1/*-
2 * Copyright (c) 2004, 2005,
3 * Bosko Milekic <bmilekic@FreeBSD.org>. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/kern/kern_mbuf.c 147537 2005-06-23 04:33:39Z silby $");
30
31#include "opt_mac.h"
32#include "opt_param.h"
33
34#include <sys/param.h>
35#include <sys/mac.h>
36#include <sys/malloc.h>
37#include <sys/systm.h>
38#include <sys/mbuf.h>
39#include <sys/domain.h>
40#include <sys/eventhandler.h>
41#include <sys/kernel.h>
42#include <sys/protosw.h>
43#include <sys/smp.h>
44#include <sys/sysctl.h>
45
46#include <vm/vm.h>
47#include <vm/vm_page.h>
48#include <vm/uma.h>
49#include <vm/uma_int.h>
50#include <vm/uma_dbg.h>
51
52/*
53 * In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA
54 * Zones.
55 *
56 * Mbuf Clusters (2K, contiguous) are allocated from the Cluster
57 * Zone. The Zone can be capped at kern.ipc.nmbclusters, if the
58 * administrator so desires.

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131static void
132mbuf_init(void *dummy)
133{
134
135 /*
136 * Configure UMA zones for Mbufs, Clusters, and Packets.
137 */
138 zone_mbuf = uma_zcreate("Mbuf", MSIZE, mb_ctor_mbuf, mb_dtor_mbuf,
139#ifdef INVARIANTS
140 trash_init, trash_fini, MSIZE - 1, UMA_ZONE_MAXBUCKET);
141#else
142 NULL, NULL, MSIZE - 1, UMA_ZONE_MAXBUCKET);
143#endif
144 zone_clust = uma_zcreate("MbufClust", MCLBYTES, mb_ctor_clust,
145#ifdef INVARIANTS
146 mb_dtor_clust, trash_init, trash_fini, UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
147#else
148 mb_dtor_clust, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
149#endif
150 if (nmbclusters > 0)
151 uma_zone_set_max(zone_clust, nmbclusters);
152 zone_pack = uma_zsecond_create("Packet", mb_ctor_pack, mb_dtor_pack,
153 mb_init_pack, mb_fini_pack, zone_mbuf);
154
155 /* uma_prealloc() goes here */
156
157 /*

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195 struct mbuf *m;
196 struct mb_args *args;
197#ifdef MAC
198 int error;
199#endif
200 int flags;
201 short type;
202
203#ifdef INVARIANTS
204 trash_ctor(mem, size, arg, how);
205#endif
206 m = (struct mbuf *)mem;
207 args = (struct mb_args *)arg;
208 flags = args->flags;
209 type = args->type;
210
211 m->m_type = type;
212 m->m_next = NULL;
213 m->m_nextpkt = NULL;

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235static void
236mb_dtor_mbuf(void *mem, int size, void *arg)
237{
238 struct mbuf *m;
239
240 m = (struct mbuf *)mem;
241 if ((m->m_flags & M_PKTHDR) != 0)
242 m_tag_delete_chain(m, NULL);
243#ifdef INVARIANTS
244 trash_dtor(mem, size, arg);
245#endif
246 mbstat.m_mbufs -= 1; /* XXX */
247}
248
249/* XXX Only because of stats */
250static void
251mb_dtor_pack(void *mem, int size, void *arg)
252{
253 struct mbuf *m;
254
255 m = (struct mbuf *)mem;
256 if ((m->m_flags & M_PKTHDR) != 0)
257 m_tag_delete_chain(m, NULL);
258#ifdef INVARIANTS
259 trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg);
260#endif
261 mbstat.m_mbufs -= 1; /* XXX */
262 mbstat.m_mclusts -= 1; /* XXX */
263}
264
265/*
266 * The Cluster zone constructor.
267 *
268 * Here the 'arg' pointer points to the Mbuf which we
269 * are configuring cluster storage for.
270 */
271static int
272mb_ctor_clust(void *mem, int size, void *arg, int how)
273{
274 struct mbuf *m;
275
276#ifdef INVARIANTS
277 trash_ctor(mem, size, arg, how);
278#endif
279 m = (struct mbuf *)arg;
280 m->m_ext.ext_buf = (caddr_t)mem;
281 m->m_data = m->m_ext.ext_buf;
282 m->m_flags |= M_EXT;
283 m->m_ext.ext_free = NULL;
284 m->m_ext.ext_args = NULL;
285 m->m_ext.ext_size = MCLBYTES;
286 m->m_ext.ext_type = EXT_CLUSTER;
287 m->m_ext.ref_cnt = NULL; /* Lazy counter assign. */
288 mbstat.m_mclusts += 1; /* XXX */
289 return (0);
290}
291
292/* XXX */
293static void
294mb_dtor_clust(void *mem, int size, void *arg)
295{
296#ifdef INVARIANTS
297 trash_dtor(mem, size, arg);
298#endif
299 mbstat.m_mclusts -= 1; /* XXX */
300}
301
302/*
303 * The Packet secondary zone's init routine, executed on the
304 * object's transition from keg slab to zone cache.
305 */
306static int
307mb_init_pack(void *mem, int size, int how)
308{
309 struct mbuf *m;
310
311 m = (struct mbuf *)mem;
312 m->m_ext.ext_buf = NULL;
313 uma_zalloc_arg(zone_clust, m, how);
314 if (m->m_ext.ext_buf == NULL)
315 return (ENOMEM);
316#ifdef INVARIANTS
317 trash_init(m->m_ext.ext_buf, MCLBYTES, how);
318#endif
319 mbstat.m_mclusts -= 1; /* XXX */
320 return (0);
321}
322
323/*
324 * The Packet secondary zone's fini routine, executed on the
325 * object's transition from zone cache to keg slab.
326 */
327static void
328mb_fini_pack(void *mem, int size)
329{
330 struct mbuf *m;
331
332 m = (struct mbuf *)mem;
333#ifdef INVARIANTS
334 trash_fini(m->m_ext.ext_buf, MCLBYTES);
335#endif
336 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL);
337 m->m_ext.ext_buf = NULL;
338 mbstat.m_mclusts += 1; /* XXX */
339}
340
341/*
342 * The "packet" keg constructor.
343 */

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352 int flags;
353 short type;
354
355 m = (struct mbuf *)mem;
356 args = (struct mb_args *)arg;
357 flags = args->flags;
358 type = args->type;
359
360#ifdef INVARIANTS
361 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how);
362#endif
363 m->m_type = type;
364 m->m_next = NULL;
365 m->m_nextpkt = NULL;
366 m->m_data = m->m_ext.ext_buf;
367 m->m_flags = flags|M_EXT;
368 m->m_ext.ext_free = NULL;
369 m->m_ext.ext_args = NULL;
370 m->m_ext.ext_size = MCLBYTES;

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