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I'm probably the wrong person to give advice on kernel development,
since I haven't been involved in it for years.  I just know that it's
difficult, and not always because of the code.

It's hard to support a protocol in OVS before it's supported in the
kernel, since userspace without a kernel implementation is not very
useful.

On Wed, Jun 01, 2016 at 09:59:12PM +0000, Elzur, Uri wrote:
> Hi Ben
> 
> Any guidance you can offer will be appreciated. The process has taken long time and precious cycles. How can we get to a coordinated Kernel and OvS approach to avoid the challenges and potentially misaligned advise we got (per Yi Yang's mail)?
> 
> Thx
> 
> Uri ("Oo-Ree")
> C: 949-378-7568
> 
> 
> -----Original Message-----
> From: Ben Pfaff [mailto:blp at ovn.org] 
> Sent: Tuesday, May 31, 2016 9:48 PM
> To: OpenStack Development Mailing List (not for usage questions) <openstack-dev at lists.openstack.org>
> Subject: Re: [openstack-dev] [Neutron] support of NSH in networking-SFC
> 
> On Wed, Jun 01, 2016 at 12:08:23AM +0000, Yang, Yi Y wrote:
> > Ben, yes, we submitted nsh support patch set last year, but ovs 
> > community told me we have to push kernel part into Linux kernel tree, 
> > we're struggling to do this, but something blocked us from doing this.
> 
> It's quite difficult to get patches for a new protocol into the kernel.
> You have my sympathy.
> 
> > Recently, ovs did some changes in tunnel protocols which requires the 
> > packet decapsulated by a tunnel must be a Ethernet packet, but Linux 
> > kernel (net-next) tree accepted VxLAN-gpe patch set from Redhat guy 
> > (Jiri Benc) which requires the packet decapsulated by VxLAN-gpe port 
> > must be L3 packet but not L2 Ethernet packet, this blocked us from 
> > progressing better.
> > 
> > Simon Horman (Netronome guy) has posted a series of patches to remove 
> > the mandatory requirement from ovs in order that the packet from a 
> > tunnel can be any packet, but so far we didn't see they are merged.
> 
> These are slowly working their way through OVS review, but these also have a prerequisite on kernel patches, so it's not easy to get them in either.
> 
> > I heard ovs community looks forward to getting nsh patches merged, it 
> > will be great if ovs guys can help progress this.
> 
> I do plan to do my part in review (but much of this is kernel review, which I'm not really involved in anymore).
> 
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