IB/mlx5: Verify that Q counters are supported

Make sure that the Q counters are supported by the FW before trying
to allocate/deallocte them, this will avoid driver load failure when
they aren't supported by the FW.

Fixes: 0837e86a7a34 ('IB/mlx5: Add per port counters')
Cc: <stable@vger.kernel.org> # v4.7+
Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index a191b9327b0c1d5de95529e7395f1635547a46d6..0187f1d7234a71ae76f62c69f19cad530b77fdcd 100644 (file)
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -3313,9 +3313,11 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
        if (err)
                goto err_rsrc;
 
-       err = mlx5_ib_alloc_q_counters(dev);
-       if (err)
-               goto err_odp;
+       if (MLX5_CAP_GEN(dev->mdev, max_qp_cnt)) {
+               err = mlx5_ib_alloc_q_counters(dev);
+               if (err)
+                       goto err_odp;
+       }
 
        dev->mdev->priv.uar = mlx5_get_uars_page(dev->mdev);
        if (!dev->mdev->priv.uar)
@@ -3364,7 +3366,8 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
        mlx5_put_uars_page(dev->mdev, dev->mdev->priv.uar);
 
 err_q_cnt:
-       mlx5_ib_dealloc_q_counters(dev);
+       if (MLX5_CAP_GEN(dev->mdev, max_qp_cnt))
+               mlx5_ib_dealloc_q_counters(dev);
 
 err_odp:
        mlx5_ib_odp_remove_one(dev);
@@ -3397,7 +3400,8 @@ static void mlx5_ib_remove(struct mlx5_core_dev *mdev, void *context)
        mlx5_free_bfreg(dev->mdev, &dev->fp_bfreg);
        mlx5_free_bfreg(dev->mdev, &dev->bfreg);
        mlx5_put_uars_page(dev->mdev, mdev->priv.uar);
-       mlx5_ib_dealloc_q_counters(dev);
+       if (MLX5_CAP_GEN(dev->mdev, max_qp_cnt))
+               mlx5_ib_dealloc_q_counters(dev);
        destroy_umrc_res(dev);
        mlx5_ib_odp_remove_one(dev);
        destroy_dev_resources(&dev->devr);