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On Sun, Oct 20, 2013 at 10:58 PM, Shriram Rajagopalan <rshriram@xxxxxxxxx> wrote:

This patch series adds support for network buffering in the Remus
codebase in libxl.

Changes in V3:
[1/5] Fix redundant checks in configure scripts
(based on Ian Campbell's suggestions)

[2/5] Introduce locking in the script, during IFB setup.
Add xenstore paths used by netbuf scripts
to xenstore-paths.markdown

[3/5] Hotplug scripts setup/teardown invocations are now asynchronous
following IanJ's feedback. However, the invocations are still
sequential.

[5/5] Allow per-domain specification of netbuffer scripts in xl remus
commmand.

And minor nits throughout the series based on feedback from
the last version

Changes in V2:
[1/5] Configure script will automatically enable/disable network
buffer support depending on the availability of the appropriate
libnl3 version. [If libnl3 is unavailable, a warning message will be
printed to let the user know that the feature has been disabled.]

use macros from pkg.m4 instead of pkg-config commands
removed redundant checks for libnl3 libraries.

[3,4/5] - Minor nits.

Version 1:

[1/5] Changes to autoconf scripts to check for libnl3. Add linker flags
to libxl Makefile.

[2/5] External script to setup/teardown network buffering using libnl3's
CLI. This script will be invoked by libxl before starting Remus.
The script's main job is to bring up an IFB device with plug qdisc
attached to it. It then re-routes egress traffic from the guest's
vif to the IFB device.

[3/5] Libxl code to invoke the external setup script, followed by netlink
related setup to obtain a handle on the output buffers attached
to each vif.

[4/5] Libxl interaction with network buffer module in the kernel via
libnl3 API.

[5/5] xl cmdline switch to explicitly enable network buffering when
starting remus.

Few things to note:

a) Based on previous email discussions, the setup/teardown task has
been moved to a hotplug style shell script which can be customized as
desired, instead of implementing it as C code inside libxl.

b) Libnl3 is not available on NetBSD. Nor is it available on CentOS
(Linux). So I have made network buffering support an optional feature
so that it can be disabled if desired.

c) NetBSD does not have libnl3. So I have put the setup script under
tools/hotplug/Linux folder.

thanks
shriram

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Re: [Xen-devel] [PATCH 0 of 5 V3] Remus/Libxl: Network buffering support