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/*-
* Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
* Copyright (c) 2009 Robert N. M. Watson
* 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, 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.
*
* 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.
*
* $FreeBSD$
*/
/*
* This is the virtual network stack memory allocator, which provides support
* for virtualized global variables via a special linker set, set_vnet. When
* "options VIMAGE" isn't defined, virtualized global variables are compiled
* as normal globals.
*/
#ifndef _NET_VNET_H_
#define _NET_VNET_H_
#if defined(_KERNEL) || defined(_WANT_VNET)
#define VNET_SETNAME "set_vnet"
#define VNET_SYMPREFIX "vnet_entry_"
#endif
#ifdef _KERNEL
#ifdef VIMAGE
#include <sys/kernel.h>
/*
* SYSINIT/SYSUNINIT variants that provide per-vnet constructors and
* destructors.
*/
struct vnet_sysinit {
enum sysinit_sub_id subsystem;
enum sysinit_elem_order order;
sysinit_cfunc_t func;
const void *arg;
TAILQ_ENTRY(vnet_sysinit) link;
};
#define VNET_SYSINIT(ident, subsystem, order, func, arg) \
static struct vnet_sysinit ident ## _vnet_init = { \
subsystem, \
order, \
(sysinit_cfunc_t)(sysinit_nfunc_t)func, \
(arg) \
}; \
SYSINIT(vnet_init_ ## ident, subsystem, order, \
vnet_register_sysinit, &ident ## _vnet_init); \
SYSUNINIT(vnet_init_ ## ident, subsystem, order, \
vnet_deregister_sysinit, &ident ## _vnet_init)
#define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
static struct vnet_sysinit ident ## _vnet_uninit = { \
subsystem, \
order, \
(sysinit_cfunc_t)(sysinit_nfunc_t)func, \
(arg) \
}; \
SYSINIT(vnet_uninit_ ## ident, subsystem, order, \
vnet_register_sysuninit, &ident ## _vnet_uninit); \
SYSUNINIT(vnet_uninit_ ## ident, subsystem, order, \
vnet_deregister_sysuninit, &ident ## _vnet_uninit)
#if defined(__arm__)
__asm__(".section " VNET_SETNAME ", \"aw\", %progbits");
#else
__asm__(".section " VNET_SETNAME ", \"aw\", @progbits");
#endif
__asm__(".previous");
#define VNET_NAME(n) vnet_entry_##n
#define VNET_DECLARE(t, n) extern t VNET_NAME(n)
#define VNET_DEFINE(t, n) t VNET_NAME(n) __section(VNET_SETNAME) __used
#define _VNET_PTR(b, n) (__typeof(VNET_NAME(n))*) \
((b) + (uintptr_t)&VNET_NAME(n))
#define _VNET(b, n) (*_VNET_PTR(b, n))
/*
* Virtualized global variable accessor macros.
*/
#define VNET_VNET_PTR(vnet, n) _VNET_PTR((vnet)->vnet_data_base, n)
#define VNET_VNET(vnet, n) (*VNET_VNET_PTR((vnet), n))
#define VNET_PTR(n) VNET_VNET_PTR(curvnet, n)
#define VNET(n) VNET_VNET(curvnet, n)
/*
* Sysctl variants for vnet-virtualized global variables. Include
* <sys/sysctl.h> to expose these definitions.
*
* Note: SYSCTL_PROC() handler functions will need to resolve pointer
* arguments themselves, if required.
*/
#ifdef SYSCTL_OID
int vnet_sysctl_handle_int(SYSCTL_HANDLER_ARGS);
int vnet_sysctl_handle_opaque(SYSCTL_HANDLER_ARGS);
int vnet_sysctl_handle_string(SYSCTL_HANDLER_ARGS);
int vnet_sysctl_handle_uint(SYSCTL_HANDLER_ARGS);
#define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \
SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|CTLFLAG_MPSAFE|(access), \
ptr, val, vnet_sysctl_handle_int, "I", descr)
#define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \
fmt, descr) \
SYSCTL_OID(parent, nbr, name, access, ptr, arg, handler, fmt, \
descr)
#define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \
SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access), arg, \
len, vnet_sysctl_handle_string, "A", descr)
#define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access), ptr, \
sizeof(struct type), vnet_sysctl_handle_opaque, "S," #type, \
descr)
#define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \
SYSCTL_OID(parent, nbr, name, CTLTYPE_UINT|CTLFLAG_MPSAFE|(access), \
ptr, val, vnet_sysctl_handle_uint, "IU", descr)
#define VNET_SYSCTL_ARG(req, arg1) do { \
if (arg1 != NULL) \
arg1 = (void *)(TD_TO_VNET((req)->td)->vnet_data_base + \
(uintptr_t)(arg1)); \
} while (0)
#endif /* SYSCTL_OID */
/*
* Interfaces from the kernel linker.
*/
void *vnet_data_alloc(int size);
void vnet_data_copy(void *start, int size);
void vnet_data_free(void *start_arg, int size);
/*
* Interfaces for vnet setup/teardown.
*/
struct vnet;
void vnet_data_init(struct vnet *vnet);
void vnet_data_destroy(struct vnet *vnet);
void vnet_sysinit(void);
void vnet_sysuninit(void);
/*
* Interfaces for managing per-vnet constructors and destructors.
*/
void vnet_register_sysinit(void *arg);
void vnet_register_sysuninit(void *arg);
void vnet_deregister_sysinit(void *arg);
void vnet_deregister_sysuninit(void *arg);
#else /* !VIMAGE */
/*
* Versions of the VNET macros that compile to normal global variables and
* standard sysctl definitions.
*/
#define VNET_NAME(n) n
#define VNET_DECLARE(t, n) extern t n
#define VNET_DEFINE(t, n) t n
#define _VNET_PTR(b, n) &VNET_NAME(n)
#define VNET_SYSINIT(ident, subsystem, order, func, arg) \
SYSINIT(ident, subsystem, order, func, arg)
#define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
SYSUNINIT(ident, subsystem, order, func, arg)
#ifdef SYSCTL_OID
#define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \
SYSCTL_INT(parent, nbr, name, access, ptr, val, descr)
#define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \
fmt, descr) \
SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, \
descr)
#define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \
SYSCTL_STRING(parent, nbr, name, access, arg, len, descr)
#define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr)
#define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \
SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr)
#define VNET_SYSCTL_ARG(req, arg1)
#endif /* SYSCTL_OID */
/*
* Virtualized global variable accessor macros.
*/
#define VNET_VNET_PTR(vnet, n) (&(n))
#define VNET_VNET(vnet, n) (n)
#define VNET_PTR(n) (&(n))
#define VNET(n) (n)
#endif /* VIMAGE */
#endif /* _KERNEL */
#endif /* !_NET_VNET_H_ */
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