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_mac.h" 32 #include "opt_param.h" 33 34 #include <sys/param.h> 35 #include <sys/malloc.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/domain.h> 39 #include <sys/eventhandler.h> 40 #include <sys/kernel.h> 41 #include <sys/protosw.h> 42 #include <sys/smp.h> 43 #include <sys/sysctl.h> 44 45 #include <security/mac/mac_framework.h> 46 47 #include <vm/vm.h> 48 #include <vm/vm_page.h> 49 #include <vm/uma.h> 50 #include <vm/uma_int.h> 51 #include <vm/uma_dbg.h> 52 53 /* 54 * In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA 55 * Zones. 56 * 57 * Mbuf Clusters (2K, contiguous) are allocated from the Cluster 58 * Zone. The Zone can be capped at kern.ipc.nmbclusters, if the 59 * administrator so desires. 60 * 61 * Mbufs are allocated from a UMA Master Zone called the Mbuf 62 * Zone. 63 * 64 * Additionally, FreeBSD provides a Packet Zone, which it 65 * configures as a Secondary Zone to the Mbuf Master Zone, 66 * thus sharing backend Slab kegs with the Mbuf Master Zone. 67 * 68 * Thus common-case allocations and locking are simplified: 69 * 70 * m_clget() m_getcl() 71 * | | 72 * | .------------>[(Packet Cache)] m_get(), m_gethdr() 73 * | | [ Packet ] | 74 * [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ] 75 * [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ] 76 * | \________ | 77 * [ Cluster Keg ] \ / 78 * | [ Mbuf Keg ] 79 * [ Cluster Slabs ] | 80 * | [ Mbuf Slabs ] 81 * \____________(VM)_________________/ 82 * 83 * 84 * Whenever an object is allocated with uma_zalloc() out of 85 * one of the Zones its _ctor_ function is executed. The same 86 * for any deallocation through uma_zfree() the _dtor_ function 87 * is executed. 88 * 89 * Caches are per-CPU and are filled from the Master Zone. 90 * 91 * Whenever an object is allocated from the underlying global 92 * memory pool it gets pre-initialized with the _zinit_ functions. 93 * When the Keg's are overfull objects get decomissioned with 94 * _zfini_ functions and free'd back to the global memory pool. 95 * 96 */ 97 98 int nmbclusters; /* limits number of mbuf clusters */ 99 int nmbjumbop; /* limits number of page size jumbo clusters */ 100 int nmbjumbo9; /* limits number of 9k jumbo clusters */ 101 int nmbjumbo16; /* limits number of 16k jumbo clusters */ 102 struct mbstat mbstat; 103 104 static void 105 tunable_mbinit(void *dummy) 106 { 107 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters); 108 109 /* This has to be done before VM init. */ 110 if (nmbclusters == 0) 111 nmbclusters = 1024 + maxusers * 64; 112 nmbjumbop = nmbclusters / 2; 113 nmbjumbo9 = nmbjumbop / 2; 114 nmbjumbo16 = nmbjumbo9 / 2; 115 } 116 SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_ANY, tunable_mbinit, NULL); 117 118 /* XXX: These should be tuneables. Can't change UMA limits on the fly. */ 119 static int 120 sysctl_nmbclusters(SYSCTL_HANDLER_ARGS) 121 { 122 int error, newnmbclusters; 123 124 newnmbclusters = nmbclusters; 125 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 126 if (error == 0 && req->newptr) { 127 if (newnmbclusters > nmbclusters) { 128 nmbclusters = newnmbclusters; 129 uma_zone_set_max(zone_clust, nmbclusters); 130 EVENTHANDLER_INVOKE(nmbclusters_change); 131 } else 132 error = EINVAL; 133 } 134 return (error); 135 } 136 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW, 137 &nmbclusters, 0, sysctl_nmbclusters, "IU", 138 "Maximum number of mbuf clusters allowed"); 139 140 static int 141 sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS) 142 { 143 int error, newnmbjumbop; 144 145 newnmbjumbop = nmbjumbop; 146 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req); 147 if (error == 0 && req->newptr) { 148 if (newnmbjumbop> nmbjumbop) { 149 nmbjumbop = newnmbjumbop; 150 uma_zone_set_max(zone_jumbop, nmbjumbop); 151 } else 152 error = EINVAL; 153 } 154 return (error); 155 } 156 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW, 157 &nmbjumbop, 0, sysctl_nmbjumbop, "IU", 158 "Maximum number of mbuf page size jumbo clusters allowed"); 159 160 161 static int 162 sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS) 163 { 164 int error, newnmbjumbo9; 165 166 newnmbjumbo9 = nmbjumbo9; 167 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req); 168 if (error == 0 && req->newptr) { 169 if (newnmbjumbo9> nmbjumbo9) { 170 nmbjumbo9 = newnmbjumbo9; 171 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 172 } else 173 error = EINVAL; 174 } 175 return (error); 176 } 177 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW, 178 &nmbjumbo9, 0, sysctl_nmbjumbo9, "IU", 179 "Maximum number of mbuf 9k jumbo clusters allowed"); 180 181 static int 182 sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS) 183 { 184 int error, newnmbjumbo16; 185 186 newnmbjumbo16 = nmbjumbo16; 187 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req); 188 if (error == 0 && req->newptr) { 189 if (newnmbjumbo16> nmbjumbo16) { 190 nmbjumbo16 = newnmbjumbo16; 191 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 192 } else 193 error = EINVAL; 194 } 195 return (error); 196 } 197 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW, 198 &nmbjumbo16, 0, sysctl_nmbjumbo16, "IU", 199 "Maximum number of mbuf 16k jumbo clusters allowed"); 200 201 202 203 SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, 204 "Mbuf general information and statistics"); 205 206 /* 207 * Zones from which we allocate. 208 */ 209 uma_zone_t zone_mbuf; 210 uma_zone_t zone_clust; 211 uma_zone_t zone_pack; 212 uma_zone_t zone_jumbop; 213 uma_zone_t zone_jumbo9; 214 uma_zone_t zone_jumbo16; 215 uma_zone_t zone_ext_refcnt; 216 217 /* 218 * Local prototypes. 219 */ 220 static int mb_ctor_mbuf(void *, int, void *, int); 221 static int mb_ctor_clust(void *, int, void *, int); 222 static int mb_ctor_pack(void *, int, void *, int); 223 static void mb_dtor_mbuf(void *, int, void *); 224 static void mb_dtor_clust(void *, int, void *); 225 static void mb_dtor_pack(void *, int, void *); 226 static int mb_zinit_pack(void *, int, int); 227 static void mb_zfini_pack(void *, int); 228 229 static void mb_reclaim(void *); 230 static void mbuf_init(void *); 231 static void *mbuf_jumbo_alloc(uma_zone_t, int, u_int8_t *, int); 232 static void mbuf_jumbo_free(void *, int, u_int8_t); 233 234 static MALLOC_DEFINE(M_JUMBOFRAME, "jumboframes", "mbuf jumbo frame buffers"); 235 236 /* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */ 237 CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); 238 239 /* 240 * Initialize FreeBSD Network buffer allocation. 241 */ 242 SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL); 243 static void 244 mbuf_init(void *dummy) 245 { 246 247 /* 248 * Configure UMA zones for Mbufs, Clusters, and Packets. 249 */ 250 zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, 251 mb_ctor_mbuf, mb_dtor_mbuf, 252 #ifdef INVARIANTS 253 trash_init, trash_fini, 254 #else 255 NULL, NULL, 256 #endif 257 MSIZE - 1, UMA_ZONE_MAXBUCKET); 258 259 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, 260 mb_ctor_clust, mb_dtor_clust, 261 #ifdef INVARIANTS 262 trash_init, trash_fini, 263 #else 264 NULL, NULL, 265 #endif 266 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 267 if (nmbclusters > 0) 268 uma_zone_set_max(zone_clust, nmbclusters); 269 270 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, 271 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); 272 273 /* Make jumbo frame zone too. Page size, 9k and 16k. */ 274 zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE, 275 mb_ctor_clust, mb_dtor_clust, 276 #ifdef INVARIANTS 277 trash_init, trash_fini, 278 #else 279 NULL, NULL, 280 #endif 281 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 282 if (nmbjumbop > 0) 283 uma_zone_set_max(zone_jumbop, nmbjumbop); 284 285 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, 286 mb_ctor_clust, mb_dtor_clust, 287 #ifdef INVARIANTS 288 trash_init, trash_fini, 289 #else 290 NULL, NULL, 291 #endif 292 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 293 if (nmbjumbo9 > 0) 294 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 295 uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc); 296 uma_zone_set_freef(zone_jumbo9, mbuf_jumbo_free); 297 298 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, 299 mb_ctor_clust, mb_dtor_clust, 300 #ifdef INVARIANTS 301 trash_init, trash_fini, 302 #else 303 NULL, NULL, 304 #endif 305 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 306 if (nmbjumbo16 > 0) 307 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 308 uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc); 309 uma_zone_set_freef(zone_jumbo16, mbuf_jumbo_free); 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, u_int8_t *flags, int wait) 354 { 355 356 /* Inform UMA that this allocator uses kernel_map/object. */ 357 *flags = UMA_SLAB_KERNEL; 358 return (contigmalloc(bytes, M_JUMBOFRAME, wait, (vm_paddr_t)0, 359 ~(vm_paddr_t)0, 1, 0)); 360 } 361 362 /* 363 * UMA backend page deallocator for the jumbo frame zones. 364 */ 365 static void 366 mbuf_jumbo_free(void *mem, int size, u_int8_t flags) 367 { 368 369 contigfree(mem, size, M_JUMBOFRAME); 370 } 371 372 /* 373 * Constructor for Mbuf master zone. 374 * 375 * The 'arg' pointer points to a mb_args structure which 376 * contains call-specific information required to support the 377 * mbuf allocation API. See mbuf.h. 378 */ 379 static int 380 mb_ctor_mbuf(void *mem, int size, void *arg, int how) 381 { 382 struct mbuf *m; 383 struct mb_args *args; 384 #ifdef MAC 385 int error; 386 #endif 387 int flags; 388 short type; 389 390 #ifdef INVARIANTS 391 trash_ctor(mem, size, arg, how); 392 #endif 393 m = (struct mbuf *)mem; 394 args = (struct mb_args *)arg; 395 flags = args->flags; 396 type = args->type; 397 398 /* 399 * The mbuf is initialized later. The caller has the 400 * responsibility to set up any MAC labels too. 401 */ 402 if (type == MT_NOINIT) 403 return (0); 404 405 m->m_next = NULL; 406 m->m_nextpkt = NULL; 407 m->m_len = 0; 408 m->m_flags = flags; 409 m->m_type = type; 410 if (flags & M_PKTHDR) { 411 m->m_data = m->m_pktdat; 412 m->m_pkthdr.rcvif = NULL; 413 m->m_pkthdr.header = NULL; 414 m->m_pkthdr.len = 0; 415 m->m_pkthdr.csum_flags = 0; 416 m->m_pkthdr.csum_data = 0; 417 m->m_pkthdr.tso_segsz = 0; 418 m->m_pkthdr.ether_vtag = 0; 419 SLIST_INIT(&m->m_pkthdr.tags); 420 #ifdef MAC 421 /* If the label init fails, fail the alloc */ 422 error = mac_mbuf_init(m, how); 423 if (error) 424 return (error); 425 #endif 426 } else 427 m->m_data = m->m_dat; 428 return (0); 429 } 430 431 /* 432 * The Mbuf master zone destructor. 433 */ 434 static void 435 mb_dtor_mbuf(void *mem, int size, void *arg) 436 { 437 struct mbuf *m; 438 unsigned long flags; 439 440 m = (struct mbuf *)mem; 441 flags = (unsigned long)arg; 442 443 if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0) 444 m_tag_delete_chain(m, NULL); 445 KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__)); 446 KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__)); 447 #ifdef INVARIANTS 448 trash_dtor(mem, size, arg); 449 #endif 450 } 451 452 /* 453 * The Mbuf Packet zone destructor. 454 */ 455 static void 456 mb_dtor_pack(void *mem, int size, void *arg) 457 { 458 struct mbuf *m; 459 460 m = (struct mbuf *)mem; 461 if ((m->m_flags & M_PKTHDR) != 0) 462 m_tag_delete_chain(m, NULL); 463 464 /* Make sure we've got a clean cluster back. */ 465 KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__)); 466 KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__)); 467 KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__)); 468 KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__)); 469 KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__)); 470 KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__)); 471 KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__)); 472 KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__)); 473 #ifdef INVARIANTS 474 trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg); 475 #endif 476 /* 477 * If there are processes blocked on zone_clust, waiting for pages 478 * to be freed up, * cause them to be woken up by draining the 479 * packet zone. We are exposed to a race here * (in the check for 480 * the UMA_ZFLAG_FULL) where we might miss the flag set, but that 481 * is deliberate. We don't want to acquire the zone lock for every 482 * mbuf free. 483 */ 484 if (uma_zone_exhausted_nolock(zone_clust)) 485 zone_drain(zone_pack); 486 } 487 488 /* 489 * The Cluster and Jumbo[PAGESIZE|9|16] zone constructor. 490 * 491 * Here the 'arg' pointer points to the Mbuf which we 492 * are configuring cluster storage for. If 'arg' is 493 * empty we allocate just the cluster without setting 494 * the mbuf to it. See mbuf.h. 495 */ 496 static int 497 mb_ctor_clust(void *mem, int size, void *arg, int how) 498 { 499 struct mbuf *m; 500 u_int *refcnt; 501 int type; 502 uma_zone_t zone; 503 504 #ifdef INVARIANTS 505 trash_ctor(mem, size, arg, how); 506 #endif 507 switch (size) { 508 case MCLBYTES: 509 type = EXT_CLUSTER; 510 zone = zone_clust; 511 break; 512 #if MJUMPAGESIZE != MCLBYTES 513 case MJUMPAGESIZE: 514 type = EXT_JUMBOP; 515 zone = zone_jumbop; 516 break; 517 #endif 518 case MJUM9BYTES: 519 type = EXT_JUMBO9; 520 zone = zone_jumbo9; 521 break; 522 case MJUM16BYTES: 523 type = EXT_JUMBO16; 524 zone = zone_jumbo16; 525 break; 526 default: 527 panic("unknown cluster size"); 528 break; 529 } 530 531 m = (struct mbuf *)arg; 532 refcnt = uma_find_refcnt(zone, mem); 533 *refcnt = 1; 534 if (m != NULL) { 535 m->m_ext.ext_buf = (caddr_t)mem; 536 m->m_data = m->m_ext.ext_buf; 537 m->m_flags |= M_EXT; 538 m->m_ext.ext_free = NULL; 539 m->m_ext.ext_arg1 = NULL; 540 m->m_ext.ext_arg2 = NULL; 541 m->m_ext.ext_size = size; 542 m->m_ext.ext_type = type; 543 m->m_ext.ref_cnt = refcnt; 544 } 545 546 return (0); 547 } 548 549 /* 550 * The Mbuf Cluster zone destructor. 551 */ 552 static void 553 mb_dtor_clust(void *mem, int size, void *arg) 554 { 555 #ifdef INVARIANTS 556 uma_zone_t zone; 557 558 zone = m_getzone(size); 559 KASSERT(*(uma_find_refcnt(zone, mem)) <= 1, 560 ("%s: refcnt incorrect %u", __func__, 561 *(uma_find_refcnt(zone, mem))) ); 562 563 trash_dtor(mem, size, arg); 564 #endif 565 } 566 567 /* 568 * The Packet secondary zone's init routine, executed on the 569 * object's transition from mbuf keg slab to zone cache. 570 */ 571 static int 572 mb_zinit_pack(void *mem, int size, int how) 573 { 574 struct mbuf *m; 575 576 m = (struct mbuf *)mem; /* m is virgin. */ 577 if (uma_zalloc_arg(zone_clust, m, how) == NULL || 578 m->m_ext.ext_buf == NULL) 579 return (ENOMEM); 580 m->m_ext.ext_type = EXT_PACKET; /* Override. */ 581 #ifdef INVARIANTS 582 trash_init(m->m_ext.ext_buf, MCLBYTES, how); 583 #endif 584 return (0); 585 } 586 587 /* 588 * The Packet secondary zone's fini routine, executed on the 589 * object's transition from zone cache to keg slab. 590 */ 591 static void 592 mb_zfini_pack(void *mem, int size) 593 { 594 struct mbuf *m; 595 596 m = (struct mbuf *)mem; 597 #ifdef INVARIANTS 598 trash_fini(m->m_ext.ext_buf, MCLBYTES); 599 #endif 600 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL); 601 #ifdef INVARIANTS 602 trash_dtor(mem, size, NULL); 603 #endif 604 } 605 606 /* 607 * The "packet" keg constructor. 608 */ 609 static int 610 mb_ctor_pack(void *mem, int size, void *arg, int how) 611 { 612 struct mbuf *m; 613 struct mb_args *args; 614 #ifdef MAC 615 int error; 616 #endif 617 int flags; 618 short type; 619 620 m = (struct mbuf *)mem; 621 args = (struct mb_args *)arg; 622 flags = args->flags; 623 type = args->type; 624 625 #ifdef INVARIANTS 626 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how); 627 #endif 628 m->m_next = NULL; 629 m->m_nextpkt = NULL; 630 m->m_data = m->m_ext.ext_buf; 631 m->m_len = 0; 632 m->m_flags = (flags | M_EXT); 633 m->m_type = type; 634 635 if (flags & M_PKTHDR) { 636 m->m_pkthdr.rcvif = NULL; 637 m->m_pkthdr.len = 0; 638 m->m_pkthdr.header = NULL; 639 m->m_pkthdr.csum_flags = 0; 640 m->m_pkthdr.csum_data = 0; 641 m->m_pkthdr.tso_segsz = 0; 642 m->m_pkthdr.ether_vtag = 0; 643 SLIST_INIT(&m->m_pkthdr.tags); 644 #ifdef MAC 645 /* If the label init fails, fail the alloc */ 646 error = mac_mbuf_init(m, how); 647 if (error) 648 return (error); 649 #endif 650 } 651 /* m_ext is already initialized. */ 652 653 return (0); 654 } 655 656 /* 657 * This is the protocol drain routine. 658 * 659 * No locks should be held when this is called. The drain routines have to 660 * presently acquire some locks which raises the possibility of lock order 661 * reversal. 662 */ 663 static void 664 mb_reclaim(void *junk) 665 { 666 struct domain *dp; 667 struct protosw *pr; 668 669 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, 670 "mb_reclaim()"); 671 672 for (dp = domains; dp != NULL; dp = dp->dom_next) 673 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 674 if (pr->pr_drain != NULL) 675 (*pr->pr_drain)(); 676 } 677