[PATCH v1] bbdev: add device status info

[Chautru, Nicolas]

Hi Stephen, 

> -----Original Message-----
> From: Stephen Hemminger <stephen at networkplumber.org>
> Sent: Tuesday, June 7, 2022 9:43 AM
> To: Maxime Coquelin <maxime.coquelin at redhat.com>
> Cc: Chautru, Nicolas <nicolas.chautru at intel.com>; dev at dpdk.org;
> gakhil at marvell.com; trix at redhat.com; hemant.agrawal at nxp.com; Vargas,
> Hernan <hernan.vargas at intel.com>
> Subject: Re: [PATCH v1] bbdev: add device status info
> 
> On Tue, 7 Jun 2022 18:20:38 +0200
> Maxime Coquelin <maxime.coquelin at redhat.com> wrote:
> 
> > Hi Nicolas,
> >
> > On 6/7/22 17:44, Chautru, Nicolas wrote:
> > > Hi Maxime,
> > >
> > >> -----Original Message-----
> > >> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> > >> Sent: Tuesday, June 7, 2022 5:43 AM
> > >> To: Stephen Hemminger <stephen at networkplumber.org>; Chautru,
> > >> Nicolas <nicolas.chautru at intel.com>
> > >> Cc: dev at dpdk.org; gakhil at marvell.com; trix at redhat.com;
> > >> hemant.agrawal at nxp.com; Vargas, Hernan
> <hernan.vargas at intel.com>
> > >> Subject: Re: [PATCH v1] bbdev: add device status info
> > >>
> > >> Hi Stephen,
> > >>
> > >> On 6/7/22 02:09, Stephen Hemminger wrote:
> > >>> On Mon,  6 Jun 2022 15:50:08 -0700 Nicolas Chautru
> > >>> <nicolas.chautru at intel.com> wrote:
> > >>>
> > >>>> @@ -298,6 +313,8 @@ struct rte_bbdev_driver_info {
> > >>>>    	const struct rte_bbdev_op_cap *capabilities;
> > >>>>    	/** Device cpu_flag requirements */
> > >>>>    	const enum rte_cpu_flag_t *cpu_flag_reqs;
> > >>>> +	/** Device Status */
> > >>>> +	enum rte_bbdev_device_status device_status;
> > >>>>    };
> > >>>>
> > >>>
> > >>> This ends up being an ABI breakage, can't change a struct like
> > >>> that until 22.11 release.
> > >>>
> > >>
> > >> Indeed, but Nicolas mentioned in the cover-letter that the patch
> > >> targets v22.11; not this release.
> > >>
> > >> However, a deprecation notice should be sent for v22.07 if it
> > >> hasn't been done yet.
> > >
> > > I have sent this deprecation Maxime:
> > > https://patches.dpdk.org/project/dpdk/patch/1647542252-35727-2-git-s
> > > end-email-nicolas.chautru at intel.com/
> > > Do you believe this needs to be extended to cover more details the
> > > change and including this device status info explicitly? I can
> > > update the verbiage in more details if required
> >
> > Thanks for the pointer, I missed it.
> > Reading the deprecation notice, it is not clear to me it is about the
> > device status info enum.
> >
> > Maybe rewording it a bit to be more specific would help.
> 
> You might want to use one the existing empty padding slots (holes) in that
> structure. It appears to have been laid out haphazardly.
> 

I don't see such one single hole to fill that enum but I can shuffle a bit that structure. In that case total size would no longer change but a few offsets would differ and padding would be reduced.
Thanks

Nic