D35498.diff
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	diff --git a/sys/dev/dwc/if_dwc.h b/sys/dev/dwc/if_dwc.h
	--- a/sys/dev/dwc/if_dwc.h
	+++ b/sys/dev/dwc/if_dwc.h
	@@ -48,6 +48,7 @@
	#define CONF_PS (1 << 15) /* GMII/MII */
	#define CONF_FES (1 << 14) /* MII speed select */
	#define CONF_DM (1 << 11) /* Full Duplex Enable */
	+#define CONF_IPC (1 << 10) /* IPC checksum offload */
	#define CONF_ACS (1 << 7)
	#define CONF_TE (1 << 3)
	#define CONF_RE (1 << 2)
	diff --git a/sys/dev/dwc/if_dwc.c b/sys/dev/dwc/if_dwc.c
	--- a/sys/dev/dwc/if_dwc.c
	+++ b/sys/dev/dwc/if_dwc.c
	@@ -518,6 +518,20 @@
	WRITE4(sc, MAC_CONFIGURATION, reg);
	}

	+static void
	+dwc_enable_csum_offload(struct dwc_softc *sc)
	+{
	+ uint32_t reg;
	+
	+ DWC_ASSERT_LOCKED(sc);
	+ reg = READ4(sc, MAC_CONFIGURATION);
	+ if ((if_getcapenable(sc->ifp) & IFCAP_RXCSUM) != 0)
	+ reg \|= CONF_IPC;
	+ else
	+ reg &= ~CONF_IPC;
	+ WRITE4(sc, MAC_CONFIGURATION, reg);
	+}
	+
	static void
	dwc_get_hwaddr(struct dwc_softc sc, uint8_t hwaddr)
	{
	@@ -1163,6 +1177,7 @@
	dwc_setup_rxfilter(sc);
	dwc_setup_core(sc);
	dwc_enable_mac(sc, true);
	+ dwc_enable_csum_offload(sc);
	dwc_init_dma(sc);

	if_setdrvflagbits(ifp, IFF_DRV_RUNNING, IFF_DRV_OACTIVE);
	@@ -1261,6 +1276,12 @@
	if_sethwassistbits(ifp, CSUM_IP \| CSUM_UDP \| CSUM_TCP, 0);
	else
	if_sethwassistbits(ifp, 0, CSUM_IP \| CSUM_UDP \| CSUM_TCP);
	+
	+ if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
	+ DWC_LOCK(sc);
	+ dwc_enable_csum_offload(sc);
	+ DWC_UNLOCK(sc);
	+ }
	break;

	default: