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1 /******************************************************************************
2  *
3  * Copyright(c) 2005 - 2014 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 "dev.h"
38 #include "agn.h"
39 
40 #define RS_NAME "iwl-agn-rs"
41 
42 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
43 #define IWL_NUMBER_TRY      1
44 #define IWL_HT_NUMBER_TRY   3
45 
46 #define IWL_RATE_MAX_WINDOW		62	/* # tx in history window */
47 #define IWL_RATE_MIN_FAILURE_TH		6	/* min failures to calc tpt */
48 #define IWL_RATE_MIN_SUCCESS_TH		8	/* min successes to calc tpt */
49 
50 /* max allowed rate miss before sync LQ cmd */
51 #define IWL_MISSED_RATE_MAX		15
52 /* max time to accum history 2 seconds */
53 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
54 
55 static u8 rs_ht_to_legacy[] = {
56 	IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
57 	IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 	IWL_RATE_6M_INDEX,
59 	IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
60 	IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
61 	IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
62 	IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
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 IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
77 	[IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
78 				    IWL_RATE_SISO_##s##M_PLCP, \
79 				    IWL_RATE_MIMO2_##s##M_PLCP,\
80 				    IWL_RATE_MIMO3_##s##M_PLCP,\
81 				    IWL_RATE_##r##M_IEEE,      \
82 				    IWL_RATE_##ip##M_INDEX,    \
83 				    IWL_RATE_##in##M_INDEX,    \
84 				    IWL_RATE_##rp##M_INDEX,    \
85 				    IWL_RATE_##rn##M_INDEX,    \
86 				    IWL_RATE_##pp##M_INDEX,    \
87 				    IWL_RATE_##np##M_INDEX }
88 
89 /*
90  * Parameter order:
91  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
92  *
93  * If there isn't a valid next or previous rate then INV is used which
94  * maps to IWL_RATE_INVALID
95  *
96  */
97 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
98 	IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
99 	IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
100 	IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
101 	IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
102 	IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
103 	IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
104 	IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
105 	IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
106 	IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
107 	IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
108 	IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
109 	IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
110 	IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
111 	/* FIXME:RS:          ^^    should be INV (legacy) */
112 };
113 
rs_extract_rate(u32 rate_n_flags)114 static inline u8 rs_extract_rate(u32 rate_n_flags)
115 {
116 	return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
117 }
118 
iwl_hwrate_to_plcp_idx(u32 rate_n_flags)119 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
120 {
121 	int idx = 0;
122 
123 	/* HT rate format */
124 	if (rate_n_flags & RATE_MCS_HT_MSK) {
125 		idx = rs_extract_rate(rate_n_flags);
126 
127 		if (idx >= IWL_RATE_MIMO3_6M_PLCP)
128 			idx = idx - IWL_RATE_MIMO3_6M_PLCP;
129 		else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
130 			idx = idx - IWL_RATE_MIMO2_6M_PLCP;
131 
132 		idx += IWL_FIRST_OFDM_RATE;
133 		/* skip 9M not supported in ht*/
134 		if (idx >= IWL_RATE_9M_INDEX)
135 			idx += 1;
136 		if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
137 			return idx;
138 
139 	/* legacy rate format, search for match in table */
140 	} else {
141 		for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
142 			if (iwl_rates[idx].plcp ==
143 					rs_extract_rate(rate_n_flags))
144 				return idx;
145 	}
146 
147 	return -1;
148 }
149 
150 static void rs_rate_scale_perform(struct iwl_priv *priv,
151 				   struct sk_buff *skb,
152 				   struct ieee80211_sta *sta,
153 				   struct iwl_lq_sta *lq_sta);
154 static void rs_fill_link_cmd(struct iwl_priv *priv,
155 			     struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
156 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
157 
158 
159 #ifdef CONFIG_MAC80211_DEBUGFS
160 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
161 			     u32 *rate_n_flags, int index);
162 #else
rs_dbgfs_set_mcs(struct iwl_lq_sta * lq_sta,u32 * rate_n_flags,int index)163 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
164 			     u32 *rate_n_flags, int index)
165 {}
166 #endif
167 
168 /**
169  * The following tables contain the expected throughput metrics for all rates
170  *
171  *	1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
172  *
173  * where invalid entries are zeros.
174  *
175  * CCK rates are only valid in legacy table and will only be used in G
176  * (2.4 GHz) band.
177  */
178 
179 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
180 	7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
181 };
182 
183 static const u16 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
184 	{0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
185 	{0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
186 	{0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
187 	{0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
188 };
189 
190 static const u16 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
191 	{0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
192 	{0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
193 	{0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
194 	{0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
195 };
196 
197 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
198 	{0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
199 	{0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
200 	{0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
201 	{0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
202 };
203 
204 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
205 	{0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
206 	{0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
207 	{0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
208 	{0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
209 };
210 
211 static const u16 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
212 	{0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
213 	{0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
214 	{0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
215 	{0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
216 };
217 
218 static const u16 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
219 	{0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
220 	{0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
221 	{0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
222 	{0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
223 };
224 
225 /* mbps, mcs */
226 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
227 	{  "1", "BPSK DSSS"},
228 	{  "2", "QPSK DSSS"},
229 	{"5.5", "BPSK CCK"},
230 	{ "11", "QPSK CCK"},
231 	{  "6", "BPSK 1/2"},
232 	{  "9", "BPSK 1/2"},
233 	{ "12", "QPSK 1/2"},
234 	{ "18", "QPSK 3/4"},
235 	{ "24", "16QAM 1/2"},
236 	{ "36", "16QAM 3/4"},
237 	{ "48", "64QAM 2/3"},
238 	{ "54", "64QAM 3/4"},
239 	{ "60", "64QAM 5/6"},
240 };
241 
242 #define MCS_INDEX_PER_STREAM	(8)
243 
rs_rate_scale_clear_window(struct iwl_rate_scale_data * window)244 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
245 {
246 	window->data = 0;
247 	window->success_counter = 0;
248 	window->success_ratio = IWL_INVALID_VALUE;
249 	window->counter = 0;
250 	window->average_tpt = IWL_INVALID_VALUE;
251 	window->stamp = 0;
252 }
253 
rs_is_valid_ant(u8 valid_antenna,u8 ant_type)254 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
255 {
256 	return (ant_type & valid_antenna) == ant_type;
257 }
258 
259 /*
260  *	removes the old data from the statistics. All data that is older than
261  *	TID_MAX_TIME_DIFF, will be deleted.
262  */
rs_tl_rm_old_stats(struct iwl_traffic_load * tl,u32 curr_time)263 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
264 {
265 	/* The oldest age we want to keep */
266 	u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
267 
268 	while (tl->queue_count &&
269 	       (tl->time_stamp < oldest_time)) {
270 		tl->total -= tl->packet_count[tl->head];
271 		tl->packet_count[tl->head] = 0;
272 		tl->time_stamp += TID_QUEUE_CELL_SPACING;
273 		tl->queue_count--;
274 		tl->head++;
275 		if (tl->head >= TID_QUEUE_MAX_SIZE)
276 			tl->head = 0;
277 	}
278 }
279 
280 /*
281  *	increment traffic load value for tid and also remove
282  *	any old values if passed the certain time period
283  */
rs_tl_add_packet(struct iwl_lq_sta * lq_data,struct ieee80211_hdr * hdr)284 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
285 			   struct ieee80211_hdr *hdr)
286 {
287 	u32 curr_time = jiffies_to_msecs(jiffies);
288 	u32 time_diff;
289 	s32 index;
290 	struct iwl_traffic_load *tl = NULL;
291 	u8 tid;
292 
293 	if (ieee80211_is_data_qos(hdr->frame_control)) {
294 		u8 *qc = ieee80211_get_qos_ctl(hdr);
295 		tid = qc[0] & 0xf;
296 	} else
297 		return IWL_MAX_TID_COUNT;
298 
299 	if (unlikely(tid >= IWL_MAX_TID_COUNT))
300 		return IWL_MAX_TID_COUNT;
301 
302 	tl = &lq_data->load[tid];
303 
304 	curr_time -= curr_time % TID_ROUND_VALUE;
305 
306 	/* Happens only for the first packet. Initialize the data */
307 	if (!(tl->queue_count)) {
308 		tl->total = 1;
309 		tl->time_stamp = curr_time;
310 		tl->queue_count = 1;
311 		tl->head = 0;
312 		tl->packet_count[0] = 1;
313 		return IWL_MAX_TID_COUNT;
314 	}
315 
316 	time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
317 	index = time_diff / TID_QUEUE_CELL_SPACING;
318 
319 	/* The history is too long: remove data that is older than */
320 	/* TID_MAX_TIME_DIFF */
321 	if (index >= TID_QUEUE_MAX_SIZE)
322 		rs_tl_rm_old_stats(tl, curr_time);
323 
324 	index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
325 	tl->packet_count[index] = tl->packet_count[index] + 1;
326 	tl->total = tl->total + 1;
327 
328 	if ((index + 1) > tl->queue_count)
329 		tl->queue_count = index + 1;
330 
331 	return tid;
332 }
333 
334 #ifdef CONFIG_MAC80211_DEBUGFS
335 /**
336  * Program the device to use fixed rate for frame transmit
337  * This is for debugging/testing only
338  * once the device start use fixed rate, we need to reload the module
339  * to being back the normal operation.
340  */
rs_program_fix_rate(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta)341 static void rs_program_fix_rate(struct iwl_priv *priv,
342 				struct iwl_lq_sta *lq_sta)
343 {
344 	struct iwl_station_priv *sta_priv =
345 		container_of(lq_sta, struct iwl_station_priv, lq_sta);
346 	struct iwl_rxon_context *ctx = sta_priv->ctx;
347 
348 	lq_sta->active_legacy_rate = 0x0FFF;	/* 1 - 54 MBits, includes CCK */
349 	lq_sta->active_siso_rate   = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
350 	lq_sta->active_mimo2_rate  = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
351 	lq_sta->active_mimo3_rate  = 0x1FD0;	/* 6 - 60 MBits, no 9, no CCK */
352 
353 	IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
354 		lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
355 
356 	if (lq_sta->dbg_fixed_rate) {
357 		rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
358 		iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
359 				false);
360 	}
361 }
362 #endif
363 
364 /*
365 	get the traffic load value for tid
366 */
rs_tl_get_load(struct iwl_lq_sta * lq_data,u8 tid)367 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
368 {
369 	u32 curr_time = jiffies_to_msecs(jiffies);
370 	u32 time_diff;
371 	s32 index;
372 	struct iwl_traffic_load *tl = NULL;
373 
374 	if (tid >= IWL_MAX_TID_COUNT)
375 		return 0;
376 
377 	tl = &(lq_data->load[tid]);
378 
379 	curr_time -= curr_time % TID_ROUND_VALUE;
380 
381 	if (!(tl->queue_count))
382 		return 0;
383 
384 	time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
385 	index = time_diff / TID_QUEUE_CELL_SPACING;
386 
387 	/* The history is too long: remove data that is older than */
388 	/* TID_MAX_TIME_DIFF */
389 	if (index >= TID_QUEUE_MAX_SIZE)
390 		rs_tl_rm_old_stats(tl, curr_time);
391 
392 	return tl->total;
393 }
394 
rs_tl_turn_on_agg_for_tid(struct iwl_priv * priv,struct iwl_lq_sta * lq_data,u8 tid,struct ieee80211_sta * sta)395 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
396 				      struct iwl_lq_sta *lq_data, u8 tid,
397 				      struct ieee80211_sta *sta)
398 {
399 	int ret = -EAGAIN;
400 	u32 load;
401 
402 	/*
403 	 * Don't create TX aggregation sessions when in high
404 	 * BT traffic, as they would just be disrupted by BT.
405 	 */
406 	if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
407 		IWL_DEBUG_COEX(priv,
408 			       "BT traffic (%d), no aggregation allowed\n",
409 			       priv->bt_traffic_load);
410 		return ret;
411 	}
412 
413 	load = rs_tl_get_load(lq_data, tid);
414 
415 	IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
416 			sta->addr, tid);
417 	ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
418 	if (ret == -EAGAIN) {
419 		/*
420 		 * driver and mac80211 is out of sync
421 		 * this might be cause by reloading firmware
422 		 * stop the tx ba session here
423 		 */
424 		IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
425 			tid);
426 		ieee80211_stop_tx_ba_session(sta, tid);
427 	}
428 	return ret;
429 }
430 
rs_tl_turn_on_agg(struct iwl_priv * priv,u8 tid,struct iwl_lq_sta * lq_data,struct ieee80211_sta * sta)431 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
432 			      struct iwl_lq_sta *lq_data,
433 			      struct ieee80211_sta *sta)
434 {
435 	if (tid < IWL_MAX_TID_COUNT)
436 		rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
437 	else
438 		IWL_ERR(priv, "tid exceeds max TID count: %d/%d\n",
439 			tid, IWL_MAX_TID_COUNT);
440 }
441 
get_num_of_ant_from_rate(u32 rate_n_flags)442 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
443 {
444 	return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
445 	       !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
446 	       !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
447 }
448 
449 /*
450  * Static function to get the expected throughput from an iwl_scale_tbl_info
451  * that wraps a NULL pointer check
452  */
get_expected_tpt(struct iwl_scale_tbl_info * tbl,int rs_index)453 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
454 {
455 	if (tbl->expected_tpt)
456 		return tbl->expected_tpt[rs_index];
457 	return 0;
458 }
459 
460 /**
461  * rs_collect_tx_data - Update the success/failure sliding window
462  *
463  * We keep a sliding window of the last 62 packets transmitted
464  * at this rate.  window->data contains the bitmask of successful
465  * packets.
466  */
rs_collect_tx_data(struct iwl_scale_tbl_info * tbl,int scale_index,int attempts,int successes)467 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
468 			      int scale_index, int attempts, int successes)
469 {
470 	struct iwl_rate_scale_data *window = NULL;
471 	static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
472 	s32 fail_count, tpt;
473 
474 	if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
475 		return -EINVAL;
476 
477 	/* Select window for current tx bit rate */
478 	window = &(tbl->win[scale_index]);
479 
480 	/* Get expected throughput */
481 	tpt = get_expected_tpt(tbl, scale_index);
482 
483 	/*
484 	 * Keep track of only the latest 62 tx frame attempts in this rate's
485 	 * history window; anything older isn't really relevant any more.
486 	 * If we have filled up the sliding window, drop the oldest attempt;
487 	 * if the oldest attempt (highest bit in bitmap) shows "success",
488 	 * subtract "1" from the success counter (this is the main reason
489 	 * we keep these bitmaps!).
490 	 */
491 	while (attempts > 0) {
492 		if (window->counter >= IWL_RATE_MAX_WINDOW) {
493 
494 			/* remove earliest */
495 			window->counter = IWL_RATE_MAX_WINDOW - 1;
496 
497 			if (window->data & mask) {
498 				window->data &= ~mask;
499 				window->success_counter--;
500 			}
501 		}
502 
503 		/* Increment frames-attempted counter */
504 		window->counter++;
505 
506 		/* Shift bitmap by one frame to throw away oldest history */
507 		window->data <<= 1;
508 
509 		/* Mark the most recent #successes attempts as successful */
510 		if (successes > 0) {
511 			window->success_counter++;
512 			window->data |= 0x1;
513 			successes--;
514 		}
515 
516 		attempts--;
517 	}
518 
519 	/* Calculate current success ratio, avoid divide-by-0! */
520 	if (window->counter > 0)
521 		window->success_ratio = 128 * (100 * window->success_counter)
522 					/ window->counter;
523 	else
524 		window->success_ratio = IWL_INVALID_VALUE;
525 
526 	fail_count = window->counter - window->success_counter;
527 
528 	/* Calculate average throughput, if we have enough history. */
529 	if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
530 	    (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
531 		window->average_tpt = (window->success_ratio * tpt + 64) / 128;
532 	else
533 		window->average_tpt = IWL_INVALID_VALUE;
534 
535 	/* Tag this window as having been updated */
536 	window->stamp = jiffies;
537 
538 	return 0;
539 }
540 
541 /*
542  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
543  */
544 /* FIXME:RS:remove this function and put the flags statically in the table */
rate_n_flags_from_tbl(struct iwl_priv * priv,struct iwl_scale_tbl_info * tbl,int index,u8 use_green)545 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
546 				 struct iwl_scale_tbl_info *tbl,
547 				 int index, u8 use_green)
548 {
549 	u32 rate_n_flags = 0;
550 
551 	if (is_legacy(tbl->lq_type)) {
552 		rate_n_flags = iwl_rates[index].plcp;
553 		if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
554 			rate_n_flags |= RATE_MCS_CCK_MSK;
555 
556 	} else if (is_Ht(tbl->lq_type)) {
557 		if (index > IWL_LAST_OFDM_RATE) {
558 			IWL_ERR(priv, "Invalid HT rate index %d\n", index);
559 			index = IWL_LAST_OFDM_RATE;
560 		}
561 		rate_n_flags = RATE_MCS_HT_MSK;
562 
563 		if (is_siso(tbl->lq_type))
564 			rate_n_flags |=	iwl_rates[index].plcp_siso;
565 		else if (is_mimo2(tbl->lq_type))
566 			rate_n_flags |=	iwl_rates[index].plcp_mimo2;
567 		else
568 			rate_n_flags |=	iwl_rates[index].plcp_mimo3;
569 	} else {
570 		IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
571 	}
572 
573 	rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
574 						     RATE_MCS_ANT_ABC_MSK);
575 
576 	if (is_Ht(tbl->lq_type)) {
577 		if (tbl->is_ht40) {
578 			if (tbl->is_dup)
579 				rate_n_flags |= RATE_MCS_DUP_MSK;
580 			else
581 				rate_n_flags |= RATE_MCS_HT40_MSK;
582 		}
583 		if (tbl->is_SGI)
584 			rate_n_flags |= RATE_MCS_SGI_MSK;
585 
586 		if (use_green) {
587 			rate_n_flags |= RATE_MCS_GF_MSK;
588 			if (is_siso(tbl->lq_type) && tbl->is_SGI) {
589 				rate_n_flags &= ~RATE_MCS_SGI_MSK;
590 				IWL_ERR(priv, "GF was set with SGI:SISO\n");
591 			}
592 		}
593 	}
594 	return rate_n_flags;
595 }
596 
597 /*
598  * Interpret uCode API's rate_n_flags format,
599  * fill "search" or "active" tx mode table.
600  */
rs_get_tbl_info_from_mcs(const u32 rate_n_flags,enum ieee80211_band band,struct iwl_scale_tbl_info * tbl,int * rate_idx)601 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
602 				    enum ieee80211_band band,
603 				    struct iwl_scale_tbl_info *tbl,
604 				    int *rate_idx)
605 {
606 	u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
607 	u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
608 	u8 mcs;
609 
610 	memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
611 	*rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
612 
613 	if (*rate_idx  == IWL_RATE_INVALID) {
614 		*rate_idx = -1;
615 		return -EINVAL;
616 	}
617 	tbl->is_SGI = 0;	/* default legacy setup */
618 	tbl->is_ht40 = 0;
619 	tbl->is_dup = 0;
620 	tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
621 	tbl->lq_type = LQ_NONE;
622 	tbl->max_search = IWL_MAX_SEARCH;
623 
624 	/* legacy rate format */
625 	if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
626 		if (num_of_ant == 1) {
627 			if (band == IEEE80211_BAND_5GHZ)
628 				tbl->lq_type = LQ_A;
629 			else
630 				tbl->lq_type = LQ_G;
631 		}
632 	/* HT rate format */
633 	} else {
634 		if (rate_n_flags & RATE_MCS_SGI_MSK)
635 			tbl->is_SGI = 1;
636 
637 		if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
638 		    (rate_n_flags & RATE_MCS_DUP_MSK))
639 			tbl->is_ht40 = 1;
640 
641 		if (rate_n_flags & RATE_MCS_DUP_MSK)
642 			tbl->is_dup = 1;
643 
644 		mcs = rs_extract_rate(rate_n_flags);
645 
646 		/* SISO */
647 		if (mcs <= IWL_RATE_SISO_60M_PLCP) {
648 			if (num_of_ant == 1)
649 				tbl->lq_type = LQ_SISO; /*else NONE*/
650 		/* MIMO2 */
651 		} else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
652 			if (num_of_ant == 2)
653 				tbl->lq_type = LQ_MIMO2;
654 		/* MIMO3 */
655 		} else {
656 			if (num_of_ant == 3) {
657 				tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
658 				tbl->lq_type = LQ_MIMO3;
659 			}
660 		}
661 	}
662 	return 0;
663 }
664 
665 /* switch to another antenna/antennas and return 1 */
666 /* if no other valid antenna found, return 0 */
rs_toggle_antenna(u32 valid_ant,u32 * rate_n_flags,struct iwl_scale_tbl_info * tbl)667 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
668 			     struct iwl_scale_tbl_info *tbl)
669 {
670 	u8 new_ant_type;
671 
672 	if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
673 		return 0;
674 
675 	if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
676 		return 0;
677 
678 	new_ant_type = ant_toggle_lookup[tbl->ant_type];
679 
680 	while ((new_ant_type != tbl->ant_type) &&
681 	       !rs_is_valid_ant(valid_ant, new_ant_type))
682 		new_ant_type = ant_toggle_lookup[new_ant_type];
683 
684 	if (new_ant_type == tbl->ant_type)
685 		return 0;
686 
687 	tbl->ant_type = new_ant_type;
688 	*rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
689 	*rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
690 	return 1;
691 }
692 
693 /**
694  * Green-field mode is valid if the station supports it and
695  * there are no non-GF stations present in the BSS.
696  */
rs_use_green(struct ieee80211_sta * sta)697 static bool rs_use_green(struct ieee80211_sta *sta)
698 {
699 	/*
700 	 * There's a bug somewhere in this code that causes the
701 	 * scaling to get stuck because GF+SGI can't be combined
702 	 * in SISO rates. Until we find that bug, disable GF, it
703 	 * has only limited benefit and we still interoperate with
704 	 * GF APs since we can always receive GF transmissions.
705 	 */
706 	return false;
707 }
708 
709 /**
710  * rs_get_supported_rates - get the available rates
711  *
712  * if management frame or broadcast frame only return
713  * basic available rates.
714  *
715  */
rs_get_supported_rates(struct iwl_lq_sta * lq_sta,struct ieee80211_hdr * hdr,enum iwl_table_type rate_type)716 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
717 				  struct ieee80211_hdr *hdr,
718 				  enum iwl_table_type rate_type)
719 {
720 	if (is_legacy(rate_type)) {
721 		return lq_sta->active_legacy_rate;
722 	} else {
723 		if (is_siso(rate_type))
724 			return lq_sta->active_siso_rate;
725 		else if (is_mimo2(rate_type))
726 			return lq_sta->active_mimo2_rate;
727 		else
728 			return lq_sta->active_mimo3_rate;
729 	}
730 }
731 
rs_get_adjacent_rate(struct iwl_priv * priv,u8 index,u16 rate_mask,int rate_type)732 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
733 				int rate_type)
734 {
735 	u8 high = IWL_RATE_INVALID;
736 	u8 low = IWL_RATE_INVALID;
737 
738 	/* 802.11A or ht walks to the next literal adjacent rate in
739 	 * the rate table */
740 	if (is_a_band(rate_type) || !is_legacy(rate_type)) {
741 		int i;
742 		u32 mask;
743 
744 		/* Find the previous rate that is in the rate mask */
745 		i = index - 1;
746 		for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
747 			if (rate_mask & mask) {
748 				low = i;
749 				break;
750 			}
751 		}
752 
753 		/* Find the next rate that is in the rate mask */
754 		i = index + 1;
755 		for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
756 			if (rate_mask & mask) {
757 				high = i;
758 				break;
759 			}
760 		}
761 
762 		return (high << 8) | low;
763 	}
764 
765 	low = index;
766 	while (low != IWL_RATE_INVALID) {
767 		low = iwl_rates[low].prev_rs;
768 		if (low == IWL_RATE_INVALID)
769 			break;
770 		if (rate_mask & (1 << low))
771 			break;
772 		IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
773 	}
774 
775 	high = index;
776 	while (high != IWL_RATE_INVALID) {
777 		high = iwl_rates[high].next_rs;
778 		if (high == IWL_RATE_INVALID)
779 			break;
780 		if (rate_mask & (1 << high))
781 			break;
782 		IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
783 	}
784 
785 	return (high << 8) | low;
786 }
787 
rs_get_lower_rate(struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,u8 scale_index,u8 ht_possible)788 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
789 			     struct iwl_scale_tbl_info *tbl,
790 			     u8 scale_index, u8 ht_possible)
791 {
792 	s32 low;
793 	u16 rate_mask;
794 	u16 high_low;
795 	u8 switch_to_legacy = 0;
796 	u8 is_green = lq_sta->is_green;
797 	struct iwl_priv *priv = lq_sta->drv;
798 
799 	/* check if we need to switch from HT to legacy rates.
800 	 * assumption is that mandatory rates (1Mbps or 6Mbps)
801 	 * are always supported (spec demand) */
802 	if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
803 		switch_to_legacy = 1;
804 		scale_index = rs_ht_to_legacy[scale_index];
805 		if (lq_sta->band == IEEE80211_BAND_5GHZ)
806 			tbl->lq_type = LQ_A;
807 		else
808 			tbl->lq_type = LQ_G;
809 
810 		if (num_of_ant(tbl->ant_type) > 1)
811 			tbl->ant_type =
812 			    first_antenna(priv->nvm_data->valid_tx_ant);
813 
814 		tbl->is_ht40 = 0;
815 		tbl->is_SGI = 0;
816 		tbl->max_search = IWL_MAX_SEARCH;
817 	}
818 
819 	rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
820 
821 	/* Mask with station rate restriction */
822 	if (is_legacy(tbl->lq_type)) {
823 		/* supp_rates has no CCK bits in A mode */
824 		if (lq_sta->band == IEEE80211_BAND_5GHZ)
825 			rate_mask  = (u16)(rate_mask &
826 			   (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
827 		else
828 			rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
829 	}
830 
831 	/* If we switched from HT to legacy, check current rate */
832 	if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
833 		low = scale_index;
834 		goto out;
835 	}
836 
837 	high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
838 					tbl->lq_type);
839 	low = high_low & 0xff;
840 
841 	if (low == IWL_RATE_INVALID)
842 		low = scale_index;
843 
844 out:
845 	return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
846 }
847 
848 /*
849  * Simple function to compare two rate scale table types
850  */
table_type_matches(struct iwl_scale_tbl_info * a,struct iwl_scale_tbl_info * b)851 static bool table_type_matches(struct iwl_scale_tbl_info *a,
852 			       struct iwl_scale_tbl_info *b)
853 {
854 	return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
855 		(a->is_SGI == b->is_SGI);
856 }
857 
rs_bt_update_lq(struct iwl_priv * priv,struct iwl_rxon_context * ctx,struct iwl_lq_sta * lq_sta)858 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
859 			    struct iwl_lq_sta *lq_sta)
860 {
861 	struct iwl_scale_tbl_info *tbl;
862 	bool full_concurrent = priv->bt_full_concurrent;
863 
864 	if (priv->bt_ant_couple_ok) {
865 		/*
866 		 * Is there a need to switch between
867 		 * full concurrency and 3-wire?
868 		 */
869 		if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
870 			full_concurrent = true;
871 		else
872 			full_concurrent = false;
873 	}
874 	if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
875 	    (priv->bt_full_concurrent != full_concurrent)) {
876 		priv->bt_full_concurrent = full_concurrent;
877 		priv->last_bt_traffic_load = priv->bt_traffic_load;
878 
879 		/* Update uCode's rate table. */
880 		tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
881 		rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
882 		iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
883 
884 		queue_work(priv->workqueue, &priv->bt_full_concurrency);
885 	}
886 }
887 
888 /*
889  * mac80211 sends us Tx status
890  */
rs_tx_status(void * priv_r,struct ieee80211_supported_band * sband,struct ieee80211_sta * sta,void * priv_sta,struct sk_buff * skb)891 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
892 			 struct ieee80211_sta *sta, void *priv_sta,
893 			 struct sk_buff *skb)
894 {
895 	int legacy_success;
896 	int retries;
897 	int rs_index, mac_index, i;
898 	struct iwl_lq_sta *lq_sta = priv_sta;
899 	struct iwl_link_quality_cmd *table;
900 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
901 	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)priv_r;
902 	struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
903 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
904 	enum mac80211_rate_control_flags mac_flags;
905 	u32 tx_rate;
906 	struct iwl_scale_tbl_info tbl_type;
907 	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
908 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
909 	struct iwl_rxon_context *ctx = sta_priv->ctx;
910 
911 	IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
912 
913 	/* Treat uninitialized rate scaling data same as non-existing. */
914 	if (!lq_sta) {
915 		IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
916 		return;
917 	} else if (!lq_sta->drv) {
918 		IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
919 		return;
920 	}
921 
922 	if (!ieee80211_is_data(hdr->frame_control) ||
923 	    info->flags & IEEE80211_TX_CTL_NO_ACK)
924 		return;
925 
926 	/* This packet was aggregated but doesn't carry status info */
927 	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
928 	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
929 		return;
930 
931 	/*
932 	 * Ignore this Tx frame response if its initial rate doesn't match
933 	 * that of latest Link Quality command.  There may be stragglers
934 	 * from a previous Link Quality command, but we're no longer interested
935 	 * in those; they're either from the "active" mode while we're trying
936 	 * to check "search" mode, or a prior "search" mode after we've moved
937 	 * to a new "search" mode (which might become the new "active" mode).
938 	 */
939 	table = &lq_sta->lq;
940 	tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
941 	rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
942 	if (priv->band == IEEE80211_BAND_5GHZ)
943 		rs_index -= IWL_FIRST_OFDM_RATE;
944 	mac_flags = info->status.rates[0].flags;
945 	mac_index = info->status.rates[0].idx;
946 	/* For HT packets, map MCS to PLCP */
947 	if (mac_flags & IEEE80211_TX_RC_MCS) {
948 		mac_index &= RATE_MCS_CODE_MSK;	/* Remove # of streams */
949 		if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
950 			mac_index++;
951 		/*
952 		 * mac80211 HT index is always zero-indexed; we need to move
953 		 * HT OFDM rates after CCK rates in 2.4 GHz band
954 		 */
955 		if (priv->band == IEEE80211_BAND_2GHZ)
956 			mac_index += IWL_FIRST_OFDM_RATE;
957 	}
958 	/* Here we actually compare this rate to the latest LQ command */
959 	if ((mac_index < 0) ||
960 	    (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
961 	    (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
962 	    (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
963 	    (tbl_type.ant_type != info->status.antenna) ||
964 	    (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
965 	    (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
966 	    (rs_index != mac_index)) {
967 		IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
968 		/*
969 		 * Since rates mis-match, the last LQ command may have failed.
970 		 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
971 		 * ... driver.
972 		 */
973 		lq_sta->missed_rate_counter++;
974 		if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
975 			lq_sta->missed_rate_counter = 0;
976 			iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
977 		}
978 		/* Regardless, ignore this status info for outdated rate */
979 		return;
980 	} else
981 		/* Rate did match, so reset the missed_rate_counter */
982 		lq_sta->missed_rate_counter = 0;
983 
984 	/* Figure out if rate scale algorithm is in active or search table */
985 	if (table_type_matches(&tbl_type,
986 				&(lq_sta->lq_info[lq_sta->active_tbl]))) {
987 		curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
988 		other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
989 	} else if (table_type_matches(&tbl_type,
990 				&lq_sta->lq_info[1 - lq_sta->active_tbl])) {
991 		curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
992 		other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
993 	} else {
994 		IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
995 		tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
996 		IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
997 			tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
998 		tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
999 		IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1000 			tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1001 		IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1002 			tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1003 		/*
1004 		 * no matching table found, let's by-pass the data collection
1005 		 * and continue to perform rate scale to find the rate table
1006 		 */
1007 		rs_stay_in_table(lq_sta, true);
1008 		goto done;
1009 	}
1010 
1011 	/*
1012 	 * Updating the frame history depends on whether packets were
1013 	 * aggregated.
1014 	 *
1015 	 * For aggregation, all packets were transmitted at the same rate, the
1016 	 * first index into rate scale table.
1017 	 */
1018 	if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1019 		tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1020 		rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1021 				&rs_index);
1022 		rs_collect_tx_data(curr_tbl, rs_index,
1023 				   info->status.ampdu_len,
1024 				   info->status.ampdu_ack_len);
1025 
1026 		/* Update success/fail counts if not searching for new mode */
1027 		if (lq_sta->stay_in_tbl) {
1028 			lq_sta->total_success += info->status.ampdu_ack_len;
1029 			lq_sta->total_failed += (info->status.ampdu_len -
1030 					info->status.ampdu_ack_len);
1031 		}
1032 	} else {
1033 	/*
1034 	 * For legacy, update frame history with for each Tx retry.
1035 	 */
1036 		retries = info->status.rates[0].count - 1;
1037 		/* HW doesn't send more than 15 retries */
1038 		retries = min(retries, 15);
1039 
1040 		/* The last transmission may have been successful */
1041 		legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1042 		/* Collect data for each rate used during failed TX attempts */
1043 		for (i = 0; i <= retries; ++i) {
1044 			tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1045 			rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1046 					&tbl_type, &rs_index);
1047 			/*
1048 			 * Only collect stats if retried rate is in the same RS
1049 			 * table as active/search.
1050 			 */
1051 			if (table_type_matches(&tbl_type, curr_tbl))
1052 				tmp_tbl = curr_tbl;
1053 			else if (table_type_matches(&tbl_type, other_tbl))
1054 				tmp_tbl = other_tbl;
1055 			else
1056 				continue;
1057 			rs_collect_tx_data(tmp_tbl, rs_index, 1,
1058 					   i < retries ? 0 : legacy_success);
1059 		}
1060 
1061 		/* Update success/fail counts if not searching for new mode */
1062 		if (lq_sta->stay_in_tbl) {
1063 			lq_sta->total_success += legacy_success;
1064 			lq_sta->total_failed += retries + (1 - legacy_success);
1065 		}
1066 	}
1067 	/* The last TX rate is cached in lq_sta; it's set in if/else above */
1068 	lq_sta->last_rate_n_flags = tx_rate;
1069 done:
1070 	/* See if there's a better rate or modulation mode to try. */
1071 	if (sta && sta->supp_rates[sband->band])
1072 		rs_rate_scale_perform(priv, skb, sta, lq_sta);
1073 
1074 	if (priv->lib->bt_params && priv->lib->bt_params->advanced_bt_coexist)
1075 		rs_bt_update_lq(priv, ctx, lq_sta);
1076 }
1077 
1078 /*
1079  * Begin a period of staying with a selected modulation mode.
1080  * Set "stay_in_tbl" flag to prevent any mode switches.
1081  * Set frame tx success limits according to legacy vs. high-throughput,
1082  * and reset overall (spanning all rates) tx success history statistics.
1083  * These control how long we stay using same modulation mode before
1084  * searching for a new mode.
1085  */
rs_set_stay_in_table(struct iwl_priv * priv,u8 is_legacy,struct iwl_lq_sta * lq_sta)1086 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1087 				 struct iwl_lq_sta *lq_sta)
1088 {
1089 	IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1090 	lq_sta->stay_in_tbl = 1;	/* only place this gets set */
1091 	if (is_legacy) {
1092 		lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1093 		lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1094 		lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1095 	} else {
1096 		lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1097 		lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1098 		lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1099 	}
1100 	lq_sta->table_count = 0;
1101 	lq_sta->total_failed = 0;
1102 	lq_sta->total_success = 0;
1103 	lq_sta->flush_timer = jiffies;
1104 	lq_sta->action_counter = 0;
1105 }
1106 
1107 /*
1108  * Find correct throughput table for given mode of modulation
1109  */
rs_set_expected_tpt_table(struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)1110 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1111 				      struct iwl_scale_tbl_info *tbl)
1112 {
1113 	/* Used to choose among HT tables */
1114 	const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1115 
1116 	/* Check for invalid LQ type */
1117 	if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1118 		tbl->expected_tpt = expected_tpt_legacy;
1119 		return;
1120 	}
1121 
1122 	/* Legacy rates have only one table */
1123 	if (is_legacy(tbl->lq_type)) {
1124 		tbl->expected_tpt = expected_tpt_legacy;
1125 		return;
1126 	}
1127 
1128 	/* Choose among many HT tables depending on number of streams
1129 	 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1130 	 * status */
1131 	if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1132 		ht_tbl_pointer = expected_tpt_siso20MHz;
1133 	else if (is_siso(tbl->lq_type))
1134 		ht_tbl_pointer = expected_tpt_siso40MHz;
1135 	else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1136 		ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1137 	else if (is_mimo2(tbl->lq_type))
1138 		ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1139 	else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1140 		ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1141 	else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1142 		ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1143 
1144 	if (!tbl->is_SGI && !lq_sta->is_agg)		/* Normal */
1145 		tbl->expected_tpt = ht_tbl_pointer[0];
1146 	else if (tbl->is_SGI && !lq_sta->is_agg)	/* SGI */
1147 		tbl->expected_tpt = ht_tbl_pointer[1];
1148 	else if (!tbl->is_SGI && lq_sta->is_agg)	/* AGG */
1149 		tbl->expected_tpt = ht_tbl_pointer[2];
1150 	else						/* AGG+SGI */
1151 		tbl->expected_tpt = ht_tbl_pointer[3];
1152 }
1153 
1154 /*
1155  * Find starting rate for new "search" high-throughput mode of modulation.
1156  * Goal is to find lowest expected rate (under perfect conditions) that is
1157  * above the current measured throughput of "active" mode, to give new mode
1158  * a fair chance to prove itself without too many challenges.
1159  *
1160  * This gets called when transitioning to more aggressive modulation
1161  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1162  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1163  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1164  * bit rate will typically need to increase, but not if performance was bad.
1165  */
rs_get_best_rate(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,u16 rate_mask,s8 index)1166 static s32 rs_get_best_rate(struct iwl_priv *priv,
1167 			    struct iwl_lq_sta *lq_sta,
1168 			    struct iwl_scale_tbl_info *tbl,	/* "search" */
1169 			    u16 rate_mask, s8 index)
1170 {
1171 	/* "active" values */
1172 	struct iwl_scale_tbl_info *active_tbl =
1173 	    &(lq_sta->lq_info[lq_sta->active_tbl]);
1174 	s32 active_sr = active_tbl->win[index].success_ratio;
1175 	s32 active_tpt = active_tbl->expected_tpt[index];
1176 	/* expected "search" throughput */
1177 	const u16 *tpt_tbl = tbl->expected_tpt;
1178 
1179 	s32 new_rate, high, low, start_hi;
1180 	u16 high_low;
1181 	s8 rate = index;
1182 
1183 	new_rate = high = low = start_hi = IWL_RATE_INVALID;
1184 
1185 	for (; ;) {
1186 		high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1187 						tbl->lq_type);
1188 
1189 		low = high_low & 0xff;
1190 		high = (high_low >> 8) & 0xff;
1191 
1192 		/*
1193 		 * Lower the "search" bit rate, to give new "search" mode
1194 		 * approximately the same throughput as "active" if:
1195 		 *
1196 		 * 1) "Active" mode has been working modestly well (but not
1197 		 *    great), and expected "search" throughput (under perfect
1198 		 *    conditions) at candidate rate is above the actual
1199 		 *    measured "active" throughput (but less than expected
1200 		 *    "active" throughput under perfect conditions).
1201 		 * OR
1202 		 * 2) "Active" mode has been working perfectly or very well
1203 		 *    and expected "search" throughput (under perfect
1204 		 *    conditions) at candidate rate is above expected
1205 		 *    "active" throughput (under perfect conditions).
1206 		 */
1207 		if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1208 		     ((active_sr > IWL_RATE_DECREASE_TH) &&
1209 		      (active_sr <= IWL_RATE_HIGH_TH) &&
1210 		      (tpt_tbl[rate] <= active_tpt))) ||
1211 		    ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1212 		     (tpt_tbl[rate] > active_tpt))) {
1213 
1214 			/* (2nd or later pass)
1215 			 * If we've already tried to raise the rate, and are
1216 			 * now trying to lower it, use the higher rate. */
1217 			if (start_hi != IWL_RATE_INVALID) {
1218 				new_rate = start_hi;
1219 				break;
1220 			}
1221 
1222 			new_rate = rate;
1223 
1224 			/* Loop again with lower rate */
1225 			if (low != IWL_RATE_INVALID)
1226 				rate = low;
1227 
1228 			/* Lower rate not available, use the original */
1229 			else
1230 				break;
1231 
1232 		/* Else try to raise the "search" rate to match "active" */
1233 		} else {
1234 			/* (2nd or later pass)
1235 			 * If we've already tried to lower the rate, and are
1236 			 * now trying to raise it, use the lower rate. */
1237 			if (new_rate != IWL_RATE_INVALID)
1238 				break;
1239 
1240 			/* Loop again with higher rate */
1241 			else if (high != IWL_RATE_INVALID) {
1242 				start_hi = high;
1243 				rate = high;
1244 
1245 			/* Higher rate not available, use the original */
1246 			} else {
1247 				new_rate = rate;
1248 				break;
1249 			}
1250 		}
1251 	}
1252 
1253 	return new_rate;
1254 }
1255 
1256 /*
1257  * Set up search table for MIMO2
1258  */
rs_switch_to_mimo2(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl,int index)1259 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1260 			     struct iwl_lq_sta *lq_sta,
1261 			     struct ieee80211_conf *conf,
1262 			     struct ieee80211_sta *sta,
1263 			     struct iwl_scale_tbl_info *tbl, int index)
1264 {
1265 	u16 rate_mask;
1266 	s32 rate;
1267 	s8 is_green = lq_sta->is_green;
1268 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1269 	struct iwl_rxon_context *ctx = sta_priv->ctx;
1270 
1271 	if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1272 		return -1;
1273 
1274 	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1275 		return -1;
1276 
1277 	/* Need both Tx chains/antennas to support MIMO */
1278 	if (priv->hw_params.tx_chains_num < 2)
1279 		return -1;
1280 
1281 	IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1282 
1283 	tbl->lq_type = LQ_MIMO2;
1284 	tbl->is_dup = lq_sta->is_dup;
1285 	tbl->action = 0;
1286 	tbl->max_search = IWL_MAX_SEARCH;
1287 	rate_mask = lq_sta->active_mimo2_rate;
1288 
1289 	if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1290 		tbl->is_ht40 = 1;
1291 	else
1292 		tbl->is_ht40 = 0;
1293 
1294 	rs_set_expected_tpt_table(lq_sta, tbl);
1295 
1296 	rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1297 
1298 	IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1299 	if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1300 		IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1301 						rate, rate_mask);
1302 		return -1;
1303 	}
1304 	tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1305 
1306 	IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1307 		     tbl->current_rate, is_green);
1308 	return 0;
1309 }
1310 
1311 /*
1312  * Set up search table for MIMO3
1313  */
rs_switch_to_mimo3(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl,int index)1314 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1315 			     struct iwl_lq_sta *lq_sta,
1316 			     struct ieee80211_conf *conf,
1317 			     struct ieee80211_sta *sta,
1318 			     struct iwl_scale_tbl_info *tbl, int index)
1319 {
1320 	u16 rate_mask;
1321 	s32 rate;
1322 	s8 is_green = lq_sta->is_green;
1323 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1324 	struct iwl_rxon_context *ctx = sta_priv->ctx;
1325 
1326 	if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1327 		return -1;
1328 
1329 	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1330 		return -1;
1331 
1332 	/* Need both Tx chains/antennas to support MIMO */
1333 	if (priv->hw_params.tx_chains_num < 3)
1334 		return -1;
1335 
1336 	IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1337 
1338 	tbl->lq_type = LQ_MIMO3;
1339 	tbl->is_dup = lq_sta->is_dup;
1340 	tbl->action = 0;
1341 	tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1342 	rate_mask = lq_sta->active_mimo3_rate;
1343 
1344 	if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1345 		tbl->is_ht40 = 1;
1346 	else
1347 		tbl->is_ht40 = 0;
1348 
1349 	rs_set_expected_tpt_table(lq_sta, tbl);
1350 
1351 	rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1352 
1353 	IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1354 		rate, rate_mask);
1355 	if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1356 		IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1357 						rate, rate_mask);
1358 		return -1;
1359 	}
1360 	tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1361 
1362 	IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1363 		     tbl->current_rate, is_green);
1364 	return 0;
1365 }
1366 
1367 /*
1368  * Set up search table for SISO
1369  */
rs_switch_to_siso(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl,int index)1370 static int rs_switch_to_siso(struct iwl_priv *priv,
1371 			     struct iwl_lq_sta *lq_sta,
1372 			     struct ieee80211_conf *conf,
1373 			     struct ieee80211_sta *sta,
1374 			     struct iwl_scale_tbl_info *tbl, int index)
1375 {
1376 	u16 rate_mask;
1377 	u8 is_green = lq_sta->is_green;
1378 	s32 rate;
1379 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1380 	struct iwl_rxon_context *ctx = sta_priv->ctx;
1381 
1382 	if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1383 		return -1;
1384 
1385 	IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1386 
1387 	tbl->is_dup = lq_sta->is_dup;
1388 	tbl->lq_type = LQ_SISO;
1389 	tbl->action = 0;
1390 	tbl->max_search = IWL_MAX_SEARCH;
1391 	rate_mask = lq_sta->active_siso_rate;
1392 
1393 	if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
1394 		tbl->is_ht40 = 1;
1395 	else
1396 		tbl->is_ht40 = 0;
1397 
1398 	if (is_green)
1399 		tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1400 
1401 	rs_set_expected_tpt_table(lq_sta, tbl);
1402 	rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1403 
1404 	IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1405 	if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1406 		IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1407 			     rate, rate_mask);
1408 		return -1;
1409 	}
1410 	tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1411 	IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1412 		     tbl->current_rate, is_green);
1413 	return 0;
1414 }
1415 
1416 /*
1417  * Try to switch to new modulation mode from legacy
1418  */
rs_move_legacy_other(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,int index)1419 static int rs_move_legacy_other(struct iwl_priv *priv,
1420 				struct iwl_lq_sta *lq_sta,
1421 				struct ieee80211_conf *conf,
1422 				struct ieee80211_sta *sta,
1423 				int index)
1424 {
1425 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1426 	struct iwl_scale_tbl_info *search_tbl =
1427 				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1428 	struct iwl_rate_scale_data *window = &(tbl->win[index]);
1429 	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1430 		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1431 	u8 start_action;
1432 	u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1433 	u8 tx_chains_num = priv->hw_params.tx_chains_num;
1434 	int ret = 0;
1435 	u8 update_search_tbl_counter = 0;
1436 
1437 	switch (priv->bt_traffic_load) {
1438 	case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1439 		/* nothing */
1440 		break;
1441 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1442 		/* avoid antenna B unless MIMO */
1443 		if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1444 			tbl->action = IWL_LEGACY_SWITCH_SISO;
1445 		break;
1446 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1447 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1448 		/* avoid antenna B and MIMO */
1449 		valid_tx_ant =
1450 			first_antenna(priv->nvm_data->valid_tx_ant);
1451 		if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1452 		    tbl->action != IWL_LEGACY_SWITCH_SISO)
1453 			tbl->action = IWL_LEGACY_SWITCH_SISO;
1454 		break;
1455 	default:
1456 		IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1457 		break;
1458 	}
1459 
1460 	if (!iwl_ht_enabled(priv))
1461 		/* stay in Legacy */
1462 		tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1463 	else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1464 		   tbl->action > IWL_LEGACY_SWITCH_SISO)
1465 		tbl->action = IWL_LEGACY_SWITCH_SISO;
1466 
1467 	/* configure as 1x1 if bt full concurrency */
1468 	if (priv->bt_full_concurrent) {
1469 		if (!iwl_ht_enabled(priv))
1470 			tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1471 		else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1472 			tbl->action = IWL_LEGACY_SWITCH_SISO;
1473 		valid_tx_ant =
1474 			first_antenna(priv->nvm_data->valid_tx_ant);
1475 	}
1476 
1477 	start_action = tbl->action;
1478 	for (; ;) {
1479 		lq_sta->action_counter++;
1480 		switch (tbl->action) {
1481 		case IWL_LEGACY_SWITCH_ANTENNA1:
1482 		case IWL_LEGACY_SWITCH_ANTENNA2:
1483 			IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1484 
1485 			if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1486 							tx_chains_num <= 1) ||
1487 			    (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1488 							tx_chains_num <= 2))
1489 				break;
1490 
1491 			/* Don't change antenna if success has been great */
1492 			if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1493 			    !priv->bt_full_concurrent &&
1494 			    priv->bt_traffic_load ==
1495 					IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1496 				break;
1497 
1498 			/* Set up search table to try other antenna */
1499 			memcpy(search_tbl, tbl, sz);
1500 
1501 			if (rs_toggle_antenna(valid_tx_ant,
1502 				&search_tbl->current_rate, search_tbl)) {
1503 				update_search_tbl_counter = 1;
1504 				rs_set_expected_tpt_table(lq_sta, search_tbl);
1505 				goto out;
1506 			}
1507 			break;
1508 		case IWL_LEGACY_SWITCH_SISO:
1509 			IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1510 
1511 			/* Set up search table to try SISO */
1512 			memcpy(search_tbl, tbl, sz);
1513 			search_tbl->is_SGI = 0;
1514 			ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1515 						 search_tbl, index);
1516 			if (!ret) {
1517 				lq_sta->action_counter = 0;
1518 				goto out;
1519 			}
1520 
1521 			break;
1522 		case IWL_LEGACY_SWITCH_MIMO2_AB:
1523 		case IWL_LEGACY_SWITCH_MIMO2_AC:
1524 		case IWL_LEGACY_SWITCH_MIMO2_BC:
1525 			IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1526 
1527 			/* Set up search table to try MIMO */
1528 			memcpy(search_tbl, tbl, sz);
1529 			search_tbl->is_SGI = 0;
1530 
1531 			if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1532 				search_tbl->ant_type = ANT_AB;
1533 			else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1534 				search_tbl->ant_type = ANT_AC;
1535 			else
1536 				search_tbl->ant_type = ANT_BC;
1537 
1538 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1539 				break;
1540 
1541 			ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1542 						 search_tbl, index);
1543 			if (!ret) {
1544 				lq_sta->action_counter = 0;
1545 				goto out;
1546 			}
1547 			break;
1548 
1549 		case IWL_LEGACY_SWITCH_MIMO3_ABC:
1550 			IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1551 
1552 			/* Set up search table to try MIMO3 */
1553 			memcpy(search_tbl, tbl, sz);
1554 			search_tbl->is_SGI = 0;
1555 
1556 			search_tbl->ant_type = ANT_ABC;
1557 
1558 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1559 				break;
1560 
1561 			ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1562 						 search_tbl, index);
1563 			if (!ret) {
1564 				lq_sta->action_counter = 0;
1565 				goto out;
1566 			}
1567 			break;
1568 		}
1569 		tbl->action++;
1570 		if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1571 			tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1572 
1573 		if (tbl->action == start_action)
1574 			break;
1575 
1576 	}
1577 	search_tbl->lq_type = LQ_NONE;
1578 	return 0;
1579 
1580 out:
1581 	lq_sta->search_better_tbl = 1;
1582 	tbl->action++;
1583 	if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1584 		tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1585 	if (update_search_tbl_counter)
1586 		search_tbl->action = tbl->action;
1587 	return 0;
1588 
1589 }
1590 
1591 /*
1592  * Try to switch to new modulation mode from SISO
1593  */
rs_move_siso_to_other(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,int index)1594 static int rs_move_siso_to_other(struct iwl_priv *priv,
1595 				 struct iwl_lq_sta *lq_sta,
1596 				 struct ieee80211_conf *conf,
1597 				 struct ieee80211_sta *sta, int index)
1598 {
1599 	u8 is_green = lq_sta->is_green;
1600 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1601 	struct iwl_scale_tbl_info *search_tbl =
1602 				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1603 	struct iwl_rate_scale_data *window = &(tbl->win[index]);
1604 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1605 	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1606 		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1607 	u8 start_action;
1608 	u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1609 	u8 tx_chains_num = priv->hw_params.tx_chains_num;
1610 	u8 update_search_tbl_counter = 0;
1611 	int ret;
1612 
1613 	switch (priv->bt_traffic_load) {
1614 	case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1615 		/* nothing */
1616 		break;
1617 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1618 		/* avoid antenna B unless MIMO */
1619 		if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1620 			tbl->action = IWL_SISO_SWITCH_MIMO2_AB;
1621 		break;
1622 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1623 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1624 		/* avoid antenna B and MIMO */
1625 		valid_tx_ant =
1626 			first_antenna(priv->nvm_data->valid_tx_ant);
1627 		if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1628 			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1629 		break;
1630 	default:
1631 		IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1632 		break;
1633 	}
1634 
1635 	if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1636 	    tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1637 		/* stay in SISO */
1638 		tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1639 	}
1640 
1641 	/* configure as 1x1 if bt full concurrency */
1642 	if (priv->bt_full_concurrent) {
1643 		valid_tx_ant =
1644 			first_antenna(priv->nvm_data->valid_tx_ant);
1645 		if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1646 			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1647 	}
1648 
1649 	start_action = tbl->action;
1650 	for (;;) {
1651 		lq_sta->action_counter++;
1652 		switch (tbl->action) {
1653 		case IWL_SISO_SWITCH_ANTENNA1:
1654 		case IWL_SISO_SWITCH_ANTENNA2:
1655 			IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1656 			if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1657 						tx_chains_num <= 1) ||
1658 			    (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1659 						tx_chains_num <= 2))
1660 				break;
1661 
1662 			if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1663 			    !priv->bt_full_concurrent &&
1664 			    priv->bt_traffic_load ==
1665 					IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1666 				break;
1667 
1668 			memcpy(search_tbl, tbl, sz);
1669 			if (rs_toggle_antenna(valid_tx_ant,
1670 				       &search_tbl->current_rate, search_tbl)) {
1671 				update_search_tbl_counter = 1;
1672 				goto out;
1673 			}
1674 			break;
1675 		case IWL_SISO_SWITCH_MIMO2_AB:
1676 		case IWL_SISO_SWITCH_MIMO2_AC:
1677 		case IWL_SISO_SWITCH_MIMO2_BC:
1678 			IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1679 			memcpy(search_tbl, tbl, sz);
1680 			search_tbl->is_SGI = 0;
1681 
1682 			if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1683 				search_tbl->ant_type = ANT_AB;
1684 			else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1685 				search_tbl->ant_type = ANT_AC;
1686 			else
1687 				search_tbl->ant_type = ANT_BC;
1688 
1689 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1690 				break;
1691 
1692 			ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1693 						 search_tbl, index);
1694 			if (!ret)
1695 				goto out;
1696 			break;
1697 		case IWL_SISO_SWITCH_GI:
1698 			if (!tbl->is_ht40 && !(ht_cap->cap &
1699 						IEEE80211_HT_CAP_SGI_20))
1700 				break;
1701 			if (tbl->is_ht40 && !(ht_cap->cap &
1702 						IEEE80211_HT_CAP_SGI_40))
1703 				break;
1704 
1705 			IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1706 
1707 			memcpy(search_tbl, tbl, sz);
1708 			if (is_green) {
1709 				if (!tbl->is_SGI)
1710 					break;
1711 				else
1712 					IWL_ERR(priv,
1713 						"SGI was set in GF+SISO\n");
1714 			}
1715 			search_tbl->is_SGI = !tbl->is_SGI;
1716 			rs_set_expected_tpt_table(lq_sta, search_tbl);
1717 			if (tbl->is_SGI) {
1718 				s32 tpt = lq_sta->last_tpt / 100;
1719 				if (tpt >= search_tbl->expected_tpt[index])
1720 					break;
1721 			}
1722 			search_tbl->current_rate =
1723 				rate_n_flags_from_tbl(priv, search_tbl,
1724 						      index, is_green);
1725 			update_search_tbl_counter = 1;
1726 			goto out;
1727 		case IWL_SISO_SWITCH_MIMO3_ABC:
1728 			IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1729 			memcpy(search_tbl, tbl, sz);
1730 			search_tbl->is_SGI = 0;
1731 			search_tbl->ant_type = ANT_ABC;
1732 
1733 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1734 				break;
1735 
1736 			ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1737 						 search_tbl, index);
1738 			if (!ret)
1739 				goto out;
1740 			break;
1741 		}
1742 		tbl->action++;
1743 		if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1744 			tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1745 
1746 		if (tbl->action == start_action)
1747 			break;
1748 	}
1749 	search_tbl->lq_type = LQ_NONE;
1750 	return 0;
1751 
1752  out:
1753 	lq_sta->search_better_tbl = 1;
1754 	tbl->action++;
1755 	if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1756 		tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1757 	if (update_search_tbl_counter)
1758 		search_tbl->action = tbl->action;
1759 
1760 	return 0;
1761 }
1762 
1763 /*
1764  * Try to switch to new modulation mode from MIMO2
1765  */
rs_move_mimo2_to_other(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,int index)1766 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1767 				 struct iwl_lq_sta *lq_sta,
1768 				 struct ieee80211_conf *conf,
1769 				 struct ieee80211_sta *sta, int index)
1770 {
1771 	s8 is_green = lq_sta->is_green;
1772 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1773 	struct iwl_scale_tbl_info *search_tbl =
1774 				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1775 	struct iwl_rate_scale_data *window = &(tbl->win[index]);
1776 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1777 	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1778 		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1779 	u8 start_action;
1780 	u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1781 	u8 tx_chains_num = priv->hw_params.tx_chains_num;
1782 	u8 update_search_tbl_counter = 0;
1783 	int ret;
1784 
1785 	switch (priv->bt_traffic_load) {
1786 	case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1787 		/* nothing */
1788 		break;
1789 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1790 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1791 		/* avoid antenna B and MIMO */
1792 		if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1793 			tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1794 		break;
1795 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1796 		/* avoid antenna B unless MIMO */
1797 		if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1798 		    tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1799 			tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1800 		break;
1801 	default:
1802 		IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1803 		break;
1804 	}
1805 
1806 	if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1807 	    (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1808 	     tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1809 		/* switch in SISO */
1810 		tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1811 	}
1812 
1813 	/* configure as 1x1 if bt full concurrency */
1814 	if (priv->bt_full_concurrent &&
1815 	    (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1816 	     tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1817 		tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1818 
1819 	start_action = tbl->action;
1820 	for (;;) {
1821 		lq_sta->action_counter++;
1822 		switch (tbl->action) {
1823 		case IWL_MIMO2_SWITCH_ANTENNA1:
1824 		case IWL_MIMO2_SWITCH_ANTENNA2:
1825 			IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1826 
1827 			if (tx_chains_num <= 2)
1828 				break;
1829 
1830 			if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1831 				break;
1832 
1833 			memcpy(search_tbl, tbl, sz);
1834 			if (rs_toggle_antenna(valid_tx_ant,
1835 				       &search_tbl->current_rate, search_tbl)) {
1836 				update_search_tbl_counter = 1;
1837 				goto out;
1838 			}
1839 			break;
1840 		case IWL_MIMO2_SWITCH_SISO_A:
1841 		case IWL_MIMO2_SWITCH_SISO_B:
1842 		case IWL_MIMO2_SWITCH_SISO_C:
1843 			IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1844 
1845 			/* Set up new search table for SISO */
1846 			memcpy(search_tbl, tbl, sz);
1847 
1848 			if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1849 				search_tbl->ant_type = ANT_A;
1850 			else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1851 				search_tbl->ant_type = ANT_B;
1852 			else
1853 				search_tbl->ant_type = ANT_C;
1854 
1855 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1856 				break;
1857 
1858 			ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1859 						 search_tbl, index);
1860 			if (!ret)
1861 				goto out;
1862 
1863 			break;
1864 
1865 		case IWL_MIMO2_SWITCH_GI:
1866 			if (!tbl->is_ht40 && !(ht_cap->cap &
1867 						IEEE80211_HT_CAP_SGI_20))
1868 				break;
1869 			if (tbl->is_ht40 && !(ht_cap->cap &
1870 						IEEE80211_HT_CAP_SGI_40))
1871 				break;
1872 
1873 			IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1874 
1875 			/* Set up new search table for MIMO2 */
1876 			memcpy(search_tbl, tbl, sz);
1877 			search_tbl->is_SGI = !tbl->is_SGI;
1878 			rs_set_expected_tpt_table(lq_sta, search_tbl);
1879 			/*
1880 			 * If active table already uses the fastest possible
1881 			 * modulation (dual stream with short guard interval),
1882 			 * and it's working well, there's no need to look
1883 			 * for a better type of modulation!
1884 			 */
1885 			if (tbl->is_SGI) {
1886 				s32 tpt = lq_sta->last_tpt / 100;
1887 				if (tpt >= search_tbl->expected_tpt[index])
1888 					break;
1889 			}
1890 			search_tbl->current_rate =
1891 				rate_n_flags_from_tbl(priv, search_tbl,
1892 						      index, is_green);
1893 			update_search_tbl_counter = 1;
1894 			goto out;
1895 
1896 		case IWL_MIMO2_SWITCH_MIMO3_ABC:
1897 			IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1898 			memcpy(search_tbl, tbl, sz);
1899 			search_tbl->is_SGI = 0;
1900 			search_tbl->ant_type = ANT_ABC;
1901 
1902 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1903 				break;
1904 
1905 			ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1906 						 search_tbl, index);
1907 			if (!ret)
1908 				goto out;
1909 
1910 			break;
1911 		}
1912 		tbl->action++;
1913 		if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1914 			tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1915 
1916 		if (tbl->action == start_action)
1917 			break;
1918 	}
1919 	search_tbl->lq_type = LQ_NONE;
1920 	return 0;
1921  out:
1922 	lq_sta->search_better_tbl = 1;
1923 	tbl->action++;
1924 	if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1925 		tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1926 	if (update_search_tbl_counter)
1927 		search_tbl->action = tbl->action;
1928 
1929 	return 0;
1930 
1931 }
1932 
1933 /*
1934  * Try to switch to new modulation mode from MIMO3
1935  */
rs_move_mimo3_to_other(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,struct ieee80211_conf * conf,struct ieee80211_sta * sta,int index)1936 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1937 				 struct iwl_lq_sta *lq_sta,
1938 				 struct ieee80211_conf *conf,
1939 				 struct ieee80211_sta *sta, int index)
1940 {
1941 	s8 is_green = lq_sta->is_green;
1942 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1943 	struct iwl_scale_tbl_info *search_tbl =
1944 				&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1945 	struct iwl_rate_scale_data *window = &(tbl->win[index]);
1946 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1947 	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1948 		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1949 	u8 start_action;
1950 	u8 valid_tx_ant = priv->nvm_data->valid_tx_ant;
1951 	u8 tx_chains_num = priv->hw_params.tx_chains_num;
1952 	int ret;
1953 	u8 update_search_tbl_counter = 0;
1954 
1955 	switch (priv->bt_traffic_load) {
1956 	case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1957 		/* nothing */
1958 		break;
1959 	case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1960 	case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1961 		/* avoid antenna B and MIMO */
1962 		if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1963 			tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1964 		break;
1965 	case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1966 		/* avoid antenna B unless MIMO */
1967 		if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1968 		    tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1969 			tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1970 		break;
1971 	default:
1972 		IWL_ERR(priv, "Invalid BT load %d\n", priv->bt_traffic_load);
1973 		break;
1974 	}
1975 
1976 	if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1977 	    (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1978 	     tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1979 		/* switch in SISO */
1980 		tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1981 	}
1982 
1983 	/* configure as 1x1 if bt full concurrency */
1984 	if (priv->bt_full_concurrent &&
1985 	    (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1986 	     tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1987 		tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1988 
1989 	start_action = tbl->action;
1990 	for (;;) {
1991 		lq_sta->action_counter++;
1992 		switch (tbl->action) {
1993 		case IWL_MIMO3_SWITCH_ANTENNA1:
1994 		case IWL_MIMO3_SWITCH_ANTENNA2:
1995 			IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1996 
1997 			if (tx_chains_num <= 3)
1998 				break;
1999 
2000 			if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2001 				break;
2002 
2003 			memcpy(search_tbl, tbl, sz);
2004 			if (rs_toggle_antenna(valid_tx_ant,
2005 				       &search_tbl->current_rate, search_tbl))
2006 				goto out;
2007 			break;
2008 		case IWL_MIMO3_SWITCH_SISO_A:
2009 		case IWL_MIMO3_SWITCH_SISO_B:
2010 		case IWL_MIMO3_SWITCH_SISO_C:
2011 			IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2012 
2013 			/* Set up new search table for SISO */
2014 			memcpy(search_tbl, tbl, sz);
2015 
2016 			if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2017 				search_tbl->ant_type = ANT_A;
2018 			else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2019 				search_tbl->ant_type = ANT_B;
2020 			else
2021 				search_tbl->ant_type = ANT_C;
2022 
2023 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2024 				break;
2025 
2026 			ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2027 						 search_tbl, index);
2028 			if (!ret)
2029 				goto out;
2030 
2031 			break;
2032 
2033 		case IWL_MIMO3_SWITCH_MIMO2_AB:
2034 		case IWL_MIMO3_SWITCH_MIMO2_AC:
2035 		case IWL_MIMO3_SWITCH_MIMO2_BC:
2036 			IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2037 
2038 			memcpy(search_tbl, tbl, sz);
2039 			search_tbl->is_SGI = 0;
2040 			if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2041 				search_tbl->ant_type = ANT_AB;
2042 			else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2043 				search_tbl->ant_type = ANT_AC;
2044 			else
2045 				search_tbl->ant_type = ANT_BC;
2046 
2047 			if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2048 				break;
2049 
2050 			ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2051 						 search_tbl, index);
2052 			if (!ret)
2053 				goto out;
2054 
2055 			break;
2056 
2057 		case IWL_MIMO3_SWITCH_GI:
2058 			if (!tbl->is_ht40 && !(ht_cap->cap &
2059 						IEEE80211_HT_CAP_SGI_20))
2060 				break;
2061 			if (tbl->is_ht40 && !(ht_cap->cap &
2062 						IEEE80211_HT_CAP_SGI_40))
2063 				break;
2064 
2065 			IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2066 
2067 			/* Set up new search table for MIMO */
2068 			memcpy(search_tbl, tbl, sz);
2069 			search_tbl->is_SGI = !tbl->is_SGI;
2070 			rs_set_expected_tpt_table(lq_sta, search_tbl);
2071 			/*
2072 			 * If active table already uses the fastest possible
2073 			 * modulation (dual stream with short guard interval),
2074 			 * and it's working well, there's no need to look
2075 			 * for a better type of modulation!
2076 			 */
2077 			if (tbl->is_SGI) {
2078 				s32 tpt = lq_sta->last_tpt / 100;
2079 				if (tpt >= search_tbl->expected_tpt[index])
2080 					break;
2081 			}
2082 			search_tbl->current_rate =
2083 				rate_n_flags_from_tbl(priv, search_tbl,
2084 						      index, is_green);
2085 			update_search_tbl_counter = 1;
2086 			goto out;
2087 		}
2088 		tbl->action++;
2089 		if (tbl->action > IWL_MIMO3_SWITCH_GI)
2090 			tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2091 
2092 		if (tbl->action == start_action)
2093 			break;
2094 	}
2095 	search_tbl->lq_type = LQ_NONE;
2096 	return 0;
2097  out:
2098 	lq_sta->search_better_tbl = 1;
2099 	tbl->action++;
2100 	if (tbl->action > IWL_MIMO3_SWITCH_GI)
2101 		tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2102 	if (update_search_tbl_counter)
2103 		search_tbl->action = tbl->action;
2104 
2105 	return 0;
2106 
2107 }
2108 
2109 /*
2110  * Check whether we should continue using same modulation mode, or
2111  * begin search for a new mode, based on:
2112  * 1) # tx successes or failures while using this mode
2113  * 2) # times calling this function
2114  * 3) elapsed time in this mode (not used, for now)
2115  */
rs_stay_in_table(struct iwl_lq_sta * lq_sta,bool force_search)2116 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2117 {
2118 	struct iwl_scale_tbl_info *tbl;
2119 	int i;
2120 	int active_tbl;
2121 	int flush_interval_passed = 0;
2122 	struct iwl_priv *priv;
2123 
2124 	priv = lq_sta->drv;
2125 	active_tbl = lq_sta->active_tbl;
2126 
2127 	tbl = &(lq_sta->lq_info[active_tbl]);
2128 
2129 	/* If we've been disallowing search, see if we should now allow it */
2130 	if (lq_sta->stay_in_tbl) {
2131 
2132 		/* Elapsed time using current modulation mode */
2133 		if (lq_sta->flush_timer)
2134 			flush_interval_passed =
2135 			time_after(jiffies,
2136 					(unsigned long)(lq_sta->flush_timer +
2137 					IWL_RATE_SCALE_FLUSH_INTVL));
2138 
2139 		/*
2140 		 * Check if we should allow search for new modulation mode.
2141 		 * If many frames have failed or succeeded, or we've used
2142 		 * this same modulation for a long time, allow search, and
2143 		 * reset history stats that keep track of whether we should
2144 		 * allow a new search.  Also (below) reset all bitmaps and
2145 		 * stats in active history.
2146 		 */
2147 		if (force_search ||
2148 		    (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2149 		    (lq_sta->total_success > lq_sta->max_success_limit) ||
2150 		    ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2151 		     && (flush_interval_passed))) {
2152 			IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n",
2153 				     lq_sta->total_failed,
2154 				     lq_sta->total_success,
2155 				     flush_interval_passed);
2156 
2157 			/* Allow search for new mode */
2158 			lq_sta->stay_in_tbl = 0;	/* only place reset */
2159 			lq_sta->total_failed = 0;
2160 			lq_sta->total_success = 0;
2161 			lq_sta->flush_timer = 0;
2162 
2163 		/*
2164 		 * Else if we've used this modulation mode enough repetitions
2165 		 * (regardless of elapsed time or success/failure), reset
2166 		 * history bitmaps and rate-specific stats for all rates in
2167 		 * active table.
2168 		 */
2169 		} else {
2170 			lq_sta->table_count++;
2171 			if (lq_sta->table_count >=
2172 			    lq_sta->table_count_limit) {
2173 				lq_sta->table_count = 0;
2174 
2175 				IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2176 				for (i = 0; i < IWL_RATE_COUNT; i++)
2177 					rs_rate_scale_clear_window(
2178 						&(tbl->win[i]));
2179 			}
2180 		}
2181 
2182 		/* If transitioning to allow "search", reset all history
2183 		 * bitmaps and stats in active table (this will become the new
2184 		 * "search" table). */
2185 		if (!lq_sta->stay_in_tbl) {
2186 			for (i = 0; i < IWL_RATE_COUNT; i++)
2187 				rs_rate_scale_clear_window(&(tbl->win[i]));
2188 		}
2189 	}
2190 }
2191 
2192 /*
2193  * setup rate table in uCode
2194  */
rs_update_rate_tbl(struct iwl_priv * priv,struct iwl_rxon_context * ctx,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,int index,u8 is_green)2195 static void rs_update_rate_tbl(struct iwl_priv *priv,
2196 			       struct iwl_rxon_context *ctx,
2197 			       struct iwl_lq_sta *lq_sta,
2198 			       struct iwl_scale_tbl_info *tbl,
2199 			       int index, u8 is_green)
2200 {
2201 	u32 rate;
2202 
2203 	/* Update uCode's rate table. */
2204 	rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2205 	rs_fill_link_cmd(priv, lq_sta, rate);
2206 	iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2207 }
2208 
2209 /*
2210  * Do rate scaling and search for new modulation mode.
2211  */
rs_rate_scale_perform(struct iwl_priv * priv,struct sk_buff * skb,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)2212 static void rs_rate_scale_perform(struct iwl_priv *priv,
2213 				  struct sk_buff *skb,
2214 				  struct ieee80211_sta *sta,
2215 				  struct iwl_lq_sta *lq_sta)
2216 {
2217 	struct ieee80211_hw *hw = priv->hw;
2218 	struct ieee80211_conf *conf = &hw->conf;
2219 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2220 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2221 	int low = IWL_RATE_INVALID;
2222 	int high = IWL_RATE_INVALID;
2223 	int index;
2224 	int i;
2225 	struct iwl_rate_scale_data *window = NULL;
2226 	int current_tpt = IWL_INVALID_VALUE;
2227 	int low_tpt = IWL_INVALID_VALUE;
2228 	int high_tpt = IWL_INVALID_VALUE;
2229 	u32 fail_count;
2230 	s8 scale_action = 0;
2231 	u16 rate_mask;
2232 	u8 update_lq = 0;
2233 	struct iwl_scale_tbl_info *tbl, *tbl1;
2234 	u16 rate_scale_index_msk = 0;
2235 	u8 is_green = 0;
2236 	u8 active_tbl = 0;
2237 	u8 done_search = 0;
2238 	u16 high_low;
2239 	s32 sr;
2240 	u8 tid = IWL_MAX_TID_COUNT;
2241 	struct iwl_tid_data *tid_data;
2242 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2243 	struct iwl_rxon_context *ctx = sta_priv->ctx;
2244 
2245 	IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2246 
2247 	/* Send management frames and NO_ACK data using lowest rate. */
2248 	/* TODO: this could probably be improved.. */
2249 	if (!ieee80211_is_data(hdr->frame_control) ||
2250 	    info->flags & IEEE80211_TX_CTL_NO_ACK)
2251 		return;
2252 
2253 	lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2254 
2255 	tid = rs_tl_add_packet(lq_sta, hdr);
2256 	if ((tid != IWL_MAX_TID_COUNT) &&
2257 	    (lq_sta->tx_agg_tid_en & (1 << tid))) {
2258 		tid_data = &priv->tid_data[lq_sta->lq.sta_id][tid];
2259 		if (tid_data->agg.state == IWL_AGG_OFF)
2260 			lq_sta->is_agg = 0;
2261 		else
2262 			lq_sta->is_agg = 1;
2263 	} else
2264 		lq_sta->is_agg = 0;
2265 
2266 	/*
2267 	 * Select rate-scale / modulation-mode table to work with in
2268 	 * the rest of this function:  "search" if searching for better
2269 	 * modulation mode, or "active" if doing rate scaling within a mode.
2270 	 */
2271 	if (!lq_sta->search_better_tbl)
2272 		active_tbl = lq_sta->active_tbl;
2273 	else
2274 		active_tbl = 1 - lq_sta->active_tbl;
2275 
2276 	tbl = &(lq_sta->lq_info[active_tbl]);
2277 	if (is_legacy(tbl->lq_type))
2278 		lq_sta->is_green = 0;
2279 	else
2280 		lq_sta->is_green = rs_use_green(sta);
2281 	is_green = lq_sta->is_green;
2282 
2283 	/* current tx rate */
2284 	index = lq_sta->last_txrate_idx;
2285 
2286 	IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2287 		       tbl->lq_type);
2288 
2289 	/* rates available for this association, and for modulation mode */
2290 	rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2291 
2292 	IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2293 
2294 	/* mask with station rate restriction */
2295 	if (is_legacy(tbl->lq_type)) {
2296 		if (lq_sta->band == IEEE80211_BAND_5GHZ)
2297 			/* supp_rates has no CCK bits in A mode */
2298 			rate_scale_index_msk = (u16) (rate_mask &
2299 				(lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2300 		else
2301 			rate_scale_index_msk = (u16) (rate_mask &
2302 						      lq_sta->supp_rates);
2303 
2304 	} else
2305 		rate_scale_index_msk = rate_mask;
2306 
2307 	if (!rate_scale_index_msk)
2308 		rate_scale_index_msk = rate_mask;
2309 
2310 	if (!((1 << index) & rate_scale_index_msk)) {
2311 		IWL_ERR(priv, "Current Rate is not valid\n");
2312 		if (lq_sta->search_better_tbl) {
2313 			/* revert to active table if search table is not valid*/
2314 			tbl->lq_type = LQ_NONE;
2315 			lq_sta->search_better_tbl = 0;
2316 			tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2317 			/* get "active" rate info */
2318 			index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2319 			rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2320 					   index, is_green);
2321 		}
2322 		return;
2323 	}
2324 
2325 	/* Get expected throughput table and history window for current rate */
2326 	if (!tbl->expected_tpt) {
2327 		IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2328 		return;
2329 	}
2330 
2331 	/* force user max rate if set by user */
2332 	if ((lq_sta->max_rate_idx != -1) &&
2333 	    (lq_sta->max_rate_idx < index)) {
2334 		index = lq_sta->max_rate_idx;
2335 		update_lq = 1;
2336 		window = &(tbl->win[index]);
2337 		goto lq_update;
2338 	}
2339 
2340 	window = &(tbl->win[index]);
2341 
2342 	/*
2343 	 * If there is not enough history to calculate actual average
2344 	 * throughput, keep analyzing results of more tx frames, without
2345 	 * changing rate or mode (bypass most of the rest of this function).
2346 	 * Set up new rate table in uCode only if old rate is not supported
2347 	 * in current association (use new rate found above).
2348 	 */
2349 	fail_count = window->counter - window->success_counter;
2350 	if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2351 			(window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2352 		IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2353 			       "for index %d\n",
2354 			       window->success_counter, window->counter, index);
2355 
2356 		/* Can't calculate this yet; not enough history */
2357 		window->average_tpt = IWL_INVALID_VALUE;
2358 
2359 		/* Should we stay with this modulation mode,
2360 		 * or search for a new one? */
2361 		rs_stay_in_table(lq_sta, false);
2362 
2363 		goto out;
2364 	}
2365 	/* Else we have enough samples; calculate estimate of
2366 	 * actual average throughput */
2367 	if (window->average_tpt != ((window->success_ratio *
2368 			tbl->expected_tpt[index] + 64) / 128)) {
2369 		IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2370 		window->average_tpt = ((window->success_ratio *
2371 					tbl->expected_tpt[index] + 64) / 128);
2372 	}
2373 
2374 	/* If we are searching for better modulation mode, check success. */
2375 	if (lq_sta->search_better_tbl &&
2376 	    (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2377 		/* If good success, continue using the "search" mode;
2378 		 * no need to send new link quality command, since we're
2379 		 * continuing to use the setup that we've been trying. */
2380 		if (window->average_tpt > lq_sta->last_tpt) {
2381 
2382 			IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2383 					"suc=%d cur-tpt=%d old-tpt=%d\n",
2384 					window->success_ratio,
2385 					window->average_tpt,
2386 					lq_sta->last_tpt);
2387 
2388 			if (!is_legacy(tbl->lq_type))
2389 				lq_sta->enable_counter = 1;
2390 
2391 			/* Swap tables; "search" becomes "active" */
2392 			lq_sta->active_tbl = active_tbl;
2393 			current_tpt = window->average_tpt;
2394 
2395 		/* Else poor success; go back to mode in "active" table */
2396 		} else {
2397 
2398 			IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2399 					"suc=%d cur-tpt=%d old-tpt=%d\n",
2400 					window->success_ratio,
2401 					window->average_tpt,
2402 					lq_sta->last_tpt);
2403 
2404 			/* Nullify "search" table */
2405 			tbl->lq_type = LQ_NONE;
2406 
2407 			/* Revert to "active" table */
2408 			active_tbl = lq_sta->active_tbl;
2409 			tbl = &(lq_sta->lq_info[active_tbl]);
2410 
2411 			/* Revert to "active" rate and throughput info */
2412 			index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2413 			current_tpt = lq_sta->last_tpt;
2414 
2415 			/* Need to set up a new rate table in uCode */
2416 			update_lq = 1;
2417 		}
2418 
2419 		/* Either way, we've made a decision; modulation mode
2420 		 * search is done, allow rate adjustment next time. */
2421 		lq_sta->search_better_tbl = 0;
2422 		done_search = 1;	/* Don't switch modes below! */
2423 		goto lq_update;
2424 	}
2425 
2426 	/* (Else) not in search of better modulation mode, try for better
2427 	 * starting rate, while staying in this mode. */
2428 	high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2429 					tbl->lq_type);
2430 	low = high_low & 0xff;
2431 	high = (high_low >> 8) & 0xff;
2432 
2433 	/* If user set max rate, dont allow higher than user constrain */
2434 	if ((lq_sta->max_rate_idx != -1) &&
2435 	    (lq_sta->max_rate_idx < high))
2436 		high = IWL_RATE_INVALID;
2437 
2438 	sr = window->success_ratio;
2439 
2440 	/* Collect measured throughputs for current and adjacent rates */
2441 	current_tpt = window->average_tpt;
2442 	if (low != IWL_RATE_INVALID)
2443 		low_tpt = tbl->win[low].average_tpt;
2444 	if (high != IWL_RATE_INVALID)
2445 		high_tpt = tbl->win[high].average_tpt;
2446 
2447 	scale_action = 0;
2448 
2449 	/* Too many failures, decrease rate */
2450 	if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2451 		IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2452 		scale_action = -1;
2453 
2454 	/* No throughput measured yet for adjacent rates; try increase. */
2455 	} else if ((low_tpt == IWL_INVALID_VALUE) &&
2456 		   (high_tpt == IWL_INVALID_VALUE)) {
2457 
2458 		if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2459 			scale_action = 1;
2460 		else if (low != IWL_RATE_INVALID)
2461 			scale_action = 0;
2462 	}
2463 
2464 	/* Both adjacent throughputs are measured, but neither one has better
2465 	 * throughput; we're using the best rate, don't change it! */
2466 	else if ((low_tpt != IWL_INVALID_VALUE) &&
2467 		 (high_tpt != IWL_INVALID_VALUE) &&
2468 		 (low_tpt < current_tpt) &&
2469 		 (high_tpt < current_tpt))
2470 		scale_action = 0;
2471 
2472 	/* At least one adjacent rate's throughput is measured,
2473 	 * and may have better performance. */
2474 	else {
2475 		/* Higher adjacent rate's throughput is measured */
2476 		if (high_tpt != IWL_INVALID_VALUE) {
2477 			/* Higher rate has better throughput */
2478 			if (high_tpt > current_tpt &&
2479 					sr >= IWL_RATE_INCREASE_TH) {
2480 				scale_action = 1;
2481 			} else {
2482 				scale_action = 0;
2483 			}
2484 
2485 		/* Lower adjacent rate's throughput is measured */
2486 		} else if (low_tpt != IWL_INVALID_VALUE) {
2487 			/* Lower rate has better throughput */
2488 			if (low_tpt > current_tpt) {
2489 				IWL_DEBUG_RATE(priv,
2490 				    "decrease rate because of low tpt\n");
2491 				scale_action = -1;
2492 			} else if (sr >= IWL_RATE_INCREASE_TH) {
2493 				scale_action = 1;
2494 			}
2495 		}
2496 	}
2497 
2498 	/* Sanity check; asked for decrease, but success rate or throughput
2499 	 * has been good at old rate.  Don't change it. */
2500 	if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2501 		    ((sr > IWL_RATE_HIGH_TH) ||
2502 		     (current_tpt > (100 * tbl->expected_tpt[low]))))
2503 		scale_action = 0;
2504 	if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2505 		scale_action = -1;
2506 	if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2507 		(is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2508 		scale_action = -1;
2509 
2510 	if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2511 	     (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2512 		if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2513 			/*
2514 			 * don't set scale_action, don't want to scale up if
2515 			 * the rate scale doesn't otherwise think that is a
2516 			 * good idea.
2517 			 */
2518 		} else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2519 			scale_action = -1;
2520 		}
2521 	}
2522 	lq_sta->last_bt_traffic = priv->bt_traffic_load;
2523 
2524 	if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2525 	     (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2526 		/* search for a new modulation */
2527 		rs_stay_in_table(lq_sta, true);
2528 		goto lq_update;
2529 	}
2530 
2531 	switch (scale_action) {
2532 	case -1:
2533 		/* Decrease starting rate, update uCode's rate table */
2534 		if (low != IWL_RATE_INVALID) {
2535 			update_lq = 1;
2536 			index = low;
2537 		}
2538 
2539 		break;
2540 	case 1:
2541 		/* Increase starting rate, update uCode's rate table */
2542 		if (high != IWL_RATE_INVALID) {
2543 			update_lq = 1;
2544 			index = high;
2545 		}
2546 
2547 		break;
2548 	case 0:
2549 		/* No change */
2550 	default:
2551 		break;
2552 	}
2553 
2554 	IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2555 		    "high %d type %d\n",
2556 		     index, scale_action, low, high, tbl->lq_type);
2557 
2558 lq_update:
2559 	/* Replace uCode's rate table for the destination station. */
2560 	if (update_lq)
2561 		rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2562 
2563 	if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2564 		/* Should we stay with this modulation mode,
2565 		 * or search for a new one? */
2566 	  rs_stay_in_table(lq_sta, false);
2567 	}
2568 	/*
2569 	 * Search for new modulation mode if we're:
2570 	 * 1)  Not changing rates right now
2571 	 * 2)  Not just finishing up a search
2572 	 * 3)  Allowing a new search
2573 	 */
2574 	if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2575 		/* Save current throughput to compare with "search" throughput*/
2576 		lq_sta->last_tpt = current_tpt;
2577 
2578 		/* Select a new "search" modulation mode to try.
2579 		 * If one is found, set up the new "search" table. */
2580 		if (is_legacy(tbl->lq_type))
2581 			rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2582 		else if (is_siso(tbl->lq_type))
2583 			rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2584 		else if (is_mimo2(tbl->lq_type))
2585 			rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2586 		else
2587 			rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2588 
2589 		/* If new "search" mode was selected, set up in uCode table */
2590 		if (lq_sta->search_better_tbl) {
2591 			/* Access the "search" table, clear its history. */
2592 			tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2593 			for (i = 0; i < IWL_RATE_COUNT; i++)
2594 				rs_rate_scale_clear_window(&(tbl->win[i]));
2595 
2596 			/* Use new "search" start rate */
2597 			index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2598 
2599 			IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2600 				     tbl->current_rate, index);
2601 			rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2602 			iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2603 		} else
2604 			done_search = 1;
2605 	}
2606 
2607 	if (done_search && !lq_sta->stay_in_tbl) {
2608 		/* If the "active" (non-search) mode was legacy,
2609 		 * and we've tried switching antennas,
2610 		 * but we haven't been able to try HT modes (not available),
2611 		 * stay with best antenna legacy modulation for a while
2612 		 * before next round of mode comparisons. */
2613 		tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2614 		if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2615 		    lq_sta->action_counter > tbl1->max_search) {
2616 			IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2617 			rs_set_stay_in_table(priv, 1, lq_sta);
2618 		}
2619 
2620 		/* If we're in an HT mode, and all 3 mode switch actions
2621 		 * have been tried and compared, stay in this best modulation
2622 		 * mode for a while before next round of mode comparisons. */
2623 		if (lq_sta->enable_counter &&
2624 		    (lq_sta->action_counter >= tbl1->max_search) &&
2625 		    iwl_ht_enabled(priv)) {
2626 			if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2627 			    (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2628 			    (tid != IWL_MAX_TID_COUNT)) {
2629 				u8 sta_id = lq_sta->lq.sta_id;
2630 				tid_data = &priv->tid_data[sta_id][tid];
2631 				if (tid_data->agg.state == IWL_AGG_OFF) {
2632 					IWL_DEBUG_RATE(priv,
2633 						       "try to aggregate tid %d\n",
2634 						       tid);
2635 					rs_tl_turn_on_agg(priv, tid,
2636 							  lq_sta, sta);
2637 				}
2638 			}
2639 			rs_set_stay_in_table(priv, 0, lq_sta);
2640 		}
2641 	}
2642 
2643 out:
2644 	tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2645 	lq_sta->last_txrate_idx = index;
2646 }
2647 
2648 /**
2649  * rs_initialize_lq - Initialize a station's hardware rate table
2650  *
2651  * The uCode's station table contains a table of fallback rates
2652  * for automatic fallback during transmission.
2653  *
2654  * NOTE: This sets up a default set of values.  These will be replaced later
2655  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2656  *       rc80211_simple.
2657  *
2658  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2659  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2660  *       which requires station table entry to exist).
2661  */
rs_initialize_lq(struct iwl_priv * priv,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)2662 static void rs_initialize_lq(struct iwl_priv *priv,
2663 			     struct ieee80211_sta *sta,
2664 			     struct iwl_lq_sta *lq_sta)
2665 {
2666 	struct iwl_scale_tbl_info *tbl;
2667 	int rate_idx;
2668 	int i;
2669 	u32 rate;
2670 	u8 use_green = rs_use_green(sta);
2671 	u8 active_tbl = 0;
2672 	u8 valid_tx_ant;
2673 	struct iwl_station_priv *sta_priv;
2674 	struct iwl_rxon_context *ctx;
2675 
2676 	if (!sta || !lq_sta)
2677 		return;
2678 
2679 	sta_priv = (void *)sta->drv_priv;
2680 	ctx = sta_priv->ctx;
2681 
2682 	i = lq_sta->last_txrate_idx;
2683 
2684 	valid_tx_ant = priv->nvm_data->valid_tx_ant;
2685 
2686 	if (!lq_sta->search_better_tbl)
2687 		active_tbl = lq_sta->active_tbl;
2688 	else
2689 		active_tbl = 1 - lq_sta->active_tbl;
2690 
2691 	tbl = &(lq_sta->lq_info[active_tbl]);
2692 
2693 	if ((i < 0) || (i >= IWL_RATE_COUNT))
2694 		i = 0;
2695 
2696 	rate = iwl_rates[i].plcp;
2697 	tbl->ant_type = first_antenna(valid_tx_ant);
2698 	rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2699 
2700 	if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2701 		rate |= RATE_MCS_CCK_MSK;
2702 
2703 	rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2704 	if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2705 	    rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2706 
2707 	rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2708 	tbl->current_rate = rate;
2709 	rs_set_expected_tpt_table(lq_sta, tbl);
2710 	rs_fill_link_cmd(NULL, lq_sta, rate);
2711 	priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2712 	iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, 0, true);
2713 }
2714 
rs_get_rate(void * priv_r,struct ieee80211_sta * sta,void * priv_sta,struct ieee80211_tx_rate_control * txrc)2715 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2716 			struct ieee80211_tx_rate_control *txrc)
2717 {
2718 
2719 	struct sk_buff *skb = txrc->skb;
2720 	struct ieee80211_supported_band *sband = txrc->sband;
2721 	struct iwl_op_mode *op_mode __maybe_unused =
2722 			(struct iwl_op_mode *)priv_r;
2723 	struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2724 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2725 	struct iwl_lq_sta *lq_sta = priv_sta;
2726 	int rate_idx;
2727 
2728 	IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2729 
2730 	/* Get max rate if user set max rate */
2731 	if (lq_sta) {
2732 		lq_sta->max_rate_idx = txrc->max_rate_idx;
2733 		if ((sband->band == IEEE80211_BAND_5GHZ) &&
2734 		    (lq_sta->max_rate_idx != -1))
2735 			lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2736 		if ((lq_sta->max_rate_idx < 0) ||
2737 		    (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2738 			lq_sta->max_rate_idx = -1;
2739 	}
2740 
2741 	/* Treat uninitialized rate scaling data same as non-existing. */
2742 	if (lq_sta && !lq_sta->drv) {
2743 		IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2744 		priv_sta = NULL;
2745 	}
2746 
2747 	/* Send management frames and NO_ACK data using lowest rate. */
2748 	if (rate_control_send_low(sta, priv_sta, txrc))
2749 		return;
2750 
2751 	rate_idx  = lq_sta->last_txrate_idx;
2752 
2753 	if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2754 		rate_idx -= IWL_FIRST_OFDM_RATE;
2755 		/* 6M and 9M shared same MCS index */
2756 		rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2757 		if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2758 		    IWL_RATE_MIMO3_6M_PLCP)
2759 			rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2760 		else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2761 			 IWL_RATE_MIMO2_6M_PLCP)
2762 			rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2763 		info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2764 		if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2765 			info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2766 		if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2767 			info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2768 		if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2769 			info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2770 		if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2771 			info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2772 	} else {
2773 		/* Check for invalid rates */
2774 		if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2775 				((sband->band == IEEE80211_BAND_5GHZ) &&
2776 				 (rate_idx < IWL_FIRST_OFDM_RATE)))
2777 			rate_idx = rate_lowest_index(sband, sta);
2778 		/* On valid 5 GHz rate, adjust index */
2779 		else if (sband->band == IEEE80211_BAND_5GHZ)
2780 			rate_idx -= IWL_FIRST_OFDM_RATE;
2781 		info->control.rates[0].flags = 0;
2782 	}
2783 	info->control.rates[0].idx = rate_idx;
2784 	info->control.rates[0].count = 1;
2785 }
2786 
rs_alloc_sta(void * priv_rate,struct ieee80211_sta * sta,gfp_t gfp)2787 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2788 			  gfp_t gfp)
2789 {
2790 	struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2791 	struct iwl_op_mode *op_mode __maybe_unused =
2792 			(struct iwl_op_mode *)priv_rate;
2793 	struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
2794 
2795 	IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2796 
2797 	return &sta_priv->lq_sta;
2798 }
2799 
2800 /*
2801  * Called after adding a new station to initialize rate scaling
2802  */
iwl_rs_rate_init(struct iwl_priv * priv,struct ieee80211_sta * sta,u8 sta_id)2803 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2804 {
2805 	int i, j;
2806 	struct ieee80211_hw *hw = priv->hw;
2807 	struct ieee80211_conf *conf = &priv->hw->conf;
2808 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2809 	struct iwl_station_priv *sta_priv;
2810 	struct iwl_lq_sta *lq_sta;
2811 	struct ieee80211_supported_band *sband;
2812 	unsigned long supp; /* must be unsigned long for for_each_set_bit */
2813 
2814 	sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2815 	lq_sta = &sta_priv->lq_sta;
2816 	sband = hw->wiphy->bands[conf->chandef.chan->band];
2817 
2818 
2819 	lq_sta->lq.sta_id = sta_id;
2820 
2821 	for (j = 0; j < LQ_SIZE; j++)
2822 		for (i = 0; i < IWL_RATE_COUNT; i++)
2823 			rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2824 
2825 	lq_sta->flush_timer = 0;
2826 	lq_sta->supp_rates = sta->supp_rates[sband->band];
2827 
2828 	IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2829 		       sta_id);
2830 	/* TODO: what is a good starting rate for STA? About middle? Maybe not
2831 	 * the lowest or the highest rate.. Could consider using RSSI from
2832 	 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2833 	 * after assoc.. */
2834 
2835 	lq_sta->is_dup = 0;
2836 	lq_sta->max_rate_idx = -1;
2837 	lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2838 	lq_sta->is_green = rs_use_green(sta);
2839 	lq_sta->band = sband->band;
2840 	/*
2841 	 * active legacy rates as per supported rates bitmap
2842 	 */
2843 	supp = sta->supp_rates[sband->band];
2844 	lq_sta->active_legacy_rate = 0;
2845 	for_each_set_bit(i, &supp, BITS_PER_LONG)
2846 		lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2847 
2848 	/*
2849 	 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2850 	 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2851 	 */
2852 	lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2853 	lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2854 	lq_sta->active_siso_rate &= ~((u16)0x2);
2855 	lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2856 
2857 	/* Same here */
2858 	lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2859 	lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2860 	lq_sta->active_mimo2_rate &= ~((u16)0x2);
2861 	lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2862 
2863 	lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2864 	lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2865 	lq_sta->active_mimo3_rate &= ~((u16)0x2);
2866 	lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2867 
2868 	IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2869 		     lq_sta->active_siso_rate,
2870 		     lq_sta->active_mimo2_rate,
2871 		     lq_sta->active_mimo3_rate);
2872 
2873 	/* These values will be overridden later */
2874 	lq_sta->lq.general_params.single_stream_ant_msk =
2875 		first_antenna(priv->nvm_data->valid_tx_ant);
2876 	lq_sta->lq.general_params.dual_stream_ant_msk =
2877 		priv->nvm_data->valid_tx_ant &
2878 		~first_antenna(priv->nvm_data->valid_tx_ant);
2879 	if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2880 		lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2881 	} else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
2882 		lq_sta->lq.general_params.dual_stream_ant_msk =
2883 			priv->nvm_data->valid_tx_ant;
2884 	}
2885 
2886 	/* as default allow aggregation for all tids */
2887 	lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2888 	lq_sta->drv = priv;
2889 
2890 	/* Set last_txrate_idx to lowest rate */
2891 	lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2892 	if (sband->band == IEEE80211_BAND_5GHZ)
2893 		lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2894 	lq_sta->is_agg = 0;
2895 #ifdef CONFIG_MAC80211_DEBUGFS
2896 	lq_sta->dbg_fixed_rate = 0;
2897 #endif
2898 
2899 	rs_initialize_lq(priv, sta, lq_sta);
2900 }
2901 
rs_fill_link_cmd(struct iwl_priv * priv,struct iwl_lq_sta * lq_sta,u32 new_rate)2902 static void rs_fill_link_cmd(struct iwl_priv *priv,
2903 			     struct iwl_lq_sta *lq_sta, u32 new_rate)
2904 {
2905 	struct iwl_scale_tbl_info tbl_type;
2906 	int index = 0;
2907 	int rate_idx;
2908 	int repeat_rate = 0;
2909 	u8 ant_toggle_cnt = 0;
2910 	u8 use_ht_possible = 1;
2911 	u8 valid_tx_ant = 0;
2912 	struct iwl_station_priv *sta_priv =
2913 		container_of(lq_sta, struct iwl_station_priv, lq_sta);
2914 	struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2915 
2916 	/* Override starting rate (index 0) if needed for debug purposes */
2917 	rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2918 
2919 	/* Interpret new_rate (rate_n_flags) */
2920 	rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2921 				  &tbl_type, &rate_idx);
2922 
2923 	if (priv && priv->bt_full_concurrent) {
2924 		/* 1x1 only */
2925 		tbl_type.ant_type =
2926 			first_antenna(priv->nvm_data->valid_tx_ant);
2927 	}
2928 
2929 	/* How many times should we repeat the initial rate? */
2930 	if (is_legacy(tbl_type.lq_type)) {
2931 		ant_toggle_cnt = 1;
2932 		repeat_rate = IWL_NUMBER_TRY;
2933 	} else {
2934 		repeat_rate = min(IWL_HT_NUMBER_TRY,
2935 				  LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2936 	}
2937 
2938 	lq_cmd->general_params.mimo_delimiter =
2939 			is_mimo(tbl_type.lq_type) ? 1 : 0;
2940 
2941 	/* Fill 1st table entry (index 0) */
2942 	lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2943 
2944 	if (num_of_ant(tbl_type.ant_type) == 1) {
2945 		lq_cmd->general_params.single_stream_ant_msk =
2946 						tbl_type.ant_type;
2947 	} else if (num_of_ant(tbl_type.ant_type) == 2) {
2948 		lq_cmd->general_params.dual_stream_ant_msk =
2949 						tbl_type.ant_type;
2950 	} /* otherwise we don't modify the existing value */
2951 
2952 	index++;
2953 	repeat_rate--;
2954 	if (priv) {
2955 		if (priv->bt_full_concurrent)
2956 			valid_tx_ant = ANT_A;
2957 		else
2958 			valid_tx_ant = priv->nvm_data->valid_tx_ant;
2959 	}
2960 
2961 	/* Fill rest of rate table */
2962 	while (index < LINK_QUAL_MAX_RETRY_NUM) {
2963 		/* Repeat initial/next rate.
2964 		 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2965 		 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2966 		while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2967 			if (is_legacy(tbl_type.lq_type)) {
2968 				if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2969 					ant_toggle_cnt++;
2970 				else if (priv &&
2971 					 rs_toggle_antenna(valid_tx_ant,
2972 							&new_rate, &tbl_type))
2973 					ant_toggle_cnt = 1;
2974 			}
2975 
2976 			/* Override next rate if needed for debug purposes */
2977 			rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2978 
2979 			/* Fill next table entry */
2980 			lq_cmd->rs_table[index].rate_n_flags =
2981 					cpu_to_le32(new_rate);
2982 			repeat_rate--;
2983 			index++;
2984 		}
2985 
2986 		rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2987 						&rate_idx);
2988 
2989 		if (priv && priv->bt_full_concurrent) {
2990 			/* 1x1 only */
2991 			tbl_type.ant_type =
2992 			    first_antenna(priv->nvm_data->valid_tx_ant);
2993 		}
2994 
2995 		/* Indicate to uCode which entries might be MIMO.
2996 		 * If initial rate was MIMO, this will finally end up
2997 		 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2998 		if (is_mimo(tbl_type.lq_type))
2999 			lq_cmd->general_params.mimo_delimiter = index;
3000 
3001 		/* Get next rate */
3002 		new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3003 					     use_ht_possible);
3004 
3005 		/* How many times should we repeat the next rate? */
3006 		if (is_legacy(tbl_type.lq_type)) {
3007 			if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3008 				ant_toggle_cnt++;
3009 			else if (priv &&
3010 				 rs_toggle_antenna(valid_tx_ant,
3011 						   &new_rate, &tbl_type))
3012 				ant_toggle_cnt = 1;
3013 
3014 			repeat_rate = IWL_NUMBER_TRY;
3015 		} else {
3016 			repeat_rate = IWL_HT_NUMBER_TRY;
3017 		}
3018 
3019 		/* Don't allow HT rates after next pass.
3020 		 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3021 		use_ht_possible = 0;
3022 
3023 		/* Override next rate if needed for debug purposes */
3024 		rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3025 
3026 		/* Fill next table entry */
3027 		lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3028 
3029 		index++;
3030 		repeat_rate--;
3031 	}
3032 
3033 	lq_cmd->agg_params.agg_frame_cnt_limit =
3034 		sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3035 	lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3036 
3037 	lq_cmd->agg_params.agg_time_limit =
3038 		cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3039 	/*
3040 	 * overwrite if needed, pass aggregation time limit
3041 	 * to uCode in uSec
3042 	 */
3043 	if (priv && priv->lib->bt_params &&
3044 	    priv->lib->bt_params->agg_time_limit &&
3045 	    priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3046 		lq_cmd->agg_params.agg_time_limit =
3047 			cpu_to_le16(priv->lib->bt_params->agg_time_limit);
3048 }
3049 
rs_alloc(struct ieee80211_hw * hw,struct dentry * debugfsdir)3050 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3051 {
3052 	return hw->priv;
3053 }
3054 /* rate scale requires free function to be implemented */
rs_free(void * priv_rate)3055 static void rs_free(void *priv_rate)
3056 {
3057 	return;
3058 }
3059 
rs_free_sta(void * priv_r,struct ieee80211_sta * sta,void * priv_sta)3060 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3061 			void *priv_sta)
3062 {
3063 	struct iwl_op_mode *op_mode __maybe_unused = priv_r;
3064 	struct iwl_priv *priv __maybe_unused = IWL_OP_MODE_GET_DVM(op_mode);
3065 
3066 	IWL_DEBUG_RATE(priv, "enter\n");
3067 	IWL_DEBUG_RATE(priv, "leave\n");
3068 }
3069 
3070 #ifdef CONFIG_MAC80211_DEBUGFS
rs_dbgfs_set_mcs(struct iwl_lq_sta * lq_sta,u32 * rate_n_flags,int index)3071 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3072 			     u32 *rate_n_flags, int index)
3073 {
3074 	struct iwl_priv *priv;
3075 	u8 valid_tx_ant;
3076 	u8 ant_sel_tx;
3077 
3078 	priv = lq_sta->drv;
3079 	valid_tx_ant = priv->nvm_data->valid_tx_ant;
3080 	if (lq_sta->dbg_fixed_rate) {
3081 		ant_sel_tx =
3082 		  ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3083 		  >> RATE_MCS_ANT_POS);
3084 		if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3085 			*rate_n_flags = lq_sta->dbg_fixed_rate;
3086 			IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3087 		} else {
3088 			lq_sta->dbg_fixed_rate = 0;
3089 			IWL_ERR(priv,
3090 			    "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3091 			    ant_sel_tx, valid_tx_ant);
3092 			IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3093 		}
3094 	} else {
3095 		IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3096 	}
3097 }
3098 
rs_sta_dbgfs_scale_table_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)3099 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3100 			const char __user *user_buf, size_t count, loff_t *ppos)
3101 {
3102 	struct iwl_lq_sta *lq_sta = file->private_data;
3103 	struct iwl_priv *priv;
3104 	char buf[64];
3105 	size_t buf_size;
3106 	u32 parsed_rate;
3107 
3108 
3109 	priv = lq_sta->drv;
3110 	memset(buf, 0, sizeof(buf));
3111 	buf_size = min(count, sizeof(buf) -  1);
3112 	if (copy_from_user(buf, user_buf, buf_size))
3113 		return -EFAULT;
3114 
3115 	if (sscanf(buf, "%x", &parsed_rate) == 1)
3116 		lq_sta->dbg_fixed_rate = parsed_rate;
3117 	else
3118 		lq_sta->dbg_fixed_rate = 0;
3119 
3120 	rs_program_fix_rate(priv, lq_sta);
3121 
3122 	return count;
3123 }
3124 
rs_sta_dbgfs_scale_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3125 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3126 			char __user *user_buf, size_t count, loff_t *ppos)
3127 {
3128 	char *buff;
3129 	int desc = 0;
3130 	int i = 0;
3131 	int index = 0;
3132 	ssize_t ret;
3133 
3134 	struct iwl_lq_sta *lq_sta = file->private_data;
3135 	struct iwl_priv *priv;
3136 	struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3137 
3138 	priv = lq_sta->drv;
3139 	buff = kmalloc(1024, GFP_KERNEL);
3140 	if (!buff)
3141 		return -ENOMEM;
3142 
3143 	desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3144 	desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3145 			lq_sta->total_failed, lq_sta->total_success,
3146 			lq_sta->active_legacy_rate);
3147 	desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3148 			lq_sta->dbg_fixed_rate);
3149 	desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3150 	    (priv->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3151 	    (priv->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3152 	    (priv->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3153 	desc += sprintf(buff+desc, "lq type %s\n",
3154 	   (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3155 	if (is_Ht(tbl->lq_type)) {
3156 		desc += sprintf(buff+desc, " %s",
3157 		   (is_siso(tbl->lq_type)) ? "SISO" :
3158 		   ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3159 		   desc += sprintf(buff+desc, " %s",
3160 		   (tbl->is_ht40) ? "40MHz" : "20MHz");
3161 		   desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3162 		   (lq_sta->is_green) ? "GF enabled" : "",
3163 		   (lq_sta->is_agg) ? "AGG on" : "");
3164 	}
3165 	desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3166 		lq_sta->last_rate_n_flags);
3167 	desc += sprintf(buff+desc, "general:"
3168 		"flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3169 		lq_sta->lq.general_params.flags,
3170 		lq_sta->lq.general_params.mimo_delimiter,
3171 		lq_sta->lq.general_params.single_stream_ant_msk,
3172 		lq_sta->lq.general_params.dual_stream_ant_msk);
3173 
3174 	desc += sprintf(buff+desc, "agg:"
3175 			"time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3176 			le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3177 			lq_sta->lq.agg_params.agg_dis_start_th,
3178 			lq_sta->lq.agg_params.agg_frame_cnt_limit);
3179 
3180 	desc += sprintf(buff+desc,
3181 			"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3182 			lq_sta->lq.general_params.start_rate_index[0],
3183 			lq_sta->lq.general_params.start_rate_index[1],
3184 			lq_sta->lq.general_params.start_rate_index[2],
3185 			lq_sta->lq.general_params.start_rate_index[3]);
3186 
3187 	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3188 		index = iwl_hwrate_to_plcp_idx(
3189 			le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3190 		if (is_legacy(tbl->lq_type)) {
3191 			desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3192 				i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3193 				iwl_rate_mcs[index].mbps);
3194 		} else {
3195 			desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3196 				i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3197 				iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3198 		}
3199 	}
3200 
3201 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3202 	kfree(buff);
3203 	return ret;
3204 }
3205 
3206 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3207 	.write = rs_sta_dbgfs_scale_table_write,
3208 	.read = rs_sta_dbgfs_scale_table_read,
3209 	.open = simple_open,
3210 	.llseek = default_llseek,
3211 };
rs_sta_dbgfs_stats_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3212 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3213 			char __user *user_buf, size_t count, loff_t *ppos)
3214 {
3215 	char *buff;
3216 	int desc = 0;
3217 	int i, j;
3218 	ssize_t ret;
3219 
3220 	struct iwl_lq_sta *lq_sta = file->private_data;
3221 
3222 	buff = kmalloc(1024, GFP_KERNEL);
3223 	if (!buff)
3224 		return -ENOMEM;
3225 
3226 	for (i = 0; i < LQ_SIZE; i++) {
3227 		desc += sprintf(buff+desc,
3228 				"%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3229 				"rate=0x%X\n",
3230 				lq_sta->active_tbl == i ? "*" : "x",
3231 				lq_sta->lq_info[i].lq_type,
3232 				lq_sta->lq_info[i].is_SGI,
3233 				lq_sta->lq_info[i].is_ht40,
3234 				lq_sta->lq_info[i].is_dup,
3235 				lq_sta->is_green,
3236 				lq_sta->lq_info[i].current_rate);
3237 		for (j = 0; j < IWL_RATE_COUNT; j++) {
3238 			desc += sprintf(buff+desc,
3239 				"counter=%d success=%d %%=%d\n",
3240 				lq_sta->lq_info[i].win[j].counter,
3241 				lq_sta->lq_info[i].win[j].success_counter,
3242 				lq_sta->lq_info[i].win[j].success_ratio);
3243 		}
3244 	}
3245 	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3246 	kfree(buff);
3247 	return ret;
3248 }
3249 
3250 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3251 	.read = rs_sta_dbgfs_stats_table_read,
3252 	.open = simple_open,
3253 	.llseek = default_llseek,
3254 };
3255 
rs_sta_dbgfs_rate_scale_data_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3256 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3257 			char __user *user_buf, size_t count, loff_t *ppos)
3258 {
3259 	struct iwl_lq_sta *lq_sta = file->private_data;
3260 	struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3261 	char buff[120];
3262 	int desc = 0;
3263 
3264 	if (is_Ht(tbl->lq_type))
3265 		desc += sprintf(buff+desc,
3266 				"Bit Rate= %d Mb/s\n",
3267 				tbl->expected_tpt[lq_sta->last_txrate_idx]);
3268 	else
3269 		desc += sprintf(buff+desc,
3270 				"Bit Rate= %d Mb/s\n",
3271 				iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3272 
3273 	return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3274 }
3275 
3276 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3277 	.read = rs_sta_dbgfs_rate_scale_data_read,
3278 	.open = simple_open,
3279 	.llseek = default_llseek,
3280 };
3281 
rs_add_debugfs(void * priv,void * priv_sta,struct dentry * dir)3282 static void rs_add_debugfs(void *priv, void *priv_sta,
3283 					struct dentry *dir)
3284 {
3285 	struct iwl_lq_sta *lq_sta = priv_sta;
3286 	lq_sta->rs_sta_dbgfs_scale_table_file =
3287 		debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3288 				lq_sta, &rs_sta_dbgfs_scale_table_ops);
3289 	lq_sta->rs_sta_dbgfs_stats_table_file =
3290 		debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3291 			lq_sta, &rs_sta_dbgfs_stats_table_ops);
3292 	lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3293 		debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3294 			lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3295 	lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3296 		debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3297 		&lq_sta->tx_agg_tid_en);
3298 
3299 }
3300 
rs_remove_debugfs(void * priv,void * priv_sta)3301 static void rs_remove_debugfs(void *priv, void *priv_sta)
3302 {
3303 	struct iwl_lq_sta *lq_sta = priv_sta;
3304 	debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3305 	debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3306 	debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3307 	debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3308 }
3309 #endif
3310 
3311 /*
3312  * Initialization of rate scaling information is done by driver after
3313  * the station is added. Since mac80211 calls this function before a
3314  * station is added we ignore it.
3315  */
rs_rate_init_stub(void * priv_r,struct ieee80211_supported_band * sband,struct cfg80211_chan_def * chandef,struct ieee80211_sta * sta,void * priv_sta)3316 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3317 			      struct cfg80211_chan_def *chandef,
3318 			      struct ieee80211_sta *sta, void *priv_sta)
3319 {
3320 }
3321 
3322 static const struct rate_control_ops rs_ops = {
3323 	.name = RS_NAME,
3324 	.tx_status = rs_tx_status,
3325 	.get_rate = rs_get_rate,
3326 	.rate_init = rs_rate_init_stub,
3327 	.alloc = rs_alloc,
3328 	.free = rs_free,
3329 	.alloc_sta = rs_alloc_sta,
3330 	.free_sta = rs_free_sta,
3331 #ifdef CONFIG_MAC80211_DEBUGFS
3332 	.add_sta_debugfs = rs_add_debugfs,
3333 	.remove_sta_debugfs = rs_remove_debugfs,
3334 #endif
3335 };
3336 
iwlagn_rate_control_register(void)3337 int iwlagn_rate_control_register(void)
3338 {
3339 	return ieee80211_rate_control_register(&rs_ops);
3340 }
3341 
iwlagn_rate_control_unregister(void)3342 void iwlagn_rate_control_unregister(void)
3343 {
3344 	ieee80211_rate_control_unregister(&rs_ops);
3345 }
3346 
3347