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freebsd-nq/sys/dev/ath/if_ath.c
Sam Leffler 8cec0ab9a8 o track API change for HAL v0.9.6.1 
o fix race condition when processing rx descriptors: because we use
  a self-linked descriptor at the end of the rx descriptor list to
  avoid rx overruns (which can easily happen for 5212 parts that enable
  PHY errors) we must carefully check that a descriptor is "done" by
  looking ahead to the next descriptor before believing the done bit
  in the current descriptor (this is all handled in the HAL since the
  rx descriptor format is chip-specific so we need to pass in two
  additional parameters--the physical address of the current descriptor
  and the virtual address of the next descriptor in the list)
o check copyout return status for SIOCGATHSTATS ioctl

Approved by:	re (scottl)
2003-11-29 01:23:59 +00:00

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/*-
* Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
* redistribution must be conditioned upon including a substantially
* similar Disclaimer requirement for further binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGES.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Driver for the Atheros Wireless LAN controller.
*
* This software is derived from work of Atsushi Onoe; his contribution
* is greatly appreciated.
*/
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/callout.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <machine/bus.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_llc.h>
#include <net80211/ieee80211_var.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#define AR_DEBUG
#include <dev/ath/if_athvar.h>
#include <contrib/dev/ath/ah_desc.h>
/* unalligned little endian access */
#define LE_READ_2(p) \
((u_int16_t) \
((((u_int8_t *)(p))[0] ) | (((u_int8_t *)(p))[1] << 8)))
#define LE_READ_4(p) \
((u_int32_t) \
((((u_int8_t *)(p))[0] ) | (((u_int8_t *)(p))[1] << 8) | \
(((u_int8_t *)(p))[2] << 16) | (((u_int8_t *)(p))[3] << 24)))
static void ath_init(void *);
static void ath_stop(struct ifnet *);
static void ath_start(struct ifnet *);
static void ath_reset(struct ath_softc *);
static int ath_media_change(struct ifnet *);
static void ath_watchdog(struct ifnet *);
static int ath_ioctl(struct ifnet *, u_long, caddr_t);
static void ath_fatal_proc(void *, int);
static void ath_rxorn_proc(void *, int);
static void ath_bmiss_proc(void *, int);
static void ath_initkeytable(struct ath_softc *);
static void ath_mode_init(struct ath_softc *);
static int ath_beacon_alloc(struct ath_softc *, struct ieee80211_node *);
static void ath_beacon_proc(void *, int);
static void ath_beacon_free(struct ath_softc *);
static void ath_beacon_config(struct ath_softc *);
static int ath_desc_alloc(struct ath_softc *);
static void ath_desc_free(struct ath_softc *);
static struct ieee80211_node *ath_node_alloc(struct ieee80211com *);
static void ath_node_free(struct ieee80211com *, struct ieee80211_node *);
static void ath_node_copy(struct ieee80211com *,
struct ieee80211_node *, const struct ieee80211_node *);
static u_int8_t ath_node_getrssi(struct ieee80211com *,
struct ieee80211_node *);
static int ath_rxbuf_init(struct ath_softc *, struct ath_buf *);
static void ath_rx_proc(void *, int);
static int ath_tx_start(struct ath_softc *, struct ieee80211_node *,
struct ath_buf *, struct mbuf *);
static void ath_tx_proc(void *, int);
static int ath_chan_set(struct ath_softc *, struct ieee80211_channel *);
static void ath_draintxq(struct ath_softc *);
static void ath_stoprecv(struct ath_softc *);
static int ath_startrecv(struct ath_softc *);
static void ath_next_scan(void *);
static void ath_calibrate(void *);
static int ath_newstate(struct ieee80211com *, enum ieee80211_state, int);
static void ath_newassoc(struct ieee80211com *,
struct ieee80211_node *, int);
static int ath_getchannels(struct ath_softc *, u_int cc, HAL_BOOL outdoor);
static int ath_rate_setup(struct ath_softc *sc, u_int mode);
static void ath_setcurmode(struct ath_softc *, enum ieee80211_phymode);
static void ath_rate_ctl_reset(struct ath_softc *, enum ieee80211_state);
static void ath_rate_ctl(void *, struct ieee80211_node *);
SYSCTL_DECL(_hw_ath);
/* XXX validate sysctl values */
static int ath_dwelltime = 200; /* 5 channels/second */
SYSCTL_INT(_hw_ath, OID_AUTO, dwell, CTLFLAG_RW, &ath_dwelltime,
0, "channel dwell time (ms) for AP/station scanning");
static int ath_calinterval = 30; /* calibrate every 30 secs */
SYSCTL_INT(_hw_ath, OID_AUTO, calibrate, CTLFLAG_RW, &ath_calinterval,
0, "chip calibration interval (secs)");
static int ath_outdoor = AH_TRUE; /* outdoor operation */
SYSCTL_INT(_hw_ath, OID_AUTO, outdoor, CTLFLAG_RD, &ath_outdoor,
0, "enable/disable outdoor operation");
static int ath_countrycode = CTRY_DEFAULT; /* country code */
SYSCTL_INT(_hw_ath, OID_AUTO, countrycode, CTLFLAG_RD, &ath_countrycode,
0, "country code");
static int ath_regdomain = 0; /* regulatory domain */
SYSCTL_INT(_hw_ath, OID_AUTO, regdomain, CTLFLAG_RD, &ath_regdomain,
0, "regulatory domain");
#ifdef AR_DEBUG
int ath_debug = 0;
SYSCTL_INT(_hw_ath, OID_AUTO, debug, CTLFLAG_RW, &ath_debug,
0, "control debugging printfs");
#define IFF_DUMPPKTS(_ifp) \
(ath_debug || \
((_ifp)->if_flags & (IFF_DEBUG|IFF_LINK2)) == (IFF_DEBUG|IFF_LINK2))
static void ath_printrxbuf(struct ath_buf *bf, int);
static void ath_printtxbuf(struct ath_buf *bf, int);
#define DPRINTF(X) if (ath_debug) printf X
#define DPRINTF2(X) if (ath_debug > 1) printf X
#else
#define IFF_DUMPPKTS(_ifp) \
(((_ifp)->if_flags & (IFF_DEBUG|IFF_LINK2)) == (IFF_DEBUG|IFF_LINK2))
#define DPRINTF(X)
#define DPRINTF2(X)
#endif
int
ath_attach(u_int16_t devid, struct ath_softc *sc)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = &ic->ic_if;
struct ath_hal *ah;
HAL_STATUS status;
int error = 0;
DPRINTF(("ath_attach: devid 0x%x\n", devid));
/* set these up early for if_printf use */
if_initname(ifp, device_get_name(sc->sc_dev),
device_get_unit(sc->sc_dev));
ah = ath_hal_attach(devid, sc, sc->sc_st, sc->sc_sh, &status);
if (ah == NULL) {
if_printf(ifp, "unable to attach hardware; HAL status %u\n",
status);
error = ENXIO;
goto bad;
}
if (ah->ah_abi != HAL_ABI_VERSION) {
if_printf(ifp, "HAL ABI mismatch detected (0x%x != 0x%x)\n",
ah->ah_abi, HAL_ABI_VERSION);
error = ENXIO;
goto bad;
}
if_printf(ifp, "mac %d.%d phy %d.%d",
ah->ah_macVersion, ah->ah_macRev,
ah->ah_phyRev >> 4, ah->ah_phyRev & 0xf);
if (ah->ah_analog5GhzRev)
printf(" 5ghz radio %d.%d",
ah->ah_analog5GhzRev >> 4, ah->ah_analog5GhzRev & 0xf);
if (ah->ah_analog2GhzRev)
printf(" 2ghz radio %d.%d",
ah->ah_analog2GhzRev >> 4, ah->ah_analog2GhzRev & 0xf);
printf("\n");
sc->sc_ah = ah;
sc->sc_invalid = 0; /* ready to go, enable interrupt handling */
/*
* Collect the channel list using the default country
* code and including outdoor channels. The 802.11 layer
* is resposible for filtering this list based on settings
* like the phy mode.
*/
error = ath_getchannels(sc, ath_countrycode, ath_outdoor);
if (error != 0)
goto bad;
/*
* Copy these back; they are set as a side effect
* of constructing the channel list.
*/
ath_regdomain = ath_hal_getregdomain(ah);
ath_countrycode = ath_hal_getcountrycode(ah);
/*
* Setup rate tables for all potential media types.
*/
ath_rate_setup(sc, IEEE80211_MODE_11A);
ath_rate_setup(sc, IEEE80211_MODE_11B);
ath_rate_setup(sc, IEEE80211_MODE_11G);
ath_rate_setup(sc, IEEE80211_MODE_TURBO);
error = ath_desc_alloc(sc);
if (error != 0) {
if_printf(ifp, "failed to allocate descriptors: %d\n", error);
goto bad;
}
callout_init(&sc->sc_scan_ch, CALLOUT_MPSAFE);
callout_init(&sc->sc_cal_ch, CALLOUT_MPSAFE);
ATH_TXBUF_LOCK_INIT(sc);
ATH_TXQ_LOCK_INIT(sc);
TASK_INIT(&sc->sc_txtask, 0, ath_tx_proc, sc);
TASK_INIT(&sc->sc_rxtask, 0, ath_rx_proc, sc);
TASK_INIT(&sc->sc_swbatask, 0, ath_beacon_proc, sc);
TASK_INIT(&sc->sc_rxorntask, 0, ath_rxorn_proc, sc);
TASK_INIT(&sc->sc_fataltask, 0, ath_fatal_proc, sc);
TASK_INIT(&sc->sc_bmisstask, 0, ath_bmiss_proc, sc);
/*
* For now just pre-allocate one data queue and one
* beacon queue. Note that the HAL handles resetting
* them at the needed time. Eventually we'll want to
* allocate more tx queues for splitting management
* frames and for QOS support.
*/
sc->sc_txhalq = ath_hal_setuptxqueue(ah,
HAL_TX_QUEUE_DATA,
AH_TRUE /* enable interrupts */
);
if (sc->sc_txhalq == (u_int) -1) {
if_printf(ifp, "unable to setup a data xmit queue!\n");
goto bad;
}
sc->sc_bhalq = ath_hal_setuptxqueue(ah,
HAL_TX_QUEUE_BEACON,
AH_TRUE /* enable interrupts */
);
if (sc->sc_bhalq == (u_int) -1) {
if_printf(ifp, "unable to setup a beacon xmit queue!\n");
goto bad;
}
ifp->if_softc = sc;
ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
ifp->if_start = ath_start;
ifp->if_watchdog = ath_watchdog;
ifp->if_ioctl = ath_ioctl;
ifp->if_init = ath_init;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
ic->ic_softc = sc;
ic->ic_newassoc = ath_newassoc;
/* XXX not right but it's not used anywhere important */
ic->ic_phytype = IEEE80211_T_OFDM;
ic->ic_opmode = IEEE80211_M_STA;
ic->ic_caps = IEEE80211_C_WEP /* wep supported */
| IEEE80211_C_IBSS /* ibss, nee adhoc, mode */
| IEEE80211_C_HOSTAP /* hostap mode */
| IEEE80211_C_MONITOR /* monitor mode */
| IEEE80211_C_SHPREAMBLE /* short preamble supported */
| IEEE80211_C_RCVMGT; /* recv management frames */
/* get mac address from hardware */
ath_hal_getmac(ah, ic->ic_myaddr);
/* call MI attach routine. */
ieee80211_ifattach(ifp);
/* override default methods */
ic->ic_node_alloc = ath_node_alloc;
ic->ic_node_free = ath_node_free;
ic->ic_node_copy = ath_node_copy;
ic->ic_node_getrssi = ath_node_getrssi;
sc->sc_newstate = ic->ic_newstate;
ic->ic_newstate = ath_newstate;
/* complete initialization */
ieee80211_media_init(ifp, ath_media_change, ieee80211_media_status);
bpfattach2(ifp, DLT_IEEE802_11_RADIO,
sizeof(struct ieee80211_frame) + sizeof(sc->sc_tx_th),
&sc->sc_drvbpf);
/*
* Initialize constant fields.
*
* NB: the channel is setup each time we transition to the
* RUN state to avoid filling it in for each frame.
*/
sc->sc_tx_th.wt_ihdr.it_len = sizeof(sc->sc_tx_th);
sc->sc_tx_th.wt_ihdr.it_present = ATH_TX_RADIOTAP_PRESENT;
sc->sc_rx_th.wr_ihdr.it_len = sizeof(sc->sc_rx_th);
sc->sc_rx_th.wr_ihdr.it_present = ATH_RX_RADIOTAP_PRESENT;
if_printf(ifp, "802.11 address: %s\n", ether_sprintf(ic->ic_myaddr));
return 0;
bad:
if (ah)
ath_hal_detach(ah);
sc->sc_invalid = 1;
return error;
}
int
ath_detach(struct ath_softc *sc)
{
struct ifnet *ifp = &sc->sc_ic.ic_if;
DPRINTF(("ath_detach: if_flags %x\n", ifp->if_flags));
ath_stop(ifp);
bpfdetach(ifp);
ath_desc_free(sc);
ath_hal_detach(sc->sc_ah);
ieee80211_ifdetach(ifp);
ATH_TXBUF_LOCK_DESTROY(sc);
ATH_TXQ_LOCK_DESTROY(sc);
return 0;
}
void
ath_suspend(struct ath_softc *sc)
{
struct ifnet *ifp = &sc->sc_ic.ic_if;
DPRINTF(("ath_suspend: if_flags %x\n", ifp->if_flags));
ath_stop(ifp);
}
void
ath_resume(struct ath_softc *sc)
{
struct ifnet *ifp = &sc->sc_ic.ic_if;
DPRINTF(("ath_resume: if_flags %x\n", ifp->if_flags));
if (ifp->if_flags & IFF_UP) {
ath_init(ifp);
if (ifp->if_flags & IFF_RUNNING)
ath_start(ifp);
}
}
void
ath_shutdown(struct ath_softc *sc)
{
struct ifnet *ifp = &sc->sc_ic.ic_if;
DPRINTF(("ath_shutdown: if_flags %x\n", ifp->if_flags));
ath_stop(ifp);
}
void
ath_intr(void *arg)
{
struct ath_softc *sc = arg;
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = &ic->ic_if;
struct ath_hal *ah = sc->sc_ah;
HAL_INT status;
if (sc->sc_invalid) {
/*
* The hardware is not ready/present, don't touch anything.
* Note this can happen early on if the IRQ is shared.
*/
DPRINTF(("ath_intr: invalid; ignored\n"));
return;
}
if ((ifp->if_flags & (IFF_RUNNING|IFF_UP)) != (IFF_RUNNING|IFF_UP)) {
DPRINTF(("ath_intr: if_flags 0x%x\n", ifp->if_flags));
ath_hal_getisr(ah, &status); /* clear ISR */
ath_hal_intrset(ah, 0); /* disable further intr's */
return;
}
ath_hal_getisr(ah, &status); /* NB: clears ISR too */
DPRINTF2(("ath_intr: status 0x%x\n", status));
#ifdef AR_DEBUG
if (ath_debug &&
(status & (HAL_INT_FATAL|HAL_INT_RXORN|HAL_INT_BMISS))) {
if_printf(ifp, "ath_intr: status 0x%x\n", status);
ath_hal_dumpstate(ah);
}
#endif /* AR_DEBUG */
status &= sc->sc_imask; /* discard unasked for bits */
if (status & HAL_INT_FATAL) {
sc->sc_stats.ast_hardware++;
ath_hal_intrset(ah, 0); /* disable intr's until reset */
taskqueue_enqueue(taskqueue_swi, &sc->sc_fataltask);
} else if (status & HAL_INT_RXORN) {
sc->sc_stats.ast_rxorn++;
ath_hal_intrset(ah, 0); /* disable intr's until reset */
taskqueue_enqueue(taskqueue_swi, &sc->sc_rxorntask);
} else {
if (status & HAL_INT_RXEOL) {
/*
* NB: the hardware should re-read the link when
* RXE bit is written, but it doesn't work at
* least on older hardware revs.
*/
sc->sc_stats.ast_rxeol++;
sc->sc_rxlink = NULL;
}
if (status & HAL_INT_TXURN) {
sc->sc_stats.ast_txurn++;
/* bump tx trigger level */
ath_hal_updatetxtriglevel(ah, AH_TRUE);
}
if (status & HAL_INT_RX)
taskqueue_enqueue(taskqueue_swi, &sc->sc_rxtask);
if (status & HAL_INT_TX)
taskqueue_enqueue(taskqueue_swi, &sc->sc_txtask);
if (status & HAL_INT_SWBA)
taskqueue_enqueue(taskqueue_swi, &sc->sc_swbatask);
if (status & HAL_INT_BMISS) {
sc->sc_stats.ast_bmiss++;
taskqueue_enqueue(taskqueue_swi, &sc->sc_bmisstask);
}
}
}
static void
ath_fatal_proc(void *arg, int pending)
{
struct ath_softc *sc = arg;
device_printf(sc->sc_dev, "hardware error; resetting\n");
ath_reset(sc);
}
static void
ath_rxorn_proc(void *arg, int pending)
{
struct ath_softc *sc = arg;
device_printf(sc->sc_dev, "rx FIFO overrun; resetting\n");
ath_reset(sc);
}
static void
ath_bmiss_proc(void *arg, int pending)
{
struct ath_softc *sc = arg;
struct ieee80211com *ic = &sc->sc_ic;
DPRINTF(("ath_bmiss_proc: pending %u\n", pending));
KASSERT(ic->ic_opmode == IEEE80211_M_STA,
("unexpect operating mode %u", ic->ic_opmode));
if (ic->ic_state == IEEE80211_S_RUN) {
/*
* Rather than go directly to scan state, try to
* reassociate first. If that fails then the state
* machine will drop us into scanning after timing
* out waiting for a probe response.
*/
ieee80211_new_state(ic, IEEE80211_S_ASSOC, -1);
}
}
static u_int
ath_chan2flags(struct ieee80211com *ic, struct ieee80211_channel *chan)
{
static const u_int modeflags[] = {
0, /* IEEE80211_MODE_AUTO */
CHANNEL_A, /* IEEE80211_MODE_11A */
CHANNEL_B, /* IEEE80211_MODE_11B */
CHANNEL_PUREG, /* IEEE80211_MODE_11G */
CHANNEL_T /* IEEE80211_MODE_TURBO */
};
return modeflags[ieee80211_chan2mode(ic, chan)];
}
static void
ath_init(void *arg)
{
struct ath_softc *sc = (struct ath_softc *) arg;
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = &ic->ic_if;
struct ieee80211_node *ni;
enum ieee80211_phymode mode;
struct ath_hal *ah = sc->sc_ah;
HAL_STATUS status;
HAL_CHANNEL hchan;
DPRINTF(("ath_init: if_flags 0x%x\n", ifp->if_flags));
ATH_LOCK(sc);
/*
* Stop anything previously setup. This is safe
* whether this is the first time through or not.
*/
ath_stop(ifp);
/*
* The basic interface to setting the hardware in a good
* state is ``reset''. On return the hardware is known to
* be powered up and with interrupts disabled. This must
* be followed by initialization of the appropriate bits
* and then setup of the interrupt mask.
*/
hchan.channel = ic->ic_ibss_chan->ic_freq;
hchan.channelFlags = ath_chan2flags(ic, ic->ic_ibss_chan);
if (!ath_hal_reset(ah, ic->ic_opmode, &hchan, AH_FALSE, &status)) {
if_printf(ifp, "unable to reset hardware; hal status %u\n",
status);
goto done;
}
/*
* Setup the hardware after reset: the key cache
* is filled as needed and the receive engine is
* set going. Frame transmit is handled entirely
* in the frame output path; there's nothing to do
* here except setup the interrupt mask.
*/
if (ic->ic_flags & IEEE80211_F_WEPON)
ath_initkeytable(sc);
if (ath_startrecv(sc) != 0) {
if_printf(ifp, "unable to start recv logic\n");
goto done;
}
/*
* Enable interrupts.
*/
sc->sc_imask = HAL_INT_RX | HAL_INT_TX
| HAL_INT_RXEOL | HAL_INT_RXORN
| HAL_INT_FATAL | HAL_INT_GLOBAL;
ath_hal_intrset(ah, sc->sc_imask);
ifp->if_flags |= IFF_RUNNING;
ic->ic_state = IEEE80211_S_INIT;
/*
* The hardware should be ready to go now so it's safe
* to kick the 802.11 state machine as it's likely to
* immediately call back to us to send mgmt frames.
*/
ni = ic->ic_bss;
ni->ni_chan = ic->ic_ibss_chan;
mode = ieee80211_chan2mode(ic, ni->ni_chan);
if (mode != sc->sc_curmode)
ath_setcurmode(sc, mode);
if (ic->ic_opmode != IEEE80211_M_MONITOR)
ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
else
ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
done:
ATH_UNLOCK(sc);
}
static void
ath_stop(struct ifnet *ifp)
{
struct ieee80211com *ic = (struct ieee80211com *) ifp;
struct ath_softc *sc = ifp->if_softc;
struct ath_hal *ah = sc->sc_ah;
DPRINTF(("ath_stop: invalid %u if_flags 0x%x\n",
sc->sc_invalid, ifp->if_flags));
ATH_LOCK(sc);
if (ifp->if_flags & IFF_RUNNING) {
/*
* Shutdown the hardware and driver:
* disable interrupts
* turn off timers
* clear transmit machinery
* clear receive machinery
* drain and release tx queues
* reclaim beacon resources
* reset 802.11 state machine
* power down hardware
*
* Note that some of this work is not possible if the
* hardware is gone (invalid).
*/
ifp->if_flags &= ~IFF_RUNNING;
ifp->if_timer = 0;
if (!sc->sc_invalid)
ath_hal_intrset(ah, 0);
ath_draintxq(sc);
if (!sc->sc_invalid)
ath_stoprecv(sc);
else
sc->sc_rxlink = NULL;
IF_DRAIN(&ifp->if_snd);
ath_beacon_free(sc);
ieee80211_new_state(ic, IEEE80211_S_INIT, -1);
if (!sc->sc_invalid)
ath_hal_setpower(ah, HAL_PM_FULL_SLEEP, 0);
}
ATH_UNLOCK(sc);
}
/*
* Reset the hardware w/o losing operational state. This is
* basically a more efficient way of doing ath_stop, ath_init,
* followed by state transitions to the current 802.11
* operational state. Used to recover from errors rx overrun
* and to reset the hardware when rf gain settings must be reset.
*/
static void
ath_reset(struct ath_softc *sc)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = &ic->ic_if;
struct ath_hal *ah = sc->sc_ah;
struct ieee80211_channel *c;
HAL_STATUS status;
HAL_CHANNEL hchan;
/*
* Convert to a HAL channel description with the flags
* constrained to reflect the current operating mode.
*/
c = ic->ic_ibss_chan;
hchan.channel = c->ic_freq;
hchan.channelFlags = ath_chan2flags(ic, c);
ath_hal_intrset(ah, 0); /* disable interrupts */
ath_draintxq(sc); /* stop xmit side */
ath_stoprecv(sc); /* stop recv side */
/* NB: indicate channel change so we do a full reset */
if (!ath_hal_reset(ah, ic->ic_opmode, &hchan, AH_TRUE, &status))
if_printf(ifp, "%s: unable to reset hardware; hal status %u\n",
__func__, status);
ath_hal_intrset(ah, sc->sc_imask);
if (ath_startrecv(sc) != 0) /* restart recv */
if_printf(ifp, "%s: unable to start recv logic\n", __func__);
ath_start(ifp); /* restart xmit */
if (ic->ic_state == IEEE80211_S_RUN)
ath_beacon_config(sc); /* restart beacons */
}
static void
ath_start(struct ifnet *ifp)
{
struct ath_softc *sc = ifp->if_softc;
struct ath_hal *ah = sc->sc_ah;
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211_node *ni;
struct ath_buf *bf;
struct mbuf *m;
struct ieee80211_frame *wh;
if ((ifp->if_flags & IFF_RUNNING) == 0 || sc->sc_invalid)
return;
for (;;) {
/*
* Grab a TX buffer and associated resources.
*/
ATH_TXBUF_LOCK(sc);
bf = TAILQ_FIRST(&sc->sc_txbuf);
if (bf != NULL)
TAILQ_REMOVE(&sc->sc_txbuf, bf, bf_list);
ATH_TXBUF_UNLOCK(sc);
if (bf == NULL) {
DPRINTF(("ath_start: out of xmit buffers\n"));
sc->sc_stats.ast_tx_qstop++;
ifp->if_flags |= IFF_OACTIVE;
break;
}
/*
* Poll the management queue for frames; they
* have priority over normal data frames.
*/
IF_DEQUEUE(&ic->ic_mgtq, m);
if (m == NULL) {
/*
* No data frames go out unless we're associated.
*/
if (ic->ic_state != IEEE80211_S_RUN) {
DPRINTF(("ath_start: ignore data packet, "
"state %u\n", ic->ic_state));
sc->sc_stats.ast_tx_discard++;
ATH_TXBUF_LOCK(sc);
TAILQ_INSERT_TAIL(&sc->sc_txbuf, bf, bf_list);
ATH_TXBUF_UNLOCK(sc);
break;
}
IF_DEQUEUE(&ifp->if_snd, m);
if (m == NULL) {
ATH_TXBUF_LOCK(sc);
TAILQ_INSERT_TAIL(&sc->sc_txbuf, bf, bf_list);
ATH_TXBUF_UNLOCK(sc);
break;
}
ifp->if_opackets++;
BPF_MTAP(ifp, m);
/*
* Encapsulate the packet in prep for transmission.
*/
m = ieee80211_encap(ifp, m, &ni);
if (m == NULL) {
DPRINTF(("ath_start: encapsulation failure\n"));
sc->sc_stats.ast_tx_encap++;
goto bad;
}
wh = mtod(m, struct ieee80211_frame *);
if (ic->ic_flags & IEEE80211_F_WEPON)
wh->i_fc[1] |= IEEE80211_FC1_WEP;
} else {
/*
* Hack! The referenced node pointer is in the
* rcvif field of the packet header. This is
* placed there by ieee80211_mgmt_output because
* we need to hold the reference with the frame
* and there's no other way (other than packet
* tags which we consider too expensive to use)
* to pass it along.
*/
ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
m->m_pkthdr.rcvif = NULL;
wh = mtod(m, struct ieee80211_frame *);
if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) ==
IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
/* fill time stamp */
u_int64_t tsf;
u_int32_t *tstamp;
tsf = ath_hal_gettsf64(ah);
/* XXX: adjust 100us delay to xmit */
tsf += 100;
tstamp = (u_int32_t *)&wh[1];
tstamp[0] = htole32(tsf & 0xffffffff);
tstamp[1] = htole32(tsf >> 32);
}
sc->sc_stats.ast_tx_mgmt++;
}
if (ic->ic_rawbpf)
bpf_mtap(ic->ic_rawbpf, m);
if (sc->sc_drvbpf) {
struct mbuf *mb;
MGETHDR(mb, M_DONTWAIT, m->m_type);
if (mb != NULL) {
sc->sc_tx_th.wt_rate =
ni->ni_rates.rs_rates[ni->ni_txrate];
mb->m_next = m;
mb->m_data = (caddr_t)&sc->sc_tx_th;
mb->m_len = sizeof(sc->sc_tx_th);
mb->m_pkthdr.len += mb->m_len;
bpf_mtap(sc->sc_drvbpf, mb);
m_free(mb);
}
}
if (ath_tx_start(sc, ni, bf, m)) {
bad:
ATH_TXBUF_LOCK(sc);
TAILQ_INSERT_TAIL(&sc->sc_txbuf, bf, bf_list);
ATH_TXBUF_UNLOCK(sc);
ifp->if_oerrors++;
if (ni && ni != ic->ic_bss)
ieee80211_free_node(ic, ni);
continue;
}
sc->sc_tx_timer = 5;
ifp->if_timer = 1;
}
}
static int
ath_media_change(struct ifnet *ifp)
{
int error;
error = ieee80211_media_change(ifp);
if (error == ENETRESET) {
if ((ifp->if_flags & (IFF_RUNNING|IFF_UP)) ==
(IFF_RUNNING|IFF_UP))
ath_init(ifp); /* XXX lose error */
error = 0;
}
return error;
}
static void
ath_watchdog(struct ifnet *ifp)
{
struct ath_softc *sc = ifp->if_softc;
struct ieee80211com *ic = &sc->sc_ic;
ifp->if_timer = 0;
if ((ifp->if_flags & IFF_RUNNING) == 0 || sc->sc_invalid)
return;
if (sc->sc_tx_timer) {
if (--sc->sc_tx_timer == 0) {
if_printf(ifp, "device timeout\n");
#ifdef AR_DEBUG
if (ath_debug)
ath_hal_dumpstate(sc->sc_ah);
#endif /* AR_DEBUG */
ath_init(ifp); /* XXX ath_reset??? */
ifp->if_oerrors++;
sc->sc_stats.ast_watchdog++;
return;
}
ifp->if_timer = 1;
}
if (ic->ic_fixed_rate == -1) {
/*
* Run the rate control algorithm if we're not
* locked at a fixed rate.
*/
if (ic->ic_opmode == IEEE80211_M_STA)
ath_rate_ctl(sc, ic->ic_bss);
else
ieee80211_iterate_nodes(ic, ath_rate_ctl, sc);
}
ieee80211_watchdog(ifp);
}
static int
ath_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ath_softc *sc = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
int error = 0;
ATH_LOCK(sc);
switch (cmd) {
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP) {
if (ifp->if_flags & IFF_RUNNING) {
/*
* To avoid rescanning another access point,
* do not call ath_init() here. Instead,
* only reflect promisc mode settings.
*/
ath_mode_init(sc);
} else {
/*
* Beware of being called during detach to
* reset promiscuous mode. In that case we
* will still be marked UP but not RUNNING.
* However trying to re-init the interface
* is the wrong thing to do as we've already
* torn down much of our state. There's
* probably a better way to deal with this.
*/
if (!sc->sc_invalid)
ath_init(ifp); /* XXX lose error */
}
} else
ath_stop(ifp);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
/*
* The upper layer has already installed/removed
* the multicast address(es), just recalculate the
* multicast filter for the card.
*/
if (ifp->if_flags & IFF_RUNNING)
ath_mode_init(sc);
break;
case SIOCGATHSTATS:
error = copyout(&sc->sc_stats,
ifr->ifr_data, sizeof (sc->sc_stats));
break;
case SIOCGATHDIAG: {
struct ath_diag *ad = (struct ath_diag *)data;
struct ath_hal *ah = sc->sc_ah;
void *data;
u_int size;
if (ath_hal_getdiagstate(ah, ad->ad_id, &data, &size)) {
if (size < ad->ad_size)
ad->ad_size = size;
if (data)
error = copyout(data, ad->ad_data, ad->ad_size);
} else
error = EINVAL;
break;
}
default:
error = ieee80211_ioctl(ifp, cmd, data);
if (error == ENETRESET) {
if ((ifp->if_flags & (IFF_RUNNING|IFF_UP)) ==
(IFF_RUNNING|IFF_UP))
ath_init(ifp); /* XXX lose error */
error = 0;
}
break;
}
ATH_UNLOCK(sc);
return error;
}
/*
* Fill the hardware key cache with key entries.
*/
static void
ath_initkeytable(struct ath_softc *sc)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ath_hal *ah = sc->sc_ah;
int i;
for (i = 0; i < IEEE80211_WEP_NKID; i++) {
struct ieee80211_wepkey *k = &ic->ic_nw_keys[i];
if (k->wk_len == 0)
ath_hal_keyreset(ah, i);
else
/* XXX return value */
/* NB: this uses HAL_KEYVAL == ieee80211_wepkey */
ath_hal_keyset(ah, i, (const HAL_KEYVAL *) k);
}
}
/*
* Calculate the receive filter according to the
* operating mode and state:
*
* o always accept unicast, broadcast, and multicast traffic
* o maintain current state of phy error reception
* o probe request frames are accepted only when operating in
* hostap, adhoc, or monitor modes
* o enable promiscuous mode according to the interface state
* o accept beacons:
* - when operating in adhoc mode so the 802.11 layer creates
* node table entries for peers,
* - when operating in station mode for collecting rssi data when
* the station is otherwise quiet, or
* - when scanning
*/
static u_int32_t
ath_calcrxfilter(struct ath_softc *sc)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ath_hal *ah = sc->sc_ah;
struct ifnet *ifp = &ic->ic_if;
u_int32_t rfilt;
rfilt = (ath_hal_getrxfilter(ah) & HAL_RX_FILTER_PHYERR)
| HAL_RX_FILTER_UCAST | HAL_RX_FILTER_BCAST | HAL_RX_FILTER_MCAST;
if (ic->ic_opmode != IEEE80211_M_STA)
rfilt |= HAL_RX_FILTER_PROBEREQ;
if (ic->ic_opmode != IEEE80211_M_HOSTAP &&
(ifp->if_flags & IFF_PROMISC))
rfilt |= HAL_RX_FILTER_PROM;
if (ic->ic_opmode == IEEE80211_M_STA ||
ic->ic_opmode == IEEE80211_M_IBSS ||
ic->ic_state == IEEE80211_S_SCAN)
rfilt |= HAL_RX_FILTER_BEACON;
return rfilt;
}
static void
ath_mode_init(struct ath_softc *sc)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ath_hal *ah = sc->sc_ah;
struct ifnet *ifp = &ic->ic_if;
u_int32_t rfilt, mfilt[2], val;
u_int8_t pos;
struct ifmultiaddr *ifma;
/* configure rx filter */
rfilt = ath_calcrxfilter(sc);
ath_hal_setrxfilter(ah, rfilt);
/* configure operational mode */
ath_hal_setopmode(ah, ic->ic_opmode);
/* calculate and install multicast filter */
if ((ifp->if_flags & IFF_ALLMULTI) == 0) {
mfilt[0] = mfilt[1] = 0;
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
caddr_t dl;
/* calculate XOR of eight 6bit values */
dl = LLADDR((struct sockaddr_dl *) ifma->ifma_addr);
val = LE_READ_4(dl + 0);
pos = (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
val = LE_READ_4(dl + 3);
pos ^= (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
pos &= 0x3f;
mfilt[pos / 32] |= (1 << (pos % 32));
}
} else {
mfilt[0] = mfilt[1] = ~0;
}
ath_hal_setmcastfilter(ah, mfilt[0], mfilt[1]);
DPRINTF(("ath_mode_init: RX filter 0x%x, MC filter %08x:%08x\n",
rfilt, mfilt[0], mfilt[1]));
}
static void
ath_mbuf_load_cb(void *arg, bus_dma_segment_t *seg, int nseg, bus_size_t mapsize, int error)
{
struct ath_buf *bf = arg;
KASSERT(nseg <= ATH_MAX_SCATTER,
("ath_mbuf_load_cb: too many DMA segments %u", nseg));
bf->bf_mapsize = mapsize;
bf->bf_nseg = nseg;
bcopy(seg, bf->bf_segs, nseg * sizeof (seg[0]));
}
static int
ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_node *ni)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = &ic->ic_if;
struct ath_hal *ah = sc->sc_ah;
struct ieee80211_frame *wh;
struct ath_buf *bf;
struct ath_desc *ds;
struct mbuf *m;
int error, pktlen;
u_int8_t *frm, rate;
u_int16_t capinfo;
struct ieee80211_rateset *rs;
const HAL_RATE_TABLE *rt;
bf = sc->sc_bcbuf;
if (bf->bf_m != NULL) {
bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap);
m_freem(bf->bf_m);
bf->bf_m = NULL;
bf->bf_node = NULL;
}
/*
* NB: the beacon data buffer must be 32-bit aligned;
* we assume the mbuf routines will return us something
* with this alignment (perhaps should assert).
*/
rs = &ni->ni_rates;
pktlen = sizeof (struct ieee80211_frame)
+ 8 + 2 + 2 + 2+ni->ni_esslen + 2+rs->rs_nrates + 3 + 6;
if (rs->rs_nrates > IEEE80211_RATE_SIZE)
pktlen += 2;
if (pktlen <= MHLEN)
MGETHDR(m, M_DONTWAIT, MT_DATA);
else
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
if (m == NULL) {
DPRINTF(("ath_beacon_alloc: cannot get mbuf/cluster; size %u\n",
pktlen));
sc->sc_stats.ast_be_nombuf++;
return ENOMEM;
}
wh = mtod(m, struct ieee80211_frame *);
wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
IEEE80211_FC0_SUBTYPE_BEACON;
wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
*(u_int16_t *)wh->i_dur = 0;
memcpy(wh->i_addr1, ifp->if_broadcastaddr, IEEE80211_ADDR_LEN);
memcpy(wh->i_addr2, ic->ic_myaddr, IEEE80211_ADDR_LEN);
memcpy(wh->i_addr3, ni->ni_bssid, IEEE80211_ADDR_LEN);
*(u_int16_t *)wh->i_seq = 0;
/*
* beacon frame format
* [8] time stamp
* [2] beacon interval
* [2] cabability information
* [tlv] ssid
* [tlv] supported rates
* [tlv] parameter set (IBSS)
* [tlv] extended supported rates
*/
frm = (u_int8_t *)&wh[1];
memset(frm, 0, 8); /* timestamp is set by hardware */
frm += 8;
*(u_int16_t *)frm = htole16(ni->ni_intval);
frm += 2;
if (ic->ic_opmode == IEEE80211_M_IBSS)
capinfo = IEEE80211_CAPINFO_IBSS;
else
capinfo = IEEE80211_CAPINFO_ESS;
if (ic->ic_flags & IEEE80211_F_WEPON)
capinfo |= IEEE80211_CAPINFO_PRIVACY;
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
IEEE80211_IS_CHAN_2GHZ(ni->ni_chan))
capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
if (ic->ic_flags & IEEE80211_F_SHSLOT)
capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
*(u_int16_t *)frm = htole16(capinfo);
frm += 2;
*frm++ = IEEE80211_ELEMID_SSID;
*frm++ = ni->ni_esslen;
memcpy(frm, ni->ni_essid, ni->ni_esslen);
frm += ni->ni_esslen;
frm = ieee80211_add_rates(frm, rs);
*frm++ = IEEE80211_ELEMID_DSPARMS;
*frm++ = 1;
*frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
if (ic->ic_opmode == IEEE80211_M_IBSS) {
*frm++ = IEEE80211_ELEMID_IBSSPARMS;
*frm++ = 2;
*frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
} else {
/* TODO: TIM */
*frm++ = IEEE80211_ELEMID_TIM;
*frm++ = 4; /* length */
*frm++ = 0; /* DTIM count */
*frm++ = 1; /* DTIM period */
*frm++ = 0; /* bitmap control */
*frm++ = 0; /* Partial Virtual Bitmap (variable length) */
}
frm = ieee80211_add_xrates(frm, rs);
m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *);
KASSERT(m->m_pkthdr.len <= pktlen,
("beacon bigger than expected, len %u calculated %u",
m->m_pkthdr.len, pktlen));
DPRINTF2(("ath_beacon_alloc: m %p len %u\n", m, m->m_len));
error = bus_dmamap_load_mbuf(sc->sc_dmat, bf->bf_dmamap, m,
ath_mbuf_load_cb, bf,
BUS_DMA_NOWAIT);
if (error != 0) {
m_freem(m);
return error;
}
KASSERT(bf->bf_nseg == 1,
("ath_beacon_alloc: multi-segment packet; nseg %u",
bf->bf_nseg));
bf->bf_m = m;
/* setup descriptors */
ds = bf->bf_desc;
ds->ds_link = 0;
ds->ds_data = bf->bf_segs[0].ds_addr;
/*
* Calculate rate code.
* XXX everything at min xmit rate
*/
rt = sc->sc_currates;
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
if (ic->ic_flags & IEEE80211_F_SHPREAMBLE)
rate = rt->info[0].rateCode | rt->info[0].shortPreamble;
else
rate = rt->info[0].rateCode;
ath_hal_setuptxdesc(ah, ds
, m->m_pkthdr.len + IEEE80211_CRC_LEN /* packet length */
, sizeof(struct ieee80211_frame) /* header length */
, HAL_PKT_TYPE_BEACON /* Atheros packet type */
, 0x20 /* txpower XXX */
, rate, 1 /* series 0 rate/tries */
, HAL_TXKEYIX_INVALID /* no encryption */
, 0 /* antenna mode */
, HAL_TXDESC_NOACK /* no ack for beacons */
, 0 /* rts/cts rate */
, 0 /* rts/cts duration */
);
/* NB: beacon's BufLen must be a multiple of 4 bytes */
/* XXX verify mbuf data area covers this roundup */
ath_hal_filltxdesc(ah, ds
, roundup(bf->bf_segs[0].ds_len, 4) /* buffer length */
, AH_TRUE /* first segment */
, AH_TRUE /* last segment */
);
return 0;
}
static void
ath_beacon_proc(void *arg, int pending)
{
struct ath_softc *sc = arg;
struct ieee80211com *ic = &sc->sc_ic;
struct ath_buf *bf = sc->sc_bcbuf;
struct ath_hal *ah = sc->sc_ah;
DPRINTF2(("%s: pending %u\n", __func__, pending));
if (ic->ic_opmode == IEEE80211_M_STA ||
bf == NULL || bf->bf_m == NULL) {
DPRINTF(("%s: ic_flags=%x bf=%p bf_m=%p\n",
__func__, ic->ic_flags, bf, bf ? bf->bf_m : NULL));
return;
}
/* TODO: update beacon to reflect PS poll state */
if (!ath_hal_stoptxdma(ah, sc->sc_bhalq)) {
DPRINTF(("%s: beacon queue %u did not stop?",
__func__, sc->sc_bhalq));
return; /* busy, XXX is this right? */
}
bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
ath_hal_puttxbuf(ah, sc->sc_bhalq, bf->bf_daddr);
ath_hal_txstart(ah, sc->sc_bhalq);
DPRINTF2(("%s: TXDP%u = %p (%p)\n", __func__,
sc->sc_bhalq, (caddr_t)bf->bf_daddr, bf->bf_desc));
}
static void
ath_beacon_free(struct ath_softc *sc)
{
struct ath_buf *bf = sc->sc_bcbuf;
if (bf->bf_m != NULL) {
bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap);
m_freem(bf->bf_m);
bf->bf_m = NULL;
bf->bf_node = NULL;
}
}
/*
* Configure the beacon and sleep timers.
*
* When operating as an AP this resets the TSF and sets
* up the hardware to notify us when we need to issue beacons.
*
* When operating in station mode this sets up the beacon
* timers according to the timestamp of the last received
* beacon and the current TSF, configures PCF and DTIM
* handling, programs the sleep registers so the hardware
* will wakeup in time to receive beacons, and configures
* the beacon miss handling so we'll receive a BMISS
* interrupt when we stop seeing beacons from the AP
* we've associated with.
*/
static void
ath_beacon_config(struct ath_softc *sc)
{
struct ath_hal *ah = sc->sc_ah;
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211_node *ni = ic->ic_bss;
u_int32_t nexttbtt;
nexttbtt = (LE_READ_4(ni->ni_tstamp + 4) << 22) |
(LE_READ_4(ni->ni_tstamp) >> 10);
DPRINTF(("%s: nexttbtt=%u\n", __func__, nexttbtt));
nexttbtt += ni->ni_intval;
if (ic->ic_opmode == IEEE80211_M_STA) {
HAL_BEACON_STATE bs;
u_int32_t bmisstime;
/* NB: no PCF support right now */
memset(&bs, 0, sizeof(bs));
bs.bs_intval = ni->ni_intval;
bs.bs_nexttbtt = nexttbtt;
bs.bs_dtimperiod = bs.bs_intval;
bs.bs_nextdtim = nexttbtt;
/*
* Calculate the number of consecutive beacons to miss
* before taking a BMISS interrupt. The configuration
* is specified in ms, so we need to convert that to
* TU's and then calculate based on the beacon interval.
* Note that we clamp the result to at most 10 beacons.
*/
bmisstime = (ic->ic_bmisstimeout * 1000) / 1024;
bs.bs_bmissthreshold = howmany(bmisstime,ni->ni_intval);
if (bs.bs_bmissthreshold > 10)
bs.bs_bmissthreshold = 10;
else if (bs.bs_bmissthreshold <= 0)
bs.bs_bmissthreshold = 1;
/*
* Calculate sleep duration. The configuration is
* given in ms. We insure a multiple of the beacon
* period is used. Also, if the sleep duration is
* greater than the DTIM period then it makes senses
* to make it a multiple of that.
*
* XXX fixed at 100ms
*/
bs.bs_sleepduration =
roundup((100 * 1000) / 1024, bs.bs_intval);
if (bs.bs_sleepduration > bs.bs_dtimperiod)
bs.bs_sleepduration = roundup(bs.bs_sleepduration, bs.bs_dtimperiod);
DPRINTF(("%s: intval %u nexttbtt %u dtim %u nextdtim %u bmiss %u sleep %u\n"
, __func__
, bs.bs_intval
, bs.bs_nexttbtt
, bs.bs_dtimperiod
, bs.bs_nextdtim
, bs.bs_bmissthreshold
, bs.bs_sleepduration
));
ath_hal_intrset(ah, 0);
/*
* Reset our tsf so the hardware will update the
* tsf register to reflect timestamps found in
* received beacons.
*/
ath_hal_resettsf(ah);
ath_hal_beacontimers(ah, &bs, 0/*XXX*/, 0, 0);
sc->sc_imask |= HAL_INT_BMISS;
ath_hal_intrset(ah, sc->sc_imask);
} else {
DPRINTF(("%s: intval %u nexttbtt %u\n",
__func__, ni->ni_intval, nexttbtt));
ath_hal_intrset(ah, 0);
ath_hal_beaconinit(ah, ic->ic_opmode,
nexttbtt, ni->ni_intval);
if (ic->ic_opmode != IEEE80211_M_MONITOR)
sc->sc_imask |= HAL_INT_SWBA; /* beacon prepare */
ath_hal_intrset(ah, sc->sc_imask);
}
}
static void
ath_load_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
bus_addr_t *paddr = (bus_addr_t*) arg;
*paddr = segs->ds_addr;
}
static int
ath_desc_alloc(struct ath_softc *sc)
{
int i, bsize, error;
struct ath_desc *ds;
struct ath_buf *bf;
/* allocate descriptors */
sc->sc_desc_len = sizeof(struct ath_desc) *
(ATH_TXBUF * ATH_TXDESC + ATH_RXBUF + 1);
error = bus_dmamap_create(sc->sc_dmat, BUS_DMA_NOWAIT, &sc->sc_ddmamap);
if (error != 0)
return error;
error = bus_dmamem_alloc(sc->sc_dmat, (void**) &sc->sc_desc,
BUS_DMA_NOWAIT, &sc->sc_ddmamap);
if (error != 0)
goto fail0;
error = bus_dmamap_load(sc->sc_dmat, sc->sc_ddmamap,
sc->sc_desc, sc->sc_desc_len,
ath_load_cb, &sc->sc_desc_paddr,
BUS_DMA_NOWAIT);
if (error != 0)
goto fail1;
ds = sc->sc_desc;
DPRINTF(("ath_desc_alloc: DMA map: %p (%d) -> %p (%lu)\n",
ds, sc->sc_desc_len,
(caddr_t) sc->sc_desc_paddr, /*XXX*/ (u_long) sc->sc_desc_len));
/* allocate buffers */
bsize = sizeof(struct ath_buf) * (ATH_TXBUF + ATH_RXBUF + 1);
bf = malloc(bsize, M_DEVBUF, M_NOWAIT | M_ZERO);
if (bf == NULL)
goto fail2;
sc->sc_bufptr = bf;
TAILQ_INIT(&sc->sc_rxbuf);
for (i = 0; i < ATH_RXBUF; i++, bf++, ds++) {
bf->bf_desc = ds;
bf->bf_daddr = sc->sc_desc_paddr +
((caddr_t)ds - (caddr_t)sc->sc_desc);
error = bus_dmamap_create(sc->sc_dmat, BUS_DMA_NOWAIT,
&bf->bf_dmamap);
if (error != 0)
break;
TAILQ_INSERT_TAIL(&sc->sc_rxbuf, bf, bf_list);
}
TAILQ_INIT(&sc->sc_txbuf);
for (i = 0; i < ATH_TXBUF; i++, bf++, ds += ATH_TXDESC) {
bf->bf_desc = ds;
bf->bf_daddr = sc->sc_desc_paddr +
((caddr_t)ds - (caddr_t)sc->sc_desc);
error = bus_dmamap_create(sc->sc_dmat, BUS_DMA_NOWAIT,
&bf->bf_dmamap);
if (error != 0)
break;
TAILQ_INSERT_TAIL(&sc->sc_txbuf, bf, bf_list);
}
TAILQ_INIT(&sc->sc_txq);
/* beacon buffer */
bf->bf_desc = ds;
bf->bf_daddr = sc->sc_desc_paddr + ((caddr_t)ds - (caddr_t)sc->sc_desc);
error = bus_dmamap_create(sc->sc_dmat, BUS_DMA_NOWAIT, &bf->bf_dmamap);
if (error != 0)
return error;
sc->sc_bcbuf = bf;
return 0;
fail2:
bus_dmamap_unload(sc->sc_dmat, sc->sc_ddmamap);
fail1:
bus_dmamem_free(sc->sc_dmat, sc->sc_desc, sc->sc_ddmamap);
fail0:
bus_dmamap_destroy(sc->sc_dmat, sc->sc_ddmamap);
sc->sc_ddmamap = NULL;
return error;
}
static void
ath_desc_free(struct ath_softc *sc)
{
struct ath_buf *bf;
bus_dmamap_unload(sc->sc_dmat, sc->sc_ddmamap);
bus_dmamem_free(sc->sc_dmat, sc->sc_desc, sc->sc_ddmamap);
bus_dmamap_destroy(sc->sc_dmat, sc->sc_ddmamap);
TAILQ_FOREACH(bf, &sc->sc_txq, bf_list) {
bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap);
bus_dmamap_destroy(sc->sc_dmat, bf->bf_dmamap);
m_freem(bf->bf_m);
}
TAILQ_FOREACH(bf, &sc->sc_txbuf, bf_list)
bus_dmamap_destroy(sc->sc_dmat, bf->bf_dmamap);
TAILQ_FOREACH(bf, &sc->sc_rxbuf, bf_list) {
if (bf->bf_m) {
bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap);
bus_dmamap_destroy(sc->sc_dmat, bf->bf_dmamap);
m_freem(bf->bf_m);
bf->bf_m = NULL;
}
}
if (sc->sc_bcbuf != NULL) {
bus_dmamap_unload(sc->sc_dmat, sc->sc_bcbuf->bf_dmamap);
bus_dmamap_destroy(sc->sc_dmat, sc->sc_bcbuf->bf_dmamap);
sc->sc_bcbuf = NULL;
}
TAILQ_INIT(&sc->sc_rxbuf);
TAILQ_INIT(&sc->sc_txbuf);
TAILQ_INIT(&sc->sc_txq);
free(sc->sc_bufptr, M_DEVBUF);
sc->sc_bufptr = NULL;
}
static struct ieee80211_node *
ath_node_alloc(struct ieee80211com *ic)
{
struct ath_node *an =
malloc(sizeof(struct ath_node), M_DEVBUF, M_NOWAIT | M_ZERO);
if (an) {
int i;
for (i = 0; i < ATH_RHIST_SIZE; i++)
an->an_rx_hist[i].arh_ticks = ATH_RHIST_NOTIME;
an->an_rx_hist_next = ATH_RHIST_SIZE-1;
return &an->an_node;
} else
return NULL;
}
static void
ath_node_free(struct ieee80211com *ic, struct ieee80211_node *ni)
{
struct ath_softc *sc = ic->ic_if.if_softc;
struct ath_buf *bf;
TAILQ_FOREACH(bf, &sc->sc_txq, bf_list) {
if (bf->bf_node == ni)
bf->bf_node = NULL;
}
free(ni, M_DEVBUF);
}
static void
ath_node_copy(struct ieee80211com *ic,
struct ieee80211_node *dst, const struct ieee80211_node *src)
{
*(struct ath_node *)dst = *(const struct ath_node *)src;
}
static u_int8_t
ath_node_getrssi(struct ieee80211com *ic, struct ieee80211_node *ni)
{
struct ath_node *an = ATH_NODE(ni);
int i, now, nsamples, rssi;
/*
* Calculate the average over the last second of sampled data.
*/
now = ticks;
nsamples = 0;
rssi = 0;
i = an->an_rx_hist_next;
do {
struct ath_recv_hist *rh = &an->an_rx_hist[i];
if (rh->arh_ticks == ATH_RHIST_NOTIME)
goto done;
if (now - rh->arh_ticks > hz)
goto done;
rssi += rh->arh_rssi;
nsamples++;
if (i == 0)
i = ATH_RHIST_SIZE-1;
else
i--;
} while (i != an->an_rx_hist_next);
done:
/*
* Return either the average or the last known
* value if there is no recent data.
*/
return (nsamples ? rssi / nsamples : an->an_rx_hist[i].arh_rssi);
}
static int
ath_rxbuf_init(struct ath_softc *sc, struct ath_buf *bf)
{
struct ath_hal *ah = sc->sc_ah;
int error;
struct mbuf *m;
struct ath_desc *ds;
m = bf->bf_m;
if (m == NULL) {
/*
* NB: by assigning a page to the rx dma buffer we
* implicitly satisfy the Atheros requirement that
* this buffer be cache-line-aligned and sized to be
* multiple of the cache line size. Not doing this
* causes weird stuff to happen (for the 5210 at least).
*/
m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
if (m == NULL) {
DPRINTF(("ath_rxbuf_init: no mbuf/cluster\n"));
sc->sc_stats.ast_rx_nombuf++;
return ENOMEM;
}
bf->bf_m = m;
m->m_pkthdr.len = m->m_len = m->m_ext.ext_size;
error = bus_dmamap_load_mbuf(sc->sc_dmat, bf->bf_dmamap, m,
ath_mbuf_load_cb, bf,
BUS_DMA_NOWAIT);
if (error != 0) {
DPRINTF(("ath_rxbuf_init: bus_dmamap_load_mbuf failed;"
" error %d\n", error));
sc->sc_stats.ast_rx_busdma++;
return error;
}
KASSERT(bf->bf_nseg == 1,
("ath_rxbuf_init: multi-segment packet; nseg %u",
bf->bf_nseg));
}
bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREREAD);
/*
* Setup descriptors. For receive we always terminate
* the descriptor list with a self-linked entry so we'll
* not get overrun under high load (as can happen with a
* 5212 when ANI processing enables PHY errors).
*
* To insure the last descriptor is self-linked we create
* each descriptor as self-linked and add it to the end. As
* each additional descriptor is added the previous self-linked
* entry is ``fixed'' naturally. This should be safe even
* if DMA is happening. When processing RX interrupts we
* never remove/process the last, self-linked, entry on the
* descriptor list. This insures the hardware always has
* someplace to write a new frame.
*/
ds = bf->bf_desc;
ds->ds_link = bf->bf_daddr; /* link to self */
ds->ds_data = bf->bf_segs[0].ds_addr;
ath_hal_setuprxdesc(ah, ds
, m->m_len /* buffer size */
, 0
);
if (sc->sc_rxlink != NULL)
*sc->sc_rxlink = bf->bf_daddr;
sc->sc_rxlink = &ds->ds_link;
return 0;
}
static void
ath_rx_proc(void *arg, int npending)
{
#define PA2DESC(_sc, _pa) \
((struct ath_desc *)((caddr_t)(_sc)->sc_desc + \
((_pa) - (_sc)->sc_desc_paddr)))
struct ath_softc *sc = arg;
struct ath_buf *bf;
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = &ic->ic_if;
struct ath_hal *ah = sc->sc_ah;
struct ath_desc *ds;
struct mbuf *m;
struct ieee80211_frame *wh, whbuf;
struct ieee80211_node *ni;
struct ath_node *an;
struct ath_recv_hist *rh;
int len;
u_int phyerr;
HAL_STATUS status;
DPRINTF2(("ath_rx_proc: pending %u\n", npending));
do {
bf = TAILQ_FIRST(&sc->sc_rxbuf);
if (bf == NULL) { /* NB: shouldn't happen */
if_printf(ifp, "ath_rx_proc: no buffer!\n");
break;
}
ds = bf->bf_desc;
if (ds->ds_link == bf->bf_daddr) {
/* NB: never process the self-linked entry at the end */
break;
}
m = bf->bf_m;
if (m == NULL) { /* NB: shouldn't happen */
if_printf(ifp, "ath_rx_proc: no mbuf!\n");
continue;
}
/* XXX sync descriptor memory */
/*
* Must provide the virtual address of the current
* descriptor, the physical address, and the virtual
* address of the next descriptor in the h/w chain.
* This allows the HAL to look ahead to see if the
* hardware is done with a descriptor by checking the
* done bit in the following descriptor and the address
* of the current descriptor the DMA engine is working
* on. All this is necessary because of our use of
* a self-linked list to avoid rx overruns.
*/
status = ath_hal_rxprocdesc(ah, ds,
bf->bf_daddr, PA2DESC(sc, ds->ds_link));
#ifdef AR_DEBUG
if (ath_debug > 1)
ath_printrxbuf(bf, status == HAL_OK);
#endif
if (status == HAL_EINPROGRESS)
break;
TAILQ_REMOVE(&sc->sc_rxbuf, bf, bf_list);
if (ds->ds_rxstat.rs_status != 0) {
if (ds->ds_rxstat.rs_status & HAL_RXERR_CRC)
sc->sc_stats.ast_rx_crcerr++;
if (ds->ds_rxstat.rs_status & HAL_RXERR_FIFO)
sc->sc_stats.ast_rx_fifoerr++;
if (ds->ds_rxstat.rs_status & HAL_RXERR_DECRYPT)
sc->sc_stats.ast_rx_badcrypt++;
if (ds->ds_rxstat.rs_status & HAL_RXERR_PHY) {
sc->sc_stats.ast_rx_phyerr++;
phyerr = ds->ds_rxstat.rs_phyerr & 0x1f;
sc->sc_stats.ast_rx_phy[phyerr]++;
} else {
/*
* NB: don't count PHY errors as input errors;
* we enable them on the 5212 to collect info
* about environmental noise and, in that
* setting, they don't really reflect tx/rx
* errors.
*/
ifp->if_ierrors++;
}
goto rx_next;
}
len = ds->ds_rxstat.rs_datalen;
if (len < IEEE80211_MIN_LEN) {
DPRINTF(("ath_rx_proc: short packet %d\n", len));
sc->sc_stats.ast_rx_tooshort++;
goto rx_next;
}
bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap);
bf->bf_m = NULL;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = len;
if (sc->sc_drvbpf) {
struct mbuf *mb;
/* XXX pre-allocate space when setting up recv's */
MGETHDR(mb, M_DONTWAIT, m->m_type);
if (mb != NULL) {
sc->sc_rx_th.wr_rate =
sc->sc_hwmap[ds->ds_rxstat.rs_rate];
sc->sc_rx_th.wr_antsignal =
ds->ds_rxstat.rs_rssi;
sc->sc_rx_th.wr_antenna =
ds->ds_rxstat.rs_antenna;
/* XXX TSF */
(void) m_dup_pkthdr(mb, m, M_DONTWAIT);
mb->m_next = m;
mb->m_data = (caddr_t)&sc->sc_rx_th;
mb->m_len = sizeof(sc->sc_rx_th);
mb->m_pkthdr.len += mb->m_len;
bpf_mtap(sc->sc_drvbpf, mb);
m_free(mb);
}
}
m_adj(m, -IEEE80211_CRC_LEN);
wh = mtod(m, struct ieee80211_frame *);
if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
/*
* WEP is decrypted by hardware. Clear WEP bit
* and trim WEP header for ieee80211_input().
*/
wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
memcpy(&whbuf, wh, sizeof(whbuf));
m_adj(m, IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN);
wh = mtod(m, struct ieee80211_frame *);
memcpy(wh, &whbuf, sizeof(whbuf));
/*
* Also trim WEP ICV from the tail.
*/
m_adj(m, -IEEE80211_WEP_CRCLEN);
}
/*
* Locate the node for sender, track state, and
* then pass this node (referenced) up to the 802.11
* layer for its use. We are required to pass
* something so we fall back to ic_bss when this frame
* is from an unknown sender.
*/
if (ic->ic_opmode != IEEE80211_M_STA) {
ni = ieee80211_find_node(ic, wh->i_addr2);
if (ni == NULL)
ni = ieee80211_ref_node(ic->ic_bss);
} else
ni = ieee80211_ref_node(ic->ic_bss);
/*
* Record driver-specific state.
*/
an = ATH_NODE(ni);
if (++(an->an_rx_hist_next) == ATH_RHIST_SIZE)
an->an_rx_hist_next = 0;
rh = &an->an_rx_hist[an->an_rx_hist_next];
rh->arh_ticks = ticks;
rh->arh_rssi = ds->ds_rxstat.rs_rssi;
rh->arh_antenna = ds->ds_rxstat.rs_antenna;
/*
* Send frame up for processing.
*/
ieee80211_input(ifp, m, ni,
ds->ds_rxstat.rs_rssi, ds->ds_rxstat.rs_tstamp);
/*
* The frame may have caused the node to be marked for
* reclamation (e.g. in response to a DEAUTH message)
* so use free_node here instead of unref_node.
*/
if (ni == ic->ic_bss)
ieee80211_unref_node(&ni);
else
ieee80211_free_node(ic, ni);
rx_next:
TAILQ_INSERT_TAIL(&sc->sc_rxbuf, bf, bf_list);
} while (ath_rxbuf_init(sc, bf) == 0);
ath_hal_rxmonitor(ah); /* rx signal state monitoring */
ath_hal_rxena(ah); /* in case of RXEOL */
#undef PA2DESC
}
/*
* XXX Size of an ACK control frame in bytes.
*/
#define IEEE80211_ACK_SIZE (2+2+IEEE80211_ADDR_LEN+4)
static int
ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni, struct ath_buf *bf,
struct mbuf *m0)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ath_hal *ah = sc->sc_ah;
struct ifnet *ifp = &sc->sc_ic.ic_if;
int i, error, iswep, hdrlen, pktlen;
u_int8_t rix, cix, txrate, ctsrate;
struct ath_desc *ds;
struct mbuf *m;
struct ieee80211_frame *wh;
u_int32_t iv;
u_int8_t *ivp;
u_int8_t hdrbuf[sizeof(struct ieee80211_frame) +
IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN];
u_int subtype, flags, ctsduration, antenna;
HAL_PKT_TYPE atype;
const HAL_RATE_TABLE *rt;
HAL_BOOL shortPreamble;
struct ath_node *an;
wh = mtod(m0, struct ieee80211_frame *);
iswep = wh->i_fc[1] & IEEE80211_FC1_WEP;
hdrlen = sizeof(struct ieee80211_frame);
pktlen = m0->m_pkthdr.len;
if (iswep) {
memcpy(hdrbuf, mtod(m0, caddr_t), hdrlen);
m_adj(m0, hdrlen);
M_PREPEND(m0, sizeof(hdrbuf), M_DONTWAIT);
if (m0 == NULL) {
sc->sc_stats.ast_tx_nombuf++;
return ENOMEM;
}
ivp = hdrbuf + hdrlen;
wh = mtod(m0, struct ieee80211_frame *);
/*
* XXX
* IV must not duplicate during the lifetime of the key.
* But no mechanism to renew keys is defined in IEEE 802.11
* WEP. And IV may be duplicated between other stations
* because of the session key itself is shared.
* So we use pseudo random IV for now, though it is not the
* right way.
*/
iv = ic->ic_iv;
/*
* Skip 'bad' IVs from Fluhrer/Mantin/Shamir:
* (B, 255, N) with 3 <= B < 8
*/
if (iv >= 0x03ff00 && (iv & 0xf8ff00) == 0x00ff00)
iv += 0x000100;
ic->ic_iv = iv + 1;
for (i = 0; i < IEEE80211_WEP_IVLEN; i++) {
ivp[i] = iv;
iv >>= 8;
}
ivp[i] = sc->sc_ic.ic_wep_txkey << 6; /* Key ID and pad */
memcpy(mtod(m0, caddr_t), hdrbuf, sizeof(hdrbuf));
/*
* The ICV length must be included into hdrlen and pktlen.
*/
hdrlen = sizeof(hdrbuf) + IEEE80211_WEP_CRCLEN;
pktlen = m0->m_pkthdr.len + IEEE80211_WEP_CRCLEN;
}
pktlen += IEEE80211_CRC_LEN;
/*
* Load the DMA map so any coalescing is done. This
* also calculates the number of descriptors we need.
*/
error = bus_dmamap_load_mbuf(sc->sc_dmat, bf->bf_dmamap, m0,
ath_mbuf_load_cb, bf,
BUS_DMA_NOWAIT);
if (error == EFBIG) {
/* XXX packet requires too many descriptors */
bf->bf_nseg = ATH_TXDESC+1;
} else if (error != 0) {
sc->sc_stats.ast_tx_busdma++;
m_freem(m0);
return error;
}
/*
* Discard null packets and check for packets that
* require too many TX descriptors. We try to convert
* the latter to a cluster.
*/
if (bf->bf_nseg > ATH_TXDESC) { /* too many desc's, linearize */
sc->sc_stats.ast_tx_linear++;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
sc->sc_stats.ast_tx_nombuf++;
m_freem(m0);
return ENOMEM;
}
M_MOVE_PKTHDR(m, m0);
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
sc->sc_stats.ast_tx_nomcl++;
m_freem(m0);
m_free(m);
return ENOMEM;
}
m_copydata(m0, 0, m0->m_pkthdr.len, mtod(m, caddr_t));
m_freem(m0);
m->m_len = m->m_pkthdr.len;
m0 = m;
error = bus_dmamap_load_mbuf(sc->sc_dmat, bf->bf_dmamap, m0,
ath_mbuf_load_cb, bf,
BUS_DMA_NOWAIT);
if (error != 0) {
sc->sc_stats.ast_tx_busdma++;
m_freem(m0);
return error;
}
KASSERT(bf->bf_nseg == 1,
("ath_tx_start: packet not one segment; nseg %u",
bf->bf_nseg));
} else if (bf->bf_nseg == 0) { /* null packet, discard */
sc->sc_stats.ast_tx_nodata++;
m_freem(m0);
return EIO;
}
DPRINTF2(("ath_tx_start: m %p len %u\n", m0, pktlen));
bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
bf->bf_m = m0;
bf->bf_node = ni; /* NB: held reference */
/* setup descriptors */
ds = bf->bf_desc;
rt = sc->sc_currates;
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
/*
* Calculate Atheros packet type from IEEE80211 packet header
* and setup for rate calculations.
*/
atype = HAL_PKT_TYPE_NORMAL; /* default */
switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
case IEEE80211_FC0_TYPE_MGT:
subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
if (subtype == IEEE80211_FC0_SUBTYPE_BEACON)
atype = HAL_PKT_TYPE_BEACON;
else if (subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
atype = HAL_PKT_TYPE_PROBE_RESP;
else if (subtype == IEEE80211_FC0_SUBTYPE_ATIM)
atype = HAL_PKT_TYPE_ATIM;
rix = 0; /* XXX lowest rate */
break;
case IEEE80211_FC0_TYPE_CTL:
subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
if (subtype == IEEE80211_FC0_SUBTYPE_PS_POLL)
atype = HAL_PKT_TYPE_PSPOLL;
rix = 0; /* XXX lowest rate */
break;
default:
rix = sc->sc_rixmap[ni->ni_rates.rs_rates[ni->ni_txrate] &
IEEE80211_RATE_VAL];
if (rix == 0xff) {
if_printf(ifp, "bogus xmit rate 0x%x\n",
ni->ni_rates.rs_rates[ni->ni_txrate]);
sc->sc_stats.ast_tx_badrate++;
m_freem(m0);
return EIO;
}
break;
}
/*
* NB: the 802.11 layer marks whether or not we should
* use short preamble based on the current mode and
* negotiated parameters.
*/
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
txrate = rt->info[rix].rateCode | rt->info[rix].shortPreamble;
shortPreamble = AH_TRUE;
sc->sc_stats.ast_tx_shortpre++;
} else {
txrate = rt->info[rix].rateCode;
shortPreamble = AH_FALSE;
}
/*
* Calculate miscellaneous flags.
*/
flags = HAL_TXDESC_CLRDMASK; /* XXX needed for wep errors */
if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
flags |= HAL_TXDESC_NOACK; /* no ack on broad/multicast */
sc->sc_stats.ast_tx_noack++;
} else if (pktlen > ic->ic_rtsthreshold) {
flags |= HAL_TXDESC_RTSENA; /* RTS based on frame length */
sc->sc_stats.ast_tx_rts++;
}
/*
* Calculate duration. This logically belongs in the 802.11
* layer but it lacks sufficient information to calculate it.
*/
if ((flags & HAL_TXDESC_NOACK) == 0 &&
(wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) {
u_int16_t dur;
/*
* XXX not right with fragmentation.
*/
dur = ath_hal_computetxtime(ah, rt, IEEE80211_ACK_SIZE,
rix, shortPreamble);
*((u_int16_t*) wh->i_dur) = htole16(dur);
}
/*
* Calculate RTS/CTS rate and duration if needed.
*/
ctsduration = 0;
if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA)) {
/*
* CTS transmit rate is derived from the transmit rate
* by looking in the h/w rate table. We must also factor
* in whether or not a short preamble is to be used.
*/
cix = rt->info[rix].controlRate;
ctsrate = rt->info[cix].rateCode;
if (shortPreamble)
ctsrate |= rt->info[cix].shortPreamble;
/*
* Compute the transmit duration based on the size
* of an ACK frame. We call into the HAL to do the
* computation since it depends on the characteristics
* of the actual PHY being used.
*/
if (flags & HAL_TXDESC_RTSENA) { /* SIFS + CTS */
ctsduration += ath_hal_computetxtime(ah,
rt, IEEE80211_ACK_SIZE, cix, shortPreamble);
}
/* SIFS + data */
ctsduration += ath_hal_computetxtime(ah,
rt, pktlen, rix, shortPreamble);
if ((flags & HAL_TXDESC_NOACK) == 0) { /* SIFS + ACK */
ctsduration += ath_hal_computetxtime(ah,
rt, IEEE80211_ACK_SIZE, cix, shortPreamble);
}
} else
ctsrate = 0;
/*
* For now use the antenna on which the last good
* frame was received on. We assume this field is
* initialized to 0 which gives us ``auto'' or the
* ``default'' antenna.
*/
an = (struct ath_node *) ni;
if (an->an_tx_antenna)
antenna = an->an_tx_antenna;
else
antenna = an->an_rx_hist[an->an_rx_hist_next].arh_antenna;
/*
* Formulate first tx descriptor with tx controls.
*/
/* XXX check return value? */
ath_hal_setuptxdesc(ah, ds
, pktlen /* packet length */
, hdrlen /* header length */
, atype /* Atheros packet type */
, 60 /* txpower XXX */
, txrate, 1+10 /* series 0 rate/tries */
, iswep ? sc->sc_ic.ic_wep_txkey : HAL_TXKEYIX_INVALID
, antenna /* antenna mode */
, flags /* flags */
, ctsrate /* rts/cts rate */
, ctsduration /* rts/cts duration */
);
#ifdef notyet
ath_hal_setupxtxdesc(ah, ds
, AH_FALSE /* short preamble */
, 0, 0 /* series 1 rate/tries */
, 0, 0 /* series 2 rate/tries */
, 0, 0 /* series 3 rate/tries */
);
#endif
/*
* Fillin the remainder of the descriptor info.
*/
for (i = 0; i < bf->bf_nseg; i++, ds++) {
ds->ds_data = bf->bf_segs[i].ds_addr;
if (i == bf->bf_nseg - 1)
ds->ds_link = 0;
else
ds->ds_link = bf->bf_daddr + sizeof(*ds) * (i + 1);
ath_hal_filltxdesc(ah, ds
, bf->bf_segs[i].ds_len /* segment length */
, i == 0 /* first segment */
, i == bf->bf_nseg - 1 /* last segment */
);
DPRINTF2(("ath_tx_start: %d: %08x %08x %08x %08x %08x %08x\n",
i, ds->ds_link, ds->ds_data, ds->ds_ctl0, ds->ds_ctl1,
ds->ds_hw[0], ds->ds_hw[1]));
}
/*
* Insert the frame on the outbound list and
* pass it on to the hardware.
*/
ATH_TXQ_LOCK(sc);
TAILQ_INSERT_TAIL(&sc->sc_txq, bf, bf_list);
if (sc->sc_txlink == NULL) {
ath_hal_puttxbuf(ah, sc->sc_txhalq, bf->bf_daddr);
DPRINTF2(("ath_tx_start: TXDP0 = %p (%p)\n",
(caddr_t)bf->bf_daddr, bf->bf_desc));
} else {
*sc->sc_txlink = bf->bf_daddr;
DPRINTF2(("ath_tx_start: link(%p)=%p (%p)\n",
sc->sc_txlink, (caddr_t)bf->bf_daddr, bf->bf_desc));
}
sc->sc_txlink = &bf->bf_desc[bf->bf_nseg - 1].ds_link;
ATH_TXQ_UNLOCK(sc);
ath_hal_txstart(ah, sc->sc_txhalq);
return 0;
}
static void
ath_tx_proc(void *arg, int npending)
{
struct ath_softc *sc = arg;
struct ath_hal *ah = sc->sc_ah;
struct ath_buf *bf;
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = &ic->ic_if;
struct ath_desc *ds;
struct ieee80211_node *ni;
struct ath_node *an;
int sr, lr;
HAL_STATUS status;
DPRINTF2(("ath_tx_proc: pending %u tx queue %p, link %p\n",
npending, (caddr_t) ath_hal_gettxbuf(sc->sc_ah, sc->sc_txhalq),
sc->sc_txlink));
for (;;) {
ATH_TXQ_LOCK(sc);
bf = TAILQ_FIRST(&sc->sc_txq);
if (bf == NULL) {
sc->sc_txlink = NULL;
ATH_TXQ_UNLOCK(sc);
break;
}
/* only the last descriptor is needed */
ds = &bf->bf_desc[bf->bf_nseg - 1];
status = ath_hal_txprocdesc(ah, ds);
#ifdef AR_DEBUG
if (ath_debug > 1)
ath_printtxbuf(bf, status == HAL_OK);
#endif
if (status == HAL_EINPROGRESS) {
ATH_TXQ_UNLOCK(sc);
break;
}
TAILQ_REMOVE(&sc->sc_txq, bf, bf_list);
ATH_TXQ_UNLOCK(sc);
ni = bf->bf_node;
if (ni != NULL) {
an = (struct ath_node *) ni;
if (ds->ds_txstat.ts_status == 0) {
an->an_tx_ok++;
an->an_tx_antenna = ds->ds_txstat.ts_antenna;
} else {
an->an_tx_err++;
ifp->if_oerrors++;
if (ds->ds_txstat.ts_status & HAL_TXERR_XRETRY)
sc->sc_stats.ast_tx_xretries++;
if (ds->ds_txstat.ts_status & HAL_TXERR_FIFO)
sc->sc_stats.ast_tx_fifoerr++;
if (ds->ds_txstat.ts_status & HAL_TXERR_FILT)
sc->sc_stats.ast_tx_filtered++;
an->an_tx_antenna = 0; /* invalidate */
}
sr = ds->ds_txstat.ts_shortretry;
lr = ds->ds_txstat.ts_longretry;
sc->sc_stats.ast_tx_shortretry += sr;
sc->sc_stats.ast_tx_longretry += lr;
if (sr + lr)
an->an_tx_retr++;
/*
* Reclaim reference to node.
*
* NB: the node may be reclaimed here if, for example
* this is a DEAUTH message that was sent and the
* node was timed out due to inactivity.
*/
if (ni != ic->ic_bss)
ieee80211_free_node(ic, ni);
}
bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap);
m_freem(bf->bf_m);
bf->bf_m = NULL;
bf->bf_node = NULL;
ATH_TXBUF_LOCK(sc);
TAILQ_INSERT_TAIL(&sc->sc_txbuf, bf, bf_list);
ATH_TXBUF_UNLOCK(sc);
}
ifp->if_flags &= ~IFF_OACTIVE;
sc->sc_tx_timer = 0;
ath_start(ifp);
}
/*
* Drain the transmit queue and reclaim resources.
*/
static void
ath_draintxq(struct ath_softc *sc)
{
struct ath_hal *ah = sc->sc_ah;
struct ifnet *ifp = &sc->sc_ic.ic_if;
struct ath_buf *bf;
/* XXX return value */
if (!sc->sc_invalid) {
/* don't touch the hardware if marked invalid */
(void) ath_hal_stoptxdma(ah, sc->sc_txhalq);
DPRINTF(("ath_draintxq: tx queue %p, link %p\n",
(caddr_t) ath_hal_gettxbuf(ah, sc->sc_txhalq),
sc->sc_txlink));
(void) ath_hal_stoptxdma(ah, sc->sc_bhalq);
DPRINTF(("ath_draintxq: beacon queue %p\n",
(caddr_t) ath_hal_gettxbuf(ah, sc->sc_bhalq)));
}
for (;;) {
ATH_TXQ_LOCK(sc);
bf = TAILQ_FIRST(&sc->sc_txq);
if (bf == NULL) {
sc->sc_txlink = NULL;
ATH_TXQ_UNLOCK(sc);
break;
}
TAILQ_REMOVE(&sc->sc_txq, bf, bf_list);
ATH_TXQ_UNLOCK(sc);
#ifdef AR_DEBUG
if (ath_debug)
ath_printtxbuf(bf,
ath_hal_txprocdesc(ah, bf->bf_desc) == HAL_OK);
#endif /* AR_DEBUG */
bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap);
m_freem(bf->bf_m);
bf->bf_m = NULL;
bf->bf_node = NULL;
ATH_TXBUF_LOCK(sc);
TAILQ_INSERT_TAIL(&sc->sc_txbuf, bf, bf_list);
ATH_TXBUF_UNLOCK(sc);
}
ifp->if_flags &= ~IFF_OACTIVE;
sc->sc_tx_timer = 0;
}
/*
* Disable the receive h/w in preparation for a reset.
*/
static void
ath_stoprecv(struct ath_softc *sc)
{
#define PA2DESC(_sc, _pa) \
((struct ath_desc *)((caddr_t)(_sc)->sc_desc + \
((_pa) - (_sc)->sc_desc_paddr)))
struct ath_hal *ah = sc->sc_ah;
ath_hal_stoppcurecv(ah); /* disable PCU */
ath_hal_setrxfilter(ah, 0); /* clear recv filter */
ath_hal_stopdmarecv(ah); /* disable DMA engine */
DELAY(3000); /* long enough for 1 frame */
#ifdef AR_DEBUG
if (ath_debug) {
struct ath_buf *bf;
DPRINTF(("ath_stoprecv: rx queue %p, link %p\n",
(caddr_t) ath_hal_getrxbuf(ah), sc->sc_rxlink));
TAILQ_FOREACH(bf, &sc->sc_rxbuf, bf_list) {
struct ath_desc *ds = bf->bf_desc;
if (ath_hal_rxprocdesc(ah, ds, bf->bf_daddr,
PA2DESC(sc, ds->ds_link)) == HAL_OK)
ath_printrxbuf(bf, 1);
}
}
#endif
sc->sc_rxlink = NULL; /* just in case */
#undef PA2DESC
}
/*
* Enable the receive h/w following a reset.
*/
static int
ath_startrecv(struct ath_softc *sc)
{
struct ath_hal *ah = sc->sc_ah;
struct ath_buf *bf;
sc->sc_rxlink = NULL;
TAILQ_FOREACH(bf, &sc->sc_rxbuf, bf_list) {
int error = ath_rxbuf_init(sc, bf);
if (error != 0) {
DPRINTF(("ath_startrecv: ath_rxbuf_init failed %d\n",
error));
return error;
}
}
bf = TAILQ_FIRST(&sc->sc_rxbuf);
ath_hal_putrxbuf(ah, bf->bf_daddr);
ath_hal_rxena(ah); /* enable recv descriptors */
ath_mode_init(sc); /* set filters, etc. */
ath_hal_startpcurecv(ah); /* re-enable PCU/DMA engine */
return 0;
}
/*
* Set/change channels. If the channel is really being changed,
* it's done by resetting the chip. To accomplish this we must
* first cleanup any pending DMA, then restart stuff after a la
* ath_init.
*/
static int
ath_chan_set(struct ath_softc *sc, struct ieee80211_channel *chan)
{
struct ath_hal *ah = sc->sc_ah;
struct ieee80211com *ic = &sc->sc_ic;
DPRINTF(("ath_chan_set: %u (%u MHz) -> %u (%u MHz)\n",
ieee80211_chan2ieee(ic, ic->ic_ibss_chan),
ic->ic_ibss_chan->ic_freq,
ieee80211_chan2ieee(ic, chan), chan->ic_freq));
if (chan != ic->ic_ibss_chan) {
HAL_STATUS status;
HAL_CHANNEL hchan;
enum ieee80211_phymode mode;
/*
* To switch channels clear any pending DMA operations;
* wait long enough for the RX fifo to drain, reset the
* hardware at the new frequency, and then re-enable
* the relevant bits of the h/w.
*/
ath_hal_intrset(ah, 0); /* disable interrupts */
ath_draintxq(sc); /* clear pending tx frames */
ath_stoprecv(sc); /* turn off frame recv */
/*
* Convert to a HAL channel description with
* the flags constrained to reflect the current
* operating mode.
*/
hchan.channel = chan->ic_freq;
hchan.channelFlags = ath_chan2flags(ic, chan);
if (!ath_hal_reset(ah, ic->ic_opmode, &hchan, AH_TRUE, &status)) {
if_printf(&ic->ic_if, "ath_chan_set: unable to reset "
"channel %u (%u Mhz)\n",
ieee80211_chan2ieee(ic, chan), chan->ic_freq);
return EIO;
}
/*
* Re-enable rx framework.
*/
if (ath_startrecv(sc) != 0) {
if_printf(&ic->ic_if,
"ath_chan_set: unable to restart recv logic\n");
return EIO;
}
/*
* Update BPF state.
*/
sc->sc_tx_th.wt_chan_freq = sc->sc_rx_th.wr_chan_freq =
htole16(chan->ic_freq);
sc->sc_tx_th.wt_chan_flags = sc->sc_rx_th.wr_chan_flags =
htole16(chan->ic_flags);
/*
* Change channels and update the h/w rate map
* if we're switching; e.g. 11a to 11b/g.
*/
ic->ic_ibss_chan = chan;
mode = ieee80211_chan2mode(ic, chan);
if (mode != sc->sc_curmode)
ath_setcurmode(sc, mode);
/*
* Re-enable interrupts.
*/
ath_hal_intrset(ah, sc->sc_imask);
}
return 0;
}
static void
ath_next_scan(void *arg)
{
struct ath_softc *sc = arg;
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = &ic->ic_if;
if (ic->ic_state == IEEE80211_S_SCAN)
ieee80211_next_scan(ifp);
}
/*
* Periodically recalibrate the PHY to account
* for temperature/environment changes.
*/
static void
ath_calibrate(void *arg)
{
struct ath_softc *sc = arg;
struct ath_hal *ah = sc->sc_ah;
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211_channel *c;
HAL_CHANNEL hchan;
sc->sc_stats.ast_per_cal++;
/*
* Convert to a HAL channel description with the flags
* constrained to reflect the current operating mode.
*/
c = ic->ic_ibss_chan;
hchan.channel = c->ic_freq;
hchan.channelFlags = ath_chan2flags(ic, c);
DPRINTF(("%s: channel %u/%x\n", __func__, c->ic_freq, c->ic_flags));
if (ath_hal_getrfgain(ah) == HAL_RFGAIN_NEED_CHANGE) {
/*
* Rfgain is out of bounds, reset the chip
* to load new gain values.
*/
sc->sc_stats.ast_per_rfgain++;
ath_reset(sc);
}
if (!ath_hal_calibrate(ah, &hchan)) {
DPRINTF(("%s: calibration of channel %u failed\n",
__func__, c->ic_freq));
sc->sc_stats.ast_per_calfail++;
}
callout_reset(&sc->sc_cal_ch, hz * ath_calinterval, ath_calibrate, sc);
}
static int
ath_newstate(struct ieee80211com *ic, enum ieee80211_state nstate, int arg)
{
struct ifnet *ifp = &ic->ic_if;
struct ath_softc *sc = ifp->if_softc;
struct ath_hal *ah = sc->sc_ah;
struct ieee80211_node *ni;
int i, error;
const u_int8_t *bssid;
u_int32_t rfilt;
static const HAL_LED_STATE leds[] = {
HAL_LED_INIT, /* IEEE80211_S_INIT */
HAL_LED_SCAN, /* IEEE80211_S_SCAN */
HAL_LED_AUTH, /* IEEE80211_S_AUTH */
HAL_LED_ASSOC, /* IEEE80211_S_ASSOC */
HAL_LED_RUN, /* IEEE80211_S_RUN */
};
DPRINTF(("%s: %s -> %s\n", __func__,
ieee80211_state_name[ic->ic_state],
ieee80211_state_name[nstate]));
ath_hal_setledstate(ah, leds[nstate]); /* set LED */
if (nstate == IEEE80211_S_INIT) {
sc->sc_imask &= ~(HAL_INT_SWBA | HAL_INT_BMISS);
ath_hal_intrset(ah, sc->sc_imask);
callout_stop(&sc->sc_scan_ch);
callout_stop(&sc->sc_cal_ch);
return (*sc->sc_newstate)(ic, nstate, arg);
}
ni = ic->ic_bss;
error = ath_chan_set(sc, ni->ni_chan);
if (error != 0)
goto bad;
rfilt = ath_calcrxfilter(sc);
if (nstate == IEEE80211_S_SCAN) {
callout_reset(&sc->sc_scan_ch, (hz * ath_dwelltime) / 1000,
ath_next_scan, sc);
bssid = ifp->if_broadcastaddr;
} else {
callout_stop(&sc->sc_scan_ch);
bssid = ni->ni_bssid;
}
ath_hal_setrxfilter(ah, rfilt);
DPRINTF(("%s: RX filter 0x%x bssid %s\n",
__func__, rfilt, ether_sprintf(bssid)));
if (nstate == IEEE80211_S_RUN && ic->ic_opmode == IEEE80211_M_STA)
ath_hal_setassocid(ah, bssid, ni->ni_associd);
else
ath_hal_setassocid(ah, bssid, 0);
if (ic->ic_flags & IEEE80211_F_WEPON) {
for (i = 0; i < IEEE80211_WEP_NKID; i++)
if (ath_hal_keyisvalid(ah, i))
ath_hal_keysetmac(ah, i, bssid);
}
if (nstate == IEEE80211_S_RUN) {
DPRINTF(("%s(RUN): ic_flags=0x%08x iv=%d bssid=%s "
"capinfo=0x%04x chan=%d\n"
, __func__
, ic->ic_flags
, ni->ni_intval
, ether_sprintf(ni->ni_bssid)
, ni->ni_capinfo
, ieee80211_chan2ieee(ic, ni->ni_chan)));
/*
* Allocate and setup the beacon frame for AP or adhoc mode.
*/
if (ic->ic_opmode == IEEE80211_M_HOSTAP ||
ic->ic_opmode == IEEE80211_M_IBSS) {
error = ath_beacon_alloc(sc, ni);
if (error != 0)
goto bad;
}
/*
* Configure the beacon and sleep timers.
*/
ath_beacon_config(sc);
/* start periodic recalibration timer */
callout_reset(&sc->sc_cal_ch, hz * ath_calinterval,
ath_calibrate, sc);
} else {
sc->sc_imask &= ~(HAL_INT_SWBA | HAL_INT_BMISS);
ath_hal_intrset(ah, sc->sc_imask);
callout_stop(&sc->sc_cal_ch); /* no calibration */
}
/*
* Reset the rate control state.
*/
ath_rate_ctl_reset(sc, nstate);
/*
* Invoke the parent method to complete the work.
*/
return (*sc->sc_newstate)(ic, nstate, arg);
bad:
callout_stop(&sc->sc_scan_ch);
callout_stop(&sc->sc_cal_ch);
/* NB: do not invoke the parent */
return error;
}
/*
* Setup driver-specific state for a newly associated node.
* Note that we're called also on a re-associate, the isnew
* param tells us if this is the first time or not.
*/
static void
ath_newassoc(struct ieee80211com *ic, struct ieee80211_node *ni, int isnew)
{
if (isnew) {
struct ath_node *an = (struct ath_node *) ni;
an->an_tx_ok = an->an_tx_err =
an->an_tx_retr = an->an_tx_upper = 0;
/* start with highest negotiated rate */
/*
* XXX should do otherwise but only when
* the rate control algorithm is better.
*/
KASSERT(ni->ni_rates.rs_nrates > 0,
("new association w/ no rates!"));
ni->ni_txrate = ni->ni_rates.rs_nrates - 1;
}
}
static int
ath_getchannels(struct ath_softc *sc, u_int cc, HAL_BOOL outdoor)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = &ic->ic_if;
struct ath_hal *ah = sc->sc_ah;
HAL_CHANNEL *chans;
int i, ix, nchan;
chans = malloc(IEEE80211_CHAN_MAX * sizeof(HAL_CHANNEL),
M_TEMP, M_NOWAIT);
if (chans == NULL) {
if_printf(ifp, "unable to allocate channel table\n");
return ENOMEM;
}
if (!ath_hal_init_channels(ah, chans, IEEE80211_CHAN_MAX, &nchan,
cc, HAL_MODE_ALL, outdoor)) {
if_printf(ifp, "unable to collect channel list from hal\n");
free(chans, M_TEMP);
return EINVAL;
}
/*
* Convert HAL channels to ieee80211 ones and insert
* them in the table according to their channel number.
*/
for (i = 0; i < nchan; i++) {
HAL_CHANNEL *c = &chans[i];
ix = ath_hal_mhz2ieee(c->channel, c->channelFlags);
if (ix > IEEE80211_CHAN_MAX) {
if_printf(ifp, "bad hal channel %u (%u/%x) ignored\n",
ix, c->channel, c->channelFlags);
continue;
}
/* NB: flags are known to be compatible */
if (ic->ic_channels[ix].ic_freq == 0) {
ic->ic_channels[ix].ic_freq = c->channel;
ic->ic_channels[ix].ic_flags = c->channelFlags;
} else {
/* channels overlap; e.g. 11g and 11b */
ic->ic_channels[ix].ic_flags |= c->channelFlags;
}
}
free(chans, M_TEMP);
return 0;
}
static int
ath_rate_setup(struct ath_softc *sc, u_int mode)
{
struct ath_hal *ah = sc->sc_ah;
struct ieee80211com *ic = &sc->sc_ic;
const HAL_RATE_TABLE *rt;
struct ieee80211_rateset *rs;
int i, maxrates;
switch (mode) {
case IEEE80211_MODE_11A:
sc->sc_rates[mode] = ath_hal_getratetable(ah, HAL_MODE_11A);
break;
case IEEE80211_MODE_11B:
sc->sc_rates[mode] = ath_hal_getratetable(ah, HAL_MODE_11B);
break;
case IEEE80211_MODE_11G:
sc->sc_rates[mode] = ath_hal_getratetable(ah, HAL_MODE_11G);
break;
case IEEE80211_MODE_TURBO:
sc->sc_rates[mode] = ath_hal_getratetable(ah, HAL_MODE_TURBO);
break;
default:
DPRINTF(("%s: invalid mode %u\n", __func__, mode));
return 0;
}
rt = sc->sc_rates[mode];
if (rt == NULL)
return 0;
if (rt->rateCount > IEEE80211_RATE_MAXSIZE) {
DPRINTF(("%s: rate table too small (%u > %u)\n",
__func__, rt->rateCount, IEEE80211_RATE_MAXSIZE));
maxrates = IEEE80211_RATE_MAXSIZE;
} else
maxrates = rt->rateCount;
rs = &ic->ic_sup_rates[mode];
for (i = 0; i < maxrates; i++)
rs->rs_rates[i] = rt->info[i].dot11Rate;
rs->rs_nrates = maxrates;
return 1;
}
static void
ath_setcurmode(struct ath_softc *sc, enum ieee80211_phymode mode)
{
const HAL_RATE_TABLE *rt;
int i;
memset(sc->sc_rixmap, 0xff, sizeof(sc->sc_rixmap));
rt = sc->sc_rates[mode];
KASSERT(rt != NULL, ("no h/w rate set for phy mode %u", mode));
for (i = 0; i < rt->rateCount; i++)
sc->sc_rixmap[rt->info[i].dot11Rate & IEEE80211_RATE_VAL] = i;
memset(sc->sc_hwmap, 0, sizeof(sc->sc_hwmap));
for (i = 0; i < 32; i++)
sc->sc_hwmap[i] = rt->info[rt->rateCodeToIndex[i]].dot11Rate;
sc->sc_currates = rt;
sc->sc_curmode = mode;
}
/*
* Reset the rate control state for each 802.11 state transition.
*/
static void
ath_rate_ctl_reset(struct ath_softc *sc, enum ieee80211_state state)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211_node *ni;
struct ath_node *an;
if (ic->ic_opmode != IEEE80211_M_STA) {
/*
* When operating as a station the node table holds
* the AP's that were discovered during scanning.
* For any other operating mode we want to reset the
* tx rate state of each node.
*/
TAILQ_FOREACH(ni, &ic->ic_node, ni_list) {
ni->ni_txrate = 0; /* use lowest rate */
an = (struct ath_node *) ni;
an->an_tx_ok = an->an_tx_err = an->an_tx_retr =
an->an_tx_upper = 0;
}
}
/*
* Reset local xmit state; this is really only meaningful
* when operating in station or adhoc mode.
*/
ni = ic->ic_bss;
an = (struct ath_node *) ni;
an->an_tx_ok = an->an_tx_err = an->an_tx_retr = an->an_tx_upper = 0;
if (state == IEEE80211_S_RUN) {
/* start with highest negotiated rate */
KASSERT(ni->ni_rates.rs_nrates > 0,
("transition to RUN state w/ no rates!"));
ni->ni_txrate = ni->ni_rates.rs_nrates - 1;
} else {
/* use lowest rate */
ni->ni_txrate = 0;
}
}
/*
* Examine and potentially adjust the transmit rate.
*/
static void
ath_rate_ctl(void *arg, struct ieee80211_node *ni)
{
struct ath_softc *sc = arg;
struct ath_node *an = (struct ath_node *) ni;
struct ieee80211_rateset *rs = &ni->ni_rates;
int mod = 0, orate, enough;
/*
* Rate control
* XXX: very primitive version.
*/
sc->sc_stats.ast_rate_calls++;
enough = (an->an_tx_ok + an->an_tx_err >= 10);
/* no packet reached -> down */
if (an->an_tx_err > 0 && an->an_tx_ok == 0)
mod = -1;
/* all packets needs retry in average -> down */
if (enough && an->an_tx_ok < an->an_tx_retr)
mod = -1;
/* no error and less than 10% of packets needs retry -> up */
if (enough && an->an_tx_err == 0 && an->an_tx_ok > an->an_tx_retr * 10)
mod = 1;
orate = ni->ni_txrate;
switch (mod) {
case 0:
if (enough && an->an_tx_upper > 0)
an->an_tx_upper--;
break;
case -1:
if (ni->ni_txrate > 0) {
ni->ni_txrate--;
sc->sc_stats.ast_rate_drop++;
}
an->an_tx_upper = 0;
break;
case 1:
if (++an->an_tx_upper < 2)
break;
an->an_tx_upper = 0;
if (ni->ni_txrate + 1 < rs->rs_nrates) {
ni->ni_txrate++;
sc->sc_stats.ast_rate_raise++;
}
break;
}
if (ni->ni_txrate != orate) {
DPRINTF(("%s: %dM -> %dM (%d ok, %d err, %d retr)\n",
__func__,
(rs->rs_rates[orate] & IEEE80211_RATE_VAL) / 2,
(rs->rs_rates[ni->ni_txrate] & IEEE80211_RATE_VAL) / 2,
an->an_tx_ok, an->an_tx_err, an->an_tx_retr));
}
if (ni->ni_txrate != orate || enough)
an->an_tx_ok = an->an_tx_err = an->an_tx_retr = 0;
}
#ifdef AR_DEBUG
static int
sysctl_hw_ath_dump(SYSCTL_HANDLER_ARGS)
{
char dmode[64];
int error;
strncpy(dmode, "", sizeof(dmode) - 1);
dmode[sizeof(dmode) - 1] = '\0';
error = sysctl_handle_string(oidp, &dmode[0], sizeof(dmode), req);
if (error == 0 && req->newptr != NULL) {
struct ifnet *ifp;
struct ath_softc *sc;
ifp = ifunit("ath0"); /* XXX */
if (!ifp)
return EINVAL;
sc = ifp->if_softc;
if (strcmp(dmode, "hal") == 0)
ath_hal_dumpstate(sc->sc_ah);
else
return EINVAL;
}
return error;
}
SYSCTL_PROC(_hw_ath, OID_AUTO, dump, CTLTYPE_STRING | CTLFLAG_RW,
0, 0, sysctl_hw_ath_dump, "A", "Dump driver state");
static void
ath_printrxbuf(struct ath_buf *bf, int done)
{
struct ath_desc *ds;
int i;
for (i = 0, ds = bf->bf_desc; i < bf->bf_nseg; i++, ds++) {
printf("R%d (%p %p) %08x %08x %08x %08x %08x %08x %c\n",
i, ds, (struct ath_desc *)bf->bf_daddr + i,
ds->ds_link, ds->ds_data,
ds->ds_ctl0, ds->ds_ctl1,
ds->ds_hw[0], ds->ds_hw[1],
!done ? ' ' : (ds->ds_rxstat.rs_status == 0) ? '*' : '!');
}
}
static void
ath_printtxbuf(struct ath_buf *bf, int done)
{
struct ath_desc *ds;
int i;
for (i = 0, ds = bf->bf_desc; i < bf->bf_nseg; i++, ds++) {
printf("T%d (%p %p) %08x %08x %08x %08x %08x %08x %08x %08x %c\n",
i, ds, (struct ath_desc *)bf->bf_daddr + i,
ds->ds_link, ds->ds_data,
ds->ds_ctl0, ds->ds_ctl1,
ds->ds_hw[0], ds->ds_hw[1], ds->ds_hw[2], ds->ds_hw[3],
!done ? ' ' : (ds->ds_txstat.ts_status == 0) ? '*' : '!');
}
}
#endif /* AR_DEBUG */
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