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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / wireless / ath / ath6kl / txrx.c
blobb22ed499f7ba7164dd96ab9bfdbf76979df9d483
1 /*
2 * Copyright (c) 2004-2011 Atheros Communications Inc.
3 * Copyright (c) 2011-2012 Qualcomm Atheros, Inc.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include "core.h"
21 #include "debug.h"
22 #include "htc-ops.h"
23 #include "trace.h"
24
25 /*
26 * tid - tid_mux0..tid_mux3
27 * aid - tid_mux4..tid_mux7
28 */
29 #define ATH6KL_TID_MASK 0xf
30 #define ATH6KL_AID_SHIFT 4
31
32 static inline u8 ath6kl_get_tid(u8 tid_mux)
33 {
34 return tid_mux & ATH6KL_TID_MASK;
35 }
36
37 static inline u8 ath6kl_get_aid(u8 tid_mux)
38 {
39 return tid_mux >> ATH6KL_AID_SHIFT;
40 }
41
42 static u8 ath6kl_ibss_map_epid(struct sk_buff *skb, struct net_device *dev,
43 u32 *map_no)
44 {
45 struct ath6kl *ar = ath6kl_priv(dev);
46 struct ethhdr *eth_hdr;
47 u32 i, ep_map = -1;
48 u8 *datap;
49
50 *map_no = 0;
51 datap = skb->data;
52 eth_hdr = (struct ethhdr *) (datap + sizeof(struct wmi_data_hdr));
53
54 if (is_multicast_ether_addr(eth_hdr->h_dest))
55 return ENDPOINT_2;
56
57 for (i = 0; i < ar->node_num; i++) {
58 if (memcmp(eth_hdr->h_dest, ar->node_map[i].mac_addr,
59 ETH_ALEN) == 0) {
60 *map_no = i + 1;
61 ar->node_map[i].tx_pend++;
62 return ar->node_map[i].ep_id;
63 }
64
65 if ((ep_map == -1) && !ar->node_map[i].tx_pend)
66 ep_map = i;
67 }
68
69 if (ep_map == -1) {
70 ep_map = ar->node_num;
71 ar->node_num++;
72 if (ar->node_num > MAX_NODE_NUM)
73 return ENDPOINT_UNUSED;
74 }
75
76 memcpy(ar->node_map[ep_map].mac_addr, eth_hdr->h_dest, ETH_ALEN);
77
78 for (i = ENDPOINT_2; i <= ENDPOINT_5; i++) {
79 if (!ar->tx_pending[i]) {
80 ar->node_map[ep_map].ep_id = i;
81 break;
82 }
83
84 /*
85 * No free endpoint is available, start redistribution on
86 * the inuse endpoints.
87 */
88 if (i == ENDPOINT_5) {
89 ar->node_map[ep_map].ep_id = ar->next_ep_id;
90 ar->next_ep_id++;
91 if (ar->next_ep_id > ENDPOINT_5)
92 ar->next_ep_id = ENDPOINT_2;
93 }
94 }
95
96 *map_no = ep_map + 1;
97 ar->node_map[ep_map].tx_pend++;
98
99 return ar->node_map[ep_map].ep_id;
100 }
101
102 static bool ath6kl_process_uapsdq(struct ath6kl_sta *conn,
103 struct ath6kl_vif *vif,
104 struct sk_buff *skb,
105 u32 *flags)
106 {
107 struct ath6kl *ar = vif->ar;
108 bool is_apsdq_empty = false;
109 struct ethhdr *datap = (struct ethhdr *) skb->data;
110 u8 up = 0, traffic_class, *ip_hdr;
111 u16 ether_type;
112 struct ath6kl_llc_snap_hdr *llc_hdr;
113
114 if (conn->sta_flags & STA_PS_APSD_TRIGGER) {
115 /*
116 * This tx is because of a uAPSD trigger, determine
117 * more and EOSP bit. Set EOSP if queue is empty
118 * or sufficient frames are delivered for this trigger.
119 */
120 spin_lock_bh(&conn->psq_lock);
121 if (!skb_queue_empty(&conn->apsdq))
122 *flags |= WMI_DATA_HDR_FLAGS_MORE;
123 else if (conn->sta_flags & STA_PS_APSD_EOSP)
124 *flags |= WMI_DATA_HDR_FLAGS_EOSP;
125 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
126 spin_unlock_bh(&conn->psq_lock);
127 return false;
128 } else if (!conn->apsd_info) {
129 return false;
130 }
131
132 if (test_bit(WMM_ENABLED, &vif->flags)) {
133 ether_type = be16_to_cpu(datap->h_proto);
134 if (is_ethertype(ether_type)) {
135 /* packet is in DIX format */
136 ip_hdr = (u8 *)(datap + 1);
137 } else {
138 /* packet is in 802.3 format */
139 llc_hdr = (struct ath6kl_llc_snap_hdr *)
140 (datap + 1);
141 ether_type = be16_to_cpu(llc_hdr->eth_type);
142 ip_hdr = (u8 *)(llc_hdr + 1);
143 }
144
145 if (ether_type == IP_ETHERTYPE)
146 up = ath6kl_wmi_determine_user_priority(
147 ip_hdr, 0);
148 }
149
150 traffic_class = ath6kl_wmi_get_traffic_class(up);
151
152 if ((conn->apsd_info & (1 << traffic_class)) == 0)
153 return false;
154
155 /* Queue the frames if the STA is sleeping */
156 spin_lock_bh(&conn->psq_lock);
157 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
158 skb_queue_tail(&conn->apsdq, skb);
159 spin_unlock_bh(&conn->psq_lock);
160
161 /*
162 * If this is the first pkt getting queued
163 * for this STA, update the PVB for this STA
164 */
165 if (is_apsdq_empty) {
166 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
167 vif->fw_vif_idx,
168 conn->aid, 1, 0);
169 }
170 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
171
172 return true;
173 }
174
175 static bool ath6kl_process_psq(struct ath6kl_sta *conn,
176 struct ath6kl_vif *vif,
177 struct sk_buff *skb,
178 u32 *flags)
179 {
180 bool is_psq_empty = false;
181 struct ath6kl *ar = vif->ar;
182
183 if (conn->sta_flags & STA_PS_POLLED) {
184 spin_lock_bh(&conn->psq_lock);
185 if (!skb_queue_empty(&conn->psq))
186 *flags |= WMI_DATA_HDR_FLAGS_MORE;
187 spin_unlock_bh(&conn->psq_lock);
188 return false;
189 }
190
191 /* Queue the frames if the STA is sleeping */
192 spin_lock_bh(&conn->psq_lock);
193 is_psq_empty = skb_queue_empty(&conn->psq);
194 skb_queue_tail(&conn->psq, skb);
195 spin_unlock_bh(&conn->psq_lock);
196
197 /*
198 * If this is the first pkt getting queued
199 * for this STA, update the PVB for this
200 * STA.
201 */
202 if (is_psq_empty)
203 ath6kl_wmi_set_pvb_cmd(ar->wmi,
204 vif->fw_vif_idx,
205 conn->aid, 1);
206 return true;
207 }
208
209 static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb,
210 u32 *flags)
211 {
212 struct ethhdr *datap = (struct ethhdr *) skb->data;
213 struct ath6kl_sta *conn = NULL;
214 bool ps_queued = false;
215 struct ath6kl *ar = vif->ar;
216
217 if (is_multicast_ether_addr(datap->h_dest)) {
218 u8 ctr = 0;
219 bool q_mcast = false;
220
221 for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
222 if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) {
223 q_mcast = true;
224 break;
225 }
226 }
227
228 if (q_mcast) {
229 /*
230 * If this transmit is not because of a Dtim Expiry
231 * q it.
232 */
233 if (!test_bit(DTIM_EXPIRED, &vif->flags)) {
234 bool is_mcastq_empty = false;
235
236 spin_lock_bh(&ar->mcastpsq_lock);
237 is_mcastq_empty =
238 skb_queue_empty(&ar->mcastpsq);
239 skb_queue_tail(&ar->mcastpsq, skb);
240 spin_unlock_bh(&ar->mcastpsq_lock);
241
242 /*
243 * If this is the first Mcast pkt getting
244 * queued indicate to the target to set the
245 * BitmapControl LSB of the TIM IE.
246 */
247 if (is_mcastq_empty)
248 ath6kl_wmi_set_pvb_cmd(ar->wmi,
249 vif->fw_vif_idx,
250 MCAST_AID, 1);
251
252 ps_queued = true;
253 } else {
254 /*
255 * This transmit is because of Dtim expiry.
256 * Determine if MoreData bit has to be set.
257 */
258 spin_lock_bh(&ar->mcastpsq_lock);
259 if (!skb_queue_empty(&ar->mcastpsq))
260 *flags |= WMI_DATA_HDR_FLAGS_MORE;
261 spin_unlock_bh(&ar->mcastpsq_lock);
262 }
263 }
264 } else {
265 conn = ath6kl_find_sta(vif, datap->h_dest);
266 if (!conn) {
267 dev_kfree_skb(skb);
268
269 /* Inform the caller that the skb is consumed */
270 return true;
271 }
272
273 if (conn->sta_flags & STA_PS_SLEEP) {
274 ps_queued = ath6kl_process_uapsdq(conn,
275 vif, skb, flags);
276 if (!(*flags & WMI_DATA_HDR_FLAGS_UAPSD))
277 ps_queued = ath6kl_process_psq(conn,
278 vif, skb, flags);
279 }
280 }
281 return ps_queued;
282 }
283
284 /* Tx functions */
285
286 int ath6kl_control_tx(void *devt, struct sk_buff *skb,
287 enum htc_endpoint_id eid)
288 {
289 struct ath6kl *ar = devt;
290 int status = 0;
291 struct ath6kl_cookie *cookie = NULL;
292
293 trace_ath6kl_wmi_cmd(skb->data, skb->len);
294
295 if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW)) {
296 dev_kfree_skb(skb);
297 return -EACCES;
298 }
299
300 if (WARN_ON_ONCE(eid == ENDPOINT_UNUSED ||
301 eid >= ENDPOINT_MAX)) {
302 status = -EINVAL;
303 goto fail_ctrl_tx;
304 }
305
306 spin_lock_bh(&ar->lock);
307
308 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
309 "%s: skb=0x%p, len=0x%x eid =%d\n", __func__,
310 skb, skb->len, eid);
311
312 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) {
313 /*
314 * Control endpoint is full, don't allocate resources, we
315 * are just going to drop this packet.
316 */
317 cookie = NULL;
318 ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n",
319 skb, skb->len);
320 } else {
321 cookie = ath6kl_alloc_cookie(ar);
322 }
323
324 if (cookie == NULL) {
325 spin_unlock_bh(&ar->lock);
326 status = -ENOMEM;
327 goto fail_ctrl_tx;
328 }
329
330 ar->tx_pending[eid]++;
331
332 if (eid != ar->ctrl_ep)
333 ar->total_tx_data_pend++;
334
335 spin_unlock_bh(&ar->lock);
336
337 cookie->skb = skb;
338 cookie->map_no = 0;
339 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
340 eid, ATH6KL_CONTROL_PKT_TAG);
341 cookie->htc_pkt.skb = skb;
342
343 /*
344 * This interface is asynchronous, if there is an error, cleanup
345 * will happen in the TX completion callback.
346 */
347 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
348
349 return 0;
350
351 fail_ctrl_tx:
352 dev_kfree_skb(skb);
353 return status;
354 }
355
356 netdev_tx_t ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
357 {
358 struct ath6kl *ar = ath6kl_priv(dev);
359 struct ath6kl_cookie *cookie = NULL;
360 enum htc_endpoint_id eid = ENDPOINT_UNUSED;
361 struct ath6kl_vif *vif = netdev_priv(dev);
362 u32 map_no = 0;
363 u16 htc_tag = ATH6KL_DATA_PKT_TAG;
364 u8 ac = 99; /* initialize to unmapped ac */
365 bool chk_adhoc_ps_mapping = false;
366 int ret;
367 struct wmi_tx_meta_v2 meta_v2;
368 void *meta;
369 u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed;
370 u8 meta_ver = 0;
371 u32 flags = 0;
372
373 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
374 "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
375 skb, skb->data, skb->len);
376
377 /* If target is not associated */
378 if (!test_bit(CONNECTED, &vif->flags))
379 goto fail_tx;
380
381 if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON))
382 goto fail_tx;
383
384 if (!test_bit(WMI_READY, &ar->flag))
385 goto fail_tx;
386
387 /* AP mode Power saving processing */
388 if (vif->nw_type == AP_NETWORK) {
389 if (ath6kl_powersave_ap(vif, skb, &flags))
390 return 0;
391 }
392
393 if (test_bit(WMI_ENABLED, &ar->flag)) {
394 if ((dev->features & NETIF_F_IP_CSUM) &&
395 (csum == CHECKSUM_PARTIAL)) {
396 csum_start = skb->csum_start -
397 (skb_network_header(skb) - skb->head) +
398 sizeof(struct ath6kl_llc_snap_hdr);
399 csum_dest = skb->csum_offset + csum_start;
400 }
401
402 if (skb_cow_head(skb, dev->needed_headroom)) {
403 dev->stats.tx_dropped++;
404 kfree_skb(skb);
405 return 0;
406 }
407
408 if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) {
409 ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n");
410 goto fail_tx;
411 }
412
413 if ((dev->features & NETIF_F_IP_CSUM) &&
414 (csum == CHECKSUM_PARTIAL)) {
415 meta_v2.csum_start = csum_start;
416 meta_v2.csum_dest = csum_dest;
417
418 /* instruct target to calculate checksum */
419 meta_v2.csum_flags = WMI_META_V2_FLAG_CSUM_OFFLOAD;
420 meta_ver = WMI_META_VERSION_2;
421 meta = &meta_v2;
422 } else {
423 meta_ver = 0;
424 meta = NULL;
425 }
426
427 ret = ath6kl_wmi_data_hdr_add(ar->wmi, skb,
428 DATA_MSGTYPE, flags, 0,
429 meta_ver,
430 meta, vif->fw_vif_idx);
431
432 if (ret) {
433 ath6kl_warn("failed to add wmi data header:%d\n"
434 , ret);
435 goto fail_tx;
436 }
437
438 if ((vif->nw_type == ADHOC_NETWORK) &&
439 ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags))
440 chk_adhoc_ps_mapping = true;
441 else {
442 /* get the stream mapping */
443 ret = ath6kl_wmi_implicit_create_pstream(ar->wmi,
444 vif->fw_vif_idx, skb,
445 0, test_bit(WMM_ENABLED, &vif->flags), &ac);
446 if (ret)
447 goto fail_tx;
448 }
449 } else {
450 goto fail_tx;
451 }
452
453 spin_lock_bh(&ar->lock);
454
455 if (chk_adhoc_ps_mapping)
456 eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
457 else
458 eid = ar->ac2ep_map[ac];
459
460 if (eid == 0 || eid == ENDPOINT_UNUSED) {
461 ath6kl_err("eid %d is not mapped!\n", eid);
462 spin_unlock_bh(&ar->lock);
463 goto fail_tx;
464 }
465
466 /* allocate resource for this packet */
467 cookie = ath6kl_alloc_cookie(ar);
468
469 if (!cookie) {
470 spin_unlock_bh(&ar->lock);
471 goto fail_tx;
472 }
473
474 /* update counts while the lock is held */
475 ar->tx_pending[eid]++;
476 ar->total_tx_data_pend++;
477
478 spin_unlock_bh(&ar->lock);
479
480 if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
481 skb_cloned(skb)) {
482 /*
483 * We will touch (move the buffer data to align it. Since the
484 * skb buffer is cloned and not only the header is changed, we
485 * have to copy it to allow the changes. Since we are copying
486 * the data here, we may as well align it by reserving suitable
487 * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
488 */
489 struct sk_buff *nskb;
490
491 nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
492 if (nskb == NULL)
493 goto fail_tx;
494 kfree_skb(skb);
495 skb = nskb;
496 }
497
498 cookie->skb = skb;
499 cookie->map_no = map_no;
500 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
501 eid, htc_tag);
502 cookie->htc_pkt.skb = skb;
503
504 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
505 skb->data, skb->len);
506
507 /*
508 * HTC interface is asynchronous, if this fails, cleanup will
509 * happen in the ath6kl_tx_complete callback.
510 */
511 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
512
513 return 0;
514
515 fail_tx:
516 dev_kfree_skb(skb);
517
518 dev->stats.tx_dropped++;
519 dev->stats.tx_aborted_errors++;
520
521 return 0;
522 }
523
524 /* indicate tx activity or inactivity on a WMI stream */
525 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
526 {
527 struct ath6kl *ar = devt;
528 enum htc_endpoint_id eid;
529 int i;
530
531 eid = ar->ac2ep_map[traffic_class];
532
533 if (!test_bit(WMI_ENABLED, &ar->flag))
534 goto notify_htc;
535
536 spin_lock_bh(&ar->lock);
537
538 ar->ac_stream_active[traffic_class] = active;
539
540 if (active) {
541 /*
542 * Keep track of the active stream with the highest
543 * priority.
544 */
545 if (ar->ac_stream_pri_map[traffic_class] >
546 ar->hiac_stream_active_pri)
547 /* set the new highest active priority */
548 ar->hiac_stream_active_pri =
549 ar->ac_stream_pri_map[traffic_class];
550
551 } else {
552 /*
553 * We may have to search for the next active stream
554 * that is the highest priority.
555 */
556 if (ar->hiac_stream_active_pri ==
557 ar->ac_stream_pri_map[traffic_class]) {
558 /*
559 * The highest priority stream just went inactive
560 * reset and search for the "next" highest "active"
561 * priority stream.
562 */
563 ar->hiac_stream_active_pri = 0;
564
565 for (i = 0; i < WMM_NUM_AC; i++) {
566 if (ar->ac_stream_active[i] &&
567 (ar->ac_stream_pri_map[i] >
568 ar->hiac_stream_active_pri))
569 /*
570 * Set the new highest active
571 * priority.
572 */
573 ar->hiac_stream_active_pri =
574 ar->ac_stream_pri_map[i];
575 }
576 }
577 }
578
579 spin_unlock_bh(&ar->lock);
580
581 notify_htc:
582 /* notify HTC, this may cause credit distribution changes */
583 ath6kl_htc_activity_changed(ar->htc_target, eid, active);
584 }
585
586 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
587 struct htc_packet *packet)
588 {
589 struct ath6kl *ar = target->dev->ar;
590 struct ath6kl_vif *vif;
591 enum htc_endpoint_id endpoint = packet->endpoint;
592 enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
593
594 if (endpoint == ar->ctrl_ep) {
595 /*
596 * Under normal WMI if this is getting full, then something
597 * is running rampant the host should not be exhausting the
598 * WMI queue with too many commands the only exception to
599 * this is during testing using endpointping.
600 */
601 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
602 ath6kl_err("wmi ctrl ep is full\n");
603 ath6kl_recovery_err_notify(ar, ATH6KL_FW_EP_FULL);
604 return action;
605 }
606
607 if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
608 return action;
609
610 /*
611 * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
612 * the highest active stream.
613 */
614 if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
615 ar->hiac_stream_active_pri &&
616 ar->cookie_count <=
617 target->endpoint[endpoint].tx_drop_packet_threshold)
618 /*
619 * Give preference to the highest priority stream by
620 * dropping the packets which overflowed.
621 */
622 action = HTC_SEND_FULL_DROP;
623
624 /* FIXME: Locking */
625 spin_lock_bh(&ar->list_lock);
626 list_for_each_entry(vif, &ar->vif_list, list) {
627 if (vif->nw_type == ADHOC_NETWORK ||
628 action != HTC_SEND_FULL_DROP) {
629 spin_unlock_bh(&ar->list_lock);
630
631 set_bit(NETQ_STOPPED, &vif->flags);
632 netif_stop_queue(vif->ndev);
633
634 return action;
635 }
636 }
637 spin_unlock_bh(&ar->list_lock);
638
639 return action;
640 }
641
642 /* TODO this needs to be looked at */
643 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
644 enum htc_endpoint_id eid, u32 map_no)
645 {
646 struct ath6kl *ar = vif->ar;
647 u32 i;
648
649 if (vif->nw_type != ADHOC_NETWORK)
650 return;
651
652 if (!ar->ibss_ps_enable)
653 return;
654
655 if (eid == ar->ctrl_ep)
656 return;
657
658 if (map_no == 0)
659 return;
660
661 map_no--;
662 ar->node_map[map_no].tx_pend--;
663
664 if (ar->node_map[map_no].tx_pend)
665 return;
666
667 if (map_no != (ar->node_num - 1))
668 return;
669
670 for (i = ar->node_num; i > 0; i--) {
671 if (ar->node_map[i - 1].tx_pend)
672 break;
673
674 memset(&ar->node_map[i - 1], 0,
675 sizeof(struct ath6kl_node_mapping));
676 ar->node_num--;
677 }
678 }
679
680 void ath6kl_tx_complete(struct htc_target *target,
681 struct list_head *packet_queue)
682 {
683 struct ath6kl *ar = target->dev->ar;
684 struct sk_buff_head skb_queue;
685 struct htc_packet *packet;
686 struct sk_buff *skb;
687 struct ath6kl_cookie *ath6kl_cookie;
688 u32 map_no = 0;
689 int status;
690 enum htc_endpoint_id eid;
691 bool wake_event = false;
692 bool flushing[ATH6KL_VIF_MAX] = {false};
693 u8 if_idx;
694 struct ath6kl_vif *vif;
695
696 skb_queue_head_init(&skb_queue);
697
698 /* lock the driver as we update internal state */
699 spin_lock_bh(&ar->lock);
700
701 /* reap completed packets */
702 while (!list_empty(packet_queue)) {
703 packet = list_first_entry(packet_queue, struct htc_packet,
704 list);
705 list_del(&packet->list);
706
707 if (WARN_ON_ONCE(packet->endpoint == ENDPOINT_UNUSED ||
708 packet->endpoint >= ENDPOINT_MAX))
709 continue;
710
711 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
712 if (WARN_ON_ONCE(!ath6kl_cookie))
713 continue;
714
715 status = packet->status;
716 skb = ath6kl_cookie->skb;
717 eid = packet->endpoint;
718 map_no = ath6kl_cookie->map_no;
719
720 if (WARN_ON_ONCE(!skb || !skb->data)) {
721 dev_kfree_skb(skb);
722 ath6kl_free_cookie(ar, ath6kl_cookie);
723 continue;
724 }
725
726 __skb_queue_tail(&skb_queue, skb);
727
728 if (WARN_ON_ONCE(!status && (packet->act_len != skb->len))) {
729 ath6kl_free_cookie(ar, ath6kl_cookie);
730 continue;
731 }
732
733 ar->tx_pending[eid]--;
734
735 if (eid != ar->ctrl_ep)
736 ar->total_tx_data_pend--;
737
738 if (eid == ar->ctrl_ep) {
739 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
740 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
741
742 if (ar->tx_pending[eid] == 0)
743 wake_event = true;
744 }
745
746 if (eid == ar->ctrl_ep) {
747 if_idx = wmi_cmd_hdr_get_if_idx(
748 (struct wmi_cmd_hdr *) packet->buf);
749 } else {
750 if_idx = wmi_data_hdr_get_if_idx(
751 (struct wmi_data_hdr *) packet->buf);
752 }
753
754 vif = ath6kl_get_vif_by_index(ar, if_idx);
755 if (!vif) {
756 ath6kl_free_cookie(ar, ath6kl_cookie);
757 continue;
758 }
759
760 if (status) {
761 if (status == -ECANCELED)
762 /* a packet was flushed */
763 flushing[if_idx] = true;
764
765 vif->ndev->stats.tx_errors++;
766
767 if (status != -ENOSPC && status != -ECANCELED)
768 ath6kl_warn("tx complete error: %d\n", status);
769
770 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
771 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
772 __func__, skb, packet->buf, packet->act_len,
773 eid, "error!");
774 } else {
775 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
776 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
777 __func__, skb, packet->buf, packet->act_len,
778 eid, "OK");
779
780 flushing[if_idx] = false;
781 vif->ndev->stats.tx_packets++;
782 vif->ndev->stats.tx_bytes += skb->len;
783 }
784
785 ath6kl_tx_clear_node_map(vif, eid, map_no);
786
787 ath6kl_free_cookie(ar, ath6kl_cookie);
788
789 if (test_bit(NETQ_STOPPED, &vif->flags))
790 clear_bit(NETQ_STOPPED, &vif->flags);
791 }
792
793 spin_unlock_bh(&ar->lock);
794
795 __skb_queue_purge(&skb_queue);
796
797 /* FIXME: Locking */
798 spin_lock_bh(&ar->list_lock);
799 list_for_each_entry(vif, &ar->vif_list, list) {
800 if (test_bit(CONNECTED, &vif->flags) &&
801 !flushing[vif->fw_vif_idx]) {
802 spin_unlock_bh(&ar->list_lock);
803 netif_wake_queue(vif->ndev);
804 spin_lock_bh(&ar->list_lock);
805 }
806 }
807 spin_unlock_bh(&ar->list_lock);
808
809 if (wake_event)
810 wake_up(&ar->event_wq);
811
812 return;
813 }
814
815 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
816 {
817 int i;
818
819 /* flush all the data (non-control) streams */
820 for (i = 0; i < WMM_NUM_AC; i++)
821 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
822 ATH6KL_DATA_PKT_TAG);
823 }
824
825 /* Rx functions */
826
827 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
828 struct sk_buff *skb)
829 {
830 if (!skb)
831 return;
832
833 skb->dev = dev;
834
835 if (!(skb->dev->flags & IFF_UP)) {
836 dev_kfree_skb(skb);
837 return;
838 }
839
840 skb->protocol = eth_type_trans(skb, skb->dev);
841
842 netif_rx_ni(skb);
843 }
844
845 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
846 {
847 struct sk_buff *skb;
848
849 while (num) {
850 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
851 if (!skb) {
852 ath6kl_err("netbuf allocation failed\n");
853 return;
854 }
855 skb_queue_tail(q, skb);
856 num--;
857 }
858 }
859
860 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
861 {
862 struct sk_buff *skb = NULL;
863
864 if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
865 (AGGR_NUM_OF_FREE_NETBUFS >> 2))
866 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
867 AGGR_NUM_OF_FREE_NETBUFS);
868
869 skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
870
871 return skb;
872 }
873
874 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
875 {
876 struct ath6kl *ar = target->dev->ar;
877 struct sk_buff *skb;
878 int rx_buf;
879 int n_buf_refill;
880 struct htc_packet *packet;
881 struct list_head queue;
882
883 n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
884 ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
885
886 if (n_buf_refill <= 0)
887 return;
888
889 INIT_LIST_HEAD(&queue);
890
891 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
892 "%s: providing htc with %d buffers at eid=%d\n",
893 __func__, n_buf_refill, endpoint);
894
895 for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
896 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
897 if (!skb)
898 break;
899
900 packet = (struct htc_packet *) skb->head;
901 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
902 size_t len = skb_headlen(skb);
903 skb->data = PTR_ALIGN(skb->data - 4, 4);
904 skb_set_tail_pointer(skb, len);
905 }
906 set_htc_rxpkt_info(packet, skb, skb->data,
907 ATH6KL_BUFFER_SIZE, endpoint);
908 packet->skb = skb;
909 list_add_tail(&packet->list, &queue);
910 }
911
912 if (!list_empty(&queue))
913 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
914 }
915
916 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
917 {
918 struct htc_packet *packet;
919 struct sk_buff *skb;
920
921 while (count) {
922 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
923 if (!skb)
924 return;
925
926 packet = (struct htc_packet *) skb->head;
927 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
928 size_t len = skb_headlen(skb);
929 skb->data = PTR_ALIGN(skb->data - 4, 4);
930 skb_set_tail_pointer(skb, len);
931 }
932 set_htc_rxpkt_info(packet, skb, skb->data,
933 ATH6KL_AMSDU_BUFFER_SIZE, 0);
934 packet->skb = skb;
935
936 spin_lock_bh(&ar->lock);
937 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
938 spin_unlock_bh(&ar->lock);
939 count--;
940 }
941 }
942
943 /*
944 * Callback to allocate a receive buffer for a pending packet. We use a
945 * pre-allocated list of buffers of maximum AMSDU size (4K).
946 */
947 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
948 enum htc_endpoint_id endpoint,
949 int len)
950 {
951 struct ath6kl *ar = target->dev->ar;
952 struct htc_packet *packet = NULL;
953 struct list_head *pkt_pos;
954 int refill_cnt = 0, depth = 0;
955
956 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
957 __func__, endpoint, len);
958
959 if ((len <= ATH6KL_BUFFER_SIZE) ||
960 (len > ATH6KL_AMSDU_BUFFER_SIZE))
961 return NULL;
962
963 spin_lock_bh(&ar->lock);
964
965 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
966 spin_unlock_bh(&ar->lock);
967 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
968 goto refill_buf;
969 }
970
971 packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
972 struct htc_packet, list);
973 list_del(&packet->list);
974 list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
975 depth++;
976
977 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
978 spin_unlock_bh(&ar->lock);
979
980 /* set actual endpoint ID */
981 packet->endpoint = endpoint;
982
983 refill_buf:
984 if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
985 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
986
987 return packet;
988 }
989
990 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
991 struct rxtid *rxtid, struct sk_buff *skb)
992 {
993 struct sk_buff *new_skb;
994 struct ethhdr *hdr;
995 u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
996 u8 *framep;
997
998 mac_hdr_len = sizeof(struct ethhdr);
999 framep = skb->data + mac_hdr_len;
1000 amsdu_len = skb->len - mac_hdr_len;
1001
1002 while (amsdu_len > mac_hdr_len) {
1003 hdr = (struct ethhdr *) framep;
1004 payload_8023_len = be16_to_cpu(hdr->h_proto);
1005
1006 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
1007 payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
1008 ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
1009 payload_8023_len);
1010 break;
1011 }
1012
1013 frame_8023_len = payload_8023_len + mac_hdr_len;
1014 new_skb = aggr_get_free_skb(p_aggr);
1015 if (!new_skb) {
1016 ath6kl_err("no buffer available\n");
1017 break;
1018 }
1019
1020 memcpy(new_skb->data, framep, frame_8023_len);
1021 skb_put(new_skb, frame_8023_len);
1022 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
1023 ath6kl_err("dot3_2_dix error\n");
1024 dev_kfree_skb(new_skb);
1025 break;
1026 }
1027
1028 skb_queue_tail(&rxtid->q, new_skb);
1029
1030 /* Is this the last subframe within this aggregate ? */
1031 if ((amsdu_len - frame_8023_len) == 0)
1032 break;
1033
1034 /* Add the length of A-MSDU subframe padding bytes -
1035 * Round to nearest word.
1036 */
1037 frame_8023_len = ALIGN(frame_8023_len, 4);
1038
1039 framep += frame_8023_len;
1040 amsdu_len -= frame_8023_len;
1041 }
1042
1043 dev_kfree_skb(skb);
1044 }
1045
1046 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1047 u16 seq_no, u8 order)
1048 {
1049 struct sk_buff *skb;
1050 struct rxtid *rxtid;
1051 struct skb_hold_q *node;
1052 u16 idx, idx_end, seq_end;
1053 struct rxtid_stats *stats;
1054
1055 rxtid = &agg_conn->rx_tid[tid];
1056 stats = &agg_conn->stat[tid];
1057
1058 spin_lock_bh(&rxtid->lock);
1059 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1060
1061 /*
1062 * idx_end is typically the last possible frame in the window,
1063 * but changes to 'the' seq_no, when BAR comes. If seq_no
1064 * is non-zero, we will go up to that and stop.
1065 * Note: last seq no in current window will occupy the same
1066 * index position as index that is just previous to start.
1067 * An imp point : if win_sz is 7, for seq_no space of 4095,
1068 * then, there would be holes when sequence wrap around occurs.
1069 * Target should judiciously choose the win_sz, based on
1070 * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1071 * 2, 4, 8, 16 win_sz works fine).
1072 * We must deque from "idx" to "idx_end", including both.
1073 */
1074 seq_end = seq_no ? seq_no : rxtid->seq_next;
1075 idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1076
1077 do {
1078 node = &rxtid->hold_q[idx];
1079 if ((order == 1) && (!node->skb))
1080 break;
1081
1082 if (node->skb) {
1083 if (node->is_amsdu)
1084 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1085 node->skb);
1086 else
1087 skb_queue_tail(&rxtid->q, node->skb);
1088 node->skb = NULL;
1089 } else {
1090 stats->num_hole++;
1091 }
1092
1093 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1094 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1095 } while (idx != idx_end);
1096
1097 spin_unlock_bh(&rxtid->lock);
1098
1099 stats->num_delivered += skb_queue_len(&rxtid->q);
1100
1101 while ((skb = skb_dequeue(&rxtid->q)))
1102 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1103 }
1104
1105 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1106 u16 seq_no,
1107 bool is_amsdu, struct sk_buff *frame)
1108 {
1109 struct rxtid *rxtid;
1110 struct rxtid_stats *stats;
1111 struct sk_buff *skb;
1112 struct skb_hold_q *node;
1113 u16 idx, st, cur, end;
1114 bool is_queued = false;
1115 u16 extended_end;
1116
1117 rxtid = &agg_conn->rx_tid[tid];
1118 stats = &agg_conn->stat[tid];
1119
1120 stats->num_into_aggr++;
1121
1122 if (!rxtid->aggr) {
1123 if (is_amsdu) {
1124 aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1125 is_queued = true;
1126 stats->num_amsdu++;
1127 while ((skb = skb_dequeue(&rxtid->q)))
1128 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1129 skb);
1130 }
1131 return is_queued;
1132 }
1133
1134 /* Check the incoming sequence no, if it's in the window */
1135 st = rxtid->seq_next;
1136 cur = seq_no;
1137 end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1138
1139 if (((st < end) && (cur < st || cur > end)) ||
1140 ((st > end) && (cur > end) && (cur < st))) {
1141 extended_end = (end + rxtid->hold_q_sz - 1) &
1142 ATH6KL_MAX_SEQ_NO;
1143
1144 if (((end < extended_end) &&
1145 (cur < end || cur > extended_end)) ||
1146 ((end > extended_end) && (cur > extended_end) &&
1147 (cur < end))) {
1148 aggr_deque_frms(agg_conn, tid, 0, 0);
1149 spin_lock_bh(&rxtid->lock);
1150 if (cur >= rxtid->hold_q_sz - 1)
1151 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1152 else
1153 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1154 (rxtid->hold_q_sz - 2 - cur);
1155 spin_unlock_bh(&rxtid->lock);
1156 } else {
1157 /*
1158 * Dequeue only those frames that are outside the
1159 * new shifted window.
1160 */
1161 if (cur >= rxtid->hold_q_sz - 1)
1162 st = cur - (rxtid->hold_q_sz - 1);
1163 else
1164 st = ATH6KL_MAX_SEQ_NO -
1165 (rxtid->hold_q_sz - 2 - cur);
1166
1167 aggr_deque_frms(agg_conn, tid, st, 0);
1168 }
1169
1170 stats->num_oow++;
1171 }
1172
1173 idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1174
1175 node = &rxtid->hold_q[idx];
1176
1177 spin_lock_bh(&rxtid->lock);
1178
1179 /*
1180 * Is the cur frame duplicate or something beyond our window(hold_q
1181 * -> which is 2x, already)?
1182 *
1183 * 1. Duplicate is easy - drop incoming frame.
1184 * 2. Not falling in current sliding window.
1185 * 2a. is the frame_seq_no preceding current tid_seq_no?
1186 * -> drop the frame. perhaps sender did not get our ACK.
1187 * this is taken care of above.
1188 * 2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1189 * -> Taken care of it above, by moving window forward.
1190 */
1191 dev_kfree_skb(node->skb);
1192 stats->num_dups++;
1193
1194 node->skb = frame;
1195 is_queued = true;
1196 node->is_amsdu = is_amsdu;
1197 node->seq_no = seq_no;
1198
1199 if (node->is_amsdu)
1200 stats->num_amsdu++;
1201 else
1202 stats->num_mpdu++;
1203
1204 spin_unlock_bh(&rxtid->lock);
1205
1206 aggr_deque_frms(agg_conn, tid, 0, 1);
1207
1208 if (agg_conn->timer_scheduled)
1209 return is_queued;
1210
1211 spin_lock_bh(&rxtid->lock);
1212 for (idx = 0; idx < rxtid->hold_q_sz; idx++) {
1213 if (rxtid->hold_q[idx].skb) {
1214 /*
1215 * There is a frame in the queue and no
1216 * timer so start a timer to ensure that
1217 * the frame doesn't remain stuck
1218 * forever.
1219 */
1220 agg_conn->timer_scheduled = true;
1221 mod_timer(&agg_conn->timer,
1222 (jiffies + (HZ * AGGR_RX_TIMEOUT) / 1000));
1223 rxtid->timer_mon = true;
1224 break;
1225 }
1226 }
1227 spin_unlock_bh(&rxtid->lock);
1228
1229 return is_queued;
1230 }
1231
1232 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1233 struct ath6kl_sta *conn)
1234 {
1235 struct ath6kl *ar = vif->ar;
1236 bool is_apsdq_empty, is_apsdq_empty_at_start;
1237 u32 num_frames_to_deliver, flags;
1238 struct sk_buff *skb = NULL;
1239
1240 /*
1241 * If the APSD q for this STA is not empty, dequeue and
1242 * send a pkt from the head of the q. Also update the
1243 * More data bit in the WMI_DATA_HDR if there are
1244 * more pkts for this STA in the APSD q.
1245 * If there are no more pkts for this STA,
1246 * update the APSD bitmap for this STA.
1247 */
1248
1249 num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1250 ATH6KL_APSD_FRAME_MASK;
1251 /*
1252 * Number of frames to send in a service period is
1253 * indicated by the station
1254 * in the QOS_INFO of the association request
1255 * If it is zero, send all frames
1256 */
1257 if (!num_frames_to_deliver)
1258 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1259
1260 spin_lock_bh(&conn->psq_lock);
1261 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1262 spin_unlock_bh(&conn->psq_lock);
1263 is_apsdq_empty_at_start = is_apsdq_empty;
1264
1265 while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1266 spin_lock_bh(&conn->psq_lock);
1267 skb = skb_dequeue(&conn->apsdq);
1268 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1269 spin_unlock_bh(&conn->psq_lock);
1270
1271 /*
1272 * Set the STA flag to Trigger delivery,
1273 * so that the frame will go out
1274 */
1275 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1276 num_frames_to_deliver--;
1277
1278 /* Last frame in the service period, set EOSP or queue empty */
1279 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1280 conn->sta_flags |= STA_PS_APSD_EOSP;
1281
1282 ath6kl_data_tx(skb, vif->ndev);
1283 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1284 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1285 }
1286
1287 if (is_apsdq_empty) {
1288 if (is_apsdq_empty_at_start)
1289 flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1290 else
1291 flags = 0;
1292
1293 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1294 vif->fw_vif_idx,
1295 conn->aid, 0, flags);
1296 }
1297
1298 return;
1299 }
1300
1301 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1302 {
1303 struct ath6kl *ar = target->dev->ar;
1304 struct sk_buff *skb = packet->pkt_cntxt;
1305 struct wmi_rx_meta_v2 *meta;
1306 struct wmi_data_hdr *dhdr;
1307 int min_hdr_len;
1308 u8 meta_type, dot11_hdr = 0;
1309 u8 pad_before_data_start;
1310 int status = packet->status;
1311 enum htc_endpoint_id ept = packet->endpoint;
1312 bool is_amsdu, prev_ps, ps_state = false;
1313 bool trig_state = false;
1314 struct ath6kl_sta *conn = NULL;
1315 struct sk_buff *skb1 = NULL;
1316 struct ethhdr *datap = NULL;
1317 struct ath6kl_vif *vif;
1318 struct aggr_info_conn *aggr_conn;
1319 u16 seq_no, offset;
1320 u8 tid, if_idx;
1321
1322 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1323 "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1324 __func__, ar, ept, skb, packet->buf,
1325 packet->act_len, status);
1326
1327 if (status || packet->act_len < HTC_HDR_LENGTH) {
1328 dev_kfree_skb(skb);
1329 return;
1330 }
1331
1332 skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1333 skb_pull(skb, HTC_HDR_LENGTH);
1334
1335 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1336 skb->data, skb->len);
1337
1338 if (ept == ar->ctrl_ep) {
1339 if (test_bit(WMI_ENABLED, &ar->flag)) {
1340 ath6kl_check_wow_status(ar);
1341 ath6kl_wmi_control_rx(ar->wmi, skb);
1342 return;
1343 }
1344 if_idx =
1345 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1346 } else {
1347 if_idx =
1348 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1349 }
1350
1351 vif = ath6kl_get_vif_by_index(ar, if_idx);
1352 if (!vif) {
1353 dev_kfree_skb(skb);
1354 return;
1355 }
1356
1357 /*
1358 * Take lock to protect buffer counts and adaptive power throughput
1359 * state.
1360 */
1361 spin_lock_bh(&vif->if_lock);
1362
1363 vif->ndev->stats.rx_packets++;
1364 vif->ndev->stats.rx_bytes += packet->act_len;
1365
1366 spin_unlock_bh(&vif->if_lock);
1367
1368 skb->dev = vif->ndev;
1369
1370 if (!test_bit(WMI_ENABLED, &ar->flag)) {
1371 if (EPPING_ALIGNMENT_PAD > 0)
1372 skb_pull(skb, EPPING_ALIGNMENT_PAD);
1373 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1374 return;
1375 }
1376
1377 ath6kl_check_wow_status(ar);
1378
1379 min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1380 sizeof(struct ath6kl_llc_snap_hdr);
1381
1382 dhdr = (struct wmi_data_hdr *) skb->data;
1383
1384 /*
1385 * In the case of AP mode we may receive NULL data frames
1386 * that do not have LLC hdr. They are 16 bytes in size.
1387 * Allow these frames in the AP mode.
1388 */
1389 if (vif->nw_type != AP_NETWORK &&
1390 ((packet->act_len < min_hdr_len) ||
1391 (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1392 ath6kl_info("frame len is too short or too long\n");
1393 vif->ndev->stats.rx_errors++;
1394 vif->ndev->stats.rx_length_errors++;
1395 dev_kfree_skb(skb);
1396 return;
1397 }
1398
1399 pad_before_data_start =
1400 (le16_to_cpu(dhdr->info3) >> WMI_DATA_HDR_PAD_BEFORE_DATA_SHIFT)
1401 & WMI_DATA_HDR_PAD_BEFORE_DATA_MASK;
1402
1403 /* Get the Power save state of the STA */
1404 if (vif->nw_type == AP_NETWORK) {
1405 meta_type = wmi_data_hdr_get_meta(dhdr);
1406
1407 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1408 WMI_DATA_HDR_PS_MASK);
1409
1410 offset = sizeof(struct wmi_data_hdr) + pad_before_data_start;
1411 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1412
1413 switch (meta_type) {
1414 case 0:
1415 break;
1416 case WMI_META_VERSION_1:
1417 offset += sizeof(struct wmi_rx_meta_v1);
1418 break;
1419 case WMI_META_VERSION_2:
1420 offset += sizeof(struct wmi_rx_meta_v2);
1421 break;
1422 default:
1423 break;
1424 }
1425
1426 datap = (struct ethhdr *) (skb->data + offset);
1427 conn = ath6kl_find_sta(vif, datap->h_source);
1428
1429 if (!conn) {
1430 dev_kfree_skb(skb);
1431 return;
1432 }
1433
1434 /*
1435 * If there is a change in PS state of the STA,
1436 * take appropriate steps:
1437 *
1438 * 1. If Sleep-->Awake, flush the psq for the STA
1439 * Clear the PVB for the STA.
1440 * 2. If Awake-->Sleep, Starting queueing frames
1441 * the STA.
1442 */
1443 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1444
1445 if (ps_state)
1446 conn->sta_flags |= STA_PS_SLEEP;
1447 else
1448 conn->sta_flags &= ~STA_PS_SLEEP;
1449
1450 /* Accept trigger only when the station is in sleep */
1451 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1452 ath6kl_uapsd_trigger_frame_rx(vif, conn);
1453
1454 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1455 if (!(conn->sta_flags & STA_PS_SLEEP)) {
1456 struct sk_buff *skbuff = NULL;
1457 bool is_apsdq_empty;
1458 struct ath6kl_mgmt_buff *mgmt;
1459 u8 idx;
1460
1461 spin_lock_bh(&conn->psq_lock);
1462 while (conn->mgmt_psq_len > 0) {
1463 mgmt = list_first_entry(
1464 &conn->mgmt_psq,
1465 struct ath6kl_mgmt_buff,
1466 list);
1467 list_del(&mgmt->list);
1468 conn->mgmt_psq_len--;
1469 spin_unlock_bh(&conn->psq_lock);
1470 idx = vif->fw_vif_idx;
1471
1472 ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1473 idx,
1474 mgmt->id,
1475 mgmt->freq,
1476 mgmt->wait,
1477 mgmt->buf,
1478 mgmt->len,
1479 mgmt->no_cck);
1480
1481 kfree(mgmt);
1482 spin_lock_bh(&conn->psq_lock);
1483 }
1484 conn->mgmt_psq_len = 0;
1485 while ((skbuff = skb_dequeue(&conn->psq))) {
1486 spin_unlock_bh(&conn->psq_lock);
1487 ath6kl_data_tx(skbuff, vif->ndev);
1488 spin_lock_bh(&conn->psq_lock);
1489 }
1490
1491 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1492 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1493 spin_unlock_bh(&conn->psq_lock);
1494 ath6kl_data_tx(skbuff, vif->ndev);
1495 spin_lock_bh(&conn->psq_lock);
1496 }
1497 spin_unlock_bh(&conn->psq_lock);
1498
1499 if (!is_apsdq_empty)
1500 ath6kl_wmi_set_apsd_bfrd_traf(
1501 ar->wmi,
1502 vif->fw_vif_idx,
1503 conn->aid, 0, 0);
1504
1505 /* Clear the PVB for this STA */
1506 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1507 conn->aid, 0);
1508 }
1509 }
1510
1511 /* drop NULL data frames here */
1512 if ((packet->act_len < min_hdr_len) ||
1513 (packet->act_len >
1514 WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1515 dev_kfree_skb(skb);
1516 return;
1517 }
1518 }
1519
1520 is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1521 tid = wmi_data_hdr_get_up(dhdr);
1522 seq_no = wmi_data_hdr_get_seqno(dhdr);
1523 meta_type = wmi_data_hdr_get_meta(dhdr);
1524 dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1525
1526 skb_pull(skb, sizeof(struct wmi_data_hdr));
1527
1528 switch (meta_type) {
1529 case WMI_META_VERSION_1:
1530 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1531 break;
1532 case WMI_META_VERSION_2:
1533 meta = (struct wmi_rx_meta_v2 *) skb->data;
1534 if (meta->csum_flags & 0x1) {
1535 skb->ip_summed = CHECKSUM_COMPLETE;
1536 skb->csum = (__force __wsum) meta->csum;
1537 }
1538 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1539 break;
1540 default:
1541 break;
1542 }
1543
1544 skb_pull(skb, pad_before_data_start);
1545
1546 if (dot11_hdr)
1547 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1548 else if (!is_amsdu)
1549 status = ath6kl_wmi_dot3_2_dix(skb);
1550
1551 if (status) {
1552 /*
1553 * Drop frames that could not be processed (lack of
1554 * memory, etc.)
1555 */
1556 dev_kfree_skb(skb);
1557 return;
1558 }
1559
1560 if (!(vif->ndev->flags & IFF_UP)) {
1561 dev_kfree_skb(skb);
1562 return;
1563 }
1564
1565 if (vif->nw_type == AP_NETWORK) {
1566 datap = (struct ethhdr *) skb->data;
1567 if (is_multicast_ether_addr(datap->h_dest))
1568 /*
1569 * Bcast/Mcast frames should be sent to the
1570 * OS stack as well as on the air.
1571 */
1572 skb1 = skb_copy(skb, GFP_ATOMIC);
1573 else {
1574 /*
1575 * Search for a connected STA with dstMac
1576 * as the Mac address. If found send the
1577 * frame to it on the air else send the
1578 * frame up the stack.
1579 */
1580 conn = ath6kl_find_sta(vif, datap->h_dest);
1581
1582 if (conn && ar->intra_bss) {
1583 skb1 = skb;
1584 skb = NULL;
1585 } else if (conn && !ar->intra_bss) {
1586 dev_kfree_skb(skb);
1587 skb = NULL;
1588 }
1589 }
1590 if (skb1)
1591 ath6kl_data_tx(skb1, vif->ndev);
1592
1593 if (skb == NULL) {
1594 /* nothing to deliver up the stack */
1595 return;
1596 }
1597 }
1598
1599 datap = (struct ethhdr *) skb->data;
1600
1601 if (is_unicast_ether_addr(datap->h_dest)) {
1602 if (vif->nw_type == AP_NETWORK) {
1603 conn = ath6kl_find_sta(vif, datap->h_source);
1604 if (!conn)
1605 return;
1606 aggr_conn = conn->aggr_conn;
1607 } else {
1608 aggr_conn = vif->aggr_cntxt->aggr_conn;
1609 }
1610
1611 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1612 is_amsdu, skb)) {
1613 /* aggregation code will handle the skb */
1614 return;
1615 }
1616 } else if (!is_broadcast_ether_addr(datap->h_dest)) {
1617 vif->ndev->stats.multicast++;
1618 }
1619
1620 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1621 }
1622
1623 static void aggr_timeout(struct timer_list *t)
1624 {
1625 u8 i, j;
1626 struct aggr_info_conn *aggr_conn = from_timer(aggr_conn, t, timer);
1627 struct rxtid *rxtid;
1628 struct rxtid_stats *stats;
1629
1630 for (i = 0; i < NUM_OF_TIDS; i++) {
1631 rxtid = &aggr_conn->rx_tid[i];
1632 stats = &aggr_conn->stat[i];
1633
1634 if (!rxtid->aggr || !rxtid->timer_mon)
1635 continue;
1636
1637 stats->num_timeouts++;
1638 ath6kl_dbg(ATH6KL_DBG_AGGR,
1639 "aggr timeout (st %d end %d)\n",
1640 rxtid->seq_next,
1641 ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1642 ATH6KL_MAX_SEQ_NO));
1643 aggr_deque_frms(aggr_conn, i, 0, 0);
1644 }
1645
1646 aggr_conn->timer_scheduled = false;
1647
1648 for (i = 0; i < NUM_OF_TIDS; i++) {
1649 rxtid = &aggr_conn->rx_tid[i];
1650
1651 if (rxtid->aggr && rxtid->hold_q) {
1652 spin_lock_bh(&rxtid->lock);
1653 for (j = 0; j < rxtid->hold_q_sz; j++) {
1654 if (rxtid->hold_q[j].skb) {
1655 aggr_conn->timer_scheduled = true;
1656 rxtid->timer_mon = true;
1657 break;
1658 }
1659 }
1660 spin_unlock_bh(&rxtid->lock);
1661
1662 if (j >= rxtid->hold_q_sz)
1663 rxtid->timer_mon = false;
1664 }
1665 }
1666
1667 if (aggr_conn->timer_scheduled)
1668 mod_timer(&aggr_conn->timer,
1669 jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1670 }
1671
1672 static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid)
1673 {
1674 struct rxtid *rxtid;
1675 struct rxtid_stats *stats;
1676
1677 if (!aggr_conn || tid >= NUM_OF_TIDS)
1678 return;
1679
1680 rxtid = &aggr_conn->rx_tid[tid];
1681 stats = &aggr_conn->stat[tid];
1682
1683 if (rxtid->aggr)
1684 aggr_deque_frms(aggr_conn, tid, 0, 0);
1685
1686 rxtid->aggr = false;
1687 rxtid->timer_mon = false;
1688 rxtid->win_sz = 0;
1689 rxtid->seq_next = 0;
1690 rxtid->hold_q_sz = 0;
1691
1692 kfree(rxtid->hold_q);
1693 rxtid->hold_q = NULL;
1694
1695 memset(stats, 0, sizeof(struct rxtid_stats));
1696 }
1697
1698 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no,
1699 u8 win_sz)
1700 {
1701 struct ath6kl_sta *sta;
1702 struct aggr_info_conn *aggr_conn = NULL;
1703 struct rxtid *rxtid;
1704 u16 hold_q_size;
1705 u8 tid, aid;
1706
1707 if (vif->nw_type == AP_NETWORK) {
1708 aid = ath6kl_get_aid(tid_mux);
1709 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1710 if (sta)
1711 aggr_conn = sta->aggr_conn;
1712 } else {
1713 aggr_conn = vif->aggr_cntxt->aggr_conn;
1714 }
1715
1716 if (!aggr_conn)
1717 return;
1718
1719 tid = ath6kl_get_tid(tid_mux);
1720 if (tid >= NUM_OF_TIDS)
1721 return;
1722
1723 rxtid = &aggr_conn->rx_tid[tid];
1724
1725 if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1726 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1727 __func__, win_sz, tid);
1728
1729 if (rxtid->aggr)
1730 aggr_delete_tid_state(aggr_conn, tid);
1731
1732 rxtid->seq_next = seq_no;
1733 hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1734 rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1735 if (!rxtid->hold_q)
1736 return;
1737
1738 rxtid->win_sz = win_sz;
1739 rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1740 if (!skb_queue_empty(&rxtid->q))
1741 return;
1742
1743 rxtid->aggr = true;
1744 }
1745
1746 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1747 struct aggr_info_conn *aggr_conn)
1748 {
1749 struct rxtid *rxtid;
1750 u8 i;
1751
1752 aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1753 aggr_conn->dev = vif->ndev;
1754 timer_setup(&aggr_conn->timer, aggr_timeout, 0);
1755 aggr_conn->aggr_info = aggr_info;
1756
1757 aggr_conn->timer_scheduled = false;
1758
1759 for (i = 0; i < NUM_OF_TIDS; i++) {
1760 rxtid = &aggr_conn->rx_tid[i];
1761 rxtid->aggr = false;
1762 rxtid->timer_mon = false;
1763 skb_queue_head_init(&rxtid->q);
1764 spin_lock_init(&rxtid->lock);
1765 }
1766 }
1767
1768 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1769 {
1770 struct aggr_info *p_aggr = NULL;
1771
1772 p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1773 if (!p_aggr) {
1774 ath6kl_err("failed to alloc memory for aggr_node\n");
1775 return NULL;
1776 }
1777
1778 p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1779 if (!p_aggr->aggr_conn) {
1780 ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1781 kfree(p_aggr);
1782 return NULL;
1783 }
1784
1785 aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1786
1787 skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1788 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1789
1790 return p_aggr;
1791 }
1792
1793 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1794 {
1795 struct ath6kl_sta *sta;
1796 struct rxtid *rxtid;
1797 struct aggr_info_conn *aggr_conn = NULL;
1798 u8 tid, aid;
1799
1800 if (vif->nw_type == AP_NETWORK) {
1801 aid = ath6kl_get_aid(tid_mux);
1802 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1803 if (sta)
1804 aggr_conn = sta->aggr_conn;
1805 } else {
1806 aggr_conn = vif->aggr_cntxt->aggr_conn;
1807 }
1808
1809 if (!aggr_conn)
1810 return;
1811
1812 tid = ath6kl_get_tid(tid_mux);
1813 if (tid >= NUM_OF_TIDS)
1814 return;
1815
1816 rxtid = &aggr_conn->rx_tid[tid];
1817
1818 if (rxtid->aggr)
1819 aggr_delete_tid_state(aggr_conn, tid);
1820 }
1821
1822 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1823 {
1824 u8 tid;
1825
1826 if (!aggr_conn)
1827 return;
1828
1829 if (aggr_conn->timer_scheduled) {
1830 del_timer(&aggr_conn->timer);
1831 aggr_conn->timer_scheduled = false;
1832 }
1833
1834 for (tid = 0; tid < NUM_OF_TIDS; tid++)
1835 aggr_delete_tid_state(aggr_conn, tid);
1836 }
1837
1838 /* clean up our amsdu buffer list */
1839 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1840 {
1841 struct htc_packet *packet, *tmp_pkt;
1842
1843 spin_lock_bh(&ar->lock);
1844 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1845 spin_unlock_bh(&ar->lock);
1846 return;
1847 }
1848
1849 list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1850 list) {
1851 list_del(&packet->list);
1852 spin_unlock_bh(&ar->lock);
1853 dev_kfree_skb(packet->pkt_cntxt);
1854 spin_lock_bh(&ar->lock);
1855 }
1856
1857 spin_unlock_bh(&ar->lock);
1858 }
1859
1860 void aggr_module_destroy(struct aggr_info *aggr_info)
1861 {
1862 if (!aggr_info)
1863 return;
1864
1865 aggr_reset_state(aggr_info->aggr_conn);
1866 skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1867 kfree(aggr_info->aggr_conn);
1868 kfree(aggr_info);
1869 }
Linux with added FPC-III support