RDMA/mlx5: Add attr for max number page list length for PI operation
PI offload (protection information) is a feature that each RDMA provider can implement differently. Thus, introduce new device attribute to define the maximal length of the page list for PI fast registration operation. For example, mlx5 driver uses a single internal MR to map both data and protection SGL's, so it's equal to max_fast_reg_page_list_len / 2. Signed-off-by: NMax Gurtovoy <maxg@mellanox.com> Reviewed-by: NLeon Romanovsky <leonro@mellanox.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>
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