netdev - [PATCH 2/3] etherdev: Process is_multicast_ether

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Message-ID: <20150430215354.1798.89685.stgit@ahduyck-vm-fedora22>
Date:	Thu, 30 Apr 2015 14:53:54 -0700
From:	Alexander Duyck <alexander.h.duyck@...hat.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net
Subject: [PATCH 2/3] etherdev: Process is_multicast_ether_addr at same size
 as other operations

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@...hat.com>
---
 include/linux/etherdevice.h |   24 +++++++++++++++++++++++-
 net/ethernet/eth.c          |    2 +-
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 606563ef8a72..c4a10f991fe0 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -110,7 +110,29 @@ static inline bool is_zero_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
 }
 
 /**
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 60069318d5d1..21c211e9fd5a 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -159,7 +159,7 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
 	skb_pull_inline(skb, ETH_HLEN);
 	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))
 			skb->pkt_type = PACKET_BROADCAST;
 		else

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