1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3  *
4  * Copyright(c) 2005 - 2014, 2018 - 2021 Intel Corporation. All rights reserved.
5  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
6  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
7  *****************************************************************************/
8 #include <linux/kernel.h>
9 #include <linux/skbuff.h>
10 #include <linux/slab.h>
11 #include <net/mac80211.h>
12 
13 #include <linux/netdevice.h>
14 #include <linux/etherdevice.h>
15 #include <linux/delay.h>
16 
17 #include <linux/workqueue.h>
18 #include "rs.h"
19 #include "fw-api.h"
20 #include "sta.h"
21 #include "iwl-op-mode.h"
22 #include "mvm.h"
23 #include "debugfs.h"
24 
25 #define IWL_RATE_MAX_WINDOW		62	/* # tx in history window */
26 
27 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
28  * Use this macro when dealing with thresholds consts set as a percentage
29  */
30 #define RS_PERCENT(x) (128 * x)
31 
32 static u8 rs_ht_to_legacy[] = {
33 	[IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
34 	[IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
35 	[IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
36 	[IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
37 	[IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
38 	[IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
39 	[IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
40 	[IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
41 	[IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
42 	[IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
43 };
44 
45 static const u8 ant_toggle_lookup[] = {
46 	[ANT_NONE] = ANT_NONE,
47 	[ANT_A] = ANT_B,
48 	[ANT_B] = ANT_A,
49 	[ANT_AB] = ANT_AB,
50 };
51 
52 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)			      \
53 	[IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,	      \
54 				    IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
55 				    IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
56 				    IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
57 				    IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
58 				    IWL_RATE_##rp##M_INDEX,	      \
59 				    IWL_RATE_##rn##M_INDEX }
60 
61 #define IWL_DECLARE_MCS_RATE(s)						  \
62 	[IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,		  \
63 				       IWL_RATE_HT_SISO_MCS_##s##_PLCP,	  \
64 				       IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
65 				       IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
66 				       IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
67 				       IWL_RATE_INVM_INDEX,	          \
68 				       IWL_RATE_INVM_INDEX }
69 
70 /*
71  * Parameter order:
72  *   rate, ht rate, prev rate, next rate
73  *
74  * If there isn't a valid next or previous rate then INV is used which
75  * maps to IWL_RATE_INVALID
76  *
77  */
78 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
79 	IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
80 	IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
81 	IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
82 	IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
83 	IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
84 	IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
85 	IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
86 	IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
87 	IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
88 	IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
89 	IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
90 	IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
91 	IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
92 	IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
93 	IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
94 };
95 
96 enum rs_action {
97 	RS_ACTION_STAY = 0,
98 	RS_ACTION_DOWNSCALE = -1,
99 	RS_ACTION_UPSCALE = 1,
100 };
101 
102 enum rs_column_mode {
103 	RS_INVALID = 0,
104 	RS_LEGACY,
105 	RS_SISO,
106 	RS_MIMO2,
107 };
108 
109 #define MAX_NEXT_COLUMNS 7
110 #define MAX_COLUMN_CHECKS 3
111 
112 struct rs_tx_column;
113 
114 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
115 				     struct ieee80211_sta *sta,
116 				     struct rs_rate *rate,
117 				     const struct rs_tx_column *next_col);
118 
119 struct rs_tx_column {
120 	enum rs_column_mode mode;
121 	u8 ant;
122 	bool sgi;
123 	enum rs_column next_columns[MAX_NEXT_COLUMNS];
124 	allow_column_func_t checks[MAX_COLUMN_CHECKS];
125 };
126 
rs_ant_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)127 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
128 			 struct rs_rate *rate,
129 			 const struct rs_tx_column *next_col)
130 {
131 	return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
132 }
133 
rs_mimo_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)134 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
135 			  struct rs_rate *rate,
136 			  const struct rs_tx_column *next_col)
137 {
138 	if (!sta->deflink.ht_cap.ht_supported)
139 		return false;
140 
141 	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
142 		return false;
143 
144 	if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
145 		return false;
146 
147 	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
148 		return false;
149 
150 	if (mvm->nvm_data->sku_cap_mimo_disabled)
151 		return false;
152 
153 	return true;
154 }
155 
rs_siso_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)156 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
157 			  struct rs_rate *rate,
158 			  const struct rs_tx_column *next_col)
159 {
160 	if (!sta->deflink.ht_cap.ht_supported)
161 		return false;
162 
163 	return true;
164 }
165 
rs_sgi_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)166 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
167 			 struct rs_rate *rate,
168 			 const struct rs_tx_column *next_col)
169 {
170 	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
171 	struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
172 
173 	if (is_ht20(rate) && (ht_cap->cap &
174 			     IEEE80211_HT_CAP_SGI_20))
175 		return true;
176 	if (is_ht40(rate) && (ht_cap->cap &
177 			     IEEE80211_HT_CAP_SGI_40))
178 		return true;
179 	if (is_ht80(rate) && (vht_cap->cap &
180 			     IEEE80211_VHT_CAP_SHORT_GI_80))
181 		return true;
182 	if (is_ht160(rate) && (vht_cap->cap &
183 			     IEEE80211_VHT_CAP_SHORT_GI_160))
184 		return true;
185 
186 	return false;
187 }
188 
189 static const struct rs_tx_column rs_tx_columns[] = {
190 	[RS_COLUMN_LEGACY_ANT_A] = {
191 		.mode = RS_LEGACY,
192 		.ant = ANT_A,
193 		.next_columns = {
194 			RS_COLUMN_LEGACY_ANT_B,
195 			RS_COLUMN_SISO_ANT_A,
196 			RS_COLUMN_MIMO2,
197 			RS_COLUMN_INVALID,
198 			RS_COLUMN_INVALID,
199 			RS_COLUMN_INVALID,
200 			RS_COLUMN_INVALID,
201 		},
202 		.checks = {
203 			rs_ant_allow,
204 		},
205 	},
206 	[RS_COLUMN_LEGACY_ANT_B] = {
207 		.mode = RS_LEGACY,
208 		.ant = ANT_B,
209 		.next_columns = {
210 			RS_COLUMN_LEGACY_ANT_A,
211 			RS_COLUMN_SISO_ANT_B,
212 			RS_COLUMN_MIMO2,
213 			RS_COLUMN_INVALID,
214 			RS_COLUMN_INVALID,
215 			RS_COLUMN_INVALID,
216 			RS_COLUMN_INVALID,
217 		},
218 		.checks = {
219 			rs_ant_allow,
220 		},
221 	},
222 	[RS_COLUMN_SISO_ANT_A] = {
223 		.mode = RS_SISO,
224 		.ant = ANT_A,
225 		.next_columns = {
226 			RS_COLUMN_SISO_ANT_B,
227 			RS_COLUMN_MIMO2,
228 			RS_COLUMN_SISO_ANT_A_SGI,
229 			RS_COLUMN_LEGACY_ANT_A,
230 			RS_COLUMN_LEGACY_ANT_B,
231 			RS_COLUMN_INVALID,
232 			RS_COLUMN_INVALID,
233 		},
234 		.checks = {
235 			rs_siso_allow,
236 			rs_ant_allow,
237 		},
238 	},
239 	[RS_COLUMN_SISO_ANT_B] = {
240 		.mode = RS_SISO,
241 		.ant = ANT_B,
242 		.next_columns = {
243 			RS_COLUMN_SISO_ANT_A,
244 			RS_COLUMN_MIMO2,
245 			RS_COLUMN_SISO_ANT_B_SGI,
246 			RS_COLUMN_LEGACY_ANT_A,
247 			RS_COLUMN_LEGACY_ANT_B,
248 			RS_COLUMN_INVALID,
249 			RS_COLUMN_INVALID,
250 		},
251 		.checks = {
252 			rs_siso_allow,
253 			rs_ant_allow,
254 		},
255 	},
256 	[RS_COLUMN_SISO_ANT_A_SGI] = {
257 		.mode = RS_SISO,
258 		.ant = ANT_A,
259 		.sgi = true,
260 		.next_columns = {
261 			RS_COLUMN_SISO_ANT_B_SGI,
262 			RS_COLUMN_MIMO2_SGI,
263 			RS_COLUMN_SISO_ANT_A,
264 			RS_COLUMN_LEGACY_ANT_A,
265 			RS_COLUMN_LEGACY_ANT_B,
266 			RS_COLUMN_INVALID,
267 			RS_COLUMN_INVALID,
268 		},
269 		.checks = {
270 			rs_siso_allow,
271 			rs_ant_allow,
272 			rs_sgi_allow,
273 		},
274 	},
275 	[RS_COLUMN_SISO_ANT_B_SGI] = {
276 		.mode = RS_SISO,
277 		.ant = ANT_B,
278 		.sgi = true,
279 		.next_columns = {
280 			RS_COLUMN_SISO_ANT_A_SGI,
281 			RS_COLUMN_MIMO2_SGI,
282 			RS_COLUMN_SISO_ANT_B,
283 			RS_COLUMN_LEGACY_ANT_A,
284 			RS_COLUMN_LEGACY_ANT_B,
285 			RS_COLUMN_INVALID,
286 			RS_COLUMN_INVALID,
287 		},
288 		.checks = {
289 			rs_siso_allow,
290 			rs_ant_allow,
291 			rs_sgi_allow,
292 		},
293 	},
294 	[RS_COLUMN_MIMO2] = {
295 		.mode = RS_MIMO2,
296 		.ant = ANT_AB,
297 		.next_columns = {
298 			RS_COLUMN_SISO_ANT_A,
299 			RS_COLUMN_MIMO2_SGI,
300 			RS_COLUMN_LEGACY_ANT_A,
301 			RS_COLUMN_LEGACY_ANT_B,
302 			RS_COLUMN_INVALID,
303 			RS_COLUMN_INVALID,
304 			RS_COLUMN_INVALID,
305 		},
306 		.checks = {
307 			rs_mimo_allow,
308 		},
309 	},
310 	[RS_COLUMN_MIMO2_SGI] = {
311 		.mode = RS_MIMO2,
312 		.ant = ANT_AB,
313 		.sgi = true,
314 		.next_columns = {
315 			RS_COLUMN_SISO_ANT_A_SGI,
316 			RS_COLUMN_MIMO2,
317 			RS_COLUMN_LEGACY_ANT_A,
318 			RS_COLUMN_LEGACY_ANT_B,
319 			RS_COLUMN_INVALID,
320 			RS_COLUMN_INVALID,
321 			RS_COLUMN_INVALID,
322 		},
323 		.checks = {
324 			rs_mimo_allow,
325 			rs_sgi_allow,
326 		},
327 	},
328 };
329 
rs_extract_rate(u32 rate_n_flags)330 static inline u8 rs_extract_rate(u32 rate_n_flags)
331 {
332 	/* also works for HT because bits 7:6 are zero there */
333 	return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK_V1);
334 }
335 
iwl_hwrate_to_plcp_idx(u32 rate_n_flags)336 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
337 {
338 	int idx = 0;
339 
340 	if (rate_n_flags & RATE_MCS_HT_MSK_V1) {
341 		idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK_V1;
342 		idx += IWL_RATE_MCS_0_INDEX;
343 
344 		/* skip 9M not supported in HT*/
345 		if (idx >= IWL_RATE_9M_INDEX)
346 			idx += 1;
347 		if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
348 			return idx;
349 	} else if (rate_n_flags & RATE_MCS_VHT_MSK_V1 ||
350 		   rate_n_flags & RATE_MCS_HE_MSK_V1) {
351 		idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
352 		idx += IWL_RATE_MCS_0_INDEX;
353 
354 		/* skip 9M not supported in VHT*/
355 		if (idx >= IWL_RATE_9M_INDEX)
356 			idx++;
357 		if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
358 			return idx;
359 		if ((rate_n_flags & RATE_MCS_HE_MSK_V1) &&
360 		    idx <= IWL_LAST_HE_RATE)
361 			return idx;
362 	} else {
363 		/* legacy rate format, search for match in table */
364 
365 		u8 legacy_rate = rs_extract_rate(rate_n_flags);
366 		for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
367 			if (iwl_rates[idx].plcp == legacy_rate)
368 				return idx;
369 	}
370 
371 	return IWL_RATE_INVALID;
372 }
373 
374 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
375 				  struct ieee80211_sta *sta,
376 				  struct iwl_lq_sta *lq_sta,
377 				  int tid, bool ndp);
378 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
379 			   struct ieee80211_sta *sta,
380 			   struct iwl_lq_sta *lq_sta,
381 			   const struct rs_rate *initial_rate);
382 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
383 
384 /*
385  * The following tables contain the expected throughput metrics for all rates
386  *
387  *	1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
388  *
389  * where invalid entries are zeros.
390  *
391  * CCK rates are only valid in legacy table and will only be used in G
392  * (2.4 GHz) band.
393  */
394 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
395 	7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
396 };
397 
398 /* Expected TpT tables. 4 indexes:
399  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
400  */
401 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
402 	{0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
403 	{0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
404 	{0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
405 	{0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
406 };
407 
408 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
409 	{0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
410 	{0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
411 	{0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
412 	{0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
413 };
414 
415 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
416 	{0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
417 	{0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
418 	{0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
419 	{0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
420 };
421 
422 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
423 	{0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
424 	{0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
425 	{0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
426 	{0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
427 };
428 
429 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
430 	{0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
431 	{0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
432 	{0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
433 	{0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
434 };
435 
436 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
437 	{0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
438 	{0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
439 	{0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
440 	{0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
441 };
442 
443 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
444 	{0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
445 	{0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
446 	{0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
447 	{0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
448 };
449 
450 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
451 	{0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
452 	{0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
453 	{0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
454 	{0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
455 };
456 
rs_pretty_lq_type(enum iwl_table_type type)457 static const char *rs_pretty_lq_type(enum iwl_table_type type)
458 {
459 	static const char * const lq_types[] = {
460 		[LQ_NONE] = "NONE",
461 		[LQ_LEGACY_A] = "LEGACY_A",
462 		[LQ_LEGACY_G] = "LEGACY_G",
463 		[LQ_HT_SISO] = "HT SISO",
464 		[LQ_HT_MIMO2] = "HT MIMO",
465 		[LQ_VHT_SISO] = "VHT SISO",
466 		[LQ_VHT_MIMO2] = "VHT MIMO",
467 		[LQ_HE_SISO] = "HE SISO",
468 		[LQ_HE_MIMO2] = "HE MIMO",
469 	};
470 
471 	if (type < LQ_NONE || type >= LQ_MAX)
472 		return "UNKNOWN";
473 
474 	return lq_types[type];
475 }
476 
rs_pretty_rate(const struct rs_rate * rate)477 static char *rs_pretty_rate(const struct rs_rate *rate)
478 {
479 	static char buf[40];
480 	static const char * const legacy_rates[] = {
481 		[IWL_RATE_1M_INDEX] = "1M",
482 		[IWL_RATE_2M_INDEX] = "2M",
483 		[IWL_RATE_5M_INDEX] = "5.5M",
484 		[IWL_RATE_11M_INDEX] = "11M",
485 		[IWL_RATE_6M_INDEX] = "6M",
486 		[IWL_RATE_9M_INDEX] = "9M",
487 		[IWL_RATE_12M_INDEX] = "12M",
488 		[IWL_RATE_18M_INDEX] = "18M",
489 		[IWL_RATE_24M_INDEX] = "24M",
490 		[IWL_RATE_36M_INDEX] = "36M",
491 		[IWL_RATE_48M_INDEX] = "48M",
492 		[IWL_RATE_54M_INDEX] = "54M",
493 	};
494 	static const char *const ht_vht_rates[] = {
495 		[IWL_RATE_MCS_0_INDEX] = "MCS0",
496 		[IWL_RATE_MCS_1_INDEX] = "MCS1",
497 		[IWL_RATE_MCS_2_INDEX] = "MCS2",
498 		[IWL_RATE_MCS_3_INDEX] = "MCS3",
499 		[IWL_RATE_MCS_4_INDEX] = "MCS4",
500 		[IWL_RATE_MCS_5_INDEX] = "MCS5",
501 		[IWL_RATE_MCS_6_INDEX] = "MCS6",
502 		[IWL_RATE_MCS_7_INDEX] = "MCS7",
503 		[IWL_RATE_MCS_8_INDEX] = "MCS8",
504 		[IWL_RATE_MCS_9_INDEX] = "MCS9",
505 	};
506 	const char *rate_str;
507 
508 	if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
509 		rate_str = legacy_rates[rate->index];
510 	else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
511 		 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
512 		 (rate->index <= IWL_RATE_MCS_9_INDEX))
513 		rate_str = ht_vht_rates[rate->index];
514 	else
515 		rate_str = "BAD_RATE";
516 
517 	sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
518 		iwl_rs_pretty_ant(rate->ant), rate_str);
519 	return buf;
520 }
521 
rs_dump_rate(struct iwl_mvm * mvm,const struct rs_rate * rate,const char * prefix)522 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
523 				const char *prefix)
524 {
525 	IWL_DEBUG_RATE(mvm,
526 		       "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
527 		       prefix, rs_pretty_rate(rate), rate->bw,
528 		       rate->sgi, rate->ldpc, rate->stbc);
529 }
530 
rs_rate_scale_clear_window(struct iwl_rate_scale_data * window)531 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
532 {
533 	window->data = 0;
534 	window->success_counter = 0;
535 	window->success_ratio = IWL_INVALID_VALUE;
536 	window->counter = 0;
537 	window->average_tpt = IWL_INVALID_VALUE;
538 }
539 
rs_rate_scale_clear_tbl_windows(struct iwl_mvm * mvm,struct iwl_scale_tbl_info * tbl)540 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
541 					    struct iwl_scale_tbl_info *tbl)
542 {
543 	int i;
544 
545 	IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
546 	for (i = 0; i < IWL_RATE_COUNT; i++)
547 		rs_rate_scale_clear_window(&tbl->win[i]);
548 
549 	for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
550 		rs_rate_scale_clear_window(&tbl->tpc_win[i]);
551 }
552 
rs_is_valid_ant(u8 valid_antenna,u8 ant_type)553 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
554 {
555 	return (ant_type & valid_antenna) == ant_type;
556 }
557 
rs_tl_turn_on_agg_for_tid(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_data,u8 tid,struct ieee80211_sta * sta)558 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
559 				     struct iwl_lq_sta *lq_data, u8 tid,
560 				     struct ieee80211_sta *sta)
561 {
562 	int ret;
563 
564 	IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
565 		     sta->addr, tid);
566 
567 	/* start BA session until the peer sends del BA */
568 	ret = ieee80211_start_tx_ba_session(sta, tid, 0);
569 	if (ret == -EAGAIN) {
570 		/*
571 		 * driver and mac80211 is out of sync
572 		 * this might be cause by reloading firmware
573 		 * stop the tx ba session here
574 		 */
575 		IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
576 			tid);
577 		ieee80211_stop_tx_ba_session(sta, tid);
578 	}
579 	return ret;
580 }
581 
rs_tl_turn_on_agg(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,u8 tid,struct iwl_lq_sta * lq_sta,struct ieee80211_sta * sta)582 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
583 			      u8 tid, struct iwl_lq_sta *lq_sta,
584 			      struct ieee80211_sta *sta)
585 {
586 	struct iwl_mvm_tid_data *tid_data;
587 
588 	/*
589 	 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
590 	 * when the frame is not QoS
591 	 */
592 	if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
593 		IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
594 			tid, IWL_MAX_TID_COUNT);
595 		return;
596 	} else if (tid == IWL_MAX_TID_COUNT) {
597 		return;
598 	}
599 
600 	tid_data = &mvmsta->tid_data[tid];
601 	if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
602 	    tid_data->state == IWL_AGG_OFF &&
603 	    (lq_sta->tx_agg_tid_en & BIT(tid)) &&
604 	    tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
605 		IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
606 		if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
607 			tid_data->state = IWL_AGG_QUEUED;
608 	}
609 }
610 
get_num_of_ant_from_rate(u32 rate_n_flags)611 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
612 {
613 	return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
614 	       !!(rate_n_flags & RATE_MCS_ANT_B_MSK);
615 }
616 
617 /*
618  * Static function to get the expected throughput from an iwl_scale_tbl_info
619  * that wraps a NULL pointer check
620  */
get_expected_tpt(struct iwl_scale_tbl_info * tbl,int rs_index)621 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
622 {
623 	if (tbl->expected_tpt)
624 		return tbl->expected_tpt[rs_index];
625 	return 0;
626 }
627 
628 /*
629  * rs_collect_tx_data - Update the success/failure sliding window
630  *
631  * We keep a sliding window of the last 62 packets transmitted
632  * at this rate.  window->data contains the bitmask of successful
633  * packets.
634  */
_rs_collect_tx_data(struct iwl_mvm * mvm,struct iwl_scale_tbl_info * tbl,int scale_index,int attempts,int successes,struct iwl_rate_scale_data * window)635 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
636 			       struct iwl_scale_tbl_info *tbl,
637 			       int scale_index, int attempts, int successes,
638 			       struct iwl_rate_scale_data *window)
639 {
640 	static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
641 	s32 fail_count, tpt;
642 
643 	/* Get expected throughput */
644 	tpt = get_expected_tpt(tbl, scale_index);
645 
646 	/*
647 	 * Keep track of only the latest 62 tx frame attempts in this rate's
648 	 * history window; anything older isn't really relevant any more.
649 	 * If we have filled up the sliding window, drop the oldest attempt;
650 	 * if the oldest attempt (highest bit in bitmap) shows "success",
651 	 * subtract "1" from the success counter (this is the main reason
652 	 * we keep these bitmaps!).
653 	 */
654 	while (attempts > 0) {
655 		if (window->counter >= IWL_RATE_MAX_WINDOW) {
656 			/* remove earliest */
657 			window->counter = IWL_RATE_MAX_WINDOW - 1;
658 
659 			if (window->data & mask) {
660 				window->data &= ~mask;
661 				window->success_counter--;
662 			}
663 		}
664 
665 		/* Increment frames-attempted counter */
666 		window->counter++;
667 
668 		/* Shift bitmap by one frame to throw away oldest history */
669 		window->data <<= 1;
670 
671 		/* Mark the most recent #successes attempts as successful */
672 		if (successes > 0) {
673 			window->success_counter++;
674 			window->data |= 0x1;
675 			successes--;
676 		}
677 
678 		attempts--;
679 	}
680 
681 	/* Calculate current success ratio, avoid divide-by-0! */
682 	if (window->counter > 0)
683 		window->success_ratio = 128 * (100 * window->success_counter)
684 					/ window->counter;
685 	else
686 		window->success_ratio = IWL_INVALID_VALUE;
687 
688 	fail_count = window->counter - window->success_counter;
689 
690 	/* Calculate average throughput, if we have enough history. */
691 	if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
692 	    (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
693 		window->average_tpt = (window->success_ratio * tpt + 64) / 128;
694 	else
695 		window->average_tpt = IWL_INVALID_VALUE;
696 
697 	return 0;
698 }
699 
rs_collect_tpc_data(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,int scale_index,int attempts,int successes,u8 reduced_txp)700 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
701 			       struct iwl_lq_sta *lq_sta,
702 			       struct iwl_scale_tbl_info *tbl,
703 			       int scale_index, int attempts, int successes,
704 			       u8 reduced_txp)
705 {
706 	struct iwl_rate_scale_data *window = NULL;
707 
708 	if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
709 		return -EINVAL;
710 
711 	window = &tbl->tpc_win[reduced_txp];
712 	return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
713 				    window);
714 }
715 
rs_update_tid_tpt_stats(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,u8 tid,int successes)716 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
717 				    struct iwl_mvm_sta *mvmsta,
718 				    u8 tid, int successes)
719 {
720 	struct iwl_mvm_tid_data *tid_data;
721 
722 	if (tid >= IWL_MAX_TID_COUNT)
723 		return;
724 
725 	tid_data = &mvmsta->tid_data[tid];
726 
727 	/*
728 	 * Measure if there're enough successful transmits per second.
729 	 * These statistics are used only to decide if we can start a
730 	 * BA session, so it should be updated only when A-MPDU is
731 	 * off.
732 	 */
733 	if (tid_data->state != IWL_AGG_OFF)
734 		return;
735 
736 	if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
737 	    (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
738 		tid_data->tx_count_last = tid_data->tx_count;
739 		tid_data->tx_count = 0;
740 		tid_data->tpt_meas_start = jiffies;
741 	} else {
742 		tid_data->tx_count += successes;
743 	}
744 }
745 
rs_collect_tlc_data(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,u8 tid,struct iwl_scale_tbl_info * tbl,int scale_index,int attempts,int successes)746 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
747 			       struct iwl_mvm_sta *mvmsta, u8 tid,
748 			       struct iwl_scale_tbl_info *tbl,
749 			       int scale_index, int attempts, int successes)
750 {
751 	struct iwl_rate_scale_data *window = NULL;
752 
753 	if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
754 		return -EINVAL;
755 
756 	if (tbl->column != RS_COLUMN_INVALID) {
757 		struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
758 
759 		pers->tx_stats[tbl->column][scale_index].total += attempts;
760 		pers->tx_stats[tbl->column][scale_index].success += successes;
761 	}
762 
763 	rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
764 
765 	/* Select window for current tx bit rate */
766 	window = &(tbl->win[scale_index]);
767 	return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
768 				   window);
769 }
770 
771 /* Convert rs_rate object into ucode rate bitmask */
ucode_rate_from_rs_rate(struct iwl_mvm * mvm,struct rs_rate * rate)772 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
773 				  struct rs_rate *rate)
774 {
775 	u32 ucode_rate = 0;
776 	int index = rate->index;
777 
778 	ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
779 			 RATE_MCS_ANT_AB_MSK);
780 
781 	if (is_legacy(rate)) {
782 		ucode_rate |= iwl_rates[index].plcp;
783 		if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
784 			ucode_rate |= RATE_MCS_CCK_MSK_V1;
785 		return ucode_rate;
786 	}
787 
788 	/* set RTS protection for all non legacy rates
789 	 * This helps with congested environments reducing the conflict cost to
790 	 * RTS retries only, instead of the entire BA packet.
791 	 */
792 	ucode_rate |= RATE_MCS_RTS_REQUIRED_MSK;
793 
794 	if (is_ht(rate)) {
795 		if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
796 			IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
797 			index = IWL_LAST_HT_RATE;
798 		}
799 		ucode_rate |= RATE_MCS_HT_MSK_V1;
800 
801 		if (is_ht_siso(rate))
802 			ucode_rate |= iwl_rates[index].plcp_ht_siso;
803 		else if (is_ht_mimo2(rate))
804 			ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
805 		else
806 			WARN_ON_ONCE(1);
807 	} else if (is_vht(rate)) {
808 		if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
809 			IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
810 			index = IWL_LAST_VHT_RATE;
811 		}
812 		ucode_rate |= RATE_MCS_VHT_MSK_V1;
813 		if (is_vht_siso(rate))
814 			ucode_rate |= iwl_rates[index].plcp_vht_siso;
815 		else if (is_vht_mimo2(rate))
816 			ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
817 		else
818 			WARN_ON_ONCE(1);
819 
820 	} else {
821 		IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
822 	}
823 
824 	if (is_siso(rate) && rate->stbc) {
825 		/* To enable STBC we need to set both a flag and ANT_AB */
826 		ucode_rate |= RATE_MCS_ANT_AB_MSK;
827 		ucode_rate |= RATE_MCS_STBC_MSK;
828 	}
829 
830 	ucode_rate |= rate->bw;
831 	if (rate->sgi)
832 		ucode_rate |= RATE_MCS_SGI_MSK_V1;
833 	if (rate->ldpc)
834 		ucode_rate |= RATE_MCS_LDPC_MSK_V1;
835 
836 	return ucode_rate;
837 }
838 
839 /* Convert a ucode rate into an rs_rate object */
rs_rate_from_ucode_rate(const u32 ucode_rate,enum nl80211_band band,struct rs_rate * rate)840 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
841 				   enum nl80211_band band,
842 				   struct rs_rate *rate)
843 {
844 	u32 ant_msk = ucode_rate & RATE_MCS_ANT_AB_MSK;
845 	u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
846 	u8 nss;
847 
848 	memset(rate, 0, sizeof(*rate));
849 	rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
850 
851 	if (rate->index == IWL_RATE_INVALID)
852 		return -EINVAL;
853 
854 	rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
855 
856 	/* Legacy */
857 	if (!(ucode_rate & RATE_MCS_HT_MSK_V1) &&
858 	    !(ucode_rate & RATE_MCS_VHT_MSK_V1) &&
859 	    !(ucode_rate & RATE_MCS_HE_MSK_V1)) {
860 		if (num_of_ant == 1) {
861 			if (band == NL80211_BAND_5GHZ)
862 				rate->type = LQ_LEGACY_A;
863 			else
864 				rate->type = LQ_LEGACY_G;
865 		}
866 
867 		return 0;
868 	}
869 
870 	/* HT, VHT or HE */
871 	if (ucode_rate & RATE_MCS_SGI_MSK_V1)
872 		rate->sgi = true;
873 	if (ucode_rate & RATE_MCS_LDPC_MSK_V1)
874 		rate->ldpc = true;
875 	if (ucode_rate & RATE_MCS_STBC_MSK)
876 		rate->stbc = true;
877 	if (ucode_rate & RATE_MCS_BF_MSK)
878 		rate->bfer = true;
879 
880 	rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK_V1;
881 
882 	if (ucode_rate & RATE_MCS_HT_MSK_V1) {
883 		nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK_V1) >>
884 		       RATE_HT_MCS_NSS_POS_V1) + 1;
885 
886 		if (nss == 1) {
887 			rate->type = LQ_HT_SISO;
888 			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
889 				  "stbc %d bfer %d",
890 				  rate->stbc, rate->bfer);
891 		} else if (nss == 2) {
892 			rate->type = LQ_HT_MIMO2;
893 			WARN_ON_ONCE(num_of_ant != 2);
894 		} else {
895 			WARN_ON_ONCE(1);
896 		}
897 	} else if (ucode_rate & RATE_MCS_VHT_MSK_V1) {
898 		nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
899 		       RATE_VHT_MCS_NSS_POS) + 1;
900 
901 		if (nss == 1) {
902 			rate->type = LQ_VHT_SISO;
903 			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
904 				  "stbc %d bfer %d",
905 				  rate->stbc, rate->bfer);
906 		} else if (nss == 2) {
907 			rate->type = LQ_VHT_MIMO2;
908 			WARN_ON_ONCE(num_of_ant != 2);
909 		} else {
910 			WARN_ON_ONCE(1);
911 		}
912 	} else if (ucode_rate & RATE_MCS_HE_MSK_V1) {
913 		nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
914 		      RATE_VHT_MCS_NSS_POS) + 1;
915 
916 		if (nss == 1) {
917 			rate->type = LQ_HE_SISO;
918 			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
919 				  "stbc %d bfer %d", rate->stbc, rate->bfer);
920 		} else if (nss == 2) {
921 			rate->type = LQ_HE_MIMO2;
922 			WARN_ON_ONCE(num_of_ant != 2);
923 		} else {
924 			WARN_ON_ONCE(1);
925 		}
926 	}
927 
928 	WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
929 		     !is_he(rate) && !is_vht(rate));
930 
931 	return 0;
932 }
933 
934 /* switch to another antenna/antennas and return 1 */
935 /* if no other valid antenna found, return 0 */
rs_toggle_antenna(u32 valid_ant,struct rs_rate * rate)936 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
937 {
938 	u8 new_ant_type;
939 
940 	if (!rs_is_valid_ant(valid_ant, rate->ant))
941 		return 0;
942 
943 	new_ant_type = ant_toggle_lookup[rate->ant];
944 
945 	while ((new_ant_type != rate->ant) &&
946 	       !rs_is_valid_ant(valid_ant, new_ant_type))
947 		new_ant_type = ant_toggle_lookup[new_ant_type];
948 
949 	if (new_ant_type == rate->ant)
950 		return 0;
951 
952 	rate->ant = new_ant_type;
953 
954 	return 1;
955 }
956 
rs_get_supported_rates(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)957 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
958 				  struct rs_rate *rate)
959 {
960 	if (is_legacy(rate))
961 		return lq_sta->active_legacy_rate;
962 	else if (is_siso(rate))
963 		return lq_sta->active_siso_rate;
964 	else if (is_mimo2(rate))
965 		return lq_sta->active_mimo2_rate;
966 
967 	WARN_ON_ONCE(1);
968 	return 0;
969 }
970 
rs_get_adjacent_rate(struct iwl_mvm * mvm,u8 index,u16 rate_mask,int rate_type)971 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
972 				int rate_type)
973 {
974 	u8 high = IWL_RATE_INVALID;
975 	u8 low = IWL_RATE_INVALID;
976 
977 	/* 802.11A or ht walks to the next literal adjacent rate in
978 	 * the rate table */
979 	if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
980 		int i;
981 		u32 mask;
982 
983 		/* Find the previous rate that is in the rate mask */
984 		i = index - 1;
985 		if (i >= 0)
986 			mask = BIT(i);
987 		for (; i >= 0; i--, mask >>= 1) {
988 			if (rate_mask & mask) {
989 				low = i;
990 				break;
991 			}
992 		}
993 
994 		/* Find the next rate that is in the rate mask */
995 		i = index + 1;
996 		for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
997 			if (rate_mask & mask) {
998 				high = i;
999 				break;
1000 			}
1001 		}
1002 
1003 		return (high << 8) | low;
1004 	}
1005 
1006 	low = index;
1007 	while (low != IWL_RATE_INVALID) {
1008 		low = iwl_rates[low].prev_rs;
1009 		if (low == IWL_RATE_INVALID)
1010 			break;
1011 		if (rate_mask & (1 << low))
1012 			break;
1013 	}
1014 
1015 	high = index;
1016 	while (high != IWL_RATE_INVALID) {
1017 		high = iwl_rates[high].next_rs;
1018 		if (high == IWL_RATE_INVALID)
1019 			break;
1020 		if (rate_mask & (1 << high))
1021 			break;
1022 	}
1023 
1024 	return (high << 8) | low;
1025 }
1026 
rs_rate_supported(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1027 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1028 				     struct rs_rate *rate)
1029 {
1030 	return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1031 }
1032 
1033 /* Get the next supported lower rate in the current column.
1034  * Return true if bottom rate in the current column was reached
1035  */
rs_get_lower_rate_in_column(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1036 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1037 					struct rs_rate *rate)
1038 {
1039 	u8 low;
1040 	u16 high_low;
1041 	u16 rate_mask;
1042 	struct iwl_mvm *mvm = lq_sta->pers.drv;
1043 
1044 	rate_mask = rs_get_supported_rates(lq_sta, rate);
1045 	high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1046 					rate->type);
1047 	low = high_low & 0xff;
1048 
1049 	/* Bottom rate of column reached */
1050 	if (low == IWL_RATE_INVALID)
1051 		return true;
1052 
1053 	rate->index = low;
1054 	return false;
1055 }
1056 
1057 /* Get the next rate to use following a column downgrade */
rs_get_lower_rate_down_column(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1058 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1059 					  struct rs_rate *rate)
1060 {
1061 	struct iwl_mvm *mvm = lq_sta->pers.drv;
1062 
1063 	if (is_legacy(rate)) {
1064 		/* No column to downgrade from Legacy */
1065 		return;
1066 	} else if (is_siso(rate)) {
1067 		/* Downgrade to Legacy if we were in SISO */
1068 		if (lq_sta->band == NL80211_BAND_5GHZ)
1069 			rate->type = LQ_LEGACY_A;
1070 		else
1071 			rate->type = LQ_LEGACY_G;
1072 
1073 		rate->bw = RATE_MCS_CHAN_WIDTH_20;
1074 
1075 		WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1076 			     rate->index > IWL_RATE_MCS_9_INDEX);
1077 
1078 		rate->index = rs_ht_to_legacy[rate->index];
1079 		rate->ldpc = false;
1080 	} else {
1081 		/* Downgrade to SISO with same MCS if in MIMO  */
1082 		rate->type = is_vht_mimo2(rate) ?
1083 			LQ_VHT_SISO : LQ_HT_SISO;
1084 	}
1085 
1086 	if (num_of_ant(rate->ant) > 1)
1087 		rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1088 
1089 	/* Relevant in both switching to SISO or Legacy */
1090 	rate->sgi = false;
1091 
1092 	if (!rs_rate_supported(lq_sta, rate))
1093 		rs_get_lower_rate_in_column(lq_sta, rate);
1094 }
1095 
1096 /* Check if both rates share the same column */
rs_rate_column_match(struct rs_rate * a,struct rs_rate * b)1097 static inline bool rs_rate_column_match(struct rs_rate *a,
1098 					struct rs_rate *b)
1099 {
1100 	bool ant_match;
1101 
1102 	if (a->stbc || a->bfer)
1103 		ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1104 	else
1105 		ant_match = (a->ant == b->ant);
1106 
1107 	return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1108 		&& ant_match;
1109 }
1110 
rs_get_column_from_rate(struct rs_rate * rate)1111 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1112 {
1113 	if (is_legacy(rate)) {
1114 		if (rate->ant == ANT_A)
1115 			return RS_COLUMN_LEGACY_ANT_A;
1116 
1117 		if (rate->ant == ANT_B)
1118 			return RS_COLUMN_LEGACY_ANT_B;
1119 
1120 		goto err;
1121 	}
1122 
1123 	if (is_siso(rate)) {
1124 		if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1125 			return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1126 				RS_COLUMN_SISO_ANT_A;
1127 
1128 		if (rate->ant == ANT_B)
1129 			return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1130 				RS_COLUMN_SISO_ANT_B;
1131 
1132 		goto err;
1133 	}
1134 
1135 	if (is_mimo(rate))
1136 		return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1137 
1138 err:
1139 	return RS_COLUMN_INVALID;
1140 }
1141 
rs_get_tid(struct ieee80211_hdr * hdr)1142 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1143 {
1144 	u8 tid = IWL_MAX_TID_COUNT;
1145 
1146 	if (ieee80211_is_data_qos(hdr->frame_control)) {
1147 		u8 *qc = ieee80211_get_qos_ctl(hdr);
1148 		tid = qc[0] & 0xf;
1149 	}
1150 
1151 	if (unlikely(tid > IWL_MAX_TID_COUNT))
1152 		tid = IWL_MAX_TID_COUNT;
1153 
1154 	return tid;
1155 }
1156 
1157 /*
1158  * mac80211 sends us Tx status
1159  */
rs_drv_mac80211_tx_status(void * mvm_r,struct ieee80211_supported_band * sband,struct ieee80211_sta * sta,void * priv_sta,struct sk_buff * skb)1160 static void rs_drv_mac80211_tx_status(void *mvm_r,
1161 				      struct ieee80211_supported_band *sband,
1162 				      struct ieee80211_sta *sta, void *priv_sta,
1163 				      struct sk_buff *skb)
1164 {
1165 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1166 	struct iwl_op_mode *op_mode = mvm_r;
1167 	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1168 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1169 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1170 
1171 	if (!mvmsta->vif)
1172 		return;
1173 
1174 	if (!ieee80211_is_data(hdr->frame_control) ||
1175 	    info->flags & IEEE80211_TX_CTL_NO_ACK)
1176 		return;
1177 
1178 	iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1179 			     ieee80211_is_qos_nullfunc(hdr->frame_control));
1180 }
1181 
1182 /*
1183  * Begin a period of staying with a selected modulation mode.
1184  * Set "stay_in_tbl" flag to prevent any mode switches.
1185  * Set frame tx success limits according to legacy vs. high-throughput,
1186  * and reset overall (spanning all rates) tx success history statistics.
1187  * These control how long we stay using same modulation mode before
1188  * searching for a new mode.
1189  */
rs_set_stay_in_table(struct iwl_mvm * mvm,u8 is_legacy,struct iwl_lq_sta * lq_sta)1190 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1191 				 struct iwl_lq_sta *lq_sta)
1192 {
1193 	IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1194 	lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1195 	if (is_legacy) {
1196 		lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1197 		lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1198 		lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1199 	} else {
1200 		lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1201 		lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1202 		lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1203 	}
1204 	lq_sta->table_count = 0;
1205 	lq_sta->total_failed = 0;
1206 	lq_sta->total_success = 0;
1207 	lq_sta->flush_timer = jiffies;
1208 	lq_sta->visited_columns = 0;
1209 }
1210 
rs_get_max_rate_from_mask(unsigned long rate_mask)1211 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1212 {
1213 	if (rate_mask)
1214 		return find_last_bit(&rate_mask, BITS_PER_LONG);
1215 	return IWL_RATE_INVALID;
1216 }
1217 
rs_get_max_allowed_rate(struct iwl_lq_sta * lq_sta,const struct rs_tx_column * column)1218 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1219 				   const struct rs_tx_column *column)
1220 {
1221 	switch (column->mode) {
1222 	case RS_LEGACY:
1223 		return lq_sta->max_legacy_rate_idx;
1224 	case RS_SISO:
1225 		return lq_sta->max_siso_rate_idx;
1226 	case RS_MIMO2:
1227 		return lq_sta->max_mimo2_rate_idx;
1228 	default:
1229 		WARN_ON_ONCE(1);
1230 	}
1231 
1232 	return lq_sta->max_legacy_rate_idx;
1233 }
1234 
rs_get_expected_tpt_table(struct iwl_lq_sta * lq_sta,const struct rs_tx_column * column,u32 bw)1235 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1236 					    const struct rs_tx_column *column,
1237 					    u32 bw)
1238 {
1239 	/* Used to choose among HT tables */
1240 	const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1241 
1242 	if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1243 			 column->mode != RS_SISO &&
1244 			 column->mode != RS_MIMO2))
1245 		return expected_tpt_legacy;
1246 
1247 	/* Legacy rates have only one table */
1248 	if (column->mode == RS_LEGACY)
1249 		return expected_tpt_legacy;
1250 
1251 	ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1252 	/* Choose among many HT tables depending on number of streams
1253 	 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1254 	 * status */
1255 	if (column->mode == RS_SISO) {
1256 		switch (bw) {
1257 		case RATE_MCS_CHAN_WIDTH_20:
1258 			ht_tbl_pointer = expected_tpt_siso_20MHz;
1259 			break;
1260 		case RATE_MCS_CHAN_WIDTH_40:
1261 			ht_tbl_pointer = expected_tpt_siso_40MHz;
1262 			break;
1263 		case RATE_MCS_CHAN_WIDTH_80:
1264 			ht_tbl_pointer = expected_tpt_siso_80MHz;
1265 			break;
1266 		case RATE_MCS_CHAN_WIDTH_160:
1267 			ht_tbl_pointer = expected_tpt_siso_160MHz;
1268 			break;
1269 		default:
1270 			WARN_ON_ONCE(1);
1271 		}
1272 	} else if (column->mode == RS_MIMO2) {
1273 		switch (bw) {
1274 		case RATE_MCS_CHAN_WIDTH_20:
1275 			ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1276 			break;
1277 		case RATE_MCS_CHAN_WIDTH_40:
1278 			ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1279 			break;
1280 		case RATE_MCS_CHAN_WIDTH_80:
1281 			ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1282 			break;
1283 		case RATE_MCS_CHAN_WIDTH_160:
1284 			ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1285 			break;
1286 		default:
1287 			WARN_ON_ONCE(1);
1288 		}
1289 	} else {
1290 		WARN_ON_ONCE(1);
1291 	}
1292 
1293 	if (!column->sgi && !lq_sta->is_agg)		/* Normal */
1294 		return ht_tbl_pointer[0];
1295 	else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1296 		return ht_tbl_pointer[1];
1297 	else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1298 		return ht_tbl_pointer[2];
1299 	else						/* AGG+SGI */
1300 		return ht_tbl_pointer[3];
1301 }
1302 
rs_set_expected_tpt_table(struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)1303 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1304 				      struct iwl_scale_tbl_info *tbl)
1305 {
1306 	struct rs_rate *rate = &tbl->rate;
1307 	const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1308 
1309 	tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1310 }
1311 
1312 /* rs uses two tables, one is active and the second is for searching better
1313  * configuration. This function, according to the index of the currently
1314  * active table returns the search table, which is located at the
1315  * index complementary to 1 according to the active table (active = 1,
1316  * search = 0 or active = 0, search = 1).
1317  * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1318  */
rs_search_tbl(u8 active_tbl)1319 static inline u8 rs_search_tbl(u8 active_tbl)
1320 {
1321 	return (active_tbl ^ 1) & 1;
1322 }
1323 
rs_get_best_rate(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,unsigned long rate_mask,s8 index)1324 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1325 			    struct iwl_lq_sta *lq_sta,
1326 			    struct iwl_scale_tbl_info *tbl,	/* "search" */
1327 			    unsigned long rate_mask, s8 index)
1328 {
1329 	struct iwl_scale_tbl_info *active_tbl =
1330 	    &(lq_sta->lq_info[lq_sta->active_tbl]);
1331 	s32 success_ratio = active_tbl->win[index].success_ratio;
1332 	u16 expected_current_tpt = active_tbl->expected_tpt[index];
1333 	const u16 *tpt_tbl = tbl->expected_tpt;
1334 	u16 high_low;
1335 	u32 target_tpt;
1336 	int rate_idx;
1337 
1338 	if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1339 		target_tpt = 100 * expected_current_tpt;
1340 		IWL_DEBUG_RATE(mvm,
1341 			       "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1342 			       success_ratio, target_tpt);
1343 	} else {
1344 		target_tpt = lq_sta->last_tpt;
1345 		IWL_DEBUG_RATE(mvm,
1346 			       "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1347 			       success_ratio, target_tpt);
1348 	}
1349 
1350 	rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1351 
1352 	while (rate_idx != IWL_RATE_INVALID) {
1353 		if (target_tpt < (100 * tpt_tbl[rate_idx]))
1354 			break;
1355 
1356 		high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1357 						tbl->rate.type);
1358 
1359 		rate_idx = (high_low >> 8) & 0xff;
1360 	}
1361 
1362 	IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1363 		       rate_idx, target_tpt,
1364 		       rate_idx != IWL_RATE_INVALID ?
1365 		       100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1366 
1367 	return rate_idx;
1368 }
1369 
rs_bw_from_sta_bw(struct ieee80211_sta * sta)1370 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1371 {
1372 	struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->deflink.vht_cap;
1373 	struct ieee80211_vht_cap vht_cap = {
1374 		.vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1375 		.supp_mcs = sta_vht_cap->vht_mcs,
1376 	};
1377 
1378 	switch (sta->deflink.bandwidth) {
1379 	case IEEE80211_STA_RX_BW_160:
1380 		/*
1381 		 * Don't use 160 MHz if VHT extended NSS support
1382 		 * says we cannot use 2 streams, we don't want to
1383 		 * deal with this.
1384 		 * We only check MCS 0 - they will support that if
1385 		 * we got here at all and we don't care which MCS,
1386 		 * we want to determine a more global state.
1387 		 */
1388 		if (ieee80211_get_vht_max_nss(&vht_cap,
1389 					      IEEE80211_VHT_CHANWIDTH_160MHZ,
1390 					      0, true,
1391 					      sta->deflink.rx_nss) < sta->deflink.rx_nss)
1392 			return RATE_MCS_CHAN_WIDTH_80;
1393 		return RATE_MCS_CHAN_WIDTH_160;
1394 	case IEEE80211_STA_RX_BW_80:
1395 		return RATE_MCS_CHAN_WIDTH_80;
1396 	case IEEE80211_STA_RX_BW_40:
1397 		return RATE_MCS_CHAN_WIDTH_40;
1398 	case IEEE80211_STA_RX_BW_20:
1399 	default:
1400 		return RATE_MCS_CHAN_WIDTH_20;
1401 	}
1402 }
1403 
1404 /*
1405  * Check whether we should continue using same modulation mode, or
1406  * begin search for a new mode, based on:
1407  * 1) # tx successes or failures while using this mode
1408  * 2) # times calling this function
1409  * 3) elapsed time in this mode (not used, for now)
1410  */
rs_stay_in_table(struct iwl_lq_sta * lq_sta,bool force_search)1411 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1412 {
1413 	struct iwl_scale_tbl_info *tbl;
1414 	int active_tbl;
1415 	int flush_interval_passed = 0;
1416 	struct iwl_mvm *mvm;
1417 
1418 	mvm = lq_sta->pers.drv;
1419 	active_tbl = lq_sta->active_tbl;
1420 
1421 	tbl = &(lq_sta->lq_info[active_tbl]);
1422 
1423 	/* If we've been disallowing search, see if we should now allow it */
1424 	if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1425 		/* Elapsed time using current modulation mode */
1426 		if (lq_sta->flush_timer)
1427 			flush_interval_passed =
1428 				time_after(jiffies,
1429 					   (unsigned long)(lq_sta->flush_timer +
1430 							   (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1431 
1432 		/*
1433 		 * Check if we should allow search for new modulation mode.
1434 		 * If many frames have failed or succeeded, or we've used
1435 		 * this same modulation for a long time, allow search, and
1436 		 * reset history stats that keep track of whether we should
1437 		 * allow a new search.  Also (below) reset all bitmaps and
1438 		 * stats in active history.
1439 		 */
1440 		if (force_search ||
1441 		    (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1442 		    (lq_sta->total_success > lq_sta->max_success_limit) ||
1443 		    ((!lq_sta->search_better_tbl) &&
1444 		     (lq_sta->flush_timer) && (flush_interval_passed))) {
1445 			IWL_DEBUG_RATE(mvm,
1446 				       "LQ: stay is expired %d %d %d\n",
1447 				     lq_sta->total_failed,
1448 				     lq_sta->total_success,
1449 				     flush_interval_passed);
1450 
1451 			/* Allow search for new mode */
1452 			lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1453 			IWL_DEBUG_RATE(mvm,
1454 				       "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1455 			lq_sta->total_failed = 0;
1456 			lq_sta->total_success = 0;
1457 			lq_sta->flush_timer = 0;
1458 			/* mark the current column as visited */
1459 			lq_sta->visited_columns = BIT(tbl->column);
1460 		/*
1461 		 * Else if we've used this modulation mode enough repetitions
1462 		 * (regardless of elapsed time or success/failure), reset
1463 		 * history bitmaps and rate-specific stats for all rates in
1464 		 * active table.
1465 		 */
1466 		} else {
1467 			lq_sta->table_count++;
1468 			if (lq_sta->table_count >=
1469 			    lq_sta->table_count_limit) {
1470 				lq_sta->table_count = 0;
1471 
1472 				IWL_DEBUG_RATE(mvm,
1473 					       "LQ: stay in table clear win\n");
1474 				rs_rate_scale_clear_tbl_windows(mvm, tbl);
1475 			}
1476 		}
1477 
1478 		/* If transitioning to allow "search", reset all history
1479 		 * bitmaps and stats in active table (this will become the new
1480 		 * "search" table). */
1481 		if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1482 			rs_rate_scale_clear_tbl_windows(mvm, tbl);
1483 		}
1484 	}
1485 }
1486 
rs_set_amsdu_len(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl,enum rs_action scale_action)1487 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1488 			     struct iwl_scale_tbl_info *tbl,
1489 			     enum rs_action scale_action)
1490 {
1491 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1492 	int i;
1493 
1494 	sta->max_amsdu_len = rs_fw_get_max_amsdu_len(sta);
1495 
1496 	/*
1497 	 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1498 	 * or 0, since there is no per-TID alg.
1499 	 */
1500 	if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1501 	    tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1502 	    scale_action == RS_ACTION_DOWNSCALE)
1503 		mvmsta->amsdu_enabled = 0;
1504 	else
1505 		mvmsta->amsdu_enabled = 0xFFFF;
1506 
1507 	if (mvmsta->vif->bss_conf.he_support &&
1508 	    !iwlwifi_mod_params.disable_11ax)
1509 		mvmsta->max_amsdu_len = sta->max_amsdu_len;
1510 	else
1511 		mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1512 
1513 	sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1514 
1515 	for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1516 		if (mvmsta->amsdu_enabled)
1517 			sta->max_tid_amsdu_len[i] =
1518 				iwl_mvm_max_amsdu_size(mvm, sta, i);
1519 		else
1520 			/*
1521 			 * Not so elegant, but this will effectively
1522 			 * prevent AMSDU on this TID
1523 			 */
1524 			sta->max_tid_amsdu_len[i] = 1;
1525 	}
1526 }
1527 
1528 /*
1529  * setup rate table in uCode
1530  */
rs_update_rate_tbl(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)1531 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1532 			       struct ieee80211_sta *sta,
1533 			       struct iwl_lq_sta *lq_sta,
1534 			       struct iwl_scale_tbl_info *tbl)
1535 {
1536 	rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1537 	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1538 }
1539 
rs_tweak_rate_tbl(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,enum rs_action scale_action)1540 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1541 			      struct ieee80211_sta *sta,
1542 			      struct iwl_lq_sta *lq_sta,
1543 			      struct iwl_scale_tbl_info *tbl,
1544 			      enum rs_action scale_action)
1545 {
1546 	if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1547 		return false;
1548 
1549 	if (!is_vht_siso(&tbl->rate))
1550 		return false;
1551 
1552 	if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1553 	    (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1554 	    (scale_action == RS_ACTION_DOWNSCALE)) {
1555 		tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1556 		tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1557 		IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1558 		goto tweaked;
1559 	}
1560 
1561 	/* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1562 	 * sustainable, i.e. we're past the test window. We can't go back
1563 	 * if MCS5 is just tested as this will happen always after switching
1564 	 * to 20Mhz MCS4 because the rate stats are cleared.
1565 	 */
1566 	if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1567 	    (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1568 	     (scale_action == RS_ACTION_STAY)) ||
1569 	     ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1570 	      (scale_action == RS_ACTION_UPSCALE)))) {
1571 		tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1572 		tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1573 		IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1574 		goto tweaked;
1575 	}
1576 
1577 	return false;
1578 
1579 tweaked:
1580 	rs_set_expected_tpt_table(lq_sta, tbl);
1581 	rs_rate_scale_clear_tbl_windows(mvm, tbl);
1582 	return true;
1583 }
1584 
rs_get_next_column(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl)1585 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1586 					 struct iwl_lq_sta *lq_sta,
1587 					 struct ieee80211_sta *sta,
1588 					 struct iwl_scale_tbl_info *tbl)
1589 {
1590 	int i, j, max_rate;
1591 	enum rs_column next_col_id;
1592 	const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1593 	const struct rs_tx_column *next_col;
1594 	allow_column_func_t allow_func;
1595 	u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1596 	const u16 *expected_tpt_tbl;
1597 	u16 tpt, max_expected_tpt;
1598 
1599 	for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1600 		next_col_id = curr_col->next_columns[i];
1601 
1602 		if (next_col_id == RS_COLUMN_INVALID)
1603 			continue;
1604 
1605 		if (lq_sta->visited_columns & BIT(next_col_id)) {
1606 			IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1607 				       next_col_id);
1608 			continue;
1609 		}
1610 
1611 		next_col = &rs_tx_columns[next_col_id];
1612 
1613 		if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1614 			IWL_DEBUG_RATE(mvm,
1615 				       "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1616 				       next_col_id, valid_ants, next_col->ant);
1617 			continue;
1618 		}
1619 
1620 		for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1621 			allow_func = next_col->checks[j];
1622 			if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1623 						      next_col))
1624 				break;
1625 		}
1626 
1627 		if (j != MAX_COLUMN_CHECKS) {
1628 			IWL_DEBUG_RATE(mvm,
1629 				       "Skip column %d: not allowed (check %d failed)\n",
1630 				       next_col_id, j);
1631 
1632 			continue;
1633 		}
1634 
1635 		tpt = lq_sta->last_tpt / 100;
1636 		expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1637 						     rs_bw_from_sta_bw(sta));
1638 		if (WARN_ON_ONCE(!expected_tpt_tbl))
1639 			continue;
1640 
1641 		max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1642 		if (max_rate == IWL_RATE_INVALID) {
1643 			IWL_DEBUG_RATE(mvm,
1644 				       "Skip column %d: no rate is allowed in this column\n",
1645 				       next_col_id);
1646 			continue;
1647 		}
1648 
1649 		max_expected_tpt = expected_tpt_tbl[max_rate];
1650 		if (tpt >= max_expected_tpt) {
1651 			IWL_DEBUG_RATE(mvm,
1652 				       "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1653 				       next_col_id, max_expected_tpt, tpt);
1654 			continue;
1655 		}
1656 
1657 		IWL_DEBUG_RATE(mvm,
1658 			       "Found potential column %d. Max expected %d current %d\n",
1659 			       next_col_id, max_expected_tpt, tpt);
1660 		break;
1661 	}
1662 
1663 	if (i == MAX_NEXT_COLUMNS)
1664 		return RS_COLUMN_INVALID;
1665 
1666 	return next_col_id;
1667 }
1668 
rs_switch_to_column(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct ieee80211_sta * sta,enum rs_column col_id)1669 static int rs_switch_to_column(struct iwl_mvm *mvm,
1670 			       struct iwl_lq_sta *lq_sta,
1671 			       struct ieee80211_sta *sta,
1672 			       enum rs_column col_id)
1673 {
1674 	struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1675 	struct iwl_scale_tbl_info *search_tbl =
1676 		&lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1677 	struct rs_rate *rate = &search_tbl->rate;
1678 	const struct rs_tx_column *column = &rs_tx_columns[col_id];
1679 	const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1680 	unsigned long rate_mask = 0;
1681 	u32 rate_idx = 0;
1682 
1683 	memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1684 
1685 	rate->sgi = column->sgi;
1686 	rate->ant = column->ant;
1687 
1688 	if (column->mode == RS_LEGACY) {
1689 		if (lq_sta->band == NL80211_BAND_5GHZ)
1690 			rate->type = LQ_LEGACY_A;
1691 		else
1692 			rate->type = LQ_LEGACY_G;
1693 
1694 		rate->bw = RATE_MCS_CHAN_WIDTH_20;
1695 		rate->ldpc = false;
1696 		rate_mask = lq_sta->active_legacy_rate;
1697 	} else if (column->mode == RS_SISO) {
1698 		rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1699 		rate_mask = lq_sta->active_siso_rate;
1700 	} else if (column->mode == RS_MIMO2) {
1701 		rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1702 		rate_mask = lq_sta->active_mimo2_rate;
1703 	} else {
1704 		WARN_ONCE(1, "Bad column mode");
1705 	}
1706 
1707 	if (column->mode != RS_LEGACY) {
1708 		rate->bw = rs_bw_from_sta_bw(sta);
1709 		rate->ldpc = lq_sta->ldpc;
1710 	}
1711 
1712 	search_tbl->column = col_id;
1713 	rs_set_expected_tpt_table(lq_sta, search_tbl);
1714 
1715 	lq_sta->visited_columns |= BIT(col_id);
1716 
1717 	/* Get the best matching rate if we're changing modes. e.g.
1718 	 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1719 	 */
1720 	if (curr_column->mode != column->mode) {
1721 		rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1722 					    rate_mask, rate->index);
1723 
1724 		if ((rate_idx == IWL_RATE_INVALID) ||
1725 		    !(BIT(rate_idx) & rate_mask)) {
1726 			IWL_DEBUG_RATE(mvm,
1727 				       "can not switch with index %d"
1728 				       " rate mask %lx\n",
1729 				       rate_idx, rate_mask);
1730 
1731 			goto err;
1732 		}
1733 
1734 		rate->index = rate_idx;
1735 	}
1736 
1737 	IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1738 		       col_id, rate->index);
1739 
1740 	return 0;
1741 
1742 err:
1743 	rate->type = LQ_NONE;
1744 	return -1;
1745 }
1746 
rs_get_rate_action(struct iwl_mvm * mvm,struct iwl_scale_tbl_info * tbl,s32 sr,int low,int high,int current_tpt,int low_tpt,int high_tpt)1747 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1748 					 struct iwl_scale_tbl_info *tbl,
1749 					 s32 sr, int low, int high,
1750 					 int current_tpt,
1751 					 int low_tpt, int high_tpt)
1752 {
1753 	enum rs_action action = RS_ACTION_STAY;
1754 
1755 	if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1756 	    (current_tpt == 0)) {
1757 		IWL_DEBUG_RATE(mvm,
1758 			       "Decrease rate because of low SR\n");
1759 		return RS_ACTION_DOWNSCALE;
1760 	}
1761 
1762 	if ((low_tpt == IWL_INVALID_VALUE) &&
1763 	    (high_tpt == IWL_INVALID_VALUE) &&
1764 	    (high != IWL_RATE_INVALID)) {
1765 		IWL_DEBUG_RATE(mvm,
1766 			       "No data about high/low rates. Increase rate\n");
1767 		return RS_ACTION_UPSCALE;
1768 	}
1769 
1770 	if ((high_tpt == IWL_INVALID_VALUE) &&
1771 	    (high != IWL_RATE_INVALID) &&
1772 	    (low_tpt != IWL_INVALID_VALUE) &&
1773 	    (low_tpt < current_tpt)) {
1774 		IWL_DEBUG_RATE(mvm,
1775 			       "No data about high rate and low rate is worse. Increase rate\n");
1776 		return RS_ACTION_UPSCALE;
1777 	}
1778 
1779 	if ((high_tpt != IWL_INVALID_VALUE) &&
1780 	    (high_tpt > current_tpt)) {
1781 		IWL_DEBUG_RATE(mvm,
1782 			       "Higher rate is better. Increate rate\n");
1783 		return RS_ACTION_UPSCALE;
1784 	}
1785 
1786 	if ((low_tpt != IWL_INVALID_VALUE) &&
1787 	    (high_tpt != IWL_INVALID_VALUE) &&
1788 	    (low_tpt < current_tpt) &&
1789 	    (high_tpt < current_tpt)) {
1790 		IWL_DEBUG_RATE(mvm,
1791 			       "Both high and low are worse. Maintain rate\n");
1792 		return RS_ACTION_STAY;
1793 	}
1794 
1795 	if ((low_tpt != IWL_INVALID_VALUE) &&
1796 	    (low_tpt > current_tpt)) {
1797 		IWL_DEBUG_RATE(mvm,
1798 			       "Lower rate is better\n");
1799 		action = RS_ACTION_DOWNSCALE;
1800 		goto out;
1801 	}
1802 
1803 	if ((low_tpt == IWL_INVALID_VALUE) &&
1804 	    (low != IWL_RATE_INVALID)) {
1805 		IWL_DEBUG_RATE(mvm,
1806 			       "No data about lower rate\n");
1807 		action = RS_ACTION_DOWNSCALE;
1808 		goto out;
1809 	}
1810 
1811 	IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1812 
1813 out:
1814 	if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1815 		if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1816 			IWL_DEBUG_RATE(mvm,
1817 				       "SR is above NO DECREASE. Avoid downscale\n");
1818 			action = RS_ACTION_STAY;
1819 		} else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1820 			IWL_DEBUG_RATE(mvm,
1821 				       "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1822 			action = RS_ACTION_STAY;
1823 		} else {
1824 			IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1825 		}
1826 	}
1827 
1828 	return action;
1829 }
1830 
rs_stbc_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)1831 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1832 			  struct iwl_lq_sta *lq_sta)
1833 {
1834 	/* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1835 	 * supports STBC of at least 1*SS
1836 	 */
1837 	if (!lq_sta->stbc_capable)
1838 		return false;
1839 
1840 	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1841 		return false;
1842 
1843 	return true;
1844 }
1845 
rs_get_adjacent_txp(struct iwl_mvm * mvm,int index,int * weaker,int * stronger)1846 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1847 				int *weaker, int *stronger)
1848 {
1849 	*weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1850 	if (*weaker > TPC_MAX_REDUCTION)
1851 		*weaker = TPC_INVALID;
1852 
1853 	*stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1854 	if (*stronger < 0)
1855 		*stronger = TPC_INVALID;
1856 }
1857 
rs_tpc_allowed(struct iwl_mvm * mvm,struct ieee80211_vif * vif,struct rs_rate * rate,enum nl80211_band band)1858 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1859 			   struct rs_rate *rate, enum nl80211_band band)
1860 {
1861 	int index = rate->index;
1862 	bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1863 	bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1864 				!vif->bss_conf.ps);
1865 
1866 	IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1867 		       cam, sta_ps_disabled);
1868 	/*
1869 	 * allow tpc only if power management is enabled, or bt coex
1870 	 * activity grade allows it and we are on 2.4Ghz.
1871 	 */
1872 	if ((cam || sta_ps_disabled) &&
1873 	    !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1874 		return false;
1875 
1876 	IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1877 	if (is_legacy(rate))
1878 		return index == IWL_RATE_54M_INDEX;
1879 	if (is_ht(rate))
1880 		return index == IWL_RATE_MCS_7_INDEX;
1881 	if (is_vht(rate))
1882 		return index == IWL_RATE_MCS_9_INDEX;
1883 
1884 	WARN_ON_ONCE(1);
1885 	return false;
1886 }
1887 
1888 enum tpc_action {
1889 	TPC_ACTION_STAY,
1890 	TPC_ACTION_DECREASE,
1891 	TPC_ACTION_INCREASE,
1892 	TPC_ACTION_NO_RESTIRCTION,
1893 };
1894 
rs_get_tpc_action(struct iwl_mvm * mvm,s32 sr,int weak,int strong,int current_tpt,int weak_tpt,int strong_tpt)1895 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1896 					 s32 sr, int weak, int strong,
1897 					 int current_tpt,
1898 					 int weak_tpt, int strong_tpt)
1899 {
1900 	/* stay until we have valid tpt */
1901 	if (current_tpt == IWL_INVALID_VALUE) {
1902 		IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1903 		return TPC_ACTION_STAY;
1904 	}
1905 
1906 	/* Too many failures, increase txp */
1907 	if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1908 	    current_tpt == 0) {
1909 		IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1910 		return TPC_ACTION_NO_RESTIRCTION;
1911 	}
1912 
1913 	/* try decreasing first if applicable */
1914 	if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1915 	    weak != TPC_INVALID) {
1916 		if (weak_tpt == IWL_INVALID_VALUE &&
1917 		    (strong_tpt == IWL_INVALID_VALUE ||
1918 		     current_tpt >= strong_tpt)) {
1919 			IWL_DEBUG_RATE(mvm,
1920 				       "no weak txp measurement. decrease txp\n");
1921 			return TPC_ACTION_DECREASE;
1922 		}
1923 
1924 		if (weak_tpt > current_tpt) {
1925 			IWL_DEBUG_RATE(mvm,
1926 				       "lower txp has better tpt. decrease txp\n");
1927 			return TPC_ACTION_DECREASE;
1928 		}
1929 	}
1930 
1931 	/* next, increase if needed */
1932 	if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1933 	    strong != TPC_INVALID) {
1934 		if (weak_tpt == IWL_INVALID_VALUE &&
1935 		    strong_tpt != IWL_INVALID_VALUE &&
1936 		    current_tpt < strong_tpt) {
1937 			IWL_DEBUG_RATE(mvm,
1938 				       "higher txp has better tpt. increase txp\n");
1939 			return TPC_ACTION_INCREASE;
1940 		}
1941 
1942 		if (weak_tpt < current_tpt &&
1943 		    (strong_tpt == IWL_INVALID_VALUE ||
1944 		     strong_tpt > current_tpt)) {
1945 			IWL_DEBUG_RATE(mvm,
1946 				       "lower txp has worse tpt. increase txp\n");
1947 			return TPC_ACTION_INCREASE;
1948 		}
1949 	}
1950 
1951 	IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1952 	return TPC_ACTION_STAY;
1953 }
1954 
rs_tpc_perform(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)1955 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1956 			   struct ieee80211_sta *sta,
1957 			   struct iwl_lq_sta *lq_sta,
1958 			   struct iwl_scale_tbl_info *tbl)
1959 {
1960 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1961 	struct ieee80211_vif *vif = mvm_sta->vif;
1962 	struct ieee80211_chanctx_conf *chanctx_conf;
1963 	enum nl80211_band band;
1964 	struct iwl_rate_scale_data *window;
1965 	struct rs_rate *rate = &tbl->rate;
1966 	enum tpc_action action;
1967 	s32 sr;
1968 	u8 cur = lq_sta->lq.reduced_tpc;
1969 	int current_tpt;
1970 	int weak, strong;
1971 	int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1972 
1973 #ifdef CONFIG_MAC80211_DEBUGFS
1974 	if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1975 		IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1976 			       lq_sta->pers.dbg_fixed_txp_reduction);
1977 		lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1978 		return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1979 	}
1980 #endif
1981 
1982 	rcu_read_lock();
1983 	chanctx_conf = rcu_dereference(vif->bss_conf.chanctx_conf);
1984 	if (WARN_ON(!chanctx_conf))
1985 		band = NUM_NL80211_BANDS;
1986 	else
1987 		band = chanctx_conf->def.chan->band;
1988 	rcu_read_unlock();
1989 
1990 	if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1991 		IWL_DEBUG_RATE(mvm,
1992 			       "tpc is not allowed. remove txp restrictions\n");
1993 		lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1994 		return cur != TPC_NO_REDUCTION;
1995 	}
1996 
1997 	rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1998 
1999 	/* Collect measured throughputs for current and adjacent rates */
2000 	window = tbl->tpc_win;
2001 	sr = window[cur].success_ratio;
2002 	current_tpt = window[cur].average_tpt;
2003 	if (weak != TPC_INVALID)
2004 		weak_tpt = window[weak].average_tpt;
2005 	if (strong != TPC_INVALID)
2006 		strong_tpt = window[strong].average_tpt;
2007 
2008 	IWL_DEBUG_RATE(mvm,
2009 		       "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2010 		       cur, current_tpt, sr, weak, strong,
2011 		       weak_tpt, strong_tpt);
2012 
2013 	action = rs_get_tpc_action(mvm, sr, weak, strong,
2014 				   current_tpt, weak_tpt, strong_tpt);
2015 
2016 	/* override actions if we are on the edge */
2017 	if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2018 		IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2019 		action = TPC_ACTION_STAY;
2020 	} else if (strong == TPC_INVALID &&
2021 		   (action == TPC_ACTION_INCREASE ||
2022 		    action == TPC_ACTION_NO_RESTIRCTION)) {
2023 		IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2024 		action = TPC_ACTION_STAY;
2025 	}
2026 
2027 	switch (action) {
2028 	case TPC_ACTION_DECREASE:
2029 		lq_sta->lq.reduced_tpc = weak;
2030 		return true;
2031 	case TPC_ACTION_INCREASE:
2032 		lq_sta->lq.reduced_tpc = strong;
2033 		return true;
2034 	case TPC_ACTION_NO_RESTIRCTION:
2035 		lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2036 		return true;
2037 	case TPC_ACTION_STAY:
2038 		/* do nothing */
2039 		break;
2040 	}
2041 	return false;
2042 }
2043 
2044 /*
2045  * Do rate scaling and search for new modulation mode.
2046  */
rs_rate_scale_perform(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,int tid,bool ndp)2047 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2048 				  struct ieee80211_sta *sta,
2049 				  struct iwl_lq_sta *lq_sta,
2050 				  int tid, bool ndp)
2051 {
2052 	int low = IWL_RATE_INVALID;
2053 	int high = IWL_RATE_INVALID;
2054 	int index;
2055 	struct iwl_rate_scale_data *window = NULL;
2056 	int current_tpt = IWL_INVALID_VALUE;
2057 	int low_tpt = IWL_INVALID_VALUE;
2058 	int high_tpt = IWL_INVALID_VALUE;
2059 	u32 fail_count;
2060 	enum rs_action scale_action = RS_ACTION_STAY;
2061 	u16 rate_mask;
2062 	u8 update_lq = 0;
2063 	struct iwl_scale_tbl_info *tbl, *tbl1;
2064 	u8 active_tbl = 0;
2065 	u8 done_search = 0;
2066 	u16 high_low;
2067 	s32 sr;
2068 	u8 prev_agg = lq_sta->is_agg;
2069 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2070 	struct rs_rate *rate;
2071 
2072 	lq_sta->is_agg = !!mvmsta->agg_tids;
2073 
2074 	/*
2075 	 * Select rate-scale / modulation-mode table to work with in
2076 	 * the rest of this function:  "search" if searching for better
2077 	 * modulation mode, or "active" if doing rate scaling within a mode.
2078 	 */
2079 	if (!lq_sta->search_better_tbl)
2080 		active_tbl = lq_sta->active_tbl;
2081 	else
2082 		active_tbl = rs_search_tbl(lq_sta->active_tbl);
2083 
2084 	tbl = &(lq_sta->lq_info[active_tbl]);
2085 	rate = &tbl->rate;
2086 
2087 	if (prev_agg != lq_sta->is_agg) {
2088 		IWL_DEBUG_RATE(mvm,
2089 			       "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2090 			       prev_agg, lq_sta->is_agg);
2091 		rs_set_expected_tpt_table(lq_sta, tbl);
2092 		rs_rate_scale_clear_tbl_windows(mvm, tbl);
2093 	}
2094 
2095 	/* current tx rate */
2096 	index = rate->index;
2097 
2098 	/* rates available for this association, and for modulation mode */
2099 	rate_mask = rs_get_supported_rates(lq_sta, rate);
2100 
2101 	if (!(BIT(index) & rate_mask)) {
2102 		IWL_ERR(mvm, "Current Rate is not valid\n");
2103 		if (lq_sta->search_better_tbl) {
2104 			/* revert to active table if search table is not valid*/
2105 			rate->type = LQ_NONE;
2106 			lq_sta->search_better_tbl = 0;
2107 			tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2108 			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2109 		}
2110 		return;
2111 	}
2112 
2113 	/* Get expected throughput table and history window for current rate */
2114 	if (!tbl->expected_tpt) {
2115 		IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2116 		return;
2117 	}
2118 
2119 	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2120 	window = &(tbl->win[index]);
2121 
2122 	/*
2123 	 * If there is not enough history to calculate actual average
2124 	 * throughput, keep analyzing results of more tx frames, without
2125 	 * changing rate or mode (bypass most of the rest of this function).
2126 	 * Set up new rate table in uCode only if old rate is not supported
2127 	 * in current association (use new rate found above).
2128 	 */
2129 	fail_count = window->counter - window->success_counter;
2130 	if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2131 	    (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2132 		IWL_DEBUG_RATE(mvm,
2133 			       "%s: Test Window: succ %d total %d\n",
2134 			       rs_pretty_rate(rate),
2135 			       window->success_counter, window->counter);
2136 
2137 		/* Can't calculate this yet; not enough history */
2138 		window->average_tpt = IWL_INVALID_VALUE;
2139 
2140 		/* Should we stay with this modulation mode,
2141 		 * or search for a new one? */
2142 		rs_stay_in_table(lq_sta, false);
2143 
2144 		return;
2145 	}
2146 
2147 	/* If we are searching for better modulation mode, check success. */
2148 	if (lq_sta->search_better_tbl) {
2149 		/* If good success, continue using the "search" mode;
2150 		 * no need to send new link quality command, since we're
2151 		 * continuing to use the setup that we've been trying. */
2152 		if (window->average_tpt > lq_sta->last_tpt) {
2153 			IWL_DEBUG_RATE(mvm,
2154 				       "SWITCHING TO NEW TABLE SR: %d "
2155 				       "cur-tpt %d old-tpt %d\n",
2156 				       window->success_ratio,
2157 				       window->average_tpt,
2158 				       lq_sta->last_tpt);
2159 
2160 			/* Swap tables; "search" becomes "active" */
2161 			lq_sta->active_tbl = active_tbl;
2162 			current_tpt = window->average_tpt;
2163 		/* Else poor success; go back to mode in "active" table */
2164 		} else {
2165 			IWL_DEBUG_RATE(mvm,
2166 				       "GOING BACK TO THE OLD TABLE: SR %d "
2167 				       "cur-tpt %d old-tpt %d\n",
2168 				       window->success_ratio,
2169 				       window->average_tpt,
2170 				       lq_sta->last_tpt);
2171 
2172 			/* Nullify "search" table */
2173 			rate->type = LQ_NONE;
2174 
2175 			/* Revert to "active" table */
2176 			active_tbl = lq_sta->active_tbl;
2177 			tbl = &(lq_sta->lq_info[active_tbl]);
2178 
2179 			/* Revert to "active" rate and throughput info */
2180 			index = tbl->rate.index;
2181 			current_tpt = lq_sta->last_tpt;
2182 
2183 			/* Need to set up a new rate table in uCode */
2184 			update_lq = 1;
2185 		}
2186 
2187 		/* Either way, we've made a decision; modulation mode
2188 		 * search is done, allow rate adjustment next time. */
2189 		lq_sta->search_better_tbl = 0;
2190 		done_search = 1;	/* Don't switch modes below! */
2191 		goto lq_update;
2192 	}
2193 
2194 	/* (Else) not in search of better modulation mode, try for better
2195 	 * starting rate, while staying in this mode. */
2196 	high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2197 	low = high_low & 0xff;
2198 	high = (high_low >> 8) & 0xff;
2199 
2200 	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2201 
2202 	sr = window->success_ratio;
2203 
2204 	/* Collect measured throughputs for current and adjacent rates */
2205 	current_tpt = window->average_tpt;
2206 	if (low != IWL_RATE_INVALID)
2207 		low_tpt = tbl->win[low].average_tpt;
2208 	if (high != IWL_RATE_INVALID)
2209 		high_tpt = tbl->win[high].average_tpt;
2210 
2211 	IWL_DEBUG_RATE(mvm,
2212 		       "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2213 		       rs_pretty_rate(rate), current_tpt, sr,
2214 		       low, high, low_tpt, high_tpt);
2215 
2216 	scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2217 					  current_tpt, low_tpt, high_tpt);
2218 
2219 	/* Force a search in case BT doesn't like us being in MIMO */
2220 	if (is_mimo(rate) &&
2221 	    !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2222 		IWL_DEBUG_RATE(mvm,
2223 			       "BT Coex forbids MIMO. Search for new config\n");
2224 		rs_stay_in_table(lq_sta, true);
2225 		goto lq_update;
2226 	}
2227 
2228 	switch (scale_action) {
2229 	case RS_ACTION_DOWNSCALE:
2230 		/* Decrease starting rate, update uCode's rate table */
2231 		if (low != IWL_RATE_INVALID) {
2232 			update_lq = 1;
2233 			index = low;
2234 		} else {
2235 			IWL_DEBUG_RATE(mvm,
2236 				       "At the bottom rate. Can't decrease\n");
2237 		}
2238 
2239 		break;
2240 	case RS_ACTION_UPSCALE:
2241 		/* Increase starting rate, update uCode's rate table */
2242 		if (high != IWL_RATE_INVALID) {
2243 			update_lq = 1;
2244 			index = high;
2245 		} else {
2246 			IWL_DEBUG_RATE(mvm,
2247 				       "At the top rate. Can't increase\n");
2248 		}
2249 
2250 		break;
2251 	case RS_ACTION_STAY:
2252 		/* No change */
2253 		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2254 			update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2255 		break;
2256 	default:
2257 		break;
2258 	}
2259 
2260 lq_update:
2261 	/* Replace uCode's rate table for the destination station. */
2262 	if (update_lq) {
2263 		tbl->rate.index = index;
2264 		if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2265 			rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2266 		rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2267 		rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2268 	}
2269 
2270 	rs_stay_in_table(lq_sta, false);
2271 
2272 	/*
2273 	 * Search for new modulation mode if we're:
2274 	 * 1)  Not changing rates right now
2275 	 * 2)  Not just finishing up a search
2276 	 * 3)  Allowing a new search
2277 	 */
2278 	if (!update_lq && !done_search &&
2279 	    lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2280 	    && window->counter) {
2281 		enum rs_column next_column;
2282 
2283 		/* Save current throughput to compare with "search" throughput*/
2284 		lq_sta->last_tpt = current_tpt;
2285 
2286 		IWL_DEBUG_RATE(mvm,
2287 			       "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2288 			       update_lq, done_search, lq_sta->rs_state,
2289 			       window->counter);
2290 
2291 		next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2292 		if (next_column != RS_COLUMN_INVALID) {
2293 			int ret = rs_switch_to_column(mvm, lq_sta, sta,
2294 						      next_column);
2295 			if (!ret)
2296 				lq_sta->search_better_tbl = 1;
2297 		} else {
2298 			IWL_DEBUG_RATE(mvm,
2299 				       "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2300 			lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2301 		}
2302 
2303 		/* If new "search" mode was selected, set up in uCode table */
2304 		if (lq_sta->search_better_tbl) {
2305 			/* Access the "search" table, clear its history. */
2306 			tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2307 			rs_rate_scale_clear_tbl_windows(mvm, tbl);
2308 
2309 			/* Use new "search" start rate */
2310 			index = tbl->rate.index;
2311 
2312 			rs_dump_rate(mvm, &tbl->rate,
2313 				     "Switch to SEARCH TABLE:");
2314 			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2315 		} else {
2316 			done_search = 1;
2317 		}
2318 	}
2319 
2320 	if (!ndp)
2321 		rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2322 
2323 	if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2324 		tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2325 		rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2326 	}
2327 }
2328 
2329 struct rs_init_rate_info {
2330 	s8 rssi;
2331 	u8 rate_idx;
2332 };
2333 
2334 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2335 	{ -60, IWL_RATE_54M_INDEX },
2336 	{ -64, IWL_RATE_48M_INDEX },
2337 	{ -68, IWL_RATE_36M_INDEX },
2338 	{ -80, IWL_RATE_24M_INDEX },
2339 	{ -84, IWL_RATE_18M_INDEX },
2340 	{ -85, IWL_RATE_12M_INDEX },
2341 	{ -86, IWL_RATE_11M_INDEX },
2342 	{ -88, IWL_RATE_5M_INDEX  },
2343 	{ -90, IWL_RATE_2M_INDEX  },
2344 	{ S8_MIN, IWL_RATE_1M_INDEX },
2345 };
2346 
2347 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2348 	{ -60, IWL_RATE_54M_INDEX },
2349 	{ -64, IWL_RATE_48M_INDEX },
2350 	{ -72, IWL_RATE_36M_INDEX },
2351 	{ -80, IWL_RATE_24M_INDEX },
2352 	{ -84, IWL_RATE_18M_INDEX },
2353 	{ -85, IWL_RATE_12M_INDEX },
2354 	{ -87, IWL_RATE_9M_INDEX  },
2355 	{ S8_MIN, IWL_RATE_6M_INDEX },
2356 };
2357 
2358 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2359 	{ -60, IWL_RATE_MCS_7_INDEX },
2360 	{ -64, IWL_RATE_MCS_6_INDEX },
2361 	{ -68, IWL_RATE_MCS_5_INDEX },
2362 	{ -72, IWL_RATE_MCS_4_INDEX },
2363 	{ -80, IWL_RATE_MCS_3_INDEX },
2364 	{ -84, IWL_RATE_MCS_2_INDEX },
2365 	{ -85, IWL_RATE_MCS_1_INDEX },
2366 	{ S8_MIN, IWL_RATE_MCS_0_INDEX},
2367 };
2368 
2369 /* MCS index 9 is not valid for 20MHz VHT channel width,
2370  * but is ok for 40, 80 and 160MHz channels.
2371  */
2372 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2373 	{ -60, IWL_RATE_MCS_8_INDEX },
2374 	{ -64, IWL_RATE_MCS_7_INDEX },
2375 	{ -68, IWL_RATE_MCS_6_INDEX },
2376 	{ -72, IWL_RATE_MCS_5_INDEX },
2377 	{ -80, IWL_RATE_MCS_4_INDEX },
2378 	{ -84, IWL_RATE_MCS_3_INDEX },
2379 	{ -85, IWL_RATE_MCS_2_INDEX },
2380 	{ -87, IWL_RATE_MCS_1_INDEX },
2381 	{ S8_MIN, IWL_RATE_MCS_0_INDEX},
2382 };
2383 
2384 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2385 	{ -60, IWL_RATE_MCS_9_INDEX },
2386 	{ -64, IWL_RATE_MCS_8_INDEX },
2387 	{ -68, IWL_RATE_MCS_7_INDEX },
2388 	{ -72, IWL_RATE_MCS_6_INDEX },
2389 	{ -80, IWL_RATE_MCS_5_INDEX },
2390 	{ -84, IWL_RATE_MCS_4_INDEX },
2391 	{ -85, IWL_RATE_MCS_3_INDEX },
2392 	{ -87, IWL_RATE_MCS_2_INDEX },
2393 	{ -88, IWL_RATE_MCS_1_INDEX },
2394 	{ S8_MIN, IWL_RATE_MCS_0_INDEX },
2395 };
2396 
2397 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2398 
2399 /* Init the optimal rate based on STA caps
2400  * This combined with rssi is used to report the last tx rate
2401  * to userspace when we haven't transmitted enough frames.
2402  */
rs_init_optimal_rate(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)2403 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2404 				 struct ieee80211_sta *sta,
2405 				 struct iwl_lq_sta *lq_sta)
2406 {
2407 	struct rs_rate *rate = &lq_sta->optimal_rate;
2408 
2409 	if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2410 		rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2411 	else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2412 		rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2413 	else if (lq_sta->band == NL80211_BAND_5GHZ)
2414 		rate->type = LQ_LEGACY_A;
2415 	else
2416 		rate->type = LQ_LEGACY_G;
2417 
2418 	rate->bw = rs_bw_from_sta_bw(sta);
2419 	rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2420 
2421 	/* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2422 
2423 	if (is_mimo(rate)) {
2424 		lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2425 	} else if (is_siso(rate)) {
2426 		lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2427 	} else {
2428 		lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2429 
2430 		if (lq_sta->band == NL80211_BAND_5GHZ) {
2431 			lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2432 			lq_sta->optimal_nentries =
2433 				ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2434 		} else {
2435 			lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2436 			lq_sta->optimal_nentries =
2437 				ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2438 		}
2439 	}
2440 
2441 	if (is_vht(rate)) {
2442 		if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2443 			lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2444 			lq_sta->optimal_nentries =
2445 				ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2446 		} else {
2447 			lq_sta->optimal_rates = rs_optimal_rates_vht;
2448 			lq_sta->optimal_nentries =
2449 				ARRAY_SIZE(rs_optimal_rates_vht);
2450 		}
2451 	} else if (is_ht(rate)) {
2452 		lq_sta->optimal_rates = rs_optimal_rates_ht;
2453 		lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2454 	}
2455 }
2456 
2457 /* Compute the optimal rate index based on RSSI */
rs_get_optimal_rate(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta)2458 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2459 					   struct iwl_lq_sta *lq_sta)
2460 {
2461 	struct rs_rate *rate = &lq_sta->optimal_rate;
2462 	int i;
2463 
2464 	rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2465 				     BITS_PER_LONG);
2466 
2467 	for (i = 0; i < lq_sta->optimal_nentries; i++) {
2468 		int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2469 
2470 		if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2471 		    (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2472 			rate->index = rate_idx;
2473 			break;
2474 		}
2475 	}
2476 
2477 	return rate;
2478 }
2479 
2480 /* Choose an initial legacy rate and antenna to use based on the RSSI
2481  * of last Rx
2482  */
rs_get_initial_rate(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,enum nl80211_band band,struct rs_rate * rate)2483 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2484 				struct ieee80211_sta *sta,
2485 				struct iwl_lq_sta *lq_sta,
2486 				enum nl80211_band band,
2487 				struct rs_rate *rate)
2488 {
2489 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2490 	int i, nentries;
2491 	unsigned long active_rate;
2492 	s8 best_rssi = S8_MIN;
2493 	u8 best_ant = ANT_NONE;
2494 	u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2495 	const struct rs_init_rate_info *initial_rates;
2496 
2497 	for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2498 		if (!(lq_sta->pers.chains & BIT(i)))
2499 			continue;
2500 
2501 		if (lq_sta->pers.chain_signal[i] > best_rssi) {
2502 			best_rssi = lq_sta->pers.chain_signal[i];
2503 			best_ant = BIT(i);
2504 		}
2505 	}
2506 
2507 	IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2508 		       iwl_rs_pretty_ant(best_ant), best_rssi);
2509 
2510 	if (best_ant != ANT_A && best_ant != ANT_B)
2511 		rate->ant = first_antenna(valid_tx_ant);
2512 	else
2513 		rate->ant = best_ant;
2514 
2515 	rate->sgi = false;
2516 	rate->ldpc = false;
2517 	rate->bw = RATE_MCS_CHAN_WIDTH_20;
2518 
2519 	rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2520 				     BITS_PER_LONG);
2521 
2522 	if (band == NL80211_BAND_5GHZ) {
2523 		rate->type = LQ_LEGACY_A;
2524 		initial_rates = rs_optimal_rates_5ghz_legacy;
2525 		nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2526 	} else {
2527 		rate->type = LQ_LEGACY_G;
2528 		initial_rates = rs_optimal_rates_24ghz_legacy;
2529 		nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2530 	}
2531 
2532 	if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2533 		goto out;
2534 
2535 	/* Start from a higher rate if the corresponding debug capability
2536 	 * is enabled. The rate is chosen according to AP capabilities.
2537 	 * In case of VHT/HT when the rssi is low fallback to the case of
2538 	 * legacy rates.
2539 	 */
2540 	if (sta->deflink.vht_cap.vht_supported &&
2541 	    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2542 		/*
2543 		 * In AP mode, when a new station associates, rs is initialized
2544 		 * immediately upon association completion, before the phy
2545 		 * context is updated with the association parameters, so the
2546 		 * sta bandwidth might be wider than the phy context allows.
2547 		 * To avoid this issue, always initialize rs with 20mhz
2548 		 * bandwidth rate, and after authorization, when the phy context
2549 		 * is already up-to-date, re-init rs with the correct bw.
2550 		 */
2551 		u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2552 				RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2553 
2554 		switch (bw) {
2555 		case RATE_MCS_CHAN_WIDTH_40:
2556 		case RATE_MCS_CHAN_WIDTH_80:
2557 		case RATE_MCS_CHAN_WIDTH_160:
2558 			initial_rates = rs_optimal_rates_vht;
2559 			nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2560 			break;
2561 		case RATE_MCS_CHAN_WIDTH_20:
2562 			initial_rates = rs_optimal_rates_vht_20mhz;
2563 			nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2564 			break;
2565 		default:
2566 			IWL_ERR(mvm, "Invalid BW %d\n",
2567 				sta->deflink.bandwidth);
2568 			goto out;
2569 		}
2570 
2571 		active_rate = lq_sta->active_siso_rate;
2572 		rate->type = LQ_VHT_SISO;
2573 		rate->bw = bw;
2574 	} else if (sta->deflink.ht_cap.ht_supported &&
2575 		   best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2576 		initial_rates = rs_optimal_rates_ht;
2577 		nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2578 		active_rate = lq_sta->active_siso_rate;
2579 		rate->type = LQ_HT_SISO;
2580 	} else {
2581 		active_rate = lq_sta->active_legacy_rate;
2582 	}
2583 
2584 	for (i = 0; i < nentries; i++) {
2585 		int rate_idx = initial_rates[i].rate_idx;
2586 
2587 		if ((best_rssi >= initial_rates[i].rssi) &&
2588 		    (BIT(rate_idx) & active_rate)) {
2589 			rate->index = rate_idx;
2590 			break;
2591 		}
2592 	}
2593 
2594 out:
2595 	rs_dump_rate(mvm, rate, "INITIAL");
2596 }
2597 
2598 /* Save info about RSSI of last Rx */
rs_update_last_rssi(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,struct ieee80211_rx_status * rx_status)2599 void rs_update_last_rssi(struct iwl_mvm *mvm,
2600 			 struct iwl_mvm_sta *mvmsta,
2601 			 struct ieee80211_rx_status *rx_status)
2602 {
2603 	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2604 	int i;
2605 
2606 	lq_sta->pers.chains = rx_status->chains;
2607 	lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2608 	lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2609 	lq_sta->pers.last_rssi = S8_MIN;
2610 
2611 	for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2612 		if (!(lq_sta->pers.chains & BIT(i)))
2613 			continue;
2614 
2615 		if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2616 			lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2617 	}
2618 }
2619 
2620 /*
2621  * rs_initialize_lq - Initialize a station's hardware rate table
2622  *
2623  * The uCode's station table contains a table of fallback rates
2624  * for automatic fallback during transmission.
2625  *
2626  * NOTE: This sets up a default set of values.  These will be replaced later
2627  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2628  *       rc80211_simple.
2629  *
2630  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2631  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2632  *       which requires station table entry to exist).
2633  */
rs_initialize_lq(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,enum nl80211_band band)2634 static void rs_initialize_lq(struct iwl_mvm *mvm,
2635 			     struct ieee80211_sta *sta,
2636 			     struct iwl_lq_sta *lq_sta,
2637 			     enum nl80211_band band)
2638 {
2639 	struct iwl_scale_tbl_info *tbl;
2640 	struct rs_rate *rate;
2641 	u8 active_tbl = 0;
2642 
2643 	if (!sta || !lq_sta)
2644 		return;
2645 
2646 	if (!lq_sta->search_better_tbl)
2647 		active_tbl = lq_sta->active_tbl;
2648 	else
2649 		active_tbl = rs_search_tbl(lq_sta->active_tbl);
2650 
2651 	tbl = &(lq_sta->lq_info[active_tbl]);
2652 	rate = &tbl->rate;
2653 
2654 	rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2655 	rs_init_optimal_rate(mvm, sta, lq_sta);
2656 
2657 	WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2658 		  "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2659 		  rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2660 		  mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2661 
2662 	tbl->column = rs_get_column_from_rate(rate);
2663 
2664 	rs_set_expected_tpt_table(lq_sta, tbl);
2665 	rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2666 	/* TODO restore station should remember the lq cmd */
2667 	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2668 }
2669 
rs_drv_get_rate(void * mvm_r,struct ieee80211_sta * sta,void * mvm_sta,struct ieee80211_tx_rate_control * txrc)2670 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2671 			    void *mvm_sta,
2672 			    struct ieee80211_tx_rate_control *txrc)
2673 {
2674 	struct iwl_op_mode *op_mode = mvm_r;
2675 	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2676 	struct sk_buff *skb = txrc->skb;
2677 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2678 	struct iwl_lq_sta *lq_sta;
2679 	struct rs_rate *optimal_rate;
2680 	u32 last_ucode_rate;
2681 
2682 	if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2683 		/* if vif isn't initialized mvm doesn't know about
2684 		 * this station, so don't do anything with the it
2685 		 */
2686 		sta = NULL;
2687 		mvm_sta = NULL;
2688 	}
2689 
2690 	if (!mvm_sta)
2691 		return;
2692 
2693 	lq_sta = mvm_sta;
2694 	iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags,
2695 				     info->band, &info->control.rates[0]);
2696 	info->control.rates[0].count = 1;
2697 
2698 	/* Report the optimal rate based on rssi and STA caps if we haven't
2699 	 * converged yet (too little traffic) or exploring other modulations
2700 	 */
2701 	if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2702 		optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2703 		last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2704 							  optimal_rate);
2705 		iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band,
2706 					     &txrc->reported_rate);
2707 	}
2708 }
2709 
rs_drv_alloc_sta(void * mvm_rate,struct ieee80211_sta * sta,gfp_t gfp)2710 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2711 			      gfp_t gfp)
2712 {
2713 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2714 	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2715 	struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2716 	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2717 
2718 	IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2719 
2720 	lq_sta->pers.drv = mvm;
2721 #ifdef CONFIG_MAC80211_DEBUGFS
2722 	lq_sta->pers.dbg_fixed_rate = 0;
2723 	lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2724 	lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2725 #endif
2726 	lq_sta->pers.chains = 0;
2727 	memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2728 	lq_sta->pers.last_rssi = S8_MIN;
2729 
2730 	return lq_sta;
2731 }
2732 
rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap * vht_cap,int nss)2733 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2734 				       int nss)
2735 {
2736 	u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2737 		(0x3 << (2 * (nss - 1)));
2738 	rx_mcs >>= (2 * (nss - 1));
2739 
2740 	if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2741 		return IWL_RATE_MCS_7_INDEX;
2742 	else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2743 		return IWL_RATE_MCS_8_INDEX;
2744 	else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2745 		return IWL_RATE_MCS_9_INDEX;
2746 
2747 	WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2748 	return -1;
2749 }
2750 
rs_vht_set_enabled_rates(struct ieee80211_sta * sta,struct ieee80211_sta_vht_cap * vht_cap,struct iwl_lq_sta * lq_sta)2751 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2752 				     struct ieee80211_sta_vht_cap *vht_cap,
2753 				     struct iwl_lq_sta *lq_sta)
2754 {
2755 	int i;
2756 	int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2757 
2758 	if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2759 		for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2760 			if (i == IWL_RATE_9M_INDEX)
2761 				continue;
2762 
2763 			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2764 			if (i == IWL_RATE_MCS_9_INDEX &&
2765 			    sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2766 				continue;
2767 
2768 			lq_sta->active_siso_rate |= BIT(i);
2769 		}
2770 	}
2771 
2772 	if (sta->deflink.rx_nss < 2)
2773 		return;
2774 
2775 	highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2776 	if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2777 		for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2778 			if (i == IWL_RATE_9M_INDEX)
2779 				continue;
2780 
2781 			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2782 			if (i == IWL_RATE_MCS_9_INDEX &&
2783 			    sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2784 				continue;
2785 
2786 			lq_sta->active_mimo2_rate |= BIT(i);
2787 		}
2788 	}
2789 }
2790 
rs_ht_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct ieee80211_sta_ht_cap * ht_cap)2791 static void rs_ht_init(struct iwl_mvm *mvm,
2792 		       struct ieee80211_sta *sta,
2793 		       struct iwl_lq_sta *lq_sta,
2794 		       struct ieee80211_sta_ht_cap *ht_cap)
2795 {
2796 	/* active_siso_rate mask includes 9 MBits (bit 5),
2797 	 * and CCK (bits 0-3), supp_rates[] does not;
2798 	 * shift to convert format, force 9 MBits off.
2799 	 */
2800 	lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2801 	lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2802 	lq_sta->active_siso_rate &= ~((u16)0x2);
2803 	lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2804 
2805 	lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2806 	lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2807 	lq_sta->active_mimo2_rate &= ~((u16)0x2);
2808 	lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2809 
2810 	if (mvm->cfg->ht_params->ldpc &&
2811 	    (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2812 		lq_sta->ldpc = true;
2813 
2814 	if (mvm->cfg->ht_params->stbc &&
2815 	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2816 	    (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2817 		lq_sta->stbc_capable = true;
2818 
2819 	lq_sta->is_vht = false;
2820 }
2821 
rs_vht_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct ieee80211_sta_vht_cap * vht_cap)2822 static void rs_vht_init(struct iwl_mvm *mvm,
2823 			struct ieee80211_sta *sta,
2824 			struct iwl_lq_sta *lq_sta,
2825 			struct ieee80211_sta_vht_cap *vht_cap)
2826 {
2827 	rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2828 
2829 	if (mvm->cfg->ht_params->ldpc &&
2830 	    (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2831 		lq_sta->ldpc = true;
2832 
2833 	if (mvm->cfg->ht_params->stbc &&
2834 	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2835 	    (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2836 		lq_sta->stbc_capable = true;
2837 
2838 	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2839 	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2840 	    (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2841 		lq_sta->bfer_capable = true;
2842 
2843 	lq_sta->is_vht = true;
2844 }
2845 
2846 #ifdef CONFIG_IWLWIFI_DEBUGFS
iwl_mvm_reset_frame_stats(struct iwl_mvm * mvm)2847 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2848 {
2849 	spin_lock_bh(&mvm->drv_stats_lock);
2850 	memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2851 	spin_unlock_bh(&mvm->drv_stats_lock);
2852 }
2853 
iwl_mvm_update_frame_stats(struct iwl_mvm * mvm,u32 rate,bool agg)2854 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2855 {
2856 	u8 nss = 0;
2857 
2858 	spin_lock(&mvm->drv_stats_lock);
2859 
2860 	if (agg)
2861 		mvm->drv_rx_stats.agg_frames++;
2862 
2863 	mvm->drv_rx_stats.success_frames++;
2864 
2865 	switch (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) {
2866 	case RATE_MCS_CHAN_WIDTH_20:
2867 		mvm->drv_rx_stats.bw_20_frames++;
2868 		break;
2869 	case RATE_MCS_CHAN_WIDTH_40:
2870 		mvm->drv_rx_stats.bw_40_frames++;
2871 		break;
2872 	case RATE_MCS_CHAN_WIDTH_80:
2873 		mvm->drv_rx_stats.bw_80_frames++;
2874 		break;
2875 	case RATE_MCS_CHAN_WIDTH_160:
2876 		mvm->drv_rx_stats.bw_160_frames++;
2877 		break;
2878 	default:
2879 		WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2880 	}
2881 
2882 	if (rate & RATE_MCS_HT_MSK_V1) {
2883 		mvm->drv_rx_stats.ht_frames++;
2884 		nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) >> RATE_HT_MCS_NSS_POS_V1) + 1;
2885 	} else if (rate & RATE_MCS_VHT_MSK_V1) {
2886 		mvm->drv_rx_stats.vht_frames++;
2887 		nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2888 		       RATE_VHT_MCS_NSS_POS) + 1;
2889 	} else {
2890 		mvm->drv_rx_stats.legacy_frames++;
2891 	}
2892 
2893 	if (nss == 1)
2894 		mvm->drv_rx_stats.siso_frames++;
2895 	else if (nss == 2)
2896 		mvm->drv_rx_stats.mimo2_frames++;
2897 
2898 	if (rate & RATE_MCS_SGI_MSK_V1)
2899 		mvm->drv_rx_stats.sgi_frames++;
2900 	else
2901 		mvm->drv_rx_stats.ngi_frames++;
2902 
2903 	mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2904 	mvm->drv_rx_stats.last_frame_idx =
2905 		(mvm->drv_rx_stats.last_frame_idx + 1) %
2906 			ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2907 
2908 	spin_unlock(&mvm->drv_stats_lock);
2909 }
2910 #endif
2911 
2912 /*
2913  * Called after adding a new station to initialize rate scaling
2914  */
rs_drv_rate_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,enum nl80211_band band)2915 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2916 			     enum nl80211_band band)
2917 {
2918 	int i, j;
2919 	struct ieee80211_hw *hw = mvm->hw;
2920 	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2921 	struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
2922 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2923 	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2924 	struct ieee80211_supported_band *sband;
2925 	unsigned long supp; /* must be unsigned long for for_each_set_bit */
2926 
2927 	lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock);
2928 
2929 	/* clear all non-persistent lq data */
2930 	memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2931 
2932 	sband = hw->wiphy->bands[band];
2933 
2934 	lq_sta->lq.sta_id = mvmsta->sta_id;
2935 	mvmsta->amsdu_enabled = 0;
2936 	mvmsta->max_amsdu_len = sta->max_amsdu_len;
2937 
2938 	for (j = 0; j < LQ_SIZE; j++)
2939 		rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2940 
2941 	lq_sta->flush_timer = 0;
2942 	lq_sta->last_tx = jiffies;
2943 
2944 	IWL_DEBUG_RATE(mvm,
2945 		       "LQ: *** rate scale station global init for station %d ***\n",
2946 		       mvmsta->sta_id);
2947 	/* TODO: what is a good starting rate for STA? About middle? Maybe not
2948 	 * the lowest or the highest rate.. Could consider using RSSI from
2949 	 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2950 	 * after assoc.. */
2951 
2952 	lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2953 	lq_sta->band = sband->band;
2954 	/*
2955 	 * active legacy rates as per supported rates bitmap
2956 	 */
2957 	supp = sta->deflink.supp_rates[sband->band];
2958 	lq_sta->active_legacy_rate = 0;
2959 	for_each_set_bit(i, &supp, BITS_PER_LONG)
2960 		lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2961 
2962 	/* TODO: should probably account for rx_highest for both HT/VHT */
2963 	if (!vht_cap || !vht_cap->vht_supported)
2964 		rs_ht_init(mvm, sta, lq_sta, ht_cap);
2965 	else
2966 		rs_vht_init(mvm, sta, lq_sta, vht_cap);
2967 
2968 	lq_sta->max_legacy_rate_idx =
2969 		rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2970 	lq_sta->max_siso_rate_idx =
2971 		rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2972 	lq_sta->max_mimo2_rate_idx =
2973 		rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2974 
2975 	IWL_DEBUG_RATE(mvm,
2976 		       "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2977 		       lq_sta->active_legacy_rate,
2978 		       lq_sta->active_siso_rate,
2979 		       lq_sta->active_mimo2_rate,
2980 		       lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2981 		       lq_sta->bfer_capable);
2982 	IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2983 		       lq_sta->max_legacy_rate_idx,
2984 		       lq_sta->max_siso_rate_idx,
2985 		       lq_sta->max_mimo2_rate_idx);
2986 
2987 	/* These values will be overridden later */
2988 	lq_sta->lq.single_stream_ant_msk =
2989 		iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
2990 	lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2991 
2992 	/* as default allow aggregation for all tids */
2993 	lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2994 	lq_sta->is_agg = 0;
2995 #ifdef CONFIG_IWLWIFI_DEBUGFS
2996 	iwl_mvm_reset_frame_stats(mvm);
2997 #endif
2998 	rs_initialize_lq(mvm, sta, lq_sta, band);
2999 }
3000 
rs_drv_rate_update(void * mvm_r,struct ieee80211_supported_band * sband,struct cfg80211_chan_def * chandef,struct ieee80211_sta * sta,void * priv_sta,u32 changed)3001 static void rs_drv_rate_update(void *mvm_r,
3002 			       struct ieee80211_supported_band *sband,
3003 			       struct cfg80211_chan_def *chandef,
3004 			       struct ieee80211_sta *sta,
3005 			       void *priv_sta, u32 changed)
3006 {
3007 	struct iwl_op_mode *op_mode = mvm_r;
3008 	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3009 	u8 tid;
3010 
3011 	if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3012 		return;
3013 
3014 	/* Stop any ongoing aggregations as rs starts off assuming no agg */
3015 	for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3016 		ieee80211_stop_tx_ba_session(sta, tid);
3017 
3018 	iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3019 }
3020 
__iwl_mvm_rs_tx_status(struct iwl_mvm * mvm,struct ieee80211_sta * sta,int tid,struct ieee80211_tx_info * info,bool ndp)3021 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3022 				   struct ieee80211_sta *sta,
3023 				   int tid, struct ieee80211_tx_info *info,
3024 				   bool ndp)
3025 {
3026 	int legacy_success;
3027 	int retries;
3028 	int i;
3029 	struct iwl_lq_cmd *table;
3030 	u32 lq_hwrate;
3031 	struct rs_rate lq_rate, tx_resp_rate;
3032 	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3033 	u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3034 	u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3035 	u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3036 	u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3037 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3038 	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3039 
3040 	if (!lq_sta->pers.drv) {
3041 		IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3042 		return;
3043 	}
3044 
3045 	/* This packet was aggregated but doesn't carry status info */
3046 	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3047 	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
3048 		return;
3049 
3050 	if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3051 				    &tx_resp_rate)) {
3052 		WARN_ON_ONCE(1);
3053 		return;
3054 	}
3055 
3056 #ifdef CONFIG_MAC80211_DEBUGFS
3057 	/* Disable last tx check if we are debugging with fixed rate but
3058 	 * update tx stats
3059 	 */
3060 	if (lq_sta->pers.dbg_fixed_rate) {
3061 		int index = tx_resp_rate.index;
3062 		enum rs_column column;
3063 		int attempts, success;
3064 
3065 		column = rs_get_column_from_rate(&tx_resp_rate);
3066 		if (WARN_ONCE(column == RS_COLUMN_INVALID,
3067 			      "Can't map rate 0x%x to column",
3068 			      tx_resp_hwrate))
3069 			return;
3070 
3071 		if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3072 			attempts = info->status.ampdu_len;
3073 			success = info->status.ampdu_ack_len;
3074 		} else {
3075 			attempts = info->status.rates[0].count;
3076 			success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3077 		}
3078 
3079 		lq_sta->pers.tx_stats[column][index].total += attempts;
3080 		lq_sta->pers.tx_stats[column][index].success += success;
3081 
3082 		IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3083 			       tx_resp_hwrate, success, attempts);
3084 		return;
3085 	}
3086 #endif
3087 
3088 	if (time_after(jiffies,
3089 		       (unsigned long)(lq_sta->last_tx +
3090 				       (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3091 		IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3092 		/* reach here only in case of driver RS, call directly
3093 		 * the unlocked version
3094 		 */
3095 		rs_drv_rate_init(mvm, sta, info->band);
3096 		return;
3097 	}
3098 	lq_sta->last_tx = jiffies;
3099 
3100 	/* Ignore this Tx frame response if its initial rate doesn't match
3101 	 * that of latest Link Quality command.  There may be stragglers
3102 	 * from a previous Link Quality command, but we're no longer interested
3103 	 * in those; they're either from the "active" mode while we're trying
3104 	 * to check "search" mode, or a prior "search" mode after we've moved
3105 	 * to a new "search" mode (which might become the new "active" mode).
3106 	 */
3107 	table = &lq_sta->lq;
3108 	lq_hwrate = le32_to_cpu(table->rs_table[0]);
3109 	if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3110 		WARN_ON_ONCE(1);
3111 		return;
3112 	}
3113 
3114 	/* Here we actually compare this rate to the latest LQ command */
3115 	if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3116 		IWL_DEBUG_RATE(mvm,
3117 			       "tx resp color 0x%x does not match 0x%x\n",
3118 			       lq_color, LQ_FLAG_COLOR_GET(table->flags));
3119 
3120 		/* Since rates mis-match, the last LQ command may have failed.
3121 		 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3122 		 * ... driver.
3123 		 */
3124 		lq_sta->missed_rate_counter++;
3125 		if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3126 			lq_sta->missed_rate_counter = 0;
3127 			IWL_DEBUG_RATE(mvm,
3128 				       "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3129 				       lq_sta->rs_state);
3130 			iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3131 		}
3132 		/* Regardless, ignore this status info for outdated rate */
3133 		return;
3134 	}
3135 
3136 	/* Rate did match, so reset the missed_rate_counter */
3137 	lq_sta->missed_rate_counter = 0;
3138 
3139 	if (!lq_sta->search_better_tbl) {
3140 		curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3141 		other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3142 	} else {
3143 		curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3144 		other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3145 	}
3146 
3147 	if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3148 		IWL_DEBUG_RATE(mvm,
3149 			       "Neither active nor search matches tx rate\n");
3150 		tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3151 		rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3152 		tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3153 		rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3154 		rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3155 
3156 		/* no matching table found, let's by-pass the data collection
3157 		 * and continue to perform rate scale to find the rate table
3158 		 */
3159 		rs_stay_in_table(lq_sta, true);
3160 		goto done;
3161 	}
3162 
3163 	/* Updating the frame history depends on whether packets were
3164 	 * aggregated.
3165 	 *
3166 	 * For aggregation, all packets were transmitted at the same rate, the
3167 	 * first index into rate scale table.
3168 	 */
3169 	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3170 		rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3171 				    info->status.ampdu_len,
3172 				    info->status.ampdu_ack_len,
3173 				    reduced_txp);
3174 
3175 		/* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3176 		 * it as a single frame loss as we don't want the success ratio
3177 		 * to dip too quickly because a BA wasn't received.
3178 		 * For TPC, there's no need for this optimisation since we want
3179 		 * to recover very quickly from a bad power reduction and,
3180 		 * therefore we'd like the success ratio to get an immediate hit
3181 		 * when failing to get a BA, so we'd switch back to a lower or
3182 		 * zero power reduction. When FW transmits agg with a rate
3183 		 * different from the initial rate, it will not use reduced txp
3184 		 * and will send BA notification twice (one empty with reduced
3185 		 * txp equal to the value from LQ and one with reduced txp 0).
3186 		 * We need to update counters for each txp level accordingly.
3187 		 */
3188 		if (info->status.ampdu_ack_len == 0)
3189 			info->status.ampdu_len = 1;
3190 
3191 		rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3192 				    tx_resp_rate.index,
3193 				    info->status.ampdu_len,
3194 				    info->status.ampdu_ack_len);
3195 
3196 		/* Update success/fail counts if not searching for new mode */
3197 		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3198 			lq_sta->total_success += info->status.ampdu_ack_len;
3199 			lq_sta->total_failed += (info->status.ampdu_len -
3200 					info->status.ampdu_ack_len);
3201 		}
3202 	} else {
3203 		/* For legacy, update frame history with for each Tx retry. */
3204 		retries = info->status.rates[0].count - 1;
3205 		/* HW doesn't send more than 15 retries */
3206 		retries = min(retries, 15);
3207 
3208 		/* The last transmission may have been successful */
3209 		legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3210 		/* Collect data for each rate used during failed TX attempts */
3211 		for (i = 0; i <= retries; ++i) {
3212 			lq_hwrate = le32_to_cpu(table->rs_table[i]);
3213 			if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3214 						    &lq_rate)) {
3215 				WARN_ON_ONCE(1);
3216 				return;
3217 			}
3218 
3219 			/* Only collect stats if retried rate is in the same RS
3220 			 * table as active/search.
3221 			 */
3222 			if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3223 				tmp_tbl = curr_tbl;
3224 			else if (rs_rate_column_match(&lq_rate,
3225 						      &other_tbl->rate))
3226 				tmp_tbl = other_tbl;
3227 			else
3228 				continue;
3229 
3230 			rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3231 					    tx_resp_rate.index, 1,
3232 					    i < retries ? 0 : legacy_success,
3233 					    reduced_txp);
3234 			rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3235 					    tx_resp_rate.index, 1,
3236 					    i < retries ? 0 : legacy_success);
3237 		}
3238 
3239 		/* Update success/fail counts if not searching for new mode */
3240 		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3241 			lq_sta->total_success += legacy_success;
3242 			lq_sta->total_failed += retries + (1 - legacy_success);
3243 		}
3244 	}
3245 	/* The last TX rate is cached in lq_sta; it's set in if/else above */
3246 	lq_sta->last_rate_n_flags = lq_hwrate;
3247 	IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3248 done:
3249 	/* See if there's a better rate or modulation mode to try. */
3250 	if (sta->deflink.supp_rates[info->band])
3251 		rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3252 }
3253 
iwl_mvm_rs_tx_status(struct iwl_mvm * mvm,struct ieee80211_sta * sta,int tid,struct ieee80211_tx_info * info,bool ndp)3254 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3255 			  int tid, struct ieee80211_tx_info *info, bool ndp)
3256 {
3257 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3258 
3259 	/* If it's locked we are in middle of init flow
3260 	 * just wait for next tx status to update the lq_sta data
3261 	 */
3262 	if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock))
3263 		return;
3264 
3265 	__iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3266 	spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
3267 }
3268 
3269 #ifdef CONFIG_MAC80211_DEBUGFS
rs_build_rates_table_from_fixed(struct iwl_mvm * mvm,struct iwl_lq_cmd * lq_cmd,enum nl80211_band band,u32 ucode_rate)3270 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3271 					    struct iwl_lq_cmd *lq_cmd,
3272 					    enum nl80211_band band,
3273 					    u32 ucode_rate)
3274 {
3275 	struct rs_rate rate;
3276 	int i;
3277 	int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3278 	__le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3279 	u8 ant = (ucode_rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3280 
3281 	for (i = 0; i < num_rates; i++)
3282 		lq_cmd->rs_table[i] = ucode_rate_le32;
3283 
3284 	if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3285 		WARN_ON_ONCE(1);
3286 		return;
3287 	}
3288 
3289 	if (is_mimo(&rate))
3290 		lq_cmd->mimo_delim = num_rates - 1;
3291 	else
3292 		lq_cmd->mimo_delim = 0;
3293 
3294 	lq_cmd->reduced_tpc = 0;
3295 
3296 	if (num_of_ant(ant) == 1)
3297 		lq_cmd->single_stream_ant_msk = ant;
3298 
3299 	if (!mvm->trans->trans_cfg->gen2)
3300 		lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3301 	else
3302 		lq_cmd->agg_frame_cnt_limit =
3303 			LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3304 }
3305 #endif /* CONFIG_MAC80211_DEBUGFS */
3306 
rs_fill_rates_for_column(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct rs_rate * rate,__le32 * rs_table,int * rs_table_index,int num_rates,int num_retries,u8 valid_tx_ant,bool toggle_ant)3307 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3308 				     struct iwl_lq_sta *lq_sta,
3309 				     struct rs_rate *rate,
3310 				     __le32 *rs_table, int *rs_table_index,
3311 				     int num_rates, int num_retries,
3312 				     u8 valid_tx_ant, bool toggle_ant)
3313 {
3314 	int i, j;
3315 	__le32 ucode_rate;
3316 	bool bottom_reached = false;
3317 	int prev_rate_idx = rate->index;
3318 	int end = LINK_QUAL_MAX_RETRY_NUM;
3319 	int index = *rs_table_index;
3320 
3321 	for (i = 0; i < num_rates && index < end; i++) {
3322 		for (j = 0; j < num_retries && index < end; j++, index++) {
3323 			ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3324 									 rate));
3325 			rs_table[index] = ucode_rate;
3326 			if (toggle_ant)
3327 				rs_toggle_antenna(valid_tx_ant, rate);
3328 		}
3329 
3330 		prev_rate_idx = rate->index;
3331 		bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3332 		if (bottom_reached && !is_legacy(rate))
3333 			break;
3334 	}
3335 
3336 	if (!bottom_reached && !is_legacy(rate))
3337 		rate->index = prev_rate_idx;
3338 
3339 	*rs_table_index = index;
3340 }
3341 
3342 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3343  * column the rate table should look like this:
3344  *
3345  * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3346  * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3347  * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3348  * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3349  * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3350  * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3351  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3352  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3353  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3354  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3355  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3356  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3357  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3358  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3359  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3360  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3361  */
rs_build_rates_table(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,const struct rs_rate * initial_rate)3362 static void rs_build_rates_table(struct iwl_mvm *mvm,
3363 				 struct ieee80211_sta *sta,
3364 				 struct iwl_lq_sta *lq_sta,
3365 				 const struct rs_rate *initial_rate)
3366 {
3367 	struct rs_rate rate;
3368 	int num_rates, num_retries, index = 0;
3369 	u8 valid_tx_ant = 0;
3370 	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3371 	bool toggle_ant = false;
3372 	u32 color;
3373 
3374 	memcpy(&rate, initial_rate, sizeof(rate));
3375 
3376 	valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3377 
3378 	/* TODO: remove old API when min FW API hits 14 */
3379 	if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3380 	    rs_stbc_allow(mvm, sta, lq_sta))
3381 		rate.stbc = true;
3382 
3383 	if (is_siso(&rate)) {
3384 		num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3385 		num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3386 	} else if (is_mimo(&rate)) {
3387 		num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3388 		num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3389 	} else {
3390 		num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3391 		num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3392 		toggle_ant = true;
3393 	}
3394 
3395 	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3396 				 num_rates, num_retries, valid_tx_ant,
3397 				 toggle_ant);
3398 
3399 	rs_get_lower_rate_down_column(lq_sta, &rate);
3400 
3401 	if (is_siso(&rate)) {
3402 		num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3403 		num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3404 		lq_cmd->mimo_delim = index;
3405 	} else if (is_legacy(&rate)) {
3406 		num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3407 		num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3408 	} else {
3409 		WARN_ON_ONCE(1);
3410 	}
3411 
3412 	toggle_ant = true;
3413 
3414 	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3415 				 num_rates, num_retries, valid_tx_ant,
3416 				 toggle_ant);
3417 
3418 	rs_get_lower_rate_down_column(lq_sta, &rate);
3419 
3420 	num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3421 	num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3422 
3423 	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3424 				 num_rates, num_retries, valid_tx_ant,
3425 				 toggle_ant);
3426 
3427 	/* update the color of the LQ command (as a counter at bits 1-3) */
3428 	color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3429 	lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3430 }
3431 
3432 struct rs_bfer_active_iter_data {
3433 	struct ieee80211_sta *exclude_sta;
3434 	struct iwl_mvm_sta *bfer_mvmsta;
3435 };
3436 
rs_bfer_active_iter(void * _data,struct ieee80211_sta * sta)3437 static void rs_bfer_active_iter(void *_data,
3438 				struct ieee80211_sta *sta)
3439 {
3440 	struct rs_bfer_active_iter_data *data = _data;
3441 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3442 	struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3443 	u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3444 
3445 	if (sta == data->exclude_sta)
3446 		return;
3447 
3448 	/* The current sta has BFER allowed */
3449 	if (ss_params & LQ_SS_BFER_ALLOWED) {
3450 		WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3451 
3452 		data->bfer_mvmsta = mvmsta;
3453 	}
3454 }
3455 
rs_bfer_priority(struct iwl_mvm_sta * sta)3456 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3457 {
3458 	int prio = -1;
3459 	enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3460 
3461 	switch (viftype) {
3462 	case NL80211_IFTYPE_AP:
3463 	case NL80211_IFTYPE_P2P_GO:
3464 		prio = 3;
3465 		break;
3466 	case NL80211_IFTYPE_P2P_CLIENT:
3467 		prio = 2;
3468 		break;
3469 	case NL80211_IFTYPE_STATION:
3470 		prio = 1;
3471 		break;
3472 	default:
3473 		WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3474 		prio = -1;
3475 	}
3476 
3477 	return prio;
3478 }
3479 
3480 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
rs_bfer_priority_cmp(struct iwl_mvm_sta * sta1,struct iwl_mvm_sta * sta2)3481 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3482 				struct iwl_mvm_sta *sta2)
3483 {
3484 	int prio1 = rs_bfer_priority(sta1);
3485 	int prio2 = rs_bfer_priority(sta2);
3486 
3487 	if (prio1 > prio2)
3488 		return 1;
3489 	if (prio1 < prio2)
3490 		return -1;
3491 	return 0;
3492 }
3493 
rs_set_lq_ss_params(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,const struct rs_rate * initial_rate)3494 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3495 				struct ieee80211_sta *sta,
3496 				struct iwl_lq_sta *lq_sta,
3497 				const struct rs_rate *initial_rate)
3498 {
3499 	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3500 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3501 	struct rs_bfer_active_iter_data data = {
3502 		.exclude_sta = sta,
3503 		.bfer_mvmsta = NULL,
3504 	};
3505 	struct iwl_mvm_sta *bfer_mvmsta = NULL;
3506 	u32 ss_params = LQ_SS_PARAMS_VALID;
3507 
3508 	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3509 		goto out;
3510 
3511 #ifdef CONFIG_MAC80211_DEBUGFS
3512 	/* Check if forcing the decision is configured.
3513 	 * Note that SISO is forced by not allowing STBC or BFER
3514 	 */
3515 	if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3516 		ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3517 	else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3518 		ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3519 
3520 	if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3521 		IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3522 			       lq_sta->pers.ss_force);
3523 		goto out;
3524 	}
3525 #endif
3526 
3527 	if (lq_sta->stbc_capable)
3528 		ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3529 
3530 	if (!lq_sta->bfer_capable)
3531 		goto out;
3532 
3533 	ieee80211_iterate_stations_atomic(mvm->hw,
3534 					  rs_bfer_active_iter,
3535 					  &data);
3536 	bfer_mvmsta = data.bfer_mvmsta;
3537 
3538 	/* This code is safe as it doesn't run concurrently for different
3539 	 * stations. This is guaranteed by the fact that calls to
3540 	 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3541 	 */
3542 	if (!bfer_mvmsta) {
3543 		IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3544 
3545 		ss_params |= LQ_SS_BFER_ALLOWED;
3546 		goto out;
3547 	}
3548 
3549 	IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3550 		       bfer_mvmsta->sta_id);
3551 
3552 	/* Disallow BFER on another STA if active and we're a higher priority */
3553 	if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3554 		struct iwl_lq_cmd *bfersta_lq_cmd =
3555 			&bfer_mvmsta->lq_sta.rs_drv.lq;
3556 		u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3557 
3558 		bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3559 		bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3560 		iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3561 
3562 		ss_params |= LQ_SS_BFER_ALLOWED;
3563 		IWL_DEBUG_RATE(mvm,
3564 			       "Lower priority BFER sta found (%d). Switch BFER\n",
3565 			       bfer_mvmsta->sta_id);
3566 	}
3567 out:
3568 	lq_cmd->ss_params = cpu_to_le32(ss_params);
3569 }
3570 
rs_fill_lq_cmd(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,const struct rs_rate * initial_rate)3571 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3572 			   struct ieee80211_sta *sta,
3573 			   struct iwl_lq_sta *lq_sta,
3574 			   const struct rs_rate *initial_rate)
3575 {
3576 	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3577 	struct iwl_mvm_sta *mvmsta;
3578 	struct iwl_mvm_vif *mvmvif;
3579 
3580 	lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3581 	lq_cmd->agg_time_limit =
3582 		cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3583 
3584 #ifdef CONFIG_MAC80211_DEBUGFS
3585 	if (lq_sta->pers.dbg_fixed_rate) {
3586 		rs_build_rates_table_from_fixed(mvm, lq_cmd,
3587 						lq_sta->band,
3588 						lq_sta->pers.dbg_fixed_rate);
3589 		return;
3590 	}
3591 #endif
3592 	if (WARN_ON_ONCE(!sta || !initial_rate))
3593 		return;
3594 
3595 	rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3596 
3597 	if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3598 		rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3599 
3600 	mvmsta = iwl_mvm_sta_from_mac80211(sta);
3601 	mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3602 
3603 	if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3604 	    num_of_ant(initial_rate->ant) == 1)
3605 		lq_cmd->single_stream_ant_msk = initial_rate->ant;
3606 
3607 	lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3608 
3609 	/*
3610 	 * In case of low latency, tell the firmware to leave a frame in the
3611 	 * Tx Fifo so that it can start a transaction in the same TxOP. This
3612 	 * basically allows the firmware to send bursts.
3613 	 */
3614 	if (iwl_mvm_vif_low_latency(mvmvif))
3615 		lq_cmd->agg_frame_cnt_limit--;
3616 
3617 	if (mvmsta->vif->p2p)
3618 		lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3619 
3620 	lq_cmd->agg_time_limit =
3621 			cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3622 }
3623 
rs_alloc(struct ieee80211_hw * hw)3624 static void *rs_alloc(struct ieee80211_hw *hw)
3625 {
3626 	return hw->priv;
3627 }
3628 
3629 /* rate scale requires free function to be implemented */
rs_free(void * mvm_rate)3630 static void rs_free(void *mvm_rate)
3631 {
3632 	return;
3633 }
3634 
rs_free_sta(void * mvm_r,struct ieee80211_sta * sta,void * mvm_sta)3635 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3636 {
3637 	struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3638 	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3639 
3640 	IWL_DEBUG_RATE(mvm, "enter\n");
3641 	IWL_DEBUG_RATE(mvm, "leave\n");
3642 }
3643 
rs_pretty_print_rate_v1(char * buf,int bufsz,const u32 rate)3644 int rs_pretty_print_rate_v1(char *buf, int bufsz, const u32 rate)
3645 {
3646 
3647 	char *type;
3648 	u8 mcs = 0, nss = 0;
3649 	u8 ant = (rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3650 	u32 bw = (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) >>
3651 		RATE_MCS_CHAN_WIDTH_POS;
3652 
3653 	if (!(rate & RATE_MCS_HT_MSK_V1) &&
3654 	    !(rate & RATE_MCS_VHT_MSK_V1) &&
3655 	    !(rate & RATE_MCS_HE_MSK_V1)) {
3656 		int index = iwl_hwrate_to_plcp_idx(rate);
3657 
3658 		return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3659 				 iwl_rs_pretty_ant(ant),
3660 				 index == IWL_RATE_INVALID ? "BAD" :
3661 				 iwl_rate_mcs(index)->mbps);
3662 	}
3663 
3664 	if (rate & RATE_MCS_VHT_MSK_V1) {
3665 		type = "VHT";
3666 		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3667 		nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3668 		       >> RATE_VHT_MCS_NSS_POS) + 1;
3669 	} else if (rate & RATE_MCS_HT_MSK_V1) {
3670 		type = "HT";
3671 		mcs = rate & RATE_HT_MCS_INDEX_MSK_V1;
3672 		nss = ((rate & RATE_HT_MCS_NSS_MSK_V1)
3673 		       >> RATE_HT_MCS_NSS_POS_V1) + 1;
3674 	} else if (rate & RATE_MCS_HE_MSK_V1) {
3675 		type = "HE";
3676 		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3677 		nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3678 		       >> RATE_VHT_MCS_NSS_POS) + 1;
3679 	} else {
3680 		type = "Unknown"; /* shouldn't happen */
3681 	}
3682 
3683 	return scnprintf(buf, bufsz,
3684 			 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s",
3685 			 rate, type, iwl_rs_pretty_ant(ant), iwl_rs_pretty_bw(bw), mcs, nss,
3686 			 (rate & RATE_MCS_SGI_MSK_V1) ? "SGI " : "NGI ",
3687 			 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3688 			 (rate & RATE_MCS_LDPC_MSK_V1) ? "LDPC " : "",
3689 			 (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "",
3690 			 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3691 }
3692 
3693 #ifdef CONFIG_MAC80211_DEBUGFS
3694 /*
3695  * Program the device to use fixed rate for frame transmit
3696  * This is for debugging/testing only
3697  * once the device start use fixed rate, we need to reload the module
3698  * to being back the normal operation.
3699  */
rs_program_fix_rate(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta)3700 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3701 				struct iwl_lq_sta *lq_sta)
3702 {
3703 	lq_sta->active_legacy_rate = 0x0FFF;	/* 1 - 54 MBits, includes CCK */
3704 	lq_sta->active_siso_rate   = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
3705 	lq_sta->active_mimo2_rate  = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
3706 
3707 	IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3708 		       lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3709 
3710 	if (lq_sta->pers.dbg_fixed_rate) {
3711 		rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3712 		iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3713 	}
3714 }
3715 
rs_sta_dbgfs_scale_table_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)3716 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3717 			const char __user *user_buf, size_t count, loff_t *ppos)
3718 {
3719 	struct iwl_lq_sta *lq_sta = file->private_data;
3720 	struct iwl_mvm *mvm;
3721 	char buf[64];
3722 	size_t buf_size;
3723 	u32 parsed_rate;
3724 
3725 	mvm = lq_sta->pers.drv;
3726 	memset(buf, 0, sizeof(buf));
3727 	buf_size = min(count, sizeof(buf) -  1);
3728 	if (copy_from_user(buf, user_buf, buf_size))
3729 		return -EFAULT;
3730 
3731 	if (sscanf(buf, "%x", &parsed_rate) == 1)
3732 		lq_sta->pers.dbg_fixed_rate = parsed_rate;
3733 	else
3734 		lq_sta->pers.dbg_fixed_rate = 0;
3735 
3736 	rs_program_fix_rate(mvm, lq_sta);
3737 
3738 	return count;
3739 }
3740 
rs_sta_dbgfs_scale_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3741 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3742 			char __user *user_buf, size_t count, loff_t *ppos)
3743 {
3744 	char *buff;
3745 	int desc = 0;
3746 	int i = 0;
3747 	ssize_t ret;
3748 	static const size_t bufsz = 2048;
3749 
3750 	struct iwl_lq_sta *lq_sta = file->private_data;
3751 	struct iwl_mvm_sta *mvmsta =
3752 		container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3753 	struct iwl_mvm *mvm;
3754 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3755 	struct rs_rate *rate = &tbl->rate;
3756 	u32 ss_params;
3757 
3758 	mvm = lq_sta->pers.drv;
3759 	buff = kmalloc(bufsz, GFP_KERNEL);
3760 	if (!buff)
3761 		return -ENOMEM;
3762 
3763 	desc += scnprintf(buff + desc, bufsz - desc,
3764 			  "sta_id %d\n", lq_sta->lq.sta_id);
3765 	desc += scnprintf(buff + desc, bufsz - desc,
3766 			  "failed=%d success=%d rate=0%lX\n",
3767 			  lq_sta->total_failed, lq_sta->total_success,
3768 			  lq_sta->active_legacy_rate);
3769 	desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3770 			  lq_sta->pers.dbg_fixed_rate);
3771 	desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s\n",
3772 	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3773 	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "");
3774 	desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3775 			  (is_legacy(rate)) ? "legacy" :
3776 			  is_vht(rate) ? "VHT" : "HT");
3777 	if (!is_legacy(rate)) {
3778 		desc += scnprintf(buff + desc, bufsz - desc, " %s",
3779 		   (is_siso(rate)) ? "SISO" : "MIMO2");
3780 		desc += scnprintf(buff + desc, bufsz - desc, " %s",
3781 				(is_ht20(rate)) ? "20MHz" :
3782 				(is_ht40(rate)) ? "40MHz" :
3783 				(is_ht80(rate)) ? "80MHz" :
3784 				(is_ht160(rate)) ? "160MHz" : "BAD BW");
3785 		desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3786 				(rate->sgi) ? "SGI" : "NGI",
3787 				(rate->ldpc) ? "LDPC" : "BCC",
3788 				(lq_sta->is_agg) ? "AGG on" : "",
3789 				(mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3790 	}
3791 	desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3792 			lq_sta->last_rate_n_flags);
3793 	desc += scnprintf(buff + desc, bufsz - desc,
3794 			"general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3795 			lq_sta->lq.flags,
3796 			lq_sta->lq.mimo_delim,
3797 			lq_sta->lq.single_stream_ant_msk,
3798 			lq_sta->lq.dual_stream_ant_msk);
3799 
3800 	desc += scnprintf(buff + desc, bufsz - desc,
3801 			"agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3802 			le16_to_cpu(lq_sta->lq.agg_time_limit),
3803 			lq_sta->lq.agg_disable_start_th,
3804 			lq_sta->lq.agg_frame_cnt_limit);
3805 
3806 	desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3807 			  lq_sta->lq.reduced_tpc);
3808 	ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3809 	desc += scnprintf(buff + desc, bufsz - desc,
3810 			"single stream params: %s%s%s%s\n",
3811 			(ss_params & LQ_SS_PARAMS_VALID) ?
3812 			"VALID" : "INVALID",
3813 			(ss_params & LQ_SS_BFER_ALLOWED) ?
3814 			", BFER" : "",
3815 			(ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3816 			", STBC" : "",
3817 			(ss_params & LQ_SS_FORCE) ?
3818 			", FORCE" : "");
3819 	desc += scnprintf(buff + desc, bufsz - desc,
3820 			"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3821 			lq_sta->lq.initial_rate_index[0],
3822 			lq_sta->lq.initial_rate_index[1],
3823 			lq_sta->lq.initial_rate_index[2],
3824 			lq_sta->lq.initial_rate_index[3]);
3825 
3826 	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3827 		u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3828 
3829 		desc += scnprintf(buff + desc, bufsz - desc,
3830 				  " rate[%d] 0x%X ", i, r);
3831 		desc += rs_pretty_print_rate_v1(buff + desc, bufsz - desc, r);
3832 		if (desc < bufsz - 1)
3833 			buff[desc++] = '\n';
3834 	}
3835 
3836 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3837 	kfree(buff);
3838 	return ret;
3839 }
3840 
3841 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3842 	.write = rs_sta_dbgfs_scale_table_write,
3843 	.read = rs_sta_dbgfs_scale_table_read,
3844 	.open = simple_open,
3845 	.llseek = default_llseek,
3846 };
rs_sta_dbgfs_stats_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3847 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3848 			char __user *user_buf, size_t count, loff_t *ppos)
3849 {
3850 	char *buff;
3851 	int desc = 0;
3852 	int i, j;
3853 	ssize_t ret;
3854 	struct iwl_scale_tbl_info *tbl;
3855 	struct rs_rate *rate;
3856 	struct iwl_lq_sta *lq_sta = file->private_data;
3857 
3858 	buff = kmalloc(1024, GFP_KERNEL);
3859 	if (!buff)
3860 		return -ENOMEM;
3861 
3862 	for (i = 0; i < LQ_SIZE; i++) {
3863 		tbl = &(lq_sta->lq_info[i]);
3864 		rate = &tbl->rate;
3865 		desc += sprintf(buff+desc,
3866 				"%s type=%d SGI=%d BW=%s DUP=0\n"
3867 				"index=%d\n",
3868 				lq_sta->active_tbl == i ? "*" : "x",
3869 				rate->type,
3870 				rate->sgi,
3871 				is_ht20(rate) ? "20MHz" :
3872 				is_ht40(rate) ? "40MHz" :
3873 				is_ht80(rate) ? "80MHz" :
3874 				is_ht160(rate) ? "160MHz" : "ERR",
3875 				rate->index);
3876 		for (j = 0; j < IWL_RATE_COUNT; j++) {
3877 			desc += sprintf(buff+desc,
3878 				"counter=%d success=%d %%=%d\n",
3879 				tbl->win[j].counter,
3880 				tbl->win[j].success_counter,
3881 				tbl->win[j].success_ratio);
3882 		}
3883 	}
3884 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3885 	kfree(buff);
3886 	return ret;
3887 }
3888 
3889 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3890 	.read = rs_sta_dbgfs_stats_table_read,
3891 	.open = simple_open,
3892 	.llseek = default_llseek,
3893 };
3894 
rs_sta_dbgfs_drv_tx_stats_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3895 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3896 					      char __user *user_buf,
3897 					      size_t count, loff_t *ppos)
3898 {
3899 	static const char * const column_name[] = {
3900 		[RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3901 		[RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3902 		[RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3903 		[RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3904 		[RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3905 		[RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3906 		[RS_COLUMN_MIMO2] = "MIMO2",
3907 		[RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3908 	};
3909 
3910 	static const char * const rate_name[] = {
3911 		[IWL_RATE_1M_INDEX] = "1M",
3912 		[IWL_RATE_2M_INDEX] = "2M",
3913 		[IWL_RATE_5M_INDEX] = "5.5M",
3914 		[IWL_RATE_11M_INDEX] = "11M",
3915 		[IWL_RATE_6M_INDEX] = "6M|MCS0",
3916 		[IWL_RATE_9M_INDEX] = "9M",
3917 		[IWL_RATE_12M_INDEX] = "12M|MCS1",
3918 		[IWL_RATE_18M_INDEX] = "18M|MCS2",
3919 		[IWL_RATE_24M_INDEX] = "24M|MCS3",
3920 		[IWL_RATE_36M_INDEX] = "36M|MCS4",
3921 		[IWL_RATE_48M_INDEX] = "48M|MCS5",
3922 		[IWL_RATE_54M_INDEX] = "54M|MCS6",
3923 		[IWL_RATE_MCS_7_INDEX] = "MCS7",
3924 		[IWL_RATE_MCS_8_INDEX] = "MCS8",
3925 		[IWL_RATE_MCS_9_INDEX] = "MCS9",
3926 		[IWL_RATE_MCS_10_INDEX] = "MCS10",
3927 		[IWL_RATE_MCS_11_INDEX] = "MCS11",
3928 	};
3929 
3930 	char *buff, *pos, *endpos;
3931 	int col, rate;
3932 	ssize_t ret;
3933 	struct iwl_lq_sta *lq_sta = file->private_data;
3934 	struct rs_rate_stats *stats;
3935 	static const size_t bufsz = 1024;
3936 
3937 	buff = kmalloc(bufsz, GFP_KERNEL);
3938 	if (!buff)
3939 		return -ENOMEM;
3940 
3941 	pos = buff;
3942 	endpos = pos + bufsz;
3943 
3944 	pos += scnprintf(pos, endpos - pos, "COLUMN,");
3945 	for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3946 		pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3947 	pos += scnprintf(pos, endpos - pos, "\n");
3948 
3949 	for (col = 0; col < RS_COLUMN_COUNT; col++) {
3950 		pos += scnprintf(pos, endpos - pos,
3951 				 "%s,", column_name[col]);
3952 
3953 		for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3954 			stats = &(lq_sta->pers.tx_stats[col][rate]);
3955 			pos += scnprintf(pos, endpos - pos,
3956 					 "%llu/%llu,",
3957 					 stats->success,
3958 					 stats->total);
3959 		}
3960 		pos += scnprintf(pos, endpos - pos, "\n");
3961 	}
3962 
3963 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3964 	kfree(buff);
3965 	return ret;
3966 }
3967 
rs_sta_dbgfs_drv_tx_stats_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)3968 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3969 					       const char __user *user_buf,
3970 					       size_t count, loff_t *ppos)
3971 {
3972 	struct iwl_lq_sta *lq_sta = file->private_data;
3973 	memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3974 
3975 	return count;
3976 }
3977 
3978 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3979 	.read = rs_sta_dbgfs_drv_tx_stats_read,
3980 	.write = rs_sta_dbgfs_drv_tx_stats_write,
3981 	.open = simple_open,
3982 	.llseek = default_llseek,
3983 };
3984 
iwl_dbgfs_ss_force_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3985 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3986 				       char __user *user_buf,
3987 				       size_t count, loff_t *ppos)
3988 {
3989 	struct iwl_lq_sta *lq_sta = file->private_data;
3990 	char buf[12];
3991 	int bufsz = sizeof(buf);
3992 	int pos = 0;
3993 	static const char * const ss_force_name[] = {
3994 		[RS_SS_FORCE_NONE] = "none",
3995 		[RS_SS_FORCE_STBC] = "stbc",
3996 		[RS_SS_FORCE_BFER] = "bfer",
3997 		[RS_SS_FORCE_SISO] = "siso",
3998 	};
3999 
4000 	pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4001 			 ss_force_name[lq_sta->pers.ss_force]);
4002 	return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4003 }
4004 
iwl_dbgfs_ss_force_write(struct iwl_lq_sta * lq_sta,char * buf,size_t count,loff_t * ppos)4005 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4006 					size_t count, loff_t *ppos)
4007 {
4008 	struct iwl_mvm *mvm = lq_sta->pers.drv;
4009 	int ret = 0;
4010 
4011 	if (!strncmp("none", buf, 4)) {
4012 		lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4013 	} else if (!strncmp("siso", buf, 4)) {
4014 		lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4015 	} else if (!strncmp("stbc", buf, 4)) {
4016 		if (lq_sta->stbc_capable) {
4017 			lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4018 		} else {
4019 			IWL_ERR(mvm,
4020 				"can't force STBC. peer doesn't support\n");
4021 			ret = -EINVAL;
4022 		}
4023 	} else if (!strncmp("bfer", buf, 4)) {
4024 		if (lq_sta->bfer_capable) {
4025 			lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4026 		} else {
4027 			IWL_ERR(mvm,
4028 				"can't force BFER. peer doesn't support\n");
4029 			ret = -EINVAL;
4030 		}
4031 	} else {
4032 		IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4033 		ret = -EINVAL;
4034 	}
4035 	return ret ?: count;
4036 }
4037 
4038 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4039 	_MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4040 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {		\
4041 		debugfs_create_file(#name, mode, parent, lq_sta,	\
4042 				    &iwl_dbgfs_##name##_ops);		\
4043 	} while (0)
4044 
4045 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4046 
rs_drv_add_sta_debugfs(void * mvm,void * priv_sta,struct dentry * dir)4047 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4048 				   struct dentry *dir)
4049 {
4050 	struct iwl_lq_sta *lq_sta = priv_sta;
4051 	struct iwl_mvm_sta *mvmsta;
4052 
4053 	mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4054 
4055 	if (!mvmsta->vif)
4056 		return;
4057 
4058 	debugfs_create_file("rate_scale_table", 0600, dir,
4059 			    lq_sta, &rs_sta_dbgfs_scale_table_ops);
4060 	debugfs_create_file("rate_stats_table", 0400, dir,
4061 			    lq_sta, &rs_sta_dbgfs_stats_table_ops);
4062 	debugfs_create_file("drv_tx_stats", 0600, dir,
4063 			    lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4064 	debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4065 			  &lq_sta->tx_agg_tid_en);
4066 	debugfs_create_u8("reduced_tpc", 0600, dir,
4067 			  &lq_sta->pers.dbg_fixed_txp_reduction);
4068 
4069 	MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4070 }
4071 #endif
4072 
4073 /*
4074  * Initialization of rate scaling information is done by driver after
4075  * the station is added. Since mac80211 calls this function before a
4076  * station is added we ignore it.
4077  */
rs_rate_init_ops(void * mvm_r,struct ieee80211_supported_band * sband,struct cfg80211_chan_def * chandef,struct ieee80211_sta * sta,void * mvm_sta)4078 static void rs_rate_init_ops(void *mvm_r,
4079 			     struct ieee80211_supported_band *sband,
4080 			     struct cfg80211_chan_def *chandef,
4081 			     struct ieee80211_sta *sta, void *mvm_sta)
4082 {
4083 }
4084 
4085 /* ops for rate scaling implemented in the driver */
4086 static const struct rate_control_ops rs_mvm_ops_drv = {
4087 	.name = RS_NAME,
4088 	.tx_status = rs_drv_mac80211_tx_status,
4089 	.get_rate = rs_drv_get_rate,
4090 	.rate_init = rs_rate_init_ops,
4091 	.alloc = rs_alloc,
4092 	.free = rs_free,
4093 	.alloc_sta = rs_drv_alloc_sta,
4094 	.free_sta = rs_free_sta,
4095 	.rate_update = rs_drv_rate_update,
4096 #ifdef CONFIG_MAC80211_DEBUGFS
4097 	.add_sta_debugfs = rs_drv_add_sta_debugfs,
4098 #endif
4099 	.capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4100 };
4101 
iwl_mvm_rs_rate_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,enum nl80211_band band,bool update)4102 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4103 			  enum nl80211_band band, bool update)
4104 {
4105 	if (iwl_mvm_has_tlc_offload(mvm)) {
4106 		rs_fw_rate_init(mvm, sta, band, update);
4107 	} else {
4108 		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4109 
4110 		spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock);
4111 		rs_drv_rate_init(mvm, sta, band);
4112 		spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
4113 	}
4114 }
4115 
iwl_mvm_rate_control_register(void)4116 int iwl_mvm_rate_control_register(void)
4117 {
4118 	return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4119 }
4120 
iwl_mvm_rate_control_unregister(void)4121 void iwl_mvm_rate_control_unregister(void)
4122 {
4123 	ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4124 }
4125 
rs_drv_tx_protection(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,bool enable)4126 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4127 				bool enable)
4128 {
4129 	struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4130 
4131 	lockdep_assert_held(&mvm->mutex);
4132 
4133 	if (enable) {
4134 		if (mvmsta->tx_protection == 0)
4135 			lq->flags |= LQ_FLAG_USE_RTS_MSK;
4136 		mvmsta->tx_protection++;
4137 	} else {
4138 		mvmsta->tx_protection--;
4139 		if (mvmsta->tx_protection == 0)
4140 			lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4141 	}
4142 
4143 	return iwl_mvm_send_lq_cmd(mvm, lq);
4144 }
4145 
4146 /**
4147  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4148  * @mvm: The mvm component
4149  * @mvmsta: The station
4150  * @enable: Enable Tx protection?
4151  */
iwl_mvm_tx_protection(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,bool enable)4152 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4153 			  bool enable)
4154 {
4155 	if (iwl_mvm_has_tlc_offload(mvm))
4156 		return rs_fw_tx_protection(mvm, mvmsta, enable);
4157 	else
4158 		return rs_drv_tx_protection(mvm, mvmsta, enable);
4159 }
4160