netdev - Re: [RFC 03/14] net: hstats: add basic/core functionality

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Date:   Tue, 29 Jan 2019 21:18:28 -0700
From:   David Ahern <dsahern@...il.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>, davem@...emloft.net
Cc:     oss-drivers@...ronome.com, netdev@...r.kernel.org,
        jiri@...nulli.us, f.fainelli@...il.com, andrew@...n.ch,
        mkubecek@...e.cz, simon.horman@...ronome.com,
        jesse.brandeburg@...el.com, maciejromanfijalkowski@...il.com,
        vasundhara-v.volam@...adcom.com, michael.chan@...adcom.com,
        shalomt@...lanox.com, idosch@...lanox.com
Subject: Re: [RFC 03/14] net: hstats: add basic/core functionality

On 1/28/19 4:44 PM, Jakub Kicinski wrote:
> @@ -4946,6 +4964,9 @@ static size_t if_nlmsg_stats_size(const struct net_device *dev,
>  		rcu_read_unlock();
>  	}
>  
> +	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_HSTATS, 0))

filter_mask is populated by RTEXT_FILTER_ from
include/uapi/linux/rtnetlink.h

> +		size += rtnl_get_link_hstats_size(dev);

rtnl_get_link_hstats_size == __rtnl_get_link_hstats can return < 0.

> +
>  	return size;
>  }
>  
>