Function ng_alloc_item

freebsd/netgraph/ng_base.c:2977–2999

* Get a queue entry. * This is usually called when a packet first enters netgraph. * By definition, this is usually from an interrupt, or from a user. * Users are not so important, but try be quick for the times that it's * an interrupt. */

 * an interrupt.
 */
static __inline item_p
ng_alloc_item(int type, int flags)
{
	item_p item;

	KASSERT(((type & ~NGQF_TYPE) == 0),
	    ("%s: incorrect item type: %d", __func__, type));

	item = uma_zalloc((type == NGQF_DATA) ? ng_qdzone : ng_qzone,
	    ((flags & NG_WAITOK) ? M_WAITOK : M_NOWAIT) | M_ZERO);

	if (item) {
		item->el_flags = type;
#ifdef	NETGRAPH_DEBUG
		mtx_lock(&ngq_mtx);
		TAILQ_INSERT_TAIL(&ng_itemlist, item, all);
		allocated++;
		mtx_unlock(&ngq_mtx);
#endif
	}

	return (item);
}

/*
 * Release a queue entry