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IB/core: Set RoCEv2 MGID according to spec

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RoCEv2 Annex states that for RoCEv2 over IPv4, the corresponding
IPv4 address is encoded into the GID according to the following rule:
GID= :ffff:<IPv4 address>

Remove the 0xff0e prefix for RoCEv2 packets with IPv4 and leave it
zeroed and change rdma_is_multicast_addr() to consider the new logic.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Noa Osherovich
2017-06-12 11:14:03 +03:00
committed by Doug Ledford
parent 5236333592
commit be1d325a33
3 changed files with 20 additions and 11 deletions
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8
include/rdma/ib_addr.h
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@@ -304,7 +304,13 @@ static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
static inline int rdma_is_multicast_addr(struct in6_addr *addr)
{
return addr->s6_addr[0] == 0xff;
u32 ipv4_addr;
if (addr->s6_addr[0] == 0xff)
return 1;
memcpy(&ipv4_addr, addr->s6_addr + 12, 4);
return (ipv6_addr_v4mapped(addr) && ipv4_is_multicast(ipv4_addr));
}
static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)