int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
			void *context)
{
	struct rdma_id_private *id_priv;
	struct cma_multicast *mc;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
	    !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
		return -EINVAL;

	mc = kmalloc(sizeof *mc, GFP_KERNEL);
	if (!mc)
		return -ENOMEM;

	memcpy(&mc->addr, addr, rdma_addr_size(addr));
	mc->context = context;
	mc->id_priv = id_priv;

	spin_lock(&id_priv->lock);
	list_add(&mc->list, &id_priv->mc_list);
	spin_unlock(&id_priv->lock);

	switch (rdma_node_get_transport(id->device->node_type)) {
	case RDMA_TRANSPORT_IB:
		switch (rdma_port_get_link_layer(id->device, id->port_num)) {
		case IB_LINK_LAYER_INFINIBAND:
			ret = cma_join_ib_multicast(id_priv, mc);
			break;
		case IB_LINK_LAYER_ETHERNET:
			kref_init(&mc->mcref);
			ret = cma_iboe_join_multicast(id_priv, mc);
			break;
		default:
			ret = -EINVAL;
		}
		break;
	default:
		ret = -ENOSYS;
		break;
	}

	if (ret) {
		spin_lock_irq(&id_priv->lock);
		list_del(&mc->list);
		spin_unlock_irq(&id_priv->lock);
		kfree(mc);
	}
	return ret;
}
int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
			void *context)
{
	struct rdma_id_private *id_priv;
	struct cma_multicast *mc;
	int ret;

	id_priv = container_of(id, struct rdma_id_private, id);
	if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
	    !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
		return -EINVAL;

	mc = kmalloc(sizeof *mc, GFP_KERNEL);
	if (!mc)
		return -ENOMEM;

	memcpy(&mc->addr, addr, rdma_addr_size(addr));
	mc->context = context;
	mc->id_priv = id_priv;

	spin_lock(&id_priv->lock);
	list_add(&mc->list, &id_priv->mc_list);
	spin_unlock(&id_priv->lock);

	switch (rdma_node_get_transport(id->device->node_type)) {
	case RDMA_TRANSPORT_IB:
		switch (rdma_port_get_link_layer(id->device, id->port_num)) {
		case IB_LINK_LAYER_INFINIBAND:
			ret = cma_join_ib_multicast(id_priv, mc);
			break;
		case IB_LINK_LAYER_ETHERNET:
			kref_init(&mc->mcref);
			ret = cma_iboe_join_multicast(id_priv, mc);
			break;
		default:
			ret = -EINVAL;
		}
		break;
	default:
		ret = -ENOSYS;
		break;
	}

	if (ret) {
		spin_lock_irq(&id_priv->lock);
		list_del(&mc->list);
		spin_unlock_irq(&id_priv->lock);
		kfree(mc);
	}
	return ret;
}