mwifiex: add missing USB-descriptor endianness conversion
[muen/linux.git] / drivers / net / wireless / ath / ath6kl / txrx.c
1 /*
2  * Copyright (c) 2004-2011 Atheros Communications Inc.
3  * Copyright (c) 2011-2012 Qualcomm Atheros, Inc.
4  *
5  * Permission to use, copy, modify, and/or distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include "core.h"
21 #include "debug.h"
22 #include "htc-ops.h"
23 #include "trace.h"
24
25 /*
26  * tid - tid_mux0..tid_mux3
27  * aid - tid_mux4..tid_mux7
28  */
29 #define ATH6KL_TID_MASK 0xf
30 #define ATH6KL_AID_SHIFT 4
31
32 static inline u8 ath6kl_get_tid(u8 tid_mux)
33 {
34         return tid_mux & ATH6KL_TID_MASK;
35 }
36
37 static inline u8 ath6kl_get_aid(u8 tid_mux)
38 {
39         return tid_mux >> ATH6KL_AID_SHIFT;
40 }
41
42 static u8 ath6kl_ibss_map_epid(struct sk_buff *skb, struct net_device *dev,
43                                u32 *map_no)
44 {
45         struct ath6kl *ar = ath6kl_priv(dev);
46         struct ethhdr *eth_hdr;
47         u32 i, ep_map = -1;
48         u8 *datap;
49
50         *map_no = 0;
51         datap = skb->data;
52         eth_hdr = (struct ethhdr *) (datap + sizeof(struct wmi_data_hdr));
53
54         if (is_multicast_ether_addr(eth_hdr->h_dest))
55                 return ENDPOINT_2;
56
57         for (i = 0; i < ar->node_num; i++) {
58                 if (memcmp(eth_hdr->h_dest, ar->node_map[i].mac_addr,
59                            ETH_ALEN) == 0) {
60                         *map_no = i + 1;
61                         ar->node_map[i].tx_pend++;
62                         return ar->node_map[i].ep_id;
63                 }
64
65                 if ((ep_map == -1) && !ar->node_map[i].tx_pend)
66                         ep_map = i;
67         }
68
69         if (ep_map == -1) {
70                 ep_map = ar->node_num;
71                 ar->node_num++;
72                 if (ar->node_num > MAX_NODE_NUM)
73                         return ENDPOINT_UNUSED;
74         }
75
76         memcpy(ar->node_map[ep_map].mac_addr, eth_hdr->h_dest, ETH_ALEN);
77
78         for (i = ENDPOINT_2; i <= ENDPOINT_5; i++) {
79                 if (!ar->tx_pending[i]) {
80                         ar->node_map[ep_map].ep_id = i;
81                         break;
82                 }
83
84                 /*
85                  * No free endpoint is available, start redistribution on
86                  * the inuse endpoints.
87                  */
88                 if (i == ENDPOINT_5) {
89                         ar->node_map[ep_map].ep_id = ar->next_ep_id;
90                         ar->next_ep_id++;
91                         if (ar->next_ep_id > ENDPOINT_5)
92                                 ar->next_ep_id = ENDPOINT_2;
93                 }
94         }
95
96         *map_no = ep_map + 1;
97         ar->node_map[ep_map].tx_pend++;
98
99         return ar->node_map[ep_map].ep_id;
100 }
101
102 static bool ath6kl_process_uapsdq(struct ath6kl_sta *conn,
103                                 struct ath6kl_vif *vif,
104                                 struct sk_buff *skb,
105                                 u32 *flags)
106 {
107         struct ath6kl *ar = vif->ar;
108         bool is_apsdq_empty = false;
109         struct ethhdr *datap = (struct ethhdr *) skb->data;
110         u8 up = 0, traffic_class, *ip_hdr;
111         u16 ether_type;
112         struct ath6kl_llc_snap_hdr *llc_hdr;
113
114         if (conn->sta_flags & STA_PS_APSD_TRIGGER) {
115                 /*
116                  * This tx is because of a uAPSD trigger, determine
117                  * more and EOSP bit. Set EOSP if queue is empty
118                  * or sufficient frames are delivered for this trigger.
119                  */
120                 spin_lock_bh(&conn->psq_lock);
121                 if (!skb_queue_empty(&conn->apsdq))
122                         *flags |= WMI_DATA_HDR_FLAGS_MORE;
123                 else if (conn->sta_flags & STA_PS_APSD_EOSP)
124                         *flags |= WMI_DATA_HDR_FLAGS_EOSP;
125                 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
126                 spin_unlock_bh(&conn->psq_lock);
127                 return false;
128         } else if (!conn->apsd_info) {
129                 return false;
130         }
131
132         if (test_bit(WMM_ENABLED, &vif->flags)) {
133                 ether_type = be16_to_cpu(datap->h_proto);
134                 if (is_ethertype(ether_type)) {
135                         /* packet is in DIX format  */
136                         ip_hdr = (u8 *)(datap + 1);
137                 } else {
138                         /* packet is in 802.3 format */
139                         llc_hdr = (struct ath6kl_llc_snap_hdr *)
140                                                         (datap + 1);
141                         ether_type = be16_to_cpu(llc_hdr->eth_type);
142                         ip_hdr = (u8 *)(llc_hdr + 1);
143                 }
144
145                 if (ether_type == IP_ETHERTYPE)
146                         up = ath6kl_wmi_determine_user_priority(
147                                                         ip_hdr, 0);
148         }
149
150         traffic_class = ath6kl_wmi_get_traffic_class(up);
151
152         if ((conn->apsd_info & (1 << traffic_class)) == 0)
153                 return false;
154
155         /* Queue the frames if the STA is sleeping */
156         spin_lock_bh(&conn->psq_lock);
157         is_apsdq_empty = skb_queue_empty(&conn->apsdq);
158         skb_queue_tail(&conn->apsdq, skb);
159         spin_unlock_bh(&conn->psq_lock);
160
161         /*
162          * If this is the first pkt getting queued
163          * for this STA, update the PVB for this STA
164          */
165         if (is_apsdq_empty) {
166                 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
167                                               vif->fw_vif_idx,
168                                               conn->aid, 1, 0);
169         }
170         *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
171
172         return true;
173 }
174
175 static bool ath6kl_process_psq(struct ath6kl_sta *conn,
176                                 struct ath6kl_vif *vif,
177                                 struct sk_buff *skb,
178                                 u32 *flags)
179 {
180         bool is_psq_empty = false;
181         struct ath6kl *ar = vif->ar;
182
183         if (conn->sta_flags & STA_PS_POLLED) {
184                 spin_lock_bh(&conn->psq_lock);
185                 if (!skb_queue_empty(&conn->psq))
186                         *flags |= WMI_DATA_HDR_FLAGS_MORE;
187                 spin_unlock_bh(&conn->psq_lock);
188                 return false;
189         }
190
191         /* Queue the frames if the STA is sleeping */
192         spin_lock_bh(&conn->psq_lock);
193         is_psq_empty = skb_queue_empty(&conn->psq);
194         skb_queue_tail(&conn->psq, skb);
195         spin_unlock_bh(&conn->psq_lock);
196
197         /*
198          * If this is the first pkt getting queued
199          * for this STA, update the PVB for this
200          * STA.
201          */
202         if (is_psq_empty)
203                 ath6kl_wmi_set_pvb_cmd(ar->wmi,
204                                        vif->fw_vif_idx,
205                                        conn->aid, 1);
206         return true;
207 }
208
209 static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb,
210                                 u32 *flags)
211 {
212         struct ethhdr *datap = (struct ethhdr *) skb->data;
213         struct ath6kl_sta *conn = NULL;
214         bool ps_queued = false;
215         struct ath6kl *ar = vif->ar;
216
217         if (is_multicast_ether_addr(datap->h_dest)) {
218                 u8 ctr = 0;
219                 bool q_mcast = false;
220
221                 for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
222                         if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) {
223                                 q_mcast = true;
224                                 break;
225                         }
226                 }
227
228                 if (q_mcast) {
229                         /*
230                          * If this transmit is not because of a Dtim Expiry
231                          * q it.
232                          */
233                         if (!test_bit(DTIM_EXPIRED, &vif->flags)) {
234                                 bool is_mcastq_empty = false;
235
236                                 spin_lock_bh(&ar->mcastpsq_lock);
237                                 is_mcastq_empty =
238                                         skb_queue_empty(&ar->mcastpsq);
239                                 skb_queue_tail(&ar->mcastpsq, skb);
240                                 spin_unlock_bh(&ar->mcastpsq_lock);
241
242                                 /*
243                                  * If this is the first Mcast pkt getting
244                                  * queued indicate to the target to set the
245                                  * BitmapControl LSB of the TIM IE.
246                                  */
247                                 if (is_mcastq_empty)
248                                         ath6kl_wmi_set_pvb_cmd(ar->wmi,
249                                                                vif->fw_vif_idx,
250                                                                MCAST_AID, 1);
251
252                                 ps_queued = true;
253                         } else {
254                                 /*
255                                  * This transmit is because of Dtim expiry.
256                                  * Determine if MoreData bit has to be set.
257                                  */
258                                 spin_lock_bh(&ar->mcastpsq_lock);
259                                 if (!skb_queue_empty(&ar->mcastpsq))
260                                         *flags |= WMI_DATA_HDR_FLAGS_MORE;
261                                 spin_unlock_bh(&ar->mcastpsq_lock);
262                         }
263                 }
264         } else {
265                 conn = ath6kl_find_sta(vif, datap->h_dest);
266                 if (!conn) {
267                         dev_kfree_skb(skb);
268
269                         /* Inform the caller that the skb is consumed */
270                         return true;
271                 }
272
273                 if (conn->sta_flags & STA_PS_SLEEP) {
274                         ps_queued = ath6kl_process_uapsdq(conn,
275                                                 vif, skb, flags);
276                         if (!(*flags & WMI_DATA_HDR_FLAGS_UAPSD))
277                                 ps_queued = ath6kl_process_psq(conn,
278                                                 vif, skb, flags);
279                 }
280         }
281         return ps_queued;
282 }
283
284 /* Tx functions */
285
286 int ath6kl_control_tx(void *devt, struct sk_buff *skb,
287                       enum htc_endpoint_id eid)
288 {
289         struct ath6kl *ar = devt;
290         int status = 0;
291         struct ath6kl_cookie *cookie = NULL;
292
293         trace_ath6kl_wmi_cmd(skb->data, skb->len);
294
295         if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW)) {
296                 dev_kfree_skb(skb);
297                 return -EACCES;
298         }
299
300         if (WARN_ON_ONCE(eid == ENDPOINT_UNUSED ||
301                          eid >= ENDPOINT_MAX)) {
302                 status = -EINVAL;
303                 goto fail_ctrl_tx;
304         }
305
306         spin_lock_bh(&ar->lock);
307
308         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
309                    "%s: skb=0x%p, len=0x%x eid =%d\n", __func__,
310                    skb, skb->len, eid);
311
312         if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) {
313                 /*
314                  * Control endpoint is full, don't allocate resources, we
315                  * are just going to drop this packet.
316                  */
317                 cookie = NULL;
318                 ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n",
319                            skb, skb->len);
320         } else {
321                 cookie = ath6kl_alloc_cookie(ar);
322         }
323
324         if (cookie == NULL) {
325                 spin_unlock_bh(&ar->lock);
326                 status = -ENOMEM;
327                 goto fail_ctrl_tx;
328         }
329
330         ar->tx_pending[eid]++;
331
332         if (eid != ar->ctrl_ep)
333                 ar->total_tx_data_pend++;
334
335         spin_unlock_bh(&ar->lock);
336
337         cookie->skb = skb;
338         cookie->map_no = 0;
339         set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
340                          eid, ATH6KL_CONTROL_PKT_TAG);
341         cookie->htc_pkt.skb = skb;
342
343         /*
344          * This interface is asynchronous, if there is an error, cleanup
345          * will happen in the TX completion callback.
346          */
347         ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
348
349         return 0;
350
351 fail_ctrl_tx:
352         dev_kfree_skb(skb);
353         return status;
354 }
355
356 int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
357 {
358         struct ath6kl *ar = ath6kl_priv(dev);
359         struct ath6kl_cookie *cookie = NULL;
360         enum htc_endpoint_id eid = ENDPOINT_UNUSED;
361         struct ath6kl_vif *vif = netdev_priv(dev);
362         u32 map_no = 0;
363         u16 htc_tag = ATH6KL_DATA_PKT_TAG;
364         u8 ac = 99; /* initialize to unmapped ac */
365         bool chk_adhoc_ps_mapping = false;
366         int ret;
367         struct wmi_tx_meta_v2 meta_v2;
368         void *meta;
369         u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed;
370         u8 meta_ver = 0;
371         u32 flags = 0;
372
373         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
374                    "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
375                    skb, skb->data, skb->len);
376
377         /* If target is not associated */
378         if (!test_bit(CONNECTED, &vif->flags))
379                 goto fail_tx;
380
381         if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON))
382                 goto fail_tx;
383
384         if (!test_bit(WMI_READY, &ar->flag))
385                 goto fail_tx;
386
387         /* AP mode Power saving processing */
388         if (vif->nw_type == AP_NETWORK) {
389                 if (ath6kl_powersave_ap(vif, skb, &flags))
390                         return 0;
391         }
392
393         if (test_bit(WMI_ENABLED, &ar->flag)) {
394                 if ((dev->features & NETIF_F_IP_CSUM) &&
395                     (csum == CHECKSUM_PARTIAL)) {
396                         csum_start = skb->csum_start -
397                                         (skb_network_header(skb) - skb->head) +
398                                         sizeof(struct ath6kl_llc_snap_hdr);
399                         csum_dest = skb->csum_offset + csum_start;
400                 }
401
402                 if (skb_headroom(skb) < dev->needed_headroom) {
403                         struct sk_buff *tmp_skb = skb;
404
405                         skb = skb_realloc_headroom(skb, dev->needed_headroom);
406                         kfree_skb(tmp_skb);
407                         if (skb == NULL) {
408                                 dev->stats.tx_dropped++;
409                                 return 0;
410                         }
411                 }
412
413                 if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) {
414                         ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n");
415                         goto fail_tx;
416                 }
417
418                 if ((dev->features & NETIF_F_IP_CSUM) &&
419                     (csum == CHECKSUM_PARTIAL)) {
420                         meta_v2.csum_start = csum_start;
421                         meta_v2.csum_dest = csum_dest;
422
423                         /* instruct target to calculate checksum */
424                         meta_v2.csum_flags = WMI_META_V2_FLAG_CSUM_OFFLOAD;
425                         meta_ver = WMI_META_VERSION_2;
426                         meta = &meta_v2;
427                 } else {
428                         meta_ver = 0;
429                         meta = NULL;
430                 }
431
432                 ret = ath6kl_wmi_data_hdr_add(ar->wmi, skb,
433                                 DATA_MSGTYPE, flags, 0,
434                                 meta_ver,
435                                 meta, vif->fw_vif_idx);
436
437                 if (ret) {
438                         ath6kl_warn("failed to add wmi data header:%d\n"
439                                 , ret);
440                         goto fail_tx;
441                 }
442
443                 if ((vif->nw_type == ADHOC_NETWORK) &&
444                     ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags))
445                         chk_adhoc_ps_mapping = true;
446                 else {
447                         /* get the stream mapping */
448                         ret = ath6kl_wmi_implicit_create_pstream(ar->wmi,
449                                     vif->fw_vif_idx, skb,
450                                     0, test_bit(WMM_ENABLED, &vif->flags), &ac);
451                         if (ret)
452                                 goto fail_tx;
453                 }
454         } else {
455                 goto fail_tx;
456         }
457
458         spin_lock_bh(&ar->lock);
459
460         if (chk_adhoc_ps_mapping)
461                 eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
462         else
463                 eid = ar->ac2ep_map[ac];
464
465         if (eid == 0 || eid == ENDPOINT_UNUSED) {
466                 ath6kl_err("eid %d is not mapped!\n", eid);
467                 spin_unlock_bh(&ar->lock);
468                 goto fail_tx;
469         }
470
471         /* allocate resource for this packet */
472         cookie = ath6kl_alloc_cookie(ar);
473
474         if (!cookie) {
475                 spin_unlock_bh(&ar->lock);
476                 goto fail_tx;
477         }
478
479         /* update counts while the lock is held */
480         ar->tx_pending[eid]++;
481         ar->total_tx_data_pend++;
482
483         spin_unlock_bh(&ar->lock);
484
485         if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
486             skb_cloned(skb)) {
487                 /*
488                  * We will touch (move the buffer data to align it. Since the
489                  * skb buffer is cloned and not only the header is changed, we
490                  * have to copy it to allow the changes. Since we are copying
491                  * the data here, we may as well align it by reserving suitable
492                  * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
493                  */
494                 struct sk_buff *nskb;
495
496                 nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
497                 if (nskb == NULL)
498                         goto fail_tx;
499                 kfree_skb(skb);
500                 skb = nskb;
501         }
502
503         cookie->skb = skb;
504         cookie->map_no = map_no;
505         set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
506                          eid, htc_tag);
507         cookie->htc_pkt.skb = skb;
508
509         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
510                         skb->data, skb->len);
511
512         /*
513          * HTC interface is asynchronous, if this fails, cleanup will
514          * happen in the ath6kl_tx_complete callback.
515          */
516         ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
517
518         return 0;
519
520 fail_tx:
521         dev_kfree_skb(skb);
522
523         dev->stats.tx_dropped++;
524         dev->stats.tx_aborted_errors++;
525
526         return 0;
527 }
528
529 /* indicate tx activity or inactivity on a WMI stream */
530 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
531 {
532         struct ath6kl *ar = devt;
533         enum htc_endpoint_id eid;
534         int i;
535
536         eid = ar->ac2ep_map[traffic_class];
537
538         if (!test_bit(WMI_ENABLED, &ar->flag))
539                 goto notify_htc;
540
541         spin_lock_bh(&ar->lock);
542
543         ar->ac_stream_active[traffic_class] = active;
544
545         if (active) {
546                 /*
547                  * Keep track of the active stream with the highest
548                  * priority.
549                  */
550                 if (ar->ac_stream_pri_map[traffic_class] >
551                     ar->hiac_stream_active_pri)
552                         /* set the new highest active priority */
553                         ar->hiac_stream_active_pri =
554                                         ar->ac_stream_pri_map[traffic_class];
555
556         } else {
557                 /*
558                  * We may have to search for the next active stream
559                  * that is the highest priority.
560                  */
561                 if (ar->hiac_stream_active_pri ==
562                         ar->ac_stream_pri_map[traffic_class]) {
563                         /*
564                          * The highest priority stream just went inactive
565                          * reset and search for the "next" highest "active"
566                          * priority stream.
567                          */
568                         ar->hiac_stream_active_pri = 0;
569
570                         for (i = 0; i < WMM_NUM_AC; i++) {
571                                 if (ar->ac_stream_active[i] &&
572                                     (ar->ac_stream_pri_map[i] >
573                                      ar->hiac_stream_active_pri))
574                                         /*
575                                          * Set the new highest active
576                                          * priority.
577                                          */
578                                         ar->hiac_stream_active_pri =
579                                                 ar->ac_stream_pri_map[i];
580                         }
581                 }
582         }
583
584         spin_unlock_bh(&ar->lock);
585
586 notify_htc:
587         /* notify HTC, this may cause credit distribution changes */
588         ath6kl_htc_activity_changed(ar->htc_target, eid, active);
589 }
590
591 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
592                                                struct htc_packet *packet)
593 {
594         struct ath6kl *ar = target->dev->ar;
595         struct ath6kl_vif *vif;
596         enum htc_endpoint_id endpoint = packet->endpoint;
597         enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
598
599         if (endpoint == ar->ctrl_ep) {
600                 /*
601                  * Under normal WMI if this is getting full, then something
602                  * is running rampant the host should not be exhausting the
603                  * WMI queue with too many commands the only exception to
604                  * this is during testing using endpointping.
605                  */
606                 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
607                 ath6kl_err("wmi ctrl ep is full\n");
608                 ath6kl_recovery_err_notify(ar, ATH6KL_FW_EP_FULL);
609                 return action;
610         }
611
612         if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
613                 return action;
614
615         /*
616          * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
617          * the highest active stream.
618          */
619         if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
620             ar->hiac_stream_active_pri &&
621             ar->cookie_count <=
622                         target->endpoint[endpoint].tx_drop_packet_threshold)
623                 /*
624                  * Give preference to the highest priority stream by
625                  * dropping the packets which overflowed.
626                  */
627                 action = HTC_SEND_FULL_DROP;
628
629         /* FIXME: Locking */
630         spin_lock_bh(&ar->list_lock);
631         list_for_each_entry(vif, &ar->vif_list, list) {
632                 if (vif->nw_type == ADHOC_NETWORK ||
633                     action != HTC_SEND_FULL_DROP) {
634                         spin_unlock_bh(&ar->list_lock);
635
636                         set_bit(NETQ_STOPPED, &vif->flags);
637                         netif_stop_queue(vif->ndev);
638
639                         return action;
640                 }
641         }
642         spin_unlock_bh(&ar->list_lock);
643
644         return action;
645 }
646
647 /* TODO this needs to be looked at */
648 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
649                                      enum htc_endpoint_id eid, u32 map_no)
650 {
651         struct ath6kl *ar = vif->ar;
652         u32 i;
653
654         if (vif->nw_type != ADHOC_NETWORK)
655                 return;
656
657         if (!ar->ibss_ps_enable)
658                 return;
659
660         if (eid == ar->ctrl_ep)
661                 return;
662
663         if (map_no == 0)
664                 return;
665
666         map_no--;
667         ar->node_map[map_no].tx_pend--;
668
669         if (ar->node_map[map_no].tx_pend)
670                 return;
671
672         if (map_no != (ar->node_num - 1))
673                 return;
674
675         for (i = ar->node_num; i > 0; i--) {
676                 if (ar->node_map[i - 1].tx_pend)
677                         break;
678
679                 memset(&ar->node_map[i - 1], 0,
680                        sizeof(struct ath6kl_node_mapping));
681                 ar->node_num--;
682         }
683 }
684
685 void ath6kl_tx_complete(struct htc_target *target,
686                         struct list_head *packet_queue)
687 {
688         struct ath6kl *ar = target->dev->ar;
689         struct sk_buff_head skb_queue;
690         struct htc_packet *packet;
691         struct sk_buff *skb;
692         struct ath6kl_cookie *ath6kl_cookie;
693         u32 map_no = 0;
694         int status;
695         enum htc_endpoint_id eid;
696         bool wake_event = false;
697         bool flushing[ATH6KL_VIF_MAX] = {false};
698         u8 if_idx;
699         struct ath6kl_vif *vif;
700
701         skb_queue_head_init(&skb_queue);
702
703         /* lock the driver as we update internal state */
704         spin_lock_bh(&ar->lock);
705
706         /* reap completed packets */
707         while (!list_empty(packet_queue)) {
708                 packet = list_first_entry(packet_queue, struct htc_packet,
709                                           list);
710                 list_del(&packet->list);
711
712                 if (WARN_ON_ONCE(packet->endpoint == ENDPOINT_UNUSED ||
713                                  packet->endpoint >= ENDPOINT_MAX))
714                         continue;
715
716                 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
717                 if (WARN_ON_ONCE(!ath6kl_cookie))
718                         continue;
719
720                 status = packet->status;
721                 skb = ath6kl_cookie->skb;
722                 eid = packet->endpoint;
723                 map_no = ath6kl_cookie->map_no;
724
725                 if (WARN_ON_ONCE(!skb || !skb->data)) {
726                         dev_kfree_skb(skb);
727                         ath6kl_free_cookie(ar, ath6kl_cookie);
728                         continue;
729                 }
730
731                 __skb_queue_tail(&skb_queue, skb);
732
733                 if (WARN_ON_ONCE(!status && (packet->act_len != skb->len))) {
734                         ath6kl_free_cookie(ar, ath6kl_cookie);
735                         continue;
736                 }
737
738                 ar->tx_pending[eid]--;
739
740                 if (eid != ar->ctrl_ep)
741                         ar->total_tx_data_pend--;
742
743                 if (eid == ar->ctrl_ep) {
744                         if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
745                                 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
746
747                         if (ar->tx_pending[eid] == 0)
748                                 wake_event = true;
749                 }
750
751                 if (eid == ar->ctrl_ep) {
752                         if_idx = wmi_cmd_hdr_get_if_idx(
753                                 (struct wmi_cmd_hdr *) packet->buf);
754                 } else {
755                         if_idx = wmi_data_hdr_get_if_idx(
756                                 (struct wmi_data_hdr *) packet->buf);
757                 }
758
759                 vif = ath6kl_get_vif_by_index(ar, if_idx);
760                 if (!vif) {
761                         ath6kl_free_cookie(ar, ath6kl_cookie);
762                         continue;
763                 }
764
765                 if (status) {
766                         if (status == -ECANCELED)
767                                 /* a packet was flushed  */
768                                 flushing[if_idx] = true;
769
770                         vif->ndev->stats.tx_errors++;
771
772                         if (status != -ENOSPC && status != -ECANCELED)
773                                 ath6kl_warn("tx complete error: %d\n", status);
774
775                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
776                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
777                                    __func__, skb, packet->buf, packet->act_len,
778                                    eid, "error!");
779                 } else {
780                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
781                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
782                                    __func__, skb, packet->buf, packet->act_len,
783                                    eid, "OK");
784
785                         flushing[if_idx] = false;
786                         vif->ndev->stats.tx_packets++;
787                         vif->ndev->stats.tx_bytes += skb->len;
788                 }
789
790                 ath6kl_tx_clear_node_map(vif, eid, map_no);
791
792                 ath6kl_free_cookie(ar, ath6kl_cookie);
793
794                 if (test_bit(NETQ_STOPPED, &vif->flags))
795                         clear_bit(NETQ_STOPPED, &vif->flags);
796         }
797
798         spin_unlock_bh(&ar->lock);
799
800         __skb_queue_purge(&skb_queue);
801
802         /* FIXME: Locking */
803         spin_lock_bh(&ar->list_lock);
804         list_for_each_entry(vif, &ar->vif_list, list) {
805                 if (test_bit(CONNECTED, &vif->flags) &&
806                     !flushing[vif->fw_vif_idx]) {
807                         spin_unlock_bh(&ar->list_lock);
808                         netif_wake_queue(vif->ndev);
809                         spin_lock_bh(&ar->list_lock);
810                 }
811         }
812         spin_unlock_bh(&ar->list_lock);
813
814         if (wake_event)
815                 wake_up(&ar->event_wq);
816
817         return;
818 }
819
820 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
821 {
822         int i;
823
824         /* flush all the data (non-control) streams */
825         for (i = 0; i < WMM_NUM_AC; i++)
826                 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
827                                       ATH6KL_DATA_PKT_TAG);
828 }
829
830 /* Rx functions */
831
832 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
833                                               struct sk_buff *skb)
834 {
835         if (!skb)
836                 return;
837
838         skb->dev = dev;
839
840         if (!(skb->dev->flags & IFF_UP)) {
841                 dev_kfree_skb(skb);
842                 return;
843         }
844
845         skb->protocol = eth_type_trans(skb, skb->dev);
846
847         netif_rx_ni(skb);
848 }
849
850 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
851 {
852         struct sk_buff *skb;
853
854         while (num) {
855                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
856                 if (!skb) {
857                         ath6kl_err("netbuf allocation failed\n");
858                         return;
859                 }
860                 skb_queue_tail(q, skb);
861                 num--;
862         }
863 }
864
865 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
866 {
867         struct sk_buff *skb = NULL;
868
869         if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
870             (AGGR_NUM_OF_FREE_NETBUFS >> 2))
871                 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
872                                      AGGR_NUM_OF_FREE_NETBUFS);
873
874         skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
875
876         return skb;
877 }
878
879 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
880 {
881         struct ath6kl *ar = target->dev->ar;
882         struct sk_buff *skb;
883         int rx_buf;
884         int n_buf_refill;
885         struct htc_packet *packet;
886         struct list_head queue;
887
888         n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
889                           ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
890
891         if (n_buf_refill <= 0)
892                 return;
893
894         INIT_LIST_HEAD(&queue);
895
896         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
897                    "%s: providing htc with %d buffers at eid=%d\n",
898                    __func__, n_buf_refill, endpoint);
899
900         for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
901                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
902                 if (!skb)
903                         break;
904
905                 packet = (struct htc_packet *) skb->head;
906                 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
907                         size_t len = skb_headlen(skb);
908                         skb->data = PTR_ALIGN(skb->data - 4, 4);
909                         skb_set_tail_pointer(skb, len);
910                 }
911                 set_htc_rxpkt_info(packet, skb, skb->data,
912                                    ATH6KL_BUFFER_SIZE, endpoint);
913                 packet->skb = skb;
914                 list_add_tail(&packet->list, &queue);
915         }
916
917         if (!list_empty(&queue))
918                 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
919 }
920
921 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
922 {
923         struct htc_packet *packet;
924         struct sk_buff *skb;
925
926         while (count) {
927                 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
928                 if (!skb)
929                         return;
930
931                 packet = (struct htc_packet *) skb->head;
932                 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
933                         size_t len = skb_headlen(skb);
934                         skb->data = PTR_ALIGN(skb->data - 4, 4);
935                         skb_set_tail_pointer(skb, len);
936                 }
937                 set_htc_rxpkt_info(packet, skb, skb->data,
938                                    ATH6KL_AMSDU_BUFFER_SIZE, 0);
939                 packet->skb = skb;
940
941                 spin_lock_bh(&ar->lock);
942                 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
943                 spin_unlock_bh(&ar->lock);
944                 count--;
945         }
946 }
947
948 /*
949  * Callback to allocate a receive buffer for a pending packet. We use a
950  * pre-allocated list of buffers of maximum AMSDU size (4K).
951  */
952 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
953                                             enum htc_endpoint_id endpoint,
954                                             int len)
955 {
956         struct ath6kl *ar = target->dev->ar;
957         struct htc_packet *packet = NULL;
958         struct list_head *pkt_pos;
959         int refill_cnt = 0, depth = 0;
960
961         ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
962                    __func__, endpoint, len);
963
964         if ((len <= ATH6KL_BUFFER_SIZE) ||
965             (len > ATH6KL_AMSDU_BUFFER_SIZE))
966                 return NULL;
967
968         spin_lock_bh(&ar->lock);
969
970         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
971                 spin_unlock_bh(&ar->lock);
972                 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
973                 goto refill_buf;
974         }
975
976         packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
977                                   struct htc_packet, list);
978         list_del(&packet->list);
979         list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
980                 depth++;
981
982         refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
983         spin_unlock_bh(&ar->lock);
984
985         /* set actual endpoint ID */
986         packet->endpoint = endpoint;
987
988 refill_buf:
989         if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
990                 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
991
992         return packet;
993 }
994
995 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
996                              struct rxtid *rxtid, struct sk_buff *skb)
997 {
998         struct sk_buff *new_skb;
999         struct ethhdr *hdr;
1000         u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
1001         u8 *framep;
1002
1003         mac_hdr_len = sizeof(struct ethhdr);
1004         framep = skb->data + mac_hdr_len;
1005         amsdu_len = skb->len - mac_hdr_len;
1006
1007         while (amsdu_len > mac_hdr_len) {
1008                 hdr = (struct ethhdr *) framep;
1009                 payload_8023_len = ntohs(hdr->h_proto);
1010
1011                 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
1012                     payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
1013                         ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
1014                                    payload_8023_len);
1015                         break;
1016                 }
1017
1018                 frame_8023_len = payload_8023_len + mac_hdr_len;
1019                 new_skb = aggr_get_free_skb(p_aggr);
1020                 if (!new_skb) {
1021                         ath6kl_err("no buffer available\n");
1022                         break;
1023                 }
1024
1025                 memcpy(new_skb->data, framep, frame_8023_len);
1026                 skb_put(new_skb, frame_8023_len);
1027                 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
1028                         ath6kl_err("dot3_2_dix error\n");
1029                         dev_kfree_skb(new_skb);
1030                         break;
1031                 }
1032
1033                 skb_queue_tail(&rxtid->q, new_skb);
1034
1035                 /* Is this the last subframe within this aggregate ? */
1036                 if ((amsdu_len - frame_8023_len) == 0)
1037                         break;
1038
1039                 /* Add the length of A-MSDU subframe padding bytes -
1040                  * Round to nearest word.
1041                  */
1042                 frame_8023_len = ALIGN(frame_8023_len, 4);
1043
1044                 framep += frame_8023_len;
1045                 amsdu_len -= frame_8023_len;
1046         }
1047
1048         dev_kfree_skb(skb);
1049 }
1050
1051 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1052                             u16 seq_no, u8 order)
1053 {
1054         struct sk_buff *skb;
1055         struct rxtid *rxtid;
1056         struct skb_hold_q *node;
1057         u16 idx, idx_end, seq_end;
1058         struct rxtid_stats *stats;
1059
1060         rxtid = &agg_conn->rx_tid[tid];
1061         stats = &agg_conn->stat[tid];
1062
1063         spin_lock_bh(&rxtid->lock);
1064         idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1065
1066         /*
1067          * idx_end is typically the last possible frame in the window,
1068          * but changes to 'the' seq_no, when BAR comes. If seq_no
1069          * is non-zero, we will go up to that and stop.
1070          * Note: last seq no in current window will occupy the same
1071          * index position as index that is just previous to start.
1072          * An imp point : if win_sz is 7, for seq_no space of 4095,
1073          * then, there would be holes when sequence wrap around occurs.
1074          * Target should judiciously choose the win_sz, based on
1075          * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1076          * 2, 4, 8, 16 win_sz works fine).
1077          * We must deque from "idx" to "idx_end", including both.
1078          */
1079         seq_end = seq_no ? seq_no : rxtid->seq_next;
1080         idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1081
1082         do {
1083                 node = &rxtid->hold_q[idx];
1084                 if ((order == 1) && (!node->skb))
1085                         break;
1086
1087                 if (node->skb) {
1088                         if (node->is_amsdu)
1089                                 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1090                                                  node->skb);
1091                         else
1092                                 skb_queue_tail(&rxtid->q, node->skb);
1093                         node->skb = NULL;
1094                 } else {
1095                         stats->num_hole++;
1096                 }
1097
1098                 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1099                 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1100         } while (idx != idx_end);
1101
1102         spin_unlock_bh(&rxtid->lock);
1103
1104         stats->num_delivered += skb_queue_len(&rxtid->q);
1105
1106         while ((skb = skb_dequeue(&rxtid->q)))
1107                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1108 }
1109
1110 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1111                                   u16 seq_no,
1112                                   bool is_amsdu, struct sk_buff *frame)
1113 {
1114         struct rxtid *rxtid;
1115         struct rxtid_stats *stats;
1116         struct sk_buff *skb;
1117         struct skb_hold_q *node;
1118         u16 idx, st, cur, end;
1119         bool is_queued = false;
1120         u16 extended_end;
1121
1122         rxtid = &agg_conn->rx_tid[tid];
1123         stats = &agg_conn->stat[tid];
1124
1125         stats->num_into_aggr++;
1126
1127         if (!rxtid->aggr) {
1128                 if (is_amsdu) {
1129                         aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1130                         is_queued = true;
1131                         stats->num_amsdu++;
1132                         while ((skb = skb_dequeue(&rxtid->q)))
1133                                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1134                                                                   skb);
1135                 }
1136                 return is_queued;
1137         }
1138
1139         /* Check the incoming sequence no, if it's in the window */
1140         st = rxtid->seq_next;
1141         cur = seq_no;
1142         end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1143
1144         if (((st < end) && (cur < st || cur > end)) ||
1145             ((st > end) && (cur > end) && (cur < st))) {
1146                 extended_end = (end + rxtid->hold_q_sz - 1) &
1147                         ATH6KL_MAX_SEQ_NO;
1148
1149                 if (((end < extended_end) &&
1150                      (cur < end || cur > extended_end)) ||
1151                     ((end > extended_end) && (cur > extended_end) &&
1152                      (cur < end))) {
1153                         aggr_deque_frms(agg_conn, tid, 0, 0);
1154                         spin_lock_bh(&rxtid->lock);
1155                         if (cur >= rxtid->hold_q_sz - 1)
1156                                 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1157                         else
1158                                 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1159                                                   (rxtid->hold_q_sz - 2 - cur);
1160                         spin_unlock_bh(&rxtid->lock);
1161                 } else {
1162                         /*
1163                          * Dequeue only those frames that are outside the
1164                          * new shifted window.
1165                          */
1166                         if (cur >= rxtid->hold_q_sz - 1)
1167                                 st = cur - (rxtid->hold_q_sz - 1);
1168                         else
1169                                 st = ATH6KL_MAX_SEQ_NO -
1170                                         (rxtid->hold_q_sz - 2 - cur);
1171
1172                         aggr_deque_frms(agg_conn, tid, st, 0);
1173                 }
1174
1175                 stats->num_oow++;
1176         }
1177
1178         idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1179
1180         node = &rxtid->hold_q[idx];
1181
1182         spin_lock_bh(&rxtid->lock);
1183
1184         /*
1185          * Is the cur frame duplicate or something beyond our window(hold_q
1186          * -> which is 2x, already)?
1187          *
1188          * 1. Duplicate is easy - drop incoming frame.
1189          * 2. Not falling in current sliding window.
1190          *  2a. is the frame_seq_no preceding current tid_seq_no?
1191          *      -> drop the frame. perhaps sender did not get our ACK.
1192          *         this is taken care of above.
1193          *  2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1194          *      -> Taken care of it above, by moving window forward.
1195          */
1196         dev_kfree_skb(node->skb);
1197         stats->num_dups++;
1198
1199         node->skb = frame;
1200         is_queued = true;
1201         node->is_amsdu = is_amsdu;
1202         node->seq_no = seq_no;
1203
1204         if (node->is_amsdu)
1205                 stats->num_amsdu++;
1206         else
1207                 stats->num_mpdu++;
1208
1209         spin_unlock_bh(&rxtid->lock);
1210
1211         aggr_deque_frms(agg_conn, tid, 0, 1);
1212
1213         if (agg_conn->timer_scheduled)
1214                 return is_queued;
1215
1216         spin_lock_bh(&rxtid->lock);
1217         for (idx = 0; idx < rxtid->hold_q_sz; idx++) {
1218                 if (rxtid->hold_q[idx].skb) {
1219                         /*
1220                          * There is a frame in the queue and no
1221                          * timer so start a timer to ensure that
1222                          * the frame doesn't remain stuck
1223                          * forever.
1224                          */
1225                         agg_conn->timer_scheduled = true;
1226                         mod_timer(&agg_conn->timer,
1227                                   (jiffies + (HZ * AGGR_RX_TIMEOUT) / 1000));
1228                         rxtid->timer_mon = true;
1229                         break;
1230                 }
1231         }
1232         spin_unlock_bh(&rxtid->lock);
1233
1234         return is_queued;
1235 }
1236
1237 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1238                                                  struct ath6kl_sta *conn)
1239 {
1240         struct ath6kl *ar = vif->ar;
1241         bool is_apsdq_empty, is_apsdq_empty_at_start;
1242         u32 num_frames_to_deliver, flags;
1243         struct sk_buff *skb = NULL;
1244
1245         /*
1246          * If the APSD q for this STA is not empty, dequeue and
1247          * send a pkt from the head of the q. Also update the
1248          * More data bit in the WMI_DATA_HDR if there are
1249          * more pkts for this STA in the APSD q.
1250          * If there are no more pkts for this STA,
1251          * update the APSD bitmap for this STA.
1252          */
1253
1254         num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1255                                                     ATH6KL_APSD_FRAME_MASK;
1256         /*
1257          * Number of frames to send in a service period is
1258          * indicated by the station
1259          * in the QOS_INFO of the association request
1260          * If it is zero, send all frames
1261          */
1262         if (!num_frames_to_deliver)
1263                 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1264
1265         spin_lock_bh(&conn->psq_lock);
1266         is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1267         spin_unlock_bh(&conn->psq_lock);
1268         is_apsdq_empty_at_start = is_apsdq_empty;
1269
1270         while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1271                 spin_lock_bh(&conn->psq_lock);
1272                 skb = skb_dequeue(&conn->apsdq);
1273                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1274                 spin_unlock_bh(&conn->psq_lock);
1275
1276                 /*
1277                  * Set the STA flag to Trigger delivery,
1278                  * so that the frame will go out
1279                  */
1280                 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1281                 num_frames_to_deliver--;
1282
1283                 /* Last frame in the service period, set EOSP or queue empty */
1284                 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1285                         conn->sta_flags |= STA_PS_APSD_EOSP;
1286
1287                 ath6kl_data_tx(skb, vif->ndev);
1288                 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1289                 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1290         }
1291
1292         if (is_apsdq_empty) {
1293                 if (is_apsdq_empty_at_start)
1294                         flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1295                 else
1296                         flags = 0;
1297
1298                 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1299                                               vif->fw_vif_idx,
1300                                               conn->aid, 0, flags);
1301         }
1302
1303         return;
1304 }
1305
1306 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1307 {
1308         struct ath6kl *ar = target->dev->ar;
1309         struct sk_buff *skb = packet->pkt_cntxt;
1310         struct wmi_rx_meta_v2 *meta;
1311         struct wmi_data_hdr *dhdr;
1312         int min_hdr_len;
1313         u8 meta_type, dot11_hdr = 0;
1314         u8 pad_before_data_start;
1315         int status = packet->status;
1316         enum htc_endpoint_id ept = packet->endpoint;
1317         bool is_amsdu, prev_ps, ps_state = false;
1318         bool trig_state = false;
1319         struct ath6kl_sta *conn = NULL;
1320         struct sk_buff *skb1 = NULL;
1321         struct ethhdr *datap = NULL;
1322         struct ath6kl_vif *vif;
1323         struct aggr_info_conn *aggr_conn;
1324         u16 seq_no, offset;
1325         u8 tid, if_idx;
1326
1327         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1328                    "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1329                    __func__, ar, ept, skb, packet->buf,
1330                    packet->act_len, status);
1331
1332         if (status || packet->act_len < HTC_HDR_LENGTH) {
1333                 dev_kfree_skb(skb);
1334                 return;
1335         }
1336
1337         skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1338         skb_pull(skb, HTC_HDR_LENGTH);
1339
1340         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1341                         skb->data, skb->len);
1342
1343         if (ept == ar->ctrl_ep) {
1344                 if (test_bit(WMI_ENABLED, &ar->flag)) {
1345                         ath6kl_check_wow_status(ar);
1346                         ath6kl_wmi_control_rx(ar->wmi, skb);
1347                         return;
1348                 }
1349                 if_idx =
1350                 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1351         } else {
1352                 if_idx =
1353                 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1354         }
1355
1356         vif = ath6kl_get_vif_by_index(ar, if_idx);
1357         if (!vif) {
1358                 dev_kfree_skb(skb);
1359                 return;
1360         }
1361
1362         /*
1363          * Take lock to protect buffer counts and adaptive power throughput
1364          * state.
1365          */
1366         spin_lock_bh(&vif->if_lock);
1367
1368         vif->ndev->stats.rx_packets++;
1369         vif->ndev->stats.rx_bytes += packet->act_len;
1370
1371         spin_unlock_bh(&vif->if_lock);
1372
1373         skb->dev = vif->ndev;
1374
1375         if (!test_bit(WMI_ENABLED, &ar->flag)) {
1376                 if (EPPING_ALIGNMENT_PAD > 0)
1377                         skb_pull(skb, EPPING_ALIGNMENT_PAD);
1378                 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1379                 return;
1380         }
1381
1382         ath6kl_check_wow_status(ar);
1383
1384         min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1385                       sizeof(struct ath6kl_llc_snap_hdr);
1386
1387         dhdr = (struct wmi_data_hdr *) skb->data;
1388
1389         /*
1390          * In the case of AP mode we may receive NULL data frames
1391          * that do not have LLC hdr. They are 16 bytes in size.
1392          * Allow these frames in the AP mode.
1393          */
1394         if (vif->nw_type != AP_NETWORK &&
1395             ((packet->act_len < min_hdr_len) ||
1396              (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1397                 ath6kl_info("frame len is too short or too long\n");
1398                 vif->ndev->stats.rx_errors++;
1399                 vif->ndev->stats.rx_length_errors++;
1400                 dev_kfree_skb(skb);
1401                 return;
1402         }
1403
1404         pad_before_data_start =
1405                 (le16_to_cpu(dhdr->info3) >> WMI_DATA_HDR_PAD_BEFORE_DATA_SHIFT)
1406                         & WMI_DATA_HDR_PAD_BEFORE_DATA_MASK;
1407
1408         /* Get the Power save state of the STA */
1409         if (vif->nw_type == AP_NETWORK) {
1410                 meta_type = wmi_data_hdr_get_meta(dhdr);
1411
1412                 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1413                               WMI_DATA_HDR_PS_MASK);
1414
1415                 offset = sizeof(struct wmi_data_hdr) + pad_before_data_start;
1416                 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1417
1418                 switch (meta_type) {
1419                 case 0:
1420                         break;
1421                 case WMI_META_VERSION_1:
1422                         offset += sizeof(struct wmi_rx_meta_v1);
1423                         break;
1424                 case WMI_META_VERSION_2:
1425                         offset += sizeof(struct wmi_rx_meta_v2);
1426                         break;
1427                 default:
1428                         break;
1429                 }
1430
1431                 datap = (struct ethhdr *) (skb->data + offset);
1432                 conn = ath6kl_find_sta(vif, datap->h_source);
1433
1434                 if (!conn) {
1435                         dev_kfree_skb(skb);
1436                         return;
1437                 }
1438
1439                 /*
1440                  * If there is a change in PS state of the STA,
1441                  * take appropriate steps:
1442                  *
1443                  * 1. If Sleep-->Awake, flush the psq for the STA
1444                  *    Clear the PVB for the STA.
1445                  * 2. If Awake-->Sleep, Starting queueing frames
1446                  *    the STA.
1447                  */
1448                 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1449
1450                 if (ps_state)
1451                         conn->sta_flags |= STA_PS_SLEEP;
1452                 else
1453                         conn->sta_flags &= ~STA_PS_SLEEP;
1454
1455                 /* Accept trigger only when the station is in sleep */
1456                 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1457                         ath6kl_uapsd_trigger_frame_rx(vif, conn);
1458
1459                 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1460                         if (!(conn->sta_flags & STA_PS_SLEEP)) {
1461                                 struct sk_buff *skbuff = NULL;
1462                                 bool is_apsdq_empty;
1463                                 struct ath6kl_mgmt_buff *mgmt;
1464                                 u8 idx;
1465
1466                                 spin_lock_bh(&conn->psq_lock);
1467                                 while (conn->mgmt_psq_len > 0) {
1468                                         mgmt = list_first_entry(
1469                                                         &conn->mgmt_psq,
1470                                                         struct ath6kl_mgmt_buff,
1471                                                         list);
1472                                         list_del(&mgmt->list);
1473                                         conn->mgmt_psq_len--;
1474                                         spin_unlock_bh(&conn->psq_lock);
1475                                         idx = vif->fw_vif_idx;
1476
1477                                         ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1478                                                                  idx,
1479                                                                  mgmt->id,
1480                                                                  mgmt->freq,
1481                                                                  mgmt->wait,
1482                                                                  mgmt->buf,
1483                                                                  mgmt->len,
1484                                                                  mgmt->no_cck);
1485
1486                                         kfree(mgmt);
1487                                         spin_lock_bh(&conn->psq_lock);
1488                                 }
1489                                 conn->mgmt_psq_len = 0;
1490                                 while ((skbuff = skb_dequeue(&conn->psq))) {
1491                                         spin_unlock_bh(&conn->psq_lock);
1492                                         ath6kl_data_tx(skbuff, vif->ndev);
1493                                         spin_lock_bh(&conn->psq_lock);
1494                                 }
1495
1496                                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1497                                 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1498                                         spin_unlock_bh(&conn->psq_lock);
1499                                         ath6kl_data_tx(skbuff, vif->ndev);
1500                                         spin_lock_bh(&conn->psq_lock);
1501                                 }
1502                                 spin_unlock_bh(&conn->psq_lock);
1503
1504                                 if (!is_apsdq_empty)
1505                                         ath6kl_wmi_set_apsd_bfrd_traf(
1506                                                         ar->wmi,
1507                                                         vif->fw_vif_idx,
1508                                                         conn->aid, 0, 0);
1509
1510                                 /* Clear the PVB for this STA */
1511                                 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1512                                                        conn->aid, 0);
1513                         }
1514                 }
1515
1516                 /* drop NULL data frames here */
1517                 if ((packet->act_len < min_hdr_len) ||
1518                     (packet->act_len >
1519                      WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1520                         dev_kfree_skb(skb);
1521                         return;
1522                 }
1523         }
1524
1525         is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1526         tid = wmi_data_hdr_get_up(dhdr);
1527         seq_no = wmi_data_hdr_get_seqno(dhdr);
1528         meta_type = wmi_data_hdr_get_meta(dhdr);
1529         dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1530
1531         skb_pull(skb, sizeof(struct wmi_data_hdr));
1532
1533         switch (meta_type) {
1534         case WMI_META_VERSION_1:
1535                 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1536                 break;
1537         case WMI_META_VERSION_2:
1538                 meta = (struct wmi_rx_meta_v2 *) skb->data;
1539                 if (meta->csum_flags & 0x1) {
1540                         skb->ip_summed = CHECKSUM_COMPLETE;
1541                         skb->csum = (__force __wsum) meta->csum;
1542                 }
1543                 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1544                 break;
1545         default:
1546                 break;
1547         }
1548
1549         skb_pull(skb, pad_before_data_start);
1550
1551         if (dot11_hdr)
1552                 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1553         else if (!is_amsdu)
1554                 status = ath6kl_wmi_dot3_2_dix(skb);
1555
1556         if (status) {
1557                 /*
1558                  * Drop frames that could not be processed (lack of
1559                  * memory, etc.)
1560                  */
1561                 dev_kfree_skb(skb);
1562                 return;
1563         }
1564
1565         if (!(vif->ndev->flags & IFF_UP)) {
1566                 dev_kfree_skb(skb);
1567                 return;
1568         }
1569
1570         if (vif->nw_type == AP_NETWORK) {
1571                 datap = (struct ethhdr *) skb->data;
1572                 if (is_multicast_ether_addr(datap->h_dest))
1573                         /*
1574                          * Bcast/Mcast frames should be sent to the
1575                          * OS stack as well as on the air.
1576                          */
1577                         skb1 = skb_copy(skb, GFP_ATOMIC);
1578                 else {
1579                         /*
1580                          * Search for a connected STA with dstMac
1581                          * as the Mac address. If found send the
1582                          * frame to it on the air else send the
1583                          * frame up the stack.
1584                          */
1585                         conn = ath6kl_find_sta(vif, datap->h_dest);
1586
1587                         if (conn && ar->intra_bss) {
1588                                 skb1 = skb;
1589                                 skb = NULL;
1590                         } else if (conn && !ar->intra_bss) {
1591                                 dev_kfree_skb(skb);
1592                                 skb = NULL;
1593                         }
1594                 }
1595                 if (skb1)
1596                         ath6kl_data_tx(skb1, vif->ndev);
1597
1598                 if (skb == NULL) {
1599                         /* nothing to deliver up the stack */
1600                         return;
1601                 }
1602         }
1603
1604         datap = (struct ethhdr *) skb->data;
1605
1606         if (is_unicast_ether_addr(datap->h_dest)) {
1607                 if (vif->nw_type == AP_NETWORK) {
1608                         conn = ath6kl_find_sta(vif, datap->h_source);
1609                         if (!conn)
1610                                 return;
1611                         aggr_conn = conn->aggr_conn;
1612                 } else {
1613                         aggr_conn = vif->aggr_cntxt->aggr_conn;
1614                 }
1615
1616                 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1617                                           is_amsdu, skb)) {
1618                         /* aggregation code will handle the skb */
1619                         return;
1620                 }
1621         } else if (!is_broadcast_ether_addr(datap->h_dest)) {
1622                 vif->ndev->stats.multicast++;
1623         }
1624
1625         ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1626 }
1627
1628 static void aggr_timeout(unsigned long arg)
1629 {
1630         u8 i, j;
1631         struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg;
1632         struct rxtid *rxtid;
1633         struct rxtid_stats *stats;
1634
1635         for (i = 0; i < NUM_OF_TIDS; i++) {
1636                 rxtid = &aggr_conn->rx_tid[i];
1637                 stats = &aggr_conn->stat[i];
1638
1639                 if (!rxtid->aggr || !rxtid->timer_mon)
1640                         continue;
1641
1642                 stats->num_timeouts++;
1643                 ath6kl_dbg(ATH6KL_DBG_AGGR,
1644                            "aggr timeout (st %d end %d)\n",
1645                            rxtid->seq_next,
1646                            ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1647                             ATH6KL_MAX_SEQ_NO));
1648                 aggr_deque_frms(aggr_conn, i, 0, 0);
1649         }
1650
1651         aggr_conn->timer_scheduled = false;
1652
1653         for (i = 0; i < NUM_OF_TIDS; i++) {
1654                 rxtid = &aggr_conn->rx_tid[i];
1655
1656                 if (rxtid->aggr && rxtid->hold_q) {
1657                         spin_lock_bh(&rxtid->lock);
1658                         for (j = 0; j < rxtid->hold_q_sz; j++) {
1659                                 if (rxtid->hold_q[j].skb) {
1660                                         aggr_conn->timer_scheduled = true;
1661                                         rxtid->timer_mon = true;
1662                                         break;
1663                                 }
1664                         }
1665                         spin_unlock_bh(&rxtid->lock);
1666
1667                         if (j >= rxtid->hold_q_sz)
1668                                 rxtid->timer_mon = false;
1669                 }
1670         }
1671
1672         if (aggr_conn->timer_scheduled)
1673                 mod_timer(&aggr_conn->timer,
1674                           jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1675 }
1676
1677 static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid)
1678 {
1679         struct rxtid *rxtid;
1680         struct rxtid_stats *stats;
1681
1682         if (!aggr_conn || tid >= NUM_OF_TIDS)
1683                 return;
1684
1685         rxtid = &aggr_conn->rx_tid[tid];
1686         stats = &aggr_conn->stat[tid];
1687
1688         if (rxtid->aggr)
1689                 aggr_deque_frms(aggr_conn, tid, 0, 0);
1690
1691         rxtid->aggr = false;
1692         rxtid->timer_mon = false;
1693         rxtid->win_sz = 0;
1694         rxtid->seq_next = 0;
1695         rxtid->hold_q_sz = 0;
1696
1697         kfree(rxtid->hold_q);
1698         rxtid->hold_q = NULL;
1699
1700         memset(stats, 0, sizeof(struct rxtid_stats));
1701 }
1702
1703 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no,
1704                              u8 win_sz)
1705 {
1706         struct ath6kl_sta *sta;
1707         struct aggr_info_conn *aggr_conn = NULL;
1708         struct rxtid *rxtid;
1709         struct rxtid_stats *stats;
1710         u16 hold_q_size;
1711         u8 tid, aid;
1712
1713         if (vif->nw_type == AP_NETWORK) {
1714                 aid = ath6kl_get_aid(tid_mux);
1715                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1716                 if (sta)
1717                         aggr_conn = sta->aggr_conn;
1718         } else {
1719                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1720         }
1721
1722         if (!aggr_conn)
1723                 return;
1724
1725         tid = ath6kl_get_tid(tid_mux);
1726         if (tid >= NUM_OF_TIDS)
1727                 return;
1728
1729         rxtid = &aggr_conn->rx_tid[tid];
1730         stats = &aggr_conn->stat[tid];
1731
1732         if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1733                 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1734                            __func__, win_sz, tid);
1735
1736         if (rxtid->aggr)
1737                 aggr_delete_tid_state(aggr_conn, tid);
1738
1739         rxtid->seq_next = seq_no;
1740         hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1741         rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1742         if (!rxtid->hold_q)
1743                 return;
1744
1745         rxtid->win_sz = win_sz;
1746         rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1747         if (!skb_queue_empty(&rxtid->q))
1748                 return;
1749
1750         rxtid->aggr = true;
1751 }
1752
1753 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1754                     struct aggr_info_conn *aggr_conn)
1755 {
1756         struct rxtid *rxtid;
1757         u8 i;
1758
1759         aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1760         aggr_conn->dev = vif->ndev;
1761         init_timer(&aggr_conn->timer);
1762         aggr_conn->timer.function = aggr_timeout;
1763         aggr_conn->timer.data = (unsigned long) aggr_conn;
1764         aggr_conn->aggr_info = aggr_info;
1765
1766         aggr_conn->timer_scheduled = false;
1767
1768         for (i = 0; i < NUM_OF_TIDS; i++) {
1769                 rxtid = &aggr_conn->rx_tid[i];
1770                 rxtid->aggr = false;
1771                 rxtid->timer_mon = false;
1772                 skb_queue_head_init(&rxtid->q);
1773                 spin_lock_init(&rxtid->lock);
1774         }
1775 }
1776
1777 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1778 {
1779         struct aggr_info *p_aggr = NULL;
1780
1781         p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1782         if (!p_aggr) {
1783                 ath6kl_err("failed to alloc memory for aggr_node\n");
1784                 return NULL;
1785         }
1786
1787         p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1788         if (!p_aggr->aggr_conn) {
1789                 ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1790                 kfree(p_aggr);
1791                 return NULL;
1792         }
1793
1794         aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1795
1796         skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1797         ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1798
1799         return p_aggr;
1800 }
1801
1802 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1803 {
1804         struct ath6kl_sta *sta;
1805         struct rxtid *rxtid;
1806         struct aggr_info_conn *aggr_conn = NULL;
1807         u8 tid, aid;
1808
1809         if (vif->nw_type == AP_NETWORK) {
1810                 aid = ath6kl_get_aid(tid_mux);
1811                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1812                 if (sta)
1813                         aggr_conn = sta->aggr_conn;
1814         } else {
1815                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1816         }
1817
1818         if (!aggr_conn)
1819                 return;
1820
1821         tid = ath6kl_get_tid(tid_mux);
1822         if (tid >= NUM_OF_TIDS)
1823                 return;
1824
1825         rxtid = &aggr_conn->rx_tid[tid];
1826
1827         if (rxtid->aggr)
1828                 aggr_delete_tid_state(aggr_conn, tid);
1829 }
1830
1831 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1832 {
1833         u8 tid;
1834
1835         if (!aggr_conn)
1836                 return;
1837
1838         if (aggr_conn->timer_scheduled) {
1839                 del_timer(&aggr_conn->timer);
1840                 aggr_conn->timer_scheduled = false;
1841         }
1842
1843         for (tid = 0; tid < NUM_OF_TIDS; tid++)
1844                 aggr_delete_tid_state(aggr_conn, tid);
1845 }
1846
1847 /* clean up our amsdu buffer list */
1848 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1849 {
1850         struct htc_packet *packet, *tmp_pkt;
1851
1852         spin_lock_bh(&ar->lock);
1853         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1854                 spin_unlock_bh(&ar->lock);
1855                 return;
1856         }
1857
1858         list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1859                                  list) {
1860                 list_del(&packet->list);
1861                 spin_unlock_bh(&ar->lock);
1862                 dev_kfree_skb(packet->pkt_cntxt);
1863                 spin_lock_bh(&ar->lock);
1864         }
1865
1866         spin_unlock_bh(&ar->lock);
1867 }
1868
1869 void aggr_module_destroy(struct aggr_info *aggr_info)
1870 {
1871         if (!aggr_info)
1872                 return;
1873
1874         aggr_reset_state(aggr_info->aggr_conn);
1875         skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1876         kfree(aggr_info->aggr_conn);
1877         kfree(aggr_info);
1878 }