netdev - RE: ixgbe and mac-vlans problem

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Message-ID: <EA929A9653AAE14F841771FB1DE5A1365FE5560B00@rrsmsx501.amr.corp.intel.com>
Date:	Fri, 30 Apr 2010 16:26:44 -0600
From:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
To:	Ben Greear <greearb@...delatech.com>
CC:	Arnd Bergmann <arnd@...db.de>, NetDev <netdev@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: RE: ixgbe and mac-vlans problem

Ben Greear wrote:
> On 04/30/2010 02:13 PM, Tantilov, Emil S wrote:
>> 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.
> 
> For an 82599 system, I can get 127 mac-vlans working out of 500
> created. 
> 
> That NIC also does not go PROMISC with lots (500) of mac-vlans.
> 
> Once I put it in promisc mode manually, it works fine.
> 
> So, I think whatever logic is supposed to put the NIC into promisc
> mode when it overflows it's lookup tables isn't working for ixgbe
> in 2.6.31.12.

Yeah, you're right. I was able to repro it. 

We'll look into it.

Thanks,
Emil--
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