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 #define P9_FD_PORT 564 18 19 #define P9_RDMA_PORT 5640 20 #define P9_RDMA_SQ_DEPTH 32 21 #define P9_RDMA_RQ_DEPTH 32 22 #define P9_RDMA_TIMEOUT 30000 /* 30 seconds */ 23 24 /** 25 * struct p9_trans_module - transport module interface 26 * @list: used to maintain a list of currently available transports 27 * @name: the human-readable name of the transport 28 * @maxsize: transport provided maximum packet size 29 * @pooled_rbuffers: currently only set for RDMA transport which pulls the 30 * response buffers from a shared pool, and accordingly 31 * we're less flexible when choosing the response message 32 * size in this case 33 * @def: set if this transport should be considered the default 34 * @supports_vmalloc: set if this transport can work with vmalloc'd buffers 35 * (non-physically contiguous memory). Transports requiring 36 * DMA should leave this as false. 37 * @create: member function to create a new connection on this transport 38 * @close: member function to discard a connection on this transport 39 * @request: member function to issue a request to the transport 40 * @cancel: member function to cancel a request (if it hasn't been sent) 41 * @cancelled: member function to notify that a cancelled request will not 42 * receive a reply 43 * 44 * This is the basic API for a transport module which is registered by the 45 * transport module with the 9P core network module and used by the client 46 * to instantiate a new connection on a transport. 47 * 48 * The transport module list is protected by v9fs_trans_lock. 49 */ 50 51 struct p9_trans_module { 52 struct list_head list; 53 char *name; /* name of transport */ 54 int maxsize; /* max message size of transport */ 55 bool pooled_rbuffers; 56 bool def; /* this transport should be default */ 57 bool supports_vmalloc; /* can work with vmalloc'd buffers */ 58 struct module *owner; 59 int (*create)(struct p9_client *client, 60 struct fs_context *fc); 61 void (*close)(struct p9_client *client); 62 int (*request)(struct p9_client *client, struct p9_req_t *req); 63 int (*cancel)(struct p9_client *client, struct p9_req_t *req); 64 int (*cancelled)(struct p9_client *client, struct p9_req_t *req); 65 int (*zc_request)(struct p9_client *client, struct p9_req_t *req, 66 struct iov_iter *uidata, struct iov_iter *uodata, 67 int inlen, int outlen, int in_hdr_len); 68 int (*show_options)(struct seq_file *m, struct p9_client *client); 69 }; 70 71 void v9fs_register_trans(struct p9_trans_module *m); 72 void v9fs_unregister_trans(struct p9_trans_module *m); 73 struct p9_trans_module *v9fs_get_trans_by_name(const char *s); 74 struct p9_trans_module *v9fs_get_default_trans(void); 75 void v9fs_put_trans(struct p9_trans_module *m); 76 77 #define MODULE_ALIAS_9P(transport) \ 78 MODULE_ALIAS("9p-" transport) 79 80 #endif /* NET_9P_TRANSPORT_H */ 81