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From: Maxime Chevallier <maxime.chevallier@bootlin.com>
To: "Björn Töpel" <bjorn@kernel.org>, "Jakub Kicinski" <kuba@kernel.org>
Cc: Andrew Lunn <andrew@lunn.ch>,
	netdev@vger.kernel.org, Donald Hunter <donald.hunter@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
	Saeed Mahameed <saeedm@nvidia.com>,
	Tariq Toukan <tariqt@nvidia.com>,
	Leon Romanovsky <leon@kernel.org>,
	Andrew Lunn <andrew+netdev@lunn.ch>,
	Michael Chan <michael.chan@broadcom.com>,
	Hariprasad Kelam <hkelam@marvell.com>,
	Ido Schimmel <idosch@nvidia.com>,
	Danielle Ratson <danieller@nvidia.com>,
	linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org
Subject: Re: [RFC net-next 0/4] ethtool: CMIS module diagnostic loopback support
Date: Wed, 25 Feb 2026 11:22:19 +0100	[thread overview]
Message-ID: <71848101-e97c-4674-ad07-aec720123d64@bootlin.com> (raw)
In-Reply-To: <CAJ+HfNgXqpqDYsmAa-mpHnO82aDgC7XbyVw3TmXk-ySFmGA-JQ@mail.gmail.com>

Hi Björn,

On 22/02/2026 20:58, Björn Töpel wrote:

> # # Simple MAC loopback:
> # ethtool --set-loopback eth0 mac (Defaults: lanes=all, dir=near)
> # # Specific SerDes (PMA) lane:
> # ethtool --set-loopback eth0 pma:lane0
> # # Complex multi-layer (PMA Near + PMD Far):
> # ethtool --set-loopback eth0 pma:0x1:near pmd:all:far
> # # Disable all loopbacks:
> ethtool --set-loopback eth0 off
> 
> Thoughts? Is this somewhat close to what you had in mind, Andrew?
> 
> I'm far from an expert on the details here, so the folks with more
> knowledge, please chime in!

I'm very sorry not to have looked into this yet, I'm having some family
events to handle right-now but I hope to be back next monday to take a
close look at this :)

Thanks for this work,

Maxime


  parent reply	other threads:[~2026-02-25 10:22 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-19 13:00 [RFC net-next 0/4] ethtool: CMIS module diagnostic loopback support Björn Töpel
2026-02-19 13:00 ` [RFC net-next 1/4] ethtool: module: Define CMIS loopback YAML spec and UAPI Björn Töpel
2026-02-19 13:00 ` [RFC net-next 2/4] ethtool: module: Add CMIS loopback GET/SET support Björn Töpel
2026-02-19 15:59   ` Andrew Lunn
2026-02-19 13:00 ` [RFC net-next 3/4] ethtool: module: refactor fw flash init to reuse CMIS helpers Björn Töpel
2026-02-19 13:00 ` [RFC net-next 4/4] net/mlx5e: Implement set_module_eeprom_by_page ethtool callback Björn Töpel
2026-02-19 13:16 ` [RFC net-next 0/4] ethtool: CMIS module diagnostic loopback support Björn Töpel
2026-02-19 15:51 ` Andrew Lunn
2026-02-20  0:05   ` Jakub Kicinski
2026-02-20 14:18     ` Andrew Lunn
2026-02-20 21:12       ` Jakub Kicinski
2026-02-22 19:58         ` Björn Töpel
2026-02-23 14:30           ` Andrew Lunn
2026-02-23 14:41             ` Björn Töpel
2026-02-23 23:04           ` Jakub Kicinski
2026-02-24 10:28             ` Björn Töpel
2026-02-25  4:04               ` Andrew Lunn
2026-02-25  8:39                 ` Björn Töpel
2026-02-25 13:14                   ` Andrew Lunn
2026-03-02  9:00                     ` Maxime Chevallier
2026-03-04 15:52                       ` Björn Töpel
2026-03-04 16:09                         ` Maxime Chevallier
2026-02-25 10:22           ` Maxime Chevallier [this message]
2026-02-25 11:20             ` Björn Töpel
2026-02-20  8:11   ` Björn Töpel

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