Function nhgrp_ctl_alloc_default

freebsd/net/route/nhgrp.c:260–307

* Function allocating the necessary group data structures. */

 * Function allocating the necessary group data structures.
 */
bool
nhgrp_ctl_alloc_default(struct nh_control *ctl, int malloc_flags)
{
	size_t alloc_size;
	uint32_t num_buckets, num_items;
	void *cht_ptr, *mask_ptr;

	malloc_flags = (malloc_flags & (M_NOWAIT | M_WAITOK)) | M_ZERO;

	num_buckets = 8;
	alloc_size = CHT_SLIST_GET_RESIZE_SIZE(num_buckets);
	cht_ptr = malloc(alloc_size, M_NHOP, malloc_flags);

	if (cht_ptr == NULL) {
		DPRINTF("mpath init failed");
		return (false);
	}

	/*
	 * Allocate nexthop index bitmask.
	 */
	num_items = 128;
	mask_ptr = malloc(bitmask_get_size(num_items), M_NHOP, malloc_flags);
	if (mask_ptr == NULL) {
		DPRINTF("mpath bitmask init failed");
		free(cht_ptr, M_NHOP);
		return (false);
	}

	NHOPS_WLOCK(ctl);

	if (ctl->gr_head.hash_size == 0) {
		/* Init hash and bitmask */
		CHT_SLIST_INIT(&ctl->gr_head, cht_ptr, num_buckets);
		bitmask_init(&ctl->gr_idx_head, mask_ptr, num_items);
		NHOPS_WUNLOCK(ctl);
	} else {
		/* Other thread has already initiliazed hash/bitmask */
		NHOPS_WUNLOCK(ctl);
		free(cht_ptr, M_NHOP);
		free(mask_ptr, M_NHOP);
	}

	DPRINTF("mpath init done for fib/af %d/%d", ctl->rh->rib_fibnum,
	    ctl->rh->rib_family);

	return (true);
}

int
nhgrp_ctl_init(struct nh_control *ctl)