netdev - Re: [patch net-next 3/4] net: core: add SW stats to if_stats

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Date:	Thu, 12 May 2016 13:44:05 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Cc:	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
Subject: Re: [patch net-next 3/4] net: core: add SW stats to if_stats_msg

Thu, May 12, 2016 at 01:33:11PM CEST, nikolay@...ulusnetworks.com wrote:
>
>> On May 12, 2016, at 12:59 PM, Jiri Pirko <jiri@...nulli.us> wrote:
>> 
>> From: Nogah Frankel <nogahf@...lanox.com>
>> 
>> If there is a dedicated ndo to return SW stats - use
>> it. Otherwise (indicates that there is no HW stats) use
>> the default stats ndo.
>> Return results under IFLA_STATS_LINK_SW_64.
>> 
>> Signed-off-by: Nogah Frankel <nogahf@...lanox.com>
>> Reviewed-by: Ido Schimmel <idosch@...lanox.com>
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>> ---
>> include/uapi/linux/if_link.h |  1 +
>> net/core/rtnetlink.c         | 35 +++++++++++++++++++++++++++++------
>> 2 files changed, 30 insertions(+), 6 deletions(-)
>> 
>> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
>> index 98175e7..fcfb944 100644
>> --- a/include/uapi/linux/if_link.h
>> +++ b/include/uapi/linux/if_link.h
>> @@ -823,6 +823,7 @@ enum {
>> 	IFLA_STATS_UNSPEC, /* also used as 64bit pad attribute */
>> 	IFLA_STATS_LINK_64,
>> 	IFLA_STATS_LINK_XSTATS,
>> +	IFLA_STATS_LINK_SW_64,
>> 	__IFLA_STATS_MAX,
>> };
>> 
>> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
>> index a127d67..f8b12e4 100644
>> --- a/net/core/rtnetlink.c
>> +++ b/net/core/rtnetlink.c
>> @@ -3481,6 +3481,9 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
>> 	struct nlmsghdr *nlh;
>> 	struct nlattr *attr;
>> 	int s_prividx = *prividx;
>> +	struct rtnl_link_stats64 *sp;
>> +	struct rtnl_link_stats64 *stats64_sp = 0;
>
>s/0/NULL/
>net/core//rtnetlink.c:3485:48: warning: Using plain integer as NULL pointer

Will fix and send v2. Thanks.


>
>> +	int err;
>> 
>> 	ASSERT_RTNL();
>> 
>> @@ -3493,24 +3496,20 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
>> 	ifsm->filter_mask = filter_mask;
>> 
>> 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
>> -		struct rtnl_link_stats64 *sp;
>> -
>> 		attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
>> 					 sizeof(struct rtnl_link_stats64),
>> 					 IFLA_STATS_UNSPEC);
>> 		if (!attr)
>> 			goto nla_put_failure;
>> 
>> -		sp = nla_data(attr);
>> -		dev_get_stats(dev, sp);
>> +		stats64_sp = nla_data(attr);
>> +		dev_get_stats(dev, stats64_sp);
>> 	}
>> 
>> 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
>> 		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
>> 
>> 		if (ops && ops->fill_linkxstats) {
>> -			int err;
>> -
>> 			*idxattr = IFLA_STATS_LINK_XSTATS;
>> 			attr = nla_nest_start(skb,
>> 					      IFLA_STATS_LINK_XSTATS);
>> @@ -3525,6 +3524,27 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
>> 		}
>> 	}
>> 
>> +	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_SW_64, *idxattr)) {
>> +		attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_SW_64,
>> +					 sizeof(struct rtnl_link_stats64),
>> +					 IFLA_STATS_UNSPEC);
>> +		if (!attr)
>> +			goto nla_put_failure;
>> +
>> +		sp = nla_data(attr);
>> +		err = dev_get_sw_stats(dev, sp);
>> +		if (err) {
>> +			/* if err it means there is no dedicated ndo to
>> +			 * get SW stats - so it is returned by the default
>> +			 * stats ndo
>> +			 */
>> +			if (stats64_sp)
>> +				copy_rtnl_link_stats64(sp, stats64_sp);
>> +			else
>> +				dev_get_stats(dev, sp);
>> +		}
>> +	}
>> +
>> 	nlmsg_end(skb, nlh);
>> 
>> 	return 0;
>> @@ -3541,6 +3561,7 @@ nla_put_failure:
>> 
>> static const struct nla_policy ifla_stats_policy[IFLA_STATS_MAX + 1] = {
>> 	[IFLA_STATS_LINK_64]	= { .len = sizeof(struct rtnl_link_stats64) },
>> +	[IFLA_STATS_LINK_SW_64] = { .len = sizeof(struct rtnl_link_stats64) },
>> };
>> 
>> static size_t if_nlmsg_stats_size(const struct net_device *dev,
>> @@ -3550,6 +3571,8 @@ static size_t if_nlmsg_stats_size(const struct net_device *dev,
>> 
>> 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
>> 		size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
>> +	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_SW_64, 0))
>> +		size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
>> 
>> 	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
>> 		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
>> -- 
>> 2.5.5
>> 
>