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
30 #define svc_serv_is_pooled(serv) ((serv)->sv_function)
33 * Mode for mapping cpus to pools.
36 SVC_POOL_AUTO = -1, /* choose one of the others */
37 SVC_POOL_GLOBAL, /* no mapping, just a single global pool
38 * (legacy & UP mode) */
39 SVC_POOL_PERCPU, /* one pool per cpu */
40 SVC_POOL_PERNODE /* one pool per numa node */
42 #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
45 * Structure for mapping cpus to pools and vice versa.
46 * Setup once during sunrpc initialisation.
48 static struct svc_pool_map {
49 int count; /* How many svc_servs use us */
50 int mode; /* Note: int not enum to avoid
51 * warnings about "enumeration value
52 * not handled in switch" */
54 unsigned int *pool_to; /* maps pool id to cpu or node */
55 unsigned int *to_pool; /* maps cpu or node to pool id */
58 .mode = SVC_POOL_DEFAULT
60 static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
63 param_set_pool_mode(const char *val, struct kernel_param *kp)
65 int *ip = (int *)kp->arg;
66 struct svc_pool_map *m = &svc_pool_map;
69 mutex_lock(&svc_pool_map_mutex);
76 if (!strncmp(val, "auto", 4))
78 else if (!strncmp(val, "global", 6))
79 *ip = SVC_POOL_GLOBAL;
80 else if (!strncmp(val, "percpu", 6))
81 *ip = SVC_POOL_PERCPU;
82 else if (!strncmp(val, "pernode", 7))
83 *ip = SVC_POOL_PERNODE;
88 mutex_unlock(&svc_pool_map_mutex);
93 param_get_pool_mode(char *buf, struct kernel_param *kp)
95 int *ip = (int *)kp->arg;
100 return strlcpy(buf, "auto", 20);
101 case SVC_POOL_GLOBAL:
102 return strlcpy(buf, "global", 20);
103 case SVC_POOL_PERCPU:
104 return strlcpy(buf, "percpu", 20);
105 case SVC_POOL_PERNODE:
106 return strlcpy(buf, "pernode", 20);
108 return sprintf(buf, "%d", *ip);
112 module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
113 &svc_pool_map.mode, 0644);
116 * Detect best pool mapping mode heuristically,
117 * according to the machine's topology.
120 svc_pool_map_choose_mode(void)
124 if (num_online_nodes() > 1) {
126 * Actually have multiple NUMA nodes,
127 * so split pools on NUMA node boundaries
129 return SVC_POOL_PERNODE;
132 node = any_online_node(node_online_map);
133 if (nr_cpus_node(node) > 2) {
135 * Non-trivial SMP, or CONFIG_NUMA on
136 * non-NUMA hardware, e.g. with a generic
137 * x86_64 kernel on Xeons. In this case we
138 * want to divide the pools on cpu boundaries.
140 return SVC_POOL_PERCPU;
143 /* default: one global pool */
144 return SVC_POOL_GLOBAL;
148 * Allocate the to_pool[] and pool_to[] arrays.
149 * Returns 0 on success or an errno.
152 svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
154 m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
157 m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
170 * Initialise the pool map for SVC_POOL_PERCPU mode.
171 * Returns number of pools or <0 on error.
174 svc_pool_map_init_percpu(struct svc_pool_map *m)
176 unsigned int maxpools = nr_cpu_ids;
177 unsigned int pidx = 0;
181 err = svc_pool_map_alloc_arrays(m, maxpools);
185 for_each_online_cpu(cpu) {
186 BUG_ON(pidx > maxpools);
187 m->to_pool[cpu] = pidx;
188 m->pool_to[pidx] = cpu;
191 /* cpus brought online later all get mapped to pool0, sorry */
198 * Initialise the pool map for SVC_POOL_PERNODE mode.
199 * Returns number of pools or <0 on error.
202 svc_pool_map_init_pernode(struct svc_pool_map *m)
204 unsigned int maxpools = nr_node_ids;
205 unsigned int pidx = 0;
209 err = svc_pool_map_alloc_arrays(m, maxpools);
213 for_each_node_with_cpus(node) {
214 /* some architectures (e.g. SN2) have cpuless nodes */
215 BUG_ON(pidx > maxpools);
216 m->to_pool[node] = pidx;
217 m->pool_to[pidx] = node;
220 /* nodes brought online later all get mapped to pool0, sorry */
227 * Add a reference to the global map of cpus to pools (and
228 * vice versa). Initialise the map if we're the first user.
229 * Returns the number of pools.
232 svc_pool_map_get(void)
234 struct svc_pool_map *m = &svc_pool_map;
237 mutex_lock(&svc_pool_map_mutex);
240 mutex_unlock(&svc_pool_map_mutex);
244 if (m->mode == SVC_POOL_AUTO)
245 m->mode = svc_pool_map_choose_mode();
248 case SVC_POOL_PERCPU:
249 npools = svc_pool_map_init_percpu(m);
251 case SVC_POOL_PERNODE:
252 npools = svc_pool_map_init_pernode(m);
257 /* default, or memory allocation failure */
259 m->mode = SVC_POOL_GLOBAL;
263 mutex_unlock(&svc_pool_map_mutex);
269 * Drop a reference to the global map of cpus to pools.
270 * When the last reference is dropped, the map data is
271 * freed; this allows the sysadmin to change the pool
272 * mode using the pool_mode module option without
273 * rebooting or re-loading sunrpc.ko.
276 svc_pool_map_put(void)
278 struct svc_pool_map *m = &svc_pool_map;
280 mutex_lock(&svc_pool_map_mutex);
283 m->mode = SVC_POOL_DEFAULT;
289 mutex_unlock(&svc_pool_map_mutex);
294 * Set the current thread's cpus_allowed mask so that it
295 * will only run on cpus in the given pool.
297 * Returns 1 and fills in oldmask iff a cpumask was applied.
300 svc_pool_map_set_cpumask(unsigned int pidx, cpumask_t *oldmask)
302 struct svc_pool_map *m = &svc_pool_map;
305 * The caller checks for sv_nrpools > 1, which
306 * implies that we've been initialized.
308 BUG_ON(m->count == 0);
314 case SVC_POOL_PERCPU:
316 unsigned int cpu = m->pool_to[pidx];
318 *oldmask = current->cpus_allowed;
319 set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
322 case SVC_POOL_PERNODE:
324 unsigned int node = m->pool_to[pidx];
325 node_to_cpumask_ptr(nodecpumask, node);
327 *oldmask = current->cpus_allowed;
328 set_cpus_allowed_ptr(current, nodecpumask);
335 * Use the mapping mode to choose a pool for a given CPU.
336 * Used when enqueueing an incoming RPC. Always returns
337 * a non-NULL pool pointer.
340 svc_pool_for_cpu(struct svc_serv *serv, int cpu)
342 struct svc_pool_map *m = &svc_pool_map;
343 unsigned int pidx = 0;
346 * An uninitialised map happens in a pure client when
347 * lockd is brought up, so silently treat it the
348 * same as SVC_POOL_GLOBAL.
350 if (svc_serv_is_pooled(serv)) {
352 case SVC_POOL_PERCPU:
353 pidx = m->to_pool[cpu];
355 case SVC_POOL_PERNODE:
356 pidx = m->to_pool[cpu_to_node(cpu)];
360 return &serv->sv_pools[pidx % serv->sv_nrpools];
365 * Create an RPC service
367 static struct svc_serv *
368 __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
369 void (*shutdown)(struct svc_serv *serv))
371 struct svc_serv *serv;
373 unsigned int xdrsize;
376 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
378 serv->sv_name = prog->pg_name;
379 serv->sv_program = prog;
380 serv->sv_nrthreads = 1;
381 serv->sv_stats = prog->pg_stats;
382 if (bufsize > RPCSVC_MAXPAYLOAD)
383 bufsize = RPCSVC_MAXPAYLOAD;
384 serv->sv_max_payload = bufsize? bufsize : 4096;
385 serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
386 serv->sv_shutdown = shutdown;
389 prog->pg_lovers = prog->pg_nvers-1;
390 for (vers=0; vers<prog->pg_nvers ; vers++)
391 if (prog->pg_vers[vers]) {
392 prog->pg_hivers = vers;
393 if (prog->pg_lovers > vers)
394 prog->pg_lovers = vers;
395 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
396 xdrsize = prog->pg_vers[vers]->vs_xdrsize;
398 prog = prog->pg_next;
400 serv->sv_xdrsize = xdrsize;
401 INIT_LIST_HEAD(&serv->sv_tempsocks);
402 INIT_LIST_HEAD(&serv->sv_permsocks);
403 init_timer(&serv->sv_temptimer);
404 spin_lock_init(&serv->sv_lock);
406 serv->sv_nrpools = npools;
408 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
410 if (!serv->sv_pools) {
415 for (i = 0; i < serv->sv_nrpools; i++) {
416 struct svc_pool *pool = &serv->sv_pools[i];
418 dprintk("svc: initialising pool %u for %s\n",
422 INIT_LIST_HEAD(&pool->sp_threads);
423 INIT_LIST_HEAD(&pool->sp_sockets);
424 INIT_LIST_HEAD(&pool->sp_all_threads);
425 spin_lock_init(&pool->sp_lock);
429 /* Remove any stale portmap registrations */
430 svc_register(serv, 0, 0);
436 svc_create(struct svc_program *prog, unsigned int bufsize,
437 void (*shutdown)(struct svc_serv *serv))
439 return __svc_create(prog, bufsize, /*npools*/1, shutdown);
441 EXPORT_SYMBOL(svc_create);
444 svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
445 void (*shutdown)(struct svc_serv *serv),
446 svc_thread_fn func, int sig, struct module *mod)
448 struct svc_serv *serv;
449 unsigned int npools = svc_pool_map_get();
451 serv = __svc_create(prog, bufsize, npools, shutdown);
454 serv->sv_function = func;
455 serv->sv_kill_signal = sig;
456 serv->sv_module = mod;
461 EXPORT_SYMBOL(svc_create_pooled);
464 * Destroy an RPC service. Should be called with appropriate locking to
465 * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
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 or another lock to
583 * serialize access to the svc_serv struct. On a NUMA or SMP machine, with a
584 * multi-pool serv, the thread will be restricted to run on the cpus belonging
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
679 * the BKL or another lock to protect access to svc_serv fields.
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 the BKL or
728 * the "service mutex", whichever is appropriate for the service.
731 svc_exit_thread(struct svc_rqst *rqstp)
733 struct svc_serv *serv = rqstp->rq_server;
734 struct svc_pool *pool = rqstp->rq_pool;
736 svc_release_buffer(rqstp);
737 kfree(rqstp->rq_resp);
738 kfree(rqstp->rq_argp);
739 kfree(rqstp->rq_auth_data);
741 spin_lock_bh(&pool->sp_lock);
742 pool->sp_nrthreads--;
743 list_del(&rqstp->rq_all);
744 spin_unlock_bh(&pool->sp_lock);
748 /* Release the server */
752 EXPORT_SYMBOL(svc_exit_thread);
755 * Register an RPC service with the local portmapper.
756 * To unregister a service, call this routine with
757 * proto and port == 0.
760 svc_register(struct svc_serv *serv, int proto, unsigned short port)
762 struct svc_program *progp;
765 int error = 0, dummy;
768 clear_thread_flag(TIF_SIGPENDING);
770 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
771 for (i = 0; i < progp->pg_nvers; i++) {
772 if (progp->pg_vers[i] == NULL)
775 dprintk("svc: svc_register(%s, %s, %d, %d)%s\n",
777 proto == IPPROTO_UDP? "udp" : "tcp",
780 progp->pg_vers[i]->vs_hidden?
781 " (but not telling portmap)" : "");
783 if (progp->pg_vers[i]->vs_hidden)
786 error = rpcb_register(progp->pg_prog, i, proto, port, &dummy);
789 if (port && !dummy) {
797 spin_lock_irqsave(¤t->sighand->siglock, flags);
799 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
806 * Printk the given error with the address of the client that caused it.
809 __attribute__ ((format (printf, 2, 3)))
810 svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
814 char buf[RPC_MAX_ADDRBUFLEN];
816 if (!net_ratelimit())
819 printk(KERN_WARNING "svc: %s: ",
820 svc_print_addr(rqstp, buf, sizeof(buf)));
823 r = vprintk(fmt, args);
830 * Process the RPC request.
833 svc_process(struct svc_rqst *rqstp)
835 struct svc_program *progp;
836 struct svc_version *versp = NULL; /* compiler food */
837 struct svc_procedure *procp = NULL;
838 struct kvec * argv = &rqstp->rq_arg.head[0];
839 struct kvec * resv = &rqstp->rq_res.head[0];
840 struct svc_serv *serv = rqstp->rq_server;
843 u32 dir, prog, vers, proc;
844 __be32 auth_stat, rpc_stat;
848 rpc_stat = rpc_success;
850 if (argv->iov_len < 6*4)
853 /* setup response xdr_buf.
854 * Initially it has just one page
856 rqstp->rq_resused = 1;
857 resv->iov_base = page_address(rqstp->rq_respages[0]);
859 rqstp->rq_res.pages = rqstp->rq_respages + 1;
860 rqstp->rq_res.len = 0;
861 rqstp->rq_res.page_base = 0;
862 rqstp->rq_res.page_len = 0;
863 rqstp->rq_res.buflen = PAGE_SIZE;
864 rqstp->rq_res.tail[0].iov_base = NULL;
865 rqstp->rq_res.tail[0].iov_len = 0;
866 /* Will be turned off only in gss privacy case: */
867 rqstp->rq_splice_ok = 1;
869 /* Setup reply header */
870 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
872 rqstp->rq_xid = svc_getu32(argv);
873 svc_putu32(resv, rqstp->rq_xid);
875 dir = svc_getnl(argv);
876 vers = svc_getnl(argv);
878 /* First words of reply: */
879 svc_putnl(resv, 1); /* REPLY */
881 if (dir != 0) /* direction != CALL */
883 if (vers != 2) /* RPC version number */
886 /* Save position in case we later decide to reject: */
887 reply_statp = resv->iov_base + resv->iov_len;
889 svc_putnl(resv, 0); /* ACCEPT */
891 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
892 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
893 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
895 progp = serv->sv_program;
897 for (progp = serv->sv_program; progp; progp = progp->pg_next)
898 if (prog == progp->pg_prog)
902 * Decode auth data, and add verifier to reply buffer.
903 * We do this before anything else in order to get a decent
906 auth_res = svc_authenticate(rqstp, &auth_stat);
907 /* Also give the program a chance to reject this call: */
908 if (auth_res == SVC_OK && progp) {
909 auth_stat = rpc_autherr_badcred;
910 auth_res = progp->pg_authenticate(rqstp);
918 rpc_stat = rpc_system_err;
931 if (vers >= progp->pg_nvers ||
932 !(versp = progp->pg_vers[vers]))
935 procp = versp->vs_proc + proc;
936 if (proc >= versp->vs_nproc || !procp->pc_func)
938 rqstp->rq_server = serv;
939 rqstp->rq_procinfo = procp;
941 /* Syntactic check complete */
942 serv->sv_stats->rpccnt++;
944 /* Build the reply header. */
945 statp = resv->iov_base +resv->iov_len;
946 svc_putnl(resv, RPC_SUCCESS);
948 /* Bump per-procedure stats counter */
951 /* Initialize storage for argp and resp */
952 memset(rqstp->rq_argp, 0, procp->pc_argsize);
953 memset(rqstp->rq_resp, 0, procp->pc_ressize);
955 /* un-reserve some of the out-queue now that we have a
956 * better idea of reply size
958 if (procp->pc_xdrressize)
959 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
961 /* Call the function that processes the request. */
962 if (!versp->vs_dispatch) {
963 /* Decode arguments */
964 xdr = procp->pc_decode;
965 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
968 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
971 if (*statp == rpc_drop_reply) {
972 if (procp->pc_release)
973 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
976 if (*statp == rpc_success && (xdr = procp->pc_encode)
977 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
978 dprintk("svc: failed to encode reply\n");
979 /* serv->sv_stats->rpcsystemerr++; */
980 *statp = rpc_system_err;
983 dprintk("svc: calling dispatcher\n");
984 if (!versp->vs_dispatch(rqstp, statp)) {
985 /* Release reply info */
986 if (procp->pc_release)
987 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
992 /* Check RPC status result */
993 if (*statp != rpc_success)
994 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
996 /* Release reply info */
997 if (procp->pc_release)
998 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1000 if (procp->pc_encode == NULL)
1004 if (svc_authorise(rqstp))
1006 return svc_send(rqstp);
1009 svc_authorise(rqstp); /* doesn't hurt to call this twice */
1010 dprintk("svc: svc_process dropit\n");
1015 svc_printk(rqstp, "short len %Zd, dropping request\n",
1018 goto dropit; /* drop request */
1021 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1023 serv->sv_stats->rpcbadfmt++;
1024 goto dropit; /* drop request */
1027 serv->sv_stats->rpcbadfmt++;
1028 svc_putnl(resv, 1); /* REJECT */
1029 svc_putnl(resv, 0); /* RPC_MISMATCH */
1030 svc_putnl(resv, 2); /* Only RPCv2 supported */
1035 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1036 serv->sv_stats->rpcbadauth++;
1037 /* Restore write pointer to location of accept status: */
1038 xdr_ressize_check(rqstp, reply_statp);
1039 svc_putnl(resv, 1); /* REJECT */
1040 svc_putnl(resv, 1); /* AUTH_ERROR */
1041 svc_putnl(resv, ntohl(auth_stat)); /* status */
1045 dprintk("svc: unknown program %d\n", prog);
1046 serv->sv_stats->rpcbadfmt++;
1047 svc_putnl(resv, RPC_PROG_UNAVAIL);
1051 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
1052 vers, prog, progp->pg_name);
1054 serv->sv_stats->rpcbadfmt++;
1055 svc_putnl(resv, RPC_PROG_MISMATCH);
1056 svc_putnl(resv, progp->pg_lovers);
1057 svc_putnl(resv, progp->pg_hivers);
1061 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
1063 serv->sv_stats->rpcbadfmt++;
1064 svc_putnl(resv, RPC_PROC_UNAVAIL);
1068 svc_printk(rqstp, "failed to decode args\n");
1070 rpc_stat = rpc_garbage_args;
1072 serv->sv_stats->rpcbadfmt++;
1073 svc_putnl(resv, ntohl(rpc_stat));
1076 EXPORT_SYMBOL(svc_process);
1079 * Return (transport-specific) limit on the rpc payload.
1081 u32 svc_max_payload(const struct svc_rqst *rqstp)
1083 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
1085 if (rqstp->rq_server->sv_max_payload < max)
1086 max = rqstp->rq_server->sv_max_payload;
1089 EXPORT_SYMBOL_GPL(svc_max_payload);