On Tue, Mar 06, 2018 at 11:20:40AM -0800, Ben Pfaff wrote:
> On Tue, Mar 06, 2018 at 06:54:30AM +0000, Josh Bailey via discuss wrote:
> > Hoping I'm missing something obvious!
> > 
> > I have a flow like this:
> > 
> > $ grep CONTROLLER sab-dump-flows.log
> >  cookie=0x5adc15c0, duration=63.446s, table=3, n_packets=60, n_bytes=3436,
> > priority=0 actions=CONTROLLER:96
> > 
> > I can cause packets to match it, but no packets are output ot the
> > controller.
> > 
> > faucet@faucet:/var/tmp/faucet-tests-1KL3eg/FaucetUntaggedTestZeroPriorityFlowsTest-test_untagged$
> > tshark -l -n -Q -d tcp.port==40649,openflow -O openflow_v4 -Y
> > "openflow_v4.packet_in.total_len>0" -r fa*cap|wc -l
> > 0
> > 
> > If I specify any priority other than 0, it works (packets are output to
> > controller via packet in messages).
> > 
> > Is there something special about priority=0 flows and the CONTROLLER action?
> 
> Yes, in fact OpenFlow specifies special cases for priority=0 flows that
> match no fields.  It calls these "table-miss" flows, see e.g. section
> 5.4 in OpenFlow 1.5.1.  Open vSwitch has some explicit special-case code
> for dealing with them.
> 
> I can't think of a particular reason why this special case would make a
> difference for you.  Maybe there is a bug.  Do you have a way for us to
> reproduce it?
> 
> Did you try "ofproto/trace"?  Maybe it will show a reason why the packet
> is not sent to the controller.
> 
> (I'm at a conference this week, so my schedule is weird.)

I wonder whether you figured out anything here and whether you have any
more of a bug report for us.  Happy to help, if so.
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