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- Increase Early TX threshold if underrun occurred.

This commit is contained in:
kanaoka 2001-07-25 09:57:31 +00:00
parent a21ce80cd6
commit be5153a923
2 changed files with 30 additions and 3 deletions
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24
sys/dev/ic/rtl81x9.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: rtl81x9.c,v 1.35 2001/07/19 16:25:26 thorpej Exp $ */
/* $NetBSD: rtl81x9.c,v 1.36 2001/07/25 09:57:31 kanaoka Exp $ */
/*
* Copyright (c) 1997, 1998
@ -704,6 +704,9 @@ rtk_attach(sc)
*/
sc->sc_flags |= RTK_ATTACHED;
/* Init Early TX threshold. */
sc->sc_txthresh = TXTH_256;
/* Reset the adapter. */
rtk_reset(sc);
@ -1190,6 +1193,21 @@ STATIC void rtk_txeof(sc)
ifp->if_opackets++;
else {
ifp->if_oerrors++;
/*
* Increase Early TX threshold if underrun occurred.
* Increase step 64 bytes.
*/
if (txstat & RTK_TXSTAT_TX_UNDERRUN) {
printf("%s: transmit underrun;",
sc->sc_dev.dv_xname);
if (sc->sc_txthresh < TXTH_MAX) {
sc->sc_txthresh += 2;
printf(" new threshold: %d bytes",
sc->sc_txthresh * 32);
}
printf("\n");
}
if (txstat & (RTK_TXSTAT_TXABRT|RTK_TXSTAT_OUTOFWIN))
CSR_WRITE_4(sc, RTK_TXCFG, RTK_TXCFG_CONFIG);
}
@ -1334,7 +1352,7 @@ STATIC void rtk_start(ifp)
CSR_WRITE_4(sc, txd->txd_txaddr,
txd->txd_dmamap->dm_segs[0].ds_addr);
CSR_WRITE_4(sc, txd->txd_txstat, RTK_TX_EARLYTHRESH | len);
CSR_WRITE_4(sc, txd->txd_txstat, RTK_TX_THRESH(sc) | len);
}
/*
@ -1379,6 +1397,8 @@ STATIC int rtk_init(ifp)
/* Init TX descriptors. */
rtk_list_tx_init(sc);
/* Init Early TX threshold. */
sc->sc_txthresh = TXTH_256;
/*
* Enable transmit and receive.
*/

9
sys/dev/ic/rtl81x9var.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: rtl81x9var.h,v 1.9 2001/02/02 04:34:19 thorpej Exp $ */
/* $NetBSD: rtl81x9var.h,v 1.10 2001/07/25 09:57:31 kanaoka Exp $ */
/*
* Copyright (c) 1997, 1998
@ -92,6 +92,8 @@ struct rtk_softc {
SIMPLEQ_HEAD(, rtk_tx_desc) rtk_tx_dirty;
int sc_flags; /* misc flags */
int sc_txthresh; /* Early tx threshold */
void *sc_sdhook; /* shutdown hook */
void *sc_powerhook; /* power management hook */
@ -105,6 +107,11 @@ struct rtk_softc {
#define RTK_ENABLED 0x00000002 /* chip is enabled */
#define RTK_IS_ENABLED(sc) ((sc)->sc_flags & RTK_ENABLED)
#define RTK_TX_THRESH(sc) (((sc)->sc_txthresh << 16) & 0x003F0000)
#define TXTH_256 8
#define TXTH_MAX 48
/*
* register space access macros
*/