linux-kernel - Re: [PATCH net 3/3] net: lan743x: Address problems with wake option flags configuration sequences

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Message-ID: <fd22d022-cad4-489c-9861-36765dd98a87@lunn.ch>
Date: Tue, 12 Mar 2024 22:40:39 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Ronnie.Kunin@...rochip.com
Cc: Raju.Lakkaraju@...rochip.com, netdev@...r.kernel.org,
	davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org,
	Bryan.Whitehead@...rochip.com, richardcochran@...il.com,
	UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net 3/3] net: lan743x: Address problems with wake option
 flags configuration sequences

> I understand that the TI devices give the *impression* of supporting
> both, but based on what I explained above, even if you accept
> WAKE_MAGIC and WAKE_MAGICSEGURE on a set and report them both back
> as enabled on a get; whatever behavior your hardware does will not
> be fully compliant to both specs simultaneously anyway. I discussed
> this with Raju and what we decided to do for our driver/device is
> that if you pass both WAKE_MAGIC and WAKE_MAGICSEGURE flags to us we
> will report them back as both being enabled in a subsequent get as
> you suggested, but the behavior of our driver/hardware will be as if
> you had only enabled WAKE_MAGIC.

So i agree having WAKE_MAGIC and WAKE_MAGICSECURE at the same time
seems very odd. So i see no real problem limiting the driver to only
one or the other. However, if the user does ask for both, i would say
silently ignoring one is incorrect. You should return -EOPNOTUPP to
make it clear you don't support both at the same time.

I would also say that silently ignore the Secure version is probably
the worst choice. Things should be secure by default...

     Andrew