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 * @pooled_rbuffers: currently only set for RDMA transport which pulls the
23 * response buffers from a shared pool, and accordingly
24 * we're less flexible when choosing the response message
25 * size in this case
26 * @def: set if this transport should be considered the default
27 * @create: member function to create a new connection on this transport
28 * @close: member function to discard a connection on this transport
29 * @request: member function to issue a request to the transport
30 * @cancel: member function to cancel a request (if it hasn't been sent)
31 * @cancelled: member function to notify that a cancelled request will not
32 * receive a reply
33 *
34 * This is the basic API for a transport module which is registered by the
35 * transport module with the 9P core network module and used by the client
36 * to instantiate a new connection on a transport.
37 *
38 * The transport module list is protected by v9fs_trans_lock.
39 */
40
41 struct p9_trans_module {
42 struct list_head list;
43 char *name; /* name of transport */
44 int maxsize; /* max message size of transport */
45 bool pooled_rbuffers;
46 int def; /* this transport should be default */
47 struct module *owner;
48 int (*create)(struct p9_client *client,
49 const char *devname, char *args);
50 void (*close)(struct p9_client *client);
51 int (*request)(struct p9_client *client, struct p9_req_t *req);
52 int (*cancel)(struct p9_client *client, struct p9_req_t *req);
53 int (*cancelled)(struct p9_client *client, struct p9_req_t *req);
54 int (*zc_request)(struct p9_client *client, struct p9_req_t *req,
55 struct iov_iter *uidata, struct iov_iter *uodata,
56 int inlen, int outlen, int in_hdr_len);
57 int (*show_options)(struct seq_file *m, struct p9_client *client);
58 };
59
60 void v9fs_register_trans(struct p9_trans_module *m);
61 void v9fs_unregister_trans(struct p9_trans_module *m);
62 struct p9_trans_module *v9fs_get_trans_by_name(const char *s);
63 struct p9_trans_module *v9fs_get_default_trans(void);
64 void v9fs_put_trans(struct p9_trans_module *m);
65
66 #define MODULE_ALIAS_9P(transport) \
67 MODULE_ALIAS("9p-" transport)
68
69 #endif /* NET_9P_TRANSPORT_H */
70
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