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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> | |
ff839970 | 15 | #include <linux/ktime.h> |
1da177e4 LT |
16 | #include <linux/sunrpc/sched.h> |
17 | #include <linux/sunrpc/xdr.h> | |
7adae489 | 18 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 | 19 | |
96802a09 FM |
20 | #ifdef __KERNEL__ |
21 | ||
1da177e4 LT |
22 | #define RPC_MIN_SLOT_TABLE (2U) |
23 | #define RPC_DEF_SLOT_TABLE (16U) | |
d9ba131d | 24 | #define RPC_MAX_SLOT_TABLE_LIMIT (65536U) |
88338124 | 25 | #define RPC_MAX_SLOT_TABLE RPC_MAX_SLOT_TABLE_LIMIT |
1da177e4 | 26 | |
1da177e4 LT |
27 | /* |
28 | * This describes a timeout strategy | |
29 | */ | |
30 | struct rpc_timeout { | |
31 | unsigned long to_initval, /* initial timeout */ | |
32 | to_maxval, /* max timeout */ | |
33 | to_increment; /* if !exponential */ | |
34 | unsigned int to_retries; /* max # of retries */ | |
35 | unsigned char to_exponential; | |
36 | }; | |
37 | ||
edb267a6 CL |
38 | enum rpc_display_format_t { |
39 | RPC_DISPLAY_ADDR = 0, | |
40 | RPC_DISPLAY_PORT, | |
41 | RPC_DISPLAY_PROTO, | |
fbfe3cc6 CL |
42 | RPC_DISPLAY_HEX_ADDR, |
43 | RPC_DISPLAY_HEX_PORT, | |
4417c8c4 | 44 | RPC_DISPLAY_NETID, |
edb267a6 CL |
45 | RPC_DISPLAY_MAX, |
46 | }; | |
47 | ||
529b33c6 CL |
48 | struct rpc_task; |
49 | struct rpc_xprt; | |
e99170ff | 50 | struct seq_file; |
529b33c6 | 51 | |
1da177e4 LT |
52 | /* |
53 | * This describes a complete RPC request | |
54 | */ | |
55 | struct rpc_rqst { | |
56 | /* | |
57 | * This is the user-visible part | |
58 | */ | |
59 | struct rpc_xprt * rq_xprt; /* RPC client */ | |
60 | struct xdr_buf rq_snd_buf; /* send buffer */ | |
61 | struct xdr_buf rq_rcv_buf; /* recv buffer */ | |
62 | ||
63 | /* | |
64 | * This is the private part | |
65 | */ | |
66 | struct rpc_task * rq_task; /* RPC task data */ | |
a17c2153 | 67 | struct rpc_cred * rq_cred; /* Bound cred */ |
d8ed029d | 68 | __be32 rq_xid; /* request XID */ |
1da177e4 | 69 | int rq_cong; /* has incremented xprt->cong */ |
1da177e4 | 70 | u32 rq_seqno; /* gss seq no. used on req. */ |
ead5e1c2 BF |
71 | int rq_enc_pages_num; |
72 | struct page **rq_enc_pages; /* scratch pages for use by | |
73 | gss privacy code */ | |
74 | void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */ | |
1da177e4 LT |
75 | struct list_head rq_list; |
76 | ||
02107148 | 77 | __u32 * rq_buffer; /* XDR encode buffer */ |
c977a2ef | 78 | size_t rq_callsize, |
2bea90d4 | 79 | rq_rcvsize; |
d60dbb20 TM |
80 | size_t rq_xmit_bytes_sent; /* total bytes sent */ |
81 | size_t rq_reply_bytes_recvd; /* total reply bytes */ | |
82 | /* received */ | |
02107148 | 83 | |
1da177e4 LT |
84 | struct xdr_buf rq_private_buf; /* The receive buffer |
85 | * used in the softirq. | |
86 | */ | |
87 | unsigned long rq_majortimeo; /* major timeout alarm */ | |
88 | unsigned long rq_timeout; /* Current timeout value */ | |
d60dbb20 | 89 | ktime_t rq_rtt; /* round-trip time */ |
1da177e4 | 90 | unsigned int rq_retries; /* # of retries */ |
7c1d71cf TM |
91 | unsigned int rq_connect_cookie; |
92 | /* A cookie used to track the | |
93 | state of the transport | |
94 | connection */ | |
1da177e4 LT |
95 | |
96 | /* | |
97 | * Partial send handling | |
98 | */ | |
1da177e4 LT |
99 | u32 rq_bytes_sent; /* Bytes we have sent */ |
100 | ||
ff839970 | 101 | ktime_t rq_xtime; /* transmit time stamp */ |
1da177e4 | 102 | int rq_ntrans; |
56632b5b | 103 | |
9e00abc3 | 104 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
56632b5b RL |
105 | struct list_head rq_bc_list; /* Callback service list */ |
106 | unsigned long rq_bc_pa_state; /* Backchannel prealloc state */ | |
107 | struct list_head rq_bc_pa_list; /* Backchannel prealloc list */ | |
9e00abc3 | 108 | #endif /* CONFIG_SUNRPC_BACKCHANEL */ |
1da177e4 LT |
109 | }; |
110 | #define rq_svec rq_snd_buf.head | |
111 | #define rq_slen rq_snd_buf.len | |
112 | ||
a246b010 | 113 | struct rpc_xprt_ops { |
470056c2 | 114 | void (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize); |
43cedbf0 | 115 | int (*reserve_xprt)(struct rpc_xprt *xprt, struct rpc_task *task); |
49e9a890 | 116 | void (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task); |
bbf7c1dd | 117 | void (*rpcbind)(struct rpc_task *task); |
92200412 | 118 | void (*set_port)(struct rpc_xprt *xprt, unsigned short port); |
a246b010 | 119 | void (*connect)(struct rpc_task *task); |
02107148 | 120 | void * (*buf_alloc)(struct rpc_task *task, size_t size); |
c5a4dd8b | 121 | void (*buf_free)(void *buffer); |
a246b010 | 122 | int (*send_request)(struct rpc_task *task); |
fe3aca29 | 123 | void (*set_retrans_timeout)(struct rpc_task *task); |
46c0ee8b | 124 | void (*timer)(struct rpc_task *task); |
a58dd398 | 125 | void (*release_request)(struct rpc_task *task); |
a246b010 CL |
126 | void (*close)(struct rpc_xprt *xprt); |
127 | void (*destroy)(struct rpc_xprt *xprt); | |
262ca07d | 128 | void (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq); |
a246b010 | 129 | }; |
1da177e4 | 130 | |
f300baba AB |
131 | /* |
132 | * RPC transport identifiers | |
133 | * | |
134 | * To preserve compatibility with the historical use of raw IP protocol | |
135 | * id's for transport selection, UDP and TCP identifiers are specified | |
136 | * with the previous values. No such restriction exists for new transports, | |
137 | * except that they may not collide with these values (17 and 6, | |
138 | * respectively). | |
139 | */ | |
140 | #define XPRT_TRANSPORT_BC (1 << 31) | |
141 | enum xprt_transports { | |
142 | XPRT_TRANSPORT_UDP = IPPROTO_UDP, | |
143 | XPRT_TRANSPORT_TCP = IPPROTO_TCP, | |
144 | XPRT_TRANSPORT_BC_TCP = IPPROTO_TCP | XPRT_TRANSPORT_BC, | |
176e21ee CL |
145 | XPRT_TRANSPORT_RDMA = 256, |
146 | XPRT_TRANSPORT_LOCAL = 257, | |
f300baba AB |
147 | }; |
148 | ||
1da177e4 | 149 | struct rpc_xprt { |
a8de240a | 150 | atomic_t count; /* Reference count */ |
a246b010 | 151 | struct rpc_xprt_ops * ops; /* transport methods */ |
1da177e4 | 152 | |
ba7392bb | 153 | const struct rpc_timeout *timeout; /* timeout parms */ |
c4efcb1d CL |
154 | struct sockaddr_storage addr; /* server address */ |
155 | size_t addrlen; /* size of server address */ | |
1da177e4 LT |
156 | int prot; /* IP protocol */ |
157 | ||
158 | unsigned long cong; /* current congestion */ | |
159 | unsigned long cwnd; /* congestion window */ | |
160 | ||
1da177e4 LT |
161 | size_t max_payload; /* largest RPC payload size, |
162 | in bytes */ | |
808012fb CL |
163 | unsigned int tsh_size; /* size of transport specific |
164 | header */ | |
1da177e4 | 165 | |
4a68179d | 166 | struct rpc_wait_queue binding; /* requests waiting on rpcbind */ |
1da177e4 | 167 | struct rpc_wait_queue sending; /* requests waiting to send */ |
1da177e4 LT |
168 | struct rpc_wait_queue pending; /* requests in flight */ |
169 | struct rpc_wait_queue backlog; /* waiting for slot */ | |
170 | struct list_head free; /* free slots */ | |
d9ba131d TM |
171 | unsigned int max_reqs; /* max number of slots */ |
172 | unsigned int min_reqs; /* min number of slots */ | |
173 | atomic_t num_reqs; /* total slots */ | |
2226feb6 | 174 | unsigned long state; /* transport state */ |
1da177e4 | 175 | unsigned char shutdown : 1, /* being shut down */ |
43118c29 | 176 | resvport : 1; /* use a reserved port */ |
a509050b | 177 | unsigned int bind_index; /* bind function index */ |
1da177e4 | 178 | |
1da177e4 | 179 | /* |
55aa4f58 | 180 | * Connection of transports |
1da177e4 | 181 | */ |
a8ce4a8f | 182 | unsigned long bind_timeout, |
03bf4b70 | 183 | reestablish_timeout; |
7c1d71cf TM |
184 | unsigned int connect_cookie; /* A cookie that gets bumped |
185 | every time the transport | |
186 | is reconnected */ | |
03bf4b70 | 187 | |
1da177e4 | 188 | /* |
55aa4f58 | 189 | * Disconnection of idle transports |
1da177e4 LT |
190 | */ |
191 | struct work_struct task_cleanup; | |
192 | struct timer_list timer; | |
03bf4b70 CL |
193 | unsigned long last_used, |
194 | idle_timeout; | |
1da177e4 LT |
195 | |
196 | /* | |
197 | * Send stuff | |
198 | */ | |
4a0f8c04 | 199 | spinlock_t transport_lock; /* lock transport info */ |
5dc07727 | 200 | spinlock_t reserve_lock; /* lock slot table */ |
e744cf2e | 201 | u32 xid; /* Next XID value to use */ |
1da177e4 | 202 | struct rpc_task * snd_task; /* Task blocked in send */ |
4cfc7e60 | 203 | struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */ |
9e00abc3 | 204 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
56632b5b RL |
205 | struct svc_serv *bc_serv; /* The RPC service which will */ |
206 | /* process the callback */ | |
fb7a0b9a | 207 | unsigned int bc_alloc_count; /* Total number of preallocs */ |
56632b5b RL |
208 | spinlock_t bc_pa_lock; /* Protects the preallocated |
209 | * items */ | |
210 | struct list_head bc_pa_list; /* List of preallocated | |
211 | * backchannel rpc_rqst's */ | |
9e00abc3 | 212 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1da177e4 LT |
213 | struct list_head recv; |
214 | ||
262ca07d CL |
215 | struct { |
216 | unsigned long bind_count, /* total number of binds */ | |
217 | connect_count, /* total number of connects */ | |
218 | connect_start, /* connect start timestamp */ | |
219 | connect_time, /* jiffies waiting for connect */ | |
220 | sends, /* how many complete requests */ | |
221 | recvs, /* how many complete requests */ | |
15a45206 AA |
222 | bad_xids, /* lookup_rqst didn't find XID */ |
223 | max_slots; /* max rpc_slots used */ | |
262ca07d CL |
224 | |
225 | unsigned long long req_u, /* average requests on the wire */ | |
15a45206 AA |
226 | bklog_u, /* backlog queue utilization */ |
227 | sending_u, /* send q utilization */ | |
228 | pending_u; /* pend q utilization */ | |
262ca07d | 229 | } stat; |
1da177e4 | 230 | |
37aa2133 | 231 | struct net *xprt_net; |
b454ae90 | 232 | const char *address_strings[RPC_DISPLAY_MAX]; |
1da177e4 LT |
233 | }; |
234 | ||
9e00abc3 | 235 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
56632b5b RL |
236 | /* |
237 | * Backchannel flags | |
238 | */ | |
239 | #define RPC_BC_PA_IN_USE 0x0001 /* Preallocated backchannel */ | |
240 | /* buffer in use */ | |
9e00abc3 | 241 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
56632b5b | 242 | |
9e00abc3 | 243 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
55ae1aab RL |
244 | static inline int bc_prealloc(struct rpc_rqst *req) |
245 | { | |
246 | return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state); | |
247 | } | |
248 | #else | |
249 | static inline int bc_prealloc(struct rpc_rqst *req) | |
250 | { | |
251 | return 0; | |
252 | } | |
9e00abc3 | 253 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
55ae1aab | 254 | |
3c341b0b | 255 | struct xprt_create { |
4fa016eb | 256 | int ident; /* XPRT_TRANSPORT identifier */ |
9a23e332 | 257 | struct net * net; |
d3bc9a1d | 258 | struct sockaddr * srcaddr; /* optional local address */ |
96802a09 FM |
259 | struct sockaddr * dstaddr; /* remote peer address */ |
260 | size_t addrlen; | |
f300baba | 261 | struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */ |
96802a09 | 262 | }; |
1da177e4 | 263 | |
81c098af TT |
264 | struct xprt_class { |
265 | struct list_head list; | |
4fa016eb | 266 | int ident; /* XPRT_TRANSPORT identifier */ |
3c341b0b | 267 | struct rpc_xprt * (*setup)(struct xprt_create *); |
81c098af TT |
268 | struct module *owner; |
269 | char name[32]; | |
270 | }; | |
271 | ||
55aa4f58 CL |
272 | /* |
273 | * Generic internal transport functions | |
274 | */ | |
3c341b0b | 275 | struct rpc_xprt *xprt_create_transport(struct xprt_create *args); |
55aa4f58 CL |
276 | void xprt_connect(struct rpc_task *task); |
277 | void xprt_reserve(struct rpc_task *task); | |
43cedbf0 TM |
278 | int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task); |
279 | int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task); | |
55aa4f58 CL |
280 | int xprt_prepare_transmit(struct rpc_task *task); |
281 | void xprt_transmit(struct rpc_task *task); | |
e0ab53de | 282 | void xprt_end_transmit(struct rpc_task *task); |
1da177e4 | 283 | int xprt_adjust_timeout(struct rpc_rqst *req); |
49e9a890 CL |
284 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task); |
285 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task); | |
55aa4f58 | 286 | void xprt_release(struct rpc_task *task); |
6b6ca86b TM |
287 | struct rpc_xprt * xprt_get(struct rpc_xprt *xprt); |
288 | void xprt_put(struct rpc_xprt *xprt); | |
d9ba131d TM |
289 | struct rpc_xprt * xprt_alloc(struct net *net, size_t size, |
290 | unsigned int num_prealloc, | |
291 | unsigned int max_req); | |
e204e621 | 292 | void xprt_free(struct rpc_xprt *); |
55aa4f58 | 293 | |
d8ed029d | 294 | static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p) |
808012fb CL |
295 | { |
296 | return p + xprt->tsh_size; | |
297 | } | |
298 | ||
55aa4f58 CL |
299 | /* |
300 | * Transport switch helper functions | |
301 | */ | |
81c098af TT |
302 | int xprt_register_transport(struct xprt_class *type); |
303 | int xprt_unregister_transport(struct xprt_class *type); | |
441e3e24 | 304 | int xprt_load_transport(const char *); |
fe3aca29 CL |
305 | void xprt_set_retrans_timeout_def(struct rpc_task *task); |
306 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task); | |
55aa4f58 | 307 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status); |
b6ddf64f | 308 | void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action); |
c7b2cae8 | 309 | void xprt_write_space(struct rpc_xprt *xprt); |
46c0ee8b | 310 | void xprt_adjust_cwnd(struct rpc_task *task, int result); |
d8ed029d | 311 | struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid); |
1570c1e4 | 312 | void xprt_complete_rqst(struct rpc_task *task, int copied); |
a58dd398 | 313 | void xprt_release_rqst_cong(struct rpc_task *task); |
62da3b24 | 314 | void xprt_disconnect_done(struct rpc_xprt *xprt); |
66af1e55 | 315 | void xprt_force_disconnect(struct rpc_xprt *xprt); |
7c1d71cf | 316 | void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie); |
55aa4f58 | 317 | |
2226feb6 CL |
318 | /* |
319 | * Reserved bit positions in xprt->state | |
320 | */ | |
321 | #define XPRT_LOCKED (0) | |
322 | #define XPRT_CONNECTED (1) | |
323 | #define XPRT_CONNECTING (2) | |
632e3bdc | 324 | #define XPRT_CLOSE_WAIT (3) |
ec739ef0 | 325 | #define XPRT_BOUND (4) |
4a68179d | 326 | #define XPRT_BINDING (5) |
3b948ae5 | 327 | #define XPRT_CLOSING (6) |
7d1e8255 | 328 | #define XPRT_CONNECTION_ABORT (7) |
f75e6745 | 329 | #define XPRT_CONNECTION_CLOSE (8) |
2226feb6 CL |
330 | |
331 | static inline void xprt_set_connected(struct rpc_xprt *xprt) | |
332 | { | |
333 | set_bit(XPRT_CONNECTED, &xprt->state); | |
334 | } | |
335 | ||
336 | static inline void xprt_clear_connected(struct rpc_xprt *xprt) | |
337 | { | |
338 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
339 | } | |
340 | ||
341 | static inline int xprt_connected(struct rpc_xprt *xprt) | |
342 | { | |
343 | return test_bit(XPRT_CONNECTED, &xprt->state); | |
344 | } | |
345 | ||
346 | static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt) | |
347 | { | |
348 | return test_and_set_bit(XPRT_CONNECTED, &xprt->state); | |
349 | } | |
350 | ||
351 | static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt) | |
352 | { | |
353 | return test_and_clear_bit(XPRT_CONNECTED, &xprt->state); | |
354 | } | |
355 | ||
356 | static inline void xprt_clear_connecting(struct rpc_xprt *xprt) | |
357 | { | |
358 | smp_mb__before_clear_bit(); | |
359 | clear_bit(XPRT_CONNECTING, &xprt->state); | |
360 | smp_mb__after_clear_bit(); | |
361 | } | |
362 | ||
363 | static inline int xprt_connecting(struct rpc_xprt *xprt) | |
364 | { | |
365 | return test_bit(XPRT_CONNECTING, &xprt->state); | |
366 | } | |
367 | ||
368 | static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt) | |
369 | { | |
370 | return test_and_set_bit(XPRT_CONNECTING, &xprt->state); | |
371 | } | |
1da177e4 | 372 | |
ec739ef0 CL |
373 | static inline void xprt_set_bound(struct rpc_xprt *xprt) |
374 | { | |
375 | test_and_set_bit(XPRT_BOUND, &xprt->state); | |
376 | } | |
377 | ||
378 | static inline int xprt_bound(struct rpc_xprt *xprt) | |
379 | { | |
380 | return test_bit(XPRT_BOUND, &xprt->state); | |
381 | } | |
382 | ||
383 | static inline void xprt_clear_bound(struct rpc_xprt *xprt) | |
384 | { | |
385 | clear_bit(XPRT_BOUND, &xprt->state); | |
386 | } | |
387 | ||
4a68179d CL |
388 | static inline void xprt_clear_binding(struct rpc_xprt *xprt) |
389 | { | |
390 | smp_mb__before_clear_bit(); | |
391 | clear_bit(XPRT_BINDING, &xprt->state); | |
392 | smp_mb__after_clear_bit(); | |
393 | } | |
394 | ||
395 | static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt) | |
396 | { | |
397 | return test_and_set_bit(XPRT_BINDING, &xprt->state); | |
398 | } | |
399 | ||
1da177e4 LT |
400 | #endif /* __KERNEL__*/ |
401 | ||
402 | #endif /* _LINUX_SUNRPC_XPRT_H */ |