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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Transport Definition
4 *
5 * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
6 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 */
8
9#ifndef NET_9P_TRANSPORT_H
10#define NET_9P_TRANSPORT_H
11
12#include <linux/module.h>
13
14#define P9_DEF_MIN_RESVPORT (665U)
15#define P9_DEF_MAX_RESVPORT (1023U)
16
17/**
18 * struct p9_trans_module - transport module interface
19 * @list: used to maintain a list of currently available transports
20 * @name: the human-readable name of the transport
21 * @maxsize: transport provided maximum packet size
22 * @def: set if this transport should be considered the default
23 * @create: member function to create a new connection on this transport
24 * @close: member function to discard a connection on this transport
25 * @request: member function to issue a request to the transport
26 * @cancel: member function to cancel a request (if it hasn't been sent)
27 * @cancelled: member function to notify that a cancelled request will not
28 * receive a reply
29 *
30 * This is the basic API for a transport module which is registered by the
31 * transport module with the 9P core network module and used by the client
32 * to instantiate a new connection on a transport.
33 *
34 * The transport module list is protected by v9fs_trans_lock.
35 */
36
37struct p9_trans_module {
38 struct list_head list;
39 char *name; /* name of transport */
40 int maxsize; /* max message size of transport */
41 int def; /* this transport should be default */
42 struct module *owner;
43 int (*create)(struct p9_client *client,
44 const char *devname, char *args);
45 void (*close)(struct p9_client *client);
46 int (*request)(struct p9_client *client, struct p9_req_t *req);
47 int (*cancel)(struct p9_client *client, struct p9_req_t *req);
48 int (*cancelled)(struct p9_client *client, struct p9_req_t *req);
49 int (*zc_request)(struct p9_client *client, struct p9_req_t *req,
50 struct iov_iter *uidata, struct iov_iter *uodata,
51 int inlen, int outlen, int in_hdr_len);
52 int (*show_options)(struct seq_file *m, struct p9_client *client);
53};
54
55void v9fs_register_trans(struct p9_trans_module *m);
56void v9fs_unregister_trans(struct p9_trans_module *m);
57struct p9_trans_module *v9fs_get_trans_by_name(char *s);
58struct p9_trans_module *v9fs_get_default_trans(void);
59void v9fs_put_trans(struct p9_trans_module *m);
60
61#define MODULE_ALIAS_9P(transport) \
62 MODULE_ALIAS("9p-" transport)
63
64#endif /* NET_9P_TRANSPORT_H */