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/* $OpenBSD: ieee80211_ra.h,v 1.2 2021/10/11 09:01:06 stsp Exp $ */
/*
* Copyright (c) 2021 Christian Ehrhardt <ehrhardt@genua.de>
* Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Goodput statistics struct. Measures the effective data rate of an MCS.
* All uint64_t numbers in this struct use fixed-point arithmetic.
*/
struct ieee80211_ra_goodput_stats {
uint64_t measured; /* Most recently measured goodput. */
uint64_t average; /* Average measured goodput. */
uint64_t stddeviation; /* Goodput standard deviation. */
uint64_t loss; /* This rate's loss percentage SFER. */
uint32_t nprobe_pkts; /* Number of packets in current probe. */
uint32_t nprobe_fail; /* Number of failed packets. */
};
/*
* Rate adaptation state.
*
* Drivers should not modify any fields of this structure directly.
* Use ieee80211_ra_init() and ieee80211_ra_add_stats() only.
*/
struct ieee80211_ra_node {
/* Bitmaps MCS 0-31. */
uint32_t valid_probes;
uint32_t valid_rates;
uint32_t candidate_rates;
uint32_t probed_rates;
/* Probing state. */
int probing;
#define IEEE80211_RA_NOT_PROBING 0x0
#define IEEE80211_RA_PROBING_DOWN 0x1
#define IEEE80211_RA_PROBING_UP 0x2
#define IEEE80211_RA_PROBING_INTER 0x4 /* combined with UP or DOWN */
/* The current best MCS found by probing. */
int best_mcs;
/* Goodput statistics for each MCS. */
struct ieee80211_ra_goodput_stats g[IEEE80211_HT_RATESET_NUM_MCS];
};
/* Initialize rate adaptation state. */
void ieee80211_ra_node_init(struct ieee80211_ra_node *);
/*
* Drivers report information about 802.11n/HT Tx attempts here.
* mcs: The HT MCS used during this Tx attempt.
* total: How many Tx attempts (initial attempt + any retries) were made?
* fail: How many of these Tx attempts failed?
*/
void ieee80211_ra_add_stats_ht(struct ieee80211_ra_node *,
struct ieee80211com *, struct ieee80211_node *,
int mcs, unsigned int total, unsigned int fail);
/* Drivers call this function to update ni->ni_txmcs. */
void ieee80211_ra_choose(struct ieee80211_ra_node *,
struct ieee80211com *, struct ieee80211_node *);
/* Get the HT rateset for a particular HT MCS with 40MHz and/or SGI on/off. */
const struct ieee80211_ht_rateset * ieee80211_ra_get_ht_rateset(int mcs,
int chan40, int sgi);
/* Check whether SGI should be used. */
int ieee80211_ra_use_ht_sgi(struct ieee80211_node *);
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