netdev - Re: [patch net-next v9 2/3] net: core: Add offload stats to if_stats

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Message-Id: <6226A529-D83B-4B77-8091-E6E8528B0063@cumulusnetworks.com>
Date:   Fri, 16 Sep 2016 11:00:46 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>, nogahf@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>, eladr@...lanox.com,
        yotamg@...lanox.com, ogerlitz@...lanox.com,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        linville@...driver.com, tgraf@...g.ch,
        Andy Gospodarek <gospo@...ulusnetworks.com>, sfeldma@...il.com,
        sd@...asysnail.net, eranbe@...lanox.com, ast@...mgrid.com,
        edumazet@...gle.com, hannes@...essinduktion.org,
        f.fainelli@...il.com, dsa@...ulusnetworks.com
Subject: Re: [patch net-next v9 2/3] net: core: Add offload stats to if_stats_msg


> On Sep 14, 2016, at 12:28 PM, Jiri Pirko <jiri@...nulli.us> wrote:
> 
> From: Nogah Frankel <nogahf@...lanox.com>
> 
> Add a nested attribute of offload stats to if_stats_msg
> named IFLA_STATS_LINK_OFFLOAD_XSTATS.
> Under it, add SW stats, meaning stats only per packets that went via
> slowpath to the cpu, named IFLA_OFFLOAD_XSTATS_CPU_HIT.
> 
> Signed-off-by: Nogah Frankel <nogahf@...lanox.com>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
> include/uapi/linux/if_link.h |   9 ++++
> net/core/rtnetlink.c         | 111 +++++++++++++++++++++++++++++++++++++++++--
> 2 files changed, 116 insertions(+), 4 deletions(-)
> 
[snip]
> @@ -3655,6 +3737,24 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
> 		}
> 	}
> 
> +	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
> +			     *idxattr)) {
> +		*idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
> +		attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
> +		if (!attr)
> +			goto nla_put_failure;
> +
> +		err = rtnl_get_offload_stats(skb, dev, prividx);
> +		if (err == -ENODATA)
> +			nla_nest_cancel(skb, attr);
> +		else
> +			nla_nest_end(skb, attr);
> +
> +		if ((err) && (err != -ENODATA))
                       ^^^^       ^^^^^^^^^^^^^^^^^^
The extra braces are still there. [1]
The rest looks good to me.

Thanks,
 Nik

[1] http://www.spinics.net/lists/netdev/msg394257.html

> +			goto nla_put_failure;
> +		*idxattr = 0;
> +	}
> +
> 	nlmsg_end(skb, nlh);
> 
> 	return 0;
> @@ -3708,6 +3808,9 @@ static size_t if_nlmsg_stats_size(const struct net_device *dev,
> 		}
> 	}
> 
> +	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
> +		size += rtnl_get_offload_stats_size(dev);
> +
> 	return size;
> }
> 
> -- 
> 2.5.5
>