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