120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/* $NetBSD: ieee80211_amrr.c,v 1.2 2007/12/11 12:40:10 lukem Exp $ */
|
|
/* $OpenBSD: ieee80211_amrr.c,v 1.1 2006/06/17 19:07:19 damien Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2006
|
|
* Damien Bergamini <damien.bergamini@free.fr>
|
|
*
|
|
* 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 <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: ieee80211_amrr.c,v 1.2 2007/12/11 12:40:10 lukem Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_media.h>
|
|
|
|
#ifdef INET
|
|
#include <netinet/in.h>
|
|
#include <netinet/if_ether.h>
|
|
#endif
|
|
|
|
#include <net80211/ieee80211.h>
|
|
#include <net80211/ieee80211_var.h>
|
|
#include <net80211/ieee80211_amrr.h>
|
|
|
|
#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 is_min_rate(ni) \
|
|
((ni)->ni_txrate == 0)
|
|
#define is_max_rate(ni) \
|
|
((ni)->ni_txrate == (ni)->ni_rates.rs_nrates - 1)
|
|
#define increase_rate(ni) \
|
|
((ni)->ni_txrate++)
|
|
#define decrease_rate(ni) \
|
|
((ni)->ni_txrate--)
|
|
#define reset_cnt(amn) \
|
|
do { (amn)->amn_txcnt = (amn)->amn_retrycnt = 0; } while (0)
|
|
|
|
void
|
|
ieee80211_amrr_node_init(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)
|
|
{
|
|
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);
|
|
IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG,
|
|
"AMRR increasing rate %d (txcnt=%d retrycnt=%d)\n",
|
|
ni->ni_rates.rs_rates[ni->ni_txrate] &
|
|
IEEE80211_RATE_VAL,
|
|
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);
|
|
IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_DEBUG,
|
|
"AMRR decreasing rate %d (txcnt=%d retrycnt=%d)\n",
|
|
ni->ni_rates.rs_rates[ni->ni_txrate] &
|
|
IEEE80211_RATE_VAL,
|
|
amn->amn_txcnt, amn->amn_retrycnt);
|
|
need_change = 1;
|
|
}
|
|
amn->amn_recovery = 0;
|
|
}
|
|
|
|
if (is_enough(amn) || need_change)
|
|
reset_cnt(amn);
|
|
}
|