1 /* $NetBSD: ieee80211_amrr.c,v 1.3 2015/08/24 20:58:47 pooka Exp $ */ 2 /* $OpenBSD: ieee80211_amrr.c,v 1.1 2006/06/17 19:07:19 damien Exp $ */ 3 4 /*- 5 * Copyright (c) 2006 6 * Damien Bergamini <damien.bergamini@free.fr> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include <sys/cdefs.h> 22 __KERNEL_RCSID(0, "$NetBSD: ieee80211_amrr.c,v 1.3 2015/08/24 20:58:47 pooka Exp $"); 23 24 #ifdef _KERNEL_OPT 25 #include "opt_inet.h" 26 #endif 27 28 #include <sys/param.h> 29 #include <sys/kernel.h> 30 #include <sys/socket.h> 31 #include <sys/sysctl.h> 32 33 #include <net/if.h> 34 #include <net/if_ether.h> 35 #include <net/if_media.h> 36 37 #ifdef INET 38 #include <netinet/in.h> 39 #endif 40 41 #include <net80211/ieee80211.h> 42 #include <net80211/ieee80211_var.h> 43 #include <net80211/ieee80211_amrr.h> 44 45 #define is_success(amn) \ 46 ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10) 47 #define is_failure(amn) \ 48 ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3) 49 #define is_enough(amn) \ 50 ((amn)->amn_txcnt > 10) 51 #define is_min_rate(ni) \ 52 ((ni)->ni_txrate == 0) 53 #define is_max_rate(ni) \ 54 ((ni)->ni_txrate == (ni)->ni_rates.rs_nrates - 1) 55 #define increase_rate(ni) \ 56 ((ni)->ni_txrate++) 57 #define decrease_rate(ni) \ 58 ((ni)->ni_txrate--) 59 #define reset_cnt(amn) \ 60 do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0) 61 62 void 63 ieee80211_amrr_node_init(struct ieee80211_amrr *amrr, 64 struct ieee80211_amrr_node *amn) 65 { 66 amn->amn_success = 0; 67 amn->amn_recovery = 0; 68 amn->amn_txcnt = amn->amn_retrycnt = 0; 69 amn->amn_success_threshold = amrr->amrr_min_success_threshold; 70 } 71 72 /* 73 * Update ni->ni_txrate. 74 */ 75 void 76 ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni, 77 struct ieee80211_amrr_node *amn) 78 { 79 int need_change = 0; 80 81 if (is_success(amn) && is_enough(amn)) { 82 amn->amn_success++; 83 if (amn->amn_success >= amn->amn_success_threshold && 84 !is_max_rate(ni)) { 85 amn->amn_recovery = 1; 86 amn->amn_success = 0; 87 increase_rate(ni); 88 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG, 89 "AMRR increasing rate %d (txcnt=%d retrycnt=%d)\n", 90 ni->ni_rates.rs_rates[ni->ni_txrate] & 91 IEEE80211_RATE_VAL, 92 amn->amn_txcnt, amn->amn_retrycnt); 93 need_change = 1; 94 } else { 95 amn->amn_recovery = 0; 96 } 97 } else if (is_failure(amn)) { 98 amn->amn_success = 0; 99 if (!is_min_rate(ni)) { 100 if (amn->amn_recovery) { 101 amn->amn_success_threshold *= 2; 102 if (amn->amn_success_threshold > 103 amrr->amrr_max_success_threshold) 104 amn->amn_success_threshold = 105 amrr->amrr_max_success_threshold; 106 } else { 107 amn->amn_success_threshold = 108 amrr->amrr_min_success_threshold; 109 } 110 decrease_rate(ni); 111 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG, 112 "AMRR decreasing rate %d (txcnt=%d retrycnt=%d)\n", 113 ni->ni_rates.rs_rates[ni->ni_txrate] & 114 IEEE80211_RATE_VAL, 115 amn->amn_txcnt, amn->amn_retrycnt); 116 need_change = 1; 117 } 118 amn->amn_recovery = 0; 119 } 120 121 if (is_enough(amn) || need_change) 122 reset_cnt(amn); 123 } 124