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authorRolf Manderscheid <rvm@obsidianresearch.com>2007-12-10 13:38:41 -0700
committerRoland Dreier <rolandd@cisco.com>2008-01-25 14:15:37 -0800
commita9e527e3f9f4510e9f3450ca3bc51bc3ef2854fd (patch)
tree519458581cf3b8dd7c7a6d19c29572efb3405df1 /include/net/ip.h
parent755807a296f77ca7c31dc000afdfe1e5172bbf72 (diff)
IPoIB: improve IPv4/IPv6 to IB mcast mapping functions
An IPoIB subnet on an IB fabric that spans multiple IB subnets can't use link-local scope in multicast GIDs. The existing routines that map IP/IPv6 multicast addresses into IB link-level addresses hard-code the scope to link-local, and they also leave the partition key field uninitialised. This patch adds a parameter (the link-level broadcast address) to the mapping routines, allowing them to initialise both the scope and the P_Key appropriately, and fixes up the call sites. The next step will be to add a way to configure the scope for an IPoIB interface. Signed-off-by: Rolf Manderscheid <rvm@obsidianresearch.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'include/net/ip.h')
-rw-r--r--include/net/ip.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/include/net/ip.h b/include/net/ip.h
index 840dd91b513..50c8889b1b8 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -266,20 +266,22 @@ static inline void ip_eth_mc_map(__be32 naddr, char *buf)
* Leave P_Key as 0 to be filled in by driver.
*/
-static inline void ip_ib_mc_map(__be32 naddr, char *buf)
+static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
{
__u32 addr;
+ unsigned char scope = broadcast[5] & 0xF;
+
buf[0] = 0; /* Reserved */
buf[1] = 0xff; /* Multicast QPN */
buf[2] = 0xff;
buf[3] = 0xff;
addr = ntohl(naddr);
buf[4] = 0xff;
- buf[5] = 0x12; /* link local scope */
+ buf[5] = 0x10 | scope; /* scope from broadcast address */
buf[6] = 0x40; /* IPv4 signature */
buf[7] = 0x1b;
- buf[8] = 0; /* P_Key */
- buf[9] = 0;
+ buf[8] = broadcast[8]; /* P_Key */
+ buf[9] = broadcast[9];
buf[10] = 0;
buf[11] = 0;
buf[12] = 0;