Several network drivers for chips that support TSO6 share the same code
for preparing the TCP header. A difference is that some reset the
payload_len whilst others don't do this. Let's factor out this common
code to a new helper.
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
include/net/ip6_checksum.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/net/ip6_checksum.h b/include/net/ip6_checksum.h
index 7bec95df4..ef0130023 100644
--- a/include/net/ip6_checksum.h
+++ b/include/net/ip6_checksum.h
@@ -76,6 +76,18 @@ static inline void __tcp_v6_send_check(struct sk_buff *skb,
}
}
+static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb,
+ bool clear_payload_len)
+{
+ struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+ struct tcphdr *th = tcp_hdr(skb);
+
+ if (clear_payload_len)
+ ipv6h->payload_len = 0;
+
+ th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);
+}
+
#if IS_ENABLED(CONFIG_IPV6)
static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
{
--
2.25.0
