Function igmp_fasttimo_vnet

freebsd/netinet/igmp.c:1683–1794

* Fast timeout handler (per-vnet). * Sends are shuffled off to a netisr to deal with Giant. * * VIMAGE: Assume caller has set up our curvnet. */

 * VIMAGE: Assume caller has set up our curvnet.
 */
static void
igmp_fasttimo_vnet(void)
{
	struct mbufq		 scq;	/* State-change packets */
	struct mbufq		 qrq;	/* Query response packets */
	struct ifnet		*ifp;
	struct igmp_ifsoftc	*igi;
	struct ifmultiaddr	*ifma, *next;
	struct in_multi		*inm;
	struct in_multi_head inm_free_tmp;
	int			 loop, uri_fasthz;

	loop = 0;
	uri_fasthz = 0;

	/*
	 * Quick check to see if any work needs to be done, in order to
	 * minimize the overhead of fasttimo processing.
	 * SMPng: XXX Unlocked reads.
	 */
	if (!V_current_state_timers_running &&
	    !V_interface_timers_running &&
	    !V_state_change_timers_running)
		return;

	SLIST_INIT(&inm_free_tmp);
	IN_MULTI_LIST_LOCK();
	IGMP_LOCK();

	/*
	 * IGMPv3 General Query response timer processing.
	 */
	if (V_interface_timers_running) {
		CTR1(KTR_IGMPV3, "%s: interface timers running", __func__);

		V_interface_timers_running = 0;
		LIST_FOREACH(igi, &V_igi_head, igi_link) {
			if (igi->igi_v3_timer == 0) {
				/* Do nothing. */
			} else if (--igi->igi_v3_timer == 0) {
				igmp_v3_dispatch_general_query(igi);
			} else {
				V_interface_timers_running = 1;
			}
		}
	}

	if (!V_current_state_timers_running &&
	    !V_state_change_timers_running)
		goto out_locked;

	V_current_state_timers_running = 0;
	V_state_change_timers_running = 0;

	CTR1(KTR_IGMPV3, "%s: state change timers running", __func__);

	/*
	 * IGMPv1/v2/v3 host report and state-change timer processing.