dpaa2: Setup interface caps on attach

39d4094173 ("epair: add support for checksum offloading") revealed
that HW checksum offloading is not enabled when the dpaa2_ni driver
is attached despite being declared and enabled on the dpni interface.

I modified dpaa2_ni_setup_if_caps to take into account both IPv4 and
IPv6 checksum offloading capabilities and added a call to re-configure
interface capabilities on attach to fix it.

Reviewed by:	bz
Fixes:		39d4094173 ("epair: add support for checksum offloading")
MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D53436

sys/dev/dpaa2/dpaa2_ni.c

@@ -559,7 +559,8 @@ dpaa2_ni_attach(device_t dev)
 	if_settransmitfn(ifp, dpaa2_ni_transmit);
 	if_setqflushfn(ifp, dpaa2_ni_qflush);
 
-	if_setcapabilities(ifp, IFCAP_VLAN_MTU | IFCAP_HWCSUM | IFCAP_JUMBO_MTU);
+	if_setcapabilities(ifp, IFCAP_VLAN_MTU | IFCAP_HWCSUM |
+	    IFCAP_HWCSUM_IPV6 | IFCAP_JUMBO_MTU);
 	if_setcapenable(ifp, if_getcapabilities(ifp));
 
 	DPAA2_CMD_INIT(&cmd);
@@ -627,6 +628,12 @@ dpaa2_ni_attach(device_t dev)
 		    __func__, error);
 		goto close_ni;
 	}
+	error = dpaa2_ni_setup_if_caps(sc);
+	if (error) {
+		device_printf(dev, "%s: failed to setup interface capabilities: "
+		    "error=%d\n", __func__, error);
+		goto close_ni;
+	}
 
 	ether_ifattach(sc->ifp, sc->mac.addr);
 	callout_init(&sc->mii_callout, 0);
@@ -1569,8 +1576,7 @@ dpaa2_ni_setup_msi(struct dpaa2_ni_softc *sc)
 static int
 dpaa2_ni_setup_if_caps(struct dpaa2_ni_softc *sc)
 {
-	const bool en_rxcsum = if_getcapenable(sc->ifp) & IFCAP_RXCSUM;
-	const bool en_txcsum = if_getcapenable(sc->ifp) & IFCAP_TXCSUM;
+	bool en_rxcsum, en_txcsum;
 	device_t pdev = device_get_parent(sc->dev);
 	device_t dev = sc->dev;
 	device_t child = dev;
@@ -1582,6 +1588,17 @@ dpaa2_ni_setup_if_caps(struct dpaa2_ni_softc *sc)
 
 	DPAA2_CMD_INIT(&cmd);
 
+	/*
+	 * XXX-DSL: DPAA2 allows to validate L3/L4 checksums on reception and/or
+	 *          generate L3/L4 checksums on transmission without
+	 *          differentiating between IPv4/v6, i.e. enable for both
+	 *          protocols if requested.
+	 */
+	en_rxcsum = if_getcapenable(sc->ifp) &
+	    (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6);
+	en_txcsum = if_getcapenable(sc->ifp) &
+	    (IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6);
+
 	error = DPAA2_CMD_RC_OPEN(dev, child, &cmd, rcinfo->id, &rc_token);
 	if (error) {
 		device_printf(dev, "%s: failed to open resource container: "
@@ -1627,6 +1644,13 @@ dpaa2_ni_setup_if_caps(struct dpaa2_ni_softc *sc)
 		goto close_ni;
 	}
 
+	if (bootverbose) {
+		device_printf(dev, "%s: L3/L4 checksum validation %s\n",
+		    __func__, en_rxcsum ? "enabled" : "disabled");
+		device_printf(dev, "%s: L3/L4 checksum generation %s\n",
+		    __func__, en_txcsum ? "enabled" : "disabled");
+	}
+
 	(void)DPAA2_CMD_NI_CLOSE(dev, child, &cmd);
 	(void)DPAA2_CMD_RC_CLOSE(dev, child, DPAA2_CMD_TK(&cmd, rc_token));
 	return (0);
@@ -2574,13 +2598,27 @@ dpaa2_ni_ioctl(if_t ifp, u_long c, caddr_t data)
 		break;
 	case SIOCSIFCAP:
 		changed = if_getcapenable(ifp) ^ ifr->ifr_reqcap;
-		if (changed & IFCAP_HWCSUM) {
-			if ((ifr->ifr_reqcap & changed) & IFCAP_HWCSUM) {
-				if_setcapenablebit(ifp, IFCAP_HWCSUM, 0);
+		if (changed & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
+			if ((ifr->ifr_reqcap & changed) &
+			    (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
+				if_setcapenablebit(ifp,
+				    IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6, 0);
 			} else {
-				if_setcapenablebit(ifp, 0, IFCAP_HWCSUM);
+				if_setcapenablebit(ifp, 0,
+				    IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6);
 			}
 		}
+		if (changed & (IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6)) {
+			if ((ifr->ifr_reqcap & changed) &
+			    (IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6)) {
+				if_setcapenablebit(ifp,
+				    IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0);
+			} else {
+				if_setcapenablebit(ifp, 0,
+				    IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6);
+			}
+		}
+
 		rc = dpaa2_ni_setup_if_caps(sc);
 		if (rc) {
 			printf("%s: failed to update iface capabilities: "