Re: [net-next PATCH v5 0/6] XDP for virtio_net

On Thu, Dec 08, 2016 at 02:17:02PM -0500, David Miller wrote:

From: John Fastabend <john.fastabend@gmail.com>
Date: Wed, 07 Dec 2016 12:10:47 -0800

quoted

This implements virtio_net for the mergeable buffers and big_packet
modes. I tested this with vhost_net running on qemu and did not see
any issues. For testing num_buf > 1 I added a hack to vhost driver
to only but 100 bytes per buffer.

 ...

So where are we with this?

I'm not too thrilled with the idea of making XDP_TX optional or
something like that.  If someone enables XDP, there is a tradeoff.

The issue is inability of XDP TX to share xmit queues with net stack.
I'm guessing virtio is not the only card that has a limited
number of queues, is it? Is it really so hard to lock the queue
and check it's running? Could be optional in case resources are there
...

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MST