The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_phy.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   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.
   15  *
   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.
   26  *
   27  * $FreeBSD: releng/12.0/sys/net80211/ieee80211_phy.h 326272 2017-11-27 15:23:17Z pfg $
   28  */
   29 
   30 #ifndef _NET80211_IEEE80211_PHY_H_
   31 #define _NET80211_IEEE80211_PHY_H_
   32 
   33 #ifdef _KERNEL
   34 /*
   35  * IEEE 802.11 PHY-related definitions.
   36  */
   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 #define IEEE80211_GET_SLOTTIME(ic) \
   59         ((ic->ic_flags & IEEE80211_F_SHSLOT) ? \
   60             IEEE80211_DUR_SHSLOT : IEEE80211_DUR_SLOT)
   61 
   62 /*
   63  * DIFS (microseconds).
   64  */
   65 #define IEEE80211_DUR_DIFS(sifs, slot)  ((sifs) + 2 * (slot))
   66 
   67 struct ieee80211_channel;
   68 
   69 #define IEEE80211_RATE_TABLE_SIZE       128
   70 
   71 struct ieee80211_rate_table {
   72         int             rateCount;              /* NB: for proper padding */
   73         uint8_t         rateCodeToIndex[256];   /* back mapping */
   74         struct {
   75                 uint8_t         phy;            /* CCK/OFDM/TURBO */
   76                 uint32_t        rateKbps;       /* transfer rate in kbs */
   77                 uint8_t         shortPreamble;  /* mask for enabling short
   78                                                  * preamble in CCK rate code */
   79                 uint8_t         dot11Rate;      /* value for supported rates
   80                                                  * info element of MLME */
   81                 uint8_t         ctlRateIndex;   /* index of next lower basic
   82                                                  * rate; used for dur. calcs */
   83                 uint16_t        lpAckDuration;  /* long preamble ACK dur. */
   84                 uint16_t        spAckDuration;  /* short preamble ACK dur. */
   85         } info[IEEE80211_RATE_TABLE_SIZE];
   86 };
   87 
   88 const struct ieee80211_rate_table *ieee80211_get_ratetable(
   89                         struct ieee80211_channel *);
   90 
   91 static __inline__ uint8_t
   92 ieee80211_ack_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
   93 {
   94         /*
   95          * XXX Assert this is for a legacy rate; not for an MCS rate.
   96          * If the caller wishes to use it for a basic rate, they should
   97          * clear the high bit first.
   98          */
   99         KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
  100 
  101         uint8_t cix = rt->info[rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]].ctlRateIndex;
  102         KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
  103         return rt->info[cix].dot11Rate;
  104 }
  105 
  106 static __inline__ uint8_t
  107 ieee80211_ctl_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
  108 {
  109         /*
  110          * XXX Assert this is for a legacy rate; not for an MCS rate.
  111          * If the caller wishes to use it for a basic rate, they should
  112          * clear the high bit first.
  113          */
  114         KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
  115 
  116         uint8_t cix = rt->info[rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]].ctlRateIndex;
  117         KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
  118         return rt->info[cix].dot11Rate;
  119 }
  120 
  121 static __inline__ enum ieee80211_phytype
  122 ieee80211_rate2phytype(const struct ieee80211_rate_table *rt, uint8_t rate)
  123 {
  124         /*
  125          * XXX Assert this is for a legacy rate; not for an MCS rate.
  126          * If the caller wishes to use it for a basic rate, they should
  127          * clear the high bit first.
  128          */
  129         KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
  130 
  131         uint8_t rix = rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL];
  132         KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
  133         return rt->info[rix].phy;
  134 }
  135 
  136 static __inline__ int
  137 ieee80211_isratevalid(const struct ieee80211_rate_table *rt, uint8_t rate)
  138 {
  139         /*
  140          * XXX Assert this is for a legacy rate; not for an MCS rate.
  141          * If the caller wishes to use it for a basic rate, they should
  142          * clear the high bit first.
  143          */
  144         KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
  145 
  146         return rt->rateCodeToIndex[rate] != (uint8_t)-1;
  147 }
  148 
  149 /*
  150  * Calculate ACK field for
  151  * o  non-fragment data frames
  152  * o  management frames
  153  * sent using rate, phy and short preamble setting.
  154  */
  155 static __inline__ uint16_t
  156 ieee80211_ack_duration(const struct ieee80211_rate_table *rt,
  157     uint8_t rate, int isShortPreamble)
  158 {
  159         uint8_t rix = rt->rateCodeToIndex[rate];
  160 
  161         KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
  162         if (isShortPreamble) {
  163                 KASSERT(rt->info[rix].spAckDuration != 0,
  164                         ("shpreamble ack dur is not computed!\n"));
  165                 return rt->info[rix].spAckDuration;
  166         } else {
  167                 KASSERT(rt->info[rix].lpAckDuration != 0,
  168                         ("lgpreamble ack dur is not computed!\n"));
  169                 return rt->info[rix].lpAckDuration;
  170         }
  171 }
  172 
  173 static __inline__ uint8_t
  174 ieee80211_legacy_rate_lookup(const struct ieee80211_rate_table *rt,
  175     uint8_t rate)
  176 {
  177 
  178         return (rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]);
  179 }
  180 
  181 /*
  182  * Compute the time to transmit a frame of length frameLen bytes
  183  * using the specified 802.11 rate code, phy, and short preamble
  184  * setting.
  185  *
  186  * NB: SIFS is included.
  187  */
  188 uint16_t        ieee80211_compute_duration(const struct ieee80211_rate_table *,
  189                         uint32_t frameLen, uint16_t rate, int isShortPreamble);
  190 /*
  191  * Convert PLCP signal/rate field to 802.11 rate code (.5Mbits/s)
  192  */
  193 uint8_t         ieee80211_plcp2rate(uint8_t, enum ieee80211_phytype);
  194 /*
  195  * Convert 802.11 rate code to PLCP signal.
  196  */
  197 uint8_t         ieee80211_rate2plcp(int, enum ieee80211_phytype);
  198 
  199 /*
  200  * 802.11n rate manipulation.
  201  */
  202 
  203 #define IEEE80211_HT_RC_2_MCS(_rc)      ((_rc) & 0x1f)
  204 #define IEEE80211_HT_RC_2_STREAMS(_rc)  ((((_rc) & 0x78) >> 3) + 1)
  205 #define IEEE80211_IS_HT_RATE(_rc)               ( (_rc) & IEEE80211_RATE_MCS)
  206 
  207 uint32_t        ieee80211_compute_duration_ht(uint32_t frameLen,
  208                         uint16_t rate, int streams, int isht40,
  209                         int isShortGI);
  210 
  211 #endif  /* _KERNEL */
  212 #endif  /* !_NET80211_IEEE80211_PHY_H_ */

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