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RDMA/mlx4: Ensure that maximal send/receive SGE less than supported by HW 

In calculating the global maximum number of the Scatter/Gather elements
supported, the following four maximum parameters must be taken into
consideration: max_sg_rq, max_sg_sq, max_desc_sz_rq and max_desc_sz_sq.

However instead of bringing this complexity to query_device, which still
won't be sufficient anyway (the calculations are dependent on QP type),
the safer approach will be to restore old code, which will give us 32
SGEs.

Fixes: 33023fb85a ("IB/core: add max_send_sge and max_recv_sge attributes")
Reported-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Leon Romanovsky 2018-09-03 09:11:14 +03:00 committed by Jason Gunthorpe
parent 954a8e3aea
commit 8f28b178f7
1 changed files with 5 additions and 3 deletions
drivers/infiniband/hw/mlx4
main.c

8
drivers/infiniband/hw/mlx4/main.c
View File

@ -517,9 +517,11 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
props->page_size_cap = dev->dev->caps.page_size_cap;
props->max_qp = dev->dev->quotas.qp;
props->max_qp_wr = dev->dev->caps.max_wqes - MLX4_IB_SQ_MAX_SPARE;
props->max_send_sge = dev->dev->caps.max_sq_sg;
props->max_recv_sge = dev->dev->caps.max_rq_sg;
props->max_sge_rd = MLX4_MAX_SGE_RD;
props->max_send_sge =
min(dev->dev->caps.max_sq_sg, dev->dev->caps.max_rq_sg);
props->max_recv_sge =
min(dev->dev->caps.max_sq_sg, dev->dev->caps.max_rq_sg);
props->max_sge_rd = MLX4_MAX_SGE_RD;
props->max_cq = dev->dev->quotas.cq;
props->max_cqe = dev->dev->caps.max_cqes;
props->max_mr = dev->dev->quotas.mpt;