netdev - Re: [PATCH v2.58] datapath: Add basic MPLS support to kernel

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Message-ID: <CAEP_g=8Ub64M29TQx82KrFMLcdsAPfKmC8w92d-Ofr9cVhNKFQ@mail.gmail.com>
Date:	Mon, 2 Jun 2014 17:58:10 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	"dev@...nvswitch.org" <dev@...nvswitch.org>,
	netdev <netdev@...r.kernel.org>, Ravi K <rkerur@...il.com>,
	Joe Stringer <joe@...d.net.nz>, Thomas Graf <tgraf@...g.ch>
Subject: Re: [PATCH v2.58] datapath: Add basic MPLS support to kernel

On Sun, May 25, 2014 at 5:22 PM, Simon Horman <horms@...ge.net.au> wrote:
> diff --git a/datapath/flow_netlink.c b/datapath/flow_netlink.c
> index 803a94c..8ce596c 100644
> --- a/datapath/flow_netlink.c
> +++ b/datapath/flow_netlink.c
> +               case OVS_ACTION_ATTR_POP_MPLS:
> +                       if (!eth_p_mpls(eth_type))
> +                               return -EINVAL;

Should this also take into account the VLAN tag? It's really part of
the EtherType although it has been stripped out here. Actually, maybe
it's better to not track the vlan_tci separately at all during
validation but just fold it into the EtherType.

The practical implication of this is that you wouldn't be able to pop
out from underneath a VLAN. This may be a good thing if we are trying
to avoid tag order issues - after all, you can't push underneath a
VLAN either. I'm not sure what effects this has on the need to track
mac_len, if any.

Otherwise, I'm happy with this. I think that we need to conclude the
discussion on the other patch and update this appropriately first.
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