mir/ovs
2
0
Fork 0
mirror of https://github.com/openvswitch/ovs synced 2025-08-31 22:35:15 +00:00
Code Issues Releases Wiki Activity

netdev-dpdk: Use LSC interrupt mode.

Browse Source 
Querying link status may get delayed for an undeterministic (long) time
with mlx5 ports. This is a consequence of the mlx5 driver calling ethtool
kernel API and getting stuck on the kernel RTNL lock while some other
operation is in progress under this lock.

One impact for long link status query is that it is called under the bond
lock taken in write mode periodically in bond_run().
In parallel, datapath threads may block requesting to read bonding related
info (like for example in bond_check_admissibility()).

The LSC interrupt mode is available with many DPDK drivers and is used by
default with testpmd.

It seems safe enough to switch on this feature by default in OVS.
We keep the per interface option to disable this feature in case of an
unforeseen bug.

Signed-off-by: David Marchand <david.marchand@redhat.com>
Reviewed-by: Robin Jarry <rjarry@redhat.com>
Acked-by: Mike Pattrick <mkp@redhat.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Kevin Traynor <ktraynor@redhat.com>
Acked-by: Aaron Conole <aconole@redhat.com>
This commit is contained in:
David Marchand
2024-06-19 18:00:55 +02:00
committed by Kevin Traynor
parent 6b09799f03
commit 2f196c80e7
4 changed files with 21 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
lib/netdev-dpdk.c
View File

@@ -2397,7 +2397,18 @@ netdev_dpdk_set_config(struct netdev *netdev, const struct smap *args,
}
}
lsc_interrupt_mode = smap_get_bool(args, "dpdk-lsc-interrupt", false);
lsc_interrupt_mode = smap_get_bool(args, "dpdk-lsc-interrupt", true);
if (lsc_interrupt_mode && !(*info.dev_flags & RTE_ETH_DEV_INTR_LSC)) {
if (smap_get(args, "dpdk-lsc-interrupt")) {
VLOG_WARN_BUF(errp, "'%s': link status interrupt is not "
"supported.", netdev_get_name(netdev));
err = EINVAL;
goto out;
}
VLOG_DBG("'%s': not enabling link status interrupt.",
netdev_get_name(netdev));
lsc_interrupt_mode = false;
}
if (dev->requested_lsc_interrupt_mode != lsc_interrupt_mode) {
dev->requested_lsc_interrupt_mode = lsc_interrupt_mode;
netdev_request_reconfigure(netdev);