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_page.h> 48 #include <vm/uma.h> 49 #include <vm/uma_int.h> 50 #include <vm/uma_dbg.h> 51 52 /* 53 * In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA 54 * Zones. 55 * 56 * Mbuf Clusters (2K, contiguous) are allocated from the Cluster 57 * Zone. The Zone can be capped at kern.ipc.nmbclusters, if the 58 * administrator so desires. 59 * 60 * Mbufs are allocated from a UMA Master Zone called the Mbuf 61 * Zone. 62 * 63 * Additionally, FreeBSD provides a Packet Zone, which it 64 * configures as a Secondary Zone to the Mbuf Master Zone, 65 * thus sharing backend Slab kegs with the Mbuf Master Zone. 66 * 67 * Thus common-case allocations and locking are simplified: 68 * 69 * m_clget() m_getcl() 70 * | | 71 * | .------------>[(Packet Cache)] m_get(), m_gethdr() 72 * | | [ Packet ] | 73 * [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ] 74 * [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ] 75 * | \________ | 76 * [ Cluster Keg ] \ / 77 * | [ Mbuf Keg ] 78 * [ Cluster Slabs ] | 79 * | [ Mbuf Slabs ] 80 * \____________(VM)_________________/ 81 * 82 * 83 * Whenever an object is allocated with uma_zalloc() out of 84 * one of the Zones its _ctor_ function is executed. The same 85 * for any deallocation through uma_zfree() the _dtor_ function 86 * is executed. 87 * 88 * Caches are per-CPU and are filled from the Master Zone. 89 * 90 * Whenever an object is allocated from the underlying global 91 * memory pool it gets pre-initialized with the _zinit_ functions. 92 * When the Keg's are overfull objects get decomissioned with 93 * _zfini_ functions and free'd back to the global memory pool. 94 * 95 */ 96 97 int nmbclusters; /* limits number of mbuf clusters */ 98 int nmbjumbop; /* limits number of page size jumbo clusters */ 99 int nmbjumbo9; /* limits number of 9k jumbo clusters */ 100 int nmbjumbo16; /* limits number of 16k jumbo clusters */ 101 struct mbstat mbstat; 102 103 /* 104 * tunable_mbinit() has to be run before init_maxsockets() thus 105 * the SYSINIT order below is SI_ORDER_MIDDLE while init_maxsockets() 106 * runs at SI_ORDER_ANY. 107 */ 108 static void 109 tunable_mbinit(void *dummy) 110 { 111 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters); 112 113 /* This has to be done before VM init. */ 114 if (nmbclusters == 0) 115 nmbclusters = 1024 + maxusers * 64; 116 nmbjumbop = nmbclusters / 2; 117 nmbjumbo9 = nmbjumbop / 2; 118 nmbjumbo16 = nmbjumbo9 / 2; 119 } 120 SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_mbinit, NULL); 121 122 static int 123 sysctl_nmbclusters(SYSCTL_HANDLER_ARGS) 124 { 125 int error, newnmbclusters; 126 127 newnmbclusters = nmbclusters; 128 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 129 if (error == 0 && req->newptr) { 130 if (newnmbclusters > nmbclusters) { 131 nmbclusters = newnmbclusters; 132 uma_zone_set_max(zone_clust, nmbclusters); 133 EVENTHANDLER_INVOKE(nmbclusters_change); 134 } else 135 error = EINVAL; 136 } 137 return (error); 138 } 139 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW, 140 &nmbclusters, 0, sysctl_nmbclusters, "IU", 141 "Maximum number of mbuf clusters allowed"); 142 143 static int 144 sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS) 145 { 146 int error, newnmbjumbop; 147 148 newnmbjumbop = nmbjumbop; 149 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req); 150 if (error == 0 && req->newptr) { 151 if (newnmbjumbop> nmbjumbop) { 152 nmbjumbop = newnmbjumbop; 153 uma_zone_set_max(zone_jumbop, nmbjumbop); 154 } else 155 error = EINVAL; 156 } 157 return (error); 158 } 159 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW, 160 &nmbjumbop, 0, sysctl_nmbjumbop, "IU", 161 "Maximum number of mbuf page size jumbo clusters allowed"); 162 163 164 static int 165 sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS) 166 { 167 int error, newnmbjumbo9; 168 169 newnmbjumbo9 = nmbjumbo9; 170 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req); 171 if (error == 0 && req->newptr) { 172 if (newnmbjumbo9> nmbjumbo9) { 173 nmbjumbo9 = newnmbjumbo9; 174 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 175 } else 176 error = EINVAL; 177 } 178 return (error); 179 } 180 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW, 181 &nmbjumbo9, 0, sysctl_nmbjumbo9, "IU", 182 "Maximum number of mbuf 9k jumbo clusters allowed"); 183 184 static int 185 sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS) 186 { 187 int error, newnmbjumbo16; 188 189 newnmbjumbo16 = nmbjumbo16; 190 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req); 191 if (error == 0 && req->newptr) { 192 if (newnmbjumbo16> nmbjumbo16) { 193 nmbjumbo16 = newnmbjumbo16; 194 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 195 } else 196 error = EINVAL; 197 } 198 return (error); 199 } 200 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW, 201 &nmbjumbo16, 0, sysctl_nmbjumbo16, "IU", 202 "Maximum number of mbuf 16k jumbo clusters allowed"); 203 204 205 206 SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, 207 "Mbuf general information and statistics"); 208 209 /* 210 * Zones from which we allocate. 211 */ 212 uma_zone_t zone_mbuf; 213 uma_zone_t zone_clust; 214 uma_zone_t zone_pack; 215 uma_zone_t zone_jumbop; 216 uma_zone_t zone_jumbo9; 217 uma_zone_t zone_jumbo16; 218 uma_zone_t zone_ext_refcnt; 219 220 /* 221 * Local prototypes. 222 */ 223 static int mb_ctor_mbuf(void *, int, void *, int); 224 static int mb_ctor_clust(void *, int, void *, int); 225 static int mb_ctor_pack(void *, int, void *, int); 226 static void mb_dtor_mbuf(void *, int, void *); 227 static void mb_dtor_clust(void *, int, void *); 228 static void mb_dtor_pack(void *, int, void *); 229 static int mb_zinit_pack(void *, int, int); 230 static void mb_zfini_pack(void *, int); 231 232 static void mb_reclaim(void *); 233 static void mbuf_init(void *); 234 static void *mbuf_jumbo_alloc(uma_zone_t, int, u_int8_t *, int); 235 static void mbuf_jumbo_free(void *, int, u_int8_t); 236 237 static MALLOC_DEFINE(M_JUMBOFRAME, "jumboframes", "mbuf jumbo frame buffers"); 238 239 /* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */ 240 CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); 241 242 /* 243 * Initialize FreeBSD Network buffer allocation. 244 */ 245 SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL); 246 static void 247 mbuf_init(void *dummy) 248 { 249 250 /* 251 * Configure UMA zones for Mbufs, Clusters, and Packets. 252 */ 253 zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, 254 mb_ctor_mbuf, mb_dtor_mbuf, 255 #ifdef INVARIANTS 256 trash_init, trash_fini, 257 #else 258 NULL, NULL, 259 #endif 260 MSIZE - 1, UMA_ZONE_MAXBUCKET); 261 262 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, 263 mb_ctor_clust, mb_dtor_clust, 264 #ifdef INVARIANTS 265 trash_init, trash_fini, 266 #else 267 NULL, NULL, 268 #endif 269 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 270 if (nmbclusters > 0) 271 uma_zone_set_max(zone_clust, nmbclusters); 272 273 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, 274 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); 275 276 /* Make jumbo frame zone too. Page size, 9k and 16k. */ 277 zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE, 278 mb_ctor_clust, mb_dtor_clust, 279 #ifdef INVARIANTS 280 trash_init, trash_fini, 281 #else 282 NULL, NULL, 283 #endif 284 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 285 if (nmbjumbop > 0) 286 uma_zone_set_max(zone_jumbop, nmbjumbop); 287 288 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, 289 mb_ctor_clust, mb_dtor_clust, 290 #ifdef INVARIANTS 291 trash_init, trash_fini, 292 #else 293 NULL, NULL, 294 #endif 295 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 296 if (nmbjumbo9 > 0) 297 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 298 uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc); 299 uma_zone_set_freef(zone_jumbo9, mbuf_jumbo_free); 300 301 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, 302 mb_ctor_clust, mb_dtor_clust, 303 #ifdef INVARIANTS 304 trash_init, trash_fini, 305 #else 306 NULL, NULL, 307 #endif 308 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 309 if (nmbjumbo16 > 0) 310 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 311 uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc); 312 uma_zone_set_freef(zone_jumbo16, mbuf_jumbo_free); 313 314 zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int), 315 NULL, NULL, 316 NULL, NULL, 317 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 318 319 /* uma_prealloc() goes here... */ 320 321 /* 322 * Hook event handler for low-memory situation, used to 323 * drain protocols and push data back to the caches (UMA 324 * later pushes it back to VM). 325 */ 326 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL, 327 EVENTHANDLER_PRI_FIRST); 328 329 /* 330 * [Re]set counters and local statistics knobs. 331 * XXX Some of these should go and be replaced, but UMA stat 332 * gathering needs to be revised. 333 */ 334 mbstat.m_mbufs = 0; 335 mbstat.m_mclusts = 0; 336 mbstat.m_drain = 0; 337 mbstat.m_msize = MSIZE; 338 mbstat.m_mclbytes = MCLBYTES; 339 mbstat.m_minclsize = MINCLSIZE; 340 mbstat.m_mlen = MLEN; 341 mbstat.m_mhlen = MHLEN; 342 mbstat.m_numtypes = MT_NTYPES; 343 344 mbstat.m_mcfail = mbstat.m_mpfail = 0; 345 mbstat.sf_iocnt = 0; 346 mbstat.sf_allocwait = mbstat.sf_allocfail = 0; 347 } 348 349 /* 350 * UMA backend page allocator for the jumbo frame zones. 351 * 352 * Allocates kernel virtual memory that is backed by contiguous physical 353 * pages. 354 */ 355 static void * 356 mbuf_jumbo_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait) 357 { 358 359 /* Inform UMA that this allocator uses kernel_map/object. */ 360 *flags = UMA_SLAB_KERNEL; 361 return (contigmalloc(bytes, M_JUMBOFRAME, wait, (vm_paddr_t)0, 362 ~(vm_paddr_t)0, 1, 0)); 363 } 364 365 /* 366 * UMA backend page deallocator for the jumbo frame zones. 367 */ 368 static void 369 mbuf_jumbo_free(void *mem, int size, u_int8_t flags) 370 { 371 372 contigfree(mem, size, M_JUMBOFRAME); 373 } 374 375 /* 376 * Constructor for Mbuf master zone. 377 * 378 * The 'arg' pointer points to a mb_args structure which 379 * contains call-specific information required to support the 380 * mbuf allocation API. See mbuf.h. 381 */ 382 static int 383 mb_ctor_mbuf(void *mem, int size, void *arg, int how) 384 { 385 struct mbuf *m; 386 struct mb_args *args; 387 #ifdef MAC 388 int error; 389 #endif 390 int flags; 391 short type; 392 393 #ifdef INVARIANTS 394 trash_ctor(mem, size, arg, how); 395 #endif 396 m = (struct mbuf *)mem; 397 args = (struct mb_args *)arg; 398 flags = args->flags; 399 type = args->type; 400 401 /* 402 * The mbuf is initialized later. The caller has the 403 * responsibility to set up any MAC labels too. 404 */ 405 if (type == MT_NOINIT) 406 return (0); 407 408 m->m_next = NULL; 409 m->m_nextpkt = NULL; 410 m->m_len = 0; 411 m->m_flags = flags; 412 m->m_type = type; 413 if (flags & M_PKTHDR) { 414 m->m_data = m->m_pktdat; 415 m->m_pkthdr.rcvif = NULL; 416 m->m_pkthdr.header = NULL; 417 m->m_pkthdr.len = 0; 418 m->m_pkthdr.csum_flags = 0; 419 m->m_pkthdr.csum_data = 0; 420 m->m_pkthdr.tso_segsz = 0; 421 m->m_pkthdr.ether_vtag = 0; 422 m->m_pkthdr.flowid = 0; 423 SLIST_INIT(&m->m_pkthdr.tags); 424 #ifdef MAC 425 /* If the label init fails, fail the alloc */ 426 error = mac_mbuf_init(m, how); 427 if (error) 428 return (error); 429 #endif 430 } else 431 m->m_data = m->m_dat; 432 return (0); 433 } 434 435 /* 436 * The Mbuf master zone destructor. 437 */ 438 static void 439 mb_dtor_mbuf(void *mem, int size, void *arg) 440 { 441 struct mbuf *m; 442 unsigned long flags; 443 444 m = (struct mbuf *)mem; 445 flags = (unsigned long)arg; 446 447 if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0) 448 m_tag_delete_chain(m, NULL); 449 KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__)); 450 KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__)); 451 #ifdef INVARIANTS 452 trash_dtor(mem, size, arg); 453 #endif 454 } 455 456 /* 457 * The Mbuf Packet zone destructor. 458 */ 459 static void 460 mb_dtor_pack(void *mem, int size, void *arg) 461 { 462 struct mbuf *m; 463 464 m = (struct mbuf *)mem; 465 if ((m->m_flags & M_PKTHDR) != 0) 466 m_tag_delete_chain(m, NULL); 467 468 /* Make sure we've got a clean cluster back. */ 469 KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__)); 470 KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__)); 471 KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__)); 472 KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__)); 473 KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__)); 474 KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__)); 475 KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__)); 476 KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__)); 477 #ifdef INVARIANTS 478 trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg); 479 #endif 480 /* 481 * If there are processes blocked on zone_clust, waiting for pages 482 * to be freed up, * cause them to be woken up by draining the 483 * packet zone. We are exposed to a race here * (in the check for 484 * the UMA_ZFLAG_FULL) where we might miss the flag set, but that 485 * is deliberate. We don't want to acquire the zone lock for every 486 * mbuf free. 487 */ 488 if (uma_zone_exhausted_nolock(zone_clust)) 489 zone_drain(zone_pack); 490 } 491 492 /* 493 * The Cluster and Jumbo[PAGESIZE|9|16] zone constructor. 494 * 495 * Here the 'arg' pointer points to the Mbuf which we 496 * are configuring cluster storage for. If 'arg' is 497 * empty we allocate just the cluster without setting 498 * the mbuf to it. See mbuf.h. 499 */ 500 static int 501 mb_ctor_clust(void *mem, int size, void *arg, int how) 502 { 503 struct mbuf *m; 504 u_int *refcnt; 505 int type; 506 uma_zone_t zone; 507 508 #ifdef INVARIANTS 509 trash_ctor(mem, size, arg, how); 510 #endif 511 switch (size) { 512 case MCLBYTES: 513 type = EXT_CLUSTER; 514 zone = zone_clust; 515 break; 516 #if MJUMPAGESIZE != MCLBYTES 517 case MJUMPAGESIZE: 518 type = EXT_JUMBOP; 519 zone = zone_jumbop; 520 break; 521 #endif 522 case MJUM9BYTES: 523 type = EXT_JUMBO9; 524 zone = zone_jumbo9; 525 break; 526 case MJUM16BYTES: 527 type = EXT_JUMBO16; 528 zone = zone_jumbo16; 529 break; 530 default: 531 panic("unknown cluster size"); 532 break; 533 } 534 535 m = (struct mbuf *)arg; 536 refcnt = uma_find_refcnt(zone, mem); 537 *refcnt = 1; 538 if (m != NULL) { 539 m->m_ext.ext_buf = (caddr_t)mem; 540 m->m_data = m->m_ext.ext_buf; 541 m->m_flags |= M_EXT; 542 m->m_ext.ext_free = NULL; 543 m->m_ext.ext_arg1 = NULL; 544 m->m_ext.ext_arg2 = NULL; 545 m->m_ext.ext_size = size; 546 m->m_ext.ext_type = type; 547 m->m_ext.ref_cnt = refcnt; 548 } 549 550 return (0); 551 } 552 553 /* 554 * The Mbuf Cluster zone destructor. 555 */ 556 static void 557 mb_dtor_clust(void *mem, int size, void *arg) 558 { 559 #ifdef INVARIANTS 560 uma_zone_t zone; 561 562 zone = m_getzone(size); 563 KASSERT(*(uma_find_refcnt(zone, mem)) <= 1, 564 ("%s: refcnt incorrect %u", __func__, 565 *(uma_find_refcnt(zone, mem))) ); 566 567 trash_dtor(mem, size, arg); 568 #endif 569 } 570 571 /* 572 * The Packet secondary zone's init routine, executed on the 573 * object's transition from mbuf keg slab to zone cache. 574 */ 575 static int 576 mb_zinit_pack(void *mem, int size, int how) 577 { 578 struct mbuf *m; 579 580 m = (struct mbuf *)mem; /* m is virgin. */ 581 if (uma_zalloc_arg(zone_clust, m, how) == NULL || 582 m->m_ext.ext_buf == NULL) 583 return (ENOMEM); 584 m->m_ext.ext_type = EXT_PACKET; /* Override. */ 585 #ifdef INVARIANTS 586 trash_init(m->m_ext.ext_buf, MCLBYTES, how); 587 #endif 588 return (0); 589 } 590 591 /* 592 * The Packet secondary zone's fini routine, executed on the 593 * object's transition from zone cache to keg slab. 594 */ 595 static void 596 mb_zfini_pack(void *mem, int size) 597 { 598 struct mbuf *m; 599 600 m = (struct mbuf *)mem; 601 #ifdef INVARIANTS 602 trash_fini(m->m_ext.ext_buf, MCLBYTES); 603 #endif 604 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL); 605 #ifdef INVARIANTS 606 trash_dtor(mem, size, NULL); 607 #endif 608 } 609 610 /* 611 * The "packet" keg constructor. 612 */ 613 static int 614 mb_ctor_pack(void *mem, int size, void *arg, int how) 615 { 616 struct mbuf *m; 617 struct mb_args *args; 618 #ifdef MAC 619 int error; 620 #endif 621 int flags; 622 short type; 623 624 m = (struct mbuf *)mem; 625 args = (struct mb_args *)arg; 626 flags = args->flags; 627 type = args->type; 628 629 #ifdef INVARIANTS 630 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how); 631 #endif 632 m->m_next = NULL; 633 m->m_nextpkt = NULL; 634 m->m_data = m->m_ext.ext_buf; 635 m->m_len = 0; 636 m->m_flags = (flags | M_EXT); 637 m->m_type = type; 638 639 if (flags & M_PKTHDR) { 640 m->m_pkthdr.rcvif = NULL; 641 m->m_pkthdr.len = 0; 642 m->m_pkthdr.header = NULL; 643 m->m_pkthdr.csum_flags = 0; 644 m->m_pkthdr.csum_data = 0; 645 m->m_pkthdr.tso_segsz = 0; 646 m->m_pkthdr.ether_vtag = 0; 647 m->m_pkthdr.flowid = 0; 648 SLIST_INIT(&m->m_pkthdr.tags); 649 #ifdef MAC 650 /* If the label init fails, fail the alloc */ 651 error = mac_mbuf_init(m, how); 652 if (error) 653 return (error); 654 #endif 655 } 656 /* m_ext is already initialized. */ 657 658 return (0); 659 } 660 661 /* 662 * This is the protocol drain routine. 663 * 664 * No locks should be held when this is called. The drain routines have to 665 * presently acquire some locks which raises the possibility of lock order 666 * reversal. 667 */ 668 static void 669 mb_reclaim(void *junk) 670 { 671 struct domain *dp; 672 struct protosw *pr; 673 674 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, 675 "mb_reclaim()"); 676 677 for (dp = domains; dp != NULL; dp = dp->dom_next) 678 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 679 if (pr->pr_drain != NULL) 680 (*pr->pr_drain)(); 681 } 682