92 lines
3.5 KiB
C
92 lines
3.5 KiB
C
/* $OpenBSD: ieee80211_ra_vht.h,v 1.1 2022/03/19 10:25:09 stsp Exp $ */
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/*
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* Copyright (c) 2021 Christian Ehrhardt <ehrhardt@genua.de>
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* Copyright (c) 2021, 2022 Stefan Sperling <stsp@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Goodput statistics struct. Measures the effective data rate of a rate.
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* All uint64_t numbers in this struct use fixed-point arithmetic.
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*/
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struct ieee80211_ra_vht_goodput_stats {
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uint64_t measured; /* Most recently measured goodput. */
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uint64_t average; /* Average measured goodput. */
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uint64_t stddeviation; /* Goodput standard deviation. */
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uint64_t loss; /* This rate's loss percentage SFER. */
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uint32_t nprobe_pkts; /* Number of packets in current probe. */
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uint32_t nprobe_fail; /* Number of failed packets. */
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};
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/*
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* Rate adaptation state.
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*
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* Drivers should not modify any fields of this structure directly.
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* Use ieee80211_ra_vht_init() and ieee80211_ra_vht_add_stats() only.
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*/
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struct ieee80211_ra_vht_node {
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/* Bitmaps for MCS 0-9 for a given number of spatial streams. */
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uint16_t valid_probes[IEEE80211_VHT_NUM_SS];
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uint16_t valid_rates[IEEE80211_VHT_NUM_SS];
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uint16_t candidate_rates[IEEE80211_VHT_NUM_SS];
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uint16_t probed_rates[IEEE80211_VHT_NUM_SS];
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/* Maximum usable MCS per given number of spatial streams. */
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int max_mcs[IEEE80211_VHT_NUM_SS];
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/* Probing state. */
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int probing;
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#define IEEE80211_RA_NOT_PROBING 0x0
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#define IEEE80211_RA_PROBING_DOWN 0x1
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#define IEEE80211_RA_PROBING_UP 0x2
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#define IEEE80211_RA_PROBING_INTER 0x4 /* combined with UP or DOWN */
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/* The current best MCS,NSS found by probing. */
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int best_mcs;
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int best_nss;
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/* Goodput statistics for each rate. */
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struct ieee80211_ra_vht_goodput_stats
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g[IEEE80211_VHT_NUM_RATESETS][IEEE80211_VHT_RATESET_MAX_NRATES];
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};
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/* Initialize rate adaptation state. */
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void ieee80211_ra_vht_node_init(struct ieee80211_ra_vht_node *);
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/*
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* Drivers report information about 802.11ac/VHT Tx attempts here.
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* mcs: The VHT MCS used during this Tx attempt.
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* nss: The number of spatial streams used during this Tx attempt.
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* total: How many Tx attempts (initial attempt + any retries) were made?
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* fail: How many of these Tx attempts failed?
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*/
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void ieee80211_ra_vht_add_stats(struct ieee80211_ra_vht_node *,
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struct ieee80211com *, struct ieee80211_node *,
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int mcs, int nss, unsigned int total, unsigned int fail);
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/* Drivers call this function to update ni->ni_txmcs and ni->ni_vht_ss. */
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void ieee80211_ra_vht_choose(struct ieee80211_ra_vht_node *,
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struct ieee80211com *, struct ieee80211_node *);
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/*
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* Get the VHT rateset for a particular VHT MCS, NSS, with 40MHz, 80MHz,
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* and/or SGI on/off.
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*/
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const struct ieee80211_vht_rateset * ieee80211_ra_vht_get_rateset(int mcs,
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int nss, int chan40, int chan80, int sgi);
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/* Check whether SGI should be used. */
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int ieee80211_ra_vht_use_sgi(struct ieee80211_node *);
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