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

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Date:   Thu, 11 Oct 2018 18:36:47 +0900
From:   Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
        netdev@...r.kernel.org, Jesper Dangaard Brouer <brouer@...hat.com>
Subject: [PATCH net-next 0/3] veth: XDP stats improvement

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>

Toshiaki Makita (3):
  veth: Account for packet drops in ndo_xdp_xmit
  veth: Account for XDP packet statistics on rx side
  veth: Add ethtool statistics support for XDP

 drivers/net/veth.c | 175 ++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 147 insertions(+), 28 deletions(-)

-- 
1.8.3.1