netdev - Re: [PATCH net-next 0/3] veth: XDP stats improvement

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Date:   Mon, 15 Oct 2018 21:58:58 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     makita.toshiaki@....ntt.co.jp
Cc:     netdev@...r.kernel.org, brouer@...hat.com
Subject: Re: [PATCH net-next 0/3] veth: XDP stats improvement

From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Date: Thu, 11 Oct 2018 18:36:47 +0900

> ndo_xdp_xmit in veth did not update packet counters as described in [1].
> Also, current implementation only updates counters on tx side so rx side
> events like XDP_DROP were not collected.
> This series implements the missing accounting as well as support for
> ethtool per-queue stats in veth.
> 
> Patch 1: Update drop counter in ndo_xdp_xmit.
> Patch 2: Update packet and byte counters for all XDP path, and drop
>          counter on XDP_DROP.
> Patch 3: Support per-queue ethtool stats for XDP counters.
> 
> Note that counters are maintained on per-queue basis for XDP but not
> otherwise (per-cpu and atomic as before). This is because 1) tx path in
> veth is essentially lockless so we cannot update per-queue stats on tx,
> and 2) rx path is net core routine (process_backlog) which cannot update
> per-queue based stats when XDP is disabled. On the other hand there are
> real rxqs and napi handlers for veth XDP, so update per-queue stats on
> rx for XDP packets, and use them to calculate tx counters as well,
> contrary to the existing non-XDP counters.
> 
> [1] https://patchwork.ozlabs.org/cover/953071/#1967449
> 
> Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>

Series applied.