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_ht.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_ht.h 326272 2017-11-27 15:23:17Z pfg $
   28  */
   29 #ifndef _NET80211_IEEE80211_HT_H_
   30 #define _NET80211_IEEE80211_HT_H_
   31 
   32 /*
   33  * 802.11n protocol implementation definitions.
   34  */
   35 
   36 #define IEEE80211_AGGR_BAWMAX   64      /* max block ack window size */
   37 /* threshold for aging overlapping non-HT bss */
   38 #define IEEE80211_NONHT_PRESENT_AGE     msecs_to_ticks(60*1000)
   39 
   40 struct ieee80211_tx_ampdu {
   41         struct ieee80211_node *txa_ni;  /* back pointer */
   42         u_short         txa_flags;
   43 #define IEEE80211_AGGR_IMMEDIATE        0x0001  /* BA policy */
   44 #define IEEE80211_AGGR_XCHGPEND         0x0002  /* ADDBA response pending */
   45 #define IEEE80211_AGGR_RUNNING          0x0004  /* ADDBA response received */
   46 #define IEEE80211_AGGR_SETUP            0x0008  /* deferred state setup */
   47 #define IEEE80211_AGGR_NAK              0x0010  /* peer NAK'd ADDBA request */
   48 #define IEEE80211_AGGR_BARPEND          0x0020  /* BAR response pending */
   49 #define IEEE80211_AGGR_WAITRX           0x0040  /* Wait for first RX frame to define BAW */
   50         uint8_t         txa_tid;
   51         uint8_t         txa_token;      /* dialog token */
   52         int             txa_lastsample; /* ticks @ last traffic sample */
   53         int             txa_pkts;       /* packets over last sample interval */
   54         int             txa_avgpps;     /* filtered traffic over window */
   55         int             txa_qbytes;     /* data queued (bytes) */
   56         short           txa_qframes;    /* data queued (frames) */
   57         ieee80211_seq   txa_start;      /* BA window left edge */
   58         ieee80211_seq   txa_seqpending; /* new txa_start pending BAR response */
   59         uint16_t        txa_wnd;        /* BA window size */
   60         uint8_t         txa_attempts;   /* # ADDBA/BAR requests w/o a response*/
   61         int             txa_nextrequest;/* soonest to make next request */
   62         struct callout  txa_timer;
   63         void            *txa_private;   /* driver-private storage */
   64         uint64_t        txa_pad[4];
   65 };
   66 
   67 /* return non-zero if AMPDU tx for the TID is running */
   68 #define IEEE80211_AMPDU_RUNNING(tap) \
   69         (((tap)->txa_flags & IEEE80211_AGGR_RUNNING) != 0)
   70 
   71 /* return non-zero if AMPDU tx for the TID was NACKed */
   72 #define IEEE80211_AMPDU_NACKED(tap)\
   73         (!! ((tap)->txa_flags & IEEE80211_AGGR_NAK))
   74 
   75 /* return non-zero if AMPDU tx for the TID is running or started */
   76 #define IEEE80211_AMPDU_REQUESTED(tap) \
   77         (((tap)->txa_flags & \
   78          (IEEE80211_AGGR_RUNNING|IEEE80211_AGGR_XCHGPEND|IEEE80211_AGGR_NAK)) != 0)
   79 
   80 #define IEEE80211_AGGR_BITS \
   81         "\2\1IMMEDIATE\2XCHGPEND\3RUNNING\4SETUP\5NAK"
   82 
   83 /*
   84  * Traffic estimator support.  We estimate packets/sec for
   85  * each AC that is setup for AMPDU or will potentially be
   86  * setup for AMPDU.  The traffic rate can be used to decide
   87  * when AMPDU should be setup (according to a threshold)
   88  * and is available for drivers to do things like cache
   89  * eviction when only a limited number of BA streams are
   90  * available and more streams are requested than available.
   91  */
   92 
   93 static __inline void
   94 ieee80211_txampdu_init_pps(struct ieee80211_tx_ampdu *tap)
   95 {
   96         /*
   97          * Reset packet estimate.
   98          */
   99         tap->txa_lastsample = ticks;
  100         tap->txa_avgpps = 0;
  101 }
  102 
  103 static __inline void
  104 ieee80211_txampdu_update_pps(struct ieee80211_tx_ampdu *tap)
  105 {
  106 
  107         /* NB: scale factor of 2 was picked heuristically */
  108         tap->txa_avgpps = ((tap->txa_avgpps << 2) -
  109              tap->txa_avgpps + tap->txa_pkts) >> 2;
  110 }
  111 
  112 /*
  113  * Count a packet towards the pps estimate.
  114  */
  115 static __inline void
  116 ieee80211_txampdu_count_packet(struct ieee80211_tx_ampdu *tap)
  117 {
  118 
  119         /* XXX bound loop/do more crude estimate? */
  120         while (ticks - tap->txa_lastsample >= hz) {
  121                 ieee80211_txampdu_update_pps(tap);
  122                 /* reset to start new sample interval */
  123                 tap->txa_pkts = 0;
  124                 if (tap->txa_avgpps == 0) {
  125                         tap->txa_lastsample = ticks;
  126                         break;
  127                 }
  128                 tap->txa_lastsample += hz;
  129         }
  130         tap->txa_pkts++;
  131 }
  132 
  133 /*
  134  * Get the current pps estimate.  If the average is out of
  135  * date due to lack of traffic then we decay the estimate
  136  * to account for the idle time.
  137  */
  138 static __inline int
  139 ieee80211_txampdu_getpps(struct ieee80211_tx_ampdu *tap)
  140 {
  141         /* XXX bound loop/do more crude estimate? */
  142         while (ticks - tap->txa_lastsample >= hz) {
  143                 ieee80211_txampdu_update_pps(tap);
  144                 tap->txa_pkts = 0;
  145                 if (tap->txa_avgpps == 0) {
  146                         tap->txa_lastsample = ticks;
  147                         break;
  148                 }
  149                 tap->txa_lastsample += hz;
  150         }
  151         return tap->txa_avgpps;
  152 }
  153 
  154 struct ieee80211_rx_ampdu {
  155         int             rxa_flags;
  156         int             rxa_qbytes;     /* data queued (bytes) */
  157         short           rxa_qframes;    /* data queued (frames) */
  158         ieee80211_seq   rxa_seqstart;
  159         ieee80211_seq   rxa_start;      /* start of current BA window */
  160         uint16_t        rxa_wnd;        /* BA window size */
  161         int             rxa_age;        /* age of oldest frame in window */
  162         int             rxa_nframes;    /* frames since ADDBA */
  163         struct mbuf *rxa_m[IEEE80211_AGGR_BAWMAX];
  164         void            *rxa_private;
  165         uint64_t        rxa_pad[3];
  166 };
  167 
  168 void    ieee80211_ht_attach(struct ieee80211com *);
  169 void    ieee80211_ht_detach(struct ieee80211com *);
  170 void    ieee80211_ht_vattach(struct ieee80211vap *);
  171 void    ieee80211_ht_vdetach(struct ieee80211vap *);
  172 
  173 void    ieee80211_ht_announce(struct ieee80211com *);
  174 
  175 struct ieee80211_mcs_rates {
  176         uint16_t        ht20_rate_800ns;
  177         uint16_t        ht20_rate_400ns;
  178         uint16_t        ht40_rate_800ns;
  179         uint16_t        ht40_rate_400ns;
  180 };
  181 extern const struct ieee80211_mcs_rates ieee80211_htrates[];
  182 void    ieee80211_init_suphtrates(struct ieee80211com *);
  183 
  184 struct ieee80211_node;
  185 int     ieee80211_setup_htrates(struct ieee80211_node *,
  186                 const uint8_t *htcap, int flags);
  187 void    ieee80211_setup_basic_htrates(struct ieee80211_node *,
  188                 const uint8_t *htinfo);
  189 struct mbuf *ieee80211_decap_amsdu(struct ieee80211_node *, struct mbuf *);
  190 int     ieee80211_ampdu_reorder(struct ieee80211_node *, struct mbuf *,
  191             const struct ieee80211_rx_stats *);
  192 void    ieee80211_recv_bar(struct ieee80211_node *, struct mbuf *);
  193 void    ieee80211_ht_node_init(struct ieee80211_node *);
  194 void    ieee80211_ht_node_cleanup(struct ieee80211_node *);
  195 void    ieee80211_ht_node_age(struct ieee80211_node *);
  196 
  197 struct ieee80211_channel *ieee80211_ht_adjust_channel(struct ieee80211com *,
  198                 struct ieee80211_channel *, int);
  199 void    ieee80211_ht_wds_init(struct ieee80211_node *);
  200 void    ieee80211_ht_node_join(struct ieee80211_node *);
  201 void    ieee80211_ht_node_leave(struct ieee80211_node *);
  202 void    ieee80211_htprot_update(struct ieee80211com *, int protmode);
  203 void    ieee80211_ht_timeout(struct ieee80211com *);
  204 void    ieee80211_parse_htcap(struct ieee80211_node *, const uint8_t *);
  205 void    ieee80211_parse_htinfo(struct ieee80211_node *, const uint8_t *);
  206 void    ieee80211_ht_updateparams(struct ieee80211_node *, const uint8_t *,
  207                 const uint8_t *);
  208 int     ieee80211_ht_updateparams_final(struct ieee80211_node *,
  209             const uint8_t *, const uint8_t *);
  210 void    ieee80211_ht_updatehtcap(struct ieee80211_node *, const uint8_t *);
  211 void    ieee80211_ht_updatehtcap_final(struct ieee80211_node *);
  212 int     ieee80211_ampdu_request(struct ieee80211_node *,
  213                 struct ieee80211_tx_ampdu *);
  214 void    ieee80211_ampdu_stop(struct ieee80211_node *,
  215                 struct ieee80211_tx_ampdu *, int);
  216 int     ieee80211_send_bar(struct ieee80211_node *, struct ieee80211_tx_ampdu *,
  217                 ieee80211_seq);
  218 uint8_t *ieee80211_add_htcap(uint8_t *, struct ieee80211_node *);
  219 uint8_t *ieee80211_add_htcap_ch(uint8_t *, struct ieee80211vap *,
  220             struct ieee80211_channel *);
  221 uint8_t *ieee80211_add_htcap_vendor(uint8_t *, struct ieee80211_node *);
  222 uint8_t *ieee80211_add_htinfo(uint8_t *, struct ieee80211_node *);
  223 uint8_t *ieee80211_add_htinfo_vendor(uint8_t *, struct ieee80211_node *);
  224 struct ieee80211_beacon_offsets;
  225 void    ieee80211_ht_update_beacon(struct ieee80211vap *,
  226                 struct ieee80211_beacon_offsets *);
  227 int     ieee80211_ampdu_rx_start_ext(struct ieee80211_node *ni, int tid,
  228             int seq, int baw);
  229 void    ieee80211_ampdu_rx_stop_ext(struct ieee80211_node *ni, int tid);
  230 int     ieee80211_ampdu_tx_request_ext(struct ieee80211_node *ni, int tid);
  231 int     ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node *ni,
  232             int tid, int status);
  233 
  234 #endif /* _NET80211_IEEE80211_HT_H_ */

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