linux-kernel - RE: [PATCH] r8152: Add support for setting MAC to system's Auxiliary MAC address

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Message-ID: <0835B3720019904CB8F7AA43166CEEB2FED973@RTITMBSV03.realtek.com.tw>
Date:	Fri, 3 Jun 2016 09:23:29 +0000
From:	Hayes Wang <hayeswang@...ltek.com>
To:	"Mario_Limonciello@...l.com" <Mario_Limonciello@...l.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"pali.rohar@...il.com" <pali.rohar@...il.com>,
	"anthony.wong@...onical.com" <anthony.wong@...onical.com>
Subject: RE: [PATCH] r8152: Add support for setting MAC to system's Auxiliary MAC address

Mario_Limonciello@...l.com [mailto:Mario_Limonciello@...l.com]
> Sent: Friday, June 03, 2016 12:58 AM
[...]
> > Why generate a random one and not just use the one that the network
> > controler already provides?
> 
> That's how the flow works in r8152 already and I'm not overriding it.
> Again, I'll send V2 and you'll see what I did.

The original flows are
1. Read MAC address 1 from device.
2. Check if the MAC address 1 is valid.
3. Use random MAC address if MAC address 1 is invalid.

However, your flow would be
1. Read MAC address 1 from device.
2. Read MAC address 2 from ACPI.
3. Check if the MAC address 2 is valid.
4. Use random MAC address if MAC address 2 is invalid.

Although MAC address 2 may be invalid, MAC address 1 may be valid.
For this situation, you have to use MAC address 1, not random one.

Best Regards,
Hayes