netdev - Re: [net-next PATCH v3 0/6] XDP for virtio

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Date:   Wed, 30 Nov 2016 20:35:52 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     tgraf@...g.ch, shm@...ulusnetworks.com,
        alexei.starovoitov@...il.com, daniel@...earbox.net,
        davem@...emloft.net, john.r.fastabend@...el.com,
        netdev@...r.kernel.org, bblanco@...mgrid.com, brouer@...hat.com
Subject: Re: [net-next PATCH v3 0/6] XDP for virtio_net

On Tue, Nov 29, 2016 at 12:05:20PM -0800, John Fastabend wrote:
> 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.
> 
> There are some restrictions for XDP to be enabled and work well
> (see patch 3) for more details.
> 
>   1. LRO must be off
>   2. MTU must be less than PAGE_SIZE
>   3. queues must be available to dedicate to XDP
>   4. num_bufs received in mergeable buffers must be 1
>   5. big_packet mode must have all data on single page
> 
> Please review any comments/feedback welcome as always.
> 
> v2, fixes rcu usage throughout thanks to Eric and the use of
> num_online_cpus() usage thanks to Jakub.
> 
> v3, add slowpath patch to handle num_bufs > 1
> 
> Thanks,
> John

BTW this is threaded incorrectly: patch 1/6 isn't a reply to 0/6,
patches 2 and on are replies to patch 1.

I'm busy until end of week, I'll review Monday. Sorry about the delay.

> ---
> 
> John Fastabend (6):
>       net: virtio dynamically disable/enable LRO
>       net: xdp: add invalid buffer warning
>       virtio_net: Add XDP support
>       virtio_net: add dedicated XDP transmit queues
>       virtio_net: add XDP_TX support
>       virtio_net: xdp, add slowpath case for non contiguous buffers
> 
> 
>  drivers/net/virtio_net.c |  344 +++++++++++++++++++++++++++++++++++++++++++++-
>  include/linux/filter.h   |    1 
>  net/core/filter.c        |    6 +
>  3 files changed, 346 insertions(+), 5 deletions(-)
> 
> --
> Signature