1 files changed, 76 insertions, 0 deletions
diff --git a/fs/smb/client/smbdirect.h b/fs/smb/client/smbdirect.h
new file mode 100644
index 000000000000..577d37dbeb8a
--- /dev/null
+++ b/fs/smb/client/smbdirect.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *   Copyright (C) 2017, Microsoft Corporation.
+ *
+ *   Author(s): Long Li <longli@microsoft.com>
+ */
+#ifndef _SMBDIRECT_H
+#define _SMBDIRECT_H
+
+#ifdef CONFIG_CIFS_SMB_DIRECT
+#define cifs_rdma_enabled(server)	((server)->rdma)
+
+#include "cifsglob.h"
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <linux/mempool.h>
+
+#include "../common/smbdirect/smbdirect.h"
+#include "../common/smbdirect/smbdirect_socket.h"
+
+extern int rdma_readwrite_threshold;
+extern int smbd_max_frmr_depth;
+extern int smbd_keep_alive_interval;
+extern int smbd_max_receive_size;
+extern int smbd_max_fragmented_recv_size;
+extern int smbd_max_send_size;
+extern int smbd_send_credit_target;
+extern int smbd_receive_credit_max;
+
+/*
+ * The context for the SMBDirect transport
+ * Everything related to the transport is here. It has several logical parts
+ * 1. RDMA related structures
+ * 2. SMBDirect connection parameters
+ * 3. Memory registrations
+ * 4. Receive and reassembly queues for data receive path
+ * 5. mempools for allocating packets
+ */
+struct smbd_connection {
+	struct smbdirect_socket socket;
+};
+
+/* Create a SMBDirect session */
+struct smbd_connection *smbd_get_connection(
+	struct TCP_Server_Info *server, struct sockaddr *dstaddr);
+
+const struct smbdirect_socket_parameters *smbd_get_parameters(struct smbd_connection *conn);
+
+/* Reconnect SMBDirect session */
+int smbd_reconnect(struct TCP_Server_Info *server);
+/* Destroy SMBDirect session */
+void smbd_destroy(struct TCP_Server_Info *server);
+
+/* Interface for carrying upper layer I/O through send/recv */
+int smbd_recv(struct smbd_connection *info, struct msghdr *msg);
+int smbd_send(struct TCP_Server_Info *server,
+	int num_rqst, struct smb_rqst *rqst);
+
+/* Interfaces to register and deregister MR for RDMA read/write */
+struct smbdirect_mr_io *smbd_register_mr(
+	struct smbd_connection *info, struct iov_iter *iter,
+	bool writing, bool need_invalidate);
+void smbd_deregister_mr(struct smbdirect_mr_io *mr);
+
+#else
+#define cifs_rdma_enabled(server)	0
+struct smbd_connection {};
+static inline void *smbd_get_connection(
+	struct TCP_Server_Info *server, struct sockaddr *dstaddr) {return NULL;}
+static inline int smbd_reconnect(struct TCP_Server_Info *server) {return -1; }
+static inline void smbd_destroy(struct TCP_Server_Info *server) {}
+static inline int smbd_recv(struct smbd_connection *info, struct msghdr *msg) {return -1; }
+static inline int smbd_send(struct TCP_Server_Info *server, int num_rqst, struct smb_rqst *rqst) {return -1; }
+#endif
+
+#endif