Hi everyone, I just downloaded the latest OVS release (2.7.1) but unfortunately I am still able to reproduce the issue. It seems to be an OVS-specific issue since the reference count is reported correctly on other OF-DPA based hardware switches. Any thought?
Thanks, Charles On Mon, Jun 19, 2017 at 4:46 PM Charles Chan <[email protected]> wrote: > Hi everyone, > > I noticed a strange behavior of group reference count in ovs 2.7.0 and > therefore I am writing to confirm if this is expected. > > I created 2 indirect groups and 1 select group. There are 2 buckets in the > select group, each of them points to one of the indirect group. > sudo ovs-ofctl -O OpenFlow13 dump-groups ovs-br > OFPST_GROUP_DESC reply (OF1.3) (xid=0x2): > group_id=201,type=indirect,bucket=actions=output:1 > group_id=202,type=indirect,bucket=actions=output:2 > group_id=101,type=select, > *bucket=actions=group:201,bucket=actions=group:202* > > I also created a flow that points to the select group. > sudo ovs-ofctl -O OpenFlow13 dump-flows ovs-br > OFPST_FLOW reply (OF1.3) (xid=0x2): > cookie=0x0, duration=31.409s, table=0, n_packets=0, n_bytes=0, > vlan_tci=0x000a/0x1fff actions=group:101 > cookie=0x0, duration=275.500s, table=0, n_packets=0, n_bytes=0, > priority=0 actions=NORMAL > > However, the reference count of these 2 indirect groups are both zero. > sudo ovs-ofctl -O OpenFlow13 dump-group-stats ovs-br > OFPST_GROUP reply (OF1.3) (xid=0x2): > group_id=201,duration=185.249s,*ref_count=0* > ,packet_count=0,byte_count=0,bucket0:packet_count=0,byte_count=0 > group_id=202,duration=159.981s,*ref_count=0* > ,packet_count=0,byte_count=0,bucket0:packet_count=0,byte_count=0 > > > group_id=101,duration=111.349s,ref_count=1,packet_count=0,byte_count=0,bucket0:packet_count=0,byte_count=0,bucket1:packet_count=0,byte_count=0 > > I further looked up OF 1.3 spec and discovered this description in the > section of OFPMP_GROUP. > uint32_t ref_count; /* Number of *flows or groups that directly forward > to this group*. */ > According to my interpretation of the spec, the reference count of these > indirect groups should both be 1 instead of 0 since they are referenced by > the select group. > > This can be easily reproduced by following steps. > sudo ovs-vsctl add-br ovs-br > sudo ovs-ofctl -O OpenFlow13 add-group ovs-br > group_id=201,type=indirect,bucket=actions=output:1 > sudo ovs-ofctl -O OpenFlow13 add-group ovs-br > group_id=202,type=indirect,bucket=actions=output:2 > sudo ovs-ofctl -O OpenFlow13 add-group ovs-br > group_id=101,type=select,bucket=actions=group:201,bucket=actions=group:202 > sudo ovs-ofctl -O OpenFlow13 add-flow ovs-br vlan_vid=10,actions=group:101 > > I installed OVS from the 2.7.0 tarball. This is the version I am using. > sudo ovs-vsctl --version > ovs-vsctl (Open vSwitch) 2.7.0 > DB Schema 7.14.0 > > Thanks, > Charles > -- > > Charles Chan > Member of Technical Staff, ON.Lab > Member of Ambassador Steering Team, ONOS/CORD Community > -- Charles Chan Member of Technical Staff, ONF Member of Ambassador Steering Team, ONOS/CORD Community
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