 goto out;
768 }
769
770 if (!data->timeout)
771 goto out;
772
773 timeout = data->timeout;
774 /*
775 * Do not update last rx all the time to avoid cache bouncing
776 * between the rx queues.
777 * Update it every timeout. Worst case is the session will
778 * expire after ~ 2 * timeout, which doesn't matter that much.
779 */
780 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
781 /* Update is atomic */
782 data->last_rx = now;
783
784 out:
785 rcu_read_unlock();
786 }
787
788 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
789 struct iwl_rx_cmd_buffer *rxb, int queue)
790 {
791 struct ieee80211_rx_status *rx_status;
792 struct iwl_rx_packet *pkt = rxb_addr(rxb);
793 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
794 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
795 u32 len = le16_to_cpu(desc->mpdu_len);
796 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
797 u16 phy_info = le16_to_cpu(desc->phy_info);
798 struct ieee80211_sta *sta = NULL;
799 struct sk_buff *skb;
800 u8 crypt_len = 0;
801
802 /* Dont use dev_alloc_skb(), we'll have enough headroom once
803 * ieee80211_hdr pulled.
804 */
805 skb = alloc_skb(128, GFP_ATOMIC);
806 if (!skb) {
807 IWL_ERR(mvm, "alloc_skb failed\n");
808 return;
809 }
810
811 rx_status = IEEE80211_SKB_RXCB(skb);
812
813 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
814 kfree_skb(skb);
815 return;
816 }
817
818 /*
819 * Keep packets with CRC errors (and with overrun) for monitor mode
820 * (otherwise the firmware discards them) but mark them as bad.
821 */
822 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
823 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
824 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
825 le16_to_cpu(desc->status));
826 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
827 }
828 /* set the preamble flag if appropriate */
829 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
830 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
831
832 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
833 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
834 /* TSF as indicated by the firmware is at INA time */
835 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
836 }
837 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
838 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
839 NL80211_BAND_2GHZ;
840 rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
841 rx_status->band);
842 iwl_mvm_get_signal_strength(mvm, desc, rx_status);
843
844 /* update aggregation data for monitor sake on default queue */
845 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
846 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
847
848 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
849 rx_status->ampdu_reference = mvm->ampdu_ref;
850 /* toggle is switched whenever new aggregation starts */
851 if (toggle_bit != mvm->ampdu_toggle) {
852 mvm->ampdu_ref++;
853 mvm->ampdu_toggle = toggle_bit;
854 }
855 }
856
857 rcu_read_lock();
858
859 if (desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_SRC_STA_FOUND)) {
860 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
861
862 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
863 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
864 if (IS_ERR(sta))
865 sta = NULL;
866 }
867 } else if (!is_multicast_ether_addr(hdr->addr2)) {
868 /*
869 * This is fine since we prevent two stations with the same
870 * address from being added.
871 */
872 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
873 }
874
875 if (sta) {
876 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
877 struct ieee80211_vif *tx_blocked_vif =
878 rcu_dereference(mvm->csa_tx_blocked_vif);
879 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
880 IWL_RX_MPDU_REORDER_BAID_MASK) >>
881 IWL_RX_MPDU_REORDER_BAID_SHIFT);
882
883 /*
884 * We have tx blocked stations (with CS bit). If we heard
885 * frames from a blocked station on a new channel we can
886 * TX to it again.
887 */
888 if (unlikely(tx_blocked_vif) &&
889 tx_blocked_vif == mvmsta->vif) {
890 struct iwl_mvm_vif *mvmvif =
891 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
892
893 if (mvmvif->csa_target_freq == rx_status->freq)
894 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
895 false);
896 }
897
898 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
899
900 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
901 ieee80211_is_beacon(hdr->frame_control)) {
902 struct iwl_fw_dbg_trigger_tlv *trig;
903 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
904 bool trig_check;
905 s32 rssi;
906
907 trig = iwl_fw_dbg_get_trigger(mvm->fw,
908 FW_DBG_TRIGGER_RSSI);
909 rssi_trig = (void *)trig->data;
910 rssi = le32_to_cpu(rssi_trig->rssi);
911
912 trig_check =
913 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
914 ieee80211_vif_to_wdev(mvmsta->vif),
915 trig);
916 if (trig_check && rx_status->signal < rssi)
917 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
918 NULL);
919 }
920
921 if (ieee80211_is_data(hdr->frame_control))
922 iwl_mvm_rx_csum(sta, skb, desc);
923
924 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
925 kfree_skb(skb);
926 goto out;
927 }
928
929 /*
930 * Our hardware de-aggregates AMSDUs but copies the mac header
931 * as it to the de-aggregated MPDUs. We need to turn off the
932 * AMSDU bit in the QoS control ourselves.
933 * In addition, HW reverses addr3 and addr4 - reverse it back.
934 */
935 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
936 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
937 int i;
938 u8 *qc = ieee80211_get_qos_ctl(hdr);
939 u8 mac_addr[ETH_ALEN];
940
941 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
942
943 for (i = 0; i < ETH_ALEN; i++)
944 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1];
945 ether_addr_copy(hdr->addr3, mac_addr);
946
947 if (ieee80211_has_a4(hdr->frame_control)) {
948 for (i = 0; i < ETH_ALEN; i++)
949 mac_addr[i] =
950 hdr->addr4[ETH_ALEN - i - 1];
951 ether_addr_copy(hdr->addr4, mac_addr);
952 }
953 }
954 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) {
955 u32 reorder_data = le32_to_cpu(desc->reorder_data);
956
957 iwl_mvm_agg_rx_received(mvm, reorder_data, baid);
958 }
959 }
960
961 /* Set up the HT phy flags */
962 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
963 case RATE_MCS_CHAN_WIDTH_20:
964 break;
965 case RATE_MCS_CHAN_WIDTH_40:
966 rx_status->bw = RATE_INFO_BW_40;
967 break;
968 case RATE_MCS_CHAN_WIDTH_80:
969 rx_status->bw = RATE_INFO_BW_80;
970 break;
971 case RATE_MCS_CHAN_WIDTH_160:
972 rx_status->bw = RATE_INFO_BW_160;
973 break;
974 }
975 if (rate_n_flags & RATE_MCS_SGI_MSK)
976 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
977 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
978 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
979 if (rate_n_flags & RATE_MCS_LDPC_MSK)
980 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
981 if (rate_n_flags & RATE_MCS_HT_MSK) {
982 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
983 RATE_MCS_STBC_POS;
984 rx_status->encoding = RX_ENC_HT;
985 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
986 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
987 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
988 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
989 RATE_MCS_STBC_POS;
990 rx_status->nss =
991 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
992 RATE_VHT_MCS_NSS_POS) + 1;
993 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
994 rx_status->encoding = RX_ENC_VHT;
995 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
996 if (rate_n_flags & RATE_MCS_BF_MSK)
997 rx_status->enc_flags |= RX_ENC_FLAG_BF;
998 } else {
999 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
1000 rx_status->band);
1001
1002 if (WARN(rate < 0 || rate > 0xFF,
1003 "Invalid rate flags 0x%x, band %d,\n",
1004 rate_n_flags, rx_status->band)) {
1005 kfree_skb(skb);
1006 goto out;
1007 }
1008 rx_status->rate_idx = rate;
1009
1010 }
1011
1012 /* management stuff on default queue */
1013 if (!queue) {
1014 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
1015 ieee80211_is_probe_resp(hdr->frame_control)) &&
1016 mvm->sched_scan_pass_all ==
1017 SCHED_SCAN_PASS_ALL_ENABLED))
1018 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
1019
1020 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
1021 ieee80211_is_probe_resp(hdr->frame_control)))
1022 rx_status->boottime_ns = ktime_get_boot_ns();
1023 }
1024
1025 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
1026 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
1027 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
1028 out:
1029 rcu_read_unlock();
1030 }
1031
1032 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
1033 struct iwl_rx_cmd_buffer *rxb, int queue)
1034 {
1035 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1036 struct iwl_frame_release *release = (void *)pkt->data;
1037 struct ieee80211_sta *sta;
1038 struct iwl_mvm_reorder_buffer *reorder_buf;
1039 struct iwl_mvm_baid_data *ba_data;
1040
1041 int baid = release->baid;
1042
1043 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
1044 release->baid, le16_to_cpu(release->nssn));
1045
1046 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
1047 return;
1048
1049 rcu_read_lock();
1050
1051 ba_data = rcu_dereference(mvm->baid_map[baid]);
1052 if (WARN_ON_ONCE(!ba_data))
1053 goto out;
1054
1055 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
1056 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
1057 goto out;
1058
1059 reorder_buf = &ba_data->reorder_buf[queue];
1060
1061 spin_lock_bh(&reorder_buf->lock);
1062 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
1063 le16_to_cpu(release->nssn));
1064 spin_unlock_bh(&reorder_buf->lock);
1065
1066 out:
1067 rcu_read_unlock();
1068 }
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