1 files changed, 69 insertions, 0 deletions
diff --git a/fs/ksmbd/transport_rdma.h b/fs/ksmbd/transport_rdma.h
new file mode 100644
index 000000000000..77aee4e5c9dc
--- /dev/null
+++ b/fs/ksmbd/transport_rdma.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *   Copyright (C) 2017, Microsoft Corporation.
+ *   Copyright (C) 2018, LG Electronics.
+ */
+
+#ifndef __KSMBD_TRANSPORT_RDMA_H__
+#define __KSMBD_TRANSPORT_RDMA_H__
+
+#define SMBD_DEFAULT_IOSIZE (8 * 1024 * 1024)
+#define SMBD_MIN_IOSIZE (512 * 1024)
+#define SMBD_MAX_IOSIZE (16 * 1024 * 1024)
+
+/* SMB DIRECT negotiation request packet [MS-SMBD] 2.2.1 */
+struct smb_direct_negotiate_req {
+	__le16 min_version;
+	__le16 max_version;
+	__le16 reserved;
+	__le16 credits_requested;
+	__le32 preferred_send_size;
+	__le32 max_receive_size;
+	__le32 max_fragmented_size;
+} __packed;
+
+/* SMB DIRECT negotiation response packet [MS-SMBD] 2.2.2 */
+struct smb_direct_negotiate_resp {
+	__le16 min_version;
+	__le16 max_version;
+	__le16 negotiated_version;
+	__le16 reserved;
+	__le16 credits_requested;
+	__le16 credits_granted;
+	__le32 status;
+	__le32 max_readwrite_size;
+	__le32 preferred_send_size;
+	__le32 max_receive_size;
+	__le32 max_fragmented_size;
+} __packed;
+
+#define SMB_DIRECT_RESPONSE_REQUESTED 0x0001
+
+/* SMB DIRECT data transfer packet with payload [MS-SMBD] 2.2.3 */
+struct smb_direct_data_transfer {
+	__le16 credits_requested;
+	__le16 credits_granted;
+	__le16 flags;
+	__le16 reserved;
+	__le32 remaining_data_length;
+	__le32 data_offset;
+	__le32 data_length;
+	__le32 padding;
+	__u8 buffer[];
+} __packed;
+
+#ifdef CONFIG_SMB_SERVER_SMBDIRECT
+int ksmbd_rdma_init(void);
+void ksmbd_rdma_destroy(void);
+bool ksmbd_rdma_capable_netdev(struct net_device *netdev);
+void init_smbd_max_io_size(unsigned int sz);
+unsigned int get_smbd_max_read_write_size(void);
+#else
+static inline int ksmbd_rdma_init(void) { return 0; }
+static inline int ksmbd_rdma_destroy(void) { return 0; }
+static inline bool ksmbd_rdma_capable_netdev(struct net_device *netdev) { return false; }
+static inline void init_smbd_max_io_size(unsigned int sz) { }
+static inline unsigned int get_smbd_max_read_write_size(void) { return 0; }
+#endif
+
+#endif /* __KSMBD_TRANSPORT_RDMA_H__ */