[PATCH -next] etherdevice: Add ether_addr_equal_unaligned

From: Joe Perches
Date: Fri Dec 06 2013 - 17:21:18 EST


Add a generic routine to test if possibly unaligned
to u16 Ethernet addresses are equal.

If CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is set,
this uses the slightly faster generic routine
ether_addr_equal, otherwise this uses memcmp.

Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
---
include/linux/etherdevice.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 3526e81..eb36845 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -266,6 +266,24 @@ static inline bool ether_addr_equal_64bits(const u8 addr1[6+2],
}

/**
+ * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses
+ * @addr1: Pointer to a six-byte array containing the Ethernet address
+ * @addr2: Pointer other six-byte array containing the Ethernet address
+ *
+ * Compare two Ethernet addresses, returns true if equal
+ *
+ * Please note: Use only when any Ethernet address may not be u16 aligned.
+ */
+static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2)
+{
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+ return ether_addr_equal(addr1, addr2);
+#else
+ return memcmp(addr1, addr2, ETH_ALEN) == 0;
+#endif
+}
+
+/**
* 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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