[pox-dev] how to specify wildcards in ofp_match.from_packet()?

[William Emmanuel Yu]

Hello all,

I am trying to optimize the flows created in the of_tutorial example.
Here is some code for a learning switch.

      port = self.mac_to_port[str(packet.dst)]
      msg = of.ofp_flow_mod()
      msg.match = of.ofp_match.from_packet(packet)
      msg.idle_timeout = 10
      msg.hard_timeout = 30
      msg.actions.append(of.ofp_action_output(port = port))
      msg.buffer_id = packet_in.buffer_id
      self.connection.send(msg)

I want to be able to do something like this.

      msg.match = of.ofp_match.from_packet(packet, 
        wildcards = OFPFW_DL_DST)

The wildcard OFPFW_DL_DST only matches the destination ethernet address.
This way the flow is more generic so any packet to that particular
destination ethernet address in the switch does not generate a PacketIn.

Currently, the ofp_match.from_packet() function does not accept
wildcards. As a matter of fact, I can't seem to find the appropriate
function that allows us to define wildcards. Additionally, wildcards
such as OFPFW_DL_DST or OFPFW_ALL are not global and accessible in my
code.

I not sure if this is the best way to do this but I bumped into the idea
while looking at the OF 1.0 specification. Any suggestions?

-- 
-------------------------------------------------------
William Emmanuel S. Yu, Ph.D. (杨怀义)
Department of Information Systems and Computer Science
Ateneo de Manila University
email  :  wyu at ateneo dot edu
blog   :  http://hip2b2.yutivo.org/
web    :  http://CNG.ateneo.edu/cng/wyu/
phone  :  +63(2)4266001 loc. 4186
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