netdev - Re: [PATCH v2 2/2] macvtap: Implement multiqueue macvtap driver

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Message-Id: <201008021752.28475.arnd@arndb.de>
Date:	Mon, 2 Aug 2010 17:52:28 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Krishna Kumar <krkumar2@...ibm.com>
Cc:	davem@...emloft.net, bhutchings@...arflare.com,
	netdev@...r.kernel.org, mst@...hat.com, therbert@...gle.com
Subject: Re: [PATCH v2 2/2] macvtap: Implement multiqueue macvtap driver

On Monday 02 August 2010, Krishna Kumar wrote:
> Implement multiqueue facility for macvtap driver. The idea is that
> a macvtap device can be opened multiple times and the fd's can be
> used to register eg, as backend for vhost.
>
> Please review.

Only two very minor points from my side:

> diff -ruNp org/include/linux/netdevice.h new/include/linux/netdevice.h
> --- org/include/linux/netdevice.h	2010-07-25 16:57:07.000000000 +0530
> +++ new/include/linux/netdevice.h	2010-08-02 16:05:57.000000000 +0530
> @@ -2253,6 +2253,7 @@ static inline const char *netdev_name(co
>  	return dev->name;
>  }
>  
> +extern int skb_calculate_flow(struct net_device *dev, struct sk_buff *skb);
>  extern int netdev_printk(const char *level, const struct net_device *dev,
>  			 const char *format, ...)
>  	__attribute__ ((format (printf, 3, 4)));

This logically belongs into the first patch.

> diff -ruNp org/include/linux/if_macvlan.h new/include/linux/if_macvlan.h
> --- org/include/linux/if_macvlan.h	2010-08-02 15:32:33.000000000 +0530
> +++ new/include/linux/if_macvlan.h	2010-08-02 15:32:33.000000000 +0530
> @@ -40,6 +40,14 @@ struct macvlan_rx_stats {
>  	unsigned long		rx_errors;
>  };
>  
> +#define MIN(x, y)		(((x) < (y)) ? (x) : (y))
> +
> +/*
> + * Maximum times a macvtap device can be opened. This can be used to
> + * configure the number of receive queue, e.g. for multiqueue virtio.
> + */
> +#define MAX_MACVTAP_QUEUES	MIN(16, NR_CPUS)
> +

Please use the existing min() or min_t() macro instead of providing your own.

	Arnd
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