diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-05-28 08:12:19 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-28 21:11:45 +0300 |
| commit | 12abc5ee7873a085cc280240822b8ac53c86fecd (patch) | |
| tree | edd6a9fd7283c51007fd860b55ac1b210e9db135 /net/ipv4 | |
| parent | db10538a4b997a77a1fd561adaaa58afc7dcfa2f (diff) | |
| download | linux-12abc5ee7873a085cc280240822b8ac53c86fecd.tar.xz | |
tcp: add tcp_sock_set_nodelay
Add a helper to directly set the TCP_NODELAY sockopt from kernel space
without going through a fake uaccess. Cleanup the callers to avoid
pointless wrappers now that this is a simple function call.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Sagi Grimberg <sagi@grimberg.me>
Acked-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp.c | 39 |
1 files changed, 25 insertions, 14 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index e6cf702e16d6..a65f293a19fa 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2832,6 +2832,30 @@ void tcp_sock_set_cork(struct sock *sk, bool on) } EXPORT_SYMBOL(tcp_sock_set_cork); +/* TCP_NODELAY is weaker than TCP_CORK, so that this option on corked socket is + * remembered, but it is not activated until cork is cleared. + * + * However, when TCP_NODELAY is set we make an explicit push, which overrides + * even TCP_CORK for currently queued segments. + */ +static void __tcp_sock_set_nodelay(struct sock *sk, bool on) +{ + if (on) { + tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH; + tcp_push_pending_frames(sk); + } else { + tcp_sk(sk)->nonagle &= ~TCP_NAGLE_OFF; + } +} + +void tcp_sock_set_nodelay(struct sock *sk) +{ + lock_sock(sk); + __tcp_sock_set_nodelay(sk, true); + release_sock(sk); +} +EXPORT_SYMBOL(tcp_sock_set_nodelay); + /* * Socket option code for TCP. */ @@ -2929,20 +2953,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, break; case TCP_NODELAY: - if (val) { - /* TCP_NODELAY is weaker than TCP_CORK, so that - * this option on corked socket is remembered, but - * it is not activated until cork is cleared. - * - * However, when TCP_NODELAY is set we make - * an explicit push, which overrides even TCP_CORK - * for currently queued segments. - */ - tp->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH; - tcp_push_pending_frames(sk); - } else { - tp->nonagle &= ~TCP_NAGLE_OFF; - } + __tcp_sock_set_nodelay(sk, val); break; case TCP_THIN_LINEAR_TIMEOUTS: |