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RDMA/mlx5: Add attr for max number page list length for PI operation

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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>
This commit is contained in:
Max Gurtovoy 2019-06-11 18:52:43 +03:00 committed by Jason Gunthorpe
parent 6c984472ba
commit 62e3c379d4
2 changed files with 3 additions and 0 deletions
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2
drivers/infiniband/hw/mlx5/main.c
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@ -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);

1
include/rdma/ib_verbs.h
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@ -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;