netdev - [PATCH net-next 3/3] mptcp: sockopt: use new helper for TCP_DEFER

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Date:   Fri, 21 Oct 2022 17:45:05 -0700
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     netdev@...r.kernel.org
Cc:     Matthieu Baerts <matthieu.baerts@...sares.net>,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, mptcp@...ts.linux.dev,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 3/3] mptcp: sockopt: use new helper for TCP_DEFER_ACCEPT

From: Matthieu Baerts <matthieu.baerts@...sares.net>

mptcp_setsockopt_sol_tcp_defer() was doing the same thing as
mptcp_setsockopt_first_sf_only() except for the returned code in case of
error.

Ignoring the error is needed to mimic how TCP_DEFER_ACCEPT is handled
when used with "plain" TCP sockets.

The specific function for TCP_DEFER_ACCEPT can be replaced by the new
mptcp_setsockopt_first_sf_only() helper and errors can be ignored to
stay compatible with TCP. A bit of cleanup.

Suggested-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Acked-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
 net/mptcp/sockopt.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 1857281a0dd5..f85e9bbfe86f 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -758,18 +758,6 @@ static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname,
 	return -EOPNOTSUPP;
 }
 
-static int mptcp_setsockopt_sol_tcp_defer(struct mptcp_sock *msk, sockptr_t optval,
-					  unsigned int optlen)
-{
-	struct socket *listener;
-
-	listener = __mptcp_nmpc_socket(msk);
-	if (!listener)
-		return 0; /* TCP_DEFER_ACCEPT does not fail */
-
-	return tcp_setsockopt(listener->sk, SOL_TCP, TCP_DEFER_ACCEPT, optval, optlen);
-}
-
 static int mptcp_setsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname,
 					  sockptr_t optval, unsigned int optlen)
 {
@@ -810,7 +798,9 @@ static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
 	case TCP_NODELAY:
 		return mptcp_setsockopt_sol_tcp_nodelay(msk, optval, optlen);
 	case TCP_DEFER_ACCEPT:
-		return mptcp_setsockopt_sol_tcp_defer(msk, optval, optlen);
+		/* See tcp.c: TCP_DEFER_ACCEPT does not fail */
+		mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname, optval, optlen);
+		return 0;
 	case TCP_FASTOPEN_CONNECT:
 	case TCP_FASTOPEN_NO_COOKIE:
 		return mptcp_setsockopt_first_sf_only(msk, SOL_TCP, optname,
-- 
2.38.1