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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file is part of wl1271
4 *
5 * Copyright (C) 2009 Nokia Corporation
6 *
7 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/etherdevice.h>
13#include <linux/pm_runtime.h>
14#include <linux/spinlock.h>
15
16#include "wlcore.h"
17#include "debug.h"
18#include "io.h"
19#include "ps.h"
20#include "tx.h"
21#include "event.h"
22#include "hw_ops.h"
23
24/*
25 * TODO: this is here just for now, it must be removed when the data
26 * operations are in place.
27 */
28#include "../wl12xx/reg.h"
29
30static int wl1271_set_default_wep_key(struct wl1271 *wl,
31 struct wl12xx_vif *wlvif, u8 id)
32{
33 int ret;
34 bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
35
36 if (is_ap)
37 ret = wl12xx_cmd_set_default_wep_key(wl, id,
38 wlvif->ap.bcast_hlid);
39 else
40 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
41
42 if (ret < 0)
43 return ret;
44
45 wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
46 return 0;
47}
48
49static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
50{
51 int id;
52
53 id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc);
54 if (id >= wl->num_tx_desc)
55 return -EBUSY;
56
57 __set_bit(id, wl->tx_frames_map);
58 wl->tx_frames[id] = skb;
59 wl->tx_frames_cnt++;
60 return id;
61}
62
63void wl1271_free_tx_id(struct wl1271 *wl, int id)
64{
65 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
66 if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc))
67 clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
68
69 wl->tx_frames[id] = NULL;
70 wl->tx_frames_cnt--;
71 }
72}
73EXPORT_SYMBOL(wl1271_free_tx_id);
74
75static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
76 struct wl12xx_vif *wlvif,
77 struct sk_buff *skb)
78{
79 struct ieee80211_hdr *hdr;
80
81 hdr = (struct ieee80211_hdr *)(skb->data +
82 sizeof(struct wl1271_tx_hw_descr));
83 if (!ieee80211_is_auth(hdr->frame_control))
84 return;
85
86 /*
87 * add the station to the known list before transmitting the
88 * authentication response. this way it won't get de-authed by FW
89 * when transmitting too soon.
90 */
91 wl1271_acx_set_inconnection_sta(wl, wlvif, hdr->addr1);
92
93 /*
94 * ROC for 1 second on the AP channel for completing the connection.
95 * Note the ROC will be continued by the update_sta_state callbacks
96 * once the station reaches the associated state.
97 */
98 wlcore_update_inconn_sta(wl, wlvif, NULL, true);
99 wlvif->pending_auth_reply_time = jiffies;
100 cancel_delayed_work(&wlvif->pending_auth_complete_work);
101 ieee80211_queue_delayed_work(wl->hw,
102 &wlvif->pending_auth_complete_work,
103 msecs_to_jiffies(WLCORE_PEND_AUTH_ROC_TIMEOUT));
104}
105
106static void wl1271_tx_regulate_link(struct wl1271 *wl,
107 struct wl12xx_vif *wlvif,
108 u8 hlid)
109{
110 bool fw_ps;
111 u8 tx_pkts;
112
113 if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
114 return;
115
116 fw_ps = test_bit(hlid, &wl->ap_fw_ps_map);
117 tx_pkts = wl->links[hlid].allocated_pkts;
118
119 /*
120 * if in FW PS and there is enough data in FW we can put the link
121 * into high-level PS and clean out its TX queues.
122 * Make an exception if this is the only connected link. In this
123 * case FW-memory congestion is less of a problem.
124 * Note that a single connected STA means 2*ap_count + 1 active links,
125 * since we must account for the global and broadcast AP links
126 * for each AP. The "fw_ps" check assures us the other link is a STA
127 * connected to the AP. Otherwise the FW would not set the PSM bit.
128 */
129 if (wl->active_link_count > (wl->ap_count*2 + 1) && fw_ps &&
130 tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
131 wl12xx_ps_link_start(wl, wlvif, hlid, true);
132}
133
134bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
135{
136 return wl->dummy_packet == skb;
137}
138EXPORT_SYMBOL(wl12xx_is_dummy_packet);
139
140static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
141 struct sk_buff *skb, struct ieee80211_sta *sta)
142{
143 if (sta && wl1271_station(sta)->fw_added) {
144 return wl1271_station(sta)->hlid;
145 } else {
146 struct ieee80211_hdr *hdr;
147
148 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
149 return wl->system_hlid;
150
151 hdr = (struct ieee80211_hdr *)skb->data;
152 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
153 return wlvif->ap.bcast_hlid;
154 else
155 return wlvif->ap.global_hlid;
156 }
157}
158
159u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
160 struct sk_buff *skb, struct ieee80211_sta *sta)
161{
162 struct ieee80211_tx_info *control;
163
164 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
165 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta);
166
167 control = IEEE80211_SKB_CB(skb);
168 if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
169 wl1271_debug(DEBUG_TX, "tx offchannel");
170 return wlvif->dev_hlid;
171 }
172
173 return wlvif->sta.hlid;
174}
175
176unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
177 unsigned int packet_length)
178{
179 if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
180 !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
181 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
182 else
183 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
184}
185EXPORT_SYMBOL(wlcore_calc_packet_alignment);
186
187static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
188 struct sk_buff *skb, u32 extra, u32 buf_offset,
189 u8 hlid, bool is_gem)
190{
191 struct wl1271_tx_hw_descr *desc;
192 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
193 u32 total_blocks;
194 int id, ret = -EBUSY, ac;
195 u32 spare_blocks;
196
197 if (buf_offset + total_len > wl->aggr_buf_size)
198 return -EAGAIN;
199
200 spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
201
202 /* allocate free identifier for the packet */
203 id = wl1271_alloc_tx_id(wl, skb);
204 if (id < 0)
205 return id;
206
207 total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
208
209 if (total_blocks <= wl->tx_blocks_available) {
210 desc = skb_push(skb, total_len - skb->len);
211
212 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
213 spare_blocks);
214
215 desc->id = id;
216
217 wl->tx_blocks_available -= total_blocks;
218 wl->tx_allocated_blocks += total_blocks;
219
220 /*
221 * If the FW was empty before, arm the Tx watchdog. Also do
222 * this on the first Tx after resume, as we always cancel the
223 * watchdog on suspend.
224 */
225 if (wl->tx_allocated_blocks == total_blocks ||
226 test_and_clear_bit(WL1271_FLAG_REINIT_TX_WDOG, &wl->flags))
227 wl12xx_rearm_tx_watchdog_locked(wl);
228
229 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
230 wl->tx_allocated_pkts[ac]++;
231
232 if (test_bit(hlid, wl->links_map))
233 wl->links[hlid].allocated_pkts++;
234
235 ret = 0;
236
237 wl1271_debug(DEBUG_TX,
238 "tx_allocate: size: %d, blocks: %d, id: %d",
239 total_len, total_blocks, id);
240 } else {
241 wl1271_free_tx_id(wl, id);
242 }
243
244 return ret;
245}
246
247static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
248 struct sk_buff *skb, u32 extra,
249 struct ieee80211_tx_info *control, u8 hlid)
250{
251 struct wl1271_tx_hw_descr *desc;
252 int ac, rate_idx;
253 s64 hosttime;
254 u16 tx_attr = 0;
255 __le16 frame_control;
256 struct ieee80211_hdr *hdr;
257 u8 *frame_start;
258 bool is_dummy;
259
260 desc = (struct wl1271_tx_hw_descr *) skb->data;
261 frame_start = (u8 *)(desc + 1);
262 hdr = (struct ieee80211_hdr *)(frame_start + extra);
263 frame_control = hdr->frame_control;
264
265 /* relocate space for security header */
266 if (extra) {
267 int hdrlen = ieee80211_hdrlen(frame_control);
268 memmove(frame_start, hdr, hdrlen);
269 skb_set_network_header(skb, skb_network_offset(skb) + extra);
270 }
271
272 /* configure packet life time */
273 hosttime = (ktime_get_boottime_ns() >> 10);
274 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
275
276 is_dummy = wl12xx_is_dummy_packet(wl, skb);
277 if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
278 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
279 else
280 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
281
282 /* queue */
283 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
284 desc->tid = skb->priority;
285
286 if (is_dummy) {
287 /*
288 * FW expects the dummy packet to have an invalid session id -
289 * any session id that is different than the one set in the join
290 */
291 tx_attr = (SESSION_COUNTER_INVALID <<
292 TX_HW_ATTR_OFST_SESSION_COUNTER) &
293 TX_HW_ATTR_SESSION_COUNTER;
294
295 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
296 } else if (wlvif) {
297 u8 session_id = wl->session_ids[hlid];
298
299 if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
300 (wlvif->bss_type == BSS_TYPE_AP_BSS))
301 session_id = 0;
302
303 /* configure the tx attributes */
304 tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
305 }
306
307 desc->hlid = hlid;
308 if (is_dummy || !wlvif)
309 rate_idx = 0;
310 else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
311 /*
312 * if the packets are data packets
313 * send them with AP rate policies (EAPOLs are an exception),
314 * otherwise use default basic rates
315 */
316 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
317 rate_idx = wlvif->sta.basic_rate_idx;
318 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
319 rate_idx = wlvif->sta.p2p_rate_idx;
320 else if (ieee80211_is_data(frame_control))
321 rate_idx = wlvif->sta.ap_rate_idx;
322 else
323 rate_idx = wlvif->sta.basic_rate_idx;
324 } else {
325 if (hlid == wlvif->ap.global_hlid)
326 rate_idx = wlvif->ap.mgmt_rate_idx;
327 else if (hlid == wlvif->ap.bcast_hlid ||
328 skb->protocol == cpu_to_be16(ETH_P_PAE) ||
329 !ieee80211_is_data(frame_control))
330 /*
331 * send non-data, bcast and EAPOLs using the
332 * min basic rate
333 */
334 rate_idx = wlvif->ap.bcast_rate_idx;
335 else
336 rate_idx = wlvif->ap.ucast_rate_idx[ac];
337 }
338
339 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
340
341 /* for WEP shared auth - no fw encryption is needed */
342 if (ieee80211_is_auth(frame_control) &&
343 ieee80211_has_protected(frame_control))
344 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
345
346 /* send EAPOL frames as voice */
347 if (control->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)
348 tx_attr |= TX_HW_ATTR_EAPOL_FRAME;
349
350 desc->tx_attr = cpu_to_le16(tx_attr);
351
352 wlcore_hw_set_tx_desc_csum(wl, desc, skb);
353 wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
354}
355
356/* caller must hold wl->mutex */
357static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
358 struct sk_buff *skb, u32 buf_offset, u8 hlid)
359{
360 struct ieee80211_tx_info *info;
361 u32 extra = 0;
362 int ret = 0;
363 u32 total_len;
364 bool is_dummy;
365 bool is_gem = false;
366
367 if (!skb) {
368 wl1271_error("discarding null skb");
369 return -EINVAL;
370 }
371
372 if (hlid == WL12XX_INVALID_LINK_ID) {
373 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
374 return -EINVAL;
375 }
376
377 info = IEEE80211_SKB_CB(skb);
378
379 is_dummy = wl12xx_is_dummy_packet(wl, skb);
380
381 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
382 info->control.hw_key &&
383 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
384 extra = WL1271_EXTRA_SPACE_TKIP;
385
386 if (info->control.hw_key) {
387 bool is_wep;
388 u8 idx = info->control.hw_key->hw_key_idx;
389 u32 cipher = info->control.hw_key->cipher;
390
391 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
392 (cipher == WLAN_CIPHER_SUITE_WEP104);
393
394 if (WARN_ON(is_wep && wlvif && wlvif->default_key != idx)) {
395 ret = wl1271_set_default_wep_key(wl, wlvif, idx);
396 if (ret < 0)
397 return ret;
398 wlvif->default_key = idx;
399 }
400
401 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
402 }
403
404 ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
405 is_gem);
406 if (ret < 0)
407 return ret;
408
409 wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
410
411 if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
412 wl1271_tx_ap_update_inconnection_sta(wl, wlvif, skb);
413 wl1271_tx_regulate_link(wl, wlvif, hlid);
414 }
415
416 /*
417 * The length of each packet is stored in terms of
418 * words. Thus, we must pad the skb data to make sure its
419 * length is aligned. The number of padding bytes is computed
420 * and set in wl1271_tx_fill_hdr.
421 * In special cases, we want to align to a specific block size
422 * (eg. for wl128x with SDIO we align to 256).
423 */
424 total_len = wlcore_calc_packet_alignment(wl, skb->len);
425
426 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
427 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
428
429 /* Revert side effects in the dummy packet skb, so it can be reused */
430 if (is_dummy)
431 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
432
433 return total_len;
434}
435
436u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
437 enum nl80211_band rate_band)
438{
439 struct ieee80211_supported_band *band;
440 u32 enabled_rates = 0;
441 int bit;
442
443 band = wl->hw->wiphy->bands[rate_band];
444 for (bit = 0; bit < band->n_bitrates; bit++) {
445 if (rate_set & 0x1)
446 enabled_rates |= band->bitrates[bit].hw_value;
447 rate_set >>= 1;
448 }
449
450 /* MCS rates indication are on bits 16 - 31 */
451 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
452
453 for (bit = 0; bit < 16; bit++) {
454 if (rate_set & 0x1)
455 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
456 rate_set >>= 1;
457 }
458
459 return enabled_rates;
460}
461
462void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
463{
464 int i;
465 struct wl12xx_vif *wlvif;
466
467 wl12xx_for_each_wlvif(wl, wlvif) {
468 for (i = 0; i < NUM_TX_QUEUES; i++) {
469 if (wlcore_is_queue_stopped_by_reason(wl, wlvif, i,
470 WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
471 wlvif->tx_queue_count[i] <=
472 WL1271_TX_QUEUE_LOW_WATERMARK)
473 /* firmware buffer has space, restart queues */
474 wlcore_wake_queue(wl, wlvif, i,
475 WLCORE_QUEUE_STOP_REASON_WATERMARK);
476 }
477 }
478}
479
480static int wlcore_select_ac(struct wl1271 *wl)
481{
482 int i, q = -1, ac;
483 u32 min_pkts = 0xffffffff;
484
485 /*
486 * Find a non-empty ac where:
487 * 1. There are packets to transmit
488 * 2. The FW has the least allocated blocks
489 *
490 * We prioritize the ACs according to VO>VI>BE>BK
491 */
492 for (i = 0; i < NUM_TX_QUEUES; i++) {
493 ac = wl1271_tx_get_queue(i);
494 if (wl->tx_queue_count[ac] &&
495 wl->tx_allocated_pkts[ac] < min_pkts) {
496 q = ac;
497 min_pkts = wl->tx_allocated_pkts[q];
498 }
499 }
500
501 return q;
502}
503
504static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl,
505 struct wl1271_link *lnk, u8 q)
506{
507 struct sk_buff *skb;
508 unsigned long flags;
509
510 skb = skb_dequeue(&lnk->tx_queue[q]);
511 if (skb) {
512 spin_lock_irqsave(&wl->wl_lock, flags);
513 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
514 wl->tx_queue_count[q]--;
515 if (lnk->wlvif) {
516 WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0);
517 lnk->wlvif->tx_queue_count[q]--;
518 }
519 spin_unlock_irqrestore(&wl->wl_lock, flags);
520 }
521
522 return skb;
523}
524
525static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl,
526 u8 hlid, u8 ac,
527 u8 *low_prio_hlid)
528{
529 struct wl1271_link *lnk = &wl->links[hlid];
530
531 if (!wlcore_hw_lnk_high_prio(wl, hlid, lnk)) {
532 if (*low_prio_hlid == WL12XX_INVALID_LINK_ID &&
533 !skb_queue_empty(&lnk->tx_queue[ac]) &&
534 wlcore_hw_lnk_low_prio(wl, hlid, lnk))
535 /* we found the first non-empty low priority queue */
536 *low_prio_hlid = hlid;
537
538 return NULL;
539 }
540
541 return wlcore_lnk_dequeue(wl, lnk, ac);
542}
543
544static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl,
545 struct wl12xx_vif *wlvif,
546 u8 ac, u8 *hlid,
547 u8 *low_prio_hlid)
548{
549 struct sk_buff *skb = NULL;
550 int i, h, start_hlid;
551
552 /* start from the link after the last one */
553 start_hlid = (wlvif->last_tx_hlid + 1) % wl->num_links;
554
555 /* dequeue according to AC, round robin on each link */
556 for (i = 0; i < wl->num_links; i++) {
557 h = (start_hlid + i) % wl->num_links;
558
559 /* only consider connected stations */
560 if (!test_bit(h, wlvif->links_map))
561 continue;
562
563 skb = wlcore_lnk_dequeue_high_prio(wl, h, ac,
564 low_prio_hlid);
565 if (!skb)
566 continue;
567
568 wlvif->last_tx_hlid = h;
569 break;
570 }
571
572 if (!skb)
573 wlvif->last_tx_hlid = 0;
574
575 *hlid = wlvif->last_tx_hlid;
576 return skb;
577}
578
579static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
580{
581 unsigned long flags;
582 struct wl12xx_vif *wlvif = wl->last_wlvif;
583 struct sk_buff *skb = NULL;
584 int ac;
585 u8 low_prio_hlid = WL12XX_INVALID_LINK_ID;
586
587 ac = wlcore_select_ac(wl);
588 if (ac < 0)
589 goto out;
590
591 /* continue from last wlvif (round robin) */
592 if (wlvif) {
593 wl12xx_for_each_wlvif_continue(wl, wlvif) {
594 if (!wlvif->tx_queue_count[ac])
595 continue;
596
597 skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
598 &low_prio_hlid);
599 if (!skb)
600 continue;
601
602 wl->last_wlvif = wlvif;
603 break;
604 }
605 }
606
607 /* dequeue from the system HLID before the restarting wlvif list */
608 if (!skb) {
609 skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid,
610 ac, &low_prio_hlid);
611 if (skb) {
612 *hlid = wl->system_hlid;
613 wl->last_wlvif = NULL;
614 }
615 }
616
617 /* Do a new pass over the wlvif list. But no need to continue
618 * after last_wlvif. The previous pass should have found it. */
619 if (!skb) {
620 wl12xx_for_each_wlvif(wl, wlvif) {
621 if (!wlvif->tx_queue_count[ac])
622 goto next;
623
624 skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
625 &low_prio_hlid);
626 if (skb) {
627 wl->last_wlvif = wlvif;
628 break;
629 }
630
631next:
632 if (wlvif == wl->last_wlvif)
633 break;
634 }
635 }
636
637 /* no high priority skbs found - but maybe a low priority one? */
638 if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) {
639 struct wl1271_link *lnk = &wl->links[low_prio_hlid];
640 skb = wlcore_lnk_dequeue(wl, lnk, ac);
641
642 WARN_ON(!skb); /* we checked this before */
643 *hlid = low_prio_hlid;
644
645 /* ensure proper round robin in the vif/link levels */
646 wl->last_wlvif = lnk->wlvif;
647 if (lnk->wlvif)
648 lnk->wlvif->last_tx_hlid = low_prio_hlid;
649
650 }
651
652out:
653 if (!skb &&
654 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
655 int q;
656
657 skb = wl->dummy_packet;
658 *hlid = wl->system_hlid;
659 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
660 spin_lock_irqsave(&wl->wl_lock, flags);
661 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
662 wl->tx_queue_count[q]--;
663 spin_unlock_irqrestore(&wl->wl_lock, flags);
664 }
665
666 return skb;
667}
668
669static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
670 struct sk_buff *skb, u8 hlid)
671{
672 unsigned long flags;
673 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
674
675 if (wl12xx_is_dummy_packet(wl, skb)) {
676 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
677 } else {
678 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
679
680 /* make sure we dequeue the same packet next time */
681 wlvif->last_tx_hlid = (hlid + wl->num_links - 1) %
682 wl->num_links;
683 }
684
685 spin_lock_irqsave(&wl->wl_lock, flags);
686 wl->tx_queue_count[q]++;
687 if (wlvif)
688 wlvif->tx_queue_count[q]++;
689 spin_unlock_irqrestore(&wl->wl_lock, flags);
690}
691
692static bool wl1271_tx_is_data_present(struct sk_buff *skb)
693{
694 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
695
696 return ieee80211_is_data_present(hdr->frame_control);
697}
698
699void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
700{
701 struct wl12xx_vif *wlvif;
702 u32 timeout;
703 u8 hlid;
704
705 if (!wl->conf.rx_streaming.interval)
706 return;
707
708 if (!wl->conf.rx_streaming.always &&
709 !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
710 return;
711
712 timeout = wl->conf.rx_streaming.duration;
713 wl12xx_for_each_wlvif_sta(wl, wlvif) {
714 bool found = false;
715 for_each_set_bit(hlid, active_hlids, wl->num_links) {
716 if (test_bit(hlid, wlvif->links_map)) {
717 found = true;
718 break;
719 }
720 }
721
722 if (!found)
723 continue;
724
725 /* enable rx streaming */
726 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
727 ieee80211_queue_work(wl->hw,
728 &wlvif->rx_streaming_enable_work);
729
730 mod_timer(&wlvif->rx_streaming_timer,
731 jiffies + msecs_to_jiffies(timeout));
732 }
733}
734
735/*
736 * Returns failure values only in case of failed bus ops within this function.
737 * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
738 * triggering recovery by higher layers when not necessary.
739 * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
740 * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
741 * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
742 * within prepare_tx_frame code but there's nothing we should do about those
743 * as well.
744 */
745int wlcore_tx_work_locked(struct wl1271 *wl)
746{
747 struct wl12xx_vif *wlvif;
748 struct sk_buff *skb;
749 struct wl1271_tx_hw_descr *desc;
750 u32 buf_offset = 0, last_len = 0;
751 bool sent_packets = false;
752 unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
753 int ret = 0;
754 int bus_ret = 0;
755 u8 hlid;
756
757 if (unlikely(wl->state != WLCORE_STATE_ON))
758 return 0;
759
760 while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
761 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
762 bool has_data = false;
763
764 wlvif = NULL;
765 if (!wl12xx_is_dummy_packet(wl, skb))
766 wlvif = wl12xx_vif_to_data(info->control.vif);
767 else
768 hlid = wl->system_hlid;
769
770 has_data = wlvif && wl1271_tx_is_data_present(skb);
771 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
772 hlid);
773 if (ret == -EAGAIN) {
774 /*
775 * Aggregation buffer is full.
776 * Flush buffer and try again.
777 */
778 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
779
780 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
781 last_len);
782 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
783 wl->aggr_buf, buf_offset, true);
784 if (bus_ret < 0)
785 goto out;
786
787 sent_packets = true;
788 buf_offset = 0;
789 continue;
790 } else if (ret == -EBUSY) {
791 /*
792 * Firmware buffer is full.
793 * Queue back last skb, and stop aggregating.
794 */
795 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
796 /* No work left, avoid scheduling redundant tx work */
797 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
798 goto out_ack;
799 } else if (ret < 0) {
800 if (wl12xx_is_dummy_packet(wl, skb))
801 /*
802 * fw still expects dummy packet,
803 * so re-enqueue it
804 */
805 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
806 else
807 ieee80211_free_txskb(wl->hw, skb);
808 goto out_ack;
809 }
810 last_len = ret;
811 buf_offset += last_len;
812 wl->tx_packets_count++;
813 if (has_data) {
814 desc = (struct wl1271_tx_hw_descr *) skb->data;
815 __set_bit(desc->hlid, active_hlids);
816 }
817 }
818
819out_ack:
820 if (buf_offset) {
821 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
822 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
823 buf_offset, true);
824 if (bus_ret < 0)
825 goto out;
826
827 sent_packets = true;
828 }
829 if (sent_packets) {
830 /*
831 * Interrupt the firmware with the new packets. This is only
832 * required for older hardware revisions
833 */
834 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
835 bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
836 wl->tx_packets_count);
837 if (bus_ret < 0)
838 goto out;
839 }
840
841 wl1271_handle_tx_low_watermark(wl);
842 }
843 wl12xx_rearm_rx_streaming(wl, active_hlids);
844
845out:
846 return bus_ret;
847}
848
849void wl1271_tx_work(struct work_struct *work)
850{
851 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
852 int ret;
853
854 mutex_lock(&wl->mutex);
855 ret = pm_runtime_resume_and_get(wl->dev);
856 if (ret < 0)
857 goto out;
858
859 ret = wlcore_tx_work_locked(wl);
860 if (ret < 0) {
861 pm_runtime_put_noidle(wl->dev);
862 wl12xx_queue_recovery_work(wl);
863 goto out;
864 }
865
866 pm_runtime_mark_last_busy(wl->dev);
867 pm_runtime_put_autosuspend(wl->dev);
868out:
869 mutex_unlock(&wl->mutex);
870}
871
872static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
873{
874 u8 flags = 0;
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 <= 8)
881 flags |= IEEE80211_TX_RC_MCS;
882
883 /*
884 * TODO: use wl12xx constants when this code is moved to wl12xx, as
885 * only it uses Tx-completion.
886 */
887 if (rate_class_index == 0)
888 flags |= IEEE80211_TX_RC_SHORT_GI;
889
890 return flags;
891}
892
893static void wl1271_tx_complete_packet(struct wl1271 *wl,
894 struct wl1271_tx_hw_res_descr *result)
895{
896 struct ieee80211_tx_info *info;
897 struct ieee80211_vif *vif;
898 struct wl12xx_vif *wlvif;
899 struct sk_buff *skb;
900 int id = result->id;
901 int rate = -1;
902 u8 rate_flags = 0;
903 u8 retries = 0;
904
905 /* check for id legality */
906 if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
907 wl1271_warning("TX result illegal id: %d", id);
908 return;
909 }
910
911 skb = wl->tx_frames[id];
912 info = IEEE80211_SKB_CB(skb);
913
914 if (wl12xx_is_dummy_packet(wl, skb)) {
915 wl1271_free_tx_id(wl, id);
916 return;
917 }
918
919 /* info->control is valid as long as we don't update info->status */
920 vif = info->control.vif;
921 wlvif = wl12xx_vif_to_data(vif);
922
923 /* update the TX status info */
924 if (result->status == TX_SUCCESS) {
925 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
926 info->flags |= IEEE80211_TX_STAT_ACK;
927 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
928 wlvif->band);
929 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
930 retries = result->ack_failures;
931 } else if (result->status == TX_RETRY_EXCEEDED) {
932 wl->stats.excessive_retries++;
933 retries = result->ack_failures;
934 }
935
936 info->status.rates[0].idx = rate;
937 info->status.rates[0].count = retries;
938 info->status.rates[0].flags = rate_flags;
939 info->status.ack_signal = -1;
940
941 wl->stats.retry_count += result->ack_failures;
942
943 /* remove private header from packet */
944 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
945
946 /* remove TKIP header space if present */
947 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
948 info->control.hw_key &&
949 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
950 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
951 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
952 hdrlen);
953 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
954 }
955
956 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
957 " status 0x%x",
958 result->id, skb, result->ack_failures,
959 result->rate_class_index, result->status);
960
961 /* return the packet to the stack */
962 skb_queue_tail(&wl->deferred_tx_queue, skb);
963 queue_work(wl->freezable_wq, &wl->netstack_work);
964 wl1271_free_tx_id(wl, result->id);
965}
966
967/* Called upon reception of a TX complete interrupt */
968int wlcore_tx_complete(struct wl1271 *wl)
969{
970 struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
971 u32 count, fw_counter;
972 u32 i;
973 int ret;
974
975 /* read the tx results from the chipset */
976 ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
977 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
978 if (ret < 0)
979 goto out;
980
981 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
982
983 /* write host counter to chipset (to ack) */
984 ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
985 offsetof(struct wl1271_tx_hw_res_if,
986 tx_result_host_counter), fw_counter);
987 if (ret < 0)
988 goto out;
989
990 count = fw_counter - wl->tx_results_count;
991 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
992
993 /* verify that the result buffer is not getting overrun */
994 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
995 wl1271_warning("TX result overflow from chipset: %d", count);
996
997 /* process the results */
998 for (i = 0; i < count; i++) {
999 struct wl1271_tx_hw_res_descr *result;
1000 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
1001
1002 /* process the packet */
1003 result = &(wl->tx_res_if->tx_results_queue[offset]);
1004 wl1271_tx_complete_packet(wl, result);
1005
1006 wl->tx_results_count++;
1007 }
1008
1009out:
1010 return ret;
1011}
1012EXPORT_SYMBOL(wlcore_tx_complete);
1013
1014void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
1015{
1016 struct sk_buff *skb;
1017 int i;
1018 unsigned long flags;
1019 struct ieee80211_tx_info *info;
1020 int total[NUM_TX_QUEUES];
1021 struct wl1271_link *lnk = &wl->links[hlid];
1022
1023 for (i = 0; i < NUM_TX_QUEUES; i++) {
1024 total[i] = 0;
1025 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
1026 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
1027
1028 if (!wl12xx_is_dummy_packet(wl, skb)) {
1029 info = IEEE80211_SKB_CB(skb);
1030 info->status.rates[0].idx = -1;
1031 info->status.rates[0].count = 0;
1032 ieee80211_tx_status_ni(wl->hw, skb);
1033 }
1034
1035 total[i]++;
1036 }
1037 }
1038
1039 spin_lock_irqsave(&wl->wl_lock, flags);
1040 for (i = 0; i < NUM_TX_QUEUES; i++) {
1041 wl->tx_queue_count[i] -= total[i];
1042 if (lnk->wlvif)
1043 lnk->wlvif->tx_queue_count[i] -= total[i];
1044 }
1045 spin_unlock_irqrestore(&wl->wl_lock, flags);
1046
1047 wl1271_handle_tx_low_watermark(wl);
1048}
1049
1050/* caller must hold wl->mutex and TX must be stopped */
1051void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1052{
1053 int i;
1054
1055 /* TX failure */
1056 for_each_set_bit(i, wlvif->links_map, wl->num_links) {
1057 if (wlvif->bss_type == BSS_TYPE_AP_BSS &&
1058 i != wlvif->ap.bcast_hlid && i != wlvif->ap.global_hlid) {
1059 /* this calls wl12xx_free_link */
1060 wl1271_free_sta(wl, wlvif, i);
1061 } else {
1062 u8 hlid = i;
1063 wl12xx_free_link(wl, wlvif, &hlid);
1064 }
1065 }
1066 wlvif->last_tx_hlid = 0;
1067
1068 for (i = 0; i < NUM_TX_QUEUES; i++)
1069 wlvif->tx_queue_count[i] = 0;
1070}
1071/* caller must hold wl->mutex and TX must be stopped */
1072void wl12xx_tx_reset(struct wl1271 *wl)
1073{
1074 int i;
1075 struct sk_buff *skb;
1076 struct ieee80211_tx_info *info;
1077
1078 /* only reset the queues if something bad happened */
1079 if (wl1271_tx_total_queue_count(wl) != 0) {
1080 for (i = 0; i < wl->num_links; i++)
1081 wl1271_tx_reset_link_queues(wl, i);
1082
1083 for (i = 0; i < NUM_TX_QUEUES; i++)
1084 wl->tx_queue_count[i] = 0;
1085 }
1086
1087 /*
1088 * Make sure the driver is at a consistent state, in case this
1089 * function is called from a context other than interface removal.
1090 * This call will always wake the TX queues.
1091 */
1092 wl1271_handle_tx_low_watermark(wl);
1093
1094 for (i = 0; i < wl->num_tx_desc; i++) {
1095 if (wl->tx_frames[i] == NULL)
1096 continue;
1097
1098 skb = wl->tx_frames[i];
1099 wl1271_free_tx_id(wl, i);
1100 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1101
1102 if (!wl12xx_is_dummy_packet(wl, skb)) {
1103 /*
1104 * Remove private headers before passing the skb to
1105 * mac80211
1106 */
1107 info = IEEE80211_SKB_CB(skb);
1108 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1109 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1110 info->control.hw_key &&
1111 info->control.hw_key->cipher ==
1112 WLAN_CIPHER_SUITE_TKIP) {
1113 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1114 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1115 skb->data, hdrlen);
1116 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1117 }
1118
1119 info->status.rates[0].idx = -1;
1120 info->status.rates[0].count = 0;
1121
1122 ieee80211_tx_status_ni(wl->hw, skb);
1123 }
1124 }
1125}
1126
1127#define WL1271_TX_FLUSH_TIMEOUT 500000
1128
1129/* caller must *NOT* hold wl->mutex */
1130void wl1271_tx_flush(struct wl1271 *wl)
1131{
1132 unsigned long timeout, start_time;
1133 int i;
1134 start_time = jiffies;
1135 timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1136
1137 /* only one flush should be in progress, for consistent queue state */
1138 mutex_lock(&wl->flush_mutex);
1139
1140 mutex_lock(&wl->mutex);
1141 if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1142 mutex_unlock(&wl->mutex);
1143 goto out;
1144 }
1145
1146 wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1147
1148 while (!time_after(jiffies, timeout)) {
1149 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1150 wl->tx_frames_cnt,
1151 wl1271_tx_total_queue_count(wl));
1152
1153 /* force Tx and give the driver some time to flush data */
1154 mutex_unlock(&wl->mutex);
1155 if (wl1271_tx_total_queue_count(wl))
1156 wl1271_tx_work(&wl->tx_work);
1157 msleep(20);
1158 mutex_lock(&wl->mutex);
1159
1160 if ((wl->tx_frames_cnt == 0) &&
1161 (wl1271_tx_total_queue_count(wl) == 0)) {
1162 wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1163 jiffies_to_msecs(jiffies - start_time));
1164 goto out_wake;
1165 }
1166 }
1167
1168 wl1271_warning("Unable to flush all TX buffers, "
1169 "timed out (timeout %d ms",
1170 WL1271_TX_FLUSH_TIMEOUT / 1000);
1171
1172 /* forcibly flush all Tx buffers on our queues */
1173 for (i = 0; i < wl->num_links; i++)
1174 wl1271_tx_reset_link_queues(wl, i);
1175
1176out_wake:
1177 wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1178 mutex_unlock(&wl->mutex);
1179out:
1180 mutex_unlock(&wl->flush_mutex);
1181}
1182EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1183
1184u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1185{
1186 if (WARN_ON(!rate_set))
1187 return 0;
1188
1189 return BIT(__ffs(rate_set));
1190}
1191EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1192
1193void wlcore_stop_queue_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1194 u8 queue, enum wlcore_queue_stop_reason reason)
1195{
1196 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1197 bool stopped = !!wl->queue_stop_reasons[hwq];
1198
1199 /* queue should not be stopped for this reason */
1200 WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[hwq]));
1201
1202 if (stopped)
1203 return;
1204
1205 ieee80211_stop_queue(wl->hw, hwq);
1206}
1207
1208void wlcore_stop_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1209 enum wlcore_queue_stop_reason reason)
1210{
1211 unsigned long flags;
1212
1213 spin_lock_irqsave(&wl->wl_lock, flags);
1214 wlcore_stop_queue_locked(wl, wlvif, queue, reason);
1215 spin_unlock_irqrestore(&wl->wl_lock, flags);
1216}
1217
1218void wlcore_wake_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1219 enum wlcore_queue_stop_reason reason)
1220{
1221 unsigned long flags;
1222 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1223
1224 spin_lock_irqsave(&wl->wl_lock, flags);
1225
1226 /* queue should not be clear for this reason */
1227 WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[hwq]));
1228
1229 if (wl->queue_stop_reasons[hwq])
1230 goto out;
1231
1232 ieee80211_wake_queue(wl->hw, hwq);
1233
1234out:
1235 spin_unlock_irqrestore(&wl->wl_lock, flags);
1236}
1237
1238void wlcore_stop_queues(struct wl1271 *wl,
1239 enum wlcore_queue_stop_reason reason)
1240{
1241 int i;
1242 unsigned long flags;
1243
1244 spin_lock_irqsave(&wl->wl_lock, flags);
1245
1246 /* mark all possible queues as stopped */
1247 for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1248 WARN_ON_ONCE(test_and_set_bit(reason,
1249 &wl->queue_stop_reasons[i]));
1250
1251 /* use the global version to make sure all vifs in mac80211 we don't
1252 * know are stopped.
1253 */
1254 ieee80211_stop_queues(wl->hw);
1255
1256 spin_unlock_irqrestore(&wl->wl_lock, flags);
1257}
1258
1259void wlcore_wake_queues(struct wl1271 *wl,
1260 enum wlcore_queue_stop_reason reason)
1261{
1262 int i;
1263 unsigned long flags;
1264
1265 spin_lock_irqsave(&wl->wl_lock, flags);
1266
1267 /* mark all possible queues as awake */
1268 for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1269 WARN_ON_ONCE(!test_and_clear_bit(reason,
1270 &wl->queue_stop_reasons[i]));
1271
1272 /* use the global version to make sure all vifs in mac80211 we don't
1273 * know are woken up.
1274 */
1275 ieee80211_wake_queues(wl->hw);
1276
1277 spin_unlock_irqrestore(&wl->wl_lock, flags);
1278}
1279
1280bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl,
1281 struct wl12xx_vif *wlvif, u8 queue,
1282 enum wlcore_queue_stop_reason reason)
1283{
1284 unsigned long flags;
1285 bool stopped;
1286
1287 spin_lock_irqsave(&wl->wl_lock, flags);
1288 stopped = wlcore_is_queue_stopped_by_reason_locked(wl, wlvif, queue,
1289 reason);
1290 spin_unlock_irqrestore(&wl->wl_lock, flags);
1291
1292 return stopped;
1293}
1294
1295bool wlcore_is_queue_stopped_by_reason_locked(struct wl1271 *wl,
1296 struct wl12xx_vif *wlvif, u8 queue,
1297 enum wlcore_queue_stop_reason reason)
1298{
1299 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1300
1301 assert_spin_locked(&wl->wl_lock);
1302 return test_bit(reason, &wl->queue_stop_reasons[hwq]);
1303}
1304
1305bool wlcore_is_queue_stopped_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1306 u8 queue)
1307{
1308 int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1309
1310 assert_spin_locked(&wl->wl_lock);
1311 return !!wl->queue_stop_reasons[hwq];
1312}
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
28#include "wlcore.h"
29#include "debug.h"
30#include "io.h"
31#include "ps.h"
32#include "tx.h"
33#include "event.h"
34#include "hw_ops.h"
35
36/*
37 * TODO: this is here just for now, it must be removed when the data
38 * operations are in place.
39 */
40#include "../wl12xx/reg.h"
41
42static int wl1271_set_default_wep_key(struct wl1271 *wl,
43 struct wl12xx_vif *wlvif, u8 id)
44{
45 int ret;
46 bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
47
48 if (is_ap)
49 ret = wl12xx_cmd_set_default_wep_key(wl, id,
50 wlvif->ap.bcast_hlid);
51 else
52 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
53
54 if (ret < 0)
55 return ret;
56
57 wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
58 return 0;
59}
60
61static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
62{
63 int id;
64
65 id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc);
66 if (id >= wl->num_tx_desc)
67 return -EBUSY;
68
69 __set_bit(id, wl->tx_frames_map);
70 wl->tx_frames[id] = skb;
71 wl->tx_frames_cnt++;
72 return id;
73}
74
75static void wl1271_free_tx_id(struct wl1271 *wl, int id)
76{
77 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
78 if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc))
79 clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
80
81 wl->tx_frames[id] = NULL;
82 wl->tx_frames_cnt--;
83 }
84}
85
86static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
87 struct sk_buff *skb)
88{
89 struct ieee80211_hdr *hdr;
90
91 /*
92 * add the station to the known list before transmitting the
93 * authentication response. this way it won't get de-authed by FW
94 * when transmitting too soon.
95 */
96 hdr = (struct ieee80211_hdr *)(skb->data +
97 sizeof(struct wl1271_tx_hw_descr));
98 if (ieee80211_is_auth(hdr->frame_control))
99 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
100}
101
102static void wl1271_tx_regulate_link(struct wl1271 *wl,
103 struct wl12xx_vif *wlvif,
104 u8 hlid)
105{
106 bool fw_ps, single_sta;
107 u8 tx_pkts;
108
109 if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
110 return;
111
112 fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
113 tx_pkts = wl->links[hlid].allocated_pkts;
114 single_sta = (wl->active_sta_count == 1);
115
116 /*
117 * if in FW PS and there is enough data in FW we can put the link
118 * into high-level PS and clean out its TX queues.
119 * Make an exception if this is the only connected station. In this
120 * case FW-memory congestion is not a problem.
121 */
122 if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
123 wl12xx_ps_link_start(wl, wlvif, hlid, true);
124}
125
126bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
127{
128 return wl->dummy_packet == skb;
129}
130
131u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
132 struct sk_buff *skb)
133{
134 struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
135
136 if (control->control.sta) {
137 struct wl1271_station *wl_sta;
138
139 wl_sta = (struct wl1271_station *)
140 control->control.sta->drv_priv;
141 return wl_sta->hlid;
142 } else {
143 struct ieee80211_hdr *hdr;
144
145 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
146 return wl->system_hlid;
147
148 hdr = (struct ieee80211_hdr *)skb->data;
149 if (ieee80211_is_mgmt(hdr->frame_control))
150 return wlvif->ap.global_hlid;
151 else
152 return wlvif->ap.bcast_hlid;
153 }
154}
155
156u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
157 struct sk_buff *skb)
158{
159 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
160
161 if (!wlvif || wl12xx_is_dummy_packet(wl, skb))
162 return wl->system_hlid;
163
164 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
165 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb);
166
167 if ((test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags) ||
168 test_bit(WLVIF_FLAG_IBSS_JOINED, &wlvif->flags)) &&
169 !ieee80211_is_auth(hdr->frame_control) &&
170 !ieee80211_is_assoc_req(hdr->frame_control))
171 return wlvif->sta.hlid;
172 else
173 return wlvif->dev_hlid;
174}
175
176unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
177 unsigned int packet_length)
178{
179 if (wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN)
180 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
181 else
182 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
183}
184EXPORT_SYMBOL(wlcore_calc_packet_alignment);
185
186static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
187 struct sk_buff *skb, u32 extra, u32 buf_offset,
188 u8 hlid)
189{
190 struct wl1271_tx_hw_descr *desc;
191 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
192 u32 total_blocks;
193 int id, ret = -EBUSY, ac;
194 u32 spare_blocks = wl->normal_tx_spare;
195 bool is_dummy = false;
196
197 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
198 return -EAGAIN;
199
200 /* allocate free identifier for the packet */
201 id = wl1271_alloc_tx_id(wl, skb);
202 if (id < 0)
203 return id;
204
205 if (unlikely(wl12xx_is_dummy_packet(wl, skb)))
206 is_dummy = true;
207 else if (wlvif->is_gem)
208 spare_blocks = wl->gem_tx_spare;
209
210 total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
211
212 if (total_blocks <= wl->tx_blocks_available) {
213 desc = (struct wl1271_tx_hw_descr *)skb_push(
214 skb, total_len - skb->len);
215
216 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
217 spare_blocks);
218
219 desc->id = id;
220
221 wl->tx_blocks_available -= total_blocks;
222 wl->tx_allocated_blocks += total_blocks;
223
224 /* If the FW was empty before, arm the Tx watchdog */
225 if (wl->tx_allocated_blocks == total_blocks)
226 wl12xx_rearm_tx_watchdog_locked(wl);
227
228 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
229 wl->tx_allocated_pkts[ac]++;
230
231 if (!is_dummy && wlvif &&
232 wlvif->bss_type == BSS_TYPE_AP_BSS &&
233 test_bit(hlid, wlvif->ap.sta_hlid_map))
234 wl->links[hlid].allocated_pkts++;
235
236 ret = 0;
237
238 wl1271_debug(DEBUG_TX,
239 "tx_allocate: size: %d, blocks: %d, id: %d",
240 total_len, total_blocks, id);
241 } else {
242 wl1271_free_tx_id(wl, id);
243 }
244
245 return ret;
246}
247
248static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
249 struct sk_buff *skb, u32 extra,
250 struct ieee80211_tx_info *control, u8 hlid)
251{
252 struct timespec ts;
253 struct wl1271_tx_hw_descr *desc;
254 int ac, rate_idx;
255 s64 hosttime;
256 u16 tx_attr = 0;
257 __le16 frame_control;
258 struct ieee80211_hdr *hdr;
259 u8 *frame_start;
260 bool is_dummy;
261
262 desc = (struct wl1271_tx_hw_descr *) skb->data;
263 frame_start = (u8 *)(desc + 1);
264 hdr = (struct ieee80211_hdr *)(frame_start + extra);
265 frame_control = hdr->frame_control;
266
267 /* relocate space for security header */
268 if (extra) {
269 int hdrlen = ieee80211_hdrlen(frame_control);
270 memmove(frame_start, hdr, hdrlen);
271 }
272
273 /* configure packet life time */
274 getnstimeofday(&ts);
275 hosttime = (timespec_to_ns(&ts) >> 10);
276 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
277
278 is_dummy = wl12xx_is_dummy_packet(wl, skb);
279 if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
280 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
281 else
282 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
283
284 /* queue */
285 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
286 desc->tid = skb->priority;
287
288 if (is_dummy) {
289 /*
290 * FW expects the dummy packet to have an invalid session id -
291 * any session id that is different than the one set in the join
292 */
293 tx_attr = (SESSION_COUNTER_INVALID <<
294 TX_HW_ATTR_OFST_SESSION_COUNTER) &
295 TX_HW_ATTR_SESSION_COUNTER;
296
297 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
298 } else if (wlvif) {
299 /* configure the tx attributes */
300 tx_attr = wlvif->session_counter <<
301 TX_HW_ATTR_OFST_SESSION_COUNTER;
302 }
303
304 desc->hlid = hlid;
305 if (is_dummy || !wlvif)
306 rate_idx = 0;
307 else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
308 /* if the packets are destined for AP (have a STA entry)
309 send them with AP rate policies, otherwise use default
310 basic rates */
311 if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
312 rate_idx = wlvif->sta.p2p_rate_idx;
313 else if (control->control.sta)
314 rate_idx = wlvif->sta.ap_rate_idx;
315 else
316 rate_idx = wlvif->sta.basic_rate_idx;
317 } else {
318 if (hlid == wlvif->ap.global_hlid)
319 rate_idx = wlvif->ap.mgmt_rate_idx;
320 else if (hlid == wlvif->ap.bcast_hlid)
321 rate_idx = wlvif->ap.bcast_rate_idx;
322 else
323 rate_idx = wlvif->ap.ucast_rate_idx[ac];
324 }
325
326 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
327
328 /* for WEP shared auth - no fw encryption is needed */
329 if (ieee80211_is_auth(frame_control) &&
330 ieee80211_has_protected(frame_control))
331 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
332
333 desc->reserved = 0;
334 desc->tx_attr = cpu_to_le16(tx_attr);
335
336 wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
337}
338
339/* caller must hold wl->mutex */
340static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
341 struct sk_buff *skb, u32 buf_offset)
342{
343 struct ieee80211_tx_info *info;
344 u32 extra = 0;
345 int ret = 0;
346 u32 total_len;
347 u8 hlid;
348 bool is_dummy;
349
350 if (!skb)
351 return -EINVAL;
352
353 info = IEEE80211_SKB_CB(skb);
354
355 /* TODO: handle dummy packets on multi-vifs */
356 is_dummy = wl12xx_is_dummy_packet(wl, skb);
357
358 if (info->control.hw_key &&
359 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
360 extra = WL1271_EXTRA_SPACE_TKIP;
361
362 if (info->control.hw_key) {
363 bool is_wep;
364 u8 idx = info->control.hw_key->hw_key_idx;
365 u32 cipher = info->control.hw_key->cipher;
366
367 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
368 (cipher == WLAN_CIPHER_SUITE_WEP104);
369
370 if (unlikely(is_wep && wlvif->default_key != idx)) {
371 ret = wl1271_set_default_wep_key(wl, wlvif, idx);
372 if (ret < 0)
373 return ret;
374 wlvif->default_key = idx;
375 }
376 }
377 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
378 if (hlid == WL12XX_INVALID_LINK_ID) {
379 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
380 return -EINVAL;
381 }
382
383 ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid);
384 if (ret < 0)
385 return ret;
386
387 wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
388
389 if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
390 wl1271_tx_ap_update_inconnection_sta(wl, skb);
391 wl1271_tx_regulate_link(wl, wlvif, hlid);
392 }
393
394 /*
395 * The length of each packet is stored in terms of
396 * words. Thus, we must pad the skb data to make sure its
397 * length is aligned. The number of padding bytes is computed
398 * and set in wl1271_tx_fill_hdr.
399 * In special cases, we want to align to a specific block size
400 * (eg. for wl128x with SDIO we align to 256).
401 */
402 total_len = wlcore_calc_packet_alignment(wl, skb->len);
403
404 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
405 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
406
407 /* Revert side effects in the dummy packet skb, so it can be reused */
408 if (is_dummy)
409 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
410
411 return total_len;
412}
413
414u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
415 enum ieee80211_band rate_band)
416{
417 struct ieee80211_supported_band *band;
418 u32 enabled_rates = 0;
419 int bit;
420
421 band = wl->hw->wiphy->bands[rate_band];
422 for (bit = 0; bit < band->n_bitrates; bit++) {
423 if (rate_set & 0x1)
424 enabled_rates |= band->bitrates[bit].hw_value;
425 rate_set >>= 1;
426 }
427
428 /* MCS rates indication are on bits 16 - 23 */
429 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
430
431 for (bit = 0; bit < 8; bit++) {
432 if (rate_set & 0x1)
433 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
434 rate_set >>= 1;
435 }
436
437 return enabled_rates;
438}
439
440void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
441{
442 unsigned long flags;
443 int i;
444
445 for (i = 0; i < NUM_TX_QUEUES; i++) {
446 if (test_bit(i, &wl->stopped_queues_map) &&
447 wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
448 /* firmware buffer has space, restart queues */
449 spin_lock_irqsave(&wl->wl_lock, flags);
450 ieee80211_wake_queue(wl->hw,
451 wl1271_tx_get_mac80211_queue(i));
452 clear_bit(i, &wl->stopped_queues_map);
453 spin_unlock_irqrestore(&wl->wl_lock, flags);
454 }
455 }
456}
457
458static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
459 struct sk_buff_head *queues)
460{
461 int i, q = -1, ac;
462 u32 min_pkts = 0xffffffff;
463
464 /*
465 * Find a non-empty ac where:
466 * 1. There are packets to transmit
467 * 2. The FW has the least allocated blocks
468 *
469 * We prioritize the ACs according to VO>VI>BE>BK
470 */
471 for (i = 0; i < NUM_TX_QUEUES; i++) {
472 ac = wl1271_tx_get_queue(i);
473 if (!skb_queue_empty(&queues[ac]) &&
474 (wl->tx_allocated_pkts[ac] < min_pkts)) {
475 q = ac;
476 min_pkts = wl->tx_allocated_pkts[q];
477 }
478 }
479
480 if (q == -1)
481 return NULL;
482
483 return &queues[q];
484}
485
486static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
487 struct wl1271_link *lnk)
488{
489 struct sk_buff *skb;
490 unsigned long flags;
491 struct sk_buff_head *queue;
492
493 queue = wl1271_select_queue(wl, lnk->tx_queue);
494 if (!queue)
495 return NULL;
496
497 skb = skb_dequeue(queue);
498 if (skb) {
499 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
500 spin_lock_irqsave(&wl->wl_lock, flags);
501 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
502 wl->tx_queue_count[q]--;
503 spin_unlock_irqrestore(&wl->wl_lock, flags);
504 }
505
506 return skb;
507}
508
509static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
510 struct wl12xx_vif *wlvif)
511{
512 struct sk_buff *skb = NULL;
513 int i, h, start_hlid;
514
515 /* start from the link after the last one */
516 start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
517
518 /* dequeue according to AC, round robin on each link */
519 for (i = 0; i < WL12XX_MAX_LINKS; i++) {
520 h = (start_hlid + i) % WL12XX_MAX_LINKS;
521
522 /* only consider connected stations */
523 if (!test_bit(h, wlvif->links_map))
524 continue;
525
526 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
527 if (!skb)
528 continue;
529
530 wlvif->last_tx_hlid = h;
531 break;
532 }
533
534 if (!skb)
535 wlvif->last_tx_hlid = 0;
536
537 return skb;
538}
539
540static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
541{
542 unsigned long flags;
543 struct wl12xx_vif *wlvif = wl->last_wlvif;
544 struct sk_buff *skb = NULL;
545
546 /* continue from last wlvif (round robin) */
547 if (wlvif) {
548 wl12xx_for_each_wlvif_continue(wl, wlvif) {
549 skb = wl12xx_vif_skb_dequeue(wl, wlvif);
550 if (skb) {
551 wl->last_wlvif = wlvif;
552 break;
553 }
554 }
555 }
556
557 /* dequeue from the system HLID before the restarting wlvif list */
558 if (!skb)
559 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
560
561 /* do a new pass over the wlvif list */
562 if (!skb) {
563 wl12xx_for_each_wlvif(wl, wlvif) {
564 skb = wl12xx_vif_skb_dequeue(wl, wlvif);
565 if (skb) {
566 wl->last_wlvif = wlvif;
567 break;
568 }
569
570 /*
571 * No need to continue after last_wlvif. The previous
572 * pass should have found it.
573 */
574 if (wlvif == wl->last_wlvif)
575 break;
576 }
577 }
578
579 if (!skb &&
580 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
581 int q;
582
583 skb = wl->dummy_packet;
584 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
585 spin_lock_irqsave(&wl->wl_lock, flags);
586 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
587 wl->tx_queue_count[q]--;
588 spin_unlock_irqrestore(&wl->wl_lock, flags);
589 }
590
591 return skb;
592}
593
594static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
595 struct sk_buff *skb)
596{
597 unsigned long flags;
598 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
599
600 if (wl12xx_is_dummy_packet(wl, skb)) {
601 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
602 } else {
603 u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
604 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
605
606 /* make sure we dequeue the same packet next time */
607 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
608 WL12XX_MAX_LINKS;
609 }
610
611 spin_lock_irqsave(&wl->wl_lock, flags);
612 wl->tx_queue_count[q]++;
613 spin_unlock_irqrestore(&wl->wl_lock, flags);
614}
615
616static bool wl1271_tx_is_data_present(struct sk_buff *skb)
617{
618 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
619
620 return ieee80211_is_data_present(hdr->frame_control);
621}
622
623void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
624{
625 struct wl12xx_vif *wlvif;
626 u32 timeout;
627 u8 hlid;
628
629 if (!wl->conf.rx_streaming.interval)
630 return;
631
632 if (!wl->conf.rx_streaming.always &&
633 !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
634 return;
635
636 timeout = wl->conf.rx_streaming.duration;
637 wl12xx_for_each_wlvif_sta(wl, wlvif) {
638 bool found = false;
639 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
640 if (test_bit(hlid, wlvif->links_map)) {
641 found = true;
642 break;
643 }
644 }
645
646 if (!found)
647 continue;
648
649 /* enable rx streaming */
650 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
651 ieee80211_queue_work(wl->hw,
652 &wlvif->rx_streaming_enable_work);
653
654 mod_timer(&wlvif->rx_streaming_timer,
655 jiffies + msecs_to_jiffies(timeout));
656 }
657}
658
659void wl1271_tx_work_locked(struct wl1271 *wl)
660{
661 struct wl12xx_vif *wlvif;
662 struct sk_buff *skb;
663 struct wl1271_tx_hw_descr *desc;
664 u32 buf_offset = 0;
665 bool sent_packets = false;
666 unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
667 int ret;
668
669 if (unlikely(wl->state == WL1271_STATE_OFF))
670 return;
671
672 while ((skb = wl1271_skb_dequeue(wl))) {
673 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
674 bool has_data = false;
675
676 wlvif = NULL;
677 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
678 wlvif = wl12xx_vif_to_data(info->control.vif);
679
680 has_data = wlvif && wl1271_tx_is_data_present(skb);
681 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset);
682 if (ret == -EAGAIN) {
683 /*
684 * Aggregation buffer is full.
685 * Flush buffer and try again.
686 */
687 wl1271_skb_queue_head(wl, wlvif, skb);
688 wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
689 buf_offset, true);
690 sent_packets = true;
691 buf_offset = 0;
692 continue;
693 } else if (ret == -EBUSY) {
694 /*
695 * Firmware buffer is full.
696 * Queue back last skb, and stop aggregating.
697 */
698 wl1271_skb_queue_head(wl, wlvif, skb);
699 /* No work left, avoid scheduling redundant tx work */
700 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
701 goto out_ack;
702 } else if (ret < 0) {
703 if (wl12xx_is_dummy_packet(wl, skb))
704 /*
705 * fw still expects dummy packet,
706 * so re-enqueue it
707 */
708 wl1271_skb_queue_head(wl, wlvif, skb);
709 else
710 ieee80211_free_txskb(wl->hw, skb);
711 goto out_ack;
712 }
713 buf_offset += ret;
714 wl->tx_packets_count++;
715 if (has_data) {
716 desc = (struct wl1271_tx_hw_descr *) skb->data;
717 __set_bit(desc->hlid, active_hlids);
718 }
719 }
720
721out_ack:
722 if (buf_offset) {
723 wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
724 buf_offset, true);
725 sent_packets = true;
726 }
727 if (sent_packets) {
728 /*
729 * Interrupt the firmware with the new packets. This is only
730 * required for older hardware revisions
731 */
732 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION)
733 wl1271_write32(wl, WL12XX_HOST_WR_ACCESS,
734 wl->tx_packets_count);
735
736 wl1271_handle_tx_low_watermark(wl);
737 }
738 wl12xx_rearm_rx_streaming(wl, active_hlids);
739}
740
741void wl1271_tx_work(struct work_struct *work)
742{
743 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
744 int ret;
745
746 mutex_lock(&wl->mutex);
747 ret = wl1271_ps_elp_wakeup(wl);
748 if (ret < 0)
749 goto out;
750
751 wl1271_tx_work_locked(wl);
752
753 wl1271_ps_elp_sleep(wl);
754out:
755 mutex_unlock(&wl->mutex);
756}
757
758static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
759{
760 u8 flags = 0;
761
762 /*
763 * TODO: use wl12xx constants when this code is moved to wl12xx, as
764 * only it uses Tx-completion.
765 */
766 if (rate_class_index <= 8)
767 flags |= IEEE80211_TX_RC_MCS;
768
769 /*
770 * TODO: use wl12xx constants when this code is moved to wl12xx, as
771 * only it uses Tx-completion.
772 */
773 if (rate_class_index == 0)
774 flags |= IEEE80211_TX_RC_SHORT_GI;
775
776 return flags;
777}
778
779static void wl1271_tx_complete_packet(struct wl1271 *wl,
780 struct wl1271_tx_hw_res_descr *result)
781{
782 struct ieee80211_tx_info *info;
783 struct ieee80211_vif *vif;
784 struct wl12xx_vif *wlvif;
785 struct sk_buff *skb;
786 int id = result->id;
787 int rate = -1;
788 u8 rate_flags = 0;
789 u8 retries = 0;
790
791 /* check for id legality */
792 if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
793 wl1271_warning("TX result illegal id: %d", id);
794 return;
795 }
796
797 skb = wl->tx_frames[id];
798 info = IEEE80211_SKB_CB(skb);
799
800 if (wl12xx_is_dummy_packet(wl, skb)) {
801 wl1271_free_tx_id(wl, id);
802 return;
803 }
804
805 /* info->control is valid as long as we don't update info->status */
806 vif = info->control.vif;
807 wlvif = wl12xx_vif_to_data(vif);
808
809 /* update the TX status info */
810 if (result->status == TX_SUCCESS) {
811 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
812 info->flags |= IEEE80211_TX_STAT_ACK;
813 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
814 wlvif->band);
815 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
816 retries = result->ack_failures;
817 } else if (result->status == TX_RETRY_EXCEEDED) {
818 wl->stats.excessive_retries++;
819 retries = result->ack_failures;
820 }
821
822 info->status.rates[0].idx = rate;
823 info->status.rates[0].count = retries;
824 info->status.rates[0].flags = rate_flags;
825 info->status.ack_signal = -1;
826
827 wl->stats.retry_count += result->ack_failures;
828
829 /*
830 * update sequence number only when relevant, i.e. only in
831 * sessions of TKIP, AES and GEM (not in open or WEP sessions)
832 */
833 if (info->control.hw_key &&
834 (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
835 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
836 info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
837 u8 fw_lsb = result->tx_security_sequence_number_lsb;
838 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
839
840 /*
841 * update security sequence number, taking care of potential
842 * wrap-around
843 */
844 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
845 wlvif->tx_security_last_seq_lsb = fw_lsb;
846 }
847
848 /* remove private header from packet */
849 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
850
851 /* remove TKIP header space if present */
852 if (info->control.hw_key &&
853 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
854 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
855 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
856 hdrlen);
857 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
858 }
859
860 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
861 " status 0x%x",
862 result->id, skb, result->ack_failures,
863 result->rate_class_index, result->status);
864
865 /* return the packet to the stack */
866 skb_queue_tail(&wl->deferred_tx_queue, skb);
867 queue_work(wl->freezable_wq, &wl->netstack_work);
868 wl1271_free_tx_id(wl, result->id);
869}
870
871/* Called upon reception of a TX complete interrupt */
872void wl1271_tx_complete(struct wl1271 *wl)
873{
874 struct wl1271_acx_mem_map *memmap =
875 (struct wl1271_acx_mem_map *)wl->target_mem_map;
876 u32 count, fw_counter;
877 u32 i;
878
879 /* read the tx results from the chipset */
880 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
881 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
882 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
883
884 /* write host counter to chipset (to ack) */
885 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
886 offsetof(struct wl1271_tx_hw_res_if,
887 tx_result_host_counter), fw_counter);
888
889 count = fw_counter - wl->tx_results_count;
890 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
891
892 /* verify that the result buffer is not getting overrun */
893 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
894 wl1271_warning("TX result overflow from chipset: %d", count);
895
896 /* process the results */
897 for (i = 0; i < count; i++) {
898 struct wl1271_tx_hw_res_descr *result;
899 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
900
901 /* process the packet */
902 result = &(wl->tx_res_if->tx_results_queue[offset]);
903 wl1271_tx_complete_packet(wl, result);
904
905 wl->tx_results_count++;
906 }
907}
908EXPORT_SYMBOL(wl1271_tx_complete);
909
910void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
911{
912 struct sk_buff *skb;
913 int i;
914 unsigned long flags;
915 struct ieee80211_tx_info *info;
916 int total[NUM_TX_QUEUES];
917
918 for (i = 0; i < NUM_TX_QUEUES; i++) {
919 total[i] = 0;
920 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
921 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
922
923 if (!wl12xx_is_dummy_packet(wl, skb)) {
924 info = IEEE80211_SKB_CB(skb);
925 info->status.rates[0].idx = -1;
926 info->status.rates[0].count = 0;
927 ieee80211_tx_status_ni(wl->hw, skb);
928 }
929
930 total[i]++;
931 }
932 }
933
934 spin_lock_irqsave(&wl->wl_lock, flags);
935 for (i = 0; i < NUM_TX_QUEUES; i++)
936 wl->tx_queue_count[i] -= total[i];
937 spin_unlock_irqrestore(&wl->wl_lock, flags);
938
939 wl1271_handle_tx_low_watermark(wl);
940}
941
942/* caller must hold wl->mutex and TX must be stopped */
943void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
944{
945 int i;
946
947 /* TX failure */
948 for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
949 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
950 wl1271_free_sta(wl, wlvif, i);
951 else
952 wlvif->sta.ba_rx_bitmap = 0;
953
954 wl->links[i].allocated_pkts = 0;
955 wl->links[i].prev_freed_pkts = 0;
956 }
957 wlvif->last_tx_hlid = 0;
958
959}
960/* caller must hold wl->mutex and TX must be stopped */
961void wl12xx_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
962{
963 int i;
964 struct sk_buff *skb;
965 struct ieee80211_tx_info *info;
966
967 /* only reset the queues if something bad happened */
968 if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) {
969 for (i = 0; i < WL12XX_MAX_LINKS; i++)
970 wl1271_tx_reset_link_queues(wl, i);
971
972 for (i = 0; i < NUM_TX_QUEUES; i++)
973 wl->tx_queue_count[i] = 0;
974 }
975
976 wl->stopped_queues_map = 0;
977
978 /*
979 * Make sure the driver is at a consistent state, in case this
980 * function is called from a context other than interface removal.
981 * This call will always wake the TX queues.
982 */
983 if (reset_tx_queues)
984 wl1271_handle_tx_low_watermark(wl);
985
986 for (i = 0; i < wl->num_tx_desc; i++) {
987 if (wl->tx_frames[i] == NULL)
988 continue;
989
990 skb = wl->tx_frames[i];
991 wl1271_free_tx_id(wl, i);
992 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
993
994 if (!wl12xx_is_dummy_packet(wl, skb)) {
995 /*
996 * Remove private headers before passing the skb to
997 * mac80211
998 */
999 info = IEEE80211_SKB_CB(skb);
1000 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1001 if (info->control.hw_key &&
1002 info->control.hw_key->cipher ==
1003 WLAN_CIPHER_SUITE_TKIP) {
1004 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1005 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1006 skb->data, hdrlen);
1007 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1008 }
1009
1010 info->status.rates[0].idx = -1;
1011 info->status.rates[0].count = 0;
1012
1013 ieee80211_tx_status_ni(wl->hw, skb);
1014 }
1015 }
1016}
1017
1018#define WL1271_TX_FLUSH_TIMEOUT 500000
1019
1020/* caller must *NOT* hold wl->mutex */
1021void wl1271_tx_flush(struct wl1271 *wl)
1022{
1023 unsigned long timeout;
1024 int i;
1025 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1026
1027 while (!time_after(jiffies, timeout)) {
1028 mutex_lock(&wl->mutex);
1029 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
1030 wl->tx_frames_cnt,
1031 wl1271_tx_total_queue_count(wl));
1032 if ((wl->tx_frames_cnt == 0) &&
1033 (wl1271_tx_total_queue_count(wl) == 0)) {
1034 mutex_unlock(&wl->mutex);
1035 return;
1036 }
1037 mutex_unlock(&wl->mutex);
1038 msleep(1);
1039 }
1040
1041 wl1271_warning("Unable to flush all TX buffers, timed out.");
1042
1043 /* forcibly flush all Tx buffers on our queues */
1044 mutex_lock(&wl->mutex);
1045 for (i = 0; i < WL12XX_MAX_LINKS; i++)
1046 wl1271_tx_reset_link_queues(wl, i);
1047 mutex_unlock(&wl->mutex);
1048}
1049
1050u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1051{
1052 if (WARN_ON(!rate_set))
1053 return 0;
1054
1055 return BIT(__ffs(rate_set));
1056}