netdev - Re: [PATCH net-next v3 4/5] net-sysfs: add support for device-specific rx queue sysfs attributes

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Date:	Thu, 16 Jan 2014 18:57:30 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Michael Dalton <mwdalton@...gle.com>
CC:	"David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
	"Eric Dumazet" <edumazet@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH net-next v3 4/5] net-sysfs: add support for
 device-specific rx queue sysfs attributes

On Thu, 2014-01-16 at 01:38 -0800, Michael Dalton wrote:
[...]
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
[...]
> @@ -2401,6 +2416,23 @@ static inline int netif_copy_real_num_queues(struct net_device *to_dev,
>  #endif
>  }
>  
> +#ifdef CONFIG_SYSFS
> +static inline unsigned int get_netdev_rx_queue_index(
> +		struct netdev_rx_queue *queue)
> +{
> +	struct net_device *dev = queue->dev;
> +	int i;
> +
> +	for (i = 0; i < dev->num_rx_queues; i++)
> +		if (queue == &dev->_rx[i])
> +			break;

Why write a loop when you can do:
	i = queue - dev->_rx;

Ben.

> +	BUG_ON(i >= dev->num_rx_queues);
> +
> +	return i;
> +}
> +#endif

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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