netdev - Re: consistency for statistics with XDP mode

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Date:   Tue, 27 Nov 2018 16:04:49 +0900
From:   Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:     David Ahern <dsahern@...il.com>,
        "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 2018/11/26 10:37, Toshiaki Makita wrote:
> On 2018/11/23 1:43, David Ahern wrote:
>> 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?
> 
> hoping I can make some time within a couple of days.

Hmm... It looks like free_old_xmit_skbs() calls dev_consume_skb_any()
for xdp_frame when napi_tx is enabled. I will fix this beforehand.

-- 
Toshiaki Makita