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 nmbclusters = 1024 + maxusers * 64; 118 119 TUNABLE_INT_FETCH("kern.ipc.nmbjumbop", &nmbjumbop); 120 if (nmbjumbop == 0) 121 nmbjumbop = nmbclusters / 2; 122 123 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo9", &nmbjumbo9); 124 if (nmbjumbo9 == 0) 125 nmbjumbo9 = nmbclusters / 4; 126 127 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo16", &nmbjumbo16); 128 if (nmbjumbo16 == 0) 129 nmbjumbo16 = nmbclusters / 8; 130 } 131 SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_mbinit, NULL); 132 133 static int 134 sysctl_nmbclusters(SYSCTL_HANDLER_ARGS) 135 { 136 int error, newnmbclusters; 137 138 newnmbclusters = nmbclusters; 139 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 140 if (error == 0 && req->newptr) { 141 if (newnmbclusters > nmbclusters) { 142 nmbclusters = newnmbclusters; 143 uma_zone_set_max(zone_clust, nmbclusters); 144 EVENTHANDLER_INVOKE(nmbclusters_change); 145 } else 146 error = EINVAL; 147 } 148 return (error); 149 } 150 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW, 151 &nmbclusters, 0, sysctl_nmbclusters, "IU", 152 "Maximum number of mbuf clusters allowed"); 153 154 static int 155 sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS) 156 { 157 int error, newnmbjumbop; 158 159 newnmbjumbop = nmbjumbop; 160 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req); 161 if (error == 0 && req->newptr) { 162 if (newnmbjumbop> nmbjumbop) { 163 nmbjumbop = newnmbjumbop; 164 uma_zone_set_max(zone_jumbop, nmbjumbop); 165 } else 166 error = EINVAL; 167 } 168 return (error); 169 } 170 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW, 171 &nmbjumbop, 0, sysctl_nmbjumbop, "IU", 172 "Maximum number of mbuf page size jumbo clusters allowed"); 173 174 175 static int 176 sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS) 177 { 178 int error, newnmbjumbo9; 179 180 newnmbjumbo9 = nmbjumbo9; 181 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req); 182 if (error == 0 && req->newptr) { 183 if (newnmbjumbo9> nmbjumbo9) { 184 nmbjumbo9 = newnmbjumbo9; 185 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 186 } else 187 error = EINVAL; 188 } 189 return (error); 190 } 191 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW, 192 &nmbjumbo9, 0, sysctl_nmbjumbo9, "IU", 193 "Maximum number of mbuf 9k jumbo clusters allowed"); 194 195 static int 196 sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS) 197 { 198 int error, newnmbjumbo16; 199 200 newnmbjumbo16 = nmbjumbo16; 201 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req); 202 if (error == 0 && req->newptr) { 203 if (newnmbjumbo16> nmbjumbo16) { 204 nmbjumbo16 = newnmbjumbo16; 205 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 206 } else 207 error = EINVAL; 208 } 209 return (error); 210 } 211 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW, 212 &nmbjumbo16, 0, sysctl_nmbjumbo16, "IU", 213 "Maximum number of mbuf 16k jumbo clusters allowed"); 214 215 216 217 SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, 218 "Mbuf general information and statistics"); 219 220 /* 221 * Zones from which we allocate. 222 */ 223 uma_zone_t zone_mbuf; 224 uma_zone_t zone_clust; 225 uma_zone_t zone_pack; 226 uma_zone_t zone_jumbop; 227 uma_zone_t zone_jumbo9; 228 uma_zone_t zone_jumbo16; 229 uma_zone_t zone_ext_refcnt; 230 231 /* 232 * Local prototypes. 233 */ 234 static int mb_ctor_mbuf(void *, int, void *, int); 235 static int mb_ctor_clust(void *, int, void *, int); 236 static int mb_ctor_pack(void *, int, void *, int); 237 static void mb_dtor_mbuf(void *, int, void *); 238 static void mb_dtor_clust(void *, int, void *); 239 static void mb_dtor_pack(void *, int, void *); 240 static int mb_zinit_pack(void *, int, int); 241 static void mb_zfini_pack(void *, int); 242 243 static void mb_reclaim(void *); 244 static void mbuf_init(void *); 245 static void *mbuf_jumbo_alloc(uma_zone_t, int, uint8_t *, int); 246 247 /* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */ 248 CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); 249 250 /* 251 * Initialize FreeBSD Network buffer allocation. 252 */ 253 SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL); 254 static void 255 mbuf_init(void *dummy) 256 { 257 258 /* 259 * Configure UMA zones for Mbufs, Clusters, and Packets. 260 */ 261 zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, 262 mb_ctor_mbuf, mb_dtor_mbuf, 263 #ifdef INVARIANTS 264 trash_init, trash_fini, 265 #else 266 NULL, NULL, 267 #endif 268 MSIZE - 1, UMA_ZONE_MAXBUCKET); 269 270 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, 271 mb_ctor_clust, mb_dtor_clust, 272 #ifdef INVARIANTS 273 trash_init, trash_fini, 274 #else 275 NULL, NULL, 276 #endif 277 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 278 if (nmbclusters > 0) 279 uma_zone_set_max(zone_clust, nmbclusters); 280 281 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, 282 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); 283 284 /* Make jumbo frame zone too. Page size, 9k and 16k. */ 285 zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE, 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 (nmbjumbop > 0) 294 uma_zone_set_max(zone_jumbop, nmbjumbop); 295 296 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, 297 mb_ctor_clust, mb_dtor_clust, 298 #ifdef INVARIANTS 299 trash_init, trash_fini, 300 #else 301 NULL, NULL, 302 #endif 303 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 304 if (nmbjumbo9 > 0) 305 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 306 uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc); 307 308 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, 309 mb_ctor_clust, mb_dtor_clust, 310 #ifdef INVARIANTS 311 trash_init, trash_fini, 312 #else 313 NULL, NULL, 314 #endif 315 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 316 if (nmbjumbo16 > 0) 317 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 318 uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc); 319 320 zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int), 321 NULL, NULL, 322 NULL, NULL, 323 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 324 325 /* uma_prealloc() goes here... */ 326 327 /* 328 * Hook event handler for low-memory situation, used to 329 * drain protocols and push data back to the caches (UMA 330 * later pushes it back to VM). 331 */ 332 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL, 333 EVENTHANDLER_PRI_FIRST); 334 335 /* 336 * [Re]set counters and local statistics knobs. 337 * XXX Some of these should go and be replaced, but UMA stat 338 * gathering needs to be revised. 339 */ 340 mbstat.m_mbufs = 0; 341 mbstat.m_mclusts = 0; 342 mbstat.m_drain = 0; 343 mbstat.m_msize = MSIZE; 344 mbstat.m_mclbytes = MCLBYTES; 345 mbstat.m_minclsize = MINCLSIZE; 346 mbstat.m_mlen = MLEN; 347 mbstat.m_mhlen = MHLEN; 348 mbstat.m_numtypes = MT_NTYPES; 349 350 mbstat.m_mcfail = mbstat.m_mpfail = 0; 351 mbstat.sf_iocnt = 0; 352 mbstat.sf_allocwait = mbstat.sf_allocfail = 0; 353 } 354 355 /* 356 * UMA backend page allocator for the jumbo frame zones. 357 * 358 * Allocates kernel virtual memory that is backed by contiguous physical 359 * pages. 360 */ 361 static void * 362 mbuf_jumbo_alloc(uma_zone_t zone, int bytes, uint8_t *flags, int wait) 363 { 364 365 /* Inform UMA that this allocator uses kernel_map/object. */ 366 *flags = UMA_SLAB_KERNEL; 367 return ((void *)kmem_alloc_contig(kernel_map, bytes, wait, 368 (vm_paddr_t)0, ~(vm_paddr_t)0, 1, 0, VM_MEMATTR_DEFAULT)); 369 } 370 371 /* 372 * Constructor for Mbuf master zone. 373 * 374 * The 'arg' pointer points to a mb_args structure which 375 * contains call-specific information required to support the 376 * mbuf allocation API. See mbuf.h. 377 */ 378 static int 379 mb_ctor_mbuf(void *mem, int size, void *arg, int how) 380 { 381 struct mbuf *m; 382 struct mb_args *args; 383 #ifdef MAC 384 int error; 385 #endif 386 int flags; 387 short type; 388 389 #ifdef INVARIANTS 390 trash_ctor(mem, size, arg, how); 391 #endif 392 m = (struct mbuf *)mem; 393 args = (struct mb_args *)arg; 394 flags = args->flags; 395 type = args->type; 396 397 /* 398 * The mbuf is initialized later. The caller has the 399 * responsibility to set up any MAC labels too. 400 */ 401 if (type == MT_NOINIT) 402 return (0); 403 404 m->m_next = NULL; 405 m->m_nextpkt = NULL; 406 m->m_len = 0; 407 m->m_flags = flags; 408 m->m_type = type; 409 if (flags & M_PKTHDR) { 410 m->m_data = m->m_pktdat; 411 m->m_pkthdr.rcvif = NULL; 412 m->m_pkthdr.header = NULL; 413 m->m_pkthdr.len = 0; 414 m->m_pkthdr.csum_flags = 0; 415 m->m_pkthdr.csum_data = 0; 416 m->m_pkthdr.tso_segsz = 0; 417 m->m_pkthdr.ether_vtag = 0; 418 m->m_pkthdr.flowid = 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 m->m_pkthdr.flowid = 0; 644 SLIST_INIT(&m->m_pkthdr.tags); 645 #ifdef MAC 646 /* If the label init fails, fail the alloc */ 647 error = mac_mbuf_init(m, how); 648 if (error) 649 return (error); 650 #endif 651 } 652 /* m_ext is already initialized. */ 653 654 return (0); 655 } 656 657 int 658 m_pkthdr_init(struct mbuf *m, int how) 659 { 660 #ifdef MAC 661 int error; 662 #endif 663 m->m_data = m->m_pktdat; 664 SLIST_INIT(&m->m_pkthdr.tags); 665 m->m_pkthdr.rcvif = NULL; 666 m->m_pkthdr.header = NULL; 667 m->m_pkthdr.len = 0; 668 m->m_pkthdr.flowid = 0; 669 m->m_pkthdr.csum_flags = 0; 670 m->m_pkthdr.csum_data = 0; 671 m->m_pkthdr.tso_segsz = 0; 672 m->m_pkthdr.ether_vtag = 0; 673 #ifdef MAC 674 /* If the label init fails, fail the alloc */ 675 error = mac_mbuf_init(m, how); 676 if (error) 677 return (error); 678 #endif 679 680 return (0); 681 } 682 683 /* 684 * This is the protocol drain routine. 685 * 686 * No locks should be held when this is called. The drain routines have to 687 * presently acquire some locks which raises the possibility of lock order 688 * reversal. 689 */ 690 static void 691 mb_reclaim(void *junk) 692 { 693 struct domain *dp; 694 struct protosw *pr; 695 696 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, 697 "mb_reclaim()"); 698 699 for (dp = domains; dp != NULL; dp = dp->dom_next) 700 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 701 if (pr->pr_drain != NULL) 702 (*pr->pr_drain)(); 703 } 704