Function consider_resize

freebsd/net/route/nhop.c:236–279

* Checks if hash needs resizing and performs this resize if necessary * */

 *
 */
static void
consider_resize(struct nh_control *ctl, uint32_t new_nh_buckets, uint32_t new_idx_items)
{
	void *nh_ptr, *nh_idx_ptr;
	void *old_idx_ptr;
	size_t alloc_size;

	nh_ptr = NULL;
	if (new_nh_buckets != 0) {
		alloc_size = CHT_SLIST_GET_RESIZE_SIZE(new_nh_buckets);
		nh_ptr = malloc(alloc_size, M_NHOP, M_NOWAIT | M_ZERO);
	}

	nh_idx_ptr = NULL;
	if (new_idx_items != 0) {
		alloc_size = bitmask_get_size(new_idx_items);
		nh_idx_ptr = malloc(alloc_size, M_NHOP, M_NOWAIT | M_ZERO);
	}

	if (nh_ptr == NULL && nh_idx_ptr == NULL) {
		/* Either resize is not required or allocations have failed. */
		return;
	}

	DPRINTF("going to resize: nh:[ptr:%p sz:%u] idx:[ptr:%p sz:%u]", nh_ptr,
	    new_nh_buckets, nh_idx_ptr, new_idx_items);

	old_idx_ptr = NULL;

	NHOPS_WLOCK(ctl);
	if (nh_ptr != NULL) {
		CHT_SLIST_RESIZE(&ctl->nh_head, nhops, nh_ptr, new_nh_buckets);
	}
	if (nh_idx_ptr != NULL) {
		if (bitmask_copy(&ctl->nh_idx_head, nh_idx_ptr, new_idx_items) == 0)
			bitmask_swap(&ctl->nh_idx_head, nh_idx_ptr, new_idx_items, &old_idx_ptr);
	}
	NHOPS_WUNLOCK(ctl);

	if (nh_ptr != NULL)
		free(nh_ptr, M_NHOP);
	if (old_idx_ptr != NULL)
		free(old_idx_ptr, M_NHOP);
}

/*
 * Links nextop @nh_priv to the nexhop hash table and allocates