Ben Pfaff <b...@ovn.org> wrote on 05/19/2016 12:02:50 PM:

> From: Ben Pfaff <b...@ovn.org>
> To: Ryan Moats/Omaha/IBM@IBMUS
> Cc: dev@openvswitch.org
> Date: 05/19/2016 12:03 PM
> Subject: Re: [ovs-dev,v16,1/5] Change encaps_run to work incrementally
>
> On Thu, May 19, 2016 at 11:52:05AM -0500, Ryan Moats wrote:
> > Ben Pfaff <b...@ovn.org> wrote on 05/19/2016 10:32:53 AM:
> >
> > > From: Ben Pfaff <b...@ovn.org>
> > > To: Ryan Moats/Omaha/IBM@IBMUS
> > > Cc: dev@openvswitch.org
> > > Date: 05/19/2016 10:33 AM
> > > Subject: Re: [ovs-dev,v16,1/5] Change encaps_run to work
incrementally
> > >
> > > On Thu, May 19, 2016 at 10:02:08AM -0500, Ryan Moats wrote:
> > > > Ben Pfaff <b...@ovn.org> wrote on 05/17/2016 10:13:19 PM:
> > > >
> > > > > From: Ben Pfaff <b...@ovn.org>
> > > > > To: Ryan Moats/Omaha/IBM@IBMUS
> > > > > Cc: dev@openvswitch.org
> > > > > Date: 05/17/2016 10:14 PM
> > > > > Subject: Re: [ovs-dev,v16,1/5] Change encaps_run to work
> > incrementally
> > > > >
> > > > > On Mon, May 02, 2016 at 10:26:54AM -0500, Ryan Moats wrote:
> > > > > > As a side effect, tunnel context is persisted.
> > > > > >
> > > > > > Signed-off-by: Ryan Moats <rmo...@us.ibm.com>
> > > > >
> > > > > Thanks for updating this.
> > > >
> > > > and thanks for looking - sorry for the delayed reply (I've been
> > > > doing OVN training the past couple of days)
> > > >
> > > > > In a couple of places, this uses hmap_first_with_hash() to find
an
> > > > > element in a hash table.  ovn-controller uses this method in some
> > > > > special cases where the hash value is known to be unique; for
> > example, I
> > > > > think that it's used for a hash table where the "hash" is the
> > assigned
> > > > > logical datapath ID, which is a unique 32-bit (maybe shorter? I
don't
> > > > > recall at the moment) number.  But that trick doesn't work when
the
> > hash
> > > > > value is really a hash.  For example, it can't be used in this
code
> > > > > where the hash is taken from a UUID, because there might be
multiple
> > > > > UUIDs with the same hash value.  It's necessary, instead, to
iterate
> > > > > through the items that have the desired hash value, with
> > > > > HMAP_FOR_EACH_WITH_HASH, and then compare the item's full key
instead
> > of
> > > > > just the hash.
> > > >
> > > > Ugh - I thought I had changed that, but when I couple this with
your
> > > > comments below, I'm thinking I've confused myself as to what
patches
> > > > I have and haven't pushed
> > > >
> > > > > In the process_full_encaps case, I don't see what removes tunnels
> > that
> > > > > are no longer needed.
> > > > >
> > > > > This has some TODOs and commented-out code in it, so I suspect
that
> > it's
> > > > > not really ready for full review?
> > > >
> > > > As I implied above, those shouldn't be there, so now I'm suspicious
if
> > I've
> > > > lost track of a ball that I've been juggling... Since I've got to
> > rebase
> > > > the rest of the patches anyway, adding this one to the list won't
add
> > > > that much additional effort...
> > >
> > > Yeah, it did seem weird, since going into it I expected that this
patch
> > > was ready.  I'll look forward to the next version.
> > >
> >
> > I've found the right code for encaps.c and re-looking at the tunnel
> > update path, I'm really dubious about it being correct - I'm out this
> > afternoon (CDT) for a HS graduation, but if I post just the first patch
> > as an RFC how soon would it capture eyeballs?  I ask because if it will
> > be a while, then I'll just work through the rest of the patches first.
>
> I think it'll be a while, because I'm trying to get from code review
> back to coding.

Ok, then I'll just go ahead and work through the whole set then...
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