[openib-general] [PATCH][RFC/v1][11/12] IPoIB IPv6 support

[Roland Dreier]

Add ipv6_ib_mc_map() to convert IPv6 multicast addresses to IPoIB
hardware addresses, and add support for autoconfiguration for devices
with type ARPHRD_INFINIBAND.

The mapping for multicast addresses is described in
  http://www.ietf.org/internet-drafts/draft-ietf-ipoib-ip-over-infiniband-07.txt

Signed-off-by: Nitin Hande <Nitin.Hande at Sun.Com>
Signed-off-by: Roland Dreier <roland at topspin.com>


Index: linux-bk/include/net/if_inet6.h
===================================================================
--- linux-bk.orig/include/net/if_inet6.h	2004-11-17 19:52:39.000000000 -0800
+++ linux-bk/include/net/if_inet6.h	2004-11-18 10:51:45.514343721 -0800
@@ -266,5 +266,20 @@
 {
 	buf[0] = 0x00;
 }
+
+static inline void ipv6_ib_mc_map(struct in6_addr *addr, char *buf)
+{
+	buf[0]  = 0;		/* Reserved */
+	buf[1]  = 0xff;		/* Multicast QPN */
+	buf[2]  = 0xff;
+	buf[3]  = 0xff;
+	buf[4]  = 0xff;
+	buf[5]  = 0x12;		/* link local scope */
+	buf[6]  = 0x60;		/* IPv6 signature */
+	buf[7]  = 0x1b;
+	buf[8]  = 0;		/* P_Key */
+	buf[9]  = 0;
+	memcpy(buf + 10, addr->s6_addr + 6, 10);
+}
 #endif
 #endif
Index: linux-bk/net/ipv6/addrconf.c
===================================================================
--- linux-bk.orig/net/ipv6/addrconf.c	2004-11-17 19:52:35.000000000 -0800
+++ linux-bk/net/ipv6/addrconf.c	2004-11-18 10:51:45.515343574 -0800
@@ -1098,6 +1098,13 @@
 		memset(eui, 0, 7);
 		eui[7] = *(u8*)dev->dev_addr;
 		return 0;
+	case ARPHRD_INFINIBAND:
+		/* XXX: replace len with IPOIB_HW_ADDR_LEN later */
+		if (dev->addr_len != 20)
+			return -1;
+		memcpy(eui, dev->dev_addr + 12, 8);
+		eui[0] |= 2;
+		return 0;
 	}
 	return -1;
 }
@@ -1797,6 +1804,7 @@
 	if ((dev->type != ARPHRD_ETHER) && 
 	    (dev->type != ARPHRD_FDDI) &&
 	    (dev->type != ARPHRD_IEEE802_TR) &&
+	    (dev->type != ARPHRD_INFINIBAND) &&
 	    (dev->type != ARPHRD_ARCNET)) {
 		/* Alas, we support only Ethernet autoconfiguration. */
 		return;
Index: linux-bk/net/ipv6/ndisc.c
===================================================================
--- linux-bk.orig/net/ipv6/ndisc.c	2004-11-17 19:52:19.000000000 -0800
+++ linux-bk/net/ipv6/ndisc.c	2004-11-18 10:51:45.516343427 -0800
@@ -260,6 +260,9 @@
 	case ARPHRD_ARCNET:
 		ipv6_arcnet_mc_map(addr, buf);
 		return 0;
+	case ARPHRD_INFINIBAND:
+		ipv6_ib_mc_map(addr, buf);
+		return 0;
 	default:
 		if (dir) {
 			memcpy(buf, dev->broadcast, dev->addr_len);