1 /* $OpenBSD: if_urtwn.c,v 1.16 2011/02/10 17:26:40 jakemsr Exp $ */
2
3 /*-
4 * Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr>
5 * Copyright (c) 2014 Kevin Lo <kevlo@FreeBSD.org>
6 * Copyright (c) 2015-2016 Andriy Voskoboinyk <avos@FreeBSD.org>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21 #ifndef IF_RTWN_RIDX_H
22 #define IF_RTWN_RIDX_H
23
24 /* HW rate indices. */
25 #define RTWN_RIDX_CCK1 0
26 #define RTWN_RIDX_CCK2 1
27 #define RTWN_RIDX_CCK55 2
28 #define RTWN_RIDX_CCK11 3
29 #define RTWN_RIDX_OFDM6 4
30 #define RTWN_RIDX_OFDM9 5
31 #define RTWN_RIDX_OFDM12 6
32 #define RTWN_RIDX_OFDM18 7
33 #define RTWN_RIDX_OFDM24 8
34 #define RTWN_RIDX_OFDM36 9
35 #define RTWN_RIDX_OFDM48 10
36 #define RTWN_RIDX_OFDM54 11
37
38 #define RTWN_RIDX_HT_MCS_SHIFT 12
39 #define RTWN_RIDX_HT_MCS(i) (RTWN_RIDX_HT_MCS_SHIFT + (i))
40
41 #define RTWN_RIDX_COUNT 28
42 #define RTWN_RIDX_UNKNOWN (uint8_t)-1
43
44 #define RTWN_RATE_IS_CCK(rate) ((rate) <= RTWN_RIDX_CCK11)
45 #define RTWN_RATE_IS_OFDM(rate) \
46 ((rate) >= RTWN_RIDX_OFDM6 && (rate) != RTWN_RIDX_UNKNOWN)
47
48 static const uint8_t ridx2rate[] =
49 { 2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108 };
50
51 static __inline uint8_t
rate2ridx(uint8_t rate)52 rate2ridx(uint8_t rate)
53 {
54 if (rate & IEEE80211_RATE_MCS) {
55 return ((rate & 0xf) + RTWN_RIDX_HT_MCS_SHIFT);
56 }
57 switch (rate) {
58 /* 11g */
59 case 12: return 4;
60 case 18: return 5;
61 case 24: return 6;
62 case 36: return 7;
63 case 48: return 8;
64 case 72: return 9;
65 case 96: return 10;
66 case 108: return 11;
67 /* 11b */
68 case 2: return 0;
69 case 4: return 1;
70 case 11: return 2;
71 case 22: return 3;
72 default: return RTWN_RIDX_UNKNOWN;
73 }
74 }
75
76 /* XXX move to net80211 */
77 static __inline__ uint8_t
rtwn_ctl_mcsrate(const struct ieee80211_rate_table * rt,uint8_t ridx)78 rtwn_ctl_mcsrate(const struct ieee80211_rate_table *rt, uint8_t ridx)
79 {
80 uint8_t cix, rate;
81
82 /* Check if we are using MCS rate. */
83 KASSERT(ridx >= RTWN_RIDX_HT_MCS(0) && ridx != RTWN_RIDX_UNKNOWN,
84 ("bad mcs rate index %d", ridx));
85
86 rate = (ridx - RTWN_RIDX_HT_MCS(0)) | IEEE80211_RATE_MCS;
87 cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex;
88 KASSERT(cix != (uint8_t)-1, ("rate %d (%d) has no info", rate, ridx));
89 return rt->info[cix].dot11Rate;
90 }
91
92 #endif /* IF_RTWN_RIDX_H */
93