DPDK patches and discussions
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From: "Kusztal, ArkadiuszX" <arkadiuszx.kusztal@intel.com>
To: "Trahe, Fiona" <fiona.trahe@intel.com>,
	Thomas Monjalon <thomas@monjalon.net>
Cc: David Marchand <david.marchand@redhat.com>,
	"nhorman@tuxdriver.com" <nhorman@tuxdriver.com>,
	"bluca@debian.org" <bluca@debian.org>,
	"ktraynor@redhat.com" <ktraynor@redhat.com>,
	Ray Kinsella <mdr@ashroe.eu>, "dev@dpdk.org" <dev@dpdk.org>,
	Akhil Goyal <akhil.goyal@nxp.com>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>, Anoob Joseph <anoobj@marvell.com>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	"Mcnamara, John" <john.mcnamara@intel.com>,
	"dodji@seketeli.net" <dodji@seketeli.net>,
	Andrew Rybchenko <arybchenko@solarflare.com>,
	"aconole@redhat.com" <aconole@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v2 4/4] add ABI checks
Date: Thu, 13 Feb 2020 14:51:29 +0000
Message-ID: <BYAPR11MB383131CC805B304940E632B39F1A0@BYAPR11MB3831.namprd11.prod.outlook.com> (raw)
In-Reply-To: <BN6PR11MB17961C321FB6446CE9440C88E4030@BN6PR11MB1796.namprd11.prod.outlook.com>

Hi,

Two comments from me,

> > > The patch we're working on will provide two versions of
> > > rte_cryptodev_info_get(), both call the same PMD function from the
> dev_ops info_get fn ptr.
> > > The default version operates s as normal, the 19.11 version searches
> > > through the list returned by the PMD, looking for sym.aead.algo =
> > > ChaChaPoly, it needs to strip it from
> > the list.
> > > As PMDs just pass a ptr to their capabilities list ( it isn't a
> > > linked list, but an array with an end marker  =
> > > RTE_CRYPTODEV_END_OF_CAPABILITIES_LIST) if the API layer detects
> > > Chacha it must allocate some space and store a local copy of the trimmed
> list. This must be stored only once per device. 
[Arek] The problem with this solution is that we need to allocate memory.
So the question is how to handle unlikely case of malloc error when we operate inside void function rte_cryptodev_info_get?
And even if we would pass somehow error condition to the caller then what to do is another question.

> >
> > I don't understand what you have to store.
> > Can't you just set the algo to 0 if it is ChaCha?
> [Fiona] it returns a pointer to data in the PMD domain, which the API couldn't
> and shouldn't overwrite, e.g.
> static const struct rte_cryptodev_capabilities qat_gen3_sym_capabilities[]
Should we print user some information
> 
> >
> > > This versioning will apply to any PMD which wants to take advantage
> > > of the new API between now and
> > 20.11.
> > >
> > > Note, I expect the ABI checker tools will still complain of ABI
> > > breakage as the LIST_END value will still
> > change.
> >
> > Right, you need to update the ignore list for the tool.
> >
> > > We are also reviewing all other cryptodev APIs in case there is any other
> API which needs versioning.
> > >
> > > Anyone see any problem with this approach?
> >
> > The other issue is with all other functions accepting this enum as input.
> > We should continue returning an error if getting Chacha as input with
> > 19.11 version of these functions.
> > But I would tend to consider this small ABI breakage can be ignored as
> > it is in the error path.
> [Fiona] The QAT PMD tests for and handles this error. I expect other PMDs
> do too.
[Arek] - Yes, it is error path but on the other hand we explicitly specify what value we will return when calling
rte_cryptodev_sym_session_init so caller may expect EINVAL when wrong algorithm value selected (usually it probably will be ENOTSUP).
In this case when setting 3 (LIST_END) on 19.11 app and linking against 20.02 (assuming with Chacha) shared build, caller would get success on return and fully set chacha session,
which will probably result in undefined behavior.
So shouldn't this function be versioned as well then?

Regards,
Arek




  reply index

Thread overview: 104+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-20 15:20 [dpdk-dev] [PATCH] " David Marchand
2019-12-20 15:32 ` Richardson, Bruce
2019-12-20 16:20   ` Kinsella, Ray
2019-12-20 21:00     ` Thomas Monjalon
2020-01-06 13:17       ` Aaron Conole
2020-01-15 13:07         ` Burakov, Anatoly
2020-01-14 23:19     ` Thomas Monjalon
2020-01-15 11:33       ` Neil Horman
2020-01-15 12:38         ` Thomas Monjalon
2020-01-16 11:52           ` Neil Horman
2020-01-16 14:20             ` Thomas Monjalon
2020-01-16 18:49               ` Neil Horman
2020-01-16 20:01                 ` Thomas Monjalon
2020-01-17 19:01                   ` Neil Horman
2020-01-17 21:26                     ` David Marchand
2019-12-20 20:25 ` Neil Horman
2020-01-29 17:26 ` [dpdk-dev] [PATCH v2 0/4] " David Marchand
2020-01-29 17:26   ` [dpdk-dev] [PATCH v2 1/4] hash: fix meson headers packaging David Marchand
2020-01-30 10:12     ` Luca Boccassi
2020-01-30 10:54       ` David Marchand
2020-01-30 10:56         ` Luca Boccassi
2020-01-29 17:26   ` [dpdk-dev] [PATCH v2 2/4] build: split build helper David Marchand
2020-01-29 17:26   ` [dpdk-dev] [PATCH v2 3/4] build: test meson installation David Marchand
2020-01-29 17:26   ` [dpdk-dev] [PATCH v2 4/4] add ABI checks David Marchand
2020-01-29 17:42     ` Thomas Monjalon
2020-01-29 18:10       ` Anoob Joseph
2020-01-29 20:03         ` David Marchand
2020-01-29 20:13           ` Akhil Goyal
2020-01-30 16:09             ` Ferruh Yigit
2020-01-30 20:18               ` Thomas Monjalon
2020-01-31  9:03                 ` Ferruh Yigit
2020-01-31 10:26                   ` Ananyev, Konstantin
2020-01-31 14:16                 ` Trahe, Fiona
2020-02-02 13:05                   ` Thomas Monjalon
2020-02-02 14:41                     ` Ananyev, Konstantin
2020-02-03  9:30                       ` Ferruh Yigit
2020-02-03 11:50                         ` Neil Horman
2020-02-03 13:09                           ` Ferruh Yigit
2020-02-03 14:00                             ` Dodji Seketeli
2020-02-03 14:46                               ` Ferruh Yigit
2020-02-03 15:08                             ` Trahe, Fiona
2020-02-03 17:09                         ` Thomas Monjalon
2020-02-03 17:34                           ` Thomas Monjalon
2020-02-03 18:55                             ` Ray Kinsella
2020-02-03 21:07                               ` Thomas Monjalon
2020-02-04  9:46                                 ` Ferruh Yigit
2020-02-04 10:24                                 ` Thomas Monjalon
2020-02-04 12:44                                   ` Trahe, Fiona
2020-02-04 15:52                                     ` Trahe, Fiona
2020-02-04 15:59                                       ` Thomas Monjalon
2020-02-04 17:46                                         ` Trahe, Fiona
2020-02-13 14:51                                           ` Kusztal, ArkadiuszX [this message]
2020-03-16 12:57                                             ` Trahe, Fiona
2020-03-16 13:09                                               ` Thomas Monjalon
2020-03-17 13:27                                                 ` Kusztal, ArkadiuszX
2020-03-17 15:10                                                   ` Thomas Monjalon
2020-03-17 19:10                                                     ` Kusztal, ArkadiuszX
2020-02-04 12:57                                   ` Kevin Traynor
2020-02-04 14:44                                   ` Aaron Conole
2020-02-04 19:49                                     ` Neil Horman
2020-02-04  9:51                               ` David Marchand
2020-02-04 10:10                                 ` Trahe, Fiona
2020-02-04 10:38                                   ` Thomas Monjalon
2020-02-05 11:10                                 ` Ray Kinsella
2020-02-03 17:40                           ` Ferruh Yigit
2020-02-03 18:40                             ` Thomas Monjalon
2020-02-04  9:19                               ` Ferruh Yigit
2020-02-04  9:45                                 ` Thomas Monjalon
2020-02-04  9:56                                   ` Ferruh Yigit
2020-02-04 10:08                                     ` Bruce Richardson
2020-02-04 10:17                                     ` Kevin Traynor
2020-02-04 10:16                             ` Akhil Goyal
2020-02-04 10:28                               ` Thomas Monjalon
2020-02-04 10:32                                 ` Akhil Goyal
2020-02-04 11:35                                   ` Bruce Richardson
2020-02-04 22:10                                   ` Neil Horman
2020-02-05  6:16                                     ` [dpdk-dev] [EXT] " Anoob Joseph
2020-02-05 14:33                                       ` Trahe, Fiona
2020-02-04 21:59                               ` [dpdk-dev] " Neil Horman
2020-01-30 13:06         ` Trahe, Fiona
2020-01-30 15:59           ` Thomas Monjalon
2020-01-30 16:42             ` Ferruh Yigit
2020-01-30 23:49             ` Ananyev, Konstantin
2020-01-31  9:07               ` Ferruh Yigit
2020-01-31  9:37                 ` Ananyev, Konstantin
2020-01-30 10:57   ` [dpdk-dev] [PATCH v2 0/4] " Luca Boccassi
2020-01-30 16:00 ` [dpdk-dev] [PATCH v3 " David Marchand
2020-01-30 16:00   ` [dpdk-dev] [PATCH v3 1/4] hash: fix meson headers packaging David Marchand
2020-01-30 18:01     ` Wang, Yipeng1
2020-01-30 18:40       ` Honnappa Nagarahalli
2020-02-05 19:51         ` Wang, Yipeng1
2020-01-30 16:00   ` [dpdk-dev] [PATCH v3 2/4] build: split build helper David Marchand
2020-01-30 16:00   ` [dpdk-dev] [PATCH v3 3/4] build: test meson installation David Marchand
2020-01-30 22:17     ` Thomas Monjalon
2020-01-30 16:00   ` [dpdk-dev] [PATCH v3 4/4] add ABI checks David Marchand
2020-01-30 22:32     ` Thomas Monjalon
2020-02-01 15:29       ` David Marchand
2020-01-30 22:44     ` Thomas Monjalon
2020-02-02 21:08 ` [dpdk-dev] [PATCH v4 0/3] " David Marchand
2020-02-02 21:08   ` [dpdk-dev] [PATCH v4 1/3] hash: fix meson headers packaging David Marchand
2020-02-05 19:53     ` Wang, Yipeng1
2020-02-02 21:08   ` [dpdk-dev] [PATCH v4 2/3] build: split build helper David Marchand
2020-02-02 21:08   ` [dpdk-dev] [PATCH v4 3/3] add ABI checks David Marchand
2020-02-05 14:13   ` [dpdk-dev] [PATCH v4 0/3] " Thomas Monjalon

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