blob: 3ee7461926d8a01318ed2876e37651506c6b3c4b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/net/sunrpc/svc.c
3 *
4 * High-level RPC service routines
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
Greg Banksbfd24162006-10-02 02:18:01 -07007 *
8 * Multiple threads pools and NUMAisation
9 * Copyright (c) 2006 Silicon Graphics, Inc.
10 * by Greg Banks <gnb@melbourne.sgi.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12
13#include <linux/linkage.h>
14#include <linux/sched.h>
15#include <linux/errno.h>
16#include <linux/net.h>
17#include <linux/in.h>
18#include <linux/mm.h>
Greg Banksa7455442006-10-02 02:17:59 -070019#include <linux/interrupt.h>
20#include <linux/module.h>
Jeff Layton9867d762008-06-10 08:40:38 -040021#include <linux/kthread.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Stanislav Kinsburskybee42f682012-01-13 14:02:56 +040023#include <linux/nsproxy.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#include <linux/sunrpc/types.h>
26#include <linux/sunrpc/xdr.h>
27#include <linux/sunrpc/stats.h>
28#include <linux/sunrpc/svcsock.h>
29#include <linux/sunrpc/clnt.h>
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -040030#include <linux/sunrpc/bc_xprt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32#define RPCDBG_FACILITY RPCDBG_SVCDSP
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +040034static void svc_unregister(const struct svc_serv *serv, struct net *net);
Chuck Lever7252d572008-08-18 19:34:08 -040035
Greg Banks42a7fc42007-03-06 01:42:23 -080036#define svc_serv_is_pooled(serv) ((serv)->sv_function)
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038/*
Greg Banksbfd24162006-10-02 02:18:01 -070039 * Mode for mapping cpus to pools.
40 */
41enum {
Greg Banks42a7fc42007-03-06 01:42:23 -080042 SVC_POOL_AUTO = -1, /* choose one of the others */
Greg Banksbfd24162006-10-02 02:18:01 -070043 SVC_POOL_GLOBAL, /* no mapping, just a single global pool
44 * (legacy & UP mode) */
45 SVC_POOL_PERCPU, /* one pool per cpu */
46 SVC_POOL_PERNODE /* one pool per numa node */
47};
Greg Banks42a7fc42007-03-06 01:42:23 -080048#define SVC_POOL_DEFAULT SVC_POOL_GLOBAL
Greg Banksbfd24162006-10-02 02:18:01 -070049
50/*
51 * Structure for mapping cpus to pools and vice versa.
52 * Setup once during sunrpc initialisation.
53 */
54static struct svc_pool_map {
Greg Banks42a7fc42007-03-06 01:42:23 -080055 int count; /* How many svc_servs use us */
Greg Banksbfd24162006-10-02 02:18:01 -070056 int mode; /* Note: int not enum to avoid
57 * warnings about "enumeration value
58 * not handled in switch" */
59 unsigned int npools;
60 unsigned int *pool_to; /* maps pool id to cpu or node */
61 unsigned int *to_pool; /* maps cpu or node to pool id */
62} svc_pool_map = {
Greg Banks42a7fc42007-03-06 01:42:23 -080063 .count = 0,
64 .mode = SVC_POOL_DEFAULT
Greg Banksbfd24162006-10-02 02:18:01 -070065};
Greg Banks42a7fc42007-03-06 01:42:23 -080066static DEFINE_MUTEX(svc_pool_map_mutex);/* protects svc_pool_map.count only */
Greg Banksbfd24162006-10-02 02:18:01 -070067
Greg Banks42a7fc42007-03-06 01:42:23 -080068static int
69param_set_pool_mode(const char *val, struct kernel_param *kp)
70{
71 int *ip = (int *)kp->arg;
72 struct svc_pool_map *m = &svc_pool_map;
73 int err;
74
75 mutex_lock(&svc_pool_map_mutex);
76
77 err = -EBUSY;
78 if (m->count)
79 goto out;
80
81 err = 0;
82 if (!strncmp(val, "auto", 4))
83 *ip = SVC_POOL_AUTO;
84 else if (!strncmp(val, "global", 6))
85 *ip = SVC_POOL_GLOBAL;
86 else if (!strncmp(val, "percpu", 6))
87 *ip = SVC_POOL_PERCPU;
88 else if (!strncmp(val, "pernode", 7))
89 *ip = SVC_POOL_PERNODE;
90 else
91 err = -EINVAL;
92
93out:
94 mutex_unlock(&svc_pool_map_mutex);
95 return err;
96}
97
98static int
99param_get_pool_mode(char *buf, struct kernel_param *kp)
100{
101 int *ip = (int *)kp->arg;
102
103 switch (*ip)
104 {
105 case SVC_POOL_AUTO:
106 return strlcpy(buf, "auto", 20);
107 case SVC_POOL_GLOBAL:
108 return strlcpy(buf, "global", 20);
109 case SVC_POOL_PERCPU:
110 return strlcpy(buf, "percpu", 20);
111 case SVC_POOL_PERNODE:
112 return strlcpy(buf, "pernode", 20);
113 default:
114 return sprintf(buf, "%d", *ip);
115 }
116}
117
118module_param_call(pool_mode, param_set_pool_mode, param_get_pool_mode,
119 &svc_pool_map.mode, 0644);
Greg Banksbfd24162006-10-02 02:18:01 -0700120
121/*
122 * Detect best pool mapping mode heuristically,
123 * according to the machine's topology.
124 */
125static int
126svc_pool_map_choose_mode(void)
127{
128 unsigned int node;
129
Christoph Lameter62bc62a2009-06-16 15:32:15 -0700130 if (nr_online_nodes > 1) {
Greg Banksbfd24162006-10-02 02:18:01 -0700131 /*
132 * Actually have multiple NUMA nodes,
133 * so split pools on NUMA node boundaries
134 */
135 return SVC_POOL_PERNODE;
136 }
137
H Hartley Sweeten72c33682010-03-05 13:42:43 -0800138 node = first_online_node;
Greg Banksbfd24162006-10-02 02:18:01 -0700139 if (nr_cpus_node(node) > 2) {
140 /*
141 * Non-trivial SMP, or CONFIG_NUMA on
142 * non-NUMA hardware, e.g. with a generic
143 * x86_64 kernel on Xeons. In this case we
144 * want to divide the pools on cpu boundaries.
145 */
146 return SVC_POOL_PERCPU;
147 }
148
149 /* default: one global pool */
150 return SVC_POOL_GLOBAL;
151}
152
153/*
154 * Allocate the to_pool[] and pool_to[] arrays.
155 * Returns 0 on success or an errno.
156 */
157static int
158svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
159{
160 m->to_pool = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
161 if (!m->to_pool)
162 goto fail;
163 m->pool_to = kcalloc(maxpools, sizeof(unsigned int), GFP_KERNEL);
164 if (!m->pool_to)
165 goto fail_free;
166
167 return 0;
168
169fail_free:
170 kfree(m->to_pool);
J. Bruce Fields61c85042011-12-22 18:22:49 -0700171 m->to_pool = NULL;
Greg Banksbfd24162006-10-02 02:18:01 -0700172fail:
173 return -ENOMEM;
174}
175
176/*
177 * Initialise the pool map for SVC_POOL_PERCPU mode.
178 * Returns number of pools or <0 on error.
179 */
180static int
181svc_pool_map_init_percpu(struct svc_pool_map *m)
182{
Christoph Lameter53b8a312007-02-20 13:57:51 -0800183 unsigned int maxpools = nr_cpu_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700184 unsigned int pidx = 0;
185 unsigned int cpu;
186 int err;
187
188 err = svc_pool_map_alloc_arrays(m, maxpools);
189 if (err)
190 return err;
191
192 for_each_online_cpu(cpu) {
193 BUG_ON(pidx > maxpools);
194 m->to_pool[cpu] = pidx;
195 m->pool_to[pidx] = cpu;
196 pidx++;
197 }
198 /* cpus brought online later all get mapped to pool0, sorry */
199
200 return pidx;
201};
202
203
204/*
205 * Initialise the pool map for SVC_POOL_PERNODE mode.
206 * Returns number of pools or <0 on error.
207 */
208static int
209svc_pool_map_init_pernode(struct svc_pool_map *m)
210{
Christoph Lameter74c7aa82007-02-20 13:57:51 -0800211 unsigned int maxpools = nr_node_ids;
Greg Banksbfd24162006-10-02 02:18:01 -0700212 unsigned int pidx = 0;
213 unsigned int node;
214 int err;
215
216 err = svc_pool_map_alloc_arrays(m, maxpools);
217 if (err)
218 return err;
219
220 for_each_node_with_cpus(node) {
221 /* some architectures (e.g. SN2) have cpuless nodes */
222 BUG_ON(pidx > maxpools);
223 m->to_pool[node] = pidx;
224 m->pool_to[pidx] = node;
225 pidx++;
226 }
227 /* nodes brought online later all get mapped to pool0, sorry */
228
229 return pidx;
230}
231
232
233/*
Greg Banks42a7fc42007-03-06 01:42:23 -0800234 * Add a reference to the global map of cpus to pools (and
235 * vice versa). Initialise the map if we're the first user.
236 * Returns the number of pools.
Greg Banksbfd24162006-10-02 02:18:01 -0700237 */
238static unsigned int
Greg Banks42a7fc42007-03-06 01:42:23 -0800239svc_pool_map_get(void)
Greg Banksbfd24162006-10-02 02:18:01 -0700240{
241 struct svc_pool_map *m = &svc_pool_map;
242 int npools = -1;
243
Greg Banks42a7fc42007-03-06 01:42:23 -0800244 mutex_lock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700245
Greg Banks42a7fc42007-03-06 01:42:23 -0800246 if (m->count++) {
247 mutex_unlock(&svc_pool_map_mutex);
248 return m->npools;
249 }
250
251 if (m->mode == SVC_POOL_AUTO)
252 m->mode = svc_pool_map_choose_mode();
Greg Banksbfd24162006-10-02 02:18:01 -0700253
254 switch (m->mode) {
255 case SVC_POOL_PERCPU:
256 npools = svc_pool_map_init_percpu(m);
257 break;
258 case SVC_POOL_PERNODE:
259 npools = svc_pool_map_init_pernode(m);
260 break;
261 }
262
263 if (npools < 0) {
264 /* default, or memory allocation failure */
265 npools = 1;
266 m->mode = SVC_POOL_GLOBAL;
267 }
268 m->npools = npools;
269
Greg Banks42a7fc42007-03-06 01:42:23 -0800270 mutex_unlock(&svc_pool_map_mutex);
Greg Banksbfd24162006-10-02 02:18:01 -0700271 return m->npools;
272}
273
Greg Banks42a7fc42007-03-06 01:42:23 -0800274
275/*
276 * Drop a reference to the global map of cpus to pools.
277 * When the last reference is dropped, the map data is
278 * freed; this allows the sysadmin to change the pool
279 * mode using the pool_mode module option without
280 * rebooting or re-loading sunrpc.ko.
281 */
282static void
283svc_pool_map_put(void)
284{
285 struct svc_pool_map *m = &svc_pool_map;
286
287 mutex_lock(&svc_pool_map_mutex);
288
289 if (!--m->count) {
Greg Banks42a7fc42007-03-06 01:42:23 -0800290 kfree(m->to_pool);
J. Bruce Fields61c85042011-12-22 18:22:49 -0700291 m->to_pool = NULL;
Greg Banks42a7fc42007-03-06 01:42:23 -0800292 kfree(m->pool_to);
J. Bruce Fields61c85042011-12-22 18:22:49 -0700293 m->pool_to = NULL;
Greg Banks42a7fc42007-03-06 01:42:23 -0800294 m->npools = 0;
295 }
296
297 mutex_unlock(&svc_pool_map_mutex);
298}
299
300
Eric Dumazet11fd1652011-07-28 20:04:09 +0200301static int svc_pool_map_get_node(unsigned int pidx)
302{
303 const struct svc_pool_map *m = &svc_pool_map;
304
305 if (m->count) {
306 if (m->mode == SVC_POOL_PERCPU)
307 return cpu_to_node(m->pool_to[pidx]);
308 if (m->mode == SVC_POOL_PERNODE)
309 return m->pool_to[pidx];
310 }
311 return NUMA_NO_NODE;
312}
Greg Banksbfd24162006-10-02 02:18:01 -0700313/*
Jeff Layton9867d762008-06-10 08:40:38 -0400314 * Set the given thread's cpus_allowed mask so that it
Greg Banksbfd24162006-10-02 02:18:01 -0700315 * will only run on cpus in the given pool.
Greg Banksbfd24162006-10-02 02:18:01 -0700316 */
Jeff Layton9867d762008-06-10 08:40:38 -0400317static inline void
318svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
Greg Banksbfd24162006-10-02 02:18:01 -0700319{
320 struct svc_pool_map *m = &svc_pool_map;
Jeff Layton9867d762008-06-10 08:40:38 -0400321 unsigned int node = m->pool_to[pidx];
Greg Banksbfd24162006-10-02 02:18:01 -0700322
323 /*
324 * The caller checks for sv_nrpools > 1, which
Greg Banks42a7fc42007-03-06 01:42:23 -0800325 * implies that we've been initialized.
Greg Banksbfd24162006-10-02 02:18:01 -0700326 */
Greg Banks42a7fc42007-03-06 01:42:23 -0800327 BUG_ON(m->count == 0);
Greg Banksbfd24162006-10-02 02:18:01 -0700328
Jeff Layton9867d762008-06-10 08:40:38 -0400329 switch (m->mode) {
Greg Banksbfd24162006-10-02 02:18:01 -0700330 case SVC_POOL_PERCPU:
Mike Travisc5f59f02008-04-04 18:11:10 -0700331 {
Rusty Russellaa85ea52009-03-30 22:05:15 -0600332 set_cpus_allowed_ptr(task, cpumask_of(node));
Jeff Layton9867d762008-06-10 08:40:38 -0400333 break;
Mike Travisc5f59f02008-04-04 18:11:10 -0700334 }
Greg Banksbfd24162006-10-02 02:18:01 -0700335 case SVC_POOL_PERNODE:
Mike Travisc5f59f02008-04-04 18:11:10 -0700336 {
Rusty Russella70f7302009-03-13 14:49:46 +1030337 set_cpus_allowed_ptr(task, cpumask_of_node(node));
Jeff Layton9867d762008-06-10 08:40:38 -0400338 break;
Greg Banksbfd24162006-10-02 02:18:01 -0700339 }
Mike Travisc5f59f02008-04-04 18:11:10 -0700340 }
Greg Banksbfd24162006-10-02 02:18:01 -0700341}
342
343/*
344 * Use the mapping mode to choose a pool for a given CPU.
345 * Used when enqueueing an incoming RPC. Always returns
346 * a non-NULL pool pointer.
347 */
348struct svc_pool *
349svc_pool_for_cpu(struct svc_serv *serv, int cpu)
350{
351 struct svc_pool_map *m = &svc_pool_map;
352 unsigned int pidx = 0;
353
354 /*
Greg Banks42a7fc42007-03-06 01:42:23 -0800355 * An uninitialised map happens in a pure client when
Greg Banksbfd24162006-10-02 02:18:01 -0700356 * lockd is brought up, so silently treat it the
357 * same as SVC_POOL_GLOBAL.
358 */
Greg Banks42a7fc42007-03-06 01:42:23 -0800359 if (svc_serv_is_pooled(serv)) {
360 switch (m->mode) {
361 case SVC_POOL_PERCPU:
362 pidx = m->to_pool[cpu];
363 break;
364 case SVC_POOL_PERNODE:
365 pidx = m->to_pool[cpu_to_node(cpu)];
366 break;
367 }
Greg Banksbfd24162006-10-02 02:18:01 -0700368 }
369 return &serv->sv_pools[pidx % serv->sv_nrpools];
370}
371
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400372int svc_rpcb_setup(struct svc_serv *serv, struct net *net)
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300373{
374 int err;
375
Stanislav Kinsburskybee42f682012-01-13 14:02:56 +0400376 err = rpcb_create_local(net);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300377 if (err)
378 return err;
379
380 /* Remove any stale portmap registrations */
Stanislav Kinsburskybee42f682012-01-13 14:02:56 +0400381 svc_unregister(serv, net);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300382 return 0;
383}
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400384EXPORT_SYMBOL_GPL(svc_rpcb_setup);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300385
Stanislav Kinsbursky5ecebb72012-01-13 14:03:04 +0400386void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net)
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300387{
Stanislav Kinsbursky5ecebb72012-01-13 14:03:04 +0400388 svc_unregister(serv, net);
389 rpcb_put_local(net);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300390}
Stanislav Kinsbursky16d05872011-10-25 14:17:28 +0300391EXPORT_SYMBOL_GPL(svc_rpcb_cleanup);
Stanislav Kinsburskyd9908562011-10-25 14:16:58 +0300392
393static int svc_uses_rpcbind(struct svc_serv *serv)
394{
395 struct svc_program *progp;
396 unsigned int i;
397
398 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
399 for (i = 0; i < progp->pg_nvers; i++) {
400 if (progp->pg_vers[i] == NULL)
401 continue;
402 if (progp->pg_vers[i]->vs_hidden == 0)
403 return 1;
404 }
405 }
406
407 return 0;
408}
Greg Banksbfd24162006-10-02 02:18:01 -0700409
Stanislav Kinsbursky9793f7c2012-05-02 16:08:38 +0400410int svc_bind(struct svc_serv *serv, struct net *net)
411{
412 if (!svc_uses_rpcbind(serv))
413 return 0;
414 return svc_rpcb_setup(serv, net);
415}
416EXPORT_SYMBOL_GPL(svc_bind);
417
Greg Banksbfd24162006-10-02 02:18:01 -0700418/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 * Create an RPC service
420 */
Greg Banksa7455442006-10-02 02:17:59 -0700421static struct svc_serv *
422__svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
Stanislav Kinsbursky5ecebb72012-01-13 14:03:04 +0400423 void (*shutdown)(struct svc_serv *serv, struct net *net))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
425 struct svc_serv *serv;
Chuck Leverea339d42007-10-26 13:32:56 -0400426 unsigned int vers;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 unsigned int xdrsize;
Greg Banks3262c812006-10-02 02:17:58 -0700428 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700430 if (!(serv = kzalloc(sizeof(*serv), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 return NULL;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000432 serv->sv_name = prog->pg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 serv->sv_program = prog;
434 serv->sv_nrthreads = 1;
435 serv->sv_stats = prog->pg_stats;
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700436 if (bufsize > RPCSVC_MAXPAYLOAD)
437 bufsize = RPCSVC_MAXPAYLOAD;
438 serv->sv_max_payload = bufsize? bufsize : 4096;
439 serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
NeilBrownbc591cc2006-10-02 02:17:44 -0700440 serv->sv_shutdown = shutdown;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 xdrsize = 0;
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +0000442 while (prog) {
443 prog->pg_lovers = prog->pg_nvers-1;
444 for (vers=0; vers<prog->pg_nvers ; vers++)
445 if (prog->pg_vers[vers]) {
446 prog->pg_hivers = vers;
447 if (prog->pg_lovers > vers)
448 prog->pg_lovers = vers;
449 if (prog->pg_vers[vers]->vs_xdrsize > xdrsize)
450 xdrsize = prog->pg_vers[vers]->vs_xdrsize;
451 }
452 prog = prog->pg_next;
453 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 serv->sv_xdrsize = xdrsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 INIT_LIST_HEAD(&serv->sv_tempsocks);
456 INIT_LIST_HEAD(&serv->sv_permsocks);
Greg Banks36bdfc82006-10-02 02:17:54 -0700457 init_timer(&serv->sv_temptimer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 spin_lock_init(&serv->sv_lock);
459
Greg Banksa7455442006-10-02 02:17:59 -0700460 serv->sv_nrpools = npools;
Greg Banks3262c812006-10-02 02:17:58 -0700461 serv->sv_pools =
Robert P. J. Daycd861282006-12-13 00:34:52 -0800462 kcalloc(serv->sv_nrpools, sizeof(struct svc_pool),
Greg Banks3262c812006-10-02 02:17:58 -0700463 GFP_KERNEL);
464 if (!serv->sv_pools) {
465 kfree(serv);
466 return NULL;
467 }
468
469 for (i = 0; i < serv->sv_nrpools; i++) {
470 struct svc_pool *pool = &serv->sv_pools[i];
471
Chuck Lever46121cf2007-01-31 12:14:08 -0500472 dprintk("svc: initialising pool %u for %s\n",
Greg Banks3262c812006-10-02 02:17:58 -0700473 i, serv->sv_name);
474
475 pool->sp_id = i;
476 INIT_LIST_HEAD(&pool->sp_threads);
477 INIT_LIST_HEAD(&pool->sp_sockets);
Greg Banksa7455442006-10-02 02:17:59 -0700478 INIT_LIST_HEAD(&pool->sp_all_threads);
Greg Banks3262c812006-10-02 02:17:58 -0700479 spin_lock_init(&pool->sp_lock);
480 }
481
Stanislav Kinsbursky9793f7c2012-05-02 16:08:38 +0400482 if (svc_uses_rpcbind(serv) && (!serv->sv_shutdown))
483 serv->sv_shutdown = svc_rpcb_cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485 return serv;
486}
487
Greg Banksa7455442006-10-02 02:17:59 -0700488struct svc_serv *
489svc_create(struct svc_program *prog, unsigned int bufsize,
Stanislav Kinsbursky5ecebb72012-01-13 14:03:04 +0400490 void (*shutdown)(struct svc_serv *serv, struct net *net))
Greg Banksa7455442006-10-02 02:17:59 -0700491{
Chuck Lever49a90722009-03-18 20:46:29 -0400492 return __svc_create(prog, bufsize, /*npools*/1, shutdown);
Greg Banksa7455442006-10-02 02:17:59 -0700493}
Trond Myklebust24c37672008-12-23 16:30:12 -0500494EXPORT_SYMBOL_GPL(svc_create);
Greg Banksa7455442006-10-02 02:17:59 -0700495
496struct svc_serv *
497svc_create_pooled(struct svc_program *prog, unsigned int bufsize,
Stanislav Kinsbursky5ecebb72012-01-13 14:03:04 +0400498 void (*shutdown)(struct svc_serv *serv, struct net *net),
Jeff Laytona75c5d02008-06-10 08:40:39 -0400499 svc_thread_fn func, struct module *mod)
Greg Banksa7455442006-10-02 02:17:59 -0700500{
501 struct svc_serv *serv;
Greg Banks42a7fc42007-03-06 01:42:23 -0800502 unsigned int npools = svc_pool_map_get();
Greg Banksa7455442006-10-02 02:17:59 -0700503
Chuck Lever49a90722009-03-18 20:46:29 -0400504 serv = __svc_create(prog, bufsize, npools, shutdown);
Greg Banksa7455442006-10-02 02:17:59 -0700505
506 if (serv != NULL) {
507 serv->sv_function = func;
Greg Banksa7455442006-10-02 02:17:59 -0700508 serv->sv_module = mod;
509 }
510
511 return serv;
512}
Trond Myklebust24c37672008-12-23 16:30:12 -0500513EXPORT_SYMBOL_GPL(svc_create_pooled);
Greg Banksa7455442006-10-02 02:17:59 -0700514
Stanislav Kinsbursky074d0f62012-01-31 14:09:25 +0400515void svc_shutdown_net(struct svc_serv *serv, struct net *net)
516{
517 /*
518 * The set of xprts (contained in the sv_tempsocks and
519 * sv_permsocks lists) is now constant, since it is modified
520 * only by accepting new sockets (done by service threads in
521 * svc_recv) or aging old ones (done by sv_temptimer), or
522 * configuration changes (excluded by whatever locking the
523 * caller is using--nfsd_mutex in the case of nfsd). So it's
524 * safe to traverse those lists and shut everything down:
525 */
526 svc_close_net(serv, net);
527
528 if (serv->sv_shutdown)
529 serv->sv_shutdown(serv, net);
530}
531EXPORT_SYMBOL_GPL(svc_shutdown_net);
532
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533/*
Neil Brownbedbdd82008-06-10 08:40:35 -0400534 * Destroy an RPC service. Should be called with appropriate locking to
535 * protect the sv_nrthreads, sv_permsocks and sv_tempsocks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 */
537void
538svc_destroy(struct svc_serv *serv)
539{
Chuck Lever46121cf2007-01-31 12:14:08 -0500540 dprintk("svc: svc_destroy(%s, %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 serv->sv_program->pg_name,
542 serv->sv_nrthreads);
543
544 if (serv->sv_nrthreads) {
545 if (--(serv->sv_nrthreads) != 0) {
546 svc_sock_update_bufs(serv);
547 return;
548 }
549 } else
550 printk("svc_destroy: no threads for serv=%p!\n", serv);
551
Greg Banks36bdfc82006-10-02 02:17:54 -0700552 del_timer_sync(&serv->sv_temptimer);
Stanislav Kinsbursky074d0f62012-01-31 14:09:25 +0400553
Stanislav Kinsbursky7b147f12012-01-31 14:09:17 +0400554 /*
555 * The last user is gone and thus all sockets have to be destroyed to
556 * the point. Check this.
557 */
558 BUG_ON(!list_empty(&serv->sv_permsocks));
559 BUG_ON(!list_empty(&serv->sv_tempsocks));
NeilBrowncda1fd42007-03-06 01:42:22 -0800560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 cache_clean_deferred(serv);
562
Greg Banks42a7fc42007-03-06 01:42:23 -0800563 if (svc_serv_is_pooled(serv))
564 svc_pool_map_put();
565
Greg Banks3262c812006-10-02 02:17:58 -0700566 kfree(serv->sv_pools);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 kfree(serv);
568}
Trond Myklebust24c37672008-12-23 16:30:12 -0500569EXPORT_SYMBOL_GPL(svc_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
571/*
572 * Allocate an RPC server's buffer space.
573 * We allocate pages and place them in rq_argpages.
574 */
575static int
Eric Dumazet11fd1652011-07-28 20:04:09 +0200576svc_init_buffer(struct svc_rqst *rqstp, unsigned int size, int node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577{
Chuck Lever0dc220f2008-04-14 12:27:52 -0400578 unsigned int pages, arghi;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800579
Andy Adamsonba176862010-01-26 21:24:04 -0500580 /* bc_xprt uses fore channel allocated buffers */
581 if (svc_is_backchannel(rqstp))
582 return 1;
583
NeilBrownc6b0a9f2006-10-06 00:44:05 -0700584 pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
585 * We assume one is at most one page
586 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 arghi = 0;
Kris Katterjohn09a62662006-01-08 22:24:28 -0800588 BUG_ON(pages > RPCSVC_MAXPAGES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 while (pages) {
Eric Dumazet11fd1652011-07-28 20:04:09 +0200590 struct page *p = alloc_pages_node(node, GFP_KERNEL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 if (!p)
592 break;
NeilBrown44524352006-10-04 02:15:46 -0700593 rqstp->rq_pages[arghi++] = p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 pages--;
595 }
Chuck Lever0dc220f2008-04-14 12:27:52 -0400596 return pages == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597}
598
599/*
600 * Release an RPC server buffer
601 */
602static void
603svc_release_buffer(struct svc_rqst *rqstp)
604{
Chuck Lever50c8bb12008-04-14 12:27:45 -0400605 unsigned int i;
606
607 for (i = 0; i < ARRAY_SIZE(rqstp->rq_pages); i++)
NeilBrown44524352006-10-04 02:15:46 -0700608 if (rqstp->rq_pages[i])
609 put_page(rqstp->rq_pages[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610}
611
Jeff Layton0113ab32008-01-29 10:30:54 -0500612struct svc_rqst *
Eric Dumazet11fd1652011-07-28 20:04:09 +0200613svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
Jeff Layton0113ab32008-01-29 10:30:54 -0500614{
615 struct svc_rqst *rqstp;
616
Eric Dumazet11fd1652011-07-28 20:04:09 +0200617 rqstp = kzalloc_node(sizeof(*rqstp), GFP_KERNEL, node);
Jeff Layton0113ab32008-01-29 10:30:54 -0500618 if (!rqstp)
619 goto out_enomem;
620
621 init_waitqueue_head(&rqstp->rq_wait);
622
623 serv->sv_nrthreads++;
624 spin_lock_bh(&pool->sp_lock);
625 pool->sp_nrthreads++;
626 list_add(&rqstp->rq_all, &pool->sp_all_threads);
627 spin_unlock_bh(&pool->sp_lock);
628 rqstp->rq_server = serv;
629 rqstp->rq_pool = pool;
630
Eric Dumazet11fd1652011-07-28 20:04:09 +0200631 rqstp->rq_argp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
Jeff Layton0113ab32008-01-29 10:30:54 -0500632 if (!rqstp->rq_argp)
633 goto out_thread;
634
Eric Dumazet11fd1652011-07-28 20:04:09 +0200635 rqstp->rq_resp = kmalloc_node(serv->sv_xdrsize, GFP_KERNEL, node);
Jeff Layton0113ab32008-01-29 10:30:54 -0500636 if (!rqstp->rq_resp)
637 goto out_thread;
638
Eric Dumazet11fd1652011-07-28 20:04:09 +0200639 if (!svc_init_buffer(rqstp, serv->sv_max_mesg, node))
Jeff Layton0113ab32008-01-29 10:30:54 -0500640 goto out_thread;
641
642 return rqstp;
643out_thread:
644 svc_exit_thread(rqstp);
645out_enomem:
646 return ERR_PTR(-ENOMEM);
647}
Trond Myklebust24c37672008-12-23 16:30:12 -0500648EXPORT_SYMBOL_GPL(svc_prepare_thread);
Jeff Layton0113ab32008-01-29 10:30:54 -0500649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650/*
Greg Banksa7455442006-10-02 02:17:59 -0700651 * Choose a pool in which to create a new thread, for svc_set_num_threads
652 */
653static inline struct svc_pool *
654choose_pool(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
655{
656 if (pool != NULL)
657 return pool;
658
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800659 return &serv->sv_pools[(*state)++ % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700660}
661
662/*
663 * Choose a thread to kill, for svc_set_num_threads
664 */
665static inline struct task_struct *
666choose_victim(struct svc_serv *serv, struct svc_pool *pool, unsigned int *state)
667{
668 unsigned int i;
669 struct task_struct *task = NULL;
670
671 if (pool != NULL) {
672 spin_lock_bh(&pool->sp_lock);
673 } else {
674 /* choose a pool in round-robin fashion */
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800675 for (i = 0; i < serv->sv_nrpools; i++) {
676 pool = &serv->sv_pools[--(*state) % serv->sv_nrpools];
Greg Banksa7455442006-10-02 02:17:59 -0700677 spin_lock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800678 if (!list_empty(&pool->sp_all_threads))
679 goto found_pool;
Greg Banksa7455442006-10-02 02:17:59 -0700680 spin_unlock_bh(&pool->sp_lock);
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800681 }
Greg Banksa7455442006-10-02 02:17:59 -0700682 return NULL;
683 }
684
685found_pool:
686 if (!list_empty(&pool->sp_all_threads)) {
687 struct svc_rqst *rqstp;
688
689 /*
690 * Remove from the pool->sp_all_threads list
691 * so we don't try to kill it again.
692 */
693 rqstp = list_entry(pool->sp_all_threads.next, struct svc_rqst, rq_all);
694 list_del_init(&rqstp->rq_all);
695 task = rqstp->rq_task;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800696 }
Greg Banksa7455442006-10-02 02:17:59 -0700697 spin_unlock_bh(&pool->sp_lock);
698
699 return task;
700}
701
702/*
703 * Create or destroy enough new threads to make the number
704 * of threads the given number. If `pool' is non-NULL, applies
705 * only to threads in that pool, otherwise round-robins between
J. Bruce Fields94cf3172011-12-01 17:51:21 -0500706 * all pools. Caller must ensure that mutual exclusion between this and
707 * server startup or shutdown.
Greg Banksa7455442006-10-02 02:17:59 -0700708 *
709 * Destroying threads relies on the service threads filling in
710 * rqstp->rq_task, which only the nfs ones do. Assumes the serv
711 * has been created using svc_create_pooled().
712 *
713 * Based on code that used to be in nfsd_svc() but tweaked
714 * to be pool-aware.
715 */
716int
717svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
718{
Jeff Layton9867d762008-06-10 08:40:38 -0400719 struct svc_rqst *rqstp;
720 struct task_struct *task;
721 struct svc_pool *chosen_pool;
Greg Banksa7455442006-10-02 02:17:59 -0700722 int error = 0;
723 unsigned int state = serv->sv_nrthreads-1;
Eric Dumazet11fd1652011-07-28 20:04:09 +0200724 int node;
Greg Banksa7455442006-10-02 02:17:59 -0700725
726 if (pool == NULL) {
727 /* The -1 assumes caller has done a svc_get() */
728 nrservs -= (serv->sv_nrthreads-1);
729 } else {
730 spin_lock_bh(&pool->sp_lock);
731 nrservs -= pool->sp_nrthreads;
732 spin_unlock_bh(&pool->sp_lock);
733 }
734
735 /* create new threads */
736 while (nrservs > 0) {
737 nrservs--;
Jeff Layton9867d762008-06-10 08:40:38 -0400738 chosen_pool = choose_pool(serv, pool, &state);
739
Eric Dumazet11fd1652011-07-28 20:04:09 +0200740 node = svc_pool_map_get_node(chosen_pool->sp_id);
741 rqstp = svc_prepare_thread(serv, chosen_pool, node);
Jeff Layton9867d762008-06-10 08:40:38 -0400742 if (IS_ERR(rqstp)) {
743 error = PTR_ERR(rqstp);
Greg Banksa7455442006-10-02 02:17:59 -0700744 break;
745 }
Jeff Layton9867d762008-06-10 08:40:38 -0400746
747 __module_get(serv->sv_module);
Eric Dumazet11fd1652011-07-28 20:04:09 +0200748 task = kthread_create_on_node(serv->sv_function, rqstp,
749 node, serv->sv_name);
Jeff Layton9867d762008-06-10 08:40:38 -0400750 if (IS_ERR(task)) {
751 error = PTR_ERR(task);
752 module_put(serv->sv_module);
753 svc_exit_thread(rqstp);
754 break;
755 }
756
757 rqstp->rq_task = task;
758 if (serv->sv_nrpools > 1)
759 svc_pool_map_set_cpumask(task, chosen_pool->sp_id);
760
761 svc_sock_update_bufs(serv);
762 wake_up_process(task);
Greg Banksa7455442006-10-02 02:17:59 -0700763 }
764 /* destroy old threads */
765 while (nrservs < 0 &&
Jeff Layton9867d762008-06-10 08:40:38 -0400766 (task = choose_victim(serv, pool, &state)) != NULL) {
Jeff Laytona75c5d02008-06-10 08:40:39 -0400767 send_sig(SIGINT, task, 1);
Greg Banksa7455442006-10-02 02:17:59 -0700768 nrservs++;
769 }
770
771 return error;
772}
Trond Myklebust24c37672008-12-23 16:30:12 -0500773EXPORT_SYMBOL_GPL(svc_set_num_threads);
Greg Banksa7455442006-10-02 02:17:59 -0700774
775/*
Neil Brownbedbdd82008-06-10 08:40:35 -0400776 * Called from a server thread as it's exiting. Caller must hold the BKL or
777 * the "service mutex", whichever is appropriate for the service.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 */
779void
780svc_exit_thread(struct svc_rqst *rqstp)
781{
782 struct svc_serv *serv = rqstp->rq_server;
Greg Banks3262c812006-10-02 02:17:58 -0700783 struct svc_pool *pool = rqstp->rq_pool;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785 svc_release_buffer(rqstp);
Jesper Juhla51482b2005-11-08 09:41:34 -0800786 kfree(rqstp->rq_resp);
787 kfree(rqstp->rq_argp);
788 kfree(rqstp->rq_auth_data);
Greg Banks3262c812006-10-02 02:17:58 -0700789
790 spin_lock_bh(&pool->sp_lock);
791 pool->sp_nrthreads--;
Greg Banksa7455442006-10-02 02:17:59 -0700792 list_del(&rqstp->rq_all);
Greg Banks3262c812006-10-02 02:17:58 -0700793 spin_unlock_bh(&pool->sp_lock);
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 kfree(rqstp);
796
797 /* Release the server */
798 if (serv)
799 svc_destroy(serv);
800}
Trond Myklebust24c37672008-12-23 16:30:12 -0500801EXPORT_SYMBOL_GPL(svc_exit_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
803/*
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500804 * Register an "inet" protocol family netid with the local
805 * rpcbind daemon via an rpcbind v4 SET request.
Chuck Levera26cfad2008-08-18 19:34:16 -0400806 *
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500807 * No netconfig infrastructure is available in the kernel, so
808 * we map IP_ protocol numbers to netids by hand.
Chuck Levera26cfad2008-08-18 19:34:16 -0400809 *
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500810 * Returns zero on success; a negative errno value is returned
811 * if any error occurs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400813static int __svc_rpcb_register4(struct net *net, const u32 program,
814 const u32 version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500815 const unsigned short protocol,
816 const unsigned short port)
Chuck Levera26cfad2008-08-18 19:34:16 -0400817{
Chuck Levercadc0fa2009-03-18 20:47:36 -0400818 const struct sockaddr_in sin = {
Chuck Levera26cfad2008-08-18 19:34:16 -0400819 .sin_family = AF_INET,
820 .sin_addr.s_addr = htonl(INADDR_ANY),
821 .sin_port = htons(port),
822 };
Chuck Levercadc0fa2009-03-18 20:47:36 -0400823 const char *netid;
824 int error;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500825
826 switch (protocol) {
827 case IPPROTO_UDP:
828 netid = RPCBIND_NETID_UDP;
829 break;
830 case IPPROTO_TCP:
831 netid = RPCBIND_NETID_TCP;
832 break;
833 default:
Chuck Leverba5c35e2009-03-18 20:46:59 -0400834 return -ENOPROTOOPT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500835 }
836
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400837 error = rpcb_v4_register(net, program, version,
Chuck Levercadc0fa2009-03-18 20:47:36 -0400838 (const struct sockaddr *)&sin, netid);
839
840 /*
841 * User space didn't support rpcbind v4, so retry this
842 * registration request with the legacy rpcbind v2 protocol.
843 */
844 if (error == -EPROTONOSUPPORT)
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400845 error = rpcb_register(net, program, version, protocol, port);
Chuck Levercadc0fa2009-03-18 20:47:36 -0400846
847 return error;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500848}
849
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000850#if IS_ENABLED(CONFIG_IPV6)
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500851/*
852 * Register an "inet6" protocol family netid with the local
853 * rpcbind daemon via an rpcbind v4 SET request.
854 *
855 * No netconfig infrastructure is available in the kernel, so
856 * we map IP_ protocol numbers to netids by hand.
857 *
858 * Returns zero on success; a negative errno value is returned
859 * if any error occurs.
860 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400861static int __svc_rpcb_register6(struct net *net, const u32 program,
862 const u32 version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500863 const unsigned short protocol,
864 const unsigned short port)
865{
Chuck Levercadc0fa2009-03-18 20:47:36 -0400866 const struct sockaddr_in6 sin6 = {
Chuck Levera26cfad2008-08-18 19:34:16 -0400867 .sin6_family = AF_INET6,
868 .sin6_addr = IN6ADDR_ANY_INIT,
869 .sin6_port = htons(port),
870 };
Chuck Levercadc0fa2009-03-18 20:47:36 -0400871 const char *netid;
872 int error;
Chuck Levera26cfad2008-08-18 19:34:16 -0400873
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500874 switch (protocol) {
875 case IPPROTO_UDP:
876 netid = RPCBIND_NETID_UDP6;
877 break;
878 case IPPROTO_TCP:
879 netid = RPCBIND_NETID_TCP6;
880 break;
881 default:
Chuck Leverba5c35e2009-03-18 20:46:59 -0400882 return -ENOPROTOOPT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500883 }
884
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400885 error = rpcb_v4_register(net, program, version,
Chuck Levercadc0fa2009-03-18 20:47:36 -0400886 (const struct sockaddr *)&sin6, netid);
887
888 /*
889 * User space didn't support rpcbind version 4, so we won't
890 * use a PF_INET6 listener.
891 */
892 if (error == -EPROTONOSUPPORT)
893 error = -EAFNOSUPPORT;
894
895 return error;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500896}
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000897#endif /* IS_ENABLED(CONFIG_IPV6) */
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500898
899/*
900 * Register a kernel RPC service via rpcbind version 4.
901 *
902 * Returns zero on success; a negative errno value is returned
903 * if any error occurs.
904 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400905static int __svc_register(struct net *net, const char *progname,
Chuck Lever363f7242009-03-18 20:47:44 -0400906 const u32 program, const u32 version,
Chuck Lever4b62e582009-03-18 20:46:06 -0400907 const int family,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500908 const unsigned short protocol,
909 const unsigned short port)
910{
Chuck Lever363f7242009-03-18 20:47:44 -0400911 int error = -EAFNOSUPPORT;
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500912
Chuck Levera26cfad2008-08-18 19:34:16 -0400913 switch (family) {
Chuck Lever4b62e582009-03-18 20:46:06 -0400914 case PF_INET:
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400915 error = __svc_rpcb_register4(net, program, version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500916 protocol, port);
Chuck Levercadc0fa2009-03-18 20:47:36 -0400917 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000918#if IS_ENABLED(CONFIG_IPV6)
Chuck Lever4b62e582009-03-18 20:46:06 -0400919 case PF_INET6:
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400920 error = __svc_rpcb_register6(net, program, version,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500921 protocol, port);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000922#endif
Chuck Levera26cfad2008-08-18 19:34:16 -0400923 }
924
Chuck Lever363f7242009-03-18 20:47:44 -0400925 if (error < 0)
926 printk(KERN_WARNING "svc: failed to register %sv%u RPC "
927 "service (errno %d).\n", progname, version, -error);
928 return error;
Chuck Levera26cfad2008-08-18 19:34:16 -0400929}
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500930
Chuck Levera26cfad2008-08-18 19:34:16 -0400931/**
932 * svc_register - register an RPC service with the local portmapper
933 * @serv: svc_serv struct for the service to register
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400934 * @net: net namespace for the service to register
Chuck Lever4b62e582009-03-18 20:46:06 -0400935 * @family: protocol family of service's listener socket
Chuck Levera26cfad2008-08-18 19:34:16 -0400936 * @proto: transport protocol number to advertise
937 * @port: port to advertise
938 *
Chuck Lever4b62e582009-03-18 20:46:06 -0400939 * Service is registered for any address in the passed-in protocol family
Chuck Levera26cfad2008-08-18 19:34:16 -0400940 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400941int svc_register(const struct svc_serv *serv, struct net *net,
942 const int family, const unsigned short proto,
943 const unsigned short port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944{
945 struct svc_program *progp;
Chuck Leverea339d42007-10-26 13:32:56 -0400946 unsigned int i;
Chuck Lever14aeb212008-08-18 19:34:00 -0400947 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
Chuck Lever7252d572008-08-18 19:34:08 -0400949 BUG_ON(proto == 0 && port == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700951 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
952 for (i = 0; i < progp->pg_nvers; i++) {
953 if (progp->pg_vers[i] == NULL)
954 continue;
955
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500956 dprintk("svc: svc_register(%sv%d, %s, %u, %u)%s\n",
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700957 progp->pg_name,
Chuck Lever2c7eb0b2008-09-15 16:27:23 -0500958 i,
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700959 proto == IPPROTO_UDP? "udp" : "tcp",
960 port,
Chuck Lever4b62e582009-03-18 20:46:06 -0400961 family,
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700962 progp->pg_vers[i]->vs_hidden?
963 " (but not telling portmap)" : "");
964
965 if (progp->pg_vers[i]->vs_hidden)
966 continue;
967
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400968 error = __svc_register(net, progp->pg_name, progp->pg_prog,
Chuck Lever363f7242009-03-18 20:47:44 -0400969 i, family, proto, port);
Olaf Kirchbc5fea42006-10-04 02:16:05 -0700970 if (error < 0)
971 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 }
973 }
974
Chuck Lever7252d572008-08-18 19:34:08 -0400975 return error;
976}
977
Chuck Leverd5a86202009-03-18 20:47:29 -0400978/*
979 * If user space is running rpcbind, it should take the v4 UNSET
980 * and clear everything for this [program, version]. If user space
981 * is running portmap, it will reject the v4 UNSET, but won't have
982 * any "inet6" entries anyway. So a PMAP_UNSET should be sufficient
983 * in this case to clear all existing entries for [program, version].
984 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400985static void __svc_unregister(struct net *net, const u32 program, const u32 version,
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400986 const char *progname)
987{
988 int error;
989
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400990 error = rpcb_v4_register(net, program, version, NULL, "");
Chuck Leverd5a86202009-03-18 20:47:29 -0400991
992 /*
993 * User space didn't support rpcbind v4, so retry this
994 * request with the legacy rpcbind v2 protocol.
995 */
996 if (error == -EPROTONOSUPPORT)
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +0400997 error = rpcb_register(net, program, version, 0, 0);
Chuck Leverd5a86202009-03-18 20:47:29 -0400998
Chuck Leverf6fb3f62008-09-25 11:56:57 -0400999 dprintk("svc: %s(%sv%u), error %d\n",
1000 __func__, progname, version, error);
1001}
1002
Chuck Lever7252d572008-08-18 19:34:08 -04001003/*
Chuck Leverf6fb3f62008-09-25 11:56:57 -04001004 * All netids, bind addresses and ports registered for [program, version]
1005 * are removed from the local rpcbind database (if the service is not
1006 * hidden) to make way for a new instance of the service.
Chuck Lever7252d572008-08-18 19:34:08 -04001007 *
Chuck Leverf6fb3f62008-09-25 11:56:57 -04001008 * The result of unregistration is reported via dprintk for those who want
1009 * verification of the result, but is otherwise not important.
Chuck Lever7252d572008-08-18 19:34:08 -04001010 */
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +04001011static void svc_unregister(const struct svc_serv *serv, struct net *net)
Chuck Lever7252d572008-08-18 19:34:08 -04001012{
1013 struct svc_program *progp;
1014 unsigned long flags;
1015 unsigned int i;
Chuck Lever7252d572008-08-18 19:34:08 -04001016
1017 clear_thread_flag(TIF_SIGPENDING);
1018
1019 for (progp = serv->sv_program; progp; progp = progp->pg_next) {
1020 for (i = 0; i < progp->pg_nvers; i++) {
1021 if (progp->pg_vers[i] == NULL)
1022 continue;
1023 if (progp->pg_vers[i]->vs_hidden)
1024 continue;
1025
Chuck Lever7402ab192011-05-09 15:22:55 -04001026 dprintk("svc: attempting to unregister %sv%u\n",
1027 progp->pg_name, i);
Stanislav Kinsbursky5247fab2012-01-13 14:02:48 +04001028 __svc_unregister(net, progp->pg_prog, i, progp->pg_name);
Chuck Lever7252d572008-08-18 19:34:08 -04001029 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 }
1031
Chuck Lever7252d572008-08-18 19:34:08 -04001032 spin_lock_irqsave(&current->sighand->siglock, flags);
1033 recalc_sigpending();
1034 spin_unlock_irqrestore(&current->sighand->siglock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035}
1036
1037/*
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001038 * Printk the given error with the address of the client that caused it.
1039 */
Joe Perchesb9075fa2011-10-31 17:11:33 -07001040static __printf(2, 3)
Joe Perchese87cc472012-05-13 21:56:26 +00001041void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001042{
Joe Perchese87cc472012-05-13 21:56:26 +00001043 struct va_format vaf;
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001044 va_list args;
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001045 char buf[RPC_MAX_ADDRBUFLEN];
1046
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001047 va_start(args, fmt);
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001048
Joe Perchese87cc472012-05-13 21:56:26 +00001049 vaf.fmt = fmt;
1050 vaf.va = &args;
1051
1052 net_warn_ratelimited("svc: %s: %pV",
1053 svc_print_addr(rqstp, buf, sizeof(buf)), &vaf);
1054
1055 va_end(args);
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001056}
1057
1058/*
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001059 * Common routine for processing the RPC request.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 */
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001061static int
1062svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063{
1064 struct svc_program *progp;
1065 struct svc_version *versp = NULL; /* compiler food */
1066 struct svc_procedure *procp = NULL;
NeilBrown6fb2b472006-10-02 02:17:50 -07001067 struct svc_serv *serv = rqstp->rq_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 kxdrproc_t xdr;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001069 __be32 *statp;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001070 u32 prog, vers, proc;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -07001071 __be32 auth_stat, rpc_stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 int auth_res;
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001073 __be32 *reply_statp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074
1075 rpc_stat = rpc_success;
1076
1077 if (argv->iov_len < 6*4)
1078 goto err_short_len;
1079
J. Bruce Fields5c04c462006-06-30 01:56:19 -07001080 /* Will be turned off only in gss privacy case: */
Jens Axboecf8208d2007-06-12 21:22:14 +02001081 rqstp->rq_splice_ok = 1;
Andy Adamson2f425872009-04-03 08:27:32 +03001082 /* Will be turned off only when NFSv4 Sessions are used */
1083 rqstp->rq_usedeferral = 1;
J. Bruce Fields9e701c62011-01-02 21:56:36 -05001084 rqstp->rq_dropme = false;
Tom Tuckere831fe62007-12-30 21:07:29 -06001085
1086 /* Setup reply header */
1087 rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 svc_putu32(resv, rqstp->rq_xid);
1090
Alexey Dobriyan76994312006-09-26 22:28:46 -07001091 vers = svc_getnl(argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
1093 /* First words of reply: */
Alexey Dobriyan76994312006-09-26 22:28:46 -07001094 svc_putnl(resv, 1); /* REPLY */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 if (vers != 2) /* RPC version number */
1097 goto err_bad_rpc;
1098
1099 /* Save position in case we later decide to reject: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001100 reply_statp = resv->iov_base + resv->iov_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
Alexey Dobriyan76994312006-09-26 22:28:46 -07001102 svc_putnl(resv, 0); /* ACCEPT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
Alexey Dobriyan76994312006-09-26 22:28:46 -07001104 rqstp->rq_prog = prog = svc_getnl(argv); /* program number */
1105 rqstp->rq_vers = vers = svc_getnl(argv); /* version number */
1106 rqstp->rq_proc = proc = svc_getnl(argv); /* procedure number */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107
1108 progp = serv->sv_program;
NeilBrown80d188a2005-11-07 01:00:27 -08001109
1110 for (progp = serv->sv_program; progp; progp = progp->pg_next)
1111 if (prog == progp->pg_prog)
1112 break;
1113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 /*
1115 * Decode auth data, and add verifier to reply buffer.
1116 * We do this before anything else in order to get a decent
1117 * auth verifier.
1118 */
1119 auth_res = svc_authenticate(rqstp, &auth_stat);
1120 /* Also give the program a chance to reject this call: */
NeilBrown80d188a2005-11-07 01:00:27 -08001121 if (auth_res == SVC_OK && progp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 auth_stat = rpc_autherr_badcred;
1123 auth_res = progp->pg_authenticate(rqstp);
1124 }
1125 switch (auth_res) {
1126 case SVC_OK:
1127 break;
1128 case SVC_GARBAGE:
Harshula Jayasuriyadd352102008-02-20 10:56:56 +11001129 goto err_garbage;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 case SVC_SYSERR:
1131 rpc_stat = rpc_system_err;
1132 goto err_bad;
1133 case SVC_DENIED:
1134 goto err_bad_auth;
NeilBrown1ebede82010-08-12 17:04:07 +10001135 case SVC_CLOSE:
1136 if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags))
1137 svc_close_xprt(rqstp->rq_xprt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 case SVC_DROP:
1139 goto dropit;
1140 case SVC_COMPLETE:
1141 goto sendit;
1142 }
NeilBrown80d188a2005-11-07 01:00:27 -08001143
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +00001144 if (progp == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 goto err_bad_prog;
1146
1147 if (vers >= progp->pg_nvers ||
1148 !(versp = progp->pg_vers[vers]))
1149 goto err_bad_vers;
1150
1151 procp = versp->vs_proc + proc;
1152 if (proc >= versp->vs_nproc || !procp->pc_func)
1153 goto err_bad_proc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 rqstp->rq_procinfo = procp;
1155
1156 /* Syntactic check complete */
1157 serv->sv_stats->rpccnt++;
1158
1159 /* Build the reply header. */
1160 statp = resv->iov_base +resv->iov_len;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001161 svc_putnl(resv, RPC_SUCCESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163 /* Bump per-procedure stats counter */
1164 procp->pc_count++;
1165
1166 /* Initialize storage for argp and resp */
1167 memset(rqstp->rq_argp, 0, procp->pc_argsize);
1168 memset(rqstp->rq_resp, 0, procp->pc_ressize);
1169
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -08001170 /* un-reserve some of the out-queue now that we have a
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 * better idea of reply size
1172 */
1173 if (procp->pc_xdrressize)
Jeff Laytoncd123012007-05-09 02:34:50 -07001174 svc_reserve_auth(rqstp, procp->pc_xdrressize<<2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
1176 /* Call the function that processes the request. */
1177 if (!versp->vs_dispatch) {
1178 /* Decode arguments */
1179 xdr = procp->pc_decode;
1180 if (xdr && !xdr(rqstp, argv->iov_base, rqstp->rq_argp))
1181 goto err_garbage;
1182
1183 *statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
1184
1185 /* Encode reply */
J. Bruce Fields9e701c62011-01-02 21:56:36 -05001186 if (rqstp->rq_dropme) {
NeilBrownd343fce2006-10-17 00:10:18 -07001187 if (procp->pc_release)
1188 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1189 goto dropit;
1190 }
Joe Perchesf64f9e72009-11-29 16:55:45 -08001191 if (*statp == rpc_success &&
1192 (xdr = procp->pc_encode) &&
1193 !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 dprintk("svc: failed to encode reply\n");
1195 /* serv->sv_stats->rpcsystemerr++; */
1196 *statp = rpc_system_err;
1197 }
1198 } else {
1199 dprintk("svc: calling dispatcher\n");
1200 if (!versp->vs_dispatch(rqstp, statp)) {
1201 /* Release reply info */
1202 if (procp->pc_release)
1203 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1204 goto dropit;
1205 }
1206 }
1207
1208 /* Check RPC status result */
1209 if (*statp != rpc_success)
1210 resv->iov_len = ((void*)statp) - resv->iov_base + 4;
1211
1212 /* Release reply info */
1213 if (procp->pc_release)
1214 procp->pc_release(rqstp, NULL, rqstp->rq_resp);
1215
1216 if (procp->pc_encode == NULL)
1217 goto dropit;
1218
1219 sendit:
1220 if (svc_authorise(rqstp))
1221 goto dropit;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001222 return 1; /* Caller can now send it */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223
1224 dropit:
1225 svc_authorise(rqstp); /* doesn't hurt to call this twice */
1226 dprintk("svc: svc_process dropit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 return 0;
1228
1229err_short_len:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001230 svc_printk(rqstp, "short len %Zd, dropping request\n",
1231 argv->iov_len);
NeilBrown34e9a632007-01-29 13:19:52 -08001232
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 goto dropit; /* drop request */
1234
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235err_bad_rpc:
1236 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001237 svc_putnl(resv, 1); /* REJECT */
1238 svc_putnl(resv, 0); /* RPC_MISMATCH */
1239 svc_putnl(resv, 2); /* Only RPCv2 supported */
1240 svc_putnl(resv, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 goto sendit;
1242
1243err_bad_auth:
1244 dprintk("svc: authentication failed (%d)\n", ntohl(auth_stat));
1245 serv->sv_stats->rpcbadauth++;
1246 /* Restore write pointer to location of accept status: */
J.Bruce Fields8f8e05c2006-10-04 02:16:08 -07001247 xdr_ressize_check(rqstp, reply_statp);
Alexey Dobriyan76994312006-09-26 22:28:46 -07001248 svc_putnl(resv, 1); /* REJECT */
1249 svc_putnl(resv, 1); /* AUTH_ERROR */
1250 svc_putnl(resv, ntohl(auth_stat)); /* status */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 goto sendit;
1252
1253err_bad_prog:
Andreas Gruenbacher9ba02632005-06-22 17:16:24 +00001254 dprintk("svc: unknown program %d\n", prog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001256 svc_putnl(resv, RPC_PROG_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 goto sendit;
1258
1259err_bad_vers:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001260 svc_printk(rqstp, "unknown version (%d for prog %d, %s)\n",
NeilBrown34e9a632007-01-29 13:19:52 -08001261 vers, prog, progp->pg_name);
1262
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001264 svc_putnl(resv, RPC_PROG_MISMATCH);
1265 svc_putnl(resv, progp->pg_lovers);
1266 svc_putnl(resv, progp->pg_hivers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 goto sendit;
1268
1269err_bad_proc:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001270 svc_printk(rqstp, "unknown procedure (%d)\n", proc);
NeilBrown34e9a632007-01-29 13:19:52 -08001271
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001273 svc_putnl(resv, RPC_PROC_UNAVAIL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 goto sendit;
1275
1276err_garbage:
Dr. David Alan Gilbert354ecbb2007-08-25 16:09:27 +01001277 svc_printk(rqstp, "failed to decode args\n");
NeilBrown34e9a632007-01-29 13:19:52 -08001278
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 rpc_stat = rpc_garbage_args;
1280err_bad:
1281 serv->sv_stats->rpcbadfmt++;
Alexey Dobriyan76994312006-09-26 22:28:46 -07001282 svc_putnl(resv, ntohl(rpc_stat));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 goto sendit;
1284}
Trond Myklebust24c37672008-12-23 16:30:12 -05001285EXPORT_SYMBOL_GPL(svc_process);
Greg Banks7adae482006-10-04 02:15:47 -07001286
1287/*
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001288 * Process the RPC request.
1289 */
1290int
1291svc_process(struct svc_rqst *rqstp)
1292{
1293 struct kvec *argv = &rqstp->rq_arg.head[0];
1294 struct kvec *resv = &rqstp->rq_res.head[0];
1295 struct svc_serv *serv = rqstp->rq_server;
1296 u32 dir;
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001297
1298 /*
1299 * Setup response xdr_buf.
1300 * Initially it has just one page
1301 */
1302 rqstp->rq_resused = 1;
1303 resv->iov_base = page_address(rqstp->rq_respages[0]);
1304 resv->iov_len = 0;
1305 rqstp->rq_res.pages = rqstp->rq_respages + 1;
1306 rqstp->rq_res.len = 0;
1307 rqstp->rq_res.page_base = 0;
1308 rqstp->rq_res.page_len = 0;
1309 rqstp->rq_res.buflen = PAGE_SIZE;
1310 rqstp->rq_res.tail[0].iov_base = NULL;
1311 rqstp->rq_res.tail[0].iov_len = 0;
1312
1313 rqstp->rq_xid = svc_getu32(argv);
1314
1315 dir = svc_getnl(argv);
1316 if (dir != 0) {
1317 /* direction != CALL */
1318 svc_printk(rqstp, "bad direction %d, dropping request\n", dir);
1319 serv->sv_stats->rpcbadfmt++;
1320 svc_drop(rqstp);
1321 return 0;
1322 }
1323
Andy Adamson4b5b3ba2011-01-06 02:04:24 +00001324 /* Returns 1 for send, 0 for drop */
1325 if (svc_process_common(rqstp, argv, resv))
1326 return svc_send(rqstp);
1327 else {
1328 svc_drop(rqstp);
1329 return 0;
1330 }
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001331}
1332
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001333#if defined(CONFIG_SUNRPC_BACKCHANNEL)
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001334/*
1335 * Process a backchannel RPC request that arrived over an existing
1336 * outbound connection
1337 */
1338int
1339bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
1340 struct svc_rqst *rqstp)
1341{
1342 struct kvec *argv = &rqstp->rq_arg.head[0];
1343 struct kvec *resv = &rqstp->rq_res.head[0];
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001344
1345 /* Build the svc_rqst used by the common processing routine */
Andy Adamson4a19de02011-01-06 02:04:35 +00001346 rqstp->rq_xprt = serv->sv_bc_xprt;
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001347 rqstp->rq_xid = req->rq_xid;
1348 rqstp->rq_prot = req->rq_xprt->prot;
1349 rqstp->rq_server = serv;
1350
1351 rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
1352 memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
1353 memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
1354 memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
1355
1356 /* reset result send buffer "put" position */
1357 resv->iov_len = 0;
1358
1359 if (rqstp->rq_prot != IPPROTO_TCP) {
1360 printk(KERN_ERR "No support for Non-TCP transports!\n");
1361 BUG();
1362 }
1363
1364 /*
1365 * Skip the next two words because they've already been
1366 * processed in the trasport
1367 */
1368 svc_getu32(argv); /* XID */
1369 svc_getnl(argv); /* CALLDIR */
1370
Andy Adamson4b5b3ba2011-01-06 02:04:24 +00001371 /* Returns 1 for send, 0 for drop */
1372 if (svc_process_common(rqstp, argv, resv)) {
1373 memcpy(&req->rq_snd_buf, &rqstp->rq_res,
1374 sizeof(req->rq_snd_buf));
1375 return bc_send(req);
1376 } else {
Trond Myklebustb3b02ae2012-05-31 15:26:38 -04001377 /* drop request */
1378 xprt_free_bc_request(req);
Andy Adamson4b5b3ba2011-01-06 02:04:24 +00001379 return 0;
1380 }
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001381}
Trond Myklebust0d961aa2011-07-13 19:24:15 -04001382EXPORT_SYMBOL_GPL(bc_svc_process);
Trond Myklebust9e00abc2011-07-13 19:20:49 -04001383#endif /* CONFIG_SUNRPC_BACKCHANNEL */
Ricardo Labiaga4d6bbb62009-04-01 09:23:07 -04001384
Ricardo Labiaga1cad7ea2009-04-01 09:23:06 -04001385/*
Greg Banks7adae482006-10-04 02:15:47 -07001386 * Return (transport-specific) limit on the rpc payload.
1387 */
1388u32 svc_max_payload(const struct svc_rqst *rqstp)
1389{
Tom Tucker49023152007-12-30 21:07:21 -06001390 u32 max = rqstp->rq_xprt->xpt_class->xcl_max_payload;
Greg Banks7adae482006-10-04 02:15:47 -07001391
NeilBrownc6b0a9f2006-10-06 00:44:05 -07001392 if (rqstp->rq_server->sv_max_payload < max)
1393 max = rqstp->rq_server->sv_max_payload;
Greg Banks7adae482006-10-04 02:15:47 -07001394 return max;
1395}
1396EXPORT_SYMBOL_GPL(svc_max_payload);