Add a generic routine to test if possibly unaligned to u16
Ethernet address is a zero address.
If CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is set, use
slightly faster generic routine is_zero_ether_addr(),
otherwise use byte accesses.
This is v2 of the original patch:
[PATCH] Modify is_zero_ether_addr() to handle byte-aligned addresses
Per Joe's suggestion -- instead of modifying is_zero_ether_addr() --
add is_zero_ether_addr_unaligned() and use it where needed.
Cc: Kalle Valo <kv...@codeaurora.org>
Cc: David S. Miller <da...@davemloft.net>
Cc: Joe Perches <j...@perches.com>
Cc: Amitkumar Karwar <akar...@marvell.com>
Signed-off-by: Petri Gynther <pgynt...@google.com>
---
include/linux/etherdevice.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 37ff4a6..f609691 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -105,6 +105,21 @@ static inline bool is_zero_ether_addr(const u8 *addr)
}
/**
+ * is_zero_ether_addr_unaligned - Determine if given Ethernet address is all
zeros.
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Return true if the address is all zeroes.
+ */
+static inline bool is_zero_ether_addr_unaligned(const u8 *addr)
+{
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+ return is_zero_ether_addr(addr);
+#else
+ return (addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]) == 0;
+#endif
+}
+
+/**
* is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
* @addr: Pointer to a six-byte array containing the Ethernet address
*
--
2.8.0.rc3.226.g39d4020
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