Function try_setup_fd_instance

freebsd/net/route/fib_algo.c:877–965

* Tries to setup fd instance. * - Allocates fd/nhop table * - Runs algo:flm_init_cb algo init * - Subscribes fd to the rib * - Runs rtable dump * - Adds instance to the list of active instances. * * Returns: operation result. Fills in @pfd with resulting fd on success. * */

 *
 */
static enum flm_op_result
try_setup_fd_instance(struct fib_lookup_module *flm, struct rib_head *rh,
    struct fib_data *old_fd, struct fib_data **pfd)
{
	struct fib_data *fd;
	size_t size;
	enum flm_op_result result;

	/* Allocate */
	fd = malloc(sizeof(struct fib_data), M_RTABLE, M_NOWAIT | M_ZERO);
	if (fd == NULL)  {
		*pfd = NULL;
		RH_PRINTF(LOG_INFO, rh, "Unable to allocate fib_data structure");
		return (FLM_REBUILD);
	}
	*pfd = fd;

	estimate_nhop_scale(old_fd, fd);

	fd->fd_rh = rh;
	fd->fd_gen = ++fib_gen;
	fd->fd_family = rh->rib_family;
	fd->fd_fibnum = rh->rib_fibnum;
	callout_init_rm(&fd->fd_callout, &rh->rib_lock, 0);
	fd->fd_vnet = curvnet;
	fd->fd_flm = flm;

	FD_PRINTF(LOG_DEBUG, fd, "allocated fd %p", fd);

	FIB_MOD_LOCK();
	flm->flm_refcount++;
	FIB_MOD_UNLOCK();

	/* Allocate nhidx -> nhop_ptr table */
	size = fd->number_nhops * sizeof(void *);
	fd->nh_idx = malloc(size, M_RTABLE, M_NOWAIT | M_ZERO);
	if (fd->nh_idx == NULL) {
		FD_PRINTF(LOG_INFO, fd, "Unable to allocate nhop table idx (sz:%zu)", size);
		return (FLM_REBUILD);
	}

	/* Allocate nhop index refcount table */
	size = sizeof(struct nhop_ref_table);
	size += fd->number_nhops * sizeof(uint32_t);
	fd->nh_ref_table = malloc(size, M_RTABLE, M_NOWAIT | M_ZERO);
	if (fd->nh_ref_table == NULL) {
		FD_PRINTF(LOG_INFO, fd, "Unable to allocate nhop refcount table (sz:%zu)", size);
		return (FLM_REBUILD);
	}
	FD_PRINTF(LOG_DEBUG, fd, "Allocated %u nhop indexes", fd->number_nhops);

	/* Okay, we're ready for algo init */
	void *old_algo_data = (old_fd != NULL) ? old_fd->fd_algo_data : NULL;
	result = flm->flm_init_cb(fd->fd_fibnum, fd, old_algo_data, &fd->fd_algo_data);
	if (result != FLM_SUCCESS) {
		FD_PRINTF(LOG_INFO, fd, "%s algo init failed", flm->flm_name);
		return (result);
	}