Added num_outstanding_reqs in struct spdk_nvme_qpair to record outstanding
req number in each qpair. This can be used by multipath to select I/O
path.
Increment num_outstaning_reqs when req is removed from free_req queue and
decrement it when req is put back in free_req queue.
Change-Id: I31148fc7d0a9a85bec4c56d1f6e3047b021c2f48
Signed-off-by: Richael Zhuang <richael.zhuang@arm.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/15875
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com>
Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
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