Issue in testpmd when using RSS Flows with Mellanox NICs

[Alex Chapman <alex.chapman@arm.com>]

Hello maintainers,

I am currently facing issues when creating RSS flows using testpmd.
When using the following flow on an intel NIC, it works as expected,
using the reta table to redirect ipv4-udp packets to the correct queue.

        flow create 0 ingress pattern eth / ipv4 / udp / end actions rss types
ipv4-udp end queues end func toeplitz / end

However when executing the same command on a Mellanox NIC, the following
error occurs.

     Caught PMD error type 15 (action configuration): No queues
configured: Invalid argument

This error can be resolved by manually specifying the queues used:

     flow create 0 ingress pattern eth / ipv4 / udp / end actions rss
types ipv4-udp end queues 0 1 2 3 4 5 6 7 8 end func toeplitz / end

However the packets are not placed into their expected queues using the
reta table.

When looking through the Generic flow API guide under RSS
(https://doc.dpdk.org/guides/prog_guide/rte_flow.html), the attribute
queues does not exist.
 From my understanding this seems to be a mistake, as the attribute
"queue" does exist with the definition "queue indices to use"
However when attempting to use this attribute I get the error "Bad
arguments"

If anyone is able to shed some light on the use of RSS in flows, that
would be greatly appreciated.

Thanks,
Alex
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