[net-next PATCH 10/11] net: ravb: Enable IPv6 TX checksum offload for GbEth

[Paul Barker <paul@pbarker.dev>]

From: Paul Barker <paul.barker.ct@bp.renesas.com>

The GbEth IP supports offloading IPv6 TCP, UDP & ICMPv6 checksums.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
---
 drivers/net/ethernet/renesas/ravb.h      |  3 ++-
 drivers/net/ethernet/renesas/ravb_main.c | 31 ++++++++++++++----------
 2 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 8523b89ba1c6..2cb6c4ef1330 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -998,7 +998,8 @@ enum CSR1_BIT {
 	CSR1_TDHD	= 0x08000000,
 };
 
-#define CSR1_CSUM_ENABLE (CSR1_TTCP4 | CSR1_TUDP4 | CSR1_TICMP4)
+#define CSR1_CSUM_ENABLE (CSR1_TTCP4 | CSR1_TUDP4 | CSR1_TICMP4 | \
+			  CSR1_TTCP6 | CSR1_TUDP6 | CSR1_TICMP6)
 
 enum CSR2_BIT {
 	CSR2_RIP4	= 0x00000001,
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 69d71fbf3e02..832132d44fb4 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2063,25 +2063,30 @@ static void ravb_tx_timeout_work(struct work_struct *work)
 
 static bool ravb_can_tx_csum_gbeth(struct sk_buff *skb)
 {
-	struct iphdr *ip = ip_hdr(skb);
-
 	/* TODO: Need to add support for VLAN tag 802.1Q */
 	if (skb_vlan_tag_present(skb))
 		return false;
 
-	/* TODO: Need to add hardware checksum for IPv6 */
-	if (skb->protocol != htons(ETH_P_IP))
-		return false;
-
-	switch (ip->protocol) {
-	case IPPROTO_TCP:
-	case IPPROTO_UDP:
-	case IPPROTO_ICMP:
-		return true;
+	switch (ntohs(skb->protocol)) {
+	case ETH_P_IP:
+		switch (ip_hdr(skb)->protocol) {
+		case IPPROTO_TCP:
+		case IPPROTO_UDP:
+		case IPPROTO_ICMP:
+			return true;
+		}
+		break;
 
-	default:
-		return false;
+	case ETH_P_IPV6:
+		switch (ipv6_hdr(skb)->nexthdr) {
+		case IPPROTO_TCP:
+		case IPPROTO_UDP:
+		case IPPROTO_ICMPV6:
+			return true;
+		}
 	}
+
+	return false;
 }
 
 /* Packet transmit function for Ethernet AVB */
-- 
2.43.0