1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 #ifndef _FBSD_COMPAT_NET80211_IEEE80211_PHY_H_ 29 #define _FBSD_COMPAT_NET80211_IEEE80211_PHY_H_ 30 31 #ifdef _KERNEL 32 /* 33 * IEEE 802.11 PHY-related definitions. 34 */ 35 36 void ieee80211_phy_init(void); 37 38 /* 39 * Contention window (slots). 40 */ 41 #define IEEE80211_CW_MAX 1023 /* aCWmax */ 42 #define IEEE80211_CW_MIN_0 31 /* DS/CCK aCWmin, ERP aCWmin(0) */ 43 #define IEEE80211_CW_MIN_1 15 /* OFDM aCWmin, ERP aCWmin(1) */ 44 45 /* 46 * SIFS (microseconds). 47 */ 48 #define IEEE80211_DUR_SIFS 10 /* DS/CCK/ERP SIFS */ 49 #define IEEE80211_DUR_OFDM_SIFS 16 /* OFDM SIFS */ 50 51 /* 52 * Slot time (microseconds). 53 */ 54 #define IEEE80211_DUR_SLOT 20 /* DS/CCK slottime, ERP long slottime */ 55 #define IEEE80211_DUR_SHSLOT 9 /* ERP short slottime */ 56 #define IEEE80211_DUR_OFDM_SLOT 9 /* OFDM slottime */ 57 58 /* 59 * DIFS (microseconds). 60 */ 61 #define IEEE80211_DUR_DIFS(sifs, slot) ((sifs) + 2 * (slot)) 62 63 struct ieee80211_channel; 64 65 struct ieee80211_rate_table { 66 int rateCount; /* NB: for proper padding */ 67 uint8_t rateCodeToIndex[256]; /* back mapping */ 68 struct { 69 uint8_t phy; /* CCK/OFDM/TURBO */ 70 uint32_t rateKbps; /* transfer rate in kbs */ 71 uint8_t shortPreamble; /* mask for enabling short 72 * preamble in CCK rate code */ 73 uint8_t dot11Rate; /* value for supported rates 74 * info element of MLME */ 75 uint8_t ctlRateIndex; /* index of next lower basic 76 * rate; used for dur. calcs */ 77 uint16_t lpAckDuration; /* long preamble ACK dur. */ 78 uint16_t spAckDuration; /* short preamble ACK dur. */ 79 } info[32]; 80 }; 81 82 const struct ieee80211_rate_table *ieee80211_get_ratetable( 83 struct ieee80211_channel *); 84 85 static __inline__ uint8_t 86 ieee80211_ack_rate(const struct ieee80211_rate_table *rt, uint8_t rate) 87 { 88 uint8_t cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex; 89 KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate)); 90 return rt->info[cix].dot11Rate; 91 } 92 93 static __inline__ uint8_t 94 ieee80211_ctl_rate(const struct ieee80211_rate_table *rt, uint8_t rate) 95 { 96 uint8_t cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex; 97 KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate)); 98 return rt->info[cix].dot11Rate; 99 } 100 101 static __inline__ enum ieee80211_phytype 102 ieee80211_rate2phytype(const struct ieee80211_rate_table *rt, uint8_t rate) 103 { 104 uint8_t rix = rt->rateCodeToIndex[rate]; 105 KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate)); 106 return (enum ieee80211_phytype)rt->info[rix].phy; 107 } 108 109 static __inline__ int 110 ieee80211_isratevalid(const struct ieee80211_rate_table *rt, uint8_t rate) 111 { 112 return rt->rateCodeToIndex[rate] != (uint8_t)-1; 113 } 114 115 /* 116 * Calculate ACK field for 117 * o non-fragment data frames 118 * o management frames 119 * sent using rate, phy and short preamble setting. 120 */ 121 static __inline__ uint16_t 122 ieee80211_ack_duration(const struct ieee80211_rate_table *rt, 123 uint8_t rate, int isShortPreamble) 124 { 125 uint8_t rix = rt->rateCodeToIndex[rate]; 126 127 KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate)); 128 if (isShortPreamble) { 129 KASSERT(rt->info[rix].spAckDuration != 0, 130 ("shpreamble ack dur is not computed!\n")); 131 return rt->info[rix].spAckDuration; 132 } else { 133 KASSERT(rt->info[rix].lpAckDuration != 0, 134 ("lgpreamble ack dur is not computed!\n")); 135 return rt->info[rix].lpAckDuration; 136 } 137 } 138 139 /* 140 * Compute the time to transmit a frame of length frameLen bytes 141 * using the specified 802.11 rate code, phy, and short preamble 142 * setting. 143 * 144 * NB: SIFS is included. 145 */ 146 uint16_t ieee80211_compute_duration(const struct ieee80211_rate_table *, 147 uint32_t frameLen, uint16_t rate, int isShortPreamble); 148 /* 149 * Convert PLCP signal/rate field to 802.11 rate code (.5Mbits/s) 150 */ 151 uint8_t ieee80211_plcp2rate(uint8_t, enum ieee80211_phytype); 152 /* 153 * Convert 802.11 rate code to PLCP signal. 154 */ 155 uint8_t ieee80211_rate2plcp(int, enum ieee80211_phytype); 156 #endif /* _KERNEL */ 157 #endif /* _FBSD_COMPAT_NET80211_IEEE80211_PHY_H_ */ 158