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 37 struct 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 55 void v9fs_register_trans(struct p9_trans_module *m); 56 void v9fs_unregister_trans(struct p9_trans_module *m); 57 struct p9_trans_module *v9fs_get_trans_by_name(const char *s); 58 struct p9_trans_module *v9fs_get_default_trans(void); 59 void 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 */ 65