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tcp: add tcp_sock_set_quickack

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Add a helper to directly set the TCP_QUICKACK 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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig
2020-05-28 07:12:20 +02:00
committed by David S. Miller
parent 12abc5ee78
commit ddd061b8da
4 changed files with 29 additions and 23 deletions
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39
net/ipv4/tcp.c
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@@ -2856,6 +2856,31 @@ void tcp_sock_set_nodelay(struct sock *sk)
}
EXPORT_SYMBOL(tcp_sock_set_nodelay);
static void __tcp_sock_set_quickack(struct sock *sk, int val)
{
if (!val) {
inet_csk_enter_pingpong_mode(sk);
return;
}
inet_csk_exit_pingpong_mode(sk);
if ((1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) &&
inet_csk_ack_scheduled(sk)) {
inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_PUSHED;
tcp_cleanup_rbuf(sk, 1);
if (!(val & 1))
inet_csk_enter_pingpong_mode(sk);
}
}
void tcp_sock_set_quickack(struct sock *sk, int val)
{
lock_sock(sk);
__tcp_sock_set_quickack(sk, val);
release_sock(sk);
}
EXPORT_SYMBOL(tcp_sock_set_quickack);
/*
* Socket option code for TCP.
*/
@@ -3096,19 +3121,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
break;
case TCP_QUICKACK:
if (!val) {
inet_csk_enter_pingpong_mode(sk);
} else {
inet_csk_exit_pingpong_mode(sk);
if ((1 << sk->sk_state) &
(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) &&
inet_csk_ack_scheduled(sk)) {
icsk->icsk_ack.pending |= ICSK_ACK_PUSHED;
tcp_cleanup_rbuf(sk, 1);
if (!(val & 1))
inet_csk_enter_pingpong_mode(sk);
}
}
__tcp_sock_set_quickack(sk, val);
break;
#ifdef CONFIG_TCP_MD5SIG