Function infiniband_input

freebsd/net/if_infiniband.c:404–504

* Process a received Infiniband packet. */

 * Process a received Infiniband packet.
 */
static void
infiniband_input(struct ifnet *ifp, struct mbuf *m)
{
	struct infiniband_header *ibh;
	struct epoch_tracker et;
	int isr;

	CURVNET_SET_QUIET(ifp->if_vnet);

	if ((ifp->if_flags & IFF_UP) == 0) {
		if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
		m_freem(m);
		goto done;
	}

	ibh = mtod(m, struct infiniband_header *);

	/*
	 * Reset layer specific mbuf flags to avoid confusing upper
	 * layers:
	 */
	m->m_flags &= ~M_VLANTAG;
	m_clrprotoflags(m);

	if (INFINIBAND_IS_MULTICAST(ibh->ib_hwaddr)) {
		if (memcmp(ibh->ib_hwaddr, ifp->if_broadcastaddr,
		    ifp->if_addrlen) == 0)
			m->m_flags |= M_BCAST;
		else
			m->m_flags |= M_MCAST;
		if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
	}

	/* Let BPF have it before we strip the header. */
	INFINIBAND_BPF_MTAP(ifp, m);

	/* Allow monitor mode to claim this frame, after stats are updated. */
	if (ifp->if_flags & IFF_MONITOR) {
		m_freem(m);
		goto done;
	}

	/* Direct packet to correct FIB based on interface config. */
	M_SETFIB(m, ifp->if_fib);

	/* Handle input from a lagg<N> port */
	if (ifp->if_type == IFT_INFINIBANDLAG) {
		KASSERT(lagg_input_infiniband_p != NULL,
		    ("%s: if_lagg not loaded!", __func__));
		m = (*lagg_input_infiniband_p)(ifp, m);
		if (__predict_false(m == NULL))
			goto done;
		ifp = m->m_pkthdr.rcvif;
	}

	/*
	 * Dispatch frame to upper layer.
	 */