mptcp: drop legacy code around RX EOF

Thanks to the previous patch -- "mptcp: consolidate fallback and non
fallback state machine" -- we can finally drop the "temporary hack"
used to detect rx eof.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 0 insertions, 49 deletions

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 27d206f7af62..a66ec341485e 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -894,49 +894,6 @@ bool mptcp_schedule_work(struct sock *sk)
 	return false;
 }
 
-void mptcp_subflow_eof(struct sock *sk)
-{
-	if (!test_and_set_bit(MPTCP_WORK_EOF, &mptcp_sk(sk)->flags))
-		mptcp_schedule_work(sk);
-}
-
-static void mptcp_check_for_eof(struct mptcp_sock *msk)
-{
-	struct mptcp_subflow_context *subflow;
-	struct sock *sk = (struct sock *)msk;
-	int receivers = 0;
-
-	mptcp_for_each_subflow(msk, subflow)
-		receivers += !subflow->rx_eof;
-	if (receivers)
-		return;
-
-	if (!(sk->sk_shutdown & RCV_SHUTDOWN)) {
-		/* hopefully temporary hack: propagate shutdown status
-		 * to msk, when all subflows agree on it
-		 */
-		WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | RCV_SHUTDOWN);
-
-		smp_mb__before_atomic(); /* SHUTDOWN must be visible first */
-		sk->sk_data_ready(sk);
-	}
-
-	switch (sk->sk_state) {
-	case TCP_ESTABLISHED:
-		inet_sk_state_store(sk, TCP_CLOSE_WAIT);
-		break;
-	case TCP_FIN_WAIT1:
-		inet_sk_state_store(sk, TCP_CLOSING);
-		break;
-	case TCP_FIN_WAIT2:
-		inet_sk_state_store(sk, TCP_CLOSE);
-		break;
-	default:
-		return;
-	}
-	mptcp_close_wake_up(sk);
-}
-
 static struct sock *mptcp_subflow_recv_lookup(const struct mptcp_sock *msk)
 {
 	struct mptcp_subflow_context *subflow;
@@ -2161,9 +2118,6 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 				break;
 			}
 
-			if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags))
-				mptcp_check_for_eof(msk);
-
 			if (sk->sk_shutdown & RCV_SHUTDOWN) {
 				/* race breaker: the shutdown could be after the
 				 * previous receive queue check
@@ -2681,9 +2635,6 @@ static void mptcp_worker(struct work_struct *work)
 
 	mptcp_pm_nl_work(msk);
 
-	if (test_and_clear_bit(MPTCP_WORK_EOF, &msk->flags))
-		mptcp_check_for_eof(msk);
-
 	mptcp_check_send_data_fin(sk);
 	mptcp_check_data_fin_ack(sk);
 	mptcp_check_data_fin(sk);