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 extern unsigned int xprt_udp_slot_table_entries;
23 extern unsigned int xprt_tcp_slot_table_entries;
25 #define RPC_MIN_SLOT_TABLE (2U)
26 #define RPC_DEF_SLOT_TABLE (16U)
27 #define RPC_MAX_SLOT_TABLE (128U)
30 * Parameters for choosing a free port
32 extern unsigned int xprt_min_resvport;
33 extern unsigned int xprt_max_resvport;
35 #define RPC_MIN_RESVPORT (1U)
36 #define RPC_MAX_RESVPORT (65535U)
37 #define RPC_DEF_MIN_RESVPORT (665U)
38 #define RPC_DEF_MAX_RESVPORT (1023U)
41 * This describes a timeout strategy
44 unsigned long to_initval, /* initial timeout */
45 to_maxval, /* max timeout */
46 to_increment; /* if !exponential */
47 unsigned int to_retries; /* max # of retries */
48 unsigned char to_exponential;
51 enum rpc_display_format_t {
64 * This describes a complete RPC request
68 * This is the user-visible part
70 struct rpc_xprt * rq_xprt; /* RPC client */
71 struct xdr_buf rq_snd_buf; /* send buffer */
72 struct xdr_buf rq_rcv_buf; /* recv buffer */
75 * This is the private part
77 struct rpc_task * rq_task; /* RPC task data */
78 __be32 rq_xid; /* request XID */
79 int rq_cong; /* has incremented xprt->cong */
80 int rq_received; /* receive completed */
81 u32 rq_seqno; /* gss seq no. used on req. */
83 struct page **rq_enc_pages; /* scratch pages for use by
85 void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
86 struct list_head rq_list;
88 __u32 * rq_buffer; /* XDR encode buffer */
93 struct xdr_buf rq_private_buf; /* The receive buffer
94 * used in the softirq.
96 unsigned long rq_majortimeo; /* major timeout alarm */
97 unsigned long rq_timeout; /* Current timeout value */
98 unsigned int rq_retries; /* # of retries */
101 * Partial send handling
103 u32 rq_bytes_sent; /* Bytes we have sent */
105 unsigned long rq_xtime; /* when transmitted */
108 #define rq_svec rq_snd_buf.head
109 #define rq_slen rq_snd_buf.len
111 struct rpc_xprt_ops {
112 void (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
113 int (*reserve_xprt)(struct rpc_task *task);
114 void (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
115 void (*rpcbind)(struct rpc_task *task);
116 void (*set_port)(struct rpc_xprt *xprt, unsigned short port);
117 void (*connect)(struct rpc_task *task);
118 void * (*buf_alloc)(struct rpc_task *task, size_t size);
119 void (*buf_free)(void *buffer);
120 int (*send_request)(struct rpc_task *task);
121 void (*set_retrans_timeout)(struct rpc_task *task);
122 void (*timer)(struct rpc_task *task);
123 void (*release_request)(struct rpc_task *task);
124 void (*close)(struct rpc_xprt *xprt);
125 void (*destroy)(struct rpc_xprt *xprt);
126 void (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
130 struct kref kref; /* Reference count */
131 struct rpc_xprt_ops * ops; /* transport methods */
133 struct rpc_timeout timeout; /* timeout parms */
134 struct sockaddr_storage addr; /* server address */
135 size_t addrlen; /* size of server address */
136 int prot; /* IP protocol */
138 unsigned long cong; /* current congestion */
139 unsigned long cwnd; /* congestion window */
141 size_t max_payload; /* largest RPC payload size,
143 unsigned int tsh_size; /* size of transport specific
146 struct rpc_wait_queue binding; /* requests waiting on rpcbind */
147 struct rpc_wait_queue sending; /* requests waiting to send */
148 struct rpc_wait_queue resend; /* requests waiting to resend */
149 struct rpc_wait_queue pending; /* requests in flight */
150 struct rpc_wait_queue backlog; /* waiting for slot */
151 struct list_head free; /* free slots */
152 struct rpc_rqst * slot; /* slot table storage */
153 unsigned int max_reqs; /* total slots */
154 unsigned long state; /* transport state */
155 unsigned char shutdown : 1, /* being shut down */
156 resvport : 1; /* use a reserved port */
157 unsigned int bind_index; /* bind function index */
160 * Connection of transports
162 unsigned long connect_timeout,
167 * Disconnection of idle transports
169 struct work_struct task_cleanup;
170 struct timer_list timer;
171 unsigned long last_used,
177 spinlock_t transport_lock; /* lock transport info */
178 spinlock_t reserve_lock; /* lock slot table */
179 u32 xid; /* Next XID value to use */
180 struct rpc_task * snd_task; /* Task blocked in send */
181 struct list_head recv;
184 unsigned long bind_count, /* total number of binds */
185 connect_count, /* total number of connects */
186 connect_start, /* connect start timestamp */
187 connect_time, /* jiffies waiting for connect */
188 sends, /* how many complete requests */
189 recvs, /* how many complete requests */
190 bad_xids; /* lookup_rqst didn't find XID */
192 unsigned long long req_u, /* average requests on the wire */
193 bklog_u; /* backlog queue utilization */
196 char * address_strings[RPC_DISPLAY_MAX];
199 struct rpc_xprtsock_create {
200 int proto; /* IPPROTO_UDP or IPPROTO_TCP */
201 struct sockaddr * srcaddr; /* optional local address */
202 struct sockaddr * dstaddr; /* remote peer address */
204 struct rpc_timeout * timeout; /* optional timeout parameters */
208 * Transport operations used by ULPs
210 void xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr);
213 * Generic internal transport functions
215 struct rpc_xprt * xprt_create_transport(struct rpc_xprtsock_create *args);
216 void xprt_connect(struct rpc_task *task);
217 void xprt_reserve(struct rpc_task *task);
218 int xprt_reserve_xprt(struct rpc_task *task);
219 int xprt_reserve_xprt_cong(struct rpc_task *task);
220 int xprt_prepare_transmit(struct rpc_task *task);
221 void xprt_transmit(struct rpc_task *task);
222 void xprt_end_transmit(struct rpc_task *task);
223 int xprt_adjust_timeout(struct rpc_rqst *req);
224 void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
225 void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
226 void xprt_release(struct rpc_task *task);
227 struct rpc_xprt * xprt_get(struct rpc_xprt *xprt);
228 void xprt_put(struct rpc_xprt *xprt);
230 static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
232 return p + xprt->tsh_size;
236 * Transport switch helper functions
238 void xprt_set_retrans_timeout_def(struct rpc_task *task);
239 void xprt_set_retrans_timeout_rtt(struct rpc_task *task);
240 void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
241 void xprt_wait_for_buffer_space(struct rpc_task *task);
242 void xprt_write_space(struct rpc_xprt *xprt);
243 void xprt_update_rtt(struct rpc_task *task);
244 void xprt_adjust_cwnd(struct rpc_task *task, int result);
245 struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
246 void xprt_complete_rqst(struct rpc_task *task, int copied);
247 void xprt_release_rqst_cong(struct rpc_task *task);
248 void xprt_disconnect(struct rpc_xprt *xprt);
251 * Socket transport setup operations
253 struct rpc_xprt * xs_setup_udp(struct rpc_xprtsock_create *args);
254 struct rpc_xprt * xs_setup_tcp(struct rpc_xprtsock_create *args);
255 int init_socket_xprt(void);
256 void cleanup_socket_xprt(void);
259 * Reserved bit positions in xprt->state
261 #define XPRT_LOCKED (0)
262 #define XPRT_CONNECTED (1)
263 #define XPRT_CONNECTING (2)
264 #define XPRT_CLOSE_WAIT (3)
265 #define XPRT_BOUND (4)
266 #define XPRT_BINDING (5)
268 static inline void xprt_set_connected(struct rpc_xprt *xprt)
270 set_bit(XPRT_CONNECTED, &xprt->state);
273 static inline void xprt_clear_connected(struct rpc_xprt *xprt)
275 clear_bit(XPRT_CONNECTED, &xprt->state);
278 static inline int xprt_connected(struct rpc_xprt *xprt)
280 return test_bit(XPRT_CONNECTED, &xprt->state);
283 static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
285 return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
288 static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
290 return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
293 static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
295 smp_mb__before_clear_bit();
296 clear_bit(XPRT_CONNECTING, &xprt->state);
297 smp_mb__after_clear_bit();
300 static inline int xprt_connecting(struct rpc_xprt *xprt)
302 return test_bit(XPRT_CONNECTING, &xprt->state);
305 static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
307 return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
310 static inline void xprt_set_bound(struct rpc_xprt *xprt)
312 test_and_set_bit(XPRT_BOUND, &xprt->state);
315 static inline int xprt_bound(struct rpc_xprt *xprt)
317 return test_bit(XPRT_BOUND, &xprt->state);
320 static inline void xprt_clear_bound(struct rpc_xprt *xprt)
322 clear_bit(XPRT_BOUND, &xprt->state);
325 static inline void xprt_clear_binding(struct rpc_xprt *xprt)
327 smp_mb__before_clear_bit();
328 clear_bit(XPRT_BINDING, &xprt->state);
329 smp_mb__after_clear_bit();
332 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
334 return test_and_set_bit(XPRT_BINDING, &xprt->state);
337 #endif /* __KERNEL__*/
339 #endif /* _LINUX_SUNRPC_XPRT_H */