On Fri, 2013-12-27 at 07:48 -0800, Eric Dumazet wrote:
> On Fri, 2013-12-27 at 14:49 +0800, Ding Tianhong wrote:
> > Use possibly more efficient ether_addr_equal
> > to instead of memcmp.
[]
> > diff --git a/drivers/net/plip/plip.c b/drivers/net/plip/plip.c
[]
> > @@ -549,7 +549,7 @@ static __be16 plip_type_trans(struct sk_buff *skb,
> > struct net_device *dev)
> >
> > if(*eth->h_dest&1)
> > {
> > - if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
> > + if(ether_addr_equal(eth->h_dest, dev->broadcast))
> > skb->pkt_type=PACKET_BROADCAST;
> > else
> > skb->pkt_type=PACKET_MULTICAST;
>
> What about :
>
> if (is_multicast_ether_addr(eth->h_dest)) {
> if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
> skb->pkt_type = PACKET_BROADCAST;
> else
> skb->pkt_type = PACKET_MULTICAST;
> }
That is better though I wonder how many systems are
still using laplink via parallel null-printer cables.
No matter, better is better.
The same optimization using ether_addr_equal_64bits
may be possible to do in other places given other
structs too.
Perhaps it's a possible spatch/coccinelle conversion,
I don't know spatch well enough to know if a
mechanism to check if structure members have other
fields that follow them in the structure or if the
structure member is an array of a minimum size.
Maybe Julia does. (cc'd)
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