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

Ilya Maximets i.maximets at samsung.com
Wed Jul 17 15:54:32 UTC 2019

On 17.07.2019 18:47, William Tu wrote:
> On Wed, Jul 17, 2019 at 8:41 AM Ilya Maximets <i.maximets at samsung.com> wrote:
>> 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?
> Hi Ilya,
> Thanks a lot for your help on reviewing all these versions, and also
> Eelco's review and testing. I will prepare v17 today.

Cool. Please, also add the NEWS entry to the patch about new experimental
netdev type.

> Regards,
> William
>> 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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