IB/mlx5: Fix RC transport send queue overhead computation

Fix the RC QPs send queue overhead computation to take into account
two additional segments in the WQE which are needed for registration
operations.

The ATOMIC and UMR segments can't coexist together, so chose maximum out
of them.

The commit 9e65dc371b5c ("IB/mlx5: Fix RC transport send queue overhead
computation") was intended to update RC transport as commit messages
states, but added the code to UC transport.

Fixes: 9e65dc371b5c ("IB/mlx5: Fix RC transport send queue overhead computation")
Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index 9116bc3988a6f9338709f6120a4597794d2cf36d..34cb8e87c7b8b673493285f807206c437ac42a84 100644 (file)
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -270,8 +270,10 @@ static int sq_overhead(enum ib_qp_type qp_type)
                /* fall through */
        case IB_QPT_RC:
                size += sizeof(struct mlx5_wqe_ctrl_seg) +
-                       sizeof(struct mlx5_wqe_atomic_seg) +
-                       sizeof(struct mlx5_wqe_raddr_seg);
+                       max(sizeof(struct mlx5_wqe_atomic_seg) +
+                           sizeof(struct mlx5_wqe_raddr_seg),
+                           sizeof(struct mlx5_wqe_umr_ctrl_seg) +
+                           sizeof(struct mlx5_mkey_seg));
                break;
 
        case IB_QPT_XRC_TGT:
@@ -279,9 +281,9 @@ static int sq_overhead(enum ib_qp_type qp_type)
 
        case IB_QPT_UC:
                size += sizeof(struct mlx5_wqe_ctrl_seg) +
-                       sizeof(struct mlx5_wqe_raddr_seg) +
-                       sizeof(struct mlx5_wqe_umr_ctrl_seg) +
-                       sizeof(struct mlx5_mkey_seg);
+                       max(sizeof(struct mlx5_wqe_raddr_seg),
+                           sizeof(struct mlx5_wqe_umr_ctrl_seg) +
+                           sizeof(struct mlx5_mkey_seg));
                break;
 
        case IB_QPT_UD: