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>
21 #include <linux/kthread.h>
23 #include <linux/sunrpc/types.h>
24 #include <linux/sunrpc/xdr.h>
25 #include <linux/sunrpc/stats.h>
26 #include <linux/sunrpc/svcsock.h>
27 #include <linux/sunrpc/clnt.h>
29 #define RPCDBG_FACILITY RPCDBG_SVCDSP
31 #define svc_serv_is_pooled(serv) ((serv)->sv_function)
34 * Mode for mapping cpus to pools.
37 SVC_POOL_AUTO = -1, /* choose one of the others */
38 SVC_POOL_GLOBAL, /* no mapping, just a single global pool
39 * (legacy & UP mode) */
40 SVC_POOL_PERCPU, /* one pool per cpu */
41 SVC_POOL_PERNODE /* one pool per numa node */
43 #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
46 * Structure for mapping cpus to pools and vice versa.
47 * Setup once during sunrpc initialisation.
49 static struct svc_pool_map {
50 int count; /* How many svc_servs use us */
51 int mode; /* Note: int not enum to avoid
52 * warnings about "enumeration value
53 * not handled in switch" */
55 unsigned int *pool_to; /* maps pool id to cpu or node */
56 unsigned int *to_pool; /* maps cpu or node to pool id */
59 .mode = SVC_POOL_DEFAULT
61 static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
64 param_set_pool_mode(const char *val, struct kernel_param *kp)
66 int *ip = (int *)kp->arg;
67 struct svc_pool_map *m = &svc_pool_map;
70 mutex_lock(&svc_pool_map_mutex);
77 if (!strncmp(val, "auto", 4))
79 else if (!strncmp(val, "global", 6))
80 *ip = SVC_POOL_GLOBAL;
81 else if (!strncmp(val, "percpu", 6))
82 *ip = SVC_POOL_PERCPU;
83 else if (!strncmp(val, "pernode", 7))
84 *ip = SVC_POOL_PERNODE;
89 mutex_unlock(&svc_pool_map_mutex);
94 param_get_pool_mode(char *buf, struct kernel_param *kp)
96 int *ip = (int *)kp->arg;
101 return strlcpy(buf, "auto", 20);
102 case SVC_POOL_GLOBAL:
103 return strlcpy(buf, "global", 20);
104 case SVC_POOL_PERCPU:
105 return strlcpy(buf, "percpu", 20);
106 case SVC_POOL_PERNODE:
107 return strlcpy(buf, "pernode", 20);
109 return sprintf(buf, "%d", *ip);
113 module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
114 &svc_pool_map.mode, 0644);
117 * Detect best pool mapping mode heuristically,
118 * according to the machine's topology.
121 svc_pool_map_choose_mode(void)
125 if (num_online_nodes() > 1) {
127 * Actually have multiple NUMA nodes,
128 * so split pools on NUMA node boundaries
130 return SVC_POOL_PERNODE;
133 node = any_online_node(node_online_map);
134 if (nr_cpus_node(node) > 2) {
136 * Non-trivial SMP, or CONFIG_NUMA on
137 * non-NUMA hardware, e.g. with a generic
138 * x86_64 kernel on Xeons. In this case we
139 * want to divide the pools on cpu boundaries.
141 return SVC_POOL_PERCPU;
144 /* default: one global pool */
145 return SVC_POOL_GLOBAL;
149 * Allocate the to_pool[] and pool_to[] arrays.
150 * Returns 0 on success or an errno.
153 svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
155 m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
158 m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
171 * Initialise the pool map for SVC_POOL_PERCPU mode.
172 * Returns number of pools or <0 on error.
175 svc_pool_map_init_percpu(struct svc_pool_map *m)
177 unsigned int maxpools = nr_cpu_ids;
178 unsigned int pidx = 0;
182 err = svc_pool_map_alloc_arrays(m, maxpools);
186 for_each_online_cpu(cpu) {
187 BUG_ON(pidx > maxpools);
188 m->to_pool[cpu] = pidx;
189 m->pool_to[pidx] = cpu;
192 /* cpus brought online later all get mapped to pool0, sorry */
199 * Initialise the pool map for SVC_POOL_PERNODE mode.
200 * Returns number of pools or <0 on error.
203 svc_pool_map_init_pernode(struct svc_pool_map *m)
205 unsigned int maxpools = nr_node_ids;
206 unsigned int pidx = 0;
210 err = svc_pool_map_alloc_arrays(m, maxpools);
214 for_each_node_with_cpus(node) {
215 /* some architectures (e.g. SN2) have cpuless nodes */
216 BUG_ON(pidx > maxpools);
217 m->to_pool[node] = pidx;
218 m->pool_to[pidx] = node;
221 /* nodes brought online later all get mapped to pool0, sorry */
228 * Add a reference to the global map of cpus to pools (and
229 * vice versa). Initialise the map if we're the first user.
230 * Returns the number of pools.
233 svc_pool_map_get(void)
235 struct svc_pool_map *m = &svc_pool_map;
238 mutex_lock(&svc_pool_map_mutex);
241 mutex_unlock(&svc_pool_map_mutex);
245 if (m->mode == SVC_POOL_AUTO)
246 m->mode = svc_pool_map_choose_mode();
249 case SVC_POOL_PERCPU:
250 npools = svc_pool_map_init_percpu(m);
252 case SVC_POOL_PERNODE:
253 npools = svc_pool_map_init_pernode(m);
258 /* default, or memory allocation failure */
260 m->mode = SVC_POOL_GLOBAL;
264 mutex_unlock(&svc_pool_map_mutex);
270 * Drop a reference to the global map of cpus to pools.
271 * When the last reference is dropped, the map data is
272 * freed; this allows the sysadmin to change the pool
273 * mode using the pool_mode module option without
274 * rebooting or re-loading sunrpc.ko.
277 svc_pool_map_put(void)
279 struct svc_pool_map *m = &svc_pool_map;
281 mutex_lock(&svc_pool_map_mutex);
284 m->mode = SVC_POOL_DEFAULT;
290 mutex_unlock(&svc_pool_map_mutex);
295 * Set the given thread's cpus_allowed mask so that it
296 * will only run on cpus in the given pool.
299 svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
301 struct svc_pool_map *m = &svc_pool_map;
302 unsigned int node = m->pool_to[pidx];
305 * The caller checks for sv_nrpools > 1, which
306 * implies that we've been initialized.
308 BUG_ON(m->count == 0);
311 case SVC_POOL_PERCPU:
313 set_cpus_allowed_ptr(task, &cpumask_of_cpu(node));
316 case SVC_POOL_PERNODE:
318 node_to_cpumask_ptr(nodecpumask, node);
319 set_cpus_allowed_ptr(task, nodecpumask);
326 * Use the mapping mode to choose a pool for a given CPU.
327 * Used when enqueueing an incoming RPC. Always returns
328 * a non-NULL pool pointer.
331 svc_pool_for_cpu(struct svc_serv *serv, int cpu)
333 struct svc_pool_map *m = &svc_pool_map;
334 unsigned int pidx = 0;
337 * An uninitialised map happens in a pure client when
338 * lockd is brought up, so silently treat it the
339 * same as SVC_POOL_GLOBAL.
341 if (svc_serv_is_pooled(serv)) {
343 case SVC_POOL_PERCPU:
344 pidx = m->to_pool[cpu];
346 case SVC_POOL_PERNODE:
347 pidx = m->to_pool[cpu_to_node(cpu)];
351 return &serv->sv_pools[pidx % serv->sv_nrpools];
356 * Create an RPC service
358 static struct svc_serv *
359 __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
360 sa_family_t family, void (*shutdown)(struct svc_serv *serv))
362 struct svc_serv *serv;
364 unsigned int xdrsize;
367 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
369 serv->sv_family = family;
370 serv->sv_name = prog->pg_name;
371 serv->sv_program = prog;
372 serv->sv_nrthreads = 1;
373 serv->sv_stats = prog->pg_stats;
374 if (bufsize > RPCSVC_MAXPAYLOAD)
375 bufsize = RPCSVC_MAXPAYLOAD;
376 serv->sv_max_payload = bufsize? bufsize : 4096;
377 serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
378 serv->sv_shutdown = shutdown;
381 prog->pg_lovers = prog->pg_nvers-1;
382 for (vers=0; vers<prog->pg_nvers ; vers++)
383 if (prog->pg_vers[vers]) {
384 prog->pg_hivers = vers;
385 if (prog->pg_lovers > vers)
386 prog->pg_lovers = vers;
387 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
388 xdrsize = prog->pg_vers[vers]->vs_xdrsize;
390 prog = prog->pg_next;
392 serv->sv_xdrsize = xdrsize;
393 INIT_LIST_HEAD(&serv->sv_tempsocks);
394 INIT_LIST_HEAD(&serv->sv_permsocks);
395 init_timer(&serv->sv_temptimer);
396 spin_lock_init(&serv->sv_lock);
398 serv->sv_nrpools = npools;
400 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
402 if (!serv->sv_pools) {
407 for (i = 0; i < serv->sv_nrpools; i++) {
408 struct svc_pool *pool = &serv->sv_pools[i];
410 dprintk("svc: initialising pool %u for %s\n",
414 INIT_LIST_HEAD(&pool->sp_threads);
415 INIT_LIST_HEAD(&pool->sp_sockets);
416 INIT_LIST_HEAD(&pool->sp_all_threads);
417 spin_lock_init(&pool->sp_lock);
421 /* Remove any stale portmap registrations */
422 svc_register(serv, 0, 0);
428 svc_create(struct svc_program *prog, unsigned int bufsize,
429 sa_family_t family, void (*shutdown)(struct svc_serv *serv))
431 return __svc_create(prog, bufsize, /*npools*/1, family, shutdown);
433 EXPORT_SYMBOL(svc_create);
436 svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
437 sa_family_t family, void (*shutdown)(struct svc_serv *serv),
438 svc_thread_fn func, struct module *mod)
440 struct svc_serv *serv;
441 unsigned int npools = svc_pool_map_get();
443 serv = __svc_create(prog, bufsize, npools, family, shutdown);
446 serv->sv_function = func;
447 serv->sv_module = mod;
452 EXPORT_SYMBOL(svc_create_pooled);
455 * Destroy an RPC service. Should be called with appropriate locking to
456 * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
459 svc_destroy(struct svc_serv *serv)
461 dprintk("svc: svc_destroy(%s, %d)\n",
462 serv->sv_program->pg_name,
465 if (serv->sv_nrthreads) {
466 if (--(serv->sv_nrthreads) != 0) {
467 svc_sock_update_bufs(serv);
471 printk("svc_destroy: no threads for serv=%p!\n", serv);
473 del_timer_sync(&serv->sv_temptimer);
475 svc_close_all(&serv->sv_tempsocks);
477 if (serv->sv_shutdown)
478 serv->sv_shutdown(serv);
480 svc_close_all(&serv->sv_permsocks);
482 BUG_ON(!list_empty(&serv->sv_permsocks));
483 BUG_ON(!list_empty(&serv->sv_tempsocks));
485 cache_clean_deferred(serv);
487 if (svc_serv_is_pooled(serv))
490 /* Unregister service with the portmapper */
491 svc_register(serv, 0, 0);
492 kfree(serv->sv_pools);
495 EXPORT_SYMBOL(svc_destroy);
498 * Allocate an RPC server's buffer space.
499 * We allocate pages and place them in rq_argpages.
502 svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
504 unsigned int pages, arghi;
506 pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
507 * We assume one is at most one page
510 BUG_ON(pages > RPCSVC_MAXPAGES);
512 struct page *p = alloc_page(GFP_KERNEL);
515 rqstp->rq_pages[arghi++] = p;
522 * Release an RPC server buffer
525 svc_release_buffer(struct svc_rqst *rqstp)
529 for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
530 if (rqstp->rq_pages[i])
531 put_page(rqstp->rq_pages[i]);
535 svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
537 struct svc_rqst *rqstp;
539 rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
543 init_waitqueue_head(&rqstp->rq_wait);
545 serv->sv_nrthreads++;
546 spin_lock_bh(&pool->sp_lock);
547 pool->sp_nrthreads++;
548 list_add(&rqstp->rq_all, &pool->sp_all_threads);
549 spin_unlock_bh(&pool->sp_lock);
550 rqstp->rq_server = serv;
551 rqstp->rq_pool = pool;
553 rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
557 rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
561 if (!svc_init_buffer(rqstp, serv->sv_max_mesg))
566 svc_exit_thread(rqstp);
568 return ERR_PTR(-ENOMEM);
570 EXPORT_SYMBOL(svc_prepare_thread);
573 * Choose a pool in which to create a new thread, for svc_set_num_threads
575 static inline struct svc_pool *
576 choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
581 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
585 * Choose a thread to kill, for svc_set_num_threads
587 static inline struct task_struct *
588 choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
591 struct task_struct *task = NULL;
594 spin_lock_bh(&pool->sp_lock);
596 /* choose a pool in round-robin fashion */
597 for (i = 0; i < serv->sv_nrpools; i++) {
598 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
599 spin_lock_bh(&pool->sp_lock);
600 if (!list_empty(&pool->sp_all_threads))
602 spin_unlock_bh(&pool->sp_lock);
608 if (!list_empty(&pool->sp_all_threads)) {
609 struct svc_rqst *rqstp;
612 * Remove from the pool->sp_all_threads list
613 * so we don't try to kill it again.
615 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
616 list_del_init(&rqstp->rq_all);
617 task = rqstp->rq_task;
619 spin_unlock_bh(&pool->sp_lock);
625 * Create or destroy enough new threads to make the number
626 * of threads the given number. If `pool' is non-NULL, applies
627 * only to threads in that pool, otherwise round-robins between
628 * all pools. Must be called with a svc_get() reference and
629 * the BKL or another lock to protect access to svc_serv fields.
631 * Destroying threads relies on the service threads filling in
632 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
633 * has been created using svc_create_pooled().
635 * Based on code that used to be in nfsd_svc() but tweaked
639 svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
641 struct svc_rqst *rqstp;
642 struct task_struct *task;
643 struct svc_pool *chosen_pool;
645 unsigned int state = serv->sv_nrthreads-1;
648 /* The -1 assumes caller has done a svc_get() */
649 nrservs -= (serv->sv_nrthreads-1);
651 spin_lock_bh(&pool->sp_lock);
652 nrservs -= pool->sp_nrthreads;
653 spin_unlock_bh(&pool->sp_lock);
656 /* create new threads */
657 while (nrservs > 0) {
659 chosen_pool = choose_pool(serv, pool, &state);
661 rqstp = svc_prepare_thread(serv, chosen_pool);
663 error = PTR_ERR(rqstp);
667 __module_get(serv->sv_module);
668 task = kthread_create(serv->sv_function, rqstp, serv->sv_name);
670 error = PTR_ERR(task);
671 module_put(serv->sv_module);
672 svc_exit_thread(rqstp);
676 rqstp->rq_task = task;
677 if (serv->sv_nrpools > 1)
678 svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
680 svc_sock_update_bufs(serv);
681 wake_up_process(task);
683 /* destroy old threads */
684 while (nrservs < 0 &&
685 (task = choose_victim(serv, pool, &state)) != NULL) {
686 send_sig(SIGINT, task, 1);
692 EXPORT_SYMBOL(svc_set_num_threads);
695 * Called from a server thread as it's exiting. Caller must hold the BKL or
696 * the "service mutex", whichever is appropriate for the service.
699 svc_exit_thread(struct svc_rqst *rqstp)
701 struct svc_serv *serv = rqstp->rq_server;
702 struct svc_pool *pool = rqstp->rq_pool;
704 svc_release_buffer(rqstp);
705 kfree(rqstp->rq_resp);
706 kfree(rqstp->rq_argp);
707 kfree(rqstp->rq_auth_data);
709 spin_lock_bh(&pool->sp_lock);
710 pool->sp_nrthreads--;
711 list_del(&rqstp->rq_all);
712 spin_unlock_bh(&pool->sp_lock);
716 /* Release the server */
720 EXPORT_SYMBOL(svc_exit_thread);
723 * Register an RPC service with the local portmapper.
724 * To unregister a service, call this routine with
725 * proto and port == 0.
728 svc_register(struct svc_serv *serv, int proto, unsigned short port)
730 struct svc_program *progp;
736 clear_thread_flag(TIF_SIGPENDING);
738 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
739 for (i = 0; i < progp->pg_nvers; i++) {
740 if (progp->pg_vers[i] == NULL)
743 dprintk("svc: svc_register(%s, %s, %d, %d)%s\n",
745 proto == IPPROTO_UDP? "udp" : "tcp",
748 progp->pg_vers[i]->vs_hidden?
749 " (but not telling portmap)" : "");
751 if (progp->pg_vers[i]->vs_hidden)
754 error = rpcb_register(progp->pg_prog, i, proto, port);
761 spin_lock_irqsave(¤t->sighand->siglock, flags);
763 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
770 * Printk the given error with the address of the client that caused it.
773 __attribute__ ((format (printf, 2, 3)))
774 svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
778 char buf[RPC_MAX_ADDRBUFLEN];
780 if (!net_ratelimit())
783 printk(KERN_WARNING "svc: %s: ",
784 svc_print_addr(rqstp, buf, sizeof(buf)));
787 r = vprintk(fmt, args);
794 * Process the RPC request.
797 svc_process(struct svc_rqst *rqstp)
799 struct svc_program *progp;
800 struct svc_version *versp = NULL; /* compiler food */
801 struct svc_procedure *procp = NULL;
802 struct kvec * argv = &rqstp->rq_arg.head[0];
803 struct kvec * resv = &rqstp->rq_res.head[0];
804 struct svc_serv *serv = rqstp->rq_server;
807 u32 dir, prog, vers, proc;
808 __be32 auth_stat, rpc_stat;
812 rpc_stat = rpc_success;
814 if (argv->iov_len < 6*4)
817 /* setup response xdr_buf.
818 * Initially it has just one page
820 rqstp->rq_resused = 1;
821 resv->iov_base = page_address(rqstp->rq_respages[0]);
823 rqstp->rq_res.pages = rqstp->rq_respages + 1;
824 rqstp->rq_res.len = 0;
825 rqstp->rq_res.page_base = 0;
826 rqstp->rq_res.page_len = 0;
827 rqstp->rq_res.buflen = PAGE_SIZE;
828 rqstp->rq_res.tail[0].iov_base = NULL;
829 rqstp->rq_res.tail[0].iov_len = 0;
830 /* Will be turned off only in gss privacy case: */
831 rqstp->rq_splice_ok = 1;
833 /* Setup reply header */
834 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
836 rqstp->rq_xid = svc_getu32(argv);
837 svc_putu32(resv, rqstp->rq_xid);
839 dir = svc_getnl(argv);
840 vers = svc_getnl(argv);
842 /* First words of reply: */
843 svc_putnl(resv, 1); /* REPLY */
845 if (dir != 0) /* direction != CALL */
847 if (vers != 2) /* RPC version number */
850 /* Save position in case we later decide to reject: */
851 reply_statp = resv->iov_base + resv->iov_len;
853 svc_putnl(resv, 0); /* ACCEPT */
855 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
856 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
857 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
859 progp = serv->sv_program;
861 for (progp = serv->sv_program; progp; progp = progp->pg_next)
862 if (prog == progp->pg_prog)
866 * Decode auth data, and add verifier to reply buffer.
867 * We do this before anything else in order to get a decent
870 auth_res = svc_authenticate(rqstp, &auth_stat);
871 /* Also give the program a chance to reject this call: */
872 if (auth_res == SVC_OK && progp) {
873 auth_stat = rpc_autherr_badcred;
874 auth_res = progp->pg_authenticate(rqstp);
882 rpc_stat = rpc_system_err;
895 if (vers >= progp->pg_nvers ||
896 !(versp = progp->pg_vers[vers]))
899 procp = versp->vs_proc + proc;
900 if (proc >= versp->vs_nproc || !procp->pc_func)
902 rqstp->rq_server = serv;
903 rqstp->rq_procinfo = procp;
905 /* Syntactic check complete */
906 serv->sv_stats->rpccnt++;
908 /* Build the reply header. */
909 statp = resv->iov_base +resv->iov_len;
910 svc_putnl(resv, RPC_SUCCESS);
912 /* Bump per-procedure stats counter */
915 /* Initialize storage for argp and resp */
916 memset(rqstp->rq_argp, 0, procp->pc_argsize);
917 memset(rqstp->rq_resp, 0, procp->pc_ressize);
919 /* un-reserve some of the out-queue now that we have a
920 * better idea of reply size
922 if (procp->pc_xdrressize)
923 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
925 /* Call the function that processes the request. */
926 if (!versp->vs_dispatch) {
927 /* Decode arguments */
928 xdr = procp->pc_decode;
929 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
932 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
935 if (*statp == rpc_drop_reply) {
936 if (procp->pc_release)
937 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
940 if (*statp == rpc_success && (xdr = procp->pc_encode)
941 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
942 dprintk("svc: failed to encode reply\n");
943 /* serv->sv_stats->rpcsystemerr++; */
944 *statp = rpc_system_err;
947 dprintk("svc: calling dispatcher\n");
948 if (!versp->vs_dispatch(rqstp, statp)) {
949 /* Release reply info */
950 if (procp->pc_release)
951 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
956 /* Check RPC status result */
957 if (*statp != rpc_success)
958 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
960 /* Release reply info */
961 if (procp->pc_release)
962 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
964 if (procp->pc_encode == NULL)
968 if (svc_authorise(rqstp))
970 return svc_send(rqstp);
973 svc_authorise(rqstp); /* doesn't hurt to call this twice */
974 dprintk("svc: svc_process dropit\n");
979 svc_printk(rqstp, "short len %Zd, dropping request\n",
982 goto dropit; /* drop request */
985 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
987 serv->sv_stats->rpcbadfmt++;
988 goto dropit; /* drop request */
991 serv->sv_stats->rpcbadfmt++;
992 svc_putnl(resv, 1); /* REJECT */
993 svc_putnl(resv, 0); /* RPC_MISMATCH */
994 svc_putnl(resv, 2); /* Only RPCv2 supported */
999 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1000 serv->sv_stats->rpcbadauth++;
1001 /* Restore write pointer to location of accept status: */
1002 xdr_ressize_check(rqstp, reply_statp);
1003 svc_putnl(resv, 1); /* REJECT */
1004 svc_putnl(resv, 1); /* AUTH_ERROR */
1005 svc_putnl(resv, ntohl(auth_stat)); /* status */
1009 dprintk("svc: unknown program %d\n", prog);
1010 serv->sv_stats->rpcbadfmt++;
1011 svc_putnl(resv, RPC_PROG_UNAVAIL);
1015 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
1016 vers, prog, progp->pg_name);
1018 serv->sv_stats->rpcbadfmt++;
1019 svc_putnl(resv, RPC_PROG_MISMATCH);
1020 svc_putnl(resv, progp->pg_lovers);
1021 svc_putnl(resv, progp->pg_hivers);
1025 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
1027 serv->sv_stats->rpcbadfmt++;
1028 svc_putnl(resv, RPC_PROC_UNAVAIL);
1032 svc_printk(rqstp, "failed to decode args\n");
1034 rpc_stat = rpc_garbage_args;
1036 serv->sv_stats->rpcbadfmt++;
1037 svc_putnl(resv, ntohl(rpc_stat));
1040 EXPORT_SYMBOL(svc_process);
1043 * Return (transport-specific) limit on the rpc payload.
1045 u32 svc_max_payload(const struct svc_rqst *rqstp)
1047 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
1049 if (rqstp->rq_server->sv_max_payload < max)
1050 max = rqstp->rq_server->sv_max_payload;
1053 EXPORT_SYMBOL_GPL(svc_max_payload);