linux-kernel - Re: [PATCH v2 net-next 00/26] net: introduce and use generic XDP stats

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Date:   Sun, 28 Nov 2021 15:23:41 -0700
From:   David Ahern <dsahern@...il.com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     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>,
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        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>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Cong Wang <cong.wang@...edance.com>, netdev@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, bpf@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 net-next 00/26] net: introduce and use generic XDP
 stats

On 11/23/21 9:39 AM, Alexander Lobakin wrote:
> This is an almost complete rework of [0].
> 
> This series introduces generic XDP statistics infra based on rtnl
> xstats (Ethtool standard stats previously), and wires up the drivers
> which collect appropriate statistics to this new interface. Finally,
> it introduces XDP/XSK statistics to all XDP-capable Intel drivers.
> 
> Those counters are:
> * packets: number of frames passed to bpf_prog_run_xdp().
> * bytes: number of bytes went through bpf_prog_run_xdp().
> * errors: number of general XDP errors, if driver has one unified
>   counter.
> * aborted: number of XDP_ABORTED returns.
> * drop: number of XDP_DROP returns.
> * invalid: number of returns of unallowed values (i.e. not XDP_*).
> * pass: number of XDP_PASS returns.
> * redirect: number of successfully performed XDP_REDIRECT requests.
> * redirect_errors: number of failed XDP_REDIRECT requests.
> * tx: number of successfully performed XDP_TX requests.
> * tx_errors: number of failed XDP_TX requests.
> * xmit_packets: number of successfully transmitted XDP/XSK frames.
> * xmit_bytes: number of successfully transmitted XDP/XSK frames.
> * xmit_errors: of XDP/XSK frames failed to transmit.
> * xmit_full: number of XDP/XSK queue being full at the moment of
>   transmission.
> 
> To provide them, developers need to implement .ndo_get_xdp_stats()
> and, if they want to expose stats on a per-channel basis,
> .ndo_get_xdp_stats_nch(). include/net/xdp.h contains some helper

Why the tie to a channel? There are Rx queues and Tx queues and no
requirement to link them into a channel. It would be better (more
flexible) to allow them to be independent. Rather than ask the driver
"how many channels", ask 'how many Rx queues' and 'how many Tx queues'
for which xdp stats are reported.

>From there, allow queue numbers or queue id's to be non-consecutive and
add a queue id or number as an attribute. e.g.,

[XDP stats]
	[ Rx queue N]
		counters


	[ Tx queue N]
		counters

This would allow a follow on patch set to do something like "Give me XDP
stats for Rx queue N" instead of doing a full dump.