netdev - RE: [PATCH net] net: dsa: mv88e6060: fix switch MAC address

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Date:   Fri, 13 Oct 2017 19:09:22 +0000
From:   <Woojung.Huh@...rochip.com>
To:     <vivien.didelot@...oirfairelinux.com>, <netdev@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <kernel@...oirfairelinux.com>,
        <davem@...emloft.net>, <f.fainelli@...il.com>, <andrew@...n.ch>,
        <David.Laight@...LAB.COM>
Subject: RE: [PATCH net] net: dsa: mv88e6060: fix switch MAC address

> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-
> owner@...r.kernel.org] On Behalf Of Vivien Didelot
> Sent: Friday, October 13, 2017 1:39 PM
> To: netdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org; kernel@...oirfairelinux.com; David S.
> Miller; Florian Fainelli; Andrew Lunn; David Laight; Vivien Didelot
> Subject: [PATCH net] net: dsa: mv88e6060: fix switch MAC address
> 
> The 88E6060 Ethernet switch always transmits the multicast bit of the
> switch MAC address as a zero. It re-uses the corresponding bit 8 of the
> register "Switch MAC Address Register Bytes 0 & 1" for "DiffAddr".
> 
> If the "DiffAddr" bit is 0, then all ports transmit the same source
> address. If it is set to 1, then bit 2:0 are used for the port number.
> 
> The mv88e6060 driver is currently wrongly shifting the MAC address byte
> 0 by 9. To fix this, shift it by 8 as usual and clear its bit 0.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> ---

Reviewed-by: Woojung Huh <woojung.huh@...rochip.com>

- Woojung