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  * 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: releng/9.0/sys/net80211/ieee80211_phy.h 193072 2009-05-29 23:39:16Z sam $
   26  */
   27 
   28 #ifndef _NET80211_IEEE80211_PHY_H_
   29 #define _NET80211_IEEE80211_PHY_H_
   30 
   31 #ifdef _KERNEL
   32 /*
   33  * IEEE 802.11 PHY-related definitions.
   34  */
   35 
   36 /*
   37  * Contention window (slots).
   38  */
   39 #define IEEE80211_CW_MAX        1023    /* aCWmax */
   40 #define IEEE80211_CW_MIN_0      31      /* DS/CCK aCWmin, ERP aCWmin(0) */
   41 #define IEEE80211_CW_MIN_1      15      /* OFDM aCWmin, ERP aCWmin(1) */
   42 
   43 /*
   44  * SIFS (microseconds).
   45  */
   46 #define IEEE80211_DUR_SIFS      10      /* DS/CCK/ERP SIFS */
   47 #define IEEE80211_DUR_OFDM_SIFS 16      /* OFDM SIFS */
   48 
   49 /*
   50  * Slot time (microseconds).
   51  */
   52 #define IEEE80211_DUR_SLOT      20      /* DS/CCK slottime, ERP long slottime */
   53 #define IEEE80211_DUR_SHSLOT    9       /* ERP short slottime */
   54 #define IEEE80211_DUR_OFDM_SLOT 9       /* OFDM slottime */
   55 
   56 /*
   57  * DIFS (microseconds).
   58  */
   59 #define IEEE80211_DUR_DIFS(sifs, slot)  ((sifs) + 2 * (slot))
   60 
   61 struct ieee80211_channel;
   62 
   63 struct ieee80211_rate_table {
   64         int             rateCount;              /* NB: for proper padding */
   65         uint8_t         rateCodeToIndex[256];   /* back mapping */
   66         struct {
   67                 uint8_t         phy;            /* CCK/OFDM/TURBO */
   68                 uint32_t        rateKbps;       /* transfer rate in kbs */
   69                 uint8_t         shortPreamble;  /* mask for enabling short
   70                                                  * preamble in CCK rate code */
   71                 uint8_t         dot11Rate;      /* value for supported rates
   72                                                  * info element of MLME */
   73                 uint8_t         ctlRateIndex;   /* index of next lower basic
   74                                                  * rate; used for dur. calcs */
   75                 uint16_t        lpAckDuration;  /* long preamble ACK dur. */
   76                 uint16_t        spAckDuration;  /* short preamble ACK dur. */
   77         } info[32];
   78 };
   79 
   80 const struct ieee80211_rate_table *ieee80211_get_ratetable(
   81                         struct ieee80211_channel *);
   82 
   83 static __inline__ uint8_t
   84 ieee80211_ack_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
   85 {
   86         uint8_t cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex;
   87         KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
   88         return rt->info[cix].dot11Rate;
   89 }
   90 
   91 static __inline__ uint8_t
   92 ieee80211_ctl_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
   93 {
   94         uint8_t cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex;
   95         KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
   96         return rt->info[cix].dot11Rate;
   97 }
   98 
   99 static __inline__ enum ieee80211_phytype
  100 ieee80211_rate2phytype(const struct ieee80211_rate_table *rt, uint8_t rate)
  101 {
  102         uint8_t rix = rt->rateCodeToIndex[rate];
  103         KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
  104         return rt->info[rix].phy;
  105 }
  106 
  107 static __inline__ int
  108 ieee80211_isratevalid(const struct ieee80211_rate_table *rt, uint8_t rate)
  109 {
  110         return rt->rateCodeToIndex[rate] != (uint8_t)-1;
  111 }
  112 
  113 /*
  114  * Calculate ACK field for
  115  * o  non-fragment data frames
  116  * o  management frames
  117  * sent using rate, phy and short preamble setting.
  118  */
  119 static __inline__ uint16_t
  120 ieee80211_ack_duration(const struct ieee80211_rate_table *rt,
  121     uint8_t rate, int isShortPreamble)
  122 {
  123         uint8_t rix = rt->rateCodeToIndex[rate];
  124 
  125         KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
  126         if (isShortPreamble) {
  127                 KASSERT(rt->info[rix].spAckDuration != 0,
  128                         ("shpreamble ack dur is not computed!\n"));
  129                 return rt->info[rix].spAckDuration;
  130         } else {
  131                 KASSERT(rt->info[rix].lpAckDuration != 0,
  132                         ("lgpreamble ack dur is not computed!\n"));
  133                 return rt->info[rix].lpAckDuration;
  134         }
  135 }
  136 
  137 /*
  138  * Compute the time to transmit a frame of length frameLen bytes
  139  * using the specified 802.11 rate code, phy, and short preamble
  140  * setting.
  141  *
  142  * NB: SIFS is included.
  143  */
  144 uint16_t        ieee80211_compute_duration(const struct ieee80211_rate_table *,
  145                         uint32_t frameLen, uint16_t rate, int isShortPreamble);
  146 /*
  147  * Convert PLCP signal/rate field to 802.11 rate code (.5Mbits/s)
  148  */
  149 uint8_t         ieee80211_plcp2rate(uint8_t, enum ieee80211_phytype);
  150 /*
  151  * Convert 802.11 rate code to PLCP signal.
  152  */
  153 uint8_t         ieee80211_rate2plcp(int, enum ieee80211_phytype);
  154 #endif  /* _KERNEL */
  155 #endif  /* !_NET80211_IEEE80211_PHY_H_ */

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