netdev - RE: ixgbe and mac-vlans problem

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Date:	Fri, 30 Apr 2010 15:13:47 -0600
From:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
To:	Ben Greear <greearb@...delatech.com>, Arnd Bergmann <arnd@...db.de>
CC:	NetDev <netdev@...r.kernel.org>, Patrick McHardy <kaber@...sh.net>
Subject: RE: ixgbe and mac-vlans problem

Ben Greear wrote:
> On 04/30/2010 11:00 AM, Arnd Bergmann wrote:
>> On Friday 30 April 2010 00:27:39 Ben Greear wrote:
>>> Basically, we create 50 mac-vlans, with sequential MAC addresses
>>> and sequential IP addresses, and set up ip rules properly.
>>> 
>>> The issue is that only 10 or so of the mac-vlans receive other than
>>> broadcast packets.  The ixgbe NIC doesn't show PROMISC mode.
>> 
>> I just took a brief look at the driver and noticed that 82599 should
>> be able to handle 128 entries before going into promisc mode, while
>> 82598 (the same driver) does 16.
>> 
>> Maybe the logic for>16 entries is wrong, so you could try forcing
>> hw->mac.num_rar_entries to 16 for 82599 as well.
> 
> I think I was actually on an 825998 system when I saw it yesterday,
> but I have seen similar issues on 82599, though I didn't take time
> to debug it fully, so it could have been something else.
> 
> I will double-check the NIC chipset on the system that showed the
> problem yesterday.

I ran a quick test in my setup with 82599 and was able to pass traffic 
on all 50 mac-vlans without issues. This is on net-next.

Thanks,
Emil

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