freebsd-skq/sys/dev/ath/if_ath_tx.c
adrian 178df47a18 Add in HT protection but disable it by default.
I'll clear how it's supposed to work with Bernhard and then look
at enabling this in the correct situations.

But this -does- enable HT RTS protection (using the appropriate legacy
rates) if this bit of code is enabled.
2011-03-28 11:48:49 +00:00

1125 lines
32 KiB
C

/*-
* Copyright (c) 2002-2009 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.
*
* 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 "opt_ath.h"
#include "opt_wlan.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 <sys/kthread.h>
#include <sys/taskqueue.h>
#include <sys/priv.h>
#include <machine/bus.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_llc.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_regdomain.h>
#ifdef IEEE80211_SUPPORT_SUPERG
#include <net80211/ieee80211_superg.h>
#endif
#ifdef IEEE80211_SUPPORT_TDMA
#include <net80211/ieee80211_tdma.h>
#endif
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#include <dev/ath/if_athvar.h>
#include <dev/ath/ath_hal/ah_devid.h> /* XXX for softled */
#include <dev/ath/ath_hal/ah_diagcodes.h>
#include <dev/ath/if_ath_debug.h>
#ifdef ATH_TX99_DIAG
#include <dev/ath/ath_tx99/ath_tx99.h>
#endif
#include <dev/ath/if_ath_misc.h>
#include <dev/ath/if_ath_tx.h>
#include <dev/ath/if_ath_tx_ht.h>
/*
* Whether to use the 11n rate scenario functions or not
*/
static inline int
ath_tx_is_11n(struct ath_softc *sc)
{
return (sc->sc_ah->ah_magic == 0x20065416);
}
void
ath_txfrag_cleanup(struct ath_softc *sc,
ath_bufhead *frags, struct ieee80211_node *ni)
{
struct ath_buf *bf, *next;
ATH_TXBUF_LOCK_ASSERT(sc);
STAILQ_FOREACH_SAFE(bf, frags, bf_list, next) {
/* NB: bf assumed clean */
STAILQ_REMOVE_HEAD(frags, bf_list);
STAILQ_INSERT_HEAD(&sc->sc_txbuf, bf, bf_list);
ieee80211_node_decref(ni);
}
}
/*
* Setup xmit of a fragmented frame. Allocate a buffer
* for each frag and bump the node reference count to
* reflect the held reference to be setup by ath_tx_start.
*/
int
ath_txfrag_setup(struct ath_softc *sc, ath_bufhead *frags,
struct mbuf *m0, struct ieee80211_node *ni)
{
struct mbuf *m;
struct ath_buf *bf;
ATH_TXBUF_LOCK(sc);
for (m = m0->m_nextpkt; m != NULL; m = m->m_nextpkt) {
bf = _ath_getbuf_locked(sc);
if (bf == NULL) { /* out of buffers, cleanup */
ath_txfrag_cleanup(sc, frags, ni);
break;
}
ieee80211_node_incref(ni);
STAILQ_INSERT_TAIL(frags, bf, bf_list);
}
ATH_TXBUF_UNLOCK(sc);
return !STAILQ_EMPTY(frags);
}
/*
* Reclaim mbuf resources. For fragmented frames we
* need to claim each frag chained with m_nextpkt.
*/
void
ath_freetx(struct mbuf *m)
{
struct mbuf *next;
do {
next = m->m_nextpkt;
m->m_nextpkt = NULL;
m_freem(m);
} while ((m = next) != NULL);
}
static int
ath_tx_dmasetup(struct ath_softc *sc, struct ath_buf *bf, struct mbuf *m0)
{
struct mbuf *m;
int error;
/*
* Load the DMA map so any coalescing is done. This
* also calculates the number of descriptors we need.
*/
error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
bf->bf_segs, &bf->bf_nseg,
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++;
ath_freetx(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++;
m = m_collapse(m0, M_DONTWAIT, ATH_TXDESC);
if (m == NULL) {
ath_freetx(m0);
sc->sc_stats.ast_tx_nombuf++;
return ENOMEM;
}
m0 = m;
error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
bf->bf_segs, &bf->bf_nseg,
BUS_DMA_NOWAIT);
if (error != 0) {
sc->sc_stats.ast_tx_busdma++;
ath_freetx(m0);
return error;
}
KASSERT(bf->bf_nseg <= ATH_TXDESC,
("too many segments after defrag; nseg %u", bf->bf_nseg));
} else if (bf->bf_nseg == 0) { /* null packet, discard */
sc->sc_stats.ast_tx_nodata++;
ath_freetx(m0);
return EIO;
}
DPRINTF(sc, ATH_DEBUG_XMIT, "%s: m %p len %u\n",
__func__, m0, m0->m_pkthdr.len);
bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
bf->bf_m = m0;
return 0;
}
static void
ath_tx_chaindesclist(struct ath_softc *sc, struct ath_txq *txq, struct ath_buf *bf)
{
struct ath_hal *ah = sc->sc_ah;
struct ath_desc *ds, *ds0;
int i;
/*
* Fillin the remainder of the descriptor info.
*/
ds0 = ds = bf->bf_desc;
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 */
, ds0 /* first descriptor */
);
DPRINTF(sc, ATH_DEBUG_XMIT,
"%s: %d: %08x %08x %08x %08x %08x %08x\n",
__func__, i, ds->ds_link, ds->ds_data,
ds->ds_ctl0, ds->ds_ctl1, ds->ds_hw[0], ds->ds_hw[1]);
}
}
static void
ath_tx_handoff(struct ath_softc *sc, struct ath_txq *txq, struct ath_buf *bf)
{
struct ath_hal *ah = sc->sc_ah;
/* Fill in the details in the descriptor list */
ath_tx_chaindesclist(sc, txq, bf);
/*
* Insert the frame on the outbound list and pass it on
* to the hardware. Multicast frames buffered for power
* save stations and transmit from the CAB queue are stored
* on a s/w only queue and loaded on to the CAB queue in
* the SWBA handler since frames only go out on DTIM and
* to avoid possible races.
*/
ATH_TXQ_LOCK(txq);
KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
("busy status 0x%x", bf->bf_flags));
if (txq->axq_qnum != ATH_TXQ_SWQ) {
#ifdef IEEE80211_SUPPORT_TDMA
int qbusy;
ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
qbusy = ath_hal_txqenabled(ah, txq->axq_qnum);
if (txq->axq_link == NULL) {
/*
* Be careful writing the address to TXDP. If
* the tx q is enabled then this write will be
* ignored. Normally this is not an issue but
* when tdma is in use and the q is beacon gated
* this race can occur. If the q is busy then
* defer the work to later--either when another
* packet comes along or when we prepare a beacon
* frame at SWBA.
*/
if (!qbusy) {
ath_hal_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
txq->axq_flags &= ~ATH_TXQ_PUTPENDING;
DPRINTF(sc, ATH_DEBUG_XMIT,
"%s: TXDP[%u] = %p (%p) depth %d\n",
__func__, txq->axq_qnum,
(caddr_t)bf->bf_daddr, bf->bf_desc,
txq->axq_depth);
} else {
txq->axq_flags |= ATH_TXQ_PUTPENDING;
DPRINTF(sc, ATH_DEBUG_TDMA | ATH_DEBUG_XMIT,
"%s: Q%u busy, defer enable\n", __func__,
txq->axq_qnum);
}
} else {
*txq->axq_link = bf->bf_daddr;
DPRINTF(sc, ATH_DEBUG_XMIT,
"%s: link[%u](%p)=%p (%p) depth %d\n", __func__,
txq->axq_qnum, txq->axq_link,
(caddr_t)bf->bf_daddr, bf->bf_desc, txq->axq_depth);
if ((txq->axq_flags & ATH_TXQ_PUTPENDING) && !qbusy) {
/*
* The q was busy when we previously tried
* to write the address of the first buffer
* in the chain. Since it's not busy now
* handle this chore. We are certain the
* buffer at the front is the right one since
* axq_link is NULL only when the buffer list
* is/was empty.
*/
ath_hal_puttxbuf(ah, txq->axq_qnum,
STAILQ_FIRST(&txq->axq_q)->bf_daddr);
txq->axq_flags &= ~ATH_TXQ_PUTPENDING;
DPRINTF(sc, ATH_DEBUG_TDMA | ATH_DEBUG_XMIT,
"%s: Q%u restarted\n", __func__,
txq->axq_qnum);
}
}
#else
ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
if (txq->axq_link == NULL) {
ath_hal_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
DPRINTF(sc, ATH_DEBUG_XMIT,
"%s: TXDP[%u] = %p (%p) depth %d\n",
__func__, txq->axq_qnum,
(caddr_t)bf->bf_daddr, bf->bf_desc,
txq->axq_depth);
} else {
*txq->axq_link = bf->bf_daddr;
DPRINTF(sc, ATH_DEBUG_XMIT,
"%s: link[%u](%p)=%p (%p) depth %d\n", __func__,
txq->axq_qnum, txq->axq_link,
(caddr_t)bf->bf_daddr, bf->bf_desc, txq->axq_depth);
}
#endif /* IEEE80211_SUPPORT_TDMA */
txq->axq_link = &bf->bf_desc[bf->bf_nseg - 1].ds_link;
ath_hal_txstart(ah, txq->axq_qnum);
} else {
if (txq->axq_link != NULL) {
struct ath_buf *last = ATH_TXQ_LAST(txq);
struct ieee80211_frame *wh;
/* mark previous frame */
wh = mtod(last->bf_m, struct ieee80211_frame *);
wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
bus_dmamap_sync(sc->sc_dmat, last->bf_dmamap,
BUS_DMASYNC_PREWRITE);
/* link descriptor */
*txq->axq_link = bf->bf_daddr;
}
ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
txq->axq_link = &bf->bf_desc[bf->bf_nseg - 1].ds_link;
}
ATH_TXQ_UNLOCK(txq);
}
static int
ath_tx_tag_crypto(struct ath_softc *sc, struct ieee80211_node *ni,
struct mbuf *m0, int iswep, int isfrag, int *hdrlen, int *pktlen, int *keyix)
{
if (iswep) {
const struct ieee80211_cipher *cip;
struct ieee80211_key *k;
/*
* Construct the 802.11 header+trailer for an encrypted
* frame. The only reason this can fail is because of an
* unknown or unsupported cipher/key type.
*/
k = ieee80211_crypto_encap(ni, m0);
if (k == NULL) {
/*
* This can happen when the key is yanked after the
* frame was queued. Just discard the frame; the
* 802.11 layer counts failures and provides
* debugging/diagnostics.
*/
return 0;
}
/*
* Adjust the packet + header lengths for the crypto
* additions and calculate the h/w key index. When
* a s/w mic is done the frame will have had any mic
* added to it prior to entry so m0->m_pkthdr.len will
* account for it. Otherwise we need to add it to the
* packet length.
*/
cip = k->wk_cipher;
(*hdrlen) += cip->ic_header;
(*pktlen) += cip->ic_header + cip->ic_trailer;
/* NB: frags always have any TKIP MIC done in s/w */
if ((k->wk_flags & IEEE80211_KEY_SWMIC) == 0 && !isfrag)
(*pktlen) += cip->ic_miclen;
(*keyix) = k->wk_keyix;
} else if (ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) {
/*
* Use station key cache slot, if assigned.
*/
(*keyix) = ni->ni_ucastkey.wk_keyix;
if ((*keyix) == IEEE80211_KEYIX_NONE)
(*keyix) = HAL_TXKEYIX_INVALID;
} else
(*keyix) = HAL_TXKEYIX_INVALID;
return 1;
}
static uint8_t
ath_tx_get_rtscts_rate(struct ath_hal *ah, const HAL_RATE_TABLE *rt,
int rix, int cix, int shortPreamble)
{
uint8_t ctsrate;
/*
* 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.
*/
/* NB: cix is set above where RTS/CTS is enabled */
KASSERT(cix != 0xff, ("cix not setup"));
ctsrate = rt->info[cix].rateCode;
/* XXX this should only matter for legacy rates */
if (shortPreamble)
ctsrate |= rt->info[cix].shortPreamble;
return ctsrate;
}
/*
* Calculate the RTS/CTS duration for legacy frames.
*/
static int
ath_tx_calc_ctsduration(struct ath_hal *ah, int rix, int cix,
int shortPreamble, int pktlen, const HAL_RATE_TABLE *rt,
int flags)
{
int ctsduration = 0;
/* This mustn't be called for HT modes */
if (rt->info[cix].phy == IEEE80211_T_HT) {
printf("%s: HT rate where it shouldn't be (0x%x)\n",
__func__, rt->info[cix].rateCode);
return -1;
}
/*
* Compute the transmit duration based on the frame
* size and 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.
*
* NB: CTS is assumed the same size as an ACK so we can
* use the precalculated ACK durations.
*/
if (shortPreamble) {
if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
ctsduration += rt->info[cix].spAckDuration;
ctsduration += ath_hal_computetxtime(ah,
rt, pktlen, rix, AH_TRUE);
if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
ctsduration += rt->info[rix].spAckDuration;
} else {
if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
ctsduration += rt->info[cix].lpAckDuration;
ctsduration += ath_hal_computetxtime(ah,
rt, pktlen, rix, AH_FALSE);
if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
ctsduration += rt->info[rix].lpAckDuration;
}
return ctsduration;
}
int
ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni, struct ath_buf *bf,
struct mbuf *m0)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ath_vap *avp = ATH_VAP(vap);
struct ath_hal *ah = sc->sc_ah;
struct ifnet *ifp = sc->sc_ifp;
struct ieee80211com *ic = ifp->if_l2com;
const struct chanAccParams *cap = &ic->ic_wme.wme_chanParams;
int error, iswep, ismcast, isfrag, ismrr;
int keyix, hdrlen, pktlen, try0;
u_int8_t rix, txrate, ctsrate;
u_int8_t cix = 0xff; /* NB: silence compiler */
struct ath_desc *ds;
struct ath_txq *txq;
struct ieee80211_frame *wh;
u_int subtype, flags, ctsduration;
HAL_PKT_TYPE atype;
const HAL_RATE_TABLE *rt;
HAL_BOOL shortPreamble;
struct ath_node *an;
u_int pri;
uint8_t try[4], rate[4];
bzero(try, sizeof(try));
bzero(rate, sizeof(rate));
wh = mtod(m0, struct ieee80211_frame *);
iswep = wh->i_fc[1] & IEEE80211_FC1_WEP;
ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
isfrag = m0->m_flags & M_FRAG;
hdrlen = ieee80211_anyhdrsize(wh);
/*
* Packet length must not include any
* pad bytes; deduct them here.
*/
pktlen = m0->m_pkthdr.len - (hdrlen & 3);
/* Handle encryption twiddling if needed */
if (! ath_tx_tag_crypto(sc, ni, m0, iswep, isfrag, &hdrlen, &pktlen, &keyix)) {
ath_freetx(m0);
return EIO;
}
/* packet header may have moved, reset our local pointer */
wh = mtod(m0, struct ieee80211_frame *);
pktlen += IEEE80211_CRC_LEN;
/*
* Load the DMA map so any coalescing is done. This
* also calculates the number of descriptors we need.
*/
error = ath_tx_dmasetup(sc, bf, m0);
if (error != 0)
return error;
bf->bf_node = ni; /* NB: held reference */
m0 = bf->bf_m; /* NB: may have changed */
wh = mtod(m0, struct ieee80211_frame *);
/* setup descriptors */
ds = bf->bf_desc;
rt = sc->sc_currates;
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
/*
* 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)) {
shortPreamble = AH_TRUE;
sc->sc_stats.ast_tx_shortpre++;
} else {
shortPreamble = AH_FALSE;
}
an = ATH_NODE(ni);
flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
ismrr = 0; /* default no multi-rate retry*/
pri = M_WME_GETAC(m0); /* honor classification */
/* XXX use txparams instead of fixed values */
/*
* Calculate Atheros packet type from IEEE80211 packet header,
* setup for rate calculations, and select h/w transmit queue.
*/
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;
else
atype = HAL_PKT_TYPE_NORMAL; /* XXX */
rix = an->an_mgmtrix;
txrate = rt->info[rix].rateCode;
if (shortPreamble)
txrate |= rt->info[rix].shortPreamble;
try0 = ATH_TXMGTTRY;
flags |= HAL_TXDESC_INTREQ; /* force interrupt */
break;
case IEEE80211_FC0_TYPE_CTL:
atype = HAL_PKT_TYPE_PSPOLL; /* stop setting of duration */
rix = an->an_mgmtrix;
txrate = rt->info[rix].rateCode;
if (shortPreamble)
txrate |= rt->info[rix].shortPreamble;
try0 = ATH_TXMGTTRY;
flags |= HAL_TXDESC_INTREQ; /* force interrupt */
break;
case IEEE80211_FC0_TYPE_DATA:
atype = HAL_PKT_TYPE_NORMAL; /* default */
/*
* Data frames: multicast frames go out at a fixed rate,
* EAPOL frames use the mgmt frame rate; otherwise consult
* the rate control module for the rate to use.
*/
if (ismcast) {
rix = an->an_mcastrix;
txrate = rt->info[rix].rateCode;
if (shortPreamble)
txrate |= rt->info[rix].shortPreamble;
try0 = 1;
} else if (m0->m_flags & M_EAPOL) {
/* XXX? maybe always use long preamble? */
rix = an->an_mgmtrix;
txrate = rt->info[rix].rateCode;
if (shortPreamble)
txrate |= rt->info[rix].shortPreamble;
try0 = ATH_TXMAXTRY; /* XXX?too many? */
} else {
ath_rate_findrate(sc, an, shortPreamble, pktlen,
&rix, &try0, &txrate);
sc->sc_txrix = rix; /* for LED blinking */
sc->sc_lastdatarix = rix; /* for fast frames */
if (try0 != ATH_TXMAXTRY)
ismrr = 1;
}
if (cap->cap_wmeParams[pri].wmep_noackPolicy)
flags |= HAL_TXDESC_NOACK;
break;
default:
if_printf(ifp, "bogus frame type 0x%x (%s)\n",
wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK, __func__);
/* XXX statistic */
ath_freetx(m0);
return EIO;
}
txq = sc->sc_ac2q[pri];
/*
* When servicing one or more stations in power-save mode
* (or) if there is some mcast data waiting on the mcast
* queue (to prevent out of order delivery) multicast
* frames must be buffered until after the beacon.
*/
if (ismcast && (vap->iv_ps_sta || avp->av_mcastq.axq_depth))
txq = &avp->av_mcastq;
/*
* Calculate miscellaneous flags.
*/
if (ismcast) {
flags |= HAL_TXDESC_NOACK; /* no ack on broad/multicast */
} else if (pktlen > vap->iv_rtsthreshold &&
(ni->ni_ath_flags & IEEE80211_NODE_FF) == 0) {
flags |= HAL_TXDESC_RTSENA; /* RTS based on frame length */
cix = rt->info[rix].controlRate;
sc->sc_stats.ast_tx_rts++;
}
if (flags & HAL_TXDESC_NOACK) /* NB: avoid double counting */
sc->sc_stats.ast_tx_noack++;
#ifdef IEEE80211_SUPPORT_TDMA
if (sc->sc_tdma && (flags & HAL_TXDESC_NOACK) == 0) {
DPRINTF(sc, ATH_DEBUG_TDMA,
"%s: discard frame, ACK required w/ TDMA\n", __func__);
sc->sc_stats.ast_tdma_ack++;
ath_freetx(m0);
return EIO;
}
#endif
/*
* If 802.11g protection is enabled, determine whether
* to use RTS/CTS or just CTS. Note that this is only
* done for OFDM unicast frames.
*/
if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
rt->info[rix].phy == IEEE80211_T_OFDM &&
(flags & HAL_TXDESC_NOACK) == 0) {
/* XXX fragments must use CCK rates w/ protection */
if (ic->ic_protmode == IEEE80211_PROT_RTSCTS)
flags |= HAL_TXDESC_RTSENA;
else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY)
flags |= HAL_TXDESC_CTSENA;
if (isfrag) {
/*
* For frags it would be desirable to use the
* highest CCK rate for RTS/CTS. But stations
* farther away may detect it at a lower CCK rate
* so use the configured protection rate instead
* (for now).
*/
cix = rt->info[sc->sc_protrix].controlRate;
} else
cix = rt->info[sc->sc_protrix].controlRate;
sc->sc_stats.ast_tx_protect++;
}
#if 0
/*
* If 11n protection is enabled and it's a HT frame,
* enable RTS.
*
* XXX ic_htprotmode or ic_curhtprotmode?
* XXX should it_htprotmode only matter if ic_curhtprotmode
* XXX indicates it's not a HT pure environment?
*/
if ((ic->ic_htprotmode == IEEE80211_PROT_RTSCTS) &&
rt->info[rix].phy == IEEE80211_T_HT &&
(flags & HAL_TXDESC_NOACK) == 0) {
cix = rt->info[sc->sc_protrix].controlRate;
flags |= HAL_TXDESC_RTSENA;
sc->sc_stats.ast_tx_htprotect++;
}
#endif
/*
* 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;
if (shortPreamble)
dur = rt->info[rix].spAckDuration;
else
dur = rt->info[rix].lpAckDuration;
if (wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG) {
dur += dur; /* additional SIFS+ACK */
KASSERT(m0->m_nextpkt != NULL, ("no fragment"));
/*
* Include the size of next fragment so NAV is
* updated properly. The last fragment uses only
* the ACK duration
*/
dur += ath_hal_computetxtime(ah, rt,
m0->m_nextpkt->m_pkthdr.len,
rix, shortPreamble);
}
if (isfrag) {
/*
* Force hardware to use computed duration for next
* fragment by disabling multi-rate retry which updates
* duration based on the multi-rate duration table.
*/
ismrr = 0;
try0 = ATH_TXMGTTRY; /* XXX? */
}
*(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)) {
ctsrate = ath_tx_get_rtscts_rate(ah, rt, rix, cix, shortPreamble);
/* The 11n chipsets do ctsduration calculations for you */
if (! ath_tx_is_11n(sc))
ctsduration = ath_tx_calc_ctsduration(ah, rix, cix, shortPreamble,
pktlen, rt, flags);
/*
* Must disable multi-rate retry when using RTS/CTS.
*/
ismrr = 0;
try0 = ATH_TXMGTTRY; /* XXX */
} else
ctsrate = 0;
/*
* At this point we are committed to sending the frame
* and we don't need to look at m_nextpkt; clear it in
* case this frame is part of frag chain.
*/
m0->m_nextpkt = NULL;
if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
ieee80211_dump_pkt(ic, mtod(m0, const uint8_t *), m0->m_len,
sc->sc_hwmap[rix].ieeerate, -1);
if (ieee80211_radiotap_active_vap(vap)) {
u_int64_t tsf = ath_hal_gettsf64(ah);
sc->sc_tx_th.wt_tsf = htole64(tsf);
sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
if (iswep)
sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
if (isfrag)
sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
sc->sc_tx_th.wt_txpower = ni->ni_txpower;
sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
ieee80211_radiotap_tx(vap, m0);
}
/*
* Determine if a tx interrupt should be generated for
* this descriptor. We take a tx interrupt to reap
* descriptors when the h/w hits an EOL condition or
* when the descriptor is specifically marked to generate
* an interrupt. We periodically mark descriptors in this
* way to insure timely replenishing of the supply needed
* for sending frames. Defering interrupts reduces system
* load and potentially allows more concurrent work to be
* done but if done to aggressively can cause senders to
* backup.
*
* NB: use >= to deal with sc_txintrperiod changing
* dynamically through sysctl.
*/
if (flags & HAL_TXDESC_INTREQ) {
txq->axq_intrcnt = 0;
} else if (++txq->axq_intrcnt >= sc->sc_txintrperiod) {
flags |= HAL_TXDESC_INTREQ;
txq->axq_intrcnt = 0;
}
if (ath_tx_is_11n(sc)) {
rate[0] = rix;
try[0] = try0;
}
/*
* Formulate first tx descriptor with tx controls.
*/
/* XXX check return value? */
/* XXX is this ok to call for 11n descriptors? */
/* XXX or should it go through the first, next, last 11n calls? */
ath_hal_setuptxdesc(ah, ds
, pktlen /* packet length */
, hdrlen /* header length */
, atype /* Atheros packet type */
, ni->ni_txpower /* txpower */
, txrate, try0 /* series 0 rate/tries */
, keyix /* key cache index */
, sc->sc_txantenna /* antenna mode */
, flags /* flags */
, ctsrate /* rts/cts rate */
, ctsduration /* rts/cts duration */
);
bf->bf_txflags = flags;
/*
* Setup the multi-rate retry state only when we're
* going to use it. This assumes ath_hal_setuptxdesc
* initializes the descriptors (so we don't have to)
* when the hardware supports multi-rate retry and
* we don't use it.
*/
if (ismrr) {
if (ath_tx_is_11n(sc))
ath_rate_getxtxrates(sc, an, rix, rate, try);
else
ath_rate_setupxtxdesc(sc, an, ds, shortPreamble, rix);
}
if (ath_tx_is_11n(sc)) {
ath_buf_set_rate(sc, ni, bf, pktlen, flags, ctsrate, (atype == HAL_PKT_TYPE_PSPOLL), rate, try);
}
ath_tx_handoff(sc, txq, bf);
return 0;
}
static int
ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
struct ath_buf *bf, struct mbuf *m0,
const struct ieee80211_bpf_params *params)
{
struct ifnet *ifp = sc->sc_ifp;
struct ieee80211com *ic = ifp->if_l2com;
struct ath_hal *ah = sc->sc_ah;
struct ieee80211vap *vap = ni->ni_vap;
int error, ismcast, ismrr;
int keyix, hdrlen, pktlen, try0, txantenna;
u_int8_t rix, cix, txrate, ctsrate, rate1, rate2, rate3;
struct ieee80211_frame *wh;
u_int flags, ctsduration;
HAL_PKT_TYPE atype;
const HAL_RATE_TABLE *rt;
struct ath_desc *ds;
u_int pri;
uint8_t try[4], rate[4];
bzero(try, sizeof(try));
bzero(rate, sizeof(rate));
wh = mtod(m0, struct ieee80211_frame *);
ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
hdrlen = ieee80211_anyhdrsize(wh);
/*
* Packet length must not include any
* pad bytes; deduct them here.
*/
/* XXX honor IEEE80211_BPF_DATAPAD */
pktlen = m0->m_pkthdr.len - (hdrlen & 3) + IEEE80211_CRC_LEN;
/* Handle encryption twiddling if needed */
if (! ath_tx_tag_crypto(sc, ni, m0, params->ibp_flags & IEEE80211_BPF_CRYPTO, 0, &hdrlen, &pktlen, &keyix)) {
ath_freetx(m0);
return EIO;
}
/* packet header may have moved, reset our local pointer */
wh = mtod(m0, struct ieee80211_frame *);
error = ath_tx_dmasetup(sc, bf, m0);
if (error != 0)
return error;
m0 = bf->bf_m; /* NB: may have changed */
wh = mtod(m0, struct ieee80211_frame *);
bf->bf_node = ni; /* NB: held reference */
flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
flags |= HAL_TXDESC_INTREQ; /* force interrupt */
if (params->ibp_flags & IEEE80211_BPF_RTS)
flags |= HAL_TXDESC_RTSENA;
else if (params->ibp_flags & IEEE80211_BPF_CTS)
flags |= HAL_TXDESC_CTSENA;
/* XXX leave ismcast to injector? */
if ((params->ibp_flags & IEEE80211_BPF_NOACK) || ismcast)
flags |= HAL_TXDESC_NOACK;
rt = sc->sc_currates;
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
rix = ath_tx_findrix(sc, params->ibp_rate0);
txrate = rt->info[rix].rateCode;
if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
txrate |= rt->info[rix].shortPreamble;
sc->sc_txrix = rix;
try0 = params->ibp_try0;
ismrr = (params->ibp_try1 != 0);
txantenna = params->ibp_pri >> 2;
if (txantenna == 0) /* XXX? */
txantenna = sc->sc_txantenna;
ctsduration = 0;
if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA)) {
cix = ath_tx_findrix(sc, params->ibp_ctsrate);
ctsrate = ath_tx_get_rtscts_rate(ah, rt, rix, cix, params->ibp_flags & IEEE80211_BPF_SHORTPRE);
/* The 11n chipsets do ctsduration calculations for you */
if (! ath_tx_is_11n(sc))
ctsduration = ath_tx_calc_ctsduration(ah, rix, cix,
params->ibp_flags & IEEE80211_BPF_SHORTPRE, pktlen,
rt, flags);
/*
* Must disable multi-rate retry when using RTS/CTS.
*/
ismrr = 0; /* XXX */
} else
ctsrate = 0;
pri = params->ibp_pri & 3;
/*
* NB: we mark all packets as type PSPOLL so the h/w won't
* set the sequence number, duration, etc.
*/
atype = HAL_PKT_TYPE_PSPOLL;
if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
ieee80211_dump_pkt(ic, mtod(m0, caddr_t), m0->m_len,
sc->sc_hwmap[rix].ieeerate, -1);
if (ieee80211_radiotap_active_vap(vap)) {
u_int64_t tsf = ath_hal_gettsf64(ah);
sc->sc_tx_th.wt_tsf = htole64(tsf);
sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
if (wh->i_fc[1] & IEEE80211_FC1_WEP)
sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
if (m0->m_flags & M_FRAG)
sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
sc->sc_tx_th.wt_txpower = ni->ni_txpower;
sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
ieee80211_radiotap_tx(vap, m0);
}
/*
* Formulate first tx descriptor with tx controls.
*/
ds = bf->bf_desc;
/* XXX check return value? */
ath_hal_setuptxdesc(ah, ds
, pktlen /* packet length */
, hdrlen /* header length */
, atype /* Atheros packet type */
, params->ibp_power /* txpower */
, txrate, try0 /* series 0 rate/tries */
, keyix /* key cache index */
, txantenna /* antenna mode */
, flags /* flags */
, ctsrate /* rts/cts rate */
, ctsduration /* rts/cts duration */
);
bf->bf_txflags = flags;
if (ath_tx_is_11n(sc)) {
rate[0] = ath_tx_findrix(sc, params->ibp_rate0);
try[0] = params->ibp_try0;
if (ismrr) {
/* Remember, rate[] is actually an array of rix's -adrian */
rate[0] = ath_tx_findrix(sc, params->ibp_rate0);
rate[1] = ath_tx_findrix(sc, params->ibp_rate1);
rate[2] = ath_tx_findrix(sc, params->ibp_rate2);
rate[3] = ath_tx_findrix(sc, params->ibp_rate3);
try[0] = params->ibp_try0;
try[1] = params->ibp_try1;
try[2] = params->ibp_try2;
try[3] = params->ibp_try3;
}
} else {
if (ismrr) {
rix = ath_tx_findrix(sc, params->ibp_rate1);
rate1 = rt->info[rix].rateCode;
if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
rate1 |= rt->info[rix].shortPreamble;
if (params->ibp_try2) {
rix = ath_tx_findrix(sc, params->ibp_rate2);
rate2 = rt->info[rix].rateCode;
if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
rate2 |= rt->info[rix].shortPreamble;
} else
rate2 = 0;
if (params->ibp_try3) {
rix = ath_tx_findrix(sc, params->ibp_rate3);
rate3 = rt->info[rix].rateCode;
if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
rate3 |= rt->info[rix].shortPreamble;
} else
rate3 = 0;
ath_hal_setupxtxdesc(ah, ds
, rate1, params->ibp_try1 /* series 1 */
, rate2, params->ibp_try2 /* series 2 */
, rate3, params->ibp_try3 /* series 3 */
);
}
}
if (ath_tx_is_11n(sc)) {
/*
* notice that rix doesn't include any of the "magic" flags txrate
* does for communicating "other stuff" to the HAL.
*/
ath_buf_set_rate(sc, ni, bf, pktlen, flags, ctsrate, (atype == HAL_PKT_TYPE_PSPOLL), rate, try);
}
/* NB: no buffered multicast in power save support */
ath_tx_handoff(sc, sc->sc_ac2q[pri], bf);
return 0;
}
int
ath_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
const struct ieee80211_bpf_params *params)
{
struct ieee80211com *ic = ni->ni_ic;
struct ifnet *ifp = ic->ic_ifp;
struct ath_softc *sc = ifp->if_softc;
struct ath_buf *bf;
int error;
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || sc->sc_invalid) {
DPRINTF(sc, ATH_DEBUG_XMIT, "%s: discard frame, %s", __func__,
(ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ?
"!running" : "invalid");
m_freem(m);
error = ENETDOWN;
goto bad;
}
/*
* Grab a TX buffer and associated resources.
*/
bf = ath_getbuf(sc);
if (bf == NULL) {
sc->sc_stats.ast_tx_nobuf++;
m_freem(m);
error = ENOBUFS;
goto bad;
}
if (params == NULL) {
/*
* Legacy path; interpret frame contents to decide
* precisely how to send the frame.
*/
if (ath_tx_start(sc, ni, bf, m)) {
error = EIO; /* XXX */
goto bad2;
}
} else {
/*
* Caller supplied explicit parameters to use in
* sending the frame.
*/
if (ath_tx_raw_start(sc, ni, bf, m, params)) {
error = EIO; /* XXX */
goto bad2;
}
}
sc->sc_wd_timer = 5;
ifp->if_opackets++;
sc->sc_stats.ast_tx_raw++;
return 0;
bad2:
ATH_TXBUF_LOCK(sc);
STAILQ_INSERT_HEAD(&sc->sc_txbuf, bf, bf_list);
ATH_TXBUF_UNLOCK(sc);
bad:
ifp->if_oerrors++;
sc->sc_stats.ast_tx_raw_fail++;
ieee80211_free_node(ni);
return error;
}