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Add support for ib callback modify_op_stat() to add or remove an optional counter. When adding, a steering flow table is created with a rule that catches and counts all the matching packets. When removing, the table and flow counter are destroyed. Link: https://lore.kernel.org/r/20211008122439.166063-13-markzhang@nvidia.com Signed-off-by: Aharon Landau <aharonl@nvidia.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Mark Zhang <markzhang@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>