1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3  *
4  * Copyright(c) 2005 - 2014, 2018 - 2023 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 
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 
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->deflink.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 
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 
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 
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 
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 
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 
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 = NULL;
516 
517 	sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
518 		iwl_rs_pretty_ant(rate->ant), rate_str ?: "BAD_RATE");
519 	return buf;
520 }
521 
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 
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 
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 
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 
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 
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 
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  */
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  */
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 
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 
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 
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->deflink.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 */
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 */
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 = FIELD_GET(RATE_MCS_NSS_MSK, ucode_rate) + 1;
899 
900 		if (nss == 1) {
901 			rate->type = LQ_VHT_SISO;
902 			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
903 				  "stbc %d bfer %d",
904 				  rate->stbc, rate->bfer);
905 		} else if (nss == 2) {
906 			rate->type = LQ_VHT_MIMO2;
907 			WARN_ON_ONCE(num_of_ant != 2);
908 		} else {
909 			WARN_ON_ONCE(1);
910 		}
911 	} else if (ucode_rate & RATE_MCS_HE_MSK_V1) {
912 		nss = FIELD_GET(RATE_MCS_NSS_MSK, ucode_rate) + 1;
913 
914 		if (nss == 1) {
915 			rate->type = LQ_HE_SISO;
916 			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
917 				  "stbc %d bfer %d", rate->stbc, rate->bfer);
918 		} else if (nss == 2) {
919 			rate->type = LQ_HE_MIMO2;
920 			WARN_ON_ONCE(num_of_ant != 2);
921 		} else {
922 			WARN_ON_ONCE(1);
923 		}
924 	}
925 
926 	WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
927 		     !is_he(rate) && !is_vht(rate));
928 
929 	return 0;
930 }
931 
932 /* switch to another antenna/antennas and return 1 */
933 /* if no other valid antenna found, return 0 */
934 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
935 {
936 	u8 new_ant_type;
937 
938 	if (!rs_is_valid_ant(valid_ant, rate->ant))
939 		return 0;
940 
941 	new_ant_type = ant_toggle_lookup[rate->ant];
942 
943 	while ((new_ant_type != rate->ant) &&
944 	       !rs_is_valid_ant(valid_ant, new_ant_type))
945 		new_ant_type = ant_toggle_lookup[new_ant_type];
946 
947 	if (new_ant_type == rate->ant)
948 		return 0;
949 
950 	rate->ant = new_ant_type;
951 
952 	return 1;
953 }
954 
955 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
956 				  struct rs_rate *rate)
957 {
958 	if (is_legacy(rate))
959 		return lq_sta->active_legacy_rate;
960 	else if (is_siso(rate))
961 		return lq_sta->active_siso_rate;
962 	else if (is_mimo2(rate))
963 		return lq_sta->active_mimo2_rate;
964 
965 	WARN_ON_ONCE(1);
966 	return 0;
967 }
968 
969 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
970 				int rate_type)
971 {
972 	u8 high = IWL_RATE_INVALID;
973 	u8 low = IWL_RATE_INVALID;
974 
975 	/* 802.11A or ht walks to the next literal adjacent rate in
976 	 * the rate table */
977 	if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
978 		int i;
979 		u32 mask;
980 
981 		/* Find the previous rate that is in the rate mask */
982 		i = index - 1;
983 		if (i >= 0)
984 			mask = BIT(i);
985 		for (; i >= 0; i--, mask >>= 1) {
986 			if (rate_mask & mask) {
987 				low = i;
988 				break;
989 			}
990 		}
991 
992 		/* Find the next rate that is in the rate mask */
993 		i = index + 1;
994 		for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
995 			if (rate_mask & mask) {
996 				high = i;
997 				break;
998 			}
999 		}
1000 
1001 		return (high << 8) | low;
1002 	}
1003 
1004 	low = index;
1005 	while (low != IWL_RATE_INVALID) {
1006 		low = iwl_rates[low].prev_rs;
1007 		if (low == IWL_RATE_INVALID)
1008 			break;
1009 		if (rate_mask & (1 << low))
1010 			break;
1011 	}
1012 
1013 	high = index;
1014 	while (high != IWL_RATE_INVALID) {
1015 		high = iwl_rates[high].next_rs;
1016 		if (high == IWL_RATE_INVALID)
1017 			break;
1018 		if (rate_mask & (1 << high))
1019 			break;
1020 	}
1021 
1022 	return (high << 8) | low;
1023 }
1024 
1025 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1026 				     struct rs_rate *rate)
1027 {
1028 	return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1029 }
1030 
1031 /* Get the next supported lower rate in the current column.
1032  * Return true if bottom rate in the current column was reached
1033  */
1034 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1035 					struct rs_rate *rate)
1036 {
1037 	u8 low;
1038 	u16 high_low;
1039 	u16 rate_mask;
1040 	struct iwl_mvm *mvm = lq_sta->pers.drv;
1041 
1042 	rate_mask = rs_get_supported_rates(lq_sta, rate);
1043 	high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1044 					rate->type);
1045 	low = high_low & 0xff;
1046 
1047 	/* Bottom rate of column reached */
1048 	if (low == IWL_RATE_INVALID)
1049 		return true;
1050 
1051 	rate->index = low;
1052 	return false;
1053 }
1054 
1055 /* Get the next rate to use following a column downgrade */
1056 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1057 					  struct rs_rate *rate)
1058 {
1059 	struct iwl_mvm *mvm = lq_sta->pers.drv;
1060 
1061 	if (is_legacy(rate)) {
1062 		/* No column to downgrade from Legacy */
1063 		return;
1064 	} else if (is_siso(rate)) {
1065 		/* Downgrade to Legacy if we were in SISO */
1066 		if (lq_sta->band == NL80211_BAND_5GHZ)
1067 			rate->type = LQ_LEGACY_A;
1068 		else
1069 			rate->type = LQ_LEGACY_G;
1070 
1071 		rate->bw = RATE_MCS_CHAN_WIDTH_20;
1072 
1073 		if (WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX))
1074 			rate->index = rs_ht_to_legacy[IWL_RATE_MCS_0_INDEX];
1075 		else if (WARN_ON_ONCE(rate->index > IWL_RATE_MCS_9_INDEX))
1076 			rate->index = rs_ht_to_legacy[IWL_RATE_MCS_9_INDEX];
1077 		else
1078 			rate->index = rs_ht_to_legacy[rate->index];
1079 
1080 		rate->ldpc = false;
1081 	} else {
1082 		/* Downgrade to SISO with same MCS if in MIMO  */
1083 		rate->type = is_vht_mimo2(rate) ?
1084 			LQ_VHT_SISO : LQ_HT_SISO;
1085 	}
1086 
1087 	if (num_of_ant(rate->ant) > 1)
1088 		rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1089 
1090 	/* Relevant in both switching to SISO or Legacy */
1091 	rate->sgi = false;
1092 
1093 	if (!rs_rate_supported(lq_sta, rate))
1094 		rs_get_lower_rate_in_column(lq_sta, rate);
1095 }
1096 
1097 /* Check if both rates share the same column */
1098 static inline bool rs_rate_column_match(struct rs_rate *a,
1099 					struct rs_rate *b)
1100 {
1101 	bool ant_match;
1102 
1103 	if (a->stbc || a->bfer)
1104 		ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1105 	else
1106 		ant_match = (a->ant == b->ant);
1107 
1108 	return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1109 		&& ant_match;
1110 }
1111 
1112 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1113 {
1114 	if (is_legacy(rate)) {
1115 		if (rate->ant == ANT_A)
1116 			return RS_COLUMN_LEGACY_ANT_A;
1117 
1118 		if (rate->ant == ANT_B)
1119 			return RS_COLUMN_LEGACY_ANT_B;
1120 
1121 		goto err;
1122 	}
1123 
1124 	if (is_siso(rate)) {
1125 		if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1126 			return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1127 				RS_COLUMN_SISO_ANT_A;
1128 
1129 		if (rate->ant == ANT_B)
1130 			return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1131 				RS_COLUMN_SISO_ANT_B;
1132 
1133 		goto err;
1134 	}
1135 
1136 	if (is_mimo(rate))
1137 		return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1138 
1139 err:
1140 	return RS_COLUMN_INVALID;
1141 }
1142 
1143 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1144 {
1145 	u8 tid = IWL_MAX_TID_COUNT;
1146 
1147 	if (ieee80211_is_data_qos(hdr->frame_control)) {
1148 		u8 *qc = ieee80211_get_qos_ctl(hdr);
1149 		tid = qc[0] & 0xf;
1150 	}
1151 
1152 	if (unlikely(tid > IWL_MAX_TID_COUNT))
1153 		tid = IWL_MAX_TID_COUNT;
1154 
1155 	return tid;
1156 }
1157 
1158 /*
1159  * mac80211 sends us Tx status
1160  */
1161 static void rs_drv_mac80211_tx_status(void *mvm_r,
1162 				      struct ieee80211_supported_band *sband,
1163 				      struct ieee80211_sta *sta, void *priv_sta,
1164 				      struct sk_buff *skb)
1165 {
1166 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1167 	struct iwl_op_mode *op_mode = mvm_r;
1168 	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1169 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1170 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1171 
1172 	if (!mvmsta->vif)
1173 		return;
1174 
1175 	if (!ieee80211_is_data(hdr->frame_control) ||
1176 	    info->flags & IEEE80211_TX_CTL_NO_ACK)
1177 		return;
1178 
1179 	iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1180 			     ieee80211_is_qos_nullfunc(hdr->frame_control));
1181 }
1182 
1183 /*
1184  * Begin a period of staying with a selected modulation mode.
1185  * Set "stay_in_tbl" flag to prevent any mode switches.
1186  * Set frame tx success limits according to legacy vs. high-throughput,
1187  * and reset overall (spanning all rates) tx success history statistics.
1188  * These control how long we stay using same modulation mode before
1189  * searching for a new mode.
1190  */
1191 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1192 				 struct iwl_lq_sta *lq_sta)
1193 {
1194 	IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1195 	lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1196 	if (is_legacy) {
1197 		lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1198 		lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1199 		lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1200 	} else {
1201 		lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1202 		lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1203 		lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1204 	}
1205 	lq_sta->table_count = 0;
1206 	lq_sta->total_failed = 0;
1207 	lq_sta->total_success = 0;
1208 	lq_sta->flush_timer = jiffies;
1209 	lq_sta->visited_columns = 0;
1210 }
1211 
1212 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1213 {
1214 	if (rate_mask)
1215 		return find_last_bit(&rate_mask, BITS_PER_LONG);
1216 	return IWL_RATE_INVALID;
1217 }
1218 
1219 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1220 				   const struct rs_tx_column *column)
1221 {
1222 	switch (column->mode) {
1223 	case RS_LEGACY:
1224 		return lq_sta->max_legacy_rate_idx;
1225 	case RS_SISO:
1226 		return lq_sta->max_siso_rate_idx;
1227 	case RS_MIMO2:
1228 		return lq_sta->max_mimo2_rate_idx;
1229 	default:
1230 		WARN_ON_ONCE(1);
1231 	}
1232 
1233 	return lq_sta->max_legacy_rate_idx;
1234 }
1235 
1236 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1237 					    const struct rs_tx_column *column,
1238 					    u32 bw)
1239 {
1240 	/* Used to choose among HT tables */
1241 	const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1242 
1243 	if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1244 			 column->mode != RS_SISO &&
1245 			 column->mode != RS_MIMO2))
1246 		return expected_tpt_legacy;
1247 
1248 	/* Legacy rates have only one table */
1249 	if (column->mode == RS_LEGACY)
1250 		return expected_tpt_legacy;
1251 
1252 	ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1253 	/* Choose among many HT tables depending on number of streams
1254 	 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1255 	 * status */
1256 	if (column->mode == RS_SISO) {
1257 		switch (bw) {
1258 		case RATE_MCS_CHAN_WIDTH_20:
1259 			ht_tbl_pointer = expected_tpt_siso_20MHz;
1260 			break;
1261 		case RATE_MCS_CHAN_WIDTH_40:
1262 			ht_tbl_pointer = expected_tpt_siso_40MHz;
1263 			break;
1264 		case RATE_MCS_CHAN_WIDTH_80:
1265 			ht_tbl_pointer = expected_tpt_siso_80MHz;
1266 			break;
1267 		case RATE_MCS_CHAN_WIDTH_160:
1268 			ht_tbl_pointer = expected_tpt_siso_160MHz;
1269 			break;
1270 		default:
1271 			WARN_ON_ONCE(1);
1272 		}
1273 	} else if (column->mode == RS_MIMO2) {
1274 		switch (bw) {
1275 		case RATE_MCS_CHAN_WIDTH_20:
1276 			ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1277 			break;
1278 		case RATE_MCS_CHAN_WIDTH_40:
1279 			ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1280 			break;
1281 		case RATE_MCS_CHAN_WIDTH_80:
1282 			ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1283 			break;
1284 		case RATE_MCS_CHAN_WIDTH_160:
1285 			ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1286 			break;
1287 		default:
1288 			WARN_ON_ONCE(1);
1289 		}
1290 	} else {
1291 		WARN_ON_ONCE(1);
1292 	}
1293 
1294 	if (!column->sgi && !lq_sta->is_agg)		/* Normal */
1295 		return ht_tbl_pointer[0];
1296 	else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1297 		return ht_tbl_pointer[1];
1298 	else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1299 		return ht_tbl_pointer[2];
1300 	else						/* AGG+SGI */
1301 		return ht_tbl_pointer[3];
1302 }
1303 
1304 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1305 				      struct iwl_scale_tbl_info *tbl)
1306 {
1307 	struct rs_rate *rate = &tbl->rate;
1308 	const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1309 
1310 	tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1311 }
1312 
1313 /* rs uses two tables, one is active and the second is for searching better
1314  * configuration. This function, according to the index of the currently
1315  * active table returns the search table, which is located at the
1316  * index complementary to 1 according to the active table (active = 1,
1317  * search = 0 or active = 0, search = 1).
1318  * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1319  */
1320 static inline u8 rs_search_tbl(u8 active_tbl)
1321 {
1322 	return (active_tbl ^ 1) & 1;
1323 }
1324 
1325 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1326 			    struct iwl_lq_sta *lq_sta,
1327 			    struct iwl_scale_tbl_info *tbl,	/* "search" */
1328 			    unsigned long rate_mask, s8 index)
1329 {
1330 	struct iwl_scale_tbl_info *active_tbl =
1331 	    &(lq_sta->lq_info[lq_sta->active_tbl]);
1332 	s32 success_ratio = active_tbl->win[index].success_ratio;
1333 	u16 expected_current_tpt = active_tbl->expected_tpt[index];
1334 	const u16 *tpt_tbl = tbl->expected_tpt;
1335 	u16 high_low;
1336 	u32 target_tpt;
1337 	int rate_idx;
1338 
1339 	if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1340 		target_tpt = 100 * expected_current_tpt;
1341 		IWL_DEBUG_RATE(mvm,
1342 			       "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1343 			       success_ratio, target_tpt);
1344 	} else {
1345 		target_tpt = lq_sta->last_tpt;
1346 		IWL_DEBUG_RATE(mvm,
1347 			       "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1348 			       success_ratio, target_tpt);
1349 	}
1350 
1351 	rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1352 
1353 	while (rate_idx != IWL_RATE_INVALID) {
1354 		if (target_tpt < (100 * tpt_tbl[rate_idx]))
1355 			break;
1356 
1357 		high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1358 						tbl->rate.type);
1359 
1360 		rate_idx = (high_low >> 8) & 0xff;
1361 	}
1362 
1363 	IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1364 		       rate_idx, target_tpt,
1365 		       rate_idx != IWL_RATE_INVALID ?
1366 		       100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1367 
1368 	return rate_idx;
1369 }
1370 
1371 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1372 {
1373 	struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->deflink.vht_cap;
1374 	struct ieee80211_vht_cap vht_cap = {
1375 		.vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1376 		.supp_mcs = sta_vht_cap->vht_mcs,
1377 	};
1378 
1379 	switch (sta->deflink.bandwidth) {
1380 	case IEEE80211_STA_RX_BW_160:
1381 		/*
1382 		 * Don't use 160 MHz if VHT extended NSS support
1383 		 * says we cannot use 2 streams, we don't want to
1384 		 * deal with this.
1385 		 * We only check MCS 0 - they will support that if
1386 		 * we got here at all and we don't care which MCS,
1387 		 * we want to determine a more global state.
1388 		 */
1389 		if (ieee80211_get_vht_max_nss(&vht_cap,
1390 					      IEEE80211_VHT_CHANWIDTH_160MHZ,
1391 					      0, true,
1392 					      sta->deflink.rx_nss) < sta->deflink.rx_nss)
1393 			return RATE_MCS_CHAN_WIDTH_80;
1394 		return RATE_MCS_CHAN_WIDTH_160;
1395 	case IEEE80211_STA_RX_BW_80:
1396 		return RATE_MCS_CHAN_WIDTH_80;
1397 	case IEEE80211_STA_RX_BW_40:
1398 		return RATE_MCS_CHAN_WIDTH_40;
1399 	case IEEE80211_STA_RX_BW_20:
1400 	default:
1401 		return RATE_MCS_CHAN_WIDTH_20;
1402 	}
1403 }
1404 
1405 /*
1406  * Check whether we should continue using same modulation mode, or
1407  * begin search for a new mode, based on:
1408  * 1) # tx successes or failures while using this mode
1409  * 2) # times calling this function
1410  * 3) elapsed time in this mode (not used, for now)
1411  */
1412 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1413 {
1414 	struct iwl_scale_tbl_info *tbl;
1415 	int active_tbl;
1416 	int flush_interval_passed = 0;
1417 	struct iwl_mvm *mvm;
1418 
1419 	mvm = lq_sta->pers.drv;
1420 	active_tbl = lq_sta->active_tbl;
1421 
1422 	tbl = &(lq_sta->lq_info[active_tbl]);
1423 
1424 	/* If we've been disallowing search, see if we should now allow it */
1425 	if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1426 		/* Elapsed time using current modulation mode */
1427 		if (lq_sta->flush_timer)
1428 			flush_interval_passed =
1429 				time_after(jiffies,
1430 					   (unsigned long)(lq_sta->flush_timer +
1431 							   (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1432 
1433 		/*
1434 		 * Check if we should allow search for new modulation mode.
1435 		 * If many frames have failed or succeeded, or we've used
1436 		 * this same modulation for a long time, allow search, and
1437 		 * reset history stats that keep track of whether we should
1438 		 * allow a new search.  Also (below) reset all bitmaps and
1439 		 * stats in active history.
1440 		 */
1441 		if (force_search ||
1442 		    (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1443 		    (lq_sta->total_success > lq_sta->max_success_limit) ||
1444 		    ((!lq_sta->search_better_tbl) &&
1445 		     (lq_sta->flush_timer) && (flush_interval_passed))) {
1446 			IWL_DEBUG_RATE(mvm,
1447 				       "LQ: stay is expired %d %d %d\n",
1448 				     lq_sta->total_failed,
1449 				     lq_sta->total_success,
1450 				     flush_interval_passed);
1451 
1452 			/* Allow search for new mode */
1453 			lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1454 			IWL_DEBUG_RATE(mvm,
1455 				       "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1456 			lq_sta->total_failed = 0;
1457 			lq_sta->total_success = 0;
1458 			lq_sta->flush_timer = 0;
1459 			/* mark the current column as visited */
1460 			lq_sta->visited_columns = BIT(tbl->column);
1461 		/*
1462 		 * Else if we've used this modulation mode enough repetitions
1463 		 * (regardless of elapsed time or success/failure), reset
1464 		 * history bitmaps and rate-specific stats for all rates in
1465 		 * active table.
1466 		 */
1467 		} else {
1468 			lq_sta->table_count++;
1469 			if (lq_sta->table_count >=
1470 			    lq_sta->table_count_limit) {
1471 				lq_sta->table_count = 0;
1472 
1473 				IWL_DEBUG_RATE(mvm,
1474 					       "LQ: stay in table clear win\n");
1475 				rs_rate_scale_clear_tbl_windows(mvm, tbl);
1476 			}
1477 		}
1478 
1479 		/* If transitioning to allow "search", reset all history
1480 		 * bitmaps and stats in active table (this will become the new
1481 		 * "search" table). */
1482 		if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1483 			rs_rate_scale_clear_tbl_windows(mvm, tbl);
1484 		}
1485 	}
1486 }
1487 
1488 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1489 			     struct iwl_scale_tbl_info *tbl,
1490 			     enum rs_action scale_action)
1491 {
1492 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1493 	struct ieee80211_bss_conf *bss_conf = &mvmsta->vif->bss_conf;
1494 	int i;
1495 
1496 	sta->deflink.agg.max_amsdu_len =
1497 		rs_fw_get_max_amsdu_len(sta, bss_conf, &sta->deflink);
1498 
1499 	/*
1500 	 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1501 	 * or 0, since there is no per-TID alg.
1502 	 */
1503 	if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1504 	    tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1505 	    scale_action == RS_ACTION_DOWNSCALE)
1506 		mvmsta->amsdu_enabled = 0;
1507 	else
1508 		mvmsta->amsdu_enabled = 0xFFFF;
1509 
1510 	if (bss_conf->he_support &&
1511 	    !iwlwifi_mod_params.disable_11ax)
1512 		mvmsta->max_amsdu_len = sta->deflink.agg.max_amsdu_len;
1513 	else
1514 		mvmsta->max_amsdu_len =
1515 			min_t(int, sta->deflink.agg.max_amsdu_len, 8500);
1516 
1517 	sta->deflink.agg.max_rc_amsdu_len = mvmsta->max_amsdu_len;
1518 
1519 	for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1520 		if (mvmsta->amsdu_enabled)
1521 			sta->deflink.agg.max_tid_amsdu_len[i] =
1522 				iwl_mvm_max_amsdu_size(mvm, sta, i);
1523 		else
1524 			/*
1525 			 * Not so elegant, but this will effectively
1526 			 * prevent AMSDU on this TID
1527 			 */
1528 			sta->deflink.agg.max_tid_amsdu_len[i] = 1;
1529 	}
1530 }
1531 
1532 /*
1533  * setup rate table in uCode
1534  */
1535 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1536 			       struct ieee80211_sta *sta,
1537 			       struct iwl_lq_sta *lq_sta,
1538 			       struct iwl_scale_tbl_info *tbl)
1539 {
1540 	rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1541 	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1542 }
1543 
1544 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1545 			      struct ieee80211_sta *sta,
1546 			      struct iwl_lq_sta *lq_sta,
1547 			      struct iwl_scale_tbl_info *tbl,
1548 			      enum rs_action scale_action)
1549 {
1550 	if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1551 		return false;
1552 
1553 	if (!is_vht_siso(&tbl->rate))
1554 		return false;
1555 
1556 	if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1557 	    (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1558 	    (scale_action == RS_ACTION_DOWNSCALE)) {
1559 		tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1560 		tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1561 		IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1562 		goto tweaked;
1563 	}
1564 
1565 	/* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1566 	 * sustainable, i.e. we're past the test window. We can't go back
1567 	 * if MCS5 is just tested as this will happen always after switching
1568 	 * to 20Mhz MCS4 because the rate stats are cleared.
1569 	 */
1570 	if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1571 	    (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1572 	     (scale_action == RS_ACTION_STAY)) ||
1573 	     ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1574 	      (scale_action == RS_ACTION_UPSCALE)))) {
1575 		tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1576 		tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1577 		IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1578 		goto tweaked;
1579 	}
1580 
1581 	return false;
1582 
1583 tweaked:
1584 	rs_set_expected_tpt_table(lq_sta, tbl);
1585 	rs_rate_scale_clear_tbl_windows(mvm, tbl);
1586 	return true;
1587 }
1588 
1589 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1590 					 struct iwl_lq_sta *lq_sta,
1591 					 struct ieee80211_sta *sta,
1592 					 struct iwl_scale_tbl_info *tbl)
1593 {
1594 	int i, j, max_rate;
1595 	enum rs_column next_col_id;
1596 	const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1597 	const struct rs_tx_column *next_col;
1598 	allow_column_func_t allow_func;
1599 	u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1600 	const u16 *expected_tpt_tbl;
1601 	u16 tpt, max_expected_tpt;
1602 
1603 	for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1604 		next_col_id = curr_col->next_columns[i];
1605 
1606 		if (next_col_id == RS_COLUMN_INVALID)
1607 			continue;
1608 
1609 		if (lq_sta->visited_columns & BIT(next_col_id)) {
1610 			IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1611 				       next_col_id);
1612 			continue;
1613 		}
1614 
1615 		next_col = &rs_tx_columns[next_col_id];
1616 
1617 		if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1618 			IWL_DEBUG_RATE(mvm,
1619 				       "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1620 				       next_col_id, valid_ants, next_col->ant);
1621 			continue;
1622 		}
1623 
1624 		for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1625 			allow_func = next_col->checks[j];
1626 			if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1627 						      next_col))
1628 				break;
1629 		}
1630 
1631 		if (j != MAX_COLUMN_CHECKS) {
1632 			IWL_DEBUG_RATE(mvm,
1633 				       "Skip column %d: not allowed (check %d failed)\n",
1634 				       next_col_id, j);
1635 
1636 			continue;
1637 		}
1638 
1639 		tpt = lq_sta->last_tpt / 100;
1640 		expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1641 						     rs_bw_from_sta_bw(sta));
1642 		if (WARN_ON_ONCE(!expected_tpt_tbl))
1643 			continue;
1644 
1645 		max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1646 		if (max_rate == IWL_RATE_INVALID) {
1647 			IWL_DEBUG_RATE(mvm,
1648 				       "Skip column %d: no rate is allowed in this column\n",
1649 				       next_col_id);
1650 			continue;
1651 		}
1652 
1653 		max_expected_tpt = expected_tpt_tbl[max_rate];
1654 		if (tpt >= max_expected_tpt) {
1655 			IWL_DEBUG_RATE(mvm,
1656 				       "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1657 				       next_col_id, max_expected_tpt, tpt);
1658 			continue;
1659 		}
1660 
1661 		IWL_DEBUG_RATE(mvm,
1662 			       "Found potential column %d. Max expected %d current %d\n",
1663 			       next_col_id, max_expected_tpt, tpt);
1664 		break;
1665 	}
1666 
1667 	if (i == MAX_NEXT_COLUMNS)
1668 		return RS_COLUMN_INVALID;
1669 
1670 	return next_col_id;
1671 }
1672 
1673 static int rs_switch_to_column(struct iwl_mvm *mvm,
1674 			       struct iwl_lq_sta *lq_sta,
1675 			       struct ieee80211_sta *sta,
1676 			       enum rs_column col_id)
1677 {
1678 	struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1679 	struct iwl_scale_tbl_info *search_tbl =
1680 		&lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1681 	struct rs_rate *rate = &search_tbl->rate;
1682 	const struct rs_tx_column *column = &rs_tx_columns[col_id];
1683 	const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1684 	unsigned long rate_mask = 0;
1685 	u32 rate_idx = 0;
1686 
1687 	memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1688 
1689 	rate->sgi = column->sgi;
1690 	rate->ant = column->ant;
1691 
1692 	if (column->mode == RS_LEGACY) {
1693 		if (lq_sta->band == NL80211_BAND_5GHZ)
1694 			rate->type = LQ_LEGACY_A;
1695 		else
1696 			rate->type = LQ_LEGACY_G;
1697 
1698 		rate->bw = RATE_MCS_CHAN_WIDTH_20;
1699 		rate->ldpc = false;
1700 		rate_mask = lq_sta->active_legacy_rate;
1701 	} else if (column->mode == RS_SISO) {
1702 		rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1703 		rate_mask = lq_sta->active_siso_rate;
1704 	} else if (column->mode == RS_MIMO2) {
1705 		rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1706 		rate_mask = lq_sta->active_mimo2_rate;
1707 	} else {
1708 		WARN_ONCE(1, "Bad column mode");
1709 	}
1710 
1711 	if (column->mode != RS_LEGACY) {
1712 		rate->bw = rs_bw_from_sta_bw(sta);
1713 		rate->ldpc = lq_sta->ldpc;
1714 	}
1715 
1716 	search_tbl->column = col_id;
1717 	rs_set_expected_tpt_table(lq_sta, search_tbl);
1718 
1719 	lq_sta->visited_columns |= BIT(col_id);
1720 
1721 	/* Get the best matching rate if we're changing modes. e.g.
1722 	 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1723 	 */
1724 	if (curr_column->mode != column->mode) {
1725 		rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1726 					    rate_mask, rate->index);
1727 
1728 		if ((rate_idx == IWL_RATE_INVALID) ||
1729 		    !(BIT(rate_idx) & rate_mask)) {
1730 			IWL_DEBUG_RATE(mvm,
1731 				       "can not switch with index %d"
1732 				       " rate mask %lx\n",
1733 				       rate_idx, rate_mask);
1734 
1735 			goto err;
1736 		}
1737 
1738 		rate->index = rate_idx;
1739 	}
1740 
1741 	IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1742 		       col_id, rate->index);
1743 
1744 	return 0;
1745 
1746 err:
1747 	rate->type = LQ_NONE;
1748 	return -1;
1749 }
1750 
1751 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1752 					 struct iwl_scale_tbl_info *tbl,
1753 					 s32 sr, int low, int high,
1754 					 int current_tpt,
1755 					 int low_tpt, int high_tpt)
1756 {
1757 	enum rs_action action = RS_ACTION_STAY;
1758 
1759 	if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1760 	    (current_tpt == 0)) {
1761 		IWL_DEBUG_RATE(mvm,
1762 			       "Decrease rate because of low SR\n");
1763 		return RS_ACTION_DOWNSCALE;
1764 	}
1765 
1766 	if ((low_tpt == IWL_INVALID_VALUE) &&
1767 	    (high_tpt == IWL_INVALID_VALUE) &&
1768 	    (high != IWL_RATE_INVALID)) {
1769 		IWL_DEBUG_RATE(mvm,
1770 			       "No data about high/low rates. Increase rate\n");
1771 		return RS_ACTION_UPSCALE;
1772 	}
1773 
1774 	if ((high_tpt == IWL_INVALID_VALUE) &&
1775 	    (high != IWL_RATE_INVALID) &&
1776 	    (low_tpt != IWL_INVALID_VALUE) &&
1777 	    (low_tpt < current_tpt)) {
1778 		IWL_DEBUG_RATE(mvm,
1779 			       "No data about high rate and low rate is worse. Increase rate\n");
1780 		return RS_ACTION_UPSCALE;
1781 	}
1782 
1783 	if ((high_tpt != IWL_INVALID_VALUE) &&
1784 	    (high_tpt > current_tpt)) {
1785 		IWL_DEBUG_RATE(mvm,
1786 			       "Higher rate is better. Increate rate\n");
1787 		return RS_ACTION_UPSCALE;
1788 	}
1789 
1790 	if ((low_tpt != IWL_INVALID_VALUE) &&
1791 	    (high_tpt != IWL_INVALID_VALUE) &&
1792 	    (low_tpt < current_tpt) &&
1793 	    (high_tpt < current_tpt)) {
1794 		IWL_DEBUG_RATE(mvm,
1795 			       "Both high and low are worse. Maintain rate\n");
1796 		return RS_ACTION_STAY;
1797 	}
1798 
1799 	if ((low_tpt != IWL_INVALID_VALUE) &&
1800 	    (low_tpt > current_tpt)) {
1801 		IWL_DEBUG_RATE(mvm,
1802 			       "Lower rate is better\n");
1803 		action = RS_ACTION_DOWNSCALE;
1804 		goto out;
1805 	}
1806 
1807 	if ((low_tpt == IWL_INVALID_VALUE) &&
1808 	    (low != IWL_RATE_INVALID)) {
1809 		IWL_DEBUG_RATE(mvm,
1810 			       "No data about lower rate\n");
1811 		action = RS_ACTION_DOWNSCALE;
1812 		goto out;
1813 	}
1814 
1815 	IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1816 
1817 out:
1818 	if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1819 		if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1820 			IWL_DEBUG_RATE(mvm,
1821 				       "SR is above NO DECREASE. Avoid downscale\n");
1822 			action = RS_ACTION_STAY;
1823 		} else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1824 			IWL_DEBUG_RATE(mvm,
1825 				       "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1826 			action = RS_ACTION_STAY;
1827 		} else {
1828 			IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1829 		}
1830 	}
1831 
1832 	return action;
1833 }
1834 
1835 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1836 			  struct iwl_lq_sta *lq_sta)
1837 {
1838 	/* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1839 	 * supports STBC of at least 1*SS
1840 	 */
1841 	if (!lq_sta->stbc_capable)
1842 		return false;
1843 
1844 	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1845 		return false;
1846 
1847 	return true;
1848 }
1849 
1850 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1851 				int *weaker, int *stronger)
1852 {
1853 	*weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1854 	if (*weaker > TPC_MAX_REDUCTION)
1855 		*weaker = TPC_INVALID;
1856 
1857 	*stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1858 	if (*stronger < 0)
1859 		*stronger = TPC_INVALID;
1860 }
1861 
1862 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1863 			   struct rs_rate *rate, enum nl80211_band band)
1864 {
1865 	int index = rate->index;
1866 	bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1867 	bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1868 				!vif->cfg.ps);
1869 
1870 	IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1871 		       cam, sta_ps_disabled);
1872 	/*
1873 	 * allow tpc only if power management is enabled, or bt coex
1874 	 * activity grade allows it and we are on 2.4Ghz.
1875 	 */
1876 	if ((cam || sta_ps_disabled) &&
1877 	    !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1878 		return false;
1879 
1880 	IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1881 	if (is_legacy(rate))
1882 		return index == IWL_RATE_54M_INDEX;
1883 	if (is_ht(rate))
1884 		return index == IWL_RATE_MCS_7_INDEX;
1885 	if (is_vht(rate))
1886 		return index == IWL_RATE_MCS_9_INDEX;
1887 
1888 	WARN_ON_ONCE(1);
1889 	return false;
1890 }
1891 
1892 enum tpc_action {
1893 	TPC_ACTION_STAY,
1894 	TPC_ACTION_DECREASE,
1895 	TPC_ACTION_INCREASE,
1896 	TPC_ACTION_NO_RESTIRCTION,
1897 };
1898 
1899 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1900 					 s32 sr, int weak, int strong,
1901 					 int current_tpt,
1902 					 int weak_tpt, int strong_tpt)
1903 {
1904 	/* stay until we have valid tpt */
1905 	if (current_tpt == IWL_INVALID_VALUE) {
1906 		IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1907 		return TPC_ACTION_STAY;
1908 	}
1909 
1910 	/* Too many failures, increase txp */
1911 	if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1912 	    current_tpt == 0) {
1913 		IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1914 		return TPC_ACTION_NO_RESTIRCTION;
1915 	}
1916 
1917 	/* try decreasing first if applicable */
1918 	if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1919 	    weak != TPC_INVALID) {
1920 		if (weak_tpt == IWL_INVALID_VALUE &&
1921 		    (strong_tpt == IWL_INVALID_VALUE ||
1922 		     current_tpt >= strong_tpt)) {
1923 			IWL_DEBUG_RATE(mvm,
1924 				       "no weak txp measurement. decrease txp\n");
1925 			return TPC_ACTION_DECREASE;
1926 		}
1927 
1928 		if (weak_tpt > current_tpt) {
1929 			IWL_DEBUG_RATE(mvm,
1930 				       "lower txp has better tpt. decrease txp\n");
1931 			return TPC_ACTION_DECREASE;
1932 		}
1933 	}
1934 
1935 	/* next, increase if needed */
1936 	if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1937 	    strong != TPC_INVALID) {
1938 		if (weak_tpt == IWL_INVALID_VALUE &&
1939 		    strong_tpt != IWL_INVALID_VALUE &&
1940 		    current_tpt < strong_tpt) {
1941 			IWL_DEBUG_RATE(mvm,
1942 				       "higher txp has better tpt. increase txp\n");
1943 			return TPC_ACTION_INCREASE;
1944 		}
1945 
1946 		if (weak_tpt < current_tpt &&
1947 		    (strong_tpt == IWL_INVALID_VALUE ||
1948 		     strong_tpt > current_tpt)) {
1949 			IWL_DEBUG_RATE(mvm,
1950 				       "lower txp has worse tpt. increase txp\n");
1951 			return TPC_ACTION_INCREASE;
1952 		}
1953 	}
1954 
1955 	IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1956 	return TPC_ACTION_STAY;
1957 }
1958 
1959 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1960 			   struct ieee80211_sta *sta,
1961 			   struct iwl_lq_sta *lq_sta,
1962 			   struct iwl_scale_tbl_info *tbl)
1963 {
1964 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1965 	struct ieee80211_vif *vif = mvm_sta->vif;
1966 	struct ieee80211_chanctx_conf *chanctx_conf;
1967 	enum nl80211_band band;
1968 	struct iwl_rate_scale_data *window;
1969 	struct rs_rate *rate = &tbl->rate;
1970 	enum tpc_action action;
1971 	s32 sr;
1972 	u8 cur = lq_sta->lq.reduced_tpc;
1973 	int current_tpt;
1974 	int weak, strong;
1975 	int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1976 
1977 #ifdef CONFIG_MAC80211_DEBUGFS
1978 	if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1979 		IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1980 			       lq_sta->pers.dbg_fixed_txp_reduction);
1981 		lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1982 		return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1983 	}
1984 #endif
1985 
1986 	rcu_read_lock();
1987 	chanctx_conf = rcu_dereference(vif->bss_conf.chanctx_conf);
1988 	if (WARN_ON(!chanctx_conf))
1989 		band = NUM_NL80211_BANDS;
1990 	else
1991 		band = chanctx_conf->def.chan->band;
1992 	rcu_read_unlock();
1993 
1994 	if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1995 		IWL_DEBUG_RATE(mvm,
1996 			       "tpc is not allowed. remove txp restrictions\n");
1997 		lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1998 		return cur != TPC_NO_REDUCTION;
1999 	}
2000 
2001 	rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2002 
2003 	/* Collect measured throughputs for current and adjacent rates */
2004 	window = tbl->tpc_win;
2005 	sr = window[cur].success_ratio;
2006 	current_tpt = window[cur].average_tpt;
2007 	if (weak != TPC_INVALID)
2008 		weak_tpt = window[weak].average_tpt;
2009 	if (strong != TPC_INVALID)
2010 		strong_tpt = window[strong].average_tpt;
2011 
2012 	IWL_DEBUG_RATE(mvm,
2013 		       "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2014 		       cur, current_tpt, sr, weak, strong,
2015 		       weak_tpt, strong_tpt);
2016 
2017 	action = rs_get_tpc_action(mvm, sr, weak, strong,
2018 				   current_tpt, weak_tpt, strong_tpt);
2019 
2020 	/* override actions if we are on the edge */
2021 	if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2022 		IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2023 		action = TPC_ACTION_STAY;
2024 	} else if (strong == TPC_INVALID &&
2025 		   (action == TPC_ACTION_INCREASE ||
2026 		    action == TPC_ACTION_NO_RESTIRCTION)) {
2027 		IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2028 		action = TPC_ACTION_STAY;
2029 	}
2030 
2031 	switch (action) {
2032 	case TPC_ACTION_DECREASE:
2033 		lq_sta->lq.reduced_tpc = weak;
2034 		return true;
2035 	case TPC_ACTION_INCREASE:
2036 		lq_sta->lq.reduced_tpc = strong;
2037 		return true;
2038 	case TPC_ACTION_NO_RESTIRCTION:
2039 		lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2040 		return true;
2041 	case TPC_ACTION_STAY:
2042 		/* do nothing */
2043 		break;
2044 	}
2045 	return false;
2046 }
2047 
2048 /*
2049  * Do rate scaling and search for new modulation mode.
2050  */
2051 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2052 				  struct ieee80211_sta *sta,
2053 				  struct iwl_lq_sta *lq_sta,
2054 				  int tid, bool ndp)
2055 {
2056 	int low = IWL_RATE_INVALID;
2057 	int high = IWL_RATE_INVALID;
2058 	int index;
2059 	struct iwl_rate_scale_data *window = NULL;
2060 	int current_tpt = IWL_INVALID_VALUE;
2061 	int low_tpt = IWL_INVALID_VALUE;
2062 	int high_tpt = IWL_INVALID_VALUE;
2063 	u32 fail_count;
2064 	enum rs_action scale_action = RS_ACTION_STAY;
2065 	u16 rate_mask;
2066 	u8 update_lq = 0;
2067 	struct iwl_scale_tbl_info *tbl, *tbl1;
2068 	u8 active_tbl = 0;
2069 	u8 done_search = 0;
2070 	u16 high_low;
2071 	s32 sr;
2072 	u8 prev_agg = lq_sta->is_agg;
2073 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2074 	struct rs_rate *rate;
2075 
2076 	lq_sta->is_agg = !!mvmsta->agg_tids;
2077 
2078 	/*
2079 	 * Select rate-scale / modulation-mode table to work with in
2080 	 * the rest of this function:  "search" if searching for better
2081 	 * modulation mode, or "active" if doing rate scaling within a mode.
2082 	 */
2083 	if (!lq_sta->search_better_tbl)
2084 		active_tbl = lq_sta->active_tbl;
2085 	else
2086 		active_tbl = rs_search_tbl(lq_sta->active_tbl);
2087 
2088 	tbl = &(lq_sta->lq_info[active_tbl]);
2089 	rate = &tbl->rate;
2090 
2091 	if (prev_agg != lq_sta->is_agg) {
2092 		IWL_DEBUG_RATE(mvm,
2093 			       "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2094 			       prev_agg, lq_sta->is_agg);
2095 		rs_set_expected_tpt_table(lq_sta, tbl);
2096 		rs_rate_scale_clear_tbl_windows(mvm, tbl);
2097 	}
2098 
2099 	/* current tx rate */
2100 	index = rate->index;
2101 
2102 	/* rates available for this association, and for modulation mode */
2103 	rate_mask = rs_get_supported_rates(lq_sta, rate);
2104 
2105 	if (!(BIT(index) & rate_mask)) {
2106 		IWL_ERR(mvm, "Current Rate is not valid\n");
2107 		if (lq_sta->search_better_tbl) {
2108 			/* revert to active table if search table is not valid*/
2109 			rate->type = LQ_NONE;
2110 			lq_sta->search_better_tbl = 0;
2111 			tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2112 			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2113 		}
2114 		return;
2115 	}
2116 
2117 	/* Get expected throughput table and history window for current rate */
2118 	if (!tbl->expected_tpt) {
2119 		IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2120 		return;
2121 	}
2122 
2123 	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2124 	window = &(tbl->win[index]);
2125 
2126 	/*
2127 	 * If there is not enough history to calculate actual average
2128 	 * throughput, keep analyzing results of more tx frames, without
2129 	 * changing rate or mode (bypass most of the rest of this function).
2130 	 * Set up new rate table in uCode only if old rate is not supported
2131 	 * in current association (use new rate found above).
2132 	 */
2133 	fail_count = window->counter - window->success_counter;
2134 	if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2135 	    (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2136 		IWL_DEBUG_RATE(mvm,
2137 			       "%s: Test Window: succ %d total %d\n",
2138 			       rs_pretty_rate(rate),
2139 			       window->success_counter, window->counter);
2140 
2141 		/* Can't calculate this yet; not enough history */
2142 		window->average_tpt = IWL_INVALID_VALUE;
2143 
2144 		/* Should we stay with this modulation mode,
2145 		 * or search for a new one? */
2146 		rs_stay_in_table(lq_sta, false);
2147 
2148 		return;
2149 	}
2150 
2151 	/* If we are searching for better modulation mode, check success. */
2152 	if (lq_sta->search_better_tbl) {
2153 		/* If good success, continue using the "search" mode;
2154 		 * no need to send new link quality command, since we're
2155 		 * continuing to use the setup that we've been trying. */
2156 		if (window->average_tpt > lq_sta->last_tpt) {
2157 			IWL_DEBUG_RATE(mvm,
2158 				       "SWITCHING TO NEW TABLE SR: %d "
2159 				       "cur-tpt %d old-tpt %d\n",
2160 				       window->success_ratio,
2161 				       window->average_tpt,
2162 				       lq_sta->last_tpt);
2163 
2164 			/* Swap tables; "search" becomes "active" */
2165 			lq_sta->active_tbl = active_tbl;
2166 			current_tpt = window->average_tpt;
2167 		/* Else poor success; go back to mode in "active" table */
2168 		} else {
2169 			IWL_DEBUG_RATE(mvm,
2170 				       "GOING BACK TO THE OLD TABLE: SR %d "
2171 				       "cur-tpt %d old-tpt %d\n",
2172 				       window->success_ratio,
2173 				       window->average_tpt,
2174 				       lq_sta->last_tpt);
2175 
2176 			/* Nullify "search" table */
2177 			rate->type = LQ_NONE;
2178 
2179 			/* Revert to "active" table */
2180 			active_tbl = lq_sta->active_tbl;
2181 			tbl = &(lq_sta->lq_info[active_tbl]);
2182 
2183 			/* Revert to "active" rate and throughput info */
2184 			index = tbl->rate.index;
2185 			current_tpt = lq_sta->last_tpt;
2186 
2187 			/* Need to set up a new rate table in uCode */
2188 			update_lq = 1;
2189 		}
2190 
2191 		/* Either way, we've made a decision; modulation mode
2192 		 * search is done, allow rate adjustment next time. */
2193 		lq_sta->search_better_tbl = 0;
2194 		done_search = 1;	/* Don't switch modes below! */
2195 		goto lq_update;
2196 	}
2197 
2198 	/* (Else) not in search of better modulation mode, try for better
2199 	 * starting rate, while staying in this mode. */
2200 	high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2201 	low = high_low & 0xff;
2202 	high = (high_low >> 8) & 0xff;
2203 
2204 	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2205 
2206 	sr = window->success_ratio;
2207 
2208 	/* Collect measured throughputs for current and adjacent rates */
2209 	current_tpt = window->average_tpt;
2210 	if (low != IWL_RATE_INVALID)
2211 		low_tpt = tbl->win[low].average_tpt;
2212 	if (high != IWL_RATE_INVALID)
2213 		high_tpt = tbl->win[high].average_tpt;
2214 
2215 	IWL_DEBUG_RATE(mvm,
2216 		       "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2217 		       rs_pretty_rate(rate), current_tpt, sr,
2218 		       low, high, low_tpt, high_tpt);
2219 
2220 	scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2221 					  current_tpt, low_tpt, high_tpt);
2222 
2223 	/* Force a search in case BT doesn't like us being in MIMO */
2224 	if (is_mimo(rate) &&
2225 	    !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2226 		IWL_DEBUG_RATE(mvm,
2227 			       "BT Coex forbids MIMO. Search for new config\n");
2228 		rs_stay_in_table(lq_sta, true);
2229 		goto lq_update;
2230 	}
2231 
2232 	switch (scale_action) {
2233 	case RS_ACTION_DOWNSCALE:
2234 		/* Decrease starting rate, update uCode's rate table */
2235 		if (low != IWL_RATE_INVALID) {
2236 			update_lq = 1;
2237 			index = low;
2238 		} else {
2239 			IWL_DEBUG_RATE(mvm,
2240 				       "At the bottom rate. Can't decrease\n");
2241 		}
2242 
2243 		break;
2244 	case RS_ACTION_UPSCALE:
2245 		/* Increase starting rate, update uCode's rate table */
2246 		if (high != IWL_RATE_INVALID) {
2247 			update_lq = 1;
2248 			index = high;
2249 		} else {
2250 			IWL_DEBUG_RATE(mvm,
2251 				       "At the top rate. Can't increase\n");
2252 		}
2253 
2254 		break;
2255 	case RS_ACTION_STAY:
2256 		/* No change */
2257 		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2258 			update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2259 		break;
2260 	default:
2261 		break;
2262 	}
2263 
2264 lq_update:
2265 	/* Replace uCode's rate table for the destination station. */
2266 	if (update_lq) {
2267 		tbl->rate.index = index;
2268 		if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2269 			rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2270 		rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2271 		rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2272 	}
2273 
2274 	rs_stay_in_table(lq_sta, false);
2275 
2276 	/*
2277 	 * Search for new modulation mode if we're:
2278 	 * 1)  Not changing rates right now
2279 	 * 2)  Not just finishing up a search
2280 	 * 3)  Allowing a new search
2281 	 */
2282 	if (!update_lq && !done_search &&
2283 	    lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2284 	    && window->counter) {
2285 		enum rs_column next_column;
2286 
2287 		/* Save current throughput to compare with "search" throughput*/
2288 		lq_sta->last_tpt = current_tpt;
2289 
2290 		IWL_DEBUG_RATE(mvm,
2291 			       "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2292 			       update_lq, done_search, lq_sta->rs_state,
2293 			       window->counter);
2294 
2295 		next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2296 		if (next_column != RS_COLUMN_INVALID) {
2297 			int ret = rs_switch_to_column(mvm, lq_sta, sta,
2298 						      next_column);
2299 			if (!ret)
2300 				lq_sta->search_better_tbl = 1;
2301 		} else {
2302 			IWL_DEBUG_RATE(mvm,
2303 				       "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2304 			lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2305 		}
2306 
2307 		/* If new "search" mode was selected, set up in uCode table */
2308 		if (lq_sta->search_better_tbl) {
2309 			/* Access the "search" table, clear its history. */
2310 			tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2311 			rs_rate_scale_clear_tbl_windows(mvm, tbl);
2312 
2313 			/* Use new "search" start rate */
2314 			index = tbl->rate.index;
2315 
2316 			rs_dump_rate(mvm, &tbl->rate,
2317 				     "Switch to SEARCH TABLE:");
2318 			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2319 		} else {
2320 			done_search = 1;
2321 		}
2322 	}
2323 
2324 	if (!ndp)
2325 		rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2326 
2327 	if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2328 		tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2329 		rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2330 	}
2331 }
2332 
2333 struct rs_init_rate_info {
2334 	s8 rssi;
2335 	u8 rate_idx;
2336 };
2337 
2338 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2339 	{ -60, IWL_RATE_54M_INDEX },
2340 	{ -64, IWL_RATE_48M_INDEX },
2341 	{ -68, IWL_RATE_36M_INDEX },
2342 	{ -80, IWL_RATE_24M_INDEX },
2343 	{ -84, IWL_RATE_18M_INDEX },
2344 	{ -85, IWL_RATE_12M_INDEX },
2345 	{ -86, IWL_RATE_11M_INDEX },
2346 	{ -88, IWL_RATE_5M_INDEX  },
2347 	{ -90, IWL_RATE_2M_INDEX  },
2348 	{ S8_MIN, IWL_RATE_1M_INDEX },
2349 };
2350 
2351 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2352 	{ -60, IWL_RATE_54M_INDEX },
2353 	{ -64, IWL_RATE_48M_INDEX },
2354 	{ -72, IWL_RATE_36M_INDEX },
2355 	{ -80, IWL_RATE_24M_INDEX },
2356 	{ -84, IWL_RATE_18M_INDEX },
2357 	{ -85, IWL_RATE_12M_INDEX },
2358 	{ -87, IWL_RATE_9M_INDEX  },
2359 	{ S8_MIN, IWL_RATE_6M_INDEX },
2360 };
2361 
2362 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2363 	{ -60, IWL_RATE_MCS_7_INDEX },
2364 	{ -64, IWL_RATE_MCS_6_INDEX },
2365 	{ -68, IWL_RATE_MCS_5_INDEX },
2366 	{ -72, IWL_RATE_MCS_4_INDEX },
2367 	{ -80, IWL_RATE_MCS_3_INDEX },
2368 	{ -84, IWL_RATE_MCS_2_INDEX },
2369 	{ -85, IWL_RATE_MCS_1_INDEX },
2370 	{ S8_MIN, IWL_RATE_MCS_0_INDEX},
2371 };
2372 
2373 /* MCS index 9 is not valid for 20MHz VHT channel width,
2374  * but is ok for 40, 80 and 160MHz channels.
2375  */
2376 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2377 	{ -60, IWL_RATE_MCS_8_INDEX },
2378 	{ -64, IWL_RATE_MCS_7_INDEX },
2379 	{ -68, IWL_RATE_MCS_6_INDEX },
2380 	{ -72, IWL_RATE_MCS_5_INDEX },
2381 	{ -80, IWL_RATE_MCS_4_INDEX },
2382 	{ -84, IWL_RATE_MCS_3_INDEX },
2383 	{ -85, IWL_RATE_MCS_2_INDEX },
2384 	{ -87, IWL_RATE_MCS_1_INDEX },
2385 	{ S8_MIN, IWL_RATE_MCS_0_INDEX},
2386 };
2387 
2388 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2389 	{ -60, IWL_RATE_MCS_9_INDEX },
2390 	{ -64, IWL_RATE_MCS_8_INDEX },
2391 	{ -68, IWL_RATE_MCS_7_INDEX },
2392 	{ -72, IWL_RATE_MCS_6_INDEX },
2393 	{ -80, IWL_RATE_MCS_5_INDEX },
2394 	{ -84, IWL_RATE_MCS_4_INDEX },
2395 	{ -85, IWL_RATE_MCS_3_INDEX },
2396 	{ -87, IWL_RATE_MCS_2_INDEX },
2397 	{ -88, IWL_RATE_MCS_1_INDEX },
2398 	{ S8_MIN, IWL_RATE_MCS_0_INDEX },
2399 };
2400 
2401 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2402 
2403 /* Init the optimal rate based on STA caps
2404  * This combined with rssi is used to report the last tx rate
2405  * to userspace when we haven't transmitted enough frames.
2406  */
2407 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2408 				 struct ieee80211_sta *sta,
2409 				 struct iwl_lq_sta *lq_sta)
2410 {
2411 	struct rs_rate *rate = &lq_sta->optimal_rate;
2412 
2413 	if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2414 		rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2415 	else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2416 		rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2417 	else if (lq_sta->band == NL80211_BAND_5GHZ)
2418 		rate->type = LQ_LEGACY_A;
2419 	else
2420 		rate->type = LQ_LEGACY_G;
2421 
2422 	rate->bw = rs_bw_from_sta_bw(sta);
2423 	rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2424 
2425 	/* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2426 
2427 	if (is_mimo(rate)) {
2428 		lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2429 	} else if (is_siso(rate)) {
2430 		lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2431 	} else {
2432 		lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2433 
2434 		if (lq_sta->band == NL80211_BAND_5GHZ) {
2435 			lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2436 			lq_sta->optimal_nentries =
2437 				ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2438 		} else {
2439 			lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2440 			lq_sta->optimal_nentries =
2441 				ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2442 		}
2443 	}
2444 
2445 	if (is_vht(rate)) {
2446 		if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2447 			lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2448 			lq_sta->optimal_nentries =
2449 				ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2450 		} else {
2451 			lq_sta->optimal_rates = rs_optimal_rates_vht;
2452 			lq_sta->optimal_nentries =
2453 				ARRAY_SIZE(rs_optimal_rates_vht);
2454 		}
2455 	} else if (is_ht(rate)) {
2456 		lq_sta->optimal_rates = rs_optimal_rates_ht;
2457 		lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2458 	}
2459 }
2460 
2461 /* Compute the optimal rate index based on RSSI */
2462 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2463 					   struct iwl_lq_sta *lq_sta)
2464 {
2465 	struct rs_rate *rate = &lq_sta->optimal_rate;
2466 	int i;
2467 
2468 	rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2469 				     BITS_PER_LONG);
2470 
2471 	for (i = 0; i < lq_sta->optimal_nentries; i++) {
2472 		int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2473 
2474 		if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2475 		    (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2476 			rate->index = rate_idx;
2477 			break;
2478 		}
2479 	}
2480 
2481 	return rate;
2482 }
2483 
2484 /* Choose an initial legacy rate and antenna to use based on the RSSI
2485  * of last Rx
2486  */
2487 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2488 				struct ieee80211_sta *sta,
2489 				struct iwl_lq_sta *lq_sta,
2490 				enum nl80211_band band,
2491 				struct rs_rate *rate)
2492 {
2493 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2494 	int i, nentries;
2495 	unsigned long active_rate;
2496 	s8 best_rssi = S8_MIN;
2497 	u8 best_ant = ANT_NONE;
2498 	u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2499 	const struct rs_init_rate_info *initial_rates;
2500 
2501 	for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2502 		if (!(lq_sta->pers.chains & BIT(i)))
2503 			continue;
2504 
2505 		if (lq_sta->pers.chain_signal[i] > best_rssi) {
2506 			best_rssi = lq_sta->pers.chain_signal[i];
2507 			best_ant = BIT(i);
2508 		}
2509 	}
2510 
2511 	IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2512 		       iwl_rs_pretty_ant(best_ant), best_rssi);
2513 
2514 	if (best_ant != ANT_A && best_ant != ANT_B)
2515 		rate->ant = first_antenna(valid_tx_ant);
2516 	else
2517 		rate->ant = best_ant;
2518 
2519 	rate->sgi = false;
2520 	rate->ldpc = false;
2521 	rate->bw = RATE_MCS_CHAN_WIDTH_20;
2522 
2523 	rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2524 				     BITS_PER_LONG);
2525 
2526 	if (band == NL80211_BAND_5GHZ) {
2527 		rate->type = LQ_LEGACY_A;
2528 		initial_rates = rs_optimal_rates_5ghz_legacy;
2529 		nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2530 	} else {
2531 		rate->type = LQ_LEGACY_G;
2532 		initial_rates = rs_optimal_rates_24ghz_legacy;
2533 		nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2534 	}
2535 
2536 	if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2537 		goto out;
2538 
2539 	/* Start from a higher rate if the corresponding debug capability
2540 	 * is enabled. The rate is chosen according to AP capabilities.
2541 	 * In case of VHT/HT when the rssi is low fallback to the case of
2542 	 * legacy rates.
2543 	 */
2544 	if (sta->deflink.vht_cap.vht_supported &&
2545 	    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2546 		/*
2547 		 * In AP mode, when a new station associates, rs is initialized
2548 		 * immediately upon association completion, before the phy
2549 		 * context is updated with the association parameters, so the
2550 		 * sta bandwidth might be wider than the phy context allows.
2551 		 * To avoid this issue, always initialize rs with 20mhz
2552 		 * bandwidth rate, and after authorization, when the phy context
2553 		 * is already up-to-date, re-init rs with the correct bw.
2554 		 */
2555 		u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2556 				RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2557 
2558 		switch (bw) {
2559 		case RATE_MCS_CHAN_WIDTH_40:
2560 		case RATE_MCS_CHAN_WIDTH_80:
2561 		case RATE_MCS_CHAN_WIDTH_160:
2562 			initial_rates = rs_optimal_rates_vht;
2563 			nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2564 			break;
2565 		case RATE_MCS_CHAN_WIDTH_20:
2566 			initial_rates = rs_optimal_rates_vht_20mhz;
2567 			nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2568 			break;
2569 		default:
2570 			IWL_ERR(mvm, "Invalid BW %d\n",
2571 				sta->deflink.bandwidth);
2572 			goto out;
2573 		}
2574 
2575 		active_rate = lq_sta->active_siso_rate;
2576 		rate->type = LQ_VHT_SISO;
2577 		rate->bw = bw;
2578 	} else if (sta->deflink.ht_cap.ht_supported &&
2579 		   best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2580 		initial_rates = rs_optimal_rates_ht;
2581 		nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2582 		active_rate = lq_sta->active_siso_rate;
2583 		rate->type = LQ_HT_SISO;
2584 	} else {
2585 		active_rate = lq_sta->active_legacy_rate;
2586 	}
2587 
2588 	for (i = 0; i < nentries; i++) {
2589 		int rate_idx = initial_rates[i].rate_idx;
2590 
2591 		if ((best_rssi >= initial_rates[i].rssi) &&
2592 		    (BIT(rate_idx) & active_rate)) {
2593 			rate->index = rate_idx;
2594 			break;
2595 		}
2596 	}
2597 
2598 out:
2599 	rs_dump_rate(mvm, rate, "INITIAL");
2600 }
2601 
2602 /* Save info about RSSI of last Rx */
2603 void rs_update_last_rssi(struct iwl_mvm *mvm,
2604 			 struct iwl_mvm_sta *mvmsta,
2605 			 struct ieee80211_rx_status *rx_status)
2606 {
2607 	struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2608 	int i;
2609 
2610 	lq_sta->pers.chains = rx_status->chains;
2611 	lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2612 	lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2613 	lq_sta->pers.last_rssi = S8_MIN;
2614 
2615 	for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2616 		if (!(lq_sta->pers.chains & BIT(i)))
2617 			continue;
2618 
2619 		if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2620 			lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2621 	}
2622 }
2623 
2624 /*
2625  * rs_initialize_lq - Initialize a station's hardware rate table
2626  *
2627  * The uCode's station table contains a table of fallback rates
2628  * for automatic fallback during transmission.
2629  *
2630  * NOTE: This sets up a default set of values.  These will be replaced later
2631  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2632  *       rc80211_simple.
2633  *
2634  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2635  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2636  *       which requires station table entry to exist).
2637  */
2638 static void rs_initialize_lq(struct iwl_mvm *mvm,
2639 			     struct ieee80211_sta *sta,
2640 			     struct iwl_lq_sta *lq_sta,
2641 			     enum nl80211_band band)
2642 {
2643 	struct iwl_scale_tbl_info *tbl;
2644 	struct rs_rate *rate;
2645 	u8 active_tbl = 0;
2646 
2647 	if (!sta || !lq_sta)
2648 		return;
2649 
2650 	if (!lq_sta->search_better_tbl)
2651 		active_tbl = lq_sta->active_tbl;
2652 	else
2653 		active_tbl = rs_search_tbl(lq_sta->active_tbl);
2654 
2655 	tbl = &(lq_sta->lq_info[active_tbl]);
2656 	rate = &tbl->rate;
2657 
2658 	rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2659 	rs_init_optimal_rate(mvm, sta, lq_sta);
2660 
2661 	WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2662 		  "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2663 		  rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2664 		  mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2665 
2666 	tbl->column = rs_get_column_from_rate(rate);
2667 
2668 	rs_set_expected_tpt_table(lq_sta, tbl);
2669 	rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2670 	/* TODO restore station should remember the lq cmd */
2671 	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2672 }
2673 
2674 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2675 			    void *mvm_sta,
2676 			    struct ieee80211_tx_rate_control *txrc)
2677 {
2678 	struct iwl_op_mode *op_mode = mvm_r;
2679 	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2680 	struct sk_buff *skb = txrc->skb;
2681 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2682 	struct iwl_lq_sta *lq_sta;
2683 	struct rs_rate *optimal_rate;
2684 	u32 last_ucode_rate;
2685 
2686 	if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2687 		/* if vif isn't initialized mvm doesn't know about
2688 		 * this station, so don't do anything with the it
2689 		 */
2690 		mvm_sta = NULL;
2691 	}
2692 
2693 	if (!mvm_sta)
2694 		return;
2695 
2696 	lq_sta = mvm_sta;
2697 
2698 	spin_lock_bh(&lq_sta->pers.lock);
2699 	iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags,
2700 				     info->band, &info->control.rates[0]);
2701 	info->control.rates[0].count = 1;
2702 
2703 	/* Report the optimal rate based on rssi and STA caps if we haven't
2704 	 * converged yet (too little traffic) or exploring other modulations
2705 	 */
2706 	if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2707 		optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2708 		last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2709 							  optimal_rate);
2710 		iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band,
2711 					     &txrc->reported_rate);
2712 	}
2713 	spin_unlock_bh(&lq_sta->pers.lock);
2714 }
2715 
2716 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2717 			      gfp_t gfp)
2718 {
2719 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2720 	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2721 	struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2722 	struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2723 
2724 	IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2725 
2726 	lq_sta->pers.drv = mvm;
2727 #ifdef CONFIG_MAC80211_DEBUGFS
2728 	lq_sta->pers.dbg_fixed_rate = 0;
2729 	lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2730 	lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2731 #endif
2732 	lq_sta->pers.chains = 0;
2733 	memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2734 	lq_sta->pers.last_rssi = S8_MIN;
2735 
2736 	return lq_sta;
2737 }
2738 
2739 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2740 				       int nss)
2741 {
2742 	u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2743 		(0x3 << (2 * (nss - 1)));
2744 	rx_mcs >>= (2 * (nss - 1));
2745 
2746 	if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2747 		return IWL_RATE_MCS_7_INDEX;
2748 	else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2749 		return IWL_RATE_MCS_8_INDEX;
2750 	else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2751 		return IWL_RATE_MCS_9_INDEX;
2752 
2753 	WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2754 	return -1;
2755 }
2756 
2757 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2758 				     struct ieee80211_sta_vht_cap *vht_cap,
2759 				     struct iwl_lq_sta *lq_sta)
2760 {
2761 	int i;
2762 	int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2763 
2764 	if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2765 		for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2766 			if (i == IWL_RATE_9M_INDEX)
2767 				continue;
2768 
2769 			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2770 			if (i == IWL_RATE_MCS_9_INDEX &&
2771 			    sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2772 				continue;
2773 
2774 			lq_sta->active_siso_rate |= BIT(i);
2775 		}
2776 	}
2777 
2778 	if (sta->deflink.rx_nss < 2)
2779 		return;
2780 
2781 	highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2782 	if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2783 		for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2784 			if (i == IWL_RATE_9M_INDEX)
2785 				continue;
2786 
2787 			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2788 			if (i == IWL_RATE_MCS_9_INDEX &&
2789 			    sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2790 				continue;
2791 
2792 			lq_sta->active_mimo2_rate |= BIT(i);
2793 		}
2794 	}
2795 }
2796 
2797 static void rs_ht_init(struct iwl_mvm *mvm,
2798 		       struct ieee80211_sta *sta,
2799 		       struct iwl_lq_sta *lq_sta,
2800 		       struct ieee80211_sta_ht_cap *ht_cap)
2801 {
2802 	/* active_siso_rate mask includes 9 MBits (bit 5),
2803 	 * and CCK (bits 0-3), supp_rates[] does not;
2804 	 * shift to convert format, force 9 MBits off.
2805 	 */
2806 	lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2807 	lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2808 	lq_sta->active_siso_rate &= ~((u16)0x2);
2809 	lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2810 
2811 	lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2812 	lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2813 	lq_sta->active_mimo2_rate &= ~((u16)0x2);
2814 	lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2815 
2816 	if (mvm->cfg->ht_params->ldpc &&
2817 	    (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2818 		lq_sta->ldpc = true;
2819 
2820 	if (mvm->cfg->ht_params->stbc &&
2821 	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2822 	    (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2823 		lq_sta->stbc_capable = true;
2824 
2825 	lq_sta->is_vht = false;
2826 }
2827 
2828 static void rs_vht_init(struct iwl_mvm *mvm,
2829 			struct ieee80211_sta *sta,
2830 			struct iwl_lq_sta *lq_sta,
2831 			struct ieee80211_sta_vht_cap *vht_cap)
2832 {
2833 	rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2834 
2835 	if (mvm->cfg->ht_params->ldpc &&
2836 	    (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2837 		lq_sta->ldpc = true;
2838 
2839 	if (mvm->cfg->ht_params->stbc &&
2840 	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2841 	    (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2842 		lq_sta->stbc_capable = true;
2843 
2844 	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2845 	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2846 	    (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2847 		lq_sta->bfer_capable = true;
2848 
2849 	lq_sta->is_vht = true;
2850 }
2851 
2852 #ifdef CONFIG_IWLWIFI_DEBUGFS
2853 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2854 {
2855 	spin_lock_bh(&mvm->drv_stats_lock);
2856 	memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2857 	spin_unlock_bh(&mvm->drv_stats_lock);
2858 }
2859 
2860 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2861 {
2862 	u8 nss = 0;
2863 
2864 	spin_lock(&mvm->drv_stats_lock);
2865 
2866 	if (agg)
2867 		mvm->drv_rx_stats.agg_frames++;
2868 
2869 	mvm->drv_rx_stats.success_frames++;
2870 
2871 	switch (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) {
2872 	case RATE_MCS_CHAN_WIDTH_20:
2873 		mvm->drv_rx_stats.bw_20_frames++;
2874 		break;
2875 	case RATE_MCS_CHAN_WIDTH_40:
2876 		mvm->drv_rx_stats.bw_40_frames++;
2877 		break;
2878 	case RATE_MCS_CHAN_WIDTH_80:
2879 		mvm->drv_rx_stats.bw_80_frames++;
2880 		break;
2881 	case RATE_MCS_CHAN_WIDTH_160:
2882 		mvm->drv_rx_stats.bw_160_frames++;
2883 		break;
2884 	default:
2885 		WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2886 	}
2887 
2888 	if (rate & RATE_MCS_HT_MSK_V1) {
2889 		mvm->drv_rx_stats.ht_frames++;
2890 		nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) >> RATE_HT_MCS_NSS_POS_V1) + 1;
2891 	} else if (rate & RATE_MCS_VHT_MSK_V1) {
2892 		mvm->drv_rx_stats.vht_frames++;
2893 		nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
2894 	} else {
2895 		mvm->drv_rx_stats.legacy_frames++;
2896 	}
2897 
2898 	if (nss == 1)
2899 		mvm->drv_rx_stats.siso_frames++;
2900 	else if (nss == 2)
2901 		mvm->drv_rx_stats.mimo2_frames++;
2902 
2903 	if (rate & RATE_MCS_SGI_MSK_V1)
2904 		mvm->drv_rx_stats.sgi_frames++;
2905 	else
2906 		mvm->drv_rx_stats.ngi_frames++;
2907 
2908 	mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2909 	mvm->drv_rx_stats.last_frame_idx =
2910 		(mvm->drv_rx_stats.last_frame_idx + 1) %
2911 			ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2912 
2913 	spin_unlock(&mvm->drv_stats_lock);
2914 }
2915 #endif
2916 
2917 /*
2918  * Called after adding a new station to initialize rate scaling
2919  */
2920 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2921 			     enum nl80211_band band)
2922 {
2923 	int i, j;
2924 	struct ieee80211_hw *hw = mvm->hw;
2925 	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2926 	struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
2927 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2928 	struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2929 	struct ieee80211_supported_band *sband;
2930 	unsigned long supp; /* must be unsigned long for for_each_set_bit */
2931 
2932 	lockdep_assert_held(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
2933 
2934 	/* clear all non-persistent lq data */
2935 	memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2936 
2937 	sband = hw->wiphy->bands[band];
2938 
2939 	lq_sta->lq.sta_id = mvmsta->deflink.sta_id;
2940 	mvmsta->amsdu_enabled = 0;
2941 	mvmsta->max_amsdu_len = sta->cur->max_amsdu_len;
2942 
2943 	for (j = 0; j < LQ_SIZE; j++)
2944 		rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2945 
2946 	lq_sta->flush_timer = 0;
2947 	lq_sta->last_tx = jiffies;
2948 
2949 	IWL_DEBUG_RATE(mvm,
2950 		       "LQ: *** rate scale station global init for station %d ***\n",
2951 		       mvmsta->deflink.sta_id);
2952 	/* TODO: what is a good starting rate for STA? About middle? Maybe not
2953 	 * the lowest or the highest rate.. Could consider using RSSI from
2954 	 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2955 	 * after assoc.. */
2956 
2957 	lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2958 	lq_sta->band = sband->band;
2959 	/*
2960 	 * active legacy rates as per supported rates bitmap
2961 	 */
2962 	supp = sta->deflink.supp_rates[sband->band];
2963 	lq_sta->active_legacy_rate = 0;
2964 	for_each_set_bit(i, &supp, BITS_PER_LONG)
2965 		lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2966 
2967 	/* TODO: should probably account for rx_highest for both HT/VHT */
2968 	if (!vht_cap || !vht_cap->vht_supported)
2969 		rs_ht_init(mvm, sta, lq_sta, ht_cap);
2970 	else
2971 		rs_vht_init(mvm, sta, lq_sta, vht_cap);
2972 
2973 	lq_sta->max_legacy_rate_idx =
2974 		rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2975 	lq_sta->max_siso_rate_idx =
2976 		rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2977 	lq_sta->max_mimo2_rate_idx =
2978 		rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2979 
2980 	IWL_DEBUG_RATE(mvm,
2981 		       "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2982 		       lq_sta->active_legacy_rate,
2983 		       lq_sta->active_siso_rate,
2984 		       lq_sta->active_mimo2_rate,
2985 		       lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2986 		       lq_sta->bfer_capable);
2987 	IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2988 		       lq_sta->max_legacy_rate_idx,
2989 		       lq_sta->max_siso_rate_idx,
2990 		       lq_sta->max_mimo2_rate_idx);
2991 
2992 	/* These values will be overridden later */
2993 	lq_sta->lq.single_stream_ant_msk =
2994 		iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
2995 	lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2996 
2997 	/* as default allow aggregation for all tids */
2998 	lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2999 	lq_sta->is_agg = 0;
3000 #ifdef CONFIG_IWLWIFI_DEBUGFS
3001 	iwl_mvm_reset_frame_stats(mvm);
3002 #endif
3003 	rs_initialize_lq(mvm, sta, lq_sta, band);
3004 }
3005 
3006 static void rs_drv_rate_update(void *mvm_r,
3007 			       struct ieee80211_supported_band *sband,
3008 			       struct cfg80211_chan_def *chandef,
3009 			       struct ieee80211_sta *sta,
3010 			       void *priv_sta, u32 changed)
3011 {
3012 	struct iwl_op_mode *op_mode = mvm_r;
3013 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3014 	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3015 	u8 tid;
3016 
3017 	if (!mvmsta->vif)
3018 		return;
3019 
3020 	/* Stop any ongoing aggregations as rs starts off assuming no agg */
3021 	for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3022 		ieee80211_stop_tx_ba_session(sta, tid);
3023 
3024 	iwl_mvm_rs_rate_init(mvm, mvmsta->vif, sta,
3025 			     &mvmsta->vif->bss_conf, &sta->deflink,
3026 			     sband->band);
3027 }
3028 
3029 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3030 				   struct ieee80211_sta *sta,
3031 				   int tid, struct ieee80211_tx_info *info,
3032 				   bool ndp)
3033 {
3034 	int legacy_success;
3035 	int retries;
3036 	int i;
3037 	struct iwl_lq_cmd *table;
3038 	u32 lq_hwrate;
3039 	struct rs_rate lq_rate, tx_resp_rate;
3040 	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3041 	u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3042 	u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3043 	u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3044 	u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3045 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3046 	struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
3047 
3048 	if (!lq_sta->pers.drv) {
3049 		IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3050 		return;
3051 	}
3052 
3053 	/* This packet was aggregated but doesn't carry status info */
3054 	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3055 	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
3056 		return;
3057 
3058 	if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3059 				    &tx_resp_rate)) {
3060 		WARN_ON_ONCE(1);
3061 		return;
3062 	}
3063 
3064 #ifdef CONFIG_MAC80211_DEBUGFS
3065 	/* Disable last tx check if we are debugging with fixed rate but
3066 	 * update tx stats
3067 	 */
3068 	if (lq_sta->pers.dbg_fixed_rate) {
3069 		int index = tx_resp_rate.index;
3070 		enum rs_column column;
3071 		int attempts, success;
3072 
3073 		column = rs_get_column_from_rate(&tx_resp_rate);
3074 		if (WARN_ONCE(column == RS_COLUMN_INVALID,
3075 			      "Can't map rate 0x%x to column",
3076 			      tx_resp_hwrate))
3077 			return;
3078 
3079 		if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3080 			attempts = info->status.ampdu_len;
3081 			success = info->status.ampdu_ack_len;
3082 		} else {
3083 			attempts = info->status.rates[0].count;
3084 			success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3085 		}
3086 
3087 		lq_sta->pers.tx_stats[column][index].total += attempts;
3088 		lq_sta->pers.tx_stats[column][index].success += success;
3089 
3090 		IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3091 			       tx_resp_hwrate, success, attempts);
3092 		return;
3093 	}
3094 #endif
3095 
3096 	if (time_after(jiffies,
3097 		       (unsigned long)(lq_sta->last_tx +
3098 				       (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3099 		IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3100 		/* reach here only in case of driver RS, call directly
3101 		 * the unlocked version
3102 		 */
3103 		rs_drv_rate_init(mvm, sta, info->band);
3104 		return;
3105 	}
3106 	lq_sta->last_tx = jiffies;
3107 
3108 	/* Ignore this Tx frame response if its initial rate doesn't match
3109 	 * that of latest Link Quality command.  There may be stragglers
3110 	 * from a previous Link Quality command, but we're no longer interested
3111 	 * in those; they're either from the "active" mode while we're trying
3112 	 * to check "search" mode, or a prior "search" mode after we've moved
3113 	 * to a new "search" mode (which might become the new "active" mode).
3114 	 */
3115 	table = &lq_sta->lq;
3116 	lq_hwrate = le32_to_cpu(table->rs_table[0]);
3117 	if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3118 		WARN_ON_ONCE(1);
3119 		return;
3120 	}
3121 
3122 	/* Here we actually compare this rate to the latest LQ command */
3123 	if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3124 		IWL_DEBUG_RATE(mvm,
3125 			       "tx resp color 0x%x does not match 0x%x\n",
3126 			       lq_color, LQ_FLAG_COLOR_GET(table->flags));
3127 
3128 		/* Since rates mis-match, the last LQ command may have failed.
3129 		 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3130 		 * ... driver.
3131 		 */
3132 		lq_sta->missed_rate_counter++;
3133 		if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3134 			lq_sta->missed_rate_counter = 0;
3135 			IWL_DEBUG_RATE(mvm,
3136 				       "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3137 				       lq_sta->rs_state);
3138 			iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3139 		}
3140 		/* Regardless, ignore this status info for outdated rate */
3141 		return;
3142 	}
3143 
3144 	/* Rate did match, so reset the missed_rate_counter */
3145 	lq_sta->missed_rate_counter = 0;
3146 
3147 	if (!lq_sta->search_better_tbl) {
3148 		curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3149 		other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3150 	} else {
3151 		curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3152 		other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3153 	}
3154 
3155 	if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3156 		IWL_DEBUG_RATE(mvm,
3157 			       "Neither active nor search matches tx rate\n");
3158 		tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3159 		rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3160 		tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3161 		rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3162 		rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3163 
3164 		/* no matching table found, let's by-pass the data collection
3165 		 * and continue to perform rate scale to find the rate table
3166 		 */
3167 		rs_stay_in_table(lq_sta, true);
3168 		goto done;
3169 	}
3170 
3171 	/* Updating the frame history depends on whether packets were
3172 	 * aggregated.
3173 	 *
3174 	 * For aggregation, all packets were transmitted at the same rate, the
3175 	 * first index into rate scale table.
3176 	 */
3177 	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3178 		rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3179 				    info->status.ampdu_len,
3180 				    info->status.ampdu_ack_len,
3181 				    reduced_txp);
3182 
3183 		/* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3184 		 * it as a single frame loss as we don't want the success ratio
3185 		 * to dip too quickly because a BA wasn't received.
3186 		 * For TPC, there's no need for this optimisation since we want
3187 		 * to recover very quickly from a bad power reduction and,
3188 		 * therefore we'd like the success ratio to get an immediate hit
3189 		 * when failing to get a BA, so we'd switch back to a lower or
3190 		 * zero power reduction. When FW transmits agg with a rate
3191 		 * different from the initial rate, it will not use reduced txp
3192 		 * and will send BA notification twice (one empty with reduced
3193 		 * txp equal to the value from LQ and one with reduced txp 0).
3194 		 * We need to update counters for each txp level accordingly.
3195 		 */
3196 		if (info->status.ampdu_ack_len == 0)
3197 			info->status.ampdu_len = 1;
3198 
3199 		rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3200 				    tx_resp_rate.index,
3201 				    info->status.ampdu_len,
3202 				    info->status.ampdu_ack_len);
3203 
3204 		/* Update success/fail counts if not searching for new mode */
3205 		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3206 			lq_sta->total_success += info->status.ampdu_ack_len;
3207 			lq_sta->total_failed += (info->status.ampdu_len -
3208 					info->status.ampdu_ack_len);
3209 		}
3210 	} else {
3211 		/* For legacy, update frame history with for each Tx retry. */
3212 		retries = info->status.rates[0].count - 1;
3213 		/* HW doesn't send more than 15 retries */
3214 		retries = min(retries, 15);
3215 
3216 		/* The last transmission may have been successful */
3217 		legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3218 		/* Collect data for each rate used during failed TX attempts */
3219 		for (i = 0; i <= retries; ++i) {
3220 			lq_hwrate = le32_to_cpu(table->rs_table[i]);
3221 			if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3222 						    &lq_rate)) {
3223 				WARN_ON_ONCE(1);
3224 				return;
3225 			}
3226 
3227 			/* Only collect stats if retried rate is in the same RS
3228 			 * table as active/search.
3229 			 */
3230 			if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3231 				tmp_tbl = curr_tbl;
3232 			else if (rs_rate_column_match(&lq_rate,
3233 						      &other_tbl->rate))
3234 				tmp_tbl = other_tbl;
3235 			else
3236 				continue;
3237 
3238 			rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3239 					    tx_resp_rate.index, 1,
3240 					    i < retries ? 0 : legacy_success,
3241 					    reduced_txp);
3242 			rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3243 					    tx_resp_rate.index, 1,
3244 					    i < retries ? 0 : legacy_success);
3245 		}
3246 
3247 		/* Update success/fail counts if not searching for new mode */
3248 		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3249 			lq_sta->total_success += legacy_success;
3250 			lq_sta->total_failed += retries + (1 - legacy_success);
3251 		}
3252 	}
3253 	/* The last TX rate is cached in lq_sta; it's set in if/else above */
3254 	lq_sta->last_rate_n_flags = lq_hwrate;
3255 	IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3256 done:
3257 	/* See if there's a better rate or modulation mode to try. */
3258 	if (sta->deflink.supp_rates[info->band])
3259 		rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3260 }
3261 
3262 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3263 			  int tid, struct ieee80211_tx_info *info, bool ndp)
3264 {
3265 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3266 
3267 	/* If it's locked we are in middle of init flow
3268 	 * just wait for next tx status to update the lq_sta data
3269 	 */
3270 	if (!spin_trylock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock))
3271 		return;
3272 
3273 	__iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3274 	spin_unlock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
3275 }
3276 
3277 #ifdef CONFIG_MAC80211_DEBUGFS
3278 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3279 					    struct iwl_lq_cmd *lq_cmd,
3280 					    enum nl80211_band band,
3281 					    u32 ucode_rate)
3282 {
3283 	struct rs_rate rate;
3284 	int i;
3285 	int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3286 	__le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3287 	u8 ant = (ucode_rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3288 
3289 	for (i = 0; i < num_rates; i++)
3290 		lq_cmd->rs_table[i] = ucode_rate_le32;
3291 
3292 	if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3293 		WARN_ON_ONCE(1);
3294 		return;
3295 	}
3296 
3297 	if (is_mimo(&rate))
3298 		lq_cmd->mimo_delim = num_rates - 1;
3299 	else
3300 		lq_cmd->mimo_delim = 0;
3301 
3302 	lq_cmd->reduced_tpc = 0;
3303 
3304 	if (num_of_ant(ant) == 1)
3305 		lq_cmd->single_stream_ant_msk = ant;
3306 
3307 	if (!mvm->trans->trans_cfg->gen2)
3308 		lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3309 	else
3310 		lq_cmd->agg_frame_cnt_limit =
3311 			LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3312 }
3313 #endif /* CONFIG_MAC80211_DEBUGFS */
3314 
3315 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3316 				     struct iwl_lq_sta *lq_sta,
3317 				     struct rs_rate *rate,
3318 				     __le32 *rs_table, int *rs_table_index,
3319 				     int num_rates, int num_retries,
3320 				     u8 valid_tx_ant, bool toggle_ant)
3321 {
3322 	int i, j;
3323 	__le32 ucode_rate;
3324 	bool bottom_reached = false;
3325 	int prev_rate_idx = rate->index;
3326 	int end = LINK_QUAL_MAX_RETRY_NUM;
3327 	int index = *rs_table_index;
3328 
3329 	for (i = 0; i < num_rates && index < end; i++) {
3330 		for (j = 0; j < num_retries && index < end; j++, index++) {
3331 			ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3332 									 rate));
3333 			rs_table[index] = ucode_rate;
3334 			if (toggle_ant)
3335 				rs_toggle_antenna(valid_tx_ant, rate);
3336 		}
3337 
3338 		prev_rate_idx = rate->index;
3339 		bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3340 		if (bottom_reached && !is_legacy(rate))
3341 			break;
3342 	}
3343 
3344 	if (!bottom_reached && !is_legacy(rate))
3345 		rate->index = prev_rate_idx;
3346 
3347 	*rs_table_index = index;
3348 }
3349 
3350 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3351  * column the rate table should look like this:
3352  *
3353  * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3354  * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3355  * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3356  * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3357  * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3358  * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3359  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3360  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3361  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3362  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3363  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3364  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3365  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3366  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3367  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3368  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3369  */
3370 static void rs_build_rates_table(struct iwl_mvm *mvm,
3371 				 struct ieee80211_sta *sta,
3372 				 struct iwl_lq_sta *lq_sta,
3373 				 const struct rs_rate *initial_rate)
3374 {
3375 	struct rs_rate rate;
3376 	int num_rates, num_retries, index = 0;
3377 	u8 valid_tx_ant = 0;
3378 	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3379 	bool toggle_ant = false;
3380 	u32 color;
3381 
3382 	memcpy(&rate, initial_rate, sizeof(rate));
3383 
3384 	valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3385 
3386 	/* TODO: remove old API when min FW API hits 14 */
3387 	if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3388 	    rs_stbc_allow(mvm, sta, lq_sta))
3389 		rate.stbc = true;
3390 
3391 	if (is_siso(&rate)) {
3392 		num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3393 		num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3394 	} else if (is_mimo(&rate)) {
3395 		num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3396 		num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3397 	} else {
3398 		num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3399 		num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3400 		toggle_ant = true;
3401 	}
3402 
3403 	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3404 				 num_rates, num_retries, valid_tx_ant,
3405 				 toggle_ant);
3406 
3407 	rs_get_lower_rate_down_column(lq_sta, &rate);
3408 
3409 	if (is_siso(&rate)) {
3410 		num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3411 		num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3412 		lq_cmd->mimo_delim = index;
3413 	} else if (is_legacy(&rate)) {
3414 		num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3415 		num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3416 	} else {
3417 		WARN_ON_ONCE(1);
3418 	}
3419 
3420 	toggle_ant = true;
3421 
3422 	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3423 				 num_rates, num_retries, valid_tx_ant,
3424 				 toggle_ant);
3425 
3426 	rs_get_lower_rate_down_column(lq_sta, &rate);
3427 
3428 	num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3429 	num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3430 
3431 	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3432 				 num_rates, num_retries, valid_tx_ant,
3433 				 toggle_ant);
3434 
3435 	/* update the color of the LQ command (as a counter at bits 1-3) */
3436 	color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3437 	lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3438 }
3439 
3440 struct rs_bfer_active_iter_data {
3441 	struct ieee80211_sta *exclude_sta;
3442 	struct iwl_mvm_sta *bfer_mvmsta;
3443 };
3444 
3445 static void rs_bfer_active_iter(void *_data,
3446 				struct ieee80211_sta *sta)
3447 {
3448 	struct rs_bfer_active_iter_data *data = _data;
3449 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3450 	struct iwl_lq_cmd *lq_cmd = &mvmsta->deflink.lq_sta.rs_drv.lq;
3451 	u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3452 
3453 	if (sta == data->exclude_sta)
3454 		return;
3455 
3456 	/* The current sta has BFER allowed */
3457 	if (ss_params & LQ_SS_BFER_ALLOWED) {
3458 		WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3459 
3460 		data->bfer_mvmsta = mvmsta;
3461 	}
3462 }
3463 
3464 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3465 {
3466 	int prio = -1;
3467 	enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3468 
3469 	switch (viftype) {
3470 	case NL80211_IFTYPE_AP:
3471 	case NL80211_IFTYPE_P2P_GO:
3472 		prio = 3;
3473 		break;
3474 	case NL80211_IFTYPE_P2P_CLIENT:
3475 		prio = 2;
3476 		break;
3477 	case NL80211_IFTYPE_STATION:
3478 		prio = 1;
3479 		break;
3480 	default:
3481 		WARN_ONCE(true, "viftype %d sta_id %d", viftype,
3482 			  sta->deflink.sta_id);
3483 		prio = -1;
3484 	}
3485 
3486 	return prio;
3487 }
3488 
3489 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3490 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3491 				struct iwl_mvm_sta *sta2)
3492 {
3493 	int prio1 = rs_bfer_priority(sta1);
3494 	int prio2 = rs_bfer_priority(sta2);
3495 
3496 	if (prio1 > prio2)
3497 		return 1;
3498 	if (prio1 < prio2)
3499 		return -1;
3500 	return 0;
3501 }
3502 
3503 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3504 				struct ieee80211_sta *sta,
3505 				struct iwl_lq_sta *lq_sta,
3506 				const struct rs_rate *initial_rate)
3507 {
3508 	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3509 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3510 	struct rs_bfer_active_iter_data data = {
3511 		.exclude_sta = sta,
3512 		.bfer_mvmsta = NULL,
3513 	};
3514 	struct iwl_mvm_sta *bfer_mvmsta = NULL;
3515 	u32 ss_params = LQ_SS_PARAMS_VALID;
3516 
3517 	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3518 		goto out;
3519 
3520 #ifdef CONFIG_MAC80211_DEBUGFS
3521 	/* Check if forcing the decision is configured.
3522 	 * Note that SISO is forced by not allowing STBC or BFER
3523 	 */
3524 	if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3525 		ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3526 	else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3527 		ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3528 
3529 	if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3530 		IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3531 			       lq_sta->pers.ss_force);
3532 		goto out;
3533 	}
3534 #endif
3535 
3536 	if (lq_sta->stbc_capable)
3537 		ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3538 
3539 	if (!lq_sta->bfer_capable)
3540 		goto out;
3541 
3542 	ieee80211_iterate_stations_atomic(mvm->hw,
3543 					  rs_bfer_active_iter,
3544 					  &data);
3545 	bfer_mvmsta = data.bfer_mvmsta;
3546 
3547 	/* This code is safe as it doesn't run concurrently for different
3548 	 * stations. This is guaranteed by the fact that calls to
3549 	 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3550 	 */
3551 	if (!bfer_mvmsta) {
3552 		IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3553 
3554 		ss_params |= LQ_SS_BFER_ALLOWED;
3555 		goto out;
3556 	}
3557 
3558 	IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3559 		       bfer_mvmsta->deflink.sta_id);
3560 
3561 	/* Disallow BFER on another STA if active and we're a higher priority */
3562 	if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3563 		struct iwl_lq_cmd *bfersta_lq_cmd =
3564 			&bfer_mvmsta->deflink.lq_sta.rs_drv.lq;
3565 		u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3566 
3567 		bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3568 		bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3569 		iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3570 
3571 		ss_params |= LQ_SS_BFER_ALLOWED;
3572 		IWL_DEBUG_RATE(mvm,
3573 			       "Lower priority BFER sta found (%d). Switch BFER\n",
3574 			       bfer_mvmsta->deflink.sta_id);
3575 	}
3576 out:
3577 	lq_cmd->ss_params = cpu_to_le32(ss_params);
3578 }
3579 
3580 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3581 			   struct ieee80211_sta *sta,
3582 			   struct iwl_lq_sta *lq_sta,
3583 			   const struct rs_rate *initial_rate)
3584 {
3585 	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3586 	struct iwl_mvm_sta *mvmsta;
3587 	struct iwl_mvm_vif *mvmvif;
3588 
3589 	lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3590 	lq_cmd->agg_time_limit =
3591 		cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3592 
3593 #ifdef CONFIG_MAC80211_DEBUGFS
3594 	if (lq_sta->pers.dbg_fixed_rate) {
3595 		rs_build_rates_table_from_fixed(mvm, lq_cmd,
3596 						lq_sta->band,
3597 						lq_sta->pers.dbg_fixed_rate);
3598 		return;
3599 	}
3600 #endif
3601 	if (WARN_ON_ONCE(!sta || !initial_rate))
3602 		return;
3603 
3604 	rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3605 
3606 	if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3607 		rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3608 
3609 	mvmsta = iwl_mvm_sta_from_mac80211(sta);
3610 	mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3611 
3612 	if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3613 	    num_of_ant(initial_rate->ant) == 1)
3614 		lq_cmd->single_stream_ant_msk = initial_rate->ant;
3615 
3616 	lq_cmd->agg_frame_cnt_limit = lq_sta->pers.max_agg_bufsize;
3617 
3618 	/*
3619 	 * In case of low latency, tell the firmware to leave a frame in the
3620 	 * Tx Fifo so that it can start a transaction in the same TxOP. This
3621 	 * basically allows the firmware to send bursts.
3622 	 */
3623 	if (iwl_mvm_vif_low_latency(mvmvif))
3624 		lq_cmd->agg_frame_cnt_limit--;
3625 
3626 	if (mvmsta->vif->p2p)
3627 		lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3628 
3629 	lq_cmd->agg_time_limit =
3630 			cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3631 }
3632 
3633 static void *rs_alloc(struct ieee80211_hw *hw)
3634 {
3635 	return hw->priv;
3636 }
3637 
3638 /* rate scale requires free function to be implemented */
3639 static void rs_free(void *mvm_rate)
3640 {
3641 	return;
3642 }
3643 
3644 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3645 {
3646 	struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3647 	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3648 
3649 	IWL_DEBUG_RATE(mvm, "enter\n");
3650 	IWL_DEBUG_RATE(mvm, "leave\n");
3651 }
3652 
3653 int rs_pretty_print_rate_v1(char *buf, int bufsz, const u32 rate)
3654 {
3655 
3656 	char *type;
3657 	u8 mcs = 0, nss = 0;
3658 	u8 ant = (rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3659 	u32 bw = (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) >>
3660 		RATE_MCS_CHAN_WIDTH_POS;
3661 
3662 	if (!(rate & RATE_MCS_HT_MSK_V1) &&
3663 	    !(rate & RATE_MCS_VHT_MSK_V1) &&
3664 	    !(rate & RATE_MCS_HE_MSK_V1)) {
3665 		int index = iwl_hwrate_to_plcp_idx(rate);
3666 
3667 		return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3668 				 iwl_rs_pretty_ant(ant),
3669 				 index == IWL_RATE_INVALID ? "BAD" :
3670 				 iwl_rate_mcs(index)->mbps);
3671 	}
3672 
3673 	if (rate & RATE_MCS_VHT_MSK_V1) {
3674 		type = "VHT";
3675 		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3676 		nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
3677 	} else if (rate & RATE_MCS_HT_MSK_V1) {
3678 		type = "HT";
3679 		mcs = rate & RATE_HT_MCS_INDEX_MSK_V1;
3680 		nss = ((rate & RATE_HT_MCS_NSS_MSK_V1)
3681 		       >> RATE_HT_MCS_NSS_POS_V1) + 1;
3682 	} else if (rate & RATE_MCS_HE_MSK_V1) {
3683 		type = "HE";
3684 		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3685 		nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
3686 	} else {
3687 		type = "Unknown"; /* shouldn't happen */
3688 	}
3689 
3690 	return scnprintf(buf, bufsz,
3691 			 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s",
3692 			 rate, type, iwl_rs_pretty_ant(ant), iwl_rs_pretty_bw(bw), mcs, nss,
3693 			 (rate & RATE_MCS_SGI_MSK_V1) ? "SGI " : "NGI ",
3694 			 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3695 			 (rate & RATE_MCS_LDPC_MSK_V1) ? "LDPC " : "",
3696 			 (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "",
3697 			 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3698 }
3699 
3700 #ifdef CONFIG_MAC80211_DEBUGFS
3701 /*
3702  * Program the device to use fixed rate for frame transmit
3703  * This is for debugging/testing only
3704  * once the device start use fixed rate, we need to reload the module
3705  * to being back the normal operation.
3706  */
3707 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3708 				struct iwl_lq_sta *lq_sta)
3709 {
3710 	lq_sta->active_legacy_rate = 0x0FFF;	/* 1 - 54 MBits, includes CCK */
3711 	lq_sta->active_siso_rate   = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
3712 	lq_sta->active_mimo2_rate  = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
3713 
3714 	IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3715 		       lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3716 
3717 	if (lq_sta->pers.dbg_fixed_rate) {
3718 		rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3719 		iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3720 	}
3721 }
3722 
3723 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3724 			const char __user *user_buf, size_t count, loff_t *ppos)
3725 {
3726 	struct iwl_lq_sta *lq_sta = file->private_data;
3727 	struct iwl_mvm *mvm;
3728 	char buf[64];
3729 	size_t buf_size;
3730 	u32 parsed_rate;
3731 
3732 	mvm = lq_sta->pers.drv;
3733 	memset(buf, 0, sizeof(buf));
3734 	buf_size = min(count, sizeof(buf) -  1);
3735 	if (copy_from_user(buf, user_buf, buf_size))
3736 		return -EFAULT;
3737 
3738 	if (sscanf(buf, "%x", &parsed_rate) == 1)
3739 		lq_sta->pers.dbg_fixed_rate = parsed_rate;
3740 	else
3741 		lq_sta->pers.dbg_fixed_rate = 0;
3742 
3743 	rs_program_fix_rate(mvm, lq_sta);
3744 
3745 	return count;
3746 }
3747 
3748 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3749 			char __user *user_buf, size_t count, loff_t *ppos)
3750 {
3751 	char *buff;
3752 	int desc = 0;
3753 	int i = 0;
3754 	ssize_t ret;
3755 	static const size_t bufsz = 2048;
3756 
3757 	struct iwl_lq_sta *lq_sta = file->private_data;
3758 	struct iwl_mvm_sta *mvmsta =
3759 		container_of(lq_sta, struct iwl_mvm_sta, deflink.lq_sta.rs_drv);
3760 	struct iwl_mvm *mvm;
3761 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3762 	struct rs_rate *rate = &tbl->rate;
3763 	u32 ss_params;
3764 
3765 	mvm = lq_sta->pers.drv;
3766 	buff = kmalloc(bufsz, GFP_KERNEL);
3767 	if (!buff)
3768 		return -ENOMEM;
3769 
3770 	desc += scnprintf(buff + desc, bufsz - desc,
3771 			  "sta_id %d\n", lq_sta->lq.sta_id);
3772 	desc += scnprintf(buff + desc, bufsz - desc,
3773 			  "failed=%d success=%d rate=0%lX\n",
3774 			  lq_sta->total_failed, lq_sta->total_success,
3775 			  lq_sta->active_legacy_rate);
3776 	desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3777 			  lq_sta->pers.dbg_fixed_rate);
3778 	desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s\n",
3779 	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3780 	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "");
3781 	desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3782 			  (is_legacy(rate)) ? "legacy" :
3783 			  is_vht(rate) ? "VHT" : "HT");
3784 	if (!is_legacy(rate)) {
3785 		desc += scnprintf(buff + desc, bufsz - desc, " %s",
3786 		   (is_siso(rate)) ? "SISO" : "MIMO2");
3787 		desc += scnprintf(buff + desc, bufsz - desc, " %s",
3788 				(is_ht20(rate)) ? "20MHz" :
3789 				(is_ht40(rate)) ? "40MHz" :
3790 				(is_ht80(rate)) ? "80MHz" :
3791 				(is_ht160(rate)) ? "160MHz" : "BAD BW");
3792 		desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3793 				(rate->sgi) ? "SGI" : "NGI",
3794 				(rate->ldpc) ? "LDPC" : "BCC",
3795 				(lq_sta->is_agg) ? "AGG on" : "",
3796 				(mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3797 	}
3798 	desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3799 			lq_sta->last_rate_n_flags);
3800 	desc += scnprintf(buff + desc, bufsz - desc,
3801 			"general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3802 			lq_sta->lq.flags,
3803 			lq_sta->lq.mimo_delim,
3804 			lq_sta->lq.single_stream_ant_msk,
3805 			lq_sta->lq.dual_stream_ant_msk);
3806 
3807 	desc += scnprintf(buff + desc, bufsz - desc,
3808 			"agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3809 			le16_to_cpu(lq_sta->lq.agg_time_limit),
3810 			lq_sta->lq.agg_disable_start_th,
3811 			lq_sta->lq.agg_frame_cnt_limit);
3812 
3813 	desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3814 			  lq_sta->lq.reduced_tpc);
3815 	ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3816 	desc += scnprintf(buff + desc, bufsz - desc,
3817 			"single stream params: %s%s%s%s\n",
3818 			(ss_params & LQ_SS_PARAMS_VALID) ?
3819 			"VALID" : "INVALID",
3820 			(ss_params & LQ_SS_BFER_ALLOWED) ?
3821 			", BFER" : "",
3822 			(ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3823 			", STBC" : "",
3824 			(ss_params & LQ_SS_FORCE) ?
3825 			", FORCE" : "");
3826 	desc += scnprintf(buff + desc, bufsz - desc,
3827 			"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3828 			lq_sta->lq.initial_rate_index[0],
3829 			lq_sta->lq.initial_rate_index[1],
3830 			lq_sta->lq.initial_rate_index[2],
3831 			lq_sta->lq.initial_rate_index[3]);
3832 
3833 	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3834 		u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3835 
3836 		desc += scnprintf(buff + desc, bufsz - desc,
3837 				  " rate[%d] 0x%X ", i, r);
3838 		desc += rs_pretty_print_rate_v1(buff + desc, bufsz - desc, r);
3839 		if (desc < bufsz - 1)
3840 			buff[desc++] = '\n';
3841 	}
3842 
3843 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3844 	kfree(buff);
3845 	return ret;
3846 }
3847 
3848 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3849 	.write = rs_sta_dbgfs_scale_table_write,
3850 	.read = rs_sta_dbgfs_scale_table_read,
3851 	.open = simple_open,
3852 	.llseek = default_llseek,
3853 };
3854 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3855 			char __user *user_buf, size_t count, loff_t *ppos)
3856 {
3857 	char *buff;
3858 	int desc = 0;
3859 	int i, j;
3860 	ssize_t ret;
3861 	struct iwl_scale_tbl_info *tbl;
3862 	struct rs_rate *rate;
3863 	struct iwl_lq_sta *lq_sta = file->private_data;
3864 
3865 	buff = kmalloc(1024, GFP_KERNEL);
3866 	if (!buff)
3867 		return -ENOMEM;
3868 
3869 	for (i = 0; i < LQ_SIZE; i++) {
3870 		tbl = &(lq_sta->lq_info[i]);
3871 		rate = &tbl->rate;
3872 		desc += sprintf(buff+desc,
3873 				"%s type=%d SGI=%d BW=%s DUP=0\n"
3874 				"index=%d\n",
3875 				lq_sta->active_tbl == i ? "*" : "x",
3876 				rate->type,
3877 				rate->sgi,
3878 				is_ht20(rate) ? "20MHz" :
3879 				is_ht40(rate) ? "40MHz" :
3880 				is_ht80(rate) ? "80MHz" :
3881 				is_ht160(rate) ? "160MHz" : "ERR",
3882 				rate->index);
3883 		for (j = 0; j < IWL_RATE_COUNT; j++) {
3884 			desc += sprintf(buff+desc,
3885 				"counter=%d success=%d %%=%d\n",
3886 				tbl->win[j].counter,
3887 				tbl->win[j].success_counter,
3888 				tbl->win[j].success_ratio);
3889 		}
3890 	}
3891 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3892 	kfree(buff);
3893 	return ret;
3894 }
3895 
3896 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3897 	.read = rs_sta_dbgfs_stats_table_read,
3898 	.open = simple_open,
3899 	.llseek = default_llseek,
3900 };
3901 
3902 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3903 					      char __user *user_buf,
3904 					      size_t count, loff_t *ppos)
3905 {
3906 	static const char * const column_name[] = {
3907 		[RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3908 		[RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3909 		[RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3910 		[RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3911 		[RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3912 		[RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3913 		[RS_COLUMN_MIMO2] = "MIMO2",
3914 		[RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3915 	};
3916 
3917 	static const char * const rate_name[] = {
3918 		[IWL_RATE_1M_INDEX] = "1M",
3919 		[IWL_RATE_2M_INDEX] = "2M",
3920 		[IWL_RATE_5M_INDEX] = "5.5M",
3921 		[IWL_RATE_11M_INDEX] = "11M",
3922 		[IWL_RATE_6M_INDEX] = "6M|MCS0",
3923 		[IWL_RATE_9M_INDEX] = "9M",
3924 		[IWL_RATE_12M_INDEX] = "12M|MCS1",
3925 		[IWL_RATE_18M_INDEX] = "18M|MCS2",
3926 		[IWL_RATE_24M_INDEX] = "24M|MCS3",
3927 		[IWL_RATE_36M_INDEX] = "36M|MCS4",
3928 		[IWL_RATE_48M_INDEX] = "48M|MCS5",
3929 		[IWL_RATE_54M_INDEX] = "54M|MCS6",
3930 		[IWL_RATE_MCS_7_INDEX] = "MCS7",
3931 		[IWL_RATE_MCS_8_INDEX] = "MCS8",
3932 		[IWL_RATE_MCS_9_INDEX] = "MCS9",
3933 		[IWL_RATE_MCS_10_INDEX] = "MCS10",
3934 		[IWL_RATE_MCS_11_INDEX] = "MCS11",
3935 	};
3936 
3937 	char *buff, *pos, *endpos;
3938 	int col, rate;
3939 	ssize_t ret;
3940 	struct iwl_lq_sta *lq_sta = file->private_data;
3941 	struct rs_rate_stats *stats;
3942 	static const size_t bufsz = 1024;
3943 
3944 	buff = kmalloc(bufsz, GFP_KERNEL);
3945 	if (!buff)
3946 		return -ENOMEM;
3947 
3948 	pos = buff;
3949 	endpos = pos + bufsz;
3950 
3951 	pos += scnprintf(pos, endpos - pos, "COLUMN,");
3952 	for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3953 		pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3954 	pos += scnprintf(pos, endpos - pos, "\n");
3955 
3956 	for (col = 0; col < RS_COLUMN_COUNT; col++) {
3957 		pos += scnprintf(pos, endpos - pos,
3958 				 "%s,", column_name[col]);
3959 
3960 		for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3961 			stats = &(lq_sta->pers.tx_stats[col][rate]);
3962 			pos += scnprintf(pos, endpos - pos,
3963 					 "%llu/%llu,",
3964 					 stats->success,
3965 					 stats->total);
3966 		}
3967 		pos += scnprintf(pos, endpos - pos, "\n");
3968 	}
3969 
3970 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3971 	kfree(buff);
3972 	return ret;
3973 }
3974 
3975 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3976 					       const char __user *user_buf,
3977 					       size_t count, loff_t *ppos)
3978 {
3979 	struct iwl_lq_sta *lq_sta = file->private_data;
3980 	memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3981 
3982 	return count;
3983 }
3984 
3985 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3986 	.read = rs_sta_dbgfs_drv_tx_stats_read,
3987 	.write = rs_sta_dbgfs_drv_tx_stats_write,
3988 	.open = simple_open,
3989 	.llseek = default_llseek,
3990 };
3991 
3992 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3993 				       char __user *user_buf,
3994 				       size_t count, loff_t *ppos)
3995 {
3996 	struct iwl_lq_sta *lq_sta = file->private_data;
3997 	char buf[12];
3998 	int bufsz = sizeof(buf);
3999 	int pos = 0;
4000 	static const char * const ss_force_name[] = {
4001 		[RS_SS_FORCE_NONE] = "none",
4002 		[RS_SS_FORCE_STBC] = "stbc",
4003 		[RS_SS_FORCE_BFER] = "bfer",
4004 		[RS_SS_FORCE_SISO] = "siso",
4005 	};
4006 
4007 	pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4008 			 ss_force_name[lq_sta->pers.ss_force]);
4009 	return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4010 }
4011 
4012 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4013 					size_t count, loff_t *ppos)
4014 {
4015 	struct iwl_mvm *mvm = lq_sta->pers.drv;
4016 	int ret = 0;
4017 
4018 	if (!strncmp("none", buf, 4)) {
4019 		lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4020 	} else if (!strncmp("siso", buf, 4)) {
4021 		lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4022 	} else if (!strncmp("stbc", buf, 4)) {
4023 		if (lq_sta->stbc_capable) {
4024 			lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4025 		} else {
4026 			IWL_ERR(mvm,
4027 				"can't force STBC. peer doesn't support\n");
4028 			ret = -EINVAL;
4029 		}
4030 	} else if (!strncmp("bfer", buf, 4)) {
4031 		if (lq_sta->bfer_capable) {
4032 			lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4033 		} else {
4034 			IWL_ERR(mvm,
4035 				"can't force BFER. peer doesn't support\n");
4036 			ret = -EINVAL;
4037 		}
4038 	} else {
4039 		IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4040 		ret = -EINVAL;
4041 	}
4042 	return ret ?: count;
4043 }
4044 
4045 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4046 	_MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4047 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {		\
4048 		debugfs_create_file(#name, mode, parent, lq_sta,	\
4049 				    &iwl_dbgfs_##name##_ops);		\
4050 	} while (0)
4051 
4052 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4053 
4054 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4055 				   struct dentry *dir)
4056 {
4057 	struct iwl_lq_sta *lq_sta = priv_sta;
4058 	struct iwl_mvm_sta *mvmsta;
4059 
4060 	mvmsta = container_of(lq_sta, struct iwl_mvm_sta,
4061 			      deflink.lq_sta.rs_drv);
4062 
4063 	if (!mvmsta->vif)
4064 		return;
4065 
4066 	debugfs_create_file("rate_scale_table", 0600, dir,
4067 			    lq_sta, &rs_sta_dbgfs_scale_table_ops);
4068 	debugfs_create_file("rate_stats_table", 0400, dir,
4069 			    lq_sta, &rs_sta_dbgfs_stats_table_ops);
4070 	debugfs_create_file("drv_tx_stats", 0600, dir,
4071 			    lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4072 	debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4073 			  &lq_sta->tx_agg_tid_en);
4074 	debugfs_create_u8("reduced_tpc", 0600, dir,
4075 			  &lq_sta->pers.dbg_fixed_txp_reduction);
4076 
4077 	MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4078 }
4079 #endif
4080 
4081 /*
4082  * Initialization of rate scaling information is done by driver after
4083  * the station is added. Since mac80211 calls this function before a
4084  * station is added we ignore it.
4085  */
4086 static void rs_rate_init_ops(void *mvm_r,
4087 			     struct ieee80211_supported_band *sband,
4088 			     struct cfg80211_chan_def *chandef,
4089 			     struct ieee80211_sta *sta, void *mvm_sta)
4090 {
4091 }
4092 
4093 /* ops for rate scaling implemented in the driver */
4094 static const struct rate_control_ops rs_mvm_ops_drv = {
4095 	.name = RS_NAME,
4096 	.tx_status = rs_drv_mac80211_tx_status,
4097 	.get_rate = rs_drv_get_rate,
4098 	.rate_init = rs_rate_init_ops,
4099 	.alloc = rs_alloc,
4100 	.free = rs_free,
4101 	.alloc_sta = rs_drv_alloc_sta,
4102 	.free_sta = rs_free_sta,
4103 	.rate_update = rs_drv_rate_update,
4104 #ifdef CONFIG_MAC80211_DEBUGFS
4105 	.add_sta_debugfs = rs_drv_add_sta_debugfs,
4106 #endif
4107 	.capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4108 };
4109 
4110 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm,
4111 			  struct ieee80211_vif *vif,
4112 			  struct ieee80211_sta *sta,
4113 			  struct ieee80211_bss_conf *link_conf,
4114 			  struct ieee80211_link_sta *link_sta,
4115 			  enum nl80211_band band)
4116 {
4117 	if (iwl_mvm_has_tlc_offload(mvm)) {
4118 		iwl_mvm_rs_fw_rate_init(mvm, vif, sta, link_conf,
4119 					link_sta, band);
4120 	} else {
4121 		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4122 
4123 		spin_lock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
4124 		rs_drv_rate_init(mvm, sta, band);
4125 		spin_unlock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
4126 	}
4127 }
4128 
4129 int iwl_mvm_rate_control_register(void)
4130 {
4131 	return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4132 }
4133 
4134 void iwl_mvm_rate_control_unregister(void)
4135 {
4136 	ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4137 }
4138 
4139 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4140 				bool enable)
4141 {
4142 	struct iwl_lq_cmd *lq = &mvmsta->deflink.lq_sta.rs_drv.lq;
4143 
4144 	lockdep_assert_held(&mvm->mutex);
4145 
4146 	if (enable) {
4147 		if (mvmsta->tx_protection == 0)
4148 			lq->flags |= LQ_FLAG_USE_RTS_MSK;
4149 		mvmsta->tx_protection++;
4150 	} else {
4151 		mvmsta->tx_protection--;
4152 		if (mvmsta->tx_protection == 0)
4153 			lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4154 	}
4155 
4156 	return iwl_mvm_send_lq_cmd(mvm, lq);
4157 }
4158 
4159 /**
4160  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4161  * @mvm: The mvm component
4162  * @mvmsta: The station
4163  * @enable: Enable Tx protection?
4164  */
4165 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4166 			  bool enable)
4167 {
4168 	if (iwl_mvm_has_tlc_offload(mvm))
4169 		return rs_fw_tx_protection(mvm, mvmsta, enable);
4170 	else
4171 		return rs_drv_tx_protection(mvm, mvmsta, enable);
4172 }
4173