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

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Message-ID: <20160517083908.GA13823@pox.localdomain>
Date:	Tue, 17 May 2016 10:39:08 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Jiri Pirko <jiri@...nulli.us>
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

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?