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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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/11.0/sys/net80211/ieee80211_phy.h 297595 2016-04-05 22:01:56Z adrian $
   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 #define IEEE80211_GET_SLOTTIME(ic) \
   57         ((ic->ic_flags & IEEE80211_F_SHSLOT) ? \
   58             IEEE80211_DUR_SHSLOT : IEEE80211_DUR_SLOT)
   59 
   60 /*
   61  * DIFS (microseconds).
   62  */
   63 #define IEEE80211_DUR_DIFS(sifs, slot)  ((sifs) + 2 * (slot))
   64 
   65 struct ieee80211_channel;
   66 
   67 #define IEEE80211_RATE_TABLE_SIZE       128
   68 
   69 struct ieee80211_rate_table {
   70         int             rateCount;              /* NB: for proper padding */
   71         uint8_t         rateCodeToIndex[256];   /* back mapping */
   72         struct {
   73                 uint8_t         phy;            /* CCK/OFDM/TURBO */
   74                 uint32_t        rateKbps;       /* transfer rate in kbs */
   75                 uint8_t         shortPreamble;  /* mask for enabling short
   76                                                  * preamble in CCK rate code */
   77                 uint8_t         dot11Rate;      /* value for supported rates
   78                                                  * info element of MLME */
   79                 uint8_t         ctlRateIndex;   /* index of next lower basic
   80                                                  * rate; used for dur. calcs */
   81                 uint16_t        lpAckDuration;  /* long preamble ACK dur. */
   82                 uint16_t        spAckDuration;  /* short preamble ACK dur. */
   83         } info[IEEE80211_RATE_TABLE_SIZE];
   84 };
   85 
   86 const struct ieee80211_rate_table *ieee80211_get_ratetable(
   87                         struct ieee80211_channel *);
   88 
   89 static __inline__ uint8_t
   90 ieee80211_ack_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
   91 {
   92         /*
   93          * XXX Assert this is for a legacy rate; not for an MCS rate.
   94          * If the caller wishes to use it for a basic rate, they should
   95          * clear the high bit first.
   96          */
   97         KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
   98 
   99         uint8_t cix = rt->info[rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]].ctlRateIndex;
  100         KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
  101         return rt->info[cix].dot11Rate;
  102 }
  103 
  104 static __inline__ uint8_t
  105 ieee80211_ctl_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
  106 {
  107         /*
  108          * XXX Assert this is for a legacy rate; not for an MCS rate.
  109          * If the caller wishes to use it for a basic rate, they should
  110          * clear the high bit first.
  111          */
  112         KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
  113 
  114         uint8_t cix = rt->info[rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]].ctlRateIndex;
  115         KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
  116         return rt->info[cix].dot11Rate;
  117 }
  118 
  119 static __inline__ enum ieee80211_phytype
  120 ieee80211_rate2phytype(const struct ieee80211_rate_table *rt, uint8_t rate)
  121 {
  122         /*
  123          * XXX Assert this is for a legacy rate; not for an MCS rate.
  124          * If the caller wishes to use it for a basic rate, they should
  125          * clear the high bit first.
  126          */
  127         KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
  128 
  129         uint8_t rix = rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL];
  130         KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
  131         return rt->info[rix].phy;
  132 }
  133 
  134 static __inline__ int
  135 ieee80211_isratevalid(const struct ieee80211_rate_table *rt, uint8_t rate)
  136 {
  137         /*
  138          * XXX Assert this is for a legacy rate; not for an MCS rate.
  139          * If the caller wishes to use it for a basic rate, they should
  140          * clear the high bit first.
  141          */
  142         KASSERT(! (rate & 0x80), ("rate %d is basic/mcs?", rate));
  143 
  144         return rt->rateCodeToIndex[rate] != (uint8_t)-1;
  145 }
  146 
  147 /*
  148  * Calculate ACK field for
  149  * o  non-fragment data frames
  150  * o  management frames
  151  * sent using rate, phy and short preamble setting.
  152  */
  153 static __inline__ uint16_t
  154 ieee80211_ack_duration(const struct ieee80211_rate_table *rt,
  155     uint8_t rate, int isShortPreamble)
  156 {
  157         uint8_t rix = rt->rateCodeToIndex[rate];
  158 
  159         KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
  160         if (isShortPreamble) {
  161                 KASSERT(rt->info[rix].spAckDuration != 0,
  162                         ("shpreamble ack dur is not computed!\n"));
  163                 return rt->info[rix].spAckDuration;
  164         } else {
  165                 KASSERT(rt->info[rix].lpAckDuration != 0,
  166                         ("lgpreamble ack dur is not computed!\n"));
  167                 return rt->info[rix].lpAckDuration;
  168         }
  169 }
  170 
  171 static __inline__ uint8_t
  172 ieee80211_legacy_rate_lookup(const struct ieee80211_rate_table *rt,
  173     uint8_t rate)
  174 {
  175 
  176         return (rt->rateCodeToIndex[rate & IEEE80211_RATE_VAL]);
  177 }
  178 
  179 /*
  180  * Compute the time to transmit a frame of length frameLen bytes
  181  * using the specified 802.11 rate code, phy, and short preamble
  182  * setting.
  183  *
  184  * NB: SIFS is included.
  185  */
  186 uint16_t        ieee80211_compute_duration(const struct ieee80211_rate_table *,
  187                         uint32_t frameLen, uint16_t rate, int isShortPreamble);
  188 /*
  189  * Convert PLCP signal/rate field to 802.11 rate code (.5Mbits/s)
  190  */
  191 uint8_t         ieee80211_plcp2rate(uint8_t, enum ieee80211_phytype);
  192 /*
  193  * Convert 802.11 rate code to PLCP signal.
  194  */
  195 uint8_t         ieee80211_rate2plcp(int, enum ieee80211_phytype);
  196 
  197 /*
  198  * 802.11n rate manipulation.
  199  */
  200 
  201 #define IEEE80211_HT_RC_2_MCS(_rc)      ((_rc) & 0x1f)
  202 #define IEEE80211_HT_RC_2_STREAMS(_rc)  ((((_rc) & 0x78) >> 3) + 1)
  203 #define IEEE80211_IS_HT_RATE(_rc)               ( (_rc) & IEEE80211_RATE_MCS)
  204 
  205 uint32_t        ieee80211_compute_duration_ht(uint32_t frameLen,
  206                         uint16_t rate, int streams, int isht40,
  207                         int isShortGI);
  208 
  209 #endif  /* _KERNEL */
  210 #endif  /* !_NET80211_IEEE80211_PHY_H_ */

Cache object: 7c2b81b32f91280716f2b0aa20ec3a2d


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.