57f78a351e
* begin moving the 11n macros out of ieee80211_phy.c and into a header so they can be used elsewhere. * rename some of them into the IEEE80211_* namespace. * convert HT_RC_2_MCS() to work with three-stream rates.
211 lines
6.6 KiB
C
211 lines
6.6 KiB
C
/*-
|
|
* 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 */
|
|
|
|
#define IEEE80211_GET_SLOTTIME(ic) \
|
|
((ic->ic_flags & IEEE80211_F_SHSLOT) ? \
|
|
IEEE80211_DUR_SHSLOT : IEEE80211_DUR_SLOT)
|
|
|
|
/*
|
|
* DIFS (microseconds).
|
|
*/
|
|
#define IEEE80211_DUR_DIFS(sifs, slot) ((sifs) + 2 * (slot))
|
|
|
|
struct ieee80211_channel;
|
|
|
|
#define IEEE80211_RATE_TABLE_SIZE 128
|
|
|
|
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[IEEE80211_RATE_TABLE_SIZE];
|
|
};
|
|
|
|
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)
|
|
{
|
|
/*
|
|
* XXX Assert this is for a legacy rate; not for an MCS rate.
|
|
* If the caller wishes to use it for a basic rate, they should
|
|
* clear the high bit first.
|
|
*/
|
|
KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
|
|
|
|
uint8_t cix = rt->info[rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]].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)
|
|
{
|
|
/*
|
|
* XXX Assert this is for a legacy rate; not for an MCS rate.
|
|
* If the caller wishes to use it for a basic rate, they should
|
|
* clear the high bit first.
|
|
*/
|
|
KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
|
|
|
|
uint8_t cix = rt->info[rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]].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)
|
|
{
|
|
/*
|
|
* XXX Assert this is for a legacy rate; not for an MCS rate.
|
|
* If the caller wishes to use it for a basic rate, they should
|
|
* clear the high bit first.
|
|
*/
|
|
KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
|
|
|
|
uint8_t rix = rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL];
|
|
KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
|
|
return rt->info[rix].phy;
|
|
}
|
|
|
|
static __inline__ int
|
|
ieee80211_isratevalid(const struct ieee80211_rate_table *rt, uint8_t rate)
|
|
{
|
|
/*
|
|
* XXX Assert this is for a legacy rate; not for an MCS rate.
|
|
* If the caller wishes to use it for a basic rate, they should
|
|
* clear the high bit first.
|
|
*/
|
|
KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
|
|
|
|
return rt->rateCodeToIndex[rate] != (uint8_t)-1;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
}
|
|
|
|
static __inline__ uint8_t
|
|
ieee80211_legacy_rate_lookup(const struct ieee80211_rate_table *rt,
|
|
uint8_t rate)
|
|
{
|
|
|
|
return (rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]);
|
|
}
|
|
|
|
/*
|
|
* 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, enum ieee80211_phytype);
|
|
/*
|
|
* Convert 802.11 rate code to PLCP signal.
|
|
*/
|
|
uint8_t ieee80211_rate2plcp(int, enum ieee80211_phytype);
|
|
|
|
/*
|
|
* 802.11n rate manipulation.
|
|
*/
|
|
|
|
#define IEEE80211_HT_RC_2_MCS(_rc) ((_rc) & 0x1f)
|
|
#define IEEE80211_HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1)
|
|
#define IEEE80211_IS_HT_RATE(_rc) ( (_rc) & IEEE80211_RATE_MCS)
|
|
|
|
uint32_t ieee80211_compute_duration_ht(uint32_t frameLen,
|
|
uint16_t rate, int streams, int isht40,
|
|
int isShortGI);
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* !_NET80211_IEEE80211_PHY_H_ */
|