1 /* $OpenBSD: ieee80211_ra.h,v 1.2 2021/10/11 09:01:06 stsp Exp $ */ 2 3 /* 4 * Copyright (c) 2021 Christian Ehrhardt <ehrhardt@genua.de> 5 * Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* 21 * Goodput statistics struct. Measures the effective data rate of an MCS. 22 * All uint64_t numbers in this struct use fixed-point arithmetic. 23 */ 24 struct ieee80211_ra_goodput_stats { 25 uint64_t measured; /* Most recently measured goodput. */ 26 uint64_t average; /* Average measured goodput. */ 27 uint64_t stddeviation; /* Goodput standard deviation. */ 28 uint64_t loss; /* This rate's loss percentage SFER. */ 29 uint32_t nprobe_pkts; /* Number of packets in current probe. */ 30 uint32_t nprobe_fail; /* Number of failed packets. */ 31 }; 32 33 /* 34 * Rate adaptation state. 35 * 36 * Drivers should not modify any fields of this structure directly. 37 * Use ieee80211_ra_init() and ieee80211_ra_add_stats() only. 38 */ 39 struct ieee80211_ra_node { 40 /* Bitmaps MCS 0-31. */ 41 uint32_t valid_probes; 42 uint32_t valid_rates; 43 uint32_t candidate_rates; 44 uint32_t probed_rates; 45 46 /* Probing state. */ 47 int probing; 48 #define IEEE80211_RA_NOT_PROBING 0x0 49 #define IEEE80211_RA_PROBING_DOWN 0x1 50 #define IEEE80211_RA_PROBING_UP 0x2 51 #define IEEE80211_RA_PROBING_INTER 0x4 /* combined with UP or DOWN */ 52 53 /* The current best MCS found by probing. */ 54 int best_mcs; 55 56 /* Goodput statistics for each MCS. */ 57 struct ieee80211_ra_goodput_stats g[IEEE80211_HT_RATESET_NUM_MCS]; 58 }; 59 60 /* Initialize rate adaptation state. */ 61 void ieee80211_ra_node_init(struct ieee80211_ra_node *); 62 63 /* 64 * Drivers report information about 802.11n/HT Tx attempts here. 65 * mcs: The HT MCS used during this Tx attempt. 66 * total: How many Tx attempts (initial attempt + any retries) were made? 67 * fail: How many of these Tx attempts failed? 68 */ 69 void ieee80211_ra_add_stats_ht(struct ieee80211_ra_node *, 70 struct ieee80211com *, struct ieee80211_node *, 71 int mcs, unsigned int total, unsigned int fail); 72 73 /* Drivers call this function to update ni->ni_txmcs. */ 74 void ieee80211_ra_choose(struct ieee80211_ra_node *, 75 struct ieee80211com *, struct ieee80211_node *); 76 77 /* Get the HT rateset for a particular HT MCS with 40MHz and/or SGI on/off. */ 78 const struct ieee80211_ht_rateset * ieee80211_ra_get_ht_rateset(int mcs, 79 int chan40, int sgi); 80 81 /* Check whether SGI should be used. */ 82 int ieee80211_ra_use_ht_sgi(struct ieee80211_node *); 83