2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #ifndef _NET80211_IEEE80211_PHY_H_
29 #define _NET80211_IEEE80211_PHY_H_
33 * IEEE 802.11 PHY-related definitions.
37 * Contention window (slots).
39 #define IEEE80211_CW_MAX 1023 /* aCWmax */
40 #define IEEE80211_CW_MIN_0 31 /* DS/CCK aCWmin, ERP aCWmin(0) */
41 #define IEEE80211_CW_MIN_1 15 /* OFDM aCWmin, ERP aCWmin(1) */
44 * SIFS (microseconds).
46 #define IEEE80211_DUR_SIFS 10 /* DS/CCK/ERP SIFS */
47 #define IEEE80211_DUR_OFDM_SIFS 16 /* OFDM SIFS */
50 * Slot time (microseconds).
52 #define IEEE80211_DUR_SLOT 20 /* DS/CCK slottime, ERP long slottime */
53 #define IEEE80211_DUR_SHSLOT 9 /* ERP short slottime */
54 #define IEEE80211_DUR_OFDM_SLOT 9 /* OFDM slottime */
57 * For drivers that don't implement per-VAP slot time
58 * (ie, they rely on net80211 figuring out the union
59 * between VAPs to program a single radio) - return
60 * the current radio configured slot time.
62 #define IEEE80211_GET_SLOTTIME(ic) \
63 ((ic->ic_flags & IEEE80211_F_SHSLOT) ? \
64 IEEE80211_DUR_SHSLOT : IEEE80211_DUR_SLOT)
67 * For drivers that implement per-VAP slot time; look
68 * at the per-VAP flags to determine whether this VAP
69 * is in short or long slot time.
71 #define IEEE80211_VAP_GET_SLOTTIME(vap) \
72 ((vap->iv_flags & IEEE80211_F_SHSLOT) ? \
73 IEEE80211_DUR_SHSLOT : IEEE80211_DUR_SLOT)
76 * DIFS (microseconds).
78 #define IEEE80211_DUR_DIFS(sifs, slot) ((sifs) + 2 * (slot))
80 struct ieee80211_channel;
82 #define IEEE80211_RATE_TABLE_SIZE 128
84 struct ieee80211_rate_table {
85 int rateCount; /* NB: for proper padding */
86 uint8_t rateCodeToIndex[256]; /* back mapping */
88 uint8_t phy; /* CCK/OFDM/TURBO */
89 uint32_t rateKbps; /* transfer rate in kbs */
90 uint8_t shortPreamble; /* mask for enabling short
91 * preamble in CCK rate code */
92 uint8_t dot11Rate; /* value for supported rates
93 * info element of MLME */
94 uint8_t ctlRateIndex; /* index of next lower basic
95 * rate; used for dur. calcs */
96 uint16_t lpAckDuration; /* long preamble ACK dur. */
97 uint16_t spAckDuration; /* short preamble ACK dur. */
98 } info[IEEE80211_RATE_TABLE_SIZE];
101 const struct ieee80211_rate_table *ieee80211_get_ratetable(
102 struct ieee80211_channel *);
104 static __inline__ uint8_t
105 ieee80211_ack_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
108 * XXX Assert this is for a legacy rate; not for an MCS rate.
109 * If the caller wishes to use it for a basic rate, they should
110 * clear the high bit first.
112 KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
114 uint8_t cix = rt->info[rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]].ctlRateIndex;
115 KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
116 return rt->info[cix].dot11Rate;
119 static __inline__ uint8_t
120 ieee80211_ctl_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
123 * XXX Assert this is for a legacy rate; not for an MCS rate.
124 * If the caller wishes to use it for a basic rate, they should
125 * clear the high bit first.
127 KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
129 uint8_t cix = rt->info[rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]].ctlRateIndex;
130 KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
131 return rt->info[cix].dot11Rate;
134 static __inline__ enum ieee80211_phytype
135 ieee80211_rate2phytype(const struct ieee80211_rate_table *rt, uint8_t rate)
138 * XXX Assert this is for a legacy rate; not for an MCS rate.
139 * If the caller wishes to use it for a basic rate, they should
140 * clear the high bit first.
142 KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
144 uint8_t rix = rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL];
145 KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
146 return rt->info[rix].phy;
149 static __inline__ int
150 ieee80211_isratevalid(const struct ieee80211_rate_table *rt, uint8_t rate)
153 * XXX Assert this is for a legacy rate; not for an MCS rate.
154 * If the caller wishes to use it for a basic rate, they should
155 * clear the high bit first.
157 KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
159 return rt->rateCodeToIndex[rate] != (uint8_t)-1;
163 * Calculate ACK field for
164 * o non-fragment data frames
165 * o management frames
166 * sent using rate, phy and short preamble setting.
168 static __inline__ uint16_t
169 ieee80211_ack_duration(const struct ieee80211_rate_table *rt,
170 uint8_t rate, int isShortPreamble)
172 uint8_t rix = rt->rateCodeToIndex[rate];
174 KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
175 if (isShortPreamble) {
176 KASSERT(rt->info[rix].spAckDuration != 0,
177 ("shpreamble ack dur is not computed!\n"));
178 return rt->info[rix].spAckDuration;
180 KASSERT(rt->info[rix].lpAckDuration != 0,
181 ("lgpreamble ack dur is not computed!\n"));
182 return rt->info[rix].lpAckDuration;
186 static __inline__ uint8_t
187 ieee80211_legacy_rate_lookup(const struct ieee80211_rate_table *rt,
191 return (rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]);
195 * Compute the time to transmit a frame of length frameLen bytes
196 * using the specified 802.11 rate code, phy, and short preamble
199 * NB: SIFS is included.
201 uint16_t ieee80211_compute_duration(const struct ieee80211_rate_table *,
202 uint32_t frameLen, uint16_t rate, int isShortPreamble);
204 * Convert PLCP signal/rate field to 802.11 rate code (.5Mbits/s)
206 uint8_t ieee80211_plcp2rate(uint8_t, enum ieee80211_phytype);
208 * Convert 802.11 rate code to PLCP signal.
210 uint8_t ieee80211_rate2plcp(int, enum ieee80211_phytype);
213 * 802.11n rate manipulation.
216 #define IEEE80211_HT_RC_2_MCS(_rc) ((_rc) & 0x1f)
217 #define IEEE80211_HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1)
218 #define IEEE80211_IS_HT_RATE(_rc) ( (_rc) & IEEE80211_RATE_MCS)
220 uint32_t ieee80211_compute_duration_ht(uint32_t frameLen,
221 uint16_t rate, int streams, int isht40,
225 #endif /* !_NET80211_IEEE80211_PHY_H_ */