static void cma_set_mgid(struct rdma_id_private *id_priv,
			 struct sockaddr *addr, union ib_gid *mgid)
{
	unsigned char mc_map[MAX_ADDR_LEN];
	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
	struct sockaddr_in *sin = (struct sockaddr_in *) addr;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;

	if (cma_any_addr(addr)) {
		memset(mgid, 0, sizeof *mgid);
	} else if ((addr->sa_family == AF_INET6) &&
		   ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
								 0xFF10A01B)) {
		/* IPv6 address is an SA assigned MGID. */
		memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
	} else if (addr->sa_family == AF_IB) {
		memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
	} else if (addr->sa_family == AF_INET6) {
		ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
		if (id_priv->id.ps == RDMA_PS_UDP)
			mc_map[7] = 0x01;	/* Use RDMA CM signature */
		*mgid = *(union ib_gid *) (mc_map + 4);
	} else {
		ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
		if (id_priv->id.ps == RDMA_PS_UDP)
			mc_map[7] = 0x01;	/* Use RDMA CM signature */
		*mgid = *(union ib_gid *) (mc_map + 4);
	}
}
Unknown