[dpdk-dev] [PATCH v8 00/25] Support VFD on i40e

JOSHI, KAUSTUBH (KAUSTUBH) kaustubh at research.att.com
Wed Jan 11 15:49:45 CET 2017

When Alex from our team started working on Niantic last year, the following were the list of gaps in the kernel drivers we had a need to fill:

Direct traffic to VF based on more than one outer VLAN tags
Optionally strip on ingress (to PF) and insert on egress VLAN tag
Disable/enable MAC and VLAN anti spoofing separately
Mirror traffic from one VF to the other
Enable/Disable local switching per VF
Collect statistics per VF pkts/octets in/out
Enable/disable Mcast/unknown unicast per VF
Manage up to 8 TC per VF with one strict priority queue
Manage per VF per TC bandwidth allocations
Manage LACP status visibility to the VFs (for NIC teaming using SRIOV)

Most of these are VF management functions, and there is no standardized way to do VF management in the kernel drivers. Besides, most of the use-cases around SRIOV need DPDK in the VF anyway (so the target communities are aligned) and the PF DPDK driver for ixgbe already existed, so it made sense to add them there - no forking of the PF driver was involved and there is no additional duplicate code.



On Jan 11, 2017, at 6:03 AM, Vincent Jardin <vincent.jardin at 6wind.com<mailto:vincent.jardin at 6wind.com>> wrote:

Please can you list the gaps of the Kernel API?

Thank you,

Le 11 janvier 2017 3:59:45 AM "JOSHI, KAUSTUBH  (KAUSTUBH)" <kaustubh at research.att.com<mailto:kaustubh at research.att.com>> a écrit :

Hi Vincent,

Greetings! Jumping into this debate a bit late, but let me share our point of view based on how we are using this code within AT&T for our NFV cloud.

Actually, we first started with trying to do the configuration within the kernel drivers as you suggest, but quickly realized that besides the practical problem of kernel upstreaming being a much more arduous road (which can be overcome), the bigger problem was that there is no standardization in the configuration interfaces for the NICs in the kernel community. So different drivers do things differently and expose different settings, and no forum exists to drive towards such standardization. This was leading to vendors have to maintain patched versions of drivers for doing PF configuration, which is not a desirable situation.

So, to build a portable (to multiple NICs) SRIOV VF manager like VFd, DPDK seemed like a good a forum with some hope for driving towards a standard set of interfaces and without having to worry about a lot of legacy baggage and old hardware. Especially since DPDK already takes on the role of configuring NICs for the data plane functions anyway - both PF and VF drivers will have to be included for data plane usage anyway - we viewed that adding VF config options will not cause any forking, but simply flush out the DPDK drivers and their interfaces to be more complete. These APIs could be optional, so new vendors aren’t obligated to add them.

Furthermore, allowing VF config using the DPDK PF driver also has the side benefit of allowing a complete SRIOV system (both VF and PF) to be built entirely with DPDK, also making version alignment easier.

We started with Niantic, which already had PF and VF drivers, and things have worked out very well with it. However, we would like VFd to be a multi-NIC vendor agnostic VF management tool, which is why we’ve been asking for making the PF config APIs richer.



On Jan 10, 2017, at 3:23 PM, Vincent Jardin <vincent.jardin at 6wind.com<mailto:vincent.jardin at 6wind.com>> wrote:

Nope. First one needs to assess if DPDK should be intensively used to become a PF knowing Linux can do the jobs. Linux kernel community does not like the forking of Kernel drivers, I tend to agree that we should not keep duplicating options that can be solved with the Linux kernel.

Best regards,

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