Merge branch 'nfp-update-TX-path-to-enable-repr-offloads'

Jakub Kicinski says:

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nfp: update TX path to enable repr offloads

This set starts with three micro optimizations to the TX path.
The improvement is measurable, but below 1% of CPU utilization.

Patches 4 - 9 add basic TX offloads to representor devices, like
checksum offload or TSO, and remove the unnecessary TX lock and
Qdisc (our representors are software constructs on top of the PF).

The last 2 patches add more info to error messages - id of command
which failed and exact location of incorrect TLVs, very useful for
debugging.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>