Author: arybchik
Date: Thu Jan 29 19:09:14 2015
New Revision: 277894
URL: https://svnweb.freebsd.org/changeset/base/277894
Log:
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:
head/share/man/man4/sfxge.4
head/sys/dev/sfxge/sfxge.c
head/sys/dev/sfxge/sfxge.h
head/sys/dev/sfxge/sfxge_intr.c
Modified: head/share/man/man4/sfxge.4
==============================================================================
--- head/share/man/man4/sfxge.4 Thu Jan 29 19:06:14 2015 (r277893)
+++ head/share/man/man4/sfxge.4 Thu Jan 29 19:09:14 2015 (r277894)
@@ -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: head/sys/dev/sfxge/sfxge.c
==============================================================================
--- head/sys/dev/sfxge/sfxge.c Thu Jan 29 19:06:14 2015 (r277893)
+++ head/sys/dev/sfxge/sfxge.c Thu Jan 29 19:09:14 2015 (r277894)
@@ -397,11 +397,18 @@ 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: head/sys/dev/sfxge/sfxge.h
==============================================================================
--- head/sys/dev/sfxge/sfxge.h Thu Jan 29 19:06:14 2015 (r277893)
+++ head/sys/dev/sfxge/sfxge.h Thu Jan 29 19:09:14 2015 (r277894)
@@ -230,6 +230,7 @@ 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: head/sys/dev/sfxge/sfxge_intr.c
==============================================================================
--- head/sys/dev/sfxge/sfxge_intr.c Thu Jan 29 19:06:14 2015
(r277893)
+++ head/sys/dev/sfxge/sfxge_intr.c Thu Jan 29 19:09:14 2015
(r277894)
@@ -302,6 +302,9 @@ 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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