207 lines
7.9 KiB
C
207 lines
7.9 KiB
C
/*-
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* Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NET80211_IEEE80211_HT_H_
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#define _NET80211_IEEE80211_HT_H_
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/*
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* 802.11n protocol implementation definitions.
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*/
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#define IEEE80211_AGGR_BAWMAX 64 /* max block ack window size */
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/* threshold for aging overlapping non-HT bss */
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#define IEEE80211_NONHT_PRESENT_AGE msecs_to_ticks(60*1000)
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typedef uint16_t ieee80211_seq;
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struct ieee80211_tx_ampdu {
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struct ieee80211_node *txa_ni; /* back pointer */
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u_short txa_flags;
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#define IEEE80211_AGGR_IMMEDIATE 0x0001 /* BA policy */
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#define IEEE80211_AGGR_XCHGPEND 0x0002 /* ADDBA response pending */
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#define IEEE80211_AGGR_RUNNING 0x0004 /* ADDBA response received */
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#define IEEE80211_AGGR_SETUP 0x0008 /* deferred state setup */
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#define IEEE80211_AGGR_NAK 0x0010 /* peer NAK'd ADDBA request */
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#define IEEE80211_AGGR_BARPEND 0x0020 /* BAR response pending */
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uint8_t txa_ac;
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uint8_t txa_token; /* dialog token */
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int txa_lastsample; /* ticks @ last traffic sample */
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int txa_pkts; /* packets over last sample interval */
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int txa_avgpps; /* filtered traffic over window */
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int txa_qbytes; /* data queued (bytes) */
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short txa_qframes; /* data queued (frames) */
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ieee80211_seq txa_start; /* BA window left edge */
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ieee80211_seq txa_seqpending; /* new txa_start pending BAR response */
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uint16_t txa_wnd; /* BA window size */
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uint8_t txa_attempts; /* # ADDBA/BAR requests w/o a response*/
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int txa_nextrequest;/* soonest to make next request */
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struct callout txa_timer;
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void *txa_private; /* driver-private storage */
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};
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/* return non-zero if AMPDU tx for the TID is running */
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#define IEEE80211_AMPDU_RUNNING(tap) \
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(((tap)->txa_flags & IEEE80211_AGGR_RUNNING) != 0)
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/* return non-zero if AMPDU tx for the TID is running or started */
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#define IEEE80211_AMPDU_REQUESTED(tap) \
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(((tap)->txa_flags & \
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(IEEE80211_AGGR_RUNNING|IEEE80211_AGGR_XCHGPEND|IEEE80211_AGGR_NAK)) != 0)
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#define IEEE80211_AGGR_BITS \
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"\20\1IMMEDIATE\2XCHGPEND\3RUNNING\4SETUP\5NAK"
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/*
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* Traffic estimator support. We estimate packets/sec for
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* each AC that is setup for AMPDU or will potentially be
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* setup for AMPDU. The traffic rate can be used to decide
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* when AMPDU should be setup (according to a threshold)
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* and is available for drivers to do things like cache
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* eviction when only a limited number of BA streams are
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* available and more streams are requested than available.
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*/
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static __inline void
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ieee80211_txampdu_update_pps(struct ieee80211_tx_ampdu *tap)
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{
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/* NB: scale factor of 2 was picked heuristically */
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tap->txa_avgpps = ((tap->txa_avgpps << 2) -
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tap->txa_avgpps + tap->txa_pkts) >> 2;
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}
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/*
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* Count a packet towards the pps estimate.
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*/
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static __inline void
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ieee80211_txampdu_count_packet(struct ieee80211_tx_ampdu *tap)
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{
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/* XXX bound loop/do more crude estimate? */
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while (ticks - tap->txa_lastsample >= hz) {
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ieee80211_txampdu_update_pps(tap);
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/* reset to start new sample interval */
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tap->txa_pkts = 0;
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if (tap->txa_avgpps == 0) {
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tap->txa_lastsample = ticks;
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break;
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}
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tap->txa_lastsample += hz;
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}
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tap->txa_pkts++;
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}
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/*
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* Get the current pps estimate. If the average is out of
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* date due to lack of traffic then we decay the estimate
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* to account for the idle time.
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*/
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static __inline int
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ieee80211_txampdu_getpps(struct ieee80211_tx_ampdu *tap)
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{
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/* XXX bound loop/do more crude estimate? */
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while (ticks - tap->txa_lastsample >= hz) {
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ieee80211_txampdu_update_pps(tap);
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tap->txa_pkts = 0;
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if (tap->txa_avgpps == 0) {
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tap->txa_lastsample = ticks;
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break;
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}
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tap->txa_lastsample += hz;
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}
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return tap->txa_avgpps;
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}
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struct ieee80211_rx_ampdu {
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int rxa_flags;
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int rxa_qbytes; /* data queued (bytes) */
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short rxa_qframes; /* data queued (frames) */
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ieee80211_seq rxa_seqstart;
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ieee80211_seq rxa_start; /* start of current BA window */
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uint16_t rxa_wnd; /* BA window size */
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int rxa_age; /* age of oldest frame in window */
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int rxa_nframes; /* frames since ADDBA */
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struct mbuf *rxa_m[IEEE80211_AGGR_BAWMAX];
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};
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void ieee80211_ht_attach(struct ieee80211com *);
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void ieee80211_ht_detach(struct ieee80211com *);
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void ieee80211_ht_vattach(struct ieee80211vap *);
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void ieee80211_ht_vdetach(struct ieee80211vap *);
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void ieee80211_ht_announce(struct ieee80211com *);
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struct ieee80211_mcs_rates {
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uint16_t ht20_rate_800ns;
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uint16_t ht20_rate_400ns;
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uint16_t ht40_rate_800ns;
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uint16_t ht40_rate_400ns;
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};
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extern const struct ieee80211_mcs_rates ieee80211_htrates[16];
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const struct ieee80211_htrateset *ieee80211_get_suphtrates(
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struct ieee80211com *, const struct ieee80211_channel *);
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struct ieee80211_node;
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int ieee80211_setup_htrates(struct ieee80211_node *,
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const uint8_t *htcap, int flags);
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void ieee80211_setup_basic_htrates(struct ieee80211_node *,
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const uint8_t *htinfo);
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struct mbuf *ieee80211_decap_amsdu(struct ieee80211_node *, struct mbuf *);
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int ieee80211_ampdu_reorder(struct ieee80211_node *, struct mbuf *);
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void ieee80211_recv_bar(struct ieee80211_node *, struct mbuf *);
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void ieee80211_ht_node_init(struct ieee80211_node *);
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void ieee80211_ht_node_cleanup(struct ieee80211_node *);
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void ieee80211_ht_node_age(struct ieee80211_node *);
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struct ieee80211_channel *ieee80211_ht_adjust_channel(struct ieee80211com *,
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struct ieee80211_channel *, int);
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void ieee80211_ht_wds_init(struct ieee80211_node *);
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void ieee80211_ht_node_join(struct ieee80211_node *);
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void ieee80211_ht_node_leave(struct ieee80211_node *);
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void ieee80211_htprot_update(struct ieee80211com *, int protmode);
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void ieee80211_ht_timeout(struct ieee80211com *);
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void ieee80211_parse_htcap(struct ieee80211_node *, const uint8_t *);
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void ieee80211_parse_htinfo(struct ieee80211_node *, const uint8_t *);
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void ieee80211_ht_updateparams(struct ieee80211_node *, const uint8_t *,
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const uint8_t *);
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void ieee80211_ht_updatehtcap(struct ieee80211_node *, const uint8_t *);
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void ieee80211_recv_action(struct ieee80211_node *,
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const uint8_t *, const uint8_t *);
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int ieee80211_ampdu_request(struct ieee80211_node *,
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struct ieee80211_tx_ampdu *);
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void ieee80211_ampdu_stop(struct ieee80211_node *,
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struct ieee80211_tx_ampdu *, int);
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int ieee80211_send_bar(struct ieee80211_node *, struct ieee80211_tx_ampdu *,
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ieee80211_seq);
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int ieee80211_send_action(struct ieee80211_node *,
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int, int, uint16_t [4]);
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uint8_t *ieee80211_add_htcap(uint8_t *, struct ieee80211_node *);
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uint8_t *ieee80211_add_htcap_vendor(uint8_t *, struct ieee80211_node *);
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uint8_t *ieee80211_add_htinfo(uint8_t *, struct ieee80211_node *);
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uint8_t *ieee80211_add_htinfo_vendor(uint8_t *, struct ieee80211_node *);
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struct ieee80211_beacon_offsets;
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void ieee80211_ht_update_beacon(struct ieee80211vap *,
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struct ieee80211_beacon_offsets *);
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#endif /* _NET80211_IEEE80211_HT_H_ */
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