[PATCH mptcp] selftests: mptcp: make sendfile selftest work

[Florian Westphal <fw@strlen.de>]

When the selftest got added, sendfile() on mptcp sockets returned
-EOPNOTSUPP, so running 'mptcp_connect.sh -m sendfile' failed
immediately.

This is no longer the case, but the script fails anyway due to timeout.
Let the receiver know once the sender has sent all data, just like
with '-m mmap' mode.

Fixes: 048d19d444be ("mptcp: add basic kselftest for mptcp")
Signed-off-by: Florian Westphal <fw@strlen.de>
---
 tools/testing/selftests/net/mptcp/mptcp_connect.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.c b/tools/testing/selftests/net/mptcp/mptcp_connect.c
index e2ea6c126c99..6e429b88f911 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.c
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c
@@ -791,6 +791,9 @@ static int copyfd_io_sendfile(int infd, int peerfd, int outfd,
 		err = do_sendfile(infd, peerfd, size);
 		if (err)
 			return err;
+
+		shutdown(peerfd, SHUT_WR);
+
 		err = do_recvfile(peerfd, outfd);
 		*in_closed_after_out = true;
 	}
-- 
2.35.1