net: rps: change skb_flow_limit() hash function

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As explained in commit f3483c8e1d ("net: rfs: hash function change"),
masking low order bits of skb_get_hash(skb) has low entropy.

A NIC with 32 RX queues uses the 5 low order bits of rss key
to select a queue. This means all packets landing to a given
queue share the same 5 low order bits.

Switch to hash_32() to reduce hash collisions.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250407163602.170356-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Eric Dumazet 2025-04-07 16:35:59 +00:00 • committed by Jakub Kicinski

parent 34a07c5b25

commit c3025e94da

3 changed files with 3 additions and 3 deletions

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net/core/dev.c

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net/core/dev.h

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net/core/sysctl_net_core.c

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