scsi: lpfc: Limit tracking of tgt queue depth in fast path
Performance is affected when target queue depth is tracked. An atomic counter is incremented on the submission path which competes with it being decremented on the completion path. In addition, multiple CPUs can simultaniously be manipulating this counter for the same ndlp. Reduce the overhead by only performing the target increment/decrement when the target queue depth is less than the overall adapter depth, thus is actually meaningful. Signed-off-by: NDick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: NJames Smart <james.smart@broadcom.com> Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
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