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udp: implement complete book-keeping for encap_needed

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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>
This commit is contained in:
Paolo Abeni 2018-11-07 12:38:28 +01:00 • committed by David S. Miller
parent 7e225619e8
commit 60fb9567bf
4 changed files with 34 additions and 12 deletions
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7
include/linux/udp.h
View file

@ -49,7 +49,12 @@ struct udp_sock {
unsigned int corkflag; /* Cork is required */
__u8 encap_type; /* Is this an Encapsulation socket? */
unsigned char no_check6_tx:1,/* Send zero UDP6 checksums on TX? */
no_check6_rx:1;/* Allow zero UDP6 checksums on RX? */
no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */
encap_enabled:1; /* This socket enabled encap
* processing; UDP tunnels and
* different encapsulation layer set
* this
*/
/*
* Following member retains the information to create a UDP header
* when the socket is uncorked.