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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
[deliverable/linux.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 - 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 * 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 - 2016 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 #include "fw-dbg.h"
67
68 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb,
69 int queue, struct ieee80211_sta *sta)
70 {
71 struct iwl_mvm_sta *mvmsta;
72 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
73 struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb);
74 struct iwl_mvm_key_pn *ptk_pn;
75 u8 tid, keyidx;
76 u8 pn[IEEE80211_CCMP_PN_LEN];
77 u8 *extiv;
78
79 /* do PN checking */
80
81 /* multicast and non-data only arrives on default queue */
82 if (!ieee80211_is_data(hdr->frame_control) ||
83 is_multicast_ether_addr(hdr->addr1))
84 return 0;
85
86 /* do not check PN for open AP */
87 if (!(stats->flag & RX_FLAG_DECRYPTED))
88 return 0;
89
90 /*
91 * avoid checking for default queue - we don't want to replicate
92 * all the logic that's necessary for checking the PN on fragmented
93 * frames, leave that to mac80211
94 */
95 if (queue == 0)
96 return 0;
97
98 /* if we are here - this for sure is either CCMP or GCMP */
99 if (IS_ERR_OR_NULL(sta)) {
100 IWL_ERR(mvm,
101 "expected hw-decrypted unicast frame for station\n");
102 return -1;
103 }
104
105 mvmsta = iwl_mvm_sta_from_mac80211(sta);
106
107 extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
108 keyidx = extiv[3] >> 6;
109
110 ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]);
111 if (!ptk_pn)
112 return -1;
113
114 if (ieee80211_is_data_qos(hdr->frame_control))
115 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
116 else
117 tid = 0;
118
119 /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */
120 if (tid >= IWL_MAX_TID_COUNT)
121 return -1;
122
123 /* load pn */
124 pn[0] = extiv[7];
125 pn[1] = extiv[6];
126 pn[2] = extiv[5];
127 pn[3] = extiv[4];
128 pn[4] = extiv[1];
129 pn[5] = extiv[0];
130
131 if (memcmp(pn, ptk_pn->q[queue].pn[tid],
132 IEEE80211_CCMP_PN_LEN) <= 0)
133 return -1;
134
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 len -= pad_len;
154
155 /* If frame is small enough to fit in skb->head, pull it completely.
156 * If not, only pull ieee80211_hdr (including crypto if present, and
157 * an additional 8 bytes for SNAP/ethertype, see below) so that
158 * splice() or TCP coalesce are more efficient.
159 *
160 * Since, in addition, ieee80211_data_to_8023() always pull in at
161 * least 8 bytes (possibly more for mesh) we can do the same here
162 * to save the cost of doing it later. That still doesn't pull in
163 * the actual IP header since the typical case has a SNAP header.
164 * If the latter changes (there are efforts in the standards group
165 * to do so) we should revisit this and ieee80211_data_to_8023().
166 */
167 headlen = (len <= skb_tailroom(skb)) ? len :
168 hdrlen + crypt_len + 8;
169
170 /* The firmware may align the packet to DWORD.
171 * The padding is inserted after the IV.
172 * After copying the header + IV skip the padding if
173 * present before copying packet data.
174 */
175 hdrlen += crypt_len;
176 memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
177 memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len,
178 headlen - hdrlen);
179
180 fraglen = len - headlen;
181
182 if (fraglen) {
183 int offset = (void *)hdr + headlen + pad_len -
184 rxb_addr(rxb) + rxb_offset(rxb);
185
186 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
187 fraglen, rxb->truesize);
188 }
189 }
190
191 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
192 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
193 struct napi_struct *napi,
194 struct sk_buff *skb, int queue,
195 struct ieee80211_sta *sta)
196 {
197 if (iwl_mvm_check_pn(mvm, skb, queue, sta))
198 kfree_skb(skb);
199 else
200 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
201 }
202
203 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
204 struct iwl_rx_mpdu_desc *desc,
205 struct ieee80211_rx_status *rx_status)
206 {
207 int energy_a, energy_b, max_energy;
208
209 energy_a = desc->energy_a;
210 energy_a = energy_a ? -energy_a : S8_MIN;
211 energy_b = desc->energy_b;
212 energy_b = energy_b ? -energy_b : S8_MIN;
213 max_energy = max(energy_a, energy_b);
214
215 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
216 energy_a, energy_b, max_energy);
217
218 rx_status->signal = max_energy;
219 rx_status->chains = 0; /* TODO: phy info */
220 rx_status->chain_signal[0] = energy_a;
221 rx_status->chain_signal[1] = energy_b;
222 rx_status->chain_signal[2] = S8_MIN;
223 }
224
225 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
226 struct ieee80211_rx_status *stats,
227 struct iwl_rx_mpdu_desc *desc, int queue,
228 u8 *crypt_len)
229 {
230 u16 status = le16_to_cpu(desc->status);
231
232 if (!ieee80211_has_protected(hdr->frame_control) ||
233 (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
234 IWL_RX_MPDU_STATUS_SEC_NONE)
235 return 0;
236
237 /* TODO: handle packets encrypted with unknown alg */
238
239 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
240 case IWL_RX_MPDU_STATUS_SEC_CCM:
241 case IWL_RX_MPDU_STATUS_SEC_GCM:
242 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
243 /* alg is CCM: check MIC only */
244 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
245 return -1;
246
247 stats->flag |= RX_FLAG_DECRYPTED;
248 *crypt_len = IEEE80211_CCMP_HDR_LEN;
249 return 0;
250 case IWL_RX_MPDU_STATUS_SEC_TKIP:
251 /* Don't drop the frame and decrypt it in SW */
252 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
253 return 0;
254
255 *crypt_len = IEEE80211_TKIP_IV_LEN;
256 /* fall through if TTAK OK */
257 case IWL_RX_MPDU_STATUS_SEC_WEP:
258 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
259 return -1;
260
261 stats->flag |= RX_FLAG_DECRYPTED;
262 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
263 IWL_RX_MPDU_STATUS_SEC_WEP)
264 *crypt_len = IEEE80211_WEP_IV_LEN;
265 return 0;
266 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
267 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
268 return -1;
269 stats->flag |= RX_FLAG_DECRYPTED;
270 return 0;
271 default:
272 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
273 }
274
275 return 0;
276 }
277
278 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
279 struct sk_buff *skb,
280 struct iwl_rx_mpdu_desc *desc)
281 {
282 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
283 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
284 u16 flags = le16_to_cpu(desc->l3l4_flags);
285 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
286 IWL_RX_L3_PROTO_POS);
287
288 if (mvmvif->features & NETIF_F_RXCSUM &&
289 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
290 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
291 l3_prot == IWL_RX_L3_TYPE_IPV6 ||
292 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
293 skb->ip_summed = CHECKSUM_UNNECESSARY;
294 }
295
296 /*
297 * returns true if a packet outside BA session is a duplicate and
298 * should be dropped
299 */
300 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
301 struct ieee80211_rx_status *rx_status,
302 struct ieee80211_hdr *hdr,
303 struct iwl_rx_mpdu_desc *desc)
304 {
305 struct iwl_mvm_sta *mvm_sta;
306 struct iwl_mvm_rxq_dup_data *dup_data;
307 u8 baid, tid, sub_frame_idx;
308
309 if (WARN_ON(IS_ERR_OR_NULL(sta)))
310 return false;
311
312 baid = (le32_to_cpu(desc->reorder_data) &
313 IWL_RX_MPDU_REORDER_BAID_MASK) >>
314 IWL_RX_MPDU_REORDER_BAID_SHIFT;
315
316 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
317 return false;
318
319 mvm_sta = iwl_mvm_sta_from_mac80211(sta);
320 dup_data = &mvm_sta->dup_data[queue];
321
322 /*
323 * Drop duplicate 802.11 retransmissions
324 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
325 */
326 if (ieee80211_is_ctl(hdr->frame_control) ||
327 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
328 is_multicast_ether_addr(hdr->addr1)) {
329 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
330 return false;
331 }
332
333 if (ieee80211_is_data_qos(hdr->frame_control))
334 /* frame has qos control */
335 tid = *ieee80211_get_qos_ctl(hdr) &
336 IEEE80211_QOS_CTL_TID_MASK;
337 else
338 tid = IWL_MAX_TID_COUNT;
339
340 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
341 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
342
343 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
344 dup_data->last_seq[tid] == hdr->seq_ctrl &&
345 dup_data->last_sub_frame[tid] >= sub_frame_idx))
346 return true;
347
348 dup_data->last_seq[tid] = hdr->seq_ctrl;
349 dup_data->last_sub_frame[tid] = sub_frame_idx;
350
351 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
352
353 return false;
354 }
355
356 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
357 const u8 *data, u32 count)
358 {
359 struct iwl_rxq_sync_cmd *cmd;
360 u32 data_size = sizeof(*cmd) + count;
361 int ret;
362
363 /* should be DWORD aligned */
364 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
365 return -EINVAL;
366
367 cmd = kzalloc(data_size, GFP_KERNEL);
368 if (!cmd)
369 return -ENOMEM;
370
371 cmd->rxq_mask = cpu_to_le32(rxq_mask);
372 cmd->count = cpu_to_le32(count);
373 cmd->flags = 0;
374 memcpy(cmd->payload, data, count);
375
376 ret = iwl_mvm_send_cmd_pdu(mvm,
377 WIDE_ID(DATA_PATH_GROUP,
378 TRIGGER_RX_QUEUES_NOTIF_CMD),
379 0, data_size, cmd);
380
381 kfree(cmd);
382 return ret;
383 }
384
385 /*
386 * Returns true if sn2 - buffer_size < sn1 < sn2.
387 * To be used only in order to compare reorder buffer head with NSSN.
388 * We fully trust NSSN unless it is behind us due to reorder timeout.
389 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
390 */
391 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
392 {
393 return ieee80211_sn_less(sn1, sn2) &&
394 !ieee80211_sn_less(sn1, sn2 - buffer_size);
395 }
396
397 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
398
399 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
400 struct ieee80211_sta *sta,
401 struct napi_struct *napi,
402 struct iwl_mvm_reorder_buffer *reorder_buf,
403 u16 nssn)
404 {
405 u16 ssn = reorder_buf->head_sn;
406
407 lockdep_assert_held(&reorder_buf->lock);
408
409 /* ignore nssn smaller than head sn - this can happen due to timeout */
410 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
411 return;
412
413 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
414 int index = ssn % reorder_buf->buf_size;
415 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
416 struct sk_buff *skb;
417
418 ssn = ieee80211_sn_inc(ssn);
419
420 /* holes are valid since nssn indicates frames were received. */
421 if (skb_queue_empty(skb_list) || !skb_peek_tail(skb_list))
422 continue;
423 /* Empty the list. Will have more than one frame for A-MSDU */
424 while ((skb = __skb_dequeue(skb_list))) {
425 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
426 reorder_buf->queue,
427 sta);
428 reorder_buf->num_stored--;
429 }
430 }
431 reorder_buf->head_sn = nssn;
432
433 if (reorder_buf->num_stored && !reorder_buf->removed) {
434 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
435
436 while (!skb_peek_tail(&reorder_buf->entries[index]))
437 index = (index + 1) % reorder_buf->buf_size;
438 /* modify timer to match next frame's expiration time */
439 mod_timer(&reorder_buf->reorder_timer,
440 reorder_buf->reorder_time[index] + 1 +
441 RX_REORDER_BUF_TIMEOUT_MQ);
442 } else {
443 del_timer(&reorder_buf->reorder_timer);
444 }
445 }
446
447 void iwl_mvm_reorder_timer_expired(unsigned long data)
448 {
449 struct iwl_mvm_reorder_buffer *buf = (void *)data;
450 int i;
451 u16 sn = 0, index = 0;
452 bool expired = false;
453
454 spin_lock_bh(&buf->lock);
455
456 if (!buf->num_stored || buf->removed) {
457 spin_unlock_bh(&buf->lock);
458 return;
459 }
460
461 for (i = 0; i < buf->buf_size ; i++) {
462 index = (buf->head_sn + i) % buf->buf_size;
463
464 if (!skb_peek_tail(&buf->entries[index]))
465 continue;
466 if (!time_after(jiffies, buf->reorder_time[index] +
467 RX_REORDER_BUF_TIMEOUT_MQ))
468 break;
469 expired = true;
470 sn = ieee80211_sn_add(buf->head_sn, i + 1);
471 }
472
473 if (expired) {
474 struct ieee80211_sta *sta;
475
476 rcu_read_lock();
477 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
478 /* SN is set to the last expired frame + 1 */
479 IWL_DEBUG_HT(buf->mvm,
480 "Releasing expired frames for sta %u, sn %d\n",
481 buf->sta_id, sn);
482 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
483 rcu_read_unlock();
484 } else if (buf->num_stored) {
485 /*
486 * If no frame expired and there are stored frames, index is now
487 * pointing to the first unexpired frame - modify timer
488 * accordingly to this frame.
489 */
490 mod_timer(&buf->reorder_timer,
491 buf->reorder_time[index] +
492 1 + RX_REORDER_BUF_TIMEOUT_MQ);
493 }
494 spin_unlock_bh(&buf->lock);
495 }
496
497 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
498 struct iwl_mvm_delba_data *data)
499 {
500 struct iwl_mvm_baid_data *ba_data;
501 struct ieee80211_sta *sta;
502 struct iwl_mvm_reorder_buffer *reorder_buf;
503 u8 baid = data->baid;
504
505 if (WARN_ON_ONCE(baid >= IWL_RX_REORDER_DATA_INVALID_BAID))
506 return;
507
508 rcu_read_lock();
509
510 ba_data = rcu_dereference(mvm->baid_map[baid]);
511 if (WARN_ON_ONCE(!ba_data))
512 goto out;
513
514 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
515 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
516 goto out;
517
518 reorder_buf = &ba_data->reorder_buf[queue];
519
520 /* release all frames that are in the reorder buffer to the stack */
521 spin_lock_bh(&reorder_buf->lock);
522 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
523 ieee80211_sn_add(reorder_buf->head_sn,
524 reorder_buf->buf_size));
525 spin_unlock_bh(&reorder_buf->lock);
526 del_timer_sync(&reorder_buf->reorder_timer);
527
528 out:
529 rcu_read_unlock();
530 }
531
532 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
533 int queue)
534 {
535 struct iwl_rx_packet *pkt = rxb_addr(rxb);
536 struct iwl_rxq_sync_notification *notif;
537 struct iwl_mvm_internal_rxq_notif *internal_notif;
538
539 notif = (void *)pkt->data;
540 internal_notif = (void *)notif->payload;
541
542 if (internal_notif->sync) {
543 if (mvm->queue_sync_cookie != internal_notif->cookie) {
544 WARN_ONCE(1,
545 "Received expired RX queue sync message\n");
546 return;
547 }
548 atomic_dec(&mvm->queue_sync_counter);
549 }
550
551 switch (internal_notif->type) {
552 case IWL_MVM_RXQ_EMPTY:
553 break;
554 case IWL_MVM_RXQ_NOTIF_DEL_BA:
555 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
556 break;
557 default:
558 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
559 }
560 }
561
562 /*
563 * Returns true if the MPDU was buffered\dropped, false if it should be passed
564 * to upper layer.
565 */
566 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
567 struct napi_struct *napi,
568 int queue,
569 struct ieee80211_sta *sta,
570 struct sk_buff *skb,
571 struct iwl_rx_mpdu_desc *desc)
572 {
573 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
574 struct iwl_mvm_sta *mvm_sta;
575 struct iwl_mvm_baid_data *baid_data;
576 struct iwl_mvm_reorder_buffer *buffer;
577 struct sk_buff *tail;
578 u32 reorder = le32_to_cpu(desc->reorder_data);
579 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
580 bool last_subframe =
581 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
582 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
583 u8 sub_frame_idx = desc->amsdu_info &
584 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
585 int index;
586 u16 nssn, sn;
587 u8 baid;
588
589 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
590 IWL_RX_MPDU_REORDER_BAID_SHIFT;
591
592 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
593 return false;
594
595 /* no sta yet */
596 if (WARN_ON(IS_ERR_OR_NULL(sta)))
597 return false;
598
599 mvm_sta = iwl_mvm_sta_from_mac80211(sta);
600
601 /* not a data packet */
602 if (!ieee80211_is_data_qos(hdr->frame_control) ||
603 is_multicast_ether_addr(hdr->addr1))
604 return false;
605
606 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
607 return false;
608
609 baid_data = rcu_dereference(mvm->baid_map[baid]);
610 if (WARN(!baid_data,
611 "Received baid %d, but no data exists for this BAID\n", baid))
612 return false;
613 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
614 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
615 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
616 tid))
617 return false;
618
619 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
620 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
621 IWL_RX_MPDU_REORDER_SN_SHIFT;
622
623 buffer = &baid_data->reorder_buf[queue];
624
625 spin_lock_bh(&buffer->lock);
626
627 /*
628 * If there was a significant jump in the nssn - adjust.
629 * If the SN is smaller than the NSSN it might need to first go into
630 * the reorder buffer, in which case we just release up to it and the
631 * rest of the function will take of storing it and releasing up to the
632 * nssn
633 */
634 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
635 buffer->buf_size)) {
636 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
637
638 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
639 }
640
641 /* drop any oudated packets */
642 if (ieee80211_sn_less(sn, buffer->head_sn))
643 goto drop;
644
645 /* release immediately if allowed by nssn and no stored frames */
646 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
647 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
648 buffer->buf_size) &&
649 (!amsdu || last_subframe))
650 buffer->head_sn = nssn;
651 /* No need to update AMSDU last SN - we are moving the head */
652 spin_unlock_bh(&buffer->lock);
653 return false;
654 }
655
656 index = sn % buffer->buf_size;
657
658 /*
659 * Check if we already stored this frame
660 * As AMSDU is either received or not as whole, logic is simple:
661 * If we have frames in that position in the buffer and the last frame
662 * originated from AMSDU had a different SN then it is a retransmission.
663 * If it is the same SN then if the subframe index is incrementing it
664 * is the same AMSDU - otherwise it is a retransmission.
665 */
666 tail = skb_peek_tail(&buffer->entries[index]);
667 if (tail && !amsdu)
668 goto drop;
669 else if (tail && (sn != buffer->last_amsdu ||
670 buffer->last_sub_index >= sub_frame_idx))
671 goto drop;
672
673 /* put in reorder buffer */
674 __skb_queue_tail(&buffer->entries[index], skb);
675 buffer->num_stored++;
676 buffer->reorder_time[index] = jiffies;
677
678 if (amsdu) {
679 buffer->last_amsdu = sn;
680 buffer->last_sub_index = sub_frame_idx;
681 }
682
683 /*
684 * We cannot trust NSSN for AMSDU sub-frames that are not the last.
685 * The reason is that NSSN advances on the first sub-frame, and may
686 * cause the reorder buffer to advance before all the sub-frames arrive.
687 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
688 * SN 1. NSSN for first sub frame will be 3 with the result of driver
689 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
690 * already ahead and it will be dropped.
691 * If the last sub-frame is not on this queue - we will get frame
692 * release notification with up to date NSSN.
693 */
694 if (!amsdu || last_subframe)
695 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
696
697 spin_unlock_bh(&buffer->lock);
698 return true;
699
700 drop:
701 kfree_skb(skb);
702 spin_unlock_bh(&buffer->lock);
703 return true;
704 }
705
706 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid)
707 {
708 unsigned long now = jiffies;
709 unsigned long timeout;
710 struct iwl_mvm_baid_data *data;
711
712 rcu_read_lock();
713
714 data = rcu_dereference(mvm->baid_map[baid]);
715 if (WARN_ON(!data))
716 goto out;
717
718 if (!data->timeout)
719 goto out;
720
721 timeout = data->timeout;
722 /*
723 * Do not update last rx all the time to avoid cache bouncing
724 * between the rx queues.
725 * Update it every timeout. Worst case is the session will
726 * expire after ~ 2 * timeout, which doesn't matter that much.
727 */
728 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
729 /* Update is atomic */
730 data->last_rx = now;
731
732 out:
733 rcu_read_unlock();
734 }
735
736 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
737 struct iwl_rx_cmd_buffer *rxb, int queue)
738 {
739 struct ieee80211_rx_status *rx_status;
740 struct iwl_rx_packet *pkt = rxb_addr(rxb);
741 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
742 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
743 u32 len = le16_to_cpu(desc->mpdu_len);
744 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
745 u16 phy_info = le16_to_cpu(desc->phy_info);
746 struct ieee80211_sta *sta = NULL;
747 struct sk_buff *skb;
748 u8 crypt_len = 0;
749
750 /* Dont use dev_alloc_skb(), we'll have enough headroom once
751 * ieee80211_hdr pulled.
752 */
753 skb = alloc_skb(128, GFP_ATOMIC);
754 if (!skb) {
755 IWL_ERR(mvm, "alloc_skb failed\n");
756 return;
757 }
758
759 rx_status = IEEE80211_SKB_RXCB(skb);
760
761 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
762 kfree_skb(skb);
763 return;
764 }
765
766 /*
767 * Keep packets with CRC errors (and with overrun) for monitor mode
768 * (otherwise the firmware discards them) but mark them as bad.
769 */
770 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
771 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
772 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
773 le16_to_cpu(desc->status));
774 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
775 }
776 /* set the preamble flag if appropriate */
777 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
778 rx_status->flag |= RX_FLAG_SHORTPRE;
779
780 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
781 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
782 /* TSF as indicated by the firmware is at INA time */
783 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
784 }
785 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
786 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
787 NL80211_BAND_2GHZ;
788 rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
789 rx_status->band);
790 iwl_mvm_get_signal_strength(mvm, desc, rx_status);
791
792 /* update aggregation data for monitor sake on default queue */
793 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
794 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
795
796 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
797 rx_status->ampdu_reference = mvm->ampdu_ref;
798 /* toggle is switched whenever new aggregation starts */
799 if (toggle_bit != mvm->ampdu_toggle) {
800 mvm->ampdu_ref++;
801 mvm->ampdu_toggle = toggle_bit;
802 }
803 }
804
805 rcu_read_lock();
806
807 if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) {
808 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
809
810 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
811 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
812 if (IS_ERR(sta))
813 sta = NULL;
814 }
815 } else if (!is_multicast_ether_addr(hdr->addr2)) {
816 /*
817 * This is fine since we prevent two stations with the same
818 * address from being added.
819 */
820 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
821 }
822
823 if (sta) {
824 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
825 struct ieee80211_vif *tx_blocked_vif =
826 rcu_dereference(mvm->csa_tx_blocked_vif);
827 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
828 IWL_RX_MPDU_REORDER_BAID_MASK) >>
829 IWL_RX_MPDU_REORDER_BAID_SHIFT);
830
831 /*
832 * We have tx blocked stations (with CS bit). If we heard
833 * frames from a blocked station on a new channel we can
834 * TX to it again.
835 */
836 if (unlikely(tx_blocked_vif) &&
837 tx_blocked_vif == mvmsta->vif) {
838 struct iwl_mvm_vif *mvmvif =
839 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
840
841 if (mvmvif->csa_target_freq == rx_status->freq)
842 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
843 false);
844 }
845
846 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
847
848 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
849 ieee80211_is_beacon(hdr->frame_control)) {
850 struct iwl_fw_dbg_trigger_tlv *trig;
851 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
852 bool trig_check;
853 s32 rssi;
854
855 trig = iwl_fw_dbg_get_trigger(mvm->fw,
856 FW_DBG_TRIGGER_RSSI);
857 rssi_trig = (void *)trig->data;
858 rssi = le32_to_cpu(rssi_trig->rssi);
859
860 trig_check =
861 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
862 trig);
863 if (trig_check && rx_status->signal < rssi)
864 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
865 }
866
867 if (ieee80211_is_data(hdr->frame_control))
868 iwl_mvm_rx_csum(sta, skb, desc);
869
870 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
871 kfree_skb(skb);
872 rcu_read_unlock();
873 return;
874 }
875
876 /*
877 * Our hardware de-aggregates AMSDUs but copies the mac header
878 * as it to the de-aggregated MPDUs. We need to turn off the
879 * AMSDU bit in the QoS control ourselves.
880 */
881 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
882 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
883 u8 *qc = ieee80211_get_qos_ctl(hdr);
884
885 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
886 }
887 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
888 iwl_mvm_agg_rx_received(mvm, baid);
889 }
890
891 /* Set up the HT phy flags */
892 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
893 case RATE_MCS_CHAN_WIDTH_20:
894 break;
895 case RATE_MCS_CHAN_WIDTH_40:
896 rx_status->flag |= RX_FLAG_40MHZ;
897 break;
898 case RATE_MCS_CHAN_WIDTH_80:
899 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
900 break;
901 case RATE_MCS_CHAN_WIDTH_160:
902 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
903 break;
904 }
905 if (rate_n_flags & RATE_MCS_SGI_MSK)
906 rx_status->flag |= RX_FLAG_SHORT_GI;
907 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
908 rx_status->flag |= RX_FLAG_HT_GF;
909 if (rate_n_flags & RATE_MCS_LDPC_MSK)
910 rx_status->flag |= RX_FLAG_LDPC;
911 if (rate_n_flags & RATE_MCS_HT_MSK) {
912 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
913 RATE_MCS_STBC_POS;
914 rx_status->flag |= RX_FLAG_HT;
915 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
916 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
917 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
918 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
919 RATE_MCS_STBC_POS;
920 rx_status->vht_nss =
921 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
922 RATE_VHT_MCS_NSS_POS) + 1;
923 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
924 rx_status->flag |= RX_FLAG_VHT;
925 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
926 if (rate_n_flags & RATE_MCS_BF_MSK)
927 rx_status->vht_flag |= RX_VHT_FLAG_BF;
928 } else {
929 rx_status->rate_idx =
930 iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
931 rx_status->band);
932 }
933
934 /* management stuff on default queue */
935 if (!queue) {
936 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
937 ieee80211_is_probe_resp(hdr->frame_control)) &&
938 mvm->sched_scan_pass_all ==
939 SCHED_SCAN_PASS_ALL_ENABLED))
940 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
941
942 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
943 ieee80211_is_probe_resp(hdr->frame_control)))
944 rx_status->boottime_ns = ktime_get_boot_ns();
945 }
946
947 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
948 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
949 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
950 rcu_read_unlock();
951 }
952
953 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
954 struct iwl_rx_cmd_buffer *rxb, int queue)
955 {
956 struct iwl_rx_packet *pkt = rxb_addr(rxb);
957 struct iwl_frame_release *release = (void *)pkt->data;
958 struct ieee80211_sta *sta;
959 struct iwl_mvm_reorder_buffer *reorder_buf;
960 struct iwl_mvm_baid_data *ba_data;
961
962 int baid = release->baid;
963
964 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
965 release->baid, le16_to_cpu(release->nssn));
966
967 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
968 return;
969
970 rcu_read_lock();
971
972 ba_data = rcu_dereference(mvm->baid_map[baid]);
973 if (WARN_ON_ONCE(!ba_data))
974 goto out;
975
976 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
977 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
978 goto out;
979
980 reorder_buf = &ba_data->reorder_buf[queue];
981
982 spin_lock_bh(&reorder_buf->lock);
983 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
984 le16_to_cpu(release->nssn));
985 spin_unlock_bh(&reorder_buf->lock);
986
987 out:
988 rcu_read_unlock();
989 }
Linux kernel - Deliverables
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