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IPoIB: improve IPv4/IPv6 to IB mcast mapping functions

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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>
This commit is contained in:
Rolf Manderscheid
2007-12-10 13:38:41 -07:00
committed by Roland Dreier
parent 755807a296
commit a9e527e3f9
6 changed files with 16 additions and 17 deletions
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2
net/ipv4/arp.c
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@@ -211,7 +211,7 @@ int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir)
ip_tr_mc_map(addr, haddr);
return 0;
case ARPHRD_INFINIBAND:
ip_ib_mc_map(addr, haddr);
ip_ib_mc_map(addr, dev->broadcast, haddr);
return 0;
default:
if (dir) {