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net: introduce reciprocal_scale helper and convert users

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As David Laight suggests, we shouldn't necessarily call this
reciprocal_divide() when users didn't requested a reciprocal_value();
lets keep the basic idea and call it reciprocal_scale(). More
background information on this topic can be found in [1].

Joint work with Hannes Frederic Sowa.

  [1] http://homepage.cs.uiowa.edu/~jones/bcd/divide.html

Suggested-by: David Laight <[email protected]>
Cc: Jakub Zawadzki <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: [email protected]
Signed-off-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Daniel Borkmann 2014-01-22 02:29:40 +01:00 • committed by David S. Miller
commit 89770b0a69
3 changed files with 21 additions and 5 deletions
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3
net/packet/af_packet.c
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@ -88,7 +88,6 @@
#include <linux/virtio_net.h>
#include <linux/errqueue.h>
#include <linux/net_tstamp.h>
#include <linux/reciprocal_div.h>
#include <linux/percpu.h>
#ifdef CONFIG_INET
#include <net/inet_common.h>
@ -1262,7 +1261,7 @@ static unsigned int fanout_demux_hash(struct packet_fanout *f,
struct sk_buff *skb,
unsigned int num)
{
return reciprocal_divide(skb->rxhash, num);
return reciprocal_scale(skb->rxhash, num);
}
static unsigned int fanout_demux_lb(struct packet_fanout *f,