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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless
[deliverable/linux.git] / drivers / net / wireless / ath / ath6kl / txrx.c
1 /*
2 * Copyright (c) 2004-2011 Atheros Communications Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include "core.h"
18 #include "debug.h"
19
20 static u8 ath6kl_ibss_map_epid(struct sk_buff *skb, struct net_device *dev,
21 u32 *map_no)
22 {
23 struct ath6kl *ar = ath6kl_priv(dev);
24 struct ethhdr *eth_hdr;
25 u32 i, ep_map = -1;
26 u8 *datap;
27
28 *map_no = 0;
29 datap = skb->data;
30 eth_hdr = (struct ethhdr *) (datap + sizeof(struct wmi_data_hdr));
31
32 if (is_multicast_ether_addr(eth_hdr->h_dest))
33 return ENDPOINT_2;
34
35 for (i = 0; i < ar->node_num; i++) {
36 if (memcmp(eth_hdr->h_dest, ar->node_map[i].mac_addr,
37 ETH_ALEN) == 0) {
38 *map_no = i + 1;
39 ar->node_map[i].tx_pend++;
40 return ar->node_map[i].ep_id;
41 }
42
43 if ((ep_map == -1) && !ar->node_map[i].tx_pend)
44 ep_map = i;
45 }
46
47 if (ep_map == -1) {
48 ep_map = ar->node_num;
49 ar->node_num++;
50 if (ar->node_num > MAX_NODE_NUM)
51 return ENDPOINT_UNUSED;
52 }
53
54 memcpy(ar->node_map[ep_map].mac_addr, eth_hdr->h_dest, ETH_ALEN);
55
56 for (i = ENDPOINT_2; i <= ENDPOINT_5; i++) {
57 if (!ar->tx_pending[i]) {
58 ar->node_map[ep_map].ep_id = i;
59 break;
60 }
61
62 /*
63 * No free endpoint is available, start redistribution on
64 * the inuse endpoints.
65 */
66 if (i == ENDPOINT_5) {
67 ar->node_map[ep_map].ep_id = ar->next_ep_id;
68 ar->next_ep_id++;
69 if (ar->next_ep_id > ENDPOINT_5)
70 ar->next_ep_id = ENDPOINT_2;
71 }
72 }
73
74 *map_no = ep_map + 1;
75 ar->node_map[ep_map].tx_pend++;
76
77 return ar->node_map[ep_map].ep_id;
78 }
79
80 static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb,
81 bool *more_data)
82 {
83 struct ethhdr *datap = (struct ethhdr *) skb->data;
84 struct ath6kl_sta *conn = NULL;
85 bool ps_queued = false, is_psq_empty = false;
86 struct ath6kl *ar = vif->ar;
87
88 if (is_multicast_ether_addr(datap->h_dest)) {
89 u8 ctr = 0;
90 bool q_mcast = false;
91
92 for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
93 if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) {
94 q_mcast = true;
95 break;
96 }
97 }
98
99 if (q_mcast) {
100 /*
101 * If this transmit is not because of a Dtim Expiry
102 * q it.
103 */
104 if (!test_bit(DTIM_EXPIRED, &vif->flags)) {
105 bool is_mcastq_empty = false;
106
107 spin_lock_bh(&ar->mcastpsq_lock);
108 is_mcastq_empty =
109 skb_queue_empty(&ar->mcastpsq);
110 skb_queue_tail(&ar->mcastpsq, skb);
111 spin_unlock_bh(&ar->mcastpsq_lock);
112
113 /*
114 * If this is the first Mcast pkt getting
115 * queued indicate to the target to set the
116 * BitmapControl LSB of the TIM IE.
117 */
118 if (is_mcastq_empty)
119 ath6kl_wmi_set_pvb_cmd(ar->wmi,
120 vif->fw_vif_idx,
121 MCAST_AID, 1);
122
123 ps_queued = true;
124 } else {
125 /*
126 * This transmit is because of Dtim expiry.
127 * Determine if MoreData bit has to be set.
128 */
129 spin_lock_bh(&ar->mcastpsq_lock);
130 if (!skb_queue_empty(&ar->mcastpsq))
131 *more_data = true;
132 spin_unlock_bh(&ar->mcastpsq_lock);
133 }
134 }
135 } else {
136 conn = ath6kl_find_sta(vif, datap->h_dest);
137 if (!conn) {
138 dev_kfree_skb(skb);
139
140 /* Inform the caller that the skb is consumed */
141 return true;
142 }
143
144 if (conn->sta_flags & STA_PS_SLEEP) {
145 if (!(conn->sta_flags & STA_PS_POLLED)) {
146 /* Queue the frames if the STA is sleeping */
147 spin_lock_bh(&conn->psq_lock);
148 is_psq_empty = skb_queue_empty(&conn->psq);
149 skb_queue_tail(&conn->psq, skb);
150 spin_unlock_bh(&conn->psq_lock);
151
152 /*
153 * If this is the first pkt getting queued
154 * for this STA, update the PVB for this
155 * STA.
156 */
157 if (is_psq_empty)
158 ath6kl_wmi_set_pvb_cmd(ar->wmi,
159 vif->fw_vif_idx,
160 conn->aid, 1);
161
162 ps_queued = true;
163 } else {
164 /*
165 * This tx is because of a PsPoll.
166 * Determine if MoreData bit has to be set.
167 */
168 spin_lock_bh(&conn->psq_lock);
169 if (!skb_queue_empty(&conn->psq))
170 *more_data = true;
171 spin_unlock_bh(&conn->psq_lock);
172 }
173 }
174 }
175
176 return ps_queued;
177 }
178
179 /* Tx functions */
180
181 int ath6kl_control_tx(void *devt, struct sk_buff *skb,
182 enum htc_endpoint_id eid)
183 {
184 struct ath6kl *ar = devt;
185 int status = 0;
186 struct ath6kl_cookie *cookie = NULL;
187
188 spin_lock_bh(&ar->lock);
189
190 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
191 "%s: skb=0x%p, len=0x%x eid =%d\n", __func__,
192 skb, skb->len, eid);
193
194 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) {
195 /*
196 * Control endpoint is full, don't allocate resources, we
197 * are just going to drop this packet.
198 */
199 cookie = NULL;
200 ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n",
201 skb, skb->len);
202 } else
203 cookie = ath6kl_alloc_cookie(ar);
204
205 if (cookie == NULL) {
206 spin_unlock_bh(&ar->lock);
207 status = -ENOMEM;
208 goto fail_ctrl_tx;
209 }
210
211 ar->tx_pending[eid]++;
212
213 if (eid != ar->ctrl_ep)
214 ar->total_tx_data_pend++;
215
216 spin_unlock_bh(&ar->lock);
217
218 cookie->skb = skb;
219 cookie->map_no = 0;
220 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
221 eid, ATH6KL_CONTROL_PKT_TAG);
222
223 /*
224 * This interface is asynchronous, if there is an error, cleanup
225 * will happen in the TX completion callback.
226 */
227 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
228
229 return 0;
230
231 fail_ctrl_tx:
232 dev_kfree_skb(skb);
233 return status;
234 }
235
236 int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
237 {
238 struct ath6kl *ar = ath6kl_priv(dev);
239 struct ath6kl_cookie *cookie = NULL;
240 enum htc_endpoint_id eid = ENDPOINT_UNUSED;
241 struct ath6kl_vif *vif = netdev_priv(dev);
242 u32 map_no = 0;
243 u16 htc_tag = ATH6KL_DATA_PKT_TAG;
244 u8 ac = 99 ; /* initialize to unmapped ac */
245 bool chk_adhoc_ps_mapping = false, more_data = false;
246 int ret;
247
248 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
249 "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
250 skb, skb->data, skb->len);
251
252 /* If target is not associated */
253 if (!test_bit(CONNECTED, &vif->flags)) {
254 dev_kfree_skb(skb);
255 return 0;
256 }
257
258 if (!test_bit(WMI_READY, &ar->flag))
259 goto fail_tx;
260
261 /* AP mode Power saving processing */
262 if (vif->nw_type == AP_NETWORK) {
263 if (ath6kl_powersave_ap(vif, skb, &more_data))
264 return 0;
265 }
266
267 if (test_bit(WMI_ENABLED, &ar->flag)) {
268 if (skb_headroom(skb) < dev->needed_headroom) {
269 struct sk_buff *tmp_skb = skb;
270
271 skb = skb_realloc_headroom(skb, dev->needed_headroom);
272 kfree_skb(tmp_skb);
273 if (skb == NULL) {
274 vif->net_stats.tx_dropped++;
275 return 0;
276 }
277 }
278
279 if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) {
280 ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n");
281 goto fail_tx;
282 }
283
284 if (ath6kl_wmi_data_hdr_add(ar->wmi, skb, DATA_MSGTYPE,
285 more_data, 0, 0, NULL,
286 vif->fw_vif_idx)) {
287 ath6kl_err("wmi_data_hdr_add failed\n");
288 goto fail_tx;
289 }
290
291 if ((vif->nw_type == ADHOC_NETWORK) &&
292 ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags))
293 chk_adhoc_ps_mapping = true;
294 else {
295 /* get the stream mapping */
296 ret = ath6kl_wmi_implicit_create_pstream(ar->wmi,
297 vif->fw_vif_idx, skb,
298 0, test_bit(WMM_ENABLED, &vif->flags), &ac);
299 if (ret)
300 goto fail_tx;
301 }
302 } else
303 goto fail_tx;
304
305 spin_lock_bh(&ar->lock);
306
307 if (chk_adhoc_ps_mapping)
308 eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
309 else
310 eid = ar->ac2ep_map[ac];
311
312 if (eid == 0 || eid == ENDPOINT_UNUSED) {
313 ath6kl_err("eid %d is not mapped!\n", eid);
314 spin_unlock_bh(&ar->lock);
315 goto fail_tx;
316 }
317
318 /* allocate resource for this packet */
319 cookie = ath6kl_alloc_cookie(ar);
320
321 if (!cookie) {
322 spin_unlock_bh(&ar->lock);
323 goto fail_tx;
324 }
325
326 /* update counts while the lock is held */
327 ar->tx_pending[eid]++;
328 ar->total_tx_data_pend++;
329
330 spin_unlock_bh(&ar->lock);
331
332 if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
333 skb_cloned(skb)) {
334 /*
335 * We will touch (move the buffer data to align it. Since the
336 * skb buffer is cloned and not only the header is changed, we
337 * have to copy it to allow the changes. Since we are copying
338 * the data here, we may as well align it by reserving suitable
339 * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
340 */
341 struct sk_buff *nskb;
342
343 nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
344 if (nskb == NULL)
345 goto fail_tx;
346 kfree_skb(skb);
347 skb = nskb;
348 }
349
350 cookie->skb = skb;
351 cookie->map_no = map_no;
352 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
353 eid, htc_tag);
354
355 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
356 skb->data, skb->len);
357
358 /*
359 * HTC interface is asynchronous, if this fails, cleanup will
360 * happen in the ath6kl_tx_complete callback.
361 */
362 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
363
364 return 0;
365
366 fail_tx:
367 dev_kfree_skb(skb);
368
369 vif->net_stats.tx_dropped++;
370 vif->net_stats.tx_aborted_errors++;
371
372 return 0;
373 }
374
375 /* indicate tx activity or inactivity on a WMI stream */
376 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
377 {
378 struct ath6kl *ar = devt;
379 enum htc_endpoint_id eid;
380 int i;
381
382 eid = ar->ac2ep_map[traffic_class];
383
384 if (!test_bit(WMI_ENABLED, &ar->flag))
385 goto notify_htc;
386
387 spin_lock_bh(&ar->lock);
388
389 ar->ac_stream_active[traffic_class] = active;
390
391 if (active) {
392 /*
393 * Keep track of the active stream with the highest
394 * priority.
395 */
396 if (ar->ac_stream_pri_map[traffic_class] >
397 ar->hiac_stream_active_pri)
398 /* set the new highest active priority */
399 ar->hiac_stream_active_pri =
400 ar->ac_stream_pri_map[traffic_class];
401
402 } else {
403 /*
404 * We may have to search for the next active stream
405 * that is the highest priority.
406 */
407 if (ar->hiac_stream_active_pri ==
408 ar->ac_stream_pri_map[traffic_class]) {
409 /*
410 * The highest priority stream just went inactive
411 * reset and search for the "next" highest "active"
412 * priority stream.
413 */
414 ar->hiac_stream_active_pri = 0;
415
416 for (i = 0; i < WMM_NUM_AC; i++) {
417 if (ar->ac_stream_active[i] &&
418 (ar->ac_stream_pri_map[i] >
419 ar->hiac_stream_active_pri))
420 /*
421 * Set the new highest active
422 * priority.
423 */
424 ar->hiac_stream_active_pri =
425 ar->ac_stream_pri_map[i];
426 }
427 }
428 }
429
430 spin_unlock_bh(&ar->lock);
431
432 notify_htc:
433 /* notify HTC, this may cause credit distribution changes */
434 ath6kl_htc_indicate_activity_change(ar->htc_target, eid, active);
435 }
436
437 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
438 struct htc_packet *packet)
439 {
440 struct ath6kl *ar = target->dev->ar;
441 struct ath6kl_vif *vif;
442 enum htc_endpoint_id endpoint = packet->endpoint;
443 enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
444
445 if (endpoint == ar->ctrl_ep) {
446 /*
447 * Under normal WMI if this is getting full, then something
448 * is running rampant the host should not be exhausting the
449 * WMI queue with too many commands the only exception to
450 * this is during testing using endpointping.
451 */
452 spin_lock_bh(&ar->lock);
453 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
454 spin_unlock_bh(&ar->lock);
455 ath6kl_err("wmi ctrl ep is full\n");
456 goto stop_adhoc_netq;
457 }
458
459 if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
460 goto stop_adhoc_netq;
461
462 /*
463 * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
464 * the highest active stream.
465 */
466 if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
467 ar->hiac_stream_active_pri &&
468 ar->cookie_count <= MAX_HI_COOKIE_NUM) {
469 /*
470 * Give preference to the highest priority stream by
471 * dropping the packets which overflowed.
472 */
473 action = HTC_SEND_FULL_DROP;
474 goto stop_adhoc_netq;
475 }
476
477 stop_adhoc_netq:
478 /* FIXME: Locking */
479 spin_lock_bh(&ar->list_lock);
480 list_for_each_entry(vif, &ar->vif_list, list) {
481 if (vif->nw_type == ADHOC_NETWORK) {
482 spin_unlock_bh(&ar->list_lock);
483
484 spin_lock_bh(&vif->if_lock);
485 set_bit(NETQ_STOPPED, &vif->flags);
486 spin_unlock_bh(&vif->if_lock);
487 netif_stop_queue(vif->ndev);
488
489 return action;
490 }
491 }
492 spin_unlock_bh(&ar->list_lock);
493
494 return action;
495 }
496
497 /* TODO this needs to be looked at */
498 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
499 enum htc_endpoint_id eid, u32 map_no)
500 {
501 struct ath6kl *ar = vif->ar;
502 u32 i;
503
504 if (vif->nw_type != ADHOC_NETWORK)
505 return;
506
507 if (!ar->ibss_ps_enable)
508 return;
509
510 if (eid == ar->ctrl_ep)
511 return;
512
513 if (map_no == 0)
514 return;
515
516 map_no--;
517 ar->node_map[map_no].tx_pend--;
518
519 if (ar->node_map[map_no].tx_pend)
520 return;
521
522 if (map_no != (ar->node_num - 1))
523 return;
524
525 for (i = ar->node_num; i > 0; i--) {
526 if (ar->node_map[i - 1].tx_pend)
527 break;
528
529 memset(&ar->node_map[i - 1], 0,
530 sizeof(struct ath6kl_node_mapping));
531 ar->node_num--;
532 }
533 }
534
535 void ath6kl_tx_complete(void *context, struct list_head *packet_queue)
536 {
537 struct ath6kl *ar = context;
538 struct sk_buff_head skb_queue;
539 struct htc_packet *packet;
540 struct sk_buff *skb;
541 struct ath6kl_cookie *ath6kl_cookie;
542 u32 map_no = 0;
543 int status;
544 enum htc_endpoint_id eid;
545 bool wake_event = false;
546 bool flushing[MAX_NUM_VIF] = {false};
547 u8 if_idx;
548 struct ath6kl_vif *vif;
549
550 skb_queue_head_init(&skb_queue);
551
552 /* lock the driver as we update internal state */
553 spin_lock_bh(&ar->lock);
554
555 /* reap completed packets */
556 while (!list_empty(packet_queue)) {
557
558 packet = list_first_entry(packet_queue, struct htc_packet,
559 list);
560 list_del(&packet->list);
561
562 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
563 if (!ath6kl_cookie)
564 goto fatal;
565
566 status = packet->status;
567 skb = ath6kl_cookie->skb;
568 eid = packet->endpoint;
569 map_no = ath6kl_cookie->map_no;
570
571 if (!skb || !skb->data)
572 goto fatal;
573
574 packet->buf = skb->data;
575
576 __skb_queue_tail(&skb_queue, skb);
577
578 if (!status && (packet->act_len != skb->len))
579 goto fatal;
580
581 ar->tx_pending[eid]--;
582
583 if (eid != ar->ctrl_ep)
584 ar->total_tx_data_pend--;
585
586 if (eid == ar->ctrl_ep) {
587 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
588 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
589
590 if (ar->tx_pending[eid] == 0)
591 wake_event = true;
592 }
593
594 if (eid == ar->ctrl_ep) {
595 if_idx = wmi_cmd_hdr_get_if_idx(
596 (struct wmi_cmd_hdr *) skb->data);
597 } else {
598 if_idx = wmi_data_hdr_get_if_idx(
599 (struct wmi_data_hdr *) skb->data);
600 }
601
602 vif = ath6kl_get_vif_by_index(ar, if_idx);
603 if (!vif) {
604 ath6kl_free_cookie(ar, ath6kl_cookie);
605 continue;
606 }
607
608 if (status) {
609 if (status == -ECANCELED)
610 /* a packet was flushed */
611 flushing[if_idx] = true;
612
613 vif->net_stats.tx_errors++;
614
615 if (status != -ENOSPC && status != -ECANCELED)
616 ath6kl_warn("tx complete error: %d\n", status);
617
618 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
619 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
620 __func__, skb, packet->buf, packet->act_len,
621 eid, "error!");
622 } else {
623 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
624 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
625 __func__, skb, packet->buf, packet->act_len,
626 eid, "OK");
627
628 flushing[if_idx] = false;
629 vif->net_stats.tx_packets++;
630 vif->net_stats.tx_bytes += skb->len;
631 }
632
633 ath6kl_tx_clear_node_map(vif, eid, map_no);
634
635 ath6kl_free_cookie(ar, ath6kl_cookie);
636
637 if (test_bit(NETQ_STOPPED, &vif->flags))
638 clear_bit(NETQ_STOPPED, &vif->flags);
639 }
640
641 spin_unlock_bh(&ar->lock);
642
643 __skb_queue_purge(&skb_queue);
644
645 /* FIXME: Locking */
646 spin_lock_bh(&ar->list_lock);
647 list_for_each_entry(vif, &ar->vif_list, list) {
648 if (test_bit(CONNECTED, &vif->flags) &&
649 !flushing[vif->fw_vif_idx]) {
650 spin_unlock_bh(&ar->list_lock);
651 netif_wake_queue(vif->ndev);
652 spin_lock_bh(&ar->list_lock);
653 }
654 }
655 spin_unlock_bh(&ar->list_lock);
656
657 if (wake_event)
658 wake_up(&ar->event_wq);
659
660 return;
661
662 fatal:
663 WARN_ON(1);
664 spin_unlock_bh(&ar->lock);
665 return;
666 }
667
668 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
669 {
670 int i;
671
672 /* flush all the data (non-control) streams */
673 for (i = 0; i < WMM_NUM_AC; i++)
674 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
675 ATH6KL_DATA_PKT_TAG);
676 }
677
678 /* Rx functions */
679
680 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
681 struct sk_buff *skb)
682 {
683 if (!skb)
684 return;
685
686 skb->dev = dev;
687
688 if (!(skb->dev->flags & IFF_UP)) {
689 dev_kfree_skb(skb);
690 return;
691 }
692
693 skb->protocol = eth_type_trans(skb, skb->dev);
694
695 netif_rx_ni(skb);
696 }
697
698 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
699 {
700 struct sk_buff *skb;
701
702 while (num) {
703 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
704 if (!skb) {
705 ath6kl_err("netbuf allocation failed\n");
706 return;
707 }
708 skb_queue_tail(q, skb);
709 num--;
710 }
711 }
712
713 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
714 {
715 struct sk_buff *skb = NULL;
716
717 if (skb_queue_len(&p_aggr->free_q) < (AGGR_NUM_OF_FREE_NETBUFS >> 2))
718 ath6kl_alloc_netbufs(&p_aggr->free_q, AGGR_NUM_OF_FREE_NETBUFS);
719
720 skb = skb_dequeue(&p_aggr->free_q);
721
722 return skb;
723 }
724
725 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
726 {
727 struct ath6kl *ar = target->dev->ar;
728 struct sk_buff *skb;
729 int rx_buf;
730 int n_buf_refill;
731 struct htc_packet *packet;
732 struct list_head queue;
733
734 n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
735 ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
736
737 if (n_buf_refill <= 0)
738 return;
739
740 INIT_LIST_HEAD(&queue);
741
742 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
743 "%s: providing htc with %d buffers at eid=%d\n",
744 __func__, n_buf_refill, endpoint);
745
746 for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
747 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
748 if (!skb)
749 break;
750
751 packet = (struct htc_packet *) skb->head;
752 if (!IS_ALIGNED((unsigned long) skb->data, 4))
753 skb->data = PTR_ALIGN(skb->data - 4, 4);
754 set_htc_rxpkt_info(packet, skb, skb->data,
755 ATH6KL_BUFFER_SIZE, endpoint);
756 list_add_tail(&packet->list, &queue);
757 }
758
759 if (!list_empty(&queue))
760 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
761 }
762
763 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
764 {
765 struct htc_packet *packet;
766 struct sk_buff *skb;
767
768 while (count) {
769 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
770 if (!skb)
771 return;
772
773 packet = (struct htc_packet *) skb->head;
774 if (!IS_ALIGNED((unsigned long) skb->data, 4))
775 skb->data = PTR_ALIGN(skb->data - 4, 4);
776 set_htc_rxpkt_info(packet, skb, skb->data,
777 ATH6KL_AMSDU_BUFFER_SIZE, 0);
778 spin_lock_bh(&ar->lock);
779 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
780 spin_unlock_bh(&ar->lock);
781 count--;
782 }
783 }
784
785 /*
786 * Callback to allocate a receive buffer for a pending packet. We use a
787 * pre-allocated list of buffers of maximum AMSDU size (4K).
788 */
789 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
790 enum htc_endpoint_id endpoint,
791 int len)
792 {
793 struct ath6kl *ar = target->dev->ar;
794 struct htc_packet *packet = NULL;
795 struct list_head *pkt_pos;
796 int refill_cnt = 0, depth = 0;
797
798 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
799 __func__, endpoint, len);
800
801 if ((len <= ATH6KL_BUFFER_SIZE) ||
802 (len > ATH6KL_AMSDU_BUFFER_SIZE))
803 return NULL;
804
805 spin_lock_bh(&ar->lock);
806
807 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
808 spin_unlock_bh(&ar->lock);
809 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
810 goto refill_buf;
811 }
812
813 packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
814 struct htc_packet, list);
815 list_del(&packet->list);
816 list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
817 depth++;
818
819 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
820 spin_unlock_bh(&ar->lock);
821
822 /* set actual endpoint ID */
823 packet->endpoint = endpoint;
824
825 refill_buf:
826 if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
827 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
828
829 return packet;
830 }
831
832 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
833 struct rxtid *rxtid, struct sk_buff *skb)
834 {
835 struct sk_buff *new_skb;
836 struct ethhdr *hdr;
837 u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
838 u8 *framep;
839
840 mac_hdr_len = sizeof(struct ethhdr);
841 framep = skb->data + mac_hdr_len;
842 amsdu_len = skb->len - mac_hdr_len;
843
844 while (amsdu_len > mac_hdr_len) {
845 hdr = (struct ethhdr *) framep;
846 payload_8023_len = ntohs(hdr->h_proto);
847
848 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
849 payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
850 ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
851 payload_8023_len);
852 break;
853 }
854
855 frame_8023_len = payload_8023_len + mac_hdr_len;
856 new_skb = aggr_get_free_skb(p_aggr);
857 if (!new_skb) {
858 ath6kl_err("no buffer available\n");
859 break;
860 }
861
862 memcpy(new_skb->data, framep, frame_8023_len);
863 skb_put(new_skb, frame_8023_len);
864 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
865 ath6kl_err("dot3_2_dix error\n");
866 dev_kfree_skb(new_skb);
867 break;
868 }
869
870 skb_queue_tail(&rxtid->q, new_skb);
871
872 /* Is this the last subframe within this aggregate ? */
873 if ((amsdu_len - frame_8023_len) == 0)
874 break;
875
876 /* Add the length of A-MSDU subframe padding bytes -
877 * Round to nearest word.
878 */
879 frame_8023_len = ALIGN(frame_8023_len, 4);
880
881 framep += frame_8023_len;
882 amsdu_len -= frame_8023_len;
883 }
884
885 dev_kfree_skb(skb);
886 }
887
888 static void aggr_deque_frms(struct aggr_info *p_aggr, u8 tid,
889 u16 seq_no, u8 order)
890 {
891 struct sk_buff *skb;
892 struct rxtid *rxtid;
893 struct skb_hold_q *node;
894 u16 idx, idx_end, seq_end;
895 struct rxtid_stats *stats;
896
897 if (!p_aggr)
898 return;
899
900 rxtid = &p_aggr->rx_tid[tid];
901 stats = &p_aggr->stat[tid];
902
903 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
904
905 /*
906 * idx_end is typically the last possible frame in the window,
907 * but changes to 'the' seq_no, when BAR comes. If seq_no
908 * is non-zero, we will go up to that and stop.
909 * Note: last seq no in current window will occupy the same
910 * index position as index that is just previous to start.
911 * An imp point : if win_sz is 7, for seq_no space of 4095,
912 * then, there would be holes when sequence wrap around occurs.
913 * Target should judiciously choose the win_sz, based on
914 * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
915 * 2, 4, 8, 16 win_sz works fine).
916 * We must deque from "idx" to "idx_end", including both.
917 */
918 seq_end = seq_no ? seq_no : rxtid->seq_next;
919 idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
920
921 spin_lock_bh(&rxtid->lock);
922
923 do {
924 node = &rxtid->hold_q[idx];
925 if ((order == 1) && (!node->skb))
926 break;
927
928 if (node->skb) {
929 if (node->is_amsdu)
930 aggr_slice_amsdu(p_aggr, rxtid, node->skb);
931 else
932 skb_queue_tail(&rxtid->q, node->skb);
933 node->skb = NULL;
934 } else
935 stats->num_hole++;
936
937 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
938 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
939 } while (idx != idx_end);
940
941 spin_unlock_bh(&rxtid->lock);
942
943 stats->num_delivered += skb_queue_len(&rxtid->q);
944
945 while ((skb = skb_dequeue(&rxtid->q)))
946 ath6kl_deliver_frames_to_nw_stack(p_aggr->dev, skb);
947 }
948
949 static bool aggr_process_recv_frm(struct aggr_info *agg_info, u8 tid,
950 u16 seq_no,
951 bool is_amsdu, struct sk_buff *frame)
952 {
953 struct rxtid *rxtid;
954 struct rxtid_stats *stats;
955 struct sk_buff *skb;
956 struct skb_hold_q *node;
957 u16 idx, st, cur, end;
958 bool is_queued = false;
959 u16 extended_end;
960
961 rxtid = &agg_info->rx_tid[tid];
962 stats = &agg_info->stat[tid];
963
964 stats->num_into_aggr++;
965
966 if (!rxtid->aggr) {
967 if (is_amsdu) {
968 aggr_slice_amsdu(agg_info, rxtid, frame);
969 is_queued = true;
970 stats->num_amsdu++;
971 while ((skb = skb_dequeue(&rxtid->q)))
972 ath6kl_deliver_frames_to_nw_stack(agg_info->dev,
973 skb);
974 }
975 return is_queued;
976 }
977
978 /* Check the incoming sequence no, if it's in the window */
979 st = rxtid->seq_next;
980 cur = seq_no;
981 end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
982
983 if (((st < end) && (cur < st || cur > end)) ||
984 ((st > end) && (cur > end) && (cur < st))) {
985 extended_end = (end + rxtid->hold_q_sz - 1) &
986 ATH6KL_MAX_SEQ_NO;
987
988 if (((end < extended_end) &&
989 (cur < end || cur > extended_end)) ||
990 ((end > extended_end) && (cur > extended_end) &&
991 (cur < end))) {
992 aggr_deque_frms(agg_info, tid, 0, 0);
993 if (cur >= rxtid->hold_q_sz - 1)
994 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
995 else
996 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
997 (rxtid->hold_q_sz - 2 - cur);
998 } else {
999 /*
1000 * Dequeue only those frames that are outside the
1001 * new shifted window.
1002 */
1003 if (cur >= rxtid->hold_q_sz - 1)
1004 st = cur - (rxtid->hold_q_sz - 1);
1005 else
1006 st = ATH6KL_MAX_SEQ_NO -
1007 (rxtid->hold_q_sz - 2 - cur);
1008
1009 aggr_deque_frms(agg_info, tid, st, 0);
1010 }
1011
1012 stats->num_oow++;
1013 }
1014
1015 idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1016
1017 node = &rxtid->hold_q[idx];
1018
1019 spin_lock_bh(&rxtid->lock);
1020
1021 /*
1022 * Is the cur frame duplicate or something beyond our window(hold_q
1023 * -> which is 2x, already)?
1024 *
1025 * 1. Duplicate is easy - drop incoming frame.
1026 * 2. Not falling in current sliding window.
1027 * 2a. is the frame_seq_no preceding current tid_seq_no?
1028 * -> drop the frame. perhaps sender did not get our ACK.
1029 * this is taken care of above.
1030 * 2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1031 * -> Taken care of it above, by moving window forward.
1032 */
1033 dev_kfree_skb(node->skb);
1034 stats->num_dups++;
1035
1036 node->skb = frame;
1037 is_queued = true;
1038 node->is_amsdu = is_amsdu;
1039 node->seq_no = seq_no;
1040
1041 if (node->is_amsdu)
1042 stats->num_amsdu++;
1043 else
1044 stats->num_mpdu++;
1045
1046 spin_unlock_bh(&rxtid->lock);
1047
1048 aggr_deque_frms(agg_info, tid, 0, 1);
1049
1050 if (agg_info->timer_scheduled)
1051 rxtid->progress = true;
1052 else
1053 for (idx = 0 ; idx < rxtid->hold_q_sz; idx++) {
1054 if (rxtid->hold_q[idx].skb) {
1055 /*
1056 * There is a frame in the queue and no
1057 * timer so start a timer to ensure that
1058 * the frame doesn't remain stuck
1059 * forever.
1060 */
1061 agg_info->timer_scheduled = true;
1062 mod_timer(&agg_info->timer,
1063 (jiffies +
1064 HZ * (AGGR_RX_TIMEOUT) / 1000));
1065 rxtid->progress = false;
1066 rxtid->timer_mon = true;
1067 break;
1068 }
1069 }
1070
1071 return is_queued;
1072 }
1073
1074 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1075 {
1076 struct ath6kl *ar = target->dev->ar;
1077 struct sk_buff *skb = packet->pkt_cntxt;
1078 struct wmi_rx_meta_v2 *meta;
1079 struct wmi_data_hdr *dhdr;
1080 int min_hdr_len;
1081 u8 meta_type, dot11_hdr = 0;
1082 int status = packet->status;
1083 enum htc_endpoint_id ept = packet->endpoint;
1084 bool is_amsdu, prev_ps, ps_state = false;
1085 struct ath6kl_sta *conn = NULL;
1086 struct sk_buff *skb1 = NULL;
1087 struct ethhdr *datap = NULL;
1088 struct ath6kl_vif *vif;
1089 u16 seq_no, offset;
1090 u8 tid, if_idx;
1091
1092 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1093 "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1094 __func__, ar, ept, skb, packet->buf,
1095 packet->act_len, status);
1096
1097 if (status || !(skb->data + HTC_HDR_LENGTH)) {
1098 dev_kfree_skb(skb);
1099 return;
1100 }
1101
1102 skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1103 skb_pull(skb, HTC_HDR_LENGTH);
1104
1105 if (ept == ar->ctrl_ep) {
1106 if_idx =
1107 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1108 } else {
1109 if_idx =
1110 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1111 }
1112
1113 vif = ath6kl_get_vif_by_index(ar, if_idx);
1114 if (!vif) {
1115 dev_kfree_skb(skb);
1116 return;
1117 }
1118
1119 /*
1120 * Take lock to protect buffer counts and adaptive power throughput
1121 * state.
1122 */
1123 spin_lock_bh(&vif->if_lock);
1124
1125 vif->net_stats.rx_packets++;
1126 vif->net_stats.rx_bytes += packet->act_len;
1127
1128 spin_unlock_bh(&vif->if_lock);
1129
1130
1131 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1132 skb->data, skb->len);
1133
1134 skb->dev = vif->ndev;
1135
1136 if (!test_bit(WMI_ENABLED, &ar->flag)) {
1137 if (EPPING_ALIGNMENT_PAD > 0)
1138 skb_pull(skb, EPPING_ALIGNMENT_PAD);
1139 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1140 return;
1141 }
1142
1143 ath6kl_check_wow_status(ar);
1144
1145 if (ept == ar->ctrl_ep) {
1146 ath6kl_wmi_control_rx(ar->wmi, skb);
1147 return;
1148 }
1149
1150 min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1151 sizeof(struct ath6kl_llc_snap_hdr);
1152
1153 dhdr = (struct wmi_data_hdr *) skb->data;
1154
1155 /*
1156 * In the case of AP mode we may receive NULL data frames
1157 * that do not have LLC hdr. They are 16 bytes in size.
1158 * Allow these frames in the AP mode.
1159 */
1160 if (vif->nw_type != AP_NETWORK &&
1161 ((packet->act_len < min_hdr_len) ||
1162 (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1163 ath6kl_info("frame len is too short or too long\n");
1164 vif->net_stats.rx_errors++;
1165 vif->net_stats.rx_length_errors++;
1166 dev_kfree_skb(skb);
1167 return;
1168 }
1169
1170 /* Get the Power save state of the STA */
1171 if (vif->nw_type == AP_NETWORK) {
1172 meta_type = wmi_data_hdr_get_meta(dhdr);
1173
1174 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1175 WMI_DATA_HDR_PS_MASK);
1176
1177 offset = sizeof(struct wmi_data_hdr);
1178
1179 switch (meta_type) {
1180 case 0:
1181 break;
1182 case WMI_META_VERSION_1:
1183 offset += sizeof(struct wmi_rx_meta_v1);
1184 break;
1185 case WMI_META_VERSION_2:
1186 offset += sizeof(struct wmi_rx_meta_v2);
1187 break;
1188 default:
1189 break;
1190 }
1191
1192 datap = (struct ethhdr *) (skb->data + offset);
1193 conn = ath6kl_find_sta(vif, datap->h_source);
1194
1195 if (!conn) {
1196 dev_kfree_skb(skb);
1197 return;
1198 }
1199
1200 /*
1201 * If there is a change in PS state of the STA,
1202 * take appropriate steps:
1203 *
1204 * 1. If Sleep-->Awake, flush the psq for the STA
1205 * Clear the PVB for the STA.
1206 * 2. If Awake-->Sleep, Starting queueing frames
1207 * the STA.
1208 */
1209 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1210
1211 if (ps_state)
1212 conn->sta_flags |= STA_PS_SLEEP;
1213 else
1214 conn->sta_flags &= ~STA_PS_SLEEP;
1215
1216 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1217 if (!(conn->sta_flags & STA_PS_SLEEP)) {
1218 struct sk_buff *skbuff = NULL;
1219
1220 spin_lock_bh(&conn->psq_lock);
1221 while ((skbuff = skb_dequeue(&conn->psq))
1222 != NULL) {
1223 spin_unlock_bh(&conn->psq_lock);
1224 ath6kl_data_tx(skbuff, vif->ndev);
1225 spin_lock_bh(&conn->psq_lock);
1226 }
1227 spin_unlock_bh(&conn->psq_lock);
1228 /* Clear the PVB for this STA */
1229 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1230 conn->aid, 0);
1231 }
1232 }
1233
1234 /* drop NULL data frames here */
1235 if ((packet->act_len < min_hdr_len) ||
1236 (packet->act_len >
1237 WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1238 dev_kfree_skb(skb);
1239 return;
1240 }
1241 }
1242
1243 is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1244 tid = wmi_data_hdr_get_up(dhdr);
1245 seq_no = wmi_data_hdr_get_seqno(dhdr);
1246 meta_type = wmi_data_hdr_get_meta(dhdr);
1247 dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1248 skb_pull(skb, sizeof(struct wmi_data_hdr));
1249
1250 switch (meta_type) {
1251 case WMI_META_VERSION_1:
1252 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1253 break;
1254 case WMI_META_VERSION_2:
1255 meta = (struct wmi_rx_meta_v2 *) skb->data;
1256 if (meta->csum_flags & 0x1) {
1257 skb->ip_summed = CHECKSUM_COMPLETE;
1258 skb->csum = (__force __wsum) meta->csum;
1259 }
1260 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1261 break;
1262 default:
1263 break;
1264 }
1265
1266 if (dot11_hdr)
1267 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1268 else if (!is_amsdu)
1269 status = ath6kl_wmi_dot3_2_dix(skb);
1270
1271 if (status) {
1272 /*
1273 * Drop frames that could not be processed (lack of
1274 * memory, etc.)
1275 */
1276 dev_kfree_skb(skb);
1277 return;
1278 }
1279
1280 if (!(vif->ndev->flags & IFF_UP)) {
1281 dev_kfree_skb(skb);
1282 return;
1283 }
1284
1285 if (vif->nw_type == AP_NETWORK) {
1286 datap = (struct ethhdr *) skb->data;
1287 if (is_multicast_ether_addr(datap->h_dest))
1288 /*
1289 * Bcast/Mcast frames should be sent to the
1290 * OS stack as well as on the air.
1291 */
1292 skb1 = skb_copy(skb, GFP_ATOMIC);
1293 else {
1294 /*
1295 * Search for a connected STA with dstMac
1296 * as the Mac address. If found send the
1297 * frame to it on the air else send the
1298 * frame up the stack.
1299 */
1300 conn = ath6kl_find_sta(vif, datap->h_dest);
1301
1302 if (conn && ar->intra_bss) {
1303 skb1 = skb;
1304 skb = NULL;
1305 } else if (conn && !ar->intra_bss) {
1306 dev_kfree_skb(skb);
1307 skb = NULL;
1308 }
1309 }
1310 if (skb1)
1311 ath6kl_data_tx(skb1, vif->ndev);
1312
1313 if (skb == NULL) {
1314 /* nothing to deliver up the stack */
1315 return;
1316 }
1317 }
1318
1319 datap = (struct ethhdr *) skb->data;
1320
1321 if (is_unicast_ether_addr(datap->h_dest) &&
1322 aggr_process_recv_frm(vif->aggr_cntxt, tid, seq_no,
1323 is_amsdu, skb))
1324 /* aggregation code will handle the skb */
1325 return;
1326
1327 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1328 }
1329
1330 static void aggr_timeout(unsigned long arg)
1331 {
1332 u8 i, j;
1333 struct aggr_info *p_aggr = (struct aggr_info *) arg;
1334 struct rxtid *rxtid;
1335 struct rxtid_stats *stats;
1336
1337 for (i = 0; i < NUM_OF_TIDS; i++) {
1338 rxtid = &p_aggr->rx_tid[i];
1339 stats = &p_aggr->stat[i];
1340
1341 if (!rxtid->aggr || !rxtid->timer_mon || rxtid->progress)
1342 continue;
1343
1344 stats->num_timeouts++;
1345 ath6kl_dbg(ATH6KL_DBG_AGGR,
1346 "aggr timeout (st %d end %d)\n",
1347 rxtid->seq_next,
1348 ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1349 ATH6KL_MAX_SEQ_NO));
1350 aggr_deque_frms(p_aggr, i, 0, 0);
1351 }
1352
1353 p_aggr->timer_scheduled = false;
1354
1355 for (i = 0; i < NUM_OF_TIDS; i++) {
1356 rxtid = &p_aggr->rx_tid[i];
1357
1358 if (rxtid->aggr && rxtid->hold_q) {
1359 for (j = 0; j < rxtid->hold_q_sz; j++) {
1360 if (rxtid->hold_q[j].skb) {
1361 p_aggr->timer_scheduled = true;
1362 rxtid->timer_mon = true;
1363 rxtid->progress = false;
1364 break;
1365 }
1366 }
1367
1368 if (j >= rxtid->hold_q_sz)
1369 rxtid->timer_mon = false;
1370 }
1371 }
1372
1373 if (p_aggr->timer_scheduled)
1374 mod_timer(&p_aggr->timer,
1375 jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1376 }
1377
1378 static void aggr_delete_tid_state(struct aggr_info *p_aggr, u8 tid)
1379 {
1380 struct rxtid *rxtid;
1381 struct rxtid_stats *stats;
1382
1383 if (!p_aggr || tid >= NUM_OF_TIDS)
1384 return;
1385
1386 rxtid = &p_aggr->rx_tid[tid];
1387 stats = &p_aggr->stat[tid];
1388
1389 if (rxtid->aggr)
1390 aggr_deque_frms(p_aggr, tid, 0, 0);
1391
1392 rxtid->aggr = false;
1393 rxtid->progress = false;
1394 rxtid->timer_mon = false;
1395 rxtid->win_sz = 0;
1396 rxtid->seq_next = 0;
1397 rxtid->hold_q_sz = 0;
1398
1399 kfree(rxtid->hold_q);
1400 rxtid->hold_q = NULL;
1401
1402 memset(stats, 0, sizeof(struct rxtid_stats));
1403 }
1404
1405 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid, u16 seq_no,
1406 u8 win_sz)
1407 {
1408 struct aggr_info *p_aggr = vif->aggr_cntxt;
1409 struct rxtid *rxtid;
1410 struct rxtid_stats *stats;
1411 u16 hold_q_size;
1412
1413 if (!p_aggr)
1414 return;
1415
1416 rxtid = &p_aggr->rx_tid[tid];
1417 stats = &p_aggr->stat[tid];
1418
1419 if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1420 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1421 __func__, win_sz, tid);
1422
1423 if (rxtid->aggr)
1424 aggr_delete_tid_state(p_aggr, tid);
1425
1426 rxtid->seq_next = seq_no;
1427 hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1428 rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1429 if (!rxtid->hold_q)
1430 return;
1431
1432 rxtid->win_sz = win_sz;
1433 rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1434 if (!skb_queue_empty(&rxtid->q))
1435 return;
1436
1437 rxtid->aggr = true;
1438 }
1439
1440 struct aggr_info *aggr_init(struct net_device *dev)
1441 {
1442 struct aggr_info *p_aggr = NULL;
1443 struct rxtid *rxtid;
1444 u8 i;
1445
1446 p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1447 if (!p_aggr) {
1448 ath6kl_err("failed to alloc memory for aggr_node\n");
1449 return NULL;
1450 }
1451
1452 p_aggr->aggr_sz = AGGR_SZ_DEFAULT;
1453 p_aggr->dev = dev;
1454 init_timer(&p_aggr->timer);
1455 p_aggr->timer.function = aggr_timeout;
1456 p_aggr->timer.data = (unsigned long) p_aggr;
1457
1458 p_aggr->timer_scheduled = false;
1459 skb_queue_head_init(&p_aggr->free_q);
1460
1461 ath6kl_alloc_netbufs(&p_aggr->free_q, AGGR_NUM_OF_FREE_NETBUFS);
1462
1463 for (i = 0; i < NUM_OF_TIDS; i++) {
1464 rxtid = &p_aggr->rx_tid[i];
1465 rxtid->aggr = false;
1466 rxtid->progress = false;
1467 rxtid->timer_mon = false;
1468 skb_queue_head_init(&rxtid->q);
1469 spin_lock_init(&rxtid->lock);
1470 }
1471
1472 return p_aggr;
1473 }
1474
1475 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid)
1476 {
1477 struct aggr_info *p_aggr = vif->aggr_cntxt;
1478 struct rxtid *rxtid;
1479
1480 if (!p_aggr)
1481 return;
1482
1483 rxtid = &p_aggr->rx_tid[tid];
1484
1485 if (rxtid->aggr)
1486 aggr_delete_tid_state(p_aggr, tid);
1487 }
1488
1489 void aggr_reset_state(struct aggr_info *aggr_info)
1490 {
1491 u8 tid;
1492
1493 for (tid = 0; tid < NUM_OF_TIDS; tid++)
1494 aggr_delete_tid_state(aggr_info, tid);
1495 }
1496
1497 /* clean up our amsdu buffer list */
1498 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1499 {
1500 struct htc_packet *packet, *tmp_pkt;
1501
1502 spin_lock_bh(&ar->lock);
1503 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1504 spin_unlock_bh(&ar->lock);
1505 return;
1506 }
1507
1508 list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1509 list) {
1510 list_del(&packet->list);
1511 spin_unlock_bh(&ar->lock);
1512 dev_kfree_skb(packet->pkt_cntxt);
1513 spin_lock_bh(&ar->lock);
1514 }
1515
1516 spin_unlock_bh(&ar->lock);
1517 }
1518
1519 void aggr_module_destroy(struct aggr_info *aggr_info)
1520 {
1521 struct rxtid *rxtid;
1522 u8 i, k;
1523
1524 if (!aggr_info)
1525 return;
1526
1527 if (aggr_info->timer_scheduled) {
1528 del_timer(&aggr_info->timer);
1529 aggr_info->timer_scheduled = false;
1530 }
1531
1532 for (i = 0; i < NUM_OF_TIDS; i++) {
1533 rxtid = &aggr_info->rx_tid[i];
1534 if (rxtid->hold_q) {
1535 for (k = 0; k < rxtid->hold_q_sz; k++)
1536 dev_kfree_skb(rxtid->hold_q[k].skb);
1537 kfree(rxtid->hold_q);
1538 }
1539
1540 skb_queue_purge(&rxtid->q);
1541 }
1542
1543 skb_queue_purge(&aggr_info->free_q);
1544 kfree(aggr_info);
1545 }
Linux kernel - Deliverables
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