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net: introduce default_rps_mask netns attribute

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If RPS is enabled, this allows configuring a default rps
mask, which is effective since receive queue creation time.

A default RPS mask allows the system admin to ensure proper
isolation, avoiding races at network namespace or device
creation time.

The default RPS mask is initially empty, and can be
modified via a newly added sysctl entry.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni
2023-02-07 19:44:57 +01:00
committed by Jakub Kicinski
parent 370ca718fd
commit 605cfa1b10
4 changed files with 50 additions and 1 deletions
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include/linux/netdevice.h
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@@ -223,6 +223,7 @@ struct net_device_core_stats {
#include <linux/static_key.h>
extern struct static_key_false rps_needed;
extern struct static_key_false rfs_needed;
extern struct cpumask rps_default_mask;
#endif
struct neighbour;