Author: arybchik
Date: Wed Mar 25 10:23:00 2015
New Revision: 280518
URL: https://svnweb.freebsd.org/changeset/base/280518
Log:
MFC: 277894
sfxge: implemented parameter to restrict RSS channels
Submitted by: Artem V. Andreev <Artem.Andreev at oktetlabs.ru>
Sponsored by: Solarflare Communications, Inc.
Approved by: gnn (mentor)
Modified:
stable/10/share/man/man4/sfxge.4
stable/10/sys/dev/sfxge/sfxge.c
stable/10/sys/dev/sfxge/sfxge.h
stable/10/sys/dev/sfxge/sfxge_intr.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/share/man/man4/sfxge.4
==============================================================================
--- stable/10/share/man/man4/sfxge.4 Wed Mar 25 10:21:42 2015
(r280517)
+++ stable/10/share/man/man4/sfxge.4 Wed Mar 25 10:23:00 2015
(r280518)
@@ -108,6 +108,10 @@ If a packet is dropped, the
.Va tx_early_drops
counter is incremented and the local sender receives ENOBUFS.
The value must be greater than or equal to 0.
+.It Va hw.sfxge.N.max_rss_channels
+The maximum number of allocated RSS channels for the Nth adapter.
+If set to 0 or unset, the number of channels is determined by the number
+of CPU cores.
.El
.Sh SUPPORT
For general information and support,
Modified: stable/10/sys/dev/sfxge/sfxge.c
==============================================================================
--- stable/10/sys/dev/sfxge/sfxge.c Wed Mar 25 10:21:42 2015
(r280517)
+++ stable/10/sys/dev/sfxge/sfxge.c Wed Mar 25 10:23:00 2015
(r280518)
@@ -396,11 +396,18 @@ sfxge_create(struct sfxge_softc *sc)
device_t dev;
efx_nic_t *enp;
int error;
+ char rss_param_name[sizeof(SFXGE_PARAM(%d.max_rss_channels))];
dev = sc->dev;
sx_init(&sc->softc_lock, "sfxge_softc");
+ sc->max_rss_channels = 0;
+ snprintf(rss_param_name, sizeof(rss_param_name),
+ SFXGE_PARAM(%d.max_rss_channels),
+ (int)device_get_unit(dev));
+ TUNABLE_INT_FETCH(rss_param_name, &sc->max_rss_channels);
+
sc->stats_node = SYSCTL_ADD_NODE(
device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
Modified: stable/10/sys/dev/sfxge/sfxge.h
==============================================================================
--- stable/10/sys/dev/sfxge/sfxge.h Wed Mar 25 10:21:42 2015
(r280517)
+++ stable/10/sys/dev/sfxge/sfxge.h Wed Mar 25 10:23:00 2015
(r280518)
@@ -229,6 +229,7 @@ struct sfxge_softc {
uint64_t ev_stats[EV_NQSTATS];
#endif
+ unsigned int max_rss_channels;
uma_zone_t rxq_cache;
struct sfxge_rxq *rxq[SFXGE_RX_SCALE_MAX];
unsigned int rx_indir_table[SFXGE_RX_SCALE_MAX];
Modified: stable/10/sys/dev/sfxge/sfxge_intr.c
==============================================================================
--- stable/10/sys/dev/sfxge/sfxge_intr.c Wed Mar 25 10:21:42 2015
(r280517)
+++ stable/10/sys/dev/sfxge/sfxge_intr.c Wed Mar 25 10:23:00 2015
(r280518)
@@ -298,6 +298,9 @@ sfxge_intr_setup_msix(struct sfxge_softc
if (count > EFX_MAXRSS)
count = EFX_MAXRSS;
+ if (sc->max_rss_channels > 0 && count > sc->max_rss_channels)
+ count = sc->max_rss_channels;
+
rid = PCIR_BAR(4);
resp = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (resp == NULL)
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