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From: David Ahern <dsahern@gmail.com>
To: Jason Wang <jasowang@redhat.com>,
	"xdp-newbies@vger.kernel.org" <xdp-newbies@vger.kernel.org>
Subject: Re: error loading xdp program on virtio nic
Date: Wed, 20 Nov 2019 20:35:33 -0700	[thread overview]
Message-ID: <3dc7b9d8-bcb2-1a90-630e-681cbf0f1ace@gmail.com> (raw)
In-Reply-To: <89f56317-5955-e692-fcf0-ee876aae068b@redhat.com>

On 11/20/19 8:26 PM, Jason Wang wrote:
> 
> On 2019/11/21 上午1:52, David Ahern wrote:
>> Hi:
>>
>> Trying to load an XDP program on a virtio based nic is failing with:
>>
>> virtio_net: XDP expects header/data in single page, any_header_sg
>> required
>>
>> I have not encountered this error before and not able to find what is
>> missing. Any tips?
> 
> 
> Hi David:
> 
> What qemu + guest kernel version did you use? And could you share you
> qemu cli?
> 
> Old qemu requires vnet header to be placed into a separate sg which
> breaks the assumption of XDP. Recent qemu doesn't have such limitation
> (any_header_sg feature).
> 
>

Hi Jason,

When I run qemu via my older vm-tools scripts XDP works fine. This is
the first time I am trying to use XDP with guests started by libvirt.

We isolated it to a libvirt xml file using an old machine type
(pc-i440fx-1.5) - basically any machine with VIRTIO_F_VERSION_1 not set.
Using a newer one move the problem forward.

The current error message is:
  virtio_net: Too few free TX rings available
again, looking for some libvirt setting for the vm create.

  reply	other threads:[~2019-11-21  3:35 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-20 17:52 error loading xdp program on virtio nic David Ahern
2019-11-21  3:26 ` Jason Wang
2019-11-21  3:35   ` David Ahern [this message]
2019-11-21  3:54     ` Jason Wang
2019-11-21  4:05       ` David Ahern
2019-11-21  6:26         ` Jesper Dangaard Brouer
2019-11-21  7:02           ` Jason Wang
2019-11-21 15:49             ` David Ahern
2019-11-22  6:09               ` Jason Wang
2019-11-22 15:43                 ` David Ahern
2019-11-22 16:50                   ` Jakub Kicinski
2019-11-22 16:57                   ` Jesper Dangaard Brouer
2019-11-22 17:42                     ` David Ahern
2019-11-23 13:27                       ` Toke Høiland-Jørgensen
2019-11-23 13:27                         ` Toke Høiland-Jørgensen
2019-11-25  2:42                     ` Jason Wang
2019-11-25  2:48                   ` Jason Wang

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