| 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 | |