/* $OpenBSD: ieee80211_amrr.c,v 1.9 2015/11/15 13:20:16 stsp Exp $ */ /*- * Copyright (c) 2006 * Damien Bergamini * * 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. */ #include #include #include #include #include #include #include #include #include #include #include #define is_success(amn) \ ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10) #define is_failure(amn) \ ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3) #define is_enough(amn) \ ((amn)->amn_txcnt > 10) #define reset_cnt(amn) \ do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0) /* * XXX In HT mode we only support MCS 0-7, for now. * Beyond MCS 7, incrementing the MCS index does not imply a * higher data rate, so this simple implementation will need * to be enhanced. */ static inline int is_min_rate(struct ieee80211_node *ni) { #ifndef IEEE80211_NO_HT if (ni->ni_flags & IEEE80211_NODE_HT) return (ni->ni_txmcs == 0); #endif return (ni->ni_txrate == 0); } static inline int is_max_rate(struct ieee80211_node *ni) { #ifndef IEEE80211_NO_HT if (ni->ni_flags & IEEE80211_NODE_HT) return (ni->ni_txmcs == 7); /* XXX up to MCS 7 only */ #endif return (ni->ni_txrate == ni->ni_rates.rs_nrates - 1); } static inline void increase_rate(struct ieee80211_node *ni) { #ifndef IEEE80211_NO_HT if (ni->ni_flags & IEEE80211_NODE_HT) ni->ni_txmcs++; else #endif ni->ni_txrate++; } static inline void decrease_rate(struct ieee80211_node *ni) { #ifndef IEEE80211_NO_HT if (ni->ni_flags & IEEE80211_NODE_HT) ni->ni_txmcs--; else #endif ni->ni_txrate--; } void ieee80211_amrr_node_init(const struct ieee80211_amrr *amrr, struct ieee80211_amrr_node *amn) { amn->amn_success = 0; amn->amn_recovery = 0; amn->amn_txcnt = amn->amn_retrycnt = 0; amn->amn_success_threshold = amrr->amrr_min_success_threshold; } /* * Update ni->ni_txrate. */ void ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni, struct ieee80211_amrr_node *amn) { #define RV(rate) ((rate) & IEEE80211_RATE_VAL) int need_change = 0; if (is_success(amn) && is_enough(amn)) { amn->amn_success++; if (amn->amn_success >= amn->amn_success_threshold && !is_max_rate(ni)) { amn->amn_recovery = 1; amn->amn_success = 0; increase_rate(ni); DPRINTF(("increase rate=%d,#tx=%d,#retries=%d\n", RV(ni->ni_rates.rs_rates[ni->ni_txrate]), amn->amn_txcnt, amn->amn_retrycnt)); need_change = 1; } else { amn->amn_recovery = 0; } } else if (is_failure(amn)) { amn->amn_success = 0; if (!is_min_rate(ni)) { if (amn->amn_recovery) { amn->amn_success_threshold *= 2; if (amn->amn_success_threshold > amrr->amrr_max_success_threshold) amn->amn_success_threshold = amrr->amrr_max_success_threshold; } else { amn->amn_success_threshold = amrr->amrr_min_success_threshold; } decrease_rate(ni); DPRINTF(("decrease rate=%d,#tx=%d,#retries=%d\n", RV(ni->ni_rates.rs_rates[ni->ni_txrate]), amn->amn_txcnt, amn->amn_retrycnt)); need_change = 1; } amn->amn_recovery = 0; } if (is_enough(amn) || need_change) reset_cnt(amn); #undef RV }