xref: /linux/drivers/net/wireless/intel/iwlwifi/mvm/rs.c (revision 1f2367a39f17bd553a75e179a747f9b257bc9478)
1 /******************************************************************************
2  *
3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
5  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
6  * Copyright(c) 2018 - 2019 Intel Corporation
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of version 2 of the GNU General Public License as
10  * published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15  * more details.
16  *
17  * The full GNU General Public License is included in this distribution in the
18  * file called LICENSE.
19  *
20  * Contact Information:
21  *  Intel Linux Wireless <linuxwifi@intel.com>
22  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
23  *
24  *****************************************************************************/
25 #include <linux/kernel.h>
26 #include <linux/skbuff.h>
27 #include <linux/slab.h>
28 #include <net/mac80211.h>
29 
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/delay.h>
33 
34 #include <linux/workqueue.h>
35 #include "rs.h"
36 #include "fw-api.h"
37 #include "sta.h"
38 #include "iwl-op-mode.h"
39 #include "mvm.h"
40 #include "debugfs.h"
41 
42 #define IWL_RATE_MAX_WINDOW		62	/* # tx in history window */
43 
44 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
45  * Use this macro when dealing with thresholds consts set as a percentage
46  */
47 #define RS_PERCENT(x) (128 * x)
48 
49 static u8 rs_ht_to_legacy[] = {
50 	[IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
51 	[IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
52 	[IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
53 	[IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
54 	[IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
55 	[IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
56 	[IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
57 	[IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
58 	[IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
59 	[IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
60 };
61 
62 static const u8 ant_toggle_lookup[] = {
63 	[ANT_NONE] = ANT_NONE,
64 	[ANT_A] = ANT_B,
65 	[ANT_B] = ANT_A,
66 	[ANT_AB] = ANT_AB,
67 };
68 
69 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)			      \
70 	[IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,	      \
71 				    IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
72 				    IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
73 				    IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
74 				    IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
75 				    IWL_RATE_##rp##M_INDEX,	      \
76 				    IWL_RATE_##rn##M_INDEX }
77 
78 #define IWL_DECLARE_MCS_RATE(s)						  \
79 	[IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,		  \
80 				       IWL_RATE_HT_SISO_MCS_##s##_PLCP,	  \
81 				       IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
82 				       IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
83 				       IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
84 				       IWL_RATE_INVM_INDEX,	          \
85 				       IWL_RATE_INVM_INDEX }
86 
87 /*
88  * Parameter order:
89  *   rate, ht rate, prev rate, next rate
90  *
91  * If there isn't a valid next or previous rate then INV is used which
92  * maps to IWL_RATE_INVALID
93  *
94  */
95 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
96 	IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
97 	IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
98 	IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
99 	IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
100 	IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
101 	IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
102 	IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
103 	IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
104 	IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
105 	IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
106 	IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
107 	IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
108 	IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
109 	IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
110 	IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
111 };
112 
113 enum rs_action {
114 	RS_ACTION_STAY = 0,
115 	RS_ACTION_DOWNSCALE = -1,
116 	RS_ACTION_UPSCALE = 1,
117 };
118 
119 enum rs_column_mode {
120 	RS_INVALID = 0,
121 	RS_LEGACY,
122 	RS_SISO,
123 	RS_MIMO2,
124 };
125 
126 #define MAX_NEXT_COLUMNS 7
127 #define MAX_COLUMN_CHECKS 3
128 
129 struct rs_tx_column;
130 
131 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
132 				     struct ieee80211_sta *sta,
133 				     struct rs_rate *rate,
134 				     const struct rs_tx_column *next_col);
135 
136 struct rs_tx_column {
137 	enum rs_column_mode mode;
138 	u8 ant;
139 	bool sgi;
140 	enum rs_column next_columns[MAX_NEXT_COLUMNS];
141 	allow_column_func_t checks[MAX_COLUMN_CHECKS];
142 };
143 
144 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
145 			 struct rs_rate *rate,
146 			 const struct rs_tx_column *next_col)
147 {
148 	return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
149 }
150 
151 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
152 			  struct rs_rate *rate,
153 			  const struct rs_tx_column *next_col)
154 {
155 	if (!sta->ht_cap.ht_supported)
156 		return false;
157 
158 	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
159 		return false;
160 
161 	if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
162 		return false;
163 
164 	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
165 		return false;
166 
167 	if (mvm->nvm_data->sku_cap_mimo_disabled)
168 		return false;
169 
170 	return true;
171 }
172 
173 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
174 			  struct rs_rate *rate,
175 			  const struct rs_tx_column *next_col)
176 {
177 	if (!sta->ht_cap.ht_supported)
178 		return false;
179 
180 	return true;
181 }
182 
183 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
184 			 struct rs_rate *rate,
185 			 const struct rs_tx_column *next_col)
186 {
187 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
188 	struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
189 
190 	if (is_ht20(rate) && (ht_cap->cap &
191 			     IEEE80211_HT_CAP_SGI_20))
192 		return true;
193 	if (is_ht40(rate) && (ht_cap->cap &
194 			     IEEE80211_HT_CAP_SGI_40))
195 		return true;
196 	if (is_ht80(rate) && (vht_cap->cap &
197 			     IEEE80211_VHT_CAP_SHORT_GI_80))
198 		return true;
199 	if (is_ht160(rate) && (vht_cap->cap &
200 			     IEEE80211_VHT_CAP_SHORT_GI_160))
201 		return true;
202 
203 	return false;
204 }
205 
206 static const struct rs_tx_column rs_tx_columns[] = {
207 	[RS_COLUMN_LEGACY_ANT_A] = {
208 		.mode = RS_LEGACY,
209 		.ant = ANT_A,
210 		.next_columns = {
211 			RS_COLUMN_LEGACY_ANT_B,
212 			RS_COLUMN_SISO_ANT_A,
213 			RS_COLUMN_MIMO2,
214 			RS_COLUMN_INVALID,
215 			RS_COLUMN_INVALID,
216 			RS_COLUMN_INVALID,
217 			RS_COLUMN_INVALID,
218 		},
219 		.checks = {
220 			rs_ant_allow,
221 		},
222 	},
223 	[RS_COLUMN_LEGACY_ANT_B] = {
224 		.mode = RS_LEGACY,
225 		.ant = ANT_B,
226 		.next_columns = {
227 			RS_COLUMN_LEGACY_ANT_A,
228 			RS_COLUMN_SISO_ANT_B,
229 			RS_COLUMN_MIMO2,
230 			RS_COLUMN_INVALID,
231 			RS_COLUMN_INVALID,
232 			RS_COLUMN_INVALID,
233 			RS_COLUMN_INVALID,
234 		},
235 		.checks = {
236 			rs_ant_allow,
237 		},
238 	},
239 	[RS_COLUMN_SISO_ANT_A] = {
240 		.mode = RS_SISO,
241 		.ant = ANT_A,
242 		.next_columns = {
243 			RS_COLUMN_SISO_ANT_B,
244 			RS_COLUMN_MIMO2,
245 			RS_COLUMN_SISO_ANT_A_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_B] = {
257 		.mode = RS_SISO,
258 		.ant = ANT_B,
259 		.next_columns = {
260 			RS_COLUMN_SISO_ANT_A,
261 			RS_COLUMN_MIMO2,
262 			RS_COLUMN_SISO_ANT_B_SGI,
263 			RS_COLUMN_LEGACY_ANT_A,
264 			RS_COLUMN_LEGACY_ANT_B,
265 			RS_COLUMN_INVALID,
266 			RS_COLUMN_INVALID,
267 		},
268 		.checks = {
269 			rs_siso_allow,
270 			rs_ant_allow,
271 		},
272 	},
273 	[RS_COLUMN_SISO_ANT_A_SGI] = {
274 		.mode = RS_SISO,
275 		.ant = ANT_A,
276 		.sgi = true,
277 		.next_columns = {
278 			RS_COLUMN_SISO_ANT_B_SGI,
279 			RS_COLUMN_MIMO2_SGI,
280 			RS_COLUMN_SISO_ANT_A,
281 			RS_COLUMN_LEGACY_ANT_A,
282 			RS_COLUMN_LEGACY_ANT_B,
283 			RS_COLUMN_INVALID,
284 			RS_COLUMN_INVALID,
285 		},
286 		.checks = {
287 			rs_siso_allow,
288 			rs_ant_allow,
289 			rs_sgi_allow,
290 		},
291 	},
292 	[RS_COLUMN_SISO_ANT_B_SGI] = {
293 		.mode = RS_SISO,
294 		.ant = ANT_B,
295 		.sgi = true,
296 		.next_columns = {
297 			RS_COLUMN_SISO_ANT_A_SGI,
298 			RS_COLUMN_MIMO2_SGI,
299 			RS_COLUMN_SISO_ANT_B,
300 			RS_COLUMN_LEGACY_ANT_A,
301 			RS_COLUMN_LEGACY_ANT_B,
302 			RS_COLUMN_INVALID,
303 			RS_COLUMN_INVALID,
304 		},
305 		.checks = {
306 			rs_siso_allow,
307 			rs_ant_allow,
308 			rs_sgi_allow,
309 		},
310 	},
311 	[RS_COLUMN_MIMO2] = {
312 		.mode = RS_MIMO2,
313 		.ant = ANT_AB,
314 		.next_columns = {
315 			RS_COLUMN_SISO_ANT_A,
316 			RS_COLUMN_MIMO2_SGI,
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 		},
326 	},
327 	[RS_COLUMN_MIMO2_SGI] = {
328 		.mode = RS_MIMO2,
329 		.ant = ANT_AB,
330 		.sgi = true,
331 		.next_columns = {
332 			RS_COLUMN_SISO_ANT_A_SGI,
333 			RS_COLUMN_MIMO2,
334 			RS_COLUMN_LEGACY_ANT_A,
335 			RS_COLUMN_LEGACY_ANT_B,
336 			RS_COLUMN_INVALID,
337 			RS_COLUMN_INVALID,
338 			RS_COLUMN_INVALID,
339 		},
340 		.checks = {
341 			rs_mimo_allow,
342 			rs_sgi_allow,
343 		},
344 	},
345 };
346 
347 static inline u8 rs_extract_rate(u32 rate_n_flags)
348 {
349 	/* also works for HT because bits 7:6 are zero there */
350 	return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
351 }
352 
353 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
354 {
355 	int idx = 0;
356 
357 	if (rate_n_flags & RATE_MCS_HT_MSK) {
358 		idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
359 		idx += IWL_RATE_MCS_0_INDEX;
360 
361 		/* skip 9M not supported in HT*/
362 		if (idx >= IWL_RATE_9M_INDEX)
363 			idx += 1;
364 		if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
365 			return idx;
366 	} else if (rate_n_flags & RATE_MCS_VHT_MSK ||
367 		   rate_n_flags & RATE_MCS_HE_MSK) {
368 		idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
369 		idx += IWL_RATE_MCS_0_INDEX;
370 
371 		/* skip 9M not supported in VHT*/
372 		if (idx >= IWL_RATE_9M_INDEX)
373 			idx++;
374 		if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
375 			return idx;
376 		if ((rate_n_flags & RATE_MCS_HE_MSK) &&
377 		    (idx <= IWL_LAST_HE_RATE))
378 			return idx;
379 	} else {
380 		/* legacy rate format, search for match in table */
381 
382 		u8 legacy_rate = rs_extract_rate(rate_n_flags);
383 		for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
384 			if (iwl_rates[idx].plcp == legacy_rate)
385 				return idx;
386 	}
387 
388 	return IWL_RATE_INVALID;
389 }
390 
391 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
392 				  struct ieee80211_sta *sta,
393 				  struct iwl_lq_sta *lq_sta,
394 				  int tid, bool ndp);
395 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
396 			   struct ieee80211_sta *sta,
397 			   struct iwl_lq_sta *lq_sta,
398 			   const struct rs_rate *initial_rate);
399 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
400 
401 /**
402  * The following tables contain the expected throughput metrics for all rates
403  *
404  *	1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
405  *
406  * where invalid entries are zeros.
407  *
408  * CCK rates are only valid in legacy table and will only be used in G
409  * (2.4 GHz) band.
410  */
411 
412 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
413 	7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
414 };
415 
416 /* Expected TpT tables. 4 indexes:
417  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
418  */
419 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
420 	{0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
421 	{0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
422 	{0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
423 	{0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
424 };
425 
426 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
427 	{0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
428 	{0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
429 	{0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
430 	{0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
431 };
432 
433 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
434 	{0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
435 	{0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
436 	{0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
437 	{0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
438 };
439 
440 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
441 	{0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
442 	{0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
443 	{0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
444 	{0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
445 };
446 
447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
448 	{0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
449 	{0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
450 	{0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
451 	{0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
452 };
453 
454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
455 	{0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
456 	{0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
457 	{0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
458 	{0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
459 };
460 
461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
462 	{0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
463 	{0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
464 	{0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
465 	{0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
466 };
467 
468 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
469 	{0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
470 	{0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
471 	{0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
472 	{0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
473 };
474 
475 /* mbps, mcs */
476 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
477 	{  "1", "BPSK DSSS"},
478 	{  "2", "QPSK DSSS"},
479 	{"5.5", "BPSK CCK"},
480 	{ "11", "QPSK CCK"},
481 	{  "6", "BPSK 1/2"},
482 	{  "9", "BPSK 1/2"},
483 	{ "12", "QPSK 1/2"},
484 	{ "18", "QPSK 3/4"},
485 	{ "24", "16QAM 1/2"},
486 	{ "36", "16QAM 3/4"},
487 	{ "48", "64QAM 2/3"},
488 	{ "54", "64QAM 3/4"},
489 	{ "60", "64QAM 5/6"},
490 };
491 
492 #define MCS_INDEX_PER_STREAM	(8)
493 
494 static const char *rs_pretty_ant(u8 ant)
495 {
496 	static const char * const ant_name[] = {
497 		[ANT_NONE] = "None",
498 		[ANT_A]    = "A",
499 		[ANT_B]    = "B",
500 		[ANT_AB]   = "AB",
501 		[ANT_C]    = "C",
502 		[ANT_AC]   = "AC",
503 		[ANT_BC]   = "BC",
504 		[ANT_ABC]  = "ABC",
505 	};
506 
507 	if (ant > ANT_ABC)
508 		return "UNKNOWN";
509 
510 	return ant_name[ant];
511 }
512 
513 static const char *rs_pretty_lq_type(enum iwl_table_type type)
514 {
515 	static const char * const lq_types[] = {
516 		[LQ_NONE] = "NONE",
517 		[LQ_LEGACY_A] = "LEGACY_A",
518 		[LQ_LEGACY_G] = "LEGACY_G",
519 		[LQ_HT_SISO] = "HT SISO",
520 		[LQ_HT_MIMO2] = "HT MIMO",
521 		[LQ_VHT_SISO] = "VHT SISO",
522 		[LQ_VHT_MIMO2] = "VHT MIMO",
523 		[LQ_HE_SISO] = "HE SISO",
524 		[LQ_HE_MIMO2] = "HE MIMO",
525 	};
526 
527 	if (type < LQ_NONE || type >= LQ_MAX)
528 		return "UNKNOWN";
529 
530 	return lq_types[type];
531 }
532 
533 static char *rs_pretty_rate(const struct rs_rate *rate)
534 {
535 	static char buf[40];
536 	static const char * const legacy_rates[] = {
537 		[IWL_RATE_1M_INDEX] = "1M",
538 		[IWL_RATE_2M_INDEX] = "2M",
539 		[IWL_RATE_5M_INDEX] = "5.5M",
540 		[IWL_RATE_11M_INDEX] = "11M",
541 		[IWL_RATE_6M_INDEX] = "6M",
542 		[IWL_RATE_9M_INDEX] = "9M",
543 		[IWL_RATE_12M_INDEX] = "12M",
544 		[IWL_RATE_18M_INDEX] = "18M",
545 		[IWL_RATE_24M_INDEX] = "24M",
546 		[IWL_RATE_36M_INDEX] = "36M",
547 		[IWL_RATE_48M_INDEX] = "48M",
548 		[IWL_RATE_54M_INDEX] = "54M",
549 	};
550 	static const char *const ht_vht_rates[] = {
551 		[IWL_RATE_MCS_0_INDEX] = "MCS0",
552 		[IWL_RATE_MCS_1_INDEX] = "MCS1",
553 		[IWL_RATE_MCS_2_INDEX] = "MCS2",
554 		[IWL_RATE_MCS_3_INDEX] = "MCS3",
555 		[IWL_RATE_MCS_4_INDEX] = "MCS4",
556 		[IWL_RATE_MCS_5_INDEX] = "MCS5",
557 		[IWL_RATE_MCS_6_INDEX] = "MCS6",
558 		[IWL_RATE_MCS_7_INDEX] = "MCS7",
559 		[IWL_RATE_MCS_8_INDEX] = "MCS8",
560 		[IWL_RATE_MCS_9_INDEX] = "MCS9",
561 	};
562 	const char *rate_str;
563 
564 	if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
565 		rate_str = legacy_rates[rate->index];
566 	else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
567 		 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
568 		 (rate->index <= IWL_RATE_MCS_9_INDEX))
569 		rate_str = ht_vht_rates[rate->index];
570 	else
571 		rate_str = "BAD_RATE";
572 
573 	sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
574 		rs_pretty_ant(rate->ant), rate_str);
575 	return buf;
576 }
577 
578 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
579 				const char *prefix)
580 {
581 	IWL_DEBUG_RATE(mvm,
582 		       "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
583 		       prefix, rs_pretty_rate(rate), rate->bw,
584 		       rate->sgi, rate->ldpc, rate->stbc);
585 }
586 
587 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
588 {
589 	window->data = 0;
590 	window->success_counter = 0;
591 	window->success_ratio = IWL_INVALID_VALUE;
592 	window->counter = 0;
593 	window->average_tpt = IWL_INVALID_VALUE;
594 }
595 
596 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
597 					    struct iwl_scale_tbl_info *tbl)
598 {
599 	int i;
600 
601 	IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
602 	for (i = 0; i < IWL_RATE_COUNT; i++)
603 		rs_rate_scale_clear_window(&tbl->win[i]);
604 
605 	for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
606 		rs_rate_scale_clear_window(&tbl->tpc_win[i]);
607 }
608 
609 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
610 {
611 	return (ant_type & valid_antenna) == ant_type;
612 }
613 
614 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
615 				     struct iwl_lq_sta *lq_data, u8 tid,
616 				     struct ieee80211_sta *sta)
617 {
618 	int ret = -EAGAIN;
619 
620 	IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
621 		     sta->addr, tid);
622 
623 	/* start BA session until the peer sends del BA */
624 	ret = ieee80211_start_tx_ba_session(sta, tid, 0);
625 	if (ret == -EAGAIN) {
626 		/*
627 		 * driver and mac80211 is out of sync
628 		 * this might be cause by reloading firmware
629 		 * stop the tx ba session here
630 		 */
631 		IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
632 			tid);
633 		ieee80211_stop_tx_ba_session(sta, tid);
634 	}
635 	return ret;
636 }
637 
638 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
639 			      u8 tid, struct iwl_lq_sta *lq_sta,
640 			      struct ieee80211_sta *sta)
641 {
642 	struct iwl_mvm_tid_data *tid_data;
643 
644 	/*
645 	 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
646 	 * when the frame is not QoS
647 	 */
648 	if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
649 		IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
650 			tid, IWL_MAX_TID_COUNT);
651 		return;
652 	} else if (tid == IWL_MAX_TID_COUNT) {
653 		return;
654 	}
655 
656 	tid_data = &mvmsta->tid_data[tid];
657 	if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
658 	    tid_data->state == IWL_AGG_OFF &&
659 	    (lq_sta->tx_agg_tid_en & BIT(tid)) &&
660 	    tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
661 		IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
662 		if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
663 			tid_data->state = IWL_AGG_QUEUED;
664 	}
665 }
666 
667 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
668 {
669 	return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
670 	       !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
671 	       !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
672 }
673 
674 /*
675  * Static function to get the expected throughput from an iwl_scale_tbl_info
676  * that wraps a NULL pointer check
677  */
678 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
679 {
680 	if (tbl->expected_tpt)
681 		return tbl->expected_tpt[rs_index];
682 	return 0;
683 }
684 
685 /**
686  * rs_collect_tx_data - Update the success/failure sliding window
687  *
688  * We keep a sliding window of the last 62 packets transmitted
689  * at this rate.  window->data contains the bitmask of successful
690  * packets.
691  */
692 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
693 			       struct iwl_scale_tbl_info *tbl,
694 			       int scale_index, int attempts, int successes,
695 			       struct iwl_rate_scale_data *window)
696 {
697 	static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
698 	s32 fail_count, tpt;
699 
700 	/* Get expected throughput */
701 	tpt = get_expected_tpt(tbl, scale_index);
702 
703 	/*
704 	 * Keep track of only the latest 62 tx frame attempts in this rate's
705 	 * history window; anything older isn't really relevant any more.
706 	 * If we have filled up the sliding window, drop the oldest attempt;
707 	 * if the oldest attempt (highest bit in bitmap) shows "success",
708 	 * subtract "1" from the success counter (this is the main reason
709 	 * we keep these bitmaps!).
710 	 */
711 	while (attempts > 0) {
712 		if (window->counter >= IWL_RATE_MAX_WINDOW) {
713 			/* remove earliest */
714 			window->counter = IWL_RATE_MAX_WINDOW - 1;
715 
716 			if (window->data & mask) {
717 				window->data &= ~mask;
718 				window->success_counter--;
719 			}
720 		}
721 
722 		/* Increment frames-attempted counter */
723 		window->counter++;
724 
725 		/* Shift bitmap by one frame to throw away oldest history */
726 		window->data <<= 1;
727 
728 		/* Mark the most recent #successes attempts as successful */
729 		if (successes > 0) {
730 			window->success_counter++;
731 			window->data |= 0x1;
732 			successes--;
733 		}
734 
735 		attempts--;
736 	}
737 
738 	/* Calculate current success ratio, avoid divide-by-0! */
739 	if (window->counter > 0)
740 		window->success_ratio = 128 * (100 * window->success_counter)
741 					/ window->counter;
742 	else
743 		window->success_ratio = IWL_INVALID_VALUE;
744 
745 	fail_count = window->counter - window->success_counter;
746 
747 	/* Calculate average throughput, if we have enough history. */
748 	if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
749 	    (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
750 		window->average_tpt = (window->success_ratio * tpt + 64) / 128;
751 	else
752 		window->average_tpt = IWL_INVALID_VALUE;
753 
754 	return 0;
755 }
756 
757 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
758 			       struct iwl_lq_sta *lq_sta,
759 			       struct iwl_scale_tbl_info *tbl,
760 			       int scale_index, int attempts, int successes,
761 			       u8 reduced_txp)
762 {
763 	struct iwl_rate_scale_data *window = NULL;
764 
765 	if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
766 		return -EINVAL;
767 
768 	window = &tbl->tpc_win[reduced_txp];
769 	return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
770 				    window);
771 }
772 
773 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
774 				    struct iwl_mvm_sta *mvmsta,
775 				    u8 tid, int successes)
776 {
777 	struct iwl_mvm_tid_data *tid_data;
778 
779 	if (tid >= IWL_MAX_TID_COUNT)
780 		return;
781 
782 	tid_data = &mvmsta->tid_data[tid];
783 
784 	/*
785 	 * Measure if there're enough successful transmits per second.
786 	 * These statistics are used only to decide if we can start a
787 	 * BA session, so it should be updated only when A-MPDU is
788 	 * off.
789 	 */
790 	if (tid_data->state != IWL_AGG_OFF)
791 		return;
792 
793 	if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
794 	    (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
795 		tid_data->tx_count_last = tid_data->tx_count;
796 		tid_data->tx_count = 0;
797 		tid_data->tpt_meas_start = jiffies;
798 	} else {
799 		tid_data->tx_count += successes;
800 	}
801 }
802 
803 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
804 			       struct iwl_mvm_sta *mvmsta, u8 tid,
805 			       struct iwl_scale_tbl_info *tbl,
806 			       int scale_index, int attempts, int successes)
807 {
808 	struct iwl_rate_scale_data *window = NULL;
809 
810 	if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
811 		return -EINVAL;
812 
813 	if (tbl->column != RS_COLUMN_INVALID) {
814 		struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
815 
816 		pers->tx_stats[tbl->column][scale_index].total += attempts;
817 		pers->tx_stats[tbl->column][scale_index].success += successes;
818 	}
819 
820 	rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
821 
822 	/* Select window for current tx bit rate */
823 	window = &(tbl->win[scale_index]);
824 	return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
825 				   window);
826 }
827 
828 /* Convert rs_rate object into ucode rate bitmask */
829 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
830 				  struct rs_rate *rate)
831 {
832 	u32 ucode_rate = 0;
833 	int index = rate->index;
834 
835 	ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
836 			 RATE_MCS_ANT_ABC_MSK);
837 
838 	if (is_legacy(rate)) {
839 		ucode_rate |= iwl_rates[index].plcp;
840 		if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
841 			ucode_rate |= RATE_MCS_CCK_MSK;
842 		return ucode_rate;
843 	}
844 
845 	if (is_ht(rate)) {
846 		if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
847 			IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
848 			index = IWL_LAST_HT_RATE;
849 		}
850 		ucode_rate |= RATE_MCS_HT_MSK;
851 
852 		if (is_ht_siso(rate))
853 			ucode_rate |= iwl_rates[index].plcp_ht_siso;
854 		else if (is_ht_mimo2(rate))
855 			ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
856 		else
857 			WARN_ON_ONCE(1);
858 	} else if (is_vht(rate)) {
859 		if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
860 			IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
861 			index = IWL_LAST_VHT_RATE;
862 		}
863 		ucode_rate |= RATE_MCS_VHT_MSK;
864 		if (is_vht_siso(rate))
865 			ucode_rate |= iwl_rates[index].plcp_vht_siso;
866 		else if (is_vht_mimo2(rate))
867 			ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
868 		else
869 			WARN_ON_ONCE(1);
870 
871 	} else {
872 		IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
873 	}
874 
875 	if (is_siso(rate) && rate->stbc) {
876 		/* To enable STBC we need to set both a flag and ANT_AB */
877 		ucode_rate |= RATE_MCS_ANT_AB_MSK;
878 		ucode_rate |= RATE_MCS_STBC_MSK;
879 	}
880 
881 	ucode_rate |= rate->bw;
882 	if (rate->sgi)
883 		ucode_rate |= RATE_MCS_SGI_MSK;
884 	if (rate->ldpc)
885 		ucode_rate |= RATE_MCS_LDPC_MSK;
886 
887 	return ucode_rate;
888 }
889 
890 /* Convert a ucode rate into an rs_rate object */
891 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
892 				   enum nl80211_band band,
893 				   struct rs_rate *rate)
894 {
895 	u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
896 	u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
897 	u8 nss;
898 
899 	memset(rate, 0, sizeof(*rate));
900 	rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
901 
902 	if (rate->index == IWL_RATE_INVALID)
903 		return -EINVAL;
904 
905 	rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
906 
907 	/* Legacy */
908 	if (!(ucode_rate & RATE_MCS_HT_MSK) &&
909 	    !(ucode_rate & RATE_MCS_VHT_MSK) &&
910 	    !(ucode_rate & RATE_MCS_HE_MSK)) {
911 		if (num_of_ant == 1) {
912 			if (band == NL80211_BAND_5GHZ)
913 				rate->type = LQ_LEGACY_A;
914 			else
915 				rate->type = LQ_LEGACY_G;
916 		}
917 
918 		return 0;
919 	}
920 
921 	/* HT, VHT or HE */
922 	if (ucode_rate & RATE_MCS_SGI_MSK)
923 		rate->sgi = true;
924 	if (ucode_rate & RATE_MCS_LDPC_MSK)
925 		rate->ldpc = true;
926 	if (ucode_rate & RATE_MCS_STBC_MSK)
927 		rate->stbc = true;
928 	if (ucode_rate & RATE_MCS_BF_MSK)
929 		rate->bfer = true;
930 
931 	rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
932 
933 	if (ucode_rate & RATE_MCS_HT_MSK) {
934 		nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
935 		       RATE_HT_MCS_NSS_POS) + 1;
936 
937 		if (nss == 1) {
938 			rate->type = LQ_HT_SISO;
939 			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
940 				  "stbc %d bfer %d",
941 				  rate->stbc, rate->bfer);
942 		} else if (nss == 2) {
943 			rate->type = LQ_HT_MIMO2;
944 			WARN_ON_ONCE(num_of_ant != 2);
945 		} else {
946 			WARN_ON_ONCE(1);
947 		}
948 	} else if (ucode_rate & RATE_MCS_VHT_MSK) {
949 		nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
950 		       RATE_VHT_MCS_NSS_POS) + 1;
951 
952 		if (nss == 1) {
953 			rate->type = LQ_VHT_SISO;
954 			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
955 				  "stbc %d bfer %d",
956 				  rate->stbc, rate->bfer);
957 		} else if (nss == 2) {
958 			rate->type = LQ_VHT_MIMO2;
959 			WARN_ON_ONCE(num_of_ant != 2);
960 		} else {
961 			WARN_ON_ONCE(1);
962 		}
963 	} else if (ucode_rate & RATE_MCS_HE_MSK) {
964 		nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
965 		      RATE_VHT_MCS_NSS_POS) + 1;
966 
967 		if (nss == 1) {
968 			rate->type = LQ_HE_SISO;
969 			WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
970 				  "stbc %d bfer %d", rate->stbc, rate->bfer);
971 		} else if (nss == 2) {
972 			rate->type = LQ_HE_MIMO2;
973 			WARN_ON_ONCE(num_of_ant != 2);
974 		} else {
975 			WARN_ON_ONCE(1);
976 		}
977 	}
978 
979 	WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
980 		     !is_he(rate) && !is_vht(rate));
981 
982 	return 0;
983 }
984 
985 /* switch to another antenna/antennas and return 1 */
986 /* if no other valid antenna found, return 0 */
987 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
988 {
989 	u8 new_ant_type;
990 
991 	if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C))
992 		return 0;
993 
994 	if (!rs_is_valid_ant(valid_ant, rate->ant))
995 		return 0;
996 
997 	new_ant_type = ant_toggle_lookup[rate->ant];
998 
999 	while ((new_ant_type != rate->ant) &&
1000 	       !rs_is_valid_ant(valid_ant, new_ant_type))
1001 		new_ant_type = ant_toggle_lookup[new_ant_type];
1002 
1003 	if (new_ant_type == rate->ant)
1004 		return 0;
1005 
1006 	rate->ant = new_ant_type;
1007 
1008 	return 1;
1009 }
1010 
1011 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
1012 				  struct rs_rate *rate)
1013 {
1014 	if (is_legacy(rate))
1015 		return lq_sta->active_legacy_rate;
1016 	else if (is_siso(rate))
1017 		return lq_sta->active_siso_rate;
1018 	else if (is_mimo2(rate))
1019 		return lq_sta->active_mimo2_rate;
1020 
1021 	WARN_ON_ONCE(1);
1022 	return 0;
1023 }
1024 
1025 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1026 				int rate_type)
1027 {
1028 	u8 high = IWL_RATE_INVALID;
1029 	u8 low = IWL_RATE_INVALID;
1030 
1031 	/* 802.11A or ht walks to the next literal adjacent rate in
1032 	 * the rate table */
1033 	if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1034 		int i;
1035 		u32 mask;
1036 
1037 		/* Find the previous rate that is in the rate mask */
1038 		i = index - 1;
1039 		if (i >= 0)
1040 			mask = BIT(i);
1041 		for (; i >= 0; i--, mask >>= 1) {
1042 			if (rate_mask & mask) {
1043 				low = i;
1044 				break;
1045 			}
1046 		}
1047 
1048 		/* Find the next rate that is in the rate mask */
1049 		i = index + 1;
1050 		for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1051 			if (rate_mask & mask) {
1052 				high = i;
1053 				break;
1054 			}
1055 		}
1056 
1057 		return (high << 8) | low;
1058 	}
1059 
1060 	low = index;
1061 	while (low != IWL_RATE_INVALID) {
1062 		low = iwl_rates[low].prev_rs;
1063 		if (low == IWL_RATE_INVALID)
1064 			break;
1065 		if (rate_mask & (1 << low))
1066 			break;
1067 	}
1068 
1069 	high = index;
1070 	while (high != IWL_RATE_INVALID) {
1071 		high = iwl_rates[high].next_rs;
1072 		if (high == IWL_RATE_INVALID)
1073 			break;
1074 		if (rate_mask & (1 << high))
1075 			break;
1076 	}
1077 
1078 	return (high << 8) | low;
1079 }
1080 
1081 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1082 				     struct rs_rate *rate)
1083 {
1084 	return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1085 }
1086 
1087 /* Get the next supported lower rate in the current column.
1088  * Return true if bottom rate in the current column was reached
1089  */
1090 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1091 					struct rs_rate *rate)
1092 {
1093 	u8 low;
1094 	u16 high_low;
1095 	u16 rate_mask;
1096 	struct iwl_mvm *mvm = lq_sta->pers.drv;
1097 
1098 	rate_mask = rs_get_supported_rates(lq_sta, rate);
1099 	high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1100 					rate->type);
1101 	low = high_low & 0xff;
1102 
1103 	/* Bottom rate of column reached */
1104 	if (low == IWL_RATE_INVALID)
1105 		return true;
1106 
1107 	rate->index = low;
1108 	return false;
1109 }
1110 
1111 /* Get the next rate to use following a column downgrade */
1112 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1113 					  struct rs_rate *rate)
1114 {
1115 	struct iwl_mvm *mvm = lq_sta->pers.drv;
1116 
1117 	if (is_legacy(rate)) {
1118 		/* No column to downgrade from Legacy */
1119 		return;
1120 	} else if (is_siso(rate)) {
1121 		/* Downgrade to Legacy if we were in SISO */
1122 		if (lq_sta->band == NL80211_BAND_5GHZ)
1123 			rate->type = LQ_LEGACY_A;
1124 		else
1125 			rate->type = LQ_LEGACY_G;
1126 
1127 		rate->bw = RATE_MCS_CHAN_WIDTH_20;
1128 
1129 		WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1130 			     rate->index > IWL_RATE_MCS_9_INDEX);
1131 
1132 		rate->index = rs_ht_to_legacy[rate->index];
1133 		rate->ldpc = false;
1134 	} else {
1135 		/* Downgrade to SISO with same MCS if in MIMO  */
1136 		rate->type = is_vht_mimo2(rate) ?
1137 			LQ_VHT_SISO : LQ_HT_SISO;
1138 	}
1139 
1140 	if (num_of_ant(rate->ant) > 1)
1141 		rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1142 
1143 	/* Relevant in both switching to SISO or Legacy */
1144 	rate->sgi = false;
1145 
1146 	if (!rs_rate_supported(lq_sta, rate))
1147 		rs_get_lower_rate_in_column(lq_sta, rate);
1148 }
1149 
1150 /* Check if both rates share the same column */
1151 static inline bool rs_rate_column_match(struct rs_rate *a,
1152 					struct rs_rate *b)
1153 {
1154 	bool ant_match;
1155 
1156 	if (a->stbc || a->bfer)
1157 		ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1158 	else
1159 		ant_match = (a->ant == b->ant);
1160 
1161 	return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1162 		&& ant_match;
1163 }
1164 
1165 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1166 {
1167 	if (is_legacy(rate)) {
1168 		if (rate->ant == ANT_A)
1169 			return RS_COLUMN_LEGACY_ANT_A;
1170 
1171 		if (rate->ant == ANT_B)
1172 			return RS_COLUMN_LEGACY_ANT_B;
1173 
1174 		goto err;
1175 	}
1176 
1177 	if (is_siso(rate)) {
1178 		if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1179 			return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1180 				RS_COLUMN_SISO_ANT_A;
1181 
1182 		if (rate->ant == ANT_B)
1183 			return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1184 				RS_COLUMN_SISO_ANT_B;
1185 
1186 		goto err;
1187 	}
1188 
1189 	if (is_mimo(rate))
1190 		return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1191 
1192 err:
1193 	return RS_COLUMN_INVALID;
1194 }
1195 
1196 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1197 {
1198 	u8 tid = IWL_MAX_TID_COUNT;
1199 
1200 	if (ieee80211_is_data_qos(hdr->frame_control)) {
1201 		u8 *qc = ieee80211_get_qos_ctl(hdr);
1202 		tid = qc[0] & 0xf;
1203 	}
1204 
1205 	if (unlikely(tid > IWL_MAX_TID_COUNT))
1206 		tid = IWL_MAX_TID_COUNT;
1207 
1208 	return tid;
1209 }
1210 
1211 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1212 			  int tid, struct ieee80211_tx_info *info, bool ndp)
1213 {
1214 	int legacy_success;
1215 	int retries;
1216 	int i;
1217 	struct iwl_lq_cmd *table;
1218 	u32 lq_hwrate;
1219 	struct rs_rate lq_rate, tx_resp_rate;
1220 	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1221 	u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1222 	u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1223 	u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1224 	u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1225 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1226 	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
1227 
1228 	/* Treat uninitialized rate scaling data same as non-existing. */
1229 	if (!lq_sta) {
1230 		IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1231 		return;
1232 	} else if (!lq_sta->pers.drv) {
1233 		IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1234 		return;
1235 	}
1236 
1237 	/* This packet was aggregated but doesn't carry status info */
1238 	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1239 	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
1240 		return;
1241 
1242 	if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
1243 				    &tx_resp_rate)) {
1244 		WARN_ON_ONCE(1);
1245 		return;
1246 	}
1247 
1248 #ifdef CONFIG_MAC80211_DEBUGFS
1249 	/* Disable last tx check if we are debugging with fixed rate but
1250 	 * update tx stats */
1251 	if (lq_sta->pers.dbg_fixed_rate) {
1252 		int index = tx_resp_rate.index;
1253 		enum rs_column column;
1254 		int attempts, success;
1255 
1256 		column = rs_get_column_from_rate(&tx_resp_rate);
1257 		if (WARN_ONCE(column == RS_COLUMN_INVALID,
1258 			      "Can't map rate 0x%x to column",
1259 			      tx_resp_hwrate))
1260 			return;
1261 
1262 		if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1263 			attempts = info->status.ampdu_len;
1264 			success = info->status.ampdu_ack_len;
1265 		} else {
1266 			attempts = info->status.rates[0].count;
1267 			success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1268 		}
1269 
1270 		lq_sta->pers.tx_stats[column][index].total += attempts;
1271 		lq_sta->pers.tx_stats[column][index].success += success;
1272 
1273 		IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1274 			       tx_resp_hwrate, success, attempts);
1275 		return;
1276 	}
1277 #endif
1278 
1279 	if (time_after(jiffies,
1280 		       (unsigned long)(lq_sta->last_tx +
1281 				       (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1282 		IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1283 		iwl_mvm_rs_rate_init(mvm, sta, info->band, true);
1284 		return;
1285 	}
1286 	lq_sta->last_tx = jiffies;
1287 
1288 	/* Ignore this Tx frame response if its initial rate doesn't match
1289 	 * that of latest Link Quality command.  There may be stragglers
1290 	 * from a previous Link Quality command, but we're no longer interested
1291 	 * in those; they're either from the "active" mode while we're trying
1292 	 * to check "search" mode, or a prior "search" mode after we've moved
1293 	 * to a new "search" mode (which might become the new "active" mode).
1294 	 */
1295 	table = &lq_sta->lq;
1296 	lq_hwrate = le32_to_cpu(table->rs_table[0]);
1297 	if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
1298 		WARN_ON_ONCE(1);
1299 		return;
1300 	}
1301 
1302 	/* Here we actually compare this rate to the latest LQ command */
1303 	if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1304 		IWL_DEBUG_RATE(mvm,
1305 			       "tx resp color 0x%x does not match 0x%x\n",
1306 			       lq_color, LQ_FLAG_COLOR_GET(table->flags));
1307 
1308 		/*
1309 		 * Since rates mis-match, the last LQ command may have failed.
1310 		 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1311 		 * ... driver.
1312 		 */
1313 		lq_sta->missed_rate_counter++;
1314 		if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1315 			lq_sta->missed_rate_counter = 0;
1316 			IWL_DEBUG_RATE(mvm,
1317 				       "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1318 				       lq_sta->rs_state);
1319 			iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1320 		}
1321 		/* Regardless, ignore this status info for outdated rate */
1322 		return;
1323 	} else
1324 		/* Rate did match, so reset the missed_rate_counter */
1325 		lq_sta->missed_rate_counter = 0;
1326 
1327 	if (!lq_sta->search_better_tbl) {
1328 		curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1329 		other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1330 	} else {
1331 		curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1332 		other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1333 	}
1334 
1335 	if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1336 		IWL_DEBUG_RATE(mvm,
1337 			       "Neither active nor search matches tx rate\n");
1338 		tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1339 		rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1340 		tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1341 		rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1342 		rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1343 
1344 		/*
1345 		 * no matching table found, let's by-pass the data collection
1346 		 * and continue to perform rate scale to find the rate table
1347 		 */
1348 		rs_stay_in_table(lq_sta, true);
1349 		goto done;
1350 	}
1351 
1352 	/*
1353 	 * Updating the frame history depends on whether packets were
1354 	 * aggregated.
1355 	 *
1356 	 * For aggregation, all packets were transmitted at the same rate, the
1357 	 * first index into rate scale table.
1358 	 */
1359 	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1360 		rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1361 				    info->status.ampdu_len,
1362 				    info->status.ampdu_ack_len,
1363 				    reduced_txp);
1364 
1365 		/* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1366 		 * it as a single frame loss as we don't want the success ratio
1367 		 * to dip too quickly because a BA wasn't received.
1368 		 * For TPC, there's no need for this optimisation since we want
1369 		 * to recover very quickly from a bad power reduction and,
1370 		 * therefore we'd like the success ratio to get an immediate hit
1371 		 * when failing to get a BA, so we'd switch back to a lower or
1372 		 * zero power reduction. When FW transmits agg with a rate
1373 		 * different from the initial rate, it will not use reduced txp
1374 		 * and will send BA notification twice (one empty with reduced
1375 		 * txp equal to the value from LQ and one with reduced txp 0).
1376 		 * We need to update counters for each txp level accordingly.
1377 		 */
1378 		if (info->status.ampdu_ack_len == 0)
1379 			info->status.ampdu_len = 1;
1380 
1381 		rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index,
1382 				    info->status.ampdu_len,
1383 				    info->status.ampdu_ack_len);
1384 
1385 		/* Update success/fail counts if not searching for new mode */
1386 		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1387 			lq_sta->total_success += info->status.ampdu_ack_len;
1388 			lq_sta->total_failed += (info->status.ampdu_len -
1389 					info->status.ampdu_ack_len);
1390 		}
1391 	} else {
1392 		/* For legacy, update frame history with for each Tx retry. */
1393 		retries = info->status.rates[0].count - 1;
1394 		/* HW doesn't send more than 15 retries */
1395 		retries = min(retries, 15);
1396 
1397 		/* The last transmission may have been successful */
1398 		legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1399 		/* Collect data for each rate used during failed TX attempts */
1400 		for (i = 0; i <= retries; ++i) {
1401 			lq_hwrate = le32_to_cpu(table->rs_table[i]);
1402 			if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
1403 						    &lq_rate)) {
1404 				WARN_ON_ONCE(1);
1405 				return;
1406 			}
1407 
1408 			/*
1409 			 * Only collect stats if retried rate is in the same RS
1410 			 * table as active/search.
1411 			 */
1412 			if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1413 				tmp_tbl = curr_tbl;
1414 			else if (rs_rate_column_match(&lq_rate,
1415 						      &other_tbl->rate))
1416 				tmp_tbl = other_tbl;
1417 			else
1418 				continue;
1419 
1420 			rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1421 					    tx_resp_rate.index, 1,
1422 					    i < retries ? 0 : legacy_success,
1423 					    reduced_txp);
1424 			rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
1425 					    tx_resp_rate.index, 1,
1426 					    i < retries ? 0 : legacy_success);
1427 		}
1428 
1429 		/* Update success/fail counts if not searching for new mode */
1430 		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1431 			lq_sta->total_success += legacy_success;
1432 			lq_sta->total_failed += retries + (1 - legacy_success);
1433 		}
1434 	}
1435 	/* The last TX rate is cached in lq_sta; it's set in if/else above */
1436 	lq_sta->last_rate_n_flags = lq_hwrate;
1437 	IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1438 done:
1439 	/* See if there's a better rate or modulation mode to try. */
1440 	if (sta->supp_rates[info->band])
1441 		rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1442 }
1443 
1444 /*
1445  * mac80211 sends us Tx status
1446  */
1447 static void rs_drv_mac80211_tx_status(void *mvm_r,
1448 				      struct ieee80211_supported_band *sband,
1449 				      struct ieee80211_sta *sta, void *priv_sta,
1450 				      struct sk_buff *skb)
1451 {
1452 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1453 	struct iwl_op_mode *op_mode = mvm_r;
1454 	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1455 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1456 
1457 	if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1458 		return;
1459 
1460 	if (!ieee80211_is_data(hdr->frame_control) ||
1461 	    info->flags & IEEE80211_TX_CTL_NO_ACK)
1462 		return;
1463 
1464 	iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1465 			     ieee80211_is_qos_nullfunc(hdr->frame_control));
1466 }
1467 
1468 /*
1469  * Begin a period of staying with a selected modulation mode.
1470  * Set "stay_in_tbl" flag to prevent any mode switches.
1471  * Set frame tx success limits according to legacy vs. high-throughput,
1472  * and reset overall (spanning all rates) tx success history statistics.
1473  * These control how long we stay using same modulation mode before
1474  * searching for a new mode.
1475  */
1476 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1477 				 struct iwl_lq_sta *lq_sta)
1478 {
1479 	IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1480 	lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1481 	if (is_legacy) {
1482 		lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1483 		lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1484 		lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1485 	} else {
1486 		lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1487 		lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1488 		lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1489 	}
1490 	lq_sta->table_count = 0;
1491 	lq_sta->total_failed = 0;
1492 	lq_sta->total_success = 0;
1493 	lq_sta->flush_timer = jiffies;
1494 	lq_sta->visited_columns = 0;
1495 }
1496 
1497 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1498 {
1499 	if (rate_mask)
1500 		return find_last_bit(&rate_mask, BITS_PER_LONG);
1501 	return IWL_RATE_INVALID;
1502 }
1503 
1504 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1505 				   const struct rs_tx_column *column)
1506 {
1507 	switch (column->mode) {
1508 	case RS_LEGACY:
1509 		return lq_sta->max_legacy_rate_idx;
1510 	case RS_SISO:
1511 		return lq_sta->max_siso_rate_idx;
1512 	case RS_MIMO2:
1513 		return lq_sta->max_mimo2_rate_idx;
1514 	default:
1515 		WARN_ON_ONCE(1);
1516 	}
1517 
1518 	return lq_sta->max_legacy_rate_idx;
1519 }
1520 
1521 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1522 					    const struct rs_tx_column *column,
1523 					    u32 bw)
1524 {
1525 	/* Used to choose among HT tables */
1526 	const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1527 
1528 	if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1529 			 column->mode != RS_SISO &&
1530 			 column->mode != RS_MIMO2))
1531 		return expected_tpt_legacy;
1532 
1533 	/* Legacy rates have only one table */
1534 	if (column->mode == RS_LEGACY)
1535 		return expected_tpt_legacy;
1536 
1537 	ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1538 	/* Choose among many HT tables depending on number of streams
1539 	 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1540 	 * status */
1541 	if (column->mode == RS_SISO) {
1542 		switch (bw) {
1543 		case RATE_MCS_CHAN_WIDTH_20:
1544 			ht_tbl_pointer = expected_tpt_siso_20MHz;
1545 			break;
1546 		case RATE_MCS_CHAN_WIDTH_40:
1547 			ht_tbl_pointer = expected_tpt_siso_40MHz;
1548 			break;
1549 		case RATE_MCS_CHAN_WIDTH_80:
1550 			ht_tbl_pointer = expected_tpt_siso_80MHz;
1551 			break;
1552 		case RATE_MCS_CHAN_WIDTH_160:
1553 			ht_tbl_pointer = expected_tpt_siso_160MHz;
1554 			break;
1555 		default:
1556 			WARN_ON_ONCE(1);
1557 		}
1558 	} else if (column->mode == RS_MIMO2) {
1559 		switch (bw) {
1560 		case RATE_MCS_CHAN_WIDTH_20:
1561 			ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1562 			break;
1563 		case RATE_MCS_CHAN_WIDTH_40:
1564 			ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1565 			break;
1566 		case RATE_MCS_CHAN_WIDTH_80:
1567 			ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1568 			break;
1569 		case RATE_MCS_CHAN_WIDTH_160:
1570 			ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1571 			break;
1572 		default:
1573 			WARN_ON_ONCE(1);
1574 		}
1575 	} else {
1576 		WARN_ON_ONCE(1);
1577 	}
1578 
1579 	if (!column->sgi && !lq_sta->is_agg)		/* Normal */
1580 		return ht_tbl_pointer[0];
1581 	else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1582 		return ht_tbl_pointer[1];
1583 	else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1584 		return ht_tbl_pointer[2];
1585 	else						/* AGG+SGI */
1586 		return ht_tbl_pointer[3];
1587 }
1588 
1589 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1590 				      struct iwl_scale_tbl_info *tbl)
1591 {
1592 	struct rs_rate *rate = &tbl->rate;
1593 	const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1594 
1595 	tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1596 }
1597 
1598 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1599 			    struct iwl_lq_sta *lq_sta,
1600 			    struct iwl_scale_tbl_info *tbl,	/* "search" */
1601 			    unsigned long rate_mask, s8 index)
1602 {
1603 	struct iwl_scale_tbl_info *active_tbl =
1604 	    &(lq_sta->lq_info[lq_sta->active_tbl]);
1605 	s32 success_ratio = active_tbl->win[index].success_ratio;
1606 	u16 expected_current_tpt = active_tbl->expected_tpt[index];
1607 	const u16 *tpt_tbl = tbl->expected_tpt;
1608 	u16 high_low;
1609 	u32 target_tpt;
1610 	int rate_idx;
1611 
1612 	if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1613 		target_tpt = 100 * expected_current_tpt;
1614 		IWL_DEBUG_RATE(mvm,
1615 			       "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1616 			       success_ratio, target_tpt);
1617 	} else {
1618 		target_tpt = lq_sta->last_tpt;
1619 		IWL_DEBUG_RATE(mvm,
1620 			       "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1621 			       success_ratio, target_tpt);
1622 	}
1623 
1624 	rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1625 
1626 	while (rate_idx != IWL_RATE_INVALID) {
1627 		if (target_tpt < (100 * tpt_tbl[rate_idx]))
1628 			break;
1629 
1630 		high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1631 						tbl->rate.type);
1632 
1633 		rate_idx = (high_low >> 8) & 0xff;
1634 	}
1635 
1636 	IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1637 		       rate_idx, target_tpt,
1638 		       rate_idx != IWL_RATE_INVALID ?
1639 		       100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1640 
1641 	return rate_idx;
1642 }
1643 
1644 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1645 {
1646 	struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap;
1647 	struct ieee80211_vht_cap vht_cap = {
1648 		.vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1649 		.supp_mcs = sta_vht_cap->vht_mcs,
1650 	};
1651 
1652 	switch (sta->bandwidth) {
1653 	case IEEE80211_STA_RX_BW_160:
1654 		/*
1655 		 * Don't use 160 MHz if VHT extended NSS support
1656 		 * says we cannot use 2 streams, we don't want to
1657 		 * deal with this.
1658 		 * We only check MCS 0 - they will support that if
1659 		 * we got here at all and we don't care which MCS,
1660 		 * we want to determine a more global state.
1661 		 */
1662 		if (ieee80211_get_vht_max_nss(&vht_cap,
1663 					      IEEE80211_VHT_CHANWIDTH_160MHZ,
1664 					      0, true) < sta->rx_nss)
1665 			return RATE_MCS_CHAN_WIDTH_80;
1666 		return RATE_MCS_CHAN_WIDTH_160;
1667 	case IEEE80211_STA_RX_BW_80:
1668 		return RATE_MCS_CHAN_WIDTH_80;
1669 	case IEEE80211_STA_RX_BW_40:
1670 		return RATE_MCS_CHAN_WIDTH_40;
1671 	case IEEE80211_STA_RX_BW_20:
1672 	default:
1673 		return RATE_MCS_CHAN_WIDTH_20;
1674 	}
1675 }
1676 
1677 /*
1678  * Check whether we should continue using same modulation mode, or
1679  * begin search for a new mode, based on:
1680  * 1) # tx successes or failures while using this mode
1681  * 2) # times calling this function
1682  * 3) elapsed time in this mode (not used, for now)
1683  */
1684 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1685 {
1686 	struct iwl_scale_tbl_info *tbl;
1687 	int active_tbl;
1688 	int flush_interval_passed = 0;
1689 	struct iwl_mvm *mvm;
1690 
1691 	mvm = lq_sta->pers.drv;
1692 	active_tbl = lq_sta->active_tbl;
1693 
1694 	tbl = &(lq_sta->lq_info[active_tbl]);
1695 
1696 	/* If we've been disallowing search, see if we should now allow it */
1697 	if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1698 		/* Elapsed time using current modulation mode */
1699 		if (lq_sta->flush_timer)
1700 			flush_interval_passed =
1701 				time_after(jiffies,
1702 					   (unsigned long)(lq_sta->flush_timer +
1703 							   (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1704 
1705 		/*
1706 		 * Check if we should allow search for new modulation mode.
1707 		 * If many frames have failed or succeeded, or we've used
1708 		 * this same modulation for a long time, allow search, and
1709 		 * reset history stats that keep track of whether we should
1710 		 * allow a new search.  Also (below) reset all bitmaps and
1711 		 * stats in active history.
1712 		 */
1713 		if (force_search ||
1714 		    (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1715 		    (lq_sta->total_success > lq_sta->max_success_limit) ||
1716 		    ((!lq_sta->search_better_tbl) &&
1717 		     (lq_sta->flush_timer) && (flush_interval_passed))) {
1718 			IWL_DEBUG_RATE(mvm,
1719 				       "LQ: stay is expired %d %d %d\n",
1720 				     lq_sta->total_failed,
1721 				     lq_sta->total_success,
1722 				     flush_interval_passed);
1723 
1724 			/* Allow search for new mode */
1725 			lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1726 			IWL_DEBUG_RATE(mvm,
1727 				       "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1728 			lq_sta->total_failed = 0;
1729 			lq_sta->total_success = 0;
1730 			lq_sta->flush_timer = 0;
1731 			/* mark the current column as visited */
1732 			lq_sta->visited_columns = BIT(tbl->column);
1733 		/*
1734 		 * Else if we've used this modulation mode enough repetitions
1735 		 * (regardless of elapsed time or success/failure), reset
1736 		 * history bitmaps and rate-specific stats for all rates in
1737 		 * active table.
1738 		 */
1739 		} else {
1740 			lq_sta->table_count++;
1741 			if (lq_sta->table_count >=
1742 			    lq_sta->table_count_limit) {
1743 				lq_sta->table_count = 0;
1744 
1745 				IWL_DEBUG_RATE(mvm,
1746 					       "LQ: stay in table clear win\n");
1747 				rs_rate_scale_clear_tbl_windows(mvm, tbl);
1748 			}
1749 		}
1750 
1751 		/* If transitioning to allow "search", reset all history
1752 		 * bitmaps and stats in active table (this will become the new
1753 		 * "search" table). */
1754 		if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1755 			rs_rate_scale_clear_tbl_windows(mvm, tbl);
1756 		}
1757 	}
1758 }
1759 
1760 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1761 			     struct iwl_scale_tbl_info *tbl,
1762 			     enum rs_action scale_action)
1763 {
1764 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1765 	int i;
1766 
1767 	/*
1768 	 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1769 	 * or 0, since there is no per-TID alg.
1770 	 */
1771 	if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1772 	    tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1773 	    scale_action == RS_ACTION_DOWNSCALE)
1774 		mvmsta->amsdu_enabled = 0;
1775 	else
1776 		mvmsta->amsdu_enabled = 0xFFFF;
1777 
1778 	if (mvmsta->vif->bss_conf.he_support &&
1779 	    !iwlwifi_mod_params.disable_11ax)
1780 		mvmsta->max_amsdu_len = sta->max_amsdu_len;
1781 	else
1782 		mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1783 
1784 	sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1785 
1786 	for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1787 		if (mvmsta->amsdu_enabled)
1788 			sta->max_tid_amsdu_len[i] =
1789 				iwl_mvm_max_amsdu_size(mvm, sta, i);
1790 		else
1791 			/*
1792 			 * Not so elegant, but this will effectively
1793 			 * prevent AMSDU on this TID
1794 			 */
1795 			sta->max_tid_amsdu_len[i] = 1;
1796 	}
1797 }
1798 
1799 /*
1800  * setup rate table in uCode
1801  */
1802 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1803 			       struct ieee80211_sta *sta,
1804 			       struct iwl_lq_sta *lq_sta,
1805 			       struct iwl_scale_tbl_info *tbl)
1806 {
1807 	rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1808 	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1809 }
1810 
1811 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1812 			      struct ieee80211_sta *sta,
1813 			      struct iwl_lq_sta *lq_sta,
1814 			      struct iwl_scale_tbl_info *tbl,
1815 			      enum rs_action scale_action)
1816 {
1817 	if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1818 		return false;
1819 
1820 	if (!is_vht_siso(&tbl->rate))
1821 		return false;
1822 
1823 	if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1824 	    (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1825 	    (scale_action == RS_ACTION_DOWNSCALE)) {
1826 		tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1827 		tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1828 		IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1829 		goto tweaked;
1830 	}
1831 
1832 	/* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1833 	 * sustainable, i.e. we're past the test window. We can't go back
1834 	 * if MCS5 is just tested as this will happen always after switching
1835 	 * to 20Mhz MCS4 because the rate stats are cleared.
1836 	 */
1837 	if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1838 	    (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1839 	     (scale_action == RS_ACTION_STAY)) ||
1840 	     ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1841 	      (scale_action == RS_ACTION_UPSCALE)))) {
1842 		tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1843 		tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1844 		IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1845 		goto tweaked;
1846 	}
1847 
1848 	return false;
1849 
1850 tweaked:
1851 	rs_set_expected_tpt_table(lq_sta, tbl);
1852 	rs_rate_scale_clear_tbl_windows(mvm, tbl);
1853 	return true;
1854 }
1855 
1856 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1857 					 struct iwl_lq_sta *lq_sta,
1858 					 struct ieee80211_sta *sta,
1859 					 struct iwl_scale_tbl_info *tbl)
1860 {
1861 	int i, j, max_rate;
1862 	enum rs_column next_col_id;
1863 	const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1864 	const struct rs_tx_column *next_col;
1865 	allow_column_func_t allow_func;
1866 	u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1867 	const u16 *expected_tpt_tbl;
1868 	u16 tpt, max_expected_tpt;
1869 
1870 	for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1871 		next_col_id = curr_col->next_columns[i];
1872 
1873 		if (next_col_id == RS_COLUMN_INVALID)
1874 			continue;
1875 
1876 		if (lq_sta->visited_columns & BIT(next_col_id)) {
1877 			IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1878 				       next_col_id);
1879 			continue;
1880 		}
1881 
1882 		next_col = &rs_tx_columns[next_col_id];
1883 
1884 		if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1885 			IWL_DEBUG_RATE(mvm,
1886 				       "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1887 				       next_col_id, valid_ants, next_col->ant);
1888 			continue;
1889 		}
1890 
1891 		for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1892 			allow_func = next_col->checks[j];
1893 			if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1894 						      next_col))
1895 				break;
1896 		}
1897 
1898 		if (j != MAX_COLUMN_CHECKS) {
1899 			IWL_DEBUG_RATE(mvm,
1900 				       "Skip column %d: not allowed (check %d failed)\n",
1901 				       next_col_id, j);
1902 
1903 			continue;
1904 		}
1905 
1906 		tpt = lq_sta->last_tpt / 100;
1907 		expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1908 						     rs_bw_from_sta_bw(sta));
1909 		if (WARN_ON_ONCE(!expected_tpt_tbl))
1910 			continue;
1911 
1912 		max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1913 		if (max_rate == IWL_RATE_INVALID) {
1914 			IWL_DEBUG_RATE(mvm,
1915 				       "Skip column %d: no rate is allowed in this column\n",
1916 				       next_col_id);
1917 			continue;
1918 		}
1919 
1920 		max_expected_tpt = expected_tpt_tbl[max_rate];
1921 		if (tpt >= max_expected_tpt) {
1922 			IWL_DEBUG_RATE(mvm,
1923 				       "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1924 				       next_col_id, max_expected_tpt, tpt);
1925 			continue;
1926 		}
1927 
1928 		IWL_DEBUG_RATE(mvm,
1929 			       "Found potential column %d. Max expected %d current %d\n",
1930 			       next_col_id, max_expected_tpt, tpt);
1931 		break;
1932 	}
1933 
1934 	if (i == MAX_NEXT_COLUMNS)
1935 		return RS_COLUMN_INVALID;
1936 
1937 	return next_col_id;
1938 }
1939 
1940 static int rs_switch_to_column(struct iwl_mvm *mvm,
1941 			       struct iwl_lq_sta *lq_sta,
1942 			       struct ieee80211_sta *sta,
1943 			       enum rs_column col_id)
1944 {
1945 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1946 	struct iwl_scale_tbl_info *search_tbl =
1947 				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1948 	struct rs_rate *rate = &search_tbl->rate;
1949 	const struct rs_tx_column *column = &rs_tx_columns[col_id];
1950 	const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1951 	unsigned long rate_mask = 0;
1952 	u32 rate_idx = 0;
1953 
1954 	memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1955 
1956 	rate->sgi = column->sgi;
1957 	rate->ant = column->ant;
1958 
1959 	if (column->mode == RS_LEGACY) {
1960 		if (lq_sta->band == NL80211_BAND_5GHZ)
1961 			rate->type = LQ_LEGACY_A;
1962 		else
1963 			rate->type = LQ_LEGACY_G;
1964 
1965 		rate->bw = RATE_MCS_CHAN_WIDTH_20;
1966 		rate->ldpc = false;
1967 		rate_mask = lq_sta->active_legacy_rate;
1968 	} else if (column->mode == RS_SISO) {
1969 		rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1970 		rate_mask = lq_sta->active_siso_rate;
1971 	} else if (column->mode == RS_MIMO2) {
1972 		rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1973 		rate_mask = lq_sta->active_mimo2_rate;
1974 	} else {
1975 		WARN_ONCE(1, "Bad column mode");
1976 	}
1977 
1978 	if (column->mode != RS_LEGACY) {
1979 		rate->bw = rs_bw_from_sta_bw(sta);
1980 		rate->ldpc = lq_sta->ldpc;
1981 	}
1982 
1983 	search_tbl->column = col_id;
1984 	rs_set_expected_tpt_table(lq_sta, search_tbl);
1985 
1986 	lq_sta->visited_columns |= BIT(col_id);
1987 
1988 	/* Get the best matching rate if we're changing modes. e.g.
1989 	 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1990 	 */
1991 	if (curr_column->mode != column->mode) {
1992 		rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1993 					    rate_mask, rate->index);
1994 
1995 		if ((rate_idx == IWL_RATE_INVALID) ||
1996 		    !(BIT(rate_idx) & rate_mask)) {
1997 			IWL_DEBUG_RATE(mvm,
1998 				       "can not switch with index %d"
1999 				       " rate mask %lx\n",
2000 				       rate_idx, rate_mask);
2001 
2002 			goto err;
2003 		}
2004 
2005 		rate->index = rate_idx;
2006 	}
2007 
2008 	IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
2009 		       col_id, rate->index);
2010 
2011 	return 0;
2012 
2013 err:
2014 	rate->type = LQ_NONE;
2015 	return -1;
2016 }
2017 
2018 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
2019 					 struct iwl_scale_tbl_info *tbl,
2020 					 s32 sr, int low, int high,
2021 					 int current_tpt,
2022 					 int low_tpt, int high_tpt)
2023 {
2024 	enum rs_action action = RS_ACTION_STAY;
2025 
2026 	if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
2027 	    (current_tpt == 0)) {
2028 		IWL_DEBUG_RATE(mvm,
2029 			       "Decrease rate because of low SR\n");
2030 		return RS_ACTION_DOWNSCALE;
2031 	}
2032 
2033 	if ((low_tpt == IWL_INVALID_VALUE) &&
2034 	    (high_tpt == IWL_INVALID_VALUE) &&
2035 	    (high != IWL_RATE_INVALID)) {
2036 		IWL_DEBUG_RATE(mvm,
2037 			       "No data about high/low rates. Increase rate\n");
2038 		return RS_ACTION_UPSCALE;
2039 	}
2040 
2041 	if ((high_tpt == IWL_INVALID_VALUE) &&
2042 	    (high != IWL_RATE_INVALID) &&
2043 	    (low_tpt != IWL_INVALID_VALUE) &&
2044 	    (low_tpt < current_tpt)) {
2045 		IWL_DEBUG_RATE(mvm,
2046 			       "No data about high rate and low rate is worse. Increase rate\n");
2047 		return RS_ACTION_UPSCALE;
2048 	}
2049 
2050 	if ((high_tpt != IWL_INVALID_VALUE) &&
2051 	    (high_tpt > current_tpt)) {
2052 		IWL_DEBUG_RATE(mvm,
2053 			       "Higher rate is better. Increate rate\n");
2054 		return RS_ACTION_UPSCALE;
2055 	}
2056 
2057 	if ((low_tpt != IWL_INVALID_VALUE) &&
2058 	    (high_tpt != IWL_INVALID_VALUE) &&
2059 	    (low_tpt < current_tpt) &&
2060 	    (high_tpt < current_tpt)) {
2061 		IWL_DEBUG_RATE(mvm,
2062 			       "Both high and low are worse. Maintain rate\n");
2063 		return RS_ACTION_STAY;
2064 	}
2065 
2066 	if ((low_tpt != IWL_INVALID_VALUE) &&
2067 	    (low_tpt > current_tpt)) {
2068 		IWL_DEBUG_RATE(mvm,
2069 			       "Lower rate is better\n");
2070 		action = RS_ACTION_DOWNSCALE;
2071 		goto out;
2072 	}
2073 
2074 	if ((low_tpt == IWL_INVALID_VALUE) &&
2075 	    (low != IWL_RATE_INVALID)) {
2076 		IWL_DEBUG_RATE(mvm,
2077 			       "No data about lower rate\n");
2078 		action = RS_ACTION_DOWNSCALE;
2079 		goto out;
2080 	}
2081 
2082 	IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2083 
2084 out:
2085 	if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2086 		if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2087 			IWL_DEBUG_RATE(mvm,
2088 				       "SR is above NO DECREASE. Avoid downscale\n");
2089 			action = RS_ACTION_STAY;
2090 		} else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2091 			IWL_DEBUG_RATE(mvm,
2092 				       "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2093 			action = RS_ACTION_STAY;
2094 		} else {
2095 			IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2096 		}
2097 	}
2098 
2099 	return action;
2100 }
2101 
2102 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2103 			  struct iwl_lq_sta *lq_sta)
2104 {
2105 	/* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2106 	 * supports STBC of at least 1*SS
2107 	 */
2108 	if (!lq_sta->stbc_capable)
2109 		return false;
2110 
2111 	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2112 		return false;
2113 
2114 	return true;
2115 }
2116 
2117 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2118 				int *weaker, int *stronger)
2119 {
2120 	*weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2121 	if (*weaker > TPC_MAX_REDUCTION)
2122 		*weaker = TPC_INVALID;
2123 
2124 	*stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2125 	if (*stronger < 0)
2126 		*stronger = TPC_INVALID;
2127 }
2128 
2129 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2130 			   struct rs_rate *rate, enum nl80211_band band)
2131 {
2132 	int index = rate->index;
2133 	bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2134 	bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2135 				!vif->bss_conf.ps);
2136 
2137 	IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2138 		       cam, sta_ps_disabled);
2139 	/*
2140 	 * allow tpc only if power management is enabled, or bt coex
2141 	 * activity grade allows it and we are on 2.4Ghz.
2142 	 */
2143 	if ((cam || sta_ps_disabled) &&
2144 	    !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2145 		return false;
2146 
2147 	IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2148 	if (is_legacy(rate))
2149 		return index == IWL_RATE_54M_INDEX;
2150 	if (is_ht(rate))
2151 		return index == IWL_RATE_MCS_7_INDEX;
2152 	if (is_vht(rate))
2153 		return index == IWL_RATE_MCS_7_INDEX ||
2154 		       index == IWL_RATE_MCS_8_INDEX ||
2155 		       index == IWL_RATE_MCS_9_INDEX;
2156 
2157 	WARN_ON_ONCE(1);
2158 	return false;
2159 }
2160 
2161 enum tpc_action {
2162 	TPC_ACTION_STAY,
2163 	TPC_ACTION_DECREASE,
2164 	TPC_ACTION_INCREASE,
2165 	TPC_ACTION_NO_RESTIRCTION,
2166 };
2167 
2168 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2169 					 s32 sr, int weak, int strong,
2170 					 int current_tpt,
2171 					 int weak_tpt, int strong_tpt)
2172 {
2173 	/* stay until we have valid tpt */
2174 	if (current_tpt == IWL_INVALID_VALUE) {
2175 		IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2176 		return TPC_ACTION_STAY;
2177 	}
2178 
2179 	/* Too many failures, increase txp */
2180 	if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2181 	    current_tpt == 0) {
2182 		IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2183 		return TPC_ACTION_NO_RESTIRCTION;
2184 	}
2185 
2186 	/* try decreasing first if applicable */
2187 	if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2188 	    weak != TPC_INVALID) {
2189 		if (weak_tpt == IWL_INVALID_VALUE &&
2190 		    (strong_tpt == IWL_INVALID_VALUE ||
2191 		     current_tpt >= strong_tpt)) {
2192 			IWL_DEBUG_RATE(mvm,
2193 				       "no weak txp measurement. decrease txp\n");
2194 			return TPC_ACTION_DECREASE;
2195 		}
2196 
2197 		if (weak_tpt > current_tpt) {
2198 			IWL_DEBUG_RATE(mvm,
2199 				       "lower txp has better tpt. decrease txp\n");
2200 			return TPC_ACTION_DECREASE;
2201 		}
2202 	}
2203 
2204 	/* next, increase if needed */
2205 	if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2206 	    strong != TPC_INVALID) {
2207 		if (weak_tpt == IWL_INVALID_VALUE &&
2208 		    strong_tpt != IWL_INVALID_VALUE &&
2209 		    current_tpt < strong_tpt) {
2210 			IWL_DEBUG_RATE(mvm,
2211 				       "higher txp has better tpt. increase txp\n");
2212 			return TPC_ACTION_INCREASE;
2213 		}
2214 
2215 		if (weak_tpt < current_tpt &&
2216 		    (strong_tpt == IWL_INVALID_VALUE ||
2217 		     strong_tpt > current_tpt)) {
2218 			IWL_DEBUG_RATE(mvm,
2219 				       "lower txp has worse tpt. increase txp\n");
2220 			return TPC_ACTION_INCREASE;
2221 		}
2222 	}
2223 
2224 	IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2225 	return TPC_ACTION_STAY;
2226 }
2227 
2228 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2229 			   struct ieee80211_sta *sta,
2230 			   struct iwl_lq_sta *lq_sta,
2231 			   struct iwl_scale_tbl_info *tbl)
2232 {
2233 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2234 	struct ieee80211_vif *vif = mvm_sta->vif;
2235 	struct ieee80211_chanctx_conf *chanctx_conf;
2236 	enum nl80211_band band;
2237 	struct iwl_rate_scale_data *window;
2238 	struct rs_rate *rate = &tbl->rate;
2239 	enum tpc_action action;
2240 	s32 sr;
2241 	u8 cur = lq_sta->lq.reduced_tpc;
2242 	int current_tpt;
2243 	int weak, strong;
2244 	int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2245 
2246 #ifdef CONFIG_MAC80211_DEBUGFS
2247 	if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2248 		IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2249 			       lq_sta->pers.dbg_fixed_txp_reduction);
2250 		lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2251 		return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2252 	}
2253 #endif
2254 
2255 	rcu_read_lock();
2256 	chanctx_conf = rcu_dereference(vif->chanctx_conf);
2257 	if (WARN_ON(!chanctx_conf))
2258 		band = NUM_NL80211_BANDS;
2259 	else
2260 		band = chanctx_conf->def.chan->band;
2261 	rcu_read_unlock();
2262 
2263 	if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2264 		IWL_DEBUG_RATE(mvm,
2265 			       "tpc is not allowed. remove txp restrictions\n");
2266 		lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2267 		return cur != TPC_NO_REDUCTION;
2268 	}
2269 
2270 	rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2271 
2272 	/* Collect measured throughputs for current and adjacent rates */
2273 	window = tbl->tpc_win;
2274 	sr = window[cur].success_ratio;
2275 	current_tpt = window[cur].average_tpt;
2276 	if (weak != TPC_INVALID)
2277 		weak_tpt = window[weak].average_tpt;
2278 	if (strong != TPC_INVALID)
2279 		strong_tpt = window[strong].average_tpt;
2280 
2281 	IWL_DEBUG_RATE(mvm,
2282 		       "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2283 		       cur, current_tpt, sr, weak, strong,
2284 		       weak_tpt, strong_tpt);
2285 
2286 	action = rs_get_tpc_action(mvm, sr, weak, strong,
2287 				   current_tpt, weak_tpt, strong_tpt);
2288 
2289 	/* override actions if we are on the edge */
2290 	if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2291 		IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2292 		action = TPC_ACTION_STAY;
2293 	} else if (strong == TPC_INVALID &&
2294 		   (action == TPC_ACTION_INCREASE ||
2295 		    action == TPC_ACTION_NO_RESTIRCTION)) {
2296 		IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2297 		action = TPC_ACTION_STAY;
2298 	}
2299 
2300 	switch (action) {
2301 	case TPC_ACTION_DECREASE:
2302 		lq_sta->lq.reduced_tpc = weak;
2303 		return true;
2304 	case TPC_ACTION_INCREASE:
2305 		lq_sta->lq.reduced_tpc = strong;
2306 		return true;
2307 	case TPC_ACTION_NO_RESTIRCTION:
2308 		lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2309 		return true;
2310 	case TPC_ACTION_STAY:
2311 		/* do nothing */
2312 		break;
2313 	}
2314 	return false;
2315 }
2316 
2317 /*
2318  * Do rate scaling and search for new modulation mode.
2319  */
2320 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2321 				  struct ieee80211_sta *sta,
2322 				  struct iwl_lq_sta *lq_sta,
2323 				  int tid, bool ndp)
2324 {
2325 	int low = IWL_RATE_INVALID;
2326 	int high = IWL_RATE_INVALID;
2327 	int index;
2328 	struct iwl_rate_scale_data *window = NULL;
2329 	int current_tpt = IWL_INVALID_VALUE;
2330 	int low_tpt = IWL_INVALID_VALUE;
2331 	int high_tpt = IWL_INVALID_VALUE;
2332 	u32 fail_count;
2333 	enum rs_action scale_action = RS_ACTION_STAY;
2334 	u16 rate_mask;
2335 	u8 update_lq = 0;
2336 	struct iwl_scale_tbl_info *tbl, *tbl1;
2337 	u8 active_tbl = 0;
2338 	u8 done_search = 0;
2339 	u16 high_low;
2340 	s32 sr;
2341 	u8 prev_agg = lq_sta->is_agg;
2342 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2343 	struct rs_rate *rate;
2344 
2345 	lq_sta->is_agg = !!mvmsta->agg_tids;
2346 
2347 	/*
2348 	 * Select rate-scale / modulation-mode table to work with in
2349 	 * the rest of this function:  "search" if searching for better
2350 	 * modulation mode, or "active" if doing rate scaling within a mode.
2351 	 */
2352 	if (!lq_sta->search_better_tbl)
2353 		active_tbl = lq_sta->active_tbl;
2354 	else
2355 		active_tbl = 1 - lq_sta->active_tbl;
2356 
2357 	tbl = &(lq_sta->lq_info[active_tbl]);
2358 	rate = &tbl->rate;
2359 
2360 	if (prev_agg != lq_sta->is_agg) {
2361 		IWL_DEBUG_RATE(mvm,
2362 			       "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2363 			       prev_agg, lq_sta->is_agg);
2364 		rs_set_expected_tpt_table(lq_sta, tbl);
2365 		rs_rate_scale_clear_tbl_windows(mvm, tbl);
2366 	}
2367 
2368 	/* current tx rate */
2369 	index = rate->index;
2370 
2371 	/* rates available for this association, and for modulation mode */
2372 	rate_mask = rs_get_supported_rates(lq_sta, rate);
2373 
2374 	if (!(BIT(index) & rate_mask)) {
2375 		IWL_ERR(mvm, "Current Rate is not valid\n");
2376 		if (lq_sta->search_better_tbl) {
2377 			/* revert to active table if search table is not valid*/
2378 			rate->type = LQ_NONE;
2379 			lq_sta->search_better_tbl = 0;
2380 			tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2381 			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2382 		}
2383 		return;
2384 	}
2385 
2386 	/* Get expected throughput table and history window for current rate */
2387 	if (!tbl->expected_tpt) {
2388 		IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2389 		return;
2390 	}
2391 
2392 	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2393 	window = &(tbl->win[index]);
2394 
2395 	/*
2396 	 * If there is not enough history to calculate actual average
2397 	 * throughput, keep analyzing results of more tx frames, without
2398 	 * changing rate or mode (bypass most of the rest of this function).
2399 	 * Set up new rate table in uCode only if old rate is not supported
2400 	 * in current association (use new rate found above).
2401 	 */
2402 	fail_count = window->counter - window->success_counter;
2403 	if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2404 	    (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2405 		IWL_DEBUG_RATE(mvm,
2406 			       "%s: Test Window: succ %d total %d\n",
2407 			       rs_pretty_rate(rate),
2408 			       window->success_counter, window->counter);
2409 
2410 		/* Can't calculate this yet; not enough history */
2411 		window->average_tpt = IWL_INVALID_VALUE;
2412 
2413 		/* Should we stay with this modulation mode,
2414 		 * or search for a new one? */
2415 		rs_stay_in_table(lq_sta, false);
2416 
2417 		return;
2418 	}
2419 
2420 	/* If we are searching for better modulation mode, check success. */
2421 	if (lq_sta->search_better_tbl) {
2422 		/* If good success, continue using the "search" mode;
2423 		 * no need to send new link quality command, since we're
2424 		 * continuing to use the setup that we've been trying. */
2425 		if (window->average_tpt > lq_sta->last_tpt) {
2426 			IWL_DEBUG_RATE(mvm,
2427 				       "SWITCHING TO NEW TABLE SR: %d "
2428 				       "cur-tpt %d old-tpt %d\n",
2429 				       window->success_ratio,
2430 				       window->average_tpt,
2431 				       lq_sta->last_tpt);
2432 
2433 			/* Swap tables; "search" becomes "active" */
2434 			lq_sta->active_tbl = active_tbl;
2435 			current_tpt = window->average_tpt;
2436 		/* Else poor success; go back to mode in "active" table */
2437 		} else {
2438 			IWL_DEBUG_RATE(mvm,
2439 				       "GOING BACK TO THE OLD TABLE: SR %d "
2440 				       "cur-tpt %d old-tpt %d\n",
2441 				       window->success_ratio,
2442 				       window->average_tpt,
2443 				       lq_sta->last_tpt);
2444 
2445 			/* Nullify "search" table */
2446 			rate->type = LQ_NONE;
2447 
2448 			/* Revert to "active" table */
2449 			active_tbl = lq_sta->active_tbl;
2450 			tbl = &(lq_sta->lq_info[active_tbl]);
2451 
2452 			/* Revert to "active" rate and throughput info */
2453 			index = tbl->rate.index;
2454 			current_tpt = lq_sta->last_tpt;
2455 
2456 			/* Need to set up a new rate table in uCode */
2457 			update_lq = 1;
2458 		}
2459 
2460 		/* Either way, we've made a decision; modulation mode
2461 		 * search is done, allow rate adjustment next time. */
2462 		lq_sta->search_better_tbl = 0;
2463 		done_search = 1;	/* Don't switch modes below! */
2464 		goto lq_update;
2465 	}
2466 
2467 	/* (Else) not in search of better modulation mode, try for better
2468 	 * starting rate, while staying in this mode. */
2469 	high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2470 	low = high_low & 0xff;
2471 	high = (high_low >> 8) & 0xff;
2472 
2473 	/* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2474 
2475 	sr = window->success_ratio;
2476 
2477 	/* Collect measured throughputs for current and adjacent rates */
2478 	current_tpt = window->average_tpt;
2479 	if (low != IWL_RATE_INVALID)
2480 		low_tpt = tbl->win[low].average_tpt;
2481 	if (high != IWL_RATE_INVALID)
2482 		high_tpt = tbl->win[high].average_tpt;
2483 
2484 	IWL_DEBUG_RATE(mvm,
2485 		       "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2486 		       rs_pretty_rate(rate), current_tpt, sr,
2487 		       low, high, low_tpt, high_tpt);
2488 
2489 	scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2490 					  current_tpt, low_tpt, high_tpt);
2491 
2492 	/* Force a search in case BT doesn't like us being in MIMO */
2493 	if (is_mimo(rate) &&
2494 	    !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2495 		IWL_DEBUG_RATE(mvm,
2496 			       "BT Coex forbids MIMO. Search for new config\n");
2497 		rs_stay_in_table(lq_sta, true);
2498 		goto lq_update;
2499 	}
2500 
2501 	switch (scale_action) {
2502 	case RS_ACTION_DOWNSCALE:
2503 		/* Decrease starting rate, update uCode's rate table */
2504 		if (low != IWL_RATE_INVALID) {
2505 			update_lq = 1;
2506 			index = low;
2507 		} else {
2508 			IWL_DEBUG_RATE(mvm,
2509 				       "At the bottom rate. Can't decrease\n");
2510 		}
2511 
2512 		break;
2513 	case RS_ACTION_UPSCALE:
2514 		/* Increase starting rate, update uCode's rate table */
2515 		if (high != IWL_RATE_INVALID) {
2516 			update_lq = 1;
2517 			index = high;
2518 		} else {
2519 			IWL_DEBUG_RATE(mvm,
2520 				       "At the top rate. Can't increase\n");
2521 		}
2522 
2523 		break;
2524 	case RS_ACTION_STAY:
2525 		/* No change */
2526 		if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2527 			update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2528 		break;
2529 	default:
2530 		break;
2531 	}
2532 
2533 lq_update:
2534 	/* Replace uCode's rate table for the destination station. */
2535 	if (update_lq) {
2536 		tbl->rate.index = index;
2537 		if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2538 			rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2539 		rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2540 		rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2541 	}
2542 
2543 	rs_stay_in_table(lq_sta, false);
2544 
2545 	/*
2546 	 * Search for new modulation mode if we're:
2547 	 * 1)  Not changing rates right now
2548 	 * 2)  Not just finishing up a search
2549 	 * 3)  Allowing a new search
2550 	 */
2551 	if (!update_lq && !done_search &&
2552 	    lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2553 	    && window->counter) {
2554 		enum rs_column next_column;
2555 
2556 		/* Save current throughput to compare with "search" throughput*/
2557 		lq_sta->last_tpt = current_tpt;
2558 
2559 		IWL_DEBUG_RATE(mvm,
2560 			       "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2561 			       update_lq, done_search, lq_sta->rs_state,
2562 			       window->counter);
2563 
2564 		next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2565 		if (next_column != RS_COLUMN_INVALID) {
2566 			int ret = rs_switch_to_column(mvm, lq_sta, sta,
2567 						      next_column);
2568 			if (!ret)
2569 				lq_sta->search_better_tbl = 1;
2570 		} else {
2571 			IWL_DEBUG_RATE(mvm,
2572 				       "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2573 			lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2574 		}
2575 
2576 		/* If new "search" mode was selected, set up in uCode table */
2577 		if (lq_sta->search_better_tbl) {
2578 			/* Access the "search" table, clear its history. */
2579 			tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2580 			rs_rate_scale_clear_tbl_windows(mvm, tbl);
2581 
2582 			/* Use new "search" start rate */
2583 			index = tbl->rate.index;
2584 
2585 			rs_dump_rate(mvm, &tbl->rate,
2586 				     "Switch to SEARCH TABLE:");
2587 			rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2588 		} else {
2589 			done_search = 1;
2590 		}
2591 	}
2592 
2593 	if (!ndp)
2594 		rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2595 
2596 	if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2597 		tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2598 		rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2599 	}
2600 }
2601 
2602 struct rs_init_rate_info {
2603 	s8 rssi;
2604 	u8 rate_idx;
2605 };
2606 
2607 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2608 	{ -60, IWL_RATE_54M_INDEX },
2609 	{ -64, IWL_RATE_48M_INDEX },
2610 	{ -68, IWL_RATE_36M_INDEX },
2611 	{ -80, IWL_RATE_24M_INDEX },
2612 	{ -84, IWL_RATE_18M_INDEX },
2613 	{ -85, IWL_RATE_12M_INDEX },
2614 	{ -86, IWL_RATE_11M_INDEX },
2615 	{ -88, IWL_RATE_5M_INDEX  },
2616 	{ -90, IWL_RATE_2M_INDEX  },
2617 	{ S8_MIN, IWL_RATE_1M_INDEX },
2618 };
2619 
2620 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2621 	{ -60, IWL_RATE_54M_INDEX },
2622 	{ -64, IWL_RATE_48M_INDEX },
2623 	{ -72, IWL_RATE_36M_INDEX },
2624 	{ -80, IWL_RATE_24M_INDEX },
2625 	{ -84, IWL_RATE_18M_INDEX },
2626 	{ -85, IWL_RATE_12M_INDEX },
2627 	{ -87, IWL_RATE_9M_INDEX  },
2628 	{ S8_MIN, IWL_RATE_6M_INDEX },
2629 };
2630 
2631 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2632 	{ -60, IWL_RATE_MCS_7_INDEX },
2633 	{ -64, IWL_RATE_MCS_6_INDEX },
2634 	{ -68, IWL_RATE_MCS_5_INDEX },
2635 	{ -72, IWL_RATE_MCS_4_INDEX },
2636 	{ -80, IWL_RATE_MCS_3_INDEX },
2637 	{ -84, IWL_RATE_MCS_2_INDEX },
2638 	{ -85, IWL_RATE_MCS_1_INDEX },
2639 	{ S8_MIN, IWL_RATE_MCS_0_INDEX},
2640 };
2641 
2642 /* MCS index 9 is not valid for 20MHz VHT channel width,
2643  * but is ok for 40, 80 and 160MHz channels.
2644  */
2645 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2646 	{ -60, IWL_RATE_MCS_8_INDEX },
2647 	{ -64, IWL_RATE_MCS_7_INDEX },
2648 	{ -68, IWL_RATE_MCS_6_INDEX },
2649 	{ -72, IWL_RATE_MCS_5_INDEX },
2650 	{ -80, IWL_RATE_MCS_4_INDEX },
2651 	{ -84, IWL_RATE_MCS_3_INDEX },
2652 	{ -85, IWL_RATE_MCS_2_INDEX },
2653 	{ -87, IWL_RATE_MCS_1_INDEX },
2654 	{ S8_MIN, IWL_RATE_MCS_0_INDEX},
2655 };
2656 
2657 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2658 	{ -60, IWL_RATE_MCS_9_INDEX },
2659 	{ -64, IWL_RATE_MCS_8_INDEX },
2660 	{ -68, IWL_RATE_MCS_7_INDEX },
2661 	{ -72, IWL_RATE_MCS_6_INDEX },
2662 	{ -80, IWL_RATE_MCS_5_INDEX },
2663 	{ -84, IWL_RATE_MCS_4_INDEX },
2664 	{ -85, IWL_RATE_MCS_3_INDEX },
2665 	{ -87, IWL_RATE_MCS_2_INDEX },
2666 	{ -88, IWL_RATE_MCS_1_INDEX },
2667 	{ S8_MIN, IWL_RATE_MCS_0_INDEX },
2668 };
2669 
2670 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2671 
2672 /* Init the optimal rate based on STA caps
2673  * This combined with rssi is used to report the last tx rate
2674  * to userspace when we haven't transmitted enough frames.
2675  */
2676 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2677 				 struct ieee80211_sta *sta,
2678 				 struct iwl_lq_sta *lq_sta)
2679 {
2680 	struct rs_rate *rate = &lq_sta->optimal_rate;
2681 
2682 	if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2683 		rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2684 	else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2685 		rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2686 	else if (lq_sta->band == NL80211_BAND_5GHZ)
2687 		rate->type = LQ_LEGACY_A;
2688 	else
2689 		rate->type = LQ_LEGACY_G;
2690 
2691 	rate->bw = rs_bw_from_sta_bw(sta);
2692 	rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2693 
2694 	/* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2695 
2696 	if (is_mimo(rate)) {
2697 		lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2698 	} else if (is_siso(rate)) {
2699 		lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2700 	} else {
2701 		lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2702 
2703 		if (lq_sta->band == NL80211_BAND_5GHZ) {
2704 			lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2705 			lq_sta->optimal_nentries =
2706 				ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2707 		} else {
2708 			lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2709 			lq_sta->optimal_nentries =
2710 				ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2711 		}
2712 	}
2713 
2714 	if (is_vht(rate)) {
2715 		if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2716 			lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2717 			lq_sta->optimal_nentries =
2718 				ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2719 		} else {
2720 			lq_sta->optimal_rates = rs_optimal_rates_vht;
2721 			lq_sta->optimal_nentries =
2722 				ARRAY_SIZE(rs_optimal_rates_vht);
2723 		}
2724 	} else if (is_ht(rate)) {
2725 		lq_sta->optimal_rates = rs_optimal_rates_ht;
2726 		lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2727 	}
2728 }
2729 
2730 /* Compute the optimal rate index based on RSSI */
2731 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2732 					   struct iwl_lq_sta *lq_sta)
2733 {
2734 	struct rs_rate *rate = &lq_sta->optimal_rate;
2735 	int i;
2736 
2737 	rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2738 				     BITS_PER_LONG);
2739 
2740 	for (i = 0; i < lq_sta->optimal_nentries; i++) {
2741 		int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2742 
2743 		if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2744 		    (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2745 			rate->index = rate_idx;
2746 			break;
2747 		}
2748 	}
2749 
2750 	return rate;
2751 }
2752 
2753 /* Choose an initial legacy rate and antenna to use based on the RSSI
2754  * of last Rx
2755  */
2756 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2757 				struct ieee80211_sta *sta,
2758 				struct iwl_lq_sta *lq_sta,
2759 				enum nl80211_band band,
2760 				struct rs_rate *rate)
2761 {
2762 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2763 	int i, nentries;
2764 	unsigned long active_rate;
2765 	s8 best_rssi = S8_MIN;
2766 	u8 best_ant = ANT_NONE;
2767 	u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2768 	const struct rs_init_rate_info *initial_rates;
2769 
2770 	for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2771 		if (!(lq_sta->pers.chains & BIT(i)))
2772 			continue;
2773 
2774 		if (lq_sta->pers.chain_signal[i] > best_rssi) {
2775 			best_rssi = lq_sta->pers.chain_signal[i];
2776 			best_ant = BIT(i);
2777 		}
2778 	}
2779 
2780 	IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2781 		       rs_pretty_ant(best_ant), best_rssi);
2782 
2783 	if (best_ant != ANT_A && best_ant != ANT_B)
2784 		rate->ant = first_antenna(valid_tx_ant);
2785 	else
2786 		rate->ant = best_ant;
2787 
2788 	rate->sgi = false;
2789 	rate->ldpc = false;
2790 	rate->bw = RATE_MCS_CHAN_WIDTH_20;
2791 
2792 	rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2793 				     BITS_PER_LONG);
2794 
2795 	if (band == NL80211_BAND_5GHZ) {
2796 		rate->type = LQ_LEGACY_A;
2797 		initial_rates = rs_optimal_rates_5ghz_legacy;
2798 		nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2799 	} else {
2800 		rate->type = LQ_LEGACY_G;
2801 		initial_rates = rs_optimal_rates_24ghz_legacy;
2802 		nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2803 	}
2804 
2805 	if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2806 		goto out;
2807 
2808 	/* Start from a higher rate if the corresponding debug capability
2809 	 * is enabled. The rate is chosen according to AP capabilities.
2810 	 * In case of VHT/HT when the rssi is low fallback to the case of
2811 	 * legacy rates.
2812 	 */
2813 	if (sta->vht_cap.vht_supported &&
2814 	    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2815 		/*
2816 		 * In AP mode, when a new station associates, rs is initialized
2817 		 * immediately upon association completion, before the phy
2818 		 * context is updated with the association parameters, so the
2819 		 * sta bandwidth might be wider than the phy context allows.
2820 		 * To avoid this issue, always initialize rs with 20mhz
2821 		 * bandwidth rate, and after authorization, when the phy context
2822 		 * is already up-to-date, re-init rs with the correct bw.
2823 		 */
2824 		u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2825 				RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2826 
2827 		switch (bw) {
2828 		case RATE_MCS_CHAN_WIDTH_40:
2829 		case RATE_MCS_CHAN_WIDTH_80:
2830 		case RATE_MCS_CHAN_WIDTH_160:
2831 			initial_rates = rs_optimal_rates_vht;
2832 			nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2833 			break;
2834 		case RATE_MCS_CHAN_WIDTH_20:
2835 			initial_rates = rs_optimal_rates_vht_20mhz;
2836 			nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2837 			break;
2838 		default:
2839 			IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2840 			goto out;
2841 		}
2842 
2843 		active_rate = lq_sta->active_siso_rate;
2844 		rate->type = LQ_VHT_SISO;
2845 		rate->bw = bw;
2846 	} else if (sta->ht_cap.ht_supported &&
2847 		   best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2848 		initial_rates = rs_optimal_rates_ht;
2849 		nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2850 		active_rate = lq_sta->active_siso_rate;
2851 		rate->type = LQ_HT_SISO;
2852 	} else {
2853 		active_rate = lq_sta->active_legacy_rate;
2854 	}
2855 
2856 	for (i = 0; i < nentries; i++) {
2857 		int rate_idx = initial_rates[i].rate_idx;
2858 
2859 		if ((best_rssi >= initial_rates[i].rssi) &&
2860 		    (BIT(rate_idx) & active_rate)) {
2861 			rate->index = rate_idx;
2862 			break;
2863 		}
2864 	}
2865 
2866 out:
2867 	rs_dump_rate(mvm, rate, "INITIAL");
2868 }
2869 
2870 /* Save info about RSSI of last Rx */
2871 void rs_update_last_rssi(struct iwl_mvm *mvm,
2872 			 struct iwl_mvm_sta *mvmsta,
2873 			 struct ieee80211_rx_status *rx_status)
2874 {
2875 	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2876 	int i;
2877 
2878 	lq_sta->pers.chains = rx_status->chains;
2879 	lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2880 	lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2881 	lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2882 	lq_sta->pers.last_rssi = S8_MIN;
2883 
2884 	for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2885 		if (!(lq_sta->pers.chains & BIT(i)))
2886 			continue;
2887 
2888 		if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2889 			lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2890 	}
2891 }
2892 
2893 /**
2894  * rs_initialize_lq - Initialize a station's hardware rate table
2895  *
2896  * The uCode's station table contains a table of fallback rates
2897  * for automatic fallback during transmission.
2898  *
2899  * NOTE: This sets up a default set of values.  These will be replaced later
2900  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2901  *       rc80211_simple.
2902  *
2903  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2904  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2905  *       which requires station table entry to exist).
2906  */
2907 static void rs_initialize_lq(struct iwl_mvm *mvm,
2908 			     struct ieee80211_sta *sta,
2909 			     struct iwl_lq_sta *lq_sta,
2910 			     enum nl80211_band band, bool update)
2911 {
2912 	struct iwl_scale_tbl_info *tbl;
2913 	struct rs_rate *rate;
2914 	u8 active_tbl = 0;
2915 
2916 	if (!sta || !lq_sta)
2917 		return;
2918 
2919 	if (!lq_sta->search_better_tbl)
2920 		active_tbl = lq_sta->active_tbl;
2921 	else
2922 		active_tbl = 1 - lq_sta->active_tbl;
2923 
2924 	tbl = &(lq_sta->lq_info[active_tbl]);
2925 	rate = &tbl->rate;
2926 
2927 	rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2928 	rs_init_optimal_rate(mvm, sta, lq_sta);
2929 
2930 	WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2931 		  "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2932 		  rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2933 		  mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2934 
2935 	tbl->column = rs_get_column_from_rate(rate);
2936 
2937 	rs_set_expected_tpt_table(lq_sta, tbl);
2938 	rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2939 	/* TODO restore station should remember the lq cmd */
2940 	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, !update);
2941 }
2942 
2943 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2944 			    void *mvm_sta,
2945 			    struct ieee80211_tx_rate_control *txrc)
2946 {
2947 	struct iwl_op_mode *op_mode = mvm_r;
2948 	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2949 	struct sk_buff *skb = txrc->skb;
2950 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2951 	struct iwl_lq_sta *lq_sta;
2952 	struct rs_rate *optimal_rate;
2953 	u32 last_ucode_rate;
2954 
2955 	if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2956 		/* if vif isn't initialized mvm doesn't know about
2957 		 * this station, so don't do anything with the it
2958 		 */
2959 		sta = NULL;
2960 		mvm_sta = NULL;
2961 	}
2962 
2963 	/* Send management frames and NO_ACK data using lowest rate. */
2964 	if (rate_control_send_low(sta, mvm_sta, txrc))
2965 		return;
2966 
2967 	if (!mvm_sta)
2968 		return;
2969 
2970 	lq_sta = mvm_sta;
2971 	iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2972 				  info->band, &info->control.rates[0]);
2973 	info->control.rates[0].count = 1;
2974 
2975 	/* Report the optimal rate based on rssi and STA caps if we haven't
2976 	 * converged yet (too little traffic) or exploring other modulations
2977 	 */
2978 	if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2979 		optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2980 		last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2981 							  optimal_rate);
2982 		iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2983 					  &txrc->reported_rate);
2984 	}
2985 }
2986 
2987 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2988 			      gfp_t gfp)
2989 {
2990 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2991 	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2992 	struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2993 	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2994 
2995 	IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2996 
2997 	lq_sta->pers.drv = mvm;
2998 #ifdef CONFIG_MAC80211_DEBUGFS
2999 	lq_sta->pers.dbg_fixed_rate = 0;
3000 	lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
3001 	lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3002 #endif
3003 	lq_sta->pers.chains = 0;
3004 	memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
3005 	lq_sta->pers.last_rssi = S8_MIN;
3006 
3007 	return lq_sta;
3008 }
3009 
3010 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
3011 				       int nss)
3012 {
3013 	u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
3014 		(0x3 << (2 * (nss - 1)));
3015 	rx_mcs >>= (2 * (nss - 1));
3016 
3017 	if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
3018 		return IWL_RATE_MCS_7_INDEX;
3019 	else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
3020 		return IWL_RATE_MCS_8_INDEX;
3021 	else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
3022 		return IWL_RATE_MCS_9_INDEX;
3023 
3024 	WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
3025 	return -1;
3026 }
3027 
3028 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
3029 				     struct ieee80211_sta_vht_cap *vht_cap,
3030 				     struct iwl_lq_sta *lq_sta)
3031 {
3032 	int i;
3033 	int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
3034 
3035 	if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3036 		for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3037 			if (i == IWL_RATE_9M_INDEX)
3038 				continue;
3039 
3040 			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3041 			if (i == IWL_RATE_MCS_9_INDEX &&
3042 			    sta->bandwidth == IEEE80211_STA_RX_BW_20)
3043 				continue;
3044 
3045 			lq_sta->active_siso_rate |= BIT(i);
3046 		}
3047 	}
3048 
3049 	if (sta->rx_nss < 2)
3050 		return;
3051 
3052 	highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
3053 	if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3054 		for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3055 			if (i == IWL_RATE_9M_INDEX)
3056 				continue;
3057 
3058 			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3059 			if (i == IWL_RATE_MCS_9_INDEX &&
3060 			    sta->bandwidth == IEEE80211_STA_RX_BW_20)
3061 				continue;
3062 
3063 			lq_sta->active_mimo2_rate |= BIT(i);
3064 		}
3065 	}
3066 }
3067 
3068 static void rs_ht_init(struct iwl_mvm *mvm,
3069 		       struct ieee80211_sta *sta,
3070 		       struct iwl_lq_sta *lq_sta,
3071 		       struct ieee80211_sta_ht_cap *ht_cap)
3072 {
3073 	/* active_siso_rate mask includes 9 MBits (bit 5),
3074 	 * and CCK (bits 0-3), supp_rates[] does not;
3075 	 * shift to convert format, force 9 MBits off.
3076 	 */
3077 	lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3078 	lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3079 	lq_sta->active_siso_rate &= ~((u16)0x2);
3080 	lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3081 
3082 	lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3083 	lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3084 	lq_sta->active_mimo2_rate &= ~((u16)0x2);
3085 	lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3086 
3087 	if (mvm->cfg->ht_params->ldpc &&
3088 	    (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3089 		lq_sta->ldpc = true;
3090 
3091 	if (mvm->cfg->ht_params->stbc &&
3092 	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3093 	    (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3094 		lq_sta->stbc_capable = true;
3095 
3096 	lq_sta->is_vht = false;
3097 }
3098 
3099 static void rs_vht_init(struct iwl_mvm *mvm,
3100 			struct ieee80211_sta *sta,
3101 			struct iwl_lq_sta *lq_sta,
3102 			struct ieee80211_sta_vht_cap *vht_cap)
3103 {
3104 	rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3105 
3106 	if (mvm->cfg->ht_params->ldpc &&
3107 	    (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3108 		lq_sta->ldpc = true;
3109 
3110 	if (mvm->cfg->ht_params->stbc &&
3111 	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3112 	    (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3113 		lq_sta->stbc_capable = true;
3114 
3115 	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3116 	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3117 	    (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3118 		lq_sta->bfer_capable = true;
3119 
3120 	lq_sta->is_vht = true;
3121 }
3122 
3123 #ifdef CONFIG_IWLWIFI_DEBUGFS
3124 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3125 {
3126 	spin_lock_bh(&mvm->drv_stats_lock);
3127 	memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3128 	spin_unlock_bh(&mvm->drv_stats_lock);
3129 }
3130 
3131 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3132 {
3133 	u8 nss = 0;
3134 
3135 	spin_lock(&mvm->drv_stats_lock);
3136 
3137 	if (agg)
3138 		mvm->drv_rx_stats.agg_frames++;
3139 
3140 	mvm->drv_rx_stats.success_frames++;
3141 
3142 	switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3143 	case RATE_MCS_CHAN_WIDTH_20:
3144 		mvm->drv_rx_stats.bw_20_frames++;
3145 		break;
3146 	case RATE_MCS_CHAN_WIDTH_40:
3147 		mvm->drv_rx_stats.bw_40_frames++;
3148 		break;
3149 	case RATE_MCS_CHAN_WIDTH_80:
3150 		mvm->drv_rx_stats.bw_80_frames++;
3151 		break;
3152 	case RATE_MCS_CHAN_WIDTH_160:
3153 		mvm->drv_rx_stats.bw_160_frames++;
3154 		break;
3155 	default:
3156 		WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3157 	}
3158 
3159 	if (rate & RATE_MCS_HT_MSK) {
3160 		mvm->drv_rx_stats.ht_frames++;
3161 		nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3162 	} else if (rate & RATE_MCS_VHT_MSK) {
3163 		mvm->drv_rx_stats.vht_frames++;
3164 		nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3165 		       RATE_VHT_MCS_NSS_POS) + 1;
3166 	} else {
3167 		mvm->drv_rx_stats.legacy_frames++;
3168 	}
3169 
3170 	if (nss == 1)
3171 		mvm->drv_rx_stats.siso_frames++;
3172 	else if (nss == 2)
3173 		mvm->drv_rx_stats.mimo2_frames++;
3174 
3175 	if (rate & RATE_MCS_SGI_MSK)
3176 		mvm->drv_rx_stats.sgi_frames++;
3177 	else
3178 		mvm->drv_rx_stats.ngi_frames++;
3179 
3180 	mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3181 	mvm->drv_rx_stats.last_frame_idx =
3182 		(mvm->drv_rx_stats.last_frame_idx + 1) %
3183 			ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3184 
3185 	spin_unlock(&mvm->drv_stats_lock);
3186 }
3187 #endif
3188 
3189 /*
3190  * Called after adding a new station to initialize rate scaling
3191  */
3192 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3193 			     enum nl80211_band band, bool update)
3194 {
3195 	int i, j;
3196 	struct ieee80211_hw *hw = mvm->hw;
3197 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3198 	struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3199 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3200 	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3201 	struct ieee80211_supported_band *sband;
3202 	unsigned long supp; /* must be unsigned long for for_each_set_bit */
3203 
3204 	/* clear all non-persistent lq data */
3205 	memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3206 
3207 	sband = hw->wiphy->bands[band];
3208 
3209 	lq_sta->lq.sta_id = mvmsta->sta_id;
3210 	mvmsta->amsdu_enabled = 0;
3211 	mvmsta->max_amsdu_len = sta->max_amsdu_len;
3212 
3213 	for (j = 0; j < LQ_SIZE; j++)
3214 		rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3215 
3216 	lq_sta->flush_timer = 0;
3217 	lq_sta->last_tx = jiffies;
3218 
3219 	IWL_DEBUG_RATE(mvm,
3220 		       "LQ: *** rate scale station global init for station %d ***\n",
3221 		       mvmsta->sta_id);
3222 	/* TODO: what is a good starting rate for STA? About middle? Maybe not
3223 	 * the lowest or the highest rate.. Could consider using RSSI from
3224 	 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3225 	 * after assoc.. */
3226 
3227 	lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3228 	lq_sta->band = sband->band;
3229 	/*
3230 	 * active legacy rates as per supported rates bitmap
3231 	 */
3232 	supp = sta->supp_rates[sband->band];
3233 	lq_sta->active_legacy_rate = 0;
3234 	for_each_set_bit(i, &supp, BITS_PER_LONG)
3235 		lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3236 
3237 	/* TODO: should probably account for rx_highest for both HT/VHT */
3238 	if (!vht_cap || !vht_cap->vht_supported)
3239 		rs_ht_init(mvm, sta, lq_sta, ht_cap);
3240 	else
3241 		rs_vht_init(mvm, sta, lq_sta, vht_cap);
3242 
3243 	lq_sta->max_legacy_rate_idx =
3244 		rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3245 	lq_sta->max_siso_rate_idx =
3246 		rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3247 	lq_sta->max_mimo2_rate_idx =
3248 		rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3249 
3250 	IWL_DEBUG_RATE(mvm,
3251 		       "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3252 		       lq_sta->active_legacy_rate,
3253 		       lq_sta->active_siso_rate,
3254 		       lq_sta->active_mimo2_rate,
3255 		       lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3256 		       lq_sta->bfer_capable);
3257 	IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3258 		       lq_sta->max_legacy_rate_idx,
3259 		       lq_sta->max_siso_rate_idx,
3260 		       lq_sta->max_mimo2_rate_idx);
3261 
3262 	/* These values will be overridden later */
3263 	lq_sta->lq.single_stream_ant_msk =
3264 		iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
3265 	lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3266 
3267 	/* as default allow aggregation for all tids */
3268 	lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3269 	lq_sta->is_agg = 0;
3270 #ifdef CONFIG_IWLWIFI_DEBUGFS
3271 	iwl_mvm_reset_frame_stats(mvm);
3272 #endif
3273 	rs_initialize_lq(mvm, sta, lq_sta, band, update);
3274 }
3275 
3276 static void rs_drv_rate_update(void *mvm_r,
3277 			       struct ieee80211_supported_band *sband,
3278 			       struct cfg80211_chan_def *chandef,
3279 			       struct ieee80211_sta *sta,
3280 			       void *priv_sta, u32 changed)
3281 {
3282 	struct iwl_op_mode *op_mode = mvm_r;
3283 	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3284 	u8 tid;
3285 
3286 	if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3287 		return;
3288 
3289 	/* Stop any ongoing aggregations as rs starts off assuming no agg */
3290 	for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3291 		ieee80211_stop_tx_ba_session(sta, tid);
3292 
3293 	iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3294 }
3295 
3296 #ifdef CONFIG_MAC80211_DEBUGFS
3297 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3298 					    struct iwl_lq_cmd *lq_cmd,
3299 					    enum nl80211_band band,
3300 					    u32 ucode_rate)
3301 {
3302 	struct rs_rate rate;
3303 	int i;
3304 	int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3305 	__le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3306 	u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3307 
3308 	for (i = 0; i < num_rates; i++)
3309 		lq_cmd->rs_table[i] = ucode_rate_le32;
3310 
3311 	if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3312 		WARN_ON_ONCE(1);
3313 		return;
3314 	}
3315 
3316 	if (is_mimo(&rate))
3317 		lq_cmd->mimo_delim = num_rates - 1;
3318 	else
3319 		lq_cmd->mimo_delim = 0;
3320 
3321 	lq_cmd->reduced_tpc = 0;
3322 
3323 	if (num_of_ant(ant) == 1)
3324 		lq_cmd->single_stream_ant_msk = ant;
3325 
3326 	if (!mvm->trans->cfg->gen2)
3327 		lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3328 	else
3329 		lq_cmd->agg_frame_cnt_limit =
3330 			LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3331 }
3332 #endif /* CONFIG_MAC80211_DEBUGFS */
3333 
3334 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3335 				     struct iwl_lq_sta *lq_sta,
3336 				     struct rs_rate *rate,
3337 				     __le32 *rs_table, int *rs_table_index,
3338 				     int num_rates, int num_retries,
3339 				     u8 valid_tx_ant, bool toggle_ant)
3340 {
3341 	int i, j;
3342 	__le32 ucode_rate;
3343 	bool bottom_reached = false;
3344 	int prev_rate_idx = rate->index;
3345 	int end = LINK_QUAL_MAX_RETRY_NUM;
3346 	int index = *rs_table_index;
3347 
3348 	for (i = 0; i < num_rates && index < end; i++) {
3349 		for (j = 0; j < num_retries && index < end; j++, index++) {
3350 			ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3351 									 rate));
3352 			rs_table[index] = ucode_rate;
3353 			if (toggle_ant)
3354 				rs_toggle_antenna(valid_tx_ant, rate);
3355 		}
3356 
3357 		prev_rate_idx = rate->index;
3358 		bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3359 		if (bottom_reached && !is_legacy(rate))
3360 			break;
3361 	}
3362 
3363 	if (!bottom_reached && !is_legacy(rate))
3364 		rate->index = prev_rate_idx;
3365 
3366 	*rs_table_index = index;
3367 }
3368 
3369 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3370  * column the rate table should look like this:
3371  *
3372  * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3373  * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3374  * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3375  * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3376  * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3377  * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3378  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3379  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3380  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3381  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3382  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3383  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3384  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3385  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3386  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3387  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3388  */
3389 static void rs_build_rates_table(struct iwl_mvm *mvm,
3390 				 struct ieee80211_sta *sta,
3391 				 struct iwl_lq_sta *lq_sta,
3392 				 const struct rs_rate *initial_rate)
3393 {
3394 	struct rs_rate rate;
3395 	int num_rates, num_retries, index = 0;
3396 	u8 valid_tx_ant = 0;
3397 	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3398 	bool toggle_ant = false;
3399 	u32 color;
3400 
3401 	memcpy(&rate, initial_rate, sizeof(rate));
3402 
3403 	valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3404 
3405 	/* TODO: remove old API when min FW API hits 14 */
3406 	if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3407 	    rs_stbc_allow(mvm, sta, lq_sta))
3408 		rate.stbc = true;
3409 
3410 	if (is_siso(&rate)) {
3411 		num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3412 		num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3413 	} else if (is_mimo(&rate)) {
3414 		num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3415 		num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3416 	} else {
3417 		num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3418 		num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3419 		toggle_ant = true;
3420 	}
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 	if (is_siso(&rate)) {
3429 		num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3430 		num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3431 		lq_cmd->mimo_delim = index;
3432 	} else if (is_legacy(&rate)) {
3433 		num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3434 		num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3435 	} else {
3436 		WARN_ON_ONCE(1);
3437 	}
3438 
3439 	toggle_ant = true;
3440 
3441 	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3442 				 num_rates, num_retries, valid_tx_ant,
3443 				 toggle_ant);
3444 
3445 	rs_get_lower_rate_down_column(lq_sta, &rate);
3446 
3447 	num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3448 	num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3449 
3450 	rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3451 				 num_rates, num_retries, valid_tx_ant,
3452 				 toggle_ant);
3453 
3454 	/* update the color of the LQ command (as a counter at bits 1-3) */
3455 	color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3456 	lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3457 }
3458 
3459 struct rs_bfer_active_iter_data {
3460 	struct ieee80211_sta *exclude_sta;
3461 	struct iwl_mvm_sta *bfer_mvmsta;
3462 };
3463 
3464 static void rs_bfer_active_iter(void *_data,
3465 				struct ieee80211_sta *sta)
3466 {
3467 	struct rs_bfer_active_iter_data *data = _data;
3468 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3469 	struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3470 	u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3471 
3472 	if (sta == data->exclude_sta)
3473 		return;
3474 
3475 	/* The current sta has BFER allowed */
3476 	if (ss_params & LQ_SS_BFER_ALLOWED) {
3477 		WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3478 
3479 		data->bfer_mvmsta = mvmsta;
3480 	}
3481 }
3482 
3483 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3484 {
3485 	int prio = -1;
3486 	enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3487 
3488 	switch (viftype) {
3489 	case NL80211_IFTYPE_AP:
3490 	case NL80211_IFTYPE_P2P_GO:
3491 		prio = 3;
3492 		break;
3493 	case NL80211_IFTYPE_P2P_CLIENT:
3494 		prio = 2;
3495 		break;
3496 	case NL80211_IFTYPE_STATION:
3497 		prio = 1;
3498 		break;
3499 	default:
3500 		WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3501 		prio = -1;
3502 	}
3503 
3504 	return prio;
3505 }
3506 
3507 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3508 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3509 				struct iwl_mvm_sta *sta2)
3510 {
3511 	int prio1 = rs_bfer_priority(sta1);
3512 	int prio2 = rs_bfer_priority(sta2);
3513 
3514 	if (prio1 > prio2)
3515 		return 1;
3516 	if (prio1 < prio2)
3517 		return -1;
3518 	return 0;
3519 }
3520 
3521 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3522 				struct ieee80211_sta *sta,
3523 				struct iwl_lq_sta *lq_sta,
3524 				const struct rs_rate *initial_rate)
3525 {
3526 	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3527 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3528 	struct rs_bfer_active_iter_data data = {
3529 		.exclude_sta = sta,
3530 		.bfer_mvmsta = NULL,
3531 	};
3532 	struct iwl_mvm_sta *bfer_mvmsta = NULL;
3533 	u32 ss_params = LQ_SS_PARAMS_VALID;
3534 
3535 	if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3536 		goto out;
3537 
3538 #ifdef CONFIG_MAC80211_DEBUGFS
3539 	/* Check if forcing the decision is configured.
3540 	 * Note that SISO is forced by not allowing STBC or BFER
3541 	 */
3542 	if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3543 		ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3544 	else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3545 		ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3546 
3547 	if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3548 		IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3549 			       lq_sta->pers.ss_force);
3550 		goto out;
3551 	}
3552 #endif
3553 
3554 	if (lq_sta->stbc_capable)
3555 		ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3556 
3557 	if (!lq_sta->bfer_capable)
3558 		goto out;
3559 
3560 	ieee80211_iterate_stations_atomic(mvm->hw,
3561 					  rs_bfer_active_iter,
3562 					  &data);
3563 	bfer_mvmsta = data.bfer_mvmsta;
3564 
3565 	/* This code is safe as it doesn't run concurrently for different
3566 	 * stations. This is guaranteed by the fact that calls to
3567 	 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3568 	 */
3569 	if (!bfer_mvmsta) {
3570 		IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3571 
3572 		ss_params |= LQ_SS_BFER_ALLOWED;
3573 		goto out;
3574 	}
3575 
3576 	IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3577 		       bfer_mvmsta->sta_id);
3578 
3579 	/* Disallow BFER on another STA if active and we're a higher priority */
3580 	if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3581 		struct iwl_lq_cmd *bfersta_lq_cmd =
3582 			&bfer_mvmsta->lq_sta.rs_drv.lq;
3583 		u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3584 
3585 		bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3586 		bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3587 		iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3588 
3589 		ss_params |= LQ_SS_BFER_ALLOWED;
3590 		IWL_DEBUG_RATE(mvm,
3591 			       "Lower priority BFER sta found (%d). Switch BFER\n",
3592 			       bfer_mvmsta->sta_id);
3593 	}
3594 out:
3595 	lq_cmd->ss_params = cpu_to_le32(ss_params);
3596 }
3597 
3598 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3599 			   struct ieee80211_sta *sta,
3600 			   struct iwl_lq_sta *lq_sta,
3601 			   const struct rs_rate *initial_rate)
3602 {
3603 	struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3604 	struct iwl_mvm_sta *mvmsta;
3605 	struct iwl_mvm_vif *mvmvif;
3606 
3607 	lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3608 	lq_cmd->agg_time_limit =
3609 		cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3610 
3611 #ifdef CONFIG_MAC80211_DEBUGFS
3612 	if (lq_sta->pers.dbg_fixed_rate) {
3613 		rs_build_rates_table_from_fixed(mvm, lq_cmd,
3614 						lq_sta->band,
3615 						lq_sta->pers.dbg_fixed_rate);
3616 		return;
3617 	}
3618 #endif
3619 	if (WARN_ON_ONCE(!sta || !initial_rate))
3620 		return;
3621 
3622 	rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3623 
3624 	if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3625 		rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3626 
3627 	mvmsta = iwl_mvm_sta_from_mac80211(sta);
3628 	mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3629 
3630 	if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3631 	    num_of_ant(initial_rate->ant) == 1)
3632 		lq_cmd->single_stream_ant_msk = initial_rate->ant;
3633 
3634 	lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3635 
3636 	/*
3637 	 * In case of low latency, tell the firmware to leave a frame in the
3638 	 * Tx Fifo so that it can start a transaction in the same TxOP. This
3639 	 * basically allows the firmware to send bursts.
3640 	 */
3641 	if (iwl_mvm_vif_low_latency(mvmvif))
3642 		lq_cmd->agg_frame_cnt_limit--;
3643 
3644 	if (mvmsta->vif->p2p)
3645 		lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3646 
3647 	lq_cmd->agg_time_limit =
3648 			cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3649 }
3650 
3651 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3652 {
3653 	return hw->priv;
3654 }
3655 
3656 /* rate scale requires free function to be implemented */
3657 static void rs_free(void *mvm_rate)
3658 {
3659 	return;
3660 }
3661 
3662 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3663 {
3664 	struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3665 	struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3666 
3667 	IWL_DEBUG_RATE(mvm, "enter\n");
3668 	IWL_DEBUG_RATE(mvm, "leave\n");
3669 }
3670 
3671 #ifdef CONFIG_MAC80211_DEBUGFS
3672 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3673 {
3674 
3675 	char *type, *bw;
3676 	u8 mcs = 0, nss = 0;
3677 	u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3678 
3679 	if (!(rate & RATE_MCS_HT_MSK) &&
3680 	    !(rate & RATE_MCS_VHT_MSK) &&
3681 	    !(rate & RATE_MCS_HE_MSK)) {
3682 		int index = iwl_hwrate_to_plcp_idx(rate);
3683 
3684 		return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n",
3685 				 rs_pretty_ant(ant),
3686 				 index == IWL_RATE_INVALID ? "BAD" :
3687 				 iwl_rate_mcs[index].mbps);
3688 	}
3689 
3690 	if (rate & RATE_MCS_VHT_MSK) {
3691 		type = "VHT";
3692 		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3693 		nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3694 		       >> RATE_VHT_MCS_NSS_POS) + 1;
3695 	} else if (rate & RATE_MCS_HT_MSK) {
3696 		type = "HT";
3697 		mcs = rate & RATE_HT_MCS_INDEX_MSK;
3698 		nss = ((rate & RATE_HT_MCS_NSS_MSK)
3699 		       >> RATE_HT_MCS_NSS_POS) + 1;
3700 	} else if (rate & RATE_MCS_HE_MSK) {
3701 		type = "HE";
3702 		mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3703 		nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3704 		       >> RATE_VHT_MCS_NSS_POS) + 1;
3705 	} else {
3706 		type = "Unknown"; /* shouldn't happen */
3707 	}
3708 
3709 	switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3710 	case RATE_MCS_CHAN_WIDTH_20:
3711 		bw = "20Mhz";
3712 		break;
3713 	case RATE_MCS_CHAN_WIDTH_40:
3714 		bw = "40Mhz";
3715 		break;
3716 	case RATE_MCS_CHAN_WIDTH_80:
3717 		bw = "80Mhz";
3718 		break;
3719 	case RATE_MCS_CHAN_WIDTH_160:
3720 		bw = "160Mhz";
3721 		break;
3722 	default:
3723 		bw = "BAD BW";
3724 	}
3725 
3726 	return scnprintf(buf, bufsz,
3727 			 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3728 			 type, rs_pretty_ant(ant), bw, mcs, nss,
3729 			 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3730 			 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3731 			 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3732 			 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3733 }
3734 
3735 /**
3736  * Program the device to use fixed rate for frame transmit
3737  * This is for debugging/testing only
3738  * once the device start use fixed rate, we need to reload the module
3739  * to being back the normal operation.
3740  */
3741 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3742 				struct iwl_lq_sta *lq_sta)
3743 {
3744 	lq_sta->active_legacy_rate = 0x0FFF;	/* 1 - 54 MBits, includes CCK */
3745 	lq_sta->active_siso_rate   = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
3746 	lq_sta->active_mimo2_rate  = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
3747 
3748 	IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3749 		       lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3750 
3751 	if (lq_sta->pers.dbg_fixed_rate) {
3752 		rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3753 		iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3754 	}
3755 }
3756 
3757 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3758 			const char __user *user_buf, size_t count, loff_t *ppos)
3759 {
3760 	struct iwl_lq_sta *lq_sta = file->private_data;
3761 	struct iwl_mvm *mvm;
3762 	char buf[64];
3763 	size_t buf_size;
3764 	u32 parsed_rate;
3765 
3766 	mvm = lq_sta->pers.drv;
3767 	memset(buf, 0, sizeof(buf));
3768 	buf_size = min(count, sizeof(buf) -  1);
3769 	if (copy_from_user(buf, user_buf, buf_size))
3770 		return -EFAULT;
3771 
3772 	if (sscanf(buf, "%x", &parsed_rate) == 1)
3773 		lq_sta->pers.dbg_fixed_rate = parsed_rate;
3774 	else
3775 		lq_sta->pers.dbg_fixed_rate = 0;
3776 
3777 	rs_program_fix_rate(mvm, lq_sta);
3778 
3779 	return count;
3780 }
3781 
3782 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3783 			char __user *user_buf, size_t count, loff_t *ppos)
3784 {
3785 	char *buff;
3786 	int desc = 0;
3787 	int i = 0;
3788 	ssize_t ret;
3789 	static const size_t bufsz = 2048;
3790 
3791 	struct iwl_lq_sta *lq_sta = file->private_data;
3792 	struct iwl_mvm_sta *mvmsta =
3793 		container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3794 	struct iwl_mvm *mvm;
3795 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3796 	struct rs_rate *rate = &tbl->rate;
3797 	u32 ss_params;
3798 
3799 	mvm = lq_sta->pers.drv;
3800 	buff = kmalloc(bufsz, GFP_KERNEL);
3801 	if (!buff)
3802 		return -ENOMEM;
3803 
3804 	desc += scnprintf(buff + desc, bufsz - desc,
3805 			  "sta_id %d\n", lq_sta->lq.sta_id);
3806 	desc += scnprintf(buff + desc, bufsz - desc,
3807 			  "failed=%d success=%d rate=0%lX\n",
3808 			  lq_sta->total_failed, lq_sta->total_success,
3809 			  lq_sta->active_legacy_rate);
3810 	desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3811 			  lq_sta->pers.dbg_fixed_rate);
3812 	desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3813 	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3814 	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3815 	    (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3816 	desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3817 			  (is_legacy(rate)) ? "legacy" :
3818 			  is_vht(rate) ? "VHT" : "HT");
3819 	if (!is_legacy(rate)) {
3820 		desc += scnprintf(buff + desc, bufsz - desc, " %s",
3821 		   (is_siso(rate)) ? "SISO" : "MIMO2");
3822 		desc += scnprintf(buff + desc, bufsz - desc, " %s",
3823 				(is_ht20(rate)) ? "20MHz" :
3824 				(is_ht40(rate)) ? "40MHz" :
3825 				(is_ht80(rate)) ? "80MHz" :
3826 				(is_ht160(rate)) ? "160MHz" : "BAD BW");
3827 		desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3828 				(rate->sgi) ? "SGI" : "NGI",
3829 				(rate->ldpc) ? "LDPC" : "BCC",
3830 				(lq_sta->is_agg) ? "AGG on" : "",
3831 				(mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3832 	}
3833 	desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3834 			lq_sta->last_rate_n_flags);
3835 	desc += scnprintf(buff + desc, bufsz - desc,
3836 			"general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3837 			lq_sta->lq.flags,
3838 			lq_sta->lq.mimo_delim,
3839 			lq_sta->lq.single_stream_ant_msk,
3840 			lq_sta->lq.dual_stream_ant_msk);
3841 
3842 	desc += scnprintf(buff + desc, bufsz - desc,
3843 			"agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3844 			le16_to_cpu(lq_sta->lq.agg_time_limit),
3845 			lq_sta->lq.agg_disable_start_th,
3846 			lq_sta->lq.agg_frame_cnt_limit);
3847 
3848 	desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3849 			  lq_sta->lq.reduced_tpc);
3850 	ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3851 	desc += scnprintf(buff + desc, bufsz - desc,
3852 			"single stream params: %s%s%s%s\n",
3853 			(ss_params & LQ_SS_PARAMS_VALID) ?
3854 			"VALID" : "INVALID",
3855 			(ss_params & LQ_SS_BFER_ALLOWED) ?
3856 			", BFER" : "",
3857 			(ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3858 			", STBC" : "",
3859 			(ss_params & LQ_SS_FORCE) ?
3860 			", FORCE" : "");
3861 	desc += scnprintf(buff + desc, bufsz - desc,
3862 			"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3863 			lq_sta->lq.initial_rate_index[0],
3864 			lq_sta->lq.initial_rate_index[1],
3865 			lq_sta->lq.initial_rate_index[2],
3866 			lq_sta->lq.initial_rate_index[3]);
3867 
3868 	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3869 		u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3870 
3871 		desc += scnprintf(buff + desc, bufsz - desc,
3872 				  " rate[%d] 0x%X ", i, r);
3873 		desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3874 	}
3875 
3876 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3877 	kfree(buff);
3878 	return ret;
3879 }
3880 
3881 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3882 	.write = rs_sta_dbgfs_scale_table_write,
3883 	.read = rs_sta_dbgfs_scale_table_read,
3884 	.open = simple_open,
3885 	.llseek = default_llseek,
3886 };
3887 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3888 			char __user *user_buf, size_t count, loff_t *ppos)
3889 {
3890 	char *buff;
3891 	int desc = 0;
3892 	int i, j;
3893 	ssize_t ret;
3894 	struct iwl_scale_tbl_info *tbl;
3895 	struct rs_rate *rate;
3896 	struct iwl_lq_sta *lq_sta = file->private_data;
3897 
3898 	buff = kmalloc(1024, GFP_KERNEL);
3899 	if (!buff)
3900 		return -ENOMEM;
3901 
3902 	for (i = 0; i < LQ_SIZE; i++) {
3903 		tbl = &(lq_sta->lq_info[i]);
3904 		rate = &tbl->rate;
3905 		desc += sprintf(buff+desc,
3906 				"%s type=%d SGI=%d BW=%s DUP=0\n"
3907 				"index=%d\n",
3908 				lq_sta->active_tbl == i ? "*" : "x",
3909 				rate->type,
3910 				rate->sgi,
3911 				is_ht20(rate) ? "20MHz" :
3912 				is_ht40(rate) ? "40MHz" :
3913 				is_ht80(rate) ? "80MHz" :
3914 				is_ht160(rate) ? "160MHz" : "ERR",
3915 				rate->index);
3916 		for (j = 0; j < IWL_RATE_COUNT; j++) {
3917 			desc += sprintf(buff+desc,
3918 				"counter=%d success=%d %%=%d\n",
3919 				tbl->win[j].counter,
3920 				tbl->win[j].success_counter,
3921 				tbl->win[j].success_ratio);
3922 		}
3923 	}
3924 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3925 	kfree(buff);
3926 	return ret;
3927 }
3928 
3929 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3930 	.read = rs_sta_dbgfs_stats_table_read,
3931 	.open = simple_open,
3932 	.llseek = default_llseek,
3933 };
3934 
3935 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3936 					      char __user *user_buf,
3937 					      size_t count, loff_t *ppos)
3938 {
3939 	static const char * const column_name[] = {
3940 		[RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3941 		[RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3942 		[RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3943 		[RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3944 		[RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3945 		[RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3946 		[RS_COLUMN_MIMO2] = "MIMO2",
3947 		[RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3948 	};
3949 
3950 	static const char * const rate_name[] = {
3951 		[IWL_RATE_1M_INDEX] = "1M",
3952 		[IWL_RATE_2M_INDEX] = "2M",
3953 		[IWL_RATE_5M_INDEX] = "5.5M",
3954 		[IWL_RATE_11M_INDEX] = "11M",
3955 		[IWL_RATE_6M_INDEX] = "6M|MCS0",
3956 		[IWL_RATE_9M_INDEX] = "9M",
3957 		[IWL_RATE_12M_INDEX] = "12M|MCS1",
3958 		[IWL_RATE_18M_INDEX] = "18M|MCS2",
3959 		[IWL_RATE_24M_INDEX] = "24M|MCS3",
3960 		[IWL_RATE_36M_INDEX] = "36M|MCS4",
3961 		[IWL_RATE_48M_INDEX] = "48M|MCS5",
3962 		[IWL_RATE_54M_INDEX] = "54M|MCS6",
3963 		[IWL_RATE_MCS_7_INDEX] = "MCS7",
3964 		[IWL_RATE_MCS_8_INDEX] = "MCS8",
3965 		[IWL_RATE_MCS_9_INDEX] = "MCS9",
3966 		[IWL_RATE_MCS_10_INDEX] = "MCS10",
3967 		[IWL_RATE_MCS_11_INDEX] = "MCS11",
3968 	};
3969 
3970 	char *buff, *pos, *endpos;
3971 	int col, rate;
3972 	ssize_t ret;
3973 	struct iwl_lq_sta *lq_sta = file->private_data;
3974 	struct rs_rate_stats *stats;
3975 	static const size_t bufsz = 1024;
3976 
3977 	buff = kmalloc(bufsz, GFP_KERNEL);
3978 	if (!buff)
3979 		return -ENOMEM;
3980 
3981 	pos = buff;
3982 	endpos = pos + bufsz;
3983 
3984 	pos += scnprintf(pos, endpos - pos, "COLUMN,");
3985 	for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3986 		pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3987 	pos += scnprintf(pos, endpos - pos, "\n");
3988 
3989 	for (col = 0; col < RS_COLUMN_COUNT; col++) {
3990 		pos += scnprintf(pos, endpos - pos,
3991 				 "%s,", column_name[col]);
3992 
3993 		for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3994 			stats = &(lq_sta->pers.tx_stats[col][rate]);
3995 			pos += scnprintf(pos, endpos - pos,
3996 					 "%llu/%llu,",
3997 					 stats->success,
3998 					 stats->total);
3999 		}
4000 		pos += scnprintf(pos, endpos - pos, "\n");
4001 	}
4002 
4003 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
4004 	kfree(buff);
4005 	return ret;
4006 }
4007 
4008 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
4009 					       const char __user *user_buf,
4010 					       size_t count, loff_t *ppos)
4011 {
4012 	struct iwl_lq_sta *lq_sta = file->private_data;
4013 	memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
4014 
4015 	return count;
4016 }
4017 
4018 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
4019 	.read = rs_sta_dbgfs_drv_tx_stats_read,
4020 	.write = rs_sta_dbgfs_drv_tx_stats_write,
4021 	.open = simple_open,
4022 	.llseek = default_llseek,
4023 };
4024 
4025 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
4026 				       char __user *user_buf,
4027 				       size_t count, loff_t *ppos)
4028 {
4029 	struct iwl_lq_sta *lq_sta = file->private_data;
4030 	char buf[12];
4031 	int bufsz = sizeof(buf);
4032 	int pos = 0;
4033 	static const char * const ss_force_name[] = {
4034 		[RS_SS_FORCE_NONE] = "none",
4035 		[RS_SS_FORCE_STBC] = "stbc",
4036 		[RS_SS_FORCE_BFER] = "bfer",
4037 		[RS_SS_FORCE_SISO] = "siso",
4038 	};
4039 
4040 	pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4041 			 ss_force_name[lq_sta->pers.ss_force]);
4042 	return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4043 }
4044 
4045 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4046 					size_t count, loff_t *ppos)
4047 {
4048 	struct iwl_mvm *mvm = lq_sta->pers.drv;
4049 	int ret = 0;
4050 
4051 	if (!strncmp("none", buf, 4)) {
4052 		lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4053 	} else if (!strncmp("siso", buf, 4)) {
4054 		lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4055 	} else if (!strncmp("stbc", buf, 4)) {
4056 		if (lq_sta->stbc_capable) {
4057 			lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4058 		} else {
4059 			IWL_ERR(mvm,
4060 				"can't force STBC. peer doesn't support\n");
4061 			ret = -EINVAL;
4062 		}
4063 	} else if (!strncmp("bfer", buf, 4)) {
4064 		if (lq_sta->bfer_capable) {
4065 			lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4066 		} else {
4067 			IWL_ERR(mvm,
4068 				"can't force BFER. peer doesn't support\n");
4069 			ret = -EINVAL;
4070 		}
4071 	} else {
4072 		IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4073 		ret = -EINVAL;
4074 	}
4075 	return ret ?: count;
4076 }
4077 
4078 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4079 	_MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4080 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {		\
4081 		if (!debugfs_create_file(#name, mode, parent, lq_sta,	\
4082 					 &iwl_dbgfs_##name##_ops))	\
4083 			goto err;					\
4084 	} while (0)
4085 
4086 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4087 
4088 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4089 				   struct dentry *dir)
4090 {
4091 	struct iwl_lq_sta *lq_sta = priv_sta;
4092 	struct iwl_mvm_sta *mvmsta;
4093 
4094 	mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4095 
4096 	if (!mvmsta->vif)
4097 		return;
4098 
4099 	debugfs_create_file("rate_scale_table", 0600, dir,
4100 			    lq_sta, &rs_sta_dbgfs_scale_table_ops);
4101 	debugfs_create_file("rate_stats_table", 0400, dir,
4102 			    lq_sta, &rs_sta_dbgfs_stats_table_ops);
4103 	debugfs_create_file("drv_tx_stats", 0600, dir,
4104 			    lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4105 	debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4106 			  &lq_sta->tx_agg_tid_en);
4107 	debugfs_create_u8("reduced_tpc", 0600, dir,
4108 			  &lq_sta->pers.dbg_fixed_txp_reduction);
4109 
4110 	MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4111 	return;
4112 err:
4113 	IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4114 }
4115 
4116 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta)
4117 {
4118 }
4119 #endif
4120 
4121 /*
4122  * Initialization of rate scaling information is done by driver after
4123  * the station is added. Since mac80211 calls this function before a
4124  * station is added we ignore it.
4125  */
4126 static void rs_rate_init_ops(void *mvm_r,
4127 			     struct ieee80211_supported_band *sband,
4128 			     struct cfg80211_chan_def *chandef,
4129 			     struct ieee80211_sta *sta, void *mvm_sta)
4130 {
4131 }
4132 
4133 /* ops for rate scaling implemented in the driver */
4134 static const struct rate_control_ops rs_mvm_ops_drv = {
4135 	.name = RS_NAME,
4136 	.tx_status = rs_drv_mac80211_tx_status,
4137 	.get_rate = rs_drv_get_rate,
4138 	.rate_init = rs_rate_init_ops,
4139 	.alloc = rs_alloc,
4140 	.free = rs_free,
4141 	.alloc_sta = rs_drv_alloc_sta,
4142 	.free_sta = rs_free_sta,
4143 	.rate_update = rs_drv_rate_update,
4144 #ifdef CONFIG_MAC80211_DEBUGFS
4145 	.add_sta_debugfs = rs_drv_add_sta_debugfs,
4146 	.remove_sta_debugfs = rs_remove_sta_debugfs,
4147 #endif
4148 	.capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4149 };
4150 
4151 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4152 			  enum nl80211_band band, bool update)
4153 {
4154 	if (iwl_mvm_has_tlc_offload(mvm))
4155 		rs_fw_rate_init(mvm, sta, band, update);
4156 	else
4157 		rs_drv_rate_init(mvm, sta, band, update);
4158 }
4159 
4160 int iwl_mvm_rate_control_register(void)
4161 {
4162 	return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4163 }
4164 
4165 void iwl_mvm_rate_control_unregister(void)
4166 {
4167 	ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4168 }
4169 
4170 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4171 				bool enable)
4172 {
4173 	struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4174 
4175 	lockdep_assert_held(&mvm->mutex);
4176 
4177 	if (enable) {
4178 		if (mvmsta->tx_protection == 0)
4179 			lq->flags |= LQ_FLAG_USE_RTS_MSK;
4180 		mvmsta->tx_protection++;
4181 	} else {
4182 		mvmsta->tx_protection--;
4183 		if (mvmsta->tx_protection == 0)
4184 			lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4185 	}
4186 
4187 	return iwl_mvm_send_lq_cmd(mvm, lq, false);
4188 }
4189 
4190 /**
4191  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4192  * @mvmsta: The station
4193  * @enable: Enable Tx protection?
4194  */
4195 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4196 			  bool enable)
4197 {
4198 	if (iwl_mvm_has_tlc_offload(mvm))
4199 		return rs_fw_tx_protection(mvm, mvmsta, enable);
4200 	else
4201 		return rs_drv_tx_protection(mvm, mvmsta, enable);
4202 }
4203