On 4/24/2014 1:47 PM, Jesse Gross wrote:
On Thu, Apr 24, 2014 at 8:38 AM, Thomas F Herbert
<thomasfherb...@gmail.com> wrote:
Hi,
I think there is a problem with parsing out the OVS ATTRIBUTE nesting in the
NL message in the datapath and I am having trouble finding the cause. I
think the nl msg is built up wrong in the case of the vlan push action.
I first saw the problem while testing my patch for 802.1ad. However, I also
see the same problem WITHOUT the patch on commits in the master branch.
The message appears in the kern log for commit dcbe78 and subsequent commits
on the master branch. The message does NOT appear in the 2.1 release branch.
Apr 23 07:50:11 lubuntu-12 kernel: [ 1009.493608] openvswitch: netlink: Key
attribute has unexpected length (type=62, length=4, expected=0).
Message is from line 300 in datapath/flow_netlink.c
It is interesting that type 62 is the maximum key attribute value.
The problem can be also reproduced with the following command with commit
f487a:
ovs-ofctl -vdbg --protocols=OpenFlow11 add-flow br0
in_port=1,actions=push_vlan:0x8100,load:0x64-\>OXM_OF_VLAN_VID[],output:2
This attribute is for MPLS, which userspace supports but the kernel
doesn't. This shouldn't be generated in any case but is there any MPLS
traffic here?
There is no traffic at all when the message appears.
You could try bisecting since you have points in the code where it is
working and not. It might also be worth setting the log level to debug
to watch the upcalls and flow installations.
OK, Jesse, I will debug by bisecting the commit history to see where it
first appeared and get back to you when I find it.
There is no traffic yet and it occurs before any flows are pushed. The
message appears when the bridge is initially set up with the following
command.
ovs-vsctl add-br br0
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