On Mon, 10 Apr 2017 12:18:33 -0400
Julien Desfossez <ju@xxxxxxxxxx> wrote:
> > > Hi,
> > >
> > > Following the presentation of Jesper on XDP, I have been trying to
> > > make the example work on KVM with virtio_net (and yes you are right,
> > > people try stuff when it is on github :-) ).
> >
> > Great to hear you pulled my github repo :-)
> >
> > > I am testing on an Ubuntu 17.04 VM, I recompiled the 4.10 kernel,
> > > the code from the example compiles fine, but I get into trouble when
> > > trying to load the bpf/xdp code.
> > >
> > > The first error I get is: virtio_net virtio0 enp0s3: can't set XDP
> > > while host is implementing LRO, disable LRO first
> > >
> > > I have tried to disable the various features checked in this code
> > > with ethtool, but it seems to check if the feature is available, not
> > > necessarily enabled and I have no idea how to make those features
> > > not available.
> > >
> > > I tried to comment the check to see if it would go somewhere, but
> > > then I got into a problem with the number of queues available (4
> > > vCPUs): virtio_net virtio0 enp0s3: request 5 queues but max is 1 And
> > > I don't know how to add more queues (I am launching the VM with
> > > libvirt/virt-manager).
> > >
> > > So my question is: do you have a recipe that works well to test this
> > > virtio_net + XDP feature ? Does the physical host need a special
> > > configuration ? Right now it is just a standard Ubuntu 16.04 (4.4
> > > kernel and libvirt 1.3.1).
> >
> > I have not tried to get XDP working on virtio_net ... but I'm hoping
> > John or Michael can provide some more info on this?
>
> Ok, I managed to solve the problem with the number of queues. Now with
> the checks for TSO, ECN and UFO commented in virtio_net.c, the
> xdp_ddos01_blacklist program works :-)
>
> So now, all I need is to make this check pass:
> if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
> virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
> virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
> virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO)) {
> netdev_warn(dev, "can't set XDP while host is implementing LRO, disable LRO first\n");
> return -EOPNOTSUPP;
> }
>
> I know running ethtool commands to disable those features does not change the
> result.
>
> If you have an idea on how to solve this problem that would be great.
Maybe someone on the xdp-newbies@xxxxxxxxxxxxxxx list can help?
(p.s. I will be flying out of Montreal heading home in approx 30 min)
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
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