netdev - Re: [patch net-next 1/4] netdevice: add SW statistics ndo

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Date:	Tue, 17 May 2016 10:41:45 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, nogahf@...lanox.com,
	idosch@...lanox.com, eladr@...lanox.com, yotamg@...lanox.com,
	ogerlitz@...lanox.com, roopa@...ulusnetworks.com,
	nikolay@...ulusnetworks.com, linville@...driver.com,
	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 1/4] netdevice: add SW statistics ndo

Tue, May 17, 2016 at 10:39:08AM CEST, tgraf@...g.ch wrote:
>On 05/12/16 at 01:48pm, Jiri Pirko wrote:
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index 12436d1..a69e418 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -7376,6 +7376,8 @@ EXPORT_SYMBOL(netdev_stats_to_stats64);
>>   *	The device driver may provide its own method by setting
>>   *	dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
>>   *	otherwise the internal statistics structure is used.
>> + *	If device supports both HW & SW statistics - this function should
>> + *	return the HW statistics.
>>   */
>>  struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
>>  					struct rtnl_link_stats64 *storage)
>
>Can we clarify in a comment that given HW stats are available whether this
>would continue to account for something like a memory allocation failure
>through tx_dropped (for drivers which do skb_realloc_headroom() in xmit)
>or tx_busy for when the ring is busy? HW would never see such failures Is
>the expectation that dev_get_stats() continues to include these software
>failures?

I think it makes sense to merge HW counters with the kernel error counters
you mention. We'll fix that. Thanks.