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etherdev: Process is_multicast_ether_addr at same size as other operations

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This change makes it so that we process the address in
is_multicast_ether_addr at the same size as the other calls.  This allows
us to avoid duplicate reads when used with other calls such as
is_zero_ether_addr or eth_addr_copy.  In addition I have added a 64 bit
version of the function so in eth_type_trans we can process the destination
address as a 64 bit value throughout.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
2015-04-30 14:53:54 -07:00
committed by David S. Miller
parent 849b920e17
commit d54385ce68
2 changed files with 24 additions and 2 deletions
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24
include/linux/etherdevice.h
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@@ -110,7 +110,29 @@ static inline bool is_zero_ether_addr(const u8 *addr)
*/ */
static inline bool is_multicast_ether_addr(const u8 *addr) static inline bool is_multicast_ether_addr(const u8 *addr)
{ {
return 0x01 & addr[0]; #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
u32 a = *(const u32 *)addr;
#else
u16 a = *(const u16 *)addr;
#endif
#ifdef __BIG_ENDIAN
return 0x01 & (a >> ((sizeof(a) * 8) - 8));
#else
return 0x01 & a;
#endif
}
static inline bool is_multicast_ether_addr_64bits(const u8 addr[6+2])
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
#ifdef __BIG_ENDIAN
return 0x01 & ((*(const u64 *)addr) >> 56);
#else
return 0x01 & (*(const u64 *)addr);
#endif
#else
return is_multicast_ether_addr(addr);
#endif
} }
/** /**

2
net/ethernet/eth.c
View File

@@ -159,7 +159,7 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
skb_pull_inline(skb, ETH_HLEN); skb_pull_inline(skb, ETH_HLEN);
eth = eth_hdr(skb); eth = eth_hdr(skb);
if (unlikely(is_multicast_ether_addr(eth->h_dest))) { if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
skb->pkt_type = PACKET_BROADCAST; skb->pkt_type = PACKET_BROADCAST;
else else