netdev - Re: [PATCH net-next 6/6] netdevsim: Add simple FIB resource controller via devlink

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Date:   Tue, 27 Mar 2018 18:34:50 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     David Ahern <dsa@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        roopa@...ulusnetworks.com, shm@...ulusnetworks.com,
        jiri@...lanox.com, idosch@...lanox.com, andy.roulin@...il.com
Subject: Re: [PATCH net-next 6/6] netdevsim: Add simple FIB resource
 controller via devlink

On Tue, 27 Mar 2018 18:22:00 -0700, David Ahern wrote:
> +void nsim_devlink_setup(struct netdevsim *ns)
> +{
> +	struct net *net = nsim_to_net(ns);
> +	bool *reg_devlink = net_generic(net, nsim_devlink_id);
> +	struct devlink *devlink;
> +	int err = -ENOMEM;
> +
> +	/* only one device per namespace controls devlink */
> +	if (!*reg_devlink) {
> +		ns->devlink = NULL;
> +		return;
> +	}
> +
> +	devlink = devlink_alloc(&nsim_devlink_ops, 0);
> +	if (!devlink)
> +		return;
> +
> +	err = devlink_register(devlink, &ns->dev);
> +	if (err)
> +		goto err_devlink_free;
> +
> +	err = devlink_resources_register(devlink);
> +	if (err)
> +		goto err_dl_unregister;
> +
> +	ns->devlink = devlink;
> +
> +	*reg_devlink = false;
> +
> +	return;
> +
> +err_dl_unregister:
> +	devlink_unregister(devlink);
> +err_devlink_free:
> +	devlink_free(devlink);
> +}

nit: DaveM expressed preference to not have silent failures in a
     discussion about DebugFS, not sure it applies here, but why not
     handle errors?