nvmet-tcp: enable optional queue idle period tracking
Add 'idle_poll_period_usecs' option used by io_work() to support network devices enabled with advanced interrupt moderation supporting a relaxed interrupt model. It was discovered that such a NIC used on the target was unable to support initiator connection establishment, caused by the existing io_work() flow that immediately exits after a loop with no activity and does not re-queue itself. With this new option a queue is assigned a period of time that no activity must occur in order to become 'idle'. Until the queue is idle the work item is requeued. The new module option is defined as changeable making it flexible for testing purposes. The pre-existing legacy behavior is preserved when no module option for idle_poll_period_usecs is specified. Signed-off-by:Mark Wunderlich <mark.wunderlich@intel.com> Reviewed-by:
Sagi Grimberg <sagi@grimberg.me> Signed-off-by:
Christoph Hellwig <hch@lst.de>
parent
b5332a9f
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