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With this new criteria, QPs have different PIDs will be bound to
different counters in auto mode. This can be used in combination with
other criteria like "type". Examples:

$ rdma statistic qp set link mlx5_2/1 auto pid on
$ rdma statistic qp set link mlx5_2/1 auto type,pid on
$ rdma statistic qp set link mlx5_2/1 auto off
$ rdma statistic qp show link mlx5_0 qp-type UD
Signed-off-by: Mark Zhang <markz@mellanox.com>
Reviewed-by: Ido Kalir <idok@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: David Ahern <dsahern@kernel.org>