Add support for TX/RX checksum offload for newer re(4) chipsets.

Tested by naddy@

From FreeBSD

2 files changed, 48 insertions, 21 deletions

diff --git a/sys/dev/ic/re.c b/sys/dev/ic/re.c
index ff80af8acd7..b680dfc6532 100644
--- a/sys/dev/ic/re.c
+++ b/sys/dev/ic/re.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: re.c,v 1.85 2008/08/05 01:58:47 brad Exp $	*/
+/*	$OpenBSD: re.c,v 1.86 2008/08/11 22:42:19 brad Exp $	*/
 /*	$FreeBSD: if_re.c,v 1.31 2004/09/04 07:54:05 ru Exp $	*/
 /*
  * Copyright (c) 1997, 1998-2003
@@ -1067,11 +1067,8 @@ re_attach(struct rl_softc *sc, const char *intrstr)
 	IFQ_SET_MAXLEN(&ifp->if_snd, RL_TX_QLEN);
 	IFQ_SET_READY(&ifp->if_snd);
 
-	
-	ifp->if_capabilities = IFCAP_VLAN_MTU;
-	if ((sc->rl_flags & RL_FLAG_DESCV2) == 0)
-		ifp->if_capabilities |= IFCAP_CSUM_IPv4 |
-		    IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4;
+	ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_CSUM_IPv4 |
+			       IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4;
 
 #if NVLAN > 0
 	ifp->if_capabilities |= IFCAP_VLAN_HWTAGGING;
@@ -1292,7 +1289,7 @@ re_rxeof(struct rl_softc *sc)
 	int		i, total_len;
 	struct rl_desc	*cur_rx;
 	struct rl_rxsoft *rxs;
-	u_int32_t	rxstat;
+	u_int32_t	rxstat, rxvlan;
 
 	ifp = &sc->sc_arpcom.ac_if;
 
@@ -1301,6 +1298,7 @@ re_rxeof(struct rl_softc *sc)
 		RL_RXDESCSYNC(sc, i,
 		    BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
 		rxstat = letoh32(cur_rx->rl_cmdstat);
+		rxvlan = letoh32(cur_rx->rl_vlanctl);
 		RL_RXDESCSYNC(sc, i, BUS_DMASYNC_PREREAD);
 		if ((rxstat & RL_RDESC_STAT_OWN) != 0)
 			break;
@@ -1413,7 +1411,19 @@ re_rxeof(struct rl_softc *sc)
 		/* Do RX checksumming */
 
 		if (sc->rl_flags & RL_FLAG_DESCV2) {
-			/* XXX V2 CSUM */
+			/* Check IP header checksum */
+			if ((rxstat & RL_RDESC_STAT_PROTOID) &&
+			    !(rxstat & RL_RDESC_STAT_IPSUMBAD) &&
+			    (rxvlan & RL_RDESC_IPV4))
+				m->m_pkthdr.csum_flags |= M_IPV4_CSUM_IN_OK;
+
+			/* Check TCP/UDP checksum */
+			if (((rxstat & RL_RDESC_STAT_TCP) &&
+			    !(rxstat & RL_RDESC_STAT_TCPSUMBAD)) ||
+			    ((rxstat & RL_RDESC_STAT_UDP) &&
+			    !(rxstat & RL_RDESC_STAT_UDPSUMBAD)))
+				m->m_pkthdr.csum_flags |= M_TCP_CSUM_IN_OK |
+				    M_UDP_CSUM_IN_OK;
 		} else {
 			/* Check IP header checksum */
 			if ((rxstat & RL_RDESC_STAT_PROTOID) &&
@@ -1600,7 +1610,7 @@ re_encap(struct rl_softc *sc, struct mbuf *m, int *idx)
 	bus_dmamap_t	map;
 	int		error, seg, nsegs, uidx, startidx, curidx, lastidx, pad;
 	struct rl_desc	*d;
-	u_int32_t	cmdstat, vlanctl, rl_flags = 0;
+	u_int32_t	cmdstat, vlanctl = 0, csum_flags = 0;
 	struct rl_txq	*txq;
 #if NVLAN > 0
 	struct ifvlan	*ifv = NULL;
@@ -1628,11 +1638,19 @@ re_encap(struct rl_softc *sc, struct mbuf *m, int *idx)
 
 	if ((m->m_pkthdr.csum_flags &
 	    (M_IPV4_CSUM_OUT|M_TCPV4_CSUM_OUT|M_UDPV4_CSUM_OUT)) != 0) {
-		rl_flags |= RL_TDESC_CMD_IPCSUM;
-		if (m->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT)
-			rl_flags |= RL_TDESC_CMD_TCPCSUM;
-		if (m->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT)
-			rl_flags |= RL_TDESC_CMD_UDPCSUM;
+		if (sc->rl_flags & RL_FLAG_DESCV2) {
+			vlanctl |= RL_TDESC_CMD_IPCSUMV2;
+			if (m->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT)
+				vlanctl |= RL_TDESC_CMD_TCPCSUMV2;
+			if (m->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT)
+				vlanctl |= RL_TDESC_CMD_UDPCSUMV2;
+		} else {
+			csum_flags |= RL_TDESC_CMD_IPCSUM;
+			if (m->m_pkthdr.csum_flags & M_TCPV4_CSUM_OUT)
+				csum_flags |= RL_TDESC_CMD_TCPCSUM;
+			if (m->m_pkthdr.csum_flags & M_UDPV4_CSUM_OUT)
+				csum_flags |= RL_TDESC_CMD_UDPCSUM;
+		}
 	}
 
 	txq = &sc->rl_ldata.rl_txq[*idx];
@@ -1648,8 +1666,9 @@ re_encap(struct rl_softc *sc, struct mbuf *m, int *idx)
 
 	nsegs = map->dm_nsegs;
 	pad = 0;
-	if (m->m_pkthdr.len <= RL_IP4CSUMTX_PADLEN &&
-	    (rl_flags & RL_TDESC_CMD_IPCSUM) != 0) {
+	if ((sc->rl_flags & RL_FLAG_DESCV2) == 0 &&
+	    m->m_pkthdr.len <= RL_IP4CSUMTX_PADLEN &&
+	    (csum_flags & RL_TDESC_CMD_IPCSUM) != 0) {
 		pad = 1;
 		nsegs++;
 	}
@@ -1671,10 +1690,9 @@ re_encap(struct rl_softc *sc, struct mbuf *m, int *idx)
 	 * appear in all descriptors of a multi-descriptor
 	 * transmission attempt.
 	 */
-	vlanctl = 0;
 #if NVLAN > 0
 	if (ifv != NULL)
-		vlanctl = swap16(ifv->ifv_tag) | RL_TDESC_VLANCTL_TAG;
+		vlanctl |= swap16(ifv->ifv_tag) | RL_TDESC_VLANCTL_TAG;
 #endif
 
 	/*
@@ -1713,7 +1731,7 @@ re_encap(struct rl_softc *sc, struct mbuf *m, int *idx)
 
 		d->rl_vlanctl = htole32(vlanctl);
 		re_set_bufaddr(d, map->dm_segs[seg].ds_addr);
-		cmdstat = rl_flags | map->dm_segs[seg].ds_len;
+		cmdstat = csum_flags | map->dm_segs[seg].ds_len;
 		if (seg == 0)
 			cmdstat |= RL_TDESC_CMD_SOF;
 		else
@@ -1735,7 +1753,7 @@ re_encap(struct rl_softc *sc, struct mbuf *m, int *idx)
 		d->rl_vlanctl = htole32(vlanctl);
 		paddaddr = RL_TXPADDADDR(sc);
 		re_set_bufaddr(d, paddaddr);
-		cmdstat = rl_flags |
+		cmdstat = csum_flags |
 		    RL_TDESC_CMD_OWN | RL_TDESC_CMD_EOF |
 		    (RL_IP4CSUMTX_PADLEN + 1 - m->m_pkthdr.len);
 		if (curidx == (RL_TX_DESC_CNT(sc) - 1))
diff --git a/sys/dev/ic/rtl81x9reg.h b/sys/dev/ic/rtl81x9reg.h
index b5492f9f2b4..8413bad71d8 100644
--- a/sys/dev/ic/rtl81x9reg.h
+++ b/sys/dev/ic/rtl81x9reg.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rtl81x9reg.h,v 1.49 2008/07/15 13:21:17 jsg Exp $	*/
+/*	$OpenBSD: rtl81x9reg.h,v 1.50 2008/08/11 22:42:19 brad Exp $	*/
 
 /*
  * Copyright (c) 1997, 1998
@@ -528,6 +528,10 @@ struct rl_desc {
 
 #define RL_TDESC_VLANCTL_TAG	0x00020000	/* Insert VLAN tag */
 #define RL_TDESC_VLANCTL_DATA	0x0000FFFF	/* TAG data */
+/* RTL8168C/RTL8168CP/RTL8111C/RTL8111CP */
+#define	RL_TDESC_CMD_IPCSUMV2	0x20000000
+#define	RL_TDESC_CMD_TCPCSUMV2	0x40000000
+#define	RL_TDESC_CMD_UDPCSUMV2	0x80000000
 
 /*
  * Error bits are valid only on the last descriptor of a frame
@@ -565,6 +569,8 @@ struct rl_desc {
 #define RL_RDESC_STAT_RUNT	0x00080000	/* runt packet received */
 #define RL_RDESC_STAT_CRCERR	0x00040000	/* CRC error */
 #define RL_RDESC_STAT_PROTOID	0x00030000	/* Protocol type */
+#define	RL_RDESC_STAT_UDP	0x00020000	/* UDP, 8168C/CP, 8111C/CP */
+#define	RL_RDESC_STAT_TCP	0x00010000	/* TCP, 8168C/CP, 8111C/CP */
 #define RL_RDESC_STAT_IPSUMBAD	0x00008000	/* IP header checksum bad */
 #define RL_RDESC_STAT_UDPSUMBAD	0x00004000	/* UDP checksum bad */
 #define RL_RDESC_STAT_TCPSUMBAD	0x00002000	/* TCP checksum bad */
@@ -576,6 +582,9 @@ struct rl_desc {
 #define RL_RDESC_VLANCTL_TAG	0x00010000	/* VLAN tag available
 						   (rl_vlandata valid)*/
 #define RL_RDESC_VLANCTL_DATA	0x0000FFFF	/* TAG data */
+/* RTL8168C/RTL8168CP/RTL8111C/RTL8111CP */
+#define	RL_RDESC_IPV6		0x80000000
+#define	RL_RDESC_IPV4		0x40000000
 
 #define RL_PROTOID_NONIP	0x00000000
 #define RL_PROTOID_TCPIP	0x00010000