Function setup_fd_instance

freebsd/net/route/fib_algo.c:971–1030

* Sets up algo @flm for table @rh and links it to the datapath. * */

 *
 */
static enum flm_op_result
setup_fd_instance(struct fib_lookup_module *flm, struct rib_head *rh,
    struct fib_data *orig_fd, struct fib_data **pfd, bool attach)
{
	struct fib_data *prev_fd, *new_fd;
	enum flm_op_result result;

	NET_EPOCH_ASSERT();
	RIB_WLOCK_ASSERT(rh);

	prev_fd = orig_fd;
	new_fd = NULL;
	for (int i = 0; i < FIB_MAX_TRIES; i++) {
		result = try_setup_fd_instance(flm, rh, prev_fd, &new_fd);

		if ((result == FLM_SUCCESS) && attach)
			result = attach_datapath(new_fd);

		if ((prev_fd != NULL) && (prev_fd != orig_fd)) {
			schedule_destroy_fd_instance(prev_fd, false);
			prev_fd = NULL;
		}

		RH_PRINTF(LOG_INFO, rh, "try %d: fib algo result: %s", i,
		    print_op_result(result));

		if (result == FLM_REBUILD) {
			prev_fd = new_fd;
			new_fd = NULL;
			continue;
		}

		break;
	}

	if (result != FLM_SUCCESS) {
		RH_PRINTF(LOG_WARNING, rh,
		    "%s algo instance setup failed, failures=%d", flm->flm_name,
		    orig_fd ? orig_fd->fd_failed_rebuilds + 1 : 0);
		/* update failure count */
		FIB_MOD_LOCK();
		if (orig_fd != NULL)
			orig_fd->fd_failed_rebuilds++;
		FIB_MOD_UNLOCK();

		/* Ban algo on non-recoverable error */
		if (result == FLM_ERROR)
			flm_error_add(flm, rh->rib_fibnum);

		if ((prev_fd != NULL) && (prev_fd != orig_fd))
			schedule_destroy_fd_instance(prev_fd, false);
		if (new_fd != NULL) {
			schedule_destroy_fd_instance(new_fd, false);
			new_fd = NULL;
		}
	}

	*pfd = new_fd;