d0728d7174
network stacks, VNET_SYSINIT: - Add VNET_SYSINIT and VNET_SYSUNINIT macros to declare events that will occur each time a network stack is instantiated and destroyed. In the !VIMAGE case, these are simply mapped into regular SYSINIT/SYSUNINIT. For the VIMAGE case, we instead use SYSINIT's to track their order and properties on registration, using them for each vnet when created/ destroyed, or immediately on module load for already-started vnets. - Remove vnet_modinfo mechanism that existed to serve this purpose previously, as well as its dependency scheme: we now just use the SYSINIT ordering scheme. - Implement VNET_DOMAIN_SET() to allow protocol domains to declare that they want init functions to be called for each virtual network stack rather than just once at boot, compiling down to DOMAIN_SET() in the non-VIMAGE case. - Walk all virtualized kernel subsystems and make use of these instead of modinfo or DOMAIN_SET() for init/uninit events. In some cases, convert modular components from using modevent to using sysinit (where appropriate). In some cases, do minor rejuggling of SYSINIT ordering to make room for or better manage events. Portions submitted by: jhb (VNET_SYSINIT), bz (cleanup) Discussed with: jhb, bz, julian, zec Reviewed by: bz Approved by: re (VIMAGE blanket)
217 lines
7.4 KiB
C
217 lines
7.4 KiB
C
/*-
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* Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
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* Copyright (c) 2009 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This is the virtual network stack memory allocator, which provides support
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* for virtualized global variables via a special linker set, set_vnet. When
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* "options VIMAGE" isn't defined, virtualized global variables are compiled
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* as normal globals.
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*/
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#ifndef _NET_VNET_H_
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#define _NET_VNET_H_
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#if defined(_KERNEL) || defined(_WANT_VNET)
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#define VNET_SETNAME "set_vnet"
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#define VNET_SYMPREFIX "vnet_entry_"
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#endif
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#ifdef _KERNEL
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#ifdef VIMAGE
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#include <sys/kernel.h>
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/*
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* SYSINIT/SYSUNINIT variants that provide per-vnet constructors and
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* destructors.
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*/
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struct vnet_sysinit {
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enum sysinit_sub_id subsystem;
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enum sysinit_elem_order order;
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sysinit_cfunc_t func;
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const void *arg;
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TAILQ_ENTRY(vnet_sysinit) link;
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};
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#define VNET_SYSINIT(ident, subsystem, order, func, arg) \
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static struct vnet_sysinit ident ## _vnet_init = { \
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subsystem, \
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order, \
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(sysinit_cfunc_t)(sysinit_nfunc_t)func, \
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(arg) \
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}; \
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SYSINIT(vnet_init_ ## ident, subsystem, order, \
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vnet_register_sysinit, &ident ## _vnet_init); \
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SYSUNINIT(vnet_init_ ## ident, subsystem, order, \
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vnet_deregister_sysinit, &ident ## _vnet_init)
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#define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
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static struct vnet_sysinit ident ## _vnet_uninit = { \
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subsystem, \
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order, \
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(sysinit_cfunc_t)(sysinit_nfunc_t)func, \
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(arg) \
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}; \
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SYSINIT(vnet_uninit_ ## ident, subsystem, order, \
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vnet_register_sysuninit, &ident ## _vnet_uninit); \
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SYSUNINIT(vnet_uninit_ ## ident, subsystem, order, \
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vnet_deregister_sysuninit, &ident ## _vnet_uninit)
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#if defined(__arm__)
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__asm__(".section " VNET_SETNAME ", \"aw\", %progbits");
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#else
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__asm__(".section " VNET_SETNAME ", \"aw\", @progbits");
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#endif
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__asm__(".previous");
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#define VNET_NAME(n) vnet_entry_##n
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#define VNET_DECLARE(t, n) extern t VNET_NAME(n)
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#define VNET_DEFINE(t, n) t VNET_NAME(n) __section(VNET_SETNAME) __used
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#define _VNET_PTR(b, n) (__typeof(VNET_NAME(n))*) \
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((b) + (uintptr_t)&VNET_NAME(n))
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#define _VNET(b, n) (*_VNET_PTR(b, n))
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/*
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* Virtualized global variable accessor macros.
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*/
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#define VNET_VNET_PTR(vnet, n) _VNET_PTR((vnet)->vnet_data_base, n)
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#define VNET_VNET(vnet, n) (*VNET_VNET_PTR((vnet), n))
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#define VNET_PTR(n) VNET_VNET_PTR(curvnet, n)
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#define VNET(n) VNET_VNET(curvnet, n)
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/*
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* Sysctl variants for vnet-virtualized global variables. Include
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* <sys/sysctl.h> to expose these definitions.
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*
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* Note: SYSCTL_PROC() handler functions will need to resolve pointer
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* arguments themselves, if required.
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*/
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#ifdef SYSCTL_OID
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int vnet_sysctl_handle_int(SYSCTL_HANDLER_ARGS);
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int vnet_sysctl_handle_opaque(SYSCTL_HANDLER_ARGS);
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int vnet_sysctl_handle_string(SYSCTL_HANDLER_ARGS);
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int vnet_sysctl_handle_uint(SYSCTL_HANDLER_ARGS);
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#define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \
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SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|CTLFLAG_MPSAFE|(access), \
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ptr, val, vnet_sysctl_handle_int, "I", descr)
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#define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \
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fmt, descr) \
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SYSCTL_OID(parent, nbr, name, access, ptr, arg, handler, fmt, \
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descr)
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#define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \
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SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access), arg, \
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len, vnet_sysctl_handle_string, "A", descr)
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#define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
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SYSCTL_OID(parent, nbr, name, CTLTYPE_OPAQUE|(access), ptr, \
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sizeof(struct type), vnet_sysctl_handle_opaque, "S," #type, \
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descr)
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#define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \
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SYSCTL_OID(parent, nbr, name, CTLTYPE_UINT|CTLFLAG_MPSAFE|(access), \
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ptr, val, vnet_sysctl_handle_uint, "IU", descr)
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#define VNET_SYSCTL_ARG(req, arg1) do { \
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if (arg1 != NULL) \
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arg1 = (void *)(TD_TO_VNET((req)->td)->vnet_data_base + \
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(uintptr_t)(arg1)); \
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} while (0)
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#endif /* SYSCTL_OID */
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/*
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* Interfaces from the kernel linker.
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*/
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void *vnet_data_alloc(int size);
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void vnet_data_copy(void *start, int size);
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void vnet_data_free(void *start_arg, int size);
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/*
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* Interfaces for vnet setup/teardown.
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*/
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struct vnet;
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void vnet_data_init(struct vnet *vnet);
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void vnet_data_destroy(struct vnet *vnet);
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void vnet_sysinit(void);
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void vnet_sysuninit(void);
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/*
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* Interfaces for managing per-vnet constructors and destructors.
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*/
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void vnet_register_sysinit(void *arg);
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void vnet_register_sysuninit(void *arg);
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void vnet_deregister_sysinit(void *arg);
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void vnet_deregister_sysuninit(void *arg);
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#else /* !VIMAGE */
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/*
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* Versions of the VNET macros that compile to normal global variables and
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* standard sysctl definitions.
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*/
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#define VNET_NAME(n) n
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#define VNET_DECLARE(t, n) extern t n
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#define VNET_DEFINE(t, n) t n
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#define _VNET_PTR(b, n) &VNET_NAME(n)
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#define VNET_SYSINIT(ident, subsystem, order, func, arg) \
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SYSINIT(ident, subsystem, order, func, arg)
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#define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
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SYSUNINIT(ident, subsystem, order, func, arg)
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#ifdef SYSCTL_OID
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#define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \
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SYSCTL_INT(parent, nbr, name, access, ptr, val, descr)
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#define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \
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fmt, descr) \
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SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, \
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descr)
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#define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \
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SYSCTL_STRING(parent, nbr, name, access, arg, len, descr)
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#define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
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SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr)
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#define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \
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SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr)
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#define VNET_SYSCTL_ARG(req, arg1)
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#endif /* SYSCTL_OID */
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/*
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* Virtualized global variable accessor macros.
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*/
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#define VNET_VNET_PTR(vnet, n) (&(n))
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#define VNET_VNET(vnet, n) (n)
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#define VNET_PTR(n) (&(n))
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#define VNET(n) (n)
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#endif /* VIMAGE */
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#endif /* _KERNEL */
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#endif /* !_NET_VNET_H_ */
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