tree 92197dd09800c0f4704f94bfd49ffe2d9a9d664e
parent 7e225619e8afc432fb054ef135f10c11cf8cfc85
author Paolo Abeni <pabeni@redhat.com> 1541590708 +0100
committer David S. Miller <davem@davemloft.net> 1541636584 -0800

udp: implement complete book-keeping for encap_needed

The *encap_needed static keys are enabled by UDP tunnels
and several UDP encapsulations type, but they are never
turned off. This can cause unneeded overall performance
degradation for systems where such features are used
transiently.

This patch introduces complete book-keeping for such keys,
decreasing the usage at socket destruction time, if needed,
and avoiding that the same socket could increase the key
usage multiple times.

rfc v3 -> v1:
 - add socket lock around udp_tunnel_encap_enable()

rfc v2 -> rfc v3:
 - use udp_tunnel_encap_enable() in setsockopt()

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>