netdev - Re: [PATCH net] net: Disallow providing non zero VLAN ID for NIC drivers FDB add flow

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Date:	Mon, 15 Dec 2014 10:31:35 -0500
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Jiri Pirko <jiri@...nulli.us>, Or Gerlitz <gerlitz.or@...il.com>
CC:	Or Gerlitz <ogerlitz@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	John Fastabend <john.r.fastabend@...el.com>
Subject: Re: [PATCH net] net: Disallow providing non zero VLAN ID for NIC
 drivers FDB add flow

On 12/14/14 17:33, Jiri Pirko wrote:
> Sun, Dec 14, 2014 at 09:14:27PM CET, gerlitz.or@...il.com wrote:
>> On Sun, Dec 14, 2014 at 9:23 PM, Jiri Pirko <jiri@...nulli.us> wrote:
>>> Sun, Dec 14, 2014 at 05:19:05PM CET, ogerlitz@...lanox.com wrote:
>>>> The current implementations all use dev_uc_add_excl() and such whose API
>>>> doesn't support vlans, so we can't make it with NICs HW for now.
>>>>
>>>> Fixes: f6f6424ba773 ('net: make vid as a parameter for ndo_fdb_add/ndo_fdb_del')
>>>
>>> Maybe I'm missing something, but this commit did not introduce the
>>> problem.
>>
>> This commit introduced the vid param to ndo_fdb_add and ndo_dflt_fdb_add
>> which further call the dev_uc_add APIs... so it did introduced the
>> ability to provide VID into these APIs, right? and we want to protect
>> against anyone using this ability @ this point.
>
> That is in-kernel change. Vs. usespace the patch is a no-op. If userspace
> fills up NDA_VLAN, it is ignored before the patch as well as after. No
> behaviour change, just +- cosmetics.
>

Indeed doesnt break anything, but:
I think this brings to the forefront what these dev_uc/mc addresses
are supposed to be here. I am sure there is a good reason to tie them
to the fdb API - I am just not grokking it at the moment.
The concept of a vlanid makes sense for an fdb entry. It
starts to break when you start tying in vlans - i.e i am not aware
of multicast/unicast device entries which are tied to vlans.
Maybe this is some SRIOV thing?

cheers,
jamal

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