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)
513 unsigned int pages, arghi;
515 pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
516 * We assume one is at most one page
519 BUG_ON(pages > RPCSVC_MAXPAGES);
521 struct page *p = alloc_page(GFP_KERNEL);
524 rqstp->rq_pages[arghi++] = p;
531 * Release an RPC server buffer
534 svc_release_buffer(struct svc_rqst *rqstp)
538 for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
539 if (rqstp->rq_pages[i])
540 put_page(rqstp->rq_pages[i]);
544 svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
546 struct svc_rqst *rqstp;
548 rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
552 init_waitqueue_head(&rqstp->rq_wait);
554 serv->sv_nrthreads++;
555 spin_lock_bh(&pool->sp_lock);
556 pool->sp_nrthreads++;
557 list_add(&rqstp->rq_all, &pool->sp_all_threads);
558 spin_unlock_bh(&pool->sp_lock);
559 rqstp->rq_server = serv;
560 rqstp->rq_pool = pool;
562 rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
566 rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
570 if (!svc_init_buffer(rqstp, serv->sv_max_mesg))
575 svc_exit_thread(rqstp);
577 return ERR_PTR(-ENOMEM);
579 EXPORT_SYMBOL(svc_prepare_thread);
582 * Create a thread in the given pool. Caller must hold BKL.
583 * On a NUMA or SMP machine, with a multi-pool serv, the thread
584 * will be restricted to run on the cpus belonging to the pool.
587 __svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
588 struct svc_pool *pool)
590 struct svc_rqst *rqstp;
592 int have_oldmask = 0;
593 cpumask_t uninitialized_var(oldmask);
595 rqstp = svc_prepare_thread(serv, pool);
597 error = PTR_ERR(rqstp);
601 if (serv->sv_nrpools > 1)
602 have_oldmask = svc_pool_map_set_cpumask(pool->sp_id, &oldmask);
604 error = kernel_thread((int (*)(void *)) func, rqstp, 0);
607 set_cpus_allowed(current, oldmask);
611 svc_sock_update_bufs(serv);
617 svc_exit_thread(rqstp);
622 * Choose a pool in which to create a new thread, for svc_set_num_threads
624 static inline struct svc_pool *
625 choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
630 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
634 * Choose a thread to kill, for svc_set_num_threads
636 static inline struct task_struct *
637 choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
640 struct task_struct *task = NULL;
643 spin_lock_bh(&pool->sp_lock);
645 /* choose a pool in round-robin fashion */
646 for (i = 0; i < serv->sv_nrpools; i++) {
647 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
648 spin_lock_bh(&pool->sp_lock);
649 if (!list_empty(&pool->sp_all_threads))
651 spin_unlock_bh(&pool->sp_lock);
657 if (!list_empty(&pool->sp_all_threads)) {
658 struct svc_rqst *rqstp;
661 * Remove from the pool->sp_all_threads list
662 * so we don't try to kill it again.
664 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
665 list_del_init(&rqstp->rq_all);
666 task = rqstp->rq_task;
668 spin_unlock_bh(&pool->sp_lock);
674 * Create or destroy enough new threads to make the number
675 * of threads the given number. If `pool' is non-NULL, applies
676 * only to threads in that pool, otherwise round-robins between
677 * all pools. Must be called with a svc_get() reference and
680 * Destroying threads relies on the service threads filling in
681 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
682 * has been created using svc_create_pooled().
684 * Based on code that used to be in nfsd_svc() but tweaked
688 svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
690 struct task_struct *victim;
692 unsigned int state = serv->sv_nrthreads-1;
695 /* The -1 assumes caller has done a svc_get() */
696 nrservs -= (serv->sv_nrthreads-1);
698 spin_lock_bh(&pool->sp_lock);
699 nrservs -= pool->sp_nrthreads;
700 spin_unlock_bh(&pool->sp_lock);
703 /* create new threads */
704 while (nrservs > 0) {
706 __module_get(serv->sv_module);
707 error = __svc_create_thread(serv->sv_function, serv,
708 choose_pool(serv, pool, &state));
710 module_put(serv->sv_module);
714 /* destroy old threads */
715 while (nrservs < 0 &&
716 (victim = choose_victim(serv, pool, &state)) != NULL) {
717 send_sig(serv->sv_kill_signal, victim, 1);
723 EXPORT_SYMBOL(svc_set_num_threads);
726 * Called from a server thread as it's exiting. Caller must hold BKL.
729 svc_exit_thread(struct svc_rqst *rqstp)
731 struct svc_serv *serv = rqstp->rq_server;
732 struct svc_pool *pool = rqstp->rq_pool;
734 svc_release_buffer(rqstp);
735 kfree(rqstp->rq_resp);
736 kfree(rqstp->rq_argp);
737 kfree(rqstp->rq_auth_data);
739 spin_lock_bh(&pool->sp_lock);
740 pool->sp_nrthreads--;
741 list_del(&rqstp->rq_all);
742 spin_unlock_bh(&pool->sp_lock);
746 /* Release the server */
750 EXPORT_SYMBOL(svc_exit_thread);
753 * Register an RPC service with the local portmapper.
754 * To unregister a service, call this routine with
755 * proto and port == 0.
758 svc_register(struct svc_serv *serv, int proto, unsigned short port)
760 struct svc_program *progp;
763 int error = 0, dummy;
766 clear_thread_flag(TIF_SIGPENDING);
768 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
769 for (i = 0; i < progp->pg_nvers; i++) {
770 if (progp->pg_vers[i] == NULL)
773 dprintk("svc: svc_register(%s, %s, %d, %d)%s\n",
775 proto == IPPROTO_UDP? "udp" : "tcp",
778 progp->pg_vers[i]->vs_hidden?
779 " (but not telling portmap)" : "");
781 if (progp->pg_vers[i]->vs_hidden)
784 error = rpcb_register(progp->pg_prog, i, proto, port, &dummy);
787 if (port && !dummy) {
795 spin_lock_irqsave(¤t->sighand->siglock, flags);
797 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
804 * Printk the given error with the address of the client that caused it.
807 __attribute__ ((format (printf, 2, 3)))
808 svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
812 char buf[RPC_MAX_ADDRBUFLEN];
814 if (!net_ratelimit())
817 printk(KERN_WARNING "svc: %s: ",
818 svc_print_addr(rqstp, buf, sizeof(buf)));
821 r = vprintk(fmt, args);
828 * Process the RPC request.
831 svc_process(struct svc_rqst *rqstp)
833 struct svc_program *progp;
834 struct svc_version *versp = NULL; /* compiler food */
835 struct svc_procedure *procp = NULL;
836 struct kvec * argv = &rqstp->rq_arg.head[0];
837 struct kvec * resv = &rqstp->rq_res.head[0];
838 struct svc_serv *serv = rqstp->rq_server;
841 u32 dir, prog, vers, proc;
842 __be32 auth_stat, rpc_stat;
846 rpc_stat = rpc_success;
848 if (argv->iov_len < 6*4)
851 /* setup response xdr_buf.
852 * Initially it has just one page
854 rqstp->rq_resused = 1;
855 resv->iov_base = page_address(rqstp->rq_respages[0]);
857 rqstp->rq_res.pages = rqstp->rq_respages + 1;
858 rqstp->rq_res.len = 0;
859 rqstp->rq_res.page_base = 0;
860 rqstp->rq_res.page_len = 0;
861 rqstp->rq_res.buflen = PAGE_SIZE;
862 rqstp->rq_res.tail[0].iov_base = NULL;
863 rqstp->rq_res.tail[0].iov_len = 0;
864 /* Will be turned off only in gss privacy case: */
865 rqstp->rq_splice_ok = 1;
867 /* Setup reply header */
868 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
870 rqstp->rq_xid = svc_getu32(argv);
871 svc_putu32(resv, rqstp->rq_xid);
873 dir = svc_getnl(argv);
874 vers = svc_getnl(argv);
876 /* First words of reply: */
877 svc_putnl(resv, 1); /* REPLY */
879 if (dir != 0) /* direction != CALL */
881 if (vers != 2) /* RPC version number */
884 /* Save position in case we later decide to reject: */
885 reply_statp = resv->iov_base + resv->iov_len;
887 svc_putnl(resv, 0); /* ACCEPT */
889 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
890 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
891 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
893 progp = serv->sv_program;
895 for (progp = serv->sv_program; progp; progp = progp->pg_next)
896 if (prog == progp->pg_prog)
900 * Decode auth data, and add verifier to reply buffer.
901 * We do this before anything else in order to get a decent
904 auth_res = svc_authenticate(rqstp, &auth_stat);
905 /* Also give the program a chance to reject this call: */
906 if (auth_res == SVC_OK && progp) {
907 auth_stat = rpc_autherr_badcred;
908 auth_res = progp->pg_authenticate(rqstp);
916 rpc_stat = rpc_system_err;
929 if (vers >= progp->pg_nvers ||
930 !(versp = progp->pg_vers[vers]))
933 procp = versp->vs_proc + proc;
934 if (proc >= versp->vs_nproc || !procp->pc_func)
936 rqstp->rq_server = serv;
937 rqstp->rq_procinfo = procp;
939 /* Syntactic check complete */
940 serv->sv_stats->rpccnt++;
942 /* Build the reply header. */
943 statp = resv->iov_base +resv->iov_len;
944 svc_putnl(resv, RPC_SUCCESS);
946 /* Bump per-procedure stats counter */
949 /* Initialize storage for argp and resp */
950 memset(rqstp->rq_argp, 0, procp->pc_argsize);
951 memset(rqstp->rq_resp, 0, procp->pc_ressize);
953 /* un-reserve some of the out-queue now that we have a
954 * better idea of reply size
956 if (procp->pc_xdrressize)
957 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
959 /* Call the function that processes the request. */
960 if (!versp->vs_dispatch) {
961 /* Decode arguments */
962 xdr = procp->pc_decode;
963 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
966 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
969 if (*statp == rpc_drop_reply) {
970 if (procp->pc_release)
971 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
974 if (*statp == rpc_success && (xdr = procp->pc_encode)
975 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
976 dprintk("svc: failed to encode reply\n");
977 /* serv->sv_stats->rpcsystemerr++; */
978 *statp = rpc_system_err;
981 dprintk("svc: calling dispatcher\n");
982 if (!versp->vs_dispatch(rqstp, statp)) {
983 /* Release reply info */
984 if (procp->pc_release)
985 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
990 /* Check RPC status result */
991 if (*statp != rpc_success)
992 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
994 /* Release reply info */
995 if (procp->pc_release)
996 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
998 if (procp->pc_encode == NULL)
1002 if (svc_authorise(rqstp))
1004 return svc_send(rqstp);
1007 svc_authorise(rqstp); /* doesn't hurt to call this twice */
1008 dprintk("svc: svc_process dropit\n");
1013 svc_printk(rqstp, "short len %Zd, dropping request\n",
1016 goto dropit; /* drop request */
1019 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1021 serv->sv_stats->rpcbadfmt++;
1022 goto dropit; /* drop request */
1025 serv->sv_stats->rpcbadfmt++;
1026 svc_putnl(resv, 1); /* REJECT */
1027 svc_putnl(resv, 0); /* RPC_MISMATCH */
1028 svc_putnl(resv, 2); /* Only RPCv2 supported */
1033 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1034 serv->sv_stats->rpcbadauth++;
1035 /* Restore write pointer to location of accept status: */
1036 xdr_ressize_check(rqstp, reply_statp);
1037 svc_putnl(resv, 1); /* REJECT */
1038 svc_putnl(resv, 1); /* AUTH_ERROR */
1039 svc_putnl(resv, ntohl(auth_stat)); /* status */
1043 dprintk("svc: unknown program %d\n", prog);
1044 serv->sv_stats->rpcbadfmt++;
1045 svc_putnl(resv, RPC_PROG_UNAVAIL);
1049 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
1050 vers, prog, progp->pg_name);
1052 serv->sv_stats->rpcbadfmt++;
1053 svc_putnl(resv, RPC_PROG_MISMATCH);
1054 svc_putnl(resv, progp->pg_lovers);
1055 svc_putnl(resv, progp->pg_hivers);
1059 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
1061 serv->sv_stats->rpcbadfmt++;
1062 svc_putnl(resv, RPC_PROC_UNAVAIL);
1066 svc_printk(rqstp, "failed to decode args\n");
1068 rpc_stat = rpc_garbage_args;
1070 serv->sv_stats->rpcbadfmt++;
1071 svc_putnl(resv, ntohl(rpc_stat));
1074 EXPORT_SYMBOL(svc_process);
1077 * Return (transport-specific) limit on the rpc payload.
1079 u32 svc_max_payload(const struct svc_rqst *rqstp)
1081 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
1083 if (rqstp->rq_server->sv_max_payload < max)
1084 max = rqstp->rq_server->sv_max_payload;
1087 EXPORT_SYMBOL_GPL(svc_max_payload);