netdev - Re: [PATCH v2 net-next 0/4] bridge: 802.1ad vlan protocol support

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Date:	Wed, 11 Jun 2014 15:23:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	makita.toshiaki@....ntt.co.jp
Cc:	stephen@...workplumber.org, vyasevic@...hat.com,
	netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH v2 net-next 0/4] bridge: 802.1ad vlan protocol support

From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Date: Tue, 10 Jun 2014 20:59:21 +0900

> Currently bridge vlan filtering doesn't work fine with 802.1ad protocol.
> Only if a bridge is configured without pvid, the bridge receives only
> 802.1ad tagged frames and no STP is used, it will work.
> Otherwise:
> - If pvid is configured, it can put only 802.1Q tags but cannot put 802.1ad
>   tags.
> - If 802.1Q and 802.1ad tagged frames arrive in mixture, it applies filtering
>   regardless of their protocols.
> - While an 802.1ad bridge should use another mac address for STP BPDU and
>   should forward customer's BPDU frames, it can't.
> Thus, we can't properly handle frames once 802.1ad is used.
> 
> Handling 802.1ad is useful if we want to allow stacked vlans to be used,
> e.g., guest VMs wants to use vlan tags and the host also wants to segregate
> guest's traffic from other guests' by vlan tags.
> 
> Here is the image describing how to configure a bridge to filter VMs traffic.
> 
>          +-------+p/u   +-----+  +---------+
>  +----+  |       |------|vnet0|--|User A VM|
>  |eth0|--|802.1ad|      +-----+  +---------+
>  +----+  |bridge |p/u   +-----+  +---------+
>          |       |------|vnet1|--|User B VM|
>          +-------+      +-----+  +---------+
> p/u: pvid/untagged
> 
> This patch set enables us to set vlan protocols per bridge.
> This tries to implement a bridge like S-VLAN component in IEEE 802.1Q-2011
> spec.

Series applied, thanks.
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