xref: /linux/drivers/net/wireless/ath/ath6kl/txrx.c (revision b889fcf63cb62e7fdb7816565e28f44dbe4a76a5)
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 
24 /*
25  * tid - tid_mux0..tid_mux3
26  * aid - tid_mux4..tid_mux7
27  */
28 #define ATH6KL_TID_MASK 0xf
29 #define ATH6KL_AID_SHIFT 4
30 
31 static inline u8 ath6kl_get_tid(u8 tid_mux)
32 {
33 	return tid_mux & ATH6KL_TID_MASK;
34 }
35 
36 static inline u8 ath6kl_get_aid(u8 tid_mux)
37 {
38 	return tid_mux >> ATH6KL_AID_SHIFT;
39 }
40 
41 static u8 ath6kl_ibss_map_epid(struct sk_buff *skb, struct net_device *dev,
42 			       u32 *map_no)
43 {
44 	struct ath6kl *ar = ath6kl_priv(dev);
45 	struct ethhdr *eth_hdr;
46 	u32 i, ep_map = -1;
47 	u8 *datap;
48 
49 	*map_no = 0;
50 	datap = skb->data;
51 	eth_hdr = (struct ethhdr *) (datap + sizeof(struct wmi_data_hdr));
52 
53 	if (is_multicast_ether_addr(eth_hdr->h_dest))
54 		return ENDPOINT_2;
55 
56 	for (i = 0; i < ar->node_num; i++) {
57 		if (memcmp(eth_hdr->h_dest, ar->node_map[i].mac_addr,
58 			   ETH_ALEN) == 0) {
59 			*map_no = i + 1;
60 			ar->node_map[i].tx_pend++;
61 			return ar->node_map[i].ep_id;
62 		}
63 
64 		if ((ep_map == -1) && !ar->node_map[i].tx_pend)
65 			ep_map = i;
66 	}
67 
68 	if (ep_map == -1) {
69 		ep_map = ar->node_num;
70 		ar->node_num++;
71 		if (ar->node_num > MAX_NODE_NUM)
72 			return ENDPOINT_UNUSED;
73 	}
74 
75 	memcpy(ar->node_map[ep_map].mac_addr, eth_hdr->h_dest, ETH_ALEN);
76 
77 	for (i = ENDPOINT_2; i <= ENDPOINT_5; i++) {
78 		if (!ar->tx_pending[i]) {
79 			ar->node_map[ep_map].ep_id = i;
80 			break;
81 		}
82 
83 		/*
84 		 * No free endpoint is available, start redistribution on
85 		 * the inuse endpoints.
86 		 */
87 		if (i == ENDPOINT_5) {
88 			ar->node_map[ep_map].ep_id = ar->next_ep_id;
89 			ar->next_ep_id++;
90 			if (ar->next_ep_id > ENDPOINT_5)
91 				ar->next_ep_id = ENDPOINT_2;
92 		}
93 	}
94 
95 	*map_no = ep_map + 1;
96 	ar->node_map[ep_map].tx_pend++;
97 
98 	return ar->node_map[ep_map].ep_id;
99 }
100 
101 static bool ath6kl_process_uapsdq(struct ath6kl_sta *conn,
102 				struct ath6kl_vif *vif,
103 				struct sk_buff *skb,
104 				u32 *flags)
105 {
106 	struct ath6kl *ar = vif->ar;
107 	bool is_apsdq_empty = false;
108 	struct ethhdr *datap = (struct ethhdr *) skb->data;
109 	u8 up = 0, traffic_class, *ip_hdr;
110 	u16 ether_type;
111 	struct ath6kl_llc_snap_hdr *llc_hdr;
112 
113 	if (conn->sta_flags & STA_PS_APSD_TRIGGER) {
114 		/*
115 		 * This tx is because of a uAPSD trigger, determine
116 		 * more and EOSP bit. Set EOSP if queue is empty
117 		 * or sufficient frames are delivered for this trigger.
118 		 */
119 		spin_lock_bh(&conn->psq_lock);
120 		if (!skb_queue_empty(&conn->apsdq))
121 			*flags |= WMI_DATA_HDR_FLAGS_MORE;
122 		else if (conn->sta_flags & STA_PS_APSD_EOSP)
123 			*flags |= WMI_DATA_HDR_FLAGS_EOSP;
124 		*flags |= WMI_DATA_HDR_FLAGS_UAPSD;
125 		spin_unlock_bh(&conn->psq_lock);
126 		return false;
127 	} else if (!conn->apsd_info)
128 		return false;
129 
130 	if (test_bit(WMM_ENABLED, &vif->flags)) {
131 		ether_type = be16_to_cpu(datap->h_proto);
132 		if (is_ethertype(ether_type)) {
133 			/* packet is in DIX format  */
134 			ip_hdr = (u8 *)(datap + 1);
135 		} else {
136 			/* packet is in 802.3 format */
137 			llc_hdr = (struct ath6kl_llc_snap_hdr *)
138 							(datap + 1);
139 			ether_type = be16_to_cpu(llc_hdr->eth_type);
140 			ip_hdr = (u8 *)(llc_hdr + 1);
141 		}
142 
143 		if (ether_type == IP_ETHERTYPE)
144 			up = ath6kl_wmi_determine_user_priority(
145 							ip_hdr, 0);
146 	}
147 
148 	traffic_class = ath6kl_wmi_get_traffic_class(up);
149 
150 	if ((conn->apsd_info & (1 << traffic_class)) == 0)
151 		return false;
152 
153 	/* Queue the frames if the STA is sleeping */
154 	spin_lock_bh(&conn->psq_lock);
155 	is_apsdq_empty = skb_queue_empty(&conn->apsdq);
156 	skb_queue_tail(&conn->apsdq, skb);
157 	spin_unlock_bh(&conn->psq_lock);
158 
159 	/*
160 	 * If this is the first pkt getting queued
161 	 * for this STA, update the PVB for this STA
162 	 */
163 	if (is_apsdq_empty) {
164 		ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
165 					      vif->fw_vif_idx,
166 					      conn->aid, 1, 0);
167 	}
168 	*flags |= WMI_DATA_HDR_FLAGS_UAPSD;
169 
170 	return true;
171 }
172 
173 static bool ath6kl_process_psq(struct ath6kl_sta *conn,
174 				struct ath6kl_vif *vif,
175 				struct sk_buff *skb,
176 				u32 *flags)
177 {
178 	bool is_psq_empty = false;
179 	struct ath6kl *ar = vif->ar;
180 
181 	if (conn->sta_flags & STA_PS_POLLED) {
182 		spin_lock_bh(&conn->psq_lock);
183 		if (!skb_queue_empty(&conn->psq))
184 			*flags |= WMI_DATA_HDR_FLAGS_MORE;
185 		spin_unlock_bh(&conn->psq_lock);
186 		return false;
187 	}
188 
189 	/* Queue the frames if the STA is sleeping */
190 	spin_lock_bh(&conn->psq_lock);
191 	is_psq_empty = skb_queue_empty(&conn->psq);
192 	skb_queue_tail(&conn->psq, skb);
193 	spin_unlock_bh(&conn->psq_lock);
194 
195 	/*
196 	 * If this is the first pkt getting queued
197 	 * for this STA, update the PVB for this
198 	 * STA.
199 	 */
200 	if (is_psq_empty)
201 		ath6kl_wmi_set_pvb_cmd(ar->wmi,
202 				       vif->fw_vif_idx,
203 				       conn->aid, 1);
204 	return true;
205 }
206 
207 static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb,
208 				u32 *flags)
209 {
210 	struct ethhdr *datap = (struct ethhdr *) skb->data;
211 	struct ath6kl_sta *conn = NULL;
212 	bool ps_queued = false;
213 	struct ath6kl *ar = vif->ar;
214 
215 	if (is_multicast_ether_addr(datap->h_dest)) {
216 		u8 ctr = 0;
217 		bool q_mcast = false;
218 
219 		for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
220 			if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) {
221 				q_mcast = true;
222 				break;
223 			}
224 		}
225 
226 		if (q_mcast) {
227 			/*
228 			 * If this transmit is not because of a Dtim Expiry
229 			 * q it.
230 			 */
231 			if (!test_bit(DTIM_EXPIRED, &vif->flags)) {
232 				bool is_mcastq_empty = false;
233 
234 				spin_lock_bh(&ar->mcastpsq_lock);
235 				is_mcastq_empty =
236 					skb_queue_empty(&ar->mcastpsq);
237 				skb_queue_tail(&ar->mcastpsq, skb);
238 				spin_unlock_bh(&ar->mcastpsq_lock);
239 
240 				/*
241 				 * If this is the first Mcast pkt getting
242 				 * queued indicate to the target to set the
243 				 * BitmapControl LSB of the TIM IE.
244 				 */
245 				if (is_mcastq_empty)
246 					ath6kl_wmi_set_pvb_cmd(ar->wmi,
247 							       vif->fw_vif_idx,
248 							       MCAST_AID, 1);
249 
250 				ps_queued = true;
251 			} else {
252 				/*
253 				 * This transmit is because of Dtim expiry.
254 				 * Determine if MoreData bit has to be set.
255 				 */
256 				spin_lock_bh(&ar->mcastpsq_lock);
257 				if (!skb_queue_empty(&ar->mcastpsq))
258 					*flags |= WMI_DATA_HDR_FLAGS_MORE;
259 				spin_unlock_bh(&ar->mcastpsq_lock);
260 			}
261 		}
262 	} else {
263 		conn = ath6kl_find_sta(vif, datap->h_dest);
264 		if (!conn) {
265 			dev_kfree_skb(skb);
266 
267 			/* Inform the caller that the skb is consumed */
268 			return true;
269 		}
270 
271 		if (conn->sta_flags & STA_PS_SLEEP) {
272 			ps_queued = ath6kl_process_uapsdq(conn,
273 						vif, skb, flags);
274 			if (!(*flags & WMI_DATA_HDR_FLAGS_UAPSD))
275 				ps_queued = ath6kl_process_psq(conn,
276 						vif, skb, flags);
277 		}
278 	}
279 	return ps_queued;
280 }
281 
282 /* Tx functions */
283 
284 int ath6kl_control_tx(void *devt, struct sk_buff *skb,
285 		      enum htc_endpoint_id eid)
286 {
287 	struct ath6kl *ar = devt;
288 	int status = 0;
289 	struct ath6kl_cookie *cookie = NULL;
290 
291 	if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW)) {
292 		dev_kfree_skb(skb);
293 		return -EACCES;
294 	}
295 
296 	if (WARN_ON_ONCE(eid == ENDPOINT_UNUSED ||
297 			 eid >= ENDPOINT_MAX)) {
298 		status = -EINVAL;
299 		goto fail_ctrl_tx;
300 	}
301 
302 	spin_lock_bh(&ar->lock);
303 
304 	ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
305 		   "%s: skb=0x%p, len=0x%x eid =%d\n", __func__,
306 		   skb, skb->len, eid);
307 
308 	if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) {
309 		/*
310 		 * Control endpoint is full, don't allocate resources, we
311 		 * are just going to drop this packet.
312 		 */
313 		cookie = NULL;
314 		ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n",
315 			   skb, skb->len);
316 	} else
317 		cookie = ath6kl_alloc_cookie(ar);
318 
319 	if (cookie == NULL) {
320 		spin_unlock_bh(&ar->lock);
321 		status = -ENOMEM;
322 		goto fail_ctrl_tx;
323 	}
324 
325 	ar->tx_pending[eid]++;
326 
327 	if (eid != ar->ctrl_ep)
328 		ar->total_tx_data_pend++;
329 
330 	spin_unlock_bh(&ar->lock);
331 
332 	cookie->skb = skb;
333 	cookie->map_no = 0;
334 	set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
335 			 eid, ATH6KL_CONTROL_PKT_TAG);
336 	cookie->htc_pkt.skb = skb;
337 
338 	/*
339 	 * This interface is asynchronous, if there is an error, cleanup
340 	 * will happen in the TX completion callback.
341 	 */
342 	ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
343 
344 	return 0;
345 
346 fail_ctrl_tx:
347 	dev_kfree_skb(skb);
348 	return status;
349 }
350 
351 int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
352 {
353 	struct ath6kl *ar = ath6kl_priv(dev);
354 	struct ath6kl_cookie *cookie = NULL;
355 	enum htc_endpoint_id eid = ENDPOINT_UNUSED;
356 	struct ath6kl_vif *vif = netdev_priv(dev);
357 	u32 map_no = 0;
358 	u16 htc_tag = ATH6KL_DATA_PKT_TAG;
359 	u8 ac = 99 ; /* initialize to unmapped ac */
360 	bool chk_adhoc_ps_mapping = false;
361 	int ret;
362 	struct wmi_tx_meta_v2 meta_v2;
363 	void *meta;
364 	u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed;
365 	u8 meta_ver = 0;
366 	u32 flags = 0;
367 
368 	ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
369 		   "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
370 		   skb, skb->data, skb->len);
371 
372 	/* If target is not associated */
373 	if (!test_bit(CONNECTED, &vif->flags))
374 		goto fail_tx;
375 
376 	if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON))
377 		goto fail_tx;
378 
379 	if (!test_bit(WMI_READY, &ar->flag))
380 		goto fail_tx;
381 
382 	/* AP mode Power saving processing */
383 	if (vif->nw_type == AP_NETWORK) {
384 		if (ath6kl_powersave_ap(vif, skb, &flags))
385 			return 0;
386 	}
387 
388 	if (test_bit(WMI_ENABLED, &ar->flag)) {
389 		if ((dev->features & NETIF_F_IP_CSUM) &&
390 		    (csum == CHECKSUM_PARTIAL)) {
391 			csum_start = skb->csum_start -
392 					(skb_network_header(skb) - skb->head) +
393 					sizeof(struct ath6kl_llc_snap_hdr);
394 			csum_dest = skb->csum_offset + csum_start;
395 		}
396 
397 		if (skb_headroom(skb) < dev->needed_headroom) {
398 			struct sk_buff *tmp_skb = skb;
399 
400 			skb = skb_realloc_headroom(skb, dev->needed_headroom);
401 			kfree_skb(tmp_skb);
402 			if (skb == NULL) {
403 				vif->net_stats.tx_dropped++;
404 				return 0;
405 			}
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 	spin_lock_bh(&ar->lock);
453 
454 	if (chk_adhoc_ps_mapping)
455 		eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
456 	else
457 		eid = ar->ac2ep_map[ac];
458 
459 	if (eid == 0 || eid == ENDPOINT_UNUSED) {
460 		ath6kl_err("eid %d is not mapped!\n", eid);
461 		spin_unlock_bh(&ar->lock);
462 		goto fail_tx;
463 	}
464 
465 	/* allocate resource for this packet */
466 	cookie = ath6kl_alloc_cookie(ar);
467 
468 	if (!cookie) {
469 		spin_unlock_bh(&ar->lock);
470 		goto fail_tx;
471 	}
472 
473 	/* update counts while the lock is held */
474 	ar->tx_pending[eid]++;
475 	ar->total_tx_data_pend++;
476 
477 	spin_unlock_bh(&ar->lock);
478 
479 	if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
480 	    skb_cloned(skb)) {
481 		/*
482 		 * We will touch (move the buffer data to align it. Since the
483 		 * skb buffer is cloned and not only the header is changed, we
484 		 * have to copy it to allow the changes. Since we are copying
485 		 * the data here, we may as well align it by reserving suitable
486 		 * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
487 		 */
488 		struct sk_buff *nskb;
489 
490 		nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
491 		if (nskb == NULL)
492 			goto fail_tx;
493 		kfree_skb(skb);
494 		skb = nskb;
495 	}
496 
497 	cookie->skb = skb;
498 	cookie->map_no = map_no;
499 	set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
500 			 eid, htc_tag);
501 	cookie->htc_pkt.skb = skb;
502 
503 	ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
504 			skb->data, skb->len);
505 
506 	/*
507 	 * HTC interface is asynchronous, if this fails, cleanup will
508 	 * happen in the ath6kl_tx_complete callback.
509 	 */
510 	ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
511 
512 	return 0;
513 
514 fail_tx:
515 	dev_kfree_skb(skb);
516 
517 	vif->net_stats.tx_dropped++;
518 	vif->net_stats.tx_aborted_errors++;
519 
520 	return 0;
521 }
522 
523 /* indicate tx activity or inactivity on a WMI stream */
524 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
525 {
526 	struct ath6kl *ar = devt;
527 	enum htc_endpoint_id eid;
528 	int i;
529 
530 	eid = ar->ac2ep_map[traffic_class];
531 
532 	if (!test_bit(WMI_ENABLED, &ar->flag))
533 		goto notify_htc;
534 
535 	spin_lock_bh(&ar->lock);
536 
537 	ar->ac_stream_active[traffic_class] = active;
538 
539 	if (active) {
540 		/*
541 		 * Keep track of the active stream with the highest
542 		 * priority.
543 		 */
544 		if (ar->ac_stream_pri_map[traffic_class] >
545 		    ar->hiac_stream_active_pri)
546 			/* set the new highest active priority */
547 			ar->hiac_stream_active_pri =
548 					ar->ac_stream_pri_map[traffic_class];
549 
550 	} else {
551 		/*
552 		 * We may have to search for the next active stream
553 		 * that is the highest priority.
554 		 */
555 		if (ar->hiac_stream_active_pri ==
556 			ar->ac_stream_pri_map[traffic_class]) {
557 			/*
558 			 * The highest priority stream just went inactive
559 			 * reset and search for the "next" highest "active"
560 			 * priority stream.
561 			 */
562 			ar->hiac_stream_active_pri = 0;
563 
564 			for (i = 0; i < WMM_NUM_AC; i++) {
565 				if (ar->ac_stream_active[i] &&
566 				    (ar->ac_stream_pri_map[i] >
567 				     ar->hiac_stream_active_pri))
568 					/*
569 					 * Set the new highest active
570 					 * priority.
571 					 */
572 					ar->hiac_stream_active_pri =
573 						ar->ac_stream_pri_map[i];
574 			}
575 		}
576 	}
577 
578 	spin_unlock_bh(&ar->lock);
579 
580 notify_htc:
581 	/* notify HTC, this may cause credit distribution changes */
582 	ath6kl_htc_activity_changed(ar->htc_target, eid, active);
583 }
584 
585 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
586 					       struct htc_packet *packet)
587 {
588 	struct ath6kl *ar = target->dev->ar;
589 	struct ath6kl_vif *vif;
590 	enum htc_endpoint_id endpoint = packet->endpoint;
591 	enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
592 
593 	if (endpoint == ar->ctrl_ep) {
594 		/*
595 		 * Under normal WMI if this is getting full, then something
596 		 * is running rampant the host should not be exhausting the
597 		 * WMI queue with too many commands the only exception to
598 		 * this is during testing using endpointping.
599 		 */
600 		set_bit(WMI_CTRL_EP_FULL, &ar->flag);
601 		ath6kl_err("wmi ctrl ep is full\n");
602 		ath6kl_recovery_err_notify(ar, ATH6KL_FW_EP_FULL);
603 		return action;
604 	}
605 
606 	if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
607 		return action;
608 
609 	/*
610 	 * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
611 	 * the highest active stream.
612 	 */
613 	if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
614 	    ar->hiac_stream_active_pri &&
615 	    ar->cookie_count <=
616 			target->endpoint[endpoint].tx_drop_packet_threshold)
617 		/*
618 		 * Give preference to the highest priority stream by
619 		 * dropping the packets which overflowed.
620 		 */
621 		action = HTC_SEND_FULL_DROP;
622 
623 	/* FIXME: Locking */
624 	spin_lock_bh(&ar->list_lock);
625 	list_for_each_entry(vif, &ar->vif_list, list) {
626 		if (vif->nw_type == ADHOC_NETWORK ||
627 		    action != HTC_SEND_FULL_DROP) {
628 			spin_unlock_bh(&ar->list_lock);
629 
630 			set_bit(NETQ_STOPPED, &vif->flags);
631 			netif_stop_queue(vif->ndev);
632 
633 			return action;
634 		}
635 	}
636 	spin_unlock_bh(&ar->list_lock);
637 
638 	return action;
639 }
640 
641 /* TODO this needs to be looked at */
642 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
643 				     enum htc_endpoint_id eid, u32 map_no)
644 {
645 	struct ath6kl *ar = vif->ar;
646 	u32 i;
647 
648 	if (vif->nw_type != ADHOC_NETWORK)
649 		return;
650 
651 	if (!ar->ibss_ps_enable)
652 		return;
653 
654 	if (eid == ar->ctrl_ep)
655 		return;
656 
657 	if (map_no == 0)
658 		return;
659 
660 	map_no--;
661 	ar->node_map[map_no].tx_pend--;
662 
663 	if (ar->node_map[map_no].tx_pend)
664 		return;
665 
666 	if (map_no != (ar->node_num - 1))
667 		return;
668 
669 	for (i = ar->node_num; i > 0; i--) {
670 		if (ar->node_map[i - 1].tx_pend)
671 			break;
672 
673 		memset(&ar->node_map[i - 1], 0,
674 		       sizeof(struct ath6kl_node_mapping));
675 		ar->node_num--;
676 	}
677 }
678 
679 void ath6kl_tx_complete(struct htc_target *target,
680 			struct list_head *packet_queue)
681 {
682 	struct ath6kl *ar = target->dev->ar;
683 	struct sk_buff_head skb_queue;
684 	struct htc_packet *packet;
685 	struct sk_buff *skb;
686 	struct ath6kl_cookie *ath6kl_cookie;
687 	u32 map_no = 0;
688 	int status;
689 	enum htc_endpoint_id eid;
690 	bool wake_event = false;
691 	bool flushing[ATH6KL_VIF_MAX] = {false};
692 	u8 if_idx;
693 	struct ath6kl_vif *vif;
694 
695 	skb_queue_head_init(&skb_queue);
696 
697 	/* lock the driver as we update internal state */
698 	spin_lock_bh(&ar->lock);
699 
700 	/* reap completed packets */
701 	while (!list_empty(packet_queue)) {
702 
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->net_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->net_stats.tx_packets++;
782 			vif->net_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 		rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1093 		idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1094 	} while (idx != idx_end);
1095 
1096 	spin_unlock_bh(&rxtid->lock);
1097 
1098 	stats->num_delivered += skb_queue_len(&rxtid->q);
1099 
1100 	while ((skb = skb_dequeue(&rxtid->q)))
1101 		ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1102 }
1103 
1104 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1105 				  u16 seq_no,
1106 				  bool is_amsdu, struct sk_buff *frame)
1107 {
1108 	struct rxtid *rxtid;
1109 	struct rxtid_stats *stats;
1110 	struct sk_buff *skb;
1111 	struct skb_hold_q *node;
1112 	u16 idx, st, cur, end;
1113 	bool is_queued = false;
1114 	u16 extended_end;
1115 
1116 	rxtid = &agg_conn->rx_tid[tid];
1117 	stats = &agg_conn->stat[tid];
1118 
1119 	stats->num_into_aggr++;
1120 
1121 	if (!rxtid->aggr) {
1122 		if (is_amsdu) {
1123 			aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1124 			is_queued = true;
1125 			stats->num_amsdu++;
1126 			while ((skb = skb_dequeue(&rxtid->q)))
1127 				ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1128 								  skb);
1129 		}
1130 		return is_queued;
1131 	}
1132 
1133 	/* Check the incoming sequence no, if it's in the window */
1134 	st = rxtid->seq_next;
1135 	cur = seq_no;
1136 	end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1137 
1138 	if (((st < end) && (cur < st || cur > end)) ||
1139 	    ((st > end) && (cur > end) && (cur < st))) {
1140 		extended_end = (end + rxtid->hold_q_sz - 1) &
1141 			ATH6KL_MAX_SEQ_NO;
1142 
1143 		if (((end < extended_end) &&
1144 		     (cur < end || cur > extended_end)) ||
1145 		    ((end > extended_end) && (cur > extended_end) &&
1146 		     (cur < end))) {
1147 			aggr_deque_frms(agg_conn, tid, 0, 0);
1148 			spin_lock_bh(&rxtid->lock);
1149 			if (cur >= rxtid->hold_q_sz - 1)
1150 				rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1151 			else
1152 				rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1153 						  (rxtid->hold_q_sz - 2 - cur);
1154 			spin_unlock_bh(&rxtid->lock);
1155 		} else {
1156 			/*
1157 			 * Dequeue only those frames that are outside the
1158 			 * new shifted window.
1159 			 */
1160 			if (cur >= rxtid->hold_q_sz - 1)
1161 				st = cur - (rxtid->hold_q_sz - 1);
1162 			else
1163 				st = ATH6KL_MAX_SEQ_NO -
1164 					(rxtid->hold_q_sz - 2 - cur);
1165 
1166 			aggr_deque_frms(agg_conn, tid, st, 0);
1167 		}
1168 
1169 		stats->num_oow++;
1170 	}
1171 
1172 	idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1173 
1174 	node = &rxtid->hold_q[idx];
1175 
1176 	spin_lock_bh(&rxtid->lock);
1177 
1178 	/*
1179 	 * Is the cur frame duplicate or something beyond our window(hold_q
1180 	 * -> which is 2x, already)?
1181 	 *
1182 	 * 1. Duplicate is easy - drop incoming frame.
1183 	 * 2. Not falling in current sliding window.
1184 	 *  2a. is the frame_seq_no preceding current tid_seq_no?
1185 	 *      -> drop the frame. perhaps sender did not get our ACK.
1186 	 *         this is taken care of above.
1187 	 *  2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1188 	 *      -> Taken care of it above, by moving window forward.
1189 	 */
1190 	dev_kfree_skb(node->skb);
1191 	stats->num_dups++;
1192 
1193 	node->skb = frame;
1194 	is_queued = true;
1195 	node->is_amsdu = is_amsdu;
1196 	node->seq_no = seq_no;
1197 
1198 	if (node->is_amsdu)
1199 		stats->num_amsdu++;
1200 	else
1201 		stats->num_mpdu++;
1202 
1203 	spin_unlock_bh(&rxtid->lock);
1204 
1205 	aggr_deque_frms(agg_conn, tid, 0, 1);
1206 
1207 	if (agg_conn->timer_scheduled)
1208 		return is_queued;
1209 
1210 	spin_lock_bh(&rxtid->lock);
1211 	for (idx = 0 ; idx < rxtid->hold_q_sz; idx++) {
1212 		if (rxtid->hold_q[idx].skb) {
1213 			/*
1214 			 * There is a frame in the queue and no
1215 			 * timer so start a timer to ensure that
1216 			 * the frame doesn't remain stuck
1217 			 * forever.
1218 			 */
1219 			agg_conn->timer_scheduled = true;
1220 			mod_timer(&agg_conn->timer,
1221 				  (jiffies + (HZ * AGGR_RX_TIMEOUT) / 1000));
1222 			rxtid->timer_mon = true;
1223 			break;
1224 		}
1225 	}
1226 	spin_unlock_bh(&rxtid->lock);
1227 
1228 	return is_queued;
1229 }
1230 
1231 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1232 						 struct ath6kl_sta *conn)
1233 {
1234 	struct ath6kl *ar = vif->ar;
1235 	bool is_apsdq_empty, is_apsdq_empty_at_start;
1236 	u32 num_frames_to_deliver, flags;
1237 	struct sk_buff *skb = NULL;
1238 
1239 	/*
1240 	 * If the APSD q for this STA is not empty, dequeue and
1241 	 * send a pkt from the head of the q. Also update the
1242 	 * More data bit in the WMI_DATA_HDR if there are
1243 	 * more pkts for this STA in the APSD q.
1244 	 * If there are no more pkts for this STA,
1245 	 * update the APSD bitmap for this STA.
1246 	 */
1247 
1248 	num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1249 						    ATH6KL_APSD_FRAME_MASK;
1250 	/*
1251 	 * Number of frames to send in a service period is
1252 	 * indicated by the station
1253 	 * in the QOS_INFO of the association request
1254 	 * If it is zero, send all frames
1255 	 */
1256 	if (!num_frames_to_deliver)
1257 		num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1258 
1259 	spin_lock_bh(&conn->psq_lock);
1260 	is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1261 	spin_unlock_bh(&conn->psq_lock);
1262 	is_apsdq_empty_at_start = is_apsdq_empty;
1263 
1264 	while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1265 
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 || !(skb->data + 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->net_stats.rx_packets++;
1364 	vif->net_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->net_stats.rx_errors++;
1394 		vif->net_stats.rx_length_errors++;
1395 		dev_kfree_skb(skb);
1396 		return;
1397 	}
1398 
1399 	/* Get the Power save state of the STA */
1400 	if (vif->nw_type == AP_NETWORK) {
1401 		meta_type = wmi_data_hdr_get_meta(dhdr);
1402 
1403 		ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1404 			      WMI_DATA_HDR_PS_MASK);
1405 
1406 		offset = sizeof(struct wmi_data_hdr);
1407 		trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1408 
1409 		switch (meta_type) {
1410 		case 0:
1411 			break;
1412 		case WMI_META_VERSION_1:
1413 			offset += sizeof(struct wmi_rx_meta_v1);
1414 			break;
1415 		case WMI_META_VERSION_2:
1416 			offset += sizeof(struct wmi_rx_meta_v2);
1417 			break;
1418 		default:
1419 			break;
1420 		}
1421 
1422 		datap = (struct ethhdr *) (skb->data + offset);
1423 		conn = ath6kl_find_sta(vif, datap->h_source);
1424 
1425 		if (!conn) {
1426 			dev_kfree_skb(skb);
1427 			return;
1428 		}
1429 
1430 		/*
1431 		 * If there is a change in PS state of the STA,
1432 		 * take appropriate steps:
1433 		 *
1434 		 * 1. If Sleep-->Awake, flush the psq for the STA
1435 		 *    Clear the PVB for the STA.
1436 		 * 2. If Awake-->Sleep, Starting queueing frames
1437 		 *    the STA.
1438 		 */
1439 		prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1440 
1441 		if (ps_state)
1442 			conn->sta_flags |= STA_PS_SLEEP;
1443 		else
1444 			conn->sta_flags &= ~STA_PS_SLEEP;
1445 
1446 		/* Accept trigger only when the station is in sleep */
1447 		if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1448 			ath6kl_uapsd_trigger_frame_rx(vif, conn);
1449 
1450 		if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1451 			if (!(conn->sta_flags & STA_PS_SLEEP)) {
1452 				struct sk_buff *skbuff = NULL;
1453 				bool is_apsdq_empty;
1454 				struct ath6kl_mgmt_buff *mgmt;
1455 				u8 idx;
1456 
1457 				spin_lock_bh(&conn->psq_lock);
1458 				while (conn->mgmt_psq_len > 0) {
1459 					mgmt = list_first_entry(
1460 							&conn->mgmt_psq,
1461 							struct ath6kl_mgmt_buff,
1462 							list);
1463 					list_del(&mgmt->list);
1464 					conn->mgmt_psq_len--;
1465 					spin_unlock_bh(&conn->psq_lock);
1466 					idx = vif->fw_vif_idx;
1467 
1468 					ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1469 								 idx,
1470 								 mgmt->id,
1471 								 mgmt->freq,
1472 								 mgmt->wait,
1473 								 mgmt->buf,
1474 								 mgmt->len,
1475 								 mgmt->no_cck);
1476 
1477 					kfree(mgmt);
1478 					spin_lock_bh(&conn->psq_lock);
1479 				}
1480 				conn->mgmt_psq_len = 0;
1481 				while ((skbuff = skb_dequeue(&conn->psq))) {
1482 					spin_unlock_bh(&conn->psq_lock);
1483 					ath6kl_data_tx(skbuff, vif->ndev);
1484 					spin_lock_bh(&conn->psq_lock);
1485 				}
1486 
1487 				is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1488 				while ((skbuff = skb_dequeue(&conn->apsdq))) {
1489 					spin_unlock_bh(&conn->psq_lock);
1490 					ath6kl_data_tx(skbuff, vif->ndev);
1491 					spin_lock_bh(&conn->psq_lock);
1492 				}
1493 				spin_unlock_bh(&conn->psq_lock);
1494 
1495 				if (!is_apsdq_empty)
1496 					ath6kl_wmi_set_apsd_bfrd_traf(
1497 							ar->wmi,
1498 							vif->fw_vif_idx,
1499 							conn->aid, 0, 0);
1500 
1501 				/* Clear the PVB for this STA */
1502 				ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1503 						       conn->aid, 0);
1504 			}
1505 		}
1506 
1507 		/* drop NULL data frames here */
1508 		if ((packet->act_len < min_hdr_len) ||
1509 		    (packet->act_len >
1510 		     WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1511 			dev_kfree_skb(skb);
1512 			return;
1513 		}
1514 	}
1515 
1516 	is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1517 	tid = wmi_data_hdr_get_up(dhdr);
1518 	seq_no = wmi_data_hdr_get_seqno(dhdr);
1519 	meta_type = wmi_data_hdr_get_meta(dhdr);
1520 	dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1521 	pad_before_data_start =
1522 		(le16_to_cpu(dhdr->info3) >> WMI_DATA_HDR_PAD_BEFORE_DATA_SHIFT)
1523 			& WMI_DATA_HDR_PAD_BEFORE_DATA_MASK;
1524 
1525 	skb_pull(skb, sizeof(struct wmi_data_hdr));
1526 
1527 	switch (meta_type) {
1528 	case WMI_META_VERSION_1:
1529 		skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1530 		break;
1531 	case WMI_META_VERSION_2:
1532 		meta = (struct wmi_rx_meta_v2 *) skb->data;
1533 		if (meta->csum_flags & 0x1) {
1534 			skb->ip_summed = CHECKSUM_COMPLETE;
1535 			skb->csum = (__force __wsum) meta->csum;
1536 		}
1537 		skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1538 		break;
1539 	default:
1540 		break;
1541 	}
1542 
1543 	skb_pull(skb, pad_before_data_start);
1544 
1545 	if (dot11_hdr)
1546 		status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1547 	else if (!is_amsdu)
1548 		status = ath6kl_wmi_dot3_2_dix(skb);
1549 
1550 	if (status) {
1551 		/*
1552 		 * Drop frames that could not be processed (lack of
1553 		 * memory, etc.)
1554 		 */
1555 		dev_kfree_skb(skb);
1556 		return;
1557 	}
1558 
1559 	if (!(vif->ndev->flags & IFF_UP)) {
1560 		dev_kfree_skb(skb);
1561 		return;
1562 	}
1563 
1564 	if (vif->nw_type == AP_NETWORK) {
1565 		datap = (struct ethhdr *) skb->data;
1566 		if (is_multicast_ether_addr(datap->h_dest))
1567 			/*
1568 			 * Bcast/Mcast frames should be sent to the
1569 			 * OS stack as well as on the air.
1570 			 */
1571 			skb1 = skb_copy(skb, GFP_ATOMIC);
1572 		else {
1573 			/*
1574 			 * Search for a connected STA with dstMac
1575 			 * as the Mac address. If found send the
1576 			 * frame to it on the air else send the
1577 			 * frame up the stack.
1578 			 */
1579 			conn = ath6kl_find_sta(vif, datap->h_dest);
1580 
1581 			if (conn && ar->intra_bss) {
1582 				skb1 = skb;
1583 				skb = NULL;
1584 			} else if (conn && !ar->intra_bss) {
1585 				dev_kfree_skb(skb);
1586 				skb = NULL;
1587 			}
1588 		}
1589 		if (skb1)
1590 			ath6kl_data_tx(skb1, vif->ndev);
1591 
1592 		if (skb == NULL) {
1593 			/* nothing to deliver up the stack */
1594 			return;
1595 		}
1596 	}
1597 
1598 	datap = (struct ethhdr *) skb->data;
1599 
1600 	if (is_unicast_ether_addr(datap->h_dest)) {
1601 		if (vif->nw_type == AP_NETWORK) {
1602 			conn = ath6kl_find_sta(vif, datap->h_source);
1603 			if (!conn)
1604 				return;
1605 			aggr_conn = conn->aggr_conn;
1606 		} else
1607 			aggr_conn = vif->aggr_cntxt->aggr_conn;
1608 
1609 		if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1610 					  is_amsdu, skb)) {
1611 			/* aggregation code will handle the skb */
1612 			return;
1613 		}
1614 	} else if (!is_broadcast_ether_addr(datap->h_dest))
1615 		vif->net_stats.multicast++;
1616 
1617 	ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1618 }
1619 
1620 static void aggr_timeout(unsigned long arg)
1621 {
1622 	u8 i, j;
1623 	struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg;
1624 	struct rxtid *rxtid;
1625 	struct rxtid_stats *stats;
1626 
1627 	for (i = 0; i < NUM_OF_TIDS; i++) {
1628 		rxtid = &aggr_conn->rx_tid[i];
1629 		stats = &aggr_conn->stat[i];
1630 
1631 		if (!rxtid->aggr || !rxtid->timer_mon)
1632 			continue;
1633 
1634 		stats->num_timeouts++;
1635 		ath6kl_dbg(ATH6KL_DBG_AGGR,
1636 			   "aggr timeout (st %d end %d)\n",
1637 			   rxtid->seq_next,
1638 			   ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1639 			    ATH6KL_MAX_SEQ_NO));
1640 		aggr_deque_frms(aggr_conn, i, 0, 0);
1641 	}
1642 
1643 	aggr_conn->timer_scheduled = false;
1644 
1645 	for (i = 0; i < NUM_OF_TIDS; i++) {
1646 		rxtid = &aggr_conn->rx_tid[i];
1647 
1648 		if (rxtid->aggr && rxtid->hold_q) {
1649 			spin_lock_bh(&rxtid->lock);
1650 			for (j = 0; j < rxtid->hold_q_sz; j++) {
1651 				if (rxtid->hold_q[j].skb) {
1652 					aggr_conn->timer_scheduled = true;
1653 					rxtid->timer_mon = true;
1654 					break;
1655 				}
1656 			}
1657 			spin_unlock_bh(&rxtid->lock);
1658 
1659 			if (j >= rxtid->hold_q_sz)
1660 				rxtid->timer_mon = false;
1661 		}
1662 	}
1663 
1664 	if (aggr_conn->timer_scheduled)
1665 		mod_timer(&aggr_conn->timer,
1666 			  jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1667 }
1668 
1669 static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid)
1670 {
1671 	struct rxtid *rxtid;
1672 	struct rxtid_stats *stats;
1673 
1674 	if (!aggr_conn || tid >= NUM_OF_TIDS)
1675 		return;
1676 
1677 	rxtid = &aggr_conn->rx_tid[tid];
1678 	stats = &aggr_conn->stat[tid];
1679 
1680 	if (rxtid->aggr)
1681 		aggr_deque_frms(aggr_conn, tid, 0, 0);
1682 
1683 	rxtid->aggr = false;
1684 	rxtid->timer_mon = false;
1685 	rxtid->win_sz = 0;
1686 	rxtid->seq_next = 0;
1687 	rxtid->hold_q_sz = 0;
1688 
1689 	kfree(rxtid->hold_q);
1690 	rxtid->hold_q = NULL;
1691 
1692 	memset(stats, 0, sizeof(struct rxtid_stats));
1693 }
1694 
1695 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no,
1696 			     u8 win_sz)
1697 {
1698 	struct ath6kl_sta *sta;
1699 	struct aggr_info_conn *aggr_conn = NULL;
1700 	struct rxtid *rxtid;
1701 	struct rxtid_stats *stats;
1702 	u16 hold_q_size;
1703 	u8 tid, aid;
1704 
1705 	if (vif->nw_type == AP_NETWORK) {
1706 		aid = ath6kl_get_aid(tid_mux);
1707 		sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1708 		if (sta)
1709 			aggr_conn = sta->aggr_conn;
1710 	} else
1711 		aggr_conn = vif->aggr_cntxt->aggr_conn;
1712 
1713 	if (!aggr_conn)
1714 		return;
1715 
1716 	tid = ath6kl_get_tid(tid_mux);
1717 	if (tid >= NUM_OF_TIDS)
1718 		return;
1719 
1720 	rxtid = &aggr_conn->rx_tid[tid];
1721 	stats = &aggr_conn->stat[tid];
1722 
1723 	if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1724 		ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1725 			   __func__, win_sz, tid);
1726 
1727 	if (rxtid->aggr)
1728 		aggr_delete_tid_state(aggr_conn, tid);
1729 
1730 	rxtid->seq_next = seq_no;
1731 	hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1732 	rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1733 	if (!rxtid->hold_q)
1734 		return;
1735 
1736 	rxtid->win_sz = win_sz;
1737 	rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1738 	if (!skb_queue_empty(&rxtid->q))
1739 		return;
1740 
1741 	rxtid->aggr = true;
1742 }
1743 
1744 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1745 		    struct aggr_info_conn *aggr_conn)
1746 {
1747 	struct rxtid *rxtid;
1748 	u8 i;
1749 
1750 	aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1751 	aggr_conn->dev = vif->ndev;
1752 	init_timer(&aggr_conn->timer);
1753 	aggr_conn->timer.function = aggr_timeout;
1754 	aggr_conn->timer.data = (unsigned long) aggr_conn;
1755 	aggr_conn->aggr_info = aggr_info;
1756 
1757 	aggr_conn->timer_scheduled = false;
1758 
1759 	for (i = 0; i < NUM_OF_TIDS; i++) {
1760 		rxtid = &aggr_conn->rx_tid[i];
1761 		rxtid->aggr = false;
1762 		rxtid->timer_mon = false;
1763 		skb_queue_head_init(&rxtid->q);
1764 		spin_lock_init(&rxtid->lock);
1765 	}
1766 
1767 }
1768 
1769 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1770 {
1771 	struct aggr_info *p_aggr = NULL;
1772 
1773 	p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1774 	if (!p_aggr) {
1775 		ath6kl_err("failed to alloc memory for aggr_node\n");
1776 		return NULL;
1777 	}
1778 
1779 	p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1780 	if (!p_aggr->aggr_conn) {
1781 		ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1782 		kfree(p_aggr);
1783 		return NULL;
1784 	}
1785 
1786 	aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1787 
1788 	skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1789 	ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1790 
1791 	return p_aggr;
1792 }
1793 
1794 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1795 {
1796 	struct ath6kl_sta *sta;
1797 	struct rxtid *rxtid;
1798 	struct aggr_info_conn *aggr_conn = NULL;
1799 	u8 tid, aid;
1800 
1801 	if (vif->nw_type == AP_NETWORK) {
1802 		aid = ath6kl_get_aid(tid_mux);
1803 		sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1804 		if (sta)
1805 			aggr_conn = sta->aggr_conn;
1806 	} else
1807 		aggr_conn = vif->aggr_cntxt->aggr_conn;
1808 
1809 	if (!aggr_conn)
1810 		return;
1811 
1812 	tid = ath6kl_get_tid(tid_mux);
1813 	if (tid >= NUM_OF_TIDS)
1814 		return;
1815 
1816 	rxtid = &aggr_conn->rx_tid[tid];
1817 
1818 	if (rxtid->aggr)
1819 		aggr_delete_tid_state(aggr_conn, tid);
1820 }
1821 
1822 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1823 {
1824 	u8 tid;
1825 
1826 	if (!aggr_conn)
1827 		return;
1828 
1829 	if (aggr_conn->timer_scheduled) {
1830 		del_timer(&aggr_conn->timer);
1831 		aggr_conn->timer_scheduled = false;
1832 	}
1833 
1834 	for (tid = 0; tid < NUM_OF_TIDS; tid++)
1835 		aggr_delete_tid_state(aggr_conn, tid);
1836 }
1837 
1838 /* clean up our amsdu buffer list */
1839 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1840 {
1841 	struct htc_packet *packet, *tmp_pkt;
1842 
1843 	spin_lock_bh(&ar->lock);
1844 	if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1845 		spin_unlock_bh(&ar->lock);
1846 		return;
1847 	}
1848 
1849 	list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1850 				 list) {
1851 		list_del(&packet->list);
1852 		spin_unlock_bh(&ar->lock);
1853 		dev_kfree_skb(packet->pkt_cntxt);
1854 		spin_lock_bh(&ar->lock);
1855 	}
1856 
1857 	spin_unlock_bh(&ar->lock);
1858 }
1859 
1860 void aggr_module_destroy(struct aggr_info *aggr_info)
1861 {
1862 	if (!aggr_info)
1863 		return;
1864 
1865 	aggr_reset_state(aggr_info->aggr_conn);
1866 	skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1867 	kfree(aggr_info->aggr_conn);
1868 	kfree(aggr_info);
1869 }
1870