Navdeep Parhar 3447df8bc5 cxgbe(4): Fixes to tx coalescing.
- The behavior implemented in r362905 resulted in delayed transmission
  of packets in some cases, causing performance issues.  Use a different
  heuristic to predict tx requests.

- Add a tunable/sysctl (hw.cxgbe.tx_coalesce) to disable tx coalescing
  entirely.  It can be changed at any time.  There is no change in
  default behavior.
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