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Introduce a tunable that disables use of MSI.

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Non-zero value will use INTx.
This commit is contained in:
Pyun YongHyeon 2012-01-17 22:15:33 +00:00
parent 581f58e7a3
commit 5c952e8d1b
2 changed files with 10 additions and 0 deletions
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9
sys/dev/bge/if_bge.c
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@ -2745,6 +2745,9 @@ bge_can_use_msi(struct bge_softc *sc)
{
int can_use_msi = 0;
if (sc->bge_msi_disable != 0)
return (0);
/* Disable MSI for polling(4). */
#ifdef DEVICE_POLLING
return (0);
@ -5627,6 +5630,12 @@ bge_add_sysctls(struct bge_softc *sc)
"Number of fragmented TX buffers of a frame allowed before "
"forced collapsing");
sc->bge_msi_disable = 0;
snprintf(tn, sizeof(tn), "dev.bge.%d.msi_disable", unit);
TUNABLE_INT_FETCH(tn, &sc->bge_msi_disable);
SYSCTL_ADD_INT(ctx, children, OID_AUTO, "msi_disable",
CTLFLAG_RD, &sc->bge_msi_disable, 0, "Disable MSI");
/*
* It seems all Broadcom controllers have a bug that can generate UDP
* datagrams with checksum value 0 when TX UDP checksum offloading is

1
sys/dev/bge/if_bgereg.h
View File

@ -2864,6 +2864,7 @@ struct bge_softc {
int bge_timer;
int bge_forced_collapse;
int bge_forced_udpcsum;
int bge_msi_disable;
int bge_csum_features;
struct callout bge_stat_ch;
uint32_t bge_rx_discards;