Date: Wed, 15 Jul 2009 00:20:18 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: current@FreeBSD.org Subject: Rebuild all network-related kernel modules on 8-current due to vnet allocator change Message-ID: <alpine.BSF.2.00.0907150016260.54568@fledge.watson.org>
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Just a quick heads up:
The attached change, which just entered 8-current, modifies kernel programming
and binary interfaces for many network stack components/modules. You will
want to make sure all kernel modules are rebuilt.
For those willing to take a risk, here's a list of the kernel modules (and of
course the kernel) that I know are definitely affected and will want to be
rebuilt:
bridgestp.ko if_vlan.ko kernel ng_atm.ko sppp.ko
if_bridge.ko ip_mroute.ko linprocfs.ko ng_eiface.ko svr4.ko
if_ef.ko ipdivert.ko linux.ko ng_ether.ko wlan.ko
if_faith.ko ipfw.ko netgraph.ko ng_gif.ko
if_gif.ko ipfw_nat.ko nfscl.ko ng_iface.ko
if_gre.ko ipl.ko nfsclient.ko pf.ko
if_stf.ko iw_cxgb.ko nfsd.ko rdma_cma.ko
(For those interested: I grepped for vnet_entry in my local kernel module
collection -- these are kernel modules that directly reference virtualized
global network stack variables with a VIMAGE configuration).
Robert N M Watson
Computer Laboratory
University of Cambridge
---------- Forwarded message ----------
Date: Tue, 14 Jul 2009 22:48:30 +0000 (UTC)
From: Robert Watson <rwatson@FreeBSD.org>
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
svn-src-head@freebsd.org
Subject: svn commit: r195699 - in head: . sys/compat/linprocfs sys/compat/linux
sys/compat/svr4 sys/conf sys/contrib/altq/altq sys/contrib/ipfilter/netinet
sys/contrib/pf/net sys/contrib/rdma sys/ddb sys/de...
Author: rwatson
Date: Tue Jul 14 22:48:30 2009
New Revision: 195699
URL: http://svn.freebsd.org/changeset/base/195699
Log:
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)
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