diff options
| author | Rolf Manderscheid <rvm@obsidianresearch.com> | 2007-12-10 13:38:41 -0700 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2008-01-25 14:15:37 -0800 |
| commit | a9e527e3f9f4510e9f3450ca3bc51bc3ef2854fd (patch) | |
| tree | 519458581cf3b8dd7c7a6d19c29572efb3405df1 /include/net/if_inet6.h | |
| parent | 755807a296f77ca7c31dc000afdfe1e5172bbf72 (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/if_inet6.h')
| -rw-r--r-- | include/net/if_inet6.h | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h index 448eccb2063..b24508abb85 100644 --- a/include/net/if_inet6.h +++ b/include/net/if_inet6.h @@ -269,18 +269,21 @@ static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf) buf[0] = 0x00; } -static inline void ipv6_ib_mc_map(struct in6_addr *addr, char *buf) +static inline void ipv6_ib_mc_map(const struct in6_addr *addr, + const unsigned char *broadcast, char *buf) { + unsigned char scope = broadcast[5] & 0xF; + 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[5] = 0x10 | scope; /* scope from broadcast address */ buf[6] = 0x60; /* IPv6 signature */ buf[7] = 0x1b; - buf[8] = 0; /* P_Key */ - buf[9] = 0; + buf[8] = broadcast[8]; /* P_Key */ + buf[9] = broadcast[9]; memcpy(buf + 10, addr->s6_addr + 6, 10); } #endif |