netdev - Re: [PATCH 2/4] bgmac: write mac address to hardware in ndo_set_mac

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Message-ID: <5112740D.2000402@hauke-m.de>
Date:	Wed, 06 Feb 2013 16:17:33 +0100
From:	Hauke Mehrtens <hauke@...ke-m.de>
To:	Rafał Miłecki <zajec5@...il.com>
CC:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 2/4] bgmac: write mac address to hardware in ndo_set_mac_address

On 02/06/2013 03:57 PM, Rafał Miłecki wrote:
> 2013/2/6 Hauke Mehrtens <hauke@...ke-m.de>:
>> The generic implementation just changes the netdev struct and does not
>> write the new mac address to the hardware or issues some command to do
>> so.
> 
> That's because generic "eth_mac_addr" allows changing MAC only when
> interface is down. And we "upload" MAC address during bringing
> interface up. So there wasn't any bug, it was just working that way :)
> 
> One question: how you tested if changing MAC with keeping interface up
> works correctly? I just don't know if simple writes to
> BGMAC_MACADDR_HIGH and BGMAC_MACADDR_LOW are enough.
> 
> If it works for you (changing MAC without stopping interface), I'm OK with that.
> 
Yes that works in promisc and non promisc mode, I did this while pinging
the device and I had no package lose.

Hauke
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