netdev - Re: [PATCH net-next v2 0/9] Add support for OPEN Alliance 10BASE-T1x MACPHY Serial Interface

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Message-ID: <b1e87ca5-f126-4381-a530-75217894cc4a@lunn.ch>
Date: Mon, 25 Mar 2024 15:01:35 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Parthiban.Veerasooran@...rochip.com
Cc: benjamin@...ler.one, netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Horatiu.Vultur@...rochip.com, Woojung.Huh@...rochip.com,
	Nicolas.Ferre@...rochip.com, UNGLinuxDriver@...rochip.com,
	Thorsten.Kummermehr@...rochip.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, corbet@....net, Steen.Hegelund@...rochip.com,
	rdunlap@...radead.org, horms@...nel.org, casper.casan@...il.com
Subject: Re: [PATCH net-next v2 0/9] Add support for OPEN Alliance 10BASE-T1x
 MACPHY Serial Interface

> It looks like the IRQ is asserted on RESET completion and expects a data
> chunk from host to deassert the IRQ. I used to test the driver in RPI 4
> using iperf3. For some reason I never faced this issue, may be when the
> network device is being registered there might be some packet 
> transmission which leads to deliver a data chunk so that the IRQ is
> deasserted.

If you have IPv6 enabled, the network stack will try to add a link
local IPv6 address to the interface, which means performing a
Duplicate Address Detection. That means sending a few packets.

Try disabling IPv6 if you want to reproduce the problem.

	  Andrew