From: Ben Greear <greearb@candelatech•com>
To: "Nicolas de Pesloüan" <nicolas.2p.debian@gmail•com>
Cc: "Michał Mirosław" <mirqus@gmail•com>,
"Jiri Pirko" <jpirko@redhat•com>,
"Stephen Hemminger" <shemminger@vyatta•com>,
netdev@vger•kernel.org, davem@davemloft•net, kaber@trash•net,
fubar@us•ibm.com, eric.dumazet@gmail•com, andy@greyhouse•net
Subject: Re: [RFC patch net-next-2.6] net: allow multiple rx_handler registration
Date: Fri, 01 Jul 2011 09:49:03 -0700 [thread overview]
Message-ID: <4E0DFA7F.20005@candelatech.com> (raw)
In-Reply-To: <4E0DF9C6.703@gmail.com>
On 07/01/2011 09:45 AM, Nicolas de Pesloüan wrote:
> Le 01/07/2011 17:01, Michał Mirosław a écrit :
>
>>>> We could introduce a catch-all macvlan/vlan device that would take
>>>> addresses/VLANs which are not covered by other configured
>>>> macvlans/vlans. This would allow clearer configuration and would make
>>>> the evaluation order explicit. As a bonus, this will give another
>>>> device to put tcpdump on. ;-)
>>>
>>> 'Sounds like what I had in mind in
>>> http://marc.info/?l=linux-netdev&m=130622112921245&w=2 .
>>
>> Almost. My idea assumes that eth0.any won't strip VLAN headers (so its
>> just looks like a filtered eth0).
>
> I originally thought unstripped packets should go to eth0.
>
> But, if eth0.any get untagged packets, we face two problems:
>
> 1/ We need a way to retrieve the original tag.
> 2/ We need a way to force the tag on output (or we consider eth0.any a
> pure tcpdump device, which is less useful).
>
> But if eth0.any get the exact same packets as those delivered to eth0,
> this seems useless.
>
> Or maybe, eth0.any should get only packets that weren't delivered to any
> eth0.XXXX devices... and should be named eth0.unmatched instead of
> eth0.any :-)
>
> Do we need eth0.untagged too (which would only get packets that were
> originally *not* tagged)?
>
> eth0 - Get everything, untouched. (I know several people except tagged
> packets to be untagged here, but I disagree with this part. eth0 is the
> raw device and should deliver raw packets, possibly retagging packets
> that were untagged by hw-accel).
> eth0.100 - Get VLAN 100 packet, untagged.
> eth0.untagged - Get only non-tagged packets, untouched.
> eth0.unmatched - Get only tagged packets, untouched.
Lets let the current vlan tagging changes settle a while before
adding yet more cruft in this area.
Packet filters should be able to filter on tags or not, so I don't
think these extra interfaces would be useful or needed. We may
need to fix up the sk-filter logic a bit to deal with the
stripped tags, however.
Thanks,
Ben
--
Ben Greear <greearb@candelatech•com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2011-07-01 16:49 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-30 15:16 [RFC patch net-next-2.6] net: allow multiple rx_handler registration Jiri Pirko
2011-06-30 16:27 ` Stephen Hemminger
2011-06-30 17:22 ` Jiri Pirko
2011-06-30 17:29 ` Ben Greear
2011-06-30 17:32 ` Jiri Pirko
2011-07-01 6:36 ` Michał Mirosław
2011-07-01 14:57 ` Nicolas de Pesloüan
2011-07-01 15:00 ` Jiri Pirko
2011-07-01 15:01 ` Michał Mirosław
2011-07-01 16:45 ` Nicolas de Pesloüan
2011-07-01 16:49 ` Ben Greear [this message]
2011-07-01 16:58 ` Nicolas de Pesloüan
2011-07-01 17:08 ` David Lamparter
2011-07-01 17:50 ` Michał Mirosław
2011-06-30 18:13 ` Ben Greear
2011-06-30 18:28 ` Jiri Pirko
2011-06-30 18:53 ` Ben Greear
2011-06-30 19:50 ` Nicolas de Pesloüan
2011-07-01 5:45 ` Jiri Pirko
2011-07-01 16:55 ` David Lamparter
2011-07-01 12:48 ` Jiri Pirko
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