65f9edeee1
o no more ds_vdata in tx/rx descriptors o split h/w tx/rx descriptor from s/w status o as part of the descriptor split change the rate control module api so the ath_buf is passed in to the module so it can fetch both descriptor and status information as needed o add some const poisoning Also for sample rate control algorithm: o split debug msgs (node, rate, any) o uniformly bounds check rate indices (and in some cases correct checks) o move array index ops to after bounds checking o use final tsi from the status block instead of the h/w descriptor o replace h/w descriptor struct's with proper mask+shift defs (this doesn't belong here; everything is known by the driver and should just be sent down so there's no h/w-specific knowledge) MFC after: 1 month
547 lines
15 KiB
C
547 lines
15 KiB
C
/*-
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* Copyright (c) 2004 INRIA
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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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* AMRR rate control. See:
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* http://www-sop.inria.fr/rapports/sophia/RR-5208.html
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* "IEEE 802.11 Rate Adaptation: A Practical Approach" by
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* Mathieu Lacage, Hossein Manshaei, Thierry Turletti
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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/module.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/errno.h>
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#include <machine/bus.h>
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#include <machine/resource.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/ethernet.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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#include <netinet/if_ether.h>
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#endif
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#include <dev/ath/if_athvar.h>
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#include <dev/ath/ath_rate/amrr/amrr.h>
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#include <contrib/dev/ath/ah_desc.h>
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#define AMRR_DEBUG
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#ifdef AMRR_DEBUG
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#define DPRINTF(sc, _fmt, ...) do { \
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if (sc->sc_debug & 0x10) \
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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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static int ath_rateinterval = 1000; /* rate ctl interval (ms) */
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static int ath_rate_max_success_threshold = 10;
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static int ath_rate_min_success_threshold = 1;
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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 amrr_node *amn = ATH_NODE_AMRR(an);
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*rix = amn->amn_tx_rix0;
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*try0 = amn->amn_tx_try0;
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if (shortPreamble)
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*txrate = amn->amn_tx_rate0sp;
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else
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*txrate = amn->amn_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 amrr_node *amn = ATH_NODE_AMRR(an);
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ath_hal_setupxtxdesc(sc->sc_ah, ds
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, amn->amn_tx_rate1sp, amn->amn_tx_try1 /* series 1 */
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, amn->amn_tx_rate2sp, amn->amn_tx_try2 /* series 2 */
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, amn->amn_tx_rate3sp, amn->amn_tx_try3 /* 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_buf *bf)
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{
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struct amrr_node *amn = ATH_NODE_AMRR(an);
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const struct ath_tx_status *ts = &bf->bf_status.ds_txstat;
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int sr = ts->ts_shortretry;
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int lr = ts->ts_longretry;
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int retry_count = sr + lr;
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amn->amn_tx_try0_cnt++;
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if (retry_count == 1) {
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amn->amn_tx_try1_cnt++;
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} else if (retry_count == 2) {
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amn->amn_tx_try1_cnt++;
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amn->amn_tx_try2_cnt++;
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} else if (retry_count == 3) {
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amn->amn_tx_try1_cnt++;
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amn->amn_tx_try2_cnt++;
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amn->amn_tx_try3_cnt++;
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} else if (retry_count > 3) {
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amn->amn_tx_try1_cnt++;
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amn->amn_tx_try2_cnt++;
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amn->amn_tx_try3_cnt++;
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amn->amn_tx_failure_cnt++;
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}
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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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node_reset (struct amrr_node *amn)
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{
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amn->amn_tx_try0_cnt = 0;
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amn->amn_tx_try1_cnt = 0;
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amn->amn_tx_try2_cnt = 0;
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amn->amn_tx_try3_cnt = 0;
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amn->amn_tx_failure_cnt = 0;
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amn->amn_success = 0;
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amn->amn_recovery = 0;
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amn->amn_success_threshold = ath_rate_min_success_threshold;
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}
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/**
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* The code below assumes that we are dealing with hardware multi rate retry
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* I have no idea what will happen if you try to use this module with another
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* type of hardware. Your machine might catch fire or it might work with
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* horrible performance...
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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 amrr_node *amn = ATH_NODE_AMRR(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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amn->amn_tx_rix0 = sc->sc_rixmap[
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ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL];
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amn->amn_tx_rate0 = rt->info[amn->amn_tx_rix0].rateCode;
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amn->amn_tx_rate0sp = amn->amn_tx_rate0 |
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rt->info[amn->amn_tx_rix0].shortPreamble;
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if (sc->sc_mrretry) {
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amn->amn_tx_try0 = 1;
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amn->amn_tx_try1 = 1;
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amn->amn_tx_try2 = 1;
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amn->amn_tx_try3 = 1;
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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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amn->amn_tx_rate1 = rt->info[rix].rateCode;
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amn->amn_tx_rate1sp = amn->amn_tx_rate1 |
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rt->info[rix].shortPreamble;
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} else {
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amn->amn_tx_rate1 = amn->amn_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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amn->amn_tx_rate2 = rt->info[rix].rateCode;
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amn->amn_tx_rate2sp = amn->amn_tx_rate2 |
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rt->info[rix].shortPreamble;
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} else {
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amn->amn_tx_rate2 = amn->amn_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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amn->amn_tx_rate3 = rt->info[0].rateCode;
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amn->amn_tx_rate3sp =
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amn->amn_tx_rate3 | rt->info[0].shortPreamble;
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} else {
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amn->amn_tx_rate3 = amn->amn_tx_rate3sp = 0;
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}
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} else {
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amn->amn_tx_try0 = ATH_TXMAXTRY;
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/* theorically, these statements are useless because
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* the code which uses them tests for an_tx_try0 == ATH_TXMAXTRY
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*/
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amn->amn_tx_try1 = 0;
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amn->amn_tx_try2 = 0;
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amn->amn_tx_try3 = 0;
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amn->amn_tx_rate1 = amn->amn_tx_rate1sp = 0;
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amn->amn_tx_rate2 = amn->amn_tx_rate2sp = 0;
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amn->amn_tx_rate3 = amn->amn_tx_rate3sp = 0;
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}
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}
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node_reset (amn);
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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 amrr_softc *asc = (struct amrr_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(&asc->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(&asc->timer, (interval * hz) / 1000,
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ath_ratectl, sc->sc_ifp);
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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 amrr_node *amn = ATH_NODE_AMRR(ATH_NODE (ni));
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int old_rate;
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#define is_success(amn) \
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(amn->amn_tx_try1_cnt < (amn->amn_tx_try0_cnt/10))
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#define is_enough(amn) \
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(amn->amn_tx_try0_cnt > 10)
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#define is_failure(amn) \
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(amn->amn_tx_try1_cnt > (amn->amn_tx_try0_cnt/3))
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#define is_max_rate(ni) \
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((ni->ni_txrate + 1) >= ni->ni_rates.rs_nrates)
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#define is_min_rate(ni) \
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(ni->ni_txrate == 0)
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old_rate = ni->ni_txrate;
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DPRINTF (sc, "cnt0: %d cnt1: %d cnt2: %d cnt3: %d -- threshold: %d\n",
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amn->amn_tx_try0_cnt,
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amn->amn_tx_try1_cnt,
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amn->amn_tx_try2_cnt,
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amn->amn_tx_try3_cnt,
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amn->amn_success_threshold);
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if (is_success (amn) && is_enough (amn)) {
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amn->amn_success++;
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if (amn->amn_success == amn->amn_success_threshold &&
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!is_max_rate (ni)) {
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amn->amn_recovery = 1;
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amn->amn_success = 0;
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ni->ni_txrate++;
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DPRINTF (sc, "increase rate to %d\n", ni->ni_txrate);
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} else {
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amn->amn_recovery = 0;
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}
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} else if (is_failure (amn)) {
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amn->amn_success = 0;
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if (!is_min_rate (ni)) {
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if (amn->amn_recovery) {
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/* recovery failure. */
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amn->amn_success_threshold *= 2;
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amn->amn_success_threshold = min (amn->amn_success_threshold,
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(u_int)ath_rate_max_success_threshold);
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DPRINTF (sc, "decrease rate recovery thr: %d\n", amn->amn_success_threshold);
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} else {
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/* simple failure. */
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amn->amn_success_threshold = ath_rate_min_success_threshold;
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DPRINTF (sc, "decrease rate normal thr: %d\n", amn->amn_success_threshold);
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}
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amn->amn_recovery = 0;
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ni->ni_txrate--;
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} else {
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amn->amn_recovery = 0;
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}
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}
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if (is_enough (amn) || old_rate != ni->ni_txrate) {
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/* reset counters. */
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amn->amn_tx_try0_cnt = 0;
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amn->amn_tx_try1_cnt = 0;
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amn->amn_tx_try2_cnt = 0;
|
|
amn->amn_tx_try3_cnt = 0;
|
|
amn->amn_tx_failure_cnt = 0;
|
|
}
|
|
if (old_rate != ni->ni_txrate) {
|
|
ath_rate_update(sc, ni, ni->ni_txrate);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ath_ratectl(void *arg)
|
|
{
|
|
struct ifnet *ifp = arg;
|
|
struct ath_softc *sc = ifp->if_softc;
|
|
struct amrr_softc *asc = (struct amrr_softc *) sc->sc_rc;
|
|
struct ieee80211com *ic = &sc->sc_ic;
|
|
int interval;
|
|
|
|
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
|
|
sc->sc_stats.ast_rate_calls++;
|
|
|
|
if (ic->ic_opmode == IEEE80211_M_STA)
|
|
ath_rate_ctl(sc, ic->ic_bss); /* NB: no reference */
|
|
else
|
|
ieee80211_iterate_nodes(&ic->ic_sta, ath_rate_ctl, sc);
|
|
}
|
|
interval = ath_rateinterval;
|
|
if (ic->ic_opmode == IEEE80211_M_STA)
|
|
interval /= 2;
|
|
callout_reset(&asc->timer, (interval * hz) / 1000,
|
|
ath_ratectl, sc->sc_ifp);
|
|
}
|
|
|
|
static void
|
|
ath_rate_sysctlattach(struct ath_softc *sc)
|
|
{
|
|
struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev);
|
|
struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev);
|
|
|
|
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"rate_interval", CTLFLAG_RW, &ath_rateinterval, 0,
|
|
"rate control: operation interval (ms)");
|
|
/* XXX bounds check values */
|
|
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"max_sucess_threshold", CTLFLAG_RW,
|
|
&ath_rate_max_success_threshold, 0, "");
|
|
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"min_sucess_threshold", CTLFLAG_RW,
|
|
&ath_rate_min_success_threshold, 0, "");
|
|
}
|
|
|
|
struct ath_ratectrl *
|
|
ath_rate_attach(struct ath_softc *sc)
|
|
{
|
|
struct amrr_softc *asc;
|
|
|
|
asc = malloc(sizeof(struct amrr_softc), M_DEVBUF, M_NOWAIT|M_ZERO);
|
|
if (asc == NULL)
|
|
return NULL;
|
|
asc->arc.arc_space = sizeof(struct amrr_node);
|
|
callout_init(&asc->timer, debug_mpsafenet ? CALLOUT_MPSAFE : 0);
|
|
ath_rate_sysctlattach(sc);
|
|
|
|
return &asc->arc;
|
|
}
|
|
|
|
void
|
|
ath_rate_detach(struct ath_ratectrl *arc)
|
|
{
|
|
struct amrr_softc *asc = (struct amrr_softc *) arc;
|
|
|
|
callout_drain(&asc->timer);
|
|
free(asc, M_DEVBUF);
|
|
}
|
|
|
|
/*
|
|
* Module glue.
|
|
*/
|
|
static int
|
|
amrr_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
if (bootverbose)
|
|
printf("ath_rate: <AMRR rate control algorithm> version 0.1\n");
|
|
return 0;
|
|
case MOD_UNLOAD:
|
|
return 0;
|
|
}
|
|
return EINVAL;
|
|
}
|
|
|
|
static moduledata_t amrr_mod = {
|
|
"ath_rate",
|
|
amrr_modevent,
|
|
0
|
|
};
|
|
DECLARE_MODULE(ath_rate, amrr_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
|
|
MODULE_VERSION(ath_rate, 1);
|
|
MODULE_DEPEND(ath_rate, wlan, 1, 1, 1);
|