1/* $NetBSD: svc.c,v 1.21 2000/07/06 03:10:35 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#if defined(LIBC_SCCS) && !defined(lint) 32static char *sccsid2 = "@(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro"; 33static char *sccsid = "@(#)svc.c 2.4 88/08/11 4.0 RPCSRC"; 34#endif 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: stable/10/sys/rpc/svc.c 336928 2018-07-30 19:29:31Z rmacklem $"); 37 38/* 39 * svc.c, Server-side remote procedure call interface. 40 * 41 * There are two sets of procedures here. The xprt routines are 42 * for handling transport handles. The svc routines handle the 43 * list of service routines. 44 * 45 * Copyright (C) 1984, Sun Microsystems, Inc. 46 */ 47 48#include <sys/param.h> 49#include <sys/lock.h> 50#include <sys/kernel.h> 51#include <sys/kthread.h> 52#include <sys/malloc.h> 53#include <sys/mbuf.h> 54#include <sys/mutex.h> 55#include <sys/proc.h> 56#include <sys/queue.h> 57#include <sys/socketvar.h> 58#include <sys/systm.h> 59#include <sys/smp.h> 60#include <sys/sx.h> 61#include <sys/ucred.h> 62 63#include <rpc/rpc.h> 64#include <rpc/rpcb_clnt.h> 65#include <rpc/replay.h> 66 67#include <rpc/rpc_com.h> 68 69#define SVC_VERSQUIET 0x0001 /* keep quiet about vers mismatch */ 70#define version_keepquiet(xp) (SVC_EXT(xp)->xp_flags & SVC_VERSQUIET) 71 72static struct svc_callout *svc_find(SVCPOOL *pool, rpcprog_t, rpcvers_t, 73 char *); 74static void svc_new_thread(SVCGROUP *grp); 75static void xprt_unregister_locked(SVCXPRT *xprt); 76static void svc_change_space_used(SVCPOOL *pool, long delta); 77static bool_t svc_request_space_available(SVCPOOL *pool); 78static void svcpool_cleanup(SVCPOOL *pool); 79 80/* *************** SVCXPRT related stuff **************** */ 81 82static int svcpool_minthread_sysctl(SYSCTL_HANDLER_ARGS); 83static int svcpool_maxthread_sysctl(SYSCTL_HANDLER_ARGS); 84static int svcpool_threads_sysctl(SYSCTL_HANDLER_ARGS); 85 86SVCPOOL* 87svcpool_create(const char *name, struct sysctl_oid_list *sysctl_base) 88{ 89 SVCPOOL *pool; 90 SVCGROUP *grp; 91 int g; 92 93 pool = malloc(sizeof(SVCPOOL), M_RPC, M_WAITOK|M_ZERO); 94 95 mtx_init(&pool->sp_lock, "sp_lock", NULL, MTX_DEF); 96 pool->sp_name = name; 97 pool->sp_state = SVCPOOL_INIT; 98 pool->sp_proc = NULL; 99 TAILQ_INIT(&pool->sp_callouts); 100 TAILQ_INIT(&pool->sp_lcallouts); 101 pool->sp_minthreads = 1; 102 pool->sp_maxthreads = 1; 103 pool->sp_groupcount = 1; 104 for (g = 0; g < SVC_MAXGROUPS; g++) { 105 grp = &pool->sp_groups[g]; 106 mtx_init(&grp->sg_lock, "sg_lock", NULL, MTX_DEF); 107 grp->sg_pool = pool; 108 grp->sg_state = SVCPOOL_ACTIVE; 109 TAILQ_INIT(&grp->sg_xlist); 110 TAILQ_INIT(&grp->sg_active); 111 LIST_INIT(&grp->sg_idlethreads); 112 grp->sg_minthreads = 1; 113 grp->sg_maxthreads = 1; 114 } 115 116 /* 117 * Don't use more than a quarter of mbuf clusters. Nota bene: 118 * nmbclusters is an int, but nmbclusters*MCLBYTES may overflow 119 * on LP64 architectures, so cast to u_long to avoid undefined 120 * behavior. (ILP32 architectures cannot have nmbclusters 121 * large enough to overflow for other reasons.) 122 */ 123 pool->sp_space_high = (u_long)nmbclusters * MCLBYTES / 4; 124 pool->sp_space_low = (pool->sp_space_high / 3) * 2; 125 126 sysctl_ctx_init(&pool->sp_sysctl); 127 if (sysctl_base) { 128 SYSCTL_ADD_PROC(&pool->sp_sysctl, sysctl_base, OID_AUTO, 129 "minthreads", CTLTYPE_INT | CTLFLAG_RW, 130 pool, 0, svcpool_minthread_sysctl, "I", 131 "Minimal number of threads"); 132 SYSCTL_ADD_PROC(&pool->sp_sysctl, sysctl_base, OID_AUTO, 133 "maxthreads", CTLTYPE_INT | CTLFLAG_RW, 134 pool, 0, svcpool_maxthread_sysctl, "I", 135 "Maximal number of threads"); 136 SYSCTL_ADD_PROC(&pool->sp_sysctl, sysctl_base, OID_AUTO, 137 "threads", CTLTYPE_INT | CTLFLAG_RD, 138 pool, 0, svcpool_threads_sysctl, "I", 139 "Current number of threads"); 140 SYSCTL_ADD_INT(&pool->sp_sysctl, sysctl_base, OID_AUTO, 141 "groups", CTLFLAG_RD, &pool->sp_groupcount, 0, 142 "Number of thread groups"); 143 144 SYSCTL_ADD_ULONG(&pool->sp_sysctl, sysctl_base, OID_AUTO, 145 "request_space_used", CTLFLAG_RD, 146 &pool->sp_space_used, 147 "Space in parsed but not handled requests."); 148 149 SYSCTL_ADD_ULONG(&pool->sp_sysctl, sysctl_base, OID_AUTO, 150 "request_space_used_highest", CTLFLAG_RD, 151 &pool->sp_space_used_highest, 152 "Highest space used since reboot."); 153 154 SYSCTL_ADD_ULONG(&pool->sp_sysctl, sysctl_base, OID_AUTO, 155 "request_space_high", CTLFLAG_RW, 156 &pool->sp_space_high, 157 "Maximum space in parsed but not handled requests."); 158 159 SYSCTL_ADD_ULONG(&pool->sp_sysctl, sysctl_base, OID_AUTO, 160 "request_space_low", CTLFLAG_RW, 161 &pool->sp_space_low, 162 "Low water mark for request space."); 163 164 SYSCTL_ADD_INT(&pool->sp_sysctl, sysctl_base, OID_AUTO, 165 "request_space_throttled", CTLFLAG_RD, 166 &pool->sp_space_throttled, 0, 167 "Whether nfs requests are currently throttled"); 168 169 SYSCTL_ADD_INT(&pool->sp_sysctl, sysctl_base, OID_AUTO, 170 "request_space_throttle_count", CTLFLAG_RD, 171 &pool->sp_space_throttle_count, 0, 172 "Count of times throttling based on request space has occurred"); 173 } 174 175 return pool; 176} 177 178/* 179 * Code common to svcpool_destroy() and svcpool_close(), which cleans up 180 * the pool data structures. 181 */ 182static void 183svcpool_cleanup(SVCPOOL *pool) 184{ 185 SVCGROUP *grp; 186 SVCXPRT *xprt, *nxprt; 187 struct svc_callout *s; 188 struct svc_loss_callout *sl; 189 struct svcxprt_list cleanup; 190 int g; 191 192 TAILQ_INIT(&cleanup); 193 194 for (g = 0; g < SVC_MAXGROUPS; g++) { 195 grp = &pool->sp_groups[g]; 196 mtx_lock(&grp->sg_lock); 197 while ((xprt = TAILQ_FIRST(&grp->sg_xlist)) != NULL) { 198 xprt_unregister_locked(xprt); 199 TAILQ_INSERT_TAIL(&cleanup, xprt, xp_link); 200 } 201 mtx_unlock(&grp->sg_lock); 202 } 203 TAILQ_FOREACH_SAFE(xprt, &cleanup, xp_link, nxprt) { 204 SVC_RELEASE(xprt); 205 } 206 207 mtx_lock(&pool->sp_lock); 208 while ((s = TAILQ_FIRST(&pool->sp_callouts)) != NULL) { 209 mtx_unlock(&pool->sp_lock); 210 svc_unreg(pool, s->sc_prog, s->sc_vers); 211 mtx_lock(&pool->sp_lock); 212 } 213 while ((sl = TAILQ_FIRST(&pool->sp_lcallouts)) != NULL) { 214 mtx_unlock(&pool->sp_lock); 215 svc_loss_unreg(pool, sl->slc_dispatch); 216 mtx_lock(&pool->sp_lock); 217 } 218 mtx_unlock(&pool->sp_lock); 219} 220 221void 222svcpool_destroy(SVCPOOL *pool) 223{ 224 SVCGROUP *grp; 225 int g; 226 227 svcpool_cleanup(pool); 228 229 for (g = 0; g < SVC_MAXGROUPS; g++) { 230 grp = &pool->sp_groups[g]; 231 mtx_destroy(&grp->sg_lock); 232 } 233 mtx_destroy(&pool->sp_lock); 234 235 if (pool->sp_rcache) 236 replay_freecache(pool->sp_rcache); 237 238 sysctl_ctx_free(&pool->sp_sysctl); 239 free(pool, M_RPC); 240} 241 242/* 243 * Similar to svcpool_destroy(), except that it does not destroy the actual 244 * data structures. As such, "pool" may be used again. 245 */ 246void 247svcpool_close(SVCPOOL *pool) 248{ 249 SVCGROUP *grp; 250 int g; 251 252 svcpool_cleanup(pool); 253 254 /* Now, initialize the pool's state for a fresh svc_run() call. */ 255 mtx_lock(&pool->sp_lock); 256 pool->sp_state = SVCPOOL_INIT; 257 mtx_unlock(&pool->sp_lock); 258 for (g = 0; g < SVC_MAXGROUPS; g++) { 259 grp = &pool->sp_groups[g]; 260 mtx_lock(&grp->sg_lock); 261 grp->sg_state = SVCPOOL_ACTIVE; 262 mtx_unlock(&grp->sg_lock); 263 } 264} 265 266/* 267 * Sysctl handler to get the present thread count on a pool 268 */ 269static int 270svcpool_threads_sysctl(SYSCTL_HANDLER_ARGS) 271{ 272 SVCPOOL *pool; 273 int threads, error, g; 274 275 pool = oidp->oid_arg1; 276 threads = 0; 277 mtx_lock(&pool->sp_lock); 278 for (g = 0; g < pool->sp_groupcount; g++) 279 threads += pool->sp_groups[g].sg_threadcount; 280 mtx_unlock(&pool->sp_lock); 281 error = sysctl_handle_int(oidp, &threads, 0, req); 282 return (error); 283} 284 285/* 286 * Sysctl handler to set the minimum thread count on a pool 287 */ 288static int 289svcpool_minthread_sysctl(SYSCTL_HANDLER_ARGS) 290{ 291 SVCPOOL *pool; 292 int newminthreads, error, g; 293 294 pool = oidp->oid_arg1; 295 newminthreads = pool->sp_minthreads; 296 error = sysctl_handle_int(oidp, &newminthreads, 0, req); 297 if (error == 0 && newminthreads != pool->sp_minthreads) { 298 if (newminthreads > pool->sp_maxthreads) 299 return (EINVAL); 300 mtx_lock(&pool->sp_lock); 301 pool->sp_minthreads = newminthreads; 302 for (g = 0; g < pool->sp_groupcount; g++) { 303 pool->sp_groups[g].sg_minthreads = max(1, 304 pool->sp_minthreads / pool->sp_groupcount); 305 } 306 mtx_unlock(&pool->sp_lock); 307 } 308 return (error); 309} 310 311/* 312 * Sysctl handler to set the maximum thread count on a pool 313 */ 314static int 315svcpool_maxthread_sysctl(SYSCTL_HANDLER_ARGS) 316{ 317 SVCPOOL *pool; 318 int newmaxthreads, error, g; 319 320 pool = oidp->oid_arg1; 321 newmaxthreads = pool->sp_maxthreads; 322 error = sysctl_handle_int(oidp, &newmaxthreads, 0, req); 323 if (error == 0 && newmaxthreads != pool->sp_maxthreads) { 324 if (newmaxthreads < pool->sp_minthreads) 325 return (EINVAL); 326 mtx_lock(&pool->sp_lock); 327 pool->sp_maxthreads = newmaxthreads; 328 for (g = 0; g < pool->sp_groupcount; g++) { 329 pool->sp_groups[g].sg_maxthreads = max(1, 330 pool->sp_maxthreads / pool->sp_groupcount); 331 } 332 mtx_unlock(&pool->sp_lock); 333 } 334 return (error); 335} 336 337/* 338 * Activate a transport handle. 339 */ 340void 341xprt_register(SVCXPRT *xprt) 342{ 343 SVCPOOL *pool = xprt->xp_pool; 344 SVCGROUP *grp; 345 int g; 346 347 SVC_ACQUIRE(xprt); 348 g = atomic_fetchadd_int(&pool->sp_nextgroup, 1) % pool->sp_groupcount; 349 xprt->xp_group = grp = &pool->sp_groups[g]; 350 mtx_lock(&grp->sg_lock); 351 xprt->xp_registered = TRUE; 352 xprt->xp_active = FALSE; 353 TAILQ_INSERT_TAIL(&grp->sg_xlist, xprt, xp_link); 354 mtx_unlock(&grp->sg_lock); 355} 356 357/* 358 * De-activate a transport handle. Note: the locked version doesn't 359 * release the transport - caller must do that after dropping the pool 360 * lock. 361 */ 362static void 363xprt_unregister_locked(SVCXPRT *xprt) 364{ 365 SVCGROUP *grp = xprt->xp_group; 366 367 mtx_assert(&grp->sg_lock, MA_OWNED); 368 KASSERT(xprt->xp_registered == TRUE, 369 ("xprt_unregister_locked: not registered")); 370 xprt_inactive_locked(xprt); 371 TAILQ_REMOVE(&grp->sg_xlist, xprt, xp_link); 372 xprt->xp_registered = FALSE; 373} 374 375void 376xprt_unregister(SVCXPRT *xprt) 377{ 378 SVCGROUP *grp = xprt->xp_group; 379 380 mtx_lock(&grp->sg_lock); 381 if (xprt->xp_registered == FALSE) { 382 /* Already unregistered by another thread */ 383 mtx_unlock(&grp->sg_lock); 384 return; 385 } 386 xprt_unregister_locked(xprt); 387 mtx_unlock(&grp->sg_lock); 388 389 SVC_RELEASE(xprt); 390} 391 392/* 393 * Attempt to assign a service thread to this transport. 394 */ 395static int 396xprt_assignthread(SVCXPRT *xprt) 397{ 398 SVCGROUP *grp = xprt->xp_group; 399 SVCTHREAD *st; 400 401 mtx_assert(&grp->sg_lock, MA_OWNED); 402 st = LIST_FIRST(&grp->sg_idlethreads); 403 if (st) { 404 LIST_REMOVE(st, st_ilink); 405 SVC_ACQUIRE(xprt); 406 xprt->xp_thread = st; 407 st->st_xprt = xprt; 408 cv_signal(&st->st_cond); 409 return (TRUE); 410 } else { 411 /* 412 * See if we can create a new thread. The 413 * actual thread creation happens in 414 * svc_run_internal because our locking state 415 * is poorly defined (we are typically called 416 * from a socket upcall). Don't create more 417 * than one thread per second. 418 */ 419 if (grp->sg_state == SVCPOOL_ACTIVE 420 && grp->sg_lastcreatetime < time_uptime 421 && grp->sg_threadcount < grp->sg_maxthreads) { 422 grp->sg_state = SVCPOOL_THREADWANTED; 423 } 424 } 425 return (FALSE); 426} 427 428void 429xprt_active(SVCXPRT *xprt) 430{ 431 SVCGROUP *grp = xprt->xp_group; 432 433 mtx_lock(&grp->sg_lock); 434 435 if (!xprt->xp_registered) { 436 /* 437 * Race with xprt_unregister - we lose. 438 */ 439 mtx_unlock(&grp->sg_lock); 440 return; 441 } 442 443 if (!xprt->xp_active) { 444 xprt->xp_active = TRUE; 445 if (xprt->xp_thread == NULL) { 446 if (!svc_request_space_available(xprt->xp_pool) || 447 !xprt_assignthread(xprt)) 448 TAILQ_INSERT_TAIL(&grp->sg_active, xprt, 449 xp_alink); 450 } 451 } 452 453 mtx_unlock(&grp->sg_lock); 454} 455 456void 457xprt_inactive_locked(SVCXPRT *xprt) 458{ 459 SVCGROUP *grp = xprt->xp_group; 460 461 mtx_assert(&grp->sg_lock, MA_OWNED); 462 if (xprt->xp_active) { 463 if (xprt->xp_thread == NULL) 464 TAILQ_REMOVE(&grp->sg_active, xprt, xp_alink); 465 xprt->xp_active = FALSE; 466 } 467} 468 469void 470xprt_inactive(SVCXPRT *xprt) 471{ 472 SVCGROUP *grp = xprt->xp_group; 473 474 mtx_lock(&grp->sg_lock); 475 xprt_inactive_locked(xprt); 476 mtx_unlock(&grp->sg_lock); 477} 478 479/* 480 * Variant of xprt_inactive() for use only when sure that port is 481 * assigned to thread. For example, withing receive handlers. 482 */ 483void 484xprt_inactive_self(SVCXPRT *xprt) 485{ 486 487 KASSERT(xprt->xp_thread != NULL, 488 ("xprt_inactive_self(%p) with NULL xp_thread", xprt)); 489 xprt->xp_active = FALSE; 490} 491 492/* 493 * Add a service program to the callout list. 494 * The dispatch routine will be called when a rpc request for this 495 * program number comes in. 496 */ 497bool_t 498svc_reg(SVCXPRT *xprt, const rpcprog_t prog, const rpcvers_t vers, 499 void (*dispatch)(struct svc_req *, SVCXPRT *), 500 const struct netconfig *nconf) 501{ 502 SVCPOOL *pool = xprt->xp_pool; 503 struct svc_callout *s; 504 char *netid = NULL; 505 int flag = 0; 506 507/* VARIABLES PROTECTED BY svc_lock: s, svc_head */ 508 509 if (xprt->xp_netid) { 510 netid = strdup(xprt->xp_netid, M_RPC); 511 flag = 1; 512 } else if (nconf && nconf->nc_netid) { 513 netid = strdup(nconf->nc_netid, M_RPC); 514 flag = 1; 515 } /* must have been created with svc_raw_create */ 516 if ((netid == NULL) && (flag == 1)) { 517 return (FALSE); 518 } 519 520 mtx_lock(&pool->sp_lock); 521 if ((s = svc_find(pool, prog, vers, netid)) != NULL) { 522 if (netid) 523 free(netid, M_RPC); 524 if (s->sc_dispatch == dispatch) 525 goto rpcb_it; /* he is registering another xptr */ 526 mtx_unlock(&pool->sp_lock); 527 return (FALSE); 528 } 529 s = malloc(sizeof (struct svc_callout), M_RPC, M_NOWAIT); 530 if (s == NULL) { 531 if (netid) 532 free(netid, M_RPC); 533 mtx_unlock(&pool->sp_lock); 534 return (FALSE); 535 } 536 537 s->sc_prog = prog; 538 s->sc_vers = vers; 539 s->sc_dispatch = dispatch; 540 s->sc_netid = netid; 541 TAILQ_INSERT_TAIL(&pool->sp_callouts, s, sc_link); 542 543 if ((xprt->xp_netid == NULL) && (flag == 1) && netid) 544 ((SVCXPRT *) xprt)->xp_netid = strdup(netid, M_RPC); 545 546rpcb_it: 547 mtx_unlock(&pool->sp_lock); 548 /* now register the information with the local binder service */ 549 if (nconf) { 550 bool_t dummy; 551 struct netconfig tnc; 552 struct netbuf nb; 553 tnc = *nconf; 554 nb.buf = &xprt->xp_ltaddr; 555 nb.len = xprt->xp_ltaddr.ss_len; 556 dummy = rpcb_set(prog, vers, &tnc, &nb); 557 return (dummy); 558 } 559 return (TRUE); 560} 561 562/* 563 * Remove a service program from the callout list. 564 */ 565void 566svc_unreg(SVCPOOL *pool, const rpcprog_t prog, const rpcvers_t vers) 567{ 568 struct svc_callout *s; 569 570 /* unregister the information anyway */ 571 (void) rpcb_unset(prog, vers, NULL); 572 mtx_lock(&pool->sp_lock); 573 while ((s = svc_find(pool, prog, vers, NULL)) != NULL) { 574 TAILQ_REMOVE(&pool->sp_callouts, s, sc_link); 575 if (s->sc_netid) 576 mem_free(s->sc_netid, sizeof (s->sc_netid) + 1); 577 mem_free(s, sizeof (struct svc_callout)); 578 } 579 mtx_unlock(&pool->sp_lock); 580} 581 582/* 583 * Add a service connection loss program to the callout list. 584 * The dispatch routine will be called when some port in ths pool die. 585 */ 586bool_t 587svc_loss_reg(SVCXPRT *xprt, void (*dispatch)(SVCXPRT *)) 588{ 589 SVCPOOL *pool = xprt->xp_pool; 590 struct svc_loss_callout *s; 591 592 mtx_lock(&pool->sp_lock); 593 TAILQ_FOREACH(s, &pool->sp_lcallouts, slc_link) { 594 if (s->slc_dispatch == dispatch) 595 break; 596 } 597 if (s != NULL) { 598 mtx_unlock(&pool->sp_lock); 599 return (TRUE); 600 } 601 s = malloc(sizeof(struct svc_loss_callout), M_RPC, M_NOWAIT); 602 if (s == NULL) { 603 mtx_unlock(&pool->sp_lock); 604 return (FALSE); 605 } 606 s->slc_dispatch = dispatch; 607 TAILQ_INSERT_TAIL(&pool->sp_lcallouts, s, slc_link); 608 mtx_unlock(&pool->sp_lock); 609 return (TRUE); 610} 611 612/* 613 * Remove a service connection loss program from the callout list. 614 */ 615void 616svc_loss_unreg(SVCPOOL *pool, void (*dispatch)(SVCXPRT *)) 617{ 618 struct svc_loss_callout *s; 619 620 mtx_lock(&pool->sp_lock); 621 TAILQ_FOREACH(s, &pool->sp_lcallouts, slc_link) { 622 if (s->slc_dispatch == dispatch) { 623 TAILQ_REMOVE(&pool->sp_lcallouts, s, slc_link); 624 free(s, M_RPC); 625 break; 626 } 627 } 628 mtx_unlock(&pool->sp_lock); 629} 630 631/* ********************** CALLOUT list related stuff ************* */ 632 633/* 634 * Search the callout list for a program number, return the callout 635 * struct. 636 */ 637static struct svc_callout * 638svc_find(SVCPOOL *pool, rpcprog_t prog, rpcvers_t vers, char *netid) 639{ 640 struct svc_callout *s; 641 642 mtx_assert(&pool->sp_lock, MA_OWNED); 643 TAILQ_FOREACH(s, &pool->sp_callouts, sc_link) { 644 if (s->sc_prog == prog && s->sc_vers == vers 645 && (netid == NULL || s->sc_netid == NULL || 646 strcmp(netid, s->sc_netid) == 0)) 647 break; 648 } 649 650 return (s); 651} 652 653/* ******************* REPLY GENERATION ROUTINES ************ */ 654 655static bool_t 656svc_sendreply_common(struct svc_req *rqstp, struct rpc_msg *rply, 657 struct mbuf *body) 658{ 659 SVCXPRT *xprt = rqstp->rq_xprt; 660 bool_t ok; 661 662 if (rqstp->rq_args) { 663 m_freem(rqstp->rq_args); 664 rqstp->rq_args = NULL; 665 } 666 667 if (xprt->xp_pool->sp_rcache) 668 replay_setreply(xprt->xp_pool->sp_rcache, 669 rply, svc_getrpccaller(rqstp), body); 670 671 if (!SVCAUTH_WRAP(&rqstp->rq_auth, &body)) 672 return (FALSE); 673 674 ok = SVC_REPLY(xprt, rply, rqstp->rq_addr, body, &rqstp->rq_reply_seq); 675 if (rqstp->rq_addr) { 676 free(rqstp->rq_addr, M_SONAME); 677 rqstp->rq_addr = NULL; 678 } 679 680 return (ok); 681} 682 683/* 684 * Send a reply to an rpc request 685 */ 686bool_t 687svc_sendreply(struct svc_req *rqstp, xdrproc_t xdr_results, void * xdr_location) 688{ 689 struct rpc_msg rply; 690 struct mbuf *m; 691 XDR xdrs; 692 bool_t ok; 693 694 rply.rm_xid = rqstp->rq_xid; 695 rply.rm_direction = REPLY; 696 rply.rm_reply.rp_stat = MSG_ACCEPTED; 697 rply.acpted_rply.ar_verf = rqstp->rq_verf; 698 rply.acpted_rply.ar_stat = SUCCESS; 699 rply.acpted_rply.ar_results.where = NULL; 700 rply.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void; 701 702 m = m_getcl(M_WAITOK, MT_DATA, 0); 703 xdrmbuf_create(&xdrs, m, XDR_ENCODE); 704 ok = xdr_results(&xdrs, xdr_location); 705 XDR_DESTROY(&xdrs); 706 707 if (ok) { 708 return (svc_sendreply_common(rqstp, &rply, m)); 709 } else { 710 m_freem(m); 711 return (FALSE); 712 } 713} 714 715bool_t 716svc_sendreply_mbuf(struct svc_req *rqstp, struct mbuf *m) 717{ 718 struct rpc_msg rply; 719 720 rply.rm_xid = rqstp->rq_xid; 721 rply.rm_direction = REPLY; 722 rply.rm_reply.rp_stat = MSG_ACCEPTED; 723 rply.acpted_rply.ar_verf = rqstp->rq_verf; 724 rply.acpted_rply.ar_stat = SUCCESS; 725 rply.acpted_rply.ar_results.where = NULL; 726 rply.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void; 727 728 return (svc_sendreply_common(rqstp, &rply, m)); 729} 730 731/* 732 * No procedure error reply 733 */ 734void 735svcerr_noproc(struct svc_req *rqstp) 736{ 737 SVCXPRT *xprt = rqstp->rq_xprt; 738 struct rpc_msg rply; 739 740 rply.rm_xid = rqstp->rq_xid; 741 rply.rm_direction = REPLY; 742 rply.rm_reply.rp_stat = MSG_ACCEPTED; 743 rply.acpted_rply.ar_verf = rqstp->rq_verf; 744 rply.acpted_rply.ar_stat = PROC_UNAVAIL; 745 746 if (xprt->xp_pool->sp_rcache) 747 replay_setreply(xprt->xp_pool->sp_rcache, 748 &rply, svc_getrpccaller(rqstp), NULL); 749 750 svc_sendreply_common(rqstp, &rply, NULL); 751} 752 753/* 754 * Can't decode args error reply 755 */ 756void 757svcerr_decode(struct svc_req *rqstp) 758{ 759 SVCXPRT *xprt = rqstp->rq_xprt; 760 struct rpc_msg rply; 761 762 rply.rm_xid = rqstp->rq_xid; 763 rply.rm_direction = REPLY; 764 rply.rm_reply.rp_stat = MSG_ACCEPTED; 765 rply.acpted_rply.ar_verf = rqstp->rq_verf; 766 rply.acpted_rply.ar_stat = GARBAGE_ARGS; 767 768 if (xprt->xp_pool->sp_rcache) 769 replay_setreply(xprt->xp_pool->sp_rcache, 770 &rply, (struct sockaddr *) &xprt->xp_rtaddr, NULL); 771 772 svc_sendreply_common(rqstp, &rply, NULL); 773} 774 775/* 776 * Some system error 777 */ 778void 779svcerr_systemerr(struct svc_req *rqstp) 780{ 781 SVCXPRT *xprt = rqstp->rq_xprt; 782 struct rpc_msg rply; 783 784 rply.rm_xid = rqstp->rq_xid; 785 rply.rm_direction = REPLY; 786 rply.rm_reply.rp_stat = MSG_ACCEPTED; 787 rply.acpted_rply.ar_verf = rqstp->rq_verf; 788 rply.acpted_rply.ar_stat = SYSTEM_ERR; 789 790 if (xprt->xp_pool->sp_rcache) 791 replay_setreply(xprt->xp_pool->sp_rcache, 792 &rply, svc_getrpccaller(rqstp), NULL); 793 794 svc_sendreply_common(rqstp, &rply, NULL); 795} 796 797/* 798 * Authentication error reply 799 */ 800void 801svcerr_auth(struct svc_req *rqstp, enum auth_stat why) 802{ 803 SVCXPRT *xprt = rqstp->rq_xprt; 804 struct rpc_msg rply; 805 806 rply.rm_xid = rqstp->rq_xid; 807 rply.rm_direction = REPLY; 808 rply.rm_reply.rp_stat = MSG_DENIED; 809 rply.rjcted_rply.rj_stat = AUTH_ERROR; 810 rply.rjcted_rply.rj_why = why; 811 812 if (xprt->xp_pool->sp_rcache) 813 replay_setreply(xprt->xp_pool->sp_rcache, 814 &rply, svc_getrpccaller(rqstp), NULL); 815 816 svc_sendreply_common(rqstp, &rply, NULL); 817} 818 819/* 820 * Auth too weak error reply 821 */ 822void 823svcerr_weakauth(struct svc_req *rqstp) 824{ 825 826 svcerr_auth(rqstp, AUTH_TOOWEAK); 827} 828 829/* 830 * Program unavailable error reply 831 */ 832void 833svcerr_noprog(struct svc_req *rqstp) 834{ 835 SVCXPRT *xprt = rqstp->rq_xprt; 836 struct rpc_msg rply; 837 838 rply.rm_xid = rqstp->rq_xid; 839 rply.rm_direction = REPLY; 840 rply.rm_reply.rp_stat = MSG_ACCEPTED; 841 rply.acpted_rply.ar_verf = rqstp->rq_verf; 842 rply.acpted_rply.ar_stat = PROG_UNAVAIL; 843 844 if (xprt->xp_pool->sp_rcache) 845 replay_setreply(xprt->xp_pool->sp_rcache, 846 &rply, svc_getrpccaller(rqstp), NULL); 847 848 svc_sendreply_common(rqstp, &rply, NULL); 849} 850 851/* 852 * Program version mismatch error reply 853 */ 854void 855svcerr_progvers(struct svc_req *rqstp, rpcvers_t low_vers, rpcvers_t high_vers) 856{ 857 SVCXPRT *xprt = rqstp->rq_xprt; 858 struct rpc_msg rply; 859 860 rply.rm_xid = rqstp->rq_xid; 861 rply.rm_direction = REPLY; 862 rply.rm_reply.rp_stat = MSG_ACCEPTED; 863 rply.acpted_rply.ar_verf = rqstp->rq_verf; 864 rply.acpted_rply.ar_stat = PROG_MISMATCH; 865 rply.acpted_rply.ar_vers.low = (uint32_t)low_vers; 866 rply.acpted_rply.ar_vers.high = (uint32_t)high_vers; 867 868 if (xprt->xp_pool->sp_rcache) 869 replay_setreply(xprt->xp_pool->sp_rcache, 870 &rply, svc_getrpccaller(rqstp), NULL); 871 872 svc_sendreply_common(rqstp, &rply, NULL); 873} 874 875/* 876 * Allocate a new server transport structure. All fields are 877 * initialized to zero and xp_p3 is initialized to point at an 878 * extension structure to hold various flags and authentication 879 * parameters. 880 */ 881SVCXPRT * 882svc_xprt_alloc(void) 883{ 884 SVCXPRT *xprt; 885 SVCXPRT_EXT *ext; 886 887 xprt = mem_alloc(sizeof(SVCXPRT)); 888 ext = mem_alloc(sizeof(SVCXPRT_EXT)); 889 xprt->xp_p3 = ext; 890 refcount_init(&xprt->xp_refs, 1); 891 892 return (xprt); 893} 894 895/* 896 * Free a server transport structure. 897 */ 898void 899svc_xprt_free(SVCXPRT *xprt) 900{ 901 902 mem_free(xprt->xp_p3, sizeof(SVCXPRT_EXT)); 903 mem_free(xprt, sizeof(SVCXPRT)); 904} 905 906/* ******************* SERVER INPUT STUFF ******************* */ 907 908/* 909 * Read RPC requests from a transport and queue them to be 910 * executed. We handle authentication and replay cache replies here. 911 * Actually dispatching the RPC is deferred till svc_executereq. 912 */ 913static enum xprt_stat 914svc_getreq(SVCXPRT *xprt, struct svc_req **rqstp_ret) 915{ 916 SVCPOOL *pool = xprt->xp_pool; 917 struct svc_req *r; 918 struct rpc_msg msg; 919 struct mbuf *args; 920 struct svc_loss_callout *s; 921 enum xprt_stat stat; 922 923 /* now receive msgs from xprtprt (support batch calls) */ 924 r = malloc(sizeof(*r), M_RPC, M_WAITOK|M_ZERO); 925 926 msg.rm_call.cb_cred.oa_base = r->rq_credarea; 927 msg.rm_call.cb_verf.oa_base = &r->rq_credarea[MAX_AUTH_BYTES]; 928 r->rq_clntcred = &r->rq_credarea[2*MAX_AUTH_BYTES]; 929 if (SVC_RECV(xprt, &msg, &r->rq_addr, &args)) { 930 enum auth_stat why; 931 932 /* 933 * Handle replays and authenticate before queuing the 934 * request to be executed. 935 */ 936 SVC_ACQUIRE(xprt); 937 r->rq_xprt = xprt; 938 if (pool->sp_rcache) { 939 struct rpc_msg repmsg; 940 struct mbuf *repbody; 941 enum replay_state rs; 942 rs = replay_find(pool->sp_rcache, &msg, 943 svc_getrpccaller(r), &repmsg, &repbody); 944 switch (rs) { 945 case RS_NEW: 946 break; 947 case RS_DONE: 948 SVC_REPLY(xprt, &repmsg, r->rq_addr, 949 repbody, &r->rq_reply_seq); 950 if (r->rq_addr) { 951 free(r->rq_addr, M_SONAME); 952 r->rq_addr = NULL; 953 } 954 m_freem(args); 955 goto call_done; 956 957 default: 958 m_freem(args); 959 goto call_done; 960 } 961 } 962 963 r->rq_xid = msg.rm_xid; 964 r->rq_prog = msg.rm_call.cb_prog; 965 r->rq_vers = msg.rm_call.cb_vers; 966 r->rq_proc = msg.rm_call.cb_proc; 967 r->rq_size = sizeof(*r) + m_length(args, NULL); 968 r->rq_args = args; 969 if ((why = _authenticate(r, &msg)) != AUTH_OK) { 970 /* 971 * RPCSEC_GSS uses this return code 972 * for requests that form part of its 973 * context establishment protocol and 974 * should not be dispatched to the 975 * application. 976 */ 977 if (why != RPCSEC_GSS_NODISPATCH) 978 svcerr_auth(r, why); 979 goto call_done; 980 } 981 982 if (!SVCAUTH_UNWRAP(&r->rq_auth, &r->rq_args)) { 983 svcerr_decode(r); 984 goto call_done; 985 } 986 987 /* 988 * Everything checks out, return request to caller. 989 */ 990 *rqstp_ret = r; 991 r = NULL; 992 } 993call_done: 994 if (r) { 995 svc_freereq(r); 996 r = NULL; 997 } 998 if ((stat = SVC_STAT(xprt)) == XPRT_DIED) { 999 TAILQ_FOREACH(s, &pool->sp_lcallouts, slc_link) 1000 (*s->slc_dispatch)(xprt); 1001 xprt_unregister(xprt); 1002 } 1003 1004 return (stat); 1005} 1006 1007static void 1008svc_executereq(struct svc_req *rqstp) 1009{ 1010 SVCXPRT *xprt = rqstp->rq_xprt; 1011 SVCPOOL *pool = xprt->xp_pool; 1012 int prog_found; 1013 rpcvers_t low_vers; 1014 rpcvers_t high_vers; 1015 struct svc_callout *s; 1016 1017 /* now match message with a registered service*/ 1018 prog_found = FALSE; 1019 low_vers = (rpcvers_t) -1L; 1020 high_vers = (rpcvers_t) 0L; 1021 TAILQ_FOREACH(s, &pool->sp_callouts, sc_link) { 1022 if (s->sc_prog == rqstp->rq_prog) { 1023 if (s->sc_vers == rqstp->rq_vers) { 1024 /* 1025 * We hand ownership of r to the 1026 * dispatch method - they must call 1027 * svc_freereq. 1028 */ 1029 (*s->sc_dispatch)(rqstp, xprt); 1030 return; 1031 } /* found correct version */ 1032 prog_found = TRUE; 1033 if (s->sc_vers < low_vers) 1034 low_vers = s->sc_vers; 1035 if (s->sc_vers > high_vers) 1036 high_vers = s->sc_vers; 1037 } /* found correct program */ 1038 } 1039 1040 /* 1041 * if we got here, the program or version 1042 * is not served ... 1043 */ 1044 if (prog_found) 1045 svcerr_progvers(rqstp, low_vers, high_vers); 1046 else 1047 svcerr_noprog(rqstp); 1048 1049 svc_freereq(rqstp); 1050} 1051 1052static void 1053svc_checkidle(SVCGROUP *grp) 1054{ 1055 SVCXPRT *xprt, *nxprt; 1056 time_t timo; 1057 struct svcxprt_list cleanup; 1058 1059 TAILQ_INIT(&cleanup); 1060 TAILQ_FOREACH_SAFE(xprt, &grp->sg_xlist, xp_link, nxprt) { 1061 /* 1062 * Only some transports have idle timers. Don't time 1063 * something out which is just waking up. 1064 */ 1065 if (!xprt->xp_idletimeout || xprt->xp_thread) 1066 continue; 1067 1068 timo = xprt->xp_lastactive + xprt->xp_idletimeout; 1069 if (time_uptime > timo) { 1070 xprt_unregister_locked(xprt); 1071 TAILQ_INSERT_TAIL(&cleanup, xprt, xp_link); 1072 } 1073 } 1074 1075 mtx_unlock(&grp->sg_lock); 1076 TAILQ_FOREACH_SAFE(xprt, &cleanup, xp_link, nxprt) { 1077 SVC_RELEASE(xprt); 1078 } 1079 mtx_lock(&grp->sg_lock); 1080} 1081 1082static void 1083svc_assign_waiting_sockets(SVCPOOL *pool) 1084{ 1085 SVCGROUP *grp; 1086 SVCXPRT *xprt; 1087 int g; 1088 1089 for (g = 0; g < pool->sp_groupcount; g++) { 1090 grp = &pool->sp_groups[g]; 1091 mtx_lock(&grp->sg_lock); 1092 while ((xprt = TAILQ_FIRST(&grp->sg_active)) != NULL) { 1093 if (xprt_assignthread(xprt)) 1094 TAILQ_REMOVE(&grp->sg_active, xprt, xp_alink); 1095 else 1096 break; 1097 } 1098 mtx_unlock(&grp->sg_lock); 1099 } 1100} 1101 1102static void 1103svc_change_space_used(SVCPOOL *pool, long delta) 1104{ 1105 unsigned long value; 1106 1107 value = atomic_fetchadd_long(&pool->sp_space_used, delta) + delta; 1108 if (delta > 0) { 1109 if (value >= pool->sp_space_high && !pool->sp_space_throttled) { 1110 pool->sp_space_throttled = TRUE; 1111 pool->sp_space_throttle_count++; 1112 } 1113 if (value > pool->sp_space_used_highest) 1114 pool->sp_space_used_highest = value; 1115 } else { 1116 if (value < pool->sp_space_low && pool->sp_space_throttled) { 1117 pool->sp_space_throttled = FALSE; 1118 svc_assign_waiting_sockets(pool); 1119 } 1120 } 1121} 1122 1123static bool_t 1124svc_request_space_available(SVCPOOL *pool) 1125{ 1126 1127 if (pool->sp_space_throttled) 1128 return (FALSE); 1129 return (TRUE); 1130} 1131 1132static void 1133svc_run_internal(SVCGROUP *grp, bool_t ismaster) 1134{ 1135 SVCPOOL *pool = grp->sg_pool; 1136 SVCTHREAD *st, *stpref; 1137 SVCXPRT *xprt; 1138 enum xprt_stat stat; 1139 struct svc_req *rqstp; 1140 struct proc *p; 1141 long sz; 1142 int error; 1143 1144 st = mem_alloc(sizeof(*st)); 1145 mtx_init(&st->st_lock, "st_lock", NULL, MTX_DEF); 1146 st->st_pool = pool; 1147 st->st_xprt = NULL; 1148 STAILQ_INIT(&st->st_reqs); 1149 cv_init(&st->st_cond, "rpcsvc"); 1150 1151 mtx_lock(&grp->sg_lock); 1152 1153 /* 1154 * If we are a new thread which was spawned to cope with 1155 * increased load, set the state back to SVCPOOL_ACTIVE. 1156 */ 1157 if (grp->sg_state == SVCPOOL_THREADSTARTING) 1158 grp->sg_state = SVCPOOL_ACTIVE; 1159 1160 while (grp->sg_state != SVCPOOL_CLOSING) { 1161 /* 1162 * Create new thread if requested. 1163 */ 1164 if (grp->sg_state == SVCPOOL_THREADWANTED) { 1165 grp->sg_state = SVCPOOL_THREADSTARTING; 1166 grp->sg_lastcreatetime = time_uptime; 1167 mtx_unlock(&grp->sg_lock); 1168 svc_new_thread(grp); 1169 mtx_lock(&grp->sg_lock); 1170 continue; 1171 } 1172 1173 /* 1174 * Check for idle transports once per second. 1175 */ 1176 if (time_uptime > grp->sg_lastidlecheck) { 1177 grp->sg_lastidlecheck = time_uptime; 1178 svc_checkidle(grp); 1179 } 1180 1181 xprt = st->st_xprt; 1182 if (!xprt) { 1183 /* 1184 * Enforce maxthreads count. 1185 */ 1186 if (!ismaster && grp->sg_threadcount > 1187 grp->sg_maxthreads) 1188 break; 1189 1190 /* 1191 * Before sleeping, see if we can find an 1192 * active transport which isn't being serviced 1193 * by a thread. 1194 */ 1195 if (svc_request_space_available(pool) && 1196 (xprt = TAILQ_FIRST(&grp->sg_active)) != NULL) { 1197 TAILQ_REMOVE(&grp->sg_active, xprt, xp_alink); 1198 SVC_ACQUIRE(xprt); 1199 xprt->xp_thread = st; 1200 st->st_xprt = xprt; 1201 continue; 1202 } 1203 1204 LIST_INSERT_HEAD(&grp->sg_idlethreads, st, st_ilink); 1205 if (ismaster || (!ismaster && 1206 grp->sg_threadcount > grp->sg_minthreads)) 1207 error = cv_timedwait_sig(&st->st_cond, 1208 &grp->sg_lock, 5 * hz); 1209 else 1210 error = cv_wait_sig(&st->st_cond, 1211 &grp->sg_lock); 1212 if (st->st_xprt == NULL) 1213 LIST_REMOVE(st, st_ilink); 1214 1215 /* 1216 * Reduce worker thread count when idle. 1217 */ 1218 if (error == EWOULDBLOCK) { 1219 if (!ismaster 1220 && (grp->sg_threadcount 1221 > grp->sg_minthreads) 1222 && !st->st_xprt) 1223 break; 1224 } else if (error != 0) { 1225 KASSERT(error == EINTR || error == ERESTART, 1226 ("non-signal error %d", error)); 1227 mtx_unlock(&grp->sg_lock); 1228 p = curproc; 1229 PROC_LOCK(p); 1230 if (P_SHOULDSTOP(p) || 1231 (p->p_flag & P_TOTAL_STOP) != 0) { 1232 thread_suspend_check(0); 1233 PROC_UNLOCK(p); 1234 mtx_lock(&grp->sg_lock); 1235 } else { 1236 PROC_UNLOCK(p); 1237 svc_exit(pool); 1238 mtx_lock(&grp->sg_lock); 1239 break; 1240 } 1241 } 1242 continue; 1243 } 1244 mtx_unlock(&grp->sg_lock); 1245 1246 /* 1247 * Drain the transport socket and queue up any RPCs. 1248 */ 1249 xprt->xp_lastactive = time_uptime; 1250 do { 1251 if (!svc_request_space_available(pool)) 1252 break; 1253 rqstp = NULL; 1254 stat = svc_getreq(xprt, &rqstp); 1255 if (rqstp) { 1256 svc_change_space_used(pool, rqstp->rq_size); 1257 /* 1258 * See if the application has a preference 1259 * for some other thread. 1260 */ 1261 if (pool->sp_assign) { 1262 stpref = pool->sp_assign(st, rqstp); 1263 rqstp->rq_thread = stpref; 1264 STAILQ_INSERT_TAIL(&stpref->st_reqs, 1265 rqstp, rq_link); 1266 mtx_unlock(&stpref->st_lock); 1267 if (stpref != st) 1268 rqstp = NULL; 1269 } else { 1270 rqstp->rq_thread = st; 1271 STAILQ_INSERT_TAIL(&st->st_reqs, 1272 rqstp, rq_link); 1273 } 1274 } 1275 } while (rqstp == NULL && stat == XPRT_MOREREQS 1276 && grp->sg_state != SVCPOOL_CLOSING); 1277 1278 /* 1279 * Move this transport to the end of the active list to 1280 * ensure fairness when multiple transports are active. 1281 * If this was the last queued request, svc_getreq will end 1282 * up calling xprt_inactive to remove from the active list. 1283 */ 1284 mtx_lock(&grp->sg_lock); 1285 xprt->xp_thread = NULL; 1286 st->st_xprt = NULL; 1287 if (xprt->xp_active) { 1288 if (!svc_request_space_available(pool) || 1289 !xprt_assignthread(xprt)) 1290 TAILQ_INSERT_TAIL(&grp->sg_active, 1291 xprt, xp_alink); 1292 } 1293 mtx_unlock(&grp->sg_lock); 1294 SVC_RELEASE(xprt); 1295 1296 /* 1297 * Execute what we have queued. 1298 */ 1299 mtx_lock(&st->st_lock); 1300 while ((rqstp = STAILQ_FIRST(&st->st_reqs)) != NULL) { 1301 STAILQ_REMOVE_HEAD(&st->st_reqs, rq_link); 1302 mtx_unlock(&st->st_lock); 1303 sz = (long)rqstp->rq_size; 1304 svc_executereq(rqstp); 1305 svc_change_space_used(pool, -sz); 1306 mtx_lock(&st->st_lock); 1307 } 1308 mtx_unlock(&st->st_lock); 1309 mtx_lock(&grp->sg_lock); 1310 } 1311 1312 if (st->st_xprt) { 1313 xprt = st->st_xprt; 1314 st->st_xprt = NULL; 1315 SVC_RELEASE(xprt); 1316 } 1317 KASSERT(STAILQ_EMPTY(&st->st_reqs), ("stray reqs on exit")); 1318 mtx_destroy(&st->st_lock); 1319 cv_destroy(&st->st_cond); 1320 mem_free(st, sizeof(*st)); 1321 1322 grp->sg_threadcount--; 1323 if (!ismaster) 1324 wakeup(grp); 1325 mtx_unlock(&grp->sg_lock); 1326} 1327 1328static void 1329svc_thread_start(void *arg) 1330{ 1331 1332 svc_run_internal((SVCGROUP *) arg, FALSE); 1333 kthread_exit(); 1334} 1335 1336static void 1337svc_new_thread(SVCGROUP *grp) 1338{ 1339 SVCPOOL *pool = grp->sg_pool; 1340 struct thread *td; 1341 1342 mtx_lock(&grp->sg_lock); 1343 grp->sg_threadcount++; 1344 mtx_unlock(&grp->sg_lock); 1345 kthread_add(svc_thread_start, grp, pool->sp_proc, &td, 0, 0, 1346 "%s: service", pool->sp_name); 1347} 1348 1349void 1350svc_run(SVCPOOL *pool) 1351{ 1352 int g, i; 1353 struct proc *p; 1354 struct thread *td; 1355 SVCGROUP *grp; 1356 1357 p = curproc; 1358 td = curthread; 1359 snprintf(td->td_name, sizeof(td->td_name), 1360 "%s: master", pool->sp_name); 1361 pool->sp_state = SVCPOOL_ACTIVE; 1362 pool->sp_proc = p; 1363 1364 /* Choose group count based on number of threads and CPUs. */ 1365 pool->sp_groupcount = max(1, min(SVC_MAXGROUPS, 1366 min(pool->sp_maxthreads / 2, mp_ncpus) / 6)); 1367 for (g = 0; g < pool->sp_groupcount; g++) { 1368 grp = &pool->sp_groups[g]; 1369 grp->sg_minthreads = max(1, 1370 pool->sp_minthreads / pool->sp_groupcount); 1371 grp->sg_maxthreads = max(1, 1372 pool->sp_maxthreads / pool->sp_groupcount); 1373 grp->sg_lastcreatetime = time_uptime; 1374 } 1375 1376 /* Starting threads */ 1377 pool->sp_groups[0].sg_threadcount++; 1378 for (g = 0; g < pool->sp_groupcount; g++) { 1379 grp = &pool->sp_groups[g]; 1380 for (i = ((g == 0) ? 1 : 0); i < grp->sg_minthreads; i++) 1381 svc_new_thread(grp); 1382 } 1383 svc_run_internal(&pool->sp_groups[0], TRUE); 1384 1385 /* Waiting for threads to stop. */ 1386 for (g = 0; g < pool->sp_groupcount; g++) { 1387 grp = &pool->sp_groups[g]; 1388 mtx_lock(&grp->sg_lock); 1389 while (grp->sg_threadcount > 0) 1390 msleep(grp, &grp->sg_lock, 0, "svcexit", 0); 1391 mtx_unlock(&grp->sg_lock); 1392 } 1393} 1394 1395void 1396svc_exit(SVCPOOL *pool) 1397{ 1398 SVCGROUP *grp; 1399 SVCTHREAD *st; 1400 int g; 1401 1402 pool->sp_state = SVCPOOL_CLOSING; 1403 for (g = 0; g < pool->sp_groupcount; g++) { 1404 grp = &pool->sp_groups[g]; 1405 mtx_lock(&grp->sg_lock); 1406 if (grp->sg_state != SVCPOOL_CLOSING) { 1407 grp->sg_state = SVCPOOL_CLOSING; 1408 LIST_FOREACH(st, &grp->sg_idlethreads, st_ilink) 1409 cv_signal(&st->st_cond); 1410 } 1411 mtx_unlock(&grp->sg_lock); 1412 } 1413} 1414 1415bool_t 1416svc_getargs(struct svc_req *rqstp, xdrproc_t xargs, void *args) 1417{ 1418 struct mbuf *m; 1419 XDR xdrs; 1420 bool_t stat; 1421 1422 m = rqstp->rq_args; 1423 rqstp->rq_args = NULL; 1424 1425 xdrmbuf_create(&xdrs, m, XDR_DECODE); 1426 stat = xargs(&xdrs, args); 1427 XDR_DESTROY(&xdrs); 1428 1429 return (stat); 1430} 1431 1432bool_t 1433svc_freeargs(struct svc_req *rqstp, xdrproc_t xargs, void *args) 1434{ 1435 XDR xdrs; 1436 1437 if (rqstp->rq_addr) { 1438 free(rqstp->rq_addr, M_SONAME); 1439 rqstp->rq_addr = NULL; 1440 } 1441 1442 xdrs.x_op = XDR_FREE; 1443 return (xargs(&xdrs, args)); 1444} 1445 1446void 1447svc_freereq(struct svc_req *rqstp) 1448{ 1449 SVCTHREAD *st; 1450 SVCPOOL *pool; 1451 1452 st = rqstp->rq_thread; 1453 if (st) { 1454 pool = st->st_pool; 1455 if (pool->sp_done) 1456 pool->sp_done(st, rqstp); 1457 } 1458 1459 if (rqstp->rq_auth.svc_ah_ops) 1460 SVCAUTH_RELEASE(&rqstp->rq_auth); 1461 1462 if (rqstp->rq_xprt) { 1463 SVC_RELEASE(rqstp->rq_xprt); 1464 } 1465 1466 if (rqstp->rq_addr) 1467 free(rqstp->rq_addr, M_SONAME); 1468 1469 if (rqstp->rq_args) 1470 m_freem(rqstp->rq_args); 1471 1472 free(rqstp, M_RPC); 1473} 1474