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tcp: fix SO_RCVLOWAT and RCVBUF autotuning

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Applications might use SO_RCVLOWAT on TCP socket hoping to receive
one [E]POLLIN event only when a given amount of bytes are ready in socket
receive queue.

Problem is that receive autotuning is not aware of this constraint,
meaning sk_rcvbuf might be too small to allow all bytes to be stored.

Add a new (struct proto_ops)->set_rcvlowat method so that a protocol
can override the default setsockopt(SO_RCVLOWAT) behavior.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2018-04-16 10:33:35 -07:00 • committed by David S. Miller
parent 10b19aeac1
commit d1361840f8
6 changed files with 29 additions and 1 deletions
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5
net/core/sock.c
View file

@ -905,7 +905,10 @@ set_rcvbuf:
case SO_RCVLOWAT:
if (val < 0)
val = INT_MAX;
sk->sk_rcvlowat = val ? : 1;
if (sock->ops->set_rcvlowat)
ret = sock->ops->set_rcvlowat(sk, val);
else
sk->sk_rcvlowat = val ? : 1;
break;
case SO_RCVTIMEO: