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wlcore/wl12xx: make sure session id is always zero for AP
[linux-2.6/btrfs-unstable.git] / drivers / net / wireless / ti / wlcore / tx.c
blobc3607f09284b3e977e24c6950420b606dbd82fc6
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
42 static 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
61 static 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
75 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 EXPORT_SYMBOL(wl1271_free_tx_id);
86
87 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
88 struct sk_buff *skb)
89 {
90 struct ieee80211_hdr *hdr;
91
92 /*
93 * add the station to the known list before transmitting the
94 * authentication response. this way it won't get de-authed by FW
95 * when transmitting too soon.
96 */
97 hdr = (struct ieee80211_hdr *)(skb->data +
98 sizeof(struct wl1271_tx_hw_descr));
99 if (ieee80211_is_auth(hdr->frame_control))
100 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
101 }
102
103 static void wl1271_tx_regulate_link(struct wl1271 *wl,
104 struct wl12xx_vif *wlvif,
105 u8 hlid)
106 {
107 bool fw_ps, single_sta;
108 u8 tx_pkts;
109
110 if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
111 return;
112
113 fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
114 tx_pkts = wl->links[hlid].allocated_pkts;
115 single_sta = (wl->active_sta_count == 1);
116
117 /*
118 * if in FW PS and there is enough data in FW we can put the link
119 * into high-level PS and clean out its TX queues.
120 * Make an exception if this is the only connected station. In this
121 * case FW-memory congestion is not a problem.
122 */
123 if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
124 wl12xx_ps_link_start(wl, wlvif, hlid, true);
125 }
126
127 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
128 {
129 return wl->dummy_packet == skb;
130 }
131 EXPORT_SYMBOL(wl12xx_is_dummy_packet);
132
133 static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
134 struct sk_buff *skb, struct ieee80211_sta *sta)
135 {
136 if (sta) {
137 struct wl1271_station *wl_sta;
138
139 wl_sta = (struct wl1271_station *)sta->drv_priv;
140 return wl_sta->hlid;
141 } else {
142 struct ieee80211_hdr *hdr;
143
144 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
145 return wl->system_hlid;
146
147 hdr = (struct ieee80211_hdr *)skb->data;
148 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
149 return wlvif->ap.bcast_hlid;
150 else
151 return wlvif->ap.global_hlid;
152 }
153 }
154
155 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
156 struct sk_buff *skb, struct ieee80211_sta *sta)
157 {
158 struct ieee80211_tx_info *control;
159
160 if (!wlvif || wl12xx_is_dummy_packet(wl, skb))
161 return wl->system_hlid;
162
163 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
164 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta);
165
166 control = IEEE80211_SKB_CB(skb);
167 if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
168 wl1271_debug(DEBUG_TX, "tx offchannel");
169 return wlvif->dev_hlid;
170 }
171
172 return wlvif->sta.hlid;
173 }
174
175 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
176 unsigned int packet_length)
177 {
178 if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
179 !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
180 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
181 else
182 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
183 }
184 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
185
186 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
187 struct sk_buff *skb, u32 extra, u32 buf_offset,
188 u8 hlid, bool is_gem)
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;
195
196 if (buf_offset + total_len > wl->aggr_buf_size)
197 return -EAGAIN;
198
199 spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
200
201 /* allocate free identifier for the packet */
202 id = wl1271_alloc_tx_id(wl, skb);
203 if (id < 0)
204 return id;
205
206 total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
207
208 if (total_blocks <= wl->tx_blocks_available) {
209 desc = (struct wl1271_tx_hw_descr *)skb_push(
210 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 /* If the FW was empty before, arm the Tx watchdog */
221 if (wl->tx_allocated_blocks == total_blocks)
222 wl12xx_rearm_tx_watchdog_locked(wl);
223
224 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
225 wl->tx_allocated_pkts[ac]++;
226
227 if (!wl12xx_is_dummy_packet(wl, skb) && wlvif &&
228 wlvif->bss_type == BSS_TYPE_AP_BSS &&
229 test_bit(hlid, wlvif->ap.sta_hlid_map))
230 wl->links[hlid].allocated_pkts++;
231
232 ret = 0;
233
234 wl1271_debug(DEBUG_TX,
235 "tx_allocate: size: %d, blocks: %d, id: %d",
236 total_len, total_blocks, id);
237 } else {
238 wl1271_free_tx_id(wl, id);
239 }
240
241 return ret;
242 }
243
244 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
245 struct sk_buff *skb, u32 extra,
246 struct ieee80211_tx_info *control, u8 hlid)
247 {
248 struct timespec ts;
249 struct wl1271_tx_hw_descr *desc;
250 int ac, rate_idx;
251 s64 hosttime;
252 u16 tx_attr = 0;
253 __le16 frame_control;
254 struct ieee80211_hdr *hdr;
255 u8 *frame_start;
256 bool is_dummy;
257
258 desc = (struct wl1271_tx_hw_descr *) skb->data;
259 frame_start = (u8 *)(desc + 1);
260 hdr = (struct ieee80211_hdr *)(frame_start + extra);
261 frame_control = hdr->frame_control;
262
263 /* relocate space for security header */
264 if (extra) {
265 int hdrlen = ieee80211_hdrlen(frame_control);
266 memmove(frame_start, hdr, hdrlen);
267 skb_set_network_header(skb, skb_network_offset(skb) + extra);
268 }
269
270 /* configure packet life time */
271 getnstimeofday(&ts);
272 hosttime = (timespec_to_ns(&ts) >> 10);
273 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
274
275 is_dummy = wl12xx_is_dummy_packet(wl, skb);
276 if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
277 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
278 else
279 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
280
281 /* queue */
282 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
283 desc->tid = skb->priority;
284
285 if (is_dummy) {
286 /*
287 * FW expects the dummy packet to have an invalid session id -
288 * any session id that is different than the one set in the join
289 */
290 tx_attr = (SESSION_COUNTER_INVALID <<
291 TX_HW_ATTR_OFST_SESSION_COUNTER) &
292 TX_HW_ATTR_SESSION_COUNTER;
293
294 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
295 } else if (wlvif) {
296 u8 session_id = wl->session_ids[hlid];
297
298 if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
299 (wlvif->bss_type == BSS_TYPE_AP_BSS))
300 session_id = 0;
301
302 /* configure the tx attributes */
303 tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
304 }
305
306 desc->hlid = hlid;
307 if (is_dummy || !wlvif)
308 rate_idx = 0;
309 else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
310 /*
311 * if the packets are data packets
312 * send them with AP rate policies (EAPOLs are an exception),
313 * otherwise use default basic rates
314 */
315 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
316 rate_idx = wlvif->sta.basic_rate_idx;
317 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
318 rate_idx = wlvif->sta.p2p_rate_idx;
319 else if (ieee80211_is_data(frame_control))
320 rate_idx = wlvif->sta.ap_rate_idx;
321 else
322 rate_idx = wlvif->sta.basic_rate_idx;
323 } else {
324 if (hlid == wlvif->ap.global_hlid)
325 rate_idx = wlvif->ap.mgmt_rate_idx;
326 else if (hlid == wlvif->ap.bcast_hlid ||
327 skb->protocol == cpu_to_be16(ETH_P_PAE) ||
328 !ieee80211_is_data(frame_control))
329 /*
330 * send non-data, bcast and EAPOLs using the
331 * min basic rate
332 */
333 rate_idx = wlvif->ap.bcast_rate_idx;
334 else
335 rate_idx = wlvif->ap.ucast_rate_idx[ac];
336 }
337
338 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
339
340 /* for WEP shared auth - no fw encryption is needed */
341 if (ieee80211_is_auth(frame_control) &&
342 ieee80211_has_protected(frame_control))
343 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
344
345 desc->tx_attr = cpu_to_le16(tx_attr);
346
347 wlcore_hw_set_tx_desc_csum(wl, desc, skb);
348 wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
349 }
350
351 /* caller must hold wl->mutex */
352 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
353 struct sk_buff *skb, u32 buf_offset, u8 hlid)
354 {
355 struct ieee80211_tx_info *info;
356 u32 extra = 0;
357 int ret = 0;
358 u32 total_len;
359 bool is_dummy;
360 bool is_gem = false;
361
362 if (!skb) {
363 wl1271_error("discarding null skb");
364 return -EINVAL;
365 }
366
367 if (hlid == WL12XX_INVALID_LINK_ID) {
368 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
369 return -EINVAL;
370 }
371
372 info = IEEE80211_SKB_CB(skb);
373
374 is_dummy = wl12xx_is_dummy_packet(wl, skb);
375
376 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
377 info->control.hw_key &&
378 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
379 extra = WL1271_EXTRA_SPACE_TKIP;
380
381 if (info->control.hw_key) {
382 bool is_wep;
383 u8 idx = info->control.hw_key->hw_key_idx;
384 u32 cipher = info->control.hw_key->cipher;
385
386 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
387 (cipher == WLAN_CIPHER_SUITE_WEP104);
388
389 if (unlikely(is_wep && wlvif->default_key != idx)) {
390 ret = wl1271_set_default_wep_key(wl, wlvif, idx);
391 if (ret < 0)
392 return ret;
393 wlvif->default_key = idx;
394 }
395
396 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
397 }
398
399 ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
400 is_gem);
401 if (ret < 0)
402 return ret;
403
404 wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
405
406 if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
407 wl1271_tx_ap_update_inconnection_sta(wl, skb);
408 wl1271_tx_regulate_link(wl, wlvif, hlid);
409 }
410
411 /*
412 * The length of each packet is stored in terms of
413 * words. Thus, we must pad the skb data to make sure its
414 * length is aligned. The number of padding bytes is computed
415 * and set in wl1271_tx_fill_hdr.
416 * In special cases, we want to align to a specific block size
417 * (eg. for wl128x with SDIO we align to 256).
418 */
419 total_len = wlcore_calc_packet_alignment(wl, skb->len);
420
421 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
422 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
423
424 /* Revert side effects in the dummy packet skb, so it can be reused */
425 if (is_dummy)
426 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
427
428 return total_len;
429 }
430
431 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
432 enum ieee80211_band rate_band)
433 {
434 struct ieee80211_supported_band *band;
435 u32 enabled_rates = 0;
436 int bit;
437
438 band = wl->hw->wiphy->bands[rate_band];
439 for (bit = 0; bit < band->n_bitrates; bit++) {
440 if (rate_set & 0x1)
441 enabled_rates |= band->bitrates[bit].hw_value;
442 rate_set >>= 1;
443 }
444
445 /* MCS rates indication are on bits 16 - 31 */
446 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
447
448 for (bit = 0; bit < 16; bit++) {
449 if (rate_set & 0x1)
450 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
451 rate_set >>= 1;
452 }
453
454 return enabled_rates;
455 }
456
457 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
458 {
459 int i;
460
461 for (i = 0; i < NUM_TX_QUEUES; i++) {
462 if (wlcore_is_queue_stopped_by_reason(wl, i,
463 WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
464 wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
465 /* firmware buffer has space, restart queues */
466 wlcore_wake_queue(wl, i,
467 WLCORE_QUEUE_STOP_REASON_WATERMARK);
468 }
469 }
470 }
471
472 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
473 struct sk_buff_head *queues)
474 {
475 int i, q = -1, ac;
476 u32 min_pkts = 0xffffffff;
477
478 /*
479 * Find a non-empty ac where:
480 * 1. There are packets to transmit
481 * 2. The FW has the least allocated blocks
482 *
483 * We prioritize the ACs according to VO>VI>BE>BK
484 */
485 for (i = 0; i < NUM_TX_QUEUES; i++) {
486 ac = wl1271_tx_get_queue(i);
487 if (!skb_queue_empty(&queues[ac]) &&
488 (wl->tx_allocated_pkts[ac] < min_pkts)) {
489 q = ac;
490 min_pkts = wl->tx_allocated_pkts[q];
491 }
492 }
493
494 if (q == -1)
495 return NULL;
496
497 return &queues[q];
498 }
499
500 static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
501 struct wl1271_link *lnk)
502 {
503 struct sk_buff *skb;
504 unsigned long flags;
505 struct sk_buff_head *queue;
506
507 queue = wl1271_select_queue(wl, lnk->tx_queue);
508 if (!queue)
509 return NULL;
510
511 skb = skb_dequeue(queue);
512 if (skb) {
513 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
514 spin_lock_irqsave(&wl->wl_lock, flags);
515 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
516 wl->tx_queue_count[q]--;
517 spin_unlock_irqrestore(&wl->wl_lock, flags);
518 }
519
520 return skb;
521 }
522
523 static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
524 struct wl12xx_vif *wlvif,
525 u8 *hlid)
526 {
527 struct sk_buff *skb = NULL;
528 int i, h, start_hlid;
529
530 /* start from the link after the last one */
531 start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
532
533 /* dequeue according to AC, round robin on each link */
534 for (i = 0; i < WL12XX_MAX_LINKS; i++) {
535 h = (start_hlid + i) % WL12XX_MAX_LINKS;
536
537 /* only consider connected stations */
538 if (!test_bit(h, wlvif->links_map))
539 continue;
540
541 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
542 if (!skb)
543 continue;
544
545 wlvif->last_tx_hlid = h;
546 break;
547 }
548
549 if (!skb)
550 wlvif->last_tx_hlid = 0;
551
552 *hlid = wlvif->last_tx_hlid;
553 return skb;
554 }
555
556 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
557 {
558 unsigned long flags;
559 struct wl12xx_vif *wlvif = wl->last_wlvif;
560 struct sk_buff *skb = NULL;
561
562 /* continue from last wlvif (round robin) */
563 if (wlvif) {
564 wl12xx_for_each_wlvif_continue(wl, wlvif) {
565 skb = wl12xx_vif_skb_dequeue(wl, wlvif, hlid);
566 if (skb) {
567 wl->last_wlvif = wlvif;
568 break;
569 }
570 }
571 }
572
573 /* dequeue from the system HLID before the restarting wlvif list */
574 if (!skb) {
575 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
576 *hlid = wl->system_hlid;
577 }
578
579 /* do a new pass over the wlvif list */
580 if (!skb) {
581 wl12xx_for_each_wlvif(wl, wlvif) {
582 skb = wl12xx_vif_skb_dequeue(wl, wlvif, hlid);
583 if (skb) {
584 wl->last_wlvif = wlvif;
585 break;
586 }
587
588 /*
589 * No need to continue after last_wlvif. The previous
590 * pass should have found it.
591 */
592 if (wlvif == wl->last_wlvif)
593 break;
594 }
595 }
596
597 if (!skb &&
598 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
599 int q;
600
601 skb = wl->dummy_packet;
602 *hlid = wl->system_hlid;
603 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
604 spin_lock_irqsave(&wl->wl_lock, flags);
605 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
606 wl->tx_queue_count[q]--;
607 spin_unlock_irqrestore(&wl->wl_lock, flags);
608 }
609
610 return skb;
611 }
612
613 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
614 struct sk_buff *skb, u8 hlid)
615 {
616 unsigned long flags;
617 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
618
619 if (wl12xx_is_dummy_packet(wl, skb)) {
620 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
621 } else {
622 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
623
624 /* make sure we dequeue the same packet next time */
625 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
626 WL12XX_MAX_LINKS;
627 }
628
629 spin_lock_irqsave(&wl->wl_lock, flags);
630 wl->tx_queue_count[q]++;
631 spin_unlock_irqrestore(&wl->wl_lock, flags);
632 }
633
634 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
635 {
636 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
637
638 return ieee80211_is_data_present(hdr->frame_control);
639 }
640
641 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
642 {
643 struct wl12xx_vif *wlvif;
644 u32 timeout;
645 u8 hlid;
646
647 if (!wl->conf.rx_streaming.interval)
648 return;
649
650 if (!wl->conf.rx_streaming.always &&
651 !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
652 return;
653
654 timeout = wl->conf.rx_streaming.duration;
655 wl12xx_for_each_wlvif_sta(wl, wlvif) {
656 bool found = false;
657 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
658 if (test_bit(hlid, wlvif->links_map)) {
659 found = true;
660 break;
661 }
662 }
663
664 if (!found)
665 continue;
666
667 /* enable rx streaming */
668 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
669 ieee80211_queue_work(wl->hw,
670 &wlvif->rx_streaming_enable_work);
671
672 mod_timer(&wlvif->rx_streaming_timer,
673 jiffies + msecs_to_jiffies(timeout));
674 }
675 }
676
677 /*
678 * Returns failure values only in case of failed bus ops within this function.
679 * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
680 * triggering recovery by higher layers when not necessary.
681 * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
682 * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
683 * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
684 * within prepare_tx_frame code but there's nothing we should do about those
685 * as well.
686 */
687 int wlcore_tx_work_locked(struct wl1271 *wl)
688 {
689 struct wl12xx_vif *wlvif;
690 struct sk_buff *skb;
691 struct wl1271_tx_hw_descr *desc;
692 u32 buf_offset = 0, last_len = 0;
693 bool sent_packets = false;
694 unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
695 int ret = 0;
696 int bus_ret = 0;
697 u8 hlid;
698
699 if (unlikely(wl->state != WLCORE_STATE_ON))
700 return 0;
701
702 while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
703 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
704 bool has_data = false;
705
706 wlvif = NULL;
707 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
708 wlvif = wl12xx_vif_to_data(info->control.vif);
709 else
710 hlid = wl->system_hlid;
711
712 has_data = wlvif && wl1271_tx_is_data_present(skb);
713 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
714 hlid);
715 if (ret == -EAGAIN) {
716 /*
717 * Aggregation buffer is full.
718 * Flush buffer and try again.
719 */
720 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
721
722 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
723 last_len);
724 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
725 wl->aggr_buf, buf_offset, true);
726 if (bus_ret < 0)
727 goto out;
728
729 sent_packets = true;
730 buf_offset = 0;
731 continue;
732 } else if (ret == -EBUSY) {
733 /*
734 * Firmware buffer is full.
735 * Queue back last skb, and stop aggregating.
736 */
737 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
738 /* No work left, avoid scheduling redundant tx work */
739 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
740 goto out_ack;
741 } else if (ret < 0) {
742 if (wl12xx_is_dummy_packet(wl, skb))
743 /*
744 * fw still expects dummy packet,
745 * so re-enqueue it
746 */
747 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
748 else
749 ieee80211_free_txskb(wl->hw, skb);
750 goto out_ack;
751 }
752 last_len = ret;
753 buf_offset += last_len;
754 wl->tx_packets_count++;
755 if (has_data) {
756 desc = (struct wl1271_tx_hw_descr *) skb->data;
757 __set_bit(desc->hlid, active_hlids);
758 }
759 }
760
761 out_ack:
762 if (buf_offset) {
763 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
764 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
765 buf_offset, true);
766 if (bus_ret < 0)
767 goto out;
768
769 sent_packets = true;
770 }
771 if (sent_packets) {
772 /*
773 * Interrupt the firmware with the new packets. This is only
774 * required for older hardware revisions
775 */
776 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
777 bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
778 wl->tx_packets_count);
779 if (bus_ret < 0)
780 goto out;
781 }
782
783 wl1271_handle_tx_low_watermark(wl);
784 }
785 wl12xx_rearm_rx_streaming(wl, active_hlids);
786
787 out:
788 return bus_ret;
789 }
790
791 void wl1271_tx_work(struct work_struct *work)
792 {
793 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
794 int ret;
795
796 mutex_lock(&wl->mutex);
797 ret = wl1271_ps_elp_wakeup(wl);
798 if (ret < 0)
799 goto out;
800
801 ret = wlcore_tx_work_locked(wl);
802 if (ret < 0) {
803 wl12xx_queue_recovery_work(wl);
804 goto out;
805 }
806
807 wl1271_ps_elp_sleep(wl);
808 out:
809 mutex_unlock(&wl->mutex);
810 }
811
812 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
813 {
814 u8 flags = 0;
815
816 /*
817 * TODO: use wl12xx constants when this code is moved to wl12xx, as
818 * only it uses Tx-completion.
819 */
820 if (rate_class_index <= 8)
821 flags |= IEEE80211_TX_RC_MCS;
822
823 /*
824 * TODO: use wl12xx constants when this code is moved to wl12xx, as
825 * only it uses Tx-completion.
826 */
827 if (rate_class_index == 0)
828 flags |= IEEE80211_TX_RC_SHORT_GI;
829
830 return flags;
831 }
832
833 static void wl1271_tx_complete_packet(struct wl1271 *wl,
834 struct wl1271_tx_hw_res_descr *result)
835 {
836 struct ieee80211_tx_info *info;
837 struct ieee80211_vif *vif;
838 struct wl12xx_vif *wlvif;
839 struct sk_buff *skb;
840 int id = result->id;
841 int rate = -1;
842 u8 rate_flags = 0;
843 u8 retries = 0;
844
845 /* check for id legality */
846 if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
847 wl1271_warning("TX result illegal id: %d", id);
848 return;
849 }
850
851 skb = wl->tx_frames[id];
852 info = IEEE80211_SKB_CB(skb);
853
854 if (wl12xx_is_dummy_packet(wl, skb)) {
855 wl1271_free_tx_id(wl, id);
856 return;
857 }
858
859 /* info->control is valid as long as we don't update info->status */
860 vif = info->control.vif;
861 wlvif = wl12xx_vif_to_data(vif);
862
863 /* update the TX status info */
864 if (result->status == TX_SUCCESS) {
865 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
866 info->flags |= IEEE80211_TX_STAT_ACK;
867 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
868 wlvif->band);
869 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
870 retries = result->ack_failures;
871 } else if (result->status == TX_RETRY_EXCEEDED) {
872 wl->stats.excessive_retries++;
873 retries = result->ack_failures;
874 }
875
876 info->status.rates[0].idx = rate;
877 info->status.rates[0].count = retries;
878 info->status.rates[0].flags = rate_flags;
879 info->status.ack_signal = -1;
880
881 wl->stats.retry_count += result->ack_failures;
882
883 /*
884 * update sequence number only when relevant, i.e. only in
885 * sessions of TKIP, AES and GEM (not in open or WEP sessions)
886 */
887 if (info->control.hw_key &&
888 (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
889 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
890 info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
891 u8 fw_lsb = result->tx_security_sequence_number_lsb;
892 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
893
894 /*
895 * update security sequence number, taking care of potential
896 * wrap-around
897 */
898 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
899 wlvif->tx_security_last_seq_lsb = fw_lsb;
900 }
901
902 /* remove private header from packet */
903 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
904
905 /* remove TKIP header space if present */
906 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
907 info->control.hw_key &&
908 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
909 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
910 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
911 hdrlen);
912 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
913 }
914
915 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
916 " status 0x%x",
917 result->id, skb, result->ack_failures,
918 result->rate_class_index, result->status);
919
920 /* return the packet to the stack */
921 skb_queue_tail(&wl->deferred_tx_queue, skb);
922 queue_work(wl->freezable_wq, &wl->netstack_work);
923 wl1271_free_tx_id(wl, result->id);
924 }
925
926 /* Called upon reception of a TX complete interrupt */
927 int wlcore_tx_complete(struct wl1271 *wl)
928 {
929 struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
930 u32 count, fw_counter;
931 u32 i;
932 int ret;
933
934 /* read the tx results from the chipset */
935 ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
936 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
937 if (ret < 0)
938 goto out;
939
940 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
941
942 /* write host counter to chipset (to ack) */
943 ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
944 offsetof(struct wl1271_tx_hw_res_if,
945 tx_result_host_counter), fw_counter);
946 if (ret < 0)
947 goto out;
948
949 count = fw_counter - wl->tx_results_count;
950 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
951
952 /* verify that the result buffer is not getting overrun */
953 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
954 wl1271_warning("TX result overflow from chipset: %d", count);
955
956 /* process the results */
957 for (i = 0; i < count; i++) {
958 struct wl1271_tx_hw_res_descr *result;
959 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
960
961 /* process the packet */
962 result = &(wl->tx_res_if->tx_results_queue[offset]);
963 wl1271_tx_complete_packet(wl, result);
964
965 wl->tx_results_count++;
966 }
967
968 out:
969 return ret;
970 }
971 EXPORT_SYMBOL(wlcore_tx_complete);
972
973 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
974 {
975 struct sk_buff *skb;
976 int i;
977 unsigned long flags;
978 struct ieee80211_tx_info *info;
979 int total[NUM_TX_QUEUES];
980
981 for (i = 0; i < NUM_TX_QUEUES; i++) {
982 total[i] = 0;
983 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
984 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
985
986 if (!wl12xx_is_dummy_packet(wl, skb)) {
987 info = IEEE80211_SKB_CB(skb);
988 info->status.rates[0].idx = -1;
989 info->status.rates[0].count = 0;
990 ieee80211_tx_status_ni(wl->hw, skb);
991 }
992
993 total[i]++;
994 }
995 }
996
997 spin_lock_irqsave(&wl->wl_lock, flags);
998 for (i = 0; i < NUM_TX_QUEUES; i++)
999 wl->tx_queue_count[i] -= total[i];
1000 spin_unlock_irqrestore(&wl->wl_lock, flags);
1001
1002 wl1271_handle_tx_low_watermark(wl);
1003 }
1004
1005 /* caller must hold wl->mutex and TX must be stopped */
1006 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1007 {
1008 int i;
1009
1010 /* TX failure */
1011 for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
1012 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
1013 wl1271_free_sta(wl, wlvif, i);
1014 else
1015 wlvif->sta.ba_rx_bitmap = 0;
1016
1017 wl->links[i].allocated_pkts = 0;
1018 wl->links[i].prev_freed_pkts = 0;
1019 }
1020 wlvif->last_tx_hlid = 0;
1021
1022 }
1023 /* caller must hold wl->mutex and TX must be stopped */
1024 void wl12xx_tx_reset(struct wl1271 *wl)
1025 {
1026 int i;
1027 struct sk_buff *skb;
1028 struct ieee80211_tx_info *info;
1029
1030 /* only reset the queues if something bad happened */
1031 if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) {
1032 for (i = 0; i < WL12XX_MAX_LINKS; i++)
1033 wl1271_tx_reset_link_queues(wl, i);
1034
1035 for (i = 0; i < NUM_TX_QUEUES; i++)
1036 wl->tx_queue_count[i] = 0;
1037 }
1038
1039 /*
1040 * Make sure the driver is at a consistent state, in case this
1041 * function is called from a context other than interface removal.
1042 * This call will always wake the TX queues.
1043 */
1044 wl1271_handle_tx_low_watermark(wl);
1045
1046 for (i = 0; i < wl->num_tx_desc; i++) {
1047 if (wl->tx_frames[i] == NULL)
1048 continue;
1049
1050 skb = wl->tx_frames[i];
1051 wl1271_free_tx_id(wl, i);
1052 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1053
1054 if (!wl12xx_is_dummy_packet(wl, skb)) {
1055 /*
1056 * Remove private headers before passing the skb to
1057 * mac80211
1058 */
1059 info = IEEE80211_SKB_CB(skb);
1060 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1061 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1062 info->control.hw_key &&
1063 info->control.hw_key->cipher ==
1064 WLAN_CIPHER_SUITE_TKIP) {
1065 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1066 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1067 skb->data, hdrlen);
1068 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1069 }
1070
1071 info->status.rates[0].idx = -1;
1072 info->status.rates[0].count = 0;
1073
1074 ieee80211_tx_status_ni(wl->hw, skb);
1075 }
1076 }
1077 }
1078
1079 #define WL1271_TX_FLUSH_TIMEOUT 500000
1080
1081 /* caller must *NOT* hold wl->mutex */
1082 void wl1271_tx_flush(struct wl1271 *wl)
1083 {
1084 unsigned long timeout, start_time;
1085 int i;
1086 start_time = jiffies;
1087 timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1088
1089 /* only one flush should be in progress, for consistent queue state */
1090 mutex_lock(&wl->flush_mutex);
1091
1092 mutex_lock(&wl->mutex);
1093 if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1094 mutex_unlock(&wl->mutex);
1095 goto out;
1096 }
1097
1098 wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1099
1100 while (!time_after(jiffies, timeout)) {
1101 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1102 wl->tx_frames_cnt,
1103 wl1271_tx_total_queue_count(wl));
1104
1105 /* force Tx and give the driver some time to flush data */
1106 mutex_unlock(&wl->mutex);
1107 if (wl1271_tx_total_queue_count(wl))
1108 wl1271_tx_work(&wl->tx_work);
1109 msleep(20);
1110 mutex_lock(&wl->mutex);
1111
1112 if ((wl->tx_frames_cnt == 0) &&
1113 (wl1271_tx_total_queue_count(wl) == 0)) {
1114 wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1115 jiffies_to_msecs(jiffies - start_time));
1116 goto out_wake;
1117 }
1118 }
1119
1120 wl1271_warning("Unable to flush all TX buffers, "
1121 "timed out (timeout %d ms",
1122 WL1271_TX_FLUSH_TIMEOUT / 1000);
1123
1124 /* forcibly flush all Tx buffers on our queues */
1125 for (i = 0; i < WL12XX_MAX_LINKS; i++)
1126 wl1271_tx_reset_link_queues(wl, i);
1127
1128 out_wake:
1129 wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1130 mutex_unlock(&wl->mutex);
1131 out:
1132 mutex_unlock(&wl->flush_mutex);
1133 }
1134 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1135
1136 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1137 {
1138 if (WARN_ON(!rate_set))
1139 return 0;
1140
1141 return BIT(__ffs(rate_set));
1142 }
1143 EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1144
1145 void wlcore_stop_queue_locked(struct wl1271 *wl, u8 queue,
1146 enum wlcore_queue_stop_reason reason)
1147 {
1148 bool stopped = !!wl->queue_stop_reasons[queue];
1149
1150 /* queue should not be stopped for this reason */
1151 WARN_ON(test_and_set_bit(reason, &wl->queue_stop_reasons[queue]));
1152
1153 if (stopped)
1154 return;
1155
1156 ieee80211_stop_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1157 }
1158
1159 void wlcore_stop_queue(struct wl1271 *wl, u8 queue,
1160 enum wlcore_queue_stop_reason reason)
1161 {
1162 unsigned long flags;
1163
1164 spin_lock_irqsave(&wl->wl_lock, flags);
1165 wlcore_stop_queue_locked(wl, queue, reason);
1166 spin_unlock_irqrestore(&wl->wl_lock, flags);
1167 }
1168
1169 void wlcore_wake_queue(struct wl1271 *wl, u8 queue,
1170 enum wlcore_queue_stop_reason reason)
1171 {
1172 unsigned long flags;
1173
1174 spin_lock_irqsave(&wl->wl_lock, flags);
1175
1176 /* queue should not be clear for this reason */
1177 WARN_ON(!test_and_clear_bit(reason, &wl->queue_stop_reasons[queue]));
1178
1179 if (wl->queue_stop_reasons[queue])
1180 goto out;
1181
1182 ieee80211_wake_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1183
1184 out:
1185 spin_unlock_irqrestore(&wl->wl_lock, flags);
1186 }
1187
1188 void wlcore_stop_queues(struct wl1271 *wl,
1189 enum wlcore_queue_stop_reason reason)
1190 {
1191 int i;
1192
1193 for (i = 0; i < NUM_TX_QUEUES; i++)
1194 wlcore_stop_queue(wl, i, reason);
1195 }
1196 EXPORT_SYMBOL_GPL(wlcore_stop_queues);
1197
1198 void wlcore_wake_queues(struct wl1271 *wl,
1199 enum wlcore_queue_stop_reason reason)
1200 {
1201 int i;
1202
1203 for (i = 0; i < NUM_TX_QUEUES; i++)
1204 wlcore_wake_queue(wl, i, reason);
1205 }
1206 EXPORT_SYMBOL_GPL(wlcore_wake_queues);
1207
1208 void wlcore_reset_stopped_queues(struct wl1271 *wl)
1209 {
1210 int i;
1211 unsigned long flags;
1212
1213 spin_lock_irqsave(&wl->wl_lock, flags);
1214
1215 for (i = 0; i < NUM_TX_QUEUES; i++) {
1216 if (!wl->queue_stop_reasons[i])
1217 continue;
1218
1219 wl->queue_stop_reasons[i] = 0;
1220 ieee80211_wake_queue(wl->hw,
1221 wl1271_tx_get_mac80211_queue(i));
1222 }
1223
1224 spin_unlock_irqrestore(&wl->wl_lock, flags);
1225 }
1226
1227 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl, u8 queue,
1228 enum wlcore_queue_stop_reason reason)
1229 {
1230 return test_bit(reason, &wl->queue_stop_reasons[queue]);
1231 }
1232
1233 bool wlcore_is_queue_stopped(struct wl1271 *wl, u8 queue)
1234 {
1235 return !!wl->queue_stop_reasons[queue];
1236 }
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