xref: /openbmc/linux/drivers/net/wireless/ti/wlcore/tx.c (revision e23feb16)
1 /*
2  * This file is part of wl1271
3  *
4  * Copyright (C) 2009 Nokia Corporation
5  *
6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA
21  *
22  */
23 
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/etherdevice.h>
27 #include <linux/spinlock.h>
28 
29 #include "wlcore.h"
30 #include "debug.h"
31 #include "io.h"
32 #include "ps.h"
33 #include "tx.h"
34 #include "event.h"
35 #include "hw_ops.h"
36 
37 /*
38  * TODO: this is here just for now, it must be removed when the data
39  * operations are in place.
40  */
41 #include "../wl12xx/reg.h"
42 
43 static int wl1271_set_default_wep_key(struct wl1271 *wl,
44 				      struct wl12xx_vif *wlvif, u8 id)
45 {
46 	int ret;
47 	bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
48 
49 	if (is_ap)
50 		ret = wl12xx_cmd_set_default_wep_key(wl, id,
51 						     wlvif->ap.bcast_hlid);
52 	else
53 		ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
54 
55 	if (ret < 0)
56 		return ret;
57 
58 	wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
59 	return 0;
60 }
61 
62 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
63 {
64 	int id;
65 
66 	id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc);
67 	if (id >= wl->num_tx_desc)
68 		return -EBUSY;
69 
70 	__set_bit(id, wl->tx_frames_map);
71 	wl->tx_frames[id] = skb;
72 	wl->tx_frames_cnt++;
73 	return id;
74 }
75 
76 void wl1271_free_tx_id(struct wl1271 *wl, int id)
77 {
78 	if (__test_and_clear_bit(id, wl->tx_frames_map)) {
79 		if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc))
80 			clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
81 
82 		wl->tx_frames[id] = NULL;
83 		wl->tx_frames_cnt--;
84 	}
85 }
86 EXPORT_SYMBOL(wl1271_free_tx_id);
87 
88 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
89 						 struct sk_buff *skb)
90 {
91 	struct ieee80211_hdr *hdr;
92 
93 	/*
94 	 * add the station to the known list before transmitting the
95 	 * authentication response. this way it won't get de-authed by FW
96 	 * when transmitting too soon.
97 	 */
98 	hdr = (struct ieee80211_hdr *)(skb->data +
99 				       sizeof(struct wl1271_tx_hw_descr));
100 	if (ieee80211_is_auth(hdr->frame_control))
101 		wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
102 }
103 
104 static void wl1271_tx_regulate_link(struct wl1271 *wl,
105 				    struct wl12xx_vif *wlvif,
106 				    u8 hlid)
107 {
108 	bool fw_ps;
109 	u8 tx_pkts;
110 
111 	if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
112 		return;
113 
114 	fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
115 	tx_pkts = wl->links[hlid].allocated_pkts;
116 
117 	/*
118 	 * if in FW PS and there is enough data in FW we can put the link
119 	 * into high-level PS and clean out its TX queues.
120 	 * Make an exception if this is the only connected link. In this
121 	 * case FW-memory congestion is less of a problem.
122 	 * Note that a single connected STA means 3 active links, since we must
123 	 * account for the global and broadcast AP links. The "fw_ps" check
124 	 * assures us the third link is a STA connected to the AP. Otherwise
125 	 * the FW would not set the PSM bit.
126 	 */
127 	if (wl->active_link_count > 3 && fw_ps &&
128 	    tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
129 		wl12xx_ps_link_start(wl, wlvif, hlid, true);
130 }
131 
132 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
133 {
134 	return wl->dummy_packet == skb;
135 }
136 EXPORT_SYMBOL(wl12xx_is_dummy_packet);
137 
138 static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
139 				struct sk_buff *skb, struct ieee80211_sta *sta)
140 {
141 	if (sta) {
142 		struct wl1271_station *wl_sta;
143 
144 		wl_sta = (struct wl1271_station *)sta->drv_priv;
145 		return wl_sta->hlid;
146 	} else {
147 		struct ieee80211_hdr *hdr;
148 
149 		if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
150 			return wl->system_hlid;
151 
152 		hdr = (struct ieee80211_hdr *)skb->data;
153 		if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
154 			return wlvif->ap.bcast_hlid;
155 		else
156 			return wlvif->ap.global_hlid;
157 	}
158 }
159 
160 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
161 		      struct sk_buff *skb, struct ieee80211_sta *sta)
162 {
163 	struct ieee80211_tx_info *control;
164 
165 	if (wlvif->bss_type == BSS_TYPE_AP_BSS)
166 		return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta);
167 
168 	control = IEEE80211_SKB_CB(skb);
169 	if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
170 		wl1271_debug(DEBUG_TX, "tx offchannel");
171 		return wlvif->dev_hlid;
172 	}
173 
174 	return wlvif->sta.hlid;
175 }
176 
177 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
178 					  unsigned int packet_length)
179 {
180 	if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
181 	    !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
182 		return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
183 	else
184 		return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
185 }
186 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
187 
188 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
189 			      struct sk_buff *skb, u32 extra, u32 buf_offset,
190 			      u8 hlid, bool is_gem)
191 {
192 	struct wl1271_tx_hw_descr *desc;
193 	u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
194 	u32 total_blocks;
195 	int id, ret = -EBUSY, ac;
196 	u32 spare_blocks;
197 
198 	if (buf_offset + total_len > wl->aggr_buf_size)
199 		return -EAGAIN;
200 
201 	spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
202 
203 	/* allocate free identifier for the packet */
204 	id = wl1271_alloc_tx_id(wl, skb);
205 	if (id < 0)
206 		return id;
207 
208 	total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
209 
210 	if (total_blocks <= wl->tx_blocks_available) {
211 		desc = (struct wl1271_tx_hw_descr *)skb_push(
212 			skb, total_len - skb->len);
213 
214 		wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
215 					     spare_blocks);
216 
217 		desc->id = id;
218 
219 		wl->tx_blocks_available -= total_blocks;
220 		wl->tx_allocated_blocks += total_blocks;
221 
222 		/* If the FW was empty before, arm the Tx watchdog */
223 		if (wl->tx_allocated_blocks == total_blocks)
224 			wl12xx_rearm_tx_watchdog_locked(wl);
225 
226 		ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
227 		wl->tx_allocated_pkts[ac]++;
228 
229 		if (test_bit(hlid, wl->links_map))
230 			wl->links[hlid].allocated_pkts++;
231 
232 		ret = 0;
233 
234 		wl1271_debug(DEBUG_TX,
235 			     "tx_allocate: size: %d, blocks: %d, id: %d",
236 			     total_len, total_blocks, id);
237 	} else {
238 		wl1271_free_tx_id(wl, id);
239 	}
240 
241 	return ret;
242 }
243 
244 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
245 			       struct sk_buff *skb, u32 extra,
246 			       struct ieee80211_tx_info *control, u8 hlid)
247 {
248 	struct timespec ts;
249 	struct wl1271_tx_hw_descr *desc;
250 	int ac, rate_idx;
251 	s64 hosttime;
252 	u16 tx_attr = 0;
253 	__le16 frame_control;
254 	struct ieee80211_hdr *hdr;
255 	u8 *frame_start;
256 	bool is_dummy;
257 
258 	desc = (struct wl1271_tx_hw_descr *) skb->data;
259 	frame_start = (u8 *)(desc + 1);
260 	hdr = (struct ieee80211_hdr *)(frame_start + extra);
261 	frame_control = hdr->frame_control;
262 
263 	/* relocate space for security header */
264 	if (extra) {
265 		int hdrlen = ieee80211_hdrlen(frame_control);
266 		memmove(frame_start, hdr, hdrlen);
267 		skb_set_network_header(skb, skb_network_offset(skb) + extra);
268 	}
269 
270 	/* configure packet life time */
271 	getnstimeofday(&ts);
272 	hosttime = (timespec_to_ns(&ts) >> 10);
273 	desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
274 
275 	is_dummy = wl12xx_is_dummy_packet(wl, skb);
276 	if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
277 		desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
278 	else
279 		desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
280 
281 	/* queue */
282 	ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
283 	desc->tid = skb->priority;
284 
285 	if (is_dummy) {
286 		/*
287 		 * FW expects the dummy packet to have an invalid session id -
288 		 * any session id that is different than the one set in the join
289 		 */
290 		tx_attr = (SESSION_COUNTER_INVALID <<
291 			   TX_HW_ATTR_OFST_SESSION_COUNTER) &
292 			   TX_HW_ATTR_SESSION_COUNTER;
293 
294 		tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
295 	} else if (wlvif) {
296 		u8 session_id = wl->session_ids[hlid];
297 
298 		if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
299 		    (wlvif->bss_type == BSS_TYPE_AP_BSS))
300 			session_id = 0;
301 
302 		/* configure the tx attributes */
303 		tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
304 	}
305 
306 	desc->hlid = hlid;
307 	if (is_dummy || !wlvif)
308 		rate_idx = 0;
309 	else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
310 		/*
311 		 * if the packets are data packets
312 		 * send them with AP rate policies (EAPOLs are an exception),
313 		 * otherwise use default basic rates
314 		 */
315 		if (skb->protocol == cpu_to_be16(ETH_P_PAE))
316 			rate_idx = wlvif->sta.basic_rate_idx;
317 		else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
318 			rate_idx = wlvif->sta.p2p_rate_idx;
319 		else if (ieee80211_is_data(frame_control))
320 			rate_idx = wlvif->sta.ap_rate_idx;
321 		else
322 			rate_idx = wlvif->sta.basic_rate_idx;
323 	} else {
324 		if (hlid == wlvif->ap.global_hlid)
325 			rate_idx = wlvif->ap.mgmt_rate_idx;
326 		else if (hlid == wlvif->ap.bcast_hlid ||
327 			 skb->protocol == cpu_to_be16(ETH_P_PAE) ||
328 			 !ieee80211_is_data(frame_control))
329 			/*
330 			 * send non-data, bcast and EAPOLs using the
331 			 * min basic rate
332 			 */
333 			rate_idx = wlvif->ap.bcast_rate_idx;
334 		else
335 			rate_idx = wlvif->ap.ucast_rate_idx[ac];
336 	}
337 
338 	tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
339 
340 	/* for WEP shared auth - no fw encryption is needed */
341 	if (ieee80211_is_auth(frame_control) &&
342 	    ieee80211_has_protected(frame_control))
343 		tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
344 
345 	desc->tx_attr = cpu_to_le16(tx_attr);
346 
347 	wlcore_hw_set_tx_desc_csum(wl, desc, skb);
348 	wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
349 }
350 
351 /* caller must hold wl->mutex */
352 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
353 				   struct sk_buff *skb, u32 buf_offset, u8 hlid)
354 {
355 	struct ieee80211_tx_info *info;
356 	u32 extra = 0;
357 	int ret = 0;
358 	u32 total_len;
359 	bool is_dummy;
360 	bool is_gem = false;
361 
362 	if (!skb) {
363 		wl1271_error("discarding null skb");
364 		return -EINVAL;
365 	}
366 
367 	if (hlid == WL12XX_INVALID_LINK_ID) {
368 		wl1271_error("invalid hlid. dropping skb 0x%p", skb);
369 		return -EINVAL;
370 	}
371 
372 	info = IEEE80211_SKB_CB(skb);
373 
374 	is_dummy = wl12xx_is_dummy_packet(wl, skb);
375 
376 	if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
377 	    info->control.hw_key &&
378 	    info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
379 		extra = WL1271_EXTRA_SPACE_TKIP;
380 
381 	if (info->control.hw_key) {
382 		bool is_wep;
383 		u8 idx = info->control.hw_key->hw_key_idx;
384 		u32 cipher = info->control.hw_key->cipher;
385 
386 		is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
387 			 (cipher == WLAN_CIPHER_SUITE_WEP104);
388 
389 		if (WARN_ON(is_wep && wlvif->default_key != idx)) {
390 			ret = wl1271_set_default_wep_key(wl, wlvif, idx);
391 			if (ret < 0)
392 				return ret;
393 			wlvif->default_key = idx;
394 		}
395 
396 		is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
397 	}
398 
399 	ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
400 				 is_gem);
401 	if (ret < 0)
402 		return ret;
403 
404 	wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
405 
406 	if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
407 		wl1271_tx_ap_update_inconnection_sta(wl, skb);
408 		wl1271_tx_regulate_link(wl, wlvif, hlid);
409 	}
410 
411 	/*
412 	 * The length of each packet is stored in terms of
413 	 * words. Thus, we must pad the skb data to make sure its
414 	 * length is aligned.  The number of padding bytes is computed
415 	 * and set in wl1271_tx_fill_hdr.
416 	 * In special cases, we want to align to a specific block size
417 	 * (eg. for wl128x with SDIO we align to 256).
418 	 */
419 	total_len = wlcore_calc_packet_alignment(wl, skb->len);
420 
421 	memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
422 	memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
423 
424 	/* Revert side effects in the dummy packet skb, so it can be reused */
425 	if (is_dummy)
426 		skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
427 
428 	return total_len;
429 }
430 
431 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
432 				enum ieee80211_band rate_band)
433 {
434 	struct ieee80211_supported_band *band;
435 	u32 enabled_rates = 0;
436 	int bit;
437 
438 	band = wl->hw->wiphy->bands[rate_band];
439 	for (bit = 0; bit < band->n_bitrates; bit++) {
440 		if (rate_set & 0x1)
441 			enabled_rates |= band->bitrates[bit].hw_value;
442 		rate_set >>= 1;
443 	}
444 
445 	/* MCS rates indication are on bits 16 - 31 */
446 	rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
447 
448 	for (bit = 0; bit < 16; bit++) {
449 		if (rate_set & 0x1)
450 			enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
451 		rate_set >>= 1;
452 	}
453 
454 	return enabled_rates;
455 }
456 
457 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
458 {
459 	int i;
460 	struct wl12xx_vif *wlvif;
461 
462 	wl12xx_for_each_wlvif(wl, wlvif) {
463 		for (i = 0; i < NUM_TX_QUEUES; i++) {
464 			if (wlcore_is_queue_stopped_by_reason(wl, wlvif, i,
465 					WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
466 			    wlvif->tx_queue_count[i] <=
467 					WL1271_TX_QUEUE_LOW_WATERMARK)
468 				/* firmware buffer has space, restart queues */
469 				wlcore_wake_queue(wl, wlvif, i,
470 					WLCORE_QUEUE_STOP_REASON_WATERMARK);
471 		}
472 	}
473 }
474 
475 static int wlcore_select_ac(struct wl1271 *wl)
476 {
477 	int i, q = -1, ac;
478 	u32 min_pkts = 0xffffffff;
479 
480 	/*
481 	 * Find a non-empty ac where:
482 	 * 1. There are packets to transmit
483 	 * 2. The FW has the least allocated blocks
484 	 *
485 	 * We prioritize the ACs according to VO>VI>BE>BK
486 	 */
487 	for (i = 0; i < NUM_TX_QUEUES; i++) {
488 		ac = wl1271_tx_get_queue(i);
489 		if (wl->tx_queue_count[ac] &&
490 		    wl->tx_allocated_pkts[ac] < min_pkts) {
491 			q = ac;
492 			min_pkts = wl->tx_allocated_pkts[q];
493 		}
494 	}
495 
496 	return q;
497 }
498 
499 static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl,
500 					  struct wl1271_link *lnk, u8 q)
501 {
502 	struct sk_buff *skb;
503 	unsigned long flags;
504 
505 	skb = skb_dequeue(&lnk->tx_queue[q]);
506 	if (skb) {
507 		spin_lock_irqsave(&wl->wl_lock, flags);
508 		WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
509 		wl->tx_queue_count[q]--;
510 		if (lnk->wlvif) {
511 			WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0);
512 			lnk->wlvif->tx_queue_count[q]--;
513 		}
514 		spin_unlock_irqrestore(&wl->wl_lock, flags);
515 	}
516 
517 	return skb;
518 }
519 
520 static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl,
521 						    u8 hlid, u8 ac,
522 						    u8 *low_prio_hlid)
523 {
524 	struct wl1271_link *lnk = &wl->links[hlid];
525 
526 	if (!wlcore_hw_lnk_high_prio(wl, hlid, lnk)) {
527 		if (*low_prio_hlid == WL12XX_INVALID_LINK_ID &&
528 		    !skb_queue_empty(&lnk->tx_queue[ac]) &&
529 		    wlcore_hw_lnk_low_prio(wl, hlid, lnk))
530 			/* we found the first non-empty low priority queue */
531 			*low_prio_hlid = hlid;
532 
533 		return NULL;
534 	}
535 
536 	return wlcore_lnk_dequeue(wl, lnk, ac);
537 }
538 
539 static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl,
540 						    struct wl12xx_vif *wlvif,
541 						    u8 ac, u8 *hlid,
542 						    u8 *low_prio_hlid)
543 {
544 	struct sk_buff *skb = NULL;
545 	int i, h, start_hlid;
546 
547 	/* start from the link after the last one */
548 	start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
549 
550 	/* dequeue according to AC, round robin on each link */
551 	for (i = 0; i < WL12XX_MAX_LINKS; i++) {
552 		h = (start_hlid + i) % WL12XX_MAX_LINKS;
553 
554 		/* only consider connected stations */
555 		if (!test_bit(h, wlvif->links_map))
556 			continue;
557 
558 		skb = wlcore_lnk_dequeue_high_prio(wl, h, ac,
559 						   low_prio_hlid);
560 		if (!skb)
561 			continue;
562 
563 		wlvif->last_tx_hlid = h;
564 		break;
565 	}
566 
567 	if (!skb)
568 		wlvif->last_tx_hlid = 0;
569 
570 	*hlid = wlvif->last_tx_hlid;
571 	return skb;
572 }
573 
574 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
575 {
576 	unsigned long flags;
577 	struct wl12xx_vif *wlvif = wl->last_wlvif;
578 	struct sk_buff *skb = NULL;
579 	int ac;
580 	u8 low_prio_hlid = WL12XX_INVALID_LINK_ID;
581 
582 	ac = wlcore_select_ac(wl);
583 	if (ac < 0)
584 		goto out;
585 
586 	/* continue from last wlvif (round robin) */
587 	if (wlvif) {
588 		wl12xx_for_each_wlvif_continue(wl, wlvif) {
589 			if (!wlvif->tx_queue_count[ac])
590 				continue;
591 
592 			skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
593 							   &low_prio_hlid);
594 			if (!skb)
595 				continue;
596 
597 			wl->last_wlvif = wlvif;
598 			break;
599 		}
600 	}
601 
602 	/* dequeue from the system HLID before the restarting wlvif list */
603 	if (!skb) {
604 		skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid,
605 						   ac, &low_prio_hlid);
606 		if (skb) {
607 			*hlid = wl->system_hlid;
608 			wl->last_wlvif = NULL;
609 		}
610 	}
611 
612 	/* Do a new pass over the wlvif list. But no need to continue
613 	 * after last_wlvif. The previous pass should have found it. */
614 	if (!skb) {
615 		wl12xx_for_each_wlvif(wl, wlvif) {
616 			if (!wlvif->tx_queue_count[ac])
617 				goto next;
618 
619 			skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
620 							   &low_prio_hlid);
621 			if (skb) {
622 				wl->last_wlvif = wlvif;
623 				break;
624 			}
625 
626 next:
627 			if (wlvif == wl->last_wlvif)
628 				break;
629 		}
630 	}
631 
632 	/* no high priority skbs found - but maybe a low priority one? */
633 	if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) {
634 		struct wl1271_link *lnk = &wl->links[low_prio_hlid];
635 		skb = wlcore_lnk_dequeue(wl, lnk, ac);
636 
637 		WARN_ON(!skb); /* we checked this before */
638 		*hlid = low_prio_hlid;
639 
640 		/* ensure proper round robin in the vif/link levels */
641 		wl->last_wlvif = lnk->wlvif;
642 		if (lnk->wlvif)
643 			lnk->wlvif->last_tx_hlid = low_prio_hlid;
644 
645 	}
646 
647 out:
648 	if (!skb &&
649 	    test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
650 		int q;
651 
652 		skb = wl->dummy_packet;
653 		*hlid = wl->system_hlid;
654 		q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
655 		spin_lock_irqsave(&wl->wl_lock, flags);
656 		WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
657 		wl->tx_queue_count[q]--;
658 		spin_unlock_irqrestore(&wl->wl_lock, flags);
659 	}
660 
661 	return skb;
662 }
663 
664 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
665 				  struct sk_buff *skb, u8 hlid)
666 {
667 	unsigned long flags;
668 	int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
669 
670 	if (wl12xx_is_dummy_packet(wl, skb)) {
671 		set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
672 	} else {
673 		skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
674 
675 		/* make sure we dequeue the same packet next time */
676 		wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
677 				      WL12XX_MAX_LINKS;
678 	}
679 
680 	spin_lock_irqsave(&wl->wl_lock, flags);
681 	wl->tx_queue_count[q]++;
682 	if (wlvif)
683 		wlvif->tx_queue_count[q]++;
684 	spin_unlock_irqrestore(&wl->wl_lock, flags);
685 }
686 
687 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
688 {
689 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
690 
691 	return ieee80211_is_data_present(hdr->frame_control);
692 }
693 
694 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
695 {
696 	struct wl12xx_vif *wlvif;
697 	u32 timeout;
698 	u8 hlid;
699 
700 	if (!wl->conf.rx_streaming.interval)
701 		return;
702 
703 	if (!wl->conf.rx_streaming.always &&
704 	    !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
705 		return;
706 
707 	timeout = wl->conf.rx_streaming.duration;
708 	wl12xx_for_each_wlvif_sta(wl, wlvif) {
709 		bool found = false;
710 		for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
711 			if (test_bit(hlid, wlvif->links_map)) {
712 				found  = true;
713 				break;
714 			}
715 		}
716 
717 		if (!found)
718 			continue;
719 
720 		/* enable rx streaming */
721 		if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
722 			ieee80211_queue_work(wl->hw,
723 					     &wlvif->rx_streaming_enable_work);
724 
725 		mod_timer(&wlvif->rx_streaming_timer,
726 			  jiffies + msecs_to_jiffies(timeout));
727 	}
728 }
729 
730 /*
731  * Returns failure values only in case of failed bus ops within this function.
732  * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
733  * triggering recovery by higher layers when not necessary.
734  * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
735  * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
736  * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
737  * within prepare_tx_frame code but there's nothing we should do about those
738  * as well.
739  */
740 int wlcore_tx_work_locked(struct wl1271 *wl)
741 {
742 	struct wl12xx_vif *wlvif;
743 	struct sk_buff *skb;
744 	struct wl1271_tx_hw_descr *desc;
745 	u32 buf_offset = 0, last_len = 0;
746 	bool sent_packets = false;
747 	unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
748 	int ret = 0;
749 	int bus_ret = 0;
750 	u8 hlid;
751 
752 	if (unlikely(wl->state != WLCORE_STATE_ON))
753 		return 0;
754 
755 	while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
756 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
757 		bool has_data = false;
758 
759 		wlvif = NULL;
760 		if (!wl12xx_is_dummy_packet(wl, skb))
761 			wlvif = wl12xx_vif_to_data(info->control.vif);
762 		else
763 			hlid = wl->system_hlid;
764 
765 		has_data = wlvif && wl1271_tx_is_data_present(skb);
766 		ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
767 					      hlid);
768 		if (ret == -EAGAIN) {
769 			/*
770 			 * Aggregation buffer is full.
771 			 * Flush buffer and try again.
772 			 */
773 			wl1271_skb_queue_head(wl, wlvif, skb, hlid);
774 
775 			buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
776 							    last_len);
777 			bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
778 					     wl->aggr_buf, buf_offset, true);
779 			if (bus_ret < 0)
780 				goto out;
781 
782 			sent_packets = true;
783 			buf_offset = 0;
784 			continue;
785 		} else if (ret == -EBUSY) {
786 			/*
787 			 * Firmware buffer is full.
788 			 * Queue back last skb, and stop aggregating.
789 			 */
790 			wl1271_skb_queue_head(wl, wlvif, skb, hlid);
791 			/* No work left, avoid scheduling redundant tx work */
792 			set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
793 			goto out_ack;
794 		} else if (ret < 0) {
795 			if (wl12xx_is_dummy_packet(wl, skb))
796 				/*
797 				 * fw still expects dummy packet,
798 				 * so re-enqueue it
799 				 */
800 				wl1271_skb_queue_head(wl, wlvif, skb, hlid);
801 			else
802 				ieee80211_free_txskb(wl->hw, skb);
803 			goto out_ack;
804 		}
805 		last_len = ret;
806 		buf_offset += last_len;
807 		wl->tx_packets_count++;
808 		if (has_data) {
809 			desc = (struct wl1271_tx_hw_descr *) skb->data;
810 			__set_bit(desc->hlid, active_hlids);
811 		}
812 	}
813 
814 out_ack:
815 	if (buf_offset) {
816 		buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
817 		bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
818 					     buf_offset, true);
819 		if (bus_ret < 0)
820 			goto out;
821 
822 		sent_packets = true;
823 	}
824 	if (sent_packets) {
825 		/*
826 		 * Interrupt the firmware with the new packets. This is only
827 		 * required for older hardware revisions
828 		 */
829 		if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
830 			bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
831 					     wl->tx_packets_count);
832 			if (bus_ret < 0)
833 				goto out;
834 		}
835 
836 		wl1271_handle_tx_low_watermark(wl);
837 	}
838 	wl12xx_rearm_rx_streaming(wl, active_hlids);
839 
840 out:
841 	return bus_ret;
842 }
843 
844 void wl1271_tx_work(struct work_struct *work)
845 {
846 	struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
847 	int ret;
848 
849 	mutex_lock(&wl->mutex);
850 	ret = wl1271_ps_elp_wakeup(wl);
851 	if (ret < 0)
852 		goto out;
853 
854 	ret = wlcore_tx_work_locked(wl);
855 	if (ret < 0) {
856 		wl12xx_queue_recovery_work(wl);
857 		goto out;
858 	}
859 
860 	wl1271_ps_elp_sleep(wl);
861 out:
862 	mutex_unlock(&wl->mutex);
863 }
864 
865 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
866 {
867 	u8 flags = 0;
868 
869 	/*
870 	 * TODO: use wl12xx constants when this code is moved to wl12xx, as
871 	 * only it uses Tx-completion.
872 	 */
873 	if (rate_class_index <= 8)
874 		flags |= IEEE80211_TX_RC_MCS;
875 
876 	/*
877 	 * TODO: use wl12xx constants when this code is moved to wl12xx, as
878 	 * only it uses Tx-completion.
879 	 */
880 	if (rate_class_index == 0)
881 		flags |= IEEE80211_TX_RC_SHORT_GI;
882 
883 	return flags;
884 }
885 
886 static void wl1271_tx_complete_packet(struct wl1271 *wl,
887 				      struct wl1271_tx_hw_res_descr *result)
888 {
889 	struct ieee80211_tx_info *info;
890 	struct ieee80211_vif *vif;
891 	struct wl12xx_vif *wlvif;
892 	struct sk_buff *skb;
893 	int id = result->id;
894 	int rate = -1;
895 	u8 rate_flags = 0;
896 	u8 retries = 0;
897 
898 	/* check for id legality */
899 	if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
900 		wl1271_warning("TX result illegal id: %d", id);
901 		return;
902 	}
903 
904 	skb = wl->tx_frames[id];
905 	info = IEEE80211_SKB_CB(skb);
906 
907 	if (wl12xx_is_dummy_packet(wl, skb)) {
908 		wl1271_free_tx_id(wl, id);
909 		return;
910 	}
911 
912 	/* info->control is valid as long as we don't update info->status */
913 	vif = info->control.vif;
914 	wlvif = wl12xx_vif_to_data(vif);
915 
916 	/* update the TX status info */
917 	if (result->status == TX_SUCCESS) {
918 		if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
919 			info->flags |= IEEE80211_TX_STAT_ACK;
920 		rate = wlcore_rate_to_idx(wl, result->rate_class_index,
921 					  wlvif->band);
922 		rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
923 		retries = result->ack_failures;
924 	} else if (result->status == TX_RETRY_EXCEEDED) {
925 		wl->stats.excessive_retries++;
926 		retries = result->ack_failures;
927 	}
928 
929 	info->status.rates[0].idx = rate;
930 	info->status.rates[0].count = retries;
931 	info->status.rates[0].flags = rate_flags;
932 	info->status.ack_signal = -1;
933 
934 	wl->stats.retry_count += result->ack_failures;
935 
936 	/* remove private header from packet */
937 	skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
938 
939 	/* remove TKIP header space if present */
940 	if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
941 	    info->control.hw_key &&
942 	    info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
943 		int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
944 		memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
945 			hdrlen);
946 		skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
947 	}
948 
949 	wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
950 		     " status 0x%x",
951 		     result->id, skb, result->ack_failures,
952 		     result->rate_class_index, result->status);
953 
954 	/* return the packet to the stack */
955 	skb_queue_tail(&wl->deferred_tx_queue, skb);
956 	queue_work(wl->freezable_wq, &wl->netstack_work);
957 	wl1271_free_tx_id(wl, result->id);
958 }
959 
960 /* Called upon reception of a TX complete interrupt */
961 int wlcore_tx_complete(struct wl1271 *wl)
962 {
963 	struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
964 	u32 count, fw_counter;
965 	u32 i;
966 	int ret;
967 
968 	/* read the tx results from the chipset */
969 	ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
970 			  wl->tx_res_if, sizeof(*wl->tx_res_if), false);
971 	if (ret < 0)
972 		goto out;
973 
974 	fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
975 
976 	/* write host counter to chipset (to ack) */
977 	ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
978 			     offsetof(struct wl1271_tx_hw_res_if,
979 				      tx_result_host_counter), fw_counter);
980 	if (ret < 0)
981 		goto out;
982 
983 	count = fw_counter - wl->tx_results_count;
984 	wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
985 
986 	/* verify that the result buffer is not getting overrun */
987 	if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
988 		wl1271_warning("TX result overflow from chipset: %d", count);
989 
990 	/* process the results */
991 	for (i = 0; i < count; i++) {
992 		struct wl1271_tx_hw_res_descr *result;
993 		u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
994 
995 		/* process the packet */
996 		result =  &(wl->tx_res_if->tx_results_queue[offset]);
997 		wl1271_tx_complete_packet(wl, result);
998 
999 		wl->tx_results_count++;
1000 	}
1001 
1002 out:
1003 	return ret;
1004 }
1005 EXPORT_SYMBOL(wlcore_tx_complete);
1006 
1007 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
1008 {
1009 	struct sk_buff *skb;
1010 	int i;
1011 	unsigned long flags;
1012 	struct ieee80211_tx_info *info;
1013 	int total[NUM_TX_QUEUES];
1014 	struct wl1271_link *lnk = &wl->links[hlid];
1015 
1016 	for (i = 0; i < NUM_TX_QUEUES; i++) {
1017 		total[i] = 0;
1018 		while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
1019 			wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
1020 
1021 			if (!wl12xx_is_dummy_packet(wl, skb)) {
1022 				info = IEEE80211_SKB_CB(skb);
1023 				info->status.rates[0].idx = -1;
1024 				info->status.rates[0].count = 0;
1025 				ieee80211_tx_status_ni(wl->hw, skb);
1026 			}
1027 
1028 			total[i]++;
1029 		}
1030 	}
1031 
1032 	spin_lock_irqsave(&wl->wl_lock, flags);
1033 	for (i = 0; i < NUM_TX_QUEUES; i++) {
1034 		wl->tx_queue_count[i] -= total[i];
1035 		if (lnk->wlvif)
1036 			lnk->wlvif->tx_queue_count[i] -= total[i];
1037 	}
1038 	spin_unlock_irqrestore(&wl->wl_lock, flags);
1039 
1040 	wl1271_handle_tx_low_watermark(wl);
1041 }
1042 
1043 /* caller must hold wl->mutex and TX must be stopped */
1044 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1045 {
1046 	int i;
1047 
1048 	/* TX failure */
1049 	for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
1050 		if (wlvif->bss_type == BSS_TYPE_AP_BSS &&
1051 		    i != wlvif->ap.bcast_hlid && i != wlvif->ap.global_hlid) {
1052 			/* this calls wl12xx_free_link */
1053 			wl1271_free_sta(wl, wlvif, i);
1054 		} else {
1055 			u8 hlid = i;
1056 			wl12xx_free_link(wl, wlvif, &hlid);
1057 		}
1058 	}
1059 	wlvif->last_tx_hlid = 0;
1060 
1061 	for (i = 0; i < NUM_TX_QUEUES; i++)
1062 		wlvif->tx_queue_count[i] = 0;
1063 }
1064 /* caller must hold wl->mutex and TX must be stopped */
1065 void wl12xx_tx_reset(struct wl1271 *wl)
1066 {
1067 	int i;
1068 	struct sk_buff *skb;
1069 	struct ieee80211_tx_info *info;
1070 
1071 	/* only reset the queues if something bad happened */
1072 	if (wl1271_tx_total_queue_count(wl) != 0) {
1073 		for (i = 0; i < WL12XX_MAX_LINKS; i++)
1074 			wl1271_tx_reset_link_queues(wl, i);
1075 
1076 		for (i = 0; i < NUM_TX_QUEUES; i++)
1077 			wl->tx_queue_count[i] = 0;
1078 	}
1079 
1080 	/*
1081 	 * Make sure the driver is at a consistent state, in case this
1082 	 * function is called from a context other than interface removal.
1083 	 * This call will always wake the TX queues.
1084 	 */
1085 	wl1271_handle_tx_low_watermark(wl);
1086 
1087 	for (i = 0; i < wl->num_tx_desc; i++) {
1088 		if (wl->tx_frames[i] == NULL)
1089 			continue;
1090 
1091 		skb = wl->tx_frames[i];
1092 		wl1271_free_tx_id(wl, i);
1093 		wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1094 
1095 		if (!wl12xx_is_dummy_packet(wl, skb)) {
1096 			/*
1097 			 * Remove private headers before passing the skb to
1098 			 * mac80211
1099 			 */
1100 			info = IEEE80211_SKB_CB(skb);
1101 			skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1102 			if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1103 			    info->control.hw_key &&
1104 			    info->control.hw_key->cipher ==
1105 			    WLAN_CIPHER_SUITE_TKIP) {
1106 				int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1107 				memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1108 					skb->data, hdrlen);
1109 				skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1110 			}
1111 
1112 			info->status.rates[0].idx = -1;
1113 			info->status.rates[0].count = 0;
1114 
1115 			ieee80211_tx_status_ni(wl->hw, skb);
1116 		}
1117 	}
1118 }
1119 
1120 #define WL1271_TX_FLUSH_TIMEOUT 500000
1121 
1122 /* caller must *NOT* hold wl->mutex */
1123 void wl1271_tx_flush(struct wl1271 *wl)
1124 {
1125 	unsigned long timeout, start_time;
1126 	int i;
1127 	start_time = jiffies;
1128 	timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1129 
1130 	/* only one flush should be in progress, for consistent queue state */
1131 	mutex_lock(&wl->flush_mutex);
1132 
1133 	mutex_lock(&wl->mutex);
1134 	if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1135 		mutex_unlock(&wl->mutex);
1136 		goto out;
1137 	}
1138 
1139 	wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1140 
1141 	while (!time_after(jiffies, timeout)) {
1142 		wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1143 			     wl->tx_frames_cnt,
1144 			     wl1271_tx_total_queue_count(wl));
1145 
1146 		/* force Tx and give the driver some time to flush data */
1147 		mutex_unlock(&wl->mutex);
1148 		if (wl1271_tx_total_queue_count(wl))
1149 			wl1271_tx_work(&wl->tx_work);
1150 		msleep(20);
1151 		mutex_lock(&wl->mutex);
1152 
1153 		if ((wl->tx_frames_cnt == 0) &&
1154 		    (wl1271_tx_total_queue_count(wl) == 0)) {
1155 			wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1156 				     jiffies_to_msecs(jiffies - start_time));
1157 			goto out_wake;
1158 		}
1159 	}
1160 
1161 	wl1271_warning("Unable to flush all TX buffers, "
1162 		       "timed out (timeout %d ms",
1163 		       WL1271_TX_FLUSH_TIMEOUT / 1000);
1164 
1165 	/* forcibly flush all Tx buffers on our queues */
1166 	for (i = 0; i < WL12XX_MAX_LINKS; i++)
1167 		wl1271_tx_reset_link_queues(wl, i);
1168 
1169 out_wake:
1170 	wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1171 	mutex_unlock(&wl->mutex);
1172 out:
1173 	mutex_unlock(&wl->flush_mutex);
1174 }
1175 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1176 
1177 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1178 {
1179 	if (WARN_ON(!rate_set))
1180 		return 0;
1181 
1182 	return BIT(__ffs(rate_set));
1183 }
1184 EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1185 
1186 void wlcore_stop_queue_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1187 			      u8 queue, enum wlcore_queue_stop_reason reason)
1188 {
1189 	int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1190 	bool stopped = !!wl->queue_stop_reasons[hwq];
1191 
1192 	/* queue should not be stopped for this reason */
1193 	WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[hwq]));
1194 
1195 	if (stopped)
1196 		return;
1197 
1198 	ieee80211_stop_queue(wl->hw, hwq);
1199 }
1200 
1201 void wlcore_stop_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1202 		       enum wlcore_queue_stop_reason reason)
1203 {
1204 	unsigned long flags;
1205 
1206 	spin_lock_irqsave(&wl->wl_lock, flags);
1207 	wlcore_stop_queue_locked(wl, wlvif, queue, reason);
1208 	spin_unlock_irqrestore(&wl->wl_lock, flags);
1209 }
1210 
1211 void wlcore_wake_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1212 		       enum wlcore_queue_stop_reason reason)
1213 {
1214 	unsigned long flags;
1215 	int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1216 
1217 	spin_lock_irqsave(&wl->wl_lock, flags);
1218 
1219 	/* queue should not be clear for this reason */
1220 	WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[hwq]));
1221 
1222 	if (wl->queue_stop_reasons[hwq])
1223 		goto out;
1224 
1225 	ieee80211_wake_queue(wl->hw, hwq);
1226 
1227 out:
1228 	spin_unlock_irqrestore(&wl->wl_lock, flags);
1229 }
1230 
1231 void wlcore_stop_queues(struct wl1271 *wl,
1232 			enum wlcore_queue_stop_reason reason)
1233 {
1234 	int i;
1235 	unsigned long flags;
1236 
1237 	spin_lock_irqsave(&wl->wl_lock, flags);
1238 
1239 	/* mark all possible queues as stopped */
1240         for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1241                 WARN_ON_ONCE(test_and_set_bit(reason,
1242 					      &wl->queue_stop_reasons[i]));
1243 
1244 	/* use the global version to make sure all vifs in mac80211 we don't
1245 	 * know are stopped.
1246 	 */
1247 	ieee80211_stop_queues(wl->hw);
1248 
1249 	spin_unlock_irqrestore(&wl->wl_lock, flags);
1250 }
1251 
1252 void wlcore_wake_queues(struct wl1271 *wl,
1253 			enum wlcore_queue_stop_reason reason)
1254 {
1255 	int i;
1256 	unsigned long flags;
1257 
1258 	spin_lock_irqsave(&wl->wl_lock, flags);
1259 
1260 	/* mark all possible queues as awake */
1261         for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1262 		WARN_ON_ONCE(!test_and_clear_bit(reason,
1263 						 &wl->queue_stop_reasons[i]));
1264 
1265 	/* use the global version to make sure all vifs in mac80211 we don't
1266 	 * know are woken up.
1267 	 */
1268 	ieee80211_wake_queues(wl->hw);
1269 
1270 	spin_unlock_irqrestore(&wl->wl_lock, flags);
1271 }
1272 
1273 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl,
1274 				       struct wl12xx_vif *wlvif, u8 queue,
1275 				       enum wlcore_queue_stop_reason reason)
1276 {
1277 	unsigned long flags;
1278 	bool stopped;
1279 
1280 	spin_lock_irqsave(&wl->wl_lock, flags);
1281 	stopped = wlcore_is_queue_stopped_by_reason_locked(wl, wlvif, queue,
1282 							   reason);
1283 	spin_unlock_irqrestore(&wl->wl_lock, flags);
1284 
1285 	return stopped;
1286 }
1287 
1288 bool wlcore_is_queue_stopped_by_reason_locked(struct wl1271 *wl,
1289 				       struct wl12xx_vif *wlvif, u8 queue,
1290 				       enum wlcore_queue_stop_reason reason)
1291 {
1292 	int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1293 
1294 	assert_spin_locked(&wl->wl_lock);
1295 	return test_bit(reason, &wl->queue_stop_reasons[hwq]);
1296 }
1297 
1298 bool wlcore_is_queue_stopped_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1299 				    u8 queue)
1300 {
1301 	int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1302 
1303 	assert_spin_locked(&wl->wl_lock);
1304 	return !!wl->queue_stop_reasons[hwq];
1305 }
1306