[ovs-discuss] Parallel VxLAN tunnels

[Jean Tourrilhes]

Hi,

I want to know how to implement parallel VxLAN tunnels between
two hosts with OVS.
Each host, h0 and h1, has two OVS instances, br0 and
br1. I want two separate VxLAN tunnels :
h0-br0 <=> h1-br0
h0-br1 <=> h1-br1
Those two tunnels could be using different VNI, so is there
a way for a OVS instance to use only a single VNI ? I also saw that
VxLAN support alternate port number, should I use that ?
Thanks in advance !

Jean
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[ovs-discuss] Q: Using netfilter to classify packets in OVS ?

[Jean Tourrilhes]

Hi,

I want to classify/match packets in OVS based on some TCP
options, this is currently not supported by OVS but it is supported by
netfilter. The support for ConnTrack left me wondering if I could use
netfilter to match that field and then use the result of that in OVS.
Thanks in advance...

Jean
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[ovs-discuss] Issue with offloading OVS flows into Mellanox-4 cards

[Sugu Chandran]

Hi,

I am trying to test hardware offloading feature in OVS using a 2*25G
mellanox NIC.   My test setup has static OVS L2 rules to forward packets
between these two ports. The traffic generators are connected to these
ports to pump in traffic.
The hardware offloading is enabled in the system by using,
ovs-vsctl --no-wait set Open_vSwitch . other_config:hw-offload=true
I didnt set any hw-policy explicit,  as I kept it default as 'None'

I noticed that when I am sending traffic to these ports, there are no rules
that are getting programmed into the hardware. Also there are no error
reported in ovs-vswitchd.log as such.
Of Course the packets are getting forwarded in software.  Is there anything
else needs to be done to make the TC for programming the mellanox NICs?

Regards
_Sugu
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Re: [ovs-discuss] Question regarding group reference count

[Ben Pfaff]

It's probably a bug in OVS.  The group reference count is, from an OVS
perspective, a bookkeeping exercise without real value, so it can easily
get out of sync.

On Thu, Jul 06, 2017 at 09:37:49PM +, Charles Chan wrote:
> 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  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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[ovs-discuss] Issue with offloading OVS flows into MLNX-4 cards

[Sugu Chandran]

Hi,

I am trying to test hardware offloading feature in OVS using a 2*25G
mellanox NIC.   My test setup has static OVS L2 rules to forward packets
between these two ports. The traffic generators are connected to these
ports to pump in traffic.
The hardware offloading is enabled in the system by using,
ovs-vsctl --no-wait set Open_vSwitch . other_config:hw-offload=true
I didnt set any explicit hw-policy ,  kept it default as 'None'

I noticed that when I am sending traffic to these ports, there are no rules
getting programmed into the hardware. Also there are no error reported in
ovs-vswitchd.log as such.
Of Course the packets are getting forwarded in software.  Is there anything
else needs to be done to make the TC to program the mellanox NICs?

Regards
_Sugu
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