netdev - Re: [PATCH net-next v2] openvswitch: enable NSH support

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Message-ID: <20170811122256.2cec123e@griffin>
Date:   Fri, 11 Aug 2017 12:22:56 +0200
From:   Jiri Benc <jbenc@...hat.com>
To:     Jan Scheurich <jan.scheurich@...csson.com>
Cc:     "Yang, Yi Y" <yi.y.yang@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "dev@...nvswitch.org" <dev@...nvswitch.org>
Subject: Re: [PATCH net-next v2] openvswitch: enable NSH support

On Fri, 11 Aug 2017 10:09:36 +0000, Jan Scheurich wrote:
> Unless someone can explain to me why the datapath should understand the
> internal structure/format of metadata in push_nsh, I would strongly
> vote to keep the metadata as variable length octet sequence in the
> non-structured OVS_ACTION_ATTR_PUSH_NSH

Could be but it still needs to be in a different attribute and not in
the ovs_action_push_nsh structure.

Separate attributes for MD1/MD2 has the advantage of easier validation:
with a separate MD1 type attribute, the size check is easier. With an
unstructured MD attribute, we'd need to look into the
OVS_ACTION_ATTR_NSH_BASE_HEADER attribute for mdtype and then validate
the unstructured MD attribute size manually. Not a big deal, though.
I don't have strong opinion here.

But I do have strong opinion that MD needs to go into a separate
attribute, whether there are separate attributes for MD1/2 or not.

 Jiri