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1 | /****************************************************************************** | |
2 | * | |
3 | * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA | |
17 | * | |
18 | * The full GNU General Public License is included in this distribution in the | |
19 | * file called LICENSE. | |
20 | * | |
21 | * Contact Information: | |
22 | * Intel Linux Wireless <ilw@linux.intel.com> | |
23 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 | |
24 | * | |
25 | *****************************************************************************/ | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/slab.h> | |
29 | #include <net/mac80211.h> | |
30 | ||
31 | #include <linux/netdevice.h> | |
32 | #include <linux/etherdevice.h> | |
33 | #include <linux/delay.h> | |
34 | ||
35 | #include <linux/workqueue.h> | |
36 | #include "rs.h" | |
37 | #include "fw-api.h" | |
38 | #include "sta.h" | |
39 | #include "iwl-op-mode.h" | |
40 | #include "mvm.h" | |
41 | ||
42 | #define RS_NAME "iwl-mvm-rs" | |
43 | ||
44 | #define NUM_TRY_BEFORE_ANT_TOGGLE 1 | |
45 | #define RS_LEGACY_RETRIES_PER_RATE 1 | |
46 | #define RS_HT_VHT_RETRIES_PER_RATE 2 | |
47 | #define RS_HT_VHT_RETRIES_PER_RATE_TW 1 | |
48 | #define RS_INITIAL_MIMO_NUM_RATES 3 | |
49 | #define RS_INITIAL_SISO_NUM_RATES 3 | |
50 | #define RS_INITIAL_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM | |
51 | #define RS_SECONDARY_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM | |
52 | #define RS_SECONDARY_SISO_NUM_RATES 3 | |
53 | #define RS_SECONDARY_SISO_RETRIES 1 | |
54 | ||
55 | #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ | |
56 | #define IWL_RATE_MIN_FAILURE_TH 3 /* min failures to calc tpt */ | |
57 | #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ | |
58 | ||
59 | /* max allowed rate miss before sync LQ cmd */ | |
60 | #define IWL_MISSED_RATE_MAX 15 | |
61 | #define RS_STAY_IN_COLUMN_TIMEOUT (5*HZ) | |
62 | #define RS_IDLE_TIMEOUT (5*HZ) | |
63 | ||
64 | static u8 rs_ht_to_legacy[] = { | |
65 | [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, | |
66 | [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, | |
67 | [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, | |
68 | [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, | |
69 | [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, | |
70 | [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, | |
71 | [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, | |
72 | [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, | |
73 | [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, | |
74 | [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, | |
75 | }; | |
76 | ||
77 | static const u8 ant_toggle_lookup[] = { | |
78 | [ANT_NONE] = ANT_NONE, | |
79 | [ANT_A] = ANT_B, | |
80 | [ANT_B] = ANT_C, | |
81 | [ANT_AB] = ANT_BC, | |
82 | [ANT_C] = ANT_A, | |
83 | [ANT_AC] = ANT_AB, | |
84 | [ANT_BC] = ANT_AC, | |
85 | [ANT_ABC] = ANT_ABC, | |
86 | }; | |
87 | ||
88 | #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ | |
89 | [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ | |
90 | IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ | |
91 | IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ | |
92 | IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ | |
93 | IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ | |
94 | IWL_RATE_##rp##M_INDEX, \ | |
95 | IWL_RATE_##rn##M_INDEX } | |
96 | ||
97 | #define IWL_DECLARE_MCS_RATE(s) \ | |
98 | [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ | |
99 | IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ | |
100 | IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ | |
101 | IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ | |
102 | IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ | |
103 | IWL_RATE_INVM_INDEX, \ | |
104 | IWL_RATE_INVM_INDEX } | |
105 | ||
106 | /* | |
107 | * Parameter order: | |
108 | * rate, ht rate, prev rate, next rate | |
109 | * | |
110 | * If there isn't a valid next or previous rate then INV is used which | |
111 | * maps to IWL_RATE_INVALID | |
112 | * | |
113 | */ | |
114 | static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { | |
115 | IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ | |
116 | IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ | |
117 | IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ | |
118 | IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ | |
119 | IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ | |
120 | IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ | |
121 | IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ | |
122 | IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ | |
123 | IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ | |
124 | IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ | |
125 | IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ | |
126 | IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ | |
127 | IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ | |
128 | IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ | |
129 | IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ | |
130 | }; | |
131 | ||
132 | enum rs_action { | |
133 | RS_ACTION_STAY = 0, | |
134 | RS_ACTION_DOWNSCALE = -1, | |
135 | RS_ACTION_UPSCALE = 1, | |
136 | }; | |
137 | ||
138 | enum rs_column_mode { | |
139 | RS_INVALID = 0, | |
140 | RS_LEGACY, | |
141 | RS_SISO, | |
142 | RS_MIMO2, | |
143 | }; | |
144 | ||
145 | #define MAX_NEXT_COLUMNS 7 | |
146 | #define MAX_COLUMN_CHECKS 3 | |
147 | ||
148 | typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, | |
149 | struct ieee80211_sta *sta, | |
150 | struct iwl_scale_tbl_info *tbl); | |
151 | ||
152 | struct rs_tx_column { | |
153 | enum rs_column_mode mode; | |
154 | u8 ant; | |
155 | bool sgi; | |
156 | enum rs_column next_columns[MAX_NEXT_COLUMNS]; | |
157 | allow_column_func_t checks[MAX_COLUMN_CHECKS]; | |
158 | }; | |
159 | ||
160 | static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, | |
161 | struct iwl_scale_tbl_info *tbl) | |
162 | { | |
163 | if (!sta->ht_cap.ht_supported) | |
164 | return false; | |
165 | ||
166 | if (sta->smps_mode == IEEE80211_SMPS_STATIC) | |
167 | return false; | |
168 | ||
169 | if (num_of_ant(mvm->fw->valid_tx_ant) < 2) | |
170 | return false; | |
171 | ||
172 | if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) | |
173 | return false; | |
174 | ||
175 | return true; | |
176 | } | |
177 | ||
178 | static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, | |
179 | struct iwl_scale_tbl_info *tbl) | |
180 | { | |
181 | if (!sta->ht_cap.ht_supported) | |
182 | return false; | |
183 | ||
184 | return true; | |
185 | } | |
186 | ||
187 | static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, | |
188 | struct iwl_scale_tbl_info *tbl) | |
189 | { | |
190 | struct rs_rate *rate = &tbl->rate; | |
191 | struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; | |
192 | struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; | |
193 | ||
194 | if (is_ht20(rate) && (ht_cap->cap & | |
195 | IEEE80211_HT_CAP_SGI_20)) | |
196 | return true; | |
197 | if (is_ht40(rate) && (ht_cap->cap & | |
198 | IEEE80211_HT_CAP_SGI_40)) | |
199 | return true; | |
200 | if (is_ht80(rate) && (vht_cap->cap & | |
201 | IEEE80211_VHT_CAP_SHORT_GI_80)) | |
202 | return true; | |
203 | ||
204 | return false; | |
205 | } | |
206 | ||
207 | static const struct rs_tx_column rs_tx_columns[] = { | |
208 | [RS_COLUMN_LEGACY_ANT_A] = { | |
209 | .mode = RS_LEGACY, | |
210 | .ant = ANT_A, | |
211 | .next_columns = { | |
212 | RS_COLUMN_LEGACY_ANT_B, | |
213 | RS_COLUMN_SISO_ANT_A, | |
214 | RS_COLUMN_SISO_ANT_B, | |
215 | RS_COLUMN_INVALID, | |
216 | RS_COLUMN_INVALID, | |
217 | RS_COLUMN_INVALID, | |
218 | RS_COLUMN_INVALID, | |
219 | }, | |
220 | }, | |
221 | [RS_COLUMN_LEGACY_ANT_B] = { | |
222 | .mode = RS_LEGACY, | |
223 | .ant = ANT_B, | |
224 | .next_columns = { | |
225 | RS_COLUMN_LEGACY_ANT_A, | |
226 | RS_COLUMN_SISO_ANT_A, | |
227 | RS_COLUMN_SISO_ANT_B, | |
228 | RS_COLUMN_INVALID, | |
229 | RS_COLUMN_INVALID, | |
230 | RS_COLUMN_INVALID, | |
231 | RS_COLUMN_INVALID, | |
232 | }, | |
233 | }, | |
234 | [RS_COLUMN_SISO_ANT_A] = { | |
235 | .mode = RS_SISO, | |
236 | .ant = ANT_A, | |
237 | .next_columns = { | |
238 | RS_COLUMN_SISO_ANT_B, | |
239 | RS_COLUMN_MIMO2, | |
240 | RS_COLUMN_SISO_ANT_A_SGI, | |
241 | RS_COLUMN_SISO_ANT_B_SGI, | |
242 | RS_COLUMN_LEGACY_ANT_A, | |
243 | RS_COLUMN_LEGACY_ANT_B, | |
244 | RS_COLUMN_INVALID, | |
245 | }, | |
246 | .checks = { | |
247 | rs_siso_allow, | |
248 | }, | |
249 | }, | |
250 | [RS_COLUMN_SISO_ANT_B] = { | |
251 | .mode = RS_SISO, | |
252 | .ant = ANT_B, | |
253 | .next_columns = { | |
254 | RS_COLUMN_SISO_ANT_A, | |
255 | RS_COLUMN_MIMO2, | |
256 | RS_COLUMN_SISO_ANT_B_SGI, | |
257 | RS_COLUMN_SISO_ANT_A_SGI, | |
258 | RS_COLUMN_LEGACY_ANT_A, | |
259 | RS_COLUMN_LEGACY_ANT_B, | |
260 | RS_COLUMN_INVALID, | |
261 | }, | |
262 | .checks = { | |
263 | rs_siso_allow, | |
264 | }, | |
265 | }, | |
266 | [RS_COLUMN_SISO_ANT_A_SGI] = { | |
267 | .mode = RS_SISO, | |
268 | .ant = ANT_A, | |
269 | .sgi = true, | |
270 | .next_columns = { | |
271 | RS_COLUMN_SISO_ANT_B_SGI, | |
272 | RS_COLUMN_MIMO2_SGI, | |
273 | RS_COLUMN_SISO_ANT_A, | |
274 | RS_COLUMN_SISO_ANT_B, | |
275 | RS_COLUMN_MIMO2, | |
276 | RS_COLUMN_LEGACY_ANT_A, | |
277 | RS_COLUMN_LEGACY_ANT_B, | |
278 | }, | |
279 | .checks = { | |
280 | rs_siso_allow, | |
281 | rs_sgi_allow, | |
282 | }, | |
283 | }, | |
284 | [RS_COLUMN_SISO_ANT_B_SGI] = { | |
285 | .mode = RS_SISO, | |
286 | .ant = ANT_B, | |
287 | .sgi = true, | |
288 | .next_columns = { | |
289 | RS_COLUMN_SISO_ANT_A_SGI, | |
290 | RS_COLUMN_MIMO2_SGI, | |
291 | RS_COLUMN_SISO_ANT_B, | |
292 | RS_COLUMN_SISO_ANT_A, | |
293 | RS_COLUMN_MIMO2, | |
294 | RS_COLUMN_LEGACY_ANT_A, | |
295 | RS_COLUMN_LEGACY_ANT_B, | |
296 | }, | |
297 | .checks = { | |
298 | rs_siso_allow, | |
299 | rs_sgi_allow, | |
300 | }, | |
301 | }, | |
302 | [RS_COLUMN_MIMO2] = { | |
303 | .mode = RS_MIMO2, | |
304 | .ant = ANT_AB, | |
305 | .next_columns = { | |
306 | RS_COLUMN_SISO_ANT_A, | |
307 | RS_COLUMN_SISO_ANT_B, | |
308 | RS_COLUMN_SISO_ANT_A_SGI, | |
309 | RS_COLUMN_SISO_ANT_B_SGI, | |
310 | RS_COLUMN_MIMO2_SGI, | |
311 | RS_COLUMN_LEGACY_ANT_A, | |
312 | RS_COLUMN_LEGACY_ANT_B, | |
313 | }, | |
314 | .checks = { | |
315 | rs_mimo_allow, | |
316 | }, | |
317 | }, | |
318 | [RS_COLUMN_MIMO2_SGI] = { | |
319 | .mode = RS_MIMO2, | |
320 | .ant = ANT_AB, | |
321 | .sgi = true, | |
322 | .next_columns = { | |
323 | RS_COLUMN_SISO_ANT_A_SGI, | |
324 | RS_COLUMN_SISO_ANT_B_SGI, | |
325 | RS_COLUMN_SISO_ANT_A, | |
326 | RS_COLUMN_SISO_ANT_B, | |
327 | RS_COLUMN_MIMO2, | |
328 | RS_COLUMN_LEGACY_ANT_A, | |
329 | RS_COLUMN_LEGACY_ANT_B, | |
330 | }, | |
331 | .checks = { | |
332 | rs_mimo_allow, | |
333 | rs_sgi_allow, | |
334 | }, | |
335 | }, | |
336 | }; | |
337 | ||
338 | static inline u8 rs_extract_rate(u32 rate_n_flags) | |
339 | { | |
340 | /* also works for HT because bits 7:6 are zero there */ | |
341 | return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); | |
342 | } | |
343 | ||
344 | static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) | |
345 | { | |
346 | int idx = 0; | |
347 | ||
348 | if (rate_n_flags & RATE_MCS_HT_MSK) { | |
349 | idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; | |
350 | idx += IWL_RATE_MCS_0_INDEX; | |
351 | ||
352 | /* skip 9M not supported in HT*/ | |
353 | if (idx >= IWL_RATE_9M_INDEX) | |
354 | idx += 1; | |
355 | if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) | |
356 | return idx; | |
357 | } else if (rate_n_flags & RATE_MCS_VHT_MSK) { | |
358 | idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; | |
359 | idx += IWL_RATE_MCS_0_INDEX; | |
360 | ||
361 | /* skip 9M not supported in VHT*/ | |
362 | if (idx >= IWL_RATE_9M_INDEX) | |
363 | idx++; | |
364 | if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) | |
365 | return idx; | |
366 | } else { | |
367 | /* legacy rate format, search for match in table */ | |
368 | ||
369 | u8 legacy_rate = rs_extract_rate(rate_n_flags); | |
370 | for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) | |
371 | if (iwl_rates[idx].plcp == legacy_rate) | |
372 | return idx; | |
373 | } | |
374 | ||
375 | return IWL_RATE_INVALID; | |
376 | } | |
377 | ||
378 | static void rs_rate_scale_perform(struct iwl_mvm *mvm, | |
379 | struct sk_buff *skb, | |
380 | struct ieee80211_sta *sta, | |
381 | struct iwl_lq_sta *lq_sta); | |
382 | static void rs_fill_lq_cmd(struct iwl_mvm *mvm, | |
383 | struct ieee80211_sta *sta, | |
384 | struct iwl_lq_sta *lq_sta, | |
385 | const struct rs_rate *initial_rate); | |
386 | static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); | |
387 | ||
388 | /** | |
389 | * The following tables contain the expected throughput metrics for all rates | |
390 | * | |
391 | * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits | |
392 | * | |
393 | * where invalid entries are zeros. | |
394 | * | |
395 | * CCK rates are only valid in legacy table and will only be used in G | |
396 | * (2.4 GHz) band. | |
397 | */ | |
398 | ||
399 | static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { | |
400 | 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 | |
401 | }; | |
402 | ||
403 | /* Expected TpT tables. 4 indexes: | |
404 | * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI | |
405 | */ | |
406 | static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { | |
407 | {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, | |
408 | {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, | |
409 | {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, | |
410 | {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, | |
411 | }; | |
412 | ||
413 | static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { | |
414 | {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, | |
415 | {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, | |
416 | {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, | |
417 | {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, | |
418 | }; | |
419 | ||
420 | static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { | |
421 | {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, | |
422 | {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, | |
423 | {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, | |
424 | {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, | |
425 | }; | |
426 | ||
427 | static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { | |
428 | {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, | |
429 | {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, | |
430 | {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, | |
431 | {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, | |
432 | }; | |
433 | ||
434 | static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { | |
435 | {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, | |
436 | {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, | |
437 | {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, | |
438 | {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, | |
439 | }; | |
440 | ||
441 | static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { | |
442 | {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, | |
443 | {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, | |
444 | {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, | |
445 | {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, | |
446 | }; | |
447 | ||
448 | /* mbps, mcs */ | |
449 | static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { | |
450 | { "1", "BPSK DSSS"}, | |
451 | { "2", "QPSK DSSS"}, | |
452 | {"5.5", "BPSK CCK"}, | |
453 | { "11", "QPSK CCK"}, | |
454 | { "6", "BPSK 1/2"}, | |
455 | { "9", "BPSK 1/2"}, | |
456 | { "12", "QPSK 1/2"}, | |
457 | { "18", "QPSK 3/4"}, | |
458 | { "24", "16QAM 1/2"}, | |
459 | { "36", "16QAM 3/4"}, | |
460 | { "48", "64QAM 2/3"}, | |
461 | { "54", "64QAM 3/4"}, | |
462 | { "60", "64QAM 5/6"}, | |
463 | }; | |
464 | ||
465 | #define MCS_INDEX_PER_STREAM (8) | |
466 | ||
467 | static const char *rs_pretty_ant(u8 ant) | |
468 | { | |
469 | static const char * const ant_name[] = { | |
470 | [ANT_NONE] = "None", | |
471 | [ANT_A] = "A", | |
472 | [ANT_B] = "B", | |
473 | [ANT_AB] = "AB", | |
474 | [ANT_C] = "C", | |
475 | [ANT_AC] = "AC", | |
476 | [ANT_BC] = "BC", | |
477 | [ANT_ABC] = "ABC", | |
478 | }; | |
479 | ||
480 | if (ant > ANT_ABC) | |
481 | return "UNKNOWN"; | |
482 | ||
483 | return ant_name[ant]; | |
484 | } | |
485 | ||
486 | static const char *rs_pretty_lq_type(enum iwl_table_type type) | |
487 | { | |
488 | static const char * const lq_types[] = { | |
489 | [LQ_NONE] = "NONE", | |
490 | [LQ_LEGACY_A] = "LEGACY_A", | |
491 | [LQ_LEGACY_G] = "LEGACY_G", | |
492 | [LQ_HT_SISO] = "HT SISO", | |
493 | [LQ_HT_MIMO2] = "HT MIMO", | |
494 | [LQ_VHT_SISO] = "VHT SISO", | |
495 | [LQ_VHT_MIMO2] = "VHT MIMO", | |
496 | }; | |
497 | ||
498 | if (type < LQ_NONE || type >= LQ_MAX) | |
499 | return "UNKNOWN"; | |
500 | ||
501 | return lq_types[type]; | |
502 | } | |
503 | ||
504 | static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, | |
505 | const char *prefix) | |
506 | { | |
507 | IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n", | |
508 | prefix, rs_pretty_lq_type(rate->type), | |
509 | rate->index, rs_pretty_ant(rate->ant), | |
510 | rate->bw, rate->sgi); | |
511 | } | |
512 | ||
513 | static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) | |
514 | { | |
515 | window->data = 0; | |
516 | window->success_counter = 0; | |
517 | window->success_ratio = IWL_INVALID_VALUE; | |
518 | window->counter = 0; | |
519 | window->average_tpt = IWL_INVALID_VALUE; | |
520 | } | |
521 | ||
522 | static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, | |
523 | struct iwl_scale_tbl_info *tbl) | |
524 | { | |
525 | int i; | |
526 | ||
527 | IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); | |
528 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
529 | rs_rate_scale_clear_window(&tbl->win[i]); | |
530 | ||
531 | for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) | |
532 | rs_rate_scale_clear_window(&tbl->tpc_win[i]); | |
533 | } | |
534 | ||
535 | static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) | |
536 | { | |
537 | return (ant_type & valid_antenna) == ant_type; | |
538 | } | |
539 | ||
540 | static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, | |
541 | struct iwl_lq_sta *lq_data, u8 tid, | |
542 | struct ieee80211_sta *sta) | |
543 | { | |
544 | int ret = -EAGAIN; | |
545 | ||
546 | IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", | |
547 | sta->addr, tid); | |
548 | ret = ieee80211_start_tx_ba_session(sta, tid, 5000); | |
549 | if (ret == -EAGAIN) { | |
550 | /* | |
551 | * driver and mac80211 is out of sync | |
552 | * this might be cause by reloading firmware | |
553 | * stop the tx ba session here | |
554 | */ | |
555 | IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", | |
556 | tid); | |
557 | ieee80211_stop_tx_ba_session(sta, tid); | |
558 | } | |
559 | return ret; | |
560 | } | |
561 | ||
562 | static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, | |
563 | struct iwl_lq_sta *lq_data, | |
564 | struct ieee80211_sta *sta) | |
565 | { | |
566 | if (tid < IWL_MAX_TID_COUNT) | |
567 | rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); | |
568 | else | |
569 | IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", | |
570 | tid, IWL_MAX_TID_COUNT); | |
571 | } | |
572 | ||
573 | static inline int get_num_of_ant_from_rate(u32 rate_n_flags) | |
574 | { | |
575 | return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + | |
576 | !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + | |
577 | !!(rate_n_flags & RATE_MCS_ANT_C_MSK); | |
578 | } | |
579 | ||
580 | /* | |
581 | * Static function to get the expected throughput from an iwl_scale_tbl_info | |
582 | * that wraps a NULL pointer check | |
583 | */ | |
584 | static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) | |
585 | { | |
586 | if (tbl->expected_tpt) | |
587 | return tbl->expected_tpt[rs_index]; | |
588 | return 0; | |
589 | } | |
590 | ||
591 | /** | |
592 | * rs_collect_tx_data - Update the success/failure sliding window | |
593 | * | |
594 | * We keep a sliding window of the last 62 packets transmitted | |
595 | * at this rate. window->data contains the bitmask of successful | |
596 | * packets. | |
597 | */ | |
598 | static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl, | |
599 | int scale_index, int attempts, int successes, | |
600 | struct iwl_rate_scale_data *window) | |
601 | { | |
602 | static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); | |
603 | s32 fail_count, tpt; | |
604 | ||
605 | /* Get expected throughput */ | |
606 | tpt = get_expected_tpt(tbl, scale_index); | |
607 | ||
608 | /* | |
609 | * Keep track of only the latest 62 tx frame attempts in this rate's | |
610 | * history window; anything older isn't really relevant any more. | |
611 | * If we have filled up the sliding window, drop the oldest attempt; | |
612 | * if the oldest attempt (highest bit in bitmap) shows "success", | |
613 | * subtract "1" from the success counter (this is the main reason | |
614 | * we keep these bitmaps!). | |
615 | */ | |
616 | while (attempts > 0) { | |
617 | if (window->counter >= IWL_RATE_MAX_WINDOW) { | |
618 | /* remove earliest */ | |
619 | window->counter = IWL_RATE_MAX_WINDOW - 1; | |
620 | ||
621 | if (window->data & mask) { | |
622 | window->data &= ~mask; | |
623 | window->success_counter--; | |
624 | } | |
625 | } | |
626 | ||
627 | /* Increment frames-attempted counter */ | |
628 | window->counter++; | |
629 | ||
630 | /* Shift bitmap by one frame to throw away oldest history */ | |
631 | window->data <<= 1; | |
632 | ||
633 | /* Mark the most recent #successes attempts as successful */ | |
634 | if (successes > 0) { | |
635 | window->success_counter++; | |
636 | window->data |= 0x1; | |
637 | successes--; | |
638 | } | |
639 | ||
640 | attempts--; | |
641 | } | |
642 | ||
643 | /* Calculate current success ratio, avoid divide-by-0! */ | |
644 | if (window->counter > 0) | |
645 | window->success_ratio = 128 * (100 * window->success_counter) | |
646 | / window->counter; | |
647 | else | |
648 | window->success_ratio = IWL_INVALID_VALUE; | |
649 | ||
650 | fail_count = window->counter - window->success_counter; | |
651 | ||
652 | /* Calculate average throughput, if we have enough history. */ | |
653 | if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || | |
654 | (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) | |
655 | window->average_tpt = (window->success_ratio * tpt + 64) / 128; | |
656 | else | |
657 | window->average_tpt = IWL_INVALID_VALUE; | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
662 | static int rs_collect_tx_data(struct iwl_lq_sta *lq_sta, | |
663 | struct iwl_scale_tbl_info *tbl, | |
664 | int scale_index, int attempts, int successes, | |
665 | u8 reduced_txp) | |
666 | { | |
667 | struct iwl_rate_scale_data *window = NULL; | |
668 | int ret; | |
669 | ||
670 | if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) | |
671 | return -EINVAL; | |
672 | ||
673 | if (tbl->column != RS_COLUMN_INVALID) { | |
674 | lq_sta->tx_stats[tbl->column][scale_index].total += attempts; | |
675 | lq_sta->tx_stats[tbl->column][scale_index].success += successes; | |
676 | } | |
677 | ||
678 | /* Select window for current tx bit rate */ | |
679 | window = &(tbl->win[scale_index]); | |
680 | ||
681 | ret = _rs_collect_tx_data(tbl, scale_index, attempts, successes, | |
682 | window); | |
683 | if (ret) | |
684 | return ret; | |
685 | ||
686 | if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) | |
687 | return -EINVAL; | |
688 | ||
689 | window = &tbl->tpc_win[reduced_txp]; | |
690 | return _rs_collect_tx_data(tbl, scale_index, attempts, successes, | |
691 | window); | |
692 | } | |
693 | ||
694 | /* Convert rs_rate object into ucode rate bitmask */ | |
695 | static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, | |
696 | struct rs_rate *rate) | |
697 | { | |
698 | u32 ucode_rate = 0; | |
699 | int index = rate->index; | |
700 | ||
701 | ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & | |
702 | RATE_MCS_ANT_ABC_MSK); | |
703 | ||
704 | if (is_legacy(rate)) { | |
705 | ucode_rate |= iwl_rates[index].plcp; | |
706 | if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) | |
707 | ucode_rate |= RATE_MCS_CCK_MSK; | |
708 | return ucode_rate; | |
709 | } | |
710 | ||
711 | if (is_ht(rate)) { | |
712 | if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { | |
713 | IWL_ERR(mvm, "Invalid HT rate index %d\n", index); | |
714 | index = IWL_LAST_HT_RATE; | |
715 | } | |
716 | ucode_rate |= RATE_MCS_HT_MSK; | |
717 | ||
718 | if (is_ht_siso(rate)) | |
719 | ucode_rate |= iwl_rates[index].plcp_ht_siso; | |
720 | else if (is_ht_mimo2(rate)) | |
721 | ucode_rate |= iwl_rates[index].plcp_ht_mimo2; | |
722 | else | |
723 | WARN_ON_ONCE(1); | |
724 | } else if (is_vht(rate)) { | |
725 | if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { | |
726 | IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); | |
727 | index = IWL_LAST_VHT_RATE; | |
728 | } | |
729 | ucode_rate |= RATE_MCS_VHT_MSK; | |
730 | if (is_vht_siso(rate)) | |
731 | ucode_rate |= iwl_rates[index].plcp_vht_siso; | |
732 | else if (is_vht_mimo2(rate)) | |
733 | ucode_rate |= iwl_rates[index].plcp_vht_mimo2; | |
734 | else | |
735 | WARN_ON_ONCE(1); | |
736 | ||
737 | } else { | |
738 | IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); | |
739 | } | |
740 | ||
741 | ucode_rate |= rate->bw; | |
742 | if (rate->sgi) | |
743 | ucode_rate |= RATE_MCS_SGI_MSK; | |
744 | ||
745 | return ucode_rate; | |
746 | } | |
747 | ||
748 | /* Convert a ucode rate into an rs_rate object */ | |
749 | static int rs_rate_from_ucode_rate(const u32 ucode_rate, | |
750 | enum ieee80211_band band, | |
751 | struct rs_rate *rate) | |
752 | { | |
753 | u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; | |
754 | u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); | |
755 | u8 nss; | |
756 | ||
757 | memset(rate, 0, sizeof(*rate)); | |
758 | rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); | |
759 | ||
760 | if (rate->index == IWL_RATE_INVALID) | |
761 | return -EINVAL; | |
762 | ||
763 | rate->ant = (ant_msk >> RATE_MCS_ANT_POS); | |
764 | ||
765 | /* Legacy */ | |
766 | if (!(ucode_rate & RATE_MCS_HT_MSK) && | |
767 | !(ucode_rate & RATE_MCS_VHT_MSK)) { | |
768 | if (num_of_ant == 1) { | |
769 | if (band == IEEE80211_BAND_5GHZ) | |
770 | rate->type = LQ_LEGACY_A; | |
771 | else | |
772 | rate->type = LQ_LEGACY_G; | |
773 | } | |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
778 | /* HT or VHT */ | |
779 | if (ucode_rate & RATE_MCS_SGI_MSK) | |
780 | rate->sgi = true; | |
781 | ||
782 | rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; | |
783 | ||
784 | if (ucode_rate & RATE_MCS_HT_MSK) { | |
785 | nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> | |
786 | RATE_HT_MCS_NSS_POS) + 1; | |
787 | ||
788 | if (nss == 1) { | |
789 | rate->type = LQ_HT_SISO; | |
790 | WARN_ON_ONCE(num_of_ant != 1); | |
791 | } else if (nss == 2) { | |
792 | rate->type = LQ_HT_MIMO2; | |
793 | WARN_ON_ONCE(num_of_ant != 2); | |
794 | } else { | |
795 | WARN_ON_ONCE(1); | |
796 | } | |
797 | } else if (ucode_rate & RATE_MCS_VHT_MSK) { | |
798 | nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> | |
799 | RATE_VHT_MCS_NSS_POS) + 1; | |
800 | ||
801 | if (nss == 1) { | |
802 | rate->type = LQ_VHT_SISO; | |
803 | WARN_ON_ONCE(num_of_ant != 1); | |
804 | } else if (nss == 2) { | |
805 | rate->type = LQ_VHT_MIMO2; | |
806 | WARN_ON_ONCE(num_of_ant != 2); | |
807 | } else { | |
808 | WARN_ON_ONCE(1); | |
809 | } | |
810 | } | |
811 | ||
812 | WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160); | |
813 | WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && | |
814 | !is_vht(rate)); | |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
819 | /* switch to another antenna/antennas and return 1 */ | |
820 | /* if no other valid antenna found, return 0 */ | |
821 | static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) | |
822 | { | |
823 | u8 new_ant_type; | |
824 | ||
825 | if (!rate->ant || rate->ant > ANT_ABC) | |
826 | return 0; | |
827 | ||
828 | if (!rs_is_valid_ant(valid_ant, rate->ant)) | |
829 | return 0; | |
830 | ||
831 | new_ant_type = ant_toggle_lookup[rate->ant]; | |
832 | ||
833 | while ((new_ant_type != rate->ant) && | |
834 | !rs_is_valid_ant(valid_ant, new_ant_type)) | |
835 | new_ant_type = ant_toggle_lookup[new_ant_type]; | |
836 | ||
837 | if (new_ant_type == rate->ant) | |
838 | return 0; | |
839 | ||
840 | rate->ant = new_ant_type; | |
841 | ||
842 | return 1; | |
843 | } | |
844 | ||
845 | static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, | |
846 | struct rs_rate *rate) | |
847 | { | |
848 | if (is_legacy(rate)) | |
849 | return lq_sta->active_legacy_rate; | |
850 | else if (is_siso(rate)) | |
851 | return lq_sta->active_siso_rate; | |
852 | else if (is_mimo2(rate)) | |
853 | return lq_sta->active_mimo2_rate; | |
854 | ||
855 | WARN_ON_ONCE(1); | |
856 | return 0; | |
857 | } | |
858 | ||
859 | static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, | |
860 | int rate_type) | |
861 | { | |
862 | u8 high = IWL_RATE_INVALID; | |
863 | u8 low = IWL_RATE_INVALID; | |
864 | ||
865 | /* 802.11A or ht walks to the next literal adjacent rate in | |
866 | * the rate table */ | |
867 | if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { | |
868 | int i; | |
869 | u32 mask; | |
870 | ||
871 | /* Find the previous rate that is in the rate mask */ | |
872 | i = index - 1; | |
873 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
874 | if (rate_mask & mask) { | |
875 | low = i; | |
876 | break; | |
877 | } | |
878 | } | |
879 | ||
880 | /* Find the next rate that is in the rate mask */ | |
881 | i = index + 1; | |
882 | for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { | |
883 | if (rate_mask & mask) { | |
884 | high = i; | |
885 | break; | |
886 | } | |
887 | } | |
888 | ||
889 | return (high << 8) | low; | |
890 | } | |
891 | ||
892 | low = index; | |
893 | while (low != IWL_RATE_INVALID) { | |
894 | low = iwl_rates[low].prev_rs; | |
895 | if (low == IWL_RATE_INVALID) | |
896 | break; | |
897 | if (rate_mask & (1 << low)) | |
898 | break; | |
899 | IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low); | |
900 | } | |
901 | ||
902 | high = index; | |
903 | while (high != IWL_RATE_INVALID) { | |
904 | high = iwl_rates[high].next_rs; | |
905 | if (high == IWL_RATE_INVALID) | |
906 | break; | |
907 | if (rate_mask & (1 << high)) | |
908 | break; | |
909 | IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high); | |
910 | } | |
911 | ||
912 | return (high << 8) | low; | |
913 | } | |
914 | ||
915 | static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, | |
916 | struct rs_rate *rate) | |
917 | { | |
918 | return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); | |
919 | } | |
920 | ||
921 | /* Get the next supported lower rate in the current column. | |
922 | * Return true if bottom rate in the current column was reached | |
923 | */ | |
924 | static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, | |
925 | struct rs_rate *rate) | |
926 | { | |
927 | u8 low; | |
928 | u16 high_low; | |
929 | u16 rate_mask; | |
930 | struct iwl_mvm *mvm = lq_sta->drv; | |
931 | ||
932 | rate_mask = rs_get_supported_rates(lq_sta, rate); | |
933 | high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, | |
934 | rate->type); | |
935 | low = high_low & 0xff; | |
936 | ||
937 | /* Bottom rate of column reached */ | |
938 | if (low == IWL_RATE_INVALID) | |
939 | return true; | |
940 | ||
941 | rate->index = low; | |
942 | return false; | |
943 | } | |
944 | ||
945 | /* Get the next rate to use following a column downgrade */ | |
946 | static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, | |
947 | struct rs_rate *rate) | |
948 | { | |
949 | struct iwl_mvm *mvm = lq_sta->drv; | |
950 | ||
951 | if (is_legacy(rate)) { | |
952 | /* No column to downgrade from Legacy */ | |
953 | return; | |
954 | } else if (is_siso(rate)) { | |
955 | /* Downgrade to Legacy if we were in SISO */ | |
956 | if (lq_sta->band == IEEE80211_BAND_5GHZ) | |
957 | rate->type = LQ_LEGACY_A; | |
958 | else | |
959 | rate->type = LQ_LEGACY_G; | |
960 | ||
961 | rate->bw = RATE_MCS_CHAN_WIDTH_20; | |
962 | ||
963 | WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || | |
964 | rate->index > IWL_RATE_MCS_9_INDEX); | |
965 | ||
966 | rate->index = rs_ht_to_legacy[rate->index]; | |
967 | } else { | |
968 | /* Downgrade to SISO with same MCS if in MIMO */ | |
969 | rate->type = is_vht_mimo2(rate) ? | |
970 | LQ_VHT_SISO : LQ_HT_SISO; | |
971 | } | |
972 | ||
973 | ||
974 | if (num_of_ant(rate->ant) > 1) | |
975 | rate->ant = first_antenna(mvm->fw->valid_tx_ant); | |
976 | ||
977 | /* Relevant in both switching to SISO or Legacy */ | |
978 | rate->sgi = false; | |
979 | ||
980 | if (!rs_rate_supported(lq_sta, rate)) | |
981 | rs_get_lower_rate_in_column(lq_sta, rate); | |
982 | } | |
983 | ||
984 | /* Simple function to compare two rate scale table types */ | |
985 | static inline bool rs_rate_match(struct rs_rate *a, | |
986 | struct rs_rate *b) | |
987 | { | |
988 | return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi); | |
989 | } | |
990 | ||
991 | static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags) | |
992 | { | |
993 | if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH) | |
994 | return RATE_MCS_CHAN_WIDTH_40; | |
995 | else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH) | |
996 | return RATE_MCS_CHAN_WIDTH_80; | |
997 | else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH) | |
998 | return RATE_MCS_CHAN_WIDTH_160; | |
999 | ||
1000 | return RATE_MCS_CHAN_WIDTH_20; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * mac80211 sends us Tx status | |
1005 | */ | |
1006 | static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband, | |
1007 | struct ieee80211_sta *sta, void *priv_sta, | |
1008 | struct sk_buff *skb) | |
1009 | { | |
1010 | int legacy_success; | |
1011 | int retries; | |
1012 | int mac_index, i; | |
1013 | struct iwl_lq_sta *lq_sta = priv_sta; | |
1014 | struct iwl_lq_cmd *table; | |
1015 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1016 | struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; | |
1017 | struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); | |
1018 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1019 | enum mac80211_rate_control_flags mac_flags; | |
1020 | u32 ucode_rate; | |
1021 | struct rs_rate rate; | |
1022 | struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; | |
1023 | u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0]; | |
1024 | ||
1025 | /* Treat uninitialized rate scaling data same as non-existing. */ | |
1026 | if (!lq_sta) { | |
1027 | IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); | |
1028 | return; | |
1029 | } else if (!lq_sta->drv) { | |
1030 | IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); | |
1031 | return; | |
1032 | } | |
1033 | ||
1034 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1035 | /* Disable last tx check if we are debugging with fixed rate */ | |
1036 | if (lq_sta->dbg_fixed_rate) { | |
1037 | IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n"); | |
1038 | return; | |
1039 | } | |
1040 | #endif | |
1041 | if (!ieee80211_is_data(hdr->frame_control) || | |
1042 | info->flags & IEEE80211_TX_CTL_NO_ACK) | |
1043 | return; | |
1044 | ||
1045 | /* This packet was aggregated but doesn't carry status info */ | |
1046 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
1047 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
1048 | return; | |
1049 | ||
1050 | /* | |
1051 | * Ignore this Tx frame response if its initial rate doesn't match | |
1052 | * that of latest Link Quality command. There may be stragglers | |
1053 | * from a previous Link Quality command, but we're no longer interested | |
1054 | * in those; they're either from the "active" mode while we're trying | |
1055 | * to check "search" mode, or a prior "search" mode after we've moved | |
1056 | * to a new "search" mode (which might become the new "active" mode). | |
1057 | */ | |
1058 | table = &lq_sta->lq; | |
1059 | ucode_rate = le32_to_cpu(table->rs_table[0]); | |
1060 | rs_rate_from_ucode_rate(ucode_rate, info->band, &rate); | |
1061 | if (info->band == IEEE80211_BAND_5GHZ) | |
1062 | rate.index -= IWL_FIRST_OFDM_RATE; | |
1063 | mac_flags = info->status.rates[0].flags; | |
1064 | mac_index = info->status.rates[0].idx; | |
1065 | /* For HT packets, map MCS to PLCP */ | |
1066 | if (mac_flags & IEEE80211_TX_RC_MCS) { | |
1067 | /* Remove # of streams */ | |
1068 | mac_index &= RATE_HT_MCS_RATE_CODE_MSK; | |
1069 | if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE)) | |
1070 | mac_index++; | |
1071 | /* | |
1072 | * mac80211 HT index is always zero-indexed; we need to move | |
1073 | * HT OFDM rates after CCK rates in 2.4 GHz band | |
1074 | */ | |
1075 | if (info->band == IEEE80211_BAND_2GHZ) | |
1076 | mac_index += IWL_FIRST_OFDM_RATE; | |
1077 | } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) { | |
1078 | mac_index &= RATE_VHT_MCS_RATE_CODE_MSK; | |
1079 | if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE)) | |
1080 | mac_index++; | |
1081 | } | |
1082 | ||
1083 | if (time_after(jiffies, | |
1084 | (unsigned long)(lq_sta->last_tx + RS_IDLE_TIMEOUT))) { | |
1085 | int tid; | |
1086 | IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); | |
1087 | for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) | |
1088 | ieee80211_stop_tx_ba_session(sta, tid); | |
1089 | ||
1090 | iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); | |
1091 | return; | |
1092 | } | |
1093 | lq_sta->last_tx = jiffies; | |
1094 | ||
1095 | /* Here we actually compare this rate to the latest LQ command */ | |
1096 | if ((mac_index < 0) || | |
1097 | (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) || | |
1098 | (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) || | |
1099 | (rate.ant != info->status.antenna) || | |
1100 | (!!(ucode_rate & RATE_MCS_HT_MSK) != | |
1101 | !!(mac_flags & IEEE80211_TX_RC_MCS)) || | |
1102 | (!!(ucode_rate & RATE_MCS_VHT_MSK) != | |
1103 | !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) || | |
1104 | (!!(ucode_rate & RATE_HT_MCS_GF_MSK) != | |
1105 | !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) || | |
1106 | (rate.index != mac_index)) { | |
1107 | IWL_DEBUG_RATE(mvm, | |
1108 | "initial rate %d does not match %d (0x%x)\n", | |
1109 | mac_index, rate.index, ucode_rate); | |
1110 | /* | |
1111 | * Since rates mis-match, the last LQ command may have failed. | |
1112 | * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with | |
1113 | * ... driver. | |
1114 | */ | |
1115 | lq_sta->missed_rate_counter++; | |
1116 | if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) { | |
1117 | lq_sta->missed_rate_counter = 0; | |
1118 | IWL_DEBUG_RATE(mvm, | |
1119 | "Too many rates mismatch. Send sync LQ. rs_state %d\n", | |
1120 | lq_sta->rs_state); | |
1121 | iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); | |
1122 | } | |
1123 | /* Regardless, ignore this status info for outdated rate */ | |
1124 | return; | |
1125 | } else | |
1126 | /* Rate did match, so reset the missed_rate_counter */ | |
1127 | lq_sta->missed_rate_counter = 0; | |
1128 | ||
1129 | /* Figure out if rate scale algorithm is in active or search table */ | |
1130 | if (rs_rate_match(&rate, | |
1131 | &(lq_sta->lq_info[lq_sta->active_tbl].rate))) { | |
1132 | curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
1133 | other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); | |
1134 | } else if (rs_rate_match(&rate, | |
1135 | &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) { | |
1136 | curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); | |
1137 | other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
1138 | } else { | |
1139 | IWL_DEBUG_RATE(mvm, | |
1140 | "Neither active nor search matches tx rate\n"); | |
1141 | tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
1142 | rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); | |
1143 | tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); | |
1144 | rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); | |
1145 | rs_dump_rate(mvm, &rate, "ACTUAL"); | |
1146 | ||
1147 | /* | |
1148 | * no matching table found, let's by-pass the data collection | |
1149 | * and continue to perform rate scale to find the rate table | |
1150 | */ | |
1151 | rs_stay_in_table(lq_sta, true); | |
1152 | goto done; | |
1153 | } | |
1154 | ||
1155 | /* | |
1156 | * Updating the frame history depends on whether packets were | |
1157 | * aggregated. | |
1158 | * | |
1159 | * For aggregation, all packets were transmitted at the same rate, the | |
1160 | * first index into rate scale table. | |
1161 | */ | |
1162 | if (info->flags & IEEE80211_TX_STAT_AMPDU) { | |
1163 | ucode_rate = le32_to_cpu(table->rs_table[0]); | |
1164 | rs_rate_from_ucode_rate(ucode_rate, info->band, &rate); | |
1165 | rs_collect_tx_data(lq_sta, curr_tbl, rate.index, | |
1166 | info->status.ampdu_len, | |
1167 | info->status.ampdu_ack_len, | |
1168 | reduced_txp); | |
1169 | ||
1170 | /* Update success/fail counts if not searching for new mode */ | |
1171 | if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { | |
1172 | lq_sta->total_success += info->status.ampdu_ack_len; | |
1173 | lq_sta->total_failed += (info->status.ampdu_len - | |
1174 | info->status.ampdu_ack_len); | |
1175 | } | |
1176 | } else { | |
1177 | /* | |
1178 | * For legacy, update frame history with for each Tx retry. | |
1179 | */ | |
1180 | retries = info->status.rates[0].count - 1; | |
1181 | /* HW doesn't send more than 15 retries */ | |
1182 | retries = min(retries, 15); | |
1183 | ||
1184 | /* The last transmission may have been successful */ | |
1185 | legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); | |
1186 | /* Collect data for each rate used during failed TX attempts */ | |
1187 | for (i = 0; i <= retries; ++i) { | |
1188 | ucode_rate = le32_to_cpu(table->rs_table[i]); | |
1189 | rs_rate_from_ucode_rate(ucode_rate, info->band, &rate); | |
1190 | /* | |
1191 | * Only collect stats if retried rate is in the same RS | |
1192 | * table as active/search. | |
1193 | */ | |
1194 | if (rs_rate_match(&rate, &curr_tbl->rate)) | |
1195 | tmp_tbl = curr_tbl; | |
1196 | else if (rs_rate_match(&rate, &other_tbl->rate)) | |
1197 | tmp_tbl = other_tbl; | |
1198 | else | |
1199 | continue; | |
1200 | ||
1201 | rs_collect_tx_data(lq_sta, tmp_tbl, rate.index, 1, | |
1202 | i < retries ? 0 : legacy_success, | |
1203 | reduced_txp); | |
1204 | } | |
1205 | ||
1206 | /* Update success/fail counts if not searching for new mode */ | |
1207 | if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { | |
1208 | lq_sta->total_success += legacy_success; | |
1209 | lq_sta->total_failed += retries + (1 - legacy_success); | |
1210 | } | |
1211 | } | |
1212 | /* The last TX rate is cached in lq_sta; it's set in if/else above */ | |
1213 | lq_sta->last_rate_n_flags = ucode_rate; | |
1214 | IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); | |
1215 | done: | |
1216 | /* See if there's a better rate or modulation mode to try. */ | |
1217 | if (sta && sta->supp_rates[sband->band]) | |
1218 | rs_rate_scale_perform(mvm, skb, sta, lq_sta); | |
1219 | } | |
1220 | ||
1221 | /* | |
1222 | * Begin a period of staying with a selected modulation mode. | |
1223 | * Set "stay_in_tbl" flag to prevent any mode switches. | |
1224 | * Set frame tx success limits according to legacy vs. high-throughput, | |
1225 | * and reset overall (spanning all rates) tx success history statistics. | |
1226 | * These control how long we stay using same modulation mode before | |
1227 | * searching for a new mode. | |
1228 | */ | |
1229 | static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, | |
1230 | struct iwl_lq_sta *lq_sta) | |
1231 | { | |
1232 | IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); | |
1233 | lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; | |
1234 | if (is_legacy) { | |
1235 | lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; | |
1236 | lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; | |
1237 | lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; | |
1238 | } else { | |
1239 | lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; | |
1240 | lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; | |
1241 | lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; | |
1242 | } | |
1243 | lq_sta->table_count = 0; | |
1244 | lq_sta->total_failed = 0; | |
1245 | lq_sta->total_success = 0; | |
1246 | lq_sta->flush_timer = jiffies; | |
1247 | lq_sta->visited_columns = 0; | |
1248 | } | |
1249 | ||
1250 | static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, | |
1251 | const struct rs_tx_column *column) | |
1252 | { | |
1253 | switch (column->mode) { | |
1254 | case RS_LEGACY: | |
1255 | return lq_sta->max_legacy_rate_idx; | |
1256 | case RS_SISO: | |
1257 | return lq_sta->max_siso_rate_idx; | |
1258 | case RS_MIMO2: | |
1259 | return lq_sta->max_mimo2_rate_idx; | |
1260 | default: | |
1261 | WARN_ON_ONCE(1); | |
1262 | } | |
1263 | ||
1264 | return lq_sta->max_legacy_rate_idx; | |
1265 | } | |
1266 | ||
1267 | static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, | |
1268 | const struct rs_tx_column *column, | |
1269 | u32 bw) | |
1270 | { | |
1271 | /* Used to choose among HT tables */ | |
1272 | const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; | |
1273 | ||
1274 | if (WARN_ON_ONCE(column->mode != RS_LEGACY && | |
1275 | column->mode != RS_SISO && | |
1276 | column->mode != RS_MIMO2)) | |
1277 | return expected_tpt_legacy; | |
1278 | ||
1279 | /* Legacy rates have only one table */ | |
1280 | if (column->mode == RS_LEGACY) | |
1281 | return expected_tpt_legacy; | |
1282 | ||
1283 | ht_tbl_pointer = expected_tpt_mimo2_20MHz; | |
1284 | /* Choose among many HT tables depending on number of streams | |
1285 | * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation | |
1286 | * status */ | |
1287 | if (column->mode == RS_SISO) { | |
1288 | switch (bw) { | |
1289 | case RATE_MCS_CHAN_WIDTH_20: | |
1290 | ht_tbl_pointer = expected_tpt_siso_20MHz; | |
1291 | break; | |
1292 | case RATE_MCS_CHAN_WIDTH_40: | |
1293 | ht_tbl_pointer = expected_tpt_siso_40MHz; | |
1294 | break; | |
1295 | case RATE_MCS_CHAN_WIDTH_80: | |
1296 | ht_tbl_pointer = expected_tpt_siso_80MHz; | |
1297 | break; | |
1298 | default: | |
1299 | WARN_ON_ONCE(1); | |
1300 | } | |
1301 | } else if (column->mode == RS_MIMO2) { | |
1302 | switch (bw) { | |
1303 | case RATE_MCS_CHAN_WIDTH_20: | |
1304 | ht_tbl_pointer = expected_tpt_mimo2_20MHz; | |
1305 | break; | |
1306 | case RATE_MCS_CHAN_WIDTH_40: | |
1307 | ht_tbl_pointer = expected_tpt_mimo2_40MHz; | |
1308 | break; | |
1309 | case RATE_MCS_CHAN_WIDTH_80: | |
1310 | ht_tbl_pointer = expected_tpt_mimo2_80MHz; | |
1311 | break; | |
1312 | default: | |
1313 | WARN_ON_ONCE(1); | |
1314 | } | |
1315 | } else { | |
1316 | WARN_ON_ONCE(1); | |
1317 | } | |
1318 | ||
1319 | if (!column->sgi && !lq_sta->is_agg) /* Normal */ | |
1320 | return ht_tbl_pointer[0]; | |
1321 | else if (column->sgi && !lq_sta->is_agg) /* SGI */ | |
1322 | return ht_tbl_pointer[1]; | |
1323 | else if (!column->sgi && lq_sta->is_agg) /* AGG */ | |
1324 | return ht_tbl_pointer[2]; | |
1325 | else /* AGG+SGI */ | |
1326 | return ht_tbl_pointer[3]; | |
1327 | } | |
1328 | ||
1329 | static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, | |
1330 | struct iwl_scale_tbl_info *tbl) | |
1331 | { | |
1332 | struct rs_rate *rate = &tbl->rate; | |
1333 | const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; | |
1334 | ||
1335 | tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * Find starting rate for new "search" high-throughput mode of modulation. | |
1340 | * Goal is to find lowest expected rate (under perfect conditions) that is | |
1341 | * above the current measured throughput of "active" mode, to give new mode | |
1342 | * a fair chance to prove itself without too many challenges. | |
1343 | * | |
1344 | * This gets called when transitioning to more aggressive modulation | |
1345 | * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive | |
1346 | * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need | |
1347 | * to decrease to match "active" throughput. When moving from MIMO to SISO, | |
1348 | * bit rate will typically need to increase, but not if performance was bad. | |
1349 | */ | |
1350 | static s32 rs_get_best_rate(struct iwl_mvm *mvm, | |
1351 | struct iwl_lq_sta *lq_sta, | |
1352 | struct iwl_scale_tbl_info *tbl, /* "search" */ | |
1353 | u16 rate_mask, s8 index) | |
1354 | { | |
1355 | /* "active" values */ | |
1356 | struct iwl_scale_tbl_info *active_tbl = | |
1357 | &(lq_sta->lq_info[lq_sta->active_tbl]); | |
1358 | s32 active_sr = active_tbl->win[index].success_ratio; | |
1359 | s32 active_tpt = active_tbl->expected_tpt[index]; | |
1360 | /* expected "search" throughput */ | |
1361 | const u16 *tpt_tbl = tbl->expected_tpt; | |
1362 | ||
1363 | s32 new_rate, high, low, start_hi; | |
1364 | u16 high_low; | |
1365 | s8 rate = index; | |
1366 | ||
1367 | new_rate = high = low = start_hi = IWL_RATE_INVALID; | |
1368 | ||
1369 | while (1) { | |
1370 | high_low = rs_get_adjacent_rate(mvm, rate, rate_mask, | |
1371 | tbl->rate.type); | |
1372 | ||
1373 | low = high_low & 0xff; | |
1374 | high = (high_low >> 8) & 0xff; | |
1375 | ||
1376 | /* | |
1377 | * Lower the "search" bit rate, to give new "search" mode | |
1378 | * approximately the same throughput as "active" if: | |
1379 | * | |
1380 | * 1) "Active" mode has been working modestly well (but not | |
1381 | * great), and expected "search" throughput (under perfect | |
1382 | * conditions) at candidate rate is above the actual | |
1383 | * measured "active" throughput (but less than expected | |
1384 | * "active" throughput under perfect conditions). | |
1385 | * OR | |
1386 | * 2) "Active" mode has been working perfectly or very well | |
1387 | * and expected "search" throughput (under perfect | |
1388 | * conditions) at candidate rate is above expected | |
1389 | * "active" throughput (under perfect conditions). | |
1390 | */ | |
1391 | if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && | |
1392 | ((active_sr > RS_SR_FORCE_DECREASE) && | |
1393 | (active_sr <= IWL_RATE_HIGH_TH) && | |
1394 | (tpt_tbl[rate] <= active_tpt))) || | |
1395 | ((active_sr >= IWL_RATE_SCALE_SWITCH) && | |
1396 | (tpt_tbl[rate] > active_tpt))) { | |
1397 | /* (2nd or later pass) | |
1398 | * If we've already tried to raise the rate, and are | |
1399 | * now trying to lower it, use the higher rate. */ | |
1400 | if (start_hi != IWL_RATE_INVALID) { | |
1401 | new_rate = start_hi; | |
1402 | break; | |
1403 | } | |
1404 | ||
1405 | new_rate = rate; | |
1406 | ||
1407 | /* Loop again with lower rate */ | |
1408 | if (low != IWL_RATE_INVALID) | |
1409 | rate = low; | |
1410 | ||
1411 | /* Lower rate not available, use the original */ | |
1412 | else | |
1413 | break; | |
1414 | ||
1415 | /* Else try to raise the "search" rate to match "active" */ | |
1416 | } else { | |
1417 | /* (2nd or later pass) | |
1418 | * If we've already tried to lower the rate, and are | |
1419 | * now trying to raise it, use the lower rate. */ | |
1420 | if (new_rate != IWL_RATE_INVALID) | |
1421 | break; | |
1422 | ||
1423 | /* Loop again with higher rate */ | |
1424 | else if (high != IWL_RATE_INVALID) { | |
1425 | start_hi = high; | |
1426 | rate = high; | |
1427 | ||
1428 | /* Higher rate not available, use the original */ | |
1429 | } else { | |
1430 | new_rate = rate; | |
1431 | break; | |
1432 | } | |
1433 | } | |
1434 | } | |
1435 | ||
1436 | return new_rate; | |
1437 | } | |
1438 | ||
1439 | static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) | |
1440 | { | |
1441 | if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) | |
1442 | return RATE_MCS_CHAN_WIDTH_80; | |
1443 | else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) | |
1444 | return RATE_MCS_CHAN_WIDTH_40; | |
1445 | ||
1446 | return RATE_MCS_CHAN_WIDTH_20; | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * Check whether we should continue using same modulation mode, or | |
1451 | * begin search for a new mode, based on: | |
1452 | * 1) # tx successes or failures while using this mode | |
1453 | * 2) # times calling this function | |
1454 | * 3) elapsed time in this mode (not used, for now) | |
1455 | */ | |
1456 | static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) | |
1457 | { | |
1458 | struct iwl_scale_tbl_info *tbl; | |
1459 | int active_tbl; | |
1460 | int flush_interval_passed = 0; | |
1461 | struct iwl_mvm *mvm; | |
1462 | ||
1463 | mvm = lq_sta->drv; | |
1464 | active_tbl = lq_sta->active_tbl; | |
1465 | ||
1466 | tbl = &(lq_sta->lq_info[active_tbl]); | |
1467 | ||
1468 | /* If we've been disallowing search, see if we should now allow it */ | |
1469 | if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { | |
1470 | /* Elapsed time using current modulation mode */ | |
1471 | if (lq_sta->flush_timer) | |
1472 | flush_interval_passed = | |
1473 | time_after(jiffies, | |
1474 | (unsigned long)(lq_sta->flush_timer + | |
1475 | RS_STAY_IN_COLUMN_TIMEOUT)); | |
1476 | ||
1477 | /* | |
1478 | * Check if we should allow search for new modulation mode. | |
1479 | * If many frames have failed or succeeded, or we've used | |
1480 | * this same modulation for a long time, allow search, and | |
1481 | * reset history stats that keep track of whether we should | |
1482 | * allow a new search. Also (below) reset all bitmaps and | |
1483 | * stats in active history. | |
1484 | */ | |
1485 | if (force_search || | |
1486 | (lq_sta->total_failed > lq_sta->max_failure_limit) || | |
1487 | (lq_sta->total_success > lq_sta->max_success_limit) || | |
1488 | ((!lq_sta->search_better_tbl) && | |
1489 | (lq_sta->flush_timer) && (flush_interval_passed))) { | |
1490 | IWL_DEBUG_RATE(mvm, | |
1491 | "LQ: stay is expired %d %d %d\n", | |
1492 | lq_sta->total_failed, | |
1493 | lq_sta->total_success, | |
1494 | flush_interval_passed); | |
1495 | ||
1496 | /* Allow search for new mode */ | |
1497 | lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; | |
1498 | IWL_DEBUG_RATE(mvm, | |
1499 | "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); | |
1500 | lq_sta->total_failed = 0; | |
1501 | lq_sta->total_success = 0; | |
1502 | lq_sta->flush_timer = 0; | |
1503 | /* mark the current column as visited */ | |
1504 | lq_sta->visited_columns = BIT(tbl->column); | |
1505 | /* | |
1506 | * Else if we've used this modulation mode enough repetitions | |
1507 | * (regardless of elapsed time or success/failure), reset | |
1508 | * history bitmaps and rate-specific stats for all rates in | |
1509 | * active table. | |
1510 | */ | |
1511 | } else { | |
1512 | lq_sta->table_count++; | |
1513 | if (lq_sta->table_count >= | |
1514 | lq_sta->table_count_limit) { | |
1515 | lq_sta->table_count = 0; | |
1516 | ||
1517 | IWL_DEBUG_RATE(mvm, | |
1518 | "LQ: stay in table clear win\n"); | |
1519 | rs_rate_scale_clear_tbl_windows(mvm, tbl); | |
1520 | } | |
1521 | } | |
1522 | ||
1523 | /* If transitioning to allow "search", reset all history | |
1524 | * bitmaps and stats in active table (this will become the new | |
1525 | * "search" table). */ | |
1526 | if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { | |
1527 | rs_rate_scale_clear_tbl_windows(mvm, tbl); | |
1528 | } | |
1529 | } | |
1530 | } | |
1531 | ||
1532 | /* | |
1533 | * setup rate table in uCode | |
1534 | */ | |
1535 | static void rs_update_rate_tbl(struct iwl_mvm *mvm, | |
1536 | struct ieee80211_sta *sta, | |
1537 | struct iwl_lq_sta *lq_sta, | |
1538 | struct rs_rate *rate) | |
1539 | { | |
1540 | rs_fill_lq_cmd(mvm, sta, lq_sta, rate); | |
1541 | iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); | |
1542 | } | |
1543 | ||
1544 | static u8 rs_get_tid(struct iwl_lq_sta *lq_data, | |
1545 | struct ieee80211_hdr *hdr) | |
1546 | { | |
1547 | u8 tid = IWL_MAX_TID_COUNT; | |
1548 | ||
1549 | if (ieee80211_is_data_qos(hdr->frame_control)) { | |
1550 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
1551 | tid = qc[0] & 0xf; | |
1552 | } | |
1553 | ||
1554 | if (unlikely(tid > IWL_MAX_TID_COUNT)) | |
1555 | tid = IWL_MAX_TID_COUNT; | |
1556 | ||
1557 | return tid; | |
1558 | } | |
1559 | ||
1560 | static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, | |
1561 | struct iwl_lq_sta *lq_sta, | |
1562 | struct ieee80211_sta *sta, | |
1563 | struct iwl_scale_tbl_info *tbl) | |
1564 | { | |
1565 | int i, j, max_rate; | |
1566 | enum rs_column next_col_id; | |
1567 | const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; | |
1568 | const struct rs_tx_column *next_col; | |
1569 | allow_column_func_t allow_func; | |
1570 | u8 valid_ants = mvm->fw->valid_tx_ant; | |
1571 | const u16 *expected_tpt_tbl; | |
1572 | u16 tpt, max_expected_tpt; | |
1573 | ||
1574 | for (i = 0; i < MAX_NEXT_COLUMNS; i++) { | |
1575 | next_col_id = curr_col->next_columns[i]; | |
1576 | ||
1577 | if (next_col_id == RS_COLUMN_INVALID) | |
1578 | continue; | |
1579 | ||
1580 | if (lq_sta->visited_columns & BIT(next_col_id)) { | |
1581 | IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", | |
1582 | next_col_id); | |
1583 | continue; | |
1584 | } | |
1585 | ||
1586 | next_col = &rs_tx_columns[next_col_id]; | |
1587 | ||
1588 | if (!rs_is_valid_ant(valid_ants, next_col->ant)) { | |
1589 | IWL_DEBUG_RATE(mvm, | |
1590 | "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", | |
1591 | next_col_id, valid_ants, next_col->ant); | |
1592 | continue; | |
1593 | } | |
1594 | ||
1595 | for (j = 0; j < MAX_COLUMN_CHECKS; j++) { | |
1596 | allow_func = next_col->checks[j]; | |
1597 | if (allow_func && !allow_func(mvm, sta, tbl)) | |
1598 | break; | |
1599 | } | |
1600 | ||
1601 | if (j != MAX_COLUMN_CHECKS) { | |
1602 | IWL_DEBUG_RATE(mvm, | |
1603 | "Skip column %d: not allowed (check %d failed)\n", | |
1604 | next_col_id, j); | |
1605 | ||
1606 | continue; | |
1607 | } | |
1608 | ||
1609 | tpt = lq_sta->last_tpt / 100; | |
1610 | expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, | |
1611 | tbl->rate.bw); | |
1612 | if (WARN_ON_ONCE(!expected_tpt_tbl)) | |
1613 | continue; | |
1614 | ||
1615 | max_rate = rs_get_max_allowed_rate(lq_sta, next_col); | |
1616 | if (WARN_ON_ONCE(max_rate == IWL_RATE_INVALID)) | |
1617 | continue; | |
1618 | ||
1619 | max_expected_tpt = expected_tpt_tbl[max_rate]; | |
1620 | if (tpt >= max_expected_tpt) { | |
1621 | IWL_DEBUG_RATE(mvm, | |
1622 | "Skip column %d: can't beat current TPT. Max expected %d current %d\n", | |
1623 | next_col_id, max_expected_tpt, tpt); | |
1624 | continue; | |
1625 | } | |
1626 | ||
1627 | IWL_DEBUG_RATE(mvm, | |
1628 | "Found potential column %d. Max expected %d current %d\n", | |
1629 | next_col_id, max_expected_tpt, tpt); | |
1630 | break; | |
1631 | } | |
1632 | ||
1633 | if (i == MAX_NEXT_COLUMNS) | |
1634 | return RS_COLUMN_INVALID; | |
1635 | ||
1636 | return next_col_id; | |
1637 | } | |
1638 | ||
1639 | static int rs_switch_to_column(struct iwl_mvm *mvm, | |
1640 | struct iwl_lq_sta *lq_sta, | |
1641 | struct ieee80211_sta *sta, | |
1642 | enum rs_column col_id) | |
1643 | { | |
1644 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
1645 | struct iwl_scale_tbl_info *search_tbl = | |
1646 | &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); | |
1647 | struct rs_rate *rate = &search_tbl->rate; | |
1648 | const struct rs_tx_column *column = &rs_tx_columns[col_id]; | |
1649 | const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; | |
1650 | u32 sz = (sizeof(struct iwl_scale_tbl_info) - | |
1651 | (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); | |
1652 | u16 rate_mask = 0; | |
1653 | u32 rate_idx = 0; | |
1654 | ||
1655 | memcpy(search_tbl, tbl, sz); | |
1656 | ||
1657 | rate->sgi = column->sgi; | |
1658 | rate->ant = column->ant; | |
1659 | ||
1660 | if (column->mode == RS_LEGACY) { | |
1661 | if (lq_sta->band == IEEE80211_BAND_5GHZ) | |
1662 | rate->type = LQ_LEGACY_A; | |
1663 | else | |
1664 | rate->type = LQ_LEGACY_G; | |
1665 | ||
1666 | rate_mask = lq_sta->active_legacy_rate; | |
1667 | } else if (column->mode == RS_SISO) { | |
1668 | rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; | |
1669 | rate_mask = lq_sta->active_siso_rate; | |
1670 | } else if (column->mode == RS_MIMO2) { | |
1671 | rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; | |
1672 | rate_mask = lq_sta->active_mimo2_rate; | |
1673 | } else { | |
1674 | WARN_ON_ONCE("Bad column mode"); | |
1675 | } | |
1676 | ||
1677 | rate->bw = rs_bw_from_sta_bw(sta); | |
1678 | search_tbl->column = col_id; | |
1679 | rs_set_expected_tpt_table(lq_sta, search_tbl); | |
1680 | ||
1681 | lq_sta->visited_columns |= BIT(col_id); | |
1682 | ||
1683 | /* Get the best matching rate if we're changing modes. e.g. | |
1684 | * SISO->MIMO, LEGACY->SISO, MIMO->SISO | |
1685 | */ | |
1686 | if (curr_column->mode != column->mode) { | |
1687 | rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, | |
1688 | rate_mask, rate->index); | |
1689 | ||
1690 | if ((rate_idx == IWL_RATE_INVALID) || | |
1691 | !(BIT(rate_idx) & rate_mask)) { | |
1692 | IWL_DEBUG_RATE(mvm, | |
1693 | "can not switch with index %d" | |
1694 | " rate mask %x\n", | |
1695 | rate_idx, rate_mask); | |
1696 | ||
1697 | goto err; | |
1698 | } | |
1699 | ||
1700 | rate->index = rate_idx; | |
1701 | } | |
1702 | ||
1703 | IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", | |
1704 | col_id, rate->index); | |
1705 | ||
1706 | return 0; | |
1707 | ||
1708 | err: | |
1709 | rate->type = LQ_NONE; | |
1710 | return -1; | |
1711 | } | |
1712 | ||
1713 | static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, | |
1714 | struct iwl_scale_tbl_info *tbl, | |
1715 | s32 sr, int low, int high, | |
1716 | int current_tpt, | |
1717 | int low_tpt, int high_tpt) | |
1718 | { | |
1719 | enum rs_action action = RS_ACTION_STAY; | |
1720 | ||
1721 | if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) { | |
1722 | IWL_DEBUG_RATE(mvm, | |
1723 | "Decrease rate because of low SR\n"); | |
1724 | return RS_ACTION_DOWNSCALE; | |
1725 | } | |
1726 | ||
1727 | if ((low_tpt == IWL_INVALID_VALUE) && | |
1728 | (high_tpt == IWL_INVALID_VALUE) && | |
1729 | (high != IWL_RATE_INVALID)) { | |
1730 | IWL_DEBUG_RATE(mvm, | |
1731 | "No data about high/low rates. Increase rate\n"); | |
1732 | return RS_ACTION_UPSCALE; | |
1733 | } | |
1734 | ||
1735 | if ((high_tpt == IWL_INVALID_VALUE) && | |
1736 | (high != IWL_RATE_INVALID) && | |
1737 | (low_tpt != IWL_INVALID_VALUE) && | |
1738 | (low_tpt < current_tpt)) { | |
1739 | IWL_DEBUG_RATE(mvm, | |
1740 | "No data about high rate and low rate is worse. Increase rate\n"); | |
1741 | return RS_ACTION_UPSCALE; | |
1742 | } | |
1743 | ||
1744 | if ((high_tpt != IWL_INVALID_VALUE) && | |
1745 | (high_tpt > current_tpt)) { | |
1746 | IWL_DEBUG_RATE(mvm, | |
1747 | "Higher rate is better. Increate rate\n"); | |
1748 | return RS_ACTION_UPSCALE; | |
1749 | } | |
1750 | ||
1751 | if ((low_tpt != IWL_INVALID_VALUE) && | |
1752 | (high_tpt != IWL_INVALID_VALUE) && | |
1753 | (low_tpt < current_tpt) && | |
1754 | (high_tpt < current_tpt)) { | |
1755 | IWL_DEBUG_RATE(mvm, | |
1756 | "Both high and low are worse. Maintain rate\n"); | |
1757 | return RS_ACTION_STAY; | |
1758 | } | |
1759 | ||
1760 | if ((low_tpt != IWL_INVALID_VALUE) && | |
1761 | (low_tpt > current_tpt)) { | |
1762 | IWL_DEBUG_RATE(mvm, | |
1763 | "Lower rate is better\n"); | |
1764 | action = RS_ACTION_DOWNSCALE; | |
1765 | goto out; | |
1766 | } | |
1767 | ||
1768 | if ((low_tpt == IWL_INVALID_VALUE) && | |
1769 | (low != IWL_RATE_INVALID)) { | |
1770 | IWL_DEBUG_RATE(mvm, | |
1771 | "No data about lower rate\n"); | |
1772 | action = RS_ACTION_DOWNSCALE; | |
1773 | goto out; | |
1774 | } | |
1775 | ||
1776 | IWL_DEBUG_RATE(mvm, "Maintain rate\n"); | |
1777 | ||
1778 | out: | |
1779 | if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { | |
1780 | if (sr >= RS_SR_NO_DECREASE) { | |
1781 | IWL_DEBUG_RATE(mvm, | |
1782 | "SR is above NO DECREASE. Avoid downscale\n"); | |
1783 | action = RS_ACTION_STAY; | |
1784 | } else if (current_tpt > (100 * tbl->expected_tpt[low])) { | |
1785 | IWL_DEBUG_RATE(mvm, | |
1786 | "Current TPT is higher than max expected in low rate. Avoid downscale\n"); | |
1787 | action = RS_ACTION_STAY; | |
1788 | } else { | |
1789 | IWL_DEBUG_RATE(mvm, "Decrease rate\n"); | |
1790 | } | |
1791 | } | |
1792 | ||
1793 | return action; | |
1794 | } | |
1795 | ||
1796 | static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, | |
1797 | int *weaker, int *stronger) | |
1798 | { | |
1799 | *weaker = index + TPC_TX_POWER_STEP; | |
1800 | if (*weaker > TPC_MAX_REDUCTION) | |
1801 | *weaker = TPC_INVALID; | |
1802 | ||
1803 | *stronger = index - TPC_TX_POWER_STEP; | |
1804 | if (*stronger < 0) | |
1805 | *stronger = TPC_INVALID; | |
1806 | } | |
1807 | ||
1808 | static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct rs_rate *rate, | |
1809 | enum ieee80211_band band) | |
1810 | { | |
1811 | int index = rate->index; | |
1812 | ||
1813 | /* | |
1814 | * allow tpc only if power management is enabled, or bt coex | |
1815 | * activity grade allows it and we are on 2.4Ghz. | |
1816 | */ | |
1817 | if (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM && | |
1818 | !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) | |
1819 | return false; | |
1820 | ||
1821 | IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); | |
1822 | if (is_legacy(rate)) | |
1823 | return index == IWL_RATE_54M_INDEX; | |
1824 | if (is_ht(rate)) | |
1825 | return index == IWL_RATE_MCS_7_INDEX; | |
1826 | if (is_vht(rate)) | |
1827 | return index == IWL_RATE_MCS_7_INDEX || | |
1828 | index == IWL_RATE_MCS_8_INDEX || | |
1829 | index == IWL_RATE_MCS_9_INDEX; | |
1830 | ||
1831 | WARN_ON_ONCE(1); | |
1832 | return false; | |
1833 | } | |
1834 | ||
1835 | enum tpc_action { | |
1836 | TPC_ACTION_STAY, | |
1837 | TPC_ACTION_DECREASE, | |
1838 | TPC_ACTION_INCREASE, | |
1839 | TPC_ACTION_NO_RESTIRCTION, | |
1840 | }; | |
1841 | ||
1842 | static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, | |
1843 | s32 sr, int weak, int strong, | |
1844 | int current_tpt, | |
1845 | int weak_tpt, int strong_tpt) | |
1846 | { | |
1847 | /* stay until we have valid tpt */ | |
1848 | if (current_tpt == IWL_INVALID_VALUE) { | |
1849 | IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); | |
1850 | return TPC_ACTION_STAY; | |
1851 | } | |
1852 | ||
1853 | /* Too many failures, increase txp */ | |
1854 | if (sr <= TPC_SR_FORCE_INCREASE || current_tpt == 0) { | |
1855 | IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); | |
1856 | return TPC_ACTION_NO_RESTIRCTION; | |
1857 | } | |
1858 | ||
1859 | /* try decreasing first if applicable */ | |
1860 | if (weak != TPC_INVALID) { | |
1861 | if (weak_tpt == IWL_INVALID_VALUE && | |
1862 | (strong_tpt == IWL_INVALID_VALUE || | |
1863 | current_tpt >= strong_tpt)) { | |
1864 | IWL_DEBUG_RATE(mvm, | |
1865 | "no weak txp measurement. decrease txp\n"); | |
1866 | return TPC_ACTION_DECREASE; | |
1867 | } | |
1868 | ||
1869 | if (weak_tpt > current_tpt) { | |
1870 | IWL_DEBUG_RATE(mvm, | |
1871 | "lower txp has better tpt. decrease txp\n"); | |
1872 | return TPC_ACTION_DECREASE; | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | /* next, increase if needed */ | |
1877 | if (sr < TPC_SR_NO_INCREASE && strong != TPC_INVALID) { | |
1878 | if (weak_tpt == IWL_INVALID_VALUE && | |
1879 | strong_tpt != IWL_INVALID_VALUE && | |
1880 | current_tpt < strong_tpt) { | |
1881 | IWL_DEBUG_RATE(mvm, | |
1882 | "higher txp has better tpt. increase txp\n"); | |
1883 | return TPC_ACTION_INCREASE; | |
1884 | } | |
1885 | ||
1886 | if (weak_tpt < current_tpt && | |
1887 | (strong_tpt == IWL_INVALID_VALUE || | |
1888 | strong_tpt > current_tpt)) { | |
1889 | IWL_DEBUG_RATE(mvm, | |
1890 | "lower txp has worse tpt. increase txp\n"); | |
1891 | return TPC_ACTION_INCREASE; | |
1892 | } | |
1893 | } | |
1894 | ||
1895 | IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); | |
1896 | return TPC_ACTION_STAY; | |
1897 | } | |
1898 | ||
1899 | static bool rs_tpc_perform(struct iwl_mvm *mvm, | |
1900 | struct ieee80211_sta *sta, | |
1901 | struct iwl_lq_sta *lq_sta, | |
1902 | struct iwl_scale_tbl_info *tbl) | |
1903 | { | |
1904 | struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv; | |
1905 | struct ieee80211_vif *vif = mvm_sta->vif; | |
1906 | struct ieee80211_chanctx_conf *chanctx_conf; | |
1907 | enum ieee80211_band band; | |
1908 | struct iwl_rate_scale_data *window; | |
1909 | struct rs_rate *rate = &tbl->rate; | |
1910 | enum tpc_action action; | |
1911 | s32 sr; | |
1912 | u8 cur = lq_sta->lq.reduced_tpc; | |
1913 | int current_tpt; | |
1914 | int weak, strong; | |
1915 | int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; | |
1916 | ||
1917 | #ifdef CONFIG_MAC80211_DEBUGFS | |
1918 | if (lq_sta->dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { | |
1919 | IWL_DEBUG_RATE(mvm, "fixed tpc: %d", | |
1920 | lq_sta->dbg_fixed_txp_reduction); | |
1921 | lq_sta->lq.reduced_tpc = lq_sta->dbg_fixed_txp_reduction; | |
1922 | return cur != lq_sta->dbg_fixed_txp_reduction; | |
1923 | } | |
1924 | #endif | |
1925 | ||
1926 | rcu_read_lock(); | |
1927 | chanctx_conf = rcu_dereference(vif->chanctx_conf); | |
1928 | if (WARN_ON(!chanctx_conf)) | |
1929 | band = IEEE80211_NUM_BANDS; | |
1930 | else | |
1931 | band = chanctx_conf->def.chan->band; | |
1932 | rcu_read_unlock(); | |
1933 | ||
1934 | if (!rs_tpc_allowed(mvm, rate, band)) { | |
1935 | IWL_DEBUG_RATE(mvm, | |
1936 | "tpc is not allowed. remove txp restrictions"); | |
1937 | lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; | |
1938 | return cur != TPC_NO_REDUCTION; | |
1939 | } | |
1940 | ||
1941 | rs_get_adjacent_txp(mvm, cur, &weak, &strong); | |
1942 | ||
1943 | /* Collect measured throughputs for current and adjacent rates */ | |
1944 | window = tbl->tpc_win; | |
1945 | sr = window[cur].success_ratio; | |
1946 | current_tpt = window[cur].average_tpt; | |
1947 | if (weak != TPC_INVALID) | |
1948 | weak_tpt = window[weak].average_tpt; | |
1949 | if (strong != TPC_INVALID) | |
1950 | strong_tpt = window[strong].average_tpt; | |
1951 | ||
1952 | IWL_DEBUG_RATE(mvm, | |
1953 | "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", | |
1954 | cur, current_tpt, sr, weak, strong, | |
1955 | weak_tpt, strong_tpt); | |
1956 | ||
1957 | action = rs_get_tpc_action(mvm, sr, weak, strong, | |
1958 | current_tpt, weak_tpt, strong_tpt); | |
1959 | ||
1960 | /* override actions if we are on the edge */ | |
1961 | if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { | |
1962 | IWL_DEBUG_RATE(mvm, "already in lowest txp, stay"); | |
1963 | action = TPC_ACTION_STAY; | |
1964 | } else if (strong == TPC_INVALID && | |
1965 | (action == TPC_ACTION_INCREASE || | |
1966 | action == TPC_ACTION_NO_RESTIRCTION)) { | |
1967 | IWL_DEBUG_RATE(mvm, "already in highest txp, stay"); | |
1968 | action = TPC_ACTION_STAY; | |
1969 | } | |
1970 | ||
1971 | switch (action) { | |
1972 | case TPC_ACTION_DECREASE: | |
1973 | lq_sta->lq.reduced_tpc = weak; | |
1974 | return true; | |
1975 | case TPC_ACTION_INCREASE: | |
1976 | lq_sta->lq.reduced_tpc = strong; | |
1977 | return true; | |
1978 | case TPC_ACTION_NO_RESTIRCTION: | |
1979 | lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; | |
1980 | return true; | |
1981 | case TPC_ACTION_STAY: | |
1982 | /* do nothing */ | |
1983 | break; | |
1984 | } | |
1985 | return false; | |
1986 | } | |
1987 | ||
1988 | /* | |
1989 | * Do rate scaling and search for new modulation mode. | |
1990 | */ | |
1991 | static void rs_rate_scale_perform(struct iwl_mvm *mvm, | |
1992 | struct sk_buff *skb, | |
1993 | struct ieee80211_sta *sta, | |
1994 | struct iwl_lq_sta *lq_sta) | |
1995 | { | |
1996 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1997 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1998 | int low = IWL_RATE_INVALID; | |
1999 | int high = IWL_RATE_INVALID; | |
2000 | int index; | |
2001 | struct iwl_rate_scale_data *window = NULL; | |
2002 | int current_tpt = IWL_INVALID_VALUE; | |
2003 | int low_tpt = IWL_INVALID_VALUE; | |
2004 | int high_tpt = IWL_INVALID_VALUE; | |
2005 | u32 fail_count; | |
2006 | enum rs_action scale_action = RS_ACTION_STAY; | |
2007 | u16 rate_mask; | |
2008 | u8 update_lq = 0; | |
2009 | struct iwl_scale_tbl_info *tbl, *tbl1; | |
2010 | u8 active_tbl = 0; | |
2011 | u8 done_search = 0; | |
2012 | u16 high_low; | |
2013 | s32 sr; | |
2014 | u8 tid = IWL_MAX_TID_COUNT; | |
2015 | u8 prev_agg = lq_sta->is_agg; | |
2016 | struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv; | |
2017 | struct iwl_mvm_tid_data *tid_data; | |
2018 | struct rs_rate *rate; | |
2019 | ||
2020 | /* Send management frames and NO_ACK data using lowest rate. */ | |
2021 | /* TODO: this could probably be improved.. */ | |
2022 | if (!ieee80211_is_data(hdr->frame_control) || | |
2023 | info->flags & IEEE80211_TX_CTL_NO_ACK) | |
2024 | return; | |
2025 | ||
2026 | tid = rs_get_tid(lq_sta, hdr); | |
2027 | if ((tid != IWL_MAX_TID_COUNT) && | |
2028 | (lq_sta->tx_agg_tid_en & (1 << tid))) { | |
2029 | tid_data = &sta_priv->tid_data[tid]; | |
2030 | if (tid_data->state == IWL_AGG_OFF) | |
2031 | lq_sta->is_agg = 0; | |
2032 | else | |
2033 | lq_sta->is_agg = 1; | |
2034 | } else { | |
2035 | lq_sta->is_agg = 0; | |
2036 | } | |
2037 | ||
2038 | /* | |
2039 | * Select rate-scale / modulation-mode table to work with in | |
2040 | * the rest of this function: "search" if searching for better | |
2041 | * modulation mode, or "active" if doing rate scaling within a mode. | |
2042 | */ | |
2043 | if (!lq_sta->search_better_tbl) | |
2044 | active_tbl = lq_sta->active_tbl; | |
2045 | else | |
2046 | active_tbl = 1 - lq_sta->active_tbl; | |
2047 | ||
2048 | tbl = &(lq_sta->lq_info[active_tbl]); | |
2049 | rate = &tbl->rate; | |
2050 | ||
2051 | if (prev_agg != lq_sta->is_agg) { | |
2052 | IWL_DEBUG_RATE(mvm, | |
2053 | "Aggregation changed: prev %d current %d. Update expected TPT table\n", | |
2054 | prev_agg, lq_sta->is_agg); | |
2055 | rs_set_expected_tpt_table(lq_sta, tbl); | |
2056 | rs_rate_scale_clear_tbl_windows(mvm, tbl); | |
2057 | } | |
2058 | ||
2059 | /* current tx rate */ | |
2060 | index = lq_sta->last_txrate_idx; | |
2061 | ||
2062 | /* rates available for this association, and for modulation mode */ | |
2063 | rate_mask = rs_get_supported_rates(lq_sta, rate); | |
2064 | ||
2065 | if (!(BIT(index) & rate_mask)) { | |
2066 | IWL_ERR(mvm, "Current Rate is not valid\n"); | |
2067 | if (lq_sta->search_better_tbl) { | |
2068 | /* revert to active table if search table is not valid*/ | |
2069 | rate->type = LQ_NONE; | |
2070 | lq_sta->search_better_tbl = 0; | |
2071 | tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
2072 | rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate); | |
2073 | } | |
2074 | return; | |
2075 | } | |
2076 | ||
2077 | /* Get expected throughput table and history window for current rate */ | |
2078 | if (!tbl->expected_tpt) { | |
2079 | IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); | |
2080 | return; | |
2081 | } | |
2082 | ||
2083 | /* force user max rate if set by user */ | |
2084 | if ((lq_sta->max_rate_idx != -1) && | |
2085 | (lq_sta->max_rate_idx < index)) { | |
2086 | index = lq_sta->max_rate_idx; | |
2087 | update_lq = 1; | |
2088 | window = &(tbl->win[index]); | |
2089 | IWL_DEBUG_RATE(mvm, | |
2090 | "Forcing user max rate %d\n", | |
2091 | index); | |
2092 | goto lq_update; | |
2093 | } | |
2094 | ||
2095 | window = &(tbl->win[index]); | |
2096 | ||
2097 | /* | |
2098 | * If there is not enough history to calculate actual average | |
2099 | * throughput, keep analyzing results of more tx frames, without | |
2100 | * changing rate or mode (bypass most of the rest of this function). | |
2101 | * Set up new rate table in uCode only if old rate is not supported | |
2102 | * in current association (use new rate found above). | |
2103 | */ | |
2104 | fail_count = window->counter - window->success_counter; | |
2105 | if ((fail_count < IWL_RATE_MIN_FAILURE_TH) && | |
2106 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) { | |
2107 | IWL_DEBUG_RATE(mvm, | |
2108 | "(%s: %d): Test Window: succ %d total %d\n", | |
2109 | rs_pretty_lq_type(rate->type), | |
2110 | index, window->success_counter, window->counter); | |
2111 | ||
2112 | /* Can't calculate this yet; not enough history */ | |
2113 | window->average_tpt = IWL_INVALID_VALUE; | |
2114 | ||
2115 | /* Should we stay with this modulation mode, | |
2116 | * or search for a new one? */ | |
2117 | rs_stay_in_table(lq_sta, false); | |
2118 | ||
2119 | goto out; | |
2120 | } | |
2121 | /* Else we have enough samples; calculate estimate of | |
2122 | * actual average throughput */ | |
2123 | if (window->average_tpt != ((window->success_ratio * | |
2124 | tbl->expected_tpt[index] + 64) / 128)) { | |
2125 | window->average_tpt = ((window->success_ratio * | |
2126 | tbl->expected_tpt[index] + 64) / 128); | |
2127 | } | |
2128 | ||
2129 | /* If we are searching for better modulation mode, check success. */ | |
2130 | if (lq_sta->search_better_tbl) { | |
2131 | /* If good success, continue using the "search" mode; | |
2132 | * no need to send new link quality command, since we're | |
2133 | * continuing to use the setup that we've been trying. */ | |
2134 | if (window->average_tpt > lq_sta->last_tpt) { | |
2135 | IWL_DEBUG_RATE(mvm, | |
2136 | "SWITCHING TO NEW TABLE SR: %d " | |
2137 | "cur-tpt %d old-tpt %d\n", | |
2138 | window->success_ratio, | |
2139 | window->average_tpt, | |
2140 | lq_sta->last_tpt); | |
2141 | ||
2142 | /* Swap tables; "search" becomes "active" */ | |
2143 | lq_sta->active_tbl = active_tbl; | |
2144 | current_tpt = window->average_tpt; | |
2145 | /* Else poor success; go back to mode in "active" table */ | |
2146 | } else { | |
2147 | IWL_DEBUG_RATE(mvm, | |
2148 | "GOING BACK TO THE OLD TABLE: SR %d " | |
2149 | "cur-tpt %d old-tpt %d\n", | |
2150 | window->success_ratio, | |
2151 | window->average_tpt, | |
2152 | lq_sta->last_tpt); | |
2153 | ||
2154 | /* Nullify "search" table */ | |
2155 | rate->type = LQ_NONE; | |
2156 | ||
2157 | /* Revert to "active" table */ | |
2158 | active_tbl = lq_sta->active_tbl; | |
2159 | tbl = &(lq_sta->lq_info[active_tbl]); | |
2160 | ||
2161 | /* Revert to "active" rate and throughput info */ | |
2162 | index = tbl->rate.index; | |
2163 | current_tpt = lq_sta->last_tpt; | |
2164 | ||
2165 | /* Need to set up a new rate table in uCode */ | |
2166 | update_lq = 1; | |
2167 | } | |
2168 | ||
2169 | /* Either way, we've made a decision; modulation mode | |
2170 | * search is done, allow rate adjustment next time. */ | |
2171 | lq_sta->search_better_tbl = 0; | |
2172 | done_search = 1; /* Don't switch modes below! */ | |
2173 | goto lq_update; | |
2174 | } | |
2175 | ||
2176 | /* (Else) not in search of better modulation mode, try for better | |
2177 | * starting rate, while staying in this mode. */ | |
2178 | high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); | |
2179 | low = high_low & 0xff; | |
2180 | high = (high_low >> 8) & 0xff; | |
2181 | ||
2182 | /* If user set max rate, dont allow higher than user constrain */ | |
2183 | if ((lq_sta->max_rate_idx != -1) && | |
2184 | (lq_sta->max_rate_idx < high)) | |
2185 | high = IWL_RATE_INVALID; | |
2186 | ||
2187 | sr = window->success_ratio; | |
2188 | ||
2189 | /* Collect measured throughputs for current and adjacent rates */ | |
2190 | current_tpt = window->average_tpt; | |
2191 | if (low != IWL_RATE_INVALID) | |
2192 | low_tpt = tbl->win[low].average_tpt; | |
2193 | if (high != IWL_RATE_INVALID) | |
2194 | high_tpt = tbl->win[high].average_tpt; | |
2195 | ||
2196 | IWL_DEBUG_RATE(mvm, | |
2197 | "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", | |
2198 | rs_pretty_lq_type(rate->type), index, current_tpt, sr, | |
2199 | low, high, low_tpt, high_tpt); | |
2200 | ||
2201 | scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, | |
2202 | current_tpt, low_tpt, high_tpt); | |
2203 | ||
2204 | /* Force a search in case BT doesn't like us being in MIMO */ | |
2205 | if (is_mimo(rate) && | |
2206 | !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { | |
2207 | IWL_DEBUG_RATE(mvm, | |
2208 | "BT Coex forbids MIMO. Search for new config\n"); | |
2209 | rs_stay_in_table(lq_sta, true); | |
2210 | goto lq_update; | |
2211 | } | |
2212 | ||
2213 | switch (scale_action) { | |
2214 | case RS_ACTION_DOWNSCALE: | |
2215 | /* Decrease starting rate, update uCode's rate table */ | |
2216 | if (low != IWL_RATE_INVALID) { | |
2217 | update_lq = 1; | |
2218 | index = low; | |
2219 | } else { | |
2220 | IWL_DEBUG_RATE(mvm, | |
2221 | "At the bottom rate. Can't decrease\n"); | |
2222 | } | |
2223 | ||
2224 | break; | |
2225 | case RS_ACTION_UPSCALE: | |
2226 | /* Increase starting rate, update uCode's rate table */ | |
2227 | if (high != IWL_RATE_INVALID) { | |
2228 | update_lq = 1; | |
2229 | index = high; | |
2230 | } else { | |
2231 | IWL_DEBUG_RATE(mvm, | |
2232 | "At the top rate. Can't increase\n"); | |
2233 | } | |
2234 | ||
2235 | break; | |
2236 | case RS_ACTION_STAY: | |
2237 | /* No change */ | |
2238 | update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); | |
2239 | break; | |
2240 | default: | |
2241 | break; | |
2242 | } | |
2243 | ||
2244 | lq_update: | |
2245 | /* Replace uCode's rate table for the destination station. */ | |
2246 | if (update_lq) { | |
2247 | tbl->rate.index = index; | |
2248 | rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate); | |
2249 | } | |
2250 | ||
2251 | rs_stay_in_table(lq_sta, false); | |
2252 | ||
2253 | /* | |
2254 | * Search for new modulation mode if we're: | |
2255 | * 1) Not changing rates right now | |
2256 | * 2) Not just finishing up a search | |
2257 | * 3) Allowing a new search | |
2258 | */ | |
2259 | if (!update_lq && !done_search && | |
2260 | lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED | |
2261 | && window->counter) { | |
2262 | enum rs_column next_column; | |
2263 | ||
2264 | /* Save current throughput to compare with "search" throughput*/ | |
2265 | lq_sta->last_tpt = current_tpt; | |
2266 | ||
2267 | IWL_DEBUG_RATE(mvm, | |
2268 | "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", | |
2269 | update_lq, done_search, lq_sta->rs_state, | |
2270 | window->counter); | |
2271 | ||
2272 | next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); | |
2273 | if (next_column != RS_COLUMN_INVALID) { | |
2274 | int ret = rs_switch_to_column(mvm, lq_sta, sta, | |
2275 | next_column); | |
2276 | if (!ret) | |
2277 | lq_sta->search_better_tbl = 1; | |
2278 | } else { | |
2279 | IWL_DEBUG_RATE(mvm, | |
2280 | "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); | |
2281 | lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; | |
2282 | } | |
2283 | ||
2284 | /* If new "search" mode was selected, set up in uCode table */ | |
2285 | if (lq_sta->search_better_tbl) { | |
2286 | /* Access the "search" table, clear its history. */ | |
2287 | tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); | |
2288 | rs_rate_scale_clear_tbl_windows(mvm, tbl); | |
2289 | ||
2290 | /* Use new "search" start rate */ | |
2291 | index = tbl->rate.index; | |
2292 | ||
2293 | rs_dump_rate(mvm, &tbl->rate, | |
2294 | "Switch to SEARCH TABLE:"); | |
2295 | rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); | |
2296 | iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); | |
2297 | } else { | |
2298 | done_search = 1; | |
2299 | } | |
2300 | } | |
2301 | ||
2302 | if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { | |
2303 | /* If the "active" (non-search) mode was legacy, | |
2304 | * and we've tried switching antennas, | |
2305 | * but we haven't been able to try HT modes (not available), | |
2306 | * stay with best antenna legacy modulation for a while | |
2307 | * before next round of mode comparisons. */ | |
2308 | tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
2309 | if (is_legacy(&tbl1->rate)) { | |
2310 | IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); | |
2311 | ||
2312 | if (tid != IWL_MAX_TID_COUNT) { | |
2313 | tid_data = &sta_priv->tid_data[tid]; | |
2314 | if (tid_data->state != IWL_AGG_OFF) { | |
2315 | IWL_DEBUG_RATE(mvm, | |
2316 | "Stop aggregation on tid %d\n", | |
2317 | tid); | |
2318 | ieee80211_stop_tx_ba_session(sta, tid); | |
2319 | } | |
2320 | } | |
2321 | rs_set_stay_in_table(mvm, 1, lq_sta); | |
2322 | } else { | |
2323 | /* If we're in an HT mode, and all 3 mode switch actions | |
2324 | * have been tried and compared, stay in this best modulation | |
2325 | * mode for a while before next round of mode comparisons. */ | |
2326 | if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && | |
2327 | (lq_sta->tx_agg_tid_en & (1 << tid)) && | |
2328 | (tid != IWL_MAX_TID_COUNT)) { | |
2329 | tid_data = &sta_priv->tid_data[tid]; | |
2330 | if (tid_data->state == IWL_AGG_OFF) { | |
2331 | IWL_DEBUG_RATE(mvm, | |
2332 | "try to aggregate tid %d\n", | |
2333 | tid); | |
2334 | rs_tl_turn_on_agg(mvm, tid, | |
2335 | lq_sta, sta); | |
2336 | } | |
2337 | } | |
2338 | rs_set_stay_in_table(mvm, 0, lq_sta); | |
2339 | } | |
2340 | } | |
2341 | ||
2342 | out: | |
2343 | lq_sta->last_txrate_idx = index; | |
2344 | } | |
2345 | ||
2346 | /** | |
2347 | * rs_initialize_lq - Initialize a station's hardware rate table | |
2348 | * | |
2349 | * The uCode's station table contains a table of fallback rates | |
2350 | * for automatic fallback during transmission. | |
2351 | * | |
2352 | * NOTE: This sets up a default set of values. These will be replaced later | |
2353 | * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of | |
2354 | * rc80211_simple. | |
2355 | * | |
2356 | * NOTE: Run REPLY_ADD_STA command to set up station table entry, before | |
2357 | * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, | |
2358 | * which requires station table entry to exist). | |
2359 | */ | |
2360 | static void rs_initialize_lq(struct iwl_mvm *mvm, | |
2361 | struct ieee80211_sta *sta, | |
2362 | struct iwl_lq_sta *lq_sta, | |
2363 | enum ieee80211_band band, | |
2364 | bool init) | |
2365 | { | |
2366 | struct iwl_scale_tbl_info *tbl; | |
2367 | struct rs_rate *rate; | |
2368 | int i; | |
2369 | u8 active_tbl = 0; | |
2370 | u8 valid_tx_ant; | |
2371 | ||
2372 | if (!sta || !lq_sta) | |
2373 | return; | |
2374 | ||
2375 | i = lq_sta->last_txrate_idx; | |
2376 | ||
2377 | valid_tx_ant = mvm->fw->valid_tx_ant; | |
2378 | ||
2379 | if (!lq_sta->search_better_tbl) | |
2380 | active_tbl = lq_sta->active_tbl; | |
2381 | else | |
2382 | active_tbl = 1 - lq_sta->active_tbl; | |
2383 | ||
2384 | tbl = &(lq_sta->lq_info[active_tbl]); | |
2385 | rate = &tbl->rate; | |
2386 | ||
2387 | if ((i < 0) || (i >= IWL_RATE_COUNT)) | |
2388 | i = 0; | |
2389 | ||
2390 | rate->index = i; | |
2391 | rate->ant = first_antenna(valid_tx_ant); | |
2392 | rate->sgi = false; | |
2393 | rate->bw = RATE_MCS_CHAN_WIDTH_20; | |
2394 | if (band == IEEE80211_BAND_5GHZ) | |
2395 | rate->type = LQ_LEGACY_A; | |
2396 | else | |
2397 | rate->type = LQ_LEGACY_G; | |
2398 | ||
2399 | WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); | |
2400 | if (rate->ant == ANT_A) | |
2401 | tbl->column = RS_COLUMN_LEGACY_ANT_A; | |
2402 | else | |
2403 | tbl->column = RS_COLUMN_LEGACY_ANT_B; | |
2404 | ||
2405 | rs_set_expected_tpt_table(lq_sta, tbl); | |
2406 | rs_fill_lq_cmd(mvm, sta, lq_sta, rate); | |
2407 | /* TODO restore station should remember the lq cmd */ | |
2408 | iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); | |
2409 | } | |
2410 | ||
2411 | static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, | |
2412 | struct ieee80211_tx_rate_control *txrc) | |
2413 | { | |
2414 | struct sk_buff *skb = txrc->skb; | |
2415 | struct ieee80211_supported_band *sband = txrc->sband; | |
2416 | struct iwl_op_mode *op_mode __maybe_unused = | |
2417 | (struct iwl_op_mode *)mvm_r; | |
2418 | struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); | |
2419 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
2420 | struct iwl_lq_sta *lq_sta = mvm_sta; | |
2421 | ||
2422 | /* Get max rate if user set max rate */ | |
2423 | if (lq_sta) { | |
2424 | lq_sta->max_rate_idx = txrc->max_rate_idx; | |
2425 | if ((sband->band == IEEE80211_BAND_5GHZ) && | |
2426 | (lq_sta->max_rate_idx != -1)) | |
2427 | lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE; | |
2428 | if ((lq_sta->max_rate_idx < 0) || | |
2429 | (lq_sta->max_rate_idx >= IWL_RATE_COUNT)) | |
2430 | lq_sta->max_rate_idx = -1; | |
2431 | } | |
2432 | ||
2433 | /* Treat uninitialized rate scaling data same as non-existing. */ | |
2434 | if (lq_sta && !lq_sta->drv) { | |
2435 | IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); | |
2436 | mvm_sta = NULL; | |
2437 | } | |
2438 | ||
2439 | /* Send management frames and NO_ACK data using lowest rate. */ | |
2440 | if (rate_control_send_low(sta, mvm_sta, txrc)) | |
2441 | return; | |
2442 | ||
2443 | iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, | |
2444 | info->band, &info->control.rates[0]); | |
2445 | ||
2446 | info->control.rates[0].count = 1; | |
2447 | } | |
2448 | ||
2449 | static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, | |
2450 | gfp_t gfp) | |
2451 | { | |
2452 | struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv; | |
2453 | struct iwl_op_mode *op_mode __maybe_unused = | |
2454 | (struct iwl_op_mode *)mvm_rate; | |
2455 | struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); | |
2456 | ||
2457 | IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); | |
2458 | ||
2459 | return &sta_priv->lq_sta; | |
2460 | } | |
2461 | ||
2462 | static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, | |
2463 | int nss) | |
2464 | { | |
2465 | u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & | |
2466 | (0x3 << (2 * (nss - 1))); | |
2467 | rx_mcs >>= (2 * (nss - 1)); | |
2468 | ||
2469 | if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) | |
2470 | return IWL_RATE_MCS_7_INDEX; | |
2471 | else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) | |
2472 | return IWL_RATE_MCS_8_INDEX; | |
2473 | else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) | |
2474 | return IWL_RATE_MCS_9_INDEX; | |
2475 | ||
2476 | WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); | |
2477 | return -1; | |
2478 | } | |
2479 | ||
2480 | static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, | |
2481 | struct ieee80211_sta_vht_cap *vht_cap, | |
2482 | struct iwl_lq_sta *lq_sta) | |
2483 | { | |
2484 | int i; | |
2485 | int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); | |
2486 | ||
2487 | if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { | |
2488 | for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { | |
2489 | if (i == IWL_RATE_9M_INDEX) | |
2490 | continue; | |
2491 | ||
2492 | /* Disable MCS9 as a workaround */ | |
2493 | if (i == IWL_RATE_MCS_9_INDEX) | |
2494 | continue; | |
2495 | ||
2496 | /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ | |
2497 | if (i == IWL_RATE_MCS_9_INDEX && | |
2498 | sta->bandwidth == IEEE80211_STA_RX_BW_20) | |
2499 | continue; | |
2500 | ||
2501 | lq_sta->active_siso_rate |= BIT(i); | |
2502 | } | |
2503 | } | |
2504 | ||
2505 | if (sta->rx_nss < 2) | |
2506 | return; | |
2507 | ||
2508 | highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); | |
2509 | if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { | |
2510 | for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { | |
2511 | if (i == IWL_RATE_9M_INDEX) | |
2512 | continue; | |
2513 | ||
2514 | /* Disable MCS9 as a workaround */ | |
2515 | if (i == IWL_RATE_MCS_9_INDEX) | |
2516 | continue; | |
2517 | ||
2518 | /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ | |
2519 | if (i == IWL_RATE_MCS_9_INDEX && | |
2520 | sta->bandwidth == IEEE80211_STA_RX_BW_20) | |
2521 | continue; | |
2522 | ||
2523 | lq_sta->active_mimo2_rate |= BIT(i); | |
2524 | } | |
2525 | } | |
2526 | } | |
2527 | ||
2528 | #ifdef CONFIG_IWLWIFI_DEBUGFS | |
2529 | static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm, | |
2530 | struct iwl_mvm_frame_stats *stats) | |
2531 | { | |
2532 | spin_lock_bh(&mvm->drv_stats_lock); | |
2533 | memset(stats, 0, sizeof(*stats)); | |
2534 | spin_unlock_bh(&mvm->drv_stats_lock); | |
2535 | } | |
2536 | ||
2537 | void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, | |
2538 | struct iwl_mvm_frame_stats *stats, | |
2539 | u32 rate, bool agg) | |
2540 | { | |
2541 | u8 nss = 0, mcs = 0; | |
2542 | ||
2543 | spin_lock(&mvm->drv_stats_lock); | |
2544 | ||
2545 | if (agg) | |
2546 | stats->agg_frames++; | |
2547 | ||
2548 | stats->success_frames++; | |
2549 | ||
2550 | switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { | |
2551 | case RATE_MCS_CHAN_WIDTH_20: | |
2552 | stats->bw_20_frames++; | |
2553 | break; | |
2554 | case RATE_MCS_CHAN_WIDTH_40: | |
2555 | stats->bw_40_frames++; | |
2556 | break; | |
2557 | case RATE_MCS_CHAN_WIDTH_80: | |
2558 | stats->bw_80_frames++; | |
2559 | break; | |
2560 | default: | |
2561 | WARN_ONCE(1, "bad BW. rate 0x%x", rate); | |
2562 | } | |
2563 | ||
2564 | if (rate & RATE_MCS_HT_MSK) { | |
2565 | stats->ht_frames++; | |
2566 | mcs = rate & RATE_HT_MCS_RATE_CODE_MSK; | |
2567 | nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; | |
2568 | } else if (rate & RATE_MCS_VHT_MSK) { | |
2569 | stats->vht_frames++; | |
2570 | mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; | |
2571 | nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> | |
2572 | RATE_VHT_MCS_NSS_POS) + 1; | |
2573 | } else { | |
2574 | stats->legacy_frames++; | |
2575 | } | |
2576 | ||
2577 | if (nss == 1) | |
2578 | stats->siso_frames++; | |
2579 | else if (nss == 2) | |
2580 | stats->mimo2_frames++; | |
2581 | ||
2582 | if (rate & RATE_MCS_SGI_MSK) | |
2583 | stats->sgi_frames++; | |
2584 | else | |
2585 | stats->ngi_frames++; | |
2586 | ||
2587 | stats->last_rates[stats->last_frame_idx] = rate; | |
2588 | stats->last_frame_idx = (stats->last_frame_idx + 1) % | |
2589 | ARRAY_SIZE(stats->last_rates); | |
2590 | ||
2591 | spin_unlock(&mvm->drv_stats_lock); | |
2592 | } | |
2593 | #endif | |
2594 | ||
2595 | /* | |
2596 | * Called after adding a new station to initialize rate scaling | |
2597 | */ | |
2598 | void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, | |
2599 | enum ieee80211_band band, bool init) | |
2600 | { | |
2601 | int i, j; | |
2602 | struct ieee80211_hw *hw = mvm->hw; | |
2603 | struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; | |
2604 | struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; | |
2605 | struct iwl_mvm_sta *sta_priv; | |
2606 | struct iwl_lq_sta *lq_sta; | |
2607 | struct ieee80211_supported_band *sband; | |
2608 | unsigned long supp; /* must be unsigned long for for_each_set_bit */ | |
2609 | ||
2610 | sta_priv = (struct iwl_mvm_sta *)sta->drv_priv; | |
2611 | lq_sta = &sta_priv->lq_sta; | |
2612 | memset(lq_sta, 0, sizeof(*lq_sta)); | |
2613 | ||
2614 | sband = hw->wiphy->bands[band]; | |
2615 | ||
2616 | lq_sta->lq.sta_id = sta_priv->sta_id; | |
2617 | ||
2618 | for (j = 0; j < LQ_SIZE; j++) | |
2619 | rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); | |
2620 | ||
2621 | lq_sta->flush_timer = 0; | |
2622 | lq_sta->last_tx = jiffies; | |
2623 | ||
2624 | IWL_DEBUG_RATE(mvm, | |
2625 | "LQ: *** rate scale station global init for station %d ***\n", | |
2626 | sta_priv->sta_id); | |
2627 | /* TODO: what is a good starting rate for STA? About middle? Maybe not | |
2628 | * the lowest or the highest rate.. Could consider using RSSI from | |
2629 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
2630 | * after assoc.. */ | |
2631 | ||
2632 | lq_sta->max_rate_idx = -1; | |
2633 | lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX; | |
2634 | lq_sta->band = sband->band; | |
2635 | /* | |
2636 | * active legacy rates as per supported rates bitmap | |
2637 | */ | |
2638 | supp = sta->supp_rates[sband->band]; | |
2639 | lq_sta->active_legacy_rate = 0; | |
2640 | for_each_set_bit(i, &supp, BITS_PER_LONG) | |
2641 | lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); | |
2642 | ||
2643 | /* TODO: should probably account for rx_highest for both HT/VHT */ | |
2644 | if (!vht_cap || !vht_cap->vht_supported) { | |
2645 | /* active_siso_rate mask includes 9 MBits (bit 5), | |
2646 | * and CCK (bits 0-3), supp_rates[] does not; | |
2647 | * shift to convert format, force 9 MBits off. | |
2648 | */ | |
2649 | lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; | |
2650 | lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; | |
2651 | lq_sta->active_siso_rate &= ~((u16)0x2); | |
2652 | lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; | |
2653 | ||
2654 | /* Same here */ | |
2655 | lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; | |
2656 | lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; | |
2657 | lq_sta->active_mimo2_rate &= ~((u16)0x2); | |
2658 | lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; | |
2659 | ||
2660 | lq_sta->is_vht = false; | |
2661 | } else { | |
2662 | rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); | |
2663 | lq_sta->is_vht = true; | |
2664 | } | |
2665 | ||
2666 | lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate, | |
2667 | BITS_PER_LONG); | |
2668 | lq_sta->max_siso_rate_idx = find_last_bit(&lq_sta->active_siso_rate, | |
2669 | BITS_PER_LONG); | |
2670 | lq_sta->max_mimo2_rate_idx = find_last_bit(&lq_sta->active_mimo2_rate, | |
2671 | BITS_PER_LONG); | |
2672 | ||
2673 | IWL_DEBUG_RATE(mvm, "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d\n", | |
2674 | lq_sta->active_legacy_rate, | |
2675 | lq_sta->active_siso_rate, | |
2676 | lq_sta->active_mimo2_rate, | |
2677 | lq_sta->is_vht); | |
2678 | IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", | |
2679 | lq_sta->max_legacy_rate_idx, | |
2680 | lq_sta->max_siso_rate_idx, | |
2681 | lq_sta->max_mimo2_rate_idx); | |
2682 | ||
2683 | /* These values will be overridden later */ | |
2684 | lq_sta->lq.single_stream_ant_msk = | |
2685 | first_antenna(mvm->fw->valid_tx_ant); | |
2686 | lq_sta->lq.dual_stream_ant_msk = ANT_AB; | |
2687 | ||
2688 | /* as default allow aggregation for all tids */ | |
2689 | lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; | |
2690 | lq_sta->drv = mvm; | |
2691 | ||
2692 | /* Set last_txrate_idx to lowest rate */ | |
2693 | lq_sta->last_txrate_idx = rate_lowest_index(sband, sta); | |
2694 | if (sband->band == IEEE80211_BAND_5GHZ) | |
2695 | lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; | |
2696 | lq_sta->is_agg = 0; | |
2697 | #ifdef CONFIG_MAC80211_DEBUGFS | |
2698 | lq_sta->dbg_fixed_rate = 0; | |
2699 | lq_sta->dbg_fixed_txp_reduction = TPC_INVALID; | |
2700 | #endif | |
2701 | #ifdef CONFIG_IWLWIFI_DEBUGFS | |
2702 | iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats); | |
2703 | #endif | |
2704 | rs_initialize_lq(mvm, sta, lq_sta, band, init); | |
2705 | } | |
2706 | ||
2707 | static void rs_rate_update(void *mvm_r, | |
2708 | struct ieee80211_supported_band *sband, | |
2709 | struct cfg80211_chan_def *chandef, | |
2710 | struct ieee80211_sta *sta, void *priv_sta, | |
2711 | u32 changed) | |
2712 | { | |
2713 | u8 tid; | |
2714 | struct iwl_op_mode *op_mode = | |
2715 | (struct iwl_op_mode *)mvm_r; | |
2716 | struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); | |
2717 | ||
2718 | /* Stop any ongoing aggregations as rs starts off assuming no agg */ | |
2719 | for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) | |
2720 | ieee80211_stop_tx_ba_session(sta, tid); | |
2721 | ||
2722 | iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); | |
2723 | } | |
2724 | ||
2725 | #ifdef CONFIG_MAC80211_DEBUGFS | |
2726 | static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, | |
2727 | struct iwl_lq_cmd *lq_cmd, | |
2728 | enum ieee80211_band band, | |
2729 | u32 ucode_rate) | |
2730 | { | |
2731 | struct rs_rate rate; | |
2732 | int i; | |
2733 | int num_rates = ARRAY_SIZE(lq_cmd->rs_table); | |
2734 | __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); | |
2735 | ||
2736 | for (i = 0; i < num_rates; i++) | |
2737 | lq_cmd->rs_table[i] = ucode_rate_le32; | |
2738 | ||
2739 | rs_rate_from_ucode_rate(ucode_rate, band, &rate); | |
2740 | ||
2741 | if (is_mimo(&rate)) | |
2742 | lq_cmd->mimo_delim = num_rates - 1; | |
2743 | else | |
2744 | lq_cmd->mimo_delim = 0; | |
2745 | } | |
2746 | #endif /* CONFIG_MAC80211_DEBUGFS */ | |
2747 | ||
2748 | static void rs_fill_rates_for_column(struct iwl_mvm *mvm, | |
2749 | struct iwl_lq_sta *lq_sta, | |
2750 | struct rs_rate *rate, | |
2751 | __le32 *rs_table, int *rs_table_index, | |
2752 | int num_rates, int num_retries, | |
2753 | u8 valid_tx_ant, bool toggle_ant) | |
2754 | { | |
2755 | int i, j; | |
2756 | __le32 ucode_rate; | |
2757 | bool bottom_reached = false; | |
2758 | int prev_rate_idx = rate->index; | |
2759 | int end = LINK_QUAL_MAX_RETRY_NUM; | |
2760 | int index = *rs_table_index; | |
2761 | ||
2762 | for (i = 0; i < num_rates && index < end; i++) { | |
2763 | ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate)); | |
2764 | for (j = 0; j < num_retries && index < end; j++, index++) | |
2765 | rs_table[index] = ucode_rate; | |
2766 | ||
2767 | if (toggle_ant) | |
2768 | rs_toggle_antenna(valid_tx_ant, rate); | |
2769 | ||
2770 | prev_rate_idx = rate->index; | |
2771 | bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); | |
2772 | if (bottom_reached && !is_legacy(rate)) | |
2773 | break; | |
2774 | } | |
2775 | ||
2776 | if (!bottom_reached) | |
2777 | rate->index = prev_rate_idx; | |
2778 | ||
2779 | *rs_table_index = index; | |
2780 | } | |
2781 | ||
2782 | /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI | |
2783 | * column the rate table should look like this: | |
2784 | * | |
2785 | * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI | |
2786 | * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI | |
2787 | * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI | |
2788 | * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI | |
2789 | * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI | |
2790 | * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI | |
2791 | * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI | |
2792 | * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI | |
2793 | * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI | |
2794 | * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps | |
2795 | * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps | |
2796 | * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps | |
2797 | * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps | |
2798 | * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps | |
2799 | * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps | |
2800 | * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps | |
2801 | */ | |
2802 | static void rs_build_rates_table(struct iwl_mvm *mvm, | |
2803 | struct iwl_lq_sta *lq_sta, | |
2804 | const struct rs_rate *initial_rate) | |
2805 | { | |
2806 | struct rs_rate rate; | |
2807 | int num_rates, num_retries, index = 0; | |
2808 | u8 valid_tx_ant = 0; | |
2809 | struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; | |
2810 | bool toggle_ant = false; | |
2811 | ||
2812 | memcpy(&rate, initial_rate, sizeof(rate)); | |
2813 | ||
2814 | valid_tx_ant = mvm->fw->valid_tx_ant; | |
2815 | ||
2816 | if (is_siso(&rate)) { | |
2817 | num_rates = RS_INITIAL_SISO_NUM_RATES; | |
2818 | num_retries = RS_HT_VHT_RETRIES_PER_RATE; | |
2819 | } else if (is_mimo(&rate)) { | |
2820 | num_rates = RS_INITIAL_MIMO_NUM_RATES; | |
2821 | num_retries = RS_HT_VHT_RETRIES_PER_RATE; | |
2822 | } else { | |
2823 | num_rates = RS_INITIAL_LEGACY_NUM_RATES; | |
2824 | num_retries = RS_LEGACY_RETRIES_PER_RATE; | |
2825 | toggle_ant = true; | |
2826 | } | |
2827 | ||
2828 | rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, | |
2829 | num_rates, num_retries, valid_tx_ant, | |
2830 | toggle_ant); | |
2831 | ||
2832 | rs_get_lower_rate_down_column(lq_sta, &rate); | |
2833 | ||
2834 | if (is_siso(&rate)) { | |
2835 | num_rates = RS_SECONDARY_SISO_NUM_RATES; | |
2836 | num_retries = RS_SECONDARY_SISO_RETRIES; | |
2837 | lq_cmd->mimo_delim = index; | |
2838 | } else if (is_legacy(&rate)) { | |
2839 | num_rates = RS_SECONDARY_LEGACY_NUM_RATES; | |
2840 | num_retries = RS_LEGACY_RETRIES_PER_RATE; | |
2841 | } else { | |
2842 | WARN_ON_ONCE(1); | |
2843 | } | |
2844 | ||
2845 | toggle_ant = true; | |
2846 | ||
2847 | rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, | |
2848 | num_rates, num_retries, valid_tx_ant, | |
2849 | toggle_ant); | |
2850 | ||
2851 | rs_get_lower_rate_down_column(lq_sta, &rate); | |
2852 | ||
2853 | num_rates = RS_SECONDARY_LEGACY_NUM_RATES; | |
2854 | num_retries = RS_LEGACY_RETRIES_PER_RATE; | |
2855 | ||
2856 | rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, | |
2857 | num_rates, num_retries, valid_tx_ant, | |
2858 | toggle_ant); | |
2859 | ||
2860 | } | |
2861 | ||
2862 | static void rs_fill_lq_cmd(struct iwl_mvm *mvm, | |
2863 | struct ieee80211_sta *sta, | |
2864 | struct iwl_lq_sta *lq_sta, | |
2865 | const struct rs_rate *initial_rate) | |
2866 | { | |
2867 | struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; | |
2868 | u8 ant = initial_rate->ant; | |
2869 | ||
2870 | #ifdef CONFIG_MAC80211_DEBUGFS | |
2871 | if (lq_sta->dbg_fixed_rate) { | |
2872 | rs_build_rates_table_from_fixed(mvm, lq_cmd, | |
2873 | lq_sta->band, | |
2874 | lq_sta->dbg_fixed_rate); | |
2875 | lq_cmd->reduced_tpc = 0; | |
2876 | ant = (lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >> | |
2877 | RATE_MCS_ANT_POS; | |
2878 | } else | |
2879 | #endif | |
2880 | rs_build_rates_table(mvm, lq_sta, initial_rate); | |
2881 | ||
2882 | if (num_of_ant(ant) == 1) | |
2883 | lq_cmd->single_stream_ant_msk = ant; | |
2884 | ||
2885 | lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; | |
2886 | lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF; | |
2887 | ||
2888 | lq_cmd->agg_time_limit = | |
2889 | cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF); | |
2890 | ||
2891 | if (sta) | |
2892 | lq_cmd->agg_time_limit = | |
2893 | cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); | |
2894 | } | |
2895 | ||
2896 | static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
2897 | { | |
2898 | return hw->priv; | |
2899 | } | |
2900 | /* rate scale requires free function to be implemented */ | |
2901 | static void rs_free(void *mvm_rate) | |
2902 | { | |
2903 | return; | |
2904 | } | |
2905 | ||
2906 | static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, | |
2907 | void *mvm_sta) | |
2908 | { | |
2909 | struct iwl_op_mode *op_mode __maybe_unused = mvm_r; | |
2910 | struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); | |
2911 | ||
2912 | IWL_DEBUG_RATE(mvm, "enter\n"); | |
2913 | IWL_DEBUG_RATE(mvm, "leave\n"); | |
2914 | } | |
2915 | ||
2916 | #ifdef CONFIG_MAC80211_DEBUGFS | |
2917 | int rs_pretty_print_rate(char *buf, const u32 rate) | |
2918 | { | |
2919 | ||
2920 | char *type, *bw; | |
2921 | u8 mcs = 0, nss = 0; | |
2922 | u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; | |
2923 | ||
2924 | if (!(rate & RATE_MCS_HT_MSK) && | |
2925 | !(rate & RATE_MCS_VHT_MSK)) { | |
2926 | int index = iwl_hwrate_to_plcp_idx(rate); | |
2927 | ||
2928 | return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", | |
2929 | rs_pretty_ant(ant), | |
2930 | index == IWL_RATE_INVALID ? "BAD" : | |
2931 | iwl_rate_mcs[index].mbps); | |
2932 | } | |
2933 | ||
2934 | if (rate & RATE_MCS_VHT_MSK) { | |
2935 | type = "VHT"; | |
2936 | mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; | |
2937 | nss = ((rate & RATE_VHT_MCS_NSS_MSK) | |
2938 | >> RATE_VHT_MCS_NSS_POS) + 1; | |
2939 | } else if (rate & RATE_MCS_HT_MSK) { | |
2940 | type = "HT"; | |
2941 | mcs = rate & RATE_HT_MCS_INDEX_MSK; | |
2942 | } else { | |
2943 | type = "Unknown"; /* shouldn't happen */ | |
2944 | } | |
2945 | ||
2946 | switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { | |
2947 | case RATE_MCS_CHAN_WIDTH_20: | |
2948 | bw = "20Mhz"; | |
2949 | break; | |
2950 | case RATE_MCS_CHAN_WIDTH_40: | |
2951 | bw = "40Mhz"; | |
2952 | break; | |
2953 | case RATE_MCS_CHAN_WIDTH_80: | |
2954 | bw = "80Mhz"; | |
2955 | break; | |
2956 | case RATE_MCS_CHAN_WIDTH_160: | |
2957 | bw = "160Mhz"; | |
2958 | break; | |
2959 | default: | |
2960 | bw = "BAD BW"; | |
2961 | } | |
2962 | ||
2963 | return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n", | |
2964 | type, rs_pretty_ant(ant), bw, mcs, nss, | |
2965 | (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", | |
2966 | (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "", | |
2967 | (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", | |
2968 | (rate & RATE_MCS_BF_MSK) ? "BF " : "", | |
2969 | (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : ""); | |
2970 | } | |
2971 | ||
2972 | /** | |
2973 | * Program the device to use fixed rate for frame transmit | |
2974 | * This is for debugging/testing only | |
2975 | * once the device start use fixed rate, we need to reload the module | |
2976 | * to being back the normal operation. | |
2977 | */ | |
2978 | static void rs_program_fix_rate(struct iwl_mvm *mvm, | |
2979 | struct iwl_lq_sta *lq_sta) | |
2980 | { | |
2981 | lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ | |
2982 | lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ | |
2983 | lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ | |
2984 | ||
2985 | IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", | |
2986 | lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); | |
2987 | ||
2988 | if (lq_sta->dbg_fixed_rate) { | |
2989 | struct rs_rate rate; | |
2990 | rs_rate_from_ucode_rate(lq_sta->dbg_fixed_rate, | |
2991 | lq_sta->band, &rate); | |
2992 | rs_fill_lq_cmd(mvm, NULL, lq_sta, &rate); | |
2993 | iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false); | |
2994 | } | |
2995 | } | |
2996 | ||
2997 | static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, | |
2998 | const char __user *user_buf, size_t count, loff_t *ppos) | |
2999 | { | |
3000 | struct iwl_lq_sta *lq_sta = file->private_data; | |
3001 | struct iwl_mvm *mvm; | |
3002 | char buf[64]; | |
3003 | size_t buf_size; | |
3004 | u32 parsed_rate; | |
3005 | ||
3006 | mvm = lq_sta->drv; | |
3007 | memset(buf, 0, sizeof(buf)); | |
3008 | buf_size = min(count, sizeof(buf) - 1); | |
3009 | if (copy_from_user(buf, user_buf, buf_size)) | |
3010 | return -EFAULT; | |
3011 | ||
3012 | if (sscanf(buf, "%x", &parsed_rate) == 1) | |
3013 | lq_sta->dbg_fixed_rate = parsed_rate; | |
3014 | else | |
3015 | lq_sta->dbg_fixed_rate = 0; | |
3016 | ||
3017 | rs_program_fix_rate(mvm, lq_sta); | |
3018 | ||
3019 | return count; | |
3020 | } | |
3021 | ||
3022 | static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, | |
3023 | char __user *user_buf, size_t count, loff_t *ppos) | |
3024 | { | |
3025 | char *buff; | |
3026 | int desc = 0; | |
3027 | int i = 0; | |
3028 | ssize_t ret; | |
3029 | ||
3030 | struct iwl_lq_sta *lq_sta = file->private_data; | |
3031 | struct iwl_mvm *mvm; | |
3032 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); | |
3033 | struct rs_rate *rate = &tbl->rate; | |
3034 | mvm = lq_sta->drv; | |
3035 | buff = kmalloc(2048, GFP_KERNEL); | |
3036 | if (!buff) | |
3037 | return -ENOMEM; | |
3038 | ||
3039 | desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); | |
3040 | desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", | |
3041 | lq_sta->total_failed, lq_sta->total_success, | |
3042 | lq_sta->active_legacy_rate); | |
3043 | desc += sprintf(buff+desc, "fixed rate 0x%X\n", | |
3044 | lq_sta->dbg_fixed_rate); | |
3045 | desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", | |
3046 | (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "", | |
3047 | (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "", | |
3048 | (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : ""); | |
3049 | desc += sprintf(buff+desc, "lq type %s\n", | |
3050 | (is_legacy(rate)) ? "legacy" : | |
3051 | is_vht(rate) ? "VHT" : "HT"); | |
3052 | if (!is_legacy(rate)) { | |
3053 | desc += sprintf(buff+desc, " %s", | |
3054 | (is_siso(rate)) ? "SISO" : "MIMO2"); | |
3055 | desc += sprintf(buff+desc, " %s", | |
3056 | (is_ht20(rate)) ? "20MHz" : | |
3057 | (is_ht40(rate)) ? "40MHz" : | |
3058 | (is_ht80(rate)) ? "80Mhz" : "BAD BW"); | |
3059 | desc += sprintf(buff+desc, " %s %s\n", | |
3060 | (rate->sgi) ? "SGI" : "NGI", | |
3061 | (lq_sta->is_agg) ? "AGG on" : ""); | |
3062 | } | |
3063 | desc += sprintf(buff+desc, "last tx rate=0x%X\n", | |
3064 | lq_sta->last_rate_n_flags); | |
3065 | desc += sprintf(buff+desc, | |
3066 | "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", | |
3067 | lq_sta->lq.flags, | |
3068 | lq_sta->lq.mimo_delim, | |
3069 | lq_sta->lq.single_stream_ant_msk, | |
3070 | lq_sta->lq.dual_stream_ant_msk); | |
3071 | ||
3072 | desc += sprintf(buff+desc, | |
3073 | "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", | |
3074 | le16_to_cpu(lq_sta->lq.agg_time_limit), | |
3075 | lq_sta->lq.agg_disable_start_th, | |
3076 | lq_sta->lq.agg_frame_cnt_limit); | |
3077 | ||
3078 | desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); | |
3079 | desc += sprintf(buff+desc, | |
3080 | "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", | |
3081 | lq_sta->lq.initial_rate_index[0], | |
3082 | lq_sta->lq.initial_rate_index[1], | |
3083 | lq_sta->lq.initial_rate_index[2], | |
3084 | lq_sta->lq.initial_rate_index[3]); | |
3085 | ||
3086 | for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { | |
3087 | u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); | |
3088 | ||
3089 | desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); | |
3090 | desc += rs_pretty_print_rate(buff+desc, r); | |
3091 | } | |
3092 | ||
3093 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
3094 | kfree(buff); | |
3095 | return ret; | |
3096 | } | |
3097 | ||
3098 | static const struct file_operations rs_sta_dbgfs_scale_table_ops = { | |
3099 | .write = rs_sta_dbgfs_scale_table_write, | |
3100 | .read = rs_sta_dbgfs_scale_table_read, | |
3101 | .open = simple_open, | |
3102 | .llseek = default_llseek, | |
3103 | }; | |
3104 | static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, | |
3105 | char __user *user_buf, size_t count, loff_t *ppos) | |
3106 | { | |
3107 | char *buff; | |
3108 | int desc = 0; | |
3109 | int i, j; | |
3110 | ssize_t ret; | |
3111 | struct iwl_scale_tbl_info *tbl; | |
3112 | struct rs_rate *rate; | |
3113 | struct iwl_lq_sta *lq_sta = file->private_data; | |
3114 | ||
3115 | buff = kmalloc(1024, GFP_KERNEL); | |
3116 | if (!buff) | |
3117 | return -ENOMEM; | |
3118 | ||
3119 | for (i = 0; i < LQ_SIZE; i++) { | |
3120 | tbl = &(lq_sta->lq_info[i]); | |
3121 | rate = &tbl->rate; | |
3122 | desc += sprintf(buff+desc, | |
3123 | "%s type=%d SGI=%d BW=%s DUP=0\n" | |
3124 | "index=%d\n", | |
3125 | lq_sta->active_tbl == i ? "*" : "x", | |
3126 | rate->type, | |
3127 | rate->sgi, | |
3128 | is_ht20(rate) ? "20Mhz" : | |
3129 | is_ht40(rate) ? "40Mhz" : | |
3130 | is_ht80(rate) ? "80Mhz" : "ERR", | |
3131 | rate->index); | |
3132 | for (j = 0; j < IWL_RATE_COUNT; j++) { | |
3133 | desc += sprintf(buff+desc, | |
3134 | "counter=%d success=%d %%=%d\n", | |
3135 | tbl->win[j].counter, | |
3136 | tbl->win[j].success_counter, | |
3137 | tbl->win[j].success_ratio); | |
3138 | } | |
3139 | } | |
3140 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
3141 | kfree(buff); | |
3142 | return ret; | |
3143 | } | |
3144 | ||
3145 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
3146 | .read = rs_sta_dbgfs_stats_table_read, | |
3147 | .open = simple_open, | |
3148 | .llseek = default_llseek, | |
3149 | }; | |
3150 | ||
3151 | static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, | |
3152 | char __user *user_buf, | |
3153 | size_t count, loff_t *ppos) | |
3154 | { | |
3155 | static const char * const column_name[] = { | |
3156 | [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", | |
3157 | [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", | |
3158 | [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", | |
3159 | [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", | |
3160 | [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", | |
3161 | [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", | |
3162 | [RS_COLUMN_MIMO2] = "MIMO2", | |
3163 | [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", | |
3164 | }; | |
3165 | ||
3166 | static const char * const rate_name[] = { | |
3167 | [IWL_RATE_1M_INDEX] = "1M", | |
3168 | [IWL_RATE_2M_INDEX] = "2M", | |
3169 | [IWL_RATE_5M_INDEX] = "5.5M", | |
3170 | [IWL_RATE_11M_INDEX] = "11M", | |
3171 | [IWL_RATE_6M_INDEX] = "6M|MCS0", | |
3172 | [IWL_RATE_9M_INDEX] = "9M", | |
3173 | [IWL_RATE_12M_INDEX] = "12M|MCS1", | |
3174 | [IWL_RATE_18M_INDEX] = "18M|MCS2", | |
3175 | [IWL_RATE_24M_INDEX] = "24M|MCS3", | |
3176 | [IWL_RATE_36M_INDEX] = "36M|MCS4", | |
3177 | [IWL_RATE_48M_INDEX] = "48M|MCS5", | |
3178 | [IWL_RATE_54M_INDEX] = "54M|MCS6", | |
3179 | [IWL_RATE_MCS_7_INDEX] = "MCS7", | |
3180 | [IWL_RATE_MCS_8_INDEX] = "MCS8", | |
3181 | [IWL_RATE_MCS_9_INDEX] = "MCS9", | |
3182 | }; | |
3183 | ||
3184 | char *buff, *pos, *endpos; | |
3185 | int col, rate; | |
3186 | ssize_t ret; | |
3187 | struct iwl_lq_sta *lq_sta = file->private_data; | |
3188 | struct rs_rate_stats *stats; | |
3189 | static const size_t bufsz = 1024; | |
3190 | ||
3191 | buff = kmalloc(bufsz, GFP_KERNEL); | |
3192 | if (!buff) | |
3193 | return -ENOMEM; | |
3194 | ||
3195 | pos = buff; | |
3196 | endpos = pos + bufsz; | |
3197 | ||
3198 | pos += scnprintf(pos, endpos - pos, "COLUMN,"); | |
3199 | for (rate = 0; rate < IWL_RATE_COUNT; rate++) | |
3200 | pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); | |
3201 | pos += scnprintf(pos, endpos - pos, "\n"); | |
3202 | ||
3203 | for (col = 0; col < RS_COLUMN_COUNT; col++) { | |
3204 | pos += scnprintf(pos, endpos - pos, | |
3205 | "%s,", column_name[col]); | |
3206 | ||
3207 | for (rate = 0; rate < IWL_RATE_COUNT; rate++) { | |
3208 | stats = &(lq_sta->tx_stats[col][rate]); | |
3209 | pos += scnprintf(pos, endpos - pos, | |
3210 | "%llu/%llu,", | |
3211 | stats->success, | |
3212 | stats->total); | |
3213 | } | |
3214 | pos += scnprintf(pos, endpos - pos, "\n"); | |
3215 | } | |
3216 | ||
3217 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); | |
3218 | kfree(buff); | |
3219 | return ret; | |
3220 | } | |
3221 | ||
3222 | static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, | |
3223 | const char __user *user_buf, | |
3224 | size_t count, loff_t *ppos) | |
3225 | { | |
3226 | struct iwl_lq_sta *lq_sta = file->private_data; | |
3227 | memset(lq_sta->tx_stats, 0, sizeof(lq_sta->tx_stats)); | |
3228 | ||
3229 | return count; | |
3230 | } | |
3231 | ||
3232 | static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { | |
3233 | .read = rs_sta_dbgfs_drv_tx_stats_read, | |
3234 | .write = rs_sta_dbgfs_drv_tx_stats_write, | |
3235 | .open = simple_open, | |
3236 | .llseek = default_llseek, | |
3237 | }; | |
3238 | ||
3239 | static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir) | |
3240 | { | |
3241 | struct iwl_lq_sta *lq_sta = mvm_sta; | |
3242 | lq_sta->rs_sta_dbgfs_scale_table_file = | |
3243 | debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, | |
3244 | lq_sta, &rs_sta_dbgfs_scale_table_ops); | |
3245 | lq_sta->rs_sta_dbgfs_stats_table_file = | |
3246 | debugfs_create_file("rate_stats_table", S_IRUSR, dir, | |
3247 | lq_sta, &rs_sta_dbgfs_stats_table_ops); | |
3248 | lq_sta->rs_sta_dbgfs_drv_tx_stats_file = | |
3249 | debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, | |
3250 | lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); | |
3251 | lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file = | |
3252 | debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, | |
3253 | &lq_sta->tx_agg_tid_en); | |
3254 | lq_sta->rs_sta_dbgfs_reduced_txp_file = | |
3255 | debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, | |
3256 | &lq_sta->dbg_fixed_txp_reduction); | |
3257 | } | |
3258 | ||
3259 | static void rs_remove_debugfs(void *mvm, void *mvm_sta) | |
3260 | { | |
3261 | struct iwl_lq_sta *lq_sta = mvm_sta; | |
3262 | debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file); | |
3263 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); | |
3264 | debugfs_remove(lq_sta->rs_sta_dbgfs_drv_tx_stats_file); | |
3265 | debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); | |
3266 | debugfs_remove(lq_sta->rs_sta_dbgfs_reduced_txp_file); | |
3267 | } | |
3268 | #endif | |
3269 | ||
3270 | /* | |
3271 | * Initialization of rate scaling information is done by driver after | |
3272 | * the station is added. Since mac80211 calls this function before a | |
3273 | * station is added we ignore it. | |
3274 | */ | |
3275 | static void rs_rate_init_stub(void *mvm_r, | |
3276 | struct ieee80211_supported_band *sband, | |
3277 | struct cfg80211_chan_def *chandef, | |
3278 | struct ieee80211_sta *sta, void *mvm_sta) | |
3279 | { | |
3280 | } | |
3281 | ||
3282 | static const struct rate_control_ops rs_mvm_ops = { | |
3283 | .name = RS_NAME, | |
3284 | .tx_status = rs_tx_status, | |
3285 | .get_rate = rs_get_rate, | |
3286 | .rate_init = rs_rate_init_stub, | |
3287 | .alloc = rs_alloc, | |
3288 | .free = rs_free, | |
3289 | .alloc_sta = rs_alloc_sta, | |
3290 | .free_sta = rs_free_sta, | |
3291 | .rate_update = rs_rate_update, | |
3292 | #ifdef CONFIG_MAC80211_DEBUGFS | |
3293 | .add_sta_debugfs = rs_add_debugfs, | |
3294 | .remove_sta_debugfs = rs_remove_debugfs, | |
3295 | #endif | |
3296 | }; | |
3297 | ||
3298 | int iwl_mvm_rate_control_register(void) | |
3299 | { | |
3300 | return ieee80211_rate_control_register(&rs_mvm_ops); | |
3301 | } | |
3302 | ||
3303 | void iwl_mvm_rate_control_unregister(void) | |
3304 | { | |
3305 | ieee80211_rate_control_unregister(&rs_mvm_ops); | |
3306 | } | |
3307 | ||
3308 | /** | |
3309 | * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable | |
3310 | * Tx protection, according to this rquest and previous requests, | |
3311 | * and send the LQ command. | |
3312 | * @mvmsta: The station | |
3313 | * @enable: Enable Tx protection? | |
3314 | */ | |
3315 | int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, | |
3316 | bool enable) | |
3317 | { | |
3318 | struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; | |
3319 | ||
3320 | lockdep_assert_held(&mvm->mutex); | |
3321 | ||
3322 | if (enable) { | |
3323 | if (mvmsta->tx_protection == 0) | |
3324 | lq->flags |= LQ_FLAG_USE_RTS_MSK; | |
3325 | mvmsta->tx_protection++; | |
3326 | } else { | |
3327 | mvmsta->tx_protection--; | |
3328 | if (mvmsta->tx_protection == 0) | |
3329 | lq->flags &= ~LQ_FLAG_USE_RTS_MSK; | |
3330 | } | |
3331 | ||
3332 | return iwl_mvm_send_lq_cmd(mvm, lq, false); | |
3333 | } |