linux-kernel - Re: [PATCH net-next 2/3] r8169: use new helper tcp_v6_gso_csum

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Date:   Tue, 18 Feb 2020 19:45:53 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     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>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
        linux-hyperv@...r.kernel.org,
        Linux USB Mailing List <linux-usb@...r.kernel.org>
Subject: Re: [PATCH net-next 2/3] r8169: use new helper tcp_v6_gso_csum_prep

On 18.02.2020 19:37, Alexander Duyck wrote:
> On Mon, Feb 17, 2020 at 1:42 PM Heiner Kallweit <hkallweit1@...il.com> wrote:
>>
>> Simplify the code by using new helper tcp_v6_gso_csum_prep.
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
>> ---
>>  drivers/net/ethernet/realtek/r8169_main.c | 26 ++---------------------
>>  1 file changed, 2 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
>> index 5a9143b50..75ba10069 100644
>> --- a/drivers/net/ethernet/realtek/r8169_main.c
>> +++ b/drivers/net/ethernet/realtek/r8169_main.c
>> @@ -4108,29 +4108,6 @@ static bool rtl_test_hw_pad_bug(struct rtl8169_private *tp, struct sk_buff *skb)
>>         return skb->len < ETH_ZLEN && tp->mac_version == RTL_GIGA_MAC_VER_34;
>>  }
>>
>> -/* msdn_giant_send_check()
>> - * According to the document of microsoft, the TCP Pseudo Header excludes the
>> - * packet length for IPv6 TCP large packets.
>> - */
>> -static int msdn_giant_send_check(struct sk_buff *skb)
>> -{
>> -       const struct ipv6hdr *ipv6h;
>> -       struct tcphdr *th;
>> -       int ret;
>> -
>> -       ret = skb_cow_head(skb, 0);
>> -       if (ret)
>> -               return ret;
>> -
>> -       ipv6h = ipv6_hdr(skb);
>> -       th = tcp_hdr(skb);
>> -
>> -       th->check = 0;
>> -       th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);
>> -
>> -       return ret;
>> -}
>> -
>>  static void rtl8169_tso_csum_v1(struct sk_buff *skb, u32 *opts)
>>  {
>>         u32 mss = skb_shinfo(skb)->gso_size;
>> @@ -4163,9 +4140,10 @@ static bool rtl8169_tso_csum_v2(struct rtl8169_private *tp,
>>                         break;
>>
>>                 case htons(ETH_P_IPV6):
>> -                       if (msdn_giant_send_check(skb))
>> +                       if (skb_cow_head(skb, 0))
>>                                 return false;
>>
>> +                       tcp_v6_gso_csum_prep(skb, false);
>>                         opts[0] |= TD1_GTSENV6;
>>                         break;
>>
> 
> This change looks more or less identical to the one you made in
> "drivers/net/usb/r8152.c" for patch 3. If you have to resubmit it
> might make sense to pull that change out and include it here since
> they are both essentially the same change.
> 
Right, it's the same change. I just treated r8169 separately because
I happen to be maintainer of it.