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 static void svc_unregister(const struct svc_serv *serv);
33 #define svc_serv_is_pooled(serv) ((serv)->sv_function)
36 * Mode for mapping cpus to pools.
39 SVC_POOL_AUTO = -1, /* choose one of the others */
40 SVC_POOL_GLOBAL, /* no mapping, just a single global pool
41 * (legacy & UP mode) */
42 SVC_POOL_PERCPU, /* one pool per cpu */
43 SVC_POOL_PERNODE /* one pool per numa node */
45 #define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
48 * Structure for mapping cpus to pools and vice versa.
49 * Setup once during sunrpc initialisation.
51 static struct svc_pool_map {
52 int count; /* How many svc_servs use us */
53 int mode; /* Note: int not enum to avoid
54 * warnings about "enumeration value
55 * not handled in switch" */
57 unsigned int *pool_to; /* maps pool id to cpu or node */
58 unsigned int *to_pool; /* maps cpu or node to pool id */
61 .mode = SVC_POOL_DEFAULT
63 static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
66 param_set_pool_mode(const char *val, struct kernel_param *kp)
68 int *ip = (int *)kp->arg;
69 struct svc_pool_map *m = &svc_pool_map;
72 mutex_lock(&svc_pool_map_mutex);
79 if (!strncmp(val, "auto", 4))
81 else if (!strncmp(val, "global", 6))
82 *ip = SVC_POOL_GLOBAL;
83 else if (!strncmp(val, "percpu", 6))
84 *ip = SVC_POOL_PERCPU;
85 else if (!strncmp(val, "pernode", 7))
86 *ip = SVC_POOL_PERNODE;
91 mutex_unlock(&svc_pool_map_mutex);
96 param_get_pool_mode(char *buf, struct kernel_param *kp)
98 int *ip = (int *)kp->arg;
103 return strlcpy(buf, "auto", 20);
104 case SVC_POOL_GLOBAL:
105 return strlcpy(buf, "global", 20);
106 case SVC_POOL_PERCPU:
107 return strlcpy(buf, "percpu", 20);
108 case SVC_POOL_PERNODE:
109 return strlcpy(buf, "pernode", 20);
111 return sprintf(buf, "%d", *ip);
115 module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
116 &svc_pool_map.mode, 0644);
119 * Detect best pool mapping mode heuristically,
120 * according to the machine's topology.
123 svc_pool_map_choose_mode(void)
127 if (num_online_nodes() > 1) {
129 * Actually have multiple NUMA nodes,
130 * so split pools on NUMA node boundaries
132 return SVC_POOL_PERNODE;
135 node = any_online_node(node_online_map);
136 if (nr_cpus_node(node) > 2) {
138 * Non-trivial SMP, or CONFIG_NUMA on
139 * non-NUMA hardware, e.g. with a generic
140 * x86_64 kernel on Xeons. In this case we
141 * want to divide the pools on cpu boundaries.
143 return SVC_POOL_PERCPU;
146 /* default: one global pool */
147 return SVC_POOL_GLOBAL;
151 * Allocate the to_pool[] and pool_to[] arrays.
152 * Returns 0 on success or an errno.
155 svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
157 m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
160 m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
173 * Initialise the pool map for SVC_POOL_PERCPU mode.
174 * Returns number of pools or <0 on error.
177 svc_pool_map_init_percpu(struct svc_pool_map *m)
179 unsigned int maxpools = nr_cpu_ids;
180 unsigned int pidx = 0;
184 err = svc_pool_map_alloc_arrays(m, maxpools);
188 for_each_online_cpu(cpu) {
189 BUG_ON(pidx > maxpools);
190 m->to_pool[cpu] = pidx;
191 m->pool_to[pidx] = cpu;
194 /* cpus brought online later all get mapped to pool0, sorry */
201 * Initialise the pool map for SVC_POOL_PERNODE mode.
202 * Returns number of pools or <0 on error.
205 svc_pool_map_init_pernode(struct svc_pool_map *m)
207 unsigned int maxpools = nr_node_ids;
208 unsigned int pidx = 0;
212 err = svc_pool_map_alloc_arrays(m, maxpools);
216 for_each_node_with_cpus(node) {
217 /* some architectures (e.g. SN2) have cpuless nodes */
218 BUG_ON(pidx > maxpools);
219 m->to_pool[node] = pidx;
220 m->pool_to[pidx] = node;
223 /* nodes brought online later all get mapped to pool0, sorry */
230 * Add a reference to the global map of cpus to pools (and
231 * vice versa). Initialise the map if we're the first user.
232 * Returns the number of pools.
235 svc_pool_map_get(void)
237 struct svc_pool_map *m = &svc_pool_map;
240 mutex_lock(&svc_pool_map_mutex);
243 mutex_unlock(&svc_pool_map_mutex);
247 if (m->mode == SVC_POOL_AUTO)
248 m->mode = svc_pool_map_choose_mode();
251 case SVC_POOL_PERCPU:
252 npools = svc_pool_map_init_percpu(m);
254 case SVC_POOL_PERNODE:
255 npools = svc_pool_map_init_pernode(m);
260 /* default, or memory allocation failure */
262 m->mode = SVC_POOL_GLOBAL;
266 mutex_unlock(&svc_pool_map_mutex);
272 * Drop a reference to the global map of cpus to pools.
273 * When the last reference is dropped, the map data is
274 * freed; this allows the sysadmin to change the pool
275 * mode using the pool_mode module option without
276 * rebooting or re-loading sunrpc.ko.
279 svc_pool_map_put(void)
281 struct svc_pool_map *m = &svc_pool_map;
283 mutex_lock(&svc_pool_map_mutex);
286 m->mode = SVC_POOL_DEFAULT;
292 mutex_unlock(&svc_pool_map_mutex);
297 * Set the given thread's cpus_allowed mask so that it
298 * will only run on cpus in the given pool.
301 svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
303 struct svc_pool_map *m = &svc_pool_map;
304 unsigned int node = m->pool_to[pidx];
307 * The caller checks for sv_nrpools > 1, which
308 * implies that we've been initialized.
310 BUG_ON(m->count == 0);
313 case SVC_POOL_PERCPU:
315 set_cpus_allowed_ptr(task, &cpumask_of_cpu(node));
318 case SVC_POOL_PERNODE:
320 node_to_cpumask_ptr(nodecpumask, node);
321 set_cpus_allowed_ptr(task, nodecpumask);
328 * Use the mapping mode to choose a pool for a given CPU.
329 * Used when enqueueing an incoming RPC. Always returns
330 * a non-NULL pool pointer.
333 svc_pool_for_cpu(struct svc_serv *serv, int cpu)
335 struct svc_pool_map *m = &svc_pool_map;
336 unsigned int pidx = 0;
339 * An uninitialised map happens in a pure client when
340 * lockd is brought up, so silently treat it the
341 * same as SVC_POOL_GLOBAL.
343 if (svc_serv_is_pooled(serv)) {
345 case SVC_POOL_PERCPU:
346 pidx = m->to_pool[cpu];
348 case SVC_POOL_PERNODE:
349 pidx = m->to_pool[cpu_to_node(cpu)];
353 return &serv->sv_pools[pidx % serv->sv_nrpools];
358 * Create an RPC service
360 static struct svc_serv *
361 __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
362 void (*shutdown)(struct svc_serv *serv))
364 struct svc_serv *serv;
366 unsigned int xdrsize;
369 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
371 serv->sv_name = prog->pg_name;
372 serv->sv_program = prog;
373 serv->sv_nrthreads = 1;
374 serv->sv_stats = prog->pg_stats;
375 if (bufsize > RPCSVC_MAXPAYLOAD)
376 bufsize = RPCSVC_MAXPAYLOAD;
377 serv->sv_max_payload = bufsize? bufsize : 4096;
378 serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
379 serv->sv_shutdown = shutdown;
382 prog->pg_lovers = prog->pg_nvers-1;
383 for (vers=0; vers<prog->pg_nvers ; vers++)
384 if (prog->pg_vers[vers]) {
385 prog->pg_hivers = vers;
386 if (prog->pg_lovers > vers)
387 prog->pg_lovers = vers;
388 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
389 xdrsize = prog->pg_vers[vers]->vs_xdrsize;
391 prog = prog->pg_next;
393 serv->sv_xdrsize = xdrsize;
394 INIT_LIST_HEAD(&serv->sv_tempsocks);
395 INIT_LIST_HEAD(&serv->sv_permsocks);
396 init_timer(&serv->sv_temptimer);
397 spin_lock_init(&serv->sv_lock);
399 serv->sv_nrpools = npools;
401 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
403 if (!serv->sv_pools) {
408 for (i = 0; i < serv->sv_nrpools; i++) {
409 struct svc_pool *pool = &serv->sv_pools[i];
411 dprintk("svc: initialising pool %u for %s\n",
415 INIT_LIST_HEAD(&pool->sp_threads);
416 INIT_LIST_HEAD(&pool->sp_sockets);
417 INIT_LIST_HEAD(&pool->sp_all_threads);
418 spin_lock_init(&pool->sp_lock);
421 /* Remove any stale portmap registrations */
422 svc_unregister(serv);
428 svc_create(struct svc_program *prog, unsigned int bufsize,
429 void (*shutdown)(struct svc_serv *serv))
431 return __svc_create(prog, bufsize, /*npools*/1, shutdown);
433 EXPORT_SYMBOL_GPL(svc_create);
436 svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
437 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, shutdown);
446 serv->sv_function = func;
447 serv->sv_module = mod;
452 EXPORT_SYMBOL_GPL(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 svc_unregister(serv);
491 kfree(serv->sv_pools);
494 EXPORT_SYMBOL_GPL(svc_destroy);
497 * Allocate an RPC server's buffer space.
498 * We allocate pages and place them in rq_argpages.
501 svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
503 unsigned int pages, arghi;
505 pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
506 * We assume one is at most one page
509 BUG_ON(pages > RPCSVC_MAXPAGES);
511 struct page *p = alloc_page(GFP_KERNEL);
514 rqstp->rq_pages[arghi++] = p;
521 * Release an RPC server buffer
524 svc_release_buffer(struct svc_rqst *rqstp)
528 for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
529 if (rqstp->rq_pages[i])
530 put_page(rqstp->rq_pages[i]);
534 svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool)
536 struct svc_rqst *rqstp;
538 rqstp = kzalloc(sizeof(*rqstp), GFP_KERNEL);
542 init_waitqueue_head(&rqstp->rq_wait);
544 serv->sv_nrthreads++;
545 spin_lock_bh(&pool->sp_lock);
546 pool->sp_nrthreads++;
547 list_add(&rqstp->rq_all, &pool->sp_all_threads);
548 spin_unlock_bh(&pool->sp_lock);
549 rqstp->rq_server = serv;
550 rqstp->rq_pool = pool;
552 rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
556 rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL);
560 if (!svc_init_buffer(rqstp, serv->sv_max_mesg))
565 svc_exit_thread(rqstp);
567 return ERR_PTR(-ENOMEM);
569 EXPORT_SYMBOL_GPL(svc_prepare_thread);
572 * Choose a pool in which to create a new thread, for svc_set_num_threads
574 static inline struct svc_pool *
575 choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
580 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
584 * Choose a thread to kill, for svc_set_num_threads
586 static inline struct task_struct *
587 choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
590 struct task_struct *task = NULL;
593 spin_lock_bh(&pool->sp_lock);
595 /* choose a pool in round-robin fashion */
596 for (i = 0; i < serv->sv_nrpools; i++) {
597 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
598 spin_lock_bh(&pool->sp_lock);
599 if (!list_empty(&pool->sp_all_threads))
601 spin_unlock_bh(&pool->sp_lock);
607 if (!list_empty(&pool->sp_all_threads)) {
608 struct svc_rqst *rqstp;
611 * Remove from the pool->sp_all_threads list
612 * so we don't try to kill it again.
614 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
615 list_del_init(&rqstp->rq_all);
616 task = rqstp->rq_task;
618 spin_unlock_bh(&pool->sp_lock);
624 * Create or destroy enough new threads to make the number
625 * of threads the given number. If `pool' is non-NULL, applies
626 * only to threads in that pool, otherwise round-robins between
627 * all pools. Must be called with a svc_get() reference and
628 * the BKL or another lock to protect access to svc_serv fields.
630 * Destroying threads relies on the service threads filling in
631 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
632 * has been created using svc_create_pooled().
634 * Based on code that used to be in nfsd_svc() but tweaked
638 svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
640 struct svc_rqst *rqstp;
641 struct task_struct *task;
642 struct svc_pool *chosen_pool;
644 unsigned int state = serv->sv_nrthreads-1;
647 /* The -1 assumes caller has done a svc_get() */
648 nrservs -= (serv->sv_nrthreads-1);
650 spin_lock_bh(&pool->sp_lock);
651 nrservs -= pool->sp_nrthreads;
652 spin_unlock_bh(&pool->sp_lock);
655 /* create new threads */
656 while (nrservs > 0) {
658 chosen_pool = choose_pool(serv, pool, &state);
660 rqstp = svc_prepare_thread(serv, chosen_pool);
662 error = PTR_ERR(rqstp);
666 __module_get(serv->sv_module);
667 task = kthread_create(serv->sv_function, rqstp, serv->sv_name);
669 error = PTR_ERR(task);
670 module_put(serv->sv_module);
671 svc_exit_thread(rqstp);
675 rqstp->rq_task = task;
676 if (serv->sv_nrpools > 1)
677 svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
679 svc_sock_update_bufs(serv);
680 wake_up_process(task);
682 /* destroy old threads */
683 while (nrservs < 0 &&
684 (task = choose_victim(serv, pool, &state)) != NULL) {
685 send_sig(SIGINT, task, 1);
691 EXPORT_SYMBOL_GPL(svc_set_num_threads);
694 * Called from a server thread as it's exiting. Caller must hold the BKL or
695 * the "service mutex", whichever is appropriate for the service.
698 svc_exit_thread(struct svc_rqst *rqstp)
700 struct svc_serv *serv = rqstp->rq_server;
701 struct svc_pool *pool = rqstp->rq_pool;
703 svc_release_buffer(rqstp);
704 kfree(rqstp->rq_resp);
705 kfree(rqstp->rq_argp);
706 kfree(rqstp->rq_auth_data);
708 spin_lock_bh(&pool->sp_lock);
709 pool->sp_nrthreads--;
710 list_del(&rqstp->rq_all);
711 spin_unlock_bh(&pool->sp_lock);
715 /* Release the server */
719 EXPORT_SYMBOL_GPL(svc_exit_thread);
722 * Register an "inet" protocol family netid with the local
723 * rpcbind daemon via an rpcbind v4 SET request.
725 * No netconfig infrastructure is available in the kernel, so
726 * we map IP_ protocol numbers to netids by hand.
728 * Returns zero on success; a negative errno value is returned
729 * if any error occurs.
731 static int __svc_rpcb_register4(const u32 program, const u32 version,
732 const unsigned short protocol,
733 const unsigned short port)
735 const struct sockaddr_in sin = {
736 .sin_family = AF_INET,
737 .sin_addr.s_addr = htonl(INADDR_ANY),
738 .sin_port = htons(port),
745 netid = RPCBIND_NETID_UDP;
748 netid = RPCBIND_NETID_TCP;
754 error = rpcb_v4_register(program, version,
755 (const struct sockaddr *)&sin, netid);
758 * User space didn't support rpcbind v4, so retry this
759 * registration request with the legacy rpcbind v2 protocol.
761 if (error == -EPROTONOSUPPORT)
762 error = rpcb_register(program, version, protocol, port);
767 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
769 * Register an "inet6" protocol family netid with the local
770 * rpcbind daemon via an rpcbind v4 SET request.
772 * No netconfig infrastructure is available in the kernel, so
773 * we map IP_ protocol numbers to netids by hand.
775 * Returns zero on success; a negative errno value is returned
776 * if any error occurs.
778 static int __svc_rpcb_register6(const u32 program, const u32 version,
779 const unsigned short protocol,
780 const unsigned short port)
782 const struct sockaddr_in6 sin6 = {
783 .sin6_family = AF_INET6,
784 .sin6_addr = IN6ADDR_ANY_INIT,
785 .sin6_port = htons(port),
792 netid = RPCBIND_NETID_UDP6;
795 netid = RPCBIND_NETID_TCP6;
801 error = rpcb_v4_register(program, version,
802 (const struct sockaddr *)&sin6, netid);
805 * User space didn't support rpcbind version 4, so we won't
806 * use a PF_INET6 listener.
808 if (error == -EPROTONOSUPPORT)
809 error = -EAFNOSUPPORT;
813 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
816 * Register a kernel RPC service via rpcbind version 4.
818 * Returns zero on success; a negative errno value is returned
819 * if any error occurs.
821 static int __svc_register(const u32 program, const u32 version,
823 const unsigned short protocol,
824 const unsigned short port)
830 return __svc_rpcb_register4(program, version,
833 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
835 return__svc_rpcb_register6(program, version,
837 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
840 return -EAFNOSUPPORT;
844 * svc_register - register an RPC service with the local portmapper
845 * @serv: svc_serv struct for the service to register
846 * @family: protocol family of service's listener socket
847 * @proto: transport protocol number to advertise
848 * @port: port to advertise
850 * Service is registered for any address in the passed-in protocol family
852 int svc_register(const struct svc_serv *serv, const int family,
853 const unsigned short proto, const unsigned short port)
855 struct svc_program *progp;
859 BUG_ON(proto == 0 && port == 0);
861 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
862 for (i = 0; i < progp->pg_nvers; i++) {
863 if (progp->pg_vers[i] == NULL)
866 dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
869 proto == IPPROTO_UDP? "udp" : "tcp",
872 progp->pg_vers[i]->vs_hidden?
873 " (but not telling portmap)" : "");
875 if (progp->pg_vers[i]->vs_hidden)
878 error = __svc_register(progp->pg_prog, i,
879 family, proto, port);
889 * If user space is running rpcbind, it should take the v4 UNSET
890 * and clear everything for this [program, version]. If user space
891 * is running portmap, it will reject the v4 UNSET, but won't have
892 * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient
893 * in this case to clear all existing entries for [program, version].
895 static void __svc_unregister(const u32 program, const u32 version,
896 const char *progname)
900 error = rpcb_v4_register(program, version, NULL, "");
903 * User space didn't support rpcbind v4, so retry this
904 * request with the legacy rpcbind v2 protocol.
906 if (error == -EPROTONOSUPPORT)
907 error = rpcb_register(program, version, 0, 0);
909 dprintk("svc: %s(%sv%u), error %d\n",
910 __func__, progname, version, error);
914 * All netids, bind addresses and ports registered for [program, version]
915 * are removed from the local rpcbind database (if the service is not
916 * hidden) to make way for a new instance of the service.
918 * The result of unregistration is reported via dprintk for those who want
919 * verification of the result, but is otherwise not important.
921 static void svc_unregister(const struct svc_serv *serv)
923 struct svc_program *progp;
927 clear_thread_flag(TIF_SIGPENDING);
929 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
930 for (i = 0; i < progp->pg_nvers; i++) {
931 if (progp->pg_vers[i] == NULL)
933 if (progp->pg_vers[i]->vs_hidden)
936 __svc_unregister(progp->pg_prog, i, progp->pg_name);
940 spin_lock_irqsave(¤t->sighand->siglock, flags);
942 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
946 * Printk the given error with the address of the client that caused it.
949 __attribute__ ((format (printf, 2, 3)))
950 svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
954 char buf[RPC_MAX_ADDRBUFLEN];
956 if (!net_ratelimit())
959 printk(KERN_WARNING "svc: %s: ",
960 svc_print_addr(rqstp, buf, sizeof(buf)));
963 r = vprintk(fmt, args);
970 * Process the RPC request.
973 svc_process(struct svc_rqst *rqstp)
975 struct svc_program *progp;
976 struct svc_version *versp = NULL; /* compiler food */
977 struct svc_procedure *procp = NULL;
978 struct kvec * argv = &rqstp->rq_arg.head[0];
979 struct kvec * resv = &rqstp->rq_res.head[0];
980 struct svc_serv *serv = rqstp->rq_server;
983 u32 dir, prog, vers, proc;
984 __be32 auth_stat, rpc_stat;
988 rpc_stat = rpc_success;
990 if (argv->iov_len < 6*4)
993 /* setup response xdr_buf.
994 * Initially it has just one page
996 rqstp->rq_resused = 1;
997 resv->iov_base = page_address(rqstp->rq_respages[0]);
999 rqstp->rq_res.pages = rqstp->rq_respages + 1;
1000 rqstp->rq_res.len = 0;
1001 rqstp->rq_res.page_base = 0;
1002 rqstp->rq_res.page_len = 0;
1003 rqstp->rq_res.buflen = PAGE_SIZE;
1004 rqstp->rq_res.tail[0].iov_base = NULL;
1005 rqstp->rq_res.tail[0].iov_len = 0;
1006 /* Will be turned off only in gss privacy case: */
1007 rqstp->rq_splice_ok = 1;
1009 /* Setup reply header */
1010 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
1012 rqstp->rq_xid = svc_getu32(argv);
1013 svc_putu32(resv, rqstp->rq_xid);
1015 dir = svc_getnl(argv);
1016 vers = svc_getnl(argv);
1018 /* First words of reply: */
1019 svc_putnl(resv, 1); /* REPLY */
1021 if (dir != 0) /* direction != CALL */
1023 if (vers != 2) /* RPC version number */
1026 /* Save position in case we later decide to reject: */
1027 reply_statp = resv->iov_base + resv->iov_len;
1029 svc_putnl(resv, 0); /* ACCEPT */
1031 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
1032 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
1033 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
1035 progp = serv->sv_program;
1037 for (progp = serv->sv_program; progp; progp = progp->pg_next)
1038 if (prog == progp->pg_prog)
1042 * Decode auth data, and add verifier to reply buffer.
1043 * We do this before anything else in order to get a decent
1046 auth_res = svc_authenticate(rqstp, &auth_stat);
1047 /* Also give the program a chance to reject this call: */
1048 if (auth_res == SVC_OK && progp) {
1049 auth_stat = rpc_autherr_badcred;
1050 auth_res = progp->pg_authenticate(rqstp);
1058 rpc_stat = rpc_system_err;
1071 if (vers >= progp->pg_nvers ||
1072 !(versp = progp->pg_vers[vers]))
1075 procp = versp->vs_proc + proc;
1076 if (proc >= versp->vs_nproc || !procp->pc_func)
1078 rqstp->rq_server = serv;
1079 rqstp->rq_procinfo = procp;
1081 /* Syntactic check complete */
1082 serv->sv_stats->rpccnt++;
1084 /* Build the reply header. */
1085 statp = resv->iov_base +resv->iov_len;
1086 svc_putnl(resv, RPC_SUCCESS);
1088 /* Bump per-procedure stats counter */
1091 /* Initialize storage for argp and resp */
1092 memset(rqstp->rq_argp, 0, procp->pc_argsize);
1093 memset(rqstp->rq_resp, 0, procp->pc_ressize);
1095 /* un-reserve some of the out-queue now that we have a
1096 * better idea of reply size
1098 if (procp->pc_xdrressize)
1099 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
1101 /* Call the function that processes the request. */
1102 if (!versp->vs_dispatch) {
1103 /* Decode arguments */
1104 xdr = procp->pc_decode;
1105 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
1108 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
1111 if (*statp == rpc_drop_reply) {
1112 if (procp->pc_release)
1113 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1116 if (*statp == rpc_success && (xdr = procp->pc_encode)
1117 && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
1118 dprintk("svc: failed to encode reply\n");
1119 /* serv->sv_stats->rpcsystemerr++; */
1120 *statp = rpc_system_err;
1123 dprintk("svc: calling dispatcher\n");
1124 if (!versp->vs_dispatch(rqstp, statp)) {
1125 /* Release reply info */
1126 if (procp->pc_release)
1127 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1132 /* Check RPC status result */
1133 if (*statp != rpc_success)
1134 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
1136 /* Release reply info */
1137 if (procp->pc_release)
1138 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1140 if (procp->pc_encode == NULL)
1144 if (svc_authorise(rqstp))
1146 return svc_send(rqstp);
1149 svc_authorise(rqstp); /* doesn't hurt to call this twice */
1150 dprintk("svc: svc_process dropit\n");
1155 svc_printk(rqstp, "short len %Zd, dropping request\n",
1158 goto dropit; /* drop request */
1161 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1163 serv->sv_stats->rpcbadfmt++;
1164 goto dropit; /* drop request */
1167 serv->sv_stats->rpcbadfmt++;
1168 svc_putnl(resv, 1); /* REJECT */
1169 svc_putnl(resv, 0); /* RPC_MISMATCH */
1170 svc_putnl(resv, 2); /* Only RPCv2 supported */
1175 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1176 serv->sv_stats->rpcbadauth++;
1177 /* Restore write pointer to location of accept status: */
1178 xdr_ressize_check(rqstp, reply_statp);
1179 svc_putnl(resv, 1); /* REJECT */
1180 svc_putnl(resv, 1); /* AUTH_ERROR */
1181 svc_putnl(resv, ntohl(auth_stat)); /* status */
1185 dprintk("svc: unknown program %d\n", prog);
1186 serv->sv_stats->rpcbadfmt++;
1187 svc_putnl(resv, RPC_PROG_UNAVAIL);
1191 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
1192 vers, prog, progp->pg_name);
1194 serv->sv_stats->rpcbadfmt++;
1195 svc_putnl(resv, RPC_PROG_MISMATCH);
1196 svc_putnl(resv, progp->pg_lovers);
1197 svc_putnl(resv, progp->pg_hivers);
1201 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
1203 serv->sv_stats->rpcbadfmt++;
1204 svc_putnl(resv, RPC_PROC_UNAVAIL);
1208 svc_printk(rqstp, "failed to decode args\n");
1210 rpc_stat = rpc_garbage_args;
1212 serv->sv_stats->rpcbadfmt++;
1213 svc_putnl(resv, ntohl(rpc_stat));
1216 EXPORT_SYMBOL_GPL(svc_process);
1219 * Return (transport-specific) limit on the rpc payload.
1221 u32 svc_max_payload(const struct svc_rqst *rqstp)
1223 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
1225 if (rqstp->rq_server->sv_max_payload < max)
1226 max = rqstp->rq_server->sv_max_payload;
1229 EXPORT_SYMBOL_GPL(svc_max_payload);