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Subject: [PATCH net-next v2 01/13] net: core: add helper tcp_v6_gso_csum_prep
From:   Heiner Kallweit <hkallweit1@gmail.com>
To:     David Miller <davem@davemloft.net>,
        Realtek linux nic maintainers <nic_swsd@realtek.com>,
        Jay Cliburn <jcliburn@gmail.com>,
        Chris Snook <chris.snook@gmail.com>,
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        Sudarsana Kalluru <skalluru@marvell.com>,
        GR-Linux-NIC-Dev@marvell.com,
        Christian Benvenuti <benve@cisco.com>,
        Govindarajulu Varadarajan <_govind@gmx.com>,
        Parvi Kaustubhi <pkaustub@cisco.com>,
        Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
        Guo-Fu Tseng <cooldavid@cooldavid.org>,
        Shannon Nelson <snelson@pensando.io>,
        Pensando Drivers <drivers@pensando.io>,
        Timur Tabi <timur@kernel.org>,
        Jassi Brar <jaswinder.singh@linaro.org>,
        Ilias Apalodimas <ilias.apalodimas@linaro.org>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Sasha Levin <sashal@kernel.org>,
        Ronak Doshi <doshir@vmware.com>,
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Cc:     "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
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Date:   Tue, 18 Feb 2020 20:56:41 +0100
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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>
---
 include/net/ip6_checksum.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/net/ip6_checksum.h b/include/net/ip6_checksum.h
index 7bec95df4..27ec612cd 100644
--- a/include/net/ip6_checksum.h
+++ b/include/net/ip6_checksum.h
@@ -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)
 {
-- 
2.25.1