Author: sbruno
Date: Tue Apr 4 21:03:34 2017
New Revision: 316502
URL: https://svnweb.freebsd.org/changeset/base/316502
Log:
Allow MSIX to be turned off by tuneable per interface, per driver.
Sponsored by: Limelight Networks
Modified:
head/sys/net/iflib.c
head/sys/net/iflib.h
Modified: head/sys/net/iflib.c
==============================================================================
--- head/sys/net/iflib.c Tue Apr 4 20:03:57 2017 (r316501)
+++ head/sys/net/iflib.c Tue Apr 4 21:03:34 2017 (r316502)
@@ -521,8 +521,6 @@ rxd_info_zero(if_rxd_info_t ri)
#define MAX_SINGLE_PACKET_FRACTION 12
#define IF_BAD_DMA (bus_addr_t)-1
-static int enable_msix = 1;
-
#define CTX_ACTIVE(ctx) ((if_getdrvflags((ctx)->ifc_ifp) & IFF_DRV_RUNNING))
#define CTX_LOCK_INIT(_sc, _name) mtx_init(&(_sc)->ifc_mtx, _name, "iflib ctx
lock", MTX_DEF)
@@ -5187,7 +5185,7 @@ iflib_msix_init(if_ctx_t ctx)
bar = ctx->ifc_softc_ctx.isc_msix_bar;
admincnt = sctx->isc_admin_intrcnt;
/* Override by tuneable */
- if (enable_msix == 0)
+ if (scctx->isc_disable_msix)
goto msi;
/*
@@ -5428,6 +5426,9 @@ iflib_add_device_sysctl_pre(if_ctx_t ctx
SYSCTL_ADD_U16(ctx_list, oid_list, OID_AUTO, "override_qs_enable",
CTLFLAG_RWTUN, &ctx->ifc_sysctl_qs_eq_override, 0,
"permit #txq != #rxq");
+ SYSCTL_ADD_INT(ctx_list, oid_list, OID_AUTO, "disable_msix",
+ CTLFLAG_RWTUN, &ctx->ifc_softc_ctx.isc_disable_msix, 0,
+ "disable MSIX (default 0)");
/* XXX change for per-queue sizes */
SYSCTL_ADD_PROC(ctx_list, oid_list, OID_AUTO, "override_ntxds",
Modified: head/sys/net/iflib.h
==============================================================================
--- head/sys/net/iflib.h Tue Apr 4 20:03:57 2017 (r316501)
+++ head/sys/net/iflib.h Tue Apr 4 21:03:34 2017 (r316502)
@@ -216,6 +216,7 @@ typedef struct if_softc_ctx {
iflib_intr_mode_t isc_intr;
uint16_t isc_max_frame_size; /* set at init time by driver */
pci_vendor_info_t isc_vendor_info; /* set by iflib prior to
attach_pre */
+ int isc_disable_msix;
if_txrx_t isc_txrx;
} *if_softc_ctx_t;
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