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>
20 extern unsigned int xprt_udp_slot_table_entries;
21 extern unsigned int xprt_tcp_slot_table_entries;
23 #define RPC_MIN_SLOT_TABLE (2U)
24 #define RPC_DEF_SLOT_TABLE (16U)
25 #define RPC_MAX_SLOT_TABLE (128U)
28 * Parameters for choosing a free port
30 extern unsigned int xprt_min_resvport;
31 extern unsigned int xprt_max_resvport;
33 #define RPC_MIN_RESVPORT (1U)
34 #define RPC_MAX_RESVPORT (65535U)
35 #define RPC_DEF_MIN_RESVPORT (665U)
36 #define RPC_DEF_MAX_RESVPORT (1023U)
39 * This describes a timeout strategy
42 unsigned long to_initval, /* initial timeout */
43 to_maxval, /* max timeout */
44 to_increment; /* if !exponential */
45 unsigned int to_retries; /* max # of retries */
46 unsigned char to_exponential;
49 enum rpc_display_format_t {
62 * This describes a complete RPC request
66 * This is the user-visible part
68 struct rpc_xprt * rq_xprt; /* RPC client */
69 struct xdr_buf rq_snd_buf; /* send buffer */
70 struct xdr_buf rq_rcv_buf; /* recv buffer */
73 * This is the private part
75 struct rpc_task * rq_task; /* RPC task data */
76 __be32 rq_xid; /* request XID */
77 int rq_cong; /* has incremented xprt->cong */
78 int rq_received; /* receive completed */
79 u32 rq_seqno; /* gss seq no. used on req. */
81 struct page **rq_enc_pages; /* scratch pages for use by
83 void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
84 struct list_head rq_list;
86 __u32 * rq_buffer; /* XDR encode buffer */
89 struct xdr_buf rq_private_buf; /* The receive buffer
90 * used in the softirq.
92 unsigned long rq_majortimeo; /* major timeout alarm */
93 unsigned long rq_timeout; /* Current timeout value */
94 unsigned int rq_retries; /* # of retries */
97 * Partial send handling
99 u32 rq_bytes_sent; /* Bytes we have sent */
101 unsigned long rq_xtime; /* when transmitted */
104 #define rq_svec rq_snd_buf.head
105 #define rq_slen rq_snd_buf.len
107 struct rpc_xprt_ops {
108 void (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
109 char * (*print_addr)(struct rpc_xprt *xprt, enum rpc_display_format_t format);
110 int (*reserve_xprt)(struct rpc_task *task);
111 void (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
112 void (*rpcbind)(struct rpc_task *task);
113 void (*set_port)(struct rpc_xprt *xprt, unsigned short port);
114 void (*connect)(struct rpc_task *task);
115 void * (*buf_alloc)(struct rpc_task *task, size_t size);
116 void (*buf_free)(struct rpc_task *task);
117 int (*send_request)(struct rpc_task *task);
118 void (*set_retrans_timeout)(struct rpc_task *task);
119 void (*timer)(struct rpc_task *task);
120 void (*release_request)(struct rpc_task *task);
121 void (*close)(struct rpc_xprt *xprt);
122 void (*destroy)(struct rpc_xprt *xprt);
123 void (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
127 struct kref kref; /* Reference count */
128 struct rpc_xprt_ops * ops; /* transport methods */
129 struct socket * sock; /* BSD socket layer */
130 struct sock * inet; /* INET layer */
132 struct rpc_timeout timeout; /* timeout parms */
133 struct sockaddr_storage addr; /* server address */
134 size_t addrlen; /* size of server address */
135 int prot; /* IP protocol */
137 unsigned long cong; /* current congestion */
138 unsigned long cwnd; /* congestion window */
140 size_t rcvsize, /* transport rcv buffer size */
141 sndsize; /* transport send buffer size */
143 size_t max_payload; /* largest RPC payload size,
145 unsigned int tsh_size; /* size of transport specific
148 struct rpc_wait_queue binding; /* requests waiting on rpcbind */
149 struct rpc_wait_queue sending; /* requests waiting to send */
150 struct rpc_wait_queue resend; /* requests waiting to resend */
151 struct rpc_wait_queue pending; /* requests in flight */
152 struct rpc_wait_queue backlog; /* waiting for slot */
153 struct list_head free; /* free slots */
154 struct rpc_rqst * slot; /* slot table storage */
155 unsigned int max_reqs; /* total slots */
156 unsigned long state; /* transport state */
157 unsigned char shutdown : 1, /* being shut down */
158 resvport : 1; /* use a reserved port */
163 __u32 xid; /* Next XID value to use */
166 * State of TCP reply receive stuff
168 __be32 tcp_recm, /* Fragment header */
169 tcp_xid; /* Current XID */
170 u32 tcp_reclen, /* fragment length */
171 tcp_offset; /* fragment offset */
172 unsigned long tcp_copied, /* copied to request */
175 * Connection of transports
177 unsigned long connect_timeout,
180 struct work_struct connect_worker;
184 * Disconnection of idle transports
186 struct work_struct task_cleanup;
187 struct timer_list timer;
188 unsigned long last_used,
194 spinlock_t transport_lock; /* lock transport info */
195 spinlock_t reserve_lock; /* lock slot table */
196 struct rpc_task * snd_task; /* Task blocked in send */
198 struct list_head recv;
201 unsigned long bind_count, /* total number of binds */
202 connect_count, /* total number of connects */
203 connect_start, /* connect start timestamp */
204 connect_time, /* jiffies waiting for connect */
205 sends, /* how many complete requests */
206 recvs, /* how many complete requests */
207 bad_xids; /* lookup_rqst didn't find XID */
209 unsigned long long req_u, /* average requests on the wire */
210 bklog_u; /* backlog queue utilization */
213 void (*old_data_ready)(struct sock *, int);
214 void (*old_state_change)(struct sock *);
215 void (*old_write_space)(struct sock *);
217 char * address_strings[RPC_DISPLAY_MAX];
220 #define XPRT_LAST_FRAG (1 << 0)
221 #define XPRT_COPY_RECM (1 << 1)
222 #define XPRT_COPY_XID (1 << 2)
223 #define XPRT_COPY_DATA (1 << 3)
228 * Transport operations used by ULPs
230 void xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr);
233 * Generic internal transport functions
235 struct rpc_xprt * xprt_create_transport(int proto, struct sockaddr *addr, size_t size, struct rpc_timeout *toparms);
236 void xprt_connect(struct rpc_task *task);
237 void xprt_reserve(struct rpc_task *task);
238 int xprt_reserve_xprt(struct rpc_task *task);
239 int xprt_reserve_xprt_cong(struct rpc_task *task);
240 int xprt_prepare_transmit(struct rpc_task *task);
241 void xprt_transmit(struct rpc_task *task);
242 void xprt_end_transmit(struct rpc_task *task);
243 int xprt_adjust_timeout(struct rpc_rqst *req);
244 void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
245 void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
246 void xprt_release(struct rpc_task *task);
247 struct rpc_xprt * xprt_get(struct rpc_xprt *xprt);
248 void xprt_put(struct rpc_xprt *xprt);
250 static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
252 return p + xprt->tsh_size;
256 * Transport switch helper functions
258 void xprt_set_retrans_timeout_def(struct rpc_task *task);
259 void xprt_set_retrans_timeout_rtt(struct rpc_task *task);
260 void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
261 void xprt_wait_for_buffer_space(struct rpc_task *task);
262 void xprt_write_space(struct rpc_xprt *xprt);
263 void xprt_update_rtt(struct rpc_task *task);
264 void xprt_adjust_cwnd(struct rpc_task *task, int result);
265 struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
266 void xprt_complete_rqst(struct rpc_task *task, int copied);
267 void xprt_release_rqst_cong(struct rpc_task *task);
268 void xprt_disconnect(struct rpc_xprt *xprt);
271 * Socket transport setup operations
273 int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to);
274 int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to);
277 * Reserved bit positions in xprt->state
279 #define XPRT_LOCKED (0)
280 #define XPRT_CONNECTED (1)
281 #define XPRT_CONNECTING (2)
282 #define XPRT_CLOSE_WAIT (3)
283 #define XPRT_BOUND (4)
284 #define XPRT_BINDING (5)
286 static inline void xprt_set_connected(struct rpc_xprt *xprt)
288 set_bit(XPRT_CONNECTED, &xprt->state);
291 static inline void xprt_clear_connected(struct rpc_xprt *xprt)
293 clear_bit(XPRT_CONNECTED, &xprt->state);
296 static inline int xprt_connected(struct rpc_xprt *xprt)
298 return test_bit(XPRT_CONNECTED, &xprt->state);
301 static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
303 return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
306 static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
308 return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
311 static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
313 smp_mb__before_clear_bit();
314 clear_bit(XPRT_CONNECTING, &xprt->state);
315 smp_mb__after_clear_bit();
318 static inline int xprt_connecting(struct rpc_xprt *xprt)
320 return test_bit(XPRT_CONNECTING, &xprt->state);
323 static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
325 return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
328 static inline void xprt_set_bound(struct rpc_xprt *xprt)
330 test_and_set_bit(XPRT_BOUND, &xprt->state);
333 static inline int xprt_bound(struct rpc_xprt *xprt)
335 return test_bit(XPRT_BOUND, &xprt->state);
338 static inline void xprt_clear_bound(struct rpc_xprt *xprt)
340 clear_bit(XPRT_BOUND, &xprt->state);
343 static inline void xprt_clear_binding(struct rpc_xprt *xprt)
345 smp_mb__before_clear_bit();
346 clear_bit(XPRT_BINDING, &xprt->state);
347 smp_mb__after_clear_bit();
350 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
352 return test_and_set_bit(XPRT_BINDING, &xprt->state);
355 #endif /* __KERNEL__*/
357 #endif /* _LINUX_SUNRPC_XPRT_H */