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/pm_runtime.h>
28 #include <linux/spinlock.h>
29
30 #include "wlcore.h"
31 #include "debug.h"
32 #include "io.h"
33 #include "ps.h"
34 #include "tx.h"
35 #include "event.h"
36 #include "hw_ops.h"
37
38 /*
39 * TODO: this is here just for now, it must be removed when the data
40 * operations are in place.
41 */
42 #include "../wl12xx/reg.h"
43
wl1271_set_default_wep_key(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 id)44 static int wl1271_set_default_wep_key(struct wl1271 *wl,
45 struct wl12xx_vif *wlvif, u8 id)
46 {
47 int ret;
48 bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
49
50 if (is_ap)
51 ret = wl12xx_cmd_set_default_wep_key(wl, id,
52 wlvif->ap.bcast_hlid);
53 else
54 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
55
56 if (ret < 0)
57 return ret;
58
59 wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
60 return 0;
61 }
62
wl1271_alloc_tx_id(struct wl1271 * wl,struct sk_buff * skb)63 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
64 {
65 int id;
66
67 id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc);
68 if (id >= wl->num_tx_desc)
69 return -EBUSY;
70
71 __set_bit(id, wl->tx_frames_map);
72 wl->tx_frames[id] = skb;
73 wl->tx_frames_cnt++;
74 return id;
75 }
76
wl1271_free_tx_id(struct wl1271 * wl,int id)77 void wl1271_free_tx_id(struct wl1271 *wl, int id)
78 {
79 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
80 if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc))
81 clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
82
83 wl->tx_frames[id] = NULL;
84 wl->tx_frames_cnt--;
85 }
86 }
87 EXPORT_SYMBOL(wl1271_free_tx_id);
88
wl1271_tx_ap_update_inconnection_sta(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb)89 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
90 struct wl12xx_vif *wlvif,
91 struct sk_buff *skb)
92 {
93 struct ieee80211_hdr *hdr;
94
95 hdr = (struct ieee80211_hdr *)(skb->data +
96 sizeof(struct wl1271_tx_hw_descr));
97 if (!ieee80211_is_auth(hdr->frame_control))
98 return;
99
100 /*
101 * add the station to the known list before transmitting the
102 * authentication response. this way it won't get de-authed by FW
103 * when transmitting too soon.
104 */
105 wl1271_acx_set_inconnection_sta(wl, wlvif, hdr->addr1);
106
107 /*
108 * ROC for 1 second on the AP channel for completing the connection.
109 * Note the ROC will be continued by the update_sta_state callbacks
110 * once the station reaches the associated state.
111 */
112 wlcore_update_inconn_sta(wl, wlvif, NULL, true);
113 wlvif->pending_auth_reply_time = jiffies;
114 cancel_delayed_work(&wlvif->pending_auth_complete_work);
115 ieee80211_queue_delayed_work(wl->hw,
116 &wlvif->pending_auth_complete_work,
117 msecs_to_jiffies(WLCORE_PEND_AUTH_ROC_TIMEOUT));
118 }
119
wl1271_tx_regulate_link(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 hlid)120 static void wl1271_tx_regulate_link(struct wl1271 *wl,
121 struct wl12xx_vif *wlvif,
122 u8 hlid)
123 {
124 bool fw_ps;
125 u8 tx_pkts;
126
127 if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
128 return;
129
130 fw_ps = test_bit(hlid, &wl->ap_fw_ps_map);
131 tx_pkts = wl->links[hlid].allocated_pkts;
132
133 /*
134 * if in FW PS and there is enough data in FW we can put the link
135 * into high-level PS and clean out its TX queues.
136 * Make an exception if this is the only connected link. In this
137 * case FW-memory congestion is less of a problem.
138 * Note that a single connected STA means 2*ap_count + 1 active links,
139 * since we must account for the global and broadcast AP links
140 * for each AP. The "fw_ps" check assures us the other link is a STA
141 * connected to the AP. Otherwise the FW would not set the PSM bit.
142 */
143 if (wl->active_link_count > (wl->ap_count*2 + 1) && fw_ps &&
144 tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
145 wl12xx_ps_link_start(wl, wlvif, hlid, true);
146 }
147
wl12xx_is_dummy_packet(struct wl1271 * wl,struct sk_buff * skb)148 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
149 {
150 return wl->dummy_packet == skb;
151 }
152 EXPORT_SYMBOL(wl12xx_is_dummy_packet);
153
wl12xx_tx_get_hlid_ap(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,struct ieee80211_sta * sta)154 static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
155 struct sk_buff *skb, struct ieee80211_sta *sta)
156 {
157 if (sta) {
158 struct wl1271_station *wl_sta;
159
160 wl_sta = (struct wl1271_station *)sta->drv_priv;
161 return wl_sta->hlid;
162 } else {
163 struct ieee80211_hdr *hdr;
164
165 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
166 return wl->system_hlid;
167
168 hdr = (struct ieee80211_hdr *)skb->data;
169 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
170 return wlvif->ap.bcast_hlid;
171 else
172 return wlvif->ap.global_hlid;
173 }
174 }
175
wl12xx_tx_get_hlid(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,struct ieee80211_sta * sta)176 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
177 struct sk_buff *skb, struct ieee80211_sta *sta)
178 {
179 struct ieee80211_tx_info *control;
180
181 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
182 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta);
183
184 control = IEEE80211_SKB_CB(skb);
185 if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
186 wl1271_debug(DEBUG_TX, "tx offchannel");
187 return wlvif->dev_hlid;
188 }
189
190 return wlvif->sta.hlid;
191 }
192
wlcore_calc_packet_alignment(struct wl1271 * wl,unsigned int packet_length)193 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
194 unsigned int packet_length)
195 {
196 if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
197 !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
198 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
199 else
200 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
201 }
202 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
203
wl1271_tx_allocate(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u32 extra,u32 buf_offset,u8 hlid,bool is_gem)204 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
205 struct sk_buff *skb, u32 extra, u32 buf_offset,
206 u8 hlid, bool is_gem)
207 {
208 struct wl1271_tx_hw_descr *desc;
209 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
210 u32 total_blocks;
211 int id, ret = -EBUSY, ac;
212 u32 spare_blocks;
213
214 if (buf_offset + total_len > wl->aggr_buf_size)
215 return -EAGAIN;
216
217 spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
218
219 /* allocate free identifier for the packet */
220 id = wl1271_alloc_tx_id(wl, skb);
221 if (id < 0)
222 return id;
223
224 total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
225
226 if (total_blocks <= wl->tx_blocks_available) {
227 desc = skb_push(skb, total_len - skb->len);
228
229 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
230 spare_blocks);
231
232 desc->id = id;
233
234 wl->tx_blocks_available -= total_blocks;
235 wl->tx_allocated_blocks += total_blocks;
236
237 /*
238 * If the FW was empty before, arm the Tx watchdog. Also do
239 * this on the first Tx after resume, as we always cancel the
240 * watchdog on suspend.
241 */
242 if (wl->tx_allocated_blocks == total_blocks ||
243 test_and_clear_bit(WL1271_FLAG_REINIT_TX_WDOG, &wl->flags))
244 wl12xx_rearm_tx_watchdog_locked(wl);
245
246 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
247 wl->tx_allocated_pkts[ac]++;
248
249 if (test_bit(hlid, wl->links_map))
250 wl->links[hlid].allocated_pkts++;
251
252 ret = 0;
253
254 wl1271_debug(DEBUG_TX,
255 "tx_allocate: size: %d, blocks: %d, id: %d",
256 total_len, total_blocks, id);
257 } else {
258 wl1271_free_tx_id(wl, id);
259 }
260
261 return ret;
262 }
263
wl1271_tx_fill_hdr(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u32 extra,struct ieee80211_tx_info * control,u8 hlid)264 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
265 struct sk_buff *skb, u32 extra,
266 struct ieee80211_tx_info *control, u8 hlid)
267 {
268 struct wl1271_tx_hw_descr *desc;
269 int ac, rate_idx;
270 s64 hosttime;
271 u16 tx_attr = 0;
272 __le16 frame_control;
273 struct ieee80211_hdr *hdr;
274 u8 *frame_start;
275 bool is_dummy;
276
277 desc = (struct wl1271_tx_hw_descr *) skb->data;
278 frame_start = (u8 *)(desc + 1);
279 hdr = (struct ieee80211_hdr *)(frame_start + extra);
280 frame_control = hdr->frame_control;
281
282 /* relocate space for security header */
283 if (extra) {
284 int hdrlen = ieee80211_hdrlen(frame_control);
285 memmove(frame_start, hdr, hdrlen);
286 skb_set_network_header(skb, skb_network_offset(skb) + extra);
287 }
288
289 /* configure packet life time */
290 hosttime = (ktime_get_boot_ns() >> 10);
291 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
292
293 is_dummy = wl12xx_is_dummy_packet(wl, skb);
294 if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
295 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
296 else
297 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
298
299 /* queue */
300 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
301 desc->tid = skb->priority;
302
303 if (is_dummy) {
304 /*
305 * FW expects the dummy packet to have an invalid session id -
306 * any session id that is different than the one set in the join
307 */
308 tx_attr = (SESSION_COUNTER_INVALID <<
309 TX_HW_ATTR_OFST_SESSION_COUNTER) &
310 TX_HW_ATTR_SESSION_COUNTER;
311
312 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
313 } else if (wlvif) {
314 u8 session_id = wl->session_ids[hlid];
315
316 if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
317 (wlvif->bss_type == BSS_TYPE_AP_BSS))
318 session_id = 0;
319
320 /* configure the tx attributes */
321 tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
322 }
323
324 desc->hlid = hlid;
325 if (is_dummy || !wlvif)
326 rate_idx = 0;
327 else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
328 /*
329 * if the packets are data packets
330 * send them with AP rate policies (EAPOLs are an exception),
331 * otherwise use default basic rates
332 */
333 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
334 rate_idx = wlvif->sta.basic_rate_idx;
335 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
336 rate_idx = wlvif->sta.p2p_rate_idx;
337 else if (ieee80211_is_data(frame_control))
338 rate_idx = wlvif->sta.ap_rate_idx;
339 else
340 rate_idx = wlvif->sta.basic_rate_idx;
341 } else {
342 if (hlid == wlvif->ap.global_hlid)
343 rate_idx = wlvif->ap.mgmt_rate_idx;
344 else if (hlid == wlvif->ap.bcast_hlid ||
345 skb->protocol == cpu_to_be16(ETH_P_PAE) ||
346 !ieee80211_is_data(frame_control))
347 /*
348 * send non-data, bcast and EAPOLs using the
349 * min basic rate
350 */
351 rate_idx = wlvif->ap.bcast_rate_idx;
352 else
353 rate_idx = wlvif->ap.ucast_rate_idx[ac];
354 }
355
356 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
357
358 /* for WEP shared auth - no fw encryption is needed */
359 if (ieee80211_is_auth(frame_control) &&
360 ieee80211_has_protected(frame_control))
361 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
362
363 /* send EAPOL frames as voice */
364 if (control->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)
365 tx_attr |= TX_HW_ATTR_EAPOL_FRAME;
366
367 desc->tx_attr = cpu_to_le16(tx_attr);
368
369 wlcore_hw_set_tx_desc_csum(wl, desc, skb);
370 wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
371 }
372
373 /* caller must hold wl->mutex */
wl1271_prepare_tx_frame(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u32 buf_offset,u8 hlid)374 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
375 struct sk_buff *skb, u32 buf_offset, u8 hlid)
376 {
377 struct ieee80211_tx_info *info;
378 u32 extra = 0;
379 int ret = 0;
380 u32 total_len;
381 bool is_dummy;
382 bool is_gem = false;
383
384 if (!skb) {
385 wl1271_error("discarding null skb");
386 return -EINVAL;
387 }
388
389 if (hlid == WL12XX_INVALID_LINK_ID) {
390 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
391 return -EINVAL;
392 }
393
394 info = IEEE80211_SKB_CB(skb);
395
396 is_dummy = wl12xx_is_dummy_packet(wl, skb);
397
398 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
399 info->control.hw_key &&
400 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
401 extra = WL1271_EXTRA_SPACE_TKIP;
402
403 if (info->control.hw_key) {
404 bool is_wep;
405 u8 idx = info->control.hw_key->hw_key_idx;
406 u32 cipher = info->control.hw_key->cipher;
407
408 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
409 (cipher == WLAN_CIPHER_SUITE_WEP104);
410
411 if (WARN_ON(is_wep && wlvif && wlvif->default_key != idx)) {
412 ret = wl1271_set_default_wep_key(wl, wlvif, idx);
413 if (ret < 0)
414 return ret;
415 wlvif->default_key = idx;
416 }
417
418 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
419 }
420
421 ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
422 is_gem);
423 if (ret < 0)
424 return ret;
425
426 wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
427
428 if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
429 wl1271_tx_ap_update_inconnection_sta(wl, wlvif, skb);
430 wl1271_tx_regulate_link(wl, wlvif, hlid);
431 }
432
433 /*
434 * The length of each packet is stored in terms of
435 * words. Thus, we must pad the skb data to make sure its
436 * length is aligned. The number of padding bytes is computed
437 * and set in wl1271_tx_fill_hdr.
438 * In special cases, we want to align to a specific block size
439 * (eg. for wl128x with SDIO we align to 256).
440 */
441 total_len = wlcore_calc_packet_alignment(wl, skb->len);
442
443 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
444 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
445
446 /* Revert side effects in the dummy packet skb, so it can be reused */
447 if (is_dummy)
448 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
449
450 return total_len;
451 }
452
wl1271_tx_enabled_rates_get(struct wl1271 * wl,u32 rate_set,enum nl80211_band rate_band)453 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
454 enum nl80211_band rate_band)
455 {
456 struct ieee80211_supported_band *band;
457 u32 enabled_rates = 0;
458 int bit;
459
460 band = wl->hw->wiphy->bands[rate_band];
461 for (bit = 0; bit < band->n_bitrates; bit++) {
462 if (rate_set & 0x1)
463 enabled_rates |= band->bitrates[bit].hw_value;
464 rate_set >>= 1;
465 }
466
467 /* MCS rates indication are on bits 16 - 31 */
468 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
469
470 for (bit = 0; bit < 16; bit++) {
471 if (rate_set & 0x1)
472 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
473 rate_set >>= 1;
474 }
475
476 return enabled_rates;
477 }
478
wl1271_handle_tx_low_watermark(struct wl1271 * wl)479 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
480 {
481 int i;
482 struct wl12xx_vif *wlvif;
483
484 wl12xx_for_each_wlvif(wl, wlvif) {
485 for (i = 0; i < NUM_TX_QUEUES; i++) {
486 if (wlcore_is_queue_stopped_by_reason(wl, wlvif, i,
487 WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
488 wlvif->tx_queue_count[i] <=
489 WL1271_TX_QUEUE_LOW_WATERMARK)
490 /* firmware buffer has space, restart queues */
491 wlcore_wake_queue(wl, wlvif, i,
492 WLCORE_QUEUE_STOP_REASON_WATERMARK);
493 }
494 }
495 }
496
wlcore_select_ac(struct wl1271 * wl)497 static int wlcore_select_ac(struct wl1271 *wl)
498 {
499 int i, q = -1, ac;
500 u32 min_pkts = 0xffffffff;
501
502 /*
503 * Find a non-empty ac where:
504 * 1. There are packets to transmit
505 * 2. The FW has the least allocated blocks
506 *
507 * We prioritize the ACs according to VO>VI>BE>BK
508 */
509 for (i = 0; i < NUM_TX_QUEUES; i++) {
510 ac = wl1271_tx_get_queue(i);
511 if (wl->tx_queue_count[ac] &&
512 wl->tx_allocated_pkts[ac] < min_pkts) {
513 q = ac;
514 min_pkts = wl->tx_allocated_pkts[q];
515 }
516 }
517
518 return q;
519 }
520
wlcore_lnk_dequeue(struct wl1271 * wl,struct wl1271_link * lnk,u8 q)521 static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl,
522 struct wl1271_link *lnk, u8 q)
523 {
524 struct sk_buff *skb;
525 unsigned long flags;
526
527 skb = skb_dequeue(&lnk->tx_queue[q]);
528 if (skb) {
529 spin_lock_irqsave(&wl->wl_lock, flags);
530 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
531 wl->tx_queue_count[q]--;
532 if (lnk->wlvif) {
533 WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0);
534 lnk->wlvif->tx_queue_count[q]--;
535 }
536 spin_unlock_irqrestore(&wl->wl_lock, flags);
537 }
538
539 return skb;
540 }
541
wlcore_lnk_dequeue_high_prio(struct wl1271 * wl,u8 hlid,u8 ac,u8 * low_prio_hlid)542 static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl,
543 u8 hlid, u8 ac,
544 u8 *low_prio_hlid)
545 {
546 struct wl1271_link *lnk = &wl->links[hlid];
547
548 if (!wlcore_hw_lnk_high_prio(wl, hlid, lnk)) {
549 if (*low_prio_hlid == WL12XX_INVALID_LINK_ID &&
550 !skb_queue_empty(&lnk->tx_queue[ac]) &&
551 wlcore_hw_lnk_low_prio(wl, hlid, lnk))
552 /* we found the first non-empty low priority queue */
553 *low_prio_hlid = hlid;
554
555 return NULL;
556 }
557
558 return wlcore_lnk_dequeue(wl, lnk, ac);
559 }
560
wlcore_vif_dequeue_high_prio(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 ac,u8 * hlid,u8 * low_prio_hlid)561 static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl,
562 struct wl12xx_vif *wlvif,
563 u8 ac, u8 *hlid,
564 u8 *low_prio_hlid)
565 {
566 struct sk_buff *skb = NULL;
567 int i, h, start_hlid;
568
569 /* start from the link after the last one */
570 start_hlid = (wlvif->last_tx_hlid + 1) % wl->num_links;
571
572 /* dequeue according to AC, round robin on each link */
573 for (i = 0; i < wl->num_links; i++) {
574 h = (start_hlid + i) % wl->num_links;
575
576 /* only consider connected stations */
577 if (!test_bit(h, wlvif->links_map))
578 continue;
579
580 skb = wlcore_lnk_dequeue_high_prio(wl, h, ac,
581 low_prio_hlid);
582 if (!skb)
583 continue;
584
585 wlvif->last_tx_hlid = h;
586 break;
587 }
588
589 if (!skb)
590 wlvif->last_tx_hlid = 0;
591
592 *hlid = wlvif->last_tx_hlid;
593 return skb;
594 }
595
wl1271_skb_dequeue(struct wl1271 * wl,u8 * hlid)596 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
597 {
598 unsigned long flags;
599 struct wl12xx_vif *wlvif = wl->last_wlvif;
600 struct sk_buff *skb = NULL;
601 int ac;
602 u8 low_prio_hlid = WL12XX_INVALID_LINK_ID;
603
604 ac = wlcore_select_ac(wl);
605 if (ac < 0)
606 goto out;
607
608 /* continue from last wlvif (round robin) */
609 if (wlvif) {
610 wl12xx_for_each_wlvif_continue(wl, wlvif) {
611 if (!wlvif->tx_queue_count[ac])
612 continue;
613
614 skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
615 &low_prio_hlid);
616 if (!skb)
617 continue;
618
619 wl->last_wlvif = wlvif;
620 break;
621 }
622 }
623
624 /* dequeue from the system HLID before the restarting wlvif list */
625 if (!skb) {
626 skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid,
627 ac, &low_prio_hlid);
628 if (skb) {
629 *hlid = wl->system_hlid;
630 wl->last_wlvif = NULL;
631 }
632 }
633
634 /* Do a new pass over the wlvif list. But no need to continue
635 * after last_wlvif. The previous pass should have found it. */
636 if (!skb) {
637 wl12xx_for_each_wlvif(wl, wlvif) {
638 if (!wlvif->tx_queue_count[ac])
639 goto next;
640
641 skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
642 &low_prio_hlid);
643 if (skb) {
644 wl->last_wlvif = wlvif;
645 break;
646 }
647
648 next:
649 if (wlvif == wl->last_wlvif)
650 break;
651 }
652 }
653
654 /* no high priority skbs found - but maybe a low priority one? */
655 if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) {
656 struct wl1271_link *lnk = &wl->links[low_prio_hlid];
657 skb = wlcore_lnk_dequeue(wl, lnk, ac);
658
659 WARN_ON(!skb); /* we checked this before */
660 *hlid = low_prio_hlid;
661
662 /* ensure proper round robin in the vif/link levels */
663 wl->last_wlvif = lnk->wlvif;
664 if (lnk->wlvif)
665 lnk->wlvif->last_tx_hlid = low_prio_hlid;
666
667 }
668
669 out:
670 if (!skb &&
671 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
672 int q;
673
674 skb = wl->dummy_packet;
675 *hlid = wl->system_hlid;
676 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
677 spin_lock_irqsave(&wl->wl_lock, flags);
678 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
679 wl->tx_queue_count[q]--;
680 spin_unlock_irqrestore(&wl->wl_lock, flags);
681 }
682
683 return skb;
684 }
685
wl1271_skb_queue_head(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u8 hlid)686 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
687 struct sk_buff *skb, u8 hlid)
688 {
689 unsigned long flags;
690 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
691
692 if (wl12xx_is_dummy_packet(wl, skb)) {
693 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
694 } else {
695 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
696
697 /* make sure we dequeue the same packet next time */
698 wlvif->last_tx_hlid = (hlid + wl->num_links - 1) %
699 wl->num_links;
700 }
701
702 spin_lock_irqsave(&wl->wl_lock, flags);
703 wl->tx_queue_count[q]++;
704 if (wlvif)
705 wlvif->tx_queue_count[q]++;
706 spin_unlock_irqrestore(&wl->wl_lock, flags);
707 }
708
wl1271_tx_is_data_present(struct sk_buff * skb)709 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
710 {
711 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
712
713 return ieee80211_is_data_present(hdr->frame_control);
714 }
715
wl12xx_rearm_rx_streaming(struct wl1271 * wl,unsigned long * active_hlids)716 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
717 {
718 struct wl12xx_vif *wlvif;
719 u32 timeout;
720 u8 hlid;
721
722 if (!wl->conf.rx_streaming.interval)
723 return;
724
725 if (!wl->conf.rx_streaming.always &&
726 !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
727 return;
728
729 timeout = wl->conf.rx_streaming.duration;
730 wl12xx_for_each_wlvif_sta(wl, wlvif) {
731 bool found = false;
732 for_each_set_bit(hlid, active_hlids, wl->num_links) {
733 if (test_bit(hlid, wlvif->links_map)) {
734 found = true;
735 break;
736 }
737 }
738
739 if (!found)
740 continue;
741
742 /* enable rx streaming */
743 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
744 ieee80211_queue_work(wl->hw,
745 &wlvif->rx_streaming_enable_work);
746
747 mod_timer(&wlvif->rx_streaming_timer,
748 jiffies + msecs_to_jiffies(timeout));
749 }
750 }
751
752 /*
753 * Returns failure values only in case of failed bus ops within this function.
754 * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
755 * triggering recovery by higher layers when not necessary.
756 * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
757 * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
758 * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
759 * within prepare_tx_frame code but there's nothing we should do about those
760 * as well.
761 */
wlcore_tx_work_locked(struct wl1271 * wl)762 int wlcore_tx_work_locked(struct wl1271 *wl)
763 {
764 struct wl12xx_vif *wlvif;
765 struct sk_buff *skb;
766 struct wl1271_tx_hw_descr *desc;
767 u32 buf_offset = 0, last_len = 0;
768 bool sent_packets = false;
769 unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
770 int ret = 0;
771 int bus_ret = 0;
772 u8 hlid;
773
774 if (unlikely(wl->state != WLCORE_STATE_ON))
775 return 0;
776
777 while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
778 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
779 bool has_data = false;
780
781 wlvif = NULL;
782 if (!wl12xx_is_dummy_packet(wl, skb))
783 wlvif = wl12xx_vif_to_data(info->control.vif);
784 else
785 hlid = wl->system_hlid;
786
787 has_data = wlvif && wl1271_tx_is_data_present(skb);
788 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
789 hlid);
790 if (ret == -EAGAIN) {
791 /*
792 * Aggregation buffer is full.
793 * Flush buffer and try again.
794 */
795 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
796
797 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
798 last_len);
799 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
800 wl->aggr_buf, buf_offset, true);
801 if (bus_ret < 0)
802 goto out;
803
804 sent_packets = true;
805 buf_offset = 0;
806 continue;
807 } else if (ret == -EBUSY) {
808 /*
809 * Firmware buffer is full.
810 * Queue back last skb, and stop aggregating.
811 */
812 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
813 /* No work left, avoid scheduling redundant tx work */
814 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
815 goto out_ack;
816 } else if (ret < 0) {
817 if (wl12xx_is_dummy_packet(wl, skb))
818 /*
819 * fw still expects dummy packet,
820 * so re-enqueue it
821 */
822 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
823 else
824 ieee80211_free_txskb(wl->hw, skb);
825 goto out_ack;
826 }
827 last_len = ret;
828 buf_offset += last_len;
829 wl->tx_packets_count++;
830 if (has_data) {
831 desc = (struct wl1271_tx_hw_descr *) skb->data;
832 __set_bit(desc->hlid, active_hlids);
833 }
834 }
835
836 out_ack:
837 if (buf_offset) {
838 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
839 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
840 buf_offset, true);
841 if (bus_ret < 0)
842 goto out;
843
844 sent_packets = true;
845 }
846 if (sent_packets) {
847 /*
848 * Interrupt the firmware with the new packets. This is only
849 * required for older hardware revisions
850 */
851 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
852 bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
853 wl->tx_packets_count);
854 if (bus_ret < 0)
855 goto out;
856 }
857
858 wl1271_handle_tx_low_watermark(wl);
859 }
860 wl12xx_rearm_rx_streaming(wl, active_hlids);
861
862 out:
863 return bus_ret;
864 }
865
wl1271_tx_work(struct work_struct * work)866 void wl1271_tx_work(struct work_struct *work)
867 {
868 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
869 int ret;
870
871 mutex_lock(&wl->mutex);
872 ret = pm_runtime_get_sync(wl->dev);
873 if (ret < 0) {
874 pm_runtime_put_noidle(wl->dev);
875 goto out;
876 }
877
878 ret = wlcore_tx_work_locked(wl);
879 if (ret < 0) {
880 wl12xx_queue_recovery_work(wl);
881 goto out;
882 }
883
884 pm_runtime_mark_last_busy(wl->dev);
885 pm_runtime_put_autosuspend(wl->dev);
886 out:
887 mutex_unlock(&wl->mutex);
888 }
889
wl1271_tx_get_rate_flags(u8 rate_class_index)890 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
891 {
892 u8 flags = 0;
893
894 /*
895 * TODO: use wl12xx constants when this code is moved to wl12xx, as
896 * only it uses Tx-completion.
897 */
898 if (rate_class_index <= 8)
899 flags |= IEEE80211_TX_RC_MCS;
900
901 /*
902 * TODO: use wl12xx constants when this code is moved to wl12xx, as
903 * only it uses Tx-completion.
904 */
905 if (rate_class_index == 0)
906 flags |= IEEE80211_TX_RC_SHORT_GI;
907
908 return flags;
909 }
910
wl1271_tx_complete_packet(struct wl1271 * wl,struct wl1271_tx_hw_res_descr * result)911 static void wl1271_tx_complete_packet(struct wl1271 *wl,
912 struct wl1271_tx_hw_res_descr *result)
913 {
914 struct ieee80211_tx_info *info;
915 struct ieee80211_vif *vif;
916 struct wl12xx_vif *wlvif;
917 struct sk_buff *skb;
918 int id = result->id;
919 int rate = -1;
920 u8 rate_flags = 0;
921 u8 retries = 0;
922
923 /* check for id legality */
924 if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
925 wl1271_warning("TX result illegal id: %d", id);
926 return;
927 }
928
929 skb = wl->tx_frames[id];
930 info = IEEE80211_SKB_CB(skb);
931
932 if (wl12xx_is_dummy_packet(wl, skb)) {
933 wl1271_free_tx_id(wl, id);
934 return;
935 }
936
937 /* info->control is valid as long as we don't update info->status */
938 vif = info->control.vif;
939 wlvif = wl12xx_vif_to_data(vif);
940
941 /* update the TX status info */
942 if (result->status == TX_SUCCESS) {
943 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
944 info->flags |= IEEE80211_TX_STAT_ACK;
945 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
946 wlvif->band);
947 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
948 retries = result->ack_failures;
949 } else if (result->status == TX_RETRY_EXCEEDED) {
950 wl->stats.excessive_retries++;
951 retries = result->ack_failures;
952 }
953
954 info->status.rates[0].idx = rate;
955 info->status.rates[0].count = retries;
956 info->status.rates[0].flags = rate_flags;
957 info->status.ack_signal = -1;
958
959 wl->stats.retry_count += result->ack_failures;
960
961 /* remove private header from packet */
962 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
963
964 /* remove TKIP header space if present */
965 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
966 info->control.hw_key &&
967 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
968 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
969 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
970 hdrlen);
971 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
972 }
973
974 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
975 " status 0x%x",
976 result->id, skb, result->ack_failures,
977 result->rate_class_index, result->status);
978
979 /* return the packet to the stack */
980 skb_queue_tail(&wl->deferred_tx_queue, skb);
981 queue_work(wl->freezable_wq, &wl->netstack_work);
982 wl1271_free_tx_id(wl, result->id);
983 }
984
985 /* Called upon reception of a TX complete interrupt */
wlcore_tx_complete(struct wl1271 * wl)986 int wlcore_tx_complete(struct wl1271 *wl)
987 {
988 struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
989 u32 count, fw_counter;
990 u32 i;
991 int ret;
992
993 /* read the tx results from the chipset */
994 ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
995 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
996 if (ret < 0)
997 goto out;
998
999 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
1000
1001 /* write host counter to chipset (to ack) */
1002 ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
1003 offsetof(struct wl1271_tx_hw_res_if,
1004 tx_result_host_counter), fw_counter);
1005 if (ret < 0)
1006 goto out;
1007
1008 count = fw_counter - wl->tx_results_count;
1009 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
1010
1011 /* verify that the result buffer is not getting overrun */
1012 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
1013 wl1271_warning("TX result overflow from chipset: %d", count);
1014
1015 /* process the results */
1016 for (i = 0; i < count; i++) {
1017 struct wl1271_tx_hw_res_descr *result;
1018 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
1019
1020 /* process the packet */
1021 result = &(wl->tx_res_if->tx_results_queue[offset]);
1022 wl1271_tx_complete_packet(wl, result);
1023
1024 wl->tx_results_count++;
1025 }
1026
1027 out:
1028 return ret;
1029 }
1030 EXPORT_SYMBOL(wlcore_tx_complete);
1031
wl1271_tx_reset_link_queues(struct wl1271 * wl,u8 hlid)1032 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
1033 {
1034 struct sk_buff *skb;
1035 int i;
1036 unsigned long flags;
1037 struct ieee80211_tx_info *info;
1038 int total[NUM_TX_QUEUES];
1039 struct wl1271_link *lnk = &wl->links[hlid];
1040
1041 for (i = 0; i < NUM_TX_QUEUES; i++) {
1042 total[i] = 0;
1043 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
1044 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
1045
1046 if (!wl12xx_is_dummy_packet(wl, skb)) {
1047 info = IEEE80211_SKB_CB(skb);
1048 info->status.rates[0].idx = -1;
1049 info->status.rates[0].count = 0;
1050 ieee80211_tx_status_ni(wl->hw, skb);
1051 }
1052
1053 total[i]++;
1054 }
1055 }
1056
1057 spin_lock_irqsave(&wl->wl_lock, flags);
1058 for (i = 0; i < NUM_TX_QUEUES; i++) {
1059 wl->tx_queue_count[i] -= total[i];
1060 if (lnk->wlvif)
1061 lnk->wlvif->tx_queue_count[i] -= total[i];
1062 }
1063 spin_unlock_irqrestore(&wl->wl_lock, flags);
1064
1065 wl1271_handle_tx_low_watermark(wl);
1066 }
1067
1068 /* caller must hold wl->mutex and TX must be stopped */
wl12xx_tx_reset_wlvif(struct wl1271 * wl,struct wl12xx_vif * wlvif)1069 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1070 {
1071 int i;
1072
1073 /* TX failure */
1074 for_each_set_bit(i, wlvif->links_map, wl->num_links) {
1075 if (wlvif->bss_type == BSS_TYPE_AP_BSS &&
1076 i != wlvif->ap.bcast_hlid && i != wlvif->ap.global_hlid) {
1077 /* this calls wl12xx_free_link */
1078 wl1271_free_sta(wl, wlvif, i);
1079 } else {
1080 u8 hlid = i;
1081 wl12xx_free_link(wl, wlvif, &hlid);
1082 }
1083 }
1084 wlvif->last_tx_hlid = 0;
1085
1086 for (i = 0; i < NUM_TX_QUEUES; i++)
1087 wlvif->tx_queue_count[i] = 0;
1088 }
1089 /* caller must hold wl->mutex and TX must be stopped */
wl12xx_tx_reset(struct wl1271 * wl)1090 void wl12xx_tx_reset(struct wl1271 *wl)
1091 {
1092 int i;
1093 struct sk_buff *skb;
1094 struct ieee80211_tx_info *info;
1095
1096 /* only reset the queues if something bad happened */
1097 if (wl1271_tx_total_queue_count(wl) != 0) {
1098 for (i = 0; i < wl->num_links; i++)
1099 wl1271_tx_reset_link_queues(wl, i);
1100
1101 for (i = 0; i < NUM_TX_QUEUES; i++)
1102 wl->tx_queue_count[i] = 0;
1103 }
1104
1105 /*
1106 * Make sure the driver is at a consistent state, in case this
1107 * function is called from a context other than interface removal.
1108 * This call will always wake the TX queues.
1109 */
1110 wl1271_handle_tx_low_watermark(wl);
1111
1112 for (i = 0; i < wl->num_tx_desc; i++) {
1113 if (wl->tx_frames[i] == NULL)
1114 continue;
1115
1116 skb = wl->tx_frames[i];
1117 wl1271_free_tx_id(wl, i);
1118 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1119
1120 if (!wl12xx_is_dummy_packet(wl, skb)) {
1121 /*
1122 * Remove private headers before passing the skb to
1123 * mac80211
1124 */
1125 info = IEEE80211_SKB_CB(skb);
1126 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1127 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1128 info->control.hw_key &&
1129 info->control.hw_key->cipher ==
1130 WLAN_CIPHER_SUITE_TKIP) {
1131 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1132 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1133 skb->data, hdrlen);
1134 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1135 }
1136
1137 info->status.rates[0].idx = -1;
1138 info->status.rates[0].count = 0;
1139
1140 ieee80211_tx_status_ni(wl->hw, skb);
1141 }
1142 }
1143 }
1144
1145 #define WL1271_TX_FLUSH_TIMEOUT 500000
1146
1147 /* caller must *NOT* hold wl->mutex */
wl1271_tx_flush(struct wl1271 * wl)1148 void wl1271_tx_flush(struct wl1271 *wl)
1149 {
1150 unsigned long timeout, start_time;
1151 int i;
1152 start_time = jiffies;
1153 timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1154
1155 /* only one flush should be in progress, for consistent queue state */
1156 mutex_lock(&wl->flush_mutex);
1157
1158 mutex_lock(&wl->mutex);
1159 if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1160 mutex_unlock(&wl->mutex);
1161 goto out;
1162 }
1163
1164 wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1165
1166 while (!time_after(jiffies, timeout)) {
1167 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1168 wl->tx_frames_cnt,
1169 wl1271_tx_total_queue_count(wl));
1170
1171 /* force Tx and give the driver some time to flush data */
1172 mutex_unlock(&wl->mutex);
1173 if (wl1271_tx_total_queue_count(wl))
1174 wl1271_tx_work(&wl->tx_work);
1175 msleep(20);
1176 mutex_lock(&wl->mutex);
1177
1178 if ((wl->tx_frames_cnt == 0) &&
1179 (wl1271_tx_total_queue_count(wl) == 0)) {
1180 wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1181 jiffies_to_msecs(jiffies - start_time));
1182 goto out_wake;
1183 }
1184 }
1185
1186 wl1271_warning("Unable to flush all TX buffers, "
1187 "timed out (timeout %d ms",
1188 WL1271_TX_FLUSH_TIMEOUT / 1000);
1189
1190 /* forcibly flush all Tx buffers on our queues */
1191 for (i = 0; i < wl->num_links; i++)
1192 wl1271_tx_reset_link_queues(wl, i);
1193
1194 out_wake:
1195 wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1196 mutex_unlock(&wl->mutex);
1197 out:
1198 mutex_unlock(&wl->flush_mutex);
1199 }
1200 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1201
wl1271_tx_min_rate_get(struct wl1271 * wl,u32 rate_set)1202 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1203 {
1204 if (WARN_ON(!rate_set))
1205 return 0;
1206
1207 return BIT(__ffs(rate_set));
1208 }
1209 EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1210
wlcore_stop_queue_locked(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1211 void wlcore_stop_queue_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1212 u8 queue, enum wlcore_queue_stop_reason reason)
1213 {
1214 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1215 bool stopped = !!wl->queue_stop_reasons[hwq];
1216
1217 /* queue should not be stopped for this reason */
1218 WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[hwq]));
1219
1220 if (stopped)
1221 return;
1222
1223 ieee80211_stop_queue(wl->hw, hwq);
1224 }
1225
wlcore_stop_queue(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1226 void wlcore_stop_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1227 enum wlcore_queue_stop_reason reason)
1228 {
1229 unsigned long flags;
1230
1231 spin_lock_irqsave(&wl->wl_lock, flags);
1232 wlcore_stop_queue_locked(wl, wlvif, queue, reason);
1233 spin_unlock_irqrestore(&wl->wl_lock, flags);
1234 }
1235
wlcore_wake_queue(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1236 void wlcore_wake_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1237 enum wlcore_queue_stop_reason reason)
1238 {
1239 unsigned long flags;
1240 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1241
1242 spin_lock_irqsave(&wl->wl_lock, flags);
1243
1244 /* queue should not be clear for this reason */
1245 WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[hwq]));
1246
1247 if (wl->queue_stop_reasons[hwq])
1248 goto out;
1249
1250 ieee80211_wake_queue(wl->hw, hwq);
1251
1252 out:
1253 spin_unlock_irqrestore(&wl->wl_lock, flags);
1254 }
1255
wlcore_stop_queues(struct wl1271 * wl,enum wlcore_queue_stop_reason reason)1256 void wlcore_stop_queues(struct wl1271 *wl,
1257 enum wlcore_queue_stop_reason reason)
1258 {
1259 int i;
1260 unsigned long flags;
1261
1262 spin_lock_irqsave(&wl->wl_lock, flags);
1263
1264 /* mark all possible queues as stopped */
1265 for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1266 WARN_ON_ONCE(test_and_set_bit(reason,
1267 &wl->queue_stop_reasons[i]));
1268
1269 /* use the global version to make sure all vifs in mac80211 we don't
1270 * know are stopped.
1271 */
1272 ieee80211_stop_queues(wl->hw);
1273
1274 spin_unlock_irqrestore(&wl->wl_lock, flags);
1275 }
1276
wlcore_wake_queues(struct wl1271 * wl,enum wlcore_queue_stop_reason reason)1277 void wlcore_wake_queues(struct wl1271 *wl,
1278 enum wlcore_queue_stop_reason reason)
1279 {
1280 int i;
1281 unsigned long flags;
1282
1283 spin_lock_irqsave(&wl->wl_lock, flags);
1284
1285 /* mark all possible queues as awake */
1286 for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1287 WARN_ON_ONCE(!test_and_clear_bit(reason,
1288 &wl->queue_stop_reasons[i]));
1289
1290 /* use the global version to make sure all vifs in mac80211 we don't
1291 * know are woken up.
1292 */
1293 ieee80211_wake_queues(wl->hw);
1294
1295 spin_unlock_irqrestore(&wl->wl_lock, flags);
1296 }
1297
wlcore_is_queue_stopped_by_reason(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1298 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl,
1299 struct wl12xx_vif *wlvif, u8 queue,
1300 enum wlcore_queue_stop_reason reason)
1301 {
1302 unsigned long flags;
1303 bool stopped;
1304
1305 spin_lock_irqsave(&wl->wl_lock, flags);
1306 stopped = wlcore_is_queue_stopped_by_reason_locked(wl, wlvif, queue,
1307 reason);
1308 spin_unlock_irqrestore(&wl->wl_lock, flags);
1309
1310 return stopped;
1311 }
1312
wlcore_is_queue_stopped_by_reason_locked(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1313 bool wlcore_is_queue_stopped_by_reason_locked(struct wl1271 *wl,
1314 struct wl12xx_vif *wlvif, u8 queue,
1315 enum wlcore_queue_stop_reason reason)
1316 {
1317 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1318
1319 assert_spin_locked(&wl->wl_lock);
1320 return test_bit(reason, &wl->queue_stop_reasons[hwq]);
1321 }
1322
wlcore_is_queue_stopped_locked(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue)1323 bool wlcore_is_queue_stopped_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1324 u8 queue)
1325 {
1326 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1327
1328 assert_spin_locked(&wl->wl_lock);
1329 return !!wl->queue_stop_reasons[hwq];
1330 }
1331
