The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/vnet.h

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    1 /*-
    2  * Copyright (c) 2006-2009 University of Zagreb
    3  * Copyright (c) 2006-2009 FreeBSD Foundation
    4  * All rights reserved.
    5  *
    6  * This software was developed by the University of Zagreb and the
    7  * FreeBSD Foundation under sponsorship by the Stichting NLnet and the
    8  * FreeBSD Foundation.
    9  *
   10  * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
   11  * Copyright (c) 2009 Robert N. M. Watson
   12  * All rights reserved.
   13  *
   14  * Redistribution and use in source and binary forms, with or without
   15  * modification, are permitted provided that the following conditions
   16  * are met:
   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.
   22  *
   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
   33  * SUCH DAMAGE.
   34  *
   35  * $FreeBSD: releng/10.1/sys/net/vnet.h 262735 2014-03-04 14:05:37Z glebius $
   36  */
   37 
   38 /*-
   39  * This header file defines several sets of interfaces supporting virtualized
   40  * network stacks:
   41  *
   42  * - Definition of 'struct vnet' and functions and macros to allocate/free/
   43  *   manipulate it.
   44  *
   45  * - A virtual network stack memory allocator, which provides support for
   46  *   virtualized global variables via a special linker set, set_vnet.
   47  *
   48  * - Virtualized sysinits/sysuninits, which allow constructors and
   49  *   destructors to be run for each network stack subsystem as virtual
   50  *   instances are created and destroyed.
   51  *
   52  * If VIMAGE isn't compiled into the kernel, virtualized global variables
   53  * compile to normal global variables, and virtualized sysinits to regular
   54  * sysinits.
   55  */
   56 
   57 #ifndef _NET_VNET_H_
   58 #define _NET_VNET_H_
   59 
   60 /*
   61  * struct vnet describes a virtualized network stack, and is primarily a
   62  * pointer to storage for virtualized global variables.  Expose to userspace
   63  * as required for libkvm.
   64  */
   65 #if defined(_KERNEL) || defined(_WANT_VNET)
   66 #include <sys/queue.h>
   67 
   68 struct vnet {
   69         LIST_ENTRY(vnet)         vnet_le;       /* all vnets list */
   70         u_int                    vnet_magic_n;
   71         u_int                    vnet_ifcnt;
   72         u_int                    vnet_sockcnt;
   73         void                    *vnet_data_mem;
   74         uintptr_t                vnet_data_base;
   75 };
   76 #define VNET_MAGIC_N    0x3e0d8f29
   77 
   78 /*
   79  * These two virtual network stack allocator definitions are also required
   80  * for libkvm so that it can evaluate virtualized global variables.
   81  */
   82 #define VNET_SETNAME            "set_vnet"
   83 #define VNET_SYMPREFIX          "vnet_entry_"
   84 #endif
   85 
   86 #ifdef _KERNEL
   87 
   88 #define VNET_PCPUSTAT_DECLARE(type, name)       \
   89     VNET_DECLARE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
   90 
   91 #define VNET_PCPUSTAT_DEFINE(type, name)        \
   92     VNET_DEFINE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
   93 
   94 #define VNET_PCPUSTAT_ALLOC(name, wait) \
   95     COUNTER_ARRAY_ALLOC(VNET(name), \
   96         sizeof(VNET(name)) / sizeof(counter_u64_t), (wait))
   97 
   98 #define VNET_PCPUSTAT_FREE(name)        \
   99     COUNTER_ARRAY_FREE(VNET(name), sizeof(VNET(name)) / sizeof(counter_u64_t))
  100 
  101 #define VNET_PCPUSTAT_ADD(type, name, f, v)     \
  102     counter_u64_add(VNET(name)[offsetof(type, f) / sizeof(uint64_t)], (v))
  103 
  104 #define VNET_PCPUSTAT_SYSINIT(name)     \
  105 static void                             \
  106 vnet_##name##_init(const void *unused)  \
  107 {                                       \
  108         VNET_PCPUSTAT_ALLOC(name, M_WAITOK);    \
  109 }                                       \
  110 VNET_SYSINIT(vnet_ ## name ## _init, SI_SUB_PROTO_IFATTACHDOMAIN,       \
  111     SI_ORDER_ANY, vnet_ ## name ## _init, NULL)
  112 
  113 #define VNET_PCPUSTAT_SYSUNINIT(name)                                   \
  114 static void                                                             \
  115 vnet_##name##_uninit(const void *unused)                                \
  116 {                                                                       \
  117         VNET_PCPUSTAT_FREE(name);                                       \
  118 }                                                                       \
  119 VNET_SYSUNINIT(vnet_ ## name ## _uninit, SI_SUB_PROTO_IFATTACHDOMAIN,   \
  120     SI_ORDER_ANY, vnet_ ## name ## _uninit, NULL)
  121 
  122 #define SYSCTL_VNET_PCPUSTAT(parent, nbr, name, type, array, desc)      \
  123 static int                                                              \
  124 array##_sysctl(SYSCTL_HANDLER_ARGS)                                     \
  125 {                                                                       \
  126         type s;                                                         \
  127         CTASSERT((sizeof(type) / sizeof(uint64_t)) ==                   \
  128             (sizeof(VNET(array)) / sizeof(counter_u64_t)));             \
  129         COUNTER_ARRAY_COPY(VNET(array), &s, sizeof(type) / sizeof(uint64_t));\
  130         if (req->newptr)                                                \
  131                 COUNTER_ARRAY_ZERO(VNET(array),                         \
  132                     sizeof(type) / sizeof(uint64_t));                   \
  133         return (SYSCTL_OUT(req, &s, sizeof(type)));                     \
  134 }                                                                       \
  135 SYSCTL_VNET_PROC(parent, nbr, name, CTLTYPE_OPAQUE | CTLFLAG_RW, NULL,  \
  136     0, array ## _sysctl, "I", desc)
  137 
  138 #ifdef VIMAGE
  139 #include <sys/lock.h>
  140 #include <sys/proc.h>                   /* for struct thread */
  141 #include <sys/rwlock.h>
  142 #include <sys/sx.h>
  143 
  144 /*
  145  * Location of the kernel's 'set_vnet' linker set.
  146  */
  147 extern uintptr_t        *__start_set_vnet;
  148 __GLOBL(__start_set_vnet);
  149 extern uintptr_t        *__stop_set_vnet;
  150 __GLOBL(__stop_set_vnet);
  151 
  152 #define VNET_START      (uintptr_t)&__start_set_vnet
  153 #define VNET_STOP       (uintptr_t)&__stop_set_vnet
  154 
  155 /*
  156  * Functions to allocate and destroy virtual network stacks.
  157  */
  158 struct vnet *vnet_alloc(void);
  159 void    vnet_destroy(struct vnet *vnet);
  160 
  161 /*
  162  * The current virtual network stack -- we may wish to move this to struct
  163  * pcpu in the future.
  164  */
  165 #define curvnet curthread->td_vnet
  166 
  167 /*
  168  * Various macros -- get and set the current network stack, but also
  169  * assertions.
  170  */
  171 #if defined(INVARIANTS) || defined(VNET_DEBUG)
  172 #define VNET_ASSERT(exp, msg)   do {                                    \
  173         if (!(exp))                                                     \
  174                 panic msg;                                              \
  175 } while (0)
  176 #else
  177 #define VNET_ASSERT(exp, msg)   do {                                    \
  178 } while (0)
  179 #endif
  180 
  181 #ifdef VNET_DEBUG
  182 void vnet_log_recursion(struct vnet *, const char *, int);
  183 
  184 #define CURVNET_SET_QUIET(arg)                                          \
  185         VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
  186             ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p",            \
  187             __FILE__, __LINE__, __func__, curvnet, (arg)));             \
  188         struct vnet *saved_vnet = curvnet;                              \
  189         const char *saved_vnet_lpush = curthread->td_vnet_lpush;        \
  190         curvnet = arg;                                                  \
  191         curthread->td_vnet_lpush = __func__;
  192  
  193 #define CURVNET_SET_VERBOSE(arg)                                        \
  194         CURVNET_SET_QUIET(arg)                                          \
  195         if (saved_vnet)                                                 \
  196                 vnet_log_recursion(saved_vnet, saved_vnet_lpush, __LINE__);
  197 
  198 #define CURVNET_SET(arg)        CURVNET_SET_VERBOSE(arg)
  199  
  200 #define CURVNET_RESTORE()                                               \
  201         VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL ||           \
  202             saved_vnet->vnet_magic_n == VNET_MAGIC_N),                  \
  203             ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p",  \
  204             __FILE__, __LINE__, __func__, curvnet, saved_vnet));        \
  205         curvnet = saved_vnet;                                           \
  206         curthread->td_vnet_lpush = saved_vnet_lpush;
  207 #else /* !VNET_DEBUG */
  208 
  209 #define CURVNET_SET_QUIET(arg)                                          \
  210         VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
  211             ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p",            \
  212             __FILE__, __LINE__, __func__, curvnet, (arg)));             \
  213         struct vnet *saved_vnet = curvnet;                              \
  214         curvnet = arg;  
  215  
  216 #define CURVNET_SET_VERBOSE(arg)                                        \
  217         CURVNET_SET_QUIET(arg)
  218 
  219 #define CURVNET_SET(arg)        CURVNET_SET_VERBOSE(arg)
  220  
  221 #define CURVNET_RESTORE()                                               \
  222         VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL ||           \
  223             saved_vnet->vnet_magic_n == VNET_MAGIC_N),                  \
  224             ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p",  \
  225             __FILE__, __LINE__, __func__, curvnet, saved_vnet));        \
  226         curvnet = saved_vnet;
  227 #endif /* VNET_DEBUG */
  228 
  229 extern struct vnet *vnet0;
  230 #define IS_DEFAULT_VNET(arg)    ((arg) == vnet0)
  231 
  232 #define CRED_TO_VNET(cr)        (cr)->cr_prison->pr_vnet
  233 #define TD_TO_VNET(td)          CRED_TO_VNET((td)->td_ucred)
  234 #define P_TO_VNET(p)            CRED_TO_VNET((p)->p_ucred)
  235 
  236 /*
  237  * Global linked list of all virtual network stacks, along with read locks to
  238  * access it.  If a caller may sleep while accessing the list, it must use
  239  * the sleepable lock macros.
  240  */
  241 LIST_HEAD(vnet_list_head, vnet);
  242 extern struct vnet_list_head vnet_head;
  243 extern struct rwlock vnet_rwlock;
  244 extern struct sx vnet_sxlock;
  245 
  246 #define VNET_LIST_RLOCK()               sx_slock(&vnet_sxlock)
  247 #define VNET_LIST_RLOCK_NOSLEEP()       rw_rlock(&vnet_rwlock)
  248 #define VNET_LIST_RUNLOCK()             sx_sunlock(&vnet_sxlock)
  249 #define VNET_LIST_RUNLOCK_NOSLEEP()     rw_runlock(&vnet_rwlock)
  250 
  251 /*
  252  * Iteration macros to walk the global list of virtual network stacks.
  253  */
  254 #define VNET_ITERATOR_DECL(arg) struct vnet *arg
  255 #define VNET_FOREACH(arg)       LIST_FOREACH((arg), &vnet_head, vnet_le)
  256 
  257 /*
  258  * Virtual network stack memory allocator, which allows global variables to
  259  * be automatically instantiated for each network stack instance.
  260  */
  261 #define VNET_NAME(n)            vnet_entry_##n
  262 #define VNET_DECLARE(t, n)      extern t VNET_NAME(n)
  263 #define VNET_DEFINE(t, n)       t VNET_NAME(n) __section(VNET_SETNAME) __used
  264 #define _VNET_PTR(b, n)         (__typeof(VNET_NAME(n))*)               \
  265                                     ((b) + (uintptr_t)&VNET_NAME(n))
  266 
  267 #define _VNET(b, n)             (*_VNET_PTR(b, n))
  268 
  269 /*
  270  * Virtualized global variable accessor macros.
  271  */
  272 #define VNET_VNET_PTR(vnet, n)          _VNET_PTR((vnet)->vnet_data_base, n)
  273 #define VNET_VNET(vnet, n)              (*VNET_VNET_PTR((vnet), n))
  274 
  275 #define VNET_PTR(n)             VNET_VNET_PTR(curvnet, n)
  276 #define VNET(n)                 VNET_VNET(curvnet, n)
  277 
  278 /*
  279  * Virtual network stack allocator interfaces from the kernel linker.
  280  */
  281 void    *vnet_data_alloc(int size);
  282 void     vnet_data_copy(void *start, int size);
  283 void     vnet_data_free(void *start_arg, int size);
  284 
  285 /*
  286  * Sysctl variants for vnet-virtualized global variables.  Include
  287  * <sys/sysctl.h> to expose these definitions.
  288  *
  289  * Note: SYSCTL_PROC() handler functions will need to resolve pointer
  290  * arguments themselves, if required.
  291  */
  292 #ifdef SYSCTL_OID
  293 #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr)     \
  294         SYSCTL_OID(parent, nbr, name,                                   \
  295             CTLTYPE_INT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access),           \
  296             ptr, val, sysctl_handle_int, "I", descr)
  297 #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler,  \
  298             fmt, descr)                                                 \
  299         CTASSERT(((access) & CTLTYPE) != 0);                            \
  300         SYSCTL_OID(parent, nbr, name, CTLFLAG_VNET|(access), ptr, arg,  \
  301             handler, fmt, descr)
  302 #define SYSCTL_VNET_OPAQUE(parent, nbr, name, access, ptr, len, fmt,    \
  303             descr)                                                      \
  304         SYSCTL_OID(parent, nbr, name,                                   \
  305             CTLTYPE_OPAQUE|CTLFLAG_VNET|(access), ptr, len,             \
  306             sysctl_handle_opaque, fmt, descr)
  307 #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr)  \
  308         SYSCTL_OID(parent, nbr, name,                                   \
  309             CTLTYPE_STRING|CTLFLAG_VNET|(access),                       \
  310             arg, len, sysctl_handle_string, "A", descr)
  311 #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
  312         SYSCTL_OID(parent, nbr, name,                                   \
  313             CTLTYPE_OPAQUE|CTLFLAG_VNET|(access), ptr,                  \
  314             sizeof(struct type), sysctl_handle_opaque, "S," #type,      \
  315             descr)
  316 #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr)    \
  317         SYSCTL_OID(parent, nbr, name,                                   \
  318             CTLTYPE_UINT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access),          \
  319             ptr, val, sysctl_handle_int, "IU", descr)
  320 #define VNET_SYSCTL_ARG(req, arg1) do {                                 \
  321         if (arg1 != NULL)                                               \
  322                 arg1 = (void *)(TD_TO_VNET((req)->td)->vnet_data_base + \
  323                     (uintptr_t)(arg1));                                 \
  324 } while (0)
  325 #endif /* SYSCTL_OID */
  326 
  327 /*
  328  * Virtual sysinit mechanism, allowing network stack components to declare
  329  * startup and shutdown methods to be run when virtual network stack
  330  * instances are created and destroyed.
  331  */
  332 #include <sys/kernel.h>
  333 
  334 /*
  335  * SYSINIT/SYSUNINIT variants that provide per-vnet constructors and
  336  * destructors.
  337  */
  338 struct vnet_sysinit {
  339         enum sysinit_sub_id     subsystem;
  340         enum sysinit_elem_order order;
  341         sysinit_cfunc_t         func;
  342         const void              *arg;
  343         TAILQ_ENTRY(vnet_sysinit) link;
  344 };
  345 
  346 #define VNET_SYSINIT(ident, subsystem, order, func, arg)                \
  347         static struct vnet_sysinit ident ## _vnet_init = {              \
  348                 subsystem,                                              \
  349                 order,                                                  \
  350                 (sysinit_cfunc_t)(sysinit_nfunc_t)func,                 \
  351                 (arg)                                                   \
  352         };                                                              \
  353         SYSINIT(vnet_init_ ## ident, subsystem, order,                  \
  354             vnet_register_sysinit, &ident ## _vnet_init);               \
  355         SYSUNINIT(vnet_init_ ## ident, subsystem, order,                \
  356             vnet_deregister_sysinit, &ident ## _vnet_init)
  357 
  358 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg)              \
  359         static struct vnet_sysinit ident ## _vnet_uninit = {            \
  360                 subsystem,                                              \
  361                 order,                                                  \
  362                 (sysinit_cfunc_t)(sysinit_nfunc_t)func,                 \
  363                 (arg)                                                   \
  364         };                                                              \
  365         SYSINIT(vnet_uninit_ ## ident, subsystem, order,                \
  366             vnet_register_sysuninit, &ident ## _vnet_uninit);           \
  367         SYSUNINIT(vnet_uninit_ ## ident, subsystem, order,              \
  368             vnet_deregister_sysuninit, &ident ## _vnet_uninit)
  369 
  370 /*
  371  * Run per-vnet sysinits or sysuninits during vnet creation/destruction.
  372  */
  373 void     vnet_sysinit(void);
  374 void     vnet_sysuninit(void);
  375 
  376 /*
  377  * Interfaces for managing per-vnet constructors and destructors.
  378  */
  379 void    vnet_register_sysinit(void *arg);
  380 void    vnet_register_sysuninit(void *arg);
  381 void    vnet_deregister_sysinit(void *arg);
  382 void    vnet_deregister_sysuninit(void *arg);
  383 
  384 /*
  385  * EVENTHANDLER(9) extensions.
  386  */
  387 #include <sys/eventhandler.h>
  388 
  389 void    vnet_global_eventhandler_iterator_func(void *, ...);
  390 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
  391 do {                                                                    \
  392         if (IS_DEFAULT_VNET(curvnet)) {                                 \
  393                 (tag) = vimage_eventhandler_register(NULL, #name, func, \
  394                     arg, priority,                                      \
  395                     vnet_global_eventhandler_iterator_func);            \
  396         }                                                               \
  397 } while(0)
  398 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority)    \
  399 do {                                                                    \
  400         if (IS_DEFAULT_VNET(curvnet)) {                                 \
  401                 vimage_eventhandler_register(NULL, #name, func,         \
  402                     arg, priority,                                      \
  403                     vnet_global_eventhandler_iterator_func);            \
  404         }                                                               \
  405 } while(0)
  406 
  407 #else /* !VIMAGE */
  408 
  409 /*
  410  * Various virtual network stack macros compile to no-ops without VIMAGE.
  411  */
  412 #define curvnet                 NULL
  413 
  414 #define VNET_ASSERT(exp, msg)
  415 #define CURVNET_SET(arg)
  416 #define CURVNET_SET_QUIET(arg)
  417 #define CURVNET_RESTORE()
  418 
  419 #define VNET_LIST_RLOCK()
  420 #define VNET_LIST_RLOCK_NOSLEEP()
  421 #define VNET_LIST_RUNLOCK()
  422 #define VNET_LIST_RUNLOCK_NOSLEEP()
  423 #define VNET_ITERATOR_DECL(arg)
  424 #define VNET_FOREACH(arg)
  425 
  426 #define IS_DEFAULT_VNET(arg)    1
  427 #define CRED_TO_VNET(cr)        NULL
  428 #define TD_TO_VNET(td)          NULL
  429 #define P_TO_VNET(p)            NULL
  430 
  431 /*
  432  * Versions of the VNET macros that compile to normal global variables and
  433  * standard sysctl definitions.
  434  */
  435 #define VNET_NAME(n)            n
  436 #define VNET_DECLARE(t, n)      extern t n
  437 #define VNET_DEFINE(t, n)       t n
  438 #define _VNET_PTR(b, n)         &VNET_NAME(n)
  439 
  440 /*
  441  * Virtualized global variable accessor macros.
  442  */
  443 #define VNET_VNET_PTR(vnet, n)          (&(n))
  444 #define VNET_VNET(vnet, n)              (n)
  445 
  446 #define VNET_PTR(n)             (&(n))
  447 #define VNET(n)                 (n)
  448 
  449 /*
  450  * When VIMAGE isn't compiled into the kernel, virtaulized SYSCTLs simply
  451  * become normal SYSCTLs.
  452  */
  453 #ifdef SYSCTL_OID
  454 #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr)     \
  455         SYSCTL_INT(parent, nbr, name, access, ptr, val, descr)
  456 #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler,  \
  457             fmt, descr)                                                 \
  458         SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt,  \
  459             descr)
  460 #define SYSCTL_VNET_OPAQUE(parent, nbr, name, access, ptr, len, fmt,    \
  461             descr)                                                      \
  462         SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr)
  463 #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr)  \
  464         SYSCTL_STRING(parent, nbr, name, access, arg, len, descr)
  465 #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
  466         SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr)
  467 #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr)    \
  468         SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr)
  469 #define VNET_SYSCTL_ARG(req, arg1)
  470 #endif /* SYSCTL_OID */
  471 
  472 /*
  473  * When VIMAGE isn't compiled into the kernel, VNET_SYSINIT/VNET_SYSUNINIT
  474  * map into normal sysinits, which have the same ordering properties.
  475  */
  476 #define VNET_SYSINIT(ident, subsystem, order, func, arg)                \
  477         SYSINIT(ident, subsystem, order, func, arg)
  478 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg)              \
  479         SYSUNINIT(ident, subsystem, order, func, arg)
  480 
  481 /*
  482  * Without VIMAGE revert to the default implementation.
  483  */
  484 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
  485         (tag) = eventhandler_register(NULL, #name, func, arg, priority)
  486 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority)    \
  487         eventhandler_register(NULL, #name, func, arg, priority)
  488 #endif /* VIMAGE */
  489 #endif /* _KERNEL */
  490 
  491 #endif /* !_NET_VNET_H_ */

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