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authorEric Dumazet <edumazet@google.com>2018-04-16 10:33:35 -0700
committerDavid S. Miller <davem@davemloft.net>2018-04-16 18:26:37 -0400
commitd1361840f8c519eaee9a78ffe09e4f0a1b586846 (patch)
tree86a904ade99a93544e0817cda7dc842b12f9b833 /net/core/sock.c
parenttc-testing: add sample action tests (diff)
downloadlinux-dev-d1361840f8c519eaee9a78ffe09e4f0a1b586846.tar.xz
linux-dev-d1361840f8c519eaee9a78ffe09e4f0a1b586846.zip
tcp: fix SO_RCVLOWAT and RCVBUF autotuning
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>
Diffstat (limited to 'net/core/sock.c')
-rw-r--r--net/core/sock.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index 6444525f610c..b2c3db169ca1 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -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: