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Date: Wed, 11 Mar 2026 20:26:39 +0100
From: Andrew Lunn <andrew@lunn.ch>
To: Maxime Chevallier <maxime.chevallier@bootlin.com>
Cc: =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= <bjorn@kernel.org>,
	netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>,
	Andrew Lunn <andrew+netdev@lunn.ch>,
	Donald Hunter <donald.hunter@gmail.com>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>,
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	Saeed Mahameed <saeedm@nvidia.com>, Shuah Khan <shuah@kernel.org>,
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	Willem de Bruijn <willemb@google.com>, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, linux-rdma@vger.kernel.org
Subject: Re: [PATCH net-next 02/11] ethtool: Add loopback netlink UAPI
 definitions
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 <b3825c0d-02e5-4625-831f-4346ce4eabd2@lunn.ch>
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In-Reply-To: <085bb0a9-85d3-4d62-9ac4-3461b61da5f3@bootlin.com>

> So, the same name + depth ?
> 
>  +---|-PHY+
>  |   |    |
>  | SerDes |
>  |   |    |
>  |  PCS   | component = PHY, name = "pcs", depth = 0
>  |   |    |
>  |  MAC   |
>  |   |    |
>  | packet |
>  | buffer |
>  |   |    |
>  |  MAC   |
>  |   |    |
>  |  PCS   | component = PHY, name = "pcs", depth = 1
>  |   |    |
>  |  PMA   |
>  |   |    |
>  |  PMD   |
>  +---|----+
>      |
>      v 10GBaseT
> 
> For that we have what we need with phy_link_topology, as each PHY has
> its index, we should be good to go in that regard hopefully :)

So depth would be local to a component? We could have two PHY
components, each with a different index, and depth = 0?

I _think_ Jakub's depth was more at a global level? But then it would
need to be passed down as we do the enumeration.

     Andrew