netdev - Re: [patch net-next rfc 4/7] net: rtnetlink: put alternative names to getlink message

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Message-ID: <20190719205914.3fc786f6@cakuba>
Date:   Fri, 19 Jul 2019 20:59:14 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        sthemmin@...rosoft.com, dsahern@...il.com, dcbw@...hat.com,
        mkubecek@...e.cz, andrew@...n.ch, parav@...lanox.com,
        saeedm@...lanox.com, mlxsw@...lanox.com
Subject: Re: [patch net-next rfc 4/7] net: rtnetlink: put alternative names
 to getlink message

On Fri, 19 Jul 2019 13:00:26 +0200, Jiri Pirko wrote:
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 7a2010b16e10..f11a2367037d 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -980,6 +980,18 @@ static size_t rtnl_xdp_size(void)
>  	return xdp_size;
>  }
>  
> +static size_t rtnl_alt_ifname_list_size(const struct net_device *dev)
> +{
> +	struct netdev_name_node *name_node;
> +	size_t size = nla_total_size(0);
> +
> +	if (list_empty(&dev->name_node->list))
> +		return 0;

Nit: it would make the intent a tiny bit clearer if 

	size = nla_total_size(0);

was after this early return.

> +	list_for_each_entry(name_node, &dev->name_node->list, list)
> +		size += nla_total_size(ALTIFNAMSIZ);

Since we have the structure I wonder if it would be worthwhile to store
the exact size in it?

> +	return size;
> +}
> +