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author | rwatson <rwatson@FreeBSD.org> | 2009-07-14 22:48:30 +0000 |
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committer | rwatson <rwatson@FreeBSD.org> | 2009-07-14 22:48:30 +0000 |
commit | 57ca4583e728cab422fba8f15de10bd0b637b3dd (patch) | |
tree | 13848f891fb2f7a396281b31633563d0f764ff65 /sys/netinet6/nd6.h | |
parent | ef443476d9706035ac219f0280ef0b817dda7a6d (diff) | |
download | FreeBSD-src-57ca4583e728cab422fba8f15de10bd0b637b3dd.zip FreeBSD-src-57ca4583e728cab422fba8f15de10bd0b637b3dd.tar.gz |
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator
(DPCPU), as suggested by Peter Wemm, and implement a new per-virtual
network stack memory allocator. Modify vnet to use the allocator
instead of monolithic global container structures (vinet, ...). This
change solves many binary compatibility problems associated with
VIMAGE, and restores ELF symbols for virtualized global variables.
Each virtualized global variable exists as a "reference copy", and also
once per virtual network stack. Virtualized global variables are
tagged at compile-time, placing the in a special linker set, which is
loaded into a contiguous region of kernel memory. Virtualized global
variables in the base kernel are linked as normal, but those in modules
are copied and relocated to a reserved portion of the kernel's vnet
region with the help of a the kernel linker.
Virtualized global variables exist in per-vnet memory set up when the
network stack instance is created, and are initialized statically from
the reference copy. Run-time access occurs via an accessor macro, which
converts from the current vnet and requested symbol to a per-vnet
address. When "options VIMAGE" is not compiled into the kernel, normal
global ELF symbols will be used instead and indirection is avoided.
This change restores static initialization for network stack global
variables, restores support for non-global symbols and types, eliminates
the need for many subsystem constructors, eliminates large per-subsystem
structures that caused many binary compatibility issues both for
monitoring applications (netstat) and kernel modules, removes the
per-function INIT_VNET_*() macros throughout the stack, eliminates the
need for vnet_symmap ksym(2) munging, and eliminates duplicate
definitions of virtualized globals under VIMAGE_GLOBALS.
Bump __FreeBSD_version and update UPDATING.
Portions submitted by: bz
Reviewed by: bz, zec
Discussed with: gnn, jamie, jeff, jhb, julian, sam
Suggested by: peter
Approved by: re (kensmith)
Diffstat (limited to 'sys/netinet6/nd6.h')
-rw-r--r-- | sys/netinet6/nd6.h | 56 |
1 files changed, 36 insertions, 20 deletions
diff --git a/sys/netinet6/nd6.h b/sys/netinet6/nd6.h index 0730d84..f54e02e 100644 --- a/sys/netinet6/nd6.h +++ b/sys/netinet6/nd6.h @@ -318,28 +318,44 @@ struct nd_pfxrouter { LIST_HEAD(nd_prhead, nd_prefix); /* nd6.c */ -#ifdef VIMAGE_GLOBALS -extern int nd6_prune; -extern int nd6_delay; -extern int nd6_umaxtries; -extern int nd6_mmaxtries; -extern int nd6_useloopback; -extern int nd6_maxnudhint; -extern int nd6_gctimer; -extern struct nd_drhead nd_defrouter; -extern struct nd_prhead nd_prefix; -extern int nd6_debug; -extern int nd6_onlink_ns_rfc4861; - -extern struct callout nd6_timer_ch; +VNET_DECLARE(int, nd6_prune); +VNET_DECLARE(int, nd6_delay); +VNET_DECLARE(int, nd6_umaxtries); +VNET_DECLARE(int, nd6_mmaxtries); +VNET_DECLARE(int, nd6_useloopback); +VNET_DECLARE(int, nd6_maxnudhint); +VNET_DECLARE(int, nd6_gctimer); +VNET_DECLARE(struct nd_drhead, nd_defrouter); +VNET_DECLARE(struct nd_prhead, nd_prefix); +VNET_DECLARE(int, nd6_debug); +VNET_DECLARE(int, nd6_onlink_ns_rfc4861); +VNET_DECLARE(struct callout, nd6_timer_ch); + +#define V_nd6_prune VNET_GET(nd6_prune) +#define V_nd6_delay VNET_GET(nd6_delay) +#define V_nd6_umaxtries VNET_GET(nd6_umaxtries) +#define V_nd6_mmaxtries VNET_GET(nd6_mmaxtries) +#define V_nd6_useloopback VNET_GET(nd6_useloopback) +#define V_nd6_maxnudhint VNET_GET(nd6_maxnudhint) +#define V_nd6_gctimer VNET_GET(nd6_gctimer) +#define V_nd_defrouter VNET_GET(nd_defrouter) +#define V_nd_prefix VNET_GET(nd_prefix) +#define V_nd6_debug VNET_GET(nd6_debug) +#define V_nd6_onlink_ns_rfc4861 VNET_GET(nd6_onlink_ns_rfc4861) +#define V_nd6_timer_ch VNET_GET(nd6_timer_ch) /* nd6_rtr.c */ -extern int nd6_defifindex; -extern int ip6_desync_factor; /* seconds */ -extern u_int32_t ip6_temp_preferred_lifetime; /* seconds */ -extern u_int32_t ip6_temp_valid_lifetime; /* seconds */ -extern int ip6_temp_regen_advance; /* seconds */ -#endif /* VIMAGE_GLOBALS */ +VNET_DECLARE(int, nd6_defifindex); +VNET_DECLARE(int, ip6_desync_factor); /* seconds */ +VNET_DECLARE(u_int32_t, ip6_temp_preferred_lifetime); /* seconds */ +VNET_DECLARE(u_int32_t, ip6_temp_valid_lifetime); /* seconds */ +VNET_DECLARE(int, ip6_temp_regen_advance); /* seconds */ + +#define V_nd6_defifindex VNET_GET(nd6_defifindex) +#define V_ip6_desync_factor VNET_GET(ip6_desync_factor) +#define V_ip6_temp_preferred_lifetime VNET_GET(ip6_temp_preferred_lifetime) +#define V_ip6_temp_valid_lifetime VNET_GET(ip6_temp_valid_lifetime) +#define V_ip6_temp_regen_advance VNET_GET(ip6_temp_regen_advance) #define nd6log(x) do { if (V_nd6_debug) log x; } while (/*CONSTCOND*/ 0) |