Merge branch 'mptcp-updates-for-net-next'

Mat Martineau says:

====================
mptcp: Updates for net-next

Three independent fixes/features from the MPTCP tree:

Patch 1 is a selftest workaround for older iproute2 packages.

Patch 2 removes superfluous locks that were added with recent MP_FAIL
patches.

Patch 3 adds support for the TCP_DEFER_ACCEPT sockopt.
====================

Link: https://lore.kernel.org/r/20220514002115.725976-1-mathew.j.martineau@linux.intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/mptcp/protocol.c

@@ -1613,10 +1613,8 @@ void __mptcp_push_pending(struct sock *sk, unsigned int flags)
 
 out:
 	/* ensure the rtx timer is running */
-	mptcp_data_lock(sk);
 	if (!mptcp_timer_pending(sk))
 		mptcp_reset_timer(sk);
-	mptcp_data_unlock(sk);
 	if (copied)
 		__mptcp_check_send_data_fin(sk);
 }
@@ -2529,10 +2527,8 @@ static void __mptcp_retrans(struct sock *sk)
 reset_timer:
 	mptcp_check_and_set_pending(sk);
 
-	mptcp_data_lock(sk);
 	if (!mptcp_timer_pending(sk))
 		mptcp_reset_timer(sk);
-	mptcp_data_unlock(sk);
 }
 
 static void mptcp_mp_fail_no_response(struct mptcp_sock *msk)
@@ -2711,10 +2707,8 @@ void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how)
 		} else {
 			pr_debug("Sending DATA_FIN on subflow %p", ssk);
 			tcp_send_ack(ssk);
-			mptcp_data_lock(sk);
 			if (!mptcp_timer_pending(sk))
 				mptcp_reset_timer(sk);
-			mptcp_data_unlock(sk);
 		}
 		break;
 	}
@@ -2815,10 +2809,8 @@ static void __mptcp_destroy_sock(struct sock *sk)
 	/* join list will be eventually flushed (with rst) at sock lock release time*/
 	list_splice_init(&msk->conn_list, &conn_list);
 
-	mptcp_data_lock(sk);
 	mptcp_stop_timer(sk);
 	sk_stop_timer(sk, &sk->sk_timer);
-	mptcp_data_unlock(sk);
 	msk->pm.status = 0;
 
 	/* clears msk->subflow, allowing the following loop to close
@@ -2880,9 +2872,7 @@ static void mptcp_close(struct sock *sk, long timeout)
 		__mptcp_destroy_sock(sk);
 		do_cancel_work = true;
 	} else {
-		mptcp_data_lock(sk);
 		sk_reset_timer(sk, &sk->sk_timer, jiffies + TCP_TIMEWAIT_LEN);
-		mptcp_data_unlock(sk);
 	}
 	release_sock(sk);
 	if (do_cancel_work)
@@ -2927,10 +2917,8 @@ static int mptcp_disconnect(struct sock *sk, int flags)
 		__mptcp_close_ssk(sk, ssk, subflow, MPTCP_CF_FASTCLOSE);
 	}
 
-	mptcp_data_lock(sk);
 	mptcp_stop_timer(sk);
 	sk_stop_timer(sk, &sk->sk_timer);
-	mptcp_data_unlock(sk);
 
 	if (mptcp_sk(sk)->token)
 		mptcp_event(MPTCP_EVENT_CLOSED, mptcp_sk(sk), NULL, GFP_KERNEL);

net/mptcp/sockopt.c

@@ -756,6 +756,18 @@ 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_sol_tcp(struct mptcp_sock *msk, int optname,
 				    sockptr_t optval, unsigned int optlen)
 {
@@ -782,6 +794,8 @@ static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
 		return mptcp_setsockopt_sol_tcp_cork(msk, optval, optlen);
 	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);
 	}
 
 	return -EOPNOTSUPP;
@@ -1142,6 +1156,7 @@ static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
 	case TCP_CONGESTION:
 	case TCP_INFO:
 	case TCP_CC_INFO:
+	case TCP_DEFER_ACCEPT:
 		return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname,
 						      optval, optlen);
 	case TCP_INQ:

tools/testing/selftests/net/mptcp/mptcp_join.sh

@@ -2693,6 +2693,7 @@ fastclose_tests()
 pedit_action_pkts()
 {
 	tc -n $ns2 -j -s action show action pedit index 100 | \
+		grep "packets" | \
 		sed 's/.*"packets":\([0-9]\+\),.*/\1/'
 }