mptcp: setsockopt: add SO_INCOMING_CPU

Replicate to all subflows.
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mptcp/sockopt.c

@@ -101,6 +101,9 @@ static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, in
 				sk_dst_reset(ssk);
 			}
 			break;
+		case SO_INCOMING_CPU:
+			WRITE_ONCE(ssk->sk_incoming_cpu, val);
+			break;
 		}
 
 		subflow->setsockopt_seq = msk->setsockopt_seq;
@@ -125,6 +128,15 @@ static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val)
 	return 0;
 }
 
+static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val)
+{
+	struct sock *sk = (struct sock *)msk;
+
+	WRITE_ONCE(sk->sk_incoming_cpu, val);
+
+	mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val);
+}
+
 static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname,
 					   sockptr_t optval, unsigned int optlen)
 {
@@ -145,6 +157,9 @@ static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname,
 	case SO_RCVBUF:
 	case SO_RCVBUFFORCE:
 		return mptcp_sol_socket_intval(msk, optname, val);
+	case SO_INCOMING_CPU:
+		mptcp_so_incoming_cpu(msk, val);
+		return 0;
 	}
 
 	return -ENOPROTOOPT;
@@ -230,6 +245,7 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
 	case SO_RCVBUF:
 	case SO_RCVBUFFORCE:
 	case SO_MARK:
+	case SO_INCOMING_CPU:
 		return mptcp_setsockopt_sol_socket_int(msk, optname, optval, optlen);
 	case SO_LINGER:
 		return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen);