netdev - Re: consistency for statistics with XDP mode

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Date:   Thu, 22 Nov 2018 09:43:15 -0700
From:   David Ahern <dsahern@...il.com>
To:     Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     Paweł Staszewski <pstaszewski@...are.pl>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        David Miller <davem@...emloft.net>
Subject: Re: consistency for statistics with XDP mode

On 11/21/18 5:53 PM, Toshiaki Makita wrote:
>> We really need consistency in the counters and at a minimum, users
>> should be able to track packet and byte counters for both Rx and Tx
>> including XDP.
>>
>> It seems to me the Rx and Tx packet, byte and dropped counters returned
>> for the standard device stats (/proc/net/dev, ip -s li show, ...) should
>> include all packets managed by the driver regardless of whether they are
>> forwarded / dropped in XDP or go up the Linux stack. This also aligns
> 
> Agreed. When I introduced virtio_net XDP counters, I just forgot to
> update tx packets/bytes counters on ndo_xdp_xmit. Probably I thought it
> is handled by free_old_xmit_skbs.

Do you have some time to look at adding the Tx counters to virtio_net?