netdev - [PATCH net-next 7/7] fm10k: Don't do TX csum offload with routing header present

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Date: Sun, 30 Jun 2024 18:21:01 -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 7/7] fm10k: 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/fm10k/fm10k_main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
index fc373472e4e1..b422fe7be427 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
@@ -832,9 +832,11 @@ static void fm10k_tx_csum(struct fm10k_ring *tx_ring,
 		if (likely((transport_hdr - network_hdr.raw) ==
 			   sizeof(struct ipv6hdr)))
 			break;
-		ipv6_skip_exthdr(skb, network_hdr.raw - skb->data +
-				      sizeof(struct ipv6hdr),
-				 &l4_hdr, &frag_off);
+		if (ipv6_skip_exthdr_no_rthdr(skb, network_hdr.raw - skb->data +
+					      sizeof(struct ipv6hdr),
+					      &l4_hdr, &frag_off) < 0)
+			goto no_csum_offload;
+
 		if (unlikely(frag_off))
 			l4_hdr = NEXTHDR_FRAGMENT;
 		break;
@@ -851,6 +853,7 @@ static void fm10k_tx_csum(struct fm10k_ring *tx_ring,
 			break;
 		fallthrough;
 	default:
+no_csum_offload:
 		if (unlikely(net_ratelimit())) {
 			dev_warn(tx_ring->dev,
 				 "partial checksum, version=%d l4 proto=%x\n",
-- 
2.34.1