Hi there! I would like to find out what is the policy regarding changes to the DPDK's kmod drivers such as igb_uio.ko within a DPDK's LTS release. Are these changes backward compatible? For example, is there a guarantee that an application built against 19.11.5, where igb_uio.ko received changes,would run with this driver built from 19.11.1 version? Does http://doc.dpdk.org/guides/contributing/stable.html section 8.4 apply to kmod drivers as well? Thanks. Alex Kotliarov
24/09/2020 19:12, Alexander Kotliarov:
> Hi there!
> I would like to find out what is the policy regarding changes to the DPDK's
> kmod drivers such as igb_uio.ko within a DPDK's LTS release. Are these
> changes backward compatible?
> For example, is there a guarantee that an application built
> against 19.11.5, where igb_uio.ko received changes,would run with this
> driver built from 19.11.1 version?
>
> Does http://doc.dpdk.org/guides/contributing/stable.html section 8.4 apply
> to kmod drivers as well?
There is no such formal guarantee, but in my opinion,
it should be the case. Do you imagine a change in kmod
which could break a DPDK version?
On Thu, 29 Oct 2020 22:07:38 +0100
Thomas Monjalon <thomas@monjalon.net> wrote:
> 24/09/2020 19:12, Alexander Kotliarov:
> > Hi there!
> > I would like to find out what is the policy regarding changes to the DPDK's
> > kmod drivers such as igb_uio.ko within a DPDK's LTS release. Are these
> > changes backward compatible?
> > For example, is there a guarantee that an application built
> > against 19.11.5, where igb_uio.ko received changes,would run with this
> > driver built from 19.11.1 version?
> >
> > Does http://doc.dpdk.org/guides/contributing/stable.html section 8.4 apply
> > to kmod drivers as well?
>
> There is no such formal guarantee, but in my opinion,
> it should be the case. Do you imagine a change in kmod
> which could break a DPDK version?
Why do you still need to use igb_uio?
Can you use vfio instead?
On 29/10/2020 21:07, Thomas Monjalon wrote:
> 24/09/2020 19:12, Alexander Kotliarov:
>> Hi there!
>> I would like to find out what is the policy regarding changes to the DPDK's
>> kmod drivers such as igb_uio.ko within a DPDK's LTS release. Are these
>> changes backward compatible?
>> For example, is there a guarantee that an application built
>> against 19.11.5, where igb_uio.ko received changes,would run with this
>> driver built from 19.11.1 version?
>>
>> Does http://doc.dpdk.org/guides/contributing/stable.html section 8.4 apply
>> to kmod drivers as well?
>
> There is no such formal guarantee, but in my opinion,
> it should be the case. Do you imagine a change in kmod
> which could break a DPDK version?
>
We never said anything specifically about the kmods (kni or igb_uio).
There is always a possibility a change here could break DPDK, however remote.
More probable for KNI than igb_uio.
Ray K