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ath9k: remove pointless sc_txintrperiod and spin_lock_bh on tx prepare

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sc_txintrperiod is currently set to 0 and never updated. We won't
be using this, if anything we will consider using TX interrupt
mitigation but that is different and not yet tested. So remove
sc_txintrperiod and the pointless spin_lock_bh() on tx prepare.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2008-10-22 13:28:43 -07:00 committed by John W. Linville
parent d9d2925713
commit b139a10a0a
3 changed files with 15 additions and 29 deletions
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13
drivers/net/wireless/ath9k/ath9k.h
View file

@ -138,6 +138,19 @@ struct ath_desc {
#define ATH9K_TXDESC_NOACK 0x0002
#define ATH9K_TXDESC_RTSENA 0x0004
#define ATH9K_TXDESC_CTSENA 0x0008
/* ATH9K_TXDESC_INTREQ forces a tx interrupt to be generated for
* the descriptor its marked on. 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 with this flag. Descriptors should be
* marked periodically 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. When the hardware queue is left too
* large rate control information may also be too out of
* date. An Alternative for this is TX interrupt mitigation
* but this needs more testing. */
#define ATH9K_TXDESC_INTREQ 0x0010
#define ATH9K_TXDESC_VEOL 0x0020
#define ATH9K_TXDESC_EXT_ONLY 0x0040

4
drivers/net/wireless/ath9k/core.h
View file

@ -443,9 +443,6 @@ struct ath_txq {
u8 axq_aggr_depth; /* aggregates queued */
u32 axq_totalqueued; /* total ever queued */
/* count to determine if descriptor should generate int on this txq. */
u32 axq_intrcnt;
bool stopped; /* Is mac80211 queue stopped ? */
struct ath_buf *axq_linkbuf; /* virtual addr of last buffer*/
@ -1007,7 +1004,6 @@ struct ath_softc {
struct ath_txq sc_txq[ATH9K_NUM_TX_QUEUES];
struct ath_descdma sc_txdma;
u32 sc_txqsetup;
u32 sc_txintrperiod; /* tx interrupt batching */
int sc_haltype2q[ATH9K_WME_AC_VO+1]; /* HAL WME AC -> h/w qnum */
u16 seq_no; /* TX sequence number */

27
drivers/net/wireless/ath9k/xmit.c
View file

@ -286,7 +286,8 @@ static int ath_tx_prepare(struct ath_softc *sc,
/* Fill flags */
txctl->flags |= ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */
txctl->flags |= ATH9K_TXDESC_CLRDMASK /* needed for crypto errors */
| ATH9K_TXDESC_INTREQ; /* Generate an interrupt */
if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
txctl->flags |= ATH9K_TXDESC_NOACK;
@ -363,28 +364,6 @@ static int ath_tx_prepare(struct ath_softc *sc,
rcs[0].tries = ATH_TXMAXTRY;
}
/*
* 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.
*/
spin_lock_bh(&txq->axq_lock);
if ((++txq->axq_intrcnt >= sc->sc_txintrperiod)) {
txctl->flags |= ATH9K_TXDESC_INTREQ;
txq->axq_intrcnt = 0;
}
spin_unlock_bh(&txq->axq_lock);
if (is_multicast_ether_addr(hdr->addr1)) {
antenna = sc->sc_mcastantenna + 1;
sc->sc_mcastantenna = (sc->sc_mcastantenna + 1) & 0x1;
@ -1166,7 +1145,6 @@ static int ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
nacked = 0;
for (;;) {
spin_lock_bh(&txq->axq_lock);
txq->axq_intrcnt = 0; /* reset periodic desc intr count */
if (list_empty(&txq->axq_q)) {
txq->axq_link = NULL;
txq->axq_linkbuf = NULL;
@ -2164,7 +2142,6 @@ struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
txq->axq_depth = 0;
txq->axq_aggr_depth = 0;
txq->axq_totalqueued = 0;
txq->axq_intrcnt = 0;
txq->axq_linkbuf = NULL;
sc->sc_txqsetup |= 1<<qnum;
}