91d88eeb10
Since we have all infrastructure in place now, allow atomic live updates on program arrays. This can be very useful e.g. in case programs that are being tail-called need to be replaced, f.e. when classifier functionality needs to be changed, new protocols added/removed during runtime, etc. Thus, provide a way for in-place code updates, minimal example: Given is an object file cls.o that contains the entry point in section 'classifier', has a globally pinned program array 'jmp' with 2 slots and id of 0, and two tail called programs under section '0/0' (prog array key 0) and '0/1' (prog array key 1), the section encoding for the loader is <id/key>. Adding the filter loads everything into cls_bpf: tc filter add dev foo parent ffff: bpf da obj cls.o Now, the program under section '0/1' needs to be replaced with an updated version that resides in the same section (also full path to tc's subfolder of the mount point can be passed, e.g. /sys/fs/bpf/tc/globals/jmp): tc exec bpf graft m:globals/jmp obj cls.o sec 0/1 In case the program resides under a different section 'foo', it can also be injected into the program array like: tc exec bpf graft m:globals/jmp key 1 obj cls.o sec foo If the new tail called classifier program is already available as a pinned object somewhere (here: /sys/fs/bpf/tc/progs/parser), it can be injected into the prog array like: tc exec bpf graft m:globals/jmp key 1 fd m:progs/parser In the kernel, the program on key 1 is being atomically replaced and the old one's refcount dropped. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> |
||
|---|---|---|
| bridge | ||
| doc | ||
| etc/iproute2 | ||
| examples | ||
| genl | ||
| include | ||
| ip | ||
| lib | ||
| man | ||
| misc | ||
| netem | ||
| tc | ||
| testsuite | ||
| tipc | ||
| .gitignore | ||
| COPYING | ||
| Makefile | ||
| README | ||
| README.decnet | ||
| README.devel | ||
| README.distribution | ||
| README.iproute2+tc | ||
| README.lnstat | ||
| configure | ||
README
This is a set of utilities for Linux networking.
Information:
http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2
Download:
http://www.kernel.org/pub/linux/utils/net/iproute2/
Repository:
git://git.kernel.org/pub/scm/linux/kernel/git/shemminger/iproute2.git
How to compile this.
--------------------
1. libdbm
arpd needs to have the db4 development libraries. For Debian
users this is the package with a name like libdb4.x-dev.
DBM_INCLUDE points to the directory with db_185.h which
is the include file used by arpd to get to the old format Berkeley
database routines. Often this is in the db-devel package.
2. make
The makefile will automatically build a Config file which
contains whether or not ATM is available, etc.
3. To make documentation, cd to doc/ directory , then
look at start of Makefile and set correct values for
PAGESIZE=a4 , ie: a4 , letter ... (string)
PAGESPERPAGE=2 , ie: 1 , 2 ... (numeric)
and make there. It assumes, that latex, dvips and psnup
are in your path.
4. This package includes matching sanitized kernel headers because
the build environment may not have up to date versions. See Makefile
if you have special requirements and need to point at different
kernel include files.
Stephen Hemminger
stephen@networkplumber.org
Alexey Kuznetsov
kuznet@ms2.inr.ac.ru