140} 141SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_mbinit, NULL); 142 143static int 144sysctl_nmbclusters(SYSCTL_HANDLER_ARGS) 145{ 146 int error, newnmbclusters; 147 148 newnmbclusters = nmbclusters; 149 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 150 if (error == 0 && req->newptr) { 151 if (newnmbclusters > nmbclusters && 152 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 153 nmbclusters = newnmbclusters; 154 uma_zone_set_max(zone_clust, nmbclusters); 155 nmbclusters = uma_zone_get_max(zone_clust); 156 EVENTHANDLER_INVOKE(nmbclusters_change); 157 } else 158 error = EINVAL; 159 } 160 return (error); 161} 162SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW, 163&nmbclusters, 0, sysctl_nmbclusters, "IU", 164 "Maximum number of mbuf clusters allowed"); 165 166static int 167sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS) 168{ 169 int error, newnmbjumbop; 170 171 newnmbjumbop = nmbjumbop; 172 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req); 173 if (error == 0 && req->newptr) { 174 if (newnmbjumbop > nmbjumbop && 175 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 176 nmbjumbop = newnmbjumbop; 177 uma_zone_set_max(zone_jumbop, nmbjumbop); 178 nmbjumbop = uma_zone_get_max(zone_jumbop); 179 } else 180 error = EINVAL; 181 } 182 return (error); 183} 184SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW, 185&nmbjumbop, 0, sysctl_nmbjumbop, "IU", 186 "Maximum number of mbuf page size jumbo clusters allowed"); 187 188 189static int 190sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS) 191{ 192 int error, newnmbjumbo9; 193 194 newnmbjumbo9 = nmbjumbo9; 195 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req); 196 if (error == 0 && req->newptr) { 197 if (newnmbjumbo9 > nmbjumbo9&& 198 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 199 nmbjumbo9 = newnmbjumbo9; 200 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 201 nmbjumbo9 = uma_zone_get_max(zone_jumbo9); 202 } else 203 error = EINVAL; 204 } 205 return (error); 206} 207SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW, 208&nmbjumbo9, 0, sysctl_nmbjumbo9, "IU", 209 "Maximum number of mbuf 9k jumbo clusters allowed"); 210 211static int 212sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS) 213{ 214 int error, newnmbjumbo16; 215 216 newnmbjumbo16 = nmbjumbo16; 217 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req); 218 if (error == 0 && req->newptr) { 219 if (newnmbjumbo16 > nmbjumbo16 && 220 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 221 nmbjumbo16 = newnmbjumbo16; 222 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 223 nmbjumbo16 = uma_zone_get_max(zone_jumbo16); 224 } else 225 error = EINVAL; 226 } 227 return (error); 228} 229SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW, 230&nmbjumbo16, 0, sysctl_nmbjumbo16, "IU", 231 "Maximum number of mbuf 16k jumbo clusters allowed"); 232 233static int 234sysctl_nmbufs(SYSCTL_HANDLER_ARGS) 235{ 236 int error, newnmbufs; 237 238 newnmbufs = nmbufs; 239 error = sysctl_handle_int(oidp, &newnmbufs, 0, req); 240 if (error == 0 && req->newptr) { 241 if (newnmbufs > nmbufs) { 242 nmbufs = newnmbufs; 243 uma_zone_set_max(zone_mbuf, nmbufs);
| 142} 143SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_mbinit, NULL); 144 145static int 146sysctl_nmbclusters(SYSCTL_HANDLER_ARGS) 147{ 148 int error, newnmbclusters; 149 150 newnmbclusters = nmbclusters; 151 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 152 if (error == 0 && req->newptr) { 153 if (newnmbclusters > nmbclusters && 154 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 155 nmbclusters = newnmbclusters; 156 uma_zone_set_max(zone_clust, nmbclusters); 157 nmbclusters = uma_zone_get_max(zone_clust); 158 EVENTHANDLER_INVOKE(nmbclusters_change); 159 } else 160 error = EINVAL; 161 } 162 return (error); 163} 164SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW, 165&nmbclusters, 0, sysctl_nmbclusters, "IU", 166 "Maximum number of mbuf clusters allowed"); 167 168static int 169sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS) 170{ 171 int error, newnmbjumbop; 172 173 newnmbjumbop = nmbjumbop; 174 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req); 175 if (error == 0 && req->newptr) { 176 if (newnmbjumbop > nmbjumbop && 177 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 178 nmbjumbop = newnmbjumbop; 179 uma_zone_set_max(zone_jumbop, nmbjumbop); 180 nmbjumbop = uma_zone_get_max(zone_jumbop); 181 } else 182 error = EINVAL; 183 } 184 return (error); 185} 186SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW, 187&nmbjumbop, 0, sysctl_nmbjumbop, "IU", 188 "Maximum number of mbuf page size jumbo clusters allowed"); 189 190 191static int 192sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS) 193{ 194 int error, newnmbjumbo9; 195 196 newnmbjumbo9 = nmbjumbo9; 197 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req); 198 if (error == 0 && req->newptr) { 199 if (newnmbjumbo9 > nmbjumbo9&& 200 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 201 nmbjumbo9 = newnmbjumbo9; 202 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 203 nmbjumbo9 = uma_zone_get_max(zone_jumbo9); 204 } else 205 error = EINVAL; 206 } 207 return (error); 208} 209SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW, 210&nmbjumbo9, 0, sysctl_nmbjumbo9, "IU", 211 "Maximum number of mbuf 9k jumbo clusters allowed"); 212 213static int 214sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS) 215{ 216 int error, newnmbjumbo16; 217 218 newnmbjumbo16 = nmbjumbo16; 219 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req); 220 if (error == 0 && req->newptr) { 221 if (newnmbjumbo16 > nmbjumbo16 && 222 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 223 nmbjumbo16 = newnmbjumbo16; 224 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 225 nmbjumbo16 = uma_zone_get_max(zone_jumbo16); 226 } else 227 error = EINVAL; 228 } 229 return (error); 230} 231SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW, 232&nmbjumbo16, 0, sysctl_nmbjumbo16, "IU", 233 "Maximum number of mbuf 16k jumbo clusters allowed"); 234 235static int 236sysctl_nmbufs(SYSCTL_HANDLER_ARGS) 237{ 238 int error, newnmbufs; 239 240 newnmbufs = nmbufs; 241 error = sysctl_handle_int(oidp, &newnmbufs, 0, req); 242 if (error == 0 && req->newptr) { 243 if (newnmbufs > nmbufs) { 244 nmbufs = newnmbufs; 245 uma_zone_set_max(zone_mbuf, nmbufs);
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245 EVENTHANDLER_INVOKE(nmbufs_change); 246 } else 247 error = EINVAL; 248 } 249 return (error); 250} 251SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbuf, CTLTYPE_INT|CTLFLAG_RW, 252&nmbufs, 0, sysctl_nmbufs, "IU", 253 "Maximum number of mbufs allowed"); 254 255 256SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, 257 "Mbuf general information and statistics"); 258 259/* 260 * Zones from which we allocate. 261 */ 262uma_zone_t zone_mbuf; 263uma_zone_t zone_clust; 264uma_zone_t zone_pack; 265uma_zone_t zone_jumbop; 266uma_zone_t zone_jumbo9; 267uma_zone_t zone_jumbo16; 268uma_zone_t zone_ext_refcnt; 269 270/* 271 * Local prototypes. 272 */ 273static int mb_ctor_mbuf(void *, int, void *, int); 274static int mb_ctor_clust(void *, int, void *, int); 275static int mb_ctor_pack(void *, int, void *, int); 276static void mb_dtor_mbuf(void *, int, void *); 277static void mb_dtor_clust(void *, int, void *); 278static void mb_dtor_pack(void *, int, void *); 279static int mb_zinit_pack(void *, int, int); 280static void mb_zfini_pack(void *, int); 281 282static void mb_reclaim(void *); 283static void mbuf_init(void *); 284static void *mbuf_jumbo_alloc(uma_zone_t, int, uint8_t *, int); 285 286/* Ensure that MSIZE must be a power of 2. */ 287CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); 288 289/* 290 * Initialize FreeBSD Network buffer allocation. 291 */ 292SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL); 293static void 294mbuf_init(void *dummy) 295{ 296 297 /* 298 * Configure UMA zones for Mbufs, Clusters, and Packets. 299 */ 300 zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, 301 mb_ctor_mbuf, mb_dtor_mbuf, 302#ifdef INVARIANTS 303 trash_init, trash_fini, 304#else 305 NULL, NULL, 306#endif 307 MSIZE - 1, UMA_ZONE_MAXBUCKET); 308 if (nmbufs > 0) { 309 uma_zone_set_max(zone_mbuf, nmbufs); 310 nmbufs = uma_zone_get_max(zone_mbuf); 311 } 312 313 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, 314 mb_ctor_clust, mb_dtor_clust, 315#ifdef INVARIANTS 316 trash_init, trash_fini, 317#else 318 NULL, NULL, 319#endif 320 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 321 if (nmbclusters > 0) { 322 uma_zone_set_max(zone_clust, nmbclusters); 323 nmbclusters = uma_zone_get_max(zone_clust); 324 } 325 326 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, 327 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); 328 329 /* Make jumbo frame zone too. Page size, 9k and 16k. */ 330 zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE, 331 mb_ctor_clust, mb_dtor_clust, 332#ifdef INVARIANTS 333 trash_init, trash_fini, 334#else 335 NULL, NULL, 336#endif 337 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 338 if (nmbjumbop > 0) { 339 uma_zone_set_max(zone_jumbop, nmbjumbop); 340 nmbjumbop = uma_zone_get_max(zone_jumbop); 341 } 342 343 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, 344 mb_ctor_clust, mb_dtor_clust, 345#ifdef INVARIANTS 346 trash_init, trash_fini, 347#else 348 NULL, NULL, 349#endif 350 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 351 uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc); 352 if (nmbjumbo9 > 0) { 353 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 354 nmbjumbo9 = uma_zone_get_max(zone_jumbo9); 355 } 356 357 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, 358 mb_ctor_clust, mb_dtor_clust, 359#ifdef INVARIANTS 360 trash_init, trash_fini, 361#else 362 NULL, NULL, 363#endif 364 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 365 uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc); 366 if (nmbjumbo16 > 0) { 367 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 368 nmbjumbo16 = uma_zone_get_max(zone_jumbo16); 369 } 370 371 zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int), 372 NULL, NULL, 373 NULL, NULL, 374 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 375 376 /* uma_prealloc() goes here... */ 377 378 /* 379 * Hook event handler for low-memory situation, used to 380 * drain protocols and push data back to the caches (UMA 381 * later pushes it back to VM). 382 */ 383 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL, 384 EVENTHANDLER_PRI_FIRST); 385 386 /* 387 * [Re]set counters and local statistics knobs. 388 * XXX Some of these should go and be replaced, but UMA stat 389 * gathering needs to be revised. 390 */ 391 mbstat.m_mbufs = 0; 392 mbstat.m_mclusts = 0; 393 mbstat.m_drain = 0; 394 mbstat.m_msize = MSIZE; 395 mbstat.m_mclbytes = MCLBYTES; 396 mbstat.m_minclsize = MINCLSIZE; 397 mbstat.m_mlen = MLEN; 398 mbstat.m_mhlen = MHLEN; 399 mbstat.m_numtypes = MT_NTYPES; 400 401 mbstat.m_mcfail = mbstat.m_mpfail = 0; 402 mbstat.sf_iocnt = 0; 403 mbstat.sf_allocwait = mbstat.sf_allocfail = 0; 404} 405 406/* 407 * UMA backend page allocator for the jumbo frame zones. 408 * 409 * Allocates kernel virtual memory that is backed by contiguous physical 410 * pages. 411 */ 412static void * 413mbuf_jumbo_alloc(uma_zone_t zone, int bytes, uint8_t *flags, int wait) 414{ 415 416 /* Inform UMA that this allocator uses kernel_map/object. */ 417 *flags = UMA_SLAB_KERNEL; 418 return ((void *)kmem_alloc_contig(kernel_map, bytes, wait, 419 (vm_paddr_t)0, ~(vm_paddr_t)0, 1, 0, VM_MEMATTR_DEFAULT)); 420} 421 422/* 423 * Constructor for Mbuf master zone. 424 * 425 * The 'arg' pointer points to a mb_args structure which 426 * contains call-specific information required to support the 427 * mbuf allocation API. See mbuf.h. 428 */ 429static int 430mb_ctor_mbuf(void *mem, int size, void *arg, int how) 431{ 432 struct mbuf *m; 433 struct mb_args *args; 434#ifdef MAC 435 int error; 436#endif 437 int flags; 438 short type; 439 440#ifdef INVARIANTS 441 trash_ctor(mem, size, arg, how); 442#endif 443 m = (struct mbuf *)mem; 444 args = (struct mb_args *)arg; 445 flags = args->flags; 446 type = args->type; 447 448 /* 449 * The mbuf is initialized later. The caller has the 450 * responsibility to set up any MAC labels too. 451 */ 452 if (type == MT_NOINIT) 453 return (0); 454 455 m->m_next = NULL; 456 m->m_nextpkt = NULL; 457 m->m_len = 0; 458 m->m_flags = flags; 459 m->m_type = type; 460 if (flags & M_PKTHDR) { 461 m->m_data = m->m_pktdat; 462 m->m_pkthdr.rcvif = NULL; 463 m->m_pkthdr.header = NULL; 464 m->m_pkthdr.len = 0; 465 m->m_pkthdr.csum_flags = 0; 466 m->m_pkthdr.csum_data = 0; 467 m->m_pkthdr.tso_segsz = 0; 468 m->m_pkthdr.ether_vtag = 0; 469 m->m_pkthdr.flowid = 0; 470 SLIST_INIT(&m->m_pkthdr.tags); 471#ifdef MAC 472 /* If the label init fails, fail the alloc */ 473 error = mac_mbuf_init(m, how); 474 if (error) 475 return (error); 476#endif 477 } else 478 m->m_data = m->m_dat; 479 return (0); 480} 481 482/* 483 * The Mbuf master zone destructor. 484 */ 485static void 486mb_dtor_mbuf(void *mem, int size, void *arg) 487{ 488 struct mbuf *m; 489 unsigned long flags; 490 491 m = (struct mbuf *)mem; 492 flags = (unsigned long)arg; 493 494 if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0) 495 m_tag_delete_chain(m, NULL); 496 KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__)); 497 KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__)); 498#ifdef INVARIANTS 499 trash_dtor(mem, size, arg); 500#endif 501} 502 503/* 504 * The Mbuf Packet zone destructor. 505 */ 506static void 507mb_dtor_pack(void *mem, int size, void *arg) 508{ 509 struct mbuf *m; 510 511 m = (struct mbuf *)mem; 512 if ((m->m_flags & M_PKTHDR) != 0) 513 m_tag_delete_chain(m, NULL); 514 515 /* Make sure we've got a clean cluster back. */ 516 KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__)); 517 KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__)); 518 KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__)); 519 KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__)); 520 KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__)); 521 KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__)); 522 KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__)); 523 KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__)); 524#ifdef INVARIANTS 525 trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg); 526#endif 527 /* 528 * If there are processes blocked on zone_clust, waiting for pages 529 * to be freed up, * cause them to be woken up by draining the 530 * packet zone. We are exposed to a race here * (in the check for 531 * the UMA_ZFLAG_FULL) where we might miss the flag set, but that 532 * is deliberate. We don't want to acquire the zone lock for every 533 * mbuf free. 534 */ 535 if (uma_zone_exhausted_nolock(zone_clust)) 536 zone_drain(zone_pack); 537} 538 539/* 540 * The Cluster and Jumbo[PAGESIZE|9|16] zone constructor. 541 * 542 * Here the 'arg' pointer points to the Mbuf which we 543 * are configuring cluster storage for. If 'arg' is 544 * empty we allocate just the cluster without setting 545 * the mbuf to it. See mbuf.h. 546 */ 547static int 548mb_ctor_clust(void *mem, int size, void *arg, int how) 549{ 550 struct mbuf *m; 551 u_int *refcnt; 552 int type; 553 uma_zone_t zone; 554 555#ifdef INVARIANTS 556 trash_ctor(mem, size, arg, how); 557#endif 558 switch (size) { 559 case MCLBYTES: 560 type = EXT_CLUSTER; 561 zone = zone_clust; 562 break; 563#if MJUMPAGESIZE != MCLBYTES 564 case MJUMPAGESIZE: 565 type = EXT_JUMBOP; 566 zone = zone_jumbop; 567 break; 568#endif 569 case MJUM9BYTES: 570 type = EXT_JUMBO9; 571 zone = zone_jumbo9; 572 break; 573 case MJUM16BYTES: 574 type = EXT_JUMBO16; 575 zone = zone_jumbo16; 576 break; 577 default: 578 panic("unknown cluster size"); 579 break; 580 } 581 582 m = (struct mbuf *)arg; 583 refcnt = uma_find_refcnt(zone, mem); 584 *refcnt = 1; 585 if (m != NULL) { 586 m->m_ext.ext_buf = (caddr_t)mem; 587 m->m_data = m->m_ext.ext_buf; 588 m->m_flags |= M_EXT; 589 m->m_ext.ext_free = NULL; 590 m->m_ext.ext_arg1 = NULL; 591 m->m_ext.ext_arg2 = NULL; 592 m->m_ext.ext_size = size; 593 m->m_ext.ext_type = type; 594 m->m_ext.ref_cnt = refcnt; 595 } 596 597 return (0); 598} 599 600/* 601 * The Mbuf Cluster zone destructor. 602 */ 603static void 604mb_dtor_clust(void *mem, int size, void *arg) 605{ 606#ifdef INVARIANTS 607 uma_zone_t zone; 608 609 zone = m_getzone(size); 610 KASSERT(*(uma_find_refcnt(zone, mem)) <= 1, 611 ("%s: refcnt incorrect %u", __func__, 612 *(uma_find_refcnt(zone, mem))) ); 613 614 trash_dtor(mem, size, arg); 615#endif 616} 617 618/* 619 * The Packet secondary zone's init routine, executed on the 620 * object's transition from mbuf keg slab to zone cache. 621 */ 622static int 623mb_zinit_pack(void *mem, int size, int how) 624{ 625 struct mbuf *m; 626 627 m = (struct mbuf *)mem; /* m is virgin. */ 628 if (uma_zalloc_arg(zone_clust, m, how) == NULL || 629 m->m_ext.ext_buf == NULL) 630 return (ENOMEM); 631 m->m_ext.ext_type = EXT_PACKET; /* Override. */ 632#ifdef INVARIANTS 633 trash_init(m->m_ext.ext_buf, MCLBYTES, how); 634#endif 635 return (0); 636} 637 638/* 639 * The Packet secondary zone's fini routine, executed on the 640 * object's transition from zone cache to keg slab. 641 */ 642static void 643mb_zfini_pack(void *mem, int size) 644{ 645 struct mbuf *m; 646 647 m = (struct mbuf *)mem; 648#ifdef INVARIANTS 649 trash_fini(m->m_ext.ext_buf, MCLBYTES); 650#endif 651 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL); 652#ifdef INVARIANTS 653 trash_dtor(mem, size, NULL); 654#endif 655} 656 657/* 658 * The "packet" keg constructor. 659 */ 660static int 661mb_ctor_pack(void *mem, int size, void *arg, int how) 662{ 663 struct mbuf *m; 664 struct mb_args *args; 665#ifdef MAC 666 int error; 667#endif 668 int flags; 669 short type; 670 671 m = (struct mbuf *)mem; 672 args = (struct mb_args *)arg; 673 flags = args->flags; 674 type = args->type; 675 676#ifdef INVARIANTS 677 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how); 678#endif 679 m->m_next = NULL; 680 m->m_nextpkt = NULL; 681 m->m_data = m->m_ext.ext_buf; 682 m->m_len = 0; 683 m->m_flags = (flags | M_EXT); 684 m->m_type = type; 685 686 if (flags & M_PKTHDR) { 687 m->m_pkthdr.rcvif = NULL; 688 m->m_pkthdr.len = 0; 689 m->m_pkthdr.header = NULL; 690 m->m_pkthdr.csum_flags = 0; 691 m->m_pkthdr.csum_data = 0; 692 m->m_pkthdr.tso_segsz = 0; 693 m->m_pkthdr.ether_vtag = 0; 694 m->m_pkthdr.flowid = 0; 695 SLIST_INIT(&m->m_pkthdr.tags); 696#ifdef MAC 697 /* If the label init fails, fail the alloc */ 698 error = mac_mbuf_init(m, how); 699 if (error) 700 return (error); 701#endif 702 } 703 /* m_ext is already initialized. */ 704 705 return (0); 706} 707 708int 709m_pkthdr_init(struct mbuf *m, int how) 710{ 711#ifdef MAC 712 int error; 713#endif 714 m->m_data = m->m_pktdat; 715 SLIST_INIT(&m->m_pkthdr.tags); 716 m->m_pkthdr.rcvif = NULL; 717 m->m_pkthdr.header = NULL; 718 m->m_pkthdr.len = 0; 719 m->m_pkthdr.flowid = 0; 720 m->m_pkthdr.csum_flags = 0; 721 m->m_pkthdr.csum_data = 0; 722 m->m_pkthdr.tso_segsz = 0; 723 m->m_pkthdr.ether_vtag = 0; 724#ifdef MAC 725 /* If the label init fails, fail the alloc */ 726 error = mac_mbuf_init(m, how); 727 if (error) 728 return (error); 729#endif 730 731 return (0); 732} 733 734/* 735 * This is the protocol drain routine. 736 * 737 * No locks should be held when this is called. The drain routines have to 738 * presently acquire some locks which raises the possibility of lock order 739 * reversal. 740 */ 741static void 742mb_reclaim(void *junk) 743{ 744 struct domain *dp; 745 struct protosw *pr; 746 747 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, 748 "mb_reclaim()"); 749 750 for (dp = domains; dp != NULL; dp = dp->dom_next) 751 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 752 if (pr->pr_drain != NULL) 753 (*pr->pr_drain)(); 754}
| 247 EVENTHANDLER_INVOKE(nmbufs_change); 248 } else 249 error = EINVAL; 250 } 251 return (error); 252} 253SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbuf, CTLTYPE_INT|CTLFLAG_RW, 254&nmbufs, 0, sysctl_nmbufs, "IU", 255 "Maximum number of mbufs allowed"); 256 257 258SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, 259 "Mbuf general information and statistics"); 260 261/* 262 * Zones from which we allocate. 263 */ 264uma_zone_t zone_mbuf; 265uma_zone_t zone_clust; 266uma_zone_t zone_pack; 267uma_zone_t zone_jumbop; 268uma_zone_t zone_jumbo9; 269uma_zone_t zone_jumbo16; 270uma_zone_t zone_ext_refcnt; 271 272/* 273 * Local prototypes. 274 */ 275static int mb_ctor_mbuf(void *, int, void *, int); 276static int mb_ctor_clust(void *, int, void *, int); 277static int mb_ctor_pack(void *, int, void *, int); 278static void mb_dtor_mbuf(void *, int, void *); 279static void mb_dtor_clust(void *, int, void *); 280static void mb_dtor_pack(void *, int, void *); 281static int mb_zinit_pack(void *, int, int); 282static void mb_zfini_pack(void *, int); 283 284static void mb_reclaim(void *); 285static void mbuf_init(void *); 286static void *mbuf_jumbo_alloc(uma_zone_t, int, uint8_t *, int); 287 288/* Ensure that MSIZE must be a power of 2. */ 289CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); 290 291/* 292 * Initialize FreeBSD Network buffer allocation. 293 */ 294SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL); 295static void 296mbuf_init(void *dummy) 297{ 298 299 /* 300 * Configure UMA zones for Mbufs, Clusters, and Packets. 301 */ 302 zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, 303 mb_ctor_mbuf, mb_dtor_mbuf, 304#ifdef INVARIANTS 305 trash_init, trash_fini, 306#else 307 NULL, NULL, 308#endif 309 MSIZE - 1, UMA_ZONE_MAXBUCKET); 310 if (nmbufs > 0) { 311 uma_zone_set_max(zone_mbuf, nmbufs); 312 nmbufs = uma_zone_get_max(zone_mbuf); 313 } 314 315 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, 316 mb_ctor_clust, mb_dtor_clust, 317#ifdef INVARIANTS 318 trash_init, trash_fini, 319#else 320 NULL, NULL, 321#endif 322 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 323 if (nmbclusters > 0) { 324 uma_zone_set_max(zone_clust, nmbclusters); 325 nmbclusters = uma_zone_get_max(zone_clust); 326 } 327 328 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, 329 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); 330 331 /* Make jumbo frame zone too. Page size, 9k and 16k. */ 332 zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE, 333 mb_ctor_clust, mb_dtor_clust, 334#ifdef INVARIANTS 335 trash_init, trash_fini, 336#else 337 NULL, NULL, 338#endif 339 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 340 if (nmbjumbop > 0) { 341 uma_zone_set_max(zone_jumbop, nmbjumbop); 342 nmbjumbop = uma_zone_get_max(zone_jumbop); 343 } 344 345 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, 346 mb_ctor_clust, mb_dtor_clust, 347#ifdef INVARIANTS 348 trash_init, trash_fini, 349#else 350 NULL, NULL, 351#endif 352 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 353 uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc); 354 if (nmbjumbo9 > 0) { 355 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 356 nmbjumbo9 = uma_zone_get_max(zone_jumbo9); 357 } 358 359 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, 360 mb_ctor_clust, mb_dtor_clust, 361#ifdef INVARIANTS 362 trash_init, trash_fini, 363#else 364 NULL, NULL, 365#endif 366 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 367 uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc); 368 if (nmbjumbo16 > 0) { 369 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 370 nmbjumbo16 = uma_zone_get_max(zone_jumbo16); 371 } 372 373 zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int), 374 NULL, NULL, 375 NULL, NULL, 376 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 377 378 /* uma_prealloc() goes here... */ 379 380 /* 381 * Hook event handler for low-memory situation, used to 382 * drain protocols and push data back to the caches (UMA 383 * later pushes it back to VM). 384 */ 385 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL, 386 EVENTHANDLER_PRI_FIRST); 387 388 /* 389 * [Re]set counters and local statistics knobs. 390 * XXX Some of these should go and be replaced, but UMA stat 391 * gathering needs to be revised. 392 */ 393 mbstat.m_mbufs = 0; 394 mbstat.m_mclusts = 0; 395 mbstat.m_drain = 0; 396 mbstat.m_msize = MSIZE; 397 mbstat.m_mclbytes = MCLBYTES; 398 mbstat.m_minclsize = MINCLSIZE; 399 mbstat.m_mlen = MLEN; 400 mbstat.m_mhlen = MHLEN; 401 mbstat.m_numtypes = MT_NTYPES; 402 403 mbstat.m_mcfail = mbstat.m_mpfail = 0; 404 mbstat.sf_iocnt = 0; 405 mbstat.sf_allocwait = mbstat.sf_allocfail = 0; 406} 407 408/* 409 * UMA backend page allocator for the jumbo frame zones. 410 * 411 * Allocates kernel virtual memory that is backed by contiguous physical 412 * pages. 413 */ 414static void * 415mbuf_jumbo_alloc(uma_zone_t zone, int bytes, uint8_t *flags, int wait) 416{ 417 418 /* Inform UMA that this allocator uses kernel_map/object. */ 419 *flags = UMA_SLAB_KERNEL; 420 return ((void *)kmem_alloc_contig(kernel_map, bytes, wait, 421 (vm_paddr_t)0, ~(vm_paddr_t)0, 1, 0, VM_MEMATTR_DEFAULT)); 422} 423 424/* 425 * Constructor for Mbuf master zone. 426 * 427 * The 'arg' pointer points to a mb_args structure which 428 * contains call-specific information required to support the 429 * mbuf allocation API. See mbuf.h. 430 */ 431static int 432mb_ctor_mbuf(void *mem, int size, void *arg, int how) 433{ 434 struct mbuf *m; 435 struct mb_args *args; 436#ifdef MAC 437 int error; 438#endif 439 int flags; 440 short type; 441 442#ifdef INVARIANTS 443 trash_ctor(mem, size, arg, how); 444#endif 445 m = (struct mbuf *)mem; 446 args = (struct mb_args *)arg; 447 flags = args->flags; 448 type = args->type; 449 450 /* 451 * The mbuf is initialized later. The caller has the 452 * responsibility to set up any MAC labels too. 453 */ 454 if (type == MT_NOINIT) 455 return (0); 456 457 m->m_next = NULL; 458 m->m_nextpkt = NULL; 459 m->m_len = 0; 460 m->m_flags = flags; 461 m->m_type = type; 462 if (flags & M_PKTHDR) { 463 m->m_data = m->m_pktdat; 464 m->m_pkthdr.rcvif = NULL; 465 m->m_pkthdr.header = NULL; 466 m->m_pkthdr.len = 0; 467 m->m_pkthdr.csum_flags = 0; 468 m->m_pkthdr.csum_data = 0; 469 m->m_pkthdr.tso_segsz = 0; 470 m->m_pkthdr.ether_vtag = 0; 471 m->m_pkthdr.flowid = 0; 472 SLIST_INIT(&m->m_pkthdr.tags); 473#ifdef MAC 474 /* If the label init fails, fail the alloc */ 475 error = mac_mbuf_init(m, how); 476 if (error) 477 return (error); 478#endif 479 } else 480 m->m_data = m->m_dat; 481 return (0); 482} 483 484/* 485 * The Mbuf master zone destructor. 486 */ 487static void 488mb_dtor_mbuf(void *mem, int size, void *arg) 489{ 490 struct mbuf *m; 491 unsigned long flags; 492 493 m = (struct mbuf *)mem; 494 flags = (unsigned long)arg; 495 496 if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0) 497 m_tag_delete_chain(m, NULL); 498 KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__)); 499 KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__)); 500#ifdef INVARIANTS 501 trash_dtor(mem, size, arg); 502#endif 503} 504 505/* 506 * The Mbuf Packet zone destructor. 507 */ 508static void 509mb_dtor_pack(void *mem, int size, void *arg) 510{ 511 struct mbuf *m; 512 513 m = (struct mbuf *)mem; 514 if ((m->m_flags & M_PKTHDR) != 0) 515 m_tag_delete_chain(m, NULL); 516 517 /* Make sure we've got a clean cluster back. */ 518 KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__)); 519 KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__)); 520 KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__)); 521 KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__)); 522 KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__)); 523 KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__)); 524 KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__)); 525 KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__)); 526#ifdef INVARIANTS 527 trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg); 528#endif 529 /* 530 * If there are processes blocked on zone_clust, waiting for pages 531 * to be freed up, * cause them to be woken up by draining the 532 * packet zone. We are exposed to a race here * (in the check for 533 * the UMA_ZFLAG_FULL) where we might miss the flag set, but that 534 * is deliberate. We don't want to acquire the zone lock for every 535 * mbuf free. 536 */ 537 if (uma_zone_exhausted_nolock(zone_clust)) 538 zone_drain(zone_pack); 539} 540 541/* 542 * The Cluster and Jumbo[PAGESIZE|9|16] zone constructor. 543 * 544 * Here the 'arg' pointer points to the Mbuf which we 545 * are configuring cluster storage for. If 'arg' is 546 * empty we allocate just the cluster without setting 547 * the mbuf to it. See mbuf.h. 548 */ 549static int 550mb_ctor_clust(void *mem, int size, void *arg, int how) 551{ 552 struct mbuf *m; 553 u_int *refcnt; 554 int type; 555 uma_zone_t zone; 556 557#ifdef INVARIANTS 558 trash_ctor(mem, size, arg, how); 559#endif 560 switch (size) { 561 case MCLBYTES: 562 type = EXT_CLUSTER; 563 zone = zone_clust; 564 break; 565#if MJUMPAGESIZE != MCLBYTES 566 case MJUMPAGESIZE: 567 type = EXT_JUMBOP; 568 zone = zone_jumbop; 569 break; 570#endif 571 case MJUM9BYTES: 572 type = EXT_JUMBO9; 573 zone = zone_jumbo9; 574 break; 575 case MJUM16BYTES: 576 type = EXT_JUMBO16; 577 zone = zone_jumbo16; 578 break; 579 default: 580 panic("unknown cluster size"); 581 break; 582 } 583 584 m = (struct mbuf *)arg; 585 refcnt = uma_find_refcnt(zone, mem); 586 *refcnt = 1; 587 if (m != NULL) { 588 m->m_ext.ext_buf = (caddr_t)mem; 589 m->m_data = m->m_ext.ext_buf; 590 m->m_flags |= M_EXT; 591 m->m_ext.ext_free = NULL; 592 m->m_ext.ext_arg1 = NULL; 593 m->m_ext.ext_arg2 = NULL; 594 m->m_ext.ext_size = size; 595 m->m_ext.ext_type = type; 596 m->m_ext.ref_cnt = refcnt; 597 } 598 599 return (0); 600} 601 602/* 603 * The Mbuf Cluster zone destructor. 604 */ 605static void 606mb_dtor_clust(void *mem, int size, void *arg) 607{ 608#ifdef INVARIANTS 609 uma_zone_t zone; 610 611 zone = m_getzone(size); 612 KASSERT(*(uma_find_refcnt(zone, mem)) <= 1, 613 ("%s: refcnt incorrect %u", __func__, 614 *(uma_find_refcnt(zone, mem))) ); 615 616 trash_dtor(mem, size, arg); 617#endif 618} 619 620/* 621 * The Packet secondary zone's init routine, executed on the 622 * object's transition from mbuf keg slab to zone cache. 623 */ 624static int 625mb_zinit_pack(void *mem, int size, int how) 626{ 627 struct mbuf *m; 628 629 m = (struct mbuf *)mem; /* m is virgin. */ 630 if (uma_zalloc_arg(zone_clust, m, how) == NULL || 631 m->m_ext.ext_buf == NULL) 632 return (ENOMEM); 633 m->m_ext.ext_type = EXT_PACKET; /* Override. */ 634#ifdef INVARIANTS 635 trash_init(m->m_ext.ext_buf, MCLBYTES, how); 636#endif 637 return (0); 638} 639 640/* 641 * The Packet secondary zone's fini routine, executed on the 642 * object's transition from zone cache to keg slab. 643 */ 644static void 645mb_zfini_pack(void *mem, int size) 646{ 647 struct mbuf *m; 648 649 m = (struct mbuf *)mem; 650#ifdef INVARIANTS 651 trash_fini(m->m_ext.ext_buf, MCLBYTES); 652#endif 653 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL); 654#ifdef INVARIANTS 655 trash_dtor(mem, size, NULL); 656#endif 657} 658 659/* 660 * The "packet" keg constructor. 661 */ 662static int 663mb_ctor_pack(void *mem, int size, void *arg, int how) 664{ 665 struct mbuf *m; 666 struct mb_args *args; 667#ifdef MAC 668 int error; 669#endif 670 int flags; 671 short type; 672 673 m = (struct mbuf *)mem; 674 args = (struct mb_args *)arg; 675 flags = args->flags; 676 type = args->type; 677 678#ifdef INVARIANTS 679 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how); 680#endif 681 m->m_next = NULL; 682 m->m_nextpkt = NULL; 683 m->m_data = m->m_ext.ext_buf; 684 m->m_len = 0; 685 m->m_flags = (flags | M_EXT); 686 m->m_type = type; 687 688 if (flags & M_PKTHDR) { 689 m->m_pkthdr.rcvif = NULL; 690 m->m_pkthdr.len = 0; 691 m->m_pkthdr.header = NULL; 692 m->m_pkthdr.csum_flags = 0; 693 m->m_pkthdr.csum_data = 0; 694 m->m_pkthdr.tso_segsz = 0; 695 m->m_pkthdr.ether_vtag = 0; 696 m->m_pkthdr.flowid = 0; 697 SLIST_INIT(&m->m_pkthdr.tags); 698#ifdef MAC 699 /* If the label init fails, fail the alloc */ 700 error = mac_mbuf_init(m, how); 701 if (error) 702 return (error); 703#endif 704 } 705 /* m_ext is already initialized. */ 706 707 return (0); 708} 709 710int 711m_pkthdr_init(struct mbuf *m, int how) 712{ 713#ifdef MAC 714 int error; 715#endif 716 m->m_data = m->m_pktdat; 717 SLIST_INIT(&m->m_pkthdr.tags); 718 m->m_pkthdr.rcvif = NULL; 719 m->m_pkthdr.header = NULL; 720 m->m_pkthdr.len = 0; 721 m->m_pkthdr.flowid = 0; 722 m->m_pkthdr.csum_flags = 0; 723 m->m_pkthdr.csum_data = 0; 724 m->m_pkthdr.tso_segsz = 0; 725 m->m_pkthdr.ether_vtag = 0; 726#ifdef MAC 727 /* If the label init fails, fail the alloc */ 728 error = mac_mbuf_init(m, how); 729 if (error) 730 return (error); 731#endif 732 733 return (0); 734} 735 736/* 737 * This is the protocol drain routine. 738 * 739 * No locks should be held when this is called. The drain routines have to 740 * presently acquire some locks which raises the possibility of lock order 741 * reversal. 742 */ 743static void 744mb_reclaim(void *junk) 745{ 746 struct domain *dp; 747 struct protosw *pr; 748 749 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, 750 "mb_reclaim()"); 751 752 for (dp = domains; dp != NULL; dp = dp->dom_next) 753 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 754 if (pr->pr_drain != NULL) 755 (*pr->pr_drain)(); 756}
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