1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3 * Copyright (C) 2024-2026 Intel Corporation
4 */
5 #include "agg.h"
6 #include "sta.h"
7 #include "hcmd.h"
8
9 static void
iwl_mld_reorder_release_frames(struct iwl_mld * mld,struct ieee80211_sta * sta,struct napi_struct * napi,struct iwl_mld_baid_data * baid_data,struct iwl_mld_reorder_buffer * reorder_buf,u16 nssn)10 iwl_mld_reorder_release_frames(struct iwl_mld *mld, struct ieee80211_sta *sta,
11 struct napi_struct *napi,
12 struct iwl_mld_baid_data *baid_data,
13 struct iwl_mld_reorder_buffer *reorder_buf,
14 u16 nssn)
15 {
16 struct iwl_mld_reorder_buf_entry *entries =
17 &baid_data->entries[reorder_buf->queue *
18 baid_data->entries_per_queue];
19 u16 ssn = reorder_buf->head_sn;
20
21 while (ieee80211_sn_less(ssn, nssn)) {
22 int index = ssn % baid_data->buf_size;
23 struct sk_buff_head *skb_list = &entries[index].frames;
24 struct sk_buff *skb;
25
26 ssn = ieee80211_sn_inc(ssn);
27
28 /* Empty the list. Will have more than one frame for A-MSDU.
29 * Empty list is valid as well since nssn indicates frames were
30 * received.
31 */
32 while ((skb = __skb_dequeue(skb_list))) {
33 iwl_mld_pass_packet_to_mac80211(mld, napi, skb,
34 reorder_buf->queue,
35 sta);
36 reorder_buf->num_stored--;
37 }
38 }
39 reorder_buf->head_sn = nssn;
40 }
41
iwl_mld_release_frames_from_notif(struct iwl_mld * mld,struct napi_struct * napi,u8 baid,u16 nssn,int queue)42 static void iwl_mld_release_frames_from_notif(struct iwl_mld *mld,
43 struct napi_struct *napi,
44 u8 baid, u16 nssn, int queue)
45 {
46 struct iwl_mld_reorder_buffer *reorder_buf;
47 struct iwl_mld_baid_data *ba_data;
48 struct ieee80211_link_sta *link_sta;
49 u32 sta_id;
50
51 IWL_DEBUG_HT(mld, "Frame release notification for BAID %u, NSSN %d\n",
52 baid, nssn);
53
54 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID ||
55 baid >= ARRAY_SIZE(mld->fw_id_to_ba)))
56 return;
57
58 rcu_read_lock();
59
60 ba_data = rcu_dereference(mld->fw_id_to_ba[baid]);
61 if (!ba_data) {
62 IWL_DEBUG_HT(mld, "BAID %d not found in map\n", baid);
63 goto out_unlock;
64 }
65
66 /* pick any STA ID to find the pointer */
67 if (WARN_ON_ONCE(!ba_data->sta_mask))
68 goto out_unlock;
69
70 sta_id = ffs(ba_data->sta_mask) - 1;
71 link_sta = rcu_dereference(mld->fw_id_to_link_sta[sta_id]);
72 if (WARN_ON_ONCE(IS_ERR_OR_NULL(link_sta) || !link_sta->sta))
73 goto out_unlock;
74
75 reorder_buf = &ba_data->reorder_buf[queue];
76
77 iwl_mld_reorder_release_frames(mld, link_sta->sta, napi, ba_data,
78 reorder_buf, nssn);
79 out_unlock:
80 rcu_read_unlock();
81 }
82
iwl_mld_handle_frame_release_notif(struct iwl_mld * mld,struct napi_struct * napi,struct iwl_rx_packet * pkt,int queue)83 void iwl_mld_handle_frame_release_notif(struct iwl_mld *mld,
84 struct napi_struct *napi,
85 struct iwl_rx_packet *pkt, int queue)
86 {
87 struct iwl_frame_release *release = (void *)pkt->data;
88 u32 pkt_len = iwl_rx_packet_payload_len(pkt);
89
90 if (IWL_FW_CHECK(mld, pkt_len < sizeof(*release),
91 "Unexpected frame release notif size %u (expected %zu)\n",
92 pkt_len, sizeof(*release)))
93 return;
94
95 iwl_mld_release_frames_from_notif(mld, napi, release->baid,
96 le16_to_cpu(release->nssn),
97 queue);
98 }
99
iwl_mld_handle_bar_frame_release_notif(struct iwl_mld * mld,struct napi_struct * napi,struct iwl_rx_packet * pkt,int queue)100 void iwl_mld_handle_bar_frame_release_notif(struct iwl_mld *mld,
101 struct napi_struct *napi,
102 struct iwl_rx_packet *pkt,
103 int queue)
104 {
105 struct iwl_bar_frame_release *release = (void *)pkt->data;
106 struct iwl_mld_baid_data *baid_data;
107 unsigned int baid, nssn, sta_id, tid;
108 u32 pkt_len = iwl_rx_packet_payload_len(pkt);
109
110 if (IWL_FW_CHECK(mld, pkt_len < sizeof(*release),
111 "Unexpected frame release notif size %u (expected %zu)\n",
112 pkt_len, sizeof(*release)))
113 return;
114
115 baid = le32_get_bits(release->ba_info,
116 IWL_BAR_FRAME_RELEASE_BAID_MASK);
117 nssn = le32_get_bits(release->ba_info,
118 IWL_BAR_FRAME_RELEASE_NSSN_MASK);
119 sta_id = le32_get_bits(release->sta_tid,
120 IWL_BAR_FRAME_RELEASE_STA_MASK);
121 tid = le32_get_bits(release->sta_tid,
122 IWL_BAR_FRAME_RELEASE_TID_MASK);
123
124 if (IWL_FW_CHECK(mld, baid >= ARRAY_SIZE(mld->fw_id_to_ba),
125 "BAR release: invalid BAID (%x)\n", baid))
126 return;
127
128 rcu_read_lock();
129 baid_data = rcu_dereference(mld->fw_id_to_ba[baid]);
130 if (!baid_data) {
131 IWL_DEBUG_HT(mld,
132 "Got valid BAID %d but not allocated\n",
133 baid);
134 goto out_unlock;
135 }
136
137 if (IWL_FW_CHECK(mld, tid != baid_data->tid ||
138 sta_id > mld->fw->ucode_capa.num_stations ||
139 !(baid_data->sta_mask & BIT(sta_id)),
140 "BAID 0x%x is mapped to sta_mask:0x%x tid:%d, but BAR release received for sta:%d tid:%d\n",
141 baid, baid_data->sta_mask, baid_data->tid, sta_id,
142 tid))
143 goto out_unlock;
144
145 IWL_DEBUG_DROP(mld, "Received a BAR, expect packet loss: nssn %d\n",
146 nssn);
147
148 iwl_mld_release_frames_from_notif(mld, napi, baid, nssn, queue);
149 out_unlock:
150 rcu_read_unlock();
151 }
152
iwl_mld_del_ba(struct iwl_mld * mld,int queue,struct iwl_mld_delba_data * data)153 void iwl_mld_del_ba(struct iwl_mld *mld, int queue,
154 struct iwl_mld_delba_data *data)
155 {
156 struct iwl_mld_baid_data *ba_data;
157 struct iwl_mld_reorder_buffer *reorder_buf;
158 struct ieee80211_link_sta *link_sta;
159 u8 baid = data->baid;
160 u32 sta_id;
161
162 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid))
163 return;
164
165 rcu_read_lock();
166
167 ba_data = rcu_dereference(mld->fw_id_to_ba[baid]);
168 if (WARN_ON_ONCE(!ba_data))
169 goto out_unlock;
170
171 /* pick any STA ID to find the pointer */
172 if (WARN_ON_ONCE(!ba_data->sta_mask))
173 goto out_unlock;
174
175 sta_id = ffs(ba_data->sta_mask) - 1;
176 link_sta = rcu_dereference(mld->fw_id_to_link_sta[sta_id]);
177 if (WARN_ON_ONCE(IS_ERR_OR_NULL(link_sta) || !link_sta->sta))
178 goto out_unlock;
179
180 reorder_buf = &ba_data->reorder_buf[queue];
181
182 /* release all frames that are in the reorder buffer to the stack */
183 iwl_mld_reorder_release_frames(mld, link_sta->sta, NULL,
184 ba_data, reorder_buf,
185 ieee80211_sn_add(reorder_buf->head_sn,
186 ba_data->buf_size));
187 out_unlock:
188 rcu_read_unlock();
189 }
190
191 /* Returns true if the MPDU was buffered\dropped, false if it should be passed
192 * to upper layer.
193 */
194 enum iwl_mld_reorder_result
iwl_mld_reorder(struct iwl_mld * mld,struct napi_struct * napi,int queue,struct ieee80211_sta * sta,struct sk_buff * skb,struct iwl_rx_mpdu_desc * desc)195 iwl_mld_reorder(struct iwl_mld *mld, struct napi_struct *napi,
196 int queue, struct ieee80211_sta *sta,
197 struct sk_buff *skb, struct iwl_rx_mpdu_desc *desc)
198 {
199 struct ieee80211_hdr *hdr = (void *)skb_mac_header(skb);
200 struct iwl_mld_baid_data *baid_data;
201 struct iwl_mld_reorder_buffer *buffer;
202 struct iwl_mld_reorder_buf_entry *entries;
203 struct iwl_mld_link_sta *mld_link_sta;
204 u32 reorder = le32_to_cpu(desc->reorder_data);
205 bool amsdu, last_subframe, is_old_sn, is_dup;
206 u8 tid = ieee80211_get_tid(hdr);
207 struct iwl_mld_sta *mld_sta;
208 u8 baid;
209 u16 nssn, sn;
210 u32 sta_mask = 0;
211 int index;
212 u8 link_id;
213
214 baid = u32_get_bits(reorder, IWL_RX_MPDU_REORDER_BAID_MASK);
215
216 /* This also covers the case of receiving a Block Ack Request
217 * outside a BA session; we'll pass it to mac80211 and that
218 * then sends a delBA action frame.
219 * This also covers pure monitor mode, in which case we won't
220 * have any BA sessions.
221 */
222 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
223 return IWL_MLD_PASS_SKB;
224
225 if (IWL_FW_CHECK(mld, baid >= ARRAY_SIZE(mld->fw_id_to_ba),
226 "Got out-of-range BAID %u in reorder_data=0x%x\n",
227 baid, reorder))
228 return IWL_MLD_PASS_SKB;
229
230 /* no sta yet */
231 if (IWL_FW_CHECK(mld, !sta,
232 "Got valid BAID without a valid station assigned - %d\n",
233 baid))
234 return IWL_MLD_PASS_SKB;
235
236 mld_sta = iwl_mld_sta_from_mac80211(sta);
237
238 /* not a data packet */
239 if (!ieee80211_is_data_qos(hdr->frame_control) ||
240 is_multicast_ether_addr(hdr->addr1))
241 return IWL_MLD_PASS_SKB;
242
243 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
244 return IWL_MLD_PASS_SKB;
245
246 baid_data = rcu_dereference(mld->fw_id_to_ba[baid]);
247 if (!baid_data) {
248 IWL_DEBUG_HT(mld,
249 "Got valid BAID but no baid allocated, bypass re-ordering (BAID=%d reorder=0x%x)\n",
250 baid, reorder);
251 return IWL_MLD_PASS_SKB;
252 }
253
254 for_each_mld_link_sta(mld_sta, mld_link_sta, link_id)
255 sta_mask |= BIT(mld_link_sta->fw_id);
256
257 /* verify the BAID is correctly mapped to the sta and tid */
258 if (IWL_FW_CHECK(mld,
259 tid != baid_data->tid ||
260 !(sta_mask & baid_data->sta_mask),
261 "BAID 0x%x is mapped to sta_mask:0x%x tid:%d, but was received for sta_mask:0x%x tid:%d\n",
262 baid, baid_data->sta_mask, baid_data->tid,
263 sta_mask, tid))
264 return IWL_MLD_PASS_SKB;
265
266 buffer = &baid_data->reorder_buf[queue];
267 entries = &baid_data->entries[queue * baid_data->entries_per_queue];
268
269 is_old_sn = !!(reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN);
270
271 if (!buffer->valid && is_old_sn)
272 return IWL_MLD_PASS_SKB;
273
274 buffer->valid = true;
275
276 is_dup = !!(desc->status & cpu_to_le32(IWL_RX_MPDU_STATUS_DUPLICATE));
277
278 /* drop any duplicated or outdated packets */
279 if (is_dup || is_old_sn)
280 return IWL_MLD_DROP_SKB;
281
282 sn = u32_get_bits(reorder, IWL_RX_MPDU_REORDER_SN_MASK);
283 nssn = u32_get_bits(reorder, IWL_RX_MPDU_REORDER_NSSN_MASK);
284 amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
285 last_subframe = desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
286
287 /* release immediately if allowed by nssn and no stored frames */
288 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
289 if (!amsdu || last_subframe)
290 buffer->head_sn = nssn;
291 return IWL_MLD_PASS_SKB;
292 }
293
294 /* release immediately if there are no stored frames, and the sn is
295 * equal to the head.
296 * This can happen due to reorder timer, where NSSN is behind head_sn.
297 * When we released everything, and we got the next frame in the
298 * sequence, according to the NSSN we can't release immediately,
299 * while technically there is no hole and we can move forward.
300 */
301 if (!buffer->num_stored && sn == buffer->head_sn) {
302 if (!amsdu || last_subframe)
303 buffer->head_sn = ieee80211_sn_inc(buffer->head_sn);
304 return IWL_MLD_PASS_SKB;
305 }
306
307 /* put in reorder buffer */
308 index = sn % baid_data->buf_size;
309 __skb_queue_tail(&entries[index].frames, skb);
310 buffer->num_stored++;
311
312 /* We cannot trust NSSN for AMSDU sub-frames that are not the last. The
313 * reason is that NSSN advances on the first sub-frame, and may cause
314 * the reorder buffer to advance before all the sub-frames arrive.
315 *
316 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
317 * SN 1. NSSN for first sub frame will be 3 with the result of driver
318 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
319 * already ahead and it will be dropped.
320 * If the last sub-frame is not on this queue - we will get frame
321 * release notification with up to date NSSN.
322 * If this is the first frame that is stored in the buffer, the head_sn
323 * may be outdated. Update it based on the last NSSN to make sure it
324 * will be released when the frame release notification arrives.
325 */
326 if (!amsdu || last_subframe)
327 iwl_mld_reorder_release_frames(mld, sta, napi, baid_data,
328 buffer, nssn);
329 else if (buffer->num_stored == 1)
330 buffer->head_sn = nssn;
331
332 return IWL_MLD_BUFFERED_SKB;
333 }
334 EXPORT_SYMBOL_IF_IWLWIFI_KUNIT(iwl_mld_reorder);
335
iwl_mld_rx_agg_session_expired(struct timer_list * t)336 static void iwl_mld_rx_agg_session_expired(struct timer_list *t)
337 {
338 struct iwl_mld_baid_data *data =
339 timer_container_of(data, t, session_timer);
340 struct iwl_mld_baid_data __rcu **rcu_ptr = data->rcu_ptr;
341 struct iwl_mld_baid_data *ba_data;
342 struct ieee80211_link_sta *link_sta;
343 struct iwl_mld_sta *mld_sta;
344 unsigned long timeout;
345 unsigned int sta_id;
346
347 rcu_read_lock();
348
349 ba_data = rcu_dereference(*rcu_ptr);
350 if (WARN_ON(!ba_data))
351 goto unlock;
352
353 if (WARN_ON(!ba_data->timeout))
354 goto unlock;
355
356 timeout = ba_data->last_rx_timestamp +
357 TU_TO_JIFFIES(ba_data->timeout * 2);
358 if (time_is_after_jiffies(timeout)) {
359 mod_timer(&ba_data->session_timer, timeout);
360 goto unlock;
361 }
362
363 /* timer expired, pick any STA ID to find the pointer */
364 if (WARN_ON_ONCE(!ba_data->sta_mask))
365 goto unlock;
366
367 sta_id = ffs(ba_data->sta_mask) - 1;
368 link_sta = rcu_dereference(ba_data->mld->fw_id_to_link_sta[sta_id]);
369
370 /* sta should be valid unless the following happens:
371 * The firmware asserts which triggers a reconfig flow, but
372 * the reconfig fails before we set the pointer to sta into
373 * the fw_id_to_link_sta pointer table. mac80211 can't stop
374 * A-MPDU and hence the timer continues to run. Then, the
375 * timer expires and sta is NULL.
376 */
377 if (IS_ERR_OR_NULL(link_sta) || WARN_ON(!link_sta->sta))
378 goto unlock;
379
380 mld_sta = iwl_mld_sta_from_mac80211(link_sta->sta);
381 ieee80211_rx_ba_timer_expired(mld_sta->vif, link_sta->sta->addr,
382 ba_data->tid);
383 unlock:
384 rcu_read_unlock();
385 }
386
387 static int
iwl_mld_stop_ba_in_fw(struct iwl_mld * mld,struct ieee80211_sta * sta,int tid)388 iwl_mld_stop_ba_in_fw(struct iwl_mld *mld, struct ieee80211_sta *sta, int tid)
389 {
390 struct iwl_rx_baid_cfg_cmd cmd = {
391 .action = cpu_to_le32(IWL_RX_BAID_ACTION_REMOVE),
392 .remove.sta_id_mask =
393 cpu_to_le32(iwl_mld_fw_sta_id_mask(mld, sta)),
394 .remove.tid = cpu_to_le32(tid),
395
396 };
397 int ret;
398
399 ret = iwl_mld_send_cmd_pdu(mld,
400 WIDE_ID(DATA_PATH_GROUP,
401 RX_BAID_ALLOCATION_CONFIG_CMD),
402 &cmd);
403 if (ret)
404 return ret;
405
406 IWL_DEBUG_HT(mld, "RX BA Session stopped in fw\n");
407
408 return ret;
409 }
410
411 static int
iwl_mld_start_ba_in_fw(struct iwl_mld * mld,struct ieee80211_sta * sta,int tid,u16 ssn,u16 buf_size)412 iwl_mld_start_ba_in_fw(struct iwl_mld *mld, struct ieee80211_sta *sta,
413 int tid, u16 ssn, u16 buf_size)
414 {
415 struct iwl_rx_baid_cfg_cmd cmd = {
416 .action = cpu_to_le32(IWL_RX_BAID_ACTION_ADD),
417 .alloc.sta_id_mask =
418 cpu_to_le32(iwl_mld_fw_sta_id_mask(mld, sta)),
419 .alloc.tid = tid,
420 .alloc.ssn = cpu_to_le16(ssn),
421 .alloc.win_size = cpu_to_le16(buf_size),
422 };
423 struct iwl_host_cmd hcmd = {
424 .id = WIDE_ID(DATA_PATH_GROUP, RX_BAID_ALLOCATION_CONFIG_CMD),
425 .flags = CMD_WANT_SKB,
426 .len[0] = sizeof(cmd),
427 .data[0] = &cmd,
428 };
429 struct iwl_rx_baid_cfg_resp *resp;
430 struct iwl_rx_packet *pkt;
431 u32 resp_len;
432 int ret, baid;
433
434 BUILD_BUG_ON(sizeof(*resp) != sizeof(baid));
435
436 ret = iwl_mld_send_cmd(mld, &hcmd);
437 if (ret)
438 return ret;
439
440 pkt = hcmd.resp_pkt;
441
442 resp_len = iwl_rx_packet_payload_len(pkt);
443 if (IWL_FW_CHECK(mld, resp_len != sizeof(*resp),
444 "BAID_ALLOC_CMD: unexpected response length %d\n",
445 resp_len)) {
446 ret = -EIO;
447 goto out;
448 }
449
450 IWL_DEBUG_HT(mld, "RX BA Session started in fw\n");
451
452 resp = (void *)pkt->data;
453 baid = le32_to_cpu(resp->baid);
454
455 if (IWL_FW_CHECK(mld, baid < 0 || baid >= ARRAY_SIZE(mld->fw_id_to_ba),
456 "BAID_ALLOC_CMD: invalid BAID response %d\n", baid)) {
457 ret = -EINVAL;
458 goto out;
459 }
460
461 ret = baid;
462 out:
463 iwl_free_resp(&hcmd);
464 return ret;
465 }
466
iwl_mld_init_reorder_buffer(struct iwl_mld * mld,struct iwl_mld_baid_data * data,u16 ssn)467 static void iwl_mld_init_reorder_buffer(struct iwl_mld *mld,
468 struct iwl_mld_baid_data *data,
469 u16 ssn)
470 {
471 for (int i = 0; i < mld->trans->info.num_rxqs; i++) {
472 struct iwl_mld_reorder_buffer *reorder_buf =
473 &data->reorder_buf[i];
474 struct iwl_mld_reorder_buf_entry *entries =
475 &data->entries[i * data->entries_per_queue];
476
477 reorder_buf->head_sn = ssn;
478 reorder_buf->queue = i;
479
480 for (int j = 0; j < data->buf_size; j++)
481 __skb_queue_head_init(&entries[j].frames);
482 }
483 }
484
iwl_mld_free_reorder_buffer(struct iwl_mld * mld,struct iwl_mld_baid_data * data)485 static void iwl_mld_free_reorder_buffer(struct iwl_mld *mld,
486 struct iwl_mld_baid_data *data)
487 {
488 struct iwl_mld_delba_data delba_data = {
489 .baid = data->baid,
490 };
491
492 iwl_mld_sync_rx_queues(mld, IWL_MLD_RXQ_NOTIF_DEL_BA,
493 &delba_data, sizeof(delba_data));
494
495 for (int i = 0; i < mld->trans->info.num_rxqs; i++) {
496 struct iwl_mld_reorder_buffer *reorder_buf =
497 &data->reorder_buf[i];
498 struct iwl_mld_reorder_buf_entry *entries =
499 &data->entries[i * data->entries_per_queue];
500
501 if (likely(!reorder_buf->num_stored))
502 continue;
503
504 /* This shouldn't happen in regular DELBA since the RX queues
505 * sync internal DELBA notification should trigger a release
506 * of all frames in the reorder buffer.
507 */
508 WARN_ON(1);
509
510 for (int j = 0; j < data->buf_size; j++)
511 __skb_queue_purge(&entries[j].frames);
512 }
513 }
514
iwl_mld_ampdu_rx_start(struct iwl_mld * mld,struct ieee80211_sta * sta,int tid,u16 ssn,u16 buf_size,u16 timeout)515 int iwl_mld_ampdu_rx_start(struct iwl_mld *mld, struct ieee80211_sta *sta,
516 int tid, u16 ssn, u16 buf_size, u16 timeout)
517 {
518 struct iwl_mld_sta *mld_sta = iwl_mld_sta_from_mac80211(sta);
519 struct iwl_mld_baid_data *baid_data = NULL;
520 u32 reorder_buf_size = buf_size * sizeof(baid_data->entries[0]);
521 int ret, baid;
522 u32 sta_mask;
523
524 lockdep_assert_wiphy(mld->wiphy);
525
526 if (mld->num_rx_ba_sessions >= IWL_MAX_BAID) {
527 IWL_DEBUG_HT(mld,
528 "Max num of RX BA sessions reached; blocking new session\n");
529 return -ENOSPC;
530 }
531
532 sta_mask = iwl_mld_fw_sta_id_mask(mld, sta);
533 if (WARN_ON(!sta_mask))
534 return -EINVAL;
535
536 /* sparse doesn't like the __align() so don't check */
537 #ifndef __CHECKER__
538 /* The division below will be OK if either the cache line size
539 * can be divided by the entry size (ALIGN will round up) or if
540 * the entry size can be divided by the cache line size, in which
541 * case the ALIGN() will do nothing.
542 */
543 BUILD_BUG_ON(SMP_CACHE_BYTES % sizeof(baid_data->entries[0]) &&
544 sizeof(baid_data->entries[0]) % SMP_CACHE_BYTES);
545 #endif
546
547 /* Upward align the reorder buffer size to fill an entire cache
548 * line for each queue, to avoid sharing cache lines between
549 * different queues.
550 */
551 reorder_buf_size = ALIGN(reorder_buf_size, SMP_CACHE_BYTES);
552
553 /* Allocate here so if allocation fails we can bail out early
554 * before starting the BA session in the firmware
555 */
556 baid_data = kzalloc(sizeof(*baid_data) +
557 mld->trans->info.num_rxqs * reorder_buf_size,
558 GFP_KERNEL);
559 if (!baid_data)
560 return -ENOMEM;
561
562 /* This division is why we need the above BUILD_BUG_ON(),
563 * if that doesn't hold then this will not be right.
564 */
565 baid_data->entries_per_queue =
566 reorder_buf_size / sizeof(baid_data->entries[0]);
567
568 baid = iwl_mld_start_ba_in_fw(mld, sta, tid, ssn, buf_size);
569 if (baid < 0) {
570 ret = baid;
571 goto out_free;
572 }
573
574 mld->num_rx_ba_sessions++;
575 mld_sta->tid_to_baid[tid] = baid;
576
577 baid_data->baid = baid;
578 baid_data->mld = mld;
579 baid_data->tid = tid;
580 baid_data->buf_size = buf_size;
581 baid_data->sta_mask = sta_mask;
582 baid_data->timeout = timeout;
583 baid_data->last_rx_timestamp = jiffies;
584 baid_data->rcu_ptr = &mld->fw_id_to_ba[baid];
585
586 iwl_mld_init_reorder_buffer(mld, baid_data, ssn);
587
588 timer_setup(&baid_data->session_timer, iwl_mld_rx_agg_session_expired,
589 0);
590 if (timeout)
591 mod_timer(&baid_data->session_timer,
592 TU_TO_EXP_TIME(timeout * 2));
593
594 IWL_DEBUG_HT(mld, "STA mask=0x%x (tid=%d) is assigned to BAID %d\n",
595 baid_data->sta_mask, tid, baid);
596
597 /* protect the BA data with RCU to cover a case where our
598 * internal RX sync mechanism will timeout (not that it's
599 * supposed to happen) and we will free the session data while
600 * RX is being processed in parallel
601 */
602 WARN_ON(rcu_access_pointer(mld->fw_id_to_ba[baid]));
603 rcu_assign_pointer(mld->fw_id_to_ba[baid], baid_data);
604
605 return 0;
606
607 out_free:
608 kfree(baid_data);
609 return ret;
610 }
611
iwl_mld_ampdu_rx_stop(struct iwl_mld * mld,struct ieee80211_sta * sta,int tid)612 int iwl_mld_ampdu_rx_stop(struct iwl_mld *mld, struct ieee80211_sta *sta,
613 int tid)
614 {
615 struct iwl_mld_sta *mld_sta = iwl_mld_sta_from_mac80211(sta);
616 int baid = mld_sta->tid_to_baid[tid];
617 struct iwl_mld_baid_data *baid_data;
618 int ret;
619
620 lockdep_assert_wiphy(mld->wiphy);
621
622 /* during firmware restart, do not send the command as the firmware no
623 * longer recognizes the session. instead, only clear the driver BA
624 * session data.
625 */
626 if (!mld->fw_status.in_hw_restart) {
627 ret = iwl_mld_stop_ba_in_fw(mld, sta, tid);
628 if (ret)
629 return ret;
630 }
631
632 if (!WARN_ON(mld->num_rx_ba_sessions == 0))
633 mld->num_rx_ba_sessions--;
634
635 baid_data = wiphy_dereference(mld->wiphy, mld->fw_id_to_ba[baid]);
636 if (WARN_ON(!baid_data))
637 return -EINVAL;
638
639 if (timer_pending(&baid_data->session_timer))
640 timer_shutdown_sync(&baid_data->session_timer);
641
642 iwl_mld_free_reorder_buffer(mld, baid_data);
643
644 RCU_INIT_POINTER(mld->fw_id_to_ba[baid], NULL);
645 kfree_rcu(baid_data, rcu_head);
646
647 IWL_DEBUG_HT(mld, "BAID %d is free\n", baid);
648
649 return 0;
650 }
651
iwl_mld_update_sta_baids(struct iwl_mld * mld,u32 old_sta_mask,u32 new_sta_mask)652 int iwl_mld_update_sta_baids(struct iwl_mld *mld,
653 u32 old_sta_mask,
654 u32 new_sta_mask)
655 {
656 struct iwl_rx_baid_cfg_cmd cmd = {
657 .action = cpu_to_le32(IWL_RX_BAID_ACTION_MODIFY),
658 .modify.old_sta_id_mask = cpu_to_le32(old_sta_mask),
659 .modify.new_sta_id_mask = cpu_to_le32(new_sta_mask),
660 };
661 u32 cmd_id = WIDE_ID(DATA_PATH_GROUP, RX_BAID_ALLOCATION_CONFIG_CMD);
662 int baid;
663
664 /* mac80211 will remove sessions later, but we ignore all that */
665 if (mld->fw_status.in_hw_restart)
666 return 0;
667
668 BUILD_BUG_ON(sizeof(struct iwl_rx_baid_cfg_resp) != sizeof(baid));
669
670 for (baid = 0; baid < ARRAY_SIZE(mld->fw_id_to_ba); baid++) {
671 struct iwl_mld_baid_data *data;
672 int ret;
673
674 data = wiphy_dereference(mld->wiphy, mld->fw_id_to_ba[baid]);
675 if (!data)
676 continue;
677
678 if (!(data->sta_mask & old_sta_mask))
679 continue;
680
681 WARN_ONCE(data->sta_mask != old_sta_mask,
682 "BAID data for %d corrupted - expected 0x%x found 0x%x\n",
683 baid, old_sta_mask, data->sta_mask);
684
685 cmd.modify.tid = cpu_to_le32(data->tid);
686
687 ret = iwl_mld_send_cmd_pdu(mld, cmd_id, &cmd);
688 if (ret)
689 return ret;
690 data->sta_mask = new_sta_mask;
691 }
692
693 return 0;
694 }
695