linux-kernel - Re: [PATCH net] devlink: Fix devlink_param_driverinit_value

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Date:   Tue, 4 Sep 2018 10:13:52 -0600
From:   David Ahern <dsahern@...il.com>
To:     Moshe Shemesh <moshe@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] devlink: Fix devlink_param_driverinit_value_set()
 stub return code

On 9/4/18 7:04 AM, Moshe Shemesh wrote:
> The stub function returned -EOPNOTSUPP while CONFIG_NET_DEVLINK is off.
> It caused false warning during driver load. Driver needs to update
> devlink on a parameter value if devlink module is there, if not it
> doesn't need any error code.
> 
> Fixes: ec01aeb1803e ("devlink: Add support for get/set driverinit value")
> Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
> Acked-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  include/net/devlink.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/net/devlink.h b/include/net/devlink.h
> index b9b89d6..b467357 100644
> --- a/include/net/devlink.h
> +++ b/include/net/devlink.h
> @@ -781,7 +781,7 @@ static inline bool devlink_dpipe_table_counter_enabled(struct devlink *devlink,
>  devlink_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
>  				   union devlink_param_value init_val)
>  {
> -	return -EOPNOTSUPP;
> +	return 0;
>  }
>  
>  static inline void
> 

This should be handled by the driver -- check for -EOPNOTSUPP and not
log an error.

devlink is generic infrastructure. If a call is made and the operation
is not supported, then devlink should return an error.