net: sched: flower: handle concurrent mask insertion

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Without rtnl lock protection masks with same key can be inserted
concurrently. Insert temporary mask with reference count zero to masks
hashtable. This will cause any concurrent modifications to retry.

Wait for rcu grace period to complete after removing temporary mask from
masks hashtable to accommodate concurrent readers.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Suggested-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Vlad Buslov 2019-03-21 15:17:38 +02:00 • committed by David S. Miller

parent f48ef4d5b0

commit 195c234d15

1 changed files with 34 additions and 7 deletions

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net/sched/cls_flower.c

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