From: <[email protected]> on behalf of Advith Nagappa
<[email protected]>
Date: Wednesday, March 29, 2017 at 9:39 PM
To: discuss <[email protected]>
Subject: [ovs-discuss] SR-IOV with Open vSwitch
Hello All,
Has anyone used SR-IOV with Open vSwitch(in a guest)?
My understanding is that SR-IOV is hypervisor(host) by/pass, Hence using OVS at
that level would not make sense..
So I tried deploying OVS in an SR-IOV enabled guest, and here is what I
observed..
I have one virtual function within my guest, called ens7.
I have added that to by OVS-bridge..
d5f266fc-a6f1-448e-91c5-e6db8748f73f
Bridge "br0"
Port "ens7"
Interface "ens7"
Port "br0"
Interface "br0"
type: internal
I also, added the following rule:
ovs-ofctl add-flow br0
priority=1111,dl_type=0x0800,nw_proto=17,nw_src=10.0.0.1,nw_dst=10.0.0.2,actions=
However every time I send a UDP datagram, I see that this rule is hit!, but the
packet is not dropped:
cookie=0x0, duration=123.175s, table=0, n_packets=14, n_bytes=60, idle_age=2,
priority=1111,udp,nw_src=10.0.0.1,nw_dst=10.0.0.2 actions=drop
The thing here is 10.0.0.1 and 10.0.0.2 share a physical function,.. and,
despite the rule hit, the datagram is forwarded, I wonder what may be causing
this? I am guessing some kind of L2 switching at the NIC level, which overrides
OVS? Does anyone have an experience with this..
You are running OVS in the VM(s), not the host.
I assume you are sending packets in one direction only and are constantly
hitting an L2 broadcast case in the Linux bridge in the host
(this is also an assumption, since you don’t delineate all your config. and
topology).
So, I guess one copy of the packet is bypassing OVS in the VM and another copy
is sent to OVS in the VM to be dropped.
Below link has more information and child links from there.
https://github.com/intel/SDN-NFV-Hands-on-Samples/blob/master/SR-IOV_DPDK_Hands-on_Lab/docs/SR-IOV-HandsOn-IEEE.pdf
Best Regards
Advith Nagappa
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