netdev - Re: ping test with DSA ports failing

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Message-ID: <08c97a2e-9060-4fac-9471-520f1401f300@lunn.ch>
Date: Thu, 25 Apr 2024 23:13:05 +0200
From: Andrew Lunn <andrew@...n.ch>
To: SIMON BABY <simonkbaby@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: ping test with DSA ports failing

On Thu, Apr 25, 2024 at 01:47:37PM -0700, SIMON BABY wrote:
> Yes, I used cat6 cable to connect RGMII ports between CPU and Marvel PHY. 
> 
> So if there is a physical cable between the PHYs, can the MAC talk to the PC ?
> Can this be the issue ?

Physical cable should not be a problem, so long as it is less than
100m long. Its just Ethernet, nothing special.

> Currently both sides have PHYs. In our actual board, on the SoC side there will
> not be any PHY and it will be wired with a high speed RGMII connector between
> MAC and Marvel PHY. 

That is how most systems work. But back to back PHYs is also
supported. However, you probably need different RGMII delays for each
configuration.

	Andrew