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b481de9c ZY |
1 | /****************************************************************************** |
2 | * | |
3 | * Copyright(c) 2005 - 2007 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 | * James P. Ketrenos <ipw2100-admin@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/init.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <linux/wireless.h> | |
30 | #include <net/mac80211.h> | |
31 | #include <net/ieee80211.h> | |
32 | ||
33 | #include <linux/netdevice.h> | |
34 | #include <linux/etherdevice.h> | |
35 | #include <linux/delay.h> | |
36 | ||
37 | #include <linux/workqueue.h> | |
38 | ||
b481de9c ZY |
39 | #include "../net/mac80211/ieee80211_rate.h" |
40 | ||
5d08cd1d | 41 | #include "iwl-4965.h" |
b481de9c ZY |
42 | #include "iwl-helpers.h" |
43 | ||
44 | #define RS_NAME "iwl-4965-rs" | |
45 | ||
46 | #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1 | |
47 | #define IWL_NUMBER_TRY 1 | |
48 | #define IWL_HT_NUMBER_TRY 3 | |
49 | ||
77626355 BC |
50 | #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ |
51 | #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ | |
52 | #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ | |
53 | ||
54 | /* max time to accum history 2 seconds */ | |
55 | #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ) | |
b481de9c ZY |
56 | |
57 | static u8 rs_ht_to_legacy[] = { | |
58 | IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, | |
59 | IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, | |
60 | IWL_RATE_6M_INDEX, | |
61 | IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX, | |
62 | IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX, | |
63 | IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX, | |
64 | IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX | |
65 | }; | |
66 | ||
bb8c093b | 67 | struct iwl4965_rate { |
b481de9c ZY |
68 | u32 rate_n_flags; |
69 | } __attribute__ ((packed)); | |
70 | ||
77626355 BC |
71 | /** |
72 | * struct iwl4965_rate_scale_data -- tx success history for one rate | |
73 | */ | |
bb8c093b | 74 | struct iwl4965_rate_scale_data { |
77626355 BC |
75 | u64 data; /* bitmap of successful frames */ |
76 | s32 success_counter; /* number of frames successful */ | |
77 | s32 success_ratio; /* per-cent * 128 */ | |
78 | s32 counter; /* number of frames attempted */ | |
79 | s32 average_tpt; /* success ratio * expected throughput */ | |
b481de9c ZY |
80 | unsigned long stamp; |
81 | }; | |
82 | ||
77626355 BC |
83 | /** |
84 | * struct iwl4965_scale_tbl_info -- tx params and success history for all rates | |
85 | * | |
86 | * There are two of these in struct iwl_rate_scale_priv, | |
87 | * one for "active", and one for "search". | |
88 | */ | |
bb8c093b CH |
89 | struct iwl4965_scale_tbl_info { |
90 | enum iwl4965_table_type lq_type; | |
91 | enum iwl4965_antenna_type antenna_type; | |
77626355 BC |
92 | u8 is_SGI; /* 1 = short guard interval */ |
93 | u8 is_fat; /* 1 = 40 MHz channel width */ | |
94 | u8 is_dup; /* 1 = duplicated data streams */ | |
95 | u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */ | |
96 | s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */ | |
97 | struct iwl4965_rate current_rate; /* rate_n_flags, uCode API format */ | |
98 | struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */ | |
b481de9c ZY |
99 | }; |
100 | ||
77626355 BC |
101 | /** |
102 | * struct iwl_rate_scale_priv -- driver's rate scaling private structure | |
103 | * | |
104 | * Pointer to this gets passed back and forth between driver and mac80211. | |
105 | */ | |
bb8c093b | 106 | struct iwl4965_rate_scale_priv { |
77626355 BC |
107 | u8 active_tbl; /* index of active table, range 0-1 */ |
108 | u8 enable_counter; /* indicates HT mode */ | |
109 | u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */ | |
110 | u8 search_better_tbl; /* 1: currently trying alternate mode */ | |
b481de9c | 111 | s32 last_tpt; |
77626355 BC |
112 | |
113 | /* The following determine when to search for a new mode */ | |
b481de9c | 114 | u32 table_count_limit; |
77626355 BC |
115 | u32 max_failure_limit; /* # failed frames before new search */ |
116 | u32 max_success_limit; /* # successful frames before new search */ | |
b481de9c | 117 | u32 table_count; |
77626355 BC |
118 | u32 total_failed; /* total failed frames, any/all rates */ |
119 | u32 total_success; /* total successful frames, any/all rates */ | |
120 | u32 flush_timer; /* time staying in mode before new search */ | |
121 | ||
122 | u8 action_counter; /* # mode-switch actions tried */ | |
b481de9c ZY |
123 | u8 antenna; |
124 | u8 valid_antenna; | |
125 | u8 is_green; | |
126 | u8 is_dup; | |
127 | u8 phymode; | |
128 | u8 ibss_sta_added; | |
77626355 BC |
129 | |
130 | /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */ | |
02dede04 | 131 | u32 supp_rates; |
b481de9c ZY |
132 | u16 active_rate; |
133 | u16 active_siso_rate; | |
134 | u16 active_mimo_rate; | |
135 | u16 active_rate_basic; | |
77626355 | 136 | |
bb8c093b | 137 | struct iwl4965_link_quality_cmd lq; |
77626355 | 138 | struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */ |
5ae212c9 | 139 | #ifdef CONFIG_MAC80211_DEBUGFS |
98d7e09a | 140 | struct dentry *rs_sta_dbgfs_scale_table_file; |
0209dc11 | 141 | struct dentry *rs_sta_dbgfs_stats_table_file; |
bb8c093b CH |
142 | struct iwl4965_rate dbg_fixed; |
143 | struct iwl4965_priv *drv; | |
5ae212c9 | 144 | #endif |
b481de9c ZY |
145 | }; |
146 | ||
bb8c093b | 147 | static void rs_rate_scale_perform(struct iwl4965_priv *priv, |
b481de9c ZY |
148 | struct net_device *dev, |
149 | struct ieee80211_hdr *hdr, | |
150 | struct sta_info *sta); | |
bb8c093b CH |
151 | static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data, |
152 | struct iwl4965_rate *tx_mcs, | |
153 | struct iwl4965_link_quality_cmd *tbl); | |
b481de9c ZY |
154 | |
155 | ||
98d7e09a | 156 | #ifdef CONFIG_MAC80211_DEBUGFS |
bb8c093b CH |
157 | static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv, |
158 | struct iwl4965_rate *mcs, int index); | |
98d7e09a | 159 | #else |
bb8c093b CH |
160 | static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv, |
161 | struct iwl4965_rate *mcs, int index) | |
98d7e09a ZY |
162 | {} |
163 | #endif | |
77626355 BC |
164 | |
165 | /* | |
166 | * Expected throughput metrics for following rates: | |
167 | * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits | |
168 | * "G" is the only table that supports CCK (the first 4 rates). | |
169 | */ | |
b481de9c ZY |
170 | static s32 expected_tpt_A[IWL_RATE_COUNT] = { |
171 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186 | |
172 | }; | |
173 | ||
174 | static s32 expected_tpt_G[IWL_RATE_COUNT] = { | |
175 | 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186 | |
176 | }; | |
177 | ||
178 | static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = { | |
179 | 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202 | |
180 | }; | |
181 | ||
182 | static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = { | |
183 | 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211 | |
184 | }; | |
185 | ||
186 | static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = { | |
187 | 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251 | |
188 | }; | |
189 | ||
190 | static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = { | |
191 | 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257 | |
192 | }; | |
193 | ||
194 | static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = { | |
195 | 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257 | |
196 | }; | |
197 | ||
198 | static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = { | |
199 | 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264 | |
200 | }; | |
201 | ||
202 | static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = { | |
203 | 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289 | |
204 | }; | |
205 | ||
206 | static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = { | |
207 | 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293 | |
208 | }; | |
209 | ||
bb8c093b CH |
210 | static int iwl4965_lq_sync_callback(struct iwl4965_priv *priv, |
211 | struct iwl4965_cmd *cmd, struct sk_buff *skb) | |
b481de9c ZY |
212 | { |
213 | /*We didn't cache the SKB; let the caller free it */ | |
214 | return 1; | |
215 | } | |
216 | ||
bb8c093b | 217 | static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags) |
b481de9c ZY |
218 | { |
219 | return (u8)(rate_n_flags & 0xFF); | |
220 | } | |
221 | ||
bb8c093b CH |
222 | static int rs_send_lq_cmd(struct iwl4965_priv *priv, |
223 | struct iwl4965_link_quality_cmd *lq, u8 flags) | |
b481de9c | 224 | { |
c8b0e6e1 | 225 | #ifdef CONFIG_IWL4965_DEBUG |
b481de9c ZY |
226 | int i; |
227 | #endif | |
bb8c093b | 228 | struct iwl4965_host_cmd cmd = { |
b481de9c | 229 | .id = REPLY_TX_LINK_QUALITY_CMD, |
bb8c093b | 230 | .len = sizeof(struct iwl4965_link_quality_cmd), |
b481de9c ZY |
231 | .meta.flags = flags, |
232 | .data = lq, | |
233 | }; | |
234 | ||
235 | if ((lq->sta_id == 0xFF) && | |
236 | (priv->iw_mode == IEEE80211_IF_TYPE_IBSS)) | |
dc2453ae | 237 | return -EINVAL; |
b481de9c ZY |
238 | |
239 | if (lq->sta_id == 0xFF) | |
240 | lq->sta_id = IWL_AP_ID; | |
241 | ||
242 | IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id); | |
243 | IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n", | |
244 | lq->general_params.single_stream_ant_msk, | |
245 | lq->general_params.dual_stream_ant_msk); | |
c8b0e6e1 | 246 | #ifdef CONFIG_IWL4965_DEBUG |
b481de9c ZY |
247 | for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) |
248 | IWL_DEBUG_RATE("lq index %d 0x%X\n", | |
249 | i, lq->rs_table[i].rate_n_flags); | |
250 | #endif | |
251 | ||
252 | if (flags & CMD_ASYNC) | |
bb8c093b | 253 | cmd.meta.u.callback = iwl4965_lq_sync_callback; |
b481de9c | 254 | |
bb8c093b | 255 | if (iwl4965_is_associated(priv) && priv->assoc_station_added && |
b481de9c | 256 | priv->lq_mngr.lq_ready) |
bb8c093b | 257 | return iwl4965_send_cmd(priv, &cmd); |
b481de9c | 258 | |
dc2453ae | 259 | return 0; |
b481de9c ZY |
260 | } |
261 | ||
bb8c093b | 262 | static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window) |
b481de9c ZY |
263 | { |
264 | window->data = 0; | |
265 | window->success_counter = 0; | |
266 | window->success_ratio = IWL_INVALID_VALUE; | |
267 | window->counter = 0; | |
268 | window->average_tpt = IWL_INVALID_VALUE; | |
269 | window->stamp = 0; | |
b481de9c ZY |
270 | } |
271 | ||
77626355 BC |
272 | /** |
273 | * rs_collect_tx_data - Update the success/failure sliding window | |
274 | * | |
275 | * We keep a sliding window of the last 62 packets transmitted | |
276 | * at this rate. window->data contains the bitmask of successful | |
277 | * packets. | |
278 | */ | |
bb8c093b | 279 | static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows, |
b481de9c ZY |
280 | int scale_index, s32 tpt, u32 status) |
281 | { | |
bb8c093b | 282 | struct iwl4965_rate_scale_data *window = NULL; |
b481de9c ZY |
283 | u64 mask; |
284 | u8 win_size = IWL_RATE_MAX_WINDOW; | |
285 | s32 fail_count; | |
286 | ||
dc2453ae TW |
287 | if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) |
288 | return -EINVAL; | |
b481de9c | 289 | |
77626355 | 290 | /* Select data for current tx bit rate */ |
b481de9c ZY |
291 | window = &(windows[scale_index]); |
292 | ||
77626355 BC |
293 | /* |
294 | * Keep track of only the latest 62 tx frame attempts in this rate's | |
295 | * history window; anything older isn't really relevant any more. | |
296 | * If we have filled up the sliding window, drop the oldest attempt; | |
297 | * if the oldest attempt (highest bit in bitmap) shows "success", | |
298 | * subtract "1" from the success counter (this is the main reason | |
299 | * we keep these bitmaps!). | |
300 | */ | |
b481de9c | 301 | if (window->counter >= win_size) { |
b481de9c ZY |
302 | window->counter = win_size - 1; |
303 | mask = 1; | |
304 | mask = (mask << (win_size - 1)); | |
305 | if ((window->data & mask)) { | |
306 | window->data &= ~mask; | |
307 | window->success_counter = window->success_counter - 1; | |
308 | } | |
309 | } | |
310 | ||
77626355 | 311 | /* Increment frames-attempted counter */ |
b481de9c | 312 | window->counter = window->counter + 1; |
77626355 BC |
313 | |
314 | /* Shift bitmap by one frame (throw away oldest history), | |
315 | * OR in "1", and increment "success" if this frame was successful. */ | |
b481de9c ZY |
316 | mask = window->data; |
317 | window->data = (mask << 1); | |
318 | if (status != 0) { | |
319 | window->success_counter = window->success_counter + 1; | |
320 | window->data |= 0x1; | |
321 | } | |
322 | ||
77626355 | 323 | /* Calculate current success ratio, avoid divide-by-0! */ |
b481de9c ZY |
324 | if (window->counter > 0) |
325 | window->success_ratio = 128 * (100 * window->success_counter) | |
326 | / window->counter; | |
327 | else | |
328 | window->success_ratio = IWL_INVALID_VALUE; | |
329 | ||
330 | fail_count = window->counter - window->success_counter; | |
331 | ||
77626355 | 332 | /* Calculate average throughput, if we have enough history. */ |
b481de9c ZY |
333 | if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || |
334 | (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) | |
335 | window->average_tpt = (window->success_ratio * tpt + 64) / 128; | |
336 | else | |
337 | window->average_tpt = IWL_INVALID_VALUE; | |
338 | ||
77626355 | 339 | /* Tag this window as having been updated */ |
b481de9c ZY |
340 | window->stamp = jiffies; |
341 | ||
dc2453ae | 342 | return 0; |
b481de9c ZY |
343 | } |
344 | ||
77626355 BC |
345 | /* |
346 | * Fill uCode API rate_n_flags field, based on "search" or "active" table. | |
347 | */ | |
bb8c093b CH |
348 | static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate, |
349 | struct iwl4965_scale_tbl_info *tbl, | |
b481de9c ZY |
350 | int index, u8 use_green) |
351 | { | |
b481de9c | 352 | if (is_legacy(tbl->lq_type)) { |
bb8c093b | 353 | mcs_rate->rate_n_flags = iwl4965_rates[index].plcp; |
b481de9c ZY |
354 | if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) |
355 | mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK; | |
356 | ||
357 | } else if (is_siso(tbl->lq_type)) { | |
358 | if (index > IWL_LAST_OFDM_RATE) | |
359 | index = IWL_LAST_OFDM_RATE; | |
bb8c093b | 360 | mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso | |
b481de9c ZY |
361 | RATE_MCS_HT_MSK; |
362 | } else { | |
363 | if (index > IWL_LAST_OFDM_RATE) | |
364 | index = IWL_LAST_OFDM_RATE; | |
bb8c093b | 365 | mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo | |
b481de9c ZY |
366 | RATE_MCS_HT_MSK; |
367 | } | |
368 | ||
369 | switch (tbl->antenna_type) { | |
370 | case ANT_BOTH: | |
371 | mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK; | |
372 | break; | |
373 | case ANT_MAIN: | |
374 | mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK; | |
375 | break; | |
376 | case ANT_AUX: | |
377 | mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK; | |
378 | break; | |
379 | case ANT_NONE: | |
380 | break; | |
381 | } | |
382 | ||
383 | if (is_legacy(tbl->lq_type)) | |
dc2453ae | 384 | return; |
b481de9c ZY |
385 | |
386 | if (tbl->is_fat) { | |
387 | if (tbl->is_dup) | |
388 | mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK; | |
389 | else | |
390 | mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK; | |
391 | } | |
392 | if (tbl->is_SGI) | |
393 | mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK; | |
394 | ||
395 | if (use_green) { | |
396 | mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK; | |
397 | if (is_siso(tbl->lq_type)) | |
398 | mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK; | |
399 | } | |
b481de9c ZY |
400 | } |
401 | ||
77626355 BC |
402 | /* |
403 | * Interpret uCode API's rate_n_flags format, | |
404 | * fill "search" or "active" tx mode table. | |
405 | */ | |
bb8c093b CH |
406 | static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate, |
407 | int phymode, struct iwl4965_scale_tbl_info *tbl, | |
b481de9c ZY |
408 | int *rate_idx) |
409 | { | |
410 | int index; | |
411 | u32 ant_msk; | |
412 | ||
bb8c093b | 413 | index = iwl4965_rate_index_from_plcp(mcs_rate->rate_n_flags); |
b481de9c ZY |
414 | |
415 | if (index == IWL_RATE_INVALID) { | |
416 | *rate_idx = -1; | |
dc2453ae | 417 | return -EINVAL; |
b481de9c | 418 | } |
77626355 | 419 | tbl->is_SGI = 0; /* default legacy setup */ |
b481de9c ZY |
420 | tbl->is_fat = 0; |
421 | tbl->is_dup = 0; | |
77626355 | 422 | tbl->antenna_type = ANT_BOTH; /* default MIMO setup */ |
b481de9c | 423 | |
77626355 | 424 | /* legacy rate format */ |
b481de9c ZY |
425 | if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) { |
426 | ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK); | |
427 | ||
428 | if (ant_msk == RATE_MCS_ANT_AB_MSK) | |
429 | tbl->lq_type = LQ_NONE; | |
430 | else { | |
431 | ||
432 | if (phymode == MODE_IEEE80211A) | |
433 | tbl->lq_type = LQ_A; | |
434 | else | |
435 | tbl->lq_type = LQ_G; | |
436 | ||
437 | if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK) | |
438 | tbl->antenna_type = ANT_MAIN; | |
439 | else | |
440 | tbl->antenna_type = ANT_AUX; | |
441 | } | |
442 | *rate_idx = index; | |
443 | ||
77626355 | 444 | /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */ |
bb8c093b | 445 | } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags) |
b481de9c ZY |
446 | <= IWL_RATE_SISO_60M_PLCP) { |
447 | tbl->lq_type = LQ_SISO; | |
448 | ||
449 | ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK); | |
450 | if (ant_msk == RATE_MCS_ANT_AB_MSK) | |
451 | tbl->lq_type = LQ_NONE; | |
452 | else { | |
453 | if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK) | |
454 | tbl->antenna_type = ANT_MAIN; | |
455 | else | |
456 | tbl->antenna_type = ANT_AUX; | |
457 | } | |
458 | if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK) | |
459 | tbl->is_SGI = 1; | |
460 | ||
461 | if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) || | |
462 | (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)) | |
463 | tbl->is_fat = 1; | |
464 | ||
465 | if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK) | |
466 | tbl->is_dup = 1; | |
467 | ||
468 | *rate_idx = index; | |
77626355 BC |
469 | |
470 | /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */ | |
b481de9c ZY |
471 | } else { |
472 | tbl->lq_type = LQ_MIMO; | |
473 | if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK) | |
474 | tbl->is_SGI = 1; | |
475 | ||
476 | if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) || | |
477 | (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)) | |
478 | tbl->is_fat = 1; | |
479 | ||
480 | if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK) | |
481 | tbl->is_dup = 1; | |
482 | *rate_idx = index; | |
483 | } | |
484 | return 0; | |
485 | } | |
486 | ||
bb8c093b CH |
487 | static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate, |
488 | struct iwl4965_scale_tbl_info *tbl) | |
b481de9c ZY |
489 | { |
490 | if (tbl->antenna_type == ANT_AUX) { | |
491 | tbl->antenna_type = ANT_MAIN; | |
492 | new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK; | |
493 | new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK; | |
494 | } else { | |
495 | tbl->antenna_type = ANT_AUX; | |
496 | new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK; | |
497 | new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK; | |
498 | } | |
499 | } | |
500 | ||
270243a5 RR |
501 | static inline u8 rs_use_green(struct iwl4965_priv *priv, |
502 | struct ieee80211_conf *conf) | |
b481de9c | 503 | { |
c8b0e6e1 | 504 | #ifdef CONFIG_IWL4965_HT |
270243a5 RR |
505 | return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) && |
506 | priv->current_ht_config.is_green_field && | |
507 | !priv->current_ht_config.non_GF_STA_present); | |
508 | #endif /* CONFIG_IWL4965_HT */ | |
dc2453ae | 509 | return 0; |
b481de9c ZY |
510 | } |
511 | ||
512 | /** | |
513 | * rs_get_supported_rates - get the available rates | |
514 | * | |
515 | * if management frame or broadcast frame only return | |
516 | * basic available rates. | |
517 | * | |
518 | */ | |
bb8c093b | 519 | static void rs_get_supported_rates(struct iwl4965_rate_scale_priv *lq_data, |
b481de9c | 520 | struct ieee80211_hdr *hdr, |
bb8c093b | 521 | enum iwl4965_table_type rate_type, |
b481de9c ZY |
522 | u16 *data_rate) |
523 | { | |
524 | if (is_legacy(rate_type)) | |
525 | *data_rate = lq_data->active_rate; | |
526 | else { | |
527 | if (is_siso(rate_type)) | |
528 | *data_rate = lq_data->active_siso_rate; | |
529 | else | |
530 | *data_rate = lq_data->active_mimo_rate; | |
531 | } | |
532 | ||
533 | if (hdr && is_multicast_ether_addr(hdr->addr1) && | |
534 | lq_data->active_rate_basic) | |
535 | *data_rate = lq_data->active_rate_basic; | |
536 | } | |
537 | ||
538 | static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type) | |
539 | { | |
540 | u8 high = IWL_RATE_INVALID; | |
541 | u8 low = IWL_RATE_INVALID; | |
542 | ||
01ebd063 | 543 | /* 802.11A or ht walks to the next literal adjacent rate in |
b481de9c ZY |
544 | * the rate table */ |
545 | if (is_a_band(rate_type) || !is_legacy(rate_type)) { | |
546 | int i; | |
547 | u32 mask; | |
548 | ||
549 | /* Find the previous rate that is in the rate mask */ | |
550 | i = index - 1; | |
551 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
552 | if (rate_mask & mask) { | |
553 | low = i; | |
554 | break; | |
555 | } | |
556 | } | |
557 | ||
558 | /* Find the next rate that is in the rate mask */ | |
559 | i = index + 1; | |
560 | for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { | |
561 | if (rate_mask & mask) { | |
562 | high = i; | |
563 | break; | |
564 | } | |
565 | } | |
566 | ||
567 | return (high << 8) | low; | |
568 | } | |
569 | ||
570 | low = index; | |
571 | while (low != IWL_RATE_INVALID) { | |
bb8c093b | 572 | low = iwl4965_rates[low].prev_rs; |
b481de9c ZY |
573 | if (low == IWL_RATE_INVALID) |
574 | break; | |
575 | if (rate_mask & (1 << low)) | |
576 | break; | |
577 | IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low); | |
578 | } | |
579 | ||
580 | high = index; | |
581 | while (high != IWL_RATE_INVALID) { | |
bb8c093b | 582 | high = iwl4965_rates[high].next_rs; |
b481de9c ZY |
583 | if (high == IWL_RATE_INVALID) |
584 | break; | |
585 | if (rate_mask & (1 << high)) | |
586 | break; | |
587 | IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high); | |
588 | } | |
589 | ||
590 | return (high << 8) | low; | |
591 | } | |
592 | ||
bb8c093b CH |
593 | static void rs_get_lower_rate(struct iwl4965_rate_scale_priv *lq_data, |
594 | struct iwl4965_scale_tbl_info *tbl, u8 scale_index, | |
595 | u8 ht_possible, struct iwl4965_rate *mcs_rate) | |
b481de9c | 596 | { |
b481de9c ZY |
597 | s32 low; |
598 | u16 rate_mask; | |
599 | u16 high_low; | |
600 | u8 switch_to_legacy = 0; | |
02dede04 | 601 | u8 is_green = lq_data->is_green; |
b481de9c ZY |
602 | |
603 | /* check if we need to switch from HT to legacy rates. | |
604 | * assumption is that mandatory rates (1Mbps or 6Mbps) | |
605 | * are always supported (spec demand) */ | |
606 | if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) { | |
607 | switch_to_legacy = 1; | |
608 | scale_index = rs_ht_to_legacy[scale_index]; | |
609 | if (lq_data->phymode == MODE_IEEE80211A) | |
610 | tbl->lq_type = LQ_A; | |
611 | else | |
612 | tbl->lq_type = LQ_G; | |
613 | ||
614 | if ((tbl->antenna_type == ANT_BOTH) || | |
615 | (tbl->antenna_type == ANT_NONE)) | |
616 | tbl->antenna_type = ANT_MAIN; | |
617 | ||
618 | tbl->is_fat = 0; | |
619 | tbl->is_SGI = 0; | |
620 | } | |
621 | ||
622 | rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask); | |
623 | ||
77626355 | 624 | /* Mask with station rate restriction */ |
b481de9c | 625 | if (is_legacy(tbl->lq_type)) { |
77626355 | 626 | /* supp_rates has no CCK bits in A mode */ |
b481de9c ZY |
627 | if (lq_data->phymode == (u8) MODE_IEEE80211A) |
628 | rate_mask = (u16)(rate_mask & | |
02dede04 | 629 | (lq_data->supp_rates << IWL_FIRST_OFDM_RATE)); |
b481de9c | 630 | else |
02dede04 | 631 | rate_mask = (u16)(rate_mask & lq_data->supp_rates); |
b481de9c ZY |
632 | } |
633 | ||
77626355 | 634 | /* If we switched from HT to legacy, check current rate */ |
dc2453ae | 635 | if (switch_to_legacy && (rate_mask & (1 << scale_index))) { |
b481de9c | 636 | rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green); |
dc2453ae | 637 | return; |
b481de9c ZY |
638 | } |
639 | ||
640 | high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type); | |
641 | low = high_low & 0xff; | |
642 | ||
643 | if (low != IWL_RATE_INVALID) | |
644 | rs_mcs_from_tbl(mcs_rate, tbl, low, is_green); | |
645 | else | |
646 | rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green); | |
b481de9c ZY |
647 | } |
648 | ||
77626355 BC |
649 | /* |
650 | * mac80211 sends us Tx status | |
651 | */ | |
b481de9c ZY |
652 | static void rs_tx_status(void *priv_rate, |
653 | struct net_device *dev, | |
654 | struct sk_buff *skb, | |
655 | struct ieee80211_tx_status *tx_resp) | |
656 | { | |
657 | int status; | |
658 | u8 retries; | |
659 | int rs_index, index = 0; | |
bb8c093b CH |
660 | struct iwl4965_rate_scale_priv *lq; |
661 | struct iwl4965_link_quality_cmd *table; | |
b481de9c ZY |
662 | struct sta_info *sta; |
663 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
bb8c093b | 664 | struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate; |
b481de9c | 665 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
bb8c093b CH |
666 | struct iwl4965_rate_scale_data *window = NULL; |
667 | struct iwl4965_rate_scale_data *search_win = NULL; | |
668 | struct iwl4965_rate tx_mcs; | |
669 | struct iwl4965_scale_tbl_info tbl_type; | |
670 | struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl; | |
b481de9c ZY |
671 | u8 active_index = 0; |
672 | u16 fc = le16_to_cpu(hdr->frame_control); | |
673 | s32 tpt = 0; | |
674 | ||
58826351 | 675 | IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n"); |
b481de9c ZY |
676 | |
677 | if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) | |
678 | return; | |
679 | ||
680 | retries = tx_resp->retry_count; | |
681 | ||
682 | if (retries > 15) | |
683 | retries = 15; | |
684 | ||
685 | ||
686 | sta = sta_info_get(local, hdr->addr1); | |
687 | ||
688 | if (!sta || !sta->rate_ctrl_priv) { | |
689 | if (sta) | |
690 | sta_info_put(sta); | |
691 | return; | |
692 | } | |
693 | ||
bb8c093b | 694 | lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv; |
b481de9c ZY |
695 | |
696 | if (!priv->lq_mngr.lq_ready) | |
697 | return; | |
698 | ||
699 | if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) | |
700 | return; | |
701 | ||
702 | table = &lq->lq; | |
703 | active_index = lq->active_tbl; | |
704 | ||
77626355 | 705 | /* Get mac80211 antenna info */ |
b481de9c ZY |
706 | lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx); |
707 | if (!lq->antenna) | |
708 | lq->antenna = lq->valid_antenna; | |
709 | ||
77626355 | 710 | /* Ignore mac80211 antenna info for now */ |
b481de9c | 711 | lq->antenna = lq->valid_antenna; |
77626355 | 712 | |
b481de9c ZY |
713 | curr_tbl = &(lq->lq_info[active_index]); |
714 | search_tbl = &(lq->lq_info[(1 - active_index)]); | |
bb8c093b | 715 | window = (struct iwl4965_rate_scale_data *) |
b481de9c | 716 | &(curr_tbl->win[0]); |
bb8c093b | 717 | search_win = (struct iwl4965_rate_scale_data *) |
b481de9c ZY |
718 | &(search_tbl->win[0]); |
719 | ||
720 | tx_mcs.rate_n_flags = tx_resp->control.tx_rate; | |
721 | ||
722 | rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode, | |
723 | &tbl_type, &rs_index); | |
724 | if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) { | |
725 | IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n", | |
726 | rs_index, tx_mcs.rate_n_flags); | |
727 | sta_info_put(sta); | |
728 | return; | |
729 | } | |
730 | ||
77626355 BC |
731 | /* |
732 | * Ignore this Tx frame response if its initial rate doesn't match | |
733 | * that of latest Link Quality command. There may be stragglers | |
734 | * from a previous Link Quality command, but we're no longer interested | |
735 | * in those; they're either from the "active" mode while we're trying | |
736 | * to check "search" mode, or a prior "search" mode after we've moved | |
737 | * to a new "search" mode (which might become the new "active" mode). | |
738 | */ | |
b481de9c ZY |
739 | if (retries && |
740 | (tx_mcs.rate_n_flags != | |
741 | le32_to_cpu(table->rs_table[0].rate_n_flags))) { | |
742 | IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n", | |
743 | tx_mcs.rate_n_flags, | |
744 | le32_to_cpu(table->rs_table[0].rate_n_flags)); | |
745 | sta_info_put(sta); | |
746 | return; | |
747 | } | |
748 | ||
77626355 | 749 | /* Update frame history window with "failure" for each Tx retry. */ |
b481de9c | 750 | while (retries) { |
77626355 BC |
751 | /* Look up the rate and other info used for each tx attempt. |
752 | * Each tx attempt steps one entry deeper in the rate table. */ | |
b481de9c ZY |
753 | tx_mcs.rate_n_flags = |
754 | le32_to_cpu(table->rs_table[index].rate_n_flags); | |
755 | rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode, | |
756 | &tbl_type, &rs_index); | |
757 | ||
77626355 BC |
758 | /* If type matches "search" table, |
759 | * add failure to "search" history */ | |
b481de9c ZY |
760 | if ((tbl_type.lq_type == search_tbl->lq_type) && |
761 | (tbl_type.antenna_type == search_tbl->antenna_type) && | |
762 | (tbl_type.is_SGI == search_tbl->is_SGI)) { | |
763 | if (search_tbl->expected_tpt) | |
764 | tpt = search_tbl->expected_tpt[rs_index]; | |
765 | else | |
766 | tpt = 0; | |
77626355 BC |
767 | rs_collect_tx_data(search_win, rs_index, tpt, 0); |
768 | ||
769 | /* Else if type matches "current/active" table, | |
770 | * add failure to "current/active" history */ | |
b481de9c ZY |
771 | } else if ((tbl_type.lq_type == curr_tbl->lq_type) && |
772 | (tbl_type.antenna_type == curr_tbl->antenna_type) && | |
773 | (tbl_type.is_SGI == curr_tbl->is_SGI)) { | |
774 | if (curr_tbl->expected_tpt) | |
775 | tpt = curr_tbl->expected_tpt[rs_index]; | |
776 | else | |
777 | tpt = 0; | |
778 | rs_collect_tx_data(window, rs_index, tpt, 0); | |
779 | } | |
77626355 BC |
780 | |
781 | /* If not searching for a new mode, increment failed counter | |
782 | * ... this helps determine when to start searching again */ | |
b481de9c ZY |
783 | if (lq->stay_in_tbl) |
784 | lq->total_failed++; | |
785 | --retries; | |
786 | index++; | |
787 | ||
788 | } | |
789 | ||
77626355 BC |
790 | /* |
791 | * Find (by rate) the history window to update with final Tx attempt; | |
792 | * if Tx was successful first try, use original rate, | |
793 | * else look up the rate that was, finally, successful. | |
794 | */ | |
b481de9c ZY |
795 | if (!tx_resp->retry_count) |
796 | tx_mcs.rate_n_flags = tx_resp->control.tx_rate; | |
797 | else | |
798 | tx_mcs.rate_n_flags = | |
799 | le32_to_cpu(table->rs_table[index].rate_n_flags); | |
800 | ||
801 | rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode, | |
802 | &tbl_type, &rs_index); | |
803 | ||
77626355 | 804 | /* Update frame history window with "success" if Tx got ACKed ... */ |
b481de9c ZY |
805 | if (tx_resp->flags & IEEE80211_TX_STATUS_ACK) |
806 | status = 1; | |
807 | else | |
808 | status = 0; | |
809 | ||
77626355 BC |
810 | /* If type matches "search" table, |
811 | * add final tx status to "search" history */ | |
b481de9c ZY |
812 | if ((tbl_type.lq_type == search_tbl->lq_type) && |
813 | (tbl_type.antenna_type == search_tbl->antenna_type) && | |
814 | (tbl_type.is_SGI == search_tbl->is_SGI)) { | |
815 | if (search_tbl->expected_tpt) | |
816 | tpt = search_tbl->expected_tpt[rs_index]; | |
817 | else | |
818 | tpt = 0; | |
819 | rs_collect_tx_data(search_win, | |
820 | rs_index, tpt, status); | |
77626355 BC |
821 | |
822 | /* Else if type matches "current/active" table, | |
823 | * add final tx status to "current/active" history */ | |
b481de9c ZY |
824 | } else if ((tbl_type.lq_type == curr_tbl->lq_type) && |
825 | (tbl_type.antenna_type == curr_tbl->antenna_type) && | |
826 | (tbl_type.is_SGI == curr_tbl->is_SGI)) { | |
827 | if (curr_tbl->expected_tpt) | |
828 | tpt = curr_tbl->expected_tpt[rs_index]; | |
829 | else | |
830 | tpt = 0; | |
831 | rs_collect_tx_data(window, rs_index, tpt, status); | |
832 | } | |
833 | ||
77626355 BC |
834 | /* If not searching for new mode, increment success/failed counter |
835 | * ... these help determine when to start searching again */ | |
b481de9c ZY |
836 | if (lq->stay_in_tbl) { |
837 | if (status) | |
838 | lq->total_success++; | |
839 | else | |
840 | lq->total_failed++; | |
841 | } | |
842 | ||
77626355 | 843 | /* See if there's a better rate or modulation mode to try. */ |
b481de9c ZY |
844 | rs_rate_scale_perform(priv, dev, hdr, sta); |
845 | sta_info_put(sta); | |
846 | return; | |
847 | } | |
848 | ||
849 | static u8 rs_is_ant_connected(u8 valid_antenna, | |
bb8c093b | 850 | enum iwl4965_antenna_type antenna_type) |
b481de9c ZY |
851 | { |
852 | if (antenna_type == ANT_AUX) | |
853 | return ((valid_antenna & 0x2) ? 1:0); | |
854 | else if (antenna_type == ANT_MAIN) | |
855 | return ((valid_antenna & 0x1) ? 1:0); | |
dc2453ae TW |
856 | else if (antenna_type == ANT_BOTH) |
857 | return ((valid_antenna & 0x3) == 0x3); | |
b481de9c ZY |
858 | |
859 | return 1; | |
860 | } | |
861 | ||
862 | static u8 rs_is_other_ant_connected(u8 valid_antenna, | |
bb8c093b | 863 | enum iwl4965_antenna_type antenna_type) |
b481de9c ZY |
864 | { |
865 | if (antenna_type == ANT_AUX) | |
dc2453ae | 866 | return rs_is_ant_connected(valid_antenna, ANT_MAIN); |
b481de9c | 867 | else |
dc2453ae | 868 | return rs_is_ant_connected(valid_antenna, ANT_AUX); |
b481de9c ZY |
869 | |
870 | return 0; | |
871 | } | |
872 | ||
77626355 BC |
873 | /* |
874 | * Begin a period of staying with a selected modulation mode. | |
875 | * Set "stay_in_tbl" flag to prevent any mode switches. | |
876 | * Set frame tx success limits according to legacy vs. high-throughput, | |
877 | * and reset overall (spanning all rates) tx success history statistics. | |
878 | * These control how long we stay using same modulation mode before | |
879 | * searching for a new mode. | |
880 | */ | |
b481de9c | 881 | static void rs_set_stay_in_table(u8 is_legacy, |
bb8c093b | 882 | struct iwl4965_rate_scale_priv *lq_data) |
b481de9c ZY |
883 | { |
884 | IWL_DEBUG_HT("we are staying in the same table\n"); | |
77626355 | 885 | lq_data->stay_in_tbl = 1; /* only place this gets set */ |
b481de9c ZY |
886 | if (is_legacy) { |
887 | lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT; | |
888 | lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; | |
403ab56b | 889 | lq_data->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; |
b481de9c ZY |
890 | } else { |
891 | lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; | |
892 | lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; | |
893 | lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; | |
894 | } | |
895 | lq_data->table_count = 0; | |
896 | lq_data->total_failed = 0; | |
897 | lq_data->total_success = 0; | |
898 | } | |
899 | ||
77626355 BC |
900 | /* |
901 | * Find correct throughput table for given mode of modulation | |
902 | */ | |
bb8c093b CH |
903 | static void rs_get_expected_tpt_table(struct iwl4965_rate_scale_priv *lq_data, |
904 | struct iwl4965_scale_tbl_info *tbl) | |
b481de9c ZY |
905 | { |
906 | if (is_legacy(tbl->lq_type)) { | |
907 | if (!is_a_band(tbl->lq_type)) | |
908 | tbl->expected_tpt = expected_tpt_G; | |
909 | else | |
910 | tbl->expected_tpt = expected_tpt_A; | |
911 | } else if (is_siso(tbl->lq_type)) { | |
912 | if (tbl->is_fat && !lq_data->is_dup) | |
913 | if (tbl->is_SGI) | |
914 | tbl->expected_tpt = expected_tpt_siso40MHzSGI; | |
915 | else | |
916 | tbl->expected_tpt = expected_tpt_siso40MHz; | |
917 | else if (tbl->is_SGI) | |
918 | tbl->expected_tpt = expected_tpt_siso20MHzSGI; | |
919 | else | |
920 | tbl->expected_tpt = expected_tpt_siso20MHz; | |
921 | ||
922 | } else if (is_mimo(tbl->lq_type)) { | |
923 | if (tbl->is_fat && !lq_data->is_dup) | |
924 | if (tbl->is_SGI) | |
925 | tbl->expected_tpt = expected_tpt_mimo40MHzSGI; | |
926 | else | |
927 | tbl->expected_tpt = expected_tpt_mimo40MHz; | |
928 | else if (tbl->is_SGI) | |
929 | tbl->expected_tpt = expected_tpt_mimo20MHzSGI; | |
930 | else | |
931 | tbl->expected_tpt = expected_tpt_mimo20MHz; | |
932 | } else | |
933 | tbl->expected_tpt = expected_tpt_G; | |
934 | } | |
935 | ||
c8b0e6e1 | 936 | #ifdef CONFIG_IWL4965_HT |
77626355 BC |
937 | /* |
938 | * Find starting rate for new "search" high-throughput mode of modulation. | |
939 | * Goal is to find lowest expected rate (under perfect conditions) that is | |
940 | * above the current measured throughput of "active" mode, to give new mode | |
941 | * a fair chance to prove itself without too many challenges. | |
942 | * | |
943 | * This gets called when transitioning to more aggressive modulation | |
944 | * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive | |
945 | * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need | |
946 | * to decrease to match "active" throughput. When moving from MIMO to SISO, | |
947 | * bit rate will typically need to increase, but not if performance was bad. | |
948 | */ | |
bb8c093b CH |
949 | static s32 rs_get_best_rate(struct iwl4965_priv *priv, |
950 | struct iwl4965_rate_scale_priv *lq_data, | |
77626355 | 951 | struct iwl4965_scale_tbl_info *tbl, /* "search" */ |
b481de9c ZY |
952 | u16 rate_mask, s8 index, s8 rate) |
953 | { | |
77626355 | 954 | /* "active" values */ |
bb8c093b | 955 | struct iwl4965_scale_tbl_info *active_tbl = |
b481de9c | 956 | &(lq_data->lq_info[lq_data->active_tbl]); |
b481de9c | 957 | s32 active_sr = active_tbl->win[index].success_ratio; |
b481de9c | 958 | s32 active_tpt = active_tbl->expected_tpt[index]; |
77626355 BC |
959 | |
960 | /* expected "search" throughput */ | |
961 | s32 *tpt_tbl = tbl->expected_tpt; | |
962 | ||
963 | s32 new_rate, high, low, start_hi; | |
b481de9c ZY |
964 | u16 high_low; |
965 | ||
966 | new_rate = high = low = start_hi = IWL_RATE_INVALID; | |
967 | ||
968 | for (; ;) { | |
969 | high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type); | |
970 | ||
971 | low = high_low & 0xff; | |
972 | high = (high_low >> 8) & 0xff; | |
973 | ||
77626355 BC |
974 | /* |
975 | * Lower the "search" bit rate, to give new "search" mode | |
976 | * approximately the same throughput as "active" if: | |
977 | * | |
978 | * 1) "Active" mode has been working modestly well (but not | |
979 | * great), and expected "search" throughput (under perfect | |
980 | * conditions) at candidate rate is above the actual | |
981 | * measured "active" throughput (but less than expected | |
982 | * "active" throughput under perfect conditions). | |
983 | * OR | |
984 | * 2) "Active" mode has been working perfectly or very well | |
985 | * and expected "search" throughput (under perfect | |
986 | * conditions) at candidate rate is above expected | |
987 | * "active" throughput (under perfect conditions). | |
988 | */ | |
b481de9c ZY |
989 | if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) && |
990 | ((active_sr > IWL_RATE_DECREASE_TH) && | |
991 | (active_sr <= IWL_RATE_HIGH_TH) && | |
992 | (tpt_tbl[rate] <= active_tpt))) || | |
993 | ((active_sr >= IWL_RATE_SCALE_SWITCH) && | |
994 | (tpt_tbl[rate] > active_tpt))) { | |
995 | ||
77626355 BC |
996 | /* (2nd or later pass) |
997 | * If we've already tried to raise the rate, and are | |
998 | * now trying to lower it, use the higher rate. */ | |
b481de9c ZY |
999 | if (start_hi != IWL_RATE_INVALID) { |
1000 | new_rate = start_hi; | |
1001 | break; | |
1002 | } | |
77626355 | 1003 | |
b481de9c | 1004 | new_rate = rate; |
77626355 BC |
1005 | |
1006 | /* Loop again with lower rate */ | |
b481de9c ZY |
1007 | if (low != IWL_RATE_INVALID) |
1008 | rate = low; | |
77626355 BC |
1009 | |
1010 | /* Lower rate not available, use the original */ | |
b481de9c ZY |
1011 | else |
1012 | break; | |
77626355 BC |
1013 | |
1014 | /* Else try to raise the "search" rate to match "active" */ | |
b481de9c | 1015 | } else { |
77626355 BC |
1016 | /* (2nd or later pass) |
1017 | * If we've already tried to lower the rate, and are | |
1018 | * now trying to raise it, use the lower rate. */ | |
b481de9c ZY |
1019 | if (new_rate != IWL_RATE_INVALID) |
1020 | break; | |
77626355 BC |
1021 | |
1022 | /* Loop again with higher rate */ | |
b481de9c ZY |
1023 | else if (high != IWL_RATE_INVALID) { |
1024 | start_hi = high; | |
1025 | rate = high; | |
77626355 BC |
1026 | |
1027 | /* Higher rate not available, use the original */ | |
b481de9c ZY |
1028 | } else { |
1029 | new_rate = rate; | |
1030 | break; | |
1031 | } | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | return new_rate; | |
1036 | } | |
c8b0e6e1 | 1037 | #endif /* CONFIG_IWL4965_HT */ |
b481de9c ZY |
1038 | |
1039 | static inline u8 rs_is_both_ant_supp(u8 valid_antenna) | |
1040 | { | |
1041 | return (rs_is_ant_connected(valid_antenna, ANT_BOTH)); | |
1042 | } | |
1043 | ||
77626355 BC |
1044 | /* |
1045 | * Set up search table for MIMO | |
1046 | */ | |
bb8c093b CH |
1047 | static int rs_switch_to_mimo(struct iwl4965_priv *priv, |
1048 | struct iwl4965_rate_scale_priv *lq_data, | |
270243a5 RR |
1049 | struct ieee80211_conf *conf, |
1050 | struct sta_info *sta, | |
bb8c093b | 1051 | struct iwl4965_scale_tbl_info *tbl, int index) |
b481de9c | 1052 | { |
c8b0e6e1 | 1053 | #ifdef CONFIG_IWL4965_HT |
b481de9c ZY |
1054 | u16 rate_mask; |
1055 | s32 rate; | |
1056 | s8 is_green = lq_data->is_green; | |
1057 | ||
270243a5 RR |
1058 | if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) || |
1059 | !sta->ht_info.ht_supported) | |
b481de9c ZY |
1060 | return -1; |
1061 | ||
1062 | IWL_DEBUG_HT("LQ: try to switch to MIMO\n"); | |
1063 | tbl->lq_type = LQ_MIMO; | |
1064 | rs_get_supported_rates(lq_data, NULL, tbl->lq_type, | |
1065 | &rate_mask); | |
1066 | ||
270243a5 | 1067 | if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC) |
b481de9c ZY |
1068 | return -1; |
1069 | ||
77626355 | 1070 | /* Need both Tx chains/antennas to support MIMO */ |
b481de9c ZY |
1071 | if (!rs_is_both_ant_supp(lq_data->antenna)) |
1072 | return -1; | |
1073 | ||
b481de9c ZY |
1074 | tbl->is_dup = lq_data->is_dup; |
1075 | tbl->action = 0; | |
270243a5 RR |
1076 | if (priv->current_ht_config.supported_chan_width |
1077 | == IWL_CHANNEL_WIDTH_40MHZ) | |
b481de9c ZY |
1078 | tbl->is_fat = 1; |
1079 | else | |
1080 | tbl->is_fat = 0; | |
1081 | ||
1082 | if (tbl->is_fat) { | |
270243a5 | 1083 | if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY) |
b481de9c ZY |
1084 | tbl->is_SGI = 1; |
1085 | else | |
1086 | tbl->is_SGI = 0; | |
270243a5 | 1087 | } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY) |
b481de9c ZY |
1088 | tbl->is_SGI = 1; |
1089 | else | |
1090 | tbl->is_SGI = 0; | |
1091 | ||
1092 | rs_get_expected_tpt_table(lq_data, tbl); | |
1093 | ||
1094 | rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index); | |
1095 | ||
1096 | IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask); | |
1097 | if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) | |
1098 | return -1; | |
1099 | rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green); | |
1100 | ||
1101 | IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n", | |
1102 | tbl->current_rate.rate_n_flags, is_green); | |
dc2453ae | 1103 | return 0; |
403ab56b MA |
1104 | #else |
1105 | return -1; | |
1106 | #endif /*CONFIG_IWL4965_HT */ | |
b481de9c ZY |
1107 | } |
1108 | ||
77626355 BC |
1109 | /* |
1110 | * Set up search table for SISO | |
1111 | */ | |
bb8c093b CH |
1112 | static int rs_switch_to_siso(struct iwl4965_priv *priv, |
1113 | struct iwl4965_rate_scale_priv *lq_data, | |
270243a5 RR |
1114 | struct ieee80211_conf *conf, |
1115 | struct sta_info *sta, | |
bb8c093b | 1116 | struct iwl4965_scale_tbl_info *tbl, int index) |
b481de9c | 1117 | { |
c8b0e6e1 | 1118 | #ifdef CONFIG_IWL4965_HT |
b481de9c ZY |
1119 | u16 rate_mask; |
1120 | u8 is_green = lq_data->is_green; | |
1121 | s32 rate; | |
1122 | ||
1123 | IWL_DEBUG_HT("LQ: try to switch to SISO\n"); | |
270243a5 RR |
1124 | if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) || |
1125 | !sta->ht_info.ht_supported) | |
b481de9c ZY |
1126 | return -1; |
1127 | ||
b481de9c ZY |
1128 | tbl->is_dup = lq_data->is_dup; |
1129 | tbl->lq_type = LQ_SISO; | |
1130 | tbl->action = 0; | |
1131 | rs_get_supported_rates(lq_data, NULL, tbl->lq_type, | |
1132 | &rate_mask); | |
1133 | ||
270243a5 RR |
1134 | if (priv->current_ht_config.supported_chan_width |
1135 | == IWL_CHANNEL_WIDTH_40MHZ) | |
b481de9c ZY |
1136 | tbl->is_fat = 1; |
1137 | else | |
1138 | tbl->is_fat = 0; | |
1139 | ||
1140 | if (tbl->is_fat) { | |
270243a5 | 1141 | if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY) |
b481de9c ZY |
1142 | tbl->is_SGI = 1; |
1143 | else | |
1144 | tbl->is_SGI = 0; | |
270243a5 | 1145 | } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY) |
b481de9c ZY |
1146 | tbl->is_SGI = 1; |
1147 | else | |
1148 | tbl->is_SGI = 0; | |
1149 | ||
1150 | if (is_green) | |
1151 | tbl->is_SGI = 0; | |
1152 | ||
1153 | rs_get_expected_tpt_table(lq_data, tbl); | |
1154 | rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index); | |
1155 | ||
1156 | IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask); | |
1157 | if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { | |
1158 | IWL_DEBUG_HT("can not switch with index %d rate mask %x\n", | |
1159 | rate, rate_mask); | |
1160 | return -1; | |
1161 | } | |
1162 | rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green); | |
1163 | IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n", | |
1164 | tbl->current_rate.rate_n_flags, is_green); | |
403ab56b MA |
1165 | return 0; |
1166 | #else | |
1167 | return -1; | |
b481de9c | 1168 | |
c8b0e6e1 | 1169 | #endif /*CONFIG_IWL4965_HT */ |
b481de9c ZY |
1170 | } |
1171 | ||
77626355 BC |
1172 | /* |
1173 | * Try to switch to new modulation mode from legacy | |
1174 | */ | |
bb8c093b CH |
1175 | static int rs_move_legacy_other(struct iwl4965_priv *priv, |
1176 | struct iwl4965_rate_scale_priv *lq_data, | |
270243a5 RR |
1177 | struct ieee80211_conf *conf, |
1178 | struct sta_info *sta, | |
b481de9c ZY |
1179 | int index) |
1180 | { | |
dc2453ae | 1181 | int ret = 0; |
bb8c093b | 1182 | struct iwl4965_scale_tbl_info *tbl = |
b481de9c | 1183 | &(lq_data->lq_info[lq_data->active_tbl]); |
bb8c093b | 1184 | struct iwl4965_scale_tbl_info *search_tbl = |
b481de9c | 1185 | &(lq_data->lq_info[(1 - lq_data->active_tbl)]); |
bb8c093b CH |
1186 | struct iwl4965_rate_scale_data *window = &(tbl->win[index]); |
1187 | u32 sz = (sizeof(struct iwl4965_scale_tbl_info) - | |
1188 | (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT)); | |
b481de9c ZY |
1189 | u8 start_action = tbl->action; |
1190 | ||
1191 | for (; ;) { | |
1192 | switch (tbl->action) { | |
1193 | case IWL_LEGACY_SWITCH_ANTENNA: | |
1194 | IWL_DEBUG_HT("LQ Legacy switch Antenna\n"); | |
1195 | ||
1196 | search_tbl->lq_type = LQ_NONE; | |
1197 | lq_data->action_counter++; | |
77626355 BC |
1198 | |
1199 | /* Don't change antenna if success has been great */ | |
b481de9c ZY |
1200 | if (window->success_ratio >= IWL_RS_GOOD_RATIO) |
1201 | break; | |
77626355 BC |
1202 | |
1203 | /* Don't change antenna if other one is not connected */ | |
b481de9c ZY |
1204 | if (!rs_is_other_ant_connected(lq_data->antenna, |
1205 | tbl->antenna_type)) | |
1206 | break; | |
1207 | ||
77626355 | 1208 | /* Set up search table to try other antenna */ |
b481de9c ZY |
1209 | memcpy(search_tbl, tbl, sz); |
1210 | ||
1211 | rs_toggle_antenna(&(search_tbl->current_rate), | |
1212 | search_tbl); | |
1213 | rs_get_expected_tpt_table(lq_data, search_tbl); | |
1214 | lq_data->search_better_tbl = 1; | |
1215 | goto out; | |
1216 | ||
1217 | case IWL_LEGACY_SWITCH_SISO: | |
1218 | IWL_DEBUG_HT("LQ: Legacy switch to SISO\n"); | |
77626355 BC |
1219 | |
1220 | /* Set up search table to try SISO */ | |
b481de9c ZY |
1221 | memcpy(search_tbl, tbl, sz); |
1222 | search_tbl->lq_type = LQ_SISO; | |
1223 | search_tbl->is_SGI = 0; | |
1224 | search_tbl->is_fat = 0; | |
270243a5 RR |
1225 | ret = rs_switch_to_siso(priv, lq_data, conf, sta, |
1226 | search_tbl, index); | |
dc2453ae | 1227 | if (!ret) { |
b481de9c ZY |
1228 | lq_data->search_better_tbl = 1; |
1229 | lq_data->action_counter = 0; | |
b481de9c | 1230 | goto out; |
dc2453ae | 1231 | } |
b481de9c ZY |
1232 | |
1233 | break; | |
1234 | case IWL_LEGACY_SWITCH_MIMO: | |
1235 | IWL_DEBUG_HT("LQ: Legacy switch MIMO\n"); | |
77626355 BC |
1236 | |
1237 | /* Set up search table to try MIMO */ | |
b481de9c ZY |
1238 | memcpy(search_tbl, tbl, sz); |
1239 | search_tbl->lq_type = LQ_MIMO; | |
1240 | search_tbl->is_SGI = 0; | |
1241 | search_tbl->is_fat = 0; | |
1242 | search_tbl->antenna_type = ANT_BOTH; | |
270243a5 RR |
1243 | ret = rs_switch_to_mimo(priv, lq_data, conf, sta, |
1244 | search_tbl, index); | |
dc2453ae | 1245 | if (!ret) { |
b481de9c ZY |
1246 | lq_data->search_better_tbl = 1; |
1247 | lq_data->action_counter = 0; | |
b481de9c | 1248 | goto out; |
dc2453ae | 1249 | } |
b481de9c ZY |
1250 | break; |
1251 | } | |
1252 | tbl->action++; | |
1253 | if (tbl->action > IWL_LEGACY_SWITCH_MIMO) | |
1254 | tbl->action = IWL_LEGACY_SWITCH_ANTENNA; | |
1255 | ||
1256 | if (tbl->action == start_action) | |
1257 | break; | |
1258 | ||
1259 | } | |
1260 | return 0; | |
1261 | ||
1262 | out: | |
1263 | tbl->action++; | |
1264 | if (tbl->action > IWL_LEGACY_SWITCH_MIMO) | |
1265 | tbl->action = IWL_LEGACY_SWITCH_ANTENNA; | |
1266 | return 0; | |
1267 | ||
1268 | } | |
1269 | ||
77626355 BC |
1270 | /* |
1271 | * Try to switch to new modulation mode from SISO | |
1272 | */ | |
bb8c093b CH |
1273 | static int rs_move_siso_to_other(struct iwl4965_priv *priv, |
1274 | struct iwl4965_rate_scale_priv *lq_data, | |
270243a5 RR |
1275 | struct ieee80211_conf *conf, |
1276 | struct sta_info *sta, | |
b481de9c ZY |
1277 | int index) |
1278 | { | |
dc2453ae | 1279 | int ret; |
b481de9c | 1280 | u8 is_green = lq_data->is_green; |
bb8c093b | 1281 | struct iwl4965_scale_tbl_info *tbl = |
b481de9c | 1282 | &(lq_data->lq_info[lq_data->active_tbl]); |
bb8c093b | 1283 | struct iwl4965_scale_tbl_info *search_tbl = |
b481de9c | 1284 | &(lq_data->lq_info[(1 - lq_data->active_tbl)]); |
bb8c093b CH |
1285 | struct iwl4965_rate_scale_data *window = &(tbl->win[index]); |
1286 | u32 sz = (sizeof(struct iwl4965_scale_tbl_info) - | |
1287 | (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT)); | |
b481de9c ZY |
1288 | u8 start_action = tbl->action; |
1289 | ||
1290 | for (;;) { | |
1291 | lq_data->action_counter++; | |
1292 | switch (tbl->action) { | |
1293 | case IWL_SISO_SWITCH_ANTENNA: | |
1294 | IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n"); | |
1295 | search_tbl->lq_type = LQ_NONE; | |
1296 | if (window->success_ratio >= IWL_RS_GOOD_RATIO) | |
1297 | break; | |
1298 | if (!rs_is_other_ant_connected(lq_data->antenna, | |
1299 | tbl->antenna_type)) | |
1300 | break; | |
1301 | ||
1302 | memcpy(search_tbl, tbl, sz); | |
1303 | search_tbl->action = IWL_SISO_SWITCH_MIMO; | |
1304 | rs_toggle_antenna(&(search_tbl->current_rate), | |
1305 | search_tbl); | |
1306 | lq_data->search_better_tbl = 1; | |
1307 | ||
1308 | goto out; | |
1309 | ||
1310 | case IWL_SISO_SWITCH_MIMO: | |
1311 | IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n"); | |
1312 | memcpy(search_tbl, tbl, sz); | |
1313 | search_tbl->lq_type = LQ_MIMO; | |
1314 | search_tbl->is_SGI = 0; | |
1315 | search_tbl->is_fat = 0; | |
1316 | search_tbl->antenna_type = ANT_BOTH; | |
270243a5 RR |
1317 | ret = rs_switch_to_mimo(priv, lq_data, conf, sta, |
1318 | search_tbl, index); | |
dc2453ae | 1319 | if (!ret) { |
b481de9c | 1320 | lq_data->search_better_tbl = 1; |
b481de9c | 1321 | goto out; |
dc2453ae | 1322 | } |
b481de9c ZY |
1323 | break; |
1324 | case IWL_SISO_SWITCH_GI: | |
1325 | IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n"); | |
1326 | memcpy(search_tbl, tbl, sz); | |
1327 | search_tbl->action = 0; | |
1328 | if (search_tbl->is_SGI) | |
1329 | search_tbl->is_SGI = 0; | |
1330 | else if (!is_green) | |
1331 | search_tbl->is_SGI = 1; | |
1332 | else | |
1333 | break; | |
1334 | lq_data->search_better_tbl = 1; | |
1335 | if ((tbl->lq_type == LQ_SISO) && | |
1336 | (tbl->is_SGI)) { | |
1337 | s32 tpt = lq_data->last_tpt / 100; | |
1338 | if (((!tbl->is_fat) && | |
1339 | (tpt >= expected_tpt_siso20MHz[index])) || | |
1340 | ((tbl->is_fat) && | |
1341 | (tpt >= expected_tpt_siso40MHz[index]))) | |
1342 | lq_data->search_better_tbl = 0; | |
1343 | } | |
1344 | rs_get_expected_tpt_table(lq_data, search_tbl); | |
1345 | rs_mcs_from_tbl(&search_tbl->current_rate, | |
1346 | search_tbl, index, is_green); | |
1347 | goto out; | |
1348 | } | |
1349 | tbl->action++; | |
1350 | if (tbl->action > IWL_SISO_SWITCH_GI) | |
1351 | tbl->action = IWL_SISO_SWITCH_ANTENNA; | |
1352 | ||
1353 | if (tbl->action == start_action) | |
1354 | break; | |
1355 | } | |
1356 | return 0; | |
1357 | ||
1358 | out: | |
1359 | tbl->action++; | |
1360 | if (tbl->action > IWL_SISO_SWITCH_GI) | |
1361 | tbl->action = IWL_SISO_SWITCH_ANTENNA; | |
1362 | return 0; | |
1363 | } | |
1364 | ||
77626355 BC |
1365 | /* |
1366 | * Try to switch to new modulation mode from MIMO | |
1367 | */ | |
bb8c093b CH |
1368 | static int rs_move_mimo_to_other(struct iwl4965_priv *priv, |
1369 | struct iwl4965_rate_scale_priv *lq_data, | |
270243a5 RR |
1370 | struct ieee80211_conf *conf, |
1371 | struct sta_info *sta, | |
b481de9c ZY |
1372 | int index) |
1373 | { | |
dc2453ae | 1374 | int ret; |
b481de9c | 1375 | s8 is_green = lq_data->is_green; |
bb8c093b | 1376 | struct iwl4965_scale_tbl_info *tbl = |
b481de9c | 1377 | &(lq_data->lq_info[lq_data->active_tbl]); |
bb8c093b | 1378 | struct iwl4965_scale_tbl_info *search_tbl = |
b481de9c | 1379 | &(lq_data->lq_info[(1 - lq_data->active_tbl)]); |
bb8c093b CH |
1380 | u32 sz = (sizeof(struct iwl4965_scale_tbl_info) - |
1381 | (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT)); | |
b481de9c ZY |
1382 | u8 start_action = tbl->action; |
1383 | ||
1384 | for (;;) { | |
1385 | lq_data->action_counter++; | |
1386 | switch (tbl->action) { | |
1387 | case IWL_MIMO_SWITCH_ANTENNA_A: | |
1388 | case IWL_MIMO_SWITCH_ANTENNA_B: | |
1389 | IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n"); | |
77626355 BC |
1390 | |
1391 | /* Set up new search table for SISO */ | |
b481de9c ZY |
1392 | memcpy(search_tbl, tbl, sz); |
1393 | search_tbl->lq_type = LQ_SISO; | |
1394 | search_tbl->is_SGI = 0; | |
1395 | search_tbl->is_fat = 0; | |
1396 | if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A) | |
1397 | search_tbl->antenna_type = ANT_MAIN; | |
1398 | else | |
1399 | search_tbl->antenna_type = ANT_AUX; | |
1400 | ||
270243a5 RR |
1401 | ret = rs_switch_to_siso(priv, lq_data, conf, sta, |
1402 | search_tbl, index); | |
dc2453ae | 1403 | if (!ret) { |
b481de9c ZY |
1404 | lq_data->search_better_tbl = 1; |
1405 | goto out; | |
1406 | } | |
1407 | break; | |
1408 | ||
1409 | case IWL_MIMO_SWITCH_GI: | |
1410 | IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n"); | |
77626355 BC |
1411 | |
1412 | /* Set up new search table for MIMO */ | |
b481de9c ZY |
1413 | memcpy(search_tbl, tbl, sz); |
1414 | search_tbl->lq_type = LQ_MIMO; | |
1415 | search_tbl->antenna_type = ANT_BOTH; | |
1416 | search_tbl->action = 0; | |
1417 | if (search_tbl->is_SGI) | |
1418 | search_tbl->is_SGI = 0; | |
1419 | else | |
1420 | search_tbl->is_SGI = 1; | |
1421 | lq_data->search_better_tbl = 1; | |
77626355 BC |
1422 | |
1423 | /* | |
1424 | * If active table already uses the fastest possible | |
1425 | * modulation (dual stream with short guard interval), | |
1426 | * and it's working well, there's no need to look | |
1427 | * for a better type of modulation! | |
1428 | */ | |
b481de9c ZY |
1429 | if ((tbl->lq_type == LQ_MIMO) && |
1430 | (tbl->is_SGI)) { | |
1431 | s32 tpt = lq_data->last_tpt / 100; | |
1432 | if (((!tbl->is_fat) && | |
1433 | (tpt >= expected_tpt_mimo20MHz[index])) || | |
1434 | ((tbl->is_fat) && | |
1435 | (tpt >= expected_tpt_mimo40MHz[index]))) | |
1436 | lq_data->search_better_tbl = 0; | |
1437 | } | |
1438 | rs_get_expected_tpt_table(lq_data, search_tbl); | |
1439 | rs_mcs_from_tbl(&search_tbl->current_rate, | |
1440 | search_tbl, index, is_green); | |
1441 | goto out; | |
1442 | ||
1443 | } | |
1444 | tbl->action++; | |
1445 | if (tbl->action > IWL_MIMO_SWITCH_GI) | |
1446 | tbl->action = IWL_MIMO_SWITCH_ANTENNA_A; | |
1447 | ||
1448 | if (tbl->action == start_action) | |
1449 | break; | |
1450 | } | |
1451 | ||
1452 | return 0; | |
1453 | out: | |
1454 | tbl->action++; | |
1455 | if (tbl->action > IWL_MIMO_SWITCH_GI) | |
1456 | tbl->action = IWL_MIMO_SWITCH_ANTENNA_A; | |
1457 | return 0; | |
1458 | ||
1459 | } | |
1460 | ||
77626355 BC |
1461 | /* |
1462 | * Check whether we should continue using same modulation mode, or | |
1463 | * begin search for a new mode, based on: | |
1464 | * 1) # tx successes or failures while using this mode | |
1465 | * 2) # times calling this function | |
1466 | * 3) elapsed time in this mode (not used, for now) | |
1467 | */ | |
bb8c093b | 1468 | static void rs_stay_in_table(struct iwl4965_rate_scale_priv *lq_data) |
b481de9c | 1469 | { |
bb8c093b | 1470 | struct iwl4965_scale_tbl_info *tbl; |
b481de9c ZY |
1471 | int i; |
1472 | int active_tbl; | |
1473 | int flush_interval_passed = 0; | |
1474 | ||
1475 | active_tbl = lq_data->active_tbl; | |
1476 | ||
1477 | tbl = &(lq_data->lq_info[active_tbl]); | |
1478 | ||
77626355 | 1479 | /* If we've been disallowing search, see if we should now allow it */ |
b481de9c ZY |
1480 | if (lq_data->stay_in_tbl) { |
1481 | ||
77626355 | 1482 | /* Elapsed time using current modulation mode */ |
b481de9c ZY |
1483 | if (lq_data->flush_timer) |
1484 | flush_interval_passed = | |
1485 | time_after(jiffies, | |
1486 | (unsigned long)(lq_data->flush_timer + | |
1487 | IWL_RATE_SCALE_FLUSH_INTVL)); | |
1488 | ||
77626355 | 1489 | /* For now, disable the elapsed time criterion */ |
b481de9c | 1490 | flush_interval_passed = 0; |
77626355 BC |
1491 | |
1492 | /* | |
1493 | * Check if we should allow search for new modulation mode. | |
1494 | * If many frames have failed or succeeded, or we've used | |
1495 | * this same modulation for a long time, allow search, and | |
1496 | * reset history stats that keep track of whether we should | |
1497 | * allow a new search. Also (below) reset all bitmaps and | |
1498 | * stats in active history. | |
1499 | */ | |
b481de9c ZY |
1500 | if ((lq_data->total_failed > lq_data->max_failure_limit) || |
1501 | (lq_data->total_success > lq_data->max_success_limit) || | |
1502 | ((!lq_data->search_better_tbl) && (lq_data->flush_timer) | |
1503 | && (flush_interval_passed))) { | |
1504 | IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:", | |
1505 | lq_data->total_failed, | |
1506 | lq_data->total_success, | |
1507 | flush_interval_passed); | |
77626355 BC |
1508 | |
1509 | /* Allow search for new mode */ | |
1510 | lq_data->stay_in_tbl = 0; /* only place reset */ | |
b481de9c ZY |
1511 | lq_data->total_failed = 0; |
1512 | lq_data->total_success = 0; | |
1513 | lq_data->flush_timer = 0; | |
77626355 BC |
1514 | |
1515 | /* | |
1516 | * Else if we've used this modulation mode enough repetitions | |
1517 | * (regardless of elapsed time or success/failure), reset | |
1518 | * history bitmaps and rate-specific stats for all rates in | |
1519 | * active table. | |
1520 | */ | |
403ab56b | 1521 | } else { |
b481de9c ZY |
1522 | lq_data->table_count++; |
1523 | if (lq_data->table_count >= | |
1524 | lq_data->table_count_limit) { | |
1525 | lq_data->table_count = 0; | |
1526 | ||
1527 | IWL_DEBUG_HT("LQ: stay in table clear win\n"); | |
1528 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
1529 | rs_rate_scale_clear_window( | |
1530 | &(tbl->win[i])); | |
1531 | } | |
1532 | } | |
1533 | ||
77626355 BC |
1534 | /* If transitioning to allow "search", reset all history |
1535 | * bitmaps and stats in active table (this will become the new | |
1536 | * "search" table). */ | |
b481de9c ZY |
1537 | if (!lq_data->stay_in_tbl) { |
1538 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
1539 | rs_rate_scale_clear_window(&(tbl->win[i])); | |
1540 | } | |
1541 | } | |
1542 | } | |
1543 | ||
77626355 BC |
1544 | /* |
1545 | * Do rate scaling and search for new modulation mode. | |
1546 | */ | |
bb8c093b | 1547 | static void rs_rate_scale_perform(struct iwl4965_priv *priv, |
b481de9c ZY |
1548 | struct net_device *dev, |
1549 | struct ieee80211_hdr *hdr, | |
1550 | struct sta_info *sta) | |
1551 | { | |
270243a5 RR |
1552 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
1553 | struct ieee80211_hw *hw = local_to_hw(local); | |
1554 | struct ieee80211_conf *conf = &hw->conf; | |
b481de9c ZY |
1555 | int low = IWL_RATE_INVALID; |
1556 | int high = IWL_RATE_INVALID; | |
1557 | int index; | |
1558 | int i; | |
bb8c093b | 1559 | struct iwl4965_rate_scale_data *window = NULL; |
b481de9c ZY |
1560 | int current_tpt = IWL_INVALID_VALUE; |
1561 | int low_tpt = IWL_INVALID_VALUE; | |
1562 | int high_tpt = IWL_INVALID_VALUE; | |
1563 | u32 fail_count; | |
1564 | s8 scale_action = 0; | |
1565 | u16 fc, rate_mask; | |
1566 | u8 update_lq = 0; | |
bb8c093b CH |
1567 | struct iwl4965_rate_scale_priv *lq_data; |
1568 | struct iwl4965_scale_tbl_info *tbl, *tbl1; | |
b481de9c | 1569 | u16 rate_scale_index_msk = 0; |
bb8c093b | 1570 | struct iwl4965_rate mcs_rate; |
b481de9c ZY |
1571 | u8 is_green = 0; |
1572 | u8 active_tbl = 0; | |
1573 | u8 done_search = 0; | |
1574 | u16 high_low; | |
1575 | ||
1576 | IWL_DEBUG_RATE("rate scale calculate new rate for skb\n"); | |
1577 | ||
1578 | fc = le16_to_cpu(hdr->frame_control); | |
1579 | if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) { | |
1580 | /* Send management frames and broadcast/multicast data using | |
1581 | * lowest rate. */ | |
1582 | /* TODO: this could probably be improved.. */ | |
1583 | return; | |
1584 | } | |
1585 | ||
1586 | if (!sta || !sta->rate_ctrl_priv) | |
1587 | return; | |
1588 | ||
1589 | if (!priv->lq_mngr.lq_ready) { | |
1590 | IWL_DEBUG_RATE("still rate scaling not ready\n"); | |
1591 | return; | |
1592 | } | |
bb8c093b | 1593 | lq_data = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv; |
b481de9c | 1594 | |
77626355 BC |
1595 | /* |
1596 | * Select rate-scale / modulation-mode table to work with in | |
1597 | * the rest of this function: "search" if searching for better | |
1598 | * modulation mode, or "active" if doing rate scaling within a mode. | |
1599 | */ | |
b481de9c ZY |
1600 | if (!lq_data->search_better_tbl) |
1601 | active_tbl = lq_data->active_tbl; | |
1602 | else | |
1603 | active_tbl = 1 - lq_data->active_tbl; | |
1604 | ||
1605 | tbl = &(lq_data->lq_info[active_tbl]); | |
1606 | is_green = lq_data->is_green; | |
1607 | ||
77626355 | 1608 | /* current tx rate */ |
b481de9c ZY |
1609 | index = sta->last_txrate; |
1610 | ||
1611 | IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index, | |
1612 | tbl->lq_type); | |
1613 | ||
77626355 | 1614 | /* rates available for this association, and for modulation mode */ |
b481de9c ZY |
1615 | rs_get_supported_rates(lq_data, hdr, tbl->lq_type, |
1616 | &rate_mask); | |
1617 | ||
1618 | IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask); | |
1619 | ||
1620 | /* mask with station rate restriction */ | |
1621 | if (is_legacy(tbl->lq_type)) { | |
1622 | if (lq_data->phymode == (u8) MODE_IEEE80211A) | |
77626355 | 1623 | /* supp_rates has no CCK bits in A mode */ |
b481de9c | 1624 | rate_scale_index_msk = (u16) (rate_mask & |
02dede04 | 1625 | (lq_data->supp_rates << IWL_FIRST_OFDM_RATE)); |
b481de9c ZY |
1626 | else |
1627 | rate_scale_index_msk = (u16) (rate_mask & | |
02dede04 | 1628 | lq_data->supp_rates); |
b481de9c ZY |
1629 | |
1630 | } else | |
1631 | rate_scale_index_msk = rate_mask; | |
1632 | ||
1633 | if (!rate_scale_index_msk) | |
1634 | rate_scale_index_msk = rate_mask; | |
1635 | ||
77626355 BC |
1636 | /* If current rate is no longer supported on current association, |
1637 | * or user changed preferences for rates, find a new supported rate. */ | |
b481de9c ZY |
1638 | if (index < 0 || !((1 << index) & rate_scale_index_msk)) { |
1639 | index = IWL_INVALID_VALUE; | |
1640 | update_lq = 1; | |
1641 | ||
77626355 | 1642 | /* get the highest available rate */ |
b481de9c ZY |
1643 | for (i = 0; i <= IWL_RATE_COUNT; i++) { |
1644 | if ((1 << i) & rate_scale_index_msk) | |
1645 | index = i; | |
1646 | } | |
1647 | ||
1648 | if (index == IWL_INVALID_VALUE) { | |
1649 | IWL_WARNING("Can not find a suitable rate\n"); | |
1650 | return; | |
1651 | } | |
1652 | } | |
1653 | ||
77626355 | 1654 | /* Get expected throughput table and history window for current rate */ |
b481de9c ZY |
1655 | if (!tbl->expected_tpt) |
1656 | rs_get_expected_tpt_table(lq_data, tbl); | |
1657 | ||
1658 | window = &(tbl->win[index]); | |
1659 | ||
77626355 BC |
1660 | /* |
1661 | * If there is not enough history to calculate actual average | |
1662 | * throughput, keep analyzing results of more tx frames, without | |
1663 | * changing rate or mode (bypass most of the rest of this function). | |
1664 | * Set up new rate table in uCode only if old rate is not supported | |
1665 | * in current association (use new rate found above). | |
1666 | */ | |
b481de9c ZY |
1667 | fail_count = window->counter - window->success_counter; |
1668 | if (((fail_count < IWL_RATE_MIN_FAILURE_TH) && | |
1669 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) | |
1670 | || (tbl->expected_tpt == NULL)) { | |
1671 | IWL_DEBUG_RATE("LQ: still below TH succ %d total %d " | |
1672 | "for index %d\n", | |
1673 | window->success_counter, window->counter, index); | |
77626355 BC |
1674 | |
1675 | /* Can't calculate this yet; not enough history */ | |
b481de9c | 1676 | window->average_tpt = IWL_INVALID_VALUE; |
77626355 BC |
1677 | |
1678 | /* Should we stay with this modulation mode, | |
1679 | * or search for a new one? */ | |
b481de9c | 1680 | rs_stay_in_table(lq_data); |
77626355 BC |
1681 | |
1682 | /* Set up new rate table in uCode, if needed */ | |
b481de9c ZY |
1683 | if (update_lq) { |
1684 | rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green); | |
02dede04 | 1685 | rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq); |
b481de9c ZY |
1686 | rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC); |
1687 | } | |
1688 | goto out; | |
1689 | ||
77626355 BC |
1690 | /* Else we have enough samples; calculate estimate of |
1691 | * actual average throughput */ | |
b481de9c ZY |
1692 | } else |
1693 | window->average_tpt = ((window->success_ratio * | |
1694 | tbl->expected_tpt[index] + 64) / 128); | |
1695 | ||
77626355 | 1696 | /* If we are searching for better modulation mode, check success. */ |
b481de9c ZY |
1697 | if (lq_data->search_better_tbl) { |
1698 | int success_limit = IWL_RATE_SCALE_SWITCH; | |
1699 | ||
77626355 BC |
1700 | /* If good success, continue using the "search" mode; |
1701 | * no need to send new link quality command, since we're | |
1702 | * continuing to use the setup that we've been trying. */ | |
b481de9c ZY |
1703 | if ((window->success_ratio > success_limit) || |
1704 | (window->average_tpt > lq_data->last_tpt)) { | |
1705 | if (!is_legacy(tbl->lq_type)) { | |
1706 | IWL_DEBUG_HT("LQ: we are switching to HT" | |
1707 | " rate suc %d current tpt %d" | |
1708 | " old tpt %d\n", | |
1709 | window->success_ratio, | |
1710 | window->average_tpt, | |
1711 | lq_data->last_tpt); | |
1712 | lq_data->enable_counter = 1; | |
1713 | } | |
77626355 | 1714 | /* Swap tables; "search" becomes "active" */ |
b481de9c ZY |
1715 | lq_data->active_tbl = active_tbl; |
1716 | current_tpt = window->average_tpt; | |
77626355 BC |
1717 | |
1718 | /* Else poor success; go back to mode in "active" table */ | |
b481de9c | 1719 | } else { |
77626355 | 1720 | /* Nullify "search" table */ |
b481de9c | 1721 | tbl->lq_type = LQ_NONE; |
77626355 BC |
1722 | |
1723 | /* Revert to "active" table */ | |
b481de9c ZY |
1724 | active_tbl = lq_data->active_tbl; |
1725 | tbl = &(lq_data->lq_info[active_tbl]); | |
1726 | ||
77626355 | 1727 | /* Revert to "active" rate and throughput info */ |
bb8c093b | 1728 | index = iwl4965_rate_index_from_plcp( |
b481de9c | 1729 | tbl->current_rate.rate_n_flags); |
77626355 | 1730 | current_tpt = lq_data->last_tpt; |
b481de9c | 1731 | |
77626355 | 1732 | /* Need to set up a new rate table in uCode */ |
b481de9c | 1733 | update_lq = 1; |
b481de9c ZY |
1734 | IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n"); |
1735 | } | |
77626355 BC |
1736 | |
1737 | /* Either way, we've made a decision; modulation mode | |
1738 | * search is done, allow rate adjustment next time. */ | |
b481de9c | 1739 | lq_data->search_better_tbl = 0; |
77626355 | 1740 | done_search = 1; /* Don't switch modes below! */ |
b481de9c ZY |
1741 | goto lq_update; |
1742 | } | |
1743 | ||
77626355 BC |
1744 | /* (Else) not in search of better modulation mode, try for better |
1745 | * starting rate, while staying in this mode. */ | |
b481de9c ZY |
1746 | high_low = rs_get_adjacent_rate(index, rate_scale_index_msk, |
1747 | tbl->lq_type); | |
1748 | low = high_low & 0xff; | |
1749 | high = (high_low >> 8) & 0xff; | |
1750 | ||
77626355 | 1751 | /* Collect measured throughputs for current and adjacent rates */ |
b481de9c | 1752 | current_tpt = window->average_tpt; |
b481de9c ZY |
1753 | if (low != IWL_RATE_INVALID) |
1754 | low_tpt = tbl->win[low].average_tpt; | |
b481de9c ZY |
1755 | if (high != IWL_RATE_INVALID) |
1756 | high_tpt = tbl->win[high].average_tpt; | |
1757 | ||
77626355 | 1758 | /* Assume rate increase */ |
b481de9c ZY |
1759 | scale_action = 1; |
1760 | ||
77626355 | 1761 | /* Too many failures, decrease rate */ |
b481de9c ZY |
1762 | if ((window->success_ratio <= IWL_RATE_DECREASE_TH) || |
1763 | (current_tpt == 0)) { | |
1764 | IWL_DEBUG_RATE("decrease rate because of low success_ratio\n"); | |
1765 | scale_action = -1; | |
77626355 BC |
1766 | |
1767 | /* No throughput measured yet for adjacent rates; try increase. */ | |
b481de9c ZY |
1768 | } else if ((low_tpt == IWL_INVALID_VALUE) && |
1769 | (high_tpt == IWL_INVALID_VALUE)) | |
1770 | scale_action = 1; | |
77626355 BC |
1771 | |
1772 | /* Both adjacent throughputs are measured, but neither one has better | |
1773 | * throughput; we're using the best rate, don't change it! */ | |
b481de9c ZY |
1774 | else if ((low_tpt != IWL_INVALID_VALUE) && |
1775 | (high_tpt != IWL_INVALID_VALUE) && | |
1776 | (low_tpt < current_tpt) && | |
1777 | (high_tpt < current_tpt)) | |
1778 | scale_action = 0; | |
77626355 BC |
1779 | |
1780 | /* At least one adjacent rate's throughput is measured, | |
1781 | * and may have better performance. */ | |
b481de9c | 1782 | else { |
77626355 | 1783 | /* Higher adjacent rate's throughput is measured */ |
b481de9c | 1784 | if (high_tpt != IWL_INVALID_VALUE) { |
77626355 | 1785 | /* Higher rate has better throughput */ |
b481de9c ZY |
1786 | if (high_tpt > current_tpt) |
1787 | scale_action = 1; | |
1788 | else { | |
1789 | IWL_DEBUG_RATE | |
1790 | ("decrease rate because of high tpt\n"); | |
1791 | scale_action = -1; | |
1792 | } | |
77626355 BC |
1793 | |
1794 | /* Lower adjacent rate's throughput is measured */ | |
b481de9c | 1795 | } else if (low_tpt != IWL_INVALID_VALUE) { |
77626355 | 1796 | /* Lower rate has better throughput */ |
b481de9c ZY |
1797 | if (low_tpt > current_tpt) { |
1798 | IWL_DEBUG_RATE | |
1799 | ("decrease rate because of low tpt\n"); | |
1800 | scale_action = -1; | |
1801 | } else | |
1802 | scale_action = 1; | |
1803 | } | |
1804 | } | |
1805 | ||
77626355 BC |
1806 | /* Sanity check; asked for decrease, but success rate or throughput |
1807 | * has been good at old rate. Don't change it. */ | |
b481de9c ZY |
1808 | if (scale_action == -1) { |
1809 | if ((low != IWL_RATE_INVALID) && | |
1810 | ((window->success_ratio > IWL_RATE_HIGH_TH) || | |
1811 | (current_tpt > (100 * tbl->expected_tpt[low])))) | |
1812 | scale_action = 0; | |
77626355 BC |
1813 | |
1814 | /* Sanity check; asked for increase, but success rate has not been great | |
1815 | * even at old rate, higher rate will be worse. Don't change it. */ | |
b481de9c ZY |
1816 | } else if ((scale_action == 1) && |
1817 | (window->success_ratio < IWL_RATE_INCREASE_TH)) | |
1818 | scale_action = 0; | |
1819 | ||
1820 | switch (scale_action) { | |
1821 | case -1: | |
77626355 | 1822 | /* Decrease starting rate, update uCode's rate table */ |
b481de9c ZY |
1823 | if (low != IWL_RATE_INVALID) { |
1824 | update_lq = 1; | |
1825 | index = low; | |
1826 | } | |
1827 | break; | |
1828 | case 1: | |
77626355 | 1829 | /* Increase starting rate, update uCode's rate table */ |
b481de9c ZY |
1830 | if (high != IWL_RATE_INVALID) { |
1831 | update_lq = 1; | |
1832 | index = high; | |
1833 | } | |
1834 | ||
1835 | break; | |
1836 | case 0: | |
77626355 | 1837 | /* No change */ |
b481de9c ZY |
1838 | default: |
1839 | break; | |
1840 | } | |
1841 | ||
1842 | IWL_DEBUG_HT("choose rate scale index %d action %d low %d " | |
1843 | "high %d type %d\n", | |
1844 | index, scale_action, low, high, tbl->lq_type); | |
1845 | ||
1846 | lq_update: | |
77626355 | 1847 | /* Replace uCode's rate table for the destination station. */ |
b481de9c ZY |
1848 | if (update_lq) { |
1849 | rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green); | |
02dede04 | 1850 | rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq); |
b481de9c ZY |
1851 | rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC); |
1852 | } | |
77626355 BC |
1853 | |
1854 | /* Should we stay with this modulation mode, or search for a new one? */ | |
b481de9c ZY |
1855 | rs_stay_in_table(lq_data); |
1856 | ||
77626355 BC |
1857 | /* |
1858 | * Search for new modulation mode if we're: | |
1859 | * 1) Not changing rates right now | |
1860 | * 2) Not just finishing up a search | |
1861 | * 3) Allowing a new search | |
1862 | */ | |
b481de9c | 1863 | if (!update_lq && !done_search && !lq_data->stay_in_tbl) { |
77626355 | 1864 | /* Save current throughput to compare with "search" throughput*/ |
b481de9c ZY |
1865 | lq_data->last_tpt = current_tpt; |
1866 | ||
77626355 BC |
1867 | /* Select a new "search" modulation mode to try. |
1868 | * If one is found, set up the new "search" table. */ | |
b481de9c | 1869 | if (is_legacy(tbl->lq_type)) |
270243a5 | 1870 | rs_move_legacy_other(priv, lq_data, conf, sta, index); |
b481de9c | 1871 | else if (is_siso(tbl->lq_type)) |
270243a5 | 1872 | rs_move_siso_to_other(priv, lq_data, conf, sta, index); |
b481de9c | 1873 | else |
270243a5 | 1874 | rs_move_mimo_to_other(priv, lq_data, conf, sta, index); |
b481de9c | 1875 | |
77626355 | 1876 | /* If new "search" mode was selected, set up in uCode table */ |
b481de9c | 1877 | if (lq_data->search_better_tbl) { |
77626355 | 1878 | /* Access the "search" table, clear its history. */ |
b481de9c ZY |
1879 | tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]); |
1880 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
1881 | rs_rate_scale_clear_window(&(tbl->win[i])); | |
1882 | ||
77626355 | 1883 | /* Use new "search" start rate */ |
bb8c093b | 1884 | index = iwl4965_rate_index_from_plcp( |
b481de9c ZY |
1885 | tbl->current_rate.rate_n_flags); |
1886 | ||
1887 | IWL_DEBUG_HT("Switch current mcs: %X index: %d\n", | |
1888 | tbl->current_rate.rate_n_flags, index); | |
1889 | rs_fill_link_cmd(lq_data, &tbl->current_rate, | |
02dede04 | 1890 | &lq_data->lq); |
b481de9c ZY |
1891 | rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC); |
1892 | } | |
b481de9c | 1893 | |
77626355 BC |
1894 | /* If the "active" (non-search) mode was legacy, |
1895 | * and we've tried switching antennas, | |
1896 | * but we haven't been able to try HT modes (not available), | |
1897 | * stay with best antenna legacy modulation for a while | |
1898 | * before next round of mode comparisons. */ | |
1899 | tbl1 = &(lq_data->lq_info[lq_data->active_tbl]); | |
b481de9c | 1900 | if (is_legacy(tbl1->lq_type) && |
c8b0e6e1 | 1901 | #ifdef CONFIG_IWL4965_HT |
270243a5 | 1902 | (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) && |
b481de9c ZY |
1903 | #endif |
1904 | (lq_data->action_counter >= 1)) { | |
1905 | lq_data->action_counter = 0; | |
1906 | IWL_DEBUG_HT("LQ: STAY in legacy table\n"); | |
1907 | rs_set_stay_in_table(1, lq_data); | |
1908 | } | |
1909 | ||
77626355 BC |
1910 | /* If we're in an HT mode, and all 3 mode switch actions |
1911 | * have been tried and compared, stay in this best modulation | |
1912 | * mode for a while before next round of mode comparisons. */ | |
b481de9c ZY |
1913 | if (lq_data->enable_counter && |
1914 | (lq_data->action_counter >= IWL_ACTION_LIMIT)) { | |
c8b0e6e1 | 1915 | #ifdef CONFIG_IWL4965_HT_AGG |
77626355 | 1916 | /* If appropriate, set up aggregation! */ |
b481de9c ZY |
1917 | if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) && |
1918 | (priv->lq_mngr.agg_ctrl.auto_agg)) { | |
1919 | priv->lq_mngr.agg_ctrl.tid_retry = | |
1920 | TID_ALL_SPECIFIED; | |
1921 | schedule_work(&priv->agg_work); | |
1922 | } | |
c8b0e6e1 | 1923 | #endif /*CONFIG_IWL4965_HT_AGG */ |
b481de9c ZY |
1924 | lq_data->action_counter = 0; |
1925 | rs_set_stay_in_table(0, lq_data); | |
1926 | } | |
77626355 BC |
1927 | |
1928 | /* | |
1929 | * Else, don't search for a new modulation mode. | |
1930 | * Put new timestamp in stay-in-modulation-mode flush timer if: | |
1931 | * 1) Not changing rates right now | |
1932 | * 2) Not just finishing up a search | |
1933 | * 3) flush timer is empty | |
1934 | */ | |
b481de9c ZY |
1935 | } else { |
1936 | if ((!update_lq) && (!done_search) && (!lq_data->flush_timer)) | |
1937 | lq_data->flush_timer = jiffies; | |
1938 | } | |
1939 | ||
1940 | out: | |
1941 | rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green); | |
1942 | i = index; | |
1943 | sta->last_txrate = i; | |
1944 | ||
1945 | /* sta->txrate is an index to A mode rates which start | |
1946 | * at IWL_FIRST_OFDM_RATE | |
1947 | */ | |
1948 | if (lq_data->phymode == (u8) MODE_IEEE80211A) | |
1949 | sta->txrate = i - IWL_FIRST_OFDM_RATE; | |
1950 | else | |
1951 | sta->txrate = i; | |
1952 | ||
1953 | return; | |
1954 | } | |
1955 | ||
1956 | ||
bb8c093b | 1957 | static void rs_initialize_lq(struct iwl4965_priv *priv, |
270243a5 | 1958 | struct ieee80211_conf *conf, |
b481de9c ZY |
1959 | struct sta_info *sta) |
1960 | { | |
1961 | int i; | |
bb8c093b CH |
1962 | struct iwl4965_rate_scale_priv *lq; |
1963 | struct iwl4965_scale_tbl_info *tbl; | |
b481de9c ZY |
1964 | u8 active_tbl = 0; |
1965 | int rate_idx; | |
270243a5 | 1966 | u8 use_green = rs_use_green(priv, conf); |
bb8c093b | 1967 | struct iwl4965_rate mcs_rate; |
b481de9c ZY |
1968 | |
1969 | if (!sta || !sta->rate_ctrl_priv) | |
1970 | goto out; | |
1971 | ||
bb8c093b | 1972 | lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv; |
b481de9c ZY |
1973 | i = sta->last_txrate; |
1974 | ||
1975 | if ((lq->lq.sta_id == 0xff) && | |
1976 | (priv->iw_mode == IEEE80211_IF_TYPE_IBSS)) | |
1977 | goto out; | |
1978 | ||
1979 | if (!lq->search_better_tbl) | |
1980 | active_tbl = lq->active_tbl; | |
1981 | else | |
1982 | active_tbl = 1 - lq->active_tbl; | |
1983 | ||
1984 | tbl = &(lq->lq_info[active_tbl]); | |
1985 | ||
1986 | if ((i < 0) || (i >= IWL_RATE_COUNT)) | |
1987 | i = 0; | |
1988 | ||
bb8c093b | 1989 | mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ; |
b481de9c ZY |
1990 | mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK; |
1991 | mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK; | |
1992 | ||
1993 | if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) | |
1994 | mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK; | |
1995 | ||
1996 | tbl->antenna_type = ANT_AUX; | |
1997 | rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx); | |
1998 | if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type)) | |
46640a8c | 1999 | rs_toggle_antenna(&mcs_rate, tbl); |
b481de9c ZY |
2000 | |
2001 | rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green); | |
2002 | tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags; | |
2003 | rs_get_expected_tpt_table(lq, tbl); | |
02dede04 | 2004 | rs_fill_link_cmd(lq, &mcs_rate, &lq->lq); |
b481de9c ZY |
2005 | rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC); |
2006 | out: | |
2007 | return; | |
2008 | } | |
2009 | ||
1abbe498 MN |
2010 | static void rs_get_rate(void *priv_rate, struct net_device *dev, |
2011 | struct ieee80211_hw_mode *mode, struct sk_buff *skb, | |
2012 | struct rate_selection *sel) | |
b481de9c ZY |
2013 | { |
2014 | ||
2015 | int i; | |
2016 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
270243a5 | 2017 | struct ieee80211_conf *conf = &local->hw.conf; |
b481de9c ZY |
2018 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
2019 | struct sta_info *sta; | |
2bc454b0 | 2020 | u16 fc; |
bb8c093b CH |
2021 | struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate; |
2022 | struct iwl4965_rate_scale_priv *lq; | |
b481de9c | 2023 | |
58826351 | 2024 | IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n"); |
b481de9c | 2025 | |
b481de9c ZY |
2026 | sta = sta_info_get(local, hdr->addr1); |
2027 | ||
2bc454b0 MW |
2028 | /* Send management frames and broadcast/multicast data using lowest |
2029 | * rate. */ | |
2030 | fc = le16_to_cpu(hdr->frame_control); | |
2031 | if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) || | |
2032 | !sta || !sta->rate_ctrl_priv) { | |
1abbe498 | 2033 | sel->rate = rate_lowest(local, local->oper_hw_mode, sta); |
b481de9c ZY |
2034 | if (sta) |
2035 | sta_info_put(sta); | |
1abbe498 | 2036 | return; |
b481de9c ZY |
2037 | } |
2038 | ||
bb8c093b | 2039 | lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv; |
b481de9c ZY |
2040 | i = sta->last_txrate; |
2041 | ||
2042 | if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) { | |
bb8c093b | 2043 | u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1); |
0795af57 | 2044 | DECLARE_MAC_BUF(mac); |
b481de9c ZY |
2045 | |
2046 | if (sta_id == IWL_INVALID_STATION) { | |
0795af57 JP |
2047 | IWL_DEBUG_RATE("LQ: ADD station %s\n", |
2048 | print_mac(mac, hdr->addr1)); | |
67d62035 RR |
2049 | sta_id = iwl4965_add_station_flags(priv, hdr->addr1, |
2050 | 0, CMD_ASYNC, NULL); | |
b481de9c ZY |
2051 | } |
2052 | if ((sta_id != IWL_INVALID_STATION)) { | |
2053 | lq->lq.sta_id = sta_id; | |
2054 | lq->lq.rs_table[0].rate_n_flags = 0; | |
2055 | lq->ibss_sta_added = 1; | |
270243a5 | 2056 | rs_initialize_lq(priv, conf, sta); |
b481de9c ZY |
2057 | } |
2058 | if (!lq->ibss_sta_added) | |
2059 | goto done; | |
2060 | } | |
2061 | ||
2062 | done: | |
1abbe498 MN |
2063 | if ((i < 0) || (i > IWL_RATE_COUNT)) { |
2064 | sel->rate = rate_lowest(local, local->oper_hw_mode, sta); | |
2065 | return; | |
2066 | } | |
b481de9c | 2067 | sta_info_put(sta); |
b481de9c | 2068 | |
1abbe498 | 2069 | sel->rate = &priv->ieee_rates[i]; |
b481de9c ZY |
2070 | } |
2071 | ||
2072 | static void *rs_alloc_sta(void *priv, gfp_t gfp) | |
2073 | { | |
bb8c093b | 2074 | struct iwl4965_rate_scale_priv *crl; |
b481de9c ZY |
2075 | int i, j; |
2076 | ||
2077 | IWL_DEBUG_RATE("create station rate scale window\n"); | |
2078 | ||
bb8c093b | 2079 | crl = kzalloc(sizeof(struct iwl4965_rate_scale_priv), gfp); |
b481de9c ZY |
2080 | |
2081 | if (crl == NULL) | |
2082 | return NULL; | |
b481de9c ZY |
2083 | crl->lq.sta_id = 0xff; |
2084 | ||
63fddb9f | 2085 | |
b481de9c ZY |
2086 | for (j = 0; j < LQ_SIZE; j++) |
2087 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
2088 | rs_rate_scale_clear_window(&(crl->lq_info[j].win[i])); | |
2089 | ||
2090 | return crl; | |
2091 | } | |
2092 | ||
2093 | static void rs_rate_init(void *priv_rate, void *priv_sta, | |
2094 | struct ieee80211_local *local, | |
2095 | struct sta_info *sta) | |
2096 | { | |
2097 | int i, j; | |
270243a5 | 2098 | struct ieee80211_conf *conf = &local->hw.conf; |
b481de9c | 2099 | struct ieee80211_hw_mode *mode = local->oper_hw_mode; |
bb8c093b CH |
2100 | struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate; |
2101 | struct iwl4965_rate_scale_priv *crl = priv_sta; | |
b481de9c | 2102 | |
b481de9c | 2103 | crl->flush_timer = 0; |
02dede04 | 2104 | crl->supp_rates = sta->supp_rates; |
b481de9c ZY |
2105 | sta->txrate = 3; |
2106 | for (j = 0; j < LQ_SIZE; j++) | |
2107 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
2108 | rs_rate_scale_clear_window(&(crl->lq_info[j].win[i])); | |
2109 | ||
2110 | IWL_DEBUG_RATE("rate scale global init\n"); | |
2111 | /* TODO: what is a good starting rate for STA? About middle? Maybe not | |
2112 | * the lowest or the highest rate.. Could consider using RSSI from | |
2113 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
2114 | * after assoc.. */ | |
2115 | ||
2116 | crl->ibss_sta_added = 0; | |
2117 | if (priv->iw_mode == IEEE80211_IF_TYPE_AP) { | |
bb8c093b | 2118 | u8 sta_id = iwl4965_hw_find_station(priv, sta->addr); |
0795af57 JP |
2119 | DECLARE_MAC_BUF(mac); |
2120 | ||
b481de9c | 2121 | /* for IBSS the call are from tasklet */ |
0795af57 JP |
2122 | IWL_DEBUG_HT("LQ: ADD station %s\n", |
2123 | print_mac(mac, sta->addr)); | |
b481de9c ZY |
2124 | |
2125 | if (sta_id == IWL_INVALID_STATION) { | |
0795af57 JP |
2126 | IWL_DEBUG_RATE("LQ: ADD station %s\n", |
2127 | print_mac(mac, sta->addr)); | |
67d62035 RR |
2128 | sta_id = iwl4965_add_station_flags(priv, sta->addr, |
2129 | 0, CMD_ASYNC, NULL); | |
b481de9c ZY |
2130 | } |
2131 | if ((sta_id != IWL_INVALID_STATION)) { | |
2132 | crl->lq.sta_id = sta_id; | |
2133 | crl->lq.rs_table[0].rate_n_flags = 0; | |
2134 | } | |
2135 | /* FIXME: this is w/a remove it later */ | |
2136 | priv->assoc_station_added = 1; | |
2137 | } | |
2138 | ||
77626355 | 2139 | /* Find highest tx rate supported by hardware and destination station */ |
b481de9c ZY |
2140 | for (i = 0; i < mode->num_rates; i++) { |
2141 | if ((sta->supp_rates & BIT(i)) && | |
2142 | (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED)) | |
2143 | sta->txrate = i; | |
2144 | } | |
2145 | sta->last_txrate = sta->txrate; | |
77626355 | 2146 | /* For MODE_IEEE80211A, cck rates are at end of rate table */ |
b481de9c ZY |
2147 | if (local->hw.conf.phymode == MODE_IEEE80211A) |
2148 | sta->last_txrate += IWL_FIRST_OFDM_RATE; | |
2149 | ||
9e0cc6de | 2150 | crl->is_dup = 0; |
b481de9c ZY |
2151 | crl->valid_antenna = priv->valid_antenna; |
2152 | crl->antenna = priv->antenna; | |
270243a5 | 2153 | crl->is_green = rs_use_green(priv, conf); |
b481de9c ZY |
2154 | crl->active_rate = priv->active_rate; |
2155 | crl->active_rate &= ~(0x1000); | |
2156 | crl->active_rate_basic = priv->active_rate_basic; | |
2157 | crl->phymode = priv->phymode; | |
c8b0e6e1 | 2158 | #ifdef CONFIG_IWL4965_HT |
77626355 BC |
2159 | /* |
2160 | * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), | |
2161 | * supp_rates[] does not; shift to convert format, force 9 MBits off. | |
2162 | */ | |
270243a5 RR |
2163 | crl->active_siso_rate = (priv->current_ht_config.supp_mcs_set[0] << 1); |
2164 | crl->active_siso_rate |= | |
2165 | (priv->current_ht_config.supp_mcs_set[0] & 0x1); | |
b481de9c ZY |
2166 | crl->active_siso_rate &= ~((u16)0x2); |
2167 | crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE; | |
2168 | ||
77626355 | 2169 | /* Same here */ |
270243a5 RR |
2170 | crl->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1); |
2171 | crl->active_mimo_rate |= | |
2172 | (priv->current_ht_config.supp_mcs_set[1] & 0x1); | |
b481de9c ZY |
2173 | crl->active_mimo_rate &= ~((u16)0x2); |
2174 | crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE; | |
2175 | IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate, | |
2176 | crl->active_mimo_rate); | |
c8b0e6e1 | 2177 | #endif /*CONFIG_IWL4965_HT*/ |
98d7e09a ZY |
2178 | #ifdef CONFIG_MAC80211_DEBUGFS |
2179 | crl->drv = priv; | |
2180 | #endif | |
b481de9c ZY |
2181 | |
2182 | if (priv->assoc_station_added) | |
2183 | priv->lq_mngr.lq_ready = 1; | |
2184 | ||
270243a5 | 2185 | rs_initialize_lq(priv, conf, sta); |
b481de9c ZY |
2186 | } |
2187 | ||
bb8c093b CH |
2188 | static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data, |
2189 | struct iwl4965_rate *tx_mcs, | |
2190 | struct iwl4965_link_quality_cmd *lq_cmd) | |
b481de9c ZY |
2191 | { |
2192 | int index = 0; | |
b481de9c | 2193 | int rate_idx; |
1b696de2 | 2194 | int repeat_rate = 0; |
b481de9c ZY |
2195 | u8 ant_toggle_count = 0; |
2196 | u8 use_ht_possible = 1; | |
bb8c093b CH |
2197 | struct iwl4965_rate new_rate; |
2198 | struct iwl4965_scale_tbl_info tbl_type = { 0 }; | |
b481de9c | 2199 | |
77626355 | 2200 | /* Override starting rate (index 0) if needed for debug purposes */ |
98d7e09a ZY |
2201 | rs_dbgfs_set_mcs(lq_data, tx_mcs, index); |
2202 | ||
77626355 | 2203 | /* Interpret rate_n_flags */ |
b481de9c ZY |
2204 | rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode, |
2205 | &tbl_type, &rate_idx); | |
2206 | ||
77626355 | 2207 | /* How many times should we repeat the initial rate? */ |
b481de9c ZY |
2208 | if (is_legacy(tbl_type.lq_type)) { |
2209 | ant_toggle_count = 1; | |
1b696de2 | 2210 | repeat_rate = IWL_NUMBER_TRY; |
b481de9c | 2211 | } else |
1b696de2 | 2212 | repeat_rate = IWL_HT_NUMBER_TRY; |
b481de9c ZY |
2213 | |
2214 | lq_cmd->general_params.mimo_delimiter = | |
2215 | is_mimo(tbl_type.lq_type) ? 1 : 0; | |
77626355 BC |
2216 | |
2217 | /* Fill 1st table entry (index 0) */ | |
b481de9c ZY |
2218 | lq_cmd->rs_table[index].rate_n_flags = |
2219 | cpu_to_le32(tx_mcs->rate_n_flags); | |
2220 | new_rate.rate_n_flags = tx_mcs->rate_n_flags; | |
2221 | ||
2222 | if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN)) | |
77626355 BC |
2223 | lq_cmd->general_params.single_stream_ant_msk |
2224 | = LINK_QUAL_ANT_A_MSK; | |
b481de9c | 2225 | else |
77626355 BC |
2226 | lq_cmd->general_params.single_stream_ant_msk |
2227 | = LINK_QUAL_ANT_B_MSK; | |
b481de9c ZY |
2228 | |
2229 | index++; | |
1b696de2 | 2230 | repeat_rate--; |
b481de9c | 2231 | |
77626355 | 2232 | /* Fill rest of rate table */ |
b481de9c | 2233 | while (index < LINK_QUAL_MAX_RETRY_NUM) { |
77626355 BC |
2234 | /* Repeat initial/next rate. |
2235 | * For legacy IWL_NUMBER_TRY == 1, this loop will not execute. | |
2236 | * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */ | |
1b696de2 | 2237 | while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) { |
b481de9c ZY |
2238 | if (is_legacy(tbl_type.lq_type)) { |
2239 | if (ant_toggle_count < | |
2240 | NUM_TRY_BEFORE_ANTENNA_TOGGLE) | |
2241 | ant_toggle_count++; | |
2242 | else { | |
2243 | rs_toggle_antenna(&new_rate, &tbl_type); | |
2244 | ant_toggle_count = 1; | |
2245 | } | |
2246 | } | |
98d7e09a | 2247 | |
77626355 | 2248 | /* Override next rate if needed for debug purposes */ |
98d7e09a | 2249 | rs_dbgfs_set_mcs(lq_data, &new_rate, index); |
77626355 BC |
2250 | |
2251 | /* Fill next table entry */ | |
b481de9c ZY |
2252 | lq_cmd->rs_table[index].rate_n_flags = |
2253 | cpu_to_le32(new_rate.rate_n_flags); | |
1b696de2 | 2254 | repeat_rate--; |
b481de9c ZY |
2255 | index++; |
2256 | } | |
2257 | ||
2258 | rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type, | |
2259 | &rate_idx); | |
2260 | ||
77626355 BC |
2261 | /* Indicate to uCode which entries might be MIMO. |
2262 | * If initial rate was MIMO, this will finally end up | |
2263 | * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ | |
b481de9c ZY |
2264 | if (is_mimo(tbl_type.lq_type)) |
2265 | lq_cmd->general_params.mimo_delimiter = index; | |
2266 | ||
77626355 | 2267 | /* Get next rate */ |
b481de9c | 2268 | rs_get_lower_rate(lq_data, &tbl_type, rate_idx, |
02dede04 | 2269 | use_ht_possible, &new_rate); |
b481de9c | 2270 | |
77626355 | 2271 | /* How many times should we repeat the next rate? */ |
b481de9c ZY |
2272 | if (is_legacy(tbl_type.lq_type)) { |
2273 | if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE) | |
2274 | ant_toggle_count++; | |
2275 | else { | |
2276 | rs_toggle_antenna(&new_rate, &tbl_type); | |
2277 | ant_toggle_count = 1; | |
2278 | } | |
1b696de2 | 2279 | repeat_rate = IWL_NUMBER_TRY; |
b481de9c | 2280 | } else |
1b696de2 | 2281 | repeat_rate = IWL_HT_NUMBER_TRY; |
b481de9c | 2282 | |
77626355 BC |
2283 | /* Don't allow HT rates after next pass. |
2284 | * rs_get_lower_rate() will change type to LQ_A or LQ_G. */ | |
b481de9c ZY |
2285 | use_ht_possible = 0; |
2286 | ||
77626355 | 2287 | /* Override next rate if needed for debug purposes */ |
98d7e09a | 2288 | rs_dbgfs_set_mcs(lq_data, &new_rate, index); |
77626355 BC |
2289 | |
2290 | /* Fill next table entry */ | |
b481de9c ZY |
2291 | lq_cmd->rs_table[index].rate_n_flags = |
2292 | cpu_to_le32(new_rate.rate_n_flags); | |
b481de9c ZY |
2293 | |
2294 | index++; | |
1b696de2 | 2295 | repeat_rate--; |
b481de9c ZY |
2296 | } |
2297 | ||
b481de9c ZY |
2298 | lq_cmd->general_params.dual_stream_ant_msk = 3; |
2299 | lq_cmd->agg_params.agg_dis_start_th = 3; | |
2300 | lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000); | |
b481de9c ZY |
2301 | } |
2302 | ||
2303 | static void *rs_alloc(struct ieee80211_local *local) | |
2304 | { | |
2305 | return local->hw.priv; | |
2306 | } | |
2307 | /* rate scale requires free function to be implemented */ | |
2308 | static void rs_free(void *priv_rate) | |
2309 | { | |
2310 | return; | |
2311 | } | |
2312 | ||
2313 | static void rs_clear(void *priv_rate) | |
2314 | { | |
bb8c093b | 2315 | struct iwl4965_priv *priv = (struct iwl4965_priv *) priv_rate; |
b481de9c ZY |
2316 | |
2317 | IWL_DEBUG_RATE("enter\n"); | |
2318 | ||
2319 | priv->lq_mngr.lq_ready = 0; | |
c8b0e6e1 CH |
2320 | #ifdef CONFIG_IWL4965_HT |
2321 | #ifdef CONFIG_IWL4965_HT_AGG | |
b481de9c ZY |
2322 | if (priv->lq_mngr.agg_ctrl.granted_ba) |
2323 | iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED); | |
c8b0e6e1 CH |
2324 | #endif /*CONFIG_IWL4965_HT_AGG */ |
2325 | #endif /* CONFIG_IWL4965_HT */ | |
b481de9c ZY |
2326 | |
2327 | IWL_DEBUG_RATE("leave\n"); | |
2328 | } | |
2329 | ||
2330 | static void rs_free_sta(void *priv, void *priv_sta) | |
2331 | { | |
bb8c093b | 2332 | struct iwl4965_rate_scale_priv *rs_priv = priv_sta; |
b481de9c ZY |
2333 | |
2334 | IWL_DEBUG_RATE("enter\n"); | |
2335 | kfree(rs_priv); | |
2336 | IWL_DEBUG_RATE("leave\n"); | |
2337 | } | |
2338 | ||
2339 | ||
93dc646a | 2340 | #ifdef CONFIG_MAC80211_DEBUGFS |
5ae212c9 ZY |
2341 | static int open_file_generic(struct inode *inode, struct file *file) |
2342 | { | |
2343 | file->private_data = inode->i_private; | |
2344 | return 0; | |
2345 | } | |
bb8c093b CH |
2346 | static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv, |
2347 | struct iwl4965_rate *mcs, int index) | |
98d7e09a | 2348 | { |
4457e1a4 RR |
2349 | u32 base_rate; |
2350 | ||
2351 | if (rs_priv->phymode == (u8) MODE_IEEE80211A) | |
2352 | base_rate = 0x800D; | |
2353 | else | |
2354 | base_rate = 0x820A; | |
2355 | ||
98d7e09a ZY |
2356 | if (rs_priv->dbg_fixed.rate_n_flags) { |
2357 | if (index < 12) | |
2358 | mcs->rate_n_flags = rs_priv->dbg_fixed.rate_n_flags; | |
2359 | else | |
4457e1a4 | 2360 | mcs->rate_n_flags = base_rate; |
98d7e09a ZY |
2361 | IWL_DEBUG_RATE("Fixed rate ON\n"); |
2362 | return; | |
2363 | } | |
2364 | ||
2365 | IWL_DEBUG_RATE("Fixed rate OFF\n"); | |
2366 | } | |
5ae212c9 | 2367 | |
98d7e09a ZY |
2368 | static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, |
2369 | const char __user *user_buf, size_t count, loff_t *ppos) | |
2370 | { | |
bb8c093b | 2371 | struct iwl4965_rate_scale_priv *rs_priv = file->private_data; |
98d7e09a ZY |
2372 | char buf[64]; |
2373 | int buf_size; | |
2374 | u32 parsed_rate; | |
2375 | ||
2376 | memset(buf, 0, sizeof(buf)); | |
2377 | buf_size = min(count, sizeof(buf) - 1); | |
2378 | if (copy_from_user(buf, user_buf, buf_size)) | |
2379 | return -EFAULT; | |
2380 | ||
2381 | if (sscanf(buf, "%x", &parsed_rate) == 1) | |
2382 | rs_priv->dbg_fixed.rate_n_flags = parsed_rate; | |
2383 | else | |
2384 | rs_priv->dbg_fixed.rate_n_flags = 0; | |
2385 | ||
77626355 BC |
2386 | rs_priv->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ |
2387 | rs_priv->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ | |
2388 | rs_priv->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ | |
98d7e09a ZY |
2389 | |
2390 | IWL_DEBUG_RATE("sta_id %d rate 0x%X\n", | |
2391 | rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags); | |
2392 | ||
2393 | if (rs_priv->dbg_fixed.rate_n_flags) { | |
2394 | rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq); | |
2395 | rs_send_lq_cmd(rs_priv->drv, &rs_priv->lq, CMD_ASYNC); | |
2396 | } | |
2397 | ||
2398 | return count; | |
2399 | } | |
0209dc11 | 2400 | |
5ae212c9 ZY |
2401 | static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, |
2402 | char __user *user_buf, size_t count, loff_t *ppos) | |
2403 | { | |
2404 | char buff[1024]; | |
2405 | int desc = 0; | |
2406 | int i = 0; | |
2407 | ||
bb8c093b | 2408 | struct iwl4965_rate_scale_priv *rs_priv = file->private_data; |
5ae212c9 ZY |
2409 | |
2410 | desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id); | |
98d7e09a | 2411 | desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n", |
5ae212c9 ZY |
2412 | rs_priv->total_failed, rs_priv->total_success, |
2413 | rs_priv->active_rate); | |
98d7e09a ZY |
2414 | desc += sprintf(buff+desc, "fixed rate 0x%X\n", |
2415 | rs_priv->dbg_fixed.rate_n_flags); | |
5ae212c9 ZY |
2416 | desc += sprintf(buff+desc, "general:" |
2417 | "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", | |
2418 | rs_priv->lq.general_params.flags, | |
2419 | rs_priv->lq.general_params.mimo_delimiter, | |
2420 | rs_priv->lq.general_params.single_stream_ant_msk, | |
2421 | rs_priv->lq.general_params.dual_stream_ant_msk); | |
2422 | ||
2423 | desc += sprintf(buff+desc, "agg:" | |
2424 | "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", | |
2425 | le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit), | |
2426 | rs_priv->lq.agg_params.agg_dis_start_th, | |
2427 | rs_priv->lq.agg_params.agg_frame_cnt_limit); | |
2428 | ||
2429 | desc += sprintf(buff+desc, | |
2430 | "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", | |
2431 | rs_priv->lq.general_params.start_rate_index[0], | |
2432 | rs_priv->lq.general_params.start_rate_index[1], | |
2433 | rs_priv->lq.general_params.start_rate_index[2], | |
2434 | rs_priv->lq.general_params.start_rate_index[3]); | |
2435 | ||
2436 | ||
2437 | for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) | |
2438 | desc += sprintf(buff+desc, " rate[%d] 0x%X\n", | |
2439 | i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags)); | |
2440 | ||
2441 | return simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
2442 | } | |
2443 | ||
2444 | static const struct file_operations rs_sta_dbgfs_scale_table_ops = { | |
98d7e09a | 2445 | .write = rs_sta_dbgfs_scale_table_write, |
5ae212c9 ZY |
2446 | .read = rs_sta_dbgfs_scale_table_read, |
2447 | .open = open_file_generic, | |
2448 | }; | |
0209dc11 ZY |
2449 | static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, |
2450 | char __user *user_buf, size_t count, loff_t *ppos) | |
2451 | { | |
2452 | char buff[1024]; | |
2453 | int desc = 0; | |
2454 | int i, j; | |
2455 | ||
bb8c093b | 2456 | struct iwl4965_rate_scale_priv *rs_priv = file->private_data; |
0209dc11 ZY |
2457 | for (i = 0; i < LQ_SIZE; i++) { |
2458 | desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n" | |
2459 | "rate=0x%X\n", | |
2460 | rs_priv->active_tbl == i?"*":"x", | |
2461 | rs_priv->lq_info[i].lq_type, | |
2462 | rs_priv->lq_info[i].is_SGI, | |
2463 | rs_priv->lq_info[i].is_fat, | |
2464 | rs_priv->lq_info[i].is_dup, | |
2465 | rs_priv->lq_info[i].current_rate.rate_n_flags); | |
2466 | for (j = 0; j < IWL_RATE_COUNT; j++) { | |
2467 | desc += sprintf(buff+desc, | |
2468 | "counter=%d success=%d %%=%d\n", | |
2469 | rs_priv->lq_info[i].win[j].counter, | |
2470 | rs_priv->lq_info[i].win[j].success_counter, | |
2471 | rs_priv->lq_info[i].win[j].success_ratio); | |
2472 | } | |
2473 | } | |
2474 | return simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
2475 | } | |
2476 | ||
2477 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
2478 | .read = rs_sta_dbgfs_stats_table_read, | |
2479 | .open = open_file_generic, | |
2480 | }; | |
5ae212c9 | 2481 | |
93dc646a ZY |
2482 | static void rs_add_debugfs(void *priv, void *priv_sta, |
2483 | struct dentry *dir) | |
2484 | { | |
bb8c093b | 2485 | struct iwl4965_rate_scale_priv *rs_priv = priv_sta; |
5ae212c9 | 2486 | rs_priv->rs_sta_dbgfs_scale_table_file = |
0209dc11 | 2487 | debugfs_create_file("rate_scale_table", 0600, dir, |
5ae212c9 | 2488 | rs_priv, &rs_sta_dbgfs_scale_table_ops); |
0209dc11 ZY |
2489 | rs_priv->rs_sta_dbgfs_stats_table_file = |
2490 | debugfs_create_file("rate_stats_table", 0600, dir, | |
2491 | rs_priv, &rs_sta_dbgfs_stats_table_ops); | |
93dc646a ZY |
2492 | } |
2493 | ||
2494 | static void rs_remove_debugfs(void *priv, void *priv_sta) | |
2495 | { | |
bb8c093b | 2496 | struct iwl4965_rate_scale_priv *rs_priv = priv_sta; |
5ae212c9 | 2497 | debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file); |
0209dc11 | 2498 | debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_file); |
93dc646a ZY |
2499 | } |
2500 | #endif | |
2501 | ||
b481de9c ZY |
2502 | static struct rate_control_ops rs_ops = { |
2503 | .module = NULL, | |
2504 | .name = RS_NAME, | |
2505 | .tx_status = rs_tx_status, | |
2506 | .get_rate = rs_get_rate, | |
2507 | .rate_init = rs_rate_init, | |
2508 | .clear = rs_clear, | |
2509 | .alloc = rs_alloc, | |
2510 | .free = rs_free, | |
2511 | .alloc_sta = rs_alloc_sta, | |
2512 | .free_sta = rs_free_sta, | |
93dc646a ZY |
2513 | #ifdef CONFIG_MAC80211_DEBUGFS |
2514 | .add_sta_debugfs = rs_add_debugfs, | |
2515 | .remove_sta_debugfs = rs_remove_debugfs, | |
2516 | #endif | |
b481de9c ZY |
2517 | }; |
2518 | ||
bb8c093b | 2519 | int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id) |
b481de9c ZY |
2520 | { |
2521 | struct ieee80211_local *local = hw_to_local(hw); | |
bb8c093b CH |
2522 | struct iwl4965_priv *priv = hw->priv; |
2523 | struct iwl4965_rate_scale_priv *rs_priv; | |
b481de9c ZY |
2524 | struct sta_info *sta; |
2525 | int count = 0, i; | |
2526 | u32 samples = 0, success = 0, good = 0; | |
2527 | unsigned long now = jiffies; | |
2528 | u32 max_time = 0; | |
2529 | u8 lq_type, antenna; | |
2530 | ||
2531 | sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr); | |
2532 | if (!sta || !sta->rate_ctrl_priv) { | |
2533 | if (sta) { | |
2534 | sta_info_put(sta); | |
2535 | IWL_DEBUG_RATE("leave - no private rate data!\n"); | |
2536 | } else | |
2537 | IWL_DEBUG_RATE("leave - no station!\n"); | |
2538 | return sprintf(buf, "station %d not found\n", sta_id); | |
2539 | } | |
2540 | ||
2541 | rs_priv = (void *)sta->rate_ctrl_priv; | |
2542 | ||
2543 | lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type; | |
2544 | antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type; | |
2545 | ||
2546 | if (is_legacy(lq_type)) | |
2547 | i = IWL_RATE_54M_INDEX; | |
2548 | else | |
2549 | i = IWL_RATE_60M_INDEX; | |
2550 | while (1) { | |
2551 | u64 mask; | |
2552 | int j; | |
2553 | int active = rs_priv->active_tbl; | |
2554 | ||
2555 | count += | |
bb8c093b | 2556 | sprintf(&buf[count], " %2dMbs: ", iwl4965_rates[i].ieee / 2); |
b481de9c ZY |
2557 | |
2558 | mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1)); | |
2559 | for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1) | |
2560 | buf[count++] = | |
2561 | (rs_priv->lq_info[active].win[i].data & mask) | |
2562 | ? '1' : '0'; | |
2563 | ||
2564 | samples += rs_priv->lq_info[active].win[i].counter; | |
2565 | good += rs_priv->lq_info[active].win[i].success_counter; | |
2566 | success += rs_priv->lq_info[active].win[i].success_counter * | |
bb8c093b | 2567 | iwl4965_rates[i].ieee; |
b481de9c ZY |
2568 | |
2569 | if (rs_priv->lq_info[active].win[i].stamp) { | |
2570 | int delta = | |
2571 | jiffies_to_msecs(now - | |
2572 | rs_priv->lq_info[active].win[i].stamp); | |
2573 | ||
2574 | if (delta > max_time) | |
2575 | max_time = delta; | |
2576 | ||
2577 | count += sprintf(&buf[count], "%5dms\n", delta); | |
2578 | } else | |
2579 | buf[count++] = '\n'; | |
2580 | ||
bb8c093b | 2581 | j = iwl4965_get_prev_ieee_rate(i); |
b481de9c ZY |
2582 | if (j == i) |
2583 | break; | |
2584 | i = j; | |
2585 | } | |
2586 | ||
2587 | /* Display the average rate of all samples taken. | |
2588 | * | |
77626355 | 2589 | * NOTE: We multiply # of samples by 2 since the IEEE measurement |
bb8c093b | 2590 | * added from iwl4965_rates is actually 2X the rate */ |
b481de9c ZY |
2591 | if (samples) |
2592 | count += sprintf(&buf[count], | |
2593 | "\nAverage rate is %3d.%02dMbs over last %4dms\n" | |
2594 | "%3d%% success (%d good packets over %d tries)\n", | |
2595 | success / (2 * samples), (success * 5 / samples) % 10, | |
2596 | max_time, good * 100 / samples, good, samples); | |
2597 | else | |
2598 | count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n"); | |
01ebd063 | 2599 | count += sprintf(&buf[count], "\nrate scale type %d antenna %d " |
b481de9c ZY |
2600 | "active_search %d rate index %d\n", lq_type, antenna, |
2601 | rs_priv->search_better_tbl, sta->last_txrate); | |
2602 | ||
2603 | sta_info_put(sta); | |
2604 | return count; | |
2605 | } | |
2606 | ||
bb8c093b | 2607 | void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
b481de9c | 2608 | { |
bb8c093b | 2609 | struct iwl4965_priv *priv = hw->priv; |
b481de9c ZY |
2610 | |
2611 | priv->lq_mngr.lq_ready = 1; | |
2612 | } | |
2613 | ||
bb8c093b | 2614 | void iwl4965_rate_control_register(struct ieee80211_hw *hw) |
b481de9c ZY |
2615 | { |
2616 | ieee80211_rate_control_register(&rs_ops); | |
2617 | } | |
2618 | ||
bb8c093b | 2619 | void iwl4965_rate_control_unregister(struct ieee80211_hw *hw) |
b481de9c ZY |
2620 | { |
2621 | ieee80211_rate_control_unregister(&rs_ops); | |
2622 | } | |
2623 |