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MFC: 277894

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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)
This commit is contained in:
arybchik 2015-03-25 10:23:00 +00:00
parent 9fb585d33c
commit 947d32c87f
4 changed files with 15 additions and 0 deletions
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4
share/man/man4/sfxge.4
View File

@ -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,

7
sys/dev/sfxge/sfxge.c
View File

@ -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)),

1
sys/dev/sfxge/sfxge.h
View File

@ -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];

3
sys/dev/sfxge/sfxge_intr.c
View File

@ -298,6 +298,9 @@ sfxge_intr_setup_msix(struct sfxge_softc *sc)
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)