[ovs-dev] How can we determaine if the match field can be "writable"?

Ben Pfaff blp at nicira.com
Fri Jun 7 14:56:39 UTC 2013

On Fri, Jun 07, 2013 at 01:51:26AM -0700, Brian Shang wrote:
> I want to add a match field to ovs, but I'm not sure whether it should be
> modified by "set_field" action. From openflow spec 1.3, it says "set_field"
> action can modify any valid OXM header field, but I find some fields are
> set false(eg. "ipv6_label"). I want to know how can we determaine it, from
> openflow spec or from need of programing?

If you implement the ability to modify the field, then mark it as
writable.  If you don't, mark it as unwritable.

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