Cross Reference: /freebsd-10.2-release/sys/kern/kern

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kern_mbuf.c (243995)	kern_mbuf.c (243996)
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>	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: head/sys/kern/kern_mbuf.c 243995 2012-12-07 22:19:41Z pjd $");	29__FBSDID("$FreeBSD: head/sys/kern/kern_mbuf.c 243996 2012-12-07 22:22:04Z pjd $");
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 99int nmbufs; / limits number of mbufs / 100int nmbclusters; / limits number of mbuf clusters / 101int nmbjumbop; / limits number of page size jumbo clusters / 102int nmbjumbo9; / limits number of 9k jumbo clusters / 103int nmbjumbo16; / limits number of 16k jumbo clusters / 104struct mbstat mbstat; 105* 106/* 107 * tunable_mbinit() has to be run before init_maxsockets() thus 108 * the SYSINIT order below is SI_ORDER_MIDDLE while init_maxsockets() 109 * runs at SI_ORDER_ANY. 110 * 111 * NB: This has to be done before VM init. 112 / 113static void 114tunable_mbinit(void dummy) 115{ 116 117 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters); 118 if (nmbclusters == 0) 119 nmbclusters = maxmbufmem / MCLBYTES / 4; 120 121 TUNABLE_INT_FETCH("kern.ipc.nmbjumbop", &nmbjumbop); 122 if (nmbjumbop == 0) 123 nmbjumbop = maxmbufmem / MJUMPAGESIZE / 4; 124 125 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo9", &nmbjumbo9); 126 if (nmbjumbo9 == 0) 127 nmbjumbo9 = maxmbufmem / MJUM9BYTES / 6; 128 129 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo16", &nmbjumbo16); 130 if (nmbjumbo16 == 0) 131 nmbjumbo16 = maxmbufmem / MJUM16BYTES / 6; 132 133 /* 134 * We need at least as many mbufs as we have clusters of 135 * the various types added together. 136 / 137* TUNABLE_INT_FETCH("kern.ipc.nmbufs", &nmbufs); 138 if (nmbufs < nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) 139 nmbufs = lmax(maxmbufmem / MSIZE / 5,	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 99int nmbufs; / limits number of mbufs / 100int nmbclusters; / limits number of mbuf clusters / 101int nmbjumbop; / limits number of page size jumbo clusters / 102int nmbjumbo9; / limits number of 9k jumbo clusters / 103int nmbjumbo16; / limits number of 16k jumbo clusters / 104struct mbstat mbstat; 105* 106/* 107 * tunable_mbinit() has to be run before init_maxsockets() thus 108 * the SYSINIT order below is SI_ORDER_MIDDLE while init_maxsockets() 109 * runs at SI_ORDER_ANY. 110 * 111 * NB: This has to be done before VM init. 112 / 113static void 114tunable_mbinit(void dummy) 115{ 116 117 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters); 118 if (nmbclusters == 0) 119 nmbclusters = maxmbufmem / MCLBYTES / 4; 120 121 TUNABLE_INT_FETCH("kern.ipc.nmbjumbop", &nmbjumbop); 122 if (nmbjumbop == 0) 123 nmbjumbop = maxmbufmem / MJUMPAGESIZE / 4; 124 125 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo9", &nmbjumbo9); 126 if (nmbjumbo9 == 0) 127 nmbjumbo9 = maxmbufmem / MJUM9BYTES / 6; 128 129 TUNABLE_INT_FETCH("kern.ipc.nmbjumbo16", &nmbjumbo16); 130 if (nmbjumbo16 == 0) 131 nmbjumbo16 = maxmbufmem / MJUM16BYTES / 6; 132 133 /* 134 * We need at least as many mbufs as we have clusters of 135 * the various types added together. 136 / 137* TUNABLE_INT_FETCH("kern.ipc.nmbufs", &nmbufs); 138 if (nmbufs < nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) 139 nmbufs = lmax(maxmbufmem / MSIZE / 5,
140 nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16); 141	140 nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16);
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",	141} 142SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_mbinit, NULL); 143 144static int 145sysctl_nmbclusters(SYSCTL_HANDLER_ARGS) 146{ 147 int error, newnmbclusters; 148 149 newnmbclusters = nmbclusters; 150 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 151 if (error == 0 && req->newptr) { 152 if (newnmbclusters > nmbclusters && 153 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 154 nmbclusters = newnmbclusters; 155 uma_zone_set_max(zone_clust, nmbclusters); 156 nmbclusters = uma_zone_get_max(zone_clust); 157 EVENTHANDLER_INVOKE(nmbclusters_change); 158 } else 159 error = EINVAL; 160 } 161 return (error); 162} 163SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT\|CTLFLAG_RW, 164&nmbclusters, 0, sysctl_nmbclusters, "IU", 165 "Maximum number of mbuf clusters allowed"); 166 167static int 168sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS) 169{ 170 int error, newnmbjumbop; 171 172 newnmbjumbop = nmbjumbop; 173 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req); 174 if (error == 0 && req->newptr) { 175 if (newnmbjumbop > nmbjumbop && 176 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 177 nmbjumbop = newnmbjumbop; 178 uma_zone_set_max(zone_jumbop, nmbjumbop); 179 nmbjumbop = uma_zone_get_max(zone_jumbop); 180 } else 181 error = EINVAL; 182 } 183 return (error); 184} 185SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT\|CTLFLAG_RW, 186&nmbjumbop, 0, sysctl_nmbjumbop, "IU",
188 "Maximum number of mbuf page size jumbo clusters allowed");	187 "Maximum number of mbuf page size jumbo clusters allowed");
189 190static int 191sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS) 192{ 193 int error, newnmbjumbo9; 194 195 newnmbjumbo9 = nmbjumbo9; 196 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req); 197 if (error == 0 && req->newptr) { 198 if (newnmbjumbo9 > nmbjumbo9&& 199 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 200 nmbjumbo9 = newnmbjumbo9; 201 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 202 nmbjumbo9 = uma_zone_get_max(zone_jumbo9); 203 } else 204 error = EINVAL; 205 } 206 return (error); 207} 208SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT\|CTLFLAG_RW, 209&nmbjumbo9, 0, sysctl_nmbjumbo9, "IU", 210 "Maximum number of mbuf 9k jumbo clusters allowed"); 211 212static int 213sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS) 214{ 215 int error, newnmbjumbo16; 216 217 newnmbjumbo16 = nmbjumbo16; 218 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req); 219 if (error == 0 && req->newptr) { 220 if (newnmbjumbo16 > nmbjumbo16 && 221 nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) { 222 nmbjumbo16 = newnmbjumbo16; 223 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 224 nmbjumbo16 = uma_zone_get_max(zone_jumbo16); 225 } else 226 error = EINVAL; 227 } 228 return (error); 229} 230SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT\|CTLFLAG_RW, 231&nmbjumbo16, 0, sysctl_nmbjumbo16, "IU", 232 "Maximum number of mbuf 16k jumbo clusters allowed"); 233 234static int 235sysctl_nmbufs(SYSCTL_HANDLER_ARGS) 236{ 237 int error, newnmbufs; 238 239 newnmbufs = nmbufs; 240 error = sysctl_handle_int(oidp, &newnmbufs, 0, req); 241 if (error == 0 && req->newptr) { 242 if (newnmbufs > nmbufs) { 243 nmbufs = newnmbufs; 244 uma_zone_set_max(zone_mbuf, nmbufs); 245 nmbufs = uma_zone_get_max(zone_mbuf); 246 EVENTHANDLER_INVOKE(nmbufs_change); 247 } else 248 error = EINVAL; 249 } 250 return (error); 251} 252SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbuf, CTLTYPE_INT\|CTLFLAG_RW, 253&nmbufs, 0, sysctl_nmbufs, "IU", 254 "Maximum number of mbufs allowed"); 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*}	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); 244 nmbufs = uma_zone_get_max(zone_mbuf); 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 255SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, 256 "Mbuf general information and statistics"); 257 258/* 259 * Zones from which we allocate. 260 / 261uma_zone_t zone_mbuf; 262uma_zone_t zone_clust; 263uma_zone_t zone_pack; 264uma_zone_t zone_jumbop; 265uma_zone_t zone_jumbo9; 266uma_zone_t zone_jumbo16; 267uma_zone_t zone_ext_refcnt; 268* 269/* 270 * Local prototypes. 271 / 272static int mb_ctor_mbuf(void , int, void , int); 273static int mb_ctor_clust(void , int, void , int); 274static int mb_ctor_pack(void , int, void , int); 275static void mb_dtor_mbuf(void , int, void ); 276static void mb_dtor_clust(void , int, void ); 277static void mb_dtor_pack(void , int, void ); 278static int mb_zinit_pack(void , int, int); 279static void mb_zfini_pack(void , int); 280* 281static void mb_reclaim(void ); 282static void mbuf_init(void ); 283static void mbuf_jumbo_alloc(uma_zone_t, int, uint8_t , int); 284 285/* Ensure that MSIZE must be a power of 2. / 286CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); 287* 288/* 289 * Initialize FreeBSD Network buffer allocation. 290 / 291SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL); 292static void 293mbuf_init(void dummy) 294{ 295 296 /* 297 * Configure UMA zones for Mbufs, Clusters, and Packets. 298 / 299* zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, 300 mb_ctor_mbuf, mb_dtor_mbuf, 301#ifdef INVARIANTS 302 trash_init, trash_fini, 303#else 304 NULL, NULL, 305#endif 306 MSIZE - 1, UMA_ZONE_MAXBUCKET); 307 if (nmbufs > 0) { 308 uma_zone_set_max(zone_mbuf, nmbufs); 309 nmbufs = uma_zone_get_max(zone_mbuf); 310 } 311 312 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, 313 mb_ctor_clust, mb_dtor_clust, 314#ifdef INVARIANTS 315 trash_init, trash_fini, 316#else 317 NULL, NULL, 318#endif 319 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 320 if (nmbclusters > 0) { 321 uma_zone_set_max(zone_clust, nmbclusters); 322 nmbclusters = uma_zone_get_max(zone_clust); 323 } 324 325 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, 326 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); 327 328 /* Make jumbo frame zone too. Page size, 9k and 16k. / 329* zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE, 330 mb_ctor_clust, mb_dtor_clust, 331#ifdef INVARIANTS 332 trash_init, trash_fini, 333#else 334 NULL, NULL, 335#endif 336 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 337 if (nmbjumbop > 0) { 338 uma_zone_set_max(zone_jumbop, nmbjumbop); 339 nmbjumbop = uma_zone_get_max(zone_jumbop); 340 } 341 342 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, 343 mb_ctor_clust, mb_dtor_clust, 344#ifdef INVARIANTS 345 trash_init, trash_fini, 346#else 347 NULL, NULL, 348#endif 349 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 350 uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc); 351 if (nmbjumbo9 > 0) { 352 uma_zone_set_max(zone_jumbo9, nmbjumbo9); 353 nmbjumbo9 = uma_zone_get_max(zone_jumbo9); 354 } 355 356 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, 357 mb_ctor_clust, mb_dtor_clust, 358#ifdef INVARIANTS 359 trash_init, trash_fini, 360#else 361 NULL, NULL, 362#endif 363 UMA_ALIGN_PTR, UMA_ZONE_REFCNT); 364 uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc); 365 if (nmbjumbo16 > 0) { 366 uma_zone_set_max(zone_jumbo16, nmbjumbo16); 367 nmbjumbo16 = uma_zone_get_max(zone_jumbo16); 368 } 369 370 zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int), 371 NULL, NULL, 372 NULL, NULL, 373 UMA_ALIGN_PTR, UMA_ZONE_ZINIT); 374 375 /* uma_prealloc() goes here... / 376* 377 /* 378 * Hook event handler for low-memory situation, used to 379 * drain protocols and push data back to the caches (UMA 380 * later pushes it back to VM). 381 / 382* EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL, 383 EVENTHANDLER_PRI_FIRST); 384 385 /* 386 * [Re]set counters and local statistics knobs. 387 * XXX Some of these should go and be replaced, but UMA stat 388 * gathering needs to be revised. 389 / 390* mbstat.m_mbufs = 0; 391 mbstat.m_mclusts = 0; 392 mbstat.m_drain = 0; 393 mbstat.m_msize = MSIZE; 394 mbstat.m_mclbytes = MCLBYTES; 395 mbstat.m_minclsize = MINCLSIZE; 396 mbstat.m_mlen = MLEN; 397 mbstat.m_mhlen = MHLEN; 398 mbstat.m_numtypes = MT_NTYPES; 399 400 mbstat.m_mcfail = mbstat.m_mpfail = 0; 401 mbstat.sf_iocnt = 0; 402 mbstat.sf_allocwait = mbstat.sf_allocfail = 0; 403} 404 405/* 406 * UMA backend page allocator for the jumbo frame zones. 407 * 408 * Allocates kernel virtual memory that is backed by contiguous physical 409 * pages. 410 / 411static void 412mbuf_jumbo_alloc(uma_zone_t zone, int bytes, uint8_t flags, int wait) 413{ 414* 415 /* Inform UMA that this allocator uses kernel_map/object. / 416* flags = UMA_SLAB_KERNEL; 417* return ((void )kmem_alloc_contig(kernel_map, bytes, wait, 418* (vm_paddr_t)0, ~(vm_paddr_t)0, 1, 0, VM_MEMATTR_DEFAULT)); 419} 420 421/* 422 * Constructor for Mbuf master zone. 423 * 424 * The 'arg' pointer points to a mb_args structure which 425 * contains call-specific information required to support the 426 * mbuf allocation API. See mbuf.h. 427 / 428static int 429mb_ctor_mbuf(void mem, int size, void arg, int how) 430{ 431* struct mbuf m; 432* struct mb_args args; 433#ifdef MAC 434* int error; 435#endif 436 int flags; 437 short type; 438 439#ifdef INVARIANTS 440 trash_ctor(mem, size, arg, how); 441#endif 442 m = (struct mbuf )mem; 443* args = (struct mb_args )arg; 444* flags = args->flags; 445 type = args->type; 446 447 /* 448 * The mbuf is initialized later. The caller has the 449 * responsibility to set up any MAC labels too. 450 / 451* if (type == MT_NOINIT) 452 return (0); 453 454 m->m_next = NULL; 455 m->m_nextpkt = NULL; 456 m->m_len = 0; 457 m->m_flags = flags; 458 m->m_type = type; 459 if (flags & M_PKTHDR) { 460 m->m_data = m->m_pktdat; 461 m->m_pkthdr.rcvif = NULL; 462 m->m_pkthdr.header = NULL; 463 m->m_pkthdr.len = 0; 464 m->m_pkthdr.csum_flags = 0; 465 m->m_pkthdr.csum_data = 0; 466 m->m_pkthdr.tso_segsz = 0; 467 m->m_pkthdr.ether_vtag = 0; 468 m->m_pkthdr.flowid = 0; 469 SLIST_INIT(&m->m_pkthdr.tags); 470#ifdef MAC 471 /* If the label init fails, fail the alloc / 472* error = mac_mbuf_init(m, how); 473 if (error) 474 return (error); 475#endif 476 } else 477 m->m_data = m->m_dat; 478 return (0); 479} 480 481/* 482 * The Mbuf master zone destructor. 483 / 484static void 485mb_dtor_mbuf(void mem, int size, void arg) 486{ 487* struct mbuf m; 488* unsigned long flags; 489 490 m = (struct mbuf )mem; 491* flags = (unsigned long)arg; 492 493 if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0) 494 m_tag_delete_chain(m, NULL); 495 KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__)); 496 KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__)); 497#ifdef INVARIANTS 498 trash_dtor(mem, size, arg); 499#endif 500} 501 502/* 503 * The Mbuf Packet zone destructor. 504 / 505static void 506mb_dtor_pack(void mem, int size, void arg) 507{ 508* struct mbuf m; 509* 510 m = (struct mbuf )mem; 511* if ((m->m_flags & M_PKTHDR) != 0) 512 m_tag_delete_chain(m, NULL); 513 514 /* Make sure we've got a clean cluster back. / 515* KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__)); 516 KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__)); 517 KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__)); 518 KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__)); 519 KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__)); 520 KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__)); 521 KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__)); 522 KASSERT(m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__)); 523#ifdef INVARIANTS 524* trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg); 525#endif 526 /* 527 * If there are processes blocked on zone_clust, waiting for pages 528 * to be freed up, * cause them to be woken up by draining the 529 * packet zone. We are exposed to a race here * (in the check for 530 * the UMA_ZFLAG_FULL) where we might miss the flag set, but that 531 * is deliberate. We don't want to acquire the zone lock for every 532 * mbuf free. 533 / 534* if (uma_zone_exhausted_nolock(zone_clust)) 535 zone_drain(zone_pack); 536} 537 538/* 539 * The Cluster and Jumbo[PAGESIZE\|9\|16] zone constructor. 540 * 541 * Here the 'arg' pointer points to the Mbuf which we 542 * are configuring cluster storage for. If 'arg' is 543 * empty we allocate just the cluster without setting 544 * the mbuf to it. See mbuf.h. 545 / 546static int 547mb_ctor_clust(void mem, int size, void arg, int how) 548{ 549* struct mbuf m; 550* u_int refcnt; 551* int type; 552 uma_zone_t zone; 553 554#ifdef INVARIANTS 555 trash_ctor(mem, size, arg, how); 556#endif 557 switch (size) { 558 case MCLBYTES: 559 type = EXT_CLUSTER; 560 zone = zone_clust; 561 break; 562#if MJUMPAGESIZE != MCLBYTES 563 case MJUMPAGESIZE: 564 type = EXT_JUMBOP; 565 zone = zone_jumbop; 566 break; 567#endif 568 case MJUM9BYTES: 569 type = EXT_JUMBO9; 570 zone = zone_jumbo9; 571 break; 572 case MJUM16BYTES: 573 type = EXT_JUMBO16; 574 zone = zone_jumbo16; 575 break; 576 default: 577 panic("unknown cluster size"); 578 break; 579 } 580 581 m = (struct mbuf )arg; 582* refcnt = uma_find_refcnt(zone, mem); 583 refcnt = 1; 584* if (m != NULL) { 585 m->m_ext.ext_buf = (caddr_t)mem; 586 m->m_data = m->m_ext.ext_buf; 587 m->m_flags \|= M_EXT; 588 m->m_ext.ext_free = NULL; 589 m->m_ext.ext_arg1 = NULL; 590 m->m_ext.ext_arg2 = NULL; 591 m->m_ext.ext_size = size; 592 m->m_ext.ext_type = type; 593 m->m_ext.ref_cnt = refcnt; 594 } 595 596 return (0); 597} 598 599/* 600 * The Mbuf Cluster zone destructor. 601 / 602static void 603mb_dtor_clust(void mem, int size, void arg) 604{ 605#ifdef INVARIANTS 606* uma_zone_t zone; 607 608 zone = m_getzone(size); 609 KASSERT((uma_find_refcnt(zone, mem)) <= 1, 610* ("%s: refcnt incorrect %u", __func__, 611 (uma_find_refcnt(zone, mem))) ); 612* 613 trash_dtor(mem, size, arg); 614#endif 615} 616 617/* 618 * The Packet secondary zone's init routine, executed on the 619 * object's transition from mbuf keg slab to zone cache. 620 / 621static int 622mb_zinit_pack(void mem, int size, int how) 623{ 624 struct mbuf m; 625* 626 m = (struct mbuf )mem; / m is virgin. / 627* if (uma_zalloc_arg(zone_clust, m, how) == NULL \|\| 628 m->m_ext.ext_buf == NULL) 629 return (ENOMEM); 630 m->m_ext.ext_type = EXT_PACKET; /* Override. / 631#ifdef INVARIANTS 632* trash_init(m->m_ext.ext_buf, MCLBYTES, how); 633#endif 634 return (0); 635} 636 637/* 638 * The Packet secondary zone's fini routine, executed on the 639 * object's transition from zone cache to keg slab. 640 / 641static void 642mb_zfini_pack(void mem, int size) 643{ 644 struct mbuf m; 645* 646 m = (struct mbuf )mem; 647#ifdef INVARIANTS 648* trash_fini(m->m_ext.ext_buf, MCLBYTES); 649#endif 650 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL); 651#ifdef INVARIANTS 652 trash_dtor(mem, size, NULL); 653#endif 654} 655 656/* 657 * The "packet" keg constructor. 658 / 659static int 660mb_ctor_pack(void mem, int size, void arg, int how) 661{ 662* struct mbuf m; 663* struct mb_args args; 664#ifdef MAC 665* int error; 666#endif 667 int flags; 668 short type; 669 670 m = (struct mbuf )mem; 671* args = (struct mb_args )arg; 672* flags = args->flags; 673 type = args->type; 674 675#ifdef INVARIANTS 676 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how); 677#endif 678 m->m_next = NULL; 679 m->m_nextpkt = NULL; 680 m->m_data = m->m_ext.ext_buf; 681 m->m_len = 0; 682 m->m_flags = (flags \| M_EXT); 683 m->m_type = type; 684 685 if (flags & M_PKTHDR) { 686 m->m_pkthdr.rcvif = NULL; 687 m->m_pkthdr.len = 0; 688 m->m_pkthdr.header = NULL; 689 m->m_pkthdr.csum_flags = 0; 690 m->m_pkthdr.csum_data = 0; 691 m->m_pkthdr.tso_segsz = 0; 692 m->m_pkthdr.ether_vtag = 0; 693 m->m_pkthdr.flowid = 0; 694 SLIST_INIT(&m->m_pkthdr.tags); 695#ifdef MAC 696 /* If the label init fails, fail the alloc / 697* error = mac_mbuf_init(m, how); 698 if (error) 699 return (error); 700#endif 701 } 702 /* m_ext is already initialized. / 703* 704 return (0); 705} 706 707int 708m_pkthdr_init(struct mbuf m, int how) 709{ 710#ifdef MAC 711* int error; 712#endif 713 m->m_data = m->m_pktdat; 714 SLIST_INIT(&m->m_pkthdr.tags); 715 m->m_pkthdr.rcvif = NULL; 716 m->m_pkthdr.header = NULL; 717 m->m_pkthdr.len = 0; 718 m->m_pkthdr.flowid = 0; 719 m->m_pkthdr.csum_flags = 0; 720 m->m_pkthdr.csum_data = 0; 721 m->m_pkthdr.tso_segsz = 0; 722 m->m_pkthdr.ether_vtag = 0; 723#ifdef MAC 724 /* If the label init fails, fail the alloc / 725* error = mac_mbuf_init(m, how); 726 if (error) 727 return (error); 728#endif 729 730 return (0); 731} 732 733/* 734 * This is the protocol drain routine. 735 * 736 * No locks should be held when this is called. The drain routines have to 737 * presently acquire some locks which raises the possibility of lock order 738 * reversal. 739 / 740static void 741mb_reclaim(void junk) 742{ 743 struct domain dp; 744* struct protosw pr; 745* 746 WITNESS_WARN(WARN_GIANTOK \| WARN_SLEEPOK \| WARN_PANIC, NULL, 747 "mb_reclaim()"); 748 749 for (dp = domains; dp != NULL; dp = dp->dom_next) 750 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) 751 if (pr->pr_drain != NULL) 752 (pr->pr_drain)(); 753*}