Commit | Line | Data |
---|---|---|
f5fc0f86 LC |
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> | |
c6c8a65d | 26 | #include <linux/etherdevice.h> |
f5fc0f86 | 27 | |
00d20100 SL |
28 | #include "wl12xx.h" |
29 | #include "io.h" | |
30 | #include "reg.h" | |
31 | #include "ps.h" | |
32 | #include "tx.h" | |
f5fc0f86 | 33 | |
7f179b46 AN |
34 | static int wl1271_set_default_wep_key(struct wl1271 *wl, u8 id) |
35 | { | |
36 | int ret; | |
37 | bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS); | |
38 | ||
39 | if (is_ap) | |
40 | ret = wl1271_cmd_set_ap_default_wep_key(wl, id); | |
41 | else | |
42 | ret = wl1271_cmd_set_sta_default_wep_key(wl, id); | |
43 | ||
44 | if (ret < 0) | |
45 | return ret; | |
46 | ||
47 | wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id); | |
48 | return 0; | |
49 | } | |
50 | ||
25eeb9e3 | 51 | static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb) |
f5fc0f86 | 52 | { |
25eeb9e3 IY |
53 | int id; |
54 | ||
55 | id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS); | |
56 | if (id >= ACX_TX_DESCRIPTORS) | |
57 | return -EBUSY; | |
58 | ||
59 | __set_bit(id, wl->tx_frames_map); | |
60 | wl->tx_frames[id] = skb; | |
61 | wl->tx_frames_cnt++; | |
62 | return id; | |
63 | } | |
f5fc0f86 | 64 | |
25eeb9e3 IY |
65 | static void wl1271_free_tx_id(struct wl1271 *wl, int id) |
66 | { | |
67 | if (__test_and_clear_bit(id, wl->tx_frames_map)) { | |
ef2e3004 IY |
68 | if (unlikely(wl->tx_frames_cnt == ACX_TX_DESCRIPTORS)) |
69 | clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags); | |
70 | ||
25eeb9e3 IY |
71 | wl->tx_frames[id] = NULL; |
72 | wl->tx_frames_cnt--; | |
73 | } | |
f5fc0f86 LC |
74 | } |
75 | ||
c5745187 OBC |
76 | static int wl1271_tx_update_filters(struct wl1271 *wl, |
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 | ||
84 | /* | |
85 | * stop bssid-based filtering before transmitting authentication | |
86 | * requests. this way the hw will never drop authentication | |
87 | * responses coming from BSSIDs it isn't familiar with (e.g. on | |
88 | * roaming) | |
89 | */ | |
90 | if (!ieee80211_is_auth(hdr->frame_control)) | |
91 | return 0; | |
92 | ||
93 | wl1271_configure_filters(wl, FIF_OTHER_BSS); | |
94 | ||
95 | return wl1271_acx_rx_config(wl, wl->rx_config, wl->rx_filter); | |
96 | } | |
97 | ||
99a2775d AN |
98 | static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl, |
99 | struct sk_buff *skb) | |
100 | { | |
101 | struct ieee80211_hdr *hdr; | |
102 | ||
103 | /* | |
104 | * add the station to the known list before transmitting the | |
105 | * authentication response. this way it won't get de-authed by FW | |
106 | * when transmitting too soon. | |
107 | */ | |
108 | hdr = (struct ieee80211_hdr *)(skb->data + | |
109 | sizeof(struct wl1271_tx_hw_descr)); | |
110 | if (ieee80211_is_auth(hdr->frame_control)) | |
111 | wl1271_acx_set_inconnection_sta(wl, hdr->addr1); | |
112 | } | |
113 | ||
b622d992 AN |
114 | static void wl1271_tx_regulate_link(struct wl1271 *wl, u8 hlid) |
115 | { | |
116 | bool fw_ps; | |
117 | u8 tx_blks; | |
118 | ||
119 | /* only regulate station links */ | |
120 | if (hlid < WL1271_AP_STA_HLID_START) | |
121 | return; | |
122 | ||
123 | fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map); | |
124 | tx_blks = wl->links[hlid].allocated_blks; | |
125 | ||
126 | /* | |
127 | * if in FW PS and there is enough data in FW we can put the link | |
128 | * into high-level PS and clean out its TX queues. | |
129 | */ | |
130 | if (fw_ps && tx_blks >= WL1271_PS_STA_MAX_BLOCKS) | |
131 | wl1271_ps_link_start(wl, hlid, true); | |
132 | } | |
133 | ||
a8c0ddb5 AN |
134 | u8 wl1271_tx_get_hlid(struct sk_buff *skb) |
135 | { | |
136 | struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb); | |
137 | ||
138 | if (control->control.sta) { | |
139 | struct wl1271_station *wl_sta; | |
140 | ||
141 | wl_sta = (struct wl1271_station *) | |
142 | control->control.sta->drv_priv; | |
143 | return wl_sta->hlid; | |
144 | } else { | |
145 | struct ieee80211_hdr *hdr; | |
146 | ||
147 | hdr = (struct ieee80211_hdr *)skb->data; | |
148 | if (ieee80211_is_mgmt(hdr->frame_control)) | |
149 | return WL1271_AP_GLOBAL_HLID; | |
150 | else | |
151 | return WL1271_AP_BROADCAST_HLID; | |
152 | } | |
153 | } | |
154 | ||
0da13da7 IY |
155 | static unsigned int wl12xx_calc_packet_alignment(struct wl1271 *wl, |
156 | unsigned int packet_length) | |
157 | { | |
158 | if (wl->quirks & WL12XX_QUIRK_BLOCKSIZE_ALIGNMENT) | |
159 | return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE); | |
160 | else | |
161 | return ALIGN(packet_length, WL1271_TX_ALIGN_TO); | |
162 | } | |
163 | ||
a19606b4 | 164 | static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra, |
09039f42 | 165 | u32 buf_offset, u8 hlid) |
f5fc0f86 LC |
166 | { |
167 | struct wl1271_tx_hw_descr *desc; | |
168 | u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra; | |
48a61477 | 169 | u32 len; |
5c9417f1 | 170 | u32 total_blocks; |
9e374a37 | 171 | int id, ret = -EBUSY, ac; |
e7ddf549 LC |
172 | u32 spare_blocks; |
173 | ||
174 | if (unlikely(wl->quirks & WL12XX_QUIRK_USE_2_SPARE_BLOCKS)) | |
175 | spare_blocks = 2; | |
176 | else | |
177 | spare_blocks = 1; | |
f5fc0f86 | 178 | |
a19606b4 | 179 | if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE) |
6c6e669e | 180 | return -EAGAIN; |
a19606b4 | 181 | |
f5fc0f86 | 182 | /* allocate free identifier for the packet */ |
25eeb9e3 | 183 | id = wl1271_alloc_tx_id(wl, skb); |
f5fc0f86 LC |
184 | if (id < 0) |
185 | return id; | |
186 | ||
187 | /* approximate the number of blocks required for this packet | |
188 | in the firmware */ | |
0da13da7 | 189 | len = wl12xx_calc_packet_alignment(wl, total_len); |
48a61477 SL |
190 | |
191 | total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE + | |
e7ddf549 | 192 | spare_blocks; |
48a61477 | 193 | |
f5fc0f86 LC |
194 | if (total_blocks <= wl->tx_blocks_available) { |
195 | desc = (struct wl1271_tx_hw_descr *)skb_push( | |
196 | skb, total_len - skb->len); | |
197 | ||
ae77eccf SL |
198 | /* HW descriptor fields change between wl127x and wl128x */ |
199 | if (wl->chip.id == CHIP_ID_1283_PG20) { | |
200 | desc->wl128x_mem.total_mem_blocks = total_blocks; | |
201 | } else { | |
e7ddf549 | 202 | desc->wl127x_mem.extra_blocks = spare_blocks; |
ae77eccf SL |
203 | desc->wl127x_mem.total_mem_blocks = total_blocks; |
204 | } | |
205 | ||
f5fc0f86 LC |
206 | desc->id = id; |
207 | ||
208 | wl->tx_blocks_available -= total_blocks; | |
9e374a37 AN |
209 | |
210 | ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); | |
211 | wl->tx_allocated_blocks[ac] += total_blocks; | |
f5fc0f86 | 212 | |
09039f42 AN |
213 | if (wl->bss_type == BSS_TYPE_AP_BSS) |
214 | wl->links[hlid].allocated_blks += total_blocks; | |
215 | ||
f5fc0f86 LC |
216 | ret = 0; |
217 | ||
218 | wl1271_debug(DEBUG_TX, | |
219 | "tx_allocate: size: %d, blocks: %d, id: %d", | |
220 | total_len, total_blocks, id); | |
781608c4 | 221 | } else { |
25eeb9e3 | 222 | wl1271_free_tx_id(wl, id); |
781608c4 | 223 | } |
f5fc0f86 LC |
224 | |
225 | return ret; | |
226 | } | |
227 | ||
990f5de7 IY |
228 | static bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb) |
229 | { | |
230 | return wl->dummy_packet == skb; | |
231 | } | |
232 | ||
a19606b4 | 233 | static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb, |
09039f42 AN |
234 | u32 extra, struct ieee80211_tx_info *control, |
235 | u8 hlid) | |
f5fc0f86 | 236 | { |
ac5e1e39 | 237 | struct timespec ts; |
f5fc0f86 | 238 | struct wl1271_tx_hw_descr *desc; |
48a61477 | 239 | int aligned_len, ac, rate_idx; |
ac5e1e39 | 240 | s64 hosttime; |
d0f63b20 | 241 | u16 tx_attr; |
f5fc0f86 LC |
242 | |
243 | desc = (struct wl1271_tx_hw_descr *) skb->data; | |
244 | ||
1e2b7976 JO |
245 | /* relocate space for security header */ |
246 | if (extra) { | |
247 | void *framestart = skb->data + sizeof(*desc); | |
248 | u16 fc = *(u16 *)(framestart + extra); | |
d0f63b20 | 249 | int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc)); |
1e2b7976 JO |
250 | memmove(framestart, framestart + extra, hdrlen); |
251 | } | |
252 | ||
f5fc0f86 | 253 | /* configure packet life time */ |
ac5e1e39 JO |
254 | getnstimeofday(&ts); |
255 | hosttime = (timespec_to_ns(&ts) >> 10); | |
256 | desc->start_time = cpu_to_le32(hosttime - wl->time_offset); | |
c6c8a65d AN |
257 | |
258 | if (wl->bss_type != BSS_TYPE_AP_BSS) | |
259 | desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU); | |
260 | else | |
261 | desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU); | |
f5fc0f86 | 262 | |
db674d24 | 263 | /* queue */ |
c6999d83 | 264 | ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); |
db674d24 | 265 | desc->tid = skb->priority; |
c6c8a65d | 266 | |
990f5de7 | 267 | if (wl12xx_is_dummy_packet(wl, skb)) { |
ae47c45f SL |
268 | /* |
269 | * FW expects the dummy packet to have an invalid session id - | |
270 | * any session id that is different than the one set in the join | |
271 | */ | |
272 | tx_attr = ((~wl->session_counter) << | |
273 | TX_HW_ATTR_OFST_SESSION_COUNTER) & | |
274 | TX_HW_ATTR_SESSION_COUNTER; | |
275 | ||
276 | tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ; | |
ae47c45f SL |
277 | } else { |
278 | /* configure the tx attributes */ | |
279 | tx_attr = | |
280 | wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER; | |
281 | } | |
282 | ||
c6c8a65d | 283 | if (wl->bss_type != BSS_TYPE_AP_BSS) { |
09039f42 | 284 | desc->aid = hlid; |
c6c8a65d AN |
285 | |
286 | /* if the packets are destined for AP (have a STA entry) | |
287 | send them with AP rate policies, otherwise use default | |
288 | basic rates */ | |
289 | if (control->control.sta) | |
290 | rate_idx = ACX_TX_AP_FULL_RATE; | |
291 | else | |
292 | rate_idx = ACX_TX_BASIC_RATE; | |
293 | } else { | |
09039f42 AN |
294 | desc->hlid = hlid; |
295 | switch (hlid) { | |
296 | case WL1271_AP_GLOBAL_HLID: | |
297 | rate_idx = ACX_TX_AP_MODE_MGMT_RATE; | |
298 | break; | |
299 | case WL1271_AP_BROADCAST_HLID: | |
300 | rate_idx = ACX_TX_AP_MODE_BCST_RATE; | |
301 | break; | |
302 | default: | |
c6c8a65d | 303 | rate_idx = ac; |
09039f42 | 304 | break; |
c6c8a65d AN |
305 | } |
306 | } | |
307 | ||
308 | tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY; | |
f5fc0f86 LC |
309 | desc->reserved = 0; |
310 | ||
0da13da7 | 311 | aligned_len = wl12xx_calc_packet_alignment(wl, skb->len); |
48a61477 | 312 | |
0da13da7 | 313 | if (wl->chip.id == CHIP_ID_1283_PG20) { |
48a61477 SL |
314 | desc->wl128x_mem.extra_bytes = aligned_len - skb->len; |
315 | desc->length = cpu_to_le16(aligned_len >> 2); | |
ae77eccf SL |
316 | |
317 | wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d " | |
318 | "tx_attr: 0x%x len: %d life: %d mem: %d", | |
319 | desc->hlid, tx_attr, | |
320 | le16_to_cpu(desc->length), | |
321 | le16_to_cpu(desc->life_time), | |
322 | desc->wl128x_mem.total_mem_blocks); | |
48a61477 SL |
323 | } else { |
324 | int pad; | |
325 | ||
0da13da7 | 326 | /* Store the aligned length in terms of words */ |
48a61477 SL |
327 | desc->length = cpu_to_le16(aligned_len >> 2); |
328 | ||
329 | /* calculate number of padding bytes */ | |
330 | pad = aligned_len - skb->len; | |
331 | tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD; | |
f5fc0f86 | 332 | |
ae77eccf SL |
333 | wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d " |
334 | "tx_attr: 0x%x len: %d life: %d mem: %d", pad, | |
335 | desc->hlid, tx_attr, | |
336 | le16_to_cpu(desc->length), | |
337 | le16_to_cpu(desc->life_time), | |
338 | desc->wl127x_mem.total_mem_blocks); | |
48a61477 | 339 | } |
d0f63b20 LC |
340 | |
341 | desc->tx_attr = cpu_to_le16(tx_attr); | |
f5fc0f86 LC |
342 | } |
343 | ||
344 | /* caller must hold wl->mutex */ | |
a19606b4 IY |
345 | static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb, |
346 | u32 buf_offset) | |
f5fc0f86 LC |
347 | { |
348 | struct ieee80211_tx_info *info; | |
349 | u32 extra = 0; | |
350 | int ret = 0; | |
a19606b4 | 351 | u32 total_len; |
09039f42 | 352 | u8 hlid; |
f5fc0f86 LC |
353 | |
354 | if (!skb) | |
355 | return -EINVAL; | |
356 | ||
357 | info = IEEE80211_SKB_CB(skb); | |
358 | ||
359 | if (info->control.hw_key && | |
97359d12 | 360 | info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) |
f5fc0f86 LC |
361 | extra = WL1271_TKIP_IV_SPACE; |
362 | ||
363 | if (info->control.hw_key) { | |
7f179b46 AN |
364 | bool is_wep; |
365 | u8 idx = info->control.hw_key->hw_key_idx; | |
366 | u32 cipher = info->control.hw_key->cipher; | |
367 | ||
368 | is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) || | |
369 | (cipher == WLAN_CIPHER_SUITE_WEP104); | |
f5fc0f86 | 370 | |
7f179b46 AN |
371 | if (unlikely(is_wep && wl->default_key != idx)) { |
372 | ret = wl1271_set_default_wep_key(wl, idx); | |
f5fc0f86 LC |
373 | if (ret < 0) |
374 | return ret; | |
ee444cf0 | 375 | wl->default_key = idx; |
f5fc0f86 LC |
376 | } |
377 | } | |
378 | ||
09039f42 AN |
379 | if (wl->bss_type == BSS_TYPE_AP_BSS) |
380 | hlid = wl1271_tx_get_hlid(skb); | |
381 | else | |
382 | hlid = TX_HW_DEFAULT_AID; | |
383 | ||
384 | ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid); | |
f5fc0f86 LC |
385 | if (ret < 0) |
386 | return ret; | |
387 | ||
fae2fd76 AN |
388 | wl1271_tx_fill_hdr(wl, skb, extra, info, hlid); |
389 | ||
b622d992 | 390 | if (wl->bss_type == BSS_TYPE_AP_BSS) { |
99a2775d | 391 | wl1271_tx_ap_update_inconnection_sta(wl, skb); |
b622d992 | 392 | wl1271_tx_regulate_link(wl, hlid); |
c5745187 OBC |
393 | } else { |
394 | wl1271_tx_update_filters(wl, skb); | |
b622d992 | 395 | } |
99a2775d | 396 | |
a19606b4 | 397 | /* |
48a61477 SL |
398 | * The length of each packet is stored in terms of |
399 | * words. Thus, we must pad the skb data to make sure its | |
400 | * length is aligned. The number of padding bytes is computed | |
401 | * and set in wl1271_tx_fill_hdr. | |
402 | * In special cases, we want to align to a specific block size | |
403 | * (eg. for wl128x with SDIO we align to 256). | |
a19606b4 | 404 | */ |
0da13da7 | 405 | total_len = wl12xx_calc_packet_alignment(wl, skb->len); |
48a61477 | 406 | |
a19606b4 IY |
407 | memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len); |
408 | memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len); | |
f5fc0f86 | 409 | |
990f5de7 IY |
410 | /* Revert side effects in the dummy packet skb, so it can be reused */ |
411 | if (wl12xx_is_dummy_packet(wl, skb)) | |
412 | skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); | |
413 | ||
a19606b4 | 414 | return total_len; |
f5fc0f86 LC |
415 | } |
416 | ||
ebba60c6 | 417 | u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set) |
830fb67b JO |
418 | { |
419 | struct ieee80211_supported_band *band; | |
420 | u32 enabled_rates = 0; | |
421 | int bit; | |
422 | ||
423 | band = wl->hw->wiphy->bands[wl->band]; | |
424 | for (bit = 0; bit < band->n_bitrates; bit++) { | |
425 | if (rate_set & 0x1) | |
426 | enabled_rates |= band->bitrates[bit].hw_value; | |
427 | rate_set >>= 1; | |
428 | } | |
429 | ||
00d20100 | 430 | #ifdef CONFIG_WL12XX_HT |
18357850 SL |
431 | /* MCS rates indication are on bits 16 - 23 */ |
432 | rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates; | |
433 | ||
434 | for (bit = 0; bit < 8; bit++) { | |
435 | if (rate_set & 0x1) | |
436 | enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit); | |
437 | rate_set >>= 1; | |
438 | } | |
439 | #endif | |
440 | ||
830fb67b JO |
441 | return enabled_rates; |
442 | } | |
443 | ||
a8c0ddb5 | 444 | void wl1271_handle_tx_low_watermark(struct wl1271 *wl) |
2fe33e8c IY |
445 | { |
446 | unsigned long flags; | |
708bb3cf | 447 | int i; |
2fe33e8c | 448 | |
708bb3cf AN |
449 | for (i = 0; i < NUM_TX_QUEUES; i++) { |
450 | if (test_bit(i, &wl->stopped_queues_map) && | |
f1a46384 | 451 | wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) { |
708bb3cf AN |
452 | /* firmware buffer has space, restart queues */ |
453 | spin_lock_irqsave(&wl->wl_lock, flags); | |
454 | ieee80211_wake_queue(wl->hw, | |
455 | wl1271_tx_get_mac80211_queue(i)); | |
456 | clear_bit(i, &wl->stopped_queues_map); | |
457 | spin_unlock_irqrestore(&wl->wl_lock, flags); | |
458 | } | |
2fe33e8c IY |
459 | } |
460 | } | |
461 | ||
9e374a37 AN |
462 | static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl, |
463 | struct sk_buff_head *queues) | |
464 | { | |
465 | int i, q = -1; | |
466 | u32 min_blks = 0xffffffff; | |
467 | ||
468 | /* | |
469 | * Find a non-empty ac where: | |
470 | * 1. There are packets to transmit | |
471 | * 2. The FW has the least allocated blocks | |
472 | */ | |
473 | for (i = 0; i < NUM_TX_QUEUES; i++) | |
474 | if (!skb_queue_empty(&queues[i]) && | |
475 | (wl->tx_allocated_blocks[i] < min_blks)) { | |
476 | q = i; | |
477 | min_blks = wl->tx_allocated_blocks[q]; | |
478 | } | |
479 | ||
480 | if (q == -1) | |
481 | return NULL; | |
482 | ||
483 | return &queues[q]; | |
484 | } | |
485 | ||
a8c0ddb5 | 486 | static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl) |
6742f554 JO |
487 | { |
488 | struct sk_buff *skb = NULL; | |
489 | unsigned long flags; | |
9e374a37 | 490 | struct sk_buff_head *queue; |
6742f554 | 491 | |
9e374a37 AN |
492 | queue = wl1271_select_queue(wl, wl->tx_queue); |
493 | if (!queue) | |
6742f554 | 494 | goto out; |
9e374a37 AN |
495 | |
496 | skb = skb_dequeue(queue); | |
6742f554 JO |
497 | |
498 | out: | |
499 | if (skb) { | |
f1a46384 | 500 | int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); |
6742f554 | 501 | spin_lock_irqsave(&wl->wl_lock, flags); |
f1a46384 | 502 | wl->tx_queue_count[q]--; |
6742f554 JO |
503 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
504 | } | |
505 | ||
506 | return skb; | |
507 | } | |
508 | ||
a8c0ddb5 AN |
509 | static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl) |
510 | { | |
511 | struct sk_buff *skb = NULL; | |
512 | unsigned long flags; | |
513 | int i, h, start_hlid; | |
9e374a37 | 514 | struct sk_buff_head *queue; |
a8c0ddb5 AN |
515 | |
516 | /* start from the link after the last one */ | |
517 | start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS; | |
518 | ||
519 | /* dequeue according to AC, round robin on each link */ | |
520 | for (i = 0; i < AP_MAX_LINKS; i++) { | |
521 | h = (start_hlid + i) % AP_MAX_LINKS; | |
522 | ||
9e374a37 AN |
523 | /* only consider connected stations */ |
524 | if (h >= WL1271_AP_STA_HLID_START && | |
525 | !test_bit(h - WL1271_AP_STA_HLID_START, wl->ap_hlid_map)) | |
526 | continue; | |
527 | ||
528 | queue = wl1271_select_queue(wl, wl->links[h].tx_queue); | |
529 | if (!queue) | |
530 | continue; | |
531 | ||
532 | skb = skb_dequeue(queue); | |
a8c0ddb5 | 533 | if (skb) |
9e374a37 | 534 | break; |
a8c0ddb5 AN |
535 | } |
536 | ||
a8c0ddb5 | 537 | if (skb) { |
f1a46384 | 538 | int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); |
a8c0ddb5 AN |
539 | wl->last_tx_hlid = h; |
540 | spin_lock_irqsave(&wl->wl_lock, flags); | |
f1a46384 | 541 | wl->tx_queue_count[q]--; |
a8c0ddb5 AN |
542 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
543 | } else { | |
544 | wl->last_tx_hlid = 0; | |
545 | } | |
546 | ||
547 | return skb; | |
548 | } | |
549 | ||
550 | static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl) | |
551 | { | |
990f5de7 IY |
552 | unsigned long flags; |
553 | struct sk_buff *skb = NULL; | |
554 | ||
a8c0ddb5 | 555 | if (wl->bss_type == BSS_TYPE_AP_BSS) |
990f5de7 IY |
556 | skb = wl1271_ap_skb_dequeue(wl); |
557 | else | |
558 | skb = wl1271_sta_skb_dequeue(wl); | |
a8c0ddb5 | 559 | |
990f5de7 IY |
560 | if (!skb && |
561 | test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) { | |
f1a46384 AN |
562 | int q; |
563 | ||
990f5de7 | 564 | skb = wl->dummy_packet; |
f1a46384 | 565 | q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); |
990f5de7 | 566 | spin_lock_irqsave(&wl->wl_lock, flags); |
f1a46384 | 567 | wl->tx_queue_count[q]--; |
990f5de7 IY |
568 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
569 | } | |
570 | ||
571 | return skb; | |
a8c0ddb5 AN |
572 | } |
573 | ||
6742f554 JO |
574 | static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb) |
575 | { | |
576 | unsigned long flags; | |
577 | int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); | |
578 | ||
990f5de7 IY |
579 | if (wl12xx_is_dummy_packet(wl, skb)) { |
580 | set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags); | |
581 | } else if (wl->bss_type == BSS_TYPE_AP_BSS) { | |
a8c0ddb5 AN |
582 | u8 hlid = wl1271_tx_get_hlid(skb); |
583 | skb_queue_head(&wl->links[hlid].tx_queue[q], skb); | |
584 | ||
585 | /* make sure we dequeue the same packet next time */ | |
586 | wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS; | |
587 | } else { | |
588 | skb_queue_head(&wl->tx_queue[q], skb); | |
589 | } | |
590 | ||
6742f554 | 591 | spin_lock_irqsave(&wl->wl_lock, flags); |
f1a46384 | 592 | wl->tx_queue_count[q]++; |
6742f554 JO |
593 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
594 | } | |
595 | ||
77ddaa10 EP |
596 | static bool wl1271_tx_is_data_present(struct sk_buff *skb) |
597 | { | |
598 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data); | |
599 | ||
600 | return ieee80211_is_data_present(hdr->frame_control); | |
601 | } | |
602 | ||
a522550a | 603 | void wl1271_tx_work_locked(struct wl1271 *wl) |
f5fc0f86 | 604 | { |
f5fc0f86 | 605 | struct sk_buff *skb; |
6c6e669e IY |
606 | u32 buf_offset = 0; |
607 | bool sent_packets = false; | |
77ddaa10 EP |
608 | bool had_data = false; |
609 | bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS); | |
f5fc0f86 LC |
610 | int ret; |
611 | ||
f5fc0f86 | 612 | if (unlikely(wl->state == WL1271_STATE_OFF)) |
c1b193eb | 613 | return; |
f5fc0f86 | 614 | |
6742f554 | 615 | while ((skb = wl1271_skb_dequeue(wl))) { |
77ddaa10 EP |
616 | if (wl1271_tx_is_data_present(skb)) |
617 | had_data = true; | |
618 | ||
a19606b4 | 619 | ret = wl1271_prepare_tx_frame(wl, skb, buf_offset); |
6c6e669e | 620 | if (ret == -EAGAIN) { |
a19606b4 | 621 | /* |
6c6e669e IY |
622 | * Aggregation buffer is full. |
623 | * Flush buffer and try again. | |
624 | */ | |
6742f554 | 625 | wl1271_skb_queue_head(wl, skb); |
6c6e669e | 626 | wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf, |
6742f554 | 627 | buf_offset, true); |
6c6e669e IY |
628 | sent_packets = true; |
629 | buf_offset = 0; | |
630 | continue; | |
631 | } else if (ret == -EBUSY) { | |
632 | /* | |
633 | * Firmware buffer is full. | |
a19606b4 IY |
634 | * Queue back last skb, and stop aggregating. |
635 | */ | |
6742f554 | 636 | wl1271_skb_queue_head(wl, skb); |
a522550a IY |
637 | /* No work left, avoid scheduling redundant tx work */ |
638 | set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags); | |
ffb591cd | 639 | goto out_ack; |
f5fc0f86 LC |
640 | } else if (ret < 0) { |
641 | dev_kfree_skb(skb); | |
ffb591cd | 642 | goto out_ack; |
f5fc0f86 | 643 | } |
a19606b4 IY |
644 | buf_offset += ret; |
645 | wl->tx_packets_count++; | |
f5fc0f86 LC |
646 | } |
647 | ||
ffb591cd | 648 | out_ack: |
a19606b4 IY |
649 | if (buf_offset) { |
650 | wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf, | |
651 | buf_offset, true); | |
6c6e669e IY |
652 | sent_packets = true; |
653 | } | |
654 | if (sent_packets) { | |
606ea9fa IY |
655 | /* |
656 | * Interrupt the firmware with the new packets. This is only | |
657 | * required for older hardware revisions | |
658 | */ | |
659 | if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION) | |
660 | wl1271_write32(wl, WL1271_HOST_WR_ACCESS, | |
661 | wl->tx_packets_count); | |
662 | ||
a8c0ddb5 | 663 | wl1271_handle_tx_low_watermark(wl); |
a19606b4 | 664 | } |
77ddaa10 EP |
665 | if (!is_ap && wl->conf.rx_streaming.interval && had_data && |
666 | (wl->conf.rx_streaming.always || | |
667 | test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) { | |
668 | u32 timeout = wl->conf.rx_streaming.duration; | |
669 | ||
670 | /* enable rx streaming */ | |
671 | if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags)) | |
672 | ieee80211_queue_work(wl->hw, | |
673 | &wl->rx_streaming_enable_work); | |
674 | ||
675 | mod_timer(&wl->rx_streaming_timer, | |
676 | jiffies + msecs_to_jiffies(timeout)); | |
677 | } | |
a522550a | 678 | } |
f5fc0f86 | 679 | |
a522550a IY |
680 | void wl1271_tx_work(struct work_struct *work) |
681 | { | |
682 | struct wl1271 *wl = container_of(work, struct wl1271, tx_work); | |
c1b193eb | 683 | int ret; |
a522550a IY |
684 | |
685 | mutex_lock(&wl->mutex); | |
c1b193eb EP |
686 | ret = wl1271_ps_elp_wakeup(wl); |
687 | if (ret < 0) | |
688 | goto out; | |
689 | ||
a522550a | 690 | wl1271_tx_work_locked(wl); |
c1b193eb | 691 | |
c75bbcdb | 692 | wl1271_ps_elp_sleep(wl); |
c1b193eb | 693 | out: |
f5fc0f86 LC |
694 | mutex_unlock(&wl->mutex); |
695 | } | |
696 | ||
697 | static void wl1271_tx_complete_packet(struct wl1271 *wl, | |
698 | struct wl1271_tx_hw_res_descr *result) | |
699 | { | |
f5fc0f86 LC |
700 | struct ieee80211_tx_info *info; |
701 | struct sk_buff *skb; | |
f5fc0f86 | 702 | int id = result->id; |
31627dc5 JO |
703 | int rate = -1; |
704 | u8 retries = 0; | |
f5fc0f86 LC |
705 | |
706 | /* check for id legality */ | |
ffb591cd | 707 | if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) { |
f5fc0f86 LC |
708 | wl1271_warning("TX result illegal id: %d", id); |
709 | return; | |
710 | } | |
711 | ||
712 | skb = wl->tx_frames[id]; | |
713 | info = IEEE80211_SKB_CB(skb); | |
714 | ||
990f5de7 | 715 | if (wl12xx_is_dummy_packet(wl, skb)) { |
ae47c45f SL |
716 | wl1271_free_tx_id(wl, id); |
717 | return; | |
718 | } | |
719 | ||
31627dc5 JO |
720 | /* update the TX status info */ |
721 | if (result->status == TX_SUCCESS) { | |
722 | if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) | |
f5fc0f86 | 723 | info->flags |= IEEE80211_TX_STAT_ACK; |
6a2de93b | 724 | rate = wl1271_rate_to_idx(result->rate_class_index, wl->band); |
31627dc5 JO |
725 | retries = result->ack_failures; |
726 | } else if (result->status == TX_RETRY_EXCEEDED) { | |
727 | wl->stats.excessive_retries++; | |
728 | retries = result->ack_failures; | |
f5fc0f86 LC |
729 | } |
730 | ||
31627dc5 JO |
731 | info->status.rates[0].idx = rate; |
732 | info->status.rates[0].count = retries; | |
733 | info->status.rates[0].flags = 0; | |
734 | info->status.ack_signal = -1; | |
735 | ||
f5fc0f86 LC |
736 | wl->stats.retry_count += result->ack_failures; |
737 | ||
b992c682 OK |
738 | /* |
739 | * update sequence number only when relevant, i.e. only in | |
740 | * sessions of TKIP, AES and GEM (not in open or WEP sessions) | |
741 | */ | |
742 | if (info->control.hw_key && | |
743 | (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP || | |
744 | info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP || | |
745 | info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) { | |
746 | u8 fw_lsb = result->tx_security_sequence_number_lsb; | |
747 | u8 cur_lsb = wl->tx_security_last_seq_lsb; | |
748 | ||
749 | /* | |
750 | * update security sequence number, taking care of potential | |
751 | * wrap-around | |
752 | */ | |
753 | wl->tx_security_seq += (fw_lsb - cur_lsb + 256) % 256; | |
754 | wl->tx_security_last_seq_lsb = fw_lsb; | |
755 | } | |
ac4e4ce5 | 756 | |
1e2b7976 JO |
757 | /* remove private header from packet */ |
758 | skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); | |
759 | ||
760 | /* remove TKIP header space if present */ | |
f5fc0f86 | 761 | if (info->control.hw_key && |
97359d12 | 762 | info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) { |
1e2b7976 JO |
763 | int hdrlen = ieee80211_get_hdrlen_from_skb(skb); |
764 | memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen); | |
765 | skb_pull(skb, WL1271_TKIP_IV_SPACE); | |
766 | } | |
f5fc0f86 LC |
767 | |
768 | wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x" | |
769 | " status 0x%x", | |
770 | result->id, skb, result->ack_failures, | |
771 | result->rate_class_index, result->status); | |
772 | ||
f5fc0f86 | 773 | /* return the packet to the stack */ |
a620865e | 774 | skb_queue_tail(&wl->deferred_tx_queue, skb); |
92ef8960 | 775 | queue_work(wl->freezable_wq, &wl->netstack_work); |
25eeb9e3 | 776 | wl1271_free_tx_id(wl, result->id); |
f5fc0f86 LC |
777 | } |
778 | ||
779 | /* Called upon reception of a TX complete interrupt */ | |
ffb591cd | 780 | void wl1271_tx_complete(struct wl1271 *wl) |
f5fc0f86 LC |
781 | { |
782 | struct wl1271_acx_mem_map *memmap = | |
783 | (struct wl1271_acx_mem_map *)wl->target_mem_map; | |
ffb591cd | 784 | u32 count, fw_counter; |
f5fc0f86 LC |
785 | u32 i; |
786 | ||
f5fc0f86 | 787 | /* read the tx results from the chipset */ |
7b048c52 TP |
788 | wl1271_read(wl, le32_to_cpu(memmap->tx_result), |
789 | wl->tx_res_if, sizeof(*wl->tx_res_if), false); | |
ffb591cd JO |
790 | fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter); |
791 | ||
792 | /* write host counter to chipset (to ack) */ | |
793 | wl1271_write32(wl, le32_to_cpu(memmap->tx_result) + | |
794 | offsetof(struct wl1271_tx_hw_res_if, | |
795 | tx_result_host_counter), fw_counter); | |
796 | ||
797 | count = fw_counter - wl->tx_results_count; | |
06f7bc7d | 798 | wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count); |
f5fc0f86 LC |
799 | |
800 | /* verify that the result buffer is not getting overrun */ | |
ffb591cd | 801 | if (unlikely(count > TX_HW_RESULT_QUEUE_LEN)) |
f5fc0f86 | 802 | wl1271_warning("TX result overflow from chipset: %d", count); |
f5fc0f86 LC |
803 | |
804 | /* process the results */ | |
805 | for (i = 0; i < count; i++) { | |
806 | struct wl1271_tx_hw_res_descr *result; | |
807 | u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK; | |
808 | ||
809 | /* process the packet */ | |
810 | result = &(wl->tx_res_if->tx_results_queue[offset]); | |
811 | wl1271_tx_complete_packet(wl, result); | |
812 | ||
813 | wl->tx_results_count++; | |
814 | } | |
f5fc0f86 LC |
815 | } |
816 | ||
a8c0ddb5 AN |
817 | void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid) |
818 | { | |
819 | struct sk_buff *skb; | |
f1a46384 | 820 | int i; |
a8c0ddb5 | 821 | unsigned long flags; |
1d36cd89 | 822 | struct ieee80211_tx_info *info; |
f1a46384 | 823 | int total[NUM_TX_QUEUES]; |
a8c0ddb5 AN |
824 | |
825 | for (i = 0; i < NUM_TX_QUEUES; i++) { | |
f1a46384 | 826 | total[i] = 0; |
a8c0ddb5 AN |
827 | while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) { |
828 | wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb); | |
1d36cd89 AN |
829 | info = IEEE80211_SKB_CB(skb); |
830 | info->status.rates[0].idx = -1; | |
831 | info->status.rates[0].count = 0; | |
c27d3acc | 832 | ieee80211_tx_status_ni(wl->hw, skb); |
f1a46384 | 833 | total[i]++; |
a8c0ddb5 AN |
834 | } |
835 | } | |
836 | ||
837 | spin_lock_irqsave(&wl->wl_lock, flags); | |
f1a46384 AN |
838 | for (i = 0; i < NUM_TX_QUEUES; i++) |
839 | wl->tx_queue_count[i] -= total[i]; | |
a8c0ddb5 AN |
840 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
841 | ||
842 | wl1271_handle_tx_low_watermark(wl); | |
843 | } | |
844 | ||
7dece1c8 AN |
845 | /* caller must hold wl->mutex and TX must be stopped */ |
846 | void wl1271_tx_reset(struct wl1271 *wl, bool reset_tx_queues) | |
f5fc0f86 LC |
847 | { |
848 | int i; | |
849 | struct sk_buff *skb; | |
1d36cd89 | 850 | struct ieee80211_tx_info *info; |
f5fc0f86 LC |
851 | |
852 | /* TX failure */ | |
a8c0ddb5 | 853 | if (wl->bss_type == BSS_TYPE_AP_BSS) { |
09039f42 | 854 | for (i = 0; i < AP_MAX_LINKS; i++) { |
a8c0ddb5 | 855 | wl1271_tx_reset_link_queues(wl, i); |
09039f42 AN |
856 | wl->links[i].allocated_blks = 0; |
857 | wl->links[i].prev_freed_blks = 0; | |
858 | } | |
a8c0ddb5 AN |
859 | |
860 | wl->last_tx_hlid = 0; | |
861 | } else { | |
862 | for (i = 0; i < NUM_TX_QUEUES; i++) { | |
863 | while ((skb = skb_dequeue(&wl->tx_queue[i]))) { | |
864 | wl1271_debug(DEBUG_TX, "freeing skb 0x%p", | |
865 | skb); | |
ae47c45f | 866 | |
990f5de7 | 867 | if (!wl12xx_is_dummy_packet(wl, skb)) { |
ae47c45f SL |
868 | info = IEEE80211_SKB_CB(skb); |
869 | info->status.rates[0].idx = -1; | |
870 | info->status.rates[0].count = 0; | |
c27d3acc | 871 | ieee80211_tx_status_ni(wl->hw, skb); |
ae47c45f | 872 | } |
a8c0ddb5 | 873 | } |
f1a46384 | 874 | wl->tx_queue_count[i] = 0; |
6742f554 | 875 | } |
f5fc0f86 | 876 | } |
a8c0ddb5 | 877 | |
708bb3cf | 878 | wl->stopped_queues_map = 0; |
f5fc0f86 | 879 | |
2fe33e8c IY |
880 | /* |
881 | * Make sure the driver is at a consistent state, in case this | |
882 | * function is called from a context other than interface removal. | |
7dece1c8 | 883 | * This call will always wake the TX queues. |
2fe33e8c | 884 | */ |
7dece1c8 AN |
885 | if (reset_tx_queues) |
886 | wl1271_handle_tx_low_watermark(wl); | |
2fe33e8c | 887 | |
50e9f746 IY |
888 | for (i = 0; i < ACX_TX_DESCRIPTORS; i++) { |
889 | if (wl->tx_frames[i] == NULL) | |
890 | continue; | |
891 | ||
892 | skb = wl->tx_frames[i]; | |
893 | wl1271_free_tx_id(wl, i); | |
894 | wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb); | |
895 | ||
990f5de7 | 896 | if (!wl12xx_is_dummy_packet(wl, skb)) { |
ae47c45f SL |
897 | /* |
898 | * Remove private headers before passing the skb to | |
899 | * mac80211 | |
900 | */ | |
901 | info = IEEE80211_SKB_CB(skb); | |
902 | skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); | |
903 | if (info->control.hw_key && | |
904 | info->control.hw_key->cipher == | |
905 | WLAN_CIPHER_SUITE_TKIP) { | |
906 | int hdrlen = ieee80211_get_hdrlen_from_skb(skb); | |
907 | memmove(skb->data + WL1271_TKIP_IV_SPACE, | |
908 | skb->data, hdrlen); | |
909 | skb_pull(skb, WL1271_TKIP_IV_SPACE); | |
910 | } | |
50e9f746 | 911 | |
ae47c45f SL |
912 | info->status.rates[0].idx = -1; |
913 | info->status.rates[0].count = 0; | |
50e9f746 | 914 | |
c27d3acc | 915 | ieee80211_tx_status_ni(wl->hw, skb); |
ae47c45f | 916 | } |
50e9f746 | 917 | } |
781608c4 JO |
918 | } |
919 | ||
920 | #define WL1271_TX_FLUSH_TIMEOUT 500000 | |
921 | ||
922 | /* caller must *NOT* hold wl->mutex */ | |
923 | void wl1271_tx_flush(struct wl1271 *wl) | |
924 | { | |
925 | unsigned long timeout; | |
926 | timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT); | |
927 | ||
928 | while (!time_after(jiffies, timeout)) { | |
929 | mutex_lock(&wl->mutex); | |
a8c0ddb5 | 930 | wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d", |
f1a46384 AN |
931 | wl->tx_frames_cnt, |
932 | wl1271_tx_total_queue_count(wl)); | |
933 | if ((wl->tx_frames_cnt == 0) && | |
934 | (wl1271_tx_total_queue_count(wl) == 0)) { | |
781608c4 JO |
935 | mutex_unlock(&wl->mutex); |
936 | return; | |
937 | } | |
938 | mutex_unlock(&wl->mutex); | |
939 | msleep(1); | |
940 | } | |
941 | ||
942 | wl1271_warning("Unable to flush all TX buffers, timed out."); | |
f5fc0f86 | 943 | } |
e0fe371b AN |
944 | |
945 | u32 wl1271_tx_min_rate_get(struct wl1271 *wl) | |
946 | { | |
947 | int i; | |
948 | u32 rate = 0; | |
949 | ||
950 | if (!wl->basic_rate_set) { | |
951 | WARN_ON(1); | |
952 | wl->basic_rate_set = wl->conf.tx.basic_rate; | |
953 | } | |
954 | ||
955 | for (i = 0; !rate; i++) { | |
956 | if ((wl->basic_rate_set >> i) & 0x1) | |
957 | rate = 1 << i; | |
958 | } | |
959 | ||
960 | return rate; | |
961 | } |