eth: Rename and properly align br_reserved_address array

Since this array is no longer part of the bridge driver, it should
have an 'eth' prefix not 'br'.

We also assume that either it's 16-bit-aligned or the architecture has
efficient unaligned access.  Ensure the first of these is true by
explicitly aligning it.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/etherdevice.h

@@ -52,7 +52,8 @@ extern struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
 #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)
 
 /* Reserved Ethernet Addresses per IEEE 802.1Q */
-static const u8 br_reserved_address[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
+static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
+{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
 
 /**
  * is_link_local_ether_addr - Determine if given Ethernet address is link-local
@@ -64,7 +65,7 @@ static const u8 br_reserved_address[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00,
 static inline bool is_link_local_ether_addr(const u8 *addr)
 {
 	__be16 *a = (__be16 *)addr;
-	static const __be16 *b = (const __be16 *)br_reserved_address;
+	static const __be16 *b = (const __be16 *)eth_reserved_addr_base;
 	static const __be16 m = cpu_to_be16(0xfff0);
 
 	return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;

net/bridge/br_device.c

@@ -358,7 +358,7 @@ void br_dev_setup(struct net_device *dev)
 	br->bridge_id.prio[0] = 0x80;
 	br->bridge_id.prio[1] = 0x00;
 
-	memcpy(br->group_addr, br_reserved_address, ETH_ALEN);
+	memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN);
 
 	br->stp_enabled = BR_NO_STP;
 	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;