1 /******************************************************************************
2  *
3  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of version 2 of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17  *
18  * The full GNU General Public License is included in this distribution in the
19  * file called LICENSE.
20  *
21  * Contact Information:
22  *  Intel Linux Wireless <ilw@linux.intel.com>
23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24  *
25  *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/skbuff.h>
28 #include <linux/slab.h>
29 #include <net/mac80211.h>
30 
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/delay.h>
34 
35 #include <linux/workqueue.h>
36 
37 #include "common.h"
38 #include "4965.h"
39 
40 #define IL4965_RS_NAME "iwl-4965-rs"
41 
42 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
43 #define IL_NUMBER_TRY      1
44 #define IL_HT_NUMBER_TRY   3
45 
46 #define RATE_MAX_WINDOW		62	/* # tx in history win */
47 #define RATE_MIN_FAILURE_TH		6	/* min failures to calc tpt */
48 #define RATE_MIN_SUCCESS_TH		8	/* min successes to calc tpt */
49 
50 /* max allowed rate miss before sync LQ cmd */
51 #define IL_MISSED_RATE_MAX		15
52 /* max time to accum history 2 seconds */
53 #define RATE_SCALE_FLUSH_INTVL   (3*HZ)
54 
55 static u8 rs_ht_to_legacy[] = {
56 	RATE_6M_IDX, RATE_6M_IDX,
57 	RATE_6M_IDX, RATE_6M_IDX,
58 	RATE_6M_IDX,
59 	RATE_6M_IDX, RATE_9M_IDX,
60 	RATE_12M_IDX, RATE_18M_IDX,
61 	RATE_24M_IDX, RATE_36M_IDX,
62 	RATE_48M_IDX, RATE_54M_IDX
63 };
64 
65 static const u8 ant_toggle_lookup[] = {
66 	/*ANT_NONE -> */ ANT_NONE,
67 	/*ANT_A    -> */ ANT_B,
68 	/*ANT_B    -> */ ANT_C,
69 	/*ANT_AB   -> */ ANT_BC,
70 	/*ANT_C    -> */ ANT_A,
71 	/*ANT_AC   -> */ ANT_AB,
72 	/*ANT_BC   -> */ ANT_AC,
73 	/*ANT_ABC  -> */ ANT_ABC,
74 };
75 
76 #define IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
77 	[RATE_##r##M_IDX] = { RATE_##r##M_PLCP,      \
78 				    RATE_SISO_##s##M_PLCP, \
79 				    RATE_MIMO2_##s##M_PLCP,\
80 				    RATE_##r##M_IEEE,      \
81 				    RATE_##ip##M_IDX,    \
82 				    RATE_##in##M_IDX,    \
83 				    RATE_##rp##M_IDX,    \
84 				    RATE_##rn##M_IDX,    \
85 				    RATE_##pp##M_IDX,    \
86 				    RATE_##np##M_IDX }
87 
88 /*
89  * Parameter order:
90  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
91  *
92  * If there isn't a valid next or previous rate then INV is used which
93  * maps to RATE_INVALID
94  *
95  */
96 const struct il_rate_info il_rates[RATE_COUNT] = {
97 	IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),	/*  1mbps */
98 	IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),		/*  2mbps */
99 	IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),	/*5.5mbps */
100 	IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),	/* 11mbps */
101 	IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),		/*  6mbps */
102 	IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),	/*  9mbps */
103 	IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),	/* 12mbps */
104 	IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),	/* 18mbps */
105 	IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),	/* 24mbps */
106 	IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),	/* 36mbps */
107 	IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),	/* 48mbps */
108 	IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
109 	IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
110 };
111 
112 static int
113 il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
114 {
115 	int idx = 0;
116 
117 	/* HT rate format */
118 	if (rate_n_flags & RATE_MCS_HT_MSK) {
119 		idx = (rate_n_flags & 0xff);
120 
121 		if (idx >= RATE_MIMO2_6M_PLCP)
122 			idx = idx - RATE_MIMO2_6M_PLCP;
123 
124 		idx += IL_FIRST_OFDM_RATE;
125 		/* skip 9M not supported in ht */
126 		if (idx >= RATE_9M_IDX)
127 			idx += 1;
128 		if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
129 			return idx;
130 
131 		/* legacy rate format, search for match in table */
132 	} else {
133 		for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
134 			if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
135 				return idx;
136 	}
137 
138 	return -1;
139 }
140 
141 static void il4965_rs_rate_scale_perform(struct il_priv *il,
142 					 struct sk_buff *skb,
143 					 struct ieee80211_sta *sta,
144 					 struct il_lq_sta *lq_sta);
145 static void il4965_rs_fill_link_cmd(struct il_priv *il,
146 				    struct il_lq_sta *lq_sta, u32 rate_n_flags);
147 static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
148 				    bool force_search);
149 
150 #ifdef CONFIG_MAC80211_DEBUGFS
151 static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
152 				    u32 *rate_n_flags, int idx);
153 #else
154 static void
155 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
156 {
157 }
158 #endif
159 
160 /**
161  * The following tables contain the expected throughput metrics for all rates
162  *
163  *	1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
164  *
165  * where invalid entries are zeros.
166  *
167  * CCK rates are only valid in legacy table and will only be used in G
168  * (2.4 GHz) band.
169  */
170 
171 static s32 expected_tpt_legacy[RATE_COUNT] = {
172 	7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
173 };
174 
175 static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
176 	{0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202},	/* Norm */
177 	{0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210},	/* SGI */
178 	{0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381},	/* AGG */
179 	{0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413},	/* AGG+SGI */
180 };
181 
182 static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {
183 	{0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257},	/* Norm */
184 	{0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264},	/* SGI */
185 	{0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640},	/* AGG */
186 	{0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683},	/* AGG+SGI */
187 };
188 
189 static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
190 	{0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250},	/* Norm */
191 	{0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256},	/* SGI */
192 	{0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619},	/* AGG */
193 	{0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660},	/* AGG+SGI */
194 };
195 
196 static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {
197 	{0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289},	/* Norm */
198 	{0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293},	/* SGI */
199 	{0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922},	/* AGG */
200 	{0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966},	/* AGG+SGI */
201 };
202 
203 /* mbps, mcs */
204 static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {
205 	{"1", "BPSK DSSS"},
206 	{"2", "QPSK DSSS"},
207 	{"5.5", "BPSK CCK"},
208 	{"11", "QPSK CCK"},
209 	{"6", "BPSK 1/2"},
210 	{"9", "BPSK 1/2"},
211 	{"12", "QPSK 1/2"},
212 	{"18", "QPSK 3/4"},
213 	{"24", "16QAM 1/2"},
214 	{"36", "16QAM 3/4"},
215 	{"48", "64QAM 2/3"},
216 	{"54", "64QAM 3/4"},
217 	{"60", "64QAM 5/6"},
218 };
219 
220 #define MCS_IDX_PER_STREAM	(8)
221 
222 static inline u8
223 il4965_rs_extract_rate(u32 rate_n_flags)
224 {
225 	return (u8) (rate_n_flags & 0xFF);
226 }
227 
228 static void
229 il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
230 {
231 	win->data = 0;
232 	win->success_counter = 0;
233 	win->success_ratio = IL_INVALID_VALUE;
234 	win->counter = 0;
235 	win->average_tpt = IL_INVALID_VALUE;
236 	win->stamp = 0;
237 }
238 
239 static inline u8
240 il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
241 {
242 	return (ant_type & valid_antenna) == ant_type;
243 }
244 
245 /*
246  *	removes the old data from the stats. All data that is older than
247  *	TID_MAX_TIME_DIFF, will be deleted.
248  */
249 static void
250 il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)
251 {
252 	/* The oldest age we want to keep */
253 	u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
254 
255 	while (tl->queue_count && tl->time_stamp < oldest_time) {
256 		tl->total -= tl->packet_count[tl->head];
257 		tl->packet_count[tl->head] = 0;
258 		tl->time_stamp += TID_QUEUE_CELL_SPACING;
259 		tl->queue_count--;
260 		tl->head++;
261 		if (tl->head >= TID_QUEUE_MAX_SIZE)
262 			tl->head = 0;
263 	}
264 }
265 
266 /*
267  *	increment traffic load value for tid and also remove
268  *	any old values if passed the certain time period
269  */
270 static u8
271 il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
272 {
273 	u32 curr_time = jiffies_to_msecs(jiffies);
274 	u32 time_diff;
275 	s32 idx;
276 	struct il_traffic_load *tl = NULL;
277 	u8 tid;
278 
279 	if (ieee80211_is_data_qos(hdr->frame_control)) {
280 		u8 *qc = ieee80211_get_qos_ctl(hdr);
281 		tid = qc[0] & 0xf;
282 	} else
283 		return MAX_TID_COUNT;
284 
285 	if (unlikely(tid >= TID_MAX_LOAD_COUNT))
286 		return MAX_TID_COUNT;
287 
288 	tl = &lq_data->load[tid];
289 
290 	curr_time -= curr_time % TID_ROUND_VALUE;
291 
292 	/* Happens only for the first packet. Initialize the data */
293 	if (!(tl->queue_count)) {
294 		tl->total = 1;
295 		tl->time_stamp = curr_time;
296 		tl->queue_count = 1;
297 		tl->head = 0;
298 		tl->packet_count[0] = 1;
299 		return MAX_TID_COUNT;
300 	}
301 
302 	time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
303 	idx = time_diff / TID_QUEUE_CELL_SPACING;
304 
305 	/* The history is too long: remove data that is older than */
306 	/* TID_MAX_TIME_DIFF */
307 	if (idx >= TID_QUEUE_MAX_SIZE)
308 		il4965_rs_tl_rm_old_stats(tl, curr_time);
309 
310 	idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
311 	tl->packet_count[idx] = tl->packet_count[idx] + 1;
312 	tl->total = tl->total + 1;
313 
314 	if ((idx + 1) > tl->queue_count)
315 		tl->queue_count = idx + 1;
316 
317 	return tid;
318 }
319 
320 /*
321 	get the traffic load value for tid
322 */
323 static u32
324 il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
325 {
326 	u32 curr_time = jiffies_to_msecs(jiffies);
327 	u32 time_diff;
328 	s32 idx;
329 	struct il_traffic_load *tl = NULL;
330 
331 	if (tid >= TID_MAX_LOAD_COUNT)
332 		return 0;
333 
334 	tl = &(lq_data->load[tid]);
335 
336 	curr_time -= curr_time % TID_ROUND_VALUE;
337 
338 	if (!(tl->queue_count))
339 		return 0;
340 
341 	time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
342 	idx = time_diff / TID_QUEUE_CELL_SPACING;
343 
344 	/* The history is too long: remove data that is older than */
345 	/* TID_MAX_TIME_DIFF */
346 	if (idx >= TID_QUEUE_MAX_SIZE)
347 		il4965_rs_tl_rm_old_stats(tl, curr_time);
348 
349 	return tl->total;
350 }
351 
352 static int
353 il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
354 				 u8 tid, struct ieee80211_sta *sta)
355 {
356 	int ret = -EAGAIN;
357 	u32 load;
358 
359 	load = il4965_rs_tl_get_load(lq_data, tid);
360 
361 	if (load > IL_AGG_LOAD_THRESHOLD) {
362 		D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);
363 		ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
364 		if (ret == -EAGAIN) {
365 			/*
366 			 * driver and mac80211 is out of sync
367 			 * this might be cause by reloading firmware
368 			 * stop the tx ba session here
369 			 */
370 			IL_ERR("Fail start Tx agg on tid: %d\n", tid);
371 			ieee80211_stop_tx_ba_session(sta, tid);
372 		}
373 	} else
374 		D_HT("Aggregation not enabled for tid %d because load = %u\n",
375 		     tid, load);
376 
377 	return ret;
378 }
379 
380 static void
381 il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
382 			 struct ieee80211_sta *sta)
383 {
384 	if (tid < TID_MAX_LOAD_COUNT)
385 		il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
386 	else
387 		IL_ERR("tid exceeds max load count: %d/%d\n", tid,
388 		       TID_MAX_LOAD_COUNT);
389 }
390 
391 static inline int
392 il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)
393 {
394 	return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
395 	    !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
396 	    !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
397 }
398 
399 /*
400  * Static function to get the expected throughput from an il_scale_tbl_info
401  * that wraps a NULL pointer check
402  */
403 static s32
404 il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
405 {
406 	if (tbl->expected_tpt)
407 		return tbl->expected_tpt[rs_idx];
408 	return 0;
409 }
410 
411 /**
412  * il4965_rs_collect_tx_data - Update the success/failure sliding win
413  *
414  * We keep a sliding win of the last 62 packets transmitted
415  * at this rate.  win->data contains the bitmask of successful
416  * packets.
417  */
418 static int
419 il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
420 			  int attempts, int successes)
421 {
422 	struct il_rate_scale_data *win = NULL;
423 	static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
424 	s32 fail_count, tpt;
425 
426 	if (scale_idx < 0 || scale_idx >= RATE_COUNT)
427 		return -EINVAL;
428 
429 	/* Select win for current tx bit rate */
430 	win = &(tbl->win[scale_idx]);
431 
432 	/* Get expected throughput */
433 	tpt = il4965_get_expected_tpt(tbl, scale_idx);
434 
435 	/*
436 	 * Keep track of only the latest 62 tx frame attempts in this rate's
437 	 * history win; anything older isn't really relevant any more.
438 	 * If we have filled up the sliding win, drop the oldest attempt;
439 	 * if the oldest attempt (highest bit in bitmap) shows "success",
440 	 * subtract "1" from the success counter (this is the main reason
441 	 * we keep these bitmaps!).
442 	 */
443 	while (attempts > 0) {
444 		if (win->counter >= RATE_MAX_WINDOW) {
445 
446 			/* remove earliest */
447 			win->counter = RATE_MAX_WINDOW - 1;
448 
449 			if (win->data & mask) {
450 				win->data &= ~mask;
451 				win->success_counter--;
452 			}
453 		}
454 
455 		/* Increment frames-attempted counter */
456 		win->counter++;
457 
458 		/* Shift bitmap by one frame to throw away oldest history */
459 		win->data <<= 1;
460 
461 		/* Mark the most recent #successes attempts as successful */
462 		if (successes > 0) {
463 			win->success_counter++;
464 			win->data |= 0x1;
465 			successes--;
466 		}
467 
468 		attempts--;
469 	}
470 
471 	/* Calculate current success ratio, avoid divide-by-0! */
472 	if (win->counter > 0)
473 		win->success_ratio =
474 		    128 * (100 * win->success_counter) / win->counter;
475 	else
476 		win->success_ratio = IL_INVALID_VALUE;
477 
478 	fail_count = win->counter - win->success_counter;
479 
480 	/* Calculate average throughput, if we have enough history. */
481 	if (fail_count >= RATE_MIN_FAILURE_TH ||
482 	    win->success_counter >= RATE_MIN_SUCCESS_TH)
483 		win->average_tpt = (win->success_ratio * tpt + 64) / 128;
484 	else
485 		win->average_tpt = IL_INVALID_VALUE;
486 
487 	/* Tag this win as having been updated */
488 	win->stamp = jiffies;
489 
490 	return 0;
491 }
492 
493 /*
494  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
495  */
496 static u32
497 il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
498 			     int idx, u8 use_green)
499 {
500 	u32 rate_n_flags = 0;
501 
502 	if (is_legacy(tbl->lq_type)) {
503 		rate_n_flags = il_rates[idx].plcp;
504 		if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
505 			rate_n_flags |= RATE_MCS_CCK_MSK;
506 
507 	} else if (is_Ht(tbl->lq_type)) {
508 		if (idx > IL_LAST_OFDM_RATE) {
509 			IL_ERR("Invalid HT rate idx %d\n", idx);
510 			idx = IL_LAST_OFDM_RATE;
511 		}
512 		rate_n_flags = RATE_MCS_HT_MSK;
513 
514 		if (is_siso(tbl->lq_type))
515 			rate_n_flags |= il_rates[idx].plcp_siso;
516 		else
517 			rate_n_flags |= il_rates[idx].plcp_mimo2;
518 	} else {
519 		IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);
520 	}
521 
522 	rate_n_flags |=
523 	    ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);
524 
525 	if (is_Ht(tbl->lq_type)) {
526 		if (tbl->is_ht40) {
527 			if (tbl->is_dup)
528 				rate_n_flags |= RATE_MCS_DUP_MSK;
529 			else
530 				rate_n_flags |= RATE_MCS_HT40_MSK;
531 		}
532 		if (tbl->is_SGI)
533 			rate_n_flags |= RATE_MCS_SGI_MSK;
534 
535 		if (use_green) {
536 			rate_n_flags |= RATE_MCS_GF_MSK;
537 			if (is_siso(tbl->lq_type) && tbl->is_SGI) {
538 				rate_n_flags &= ~RATE_MCS_SGI_MSK;
539 				IL_ERR("GF was set with SGI:SISO\n");
540 			}
541 		}
542 	}
543 	return rate_n_flags;
544 }
545 
546 /*
547  * Interpret uCode API's rate_n_flags format,
548  * fill "search" or "active" tx mode table.
549  */
550 static int
551 il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
552 				enum nl80211_band band,
553 				struct il_scale_tbl_info *tbl, int *rate_idx)
554 {
555 	u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
556 	u8 il4965_num_of_ant =
557 	    il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
558 	u8 mcs;
559 
560 	memset(tbl, 0, sizeof(struct il_scale_tbl_info));
561 	*rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
562 
563 	if (*rate_idx == RATE_INVALID) {
564 		*rate_idx = -1;
565 		return -EINVAL;
566 	}
567 	tbl->is_SGI = 0;	/* default legacy setup */
568 	tbl->is_ht40 = 0;
569 	tbl->is_dup = 0;
570 	tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
571 	tbl->lq_type = LQ_NONE;
572 	tbl->max_search = IL_MAX_SEARCH;
573 
574 	/* legacy rate format */
575 	if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
576 		if (il4965_num_of_ant == 1) {
577 			if (band == NL80211_BAND_5GHZ)
578 				tbl->lq_type = LQ_A;
579 			else
580 				tbl->lq_type = LQ_G;
581 		}
582 		/* HT rate format */
583 	} else {
584 		if (rate_n_flags & RATE_MCS_SGI_MSK)
585 			tbl->is_SGI = 1;
586 
587 		if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
588 		    (rate_n_flags & RATE_MCS_DUP_MSK))
589 			tbl->is_ht40 = 1;
590 
591 		if (rate_n_flags & RATE_MCS_DUP_MSK)
592 			tbl->is_dup = 1;
593 
594 		mcs = il4965_rs_extract_rate(rate_n_flags);
595 
596 		/* SISO */
597 		if (mcs <= RATE_SISO_60M_PLCP) {
598 			if (il4965_num_of_ant == 1)
599 				tbl->lq_type = LQ_SISO;	/*else NONE */
600 			/* MIMO2 */
601 		} else {
602 			if (il4965_num_of_ant == 2)
603 				tbl->lq_type = LQ_MIMO2;
604 		}
605 	}
606 	return 0;
607 }
608 
609 /* switch to another antenna/antennas and return 1 */
610 /* if no other valid antenna found, return 0 */
611 static int
612 il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
613 			 struct il_scale_tbl_info *tbl)
614 {
615 	u8 new_ant_type;
616 
617 	if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
618 		return 0;
619 
620 	if (!il4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
621 		return 0;
622 
623 	new_ant_type = ant_toggle_lookup[tbl->ant_type];
624 
625 	while (new_ant_type != tbl->ant_type &&
626 	       !il4965_rs_is_valid_ant(valid_ant, new_ant_type))
627 		new_ant_type = ant_toggle_lookup[new_ant_type];
628 
629 	if (new_ant_type == tbl->ant_type)
630 		return 0;
631 
632 	tbl->ant_type = new_ant_type;
633 	*rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
634 	*rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
635 	return 1;
636 }
637 
638 /**
639  * Green-field mode is valid if the station supports it and
640  * there are no non-GF stations present in the BSS.
641  */
642 static bool
643 il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
644 {
645 	return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
646 	       !il->ht.non_gf_sta_present;
647 }
648 
649 /**
650  * il4965_rs_get_supported_rates - get the available rates
651  *
652  * if management frame or broadcast frame only return
653  * basic available rates.
654  *
655  */
656 static u16
657 il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
658 			      struct ieee80211_hdr *hdr,
659 			      enum il_table_type rate_type)
660 {
661 	if (is_legacy(rate_type)) {
662 		return lq_sta->active_legacy_rate;
663 	} else {
664 		if (is_siso(rate_type))
665 			return lq_sta->active_siso_rate;
666 		else
667 			return lq_sta->active_mimo2_rate;
668 	}
669 }
670 
671 static u16
672 il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
673 			    int rate_type)
674 {
675 	u8 high = RATE_INVALID;
676 	u8 low = RATE_INVALID;
677 
678 	/* 802.11A or ht walks to the next literal adjacent rate in
679 	 * the rate table */
680 	if (is_a_band(rate_type) || !is_legacy(rate_type)) {
681 		int i;
682 		u32 mask;
683 
684 		/* Find the previous rate that is in the rate mask */
685 		i = idx - 1;
686 		for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
687 			if (rate_mask & mask) {
688 				low = i;
689 				break;
690 			}
691 		}
692 
693 		/* Find the next rate that is in the rate mask */
694 		i = idx + 1;
695 		for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
696 			if (rate_mask & mask) {
697 				high = i;
698 				break;
699 			}
700 		}
701 
702 		return (high << 8) | low;
703 	}
704 
705 	low = idx;
706 	while (low != RATE_INVALID) {
707 		low = il_rates[low].prev_rs;
708 		if (low == RATE_INVALID)
709 			break;
710 		if (rate_mask & (1 << low))
711 			break;
712 		D_RATE("Skipping masked lower rate: %d\n", low);
713 	}
714 
715 	high = idx;
716 	while (high != RATE_INVALID) {
717 		high = il_rates[high].next_rs;
718 		if (high == RATE_INVALID)
719 			break;
720 		if (rate_mask & (1 << high))
721 			break;
722 		D_RATE("Skipping masked higher rate: %d\n", high);
723 	}
724 
725 	return (high << 8) | low;
726 }
727 
728 static u32
729 il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
730 			 struct il_scale_tbl_info *tbl, u8 scale_idx,
731 			 u8 ht_possible)
732 {
733 	s32 low;
734 	u16 rate_mask;
735 	u16 high_low;
736 	u8 switch_to_legacy = 0;
737 	u8 is_green = lq_sta->is_green;
738 	struct il_priv *il = lq_sta->drv;
739 
740 	/* check if we need to switch from HT to legacy rates.
741 	 * assumption is that mandatory rates (1Mbps or 6Mbps)
742 	 * are always supported (spec demand) */
743 	if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {
744 		switch_to_legacy = 1;
745 		scale_idx = rs_ht_to_legacy[scale_idx];
746 		if (lq_sta->band == NL80211_BAND_5GHZ)
747 			tbl->lq_type = LQ_A;
748 		else
749 			tbl->lq_type = LQ_G;
750 
751 		if (il4965_num_of_ant(tbl->ant_type) > 1)
752 			tbl->ant_type =
753 			    il4965_first_antenna(il->hw_params.valid_tx_ant);
754 
755 		tbl->is_ht40 = 0;
756 		tbl->is_SGI = 0;
757 		tbl->max_search = IL_MAX_SEARCH;
758 	}
759 
760 	rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
761 
762 	/* Mask with station rate restriction */
763 	if (is_legacy(tbl->lq_type)) {
764 		/* supp_rates has no CCK bits in A mode */
765 		if (lq_sta->band == NL80211_BAND_5GHZ)
766 			rate_mask =
767 			    (u16) (rate_mask &
768 				   (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
769 		else
770 			rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
771 	}
772 
773 	/* If we switched from HT to legacy, check current rate */
774 	if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
775 		low = scale_idx;
776 		goto out;
777 	}
778 
779 	high_low =
780 	    il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
781 					tbl->lq_type);
782 	low = high_low & 0xff;
783 
784 	if (low == RATE_INVALID)
785 		low = scale_idx;
786 
787 out:
788 	return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
789 }
790 
791 /*
792  * Simple function to compare two rate scale table types
793  */
794 static bool
795 il4965_table_type_matches(struct il_scale_tbl_info *a,
796 			  struct il_scale_tbl_info *b)
797 {
798 	return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
799 		a->is_SGI == b->is_SGI);
800 }
801 
802 /*
803  * mac80211 sends us Tx status
804  */
805 static void
806 il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
807 		    struct ieee80211_sta *sta, void *il_sta,
808 		    struct sk_buff *skb)
809 {
810 	int legacy_success;
811 	int retries;
812 	int rs_idx, mac_idx, i;
813 	struct il_lq_sta *lq_sta = il_sta;
814 	struct il_link_quality_cmd *table;
815 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
816 	struct il_priv *il = (struct il_priv *)il_r;
817 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
818 	enum mac80211_rate_control_flags mac_flags;
819 	u32 tx_rate;
820 	struct il_scale_tbl_info tbl_type;
821 	struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
822 
823 	D_RATE("get frame ack response, update rate scale win\n");
824 
825 	/* Treat uninitialized rate scaling data same as non-existing. */
826 	if (!lq_sta) {
827 		D_RATE("Station rate scaling not created yet.\n");
828 		return;
829 	} else if (!lq_sta->drv) {
830 		D_RATE("Rate scaling not initialized yet.\n");
831 		return;
832 	}
833 
834 	if (!ieee80211_is_data(hdr->frame_control) ||
835 	    (info->flags & IEEE80211_TX_CTL_NO_ACK))
836 		return;
837 
838 	/* This packet was aggregated but doesn't carry status info */
839 	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
840 	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
841 		return;
842 
843 	/*
844 	 * Ignore this Tx frame response if its initial rate doesn't match
845 	 * that of latest Link Quality command.  There may be stragglers
846 	 * from a previous Link Quality command, but we're no longer interested
847 	 * in those; they're either from the "active" mode while we're trying
848 	 * to check "search" mode, or a prior "search" mode after we've moved
849 	 * to a new "search" mode (which might become the new "active" mode).
850 	 */
851 	table = &lq_sta->lq;
852 	tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
853 	il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
854 	if (il->band == NL80211_BAND_5GHZ)
855 		rs_idx -= IL_FIRST_OFDM_RATE;
856 	mac_flags = info->status.rates[0].flags;
857 	mac_idx = info->status.rates[0].idx;
858 	/* For HT packets, map MCS to PLCP */
859 	if (mac_flags & IEEE80211_TX_RC_MCS) {
860 		mac_idx &= RATE_MCS_CODE_MSK;	/* Remove # of streams */
861 		if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
862 			mac_idx++;
863 		/*
864 		 * mac80211 HT idx is always zero-idxed; we need to move
865 		 * HT OFDM rates after CCK rates in 2.4 GHz band
866 		 */
867 		if (il->band == NL80211_BAND_2GHZ)
868 			mac_idx += IL_FIRST_OFDM_RATE;
869 	}
870 	/* Here we actually compare this rate to the latest LQ command */
871 	if (mac_idx < 0 ||
872 	    tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
873 	    tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
874 	    tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
875 	    tbl_type.ant_type != info->status.antenna ||
876 	    !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
877 	    || !!(tx_rate & RATE_MCS_GF_MSK) !=
878 	    !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
879 		D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
880 		       rs_idx, tx_rate);
881 		/*
882 		 * Since rates mis-match, the last LQ command may have failed.
883 		 * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
884 		 * ... driver.
885 		 */
886 		lq_sta->missed_rate_counter++;
887 		if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
888 			lq_sta->missed_rate_counter = 0;
889 			il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
890 		}
891 		/* Regardless, ignore this status info for outdated rate */
892 		return;
893 	} else
894 		/* Rate did match, so reset the missed_rate_counter */
895 		lq_sta->missed_rate_counter = 0;
896 
897 	/* Figure out if rate scale algorithm is in active or search table */
898 	if (il4965_table_type_matches
899 	    (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {
900 		curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
901 		other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
902 	} else
903 	    if (il4965_table_type_matches
904 		(&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
905 		curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
906 		other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
907 	} else {
908 		D_RATE("Neither active nor search matches tx rate\n");
909 		tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
910 		D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
911 		       tmp_tbl->ant_type, tmp_tbl->is_SGI);
912 		tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
913 		D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
914 		       tmp_tbl->ant_type, tmp_tbl->is_SGI);
915 		D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
916 		       tbl_type.ant_type, tbl_type.is_SGI);
917 		/*
918 		 * no matching table found, let's by-pass the data collection
919 		 * and continue to perform rate scale to find the rate table
920 		 */
921 		il4965_rs_stay_in_table(lq_sta, true);
922 		goto done;
923 	}
924 
925 	/*
926 	 * Updating the frame history depends on whether packets were
927 	 * aggregated.
928 	 *
929 	 * For aggregation, all packets were transmitted at the same rate, the
930 	 * first idx into rate scale table.
931 	 */
932 	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
933 		tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
934 		il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
935 						&rs_idx);
936 		il4965_rs_collect_tx_data(curr_tbl, rs_idx,
937 					  info->status.ampdu_len,
938 					  info->status.ampdu_ack_len);
939 
940 		/* Update success/fail counts if not searching for new mode */
941 		if (lq_sta->stay_in_tbl) {
942 			lq_sta->total_success += info->status.ampdu_ack_len;
943 			lq_sta->total_failed +=
944 			    (info->status.ampdu_len -
945 			     info->status.ampdu_ack_len);
946 		}
947 	} else {
948 		/*
949 		 * For legacy, update frame history with for each Tx retry.
950 		 */
951 		retries = info->status.rates[0].count - 1;
952 		/* HW doesn't send more than 15 retries */
953 		retries = min(retries, 15);
954 
955 		/* The last transmission may have been successful */
956 		legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
957 		/* Collect data for each rate used during failed TX attempts */
958 		for (i = 0; i <= retries; ++i) {
959 			tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
960 			il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
961 							&tbl_type, &rs_idx);
962 			/*
963 			 * Only collect stats if retried rate is in the same RS
964 			 * table as active/search.
965 			 */
966 			if (il4965_table_type_matches(&tbl_type, curr_tbl))
967 				tmp_tbl = curr_tbl;
968 			else if (il4965_table_type_matches
969 				 (&tbl_type, other_tbl))
970 				tmp_tbl = other_tbl;
971 			else
972 				continue;
973 			il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,
974 						  i <
975 						  retries ? 0 : legacy_success);
976 		}
977 
978 		/* Update success/fail counts if not searching for new mode */
979 		if (lq_sta->stay_in_tbl) {
980 			lq_sta->total_success += legacy_success;
981 			lq_sta->total_failed += retries + (1 - legacy_success);
982 		}
983 	}
984 	/* The last TX rate is cached in lq_sta; it's set in if/else above */
985 	lq_sta->last_rate_n_flags = tx_rate;
986 done:
987 	/* See if there's a better rate or modulation mode to try. */
988 	if (sta->supp_rates[sband->band])
989 		il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
990 }
991 
992 /*
993  * Begin a period of staying with a selected modulation mode.
994  * Set "stay_in_tbl" flag to prevent any mode switches.
995  * Set frame tx success limits according to legacy vs. high-throughput,
996  * and reset overall (spanning all rates) tx success history stats.
997  * These control how long we stay using same modulation mode before
998  * searching for a new mode.
999  */
1000 static void
1001 il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
1002 			    struct il_lq_sta *lq_sta)
1003 {
1004 	D_RATE("we are staying in the same table\n");
1005 	lq_sta->stay_in_tbl = 1;	/* only place this gets set */
1006 	if (is_legacy) {
1007 		lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
1008 		lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
1009 		lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
1010 	} else {
1011 		lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
1012 		lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
1013 		lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
1014 	}
1015 	lq_sta->table_count = 0;
1016 	lq_sta->total_failed = 0;
1017 	lq_sta->total_success = 0;
1018 	lq_sta->flush_timer = jiffies;
1019 	lq_sta->action_counter = 0;
1020 }
1021 
1022 /*
1023  * Find correct throughput table for given mode of modulation
1024  */
1025 static void
1026 il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
1027 				 struct il_scale_tbl_info *tbl)
1028 {
1029 	/* Used to choose among HT tables */
1030 	s32(*ht_tbl_pointer)[RATE_COUNT];
1031 
1032 	/* Check for invalid LQ type */
1033 	if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1034 		tbl->expected_tpt = expected_tpt_legacy;
1035 		return;
1036 	}
1037 
1038 	/* Legacy rates have only one table */
1039 	if (is_legacy(tbl->lq_type)) {
1040 		tbl->expected_tpt = expected_tpt_legacy;
1041 		return;
1042 	}
1043 
1044 	/* Choose among many HT tables depending on number of streams
1045 	 * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1046 	 * status */
1047 	if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1048 		ht_tbl_pointer = expected_tpt_siso20MHz;
1049 	else if (is_siso(tbl->lq_type))
1050 		ht_tbl_pointer = expected_tpt_siso40MHz;
1051 	else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1052 		ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1053 	else			/* if (is_mimo2(tbl->lq_type)) <-- must be true */
1054 		ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1055 
1056 	if (!tbl->is_SGI && !lq_sta->is_agg)	/* Normal */
1057 		tbl->expected_tpt = ht_tbl_pointer[0];
1058 	else if (tbl->is_SGI && !lq_sta->is_agg)	/* SGI */
1059 		tbl->expected_tpt = ht_tbl_pointer[1];
1060 	else if (!tbl->is_SGI && lq_sta->is_agg)	/* AGG */
1061 		tbl->expected_tpt = ht_tbl_pointer[2];
1062 	else			/* AGG+SGI */
1063 		tbl->expected_tpt = ht_tbl_pointer[3];
1064 }
1065 
1066 /*
1067  * Find starting rate for new "search" high-throughput mode of modulation.
1068  * Goal is to find lowest expected rate (under perfect conditions) that is
1069  * above the current measured throughput of "active" mode, to give new mode
1070  * a fair chance to prove itself without too many challenges.
1071  *
1072  * This gets called when transitioning to more aggressive modulation
1073  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1074  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1075  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1076  * bit rate will typically need to increase, but not if performance was bad.
1077  */
1078 static s32
1079 il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
1080 			struct il_scale_tbl_info *tbl,	/* "search" */
1081 			u16 rate_mask, s8 idx)
1082 {
1083 	/* "active" values */
1084 	struct il_scale_tbl_info *active_tbl =
1085 	    &(lq_sta->lq_info[lq_sta->active_tbl]);
1086 	s32 active_sr = active_tbl->win[idx].success_ratio;
1087 	s32 active_tpt = active_tbl->expected_tpt[idx];
1088 
1089 	/* expected "search" throughput */
1090 	s32 *tpt_tbl = tbl->expected_tpt;
1091 
1092 	s32 new_rate, high, low, start_hi;
1093 	u16 high_low;
1094 	s8 rate = idx;
1095 
1096 	new_rate = high = low = start_hi = RATE_INVALID;
1097 
1098 	for (;;) {
1099 		high_low =
1100 		    il4965_rs_get_adjacent_rate(il, rate, rate_mask,
1101 						tbl->lq_type);
1102 
1103 		low = high_low & 0xff;
1104 		high = (high_low >> 8) & 0xff;
1105 
1106 		/*
1107 		 * Lower the "search" bit rate, to give new "search" mode
1108 		 * approximately the same throughput as "active" if:
1109 		 *
1110 		 * 1) "Active" mode has been working modestly well (but not
1111 		 *    great), and expected "search" throughput (under perfect
1112 		 *    conditions) at candidate rate is above the actual
1113 		 *    measured "active" throughput (but less than expected
1114 		 *    "active" throughput under perfect conditions).
1115 		 * OR
1116 		 * 2) "Active" mode has been working perfectly or very well
1117 		 *    and expected "search" throughput (under perfect
1118 		 *    conditions) at candidate rate is above expected
1119 		 *    "active" throughput (under perfect conditions).
1120 		 */
1121 		if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
1122 		     (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
1123 		      && tpt_tbl[rate] <= active_tpt)) ||
1124 		    (active_sr >= RATE_SCALE_SWITCH &&
1125 		     tpt_tbl[rate] > active_tpt)) {
1126 
1127 			/* (2nd or later pass)
1128 			 * If we've already tried to raise the rate, and are
1129 			 * now trying to lower it, use the higher rate. */
1130 			if (start_hi != RATE_INVALID) {
1131 				new_rate = start_hi;
1132 				break;
1133 			}
1134 
1135 			new_rate = rate;
1136 
1137 			/* Loop again with lower rate */
1138 			if (low != RATE_INVALID)
1139 				rate = low;
1140 
1141 			/* Lower rate not available, use the original */
1142 			else
1143 				break;
1144 
1145 			/* Else try to raise the "search" rate to match "active" */
1146 		} else {
1147 			/* (2nd or later pass)
1148 			 * If we've already tried to lower the rate, and are
1149 			 * now trying to raise it, use the lower rate. */
1150 			if (new_rate != RATE_INVALID)
1151 				break;
1152 
1153 			/* Loop again with higher rate */
1154 			else if (high != RATE_INVALID) {
1155 				start_hi = high;
1156 				rate = high;
1157 
1158 				/* Higher rate not available, use the original */
1159 			} else {
1160 				new_rate = rate;
1161 				break;
1162 			}
1163 		}
1164 	}
1165 
1166 	return new_rate;
1167 }
1168 
1169 /*
1170  * Set up search table for MIMO2
1171  */
1172 static int
1173 il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
1174 			  struct ieee80211_conf *conf,
1175 			  struct ieee80211_sta *sta,
1176 			  struct il_scale_tbl_info *tbl, int idx)
1177 {
1178 	u16 rate_mask;
1179 	s32 rate;
1180 	s8 is_green = lq_sta->is_green;
1181 
1182 	if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1183 		return -1;
1184 
1185 	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1186 		return -1;
1187 
1188 	/* Need both Tx chains/antennas to support MIMO */
1189 	if (il->hw_params.tx_chains_num < 2)
1190 		return -1;
1191 
1192 	D_RATE("LQ: try to switch to MIMO2\n");
1193 
1194 	tbl->lq_type = LQ_MIMO2;
1195 	tbl->is_dup = lq_sta->is_dup;
1196 	tbl->action = 0;
1197 	tbl->max_search = IL_MAX_SEARCH;
1198 	rate_mask = lq_sta->active_mimo2_rate;
1199 
1200 	if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1201 		tbl->is_ht40 = 1;
1202 	else
1203 		tbl->is_ht40 = 0;
1204 
1205 	il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1206 
1207 	rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1208 
1209 	D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1210 	if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1211 		D_RATE("Can't switch with idx %d rate mask %x\n", rate,
1212 		       rate_mask);
1213 		return -1;
1214 	}
1215 	tbl->current_rate =
1216 	    il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1217 
1218 	D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1219 	       is_green);
1220 	return 0;
1221 }
1222 
1223 /*
1224  * Set up search table for SISO
1225  */
1226 static int
1227 il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
1228 			 struct ieee80211_conf *conf, struct ieee80211_sta *sta,
1229 			 struct il_scale_tbl_info *tbl, int idx)
1230 {
1231 	u16 rate_mask;
1232 	u8 is_green = lq_sta->is_green;
1233 	s32 rate;
1234 
1235 	if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1236 		return -1;
1237 
1238 	D_RATE("LQ: try to switch to SISO\n");
1239 
1240 	tbl->is_dup = lq_sta->is_dup;
1241 	tbl->lq_type = LQ_SISO;
1242 	tbl->action = 0;
1243 	tbl->max_search = IL_MAX_SEARCH;
1244 	rate_mask = lq_sta->active_siso_rate;
1245 
1246 	if (il_is_ht40_tx_allowed(il, &sta->ht_cap))
1247 		tbl->is_ht40 = 1;
1248 	else
1249 		tbl->is_ht40 = 0;
1250 
1251 	if (is_green)
1252 		tbl->is_SGI = 0;	/*11n spec: no SGI in SISO+Greenfield */
1253 
1254 	il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1255 	rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1256 
1257 	D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1258 	if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1259 		D_RATE("can not switch with idx %d rate mask %x\n", rate,
1260 		       rate_mask);
1261 		return -1;
1262 	}
1263 	tbl->current_rate =
1264 	    il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
1265 	D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1266 	       is_green);
1267 	return 0;
1268 }
1269 
1270 /*
1271  * Try to switch to new modulation mode from legacy
1272  */
1273 static int
1274 il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1275 			    struct ieee80211_conf *conf,
1276 			    struct ieee80211_sta *sta, int idx)
1277 {
1278 	struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1279 	struct il_scale_tbl_info *search_tbl =
1280 	    &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1281 	struct il_rate_scale_data *win = &(tbl->win[idx]);
1282 	u32 sz =
1283 	    (sizeof(struct il_scale_tbl_info) -
1284 	     (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1285 	u8 start_action;
1286 	u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1287 	u8 tx_chains_num = il->hw_params.tx_chains_num;
1288 	int ret = 0;
1289 	u8 update_search_tbl_counter = 0;
1290 
1291 	tbl->action = IL_LEGACY_SWITCH_SISO;
1292 
1293 	start_action = tbl->action;
1294 	for (;;) {
1295 		lq_sta->action_counter++;
1296 		switch (tbl->action) {
1297 		case IL_LEGACY_SWITCH_ANTENNA1:
1298 		case IL_LEGACY_SWITCH_ANTENNA2:
1299 			D_RATE("LQ: Legacy toggle Antenna\n");
1300 
1301 			if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
1302 			     tx_chains_num <= 1) ||
1303 			    (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
1304 			     tx_chains_num <= 2))
1305 				break;
1306 
1307 			/* Don't change antenna if success has been great */
1308 			if (win->success_ratio >= IL_RS_GOOD_RATIO)
1309 				break;
1310 
1311 			/* Set up search table to try other antenna */
1312 			memcpy(search_tbl, tbl, sz);
1313 
1314 			if (il4965_rs_toggle_antenna
1315 			    (valid_tx_ant, &search_tbl->current_rate,
1316 			     search_tbl)) {
1317 				update_search_tbl_counter = 1;
1318 				il4965_rs_set_expected_tpt_table(lq_sta,
1319 								 search_tbl);
1320 				goto out;
1321 			}
1322 			break;
1323 		case IL_LEGACY_SWITCH_SISO:
1324 			D_RATE("LQ: Legacy switch to SISO\n");
1325 
1326 			/* Set up search table to try SISO */
1327 			memcpy(search_tbl, tbl, sz);
1328 			search_tbl->is_SGI = 0;
1329 			ret =
1330 			    il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1331 						     search_tbl, idx);
1332 			if (!ret) {
1333 				lq_sta->action_counter = 0;
1334 				goto out;
1335 			}
1336 
1337 			break;
1338 		case IL_LEGACY_SWITCH_MIMO2_AB:
1339 		case IL_LEGACY_SWITCH_MIMO2_AC:
1340 		case IL_LEGACY_SWITCH_MIMO2_BC:
1341 			D_RATE("LQ: Legacy switch to MIMO2\n");
1342 
1343 			/* Set up search table to try MIMO */
1344 			memcpy(search_tbl, tbl, sz);
1345 			search_tbl->is_SGI = 0;
1346 
1347 			if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
1348 				search_tbl->ant_type = ANT_AB;
1349 			else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
1350 				search_tbl->ant_type = ANT_AC;
1351 			else
1352 				search_tbl->ant_type = ANT_BC;
1353 
1354 			if (!il4965_rs_is_valid_ant
1355 			    (valid_tx_ant, search_tbl->ant_type))
1356 				break;
1357 
1358 			ret =
1359 			    il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1360 						      search_tbl, idx);
1361 			if (!ret) {
1362 				lq_sta->action_counter = 0;
1363 				goto out;
1364 			}
1365 			break;
1366 		}
1367 		tbl->action++;
1368 		if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1369 			tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1370 
1371 		if (tbl->action == start_action)
1372 			break;
1373 
1374 	}
1375 	search_tbl->lq_type = LQ_NONE;
1376 	return 0;
1377 
1378 out:
1379 	lq_sta->search_better_tbl = 1;
1380 	tbl->action++;
1381 	if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1382 		tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1383 	if (update_search_tbl_counter)
1384 		search_tbl->action = tbl->action;
1385 	return 0;
1386 
1387 }
1388 
1389 /*
1390  * Try to switch to new modulation mode from SISO
1391  */
1392 static int
1393 il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1394 			     struct ieee80211_conf *conf,
1395 			     struct ieee80211_sta *sta, int idx)
1396 {
1397 	u8 is_green = lq_sta->is_green;
1398 	struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1399 	struct il_scale_tbl_info *search_tbl =
1400 	    &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1401 	struct il_rate_scale_data *win = &(tbl->win[idx]);
1402 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1403 	u32 sz =
1404 	    (sizeof(struct il_scale_tbl_info) -
1405 	     (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1406 	u8 start_action;
1407 	u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1408 	u8 tx_chains_num = il->hw_params.tx_chains_num;
1409 	u8 update_search_tbl_counter = 0;
1410 	int ret;
1411 
1412 	start_action = tbl->action;
1413 
1414 	for (;;) {
1415 		lq_sta->action_counter++;
1416 		switch (tbl->action) {
1417 		case IL_SISO_SWITCH_ANTENNA1:
1418 		case IL_SISO_SWITCH_ANTENNA2:
1419 			D_RATE("LQ: SISO toggle Antenna\n");
1420 			if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
1421 			     tx_chains_num <= 1) ||
1422 			    (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
1423 			     tx_chains_num <= 2))
1424 				break;
1425 
1426 			if (win->success_ratio >= IL_RS_GOOD_RATIO)
1427 				break;
1428 
1429 			memcpy(search_tbl, tbl, sz);
1430 			if (il4965_rs_toggle_antenna
1431 			    (valid_tx_ant, &search_tbl->current_rate,
1432 			     search_tbl)) {
1433 				update_search_tbl_counter = 1;
1434 				goto out;
1435 			}
1436 			break;
1437 		case IL_SISO_SWITCH_MIMO2_AB:
1438 		case IL_SISO_SWITCH_MIMO2_AC:
1439 		case IL_SISO_SWITCH_MIMO2_BC:
1440 			D_RATE("LQ: SISO switch to MIMO2\n");
1441 			memcpy(search_tbl, tbl, sz);
1442 			search_tbl->is_SGI = 0;
1443 
1444 			if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
1445 				search_tbl->ant_type = ANT_AB;
1446 			else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
1447 				search_tbl->ant_type = ANT_AC;
1448 			else
1449 				search_tbl->ant_type = ANT_BC;
1450 
1451 			if (!il4965_rs_is_valid_ant
1452 			    (valid_tx_ant, search_tbl->ant_type))
1453 				break;
1454 
1455 			ret =
1456 			    il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1457 						      search_tbl, idx);
1458 			if (!ret)
1459 				goto out;
1460 			break;
1461 		case IL_SISO_SWITCH_GI:
1462 			if (!tbl->is_ht40 &&
1463 			    !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1464 				break;
1465 			if (tbl->is_ht40 &&
1466 			    !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1467 				break;
1468 
1469 			D_RATE("LQ: SISO toggle SGI/NGI\n");
1470 
1471 			memcpy(search_tbl, tbl, sz);
1472 			if (is_green) {
1473 				if (!tbl->is_SGI)
1474 					break;
1475 				else
1476 					IL_ERR("SGI was set in GF+SISO\n");
1477 			}
1478 			search_tbl->is_SGI = !tbl->is_SGI;
1479 			il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1480 			if (tbl->is_SGI) {
1481 				s32 tpt = lq_sta->last_tpt / 100;
1482 				if (tpt >= search_tbl->expected_tpt[idx])
1483 					break;
1484 			}
1485 			search_tbl->current_rate =
1486 			    il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1487 							 is_green);
1488 			update_search_tbl_counter = 1;
1489 			goto out;
1490 		}
1491 		tbl->action++;
1492 		if (tbl->action > IL_SISO_SWITCH_GI)
1493 			tbl->action = IL_SISO_SWITCH_ANTENNA1;
1494 
1495 		if (tbl->action == start_action)
1496 			break;
1497 	}
1498 	search_tbl->lq_type = LQ_NONE;
1499 	return 0;
1500 
1501 out:
1502 	lq_sta->search_better_tbl = 1;
1503 	tbl->action++;
1504 	if (tbl->action > IL_SISO_SWITCH_GI)
1505 		tbl->action = IL_SISO_SWITCH_ANTENNA1;
1506 	if (update_search_tbl_counter)
1507 		search_tbl->action = tbl->action;
1508 
1509 	return 0;
1510 }
1511 
1512 /*
1513  * Try to switch to new modulation mode from MIMO2
1514  */
1515 static int
1516 il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1517 			      struct ieee80211_conf *conf,
1518 			      struct ieee80211_sta *sta, int idx)
1519 {
1520 	s8 is_green = lq_sta->is_green;
1521 	struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1522 	struct il_scale_tbl_info *search_tbl =
1523 	    &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1524 	struct il_rate_scale_data *win = &(tbl->win[idx]);
1525 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1526 	u32 sz =
1527 	    (sizeof(struct il_scale_tbl_info) -
1528 	     (sizeof(struct il_rate_scale_data) * RATE_COUNT));
1529 	u8 start_action;
1530 	u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1531 	u8 tx_chains_num = il->hw_params.tx_chains_num;
1532 	u8 update_search_tbl_counter = 0;
1533 	int ret;
1534 
1535 	start_action = tbl->action;
1536 	for (;;) {
1537 		lq_sta->action_counter++;
1538 		switch (tbl->action) {
1539 		case IL_MIMO2_SWITCH_ANTENNA1:
1540 		case IL_MIMO2_SWITCH_ANTENNA2:
1541 			D_RATE("LQ: MIMO2 toggle Antennas\n");
1542 
1543 			if (tx_chains_num <= 2)
1544 				break;
1545 
1546 			if (win->success_ratio >= IL_RS_GOOD_RATIO)
1547 				break;
1548 
1549 			memcpy(search_tbl, tbl, sz);
1550 			if (il4965_rs_toggle_antenna
1551 			    (valid_tx_ant, &search_tbl->current_rate,
1552 			     search_tbl)) {
1553 				update_search_tbl_counter = 1;
1554 				goto out;
1555 			}
1556 			break;
1557 		case IL_MIMO2_SWITCH_SISO_A:
1558 		case IL_MIMO2_SWITCH_SISO_B:
1559 		case IL_MIMO2_SWITCH_SISO_C:
1560 			D_RATE("LQ: MIMO2 switch to SISO\n");
1561 
1562 			/* Set up new search table for SISO */
1563 			memcpy(search_tbl, tbl, sz);
1564 
1565 			if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
1566 				search_tbl->ant_type = ANT_A;
1567 			else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
1568 				search_tbl->ant_type = ANT_B;
1569 			else
1570 				search_tbl->ant_type = ANT_C;
1571 
1572 			if (!il4965_rs_is_valid_ant
1573 			    (valid_tx_ant, search_tbl->ant_type))
1574 				break;
1575 
1576 			ret =
1577 			    il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1578 						     search_tbl, idx);
1579 			if (!ret)
1580 				goto out;
1581 
1582 			break;
1583 
1584 		case IL_MIMO2_SWITCH_GI:
1585 			if (!tbl->is_ht40 &&
1586 			    !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1587 				break;
1588 			if (tbl->is_ht40 &&
1589 			    !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1590 				break;
1591 
1592 			D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
1593 
1594 			/* Set up new search table for MIMO2 */
1595 			memcpy(search_tbl, tbl, sz);
1596 			search_tbl->is_SGI = !tbl->is_SGI;
1597 			il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
1598 			/*
1599 			 * If active table already uses the fastest possible
1600 			 * modulation (dual stream with short guard interval),
1601 			 * and it's working well, there's no need to look
1602 			 * for a better type of modulation!
1603 			 */
1604 			if (tbl->is_SGI) {
1605 				s32 tpt = lq_sta->last_tpt / 100;
1606 				if (tpt >= search_tbl->expected_tpt[idx])
1607 					break;
1608 			}
1609 			search_tbl->current_rate =
1610 			    il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
1611 							 is_green);
1612 			update_search_tbl_counter = 1;
1613 			goto out;
1614 
1615 		}
1616 		tbl->action++;
1617 		if (tbl->action > IL_MIMO2_SWITCH_GI)
1618 			tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1619 
1620 		if (tbl->action == start_action)
1621 			break;
1622 	}
1623 	search_tbl->lq_type = LQ_NONE;
1624 	return 0;
1625 out:
1626 	lq_sta->search_better_tbl = 1;
1627 	tbl->action++;
1628 	if (tbl->action > IL_MIMO2_SWITCH_GI)
1629 		tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1630 	if (update_search_tbl_counter)
1631 		search_tbl->action = tbl->action;
1632 
1633 	return 0;
1634 
1635 }
1636 
1637 /*
1638  * Check whether we should continue using same modulation mode, or
1639  * begin search for a new mode, based on:
1640  * 1) # tx successes or failures while using this mode
1641  * 2) # times calling this function
1642  * 3) elapsed time in this mode (not used, for now)
1643  */
1644 static void
1645 il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
1646 {
1647 	struct il_scale_tbl_info *tbl;
1648 	int i;
1649 	int active_tbl;
1650 	int flush_interval_passed = 0;
1651 	struct il_priv *il;
1652 
1653 	il = lq_sta->drv;
1654 	active_tbl = lq_sta->active_tbl;
1655 
1656 	tbl = &(lq_sta->lq_info[active_tbl]);
1657 
1658 	/* If we've been disallowing search, see if we should now allow it */
1659 	if (lq_sta->stay_in_tbl) {
1660 
1661 		/* Elapsed time using current modulation mode */
1662 		if (lq_sta->flush_timer)
1663 			flush_interval_passed =
1664 			    time_after(jiffies,
1665 				       (unsigned long)(lq_sta->flush_timer +
1666 						       RATE_SCALE_FLUSH_INTVL));
1667 
1668 		/*
1669 		 * Check if we should allow search for new modulation mode.
1670 		 * If many frames have failed or succeeded, or we've used
1671 		 * this same modulation for a long time, allow search, and
1672 		 * reset history stats that keep track of whether we should
1673 		 * allow a new search.  Also (below) reset all bitmaps and
1674 		 * stats in active history.
1675 		 */
1676 		if (force_search ||
1677 		    lq_sta->total_failed > lq_sta->max_failure_limit ||
1678 		    lq_sta->total_success > lq_sta->max_success_limit ||
1679 		    (!lq_sta->search_better_tbl && lq_sta->flush_timer &&
1680 		     flush_interval_passed)) {
1681 			D_RATE("LQ: stay is expired %d %d %d\n",
1682 			       lq_sta->total_failed, lq_sta->total_success,
1683 			       flush_interval_passed);
1684 
1685 			/* Allow search for new mode */
1686 			lq_sta->stay_in_tbl = 0;	/* only place reset */
1687 			lq_sta->total_failed = 0;
1688 			lq_sta->total_success = 0;
1689 			lq_sta->flush_timer = 0;
1690 
1691 			/*
1692 			 * Else if we've used this modulation mode enough repetitions
1693 			 * (regardless of elapsed time or success/failure), reset
1694 			 * history bitmaps and rate-specific stats for all rates in
1695 			 * active table.
1696 			 */
1697 		} else {
1698 			lq_sta->table_count++;
1699 			if (lq_sta->table_count >= lq_sta->table_count_limit) {
1700 				lq_sta->table_count = 0;
1701 
1702 				D_RATE("LQ: stay in table clear win\n");
1703 				for (i = 0; i < RATE_COUNT; i++)
1704 					il4965_rs_rate_scale_clear_win(&
1705 								       (tbl->
1706 									win
1707 									[i]));
1708 			}
1709 		}
1710 
1711 		/* If transitioning to allow "search", reset all history
1712 		 * bitmaps and stats in active table (this will become the new
1713 		 * "search" table). */
1714 		if (!lq_sta->stay_in_tbl) {
1715 			for (i = 0; i < RATE_COUNT; i++)
1716 				il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
1717 		}
1718 	}
1719 }
1720 
1721 /*
1722  * setup rate table in uCode
1723  */
1724 static void
1725 il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
1726 			  struct il_scale_tbl_info *tbl, int idx, u8 is_green)
1727 {
1728 	u32 rate;
1729 
1730 	/* Update uCode's rate table. */
1731 	rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
1732 	il4965_rs_fill_link_cmd(il, lq_sta, rate);
1733 	il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
1734 }
1735 
1736 /*
1737  * Do rate scaling and search for new modulation mode.
1738  */
1739 static void
1740 il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
1741 			     struct ieee80211_sta *sta,
1742 			     struct il_lq_sta *lq_sta)
1743 {
1744 	struct ieee80211_hw *hw = il->hw;
1745 	struct ieee80211_conf *conf = &hw->conf;
1746 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1747 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1748 	int low = RATE_INVALID;
1749 	int high = RATE_INVALID;
1750 	int idx;
1751 	int i;
1752 	struct il_rate_scale_data *win = NULL;
1753 	int current_tpt = IL_INVALID_VALUE;
1754 	int low_tpt = IL_INVALID_VALUE;
1755 	int high_tpt = IL_INVALID_VALUE;
1756 	u32 fail_count;
1757 	s8 scale_action = 0;
1758 	u16 rate_mask;
1759 	u8 update_lq = 0;
1760 	struct il_scale_tbl_info *tbl, *tbl1;
1761 	u16 rate_scale_idx_msk = 0;
1762 	u8 is_green = 0;
1763 	u8 active_tbl = 0;
1764 	u8 done_search = 0;
1765 	u16 high_low;
1766 	s32 sr;
1767 	u8 tid = MAX_TID_COUNT;
1768 	struct il_tid_data *tid_data;
1769 
1770 	D_RATE("rate scale calculate new rate for skb\n");
1771 
1772 	/* Send management frames and NO_ACK data using lowest rate. */
1773 	/* TODO: this could probably be improved.. */
1774 	if (!ieee80211_is_data(hdr->frame_control) ||
1775 	    (info->flags & IEEE80211_TX_CTL_NO_ACK))
1776 		return;
1777 
1778 	lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1779 
1780 	tid = il4965_rs_tl_add_packet(lq_sta, hdr);
1781 	if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1782 		tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
1783 		if (tid_data->agg.state == IL_AGG_OFF)
1784 			lq_sta->is_agg = 0;
1785 		else
1786 			lq_sta->is_agg = 1;
1787 	} else
1788 		lq_sta->is_agg = 0;
1789 
1790 	/*
1791 	 * Select rate-scale / modulation-mode table to work with in
1792 	 * the rest of this function:  "search" if searching for better
1793 	 * modulation mode, or "active" if doing rate scaling within a mode.
1794 	 */
1795 	if (!lq_sta->search_better_tbl)
1796 		active_tbl = lq_sta->active_tbl;
1797 	else
1798 		active_tbl = 1 - lq_sta->active_tbl;
1799 
1800 	tbl = &(lq_sta->lq_info[active_tbl]);
1801 	if (is_legacy(tbl->lq_type))
1802 		lq_sta->is_green = 0;
1803 	else
1804 		lq_sta->is_green = il4965_rs_use_green(il, sta);
1805 	is_green = lq_sta->is_green;
1806 
1807 	/* current tx rate */
1808 	idx = lq_sta->last_txrate_idx;
1809 
1810 	D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
1811 
1812 	/* rates available for this association, and for modulation mode */
1813 	rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1814 
1815 	D_RATE("mask 0x%04X\n", rate_mask);
1816 
1817 	/* mask with station rate restriction */
1818 	if (is_legacy(tbl->lq_type)) {
1819 		if (lq_sta->band == NL80211_BAND_5GHZ)
1820 			/* supp_rates has no CCK bits in A mode */
1821 			rate_scale_idx_msk =
1822 			    (u16) (rate_mask &
1823 				   (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
1824 		else
1825 			rate_scale_idx_msk =
1826 			    (u16) (rate_mask & lq_sta->supp_rates);
1827 
1828 	} else
1829 		rate_scale_idx_msk = rate_mask;
1830 
1831 	if (!rate_scale_idx_msk)
1832 		rate_scale_idx_msk = rate_mask;
1833 
1834 	if (!((1 << idx) & rate_scale_idx_msk)) {
1835 		IL_ERR("Current Rate is not valid\n");
1836 		if (lq_sta->search_better_tbl) {
1837 			/* revert to active table if search table is not valid */
1838 			tbl->lq_type = LQ_NONE;
1839 			lq_sta->search_better_tbl = 0;
1840 			tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1841 			/* get "active" rate info */
1842 			idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1843 			il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
1844 						      is_green);
1845 		}
1846 		return;
1847 	}
1848 
1849 	/* Get expected throughput table and history win for current rate */
1850 	if (!tbl->expected_tpt) {
1851 		IL_ERR("tbl->expected_tpt is NULL\n");
1852 		return;
1853 	}
1854 
1855 	/* force user max rate if set by user */
1856 	if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
1857 		idx = lq_sta->max_rate_idx;
1858 		update_lq = 1;
1859 		win = &(tbl->win[idx]);
1860 		goto lq_update;
1861 	}
1862 
1863 	win = &(tbl->win[idx]);
1864 
1865 	/*
1866 	 * If there is not enough history to calculate actual average
1867 	 * throughput, keep analyzing results of more tx frames, without
1868 	 * changing rate or mode (bypass most of the rest of this function).
1869 	 * Set up new rate table in uCode only if old rate is not supported
1870 	 * in current association (use new rate found above).
1871 	 */
1872 	fail_count = win->counter - win->success_counter;
1873 	if (fail_count < RATE_MIN_FAILURE_TH &&
1874 	    win->success_counter < RATE_MIN_SUCCESS_TH) {
1875 		D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
1876 		       win->success_counter, win->counter, idx);
1877 
1878 		/* Can't calculate this yet; not enough history */
1879 		win->average_tpt = IL_INVALID_VALUE;
1880 
1881 		/* Should we stay with this modulation mode,
1882 		 * or search for a new one? */
1883 		il4965_rs_stay_in_table(lq_sta, false);
1884 
1885 		goto out;
1886 	}
1887 	/* Else we have enough samples; calculate estimate of
1888 	 * actual average throughput */
1889 	if (win->average_tpt !=
1890 	    ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
1891 		IL_ERR("expected_tpt should have been calculated by now\n");
1892 		win->average_tpt =
1893 		    ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
1894 	}
1895 
1896 	/* If we are searching for better modulation mode, check success. */
1897 	if (lq_sta->search_better_tbl) {
1898 		/* If good success, continue using the "search" mode;
1899 		 * no need to send new link quality command, since we're
1900 		 * continuing to use the setup that we've been trying. */
1901 		if (win->average_tpt > lq_sta->last_tpt) {
1902 
1903 			D_RATE("LQ: SWITCHING TO NEW TBL "
1904 			       "suc=%d cur-tpt=%d old-tpt=%d\n",
1905 			       win->success_ratio, win->average_tpt,
1906 			       lq_sta->last_tpt);
1907 
1908 			if (!is_legacy(tbl->lq_type))
1909 				lq_sta->enable_counter = 1;
1910 
1911 			/* Swap tables; "search" becomes "active" */
1912 			lq_sta->active_tbl = active_tbl;
1913 			current_tpt = win->average_tpt;
1914 
1915 			/* Else poor success; go back to mode in "active" table */
1916 		} else {
1917 
1918 			D_RATE("LQ: GOING BACK TO THE OLD TBL "
1919 			       "suc=%d cur-tpt=%d old-tpt=%d\n",
1920 			       win->success_ratio, win->average_tpt,
1921 			       lq_sta->last_tpt);
1922 
1923 			/* Nullify "search" table */
1924 			tbl->lq_type = LQ_NONE;
1925 
1926 			/* Revert to "active" table */
1927 			active_tbl = lq_sta->active_tbl;
1928 			tbl = &(lq_sta->lq_info[active_tbl]);
1929 
1930 			/* Revert to "active" rate and throughput info */
1931 			idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
1932 			current_tpt = lq_sta->last_tpt;
1933 
1934 			/* Need to set up a new rate table in uCode */
1935 			update_lq = 1;
1936 		}
1937 
1938 		/* Either way, we've made a decision; modulation mode
1939 		 * search is done, allow rate adjustment next time. */
1940 		lq_sta->search_better_tbl = 0;
1941 		done_search = 1;	/* Don't switch modes below! */
1942 		goto lq_update;
1943 	}
1944 
1945 	/* (Else) not in search of better modulation mode, try for better
1946 	 * starting rate, while staying in this mode. */
1947 	high_low =
1948 	    il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,
1949 					tbl->lq_type);
1950 	low = high_low & 0xff;
1951 	high = (high_low >> 8) & 0xff;
1952 
1953 	/* If user set max rate, dont allow higher than user constrain */
1954 	if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
1955 		high = RATE_INVALID;
1956 
1957 	sr = win->success_ratio;
1958 
1959 	/* Collect measured throughputs for current and adjacent rates */
1960 	current_tpt = win->average_tpt;
1961 	if (low != RATE_INVALID)
1962 		low_tpt = tbl->win[low].average_tpt;
1963 	if (high != RATE_INVALID)
1964 		high_tpt = tbl->win[high].average_tpt;
1965 
1966 	scale_action = 0;
1967 
1968 	/* Too many failures, decrease rate */
1969 	if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
1970 		D_RATE("decrease rate because of low success_ratio\n");
1971 		scale_action = -1;
1972 
1973 		/* No throughput measured yet for adjacent rates; try increase. */
1974 	} else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
1975 
1976 		if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
1977 			scale_action = 1;
1978 		else if (low != RATE_INVALID)
1979 			scale_action = 0;
1980 	}
1981 
1982 	/* Both adjacent throughputs are measured, but neither one has better
1983 	 * throughput; we're using the best rate, don't change it! */
1984 	else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
1985 		 low_tpt < current_tpt && high_tpt < current_tpt)
1986 		scale_action = 0;
1987 
1988 	/* At least one adjacent rate's throughput is measured,
1989 	 * and may have better performance. */
1990 	else {
1991 		/* Higher adjacent rate's throughput is measured */
1992 		if (high_tpt != IL_INVALID_VALUE) {
1993 			/* Higher rate has better throughput */
1994 			if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
1995 				scale_action = 1;
1996 			else
1997 				scale_action = 0;
1998 
1999 			/* Lower adjacent rate's throughput is measured */
2000 		} else if (low_tpt != IL_INVALID_VALUE) {
2001 			/* Lower rate has better throughput */
2002 			if (low_tpt > current_tpt) {
2003 				D_RATE("decrease rate because of low tpt\n");
2004 				scale_action = -1;
2005 			} else if (sr >= RATE_INCREASE_TH) {
2006 				scale_action = 1;
2007 			}
2008 		}
2009 	}
2010 
2011 	/* Sanity check; asked for decrease, but success rate or throughput
2012 	 * has been good at old rate.  Don't change it. */
2013 	if (scale_action == -1 && low != RATE_INVALID &&
2014 	    (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
2015 		scale_action = 0;
2016 
2017 	switch (scale_action) {
2018 	case -1:
2019 		/* Decrease starting rate, update uCode's rate table */
2020 		if (low != RATE_INVALID) {
2021 			update_lq = 1;
2022 			idx = low;
2023 		}
2024 
2025 		break;
2026 	case 1:
2027 		/* Increase starting rate, update uCode's rate table */
2028 		if (high != RATE_INVALID) {
2029 			update_lq = 1;
2030 			idx = high;
2031 		}
2032 
2033 		break;
2034 	case 0:
2035 		/* No change */
2036 	default:
2037 		break;
2038 	}
2039 
2040 	D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
2041 	       idx, scale_action, low, high, tbl->lq_type);
2042 
2043 lq_update:
2044 	/* Replace uCode's rate table for the destination station. */
2045 	if (update_lq)
2046 		il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
2047 
2048 	/* Should we stay with this modulation mode,
2049 	 * or search for a new one? */
2050 	il4965_rs_stay_in_table(lq_sta, false);
2051 
2052 	/*
2053 	 * Search for new modulation mode if we're:
2054 	 * 1)  Not changing rates right now
2055 	 * 2)  Not just finishing up a search
2056 	 * 3)  Allowing a new search
2057 	 */
2058 	if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
2059 		/* Save current throughput to compare with "search" throughput */
2060 		lq_sta->last_tpt = current_tpt;
2061 
2062 		/* Select a new "search" modulation mode to try.
2063 		 * If one is found, set up the new "search" table. */
2064 		if (is_legacy(tbl->lq_type))
2065 			il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
2066 		else if (is_siso(tbl->lq_type))
2067 			il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
2068 						     idx);
2069 		else		/* (is_mimo2(tbl->lq_type)) */
2070 			il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
2071 						      idx);
2072 
2073 		/* If new "search" mode was selected, set up in uCode table */
2074 		if (lq_sta->search_better_tbl) {
2075 			/* Access the "search" table, clear its history. */
2076 			tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2077 			for (i = 0; i < RATE_COUNT; i++)
2078 				il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
2079 
2080 			/* Use new "search" start rate */
2081 			idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
2082 
2083 			D_RATE("Switch current  mcs: %X idx: %d\n",
2084 			       tbl->current_rate, idx);
2085 			il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
2086 			il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
2087 		} else
2088 			done_search = 1;
2089 	}
2090 
2091 	if (done_search && !lq_sta->stay_in_tbl) {
2092 		/* If the "active" (non-search) mode was legacy,
2093 		 * and we've tried switching antennas,
2094 		 * but we haven't been able to try HT modes (not available),
2095 		 * stay with best antenna legacy modulation for a while
2096 		 * before next round of mode comparisons. */
2097 		tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2098 		if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2099 		    lq_sta->action_counter > tbl1->max_search) {
2100 			D_RATE("LQ: STAY in legacy table\n");
2101 			il4965_rs_set_stay_in_table(il, 1, lq_sta);
2102 		}
2103 
2104 		/* If we're in an HT mode, and all 3 mode switch actions
2105 		 * have been tried and compared, stay in this best modulation
2106 		 * mode for a while before next round of mode comparisons. */
2107 		if (lq_sta->enable_counter &&
2108 		    lq_sta->action_counter >= tbl1->max_search) {
2109 			if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
2110 			    (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2111 			    tid != MAX_TID_COUNT) {
2112 				tid_data =
2113 				    &il->stations[lq_sta->lq.sta_id].tid[tid];
2114 				if (tid_data->agg.state == IL_AGG_OFF) {
2115 					D_RATE("try to aggregate tid %d\n",
2116 					       tid);
2117 					il4965_rs_tl_turn_on_agg(il, tid,
2118 								 lq_sta, sta);
2119 				}
2120 			}
2121 			il4965_rs_set_stay_in_table(il, 0, lq_sta);
2122 		}
2123 	}
2124 
2125 out:
2126 	tbl->current_rate =
2127 	    il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
2128 	i = idx;
2129 	lq_sta->last_txrate_idx = i;
2130 }
2131 
2132 /**
2133  * il4965_rs_initialize_lq - Initialize a station's hardware rate table
2134  *
2135  * The uCode's station table contains a table of fallback rates
2136  * for automatic fallback during transmission.
2137  *
2138  * NOTE: This sets up a default set of values.  These will be replaced later
2139  *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2140  *       rc80211_simple.
2141  *
2142  * NOTE: Run C_ADD_STA command to set up station table entry, before
2143  *       calling this function (which runs C_TX_LINK_QUALITY_CMD,
2144  *       which requires station table entry to exist).
2145  */
2146 static void
2147 il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
2148 			struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
2149 {
2150 	struct il_scale_tbl_info *tbl;
2151 	int rate_idx;
2152 	int i;
2153 	u32 rate;
2154 	u8 use_green;
2155 	u8 active_tbl = 0;
2156 	u8 valid_tx_ant;
2157 
2158 	if (!sta || !lq_sta)
2159 		return;
2160 
2161 	use_green = il4965_rs_use_green(il, sta);
2162 
2163 	i = lq_sta->last_txrate_idx;
2164 
2165 	valid_tx_ant = il->hw_params.valid_tx_ant;
2166 
2167 	if (!lq_sta->search_better_tbl)
2168 		active_tbl = lq_sta->active_tbl;
2169 	else
2170 		active_tbl = 1 - lq_sta->active_tbl;
2171 
2172 	tbl = &(lq_sta->lq_info[active_tbl]);
2173 
2174 	if (i < 0 || i >= RATE_COUNT)
2175 		i = 0;
2176 
2177 	rate = il_rates[i].plcp;
2178 	tbl->ant_type = il4965_first_antenna(valid_tx_ant);
2179 	rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2180 
2181 	if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
2182 		rate |= RATE_MCS_CCK_MSK;
2183 
2184 	il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
2185 	if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2186 		il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2187 
2188 	rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
2189 	tbl->current_rate = rate;
2190 	il4965_rs_set_expected_tpt_table(lq_sta, tbl);
2191 	il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
2192 	il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2193 	il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);
2194 }
2195 
2196 static void
2197 il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
2198 		   struct ieee80211_tx_rate_control *txrc)
2199 {
2200 
2201 	struct sk_buff *skb = txrc->skb;
2202 	struct ieee80211_supported_band *sband = txrc->sband;
2203 	struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
2204 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2205 	struct il_lq_sta *lq_sta = il_sta;
2206 	int rate_idx;
2207 
2208 	D_RATE("rate scale calculate new rate for skb\n");
2209 
2210 	/* Get max rate if user set max rate */
2211 	if (lq_sta) {
2212 		lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
2213 		if (sband->band == NL80211_BAND_5GHZ &&
2214 		    lq_sta->max_rate_idx != -1)
2215 			lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
2216 		if (lq_sta->max_rate_idx < 0 ||
2217 		    lq_sta->max_rate_idx >= RATE_COUNT)
2218 			lq_sta->max_rate_idx = -1;
2219 	}
2220 
2221 	/* Treat uninitialized rate scaling data same as non-existing. */
2222 	if (lq_sta && !lq_sta->drv) {
2223 		D_RATE("Rate scaling not initialized yet.\n");
2224 		il_sta = NULL;
2225 	}
2226 
2227 	/* Send management frames and NO_ACK data using lowest rate. */
2228 	if (rate_control_send_low(sta, il_sta, txrc))
2229 		return;
2230 
2231 	if (!lq_sta)
2232 		return;
2233 
2234 	rate_idx = lq_sta->last_txrate_idx;
2235 
2236 	if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2237 		rate_idx -= IL_FIRST_OFDM_RATE;
2238 		/* 6M and 9M shared same MCS idx */
2239 		rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2240 		if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
2241 		    RATE_MIMO2_6M_PLCP)
2242 			rate_idx = rate_idx + MCS_IDX_PER_STREAM;
2243 		info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2244 		if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2245 			info->control.rates[0].flags |=
2246 			    IEEE80211_TX_RC_SHORT_GI;
2247 		if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2248 			info->control.rates[0].flags |=
2249 			    IEEE80211_TX_RC_DUP_DATA;
2250 		if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2251 			info->control.rates[0].flags |=
2252 			    IEEE80211_TX_RC_40_MHZ_WIDTH;
2253 		if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2254 			info->control.rates[0].flags |=
2255 			    IEEE80211_TX_RC_GREEN_FIELD;
2256 	} else {
2257 		/* Check for invalid rates */
2258 		if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
2259 		    (sband->band == NL80211_BAND_5GHZ &&
2260 		     rate_idx < IL_FIRST_OFDM_RATE))
2261 			rate_idx = rate_lowest_index(sband, sta);
2262 		/* On valid 5 GHz rate, adjust idx */
2263 		else if (sband->band == NL80211_BAND_5GHZ)
2264 			rate_idx -= IL_FIRST_OFDM_RATE;
2265 		info->control.rates[0].flags = 0;
2266 	}
2267 	info->control.rates[0].idx = rate_idx;
2268 	info->control.rates[0].count = 1;
2269 }
2270 
2271 static void *
2272 il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
2273 {
2274 	struct il_station_priv *sta_priv =
2275 	    (struct il_station_priv *)sta->drv_priv;
2276 	struct il_priv *il;
2277 
2278 	il = (struct il_priv *)il_rate;
2279 	D_RATE("create station rate scale win\n");
2280 
2281 	return &sta_priv->lq_sta;
2282 }
2283 
2284 /*
2285  * Called after adding a new station to initialize rate scaling
2286  */
2287 void
2288 il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
2289 {
2290 	int i, j;
2291 	struct ieee80211_hw *hw = il->hw;
2292 	struct ieee80211_conf *conf = &il->hw->conf;
2293 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2294 	struct il_station_priv *sta_priv;
2295 	struct il_lq_sta *lq_sta;
2296 	struct ieee80211_supported_band *sband;
2297 
2298 	sta_priv = (struct il_station_priv *)sta->drv_priv;
2299 	lq_sta = &sta_priv->lq_sta;
2300 	sband = hw->wiphy->bands[conf->chandef.chan->band];
2301 
2302 	lq_sta->lq.sta_id = sta_id;
2303 
2304 	for (j = 0; j < LQ_SIZE; j++)
2305 		for (i = 0; i < RATE_COUNT; i++)
2306 			il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2307 						       win[i]);
2308 
2309 	lq_sta->flush_timer = 0;
2310 	lq_sta->supp_rates = sta->supp_rates[sband->band];
2311 	for (j = 0; j < LQ_SIZE; j++)
2312 		for (i = 0; i < RATE_COUNT; i++)
2313 			il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
2314 						       win[i]);
2315 
2316 	D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
2317 	       sta_id);
2318 	/* TODO: what is a good starting rate for STA? About middle? Maybe not
2319 	 * the lowest or the highest rate.. Could consider using RSSI from
2320 	 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2321 	 * after assoc.. */
2322 
2323 	lq_sta->is_dup = 0;
2324 	lq_sta->max_rate_idx = -1;
2325 	lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
2326 	lq_sta->is_green = il4965_rs_use_green(il, sta);
2327 	lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
2328 	lq_sta->band = il->band;
2329 	/*
2330 	 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2331 	 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2332 	 */
2333 	lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2334 	lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2335 	lq_sta->active_siso_rate &= ~((u16) 0x2);
2336 	lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
2337 
2338 	/* Same here */
2339 	lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2340 	lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2341 	lq_sta->active_mimo2_rate &= ~((u16) 0x2);
2342 	lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
2343 
2344 	/* These values will be overridden later */
2345 	lq_sta->lq.general_params.single_stream_ant_msk =
2346 	    il4965_first_antenna(il->hw_params.valid_tx_ant);
2347 	lq_sta->lq.general_params.dual_stream_ant_msk =
2348 	    il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
2349 							       valid_tx_ant);
2350 	if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2351 		lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2352 	} else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
2353 		lq_sta->lq.general_params.dual_stream_ant_msk =
2354 		    il->hw_params.valid_tx_ant;
2355 	}
2356 
2357 	/* as default allow aggregation for all tids */
2358 	lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
2359 	lq_sta->drv = il;
2360 
2361 	/* Set last_txrate_idx to lowest rate */
2362 	lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2363 	if (sband->band == NL80211_BAND_5GHZ)
2364 		lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
2365 	lq_sta->is_agg = 0;
2366 
2367 #ifdef CONFIG_MAC80211_DEBUGFS
2368 	lq_sta->dbg_fixed_rate = 0;
2369 #endif
2370 
2371 	il4965_rs_initialize_lq(il, conf, sta, lq_sta);
2372 }
2373 
2374 static void
2375 il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
2376 			u32 new_rate)
2377 {
2378 	struct il_scale_tbl_info tbl_type;
2379 	int idx = 0;
2380 	int rate_idx;
2381 	int repeat_rate = 0;
2382 	u8 ant_toggle_cnt = 0;
2383 	u8 use_ht_possible = 1;
2384 	u8 valid_tx_ant = 0;
2385 	struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
2386 
2387 	/* Override starting rate (idx 0) if needed for debug purposes */
2388 	il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2389 
2390 	/* Interpret new_rate (rate_n_flags) */
2391 	il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2392 					&rate_idx);
2393 
2394 	/* How many times should we repeat the initial rate? */
2395 	if (is_legacy(tbl_type.lq_type)) {
2396 		ant_toggle_cnt = 1;
2397 		repeat_rate = IL_NUMBER_TRY;
2398 	} else {
2399 		repeat_rate = IL_HT_NUMBER_TRY;
2400 	}
2401 
2402 	lq_cmd->general_params.mimo_delimiter =
2403 	    is_mimo(tbl_type.lq_type) ? 1 : 0;
2404 
2405 	/* Fill 1st table entry (idx 0) */
2406 	lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2407 
2408 	if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
2409 		lq_cmd->general_params.single_stream_ant_msk =
2410 		    tbl_type.ant_type;
2411 	} else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {
2412 		lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
2413 	}
2414 	/* otherwise we don't modify the existing value */
2415 	idx++;
2416 	repeat_rate--;
2417 	if (il)
2418 		valid_tx_ant = il->hw_params.valid_tx_ant;
2419 
2420 	/* Fill rest of rate table */
2421 	while (idx < LINK_QUAL_MAX_RETRY_NUM) {
2422 		/* Repeat initial/next rate.
2423 		 * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
2424 		 * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
2425 		while (repeat_rate > 0 && idx < LINK_QUAL_MAX_RETRY_NUM) {
2426 			if (is_legacy(tbl_type.lq_type)) {
2427 				if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2428 					ant_toggle_cnt++;
2429 				else if (il &&
2430 					 il4965_rs_toggle_antenna(valid_tx_ant,
2431 								  &new_rate,
2432 								  &tbl_type))
2433 					ant_toggle_cnt = 1;
2434 			}
2435 
2436 			/* Override next rate if needed for debug purposes */
2437 			il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2438 
2439 			/* Fill next table entry */
2440 			lq_cmd->rs_table[idx].rate_n_flags =
2441 			    cpu_to_le32(new_rate);
2442 			repeat_rate--;
2443 			idx++;
2444 		}
2445 
2446 		il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2447 						&tbl_type, &rate_idx);
2448 
2449 		/* Indicate to uCode which entries might be MIMO.
2450 		 * If initial rate was MIMO, this will finally end up
2451 		 * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2452 		if (is_mimo(tbl_type.lq_type))
2453 			lq_cmd->general_params.mimo_delimiter = idx;
2454 
2455 		/* Get next rate */
2456 		new_rate =
2457 		    il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2458 					     use_ht_possible);
2459 
2460 		/* How many times should we repeat the next rate? */
2461 		if (is_legacy(tbl_type.lq_type)) {
2462 			if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2463 				ant_toggle_cnt++;
2464 			else if (il &&
2465 				 il4965_rs_toggle_antenna(valid_tx_ant,
2466 							  &new_rate, &tbl_type))
2467 				ant_toggle_cnt = 1;
2468 
2469 			repeat_rate = IL_NUMBER_TRY;
2470 		} else {
2471 			repeat_rate = IL_HT_NUMBER_TRY;
2472 		}
2473 
2474 		/* Don't allow HT rates after next pass.
2475 		 * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2476 		use_ht_possible = 0;
2477 
2478 		/* Override next rate if needed for debug purposes */
2479 		il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
2480 
2481 		/* Fill next table entry */
2482 		lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2483 
2484 		idx++;
2485 		repeat_rate--;
2486 	}
2487 
2488 	lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2489 	lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2490 
2491 	lq_cmd->agg_params.agg_time_limit =
2492 	    cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2493 }
2494 
2495 static void *
2496 il4965_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2497 {
2498 	return hw->priv;
2499 }
2500 
2501 /* rate scale requires free function to be implemented */
2502 static void
2503 il4965_rs_free(void *il_rate)
2504 {
2505 	return;
2506 }
2507 
2508 static void
2509 il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
2510 {
2511 	struct il_priv *il __maybe_unused = il_r;
2512 
2513 	D_RATE("enter\n");
2514 	D_RATE("leave\n");
2515 }
2516 
2517 #ifdef CONFIG_MAC80211_DEBUGFS
2518 
2519 static void
2520 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
2521 {
2522 	struct il_priv *il;
2523 	u8 valid_tx_ant;
2524 	u8 ant_sel_tx;
2525 
2526 	il = lq_sta->drv;
2527 	valid_tx_ant = il->hw_params.valid_tx_ant;
2528 	if (lq_sta->dbg_fixed_rate) {
2529 		ant_sel_tx =
2530 		    ((lq_sta->
2531 		      dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2532 		     RATE_MCS_ANT_POS);
2533 		if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2534 			*rate_n_flags = lq_sta->dbg_fixed_rate;
2535 			D_RATE("Fixed rate ON\n");
2536 		} else {
2537 			lq_sta->dbg_fixed_rate = 0;
2538 			IL_ERR
2539 			    ("Invalid antenna selection 0x%X, Valid is 0x%X\n",
2540 			     ant_sel_tx, valid_tx_ant);
2541 			D_RATE("Fixed rate OFF\n");
2542 		}
2543 	} else {
2544 		D_RATE("Fixed rate OFF\n");
2545 	}
2546 }
2547 
2548 static ssize_t
2549 il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2550 				      const char __user *user_buf,
2551 				      size_t count, loff_t *ppos)
2552 {
2553 	struct il_lq_sta *lq_sta = file->private_data;
2554 	struct il_priv *il;
2555 	char buf[64];
2556 	size_t buf_size;
2557 	u32 parsed_rate;
2558 
2559 	il = lq_sta->drv;
2560 	memset(buf, 0, sizeof(buf));
2561 	buf_size = min(count, sizeof(buf) - 1);
2562 	if (copy_from_user(buf, user_buf, buf_size))
2563 		return -EFAULT;
2564 
2565 	if (sscanf(buf, "%x", &parsed_rate) == 1)
2566 		lq_sta->dbg_fixed_rate = parsed_rate;
2567 	else
2568 		lq_sta->dbg_fixed_rate = 0;
2569 
2570 	lq_sta->active_legacy_rate = 0x0FFF;	/* 1 - 54 MBits, includes CCK */
2571 	lq_sta->active_siso_rate = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
2572 	lq_sta->active_mimo2_rate = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
2573 
2574 	D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
2575 	       lq_sta->dbg_fixed_rate);
2576 
2577 	if (lq_sta->dbg_fixed_rate) {
2578 		il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2579 		il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2580 	}
2581 
2582 	return count;
2583 }
2584 
2585 static ssize_t
2586 il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
2587 				     size_t count, loff_t *ppos)
2588 {
2589 	char *buff;
2590 	int desc = 0;
2591 	int i = 0;
2592 	int idx = 0;
2593 	ssize_t ret;
2594 
2595 	struct il_lq_sta *lq_sta = file->private_data;
2596 	struct il_priv *il;
2597 	struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2598 
2599 	il = lq_sta->drv;
2600 	buff = kmalloc(1024, GFP_KERNEL);
2601 	if (!buff)
2602 		return -ENOMEM;
2603 
2604 	desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);
2605 	desc +=
2606 	    sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",
2607 		    lq_sta->total_failed, lq_sta->total_success,
2608 		    lq_sta->active_legacy_rate);
2609 	desc +=
2610 	    sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
2611 	desc +=
2612 	    sprintf(buff + desc, "valid_tx_ant %s%s%s\n",
2613 		    (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2614 		    (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2615 		    (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2616 	desc +=
2617 	    sprintf(buff + desc, "lq type %s\n",
2618 		    (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2619 	if (is_Ht(tbl->lq_type)) {
2620 		desc +=
2621 		    sprintf(buff + desc, " %s",
2622 			    (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2623 		desc +=
2624 		    sprintf(buff + desc, " %s",
2625 			    (tbl->is_ht40) ? "40MHz" : "20MHz");
2626 		desc +=
2627 		    sprintf(buff + desc, " %s %s %s\n",
2628 			    (tbl->is_SGI) ? "SGI" : "",
2629 			    (lq_sta->is_green) ? "GF enabled" : "",
2630 			    (lq_sta->is_agg) ? "AGG on" : "");
2631 	}
2632 	desc +=
2633 	    sprintf(buff + desc, "last tx rate=0x%X\n",
2634 		    lq_sta->last_rate_n_flags);
2635 	desc +=
2636 	    sprintf(buff + desc,
2637 		    "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2638 		    lq_sta->lq.general_params.flags,
2639 		    lq_sta->lq.general_params.mimo_delimiter,
2640 		    lq_sta->lq.general_params.single_stream_ant_msk,
2641 		    lq_sta->lq.general_params.dual_stream_ant_msk);
2642 
2643 	desc +=
2644 	    sprintf(buff + desc,
2645 		    "agg:"
2646 		    "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2647 		    le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2648 		    lq_sta->lq.agg_params.agg_dis_start_th,
2649 		    lq_sta->lq.agg_params.agg_frame_cnt_limit);
2650 
2651 	desc +=
2652 	    sprintf(buff + desc,
2653 		    "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2654 		    lq_sta->lq.general_params.start_rate_idx[0],
2655 		    lq_sta->lq.general_params.start_rate_idx[1],
2656 		    lq_sta->lq.general_params.start_rate_idx[2],
2657 		    lq_sta->lq.general_params.start_rate_idx[3]);
2658 
2659 	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2660 		idx =
2661 		    il4965_hwrate_to_plcp_idx(le32_to_cpu
2662 					      (lq_sta->lq.rs_table[i].
2663 					       rate_n_flags));
2664 		if (is_legacy(tbl->lq_type)) {
2665 			desc +=
2666 			    sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,
2667 				    le32_to_cpu(lq_sta->lq.rs_table[i].
2668 						rate_n_flags),
2669 				    il_rate_mcs[idx].mbps);
2670 		} else {
2671 			desc +=
2672 			    sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",
2673 				    i,
2674 				    le32_to_cpu(lq_sta->lq.rs_table[i].
2675 						rate_n_flags),
2676 				    il_rate_mcs[idx].mbps,
2677 				    il_rate_mcs[idx].mcs);
2678 		}
2679 	}
2680 
2681 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2682 	kfree(buff);
2683 	return ret;
2684 }
2685 
2686 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2687 	.write = il4965_rs_sta_dbgfs_scale_table_write,
2688 	.read = il4965_rs_sta_dbgfs_scale_table_read,
2689 	.open = simple_open,
2690 	.llseek = default_llseek,
2691 };
2692 
2693 static ssize_t
2694 il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
2695 				     size_t count, loff_t *ppos)
2696 {
2697 	char *buff;
2698 	int desc = 0;
2699 	int i, j;
2700 	ssize_t ret;
2701 
2702 	struct il_lq_sta *lq_sta = file->private_data;
2703 
2704 	buff = kmalloc(1024, GFP_KERNEL);
2705 	if (!buff)
2706 		return -ENOMEM;
2707 
2708 	for (i = 0; i < LQ_SIZE; i++) {
2709 		desc +=
2710 		    sprintf(buff + desc,
2711 			    "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2712 			    "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
2713 			    lq_sta->lq_info[i].lq_type,
2714 			    lq_sta->lq_info[i].is_SGI,
2715 			    lq_sta->lq_info[i].is_ht40,
2716 			    lq_sta->lq_info[i].is_dup, lq_sta->is_green,
2717 			    lq_sta->lq_info[i].current_rate);
2718 		for (j = 0; j < RATE_COUNT; j++) {
2719 			desc +=
2720 			    sprintf(buff + desc,
2721 				    "counter=%d success=%d %%=%d\n",
2722 				    lq_sta->lq_info[i].win[j].counter,
2723 				    lq_sta->lq_info[i].win[j].success_counter,
2724 				    lq_sta->lq_info[i].win[j].success_ratio);
2725 		}
2726 	}
2727 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2728 	kfree(buff);
2729 	return ret;
2730 }
2731 
2732 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2733 	.read = il4965_rs_sta_dbgfs_stats_table_read,
2734 	.open = simple_open,
2735 	.llseek = default_llseek,
2736 };
2737 
2738 static ssize_t
2739 il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2740 					 char __user *user_buf, size_t count,
2741 					 loff_t *ppos)
2742 {
2743 	char buff[120];
2744 	int desc = 0;
2745 	struct il_lq_sta *lq_sta = file->private_data;
2746 	struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2747 
2748 	if (is_Ht(tbl->lq_type))
2749 		desc +=
2750 		    sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2751 			    tbl->expected_tpt[lq_sta->last_txrate_idx]);
2752 	else
2753 		desc +=
2754 		    sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
2755 			    il_rates[lq_sta->last_txrate_idx].ieee >> 1);
2756 
2757 	return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2758 }
2759 
2760 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2761 	.read = il4965_rs_sta_dbgfs_rate_scale_data_read,
2762 	.open = simple_open,
2763 	.llseek = default_llseek,
2764 };
2765 
2766 static void
2767 il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
2768 {
2769 	struct il_lq_sta *lq_sta = il_sta;
2770 	lq_sta->rs_sta_dbgfs_scale_table_file =
2771 	    debugfs_create_file("rate_scale_table", 0600, dir,
2772 				lq_sta, &rs_sta_dbgfs_scale_table_ops);
2773 	lq_sta->rs_sta_dbgfs_stats_table_file =
2774 	    debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
2775 				&rs_sta_dbgfs_stats_table_ops);
2776 	lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2777 	    debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
2778 				&rs_sta_dbgfs_rate_scale_data_ops);
2779 	lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2780 	    debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2781 			      &lq_sta->tx_agg_tid_en);
2782 
2783 }
2784 
2785 static void
2786 il4965_rs_remove_debugfs(void *il, void *il_sta)
2787 {
2788 	struct il_lq_sta *lq_sta = il_sta;
2789 	debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2790 	debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2791 	debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2792 	debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2793 }
2794 #endif
2795 
2796 /*
2797  * Initialization of rate scaling information is done by driver after
2798  * the station is added. Since mac80211 calls this function before a
2799  * station is added we ignore it.
2800  */
2801 static void
2802 il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
2803 			 struct cfg80211_chan_def *chandef,
2804 			 struct ieee80211_sta *sta, void *il_sta)
2805 {
2806 }
2807 
2808 static const struct rate_control_ops rs_4965_ops = {
2809 	.name = IL4965_RS_NAME,
2810 	.tx_status = il4965_rs_tx_status,
2811 	.get_rate = il4965_rs_get_rate,
2812 	.rate_init = il4965_rs_rate_init_stub,
2813 	.alloc = il4965_rs_alloc,
2814 	.free = il4965_rs_free,
2815 	.alloc_sta = il4965_rs_alloc_sta,
2816 	.free_sta = il4965_rs_free_sta,
2817 #ifdef CONFIG_MAC80211_DEBUGFS
2818 	.add_sta_debugfs = il4965_rs_add_debugfs,
2819 	.remove_sta_debugfs = il4965_rs_remove_debugfs,
2820 #endif
2821 };
2822 
2823 int
2824 il4965_rate_control_register(void)
2825 {
2826 	return ieee80211_rate_control_register(&rs_4965_ops);
2827 }
2828 
2829 void
2830 il4965_rate_control_unregister(void)
2831 {
2832 	ieee80211_rate_control_unregister(&rs_4965_ops);
2833 }
2834