[Bug 203445] Receive side scaling (RSS) for more than 16 queues not working in "ixl" driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203445

            Bug ID: 203445
           Summary: Receive side scaling (RSS) for more than 16 queues not
                    working in "ixl" driver
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tushar.swain at gmail.com

Issue -

Receive side scaling (RSS) for more than 16 queues not working in "ixl" driver.

Version:
The FreeBSD driver version is 1.4.1 

Description:

My system has 20 CPU cores. The packet-processing application uses NIC RSS
feature to filter packets to dedicated receive queues for each core.

NIC is able to do RSS properly for Queue-0 to Queue-15, and packets reach the
right receive queues. 

But not a single packet reach Queue-16/17/18/19. 

Instead Packets for Queue-16/17/18/18 reach Queue-0/1/2/3 

Possibly some RSS specific register settings missing in the drivers that
restricts NIC from using more than 16 receive queues

Linux driver doesn't seem to exhibit this behavior.

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