hinic: add support to query rq info
add debugfs node for querying rq info, for example: cat /sys/kernel/debug/hinic/0000:15:00.0/RQs/0x0/rq_hw_pi Signed-off-by: Luo bin <luobin9@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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