netdev - Re: [PATCH net-next 1/3] net: stmmac: clear half-duplex caps where unsupported

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Message-ID: <ee26c05c-a7dd-4334-b359-353449e50662@bootlin.com>
Date: Fri, 30 Jan 2026 20:18:44 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, linux-arm-kernel@...ts.infradead.org,
 linux-stm32@...md-mailman.stormreply.com, netdev@...r.kernel.org,
 Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next 1/3] net: stmmac: clear half-duplex caps where
 unsupported

On 30/01/2026 19:09, Russell King (Oracle) wrote:

> If you look at /sys/kernel/debug/stmmaceth/ethX/dma_cap, it should
> say whether half duplex is supported (I guess in your case it will
> be, it's probably very unlikely not to be.) However, would be worth
> knowing whether the if() is taken or not!
> 

Just rebuilt a kernel w/ debugfs support, and indeed I have :
[...]
	10/100 Mbps: Y
	1000 Mbps: Y
	Half duplex: Y
[...]

So looks like the if() isn't taken :)

Maxime