1 /* $NetBSD: ieee80211_amrr.c,v 1.2 2007/12/11 12:40:10 lukem 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 1.2 2007/12/11 12:40:10 lukem Exp $"); 23 24 #include <sys/param.h> 25 #include <sys/kernel.h> 26 #include <sys/socket.h> 27 #include <sys/sysctl.h> 28 29 #include <net/if.h> 30 #include <net/if_media.h> 31 32 #ifdef INET 33 #include <netinet/in.h> 34 #include <netinet/if_ether.h> 35 #endif 36 37 #include <net80211/ieee80211.h> 38 #include <net80211/ieee80211_var.h> 39 #include <net80211/ieee80211_amrr.h> 40 41 #define is_success(amn) \ 42 ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10) 43 #define is_failure(amn) \ 44 ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3) 45 #define is_enough(amn) \ 46 ((amn)->amn_txcnt > 10) 47 #define is_min_rate(ni) \ 48 ((ni)->ni_txrate == 0) 49 #define is_max_rate(ni) \ 50 ((ni)->ni_txrate == (ni)->ni_rates.rs_nrates - 1) 51 #define increase_rate(ni) \ 52 ((ni)->ni_txrate++) 53 #define decrease_rate(ni) \ 54 ((ni)->ni_txrate--) 55 #define reset_cnt(amn) \ 56 do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0) 57 58 void 59 ieee80211_amrr_node_init(struct ieee80211_amrr *amrr, 60 struct ieee80211_amrr_node *amn) 61 { 62 amn->amn_success = 0; 63 amn->amn_recovery = 0; 64 amn->amn_txcnt = amn->amn_retrycnt = 0; 65 amn->amn_success_threshold = amrr->amrr_min_success_threshold; 66 } 67 68 /* 69 * Update ni->ni_txrate. 70 */ 71 void 72 ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni, 73 struct ieee80211_amrr_node *amn) 74 { 75 int need_change = 0; 76 77 if (is_success(amn) && is_enough(amn)) { 78 amn->amn_success++; 79 if (amn->amn_success >= amn->amn_success_threshold && 80 !is_max_rate(ni)) { 81 amn->amn_recovery = 1; 82 amn->amn_success = 0; 83 increase_rate(ni); 84 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG, 85 "AMRR increasing rate %d (txcnt=%d retrycnt=%d)\n", 86 ni->ni_rates.rs_rates[ni->ni_txrate] & 87 IEEE80211_RATE_VAL, 88 amn->amn_txcnt, amn->amn_retrycnt); 89 need_change = 1; 90 } else { 91 amn->amn_recovery = 0; 92 } 93 } else if (is_failure(amn)) { 94 amn->amn_success = 0; 95 if (!is_min_rate(ni)) { 96 if (amn->amn_recovery) { 97 amn->amn_success_threshold *= 2; 98 if (amn->amn_success_threshold > 99 amrr->amrr_max_success_threshold) 100 amn->amn_success_threshold = 101 amrr->amrr_max_success_threshold; 102 } else { 103 amn->amn_success_threshold = 104 amrr->amrr_min_success_threshold; 105 } 106 decrease_rate(ni); 107 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG, 108 "AMRR decreasing rate %d (txcnt=%d retrycnt=%d)\n", 109 ni->ni_rates.rs_rates[ni->ni_txrate] & 110 IEEE80211_RATE_VAL, 111 amn->amn_txcnt, amn->amn_retrycnt); 112 need_change = 1; 113 } 114 amn->amn_recovery = 0; 115 } 116 117 if (is_enough(amn) || need_change) 118 reset_cnt(amn); 119 } 120