[PATCH v3] {net,IB}/{rxe,usnic}: Utilize generic mac to eui32 function

[Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>]

This logic seems to be duplicated in (at least) three separate files.
Move it to one place so code can be re-use.

Signed-off-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
v0 -> v1:
	* Add missing #include
	* Rename to genaddrconf_ifid_eui48
v1 -> v2:
	* Reset eui[0] to default if dev_id is used
v2 -> v3:
	* Add helper function to avoid re-setting eui[0] to default if
	  dev_id is used
---
 drivers/infiniband/hw/usnic/usnic_common_util.h | 11 +++--------
 drivers/infiniband/sw/rxe/rxe_net.c             | 11 ++---------
 include/net/addrconf.h                          | 25 +++++++++++++++++++------
 3 files changed, 24 insertions(+), 23 deletions(-)

diff --git a/drivers/infiniband/hw/usnic/usnic_common_util.h b/drivers/infiniband/hw/usnic/usnic_common_util.h
index b54986d..d91b035 100644
--- a/drivers/infiniband/hw/usnic/usnic_common_util.h
+++ b/drivers/infiniband/hw/usnic/usnic_common_util.h
@@ -34,6 +34,8 @@
 #ifndef USNIC_CMN_UTIL_H
 #define USNIC_CMN_UTIL_H
 
+#include <net/addrconf.h>
+
 static inline void
 usnic_mac_to_gid(const char *const mac, char *raw_gid)
 {
@@ -57,14 +59,7 @@ usnic_mac_ip_to_gid(const char *const mac, const __be32 inaddr, char *raw_gid)
 	raw_gid[1] = 0x80;
 	memset(&raw_gid[2], 0, 2);
 	memcpy(&raw_gid[4], &inaddr, 4);
-	raw_gid[8] = mac[0]^2;
-	raw_gid[9] = mac[1];
-	raw_gid[10] = mac[2];
-	raw_gid[11] = 0xff;
-	raw_gid[12] = 0xfe;
-	raw_gid[13] = mac[3];
-	raw_gid[14] = mac[4];
-	raw_gid[15] = mac[5];
+	addrconf_addr_eui48(&raw_gid[8], mac);
 }
 
 static inline void
diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
index d8610960..ab8ea23 100644
--- a/drivers/infiniband/sw/rxe/rxe_net.c
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -38,6 +38,7 @@
 #include <linux/if_vlan.h>
 #include <net/udp_tunnel.h>
 #include <net/sch_generic.h>
+#include <net/addrconf.h>
 #include <linux/netfilter.h>
 #include <rdma/ib_addr.h>
 
@@ -86,18 +87,10 @@ struct rxe_recv_sockets recv_sockets;
 
 static __be64 rxe_mac_to_eui64(struct net_device *ndev)
 {
-	unsigned char *mac_addr = ndev->dev_addr;
 	__be64 eui64;
 	unsigned char *dst = (unsigned char *)&eui64;
 
-	dst[0] = mac_addr[0] ^ 2;
-	dst[1] = mac_addr[1];
-	dst[2] = mac_addr[2];
-	dst[3] = 0xff;
-	dst[4] = 0xfe;
-	dst[5] = mac_addr[3];
-	dst[6] = mac_addr[4];
-	dst[7] = mac_addr[5];
+	addrconf_addr_eui48(dst, ndev->dev_addr);
 
 	return eui64;
 }
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 17c6fd8..28274ed 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -103,12 +103,25 @@ int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 				 u32 addr_flags, bool sllao, bool tokenized,
 				 __u32 valid_lft, u32 prefered_lft);
 
+static inline void addrconf_addr_eui48_xor(u8 *eui, const char *const addr, bool xor)
+{
+	memcpy(eui, addr, 3);
+	if (xor)
+		eui[0] ^= 2;
+	eui[3] = 0xFF;
+	eui[4] = 0xFE;
+	memcpy(eui + 5, addr + 3, 3);
+}
+
+static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
+{
+	addrconf_addr_eui48_xor(eui, addr, true);
+}
+
 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
@@ -123,14 +136,14 @@ static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 	 * case.  Hence the resulting interface identifier has local
 	 * scope according to RFC2373.
 	 */
+
+	addrconf_addr_eui48_xor(eui, dev->dev_addr, !dev->dev_id);
+
 	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;
 }
 
-- 
2.7.4

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