mlx4 devices (ConnectX-2, ConnectX-3) can not issue
max_sge in a single RDMA_READ request (resulting in
a completion error). Thus, expose lower max_sge_rd
to avoid this issue.
Signed-off-by: Sagi Grimberg <sa...@mellanox.com>
---
drivers/infiniband/hw/mlx4/main.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/infiniband/hw/mlx4/main.c
b/drivers/infiniband/hw/mlx4/main.c
index 3889723..46305dc 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -499,7 +499,8 @@ static int mlx4_ib_init_device_flags(struct ib_device
*ibdev)
ibdev->max_qp_wr = dev->dev->caps.max_wqes -
MLX4_IB_SQ_MAX_SPARE;
ibdev->max_sge = min(dev->dev->caps.max_sq_sg,
dev->dev->caps.max_rq_sg);
- ibdev->max_sge_rd = ibdev->max_sge;
+ /* reserve 2 sge slots for rdma reads */
+ ibdev->max_sge_rd = ibdev->max_sge - 2;
ibdev->max_cq = dev->dev->quotas.cq;
ibdev->max_cqe = dev->dev->caps.max_cqes;
ibdev->max_mr = dev->dev->quotas.mpt;
--
1.7.1
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