The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_ht.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: stable/9/sys/net80211/ieee80211_ht.h 219456 2011-03-10 18:17:24Z bschmidt $
   26  */
   27 #ifndef _NET80211_IEEE80211_HT_H_
   28 #define _NET80211_IEEE80211_HT_H_
   29 
   30 /*
   31  * 802.11n protocol implementation definitions.
   32  */
   33 
   34 #define IEEE80211_AGGR_BAWMAX   64      /* max block ack window size */
   35 /* threshold for aging overlapping non-HT bss */
   36 #define IEEE80211_NONHT_PRESENT_AGE     msecs_to_ticks(60*1000)
   37 
   38 struct ieee80211_tx_ampdu {
   39         struct ieee80211_node *txa_ni;  /* back pointer */
   40         u_short         txa_flags;
   41 #define IEEE80211_AGGR_IMMEDIATE        0x0001  /* BA policy */
   42 #define IEEE80211_AGGR_XCHGPEND         0x0002  /* ADDBA response pending */
   43 #define IEEE80211_AGGR_RUNNING          0x0004  /* ADDBA response received */
   44 #define IEEE80211_AGGR_SETUP            0x0008  /* deferred state setup */
   45 #define IEEE80211_AGGR_NAK              0x0010  /* peer NAK'd ADDBA request */
   46 #define IEEE80211_AGGR_BARPEND          0x0020  /* BAR response pending */
   47         uint8_t         txa_ac;
   48         uint8_t         txa_token;      /* dialog token */
   49         int             txa_lastsample; /* ticks @ last traffic sample */
   50         int             txa_pkts;       /* packets over last sample interval */
   51         int             txa_avgpps;     /* filtered traffic over window */
   52         int             txa_qbytes;     /* data queued (bytes) */
   53         short           txa_qframes;    /* data queued (frames) */
   54         ieee80211_seq   txa_start;      /* BA window left edge */
   55         ieee80211_seq   txa_seqpending; /* new txa_start pending BAR response */
   56         uint16_t        txa_wnd;        /* BA window size */
   57         uint8_t         txa_attempts;   /* # ADDBA/BAR requests w/o a response*/
   58         int             txa_nextrequest;/* soonest to make next request */
   59         struct callout  txa_timer;
   60         void            *txa_private;   /* driver-private storage */
   61         uint64_t        txa_pad[4];
   62 };
   63 
   64 /* return non-zero if AMPDU tx for the TID is running */
   65 #define IEEE80211_AMPDU_RUNNING(tap) \
   66         (((tap)->txa_flags & IEEE80211_AGGR_RUNNING) != 0)
   67 
   68 /* return non-zero if AMPDU tx for the TID is running or started */
   69 #define IEEE80211_AMPDU_REQUESTED(tap) \
   70         (((tap)->txa_flags & \
   71          (IEEE80211_AGGR_RUNNING|IEEE80211_AGGR_XCHGPEND|IEEE80211_AGGR_NAK)) != 0)
   72 
   73 #define IEEE80211_AGGR_BITS \
   74         "\2\1IMMEDIATE\2XCHGPEND\3RUNNING\4SETUP\5NAK"
   75 
   76 /*
   77  * Traffic estimator support.  We estimate packets/sec for
   78  * each AC that is setup for AMPDU or will potentially be
   79  * setup for AMPDU.  The traffic rate can be used to decide
   80  * when AMPDU should be setup (according to a threshold)
   81  * and is available for drivers to do things like cache
   82  * eviction when only a limited number of BA streams are
   83  * available and more streams are requested than available.
   84  */
   85 
   86 static __inline void
   87 ieee80211_txampdu_update_pps(struct ieee80211_tx_ampdu *tap)
   88 {
   89         /* NB: scale factor of 2 was picked heuristically */
   90         tap->txa_avgpps = ((tap->txa_avgpps << 2) -
   91              tap->txa_avgpps + tap->txa_pkts) >> 2;
   92 }
   93 
   94 /*
   95  * Count a packet towards the pps estimate.
   96  */
   97 static __inline void
   98 ieee80211_txampdu_count_packet(struct ieee80211_tx_ampdu *tap)
   99 {
  100         /* XXX bound loop/do more crude estimate? */
  101         while (ticks - tap->txa_lastsample >= hz) {
  102                 ieee80211_txampdu_update_pps(tap);
  103                 /* reset to start new sample interval */
  104                 tap->txa_pkts = 0;
  105                 if (tap->txa_avgpps == 0) {
  106                         tap->txa_lastsample = ticks;
  107                         break;
  108                 }
  109                 tap->txa_lastsample += hz;
  110         }
  111         tap->txa_pkts++;
  112 }
  113 
  114 /*
  115  * Get the current pps estimate.  If the average is out of
  116  * date due to lack of traffic then we decay the estimate
  117  * to account for the idle time.
  118  */
  119 static __inline int
  120 ieee80211_txampdu_getpps(struct ieee80211_tx_ampdu *tap)
  121 {
  122         /* XXX bound loop/do more crude estimate? */
  123         while (ticks - tap->txa_lastsample >= hz) {
  124                 ieee80211_txampdu_update_pps(tap);
  125                 tap->txa_pkts = 0;
  126                 if (tap->txa_avgpps == 0) {
  127                         tap->txa_lastsample = ticks;
  128                         break;
  129                 }
  130                 tap->txa_lastsample += hz;
  131         }
  132         return tap->txa_avgpps;
  133 }
  134 
  135 struct ieee80211_rx_ampdu {
  136         int             rxa_flags;
  137         int             rxa_qbytes;     /* data queued (bytes) */
  138         short           rxa_qframes;    /* data queued (frames) */
  139         ieee80211_seq   rxa_seqstart;
  140         ieee80211_seq   rxa_start;      /* start of current BA window */
  141         uint16_t        rxa_wnd;        /* BA window size */
  142         int             rxa_age;        /* age of oldest frame in window */
  143         int             rxa_nframes;    /* frames since ADDBA */
  144         struct mbuf *rxa_m[IEEE80211_AGGR_BAWMAX];
  145         void            *rxa_private;
  146         uint64_t        rxa_pad[3];
  147 };
  148 
  149 void    ieee80211_ht_attach(struct ieee80211com *);
  150 void    ieee80211_ht_detach(struct ieee80211com *);
  151 void    ieee80211_ht_vattach(struct ieee80211vap *);
  152 void    ieee80211_ht_vdetach(struct ieee80211vap *);
  153 
  154 void    ieee80211_ht_announce(struct ieee80211com *);
  155 
  156 struct ieee80211_mcs_rates {
  157         uint16_t        ht20_rate_800ns;
  158         uint16_t        ht20_rate_400ns;
  159         uint16_t        ht40_rate_800ns;
  160         uint16_t        ht40_rate_400ns;
  161 };
  162 extern const struct ieee80211_mcs_rates ieee80211_htrates[];
  163 const struct ieee80211_htrateset *ieee80211_get_suphtrates(
  164                 struct ieee80211com *, const struct ieee80211_channel *);
  165 
  166 struct ieee80211_node;
  167 int     ieee80211_setup_htrates(struct ieee80211_node *,
  168                 const uint8_t *htcap, int flags);
  169 void    ieee80211_setup_basic_htrates(struct ieee80211_node *,
  170                 const uint8_t *htinfo);
  171 struct mbuf *ieee80211_decap_amsdu(struct ieee80211_node *, struct mbuf *);
  172 int     ieee80211_ampdu_reorder(struct ieee80211_node *, struct mbuf *);
  173 void    ieee80211_recv_bar(struct ieee80211_node *, struct mbuf *);
  174 void    ieee80211_ht_node_init(struct ieee80211_node *);
  175 void    ieee80211_ht_node_cleanup(struct ieee80211_node *);
  176 void    ieee80211_ht_node_age(struct ieee80211_node *);
  177 
  178 struct ieee80211_channel *ieee80211_ht_adjust_channel(struct ieee80211com *,
  179                 struct ieee80211_channel *, int);
  180 void    ieee80211_ht_wds_init(struct ieee80211_node *);
  181 void    ieee80211_ht_node_join(struct ieee80211_node *);
  182 void    ieee80211_ht_node_leave(struct ieee80211_node *);
  183 void    ieee80211_htprot_update(struct ieee80211com *, int protmode);
  184 void    ieee80211_ht_timeout(struct ieee80211com *);
  185 void    ieee80211_parse_htcap(struct ieee80211_node *, const uint8_t *);
  186 void    ieee80211_parse_htinfo(struct ieee80211_node *, const uint8_t *);
  187 void    ieee80211_ht_updateparams(struct ieee80211_node *, const uint8_t *,
  188                 const uint8_t *);
  189 void    ieee80211_ht_updatehtcap(struct ieee80211_node *, const uint8_t *);
  190 int     ieee80211_ampdu_request(struct ieee80211_node *,
  191                 struct ieee80211_tx_ampdu *);
  192 void    ieee80211_ampdu_stop(struct ieee80211_node *,
  193                 struct ieee80211_tx_ampdu *, int);
  194 int     ieee80211_send_bar(struct ieee80211_node *, struct ieee80211_tx_ampdu *,
  195                 ieee80211_seq);
  196 uint8_t *ieee80211_add_htcap(uint8_t *, struct ieee80211_node *);
  197 uint8_t *ieee80211_add_htcap_vendor(uint8_t *, struct ieee80211_node *);
  198 uint8_t *ieee80211_add_htinfo(uint8_t *, struct ieee80211_node *);
  199 uint8_t *ieee80211_add_htinfo_vendor(uint8_t *, struct ieee80211_node *);
  200 struct ieee80211_beacon_offsets;
  201 void    ieee80211_ht_update_beacon(struct ieee80211vap *,
  202                 struct ieee80211_beacon_offsets *);
  203 #endif /* _NET80211_IEEE80211_HT_H_ */

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