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/sched.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 current thread's cpus_allowed mask so that it
296 * will only run on cpus in the given pool.
298 * Returns 1 and fills in oldmask iff a cpumask was applied.
301 svc_pool_map_set_cpumask(unsigned int pidx, cpumask_t *oldmask)
303 struct svc_pool_map *m = &svc_pool_map;
306 * The caller checks for sv_nrpools > 1, which
307 * implies that we've been initialized.
309 BUG_ON(m->count == 0);
315 case SVC_POOL_PERCPU:
317 unsigned int cpu = m->pool_to[pidx];
319 *oldmask = current->cpus_allowed;
320 set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
323 case SVC_POOL_PERNODE:
325 unsigned int node = m->pool_to[pidx];
326 node_to_cpumask_ptr(nodecpumask, node);
328 *oldmask = current->cpus_allowed;
329 set_cpus_allowed_ptr(current, nodecpumask);
336 * Use the mapping mode to choose a pool for a given CPU.
337 * Used when enqueueing an incoming RPC. Always returns
338 * a non-NULL pool pointer.
341 svc_pool_for_cpu(struct svc_serv *serv, int cpu)
343 struct svc_pool_map *m = &svc_pool_map;
344 unsigned int pidx = 0;
347 * An uninitialised map happens in a pure client when
348 * lockd is brought up, so silently treat it the
349 * same as SVC_POOL_GLOBAL.
351 if (svc_serv_is_pooled(serv)) {
353 case SVC_POOL_PERCPU:
354 pidx = m->to_pool[cpu];
356 case SVC_POOL_PERNODE:
357 pidx = m->to_pool[cpu_to_node(cpu)];
361 return &serv->sv_pools[pidx % serv->sv_nrpools];
366 * Create an RPC service
368 static struct svc_serv *
369 __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
370 void (*shutdown)(struct svc_serv *serv))
372 struct svc_serv *serv;
374 unsigned int xdrsize;
377 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
379 serv->sv_name = prog->pg_name;
380 serv->sv_program = prog;
381 serv->sv_nrthreads = 1;
382 serv->sv_stats = prog->pg_stats;
383 if (bufsize > RPCSVC_MAXPAYLOAD)
384 bufsize = RPCSVC_MAXPAYLOAD;
385 serv->sv_max_payload = bufsize? bufsize : 4096;
386 serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
387 serv->sv_shutdown = shutdown;
390 prog->pg_lovers = prog->pg_nvers-1;
391 for (vers=0; vers<prog->pg_nvers ; vers++)
392 if (prog->pg_vers[vers]) {
393 prog->pg_hivers = vers;
394 if (prog->pg_lovers > vers)
395 prog->pg_lovers = vers;
396 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
397 xdrsize = prog->pg_vers[vers]->vs_xdrsize;
399 prog = prog->pg_next;
401 serv->sv_xdrsize = xdrsize;
402 INIT_LIST_HEAD(&serv->sv_tempsocks);
403 INIT_LIST_HEAD(&serv->sv_permsocks);
404 init_timer(&serv->sv_temptimer);
405 spin_lock_init(&serv->sv_lock);
407 serv->sv_nrpools = npools;
409 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
411 if (!serv->sv_pools) {
416 for (i = 0; i < serv->sv_nrpools; i++) {
417 struct svc_pool *pool = &serv->sv_pools[i];
419 dprintk("svc: initialising pool %u for %s\n",
423 INIT_LIST_HEAD(&pool->sp_threads);
424 INIT_LIST_HEAD(&pool->sp_sockets);
425 INIT_LIST_HEAD(&pool->sp_all_threads);
426 spin_lock_init(&pool->sp_lock);
430 /* Remove any stale portmap registrations */
431 svc_register(serv, 0, 0);
437 svc_create(struct svc_program *prog, unsigned int bufsize,
438 void (*shutdown)(struct svc_serv *serv))
440 return __svc_create(prog, bufsize, /*npools*/1, shutdown);
442 EXPORT_SYMBOL(svc_create);
445 svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
446 void (*shutdown)(struct svc_serv *serv),
447 svc_thread_fn func, int sig, struct module *mod)
449 struct svc_serv *serv;
450 unsigned int npools = svc_pool_map_get();
452 serv = __svc_create(prog, bufsize, npools, shutdown);
455 serv->sv_function = func;
456 serv->sv_kill_signal = sig;
457 serv->sv_module = mod;
462 EXPORT_SYMBOL(svc_create_pooled);
465 * Destroy an RPC service. Should be called with the BKL held
468 svc_destroy(struct svc_serv *serv)
470 dprintk("svc: svc_destroy(%s, %d)\n",
471 serv->sv_program->pg_name,
474 if (serv->sv_nrthreads) {
475 if (--(serv->sv_nrthreads) != 0) {
476 svc_sock_update_bufs(serv);
480 printk("svc_destroy: no threads for serv=%p!\n", serv);
482 del_timer_sync(&serv->sv_temptimer);
484 svc_close_all(&serv->sv_tempsocks);
486 if (serv->sv_shutdown)
487 serv->sv_shutdown(serv);
489 svc_close_all(&serv->sv_permsocks);
491 BUG_ON(!list_empty(&serv->sv_permsocks));
492 BUG_ON(!list_empty(&serv->sv_tempsocks));
494 cache_clean_deferred(serv);
496 if (svc_serv_is_pooled(serv))
499 /* Unregister service with the portmapper */
500 svc_register(serv, 0, 0);
501 kfree(serv->sv_pools);
504 EXPORT_SYMBOL(svc_destroy);
507 * Allocate an RPC server's buffer space.
508 * We allocate pages and place them in rq_argpages.
511 svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
516 pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
517 * We assume one is at most one page
520 BUG_ON(pages > RPCSVC_MAXPAGES);
522 struct page *p = alloc_page(GFP_KERNEL);
525 rqstp->rq_pages[arghi++] = p;
532 * Release an RPC server buffer
535 svc_release_buffer(struct svc_rqst *rqstp)
539 for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
540 if (rqstp->rq_pages[i])
541 put_page(rqstp->rq_pages[i]);
545 svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
547 struct svc_rqst *rqstp;
549 rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
553 init_waitqueue_head(&rqstp->rq_wait);
555 serv->sv_nrthreads++;
556 spin_lock_bh(&pool->sp_lock);
557 pool->sp_nrthreads++;
558 list_add(&rqstp->rq_all, &pool->sp_all_threads);
559 spin_unlock_bh(&pool->sp_lock);
560 rqstp->rq_server = serv;
561 rqstp->rq_pool = pool;
563 rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
567 rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
571 if (!svc_init_buffer(rqstp, serv->sv_max_mesg))
576 svc_exit_thread(rqstp);
578 return ERR_PTR(-ENOMEM);
580 EXPORT_SYMBOL(svc_prepare_thread);
583 * Create a thread in the given pool. Caller must hold BKL.
584 * On a NUMA or SMP machine, with a multi-pool serv, the thread
585 * will be restricted to run on the cpus belonging to the pool.
588 __svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
589 struct svc_pool *pool)
591 struct svc_rqst *rqstp;
593 int have_oldmask = 0;
594 cpumask_t uninitialized_var(oldmask);
596 rqstp = svc_prepare_thread(serv, pool);
598 error = PTR_ERR(rqstp);
602 if (serv->sv_nrpools > 1)
603 have_oldmask = svc_pool_map_set_cpumask(pool->sp_id, &oldmask);
605 error = kernel_thread((int (*)(void *)) func, rqstp, 0);
608 set_cpus_allowed(current, oldmask);
612 svc_sock_update_bufs(serv);
618 svc_exit_thread(rqstp);
623 * Choose a pool in which to create a new thread, for svc_set_num_threads
625 static inline struct svc_pool *
626 choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
631 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
635 * Choose a thread to kill, for svc_set_num_threads
637 static inline struct task_struct *
638 choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
641 struct task_struct *task = NULL;
644 spin_lock_bh(&pool->sp_lock);
646 /* choose a pool in round-robin fashion */
647 for (i = 0; i < serv->sv_nrpools; i++) {
648 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
649 spin_lock_bh(&pool->sp_lock);
650 if (!list_empty(&pool->sp_all_threads))
652 spin_unlock_bh(&pool->sp_lock);
658 if (!list_empty(&pool->sp_all_threads)) {
659 struct svc_rqst *rqstp;
662 * Remove from the pool->sp_all_threads list
663 * so we don't try to kill it again.
665 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
666 list_del_init(&rqstp->rq_all);
667 task = rqstp->rq_task;
669 spin_unlock_bh(&pool->sp_lock);
675 * Create or destroy enough new threads to make the number
676 * of threads the given number. If `pool' is non-NULL, applies
677 * only to threads in that pool, otherwise round-robins between
678 * all pools. Must be called with a svc_get() reference and
681 * Destroying threads relies on the service threads filling in
682 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
683 * has been created using svc_create_pooled().
685 * Based on code that used to be in nfsd_svc() but tweaked
689 svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
691 struct task_struct *victim;
693 unsigned int state = serv->sv_nrthreads-1;
696 /* The -1 assumes caller has done a svc_get() */
697 nrservs -= (serv->sv_nrthreads-1);
699 spin_lock_bh(&pool->sp_lock);
700 nrservs -= pool->sp_nrthreads;
701 spin_unlock_bh(&pool->sp_lock);
704 /* create new threads */
705 while (nrservs > 0) {
707 __module_get(serv->sv_module);
708 error = __svc_create_thread(serv->sv_function, serv,
709 choose_pool(serv, pool, &state));
711 module_put(serv->sv_module);
715 /* destroy old threads */
716 while (nrservs < 0 &&
717 (victim = choose_victim(serv, pool, &state)) != NULL) {
718 send_sig(serv->sv_kill_signal, victim, 1);
724 EXPORT_SYMBOL(svc_set_num_threads);
727 * Called from a server thread as it's exiting. Caller must hold BKL.
730 svc_exit_thread(struct svc_rqst *rqstp)
732 struct svc_serv *serv = rqstp->rq_server;
733 struct svc_pool *pool = rqstp->rq_pool;
735 svc_release_buffer(rqstp);
736 kfree(rqstp->rq_resp);
737 kfree(rqstp->rq_argp);
738 kfree(rqstp->rq_auth_data);
740 spin_lock_bh(&pool->sp_lock);
741 pool->sp_nrthreads--;
742 list_del(&rqstp->rq_all);
743 spin_unlock_bh(&pool->sp_lock);
747 /* Release the server */
751 EXPORT_SYMBOL(svc_exit_thread);
754 * Register an RPC service with the local portmapper.
755 * To unregister a service, call this routine with
756 * proto and port == 0.
759 svc_register(struct svc_serv *serv, int proto, unsigned short port)
761 struct svc_program *progp;
764 int error = 0, dummy;
767 clear_thread_flag(TIF_SIGPENDING);
769 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
770 for (i = 0; i < progp->pg_nvers; i++) {
771 if (progp->pg_vers[i] == NULL)
774 dprintk("svc: svc_register(%s, %s, %d, %d)%s\n",
776 proto == IPPROTO_UDP? "udp" : "tcp",
779 progp->pg_vers[i]->vs_hidden?
780 " (but not telling portmap)" : "");
782 if (progp->pg_vers[i]->vs_hidden)
785 error = rpcb_register(progp->pg_prog, i, proto, port, &dummy);
788 if (port && !dummy) {
796 spin_lock_irqsave(¤t->sighand->siglock, flags);
798 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
805 * Printk the given error with the address of the client that caused it.
808 __attribute__ ((format (printf, 2, 3)))
809 svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
813 char buf[RPC_MAX_ADDRBUFLEN];
815 if (!net_ratelimit())
818 printk(KERN_WARNING "svc: %s: ",
819 svc_print_addr(rqstp, buf, sizeof(buf)));
822 r = vprintk(fmt, args);
829 * Process the RPC request.
832 svc_process(struct svc_rqst *rqstp)
834 struct svc_program *progp;
835 struct svc_version *versp = NULL; /* compiler food */
836 struct svc_procedure *procp = NULL;
837 struct kvec * argv = &rqstp->rq_arg.head[0];
838 struct kvec * resv = &rqstp->rq_res.head[0];
839 struct svc_serv *serv = rqstp->rq_server;
842 u32 dir, prog, vers, proc;
843 __be32 auth_stat, rpc_stat;
847 rpc_stat = rpc_success;
849 if (argv->iov_len < 6*4)
852 /* setup response xdr_buf.
853 * Initially it has just one page
855 rqstp->rq_resused = 1;
856 resv->iov_base = page_address(rqstp->rq_respages[0]);
858 rqstp->rq_res.pages = rqstp->rq_respages + 1;
859 rqstp->rq_res.len = 0;
860 rqstp->rq_res.page_base = 0;
861 rqstp->rq_res.page_len = 0;
862 rqstp->rq_res.buflen = PAGE_SIZE;
863 rqstp->rq_res.tail[0].iov_base = NULL;
864 rqstp->rq_res.tail[0].iov_len = 0;
865 /* Will be turned off only in gss privacy case: */
866 rqstp->rq_splice_ok = 1;
868 /* Setup reply header */
869 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
871 rqstp->rq_xid = svc_getu32(argv);
872 svc_putu32(resv, rqstp->rq_xid);
874 dir = svc_getnl(argv);
875 vers = svc_getnl(argv);
877 /* First words of reply: */
878 svc_putnl(resv, 1); /* REPLY */
880 if (dir != 0) /* direction != CALL */
882 if (vers != 2) /* RPC version number */
885 /* Save position in case we later decide to reject: */
886 reply_statp = resv->iov_base + resv->iov_len;
888 svc_putnl(resv, 0); /* ACCEPT */
890 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
891 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
892 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
894 progp = serv->sv_program;
896 for (progp = serv->sv_program; progp; progp = progp->pg_next)
897 if (prog == progp->pg_prog)
901 * Decode auth data, and add verifier to reply buffer.
902 * We do this before anything else in order to get a decent
905 auth_res = svc_authenticate(rqstp, &auth_stat);
906 /* Also give the program a chance to reject this call: */
907 if (auth_res == SVC_OK && progp) {
908 auth_stat = rpc_autherr_badcred;
909 auth_res = progp->pg_authenticate(rqstp);
917 rpc_stat = rpc_system_err;
930 if (vers >= progp->pg_nvers ||
931 !(versp = progp->pg_vers[vers]))
934 procp = versp->vs_proc + proc;
935 if (proc >= versp->vs_nproc || !procp->pc_func)
937 rqstp->rq_server = serv;
938 rqstp->rq_procinfo = procp;
940 /* Syntactic check complete */
941 serv->sv_stats->rpccnt++;
943 /* Build the reply header. */
944 statp = resv->iov_base +resv->iov_len;
945 svc_putnl(resv, RPC_SUCCESS);
947 /* Bump per-procedure stats counter */
950 /* Initialize storage for argp and resp */
951 memset(rqstp->rq_argp, 0, procp->pc_argsize);
952 memset(rqstp->rq_resp, 0, procp->pc_ressize);
954 /* un-reserve some of the out-queue now that we have a
955 * better idea of reply size
957 if (procp->pc_xdrressize)
958 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
960 /* Call the function that processes the request. */
961 if (!versp->vs_dispatch) {
962 /* Decode arguments */
963 xdr = procp->pc_decode;
964 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
967 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
970 if (*statp == rpc_drop_reply) {
971 if (procp->pc_release)
972 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
975 if (*statp == rpc_success && (xdr = procp->pc_encode)
976 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
977 dprintk("svc: failed to encode reply\n");
978 /* serv->sv_stats->rpcsystemerr++; */
979 *statp = rpc_system_err;
982 dprintk("svc: calling dispatcher\n");
983 if (!versp->vs_dispatch(rqstp, statp)) {
984 /* Release reply info */
985 if (procp->pc_release)
986 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
991 /* Check RPC status result */
992 if (*statp != rpc_success)
993 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
995 /* Release reply info */
996 if (procp->pc_release)
997 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
999 if (procp->pc_encode == NULL)
1003 if (svc_authorise(rqstp))
1005 return svc_send(rqstp);
1008 svc_authorise(rqstp); /* doesn't hurt to call this twice */
1009 dprintk("svc: svc_process dropit\n");
1014 svc_printk(rqstp, "short len %Zd, dropping request\n",
1017 goto dropit; /* drop request */
1020 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1022 serv->sv_stats->rpcbadfmt++;
1023 goto dropit; /* drop request */
1026 serv->sv_stats->rpcbadfmt++;
1027 svc_putnl(resv, 1); /* REJECT */
1028 svc_putnl(resv, 0); /* RPC_MISMATCH */
1029 svc_putnl(resv, 2); /* Only RPCv2 supported */
1034 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1035 serv->sv_stats->rpcbadauth++;
1036 /* Restore write pointer to location of accept status: */
1037 xdr_ressize_check(rqstp, reply_statp);
1038 svc_putnl(resv, 1); /* REJECT */
1039 svc_putnl(resv, 1); /* AUTH_ERROR */
1040 svc_putnl(resv, ntohl(auth_stat)); /* status */
1044 dprintk("svc: unknown program %d\n", prog);
1045 serv->sv_stats->rpcbadfmt++;
1046 svc_putnl(resv, RPC_PROG_UNAVAIL);
1050 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
1051 vers, prog, progp->pg_name);
1053 serv->sv_stats->rpcbadfmt++;
1054 svc_putnl(resv, RPC_PROG_MISMATCH);
1055 svc_putnl(resv, progp->pg_lovers);
1056 svc_putnl(resv, progp->pg_hivers);
1060 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
1062 serv->sv_stats->rpcbadfmt++;
1063 svc_putnl(resv, RPC_PROC_UNAVAIL);
1067 svc_printk(rqstp, "failed to decode args\n");
1069 rpc_stat = rpc_garbage_args;
1071 serv->sv_stats->rpcbadfmt++;
1072 svc_putnl(resv, ntohl(rpc_stat));
1075 EXPORT_SYMBOL(svc_process);
1078 * Return (transport-specific) limit on the rpc payload.
1080 u32 svc_max_payload(const struct svc_rqst *rqstp)
1082 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
1084 if (rqstp->rq_server->sv_max_payload < max)
1085 max = rqstp->rq_server->sv_max_payload;
1088 EXPORT_SYMBOL_GPL(svc_max_payload);