On Fri, Sep 04, 2020 at 01:06:21PM -0700, Jakub Kicinski wrote:
> Even tho mlx4_core registers the devlink ports, it's mlx4_en
> and mlx4_ib which set their type. In situations where one of
> the two is not built yet the machine has ports of given type
> we see the devlink warning from devlink_port_type_warn() trigger.
>
> Having ports of a type not supported by the kernel may seem
> surprising, but it does occur in practice - when the unsupported
> port is not plugged in to a switch anyway users are more than happy
> not to see it (and potentially allocate any resources to it).
>
> Set the type in mlx4_core if type-specific driver is not built.
>
> Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
> ---
> drivers/net/ethernet/mellanox/mlx4/main.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
> index 258c7a96f269..70cf24ba71e4 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/main.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/main.c
> @@ -3031,6 +3031,17 @@ static int mlx4_init_port_info(struct mlx4_dev *dev, int port)
> if (err)
> return err;
>
> + /* Ethernet and IB drivers will normally set the port type,
> + * but if they are not built set the type now to prevent
> + * devlink_port_type_warn() from firing.
> + */
> + if (!IS_ENABLED(CONFIG_MLX4_EN) &&
> + dev->caps.port_type[port] == MLX4_PORT_TYPE_ETH)
> + devlink_port_type_eth_set(&info->devlink_port, NULL);
^^^^^
Won't it crash in devlink_port_type_eth_set()?
The first line there dereferences pointer.
7612 const struct net_device_ops *ops = netdev->netdev_ops;
And can we call to devlink_port_type_*_set() without IS_ENABLED() check?
Thanks
> + else if (!IS_ENABLED(CONFIG_MLX4_INFINIBAND) &&
> + dev->caps.port_type[port] == MLX4_PORT_TYPE_IB)
> + devlink_port_type_ib_set(&info->devlink_port, NULL);
> +
> info->dev = dev;
> info->port = port;
> if (!mlx4_is_slave(dev)) {
> --
> 2.26.2
>
