2 * Copyright (c) 2004-2009 University of Zagreb
3 * Copyright (c) 2006-2009 FreeBSD Foundation
6 * This software was developed by the University of Zagreb and the
7 * FreeBSD Foundation under sponsorship by the Stichting NLnet and the
10 * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
11 * Copyright (c) 2009 Robert N. M. Watson
12 * All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
41 #include "opt_kdtrace.h"
43 #include <sys/param.h>
45 #include <sys/kernel.h>
48 #include <sys/systm.h>
49 #include <sys/sysctl.h>
50 #include <sys/eventhandler.h>
51 #include <sys/linker_set.h>
53 #include <sys/malloc.h>
55 #include <sys/socket.h>
57 #include <sys/sysctl.h>
59 #include <machine/stdarg.h>
63 #include <ddb/db_sym.h>
67 #include <net/if_var.h>
71 * This file implements core functions for virtual network stacks:
73 * - Virtual network stack management functions.
75 * - Virtual network stack memory allocator, which virtualizes global
76 * variables in the network stack
78 * - Virtualized SYSINIT's/SYSUNINIT's, which allow network stack subsystems
79 * to register startup/shutdown events to be run for each virtual network
83 MALLOC_DEFINE(M_VNET, "vnet", "network stack control block");
86 * The virtual network stack list has two read-write locks, one sleepable and
87 * the other not, so that the list can be stablized and walked in a variety
88 * of network stack contexts. Both must be acquired exclusively to modify
89 * the list, but a read lock of either lock is sufficient to walk the list.
91 struct rwlock vnet_rwlock;
92 struct sx vnet_sxlock;
94 #define VNET_LIST_WLOCK() do { \
95 sx_xlock(&vnet_sxlock); \
96 rw_wlock(&vnet_rwlock); \
99 #define VNET_LIST_WUNLOCK() do { \
100 rw_wunlock(&vnet_rwlock); \
101 sx_xunlock(&vnet_sxlock); \
104 struct vnet_list_head vnet_head;
108 * The virtual network stack allocator provides storage for virtualized
109 * global variables. These variables are defined/declared using the
110 * VNET_DEFINE()/VNET_DECLARE() macros, which place them in the 'set_vnet'
111 * linker set. The details of the implementation are somewhat subtle, but
112 * allow the majority of most network subsystems to maintain
113 * virtualization-agnostic.
115 * The virtual network stack allocator handles variables in the base kernel
116 * vs. modules in similar but different ways. In both cases, virtualized
117 * global variables are marked as such by being declared to be part of the
118 * vnet linker set. These "master" copies of global variables serve two
121 * (1) They contain static initialization or "default" values for global
122 * variables which will be propagated to each virtual network stack
123 * instance when created. As with normal global variables, they default
126 * (2) They act as unique global names by which the variable can be referred
127 * to, regardless of network stack instance. The single global symbol
128 * will be used to calculate the location of a per-virtual instance
129 * variable at run-time.
131 * Each virtual network stack instance has a complete copy of each
132 * virtualized global variable, stored in a malloc'd block of memory
133 * referred to by vnet->vnet_data_mem. Critical to the design is that each
134 * per-instance memory block is laid out identically to the master block so
135 * that the offset of each global variable is the same across all blocks. To
136 * optimize run-time access, a precalculated 'base' address,
137 * vnet->vnet_data_base, is stored in each vnet, and is the amount that can
138 * be added to the address of a 'master' instance of a variable to get to the
141 * Virtualized global variables are handled in a similar manner, but as each
142 * module has its own 'set_vnet' linker set, and we want to keep all
143 * virtualized globals togther, we reserve space in the kernel's linker set
144 * for potential module variables using a per-vnet character array,
145 * 'modspace'. The virtual network stack allocator maintains a free list to
146 * track what space in the array is free (all, initially) and as modules are
147 * linked, allocates portions of the space to specific globals. The kernel
148 * module linker queries the virtual network stack allocator and will
149 * bind references of the global to the location during linking. It also
150 * calls into the virtual network stack allocator, once the memory is
151 * initialized, in order to propagate the new static initializations to all
152 * existing virtual network stack instances so that the soon-to-be executing
153 * module will find every network stack instance with proper default values.
157 * Location of the kernel's 'set_vnet' linker set.
159 extern uintptr_t *__start_set_vnet;
160 extern uintptr_t *__stop_set_vnet;
162 #define VNET_START (uintptr_t)&__start_set_vnet
163 #define VNET_STOP (uintptr_t)&__stop_set_vnet
166 * Number of bytes of data in the 'set_vnet' linker set, and hence the total
167 * size of all kernel virtualized global variables, and the malloc(9) type
168 * that will be used to allocate it.
170 #define VNET_BYTES (VNET_STOP - VNET_START)
172 MALLOC_DEFINE(M_VNET_DATA, "vnet_data", "VNET data");
175 * VNET_MODMIN is the minimum number of bytes we will reserve for the sum of
176 * global variables across all loaded modules. As this actually sizes an
177 * array declared as a virtualized global variable in the kernel itself, and
178 * we want the virtualized global variable space to be page-sized, we may
179 * have more space than that in practice.
181 #define VNET_MODMIN 8192
182 #define VNET_SIZE roundup2(VNET_BYTES, PAGE_SIZE)
183 #define VNET_MODSIZE (VNET_SIZE - (VNET_BYTES - VNET_MODMIN))
186 * Space to store virtualized global variables from loadable kernel modules,
187 * and the free list to manage it.
189 static VNET_DEFINE(char, modspace[VNET_MODMIN]);
192 * Global lists of subsystem constructor and destructors for vnets. They are
193 * registered via VNET_SYSINIT() and VNET_SYSUNINIT(). Both lists are
194 * protected by the vnet_sysinit_sxlock global lock.
196 static TAILQ_HEAD(vnet_sysinit_head, vnet_sysinit) vnet_constructors =
197 TAILQ_HEAD_INITIALIZER(vnet_constructors);
198 static TAILQ_HEAD(vnet_sysuninit_head, vnet_sysinit) vnet_destructors =
199 TAILQ_HEAD_INITIALIZER(vnet_destructors);
201 struct sx vnet_sysinit_sxlock;
203 #define VNET_SYSINIT_WLOCK() sx_xlock(&vnet_sysinit_sxlock);
204 #define VNET_SYSINIT_WUNLOCK() sx_xunlock(&vnet_sysinit_sxlock);
205 #define VNET_SYSINIT_RLOCK() sx_slock(&vnet_sysinit_sxlock);
206 #define VNET_SYSINIT_RUNLOCK() sx_sunlock(&vnet_sysinit_sxlock);
208 struct vnet_data_free {
211 TAILQ_ENTRY(vnet_data_free) vnd_link;
214 MALLOC_DEFINE(M_VNET_DATA_FREE, "vnet_data_free", "VNET resource accounting");
215 static TAILQ_HEAD(, vnet_data_free) vnet_data_free_head =
216 TAILQ_HEAD_INITIALIZER(vnet_data_free_head);
217 static struct sx vnet_data_free_lock;
219 SDT_PROVIDER_DEFINE(vnet);
220 SDT_PROBE_DEFINE1(vnet, functions, vnet_alloc, entry, "int");
221 SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, alloc, "int", "struct vnet *");
222 SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, return, "int", "struct vnet *");
223 SDT_PROBE_DEFINE2(vnet, functions, vnet_destroy, entry, "int", "struct vnet *");
224 SDT_PROBE_DEFINE1(vnet, functions, vnet_destroy, return, "int");
227 static void db_show_vnet_print_vs(struct vnet_sysinit *, int);
231 * Allocate a virtual network stack.
238 SDT_PROBE1(vnet, functions, vnet_alloc, entry, __LINE__);
239 vnet = malloc(sizeof(struct vnet), M_VNET, M_WAITOK | M_ZERO);
240 vnet->vnet_magic_n = VNET_MAGIC_N;
241 SDT_PROBE2(vnet, functions, vnet_alloc, alloc, __LINE__, vnet);
244 * Allocate storage for virtualized global variables and copy in
245 * initial values form our 'master' copy.
247 vnet->vnet_data_mem = malloc(VNET_SIZE, M_VNET_DATA, M_WAITOK);
248 memcpy(vnet->vnet_data_mem, (void *)VNET_START, VNET_BYTES);
251 * All use of vnet-specific data will immediately subtract VNET_START
252 * from the base memory pointer, so pre-calculate that now to avoid
255 vnet->vnet_data_base = (uintptr_t)vnet->vnet_data_mem - VNET_START;
257 /* Initialize / attach vnet module instances. */
258 CURVNET_SET_QUIET(vnet);
263 LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le);
266 SDT_PROBE2(vnet, functions, vnet_alloc, return, __LINE__, vnet);
271 * Destroy a virtual network stack.
274 vnet_destroy(struct vnet *vnet)
276 struct ifnet *ifp, *nifp;
278 SDT_PROBE2(vnet, functions, vnet_destroy, entry, __LINE__, vnet);
279 KASSERT(vnet->vnet_sockcnt == 0,
280 ("%s: vnet still has sockets", __func__));
283 LIST_REMOVE(vnet, vnet_le);
286 CURVNET_SET_QUIET(vnet);
288 /* Return all inherited interfaces to their parent vnets. */
289 TAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) {
290 if (ifp->if_home_vnet != ifp->if_vnet)
291 if_vmove(ifp, ifp->if_home_vnet);
298 * Release storage for the virtual network stack instance.
300 free(vnet->vnet_data_mem, M_VNET_DATA);
301 vnet->vnet_data_mem = NULL;
302 vnet->vnet_data_base = 0;
303 vnet->vnet_magic_n = 0xdeadbeef;
305 SDT_PROBE1(vnet, functions, vnet_destroy, return, __LINE__);
309 * Boot time initialization and allocation of virtual network stacks.
312 vnet_init_prelink(void *arg)
315 rw_init(&vnet_rwlock, "vnet_rwlock");
316 sx_init(&vnet_sxlock, "vnet_sxlock");
317 sx_init(&vnet_sysinit_sxlock, "vnet_sysinit_sxlock");
318 LIST_INIT(&vnet_head);
320 SYSINIT(vnet_init_prelink, SI_SUB_VNET_PRELINK, SI_ORDER_FIRST,
321 vnet_init_prelink, NULL);
324 vnet0_init(void *arg)
327 /* Warn people before take off - in case we crash early. */
328 printf("WARNING: VIMAGE (virtualized network stack) is a highly "
329 "experimental feature.\n");
332 * We MUST clear curvnet in vi_init_done() before going SMP,
333 * otherwise CURVNET_SET() macros would scream about unnecessary
334 * curvnet recursions.
336 curvnet = prison0.pr_vnet = vnet0 = vnet_alloc();
338 SYSINIT(vnet0_init, SI_SUB_VNET, SI_ORDER_FIRST, vnet0_init, NULL);
341 vnet_init_done(void *unused)
347 SYSINIT(vnet_init_done, SI_SUB_VNET_DONE, SI_ORDER_FIRST, vnet_init_done,
351 * Once on boot, initialize the modspace freelist to entirely cover modspace.
354 vnet_data_startup(void *dummy __unused)
356 struct vnet_data_free *df;
358 df = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO);
359 df->vnd_start = (uintptr_t)&VNET_NAME(modspace);
360 df->vnd_len = VNET_MODMIN;
361 TAILQ_INSERT_HEAD(&vnet_data_free_head, df, vnd_link);
362 sx_init(&vnet_data_free_lock, "vnet_data alloc lock");
364 SYSINIT(vnet_data, SI_SUB_KLD, SI_ORDER_FIRST, vnet_data_startup, 0);
367 * When a module is loaded and requires storage for a virtualized global
368 * variable, allocate space from the modspace free list. This interface
369 * should be used only by the kernel linker.
372 vnet_data_alloc(int size)
374 struct vnet_data_free *df;
378 size = roundup2(size, sizeof(void *));
379 sx_xlock(&vnet_data_free_lock);
380 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) {
381 if (df->vnd_len < size)
383 if (df->vnd_len == size) {
384 s = (void *)df->vnd_start;
385 TAILQ_REMOVE(&vnet_data_free_head, df, vnd_link);
386 free(df, M_VNET_DATA_FREE);
389 s = (void *)df->vnd_start;
391 df->vnd_start = df->vnd_start + size;
394 sx_xunlock(&vnet_data_free_lock);
400 * Free space for a virtualized global variable on module unload.
403 vnet_data_free(void *start_arg, int size)
405 struct vnet_data_free *df;
406 struct vnet_data_free *dn;
410 size = roundup2(size, sizeof(void *));
411 start = (uintptr_t)start_arg;
414 * Free a region of space and merge it with as many neighbors as
415 * possible. Keeping the list sorted simplifies this operation.
417 sx_xlock(&vnet_data_free_lock);
418 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) {
419 if (df->vnd_start > end)
422 * If we expand at the end of an entry we may have to merge
423 * it with the one following it as well.
425 if (df->vnd_start + df->vnd_len == start) {
427 dn = TAILQ_NEXT(df, vnd_link);
428 if (df->vnd_start + df->vnd_len == dn->vnd_start) {
429 df->vnd_len += dn->vnd_len;
430 TAILQ_REMOVE(&vnet_data_free_head, dn,
432 free(dn, M_VNET_DATA_FREE);
434 sx_xunlock(&vnet_data_free_lock);
437 if (df->vnd_start == end) {
438 df->vnd_start = start;
440 sx_xunlock(&vnet_data_free_lock);
444 dn = malloc(sizeof(*df), M_VNET_DATA_FREE, M_WAITOK | M_ZERO);
445 dn->vnd_start = start;
448 TAILQ_INSERT_BEFORE(df, dn, vnd_link);
450 TAILQ_INSERT_TAIL(&vnet_data_free_head, dn, vnd_link);
451 sx_xunlock(&vnet_data_free_lock);
455 * When a new virtualized global variable has been allocated, propagate its
456 * initial value to each already-allocated virtual network stack instance.
459 vnet_data_copy(void *start, int size)
464 LIST_FOREACH(vnet, &vnet_head, vnet_le)
465 memcpy((void *)((uintptr_t)vnet->vnet_data_base +
466 (uintptr_t)start), start, size);
471 * Variants on sysctl_handle_foo that know how to handle virtualized global
472 * variables: if 'arg1' is a pointer, then we transform it to the local vnet
476 vnet_sysctl_handle_int(SYSCTL_HANDLER_ARGS)
480 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
481 return (sysctl_handle_int(oidp, arg1, arg2, req));
485 vnet_sysctl_handle_opaque(SYSCTL_HANDLER_ARGS)
489 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
490 return (sysctl_handle_opaque(oidp, arg1, arg2, req));
494 vnet_sysctl_handle_string(SYSCTL_HANDLER_ARGS)
498 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
499 return (sysctl_handle_string(oidp, arg1, arg2, req));
503 vnet_sysctl_handle_uint(SYSCTL_HANDLER_ARGS)
507 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1);
508 return (sysctl_handle_int(oidp, arg1, arg2, req));
512 * Support for special SYSINIT handlers registered via VNET_SYSINIT()
513 * and VNET_SYSUNINIT().
516 vnet_register_sysinit(void *arg)
518 struct vnet_sysinit *vs, *vs2;
522 KASSERT(vs->subsystem > SI_SUB_VNET, ("vnet sysinit too early"));
524 /* Add the constructor to the global list of vnet constructors. */
525 VNET_SYSINIT_WLOCK();
526 TAILQ_FOREACH(vs2, &vnet_constructors, link) {
527 if (vs2->subsystem > vs->subsystem)
529 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order)
533 TAILQ_INSERT_BEFORE(vs2, vs, link);
535 TAILQ_INSERT_TAIL(&vnet_constructors, vs, link);
538 * Invoke the constructor on all the existing vnets when it is
542 CURVNET_SET_QUIET(vnet);
546 VNET_SYSINIT_WUNLOCK();
550 vnet_deregister_sysinit(void *arg)
552 struct vnet_sysinit *vs;
556 /* Remove the constructor from the global list of vnet constructors. */
557 VNET_SYSINIT_WLOCK();
558 TAILQ_REMOVE(&vnet_constructors, vs, link);
559 VNET_SYSINIT_WUNLOCK();
563 vnet_register_sysuninit(void *arg)
565 struct vnet_sysinit *vs, *vs2;
569 /* Add the destructor to the global list of vnet destructors. */
570 VNET_SYSINIT_WLOCK();
571 TAILQ_FOREACH(vs2, &vnet_destructors, link) {
572 if (vs2->subsystem > vs->subsystem)
574 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order)
578 TAILQ_INSERT_BEFORE(vs2, vs, link);
580 TAILQ_INSERT_TAIL(&vnet_destructors, vs, link);
581 VNET_SYSINIT_WUNLOCK();
585 vnet_deregister_sysuninit(void *arg)
587 struct vnet_sysinit *vs;
593 * Invoke the destructor on all the existing vnets when it is
596 VNET_SYSINIT_WLOCK();
598 CURVNET_SET_QUIET(vnet);
603 /* Remove the destructor from the global list of vnet destructors. */
604 TAILQ_REMOVE(&vnet_destructors, vs, link);
605 VNET_SYSINIT_WUNLOCK();
609 * Invoke all registered vnet constructors on the current vnet. Used during
610 * vnet construction. The caller is responsible for ensuring the new vnet is
611 * the current vnet and that the vnet_sysinit_sxlock lock is locked.
616 struct vnet_sysinit *vs;
618 VNET_SYSINIT_RLOCK();
619 TAILQ_FOREACH(vs, &vnet_constructors, link) {
622 VNET_SYSINIT_RUNLOCK();
626 * Invoke all registered vnet destructors on the current vnet. Used during
627 * vnet destruction. The caller is responsible for ensuring the dying vnet
628 * the current vnet and that the vnet_sysinit_sxlock lock is locked.
633 struct vnet_sysinit *vs;
635 VNET_SYSINIT_RLOCK();
636 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head,
640 VNET_SYSINIT_RUNLOCK();
644 * EVENTHANDLER(9) extensions.
647 * Invoke the eventhandler function originally registered with the possibly
648 * registered argument for all virtual network stack instances.
650 * This iterator can only be used for eventhandlers that do not take any
651 * additional arguments, as we do ignore the variadic arguments from the
652 * EVENTHANDLER_INVOKE() call.
655 vnet_global_eventhandler_iterator_func(void *arg, ...)
657 VNET_ITERATOR_DECL(vnet_iter);
658 struct eventhandler_entry_vimage *v_ee;
661 * There is a bug here in that we should actually cast things to
662 * (struct eventhandler_entry_ ## name *) but that's not easily
663 * possible in here so just re-using the variadic version we
664 * defined for the generic vimage case.
668 VNET_FOREACH(vnet_iter) {
669 CURVNET_SET(vnet_iter);
670 ((vimage_iterator_func_t)v_ee->func)(v_ee->ee_arg);
677 struct vnet_recursion {
678 SLIST_ENTRY(vnet_recursion) vnr_le;
680 const char *where_fn;
682 struct vnet *old_vnet;
683 struct vnet *new_vnet;
686 static SLIST_HEAD(, vnet_recursion) vnet_recursions =
687 SLIST_HEAD_INITIALIZER(vnet_recursions);
690 vnet_print_recursion(struct vnet_recursion *vnr, int brief)
694 printf("CURVNET_SET() recursion in ");
695 printf("%s() line %d, prev in %s()", vnr->where_fn, vnr->where_line,
701 printf("%p -> %p\n", vnr->old_vnet, vnr->new_vnet);
705 vnet_log_recursion(struct vnet *old_vnet, const char *old_fn, int line)
707 struct vnet_recursion *vnr;
709 /* Skip already logged recursion events. */
710 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le)
711 if (vnr->prev_fn == old_fn &&
712 vnr->where_fn == curthread->td_vnet_lpush &&
713 vnr->where_line == line &&
714 (vnr->old_vnet == vnr->new_vnet) == (curvnet == old_vnet))
717 vnr = malloc(sizeof(*vnr), M_VNET, M_NOWAIT | M_ZERO);
719 panic("%s: malloc failed", __func__);
720 vnr->prev_fn = old_fn;
721 vnr->where_fn = curthread->td_vnet_lpush;
722 vnr->where_line = line;
723 vnr->old_vnet = old_vnet;
724 vnr->new_vnet = curvnet;
726 SLIST_INSERT_HEAD(&vnet_recursions, vnr, vnr_le);
728 vnet_print_recursion(vnr, 0);
733 #endif /* VNET_DEBUG */
739 DB_SHOW_COMMAND(vnets, db_show_vnets)
741 VNET_ITERATOR_DECL(vnet_iter);
743 VNET_FOREACH(vnet_iter) {
744 db_printf("vnet = %p\n", vnet_iter);
745 db_printf(" vnet_magic_n = 0x%x (%s, orig 0x%x)\n",
746 vnet_iter->vnet_magic_n,
747 (vnet_iter->vnet_magic_n == VNET_MAGIC_N) ?
748 "ok" : "mismatch", VNET_MAGIC_N);
749 db_printf(" vnet_ifcnt = %u\n", vnet_iter->vnet_ifcnt);
750 db_printf(" vnet_sockcnt = %u\n", vnet_iter->vnet_sockcnt);
751 db_printf(" vnet_data_mem = %p\n", vnet_iter->vnet_data_mem);
752 db_printf(" vnet_data_base = 0x%jx\n",
753 (uintmax_t)vnet_iter->vnet_data_base);
761 db_show_vnet_print_vs(struct vnet_sysinit *vs, int ddb)
763 const char *vsname, *funcname;
767 #define xprint(...) \
769 db_printf(__VA_ARGS__); \
774 xprint("%s: no vnet_sysinit * given\n", __func__);
778 sym = db_search_symbol((vm_offset_t)vs, DB_STGY_ANY, &offset);
779 db_symbol_values(sym, &vsname, NULL);
780 sym = db_search_symbol((vm_offset_t)vs->func, DB_STGY_PROC, &offset);
781 db_symbol_values(sym, &funcname, NULL);
782 xprint("%s(%p)\n", (vsname != NULL) ? vsname : "", vs);
783 xprint(" 0x%08x 0x%08x\n", vs->subsystem, vs->order);
784 xprint(" %p(%s)(%p)\n",
785 vs->func, (funcname != NULL) ? funcname : "", vs->arg);
789 DB_SHOW_COMMAND(vnet_sysinit, db_show_vnet_sysinit)
791 struct vnet_sysinit *vs;
793 db_printf("VNET_SYSINIT vs Name(Ptr)\n");
794 db_printf(" Subsystem Order\n");
795 db_printf(" Function(Name)(Arg)\n");
796 TAILQ_FOREACH(vs, &vnet_constructors, link) {
797 db_show_vnet_print_vs(vs, 1);
803 DB_SHOW_COMMAND(vnet_sysuninit, db_show_vnet_sysuninit)
805 struct vnet_sysinit *vs;
807 db_printf("VNET_SYSUNINIT vs Name(Ptr)\n");
808 db_printf(" Subsystem Order\n");
809 db_printf(" Function(Name)(Arg)\n");
810 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head,
812 db_show_vnet_print_vs(vs, 1);
819 DB_SHOW_COMMAND(vnetrcrs, db_show_vnetrcrs)
821 struct vnet_recursion *vnr;
823 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le)
824 vnet_print_recursion(vnr, 1);