netdev - Re: [PATCH net-next v2 1/7] net: pcs: xpcs: add specific vendor supoprt for Wangxun 10Gb NICs

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Message-ID: <317b1df4-0a95-40fb-9a1b-16f28ba1fcb7@lunn.ch>
Date: Wed, 9 Aug 2023 15:07:38 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: "'Russell King (Oracle)'" <linux@...linux.org.uk>,
	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, hkallweit1@...il.com,
	Jose.Abreu@...opsys.com, mengyuanlou@...-swift.com
Subject: Re: [PATCH net-next v2 1/7] net: pcs: xpcs: add specific vendor
 supoprt for Wangxun 10Gb NICs

> Yes, net-swift's OUI is 30:09:F9.
> 
> But if we want to read OUI from PCS to identify the vendor, we need the
> next version of firmware to do this. How can this be compatible with the
> old firmware version?
 
In general, the driver should offer only the features the firmware
supports.

So if you find a PCS with the old OUI, don't offer the link modes
which require the PCS configured in special ways. You can also issue a
warning that the firmware should be upgraded.

	Andrew