From: Ferruh Yigit <ferruh.yigit@intel.com>
To: "Xia, Chenbo" <chenbo.xia@intel.com>,
"Burakov, Anatoly" <anatoly.burakov@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
David Marchand <david.marchand@redhat.com>,
Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [dpdk-dev] [PATCH v1 1/2] vfio: make API return values consistent
Date: Thu, 28 Oct 2021 12:32:39 +0100 [thread overview]
Message-ID: <632abf1f-e912-4732-0c4e-893eb8679024@intel.com> (raw)
In-Reply-To: <SN6PR11MB35040B9B8DFD24DBED992BB99C869@SN6PR11MB3504.namprd11.prod.outlook.com>
On 10/28/2021 12:11 PM, Xia, Chenbo wrote:
>> -----Original Message-----
>> From: Burakov, Anatoly <anatoly.burakov@intel.com>
>> Sent: Thursday, October 28, 2021 6:30 PM
>> To: Xia, Chenbo <chenbo.xia@intel.com>; dev@dpdk.org
>> Subject: Re: [dpdk-dev] [PATCH v1 1/2] vfio: make API return values consistent
>>
>> Hi Chenbo,
>>
>>> And do we need backport? As 'return -1' does not align with the API doxygen.
>>>
>>> Thanks,
>>> Chenbo
>>>
>> Maybe it's the FreeBSD implementation that needs to be adjusted then,
>> because none of those functions are valid on FreeBSD, and the
>> documentation for VFIO functions explicitly mentions that on FreeBSD,
>> they should return an error. I went with adjusting Linux implementation
>> to minimize the amount of changes we have to make (and only change code
>> path that no one uses in the first place), but maybe that was a wrong
>> decision.
>>
>> I'm not sure if changing the API return value to match what was
>> documented counts as an API change, so maybe backport to stable is not
>> advised here.
>
> It's not a API change. My point is whether VFIO is present, users just use
> the API to check if vfio support is there. In a kernel version that does not
> support VFIO, he uses 'if(rte_vfio_is_enabled(XXX))' to check as the doxygen
> says its return value should be 1 as true or 0 as false. He will get true (-1)
> but VFIO is not there. That's why I think it's a bug and should be backported.
>
> But I think we can first discuss if we should drop the dummy implementation
> as DPDK requires Linux kernel version >= 4.4 now so VFIO is always present.
> I think it depends on by saying 'DPDK requires kernel version >= 4.4'. It's
> a real _requirement_ or only a recommendation?
>
> Ferruh, David & Thomas, What do you think?
>
My understanding is, it is a requirement. DPDK does not guarantee support for
kernels < 4.4.
next prev parent reply other threads:[~2021-10-28 11:32 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-16 10:36 Anatoly Burakov
2021-09-16 10:36 ` [dpdk-dev] [PATCH v1 2/2] vfio: add errno on unsupported platforms Anatoly Burakov
2021-09-16 10:39 ` Bruce Richardson
2021-09-22 3:31 ` Xia, Chenbo
2021-09-22 3:30 ` [dpdk-dev] [PATCH v1 1/2] vfio: make API return values consistent Xia, Chenbo
2021-09-22 9:26 ` Ferruh Yigit
2021-09-22 11:30 ` Xia, Chenbo
2021-10-28 8:21 ` David Marchand
2021-10-28 10:29 ` Burakov, Anatoly
2021-10-28 11:11 ` Xia, Chenbo
2021-10-28 11:32 ` Ferruh Yigit [this message]
2021-10-28 13:00 ` Burakov, Anatoly
2021-10-28 14:53 ` Thomas Monjalon
2021-10-28 15:40 ` Burakov, Anatoly
2021-10-28 16:38 ` Stephen Hemminger
2021-10-28 13:49 ` [dpdk-dev] [PATCH v2 1/4] vfio: drop fallback Linux implementation Anatoly Burakov
2021-10-28 13:49 ` [dpdk-dev] [PATCH v2 2/4] vfio: fix wrong return value for FreeBSD Anatoly Burakov
2021-10-28 13:49 ` [dpdk-dev] [PATCH v2 3/4] vfio: fix documentation to match intended behavior Anatoly Burakov
2021-10-28 13:49 ` [dpdk-dev] [PATCH v2 4/4] vfio: add errno on unsupported platforms Anatoly Burakov
2021-10-28 14:13 ` Burakov, Anatoly
2021-10-28 14:15 ` [dpdk-dev] [PATCH v3 1/4] vfio: drop fallback Linux implementation Anatoly Burakov
2021-10-28 14:15 ` [dpdk-dev] [PATCH v3 2/4] vfio: fix wrong return value for FreeBSD Anatoly Burakov
2021-11-05 2:50 ` Xia, Chenbo
2021-10-28 14:15 ` [dpdk-dev] [PATCH v3 3/4] vfio: fix documentation to match intended behavior Anatoly Burakov
2021-11-05 2:57 ` [dpdk-dev] [dpdk-stable] " Xia, Chenbo
2021-10-28 14:15 ` [dpdk-dev] [PATCH v3 4/4] vfio: add errno on unsupported platforms Anatoly Burakov
2021-11-08 15:55 ` [dpdk-dev] [dpdk-stable] " David Marchand
2021-11-01 6:27 ` [dpdk-dev] [PATCH v3 1/4] vfio: drop fallback Linux implementation Xia, Chenbo
2021-11-01 13:57 ` Burakov, Anatoly
2021-11-05 2:48 ` Xia, Chenbo
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