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Date: Thu, 9 Apr 2026 19:59:50 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Lorenzo Bianconi <lorenzo@kernel.org>
Cc: Andrew Lunn <andrew+netdev@lunn.ch>, "David S. Miller"
 <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Paolo Abeni
 <pabeni@redhat.com>, Rob Herring <robh@kernel.org>, Krzysztof Kozlowski
 <krzk+dt@kernel.org>, Conor Dooley <conor+dt@kernel.org>, Christian Marangi
 <ansuelsmth@gmail.com>, Benjamin Larsson <benjamin.larsson@genexis.eu>,
 linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org,
 netdev@vger.kernel.org, devicetree@vger.kernel.org, Xuegang Lu
 <xuegang.lu@airoha.com>
Subject: Re: [PATCH net-next v3 00/12] net: airoha: Support multiple
 net_devices connected to the same GDM port
Message-ID: <20260409195950.74e4bc97@kernel.org>
In-Reply-To: <20260406-airoha-eth-multi-serdes-v3-0-ab6ea49d59ff@kernel.org>
References: <20260406-airoha-eth-multi-serdes-v3-0-ab6ea49d59ff@kernel.org>
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On Mon, 06 Apr 2026 12:34:05 +0200 Lorenzo Bianconi wrote:
> EN7581 or AN7583 SoCs support connecting multiple external SerDes (e.g.
> Ethernet or USB SerDes) to GDM3 or GDM4 ports via a hw arbiter that
> manages the traffic in a TDM manner. As a result multiple net_devices can
> connect to the same GDM{3,4} port and there is a theoretical "1:n"
> relation between GDM ports and net_devices.

Looks like this driver uses page pool.
If you're sharing the same page pool across multiple netdevs
it must not be linked to a netdev.