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 "wl12xx.h"
29 #include "debug.h"
30 #include "io.h"
31 #include "reg.h"
32 #include "ps.h"
33 #include "tx.h"
34 #include "event.h"
35
wl1271_set_default_wep_key(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 id)36 static int wl1271_set_default_wep_key(struct wl1271 *wl,
37 struct wl12xx_vif *wlvif, u8 id)
38 {
39 int ret;
40 bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
41
42 if (is_ap)
43 ret = wl12xx_cmd_set_default_wep_key(wl, id,
44 wlvif->ap.bcast_hlid);
45 else
46 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
47
48 if (ret < 0)
49 return ret;
50
51 wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
52 return 0;
53 }
54
wl1271_alloc_tx_id(struct wl1271 * wl,struct sk_buff * skb)55 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
56 {
57 int id;
58
59 id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
60 if (id >= ACX_TX_DESCRIPTORS)
61 return -EBUSY;
62
63 __set_bit(id, wl->tx_frames_map);
64 wl->tx_frames[id] = skb;
65 wl->tx_frames_cnt++;
66 return id;
67 }
68
wl1271_free_tx_id(struct wl1271 * wl,int id)69 static void wl1271_free_tx_id(struct wl1271 *wl, int id)
70 {
71 if (__test_and_clear_bit(id, wl->tx_frames_map)) {
72 if (unlikely(wl->tx_frames_cnt == ACX_TX_DESCRIPTORS))
73 clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
74
75 wl->tx_frames[id] = NULL;
76 wl->tx_frames_cnt--;
77 }
78 }
79
wl1271_tx_update_filters(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb)80 static int wl1271_tx_update_filters(struct wl1271 *wl,
81 struct wl12xx_vif *wlvif,
82 struct sk_buff *skb)
83 {
84 struct ieee80211_hdr *hdr;
85 int ret;
86
87 hdr = (struct ieee80211_hdr *)skb->data;
88
89 /*
90 * stop bssid-based filtering before transmitting authentication
91 * requests. this way the hw will never drop authentication
92 * responses coming from BSSIDs it isn't familiar with (e.g. on
93 * roaming)
94 */
95 if (!ieee80211_is_auth(hdr->frame_control))
96 return 0;
97
98 if (wlvif->dev_hlid != WL12XX_INVALID_LINK_ID)
99 goto out;
100
101 wl1271_debug(DEBUG_CMD, "starting device role for roaming");
102 ret = wl12xx_start_dev(wl, wlvif);
103 if (ret < 0)
104 goto out;
105 out:
106 return 0;
107 }
108
wl1271_tx_ap_update_inconnection_sta(struct wl1271 * wl,struct sk_buff * skb)109 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
110 struct sk_buff *skb)
111 {
112 struct ieee80211_hdr *hdr;
113
114 /*
115 * add the station to the known list before transmitting the
116 * authentication response. this way it won't get de-authed by FW
117 * when transmitting too soon.
118 */
119 hdr = (struct ieee80211_hdr *)(skb->data +
120 sizeof(struct wl1271_tx_hw_descr));
121 if (ieee80211_is_auth(hdr->frame_control))
122 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
123 }
124
wl1271_tx_regulate_link(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 hlid)125 static void wl1271_tx_regulate_link(struct wl1271 *wl,
126 struct wl12xx_vif *wlvif,
127 u8 hlid)
128 {
129 bool fw_ps, single_sta;
130 u8 tx_pkts;
131
132 if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
133 return;
134
135 fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
136 tx_pkts = wl->links[hlid].allocated_pkts;
137 single_sta = (wl->active_sta_count == 1);
138
139 /*
140 * if in FW PS and there is enough data in FW we can put the link
141 * into high-level PS and clean out its TX queues.
142 * Make an exception if this is the only connected station. In this
143 * case FW-memory congestion is not a problem.
144 */
145 if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
146 wl12xx_ps_link_start(wl, wlvif, hlid, true);
147 }
148
wl12xx_is_dummy_packet(struct wl1271 * wl,struct sk_buff * skb)149 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
150 {
151 return wl->dummy_packet == skb;
152 }
153
wl12xx_tx_get_hlid_ap(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb)154 u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
155 struct sk_buff *skb)
156 {
157 struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
158
159 if (control->control.sta) {
160 struct wl1271_station *wl_sta;
161
162 wl_sta = (struct wl1271_station *)
163 control->control.sta->drv_priv;
164 return wl_sta->hlid;
165 } else {
166 struct ieee80211_hdr *hdr;
167
168 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
169 return wl->system_hlid;
170
171 hdr = (struct ieee80211_hdr *)skb->data;
172 if (ieee80211_is_mgmt(hdr->frame_control))
173 return wlvif->ap.global_hlid;
174 else
175 return wlvif->ap.bcast_hlid;
176 }
177 }
178
wl12xx_tx_get_hlid(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb)179 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
180 struct sk_buff *skb)
181 {
182 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
183
184 if (!wlvif || wl12xx_is_dummy_packet(wl, skb))
185 return wl->system_hlid;
186
187 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
188 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb);
189
190 wl1271_tx_update_filters(wl, wlvif, skb);
191
192 if ((test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags) ||
193 test_bit(WLVIF_FLAG_IBSS_JOINED, &wlvif->flags)) &&
194 !ieee80211_is_auth(hdr->frame_control) &&
195 !ieee80211_is_assoc_req(hdr->frame_control))
196 return wlvif->sta.hlid;
197 else
198 return wlvif->dev_hlid;
199 }
200
wl12xx_calc_packet_alignment(struct wl1271 * wl,unsigned int packet_length)201 static unsigned int wl12xx_calc_packet_alignment(struct wl1271 *wl,
202 unsigned int packet_length)
203 {
204 if (wl->quirks & WL12XX_QUIRK_NO_BLOCKSIZE_ALIGNMENT)
205 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
206 else
207 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
208 }
209
wl1271_tx_allocate(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u32 extra,u32 buf_offset,u8 hlid)210 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
211 struct sk_buff *skb, u32 extra, u32 buf_offset,
212 u8 hlid)
213 {
214 struct wl1271_tx_hw_descr *desc;
215 u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
216 u32 len;
217 u32 total_blocks;
218 int id, ret = -EBUSY, ac;
219 u32 spare_blocks = wl->tx_spare_blocks;
220 bool is_dummy = false;
221
222 if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
223 return -EAGAIN;
224
225 /* allocate free identifier for the packet */
226 id = wl1271_alloc_tx_id(wl, skb);
227 if (id < 0)
228 return id;
229
230 /* approximate the number of blocks required for this packet
231 in the firmware */
232 len = wl12xx_calc_packet_alignment(wl, total_len);
233
234 /* in case of a dummy packet, use default amount of spare mem blocks */
235 if (unlikely(wl12xx_is_dummy_packet(wl, skb))) {
236 is_dummy = true;
237 spare_blocks = TX_HW_BLOCK_SPARE_DEFAULT;
238 }
239
240 total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE +
241 spare_blocks;
242
243 if (total_blocks <= wl->tx_blocks_available) {
244 desc = (struct wl1271_tx_hw_descr *)skb_push(
245 skb, total_len - skb->len);
246
247 /* HW descriptor fields change between wl127x and wl128x */
248 if (wl->chip.id == CHIP_ID_1283_PG20) {
249 desc->wl128x_mem.total_mem_blocks = total_blocks;
250 } else {
251 desc->wl127x_mem.extra_blocks = spare_blocks;
252 desc->wl127x_mem.total_mem_blocks = total_blocks;
253 }
254
255 desc->id = id;
256
257 wl->tx_blocks_available -= total_blocks;
258 wl->tx_allocated_blocks += total_blocks;
259
260 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
261 wl->tx_allocated_pkts[ac]++;
262
263 if (!is_dummy && wlvif &&
264 wlvif->bss_type == BSS_TYPE_AP_BSS &&
265 test_bit(hlid, wlvif->ap.sta_hlid_map))
266 wl->links[hlid].allocated_pkts++;
267
268 ret = 0;
269
270 wl1271_debug(DEBUG_TX,
271 "tx_allocate: size: %d, blocks: %d, id: %d",
272 total_len, total_blocks, id);
273 } else {
274 wl1271_free_tx_id(wl, id);
275 }
276
277 return ret;
278 }
279
wl1271_tx_fill_hdr(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u32 extra,struct ieee80211_tx_info * control,u8 hlid)280 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
281 struct sk_buff *skb, u32 extra,
282 struct ieee80211_tx_info *control, u8 hlid)
283 {
284 struct timespec ts;
285 struct wl1271_tx_hw_descr *desc;
286 int aligned_len, ac, rate_idx;
287 s64 hosttime;
288 u16 tx_attr = 0;
289 bool is_dummy;
290
291 desc = (struct wl1271_tx_hw_descr *) skb->data;
292
293 /* relocate space for security header */
294 if (extra) {
295 void *framestart = skb->data + sizeof(*desc);
296 u16 fc = *(u16 *)(framestart + extra);
297 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
298 memmove(framestart, framestart + extra, hdrlen);
299 }
300
301 /* configure packet life time */
302 getnstimeofday(&ts);
303 hosttime = (timespec_to_ns(&ts) >> 10);
304 desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
305
306 is_dummy = wl12xx_is_dummy_packet(wl, skb);
307 if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
308 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
309 else
310 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
311
312 /* queue */
313 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
314 desc->tid = skb->priority;
315
316 if (is_dummy) {
317 /*
318 * FW expects the dummy packet to have an invalid session id -
319 * any session id that is different than the one set in the join
320 */
321 tx_attr = (SESSION_COUNTER_INVALID <<
322 TX_HW_ATTR_OFST_SESSION_COUNTER) &
323 TX_HW_ATTR_SESSION_COUNTER;
324
325 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
326 } else if (wlvif) {
327 /* configure the tx attributes */
328 tx_attr = wlvif->session_counter <<
329 TX_HW_ATTR_OFST_SESSION_COUNTER;
330 }
331
332 desc->hlid = hlid;
333 if (is_dummy || !wlvif)
334 rate_idx = 0;
335 else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
336 /* if the packets are destined for AP (have a STA entry)
337 send them with AP rate policies, otherwise use default
338 basic rates */
339 if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
340 rate_idx = wlvif->sta.p2p_rate_idx;
341 else if (control->control.sta)
342 rate_idx = wlvif->sta.ap_rate_idx;
343 else
344 rate_idx = wlvif->sta.basic_rate_idx;
345 } else {
346 if (hlid == wlvif->ap.global_hlid)
347 rate_idx = wlvif->ap.mgmt_rate_idx;
348 else if (hlid == wlvif->ap.bcast_hlid)
349 rate_idx = wlvif->ap.bcast_rate_idx;
350 else
351 rate_idx = wlvif->ap.ucast_rate_idx[ac];
352 }
353
354 tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
355 desc->reserved = 0;
356
357 aligned_len = wl12xx_calc_packet_alignment(wl, skb->len);
358
359 if (wl->chip.id == CHIP_ID_1283_PG20) {
360 desc->wl128x_mem.extra_bytes = aligned_len - skb->len;
361 desc->length = cpu_to_le16(aligned_len >> 2);
362
363 wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d "
364 "tx_attr: 0x%x len: %d life: %d mem: %d",
365 desc->hlid, tx_attr,
366 le16_to_cpu(desc->length),
367 le16_to_cpu(desc->life_time),
368 desc->wl128x_mem.total_mem_blocks);
369 } else {
370 int pad;
371
372 /* Store the aligned length in terms of words */
373 desc->length = cpu_to_le16(aligned_len >> 2);
374
375 /* calculate number of padding bytes */
376 pad = aligned_len - skb->len;
377 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
378
379 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
380 "tx_attr: 0x%x len: %d life: %d mem: %d", pad,
381 desc->hlid, tx_attr,
382 le16_to_cpu(desc->length),
383 le16_to_cpu(desc->life_time),
384 desc->wl127x_mem.total_mem_blocks);
385 }
386
387 desc->tx_attr = cpu_to_le16(tx_attr);
388 }
389
390 /* caller must hold wl->mutex */
wl1271_prepare_tx_frame(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb,u32 buf_offset)391 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
392 struct sk_buff *skb, u32 buf_offset)
393 {
394 struct ieee80211_tx_info *info;
395 u32 extra = 0;
396 int ret = 0;
397 u32 total_len;
398 u8 hlid;
399 bool is_dummy;
400
401 if (!skb)
402 return -EINVAL;
403
404 info = IEEE80211_SKB_CB(skb);
405
406 /* TODO: handle dummy packets on multi-vifs */
407 is_dummy = wl12xx_is_dummy_packet(wl, skb);
408
409 if (info->control.hw_key &&
410 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
411 extra = WL1271_TKIP_IV_SPACE;
412
413 if (info->control.hw_key) {
414 bool is_wep;
415 u8 idx = info->control.hw_key->hw_key_idx;
416 u32 cipher = info->control.hw_key->cipher;
417
418 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
419 (cipher == WLAN_CIPHER_SUITE_WEP104);
420
421 if (unlikely(is_wep && wlvif->default_key != idx)) {
422 ret = wl1271_set_default_wep_key(wl, wlvif, idx);
423 if (ret < 0)
424 return ret;
425 wlvif->default_key = idx;
426 }
427 }
428 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
429 if (hlid == WL12XX_INVALID_LINK_ID) {
430 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
431 return -EINVAL;
432 }
433
434 ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid);
435 if (ret < 0)
436 return ret;
437
438 wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
439
440 if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
441 wl1271_tx_ap_update_inconnection_sta(wl, skb);
442 wl1271_tx_regulate_link(wl, wlvif, hlid);
443 }
444
445 /*
446 * The length of each packet is stored in terms of
447 * words. Thus, we must pad the skb data to make sure its
448 * length is aligned. The number of padding bytes is computed
449 * and set in wl1271_tx_fill_hdr.
450 * In special cases, we want to align to a specific block size
451 * (eg. for wl128x with SDIO we align to 256).
452 */
453 total_len = wl12xx_calc_packet_alignment(wl, skb->len);
454
455 memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
456 memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
457
458 /* Revert side effects in the dummy packet skb, so it can be reused */
459 if (is_dummy)
460 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
461
462 return total_len;
463 }
464
wl1271_tx_enabled_rates_get(struct wl1271 * wl,u32 rate_set,enum ieee80211_band rate_band)465 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
466 enum ieee80211_band rate_band)
467 {
468 struct ieee80211_supported_band *band;
469 u32 enabled_rates = 0;
470 int bit;
471
472 band = wl->hw->wiphy->bands[rate_band];
473 for (bit = 0; bit < band->n_bitrates; bit++) {
474 if (rate_set & 0x1)
475 enabled_rates |= band->bitrates[bit].hw_value;
476 rate_set >>= 1;
477 }
478
479 /* MCS rates indication are on bits 16 - 23 */
480 rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
481
482 for (bit = 0; bit < 8; bit++) {
483 if (rate_set & 0x1)
484 enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
485 rate_set >>= 1;
486 }
487
488 return enabled_rates;
489 }
490
wl1271_handle_tx_low_watermark(struct wl1271 * wl)491 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
492 {
493 unsigned long flags;
494 int i;
495
496 for (i = 0; i < NUM_TX_QUEUES; i++) {
497 if (test_bit(i, &wl->stopped_queues_map) &&
498 wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
499 /* firmware buffer has space, restart queues */
500 spin_lock_irqsave(&wl->wl_lock, flags);
501 ieee80211_wake_queue(wl->hw,
502 wl1271_tx_get_mac80211_queue(i));
503 clear_bit(i, &wl->stopped_queues_map);
504 spin_unlock_irqrestore(&wl->wl_lock, flags);
505 }
506 }
507 }
508
wl1271_select_queue(struct wl1271 * wl,struct sk_buff_head * queues)509 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
510 struct sk_buff_head *queues)
511 {
512 int i, q = -1, ac;
513 u32 min_pkts = 0xffffffff;
514
515 /*
516 * Find a non-empty ac where:
517 * 1. There are packets to transmit
518 * 2. The FW has the least allocated blocks
519 *
520 * We prioritize the ACs according to VO>VI>BE>BK
521 */
522 for (i = 0; i < NUM_TX_QUEUES; i++) {
523 ac = wl1271_tx_get_queue(i);
524 if (!skb_queue_empty(&queues[ac]) &&
525 (wl->tx_allocated_pkts[ac] < min_pkts)) {
526 q = ac;
527 min_pkts = wl->tx_allocated_pkts[q];
528 }
529 }
530
531 if (q == -1)
532 return NULL;
533
534 return &queues[q];
535 }
536
wl12xx_lnk_skb_dequeue(struct wl1271 * wl,struct wl1271_link * lnk)537 static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
538 struct wl1271_link *lnk)
539 {
540 struct sk_buff *skb;
541 unsigned long flags;
542 struct sk_buff_head *queue;
543
544 queue = wl1271_select_queue(wl, lnk->tx_queue);
545 if (!queue)
546 return NULL;
547
548 skb = skb_dequeue(queue);
549 if (skb) {
550 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
551 spin_lock_irqsave(&wl->wl_lock, flags);
552 wl->tx_queue_count[q]--;
553 spin_unlock_irqrestore(&wl->wl_lock, flags);
554 }
555
556 return skb;
557 }
558
wl12xx_vif_skb_dequeue(struct wl1271 * wl,struct wl12xx_vif * wlvif)559 static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
560 struct wl12xx_vif *wlvif)
561 {
562 struct sk_buff *skb = NULL;
563 int i, h, start_hlid;
564
565 /* start from the link after the last one */
566 start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
567
568 /* dequeue according to AC, round robin on each link */
569 for (i = 0; i < WL12XX_MAX_LINKS; i++) {
570 h = (start_hlid + i) % WL12XX_MAX_LINKS;
571
572 /* only consider connected stations */
573 if (!test_bit(h, wlvif->links_map))
574 continue;
575
576 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
577 if (!skb)
578 continue;
579
580 wlvif->last_tx_hlid = h;
581 break;
582 }
583
584 if (!skb)
585 wlvif->last_tx_hlid = 0;
586
587 return skb;
588 }
589
wl1271_skb_dequeue(struct wl1271 * wl)590 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
591 {
592 unsigned long flags;
593 struct wl12xx_vif *wlvif = wl->last_wlvif;
594 struct sk_buff *skb = NULL;
595
596 if (wlvif) {
597 wl12xx_for_each_wlvif_continue(wl, wlvif) {
598 skb = wl12xx_vif_skb_dequeue(wl, wlvif);
599 if (skb) {
600 wl->last_wlvif = wlvif;
601 break;
602 }
603 }
604 }
605
606 /* do another pass */
607 if (!skb) {
608 wl12xx_for_each_wlvif(wl, wlvif) {
609 skb = wl12xx_vif_skb_dequeue(wl, wlvif);
610 if (skb) {
611 wl->last_wlvif = wlvif;
612 break;
613 }
614 }
615 }
616
617 if (!skb)
618 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
619
620 if (!skb &&
621 test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
622 int q;
623
624 skb = wl->dummy_packet;
625 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
626 spin_lock_irqsave(&wl->wl_lock, flags);
627 wl->tx_queue_count[q]--;
628 spin_unlock_irqrestore(&wl->wl_lock, flags);
629 }
630
631 return skb;
632 }
633
wl1271_skb_queue_head(struct wl1271 * wl,struct wl12xx_vif * wlvif,struct sk_buff * skb)634 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
635 struct sk_buff *skb)
636 {
637 unsigned long flags;
638 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
639
640 if (wl12xx_is_dummy_packet(wl, skb)) {
641 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
642 } else {
643 u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
644 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
645
646 /* make sure we dequeue the same packet next time */
647 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
648 WL12XX_MAX_LINKS;
649 }
650
651 spin_lock_irqsave(&wl->wl_lock, flags);
652 wl->tx_queue_count[q]++;
653 spin_unlock_irqrestore(&wl->wl_lock, flags);
654 }
655
wl1271_tx_is_data_present(struct sk_buff * skb)656 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
657 {
658 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
659
660 return ieee80211_is_data_present(hdr->frame_control);
661 }
662
wl12xx_rearm_rx_streaming(struct wl1271 * wl,unsigned long * active_hlids)663 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
664 {
665 struct wl12xx_vif *wlvif;
666 u32 timeout;
667 u8 hlid;
668
669 if (!wl->conf.rx_streaming.interval)
670 return;
671
672 if (!wl->conf.rx_streaming.always &&
673 !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
674 return;
675
676 timeout = wl->conf.rx_streaming.duration;
677 wl12xx_for_each_wlvif_sta(wl, wlvif) {
678 bool found = false;
679 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
680 if (test_bit(hlid, wlvif->links_map)) {
681 found = true;
682 break;
683 }
684 }
685
686 if (!found)
687 continue;
688
689 /* enable rx streaming */
690 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
691 ieee80211_queue_work(wl->hw,
692 &wlvif->rx_streaming_enable_work);
693
694 mod_timer(&wlvif->rx_streaming_timer,
695 jiffies + msecs_to_jiffies(timeout));
696 }
697 }
698
wl1271_tx_work_locked(struct wl1271 * wl)699 void wl1271_tx_work_locked(struct wl1271 *wl)
700 {
701 struct wl12xx_vif *wlvif;
702 struct sk_buff *skb;
703 struct wl1271_tx_hw_descr *desc;
704 u32 buf_offset = 0;
705 bool sent_packets = false;
706 unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
707 int ret;
708
709 if (unlikely(wl->state == WL1271_STATE_OFF))
710 return;
711
712 while ((skb = wl1271_skb_dequeue(wl))) {
713 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
714 bool has_data = false;
715
716 wlvif = NULL;
717 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
718 wlvif = wl12xx_vif_to_data(info->control.vif);
719
720 has_data = wlvif && wl1271_tx_is_data_present(skb);
721 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset);
722 if (ret == -EAGAIN) {
723 /*
724 * Aggregation buffer is full.
725 * Flush buffer and try again.
726 */
727 wl1271_skb_queue_head(wl, wlvif, skb);
728 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
729 buf_offset, true);
730 sent_packets = true;
731 buf_offset = 0;
732 continue;
733 } else if (ret == -EBUSY) {
734 /*
735 * Firmware buffer is full.
736 * Queue back last skb, and stop aggregating.
737 */
738 wl1271_skb_queue_head(wl, wlvif, skb);
739 /* No work left, avoid scheduling redundant tx work */
740 set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
741 goto out_ack;
742 } else if (ret < 0) {
743 if (wl12xx_is_dummy_packet(wl, skb))
744 /*
745 * fw still expects dummy packet,
746 * so re-enqueue it
747 */
748 wl1271_skb_queue_head(wl, wlvif, skb);
749 else
750 ieee80211_free_txskb(wl->hw, skb);
751 goto out_ack;
752 }
753 buf_offset += ret;
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 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
764 buf_offset, true);
765 sent_packets = true;
766 }
767 if (sent_packets) {
768 /*
769 * Interrupt the firmware with the new packets. This is only
770 * required for older hardware revisions
771 */
772 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
773 wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
774 wl->tx_packets_count);
775
776 wl1271_handle_tx_low_watermark(wl);
777 }
778 wl12xx_rearm_rx_streaming(wl, active_hlids);
779 }
780
wl1271_tx_work(struct work_struct * work)781 void wl1271_tx_work(struct work_struct *work)
782 {
783 struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
784 int ret;
785
786 mutex_lock(&wl->mutex);
787 ret = wl1271_ps_elp_wakeup(wl);
788 if (ret < 0)
789 goto out;
790
791 wl1271_tx_work_locked(wl);
792
793 wl1271_ps_elp_sleep(wl);
794 out:
795 mutex_unlock(&wl->mutex);
796 }
797
wl1271_tx_complete_packet(struct wl1271 * wl,struct wl1271_tx_hw_res_descr * result)798 static void wl1271_tx_complete_packet(struct wl1271 *wl,
799 struct wl1271_tx_hw_res_descr *result)
800 {
801 struct ieee80211_tx_info *info;
802 struct ieee80211_vif *vif;
803 struct wl12xx_vif *wlvif;
804 struct sk_buff *skb;
805 int id = result->id;
806 int rate = -1;
807 u8 retries = 0;
808
809 /* check for id legality */
810 if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
811 wl1271_warning("TX result illegal id: %d", id);
812 return;
813 }
814
815 skb = wl->tx_frames[id];
816 info = IEEE80211_SKB_CB(skb);
817
818 if (wl12xx_is_dummy_packet(wl, skb)) {
819 wl1271_free_tx_id(wl, id);
820 return;
821 }
822
823 /* info->control is valid as long as we don't update info->status */
824 vif = info->control.vif;
825 wlvif = wl12xx_vif_to_data(vif);
826
827 /* update the TX status info */
828 if (result->status == TX_SUCCESS) {
829 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
830 info->flags |= IEEE80211_TX_STAT_ACK;
831 rate = wl1271_rate_to_idx(result->rate_class_index,
832 wlvif->band);
833 retries = result->ack_failures;
834 } else if (result->status == TX_RETRY_EXCEEDED) {
835 wl->stats.excessive_retries++;
836 retries = result->ack_failures;
837 }
838
839 info->status.rates[0].idx = rate;
840 info->status.rates[0].count = retries;
841 info->status.rates[0].flags = 0;
842 info->status.ack_signal = -1;
843
844 wl->stats.retry_count += result->ack_failures;
845
846 /*
847 * update sequence number only when relevant, i.e. only in
848 * sessions of TKIP, AES and GEM (not in open or WEP sessions)
849 */
850 if (info->control.hw_key &&
851 (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
852 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
853 info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
854 u8 fw_lsb = result->tx_security_sequence_number_lsb;
855 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
856
857 /*
858 * update security sequence number, taking care of potential
859 * wrap-around
860 */
861 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
862 wlvif->tx_security_last_seq_lsb = fw_lsb;
863 }
864
865 /* remove private header from packet */
866 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
867
868 /* remove TKIP header space if present */
869 if (info->control.hw_key &&
870 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
871 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
872 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
873 skb_pull(skb, WL1271_TKIP_IV_SPACE);
874 }
875
876 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
877 " status 0x%x",
878 result->id, skb, result->ack_failures,
879 result->rate_class_index, result->status);
880
881 /* return the packet to the stack */
882 skb_queue_tail(&wl->deferred_tx_queue, skb);
883 queue_work(wl->freezable_wq, &wl->netstack_work);
884 wl1271_free_tx_id(wl, result->id);
885 }
886
887 /* Called upon reception of a TX complete interrupt */
wl1271_tx_complete(struct wl1271 * wl)888 void wl1271_tx_complete(struct wl1271 *wl)
889 {
890 struct wl1271_acx_mem_map *memmap =
891 (struct wl1271_acx_mem_map *)wl->target_mem_map;
892 u32 count, fw_counter;
893 u32 i;
894
895 /* read the tx results from the chipset */
896 wl1271_read(wl, le32_to_cpu(memmap->tx_result),
897 wl->tx_res_if, sizeof(*wl->tx_res_if), false);
898 fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
899
900 /* write host counter to chipset (to ack) */
901 wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
902 offsetof(struct wl1271_tx_hw_res_if,
903 tx_result_host_counter), fw_counter);
904
905 count = fw_counter - wl->tx_results_count;
906 wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
907
908 /* verify that the result buffer is not getting overrun */
909 if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
910 wl1271_warning("TX result overflow from chipset: %d", count);
911
912 /* process the results */
913 for (i = 0; i < count; i++) {
914 struct wl1271_tx_hw_res_descr *result;
915 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
916
917 /* process the packet */
918 result = &(wl->tx_res_if->tx_results_queue[offset]);
919 wl1271_tx_complete_packet(wl, result);
920
921 wl->tx_results_count++;
922 }
923 }
924
wl1271_tx_reset_link_queues(struct wl1271 * wl,u8 hlid)925 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
926 {
927 struct sk_buff *skb;
928 int i;
929 unsigned long flags;
930 struct ieee80211_tx_info *info;
931 int total[NUM_TX_QUEUES];
932
933 for (i = 0; i < NUM_TX_QUEUES; i++) {
934 total[i] = 0;
935 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
936 wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
937
938 if (!wl12xx_is_dummy_packet(wl, skb)) {
939 info = IEEE80211_SKB_CB(skb);
940 info->status.rates[0].idx = -1;
941 info->status.rates[0].count = 0;
942 ieee80211_tx_status_ni(wl->hw, skb);
943 }
944
945 total[i]++;
946 }
947 }
948
949 spin_lock_irqsave(&wl->wl_lock, flags);
950 for (i = 0; i < NUM_TX_QUEUES; i++)
951 wl->tx_queue_count[i] -= total[i];
952 spin_unlock_irqrestore(&wl->wl_lock, flags);
953
954 wl1271_handle_tx_low_watermark(wl);
955 }
956
957 /* caller must hold wl->mutex and TX must be stopped */
wl12xx_tx_reset_wlvif(struct wl1271 * wl,struct wl12xx_vif * wlvif)958 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
959 {
960 int i;
961
962 /* TX failure */
963 for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
964 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
965 wl1271_free_sta(wl, wlvif, i);
966 else
967 wlvif->sta.ba_rx_bitmap = 0;
968
969 wl1271_tx_reset_link_queues(wl, i);
970 wl->links[i].allocated_pkts = 0;
971 wl->links[i].prev_freed_pkts = 0;
972 }
973 wlvif->last_tx_hlid = 0;
974
975 }
976 /* caller must hold wl->mutex and TX must be stopped */
wl12xx_tx_reset(struct wl1271 * wl,bool reset_tx_queues)977 void wl12xx_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
978 {
979 int i;
980 struct sk_buff *skb;
981 struct ieee80211_tx_info *info;
982
983 for (i = 0; i < NUM_TX_QUEUES; i++)
984 wl->tx_queue_count[i] = 0;
985
986 wl->stopped_queues_map = 0;
987
988 /*
989 * Make sure the driver is at a consistent state, in case this
990 * function is called from a context other than interface removal.
991 * This call will always wake the TX queues.
992 */
993 if (reset_tx_queues)
994 wl1271_handle_tx_low_watermark(wl);
995
996 for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
997 if (wl->tx_frames[i] == NULL)
998 continue;
999
1000 skb = wl->tx_frames[i];
1001 wl1271_free_tx_id(wl, i);
1002 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1003
1004 if (!wl12xx_is_dummy_packet(wl, skb)) {
1005 /*
1006 * Remove private headers before passing the skb to
1007 * mac80211
1008 */
1009 info = IEEE80211_SKB_CB(skb);
1010 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1011 if (info->control.hw_key &&
1012 info->control.hw_key->cipher ==
1013 WLAN_CIPHER_SUITE_TKIP) {
1014 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1015 memmove(skb->data + WL1271_TKIP_IV_SPACE,
1016 skb->data, hdrlen);
1017 skb_pull(skb, WL1271_TKIP_IV_SPACE);
1018 }
1019
1020 info->status.rates[0].idx = -1;
1021 info->status.rates[0].count = 0;
1022
1023 ieee80211_tx_status_ni(wl->hw, skb);
1024 }
1025 }
1026 }
1027
1028 #define WL1271_TX_FLUSH_TIMEOUT 500000
1029
1030 /* caller must *NOT* hold wl->mutex */
wl1271_tx_flush(struct wl1271 * wl)1031 void wl1271_tx_flush(struct wl1271 *wl)
1032 {
1033 unsigned long timeout;
1034 timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1035
1036 while (!time_after(jiffies, timeout)) {
1037 mutex_lock(&wl->mutex);
1038 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
1039 wl->tx_frames_cnt,
1040 wl1271_tx_total_queue_count(wl));
1041 if ((wl->tx_frames_cnt == 0) &&
1042 (wl1271_tx_total_queue_count(wl) == 0)) {
1043 mutex_unlock(&wl->mutex);
1044 return;
1045 }
1046 mutex_unlock(&wl->mutex);
1047 msleep(1);
1048 }
1049
1050 wl1271_warning("Unable to flush all TX buffers, timed out.");
1051 }
1052
wl1271_tx_min_rate_get(struct wl1271 * wl,u32 rate_set)1053 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1054 {
1055 if (WARN_ON(!rate_set))
1056 return 0;
1057
1058 return BIT(__ffs(rate_set));
1059 }
1060