1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3  *
4  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
5  * Copyright (C) 2019 - 2020 Intel Corporation
6  *****************************************************************************/
7 #include <linux/kernel.h>
8 #include <linux/skbuff.h>
9 #include <linux/slab.h>
10 #include <net/mac80211.h>
11 
12 #include <linux/netdevice.h>
13 #include <linux/etherdevice.h>
14 #include <linux/delay.h>
15 
16 #include <linux/workqueue.h>
17 
18 #include "dev.h"
19 #include "agn.h"
20 
21 #define RS_NAME "iwl-agn-rs"
22 
23 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
24 #define IWL_NUMBER_TRY      1
25 #define IWL_HT_NUMBER_TRY   3
26 
27 #define IWL_RATE_MAX_WINDOW		62	/* # tx in history window */
28 #define IWL_RATE_MIN_FAILURE_TH		6	/* min failures to calc tpt */
29 #define IWL_RATE_MIN_SUCCESS_TH		8	/* min successes to calc tpt */
30 
31 /* max allowed rate miss before sync LQ cmd */
32 #define IWL_MISSED_RATE_MAX		15
33 /* max time to accum history 2 seconds */
34 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
35 
36 static u8 rs_ht_to_legacy[] = {
37 	IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
38 	IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
39 	IWL_RATE_6M_INDEX,
40 	IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
41 	IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
42 	IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
43 	IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
44 };
45 
46 static const u8 ant_toggle_lookup[] = {
47 	/*ANT_NONE -> */ ANT_NONE,
48 	/*ANT_A    -> */ ANT_B,
49 	/*ANT_B    -> */ ANT_C,
50 	/*ANT_AB   -> */ ANT_BC,
51 	/*ANT_C    -> */ ANT_A,
52 	/*ANT_AC   -> */ ANT_AB,
53 	/*ANT_BC   -> */ ANT_AC,
54 	/*ANT_ABC  -> */ ANT_ABC,
55 };
56 
57 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
58 	[IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
59 				    IWL_RATE_SISO_##s##M_PLCP, \
60 				    IWL_RATE_MIMO2_##s##M_PLCP,\
61 				    IWL_RATE_MIMO3_##s##M_PLCP,\
62 				    IWL_RATE_##r##M_IEEE,      \
63 				    IWL_RATE_##ip##M_INDEX,    \
64 				    IWL_RATE_##in##M_INDEX,    \
65 				    IWL_RATE_##rp##M_INDEX,    \
66 				    IWL_RATE_##rn##M_INDEX,    \
67 				    IWL_RATE_##pp##M_INDEX,    \
68 				    IWL_RATE_##np##M_INDEX }
69 
70 /*
71  * Parameter order:
72  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
73  *
74  * If there isn't a valid next or previous rate then INV is used which
75  * maps to IWL_RATE_INVALID
76  *
77  */
78 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
79 	IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
80 	IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
81 	IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
82 	IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
83 	IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
84 	IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
85 	IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
86 	IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
87 	IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
88 	IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
89 	IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
90 	IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
91 	IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
92 	/* FIXME:RS:          ^^    should be INV (legacy) */
93 };
94 
95 static inline u8 rs_extract_rate(u32 rate_n_flags)
96 {
97 	return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
98 }
99 
100 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
101 {
102 	int idx = 0;
103 
104 	/* HT rate format */
105 	if (rate_n_flags & RATE_MCS_HT_MSK) {
106 		idx = rs_extract_rate(rate_n_flags);
107 
108 		if (idx >= IWL_RATE_MIMO3_6M_PLCP)
109 			idx = idx - IWL_RATE_MIMO3_6M_PLCP;
110 		else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
111 			idx = idx - IWL_RATE_MIMO2_6M_PLCP;
112 
113 		idx += IWL_FIRST_OFDM_RATE;
114 		/* skip 9M not supported in ht*/
115 		if (idx >= IWL_RATE_9M_INDEX)
116 			idx += 1;
117 		if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
118 			return idx;
119 
120 	/* legacy rate format, search for match in table */
121 	} else {
122 		for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
123 			if (iwl_rates[idx].plcp ==
124 					rs_extract_rate(rate_n_flags))
125 				return idx;
126 	}
127 
128 	return -1;
129 }
130 
131 static void rs_rate_scale_perform(struct iwl_priv *priv,
132 				   struct sk_buff *skb,
133 				   struct ieee80211_sta *sta,
134 				   struct iwl_lq_sta *lq_sta);
135 static void rs_fill_link_cmd(struct iwl_priv *priv,
136 			     struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
137 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
138 
139 
140 #ifdef CONFIG_MAC80211_DEBUGFS
141 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
142 			     u32 *rate_n_flags, int index);
143 #else
144 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
145 			     u32 *rate_n_flags, int index)
146 {}
147 #endif
148 
149 /*
150  * The following tables contain the expected throughput metrics for all rates
151  *
152  *	1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
153  *
154  * where invalid entries are zeros.
155  *
156  * CCK rates are only valid in legacy table and will only be used in G
157  * (2.4 GHz) band.
158  */
159 
160 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
161 	7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
162 };
163 
164 static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
165 	{0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
166 	{0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
167 	{0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
168 	{0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
169 };
170 
171 static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
172 	{0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
173 	{0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
174 	{0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
175 	{0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
176 };
177 
178 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
179 	{0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
180 	{0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
181 	{0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
182 	{0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
183 };
184 
185 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
186 	{0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
187 	{0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
188 	{0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
189 	{0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
190 };
191 
192 static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
193 	{0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
194 	{0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
195 	{0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
196 	{0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
197 };
198 
199 static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
200 	{0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
201 	{0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
202 	{0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
203 	{0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
204 };
205 
206 /* mbps, mcs */
207 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
208 	{  "1", "BPSK DSSS"},
209 	{  "2", "QPSK DSSS"},
210 	{"5.5", "BPSK CCK"},
211 	{ "11", "QPSK CCK"},
212 	{  "6", "BPSK 1/2"},
213 	{  "9", "BPSK 1/2"},
214 	{ "12", "QPSK 1/2"},
215 	{ "18", "QPSK 3/4"},
216 	{ "24", "16QAM 1/2"},
217 	{ "36", "16QAM 3/4"},
218 	{ "48", "64QAM 2/3"},
219 	{ "54", "64QAM 3/4"},
220 	{ "60", "64QAM 5/6"},
221 };
222 
223 #define MCS_INDEX_PER_STREAM	(8)
224 
225 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
226 {
227 	window->data = 0;
228 	window->success_counter = 0;
229 	window->success_ratio = IWL_INVALID_VALUE;
230 	window->counter = 0;
231 	window->average_tpt = IWL_INVALID_VALUE;
232 	window->stamp = 0;
233 }
234 
235 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
236 {
237 	return (ant_type & valid_antenna) == ant_type;
238 }
239 
240 /*
241  *	removes the old data from the statistics. All data that is older than
242  *	TID_MAX_TIME_DIFF, will be deleted.
243  */
244 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
245 {
246 	/* The oldest age we want to keep */
247 	u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
248 
249 	while (tl->queue_count &&
250 	       (tl->time_stamp < oldest_time)) {
251 		tl->total -= tl->packet_count[tl->head];
252 		tl->packet_count[tl->head] = 0;
253 		tl->time_stamp += TID_QUEUE_CELL_SPACING;
254 		tl->queue_count--;
255 		tl->head++;
256 		if (tl->head >= TID_QUEUE_MAX_SIZE)
257 			tl->head = 0;
258 	}
259 }
260 
261 /*
262  *	increment traffic load value for tid and also remove
263  *	any old values if passed the certain time period
264  */
265 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
266 			   struct ieee80211_hdr *hdr)
267 {
268 	u32 curr_time = jiffies_to_msecs(jiffies);
269 	u32 time_diff;
270 	s32 index;
271 	struct iwl_traffic_load *tl = NULL;
272 	u8 tid;
273 
274 	if (ieee80211_is_data_qos(hdr->frame_control)) {
275 		u8 *qc = ieee80211_get_qos_ctl(hdr);
276 		tid = qc[0] & 0xf;
277 	} else
278 		return IWL_MAX_TID_COUNT;
279 
280 	if (unlikely(tid >= IWL_MAX_TID_COUNT))
281 		return IWL_MAX_TID_COUNT;
282 
283 	tl = &lq_data->load[tid];
284 
285 	curr_time -= curr_time % TID_ROUND_VALUE;
286 
287 	/* Happens only for the first packet. Initialize the data */
288 	if (!(tl->queue_count)) {
289 		tl->total = 1;
290 		tl->time_stamp = curr_time;
291 		tl->queue_count = 1;
292 		tl->head = 0;
293 		tl->packet_count[0] = 1;
294 		return IWL_MAX_TID_COUNT;
295 	}
296 
297 	time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
298 	index = time_diff / TID_QUEUE_CELL_SPACING;
299 
300 	/* The history is too long: remove data that is older than */
301 	/* TID_MAX_TIME_DIFF */
302 	if (index >= TID_QUEUE_MAX_SIZE)
303 		rs_tl_rm_old_stats(tl, curr_time);
304 
305 	index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
306 	tl->packet_count[index] = tl->packet_count[index] + 1;
307 	tl->total = tl->total + 1;
308 
309 	if ((index + 1) > tl->queue_count)
310 		tl->queue_count = index + 1;
311 
312 	return tid;
313 }
314 
315 #ifdef CONFIG_MAC80211_DEBUGFS
316 /*
317  * Program the device to use fixed rate for frame transmit
318  * This is for debugging/testing only
319  * once the device start use fixed rate, we need to reload the module
320  * to being back the normal operation.
321  */
322 static void rs_program_fix_rate(struct iwl_priv *priv,
323 				struct iwl_lq_sta *lq_sta)
324 {
325 	struct iwl_station_priv *sta_priv =
326 		container_of(lq_sta, struct iwl_station_priv, lq_sta);
327 	struct iwl_rxon_context *ctx = sta_priv->ctx;
328 
329 	lq_sta->active_legacy_rate = 0x0FFF;	/* 1 - 54 MBits, includes CCK */
330 	lq_sta->active_siso_rate   = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
331 	lq_sta->active_mimo2_rate  = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
332 	lq_sta->active_mimo3_rate  = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
333 
334 	IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
335 		lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
336 
337 	if (lq_sta->dbg_fixed_rate) {
338 		rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
339 		iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
340 				false);
341 	}
342 }
343 #endif
344 
345 /*
346 	get the traffic load value for tid
347 */
348 static void rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
349 {
350 	u32 curr_time = jiffies_to_msecs(jiffies);
351 	u32 time_diff;
352 	s32 index;
353 	struct iwl_traffic_load *tl = NULL;
354 
355 	if (tid >= IWL_MAX_TID_COUNT)
356 		return;
357 
358 	tl = &(lq_data->load[tid]);
359 
360 	curr_time -= curr_time % TID_ROUND_VALUE;
361 
362 	if (!(tl->queue_count))
363 		return;
364 
365 	time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
366 	index = time_diff / TID_QUEUE_CELL_SPACING;
367 
368 	/* The history is too long: remove data that is older than */
369 	/* TID_MAX_TIME_DIFF */
370 	if (index >= TID_QUEUE_MAX_SIZE)
371 		rs_tl_rm_old_stats(tl, curr_time);
372 }
373 
374 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
375 				      struct iwl_lq_sta *lq_data, u8 tid,
376 				      struct ieee80211_sta *sta)
377 {
378 	int ret = -EAGAIN;
379 
380 	/*
381 	 * Don't create TX aggregation sessions when in high
382 	 * BT traffic, as they would just be disrupted by BT.
383 	 */
384 	if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
385 		IWL_DEBUG_COEX(priv,
386 			       "BT traffic (%d), no aggregation allowed\n",
387 			       priv->bt_traffic_load);
388 		return ret;
389 	}
390 
391 	rs_tl_get_load(lq_data, tid);
392 
393 	IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
394 			sta->addr, tid);
395 	ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
396 	if (ret == -EAGAIN) {
397 		/*
398 		 * driver and mac80211 is out of sync
399 		 * this might be cause by reloading firmware
400 		 * stop the tx ba session here
401 		 */
402 		IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
403 			tid);
404 		ieee80211_stop_tx_ba_session(sta, tid);
405 	}
406 	return ret;
407 }
408 
409 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
410 			      struct iwl_lq_sta *lq_data,
411 			      struct ieee80211_sta *sta)
412 {
413 	if (tid < IWL_MAX_TID_COUNT)
414 		rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
415 	else
416 		IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
417 			tid, IWL_MAX_TID_COUNT);
418 }
419 
420 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
421 {
422 	return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
423 	       !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
424 	       !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
425 }
426 
427 /*
428  * Static function to get the expected throughput from an iwl_scale_tbl_info
429  * that wraps a NULL pointer check
430  */
431 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
432 {
433 	if (tbl->expected_tpt)
434 		return tbl->expected_tpt[rs_index];
435 	return 0;
436 }
437 
438 /*
439  * rs_collect_tx_data - Update the success/failure sliding window
440  *
441  * We keep a sliding window of the last 62 packets transmitted
442  * at this rate.  window->data contains the bitmask of successful
443  * packets.
444  */
445 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
446 			      int scale_index, int attempts, int successes)
447 {
448 	struct iwl_rate_scale_data *window = NULL;
449 	static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
450 	s32 fail_count, tpt;
451 
452 	if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
453 		return -EINVAL;
454 
455 	/* Select window for current tx bit rate */
456 	window = &(tbl->win[scale_index]);
457 
458 	/* Get expected throughput */
459 	tpt = get_expected_tpt(tbl, scale_index);
460 
461 	/*
462 	 * Keep track of only the latest 62 tx frame attempts in this rate's
463 	 * history window; anything older isn't really relevant any more.
464 	 * If we have filled up the sliding window, drop the oldest attempt;
465 	 * if the oldest attempt (highest bit in bitmap) shows "success",
466 	 * subtract "1" from the success counter (this is the main reason
467 	 * we keep these bitmaps!).
468 	 */
469 	while (attempts > 0) {
470 		if (window->counter >= IWL_RATE_MAX_WINDOW) {
471 
472 			/* remove earliest */
473 			window->counter = IWL_RATE_MAX_WINDOW - 1;
474 
475 			if (window->data & mask) {
476 				window->data &= ~mask;
477 				window->success_counter--;
478 			}
479 		}
480 
481 		/* Increment frames-attempted counter */
482 		window->counter++;
483 
484 		/* Shift bitmap by one frame to throw away oldest history */
485 		window->data <<= 1;
486 
487 		/* Mark the most recent #successes attempts as successful */
488 		if (successes > 0) {
489 			window->success_counter++;
490 			window->data |= 0x1;
491 			successes--;
492 		}
493 
494 		attempts--;
495 	}
496 
497 	/* Calculate current success ratio, avoid divide-by-0! */
498 	if (window->counter > 0)
499 		window->success_ratio = 128 * (100 * window->success_counter)
500 					/ window->counter;
501 	else
502 		window->success_ratio = IWL_INVALID_VALUE;
503 
504 	fail_count = window->counter - window->success_counter;
505 
506 	/* Calculate average throughput, if we have enough history. */
507 	if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
508 	    (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
509 		window->average_tpt = (window->success_ratio * tpt + 64) / 128;
510 	else
511 		window->average_tpt = IWL_INVALID_VALUE;
512 
513 	/* Tag this window as having been updated */
514 	window->stamp = jiffies;
515 
516 	return 0;
517 }
518 
519 /*
520  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
521  */
522 /* FIXME:RS:remove this function and put the flags statically in the table */
523 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
524 				 struct iwl_scale_tbl_info *tbl,
525 				 int index, u8 use_green)
526 {
527 	u32 rate_n_flags = 0;
528 
529 	if (is_legacy(tbl->lq_type)) {
530 		rate_n_flags = iwl_rates[index].plcp;
531 		if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
532 			rate_n_flags |= RATE_MCS_CCK_MSK;
533 
534 	} else if (is_Ht(tbl->lq_type)) {
535 		if (index > IWL_LAST_OFDM_RATE) {
536 			IWL_ERR(priv, "Invalid HT rate index %d\n", index);
537 			index = IWL_LAST_OFDM_RATE;
538 		}
539 		rate_n_flags = RATE_MCS_HT_MSK;
540 
541 		if (is_siso(tbl->lq_type))
542 			rate_n_flags |=	iwl_rates[index].plcp_siso;
543 		else if (is_mimo2(tbl->lq_type))
544 			rate_n_flags |=	iwl_rates[index].plcp_mimo2;
545 		else
546 			rate_n_flags |=	iwl_rates[index].plcp_mimo3;
547 	} else {
548 		IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
549 	}
550 
551 	rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
552 						     RATE_MCS_ANT_ABC_MSK);
553 
554 	if (is_Ht(tbl->lq_type)) {
555 		if (tbl->is_ht40) {
556 			if (tbl->is_dup)
557 				rate_n_flags |= RATE_MCS_DUP_MSK;
558 			else
559 				rate_n_flags |= RATE_MCS_HT40_MSK;
560 		}
561 		if (tbl->is_SGI)
562 			rate_n_flags |= RATE_MCS_SGI_MSK;
563 
564 		if (use_green) {
565 			rate_n_flags |= RATE_MCS_GF_MSK;
566 			if (is_siso(tbl->lq_type) && tbl->is_SGI) {
567 				rate_n_flags &= ~RATE_MCS_SGI_MSK;
568 				IWL_ERR(priv, "GF was set with SGI:SISO\n");
569 			}
570 		}
571 	}
572 	return rate_n_flags;
573 }
574 
575 /*
576  * Interpret uCode API's rate_n_flags format,
577  * fill "search" or "active" tx mode table.
578  */
579 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
580 				    enum nl80211_band band,
581 				    struct iwl_scale_tbl_info *tbl,
582 				    int *rate_idx)
583 {
584 	u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
585 	u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
586 	u8 mcs;
587 
588 	memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
589 	*rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
590 
591 	if (*rate_idx  == IWL_RATE_INVALID) {
592 		*rate_idx = -1;
593 		return -EINVAL;
594 	}
595 	tbl->is_SGI = 0;	/* default legacy setup */
596 	tbl->is_ht40 = 0;
597 	tbl->is_dup = 0;
598 	tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
599 	tbl->lq_type = LQ_NONE;
600 	tbl->max_search = IWL_MAX_SEARCH;
601 
602 	/* legacy rate format */
603 	if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
604 		if (num_of_ant == 1) {
605 			if (band == NL80211_BAND_5GHZ)
606 				tbl->lq_type = LQ_A;
607 			else
608 				tbl->lq_type = LQ_G;
609 		}
610 	/* HT rate format */
611 	} else {
612 		if (rate_n_flags & RATE_MCS_SGI_MSK)
613 			tbl->is_SGI = 1;
614 
615 		if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
616 		    (rate_n_flags & RATE_MCS_DUP_MSK))
617 			tbl->is_ht40 = 1;
618 
619 		if (rate_n_flags & RATE_MCS_DUP_MSK)
620 			tbl->is_dup = 1;
621 
622 		mcs = rs_extract_rate(rate_n_flags);
623 
624 		/* SISO */
625 		if (mcs <= IWL_RATE_SISO_60M_PLCP) {
626 			if (num_of_ant == 1)
627 				tbl->lq_type = LQ_SISO; /*else NONE*/
628 		/* MIMO2 */
629 		} else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
630 			if (num_of_ant == 2)
631 				tbl->lq_type = LQ_MIMO2;
632 		/* MIMO3 */
633 		} else {
634 			if (num_of_ant == 3) {
635 				tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
636 				tbl->lq_type = LQ_MIMO3;
637 			}
638 		}
639 	}
640 	return 0;
641 }
642 
643 /* switch to another antenna/antennas and return 1 */
644 /* if no other valid antenna found, return 0 */
645 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
646 			     struct iwl_scale_tbl_info *tbl)
647 {
648 	u8 new_ant_type;
649 
650 	if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
651 		return 0;
652 
653 	if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
654 		return 0;
655 
656 	new_ant_type = ant_toggle_lookup[tbl->ant_type];
657 
658 	while ((new_ant_type != tbl->ant_type) &&
659 	       !rs_is_valid_ant(valid_ant, new_ant_type))
660 		new_ant_type = ant_toggle_lookup[new_ant_type];
661 
662 	if (new_ant_type == tbl->ant_type)
663 		return 0;
664 
665 	tbl->ant_type = new_ant_type;
666 	*rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
667 	*rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
668 	return 1;
669 }
670 
671 /*
672  * Green-field mode is valid if the station supports it and
673  * there are no non-GF stations present in the BSS.
674  */
675 static bool rs_use_green(struct ieee80211_sta *sta)
676 {
677 	/*
678 	 * There's a bug somewhere in this code that causes the
679 	 * scaling to get stuck because GF+SGI can't be combined
680 	 * in SISO rates. Until we find that bug, disable GF, it
681 	 * has only limited benefit and we still interoperate with
682 	 * GF APs since we can always receive GF transmissions.
683 	 */
684 	return false;
685 }
686 
687 /*
688  * rs_get_supported_rates - get the available rates
689  *
690  * if management frame or broadcast frame only return
691  * basic available rates.
692  *
693  */
694 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
695 				  struct ieee80211_hdr *hdr,
696 				  enum iwl_table_type rate_type)
697 {
698 	if (is_legacy(rate_type)) {
699 		return lq_sta->active_legacy_rate;
700 	} else {
701 		if (is_siso(rate_type))
702 			return lq_sta->active_siso_rate;
703 		else if (is_mimo2(rate_type))
704 			return lq_sta->active_mimo2_rate;
705 		else
706 			return lq_sta->active_mimo3_rate;
707 	}
708 }
709 
710 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
711 				int rate_type)
712 {
713 	u8 high = IWL_RATE_INVALID;
714 	u8 low = IWL_RATE_INVALID;
715 
716 	/* 802.11A or ht walks to the next literal adjacent rate in
717 	 * the rate table */
718 	if (is_a_band(rate_type) || !is_legacy(rate_type)) {
719 		int i;
720 		u32 mask;
721 
722 		/* Find the previous rate that is in the rate mask */
723 		i = index - 1;
724 		if (i >= 0)
725 			mask = BIT(i);
726 
727 		for (; i >= 0; i--, mask >>= 1) {
728 			if (rate_mask & mask) {
729 				low = i;
730 				break;
731 			}
732 		}
733 
734 		/* Find the next rate that is in the rate mask */
735 		i = index + 1;
736 		for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
737 			if (rate_mask & mask) {
738 				high = i;
739 				break;
740 			}
741 		}
742 
743 		return (high << 8) | low;
744 	}
745 
746 	low = index;
747 	while (low != IWL_RATE_INVALID) {
748 		low = iwl_rates[low].prev_rs;
749 		if (low == IWL_RATE_INVALID)
750 			break;
751 		if (rate_mask & (1 << low))
752 			break;
753 		IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
754 	}
755 
756 	high = index;
757 	while (high != IWL_RATE_INVALID) {
758 		high = iwl_rates[high].next_rs;
759 		if (high == IWL_RATE_INVALID)
760 			break;
761 		if (rate_mask & (1 << high))
762 			break;
763 		IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
764 	}
765 
766 	return (high << 8) | low;
767 }
768 
769 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
770 			     struct iwl_scale_tbl_info *tbl,
771 			     u8 scale_index, u8 ht_possible)
772 {
773 	s32 low;
774 	u16 rate_mask;
775 	u16 high_low;
776 	u8 switch_to_legacy = 0;
777 	u8 is_green = lq_sta->is_green;
778 	struct iwl_priv *priv = lq_sta->drv;
779 
780 	/* check if we need to switch from HT to legacy rates.
781 	 * assumption is that mandatory rates (1Mbps or 6Mbps)
782 	 * are always supported (spec demand) */
783 	if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
784 		switch_to_legacy = 1;
785 		scale_index = rs_ht_to_legacy[scale_index];
786 		if (lq_sta->band == NL80211_BAND_5GHZ)
787 			tbl->lq_type = LQ_A;
788 		else
789 			tbl->lq_type = LQ_G;
790 
791 		if (num_of_ant(tbl->ant_type) > 1)
792 			tbl->ant_type =
793 			    first_antenna(priv->nvm_data->valid_tx_ant);
794 
795 		tbl->is_ht40 = 0;
796 		tbl->is_SGI = 0;
797 		tbl->max_search = IWL_MAX_SEARCH;
798 	}
799 
800 	rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
801 
802 	/* Mask with station rate restriction */
803 	if (is_legacy(tbl->lq_type)) {
804 		/* supp_rates has no CCK bits in A mode */
805 		if (lq_sta->band == NL80211_BAND_5GHZ)
806 			rate_mask  = (u16)(rate_mask &
807 			   (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
808 		else
809 			rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
810 	}
811 
812 	/* If we switched from HT to legacy, check current rate */
813 	if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
814 		low = scale_index;
815 		goto out;
816 	}
817 
818 	high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
819 					tbl->lq_type);
820 	low = high_low & 0xff;
821 
822 	if (low == IWL_RATE_INVALID)
823 		low = scale_index;
824 
825 out:
826 	return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
827 }
828 
829 /*
830  * Simple function to compare two rate scale table types
831  */
832 static bool table_type_matches(struct iwl_scale_tbl_info *a,
833 			       struct iwl_scale_tbl_info *b)
834 {
835 	return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
836 		(a->is_SGI == b->is_SGI);
837 }
838 
839 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
840 			    struct iwl_lq_sta *lq_sta)
841 {
842 	struct iwl_scale_tbl_info *tbl;
843 	bool full_concurrent = priv->bt_full_concurrent;
844 
845 	if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
846 	    (priv->bt_full_concurrent != full_concurrent)) {
847 		priv->bt_full_concurrent = full_concurrent;
848 		priv->last_bt_traffic_load = priv->bt_traffic_load;
849 
850 		/* Update uCode's rate table. */
851 		tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
852 		rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
853 		iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
854 
855 		queue_work(priv->workqueue, &priv->bt_full_concurrency);
856 	}
857 }
858 
859 /*
860  * mac80211 sends us Tx status
861  */
862 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
863 			 struct ieee80211_sta *sta, void *priv_sta,
864 			 struct sk_buff *skb)
865 {
866 	int legacy_success;
867 	int retries;
868 	int rs_index, mac_index, i;
869 	struct iwl_lq_sta *lq_sta = priv_sta;
870 	struct iwl_link_quality_cmd *table;
871 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
872 	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
873 	struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
874 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
875 	enum mac80211_rate_control_flags mac_flags;
876 	u32 tx_rate;
877 	struct iwl_scale_tbl_info tbl_type;
878 	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
879 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
880 	struct iwl_rxon_context *ctx = sta_priv->ctx;
881 
882 	IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
883 
884 	/* Treat uninitialized rate scaling data same as non-existing. */
885 	if (!lq_sta) {
886 		IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
887 		return;
888 	} else if (!lq_sta->drv) {
889 		IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
890 		return;
891 	}
892 
893 	if (!ieee80211_is_data(hdr->frame_control) ||
894 	    info->flags & IEEE80211_TX_CTL_NO_ACK)
895 		return;
896 
897 	/* This packet was aggregated but doesn't carry status info */
898 	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
899 	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
900 		return;
901 
902 	/*
903 	 * Ignore this Tx frame response if its initial rate doesn't match
904 	 * that of latest Link Quality command.  There may be stragglers
905 	 * from a previous Link Quality command, but we're no longer interested
906 	 * in those; they're either from the "active" mode while we're trying
907 	 * to check "search" mode, or a prior "search" mode after we've moved
908 	 * to a new "search" mode (which might become the new "active" mode).
909 	 */
910 	table = &lq_sta->lq;
911 	tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
912 	rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
913 	if (priv->band == NL80211_BAND_5GHZ)
914 		rs_index -= IWL_FIRST_OFDM_RATE;
915 	mac_flags = info->status.rates[0].flags;
916 	mac_index = info->status.rates[0].idx;
917 	/* For HT packets, map MCS to PLCP */
918 	if (mac_flags & IEEE80211_TX_RC_MCS) {
919 		mac_index &= RATE_MCS_CODE_MSK;	/* Remove # of streams */
920 		if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
921 			mac_index++;
922 		/*
923 		 * mac80211 HT index is always zero-indexed; we need to move
924 		 * HT OFDM rates after CCK rates in 2.4 GHz band
925 		 */
926 		if (priv->band == NL80211_BAND_2GHZ)
927 			mac_index += IWL_FIRST_OFDM_RATE;
928 	}
929 	/* Here we actually compare this rate to the latest LQ command */
930 	if ((mac_index < 0) ||
931 	    (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
932 	    (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
933 	    (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
934 	    (tbl_type.ant_type != info->status.antenna) ||
935 	    (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
936 	    (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
937 	    (rs_index != mac_index)) {
938 		IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
939 		/*
940 		 * Since rates mis-match, the last LQ command may have failed.
941 		 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
942 		 * ... driver.
943 		 */
944 		lq_sta->missed_rate_counter++;
945 		if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
946 			lq_sta->missed_rate_counter = 0;
947 			iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
948 		}
949 		/* Regardless, ignore this status info for outdated rate */
950 		return;
951 	} else
952 		/* Rate did match, so reset the missed_rate_counter */
953 		lq_sta->missed_rate_counter = 0;
954 
955 	/* Figure out if rate scale algorithm is in active or search table */
956 	if (table_type_matches(&tbl_type,
957 				&(lq_sta->lq_info[lq_sta->active_tbl]))) {
958 		curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
959 		other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
960 	} else if (table_type_matches(&tbl_type,
961 				&lq_sta->lq_info[1 - lq_sta->active_tbl])) {
962 		curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
963 		other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
964 	} else {
965 		IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
966 		tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
967 		IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
968 			tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
969 		tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
970 		IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
971 			tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
972 		IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
973 			tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
974 		/*
975 		 * no matching table found, let's by-pass the data collection
976 		 * and continue to perform rate scale to find the rate table
977 		 */
978 		rs_stay_in_table(lq_sta, true);
979 		goto done;
980 	}
981 
982 	/*
983 	 * Updating the frame history depends on whether packets were
984 	 * aggregated.
985 	 *
986 	 * For aggregation, all packets were transmitted at the same rate, the
987 	 * first index into rate scale table.
988 	 */
989 	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
990 		tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
991 		rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
992 				&rs_index);
993 		rs_collect_tx_data(curr_tbl, rs_index,
994 				   info->status.ampdu_len,
995 				   info->status.ampdu_ack_len);
996 
997 		/* Update success/fail counts if not searching for new mode */
998 		if (lq_sta->stay_in_tbl) {
999 			lq_sta->total_success += info->status.ampdu_ack_len;
1000 			lq_sta->total_failed += (info->status.ampdu_len -
1001 					info->status.ampdu_ack_len);
1002 		}
1003 	} else {
1004 	/*
1005 	 * For legacy, update frame history with for each Tx retry.
1006 	 */
1007 		retries = info->status.rates[0].count - 1;
1008 		/* HW doesn't send more than 15 retries */
1009 		retries = min(retries, 15);
1010 
1011 		/* The last transmission may have been successful */
1012 		legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1013 		/* Collect data for each rate used during failed TX attempts */
1014 		for (i = 0; i <= retries; ++i) {
1015 			tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1016 			rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1017 					&tbl_type, &rs_index);
1018 			/*
1019 			 * Only collect stats if retried rate is in the same RS
1020 			 * table as active/search.
1021 			 */
1022 			if (table_type_matches(&tbl_type, curr_tbl))
1023 				tmp_tbl = curr_tbl;
1024 			else if (table_type_matches(&tbl_type, other_tbl))
1025 				tmp_tbl = other_tbl;
1026 			else
1027 				continue;
1028 			rs_collect_tx_data(tmp_tbl, rs_index, 1,
1029 					   i < retries ? 0 : legacy_success);
1030 		}
1031 
1032 		/* Update success/fail counts if not searching for new mode */
1033 		if (lq_sta->stay_in_tbl) {
1034 			lq_sta->total_success += legacy_success;
1035 			lq_sta->total_failed += retries + (1 - legacy_success);
1036 		}
1037 	}
1038 	/* The last TX rate is cached in lq_sta; it's set in if/else above */
1039 	lq_sta->last_rate_n_flags = tx_rate;
1040 done:
1041 	/* See if there's a better rate or modulation mode to try. */
1042 	if (sta && sta->deflink.supp_rates[sband->band])
1043 		rs_rate_scale_perform(priv, skb, sta, lq_sta);
1044 
1045 	if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
1046 		rs_bt_update_lq(priv, ctx, lq_sta);
1047 }
1048 
1049 /*
1050  * Begin a period of staying with a selected modulation mode.
1051  * Set "stay_in_tbl" flag to prevent any mode switches.
1052  * Set frame tx success limits according to legacy vs. high-throughput,
1053  * and reset overall (spanning all rates) tx success history statistics.
1054  * These control how long we stay using same modulation mode before
1055  * searching for a new mode.
1056  */
1057 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1058 				 struct iwl_lq_sta *lq_sta)
1059 {
1060 	IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1061 	lq_sta->stay_in_tbl = 1;	/* only place this gets set */
1062 	if (is_legacy) {
1063 		lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1064 		lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1065 		lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1066 	} else {
1067 		lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1068 		lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1069 		lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1070 	}
1071 	lq_sta->table_count = 0;
1072 	lq_sta->total_failed = 0;
1073 	lq_sta->total_success = 0;
1074 	lq_sta->flush_timer = jiffies;
1075 	lq_sta->action_counter = 0;
1076 }
1077 
1078 /*
1079  * Find correct throughput table for given mode of modulation
1080  */
1081 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1082 				      struct iwl_scale_tbl_info *tbl)
1083 {
1084 	/* Used to choose among HT tables */
1085 	const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1086 
1087 	/* Check for invalid LQ type */
1088 	if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1089 		tbl->expected_tpt = expected_tpt_legacy;
1090 		return;
1091 	}
1092 
1093 	/* Legacy rates have only one table */
1094 	if (is_legacy(tbl->lq_type)) {
1095 		tbl->expected_tpt = expected_tpt_legacy;
1096 		return;
1097 	}
1098 
1099 	/* Choose among many HT tables depending on number of streams
1100 	 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1101 	 * status */
1102 	if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1103 		ht_tbl_pointer = expected_tpt_siso20MHz;
1104 	else if (is_siso(tbl->lq_type))
1105 		ht_tbl_pointer = expected_tpt_siso40MHz;
1106 	else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1107 		ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1108 	else if (is_mimo2(tbl->lq_type))
1109 		ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1110 	else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1111 		ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1112 	else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1113 		ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1114 
1115 	if (!tbl->is_SGI && !lq_sta->is_agg)		/* Normal */
1116 		tbl->expected_tpt = ht_tbl_pointer[0];
1117 	else if (tbl->is_SGI && !lq_sta->is_agg)	/* SGI */
1118 		tbl->expected_tpt = ht_tbl_pointer[1];
1119 	else if (!tbl->is_SGI && lq_sta->is_agg)	/* AGG */
1120 		tbl->expected_tpt = ht_tbl_pointer[2];
1121 	else						/* AGG+SGI */
1122 		tbl->expected_tpt = ht_tbl_pointer[3];
1123 }
1124 
1125 /*
1126  * Find starting rate for new "search" high-throughput mode of modulation.
1127  * Goal is to find lowest expected rate (under perfect conditions) that is
1128  * above the current measured throughput of "active" mode, to give new mode
1129  * a fair chance to prove itself without too many challenges.
1130  *
1131  * This gets called when transitioning to more aggressive modulation
1132  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1133  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1134  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1135  * bit rate will typically need to increase, but not if performance was bad.
1136  */
1137 static s32 rs_get_best_rate(struct iwl_priv *priv,
1138 			    struct iwl_lq_sta *lq_sta,
1139 			    struct iwl_scale_tbl_info *tbl,	/* "search" */
1140 			    u16 rate_mask, s8 index)
1141 {
1142 	/* "active" values */
1143 	struct iwl_scale_tbl_info *active_tbl =
1144 	    &(lq_sta->lq_info[lq_sta->active_tbl]);
1145 	s32 active_sr = active_tbl->win[index].success_ratio;
1146 	s32 active_tpt = active_tbl->expected_tpt[index];
1147 	/* expected "search" throughput */
1148 	const u16 *tpt_tbl = tbl->expected_tpt;
1149 
1150 	s32 new_rate, high, low, start_hi;
1151 	u16 high_low;
1152 	s8 rate = index;
1153 
1154 	new_rate = high = low = start_hi = IWL_RATE_INVALID;
1155 
1156 	for (; ;) {
1157 		high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1158 						tbl->lq_type);
1159 
1160 		low = high_low & 0xff;
1161 		high = (high_low >> 8) & 0xff;
1162 
1163 		/*
1164 		 * Lower the "search" bit rate, to give new "search" mode
1165 		 * approximately the same throughput as "active" if:
1166 		 *
1167 		 * 1) "Active" mode has been working modestly well (but not
1168 		 *    great), and expected "search" throughput (under perfect
1169 		 *    conditions) at candidate rate is above the actual
1170 		 *    measured "active" throughput (but less than expected
1171 		 *    "active" throughput under perfect conditions).
1172 		 * OR
1173 		 * 2) "Active" mode has been working perfectly or very well
1174 		 *    and expected "search" throughput (under perfect
1175 		 *    conditions) at candidate rate is above expected
1176 		 *    "active" throughput (under perfect conditions).
1177 		 */
1178 		if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1179 		     ((active_sr > IWL_RATE_DECREASE_TH) &&
1180 		      (active_sr <= IWL_RATE_HIGH_TH) &&
1181 		      (tpt_tbl[rate] <= active_tpt))) ||
1182 		    ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1183 		     (tpt_tbl[rate] > active_tpt))) {
1184 
1185 			/* (2nd or later pass)
1186 			 * If we've already tried to raise the rate, and are
1187 			 * now trying to lower it, use the higher rate. */
1188 			if (start_hi != IWL_RATE_INVALID) {
1189 				new_rate = start_hi;
1190 				break;
1191 			}
1192 
1193 			new_rate = rate;
1194 
1195 			/* Loop again with lower rate */
1196 			if (low != IWL_RATE_INVALID)
1197 				rate = low;
1198 
1199 			/* Lower rate not available, use the original */
1200 			else
1201 				break;
1202 
1203 		/* Else try to raise the "search" rate to match "active" */
1204 		} else {
1205 			/* (2nd or later pass)
1206 			 * If we've already tried to lower the rate, and are
1207 			 * now trying to raise it, use the lower rate. */
1208 			if (new_rate != IWL_RATE_INVALID)
1209 				break;
1210 
1211 			/* Loop again with higher rate */
1212 			else if (high != IWL_RATE_INVALID) {
1213 				start_hi = high;
1214 				rate = high;
1215 
1216 			/* Higher rate not available, use the original */
1217 			} else {
1218 				new_rate = rate;
1219 				break;
1220 			}
1221 		}
1222 	}
1223 
1224 	return new_rate;
1225 }
1226 
1227 /*
1228  * Set up search table for MIMO2
1229  */
1230 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1231 			     struct iwl_lq_sta *lq_sta,
1232 			     struct ieee80211_conf *conf,
1233 			     struct ieee80211_sta *sta,
1234 			     struct iwl_scale_tbl_info *tbl, int index)
1235 {
1236 	u16 rate_mask;
1237 	s32 rate;
1238 	s8 is_green = lq_sta->is_green;
1239 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1240 	struct iwl_rxon_context *ctx = sta_priv->ctx;
1241 
1242 	if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1243 		return -1;
1244 
1245 	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1246 		return -1;
1247 
1248 	/* Need both Tx chains/antennas to support MIMO */
1249 	if (priv->hw_params.tx_chains_num < 2)
1250 		return -1;
1251 
1252 	IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1253 
1254 	tbl->lq_type = LQ_MIMO2;
1255 	tbl->is_dup = lq_sta->is_dup;
1256 	tbl->action = 0;
1257 	tbl->max_search = IWL_MAX_SEARCH;
1258 	rate_mask = lq_sta->active_mimo2_rate;
1259 
1260 	if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1261 		tbl->is_ht40 = 1;
1262 	else
1263 		tbl->is_ht40 = 0;
1264 
1265 	rs_set_expected_tpt_table(lq_sta, tbl);
1266 
1267 	rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1268 
1269 	IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1270 	if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1271 		IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1272 						rate, rate_mask);
1273 		return -1;
1274 	}
1275 	tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1276 
1277 	IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1278 		     tbl->current_rate, is_green);
1279 	return 0;
1280 }
1281 
1282 /*
1283  * Set up search table for MIMO3
1284  */
1285 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1286 			     struct iwl_lq_sta *lq_sta,
1287 			     struct ieee80211_conf *conf,
1288 			     struct ieee80211_sta *sta,
1289 			     struct iwl_scale_tbl_info *tbl, int index)
1290 {
1291 	u16 rate_mask;
1292 	s32 rate;
1293 	s8 is_green = lq_sta->is_green;
1294 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1295 	struct iwl_rxon_context *ctx = sta_priv->ctx;
1296 
1297 	if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1298 		return -1;
1299 
1300 	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1301 		return -1;
1302 
1303 	/* Need both Tx chains/antennas to support MIMO */
1304 	if (priv->hw_params.tx_chains_num < 3)
1305 		return -1;
1306 
1307 	IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1308 
1309 	tbl->lq_type = LQ_MIMO3;
1310 	tbl->is_dup = lq_sta->is_dup;
1311 	tbl->action = 0;
1312 	tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1313 	rate_mask = lq_sta->active_mimo3_rate;
1314 
1315 	if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1316 		tbl->is_ht40 = 1;
1317 	else
1318 		tbl->is_ht40 = 0;
1319 
1320 	rs_set_expected_tpt_table(lq_sta, tbl);
1321 
1322 	rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1323 
1324 	IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1325 		rate, rate_mask);
1326 	if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1327 		IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1328 						rate, rate_mask);
1329 		return -1;
1330 	}
1331 	tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1332 
1333 	IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1334 		     tbl->current_rate, is_green);
1335 	return 0;
1336 }
1337 
1338 /*
1339  * Set up search table for SISO
1340  */
1341 static int rs_switch_to_siso(struct iwl_priv *priv,
1342 			     struct iwl_lq_sta *lq_sta,
1343 			     struct ieee80211_conf *conf,
1344 			     struct ieee80211_sta *sta,
1345 			     struct iwl_scale_tbl_info *tbl, int index)
1346 {
1347 	u16 rate_mask;
1348 	u8 is_green = lq_sta->is_green;
1349 	s32 rate;
1350 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1351 	struct iwl_rxon_context *ctx = sta_priv->ctx;
1352 
1353 	if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1354 		return -1;
1355 
1356 	IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1357 
1358 	tbl->is_dup = lq_sta->is_dup;
1359 	tbl->lq_type = LQ_SISO;
1360 	tbl->action = 0;
1361 	tbl->max_search = IWL_MAX_SEARCH;
1362 	rate_mask = lq_sta->active_siso_rate;
1363 
1364 	if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1365 		tbl->is_ht40 = 1;
1366 	else
1367 		tbl->is_ht40 = 0;
1368 
1369 	if (is_green)
1370 		tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1371 
1372 	rs_set_expected_tpt_table(lq_sta, tbl);
1373 	rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1374 
1375 	IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1376 	if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1377 		IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1378 			     rate, rate_mask);
1379 		return -1;
1380 	}
1381 	tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1382 	IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1383 		     tbl->current_rate, is_green);
1384 	return 0;
1385 }
1386 
1387 /*
1388  * Try to switch to new modulation mode from legacy
1389  */
1390 static void rs_move_legacy_other(struct iwl_priv *priv,
1391 				 struct iwl_lq_sta *lq_sta,
1392 				 struct ieee80211_conf *conf,
1393 				 struct ieee80211_sta *sta,
1394 				 int index)
1395 {
1396 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1397 	struct iwl_scale_tbl_info *search_tbl =
1398 				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1399 	struct iwl_rate_scale_data *window = &(tbl->win[index]);
1400 	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1401 		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1402 	u8 start_action;
1403 	u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1404 	u8 tx_chains_num = priv->hw_params.tx_chains_num;
1405 	int ret = 0;
1406 	u8 update_search_tbl_counter = 0;
1407 
1408 	switch (priv->bt_traffic_load) {
1409 	case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1410 		/* nothing */
1411 		break;
1412 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1413 		/* avoid antenna B unless MIMO */
1414 		if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1415 			tbl->action = IWL_LEGACY_SWITCH_SISO;
1416 		break;
1417 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1418 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1419 		/* avoid antenna B and MIMO */
1420 		valid_tx_ant =
1421 			first_antenna(priv->nvm_data->valid_tx_ant);
1422 		if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1423 		    tbl->action != IWL_LEGACY_SWITCH_SISO)
1424 			tbl->action = IWL_LEGACY_SWITCH_SISO;
1425 		break;
1426 	default:
1427 		IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1428 		break;
1429 	}
1430 
1431 	if (!iwl_ht_enabled(priv))
1432 		/* stay in Legacy */
1433 		tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1434 	else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1435 		   tbl->action > IWL_LEGACY_SWITCH_SISO)
1436 		tbl->action = IWL_LEGACY_SWITCH_SISO;
1437 
1438 	/* configure as 1x1 if bt full concurrency */
1439 	if (priv->bt_full_concurrent) {
1440 		if (!iwl_ht_enabled(priv))
1441 			tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1442 		else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1443 			tbl->action = IWL_LEGACY_SWITCH_SISO;
1444 		valid_tx_ant =
1445 			first_antenna(priv->nvm_data->valid_tx_ant);
1446 	}
1447 
1448 	start_action = tbl->action;
1449 	for (; ;) {
1450 		lq_sta->action_counter++;
1451 		switch (tbl->action) {
1452 		case IWL_LEGACY_SWITCH_ANTENNA1:
1453 		case IWL_LEGACY_SWITCH_ANTENNA2:
1454 			IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1455 
1456 			if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1457 							tx_chains_num <= 1) ||
1458 			    (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1459 							tx_chains_num <= 2))
1460 				break;
1461 
1462 			/* Don't change antenna if success has been great */
1463 			if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1464 			    !priv->bt_full_concurrent &&
1465 			    priv->bt_traffic_load ==
1466 					IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1467 				break;
1468 
1469 			/* Set up search table to try other antenna */
1470 			memcpy(search_tbl, tbl, sz);
1471 
1472 			if (rs_toggle_antenna(valid_tx_ant,
1473 				&search_tbl->current_rate, search_tbl)) {
1474 				update_search_tbl_counter = 1;
1475 				rs_set_expected_tpt_table(lq_sta, search_tbl);
1476 				goto out;
1477 			}
1478 			break;
1479 		case IWL_LEGACY_SWITCH_SISO:
1480 			IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1481 
1482 			/* Set up search table to try SISO */
1483 			memcpy(search_tbl, tbl, sz);
1484 			search_tbl->is_SGI = 0;
1485 			ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1486 						 search_tbl, index);
1487 			if (!ret) {
1488 				lq_sta->action_counter = 0;
1489 				goto out;
1490 			}
1491 
1492 			break;
1493 		case IWL_LEGACY_SWITCH_MIMO2_AB:
1494 		case IWL_LEGACY_SWITCH_MIMO2_AC:
1495 		case IWL_LEGACY_SWITCH_MIMO2_BC:
1496 			IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1497 
1498 			/* Set up search table to try MIMO */
1499 			memcpy(search_tbl, tbl, sz);
1500 			search_tbl->is_SGI = 0;
1501 
1502 			if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1503 				search_tbl->ant_type = ANT_AB;
1504 			else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1505 				search_tbl->ant_type = ANT_AC;
1506 			else
1507 				search_tbl->ant_type = ANT_BC;
1508 
1509 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1510 				break;
1511 
1512 			ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1513 						 search_tbl, index);
1514 			if (!ret) {
1515 				lq_sta->action_counter = 0;
1516 				goto out;
1517 			}
1518 			break;
1519 
1520 		case IWL_LEGACY_SWITCH_MIMO3_ABC:
1521 			IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1522 
1523 			/* Set up search table to try MIMO3 */
1524 			memcpy(search_tbl, tbl, sz);
1525 			search_tbl->is_SGI = 0;
1526 
1527 			search_tbl->ant_type = ANT_ABC;
1528 
1529 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1530 				break;
1531 
1532 			ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1533 						 search_tbl, index);
1534 			if (!ret) {
1535 				lq_sta->action_counter = 0;
1536 				goto out;
1537 			}
1538 			break;
1539 		}
1540 		tbl->action++;
1541 		if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1542 			tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1543 
1544 		if (tbl->action == start_action)
1545 			break;
1546 
1547 	}
1548 	search_tbl->lq_type = LQ_NONE;
1549 	return;
1550 
1551 out:
1552 	lq_sta->search_better_tbl = 1;
1553 	tbl->action++;
1554 	if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1555 		tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1556 	if (update_search_tbl_counter)
1557 		search_tbl->action = tbl->action;
1558 }
1559 
1560 /*
1561  * Try to switch to new modulation mode from SISO
1562  */
1563 static void rs_move_siso_to_other(struct iwl_priv *priv,
1564 				  struct iwl_lq_sta *lq_sta,
1565 				  struct ieee80211_conf *conf,
1566 				  struct ieee80211_sta *sta, int index)
1567 {
1568 	u8 is_green = lq_sta->is_green;
1569 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1570 	struct iwl_scale_tbl_info *search_tbl =
1571 				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1572 	struct iwl_rate_scale_data *window = &(tbl->win[index]);
1573 	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1574 	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1575 		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1576 	u8 start_action;
1577 	u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1578 	u8 tx_chains_num = priv->hw_params.tx_chains_num;
1579 	u8 update_search_tbl_counter = 0;
1580 	int ret;
1581 
1582 	switch (priv->bt_traffic_load) {
1583 	case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1584 		/* nothing */
1585 		break;
1586 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1587 		/* avoid antenna B unless MIMO */
1588 		if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1589 			tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1590 		break;
1591 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1592 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1593 		/* avoid antenna B and MIMO */
1594 		valid_tx_ant =
1595 			first_antenna(priv->nvm_data->valid_tx_ant);
1596 		if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1597 			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1598 		break;
1599 	default:
1600 		IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1601 		break;
1602 	}
1603 
1604 	if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1605 	    tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1606 		/* stay in SISO */
1607 		tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1608 	}
1609 
1610 	/* configure as 1x1 if bt full concurrency */
1611 	if (priv->bt_full_concurrent) {
1612 		valid_tx_ant =
1613 			first_antenna(priv->nvm_data->valid_tx_ant);
1614 		if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1615 			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1616 	}
1617 
1618 	start_action = tbl->action;
1619 	for (;;) {
1620 		lq_sta->action_counter++;
1621 		switch (tbl->action) {
1622 		case IWL_SISO_SWITCH_ANTENNA1:
1623 		case IWL_SISO_SWITCH_ANTENNA2:
1624 			IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1625 			if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1626 						tx_chains_num <= 1) ||
1627 			    (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1628 						tx_chains_num <= 2))
1629 				break;
1630 
1631 			if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1632 			    !priv->bt_full_concurrent &&
1633 			    priv->bt_traffic_load ==
1634 					IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1635 				break;
1636 
1637 			memcpy(search_tbl, tbl, sz);
1638 			if (rs_toggle_antenna(valid_tx_ant,
1639 				       &search_tbl->current_rate, search_tbl)) {
1640 				update_search_tbl_counter = 1;
1641 				goto out;
1642 			}
1643 			break;
1644 		case IWL_SISO_SWITCH_MIMO2_AB:
1645 		case IWL_SISO_SWITCH_MIMO2_AC:
1646 		case IWL_SISO_SWITCH_MIMO2_BC:
1647 			IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1648 			memcpy(search_tbl, tbl, sz);
1649 			search_tbl->is_SGI = 0;
1650 
1651 			if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1652 				search_tbl->ant_type = ANT_AB;
1653 			else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1654 				search_tbl->ant_type = ANT_AC;
1655 			else
1656 				search_tbl->ant_type = ANT_BC;
1657 
1658 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1659 				break;
1660 
1661 			ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1662 						 search_tbl, index);
1663 			if (!ret)
1664 				goto out;
1665 			break;
1666 		case IWL_SISO_SWITCH_GI:
1667 			if (!tbl->is_ht40 && !(ht_cap->cap &
1668 						IEEE80211_HT_CAP_SGI_20))
1669 				break;
1670 			if (tbl->is_ht40 && !(ht_cap->cap &
1671 						IEEE80211_HT_CAP_SGI_40))
1672 				break;
1673 
1674 			IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1675 
1676 			memcpy(search_tbl, tbl, sz);
1677 			if (is_green) {
1678 				if (!tbl->is_SGI)
1679 					break;
1680 				else
1681 					IWL_ERR(priv,
1682 						"SGI was set in GF+SISO\n");
1683 			}
1684 			search_tbl->is_SGI = !tbl->is_SGI;
1685 			rs_set_expected_tpt_table(lq_sta, search_tbl);
1686 			if (tbl->is_SGI) {
1687 				s32 tpt = lq_sta->last_tpt / 100;
1688 				if (tpt >= search_tbl->expected_tpt[index])
1689 					break;
1690 			}
1691 			search_tbl->current_rate =
1692 				rate_n_flags_from_tbl(priv, search_tbl,
1693 						      index, is_green);
1694 			update_search_tbl_counter = 1;
1695 			goto out;
1696 		case IWL_SISO_SWITCH_MIMO3_ABC:
1697 			IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1698 			memcpy(search_tbl, tbl, sz);
1699 			search_tbl->is_SGI = 0;
1700 			search_tbl->ant_type = ANT_ABC;
1701 
1702 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1703 				break;
1704 
1705 			ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1706 						 search_tbl, index);
1707 			if (!ret)
1708 				goto out;
1709 			break;
1710 		}
1711 		tbl->action++;
1712 		if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1713 			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1714 
1715 		if (tbl->action == start_action)
1716 			break;
1717 	}
1718 	search_tbl->lq_type = LQ_NONE;
1719 	return;
1720 
1721  out:
1722 	lq_sta->search_better_tbl = 1;
1723 	tbl->action++;
1724 	if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1725 		tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1726 	if (update_search_tbl_counter)
1727 		search_tbl->action = tbl->action;
1728 }
1729 
1730 /*
1731  * Try to switch to new modulation mode from MIMO2
1732  */
1733 static void rs_move_mimo2_to_other(struct iwl_priv *priv,
1734 				   struct iwl_lq_sta *lq_sta,
1735 				   struct ieee80211_conf *conf,
1736 				   struct ieee80211_sta *sta, int index)
1737 {
1738 	s8 is_green = lq_sta->is_green;
1739 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1740 	struct iwl_scale_tbl_info *search_tbl =
1741 				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1742 	struct iwl_rate_scale_data *window = &(tbl->win[index]);
1743 	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1744 	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1745 		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1746 	u8 start_action;
1747 	u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1748 	u8 tx_chains_num = priv->hw_params.tx_chains_num;
1749 	u8 update_search_tbl_counter = 0;
1750 	int ret;
1751 
1752 	switch (priv->bt_traffic_load) {
1753 	case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1754 		/* nothing */
1755 		break;
1756 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1757 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1758 		/* avoid antenna B and MIMO */
1759 		if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1760 			tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1761 		break;
1762 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1763 		/* avoid antenna B unless MIMO */
1764 		if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1765 		    tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1766 			tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1767 		break;
1768 	default:
1769 		IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1770 		break;
1771 	}
1772 
1773 	if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1774 	    (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1775 	     tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1776 		/* switch in SISO */
1777 		tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1778 	}
1779 
1780 	/* configure as 1x1 if bt full concurrency */
1781 	if (priv->bt_full_concurrent &&
1782 	    (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1783 	     tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1784 		tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1785 
1786 	start_action = tbl->action;
1787 	for (;;) {
1788 		lq_sta->action_counter++;
1789 		switch (tbl->action) {
1790 		case IWL_MIMO2_SWITCH_ANTENNA1:
1791 		case IWL_MIMO2_SWITCH_ANTENNA2:
1792 			IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1793 
1794 			if (tx_chains_num <= 2)
1795 				break;
1796 
1797 			if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1798 				break;
1799 
1800 			memcpy(search_tbl, tbl, sz);
1801 			if (rs_toggle_antenna(valid_tx_ant,
1802 				       &search_tbl->current_rate, search_tbl)) {
1803 				update_search_tbl_counter = 1;
1804 				goto out;
1805 			}
1806 			break;
1807 		case IWL_MIMO2_SWITCH_SISO_A:
1808 		case IWL_MIMO2_SWITCH_SISO_B:
1809 		case IWL_MIMO2_SWITCH_SISO_C:
1810 			IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1811 
1812 			/* Set up new search table for SISO */
1813 			memcpy(search_tbl, tbl, sz);
1814 
1815 			if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1816 				search_tbl->ant_type = ANT_A;
1817 			else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1818 				search_tbl->ant_type = ANT_B;
1819 			else
1820 				search_tbl->ant_type = ANT_C;
1821 
1822 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1823 				break;
1824 
1825 			ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1826 						 search_tbl, index);
1827 			if (!ret)
1828 				goto out;
1829 
1830 			break;
1831 
1832 		case IWL_MIMO2_SWITCH_GI:
1833 			if (!tbl->is_ht40 && !(ht_cap->cap &
1834 						IEEE80211_HT_CAP_SGI_20))
1835 				break;
1836 			if (tbl->is_ht40 && !(ht_cap->cap &
1837 						IEEE80211_HT_CAP_SGI_40))
1838 				break;
1839 
1840 			IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1841 
1842 			/* Set up new search table for MIMO2 */
1843 			memcpy(search_tbl, tbl, sz);
1844 			search_tbl->is_SGI = !tbl->is_SGI;
1845 			rs_set_expected_tpt_table(lq_sta, search_tbl);
1846 			/*
1847 			 * If active table already uses the fastest possible
1848 			 * modulation (dual stream with short guard interval),
1849 			 * and it's working well, there's no need to look
1850 			 * for a better type of modulation!
1851 			 */
1852 			if (tbl->is_SGI) {
1853 				s32 tpt = lq_sta->last_tpt / 100;
1854 				if (tpt >= search_tbl->expected_tpt[index])
1855 					break;
1856 			}
1857 			search_tbl->current_rate =
1858 				rate_n_flags_from_tbl(priv, search_tbl,
1859 						      index, is_green);
1860 			update_search_tbl_counter = 1;
1861 			goto out;
1862 
1863 		case IWL_MIMO2_SWITCH_MIMO3_ABC:
1864 			IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1865 			memcpy(search_tbl, tbl, sz);
1866 			search_tbl->is_SGI = 0;
1867 			search_tbl->ant_type = ANT_ABC;
1868 
1869 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1870 				break;
1871 
1872 			ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1873 						 search_tbl, index);
1874 			if (!ret)
1875 				goto out;
1876 
1877 			break;
1878 		}
1879 		tbl->action++;
1880 		if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1881 			tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1882 
1883 		if (tbl->action == start_action)
1884 			break;
1885 	}
1886 	search_tbl->lq_type = LQ_NONE;
1887 	return;
1888  out:
1889 	lq_sta->search_better_tbl = 1;
1890 	tbl->action++;
1891 	if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1892 		tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1893 	if (update_search_tbl_counter)
1894 		search_tbl->action = tbl->action;
1895 
1896 }
1897 
1898 /*
1899  * Try to switch to new modulation mode from MIMO3
1900  */
1901 static void rs_move_mimo3_to_other(struct iwl_priv *priv,
1902 				   struct iwl_lq_sta *lq_sta,
1903 				   struct ieee80211_conf *conf,
1904 				   struct ieee80211_sta *sta, int index)
1905 {
1906 	s8 is_green = lq_sta->is_green;
1907 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1908 	struct iwl_scale_tbl_info *search_tbl =
1909 				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1910 	struct iwl_rate_scale_data *window = &(tbl->win[index]);
1911 	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1912 	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1913 		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1914 	u8 start_action;
1915 	u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1916 	u8 tx_chains_num = priv->hw_params.tx_chains_num;
1917 	int ret;
1918 	u8 update_search_tbl_counter = 0;
1919 
1920 	switch (priv->bt_traffic_load) {
1921 	case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1922 		/* nothing */
1923 		break;
1924 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1925 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1926 		/* avoid antenna B and MIMO */
1927 		if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1928 			tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1929 		break;
1930 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1931 		/* avoid antenna B unless MIMO */
1932 		if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1933 		    tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1934 			tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1935 		break;
1936 	default:
1937 		IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1938 		break;
1939 	}
1940 
1941 	if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1942 	    (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1943 	     tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1944 		/* switch in SISO */
1945 		tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1946 	}
1947 
1948 	/* configure as 1x1 if bt full concurrency */
1949 	if (priv->bt_full_concurrent &&
1950 	    (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1951 	     tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1952 		tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1953 
1954 	start_action = tbl->action;
1955 	for (;;) {
1956 		lq_sta->action_counter++;
1957 		switch (tbl->action) {
1958 		case IWL_MIMO3_SWITCH_ANTENNA1:
1959 		case IWL_MIMO3_SWITCH_ANTENNA2:
1960 			IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1961 
1962 			if (tx_chains_num <= 3)
1963 				break;
1964 
1965 			if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1966 				break;
1967 
1968 			memcpy(search_tbl, tbl, sz);
1969 			if (rs_toggle_antenna(valid_tx_ant,
1970 				       &search_tbl->current_rate, search_tbl))
1971 				goto out;
1972 			break;
1973 		case IWL_MIMO3_SWITCH_SISO_A:
1974 		case IWL_MIMO3_SWITCH_SISO_B:
1975 		case IWL_MIMO3_SWITCH_SISO_C:
1976 			IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1977 
1978 			/* Set up new search table for SISO */
1979 			memcpy(search_tbl, tbl, sz);
1980 
1981 			if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1982 				search_tbl->ant_type = ANT_A;
1983 			else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1984 				search_tbl->ant_type = ANT_B;
1985 			else
1986 				search_tbl->ant_type = ANT_C;
1987 
1988 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1989 				break;
1990 
1991 			ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1992 						 search_tbl, index);
1993 			if (!ret)
1994 				goto out;
1995 
1996 			break;
1997 
1998 		case IWL_MIMO3_SWITCH_MIMO2_AB:
1999 		case IWL_MIMO3_SWITCH_MIMO2_AC:
2000 		case IWL_MIMO3_SWITCH_MIMO2_BC:
2001 			IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2002 
2003 			memcpy(search_tbl, tbl, sz);
2004 			search_tbl->is_SGI = 0;
2005 			if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2006 				search_tbl->ant_type = ANT_AB;
2007 			else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2008 				search_tbl->ant_type = ANT_AC;
2009 			else
2010 				search_tbl->ant_type = ANT_BC;
2011 
2012 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2013 				break;
2014 
2015 			ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2016 						 search_tbl, index);
2017 			if (!ret)
2018 				goto out;
2019 
2020 			break;
2021 
2022 		case IWL_MIMO3_SWITCH_GI:
2023 			if (!tbl->is_ht40 && !(ht_cap->cap &
2024 						IEEE80211_HT_CAP_SGI_20))
2025 				break;
2026 			if (tbl->is_ht40 && !(ht_cap->cap &
2027 						IEEE80211_HT_CAP_SGI_40))
2028 				break;
2029 
2030 			IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2031 
2032 			/* Set up new search table for MIMO */
2033 			memcpy(search_tbl, tbl, sz);
2034 			search_tbl->is_SGI = !tbl->is_SGI;
2035 			rs_set_expected_tpt_table(lq_sta, search_tbl);
2036 			/*
2037 			 * If active table already uses the fastest possible
2038 			 * modulation (dual stream with short guard interval),
2039 			 * and it's working well, there's no need to look
2040 			 * for a better type of modulation!
2041 			 */
2042 			if (tbl->is_SGI) {
2043 				s32 tpt = lq_sta->last_tpt / 100;
2044 				if (tpt >= search_tbl->expected_tpt[index])
2045 					break;
2046 			}
2047 			search_tbl->current_rate =
2048 				rate_n_flags_from_tbl(priv, search_tbl,
2049 						      index, is_green);
2050 			update_search_tbl_counter = 1;
2051 			goto out;
2052 		}
2053 		tbl->action++;
2054 		if (tbl->action > IWL_MIMO3_SWITCH_GI)
2055 			tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2056 
2057 		if (tbl->action == start_action)
2058 			break;
2059 	}
2060 	search_tbl->lq_type = LQ_NONE;
2061 	return;
2062  out:
2063 	lq_sta->search_better_tbl = 1;
2064 	tbl->action++;
2065 	if (tbl->action > IWL_MIMO3_SWITCH_GI)
2066 		tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2067 	if (update_search_tbl_counter)
2068 		search_tbl->action = tbl->action;
2069 }
2070 
2071 /*
2072  * Check whether we should continue using same modulation mode, or
2073  * begin search for a new mode, based on:
2074  * 1) # tx successes or failures while using this mode
2075  * 2) # times calling this function
2076  * 3) elapsed time in this mode (not used, for now)
2077  */
2078 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2079 {
2080 	struct iwl_scale_tbl_info *tbl;
2081 	int i;
2082 	int active_tbl;
2083 	int flush_interval_passed = 0;
2084 	struct iwl_priv *priv;
2085 
2086 	priv = lq_sta->drv;
2087 	active_tbl = lq_sta->active_tbl;
2088 
2089 	tbl = &(lq_sta->lq_info[active_tbl]);
2090 
2091 	/* If we've been disallowing search, see if we should now allow it */
2092 	if (lq_sta->stay_in_tbl) {
2093 
2094 		/* Elapsed time using current modulation mode */
2095 		if (lq_sta->flush_timer)
2096 			flush_interval_passed =
2097 			time_after(jiffies,
2098 					(unsigned long)(lq_sta->flush_timer +
2099 					IWL_RATE_SCALE_FLUSH_INTVL));
2100 
2101 		/*
2102 		 * Check if we should allow search for new modulation mode.
2103 		 * If many frames have failed or succeeded, or we've used
2104 		 * this same modulation for a long time, allow search, and
2105 		 * reset history stats that keep track of whether we should
2106 		 * allow a new search.  Also (below) reset all bitmaps and
2107 		 * stats in active history.
2108 		 */
2109 		if (force_search ||
2110 		    (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2111 		    (lq_sta->total_success > lq_sta->max_success_limit) ||
2112 		    ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2113 		     && (flush_interval_passed))) {
2114 			IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2115 				     lq_sta->total_failed,
2116 				     lq_sta->total_success,
2117 				     flush_interval_passed);
2118 
2119 			/* Allow search for new mode */
2120 			lq_sta->stay_in_tbl = 0;	/* only place reset */
2121 			lq_sta->total_failed = 0;
2122 			lq_sta->total_success = 0;
2123 			lq_sta->flush_timer = 0;
2124 
2125 		/*
2126 		 * Else if we've used this modulation mode enough repetitions
2127 		 * (regardless of elapsed time or success/failure), reset
2128 		 * history bitmaps and rate-specific stats for all rates in
2129 		 * active table.
2130 		 */
2131 		} else {
2132 			lq_sta->table_count++;
2133 			if (lq_sta->table_count >=
2134 			    lq_sta->table_count_limit) {
2135 				lq_sta->table_count = 0;
2136 
2137 				IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2138 				for (i = 0; i < IWL_RATE_COUNT; i++)
2139 					rs_rate_scale_clear_window(
2140 						&(tbl->win[i]));
2141 			}
2142 		}
2143 
2144 		/* If transitioning to allow "search", reset all history
2145 		 * bitmaps and stats in active table (this will become the new
2146 		 * "search" table). */
2147 		if (!lq_sta->stay_in_tbl) {
2148 			for (i = 0; i < IWL_RATE_COUNT; i++)
2149 				rs_rate_scale_clear_window(&(tbl->win[i]));
2150 		}
2151 	}
2152 }
2153 
2154 /*
2155  * setup rate table in uCode
2156  */
2157 static void rs_update_rate_tbl(struct iwl_priv *priv,
2158 			       struct iwl_rxon_context *ctx,
2159 			       struct iwl_lq_sta *lq_sta,
2160 			       struct iwl_scale_tbl_info *tbl,
2161 			       int index, u8 is_green)
2162 {
2163 	u32 rate;
2164 
2165 	/* Update uCode's rate table. */
2166 	rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2167 	rs_fill_link_cmd(priv, lq_sta, rate);
2168 	iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2169 }
2170 
2171 /*
2172  * Do rate scaling and search for new modulation mode.
2173  */
2174 static void rs_rate_scale_perform(struct iwl_priv *priv,
2175 				  struct sk_buff *skb,
2176 				  struct ieee80211_sta *sta,
2177 				  struct iwl_lq_sta *lq_sta)
2178 {
2179 	struct ieee80211_hw *hw = priv->hw;
2180 	struct ieee80211_conf *conf = &hw->conf;
2181 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2182 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2183 	int low = IWL_RATE_INVALID;
2184 	int high = IWL_RATE_INVALID;
2185 	int index;
2186 	int i;
2187 	struct iwl_rate_scale_data *window = NULL;
2188 	int current_tpt = IWL_INVALID_VALUE;
2189 	int low_tpt = IWL_INVALID_VALUE;
2190 	int high_tpt = IWL_INVALID_VALUE;
2191 	u32 fail_count;
2192 	s8 scale_action = 0;
2193 	u16 rate_mask;
2194 	u8 update_lq = 0;
2195 	struct iwl_scale_tbl_info *tbl, *tbl1;
2196 	u16 rate_scale_index_msk = 0;
2197 	u8 is_green = 0;
2198 	u8 active_tbl = 0;
2199 	u8 done_search = 0;
2200 	u16 high_low;
2201 	s32 sr;
2202 	u8 tid = IWL_MAX_TID_COUNT;
2203 	struct iwl_tid_data *tid_data;
2204 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2205 	struct iwl_rxon_context *ctx = sta_priv->ctx;
2206 
2207 	IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2208 
2209 	/* Send management frames and NO_ACK data using lowest rate. */
2210 	/* TODO: this could probably be improved.. */
2211 	if (!ieee80211_is_data(hdr->frame_control) ||
2212 	    info->flags & IEEE80211_TX_CTL_NO_ACK)
2213 		return;
2214 
2215 	lq_sta->supp_rates = sta->deflink.supp_rates[lq_sta->band];
2216 
2217 	tid = rs_tl_add_packet(lq_sta, hdr);
2218 	if ((tid != IWL_MAX_TID_COUNT) &&
2219 	    (lq_sta->tx_agg_tid_en & (1 << tid))) {
2220 		tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2221 		if (tid_data->agg.state == IWL_AGG_OFF)
2222 			lq_sta->is_agg = 0;
2223 		else
2224 			lq_sta->is_agg = 1;
2225 	} else
2226 		lq_sta->is_agg = 0;
2227 
2228 	/*
2229 	 * Select rate-scale / modulation-mode table to work with in
2230 	 * the rest of this function:  "search" if searching for better
2231 	 * modulation mode, or "active" if doing rate scaling within a mode.
2232 	 */
2233 	if (!lq_sta->search_better_tbl)
2234 		active_tbl = lq_sta->active_tbl;
2235 	else
2236 		active_tbl = 1 - lq_sta->active_tbl;
2237 
2238 	tbl = &(lq_sta->lq_info[active_tbl]);
2239 	if (is_legacy(tbl->lq_type))
2240 		lq_sta->is_green = 0;
2241 	else
2242 		lq_sta->is_green = rs_use_green(sta);
2243 	is_green = lq_sta->is_green;
2244 
2245 	/* current tx rate */
2246 	index = lq_sta->last_txrate_idx;
2247 
2248 	IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2249 		       tbl->lq_type);
2250 
2251 	/* rates available for this association, and for modulation mode */
2252 	rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2253 
2254 	IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2255 
2256 	/* mask with station rate restriction */
2257 	if (is_legacy(tbl->lq_type)) {
2258 		if (lq_sta->band == NL80211_BAND_5GHZ)
2259 			/* supp_rates has no CCK bits in A mode */
2260 			rate_scale_index_msk = (u16) (rate_mask &
2261 				(lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2262 		else
2263 			rate_scale_index_msk = (u16) (rate_mask &
2264 						      lq_sta->supp_rates);
2265 
2266 	} else
2267 		rate_scale_index_msk = rate_mask;
2268 
2269 	if (!rate_scale_index_msk)
2270 		rate_scale_index_msk = rate_mask;
2271 
2272 	if (!((1 << index) & rate_scale_index_msk)) {
2273 		IWL_ERR(priv, "Current Rate is not valid\n");
2274 		if (lq_sta->search_better_tbl) {
2275 			/* revert to active table if search table is not valid*/
2276 			tbl->lq_type = LQ_NONE;
2277 			lq_sta->search_better_tbl = 0;
2278 			tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2279 			/* get "active" rate info */
2280 			index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2281 			rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2282 					   index, is_green);
2283 		}
2284 		return;
2285 	}
2286 
2287 	/* Get expected throughput table and history window for current rate */
2288 	if (!tbl->expected_tpt) {
2289 		IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2290 		return;
2291 	}
2292 
2293 	/* force user max rate if set by user */
2294 	if ((lq_sta->max_rate_idx != -1) &&
2295 	    (lq_sta->max_rate_idx < index)) {
2296 		index = lq_sta->max_rate_idx;
2297 		update_lq = 1;
2298 		window = &(tbl->win[index]);
2299 		goto lq_update;
2300 	}
2301 
2302 	window = &(tbl->win[index]);
2303 
2304 	/*
2305 	 * If there is not enough history to calculate actual average
2306 	 * throughput, keep analyzing results of more tx frames, without
2307 	 * changing rate or mode (bypass most of the rest of this function).
2308 	 * Set up new rate table in uCode only if old rate is not supported
2309 	 * in current association (use new rate found above).
2310 	 */
2311 	fail_count = window->counter - window->success_counter;
2312 	if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2313 			(window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2314 		IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2315 			       "for index %d\n",
2316 			       window->success_counter, window->counter, index);
2317 
2318 		/* Can't calculate this yet; not enough history */
2319 		window->average_tpt = IWL_INVALID_VALUE;
2320 
2321 		/* Should we stay with this modulation mode,
2322 		 * or search for a new one? */
2323 		rs_stay_in_table(lq_sta, false);
2324 
2325 		goto out;
2326 	}
2327 	/* Else we have enough samples; calculate estimate of
2328 	 * actual average throughput */
2329 	if (window->average_tpt != ((window->success_ratio *
2330 			tbl->expected_tpt[index] + 64) / 128)) {
2331 		IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2332 		window->average_tpt = ((window->success_ratio *
2333 					tbl->expected_tpt[index] + 64) / 128);
2334 	}
2335 
2336 	/* If we are searching for better modulation mode, check success. */
2337 	if (lq_sta->search_better_tbl &&
2338 	    (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2339 		/* If good success, continue using the "search" mode;
2340 		 * no need to send new link quality command, since we're
2341 		 * continuing to use the setup that we've been trying. */
2342 		if (window->average_tpt > lq_sta->last_tpt) {
2343 
2344 			IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2345 					"suc=%d cur-tpt=%d old-tpt=%d\n",
2346 					window->success_ratio,
2347 					window->average_tpt,
2348 					lq_sta->last_tpt);
2349 
2350 			if (!is_legacy(tbl->lq_type))
2351 				lq_sta->enable_counter = 1;
2352 
2353 			/* Swap tables; "search" becomes "active" */
2354 			lq_sta->active_tbl = active_tbl;
2355 			current_tpt = window->average_tpt;
2356 
2357 		/* Else poor success; go back to mode in "active" table */
2358 		} else {
2359 
2360 			IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2361 					"suc=%d cur-tpt=%d old-tpt=%d\n",
2362 					window->success_ratio,
2363 					window->average_tpt,
2364 					lq_sta->last_tpt);
2365 
2366 			/* Nullify "search" table */
2367 			tbl->lq_type = LQ_NONE;
2368 
2369 			/* Revert to "active" table */
2370 			active_tbl = lq_sta->active_tbl;
2371 			tbl = &(lq_sta->lq_info[active_tbl]);
2372 
2373 			/* Revert to "active" rate and throughput info */
2374 			index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2375 			current_tpt = lq_sta->last_tpt;
2376 
2377 			/* Need to set up a new rate table in uCode */
2378 			update_lq = 1;
2379 		}
2380 
2381 		/* Either way, we've made a decision; modulation mode
2382 		 * search is done, allow rate adjustment next time. */
2383 		lq_sta->search_better_tbl = 0;
2384 		done_search = 1;	/* Don't switch modes below! */
2385 		goto lq_update;
2386 	}
2387 
2388 	/* (Else) not in search of better modulation mode, try for better
2389 	 * starting rate, while staying in this mode. */
2390 	high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2391 					tbl->lq_type);
2392 	low = high_low & 0xff;
2393 	high = (high_low >> 8) & 0xff;
2394 
2395 	/* If user set max rate, dont allow higher than user constrain */
2396 	if ((lq_sta->max_rate_idx != -1) &&
2397 	    (lq_sta->max_rate_idx < high))
2398 		high = IWL_RATE_INVALID;
2399 
2400 	sr = window->success_ratio;
2401 
2402 	/* Collect measured throughputs for current and adjacent rates */
2403 	current_tpt = window->average_tpt;
2404 	if (low != IWL_RATE_INVALID)
2405 		low_tpt = tbl->win[low].average_tpt;
2406 	if (high != IWL_RATE_INVALID)
2407 		high_tpt = tbl->win[high].average_tpt;
2408 
2409 	scale_action = 0;
2410 
2411 	/* Too many failures, decrease rate */
2412 	if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2413 		IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2414 		scale_action = -1;
2415 
2416 	/* No throughput measured yet for adjacent rates; try increase. */
2417 	} else if ((low_tpt == IWL_INVALID_VALUE) &&
2418 		   (high_tpt == IWL_INVALID_VALUE)) {
2419 
2420 		if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2421 			scale_action = 1;
2422 		else if (low != IWL_RATE_INVALID)
2423 			scale_action = 0;
2424 	}
2425 
2426 	/* Both adjacent throughputs are measured, but neither one has better
2427 	 * throughput; we're using the best rate, don't change it! */
2428 	else if ((low_tpt != IWL_INVALID_VALUE) &&
2429 		 (high_tpt != IWL_INVALID_VALUE) &&
2430 		 (low_tpt < current_tpt) &&
2431 		 (high_tpt < current_tpt))
2432 		scale_action = 0;
2433 
2434 	/* At least one adjacent rate's throughput is measured,
2435 	 * and may have better performance. */
2436 	else {
2437 		/* Higher adjacent rate's throughput is measured */
2438 		if (high_tpt != IWL_INVALID_VALUE) {
2439 			/* Higher rate has better throughput */
2440 			if (high_tpt > current_tpt &&
2441 					sr >= IWL_RATE_INCREASE_TH) {
2442 				scale_action = 1;
2443 			} else {
2444 				scale_action = 0;
2445 			}
2446 
2447 		/* Lower adjacent rate's throughput is measured */
2448 		} else if (low_tpt != IWL_INVALID_VALUE) {
2449 			/* Lower rate has better throughput */
2450 			if (low_tpt > current_tpt) {
2451 				IWL_DEBUG_RATE(priv,
2452 				    "decrease rate because of low tpt\n");
2453 				scale_action = -1;
2454 			} else if (sr >= IWL_RATE_INCREASE_TH) {
2455 				scale_action = 1;
2456 			}
2457 		}
2458 	}
2459 
2460 	/* Sanity check; asked for decrease, but success rate or throughput
2461 	 * has been good at old rate.  Don't change it. */
2462 	if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2463 		    ((sr > IWL_RATE_HIGH_TH) ||
2464 		     (current_tpt > (100 * tbl->expected_tpt[low]))))
2465 		scale_action = 0;
2466 	if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2467 		scale_action = -1;
2468 	if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2469 		(is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2470 		scale_action = -1;
2471 
2472 	if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2473 	     (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2474 		if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2475 			/*
2476 			 * don't set scale_action, don't want to scale up if
2477 			 * the rate scale doesn't otherwise think that is a
2478 			 * good idea.
2479 			 */
2480 		} else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2481 			scale_action = -1;
2482 		}
2483 	}
2484 	lq_sta->last_bt_traffic = priv->bt_traffic_load;
2485 
2486 	if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2487 	     (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2488 		/* search for a new modulation */
2489 		rs_stay_in_table(lq_sta, true);
2490 		goto lq_update;
2491 	}
2492 
2493 	switch (scale_action) {
2494 	case -1:
2495 		/* Decrease starting rate, update uCode's rate table */
2496 		if (low != IWL_RATE_INVALID) {
2497 			update_lq = 1;
2498 			index = low;
2499 		}
2500 
2501 		break;
2502 	case 1:
2503 		/* Increase starting rate, update uCode's rate table */
2504 		if (high != IWL_RATE_INVALID) {
2505 			update_lq = 1;
2506 			index = high;
2507 		}
2508 
2509 		break;
2510 	case 0:
2511 		/* No change */
2512 	default:
2513 		break;
2514 	}
2515 
2516 	IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2517 		    "high %d type %d\n",
2518 		     index, scale_action, low, high, tbl->lq_type);
2519 
2520 lq_update:
2521 	/* Replace uCode's rate table for the destination station. */
2522 	if (update_lq)
2523 		rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2524 
2525 	if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2526 		/* Should we stay with this modulation mode,
2527 		 * or search for a new one? */
2528 	  rs_stay_in_table(lq_sta, false);
2529 	}
2530 	/*
2531 	 * Search for new modulation mode if we're:
2532 	 * 1)  Not changing rates right now
2533 	 * 2)  Not just finishing up a search
2534 	 * 3)  Allowing a new search
2535 	 */
2536 	if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2537 		/* Save current throughput to compare with "search" throughput*/
2538 		lq_sta->last_tpt = current_tpt;
2539 
2540 		/* Select a new "search" modulation mode to try.
2541 		 * If one is found, set up the new "search" table. */
2542 		if (is_legacy(tbl->lq_type))
2543 			rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2544 		else if (is_siso(tbl->lq_type))
2545 			rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2546 		else if (is_mimo2(tbl->lq_type))
2547 			rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2548 		else
2549 			rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2550 
2551 		/* If new "search" mode was selected, set up in uCode table */
2552 		if (lq_sta->search_better_tbl) {
2553 			/* Access the "search" table, clear its history. */
2554 			tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2555 			for (i = 0; i < IWL_RATE_COUNT; i++)
2556 				rs_rate_scale_clear_window(&(tbl->win[i]));
2557 
2558 			/* Use new "search" start rate */
2559 			index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2560 
2561 			IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2562 				     tbl->current_rate, index);
2563 			rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2564 			iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2565 		} else
2566 			done_search = 1;
2567 	}
2568 
2569 	if (done_search && !lq_sta->stay_in_tbl) {
2570 		/* If the "active" (non-search) mode was legacy,
2571 		 * and we've tried switching antennas,
2572 		 * but we haven't been able to try HT modes (not available),
2573 		 * stay with best antenna legacy modulation for a while
2574 		 * before next round of mode comparisons. */
2575 		tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2576 		if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2577 		    lq_sta->action_counter > tbl1->max_search) {
2578 			IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2579 			rs_set_stay_in_table(priv, 1, lq_sta);
2580 		}
2581 
2582 		/* If we're in an HT mode, and all 3 mode switch actions
2583 		 * have been tried and compared, stay in this best modulation
2584 		 * mode for a while before next round of mode comparisons. */
2585 		if (lq_sta->enable_counter &&
2586 		    (lq_sta->action_counter >= tbl1->max_search) &&
2587 		    iwl_ht_enabled(priv)) {
2588 			if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2589 			    (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2590 			    (tid != IWL_MAX_TID_COUNT)) {
2591 				u8 sta_id = lq_sta->lq.sta_id;
2592 				tid_data = &priv->tid_data[sta_id][tid];
2593 				if (tid_data->agg.state == IWL_AGG_OFF) {
2594 					IWL_DEBUG_RATE(priv,
2595 						       "try to aggregate tid %d\n",
2596 						       tid);
2597 					rs_tl_turn_on_agg(priv, tid,
2598 							  lq_sta, sta);
2599 				}
2600 			}
2601 			rs_set_stay_in_table(priv, 0, lq_sta);
2602 		}
2603 	}
2604 
2605 out:
2606 	tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2607 	lq_sta->last_txrate_idx = index;
2608 }
2609 
2610 /*
2611  * rs_initialize_lq - Initialize a station's hardware rate table
2612  *
2613  * The uCode's station table contains a table of fallback rates
2614  * for automatic fallback during transmission.
2615  *
2616  * NOTE: This sets up a default set of values.  These will be replaced later
2617  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2618  *       rc80211_simple.
2619  *
2620  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2621  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2622  *       which requires station table entry to exist).
2623  */
2624 static void rs_initialize_lq(struct iwl_priv *priv,
2625 			     struct ieee80211_sta *sta,
2626 			     struct iwl_lq_sta *lq_sta)
2627 {
2628 	struct iwl_scale_tbl_info *tbl;
2629 	int rate_idx;
2630 	int i;
2631 	u32 rate;
2632 	u8 use_green = rs_use_green(sta);
2633 	u8 active_tbl = 0;
2634 	u8 valid_tx_ant;
2635 	struct iwl_station_priv *sta_priv;
2636 	struct iwl_rxon_context *ctx;
2637 
2638 	if (!sta || !lq_sta)
2639 		return;
2640 
2641 	sta_priv = (void *)sta->drv_priv;
2642 	ctx = sta_priv->ctx;
2643 
2644 	i = lq_sta->last_txrate_idx;
2645 
2646 	valid_tx_ant = priv->nvm_data->valid_tx_ant;
2647 
2648 	if (!lq_sta->search_better_tbl)
2649 		active_tbl = lq_sta->active_tbl;
2650 	else
2651 		active_tbl = 1 - lq_sta->active_tbl;
2652 
2653 	tbl = &(lq_sta->lq_info[active_tbl]);
2654 
2655 	if ((i < 0) || (i >= IWL_RATE_COUNT))
2656 		i = 0;
2657 
2658 	rate = iwl_rates[i].plcp;
2659 	tbl->ant_type = first_antenna(valid_tx_ant);
2660 	rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2661 
2662 	if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2663 		rate |= RATE_MCS_CCK_MSK;
2664 
2665 	rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2666 	if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2667 	    rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2668 
2669 	rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2670 	tbl->current_rate = rate;
2671 	rs_set_expected_tpt_table(lq_sta, tbl);
2672 	rs_fill_link_cmd(NULL, lq_sta, rate);
2673 	priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2674 	iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true);
2675 }
2676 
2677 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2678 			struct ieee80211_tx_rate_control *txrc)
2679 {
2680 
2681 	struct sk_buff *skb = txrc->skb;
2682 	struct ieee80211_supported_band *sband = txrc->sband;
2683 	struct iwl_op_mode *op_mode __maybe_unused =
2684 			(struct iwl_op_mode *)priv_r;
2685 	struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2686 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2687 	struct iwl_lq_sta *lq_sta = priv_sta;
2688 	int rate_idx;
2689 
2690 	IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2691 
2692 	/* Get max rate if user set max rate */
2693 	if (lq_sta) {
2694 		lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
2695 		if ((sband->band == NL80211_BAND_5GHZ) &&
2696 		    (lq_sta->max_rate_idx != -1))
2697 			lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2698 		if ((lq_sta->max_rate_idx < 0) ||
2699 		    (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2700 			lq_sta->max_rate_idx = -1;
2701 	}
2702 
2703 	/* Treat uninitialized rate scaling data same as non-existing. */
2704 	if (lq_sta && !lq_sta->drv) {
2705 		IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2706 		priv_sta = NULL;
2707 	}
2708 
2709 	rate_idx  = lq_sta->last_txrate_idx;
2710 
2711 	if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2712 		rate_idx -= IWL_FIRST_OFDM_RATE;
2713 		/* 6M and 9M shared same MCS index */
2714 		rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2715 		if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2716 		    IWL_RATE_MIMO3_6M_PLCP)
2717 			rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2718 		else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2719 			 IWL_RATE_MIMO2_6M_PLCP)
2720 			rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2721 		info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2722 		if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2723 			info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2724 		if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2725 			info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2726 		if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2727 			info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2728 		if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2729 			info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2730 	} else {
2731 		/* Check for invalid rates */
2732 		if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2733 				((sband->band == NL80211_BAND_5GHZ) &&
2734 				 (rate_idx < IWL_FIRST_OFDM_RATE)))
2735 			rate_idx = rate_lowest_index(sband, sta);
2736 		/* On valid 5 GHz rate, adjust index */
2737 		else if (sband->band == NL80211_BAND_5GHZ)
2738 			rate_idx -= IWL_FIRST_OFDM_RATE;
2739 		info->control.rates[0].flags = 0;
2740 	}
2741 	info->control.rates[0].idx = rate_idx;
2742 	info->control.rates[0].count = 1;
2743 }
2744 
2745 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2746 			  gfp_t gfp)
2747 {
2748 	struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2749 	struct iwl_op_mode *op_mode __maybe_unused =
2750 			(struct iwl_op_mode *)priv_rate;
2751 	struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2752 
2753 	IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2754 
2755 	return &sta_priv->lq_sta;
2756 }
2757 
2758 /*
2759  * Called after adding a new station to initialize rate scaling
2760  */
2761 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2762 {
2763 	int i, j;
2764 	struct ieee80211_hw *hw = priv->hw;
2765 	struct ieee80211_conf *conf = &priv->hw->conf;
2766 	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2767 	struct iwl_station_priv *sta_priv;
2768 	struct iwl_lq_sta *lq_sta;
2769 	struct ieee80211_supported_band *sband;
2770 	unsigned long supp; /* must be unsigned long for for_each_set_bit */
2771 
2772 	sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2773 	lq_sta = &sta_priv->lq_sta;
2774 	sband = hw->wiphy->bands[conf->chandef.chan->band];
2775 
2776 
2777 	lq_sta->lq.sta_id = sta_id;
2778 
2779 	for (j = 0; j < LQ_SIZE; j++)
2780 		for (i = 0; i < IWL_RATE_COUNT; i++)
2781 			rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2782 
2783 	lq_sta->flush_timer = 0;
2784 	lq_sta->supp_rates = sta->deflink.supp_rates[sband->band];
2785 
2786 	IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2787 		       sta_id);
2788 	/* TODO: what is a good starting rate for STA? About middle? Maybe not
2789 	 * the lowest or the highest rate.. Could consider using RSSI from
2790 	 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2791 	 * after assoc.. */
2792 
2793 	lq_sta->is_dup = 0;
2794 	lq_sta->max_rate_idx = -1;
2795 	lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2796 	lq_sta->is_green = rs_use_green(sta);
2797 	lq_sta->band = sband->band;
2798 	/*
2799 	 * active legacy rates as per supported rates bitmap
2800 	 */
2801 	supp = sta->deflink.supp_rates[sband->band];
2802 	lq_sta->active_legacy_rate = 0;
2803 	for_each_set_bit(i, &supp, BITS_PER_LONG)
2804 		lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2805 
2806 	/*
2807 	 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2808 	 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2809 	 */
2810 	lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2811 	lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2812 	lq_sta->active_siso_rate &= ~((u16)0x2);
2813 	lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2814 
2815 	/* Same here */
2816 	lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2817 	lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2818 	lq_sta->active_mimo2_rate &= ~((u16)0x2);
2819 	lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2820 
2821 	lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2822 	lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2823 	lq_sta->active_mimo3_rate &= ~((u16)0x2);
2824 	lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2825 
2826 	IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2827 		     lq_sta->active_siso_rate,
2828 		     lq_sta->active_mimo2_rate,
2829 		     lq_sta->active_mimo3_rate);
2830 
2831 	/* These values will be overridden later */
2832 	lq_sta->lq.general_params.single_stream_ant_msk =
2833 		first_antenna(priv->nvm_data->valid_tx_ant);
2834 	lq_sta->lq.general_params.dual_stream_ant_msk =
2835 		priv->nvm_data->valid_tx_ant &
2836 		~first_antenna(priv->nvm_data->valid_tx_ant);
2837 	if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2838 		lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2839 	} else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2840 		lq_sta->lq.general_params.dual_stream_ant_msk =
2841 			priv->nvm_data->valid_tx_ant;
2842 	}
2843 
2844 	/* as default allow aggregation for all tids */
2845 	lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2846 	lq_sta->drv = priv;
2847 
2848 	/* Set last_txrate_idx to lowest rate */
2849 	lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2850 	if (sband->band == NL80211_BAND_5GHZ)
2851 		lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2852 	lq_sta->is_agg = 0;
2853 #ifdef CONFIG_MAC80211_DEBUGFS
2854 	lq_sta->dbg_fixed_rate = 0;
2855 #endif
2856 
2857 	rs_initialize_lq(priv, sta, lq_sta);
2858 }
2859 
2860 static void rs_fill_link_cmd(struct iwl_priv *priv,
2861 			     struct iwl_lq_sta *lq_sta, u32 new_rate)
2862 {
2863 	struct iwl_scale_tbl_info tbl_type;
2864 	int index = 0;
2865 	int rate_idx;
2866 	int repeat_rate = 0;
2867 	u8 ant_toggle_cnt = 0;
2868 	u8 use_ht_possible = 1;
2869 	u8 valid_tx_ant = 0;
2870 	struct iwl_station_priv *sta_priv =
2871 		container_of(lq_sta, struct iwl_station_priv, lq_sta);
2872 	struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2873 
2874 	/* Override starting rate (index 0) if needed for debug purposes */
2875 	rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2876 
2877 	/* Interpret new_rate (rate_n_flags) */
2878 	rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2879 				  &tbl_type, &rate_idx);
2880 
2881 	if (priv && priv->bt_full_concurrent) {
2882 		/* 1x1 only */
2883 		tbl_type.ant_type =
2884 			first_antenna(priv->nvm_data->valid_tx_ant);
2885 	}
2886 
2887 	/* How many times should we repeat the initial rate? */
2888 	if (is_legacy(tbl_type.lq_type)) {
2889 		ant_toggle_cnt = 1;
2890 		repeat_rate = IWL_NUMBER_TRY;
2891 	} else {
2892 		repeat_rate = min(IWL_HT_NUMBER_TRY,
2893 				  LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2894 	}
2895 
2896 	lq_cmd->general_params.mimo_delimiter =
2897 			is_mimo(tbl_type.lq_type) ? 1 : 0;
2898 
2899 	/* Fill 1st table entry (index 0) */
2900 	lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2901 
2902 	if (num_of_ant(tbl_type.ant_type) == 1) {
2903 		lq_cmd->general_params.single_stream_ant_msk =
2904 						tbl_type.ant_type;
2905 	} else if (num_of_ant(tbl_type.ant_type) == 2) {
2906 		lq_cmd->general_params.dual_stream_ant_msk =
2907 						tbl_type.ant_type;
2908 	} /* otherwise we don't modify the existing value */
2909 
2910 	index++;
2911 	repeat_rate--;
2912 	if (priv) {
2913 		if (priv->bt_full_concurrent)
2914 			valid_tx_ant = ANT_A;
2915 		else
2916 			valid_tx_ant = priv->nvm_data->valid_tx_ant;
2917 	}
2918 
2919 	/* Fill rest of rate table */
2920 	while (index < LINK_QUAL_MAX_RETRY_NUM) {
2921 		/* Repeat initial/next rate.
2922 		 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2923 		 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2924 		while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2925 			if (is_legacy(tbl_type.lq_type)) {
2926 				if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2927 					ant_toggle_cnt++;
2928 				else if (priv &&
2929 					 rs_toggle_antenna(valid_tx_ant,
2930 							&new_rate, &tbl_type))
2931 					ant_toggle_cnt = 1;
2932 			}
2933 
2934 			/* Override next rate if needed for debug purposes */
2935 			rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2936 
2937 			/* Fill next table entry */
2938 			lq_cmd->rs_table[index].rate_n_flags =
2939 					cpu_to_le32(new_rate);
2940 			repeat_rate--;
2941 			index++;
2942 		}
2943 
2944 		rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2945 						&rate_idx);
2946 
2947 		if (priv && priv->bt_full_concurrent) {
2948 			/* 1x1 only */
2949 			tbl_type.ant_type =
2950 			    first_antenna(priv->nvm_data->valid_tx_ant);
2951 		}
2952 
2953 		/* Indicate to uCode which entries might be MIMO.
2954 		 * If initial rate was MIMO, this will finally end up
2955 		 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2956 		if (is_mimo(tbl_type.lq_type))
2957 			lq_cmd->general_params.mimo_delimiter = index;
2958 
2959 		/* Get next rate */
2960 		new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2961 					     use_ht_possible);
2962 
2963 		/* How many times should we repeat the next rate? */
2964 		if (is_legacy(tbl_type.lq_type)) {
2965 			if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2966 				ant_toggle_cnt++;
2967 			else if (priv &&
2968 				 rs_toggle_antenna(valid_tx_ant,
2969 						   &new_rate, &tbl_type))
2970 				ant_toggle_cnt = 1;
2971 
2972 			repeat_rate = IWL_NUMBER_TRY;
2973 		} else {
2974 			repeat_rate = IWL_HT_NUMBER_TRY;
2975 		}
2976 
2977 		/* Don't allow HT rates after next pass.
2978 		 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2979 		use_ht_possible = 0;
2980 
2981 		/* Override next rate if needed for debug purposes */
2982 		rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2983 
2984 		/* Fill next table entry */
2985 		lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2986 
2987 		index++;
2988 		repeat_rate--;
2989 	}
2990 
2991 	lq_cmd->agg_params.agg_frame_cnt_limit =
2992 		sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2993 	lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2994 
2995 	lq_cmd->agg_params.agg_time_limit =
2996 		cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2997 	/*
2998 	 * overwrite if needed, pass aggregation time limit
2999 	 * to uCode in uSec
3000 	 */
3001 	if (priv && priv->lib->bt_params &&
3002 	    priv->lib->bt_params->agg_time_limit &&
3003 	    priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3004 		lq_cmd->agg_params.agg_time_limit =
3005 			cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3006 }
3007 
3008 static void *rs_alloc(struct ieee80211_hw *hw)
3009 {
3010 	return hw->priv;
3011 }
3012 /* rate scale requires free function to be implemented */
3013 static void rs_free(void *priv_rate)
3014 {
3015 	return;
3016 }
3017 
3018 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3019 			void *priv_sta)
3020 {
3021 	struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3022 	struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3023 
3024 	IWL_DEBUG_RATE(priv, "enter\n");
3025 	IWL_DEBUG_RATE(priv, "leave\n");
3026 }
3027 
3028 #ifdef CONFIG_MAC80211_DEBUGFS
3029 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3030 			     u32 *rate_n_flags, int index)
3031 {
3032 	struct iwl_priv *priv;
3033 	u8 valid_tx_ant;
3034 	u8 ant_sel_tx;
3035 
3036 	priv = lq_sta->drv;
3037 	valid_tx_ant = priv->nvm_data->valid_tx_ant;
3038 	if (lq_sta->dbg_fixed_rate) {
3039 		ant_sel_tx =
3040 		  ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3041 		  >> RATE_MCS_ANT_POS);
3042 		if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3043 			*rate_n_flags = lq_sta->dbg_fixed_rate;
3044 			IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3045 		} else {
3046 			lq_sta->dbg_fixed_rate = 0;
3047 			IWL_ERR(priv,
3048 			    "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3049 			    ant_sel_tx, valid_tx_ant);
3050 			IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3051 		}
3052 	} else {
3053 		IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3054 	}
3055 }
3056 
3057 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3058 			const char __user *user_buf, size_t count, loff_t *ppos)
3059 {
3060 	struct iwl_lq_sta *lq_sta = file->private_data;
3061 	struct iwl_priv *priv;
3062 	char buf[64];
3063 	size_t buf_size;
3064 	u32 parsed_rate;
3065 
3066 
3067 	priv = lq_sta->drv;
3068 	memset(buf, 0, sizeof(buf));
3069 	buf_size = min(count, sizeof(buf) -  1);
3070 	if (copy_from_user(buf, user_buf, buf_size))
3071 		return -EFAULT;
3072 
3073 	if (sscanf(buf, "%x", &parsed_rate) == 1)
3074 		lq_sta->dbg_fixed_rate = parsed_rate;
3075 	else
3076 		lq_sta->dbg_fixed_rate = 0;
3077 
3078 	rs_program_fix_rate(priv, lq_sta);
3079 
3080 	return count;
3081 }
3082 
3083 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3084 			char __user *user_buf, size_t count, loff_t *ppos)
3085 {
3086 	char *buff;
3087 	int desc = 0;
3088 	int i = 0;
3089 	int index = 0;
3090 	ssize_t ret;
3091 
3092 	struct iwl_lq_sta *lq_sta = file->private_data;
3093 	struct iwl_priv *priv;
3094 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3095 
3096 	priv = lq_sta->drv;
3097 	buff = kmalloc(1024, GFP_KERNEL);
3098 	if (!buff)
3099 		return -ENOMEM;
3100 
3101 	desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3102 	desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3103 			lq_sta->total_failed, lq_sta->total_success,
3104 			lq_sta->active_legacy_rate);
3105 	desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3106 			lq_sta->dbg_fixed_rate);
3107 	desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3108 	    (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3109 	    (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3110 	    (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3111 	desc += sprintf(buff+desc, "lq type %s\n",
3112 	   (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3113 	if (is_Ht(tbl->lq_type)) {
3114 		desc += sprintf(buff + desc, " %s",
3115 		   (is_siso(tbl->lq_type)) ? "SISO" :
3116 		   ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3117 		desc += sprintf(buff + desc, " %s",
3118 		   (tbl->is_ht40) ? "40MHz" : "20MHz");
3119 		desc += sprintf(buff + desc, " %s %s %s\n",
3120 		   (tbl->is_SGI) ? "SGI" : "",
3121 		   (lq_sta->is_green) ? "GF enabled" : "",
3122 		   (lq_sta->is_agg) ? "AGG on" : "");
3123 	}
3124 	desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3125 		lq_sta->last_rate_n_flags);
3126 	desc += sprintf(buff+desc, "general:"
3127 		"flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3128 		lq_sta->lq.general_params.flags,
3129 		lq_sta->lq.general_params.mimo_delimiter,
3130 		lq_sta->lq.general_params.single_stream_ant_msk,
3131 		lq_sta->lq.general_params.dual_stream_ant_msk);
3132 
3133 	desc += sprintf(buff+desc, "agg:"
3134 			"time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3135 			le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3136 			lq_sta->lq.agg_params.agg_dis_start_th,
3137 			lq_sta->lq.agg_params.agg_frame_cnt_limit);
3138 
3139 	desc += sprintf(buff+desc,
3140 			"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3141 			lq_sta->lq.general_params.start_rate_index[0],
3142 			lq_sta->lq.general_params.start_rate_index[1],
3143 			lq_sta->lq.general_params.start_rate_index[2],
3144 			lq_sta->lq.general_params.start_rate_index[3]);
3145 
3146 	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3147 		index = iwl_hwrate_to_plcp_idx(
3148 			le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3149 		if (is_legacy(tbl->lq_type)) {
3150 			desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3151 				i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3152 				iwl_rate_mcs[index].mbps);
3153 		} else {
3154 			desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3155 				i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3156 				iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3157 		}
3158 	}
3159 
3160 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3161 	kfree(buff);
3162 	return ret;
3163 }
3164 
3165 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3166 	.write = rs_sta_dbgfs_scale_table_write,
3167 	.read = rs_sta_dbgfs_scale_table_read,
3168 	.open = simple_open,
3169 	.llseek = default_llseek,
3170 };
3171 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3172 			char __user *user_buf, size_t count, loff_t *ppos)
3173 {
3174 	char *buff;
3175 	int desc = 0;
3176 	int i, j;
3177 	ssize_t ret;
3178 
3179 	struct iwl_lq_sta *lq_sta = file->private_data;
3180 
3181 	buff = kmalloc(1024, GFP_KERNEL);
3182 	if (!buff)
3183 		return -ENOMEM;
3184 
3185 	for (i = 0; i < LQ_SIZE; i++) {
3186 		desc += sprintf(buff+desc,
3187 				"%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3188 				"rate=0x%X\n",
3189 				lq_sta->active_tbl == i ? "*" : "x",
3190 				lq_sta->lq_info[i].lq_type,
3191 				lq_sta->lq_info[i].is_SGI,
3192 				lq_sta->lq_info[i].is_ht40,
3193 				lq_sta->lq_info[i].is_dup,
3194 				lq_sta->is_green,
3195 				lq_sta->lq_info[i].current_rate);
3196 		for (j = 0; j < IWL_RATE_COUNT; j++) {
3197 			desc += sprintf(buff+desc,
3198 				"counter=%d success=%d %%=%d\n",
3199 				lq_sta->lq_info[i].win[j].counter,
3200 				lq_sta->lq_info[i].win[j].success_counter,
3201 				lq_sta->lq_info[i].win[j].success_ratio);
3202 		}
3203 	}
3204 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3205 	kfree(buff);
3206 	return ret;
3207 }
3208 
3209 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3210 	.read = rs_sta_dbgfs_stats_table_read,
3211 	.open = simple_open,
3212 	.llseek = default_llseek,
3213 };
3214 
3215 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3216 			char __user *user_buf, size_t count, loff_t *ppos)
3217 {
3218 	struct iwl_lq_sta *lq_sta = file->private_data;
3219 	struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3220 	char buff[120];
3221 	int desc = 0;
3222 
3223 	if (is_Ht(tbl->lq_type))
3224 		desc += sprintf(buff+desc,
3225 				"Bit Rate= %d Mb/s\n",
3226 				tbl->expected_tpt[lq_sta->last_txrate_idx]);
3227 	else
3228 		desc += sprintf(buff+desc,
3229 				"Bit Rate= %d Mb/s\n",
3230 				iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3231 
3232 	return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3233 }
3234 
3235 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3236 	.read = rs_sta_dbgfs_rate_scale_data_read,
3237 	.open = simple_open,
3238 	.llseek = default_llseek,
3239 };
3240 
3241 static void rs_add_debugfs(void *priv, void *priv_sta,
3242 					struct dentry *dir)
3243 {
3244 	struct iwl_lq_sta *lq_sta = priv_sta;
3245 
3246 	debugfs_create_file("rate_scale_table", 0600, dir, lq_sta,
3247 			    &rs_sta_dbgfs_scale_table_ops);
3248 	debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
3249 			    &rs_sta_dbgfs_stats_table_ops);
3250 	debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
3251 			    &rs_sta_dbgfs_rate_scale_data_ops);
3252 	debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
3253 			  &lq_sta->tx_agg_tid_en);
3254 
3255 }
3256 #endif
3257 
3258 /*
3259  * Initialization of rate scaling information is done by driver after
3260  * the station is added. Since mac80211 calls this function before a
3261  * station is added we ignore it.
3262  */
3263 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3264 			      struct cfg80211_chan_def *chandef,
3265 			      struct ieee80211_sta *sta, void *priv_sta)
3266 {
3267 }
3268 
3269 static const struct rate_control_ops rs_ops = {
3270 	.name = RS_NAME,
3271 	.tx_status = rs_tx_status,
3272 	.get_rate = rs_get_rate,
3273 	.rate_init = rs_rate_init_stub,
3274 	.alloc = rs_alloc,
3275 	.free = rs_free,
3276 	.alloc_sta = rs_alloc_sta,
3277 	.free_sta = rs_free_sta,
3278 #ifdef CONFIG_MAC80211_DEBUGFS
3279 	.add_sta_debugfs = rs_add_debugfs,
3280 #endif
3281 };
3282 
3283 int iwlagn_rate_control_register(void)
3284 {
3285 	return ieee80211_rate_control_register(&rs_ops);
3286 }
3287 
3288 void iwlagn_rate_control_unregister(void)
3289 {
3290 	ieee80211_rate_control_unregister(&rs_ops);
3291 }
3292 
3293