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Linux/include/linux/sunrpc/xprt.h

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  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/ktime.h>
 16 #include <linux/kref.h>
 17 #include <linux/sunrpc/sched.h>
 18 #include <linux/sunrpc/xdr.h>
 19 #include <linux/sunrpc/msg_prot.h>
 20 
 21 #ifdef __KERNEL__
 22 
 23 #define RPC_MIN_SLOT_TABLE      (2U)
 24 #define RPC_DEF_SLOT_TABLE      (16U)
 25 #define RPC_MAX_SLOT_TABLE_LIMIT        (65536U)
 26 #define RPC_MAX_SLOT_TABLE      RPC_MAX_SLOT_TABLE_LIMIT
 27 
 28 #define RPC_CWNDSHIFT           (8U)
 29 #define RPC_CWNDSCALE           (1U << RPC_CWNDSHIFT)
 30 #define RPC_INITCWND            RPC_CWNDSCALE
 31 #define RPC_MAXCWND(xprt)       ((xprt)->max_reqs << RPC_CWNDSHIFT)
 32 #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd)
 33 
 34 /*
 35  * This describes a timeout strategy
 36  */
 37 struct rpc_timeout {
 38         unsigned long           to_initval,             /* initial timeout */
 39                                 to_maxval,              /* max timeout */
 40                                 to_increment;           /* if !exponential */
 41         unsigned int            to_retries;             /* max # of retries */
 42         unsigned char           to_exponential;
 43 };
 44 
 45 enum rpc_display_format_t {
 46         RPC_DISPLAY_ADDR = 0,
 47         RPC_DISPLAY_PORT,
 48         RPC_DISPLAY_PROTO,
 49         RPC_DISPLAY_HEX_ADDR,
 50         RPC_DISPLAY_HEX_PORT,
 51         RPC_DISPLAY_NETID,
 52         RPC_DISPLAY_MAX,
 53 };
 54 
 55 struct rpc_task;
 56 struct rpc_xprt;
 57 struct seq_file;
 58 struct svc_serv;
 59 struct net;
 60 
 61 /*
 62  * This describes a complete RPC request
 63  */
 64 struct rpc_rqst {
 65         /*
 66          * This is the user-visible part
 67          */
 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 */
 71 
 72         /*
 73          * This is the private part
 74          */
 75         struct rpc_task *       rq_task;        /* RPC task data */
 76         struct rpc_cred *       rq_cred;        /* Bound cred */
 77         __be32                  rq_xid;         /* request XID */
 78         int                     rq_cong;        /* has incremented xprt->cong */
 79         u32                     rq_seqno;       /* gss seq no. used on req. */
 80         int                     rq_enc_pages_num;
 81         struct page             **rq_enc_pages; /* scratch pages for use by
 82                                                    gss privacy code */
 83         void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
 84         struct list_head        rq_list;
 85 
 86         __u32 *                 rq_buffer;      /* XDR encode buffer */
 87         size_t                  rq_callsize,
 88                                 rq_rcvsize;
 89         size_t                  rq_xmit_bytes_sent;     /* total bytes sent */
 90         size_t                  rq_reply_bytes_recvd;   /* total reply bytes */
 91                                                         /* received */
 92 
 93         struct xdr_buf          rq_private_buf;         /* The receive buffer
 94                                                          * used in the softirq.
 95                                                          */
 96         unsigned long           rq_majortimeo;  /* major timeout alarm */
 97         unsigned long           rq_timeout;     /* Current timeout value */
 98         ktime_t                 rq_rtt;         /* round-trip time */
 99         unsigned int            rq_retries;     /* # of retries */
100         unsigned int            rq_connect_cookie;
101                                                 /* A cookie used to track the
102                                                    state of the transport
103                                                    connection */
104         
105         /*
106          * Partial send handling
107          */
108         u32                     rq_bytes_sent;  /* Bytes we have sent */
109 
110         ktime_t                 rq_xtime;       /* transmit time stamp */
111         int                     rq_ntrans;
112 
113 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
114         struct list_head        rq_bc_list;     /* Callback service list */
115         unsigned long           rq_bc_pa_state; /* Backchannel prealloc state */
116         struct list_head        rq_bc_pa_list;  /* Backchannel prealloc list */
117 #endif /* CONFIG_SUNRPC_BACKCHANEL */
118 };
119 #define rq_svec                 rq_snd_buf.head
120 #define rq_slen                 rq_snd_buf.len
121 
122 struct rpc_xprt_ops {
123         void            (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
124         int             (*reserve_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
125         void            (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
126         void            (*alloc_slot)(struct rpc_xprt *xprt, struct rpc_task *task);
127         void            (*rpcbind)(struct rpc_task *task);
128         void            (*set_port)(struct rpc_xprt *xprt, unsigned short port);
129         void            (*connect)(struct rpc_xprt *xprt, struct rpc_task *task);
130         void *          (*buf_alloc)(struct rpc_task *task, size_t size);
131         void            (*buf_free)(void *buffer);
132         int             (*send_request)(struct rpc_task *task);
133         void            (*set_retrans_timeout)(struct rpc_task *task);
134         void            (*timer)(struct rpc_xprt *xprt, struct rpc_task *task);
135         void            (*release_request)(struct rpc_task *task);
136         void            (*close)(struct rpc_xprt *xprt);
137         void            (*destroy)(struct rpc_xprt *xprt);
138         void            (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
139         int             (*enable_swap)(struct rpc_xprt *xprt);
140         void            (*disable_swap)(struct rpc_xprt *xprt);
141         void            (*inject_disconnect)(struct rpc_xprt *xprt);
142         int             (*bc_setup)(struct rpc_xprt *xprt,
143                                     unsigned int min_reqs);
144         int             (*bc_up)(struct svc_serv *serv, struct net *net);
145         void            (*bc_free_rqst)(struct rpc_rqst *rqst);
146         void            (*bc_destroy)(struct rpc_xprt *xprt,
147                                       unsigned int max_reqs);
148 };
149 
150 /*
151  * RPC transport identifiers
152  *
153  * To preserve compatibility with the historical use of raw IP protocol
154  * id's for transport selection, UDP and TCP identifiers are specified
155  * with the previous values. No such restriction exists for new transports,
156  * except that they may not collide with these values (17 and 6,
157  * respectively).
158  */
159 #define XPRT_TRANSPORT_BC       (1 << 31)
160 enum xprt_transports {
161         XPRT_TRANSPORT_UDP      = IPPROTO_UDP,
162         XPRT_TRANSPORT_TCP      = IPPROTO_TCP,
163         XPRT_TRANSPORT_BC_TCP   = IPPROTO_TCP | XPRT_TRANSPORT_BC,
164         XPRT_TRANSPORT_RDMA     = 256,
165         XPRT_TRANSPORT_BC_RDMA  = XPRT_TRANSPORT_RDMA | XPRT_TRANSPORT_BC,
166         XPRT_TRANSPORT_LOCAL    = 257,
167 };
168 
169 struct rpc_xprt {
170         struct kref             kref;           /* Reference count */
171         struct rpc_xprt_ops *   ops;            /* transport methods */
172 
173         const struct rpc_timeout *timeout;      /* timeout parms */
174         struct sockaddr_storage addr;           /* server address */
175         size_t                  addrlen;        /* size of server address */
176         int                     prot;           /* IP protocol */
177 
178         unsigned long           cong;           /* current congestion */
179         unsigned long           cwnd;           /* congestion window */
180 
181         size_t                  max_payload;    /* largest RPC payload size,
182                                                    in bytes */
183         unsigned int            tsh_size;       /* size of transport specific
184                                                    header */
185 
186         struct rpc_wait_queue   binding;        /* requests waiting on rpcbind */
187         struct rpc_wait_queue   sending;        /* requests waiting to send */
188         struct rpc_wait_queue   pending;        /* requests in flight */
189         struct rpc_wait_queue   backlog;        /* waiting for slot */
190         struct list_head        free;           /* free slots */
191         unsigned int            max_reqs;       /* max number of slots */
192         unsigned int            min_reqs;       /* min number of slots */
193         atomic_t                num_reqs;       /* total slots */
194         unsigned long           state;          /* transport state */
195         unsigned char           resvport   : 1; /* use a reserved port */
196         atomic_t                swapper;        /* we're swapping over this
197                                                    transport */
198         unsigned int            bind_index;     /* bind function index */
199 
200         /*
201          * Multipath
202          */
203         struct list_head        xprt_switch;
204 
205         /*
206          * Connection of transports
207          */
208         unsigned long           bind_timeout,
209                                 reestablish_timeout;
210         unsigned int            connect_cookie; /* A cookie that gets bumped
211                                                    every time the transport
212                                                    is reconnected */
213 
214         /*
215          * Disconnection of idle transports
216          */
217         struct work_struct      task_cleanup;
218         struct timer_list       timer;
219         unsigned long           last_used,
220                                 idle_timeout;
221 
222         /*
223          * Send stuff
224          */
225         spinlock_t              transport_lock; /* lock transport info */
226         spinlock_t              reserve_lock;   /* lock slot table */
227         u32                     xid;            /* Next XID value to use */
228         struct rpc_task *       snd_task;       /* Task blocked in send */
229         struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
230 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
231         struct svc_serv         *bc_serv;       /* The RPC service which will */
232                                                 /* process the callback */
233         int                     bc_alloc_count; /* Total number of preallocs */
234         atomic_t                bc_free_slots;
235         spinlock_t              bc_pa_lock;     /* Protects the preallocated
236                                                  * items */
237         struct list_head        bc_pa_list;     /* List of preallocated
238                                                  * backchannel rpc_rqst's */
239 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
240         struct list_head        recv;
241 
242         struct {
243                 unsigned long           bind_count,     /* total number of binds */
244                                         connect_count,  /* total number of connects */
245                                         connect_start,  /* connect start timestamp */
246                                         connect_time,   /* jiffies waiting for connect */
247                                         sends,          /* how many complete requests */
248                                         recvs,          /* how many complete requests */
249                                         bad_xids,       /* lookup_rqst didn't find XID */
250                                         max_slots;      /* max rpc_slots used */
251 
252                 unsigned long long      req_u,          /* average requests on the wire */
253                                         bklog_u,        /* backlog queue utilization */
254                                         sending_u,      /* send q utilization */
255                                         pending_u;      /* pend q utilization */
256         } stat;
257 
258         struct net              *xprt_net;
259         const char              *servername;
260         const char              *address_strings[RPC_DISPLAY_MAX];
261 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
262         struct dentry           *debugfs;               /* debugfs directory */
263         atomic_t                inject_disconnect;
264 #endif
265         struct rcu_head         rcu;
266 };
267 
268 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
269 /*
270  * Backchannel flags
271  */
272 #define RPC_BC_PA_IN_USE        0x0001          /* Preallocated backchannel */
273                                                 /* buffer in use */
274 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
275 
276 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
277 static inline int bc_prealloc(struct rpc_rqst *req)
278 {
279         return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
280 }
281 #else
282 static inline int bc_prealloc(struct rpc_rqst *req)
283 {
284         return 0;
285 }
286 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
287 
288 #define XPRT_CREATE_INFINITE_SLOTS      (1U)
289 #define XPRT_CREATE_NO_IDLE_TIMEOUT     (1U << 1)
290 
291 struct xprt_create {
292         int                     ident;          /* XPRT_TRANSPORT identifier */
293         struct net *            net;
294         struct sockaddr *       srcaddr;        /* optional local address */
295         struct sockaddr *       dstaddr;        /* remote peer address */
296         size_t                  addrlen;
297         const char              *servername;
298         struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
299         struct rpc_xprt_switch  *bc_xps;
300         unsigned int            flags;
301 };
302 
303 struct xprt_class {
304         struct list_head        list;
305         int                     ident;          /* XPRT_TRANSPORT identifier */
306         struct rpc_xprt *       (*setup)(struct xprt_create *);
307         struct module           *owner;
308         char                    name[32];
309 };
310 
311 /*
312  * Generic internal transport functions
313  */
314 struct rpc_xprt         *xprt_create_transport(struct xprt_create *args);
315 void                    xprt_connect(struct rpc_task *task);
316 void                    xprt_reserve(struct rpc_task *task);
317 void                    xprt_retry_reserve(struct rpc_task *task);
318 int                     xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
319 int                     xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
320 void                    xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
321 void                    xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
322 bool                    xprt_prepare_transmit(struct rpc_task *task);
323 void                    xprt_transmit(struct rpc_task *task);
324 void                    xprt_end_transmit(struct rpc_task *task);
325 int                     xprt_adjust_timeout(struct rpc_rqst *req);
326 void                    xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
327 void                    xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
328 void                    xprt_release(struct rpc_task *task);
329 struct rpc_xprt *       xprt_get(struct rpc_xprt *xprt);
330 void                    xprt_put(struct rpc_xprt *xprt);
331 struct rpc_xprt *       xprt_alloc(struct net *net, size_t size,
332                                 unsigned int num_prealloc,
333                                 unsigned int max_req);
334 void                    xprt_free(struct rpc_xprt *);
335 
336 static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
337 {
338         return p + xprt->tsh_size;
339 }
340 
341 static inline int
342 xprt_enable_swap(struct rpc_xprt *xprt)
343 {
344         return xprt->ops->enable_swap(xprt);
345 }
346 
347 static inline void
348 xprt_disable_swap(struct rpc_xprt *xprt)
349 {
350         xprt->ops->disable_swap(xprt);
351 }
352 
353 /*
354  * Transport switch helper functions
355  */
356 int                     xprt_register_transport(struct xprt_class *type);
357 int                     xprt_unregister_transport(struct xprt_class *type);
358 int                     xprt_load_transport(const char *);
359 void                    xprt_set_retrans_timeout_def(struct rpc_task *task);
360 void                    xprt_set_retrans_timeout_rtt(struct rpc_task *task);
361 void                    xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
362 void                    xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action);
363 void                    xprt_write_space(struct rpc_xprt *xprt);
364 void                    xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result);
365 struct rpc_rqst *       xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
366 void                    xprt_complete_rqst(struct rpc_task *task, int copied);
367 void                    xprt_release_rqst_cong(struct rpc_task *task);
368 void                    xprt_disconnect_done(struct rpc_xprt *xprt);
369 void                    xprt_force_disconnect(struct rpc_xprt *xprt);
370 void                    xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
371 
372 bool                    xprt_lock_connect(struct rpc_xprt *, struct rpc_task *, void *);
373 void                    xprt_unlock_connect(struct rpc_xprt *, void *);
374 
375 /*
376  * Reserved bit positions in xprt->state
377  */
378 #define XPRT_LOCKED             (0)
379 #define XPRT_CONNECTED          (1)
380 #define XPRT_CONNECTING         (2)
381 #define XPRT_CLOSE_WAIT         (3)
382 #define XPRT_BOUND              (4)
383 #define XPRT_BINDING            (5)
384 #define XPRT_CLOSING            (6)
385 #define XPRT_CONGESTED          (9)
386 
387 static inline void xprt_set_connected(struct rpc_xprt *xprt)
388 {
389         set_bit(XPRT_CONNECTED, &xprt->state);
390 }
391 
392 static inline void xprt_clear_connected(struct rpc_xprt *xprt)
393 {
394         clear_bit(XPRT_CONNECTED, &xprt->state);
395 }
396 
397 static inline int xprt_connected(struct rpc_xprt *xprt)
398 {
399         return test_bit(XPRT_CONNECTED, &xprt->state);
400 }
401 
402 static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
403 {
404         return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
405 }
406 
407 static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
408 {
409         return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
410 }
411 
412 static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
413 {
414         smp_mb__before_atomic();
415         clear_bit(XPRT_CONNECTING, &xprt->state);
416         smp_mb__after_atomic();
417 }
418 
419 static inline int xprt_connecting(struct rpc_xprt *xprt)
420 {
421         return test_bit(XPRT_CONNECTING, &xprt->state);
422 }
423 
424 static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
425 {
426         return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
427 }
428 
429 static inline void xprt_set_bound(struct rpc_xprt *xprt)
430 {
431         test_and_set_bit(XPRT_BOUND, &xprt->state);
432 }
433 
434 static inline int xprt_bound(struct rpc_xprt *xprt)
435 {
436         return test_bit(XPRT_BOUND, &xprt->state);
437 }
438 
439 static inline void xprt_clear_bound(struct rpc_xprt *xprt)
440 {
441         clear_bit(XPRT_BOUND, &xprt->state);
442 }
443 
444 static inline void xprt_clear_binding(struct rpc_xprt *xprt)
445 {
446         smp_mb__before_atomic();
447         clear_bit(XPRT_BINDING, &xprt->state);
448         smp_mb__after_atomic();
449 }
450 
451 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
452 {
453         return test_and_set_bit(XPRT_BINDING, &xprt->state);
454 }
455 
456 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
457 extern unsigned int rpc_inject_disconnect;
458 static inline void xprt_inject_disconnect(struct rpc_xprt *xprt)
459 {
460         if (!rpc_inject_disconnect)
461                 return;
462         if (atomic_dec_return(&xprt->inject_disconnect))
463                 return;
464         atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect);
465         xprt->ops->inject_disconnect(xprt);
466 }
467 #else
468 static inline void xprt_inject_disconnect(struct rpc_xprt *xprt)
469 {
470 }
471 #endif
472 
473 #endif /* __KERNEL__*/
474 
475 #endif /* _LINUX_SUNRPC_XPRT_H */
476 

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