Function if_alloc_domain

freebsd/net/if.c:592–653

* Allocate a struct ifnet and an index for an interface. A layer 2 * common structure will also be allocated if an allocation routine is * registered for the passed type. */

 * registered for the passed type.
 */
struct ifnet *
if_alloc_domain(u_char type, int numa_domain)
{
	struct ifnet *ifp;
	u_short idx;
	void *old = NULL;

	KASSERT(numa_domain <= IF_NODOM, ("numa_domain too large"));
	if (numa_domain == IF_NODOM)
		ifp = malloc(sizeof(struct ifnet), M_IFNET,
		    M_WAITOK | M_ZERO);
	else
		ifp = malloc_domainset(sizeof(struct ifnet), M_IFNET,
		    DOMAINSET_PREF(numa_domain), M_WAITOK | M_ZERO);
 restart:
	IFNET_WLOCK();
	idx = ifindex_alloc(&old);
	if (__predict_false(idx == USHRT_MAX)) {
		IFNET_WUNLOCK();
		epoch_wait_preempt(net_epoch_preempt);
		free(old, M_IFNET);
		goto restart;
	}
	ifnet_setbyindex(idx, IFNET_HOLD);
	IFNET_WUNLOCK();
	ifp->if_index = idx;
	ifp->if_type = type;
	ifp->if_alloctype = type;
	ifp->if_numa_domain = numa_domain;
#ifdef VIMAGE
	ifp->if_vnet = curvnet;
#endif
	if (if_com_alloc[type] != NULL) {
		ifp->if_l2com = if_com_alloc[type](type, ifp);
		if (ifp->if_l2com == NULL) {
			free(ifp, M_IFNET);
			ifindex_free(idx);
			return (NULL);
		}
	}

	IF_ADDR_LOCK_INIT(ifp);
	TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
	TASK_INIT(&ifp->if_addmultitask, 0, if_siocaddmulti, ifp);
	ifp->if_afdata_initialized = 0;
	IF_AFDATA_LOCK_INIT(ifp);
	CK_STAILQ_INIT(&ifp->if_addrhead);
	CK_STAILQ_INIT(&ifp->if_multiaddrs);
	CK_STAILQ_INIT(&ifp->if_groups);
#ifdef MAC
	mac_ifnet_init(ifp);
#endif
	ifq_init(&ifp->if_snd, ifp);

	refcount_init(&ifp->if_refcount, 1);	/* Index reference. */
	for (int i = 0; i < IFCOUNTERS; i++)
		ifp->if_counters[i] = counter_u64_alloc(M_WAITOK);
	ifp->if_get_counter = if_get_counter_default;