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

[Ferruh Yigit <ferruh.yigit@intel.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?

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

> 
> The documentation could be more explicit about these limitations:
> 
>>>
>>>     36.2. Features and Limitations of VMXNET3 PMD
>>>
>>> In release 1.6.0, the VMXNET3 PMD provides the basic functionality of 
>>> packet reception and transmission. There are several options 
>>> available for filtering packets at VMXNET3 device level including:
>>>
>>>  1. *MAC Address based filtering*:
>>>       * Unicast, Broadcast, All Multicast modes - SUPPORTED BY DEFAULT
>>>       * Multicast with Multicast Filter table - NOT SUPPORTED
>>>       * Promiscuous mode - SUPPORTED
>>>       * *RSS based load balancing between queues - SUPPORTED*
>>>
>>
> 
> Thanks,
> J
>