695 lines
18 KiB
C
695 lines
18 KiB
C
/*-
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* Copyright (c) 2004, 2005,
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* Bosko Milekic <bmilekic@FreeBSD.org>. 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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*
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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_param.h"
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#include <sys/param.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 <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_page.h>
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#include <vm/uma.h>
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#include <vm/uma_int.h>
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#include <vm/uma_dbg.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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*
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* Whenever an object is allocated with uma_zalloc() out of
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* one of the Zones its _ctor_ function is executed. The same
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* for any deallocation through uma_zfree() the _dtor_ function
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* is executed.
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*
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* Caches are per-CPU and are filled from the Master Zone.
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*
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* Whenever an object is allocated from the underlying global
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* memory pool it gets pre-initialized with the _zinit_ functions.
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* When the Keg's are overfull objects get decomissioned with
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* _zfini_ functions and free'd back to the global memory pool.
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*
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*/
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int nmbclusters; /* limits number of mbuf clusters */
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int nmbjumbop; /* limits number of page size jumbo clusters */
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int nmbjumbo9; /* limits number of 9k jumbo clusters */
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int nmbjumbo16; /* limits number of 16k jumbo clusters */
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struct mbstat mbstat;
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/*
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* tunable_mbinit() has to be run before init_maxsockets() thus
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* the SYSINIT order below is SI_ORDER_MIDDLE while init_maxsockets()
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* runs at SI_ORDER_ANY.
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*/
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static void
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tunable_mbinit(void *dummy)
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{
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TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters);
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/* This has to be done before VM init. */
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if (nmbclusters == 0)
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nmbclusters = 1024 + maxusers * 64;
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nmbjumbop = nmbclusters / 2;
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nmbjumbo9 = nmbjumbop / 2;
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nmbjumbo16 = nmbjumbo9 / 2;
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}
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SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_mbinit, NULL);
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static int
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sysctl_nmbclusters(SYSCTL_HANDLER_ARGS)
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{
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int error, newnmbclusters;
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newnmbclusters = nmbclusters;
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error = sysctl_handle_int(oidp, &newnmbclusters, 0, req);
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if (error == 0 && req->newptr) {
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if (newnmbclusters > nmbclusters) {
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nmbclusters = newnmbclusters;
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uma_zone_set_max(zone_clust, nmbclusters);
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EVENTHANDLER_INVOKE(nmbclusters_change);
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} else
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error = EINVAL;
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}
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return (error);
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}
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SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW,
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&nmbclusters, 0, sysctl_nmbclusters, "IU",
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"Maximum number of mbuf clusters allowed");
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static int
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sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS)
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{
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int error, newnmbjumbop;
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newnmbjumbop = nmbjumbop;
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error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req);
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if (error == 0 && req->newptr) {
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if (newnmbjumbop> nmbjumbop) {
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nmbjumbop = newnmbjumbop;
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uma_zone_set_max(zone_jumbop, nmbjumbop);
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} else
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error = EINVAL;
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}
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return (error);
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}
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SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW,
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&nmbjumbop, 0, sysctl_nmbjumbop, "IU",
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"Maximum number of mbuf page size jumbo clusters allowed");
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static int
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sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS)
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{
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int error, newnmbjumbo9;
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newnmbjumbo9 = nmbjumbo9;
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error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req);
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if (error == 0 && req->newptr) {
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if (newnmbjumbo9> nmbjumbo9) {
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nmbjumbo9 = newnmbjumbo9;
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uma_zone_set_max(zone_jumbo9, nmbjumbo9);
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} else
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error = EINVAL;
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}
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return (error);
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}
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SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW,
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&nmbjumbo9, 0, sysctl_nmbjumbo9, "IU",
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"Maximum number of mbuf 9k jumbo clusters allowed");
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static int
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sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS)
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{
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int error, newnmbjumbo16;
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newnmbjumbo16 = nmbjumbo16;
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error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req);
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if (error == 0 && req->newptr) {
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if (newnmbjumbo16> nmbjumbo16) {
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nmbjumbo16 = newnmbjumbo16;
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uma_zone_set_max(zone_jumbo16, nmbjumbo16);
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} else
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error = EINVAL;
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}
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return (error);
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}
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SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW,
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&nmbjumbo16, 0, sysctl_nmbjumbo16, "IU",
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"Maximum number of mbuf 16k jumbo 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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uma_zone_t zone_jumbop;
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uma_zone_t zone_jumbo9;
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uma_zone_t zone_jumbo16;
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uma_zone_t zone_ext_refcnt;
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/*
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* Local prototypes.
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*/
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static int mb_ctor_mbuf(void *, int, void *, int);
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static int mb_ctor_clust(void *, int, void *, int);
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static int mb_ctor_pack(void *, int, void *, int);
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static void mb_dtor_mbuf(void *, int, void *);
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static void mb_dtor_clust(void *, int, void *);
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static void mb_dtor_pack(void *, int, void *);
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static int mb_zinit_pack(void *, int, int);
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static void mb_zfini_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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static void *mbuf_jumbo_alloc(uma_zone_t, int, u_int8_t *, int);
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/* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */
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CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE);
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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_MEM_NAME, MSIZE,
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mb_ctor_mbuf, mb_dtor_mbuf,
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#ifdef INVARIANTS
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trash_init, trash_fini,
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#else
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NULL, NULL,
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#endif
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MSIZE - 1, UMA_ZONE_MAXBUCKET);
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zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES,
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mb_ctor_clust, mb_dtor_clust,
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#ifdef INVARIANTS
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trash_init, trash_fini,
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#else
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NULL, NULL,
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#endif
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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(MBUF_PACKET_MEM_NAME, mb_ctor_pack,
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mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf);
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/* Make jumbo frame zone too. Page size, 9k and 16k. */
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zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE,
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mb_ctor_clust, mb_dtor_clust,
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#ifdef INVARIANTS
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trash_init, trash_fini,
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#else
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NULL, NULL,
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#endif
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UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
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if (nmbjumbop > 0)
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uma_zone_set_max(zone_jumbop, nmbjumbop);
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zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES,
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mb_ctor_clust, mb_dtor_clust,
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#ifdef INVARIANTS
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trash_init, trash_fini,
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#else
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NULL, NULL,
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#endif
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UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
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if (nmbjumbo9 > 0)
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uma_zone_set_max(zone_jumbo9, nmbjumbo9);
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uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc);
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zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES,
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mb_ctor_clust, mb_dtor_clust,
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#ifdef INVARIANTS
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trash_init, trash_fini,
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#else
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NULL, NULL,
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#endif
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UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
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if (nmbjumbo16 > 0)
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uma_zone_set_max(zone_jumbo16, nmbjumbo16);
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uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc);
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zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int),
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NULL, NULL,
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NULL, NULL,
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UMA_ALIGN_PTR, UMA_ZONE_ZINIT);
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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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* UMA backend page allocator for the jumbo frame zones.
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*
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* Allocates kernel virtual memory that is backed by contiguous physical
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* pages.
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*/
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static void *
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mbuf_jumbo_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
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{
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/* Inform UMA that this allocator uses kernel_map/object. */
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*flags = UMA_SLAB_KERNEL;
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return ((void *)kmem_alloc_contig(kernel_map, bytes, wait,
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(vm_paddr_t)0, ~(vm_paddr_t)0, 1, 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. See mbuf.h.
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*/
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static int
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mb_ctor_mbuf(void *mem, int size, void *arg, int how)
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{
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struct mbuf *m;
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struct mb_args *args;
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#ifdef MAC
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int error;
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#endif
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int flags;
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short type;
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#ifdef INVARIANTS
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trash_ctor(mem, size, arg, how);
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#endif
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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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/*
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* The mbuf is initialized later. The caller has the
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* responsibility to set up any MAC labels too.
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*/
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if (type == MT_NOINIT)
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return (0);
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m->m_next = NULL;
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m->m_nextpkt = NULL;
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m->m_len = 0;
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m->m_flags = flags;
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m->m_type = type;
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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.header = NULL;
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m->m_pkthdr.len = 0;
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m->m_pkthdr.csum_flags = 0;
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m->m_pkthdr.csum_data = 0;
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m->m_pkthdr.tso_segsz = 0;
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m->m_pkthdr.ether_vtag = 0;
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m->m_pkthdr.flowid = 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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error = mac_mbuf_init(m, how);
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if (error)
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return (error);
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#endif
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} else
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m->m_data = m->m_dat;
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return (0);
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}
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/*
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* The Mbuf master 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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unsigned long flags;
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m = (struct mbuf *)mem;
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flags = (unsigned long)arg;
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if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0)
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m_tag_delete_chain(m, NULL);
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KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__));
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KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__));
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#ifdef INVARIANTS
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trash_dtor(mem, size, arg);
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#endif
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}
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/*
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* The Mbuf Packet zone destructor.
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*/
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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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/* Make sure we've got a clean cluster back. */
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KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__));
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KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__));
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KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__));
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KASSERT(m->m_ext.ext_arg1 == NULL, ("%s: ext_arg1 != NULL", __func__));
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KASSERT(m->m_ext.ext_arg2 == NULL, ("%s: ext_arg2 != NULL", __func__));
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KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__));
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KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__));
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KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__));
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#ifdef INVARIANTS
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trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg);
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#endif
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/*
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* If there are processes blocked on zone_clust, waiting for pages
|
|
* to be freed up, * cause them to be woken up by draining the
|
|
* packet zone. We are exposed to a race here * (in the check for
|
|
* the UMA_ZFLAG_FULL) where we might miss the flag set, but that
|
|
* is deliberate. We don't want to acquire the zone lock for every
|
|
* mbuf free.
|
|
*/
|
|
if (uma_zone_exhausted_nolock(zone_clust))
|
|
zone_drain(zone_pack);
|
|
}
|
|
|
|
/*
|
|
* The Cluster and Jumbo[PAGESIZE|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;
|
|
uma_zone_t zone;
|
|
|
|
#ifdef INVARIANTS
|
|
trash_ctor(mem, size, arg, how);
|
|
#endif
|
|
switch (size) {
|
|
case MCLBYTES:
|
|
type = EXT_CLUSTER;
|
|
zone = zone_clust;
|
|
break;
|
|
#if MJUMPAGESIZE != MCLBYTES
|
|
case MJUMPAGESIZE:
|
|
type = EXT_JUMBOP;
|
|
zone = zone_jumbop;
|
|
break;
|
|
#endif
|
|
case MJUM9BYTES:
|
|
type = EXT_JUMBO9;
|
|
zone = zone_jumbo9;
|
|
break;
|
|
case MJUM16BYTES:
|
|
type = EXT_JUMBO16;
|
|
zone = zone_jumbo16;
|
|
break;
|
|
default:
|
|
panic("unknown cluster size");
|
|
break;
|
|
}
|
|
|
|
m = (struct mbuf *)arg;
|
|
refcnt = uma_find_refcnt(zone, mem);
|
|
*refcnt = 1;
|
|
if (m != NULL) {
|
|
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_arg1 = NULL;
|
|
m->m_ext.ext_arg2 = NULL;
|
|
m->m_ext.ext_size = size;
|
|
m->m_ext.ext_type = type;
|
|
m->m_ext.ref_cnt = refcnt;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The Mbuf Cluster zone destructor.
|
|
*/
|
|
static void
|
|
mb_dtor_clust(void *mem, int size, void *arg)
|
|
{
|
|
#ifdef INVARIANTS
|
|
uma_zone_t zone;
|
|
|
|
zone = m_getzone(size);
|
|
KASSERT(*(uma_find_refcnt(zone, mem)) <= 1,
|
|
("%s: refcnt incorrect %u", __func__,
|
|
*(uma_find_refcnt(zone, mem))) );
|
|
|
|
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. */
|
|
if (uma_zalloc_arg(zone_clust, m, how) == NULL ||
|
|
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;
|
|
m->m_pkthdr.tso_segsz = 0;
|
|
m->m_pkthdr.ether_vtag = 0;
|
|
m->m_pkthdr.flowid = 0;
|
|
SLIST_INIT(&m->m_pkthdr.tags);
|
|
#ifdef MAC
|
|
/* If the label init fails, fail the alloc */
|
|
error = mac_mbuf_init(m, how);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
}
|
|
/* m_ext is already initialized. */
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
m_pkthdr_init(struct mbuf *m, int how)
|
|
{
|
|
#ifdef MAC
|
|
int error;
|
|
#endif
|
|
m->m_data = m->m_pktdat;
|
|
SLIST_INIT(&m->m_pkthdr.tags);
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_pkthdr.header = NULL;
|
|
m->m_pkthdr.len = 0;
|
|
m->m_pkthdr.flowid = 0;
|
|
m->m_pkthdr.csum_flags = 0;
|
|
m->m_pkthdr.csum_data = 0;
|
|
m->m_pkthdr.tso_segsz = 0;
|
|
m->m_pkthdr.ether_vtag = 0;
|
|
#ifdef MAC
|
|
/* If the label init fails, fail the alloc */
|
|
error = mac_mbuf_init(m, how);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
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)();
|
|
}
|