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.toshi...@lab.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
