[RFC PATCH] virtio_net: Extend virtio to use VF datapath when available

Samudrala, Sridhar
Tue, 19 Dec 2017 19:42:34 -0000

On 12/19/2017 10:41 AM, Stephen Hemminger wrote:
> On Tue, 19 Dec 2017 13:21:17 -0500 (EST)
> David Miller <davem at davemloft.net> wrote:
>
>> From: Stephen Hemminger <stephen at networkplumber.org>
>> Date: Tue, 19 Dec 2017 09:55:48 -0800
>>
>>> could be 10ms, just enough to let udev do its renaming
>> Please, move to some kind of notification or event based handling of
>> this problem.
>>
>> No delay is safe, what if userspace gets swapped out or whatever
>> else might make userspace stall unexpectedly?
>>
> The plan is to remove the delay and do the naming in the kernel.
> This was suggested by Lennart since udev is only doing naming policy
> because kernel names were not repeatable.
>
> This makes the VF show up as "ethN_vf" on Hyper-V which is user
friendly.
>
> Patch is pending.
Do we really need to delay the setup until the name is changed?
Can't we call dev_set_mtu() and dev_open() until dev_change_name() is done?

Thanks
Sridhar