netdev - [net-next PATCH v2 09/10] net: ravb: Enable IPv6 TX checksum offload for GbEth

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Message-Id: <20241015133634.193-10-paul.barker.ct@bp.renesas.com>
Date: Tue, 15 Oct 2024 14:36:33 +0100
From: Paul Barker <paul.barker.ct@...renesas.com>
To: Sergey Shtylyov <s.shtylyov@....ru>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Paul Barker <paul.barker.ct@...renesas.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Niklas Söderlund <niklas.soderlund+renesas@...natech.se>,
	Biju Das <biju.das.jz@...renesas.com>,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
	netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [net-next PATCH v2 09/10] net: ravb: Enable IPv6 TX checksum offload for GbEth

The GbEth IP supports offloading IPv6 TCP, UDP & ICMPv6 checksums in the
TX path.

Signed-off-by: Paul Barker <paul.barker.ct@...renesas.com>
---
 drivers/net/ethernet/renesas/ravb.h      |  2 +-
 drivers/net/ethernet/renesas/ravb_main.c | 15 +++++++++++----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index e1e55e677215..d7b3810ce21b 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -998,7 +998,7 @@ enum CSR1_BIT {
 	CSR1_TDHD	= 0x08000000,
 };
 
-#define CSR1_CSUM_ENABLE (CSR1_TTCP4 | CSR1_TUDP4)
+#define CSR1_CSUM_ENABLE (CSR1_TTCP4 | CSR1_TUDP4 | CSR1_TTCP6 | CSR1_TUDP6)
 
 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 80c0d36bffcb..14b4462331b0 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2063,17 +2063,24 @@ 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);
+	u8 inner_protocol;
 
 	/* 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))
+	switch (ntohs(skb->protocol)) {
+	case ETH_P_IP:
+		inner_protocol = ip_hdr(skb)->protocol;
+		break;
+	case ETH_P_IPV6:
+		inner_protocol = ipv6_hdr(skb)->nexthdr;
+		break;
+	default:
 		return false;
+	}
 
-	switch (ip->protocol) {
+	switch (inner_protocol) {
 	case IPPROTO_TCP:
 	case IPPROTO_UDP:
 		return true;
-- 
2.43.0