[dpdk-stable] please help backporting some patches to stable release 19.11.7

[Lance Richardson]

I have posted these:

  73d1cc96be  Lance Richardson net/bnxt: fix doorbell write ordering
  c86e930165  Lance Richardson net/bnxt: fix fallback mbuf allocation logic
  e750acef45  Lance Richardson net/bnxt: fix outer UDP checksum Rx
offload capability

These are dependent on a number of changes that are only present in
20.11 and later, I don't think they are good candidates for back-porting:

  d5bbd72246  Lance Richardson net/bnxt: make offload flags mapping per-ring
  48a580c5df  Lance Richardson net/bnxt: set correct checksum status in mbuf