mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-29 12:03:03 +00:00
a04946cf6e
Ask uma_zcreate() to align mbufs to MSIZE bytes (otherwise dtom() breaks) As it happens, uma_zalloc_arg() always returned mbufs aligned to MSIZE anyway, but that was an implementation side-effect.... KASSERT -> CTASSERT suggested by: dd@ Approved by: silence on -net
384 lines
10 KiB
C
384 lines
10 KiB
C
/*-
|
|
* Copyright (c) 2004
|
|
* Bosko Milekic <bmilekic@FreeBSD.org>.
|
|
* 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.
|
|
* 3. Neither the name of the author nor the names of contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* 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 <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_mac.h"
|
|
#include "opt_param.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/mac.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/domain.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/smp.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/uma.h>
|
|
|
|
/*
|
|
* 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)_________________/
|
|
*/
|
|
|
|
int nmbclusters;
|
|
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);
|
|
SYSCTL_INT(_kern_ipc, OID_AUTO, nmbclusters, CTLFLAG_RW, &nmbclusters, 0,
|
|
"Maximum number of mbuf 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;
|
|
|
|
/*
|
|
* 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 *); /* XXX */
|
|
static void mb_dtor_pack(void *, int, void *); /* XXX */
|
|
static int mb_init_pack(void *, int, int);
|
|
static void mb_fini_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", MSIZE, mb_ctor_mbuf, mb_dtor_mbuf,
|
|
NULL, NULL, MSIZE - 1, UMA_ZONE_MAXBUCKET);
|
|
zone_clust = uma_zcreate("MbufClust", MCLBYTES, mb_ctor_clust,
|
|
mb_dtor_clust, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
|
|
if (nmbclusters > 0)
|
|
uma_zone_set_max(zone_clust, nmbclusters);
|
|
zone_pack = uma_zsecond_create("Packet", mb_ctor_pack, mb_dtor_pack,
|
|
mb_init_pack, mb_fini_pack, zone_mbuf);
|
|
|
|
/* 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.
|
|
*/
|
|
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;
|
|
|
|
m = (struct mbuf *)mem;
|
|
args = (struct mb_args *)arg;
|
|
flags = args->flags;
|
|
type = args->type;
|
|
|
|
m->m_type = type;
|
|
m->m_next = NULL;
|
|
m->m_nextpkt = NULL;
|
|
m->m_flags = flags;
|
|
if (flags & M_PKTHDR) {
|
|
m->m_data = m->m_pktdat;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_pkthdr.csum_flags = 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;
|
|
mbstat.m_mbufs += 1; /* XXX */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The Mbuf master zone and Packet secondary 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);
|
|
mbstat.m_mbufs -= 1; /* XXX */
|
|
}
|
|
|
|
/* XXX Only because of stats */
|
|
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);
|
|
mbstat.m_mbufs -= 1; /* XXX */
|
|
mbstat.m_mclusts -= 1; /* XXX */
|
|
}
|
|
|
|
/*
|
|
* The Cluster zone constructor.
|
|
*
|
|
* Here the 'arg' pointer points to the Mbuf which we
|
|
* are configuring cluster storage for.
|
|
*/
|
|
static int
|
|
mb_ctor_clust(void *mem, int size, void *arg, int how)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
m = (struct mbuf *)arg;
|
|
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 = MCLBYTES;
|
|
m->m_ext.ext_type = EXT_CLUSTER;
|
|
m->m_ext.ref_cnt = (u_int *)uma_find_refcnt(zone_clust,
|
|
m->m_ext.ext_buf);
|
|
*(m->m_ext.ref_cnt) = 1;
|
|
mbstat.m_mclusts += 1; /* XXX */
|
|
return (0);
|
|
}
|
|
|
|
/* XXX */
|
|
static void
|
|
mb_dtor_clust(void *mem, int size, void *arg)
|
|
{
|
|
mbstat.m_mclusts -= 1; /* XXX */
|
|
}
|
|
|
|
/*
|
|
* The Packet secondary zone's init routine, executed on the
|
|
* object's transition from keg slab to zone cache.
|
|
*/
|
|
static int
|
|
mb_init_pack(void *mem, int size, int how)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
m = (struct mbuf *)mem;
|
|
m->m_ext.ext_buf = NULL;
|
|
uma_zalloc_arg(zone_clust, m, how);
|
|
if (m->m_ext.ext_buf == NULL)
|
|
return (ENOMEM);
|
|
mbstat.m_mclusts -= 1; /* XXX */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* The Packet secondary zone's fini routine, executed on the
|
|
* object's transition from zone cache to keg slab.
|
|
*/
|
|
static void
|
|
mb_fini_pack(void *mem, int size)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
m = (struct mbuf *)mem;
|
|
uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL);
|
|
m->m_ext.ext_buf = NULL;
|
|
mbstat.m_mclusts += 1; /* XXX */
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
m->m_type = type;
|
|
m->m_next = NULL;
|
|
m->m_nextpkt = NULL;
|
|
m->m_data = m->m_ext.ext_buf;
|
|
m->m_flags = flags|M_EXT;
|
|
m->m_ext.ext_free = NULL;
|
|
m->m_ext.ext_args = NULL;
|
|
m->m_ext.ext_size = MCLBYTES;
|
|
m->m_ext.ext_type = EXT_PACKET;
|
|
*(m->m_ext.ref_cnt) = 1;
|
|
|
|
if (flags & M_PKTHDR) {
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_pkthdr.csum_flags = 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
|
|
}
|
|
mbstat.m_mbufs += 1; /* XXX */
|
|
mbstat.m_mclusts += 1; /* XXX */
|
|
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()");
|
|
|
|
mbstat.m_drain++;
|
|
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)();
|
|
}
|