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ARM: mm: Recreate kernel mappings in early_paging_init()
[linux/fpc-iii.git] / drivers / net / wireless / ath / ath6kl / txrx.c
blobebb24045a8ae6cbcac844a239d11a05ee6f86e14
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 if (test_bit(WMM_ENABLED, &vif->flags)) {
132 ether_type = be16_to_cpu(datap->h_proto);
133 if (is_ethertype(ether_type)) {
134 /* packet is in DIX format */
135 ip_hdr = (u8 *)(datap + 1);
136 } else {
137 /* packet is in 802.3 format */
138 llc_hdr = (struct ath6kl_llc_snap_hdr *)
139 (datap + 1);
140 ether_type = be16_to_cpu(llc_hdr->eth_type);
141 ip_hdr = (u8 *)(llc_hdr + 1);
142 }
143
144 if (ether_type == IP_ETHERTYPE)
145 up = ath6kl_wmi_determine_user_priority(
146 ip_hdr, 0);
147 }
148
149 traffic_class = ath6kl_wmi_get_traffic_class(up);
150
151 if ((conn->apsd_info & (1 << traffic_class)) == 0)
152 return false;
153
154 /* Queue the frames if the STA is sleeping */
155 spin_lock_bh(&conn->psq_lock);
156 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
157 skb_queue_tail(&conn->apsdq, skb);
158 spin_unlock_bh(&conn->psq_lock);
159
160 /*
161 * If this is the first pkt getting queued
162 * for this STA, update the PVB for this STA
163 */
164 if (is_apsdq_empty) {
165 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
166 vif->fw_vif_idx,
167 conn->aid, 1, 0);
168 }
169 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
170
171 return true;
172 }
173
174 static bool ath6kl_process_psq(struct ath6kl_sta *conn,
175 struct ath6kl_vif *vif,
176 struct sk_buff *skb,
177 u32 *flags)
178 {
179 bool is_psq_empty = false;
180 struct ath6kl *ar = vif->ar;
181
182 if (conn->sta_flags & STA_PS_POLLED) {
183 spin_lock_bh(&conn->psq_lock);
184 if (!skb_queue_empty(&conn->psq))
185 *flags |= WMI_DATA_HDR_FLAGS_MORE;
186 spin_unlock_bh(&conn->psq_lock);
187 return false;
188 }
189
190 /* Queue the frames if the STA is sleeping */
191 spin_lock_bh(&conn->psq_lock);
192 is_psq_empty = skb_queue_empty(&conn->psq);
193 skb_queue_tail(&conn->psq, skb);
194 spin_unlock_bh(&conn->psq_lock);
195
196 /*
197 * If this is the first pkt getting queued
198 * for this STA, update the PVB for this
199 * STA.
200 */
201 if (is_psq_empty)
202 ath6kl_wmi_set_pvb_cmd(ar->wmi,
203 vif->fw_vif_idx,
204 conn->aid, 1);
205 return true;
206 }
207
208 static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb,
209 u32 *flags)
210 {
211 struct ethhdr *datap = (struct ethhdr *) skb->data;
212 struct ath6kl_sta *conn = NULL;
213 bool ps_queued = false;
214 struct ath6kl *ar = vif->ar;
215
216 if (is_multicast_ether_addr(datap->h_dest)) {
217 u8 ctr = 0;
218 bool q_mcast = false;
219
220 for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
221 if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) {
222 q_mcast = true;
223 break;
224 }
225 }
226
227 if (q_mcast) {
228 /*
229 * If this transmit is not because of a Dtim Expiry
230 * q it.
231 */
232 if (!test_bit(DTIM_EXPIRED, &vif->flags)) {
233 bool is_mcastq_empty = false;
234
235 spin_lock_bh(&ar->mcastpsq_lock);
236 is_mcastq_empty =
237 skb_queue_empty(&ar->mcastpsq);
238 skb_queue_tail(&ar->mcastpsq, skb);
239 spin_unlock_bh(&ar->mcastpsq_lock);
240
241 /*
242 * If this is the first Mcast pkt getting
243 * queued indicate to the target to set the
244 * BitmapControl LSB of the TIM IE.
245 */
246 if (is_mcastq_empty)
247 ath6kl_wmi_set_pvb_cmd(ar->wmi,
248 vif->fw_vif_idx,
249 MCAST_AID, 1);
250
251 ps_queued = true;
252 } else {
253 /*
254 * This transmit is because of Dtim expiry.
255 * Determine if MoreData bit has to be set.
256 */
257 spin_lock_bh(&ar->mcastpsq_lock);
258 if (!skb_queue_empty(&ar->mcastpsq))
259 *flags |= WMI_DATA_HDR_FLAGS_MORE;
260 spin_unlock_bh(&ar->mcastpsq_lock);
261 }
262 }
263 } else {
264 conn = ath6kl_find_sta(vif, datap->h_dest);
265 if (!conn) {
266 dev_kfree_skb(skb);
267
268 /* Inform the caller that the skb is consumed */
269 return true;
270 }
271
272 if (conn->sta_flags & STA_PS_SLEEP) {
273 ps_queued = ath6kl_process_uapsdq(conn,
274 vif, skb, flags);
275 if (!(*flags & WMI_DATA_HDR_FLAGS_UAPSD))
276 ps_queued = ath6kl_process_psq(conn,
277 vif, skb, flags);
278 }
279 }
280 return ps_queued;
281 }
282
283 /* Tx functions */
284
285 int ath6kl_control_tx(void *devt, struct sk_buff *skb,
286 enum htc_endpoint_id eid)
287 {
288 struct ath6kl *ar = devt;
289 int status = 0;
290 struct ath6kl_cookie *cookie = NULL;
291
292 trace_ath6kl_wmi_cmd(skb->data, skb->len);
293
294 if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW)) {
295 dev_kfree_skb(skb);
296 return -EACCES;
297 }
298
299 if (WARN_ON_ONCE(eid == ENDPOINT_UNUSED ||
300 eid >= ENDPOINT_MAX)) {
301 status = -EINVAL;
302 goto fail_ctrl_tx;
303 }
304
305 spin_lock_bh(&ar->lock);
306
307 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
308 "%s: skb=0x%p, len=0x%x eid =%d\n", __func__,
309 skb, skb->len, eid);
310
311 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) {
312 /*
313 * Control endpoint is full, don't allocate resources, we
314 * are just going to drop this packet.
315 */
316 cookie = NULL;
317 ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n",
318 skb, skb->len);
319 } else
320 cookie = ath6kl_alloc_cookie(ar);
321
322 if (cookie == NULL) {
323 spin_unlock_bh(&ar->lock);
324 status = -ENOMEM;
325 goto fail_ctrl_tx;
326 }
327
328 ar->tx_pending[eid]++;
329
330 if (eid != ar->ctrl_ep)
331 ar->total_tx_data_pend++;
332
333 spin_unlock_bh(&ar->lock);
334
335 cookie->skb = skb;
336 cookie->map_no = 0;
337 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
338 eid, ATH6KL_CONTROL_PKT_TAG);
339 cookie->htc_pkt.skb = skb;
340
341 /*
342 * This interface is asynchronous, if there is an error, cleanup
343 * will happen in the TX completion callback.
344 */
345 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
346
347 return 0;
348
349 fail_ctrl_tx:
350 dev_kfree_skb(skb);
351 return status;
352 }
353
354 int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
355 {
356 struct ath6kl *ar = ath6kl_priv(dev);
357 struct ath6kl_cookie *cookie = NULL;
358 enum htc_endpoint_id eid = ENDPOINT_UNUSED;
359 struct ath6kl_vif *vif = netdev_priv(dev);
360 u32 map_no = 0;
361 u16 htc_tag = ATH6KL_DATA_PKT_TAG;
362 u8 ac = 99 ; /* initialize to unmapped ac */
363 bool chk_adhoc_ps_mapping = false;
364 int ret;
365 struct wmi_tx_meta_v2 meta_v2;
366 void *meta;
367 u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed;
368 u8 meta_ver = 0;
369 u32 flags = 0;
370
371 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
372 "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
373 skb, skb->data, skb->len);
374
375 /* If target is not associated */
376 if (!test_bit(CONNECTED, &vif->flags))
377 goto fail_tx;
378
379 if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON))
380 goto fail_tx;
381
382 if (!test_bit(WMI_READY, &ar->flag))
383 goto fail_tx;
384
385 /* AP mode Power saving processing */
386 if (vif->nw_type == AP_NETWORK) {
387 if (ath6kl_powersave_ap(vif, skb, &flags))
388 return 0;
389 }
390
391 if (test_bit(WMI_ENABLED, &ar->flag)) {
392 if ((dev->features & NETIF_F_IP_CSUM) &&
393 (csum == CHECKSUM_PARTIAL)) {
394 csum_start = skb->csum_start -
395 (skb_network_header(skb) - skb->head) +
396 sizeof(struct ath6kl_llc_snap_hdr);
397 csum_dest = skb->csum_offset + csum_start;
398 }
399
400 if (skb_headroom(skb) < dev->needed_headroom) {
401 struct sk_buff *tmp_skb = skb;
402
403 skb = skb_realloc_headroom(skb, dev->needed_headroom);
404 kfree_skb(tmp_skb);
405 if (skb == NULL) {
406 vif->net_stats.tx_dropped++;
407 return 0;
408 }
409 }
410
411 if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) {
412 ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n");
413 goto fail_tx;
414 }
415
416 if ((dev->features & NETIF_F_IP_CSUM) &&
417 (csum == CHECKSUM_PARTIAL)) {
418 meta_v2.csum_start = csum_start;
419 meta_v2.csum_dest = csum_dest;
420
421 /* instruct target to calculate checksum */
422 meta_v2.csum_flags = WMI_META_V2_FLAG_CSUM_OFFLOAD;
423 meta_ver = WMI_META_VERSION_2;
424 meta = &meta_v2;
425 } else {
426 meta_ver = 0;
427 meta = NULL;
428 }
429
430 ret = ath6kl_wmi_data_hdr_add(ar->wmi, skb,
431 DATA_MSGTYPE, flags, 0,
432 meta_ver,
433 meta, vif->fw_vif_idx);
434
435 if (ret) {
436 ath6kl_warn("failed to add wmi data header:%d\n"
437 , ret);
438 goto fail_tx;
439 }
440
441 if ((vif->nw_type == ADHOC_NETWORK) &&
442 ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags))
443 chk_adhoc_ps_mapping = true;
444 else {
445 /* get the stream mapping */
446 ret = ath6kl_wmi_implicit_create_pstream(ar->wmi,
447 vif->fw_vif_idx, skb,
448 0, test_bit(WMM_ENABLED, &vif->flags), &ac);
449 if (ret)
450 goto fail_tx;
451 }
452 } else
453 goto fail_tx;
454
455 spin_lock_bh(&ar->lock);
456
457 if (chk_adhoc_ps_mapping)
458 eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
459 else
460 eid = ar->ac2ep_map[ac];
461
462 if (eid == 0 || eid == ENDPOINT_UNUSED) {
463 ath6kl_err("eid %d is not mapped!\n", eid);
464 spin_unlock_bh(&ar->lock);
465 goto fail_tx;
466 }
467
468 /* allocate resource for this packet */
469 cookie = ath6kl_alloc_cookie(ar);
470
471 if (!cookie) {
472 spin_unlock_bh(&ar->lock);
473 goto fail_tx;
474 }
475
476 /* update counts while the lock is held */
477 ar->tx_pending[eid]++;
478 ar->total_tx_data_pend++;
479
480 spin_unlock_bh(&ar->lock);
481
482 if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
483 skb_cloned(skb)) {
484 /*
485 * We will touch (move the buffer data to align it. Since the
486 * skb buffer is cloned and not only the header is changed, we
487 * have to copy it to allow the changes. Since we are copying
488 * the data here, we may as well align it by reserving suitable
489 * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
490 */
491 struct sk_buff *nskb;
492
493 nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
494 if (nskb == NULL)
495 goto fail_tx;
496 kfree_skb(skb);
497 skb = nskb;
498 }
499
500 cookie->skb = skb;
501 cookie->map_no = map_no;
502 set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
503 eid, htc_tag);
504 cookie->htc_pkt.skb = skb;
505
506 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
507 skb->data, skb->len);
508
509 /*
510 * HTC interface is asynchronous, if this fails, cleanup will
511 * happen in the ath6kl_tx_complete callback.
512 */
513 ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
514
515 return 0;
516
517 fail_tx:
518 dev_kfree_skb(skb);
519
520 vif->net_stats.tx_dropped++;
521 vif->net_stats.tx_aborted_errors++;
522
523 return 0;
524 }
525
526 /* indicate tx activity or inactivity on a WMI stream */
527 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
528 {
529 struct ath6kl *ar = devt;
530 enum htc_endpoint_id eid;
531 int i;
532
533 eid = ar->ac2ep_map[traffic_class];
534
535 if (!test_bit(WMI_ENABLED, &ar->flag))
536 goto notify_htc;
537
538 spin_lock_bh(&ar->lock);
539
540 ar->ac_stream_active[traffic_class] = active;
541
542 if (active) {
543 /*
544 * Keep track of the active stream with the highest
545 * priority.
546 */
547 if (ar->ac_stream_pri_map[traffic_class] >
548 ar->hiac_stream_active_pri)
549 /* set the new highest active priority */
550 ar->hiac_stream_active_pri =
551 ar->ac_stream_pri_map[traffic_class];
552
553 } else {
554 /*
555 * We may have to search for the next active stream
556 * that is the highest priority.
557 */
558 if (ar->hiac_stream_active_pri ==
559 ar->ac_stream_pri_map[traffic_class]) {
560 /*
561 * The highest priority stream just went inactive
562 * reset and search for the "next" highest "active"
563 * priority stream.
564 */
565 ar->hiac_stream_active_pri = 0;
566
567 for (i = 0; i < WMM_NUM_AC; i++) {
568 if (ar->ac_stream_active[i] &&
569 (ar->ac_stream_pri_map[i] >
570 ar->hiac_stream_active_pri))
571 /*
572 * Set the new highest active
573 * priority.
574 */
575 ar->hiac_stream_active_pri =
576 ar->ac_stream_pri_map[i];
577 }
578 }
579 }
580
581 spin_unlock_bh(&ar->lock);
582
583 notify_htc:
584 /* notify HTC, this may cause credit distribution changes */
585 ath6kl_htc_activity_changed(ar->htc_target, eid, active);
586 }
587
588 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
589 struct htc_packet *packet)
590 {
591 struct ath6kl *ar = target->dev->ar;
592 struct ath6kl_vif *vif;
593 enum htc_endpoint_id endpoint = packet->endpoint;
594 enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
595
596 if (endpoint == ar->ctrl_ep) {
597 /*
598 * Under normal WMI if this is getting full, then something
599 * is running rampant the host should not be exhausting the
600 * WMI queue with too many commands the only exception to
601 * this is during testing using endpointping.
602 */
603 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
604 ath6kl_err("wmi ctrl ep is full\n");
605 ath6kl_recovery_err_notify(ar, ATH6KL_FW_EP_FULL);
606 return action;
607 }
608
609 if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
610 return action;
611
612 /*
613 * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
614 * the highest active stream.
615 */
616 if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
617 ar->hiac_stream_active_pri &&
618 ar->cookie_count <=
619 target->endpoint[endpoint].tx_drop_packet_threshold)
620 /*
621 * Give preference to the highest priority stream by
622 * dropping the packets which overflowed.
623 */
624 action = HTC_SEND_FULL_DROP;
625
626 /* FIXME: Locking */
627 spin_lock_bh(&ar->list_lock);
628 list_for_each_entry(vif, &ar->vif_list, list) {
629 if (vif->nw_type == ADHOC_NETWORK ||
630 action != HTC_SEND_FULL_DROP) {
631 spin_unlock_bh(&ar->list_lock);
632
633 set_bit(NETQ_STOPPED, &vif->flags);
634 netif_stop_queue(vif->ndev);
635
636 return action;
637 }
638 }
639 spin_unlock_bh(&ar->list_lock);
640
641 return action;
642 }
643
644 /* TODO this needs to be looked at */
645 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
646 enum htc_endpoint_id eid, u32 map_no)
647 {
648 struct ath6kl *ar = vif->ar;
649 u32 i;
650
651 if (vif->nw_type != ADHOC_NETWORK)
652 return;
653
654 if (!ar->ibss_ps_enable)
655 return;
656
657 if (eid == ar->ctrl_ep)
658 return;
659
660 if (map_no == 0)
661 return;
662
663 map_no--;
664 ar->node_map[map_no].tx_pend--;
665
666 if (ar->node_map[map_no].tx_pend)
667 return;
668
669 if (map_no != (ar->node_num - 1))
670 return;
671
672 for (i = ar->node_num; i > 0; i--) {
673 if (ar->node_map[i - 1].tx_pend)
674 break;
675
676 memset(&ar->node_map[i - 1], 0,
677 sizeof(struct ath6kl_node_mapping));
678 ar->node_num--;
679 }
680 }
681
682 void ath6kl_tx_complete(struct htc_target *target,
683 struct list_head *packet_queue)
684 {
685 struct ath6kl *ar = target->dev->ar;
686 struct sk_buff_head skb_queue;
687 struct htc_packet *packet;
688 struct sk_buff *skb;
689 struct ath6kl_cookie *ath6kl_cookie;
690 u32 map_no = 0;
691 int status;
692 enum htc_endpoint_id eid;
693 bool wake_event = false;
694 bool flushing[ATH6KL_VIF_MAX] = {false};
695 u8 if_idx;
696 struct ath6kl_vif *vif;
697
698 skb_queue_head_init(&skb_queue);
699
700 /* lock the driver as we update internal state */
701 spin_lock_bh(&ar->lock);
702
703 /* reap completed packets */
704 while (!list_empty(packet_queue)) {
705
706 packet = list_first_entry(packet_queue, struct htc_packet,
707 list);
708 list_del(&packet->list);
709
710 if (WARN_ON_ONCE(packet->endpoint == ENDPOINT_UNUSED ||
711 packet->endpoint >= ENDPOINT_MAX))
712 continue;
713
714 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
715 if (WARN_ON_ONCE(!ath6kl_cookie))
716 continue;
717
718 status = packet->status;
719 skb = ath6kl_cookie->skb;
720 eid = packet->endpoint;
721 map_no = ath6kl_cookie->map_no;
722
723 if (WARN_ON_ONCE(!skb || !skb->data)) {
724 dev_kfree_skb(skb);
725 ath6kl_free_cookie(ar, ath6kl_cookie);
726 continue;
727 }
728
729 __skb_queue_tail(&skb_queue, skb);
730
731 if (WARN_ON_ONCE(!status && (packet->act_len != skb->len))) {
732 ath6kl_free_cookie(ar, ath6kl_cookie);
733 continue;
734 }
735
736 ar->tx_pending[eid]--;
737
738 if (eid != ar->ctrl_ep)
739 ar->total_tx_data_pend--;
740
741 if (eid == ar->ctrl_ep) {
742 if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
743 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
744
745 if (ar->tx_pending[eid] == 0)
746 wake_event = true;
747 }
748
749 if (eid == ar->ctrl_ep) {
750 if_idx = wmi_cmd_hdr_get_if_idx(
751 (struct wmi_cmd_hdr *) packet->buf);
752 } else {
753 if_idx = wmi_data_hdr_get_if_idx(
754 (struct wmi_data_hdr *) packet->buf);
755 }
756
757 vif = ath6kl_get_vif_by_index(ar, if_idx);
758 if (!vif) {
759 ath6kl_free_cookie(ar, ath6kl_cookie);
760 continue;
761 }
762
763 if (status) {
764 if (status == -ECANCELED)
765 /* a packet was flushed */
766 flushing[if_idx] = true;
767
768 vif->net_stats.tx_errors++;
769
770 if (status != -ENOSPC && status != -ECANCELED)
771 ath6kl_warn("tx complete error: %d\n", status);
772
773 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
774 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
775 __func__, skb, packet->buf, packet->act_len,
776 eid, "error!");
777 } else {
778 ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
779 "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
780 __func__, skb, packet->buf, packet->act_len,
781 eid, "OK");
782
783 flushing[if_idx] = false;
784 vif->net_stats.tx_packets++;
785 vif->net_stats.tx_bytes += skb->len;
786 }
787
788 ath6kl_tx_clear_node_map(vif, eid, map_no);
789
790 ath6kl_free_cookie(ar, ath6kl_cookie);
791
792 if (test_bit(NETQ_STOPPED, &vif->flags))
793 clear_bit(NETQ_STOPPED, &vif->flags);
794 }
795
796 spin_unlock_bh(&ar->lock);
797
798 __skb_queue_purge(&skb_queue);
799
800 /* FIXME: Locking */
801 spin_lock_bh(&ar->list_lock);
802 list_for_each_entry(vif, &ar->vif_list, list) {
803 if (test_bit(CONNECTED, &vif->flags) &&
804 !flushing[vif->fw_vif_idx]) {
805 spin_unlock_bh(&ar->list_lock);
806 netif_wake_queue(vif->ndev);
807 spin_lock_bh(&ar->list_lock);
808 }
809 }
810 spin_unlock_bh(&ar->list_lock);
811
812 if (wake_event)
813 wake_up(&ar->event_wq);
814
815 return;
816 }
817
818 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
819 {
820 int i;
821
822 /* flush all the data (non-control) streams */
823 for (i = 0; i < WMM_NUM_AC; i++)
824 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
825 ATH6KL_DATA_PKT_TAG);
826 }
827
828 /* Rx functions */
829
830 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
831 struct sk_buff *skb)
832 {
833 if (!skb)
834 return;
835
836 skb->dev = dev;
837
838 if (!(skb->dev->flags & IFF_UP)) {
839 dev_kfree_skb(skb);
840 return;
841 }
842
843 skb->protocol = eth_type_trans(skb, skb->dev);
844
845 netif_rx_ni(skb);
846 }
847
848 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
849 {
850 struct sk_buff *skb;
851
852 while (num) {
853 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
854 if (!skb) {
855 ath6kl_err("netbuf allocation failed\n");
856 return;
857 }
858 skb_queue_tail(q, skb);
859 num--;
860 }
861 }
862
863 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
864 {
865 struct sk_buff *skb = NULL;
866
867 if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
868 (AGGR_NUM_OF_FREE_NETBUFS >> 2))
869 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
870 AGGR_NUM_OF_FREE_NETBUFS);
871
872 skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
873
874 return skb;
875 }
876
877 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
878 {
879 struct ath6kl *ar = target->dev->ar;
880 struct sk_buff *skb;
881 int rx_buf;
882 int n_buf_refill;
883 struct htc_packet *packet;
884 struct list_head queue;
885
886 n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
887 ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
888
889 if (n_buf_refill <= 0)
890 return;
891
892 INIT_LIST_HEAD(&queue);
893
894 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
895 "%s: providing htc with %d buffers at eid=%d\n",
896 __func__, n_buf_refill, endpoint);
897
898 for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
899 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
900 if (!skb)
901 break;
902
903 packet = (struct htc_packet *) skb->head;
904 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
905 size_t len = skb_headlen(skb);
906 skb->data = PTR_ALIGN(skb->data - 4, 4);
907 skb_set_tail_pointer(skb, len);
908 }
909 set_htc_rxpkt_info(packet, skb, skb->data,
910 ATH6KL_BUFFER_SIZE, endpoint);
911 packet->skb = skb;
912 list_add_tail(&packet->list, &queue);
913 }
914
915 if (!list_empty(&queue))
916 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
917 }
918
919 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
920 {
921 struct htc_packet *packet;
922 struct sk_buff *skb;
923
924 while (count) {
925 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
926 if (!skb)
927 return;
928
929 packet = (struct htc_packet *) skb->head;
930 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
931 size_t len = skb_headlen(skb);
932 skb->data = PTR_ALIGN(skb->data - 4, 4);
933 skb_set_tail_pointer(skb, len);
934 }
935 set_htc_rxpkt_info(packet, skb, skb->data,
936 ATH6KL_AMSDU_BUFFER_SIZE, 0);
937 packet->skb = skb;
938
939 spin_lock_bh(&ar->lock);
940 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
941 spin_unlock_bh(&ar->lock);
942 count--;
943 }
944 }
945
946 /*
947 * Callback to allocate a receive buffer for a pending packet. We use a
948 * pre-allocated list of buffers of maximum AMSDU size (4K).
949 */
950 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
951 enum htc_endpoint_id endpoint,
952 int len)
953 {
954 struct ath6kl *ar = target->dev->ar;
955 struct htc_packet *packet = NULL;
956 struct list_head *pkt_pos;
957 int refill_cnt = 0, depth = 0;
958
959 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
960 __func__, endpoint, len);
961
962 if ((len <= ATH6KL_BUFFER_SIZE) ||
963 (len > ATH6KL_AMSDU_BUFFER_SIZE))
964 return NULL;
965
966 spin_lock_bh(&ar->lock);
967
968 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
969 spin_unlock_bh(&ar->lock);
970 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
971 goto refill_buf;
972 }
973
974 packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
975 struct htc_packet, list);
976 list_del(&packet->list);
977 list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
978 depth++;
979
980 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
981 spin_unlock_bh(&ar->lock);
982
983 /* set actual endpoint ID */
984 packet->endpoint = endpoint;
985
986 refill_buf:
987 if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
988 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
989
990 return packet;
991 }
992
993 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
994 struct rxtid *rxtid, struct sk_buff *skb)
995 {
996 struct sk_buff *new_skb;
997 struct ethhdr *hdr;
998 u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
999 u8 *framep;
1000
1001 mac_hdr_len = sizeof(struct ethhdr);
1002 framep = skb->data + mac_hdr_len;
1003 amsdu_len = skb->len - mac_hdr_len;
1004
1005 while (amsdu_len > mac_hdr_len) {
1006 hdr = (struct ethhdr *) framep;
1007 payload_8023_len = ntohs(hdr->h_proto);
1008
1009 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
1010 payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
1011 ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
1012 payload_8023_len);
1013 break;
1014 }
1015
1016 frame_8023_len = payload_8023_len + mac_hdr_len;
1017 new_skb = aggr_get_free_skb(p_aggr);
1018 if (!new_skb) {
1019 ath6kl_err("no buffer available\n");
1020 break;
1021 }
1022
1023 memcpy(new_skb->data, framep, frame_8023_len);
1024 skb_put(new_skb, frame_8023_len);
1025 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
1026 ath6kl_err("dot3_2_dix error\n");
1027 dev_kfree_skb(new_skb);
1028 break;
1029 }
1030
1031 skb_queue_tail(&rxtid->q, new_skb);
1032
1033 /* Is this the last subframe within this aggregate ? */
1034 if ((amsdu_len - frame_8023_len) == 0)
1035 break;
1036
1037 /* Add the length of A-MSDU subframe padding bytes -
1038 * Round to nearest word.
1039 */
1040 frame_8023_len = ALIGN(frame_8023_len, 4);
1041
1042 framep += frame_8023_len;
1043 amsdu_len -= frame_8023_len;
1044 }
1045
1046 dev_kfree_skb(skb);
1047 }
1048
1049 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1050 u16 seq_no, u8 order)
1051 {
1052 struct sk_buff *skb;
1053 struct rxtid *rxtid;
1054 struct skb_hold_q *node;
1055 u16 idx, idx_end, seq_end;
1056 struct rxtid_stats *stats;
1057
1058 rxtid = &agg_conn->rx_tid[tid];
1059 stats = &agg_conn->stat[tid];
1060
1061 spin_lock_bh(&rxtid->lock);
1062 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1063
1064 /*
1065 * idx_end is typically the last possible frame in the window,
1066 * but changes to 'the' seq_no, when BAR comes. If seq_no
1067 * is non-zero, we will go up to that and stop.
1068 * Note: last seq no in current window will occupy the same
1069 * index position as index that is just previous to start.
1070 * An imp point : if win_sz is 7, for seq_no space of 4095,
1071 * then, there would be holes when sequence wrap around occurs.
1072 * Target should judiciously choose the win_sz, based on
1073 * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1074 * 2, 4, 8, 16 win_sz works fine).
1075 * We must deque from "idx" to "idx_end", including both.
1076 */
1077 seq_end = seq_no ? seq_no : rxtid->seq_next;
1078 idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1079
1080 do {
1081 node = &rxtid->hold_q[idx];
1082 if ((order == 1) && (!node->skb))
1083 break;
1084
1085 if (node->skb) {
1086 if (node->is_amsdu)
1087 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1088 node->skb);
1089 else
1090 skb_queue_tail(&rxtid->q, node->skb);
1091 node->skb = NULL;
1092 } else
1093 stats->num_hole++;
1094
1095 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1096 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1097 } while (idx != idx_end);
1098
1099 spin_unlock_bh(&rxtid->lock);
1100
1101 stats->num_delivered += skb_queue_len(&rxtid->q);
1102
1103 while ((skb = skb_dequeue(&rxtid->q)))
1104 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1105 }
1106
1107 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1108 u16 seq_no,
1109 bool is_amsdu, struct sk_buff *frame)
1110 {
1111 struct rxtid *rxtid;
1112 struct rxtid_stats *stats;
1113 struct sk_buff *skb;
1114 struct skb_hold_q *node;
1115 u16 idx, st, cur, end;
1116 bool is_queued = false;
1117 u16 extended_end;
1118
1119 rxtid = &agg_conn->rx_tid[tid];
1120 stats = &agg_conn->stat[tid];
1121
1122 stats->num_into_aggr++;
1123
1124 if (!rxtid->aggr) {
1125 if (is_amsdu) {
1126 aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1127 is_queued = true;
1128 stats->num_amsdu++;
1129 while ((skb = skb_dequeue(&rxtid->q)))
1130 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1131 skb);
1132 }
1133 return is_queued;
1134 }
1135
1136 /* Check the incoming sequence no, if it's in the window */
1137 st = rxtid->seq_next;
1138 cur = seq_no;
1139 end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1140
1141 if (((st < end) && (cur < st || cur > end)) ||
1142 ((st > end) && (cur > end) && (cur < st))) {
1143 extended_end = (end + rxtid->hold_q_sz - 1) &
1144 ATH6KL_MAX_SEQ_NO;
1145
1146 if (((end < extended_end) &&
1147 (cur < end || cur > extended_end)) ||
1148 ((end > extended_end) && (cur > extended_end) &&
1149 (cur < end))) {
1150 aggr_deque_frms(agg_conn, tid, 0, 0);
1151 spin_lock_bh(&rxtid->lock);
1152 if (cur >= rxtid->hold_q_sz - 1)
1153 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1154 else
1155 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1156 (rxtid->hold_q_sz - 2 - cur);
1157 spin_unlock_bh(&rxtid->lock);
1158 } else {
1159 /*
1160 * Dequeue only those frames that are outside the
1161 * new shifted window.
1162 */
1163 if (cur >= rxtid->hold_q_sz - 1)
1164 st = cur - (rxtid->hold_q_sz - 1);
1165 else
1166 st = ATH6KL_MAX_SEQ_NO -
1167 (rxtid->hold_q_sz - 2 - cur);
1168
1169 aggr_deque_frms(agg_conn, tid, st, 0);
1170 }
1171
1172 stats->num_oow++;
1173 }
1174
1175 idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1176
1177 node = &rxtid->hold_q[idx];
1178
1179 spin_lock_bh(&rxtid->lock);
1180
1181 /*
1182 * Is the cur frame duplicate or something beyond our window(hold_q
1183 * -> which is 2x, already)?
1184 *
1185 * 1. Duplicate is easy - drop incoming frame.
1186 * 2. Not falling in current sliding window.
1187 * 2a. is the frame_seq_no preceding current tid_seq_no?
1188 * -> drop the frame. perhaps sender did not get our ACK.
1189 * this is taken care of above.
1190 * 2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1191 * -> Taken care of it above, by moving window forward.
1192 */
1193 dev_kfree_skb(node->skb);
1194 stats->num_dups++;
1195
1196 node->skb = frame;
1197 is_queued = true;
1198 node->is_amsdu = is_amsdu;
1199 node->seq_no = seq_no;
1200
1201 if (node->is_amsdu)
1202 stats->num_amsdu++;
1203 else
1204 stats->num_mpdu++;
1205
1206 spin_unlock_bh(&rxtid->lock);
1207
1208 aggr_deque_frms(agg_conn, tid, 0, 1);
1209
1210 if (agg_conn->timer_scheduled)
1211 return is_queued;
1212
1213 spin_lock_bh(&rxtid->lock);
1214 for (idx = 0 ; idx < rxtid->hold_q_sz; idx++) {
1215 if (rxtid->hold_q[idx].skb) {
1216 /*
1217 * There is a frame in the queue and no
1218 * timer so start a timer to ensure that
1219 * the frame doesn't remain stuck
1220 * forever.
1221 */
1222 agg_conn->timer_scheduled = true;
1223 mod_timer(&agg_conn->timer,
1224 (jiffies + (HZ * AGGR_RX_TIMEOUT) / 1000));
1225 rxtid->timer_mon = true;
1226 break;
1227 }
1228 }
1229 spin_unlock_bh(&rxtid->lock);
1230
1231 return is_queued;
1232 }
1233
1234 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1235 struct ath6kl_sta *conn)
1236 {
1237 struct ath6kl *ar = vif->ar;
1238 bool is_apsdq_empty, is_apsdq_empty_at_start;
1239 u32 num_frames_to_deliver, flags;
1240 struct sk_buff *skb = NULL;
1241
1242 /*
1243 * If the APSD q for this STA is not empty, dequeue and
1244 * send a pkt from the head of the q. Also update the
1245 * More data bit in the WMI_DATA_HDR if there are
1246 * more pkts for this STA in the APSD q.
1247 * If there are no more pkts for this STA,
1248 * update the APSD bitmap for this STA.
1249 */
1250
1251 num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1252 ATH6KL_APSD_FRAME_MASK;
1253 /*
1254 * Number of frames to send in a service period is
1255 * indicated by the station
1256 * in the QOS_INFO of the association request
1257 * If it is zero, send all frames
1258 */
1259 if (!num_frames_to_deliver)
1260 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1261
1262 spin_lock_bh(&conn->psq_lock);
1263 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1264 spin_unlock_bh(&conn->psq_lock);
1265 is_apsdq_empty_at_start = is_apsdq_empty;
1266
1267 while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1268
1269 spin_lock_bh(&conn->psq_lock);
1270 skb = skb_dequeue(&conn->apsdq);
1271 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1272 spin_unlock_bh(&conn->psq_lock);
1273
1274 /*
1275 * Set the STA flag to Trigger delivery,
1276 * so that the frame will go out
1277 */
1278 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1279 num_frames_to_deliver--;
1280
1281 /* Last frame in the service period, set EOSP or queue empty */
1282 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1283 conn->sta_flags |= STA_PS_APSD_EOSP;
1284
1285 ath6kl_data_tx(skb, vif->ndev);
1286 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1287 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1288 }
1289
1290 if (is_apsdq_empty) {
1291 if (is_apsdq_empty_at_start)
1292 flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1293 else
1294 flags = 0;
1295
1296 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1297 vif->fw_vif_idx,
1298 conn->aid, 0, flags);
1299 }
1300
1301 return;
1302 }
1303
1304 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1305 {
1306 struct ath6kl *ar = target->dev->ar;
1307 struct sk_buff *skb = packet->pkt_cntxt;
1308 struct wmi_rx_meta_v2 *meta;
1309 struct wmi_data_hdr *dhdr;
1310 int min_hdr_len;
1311 u8 meta_type, dot11_hdr = 0;
1312 u8 pad_before_data_start;
1313 int status = packet->status;
1314 enum htc_endpoint_id ept = packet->endpoint;
1315 bool is_amsdu, prev_ps, ps_state = false;
1316 bool trig_state = false;
1317 struct ath6kl_sta *conn = NULL;
1318 struct sk_buff *skb1 = NULL;
1319 struct ethhdr *datap = NULL;
1320 struct ath6kl_vif *vif;
1321 struct aggr_info_conn *aggr_conn;
1322 u16 seq_no, offset;
1323 u8 tid, if_idx;
1324
1325 ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1326 "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1327 __func__, ar, ept, skb, packet->buf,
1328 packet->act_len, status);
1329
1330 if (status || packet->act_len < HTC_HDR_LENGTH) {
1331 dev_kfree_skb(skb);
1332 return;
1333 }
1334
1335 skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1336 skb_pull(skb, HTC_HDR_LENGTH);
1337
1338 ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1339 skb->data, skb->len);
1340
1341 if (ept == ar->ctrl_ep) {
1342 if (test_bit(WMI_ENABLED, &ar->flag)) {
1343 ath6kl_check_wow_status(ar);
1344 ath6kl_wmi_control_rx(ar->wmi, skb);
1345 return;
1346 }
1347 if_idx =
1348 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1349 } else {
1350 if_idx =
1351 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1352 }
1353
1354 vif = ath6kl_get_vif_by_index(ar, if_idx);
1355 if (!vif) {
1356 dev_kfree_skb(skb);
1357 return;
1358 }
1359
1360 /*
1361 * Take lock to protect buffer counts and adaptive power throughput
1362 * state.
1363 */
1364 spin_lock_bh(&vif->if_lock);
1365
1366 vif->net_stats.rx_packets++;
1367 vif->net_stats.rx_bytes += packet->act_len;
1368
1369 spin_unlock_bh(&vif->if_lock);
1370
1371 skb->dev = vif->ndev;
1372
1373 if (!test_bit(WMI_ENABLED, &ar->flag)) {
1374 if (EPPING_ALIGNMENT_PAD > 0)
1375 skb_pull(skb, EPPING_ALIGNMENT_PAD);
1376 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1377 return;
1378 }
1379
1380 ath6kl_check_wow_status(ar);
1381
1382 min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1383 sizeof(struct ath6kl_llc_snap_hdr);
1384
1385 dhdr = (struct wmi_data_hdr *) skb->data;
1386
1387 /*
1388 * In the case of AP mode we may receive NULL data frames
1389 * that do not have LLC hdr. They are 16 bytes in size.
1390 * Allow these frames in the AP mode.
1391 */
1392 if (vif->nw_type != AP_NETWORK &&
1393 ((packet->act_len < min_hdr_len) ||
1394 (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1395 ath6kl_info("frame len is too short or too long\n");
1396 vif->net_stats.rx_errors++;
1397 vif->net_stats.rx_length_errors++;
1398 dev_kfree_skb(skb);
1399 return;
1400 }
1401
1402 /* Get the Power save state of the STA */
1403 if (vif->nw_type == AP_NETWORK) {
1404 meta_type = wmi_data_hdr_get_meta(dhdr);
1405
1406 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1407 WMI_DATA_HDR_PS_MASK);
1408
1409 offset = sizeof(struct wmi_data_hdr);
1410 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1411
1412 switch (meta_type) {
1413 case 0:
1414 break;
1415 case WMI_META_VERSION_1:
1416 offset += sizeof(struct wmi_rx_meta_v1);
1417 break;
1418 case WMI_META_VERSION_2:
1419 offset += sizeof(struct wmi_rx_meta_v2);
1420 break;
1421 default:
1422 break;
1423 }
1424
1425 datap = (struct ethhdr *) (skb->data + offset);
1426 conn = ath6kl_find_sta(vif, datap->h_source);
1427
1428 if (!conn) {
1429 dev_kfree_skb(skb);
1430 return;
1431 }
1432
1433 /*
1434 * If there is a change in PS state of the STA,
1435 * take appropriate steps:
1436 *
1437 * 1. If Sleep-->Awake, flush the psq for the STA
1438 * Clear the PVB for the STA.
1439 * 2. If Awake-->Sleep, Starting queueing frames
1440 * the STA.
1441 */
1442 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1443
1444 if (ps_state)
1445 conn->sta_flags |= STA_PS_SLEEP;
1446 else
1447 conn->sta_flags &= ~STA_PS_SLEEP;
1448
1449 /* Accept trigger only when the station is in sleep */
1450 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1451 ath6kl_uapsd_trigger_frame_rx(vif, conn);
1452
1453 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1454 if (!(conn->sta_flags & STA_PS_SLEEP)) {
1455 struct sk_buff *skbuff = NULL;
1456 bool is_apsdq_empty;
1457 struct ath6kl_mgmt_buff *mgmt;
1458 u8 idx;
1459
1460 spin_lock_bh(&conn->psq_lock);
1461 while (conn->mgmt_psq_len > 0) {
1462 mgmt = list_first_entry(
1463 &conn->mgmt_psq,
1464 struct ath6kl_mgmt_buff,
1465 list);
1466 list_del(&mgmt->list);
1467 conn->mgmt_psq_len--;
1468 spin_unlock_bh(&conn->psq_lock);
1469 idx = vif->fw_vif_idx;
1470
1471 ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1472 idx,
1473 mgmt->id,
1474 mgmt->freq,
1475 mgmt->wait,
1476 mgmt->buf,
1477 mgmt->len,
1478 mgmt->no_cck);
1479
1480 kfree(mgmt);
1481 spin_lock_bh(&conn->psq_lock);
1482 }
1483 conn->mgmt_psq_len = 0;
1484 while ((skbuff = skb_dequeue(&conn->psq))) {
1485 spin_unlock_bh(&conn->psq_lock);
1486 ath6kl_data_tx(skbuff, vif->ndev);
1487 spin_lock_bh(&conn->psq_lock);
1488 }
1489
1490 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1491 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1492 spin_unlock_bh(&conn->psq_lock);
1493 ath6kl_data_tx(skbuff, vif->ndev);
1494 spin_lock_bh(&conn->psq_lock);
1495 }
1496 spin_unlock_bh(&conn->psq_lock);
1497
1498 if (!is_apsdq_empty)
1499 ath6kl_wmi_set_apsd_bfrd_traf(
1500 ar->wmi,
1501 vif->fw_vif_idx,
1502 conn->aid, 0, 0);
1503
1504 /* Clear the PVB for this STA */
1505 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1506 conn->aid, 0);
1507 }
1508 }
1509
1510 /* drop NULL data frames here */
1511 if ((packet->act_len < min_hdr_len) ||
1512 (packet->act_len >
1513 WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1514 dev_kfree_skb(skb);
1515 return;
1516 }
1517 }
1518
1519 is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1520 tid = wmi_data_hdr_get_up(dhdr);
1521 seq_no = wmi_data_hdr_get_seqno(dhdr);
1522 meta_type = wmi_data_hdr_get_meta(dhdr);
1523 dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1524 pad_before_data_start =
1525 (le16_to_cpu(dhdr->info3) >> WMI_DATA_HDR_PAD_BEFORE_DATA_SHIFT)
1526 & WMI_DATA_HDR_PAD_BEFORE_DATA_MASK;
1527
1528 skb_pull(skb, sizeof(struct wmi_data_hdr));
1529
1530 switch (meta_type) {
1531 case WMI_META_VERSION_1:
1532 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1533 break;
1534 case WMI_META_VERSION_2:
1535 meta = (struct wmi_rx_meta_v2 *) skb->data;
1536 if (meta->csum_flags & 0x1) {
1537 skb->ip_summed = CHECKSUM_COMPLETE;
1538 skb->csum = (__force __wsum) meta->csum;
1539 }
1540 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1541 break;
1542 default:
1543 break;
1544 }
1545
1546 skb_pull(skb, pad_before_data_start);
1547
1548 if (dot11_hdr)
1549 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1550 else if (!is_amsdu)
1551 status = ath6kl_wmi_dot3_2_dix(skb);
1552
1553 if (status) {
1554 /*
1555 * Drop frames that could not be processed (lack of
1556 * memory, etc.)
1557 */
1558 dev_kfree_skb(skb);
1559 return;
1560 }
1561
1562 if (!(vif->ndev->flags & IFF_UP)) {
1563 dev_kfree_skb(skb);
1564 return;
1565 }
1566
1567 if (vif->nw_type == AP_NETWORK) {
1568 datap = (struct ethhdr *) skb->data;
1569 if (is_multicast_ether_addr(datap->h_dest))
1570 /*
1571 * Bcast/Mcast frames should be sent to the
1572 * OS stack as well as on the air.
1573 */
1574 skb1 = skb_copy(skb, GFP_ATOMIC);
1575 else {
1576 /*
1577 * Search for a connected STA with dstMac
1578 * as the Mac address. If found send the
1579 * frame to it on the air else send the
1580 * frame up the stack.
1581 */
1582 conn = ath6kl_find_sta(vif, datap->h_dest);
1583
1584 if (conn && ar->intra_bss) {
1585 skb1 = skb;
1586 skb = NULL;
1587 } else if (conn && !ar->intra_bss) {
1588 dev_kfree_skb(skb);
1589 skb = NULL;
1590 }
1591 }
1592 if (skb1)
1593 ath6kl_data_tx(skb1, vif->ndev);
1594
1595 if (skb == NULL) {
1596 /* nothing to deliver up the stack */
1597 return;
1598 }
1599 }
1600
1601 datap = (struct ethhdr *) skb->data;
1602
1603 if (is_unicast_ether_addr(datap->h_dest)) {
1604 if (vif->nw_type == AP_NETWORK) {
1605 conn = ath6kl_find_sta(vif, datap->h_source);
1606 if (!conn)
1607 return;
1608 aggr_conn = conn->aggr_conn;
1609 } else
1610 aggr_conn = vif->aggr_cntxt->aggr_conn;
1611
1612 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1613 is_amsdu, skb)) {
1614 /* aggregation code will handle the skb */
1615 return;
1616 }
1617 } else if (!is_broadcast_ether_addr(datap->h_dest))
1618 vif->net_stats.multicast++;
1619
1620 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1621 }
1622
1623 static void aggr_timeout(unsigned long arg)
1624 {
1625 u8 i, j;
1626 struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg;
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 struct rxtid_stats *stats;
1705 u16 hold_q_size;
1706 u8 tid, aid;
1707
1708 if (vif->nw_type == AP_NETWORK) {
1709 aid = ath6kl_get_aid(tid_mux);
1710 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1711 if (sta)
1712 aggr_conn = sta->aggr_conn;
1713 } else
1714 aggr_conn = vif->aggr_cntxt->aggr_conn;
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 stats = &aggr_conn->stat[tid];
1725
1726 if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1727 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1728 __func__, win_sz, tid);
1729
1730 if (rxtid->aggr)
1731 aggr_delete_tid_state(aggr_conn, tid);
1732
1733 rxtid->seq_next = seq_no;
1734 hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1735 rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1736 if (!rxtid->hold_q)
1737 return;
1738
1739 rxtid->win_sz = win_sz;
1740 rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1741 if (!skb_queue_empty(&rxtid->q))
1742 return;
1743
1744 rxtid->aggr = true;
1745 }
1746
1747 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1748 struct aggr_info_conn *aggr_conn)
1749 {
1750 struct rxtid *rxtid;
1751 u8 i;
1752
1753 aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1754 aggr_conn->dev = vif->ndev;
1755 init_timer(&aggr_conn->timer);
1756 aggr_conn->timer.function = aggr_timeout;
1757 aggr_conn->timer.data = (unsigned long) aggr_conn;
1758 aggr_conn->aggr_info = aggr_info;
1759
1760 aggr_conn->timer_scheduled = false;
1761
1762 for (i = 0; i < NUM_OF_TIDS; i++) {
1763 rxtid = &aggr_conn->rx_tid[i];
1764 rxtid->aggr = false;
1765 rxtid->timer_mon = false;
1766 skb_queue_head_init(&rxtid->q);
1767 spin_lock_init(&rxtid->lock);
1768 }
1769
1770 }
1771
1772 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1773 {
1774 struct aggr_info *p_aggr = NULL;
1775
1776 p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1777 if (!p_aggr) {
1778 ath6kl_err("failed to alloc memory for aggr_node\n");
1779 return NULL;
1780 }
1781
1782 p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1783 if (!p_aggr->aggr_conn) {
1784 ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1785 kfree(p_aggr);
1786 return NULL;
1787 }
1788
1789 aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1790
1791 skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1792 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1793
1794 return p_aggr;
1795 }
1796
1797 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1798 {
1799 struct ath6kl_sta *sta;
1800 struct rxtid *rxtid;
1801 struct aggr_info_conn *aggr_conn = NULL;
1802 u8 tid, aid;
1803
1804 if (vif->nw_type == AP_NETWORK) {
1805 aid = ath6kl_get_aid(tid_mux);
1806 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1807 if (sta)
1808 aggr_conn = sta->aggr_conn;
1809 } else
1810 aggr_conn = vif->aggr_cntxt->aggr_conn;
1811
1812 if (!aggr_conn)
1813 return;
1814
1815 tid = ath6kl_get_tid(tid_mux);
1816 if (tid >= NUM_OF_TIDS)
1817 return;
1818
1819 rxtid = &aggr_conn->rx_tid[tid];
1820
1821 if (rxtid->aggr)
1822 aggr_delete_tid_state(aggr_conn, tid);
1823 }
1824
1825 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1826 {
1827 u8 tid;
1828
1829 if (!aggr_conn)
1830 return;
1831
1832 if (aggr_conn->timer_scheduled) {
1833 del_timer(&aggr_conn->timer);
1834 aggr_conn->timer_scheduled = false;
1835 }
1836
1837 for (tid = 0; tid < NUM_OF_TIDS; tid++)
1838 aggr_delete_tid_state(aggr_conn, tid);
1839 }
1840
1841 /* clean up our amsdu buffer list */
1842 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1843 {
1844 struct htc_packet *packet, *tmp_pkt;
1845
1846 spin_lock_bh(&ar->lock);
1847 if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1848 spin_unlock_bh(&ar->lock);
1849 return;
1850 }
1851
1852 list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1853 list) {
1854 list_del(&packet->list);
1855 spin_unlock_bh(&ar->lock);
1856 dev_kfree_skb(packet->pkt_cntxt);
1857 spin_lock_bh(&ar->lock);
1858 }
1859
1860 spin_unlock_bh(&ar->lock);
1861 }
1862
1863 void aggr_module_destroy(struct aggr_info *aggr_info)
1864 {
1865 if (!aggr_info)
1866 return;
1867
1868 aggr_reset_state(aggr_info->aggr_conn);
1869 skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1870 kfree(aggr_info->aggr_conn);
1871 kfree(aggr_info);
1872 }
Linux with added FPC-III support