From 399e6f95811bd36fb64b3d30cf8529d633884b4c Mon Sep 17 00:00:00 2001 From: Matan Barak Date: Thu, 30 Jul 2015 18:33:22 +0300 Subject: 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 Signed-off-by: Doug Ledford --- include/net/addrconf.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'include/net/addrconf.h') diff --git a/include/net/addrconf.h b/include/net/addrconf.h index def59d3a34d5..431fdfa3f56d 100644 --- a/include/net/addrconf.h +++ b/include/net/addrconf.h @@ -91,6 +91,37 @@ int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2); void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); +static inline 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 inline unsigned long addrconf_timeout_fixup(u32 timeout, unsigned int unit) { -- cgit v1.2.1