kern_mbuf.c revision 249843
1/*- 2 * Copyright (c) 2004, 2005, 3 * Bosko Milekic <bmilekic@FreeBSD.org>. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: head/sys/kern/kern_mbuf.c 249843 2013-04-24 13:54:55Z andre $"); 30 31#include "opt_param.h" 32 33#include <sys/param.h> 34#include <sys/malloc.h> 35#include <sys/systm.h> 36#include <sys/mbuf.h> 37#include <sys/domain.h> 38#include <sys/eventhandler.h> 39#include <sys/kernel.h> 40#include <sys/protosw.h> 41#include <sys/smp.h> 42#include <sys/sysctl.h> 43 44#include <security/mac/mac_framework.h> 45 46#include <vm/vm.h> 47#include <vm/vm_extern.h> 48#include <vm/vm_kern.h> 49#include <vm/vm_page.h> 50#include <vm/vm_map.h> 51#include <vm/uma.h> 52#include <vm/uma_int.h> 53#include <vm/uma_dbg.h> 54 55/* 56 * In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA 57 * Zones. 58 * 59 * Mbuf Clusters (2K, contiguous) are allocated from the Cluster 60 * Zone. The Zone can be capped at kern.ipc.nmbclusters, if the 61 * administrator so desires. 62 * 63 * Mbufs are allocated from a UMA Master Zone called the Mbuf 64 * Zone. 65 * 66 * Additionally, FreeBSD provides a Packet Zone, which it 67 * configures as a Secondary Zone to the Mbuf Master Zone, 68 * thus sharing backend Slab kegs with the Mbuf Master Zone. 69 * 70 * Thus common-case allocations and locking are simplified: 71 * 72 * m_clget() m_getcl() 73 * | | 74 * | .------------>[(Packet Cache)] m_get(), m_gethdr() 75 * | | [ Packet ] | 76 * [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ] 77 * [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ] 78 * | \________ | 79 * [ Cluster Keg ] \ / 80 * | [ Mbuf Keg ] 81 * [ Cluster Slabs ] | 82 * | [ Mbuf Slabs ] 83 * \____________(VM)_________________/ 84 * 85 * 86 * Whenever an object is allocated with uma_zalloc() out of 87 * one of the Zones its _ctor_ function is executed. The same 88 * for any deallocation through uma_zfree() the _dtor_ function 89 * is executed. 90 * 91 * Caches are per-CPU and are filled from the Master Zone. 92 * 93 * Whenever an object is allocated from the underlying global 94 * memory pool it gets pre-initialized with the _zinit_ functions. 95 * When the Keg's are overfull objects get decomissioned with 96 * _zfini_ functions and free'd back to the global memory pool. 97 * 98 */ 99 100int nmbufs; /* limits number of mbufs */ 101int nmbclusters; /* limits number of mbuf clusters */ 102int nmbjumbop; /* limits number of page size jumbo clusters */ 103int nmbjumbo9; /* limits number of 9k jumbo clusters */ 104int nmbjumbo16; /* limits number of 16k jumbo clusters */ 105struct mbstat mbstat; 106 107/* 108 * tunable_mbinit() has to be run before any mbuf allocations are done. 109 */ 110static void 111tunable_mbinit(void *dummy) 112{ 113 quad_t realmem, maxmbufmem; 114 115 /* 116 * The default limit for all mbuf related memory is 1/2 of all 117 * available kernel memory (physical or kmem). 118 * At most it can be 3/4 of available kernel memory. 119 */ 120 realmem = qmin((quad_t)physmem * PAGE_SIZE, 121 vm_map_max(kmem_map) - vm_map_min(kmem_map)); 122 maxmbufmem = realmem / 2; 123 TUNABLE_QUAD_FETCH("kern.maxmbufmem", &maxmbufmem); 124 if (maxmbufmem > realmem / 4 * 3) 125 maxmbufmem = realmem / 4 * 3; 126 127 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters); 128 if (nmbclusters == 0) 129 nmbclusters = maxmbufmem / MCLBYTES / 4; 130 131 TUNABLE_INT_FETCH("kern.ipc.nmbjumbop", &nmbjumbop); 132 if (nmbjumbop == 0) 133 nmbjumbop = maxmbufmem / MJUMPAGESIZE / 4; 134 135 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo9", &nmbjumbo9); 136 if (nmbjumbo9 == 0) 137 nmbjumbo9 = maxmbufmem / MJUM9BYTES / 6; 138 139 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo16", &nmbjumbo16); 140 if (nmbjumbo16 == 0) 141 nmbjumbo16 = maxmbufmem / MJUM16BYTES / 6; 142 143 /* 144 * We need at least as many mbufs as we have clusters of 145 * the various types added together. 146 */ 147 TUNABLE_INT_FETCH("kern.ipc.nmbufs", &nmbufs); 148 if (nmbufs < nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) 149 nmbufs = lmax(maxmbufmem / MSIZE / 5, 150 nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16); 151} 152SYSINIT(tunable_mbinit, SI_SUB_KMEM, SI_ORDER_MIDDLE, tunable_mbinit, NULL); 153 154static int 155sysctl_nmbclusters(SYSCTL_HANDLER_ARGS) 156{ 157 int error, newnmbclusters; 158 159 newnmbclusters = nmbclusters; 160 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 161 if (error == 0 && req->newptr) { 162 if (newnmbclusters > nmbclusters && 163 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 164 nmbclusters = newnmbclusters; 165 uma_zone_set_max(zone_clust, nmbclusters); 166 nmbclusters = uma_zone_get_max(zone_clust); 167 EVENTHANDLER_INVOKE(nmbclusters_change); 168 } else 169 error = EINVAL; 170 } 171 return (error); 172} 173SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW, 174&nmbclusters, 0, sysctl_nmbclusters, "IU", 175 "Maximum number of mbuf clusters allowed"); 176 177static int 178sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS) 179{ 180 int error, newnmbjumbop; 181 182 newnmbjumbop = nmbjumbop; 183 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req); 184 if (error == 0 && req->newptr) { 185 if (newnmbjumbop > nmbjumbop && 186 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 187 nmbjumbop = newnmbjumbop; 188 uma_zone_set_max(zone_jumbop, nmbjumbop); 189 nmbjumbop = uma_zone_get_max(zone_jumbop); 190 } else 191 error = EINVAL; 192 } 193 return (error); 194} 195SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW, 196&nmbjumbop, 0, sysctl_nmbjumbop, "IU", 197 "Maximum number of mbuf page size jumbo clusters allowed"); 198 199static int 200sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS) 201{ 202 int error, newnmbjumbo9; 203 204 newnmbjumbo9 = nmbjumbo9; 205 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req); 206 if (error == 0 && req->newptr) { 207 if (newnmbjumbo9 > nmbjumbo9&& 208 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 209 nmbjumbo9 = newnmbjumbo9; 210 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 211 nmbjumbo9 = uma_zone_get_max(zone_jumbo9); 212 } else 213 error = EINVAL; 214 } 215 return (error); 216} 217SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW, 218&nmbjumbo9, 0, sysctl_nmbjumbo9, "IU", 219 "Maximum number of mbuf 9k jumbo clusters allowed"); 220 221static int 222sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS) 223{ 224 int error, newnmbjumbo16; 225 226 newnmbjumbo16 = nmbjumbo16; 227 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req); 228 if (error == 0 && req->newptr) { 229 if (newnmbjumbo16 > nmbjumbo16 && 230 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 231 nmbjumbo16 = newnmbjumbo16; 232 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 233 nmbjumbo16 = uma_zone_get_max(zone_jumbo16); 234 } else 235 error = EINVAL; 236 } 237 return (error); 238} 239SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW, 240&nmbjumbo16, 0, sysctl_nmbjumbo16, "IU", 241 "Maximum number of mbuf 16k jumbo clusters allowed"); 242 243static int 244sysctl_nmbufs(SYSCTL_HANDLER_ARGS) 245{ 246 int error, newnmbufs; 247 248 newnmbufs = nmbufs; 249 error = sysctl_handle_int(oidp, &newnmbufs, 0, req); 250 if (error == 0 && req->newptr) { 251 if (newnmbufs > nmbufs) { 252 nmbufs = newnmbufs; 253 uma_zone_set_max(zone_mbuf, nmbufs); 254 nmbufs = uma_zone_get_max(zone_mbuf); 255 EVENTHANDLER_INVOKE(nmbufs_change); 256 } else 257 error = EINVAL; 258 } 259 return (error); 260} 261SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbuf, CTLTYPE_INT|CTLFLAG_RW, 262&nmbufs, 0, sysctl_nmbufs, "IU", 263 "Maximum number of mbufs allowed"); 264 265SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, 266 "Mbuf general information and statistics"); 267 268/* 269 * Zones from which we allocate. 270 */ 271uma_zone_t zone_mbuf; 272uma_zone_t zone_clust; 273uma_zone_t zone_pack; 274uma_zone_t zone_jumbop; 275uma_zone_t zone_jumbo9; 276uma_zone_t zone_jumbo16; 277uma_zone_t zone_ext_refcnt; 278 279/* 280 * Local prototypes. 281 */ 282static int mb_ctor_mbuf(void *, int, void *, int); 283static int mb_ctor_clust(void *, int, void *, int); 284static int mb_ctor_pack(void *, int, void *, int); 285static void mb_dtor_mbuf(void *, int, void *); 286static void mb_dtor_clust(void *, int, void *); 287static void mb_dtor_pack(void *, int, void *); 288static int mb_zinit_pack(void *, int, int); 289static void mb_zfini_pack(void *, int); 290 291static void mb_reclaim(void *); 292static void *mbuf_jumbo_alloc(uma_zone_t, int, uint8_t *, int); 293 294/* Ensure that MSIZE is a power of 2. */ 295CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); 296 297/* 298 * Initialize FreeBSD Network buffer allocation. 299 */ 300static void 301mbuf_init(void *dummy) 302{ 303 304 /* 305 * Configure UMA zones for Mbufs, Clusters, and Packets. 306 */ 307 zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, 308 mb_ctor_mbuf, mb_dtor_mbuf, 309#ifdef INVARIANTS 310 trash_init, trash_fini, 311#else 312 NULL, NULL, 313#endif 314 MSIZE - 1, UMA_ZONE_MAXBUCKET); 315 if (nmbufs > 0) 316 nmbufs = uma_zone_set_max(zone_mbuf, nmbufs); 317 uma_zone_set_warning(zone_mbuf, "kern.ipc.nmbufs limit reached"); 318 319 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, 320 mb_ctor_clust, mb_dtor_clust, 321#ifdef INVARIANTS 322 trash_init, trash_fini, 323#else 324 NULL, NULL, 325#endif 326 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 327 if (nmbclusters > 0) 328 nmbclusters = uma_zone_set_max(zone_clust, nmbclusters); 329 uma_zone_set_warning(zone_clust, "kern.ipc.nmbclusters limit reached"); 330 331 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, 332 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); 333 334 /* Make jumbo frame zone too. Page size, 9k and 16k. */ 335 zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE, 336 mb_ctor_clust, mb_dtor_clust, 337#ifdef INVARIANTS 338 trash_init, trash_fini, 339#else 340 NULL, NULL, 341#endif 342 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 343 if (nmbjumbop > 0) 344 nmbjumbop = uma_zone_set_max(zone_jumbop, nmbjumbop); 345 uma_zone_set_warning(zone_jumbop, "kern.ipc.nmbjumbop limit reached"); 346 347 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, 348 mb_ctor_clust, mb_dtor_clust, 349#ifdef INVARIANTS 350 trash_init, trash_fini, 351#else 352 NULL, NULL, 353#endif 354 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 355 uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc); 356 if (nmbjumbo9 > 0) 357 nmbjumbo9 = uma_zone_set_max(zone_jumbo9, nmbjumbo9); 358 uma_zone_set_warning(zone_jumbo9, "kern.ipc.nmbjumbo9 limit reached"); 359 360 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, 361 mb_ctor_clust, mb_dtor_clust, 362#ifdef INVARIANTS 363 trash_init, trash_fini, 364#else 365 NULL, NULL, 366#endif 367 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 368 uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc); 369 if (nmbjumbo16 > 0) 370 nmbjumbo16 = uma_zone_set_max(zone_jumbo16, nmbjumbo16); 371 uma_zone_set_warning(zone_jumbo16, "kern.ipc.nmbjumbo16 limit reached"); 372 373 zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int), 374 NULL, NULL, 375 NULL, NULL, 376 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 377 378 /* uma_prealloc() goes here... */ 379 380 /* 381 * Hook event handler for low-memory situation, used to 382 * drain protocols and push data back to the caches (UMA 383 * later pushes it back to VM). 384 */ 385 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL, 386 EVENTHANDLER_PRI_FIRST); 387 388 /* 389 * [Re]set counters and local statistics knobs. 390 * XXX Some of these should go and be replaced, but UMA stat 391 * gathering needs to be revised. 392 */ 393 mbstat.m_mbufs = 0; 394 mbstat.m_mclusts = 0; 395 mbstat.m_drain = 0; 396 mbstat.m_msize = MSIZE; 397 mbstat.m_mclbytes = MCLBYTES; 398 mbstat.m_minclsize = MINCLSIZE; 399 mbstat.m_mlen = MLEN; 400 mbstat.m_mhlen = MHLEN; 401 mbstat.m_numtypes = MT_NTYPES; 402 403 mbstat.m_mcfail = mbstat.m_mpfail = 0; 404 mbstat.sf_iocnt = 0; 405 mbstat.sf_allocwait = mbstat.sf_allocfail = 0; 406} 407SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL); 408 409/* 410 * UMA backend page allocator for the jumbo frame zones. 411 * 412 * Allocates kernel virtual memory that is backed by contiguous physical 413 * pages. 414 */ 415static void * 416mbuf_jumbo_alloc(uma_zone_t zone, int bytes, uint8_t *flags, int wait) 417{ 418 419 /* Inform UMA that this allocator uses kernel_map/object. */ 420 *flags = UMA_SLAB_KERNEL; 421 return ((void *)kmem_alloc_contig(kernel_map, bytes, wait, 422 (vm_paddr_t)0, ~(vm_paddr_t)0, 1, 0, VM_MEMATTR_DEFAULT)); 423} 424 425/* 426 * Constructor for Mbuf master zone. 427 * 428 * The 'arg' pointer points to a mb_args structure which 429 * contains call-specific information required to support the 430 * mbuf allocation API. See mbuf.h. 431 */ 432static int 433mb_ctor_mbuf(void *mem, int size, void *arg, int how) 434{ 435 struct mbuf *m; 436 struct mb_args *args; 437#ifdef MAC 438 int error; 439#endif 440 int flags; 441 short type; 442 443#ifdef INVARIANTS 444 trash_ctor(mem, size, arg, how); 445#endif 446 m = (struct mbuf *)mem; 447 args = (struct mb_args *)arg; 448 flags = args->flags; 449 type = args->type; 450 451 /* 452 * The mbuf is initialized later. The caller has the 453 * responsibility to set up any MAC labels too. 454 */ 455 if (type == MT_NOINIT) 456 return (0); 457 458 m->m_next = NULL; 459 m->m_nextpkt = NULL; 460 m->m_len = 0; 461 m->m_flags = flags; 462 m->m_type = type; 463 if (flags & M_PKTHDR) { 464 m->m_data = m->m_pktdat; 465 m->m_pkthdr.rcvif = NULL; 466 m->m_pkthdr.header = NULL; 467 m->m_pkthdr.len = 0; 468 m->m_pkthdr.csum_flags = 0; 469 m->m_pkthdr.csum_data = 0; 470 m->m_pkthdr.tso_segsz = 0; 471 m->m_pkthdr.ether_vtag = 0; 472 m->m_pkthdr.flowid = 0; 473 SLIST_INIT(&m->m_pkthdr.tags); 474#ifdef MAC 475 /* If the label init fails, fail the alloc */ 476 error = mac_mbuf_init(m, how); 477 if (error) 478 return (error); 479#endif 480 } else 481 m->m_data = m->m_dat; 482 return (0); 483} 484 485/* 486 * The Mbuf master zone destructor. 487 */ 488static void 489mb_dtor_mbuf(void *mem, int size, void *arg) 490{ 491 struct mbuf *m; 492 unsigned long flags; 493 494 m = (struct mbuf *)mem; 495 flags = (unsigned long)arg; 496 497 if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0) 498 m_tag_delete_chain(m, NULL); 499 KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__)); 500 KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__)); 501#ifdef INVARIANTS 502 trash_dtor(mem, size, arg); 503#endif 504} 505 506/* 507 * The Mbuf Packet zone destructor. 508 */ 509static void 510mb_dtor_pack(void *mem, int size, void *arg) 511{ 512 struct mbuf *m; 513 514 m = (struct mbuf *)mem; 515 if ((m->m_flags & M_PKTHDR) != 0) 516 m_tag_delete_chain(m, NULL); 517 518 /* Make sure we've got a clean cluster back. */ 519 KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__)); 520 KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__)); 521 KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__)); 522 KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__)); 523 KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__)); 524 KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__)); 525 KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__)); 526 KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__)); 527#ifdef INVARIANTS 528 trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg); 529#endif 530 /* 531 * If there are processes blocked on zone_clust, waiting for pages 532 * to be freed up, * cause them to be woken up by draining the 533 * packet zone. We are exposed to a race here * (in the check for 534 * the UMA_ZFLAG_FULL) where we might miss the flag set, but that 535 * is deliberate. We don't want to acquire the zone lock for every 536 * mbuf free. 537 */ 538 if (uma_zone_exhausted_nolock(zone_clust)) 539 zone_drain(zone_pack); 540} 541 542/* 543 * The Cluster and Jumbo[PAGESIZE|9|16] zone constructor. 544 * 545 * Here the 'arg' pointer points to the Mbuf which we 546 * are configuring cluster storage for. If 'arg' is 547 * empty we allocate just the cluster without setting 548 * the mbuf to it. See mbuf.h. 549 */ 550static int 551mb_ctor_clust(void *mem, int size, void *arg, int how) 552{ 553 struct mbuf *m; 554 u_int *refcnt; 555 int type; 556 uma_zone_t zone; 557 558#ifdef INVARIANTS 559 trash_ctor(mem, size, arg, how); 560#endif 561 switch (size) { 562 case MCLBYTES: 563 type = EXT_CLUSTER; 564 zone = zone_clust; 565 break; 566#if MJUMPAGESIZE != MCLBYTES 567 case MJUMPAGESIZE: 568 type = EXT_JUMBOP; 569 zone = zone_jumbop; 570 break; 571#endif 572 case MJUM9BYTES: 573 type = EXT_JUMBO9; 574 zone = zone_jumbo9; 575 break; 576 case MJUM16BYTES: 577 type = EXT_JUMBO16; 578 zone = zone_jumbo16; 579 break; 580 default: 581 panic("unknown cluster size"); 582 break; 583 } 584 585 m = (struct mbuf *)arg; 586 refcnt = uma_find_refcnt(zone, mem); 587 *refcnt = 1; 588 if (m != NULL) { 589 m->m_ext.ext_buf = (caddr_t)mem; 590 m->m_data = m->m_ext.ext_buf; 591 m->m_flags |= M_EXT; 592 m->m_ext.ext_free = NULL; 593 m->m_ext.ext_arg1 = NULL; 594 m->m_ext.ext_arg2 = NULL; 595 m->m_ext.ext_size = size; 596 m->m_ext.ext_type = type; 597 m->m_ext.ref_cnt = refcnt; 598 } 599 600 return (0); 601} 602 603/* 604 * The Mbuf Cluster zone destructor. 605 */ 606static void 607mb_dtor_clust(void *mem, int size, void *arg) 608{ 609#ifdef INVARIANTS 610 uma_zone_t zone; 611 612 zone = m_getzone(size); 613 KASSERT(*(uma_find_refcnt(zone, mem)) <= 1, 614 ("%s: refcnt incorrect %u", __func__, 615 *(uma_find_refcnt(zone, mem))) ); 616 617 trash_dtor(mem, size, arg); 618#endif 619} 620 621/* 622 * The Packet secondary zone's init routine, executed on the 623 * object's transition from mbuf keg slab to zone cache. 624 */ 625static int 626mb_zinit_pack(void *mem, int size, int how) 627{ 628 struct mbuf *m; 629 630 m = (struct mbuf *)mem; /* m is virgin. */ 631 if (uma_zalloc_arg(zone_clust, m, how) == NULL || 632 m->m_ext.ext_buf == NULL) 633 return (ENOMEM); 634 m->m_ext.ext_type = EXT_PACKET; /* Override. */ 635#ifdef INVARIANTS 636 trash_init(m->m_ext.ext_buf, MCLBYTES, how); 637#endif 638 return (0); 639} 640 641/* 642 * The Packet secondary zone's fini routine, executed on the 643 * object's transition from zone cache to keg slab. 644 */ 645static void 646mb_zfini_pack(void *mem, int size) 647{ 648 struct mbuf *m; 649 650 m = (struct mbuf *)mem; 651#ifdef INVARIANTS 652 trash_fini(m->m_ext.ext_buf, MCLBYTES); 653#endif 654 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL); 655#ifdef INVARIANTS 656 trash_dtor(mem, size, NULL); 657#endif 658} 659 660/* 661 * The "packet" keg constructor. 662 */ 663static int 664mb_ctor_pack(void *mem, int size, void *arg, int how) 665{ 666 struct mbuf *m; 667 struct mb_args *args; 668#ifdef MAC 669 int error; 670#endif 671 int flags; 672 short type; 673 674 m = (struct mbuf *)mem; 675 args = (struct mb_args *)arg; 676 flags = args->flags; 677 type = args->type; 678 679#ifdef INVARIANTS 680 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how); 681#endif 682 m->m_next = NULL; 683 m->m_nextpkt = NULL; 684 m->m_data = m->m_ext.ext_buf; 685 m->m_len = 0; 686 m->m_flags = (flags | M_EXT); 687 m->m_type = type; 688 689 if (flags & M_PKTHDR) { 690 m->m_pkthdr.rcvif = NULL; 691 m->m_pkthdr.len = 0; 692 m->m_pkthdr.header = NULL; 693 m->m_pkthdr.csum_flags = 0; 694 m->m_pkthdr.csum_data = 0; 695 m->m_pkthdr.tso_segsz = 0; 696 m->m_pkthdr.ether_vtag = 0; 697 m->m_pkthdr.flowid = 0; 698 SLIST_INIT(&m->m_pkthdr.tags); 699#ifdef MAC 700 /* If the label init fails, fail the alloc */ 701 error = mac_mbuf_init(m, how); 702 if (error) 703 return (error); 704#endif 705 } 706 /* m_ext is already initialized. */ 707 708 return (0); 709} 710 711int 712m_pkthdr_init(struct mbuf *m, int how) 713{ 714#ifdef MAC 715 int error; 716#endif 717 m->m_data = m->m_pktdat; 718 SLIST_INIT(&m->m_pkthdr.tags); 719 m->m_pkthdr.rcvif = NULL; 720 m->m_pkthdr.header = NULL; 721 m->m_pkthdr.len = 0; 722 m->m_pkthdr.flowid = 0; 723 m->m_pkthdr.csum_flags = 0; 724 m->m_pkthdr.csum_data = 0; 725 m->m_pkthdr.tso_segsz = 0; 726 m->m_pkthdr.ether_vtag = 0; 727#ifdef MAC 728 /* If the label init fails, fail the alloc */ 729 error = mac_mbuf_init(m, how); 730 if (error) 731 return (error); 732#endif 733 734 return (0); 735} 736 737/* 738 * This is the protocol drain routine. 739 * 740 * No locks should be held when this is called. The drain routines have to 741 * presently acquire some locks which raises the possibility of lock order 742 * reversal. 743 */ 744static void 745mb_reclaim(void *junk) 746{ 747 struct domain *dp; 748 struct protosw *pr; 749 750 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, 751 "mb_reclaim()"); 752 753 for (dp = domains; dp != NULL; dp = dp->dom_next) 754 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 755 if (pr->pr_drain != NULL) 756 (*pr->pr_drain)(); 757} 758