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mptcp: refactor mptcp_stream_accept()

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Rewrite the mptcp socket accept op, leveraging the new
__inet_accept() helper.

This way we can avoid acquiring the new socket lock twice
and we can avoid a couple of indirect calls.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2023-05-17 12:16:15 -07:00 committed by Jakub Kicinski
parent 711bdd5141
commit e76c8ef5cc
1 changed files with 12 additions and 9 deletions
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21
net/mptcp/protocol.c
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@ -3747,6 +3747,7 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
{
struct mptcp_sock *msk = mptcp_sk(sock->sk);
struct socket *ssock;
struct sock *newsk;
int err;
pr_debug("msk=%p", msk);
@ -3758,17 +3759,20 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
if (!ssock)
return -EINVAL;
err = ssock->ops->accept(sock, newsock, flags, kern);
if (err == 0 && !mptcp_is_tcpsk(newsock->sk)) {
struct mptcp_sock *msk = mptcp_sk(newsock->sk);
newsk = mptcp_accept(sock->sk, flags, &err, kern);
if (!newsk)
return err;
lock_sock(newsk);
__inet_accept(sock, newsock, newsk);
if (!mptcp_is_tcpsk(newsock->sk)) {
struct mptcp_sock *msk = mptcp_sk(newsk);
struct mptcp_subflow_context *subflow;
struct sock *newsk = newsock->sk;
set_bit(SOCK_CUSTOM_SOCKOPT, &newsock->flags);
msk->in_accept_queue = 0;
lock_sock(newsk);
/* set ssk->sk_socket of accept()ed flows to mptcp socket.
* This is needed so NOSPACE flag can be set from tcp stack.
*/
@ -3789,11 +3793,10 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
if (unlikely(list_empty(&msk->conn_list)))
inet_sk_state_store(newsk, TCP_CLOSE);
}
release_sock(newsk);
}
release_sock(newsk);
return err;
return 0;
}
static __poll_t mptcp_check_writeable(struct mptcp_sock *msk)