Full 32bit flowid from igb(4)

[hiren panchasara]

On 03/30/15 at 04:33P, Adrian Chadd wrote:
> So, the 32 bit field that has the flowid in the rx descriptor can mean
> multiple things - not just the flowid.
> 
> For igb it can also mean one of the RX checksums.

I care about igb(4) right now and I350 specifically. I checked the spec
and section 7.1.2.8 Receive-Side Scaling (RSS) which defines it.

In igb_initialise_rss_mapping(), we do set MRQC register which means we are
getting RSS hash in flowid. And we disable packet checksum to get RSS
type via PCSD register. 

Is my understanding not correct? I am missing how can we not get RSS hash
in flowid in this case. Can you please explain?

Cheers,
Hiren
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