9e06a1e05a
nextpkt within the m_hdr was not being initialized to NULL for !M_PKTHDR cases. *Maybe* this will fix weird socket buffer inconsistency panics, but we'll see.
384 lines
10 KiB
C
384 lines
10 KiB
C
/*-
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* Copyright (c) 2004
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* Bosko Milekic <bmilekic@FreeBSD.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include "opt_param.h"
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#include <sys/param.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/protosw.h>
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#include <sys/smp.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/uma.h>
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/*
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* In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA
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* Zones.
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*
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* Mbuf Clusters (2K, contiguous) are allocated from the Cluster
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* Zone. The Zone can be capped at kern.ipc.nmbclusters, if the
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* administrator so desires.
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*
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* Mbufs are allocated from a UMA Master Zone called the Mbuf
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* Zone.
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*
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* Additionally, FreeBSD provides a Packet Zone, which it
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* configures as a Secondary Zone to the Mbuf Master Zone,
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* thus sharing backend Slab kegs with the Mbuf Master Zone.
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*
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* Thus common-case allocations and locking are simplified:
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*
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* m_clget() m_getcl()
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* | |
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* | .------------>[(Packet Cache)] m_get(), m_gethdr()
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* | | [ Packet ] |
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* [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ]
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* [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ]
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* | \________ |
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* [ Cluster Keg ] \ /
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* | [ Mbuf Keg ]
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* [ Cluster Slabs ] |
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* | [ Mbuf Slabs ]
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* \____________(VM)_________________/
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*/
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int nmbclusters;
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struct mbstat mbstat;
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static void
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tunable_mbinit(void *dummy)
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{
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/* This has to be done before VM init. */
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nmbclusters = 1024 + maxusers * 64;
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TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters);
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}
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SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_ANY, tunable_mbinit, NULL);
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SYSCTL_DECL(_kern_ipc);
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SYSCTL_INT(_kern_ipc, OID_AUTO, nmbclusters, CTLFLAG_RW, &nmbclusters, 0,
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"Maximum number of mbuf clusters allowed");
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SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat,
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"Mbuf general information and statistics");
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/*
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* Zones from which we allocate.
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*/
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uma_zone_t zone_mbuf;
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uma_zone_t zone_clust;
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uma_zone_t zone_pack;
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/*
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* Local prototypes.
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*/
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static void mb_ctor_mbuf(void *, int, void *);
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static void mb_ctor_clust(void *, int, void *);
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static void mb_ctor_pack(void *, int, void *);
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static void mb_dtor_mbuf(void *, int, void *);
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static void mb_dtor_clust(void *, int, void *); /* XXX */
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static void mb_dtor_pack(void *, int, void *); /* XXX */
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static void mb_init_pack(void *, int);
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static void mb_fini_pack(void *, int);
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static void mb_reclaim(void *);
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static void mbuf_init(void *);
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/*
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* Initialize FreeBSD Network buffer allocation.
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*/
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SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL)
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static void
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mbuf_init(void *dummy)
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{
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/*
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* Configure UMA zones for Mbufs, Clusters, and Packets.
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*/
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zone_mbuf = uma_zcreate("Mbuf", MSIZE, mb_ctor_mbuf, mb_dtor_mbuf,
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NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_MAXBUCKET);
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zone_clust = uma_zcreate("MbufClust", MCLBYTES, mb_ctor_clust,
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mb_dtor_clust, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
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if (nmbclusters > 0)
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uma_zone_set_max(zone_clust, nmbclusters);
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zone_pack = uma_zsecond_create("Packet", mb_ctor_pack, mb_dtor_pack,
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mb_init_pack, mb_fini_pack, zone_mbuf);
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/* uma_prealloc() goes here */
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/*
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* Hook event handler for low-memory situation, used to
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* drain protocols and push data back to the caches (UMA
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* later pushes it back to VM).
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*/
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EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL,
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EVENTHANDLER_PRI_FIRST);
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/*
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* [Re]set counters and local statistics knobs.
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* XXX Some of these should go and be replaced, but UMA stat
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* gathering needs to be revised.
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*/
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mbstat.m_mbufs = 0;
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mbstat.m_mclusts = 0;
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mbstat.m_drain = 0;
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mbstat.m_msize = MSIZE;
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mbstat.m_mclbytes = MCLBYTES;
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mbstat.m_minclsize = MINCLSIZE;
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mbstat.m_mlen = MLEN;
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mbstat.m_mhlen = MHLEN;
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mbstat.m_numtypes = MT_NTYPES;
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mbstat.m_mcfail = mbstat.m_mpfail = 0;
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mbstat.sf_iocnt = 0;
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mbstat.sf_allocwait = mbstat.sf_allocfail = 0;
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}
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/*
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* Constructor for Mbuf master zone.
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*
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* The 'arg' pointer points to a mb_args structure which
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* contains call-specific information required to support the
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* mbuf allocation API.
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*/
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static void
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mb_ctor_mbuf(void *mem, int size, void *arg)
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{
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struct mbuf *m;
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struct mb_args *args;
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int flags;
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int how;
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short type;
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m = (struct mbuf *)mem;
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args = (struct mb_args *)arg;
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flags = args->flags;
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how = args->how;
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type = args->type;
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m->m_type = type;
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m->m_next = NULL;
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m->m_nextpkt = NULL;
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m->m_flags = flags;
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if (flags & M_PKTHDR) {
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m->m_data = m->m_pktdat;
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m->m_pkthdr.rcvif = NULL;
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m->m_pkthdr.csum_flags = 0;
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SLIST_INIT(&m->m_pkthdr.tags);
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#ifdef MAC
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/* If the label init fails, fail the alloc */
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if (mac_init_mbuf(m, how) != 0) {
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m_free(m);
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/* XXX*/ panic("mb_ctor_mbuf(): can't deal with failure!");
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/* return 0; */
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}
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#endif
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} else
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m->m_data = m->m_dat;
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mbstat.m_mbufs += 1; /* XXX */
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/* return 1;
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*/
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}
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/*
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* The Mbuf master zone and Packet secondary zone destructor.
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*/
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static void
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mb_dtor_mbuf(void *mem, int size, void *arg)
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{
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struct mbuf *m;
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m = (struct mbuf *)mem;
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if ((m->m_flags & M_PKTHDR) != 0)
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m_tag_delete_chain(m, NULL);
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mbstat.m_mbufs -= 1; /* XXX */
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}
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/* XXX Only because of stats */
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static void
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mb_dtor_pack(void *mem, int size, void *arg)
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{
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struct mbuf *m;
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m = (struct mbuf *)mem;
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if ((m->m_flags & M_PKTHDR) != 0)
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m_tag_delete_chain(m, NULL);
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mbstat.m_mbufs -= 1; /* XXX */
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mbstat.m_mclusts -= 1; /* XXX */
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}
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/*
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* The Cluster zone constructor.
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*
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* Here the 'arg' pointer points to the Mbuf which we
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* are configuring cluster storage for.
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*/
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static void
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mb_ctor_clust(void *mem, int size, void *arg)
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{
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struct mbuf *m;
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m = (struct mbuf *)arg;
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m->m_ext.ext_buf = (caddr_t)mem;
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m->m_data = m->m_ext.ext_buf;
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m->m_flags |= M_EXT;
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m->m_ext.ext_free = NULL;
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m->m_ext.ext_args = NULL;
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m->m_ext.ext_size = MCLBYTES;
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m->m_ext.ext_type = EXT_CLUSTER;
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m->m_ext.ref_cnt = (u_int *)uma_find_refcnt(zone_clust,
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m->m_ext.ext_buf);
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*(m->m_ext.ref_cnt) = 1;
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mbstat.m_mclusts += 1; /* XXX */
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/* return 1;
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*/
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}
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/* XXX */
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static void
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mb_dtor_clust(void *mem, int size, void *arg)
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{
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mbstat.m_mclusts -= 1; /* XXX */
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}
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/*
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* The Packet secondary zone's init routine, executed on the
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* object's transition from keg slab to zone cache.
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*/
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static void
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mb_init_pack(void *mem, int size)
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{
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struct mbuf *m;
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m = (struct mbuf *)mem;
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m->m_ext.ext_buf = NULL;
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uma_zalloc_arg(zone_clust, m, M_NOWAIT);
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if (m->m_ext.ext_buf == NULL) /* XXX */
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panic("mb_init_pack(): Can't deal with failure yet.");
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mbstat.m_mclusts -= 1; /* XXX */
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}
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/*
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* The Packet secondary zone's fini routine, executed on the
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* object's transition from zone cache to keg slab.
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*/
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static void
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mb_fini_pack(void *mem, int size)
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{
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struct mbuf *m;
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m = (struct mbuf *)mem;
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uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL);
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m->m_ext.ext_buf = NULL;
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mbstat.m_mclusts += 1; /* XXX */
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}
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/*
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* The "packet" keg constructor.
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*/
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static void
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mb_ctor_pack(void *mem, int size, void *arg)
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{
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struct mbuf *m;
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struct mb_args *args;
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int flags, how;
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short type;
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m = (struct mbuf *)mem;
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args = (struct mb_args *)arg;
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flags = args->flags;
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type = args->type;
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how = args->how;
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m->m_type = type;
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m->m_next = NULL;
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m->m_nextpkt = NULL;
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m->m_data = m->m_ext.ext_buf;
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m->m_flags = flags|M_EXT;
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m->m_ext.ext_free = NULL;
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m->m_ext.ext_args = NULL;
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m->m_ext.ext_size = MCLBYTES;
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m->m_ext.ext_type = EXT_PACKET;
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*(m->m_ext.ref_cnt) = 1;
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if (flags & M_PKTHDR) {
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m->m_pkthdr.rcvif = NULL;
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m->m_pkthdr.csum_flags = 0;
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SLIST_INIT(&m->m_pkthdr.tags);
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#ifdef MAC
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/* If the label init fails, fail the alloc */
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if (mac_init_mbuf(m, how) != 0) {
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m_free(m);
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/* XXX*/ panic("mb_ctor_pack(): can't deal with failure!");
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/* return 0; */
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}
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#endif
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}
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mbstat.m_mbufs += 1; /* XXX */
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mbstat.m_mclusts += 1; /* XXX */
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/* return 1;
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*/
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}
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/*
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* This is the protocol drain routine.
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*
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* No locks should be held when this is called. The drain routines have to
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* presently acquire some locks which raises the possibility of lock order
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* reversal.
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*/
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static void
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mb_reclaim(void *junk)
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{
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struct domain *dp;
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struct protosw *pr;
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL,
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"mb_reclaim()");
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mbstat.m_drain++;
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for (dp = domains; dp != NULL; dp = dp->dom_next)
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_drain != NULL)
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(*pr->pr_drain)();
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}
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