netdev - [PATCH net-next v2 0/7] net: ethtool: Introduce ethnl dump helpers

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Message-ID: <20250308155440.267782-1-maxime.chevallier@bootlin.com>
Date: Sat,  8 Mar 2025 16:54:32 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: davem@...emloft.net,
	Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	thomas.petazzoni@...tlin.com,
	linux-arm-kernel@...ts.infradead.org,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Herve Codina <herve.codina@...tlin.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Köry Maincent <kory.maincent@...tlin.com>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Simon Horman <horms@...nel.org>,
	Romain Gantois <romain.gantois@...tlin.com>,
	Piergiorgio Beruto <piergiorgio.beruto@...il.com>,
	Stanislav Fomichev <sdf@...ichev.me>
Subject: [PATCH net-next v2 0/7] net: ethtool: Introduce ethnl dump helpers

Hi everyone,

This is V2 for the ethnl dump support, allowing better handling of
per-phy dump but also any other dump operation that needs to dump more
than one message per netdev.

Changes in V2:
 - Rebased on the netdev_lock work by Stanislav and the fixes from Eric
 - Fixed a bissectability issue
 - Fixed kdoc for the new ethnl ops and fields

V1: https://lore.kernel.org/netdev/20250305141938.319282-1-maxime.chevallier@bootlin.com/

As of today when using ethnl's default ops, the DUMP requests will
simply perform a GET for each netdev.

That hits limitations for commands that may return multiple messages for
a single netdev, such as :

 - RSS (listing contexts)
 - All PHY-specific commands (PLCA, PSE-PD, phy)
 - tsinfo (one item for the netdev +  one per phy)

 Commands that need a non-default DUMP support have to re-implement
 ->dumpit() themselves, which prevents using most of ethnl's internal
 circuitry.

This series therefore introduces a better support for dump operations in
ethnl.

The patches 1 and 2 introduce the support for filtered DUMPs, where an
ifindex/ifname can be passed in the request header for the DUMP
operation. This is for when we want to dump everything a netdev
supports, but without doing so for every single netdev. ethtool's
"--show-phys ethX" option for example performs a filtered dump.

Patch 3 introduces 3 new ethnl ops : 
 ->dump_start() to initialize a dump context
 ->dump_one_dev(), that can be implemented per-command to dump
 everything on a given netdev
 ->dump_done() to release the context

The default behaviour for dumps remains the same, calling the whole
->doit() path for each netdev.

Patch 4 introduces a set of ->dump_start(), ->dump_one_dev() and
->dump_done() callback implementations that can simply be plugged into
the existing commands that list objects per-phy, making the 
phy-targeting command behaviour more coherent.

Patch 5 uses that new set of helpers to rewrite the phy.c support, which
now uses the regulat ethnl_ops instead of fully custom genl ops. This
one is the hardest to review, sorry about that, I couldn't really manage
to incrementally rework that file :(

Patches 6 and 7 are where the new dump infra shines, adding per-netdev
per-phy dump support for PLCA and PSE-PD.

We could also consider converting tsinfo/tsconfig, rss and tunnels to
these new ->dump_***() operations as well, but that's out of this
series' scope.

Maxime Chevallier (7):
  net: ethtool: netlink: Allow per-netdevice DUMP operations
  net: ethtool: netlink: Rename ethnl_default_dump_one
  net: ethtool: netlink: Introduce command-specific dump_one_dev
  net: ethtool: netlink: Introduce per-phy DUMP helpers
  net: ethtool: phy: Convert the PHY_GET command to generic phy dump
  net: ethtool: plca: Use per-PHY DUMP operations
  net: ethtool: pse-pd: Use per-PHY DUMP operations

 net/ethtool/netlink.c | 165 ++++++++++++++------
 net/ethtool/netlink.h |  47 +++++-
 net/ethtool/phy.c     | 343 ++++++++++++------------------------------
 net/ethtool/plca.c    |  12 ++
 net/ethtool/pse-pd.c  |   6 +
 5 files changed, 280 insertions(+), 293 deletions(-)

-- 
2.48.1