netdev - Re: [PATCH v2 net-next 05/26] enetc: implement generic XDP stats callbacks

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Date:   Wed, 24 Nov 2021 12:37:11 +0100
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Corbet <corbet@....net>,
        "Shay Agroskin" <shayagr@...zon.com>,
        Arthur Kiyanovski <akiyano@...zon.com>,
        "David Arinzon" <darinzon@...zon.com>,
        Noam Dagan <ndagan@...zon.com>,
        "Saeed Bishara" <saeedb@...zon.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        "Claudiu Manoil" <claudiu.manoil@....com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Russell King <linux@...linux.org.uk>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "Jesper Dangaard Brouer" <hawk@...nel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Edward Cree <ecree.xilinx@...il.com>,
        Martin Habets <habetsm.xilinx@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "Andrii Nakryiko" <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Yajun Deng <yajun.deng@...ux.dev>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        David Ahern <dsahern@...nel.org>,
        Andrei Vagin <avagin@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Cong Wang <cong.wang@...edance.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH v2 net-next 05/26] enetc: implement generic XDP stats callbacks

From: Vladimir Oltean <vladimir.oltean@....com>
Date: Tue, 23 Nov 2021 17:09:20 +0000

> On Tue, Nov 23, 2021 at 05:39:34PM +0100, Alexander Lobakin wrote:
> > Similarly to dpaa2, enetc stores 5 per-channel counters for XDP.
> > Add necessary callbacks to be able to access them using new generic
> > XDP stats infra.
> >
> > Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> > Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> > ---
> 
> Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>

Thanks!

> These counters can be dropped from ethtool, nobody depends on having
> them there.

Got it, thanks. I'll remove them in v3 or, in case v2 gets accepted,
will send a follow-up patch(es) for removing redundant Ethtool
stats.

> Side question: what does "nch" stand for?

"The number of channels". I was thinking of an intuitial, but short
term, as get_xdp_stats_channels is too long and breaks Tab aligment
of tons of net_device_ops across the tree.
It was "nqs" /number of queues/ previously, but we usually use term
"queue" referring to one-direction ring, in case of these stats and
XDP in general "queue pair" or simply "channel" is more correct.

Thanks,
Al