netdev - Re: [PATCH net-next v2 3/5] devlink: create a special NDO for getting the devlink instance

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Date:   Fri, 22 Feb 2019 12:04:07 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>, davem@...emloft.net,
        jiri@...nulli.us
Cc:     mkubecek@...e.cz, andrew@...n.ch, netdev@...r.kernel.org,
        oss-drivers@...ronome.com
Subject: Re: [PATCH net-next v2 3/5] devlink: create a special NDO for getting
 the devlink instance

On 2/22/19 11:54 AM, Jakub Kicinski wrote:
> Instead of iterating over all devlink ports add a NDO which
> will return the devlink instance from the driver.
> 
> v2: add the netdev_to_devlink() helper (Michal)
> 
> Suggested-by: Jiri Pirko <jiri@...nulli.us>
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> ---
[snip]

> -	mutex_unlock(&devlink_mutex);
> +	devlink = netdev_to_devlink(dev);
> +	if (!devlink || !devlink->ops->info_get)
> +		return;

AFAICT devlink_create() allows one to specify a NULL ops argument (not
that this makes sense), so probably need to add a check against
devlink->ops here as well, unless we want to change devlink_create() to
refuse a NULL ops pointer.

Other than that:

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

> +
> +	mutex_lock(&devlink->lock);
> +	__devlink_compat_running_version(devlink, buf, len);
> +	mutex_unlock(&devlink->lock);
>  }
>  
>  int devlink_compat_flash_update(struct net_device *dev, const char *file_name)
>  {
> -	struct devlink_port *devlink_port;
>  	struct devlink *devlink;
> +	int ret;
>  
> -	mutex_lock(&devlink_mutex);
> -	list_for_each_entry(devlink, &devlink_list, list) {
> -		mutex_lock(&devlink->lock);
> -		list_for_each_entry(devlink_port, &devlink->port_list, list) {
> -			int ret = -EOPNOTSUPP;
> -
> -			if (devlink_port->type != DEVLINK_PORT_TYPE_ETH ||
> -			    devlink_port->type_dev != dev)
> -				continue;
> -
> -			mutex_unlock(&devlink_mutex);
> -			if (devlink->ops->flash_update)
> -				ret = devlink->ops->flash_update(devlink,
> -								 file_name,
> -								 NULL, NULL);
> -			mutex_unlock(&devlink->lock);
> -			return ret;
> -		}
> -		mutex_unlock(&devlink->lock);
> -	}
> -	mutex_unlock(&devlink_mutex);
> +	devlink = netdev_to_devlink(dev);
> +	if (!devlink || !devlink->ops->flash_update)
> +		return -EOPNOTSUPP;
>  

And same here.
-- 
Florian