[dpdk-dev] Having troubles binding an SR-IOV VF to uio_pci_generic on Amazon instance
Avi Kivity
avi at scylladb.com
Thu Oct 1 11:43:53 CEST 2015
On 10/01/2015 12:42 PM, Vincent JARDIN wrote:
> On 01/10/2015 11:22, Avi Kivity wrote:
>>> As far as I could see, without this kind of motivation, people do not
>>> even want to try.
>>
>> You are mistaken. The problem is a lot harder than you think.
>>
>> People didn't go and write userspace drivers because they were lazy.
>> They wrote them because there was no other way.
>
> I disagree, it is possible to write a 'partial' userspace driver.
>
> Here it is an example:
> http://dpdk.org/browse/dpdk/tree/drivers/net/mlx4
>
> It benefits of the kernel's capabilities while the userland manages
> only the IOs.
>
That is because the device itself contains an iommu.
> There were some tentative to get it for other (older) drivers, named
> 'bifurcated drivers', but it is stalled.
IIRC they still exposed the ring to userspace.
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