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Subject: Re: error loading xdp program on virtio nic
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From: Jason Wang <jasowang@redhat.com>
Message-ID: <4686849f-f3b8-dd1d-0fe4-3c176a37b67a@redhat.com>
Date: Thu, 21 Nov 2019 15:02:25 +0800
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To: Jesper Dangaard Brouer <brouer@redhat.com>, David Ahern <dsahern@gmail.com>
Cc: "xdp-newbies@vger.kernel.org" <xdp-newbies@vger.kernel.org>


On 2019/11/21 =E4=B8=8B=E5=8D=882:26, Jesper Dangaard Brouer wrote:
> On Wed, 20 Nov 2019 21:05:48 -0700
> David Ahern <dsahern@gmail.com> wrote:
>
>> On 11/20/19 8:54 PM, Jason Wang wrote:
>>>> The current error message is:
>>>>  =C2=A0=C2=A0 virtio_net: Too few free TX rings available
>>>> again, looking for some libvirt setting for the vm create.
>>>>  =20
>>> Make sure you have sufficient queues, e.g if you N vcpus with multiqueu=
e
>>> enabled, you need 2*N queues for virtio-net.
>> yep, that did the trick and now I can attach xdp programs. Thanks for
>> the help.
> How did you configure number of queues in libbvirt?
>

By specifying queues property like:

<devices>

 =C2=A0 <interface type=3D'network'>
 =C2=A0=C2=A0=C2=A0 <source network=3D'default'/>
 =C2=A0=C2=A0=C2=A0 <target dev=3D'vnet1'/>
 =C2=A0=C2=A0=C2=A0 <model type=3D'virtio'/>
 =C2=A0=C2=A0=C2=A0 <driver name=3D'vhost' txmode=3D'iothread' ioeventfd=3D=
'on'=20
event_idx=3D'off' queues=3D'5' rx_queue_size=3D'256' tx_queue_size=3D'256'>
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <host csum=3D'off' gso=3D'off' tso4=3D'off'=
 tso6=3D'off' ecn=3D'off'=20
ufo=3D'off' mrg_rxbuf=3D'off'/>
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <guest csum=3D'off' tso4=3D'off' tso6=3D'of=
f' ecn=3D'off' ufo=3D'off'/>
 =C2=A0=C2=A0=C2=A0 </driver>
 =C2=A0=C2=A0=C2=A0 </interface>
</devices>


More information is here: https://libvirt.org/formatdomain.html

Thanks