1 /*
2  * Copyright (c) 2010 Broadcom Corporation
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 
19 #include <proto/802.11.h>
20 #include <bcmdefs.h>
21 #include <bcmutils.h>
22 #include <siutils.h>
23 #include <wlioctl.h>
24 #include <sbhnddma.h>
25 
26 #include "wlc_types.h"
27 #include "d11.h"
28 #include "wl_dbg.h"
29 #include "wlc_cfg.h"
30 #include "wlc_scb.h"
31 #include "wlc_pub.h"
32 #include "wlc_rate.h"
33 
34 /* Rate info per rate: It tells whether a rate is ofdm or not and its phy_rate value */
35 const u8 rate_info[WLC_MAXRATE + 1] = {
36 	/*  0     1     2     3     4     5     6     7     8     9 */
37 /*   0 */ 0x00, 0x00, 0x0a, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00,
38 /*  10 */ 0x00, 0x37, 0x8b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8f, 0x00,
39 /*  20 */ 0x00, 0x00, 0x6e, 0x00, 0x8a, 0x00, 0x00, 0x00, 0x00, 0x00,
40 /*  30 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8e, 0x00, 0x00, 0x00,
41 /*  40 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x89, 0x00,
42 /*  50 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
43 /*  60 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
44 /*  70 */ 0x00, 0x00, 0x8d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
45 /*  80 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46 /*  90 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x00, 0x00, 0x00,
47 /* 100 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8c
48 };
49 
50 /* rates are in units of Kbps */
51 const mcs_info_t mcs_table[MCS_TABLE_SIZE] = {
52 	/* MCS  0: SS 1, MOD: BPSK,  CR 1/2 */
53 	{6500, 13500, CEIL(6500 * 10, 9), CEIL(13500 * 10, 9), 0x00,
54 	 WLC_RATE_6M},
55 	/* MCS  1: SS 1, MOD: QPSK,  CR 1/2 */
56 	{13000, 27000, CEIL(13000 * 10, 9), CEIL(27000 * 10, 9), 0x08,
57 	 WLC_RATE_12M},
58 	/* MCS  2: SS 1, MOD: QPSK,  CR 3/4 */
59 	{19500, 40500, CEIL(19500 * 10, 9), CEIL(40500 * 10, 9), 0x0A,
60 	 WLC_RATE_18M},
61 	/* MCS  3: SS 1, MOD: 16QAM, CR 1/2 */
62 	{26000, 54000, CEIL(26000 * 10, 9), CEIL(54000 * 10, 9), 0x10,
63 	 WLC_RATE_24M},
64 	/* MCS  4: SS 1, MOD: 16QAM, CR 3/4 */
65 	{39000, 81000, CEIL(39000 * 10, 9), CEIL(81000 * 10, 9), 0x12,
66 	 WLC_RATE_36M},
67 	/* MCS  5: SS 1, MOD: 64QAM, CR 2/3 */
68 	{52000, 108000, CEIL(52000 * 10, 9), CEIL(108000 * 10, 9), 0x19,
69 	 WLC_RATE_48M},
70 	/* MCS  6: SS 1, MOD: 64QAM, CR 3/4 */
71 	{58500, 121500, CEIL(58500 * 10, 9), CEIL(121500 * 10, 9), 0x1A,
72 	 WLC_RATE_54M},
73 	/* MCS  7: SS 1, MOD: 64QAM, CR 5/6 */
74 	{65000, 135000, CEIL(65000 * 10, 9), CEIL(135000 * 10, 9), 0x1C,
75 	 WLC_RATE_54M},
76 	/* MCS  8: SS 2, MOD: BPSK,  CR 1/2 */
77 	{13000, 27000, CEIL(13000 * 10, 9), CEIL(27000 * 10, 9), 0x40,
78 	 WLC_RATE_6M},
79 	/* MCS  9: SS 2, MOD: QPSK,  CR 1/2 */
80 	{26000, 54000, CEIL(26000 * 10, 9), CEIL(54000 * 10, 9), 0x48,
81 	 WLC_RATE_12M},
82 	/* MCS 10: SS 2, MOD: QPSK,  CR 3/4 */
83 	{39000, 81000, CEIL(39000 * 10, 9), CEIL(81000 * 10, 9), 0x4A,
84 	 WLC_RATE_18M},
85 	/* MCS 11: SS 2, MOD: 16QAM, CR 1/2 */
86 	{52000, 108000, CEIL(52000 * 10, 9), CEIL(108000 * 10, 9), 0x50,
87 	 WLC_RATE_24M},
88 	/* MCS 12: SS 2, MOD: 16QAM, CR 3/4 */
89 	{78000, 162000, CEIL(78000 * 10, 9), CEIL(162000 * 10, 9), 0x52,
90 	 WLC_RATE_36M},
91 	/* MCS 13: SS 2, MOD: 64QAM, CR 2/3 */
92 	{104000, 216000, CEIL(104000 * 10, 9), CEIL(216000 * 10, 9), 0x59,
93 	 WLC_RATE_48M},
94 	/* MCS 14: SS 2, MOD: 64QAM, CR 3/4 */
95 	{117000, 243000, CEIL(117000 * 10, 9), CEIL(243000 * 10, 9), 0x5A,
96 	 WLC_RATE_54M},
97 	/* MCS 15: SS 2, MOD: 64QAM, CR 5/6 */
98 	{130000, 270000, CEIL(130000 * 10, 9), CEIL(270000 * 10, 9), 0x5C,
99 	 WLC_RATE_54M},
100 	/* MCS 16: SS 3, MOD: BPSK,  CR 1/2 */
101 	{19500, 40500, CEIL(19500 * 10, 9), CEIL(40500 * 10, 9), 0x80,
102 	 WLC_RATE_6M},
103 	/* MCS 17: SS 3, MOD: QPSK,  CR 1/2 */
104 	{39000, 81000, CEIL(39000 * 10, 9), CEIL(81000 * 10, 9), 0x88,
105 	 WLC_RATE_12M},
106 	/* MCS 18: SS 3, MOD: QPSK,  CR 3/4 */
107 	{58500, 121500, CEIL(58500 * 10, 9), CEIL(121500 * 10, 9), 0x8A,
108 	 WLC_RATE_18M},
109 	/* MCS 19: SS 3, MOD: 16QAM, CR 1/2 */
110 	{78000, 162000, CEIL(78000 * 10, 9), CEIL(162000 * 10, 9), 0x90,
111 	 WLC_RATE_24M},
112 	/* MCS 20: SS 3, MOD: 16QAM, CR 3/4 */
113 	{117000, 243000, CEIL(117000 * 10, 9), CEIL(243000 * 10, 9), 0x92,
114 	 WLC_RATE_36M},
115 	/* MCS 21: SS 3, MOD: 64QAM, CR 2/3 */
116 	{156000, 324000, CEIL(156000 * 10, 9), CEIL(324000 * 10, 9), 0x99,
117 	 WLC_RATE_48M},
118 	/* MCS 22: SS 3, MOD: 64QAM, CR 3/4 */
119 	{175500, 364500, CEIL(175500 * 10, 9), CEIL(364500 * 10, 9), 0x9A,
120 	 WLC_RATE_54M},
121 	/* MCS 23: SS 3, MOD: 64QAM, CR 5/6 */
122 	{195000, 405000, CEIL(195000 * 10, 9), CEIL(405000 * 10, 9), 0x9B,
123 	 WLC_RATE_54M},
124 	/* MCS 24: SS 4, MOD: BPSK,  CR 1/2 */
125 	{26000, 54000, CEIL(26000 * 10, 9), CEIL(54000 * 10, 9), 0xC0,
126 	 WLC_RATE_6M},
127 	/* MCS 25: SS 4, MOD: QPSK,  CR 1/2 */
128 	{52000, 108000, CEIL(52000 * 10, 9), CEIL(108000 * 10, 9), 0xC8,
129 	 WLC_RATE_12M},
130 	/* MCS 26: SS 4, MOD: QPSK,  CR 3/4 */
131 	{78000, 162000, CEIL(78000 * 10, 9), CEIL(162000 * 10, 9), 0xCA,
132 	 WLC_RATE_18M},
133 	/* MCS 27: SS 4, MOD: 16QAM, CR 1/2 */
134 	{104000, 216000, CEIL(104000 * 10, 9), CEIL(216000 * 10, 9), 0xD0,
135 	 WLC_RATE_24M},
136 	/* MCS 28: SS 4, MOD: 16QAM, CR 3/4 */
137 	{156000, 324000, CEIL(156000 * 10, 9), CEIL(324000 * 10, 9), 0xD2,
138 	 WLC_RATE_36M},
139 	/* MCS 29: SS 4, MOD: 64QAM, CR 2/3 */
140 	{208000, 432000, CEIL(208000 * 10, 9), CEIL(432000 * 10, 9), 0xD9,
141 	 WLC_RATE_48M},
142 	/* MCS 30: SS 4, MOD: 64QAM, CR 3/4 */
143 	{234000, 486000, CEIL(234000 * 10, 9), CEIL(486000 * 10, 9), 0xDA,
144 	 WLC_RATE_54M},
145 	/* MCS 31: SS 4, MOD: 64QAM, CR 5/6 */
146 	{260000, 540000, CEIL(260000 * 10, 9), CEIL(540000 * 10, 9), 0xDB,
147 	 WLC_RATE_54M},
148 	/* MCS 32: SS 1, MOD: BPSK,  CR 1/2 */
149 	{0, 6000, 0, CEIL(6000 * 10, 9), 0x00, WLC_RATE_6M},
150 };
151 
152 /* phycfg for legacy OFDM frames: code rate, modulation scheme, spatial streams
153  *   Number of spatial streams: always 1
154  *   other fields: refer to table 78 of section 17.3.2.2 of the original .11a standard
155  */
156 typedef struct legacy_phycfg {
157 	u32 rate_ofdm;	/* ofdm mac rate */
158 	u8 tx_phy_ctl3;	/* phy ctl byte 3, code rate, modulation type, # of streams */
159 } legacy_phycfg_t;
160 
161 #define LEGACY_PHYCFG_TABLE_SIZE	12	/* Number of legacy_rate_cfg entries in the table */
162 
163 /* In CCK mode LPPHY overloads OFDM Modulation bits with CCK Data Rate */
164 /* Eventually MIMOPHY would also be converted to this format */
165 /* 0 = 1Mbps; 1 = 2Mbps; 2 = 5.5Mbps; 3 = 11Mbps */
166 static const legacy_phycfg_t legacy_phycfg_table[LEGACY_PHYCFG_TABLE_SIZE] = {
167 	{WLC_RATE_1M, 0x00},	/* CCK  1Mbps,  data rate  0 */
168 	{WLC_RATE_2M, 0x08},	/* CCK  2Mbps,  data rate  1 */
169 	{WLC_RATE_5M5, 0x10},	/* CCK  5.5Mbps,  data rate  2 */
170 	{WLC_RATE_11M, 0x18},	/* CCK  11Mbps,  data rate   3 */
171 	{WLC_RATE_6M, 0x00},	/* OFDM  6Mbps,  code rate 1/2, BPSK,   1 spatial stream */
172 	{WLC_RATE_9M, 0x02},	/* OFDM  9Mbps,  code rate 3/4, BPSK,   1 spatial stream */
173 	{WLC_RATE_12M, 0x08},	/* OFDM  12Mbps, code rate 1/2, QPSK,   1 spatial stream */
174 	{WLC_RATE_18M, 0x0A},	/* OFDM  18Mbps, code rate 3/4, QPSK,   1 spatial stream */
175 	{WLC_RATE_24M, 0x10},	/* OFDM  24Mbps, code rate 1/2, 16-QAM, 1 spatial stream */
176 	{WLC_RATE_36M, 0x12},	/* OFDM  36Mbps, code rate 3/4, 16-QAM, 1 spatial stream */
177 	{WLC_RATE_48M, 0x19},	/* OFDM  48Mbps, code rate 2/3, 64-QAM, 1 spatial stream */
178 	{WLC_RATE_54M, 0x1A},	/* OFDM  54Mbps, code rate 3/4, 64-QAM, 1 spatial stream */
179 };
180 
181 /* Hardware rates (also encodes default basic rates) */
182 
183 const wlc_rateset_t cck_ofdm_mimo_rates = {
184 	12,
185 	{			/*    1b,   2b,   5.5b, 6,    9,    11b,  12,   18,   24,   36,   48,   54 Mbps */
186 	 0x82, 0x84, 0x8b, 0x0c, 0x12, 0x96, 0x18, 0x24, 0x30, 0x48, 0x60,
187 	 0x6c},
188 	0x00,
189 	{0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
190 	 0x00, 0x00, 0x00, 0x00}
191 };
192 
193 const wlc_rateset_t ofdm_mimo_rates = {
194 	8,
195 	{			/*    6b,   9,    12b,  18,   24b,  36,   48,   54 Mbps */
196 	 0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c},
197 	0x00,
198 	{0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
199 	 0x00, 0x00, 0x00, 0x00}
200 };
201 
202 /* Default ratesets that include MCS32 for 40BW channels */
203 const wlc_rateset_t cck_ofdm_40bw_mimo_rates = {
204 	12,
205 	{			/*    1b,   2b,   5.5b, 6,    9,    11b,  12,   18,   24,   36,   48,   54 Mbps */
206 	 0x82, 0x84, 0x8b, 0x0c, 0x12, 0x96, 0x18, 0x24, 0x30, 0x48, 0x60,
207 	 0x6c},
208 	0x00,
209 	{0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
210 	 0x00, 0x00, 0x00, 0x00}
211 };
212 
213 const wlc_rateset_t ofdm_40bw_mimo_rates = {
214 	8,
215 	{			/*    6b,   9,    12b,  18,   24b,  36,   48,   54 Mbps */
216 	 0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c},
217 	0x00,
218 	{0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
219 	 0x00, 0x00, 0x00, 0x00}
220 };
221 
222 const wlc_rateset_t cck_ofdm_rates = {
223 	12,
224 	{			/*    1b,   2b,   5.5b, 6,    9,    11b,  12,   18,   24,   36,   48,   54 Mbps */
225 	 0x82, 0x84, 0x8b, 0x0c, 0x12, 0x96, 0x18, 0x24, 0x30, 0x48, 0x60,
226 	 0x6c},
227 	0x00,
228 	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
229 	 0x00, 0x00, 0x00, 0x00}
230 };
231 
232 const wlc_rateset_t gphy_legacy_rates = {
233 	4,
234 	{			/*    1b,   2b,   5.5b,  11b Mbps */
235 	 0x82, 0x84, 0x8b, 0x96},
236 	0x00,
237 	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
238 	 0x00, 0x00, 0x00, 0x00}
239 };
240 
241 const wlc_rateset_t ofdm_rates = {
242 	8,
243 	{			/*    6b,   9,    12b,  18,   24b,  36,   48,   54 Mbps */
244 	 0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c},
245 	0x00,
246 	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
247 	 0x00, 0x00, 0x00, 0x00}
248 };
249 
250 const wlc_rateset_t cck_rates = {
251 	4,
252 	{			/*    1b,   2b,   5.5,  11 Mbps */
253 	 0x82, 0x84, 0x0b, 0x16},
254 	0x00,
255 	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
256 	 0x00, 0x00, 0x00, 0x00}
257 };
258 
259 static bool wlc_rateset_valid(wlc_rateset_t *rs, bool check_brate);
260 
261 /* check if rateset is valid.
262  * if check_brate is true, rateset without a basic rate is considered NOT valid.
263  */
wlc_rateset_valid(wlc_rateset_t * rs,bool check_brate)264 static bool wlc_rateset_valid(wlc_rateset_t *rs, bool check_brate)
265 {
266 	uint idx;
267 
268 	if (!rs->count)
269 		return false;
270 
271 	if (!check_brate)
272 		return true;
273 
274 	/* error if no basic rates */
275 	for (idx = 0; idx < rs->count; idx++) {
276 		if (rs->rates[idx] & WLC_RATE_FLAG)
277 			return true;
278 	}
279 	return false;
280 }
281 
wlc_rateset_mcs_upd(wlc_rateset_t * rs,u8 txstreams)282 void wlc_rateset_mcs_upd(wlc_rateset_t *rs, u8 txstreams)
283 {
284 	int i;
285 	for (i = txstreams; i < MAX_STREAMS_SUPPORTED; i++)
286 		rs->mcs[i] = 0;
287 }
288 
289 /* filter based on hardware rateset, and sort filtered rateset with basic bit(s) preserved,
290  * and check if resulting rateset is valid.
291 */
292 bool
wlc_rate_hwrs_filter_sort_validate(wlc_rateset_t * rs,const wlc_rateset_t * hw_rs,bool check_brate,u8 txstreams)293 wlc_rate_hwrs_filter_sort_validate(wlc_rateset_t *rs,
294 				   const wlc_rateset_t *hw_rs,
295 				   bool check_brate, u8 txstreams)
296 {
297 	u8 rateset[WLC_MAXRATE + 1];
298 	u8 r;
299 	uint count;
300 	uint i;
301 
302 	memset(rateset, 0, sizeof(rateset));
303 	count = rs->count;
304 
305 	for (i = 0; i < count; i++) {
306 		/* mask off "basic rate" bit, WLC_RATE_FLAG */
307 		r = (int)rs->rates[i] & RATE_MASK;
308 		if ((r > WLC_MAXRATE) || (rate_info[r] == 0)) {
309 			continue;
310 		}
311 		rateset[r] = rs->rates[i];	/* preserve basic bit! */
312 	}
313 
314 	/* fill out the rates in order, looking at only supported rates */
315 	count = 0;
316 	for (i = 0; i < hw_rs->count; i++) {
317 		r = hw_rs->rates[i] & RATE_MASK;
318 		ASSERT(r <= WLC_MAXRATE);
319 		if (rateset[r])
320 			rs->rates[count++] = rateset[r];
321 	}
322 
323 	rs->count = count;
324 
325 	/* only set the mcs rate bit if the equivalent hw mcs bit is set */
326 	for (i = 0; i < MCSSET_LEN; i++)
327 		rs->mcs[i] = (rs->mcs[i] & hw_rs->mcs[i]);
328 
329 	if (wlc_rateset_valid(rs, check_brate))
330 		return true;
331 	else
332 		return false;
333 }
334 
335 /* calculate the rate of a rx'd frame and return it as a ratespec */
wlc_compute_rspec(d11rxhdr_t * rxh,u8 * plcp)336 ratespec_t BCMFASTPATH wlc_compute_rspec(d11rxhdr_t *rxh, u8 *plcp)
337 {
338 	int phy_type;
339 	ratespec_t rspec = PHY_TXC1_BW_20MHZ << RSPEC_BW_SHIFT;
340 
341 	phy_type =
342 	    ((rxh->RxChan & RXS_CHAN_PHYTYPE_MASK) >> RXS_CHAN_PHYTYPE_SHIFT);
343 
344 	if ((phy_type == PHY_TYPE_N) || (phy_type == PHY_TYPE_SSN) ||
345 	    (phy_type == PHY_TYPE_LCN) || (phy_type == PHY_TYPE_HT)) {
346 		switch (rxh->PhyRxStatus_0 & PRXS0_FT_MASK) {
347 		case PRXS0_CCK:
348 			rspec =
349 			    CCK_PHY2MAC_RATE(((cck_phy_hdr_t *) plcp)->signal);
350 			break;
351 		case PRXS0_OFDM:
352 			rspec =
353 			    OFDM_PHY2MAC_RATE(((ofdm_phy_hdr_t *) plcp)->
354 					      rlpt[0]);
355 			break;
356 		case PRXS0_PREN:
357 			rspec = (plcp[0] & MIMO_PLCP_MCS_MASK) | RSPEC_MIMORATE;
358 			if (plcp[0] & MIMO_PLCP_40MHZ) {
359 				/* indicate rspec is for 40 MHz mode */
360 				rspec &= ~RSPEC_BW_MASK;
361 				rspec |= (PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT);
362 			}
363 			break;
364 		case PRXS0_STDN:
365 			/* fallthru */
366 		default:
367 			/* not supported */
368 			ASSERT(0);
369 			break;
370 		}
371 		if (PLCP3_ISSGI(plcp[3]))
372 			rspec |= RSPEC_SHORT_GI;
373 	} else
374 	    if ((phy_type == PHY_TYPE_A) || (rxh->PhyRxStatus_0 & PRXS0_OFDM))
375 		rspec = OFDM_PHY2MAC_RATE(((ofdm_phy_hdr_t *) plcp)->rlpt[0]);
376 	else
377 		rspec = CCK_PHY2MAC_RATE(((cck_phy_hdr_t *) plcp)->signal);
378 
379 	return rspec;
380 }
381 
382 /* copy rateset src to dst as-is (no masking or sorting) */
wlc_rateset_copy(const wlc_rateset_t * src,wlc_rateset_t * dst)383 void wlc_rateset_copy(const wlc_rateset_t *src, wlc_rateset_t *dst)
384 {
385 	memcpy(dst, src, sizeof(wlc_rateset_t));
386 }
387 
388 /*
389  * Copy and selectively filter one rateset to another.
390  * 'basic_only' means only copy basic rates.
391  * 'rates' indicates cck (11b) and ofdm rates combinations.
392  *    - 0: cck and ofdm
393  *    - 1: cck only
394  *    - 2: ofdm only
395  * 'xmask' is the copy mask (typically 0x7f or 0xff).
396  */
397 void
wlc_rateset_filter(wlc_rateset_t * src,wlc_rateset_t * dst,bool basic_only,u8 rates,uint xmask,bool mcsallow)398 wlc_rateset_filter(wlc_rateset_t *src, wlc_rateset_t *dst, bool basic_only,
399 		   u8 rates, uint xmask, bool mcsallow)
400 {
401 	uint i;
402 	uint r;
403 	uint count;
404 
405 	count = 0;
406 	for (i = 0; i < src->count; i++) {
407 		r = src->rates[i];
408 		if (basic_only && !(r & WLC_RATE_FLAG))
409 			continue;
410 		if ((rates == WLC_RATES_CCK) && IS_OFDM((r & RATE_MASK)))
411 			continue;
412 		if ((rates == WLC_RATES_OFDM) && IS_CCK((r & RATE_MASK)))
413 			continue;
414 		dst->rates[count++] = r & xmask;
415 	}
416 	dst->count = count;
417 	dst->htphy_membership = src->htphy_membership;
418 
419 	if (mcsallow && rates != WLC_RATES_CCK)
420 		memcpy(&dst->mcs[0], &src->mcs[0], MCSSET_LEN);
421 	else
422 		wlc_rateset_mcs_clear(dst);
423 }
424 
425 /* select rateset for a given phy_type and bandtype and filter it, sort it
426  * and fill rs_tgt with result
427  */
428 void
wlc_rateset_default(wlc_rateset_t * rs_tgt,const wlc_rateset_t * rs_hw,uint phy_type,int bandtype,bool cck_only,uint rate_mask,bool mcsallow,u8 bw,u8 txstreams)429 wlc_rateset_default(wlc_rateset_t *rs_tgt, const wlc_rateset_t *rs_hw,
430 		    uint phy_type, int bandtype, bool cck_only, uint rate_mask,
431 		    bool mcsallow, u8 bw, u8 txstreams)
432 {
433 	const wlc_rateset_t *rs_dflt;
434 	wlc_rateset_t rs_sel;
435 	if ((PHYTYPE_IS(phy_type, PHY_TYPE_HT)) ||
436 	    (PHYTYPE_IS(phy_type, PHY_TYPE_N)) ||
437 	    (PHYTYPE_IS(phy_type, PHY_TYPE_LCN)) ||
438 	    (PHYTYPE_IS(phy_type, PHY_TYPE_SSN))) {
439 		if (BAND_5G(bandtype)) {
440 			rs_dflt = (bw == WLC_20_MHZ ?
441 				   &ofdm_mimo_rates : &ofdm_40bw_mimo_rates);
442 		} else {
443 			rs_dflt = (bw == WLC_20_MHZ ?
444 				   &cck_ofdm_mimo_rates :
445 				   &cck_ofdm_40bw_mimo_rates);
446 		}
447 	} else if (PHYTYPE_IS(phy_type, PHY_TYPE_LP)) {
448 		rs_dflt = (BAND_5G(bandtype)) ? &ofdm_rates : &cck_ofdm_rates;
449 	} else if (PHYTYPE_IS(phy_type, PHY_TYPE_A)) {
450 		rs_dflt = &ofdm_rates;
451 	} else if (PHYTYPE_IS(phy_type, PHY_TYPE_G)) {
452 		rs_dflt = &cck_ofdm_rates;
453 	} else {
454 		ASSERT(0);	/* should not happen */
455 		rs_dflt = &cck_rates;	/* force cck */
456 	}
457 
458 	/* if hw rateset is not supplied, assign selected rateset to it */
459 	if (!rs_hw)
460 		rs_hw = rs_dflt;
461 
462 	wlc_rateset_copy(rs_dflt, &rs_sel);
463 	wlc_rateset_mcs_upd(&rs_sel, txstreams);
464 	wlc_rateset_filter(&rs_sel, rs_tgt, false,
465 			   cck_only ? WLC_RATES_CCK : WLC_RATES_CCK_OFDM,
466 			   rate_mask, mcsallow);
467 	wlc_rate_hwrs_filter_sort_validate(rs_tgt, rs_hw, false,
468 					   mcsallow ? txstreams : 1);
469 }
470 
wlc_rate_legacy_phyctl(uint rate)471 s16 BCMFASTPATH wlc_rate_legacy_phyctl(uint rate)
472 {
473 	uint i;
474 	for (i = 0; i < LEGACY_PHYCFG_TABLE_SIZE; i++)
475 		if (rate == legacy_phycfg_table[i].rate_ofdm)
476 			return legacy_phycfg_table[i].tx_phy_ctl3;
477 
478 	return -1;
479 }
480 
wlc_rateset_mcs_clear(wlc_rateset_t * rateset)481 void wlc_rateset_mcs_clear(wlc_rateset_t *rateset)
482 {
483 	uint i;
484 	for (i = 0; i < MCSSET_LEN; i++)
485 		rateset->mcs[i] = 0;
486 }
487 
wlc_rateset_mcs_build(wlc_rateset_t * rateset,u8 txstreams)488 void wlc_rateset_mcs_build(wlc_rateset_t *rateset, u8 txstreams)
489 {
490 	memcpy(&rateset->mcs[0], &cck_ofdm_mimo_rates.mcs[0], MCSSET_LEN);
491 	wlc_rateset_mcs_upd(rateset, txstreams);
492 }
493 
494 /* Based on bandwidth passed, allow/disallow MCS 32 in the rateset */
wlc_rateset_bw_mcs_filter(wlc_rateset_t * rateset,u8 bw)495 void wlc_rateset_bw_mcs_filter(wlc_rateset_t *rateset, u8 bw)
496 {
497 	if (bw == WLC_40_MHZ)
498 		setbit(rateset->mcs, 32);
499 	else
500 		clrbit(rateset->mcs, 32);
501 }
502