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("$FreeBSD$"); 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/uma.h> 51 #include <vm/uma_int.h> 52 #include <vm/uma_dbg.h> 53 54 /* 55 * In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA 56 * Zones. 57 * 58 * Mbuf Clusters (2K, contiguous) are allocated from the Cluster 59 * Zone. The Zone can be capped at kern.ipc.nmbclusters, if the 60 * administrator so desires. 61 * 62 * Mbufs are allocated from a UMA Master Zone called the Mbuf 63 * Zone. 64 * 65 * Additionally, FreeBSD provides a Packet Zone, which it 66 * configures as a Secondary Zone to the Mbuf Master Zone, 67 * thus sharing backend Slab kegs with the Mbuf Master Zone. 68 * 69 * Thus common-case allocations and locking are simplified: 70 * 71 * m_clget() m_getcl() 72 * | | 73 * | .------------>[(Packet Cache)] m_get(), m_gethdr() 74 * | | [ Packet ] | 75 * [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ] 76 * [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ] 77 * | \________ | 78 * [ Cluster Keg ] \ / 79 * | [ Mbuf Keg ] 80 * [ Cluster Slabs ] | 81 * | [ Mbuf Slabs ] 82 * \____________(VM)_________________/ 83 * 84 * 85 * Whenever an object is allocated with uma_zalloc() out of 86 * one of the Zones its _ctor_ function is executed. The same 87 * for any deallocation through uma_zfree() the _dtor_ function 88 * is executed. 89 * 90 * Caches are per-CPU and are filled from the Master Zone. 91 * 92 * Whenever an object is allocated from the underlying global 93 * memory pool it gets pre-initialized with the _zinit_ functions. 94 * When the Keg's are overfull objects get decomissioned with 95 * _zfini_ functions and free'd back to the global memory pool. 96 * 97 */ 98 99 int nmbclusters; /* limits number of mbuf clusters */ 100 int nmbjumbop; /* limits number of page size jumbo clusters */ 101 int nmbjumbo9; /* limits number of 9k jumbo clusters */ 102 int nmbjumbo16; /* limits number of 16k jumbo clusters */ 103 struct mbstat mbstat; 104 105 /* 106 * tunable_mbinit() has to be run before init_maxsockets() thus 107 * the SYSINIT order below is SI_ORDER_MIDDLE while init_maxsockets() 108 * runs at SI_ORDER_ANY. 109 */ 110 static void 111 tunable_mbinit(void *dummy) 112 { 113 114 /* This has to be done before VM init. */ 115 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters); 116 if (nmbclusters == 0) { 117 #ifdef VM_AUTOTUNE_NMBCLUSTERS 118 nmbclusters = VM_AUTOTUNE_NMBCLUSTERS; 119 #else 120 nmbclusters = 1024 + maxusers * 64; 121 #endif 122 #ifdef VM_MAX_AUTOTUNE_NMBCLUSTERS 123 if (nmbclusters > VM_MAX_AUTOTUNE_NMBCLUSTERS) 124 nmbclusters = VM_MAX_AUTOTUNE_NMBCLUSTERS; 125 #endif 126 } 127 128 TUNABLE_INT_FETCH("kern.ipc.nmbjumbop", &nmbjumbop); 129 if (nmbjumbop == 0) 130 nmbjumbop = nmbclusters / 2; 131 132 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo9", &nmbjumbo9); 133 if (nmbjumbo9 == 0) 134 nmbjumbo9 = nmbclusters / 4; 135 136 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo16", &nmbjumbo16); 137 if (nmbjumbo16 == 0) 138 nmbjumbo16 = nmbclusters / 8; 139 } 140 SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_mbinit, NULL); 141 142 static int 143 sysctl_nmbclusters(SYSCTL_HANDLER_ARGS) 144 { 145 int error, newnmbclusters; 146 147 newnmbclusters = nmbclusters; 148 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 149 if (error == 0 && req->newptr) { 150 if (newnmbclusters > nmbclusters) { 151 nmbclusters = newnmbclusters; 152 uma_zone_set_max(zone_clust, nmbclusters); 153 EVENTHANDLER_INVOKE(nmbclusters_change); 154 } else 155 error = EINVAL; 156 } 157 return (error); 158 } 159 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW, 160 &nmbclusters, 0, sysctl_nmbclusters, "IU", 161 "Maximum number of mbuf clusters allowed"); 162 163 static int 164 sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS) 165 { 166 int error, newnmbjumbop; 167 168 newnmbjumbop = nmbjumbop; 169 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req); 170 if (error == 0 && req->newptr) { 171 if (newnmbjumbop> nmbjumbop) { 172 nmbjumbop = newnmbjumbop; 173 uma_zone_set_max(zone_jumbop, nmbjumbop); 174 } else 175 error = EINVAL; 176 } 177 return (error); 178 } 179 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW, 180 &nmbjumbop, 0, sysctl_nmbjumbop, "IU", 181 "Maximum number of mbuf page size jumbo clusters allowed"); 182 183 184 static int 185 sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS) 186 { 187 int error, newnmbjumbo9; 188 189 newnmbjumbo9 = nmbjumbo9; 190 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req); 191 if (error == 0 && req->newptr) { 192 if (newnmbjumbo9> nmbjumbo9) { 193 nmbjumbo9 = newnmbjumbo9; 194 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 195 } else 196 error = EINVAL; 197 } 198 return (error); 199 } 200 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW, 201 &nmbjumbo9, 0, sysctl_nmbjumbo9, "IU", 202 "Maximum number of mbuf 9k jumbo clusters allowed"); 203 204 static int 205 sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS) 206 { 207 int error, newnmbjumbo16; 208 209 newnmbjumbo16 = nmbjumbo16; 210 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req); 211 if (error == 0 && req->newptr) { 212 if (newnmbjumbo16> nmbjumbo16) { 213 nmbjumbo16 = newnmbjumbo16; 214 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 215 } else 216 error = EINVAL; 217 } 218 return (error); 219 } 220 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW, 221 &nmbjumbo16, 0, sysctl_nmbjumbo16, "IU", 222 "Maximum number of mbuf 16k jumbo clusters allowed"); 223 224 225 226 SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, 227 "Mbuf general information and statistics"); 228 229 /* 230 * Zones from which we allocate. 231 */ 232 uma_zone_t zone_mbuf; 233 uma_zone_t zone_clust; 234 uma_zone_t zone_pack; 235 uma_zone_t zone_jumbop; 236 uma_zone_t zone_jumbo9; 237 uma_zone_t zone_jumbo16; 238 uma_zone_t zone_ext_refcnt; 239 240 /* 241 * Local prototypes. 242 */ 243 static int mb_ctor_mbuf(void *, int, void *, int); 244 static int mb_ctor_clust(void *, int, void *, int); 245 static int mb_ctor_pack(void *, int, void *, int); 246 static void mb_dtor_mbuf(void *, int, void *); 247 static void mb_dtor_clust(void *, int, void *); 248 static void mb_dtor_pack(void *, int, void *); 249 static int mb_zinit_pack(void *, int, int); 250 static void mb_zfini_pack(void *, int); 251 252 static void mb_reclaim(void *); 253 static void mbuf_init(void *); 254 static void *mbuf_jumbo_alloc(uma_zone_t, int, uint8_t *, int); 255 256 /* Ensure that MSIZE must be a power of 2. */ 257 CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); 258 259 /* 260 * Initialize FreeBSD Network buffer allocation. 261 */ 262 SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL); 263 static void 264 mbuf_init(void *dummy) 265 { 266 267 /* 268 * Configure UMA zones for Mbufs, Clusters, and Packets. 269 */ 270 zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, 271 mb_ctor_mbuf, mb_dtor_mbuf, 272 #ifdef INVARIANTS 273 trash_init, trash_fini, 274 #else 275 NULL, NULL, 276 #endif 277 MSIZE - 1, UMA_ZONE_MAXBUCKET); 278 279 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, 280 mb_ctor_clust, mb_dtor_clust, 281 #ifdef INVARIANTS 282 trash_init, trash_fini, 283 #else 284 NULL, NULL, 285 #endif 286 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 287 if (nmbclusters > 0) 288 uma_zone_set_max(zone_clust, nmbclusters); 289 290 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, 291 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); 292 293 /* Make jumbo frame zone too. Page size, 9k and 16k. */ 294 zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE, 295 mb_ctor_clust, mb_dtor_clust, 296 #ifdef INVARIANTS 297 trash_init, trash_fini, 298 #else 299 NULL, NULL, 300 #endif 301 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 302 if (nmbjumbop > 0) 303 uma_zone_set_max(zone_jumbop, nmbjumbop); 304 305 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, 306 mb_ctor_clust, mb_dtor_clust, 307 #ifdef INVARIANTS 308 trash_init, trash_fini, 309 #else 310 NULL, NULL, 311 #endif 312 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 313 if (nmbjumbo9 > 0) 314 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 315 uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc); 316 317 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, 318 mb_ctor_clust, mb_dtor_clust, 319 #ifdef INVARIANTS 320 trash_init, trash_fini, 321 #else 322 NULL, NULL, 323 #endif 324 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 325 if (nmbjumbo16 > 0) 326 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 327 uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc); 328 329 zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int), 330 NULL, NULL, 331 NULL, NULL, 332 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 333 334 /* uma_prealloc() goes here... */ 335 336 /* 337 * Hook event handler for low-memory situation, used to 338 * drain protocols and push data back to the caches (UMA 339 * later pushes it back to VM). 340 */ 341 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL, 342 EVENTHANDLER_PRI_FIRST); 343 344 /* 345 * [Re]set counters and local statistics knobs. 346 * XXX Some of these should go and be replaced, but UMA stat 347 * gathering needs to be revised. 348 */ 349 mbstat.m_mbufs = 0; 350 mbstat.m_mclusts = 0; 351 mbstat.m_drain = 0; 352 mbstat.m_msize = MSIZE; 353 mbstat.m_mclbytes = MCLBYTES; 354 mbstat.m_minclsize = MINCLSIZE; 355 mbstat.m_mlen = MLEN; 356 mbstat.m_mhlen = MHLEN; 357 mbstat.m_numtypes = MT_NTYPES; 358 359 mbstat.m_mcfail = mbstat.m_mpfail = 0; 360 mbstat.sf_iocnt = 0; 361 mbstat.sf_allocwait = mbstat.sf_allocfail = 0; 362 } 363 364 /* 365 * UMA backend page allocator for the jumbo frame zones. 366 * 367 * Allocates kernel virtual memory that is backed by contiguous physical 368 * pages. 369 */ 370 static void * 371 mbuf_jumbo_alloc(uma_zone_t zone, int bytes, uint8_t *flags, int wait) 372 { 373 374 /* Inform UMA that this allocator uses kernel_map/object. */ 375 *flags = UMA_SLAB_KERNEL; 376 return ((void *)kmem_alloc_contig(kernel_map, bytes, wait, 377 (vm_paddr_t)0, ~(vm_paddr_t)0, 1, 0, VM_MEMATTR_DEFAULT)); 378 } 379 380 /* 381 * Constructor for Mbuf master zone. 382 * 383 * The 'arg' pointer points to a mb_args structure which 384 * contains call-specific information required to support the 385 * mbuf allocation API. See mbuf.h. 386 */ 387 static int 388 mb_ctor_mbuf(void *mem, int size, void *arg, int how) 389 { 390 struct mbuf *m; 391 struct mb_args *args; 392 #ifdef MAC 393 int error; 394 #endif 395 int flags; 396 short type; 397 398 #ifdef INVARIANTS 399 trash_ctor(mem, size, arg, how); 400 #endif 401 m = (struct mbuf *)mem; 402 args = (struct mb_args *)arg; 403 flags = args->flags; 404 type = args->type; 405 406 /* 407 * The mbuf is initialized later. The caller has the 408 * responsibility to set up any MAC labels too. 409 */ 410 if (type == MT_NOINIT) 411 return (0); 412 413 m->m_next = NULL; 414 m->m_nextpkt = NULL; 415 m->m_len = 0; 416 m->m_flags = flags; 417 m->m_type = type; 418 if (flags & M_PKTHDR) { 419 m->m_data = m->m_pktdat; 420 m->m_pkthdr.rcvif = NULL; 421 m->m_pkthdr.header = NULL; 422 m->m_pkthdr.len = 0; 423 m->m_pkthdr.csum_flags = 0; 424 m->m_pkthdr.csum_data = 0; 425 m->m_pkthdr.tso_segsz = 0; 426 m->m_pkthdr.ether_vtag = 0; 427 m->m_pkthdr.flowid = 0; 428 SLIST_INIT(&m->m_pkthdr.tags); 429 #ifdef MAC 430 /* If the label init fails, fail the alloc */ 431 error = mac_mbuf_init(m, how); 432 if (error) 433 return (error); 434 #endif 435 } else 436 m->m_data = m->m_dat; 437 return (0); 438 } 439 440 /* 441 * The Mbuf master zone destructor. 442 */ 443 static void 444 mb_dtor_mbuf(void *mem, int size, void *arg) 445 { 446 struct mbuf *m; 447 unsigned long flags; 448 449 m = (struct mbuf *)mem; 450 flags = (unsigned long)arg; 451 452 if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0) 453 m_tag_delete_chain(m, NULL); 454 KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__)); 455 KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__)); 456 #ifdef INVARIANTS 457 trash_dtor(mem, size, arg); 458 #endif 459 } 460 461 /* 462 * The Mbuf Packet zone destructor. 463 */ 464 static void 465 mb_dtor_pack(void *mem, int size, void *arg) 466 { 467 struct mbuf *m; 468 469 m = (struct mbuf *)mem; 470 if ((m->m_flags & M_PKTHDR) != 0) 471 m_tag_delete_chain(m, NULL); 472 473 /* Make sure we've got a clean cluster back. */ 474 KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__)); 475 KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__)); 476 KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__)); 477 KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__)); 478 KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__)); 479 KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__)); 480 KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__)); 481 KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__)); 482 #ifdef INVARIANTS 483 trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg); 484 #endif 485 /* 486 * If there are processes blocked on zone_clust, waiting for pages 487 * to be freed up, * cause them to be woken up by draining the 488 * packet zone. We are exposed to a race here * (in the check for 489 * the UMA_ZFLAG_FULL) where we might miss the flag set, but that 490 * is deliberate. We don't want to acquire the zone lock for every 491 * mbuf free. 492 */ 493 if (uma_zone_exhausted_nolock(zone_clust)) 494 zone_drain(zone_pack); 495 } 496 497 /* 498 * The Cluster and Jumbo[PAGESIZE|9|16] zone constructor. 499 * 500 * Here the 'arg' pointer points to the Mbuf which we 501 * are configuring cluster storage for. If 'arg' is 502 * empty we allocate just the cluster without setting 503 * the mbuf to it. See mbuf.h. 504 */ 505 static int 506 mb_ctor_clust(void *mem, int size, void *arg, int how) 507 { 508 struct mbuf *m; 509 u_int *refcnt; 510 int type; 511 uma_zone_t zone; 512 513 #ifdef INVARIANTS 514 trash_ctor(mem, size, arg, how); 515 #endif 516 switch (size) { 517 case MCLBYTES: 518 type = EXT_CLUSTER; 519 zone = zone_clust; 520 break; 521 #if MJUMPAGESIZE != MCLBYTES 522 case MJUMPAGESIZE: 523 type = EXT_JUMBOP; 524 zone = zone_jumbop; 525 break; 526 #endif 527 case MJUM9BYTES: 528 type = EXT_JUMBO9; 529 zone = zone_jumbo9; 530 break; 531 case MJUM16BYTES: 532 type = EXT_JUMBO16; 533 zone = zone_jumbo16; 534 break; 535 default: 536 panic("unknown cluster size"); 537 break; 538 } 539 540 m = (struct mbuf *)arg; 541 refcnt = uma_find_refcnt(zone, mem); 542 *refcnt = 1; 543 if (m != NULL) { 544 m->m_ext.ext_buf = (caddr_t)mem; 545 m->m_data = m->m_ext.ext_buf; 546 m->m_flags |= M_EXT; 547 m->m_ext.ext_free = NULL; 548 m->m_ext.ext_arg1 = NULL; 549 m->m_ext.ext_arg2 = NULL; 550 m->m_ext.ext_size = size; 551 m->m_ext.ext_type = type; 552 m->m_ext.ref_cnt = refcnt; 553 } 554 555 return (0); 556 } 557 558 /* 559 * The Mbuf Cluster zone destructor. 560 */ 561 static void 562 mb_dtor_clust(void *mem, int size, void *arg) 563 { 564 #ifdef INVARIANTS 565 uma_zone_t zone; 566 567 zone = m_getzone(size); 568 KASSERT(*(uma_find_refcnt(zone, mem)) <= 1, 569 ("%s: refcnt incorrect %u", __func__, 570 *(uma_find_refcnt(zone, mem))) ); 571 572 trash_dtor(mem, size, arg); 573 #endif 574 } 575 576 /* 577 * The Packet secondary zone's init routine, executed on the 578 * object's transition from mbuf keg slab to zone cache. 579 */ 580 static int 581 mb_zinit_pack(void *mem, int size, int how) 582 { 583 struct mbuf *m; 584 585 m = (struct mbuf *)mem; /* m is virgin. */ 586 if (uma_zalloc_arg(zone_clust, m, how) == NULL || 587 m->m_ext.ext_buf == NULL) 588 return (ENOMEM); 589 m->m_ext.ext_type = EXT_PACKET; /* Override. */ 590 #ifdef INVARIANTS 591 trash_init(m->m_ext.ext_buf, MCLBYTES, how); 592 #endif 593 return (0); 594 } 595 596 /* 597 * The Packet secondary zone's fini routine, executed on the 598 * object's transition from zone cache to keg slab. 599 */ 600 static void 601 mb_zfini_pack(void *mem, int size) 602 { 603 struct mbuf *m; 604 605 m = (struct mbuf *)mem; 606 #ifdef INVARIANTS 607 trash_fini(m->m_ext.ext_buf, MCLBYTES); 608 #endif 609 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL); 610 #ifdef INVARIANTS 611 trash_dtor(mem, size, NULL); 612 #endif 613 } 614 615 /* 616 * The "packet" keg constructor. 617 */ 618 static int 619 mb_ctor_pack(void *mem, int size, void *arg, int how) 620 { 621 struct mbuf *m; 622 struct mb_args *args; 623 #ifdef MAC 624 int error; 625 #endif 626 int flags; 627 short type; 628 629 m = (struct mbuf *)mem; 630 args = (struct mb_args *)arg; 631 flags = args->flags; 632 type = args->type; 633 634 #ifdef INVARIANTS 635 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how); 636 #endif 637 m->m_next = NULL; 638 m->m_nextpkt = NULL; 639 m->m_data = m->m_ext.ext_buf; 640 m->m_len = 0; 641 m->m_flags = (flags | M_EXT); 642 m->m_type = type; 643 644 if (flags & M_PKTHDR) { 645 m->m_pkthdr.rcvif = NULL; 646 m->m_pkthdr.len = 0; 647 m->m_pkthdr.header = NULL; 648 m->m_pkthdr.csum_flags = 0; 649 m->m_pkthdr.csum_data = 0; 650 m->m_pkthdr.tso_segsz = 0; 651 m->m_pkthdr.ether_vtag = 0; 652 m->m_pkthdr.flowid = 0; 653 SLIST_INIT(&m->m_pkthdr.tags); 654 #ifdef MAC 655 /* If the label init fails, fail the alloc */ 656 error = mac_mbuf_init(m, how); 657 if (error) 658 return (error); 659 #endif 660 } 661 /* m_ext is already initialized. */ 662 663 return (0); 664 } 665 666 int 667 m_pkthdr_init(struct mbuf *m, int how) 668 { 669 #ifdef MAC 670 int error; 671 #endif 672 m->m_data = m->m_pktdat; 673 SLIST_INIT(&m->m_pkthdr.tags); 674 m->m_pkthdr.rcvif = NULL; 675 m->m_pkthdr.header = NULL; 676 m->m_pkthdr.len = 0; 677 m->m_pkthdr.flowid = 0; 678 m->m_pkthdr.csum_flags = 0; 679 m->m_pkthdr.csum_data = 0; 680 m->m_pkthdr.tso_segsz = 0; 681 m->m_pkthdr.ether_vtag = 0; 682 #ifdef MAC 683 /* If the label init fails, fail the alloc */ 684 error = mac_mbuf_init(m, how); 685 if (error) 686 return (error); 687 #endif 688 689 return (0); 690 } 691 692 /* 693 * This is the protocol drain routine. 694 * 695 * No locks should be held when this is called. The drain routines have to 696 * presently acquire some locks which raises the possibility of lock order 697 * reversal. 698 */ 699 static void 700 mb_reclaim(void *junk) 701 { 702 struct domain *dp; 703 struct protosw *pr; 704 705 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, 706 "mb_reclaim()"); 707 708 for (dp = domains; dp != NULL; dp = dp->dom_next) 709 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 710 if (pr->pr_drain != NULL) 711 (*pr->pr_drain)(); 712 } 713