Re: virtio-net: bind systematically on all non blacklisted virtio-net devices

[Franck Baudin <franck.baudin@qosmos.com>]

On 09/09/15 04:11, Ouyang, Changchun wrote:
>
>> -----Original Message-----
>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Franck Baudin
>> Sent: Tuesday, September 8, 2015 4:23 PM
>> To: dev@dpdk.org
>> Subject: [dpdk-dev] virtio-net: bind systematically on all non blacklisted
>> virtio-net devices
>>
>> Hi,
>>
>> virtio-net driver bind on all virtio-net devices, even if the devices are used by
>> the kernel (leading to kernel soft-lookup/panic). One way around is to
>> blacklist the ports in use by Linux. This is the case since v2.0.0, in fact since
>> commit da978dfdc43b59e290a46d7ece5fd19ce79a1162
>> and the removal of the RTE_PCI_DRV_NEED_MAPPING driver flag.
> It allows virtio-pmd not necessarily depend on igb_uio, this is which characteristic other pmd drivers don't have.
Thanks for your answer,

So this is the expected behaviour: all virtio interfaces are bound to 
the pmd driver.

Don't you think that dpdk_nic_bind.py should reflect the driver 
behaviour, and that the virtio documentation (still referencing igb_uio) 
be amended?

Regards,
Franck

>
>> Questions:
>>       1/ Is it the expected behaviour?
>>       2/ Why is it different from vmxnet3 pmd? In other words, should't we re-
>> add the RTE_PCI_DRV_NEED_MAPPING to virtio pmd or remove it from
>> pmxnet3 pmd?
>>       3/ If this is the expected behaviour, shouldn't we update
>> dpdk_nic_bind.py (binding status irrelevant for virtio) tool and the
>> documentation (mentioning igb_uio while misleading and useless)?
>>
>> Thanks!
>>
>> Best Regards,
>> Franck
>>
>>
>>