The ps2esdi driver was marked as BROKEN more than two years ago due to being
[linux-2.6] / include / linux / sunrpc / xprt.h
1 /*
2  *  linux/include/linux/sunrpc/xprt.h
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/kref.h>
16 #include <linux/sunrpc/sched.h>
17 #include <linux/sunrpc/xdr.h>
18 #include <linux/sunrpc/msg_prot.h>
19
20 #ifdef __KERNEL__
21
22 #define RPC_MIN_SLOT_TABLE      (2U)
23 #define RPC_DEF_SLOT_TABLE      (16U)
24 #define RPC_MAX_SLOT_TABLE      (128U)
25
26 /*
27  * This describes a timeout strategy
28  */
29 struct rpc_timeout {
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;
35 };
36
37 enum rpc_display_format_t {
38         RPC_DISPLAY_ADDR = 0,
39         RPC_DISPLAY_PORT,
40         RPC_DISPLAY_PROTO,
41         RPC_DISPLAY_ALL,
42         RPC_DISPLAY_HEX_ADDR,
43         RPC_DISPLAY_HEX_PORT,
44         RPC_DISPLAY_UNIVERSAL_ADDR,
45         RPC_DISPLAY_NETID,
46         RPC_DISPLAY_MAX,
47 };
48
49 struct rpc_task;
50 struct rpc_xprt;
51 struct seq_file;
52
53 /*
54  * This describes a complete RPC request
55  */
56 struct rpc_rqst {
57         /*
58          * This is the user-visible part
59          */
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 */
63
64         /*
65          * This is the private part
66          */
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. */
72         int                     rq_enc_pages_num;
73         struct page             **rq_enc_pages; /* scratch pages for use by
74                                                    gss privacy code */
75         void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
76         struct list_head        rq_list;
77
78         __u32 *                 rq_buffer;      /* XDR encode buffer */
79         size_t                  rq_bufsize,
80                                 rq_callsize,
81                                 rq_rcvsize;
82
83         struct xdr_buf          rq_private_buf;         /* The receive buffer
84                                                          * used in the softirq.
85                                                          */
86         unsigned long           rq_majortimeo;  /* major timeout alarm */
87         unsigned long           rq_timeout;     /* Current timeout value */
88         unsigned int            rq_retries;     /* # of retries */
89         
90         /*
91          * Partial send handling
92          */
93         u32                     rq_bytes_sent;  /* Bytes we have sent */
94
95         unsigned long           rq_xtime;       /* when transmitted */
96         int                     rq_ntrans;
97 };
98 #define rq_svec                 rq_snd_buf.head
99 #define rq_slen                 rq_snd_buf.len
100
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);
117 };
118
119 struct rpc_xprt {
120         struct kref             kref;           /* Reference count */
121         struct rpc_xprt_ops *   ops;            /* transport methods */
122
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 */
127
128         unsigned long           cong;           /* current congestion */
129         unsigned long           cwnd;           /* congestion window */
130
131         size_t                  max_payload;    /* largest RPC payload size,
132                                                    in bytes */
133         unsigned int            tsh_size;       /* size of transport specific
134                                                    header */
135
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 */
148
149         /*
150          * Connection of transports
151          */
152         unsigned long           connect_timeout,
153                                 bind_timeout,
154                                 reestablish_timeout;
155
156         /*
157          * Disconnection of idle transports
158          */
159         struct work_struct      task_cleanup;
160         struct timer_list       timer;
161         unsigned long           last_used,
162                                 idle_timeout;
163
164         /*
165          * Send stuff
166          */
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;
172
173         struct {
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 */
181
182                 unsigned long long      req_u,          /* average requests on the wire */
183                                         bklog_u;        /* backlog queue utilization */
184         } stat;
185
186         const char              *address_strings[RPC_DISPLAY_MAX];
187 };
188
189 struct xprt_create {
190         int                     ident;          /* XPRT_TRANSPORT identifier */
191         struct sockaddr *       srcaddr;        /* optional local address */
192         struct sockaddr *       dstaddr;        /* remote peer address */
193         size_t                  addrlen;
194 };
195
196 struct xprt_class {
197         struct list_head        list;
198         int                     ident;          /* XPRT_TRANSPORT identifier */
199         struct rpc_xprt *       (*setup)(struct xprt_create *);
200         struct module           *owner;
201         char                    name[32];
202 };
203
204 /*
205  * Generic internal transport functions
206  */
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);
221
222 static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
223 {
224         return p + xprt->tsh_size;
225 }
226
227 /*
228  * Transport switch helper functions
229  */
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);
244
245 /*
246  * Reserved bit positions in xprt->state
247  */
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)
255
256 static inline void xprt_set_connected(struct rpc_xprt *xprt)
257 {
258         set_bit(XPRT_CONNECTED, &xprt->state);
259 }
260
261 static inline void xprt_clear_connected(struct rpc_xprt *xprt)
262 {
263         clear_bit(XPRT_CONNECTED, &xprt->state);
264 }
265
266 static inline int xprt_connected(struct rpc_xprt *xprt)
267 {
268         return test_bit(XPRT_CONNECTED, &xprt->state);
269 }
270
271 static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
272 {
273         return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
274 }
275
276 static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
277 {
278         return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
279 }
280
281 static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
282 {
283         smp_mb__before_clear_bit();
284         clear_bit(XPRT_CONNECTING, &xprt->state);
285         smp_mb__after_clear_bit();
286 }
287
288 static inline int xprt_connecting(struct rpc_xprt *xprt)
289 {
290         return test_bit(XPRT_CONNECTING, &xprt->state);
291 }
292
293 static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
294 {
295         return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
296 }
297
298 static inline void xprt_set_bound(struct rpc_xprt *xprt)
299 {
300         test_and_set_bit(XPRT_BOUND, &xprt->state);
301 }
302
303 static inline int xprt_bound(struct rpc_xprt *xprt)
304 {
305         return test_bit(XPRT_BOUND, &xprt->state);
306 }
307
308 static inline void xprt_clear_bound(struct rpc_xprt *xprt)
309 {
310         clear_bit(XPRT_BOUND, &xprt->state);
311 }
312
313 static inline void xprt_clear_binding(struct rpc_xprt *xprt)
314 {
315         smp_mb__before_clear_bit();
316         clear_bit(XPRT_BINDING, &xprt->state);
317         smp_mb__after_clear_bit();
318 }
319
320 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
321 {
322         return test_and_set_bit(XPRT_BINDING, &xprt->state);
323 }
324
325 #endif /* __KERNEL__*/
326
327 #endif /* _LINUX_SUNRPC_XPRT_H */