/*- * Copyright (c) 2004, 2005, * Bosko Milekic . All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice unmodified, this list of conditions and the following * disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include "opt_mac.h" #include "opt_param.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA * Zones. * * Mbuf Clusters (2K, contiguous) are allocated from the Cluster * Zone. The Zone can be capped at kern.ipc.nmbclusters, if the * administrator so desires. * * Mbufs are allocated from a UMA Master Zone called the Mbuf * Zone. * * Additionally, FreeBSD provides a Packet Zone, which it * configures as a Secondary Zone to the Mbuf Master Zone, * thus sharing backend Slab kegs with the Mbuf Master Zone. * * Thus common-case allocations and locking are simplified: * * m_clget() m_getcl() * | | * | .------------>[(Packet Cache)] m_get(), m_gethdr() * | | [ Packet ] | * [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ] * [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ] * | \________ | * [ Cluster Keg ] \ / * | [ Mbuf Keg ] * [ Cluster Slabs ] | * | [ Mbuf Slabs ] * \____________(VM)_________________/ * * * Whenever a object is allocated with uma_zalloc() out of the * one of the Zones its _ctor_ function is executed. The same * for any deallocation through uma_zfree() the _dror_ function * is executed. * * Caches are per-CPU and are filled from the Master Zone. * * Whenever a object is allocated from the underlying global * memory pool it gets pre-initialized with the _zinit_ functions. * When the Keg's are overfull objects get decomissioned with * _zfini_ functions and free'd back to the global memory pool. * */ int nmbclusters; /* limits number of mbuf clusters */ int nmbjumbo9; /* limits number of 9k jumbo clusters */ int nmbjumbo16; /* limits number of 16k jumbo clusters */ struct mbstat mbstat; static void tunable_mbinit(void *dummy) { /* This has to be done before VM init. */ nmbclusters = 1024 + maxusers * 64; TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters); } SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_ANY, tunable_mbinit, NULL); SYSCTL_DECL(_kern_ipc); /* XXX: These should be tuneables. Can't change UMA limits on the fly. */ SYSCTL_INT(_kern_ipc, OID_AUTO, nmbclusters, CTLFLAG_RW, &nmbclusters, 0, "Maximum number of mbuf clusters allowed"); SYSCTL_INT(_kern_ipc, OID_AUTO, nmbjumbo9, CTLFLAG_RW, &nmbjumbo9, 0, "Maximum number of mbuf 9k jumbo clusters allowed"); SYSCTL_INT(_kern_ipc, OID_AUTO, nmbjumbo16, CTLFLAG_RW, &nmbjumbo16, 0, "Maximum number of mbuf 16k jumbo clusters allowed"); SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat, "Mbuf general information and statistics"); /* * Zones from which we allocate. */ uma_zone_t zone_mbuf; uma_zone_t zone_clust; uma_zone_t zone_pack; uma_zone_t zone_jumbo9; uma_zone_t zone_jumbo16; uma_zone_t zone_ext_refcnt; /* * Local prototypes. */ static int mb_ctor_mbuf(void *, int, void *, int); static int mb_ctor_clust(void *, int, void *, int); static int mb_ctor_pack(void *, int, void *, int); static void mb_dtor_mbuf(void *, int, void *); static void mb_dtor_clust(void *, int, void *); static void mb_dtor_pack(void *, int, void *); static int mb_zinit_pack(void *, int, int); static void mb_zfini_pack(void *, int); static void mb_reclaim(void *); static void mbuf_init(void *); /* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */ CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); /* * Initialize FreeBSD Network buffer allocation. */ SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL) static void mbuf_init(void *dummy) { /* * Configure UMA zones for Mbufs, Clusters, and Packets. */ zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE, mb_ctor_mbuf, mb_dtor_mbuf, #ifdef INVARIANTS trash_init, trash_fini, #else NULL, NULL, #endif MSIZE - 1, UMA_ZONE_MAXBUCKET); zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES, mb_ctor_clust, mb_dtor_clust, #ifdef INVARIANTS trash_init, trash_fini, #else NULL, NULL, #endif UMA_ALIGN_PTR, UMA_ZONE_REFCNT); if (nmbclusters > 0) uma_zone_set_max(zone_clust, nmbclusters); zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack, mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf); /* Make jumbo frame zone too. 9k and 16k. */ zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES, mb_ctor_clust, mb_dtor_clust, #ifdef INVARIANTS trash_init, trash_fini, #else NULL, NULL, #endif UMA_ALIGN_PTR, UMA_ZONE_REFCNT); if (nmbjumbo9 > 0) uma_zone_set_max(zone_jumbo9, nmbjumbo9); zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES, mb_ctor_clust, mb_dtor_clust, #ifdef INVARIANTS trash_init, trash_fini, #else NULL, NULL, #endif UMA_ALIGN_PTR, UMA_ZONE_REFCNT); if (nmbjumbo16 > 0) uma_zone_set_max(zone_jumbo16, nmbjumbo16); zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_ZINIT); /* uma_prealloc() goes here... */ /* * Hook event handler for low-memory situation, used to * drain protocols and push data back to the caches (UMA * later pushes it back to VM). */ EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL, EVENTHANDLER_PRI_FIRST); /* * [Re]set counters and local statistics knobs. * XXX Some of these should go and be replaced, but UMA stat * gathering needs to be revised. */ mbstat.m_mbufs = 0; mbstat.m_mclusts = 0; mbstat.m_drain = 0; mbstat.m_msize = MSIZE; mbstat.m_mclbytes = MCLBYTES; mbstat.m_minclsize = MINCLSIZE; mbstat.m_mlen = MLEN; mbstat.m_mhlen = MHLEN; mbstat.m_numtypes = MT_NTYPES; mbstat.m_mcfail = mbstat.m_mpfail = 0; mbstat.sf_iocnt = 0; mbstat.sf_allocwait = mbstat.sf_allocfail = 0; } /* * Constructor for Mbuf master zone. * * The 'arg' pointer points to a mb_args structure which * contains call-specific information required to support the * mbuf allocation API. See mbuf.h. */ static int mb_ctor_mbuf(void *mem, int size, void *arg, int how) { struct mbuf *m; struct mb_args *args; #ifdef MAC int error; #endif int flags; short type; #ifdef INVARIANTS trash_ctor(mem, size, arg, how); #endif m = (struct mbuf *)mem; args = (struct mb_args *)arg; flags = args->flags; type = args->type; /* * The mbuf is initialized later. The caller has the * responseability to setup any MAC labels too. */ if (type == MT_NOINIT) return (0); m->m_next = NULL; m->m_nextpkt = NULL; m->m_len = 0; m->m_flags = flags; m->m_type = type; if (flags & M_PKTHDR) { m->m_data = m->m_pktdat; m->m_pkthdr.rcvif = NULL; m->m_pkthdr.len = 0; m->m_pkthdr.header = NULL; m->m_pkthdr.csum_flags = 0; m->m_pkthdr.csum_data = 0; SLIST_INIT(&m->m_pkthdr.tags); #ifdef MAC /* If the label init fails, fail the alloc */ error = mac_init_mbuf(m, how); if (error) return (error); #endif } else m->m_data = m->m_dat; return (0); } /* * The Mbuf master zone destructor. */ static void mb_dtor_mbuf(void *mem, int size, void *arg) { struct mbuf *m; m = (struct mbuf *)mem; if ((m->m_flags & M_PKTHDR) != 0) m_tag_delete_chain(m, NULL); KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__)); #ifdef INVARIANTS trash_dtor(mem, size, arg); #endif } /* * The Mbuf Packet zone destructor. */ static void mb_dtor_pack(void *mem, int size, void *arg) { struct mbuf *m; m = (struct mbuf *)mem; if ((m->m_flags & M_PKTHDR) != 0) m_tag_delete_chain(m, NULL); /* Make sure we've got a clean cluster back. */ KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__)); KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__)); KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__)); KASSERT(m->m_ext.ext_args == NULL, ("%s: ext_args != NULL", __func__)); KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__)); KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_CLUSTER", __func__)); KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__)); #ifdef INVARIANTS trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg); #endif } /* * The Cluster and Jumbo[9|16] zone constructor. * * Here the 'arg' pointer points to the Mbuf which we * are configuring cluster storage for. If 'arg' is * empty we allocate just the cluster without setting * the mbuf to it. See mbuf.h. */ static int mb_ctor_clust(void *mem, int size, void *arg, int how) { struct mbuf *m; u_int *refcnt; int type = 0; #ifdef INVARIANTS trash_ctor(mem, size, arg, how); #endif m = (struct mbuf *)arg; if (m != NULL) { switch (size) { case MCLBYTES: type = EXT_CLUSTER; break; case MJUM9BYTES: type = EXT_JUMBO9; break; case MJUM16BYTES: type = EXT_JUMBO16; break; default: panic("unknown cluster size"); break; } m->m_ext.ext_buf = (caddr_t)mem; m->m_data = m->m_ext.ext_buf; m->m_flags |= M_EXT; m->m_ext.ext_free = NULL; m->m_ext.ext_args = NULL; m->m_ext.ext_size = size; m->m_ext.ext_type = type; m->m_ext.ref_cnt = uma_find_refcnt(zone_clust, mem); *m->m_ext.ref_cnt = 1; } else { refcnt = uma_find_refcnt(zone_clust, mem); *refcnt = 1; } return (0); } /* * The Mbuf Cluster zone destructor. */ static void mb_dtor_clust(void *mem, int size, void *arg) { KASSERT(*(uma_find_refcnt(zone_clust, mem)) <= 1, ("%s: refcnt incorrect %u", __func__, *(uma_find_refcnt(zone_clust, mem))) ); #ifdef INVARIANTS trash_dtor(mem, size, arg); #endif } /* * The Packet secondary zone's init routine, executed on the * object's transition from mbuf keg slab to zone cache. */ static int mb_zinit_pack(void *mem, int size, int how) { struct mbuf *m; m = (struct mbuf *)mem; /* m is virgin. */ uma_zalloc_arg(zone_clust, m, how); if (m->m_ext.ext_buf == NULL) return (ENOMEM); m->m_ext.ext_type = EXT_PACKET; /* Override. */ #ifdef INVARIANTS trash_init(m->m_ext.ext_buf, MCLBYTES, how); #endif return (0); } /* * The Packet secondary zone's fini routine, executed on the * object's transition from zone cache to keg slab. */ static void mb_zfini_pack(void *mem, int size) { struct mbuf *m; m = (struct mbuf *)mem; #ifdef INVARIANTS trash_fini(m->m_ext.ext_buf, MCLBYTES); #endif uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL); #ifdef INVARIANTS trash_dtor(mem, size, NULL); #endif } /* * The "packet" keg constructor. */ static int mb_ctor_pack(void *mem, int size, void *arg, int how) { struct mbuf *m; struct mb_args *args; #ifdef MAC int error; #endif int flags; short type; m = (struct mbuf *)mem; args = (struct mb_args *)arg; flags = args->flags; type = args->type; #ifdef INVARIANTS trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how); #endif m->m_next = NULL; m->m_nextpkt = NULL; m->m_data = m->m_ext.ext_buf; m->m_len = 0; m->m_flags = (flags | M_EXT); m->m_type = type; if (flags & M_PKTHDR) { m->m_pkthdr.rcvif = NULL; m->m_pkthdr.len = 0; m->m_pkthdr.header = NULL; m->m_pkthdr.csum_flags = 0; m->m_pkthdr.csum_data = 0; SLIST_INIT(&m->m_pkthdr.tags); #ifdef MAC /* If the label init fails, fail the alloc */ error = mac_init_mbuf(m, how); if (error) return (error); #endif } /* m_ext is already initialized. */ return (0); } /* * This is the protocol drain routine. * * No locks should be held when this is called. The drain routines have to * presently acquire some locks which raises the possibility of lock order * reversal. */ static void mb_reclaim(void *junk) { struct domain *dp; struct protosw *pr; WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL, "mb_reclaim()"); for (dp = domains; dp != NULL; dp = dp->dom_next) for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) if (pr->pr_drain != NULL) (*pr->pr_drain)(); }