1 files changed, 69 insertions, 0 deletions
diff --git a/include/net/9p/transport.h b/include/net/9p/transport.h
new file mode 100644
index 000000000..766ec07c9
--- /dev/null
+++ b/include/net/9p/transport.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Transport Definition
+ *
+ *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
+ *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
+ */
+
+#ifndef NET_9P_TRANSPORT_H
+#define NET_9P_TRANSPORT_H
+
+#include <linux/module.h>
+
+#define P9_DEF_MIN_RESVPORT	(665U)
+#define P9_DEF_MAX_RESVPORT	(1023U)
+
+/**
+ * struct p9_trans_module - transport module interface
+ * @list: used to maintain a list of currently available transports
+ * @name: the human-readable name of the transport
+ * @maxsize: transport provided maximum packet size
+ * @pooled_rbuffers: currently only set for RDMA transport which pulls the
+ *                   response buffers from a shared pool, and accordingly
+ *                   we're less flexible when choosing the response message
+ *                   size in this case
+ * @def: set if this transport should be considered the default
+ * @create: member function to create a new connection on this transport
+ * @close: member function to discard a connection on this transport
+ * @request: member function to issue a request to the transport
+ * @cancel: member function to cancel a request (if it hasn't been sent)
+ * @cancelled: member function to notify that a cancelled request will not
+ *             receive a reply
+ *
+ * This is the basic API for a transport module which is registered by the
+ * transport module with the 9P core network module and used by the client
+ * to instantiate a new connection on a transport.
+ *
+ * The transport module list is protected by v9fs_trans_lock.
+ */
+
+struct p9_trans_module {
+	struct list_head list;
+	char *name;		/* name of transport */
+	int maxsize;		/* max message size of transport */
+	bool pooled_rbuffers;
+	int def;		/* this transport should be default */
+	struct module *owner;
+	int (*create)(struct p9_client *client,
+		      const char *devname, char *args);
+	void (*close)(struct p9_client *client);
+	int (*request)(struct p9_client *client, struct p9_req_t *req);
+	int (*cancel)(struct p9_client *client, struct p9_req_t *req);
+	int (*cancelled)(struct p9_client *client, struct p9_req_t *req);
+	int (*zc_request)(struct p9_client *client, struct p9_req_t *req,
+			  struct iov_iter *uidata, struct iov_iter *uodata,
+			  int inlen, int outlen, int in_hdr_len);
+	int (*show_options)(struct seq_file *m, struct p9_client *client);
+};
+
+void v9fs_register_trans(struct p9_trans_module *m);
+void v9fs_unregister_trans(struct p9_trans_module *m);
+struct p9_trans_module *v9fs_get_trans_by_name(const char *s);
+struct p9_trans_module *v9fs_get_default_trans(void);
+void v9fs_put_trans(struct p9_trans_module *m);
+
+#define MODULE_ALIAS_9P(transport) \
+	MODULE_ALIAS("9p-" transport)
+
+#endif /* NET_9P_TRANSPORT_H */