If we're not running with multiqueue enabled we need to wait to acquire the rspq lock. Not doing so was causing us to skip re-enabling the interrupt.
If we're not running with multiqueue enabled we need to wait to acquire the
rspq lock. Not doing so was causing us to skip re-enabling the interrupt.

- remove duplicate credits sysctl
- add support for dumping hardware context of the txq
- decrement budget_left when we break out of the process_responses loop

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