netdev - [PATCH net-next 2/7] i40e: Don't do TX csum offload with routing header present

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Message-Id: <20240701012101.182784-3-tom@herbertland.com>
Date: Sun, 30 Jun 2024 18:20:56 -0700
From: Tom Herbert <tom@...bertland.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	jesse.brandeburg@...el.com,
	anthony.l.nguyen@...el.com,
	cai.huoqing@...ux.dev,
	netdev@...r.kernel.org,
	felipe@...anda.io
Cc: Tom Herbert <tom@...anda.io>,
	Tom Herbert <tom@...bertland.com>
Subject: [PATCH net-next 2/7] i40e: Don't do TX csum offload with routing header present

From: Tom Herbert <tom@...anda.io>

When determining if the L4 checksum in an IPv6 packet can be offloaded
on transmit, call ipv6_skip_exthdr_no_rthdr to check for the presence
of a routing header. If a routing header is present, that is the
function return less than zero, then don't offload checksum and call
skb_checksum_help instead.

Signed-off-by: Tom Herbert <tom@...bertland.com>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 22 +++++++++------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index c006f716a3bd..b89761e3be7f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -3296,16 +3296,13 @@ static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 
 			l4_proto = ip.v4->protocol;
 		} else if (*tx_flags & I40E_TX_FLAGS_IPV6) {
-			int ret;
-
 			tunnel |= I40E_TX_CTX_EXT_IP_IPV6;
 
 			exthdr = ip.hdr + sizeof(*ip.v6);
 			l4_proto = ip.v6->nexthdr;
-			ret = ipv6_skip_exthdr(skb, exthdr - skb->data,
-					       &l4_proto, &frag_off);
-			if (ret < 0)
-				return -1;
+			if (ipv6_skip_exthdr_no_rthdr(skb, exthdr - skb->data,
+						      &l4_proto, &frag_off) < 0)
+				goto no_csum_offload;
 		}
 
 		/* define outer transport */
@@ -3324,6 +3321,7 @@ static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 			l4.hdr = skb_inner_network_header(skb);
 			break;
 		default:
+no_csum_offload:
 			if (*tx_flags & I40E_TX_FLAGS_TSO)
 				return -1;
 
@@ -3377,9 +3375,10 @@ static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 
 		exthdr = ip.hdr + sizeof(*ip.v6);
 		l4_proto = ip.v6->nexthdr;
-		if (l4.hdr != exthdr)
-			ipv6_skip_exthdr(skb, exthdr - skb->data,
-					 &l4_proto, &frag_off);
+		if (l4.hdr != exthdr &&
+		    ipv6_skip_exthdr_no_rthdr(skb, exthdr - skb->data,
+					      &l4_proto, &frag_off) < 0)
+			goto no_csum_offload;
 	}
 
 	/* compute inner L3 header size */
@@ -3405,10 +3404,7 @@ static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 			  I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
 		break;
 	default:
-		if (*tx_flags & I40E_TX_FLAGS_TSO)
-			return -1;
-		skb_checksum_help(skb);
-		return 0;
+		goto no_csum_offload;
 	}
 
 	*td_cmd |= cmd;
-- 
2.34.1