diff options
Diffstat (limited to 'sys/net80211/ieee80211_phy.h')
| -rw-r--r-- | sys/net80211/ieee80211_phy.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/sys/net80211/ieee80211_phy.h b/sys/net80211/ieee80211_phy.h new file mode 100644 index 0000000..2b5adcf --- /dev/null +++ b/sys/net80211/ieee80211_phy.h @@ -0,0 +1,149 @@ +/*- + * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _NET80211_IEEE80211_PHY_H_ +#define _NET80211_IEEE80211_PHY_H_ + +#ifdef _KERNEL +/* + * IEEE 802.11 PHY-related definitions. + */ + +/* + * Contention window (slots). + */ +#define IEEE80211_CW_MAX 1023 /* aCWmax */ +#define IEEE80211_CW_MIN_0 31 /* DS/CCK aCWmin, ERP aCWmin(0) */ +#define IEEE80211_CW_MIN_1 15 /* OFDM aCWmin, ERP aCWmin(1) */ + +/* + * SIFS (microseconds). + */ +#define IEEE80211_DUR_SIFS 10 /* DS/CCK/ERP SIFS */ +#define IEEE80211_DUR_OFDM_SIFS 16 /* OFDM SIFS */ + +/* + * Slot time (microseconds). + */ +#define IEEE80211_DUR_SLOT 20 /* DS/CCK slottime, ERP long slottime */ +#define IEEE80211_DUR_SHSLOT 9 /* ERP short slottime */ +#define IEEE80211_DUR_OFDM_SLOT 9 /* OFDM slottime */ + +/* + * DIFS (microseconds). + */ +#define IEEE80211_DUR_DIFS(sifs, slot) ((sifs) + 2 * (slot)) + +struct ieee80211_channel; + +struct ieee80211_rate_table { + int rateCount; /* NB: for proper padding */ + uint8_t rateCodeToIndex[256]; /* back mapping */ + struct { + uint8_t phy; /* CCK/OFDM/TURBO */ + uint32_t rateKbps; /* transfer rate in kbs */ + uint8_t shortPreamble; /* mask for enabling short + * preamble in CCK rate code */ + uint8_t dot11Rate; /* value for supported rates + * info element of MLME */ + uint8_t ctlRateIndex; /* index of next lower basic + * rate; used for dur. calcs */ + uint16_t lpAckDuration; /* long preamble ACK dur. */ + uint16_t spAckDuration; /* short preamble ACK dur. */ + } info[32]; +}; + +const struct ieee80211_rate_table *ieee80211_get_ratetable( + struct ieee80211_channel *); + +static __inline__ uint8_t +ieee80211_ack_rate(const struct ieee80211_rate_table *rt, uint8_t rate) +{ + uint8_t cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex; + KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate)); + return rt->info[cix].dot11Rate; +} + +static __inline__ uint8_t +ieee80211_ctl_rate(const struct ieee80211_rate_table *rt, uint8_t rate) +{ + uint8_t cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex; + KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate)); + return rt->info[cix].dot11Rate; +} + +static __inline__ enum ieee80211_phytype +ieee80211_rate2phytype(const struct ieee80211_rate_table *rt, uint8_t rate) +{ + uint8_t rix = rt->rateCodeToIndex[rate]; + KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate)); + return rt->info[rix].phy; +} + +/* + * Calculate ACK field for + * o non-fragment data frames + * o management frames + * sent using rate, phy and short preamble setting. + */ +static __inline__ uint16_t +ieee80211_ack_duration(const struct ieee80211_rate_table *rt, + uint8_t rate, int isShortPreamble) +{ + uint8_t rix = rt->rateCodeToIndex[rate]; + + KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate)); + if (isShortPreamble) { + KASSERT(rt->info[rix].spAckDuration != 0, + ("shpreamble ack dur is not computed!\n")); + return rt->info[rix].spAckDuration; + } else { + KASSERT(rt->info[rix].lpAckDuration != 0, + ("lgpreamble ack dur is not computed!\n")); + return rt->info[rix].lpAckDuration; + } +} + +/* + * Compute the time to transmit a frame of length frameLen bytes + * using the specified 802.11 rate code, phy, and short preamble + * setting. + * + * NB: SIFS is included. + */ +uint16_t ieee80211_compute_duration(const struct ieee80211_rate_table *, + uint32_t frameLen, uint16_t rate, int isShortPreamble); +/* + * Convert PLCP signal/rate field to 802.11 rate code (.5Mbits/s) + */ +uint8_t ieee80211_plcp2rate(uint8_t, int); +/* + * Convert 802.11 rate code to PLCP signal. + */ +uint8_t ieee80211_rate2plcp(int); +#endif /* _KERNEL */ +#endif /* !_NET80211_IEEE80211_PHY_H_ */ |
