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
9 * notice unmodified, this list of conditions and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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>
| 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
9 * notice unmodified, this list of conditions and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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>
|
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
50/*
51 * In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA
52 * Zones.
53 *
54 * Mbuf Clusters (2K, contiguous) are allocated from the Cluster
55 * Zone. The Zone can be capped at kern.ipc.nmbclusters, if the
56 * administrator so desires.
57 *
58 * Mbufs are allocated from a UMA Master Zone called the Mbuf
59 * Zone.
60 *
61 * Additionally, FreeBSD provides a Packet Zone, which it
62 * configures as a Secondary Zone to the Mbuf Master Zone,
63 * thus sharing backend Slab kegs with the Mbuf Master Zone.
64 *
65 * Thus common-case allocations and locking are simplified:
66 *
67 * m_clget() m_getcl()
68 * | |
69 * | .------------>[(Packet Cache)] m_get(), m_gethdr()
70 * | | [ Packet ] |
71 * [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ]
72 * [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ]
73 * | \________ |
74 * [ Cluster Keg ] \ /
75 * | [ Mbuf Keg ]
76 * [ Cluster Slabs ] |
77 * | [ Mbuf Slabs ]
78 * \____________(VM)_________________/
79 */
80
81int nmbclusters;
82struct mbstat mbstat;
83
84static void
85tunable_mbinit(void *dummy)
86{
87
88 /* This has to be done before VM init. */
89 nmbclusters = 1024 + maxusers * 64;
90 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters);
91}
92SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_ANY, tunable_mbinit, NULL);
93
94SYSCTL_DECL(_kern_ipc);
95SYSCTL_INT(_kern_ipc, OID_AUTO, nmbclusters, CTLFLAG_RW, &nmbclusters, 0,
96 "Maximum number of mbuf clusters allowed");
97SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat,
98 "Mbuf general information and statistics");
99
100/*
101 * Zones from which we allocate.
102 */
103uma_zone_t zone_mbuf;
104uma_zone_t zone_clust;
105uma_zone_t zone_pack;
106
107/*
108 * Local prototypes.
109 */
110static int mb_ctor_mbuf(void *, int, void *, int);
111static int mb_ctor_clust(void *, int, void *, int);
112static int mb_ctor_pack(void *, int, void *, int);
113static void mb_dtor_mbuf(void *, int, void *);
114static void mb_dtor_clust(void *, int, void *); /* XXX */
115static void mb_dtor_pack(void *, int, void *); /* XXX */
116static int mb_init_pack(void *, int, int);
117static void mb_fini_pack(void *, int);
118
119static void mb_reclaim(void *);
120static void mbuf_init(void *);
121
122/* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */
123CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE);
124
125/*
126 * Initialize FreeBSD Network buffer allocation.
127 */
128SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL)
129static void
130mbuf_init(void *dummy)
131{
132
133 /*
134 * Configure UMA zones for Mbufs, Clusters, and Packets.
135 */
136 zone_mbuf = uma_zcreate("Mbuf", MSIZE, mb_ctor_mbuf, mb_dtor_mbuf,
137 NULL, NULL, MSIZE - 1, UMA_ZONE_MAXBUCKET);
138 zone_clust = uma_zcreate("MbufClust", MCLBYTES, mb_ctor_clust,
139 mb_dtor_clust, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
140 if (nmbclusters > 0)
141 uma_zone_set_max(zone_clust, nmbclusters);
142 zone_pack = uma_zsecond_create("Packet", mb_ctor_pack, mb_dtor_pack,
143 mb_init_pack, mb_fini_pack, zone_mbuf);
144
145 /* uma_prealloc() goes here */
146
147 /*
148 * Hook event handler for low-memory situation, used to
149 * drain protocols and push data back to the caches (UMA
150 * later pushes it back to VM).
151 */
152 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL,
153 EVENTHANDLER_PRI_FIRST);
154
155 /*
156 * [Re]set counters and local statistics knobs.
157 * XXX Some of these should go and be replaced, but UMA stat
158 * gathering needs to be revised.
159 */
160 mbstat.m_mbufs = 0;
161 mbstat.m_mclusts = 0;
162 mbstat.m_drain = 0;
163 mbstat.m_msize = MSIZE;
164 mbstat.m_mclbytes = MCLBYTES;
165 mbstat.m_minclsize = MINCLSIZE;
166 mbstat.m_mlen = MLEN;
167 mbstat.m_mhlen = MHLEN;
168 mbstat.m_numtypes = MT_NTYPES;
169
170 mbstat.m_mcfail = mbstat.m_mpfail = 0;
171 mbstat.sf_iocnt = 0;
172 mbstat.sf_allocwait = mbstat.sf_allocfail = 0;
173}
174
175/*
176 * Constructor for Mbuf master zone.
177 *
178 * The 'arg' pointer points to a mb_args structure which
179 * contains call-specific information required to support the
180 * mbuf allocation API.
181 */
182static int
183mb_ctor_mbuf(void *mem, int size, void *arg, int how)
184{
185 struct mbuf *m;
186 struct mb_args *args;
187#ifdef MAC
188 int error;
189#endif
190 int flags;
191 short type;
192
193 m = (struct mbuf *)mem;
194 args = (struct mb_args *)arg;
195 flags = args->flags;
196 type = args->type;
197
198 m->m_type = type;
199 m->m_next = NULL;
200 m->m_nextpkt = NULL;
201 m->m_flags = flags;
202 if (flags & M_PKTHDR) {
203 m->m_data = m->m_pktdat;
204 m->m_pkthdr.rcvif = NULL;
205 m->m_pkthdr.csum_flags = 0;
206 SLIST_INIT(&m->m_pkthdr.tags);
207#ifdef MAC
208 /* If the label init fails, fail the alloc */
209 error = mac_init_mbuf(m, how);
210 if (error)
211 return (error);
212#endif
213 } else
214 m->m_data = m->m_dat;
215 mbstat.m_mbufs += 1; /* XXX */
216 return (0);
217}
218
219/*
220 * The Mbuf master zone and Packet secondary zone destructor.
221 */
222static void
223mb_dtor_mbuf(void *mem, int size, void *arg)
224{
225 struct mbuf *m;
226
227 m = (struct mbuf *)mem;
228 if ((m->m_flags & M_PKTHDR) != 0)
229 m_tag_delete_chain(m, NULL);
230 mbstat.m_mbufs -= 1; /* XXX */
231}
232
233/* XXX Only because of stats */
234static void
235mb_dtor_pack(void *mem, int size, void *arg)
236{
237 struct mbuf *m;
238
239 m = (struct mbuf *)mem;
240 if ((m->m_flags & M_PKTHDR) != 0)
241 m_tag_delete_chain(m, NULL);
242 mbstat.m_mbufs -= 1; /* XXX */
243 mbstat.m_mclusts -= 1; /* XXX */
244}
245
246/*
247 * The Cluster zone constructor.
248 *
249 * Here the 'arg' pointer points to the Mbuf which we
250 * are configuring cluster storage for.
251 */
252static int
253mb_ctor_clust(void *mem, int size, void *arg, int how)
254{
255 struct mbuf *m;
256
257 m = (struct mbuf *)arg;
258 m->m_ext.ext_buf = (caddr_t)mem;
259 m->m_data = m->m_ext.ext_buf;
260 m->m_flags |= M_EXT;
261 m->m_ext.ext_free = NULL;
262 m->m_ext.ext_args = NULL;
263 m->m_ext.ext_size = MCLBYTES;
264 m->m_ext.ext_type = EXT_CLUSTER;
265 m->m_ext.ref_cnt = NULL; /* Lazy counter assign. */
266 mbstat.m_mclusts += 1; /* XXX */
267 return (0);
268}
269
270/* XXX */
271static void
272mb_dtor_clust(void *mem, int size, void *arg)
273{
274 mbstat.m_mclusts -= 1; /* XXX */
275}
276
277/*
278 * The Packet secondary zone's init routine, executed on the
279 * object's transition from keg slab to zone cache.
280 */
281static int
282mb_init_pack(void *mem, int size, int how)
283{
284 struct mbuf *m;
285
286 m = (struct mbuf *)mem;
287 m->m_ext.ext_buf = NULL;
288 uma_zalloc_arg(zone_clust, m, how);
289 if (m->m_ext.ext_buf == NULL)
290 return (ENOMEM);
291 mbstat.m_mclusts -= 1; /* XXX */
292 return (0);
293}
294
295/*
296 * The Packet secondary zone's fini routine, executed on the
297 * object's transition from zone cache to keg slab.
298 */
299static void
300mb_fini_pack(void *mem, int size)
301{
302 struct mbuf *m;
303
304 m = (struct mbuf *)mem;
305 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL);
306 m->m_ext.ext_buf = NULL;
307 mbstat.m_mclusts += 1; /* XXX */
308}
309
310/*
311 * The "packet" keg constructor.
312 */
313static int
314mb_ctor_pack(void *mem, int size, void *arg, int how)
315{
316 struct mbuf *m;
317 struct mb_args *args;
318#ifdef MAC
319 int error;
320#endif
321 int flags;
322 short type;
323
324 m = (struct mbuf *)mem;
325 args = (struct mb_args *)arg;
326 flags = args->flags;
327 type = args->type;
328
329 m->m_type = type;
330 m->m_next = NULL;
331 m->m_nextpkt = NULL;
332 m->m_data = m->m_ext.ext_buf;
333 m->m_flags = flags|M_EXT;
334 m->m_ext.ext_free = NULL;
335 m->m_ext.ext_args = NULL;
336 m->m_ext.ext_size = MCLBYTES;
337 m->m_ext.ext_type = EXT_PACKET;
338 m->m_ext.ref_cnt = NULL; /* Lazy counter assign. */
339
340 if (flags & M_PKTHDR) {
341 m->m_pkthdr.rcvif = NULL;
342 m->m_pkthdr.csum_flags = 0;
343 SLIST_INIT(&m->m_pkthdr.tags);
344#ifdef MAC
345 /* If the label init fails, fail the alloc */
346 error = mac_init_mbuf(m, how);
347 if (error)
348 return (error);
349#endif
350 }
351 mbstat.m_mbufs += 1; /* XXX */
352 mbstat.m_mclusts += 1; /* XXX */
353 return (0);
354}
355
356/*
357 * This is the protocol drain routine.
358 *
359 * No locks should be held when this is called. The drain routines have to
360 * presently acquire some locks which raises the possibility of lock order
361 * reversal.
362 */
363static void
364mb_reclaim(void *junk)
365{
366 struct domain *dp;
367 struct protosw *pr;
368
369 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL,
370 "mb_reclaim()");
371
372 mbstat.m_drain++;
373 for (dp = domains; dp != NULL; dp = dp->dom_next)
374 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
375 if (pr->pr_drain != NULL)
376 (*pr->pr_drain)();
377}
| 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
50/*
51 * In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA
52 * Zones.
53 *
54 * Mbuf Clusters (2K, contiguous) are allocated from the Cluster
55 * Zone. The Zone can be capped at kern.ipc.nmbclusters, if the
56 * administrator so desires.
57 *
58 * Mbufs are allocated from a UMA Master Zone called the Mbuf
59 * Zone.
60 *
61 * Additionally, FreeBSD provides a Packet Zone, which it
62 * configures as a Secondary Zone to the Mbuf Master Zone,
63 * thus sharing backend Slab kegs with the Mbuf Master Zone.
64 *
65 * Thus common-case allocations and locking are simplified:
66 *
67 * m_clget() m_getcl()
68 * | |
69 * | .------------>[(Packet Cache)] m_get(), m_gethdr()
70 * | | [ Packet ] |
71 * [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ]
72 * [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ]
73 * | \________ |
74 * [ Cluster Keg ] \ /
75 * | [ Mbuf Keg ]
76 * [ Cluster Slabs ] |
77 * | [ Mbuf Slabs ]
78 * \____________(VM)_________________/
79 */
80
81int nmbclusters;
82struct mbstat mbstat;
83
84static void
85tunable_mbinit(void *dummy)
86{
87
88 /* This has to be done before VM init. */
89 nmbclusters = 1024 + maxusers * 64;
90 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters);
91}
92SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_ANY, tunable_mbinit, NULL);
93
94SYSCTL_DECL(_kern_ipc);
95SYSCTL_INT(_kern_ipc, OID_AUTO, nmbclusters, CTLFLAG_RW, &nmbclusters, 0,
96 "Maximum number of mbuf clusters allowed");
97SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat,
98 "Mbuf general information and statistics");
99
100/*
101 * Zones from which we allocate.
102 */
103uma_zone_t zone_mbuf;
104uma_zone_t zone_clust;
105uma_zone_t zone_pack;
106
107/*
108 * Local prototypes.
109 */
110static int mb_ctor_mbuf(void *, int, void *, int);
111static int mb_ctor_clust(void *, int, void *, int);
112static int mb_ctor_pack(void *, int, void *, int);
113static void mb_dtor_mbuf(void *, int, void *);
114static void mb_dtor_clust(void *, int, void *); /* XXX */
115static void mb_dtor_pack(void *, int, void *); /* XXX */
116static int mb_init_pack(void *, int, int);
117static void mb_fini_pack(void *, int);
118
119static void mb_reclaim(void *);
120static void mbuf_init(void *);
121
122/* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */
123CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE);
124
125/*
126 * Initialize FreeBSD Network buffer allocation.
127 */
128SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL)
129static void
130mbuf_init(void *dummy)
131{
132
133 /*
134 * Configure UMA zones for Mbufs, Clusters, and Packets.
135 */
136 zone_mbuf = uma_zcreate("Mbuf", MSIZE, mb_ctor_mbuf, mb_dtor_mbuf,
137 NULL, NULL, MSIZE - 1, UMA_ZONE_MAXBUCKET);
138 zone_clust = uma_zcreate("MbufClust", MCLBYTES, mb_ctor_clust,
139 mb_dtor_clust, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
140 if (nmbclusters > 0)
141 uma_zone_set_max(zone_clust, nmbclusters);
142 zone_pack = uma_zsecond_create("Packet", mb_ctor_pack, mb_dtor_pack,
143 mb_init_pack, mb_fini_pack, zone_mbuf);
144
145 /* uma_prealloc() goes here */
146
147 /*
148 * Hook event handler for low-memory situation, used to
149 * drain protocols and push data back to the caches (UMA
150 * later pushes it back to VM).
151 */
152 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL,
153 EVENTHANDLER_PRI_FIRST);
154
155 /*
156 * [Re]set counters and local statistics knobs.
157 * XXX Some of these should go and be replaced, but UMA stat
158 * gathering needs to be revised.
159 */
160 mbstat.m_mbufs = 0;
161 mbstat.m_mclusts = 0;
162 mbstat.m_drain = 0;
163 mbstat.m_msize = MSIZE;
164 mbstat.m_mclbytes = MCLBYTES;
165 mbstat.m_minclsize = MINCLSIZE;
166 mbstat.m_mlen = MLEN;
167 mbstat.m_mhlen = MHLEN;
168 mbstat.m_numtypes = MT_NTYPES;
169
170 mbstat.m_mcfail = mbstat.m_mpfail = 0;
171 mbstat.sf_iocnt = 0;
172 mbstat.sf_allocwait = mbstat.sf_allocfail = 0;
173}
174
175/*
176 * Constructor for Mbuf master zone.
177 *
178 * The 'arg' pointer points to a mb_args structure which
179 * contains call-specific information required to support the
180 * mbuf allocation API.
181 */
182static int
183mb_ctor_mbuf(void *mem, int size, void *arg, int how)
184{
185 struct mbuf *m;
186 struct mb_args *args;
187#ifdef MAC
188 int error;
189#endif
190 int flags;
191 short type;
192
193 m = (struct mbuf *)mem;
194 args = (struct mb_args *)arg;
195 flags = args->flags;
196 type = args->type;
197
198 m->m_type = type;
199 m->m_next = NULL;
200 m->m_nextpkt = NULL;
201 m->m_flags = flags;
202 if (flags & M_PKTHDR) {
203 m->m_data = m->m_pktdat;
204 m->m_pkthdr.rcvif = NULL;
205 m->m_pkthdr.csum_flags = 0;
206 SLIST_INIT(&m->m_pkthdr.tags);
207#ifdef MAC
208 /* If the label init fails, fail the alloc */
209 error = mac_init_mbuf(m, how);
210 if (error)
211 return (error);
212#endif
213 } else
214 m->m_data = m->m_dat;
215 mbstat.m_mbufs += 1; /* XXX */
216 return (0);
217}
218
219/*
220 * The Mbuf master zone and Packet secondary zone destructor.
221 */
222static void
223mb_dtor_mbuf(void *mem, int size, void *arg)
224{
225 struct mbuf *m;
226
227 m = (struct mbuf *)mem;
228 if ((m->m_flags & M_PKTHDR) != 0)
229 m_tag_delete_chain(m, NULL);
230 mbstat.m_mbufs -= 1; /* XXX */
231}
232
233/* XXX Only because of stats */
234static void
235mb_dtor_pack(void *mem, int size, void *arg)
236{
237 struct mbuf *m;
238
239 m = (struct mbuf *)mem;
240 if ((m->m_flags & M_PKTHDR) != 0)
241 m_tag_delete_chain(m, NULL);
242 mbstat.m_mbufs -= 1; /* XXX */
243 mbstat.m_mclusts -= 1; /* XXX */
244}
245
246/*
247 * The Cluster zone constructor.
248 *
249 * Here the 'arg' pointer points to the Mbuf which we
250 * are configuring cluster storage for.
251 */
252static int
253mb_ctor_clust(void *mem, int size, void *arg, int how)
254{
255 struct mbuf *m;
256
257 m = (struct mbuf *)arg;
258 m->m_ext.ext_buf = (caddr_t)mem;
259 m->m_data = m->m_ext.ext_buf;
260 m->m_flags |= M_EXT;
261 m->m_ext.ext_free = NULL;
262 m->m_ext.ext_args = NULL;
263 m->m_ext.ext_size = MCLBYTES;
264 m->m_ext.ext_type = EXT_CLUSTER;
265 m->m_ext.ref_cnt = NULL; /* Lazy counter assign. */
266 mbstat.m_mclusts += 1; /* XXX */
267 return (0);
268}
269
270/* XXX */
271static void
272mb_dtor_clust(void *mem, int size, void *arg)
273{
274 mbstat.m_mclusts -= 1; /* XXX */
275}
276
277/*
278 * The Packet secondary zone's init routine, executed on the
279 * object's transition from keg slab to zone cache.
280 */
281static int
282mb_init_pack(void *mem, int size, int how)
283{
284 struct mbuf *m;
285
286 m = (struct mbuf *)mem;
287 m->m_ext.ext_buf = NULL;
288 uma_zalloc_arg(zone_clust, m, how);
289 if (m->m_ext.ext_buf == NULL)
290 return (ENOMEM);
291 mbstat.m_mclusts -= 1; /* XXX */
292 return (0);
293}
294
295/*
296 * The Packet secondary zone's fini routine, executed on the
297 * object's transition from zone cache to keg slab.
298 */
299static void
300mb_fini_pack(void *mem, int size)
301{
302 struct mbuf *m;
303
304 m = (struct mbuf *)mem;
305 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL);
306 m->m_ext.ext_buf = NULL;
307 mbstat.m_mclusts += 1; /* XXX */
308}
309
310/*
311 * The "packet" keg constructor.
312 */
313static int
314mb_ctor_pack(void *mem, int size, void *arg, int how)
315{
316 struct mbuf *m;
317 struct mb_args *args;
318#ifdef MAC
319 int error;
320#endif
321 int flags;
322 short type;
323
324 m = (struct mbuf *)mem;
325 args = (struct mb_args *)arg;
326 flags = args->flags;
327 type = args->type;
328
329 m->m_type = type;
330 m->m_next = NULL;
331 m->m_nextpkt = NULL;
332 m->m_data = m->m_ext.ext_buf;
333 m->m_flags = flags|M_EXT;
334 m->m_ext.ext_free = NULL;
335 m->m_ext.ext_args = NULL;
336 m->m_ext.ext_size = MCLBYTES;
337 m->m_ext.ext_type = EXT_PACKET;
338 m->m_ext.ref_cnt = NULL; /* Lazy counter assign. */
339
340 if (flags & M_PKTHDR) {
341 m->m_pkthdr.rcvif = NULL;
342 m->m_pkthdr.csum_flags = 0;
343 SLIST_INIT(&m->m_pkthdr.tags);
344#ifdef MAC
345 /* If the label init fails, fail the alloc */
346 error = mac_init_mbuf(m, how);
347 if (error)
348 return (error);
349#endif
350 }
351 mbstat.m_mbufs += 1; /* XXX */
352 mbstat.m_mclusts += 1; /* XXX */
353 return (0);
354}
355
356/*
357 * This is the protocol drain routine.
358 *
359 * No locks should be held when this is called. The drain routines have to
360 * presently acquire some locks which raises the possibility of lock order
361 * reversal.
362 */
363static void
364mb_reclaim(void *junk)
365{
366 struct domain *dp;
367 struct protosw *pr;
368
369 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL,
370 "mb_reclaim()");
371
372 mbstat.m_drain++;
373 for (dp = domains; dp != NULL; dp = dp->dom_next)
374 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
375 if (pr->pr_drain != NULL)
376 (*pr->pr_drain)();
377}
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