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@xxxxxxxxxxxx>
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/hw/mlx5/main.c | 2 ++
include/rdma/ib_verbs.h | 1 +
2 files changed, 3 insertions(+)
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index b6588cdef1cf..7b48aeafef9e 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1008,6 +1008,8 @@ 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);
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 0a1713b86398..6e30ca4f1ef5 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -401,6 +401,7 @@ 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;
--
2.16.3
