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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 u32 rate_flags = le32_to_cpu(desc->rate_n_flags);
217
218 energy_a = desc->energy_a;
219 energy_a = energy_a ? -energy_a : S8_MIN;
220 energy_b = desc->energy_b;
221 energy_b = energy_b ? -energy_b : S8_MIN;
222 max_energy = max(energy_a, energy_b);
223
224 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
225 energy_a, energy_b, max_energy);
226
227 rx_status->signal = max_energy;
228 rx_status->chains =
229 (rate_flags & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
230 rx_status->chain_signal[0] = energy_a;
231 rx_status->chain_signal[1] = energy_b;
232 rx_status->chain_signal[2] = S8_MIN;
233 }
234
235 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
236 struct ieee80211_rx_status *stats,
237 struct iwl_rx_mpdu_desc *desc, u32 pkt_flags,
238 int queue, u8 *crypt_len)
239 {
240 u16 status = le16_to_cpu(desc->status);
241
242 if (!ieee80211_has_protected(hdr->frame_control) ||
243 (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
244 IWL_RX_MPDU_STATUS_SEC_NONE)
245 return 0;
246
247 /* TODO: handle packets encrypted with unknown alg */
248
249 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
250 case IWL_RX_MPDU_STATUS_SEC_CCM:
251 case IWL_RX_MPDU_STATUS_SEC_GCM:
252 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
253 /* alg is CCM: check MIC only */
254 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
255 return -1;
256
257 stats->flag |= RX_FLAG_DECRYPTED;
258 if (pkt_flags & FH_RSCSR_RADA_EN)
259 stats->flag |= RX_FLAG_MIC_STRIPPED;
260 *crypt_len = IEEE80211_CCMP_HDR_LEN;
261 return 0;
262 case IWL_RX_MPDU_STATUS_SEC_TKIP:
263 /* Don't drop the frame and decrypt it in SW */
264 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
265 return 0;
266
267 *crypt_len = IEEE80211_TKIP_IV_LEN;
268 /* fall through if TTAK OK */
269 case IWL_RX_MPDU_STATUS_SEC_WEP:
270 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
271 return -1;
272
273 stats->flag |= RX_FLAG_DECRYPTED;
274 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
275 IWL_RX_MPDU_STATUS_SEC_WEP)
276 *crypt_len = IEEE80211_WEP_IV_LEN;
277
278 if (pkt_flags & FH_RSCSR_RADA_EN)
279 stats->flag |= RX_FLAG_ICV_STRIPPED;
280
281 return 0;
282 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
283 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
284 return -1;
285 stats->flag |= RX_FLAG_DECRYPTED;
286 return 0;
287 default:
288 /* Expected in monitor (not having the keys) */
289 if (!mvm->monitor_on)
290 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
291 }
292
293 return 0;
294 }
295
296 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
297 struct sk_buff *skb,
298 struct iwl_rx_mpdu_desc *desc)
299 {
300 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
301 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
302 u16 flags = le16_to_cpu(desc->l3l4_flags);
303 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
304 IWL_RX_L3_PROTO_POS);
305
306 if (mvmvif->features & NETIF_F_RXCSUM &&
307 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
308 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
309 l3_prot == IWL_RX_L3_TYPE_IPV6 ||
310 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
311 skb->ip_summed = CHECKSUM_UNNECESSARY;
312 }
313
314 /*
315 * returns true if a packet outside BA session is a duplicate and
316 * should be dropped
317 */
318 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
319 struct ieee80211_rx_status *rx_status,
320 struct ieee80211_hdr *hdr,
321 struct iwl_rx_mpdu_desc *desc)
322 {
323 struct iwl_mvm_sta *mvm_sta;
324 struct iwl_mvm_rxq_dup_data *dup_data;
325 u8 baid, tid, sub_frame_idx;
326
327 if (WARN_ON(IS_ERR_OR_NULL(sta)))
328 return false;
329
330 baid = (le32_to_cpu(desc->reorder_data) &
331 IWL_RX_MPDU_REORDER_BAID_MASK) >>
332 IWL_RX_MPDU_REORDER_BAID_SHIFT;
333
334 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
335 return false;
336
337 mvm_sta = iwl_mvm_sta_from_mac80211(sta);
338 dup_data = &mvm_sta->dup_data[queue];
339
340 /*
341 * Drop duplicate 802.11 retransmissions
342 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
343 */
344 if (ieee80211_is_ctl(hdr->frame_control) ||
345 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
346 is_multicast_ether_addr(hdr->addr1)) {
347 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
348 return false;
349 }
350
351 if (ieee80211_is_data_qos(hdr->frame_control))
352 /* frame has qos control */
353 tid = *ieee80211_get_qos_ctl(hdr) &
354 IEEE80211_QOS_CTL_TID_MASK;
355 else
356 tid = IWL_MAX_TID_COUNT;
357
358 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
359 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
360
361 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
362 dup_data->last_seq[tid] == hdr->seq_ctrl &&
363 dup_data->last_sub_frame[tid] >= sub_frame_idx))
364 return true;
365
366 dup_data->last_seq[tid] = hdr->seq_ctrl;
367 dup_data->last_sub_frame[tid] = sub_frame_idx;
368
369 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
370
371 return false;
372 }
373
374 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
375 const u8 *data, u32 count)
376 {
377 struct iwl_rxq_sync_cmd *cmd;
378 u32 data_size = sizeof(*cmd) + count;
379 int ret;
380
381 /* should be DWORD aligned */
382 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
383 return -EINVAL;
384
385 cmd = kzalloc(data_size, GFP_KERNEL);
386 if (!cmd)
387 return -ENOMEM;
388
389 cmd->rxq_mask = cpu_to_le32(rxq_mask);
390 cmd->count = cpu_to_le32(count);
391 cmd->flags = 0;
392 memcpy(cmd->payload, data, count);
393
394 ret = iwl_mvm_send_cmd_pdu(mvm,
395 WIDE_ID(DATA_PATH_GROUP,
396 TRIGGER_RX_QUEUES_NOTIF_CMD),
397 0, data_size, cmd);
398
399 kfree(cmd);
400 return ret;
401 }
402
403 /*
404 * Returns true if sn2 - buffer_size < sn1 < sn2.
405 * To be used only in order to compare reorder buffer head with NSSN.
406 * We fully trust NSSN unless it is behind us due to reorder timeout.
407 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
408 */
409 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
410 {
411 return ieee80211_sn_less(sn1, sn2) &&
412 !ieee80211_sn_less(sn1, sn2 - buffer_size);
413 }
414
415 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
416
417 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
418 struct ieee80211_sta *sta,
419 struct napi_struct *napi,
420 struct iwl_mvm_baid_data *baid_data,
421 struct iwl_mvm_reorder_buffer *reorder_buf,
422 u16 nssn)
423 {
424 struct iwl_mvm_reorder_buf_entry *entries =
425 &baid_data->entries[reorder_buf->queue *
426 baid_data->entries_per_queue];
427 u16 ssn = reorder_buf->head_sn;
428
429 lockdep_assert_held(&reorder_buf->lock);
430
431 /* ignore nssn smaller than head sn - this can happen due to timeout */
432 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
433 goto set_timer;
434
435 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
436 int index = ssn % reorder_buf->buf_size;
437 struct sk_buff_head *skb_list = &entries[index].e.frames;
438 struct sk_buff *skb;
439
440 ssn = ieee80211_sn_inc(ssn);
441
442 /*
443 * Empty the list. Will have more than one frame for A-MSDU.
444 * Empty list is valid as well since nssn indicates frames were
445 * received.
446 */
447 while ((skb = __skb_dequeue(skb_list))) {
448 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
449 reorder_buf->queue,
450 sta);
451 reorder_buf->num_stored--;
452 }
453 }
454 reorder_buf->head_sn = nssn;
455
456 set_timer:
457 if (reorder_buf->num_stored && !reorder_buf->removed) {
458 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
459
460 while (skb_queue_empty(&entries[index].e.frames))
461 index = (index + 1) % reorder_buf->buf_size;
462 /* modify timer to match next frame's expiration time */
463 mod_timer(&reorder_buf->reorder_timer,
464 entries[index].e.reorder_time + 1 +
465 RX_REORDER_BUF_TIMEOUT_MQ);
466 } else {
467 del_timer(&reorder_buf->reorder_timer);
468 }
469 }
470
471 void iwl_mvm_reorder_timer_expired(struct timer_list *t)
472 {
473 struct iwl_mvm_reorder_buffer *buf = from_timer(buf, t, reorder_timer);
474 struct iwl_mvm_baid_data *baid_data =
475 iwl_mvm_baid_data_from_reorder_buf(buf);
476 struct iwl_mvm_reorder_buf_entry *entries =
477 &baid_data->entries[buf->queue * baid_data->entries_per_queue];
478 int i;
479 u16 sn = 0, index = 0;
480 bool expired = false;
481 bool cont = false;
482
483 spin_lock(&buf->lock);
484
485 if (!buf->num_stored || buf->removed) {
486 spin_unlock(&buf->lock);
487 return;
488 }
489
490 for (i = 0; i < buf->buf_size ; i++) {
491 index = (buf->head_sn + i) % buf->buf_size;
492
493 if (skb_queue_empty(&entries[index].e.frames)) {
494 /*
495 * If there is a hole and the next frame didn't expire
496 * we want to break and not advance SN
497 */
498 cont = false;
499 continue;
500 }
501 if (!cont &&
502 !time_after(jiffies, entries[index].e.reorder_time +
503 RX_REORDER_BUF_TIMEOUT_MQ))
504 break;
505
506 expired = true;
507 /* continue until next hole after this expired frames */
508 cont = true;
509 sn = ieee80211_sn_add(buf->head_sn, i + 1);
510 }
511
512 if (expired) {
513 struct ieee80211_sta *sta;
514 struct iwl_mvm_sta *mvmsta;
515 u8 sta_id = baid_data->sta_id;
516
517 rcu_read_lock();
518 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[sta_id]);
519 mvmsta = iwl_mvm_sta_from_mac80211(sta);
520
521 /* SN is set to the last expired frame + 1 */
522 IWL_DEBUG_HT(buf->mvm,
523 "Releasing expired frames for sta %u, sn %d\n",
524 sta_id, sn);
525 iwl_mvm_event_frame_timeout_callback(buf->mvm, mvmsta->vif,
526 sta, baid_data->tid);
527 iwl_mvm_release_frames(buf->mvm, sta, NULL, baid_data, buf, sn);
528 rcu_read_unlock();
529 } else {
530 /*
531 * If no frame expired and there are stored frames, index is now
532 * pointing to the first unexpired frame - modify timer
533 * accordingly to this frame.
534 */
535 mod_timer(&buf->reorder_timer,
536 entries[index].e.reorder_time +
537 1 + RX_REORDER_BUF_TIMEOUT_MQ);
538 }
539 spin_unlock(&buf->lock);
540 }
541
542 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
543 struct iwl_mvm_delba_data *data)
544 {
545 struct iwl_mvm_baid_data *ba_data;
546 struct ieee80211_sta *sta;
547 struct iwl_mvm_reorder_buffer *reorder_buf;
548 u8 baid = data->baid;
549
550 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid))
551 return;
552
553 rcu_read_lock();
554
555 ba_data = rcu_dereference(mvm->baid_map[baid]);
556 if (WARN_ON_ONCE(!ba_data))
557 goto out;
558
559 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
560 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
561 goto out;
562
563 reorder_buf = &ba_data->reorder_buf[queue];
564
565 /* release all frames that are in the reorder buffer to the stack */
566 spin_lock_bh(&reorder_buf->lock);
567 iwl_mvm_release_frames(mvm, sta, NULL, ba_data, reorder_buf,
568 ieee80211_sn_add(reorder_buf->head_sn,
569 reorder_buf->buf_size));
570 spin_unlock_bh(&reorder_buf->lock);
571 del_timer_sync(&reorder_buf->reorder_timer);
572
573 out:
574 rcu_read_unlock();
575 }
576
577 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
578 int queue)
579 {
580 struct iwl_rx_packet *pkt = rxb_addr(rxb);
581 struct iwl_rxq_sync_notification *notif;
582 struct iwl_mvm_internal_rxq_notif *internal_notif;
583
584 notif = (void *)pkt->data;
585 internal_notif = (void *)notif->payload;
586
587 if (internal_notif->sync) {
588 if (mvm->queue_sync_cookie != internal_notif->cookie) {
589 WARN_ONCE(1,
590 "Received expired RX queue sync message\n");
591 return;
592 }
593 if (!atomic_dec_return(&mvm->queue_sync_counter))
594 wake_up(&mvm->rx_sync_waitq);
595 }
596
597 switch (internal_notif->type) {
598 case IWL_MVM_RXQ_EMPTY:
599 break;
600 case IWL_MVM_RXQ_NOTIF_DEL_BA:
601 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
602 break;
603 default:
604 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
605 }
606 }
607
608 /*
609 * Returns true if the MPDU was buffered\dropped, false if it should be passed
610 * to upper layer.
611 */
612 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
613 struct napi_struct *napi,
614 int queue,
615 struct ieee80211_sta *sta,
616 struct sk_buff *skb,
617 struct iwl_rx_mpdu_desc *desc)
618 {
619 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
620 struct iwl_mvm_sta *mvm_sta;
621 struct iwl_mvm_baid_data *baid_data;
622 struct iwl_mvm_reorder_buffer *buffer;
623 struct sk_buff *tail;
624 u32 reorder = le32_to_cpu(desc->reorder_data);
625 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
626 bool last_subframe =
627 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
628 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
629 u8 sub_frame_idx = desc->amsdu_info &
630 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
631 struct iwl_mvm_reorder_buf_entry *entries;
632 int index;
633 u16 nssn, sn;
634 u8 baid;
635
636 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
637 IWL_RX_MPDU_REORDER_BAID_SHIFT;
638
639 /*
640 * This also covers the case of receiving a Block Ack Request
641 * outside a BA session; we'll pass it to mac80211 and that
642 * then sends a delBA action frame.
643 */
644 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
645 return false;
646
647 /* no sta yet */
648 if (WARN_ONCE(IS_ERR_OR_NULL(sta),
649 "Got valid BAID without a valid station assigned\n"))
650 return false;
651
652 mvm_sta = iwl_mvm_sta_from_mac80211(sta);
653
654 /* not a data packet or a bar */
655 if (!ieee80211_is_back_req(hdr->frame_control) &&
656 (!ieee80211_is_data_qos(hdr->frame_control) ||
657 is_multicast_ether_addr(hdr->addr1)))
658 return false;
659
660 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
661 return false;
662
663 baid_data = rcu_dereference(mvm->baid_map[baid]);
664 if (!baid_data) {
665 IWL_DEBUG_RX(mvm,
666 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
667 baid, reorder);
668 return false;
669 }
670
671 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
672 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
673 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
674 tid))
675 return false;
676
677 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
678 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
679 IWL_RX_MPDU_REORDER_SN_SHIFT;
680
681 buffer = &baid_data->reorder_buf[queue];
682 entries = &baid_data->entries[queue * baid_data->entries_per_queue];
683
684 spin_lock_bh(&buffer->lock);
685
686 if (!buffer->valid) {
687 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) {
688 spin_unlock_bh(&buffer->lock);
689 return false;
690 }
691 buffer->valid = true;
692 }
693
694 if (ieee80211_is_back_req(hdr->frame_control)) {
695 iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, nssn);
696 goto drop;
697 }
698
699 /*
700 * If there was a significant jump in the nssn - adjust.
701 * If the SN is smaller than the NSSN it might need to first go into
702 * the reorder buffer, in which case we just release up to it and the
703 * rest of the function will take care of storing it and releasing up to
704 * the nssn
705 */
706 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
707 buffer->buf_size) ||
708 !ieee80211_sn_less(sn, buffer->head_sn + buffer->buf_size)) {
709 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
710
711 iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer,
712 min_sn);
713 }
714
715 /* drop any oudated packets */
716 if (ieee80211_sn_less(sn, buffer->head_sn))
717 goto drop;
718
719 /* release immediately if allowed by nssn and no stored frames */
720 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
721 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
722 buffer->buf_size) &&
723 (!amsdu || last_subframe))
724 buffer->head_sn = nssn;
725 /* No need to update AMSDU last SN - we are moving the head */
726 spin_unlock_bh(&buffer->lock);
727 return false;
728 }
729
730 /*
731 * release immediately if there are no stored frames, and the sn is
732 * equal to the head.
733 * This can happen due to reorder timer, where NSSN is behind head_sn.
734 * When we released everything, and we got the next frame in the
735 * sequence, according to the NSSN we can't release immediately,
736 * while technically there is no hole and we can move forward.
737 */
738 if (!buffer->num_stored && sn == buffer->head_sn) {
739 if (!amsdu || last_subframe)
740 buffer->head_sn = ieee80211_sn_inc(buffer->head_sn);
741 /* No need to update AMSDU last SN - we are moving the head */
742 spin_unlock_bh(&buffer->lock);
743 return false;
744 }
745
746 index = sn % buffer->buf_size;
747
748 /*
749 * Check if we already stored this frame
750 * As AMSDU is either received or not as whole, logic is simple:
751 * If we have frames in that position in the buffer and the last frame
752 * originated from AMSDU had a different SN then it is a retransmission.
753 * If it is the same SN then if the subframe index is incrementing it
754 * is the same AMSDU - otherwise it is a retransmission.
755 */
756 tail = skb_peek_tail(&entries[index].e.frames);
757 if (tail && !amsdu)
758 goto drop;
759 else if (tail && (sn != buffer->last_amsdu ||
760 buffer->last_sub_index >= sub_frame_idx))
761 goto drop;
762
763 /* put in reorder buffer */
764 __skb_queue_tail(&entries[index].e.frames, skb);
765 buffer->num_stored++;
766 entries[index].e.reorder_time = jiffies;
767
768 if (amsdu) {
769 buffer->last_amsdu = sn;
770 buffer->last_sub_index = sub_frame_idx;
771 }
772
773 /*
774 * We cannot trust NSSN for AMSDU sub-frames that are not the last.
775 * The reason is that NSSN advances on the first sub-frame, and may
776 * cause the reorder buffer to advance before all the sub-frames arrive.
777 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
778 * SN 1. NSSN for first sub frame will be 3 with the result of driver
779 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
780 * already ahead and it will be dropped.
781 * If the last sub-frame is not on this queue - we will get frame
782 * release notification with up to date NSSN.
783 */
784 if (!amsdu || last_subframe)
785 iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, nssn);
786
787 spin_unlock_bh(&buffer->lock);
788 return true;
789
790 drop:
791 kfree_skb(skb);
792 spin_unlock_bh(&buffer->lock);
793 return true;
794 }
795
796 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm,
797 u32 reorder_data, u8 baid)
798 {
799 unsigned long now = jiffies;
800 unsigned long timeout;
801 struct iwl_mvm_baid_data *data;
802
803 rcu_read_lock();
804
805 data = rcu_dereference(mvm->baid_map[baid]);
806 if (!data) {
807 IWL_DEBUG_RX(mvm,
808 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
809 baid, reorder_data);
810 goto out;
811 }
812
813 if (!data->timeout)
814 goto out;
815
816 timeout = data->timeout;
817 /*
818 * Do not update last rx all the time to avoid cache bouncing
819 * between the rx queues.
820 * Update it every timeout. Worst case is the session will
821 * expire after ~ 2 * timeout, which doesn't matter that much.
822 */
823 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
824 /* Update is atomic */
825 data->last_rx = now;
826
827 out:
828 rcu_read_unlock();
829 }
830
831 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
832 struct iwl_rx_cmd_buffer *rxb, int queue)
833 {
834 struct ieee80211_rx_status *rx_status;
835 struct iwl_rx_packet *pkt = rxb_addr(rxb);
836 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
837 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
838 u32 len = le16_to_cpu(desc->mpdu_len);
839 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
840 u16 phy_info = le16_to_cpu(desc->phy_info);
841 struct ieee80211_sta *sta = NULL;
842 struct sk_buff *skb;
843 u8 crypt_len = 0;
844
845 if (unlikely(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)))
846 return;
847
848 /* Dont use dev_alloc_skb(), we'll have enough headroom once
849 * ieee80211_hdr pulled.
850 */
851 skb = alloc_skb(128, GFP_ATOMIC);
852 if (!skb) {
853 IWL_ERR(mvm, "alloc_skb failed\n");
854 return;
855 }
856
857 rx_status = IEEE80211_SKB_RXCB(skb);
858
859 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc,
860 le32_to_cpu(pkt->len_n_flags), queue,
861 &crypt_len)) {
862 kfree_skb(skb);
863 return;
864 }
865
866 /*
867 * Keep packets with CRC errors (and with overrun) for monitor mode
868 * (otherwise the firmware discards them) but mark them as bad.
869 */
870 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
871 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
872 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
873 le16_to_cpu(desc->status));
874 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
875 }
876 /* set the preamble flag if appropriate */
877 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
878 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
879
880 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
881 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
882 /* TSF as indicated by the firmware is at INA time */
883 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
884 }
885 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
886 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
887 NL80211_BAND_2GHZ;
888 rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
889 rx_status->band);
890 iwl_mvm_get_signal_strength(mvm, desc, rx_status);
891
892 /* update aggregation data for monitor sake on default queue */
893 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
894 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
895
896 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
897 rx_status->ampdu_reference = mvm->ampdu_ref;
898 /* toggle is switched whenever new aggregation starts */
899 if (toggle_bit != mvm->ampdu_toggle) {
900 mvm->ampdu_ref++;
901 mvm->ampdu_toggle = toggle_bit;
902 }
903 }
904
905 rcu_read_lock();
906
907 if (desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_SRC_STA_FOUND)) {
908 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
909
910 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
911 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
912 if (IS_ERR(sta))
913 sta = NULL;
914 }
915 } else if (!is_multicast_ether_addr(hdr->addr2)) {
916 /*
917 * This is fine since we prevent two stations with the same
918 * address from being added.
919 */
920 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
921 }
922
923 if (sta) {
924 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
925 struct ieee80211_vif *tx_blocked_vif =
926 rcu_dereference(mvm->csa_tx_blocked_vif);
927 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
928 IWL_RX_MPDU_REORDER_BAID_MASK) >>
929 IWL_RX_MPDU_REORDER_BAID_SHIFT);
930
931 /*
932 * We have tx blocked stations (with CS bit). If we heard
933 * frames from a blocked station on a new channel we can
934 * TX to it again.
935 */
936 if (unlikely(tx_blocked_vif) &&
937 tx_blocked_vif == mvmsta->vif) {
938 struct iwl_mvm_vif *mvmvif =
939 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
940
941 if (mvmvif->csa_target_freq == rx_status->freq)
942 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
943 false);
944 }
945
946 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
947
948 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
949 ieee80211_is_beacon(hdr->frame_control)) {
950 struct iwl_fw_dbg_trigger_tlv *trig;
951 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
952 bool trig_check;
953 s32 rssi;
954
955 trig = iwl_fw_dbg_get_trigger(mvm->fw,
956 FW_DBG_TRIGGER_RSSI);
957 rssi_trig = (void *)trig->data;
958 rssi = le32_to_cpu(rssi_trig->rssi);
959
960 trig_check =
961 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
962 ieee80211_vif_to_wdev(mvmsta->vif),
963 trig);
964 if (trig_check && rx_status->signal < rssi)
965 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
966 NULL);
967 }
968
969 if (ieee80211_is_data(hdr->frame_control))
970 iwl_mvm_rx_csum(sta, skb, desc);
971
972 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
973 kfree_skb(skb);
974 goto out;
975 }
976
977 /*
978 * Our hardware de-aggregates AMSDUs but copies the mac header
979 * as it to the de-aggregated MPDUs. We need to turn off the
980 * AMSDU bit in the QoS control ourselves.
981 * In addition, HW reverses addr3 and addr4 - reverse it back.
982 */
983 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
984 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
985 int i;
986 u8 *qc = ieee80211_get_qos_ctl(hdr);
987 u8 mac_addr[ETH_ALEN];
988
989 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
990
991 for (i = 0; i < ETH_ALEN; i++)
992 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1];
993 ether_addr_copy(hdr->addr3, mac_addr);
994
995 if (ieee80211_has_a4(hdr->frame_control)) {
996 for (i = 0; i < ETH_ALEN; i++)
997 mac_addr[i] =
998 hdr->addr4[ETH_ALEN - i - 1];
999 ether_addr_copy(hdr->addr4, mac_addr);
1000 }
1001 }
1002 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) {
1003 u32 reorder_data = le32_to_cpu(desc->reorder_data);
1004
1005 iwl_mvm_agg_rx_received(mvm, reorder_data, baid);
1006 }
1007 }
1008
1009 /* Set up the HT phy flags */
1010 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
1011 case RATE_MCS_CHAN_WIDTH_20:
1012 break;
1013 case RATE_MCS_CHAN_WIDTH_40:
1014 rx_status->bw = RATE_INFO_BW_40;
1015 break;
1016 case RATE_MCS_CHAN_WIDTH_80:
1017 rx_status->bw = RATE_INFO_BW_80;
1018 break;
1019 case RATE_MCS_CHAN_WIDTH_160:
1020 rx_status->bw = RATE_INFO_BW_160;
1021 break;
1022 }
1023 if (rate_n_flags & RATE_MCS_SGI_MSK)
1024 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
1025 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
1026 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
1027 if (rate_n_flags & RATE_MCS_LDPC_MSK)
1028 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
1029 if (rate_n_flags & RATE_MCS_HT_MSK) {
1030 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
1031 RATE_MCS_STBC_POS;
1032 rx_status->encoding = RX_ENC_HT;
1033 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
1034 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
1035 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
1036 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
1037 RATE_MCS_STBC_POS;
1038 rx_status->nss =
1039 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
1040 RATE_VHT_MCS_NSS_POS) + 1;
1041 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
1042 rx_status->encoding = RX_ENC_VHT;
1043 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
1044 if (rate_n_flags & RATE_MCS_BF_MSK)
1045 rx_status->enc_flags |= RX_ENC_FLAG_BF;
1046 } else {
1047 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
1048 rx_status->band);
1049
1050 if (WARN(rate < 0 || rate > 0xFF,
1051 "Invalid rate flags 0x%x, band %d,\n",
1052 rate_n_flags, rx_status->band)) {
1053 kfree_skb(skb);
1054 goto out;
1055 }
1056 rx_status->rate_idx = rate;
1057
1058 }
1059
1060 /* management stuff on default queue */
1061 if (!queue) {
1062 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
1063 ieee80211_is_probe_resp(hdr->frame_control)) &&
1064 mvm->sched_scan_pass_all ==
1065 SCHED_SCAN_PASS_ALL_ENABLED))
1066 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
1067
1068 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
1069 ieee80211_is_probe_resp(hdr->frame_control)))
1070 rx_status->boottime_ns = ktime_get_boot_ns();
1071 }
1072
1073 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
1074 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
1075 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
1076 out:
1077 rcu_read_unlock();
1078 }
1079
1080 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
1081 struct iwl_rx_cmd_buffer *rxb, int queue)
1082 {
1083 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1084 struct iwl_frame_release *release = (void *)pkt->data;
1085 struct ieee80211_sta *sta;
1086 struct iwl_mvm_reorder_buffer *reorder_buf;
1087 struct iwl_mvm_baid_data *ba_data;
1088
1089 int baid = release->baid;
1090
1091 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
1092 release->baid, le16_to_cpu(release->nssn));
1093
1094 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
1095 return;
1096
1097 rcu_read_lock();
1098
1099 ba_data = rcu_dereference(mvm->baid_map[baid]);
1100 if (WARN_ON_ONCE(!ba_data))
1101 goto out;
1102
1103 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
1104 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
1105 goto out;
1106
1107 reorder_buf = &ba_data->reorder_buf[queue];
1108
1109 spin_lock_bh(&reorder_buf->lock);
1110 iwl_mvm_release_frames(mvm, sta, napi, ba_data, reorder_buf,
1111 le16_to_cpu(release->nssn));
1112 spin_unlock_bh(&reorder_buf->lock);
1113
1114 out:
1115 rcu_read_unlock();
1116 }
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