1 // SPDX-License-Identifier: BSD-3-Clause-Clear
2 /*
3  * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
4  * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
5  */
6 
7 #include "core.h"
8 #include "peer.h"
9 #include "debug.h"
10 
11 static struct ath11k_peer *ath11k_peer_find_list_by_id(struct ath11k_base *ab,
12 						       int peer_id)
13 {
14 	struct ath11k_peer *peer;
15 
16 	lockdep_assert_held(&ab->base_lock);
17 
18 	list_for_each_entry(peer, &ab->peers, list) {
19 		if (peer->peer_id != peer_id)
20 			continue;
21 
22 		return peer;
23 	}
24 
25 	return NULL;
26 }
27 
28 struct ath11k_peer *ath11k_peer_find(struct ath11k_base *ab, int vdev_id,
29 				     const u8 *addr)
30 {
31 	struct ath11k_peer *peer;
32 
33 	lockdep_assert_held(&ab->base_lock);
34 
35 	list_for_each_entry(peer, &ab->peers, list) {
36 		if (peer->vdev_id != vdev_id)
37 			continue;
38 		if (!ether_addr_equal(peer->addr, addr))
39 			continue;
40 
41 		return peer;
42 	}
43 
44 	return NULL;
45 }
46 
47 struct ath11k_peer *ath11k_peer_find_by_addr(struct ath11k_base *ab,
48 					     const u8 *addr)
49 {
50 	struct ath11k_peer *peer;
51 
52 	lockdep_assert_held(&ab->base_lock);
53 
54 	if (!ab->rhead_peer_addr)
55 		return NULL;
56 
57 	peer = rhashtable_lookup_fast(ab->rhead_peer_addr, addr,
58 				      ab->rhash_peer_addr_param);
59 
60 	return peer;
61 }
62 
63 struct ath11k_peer *ath11k_peer_find_by_id(struct ath11k_base *ab,
64 					   int peer_id)
65 {
66 	struct ath11k_peer *peer;
67 
68 	lockdep_assert_held(&ab->base_lock);
69 
70 	if (!ab->rhead_peer_id)
71 		return NULL;
72 
73 	peer = rhashtable_lookup_fast(ab->rhead_peer_id, &peer_id,
74 				      ab->rhash_peer_id_param);
75 
76 	return peer;
77 }
78 
79 struct ath11k_peer *ath11k_peer_find_by_vdev_id(struct ath11k_base *ab,
80 						int vdev_id)
81 {
82 	struct ath11k_peer *peer;
83 
84 	spin_lock_bh(&ab->base_lock);
85 
86 	list_for_each_entry(peer, &ab->peers, list) {
87 		if (vdev_id == peer->vdev_id) {
88 			spin_unlock_bh(&ab->base_lock);
89 			return peer;
90 		}
91 	}
92 	spin_unlock_bh(&ab->base_lock);
93 	return NULL;
94 }
95 
96 void ath11k_peer_unmap_event(struct ath11k_base *ab, u16 peer_id)
97 {
98 	struct ath11k_peer *peer;
99 
100 	spin_lock_bh(&ab->base_lock);
101 
102 	peer = ath11k_peer_find_list_by_id(ab, peer_id);
103 	if (!peer) {
104 		ath11k_warn(ab, "peer-unmap-event: unknown peer id %d\n",
105 			    peer_id);
106 		goto exit;
107 	}
108 
109 	ath11k_dbg(ab, ATH11K_DBG_DP_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
110 		   peer->vdev_id, peer->addr, peer_id);
111 
112 	list_del(&peer->list);
113 	kfree(peer);
114 	wake_up(&ab->peer_mapping_wq);
115 
116 exit:
117 	spin_unlock_bh(&ab->base_lock);
118 }
119 
120 void ath11k_peer_map_event(struct ath11k_base *ab, u8 vdev_id, u16 peer_id,
121 			   u8 *mac_addr, u16 ast_hash, u16 hw_peer_id)
122 {
123 	struct ath11k_peer *peer;
124 
125 	spin_lock_bh(&ab->base_lock);
126 	peer = ath11k_peer_find(ab, vdev_id, mac_addr);
127 	if (!peer) {
128 		peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
129 		if (!peer)
130 			goto exit;
131 
132 		peer->vdev_id = vdev_id;
133 		peer->peer_id = peer_id;
134 		peer->ast_hash = ast_hash;
135 		peer->hw_peer_id = hw_peer_id;
136 		ether_addr_copy(peer->addr, mac_addr);
137 		list_add(&peer->list, &ab->peers);
138 		wake_up(&ab->peer_mapping_wq);
139 	}
140 
141 	ath11k_dbg(ab, ATH11K_DBG_DP_HTT, "htt peer map vdev %d peer %pM id %d\n",
142 		   vdev_id, mac_addr, peer_id);
143 
144 exit:
145 	spin_unlock_bh(&ab->base_lock);
146 }
147 
148 static int ath11k_wait_for_peer_common(struct ath11k_base *ab, int vdev_id,
149 				       const u8 *addr, bool expect_mapped)
150 {
151 	int ret;
152 
153 	ret = wait_event_timeout(ab->peer_mapping_wq, ({
154 				bool mapped;
155 
156 				spin_lock_bh(&ab->base_lock);
157 				mapped = !!ath11k_peer_find(ab, vdev_id, addr);
158 				spin_unlock_bh(&ab->base_lock);
159 
160 				(mapped == expect_mapped ||
161 				 test_bit(ATH11K_FLAG_CRASH_FLUSH, &ab->dev_flags));
162 				}), 3 * HZ);
163 
164 	if (ret <= 0)
165 		return -ETIMEDOUT;
166 
167 	return 0;
168 }
169 
170 static inline int ath11k_peer_rhash_insert(struct ath11k_base *ab,
171 					   struct rhashtable *rtbl,
172 					   struct rhash_head *rhead,
173 					   struct rhashtable_params *params,
174 					   void *key)
175 {
176 	struct ath11k_peer *tmp;
177 
178 	lockdep_assert_held(&ab->tbl_mtx_lock);
179 
180 	tmp = rhashtable_lookup_get_insert_fast(rtbl, rhead, *params);
181 
182 	if (!tmp)
183 		return 0;
184 	else if (IS_ERR(tmp))
185 		return PTR_ERR(tmp);
186 	else
187 		return -EEXIST;
188 }
189 
190 static inline int ath11k_peer_rhash_remove(struct ath11k_base *ab,
191 					   struct rhashtable *rtbl,
192 					   struct rhash_head *rhead,
193 					   struct rhashtable_params *params)
194 {
195 	int ret;
196 
197 	lockdep_assert_held(&ab->tbl_mtx_lock);
198 
199 	ret = rhashtable_remove_fast(rtbl, rhead, *params);
200 	if (ret && ret != -ENOENT)
201 		return ret;
202 
203 	return 0;
204 }
205 
206 static int ath11k_peer_rhash_add(struct ath11k_base *ab, struct ath11k_peer *peer)
207 {
208 	int ret;
209 
210 	lockdep_assert_held(&ab->base_lock);
211 	lockdep_assert_held(&ab->tbl_mtx_lock);
212 
213 	if (!ab->rhead_peer_id || !ab->rhead_peer_addr)
214 		return -EPERM;
215 
216 	ret = ath11k_peer_rhash_insert(ab, ab->rhead_peer_id, &peer->rhash_id,
217 				       &ab->rhash_peer_id_param, &peer->peer_id);
218 	if (ret) {
219 		ath11k_warn(ab, "failed to add peer %pM with id %d in rhash_id ret %d\n",
220 			    peer->addr, peer->peer_id, ret);
221 		return ret;
222 	}
223 
224 	ret = ath11k_peer_rhash_insert(ab, ab->rhead_peer_addr, &peer->rhash_addr,
225 				       &ab->rhash_peer_addr_param, &peer->addr);
226 	if (ret) {
227 		ath11k_warn(ab, "failed to add peer %pM with id %d in rhash_addr ret %d\n",
228 			    peer->addr, peer->peer_id, ret);
229 		goto err_clean;
230 	}
231 
232 	return 0;
233 
234 err_clean:
235 	ath11k_peer_rhash_remove(ab, ab->rhead_peer_id, &peer->rhash_id,
236 				 &ab->rhash_peer_id_param);
237 	return ret;
238 }
239 
240 void ath11k_peer_cleanup(struct ath11k *ar, u32 vdev_id)
241 {
242 	struct ath11k_peer *peer, *tmp;
243 	struct ath11k_base *ab = ar->ab;
244 
245 	lockdep_assert_held(&ar->conf_mutex);
246 
247 	mutex_lock(&ab->tbl_mtx_lock);
248 	spin_lock_bh(&ab->base_lock);
249 	list_for_each_entry_safe(peer, tmp, &ab->peers, list) {
250 		if (peer->vdev_id != vdev_id)
251 			continue;
252 
253 		ath11k_warn(ab, "removing stale peer %pM from vdev_id %d\n",
254 			    peer->addr, vdev_id);
255 
256 		ath11k_peer_rhash_delete(ab, peer);
257 		list_del(&peer->list);
258 		kfree(peer);
259 		ar->num_peers--;
260 	}
261 
262 	spin_unlock_bh(&ab->base_lock);
263 	mutex_unlock(&ab->tbl_mtx_lock);
264 }
265 
266 static int ath11k_wait_for_peer_deleted(struct ath11k *ar, int vdev_id, const u8 *addr)
267 {
268 	return ath11k_wait_for_peer_common(ar->ab, vdev_id, addr, false);
269 }
270 
271 int ath11k_wait_for_peer_delete_done(struct ath11k *ar, u32 vdev_id,
272 				     const u8 *addr)
273 {
274 	int ret;
275 	unsigned long time_left;
276 
277 	ret = ath11k_wait_for_peer_deleted(ar, vdev_id, addr);
278 	if (ret) {
279 		ath11k_warn(ar->ab, "failed wait for peer deleted");
280 		return ret;
281 	}
282 
283 	time_left = wait_for_completion_timeout(&ar->peer_delete_done,
284 						3 * HZ);
285 	if (time_left == 0) {
286 		ath11k_warn(ar->ab, "Timeout in receiving peer delete response\n");
287 		return -ETIMEDOUT;
288 	}
289 
290 	return 0;
291 }
292 
293 static int __ath11k_peer_delete(struct ath11k *ar, u32 vdev_id, const u8 *addr)
294 {
295 	int ret;
296 	struct ath11k_peer *peer;
297 	struct ath11k_base *ab = ar->ab;
298 
299 	lockdep_assert_held(&ar->conf_mutex);
300 
301 	mutex_lock(&ab->tbl_mtx_lock);
302 	spin_lock_bh(&ab->base_lock);
303 
304 	peer = ath11k_peer_find_by_addr(ab, addr);
305 	if (!peer) {
306 		spin_unlock_bh(&ab->base_lock);
307 		mutex_unlock(&ab->tbl_mtx_lock);
308 
309 		ath11k_warn(ab,
310 			    "failed to find peer vdev_id %d addr %pM in delete\n",
311 			    vdev_id, addr);
312 		return -EINVAL;
313 	}
314 
315 	ath11k_peer_rhash_delete(ab, peer);
316 
317 	spin_unlock_bh(&ab->base_lock);
318 	mutex_unlock(&ab->tbl_mtx_lock);
319 
320 	reinit_completion(&ar->peer_delete_done);
321 
322 	ret = ath11k_wmi_send_peer_delete_cmd(ar, addr, vdev_id);
323 	if (ret) {
324 		ath11k_warn(ab,
325 			    "failed to delete peer vdev_id %d addr %pM ret %d\n",
326 			    vdev_id, addr, ret);
327 		return ret;
328 	}
329 
330 	ret = ath11k_wait_for_peer_delete_done(ar, vdev_id, addr);
331 	if (ret)
332 		return ret;
333 
334 	return 0;
335 }
336 
337 int ath11k_peer_delete(struct ath11k *ar, u32 vdev_id, u8 *addr)
338 {
339 	int ret;
340 
341 	lockdep_assert_held(&ar->conf_mutex);
342 
343 	ret = __ath11k_peer_delete(ar, vdev_id, addr);
344 	if (ret)
345 		return ret;
346 
347 	ar->num_peers--;
348 
349 	return 0;
350 }
351 
352 static int ath11k_wait_for_peer_created(struct ath11k *ar, int vdev_id, const u8 *addr)
353 {
354 	return ath11k_wait_for_peer_common(ar->ab, vdev_id, addr, true);
355 }
356 
357 int ath11k_peer_create(struct ath11k *ar, struct ath11k_vif *arvif,
358 		       struct ieee80211_sta *sta, struct peer_create_params *param)
359 {
360 	struct ath11k_peer *peer;
361 	struct ath11k_sta *arsta;
362 	int ret, fbret;
363 
364 	lockdep_assert_held(&ar->conf_mutex);
365 
366 	if (ar->num_peers > (ar->max_num_peers - 1)) {
367 		ath11k_warn(ar->ab,
368 			    "failed to create peer due to insufficient peer entry resource in firmware\n");
369 		return -ENOBUFS;
370 	}
371 
372 	spin_lock_bh(&ar->ab->base_lock);
373 	peer = ath11k_peer_find_by_addr(ar->ab, param->peer_addr);
374 	if (peer) {
375 		spin_unlock_bh(&ar->ab->base_lock);
376 		return -EINVAL;
377 	}
378 	spin_unlock_bh(&ar->ab->base_lock);
379 
380 	ret = ath11k_wmi_send_peer_create_cmd(ar, param);
381 	if (ret) {
382 		ath11k_warn(ar->ab,
383 			    "failed to send peer create vdev_id %d ret %d\n",
384 			    param->vdev_id, ret);
385 		return ret;
386 	}
387 
388 	ret = ath11k_wait_for_peer_created(ar, param->vdev_id,
389 					   param->peer_addr);
390 	if (ret)
391 		return ret;
392 
393 	mutex_lock(&ar->ab->tbl_mtx_lock);
394 	spin_lock_bh(&ar->ab->base_lock);
395 
396 	peer = ath11k_peer_find(ar->ab, param->vdev_id, param->peer_addr);
397 	if (!peer) {
398 		spin_unlock_bh(&ar->ab->base_lock);
399 		mutex_unlock(&ar->ab->tbl_mtx_lock);
400 		ath11k_warn(ar->ab, "failed to find peer %pM on vdev %i after creation\n",
401 			    param->peer_addr, param->vdev_id);
402 
403 		ret = -ENOENT;
404 		goto cleanup;
405 	}
406 
407 	ret = ath11k_peer_rhash_add(ar->ab, peer);
408 	if (ret) {
409 		spin_unlock_bh(&ar->ab->base_lock);
410 		mutex_unlock(&ar->ab->tbl_mtx_lock);
411 		goto cleanup;
412 	}
413 
414 	peer->pdev_idx = ar->pdev_idx;
415 	peer->sta = sta;
416 
417 	if (arvif->vif->type == NL80211_IFTYPE_STATION) {
418 		arvif->ast_hash = peer->ast_hash;
419 		arvif->ast_idx = peer->hw_peer_id;
420 	}
421 
422 	peer->sec_type = HAL_ENCRYPT_TYPE_OPEN;
423 	peer->sec_type_grp = HAL_ENCRYPT_TYPE_OPEN;
424 
425 	if (sta) {
426 		arsta = (struct ath11k_sta *)sta->drv_priv;
427 		arsta->tcl_metadata |= FIELD_PREP(HTT_TCL_META_DATA_TYPE, 0) |
428 				       FIELD_PREP(HTT_TCL_META_DATA_PEER_ID,
429 						  peer->peer_id);
430 
431 		/* set HTT extension valid bit to 0 by default */
432 		arsta->tcl_metadata &= ~HTT_TCL_META_DATA_VALID_HTT;
433 	}
434 
435 	ar->num_peers++;
436 
437 	spin_unlock_bh(&ar->ab->base_lock);
438 	mutex_unlock(&ar->ab->tbl_mtx_lock);
439 
440 	return 0;
441 
442 cleanup:
443 	fbret = __ath11k_peer_delete(ar, param->vdev_id, param->peer_addr);
444 	if (fbret)
445 		ath11k_warn(ar->ab, "failed peer %pM delete vdev_id %d fallback ret %d\n",
446 			    param->peer_addr, param->vdev_id, fbret);
447 
448 	return ret;
449 }
450 
451 int ath11k_peer_rhash_delete(struct ath11k_base *ab, struct ath11k_peer *peer)
452 {
453 	int ret;
454 
455 	lockdep_assert_held(&ab->base_lock);
456 	lockdep_assert_held(&ab->tbl_mtx_lock);
457 
458 	if (!ab->rhead_peer_id || !ab->rhead_peer_addr)
459 		return -EPERM;
460 
461 	ret = ath11k_peer_rhash_remove(ab, ab->rhead_peer_addr, &peer->rhash_addr,
462 				       &ab->rhash_peer_addr_param);
463 	if (ret) {
464 		ath11k_warn(ab, "failed to remove peer %pM id %d in rhash_addr ret %d\n",
465 			    peer->addr, peer->peer_id, ret);
466 		return ret;
467 	}
468 
469 	ret = ath11k_peer_rhash_remove(ab, ab->rhead_peer_id, &peer->rhash_id,
470 				       &ab->rhash_peer_id_param);
471 	if (ret) {
472 		ath11k_warn(ab, "failed to remove peer %pM id %d in rhash_id ret %d\n",
473 			    peer->addr, peer->peer_id, ret);
474 		return ret;
475 	}
476 
477 	return 0;
478 }
479 
480 static int ath11k_peer_rhash_id_tbl_init(struct ath11k_base *ab)
481 {
482 	struct rhashtable_params *param;
483 	struct rhashtable *rhash_id_tbl;
484 	int ret;
485 	size_t size;
486 
487 	lockdep_assert_held(&ab->tbl_mtx_lock);
488 
489 	if (ab->rhead_peer_id)
490 		return 0;
491 
492 	size = sizeof(*ab->rhead_peer_id);
493 	rhash_id_tbl = kzalloc(size, GFP_KERNEL);
494 	if (!rhash_id_tbl) {
495 		ath11k_warn(ab, "failed to init rhash id table due to no mem (size %zu)\n",
496 			    size);
497 		return -ENOMEM;
498 	}
499 
500 	param = &ab->rhash_peer_id_param;
501 
502 	param->key_offset = offsetof(struct ath11k_peer, peer_id);
503 	param->head_offset = offsetof(struct ath11k_peer, rhash_id);
504 	param->key_len = sizeof_field(struct ath11k_peer, peer_id);
505 	param->automatic_shrinking = true;
506 	param->nelem_hint = ab->num_radios * TARGET_NUM_PEERS_PDEV(ab);
507 
508 	ret = rhashtable_init(rhash_id_tbl, param);
509 	if (ret) {
510 		ath11k_warn(ab, "failed to init peer id rhash table %d\n", ret);
511 		goto err_free;
512 	}
513 
514 	spin_lock_bh(&ab->base_lock);
515 
516 	if (!ab->rhead_peer_id) {
517 		ab->rhead_peer_id = rhash_id_tbl;
518 	} else {
519 		spin_unlock_bh(&ab->base_lock);
520 		goto cleanup_tbl;
521 	}
522 
523 	spin_unlock_bh(&ab->base_lock);
524 
525 	return 0;
526 
527 cleanup_tbl:
528 	rhashtable_destroy(rhash_id_tbl);
529 err_free:
530 	kfree(rhash_id_tbl);
531 
532 	return ret;
533 }
534 
535 static int ath11k_peer_rhash_addr_tbl_init(struct ath11k_base *ab)
536 {
537 	struct rhashtable_params *param;
538 	struct rhashtable *rhash_addr_tbl;
539 	int ret;
540 	size_t size;
541 
542 	lockdep_assert_held(&ab->tbl_mtx_lock);
543 
544 	if (ab->rhead_peer_addr)
545 		return 0;
546 
547 	size = sizeof(*ab->rhead_peer_addr);
548 	rhash_addr_tbl = kzalloc(size, GFP_KERNEL);
549 	if (!rhash_addr_tbl) {
550 		ath11k_warn(ab, "failed to init rhash addr table due to no mem (size %zu)\n",
551 			    size);
552 		return -ENOMEM;
553 	}
554 
555 	param = &ab->rhash_peer_addr_param;
556 
557 	param->key_offset = offsetof(struct ath11k_peer, addr);
558 	param->head_offset = offsetof(struct ath11k_peer, rhash_addr);
559 	param->key_len = sizeof_field(struct ath11k_peer, addr);
560 	param->automatic_shrinking = true;
561 	param->nelem_hint = ab->num_radios * TARGET_NUM_PEERS_PDEV(ab);
562 
563 	ret = rhashtable_init(rhash_addr_tbl, param);
564 	if (ret) {
565 		ath11k_warn(ab, "failed to init peer addr rhash table %d\n", ret);
566 		goto err_free;
567 	}
568 
569 	spin_lock_bh(&ab->base_lock);
570 
571 	if (!ab->rhead_peer_addr) {
572 		ab->rhead_peer_addr = rhash_addr_tbl;
573 	} else {
574 		spin_unlock_bh(&ab->base_lock);
575 		goto cleanup_tbl;
576 	}
577 
578 	spin_unlock_bh(&ab->base_lock);
579 
580 	return 0;
581 
582 cleanup_tbl:
583 	rhashtable_destroy(rhash_addr_tbl);
584 err_free:
585 	kfree(rhash_addr_tbl);
586 
587 	return ret;
588 }
589 
590 static inline void ath11k_peer_rhash_id_tbl_destroy(struct ath11k_base *ab)
591 {
592 	lockdep_assert_held(&ab->tbl_mtx_lock);
593 
594 	if (!ab->rhead_peer_id)
595 		return;
596 
597 	rhashtable_destroy(ab->rhead_peer_id);
598 	kfree(ab->rhead_peer_id);
599 	ab->rhead_peer_id = NULL;
600 }
601 
602 static inline void ath11k_peer_rhash_addr_tbl_destroy(struct ath11k_base *ab)
603 {
604 	lockdep_assert_held(&ab->tbl_mtx_lock);
605 
606 	if (!ab->rhead_peer_addr)
607 		return;
608 
609 	rhashtable_destroy(ab->rhead_peer_addr);
610 	kfree(ab->rhead_peer_addr);
611 	ab->rhead_peer_addr = NULL;
612 }
613 
614 int ath11k_peer_rhash_tbl_init(struct ath11k_base *ab)
615 {
616 	int ret;
617 
618 	mutex_lock(&ab->tbl_mtx_lock);
619 
620 	ret = ath11k_peer_rhash_id_tbl_init(ab);
621 	if (ret)
622 		goto out;
623 
624 	ret = ath11k_peer_rhash_addr_tbl_init(ab);
625 	if (ret)
626 		goto cleanup_tbl;
627 
628 	mutex_unlock(&ab->tbl_mtx_lock);
629 
630 	return 0;
631 
632 cleanup_tbl:
633 	ath11k_peer_rhash_id_tbl_destroy(ab);
634 out:
635 	mutex_unlock(&ab->tbl_mtx_lock);
636 	return ret;
637 }
638 
639 void ath11k_peer_rhash_tbl_destroy(struct ath11k_base *ab)
640 {
641 	mutex_lock(&ab->tbl_mtx_lock);
642 
643 	ath11k_peer_rhash_addr_tbl_destroy(ab);
644 	ath11k_peer_rhash_id_tbl_destroy(ab);
645 
646 	mutex_unlock(&ab->tbl_mtx_lock);
647 }
648