smb: smbdirect: add smbdirect_socket.h

This abstracts the common smbdirect layer.

Currently with just a few things in it,
but that will change over time until everything is
in common.

Will be used in client and server in the next commits

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Cc: Meetakshi Setiya <meetakshisetiyaoss@gmail.com>
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/common/smbdirect/smbdirect_socket.h

@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *   Copyright (c) 2025 Stefan Metzmacher
+ */
+
+#ifndef __FS_SMB_COMMON_SMBDIRECT_SMBDIRECT_SOCKET_H__
+#define __FS_SMB_COMMON_SMBDIRECT_SMBDIRECT_SOCKET_H__
+
+enum smbdirect_socket_status {
+	SMBDIRECT_SOCKET_CREATED,
+	SMBDIRECT_SOCKET_CONNECTING,
+	SMBDIRECT_SOCKET_CONNECTED,
+	SMBDIRECT_SOCKET_NEGOTIATE_FAILED,
+	SMBDIRECT_SOCKET_DISCONNECTING,
+	SMBDIRECT_SOCKET_DISCONNECTED,
+	SMBDIRECT_SOCKET_DESTROYED
+};
+
+struct smbdirect_socket {
+	enum smbdirect_socket_status status;
+
+	/* RDMA related */
+	struct {
+		struct rdma_cm_id *cm_id;
+	} rdma;
+
+	/* IB verbs related */
+	struct {
+		struct ib_pd *pd;
+		struct ib_cq *send_cq;
+		struct ib_cq *recv_cq;
+
+		/*
+		 * shortcuts for rdma.cm_id->{qp,device};
+		 */
+		struct ib_qp *qp;
+		struct ib_device *dev;
+	} ib;
+};
+
+#endif /* __FS_SMB_COMMON_SMBDIRECT_SMBDIRECT_SOCKET_H__ */