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net: core: add helper tcp_v6_gso_csum_prep 

Several network drivers for chips that support TSO6 share the same code
for preparing the TCP header, so let's factor it out to a helper.
A difference is that some drivers reset the payload_len whilst others
don't do this. This value is overwritten by TSO anyway, therefore
the new helper resets it in general.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2020-02-18 20:56:41 +01:00 committed by David S. Miller
parent 9cb8e048e5
commit 76eeb12b71
1 changed files with 9 additions and 0 deletions
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9
include/net/ip6_checksum.h
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@ -76,6 +76,15 @@ static inline void __tcp_v6_send_check(struct sk_buff *skb,
}
}
static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb)
{
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
struct tcphdr *th = tcp_hdr(skb);
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)
{