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 /* 105 * tunable_mbinit() has to be run before init_maxsockets() thus 106 * the SYSINIT order below is SI_ORDER_MIDDLE while init_maxsockets() 107 * runs at SI_ORDER_ANY. 108 */ 109 static void 110 tunable_mbinit(void *dummy) 111 { 112 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters); 113 114 /* This has to be done before VM init. */ 115 if (nmbclusters == 0) 116 nmbclusters = 1024 + maxusers * 64; 117 nmbjumbop = nmbclusters / 2; 118 nmbjumbo9 = nmbjumbop / 2; 119 nmbjumbo16 = nmbjumbo9 / 2; 120 } 121 SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_mbinit, NULL); 122 123 static int 124 sysctl_nmbclusters(SYSCTL_HANDLER_ARGS) 125 { 126 int error, newnmbclusters; 127 128 newnmbclusters = nmbclusters; 129 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 130 if (error == 0 && req->newptr) { 131 if (newnmbclusters > nmbclusters) { 132 nmbclusters = newnmbclusters; 133 uma_zone_set_max(zone_clust, nmbclusters); 134 EVENTHANDLER_INVOKE(nmbclusters_change); 135 } else 136 error = EINVAL; 137 } 138 return (error); 139 } 140 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW, 141 &nmbclusters, 0, sysctl_nmbclusters, "IU", 142 "Maximum number of mbuf clusters allowed"); 143 144 static int 145 sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS) 146 { 147 int error, newnmbjumbop; 148 149 newnmbjumbop = nmbjumbop; 150 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req); 151 if (error == 0 && req->newptr) { 152 if (newnmbjumbop> nmbjumbop) { 153 nmbjumbop = newnmbjumbop; 154 uma_zone_set_max(zone_jumbop, nmbjumbop); 155 } else 156 error = EINVAL; 157 } 158 return (error); 159 } 160 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW, 161 &nmbjumbop, 0, sysctl_nmbjumbop, "IU", 162 "Maximum number of mbuf page size jumbo clusters allowed"); 163 164 165 static int 166 sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS) 167 { 168 int error, newnmbjumbo9; 169 170 newnmbjumbo9 = nmbjumbo9; 171 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req); 172 if (error == 0 && req->newptr) { 173 if (newnmbjumbo9> nmbjumbo9) { 174 nmbjumbo9 = newnmbjumbo9; 175 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 176 } else 177 error = EINVAL; 178 } 179 return (error); 180 } 181 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW, 182 &nmbjumbo9, 0, sysctl_nmbjumbo9, "IU", 183 "Maximum number of mbuf 9k jumbo clusters allowed"); 184 185 static int 186 sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS) 187 { 188 int error, newnmbjumbo16; 189 190 newnmbjumbo16 = nmbjumbo16; 191 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req); 192 if (error == 0 && req->newptr) { 193 if (newnmbjumbo16> nmbjumbo16) { 194 nmbjumbo16 = newnmbjumbo16; 195 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 196 } else 197 error = EINVAL; 198 } 199 return (error); 200 } 201 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW, 202 &nmbjumbo16, 0, sysctl_nmbjumbo16, "IU", 203 "Maximum number of mbuf 16k jumbo clusters allowed"); 204 205 206 207 SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, 208 "Mbuf general information and statistics"); 209 210 /* 211 * Zones from which we allocate. 212 */ 213 uma_zone_t zone_mbuf; 214 uma_zone_t zone_clust; 215 uma_zone_t zone_pack; 216 uma_zone_t zone_jumbop; 217 uma_zone_t zone_jumbo9; 218 uma_zone_t zone_jumbo16; 219 uma_zone_t zone_ext_refcnt; 220 221 /* 222 * Local prototypes. 223 */ 224 static int mb_ctor_mbuf(void *, int, void *, int); 225 static int mb_ctor_clust(void *, int, void *, int); 226 static int mb_ctor_pack(void *, int, void *, int); 227 static void mb_dtor_mbuf(void *, int, void *); 228 static void mb_dtor_clust(void *, int, void *); 229 static void mb_dtor_pack(void *, int, void *); 230 static int mb_zinit_pack(void *, int, int); 231 static void mb_zfini_pack(void *, int); 232 233 static void mb_reclaim(void *); 234 static void mbuf_init(void *); 235 static void *mbuf_jumbo_alloc(uma_zone_t, int, u_int8_t *, int); 236 static void mbuf_jumbo_free(void *, int, u_int8_t); 237 238 static MALLOC_DEFINE(M_JUMBOFRAME, "jumboframes", "mbuf jumbo frame buffers"); 239 240 /* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */ 241 CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); 242 243 /* 244 * Initialize FreeBSD Network buffer allocation. 245 */ 246 SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL); 247 static void 248 mbuf_init(void *dummy) 249 { 250 251 /* 252 * Configure UMA zones for Mbufs, Clusters, and Packets. 253 */ 254 zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, 255 mb_ctor_mbuf, mb_dtor_mbuf, 256 #ifdef INVARIANTS 257 trash_init, trash_fini, 258 #else 259 NULL, NULL, 260 #endif 261 MSIZE - 1, UMA_ZONE_MAXBUCKET); 262 263 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, 264 mb_ctor_clust, mb_dtor_clust, 265 #ifdef INVARIANTS 266 trash_init, trash_fini, 267 #else 268 NULL, NULL, 269 #endif 270 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 271 if (nmbclusters > 0) 272 uma_zone_set_max(zone_clust, nmbclusters); 273 274 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, 275 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); 276 277 /* Make jumbo frame zone too. Page size, 9k and 16k. */ 278 zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE, 279 mb_ctor_clust, mb_dtor_clust, 280 #ifdef INVARIANTS 281 trash_init, trash_fini, 282 #else 283 NULL, NULL, 284 #endif 285 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 286 if (nmbjumbop > 0) 287 uma_zone_set_max(zone_jumbop, nmbjumbop); 288 289 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, 290 mb_ctor_clust, mb_dtor_clust, 291 #ifdef INVARIANTS 292 trash_init, trash_fini, 293 #else 294 NULL, NULL, 295 #endif 296 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 297 if (nmbjumbo9 > 0) 298 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 299 uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc); 300 uma_zone_set_freef(zone_jumbo9, mbuf_jumbo_free); 301 302 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, 303 mb_ctor_clust, mb_dtor_clust, 304 #ifdef INVARIANTS 305 trash_init, trash_fini, 306 #else 307 NULL, NULL, 308 #endif 309 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 310 if (nmbjumbo16 > 0) 311 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 312 uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc); 313 uma_zone_set_freef(zone_jumbo16, mbuf_jumbo_free); 314 315 zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int), 316 NULL, NULL, 317 NULL, NULL, 318 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 319 320 /* uma_prealloc() goes here... */ 321 322 /* 323 * Hook event handler for low-memory situation, used to 324 * drain protocols and push data back to the caches (UMA 325 * later pushes it back to VM). 326 */ 327 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL, 328 EVENTHANDLER_PRI_FIRST); 329 330 /* 331 * [Re]set counters and local statistics knobs. 332 * XXX Some of these should go and be replaced, but UMA stat 333 * gathering needs to be revised. 334 */ 335 mbstat.m_mbufs = 0; 336 mbstat.m_mclusts = 0; 337 mbstat.m_drain = 0; 338 mbstat.m_msize = MSIZE; 339 mbstat.m_mclbytes = MCLBYTES; 340 mbstat.m_minclsize = MINCLSIZE; 341 mbstat.m_mlen = MLEN; 342 mbstat.m_mhlen = MHLEN; 343 mbstat.m_numtypes = MT_NTYPES; 344 345 mbstat.m_mcfail = mbstat.m_mpfail = 0; 346 mbstat.sf_iocnt = 0; 347 mbstat.sf_allocwait = mbstat.sf_allocfail = 0; 348 } 349 350 /* 351 * UMA backend page allocator for the jumbo frame zones. 352 * 353 * Allocates kernel virtual memory that is backed by contiguous physical 354 * pages. 355 */ 356 static void * 357 mbuf_jumbo_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait) 358 { 359 360 /* Inform UMA that this allocator uses kernel_map/object. */ 361 *flags = UMA_SLAB_KERNEL; 362 return (contigmalloc(bytes, M_JUMBOFRAME, wait, (vm_paddr_t)0, 363 ~(vm_paddr_t)0, 1, 0)); 364 } 365 366 /* 367 * UMA backend page deallocator for the jumbo frame zones. 368 */ 369 static void 370 mbuf_jumbo_free(void *mem, int size, u_int8_t flags) 371 { 372 373 contigfree(mem, size, M_JUMBOFRAME); 374 } 375 376 /* 377 * Constructor for Mbuf master zone. 378 * 379 * The 'arg' pointer points to a mb_args structure which 380 * contains call-specific information required to support the 381 * mbuf allocation API. See mbuf.h. 382 */ 383 static int 384 mb_ctor_mbuf(void *mem, int size, void *arg, int how) 385 { 386 struct mbuf *m; 387 struct mb_args *args; 388 #ifdef MAC 389 int error; 390 #endif 391 int flags; 392 short type; 393 394 #ifdef INVARIANTS 395 trash_ctor(mem, size, arg, how); 396 #endif 397 m = (struct mbuf *)mem; 398 args = (struct mb_args *)arg; 399 flags = args->flags; 400 type = args->type; 401 402 /* 403 * The mbuf is initialized later. The caller has the 404 * responsibility to set up any MAC labels too. 405 */ 406 if (type == MT_NOINIT) 407 return (0); 408 409 m->m_next = NULL; 410 m->m_nextpkt = NULL; 411 m->m_len = 0; 412 m->m_flags = flags; 413 m->m_type = type; 414 if (flags & M_PKTHDR) { 415 m->m_data = m->m_pktdat; 416 m->m_pkthdr.rcvif = NULL; 417 m->m_pkthdr.header = NULL; 418 m->m_pkthdr.len = 0; 419 m->m_pkthdr.csum_flags = 0; 420 m->m_pkthdr.csum_data = 0; 421 m->m_pkthdr.tso_segsz = 0; 422 m->m_pkthdr.ether_vtag = 0; 423 m->m_pkthdr.flowid = 0; 424 SLIST_INIT(&m->m_pkthdr.tags); 425 #ifdef MAC 426 /* If the label init fails, fail the alloc */ 427 error = mac_mbuf_init(m, how); 428 if (error) 429 return (error); 430 #endif 431 } else 432 m->m_data = m->m_dat; 433 return (0); 434 } 435 436 /* 437 * The Mbuf master zone destructor. 438 */ 439 static void 440 mb_dtor_mbuf(void *mem, int size, void *arg) 441 { 442 struct mbuf *m; 443 unsigned long flags; 444 445 m = (struct mbuf *)mem; 446 flags = (unsigned long)arg; 447 448 if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0) 449 m_tag_delete_chain(m, NULL); 450 KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__)); 451 KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__)); 452 #ifdef INVARIANTS 453 trash_dtor(mem, size, arg); 454 #endif 455 } 456 457 /* 458 * The Mbuf Packet zone destructor. 459 */ 460 static void 461 mb_dtor_pack(void *mem, int size, void *arg) 462 { 463 struct mbuf *m; 464 465 m = (struct mbuf *)mem; 466 if ((m->m_flags & M_PKTHDR) != 0) 467 m_tag_delete_chain(m, NULL); 468 469 /* Make sure we've got a clean cluster back. */ 470 KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__)); 471 KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__)); 472 KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__)); 473 KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__)); 474 KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__)); 475 KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__)); 476 KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__)); 477 KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__)); 478 #ifdef INVARIANTS 479 trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg); 480 #endif 481 /* 482 * If there are processes blocked on zone_clust, waiting for pages 483 * to be freed up, * cause them to be woken up by draining the 484 * packet zone. We are exposed to a race here * (in the check for 485 * the UMA_ZFLAG_FULL) where we might miss the flag set, but that 486 * is deliberate. We don't want to acquire the zone lock for every 487 * mbuf free. 488 */ 489 if (uma_zone_exhausted_nolock(zone_clust)) 490 zone_drain(zone_pack); 491 } 492 493 /* 494 * The Cluster and Jumbo[PAGESIZE|9|16] zone constructor. 495 * 496 * Here the 'arg' pointer points to the Mbuf which we 497 * are configuring cluster storage for. If 'arg' is 498 * empty we allocate just the cluster without setting 499 * the mbuf to it. See mbuf.h. 500 */ 501 static int 502 mb_ctor_clust(void *mem, int size, void *arg, int how) 503 { 504 struct mbuf *m; 505 u_int *refcnt; 506 int type; 507 uma_zone_t zone; 508 509 #ifdef INVARIANTS 510 trash_ctor(mem, size, arg, how); 511 #endif 512 switch (size) { 513 case MCLBYTES: 514 type = EXT_CLUSTER; 515 zone = zone_clust; 516 break; 517 #if MJUMPAGESIZE != MCLBYTES 518 case MJUMPAGESIZE: 519 type = EXT_JUMBOP; 520 zone = zone_jumbop; 521 break; 522 #endif 523 case MJUM9BYTES: 524 type = EXT_JUMBO9; 525 zone = zone_jumbo9; 526 break; 527 case MJUM16BYTES: 528 type = EXT_JUMBO16; 529 zone = zone_jumbo16; 530 break; 531 default: 532 panic("unknown cluster size"); 533 break; 534 } 535 536 m = (struct mbuf *)arg; 537 refcnt = uma_find_refcnt(zone, mem); 538 *refcnt = 1; 539 if (m != NULL) { 540 m->m_ext.ext_buf = (caddr_t)mem; 541 m->m_data = m->m_ext.ext_buf; 542 m->m_flags |= M_EXT; 543 m->m_ext.ext_free = NULL; 544 m->m_ext.ext_arg1 = NULL; 545 m->m_ext.ext_arg2 = NULL; 546 m->m_ext.ext_size = size; 547 m->m_ext.ext_type = type; 548 m->m_ext.ref_cnt = refcnt; 549 } 550 551 return (0); 552 } 553 554 /* 555 * The Mbuf Cluster zone destructor. 556 */ 557 static void 558 mb_dtor_clust(void *mem, int size, void *arg) 559 { 560 #ifdef INVARIANTS 561 uma_zone_t zone; 562 563 zone = m_getzone(size); 564 KASSERT(*(uma_find_refcnt(zone, mem)) <= 1, 565 ("%s: refcnt incorrect %u", __func__, 566 *(uma_find_refcnt(zone, mem))) ); 567 568 trash_dtor(mem, size, arg); 569 #endif 570 } 571 572 /* 573 * The Packet secondary zone's init routine, executed on the 574 * object's transition from mbuf keg slab to zone cache. 575 */ 576 static int 577 mb_zinit_pack(void *mem, int size, int how) 578 { 579 struct mbuf *m; 580 581 m = (struct mbuf *)mem; /* m is virgin. */ 582 if (uma_zalloc_arg(zone_clust, m, how) == NULL || 583 m->m_ext.ext_buf == NULL) 584 return (ENOMEM); 585 m->m_ext.ext_type = EXT_PACKET; /* Override. */ 586 #ifdef INVARIANTS 587 trash_init(m->m_ext.ext_buf, MCLBYTES, how); 588 #endif 589 return (0); 590 } 591 592 /* 593 * The Packet secondary zone's fini routine, executed on the 594 * object's transition from zone cache to keg slab. 595 */ 596 static void 597 mb_zfini_pack(void *mem, int size) 598 { 599 struct mbuf *m; 600 601 m = (struct mbuf *)mem; 602 #ifdef INVARIANTS 603 trash_fini(m->m_ext.ext_buf, MCLBYTES); 604 #endif 605 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL); 606 #ifdef INVARIANTS 607 trash_dtor(mem, size, NULL); 608 #endif 609 } 610 611 /* 612 * The "packet" keg constructor. 613 */ 614 static int 615 mb_ctor_pack(void *mem, int size, void *arg, int how) 616 { 617 struct mbuf *m; 618 struct mb_args *args; 619 #ifdef MAC 620 int error; 621 #endif 622 int flags; 623 short type; 624 625 m = (struct mbuf *)mem; 626 args = (struct mb_args *)arg; 627 flags = args->flags; 628 type = args->type; 629 630 #ifdef INVARIANTS 631 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how); 632 #endif 633 m->m_next = NULL; 634 m->m_nextpkt = NULL; 635 m->m_data = m->m_ext.ext_buf; 636 m->m_len = 0; 637 m->m_flags = (flags | M_EXT); 638 m->m_type = type; 639 640 if (flags & M_PKTHDR) { 641 m->m_pkthdr.rcvif = NULL; 642 m->m_pkthdr.len = 0; 643 m->m_pkthdr.header = NULL; 644 m->m_pkthdr.csum_flags = 0; 645 m->m_pkthdr.csum_data = 0; 646 m->m_pkthdr.tso_segsz = 0; 647 m->m_pkthdr.ether_vtag = 0; 648 m->m_pkthdr.flowid = 0; 649 SLIST_INIT(&m->m_pkthdr.tags); 650 #ifdef MAC 651 /* If the label init fails, fail the alloc */ 652 error = mac_mbuf_init(m, how); 653 if (error) 654 return (error); 655 #endif 656 } 657 /* m_ext is already initialized. */ 658 659 return (0); 660 } 661 662 /* 663 * This is the protocol drain routine. 664 * 665 * No locks should be held when this is called. The drain routines have to 666 * presently acquire some locks which raises the possibility of lock order 667 * reversal. 668 */ 669 static void 670 mb_reclaim(void *junk) 671 { 672 struct domain *dp; 673 struct protosw *pr; 674 675 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, 676 "mb_reclaim()"); 677 678 for (dp = domains; dp != NULL; dp = dp->dom_next) 679 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 680 if (pr->pr_drain != NULL) 681 (*pr->pr_drain)(); 682 } 683