3569e353ca
Note this includes changes to all drivers and moves some device firmware loading to use firmware(9) and a separate module (e.g. ral). Also there no longer are separate wlan_scan* modules; this functionality is now bundled into the wlan module. Supported by: Hobnob and Marvell Reviewed by: many Obtained from: Atheros (some bits)
227 lines
6.1 KiB
C
227 lines
6.1 KiB
C
/* $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>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*-
|
|
* Naive implementation of the Adaptive Multi Rate Retry algorithm:
|
|
*
|
|
* "IEEE 802.11 Rate Adaptation: A Practical Approach"
|
|
* Mathieu Lacage, Hossein Manshaei, Thierry Turletti
|
|
* INRIA Sophia - Projet Planete
|
|
* http://www-sop.inria.fr/rapports/sophia/RR-5208.html
|
|
*/
|
|
#include "opt_wlan.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.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_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)
|
|
|
|
static void amrr_sysctlattach(struct ieee80211_amrr *amrr,
|
|
struct sysctl_ctx_list *ctx, struct sysctl_oid *tree);
|
|
|
|
/* number of references from net80211 layer */
|
|
static int nrefs = 0;
|
|
|
|
void
|
|
ieee80211_amrr_setinterval(struct ieee80211_amrr *amrr, int msecs)
|
|
{
|
|
int t;
|
|
|
|
if (msecs < 100)
|
|
msecs = 100;
|
|
t = msecs_to_ticks(msecs);
|
|
amrr->amrr_interval = (t < 1) ? 1 : t;
|
|
}
|
|
|
|
void
|
|
ieee80211_amrr_init(struct ieee80211_amrr *amrr,
|
|
struct ieee80211vap *vap, int amin, int amax, int interval)
|
|
{
|
|
/* XXX bounds check? */
|
|
amrr->amrr_min_success_threshold = amin;
|
|
amrr->amrr_max_success_threshold = amax;
|
|
ieee80211_amrr_setinterval(amrr, interval);
|
|
|
|
amrr_sysctlattach(amrr, vap->iv_sysctl, vap->iv_oid);
|
|
}
|
|
|
|
void
|
|
ieee80211_amrr_cleanup(struct ieee80211_amrr *amrr)
|
|
{
|
|
}
|
|
|
|
void
|
|
ieee80211_amrr_node_init(struct ieee80211_amrr *amrr,
|
|
struct ieee80211_amrr_node *amn, struct ieee80211_node *ni)
|
|
{
|
|
const struct ieee80211_rateset *rs = &ni->ni_rates;
|
|
|
|
amn->amn_amrr = amrr;
|
|
amn->amn_success = 0;
|
|
amn->amn_recovery = 0;
|
|
amn->amn_txcnt = amn->amn_retrycnt = 0;
|
|
amn->amn_success_threshold = amrr->amrr_min_success_threshold;
|
|
|
|
/* pick initial rate */
|
|
for (amn->amn_rix = rs->rs_nrates - 1;
|
|
amn->amn_rix > 0 && (rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL) > 72;
|
|
amn->amn_rix--)
|
|
;
|
|
ni->ni_txrate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
|
|
amn->amn_ticks = ticks;
|
|
|
|
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
|
|
"AMRR initial rate %d", ni->ni_txrate);
|
|
}
|
|
|
|
static int
|
|
amrr_update(struct ieee80211_amrr *amrr, struct ieee80211_amrr_node *amn,
|
|
struct ieee80211_node *ni)
|
|
{
|
|
int rix = amn->amn_rix;
|
|
|
|
KASSERT(is_enough(amn), ("txcnt %d", amn->amn_txcnt));
|
|
|
|
if (is_success(amn)) {
|
|
amn->amn_success++;
|
|
if (amn->amn_success >= amn->amn_success_threshold &&
|
|
rix + 1 < ni->ni_rates.rs_nrates) {
|
|
amn->amn_recovery = 1;
|
|
amn->amn_success = 0;
|
|
rix++;
|
|
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
|
|
"AMRR increasing rate %d (txcnt=%d retrycnt=%d)",
|
|
ni->ni_rates.rs_rates[rix] & IEEE80211_RATE_VAL,
|
|
amn->amn_txcnt, amn->amn_retrycnt);
|
|
} else {
|
|
amn->amn_recovery = 0;
|
|
}
|
|
} else if (is_failure(amn)) {
|
|
amn->amn_success = 0;
|
|
if (rix > 0) {
|
|
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;
|
|
}
|
|
rix--;
|
|
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
|
|
"AMRR decreasing rate %d (txcnt=%d retrycnt=%d)",
|
|
ni->ni_rates.rs_rates[rix] & IEEE80211_RATE_VAL,
|
|
amn->amn_txcnt, amn->amn_retrycnt);
|
|
}
|
|
amn->amn_recovery = 0;
|
|
}
|
|
|
|
/* reset counters */
|
|
amn->amn_txcnt = 0;
|
|
amn->amn_retrycnt = 0;
|
|
|
|
return rix;
|
|
}
|
|
|
|
/*
|
|
* Return the rate index to use in sending a data frame.
|
|
* Update our internal state if it's been long enough.
|
|
* If the rate changes we also update ni_txrate to match.
|
|
*/
|
|
int
|
|
ieee80211_amrr_choose(struct ieee80211_node *ni,
|
|
struct ieee80211_amrr_node *amn)
|
|
{
|
|
struct ieee80211_amrr *amrr = amn->amn_amrr;
|
|
int rix;
|
|
|
|
if (is_enough(amn) && (ticks - amn->amn_ticks) > amrr->amrr_interval) {
|
|
rix = amrr_update(amrr, amn, ni);
|
|
if (rix != amn->amn_rix) {
|
|
/* update public rate */
|
|
ni->ni_txrate =
|
|
ni->ni_rates.rs_rates[rix] & IEEE80211_RATE_VAL;
|
|
amn->amn_rix = rix;
|
|
}
|
|
amn->amn_ticks = ticks;
|
|
} else
|
|
rix = amn->amn_rix;
|
|
return rix;
|
|
}
|
|
|
|
static int
|
|
amrr_sysctl_interval(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct ieee80211_amrr *amrr = arg1;
|
|
int msecs = ticks_to_msecs(amrr->amrr_interval);
|
|
int error;
|
|
|
|
error = sysctl_handle_int(oidp, &msecs, 0, req);
|
|
if (error || !req->newptr)
|
|
return error;
|
|
ieee80211_amrr_setinterval(amrr, msecs);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
amrr_sysctlattach(struct ieee80211_amrr *amrr,
|
|
struct sysctl_ctx_list *ctx, struct sysctl_oid *tree)
|
|
{
|
|
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"amrr_rate_interval", CTLTYPE_INT | CTLFLAG_RW, amrr,
|
|
0, amrr_sysctl_interval, "I", "amrr operation interval (ms)");
|
|
/* XXX bounds check values */
|
|
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"amrr_max_sucess_threshold", CTLFLAG_RW,
|
|
&amrr->amrr_max_success_threshold, 0, "");
|
|
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"amrr_min_sucess_threshold", CTLFLAG_RW,
|
|
&amrr->amrr_min_success_threshold, 0, "");
|
|
}
|
|
|
|
/*
|
|
* Module glue.
|
|
*/
|
|
IEEE80211_RATE_MODULE(amrr, 1);
|