RDMA/mlx5: Add attr for max number page list length for PI operation (62e3c379) · Commits · 戴 / test

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:

Max Gurtovoy <maxg@mellanox.com> Reviewed-by:

Leon Romanovsky <leonro@mellanox.com> Reviewed-by:

Christoph Hellwig <hch@lst.de> Signed-off-by:

Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/main.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1009,6 +1009,8 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
		props->max_srq_sge = max_rq_sg - 1;
		props->max_fast_reg_page_list_len =
		1 << MLX5_CAP_GEN(mdev, log_max_klm_list_size);
		props->max_pi_fast_reg_page_list_len =
		props->max_fast_reg_page_list_len / 2;
		get_atomic_caps_qp(dev, props);
		props->masked_atomic_cap = IB_ATOMIC_NONE;
		props->max_mcast_grp = 1 << MLX5_CAP_GEN(mdev, log_max_mcg);

include/rdma/ib_verbs.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -390,6 +390,7 @@ struct ib_device_attr {
		int max_srq_wr;
		int max_srq_sge;
		unsigned int max_fast_reg_page_list_len;
		unsigned int max_pi_fast_reg_page_list_len;
		u16 max_pkeys;
		u8 local_ca_ack_delay;
		int sig_prot_cap;

Admin message