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Date:   Wed, 30 Nov 2016 20:26:17 -0800
From:   John Fastabend <>
To:     "Michael S. Tsirkin" <>
Subject: Re: [net-next PATCH v3 0/6] XDP for virtio_net

On 16-11-30 10:56 AM, Michael S. Tsirkin wrote:
> On Wed, Nov 30, 2016 at 10:41:04AM -0800, John Fastabend wrote:
>> On 16-11-30 10:35 AM, Michael S. Tsirkin wrote:
>>> 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.
>> Ah yep, if you mangle the command line git will send the
>> cover letter even if you have mangled 'to' email addresses but when
>> it hits a real patch it aborts. At least on my version of git.
>>> I'm busy until end of week, I'll review Monday. Sorry about the delay.
>> In the meantime I'll post a v4 with better commit message (Alexei) and
>> address a corner cases Jakub pointed out.
> I did a quick look and found some too, but a detailed review will
> have to wait till next week.

Thanks! I'll address all the comments and have a v4 by then.

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