2 * linux/net/sunrpc/svc.c
4 * High-level RPC service routines
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
8 * Multiple threads pools and NUMAisation
9 * Copyright (c) 2006 Silicon Graphics, Inc.
10 * by Greg Banks <gnb@melbourne.sgi.com>
13 #include <linux/linkage.h>
14 #include <linux/sched.h>
15 #include <linux/errno.h>
16 #include <linux/net.h>
19 #include <linux/interrupt.h>
20 #include <linux/module.h>
22 #include <linux/sunrpc/types.h>
23 #include <linux/sunrpc/xdr.h>
24 #include <linux/sunrpc/stats.h>
25 #include <linux/sunrpc/svcsock.h>
26 #include <linux/sunrpc/clnt.h>
28 #define RPCDBG_FACILITY RPCDBG_SVCDSP
31 * Mode for mapping cpus to pools.
34 SVC_POOL_NONE
= -1, /* uninitialised, choose one of the others */
35 SVC_POOL_GLOBAL
, /* no mapping, just a single global pool
36 * (legacy & UP mode) */
37 SVC_POOL_PERCPU
, /* one pool per cpu */
38 SVC_POOL_PERNODE
/* one pool per numa node */
42 * Structure for mapping cpus to pools and vice versa.
43 * Setup once during sunrpc initialisation.
45 static struct svc_pool_map
{
46 int mode
; /* Note: int not enum to avoid
47 * warnings about "enumeration value
48 * not handled in switch" */
50 unsigned int *pool_to
; /* maps pool id to cpu or node */
51 unsigned int *to_pool
; /* maps cpu or node to pool id */
58 * Detect best pool mapping mode heuristically,
59 * according to the machine's topology.
62 svc_pool_map_choose_mode(void)
66 if (num_online_nodes() > 1) {
68 * Actually have multiple NUMA nodes,
69 * so split pools on NUMA node boundaries
71 return SVC_POOL_PERNODE
;
74 node
= any_online_node(node_online_map
);
75 if (nr_cpus_node(node
) > 2) {
77 * Non-trivial SMP, or CONFIG_NUMA on
78 * non-NUMA hardware, e.g. with a generic
79 * x86_64 kernel on Xeons. In this case we
80 * want to divide the pools on cpu boundaries.
82 return SVC_POOL_PERCPU
;
85 /* default: one global pool */
86 return SVC_POOL_GLOBAL
;
90 * Allocate the to_pool[] and pool_to[] arrays.
91 * Returns 0 on success or an errno.
94 svc_pool_map_alloc_arrays(struct svc_pool_map
*m
, unsigned int maxpools
)
96 m
->to_pool
= kcalloc(maxpools
, sizeof(unsigned int), GFP_KERNEL
);
99 m
->pool_to
= kcalloc(maxpools
, sizeof(unsigned int), GFP_KERNEL
);
112 * Initialise the pool map for SVC_POOL_PERCPU mode.
113 * Returns number of pools or <0 on error.
116 svc_pool_map_init_percpu(struct svc_pool_map
*m
)
118 unsigned int maxpools
= nr_cpu_ids
;
119 unsigned int pidx
= 0;
123 err
= svc_pool_map_alloc_arrays(m
, maxpools
);
127 for_each_online_cpu(cpu
) {
128 BUG_ON(pidx
> maxpools
);
129 m
->to_pool
[cpu
] = pidx
;
130 m
->pool_to
[pidx
] = cpu
;
133 /* cpus brought online later all get mapped to pool0, sorry */
140 * Initialise the pool map for SVC_POOL_PERNODE mode.
141 * Returns number of pools or <0 on error.
144 svc_pool_map_init_pernode(struct svc_pool_map
*m
)
146 unsigned int maxpools
= nr_node_ids
;
147 unsigned int pidx
= 0;
151 err
= svc_pool_map_alloc_arrays(m
, maxpools
);
155 for_each_node_with_cpus(node
) {
156 /* some architectures (e.g. SN2) have cpuless nodes */
157 BUG_ON(pidx
> maxpools
);
158 m
->to_pool
[node
] = pidx
;
159 m
->pool_to
[pidx
] = node
;
162 /* nodes brought online later all get mapped to pool0, sorry */
169 * Build the global map of cpus to pools and vice versa.
172 svc_pool_map_init(void)
174 struct svc_pool_map
*m
= &svc_pool_map
;
177 if (m
->mode
!= SVC_POOL_NONE
)
180 m
->mode
= svc_pool_map_choose_mode();
183 case SVC_POOL_PERCPU
:
184 npools
= svc_pool_map_init_percpu(m
);
186 case SVC_POOL_PERNODE
:
187 npools
= svc_pool_map_init_pernode(m
);
192 /* default, or memory allocation failure */
194 m
->mode
= SVC_POOL_GLOBAL
;
202 * Set the current thread's cpus_allowed mask so that it
203 * will only run on cpus in the given pool.
205 * Returns 1 and fills in oldmask iff a cpumask was applied.
208 svc_pool_map_set_cpumask(unsigned int pidx
, cpumask_t
*oldmask
)
210 struct svc_pool_map
*m
= &svc_pool_map
;
211 unsigned int node
; /* or cpu */
214 * The caller checks for sv_nrpools > 1, which
215 * implies that we've been initialized and the
216 * map mode is not NONE.
218 BUG_ON(m
->mode
== SVC_POOL_NONE
);
224 case SVC_POOL_PERCPU
:
225 node
= m
->pool_to
[pidx
];
226 *oldmask
= current
->cpus_allowed
;
227 set_cpus_allowed(current
, cpumask_of_cpu(node
));
229 case SVC_POOL_PERNODE
:
230 node
= m
->pool_to
[pidx
];
231 *oldmask
= current
->cpus_allowed
;
232 set_cpus_allowed(current
, node_to_cpumask(node
));
238 * Use the mapping mode to choose a pool for a given CPU.
239 * Used when enqueueing an incoming RPC. Always returns
240 * a non-NULL pool pointer.
243 svc_pool_for_cpu(struct svc_serv
*serv
, int cpu
)
245 struct svc_pool_map
*m
= &svc_pool_map
;
246 unsigned int pidx
= 0;
249 * SVC_POOL_NONE happens in a pure client when
250 * lockd is brought up, so silently treat it the
251 * same as SVC_POOL_GLOBAL.
255 case SVC_POOL_PERCPU
:
256 pidx
= m
->to_pool
[cpu
];
258 case SVC_POOL_PERNODE
:
259 pidx
= m
->to_pool
[cpu_to_node(cpu
)];
262 return &serv
->sv_pools
[pidx
% serv
->sv_nrpools
];
267 * Create an RPC service
269 static struct svc_serv
*
270 __svc_create(struct svc_program
*prog
, unsigned int bufsize
, int npools
,
271 void (*shutdown
)(struct svc_serv
*serv
))
273 struct svc_serv
*serv
;
275 unsigned int xdrsize
;
278 if (!(serv
= kzalloc(sizeof(*serv
), GFP_KERNEL
)))
280 serv
->sv_name
= prog
->pg_name
;
281 serv
->sv_program
= prog
;
282 serv
->sv_nrthreads
= 1;
283 serv
->sv_stats
= prog
->pg_stats
;
284 if (bufsize
> RPCSVC_MAXPAYLOAD
)
285 bufsize
= RPCSVC_MAXPAYLOAD
;
286 serv
->sv_max_payload
= bufsize
? bufsize
: 4096;
287 serv
->sv_max_mesg
= roundup(serv
->sv_max_payload
+ PAGE_SIZE
, PAGE_SIZE
);
288 serv
->sv_shutdown
= shutdown
;
291 prog
->pg_lovers
= prog
->pg_nvers
-1;
292 for (vers
=0; vers
<prog
->pg_nvers
; vers
++)
293 if (prog
->pg_vers
[vers
]) {
294 prog
->pg_hivers
= vers
;
295 if (prog
->pg_lovers
> vers
)
296 prog
->pg_lovers
= vers
;
297 if (prog
->pg_vers
[vers
]->vs_xdrsize
> xdrsize
)
298 xdrsize
= prog
->pg_vers
[vers
]->vs_xdrsize
;
300 prog
= prog
->pg_next
;
302 serv
->sv_xdrsize
= xdrsize
;
303 INIT_LIST_HEAD(&serv
->sv_tempsocks
);
304 INIT_LIST_HEAD(&serv
->sv_permsocks
);
305 init_timer(&serv
->sv_temptimer
);
306 spin_lock_init(&serv
->sv_lock
);
308 serv
->sv_nrpools
= npools
;
310 kcalloc(serv
->sv_nrpools
, sizeof(struct svc_pool
),
312 if (!serv
->sv_pools
) {
317 for (i
= 0; i
< serv
->sv_nrpools
; i
++) {
318 struct svc_pool
*pool
= &serv
->sv_pools
[i
];
320 dprintk("svc: initialising pool %u for %s\n",
324 INIT_LIST_HEAD(&pool
->sp_threads
);
325 INIT_LIST_HEAD(&pool
->sp_sockets
);
326 INIT_LIST_HEAD(&pool
->sp_all_threads
);
327 spin_lock_init(&pool
->sp_lock
);
331 /* Remove any stale portmap registrations */
332 svc_register(serv
, 0, 0);
338 svc_create(struct svc_program
*prog
, unsigned int bufsize
,
339 void (*shutdown
)(struct svc_serv
*serv
))
341 return __svc_create(prog
, bufsize
, /*npools*/1, shutdown
);
345 svc_create_pooled(struct svc_program
*prog
, unsigned int bufsize
,
346 void (*shutdown
)(struct svc_serv
*serv
),
347 svc_thread_fn func
, int sig
, struct module
*mod
)
349 struct svc_serv
*serv
;
350 unsigned int npools
= svc_pool_map_init();
352 serv
= __svc_create(prog
, bufsize
, npools
, shutdown
);
355 serv
->sv_function
= func
;
356 serv
->sv_kill_signal
= sig
;
357 serv
->sv_module
= mod
;
364 * Destroy an RPC service. Should be called with the BKL held
367 svc_destroy(struct svc_serv
*serv
)
369 struct svc_sock
*svsk
;
370 struct svc_sock
*tmp
;
372 dprintk("svc: svc_destroy(%s, %d)\n",
373 serv
->sv_program
->pg_name
,
376 if (serv
->sv_nrthreads
) {
377 if (--(serv
->sv_nrthreads
) != 0) {
378 svc_sock_update_bufs(serv
);
382 printk("svc_destroy: no threads for serv=%p!\n", serv
);
384 del_timer_sync(&serv
->sv_temptimer
);
386 list_for_each_entry_safe(svsk
, tmp
, &serv
->sv_tempsocks
, sk_list
)
387 svc_force_close_socket(svsk
);
389 if (serv
->sv_shutdown
)
390 serv
->sv_shutdown(serv
);
392 list_for_each_entry_safe(svsk
, tmp
, &serv
->sv_permsocks
, sk_list
)
393 svc_force_close_socket(svsk
);
395 BUG_ON(!list_empty(&serv
->sv_permsocks
));
396 BUG_ON(!list_empty(&serv
->sv_tempsocks
));
398 cache_clean_deferred(serv
);
400 /* Unregister service with the portmapper */
401 svc_register(serv
, 0, 0);
402 kfree(serv
->sv_pools
);
407 * Allocate an RPC server's buffer space.
408 * We allocate pages and place them in rq_argpages.
411 svc_init_buffer(struct svc_rqst
*rqstp
, unsigned int size
)
416 pages
= size
/ PAGE_SIZE
+ 1; /* extra page as we hold both request and reply.
417 * We assume one is at most one page
420 BUG_ON(pages
> RPCSVC_MAXPAGES
);
422 struct page
*p
= alloc_page(GFP_KERNEL
);
425 rqstp
->rq_pages
[arghi
++] = p
;
432 * Release an RPC server buffer
435 svc_release_buffer(struct svc_rqst
*rqstp
)
438 for (i
=0; i
<ARRAY_SIZE(rqstp
->rq_pages
); i
++)
439 if (rqstp
->rq_pages
[i
])
440 put_page(rqstp
->rq_pages
[i
]);
444 * Create a thread in the given pool. Caller must hold BKL.
445 * On a NUMA or SMP machine, with a multi-pool serv, the thread
446 * will be restricted to run on the cpus belonging to the pool.
449 __svc_create_thread(svc_thread_fn func
, struct svc_serv
*serv
,
450 struct svc_pool
*pool
)
452 struct svc_rqst
*rqstp
;
454 int have_oldmask
= 0;
457 rqstp
= kzalloc(sizeof(*rqstp
), GFP_KERNEL
);
461 init_waitqueue_head(&rqstp
->rq_wait
);
463 if (!(rqstp
->rq_argp
= kmalloc(serv
->sv_xdrsize
, GFP_KERNEL
))
464 || !(rqstp
->rq_resp
= kmalloc(serv
->sv_xdrsize
, GFP_KERNEL
))
465 || !svc_init_buffer(rqstp
, serv
->sv_max_mesg
))
468 serv
->sv_nrthreads
++;
469 spin_lock_bh(&pool
->sp_lock
);
470 pool
->sp_nrthreads
++;
471 list_add(&rqstp
->rq_all
, &pool
->sp_all_threads
);
472 spin_unlock_bh(&pool
->sp_lock
);
473 rqstp
->rq_server
= serv
;
474 rqstp
->rq_pool
= pool
;
476 if (serv
->sv_nrpools
> 1)
477 have_oldmask
= svc_pool_map_set_cpumask(pool
->sp_id
, &oldmask
);
479 error
= kernel_thread((int (*)(void *)) func
, rqstp
, 0);
482 set_cpus_allowed(current
, oldmask
);
486 svc_sock_update_bufs(serv
);
492 svc_exit_thread(rqstp
);
497 * Create a thread in the default pool. Caller must hold BKL.
500 svc_create_thread(svc_thread_fn func
, struct svc_serv
*serv
)
502 return __svc_create_thread(func
, serv
, &serv
->sv_pools
[0]);
506 * Choose a pool in which to create a new thread, for svc_set_num_threads
508 static inline struct svc_pool
*
509 choose_pool(struct svc_serv
*serv
, struct svc_pool
*pool
, unsigned int *state
)
514 return &serv
->sv_pools
[(*state
)++ % serv
->sv_nrpools
];
518 * Choose a thread to kill, for svc_set_num_threads
520 static inline struct task_struct
*
521 choose_victim(struct svc_serv
*serv
, struct svc_pool
*pool
, unsigned int *state
)
524 struct task_struct
*task
= NULL
;
527 spin_lock_bh(&pool
->sp_lock
);
529 /* choose a pool in round-robin fashion */
530 for (i
= 0; i
< serv
->sv_nrpools
; i
++) {
531 pool
= &serv
->sv_pools
[--(*state
) % serv
->sv_nrpools
];
532 spin_lock_bh(&pool
->sp_lock
);
533 if (!list_empty(&pool
->sp_all_threads
))
535 spin_unlock_bh(&pool
->sp_lock
);
541 if (!list_empty(&pool
->sp_all_threads
)) {
542 struct svc_rqst
*rqstp
;
545 * Remove from the pool->sp_all_threads list
546 * so we don't try to kill it again.
548 rqstp
= list_entry(pool
->sp_all_threads
.next
, struct svc_rqst
, rq_all
);
549 list_del_init(&rqstp
->rq_all
);
550 task
= rqstp
->rq_task
;
552 spin_unlock_bh(&pool
->sp_lock
);
558 * Create or destroy enough new threads to make the number
559 * of threads the given number. If `pool' is non-NULL, applies
560 * only to threads in that pool, otherwise round-robins between
561 * all pools. Must be called with a svc_get() reference and
564 * Destroying threads relies on the service threads filling in
565 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
566 * has been created using svc_create_pooled().
568 * Based on code that used to be in nfsd_svc() but tweaked
572 svc_set_num_threads(struct svc_serv
*serv
, struct svc_pool
*pool
, int nrservs
)
574 struct task_struct
*victim
;
576 unsigned int state
= serv
->sv_nrthreads
-1;
579 /* The -1 assumes caller has done a svc_get() */
580 nrservs
-= (serv
->sv_nrthreads
-1);
582 spin_lock_bh(&pool
->sp_lock
);
583 nrservs
-= pool
->sp_nrthreads
;
584 spin_unlock_bh(&pool
->sp_lock
);
587 /* create new threads */
588 while (nrservs
> 0) {
590 __module_get(serv
->sv_module
);
591 error
= __svc_create_thread(serv
->sv_function
, serv
,
592 choose_pool(serv
, pool
, &state
));
594 module_put(serv
->sv_module
);
598 /* destroy old threads */
599 while (nrservs
< 0 &&
600 (victim
= choose_victim(serv
, pool
, &state
)) != NULL
) {
601 send_sig(serv
->sv_kill_signal
, victim
, 1);
609 * Called from a server thread as it's exiting. Caller must hold BKL.
612 svc_exit_thread(struct svc_rqst
*rqstp
)
614 struct svc_serv
*serv
= rqstp
->rq_server
;
615 struct svc_pool
*pool
= rqstp
->rq_pool
;
617 svc_release_buffer(rqstp
);
618 kfree(rqstp
->rq_resp
);
619 kfree(rqstp
->rq_argp
);
620 kfree(rqstp
->rq_auth_data
);
622 spin_lock_bh(&pool
->sp_lock
);
623 pool
->sp_nrthreads
--;
624 list_del(&rqstp
->rq_all
);
625 spin_unlock_bh(&pool
->sp_lock
);
629 /* Release the server */
635 * Register an RPC service with the local portmapper.
636 * To unregister a service, call this routine with
637 * proto and port == 0.
640 svc_register(struct svc_serv
*serv
, int proto
, unsigned short port
)
642 struct svc_program
*progp
;
644 int i
, error
= 0, dummy
;
647 clear_thread_flag(TIF_SIGPENDING
);
649 for (progp
= serv
->sv_program
; progp
; progp
= progp
->pg_next
) {
650 for (i
= 0; i
< progp
->pg_nvers
; i
++) {
651 if (progp
->pg_vers
[i
] == NULL
)
654 dprintk("svc: svc_register(%s, %s, %d, %d)%s\n",
656 proto
== IPPROTO_UDP
? "udp" : "tcp",
659 progp
->pg_vers
[i
]->vs_hidden
?
660 " (but not telling portmap)" : "");
662 if (progp
->pg_vers
[i
]->vs_hidden
)
665 error
= rpc_register(progp
->pg_prog
, i
, proto
, port
, &dummy
);
668 if (port
&& !dummy
) {
676 spin_lock_irqsave(¤t
->sighand
->siglock
, flags
);
678 spin_unlock_irqrestore(¤t
->sighand
->siglock
, flags
);
685 * Process the RPC request.
688 svc_process(struct svc_rqst
*rqstp
)
690 struct svc_program
*progp
;
691 struct svc_version
*versp
= NULL
; /* compiler food */
692 struct svc_procedure
*procp
= NULL
;
693 struct kvec
* argv
= &rqstp
->rq_arg
.head
[0];
694 struct kvec
* resv
= &rqstp
->rq_res
.head
[0];
695 struct svc_serv
*serv
= rqstp
->rq_server
;
698 u32 dir
, prog
, vers
, proc
;
699 __be32 auth_stat
, rpc_stat
;
703 rpc_stat
= rpc_success
;
705 if (argv
->iov_len
< 6*4)
708 /* setup response xdr_buf.
709 * Initially it has just one page
711 rqstp
->rq_resused
= 1;
712 resv
->iov_base
= page_address(rqstp
->rq_respages
[0]);
714 rqstp
->rq_res
.pages
= rqstp
->rq_respages
+ 1;
715 rqstp
->rq_res
.len
= 0;
716 rqstp
->rq_res
.page_base
= 0;
717 rqstp
->rq_res
.page_len
= 0;
718 rqstp
->rq_res
.buflen
= PAGE_SIZE
;
719 rqstp
->rq_res
.tail
[0].iov_base
= NULL
;
720 rqstp
->rq_res
.tail
[0].iov_len
= 0;
721 /* Will be turned off only in gss privacy case: */
722 rqstp
->rq_sendfile_ok
= 1;
723 /* tcp needs a space for the record length... */
724 if (rqstp
->rq_prot
== IPPROTO_TCP
)
727 rqstp
->rq_xid
= svc_getu32(argv
);
728 svc_putu32(resv
, rqstp
->rq_xid
);
730 dir
= svc_getnl(argv
);
731 vers
= svc_getnl(argv
);
733 /* First words of reply: */
734 svc_putnl(resv
, 1); /* REPLY */
736 if (dir
!= 0) /* direction != CALL */
738 if (vers
!= 2) /* RPC version number */
741 /* Save position in case we later decide to reject: */
742 reply_statp
= resv
->iov_base
+ resv
->iov_len
;
744 svc_putnl(resv
, 0); /* ACCEPT */
746 rqstp
->rq_prog
= prog
= svc_getnl(argv
); /* program number */
747 rqstp
->rq_vers
= vers
= svc_getnl(argv
); /* version number */
748 rqstp
->rq_proc
= proc
= svc_getnl(argv
); /* procedure number */
750 progp
= serv
->sv_program
;
752 for (progp
= serv
->sv_program
; progp
; progp
= progp
->pg_next
)
753 if (prog
== progp
->pg_prog
)
757 * Decode auth data, and add verifier to reply buffer.
758 * We do this before anything else in order to get a decent
761 auth_res
= svc_authenticate(rqstp
, &auth_stat
);
762 /* Also give the program a chance to reject this call: */
763 if (auth_res
== SVC_OK
&& progp
) {
764 auth_stat
= rpc_autherr_badcred
;
765 auth_res
= progp
->pg_authenticate(rqstp
);
771 rpc_stat
= rpc_garbage_args
;
774 rpc_stat
= rpc_system_err
;
787 if (vers
>= progp
->pg_nvers
||
788 !(versp
= progp
->pg_vers
[vers
]))
791 procp
= versp
->vs_proc
+ proc
;
792 if (proc
>= versp
->vs_nproc
|| !procp
->pc_func
)
794 rqstp
->rq_server
= serv
;
795 rqstp
->rq_procinfo
= procp
;
797 /* Syntactic check complete */
798 serv
->sv_stats
->rpccnt
++;
800 /* Build the reply header. */
801 statp
= resv
->iov_base
+resv
->iov_len
;
802 svc_putnl(resv
, RPC_SUCCESS
);
804 /* Bump per-procedure stats counter */
807 /* Initialize storage for argp and resp */
808 memset(rqstp
->rq_argp
, 0, procp
->pc_argsize
);
809 memset(rqstp
->rq_resp
, 0, procp
->pc_ressize
);
811 /* un-reserve some of the out-queue now that we have a
812 * better idea of reply size
814 if (procp
->pc_xdrressize
)
815 svc_reserve(rqstp
, procp
->pc_xdrressize
<<2);
817 /* Call the function that processes the request. */
818 if (!versp
->vs_dispatch
) {
819 /* Decode arguments */
820 xdr
= procp
->pc_decode
;
821 if (xdr
&& !xdr(rqstp
, argv
->iov_base
, rqstp
->rq_argp
))
824 *statp
= procp
->pc_func(rqstp
, rqstp
->rq_argp
, rqstp
->rq_resp
);
827 if (*statp
== rpc_drop_reply
) {
828 if (procp
->pc_release
)
829 procp
->pc_release(rqstp
, NULL
, rqstp
->rq_resp
);
832 if (*statp
== rpc_success
&& (xdr
= procp
->pc_encode
)
833 && !xdr(rqstp
, resv
->iov_base
+resv
->iov_len
, rqstp
->rq_resp
)) {
834 dprintk("svc: failed to encode reply\n");
835 /* serv->sv_stats->rpcsystemerr++; */
836 *statp
= rpc_system_err
;
839 dprintk("svc: calling dispatcher\n");
840 if (!versp
->vs_dispatch(rqstp
, statp
)) {
841 /* Release reply info */
842 if (procp
->pc_release
)
843 procp
->pc_release(rqstp
, NULL
, rqstp
->rq_resp
);
848 /* Check RPC status result */
849 if (*statp
!= rpc_success
)
850 resv
->iov_len
= ((void*)statp
) - resv
->iov_base
+ 4;
852 /* Release reply info */
853 if (procp
->pc_release
)
854 procp
->pc_release(rqstp
, NULL
, rqstp
->rq_resp
);
856 if (procp
->pc_encode
== NULL
)
860 if (svc_authorise(rqstp
))
862 return svc_send(rqstp
);
865 svc_authorise(rqstp
); /* doesn't hurt to call this twice */
866 dprintk("svc: svc_process dropit\n");
872 printk("svc: short len %Zd, dropping request\n", argv
->iov_len
);
874 goto dropit
; /* drop request */
878 printk("svc: bad direction %d, dropping request\n", dir
);
880 serv
->sv_stats
->rpcbadfmt
++;
881 goto dropit
; /* drop request */
884 serv
->sv_stats
->rpcbadfmt
++;
885 svc_putnl(resv
, 1); /* REJECT */
886 svc_putnl(resv
, 0); /* RPC_MISMATCH */
887 svc_putnl(resv
, 2); /* Only RPCv2 supported */
892 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat
));
893 serv
->sv_stats
->rpcbadauth
++;
894 /* Restore write pointer to location of accept status: */
895 xdr_ressize_check(rqstp
, reply_statp
);
896 svc_putnl(resv
, 1); /* REJECT */
897 svc_putnl(resv
, 1); /* AUTH_ERROR */
898 svc_putnl(resv
, ntohl(auth_stat
)); /* status */
902 dprintk("svc: unknown program %d\n", prog
);
903 serv
->sv_stats
->rpcbadfmt
++;
904 svc_putnl(resv
, RPC_PROG_UNAVAIL
);
909 printk("svc: unknown version (%d for prog %d, %s)\n",
910 vers
, prog
, progp
->pg_name
);
912 serv
->sv_stats
->rpcbadfmt
++;
913 svc_putnl(resv
, RPC_PROG_MISMATCH
);
914 svc_putnl(resv
, progp
->pg_lovers
);
915 svc_putnl(resv
, progp
->pg_hivers
);
920 printk("svc: unknown procedure (%d)\n", proc
);
922 serv
->sv_stats
->rpcbadfmt
++;
923 svc_putnl(resv
, RPC_PROC_UNAVAIL
);
928 printk("svc: failed to decode args\n");
930 rpc_stat
= rpc_garbage_args
;
932 serv
->sv_stats
->rpcbadfmt
++;
933 svc_putnl(resv
, ntohl(rpc_stat
));
938 * Return (transport-specific) limit on the rpc payload.
940 u32
svc_max_payload(const struct svc_rqst
*rqstp
)
942 int max
= RPCSVC_MAXPAYLOAD_TCP
;
944 if (rqstp
->rq_sock
->sk_sock
->type
== SOCK_DGRAM
)
945 max
= RPCSVC_MAXPAYLOAD_UDP
;
946 if (rqstp
->rq_server
->sv_max_payload
< max
)
947 max
= rqstp
->rq_server
->sv_max_payload
;
950 EXPORT_SYMBOL_GPL(svc_max_payload
);