Re: [dpdk-users] Support for more RSS hash types in vmxnet3

[Iain Barker <iain.barker@oracle.com>]

On 8/21/2018 6:57 PM, Jay Miller wrote:
> It's clear that the vmxnet3 driver (even as of 18.08) supports just a 
> subset of RSS hash types:
> 
> #define VMXNET3_RSS_OFFLOAD_ALL ( \
>      ETH_RSS_IPV4 | \
>      ETH_RSS_NONFRAG_IPV4_TCP | \
>      ETH_RSS_IPV6 | \
>      ETH_RSS_NONFRAG_IPV6_TCP)
> 
> Are there plans to add support for other hash types (like 
> ETH_RSS_NONFRAG_IPV4_UDP), or is this an architectural limitation of 
> vmxnet3?


On August 22, 2018 at 2:55 AM, Ferruh Yigit wrote:
    
> Hi Yong,
>    
> Can you please double check if the driver reports all supported hash functions
> correctly.
>    
> On v18.08, the RSS hf request from application changed from best effort to
> strict requirement, meaning if an application request a hash function but driver
> doesn't report it as supported API will return an error, that is why it is
> important for PMD to report supported hf properly.
>    
> Thanks,
> ferruh


On September 13, 2018 6:44 PM, Yong Wang wrote:

> That's pretty much all the hash types supported by vmxnet3 by default up to version 3.  
> With version 4, UDP RSS will be supported but it's only supported on certain version of ESX.  
> Since v4 driver is not out yet, current VMXNET3_RSS_OFFLOAD_ALL should be good.



Ferruh/Yong,

I notice that ESXi 6.7 has been released for some months now with support for VMXNET3 version 4 including with RSS for UDP
https://docs.vmware.com/en/vSphere/6.7/solutions/vSphere-6.7.2cd6d2a77980cc623caa6062f3c89362/GUID-C500585C0560D28B71180A40A4767C57.html

I'm surprised this wasn't already present in DPDK 19.02 given how long 6.7 has been available already.

Is it just a matter of changing the definition of VMXNET3_RSS_OFFLOAD_ALL  in the PMD to support this, or are other changes required?

thanks.
Iain