IB/mlx5: Fix binary compatibility with libmlx5
Commit c1be5232d21d ("Fix micro UAR allocator") broke binary compatibility
between libmlx5 and mlx5_ib since it defines a different value to the number
of micro UARs per page, leading to wrong calculation in libmlx5. This patch
defines struct mlx5_ib_alloc_ucontext_req_v2 as an extension to struct
mlx5_ib_alloc_ucontext_req. The extended size is determined in mlx5_ib_alloc_ucontext()
and in case of old library we use uuarn 0 which works fine -- this is
acheived due to create_user_qp() falling back from high to medium then to
low class where low class will return 0. For new libraries we use the
more sophisticated allocation algorithm.
Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index 492dc33..091576a 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -430,11 +430,17 @@
break;
case MLX5_IB_LATENCY_CLASS_MEDIUM:
- uuarn = alloc_med_class_uuar(uuari);
+ if (uuari->ver < 2)
+ uuarn = -ENOMEM;
+ else
+ uuarn = alloc_med_class_uuar(uuari);
break;
case MLX5_IB_LATENCY_CLASS_HIGH:
- uuarn = alloc_high_class_uuar(uuari);
+ if (uuari->ver < 2)
+ uuarn = -ENOMEM;
+ else
+ uuarn = alloc_high_class_uuar(uuari);
break;
case MLX5_IB_LATENCY_CLASS_FAST_PATH: