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Commit | Line | Data |
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1da177e4 | 1 | /* |
55aa4f58 | 2 | * linux/include/linux/sunrpc/xprt.h |
1da177e4 LT |
3 | * |
4 | * Declarations for the RPC transport interface. | |
5 | * | |
6 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | #ifndef _LINUX_SUNRPC_XPRT_H | |
10 | #define _LINUX_SUNRPC_XPRT_H | |
11 | ||
12 | #include <linux/uio.h> | |
13 | #include <linux/socket.h> | |
14 | #include <linux/in.h> | |
15 | #include <linux/sunrpc/sched.h> | |
16 | #include <linux/sunrpc/xdr.h> | |
17 | ||
1da177e4 LT |
18 | extern unsigned int xprt_udp_slot_table_entries; |
19 | extern unsigned int xprt_tcp_slot_table_entries; | |
20 | ||
21 | #define RPC_MIN_SLOT_TABLE (2U) | |
22 | #define RPC_DEF_SLOT_TABLE (16U) | |
23 | #define RPC_MAX_SLOT_TABLE (128U) | |
24 | ||
a246b010 CL |
25 | /* |
26 | * RPC call and reply header size as number of 32bit words (verifier | |
1da177e4 LT |
27 | * size computed separately) |
28 | */ | |
29 | #define RPC_CALLHDRSIZE 6 | |
30 | #define RPC_REPHDRSIZE 4 | |
31 | ||
529b33c6 CL |
32 | /* |
33 | * Parameters for choosing a free port | |
34 | */ | |
35 | extern unsigned int xprt_min_resvport; | |
36 | extern unsigned int xprt_max_resvport; | |
37 | ||
38 | #define RPC_MIN_RESVPORT (1U) | |
39 | #define RPC_MAX_RESVPORT (65535U) | |
8e037094 | 40 | #define RPC_DEF_MIN_RESVPORT (665U) |
529b33c6 CL |
41 | #define RPC_DEF_MAX_RESVPORT (1023U) |
42 | ||
1da177e4 LT |
43 | /* |
44 | * This describes a timeout strategy | |
45 | */ | |
46 | struct rpc_timeout { | |
47 | unsigned long to_initval, /* initial timeout */ | |
48 | to_maxval, /* max timeout */ | |
49 | to_increment; /* if !exponential */ | |
50 | unsigned int to_retries; /* max # of retries */ | |
51 | unsigned char to_exponential; | |
52 | }; | |
53 | ||
529b33c6 CL |
54 | struct rpc_task; |
55 | struct rpc_xprt; | |
e99170ff | 56 | struct seq_file; |
529b33c6 | 57 | |
1da177e4 LT |
58 | /* |
59 | * This describes a complete RPC request | |
60 | */ | |
61 | struct rpc_rqst { | |
62 | /* | |
63 | * This is the user-visible part | |
64 | */ | |
65 | struct rpc_xprt * rq_xprt; /* RPC client */ | |
66 | struct xdr_buf rq_snd_buf; /* send buffer */ | |
67 | struct xdr_buf rq_rcv_buf; /* recv buffer */ | |
68 | ||
69 | /* | |
70 | * This is the private part | |
71 | */ | |
72 | struct rpc_task * rq_task; /* RPC task data */ | |
73 | __u32 rq_xid; /* request XID */ | |
74 | int rq_cong; /* has incremented xprt->cong */ | |
75 | int rq_received; /* receive completed */ | |
76 | u32 rq_seqno; /* gss seq no. used on req. */ | |
ead5e1c2 BF |
77 | int rq_enc_pages_num; |
78 | struct page **rq_enc_pages; /* scratch pages for use by | |
79 | gss privacy code */ | |
80 | void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */ | |
1da177e4 LT |
81 | struct list_head rq_list; |
82 | ||
02107148 CL |
83 | __u32 * rq_buffer; /* XDR encode buffer */ |
84 | size_t rq_bufsize; | |
85 | ||
1da177e4 LT |
86 | struct xdr_buf rq_private_buf; /* The receive buffer |
87 | * used in the softirq. | |
88 | */ | |
89 | unsigned long rq_majortimeo; /* major timeout alarm */ | |
90 | unsigned long rq_timeout; /* Current timeout value */ | |
91 | unsigned int rq_retries; /* # of retries */ | |
1da177e4 LT |
92 | |
93 | /* | |
94 | * Partial send handling | |
95 | */ | |
1da177e4 LT |
96 | u32 rq_bytes_sent; /* Bytes we have sent */ |
97 | ||
98 | unsigned long rq_xtime; /* when transmitted */ | |
99 | int rq_ntrans; | |
100 | }; | |
101 | #define rq_svec rq_snd_buf.head | |
102 | #define rq_slen rq_snd_buf.len | |
103 | ||
a246b010 | 104 | struct rpc_xprt_ops { |
470056c2 | 105 | void (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize); |
12a80469 | 106 | int (*reserve_xprt)(struct rpc_task *task); |
49e9a890 | 107 | void (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task); |
92200412 | 108 | void (*set_port)(struct rpc_xprt *xprt, unsigned short port); |
a246b010 | 109 | void (*connect)(struct rpc_task *task); |
02107148 CL |
110 | void * (*buf_alloc)(struct rpc_task *task, size_t size); |
111 | void (*buf_free)(struct rpc_task *task); | |
a246b010 | 112 | int (*send_request)(struct rpc_task *task); |
fe3aca29 | 113 | void (*set_retrans_timeout)(struct rpc_task *task); |
46c0ee8b | 114 | void (*timer)(struct rpc_task *task); |
a58dd398 | 115 | void (*release_request)(struct rpc_task *task); |
a246b010 CL |
116 | void (*close)(struct rpc_xprt *xprt); |
117 | void (*destroy)(struct rpc_xprt *xprt); | |
262ca07d | 118 | void (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq); |
a246b010 | 119 | }; |
1da177e4 LT |
120 | |
121 | struct rpc_xprt { | |
a246b010 | 122 | struct rpc_xprt_ops * ops; /* transport methods */ |
1da177e4 LT |
123 | struct socket * sock; /* BSD socket layer */ |
124 | struct sock * inet; /* INET layer */ | |
125 | ||
126 | struct rpc_timeout timeout; /* timeout parms */ | |
127 | struct sockaddr_in addr; /* server address */ | |
128 | int prot; /* IP protocol */ | |
129 | ||
130 | unsigned long cong; /* current congestion */ | |
131 | unsigned long cwnd; /* congestion window */ | |
132 | ||
470056c2 | 133 | size_t rcvsize, /* transport rcv buffer size */ |
55aa4f58 | 134 | sndsize; /* transport send buffer size */ |
1da177e4 LT |
135 | |
136 | size_t max_payload; /* largest RPC payload size, | |
137 | in bytes */ | |
808012fb CL |
138 | unsigned int tsh_size; /* size of transport specific |
139 | header */ | |
1da177e4 LT |
140 | |
141 | struct rpc_wait_queue sending; /* requests waiting to send */ | |
142 | struct rpc_wait_queue resend; /* requests waiting to resend */ | |
143 | struct rpc_wait_queue pending; /* requests in flight */ | |
144 | struct rpc_wait_queue backlog; /* waiting for slot */ | |
145 | struct list_head free; /* free slots */ | |
146 | struct rpc_rqst * slot; /* slot table storage */ | |
147 | unsigned int max_reqs; /* total slots */ | |
2226feb6 | 148 | unsigned long state; /* transport state */ |
1da177e4 | 149 | unsigned char shutdown : 1, /* being shut down */ |
43118c29 | 150 | resvport : 1; /* use a reserved port */ |
1da177e4 LT |
151 | |
152 | /* | |
153 | * XID | |
154 | */ | |
155 | __u32 xid; /* Next XID value to use */ | |
156 | ||
157 | /* | |
158 | * State of TCP reply receive stuff | |
159 | */ | |
160 | u32 tcp_recm, /* Fragment header */ | |
161 | tcp_xid, /* Current XID */ | |
162 | tcp_reclen, /* fragment length */ | |
163 | tcp_offset; /* fragment offset */ | |
164 | unsigned long tcp_copied, /* copied to request */ | |
165 | tcp_flags; | |
166 | /* | |
55aa4f58 | 167 | * Connection of transports |
1da177e4 | 168 | */ |
03bf4b70 CL |
169 | unsigned long connect_timeout, |
170 | bind_timeout, | |
171 | reestablish_timeout; | |
55aa4f58 | 172 | struct work_struct connect_worker; |
1da177e4 | 173 | unsigned short port; |
03bf4b70 | 174 | |
1da177e4 | 175 | /* |
55aa4f58 | 176 | * Disconnection of idle transports |
1da177e4 LT |
177 | */ |
178 | struct work_struct task_cleanup; | |
179 | struct timer_list timer; | |
03bf4b70 CL |
180 | unsigned long last_used, |
181 | idle_timeout; | |
1da177e4 LT |
182 | |
183 | /* | |
184 | * Send stuff | |
185 | */ | |
4a0f8c04 | 186 | spinlock_t transport_lock; /* lock transport info */ |
5dc07727 | 187 | spinlock_t reserve_lock; /* lock slot table */ |
1da177e4 LT |
188 | struct rpc_task * snd_task; /* Task blocked in send */ |
189 | ||
190 | struct list_head recv; | |
191 | ||
262ca07d CL |
192 | struct { |
193 | unsigned long bind_count, /* total number of binds */ | |
194 | connect_count, /* total number of connects */ | |
195 | connect_start, /* connect start timestamp */ | |
196 | connect_time, /* jiffies waiting for connect */ | |
197 | sends, /* how many complete requests */ | |
198 | recvs, /* how many complete requests */ | |
199 | bad_xids; /* lookup_rqst didn't find XID */ | |
200 | ||
201 | unsigned long long req_u, /* average requests on the wire */ | |
202 | bklog_u; /* backlog queue utilization */ | |
203 | } stat; | |
1da177e4 LT |
204 | |
205 | void (*old_data_ready)(struct sock *, int); | |
206 | void (*old_state_change)(struct sock *); | |
207 | void (*old_write_space)(struct sock *); | |
1da177e4 LT |
208 | }; |
209 | ||
a246b010 CL |
210 | #define XPRT_LAST_FRAG (1 << 0) |
211 | #define XPRT_COPY_RECM (1 << 1) | |
212 | #define XPRT_COPY_XID (1 << 2) | |
213 | #define XPRT_COPY_DATA (1 << 3) | |
214 | ||
1da177e4 LT |
215 | #ifdef __KERNEL__ |
216 | ||
55aa4f58 CL |
217 | /* |
218 | * Transport operations used by ULPs | |
219 | */ | |
220 | struct rpc_xprt * xprt_create_proto(int proto, struct sockaddr_in *addr, struct rpc_timeout *to); | |
221 | void xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr); | |
222 | ||
223 | /* | |
224 | * Generic internal transport functions | |
225 | */ | |
226 | void xprt_connect(struct rpc_task *task); | |
227 | void xprt_reserve(struct rpc_task *task); | |
12a80469 CL |
228 | int xprt_reserve_xprt(struct rpc_task *task); |
229 | int xprt_reserve_xprt_cong(struct rpc_task *task); | |
55aa4f58 CL |
230 | int xprt_prepare_transmit(struct rpc_task *task); |
231 | void xprt_transmit(struct rpc_task *task); | |
e0ab53de | 232 | void xprt_end_transmit(struct rpc_task *task); |
1da177e4 | 233 | int xprt_adjust_timeout(struct rpc_rqst *req); |
49e9a890 CL |
234 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task); |
235 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task); | |
55aa4f58 CL |
236 | void xprt_release(struct rpc_task *task); |
237 | int xprt_destroy(struct rpc_xprt *xprt); | |
238 | ||
808012fb CL |
239 | static inline u32 *xprt_skip_transport_header(struct rpc_xprt *xprt, u32 *p) |
240 | { | |
241 | return p + xprt->tsh_size; | |
242 | } | |
243 | ||
55aa4f58 CL |
244 | /* |
245 | * Transport switch helper functions | |
246 | */ | |
fe3aca29 CL |
247 | void xprt_set_retrans_timeout_def(struct rpc_task *task); |
248 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task); | |
55aa4f58 | 249 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status); |
c7b2cae8 CL |
250 | void xprt_wait_for_buffer_space(struct rpc_task *task); |
251 | void xprt_write_space(struct rpc_xprt *xprt); | |
1570c1e4 | 252 | void xprt_update_rtt(struct rpc_task *task); |
46c0ee8b | 253 | void xprt_adjust_cwnd(struct rpc_task *task, int result); |
55aa4f58 | 254 | struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, u32 xid); |
1570c1e4 | 255 | void xprt_complete_rqst(struct rpc_task *task, int copied); |
a58dd398 | 256 | void xprt_release_rqst_cong(struct rpc_task *task); |
55aa4f58 CL |
257 | void xprt_disconnect(struct rpc_xprt *xprt); |
258 | ||
259 | /* | |
260 | * Socket transport setup operations | |
261 | */ | |
262 | int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to); | |
263 | int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to); | |
1da177e4 | 264 | |
2226feb6 CL |
265 | /* |
266 | * Reserved bit positions in xprt->state | |
267 | */ | |
268 | #define XPRT_LOCKED (0) | |
269 | #define XPRT_CONNECTED (1) | |
270 | #define XPRT_CONNECTING (2) | |
632e3bdc | 271 | #define XPRT_CLOSE_WAIT (3) |
ec739ef0 | 272 | #define XPRT_BOUND (4) |
2226feb6 CL |
273 | |
274 | static inline void xprt_set_connected(struct rpc_xprt *xprt) | |
275 | { | |
276 | set_bit(XPRT_CONNECTED, &xprt->state); | |
277 | } | |
278 | ||
279 | static inline void xprt_clear_connected(struct rpc_xprt *xprt) | |
280 | { | |
281 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
282 | } | |
283 | ||
284 | static inline int xprt_connected(struct rpc_xprt *xprt) | |
285 | { | |
286 | return test_bit(XPRT_CONNECTED, &xprt->state); | |
287 | } | |
288 | ||
289 | static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt) | |
290 | { | |
291 | return test_and_set_bit(XPRT_CONNECTED, &xprt->state); | |
292 | } | |
293 | ||
294 | static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt) | |
295 | { | |
296 | return test_and_clear_bit(XPRT_CONNECTED, &xprt->state); | |
297 | } | |
298 | ||
299 | static inline void xprt_clear_connecting(struct rpc_xprt *xprt) | |
300 | { | |
301 | smp_mb__before_clear_bit(); | |
302 | clear_bit(XPRT_CONNECTING, &xprt->state); | |
303 | smp_mb__after_clear_bit(); | |
304 | } | |
305 | ||
306 | static inline int xprt_connecting(struct rpc_xprt *xprt) | |
307 | { | |
308 | return test_bit(XPRT_CONNECTING, &xprt->state); | |
309 | } | |
310 | ||
311 | static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt) | |
312 | { | |
313 | return test_and_set_bit(XPRT_CONNECTING, &xprt->state); | |
314 | } | |
1da177e4 | 315 | |
ec739ef0 CL |
316 | static inline void xprt_set_bound(struct rpc_xprt *xprt) |
317 | { | |
318 | test_and_set_bit(XPRT_BOUND, &xprt->state); | |
319 | } | |
320 | ||
321 | static inline int xprt_bound(struct rpc_xprt *xprt) | |
322 | { | |
323 | return test_bit(XPRT_BOUND, &xprt->state); | |
324 | } | |
325 | ||
326 | static inline void xprt_clear_bound(struct rpc_xprt *xprt) | |
327 | { | |
328 | clear_bit(XPRT_BOUND, &xprt->state); | |
329 | } | |
330 | ||
1da177e4 LT |
331 | #endif /* __KERNEL__*/ |
332 | ||
333 | #endif /* _LINUX_SUNRPC_XPRT_H */ |