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