smb: client/smbdirect: introduce SMBDIRECT_SOCKET_ERROR

This will be used to turn SMBDIRECT_SOCKET_CONNECTED into an
error within smbd_disconnect_rdma_connection() on the client
and smb_direct_disconnect_rdma_connection() on the server.

We do this in a single commit with the client as otherwise it
won't build because the enum value is not handled in the
switch statement.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: metze-samba

fs/smb/client/smbdirect.c

@@ -166,6 +166,7 @@ static void smbd_disconnect_rdma_work(struct work_struct *work)
 	case SMBDIRECT_SOCKET_NEGOTIATE_RUNNING:
 	case SMBDIRECT_SOCKET_NEGOTIATE_FAILED:
 	case SMBDIRECT_SOCKET_CONNECTED:
+	case SMBDIRECT_SOCKET_ERROR:
 		sc->status = SMBDIRECT_SOCKET_DISCONNECTING;
 		rdma_disconnect(sc->rdma.cm_id);
 		break;

fs/smb/common/smbdirect/smbdirect_socket.h

@@ -23,6 +23,7 @@ enum smbdirect_socket_status {
 	SMBDIRECT_SOCKET_NEGOTIATE_RUNNING,
 	SMBDIRECT_SOCKET_NEGOTIATE_FAILED,
 	SMBDIRECT_SOCKET_CONNECTED,
+	SMBDIRECT_SOCKET_ERROR,
 	SMBDIRECT_SOCKET_DISCONNECTING,
 	SMBDIRECT_SOCKET_DISCONNECTED,
 	SMBDIRECT_SOCKET_DESTROYED
@@ -60,6 +61,8 @@ const char *smbdirect_socket_status_string(enum smbdirect_socket_status status)
 		return "NEGOTIATE_FAILED";
 	case SMBDIRECT_SOCKET_CONNECTED:
 		return "CONNECTED";
+	case SMBDIRECT_SOCKET_ERROR:
+		return "ERROR";
 	case SMBDIRECT_SOCKET_DISCONNECTING:
 		return "DISCONNECTING";
 	case SMBDIRECT_SOCKET_DISCONNECTED: