[ovs-dev] [PATCHv16 2/2] netdev-afxdp: add new netdev type for AF_XDP.

Ilya Maximets i.maximets at samsung.com
Wed Jul 17 15:41:48 UTC 2019

On 13.07.2019 2:50, William Tu wrote:
> The patch introduces experimental AF_XDP support for OVS netdev.
> AF_XDP, the Address Family of the eXpress Data Path, is a new Linux socket
> type built upon the eBPF and XDP technology.  It is aims to have comparable
> performance to DPDK but cooperate better with existing kernel's networking
> stack.  An AF_XDP socket receives and sends packets from an eBPF/XDP program
> attached to the netdev, by-passing a couple of Linux kernel's subsystems
> As a result, AF_XDP socket shows much better performance than AF_PACKET
> For more details about AF_XDP, please see linux kernel's
> Documentation/networking/af_xdp.rst. Note that by default, this feature is
> not compiled in.
> Signed-off-by: William Tu <u9012063 at gmail.com>
> ---

Hi Ben and William.

This patch-set has a long history and the latest versions are in a good shape.
netdev-afxdp works stable for me over the virtual interfaces and passes all the
system tests that it needs to pass. Eelco is on a PTO now, but his last
report [1] was that v14 of this patch worked fine for him in PVP tests. He had
some issues with large packets, but this is, IMO, most probably due to kernel
driver issues.

So, I'd like to ask if we're going to merge netdev-afxdp to current release?
For me it's totally fine, especially because netdev-afxdp implemented as a
completely stand-alone feature that could be easily disabled. This way more
users will be able to try and test this new feature with a 2.12 release.

I made a review with a few style related comments and 2 small issues on a
current version. If William will prepare the v17 today or tomorrow, I'll be
able to re-check it and apply while we're in a soft-freeze stage.

As an option, I could prepare v17 myself if William has no time for that.

Ben, William, what do you think?

CC Ian, as this is a big step for a userspace datapath.

[1] https://mail.openvswitch.org/pipermail/ovs-dev/2019-July/360493.html

Best regards, Ilya Maximets.

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