linux-kernel - [PATCH net-next 1/3] net: core: add helper tcp_v6_gso_csum

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Date:   Mon, 17 Feb 2020 22:40:10 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        Jay Cliburn <jcliburn@...il.com>,
        Chris Snook <chris.snook@...il.com>,
        Rasesh Mody <rmody@...vell.com>,
        Sudarsana Kalluru <skalluru@...vell.com>,
        GR-Linux-NIC-Dev@...vell.com,
        Christian Benvenuti <benve@...co.com>,
        Govindarajulu Varadarajan <_govind@....com>,
        Parvi Kaustubhi <pkaustub@...co.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Guo-Fu Tseng <cooldavid@...ldavid.org>,
        Shannon Nelson <snelson@...sando.io>,
        Pensando Drivers <drivers@...sando.io>,
        Timur Tabi <timur@...nel.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        Ronak Doshi <doshir@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        intel-wired-lan@...ts.osuosl.org, linux-hyperv@...r.kernel.org,
        Linux USB Mailing List <linux-usb@...r.kernel.org>
Subject: [PATCH net-next 1/3] 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. 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@...il.com>
---
 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