Annotation of sys/net80211/ieee80211_amrr.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: ieee80211_amrr.c,v 1.3 2007/06/16 13:17:05 damien Exp $ */
! 2:
! 3: /*-
! 4: * Copyright (c) 2006
! 5: * Damien Bergamini <damien.bergamini@free.fr>
! 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: #include <sys/param.h>
! 21: #include <sys/kernel.h>
! 22: #include <sys/socket.h>
! 23: #include <sys/sysctl.h>
! 24:
! 25: #include <net/if.h>
! 26: #include <net/if_media.h>
! 27:
! 28: #ifdef INET
! 29: #include <netinet/in.h>
! 30: #include <netinet/if_ether.h>
! 31: #endif
! 32:
! 33: #include <net80211/ieee80211_var.h>
! 34: #include <net80211/ieee80211_amrr.h>
! 35:
! 36: #define is_success(amn) \
! 37: ((amn)->amn_retrycnt < (amn)->amn_txcnt / 10)
! 38: #define is_failure(amn) \
! 39: ((amn)->amn_retrycnt > (amn)->amn_txcnt / 3)
! 40: #define is_enough(amn) \
! 41: ((amn)->amn_txcnt > 10)
! 42: #define is_min_rate(ni) \
! 43: ((ni)->ni_txrate == 0)
! 44: #define is_max_rate(ni) \
! 45: ((ni)->ni_txrate == (ni)->ni_rates.rs_nrates - 1)
! 46: #define increase_rate(ni) \
! 47: ((ni)->ni_txrate++)
! 48: #define decrease_rate(ni) \
! 49: ((ni)->ni_txrate--)
! 50: #define reset_cnt(amn) \
! 51: do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0)
! 52:
! 53: void
! 54: ieee80211_amrr_node_init(const struct ieee80211_amrr *amrr,
! 55: struct ieee80211_amrr_node *amn)
! 56: {
! 57: amn->amn_success = 0;
! 58: amn->amn_recovery = 0;
! 59: amn->amn_txcnt = amn->amn_retrycnt = 0;
! 60: amn->amn_success_threshold = amrr->amrr_min_success_threshold;
! 61: }
! 62:
! 63: /*
! 64: * Update ni->ni_txrate.
! 65: */
! 66: void
! 67: ieee80211_amrr_choose(struct ieee80211_amrr *amrr, struct ieee80211_node *ni,
! 68: struct ieee80211_amrr_node *amn)
! 69: {
! 70: int need_change = 0;
! 71:
! 72: if (is_success(amn) && is_enough(amn)) {
! 73: amn->amn_success++;
! 74: if (amn->amn_success >= amn->amn_success_threshold &&
! 75: !is_max_rate(ni)) {
! 76: amn->amn_recovery = 1;
! 77: amn->amn_success = 0;
! 78: increase_rate(ni);
! 79: IEEE80211_DPRINTF(("AMRR increasing rate %d (txcnt=%d "
! 80: "retrycnt=%d)\n",
! 81: ni->ni_rates.rs_rates[ni->ni_txrate] &
! 82: IEEE80211_RATE_VAL,
! 83: amn->amn_txcnt, amn->amn_retrycnt));
! 84: need_change = 1;
! 85: } else {
! 86: amn->amn_recovery = 0;
! 87: }
! 88: } else if (is_failure(amn)) {
! 89: amn->amn_success = 0;
! 90: if (!is_min_rate(ni)) {
! 91: if (amn->amn_recovery) {
! 92: amn->amn_success_threshold *= 2;
! 93: if (amn->amn_success_threshold >
! 94: amrr->amrr_max_success_threshold)
! 95: amn->amn_success_threshold =
! 96: amrr->amrr_max_success_threshold;
! 97: } else {
! 98: amn->amn_success_threshold =
! 99: amrr->amrr_min_success_threshold;
! 100: }
! 101: decrease_rate(ni);
! 102: IEEE80211_DPRINTF(("AMRR decreasing rate %d (txcnt=%d "
! 103: "retrycnt=%d)\n",
! 104: ni->ni_rates.rs_rates[ni->ni_txrate] &
! 105: IEEE80211_RATE_VAL,
! 106: amn->amn_txcnt, amn->amn_retrycnt));
! 107: need_change = 1;
! 108: }
! 109: amn->amn_recovery = 0;
! 110: }
! 111:
! 112: if (is_enough(amn) || need_change)
! 113: reset_cnt(amn);
! 114: }
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