[Intel-wired-lan] 710/i40e, RSS and 802.1ad (double vlan)

[Jesse Brandeburg]

On 2/11/2021 5:49 PM, Jesse Brandeburg wrote:
> Dan Siemon wrote:
> 
>> On Tue, 2021-02-09 at 12:02 -0800, Jesse Brandeburg wrote:
>>> Please provide us with which driver/kernel/firmware you're running,
>>> uname -a
>>> ethtool -i ethx
>>> lspci -vvv -s < your pci bus:dev.fn>
>>
>> We are ok to update to the latest 710 firmware and we follow the kernel
>> releases closely.
>>
>> As we haven't had problems related to firmware, we still have many 710s
>> in the field that are on 6.01 firmware. Below are dumps from a couple
>> of our test boxes where I have upgraded the firmware.
> 
> Hi Dan, thanks for the detail, I think your firmware is new enough, but
> I'm pretty sure our driver isn't configuring enough (it's currently an
> unsupported feature in Linux i40e) to get it working. Newer than 6.01 is
> all I know of that is required for firmware based on what I know right
> now.
> 
> I've filed an internal issue tracker against i40e and sometime
> (hopefully) soon we'll have the team looking into details. I don't have
> any timeline for you currently, sorry.
> 
> I agree this is an important use case. We appreciate your reporting the
> issue to us. Based on what I found when doing some initial triage, it
> doesn't seem like a simple fix in the code, so I can't offer you a
> patch to fix the issue like I wish I could.
> 
> Please keep us posted if you find any other relevant details, and I'll
> try to update this thread if we find any info or get a test patch up
> and running.

An update to this old thread:
The current i40e out-of-tree driver from intel.com/e1000.sf.net has 
support for a limited use case of double vlan for virtual machines (VFs) 
but the interface used is customer specific and not upstream (it's in 
sysfs).

In the meantime, I guess your best bet is DPDK. Currently an 
implementation for the upstream kernel is not available and I don't know 
when it will become so.

Thanks for your patience on this one, I'm working with the team to make 
sure we don't create feature gaps like this between out-of-tree and 
upstream in the future. I appreciate that you brought this to our attention.

Thanks,
  Jesse