Re: [dpdk-stable] [PATCH] meter: move RFC4115 trTCM APIs as none experimental

[David Marchand <david.marchand@redhat.com>]

On Thu, Jan 16, 2020 at 3:38 PM Thomas Monjalon <thomas@monjalon.net> wrote:
>
> 16/01/2020 13:42, Ferruh Yigit:
> > On 1/16/2020 11:54 AM, Neil Horman wrote:
> > > On Thu, Jan 16, 2020 at 12:25:06PM +0100, David Marchand wrote:
> > >> On Tue, Dec 17, 2019 at 2:08 PM Eelco Chaudron <echaudro@redhat.com> wrote:
> > >>>
> > >>> Moved RFC4115 APIs to none experimental as they have been there
> > >>> since 19.02. Also, these APIs are the same as the none RFC4115 APIs.
> > >>>
> > >>> Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
> > >>
> > >> There is a discussion on the OVS ml at the moment to get these symbols
> > >> in the stable ABI for 19.11.
> > >> I want to understand how this would be done.
> > >>
> > >> - I take this patch in 20.02, these symbols are added in the 20.0.1 ABI.
> > >> On the other hand, the 19.11 release maintains the 20.0 ABI.
> > >>
> > >> Does it mean the backport adds these symbols with the 20.0 version in
> > >> the 19.11 branch?
> > >> Or is 20.0.1 version acceptable / a thing we want?
>
> We cannot have the symbol with different versions in different releases,
> otherwise the compatibility is broken when upgrading.
> So we have no choice, the symbol must have version 20.0.1
> in release 19.11.1, as in release 20.02.

Indeed, good point.


> > >> - These symbol already existed in the 20.0 ABI, versioned as EXPERIMENTAL.
> > >> We can go and remove these entries since we are not bound to preserve
> > >> the experimental APIs.
> > >> But, on the other hand, nothing should prevent us from keeping some
> > >> aliases so that the symbols versioned EXPERIMENTAL are still available
> > >> to existing users.
> > >>
> > > I would say that choice is up to you.  If you want to alias them to be nice to
> > > prior users, thats fine by me. But experimental means experimental, and so users
> > > have to be prepared to rebuild when things change, even if that change is
> > > changing the version from experimental to a concrete version.
> > >
> >
> > I would prefer to keep the alias and don't break the existing users, specially
> > for the case experimental API is becoming mature without change.
>
> I agree, it's cool to be nice :)

Luca, opinion?


-- 
David Marchand