net/ipv6: Export addrconf_ifid_eui48

For loopback purposes, RoCE devices should have a default GID in the
port GID table, even when the interface is down. In order to do so,
we use the IPv6 link local address which would have been genenrated
for the related Ethernet netdevice when it goes up as a default GID.

addrconf_ifid_eui48 is used to gernerate this address, export it.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 0 insertions, 31 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 21c2c818df3b..5b0c041323d7 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1845,37 +1845,6 @@ static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
 	__ipv6_dev_ac_dec(ifp->idev, &addr);
 }
 
-static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
-{
-	if (dev->addr_len != ETH_ALEN)
-		return -1;
-	memcpy(eui, dev->dev_addr, 3);
-	memcpy(eui + 5, dev->dev_addr + 3, 3);
-
-	/*
-	 * The zSeries OSA network cards can be shared among various
-	 * OS instances, but the OSA cards have only one MAC address.
-	 * This leads to duplicate address conflicts in conjunction
-	 * with IPv6 if more than one instance uses the same card.
-	 *
-	 * The driver for these cards can deliver a unique 16-bit
-	 * identifier for each instance sharing the same card.  It is
-	 * placed instead of 0xFFFE in the interface identifier.  The
-	 * "u" bit of the interface identifier is not inverted in this
-	 * case.  Hence the resulting interface identifier has local
-	 * scope according to RFC2373.
-	 */
-	if (dev->dev_id) {
-		eui[3] = (dev->dev_id >> 8) & 0xFF;
-		eui[4] = dev->dev_id & 0xFF;
-	} else {
-		eui[3] = 0xFF;
-		eui[4] = 0xFE;
-		eui[0] ^= 2;
-	}
-	return 0;
-}
-
 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
 {
 	if (dev->addr_len != IEEE802154_ADDR_LEN)