509 lines
15 KiB
C
509 lines
15 KiB
C
/* $NetBSD: athrate-onoe.c,v 1.14 2009/03/27 16:10:50 dyoung Exp $ */
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/*-
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* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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* redistribution must be conditioned upon including a substantially
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* similar Disclaimer requirement for further binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <sys/cdefs.h>
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#ifdef __FreeBSD__
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__FBSDID("$FreeBSD: src/sys/dev/ath/ath_rate/onoe/onoe.c,v 1.10 2005/08/09 10:19:43 rwatson Exp $");
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#endif
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#ifdef __NetBSD__
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__KERNEL_RCSID(0, "$NetBSD: athrate-onoe.c,v 1.14 2009/03/27 16:10:50 dyoung Exp $");
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#endif
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/*
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* Atsushi Onoe's rate control algorithm.
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*/
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/kernel.h>
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#include <sys/errno.h>
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#include <sys/device.h>
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#include <sys/bus.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_media.h>
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#include <net/if_arp.h>
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#include <net/if_ether.h> /* XXX for ether_sprintf */
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#include <net80211/ieee80211_var.h>
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#include <net/bpf.h>
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#ifdef INET
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#include <netinet/in.h>
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#endif
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#include "ah_desc.h"
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#include <dev/ic/ath_netbsd.h>
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#include <dev/ic/athvar.h>
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#include <dev/ic/athrate-onoe.h>
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#include <external/isc/atheros_hal/dist/ah.h>
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#ifndef ONOE_DEBUG
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#define ONOE_DEBUG
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#endif
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#ifdef ONOE_DEBUG
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enum {
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ATH_DEBUG_RATE = 0x00000010, /* rate control */
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};
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#define DPRINTF(sc, _fmt, ...) do { \
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if (sc->sc_debug & ATH_DEBUG_RATE) \
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printf(_fmt, __VA_ARGS__); \
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} while (0)
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#else
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#define DPRINTF(sc, _fmt, ...)
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#endif
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/*
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* Default parameters for the rate control algorithm. These are
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* all tunable with sysctls. The rate controller runs periodically
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* (each ath_rateinterval ms) analyzing transmit statistics for each
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* neighbor/station (when operating in station mode this is only the AP).
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* If transmits look to be working well over a sampling period then
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* it gives a "raise rate credit". If transmits look to not be working
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* well than it deducts a credit. If the credits cross a threshold then
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* the transmit rate is raised. Various error conditions force the
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* the transmit rate to be dropped.
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*
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* The decision to issue/deduct a credit is based on the errors and
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* retries accumulated over the sampling period. ath_rate_raise defines
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* the percent of retransmits for which a credit is issued/deducted.
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* ath_rate_raise_threshold defines the threshold on credits at which
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* the transmit rate is increased.
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*
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* XXX this algorithm is flawed.
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*/
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static int ath_rateinterval = 1000; /* rate ctl interval (ms) */
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static int ath_rate_raise = 10; /* add credit threshold */
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static int ath_rate_raise_threshold = 10; /* rate ctl raise threshold */
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static void ath_ratectl(void *);
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static void ath_rate_update(struct ath_softc *, struct ieee80211_node *,
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int rate);
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static void ath_rate_ctl_start(struct ath_softc *, struct ieee80211_node *);
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static void ath_rate_ctl(void *, struct ieee80211_node *);
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void
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ath_rate_node_init(struct ath_softc *sc, struct ath_node *an)
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{
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/* NB: assumed to be zero'd by caller */
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ath_rate_update(sc, &an->an_node, 0);
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}
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void
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ath_rate_node_cleanup(struct ath_softc *sc, struct ath_node *an)
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{
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}
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void
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ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
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int shortPreamble, size_t frameLen,
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u_int8_t *rix, int *try0, u_int8_t *txrate)
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{
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struct onoe_node *on = ATH_NODE_ONOE(an);
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*rix = on->on_tx_rix0;
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*try0 = on->on_tx_try0;
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if (shortPreamble)
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*txrate = on->on_tx_rate0sp;
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else
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*txrate = on->on_tx_rate0;
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}
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void
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ath_rate_setupxtxdesc(struct ath_softc *sc, struct ath_node *an,
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struct ath_desc *ds, int shortPreamble, u_int8_t rix)
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{
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struct onoe_node *on = ATH_NODE_ONOE(an);
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ath_hal_setupxtxdesc(sc->sc_ah, ds
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, on->on_tx_rate1sp, 2 /* series 1 */
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, on->on_tx_rate2sp, 2 /* series 2 */
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, on->on_tx_rate3sp, 2 /* series 3 */
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);
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}
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void
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ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an,
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const struct ath_desc *ds, const struct ath_desc *ds0)
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{
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struct onoe_node *on = ATH_NODE_ONOE(an);
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if (ds->ds_txstat.ts_status == 0)
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on->on_tx_ok++;
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else
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on->on_tx_err++;
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on->on_tx_retr += ds->ds_txstat.ts_shortretry
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+ ds->ds_txstat.ts_longretry;
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}
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void
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ath_rate_newassoc(struct ath_softc *sc, struct ath_node *an, int isnew)
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{
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if (isnew)
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ath_rate_ctl_start(sc, &an->an_node);
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}
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static void
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ath_rate_update(struct ath_softc *sc, struct ieee80211_node *ni, int rate)
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{
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struct ath_node *an = ATH_NODE(ni);
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struct onoe_node *on = ATH_NODE_ONOE(an);
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const HAL_RATE_TABLE *rt = sc->sc_currates;
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u_int8_t rix;
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KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
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DPRINTF(sc, "%s: set xmit rate for %s to %dM\n",
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__func__, ether_sprintf(ni->ni_macaddr),
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ni->ni_rates.rs_nrates > 0 ?
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(ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL) / 2 : 0);
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ni->ni_txrate = rate;
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/*
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* Before associating a node has no rate set setup
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* so we can't calculate any transmit codes to use.
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* This is ok since we should never be sending anything
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* but management frames and those always go at the
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* lowest hardware rate.
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*/
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if (ni->ni_rates.rs_nrates == 0)
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goto done;
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on->on_tx_rix0 = sc->sc_rixmap[
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ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL];
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on->on_tx_rate0 = rt->info[on->on_tx_rix0].rateCode;
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on->on_tx_rate0sp = on->on_tx_rate0 |
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rt->info[on->on_tx_rix0].shortPreamble;
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if (sc->sc_mrretry) {
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/*
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* Hardware supports multi-rate retry; setup two
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* step-down retry rates and make the lowest rate
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* be the ``last chance''. We use 4, 2, 2, 2 tries
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* respectively (4 is set here, the rest are fixed
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* in the xmit routine).
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*/
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on->on_tx_try0 = 1 + 3; /* 4 tries at rate 0 */
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if (--rate >= 0) {
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rix = sc->sc_rixmap[
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ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL];
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on->on_tx_rate1 = rt->info[rix].rateCode;
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on->on_tx_rate1sp = on->on_tx_rate1 |
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rt->info[rix].shortPreamble;
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} else {
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on->on_tx_rate1 = on->on_tx_rate1sp = 0;
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}
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if (--rate >= 0) {
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rix = sc->sc_rixmap[
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ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL];
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on->on_tx_rate2 = rt->info[rix].rateCode;
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on->on_tx_rate2sp = on->on_tx_rate2 |
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rt->info[rix].shortPreamble;
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} else {
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on->on_tx_rate2 = on->on_tx_rate2sp = 0;
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}
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if (rate > 0) {
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/* NB: only do this if we didn't already do it above */
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on->on_tx_rate3 = rt->info[0].rateCode;
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on->on_tx_rate3sp =
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on->on_tx_rate3 | rt->info[0].shortPreamble;
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} else {
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on->on_tx_rate3 = on->on_tx_rate3sp = 0;
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}
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} else {
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on->on_tx_try0 = ATH_TXMAXTRY; /* max tries at rate 0 */
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on->on_tx_rate1 = on->on_tx_rate1sp = 0;
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on->on_tx_rate2 = on->on_tx_rate2sp = 0;
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on->on_tx_rate3 = on->on_tx_rate3sp = 0;
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}
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done:
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on->on_tx_ok = on->on_tx_err = on->on_tx_retr = on->on_tx_upper = 0;
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}
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/*
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* Set the starting transmit rate for a node.
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*/
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static void
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ath_rate_ctl_start(struct ath_softc *sc, struct ieee80211_node *ni)
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{
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#define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL)
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struct ieee80211com *ic = &sc->sc_ic;
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int srate;
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KASSERT(ni->ni_rates.rs_nrates > 0, ("no rates"));
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if (ic->ic_fixed_rate == IEEE80211_FIXED_RATE_NONE) {
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/*
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* No fixed rate is requested. For 11b start with
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* the highest negotiated rate; otherwise, for 11g
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* and 11a, we start "in the middle" at 24Mb or 36Mb.
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*/
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srate = ni->ni_rates.rs_nrates - 1;
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if (sc->sc_curmode != IEEE80211_MODE_11B) {
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/*
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* Scan the negotiated rate set to find the
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* closest rate.
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*/
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/* NB: the rate set is assumed sorted */
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for (; srate >= 0 && RATE(srate) > 72; srate--)
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;
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KASSERT(srate >= 0, ("bogus rate set"));
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}
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} else {
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/*
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* A fixed rate is to be used; ic_fixed_rate is an
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* index into the supported rate set. Convert this
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* to the index into the negotiated rate set for
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* the node. We know the rate is there because the
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* rate set is checked when the station associates.
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*/
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const struct ieee80211_rateset *rs =
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&ic->ic_sup_rates[ic->ic_curmode];
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int r = rs->rs_rates[ic->ic_fixed_rate] & IEEE80211_RATE_VAL;
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/* NB: the rate set is assumed sorted */
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srate = ni->ni_rates.rs_nrates - 1;
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for (; srate >= 0 && RATE(srate) != r; srate--)
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;
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KASSERT(srate >= 0,
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("fixed rate %d not in rate set", ic->ic_fixed_rate));
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}
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ath_rate_update(sc, ni, srate);
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#undef RATE
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}
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static void
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ath_rate_cb(void *arg, struct ieee80211_node *ni)
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{
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struct ath_softc *sc = arg;
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ath_rate_update(sc, ni, 0);
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}
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/*
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* Reset the rate control state for each 802.11 state transition.
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*/
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void
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ath_rate_newstate(struct ath_softc *sc, enum ieee80211_state state)
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{
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struct onoe_softc *osc = (struct onoe_softc *) sc->sc_rc;
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struct ieee80211com *ic = &sc->sc_ic;
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struct ieee80211_node *ni;
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if (state == IEEE80211_S_INIT) {
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callout_stop(&osc->timer);
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return;
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}
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if (ic->ic_opmode == IEEE80211_M_STA) {
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/*
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* Reset local xmit state; this is really only
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* meaningful when operating in station mode.
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*/
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ni = ic->ic_bss;
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if (state == IEEE80211_S_RUN) {
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ath_rate_ctl_start(sc, ni);
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} else {
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ath_rate_update(sc, ni, 0);
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}
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} else {
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/*
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* When operating as a station the node table holds
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* the AP's that were discovered during scanning.
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* For any other operating mode we want to reset the
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* tx rate state of each node.
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*/
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ieee80211_iterate_nodes(&ic->ic_sta, ath_rate_cb, sc);
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ath_rate_update(sc, ic->ic_bss, 0);
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}
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if (ic->ic_fixed_rate == IEEE80211_FIXED_RATE_NONE &&
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state == IEEE80211_S_RUN) {
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int interval;
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/*
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* Start the background rate control thread if we
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* are not configured to use a fixed xmit rate.
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*/
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interval = ath_rateinterval;
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if (ic->ic_opmode == IEEE80211_M_STA)
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interval /= 2;
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callout_reset(&osc->timer, (interval * hz) / 1000,
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ath_ratectl, &sc->sc_if);
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}
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}
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/*
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* Examine and potentially adjust the transmit rate.
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*/
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static void
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ath_rate_ctl(void *arg, struct ieee80211_node *ni)
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{
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struct ath_softc *sc = arg;
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struct onoe_node *on = ATH_NODE_ONOE(ATH_NODE(ni));
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struct ieee80211_rateset *rs = &ni->ni_rates;
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int dir = 0, nrate, enough;
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/*
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* Rate control
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* XXX: very primitive version.
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*/
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enough = (on->on_tx_ok + on->on_tx_err >= 10);
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/* no packet reached -> down */
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if (on->on_tx_err > 0 && on->on_tx_ok == 0)
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dir = -1;
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/* all packets needs retry in average -> down */
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if (enough && on->on_tx_ok < on->on_tx_retr)
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dir = -1;
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/* no error and less than rate_raise% of packets need retry -> up */
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if (enough && on->on_tx_err == 0 &&
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on->on_tx_retr < (on->on_tx_ok * ath_rate_raise) / 100)
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dir = 1;
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DPRINTF(sc, "%s: ok %d err %d retr %d upper %d dir %d\n",
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ether_sprintf(ni->ni_macaddr),
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on->on_tx_ok, on->on_tx_err, on->on_tx_retr,
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on->on_tx_upper, dir);
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nrate = ni->ni_txrate;
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switch (dir) {
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case 0:
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if (enough && on->on_tx_upper > 0)
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on->on_tx_upper--;
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break;
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case -1:
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if (nrate > 0) {
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nrate--;
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sc->sc_stats.ast_rate_drop++;
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}
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on->on_tx_upper = 0;
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break;
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case 1:
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/* raise rate if we hit rate_raise_threshold */
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if (++on->on_tx_upper < ath_rate_raise_threshold)
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break;
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on->on_tx_upper = 0;
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if (nrate + 1 < rs->rs_nrates) {
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nrate++;
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sc->sc_stats.ast_rate_raise++;
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}
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break;
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}
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if (nrate != ni->ni_txrate) {
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DPRINTF(sc, "%s: %dM -> %dM (%d ok, %d err, %d retr)\n",
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__func__,
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(rs->rs_rates[ni->ni_txrate] & IEEE80211_RATE_VAL) / 2,
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(rs->rs_rates[nrate] & IEEE80211_RATE_VAL) / 2,
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on->on_tx_ok, on->on_tx_err, on->on_tx_retr);
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ath_rate_update(sc, ni, nrate);
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} else if (enough)
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on->on_tx_ok = on->on_tx_err = on->on_tx_retr = 0;
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}
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static void
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ath_ratectl(void *arg)
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{
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struct ifnet *ifp = arg;
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struct ath_softc *sc = ifp->if_softc;
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struct onoe_softc *osc = (struct onoe_softc *) sc->sc_rc;
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struct ieee80211com *ic = &sc->sc_ic;
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int interval;
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if (ifp->if_flags & IFF_RUNNING) {
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sc->sc_stats.ast_rate_calls++;
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if (ic->ic_opmode == IEEE80211_M_STA)
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ath_rate_ctl(sc, ic->ic_bss); /* NB: no reference */
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else
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ieee80211_iterate_nodes(&ic->ic_sta, ath_rate_ctl, sc);
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}
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interval = ath_rateinterval;
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if (ic->ic_opmode == IEEE80211_M_STA)
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interval /= 2;
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callout_reset(&osc->timer, (interval * hz) / 1000,
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ath_ratectl, &sc->sc_if);
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}
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static void
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ath_rate_sysctlattach(struct ath_softc *sc)
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{
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struct sysctllog **clog = &sc->sc_sysctllog;
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const struct sysctlnode *cnode, *rnode;
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if ((rnode = ath_sysctl_treetop(NULL)) == NULL)
|
|
return;
|
|
|
|
SYSCTL_GLOBAL_INT(CTLFLAG_READWRITE, "rate_interval",
|
|
"rate control: operation interval (ms)", rateinterval);
|
|
/* XXX bounds check values */
|
|
SYSCTL_GLOBAL_INT(CTLFLAG_READWRITE, "rate_raise",
|
|
"rate control: retry threshold to credit rate raise (%%)",
|
|
rate_raise);
|
|
SYSCTL_GLOBAL_INT(CTLFLAG_READWRITE, "rate_raise_threshold",
|
|
"rate control: # good periods before raising rate",
|
|
rate_raise_threshold);
|
|
}
|
|
|
|
struct ath_ratectrl *
|
|
ath_rate_attach(struct ath_softc *sc)
|
|
{
|
|
struct onoe_softc *osc;
|
|
|
|
osc = malloc(sizeof(struct onoe_softc), M_DEVBUF, M_NOWAIT|M_ZERO);
|
|
if (osc == NULL)
|
|
return NULL;
|
|
osc->arc.arc_space = sizeof(struct onoe_node);
|
|
callout_init(&osc->timer, 0);
|
|
ath_rate_sysctlattach(sc);
|
|
|
|
return &osc->arc;
|
|
}
|
|
|
|
void
|
|
ath_rate_detach(struct ath_ratectrl *arc)
|
|
{
|
|
struct onoe_softc *osc = (struct onoe_softc *) arc;
|
|
|
|
callout_stop(&osc->timer);
|
|
free(osc, M_DEVBUF);
|
|
}
|