netdev - RE: [net-next PATCH] net: allow vlan traffic to be received under bond

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Date:	Thu, 13 Oct 2011 20:23:22 +0200
From:	Hans Schillström <hans.schillstrom@...csson.com>
To:	John Fastabend <john.r.fastabend@...el.com>
CC:	Jiri Pirko <jpirko@...hat.com>, Maxime Bizon <mbizon@...ebox.fr>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"jesse@...ira.com" <jesse@...ira.com>,
	"fubar@...ibm.com" <fubar@...ibm.com>
Subject: RE: [net-next PATCH] net: allow vlan traffic to be received under
 bond


>On 10/13/2011 8:59 AM, Hans Schillström wrote:
>> Thu, Oct 13, 2011 at 05:04:34PM CEST, mbizon@...ebox.fr wrote:
>>>>
>>>> On Tue, 2011-10-11 at 00:37 +0200, Jiri Pirko wrote:
>>>>
>>>>> Hmm, I must look at this again tomorrow but I have strong feeling this
>>>>> will break some some scenario including vlan-bridge-macvlan.
>>>>
>>>> unless I'm mistaken, today's behaviour:
>>>>
>>>> # vconfig add eth0 100
>>>> # brctl addbr br0
>>>> # brctl addif br0 eth0
>>>>
>>>> => eth0.100 gets no more packets, br0.100 is to be used
>>>>
>>>> after the patch won't we get the opposite ?
>>>
>>> Looks like it. The question is what is the correct behaviour...
>>
>> I think this it become correct now, you should not destroy lover level if possible.
>> I.e. as John wrote "it's not an unexpected behaviour"
>>
>> Consider adding a bridge to a vlan like this
>>
>> vconfig add eth0 100
>> brctl addbr br1
>> brctl addif br1 eth0.100
>>
>> If you later add a bridge (or bond) should the previous added bridge still work ?
>> Yes I think so, for me it's the expected behaviour.
>>
>> brctl addbr br0
>> brctl addif br0 eth0
>>
>
>Sorry I'm not entirely sure I followed the above two posts. Note
>this patch restores behavior that has existed for most of the
>2.6.x kernels. In the 3.x kernels VLAN100 is dropped in the
>schematic below (assuming eth0 is active), I think this is
>incorrect.
>
>      ---> eth0.100
>       |
>       |
>eth0 -----> br0
>
>With this patch VLAN100 is delivered to eth0.100 as I expect. Now
>adding a VLAN100 to br0.
>
>
>       ---> eth0.100
>       |
>       |
>eth0 -----> br0---> br0.100
>
>With this patch in the above case VLAN100 is delivered to the
>first matching vlan. Here eth0.100 will receive the packet If
>you really want br0.100 to receive the packet remove eth0.100.
>Without this patch the packet will be delivered to br0.100,
>but no configuration will allow a packet to be delivered to
>eth0.100 with a bond.
>
>The first schematic is used for doing bonding on LAN traffic
>and SAN (storage) traffic with MPIO. So I think my expectations
>are correct and have a real use case.
>
>Thanks,
>John

Sorry if I caused confusion,  I do agree with you to 100%.

Regards
Hans


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