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
wl1271_set_default_wep_key(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 id)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
wl1271_alloc_tx_id(struct wl1271 * wl,struct sk_buff * skb)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
wl1271_free_tx_id(struct wl1271 * wl,int id)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
wl1271_tx_ap_update_inconnection_sta(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb)88 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
89 struct wl12xx_vif *wlvif,
90 struct sk_buff *skb)
91 {
92 struct ieee80211_hdr *hdr;
93
94 hdr = (struct ieee80211_hdr *)(skb->data +
95 sizeof(struct wl1271_tx_hw_descr));
96 if (!ieee80211_is_auth(hdr->frame_control))
97 return;
98
99 /*
100 * add the station to the known list before transmitting the
101 * authentication response. this way it won't get de-authed by FW
102 * when transmitting too soon.
103 */
104 wl1271_acx_set_inconnection_sta(wl, wlvif, hdr->addr1);
105
106 /*
107 * ROC for 1 second on the AP channel for completing the connection.
108 * Note the ROC will be continued by the update_sta_state callbacks
109 * once the station reaches the associated state.
110 */
111 wlcore_update_inconn_sta(wl, wlvif, NULL, true);
112 wlvif->pending_auth_reply_time = jiffies;
113 cancel_delayed_work(&wlvif->pending_auth_complete_work);
114 ieee80211_queue_delayed_work(wl->hw,
115 &wlvif->pending_auth_complete_work,
116 msecs_to_jiffies(WLCORE_PEND_AUTH_ROC_TIMEOUT));
117 }
118
wl1271_tx_regulate_link(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 hlid)119 static void wl1271_tx_regulate_link(struct wl1271 *wl,
120 struct wl12xx_vif *wlvif,
121 u8 hlid)
122 {
123 bool fw_ps;
124 u8 tx_pkts;
125
126 if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
127 return;
128
129 fw_ps = test_bit(hlid, &wl->ap_fw_ps_map);
130 tx_pkts = wl->links[hlid].allocated_pkts;
131
132 /*
133 * if in FW PS and there is enough data in FW we can put the link
134 * into high-level PS and clean out its TX queues.
135 * Make an exception if this is the only connected link. In this
136 * case FW-memory congestion is less of a problem.
137 * Note that a single connected STA means 2*ap_count + 1 active links,
138 * since we must account for the global and broadcast AP links
139 * for each AP. The "fw_ps" check assures us the other link is a STA
140 * connected to the AP. Otherwise the FW would not set the PSM bit.
141 */
142 if (wl->active_link_count > (wl->ap_count*2 + 1) && fw_ps &&
143 tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
144 wl12xx_ps_link_start(wl, wlvif, hlid, true);
145 }
146
wl12xx_is_dummy_packet(struct wl1271 * wl,struct sk_buff * skb)147 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
148 {
149 return wl->dummy_packet == skb;
150 }
151 EXPORT_SYMBOL(wl12xx_is_dummy_packet);
152
wl12xx_tx_get_hlid_ap(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,struct ieee80211_sta * sta)153 static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
154 struct sk_buff *skb, struct ieee80211_sta *sta)
155 {
156 if (sta) {
157 struct wl1271_station *wl_sta;
158
159 wl_sta = (struct wl1271_station *)sta->drv_priv;
160 return wl_sta->hlid;
161 } else {
162 struct ieee80211_hdr *hdr;
163
164 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
165 return wl->system_hlid;
166
167 hdr = (struct ieee80211_hdr *)skb->data;
168 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
169 return wlvif->ap.bcast_hlid;
170 else
171 return wlvif->ap.global_hlid;
172 }
173 }
174
wl12xx_tx_get_hlid(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,struct ieee80211_sta * sta)175 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
176 struct sk_buff *skb, struct ieee80211_sta *sta)
177 {
178 struct ieee80211_tx_info *control;
179
180 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
181 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta);
182
183 control = IEEE80211_SKB_CB(skb);
184 if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
185 wl1271_debug(DEBUG_TX, "tx offchannel");
186 return wlvif->dev_hlid;
187 }
188
189 return wlvif->sta.hlid;
190 }
191
wlcore_calc_packet_alignment(struct wl1271 * wl,unsigned int packet_length)192 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
193 unsigned int packet_length)
194 {
195 if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
196 !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
197 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
198 else
199 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
200 }
201 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
202
wl1271_tx_allocate(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u32 extra,u32 buf_offset,u8 hlid,bool is_gem)203 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
204 struct sk_buff *skb, u32 extra, u32 buf_offset,
205 u8 hlid, bool is_gem)
206 {
207 struct wl1271_tx_hw_descr *desc;
208 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
209 u32 total_blocks;
210 int id, ret = -EBUSY, ac;
211 u32 spare_blocks;
212
213 if (buf_offset + total_len > wl->aggr_buf_size)
214 return -EAGAIN;
215
216 spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
217
218 /* allocate free identifier for the packet */
219 id = wl1271_alloc_tx_id(wl, skb);
220 if (id < 0)
221 return id;
222
223 total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
224
225 if (total_blocks <= wl->tx_blocks_available) {
226 desc = skb_push(skb, total_len - skb->len);
227
228 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
229 spare_blocks);
230
231 desc->id = id;
232
233 wl->tx_blocks_available -= total_blocks;
234 wl->tx_allocated_blocks += total_blocks;
235
236 /*
237 * If the FW was empty before, arm the Tx watchdog. Also do
238 * this on the first Tx after resume, as we always cancel the
239 * watchdog on suspend.
240 */
241 if (wl->tx_allocated_blocks == total_blocks ||
242 test_and_clear_bit(WL1271_FLAG_REINIT_TX_WDOG, &wl->flags))
243 wl12xx_rearm_tx_watchdog_locked(wl);
244
245 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
246 wl->tx_allocated_pkts[ac]++;
247
248 if (test_bit(hlid, wl->links_map))
249 wl->links[hlid].allocated_pkts++;
250
251 ret = 0;
252
253 wl1271_debug(DEBUG_TX,
254 "tx_allocate: size: %d, blocks: %d, id: %d",
255 total_len, total_blocks, id);
256 } else {
257 wl1271_free_tx_id(wl, id);
258 }
259
260 return ret;
261 }
262
wl1271_tx_fill_hdr(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u32 extra,struct ieee80211_tx_info * control,u8 hlid)263 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
264 struct sk_buff *skb, u32 extra,
265 struct ieee80211_tx_info *control, u8 hlid)
266 {
267 struct timespec ts;
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 getnstimeofday(&ts);
291 hosttime = (timespec_to_ns(&ts) >> 10);
292 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
293
294 is_dummy = wl12xx_is_dummy_packet(wl, skb);
295 if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
296 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
297 else
298 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
299
300 /* queue */
301 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
302 desc->tid = skb->priority;
303
304 if (is_dummy) {
305 /*
306 * FW expects the dummy packet to have an invalid session id -
307 * any session id that is different than the one set in the join
308 */
309 tx_attr = (SESSION_COUNTER_INVALID <<
310 TX_HW_ATTR_OFST_SESSION_COUNTER) &
311 TX_HW_ATTR_SESSION_COUNTER;
312
313 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
314 } else if (wlvif) {
315 u8 session_id = wl->session_ids[hlid];
316
317 if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
318 (wlvif->bss_type == BSS_TYPE_AP_BSS))
319 session_id = 0;
320
321 /* configure the tx attributes */
322 tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
323 }
324
325 desc->hlid = hlid;
326 if (is_dummy || !wlvif)
327 rate_idx = 0;
328 else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
329 /*
330 * if the packets are data packets
331 * send them with AP rate policies (EAPOLs are an exception),
332 * otherwise use default basic rates
333 */
334 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
335 rate_idx = wlvif->sta.basic_rate_idx;
336 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
337 rate_idx = wlvif->sta.p2p_rate_idx;
338 else if (ieee80211_is_data(frame_control))
339 rate_idx = wlvif->sta.ap_rate_idx;
340 else
341 rate_idx = wlvif->sta.basic_rate_idx;
342 } else {
343 if (hlid == wlvif->ap.global_hlid)
344 rate_idx = wlvif->ap.mgmt_rate_idx;
345 else if (hlid == wlvif->ap.bcast_hlid ||
346 skb->protocol == cpu_to_be16(ETH_P_PAE) ||
347 !ieee80211_is_data(frame_control))
348 /*
349 * send non-data, bcast and EAPOLs using the
350 * min basic rate
351 */
352 rate_idx = wlvif->ap.bcast_rate_idx;
353 else
354 rate_idx = wlvif->ap.ucast_rate_idx[ac];
355 }
356
357 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
358
359 /* for WEP shared auth - no fw encryption is needed */
360 if (ieee80211_is_auth(frame_control) &&
361 ieee80211_has_protected(frame_control))
362 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
363
364 /* send EAPOL frames as voice */
365 if (control->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)
366 tx_attr |= TX_HW_ATTR_EAPOL_FRAME;
367
368 desc->tx_attr = cpu_to_le16(tx_attr);
369
370 wlcore_hw_set_tx_desc_csum(wl, desc, skb);
371 wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
372 }
373
374 /* 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)375 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
376 struct sk_buff *skb, u32 buf_offset, u8 hlid)
377 {
378 struct ieee80211_tx_info *info;
379 u32 extra = 0;
380 int ret = 0;
381 u32 total_len;
382 bool is_dummy;
383 bool is_gem = false;
384
385 if (!skb) {
386 wl1271_error("discarding null skb");
387 return -EINVAL;
388 }
389
390 if (hlid == WL12XX_INVALID_LINK_ID) {
391 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
392 return -EINVAL;
393 }
394
395 info = IEEE80211_SKB_CB(skb);
396
397 is_dummy = wl12xx_is_dummy_packet(wl, skb);
398
399 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
400 info->control.hw_key &&
401 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
402 extra = WL1271_EXTRA_SPACE_TKIP;
403
404 if (info->control.hw_key) {
405 bool is_wep;
406 u8 idx = info->control.hw_key->hw_key_idx;
407 u32 cipher = info->control.hw_key->cipher;
408
409 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
410 (cipher == WLAN_CIPHER_SUITE_WEP104);
411
412 if (WARN_ON(is_wep && wlvif && wlvif->default_key != idx)) {
413 ret = wl1271_set_default_wep_key(wl, wlvif, idx);
414 if (ret < 0)
415 return ret;
416 wlvif->default_key = idx;
417 }
418
419 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
420 }
421
422 ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
423 is_gem);
424 if (ret < 0)
425 return ret;
426
427 wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
428
429 if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
430 wl1271_tx_ap_update_inconnection_sta(wl, wlvif, skb);
431 wl1271_tx_regulate_link(wl, wlvif, hlid);
432 }
433
434 /*
435 * The length of each packet is stored in terms of
436 * words. Thus, we must pad the skb data to make sure its
437 * length is aligned. The number of padding bytes is computed
438 * and set in wl1271_tx_fill_hdr.
439 * In special cases, we want to align to a specific block size
440 * (eg. for wl128x with SDIO we align to 256).
441 */
442 total_len = wlcore_calc_packet_alignment(wl, skb->len);
443
444 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
445 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
446
447 /* Revert side effects in the dummy packet skb, so it can be reused */
448 if (is_dummy)
449 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
450
451 return total_len;
452 }
453
wl1271_tx_enabled_rates_get(struct wl1271 * wl,u32 rate_set,enum nl80211_band rate_band)454 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
455 enum nl80211_band rate_band)
456 {
457 struct ieee80211_supported_band *band;
458 u32 enabled_rates = 0;
459 int bit;
460
461 band = wl->hw->wiphy->bands[rate_band];
462 for (bit = 0; bit < band->n_bitrates; bit++) {
463 if (rate_set & 0x1)
464 enabled_rates |= band->bitrates[bit].hw_value;
465 rate_set >>= 1;
466 }
467
468 /* MCS rates indication are on bits 16 - 31 */
469 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
470
471 for (bit = 0; bit < 16; bit++) {
472 if (rate_set & 0x1)
473 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
474 rate_set >>= 1;
475 }
476
477 return enabled_rates;
478 }
479
wl1271_handle_tx_low_watermark(struct wl1271 * wl)480 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
481 {
482 int i;
483 struct wl12xx_vif *wlvif;
484
485 wl12xx_for_each_wlvif(wl, wlvif) {
486 for (i = 0; i < NUM_TX_QUEUES; i++) {
487 if (wlcore_is_queue_stopped_by_reason(wl, wlvif, i,
488 WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
489 wlvif->tx_queue_count[i] <=
490 WL1271_TX_QUEUE_LOW_WATERMARK)
491 /* firmware buffer has space, restart queues */
492 wlcore_wake_queue(wl, wlvif, i,
493 WLCORE_QUEUE_STOP_REASON_WATERMARK);
494 }
495 }
496 }
497
wlcore_select_ac(struct wl1271 * wl)498 static int wlcore_select_ac(struct wl1271 *wl)
499 {
500 int i, q = -1, ac;
501 u32 min_pkts = 0xffffffff;
502
503 /*
504 * Find a non-empty ac where:
505 * 1. There are packets to transmit
506 * 2. The FW has the least allocated blocks
507 *
508 * We prioritize the ACs according to VO>VI>BE>BK
509 */
510 for (i = 0; i < NUM_TX_QUEUES; i++) {
511 ac = wl1271_tx_get_queue(i);
512 if (wl->tx_queue_count[ac] &&
513 wl->tx_allocated_pkts[ac] < min_pkts) {
514 q = ac;
515 min_pkts = wl->tx_allocated_pkts[q];
516 }
517 }
518
519 return q;
520 }
521
wlcore_lnk_dequeue(struct wl1271 * wl,struct wl1271_link * lnk,u8 q)522 static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl,
523 struct wl1271_link *lnk, u8 q)
524 {
525 struct sk_buff *skb;
526 unsigned long flags;
527
528 skb = skb_dequeue(&lnk->tx_queue[q]);
529 if (skb) {
530 spin_lock_irqsave(&wl->wl_lock, flags);
531 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
532 wl->tx_queue_count[q]--;
533 if (lnk->wlvif) {
534 WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0);
535 lnk->wlvif->tx_queue_count[q]--;
536 }
537 spin_unlock_irqrestore(&wl->wl_lock, flags);
538 }
539
540 return skb;
541 }
542
wlcore_lnk_dequeue_high_prio(struct wl1271 * wl,u8 hlid,u8 ac,u8 * low_prio_hlid)543 static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl,
544 u8 hlid, u8 ac,
545 u8 *low_prio_hlid)
546 {
547 struct wl1271_link *lnk = &wl->links[hlid];
548
549 if (!wlcore_hw_lnk_high_prio(wl, hlid, lnk)) {
550 if (*low_prio_hlid == WL12XX_INVALID_LINK_ID &&
551 !skb_queue_empty(&lnk->tx_queue[ac]) &&
552 wlcore_hw_lnk_low_prio(wl, hlid, lnk))
553 /* we found the first non-empty low priority queue */
554 *low_prio_hlid = hlid;
555
556 return NULL;
557 }
558
559 return wlcore_lnk_dequeue(wl, lnk, ac);
560 }
561
wlcore_vif_dequeue_high_prio(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 ac,u8 * hlid,u8 * low_prio_hlid)562 static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl,
563 struct wl12xx_vif *wlvif,
564 u8 ac, u8 *hlid,
565 u8 *low_prio_hlid)
566 {
567 struct sk_buff *skb = NULL;
568 int i, h, start_hlid;
569
570 /* start from the link after the last one */
571 start_hlid = (wlvif->last_tx_hlid + 1) % wl->num_links;
572
573 /* dequeue according to AC, round robin on each link */
574 for (i = 0; i < wl->num_links; i++) {
575 h = (start_hlid + i) % wl->num_links;
576
577 /* only consider connected stations */
578 if (!test_bit(h, wlvif->links_map))
579 continue;
580
581 skb = wlcore_lnk_dequeue_high_prio(wl, h, ac,
582 low_prio_hlid);
583 if (!skb)
584 continue;
585
586 wlvif->last_tx_hlid = h;
587 break;
588 }
589
590 if (!skb)
591 wlvif->last_tx_hlid = 0;
592
593 *hlid = wlvif->last_tx_hlid;
594 return skb;
595 }
596
wl1271_skb_dequeue(struct wl1271 * wl,u8 * hlid)597 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
598 {
599 unsigned long flags;
600 struct wl12xx_vif *wlvif = wl->last_wlvif;
601 struct sk_buff *skb = NULL;
602 int ac;
603 u8 low_prio_hlid = WL12XX_INVALID_LINK_ID;
604
605 ac = wlcore_select_ac(wl);
606 if (ac < 0)
607 goto out;
608
609 /* continue from last wlvif (round robin) */
610 if (wlvif) {
611 wl12xx_for_each_wlvif_continue(wl, wlvif) {
612 if (!wlvif->tx_queue_count[ac])
613 continue;
614
615 skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
616 &low_prio_hlid);
617 if (!skb)
618 continue;
619
620 wl->last_wlvif = wlvif;
621 break;
622 }
623 }
624
625 /* dequeue from the system HLID before the restarting wlvif list */
626 if (!skb) {
627 skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid,
628 ac, &low_prio_hlid);
629 if (skb) {
630 *hlid = wl->system_hlid;
631 wl->last_wlvif = NULL;
632 }
633 }
634
635 /* Do a new pass over the wlvif list. But no need to continue
636 * after last_wlvif. The previous pass should have found it. */
637 if (!skb) {
638 wl12xx_for_each_wlvif(wl, wlvif) {
639 if (!wlvif->tx_queue_count[ac])
640 goto next;
641
642 skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
643 &low_prio_hlid);
644 if (skb) {
645 wl->last_wlvif = wlvif;
646 break;
647 }
648
649 next:
650 if (wlvif == wl->last_wlvif)
651 break;
652 }
653 }
654
655 /* no high priority skbs found - but maybe a low priority one? */
656 if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) {
657 struct wl1271_link *lnk = &wl->links[low_prio_hlid];
658 skb = wlcore_lnk_dequeue(wl, lnk, ac);
659
660 WARN_ON(!skb); /* we checked this before */
661 *hlid = low_prio_hlid;
662
663 /* ensure proper round robin in the vif/link levels */
664 wl->last_wlvif = lnk->wlvif;
665 if (lnk->wlvif)
666 lnk->wlvif->last_tx_hlid = low_prio_hlid;
667
668 }
669
670 out:
671 if (!skb &&
672 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
673 int q;
674
675 skb = wl->dummy_packet;
676 *hlid = wl->system_hlid;
677 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
678 spin_lock_irqsave(&wl->wl_lock, flags);
679 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
680 wl->tx_queue_count[q]--;
681 spin_unlock_irqrestore(&wl->wl_lock, flags);
682 }
683
684 return skb;
685 }
686
wl1271_skb_queue_head(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u8 hlid)687 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
688 struct sk_buff *skb, u8 hlid)
689 {
690 unsigned long flags;
691 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
692
693 if (wl12xx_is_dummy_packet(wl, skb)) {
694 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
695 } else {
696 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
697
698 /* make sure we dequeue the same packet next time */
699 wlvif->last_tx_hlid = (hlid + wl->num_links - 1) %
700 wl->num_links;
701 }
702
703 spin_lock_irqsave(&wl->wl_lock, flags);
704 wl->tx_queue_count[q]++;
705 if (wlvif)
706 wlvif->tx_queue_count[q]++;
707 spin_unlock_irqrestore(&wl->wl_lock, flags);
708 }
709
wl1271_tx_is_data_present(struct sk_buff * skb)710 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
711 {
712 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
713
714 return ieee80211_is_data_present(hdr->frame_control);
715 }
716
wl12xx_rearm_rx_streaming(struct wl1271 * wl,unsigned long * active_hlids)717 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
718 {
719 struct wl12xx_vif *wlvif;
720 u32 timeout;
721 u8 hlid;
722
723 if (!wl->conf.rx_streaming.interval)
724 return;
725
726 if (!wl->conf.rx_streaming.always &&
727 !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
728 return;
729
730 timeout = wl->conf.rx_streaming.duration;
731 wl12xx_for_each_wlvif_sta(wl, wlvif) {
732 bool found = false;
733 for_each_set_bit(hlid, active_hlids, wl->num_links) {
734 if (test_bit(hlid, wlvif->links_map)) {
735 found = true;
736 break;
737 }
738 }
739
740 if (!found)
741 continue;
742
743 /* enable rx streaming */
744 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
745 ieee80211_queue_work(wl->hw,
746 &wlvif->rx_streaming_enable_work);
747
748 mod_timer(&wlvif->rx_streaming_timer,
749 jiffies + msecs_to_jiffies(timeout));
750 }
751 }
752
753 /*
754 * Returns failure values only in case of failed bus ops within this function.
755 * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
756 * triggering recovery by higher layers when not necessary.
757 * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
758 * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
759 * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
760 * within prepare_tx_frame code but there's nothing we should do about those
761 * as well.
762 */
wlcore_tx_work_locked(struct wl1271 * wl)763 int wlcore_tx_work_locked(struct wl1271 *wl)
764 {
765 struct wl12xx_vif *wlvif;
766 struct sk_buff *skb;
767 struct wl1271_tx_hw_descr *desc;
768 u32 buf_offset = 0, last_len = 0;
769 bool sent_packets = false;
770 unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
771 int ret = 0;
772 int bus_ret = 0;
773 u8 hlid;
774
775 if (unlikely(wl->state != WLCORE_STATE_ON))
776 return 0;
777
778 while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
779 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
780 bool has_data = false;
781
782 wlvif = NULL;
783 if (!wl12xx_is_dummy_packet(wl, skb))
784 wlvif = wl12xx_vif_to_data(info->control.vif);
785 else
786 hlid = wl->system_hlid;
787
788 has_data = wlvif && wl1271_tx_is_data_present(skb);
789 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
790 hlid);
791 if (ret == -EAGAIN) {
792 /*
793 * Aggregation buffer is full.
794 * Flush buffer and try again.
795 */
796 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
797
798 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
799 last_len);
800 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
801 wl->aggr_buf, buf_offset, true);
802 if (bus_ret < 0)
803 goto out;
804
805 sent_packets = true;
806 buf_offset = 0;
807 continue;
808 } else if (ret == -EBUSY) {
809 /*
810 * Firmware buffer is full.
811 * Queue back last skb, and stop aggregating.
812 */
813 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
814 /* No work left, avoid scheduling redundant tx work */
815 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
816 goto out_ack;
817 } else if (ret < 0) {
818 if (wl12xx_is_dummy_packet(wl, skb))
819 /*
820 * fw still expects dummy packet,
821 * so re-enqueue it
822 */
823 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
824 else
825 ieee80211_free_txskb(wl->hw, skb);
826 goto out_ack;
827 }
828 last_len = ret;
829 buf_offset += last_len;
830 wl->tx_packets_count++;
831 if (has_data) {
832 desc = (struct wl1271_tx_hw_descr *) skb->data;
833 __set_bit(desc->hlid, active_hlids);
834 }
835 }
836
837 out_ack:
838 if (buf_offset) {
839 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
840 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
841 buf_offset, true);
842 if (bus_ret < 0)
843 goto out;
844
845 sent_packets = true;
846 }
847 if (sent_packets) {
848 /*
849 * Interrupt the firmware with the new packets. This is only
850 * required for older hardware revisions
851 */
852 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
853 bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
854 wl->tx_packets_count);
855 if (bus_ret < 0)
856 goto out;
857 }
858
859 wl1271_handle_tx_low_watermark(wl);
860 }
861 wl12xx_rearm_rx_streaming(wl, active_hlids);
862
863 out:
864 return bus_ret;
865 }
866
wl1271_tx_work(struct work_struct * work)867 void wl1271_tx_work(struct work_struct *work)
868 {
869 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
870 int ret;
871
872 mutex_lock(&wl->mutex);
873 ret = wl1271_ps_elp_wakeup(wl);
874 if (ret < 0)
875 goto out;
876
877 ret = wlcore_tx_work_locked(wl);
878 if (ret < 0) {
879 wl12xx_queue_recovery_work(wl);
880 goto out;
881 }
882
883 wl1271_ps_elp_sleep(wl);
884 out:
885 mutex_unlock(&wl->mutex);
886 }
887
wl1271_tx_get_rate_flags(u8 rate_class_index)888 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
889 {
890 u8 flags = 0;
891
892 /*
893 * TODO: use wl12xx constants when this code is moved to wl12xx, as
894 * only it uses Tx-completion.
895 */
896 if (rate_class_index <= 8)
897 flags |= IEEE80211_TX_RC_MCS;
898
899 /*
900 * TODO: use wl12xx constants when this code is moved to wl12xx, as
901 * only it uses Tx-completion.
902 */
903 if (rate_class_index == 0)
904 flags |= IEEE80211_TX_RC_SHORT_GI;
905
906 return flags;
907 }
908
wl1271_tx_complete_packet(struct wl1271 * wl,struct wl1271_tx_hw_res_descr * result)909 static void wl1271_tx_complete_packet(struct wl1271 *wl,
910 struct wl1271_tx_hw_res_descr *result)
911 {
912 struct ieee80211_tx_info *info;
913 struct ieee80211_vif *vif;
914 struct wl12xx_vif *wlvif;
915 struct sk_buff *skb;
916 int id = result->id;
917 int rate = -1;
918 u8 rate_flags = 0;
919 u8 retries = 0;
920
921 /* check for id legality */
922 if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
923 wl1271_warning("TX result illegal id: %d", id);
924 return;
925 }
926
927 skb = wl->tx_frames[id];
928 info = IEEE80211_SKB_CB(skb);
929
930 if (wl12xx_is_dummy_packet(wl, skb)) {
931 wl1271_free_tx_id(wl, id);
932 return;
933 }
934
935 /* info->control is valid as long as we don't update info->status */
936 vif = info->control.vif;
937 wlvif = wl12xx_vif_to_data(vif);
938
939 /* update the TX status info */
940 if (result->status == TX_SUCCESS) {
941 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
942 info->flags |= IEEE80211_TX_STAT_ACK;
943 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
944 wlvif->band);
945 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
946 retries = result->ack_failures;
947 } else if (result->status == TX_RETRY_EXCEEDED) {
948 wl->stats.excessive_retries++;
949 retries = result->ack_failures;
950 }
951
952 info->status.rates[0].idx = rate;
953 info->status.rates[0].count = retries;
954 info->status.rates[0].flags = rate_flags;
955 info->status.ack_signal = -1;
956
957 wl->stats.retry_count += result->ack_failures;
958
959 /* remove private header from packet */
960 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
961
962 /* remove TKIP header space if present */
963 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
964 info->control.hw_key &&
965 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
966 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
967 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
968 hdrlen);
969 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
970 }
971
972 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
973 " status 0x%x",
974 result->id, skb, result->ack_failures,
975 result->rate_class_index, result->status);
976
977 /* return the packet to the stack */
978 skb_queue_tail(&wl->deferred_tx_queue, skb);
979 queue_work(wl->freezable_wq, &wl->netstack_work);
980 wl1271_free_tx_id(wl, result->id);
981 }
982
983 /* Called upon reception of a TX complete interrupt */
wlcore_tx_complete(struct wl1271 * wl)984 int wlcore_tx_complete(struct wl1271 *wl)
985 {
986 struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
987 u32 count, fw_counter;
988 u32 i;
989 int ret;
990
991 /* read the tx results from the chipset */
992 ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
993 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
994 if (ret < 0)
995 goto out;
996
997 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
998
999 /* write host counter to chipset (to ack) */
1000 ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
1001 offsetof(struct wl1271_tx_hw_res_if,
1002 tx_result_host_counter), fw_counter);
1003 if (ret < 0)
1004 goto out;
1005
1006 count = fw_counter - wl->tx_results_count;
1007 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
1008
1009 /* verify that the result buffer is not getting overrun */
1010 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
1011 wl1271_warning("TX result overflow from chipset: %d", count);
1012
1013 /* process the results */
1014 for (i = 0; i < count; i++) {
1015 struct wl1271_tx_hw_res_descr *result;
1016 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
1017
1018 /* process the packet */
1019 result = &(wl->tx_res_if->tx_results_queue[offset]);
1020 wl1271_tx_complete_packet(wl, result);
1021
1022 wl->tx_results_count++;
1023 }
1024
1025 out:
1026 return ret;
1027 }
1028 EXPORT_SYMBOL(wlcore_tx_complete);
1029
wl1271_tx_reset_link_queues(struct wl1271 * wl,u8 hlid)1030 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
1031 {
1032 struct sk_buff *skb;
1033 int i;
1034 unsigned long flags;
1035 struct ieee80211_tx_info *info;
1036 int total[NUM_TX_QUEUES];
1037 struct wl1271_link *lnk = &wl->links[hlid];
1038
1039 for (i = 0; i < NUM_TX_QUEUES; i++) {
1040 total[i] = 0;
1041 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
1042 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
1043
1044 if (!wl12xx_is_dummy_packet(wl, skb)) {
1045 info = IEEE80211_SKB_CB(skb);
1046 info->status.rates[0].idx = -1;
1047 info->status.rates[0].count = 0;
1048 ieee80211_tx_status_ni(wl->hw, skb);
1049 }
1050
1051 total[i]++;
1052 }
1053 }
1054
1055 spin_lock_irqsave(&wl->wl_lock, flags);
1056 for (i = 0; i < NUM_TX_QUEUES; i++) {
1057 wl->tx_queue_count[i] -= total[i];
1058 if (lnk->wlvif)
1059 lnk->wlvif->tx_queue_count[i] -= total[i];
1060 }
1061 spin_unlock_irqrestore(&wl->wl_lock, flags);
1062
1063 wl1271_handle_tx_low_watermark(wl);
1064 }
1065
1066 /* caller must hold wl->mutex and TX must be stopped */
wl12xx_tx_reset_wlvif(struct wl1271 * wl,struct wl12xx_vif * wlvif)1067 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1068 {
1069 int i;
1070
1071 /* TX failure */
1072 for_each_set_bit(i, wlvif->links_map, wl->num_links) {
1073 if (wlvif->bss_type == BSS_TYPE_AP_BSS &&
1074 i != wlvif->ap.bcast_hlid && i != wlvif->ap.global_hlid) {
1075 /* this calls wl12xx_free_link */
1076 wl1271_free_sta(wl, wlvif, i);
1077 } else {
1078 u8 hlid = i;
1079 wl12xx_free_link(wl, wlvif, &hlid);
1080 }
1081 }
1082 wlvif->last_tx_hlid = 0;
1083
1084 for (i = 0; i < NUM_TX_QUEUES; i++)
1085 wlvif->tx_queue_count[i] = 0;
1086 }
1087 /* caller must hold wl->mutex and TX must be stopped */
wl12xx_tx_reset(struct wl1271 * wl)1088 void wl12xx_tx_reset(struct wl1271 *wl)
1089 {
1090 int i;
1091 struct sk_buff *skb;
1092 struct ieee80211_tx_info *info;
1093
1094 /* only reset the queues if something bad happened */
1095 if (wl1271_tx_total_queue_count(wl) != 0) {
1096 for (i = 0; i < wl->num_links; i++)
1097 wl1271_tx_reset_link_queues(wl, i);
1098
1099 for (i = 0; i < NUM_TX_QUEUES; i++)
1100 wl->tx_queue_count[i] = 0;
1101 }
1102
1103 /*
1104 * Make sure the driver is at a consistent state, in case this
1105 * function is called from a context other than interface removal.
1106 * This call will always wake the TX queues.
1107 */
1108 wl1271_handle_tx_low_watermark(wl);
1109
1110 for (i = 0; i < wl->num_tx_desc; i++) {
1111 if (wl->tx_frames[i] == NULL)
1112 continue;
1113
1114 skb = wl->tx_frames[i];
1115 wl1271_free_tx_id(wl, i);
1116 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1117
1118 if (!wl12xx_is_dummy_packet(wl, skb)) {
1119 /*
1120 * Remove private headers before passing the skb to
1121 * mac80211
1122 */
1123 info = IEEE80211_SKB_CB(skb);
1124 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1125 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1126 info->control.hw_key &&
1127 info->control.hw_key->cipher ==
1128 WLAN_CIPHER_SUITE_TKIP) {
1129 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1130 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1131 skb->data, hdrlen);
1132 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1133 }
1134
1135 info->status.rates[0].idx = -1;
1136 info->status.rates[0].count = 0;
1137
1138 ieee80211_tx_status_ni(wl->hw, skb);
1139 }
1140 }
1141 }
1142
1143 #define WL1271_TX_FLUSH_TIMEOUT 500000
1144
1145 /* caller must *NOT* hold wl->mutex */
wl1271_tx_flush(struct wl1271 * wl)1146 void wl1271_tx_flush(struct wl1271 *wl)
1147 {
1148 unsigned long timeout, start_time;
1149 int i;
1150 start_time = jiffies;
1151 timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1152
1153 /* only one flush should be in progress, for consistent queue state */
1154 mutex_lock(&wl->flush_mutex);
1155
1156 mutex_lock(&wl->mutex);
1157 if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1158 mutex_unlock(&wl->mutex);
1159 goto out;
1160 }
1161
1162 wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1163
1164 while (!time_after(jiffies, timeout)) {
1165 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1166 wl->tx_frames_cnt,
1167 wl1271_tx_total_queue_count(wl));
1168
1169 /* force Tx and give the driver some time to flush data */
1170 mutex_unlock(&wl->mutex);
1171 if (wl1271_tx_total_queue_count(wl))
1172 wl1271_tx_work(&wl->tx_work);
1173 msleep(20);
1174 mutex_lock(&wl->mutex);
1175
1176 if ((wl->tx_frames_cnt == 0) &&
1177 (wl1271_tx_total_queue_count(wl) == 0)) {
1178 wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1179 jiffies_to_msecs(jiffies - start_time));
1180 goto out_wake;
1181 }
1182 }
1183
1184 wl1271_warning("Unable to flush all TX buffers, "
1185 "timed out (timeout %d ms",
1186 WL1271_TX_FLUSH_TIMEOUT / 1000);
1187
1188 /* forcibly flush all Tx buffers on our queues */
1189 for (i = 0; i < wl->num_links; i++)
1190 wl1271_tx_reset_link_queues(wl, i);
1191
1192 out_wake:
1193 wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1194 mutex_unlock(&wl->mutex);
1195 out:
1196 mutex_unlock(&wl->flush_mutex);
1197 }
1198 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1199
wl1271_tx_min_rate_get(struct wl1271 * wl,u32 rate_set)1200 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1201 {
1202 if (WARN_ON(!rate_set))
1203 return 0;
1204
1205 return BIT(__ffs(rate_set));
1206 }
1207 EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1208
wlcore_stop_queue_locked(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1209 void wlcore_stop_queue_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1210 u8 queue, enum wlcore_queue_stop_reason reason)
1211 {
1212 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1213 bool stopped = !!wl->queue_stop_reasons[hwq];
1214
1215 /* queue should not be stopped for this reason */
1216 WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[hwq]));
1217
1218 if (stopped)
1219 return;
1220
1221 ieee80211_stop_queue(wl->hw, hwq);
1222 }
1223
wlcore_stop_queue(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1224 void wlcore_stop_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1225 enum wlcore_queue_stop_reason reason)
1226 {
1227 unsigned long flags;
1228
1229 spin_lock_irqsave(&wl->wl_lock, flags);
1230 wlcore_stop_queue_locked(wl, wlvif, queue, reason);
1231 spin_unlock_irqrestore(&wl->wl_lock, flags);
1232 }
1233
wlcore_wake_queue(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1234 void wlcore_wake_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1235 enum wlcore_queue_stop_reason reason)
1236 {
1237 unsigned long flags;
1238 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1239
1240 spin_lock_irqsave(&wl->wl_lock, flags);
1241
1242 /* queue should not be clear for this reason */
1243 WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[hwq]));
1244
1245 if (wl->queue_stop_reasons[hwq])
1246 goto out;
1247
1248 ieee80211_wake_queue(wl->hw, hwq);
1249
1250 out:
1251 spin_unlock_irqrestore(&wl->wl_lock, flags);
1252 }
1253
wlcore_stop_queues(struct wl1271 * wl,enum wlcore_queue_stop_reason reason)1254 void wlcore_stop_queues(struct wl1271 *wl,
1255 enum wlcore_queue_stop_reason reason)
1256 {
1257 int i;
1258 unsigned long flags;
1259
1260 spin_lock_irqsave(&wl->wl_lock, flags);
1261
1262 /* mark all possible queues as stopped */
1263 for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1264 WARN_ON_ONCE(test_and_set_bit(reason,
1265 &wl->queue_stop_reasons[i]));
1266
1267 /* use the global version to make sure all vifs in mac80211 we don't
1268 * know are stopped.
1269 */
1270 ieee80211_stop_queues(wl->hw);
1271
1272 spin_unlock_irqrestore(&wl->wl_lock, flags);
1273 }
1274
wlcore_wake_queues(struct wl1271 * wl,enum wlcore_queue_stop_reason reason)1275 void wlcore_wake_queues(struct wl1271 *wl,
1276 enum wlcore_queue_stop_reason reason)
1277 {
1278 int i;
1279 unsigned long flags;
1280
1281 spin_lock_irqsave(&wl->wl_lock, flags);
1282
1283 /* mark all possible queues as awake */
1284 for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1285 WARN_ON_ONCE(!test_and_clear_bit(reason,
1286 &wl->queue_stop_reasons[i]));
1287
1288 /* use the global version to make sure all vifs in mac80211 we don't
1289 * know are woken up.
1290 */
1291 ieee80211_wake_queues(wl->hw);
1292
1293 spin_unlock_irqrestore(&wl->wl_lock, flags);
1294 }
1295
wlcore_is_queue_stopped_by_reason(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1296 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl,
1297 struct wl12xx_vif *wlvif, u8 queue,
1298 enum wlcore_queue_stop_reason reason)
1299 {
1300 unsigned long flags;
1301 bool stopped;
1302
1303 spin_lock_irqsave(&wl->wl_lock, flags);
1304 stopped = wlcore_is_queue_stopped_by_reason_locked(wl, wlvif, queue,
1305 reason);
1306 spin_unlock_irqrestore(&wl->wl_lock, flags);
1307
1308 return stopped;
1309 }
1310
wlcore_is_queue_stopped_by_reason_locked(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue,enum wlcore_queue_stop_reason reason)1311 bool wlcore_is_queue_stopped_by_reason_locked(struct wl1271 *wl,
1312 struct wl12xx_vif *wlvif, u8 queue,
1313 enum wlcore_queue_stop_reason reason)
1314 {
1315 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1316
1317 assert_spin_locked(&wl->wl_lock);
1318 return test_bit(reason, &wl->queue_stop_reasons[hwq]);
1319 }
1320
wlcore_is_queue_stopped_locked(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 queue)1321 bool wlcore_is_queue_stopped_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1322 u8 queue)
1323 {
1324 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1325
1326 assert_spin_locked(&wl->wl_lock);
1327 return !!wl->queue_stop_reasons[hwq];
1328 }
1329