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

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Date:   Wed, 30 Nov 2016 10:41:04 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     "Michael S. Tsirkin" <mst@...hat.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 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.

> 
>> ---
>>
>> 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