On Wed, Dec 06, 2017 at 05:58:41AM +0000, Amar Padmanabhan wrote:
> We are debugging a setup and are seeing something that we are finding it hard
> to explain.
>
> 1 - Here is the ovs-dpctl dump-flows output.
> recirc_id(0),in_port(3),eth_type(0x0800),ipv4(dst=192.168.128.0/255.255.255.0,frag=no),
> packets:550, bytes:53900, used:0.364s,
> actions:userspace(pid=3276048382,slow_path(controller))
OK, the above datapath flow just says that packets in this flow have to
be handled in the userspace slow path because
> 2 - We are now trying to trace this flow and are not seeing the output to
> controller flow getting hit in the trace.
> sudo ovs-appctl ofproto/trace
> "in_port(3),eth_type(0x0800),ipv4(dst=192.168.128.0/255.255.255.0,frag=no)"
> Flow:
> packet_type=(1,0x800),in_port=32770,nw_src=0.0.0.0,nw_dst=192.168.128.0,nw_proto=0,nw_tos=0,nw_ecn=0,nw_ttl=0
> bridge("gtp_br0")
> -----------------
> 0. priority 0 resubmit(,1)
> 1. in_port=32770, priority 10 set_field:0->metadata resubmit(,2)
> 2. priority 0 resubmit(,3)
> 3. No match. drop Final flow: unchanged Megaflow:
> recirc_id=0,packet_type=(1,0x800),in_port=32770,nw_frag=no Datapath actions:
> drop ---> Why isn’t the output to controller flow getting hit?
>
>
> 3 - We are also seeing the flow counts go up for the output to controller
> flow per the ofctl dump-flows output (pasting relevant flows)
>
> NXST_FLOW reply (xid=0x4): cookie=0x0, duration=1482.245s, table=0,
> n_packets=1408, n_bytes=148464, idle_age=1, priority=0 actions=resubmit(,1)
> cookie=0x0, duration=1482.244s, table=1, n_packets=1283, n_bytes=123662,
> idle_age=1, priority=10,in_port=32770
> actions=set_field:0->metadata,resubmit(,2)
> cookie=0x0, duration=1482.244s, table=2, n_packets=1247, n_bytes=122150,
> idle_age=1, priority=0 actions=resubmit(,3)
> cookie=0x0, duration=1482.245s, table=3, n_packets=1245, n_bytes=122010,
> idle_age=1, priority=0,ip,metadata=0,nw_dst=192.168.128.0/24
> actions=CONTROLLER:65535 ---> Notice that this is getting hit as well
OK, I spent a few minutes to mock up your environment (thanks for all
the details!) and experiment. It looks like the problem is actually a
mismatch between the formatting and parsing code for datapath flows. If
I run:
ovs-appctl ofproto/trace
"in_port(3),eth(),eth_type(0x0800),ipv4(dst=192.168.128.0/255.255.255.0,frag=no)"
that is, add "eth()" to the datapath flow, then I get the expected
results:
$ ovs-appctl ofproto/trace
"in_port(1),eth(),eth_type(0x0800),ipv4(dst=192.168.128.0/255.255.255.0,frag=no)"
Flow:
ip,in_port=32770,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,nw_src=0.0.0.0,nw_dst=192.168.128.0,nw_proto=0,nw_tos=0,nw_ecn=0,nw_ttl=0
bridge("br0")
-------------
0. priority 0
resubmit(,1)
1. in_port=32770, priority 10
load:0->OXM_OF_METADATA[]
resubmit(,2)
2. priority 0
resubmit(,3)
3. ip,metadata=0,nw_dst=192.168.128.0/24, priority 0
CONTROLLER:65535
Final flow: unchanged
Megaflow:
recirc_id=0,eth,ip,in_port=32770,nw_dst=192.168.128.0/24,nw_frag=no
Datapath actions: drop
This flow is handled by the userspace slow path because it:
- Sends "packet-in" messages to the OpenFlow controller.
Clearly that's a bug. I'll see what I can do about it.
> Also, Whoever improved the output of ofproto/trace thanks a ton!
That was me :-) You're welcome.
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