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freebsd-dev/sys/net80211/ieee80211_phy.h
Adrian Chadd d20ff6e680 [net80211] Migrate short slot time configuration into per-vap and deferred taskqueue updates. 
The 11b/11g ERP and slot time update handling are two things which weren't
migrated into the per-VAP state when Sam did the initial VAP work.
That makes sense for a lot of setups where net80211 is driving radio state
and the radio only cares about the shared state.

However, as noted by a now deleted comment, the ERP and slot time updates
aren't EXACTLY correct/accurate - they only take into account the most
RECENTLY created VAP, and the state updates when one creates/destroys
VAPs isn't exactly great.

So:

* track the short slot logic per VAP;
* whenever the slot time configuration changes, just push it into a deferred
  task queue update so drivers don't have to serialise it themselves;
* if a driver registers a per-VAP slot time handler then it'll just get the
  per VAP one;
* .. if a driver registers a global one then the legacy behaviour is maintained -
  a single slot time is calculated and pushed out.

Note that the calculated slot time is better than the existing logic - if ANY
of the VAPs require long slot then it's disabled for all VAPs rather than
whatever the last configured VAP did.

Now, this isn't entirely complete - the rest of ERP tracking around short/long
slot capable station tracking needs to be converted into per-VAP, as well
as the preamble/barker flags.  Luckily those also can be done in a similar
fashion - keep per-VAP counters/flags and unify them before doing the driver
update.  I'll defer that work until later.

All the existing drivers can keep doing what they're doing with the global
slot time flags as that is maintained. One driver (iwi) used the per-VAP
flags instead of the ic flags, so now that driver will work properly.

This unblocks some ath10k porting work as the firmware takes the slot time
configuration per-VAP rather than globally, and some firmware handles
STA+AP and STA+STA (on same/different channels) configurations where
the firmware will switch slot time as appropriate.

Tested:

* AR9380, STA/AP mode
* AR9880 (ath10k), STA mode
2020-06-05 06:21:23 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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 */
/*
* For drivers that don't implement per-VAP slot time
* (ie, they rely on net80211 figuring out the union
* between VAPs to program a single radio) - return
* the current radio configured slot time.
*/
#define IEEE80211_GET_SLOTTIME(ic) \
((ic->ic_flags & IEEE80211_F_SHSLOT) ? \
IEEE80211_DUR_SHSLOT : IEEE80211_DUR_SLOT)
/*
* For drivers that implement per-VAP slot time; look
* at the per-VAP flags to determine whether this VAP
* is in short or long slot time.
*/
#define IEEE80211_VAP_GET_SLOTTIME(vap) \
((vap->iv_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_ */
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