Leon Romanovsky wrote: > > 3) Plan is to make the "new" iavf driver the default iavf once > > extensive regression testing can be completed. > > a. Current proposal is to make CONFIG_IAVF have a sub-option > > CONFIG_IAVF_V2 that lets the user adopt the new code, > > without changing the config for existing users or breaking > > them. > > I don't think that .config options are considered ABIs, so it is unclear > what do you mean by saying "disrupting current users". Instead of the > complication wrote above, do like any other driver does: perform your > testing, submit the code and switch to the new code at the same time.
Because this VF driver runs on multiple hardware PFs (they all expose the same VF device ID) the testing matrix is quite huge and will take us a while to get through it. We aim to avoid making users's life hard by having CONFIG_IAVF=m become a surprise new code base behind the back of the user. I've always thought that the .config options *are* a sort of ABI, because when you do "make oldconfig" it tries to pick up your previous configuration and if, for instance, a driver changes it's Kconfig name, it will not pick up the old value of the old driver Kconfig name for the new build, and with either default or ask the user. The way we're proposing I think will allow the old driver to stay default until the user answers Y to the "new option" for the new, iecm based code. > > [1] > > https://lore.kernel.org/netdev/20200824173306.3178343-1-anthony.l.ngu...@intel.com/ > > Please don't introduce module parameters in new code. Thanks, we certainly won't. :-) I'm not sure why you commented about module parameters, but the above link is to the previous submission for a new driver that uses some common code as a module (iecm) for a new device driver (idpf) we had sent. The point of this email was to solicit feedback and give notice about doing a complicated refactor/replace where we end up re-using iecm for the new version of the iavf code, with the intent to be up front and working with the community throughout the process. Because of the complexity, we want do the right thing the first time so we can to avoid a restart/redesign. Thanks, Jesse
