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 #include "core.h"
19 #include "debug.h"
20
21 /*
22 * tid - tid_mux0..tid_mux3
23 * aid - tid_mux4..tid_mux7
24 */
25 #define ATH6KL_TID_MASK 0xf
26 #define ATH6KL_AID_SHIFT 4
27
ath6kl_get_tid(u8 tid_mux)28 static inline u8 ath6kl_get_tid(u8 tid_mux)
29 {
30 return tid_mux & ATH6KL_TID_MASK;
31 }
32
ath6kl_get_aid(u8 tid_mux)33 static inline u8 ath6kl_get_aid(u8 tid_mux)
34 {
35 return tid_mux >> ATH6KL_AID_SHIFT;
36 }
37
ath6kl_ibss_map_epid(struct sk_buff * skb,struct net_device * dev,u32 * map_no)38 static u8 ath6kl_ibss_map_epid(struct sk_buff *skb, struct net_device *dev,
39 u32 *map_no)
40 {
41 struct ath6kl *ar = ath6kl_priv(dev);
42 struct ethhdr *eth_hdr;
43 u32 i, ep_map = -1;
44 u8 *datap;
45
46 *map_no = 0;
47 datap = skb->data;
48 eth_hdr = (struct ethhdr *) (datap + sizeof(struct wmi_data_hdr));
49
50 if (is_multicast_ether_addr(eth_hdr->h_dest))
51 return ENDPOINT_2;
52
53 for (i = 0; i < ar->node_num; i++) {
54 if (memcmp(eth_hdr->h_dest, ar->node_map[i].mac_addr,
55 ETH_ALEN) == 0) {
56 *map_no = i + 1;
57 ar->node_map[i].tx_pend++;
58 return ar->node_map[i].ep_id;
59 }
60
61 if ((ep_map == -1) && !ar->node_map[i].tx_pend)
62 ep_map = i;
63 }
64
65 if (ep_map == -1) {
66 ep_map = ar->node_num;
67 ar->node_num++;
68 if (ar->node_num > MAX_NODE_NUM)
69 return ENDPOINT_UNUSED;
70 }
71
72 memcpy(ar->node_map[ep_map].mac_addr, eth_hdr->h_dest, ETH_ALEN);
73
74 for (i = ENDPOINT_2; i <= ENDPOINT_5; i++) {
75 if (!ar->tx_pending[i]) {
76 ar->node_map[ep_map].ep_id = i;
77 break;
78 }
79
80 /*
81 * No free endpoint is available, start redistribution on
82 * the inuse endpoints.
83 */
84 if (i == ENDPOINT_5) {
85 ar->node_map[ep_map].ep_id = ar->next_ep_id;
86 ar->next_ep_id++;
87 if (ar->next_ep_id > ENDPOINT_5)
88 ar->next_ep_id = ENDPOINT_2;
89 }
90 }
91
92 *map_no = ep_map + 1;
93 ar->node_map[ep_map].tx_pend++;
94
95 return ar->node_map[ep_map].ep_id;
96 }
97
ath6kl_process_uapsdq(struct ath6kl_sta * conn,struct ath6kl_vif * vif,struct sk_buff * skb,u32 * flags)98 static bool ath6kl_process_uapsdq(struct ath6kl_sta *conn,
99 struct ath6kl_vif *vif,
100 struct sk_buff *skb,
101 u32 *flags)
102 {
103 struct ath6kl *ar = vif->ar;
104 bool is_apsdq_empty = false;
105 struct ethhdr *datap = (struct ethhdr *) skb->data;
106 u8 up = 0, traffic_class, *ip_hdr;
107 u16 ether_type;
108 struct ath6kl_llc_snap_hdr *llc_hdr;
109
110 if (conn->sta_flags & STA_PS_APSD_TRIGGER) {
111 /*
112 * This tx is because of a uAPSD trigger, determine
113 * more and EOSP bit. Set EOSP if queue is empty
114 * or sufficient frames are delivered for this trigger.
115 */
116 spin_lock_bh(&conn->psq_lock);
117 if (!skb_queue_empty(&conn->apsdq))
118 *flags |= WMI_DATA_HDR_FLAGS_MORE;
119 else if (conn->sta_flags & STA_PS_APSD_EOSP)
120 *flags |= WMI_DATA_HDR_FLAGS_EOSP;
121 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
122 spin_unlock_bh(&conn->psq_lock);
123 return false;
124 } else if (!conn->apsd_info)
125 return false;
126
127 if (test_bit(WMM_ENABLED, &vif->flags)) {
128 ether_type = be16_to_cpu(datap->h_proto);
129 if (is_ethertype(ether_type)) {
130 /* packet is in DIX format */
131 ip_hdr = (u8 *)(datap + 1);
132 } else {
133 /* packet is in 802.3 format */
134 llc_hdr = (struct ath6kl_llc_snap_hdr *)
135 (datap + 1);
136 ether_type = be16_to_cpu(llc_hdr->eth_type);
137 ip_hdr = (u8 *)(llc_hdr + 1);
138 }
139
140 if (ether_type == IP_ETHERTYPE)
141 up = ath6kl_wmi_determine_user_priority(
142 ip_hdr, 0);
143 }
144
145 traffic_class = ath6kl_wmi_get_traffic_class(up);
146
147 if ((conn->apsd_info & (1 << traffic_class)) == 0)
148 return false;
149
150 /* Queue the frames if the STA is sleeping */
151 spin_lock_bh(&conn->psq_lock);
152 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
153 skb_queue_tail(&conn->apsdq, skb);
154 spin_unlock_bh(&conn->psq_lock);
155
156 /*
157 * If this is the first pkt getting queued
158 * for this STA, update the PVB for this STA
159 */
160 if (is_apsdq_empty) {
161 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
162 vif->fw_vif_idx,
163 conn->aid, 1, 0);
164 }
165 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
166
167 return true;
168 }
169
ath6kl_process_psq(struct ath6kl_sta * conn,struct ath6kl_vif * vif,struct sk_buff * skb,u32 * flags)170 static bool ath6kl_process_psq(struct ath6kl_sta *conn,
171 struct ath6kl_vif *vif,
172 struct sk_buff *skb,
173 u32 *flags)
174 {
175 bool is_psq_empty = false;
176 struct ath6kl *ar = vif->ar;
177
178 if (conn->sta_flags & STA_PS_POLLED) {
179 spin_lock_bh(&conn->psq_lock);
180 if (!skb_queue_empty(&conn->psq))
181 *flags |= WMI_DATA_HDR_FLAGS_MORE;
182 spin_unlock_bh(&conn->psq_lock);
183 return false;
184 }
185
186 /* Queue the frames if the STA is sleeping */
187 spin_lock_bh(&conn->psq_lock);
188 is_psq_empty = skb_queue_empty(&conn->psq);
189 skb_queue_tail(&conn->psq, skb);
190 spin_unlock_bh(&conn->psq_lock);
191
192 /*
193 * If this is the first pkt getting queued
194 * for this STA, update the PVB for this
195 * STA.
196 */
197 if (is_psq_empty)
198 ath6kl_wmi_set_pvb_cmd(ar->wmi,
199 vif->fw_vif_idx,
200 conn->aid, 1);
201 return true;
202 }
203
ath6kl_powersave_ap(struct ath6kl_vif * vif,struct sk_buff * skb,u32 * flags)204 static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb,
205 u32 *flags)
206 {
207 struct ethhdr *datap = (struct ethhdr *) skb->data;
208 struct ath6kl_sta *conn = NULL;
209 bool ps_queued = false;
210 struct ath6kl *ar = vif->ar;
211
212 if (is_multicast_ether_addr(datap->h_dest)) {
213 u8 ctr = 0;
214 bool q_mcast = false;
215
216 for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
217 if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) {
218 q_mcast = true;
219 break;
220 }
221 }
222
223 if (q_mcast) {
224 /*
225 * If this transmit is not because of a Dtim Expiry
226 * q it.
227 */
228 if (!test_bit(DTIM_EXPIRED, &vif->flags)) {
229 bool is_mcastq_empty = false;
230
231 spin_lock_bh(&ar->mcastpsq_lock);
232 is_mcastq_empty =
233 skb_queue_empty(&ar->mcastpsq);
234 skb_queue_tail(&ar->mcastpsq, skb);
235 spin_unlock_bh(&ar->mcastpsq_lock);
236
237 /*
238 * If this is the first Mcast pkt getting
239 * queued indicate to the target to set the
240 * BitmapControl LSB of the TIM IE.
241 */
242 if (is_mcastq_empty)
243 ath6kl_wmi_set_pvb_cmd(ar->wmi,
244 vif->fw_vif_idx,
245 MCAST_AID, 1);
246
247 ps_queued = true;
248 } else {
249 /*
250 * This transmit is because of Dtim expiry.
251 * Determine if MoreData bit has to be set.
252 */
253 spin_lock_bh(&ar->mcastpsq_lock);
254 if (!skb_queue_empty(&ar->mcastpsq))
255 *flags |= WMI_DATA_HDR_FLAGS_MORE;
256 spin_unlock_bh(&ar->mcastpsq_lock);
257 }
258 }
259 } else {
260 conn = ath6kl_find_sta(vif, datap->h_dest);
261 if (!conn) {
262 dev_kfree_skb(skb);
263
264 /* Inform the caller that the skb is consumed */
265 return true;
266 }
267
268 if (conn->sta_flags & STA_PS_SLEEP) {
269 ps_queued = ath6kl_process_uapsdq(conn,
270 vif, skb, flags);
271 if (!(*flags & WMI_DATA_HDR_FLAGS_UAPSD))
272 ps_queued = ath6kl_process_psq(conn,
273 vif, skb, flags);
274 }
275 }
276 return ps_queued;
277 }
278
279 /* Tx functions */
280
ath6kl_control_tx(void * devt,struct sk_buff * skb,enum htc_endpoint_id eid)281 int ath6kl_control_tx(void *devt, struct sk_buff *skb,
282 enum htc_endpoint_id eid)
283 {
284 struct ath6kl *ar = devt;
285 int status = 0;
286 struct ath6kl_cookie *cookie = NULL;
287
288 if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW))
289 return -EACCES;
290
291 spin_lock_bh(&ar->lock);
292
293 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
294 "%s: skb=0x%p, len=0x%x eid =%d\n", __func__,
295 skb, skb->len, eid);
296
297 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) {
298 /*
299 * Control endpoint is full, don't allocate resources, we
300 * are just going to drop this packet.
301 */
302 cookie = NULL;
303 ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n",
304 skb, skb->len);
305 } else
306 cookie = ath6kl_alloc_cookie(ar);
307
308 if (cookie == NULL) {
309 spin_unlock_bh(&ar->lock);
310 status = -ENOMEM;
311 goto fail_ctrl_tx;
312 }
313
314 ar->tx_pending[eid]++;
315
316 if (eid != ar->ctrl_ep)
317 ar->total_tx_data_pend++;
318
319 spin_unlock_bh(&ar->lock);
320
321 cookie->skb = skb;
322 cookie->map_no = 0;
323 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
324 eid, ATH6KL_CONTROL_PKT_TAG);
325
326 /*
327 * This interface is asynchronous, if there is an error, cleanup
328 * will happen in the TX completion callback.
329 */
330 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
331
332 return 0;
333
334 fail_ctrl_tx:
335 dev_kfree_skb(skb);
336 return status;
337 }
338
ath6kl_data_tx(struct sk_buff * skb,struct net_device * dev)339 int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
340 {
341 struct ath6kl *ar = ath6kl_priv(dev);
342 struct ath6kl_cookie *cookie = NULL;
343 enum htc_endpoint_id eid = ENDPOINT_UNUSED;
344 struct ath6kl_vif *vif = netdev_priv(dev);
345 u32 map_no = 0;
346 u16 htc_tag = ATH6KL_DATA_PKT_TAG;
347 u8 ac = 99 ; /* initialize to unmapped ac */
348 bool chk_adhoc_ps_mapping = false;
349 int ret;
350 struct wmi_tx_meta_v2 meta_v2;
351 void *meta;
352 u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed;
353 u8 meta_ver = 0;
354 u32 flags = 0;
355
356 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
357 "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
358 skb, skb->data, skb->len);
359
360 /* If target is not associated */
361 if (!test_bit(CONNECTED, &vif->flags)) {
362 dev_kfree_skb(skb);
363 return 0;
364 }
365
366 if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON)) {
367 dev_kfree_skb(skb);
368 return 0;
369 }
370
371 if (!test_bit(WMI_READY, &ar->flag))
372 goto fail_tx;
373
374 /* AP mode Power saving processing */
375 if (vif->nw_type == AP_NETWORK) {
376 if (ath6kl_powersave_ap(vif, skb, &flags))
377 return 0;
378 }
379
380 if (test_bit(WMI_ENABLED, &ar->flag)) {
381 if ((dev->features & NETIF_F_IP_CSUM) &&
382 (csum == CHECKSUM_PARTIAL)) {
383 csum_start = skb->csum_start -
384 (skb_network_header(skb) - skb->head) +
385 sizeof(struct ath6kl_llc_snap_hdr);
386 csum_dest = skb->csum_offset + csum_start;
387 }
388
389 if (skb_headroom(skb) < dev->needed_headroom) {
390 struct sk_buff *tmp_skb = skb;
391
392 skb = skb_realloc_headroom(skb, dev->needed_headroom);
393 kfree_skb(tmp_skb);
394 if (skb == NULL) {
395 vif->net_stats.tx_dropped++;
396 return 0;
397 }
398 }
399
400 if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) {
401 ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n");
402 goto fail_tx;
403 }
404
405 if ((dev->features & NETIF_F_IP_CSUM) &&
406 (csum == CHECKSUM_PARTIAL)) {
407 meta_v2.csum_start = csum_start;
408 meta_v2.csum_dest = csum_dest;
409
410 /* instruct target to calculate checksum */
411 meta_v2.csum_flags = WMI_META_V2_FLAG_CSUM_OFFLOAD;
412 meta_ver = WMI_META_VERSION_2;
413 meta = &meta_v2;
414 } else {
415 meta_ver = 0;
416 meta = NULL;
417 }
418
419 ret = ath6kl_wmi_data_hdr_add(ar->wmi, skb,
420 DATA_MSGTYPE, flags, 0,
421 meta_ver,
422 meta, vif->fw_vif_idx);
423
424 if (ret) {
425 ath6kl_warn("failed to add wmi data header:%d\n"
426 , ret);
427 goto fail_tx;
428 }
429
430 if ((vif->nw_type == ADHOC_NETWORK) &&
431 ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags))
432 chk_adhoc_ps_mapping = true;
433 else {
434 /* get the stream mapping */
435 ret = ath6kl_wmi_implicit_create_pstream(ar->wmi,
436 vif->fw_vif_idx, skb,
437 0, test_bit(WMM_ENABLED, &vif->flags), &ac);
438 if (ret)
439 goto fail_tx;
440 }
441 } else
442 goto fail_tx;
443
444 spin_lock_bh(&ar->lock);
445
446 if (chk_adhoc_ps_mapping)
447 eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
448 else
449 eid = ar->ac2ep_map[ac];
450
451 if (eid == 0 || eid == ENDPOINT_UNUSED) {
452 ath6kl_err("eid %d is not mapped!\n", eid);
453 spin_unlock_bh(&ar->lock);
454 goto fail_tx;
455 }
456
457 /* allocate resource for this packet */
458 cookie = ath6kl_alloc_cookie(ar);
459
460 if (!cookie) {
461 spin_unlock_bh(&ar->lock);
462 goto fail_tx;
463 }
464
465 /* update counts while the lock is held */
466 ar->tx_pending[eid]++;
467 ar->total_tx_data_pend++;
468
469 spin_unlock_bh(&ar->lock);
470
471 if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
472 skb_cloned(skb)) {
473 /*
474 * We will touch (move the buffer data to align it. Since the
475 * skb buffer is cloned and not only the header is changed, we
476 * have to copy it to allow the changes. Since we are copying
477 * the data here, we may as well align it by reserving suitable
478 * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
479 */
480 struct sk_buff *nskb;
481
482 nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
483 if (nskb == NULL)
484 goto fail_tx;
485 kfree_skb(skb);
486 skb = nskb;
487 }
488
489 cookie->skb = skb;
490 cookie->map_no = map_no;
491 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
492 eid, htc_tag);
493
494 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
495 skb->data, skb->len);
496
497 /*
498 * HTC interface is asynchronous, if this fails, cleanup will
499 * happen in the ath6kl_tx_complete callback.
500 */
501 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
502
503 return 0;
504
505 fail_tx:
506 dev_kfree_skb(skb);
507
508 vif->net_stats.tx_dropped++;
509 vif->net_stats.tx_aborted_errors++;
510
511 return 0;
512 }
513
514 /* indicate tx activity or inactivity on a WMI stream */
ath6kl_indicate_tx_activity(void * devt,u8 traffic_class,bool active)515 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
516 {
517 struct ath6kl *ar = devt;
518 enum htc_endpoint_id eid;
519 int i;
520
521 eid = ar->ac2ep_map[traffic_class];
522
523 if (!test_bit(WMI_ENABLED, &ar->flag))
524 goto notify_htc;
525
526 spin_lock_bh(&ar->lock);
527
528 ar->ac_stream_active[traffic_class] = active;
529
530 if (active) {
531 /*
532 * Keep track of the active stream with the highest
533 * priority.
534 */
535 if (ar->ac_stream_pri_map[traffic_class] >
536 ar->hiac_stream_active_pri)
537 /* set the new highest active priority */
538 ar->hiac_stream_active_pri =
539 ar->ac_stream_pri_map[traffic_class];
540
541 } else {
542 /*
543 * We may have to search for the next active stream
544 * that is the highest priority.
545 */
546 if (ar->hiac_stream_active_pri ==
547 ar->ac_stream_pri_map[traffic_class]) {
548 /*
549 * The highest priority stream just went inactive
550 * reset and search for the "next" highest "active"
551 * priority stream.
552 */
553 ar->hiac_stream_active_pri = 0;
554
555 for (i = 0; i < WMM_NUM_AC; i++) {
556 if (ar->ac_stream_active[i] &&
557 (ar->ac_stream_pri_map[i] >
558 ar->hiac_stream_active_pri))
559 /*
560 * Set the new highest active
561 * priority.
562 */
563 ar->hiac_stream_active_pri =
564 ar->ac_stream_pri_map[i];
565 }
566 }
567 }
568
569 spin_unlock_bh(&ar->lock);
570
571 notify_htc:
572 /* notify HTC, this may cause credit distribution changes */
573 ath6kl_htc_indicate_activity_change(ar->htc_target, eid, active);
574 }
575
ath6kl_tx_queue_full(struct htc_target * target,struct htc_packet * packet)576 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
577 struct htc_packet *packet)
578 {
579 struct ath6kl *ar = target->dev->ar;
580 struct ath6kl_vif *vif;
581 enum htc_endpoint_id endpoint = packet->endpoint;
582 enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
583
584 if (endpoint == ar->ctrl_ep) {
585 /*
586 * Under normal WMI if this is getting full, then something
587 * is running rampant the host should not be exhausting the
588 * WMI queue with too many commands the only exception to
589 * this is during testing using endpointping.
590 */
591 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
592 ath6kl_err("wmi ctrl ep is full\n");
593 return action;
594 }
595
596 if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
597 return action;
598
599 /*
600 * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
601 * the highest active stream.
602 */
603 if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
604 ar->hiac_stream_active_pri &&
605 ar->cookie_count <=
606 target->endpoint[endpoint].tx_drop_packet_threshold)
607 /*
608 * Give preference to the highest priority stream by
609 * dropping the packets which overflowed.
610 */
611 action = HTC_SEND_FULL_DROP;
612
613 /* FIXME: Locking */
614 spin_lock_bh(&ar->list_lock);
615 list_for_each_entry(vif, &ar->vif_list, list) {
616 if (vif->nw_type == ADHOC_NETWORK ||
617 action != HTC_SEND_FULL_DROP) {
618 spin_unlock_bh(&ar->list_lock);
619
620 set_bit(NETQ_STOPPED, &vif->flags);
621 netif_stop_queue(vif->ndev);
622
623 return action;
624 }
625 }
626 spin_unlock_bh(&ar->list_lock);
627
628 return action;
629 }
630
631 /* TODO this needs to be looked at */
ath6kl_tx_clear_node_map(struct ath6kl_vif * vif,enum htc_endpoint_id eid,u32 map_no)632 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
633 enum htc_endpoint_id eid, u32 map_no)
634 {
635 struct ath6kl *ar = vif->ar;
636 u32 i;
637
638 if (vif->nw_type != ADHOC_NETWORK)
639 return;
640
641 if (!ar->ibss_ps_enable)
642 return;
643
644 if (eid == ar->ctrl_ep)
645 return;
646
647 if (map_no == 0)
648 return;
649
650 map_no--;
651 ar->node_map[map_no].tx_pend--;
652
653 if (ar->node_map[map_no].tx_pend)
654 return;
655
656 if (map_no != (ar->node_num - 1))
657 return;
658
659 for (i = ar->node_num; i > 0; i--) {
660 if (ar->node_map[i - 1].tx_pend)
661 break;
662
663 memset(&ar->node_map[i - 1], 0,
664 sizeof(struct ath6kl_node_mapping));
665 ar->node_num--;
666 }
667 }
668
ath6kl_tx_complete(void * context,struct list_head * packet_queue)669 void ath6kl_tx_complete(void *context, struct list_head *packet_queue)
670 {
671 struct ath6kl *ar = context;
672 struct sk_buff_head skb_queue;
673 struct htc_packet *packet;
674 struct sk_buff *skb;
675 struct ath6kl_cookie *ath6kl_cookie;
676 u32 map_no = 0;
677 int status;
678 enum htc_endpoint_id eid;
679 bool wake_event = false;
680 bool flushing[ATH6KL_VIF_MAX] = {false};
681 u8 if_idx;
682 struct ath6kl_vif *vif;
683
684 skb_queue_head_init(&skb_queue);
685
686 /* lock the driver as we update internal state */
687 spin_lock_bh(&ar->lock);
688
689 /* reap completed packets */
690 while (!list_empty(packet_queue)) {
691
692 packet = list_first_entry(packet_queue, struct htc_packet,
693 list);
694 list_del(&packet->list);
695
696 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
697 if (!ath6kl_cookie)
698 goto fatal;
699
700 status = packet->status;
701 skb = ath6kl_cookie->skb;
702 eid = packet->endpoint;
703 map_no = ath6kl_cookie->map_no;
704
705 if (!skb || !skb->data)
706 goto fatal;
707
708 __skb_queue_tail(&skb_queue, skb);
709
710 if (!status && (packet->act_len != skb->len))
711 goto fatal;
712
713 ar->tx_pending[eid]--;
714
715 if (eid != ar->ctrl_ep)
716 ar->total_tx_data_pend--;
717
718 if (eid == ar->ctrl_ep) {
719 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
720 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
721
722 if (ar->tx_pending[eid] == 0)
723 wake_event = true;
724 }
725
726 if (eid == ar->ctrl_ep) {
727 if_idx = wmi_cmd_hdr_get_if_idx(
728 (struct wmi_cmd_hdr *) packet->buf);
729 } else {
730 if_idx = wmi_data_hdr_get_if_idx(
731 (struct wmi_data_hdr *) packet->buf);
732 }
733
734 vif = ath6kl_get_vif_by_index(ar, if_idx);
735 if (!vif) {
736 ath6kl_free_cookie(ar, ath6kl_cookie);
737 continue;
738 }
739
740 if (status) {
741 if (status == -ECANCELED)
742 /* a packet was flushed */
743 flushing[if_idx] = true;
744
745 vif->net_stats.tx_errors++;
746
747 if (status != -ENOSPC && status != -ECANCELED)
748 ath6kl_warn("tx complete error: %d\n", status);
749
750 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
751 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
752 __func__, skb, packet->buf, packet->act_len,
753 eid, "error!");
754 } else {
755 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
756 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
757 __func__, skb, packet->buf, packet->act_len,
758 eid, "OK");
759
760 flushing[if_idx] = false;
761 vif->net_stats.tx_packets++;
762 vif->net_stats.tx_bytes += skb->len;
763 }
764
765 ath6kl_tx_clear_node_map(vif, eid, map_no);
766
767 ath6kl_free_cookie(ar, ath6kl_cookie);
768
769 if (test_bit(NETQ_STOPPED, &vif->flags))
770 clear_bit(NETQ_STOPPED, &vif->flags);
771 }
772
773 spin_unlock_bh(&ar->lock);
774
775 __skb_queue_purge(&skb_queue);
776
777 /* FIXME: Locking */
778 spin_lock_bh(&ar->list_lock);
779 list_for_each_entry(vif, &ar->vif_list, list) {
780 if (test_bit(CONNECTED, &vif->flags) &&
781 !flushing[vif->fw_vif_idx]) {
782 spin_unlock_bh(&ar->list_lock);
783 netif_wake_queue(vif->ndev);
784 spin_lock_bh(&ar->list_lock);
785 }
786 }
787 spin_unlock_bh(&ar->list_lock);
788
789 if (wake_event)
790 wake_up(&ar->event_wq);
791
792 return;
793
794 fatal:
795 WARN_ON(1);
796 spin_unlock_bh(&ar->lock);
797 return;
798 }
799
ath6kl_tx_data_cleanup(struct ath6kl * ar)800 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
801 {
802 int i;
803
804 /* flush all the data (non-control) streams */
805 for (i = 0; i < WMM_NUM_AC; i++)
806 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
807 ATH6KL_DATA_PKT_TAG);
808 }
809
810 /* Rx functions */
811
ath6kl_deliver_frames_to_nw_stack(struct net_device * dev,struct sk_buff * skb)812 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
813 struct sk_buff *skb)
814 {
815 if (!skb)
816 return;
817
818 skb->dev = dev;
819
820 if (!(skb->dev->flags & IFF_UP)) {
821 dev_kfree_skb(skb);
822 return;
823 }
824
825 skb->protocol = eth_type_trans(skb, skb->dev);
826
827 netif_rx_ni(skb);
828 }
829
ath6kl_alloc_netbufs(struct sk_buff_head * q,u16 num)830 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
831 {
832 struct sk_buff *skb;
833
834 while (num) {
835 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
836 if (!skb) {
837 ath6kl_err("netbuf allocation failed\n");
838 return;
839 }
840 skb_queue_tail(q, skb);
841 num--;
842 }
843 }
844
aggr_get_free_skb(struct aggr_info * p_aggr)845 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
846 {
847 struct sk_buff *skb = NULL;
848
849 if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
850 (AGGR_NUM_OF_FREE_NETBUFS >> 2))
851 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
852 AGGR_NUM_OF_FREE_NETBUFS);
853
854 skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
855
856 return skb;
857 }
858
ath6kl_rx_refill(struct htc_target * target,enum htc_endpoint_id endpoint)859 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
860 {
861 struct ath6kl *ar = target->dev->ar;
862 struct sk_buff *skb;
863 int rx_buf;
864 int n_buf_refill;
865 struct htc_packet *packet;
866 struct list_head queue;
867
868 n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
869 ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
870
871 if (n_buf_refill <= 0)
872 return;
873
874 INIT_LIST_HEAD(&queue);
875
876 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
877 "%s: providing htc with %d buffers at eid=%d\n",
878 __func__, n_buf_refill, endpoint);
879
880 for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
881 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
882 if (!skb)
883 break;
884
885 packet = (struct htc_packet *) skb->head;
886 if (!IS_ALIGNED((unsigned long) skb->data, 4))
887 skb->data = PTR_ALIGN(skb->data - 4, 4);
888 set_htc_rxpkt_info(packet, skb, skb->data,
889 ATH6KL_BUFFER_SIZE, endpoint);
890 list_add_tail(&packet->list, &queue);
891 }
892
893 if (!list_empty(&queue))
894 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
895 }
896
ath6kl_refill_amsdu_rxbufs(struct ath6kl * ar,int count)897 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
898 {
899 struct htc_packet *packet;
900 struct sk_buff *skb;
901
902 while (count) {
903 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
904 if (!skb)
905 return;
906
907 packet = (struct htc_packet *) skb->head;
908 if (!IS_ALIGNED((unsigned long) skb->data, 4))
909 skb->data = PTR_ALIGN(skb->data - 4, 4);
910 set_htc_rxpkt_info(packet, skb, skb->data,
911 ATH6KL_AMSDU_BUFFER_SIZE, 0);
912 spin_lock_bh(&ar->lock);
913 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
914 spin_unlock_bh(&ar->lock);
915 count--;
916 }
917 }
918
919 /*
920 * Callback to allocate a receive buffer for a pending packet. We use a
921 * pre-allocated list of buffers of maximum AMSDU size (4K).
922 */
ath6kl_alloc_amsdu_rxbuf(struct htc_target * target,enum htc_endpoint_id endpoint,int len)923 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
924 enum htc_endpoint_id endpoint,
925 int len)
926 {
927 struct ath6kl *ar = target->dev->ar;
928 struct htc_packet *packet = NULL;
929 struct list_head *pkt_pos;
930 int refill_cnt = 0, depth = 0;
931
932 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
933 __func__, endpoint, len);
934
935 if ((len <= ATH6KL_BUFFER_SIZE) ||
936 (len > ATH6KL_AMSDU_BUFFER_SIZE))
937 return NULL;
938
939 spin_lock_bh(&ar->lock);
940
941 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
942 spin_unlock_bh(&ar->lock);
943 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
944 goto refill_buf;
945 }
946
947 packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
948 struct htc_packet, list);
949 list_del(&packet->list);
950 list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
951 depth++;
952
953 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
954 spin_unlock_bh(&ar->lock);
955
956 /* set actual endpoint ID */
957 packet->endpoint = endpoint;
958
959 refill_buf:
960 if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
961 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
962
963 return packet;
964 }
965
aggr_slice_amsdu(struct aggr_info * p_aggr,struct rxtid * rxtid,struct sk_buff * skb)966 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
967 struct rxtid *rxtid, struct sk_buff *skb)
968 {
969 struct sk_buff *new_skb;
970 struct ethhdr *hdr;
971 u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
972 u8 *framep;
973
974 mac_hdr_len = sizeof(struct ethhdr);
975 framep = skb->data + mac_hdr_len;
976 amsdu_len = skb->len - mac_hdr_len;
977
978 while (amsdu_len > mac_hdr_len) {
979 hdr = (struct ethhdr *) framep;
980 payload_8023_len = ntohs(hdr->h_proto);
981
982 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
983 payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
984 ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
985 payload_8023_len);
986 break;
987 }
988
989 frame_8023_len = payload_8023_len + mac_hdr_len;
990 new_skb = aggr_get_free_skb(p_aggr);
991 if (!new_skb) {
992 ath6kl_err("no buffer available\n");
993 break;
994 }
995
996 memcpy(new_skb->data, framep, frame_8023_len);
997 skb_put(new_skb, frame_8023_len);
998 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
999 ath6kl_err("dot3_2_dix error\n");
1000 dev_kfree_skb(new_skb);
1001 break;
1002 }
1003
1004 skb_queue_tail(&rxtid->q, new_skb);
1005
1006 /* Is this the last subframe within this aggregate ? */
1007 if ((amsdu_len - frame_8023_len) == 0)
1008 break;
1009
1010 /* Add the length of A-MSDU subframe padding bytes -
1011 * Round to nearest word.
1012 */
1013 frame_8023_len = ALIGN(frame_8023_len, 4);
1014
1015 framep += frame_8023_len;
1016 amsdu_len -= frame_8023_len;
1017 }
1018
1019 dev_kfree_skb(skb);
1020 }
1021
aggr_deque_frms(struct aggr_info_conn * agg_conn,u8 tid,u16 seq_no,u8 order)1022 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1023 u16 seq_no, u8 order)
1024 {
1025 struct sk_buff *skb;
1026 struct rxtid *rxtid;
1027 struct skb_hold_q *node;
1028 u16 idx, idx_end, seq_end;
1029 struct rxtid_stats *stats;
1030
1031 rxtid = &agg_conn->rx_tid[tid];
1032 stats = &agg_conn->stat[tid];
1033
1034 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1035
1036 /*
1037 * idx_end is typically the last possible frame in the window,
1038 * but changes to 'the' seq_no, when BAR comes. If seq_no
1039 * is non-zero, we will go up to that and stop.
1040 * Note: last seq no in current window will occupy the same
1041 * index position as index that is just previous to start.
1042 * An imp point : if win_sz is 7, for seq_no space of 4095,
1043 * then, there would be holes when sequence wrap around occurs.
1044 * Target should judiciously choose the win_sz, based on
1045 * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1046 * 2, 4, 8, 16 win_sz works fine).
1047 * We must deque from "idx" to "idx_end", including both.
1048 */
1049 seq_end = seq_no ? seq_no : rxtid->seq_next;
1050 idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1051
1052 spin_lock_bh(&rxtid->lock);
1053
1054 do {
1055 node = &rxtid->hold_q[idx];
1056 if ((order == 1) && (!node->skb))
1057 break;
1058
1059 if (node->skb) {
1060 if (node->is_amsdu)
1061 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1062 node->skb);
1063 else
1064 skb_queue_tail(&rxtid->q, node->skb);
1065 node->skb = NULL;
1066 } else
1067 stats->num_hole++;
1068
1069 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1070 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1071 } while (idx != idx_end);
1072
1073 spin_unlock_bh(&rxtid->lock);
1074
1075 stats->num_delivered += skb_queue_len(&rxtid->q);
1076
1077 while ((skb = skb_dequeue(&rxtid->q)))
1078 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1079 }
1080
aggr_process_recv_frm(struct aggr_info_conn * agg_conn,u8 tid,u16 seq_no,bool is_amsdu,struct sk_buff * frame)1081 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1082 u16 seq_no,
1083 bool is_amsdu, struct sk_buff *frame)
1084 {
1085 struct rxtid *rxtid;
1086 struct rxtid_stats *stats;
1087 struct sk_buff *skb;
1088 struct skb_hold_q *node;
1089 u16 idx, st, cur, end;
1090 bool is_queued = false;
1091 u16 extended_end;
1092
1093 rxtid = &agg_conn->rx_tid[tid];
1094 stats = &agg_conn->stat[tid];
1095
1096 stats->num_into_aggr++;
1097
1098 if (!rxtid->aggr) {
1099 if (is_amsdu) {
1100 aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1101 is_queued = true;
1102 stats->num_amsdu++;
1103 while ((skb = skb_dequeue(&rxtid->q)))
1104 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1105 skb);
1106 }
1107 return is_queued;
1108 }
1109
1110 /* Check the incoming sequence no, if it's in the window */
1111 st = rxtid->seq_next;
1112 cur = seq_no;
1113 end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1114
1115 if (((st < end) && (cur < st || cur > end)) ||
1116 ((st > end) && (cur > end) && (cur < st))) {
1117 extended_end = (end + rxtid->hold_q_sz - 1) &
1118 ATH6KL_MAX_SEQ_NO;
1119
1120 if (((end < extended_end) &&
1121 (cur < end || cur > extended_end)) ||
1122 ((end > extended_end) && (cur > extended_end) &&
1123 (cur < end))) {
1124 aggr_deque_frms(agg_conn, tid, 0, 0);
1125 if (cur >= rxtid->hold_q_sz - 1)
1126 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1127 else
1128 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1129 (rxtid->hold_q_sz - 2 - cur);
1130 } else {
1131 /*
1132 * Dequeue only those frames that are outside the
1133 * new shifted window.
1134 */
1135 if (cur >= rxtid->hold_q_sz - 1)
1136 st = cur - (rxtid->hold_q_sz - 1);
1137 else
1138 st = ATH6KL_MAX_SEQ_NO -
1139 (rxtid->hold_q_sz - 2 - cur);
1140
1141 aggr_deque_frms(agg_conn, tid, st, 0);
1142 }
1143
1144 stats->num_oow++;
1145 }
1146
1147 idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1148
1149 node = &rxtid->hold_q[idx];
1150
1151 spin_lock_bh(&rxtid->lock);
1152
1153 /*
1154 * Is the cur frame duplicate or something beyond our window(hold_q
1155 * -> which is 2x, already)?
1156 *
1157 * 1. Duplicate is easy - drop incoming frame.
1158 * 2. Not falling in current sliding window.
1159 * 2a. is the frame_seq_no preceding current tid_seq_no?
1160 * -> drop the frame. perhaps sender did not get our ACK.
1161 * this is taken care of above.
1162 * 2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1163 * -> Taken care of it above, by moving window forward.
1164 */
1165 dev_kfree_skb(node->skb);
1166 stats->num_dups++;
1167
1168 node->skb = frame;
1169 is_queued = true;
1170 node->is_amsdu = is_amsdu;
1171 node->seq_no = seq_no;
1172
1173 if (node->is_amsdu)
1174 stats->num_amsdu++;
1175 else
1176 stats->num_mpdu++;
1177
1178 spin_unlock_bh(&rxtid->lock);
1179
1180 aggr_deque_frms(agg_conn, tid, 0, 1);
1181
1182 if (agg_conn->timer_scheduled)
1183 rxtid->progress = true;
1184 else
1185 for (idx = 0 ; idx < rxtid->hold_q_sz; idx++) {
1186 if (rxtid->hold_q[idx].skb) {
1187 /*
1188 * There is a frame in the queue and no
1189 * timer so start a timer to ensure that
1190 * the frame doesn't remain stuck
1191 * forever.
1192 */
1193 agg_conn->timer_scheduled = true;
1194 mod_timer(&agg_conn->timer,
1195 (jiffies +
1196 HZ * (AGGR_RX_TIMEOUT) / 1000));
1197 rxtid->progress = false;
1198 rxtid->timer_mon = true;
1199 break;
1200 }
1201 }
1202
1203 return is_queued;
1204 }
1205
ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif * vif,struct ath6kl_sta * conn)1206 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1207 struct ath6kl_sta *conn)
1208 {
1209 struct ath6kl *ar = vif->ar;
1210 bool is_apsdq_empty, is_apsdq_empty_at_start;
1211 u32 num_frames_to_deliver, flags;
1212 struct sk_buff *skb = NULL;
1213
1214 /*
1215 * If the APSD q for this STA is not empty, dequeue and
1216 * send a pkt from the head of the q. Also update the
1217 * More data bit in the WMI_DATA_HDR if there are
1218 * more pkts for this STA in the APSD q.
1219 * If there are no more pkts for this STA,
1220 * update the APSD bitmap for this STA.
1221 */
1222
1223 num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1224 ATH6KL_APSD_FRAME_MASK;
1225 /*
1226 * Number of frames to send in a service period is
1227 * indicated by the station
1228 * in the QOS_INFO of the association request
1229 * If it is zero, send all frames
1230 */
1231 if (!num_frames_to_deliver)
1232 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1233
1234 spin_lock_bh(&conn->psq_lock);
1235 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1236 spin_unlock_bh(&conn->psq_lock);
1237 is_apsdq_empty_at_start = is_apsdq_empty;
1238
1239 while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1240
1241 spin_lock_bh(&conn->psq_lock);
1242 skb = skb_dequeue(&conn->apsdq);
1243 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1244 spin_unlock_bh(&conn->psq_lock);
1245
1246 /*
1247 * Set the STA flag to Trigger delivery,
1248 * so that the frame will go out
1249 */
1250 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1251 num_frames_to_deliver--;
1252
1253 /* Last frame in the service period, set EOSP or queue empty */
1254 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1255 conn->sta_flags |= STA_PS_APSD_EOSP;
1256
1257 ath6kl_data_tx(skb, vif->ndev);
1258 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1259 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1260 }
1261
1262 if (is_apsdq_empty) {
1263 if (is_apsdq_empty_at_start)
1264 flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1265 else
1266 flags = 0;
1267
1268 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1269 vif->fw_vif_idx,
1270 conn->aid, 0, flags);
1271 }
1272
1273 return;
1274 }
1275
ath6kl_rx(struct htc_target * target,struct htc_packet * packet)1276 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1277 {
1278 struct ath6kl *ar = target->dev->ar;
1279 struct sk_buff *skb = packet->pkt_cntxt;
1280 struct wmi_rx_meta_v2 *meta;
1281 struct wmi_data_hdr *dhdr;
1282 int min_hdr_len;
1283 u8 meta_type, dot11_hdr = 0;
1284 int status = packet->status;
1285 enum htc_endpoint_id ept = packet->endpoint;
1286 bool is_amsdu, prev_ps, ps_state = false;
1287 bool trig_state = false;
1288 struct ath6kl_sta *conn = NULL;
1289 struct sk_buff *skb1 = NULL;
1290 struct ethhdr *datap = NULL;
1291 struct ath6kl_vif *vif;
1292 struct aggr_info_conn *aggr_conn;
1293 u16 seq_no, offset;
1294 u8 tid, if_idx;
1295
1296 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1297 "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1298 __func__, ar, ept, skb, packet->buf,
1299 packet->act_len, status);
1300
1301 if (status || !(skb->data + HTC_HDR_LENGTH)) {
1302 dev_kfree_skb(skb);
1303 return;
1304 }
1305
1306 skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1307 skb_pull(skb, HTC_HDR_LENGTH);
1308
1309 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1310 skb->data, skb->len);
1311
1312 if (ept == ar->ctrl_ep) {
1313 if (test_bit(WMI_ENABLED, &ar->flag)) {
1314 ath6kl_check_wow_status(ar);
1315 ath6kl_wmi_control_rx(ar->wmi, skb);
1316 return;
1317 }
1318 if_idx =
1319 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1320 } else {
1321 if_idx =
1322 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1323 }
1324
1325 vif = ath6kl_get_vif_by_index(ar, if_idx);
1326 if (!vif) {
1327 dev_kfree_skb(skb);
1328 return;
1329 }
1330
1331 /*
1332 * Take lock to protect buffer counts and adaptive power throughput
1333 * state.
1334 */
1335 spin_lock_bh(&vif->if_lock);
1336
1337 vif->net_stats.rx_packets++;
1338 vif->net_stats.rx_bytes += packet->act_len;
1339
1340 spin_unlock_bh(&vif->if_lock);
1341
1342 skb->dev = vif->ndev;
1343
1344 if (!test_bit(WMI_ENABLED, &ar->flag)) {
1345 if (EPPING_ALIGNMENT_PAD > 0)
1346 skb_pull(skb, EPPING_ALIGNMENT_PAD);
1347 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1348 return;
1349 }
1350
1351 ath6kl_check_wow_status(ar);
1352
1353 min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1354 sizeof(struct ath6kl_llc_snap_hdr);
1355
1356 dhdr = (struct wmi_data_hdr *) skb->data;
1357
1358 /*
1359 * In the case of AP mode we may receive NULL data frames
1360 * that do not have LLC hdr. They are 16 bytes in size.
1361 * Allow these frames in the AP mode.
1362 */
1363 if (vif->nw_type != AP_NETWORK &&
1364 ((packet->act_len < min_hdr_len) ||
1365 (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1366 ath6kl_info("frame len is too short or too long\n");
1367 vif->net_stats.rx_errors++;
1368 vif->net_stats.rx_length_errors++;
1369 dev_kfree_skb(skb);
1370 return;
1371 }
1372
1373 /* Get the Power save state of the STA */
1374 if (vif->nw_type == AP_NETWORK) {
1375 meta_type = wmi_data_hdr_get_meta(dhdr);
1376
1377 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1378 WMI_DATA_HDR_PS_MASK);
1379
1380 offset = sizeof(struct wmi_data_hdr);
1381 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1382
1383 switch (meta_type) {
1384 case 0:
1385 break;
1386 case WMI_META_VERSION_1:
1387 offset += sizeof(struct wmi_rx_meta_v1);
1388 break;
1389 case WMI_META_VERSION_2:
1390 offset += sizeof(struct wmi_rx_meta_v2);
1391 break;
1392 default:
1393 break;
1394 }
1395
1396 datap = (struct ethhdr *) (skb->data + offset);
1397 conn = ath6kl_find_sta(vif, datap->h_source);
1398
1399 if (!conn) {
1400 dev_kfree_skb(skb);
1401 return;
1402 }
1403
1404 /*
1405 * If there is a change in PS state of the STA,
1406 * take appropriate steps:
1407 *
1408 * 1. If Sleep-->Awake, flush the psq for the STA
1409 * Clear the PVB for the STA.
1410 * 2. If Awake-->Sleep, Starting queueing frames
1411 * the STA.
1412 */
1413 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1414
1415 if (ps_state)
1416 conn->sta_flags |= STA_PS_SLEEP;
1417 else
1418 conn->sta_flags &= ~STA_PS_SLEEP;
1419
1420 /* Accept trigger only when the station is in sleep */
1421 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1422 ath6kl_uapsd_trigger_frame_rx(vif, conn);
1423
1424 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1425 if (!(conn->sta_flags & STA_PS_SLEEP)) {
1426 struct sk_buff *skbuff = NULL;
1427 bool is_apsdq_empty;
1428 struct ath6kl_mgmt_buff *mgmt;
1429 u8 idx;
1430
1431 spin_lock_bh(&conn->psq_lock);
1432 while (conn->mgmt_psq_len > 0) {
1433 mgmt = list_first_entry(
1434 &conn->mgmt_psq,
1435 struct ath6kl_mgmt_buff,
1436 list);
1437 list_del(&mgmt->list);
1438 conn->mgmt_psq_len--;
1439 spin_unlock_bh(&conn->psq_lock);
1440 idx = vif->fw_vif_idx;
1441
1442 ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1443 idx,
1444 mgmt->id,
1445 mgmt->freq,
1446 mgmt->wait,
1447 mgmt->buf,
1448 mgmt->len,
1449 mgmt->no_cck);
1450
1451 kfree(mgmt);
1452 spin_lock_bh(&conn->psq_lock);
1453 }
1454 conn->mgmt_psq_len = 0;
1455 while ((skbuff = skb_dequeue(&conn->psq))) {
1456 spin_unlock_bh(&conn->psq_lock);
1457 ath6kl_data_tx(skbuff, vif->ndev);
1458 spin_lock_bh(&conn->psq_lock);
1459 }
1460
1461 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1462 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1463 spin_unlock_bh(&conn->psq_lock);
1464 ath6kl_data_tx(skbuff, vif->ndev);
1465 spin_lock_bh(&conn->psq_lock);
1466 }
1467 spin_unlock_bh(&conn->psq_lock);
1468
1469 if (!is_apsdq_empty)
1470 ath6kl_wmi_set_apsd_bfrd_traf(
1471 ar->wmi,
1472 vif->fw_vif_idx,
1473 conn->aid, 0, 0);
1474
1475 /* Clear the PVB for this STA */
1476 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1477 conn->aid, 0);
1478 }
1479 }
1480
1481 /* drop NULL data frames here */
1482 if ((packet->act_len < min_hdr_len) ||
1483 (packet->act_len >
1484 WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1485 dev_kfree_skb(skb);
1486 return;
1487 }
1488 }
1489
1490 is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1491 tid = wmi_data_hdr_get_up(dhdr);
1492 seq_no = wmi_data_hdr_get_seqno(dhdr);
1493 meta_type = wmi_data_hdr_get_meta(dhdr);
1494 dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1495 skb_pull(skb, sizeof(struct wmi_data_hdr));
1496
1497 switch (meta_type) {
1498 case WMI_META_VERSION_1:
1499 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1500 break;
1501 case WMI_META_VERSION_2:
1502 meta = (struct wmi_rx_meta_v2 *) skb->data;
1503 if (meta->csum_flags & 0x1) {
1504 skb->ip_summed = CHECKSUM_COMPLETE;
1505 skb->csum = (__force __wsum) meta->csum;
1506 }
1507 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1508 break;
1509 default:
1510 break;
1511 }
1512
1513 if (dot11_hdr)
1514 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1515 else if (!is_amsdu)
1516 status = ath6kl_wmi_dot3_2_dix(skb);
1517
1518 if (status) {
1519 /*
1520 * Drop frames that could not be processed (lack of
1521 * memory, etc.)
1522 */
1523 dev_kfree_skb(skb);
1524 return;
1525 }
1526
1527 if (!(vif->ndev->flags & IFF_UP)) {
1528 dev_kfree_skb(skb);
1529 return;
1530 }
1531
1532 if (vif->nw_type == AP_NETWORK) {
1533 datap = (struct ethhdr *) skb->data;
1534 if (is_multicast_ether_addr(datap->h_dest))
1535 /*
1536 * Bcast/Mcast frames should be sent to the
1537 * OS stack as well as on the air.
1538 */
1539 skb1 = skb_copy(skb, GFP_ATOMIC);
1540 else {
1541 /*
1542 * Search for a connected STA with dstMac
1543 * as the Mac address. If found send the
1544 * frame to it on the air else send the
1545 * frame up the stack.
1546 */
1547 conn = ath6kl_find_sta(vif, datap->h_dest);
1548
1549 if (conn && ar->intra_bss) {
1550 skb1 = skb;
1551 skb = NULL;
1552 } else if (conn && !ar->intra_bss) {
1553 dev_kfree_skb(skb);
1554 skb = NULL;
1555 }
1556 }
1557 if (skb1)
1558 ath6kl_data_tx(skb1, vif->ndev);
1559
1560 if (skb == NULL) {
1561 /* nothing to deliver up the stack */
1562 return;
1563 }
1564 }
1565
1566 datap = (struct ethhdr *) skb->data;
1567
1568 if (is_unicast_ether_addr(datap->h_dest)) {
1569 if (vif->nw_type == AP_NETWORK) {
1570 conn = ath6kl_find_sta(vif, datap->h_source);
1571 if (!conn)
1572 return;
1573 aggr_conn = conn->aggr_conn;
1574 } else
1575 aggr_conn = vif->aggr_cntxt->aggr_conn;
1576
1577 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1578 is_amsdu, skb)) {
1579 /* aggregation code will handle the skb */
1580 return;
1581 }
1582 }
1583
1584 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1585 }
1586
aggr_timeout(unsigned long arg)1587 static void aggr_timeout(unsigned long arg)
1588 {
1589 u8 i, j;
1590 struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg;
1591 struct rxtid *rxtid;
1592 struct rxtid_stats *stats;
1593
1594 for (i = 0; i < NUM_OF_TIDS; i++) {
1595 rxtid = &aggr_conn->rx_tid[i];
1596 stats = &aggr_conn->stat[i];
1597
1598 if (!rxtid->aggr || !rxtid->timer_mon || rxtid->progress)
1599 continue;
1600
1601 stats->num_timeouts++;
1602 ath6kl_dbg(ATH6KL_DBG_AGGR,
1603 "aggr timeout (st %d end %d)\n",
1604 rxtid->seq_next,
1605 ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1606 ATH6KL_MAX_SEQ_NO));
1607 aggr_deque_frms(aggr_conn, i, 0, 0);
1608 }
1609
1610 aggr_conn->timer_scheduled = false;
1611
1612 for (i = 0; i < NUM_OF_TIDS; i++) {
1613 rxtid = &aggr_conn->rx_tid[i];
1614
1615 if (rxtid->aggr && rxtid->hold_q) {
1616 for (j = 0; j < rxtid->hold_q_sz; j++) {
1617 if (rxtid->hold_q[j].skb) {
1618 aggr_conn->timer_scheduled = true;
1619 rxtid->timer_mon = true;
1620 rxtid->progress = false;
1621 break;
1622 }
1623 }
1624
1625 if (j >= rxtid->hold_q_sz)
1626 rxtid->timer_mon = false;
1627 }
1628 }
1629
1630 if (aggr_conn->timer_scheduled)
1631 mod_timer(&aggr_conn->timer,
1632 jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1633 }
1634
aggr_delete_tid_state(struct aggr_info_conn * aggr_conn,u8 tid)1635 static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid)
1636 {
1637 struct rxtid *rxtid;
1638 struct rxtid_stats *stats;
1639
1640 if (!aggr_conn || tid >= NUM_OF_TIDS)
1641 return;
1642
1643 rxtid = &aggr_conn->rx_tid[tid];
1644 stats = &aggr_conn->stat[tid];
1645
1646 if (rxtid->aggr)
1647 aggr_deque_frms(aggr_conn, tid, 0, 0);
1648
1649 rxtid->aggr = false;
1650 rxtid->progress = false;
1651 rxtid->timer_mon = false;
1652 rxtid->win_sz = 0;
1653 rxtid->seq_next = 0;
1654 rxtid->hold_q_sz = 0;
1655
1656 kfree(rxtid->hold_q);
1657 rxtid->hold_q = NULL;
1658
1659 memset(stats, 0, sizeof(struct rxtid_stats));
1660 }
1661
aggr_recv_addba_req_evt(struct ath6kl_vif * vif,u8 tid_mux,u16 seq_no,u8 win_sz)1662 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no,
1663 u8 win_sz)
1664 {
1665 struct ath6kl_sta *sta;
1666 struct aggr_info_conn *aggr_conn = NULL;
1667 struct rxtid *rxtid;
1668 struct rxtid_stats *stats;
1669 u16 hold_q_size;
1670 u8 tid, aid;
1671
1672 if (vif->nw_type == AP_NETWORK) {
1673 aid = ath6kl_get_aid(tid_mux);
1674 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1675 if (sta)
1676 aggr_conn = sta->aggr_conn;
1677 } else
1678 aggr_conn = vif->aggr_cntxt->aggr_conn;
1679
1680 if (!aggr_conn)
1681 return;
1682
1683 tid = ath6kl_get_tid(tid_mux);
1684 if (tid >= NUM_OF_TIDS)
1685 return;
1686
1687 rxtid = &aggr_conn->rx_tid[tid];
1688 stats = &aggr_conn->stat[tid];
1689
1690 if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1691 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1692 __func__, win_sz, tid);
1693
1694 if (rxtid->aggr)
1695 aggr_delete_tid_state(aggr_conn, tid);
1696
1697 rxtid->seq_next = seq_no;
1698 hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1699 rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1700 if (!rxtid->hold_q)
1701 return;
1702
1703 rxtid->win_sz = win_sz;
1704 rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1705 if (!skb_queue_empty(&rxtid->q))
1706 return;
1707
1708 rxtid->aggr = true;
1709 }
1710
aggr_conn_init(struct ath6kl_vif * vif,struct aggr_info * aggr_info,struct aggr_info_conn * aggr_conn)1711 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1712 struct aggr_info_conn *aggr_conn)
1713 {
1714 struct rxtid *rxtid;
1715 u8 i;
1716
1717 aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1718 aggr_conn->dev = vif->ndev;
1719 init_timer(&aggr_conn->timer);
1720 aggr_conn->timer.function = aggr_timeout;
1721 aggr_conn->timer.data = (unsigned long) aggr_conn;
1722 aggr_conn->aggr_info = aggr_info;
1723
1724 aggr_conn->timer_scheduled = false;
1725
1726 for (i = 0; i < NUM_OF_TIDS; i++) {
1727 rxtid = &aggr_conn->rx_tid[i];
1728 rxtid->aggr = false;
1729 rxtid->progress = false;
1730 rxtid->timer_mon = false;
1731 skb_queue_head_init(&rxtid->q);
1732 spin_lock_init(&rxtid->lock);
1733 }
1734
1735 }
1736
aggr_init(struct ath6kl_vif * vif)1737 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1738 {
1739 struct aggr_info *p_aggr = NULL;
1740
1741 p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1742 if (!p_aggr) {
1743 ath6kl_err("failed to alloc memory for aggr_node\n");
1744 return NULL;
1745 }
1746
1747 p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1748 if (!p_aggr->aggr_conn) {
1749 ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1750 kfree(p_aggr);
1751 return NULL;
1752 }
1753
1754 aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1755
1756 skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1757 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1758
1759 return p_aggr;
1760 }
1761
aggr_recv_delba_req_evt(struct ath6kl_vif * vif,u8 tid_mux)1762 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1763 {
1764 struct ath6kl_sta *sta;
1765 struct rxtid *rxtid;
1766 struct aggr_info_conn *aggr_conn = NULL;
1767 u8 tid, aid;
1768
1769 if (vif->nw_type == AP_NETWORK) {
1770 aid = ath6kl_get_aid(tid_mux);
1771 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1772 if (sta)
1773 aggr_conn = sta->aggr_conn;
1774 } else
1775 aggr_conn = vif->aggr_cntxt->aggr_conn;
1776
1777 if (!aggr_conn)
1778 return;
1779
1780 tid = ath6kl_get_tid(tid_mux);
1781 if (tid >= NUM_OF_TIDS)
1782 return;
1783
1784 rxtid = &aggr_conn->rx_tid[tid];
1785
1786 if (rxtid->aggr)
1787 aggr_delete_tid_state(aggr_conn, tid);
1788 }
1789
aggr_reset_state(struct aggr_info_conn * aggr_conn)1790 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1791 {
1792 u8 tid;
1793
1794 if (!aggr_conn)
1795 return;
1796
1797 if (aggr_conn->timer_scheduled) {
1798 del_timer(&aggr_conn->timer);
1799 aggr_conn->timer_scheduled = false;
1800 }
1801
1802 for (tid = 0; tid < NUM_OF_TIDS; tid++)
1803 aggr_delete_tid_state(aggr_conn, tid);
1804 }
1805
1806 /* clean up our amsdu buffer list */
ath6kl_cleanup_amsdu_rxbufs(struct ath6kl * ar)1807 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1808 {
1809 struct htc_packet *packet, *tmp_pkt;
1810
1811 spin_lock_bh(&ar->lock);
1812 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1813 spin_unlock_bh(&ar->lock);
1814 return;
1815 }
1816
1817 list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1818 list) {
1819 list_del(&packet->list);
1820 spin_unlock_bh(&ar->lock);
1821 dev_kfree_skb(packet->pkt_cntxt);
1822 spin_lock_bh(&ar->lock);
1823 }
1824
1825 spin_unlock_bh(&ar->lock);
1826 }
1827
aggr_module_destroy(struct aggr_info * aggr_info)1828 void aggr_module_destroy(struct aggr_info *aggr_info)
1829 {
1830 if (!aggr_info)
1831 return;
1832
1833 aggr_reset_state(aggr_info->aggr_conn);
1834 skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1835 kfree(aggr_info->aggr_conn);
1836 kfree(aggr_info);
1837 }
1838