netdev - [PATCH net-next v2 04/11] net/ipv6: Remove jumbo

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Message-ID: <20260113212655.116122-5-alice.kernel@fastmail.im>
Date: Tue, 13 Jan 2026 23:26:48 +0200
From: Alice Mikityanska <alice.kernel@...tmail.im>
To: Daniel Borkmann <daniel@...earbox.net>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Xin Long <lucien.xin@...il.com>,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	David Ahern <dsahern@...nel.org>,
	Nikolay Aleksandrov <razor@...ckwall.org>
Cc: Shuah Khan <shuah@...nel.org>,
	Stanislav Fomichev <stfomichev@...il.com>,
	netdev@...r.kernel.org,
	Alice Mikityanska <alice@...valent.com>
Subject: [PATCH net-next v2 04/11] net/ipv6: Remove jumbo_remove step from TX path

From: Alice Mikityanska <alice@...valent.com>

Now that the kernel doesn't insert HBH for BIG TCP IPv6 packets, remove
unnecessary steps from the GSO TX path, that used to check and remove
HBH.

Signed-off-by: Alice Mikityanska <alice@...valent.com>
---
 net/core/dev.c         | 6 ++----
 net/ipv6/ip6_offload.c | 5 +----
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index c711da335510..fb142613ce1a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3800,8 +3800,7 @@ static netdev_features_t gso_features_check(const struct sk_buff *skb,
 	     (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4 &&
 	      vlan_get_protocol(skb) == htons(ETH_P_IPV6))) &&
 	    skb_transport_header_was_set(skb) &&
-	    skb_network_header_len(skb) != sizeof(struct ipv6hdr) &&
-	    !ipv6_has_hopopt_jumbo(skb))
+	    skb_network_header_len(skb) != sizeof(struct ipv6hdr))
 		features &= ~(NETIF_F_IPV6_CSUM | NETIF_F_TSO6 | NETIF_F_GSO_UDP_L4);
 
 	return features;
@@ -3904,8 +3903,7 @@ int skb_csum_hwoffload_help(struct sk_buff *skb,
 
 	if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) {
 		if (vlan_get_protocol(skb) == htons(ETH_P_IPV6) &&
-		    skb_network_header_len(skb) != sizeof(struct ipv6hdr) &&
-		    !ipv6_has_hopopt_jumbo(skb))
+		    skb_network_header_len(skb) != sizeof(struct ipv6hdr))
 			goto sw_checksum;
 
 		switch (skb->csum_offset) {
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index e5861089cc80..3252a9c2ad58 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -110,7 +110,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 	struct sk_buff *segs = ERR_PTR(-EINVAL);
 	struct ipv6hdr *ipv6h;
 	const struct net_offload *ops;
-	int proto, err;
+	int proto;
 	struct frag_hdr *fptr;
 	unsigned int payload_len;
 	u8 *prevhdr;
@@ -120,9 +120,6 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 	bool gso_partial;
 
 	skb_reset_network_header(skb);
-	err = ipv6_hopopt_jumbo_remove(skb);
-	if (err)
-		return ERR_PTR(err);
 	nhoff = skb_network_header(skb) - skb_mac_header(skb);
 	if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 		goto out;
-- 
2.52.0