netdev - RE: [PATCH v3 net-next 5/6] net: enetc: add basic support for the ENETC with pseudo MAC for i.MX94

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Message-ID:
 <AM7PR04MB71421B44BFAD7BA1C96A60EB96FCA@AM7PR04MB7142.eurprd04.prod.outlook.com>
Date: Mon, 27 Oct 2025 08:26:55 +0000
From: Claudiu Manoil <claudiu.manoil@....com>
To: Wei Fang <wei.fang@....com>, "robh@...nel.org" <robh@...nel.org>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, Vladimir Oltean <vladimir.oltean@....com>, Clark Wang
	<xiaoning.wang@....com>, Frank Li <frank.li@....com>, "andrew+netdev@...n.ch"
	<andrew+netdev@...n.ch>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"richardcochran@...il.com" <richardcochran@...il.com>
CC: "imx@...ts.linux.dev" <imx@...ts.linux.dev>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>
Subject: RE: [PATCH v3 net-next 5/6] net: enetc: add basic support for the
 ENETC with pseudo MAC for i.MX94

> -----Original Message-----
> From: Wei Fang <wei.fang@....com>
> Sent: Monday, October 27, 2025 3:45 AM
[...]
> Subject: [PATCH v3 net-next 5/6] net: enetc: add basic support for the ENETC
> with pseudo MAC for i.MX94
> 
> The ENETC with pseudo MAC is an internal port which connects to the CPU
> port of the switch. The switch CPU/host ENETC is fully integrated with
> the switch and does not require a back-to-back MAC, instead a light
> weight "pseudo MAC" provides the delineation between switch and ENETC.
> This translates to lower power (less logic and memory) and lower delay
> (as there is no serialization delay across this link).
> 
> Different from the standalone ENETC which is used as the external port,
> the internal ENETC has a different PCIe device ID, and it does not have
> Ethernet MAC port registers, instead, it has a small number of pseudo
> MAC port registers, so some features are not supported by pseudo MAC,
> such as loopback, half duplex, one-step timestamping and so on.
> 
> Therefore, the configuration of this internal ENETC is also somewhat
> different from that of the standalone ENETC. So add the basic support
> for ENETC with pseudo MAC. More supports will be added in the future.
> 
> Signed-off-by: Wei Fang <wei.fang@....com>

Reviewed-by: Claudiu Manoil <claudiu.manoil@....com>