commit 2aa81938bd60d866d41cc9959b735f12b0d2f593
Author: Ryota Ozaki <ozaki-r@iij.ad.jp>
Date:   Tue Jan 19 11:21:48 2016 +0900

    WM polling RX (polling loop = 100)

diff --git a/sys/dev/pci/if_wm.c b/sys/dev/pci/if_wm.c
index de23f5c..555a921 100644
--- a/sys/dev/pci/if_wm.c
+++ b/sys/dev/pci/if_wm.c
@@ -318,6 +318,7 @@ struct wm_rxqueue {
 	struct mbuf **rxq_tailp;
 
 	/* XXX which event counter is required? */
+	void *rxq_si;
 };
 
 /*
@@ -604,6 +605,7 @@ static void	wm_nq_start_locked(struct ifnet *);
 /* Interrupt */
 static int	wm_txeof(struct wm_softc *);
 static void	wm_rxeof(struct wm_rxqueue *);
+static void	wm_rxeof_sih(void *);
 static void	wm_linkintr_gmii(struct wm_softc *, uint32_t);
 static void	wm_linkintr_tbi(struct wm_softc *, uint32_t);
 static void	wm_linkintr_serdes(struct wm_softc *, uint32_t);
@@ -2445,7 +2447,7 @@ alloc_retry:
 
 	/* Attach the interface. */
 	if_attach(ifp);
-	if_init_softint_input(ifp);
+	//if_init_softint_input(ifp);
 	ether_ifattach(ifp, enaddr);
 	ether_set_ifflags_cb(&sc->sc_ethercom, wm_ifflags_cb);
 	rnd_attach_source(&sc->rnd_source, xname, RND_TYPE_NET,
@@ -4371,6 +4373,9 @@ wm_setup_msix(struct wm_softc *sc)
 		rxq->rxq_id = qidx;
 		rxq->rxq_intr_idx = intr_idx;
 
+		rxq->rxq_si = softint_establish(SOFTINT_NET | SOFTINT_MPSAFE,
+		    wm_rxeof_sih, rxq);
+
 		rx_established++;
 		intr_idx++;
 	}
@@ -6943,8 +6948,12 @@ wm_rxeof(struct wm_rxqueue *rxq)
 	int count = 0;
 	uint8_t status, errors;
 	uint16_t vlantag;
+	int loop = 100; // same as FreeBSD's igb
 
 	for (i = rxq->rxq_ptr;; i = WM_NEXTRX(i)) {
+		if (--loop < 0)
+			break;
+
 		rxs = &rxq->rxq_soft[i];
 
 		DPRINTF(WM_DEBUG_RX,
@@ -7118,7 +7127,8 @@ wm_rxeof(struct wm_rxqueue *rxq)
 
 		WM_RX_UNLOCK(rxq);
 
-		if_input(ifp, m);
+		bpf_mtap(ifp, m);
+		ifp->if_input(ifp, m);
 
 		WM_RX_LOCK(rxq);
 
@@ -7133,6 +7143,22 @@ wm_rxeof(struct wm_rxqueue *rxq)
 
 	DPRINTF(WM_DEBUG_RX,
 	    ("%s: RX: rxptr -> %d\n", device_xname(sc->sc_dev), i));
+
+	// XXX ack
+	if (sc->sc_type == WM_T_82574)
+		CSR_WRITE(sc, WMREG_IMS, ICR_RXQ(rxq->rxq_id));
+	else if (sc->sc_type == WM_T_82575)
+		CSR_WRITE(sc, WMREG_EIMS, EITR_RX_QUEUE(rxq->rxq_id));
+	else
+		CSR_WRITE(sc, WMREG_EIMS, 1 << rxq->rxq_intr_idx);
+}
+
+static void
+wm_rxeof_sih(void *arg)
+{
+	struct wm_rxqueue *rxq = arg;
+
+	wm_rxeof(rxq);
 }
 
 /*
@@ -7529,17 +7555,20 @@ wm_rxintr_msix(void *arg)
 		goto out;
 
 	WM_EVCNT_INCR(&sc->sc_ev_rxintr);
-	wm_rxeof(rxq);
+	//wm_rxeof(rxq);
+	softint_schedule(rxq->rxq_si);
 
 out:
 	WM_RX_UNLOCK(rxq);
 
+#if 0
 	if (sc->sc_type == WM_T_82574)
 		CSR_WRITE(sc, WMREG_IMS, ICR_RXQ(rxq->rxq_id));
 	else if (sc->sc_type == WM_T_82575)
 		CSR_WRITE(sc, WMREG_EIMS, EITR_RX_QUEUE(rxq->rxq_id));
 	else
 		CSR_WRITE(sc, WMREG_EIMS, 1 << rxq->rxq_intr_idx);
+#endif
 
 	return 1;
 }