1	// SPDX-License-Identifier: GPL-2.0-only
2	/******************************************************************************
3	*
4	* Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
5	*
6	* Contact Information:
7	* Intel Linux Wireless <ilw@linux.intel.com>
8	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
9	*
10	*****************************************************************************/
11	#include <linux/kernel.h>
12	#include <linux/skbuff.h>
13	#include <linux/slab.h>
14	#include <net/mac80211.h>
15
16	#include <linux/netdevice.h>
17	#include <linux/etherdevice.h>
18	#include <linux/delay.h>
19
20	#include <linux/workqueue.h>
21
22	#include "common.h"
23	#include "4965.h"
24
25	#define IL4965_RS_NAME "iwl-4965-rs"
26
27	#define NUM_TRY_BEFORE_ANT_TOGGLE 1
28	#define IL_NUMBER_TRY 1
29	#define IL_HT_NUMBER_TRY 3
30
31	#define RATE_MAX_WINDOW 62 /* # tx in history win */
32	#define RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
33	#define RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
34
35	/* max allowed rate miss before sync LQ cmd */
36	#define IL_MISSED_RATE_MAX 15
37	/* max time to accum history 2 seconds */
38	#define RATE_SCALE_FLUSH_INTVL (3*HZ)
39
40	static u8 rs_ht_to_legacy[] = {
41	RATE_6M_IDX, RATE_6M_IDX,
42	RATE_6M_IDX, RATE_6M_IDX,
43	RATE_6M_IDX,
44	RATE_6M_IDX, RATE_9M_IDX,
45	RATE_12M_IDX, RATE_18M_IDX,
46	RATE_24M_IDX, RATE_36M_IDX,
47	RATE_48M_IDX, RATE_54M_IDX
48	};
49
50	static const u8 ant_toggle_lookup[] = {
51	/*ANT_NONE -> */ ANT_NONE,
52	/*ANT_A -> */ ANT_B,
53	/*ANT_B -> */ ANT_C,
54	/*ANT_AB -> */ ANT_BC,
55	/*ANT_C -> */ ANT_A,
56	/*ANT_AC -> */ ANT_AB,
57	/*ANT_BC -> */ ANT_AC,
58	/*ANT_ABC -> */ ANT_ABC,
59	};
60
61	#define IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
62	[RATE_##r##M_IDX] = { RATE_##r##M_PLCP, \
63	RATE_SISO_##s##M_PLCP, \
64	RATE_MIMO2_##s##M_PLCP,\
65	RATE_##r##M_IEEE, \
66	RATE_##ip##M_IDX, \
67	RATE_##in##M_IDX, \
68	RATE_##rp##M_IDX, \
69	RATE_##rn##M_IDX, \
70	RATE_##pp##M_IDX, \
71	RATE_##np##M_IDX }
72
73	/*
74	* Parameter order:
75	* rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
76	*
77	* If there isn't a valid next or previous rate then INV is used which
78	* maps to RATE_INVALID
79	*
80	*/
81	const struct il_rate_info il_rates[RATE_COUNT] = {
82	IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
83	IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
84	IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
85	IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
86	IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
87	IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
88	IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
89	IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
90	IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
91	IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
92	IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
93	IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
94	IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
95	};
96
97	static int
98	il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
99	{
100	int idx = 0;
101
102	/* HT rate format */
103	if (rate_n_flags & RATE_MCS_HT_MSK) {
104	idx = (rate_n_flags & 0xff);
105
106	if (idx >= RATE_MIMO2_6M_PLCP)
107	idx = idx - RATE_MIMO2_6M_PLCP;
108
109	idx += IL_FIRST_OFDM_RATE;
110	/* skip 9M not supported in ht */
111	if (idx >= RATE_9M_IDX)
112	idx += 1;
113	if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
114	return idx;
115
116	/* legacy rate format, search for match in table */
117	} else {
118	for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
119	if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
120	return idx;
121	}
122
123	return -1;
124	}
125
126	static void il4965_rs_rate_scale_perform(struct il_priv *il,
127	struct sk_buff *skb,
128	struct ieee80211_sta *sta,
129	struct il_lq_sta *lq_sta);
130	static void il4965_rs_fill_link_cmd(struct il_priv *il,
131	struct il_lq_sta *lq_sta, u32 rate_n_flags);
132	static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
133	bool force_search);
134
135	#ifdef CONFIG_MAC80211_DEBUGFS
136	static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
137	u32 *rate_n_flags, int idx);
138	#else
139	static void
140	il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
141	{
142	}
143	#endif
144
145	/*
146	* The following tables contain the expected throughput metrics for all rates
147	*
148	* 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
149	*
150	* where invalid entries are zeros.
151	*
152	* CCK rates are only valid in legacy table and will only be used in G
153	* (2.4 GHz) band.
154	*/
155
156	static s32 expected_tpt_legacy[RATE_COUNT] = {
157	7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
158	};
159
160	static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
161	{0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
162	{0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
163	{0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
164	{0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
165	};
166
167	static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {
168	{0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
169	{0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
170	{0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
171	{0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
172	};
173
174	static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
175	{0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
176	{0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
177	{0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
178	{0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI */
179	};
180
181	static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {
182	{0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
183	{0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
184	{0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
185	{0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
186	};
187
188	/* mbps, mcs */
189	static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {
190	{"1", "BPSK DSSS"},
191	{"2", "QPSK DSSS"},
192	{"5.5", "BPSK CCK"},
193	{"11", "QPSK CCK"},
194	{"6", "BPSK 1/2"},
195	{"9", "BPSK 1/2"},
196	{"12", "QPSK 1/2"},
197	{"18", "QPSK 3/4"},
198	{"24", "16QAM 1/2"},
199	{"36", "16QAM 3/4"},
200	{"48", "64QAM 2/3"},
201	{"54", "64QAM 3/4"},
202	{"60", "64QAM 5/6"},
203	};
204
205	#define MCS_IDX_PER_STREAM (8)
206
207	static inline u8
208	il4965_rs_extract_rate(u32 rate_n_flags)
209	{
210	return (u8) (rate_n_flags & 0xFF);
211	}
212
213	static void
214	il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
215	{
216	win->data = 0;
217	win->success_counter = 0;
218	win->success_ratio = IL_INVALID_VALUE;
219	win->counter = 0;
220	win->average_tpt = IL_INVALID_VALUE;
221	win->stamp = 0;
222	}
223
224	static inline u8
225	il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
226	{
227	return (ant_type & valid_antenna) == ant_type;
228	}
229
230	/*
231	* removes the old data from the stats. All data that is older than
232	* TID_MAX_TIME_DIFF, will be deleted.
233	*/
234	static void
235	il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)
236	{
237	/* The oldest age we want to keep */
238	u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
239
240	while (tl->queue_count && tl->time_stamp < oldest_time) {
241	tl->total -= tl->packet_count[tl->head];
242	tl->packet_count[tl->head] = 0;
243	tl->time_stamp += TID_QUEUE_CELL_SPACING;
244	tl->queue_count--;
245	tl->head++;
246	if (tl->head >= TID_QUEUE_MAX_SIZE)
247	tl->head = 0;
248	}
249	}
250
251	/*
252	* increment traffic load value for tid and also remove
253	* any old values if passed the certain time period
254	*/
255	static u8
256	il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
257	{
258	u32 curr_time = jiffies_to_msecs(j: jiffies);
259	u32 time_diff;
260	s32 idx;
261	struct il_traffic_load *tl = NULL;
262	u8 tid;
263
264	if (ieee80211_is_data_qos(fc: hdr->frame_control)) {
265	u8 *qc = ieee80211_get_qos_ctl(hdr);
266	tid = qc[0] & 0xf;
267	} else
268	return MAX_TID_COUNT;
269
270	if (unlikely(tid >= TID_MAX_LOAD_COUNT))
271	return MAX_TID_COUNT;
272
273	tl = &lq_data->load[tid];
274
275	curr_time -= curr_time % TID_ROUND_VALUE;
276
277	/* Happens only for the first packet. Initialize the data */
278	if (!(tl->queue_count)) {
279	tl->total = 1;
280	tl->time_stamp = curr_time;
281	tl->queue_count = 1;
282	tl->head = 0;
283	tl->packet_count[0] = 1;
284	return MAX_TID_COUNT;
285	}
286
287	time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
288	idx = time_diff / TID_QUEUE_CELL_SPACING;
289
290	/* The history is too long: remove data that is older than */
291	/* TID_MAX_TIME_DIFF */
292	if (idx >= TID_QUEUE_MAX_SIZE)
293	il4965_rs_tl_rm_old_stats(tl, curr_time);
294
295	idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
296	tl->packet_count[idx] = tl->packet_count[idx] + 1;
297	tl->total = tl->total + 1;
298
299	if ((idx + 1) > tl->queue_count)
300	tl->queue_count = idx + 1;
301
302	return tid;
303	}
304
305	/*
306	get the traffic load value for tid
307	*/
308	static u32
309	il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
310	{
311	u32 curr_time = jiffies_to_msecs(j: jiffies);
312	u32 time_diff;
313	s32 idx;
314	struct il_traffic_load *tl = NULL;
315
316	if (tid >= TID_MAX_LOAD_COUNT)
317	return 0;
318
319	tl = &(lq_data->load[tid]);
320
321	curr_time -= curr_time % TID_ROUND_VALUE;
322
323	if (!(tl->queue_count))
324	return 0;
325
326	time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
327	idx = time_diff / TID_QUEUE_CELL_SPACING;
328
329	/* The history is too long: remove data that is older than */
330	/* TID_MAX_TIME_DIFF */
331	if (idx >= TID_QUEUE_MAX_SIZE)
332	il4965_rs_tl_rm_old_stats(tl, curr_time);
333
334	return tl->total;
335	}
336
337	static int
338	il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
339	u8 tid, struct ieee80211_sta *sta)
340	{
341	int ret = -EAGAIN;
342	u32 load;
343
344	load = il4965_rs_tl_get_load(lq_data, tid);
345
346	if (load > IL_AGG_LOAD_THRESHOLD) {
347	D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);
348	ret = ieee80211_start_tx_ba_session(sta, tid, timeout: 5000);
349	if (ret == -EAGAIN) {
350	/*
351	* driver and mac80211 is out of sync
352	* this might be cause by reloading firmware
353	* stop the tx ba session here
354	*/
355	IL_ERR("Fail start Tx agg on tid: %d\n", tid);
356	ieee80211_stop_tx_ba_session(sta, tid);
357	}
358	} else
359	D_HT("Aggregation not enabled for tid %d because load = %u\n",
360	tid, load);
361
362	return ret;
363	}
364
365	static void
366	il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
367	struct ieee80211_sta *sta)
368	{
369	if (tid < TID_MAX_LOAD_COUNT)
370	il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
371	else
372	IL_ERR("tid exceeds max load count: %d/%d\n", tid,
373	TID_MAX_LOAD_COUNT);
374	}
375
376	static inline int
377	il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)
378	{
379	return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
380	!!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
381	!!(rate_n_flags & RATE_MCS_ANT_C_MSK);
382	}
383
384	/*
385	* Static function to get the expected throughput from an il_scale_tbl_info
386	* that wraps a NULL pointer check
387	*/
388	static s32
389	il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
390	{
391	if (tbl->expected_tpt)
392	return tbl->expected_tpt[rs_idx];
393	return 0;
394	}
395
396	/*
397	* il4965_rs_collect_tx_data - Update the success/failure sliding win
398	*
399	* We keep a sliding win of the last 62 packets transmitted
400	* at this rate. win->data contains the bitmask of successful
401	* packets.
402	*/
403	static int
404	il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
405	int attempts, int successes)
406	{
407	struct il_rate_scale_data *win = NULL;
408	static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
409	s32 fail_count, tpt;
410
411	if (scale_idx < 0 || scale_idx >= RATE_COUNT)
412	return -EINVAL;
413
414	/* Select win for current tx bit rate */
415	win = &(tbl->win[scale_idx]);
416
417	/* Get expected throughput */
418	tpt = il4965_get_expected_tpt(tbl, rs_idx: scale_idx);
419
420	/*
421	* Keep track of only the latest 62 tx frame attempts in this rate's
422	* history win; anything older isn't really relevant any more.
423	* If we have filled up the sliding win, drop the oldest attempt;
424	* if the oldest attempt (highest bit in bitmap) shows "success",
425	* subtract "1" from the success counter (this is the main reason
426	* we keep these bitmaps!).
427	*/
428	while (attempts > 0) {
429	if (win->counter >= RATE_MAX_WINDOW) {
430
431	/* remove earliest */
432	win->counter = RATE_MAX_WINDOW - 1;
433
434	if (win->data & mask) {
435	win->data &= ~mask;
436	win->success_counter--;
437	}
438	}
439
440	/* Increment frames-attempted counter */
441	win->counter++;
442
443	/* Shift bitmap by one frame to throw away oldest history */
444	win->data <<= 1;
445
446	/* Mark the most recent #successes attempts as successful */
447	if (successes > 0) {
448	win->success_counter++;
449	win->data |= 0x1;
450	successes--;
451	}
452
453	attempts--;
454	}
455
456	/* Calculate current success ratio, avoid divide-by-0! */
457	if (win->counter > 0)
458	win->success_ratio =
459	128 * (100 * win->success_counter) / win->counter;
460	else
461	win->success_ratio = IL_INVALID_VALUE;
462
463	fail_count = win->counter - win->success_counter;
464
465	/* Calculate average throughput, if we have enough history. */
466	if (fail_count >= RATE_MIN_FAILURE_TH ||
467	win->success_counter >= RATE_MIN_SUCCESS_TH)
468	win->average_tpt = (win->success_ratio * tpt + 64) / 128;
469	else
470	win->average_tpt = IL_INVALID_VALUE;
471
472	/* Tag this win as having been updated */
473	win->stamp = jiffies;
474
475	return 0;
476	}
477
478	/*
479	* Fill uCode API rate_n_flags field, based on "search" or "active" table.
480	*/
481	static u32
482	il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
483	int idx, u8 use_green)
484	{
485	u32 rate_n_flags = 0;
486
487	if (is_legacy(tbl->lq_type)) {
488	rate_n_flags = il_rates[idx].plcp;
489	if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
490	rate_n_flags |= RATE_MCS_CCK_MSK;
491
492	} else if (is_Ht(tbl->lq_type)) {
493	if (idx > IL_LAST_OFDM_RATE) {
494	IL_ERR("Invalid HT rate idx %d\n", idx);
495	idx = IL_LAST_OFDM_RATE;
496	}
497	rate_n_flags = RATE_MCS_HT_MSK;
498
499	if (is_siso(tbl->lq_type))
500	rate_n_flags |= il_rates[idx].plcp_siso;
501	else
502	rate_n_flags |= il_rates[idx].plcp_mimo2;
503	} else {
504	IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);
505	}
506
507	rate_n_flags |=
508	((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);
509
510	if (is_Ht(tbl->lq_type)) {
511	if (tbl->is_ht40) {
512	if (tbl->is_dup)
513	rate_n_flags |= RATE_MCS_DUP_MSK;
514	else
515	rate_n_flags |= RATE_MCS_HT40_MSK;
516	}
517	if (tbl->is_SGI)
518	rate_n_flags |= RATE_MCS_SGI_MSK;
519
520	if (use_green) {
521	rate_n_flags |= RATE_MCS_GF_MSK;
522	if (is_siso(tbl->lq_type) && tbl->is_SGI) {
523	rate_n_flags &= ~RATE_MCS_SGI_MSK;
524	IL_ERR("GF was set with SGI:SISO\n");
525	}
526	}
527	}
528	return rate_n_flags;
529	}
530
531	/*
532	* Interpret uCode API's rate_n_flags format,
533	* fill "search" or "active" tx mode table.
534	*/
535	static int
536	il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
537	enum nl80211_band band,
538	struct il_scale_tbl_info *tbl, int *rate_idx)
539	{
540	u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
541	u8 il4965_num_of_ant =
542	il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
543	u8 mcs;
544
545	memset(tbl, 0, sizeof(struct il_scale_tbl_info));
546	*rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
547
548	if (*rate_idx == RATE_INVALID) {
549	*rate_idx = -1;
550	return -EINVAL;
551	}
552	tbl->is_SGI = 0; /* default legacy setup */
553	tbl->is_ht40 = 0;
554	tbl->is_dup = 0;
555	tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
556	tbl->lq_type = LQ_NONE;
557	tbl->max_search = IL_MAX_SEARCH;
558
559	/* legacy rate format */
560	if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
561	if (il4965_num_of_ant == 1) {
562	if (band == NL80211_BAND_5GHZ)
563	tbl->lq_type = LQ_A;
564	else
565	tbl->lq_type = LQ_G;
566	}
567	/* HT rate format */
568	} else {
569	if (rate_n_flags & RATE_MCS_SGI_MSK)
570	tbl->is_SGI = 1;
571
572	if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
573	(rate_n_flags & RATE_MCS_DUP_MSK))
574	tbl->is_ht40 = 1;
575
576	if (rate_n_flags & RATE_MCS_DUP_MSK)
577	tbl->is_dup = 1;
578
579	mcs = il4965_rs_extract_rate(rate_n_flags);
580
581	/* SISO */
582	if (mcs <= RATE_SISO_60M_PLCP) {
583	if (il4965_num_of_ant == 1)
584	tbl->lq_type = LQ_SISO; /*else NONE */
585	/* MIMO2 */
586	} else {
587	if (il4965_num_of_ant == 2)
588	tbl->lq_type = LQ_MIMO2;
589	}
590	}
591	return 0;
592	}
593
594	/* switch to another antenna/antennas and return 1 */
595	/* if no other valid antenna found, return 0 */
596	static int
597	il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
598	struct il_scale_tbl_info *tbl)
599	{
600	u8 new_ant_type;
601
602	if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
603	return 0;
604
605	if (!il4965_rs_is_valid_ant(valid_antenna: valid_ant, ant_type: tbl->ant_type))
606	return 0;
607
608	new_ant_type = ant_toggle_lookup[tbl->ant_type];
609
610	while (new_ant_type != tbl->ant_type &&
611	!il4965_rs_is_valid_ant(valid_antenna: valid_ant, ant_type: new_ant_type))
612	new_ant_type = ant_toggle_lookup[new_ant_type];
613
614	if (new_ant_type == tbl->ant_type)
615	return 0;
616
617	tbl->ant_type = new_ant_type;
618	*rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
619	*rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
620	return 1;
621	}
622
623	/*
624	* Green-field mode is valid if the station supports it and
625	* there are no non-GF stations present in the BSS.
626	*/
627	static bool
628	il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
629	{
630	return (sta->deflink.ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
631	!il->ht.non_gf_sta_present;
632	}
633
634	/*
635	* il4965_rs_get_supported_rates - get the available rates
636	*
637	* if management frame or broadcast frame only return
638	* basic available rates.
639	*
640	*/
641	static u16
642	il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
643	struct ieee80211_hdr *hdr,
644	enum il_table_type rate_type)
645	{
646	if (is_legacy(rate_type)) {
647	return lq_sta->active_legacy_rate;
648	} else {
649	if (is_siso(rate_type))
650	return lq_sta->active_siso_rate;
651	else
652	return lq_sta->active_mimo2_rate;
653	}
654	}
655
656	static u16
657	il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
658	int rate_type)
659	{
660	u8 high = RATE_INVALID;
661	u8 low = RATE_INVALID;
662
663	/* 802.11A or ht walks to the next literal adjacent rate in
664	* the rate table */
665	if (is_a_band(rate_type) || !is_legacy(rate_type)) {
666	int i;
667	u32 mask;
668
669	/* Find the previous rate that is in the rate mask */
670	i = idx - 1;
671	for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
672	if (rate_mask & mask) {
673	low = i;
674	break;
675	}
676	}
677
678	/* Find the next rate that is in the rate mask */
679	i = idx + 1;
680	for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
681	if (rate_mask & mask) {
682	high = i;
683	break;
684	}
685	}
686
687	return (high << 8) | low;
688	}
689
690	low = idx;
691	while (low != RATE_INVALID) {
692	low = il_rates[low].prev_rs;
693	if (low == RATE_INVALID)
694	break;
695	if (rate_mask & (1 << low))
696	break;
697	D_RATE("Skipping masked lower rate: %d\n", low);
698	}
699
700	high = idx;
701	while (high != RATE_INVALID) {
702	high = il_rates[high].next_rs;
703	if (high == RATE_INVALID)
704	break;
705	if (rate_mask & (1 << high))
706	break;
707	D_RATE("Skipping masked higher rate: %d\n", high);
708	}
709
710	return (high << 8) | low;
711	}
712
713	static u32
714	il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
715	struct il_scale_tbl_info *tbl, u8 scale_idx,
716	u8 ht_possible)
717	{
718	s32 low;
719	u16 rate_mask;
720	u16 high_low;
721	u8 switch_to_legacy = 0;
722	u8 is_green = lq_sta->is_green;
723	struct il_priv *il = lq_sta->drv;
724
725	/* check if we need to switch from HT to legacy rates.
726	* assumption is that mandatory rates (1Mbps or 6Mbps)
727	* are always supported (spec demand) */
728	if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_idx)) {
729	switch_to_legacy = 1;
730	scale_idx = rs_ht_to_legacy[scale_idx];
731	if (lq_sta->band == NL80211_BAND_5GHZ)
732	tbl->lq_type = LQ_A;
733	else
734	tbl->lq_type = LQ_G;
735
736	if (il4965_num_of_ant(m: tbl->ant_type) > 1)
737	tbl->ant_type =
738	il4965_first_antenna(mask: il->hw_params.valid_tx_ant);
739
740	tbl->is_ht40 = 0;
741	tbl->is_SGI = 0;
742	tbl->max_search = IL_MAX_SEARCH;
743	}
744
745	rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, rate_type: tbl->lq_type);
746
747	/* Mask with station rate restriction */
748	if (is_legacy(tbl->lq_type)) {
749	/* supp_rates has no CCK bits in A mode */
750	if (lq_sta->band == NL80211_BAND_5GHZ)
751	rate_mask =
752	(u16) (rate_mask &
753	(lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
754	else
755	rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
756	}
757
758	/* If we switched from HT to legacy, check current rate */
759	if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
760	low = scale_idx;
761	goto out;
762	}
763
764	high_low =
765	il4965_rs_get_adjacent_rate(il: lq_sta->drv, idx: scale_idx, rate_mask,
766	rate_type: tbl->lq_type);
767	low = high_low & 0xff;
768
769	if (low == RATE_INVALID)
770	low = scale_idx;
771
772	out:
773	return il4965_rate_n_flags_from_tbl(il: lq_sta->drv, tbl, idx: low, use_green: is_green);
774	}
775
776	/*
777	* Simple function to compare two rate scale table types
778	*/
779	static bool
780	il4965_table_type_matches(struct il_scale_tbl_info *a,
781	struct il_scale_tbl_info *b)
782	{
783	return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
784	a->is_SGI == b->is_SGI);
785	}
786
787	/*
788	* mac80211 sends us Tx status
789	*/
790	static void
791	il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
792	struct ieee80211_sta *sta, void *il_sta,
793	struct sk_buff *skb)
794	{
795	int legacy_success;
796	int retries;
797	int rs_idx, mac_idx, i;
798	struct il_lq_sta *lq_sta = il_sta;
799	struct il_link_quality_cmd *table;
800	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
801	struct il_priv *il = (struct il_priv *)il_r;
802	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
803	enum mac80211_rate_control_flags mac_flags;
804	u32 tx_rate;
805	struct il_scale_tbl_info tbl_type;
806	struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
807
808	D_RATE("get frame ack response, update rate scale win\n");
809
810	/* Treat uninitialized rate scaling data same as non-existing. */
811	if (!lq_sta) {
812	D_RATE("Station rate scaling not created yet.\n");
813	return;
814	} else if (!lq_sta->drv) {
815	D_RATE("Rate scaling not initialized yet.\n");
816	return;
817	}
818
819	if (!ieee80211_is_data(fc: hdr->frame_control) ||
820	(info->flags & IEEE80211_TX_CTL_NO_ACK))
821	return;
822
823	/* This packet was aggregated but doesn't carry status info */
824	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
825	!(info->flags & IEEE80211_TX_STAT_AMPDU))
826	return;
827
828	/*
829	* Ignore this Tx frame response if its initial rate doesn't match
830	* that of latest Link Quality command. There may be stragglers
831	* from a previous Link Quality command, but we're no longer interested
832	* in those; they're either from the "active" mode while we're trying
833	* to check "search" mode, or a prior "search" mode after we've moved
834	* to a new "search" mode (which might become the new "active" mode).
835	*/
836	table = &lq_sta->lq;
837	tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
838	il4965_rs_get_tbl_info_from_mcs(rate_n_flags: tx_rate, band: il->band, tbl: &tbl_type, rate_idx: &rs_idx);
839	if (il->band == NL80211_BAND_5GHZ)
840	rs_idx -= IL_FIRST_OFDM_RATE;
841	mac_flags = info->status.rates[0].flags;
842	mac_idx = info->status.rates[0].idx;
843	/* For HT packets, map MCS to PLCP */
844	if (mac_flags & IEEE80211_TX_RC_MCS) {
845	mac_idx &= RATE_MCS_CODE_MSK; /* Remove # of streams */
846	if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
847	mac_idx++;
848	/*
849	* mac80211 HT idx is always zero-idxed; we need to move
850	* HT OFDM rates after CCK rates in 2.4 GHz band
851	*/
852	if (il->band == NL80211_BAND_2GHZ)
853	mac_idx += IL_FIRST_OFDM_RATE;
854	}
855	/* Here we actually compare this rate to the latest LQ command */
856	if (mac_idx < 0 ||
857	tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
858	tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
859	tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
860	tbl_type.ant_type != info->status.antenna ||
861	!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
862	|| !!(tx_rate & RATE_MCS_GF_MSK) !=
863	!!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
864	D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
865	rs_idx, tx_rate);
866	/*
867	* Since rates mis-match, the last LQ command may have failed.
868	* After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
869	* ... driver.
870	*/
871	lq_sta->missed_rate_counter++;
872	if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
873	lq_sta->missed_rate_counter = 0;
874	il_send_lq_cmd(il, lq: &lq_sta->lq, flags: CMD_ASYNC, init: false);
875	}
876	/* Regardless, ignore this status info for outdated rate */
877	return;
878	} else
879	/* Rate did match, so reset the missed_rate_counter */
880	lq_sta->missed_rate_counter = 0;
881
882	/* Figure out if rate scale algorithm is in active or search table */
883	if (il4965_table_type_matches
884	(a: &tbl_type, b: &(lq_sta->lq_info[lq_sta->active_tbl]))) {
885	curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
886	other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
887	} else
888	if (il4965_table_type_matches
889	(a: &tbl_type, b: &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
890	curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
891	other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
892	} else {
893	D_RATE("Neither active nor search matches tx rate\n");
894	tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
895	D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
896	tmp_tbl->ant_type, tmp_tbl->is_SGI);
897	tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
898	D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
899	tmp_tbl->ant_type, tmp_tbl->is_SGI);
900	D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
901	tbl_type.ant_type, tbl_type.is_SGI);
902	/*
903	* no matching table found, let's by-pass the data collection
904	* and continue to perform rate scale to find the rate table
905	*/
906	il4965_rs_stay_in_table(lq_sta, force_search: true);
907	goto done;
908	}
909
910	/*
911	* Updating the frame history depends on whether packets were
912	* aggregated.
913	*
914	* For aggregation, all packets were transmitted at the same rate, the
915	* first idx into rate scale table.
916	*/
917	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
918	tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
919	il4965_rs_get_tbl_info_from_mcs(rate_n_flags: tx_rate, band: il->band, tbl: &tbl_type,
920	rate_idx: &rs_idx);
921	il4965_rs_collect_tx_data(tbl: curr_tbl, scale_idx: rs_idx,
922	attempts: info->status.ampdu_len,
923	successes: info->status.ampdu_ack_len);
924
925	/* Update success/fail counts if not searching for new mode */
926	if (lq_sta->stay_in_tbl) {
927	lq_sta->total_success += info->status.ampdu_ack_len;
928	lq_sta->total_failed +=
929	(info->status.ampdu_len -
930	info->status.ampdu_ack_len);
931	}
932	} else {
933	/*
934	* For legacy, update frame history with for each Tx retry.
935	*/
936	retries = info->status.rates[0].count - 1;
937	/* HW doesn't send more than 15 retries */
938	retries = min(retries, 15);
939
940	/* The last transmission may have been successful */
941	legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
942	/* Collect data for each rate used during failed TX attempts */
943	for (i = 0; i <= retries; ++i) {
944	tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
945	il4965_rs_get_tbl_info_from_mcs(rate_n_flags: tx_rate, band: il->band,
946	tbl: &tbl_type, rate_idx: &rs_idx);
947	/*
948	* Only collect stats if retried rate is in the same RS
949	* table as active/search.
950	*/
951	if (il4965_table_type_matches(a: &tbl_type, b: curr_tbl))
952	tmp_tbl = curr_tbl;
953	else if (il4965_table_type_matches
954	(a: &tbl_type, b: other_tbl))
955	tmp_tbl = other_tbl;
956	else
957	continue;
958	il4965_rs_collect_tx_data(tbl: tmp_tbl, scale_idx: rs_idx, attempts: 1,
959	successes: i <
960	retries ? 0 : legacy_success);
961	}
962
963	/* Update success/fail counts if not searching for new mode */
964	if (lq_sta->stay_in_tbl) {
965	lq_sta->total_success += legacy_success;
966	lq_sta->total_failed += retries + (1 - legacy_success);
967	}
968	}
969	/* The last TX rate is cached in lq_sta; it's set in if/else above */
970	lq_sta->last_rate_n_flags = tx_rate;
971	done:
972	/* See if there's a better rate or modulation mode to try. */
973	if (sta->deflink.supp_rates[sband->band])
974	il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
975	}
976
977	/*
978	* Begin a period of staying with a selected modulation mode.
979	* Set "stay_in_tbl" flag to prevent any mode switches.
980	* Set frame tx success limits according to legacy vs. high-throughput,
981	* and reset overall (spanning all rates) tx success history stats.
982	* These control how long we stay using same modulation mode before
983	* searching for a new mode.
984	*/
985	static void
986	il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
987	struct il_lq_sta *lq_sta)
988	{
989	D_RATE("we are staying in the same table\n");
990	lq_sta->stay_in_tbl = 1; /* only place this gets set */
991	if (is_legacy) {
992	lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
993	lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
994	lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
995	} else {
996	lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
997	lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
998	lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
999	}
1000	lq_sta->table_count = 0;
1001	lq_sta->total_failed = 0;
1002	lq_sta->total_success = 0;
1003	lq_sta->flush_timer = jiffies;
1004	lq_sta->action_counter = 0;
1005	}
1006
1007	/*
1008	* Find correct throughput table for given mode of modulation
1009	*/
1010	static void
1011	il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
1012	struct il_scale_tbl_info *tbl)
1013	{
1014	/* Used to choose among HT tables */
1015	s32(*ht_tbl_pointer)[RATE_COUNT];
1016
1017	/* Check for invalid LQ type */
1018	if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1019	tbl->expected_tpt = expected_tpt_legacy;
1020	return;
1021	}
1022
1023	/* Legacy rates have only one table */
1024	if (is_legacy(tbl->lq_type)) {
1025	tbl->expected_tpt = expected_tpt_legacy;
1026	return;
1027	}
1028
1029	/* Choose among many HT tables depending on number of streams
1030	* (SISO/MIMO2), channel width (20/40), SGI, and aggregation
1031	* status */
1032	if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1033	ht_tbl_pointer = expected_tpt_siso20MHz;
1034	else if (is_siso(tbl->lq_type))
1035	ht_tbl_pointer = expected_tpt_siso40MHz;
1036	else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1037	ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1038	else /* if (is_mimo2(tbl->lq_type)) <-- must be true */
1039	ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1040
1041	if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1042	tbl->expected_tpt = ht_tbl_pointer[0];
1043	else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1044	tbl->expected_tpt = ht_tbl_pointer[1];
1045	else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1046	tbl->expected_tpt = ht_tbl_pointer[2];
1047	else /* AGG+SGI */
1048	tbl->expected_tpt = ht_tbl_pointer[3];
1049	}
1050
1051	/*
1052	* Find starting rate for new "search" high-throughput mode of modulation.
1053	* Goal is to find lowest expected rate (under perfect conditions) that is
1054	* above the current measured throughput of "active" mode, to give new mode
1055	* a fair chance to prove itself without too many challenges.
1056	*
1057	* This gets called when transitioning to more aggressive modulation
1058	* (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1059	* (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1060	* to decrease to match "active" throughput. When moving from MIMO to SISO,
1061	* bit rate will typically need to increase, but not if performance was bad.
1062	*/
1063	static s32
1064	il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
1065	struct il_scale_tbl_info *tbl, /* "search" */
1066	u16 rate_mask, s8 idx)
1067	{
1068	/* "active" values */
1069	struct il_scale_tbl_info *active_tbl =
1070	&(lq_sta->lq_info[lq_sta->active_tbl]);
1071	s32 active_sr = active_tbl->win[idx].success_ratio;
1072	s32 active_tpt = active_tbl->expected_tpt[idx];
1073
1074	/* expected "search" throughput */
1075	s32 *tpt_tbl = tbl->expected_tpt;
1076
1077	s32 new_rate, high, low, start_hi;
1078	u16 high_low;
1079	s8 rate = idx;
1080
1081	new_rate = high = low = start_hi = RATE_INVALID;
1082
1083	for (;;) {
1084	high_low =
1085	il4965_rs_get_adjacent_rate(il, idx: rate, rate_mask,
1086	rate_type: tbl->lq_type);
1087
1088	low = high_low & 0xff;
1089	high = (high_low >> 8) & 0xff;
1090
1091	/*
1092	* Lower the "search" bit rate, to give new "search" mode
1093	* approximately the same throughput as "active" if:
1094	*
1095	* 1) "Active" mode has been working modestly well (but not
1096	* great), and expected "search" throughput (under perfect
1097	* conditions) at candidate rate is above the actual
1098	* measured "active" throughput (but less than expected
1099	* "active" throughput under perfect conditions).
1100	* OR
1101	* 2) "Active" mode has been working perfectly or very well
1102	* and expected "search" throughput (under perfect
1103	* conditions) at candidate rate is above expected
1104	* "active" throughput (under perfect conditions).
1105	*/
1106	if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
1107	(active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
1108	&& tpt_tbl[rate] <= active_tpt)) ||
1109	(active_sr >= RATE_SCALE_SWITCH &&
1110	tpt_tbl[rate] > active_tpt)) {
1111
1112	/* (2nd or later pass)
1113	* If we've already tried to raise the rate, and are
1114	* now trying to lower it, use the higher rate. */
1115	if (start_hi != RATE_INVALID) {
1116	new_rate = start_hi;
1117	break;
1118	}
1119
1120	new_rate = rate;
1121
1122	/* Loop again with lower rate */
1123	if (low != RATE_INVALID)
1124	rate = low;
1125
1126	/* Lower rate not available, use the original */
1127	else
1128	break;
1129
1130	/* Else try to raise the "search" rate to match "active" */
1131	} else {
1132	/* (2nd or later pass)
1133	* If we've already tried to lower the rate, and are
1134	* now trying to raise it, use the lower rate. */
1135	if (new_rate != RATE_INVALID)
1136	break;
1137
1138	/* Loop again with higher rate */
1139	else if (high != RATE_INVALID) {
1140	start_hi = high;
1141	rate = high;
1142
1143	/* Higher rate not available, use the original */
1144	} else {
1145	new_rate = rate;
1146	break;
1147	}
1148	}
1149	}
1150
1151	return new_rate;
1152	}
1153
1154	/*
1155	* Set up search table for MIMO2
1156	*/
1157	static int
1158	il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
1159	struct ieee80211_conf *conf,
1160	struct ieee80211_sta *sta,
1161	struct il_scale_tbl_info *tbl, int idx)
1162	{
1163	u16 rate_mask;
1164	s32 rate;
1165	s8 is_green = lq_sta->is_green;
1166
1167	if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1168	return -1;
1169
1170	if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC)
1171	return -1;
1172
1173	/* Need both Tx chains/antennas to support MIMO */
1174	if (il->hw_params.tx_chains_num < 2)
1175	return -1;
1176
1177	D_RATE("LQ: try to switch to MIMO2\n");
1178
1179	tbl->lq_type = LQ_MIMO2;
1180	tbl->is_dup = lq_sta->is_dup;
1181	tbl->action = 0;
1182	tbl->max_search = IL_MAX_SEARCH;
1183	rate_mask = lq_sta->active_mimo2_rate;
1184
1185	if (il_is_ht40_tx_allowed(il, ht_cap: &sta->deflink.ht_cap))
1186	tbl->is_ht40 = 1;
1187	else
1188	tbl->is_ht40 = 0;
1189
1190	il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1191
1192	rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1193
1194	D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1195	if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1196	D_RATE("Can't switch with idx %d rate mask %x\n", rate,
1197	rate_mask);
1198	return -1;
1199	}
1200	tbl->current_rate =
1201	il4965_rate_n_flags_from_tbl(il, tbl, idx: rate, use_green: is_green);
1202
1203	D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1204	is_green);
1205	return 0;
1206	}
1207
1208	/*
1209	* Set up search table for SISO
1210	*/
1211	static int
1212	il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
1213	struct ieee80211_conf *conf, struct ieee80211_sta *sta,
1214	struct il_scale_tbl_info *tbl, int idx)
1215	{
1216	u16 rate_mask;
1217	u8 is_green = lq_sta->is_green;
1218	s32 rate;
1219
1220	if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
1221	return -1;
1222
1223	D_RATE("LQ: try to switch to SISO\n");
1224
1225	tbl->is_dup = lq_sta->is_dup;
1226	tbl->lq_type = LQ_SISO;
1227	tbl->action = 0;
1228	tbl->max_search = IL_MAX_SEARCH;
1229	rate_mask = lq_sta->active_siso_rate;
1230
1231	if (il_is_ht40_tx_allowed(il, ht_cap: &sta->deflink.ht_cap))
1232	tbl->is_ht40 = 1;
1233	else
1234	tbl->is_ht40 = 0;
1235
1236	if (is_green)
1237	tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield */
1238
1239	il4965_rs_set_expected_tpt_table(lq_sta, tbl);
1240	rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
1241
1242	D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1243	if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
1244	D_RATE("can not switch with idx %d rate mask %x\n", rate,
1245	rate_mask);
1246	return -1;
1247	}
1248	tbl->current_rate =
1249	il4965_rate_n_flags_from_tbl(il, tbl, idx: rate, use_green: is_green);
1250	D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
1251	is_green);
1252	return 0;
1253	}
1254
1255	/*
1256	* Try to switch to new modulation mode from legacy
1257	*/
1258	static int
1259	il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1260	struct ieee80211_conf *conf,
1261	struct ieee80211_sta *sta, int idx)
1262	{
1263	struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1264	struct il_scale_tbl_info *search_tbl =
1265	&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1266	struct il_rate_scale_data *win = &(tbl->win[idx]);
1267	u32 sz =
1268	(sizeof(struct il_scale_tbl_info) -
1269	(sizeof(struct il_rate_scale_data) * RATE_COUNT));
1270	u8 start_action;
1271	u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1272	u8 tx_chains_num = il->hw_params.tx_chains_num;
1273	int ret = 0;
1274	u8 update_search_tbl_counter = 0;
1275
1276	tbl->action = IL_LEGACY_SWITCH_SISO;
1277
1278	start_action = tbl->action;
1279	for (;;) {
1280	lq_sta->action_counter++;
1281	switch (tbl->action) {
1282	case IL_LEGACY_SWITCH_ANTENNA1:
1283	case IL_LEGACY_SWITCH_ANTENNA2:
1284	D_RATE("LQ: Legacy toggle Antenna\n");
1285
1286	if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
1287	tx_chains_num <= 1) ||
1288	(tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
1289	tx_chains_num <= 2))
1290	break;
1291
1292	/* Don't change antenna if success has been great */
1293	if (win->success_ratio >= IL_RS_GOOD_RATIO)
1294	break;
1295
1296	/* Set up search table to try other antenna */
1297	memcpy(search_tbl, tbl, sz);
1298
1299	if (il4965_rs_toggle_antenna
1300	(valid_ant: valid_tx_ant, rate_n_flags: &search_tbl->current_rate,
1301	tbl: search_tbl)) {
1302	update_search_tbl_counter = 1;
1303	il4965_rs_set_expected_tpt_table(lq_sta,
1304	tbl: search_tbl);
1305	goto out;
1306	}
1307	break;
1308	case IL_LEGACY_SWITCH_SISO:
1309	D_RATE("LQ: Legacy switch to SISO\n");
1310
1311	/* Set up search table to try SISO */
1312	memcpy(search_tbl, tbl, sz);
1313	search_tbl->is_SGI = 0;
1314	ret =
1315	il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1316	tbl: search_tbl, idx);
1317	if (!ret) {
1318	lq_sta->action_counter = 0;
1319	goto out;
1320	}
1321
1322	break;
1323	case IL_LEGACY_SWITCH_MIMO2_AB:
1324	case IL_LEGACY_SWITCH_MIMO2_AC:
1325	case IL_LEGACY_SWITCH_MIMO2_BC:
1326	D_RATE("LQ: Legacy switch to MIMO2\n");
1327
1328	/* Set up search table to try MIMO */
1329	memcpy(search_tbl, tbl, sz);
1330	search_tbl->is_SGI = 0;
1331
1332	if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
1333	search_tbl->ant_type = ANT_AB;
1334	else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
1335	search_tbl->ant_type = ANT_AC;
1336	else
1337	search_tbl->ant_type = ANT_BC;
1338
1339	if (!il4965_rs_is_valid_ant
1340	(valid_antenna: valid_tx_ant, ant_type: search_tbl->ant_type))
1341	break;
1342
1343	ret =
1344	il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1345	tbl: search_tbl, idx);
1346	if (!ret) {
1347	lq_sta->action_counter = 0;
1348	goto out;
1349	}
1350	break;
1351	}
1352	tbl->action++;
1353	if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1354	tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1355
1356	if (tbl->action == start_action)
1357	break;
1358
1359	}
1360	search_tbl->lq_type = LQ_NONE;
1361	return 0;
1362
1363	out:
1364	lq_sta->search_better_tbl = 1;
1365	tbl->action++;
1366	if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
1367	tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
1368	if (update_search_tbl_counter)
1369	search_tbl->action = tbl->action;
1370	return 0;
1371
1372	}
1373
1374	/*
1375	* Try to switch to new modulation mode from SISO
1376	*/
1377	static int
1378	il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1379	struct ieee80211_conf *conf,
1380	struct ieee80211_sta *sta, int idx)
1381	{
1382	u8 is_green = lq_sta->is_green;
1383	struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1384	struct il_scale_tbl_info *search_tbl =
1385	&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1386	struct il_rate_scale_data *win = &(tbl->win[idx]);
1387	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1388	u32 sz =
1389	(sizeof(struct il_scale_tbl_info) -
1390	(sizeof(struct il_rate_scale_data) * RATE_COUNT));
1391	u8 start_action;
1392	u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1393	u8 tx_chains_num = il->hw_params.tx_chains_num;
1394	u8 update_search_tbl_counter = 0;
1395	int ret;
1396
1397	start_action = tbl->action;
1398
1399	for (;;) {
1400	lq_sta->action_counter++;
1401	switch (tbl->action) {
1402	case IL_SISO_SWITCH_ANTENNA1:
1403	case IL_SISO_SWITCH_ANTENNA2:
1404	D_RATE("LQ: SISO toggle Antenna\n");
1405	if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
1406	tx_chains_num <= 1) ||
1407	(tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
1408	tx_chains_num <= 2))
1409	break;
1410
1411	if (win->success_ratio >= IL_RS_GOOD_RATIO)
1412	break;
1413
1414	memcpy(search_tbl, tbl, sz);
1415	if (il4965_rs_toggle_antenna
1416	(valid_ant: valid_tx_ant, rate_n_flags: &search_tbl->current_rate,
1417	tbl: search_tbl)) {
1418	update_search_tbl_counter = 1;
1419	goto out;
1420	}
1421	break;
1422	case IL_SISO_SWITCH_MIMO2_AB:
1423	case IL_SISO_SWITCH_MIMO2_AC:
1424	case IL_SISO_SWITCH_MIMO2_BC:
1425	D_RATE("LQ: SISO switch to MIMO2\n");
1426	memcpy(search_tbl, tbl, sz);
1427	search_tbl->is_SGI = 0;
1428
1429	if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
1430	search_tbl->ant_type = ANT_AB;
1431	else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
1432	search_tbl->ant_type = ANT_AC;
1433	else
1434	search_tbl->ant_type = ANT_BC;
1435
1436	if (!il4965_rs_is_valid_ant
1437	(valid_antenna: valid_tx_ant, ant_type: search_tbl->ant_type))
1438	break;
1439
1440	ret =
1441	il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
1442	tbl: search_tbl, idx);
1443	if (!ret)
1444	goto out;
1445	break;
1446	case IL_SISO_SWITCH_GI:
1447	if (!tbl->is_ht40 &&
1448	!(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1449	break;
1450	if (tbl->is_ht40 &&
1451	!(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1452	break;
1453
1454	D_RATE("LQ: SISO toggle SGI/NGI\n");
1455
1456	memcpy(search_tbl, tbl, sz);
1457	if (is_green) {
1458	if (!tbl->is_SGI)
1459	break;
1460	else
1461	IL_ERR("SGI was set in GF+SISO\n");
1462	}
1463	search_tbl->is_SGI = !tbl->is_SGI;
1464	il4965_rs_set_expected_tpt_table(lq_sta, tbl: search_tbl);
1465	if (tbl->is_SGI) {
1466	s32 tpt = lq_sta->last_tpt / 100;
1467	if (tpt >= search_tbl->expected_tpt[idx])
1468	break;
1469	}
1470	search_tbl->current_rate =
1471	il4965_rate_n_flags_from_tbl(il, tbl: search_tbl, idx,
1472	use_green: is_green);
1473	update_search_tbl_counter = 1;
1474	goto out;
1475	}
1476	tbl->action++;
1477	if (tbl->action > IL_SISO_SWITCH_GI)
1478	tbl->action = IL_SISO_SWITCH_ANTENNA1;
1479
1480	if (tbl->action == start_action)
1481	break;
1482	}
1483	search_tbl->lq_type = LQ_NONE;
1484	return 0;
1485
1486	out:
1487	lq_sta->search_better_tbl = 1;
1488	tbl->action++;
1489	if (tbl->action > IL_SISO_SWITCH_GI)
1490	tbl->action = IL_SISO_SWITCH_ANTENNA1;
1491	if (update_search_tbl_counter)
1492	search_tbl->action = tbl->action;
1493
1494	return 0;
1495	}
1496
1497	/*
1498	* Try to switch to new modulation mode from MIMO2
1499	*/
1500	static int
1501	il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
1502	struct ieee80211_conf *conf,
1503	struct ieee80211_sta *sta, int idx)
1504	{
1505	s8 is_green = lq_sta->is_green;
1506	struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1507	struct il_scale_tbl_info *search_tbl =
1508	&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1509	struct il_rate_scale_data *win = &(tbl->win[idx]);
1510	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
1511	u32 sz =
1512	(sizeof(struct il_scale_tbl_info) -
1513	(sizeof(struct il_rate_scale_data) * RATE_COUNT));
1514	u8 start_action;
1515	u8 valid_tx_ant = il->hw_params.valid_tx_ant;
1516	u8 tx_chains_num = il->hw_params.tx_chains_num;
1517	u8 update_search_tbl_counter = 0;
1518	int ret;
1519
1520	start_action = tbl->action;
1521	for (;;) {
1522	lq_sta->action_counter++;
1523	switch (tbl->action) {
1524	case IL_MIMO2_SWITCH_ANTENNA1:
1525	case IL_MIMO2_SWITCH_ANTENNA2:
1526	D_RATE("LQ: MIMO2 toggle Antennas\n");
1527
1528	if (tx_chains_num <= 2)
1529	break;
1530
1531	if (win->success_ratio >= IL_RS_GOOD_RATIO)
1532	break;
1533
1534	memcpy(search_tbl, tbl, sz);
1535	if (il4965_rs_toggle_antenna
1536	(valid_ant: valid_tx_ant, rate_n_flags: &search_tbl->current_rate,
1537	tbl: search_tbl)) {
1538	update_search_tbl_counter = 1;
1539	goto out;
1540	}
1541	break;
1542	case IL_MIMO2_SWITCH_SISO_A:
1543	case IL_MIMO2_SWITCH_SISO_B:
1544	case IL_MIMO2_SWITCH_SISO_C:
1545	D_RATE("LQ: MIMO2 switch to SISO\n");
1546
1547	/* Set up new search table for SISO */
1548	memcpy(search_tbl, tbl, sz);
1549
1550	if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
1551	search_tbl->ant_type = ANT_A;
1552	else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
1553	search_tbl->ant_type = ANT_B;
1554	else
1555	search_tbl->ant_type = ANT_C;
1556
1557	if (!il4965_rs_is_valid_ant
1558	(valid_antenna: valid_tx_ant, ant_type: search_tbl->ant_type))
1559	break;
1560
1561	ret =
1562	il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
1563	tbl: search_tbl, idx);
1564	if (!ret)
1565	goto out;
1566
1567	break;
1568
1569	case IL_MIMO2_SWITCH_GI:
1570	if (!tbl->is_ht40 &&
1571	!(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
1572	break;
1573	if (tbl->is_ht40 &&
1574	!(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
1575	break;
1576
1577	D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
1578
1579	/* Set up new search table for MIMO2 */
1580	memcpy(search_tbl, tbl, sz);
1581	search_tbl->is_SGI = !tbl->is_SGI;
1582	il4965_rs_set_expected_tpt_table(lq_sta, tbl: search_tbl);
1583	/*
1584	* If active table already uses the fastest possible
1585	* modulation (dual stream with short guard interval),
1586	* and it's working well, there's no need to look
1587	* for a better type of modulation!
1588	*/
1589	if (tbl->is_SGI) {
1590	s32 tpt = lq_sta->last_tpt / 100;
1591	if (tpt >= search_tbl->expected_tpt[idx])
1592	break;
1593	}
1594	search_tbl->current_rate =
1595	il4965_rate_n_flags_from_tbl(il, tbl: search_tbl, idx,
1596	use_green: is_green);
1597	update_search_tbl_counter = 1;
1598	goto out;
1599
1600	}
1601	tbl->action++;
1602	if (tbl->action > IL_MIMO2_SWITCH_GI)
1603	tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1604
1605	if (tbl->action == start_action)
1606	break;
1607	}
1608	search_tbl->lq_type = LQ_NONE;
1609	return 0;
1610	out:
1611	lq_sta->search_better_tbl = 1;
1612	tbl->action++;
1613	if (tbl->action > IL_MIMO2_SWITCH_GI)
1614	tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
1615	if (update_search_tbl_counter)
1616	search_tbl->action = tbl->action;
1617
1618	return 0;
1619
1620	}
1621
1622	/*
1623	* Check whether we should continue using same modulation mode, or
1624	* begin search for a new mode, based on:
1625	* 1) # tx successes or failures while using this mode
1626	* 2) # times calling this function
1627	* 3) elapsed time in this mode (not used, for now)
1628	*/
1629	static void
1630	il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
1631	{
1632	struct il_scale_tbl_info *tbl;
1633	int i;
1634	int active_tbl;
1635	int flush_interval_passed = 0;
1636	struct il_priv *il;
1637
1638	il = lq_sta->drv;
1639	active_tbl = lq_sta->active_tbl;
1640
1641	tbl = &(lq_sta->lq_info[active_tbl]);
1642
1643	/* If we've been disallowing search, see if we should now allow it */
1644	if (lq_sta->stay_in_tbl) {
1645
1646	/* Elapsed time using current modulation mode */
1647	if (lq_sta->flush_timer)
1648	flush_interval_passed =
1649	time_after(jiffies,
1650	(unsigned long)(lq_sta->flush_timer +
1651	RATE_SCALE_FLUSH_INTVL));
1652
1653	/*
1654	* Check if we should allow search for new modulation mode.
1655	* If many frames have failed or succeeded, or we've used
1656	* this same modulation for a long time, allow search, and
1657	* reset history stats that keep track of whether we should
1658	* allow a new search. Also (below) reset all bitmaps and
1659	* stats in active history.
1660	*/
1661	if (force_search ||
1662	lq_sta->total_failed > lq_sta->max_failure_limit ||
1663	lq_sta->total_success > lq_sta->max_success_limit ||
1664	(!lq_sta->search_better_tbl && lq_sta->flush_timer &&
1665	flush_interval_passed)) {
1666	D_RATE("LQ: stay is expired %d %d %d\n",
1667	lq_sta->total_failed, lq_sta->total_success,
1668	flush_interval_passed);
1669
1670	/* Allow search for new mode */
1671	lq_sta->stay_in_tbl = 0; /* only place reset */
1672	lq_sta->total_failed = 0;
1673	lq_sta->total_success = 0;
1674	lq_sta->flush_timer = 0;
1675
1676	/*
1677	* Else if we've used this modulation mode enough repetitions
1678	* (regardless of elapsed time or success/failure), reset
1679	* history bitmaps and rate-specific stats for all rates in
1680	* active table.
1681	*/
1682	} else {
1683	lq_sta->table_count++;
1684	if (lq_sta->table_count >= lq_sta->table_count_limit) {
1685	lq_sta->table_count = 0;
1686
1687	D_RATE("LQ: stay in table clear win\n");
1688	for (i = 0; i < RATE_COUNT; i++)
1689	il4965_rs_rate_scale_clear_win(win: &
1690	(tbl->
1691	win
1692	[i]));
1693	}
1694	}
1695
1696	/* If transitioning to allow "search", reset all history
1697	* bitmaps and stats in active table (this will become the new
1698	* "search" table). */
1699	if (!lq_sta->stay_in_tbl) {
1700	for (i = 0; i < RATE_COUNT; i++)
1701	il4965_rs_rate_scale_clear_win(win: &(tbl->win[i]));
1702	}
1703	}
1704	}
1705
1706	/*
1707	* setup rate table in uCode
1708	*/
1709	static void
1710	il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
1711	struct il_scale_tbl_info *tbl, int idx, u8 is_green)
1712	{
1713	u32 rate;
1714
1715	/* Update uCode's rate table. */
1716	rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, use_green: is_green);
1717	il4965_rs_fill_link_cmd(il, lq_sta, rate_n_flags: rate);
1718	il_send_lq_cmd(il, lq: &lq_sta->lq, flags: CMD_ASYNC, init: false);
1719	}
1720
1721	/*
1722	* Do rate scaling and search for new modulation mode.
1723	*/
1724	static void
1725	il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
1726	struct ieee80211_sta *sta,
1727	struct il_lq_sta *lq_sta)
1728	{
1729	struct ieee80211_hw *hw = il->hw;
1730	struct ieee80211_conf *conf = &hw->conf;
1731	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1732	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1733	int low = RATE_INVALID;
1734	int high = RATE_INVALID;
1735	int idx;
1736	int i;
1737	struct il_rate_scale_data *win = NULL;
1738	int current_tpt = IL_INVALID_VALUE;
1739	int low_tpt = IL_INVALID_VALUE;
1740	int high_tpt = IL_INVALID_VALUE;
1741	u32 fail_count;
1742	s8 scale_action = 0;
1743	u16 rate_mask;
1744	u8 update_lq = 0;
1745	struct il_scale_tbl_info *tbl, *tbl1;
1746	u16 rate_scale_idx_msk = 0;
1747	u8 is_green = 0;
1748	u8 active_tbl = 0;
1749	u8 done_search = 0;
1750	u16 high_low;
1751	s32 sr;
1752	u8 tid;
1753	struct il_tid_data *tid_data;
1754
1755	D_RATE("rate scale calculate new rate for skb\n");
1756
1757	/* Send management frames and NO_ACK data using lowest rate. */
1758	/* TODO: this could probably be improved.. */
1759	if (!ieee80211_is_data(fc: hdr->frame_control) ||
1760	(info->flags & IEEE80211_TX_CTL_NO_ACK))
1761	return;
1762
1763	lq_sta->supp_rates = sta->deflink.supp_rates[lq_sta->band];
1764
1765	tid = il4965_rs_tl_add_packet(lq_data: lq_sta, hdr);
1766	if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1767	tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
1768	if (tid_data->agg.state == IL_AGG_OFF)
1769	lq_sta->is_agg = 0;
1770	else
1771	lq_sta->is_agg = 1;
1772	} else
1773	lq_sta->is_agg = 0;
1774
1775	/*
1776	* Select rate-scale / modulation-mode table to work with in
1777	* the rest of this function: "search" if searching for better
1778	* modulation mode, or "active" if doing rate scaling within a mode.
1779	*/
1780	if (!lq_sta->search_better_tbl)
1781	active_tbl = lq_sta->active_tbl;
1782	else
1783	active_tbl = 1 - lq_sta->active_tbl;
1784
1785	tbl = &(lq_sta->lq_info[active_tbl]);
1786	if (is_legacy(tbl->lq_type))
1787	lq_sta->is_green = 0;
1788	else
1789	lq_sta->is_green = il4965_rs_use_green(il, sta);
1790	is_green = lq_sta->is_green;
1791
1792	/* current tx rate */
1793	idx = lq_sta->last_txrate_idx;
1794
1795	D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
1796
1797	/* rates available for this association, and for modulation mode */
1798	rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, rate_type: tbl->lq_type);
1799
1800	D_RATE("mask 0x%04X\n", rate_mask);
1801
1802	/* mask with station rate restriction */
1803	if (is_legacy(tbl->lq_type)) {
1804	if (lq_sta->band == NL80211_BAND_5GHZ)
1805	/* supp_rates has no CCK bits in A mode */
1806	rate_scale_idx_msk =
1807	(u16) (rate_mask &
1808	(lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
1809	else
1810	rate_scale_idx_msk =
1811	(u16) (rate_mask & lq_sta->supp_rates);
1812
1813	} else
1814	rate_scale_idx_msk = rate_mask;
1815
1816	if (!rate_scale_idx_msk)
1817	rate_scale_idx_msk = rate_mask;
1818
1819	if (!((1 << idx) & rate_scale_idx_msk)) {
1820	IL_ERR("Current Rate is not valid\n");
1821	if (lq_sta->search_better_tbl) {
1822	/* revert to active table if search table is not valid */
1823	tbl->lq_type = LQ_NONE;
1824	lq_sta->search_better_tbl = 0;
1825	tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1826	/* get "active" rate info */
1827	idx = il4965_hwrate_to_plcp_idx(rate_n_flags: tbl->current_rate);
1828	il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
1829	is_green);
1830	}
1831	return;
1832	}
1833
1834	/* Get expected throughput table and history win for current rate */
1835	if (!tbl->expected_tpt) {
1836	IL_ERR("tbl->expected_tpt is NULL\n");
1837	return;
1838	}
1839
1840	/* force user max rate if set by user */
1841	if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
1842	idx = lq_sta->max_rate_idx;
1843	update_lq = 1;
1844	win = &(tbl->win[idx]);
1845	goto lq_update;
1846	}
1847
1848	win = &(tbl->win[idx]);
1849
1850	/*
1851	* If there is not enough history to calculate actual average
1852	* throughput, keep analyzing results of more tx frames, without
1853	* changing rate or mode (bypass most of the rest of this function).
1854	* Set up new rate table in uCode only if old rate is not supported
1855	* in current association (use new rate found above).
1856	*/
1857	fail_count = win->counter - win->success_counter;
1858	if (fail_count < RATE_MIN_FAILURE_TH &&
1859	win->success_counter < RATE_MIN_SUCCESS_TH) {
1860	D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
1861	win->success_counter, win->counter, idx);
1862
1863	/* Can't calculate this yet; not enough history */
1864	win->average_tpt = IL_INVALID_VALUE;
1865
1866	/* Should we stay with this modulation mode,
1867	* or search for a new one? */
1868	il4965_rs_stay_in_table(lq_sta, force_search: false);
1869
1870	goto out;
1871	}
1872	/* Else we have enough samples; calculate estimate of
1873	* actual average throughput */
1874	if (win->average_tpt !=
1875	((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
1876	IL_ERR("expected_tpt should have been calculated by now\n");
1877	win->average_tpt =
1878	((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
1879	}
1880
1881	/* If we are searching for better modulation mode, check success. */
1882	if (lq_sta->search_better_tbl) {
1883	/* If good success, continue using the "search" mode;
1884	* no need to send new link quality command, since we're
1885	* continuing to use the setup that we've been trying. */
1886	if (win->average_tpt > lq_sta->last_tpt) {
1887
1888	D_RATE("LQ: SWITCHING TO NEW TBL "
1889	"suc=%d cur-tpt=%d old-tpt=%d\n",
1890	win->success_ratio, win->average_tpt,
1891	lq_sta->last_tpt);
1892
1893	if (!is_legacy(tbl->lq_type))
1894	lq_sta->enable_counter = 1;
1895
1896	/* Swap tables; "search" becomes "active" */
1897	lq_sta->active_tbl = active_tbl;
1898	current_tpt = win->average_tpt;
1899
1900	/* Else poor success; go back to mode in "active" table */
1901	} else {
1902
1903	D_RATE("LQ: GOING BACK TO THE OLD 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	/* Nullify "search" table */
1909	tbl->lq_type = LQ_NONE;
1910
1911	/* Revert to "active" table */
1912	active_tbl = lq_sta->active_tbl;
1913	tbl = &(lq_sta->lq_info[active_tbl]);
1914
1915	/* Revert to "active" rate and throughput info */
1916	idx = il4965_hwrate_to_plcp_idx(rate_n_flags: tbl->current_rate);
1917	current_tpt = lq_sta->last_tpt;
1918
1919	/* Need to set up a new rate table in uCode */
1920	update_lq = 1;
1921	}
1922
1923	/* Either way, we've made a decision; modulation mode
1924	* search is done, allow rate adjustment next time. */
1925	lq_sta->search_better_tbl = 0;
1926	done_search = 1; /* Don't switch modes below! */
1927	goto lq_update;
1928	}
1929
1930	/* (Else) not in search of better modulation mode, try for better
1931	* starting rate, while staying in this mode. */
1932	high_low =
1933	il4965_rs_get_adjacent_rate(il, idx, rate_mask: rate_scale_idx_msk,
1934	rate_type: tbl->lq_type);
1935	low = high_low & 0xff;
1936	high = (high_low >> 8) & 0xff;
1937
1938	/* If user set max rate, dont allow higher than user constrain */
1939	if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
1940	high = RATE_INVALID;
1941
1942	sr = win->success_ratio;
1943
1944	/* Collect measured throughputs for current and adjacent rates */
1945	current_tpt = win->average_tpt;
1946	if (low != RATE_INVALID)
1947	low_tpt = tbl->win[low].average_tpt;
1948	if (high != RATE_INVALID)
1949	high_tpt = tbl->win[high].average_tpt;
1950
1951	scale_action = 0;
1952
1953	/* Too many failures, decrease rate */
1954	if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
1955	D_RATE("decrease rate because of low success_ratio\n");
1956	scale_action = -1;
1957
1958	/* No throughput measured yet for adjacent rates; try increase. */
1959	} else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
1960
1961	if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
1962	scale_action = 1;
1963	else if (low != RATE_INVALID)
1964	scale_action = 0;
1965	}
1966
1967	/* Both adjacent throughputs are measured, but neither one has better
1968	* throughput; we're using the best rate, don't change it! */
1969	else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
1970	low_tpt < current_tpt && high_tpt < current_tpt)
1971	scale_action = 0;
1972
1973	/* At least one adjacent rate's throughput is measured,
1974	* and may have better performance. */
1975	else {
1976	/* Higher adjacent rate's throughput is measured */
1977	if (high_tpt != IL_INVALID_VALUE) {
1978	/* Higher rate has better throughput */
1979	if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
1980	scale_action = 1;
1981	else
1982	scale_action = 0;
1983
1984	/* Lower adjacent rate's throughput is measured */
1985	} else if (low_tpt != IL_INVALID_VALUE) {
1986	/* Lower rate has better throughput */
1987	if (low_tpt > current_tpt) {
1988	D_RATE("decrease rate because of low tpt\n");
1989	scale_action = -1;
1990	} else if (sr >= RATE_INCREASE_TH) {
1991	scale_action = 1;
1992	}
1993	}
1994	}
1995
1996	/* Sanity check; asked for decrease, but success rate or throughput
1997	* has been good at old rate. Don't change it. */
1998	if (scale_action == -1 && low != RATE_INVALID &&
1999	(sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
2000	scale_action = 0;
2001
2002	switch (scale_action) {
2003	case -1:
2004	/* Decrease starting rate, update uCode's rate table */
2005	if (low != RATE_INVALID) {
2006	update_lq = 1;
2007	idx = low;
2008	}
2009
2010	break;
2011	case 1:
2012	/* Increase starting rate, update uCode's rate table */
2013	if (high != RATE_INVALID) {
2014	update_lq = 1;
2015	idx = high;
2016	}
2017
2018	break;
2019	case 0:
2020	/* No change */
2021	default:
2022	break;
2023	}
2024
2025	D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
2026	idx, scale_action, low, high, tbl->lq_type);
2027
2028	lq_update:
2029	/* Replace uCode's rate table for the destination station. */
2030	if (update_lq)
2031	il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
2032
2033	/* Should we stay with this modulation mode,
2034	* or search for a new one? */
2035	il4965_rs_stay_in_table(lq_sta, force_search: false);
2036
2037	/*
2038	* Search for new modulation mode if we're:
2039	* 1) Not changing rates right now
2040	* 2) Not just finishing up a search
2041	* 3) Allowing a new search
2042	*/
2043	if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
2044	/* Save current throughput to compare with "search" throughput */
2045	lq_sta->last_tpt = current_tpt;
2046
2047	/* Select a new "search" modulation mode to try.
2048	* If one is found, set up the new "search" table. */
2049	if (is_legacy(tbl->lq_type))
2050	il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
2051	else if (is_siso(tbl->lq_type))
2052	il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
2053	idx);
2054	else /* (is_mimo2(tbl->lq_type)) */
2055	il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
2056	idx);
2057
2058	/* If new "search" mode was selected, set up in uCode table */
2059	if (lq_sta->search_better_tbl) {
2060	/* Access the "search" table, clear its history. */
2061	tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2062	for (i = 0; i < RATE_COUNT; i++)
2063	il4965_rs_rate_scale_clear_win(win: &(tbl->win[i]));
2064
2065	/* Use new "search" start rate */
2066	idx = il4965_hwrate_to_plcp_idx(rate_n_flags: tbl->current_rate);
2067
2068	D_RATE("Switch current mcs: %X idx: %d\n",
2069	tbl->current_rate, idx);
2070	il4965_rs_fill_link_cmd(il, lq_sta, rate_n_flags: tbl->current_rate);
2071	il_send_lq_cmd(il, lq: &lq_sta->lq, flags: CMD_ASYNC, init: false);
2072	} else
2073	done_search = 1;
2074	}
2075
2076	if (done_search && !lq_sta->stay_in_tbl) {
2077	/* If the "active" (non-search) mode was legacy,
2078	* and we've tried switching antennas,
2079	* but we haven't been able to try HT modes (not available),
2080	* stay with best antenna legacy modulation for a while
2081	* before next round of mode comparisons. */
2082	tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2083	if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2084	lq_sta->action_counter > tbl1->max_search) {
2085	D_RATE("LQ: STAY in legacy table\n");
2086	il4965_rs_set_stay_in_table(il, is_legacy: 1, lq_sta);
2087	}
2088
2089	/* If we're in an HT mode, and all 3 mode switch actions
2090	* have been tried and compared, stay in this best modulation
2091	* mode for a while before next round of mode comparisons. */
2092	if (lq_sta->enable_counter &&
2093	lq_sta->action_counter >= tbl1->max_search) {
2094	if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
2095	(lq_sta->tx_agg_tid_en & (1 << tid)) &&
2096	tid != MAX_TID_COUNT) {
2097	tid_data =
2098	&il->stations[lq_sta->lq.sta_id].tid[tid];
2099	if (tid_data->agg.state == IL_AGG_OFF) {
2100	D_RATE("try to aggregate tid %d\n",
2101	tid);
2102	il4965_rs_tl_turn_on_agg(il, tid,
2103	lq_data: lq_sta, sta);
2104	}
2105	}
2106	il4965_rs_set_stay_in_table(il, is_legacy: 0, lq_sta);
2107	}
2108	}
2109
2110	out:
2111	tbl->current_rate =
2112	il4965_rate_n_flags_from_tbl(il, tbl, idx, use_green: is_green);
2113	i = idx;
2114	lq_sta->last_txrate_idx = i;
2115	}
2116
2117	/*
2118	* il4965_rs_initialize_lq - Initialize a station's hardware rate table
2119	*
2120	* The uCode's station table contains a table of fallback rates
2121	* for automatic fallback during transmission.
2122	*
2123	* NOTE: This sets up a default set of values. These will be replaced later
2124	* if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
2125	* rc80211_simple.
2126	*
2127	* NOTE: Run C_ADD_STA command to set up station table entry, before
2128	* calling this function (which runs C_TX_LINK_QUALITY_CMD,
2129	* which requires station table entry to exist).
2130	*/
2131	static void
2132	il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
2133	struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
2134	{
2135	struct il_scale_tbl_info *tbl;
2136	int rate_idx;
2137	int i;
2138	u32 rate;
2139	u8 use_green;
2140	u8 active_tbl = 0;
2141	u8 valid_tx_ant;
2142
2143	if (!sta || !lq_sta)
2144	return;
2145
2146	use_green = il4965_rs_use_green(il, sta);
2147
2148	i = lq_sta->last_txrate_idx;
2149
2150	valid_tx_ant = il->hw_params.valid_tx_ant;
2151
2152	if (!lq_sta->search_better_tbl)
2153	active_tbl = lq_sta->active_tbl;
2154	else
2155	active_tbl = 1 - lq_sta->active_tbl;
2156
2157	tbl = &(lq_sta->lq_info[active_tbl]);
2158
2159	if (i < 0 || i >= RATE_COUNT)
2160	i = 0;
2161
2162	rate = il_rates[i].plcp;
2163	tbl->ant_type = il4965_first_antenna(mask: valid_tx_ant);
2164	rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2165
2166	if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
2167	rate |= RATE_MCS_CCK_MSK;
2168
2169	il4965_rs_get_tbl_info_from_mcs(rate_n_flags: rate, band: il->band, tbl, rate_idx: &rate_idx);
2170	if (!il4965_rs_is_valid_ant(valid_antenna: valid_tx_ant, ant_type: tbl->ant_type))
2171	il4965_rs_toggle_antenna(valid_ant: valid_tx_ant, rate_n_flags: &rate, tbl);
2172
2173	rate = il4965_rate_n_flags_from_tbl(il, tbl, idx: rate_idx, use_green);
2174	tbl->current_rate = rate;
2175	il4965_rs_set_expected_tpt_table(lq_sta, tbl);
2176	il4965_rs_fill_link_cmd(NULL, lq_sta, rate_n_flags: rate);
2177	il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2178	il_send_lq_cmd(il, lq: &lq_sta->lq, flags: CMD_SYNC, init: true);
2179	}
2180
2181	static void
2182	il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
2183	struct ieee80211_tx_rate_control *txrc)
2184	{
2185
2186	struct sk_buff *skb = txrc->skb;
2187	struct ieee80211_supported_band *sband = txrc->sband;
2188	struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
2189	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2190	struct il_lq_sta *lq_sta = il_sta;
2191	int rate_idx;
2192
2193	D_RATE("rate scale calculate new rate for skb\n");
2194
2195	/* Get max rate if user set max rate */
2196	if (lq_sta) {
2197	lq_sta->max_rate_idx = fls(x: txrc->rate_idx_mask) - 1;
2198	if (sband->band == NL80211_BAND_5GHZ &&
2199	lq_sta->max_rate_idx != -1)
2200	lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
2201	if (lq_sta->max_rate_idx < 0 ||
2202	lq_sta->max_rate_idx >= RATE_COUNT)
2203	lq_sta->max_rate_idx = -1;
2204	}
2205
2206	/* Treat uninitialized rate scaling data same as non-existing. */
2207	if (lq_sta && !lq_sta->drv) {
2208	D_RATE("Rate scaling not initialized yet.\n");
2209	il_sta = NULL;
2210	}
2211
2212	if (!lq_sta)
2213	return;
2214
2215	rate_idx = lq_sta->last_txrate_idx;
2216
2217	if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2218	rate_idx -= IL_FIRST_OFDM_RATE;
2219	/* 6M and 9M shared same MCS idx */
2220	rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2221	if (il4965_rs_extract_rate(rate_n_flags: lq_sta->last_rate_n_flags) >=
2222	RATE_MIMO2_6M_PLCP)
2223	rate_idx = rate_idx + MCS_IDX_PER_STREAM;
2224	info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2225	if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2226	info->control.rates[0].flags |=
2227	IEEE80211_TX_RC_SHORT_GI;
2228	if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2229	info->control.rates[0].flags |=
2230	IEEE80211_TX_RC_DUP_DATA;
2231	if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2232	info->control.rates[0].flags |=
2233	IEEE80211_TX_RC_40_MHZ_WIDTH;
2234	if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2235	info->control.rates[0].flags |=
2236	IEEE80211_TX_RC_GREEN_FIELD;
2237	} else {
2238	/* Check for invalid rates */
2239	if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
2240	(sband->band == NL80211_BAND_5GHZ &&
2241	rate_idx < IL_FIRST_OFDM_RATE))
2242	rate_idx = rate_lowest_index(sband, sta);
2243	/* On valid 5 GHz rate, adjust idx */
2244	else if (sband->band == NL80211_BAND_5GHZ)
2245	rate_idx -= IL_FIRST_OFDM_RATE;
2246	info->control.rates[0].flags = 0;
2247	}
2248	info->control.rates[0].idx = rate_idx;
2249	info->control.rates[0].count = 1;
2250	}
2251
2252	static void *
2253	il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
2254	{
2255	struct il_station_priv *sta_priv =
2256	(struct il_station_priv *)sta->drv_priv;
2257	struct il_priv *il;
2258
2259	il = (struct il_priv *)il_rate;
2260	D_RATE("create station rate scale win\n");
2261
2262	return &sta_priv->lq_sta;
2263	}
2264
2265	/*
2266	* Called after adding a new station to initialize rate scaling
2267	*/
2268	void
2269	il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
2270	{
2271	int i, j;
2272	struct ieee80211_hw *hw = il->hw;
2273	struct ieee80211_conf *conf = &il->hw->conf;
2274	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2275	struct il_station_priv *sta_priv;
2276	struct il_lq_sta *lq_sta;
2277	struct ieee80211_supported_band *sband;
2278
2279	sta_priv = (struct il_station_priv *)sta->drv_priv;
2280	lq_sta = &sta_priv->lq_sta;
2281	sband = hw->wiphy->bands[conf->chandef.chan->band];
2282
2283	lq_sta->lq.sta_id = sta_id;
2284
2285	for (j = 0; j < LQ_SIZE; j++)
2286	for (i = 0; i < RATE_COUNT; i++)
2287	il4965_rs_rate_scale_clear_win(win: &lq_sta->lq_info[j].
2288	win[i]);
2289
2290	lq_sta->flush_timer = 0;
2291	lq_sta->supp_rates = sta->deflink.supp_rates[sband->band];
2292	for (j = 0; j < LQ_SIZE; j++)
2293	for (i = 0; i < RATE_COUNT; i++)
2294	il4965_rs_rate_scale_clear_win(win: &lq_sta->lq_info[j].
2295	win[i]);
2296
2297	D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
2298	sta_id);
2299	/* TODO: what is a good starting rate for STA? About middle? Maybe not
2300	* the lowest or the highest rate.. Could consider using RSSI from
2301	* previous packets? Need to have IEEE 802.1X auth succeed immediately
2302	* after assoc.. */
2303
2304	lq_sta->is_dup = 0;
2305	lq_sta->max_rate_idx = -1;
2306	lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
2307	lq_sta->is_green = il4965_rs_use_green(il, sta);
2308	lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
2309	lq_sta->band = il->band;
2310	/*
2311	* active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2312	* supp_rates[] does not; shift to convert format, force 9 MBits off.
2313	*/
2314	lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2315	lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2316	lq_sta->active_siso_rate &= ~((u16) 0x2);
2317	lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
2318
2319	/* Same here */
2320	lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2321	lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2322	lq_sta->active_mimo2_rate &= ~((u16) 0x2);
2323	lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
2324
2325	/* These values will be overridden later */
2326	lq_sta->lq.general_params.single_stream_ant_msk =
2327	il4965_first_antenna(mask: il->hw_params.valid_tx_ant);
2328	lq_sta->lq.general_params.dual_stream_ant_msk =
2329	il->hw_params.valid_tx_ant & ~il4965_first_antenna(mask: il->hw_params.
2330	valid_tx_ant);
2331	if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2332	lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2333	} else if (il4965_num_of_ant(m: il->hw_params.valid_tx_ant) == 2) {
2334	lq_sta->lq.general_params.dual_stream_ant_msk =
2335	il->hw_params.valid_tx_ant;
2336	}
2337
2338	/* as default allow aggregation for all tids */
2339	lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
2340	lq_sta->drv = il;
2341
2342	/* Set last_txrate_idx to lowest rate */
2343	lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2344	if (sband->band == NL80211_BAND_5GHZ)
2345	lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
2346	lq_sta->is_agg = 0;
2347
2348	#ifdef CONFIG_MAC80211_DEBUGFS
2349	lq_sta->dbg_fixed_rate = 0;
2350	#endif
2351
2352	il4965_rs_initialize_lq(il, conf, sta, lq_sta);
2353	}
2354
2355	static void
2356	il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
2357	u32 new_rate)
2358	{
2359	struct il_scale_tbl_info tbl_type;
2360	int idx = 0;
2361	int rate_idx;
2362	int repeat_rate = 0;
2363	u8 ant_toggle_cnt = 0;
2364	u8 use_ht_possible = 1;
2365	u8 valid_tx_ant = 0;
2366	struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
2367
2368	/* Override starting rate (idx 0) if needed for debug purposes */
2369	il4965_rs_dbgfs_set_mcs(lq_sta, rate_n_flags: &new_rate, idx);
2370
2371	/* Interpret new_rate (rate_n_flags) */
2372	il4965_rs_get_tbl_info_from_mcs(rate_n_flags: new_rate, band: lq_sta->band, tbl: &tbl_type,
2373	rate_idx: &rate_idx);
2374
2375	/* How many times should we repeat the initial rate? */
2376	if (is_legacy(tbl_type.lq_type)) {
2377	ant_toggle_cnt = 1;
2378	repeat_rate = IL_NUMBER_TRY;
2379	} else {
2380	repeat_rate = IL_HT_NUMBER_TRY;
2381	}
2382
2383	lq_cmd->general_params.mimo_delimiter =
2384	is_mimo(tbl_type.lq_type) ? 1 : 0;
2385
2386	/* Fill 1st table entry (idx 0) */
2387	lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2388
2389	if (il4965_num_of_ant(m: tbl_type.ant_type) == 1) {
2390	lq_cmd->general_params.single_stream_ant_msk =
2391	tbl_type.ant_type;
2392	} else if (il4965_num_of_ant(m: tbl_type.ant_type) == 2) {
2393	lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
2394	}
2395	/* otherwise we don't modify the existing value */
2396	idx++;
2397	repeat_rate--;
2398	if (il)
2399	valid_tx_ant = il->hw_params.valid_tx_ant;
2400
2401	/* Fill rest of rate table */
2402	while (idx < LINK_QUAL_MAX_RETRY_NUM) {
2403	/* Repeat initial/next rate.
2404	* For legacy IL_NUMBER_TRY == 1, this loop will not execute.
2405	* For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
2406	while (repeat_rate > 0 && idx < (LINK_QUAL_MAX_RETRY_NUM - 1)) {
2407	if (is_legacy(tbl_type.lq_type)) {
2408	if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2409	ant_toggle_cnt++;
2410	else if (il &&
2411	il4965_rs_toggle_antenna(valid_ant: valid_tx_ant,
2412	rate_n_flags: &new_rate,
2413	tbl: &tbl_type))
2414	ant_toggle_cnt = 1;
2415	}
2416
2417	/* Override next rate if needed for debug purposes */
2418	il4965_rs_dbgfs_set_mcs(lq_sta, rate_n_flags: &new_rate, idx);
2419
2420	/* Fill next table entry */
2421	lq_cmd->rs_table[idx].rate_n_flags =
2422	cpu_to_le32(new_rate);
2423	repeat_rate--;
2424	idx++;
2425	}
2426
2427	il4965_rs_get_tbl_info_from_mcs(rate_n_flags: new_rate, band: lq_sta->band,
2428	tbl: &tbl_type, rate_idx: &rate_idx);
2429
2430	/* Indicate to uCode which entries might be MIMO.
2431	* If initial rate was MIMO, this will finally end up
2432	* as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2433	if (is_mimo(tbl_type.lq_type))
2434	lq_cmd->general_params.mimo_delimiter = idx;
2435
2436	/* Get next rate */
2437	new_rate =
2438	il4965_rs_get_lower_rate(lq_sta, tbl: &tbl_type, scale_idx: rate_idx,
2439	ht_possible: use_ht_possible);
2440
2441	/* How many times should we repeat the next rate? */
2442	if (is_legacy(tbl_type.lq_type)) {
2443	if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2444	ant_toggle_cnt++;
2445	else if (il &&
2446	il4965_rs_toggle_antenna(valid_ant: valid_tx_ant,
2447	rate_n_flags: &new_rate, tbl: &tbl_type))
2448	ant_toggle_cnt = 1;
2449
2450	repeat_rate = IL_NUMBER_TRY;
2451	} else {
2452	repeat_rate = IL_HT_NUMBER_TRY;
2453	}
2454
2455	/* Don't allow HT rates after next pass.
2456	* il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2457	use_ht_possible = 0;
2458
2459	/* Override next rate if needed for debug purposes */
2460	il4965_rs_dbgfs_set_mcs(lq_sta, rate_n_flags: &new_rate, idx);
2461
2462	/* Fill next table entry */
2463	lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
2464
2465	idx++;
2466	repeat_rate--;
2467	}
2468
2469	lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2470	lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2471
2472	lq_cmd->agg_params.agg_time_limit =
2473	cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2474	}
2475
2476	static void *
2477	il4965_rs_alloc(struct ieee80211_hw *hw)
2478	{
2479	return hw->priv;
2480	}
2481
2482	/* rate scale requires free function to be implemented */
2483	static void
2484	il4965_rs_free(void *il_rate)
2485	{
2486	return;
2487	}
2488
2489	static void
2490	il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
2491	{
2492	struct il_priv *il __maybe_unused = il_r;
2493
2494	D_RATE("enter\n");
2495	D_RATE("leave\n");
2496	}
2497
2498	#ifdef CONFIG_MAC80211_DEBUGFS
2499
2500	static void
2501	il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
2502	{
2503	struct il_priv *il;
2504	u8 valid_tx_ant;
2505	u8 ant_sel_tx;
2506
2507	il = lq_sta->drv;
2508	valid_tx_ant = il->hw_params.valid_tx_ant;
2509	if (lq_sta->dbg_fixed_rate) {
2510	ant_sel_tx =
2511	((lq_sta->
2512	dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2513	RATE_MCS_ANT_POS);
2514	if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2515	*rate_n_flags = lq_sta->dbg_fixed_rate;
2516	D_RATE("Fixed rate ON\n");
2517	} else {
2518	lq_sta->dbg_fixed_rate = 0;
2519	IL_ERR
2520	("Invalid antenna selection 0x%X, Valid is 0x%X\n",
2521	ant_sel_tx, valid_tx_ant);
2522	D_RATE("Fixed rate OFF\n");
2523	}
2524	} else {
2525	D_RATE("Fixed rate OFF\n");
2526	}
2527	}
2528
2529	static ssize_t
2530	il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
2531	const char __user *user_buf,
2532	size_t count, loff_t *ppos)
2533	{
2534	struct il_lq_sta *lq_sta = file->private_data;
2535	struct il_priv *il;
2536	char buf[64];
2537	size_t buf_size;
2538	u32 parsed_rate;
2539
2540	il = lq_sta->drv;
2541	memset(buf, 0, sizeof(buf));
2542	buf_size = min(count, sizeof(buf) - 1);
2543	if (copy_from_user(to: buf, from: user_buf, n: buf_size))
2544	return -EFAULT;
2545
2546	if (sscanf(buf, "%x", &parsed_rate) == 1)
2547	lq_sta->dbg_fixed_rate = parsed_rate;
2548	else
2549	lq_sta->dbg_fixed_rate = 0;
2550
2551	lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2552	lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2553	lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2554
2555	D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
2556	lq_sta->dbg_fixed_rate);
2557
2558	if (lq_sta->dbg_fixed_rate) {
2559	il4965_rs_fill_link_cmd(NULL, lq_sta, new_rate: lq_sta->dbg_fixed_rate);
2560	il_send_lq_cmd(il: lq_sta->drv, lq: &lq_sta->lq, flags: CMD_ASYNC, init: false);
2561	}
2562
2563	return count;
2564	}
2565
2566	static ssize_t
2567	il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
2568	size_t count, loff_t *ppos)
2569	{
2570	char *buff;
2571	int desc = 0;
2572	int i = 0;
2573	int idx = 0;
2574	ssize_t ret;
2575
2576	struct il_lq_sta *lq_sta = file->private_data;
2577	struct il_priv *il;
2578	struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2579
2580	il = lq_sta->drv;
2581	buff = kmalloc(size: 1024, GFP_KERNEL);
2582	if (!buff)
2583	return -ENOMEM;
2584
2585	desc += sprintf(buf: buff + desc, fmt: "sta_id %d\n", lq_sta->lq.sta_id);
2586	desc +=
2587	sprintf(buf: buff + desc, fmt: "failed=%d success=%d rate=0%X\n",
2588	lq_sta->total_failed, lq_sta->total_success,
2589	lq_sta->active_legacy_rate);
2590	desc +=
2591	sprintf(buf: buff + desc, fmt: "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
2592	desc +=
2593	sprintf(buf: buff + desc, fmt: "valid_tx_ant %s%s%s\n",
2594	(il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2595	(il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2596	(il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2597	desc +=
2598	sprintf(buf: buff + desc, fmt: "lq type %s\n",
2599	(is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2600	if (is_Ht(tbl->lq_type)) {
2601	desc +=
2602	sprintf(buf: buff + desc, fmt: " %s",
2603	(is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2604	desc +=
2605	sprintf(buf: buff + desc, fmt: " %s",
2606	(tbl->is_ht40) ? "40MHz" : "20MHz");
2607	desc +=
2608	sprintf(buf: buff + desc, fmt: " %s %s %s\n",
2609	(tbl->is_SGI) ? "SGI" : "",
2610	(lq_sta->is_green) ? "GF enabled" : "",
2611	(lq_sta->is_agg) ? "AGG on" : "");
2612	}
2613	desc +=
2614	sprintf(buf: buff + desc, fmt: "last tx rate=0x%X\n",
2615	lq_sta->last_rate_n_flags);
2616	desc +=
2617	sprintf(buf: buff + desc,
2618	fmt: "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2619	lq_sta->lq.general_params.flags,
2620	lq_sta->lq.general_params.mimo_delimiter,
2621	lq_sta->lq.general_params.single_stream_ant_msk,
2622	lq_sta->lq.general_params.dual_stream_ant_msk);
2623
2624	desc +=
2625	sprintf(buf: buff + desc,
2626	fmt: "agg:"
2627	"time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2628	le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2629	lq_sta->lq.agg_params.agg_dis_start_th,
2630	lq_sta->lq.agg_params.agg_frame_cnt_limit);
2631
2632	desc +=
2633	sprintf(buf: buff + desc,
2634	fmt: "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2635	lq_sta->lq.general_params.start_rate_idx[0],
2636	lq_sta->lq.general_params.start_rate_idx[1],
2637	lq_sta->lq.general_params.start_rate_idx[2],
2638	lq_sta->lq.general_params.start_rate_idx[3]);
2639
2640	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2641	idx =
2642	il4965_hwrate_to_plcp_idx(le32_to_cpu
2643	(lq_sta->lq.rs_table[i].
2644	rate_n_flags));
2645	if (is_legacy(tbl->lq_type)) {
2646	desc +=
2647	sprintf(buf: buff + desc, fmt: " rate[%d] 0x%X %smbps\n", i,
2648	le32_to_cpu(lq_sta->lq.rs_table[i].
2649	rate_n_flags),
2650	il_rate_mcs[idx].mbps);
2651	} else {
2652	desc +=
2653	sprintf(buf: buff + desc, fmt: " rate[%d] 0x%X %smbps (%s)\n",
2654	i,
2655	le32_to_cpu(lq_sta->lq.rs_table[i].
2656	rate_n_flags),
2657	il_rate_mcs[idx].mbps,
2658	il_rate_mcs[idx].mcs);
2659	}
2660	}
2661
2662	ret = simple_read_from_buffer(to: user_buf, count, ppos, from: buff, available: desc);
2663	kfree(objp: buff);
2664	return ret;
2665	}
2666
2667	static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2668	.write = il4965_rs_sta_dbgfs_scale_table_write,
2669	.read = il4965_rs_sta_dbgfs_scale_table_read,
2670	.open = simple_open,
2671	.llseek = default_llseek,
2672	};
2673
2674	static ssize_t
2675	il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
2676	size_t count, loff_t *ppos)
2677	{
2678	char *buff;
2679	int desc = 0;
2680	int i, j;
2681	ssize_t ret;
2682
2683	struct il_lq_sta *lq_sta = file->private_data;
2684
2685	buff = kmalloc(size: 1024, GFP_KERNEL);
2686	if (!buff)
2687	return -ENOMEM;
2688
2689	for (i = 0; i < LQ_SIZE; i++) {
2690	desc +=
2691	sprintf(buf: buff + desc,
2692	fmt: "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2693	"rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
2694	lq_sta->lq_info[i].lq_type,
2695	lq_sta->lq_info[i].is_SGI,
2696	lq_sta->lq_info[i].is_ht40,
2697	lq_sta->lq_info[i].is_dup, lq_sta->is_green,
2698	lq_sta->lq_info[i].current_rate);
2699	for (j = 0; j < RATE_COUNT; j++) {
2700	desc +=
2701	sprintf(buf: buff + desc,
2702	fmt: "counter=%d success=%d %%=%d\n",
2703	lq_sta->lq_info[i].win[j].counter,
2704	lq_sta->lq_info[i].win[j].success_counter,
2705	lq_sta->lq_info[i].win[j].success_ratio);
2706	}
2707	}
2708	ret = simple_read_from_buffer(to: user_buf, count, ppos, from: buff, available: desc);
2709	kfree(objp: buff);
2710	return ret;
2711	}
2712
2713	static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2714	.read = il4965_rs_sta_dbgfs_stats_table_read,
2715	.open = simple_open,
2716	.llseek = default_llseek,
2717	};
2718
2719	static ssize_t
2720	il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2721	char __user *user_buf, size_t count,
2722	loff_t *ppos)
2723	{
2724	char buff[120];
2725	int desc = 0;
2726	struct il_lq_sta *lq_sta = file->private_data;
2727	struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2728
2729	if (is_Ht(tbl->lq_type))
2730	desc +=
2731	sprintf(buf: buff + desc, fmt: "Bit Rate= %d Mb/s\n",
2732	tbl->expected_tpt[lq_sta->last_txrate_idx]);
2733	else
2734	desc +=
2735	sprintf(buf: buff + desc, fmt: "Bit Rate= %d Mb/s\n",
2736	il_rates[lq_sta->last_txrate_idx].ieee >> 1);
2737
2738	return simple_read_from_buffer(to: user_buf, count, ppos, from: buff, available: desc);
2739	}
2740
2741	static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2742	.read = il4965_rs_sta_dbgfs_rate_scale_data_read,
2743	.open = simple_open,
2744	.llseek = default_llseek,
2745	};
2746
2747	static void
2748	il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
2749	{
2750	struct il_lq_sta *lq_sta = il_sta;
2751
2752	debugfs_create_file(name: "rate_scale_table", mode: 0600, parent: dir, data: lq_sta,
2753	fops: &rs_sta_dbgfs_scale_table_ops);
2754	debugfs_create_file(name: "rate_stats_table", mode: 0400, parent: dir, data: lq_sta,
2755	fops: &rs_sta_dbgfs_stats_table_ops);
2756	debugfs_create_file(name: "rate_scale_data", mode: 0400, parent: dir, data: lq_sta,
2757	fops: &rs_sta_dbgfs_rate_scale_data_ops);
2758	debugfs_create_u8(name: "tx_agg_tid_enable", mode: 0600, parent: dir,
2759	value: &lq_sta->tx_agg_tid_en);
2760	}
2761	#endif
2762
2763	/*
2764	* Initialization of rate scaling information is done by driver after
2765	* the station is added. Since mac80211 calls this function before a
2766	* station is added we ignore it.
2767	*/
2768	static void
2769	il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
2770	struct cfg80211_chan_def *chandef,
2771	struct ieee80211_sta *sta, void *il_sta)
2772	{
2773	}
2774
2775	static const struct rate_control_ops rs_4965_ops = {
2776	.name = IL4965_RS_NAME,
2777	.tx_status = il4965_rs_tx_status,
2778	.get_rate = il4965_rs_get_rate,
2779	.rate_init = il4965_rs_rate_init_stub,
2780	.alloc = il4965_rs_alloc,
2781	.free = il4965_rs_free,
2782	.alloc_sta = il4965_rs_alloc_sta,
2783	.free_sta = il4965_rs_free_sta,
2784	#ifdef CONFIG_MAC80211_DEBUGFS
2785	.add_sta_debugfs = il4965_rs_add_debugfs,
2786	#endif
2787	};
2788
2789	int
2790	il4965_rate_control_register(void)
2791	{
2792	return ieee80211_rate_control_register(ops: &rs_4965_ops);
2793	}
2794
2795	void
2796	il4965_rate_control_unregister(void)
2797	{
2798	ieee80211_rate_control_unregister(ops: &rs_4965_ops);
2799	}
2800