2 * linux/include/linux/sunrpc/xprt.h
4 * Declarations for the RPC transport interface.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
9 #ifndef _LINUX_SUNRPC_XPRT_H
10 #define _LINUX_SUNRPC_XPRT_H
12 #include <linux/uio.h>
13 #include <linux/socket.h>
15 #include <linux/kref.h>
16 #include <linux/sunrpc/sched.h>
17 #include <linux/sunrpc/xdr.h>
18 #include <linux/sunrpc/msg_prot.h>
22 #define RPC_MIN_SLOT_TABLE (2U)
23 #define RPC_DEF_SLOT_TABLE (16U)
24 #define RPC_MAX_SLOT_TABLE (128U)
27 * This describes a timeout strategy
30 unsigned long to_initval, /* initial timeout */
31 to_maxval, /* max timeout */
32 to_increment; /* if !exponential */
33 unsigned int to_retries; /* max # of retries */
34 unsigned char to_exponential;
37 enum rpc_display_format_t {
44 RPC_DISPLAY_UNIVERSAL_ADDR,
54 * This describes a complete RPC request
58 * This is the user-visible part
60 struct rpc_xprt * rq_xprt; /* RPC client */
61 struct xdr_buf rq_snd_buf; /* send buffer */
62 struct xdr_buf rq_rcv_buf; /* recv buffer */
65 * This is the private part
67 struct rpc_task * rq_task; /* RPC task data */
68 __be32 rq_xid; /* request XID */
69 int rq_cong; /* has incremented xprt->cong */
70 int rq_received; /* receive completed */
71 u32 rq_seqno; /* gss seq no. used on req. */
73 struct page **rq_enc_pages; /* scratch pages for use by
75 void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
76 struct list_head rq_list;
78 __u32 * rq_buffer; /* XDR encode buffer */
83 struct xdr_buf rq_private_buf; /* The receive buffer
84 * used in the softirq.
86 unsigned long rq_majortimeo; /* major timeout alarm */
87 unsigned long rq_timeout; /* Current timeout value */
88 unsigned int rq_retries; /* # of retries */
91 * Partial send handling
93 u32 rq_bytes_sent; /* Bytes we have sent */
95 unsigned long rq_xtime; /* when transmitted */
98 #define rq_svec rq_snd_buf.head
99 #define rq_slen rq_snd_buf.len
101 struct rpc_xprt_ops {
102 void (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
103 int (*reserve_xprt)(struct rpc_task *task);
104 void (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
105 void (*rpcbind)(struct rpc_task *task);
106 void (*set_port)(struct rpc_xprt *xprt, unsigned short port);
107 void (*connect)(struct rpc_task *task);
108 void * (*buf_alloc)(struct rpc_task *task, size_t size);
109 void (*buf_free)(void *buffer);
110 int (*send_request)(struct rpc_task *task);
111 void (*set_retrans_timeout)(struct rpc_task *task);
112 void (*timer)(struct rpc_task *task);
113 void (*release_request)(struct rpc_task *task);
114 void (*close)(struct rpc_xprt *xprt);
115 void (*destroy)(struct rpc_xprt *xprt);
116 void (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
120 struct kref kref; /* Reference count */
121 struct rpc_xprt_ops * ops; /* transport methods */
123 const struct rpc_timeout *timeout; /* timeout parms */
124 struct sockaddr_storage addr; /* server address */
125 size_t addrlen; /* size of server address */
126 int prot; /* IP protocol */
128 unsigned long cong; /* current congestion */
129 unsigned long cwnd; /* congestion window */
131 size_t max_payload; /* largest RPC payload size,
133 unsigned int tsh_size; /* size of transport specific
136 struct rpc_wait_queue binding; /* requests waiting on rpcbind */
137 struct rpc_wait_queue sending; /* requests waiting to send */
138 struct rpc_wait_queue resend; /* requests waiting to resend */
139 struct rpc_wait_queue pending; /* requests in flight */
140 struct rpc_wait_queue backlog; /* waiting for slot */
141 struct list_head free; /* free slots */
142 struct rpc_rqst * slot; /* slot table storage */
143 unsigned int max_reqs; /* total slots */
144 unsigned long state; /* transport state */
145 unsigned char shutdown : 1, /* being shut down */
146 resvport : 1; /* use a reserved port */
147 unsigned int bind_index; /* bind function index */
150 * Connection of transports
152 unsigned long connect_timeout,
157 * Disconnection of idle transports
159 struct work_struct task_cleanup;
160 struct timer_list timer;
161 unsigned long last_used,
167 spinlock_t transport_lock; /* lock transport info */
168 spinlock_t reserve_lock; /* lock slot table */
169 u32 xid; /* Next XID value to use */
170 struct rpc_task * snd_task; /* Task blocked in send */
171 struct list_head recv;
174 unsigned long bind_count, /* total number of binds */
175 connect_count, /* total number of connects */
176 connect_start, /* connect start timestamp */
177 connect_time, /* jiffies waiting for connect */
178 sends, /* how many complete requests */
179 recvs, /* how many complete requests */
180 bad_xids; /* lookup_rqst didn't find XID */
182 unsigned long long req_u, /* average requests on the wire */
183 bklog_u; /* backlog queue utilization */
186 const char *address_strings[RPC_DISPLAY_MAX];
190 int ident; /* XPRT_TRANSPORT identifier */
191 struct sockaddr * srcaddr; /* optional local address */
192 struct sockaddr * dstaddr; /* remote peer address */
197 struct list_head list;
198 int ident; /* XPRT_TRANSPORT identifier */
199 struct rpc_xprt * (*setup)(struct xprt_create *);
200 struct module *owner;
205 * Generic internal transport functions
207 struct rpc_xprt *xprt_create_transport(struct xprt_create *args);
208 void xprt_connect(struct rpc_task *task);
209 void xprt_reserve(struct rpc_task *task);
210 int xprt_reserve_xprt(struct rpc_task *task);
211 int xprt_reserve_xprt_cong(struct rpc_task *task);
212 int xprt_prepare_transmit(struct rpc_task *task);
213 void xprt_transmit(struct rpc_task *task);
214 void xprt_end_transmit(struct rpc_task *task);
215 int xprt_adjust_timeout(struct rpc_rqst *req);
216 void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
217 void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
218 void xprt_release(struct rpc_task *task);
219 struct rpc_xprt * xprt_get(struct rpc_xprt *xprt);
220 void xprt_put(struct rpc_xprt *xprt);
222 static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
224 return p + xprt->tsh_size;
228 * Transport switch helper functions
230 int xprt_register_transport(struct xprt_class *type);
231 int xprt_unregister_transport(struct xprt_class *type);
232 void xprt_set_retrans_timeout_def(struct rpc_task *task);
233 void xprt_set_retrans_timeout_rtt(struct rpc_task *task);
234 void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
235 void xprt_wait_for_buffer_space(struct rpc_task *task);
236 void xprt_write_space(struct rpc_xprt *xprt);
237 void xprt_update_rtt(struct rpc_task *task);
238 void xprt_adjust_cwnd(struct rpc_task *task, int result);
239 struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
240 void xprt_complete_rqst(struct rpc_task *task, int copied);
241 void xprt_release_rqst_cong(struct rpc_task *task);
242 void xprt_disconnect_done(struct rpc_xprt *xprt);
243 void xprt_force_disconnect(struct rpc_xprt *xprt);
246 * Reserved bit positions in xprt->state
248 #define XPRT_LOCKED (0)
249 #define XPRT_CONNECTED (1)
250 #define XPRT_CONNECTING (2)
251 #define XPRT_CLOSE_WAIT (3)
252 #define XPRT_BOUND (4)
253 #define XPRT_BINDING (5)
254 #define XPRT_CLOSING (6)
256 static inline void xprt_set_connected(struct rpc_xprt *xprt)
258 set_bit(XPRT_CONNECTED, &xprt->state);
261 static inline void xprt_clear_connected(struct rpc_xprt *xprt)
263 clear_bit(XPRT_CONNECTED, &xprt->state);
266 static inline int xprt_connected(struct rpc_xprt *xprt)
268 return test_bit(XPRT_CONNECTED, &xprt->state);
271 static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
273 return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
276 static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
278 return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
281 static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
283 smp_mb__before_clear_bit();
284 clear_bit(XPRT_CONNECTING, &xprt->state);
285 smp_mb__after_clear_bit();
288 static inline int xprt_connecting(struct rpc_xprt *xprt)
290 return test_bit(XPRT_CONNECTING, &xprt->state);
293 static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
295 return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
298 static inline void xprt_set_bound(struct rpc_xprt *xprt)
300 test_and_set_bit(XPRT_BOUND, &xprt->state);
303 static inline int xprt_bound(struct rpc_xprt *xprt)
305 return test_bit(XPRT_BOUND, &xprt->state);
308 static inline void xprt_clear_bound(struct rpc_xprt *xprt)
310 clear_bit(XPRT_BOUND, &xprt->state);
313 static inline void xprt_clear_binding(struct rpc_xprt *xprt)
315 smp_mb__before_clear_bit();
316 clear_bit(XPRT_BINDING, &xprt->state);
317 smp_mb__after_clear_bit();
320 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
322 return test_and_set_bit(XPRT_BINDING, &xprt->state);
325 #endif /* __KERNEL__*/
327 #endif /* _LINUX_SUNRPC_XPRT_H */