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soreuseport: fast reuseport TCP socket selection

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This change extends the fast SO_REUSEPORT socket lookup implemented
for UDP to TCP.  Listener sockets with SO_REUSEPORT and the same
receive address are additionally added to an array for faster
random access.  This means that only a single socket from the group
must be found in the listener list before any socket in the group can
be used to receive a packet.  Previously, every socket in the group
needed to be considered before handing off the incoming packet.

This feature also exposes the ability to use a BPF program when
selecting a socket from a reuseport group.

Signed-off-by: Craig Gallek <kraig@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Craig Gallek 2016-02-10 11:50:40 -05:00 • committed by David S. Miller
parent fa46349767
commit c125e80b88
6 changed files with 93 additions and 12 deletions
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5
include/net/inet_hashtables.h
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@ -207,7 +207,10 @@ void inet_hashinfo_init(struct inet_hashinfo *h);
bool inet_ehash_insert(struct sock *sk, struct sock *osk);
bool inet_ehash_nolisten(struct sock *sk, struct sock *osk);
void __inet_hash(struct sock *sk, struct sock *osk);
int __inet_hash(struct sock *sk, struct sock *osk,
int (*saddr_same)(const struct sock *sk1,
const struct sock *sk2,
bool match_wildcard));
int inet_hash(struct sock *sk);
void inet_unhash(struct sock *sk);