Merge ath-next from git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git
[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_cow_head(skb, dev->needed_headroom)) {
403                         dev->stats.tx_dropped++;
404                         kfree_skb(skb);
405                         return 0;
406                 }
407
408                 if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) {
409                         ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n");
410                         goto fail_tx;
411                 }
412
413                 if ((dev->features & NETIF_F_IP_CSUM) &&
414                     (csum == CHECKSUM_PARTIAL)) {
415                         meta_v2.csum_start = csum_start;
416                         meta_v2.csum_dest = csum_dest;
417
418                         /* instruct target to calculate checksum */
419                         meta_v2.csum_flags = WMI_META_V2_FLAG_CSUM_OFFLOAD;
420                         meta_ver = WMI_META_VERSION_2;
421                         meta = &meta_v2;
422                 } else {
423                         meta_ver = 0;
424                         meta = NULL;
425                 }
426
427                 ret = ath6kl_wmi_data_hdr_add(ar->wmi, skb,
428                                 DATA_MSGTYPE, flags, 0,
429                                 meta_ver,
430                                 meta, vif->fw_vif_idx);
431
432                 if (ret) {
433                         ath6kl_warn("failed to add wmi data header:%d\n"
434                                 , ret);
435                         goto fail_tx;
436                 }
437
438                 if ((vif->nw_type == ADHOC_NETWORK) &&
439                     ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags))
440                         chk_adhoc_ps_mapping = true;
441                 else {
442                         /* get the stream mapping */
443                         ret = ath6kl_wmi_implicit_create_pstream(ar->wmi,
444                                     vif->fw_vif_idx, skb,
445                                     0, test_bit(WMM_ENABLED, &vif->flags), &ac);
446                         if (ret)
447                                 goto fail_tx;
448                 }
449         } else {
450                 goto fail_tx;
451         }
452
453         spin_lock_bh(&ar->lock);
454
455         if (chk_adhoc_ps_mapping)
456                 eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
457         else
458                 eid = ar->ac2ep_map[ac];
459
460         if (eid == 0 || eid == ENDPOINT_UNUSED) {
461                 ath6kl_err("eid %d is not mapped!\n", eid);
462                 spin_unlock_bh(&ar->lock);
463                 goto fail_tx;
464         }
465
466         /* allocate resource for this packet */
467         cookie = ath6kl_alloc_cookie(ar);
468
469         if (!cookie) {
470                 spin_unlock_bh(&ar->lock);
471                 goto fail_tx;
472         }
473
474         /* update counts while the lock is held */
475         ar->tx_pending[eid]++;
476         ar->total_tx_data_pend++;
477
478         spin_unlock_bh(&ar->lock);
479
480         if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
481             skb_cloned(skb)) {
482                 /*
483                  * We will touch (move the buffer data to align it. Since the
484                  * skb buffer is cloned and not only the header is changed, we
485                  * have to copy it to allow the changes. Since we are copying
486                  * the data here, we may as well align it by reserving suitable
487                  * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
488                  */
489                 struct sk_buff *nskb;
490
491                 nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
492                 if (nskb == NULL)
493                         goto fail_tx;
494                 kfree_skb(skb);
495                 skb = nskb;
496         }
497
498         cookie->skb = skb;
499         cookie->map_no = map_no;
500         set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
501                          eid, htc_tag);
502         cookie->htc_pkt.skb = skb;
503
504         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
505                         skb->data, skb->len);
506
507         /*
508          * HTC interface is asynchronous, if this fails, cleanup will
509          * happen in the ath6kl_tx_complete callback.
510          */
511         ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
512
513         return 0;
514
515 fail_tx:
516         dev_kfree_skb(skb);
517
518         dev->stats.tx_dropped++;
519         dev->stats.tx_aborted_errors++;
520
521         return 0;
522 }
523
524 /* indicate tx activity or inactivity on a WMI stream */
525 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
526 {
527         struct ath6kl *ar = devt;
528         enum htc_endpoint_id eid;
529         int i;
530
531         eid = ar->ac2ep_map[traffic_class];
532
533         if (!test_bit(WMI_ENABLED, &ar->flag))
534                 goto notify_htc;
535
536         spin_lock_bh(&ar->lock);
537
538         ar->ac_stream_active[traffic_class] = active;
539
540         if (active) {
541                 /*
542                  * Keep track of the active stream with the highest
543                  * priority.
544                  */
545                 if (ar->ac_stream_pri_map[traffic_class] >
546                     ar->hiac_stream_active_pri)
547                         /* set the new highest active priority */
548                         ar->hiac_stream_active_pri =
549                                         ar->ac_stream_pri_map[traffic_class];
550
551         } else {
552                 /*
553                  * We may have to search for the next active stream
554                  * that is the highest priority.
555                  */
556                 if (ar->hiac_stream_active_pri ==
557                         ar->ac_stream_pri_map[traffic_class]) {
558                         /*
559                          * The highest priority stream just went inactive
560                          * reset and search for the "next" highest "active"
561                          * priority stream.
562                          */
563                         ar->hiac_stream_active_pri = 0;
564
565                         for (i = 0; i < WMM_NUM_AC; i++) {
566                                 if (ar->ac_stream_active[i] &&
567                                     (ar->ac_stream_pri_map[i] >
568                                      ar->hiac_stream_active_pri))
569                                         /*
570                                          * Set the new highest active
571                                          * priority.
572                                          */
573                                         ar->hiac_stream_active_pri =
574                                                 ar->ac_stream_pri_map[i];
575                         }
576                 }
577         }
578
579         spin_unlock_bh(&ar->lock);
580
581 notify_htc:
582         /* notify HTC, this may cause credit distribution changes */
583         ath6kl_htc_activity_changed(ar->htc_target, eid, active);
584 }
585
586 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
587                                                struct htc_packet *packet)
588 {
589         struct ath6kl *ar = target->dev->ar;
590         struct ath6kl_vif *vif;
591         enum htc_endpoint_id endpoint = packet->endpoint;
592         enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
593
594         if (endpoint == ar->ctrl_ep) {
595                 /*
596                  * Under normal WMI if this is getting full, then something
597                  * is running rampant the host should not be exhausting the
598                  * WMI queue with too many commands the only exception to
599                  * this is during testing using endpointping.
600                  */
601                 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
602                 ath6kl_err("wmi ctrl ep is full\n");
603                 ath6kl_recovery_err_notify(ar, ATH6KL_FW_EP_FULL);
604                 return action;
605         }
606
607         if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
608                 return action;
609
610         /*
611          * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
612          * the highest active stream.
613          */
614         if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
615             ar->hiac_stream_active_pri &&
616             ar->cookie_count <=
617                         target->endpoint[endpoint].tx_drop_packet_threshold)
618                 /*
619                  * Give preference to the highest priority stream by
620                  * dropping the packets which overflowed.
621                  */
622                 action = HTC_SEND_FULL_DROP;
623
624         /* FIXME: Locking */
625         spin_lock_bh(&ar->list_lock);
626         list_for_each_entry(vif, &ar->vif_list, list) {
627                 if (vif->nw_type == ADHOC_NETWORK ||
628                     action != HTC_SEND_FULL_DROP) {
629                         spin_unlock_bh(&ar->list_lock);
630
631                         set_bit(NETQ_STOPPED, &vif->flags);
632                         netif_stop_queue(vif->ndev);
633
634                         return action;
635                 }
636         }
637         spin_unlock_bh(&ar->list_lock);
638
639         return action;
640 }
641
642 /* TODO this needs to be looked at */
643 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
644                                      enum htc_endpoint_id eid, u32 map_no)
645 {
646         struct ath6kl *ar = vif->ar;
647         u32 i;
648
649         if (vif->nw_type != ADHOC_NETWORK)
650                 return;
651
652         if (!ar->ibss_ps_enable)
653                 return;
654
655         if (eid == ar->ctrl_ep)
656                 return;
657
658         if (map_no == 0)
659                 return;
660
661         map_no--;
662         ar->node_map[map_no].tx_pend--;
663
664         if (ar->node_map[map_no].tx_pend)
665                 return;
666
667         if (map_no != (ar->node_num - 1))
668                 return;
669
670         for (i = ar->node_num; i > 0; i--) {
671                 if (ar->node_map[i - 1].tx_pend)
672                         break;
673
674                 memset(&ar->node_map[i - 1], 0,
675                        sizeof(struct ath6kl_node_mapping));
676                 ar->node_num--;
677         }
678 }
679
680 void ath6kl_tx_complete(struct htc_target *target,
681                         struct list_head *packet_queue)
682 {
683         struct ath6kl *ar = target->dev->ar;
684         struct sk_buff_head skb_queue;
685         struct htc_packet *packet;
686         struct sk_buff *skb;
687         struct ath6kl_cookie *ath6kl_cookie;
688         u32 map_no = 0;
689         int status;
690         enum htc_endpoint_id eid;
691         bool wake_event = false;
692         bool flushing[ATH6KL_VIF_MAX] = {false};
693         u8 if_idx;
694         struct ath6kl_vif *vif;
695
696         skb_queue_head_init(&skb_queue);
697
698         /* lock the driver as we update internal state */
699         spin_lock_bh(&ar->lock);
700
701         /* reap completed packets */
702         while (!list_empty(packet_queue)) {
703                 packet = list_first_entry(packet_queue, struct htc_packet,
704                                           list);
705                 list_del(&packet->list);
706
707                 if (WARN_ON_ONCE(packet->endpoint == ENDPOINT_UNUSED ||
708                                  packet->endpoint >= ENDPOINT_MAX))
709                         continue;
710
711                 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
712                 if (WARN_ON_ONCE(!ath6kl_cookie))
713                         continue;
714
715                 status = packet->status;
716                 skb = ath6kl_cookie->skb;
717                 eid = packet->endpoint;
718                 map_no = ath6kl_cookie->map_no;
719
720                 if (WARN_ON_ONCE(!skb || !skb->data)) {
721                         dev_kfree_skb(skb);
722                         ath6kl_free_cookie(ar, ath6kl_cookie);
723                         continue;
724                 }
725
726                 __skb_queue_tail(&skb_queue, skb);
727
728                 if (WARN_ON_ONCE(!status && (packet->act_len != skb->len))) {
729                         ath6kl_free_cookie(ar, ath6kl_cookie);
730                         continue;
731                 }
732
733                 ar->tx_pending[eid]--;
734
735                 if (eid != ar->ctrl_ep)
736                         ar->total_tx_data_pend--;
737
738                 if (eid == ar->ctrl_ep) {
739                         if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
740                                 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
741
742                         if (ar->tx_pending[eid] == 0)
743                                 wake_event = true;
744                 }
745
746                 if (eid == ar->ctrl_ep) {
747                         if_idx = wmi_cmd_hdr_get_if_idx(
748                                 (struct wmi_cmd_hdr *) packet->buf);
749                 } else {
750                         if_idx = wmi_data_hdr_get_if_idx(
751                                 (struct wmi_data_hdr *) packet->buf);
752                 }
753
754                 vif = ath6kl_get_vif_by_index(ar, if_idx);
755                 if (!vif) {
756                         ath6kl_free_cookie(ar, ath6kl_cookie);
757                         continue;
758                 }
759
760                 if (status) {
761                         if (status == -ECANCELED)
762                                 /* a packet was flushed  */
763                                 flushing[if_idx] = true;
764
765                         vif->ndev->stats.tx_errors++;
766
767                         if (status != -ENOSPC && status != -ECANCELED)
768                                 ath6kl_warn("tx complete error: %d\n", status);
769
770                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
771                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
772                                    __func__, skb, packet->buf, packet->act_len,
773                                    eid, "error!");
774                 } else {
775                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
776                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
777                                    __func__, skb, packet->buf, packet->act_len,
778                                    eid, "OK");
779
780                         flushing[if_idx] = false;
781                         vif->ndev->stats.tx_packets++;
782                         vif->ndev->stats.tx_bytes += skb->len;
783                 }
784
785                 ath6kl_tx_clear_node_map(vif, eid, map_no);
786
787                 ath6kl_free_cookie(ar, ath6kl_cookie);
788
789                 if (test_bit(NETQ_STOPPED, &vif->flags))
790                         clear_bit(NETQ_STOPPED, &vif->flags);
791         }
792
793         spin_unlock_bh(&ar->lock);
794
795         __skb_queue_purge(&skb_queue);
796
797         /* FIXME: Locking */
798         spin_lock_bh(&ar->list_lock);
799         list_for_each_entry(vif, &ar->vif_list, list) {
800                 if (test_bit(CONNECTED, &vif->flags) &&
801                     !flushing[vif->fw_vif_idx]) {
802                         spin_unlock_bh(&ar->list_lock);
803                         netif_wake_queue(vif->ndev);
804                         spin_lock_bh(&ar->list_lock);
805                 }
806         }
807         spin_unlock_bh(&ar->list_lock);
808
809         if (wake_event)
810                 wake_up(&ar->event_wq);
811
812         return;
813 }
814
815 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
816 {
817         int i;
818
819         /* flush all the data (non-control) streams */
820         for (i = 0; i < WMM_NUM_AC; i++)
821                 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
822                                       ATH6KL_DATA_PKT_TAG);
823 }
824
825 /* Rx functions */
826
827 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
828                                               struct sk_buff *skb)
829 {
830         if (!skb)
831                 return;
832
833         skb->dev = dev;
834
835         if (!(skb->dev->flags & IFF_UP)) {
836                 dev_kfree_skb(skb);
837                 return;
838         }
839
840         skb->protocol = eth_type_trans(skb, skb->dev);
841
842         netif_rx_ni(skb);
843 }
844
845 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
846 {
847         struct sk_buff *skb;
848
849         while (num) {
850                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
851                 if (!skb) {
852                         ath6kl_err("netbuf allocation failed\n");
853                         return;
854                 }
855                 skb_queue_tail(q, skb);
856                 num--;
857         }
858 }
859
860 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
861 {
862         struct sk_buff *skb = NULL;
863
864         if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
865             (AGGR_NUM_OF_FREE_NETBUFS >> 2))
866                 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
867                                      AGGR_NUM_OF_FREE_NETBUFS);
868
869         skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
870
871         return skb;
872 }
873
874 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
875 {
876         struct ath6kl *ar = target->dev->ar;
877         struct sk_buff *skb;
878         int rx_buf;
879         int n_buf_refill;
880         struct htc_packet *packet;
881         struct list_head queue;
882
883         n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
884                           ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
885
886         if (n_buf_refill <= 0)
887                 return;
888
889         INIT_LIST_HEAD(&queue);
890
891         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
892                    "%s: providing htc with %d buffers at eid=%d\n",
893                    __func__, n_buf_refill, endpoint);
894
895         for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
896                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
897                 if (!skb)
898                         break;
899
900                 packet = (struct htc_packet *) skb->head;
901                 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
902                         size_t len = skb_headlen(skb);
903                         skb->data = PTR_ALIGN(skb->data - 4, 4);
904                         skb_set_tail_pointer(skb, len);
905                 }
906                 set_htc_rxpkt_info(packet, skb, skb->data,
907                                    ATH6KL_BUFFER_SIZE, endpoint);
908                 packet->skb = skb;
909                 list_add_tail(&packet->list, &queue);
910         }
911
912         if (!list_empty(&queue))
913                 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
914 }
915
916 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
917 {
918         struct htc_packet *packet;
919         struct sk_buff *skb;
920
921         while (count) {
922                 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
923                 if (!skb)
924                         return;
925
926                 packet = (struct htc_packet *) skb->head;
927                 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
928                         size_t len = skb_headlen(skb);
929                         skb->data = PTR_ALIGN(skb->data - 4, 4);
930                         skb_set_tail_pointer(skb, len);
931                 }
932                 set_htc_rxpkt_info(packet, skb, skb->data,
933                                    ATH6KL_AMSDU_BUFFER_SIZE, 0);
934                 packet->skb = skb;
935
936                 spin_lock_bh(&ar->lock);
937                 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
938                 spin_unlock_bh(&ar->lock);
939                 count--;
940         }
941 }
942
943 /*
944  * Callback to allocate a receive buffer for a pending packet. We use a
945  * pre-allocated list of buffers of maximum AMSDU size (4K).
946  */
947 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
948                                             enum htc_endpoint_id endpoint,
949                                             int len)
950 {
951         struct ath6kl *ar = target->dev->ar;
952         struct htc_packet *packet = NULL;
953         struct list_head *pkt_pos;
954         int refill_cnt = 0, depth = 0;
955
956         ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
957                    __func__, endpoint, len);
958
959         if ((len <= ATH6KL_BUFFER_SIZE) ||
960             (len > ATH6KL_AMSDU_BUFFER_SIZE))
961                 return NULL;
962
963         spin_lock_bh(&ar->lock);
964
965         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
966                 spin_unlock_bh(&ar->lock);
967                 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
968                 goto refill_buf;
969         }
970
971         packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
972                                   struct htc_packet, list);
973         list_del(&packet->list);
974         list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
975                 depth++;
976
977         refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
978         spin_unlock_bh(&ar->lock);
979
980         /* set actual endpoint ID */
981         packet->endpoint = endpoint;
982
983 refill_buf:
984         if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
985                 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
986
987         return packet;
988 }
989
990 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
991                              struct rxtid *rxtid, struct sk_buff *skb)
992 {
993         struct sk_buff *new_skb;
994         struct ethhdr *hdr;
995         u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
996         u8 *framep;
997
998         mac_hdr_len = sizeof(struct ethhdr);
999         framep = skb->data + mac_hdr_len;
1000         amsdu_len = skb->len - mac_hdr_len;
1001
1002         while (amsdu_len > mac_hdr_len) {
1003                 hdr = (struct ethhdr *) framep;
1004                 payload_8023_len = ntohs(hdr->h_proto);
1005
1006                 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
1007                     payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
1008                         ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
1009                                    payload_8023_len);
1010                         break;
1011                 }
1012
1013                 frame_8023_len = payload_8023_len + mac_hdr_len;
1014                 new_skb = aggr_get_free_skb(p_aggr);
1015                 if (!new_skb) {
1016                         ath6kl_err("no buffer available\n");
1017                         break;
1018                 }
1019
1020                 memcpy(new_skb->data, framep, frame_8023_len);
1021                 skb_put(new_skb, frame_8023_len);
1022                 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
1023                         ath6kl_err("dot3_2_dix error\n");
1024                         dev_kfree_skb(new_skb);
1025                         break;
1026                 }
1027
1028                 skb_queue_tail(&rxtid->q, new_skb);
1029
1030                 /* Is this the last subframe within this aggregate ? */
1031                 if ((amsdu_len - frame_8023_len) == 0)
1032                         break;
1033
1034                 /* Add the length of A-MSDU subframe padding bytes -
1035                  * Round to nearest word.
1036                  */
1037                 frame_8023_len = ALIGN(frame_8023_len, 4);
1038
1039                 framep += frame_8023_len;
1040                 amsdu_len -= frame_8023_len;
1041         }
1042
1043         dev_kfree_skb(skb);
1044 }
1045
1046 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1047                             u16 seq_no, u8 order)
1048 {
1049         struct sk_buff *skb;
1050         struct rxtid *rxtid;
1051         struct skb_hold_q *node;
1052         u16 idx, idx_end, seq_end;
1053         struct rxtid_stats *stats;
1054
1055         rxtid = &agg_conn->rx_tid[tid];
1056         stats = &agg_conn->stat[tid];
1057
1058         spin_lock_bh(&rxtid->lock);
1059         idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1060
1061         /*
1062          * idx_end is typically the last possible frame in the window,
1063          * but changes to 'the' seq_no, when BAR comes. If seq_no
1064          * is non-zero, we will go up to that and stop.
1065          * Note: last seq no in current window will occupy the same
1066          * index position as index that is just previous to start.
1067          * An imp point : if win_sz is 7, for seq_no space of 4095,
1068          * then, there would be holes when sequence wrap around occurs.
1069          * Target should judiciously choose the win_sz, based on
1070          * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1071          * 2, 4, 8, 16 win_sz works fine).
1072          * We must deque from "idx" to "idx_end", including both.
1073          */
1074         seq_end = seq_no ? seq_no : rxtid->seq_next;
1075         idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1076
1077         do {
1078                 node = &rxtid->hold_q[idx];
1079                 if ((order == 1) && (!node->skb))
1080                         break;
1081
1082                 if (node->skb) {
1083                         if (node->is_amsdu)
1084                                 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1085                                                  node->skb);
1086                         else
1087                                 skb_queue_tail(&rxtid->q, node->skb);
1088                         node->skb = NULL;
1089                 } else {
1090                         stats->num_hole++;
1091                 }
1092
1093                 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1094                 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1095         } while (idx != idx_end);
1096
1097         spin_unlock_bh(&rxtid->lock);
1098
1099         stats->num_delivered += skb_queue_len(&rxtid->q);
1100
1101         while ((skb = skb_dequeue(&rxtid->q)))
1102                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1103 }
1104
1105 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1106                                   u16 seq_no,
1107                                   bool is_amsdu, struct sk_buff *frame)
1108 {
1109         struct rxtid *rxtid;
1110         struct rxtid_stats *stats;
1111         struct sk_buff *skb;
1112         struct skb_hold_q *node;
1113         u16 idx, st, cur, end;
1114         bool is_queued = false;
1115         u16 extended_end;
1116
1117         rxtid = &agg_conn->rx_tid[tid];
1118         stats = &agg_conn->stat[tid];
1119
1120         stats->num_into_aggr++;
1121
1122         if (!rxtid->aggr) {
1123                 if (is_amsdu) {
1124                         aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1125                         is_queued = true;
1126                         stats->num_amsdu++;
1127                         while ((skb = skb_dequeue(&rxtid->q)))
1128                                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1129                                                                   skb);
1130                 }
1131                 return is_queued;
1132         }
1133
1134         /* Check the incoming sequence no, if it's in the window */
1135         st = rxtid->seq_next;
1136         cur = seq_no;
1137         end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1138
1139         if (((st < end) && (cur < st || cur > end)) ||
1140             ((st > end) && (cur > end) && (cur < st))) {
1141                 extended_end = (end + rxtid->hold_q_sz - 1) &
1142                         ATH6KL_MAX_SEQ_NO;
1143
1144                 if (((end < extended_end) &&
1145                      (cur < end || cur > extended_end)) ||
1146                     ((end > extended_end) && (cur > extended_end) &&
1147                      (cur < end))) {
1148                         aggr_deque_frms(agg_conn, tid, 0, 0);
1149                         spin_lock_bh(&rxtid->lock);
1150                         if (cur >= rxtid->hold_q_sz - 1)
1151                                 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1152                         else
1153                                 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1154                                                   (rxtid->hold_q_sz - 2 - cur);
1155                         spin_unlock_bh(&rxtid->lock);
1156                 } else {
1157                         /*
1158                          * Dequeue only those frames that are outside the
1159                          * new shifted window.
1160                          */
1161                         if (cur >= rxtid->hold_q_sz - 1)
1162                                 st = cur - (rxtid->hold_q_sz - 1);
1163                         else
1164                                 st = ATH6KL_MAX_SEQ_NO -
1165                                         (rxtid->hold_q_sz - 2 - cur);
1166
1167                         aggr_deque_frms(agg_conn, tid, st, 0);
1168                 }
1169
1170                 stats->num_oow++;
1171         }
1172
1173         idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1174
1175         node = &rxtid->hold_q[idx];
1176
1177         spin_lock_bh(&rxtid->lock);
1178
1179         /*
1180          * Is the cur frame duplicate or something beyond our window(hold_q
1181          * -> which is 2x, already)?
1182          *
1183          * 1. Duplicate is easy - drop incoming frame.
1184          * 2. Not falling in current sliding window.
1185          *  2a. is the frame_seq_no preceding current tid_seq_no?
1186          *      -> drop the frame. perhaps sender did not get our ACK.
1187          *         this is taken care of above.
1188          *  2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1189          *      -> Taken care of it above, by moving window forward.
1190          */
1191         dev_kfree_skb(node->skb);
1192         stats->num_dups++;
1193
1194         node->skb = frame;
1195         is_queued = true;
1196         node->is_amsdu = is_amsdu;
1197         node->seq_no = seq_no;
1198
1199         if (node->is_amsdu)
1200                 stats->num_amsdu++;
1201         else
1202                 stats->num_mpdu++;
1203
1204         spin_unlock_bh(&rxtid->lock);
1205
1206         aggr_deque_frms(agg_conn, tid, 0, 1);
1207
1208         if (agg_conn->timer_scheduled)
1209                 return is_queued;
1210
1211         spin_lock_bh(&rxtid->lock);
1212         for (idx = 0; idx < rxtid->hold_q_sz; idx++) {
1213                 if (rxtid->hold_q[idx].skb) {
1214                         /*
1215                          * There is a frame in the queue and no
1216                          * timer so start a timer to ensure that
1217                          * the frame doesn't remain stuck
1218                          * forever.
1219                          */
1220                         agg_conn->timer_scheduled = true;
1221                         mod_timer(&agg_conn->timer,
1222                                   (jiffies + (HZ * AGGR_RX_TIMEOUT) / 1000));
1223                         rxtid->timer_mon = true;
1224                         break;
1225                 }
1226         }
1227         spin_unlock_bh(&rxtid->lock);
1228
1229         return is_queued;
1230 }
1231
1232 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1233                                                  struct ath6kl_sta *conn)
1234 {
1235         struct ath6kl *ar = vif->ar;
1236         bool is_apsdq_empty, is_apsdq_empty_at_start;
1237         u32 num_frames_to_deliver, flags;
1238         struct sk_buff *skb = NULL;
1239
1240         /*
1241          * If the APSD q for this STA is not empty, dequeue and
1242          * send a pkt from the head of the q. Also update the
1243          * More data bit in the WMI_DATA_HDR if there are
1244          * more pkts for this STA in the APSD q.
1245          * If there are no more pkts for this STA,
1246          * update the APSD bitmap for this STA.
1247          */
1248
1249         num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1250                                                     ATH6KL_APSD_FRAME_MASK;
1251         /*
1252          * Number of frames to send in a service period is
1253          * indicated by the station
1254          * in the QOS_INFO of the association request
1255          * If it is zero, send all frames
1256          */
1257         if (!num_frames_to_deliver)
1258                 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1259
1260         spin_lock_bh(&conn->psq_lock);
1261         is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1262         spin_unlock_bh(&conn->psq_lock);
1263         is_apsdq_empty_at_start = is_apsdq_empty;
1264
1265         while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1266                 spin_lock_bh(&conn->psq_lock);
1267                 skb = skb_dequeue(&conn->apsdq);
1268                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1269                 spin_unlock_bh(&conn->psq_lock);
1270
1271                 /*
1272                  * Set the STA flag to Trigger delivery,
1273                  * so that the frame will go out
1274                  */
1275                 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1276                 num_frames_to_deliver--;
1277
1278                 /* Last frame in the service period, set EOSP or queue empty */
1279                 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1280                         conn->sta_flags |= STA_PS_APSD_EOSP;
1281
1282                 ath6kl_data_tx(skb, vif->ndev);
1283                 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1284                 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1285         }
1286
1287         if (is_apsdq_empty) {
1288                 if (is_apsdq_empty_at_start)
1289                         flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1290                 else
1291                         flags = 0;
1292
1293                 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1294                                               vif->fw_vif_idx,
1295                                               conn->aid, 0, flags);
1296         }
1297
1298         return;
1299 }
1300
1301 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1302 {
1303         struct ath6kl *ar = target->dev->ar;
1304         struct sk_buff *skb = packet->pkt_cntxt;
1305         struct wmi_rx_meta_v2 *meta;
1306         struct wmi_data_hdr *dhdr;
1307         int min_hdr_len;
1308         u8 meta_type, dot11_hdr = 0;
1309         u8 pad_before_data_start;
1310         int status = packet->status;
1311         enum htc_endpoint_id ept = packet->endpoint;
1312         bool is_amsdu, prev_ps, ps_state = false;
1313         bool trig_state = false;
1314         struct ath6kl_sta *conn = NULL;
1315         struct sk_buff *skb1 = NULL;
1316         struct ethhdr *datap = NULL;
1317         struct ath6kl_vif *vif;
1318         struct aggr_info_conn *aggr_conn;
1319         u16 seq_no, offset;
1320         u8 tid, if_idx;
1321
1322         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1323                    "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1324                    __func__, ar, ept, skb, packet->buf,
1325                    packet->act_len, status);
1326
1327         if (status || packet->act_len < HTC_HDR_LENGTH) {
1328                 dev_kfree_skb(skb);
1329                 return;
1330         }
1331
1332         skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1333         skb_pull(skb, HTC_HDR_LENGTH);
1334
1335         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1336                         skb->data, skb->len);
1337
1338         if (ept == ar->ctrl_ep) {
1339                 if (test_bit(WMI_ENABLED, &ar->flag)) {
1340                         ath6kl_check_wow_status(ar);
1341                         ath6kl_wmi_control_rx(ar->wmi, skb);
1342                         return;
1343                 }
1344                 if_idx =
1345                 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1346         } else {
1347                 if_idx =
1348                 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1349         }
1350
1351         vif = ath6kl_get_vif_by_index(ar, if_idx);
1352         if (!vif) {
1353                 dev_kfree_skb(skb);
1354                 return;
1355         }
1356
1357         /*
1358          * Take lock to protect buffer counts and adaptive power throughput
1359          * state.
1360          */
1361         spin_lock_bh(&vif->if_lock);
1362
1363         vif->ndev->stats.rx_packets++;
1364         vif->ndev->stats.rx_bytes += packet->act_len;
1365
1366         spin_unlock_bh(&vif->if_lock);
1367
1368         skb->dev = vif->ndev;
1369
1370         if (!test_bit(WMI_ENABLED, &ar->flag)) {
1371                 if (EPPING_ALIGNMENT_PAD > 0)
1372                         skb_pull(skb, EPPING_ALIGNMENT_PAD);
1373                 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1374                 return;
1375         }
1376
1377         ath6kl_check_wow_status(ar);
1378
1379         min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1380                       sizeof(struct ath6kl_llc_snap_hdr);
1381
1382         dhdr = (struct wmi_data_hdr *) skb->data;
1383
1384         /*
1385          * In the case of AP mode we may receive NULL data frames
1386          * that do not have LLC hdr. They are 16 bytes in size.
1387          * Allow these frames in the AP mode.
1388          */
1389         if (vif->nw_type != AP_NETWORK &&
1390             ((packet->act_len < min_hdr_len) ||
1391              (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1392                 ath6kl_info("frame len is too short or too long\n");
1393                 vif->ndev->stats.rx_errors++;
1394                 vif->ndev->stats.rx_length_errors++;
1395                 dev_kfree_skb(skb);
1396                 return;
1397         }
1398
1399         pad_before_data_start =
1400                 (le16_to_cpu(dhdr->info3) >> WMI_DATA_HDR_PAD_BEFORE_DATA_SHIFT)
1401                         & WMI_DATA_HDR_PAD_BEFORE_DATA_MASK;
1402
1403         /* Get the Power save state of the STA */
1404         if (vif->nw_type == AP_NETWORK) {
1405                 meta_type = wmi_data_hdr_get_meta(dhdr);
1406
1407                 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1408                               WMI_DATA_HDR_PS_MASK);
1409
1410                 offset = sizeof(struct wmi_data_hdr) + pad_before_data_start;
1411                 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1412
1413                 switch (meta_type) {
1414                 case 0:
1415                         break;
1416                 case WMI_META_VERSION_1:
1417                         offset += sizeof(struct wmi_rx_meta_v1);
1418                         break;
1419                 case WMI_META_VERSION_2:
1420                         offset += sizeof(struct wmi_rx_meta_v2);
1421                         break;
1422                 default:
1423                         break;
1424                 }
1425
1426                 datap = (struct ethhdr *) (skb->data + offset);
1427                 conn = ath6kl_find_sta(vif, datap->h_source);
1428
1429                 if (!conn) {
1430                         dev_kfree_skb(skb);
1431                         return;
1432                 }
1433
1434                 /*
1435                  * If there is a change in PS state of the STA,
1436                  * take appropriate steps:
1437                  *
1438                  * 1. If Sleep-->Awake, flush the psq for the STA
1439                  *    Clear the PVB for the STA.
1440                  * 2. If Awake-->Sleep, Starting queueing frames
1441                  *    the STA.
1442                  */
1443                 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1444
1445                 if (ps_state)
1446                         conn->sta_flags |= STA_PS_SLEEP;
1447                 else
1448                         conn->sta_flags &= ~STA_PS_SLEEP;
1449
1450                 /* Accept trigger only when the station is in sleep */
1451                 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1452                         ath6kl_uapsd_trigger_frame_rx(vif, conn);
1453
1454                 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1455                         if (!(conn->sta_flags & STA_PS_SLEEP)) {
1456                                 struct sk_buff *skbuff = NULL;
1457                                 bool is_apsdq_empty;
1458                                 struct ath6kl_mgmt_buff *mgmt;
1459                                 u8 idx;
1460
1461                                 spin_lock_bh(&conn->psq_lock);
1462                                 while (conn->mgmt_psq_len > 0) {
1463                                         mgmt = list_first_entry(
1464                                                         &conn->mgmt_psq,
1465                                                         struct ath6kl_mgmt_buff,
1466                                                         list);
1467                                         list_del(&mgmt->list);
1468                                         conn->mgmt_psq_len--;
1469                                         spin_unlock_bh(&conn->psq_lock);
1470                                         idx = vif->fw_vif_idx;
1471
1472                                         ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1473                                                                  idx,
1474                                                                  mgmt->id,
1475                                                                  mgmt->freq,
1476                                                                  mgmt->wait,
1477                                                                  mgmt->buf,
1478                                                                  mgmt->len,
1479                                                                  mgmt->no_cck);
1480
1481                                         kfree(mgmt);
1482                                         spin_lock_bh(&conn->psq_lock);
1483                                 }
1484                                 conn->mgmt_psq_len = 0;
1485                                 while ((skbuff = skb_dequeue(&conn->psq))) {
1486                                         spin_unlock_bh(&conn->psq_lock);
1487                                         ath6kl_data_tx(skbuff, vif->ndev);
1488                                         spin_lock_bh(&conn->psq_lock);
1489                                 }
1490
1491                                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1492                                 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1493                                         spin_unlock_bh(&conn->psq_lock);
1494                                         ath6kl_data_tx(skbuff, vif->ndev);
1495                                         spin_lock_bh(&conn->psq_lock);
1496                                 }
1497                                 spin_unlock_bh(&conn->psq_lock);
1498
1499                                 if (!is_apsdq_empty)
1500                                         ath6kl_wmi_set_apsd_bfrd_traf(
1501                                                         ar->wmi,
1502                                                         vif->fw_vif_idx,
1503                                                         conn->aid, 0, 0);
1504
1505                                 /* Clear the PVB for this STA */
1506                                 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1507                                                        conn->aid, 0);
1508                         }
1509                 }
1510
1511                 /* drop NULL data frames here */
1512                 if ((packet->act_len < min_hdr_len) ||
1513                     (packet->act_len >
1514                      WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1515                         dev_kfree_skb(skb);
1516                         return;
1517                 }
1518         }
1519
1520         is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1521         tid = wmi_data_hdr_get_up(dhdr);
1522         seq_no = wmi_data_hdr_get_seqno(dhdr);
1523         meta_type = wmi_data_hdr_get_meta(dhdr);
1524         dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1525
1526         skb_pull(skb, sizeof(struct wmi_data_hdr));
1527
1528         switch (meta_type) {
1529         case WMI_META_VERSION_1:
1530                 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1531                 break;
1532         case WMI_META_VERSION_2:
1533                 meta = (struct wmi_rx_meta_v2 *) skb->data;
1534                 if (meta->csum_flags & 0x1) {
1535                         skb->ip_summed = CHECKSUM_COMPLETE;
1536                         skb->csum = (__force __wsum) meta->csum;
1537                 }
1538                 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1539                 break;
1540         default:
1541                 break;
1542         }
1543
1544         skb_pull(skb, pad_before_data_start);
1545
1546         if (dot11_hdr)
1547                 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1548         else if (!is_amsdu)
1549                 status = ath6kl_wmi_dot3_2_dix(skb);
1550
1551         if (status) {
1552                 /*
1553                  * Drop frames that could not be processed (lack of
1554                  * memory, etc.)
1555                  */
1556                 dev_kfree_skb(skb);
1557                 return;
1558         }
1559
1560         if (!(vif->ndev->flags & IFF_UP)) {
1561                 dev_kfree_skb(skb);
1562                 return;
1563         }
1564
1565         if (vif->nw_type == AP_NETWORK) {
1566                 datap = (struct ethhdr *) skb->data;
1567                 if (is_multicast_ether_addr(datap->h_dest))
1568                         /*
1569                          * Bcast/Mcast frames should be sent to the
1570                          * OS stack as well as on the air.
1571                          */
1572                         skb1 = skb_copy(skb, GFP_ATOMIC);
1573                 else {
1574                         /*
1575                          * Search for a connected STA with dstMac
1576                          * as the Mac address. If found send the
1577                          * frame to it on the air else send the
1578                          * frame up the stack.
1579                          */
1580                         conn = ath6kl_find_sta(vif, datap->h_dest);
1581
1582                         if (conn && ar->intra_bss) {
1583                                 skb1 = skb;
1584                                 skb = NULL;
1585                         } else if (conn && !ar->intra_bss) {
1586                                 dev_kfree_skb(skb);
1587                                 skb = NULL;
1588                         }
1589                 }
1590                 if (skb1)
1591                         ath6kl_data_tx(skb1, vif->ndev);
1592
1593                 if (skb == NULL) {
1594                         /* nothing to deliver up the stack */
1595                         return;
1596                 }
1597         }
1598
1599         datap = (struct ethhdr *) skb->data;
1600
1601         if (is_unicast_ether_addr(datap->h_dest)) {
1602                 if (vif->nw_type == AP_NETWORK) {
1603                         conn = ath6kl_find_sta(vif, datap->h_source);
1604                         if (!conn)
1605                                 return;
1606                         aggr_conn = conn->aggr_conn;
1607                 } else {
1608                         aggr_conn = vif->aggr_cntxt->aggr_conn;
1609                 }
1610
1611                 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1612                                           is_amsdu, skb)) {
1613                         /* aggregation code will handle the skb */
1614                         return;
1615                 }
1616         } else if (!is_broadcast_ether_addr(datap->h_dest)) {
1617                 vif->ndev->stats.multicast++;
1618         }
1619
1620         ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1621 }
1622
1623 static void aggr_timeout(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
1717         if (!aggr_conn)
1718                 return;
1719
1720         tid = ath6kl_get_tid(tid_mux);
1721         if (tid >= NUM_OF_TIDS)
1722                 return;
1723
1724         rxtid = &aggr_conn->rx_tid[tid];
1725         stats = &aggr_conn->stat[tid];
1726
1727         if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1728                 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1729                            __func__, win_sz, tid);
1730
1731         if (rxtid->aggr)
1732                 aggr_delete_tid_state(aggr_conn, tid);
1733
1734         rxtid->seq_next = seq_no;
1735         hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1736         rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1737         if (!rxtid->hold_q)
1738                 return;
1739
1740         rxtid->win_sz = win_sz;
1741         rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1742         if (!skb_queue_empty(&rxtid->q))
1743                 return;
1744
1745         rxtid->aggr = true;
1746 }
1747
1748 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1749                     struct aggr_info_conn *aggr_conn)
1750 {
1751         struct rxtid *rxtid;
1752         u8 i;
1753
1754         aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1755         aggr_conn->dev = vif->ndev;
1756         init_timer(&aggr_conn->timer);
1757         aggr_conn->timer.function = aggr_timeout;
1758         aggr_conn->timer.data = (unsigned long) aggr_conn;
1759         aggr_conn->aggr_info = aggr_info;
1760
1761         aggr_conn->timer_scheduled = false;
1762
1763         for (i = 0; i < NUM_OF_TIDS; i++) {
1764                 rxtid = &aggr_conn->rx_tid[i];
1765                 rxtid->aggr = false;
1766                 rxtid->timer_mon = false;
1767                 skb_queue_head_init(&rxtid->q);
1768                 spin_lock_init(&rxtid->lock);
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
1813         if (!aggr_conn)
1814                 return;
1815
1816         tid = ath6kl_get_tid(tid_mux);
1817         if (tid >= NUM_OF_TIDS)
1818                 return;
1819
1820         rxtid = &aggr_conn->rx_tid[tid];
1821
1822         if (rxtid->aggr)
1823                 aggr_delete_tid_state(aggr_conn, tid);
1824 }
1825
1826 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1827 {
1828         u8 tid;
1829
1830         if (!aggr_conn)
1831                 return;
1832
1833         if (aggr_conn->timer_scheduled) {
1834                 del_timer(&aggr_conn->timer);
1835                 aggr_conn->timer_scheduled = false;
1836         }
1837
1838         for (tid = 0; tid < NUM_OF_TIDS; tid++)
1839                 aggr_delete_tid_state(aggr_conn, tid);
1840 }
1841
1842 /* clean up our amsdu buffer list */
1843 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1844 {
1845         struct htc_packet *packet, *tmp_pkt;
1846
1847         spin_lock_bh(&ar->lock);
1848         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1849                 spin_unlock_bh(&ar->lock);
1850                 return;
1851         }
1852
1853         list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1854                                  list) {
1855                 list_del(&packet->list);
1856                 spin_unlock_bh(&ar->lock);
1857                 dev_kfree_skb(packet->pkt_cntxt);
1858                 spin_lock_bh(&ar->lock);
1859         }
1860
1861         spin_unlock_bh(&ar->lock);
1862 }
1863
1864 void aggr_module_destroy(struct aggr_info *aggr_info)
1865 {
1866         if (!aggr_info)
1867                 return;
1868
1869         aggr_reset_state(aggr_info->aggr_conn);
1870         skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1871         kfree(aggr_info->aggr_conn);
1872         kfree(aggr_info);
1873 }