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authorJoe Perches <joe@perches.com>2012-05-09 17:04:03 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-10 23:33:01 -0400
commitbaf523c9ba4a69e97b0b5a6fb0e0a9e43550a65b (patch)
tree9c0a9ba3234ceecf51f292bb2089ce787d993b8b
parent2e42e4747ea72943c21551d8a206b51a9893b1e0 (diff)
etherdevice.h: Add ether_addr_equal_64bits
Add an optimized boolean function to check if 2 ethernet addresses are the same. This is to avoid any confusion about compare_ether_addr_64bits returning an unsigned, and not being able to use the compare_ether_addr_64bits function for sorting ala memcmp. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/etherdevice.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index f3301140d28a..afacf8576d0f 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -225,6 +225,26 @@ static inline unsigned compare_ether_addr_64bits(const u8 addr1[6+2],
}
/**
+ * ether_addr_equal_64bits - Compare two Ethernet addresses
+ * @addr1: Pointer to an array of 8 bytes
+ * @addr2: Pointer to an other array of 8 bytes
+ *
+ * Compare two ethernet addresses, returns true if equal, false otherwise.
+ *
+ * The function doesn't need any conditional branches and possibly uses
+ * word memory accesses on CPU allowing cheap unaligned memory reads.
+ * arrays = { byte1, byte2, byte3, byte4, byte6, byte7, pad1, pad2}
+ *
+ * Please note that alignment of addr1 & addr2 is only guaranted to be 16 bits.
+ */
+
+static inline bool ether_addr_equal_64bits(const u8 addr1[6+2],
+ const u8 addr2[6+2])
+{
+ return !compare_ether_addr_64bits(addr1, addr2);
+}
+
+/**
* is_etherdev_addr - Tell if given Ethernet address belongs to the device.
* @dev: Pointer to a device structure
* @addr: Pointer to a six-byte array containing the Ethernet address

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