netdev - Re: [PATCH net] virtio_net: Account for tx bytes and packets on sending xdp

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Date:   Fri, 8 Feb 2019 17:02:41 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Saeed Mahameed <saeedm@...lanox.com>
Cc:     "dsahern@...il.com" <dsahern@...il.com>,
        "thoiland@...hat.com" <thoiland@...hat.com>,
        "hawk@...nel.org" <hawk@...nel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "borkmann@...earbox.net" <borkmann@...earbox.net>,
        Tariq Toukan <tariqt@...lanox.com>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "jakub.kicinski@...ronome.com" <jakub.kicinski@...ronome.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "makita.toshiaki@....ntt.co.jp" <makita.toshiaki@....ntt.co.jp>,
        brouer@...hat.com
Subject: Re: [PATCH net] virtio_net: Account for tx bytes and packets on
 sending xdp_frames

On Wed, 6 Feb 2019 00:06:33 +0000 Saeed Mahameed <saeedm@...lanox.com> wrote:

> 2) Driver should keep track of XDP decisions statistics, report them in
> ethtool and in the new API suggested by David. track even (XDP_PASS) ?
> 
> Maybe instead of having all drivers track the statistics on their own,
> we should move the responsibility to upper layer.
> 
> Idea: since we already have rxq_info structure per XDP ring (no false
> sharing) and available per xdp_buff we can do:
> 
> +++ b/include/linux/filter.h
> @@ -651,7 +651,9 @@ static __always_inline u32 bpf_prog_run_xdp(const
> struct bpf_prog *prog,
>          * already takes rcu_read_lock() when fetching the program, so
>          * it's not necessary here anymore.
>          */
> -       return BPF_PROG_RUN(prog, xdp);
> +       u32 ret = BPF_PROG_RUN(prog, xdp);
> +       xdp->xdp_rxq_info.stats[ret]++
> +       return ret;
>  }
> 
> still we need a way (API) to report the rxq_info to whoever needs to
> read current XDP stats 

I'm capturing this as tasks under the XDP-project github page:
 https://github.com/xdp-project/xdp-project/pull/13/files

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer