mlx5: Use valid qp type to determine wqe buffer allocation type

The library has env based setup (e.g HUGE_RC=y, etc) for the user to
provide directives/hints re how to allocate the WQE buffer per qp type.

Currently, the ibv qp instance is used for that, however, it's qp type
field is not initialized at the time mlx5_alloc_qp_buf is called.

As a result, the user hint/directive is ignored.

To fix that, pick the qp type from the provided attributes.

Note: this commit refers to the compatibility mode per QP type. The
default mode (i.e. MLX_QP_ALLOC_TYPE) which refers to all QP types,
works fine.

Signed-off-by: Or Gerlitz <ogerlitz@nvidia.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>

providers/mlx5/verbs.c

@@ -1893,7 +1893,7 @@ static int mlx5_alloc_qp_buf(struct ibv_context *context,
 	}
 
 	/* compatibility support */
-	qp_huge_key  = qptype2key(qp->ibv_qp->qp_type);
+	qp_huge_key = qptype2key(attr->qp_type);
 	if (mlx5_use_huge(qp_huge_key))
 		default_alloc_type = MLX5_ALLOC_TYPE_HUGE;