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 | ||
dbe25cb5 | 114 | #if 0 |
b622d992 AN |
115 | static void wl1271_tx_regulate_link(struct wl1271 *wl, u8 hlid) |
116 | { | |
117 | bool fw_ps; | |
118 | u8 tx_blks; | |
119 | ||
120 | /* only regulate station links */ | |
121 | if (hlid < WL1271_AP_STA_HLID_START) | |
122 | return; | |
123 | ||
124 | fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map); | |
125 | tx_blks = wl->links[hlid].allocated_blks; | |
126 | ||
127 | /* | |
128 | * if in FW PS and there is enough data in FW we can put the link | |
129 | * into high-level PS and clean out its TX queues. | |
130 | */ | |
131 | if (fw_ps && tx_blks >= WL1271_PS_STA_MAX_BLOCKS) | |
132 | wl1271_ps_link_start(wl, hlid, true); | |
133 | } | |
dbe25cb5 | 134 | #endif |
b622d992 | 135 | |
a8c0ddb5 AN |
136 | u8 wl1271_tx_get_hlid(struct sk_buff *skb) |
137 | { | |
138 | struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb); | |
139 | ||
140 | if (control->control.sta) { | |
141 | struct wl1271_station *wl_sta; | |
142 | ||
143 | wl_sta = (struct wl1271_station *) | |
144 | control->control.sta->drv_priv; | |
145 | return wl_sta->hlid; | |
146 | } else { | |
147 | struct ieee80211_hdr *hdr; | |
148 | ||
149 | hdr = (struct ieee80211_hdr *)skb->data; | |
150 | if (ieee80211_is_mgmt(hdr->frame_control)) | |
151 | return WL1271_AP_GLOBAL_HLID; | |
152 | else | |
153 | return WL1271_AP_BROADCAST_HLID; | |
154 | } | |
155 | } | |
156 | ||
0da13da7 IY |
157 | static unsigned int wl12xx_calc_packet_alignment(struct wl1271 *wl, |
158 | unsigned int packet_length) | |
159 | { | |
160 | if (wl->quirks & WL12XX_QUIRK_BLOCKSIZE_ALIGNMENT) | |
161 | return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE); | |
162 | else | |
163 | return ALIGN(packet_length, WL1271_TX_ALIGN_TO); | |
164 | } | |
165 | ||
a19606b4 | 166 | static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra, |
09039f42 | 167 | u32 buf_offset, u8 hlid) |
f5fc0f86 LC |
168 | { |
169 | struct wl1271_tx_hw_descr *desc; | |
170 | u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra; | |
48a61477 | 171 | u32 len; |
5c9417f1 | 172 | u32 total_blocks; |
7bb5d6ce | 173 | int id, ret = -EBUSY; |
e7ddf549 | 174 | |
2920743a AN |
175 | /* we use 1 spare block */ |
176 | u32 spare_blocks = 1; | |
f5fc0f86 | 177 | |
a19606b4 | 178 | if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE) |
6c6e669e | 179 | return -EAGAIN; |
a19606b4 | 180 | |
f5fc0f86 | 181 | /* allocate free identifier for the packet */ |
25eeb9e3 | 182 | id = wl1271_alloc_tx_id(wl, skb); |
f5fc0f86 LC |
183 | if (id < 0) |
184 | return id; | |
185 | ||
186 | /* approximate the number of blocks required for this packet | |
187 | in the firmware */ | |
0da13da7 | 188 | len = wl12xx_calc_packet_alignment(wl, total_len); |
48a61477 SL |
189 | |
190 | total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE + | |
e7ddf549 | 191 | spare_blocks; |
48a61477 | 192 | |
f5fc0f86 LC |
193 | if (total_blocks <= wl->tx_blocks_available) { |
194 | desc = (struct wl1271_tx_hw_descr *)skb_push( | |
195 | skb, total_len - skb->len); | |
196 | ||
ae77eccf SL |
197 | /* HW descriptor fields change between wl127x and wl128x */ |
198 | if (wl->chip.id == CHIP_ID_1283_PG20) { | |
199 | desc->wl128x_mem.total_mem_blocks = total_blocks; | |
200 | } else { | |
e7ddf549 | 201 | desc->wl127x_mem.extra_blocks = spare_blocks; |
ae77eccf SL |
202 | desc->wl127x_mem.total_mem_blocks = total_blocks; |
203 | } | |
204 | ||
f5fc0f86 LC |
205 | desc->id = id; |
206 | ||
207 | wl->tx_blocks_available -= total_blocks; | |
7bb5d6ce | 208 | wl->tx_allocated_blocks += total_blocks; |
f5fc0f86 | 209 | |
09039f42 AN |
210 | if (wl->bss_type == BSS_TYPE_AP_BSS) |
211 | wl->links[hlid].allocated_blks += total_blocks; | |
212 | ||
f5fc0f86 LC |
213 | ret = 0; |
214 | ||
215 | wl1271_debug(DEBUG_TX, | |
216 | "tx_allocate: size: %d, blocks: %d, id: %d", | |
217 | total_len, total_blocks, id); | |
781608c4 | 218 | } else { |
25eeb9e3 | 219 | wl1271_free_tx_id(wl, id); |
781608c4 | 220 | } |
f5fc0f86 LC |
221 | |
222 | return ret; | |
223 | } | |
224 | ||
990f5de7 IY |
225 | static bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb) |
226 | { | |
227 | return wl->dummy_packet == skb; | |
228 | } | |
229 | ||
a19606b4 | 230 | static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb, |
09039f42 AN |
231 | u32 extra, struct ieee80211_tx_info *control, |
232 | u8 hlid) | |
f5fc0f86 | 233 | { |
ac5e1e39 | 234 | struct timespec ts; |
f5fc0f86 | 235 | struct wl1271_tx_hw_descr *desc; |
48a61477 | 236 | int aligned_len, ac, rate_idx; |
ac5e1e39 | 237 | s64 hosttime; |
d0f63b20 | 238 | u16 tx_attr; |
f5fc0f86 LC |
239 | |
240 | desc = (struct wl1271_tx_hw_descr *) skb->data; | |
241 | ||
1e2b7976 JO |
242 | /* relocate space for security header */ |
243 | if (extra) { | |
244 | void *framestart = skb->data + sizeof(*desc); | |
245 | u16 fc = *(u16 *)(framestart + extra); | |
d0f63b20 | 246 | int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc)); |
1e2b7976 JO |
247 | memmove(framestart, framestart + extra, hdrlen); |
248 | } | |
249 | ||
f5fc0f86 | 250 | /* configure packet life time */ |
ac5e1e39 JO |
251 | getnstimeofday(&ts); |
252 | hosttime = (timespec_to_ns(&ts) >> 10); | |
253 | desc->start_time = cpu_to_le32(hosttime - wl->time_offset); | |
c6c8a65d AN |
254 | |
255 | if (wl->bss_type != BSS_TYPE_AP_BSS) | |
256 | desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU); | |
257 | else | |
258 | desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU); | |
f5fc0f86 | 259 | |
db674d24 | 260 | /* queue */ |
c6999d83 | 261 | ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); |
db674d24 | 262 | desc->tid = skb->priority; |
c6c8a65d | 263 | |
990f5de7 | 264 | if (wl12xx_is_dummy_packet(wl, skb)) { |
ae47c45f SL |
265 | /* |
266 | * FW expects the dummy packet to have an invalid session id - | |
267 | * any session id that is different than the one set in the join | |
268 | */ | |
269 | tx_attr = ((~wl->session_counter) << | |
270 | TX_HW_ATTR_OFST_SESSION_COUNTER) & | |
271 | TX_HW_ATTR_SESSION_COUNTER; | |
272 | ||
273 | tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ; | |
ae47c45f SL |
274 | } else { |
275 | /* configure the tx attributes */ | |
276 | tx_attr = | |
277 | wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER; | |
278 | } | |
279 | ||
c6c8a65d | 280 | if (wl->bss_type != BSS_TYPE_AP_BSS) { |
09039f42 | 281 | desc->aid = hlid; |
c6c8a65d AN |
282 | |
283 | /* if the packets are destined for AP (have a STA entry) | |
284 | send them with AP rate policies, otherwise use default | |
285 | basic rates */ | |
286 | if (control->control.sta) | |
287 | rate_idx = ACX_TX_AP_FULL_RATE; | |
288 | else | |
289 | rate_idx = ACX_TX_BASIC_RATE; | |
290 | } else { | |
09039f42 AN |
291 | desc->hlid = hlid; |
292 | switch (hlid) { | |
293 | case WL1271_AP_GLOBAL_HLID: | |
294 | rate_idx = ACX_TX_AP_MODE_MGMT_RATE; | |
295 | break; | |
296 | case WL1271_AP_BROADCAST_HLID: | |
297 | rate_idx = ACX_TX_AP_MODE_BCST_RATE; | |
298 | break; | |
299 | default: | |
c6c8a65d | 300 | rate_idx = ac; |
09039f42 | 301 | break; |
c6c8a65d AN |
302 | } |
303 | } | |
304 | ||
305 | tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY; | |
f5fc0f86 LC |
306 | desc->reserved = 0; |
307 | ||
0da13da7 | 308 | aligned_len = wl12xx_calc_packet_alignment(wl, skb->len); |
48a61477 | 309 | |
0da13da7 | 310 | if (wl->chip.id == CHIP_ID_1283_PG20) { |
48a61477 SL |
311 | desc->wl128x_mem.extra_bytes = aligned_len - skb->len; |
312 | desc->length = cpu_to_le16(aligned_len >> 2); | |
ae77eccf SL |
313 | |
314 | wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d " | |
315 | "tx_attr: 0x%x len: %d life: %d mem: %d", | |
316 | desc->hlid, tx_attr, | |
317 | le16_to_cpu(desc->length), | |
318 | le16_to_cpu(desc->life_time), | |
319 | desc->wl128x_mem.total_mem_blocks); | |
48a61477 SL |
320 | } else { |
321 | int pad; | |
322 | ||
0da13da7 | 323 | /* Store the aligned length in terms of words */ |
48a61477 SL |
324 | desc->length = cpu_to_le16(aligned_len >> 2); |
325 | ||
326 | /* calculate number of padding bytes */ | |
327 | pad = aligned_len - skb->len; | |
328 | tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD; | |
f5fc0f86 | 329 | |
ae77eccf SL |
330 | wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d " |
331 | "tx_attr: 0x%x len: %d life: %d mem: %d", pad, | |
332 | desc->hlid, tx_attr, | |
333 | le16_to_cpu(desc->length), | |
334 | le16_to_cpu(desc->life_time), | |
335 | desc->wl127x_mem.total_mem_blocks); | |
48a61477 | 336 | } |
d0f63b20 LC |
337 | |
338 | desc->tx_attr = cpu_to_le16(tx_attr); | |
f5fc0f86 LC |
339 | } |
340 | ||
341 | /* caller must hold wl->mutex */ | |
a19606b4 IY |
342 | static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb, |
343 | u32 buf_offset) | |
f5fc0f86 LC |
344 | { |
345 | struct ieee80211_tx_info *info; | |
346 | u32 extra = 0; | |
347 | int ret = 0; | |
a19606b4 | 348 | u32 total_len; |
09039f42 | 349 | u8 hlid; |
f5fc0f86 LC |
350 | |
351 | if (!skb) | |
352 | return -EINVAL; | |
353 | ||
354 | info = IEEE80211_SKB_CB(skb); | |
355 | ||
356 | if (info->control.hw_key && | |
97359d12 | 357 | info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) |
f5fc0f86 LC |
358 | extra = WL1271_TKIP_IV_SPACE; |
359 | ||
360 | if (info->control.hw_key) { | |
7f179b46 AN |
361 | bool is_wep; |
362 | u8 idx = info->control.hw_key->hw_key_idx; | |
363 | u32 cipher = info->control.hw_key->cipher; | |
364 | ||
365 | is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) || | |
366 | (cipher == WLAN_CIPHER_SUITE_WEP104); | |
f5fc0f86 | 367 | |
7f179b46 AN |
368 | if (unlikely(is_wep && wl->default_key != idx)) { |
369 | ret = wl1271_set_default_wep_key(wl, idx); | |
f5fc0f86 LC |
370 | if (ret < 0) |
371 | return ret; | |
ee444cf0 | 372 | wl->default_key = idx; |
f5fc0f86 LC |
373 | } |
374 | } | |
375 | ||
09039f42 AN |
376 | if (wl->bss_type == BSS_TYPE_AP_BSS) |
377 | hlid = wl1271_tx_get_hlid(skb); | |
378 | else | |
379 | hlid = TX_HW_DEFAULT_AID; | |
380 | ||
381 | ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid); | |
f5fc0f86 LC |
382 | if (ret < 0) |
383 | return ret; | |
384 | ||
fae2fd76 AN |
385 | wl1271_tx_fill_hdr(wl, skb, extra, info, hlid); |
386 | ||
b622d992 | 387 | if (wl->bss_type == BSS_TYPE_AP_BSS) { |
99a2775d | 388 | wl1271_tx_ap_update_inconnection_sta(wl, skb); |
dbe25cb5 | 389 | #if 0 |
b622d992 | 390 | wl1271_tx_regulate_link(wl, hlid); |
dbe25cb5 | 391 | #endif |
c5745187 OBC |
392 | } else { |
393 | wl1271_tx_update_filters(wl, skb); | |
b622d992 | 394 | } |
99a2775d | 395 | |
a19606b4 | 396 | /* |
48a61477 SL |
397 | * The length of each packet is stored in terms of |
398 | * words. Thus, we must pad the skb data to make sure its | |
399 | * length is aligned. The number of padding bytes is computed | |
400 | * and set in wl1271_tx_fill_hdr. | |
401 | * In special cases, we want to align to a specific block size | |
402 | * (eg. for wl128x with SDIO we align to 256). | |
a19606b4 | 403 | */ |
0da13da7 | 404 | total_len = wl12xx_calc_packet_alignment(wl, skb->len); |
48a61477 | 405 | |
a19606b4 IY |
406 | memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len); |
407 | memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len); | |
f5fc0f86 | 408 | |
990f5de7 IY |
409 | /* Revert side effects in the dummy packet skb, so it can be reused */ |
410 | if (wl12xx_is_dummy_packet(wl, skb)) | |
411 | skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); | |
412 | ||
a19606b4 | 413 | return total_len; |
f5fc0f86 LC |
414 | } |
415 | ||
ebba60c6 | 416 | u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set) |
830fb67b JO |
417 | { |
418 | struct ieee80211_supported_band *band; | |
419 | u32 enabled_rates = 0; | |
420 | int bit; | |
421 | ||
422 | band = wl->hw->wiphy->bands[wl->band]; | |
423 | for (bit = 0; bit < band->n_bitrates; bit++) { | |
424 | if (rate_set & 0x1) | |
425 | enabled_rates |= band->bitrates[bit].hw_value; | |
426 | rate_set >>= 1; | |
427 | } | |
428 | ||
00d20100 | 429 | #ifdef CONFIG_WL12XX_HT |
18357850 SL |
430 | /* MCS rates indication are on bits 16 - 23 */ |
431 | rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates; | |
432 | ||
433 | for (bit = 0; bit < 8; bit++) { | |
434 | if (rate_set & 0x1) | |
435 | enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit); | |
436 | rate_set >>= 1; | |
437 | } | |
438 | #endif | |
439 | ||
830fb67b JO |
440 | return enabled_rates; |
441 | } | |
442 | ||
a8c0ddb5 | 443 | void wl1271_handle_tx_low_watermark(struct wl1271 *wl) |
2fe33e8c IY |
444 | { |
445 | unsigned long flags; | |
708bb3cf | 446 | int i; |
2fe33e8c | 447 | |
708bb3cf AN |
448 | for (i = 0; i < NUM_TX_QUEUES; i++) { |
449 | if (test_bit(i, &wl->stopped_queues_map) && | |
f1a46384 | 450 | wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) { |
708bb3cf AN |
451 | /* firmware buffer has space, restart queues */ |
452 | spin_lock_irqsave(&wl->wl_lock, flags); | |
453 | ieee80211_wake_queue(wl->hw, | |
454 | wl1271_tx_get_mac80211_queue(i)); | |
455 | clear_bit(i, &wl->stopped_queues_map); | |
456 | spin_unlock_irqrestore(&wl->wl_lock, flags); | |
457 | } | |
2fe33e8c IY |
458 | } |
459 | } | |
460 | ||
a8c0ddb5 | 461 | static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl) |
6742f554 JO |
462 | { |
463 | struct sk_buff *skb = NULL; | |
464 | unsigned long flags; | |
465 | ||
7bb5d6ce AN |
466 | skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VO]); |
467 | if (skb) | |
6742f554 | 468 | goto out; |
7bb5d6ce AN |
469 | skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VI]); |
470 | if (skb) | |
471 | goto out; | |
472 | skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BE]); | |
473 | if (skb) | |
474 | goto out; | |
475 | skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BK]); | |
6742f554 JO |
476 | |
477 | out: | |
478 | if (skb) { | |
f1a46384 | 479 | int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); |
6742f554 | 480 | spin_lock_irqsave(&wl->wl_lock, flags); |
f1a46384 | 481 | wl->tx_queue_count[q]--; |
6742f554 JO |
482 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
483 | } | |
484 | ||
485 | return skb; | |
486 | } | |
487 | ||
a8c0ddb5 AN |
488 | static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl) |
489 | { | |
490 | struct sk_buff *skb = NULL; | |
491 | unsigned long flags; | |
492 | int i, h, start_hlid; | |
493 | ||
494 | /* start from the link after the last one */ | |
495 | start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS; | |
496 | ||
497 | /* dequeue according to AC, round robin on each link */ | |
498 | for (i = 0; i < AP_MAX_LINKS; i++) { | |
499 | h = (start_hlid + i) % AP_MAX_LINKS; | |
500 | ||
7bb5d6ce | 501 | skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VO]); |
a8c0ddb5 | 502 | if (skb) |
7bb5d6ce AN |
503 | goto out; |
504 | skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VI]); | |
505 | if (skb) | |
506 | goto out; | |
507 | skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BE]); | |
508 | if (skb) | |
509 | goto out; | |
510 | skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BK]); | |
511 | if (skb) | |
512 | goto out; | |
a8c0ddb5 AN |
513 | } |
514 | ||
7bb5d6ce | 515 | out: |
a8c0ddb5 | 516 | if (skb) { |
f1a46384 | 517 | int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); |
a8c0ddb5 AN |
518 | wl->last_tx_hlid = h; |
519 | spin_lock_irqsave(&wl->wl_lock, flags); | |
f1a46384 | 520 | wl->tx_queue_count[q]--; |
a8c0ddb5 AN |
521 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
522 | } else { | |
523 | wl->last_tx_hlid = 0; | |
524 | } | |
525 | ||
526 | return skb; | |
527 | } | |
528 | ||
529 | static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl) | |
530 | { | |
990f5de7 IY |
531 | unsigned long flags; |
532 | struct sk_buff *skb = NULL; | |
533 | ||
a8c0ddb5 | 534 | if (wl->bss_type == BSS_TYPE_AP_BSS) |
990f5de7 IY |
535 | skb = wl1271_ap_skb_dequeue(wl); |
536 | else | |
537 | skb = wl1271_sta_skb_dequeue(wl); | |
a8c0ddb5 | 538 | |
990f5de7 IY |
539 | if (!skb && |
540 | test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) { | |
f1a46384 AN |
541 | int q; |
542 | ||
990f5de7 | 543 | skb = wl->dummy_packet; |
f1a46384 | 544 | q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); |
990f5de7 | 545 | spin_lock_irqsave(&wl->wl_lock, flags); |
f1a46384 | 546 | wl->tx_queue_count[q]--; |
990f5de7 IY |
547 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
548 | } | |
549 | ||
550 | return skb; | |
a8c0ddb5 AN |
551 | } |
552 | ||
6742f554 JO |
553 | static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb) |
554 | { | |
555 | unsigned long flags; | |
556 | int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); | |
557 | ||
990f5de7 IY |
558 | if (wl12xx_is_dummy_packet(wl, skb)) { |
559 | set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags); | |
560 | } else if (wl->bss_type == BSS_TYPE_AP_BSS) { | |
a8c0ddb5 AN |
561 | u8 hlid = wl1271_tx_get_hlid(skb); |
562 | skb_queue_head(&wl->links[hlid].tx_queue[q], skb); | |
563 | ||
564 | /* make sure we dequeue the same packet next time */ | |
565 | wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS; | |
566 | } else { | |
567 | skb_queue_head(&wl->tx_queue[q], skb); | |
568 | } | |
569 | ||
6742f554 | 570 | spin_lock_irqsave(&wl->wl_lock, flags); |
f1a46384 | 571 | wl->tx_queue_count[q]++; |
6742f554 JO |
572 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
573 | } | |
574 | ||
77ddaa10 EP |
575 | static bool wl1271_tx_is_data_present(struct sk_buff *skb) |
576 | { | |
577 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data); | |
578 | ||
579 | return ieee80211_is_data_present(hdr->frame_control); | |
580 | } | |
581 | ||
a522550a | 582 | void wl1271_tx_work_locked(struct wl1271 *wl) |
f5fc0f86 | 583 | { |
f5fc0f86 | 584 | struct sk_buff *skb; |
6c6e669e IY |
585 | u32 buf_offset = 0; |
586 | bool sent_packets = false; | |
77ddaa10 EP |
587 | bool had_data = false; |
588 | bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS); | |
f5fc0f86 LC |
589 | int ret; |
590 | ||
f5fc0f86 | 591 | if (unlikely(wl->state == WL1271_STATE_OFF)) |
c1b193eb | 592 | return; |
f5fc0f86 | 593 | |
6742f554 | 594 | while ((skb = wl1271_skb_dequeue(wl))) { |
77ddaa10 EP |
595 | if (wl1271_tx_is_data_present(skb)) |
596 | had_data = true; | |
597 | ||
a19606b4 | 598 | ret = wl1271_prepare_tx_frame(wl, skb, buf_offset); |
6c6e669e | 599 | if (ret == -EAGAIN) { |
a19606b4 | 600 | /* |
6c6e669e IY |
601 | * Aggregation buffer is full. |
602 | * Flush buffer and try again. | |
603 | */ | |
6742f554 | 604 | wl1271_skb_queue_head(wl, skb); |
6c6e669e | 605 | wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf, |
6742f554 | 606 | buf_offset, true); |
6c6e669e IY |
607 | sent_packets = true; |
608 | buf_offset = 0; | |
609 | continue; | |
610 | } else if (ret == -EBUSY) { | |
611 | /* | |
612 | * Firmware buffer is full. | |
a19606b4 IY |
613 | * Queue back last skb, and stop aggregating. |
614 | */ | |
6742f554 | 615 | wl1271_skb_queue_head(wl, skb); |
a522550a IY |
616 | /* No work left, avoid scheduling redundant tx work */ |
617 | set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags); | |
ffb591cd | 618 | goto out_ack; |
f5fc0f86 LC |
619 | } else if (ret < 0) { |
620 | dev_kfree_skb(skb); | |
ffb591cd | 621 | goto out_ack; |
f5fc0f86 | 622 | } |
a19606b4 IY |
623 | buf_offset += ret; |
624 | wl->tx_packets_count++; | |
f5fc0f86 LC |
625 | } |
626 | ||
ffb591cd | 627 | out_ack: |
a19606b4 IY |
628 | if (buf_offset) { |
629 | wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf, | |
630 | buf_offset, true); | |
6c6e669e IY |
631 | sent_packets = true; |
632 | } | |
633 | if (sent_packets) { | |
606ea9fa IY |
634 | /* |
635 | * Interrupt the firmware with the new packets. This is only | |
636 | * required for older hardware revisions | |
637 | */ | |
638 | if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION) | |
639 | wl1271_write32(wl, WL1271_HOST_WR_ACCESS, | |
640 | wl->tx_packets_count); | |
641 | ||
a8c0ddb5 | 642 | wl1271_handle_tx_low_watermark(wl); |
a19606b4 | 643 | } |
77ddaa10 EP |
644 | if (!is_ap && wl->conf.rx_streaming.interval && had_data && |
645 | (wl->conf.rx_streaming.always || | |
646 | test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) { | |
647 | u32 timeout = wl->conf.rx_streaming.duration; | |
648 | ||
649 | /* enable rx streaming */ | |
650 | if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags)) | |
651 | ieee80211_queue_work(wl->hw, | |
652 | &wl->rx_streaming_enable_work); | |
653 | ||
654 | mod_timer(&wl->rx_streaming_timer, | |
655 | jiffies + msecs_to_jiffies(timeout)); | |
656 | } | |
a522550a | 657 | } |
f5fc0f86 | 658 | |
a522550a IY |
659 | void wl1271_tx_work(struct work_struct *work) |
660 | { | |
661 | struct wl1271 *wl = container_of(work, struct wl1271, tx_work); | |
c1b193eb | 662 | int ret; |
a522550a IY |
663 | |
664 | mutex_lock(&wl->mutex); | |
c1b193eb EP |
665 | ret = wl1271_ps_elp_wakeup(wl); |
666 | if (ret < 0) | |
667 | goto out; | |
668 | ||
a522550a | 669 | wl1271_tx_work_locked(wl); |
c1b193eb | 670 | |
c75bbcdb | 671 | wl1271_ps_elp_sleep(wl); |
c1b193eb | 672 | out: |
f5fc0f86 LC |
673 | mutex_unlock(&wl->mutex); |
674 | } | |
675 | ||
676 | static void wl1271_tx_complete_packet(struct wl1271 *wl, | |
677 | struct wl1271_tx_hw_res_descr *result) | |
678 | { | |
f5fc0f86 LC |
679 | struct ieee80211_tx_info *info; |
680 | struct sk_buff *skb; | |
f5fc0f86 | 681 | int id = result->id; |
31627dc5 JO |
682 | int rate = -1; |
683 | u8 retries = 0; | |
f5fc0f86 LC |
684 | |
685 | /* check for id legality */ | |
ffb591cd | 686 | if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) { |
f5fc0f86 LC |
687 | wl1271_warning("TX result illegal id: %d", id); |
688 | return; | |
689 | } | |
690 | ||
691 | skb = wl->tx_frames[id]; | |
692 | info = IEEE80211_SKB_CB(skb); | |
693 | ||
990f5de7 | 694 | if (wl12xx_is_dummy_packet(wl, skb)) { |
ae47c45f SL |
695 | wl1271_free_tx_id(wl, id); |
696 | return; | |
697 | } | |
698 | ||
31627dc5 JO |
699 | /* update the TX status info */ |
700 | if (result->status == TX_SUCCESS) { | |
701 | if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) | |
f5fc0f86 | 702 | info->flags |= IEEE80211_TX_STAT_ACK; |
6a2de93b | 703 | rate = wl1271_rate_to_idx(result->rate_class_index, wl->band); |
31627dc5 JO |
704 | retries = result->ack_failures; |
705 | } else if (result->status == TX_RETRY_EXCEEDED) { | |
706 | wl->stats.excessive_retries++; | |
707 | retries = result->ack_failures; | |
f5fc0f86 LC |
708 | } |
709 | ||
31627dc5 JO |
710 | info->status.rates[0].idx = rate; |
711 | info->status.rates[0].count = retries; | |
712 | info->status.rates[0].flags = 0; | |
713 | info->status.ack_signal = -1; | |
714 | ||
f5fc0f86 LC |
715 | wl->stats.retry_count += result->ack_failures; |
716 | ||
b992c682 OK |
717 | /* |
718 | * update sequence number only when relevant, i.e. only in | |
719 | * sessions of TKIP, AES and GEM (not in open or WEP sessions) | |
720 | */ | |
721 | if (info->control.hw_key && | |
722 | (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP || | |
723 | info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP || | |
724 | info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) { | |
725 | u8 fw_lsb = result->tx_security_sequence_number_lsb; | |
726 | u8 cur_lsb = wl->tx_security_last_seq_lsb; | |
727 | ||
728 | /* | |
729 | * update security sequence number, taking care of potential | |
730 | * wrap-around | |
731 | */ | |
732 | wl->tx_security_seq += (fw_lsb - cur_lsb + 256) % 256; | |
733 | wl->tx_security_last_seq_lsb = fw_lsb; | |
734 | } | |
ac4e4ce5 | 735 | |
1e2b7976 JO |
736 | /* remove private header from packet */ |
737 | skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); | |
738 | ||
739 | /* remove TKIP header space if present */ | |
f5fc0f86 | 740 | if (info->control.hw_key && |
97359d12 | 741 | info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) { |
1e2b7976 JO |
742 | int hdrlen = ieee80211_get_hdrlen_from_skb(skb); |
743 | memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen); | |
744 | skb_pull(skb, WL1271_TKIP_IV_SPACE); | |
745 | } | |
f5fc0f86 LC |
746 | |
747 | wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x" | |
748 | " status 0x%x", | |
749 | result->id, skb, result->ack_failures, | |
750 | result->rate_class_index, result->status); | |
751 | ||
f5fc0f86 | 752 | /* return the packet to the stack */ |
a620865e | 753 | skb_queue_tail(&wl->deferred_tx_queue, skb); |
92ef8960 | 754 | queue_work(wl->freezable_wq, &wl->netstack_work); |
25eeb9e3 | 755 | wl1271_free_tx_id(wl, result->id); |
f5fc0f86 LC |
756 | } |
757 | ||
758 | /* Called upon reception of a TX complete interrupt */ | |
ffb591cd | 759 | void wl1271_tx_complete(struct wl1271 *wl) |
f5fc0f86 LC |
760 | { |
761 | struct wl1271_acx_mem_map *memmap = | |
762 | (struct wl1271_acx_mem_map *)wl->target_mem_map; | |
ffb591cd | 763 | u32 count, fw_counter; |
f5fc0f86 LC |
764 | u32 i; |
765 | ||
f5fc0f86 | 766 | /* read the tx results from the chipset */ |
7b048c52 TP |
767 | wl1271_read(wl, le32_to_cpu(memmap->tx_result), |
768 | wl->tx_res_if, sizeof(*wl->tx_res_if), false); | |
ffb591cd JO |
769 | fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter); |
770 | ||
771 | /* write host counter to chipset (to ack) */ | |
772 | wl1271_write32(wl, le32_to_cpu(memmap->tx_result) + | |
773 | offsetof(struct wl1271_tx_hw_res_if, | |
774 | tx_result_host_counter), fw_counter); | |
775 | ||
776 | count = fw_counter - wl->tx_results_count; | |
06f7bc7d | 777 | wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count); |
f5fc0f86 LC |
778 | |
779 | /* verify that the result buffer is not getting overrun */ | |
ffb591cd | 780 | if (unlikely(count > TX_HW_RESULT_QUEUE_LEN)) |
f5fc0f86 | 781 | wl1271_warning("TX result overflow from chipset: %d", count); |
f5fc0f86 LC |
782 | |
783 | /* process the results */ | |
784 | for (i = 0; i < count; i++) { | |
785 | struct wl1271_tx_hw_res_descr *result; | |
786 | u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK; | |
787 | ||
788 | /* process the packet */ | |
789 | result = &(wl->tx_res_if->tx_results_queue[offset]); | |
790 | wl1271_tx_complete_packet(wl, result); | |
791 | ||
792 | wl->tx_results_count++; | |
793 | } | |
f5fc0f86 LC |
794 | } |
795 | ||
a8c0ddb5 AN |
796 | void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid) |
797 | { | |
798 | struct sk_buff *skb; | |
f1a46384 | 799 | int i; |
a8c0ddb5 | 800 | unsigned long flags; |
1d36cd89 | 801 | struct ieee80211_tx_info *info; |
f1a46384 | 802 | int total[NUM_TX_QUEUES]; |
a8c0ddb5 AN |
803 | |
804 | for (i = 0; i < NUM_TX_QUEUES; i++) { | |
f1a46384 | 805 | total[i] = 0; |
a8c0ddb5 AN |
806 | while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) { |
807 | wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb); | |
1d36cd89 AN |
808 | info = IEEE80211_SKB_CB(skb); |
809 | info->status.rates[0].idx = -1; | |
810 | info->status.rates[0].count = 0; | |
c27d3acc | 811 | ieee80211_tx_status_ni(wl->hw, skb); |
f1a46384 | 812 | total[i]++; |
a8c0ddb5 AN |
813 | } |
814 | } | |
815 | ||
816 | spin_lock_irqsave(&wl->wl_lock, flags); | |
f1a46384 AN |
817 | for (i = 0; i < NUM_TX_QUEUES; i++) |
818 | wl->tx_queue_count[i] -= total[i]; | |
a8c0ddb5 AN |
819 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
820 | ||
821 | wl1271_handle_tx_low_watermark(wl); | |
822 | } | |
823 | ||
7dece1c8 AN |
824 | /* caller must hold wl->mutex and TX must be stopped */ |
825 | void wl1271_tx_reset(struct wl1271 *wl, bool reset_tx_queues) | |
f5fc0f86 LC |
826 | { |
827 | int i; | |
828 | struct sk_buff *skb; | |
1d36cd89 | 829 | struct ieee80211_tx_info *info; |
f5fc0f86 LC |
830 | |
831 | /* TX failure */ | |
a8c0ddb5 | 832 | if (wl->bss_type == BSS_TYPE_AP_BSS) { |
09039f42 | 833 | for (i = 0; i < AP_MAX_LINKS; i++) { |
a8c0ddb5 | 834 | wl1271_tx_reset_link_queues(wl, i); |
09039f42 AN |
835 | wl->links[i].allocated_blks = 0; |
836 | wl->links[i].prev_freed_blks = 0; | |
837 | } | |
a8c0ddb5 AN |
838 | |
839 | wl->last_tx_hlid = 0; | |
840 | } else { | |
841 | for (i = 0; i < NUM_TX_QUEUES; i++) { | |
842 | while ((skb = skb_dequeue(&wl->tx_queue[i]))) { | |
843 | wl1271_debug(DEBUG_TX, "freeing skb 0x%p", | |
844 | skb); | |
ae47c45f | 845 | |
990f5de7 | 846 | if (!wl12xx_is_dummy_packet(wl, skb)) { |
ae47c45f SL |
847 | info = IEEE80211_SKB_CB(skb); |
848 | info->status.rates[0].idx = -1; | |
849 | info->status.rates[0].count = 0; | |
c27d3acc | 850 | ieee80211_tx_status_ni(wl->hw, skb); |
ae47c45f | 851 | } |
a8c0ddb5 | 852 | } |
f1a46384 | 853 | wl->tx_queue_count[i] = 0; |
6742f554 | 854 | } |
f5fc0f86 | 855 | } |
a8c0ddb5 | 856 | |
708bb3cf | 857 | wl->stopped_queues_map = 0; |
f5fc0f86 | 858 | |
2fe33e8c IY |
859 | /* |
860 | * Make sure the driver is at a consistent state, in case this | |
861 | * function is called from a context other than interface removal. | |
7dece1c8 | 862 | * This call will always wake the TX queues. |
2fe33e8c | 863 | */ |
7dece1c8 AN |
864 | if (reset_tx_queues) |
865 | wl1271_handle_tx_low_watermark(wl); | |
2fe33e8c | 866 | |
50e9f746 IY |
867 | for (i = 0; i < ACX_TX_DESCRIPTORS; i++) { |
868 | if (wl->tx_frames[i] == NULL) | |
869 | continue; | |
870 | ||
871 | skb = wl->tx_frames[i]; | |
872 | wl1271_free_tx_id(wl, i); | |
873 | wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb); | |
874 | ||
990f5de7 | 875 | if (!wl12xx_is_dummy_packet(wl, skb)) { |
ae47c45f SL |
876 | /* |
877 | * Remove private headers before passing the skb to | |
878 | * mac80211 | |
879 | */ | |
880 | info = IEEE80211_SKB_CB(skb); | |
881 | skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); | |
882 | if (info->control.hw_key && | |
883 | info->control.hw_key->cipher == | |
884 | WLAN_CIPHER_SUITE_TKIP) { | |
885 | int hdrlen = ieee80211_get_hdrlen_from_skb(skb); | |
886 | memmove(skb->data + WL1271_TKIP_IV_SPACE, | |
887 | skb->data, hdrlen); | |
888 | skb_pull(skb, WL1271_TKIP_IV_SPACE); | |
889 | } | |
50e9f746 | 890 | |
ae47c45f SL |
891 | info->status.rates[0].idx = -1; |
892 | info->status.rates[0].count = 0; | |
50e9f746 | 893 | |
c27d3acc | 894 | ieee80211_tx_status_ni(wl->hw, skb); |
ae47c45f | 895 | } |
50e9f746 | 896 | } |
781608c4 JO |
897 | } |
898 | ||
899 | #define WL1271_TX_FLUSH_TIMEOUT 500000 | |
900 | ||
901 | /* caller must *NOT* hold wl->mutex */ | |
902 | void wl1271_tx_flush(struct wl1271 *wl) | |
903 | { | |
904 | unsigned long timeout; | |
905 | timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT); | |
906 | ||
907 | while (!time_after(jiffies, timeout)) { | |
908 | mutex_lock(&wl->mutex); | |
a8c0ddb5 | 909 | wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d", |
f1a46384 AN |
910 | wl->tx_frames_cnt, |
911 | wl1271_tx_total_queue_count(wl)); | |
912 | if ((wl->tx_frames_cnt == 0) && | |
913 | (wl1271_tx_total_queue_count(wl) == 0)) { | |
781608c4 JO |
914 | mutex_unlock(&wl->mutex); |
915 | return; | |
916 | } | |
917 | mutex_unlock(&wl->mutex); | |
918 | msleep(1); | |
919 | } | |
920 | ||
921 | wl1271_warning("Unable to flush all TX buffers, timed out."); | |
f5fc0f86 | 922 | } |
e0fe371b AN |
923 | |
924 | u32 wl1271_tx_min_rate_get(struct wl1271 *wl) | |
925 | { | |
926 | int i; | |
927 | u32 rate = 0; | |
928 | ||
929 | if (!wl->basic_rate_set) { | |
930 | WARN_ON(1); | |
931 | wl->basic_rate_set = wl->conf.tx.basic_rate; | |
932 | } | |
933 | ||
934 | for (i = 0; !rate; i++) { | |
935 | if ((wl->basic_rate_set >> i) & 0x1) | |
936 | rate = 1 << i; | |
937 | } | |
938 | ||
939 | return rate; | |
940 | } |