netdev - Re: [RFC net-next] udp: add a GSO type for UDPv6

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Date:   Wed, 2 Sep 2020 16:33:13 +0200
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Huazhong Tan <tanhuazhong@...wei.com>
Cc:     David Miller <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        salil.mehta@...wei.com, yisen.zhuang@...wei.com,
        linuxarm@...wei.com, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [RFC net-next] udp: add a GSO type for UDPv6

On Wed, Sep 2, 2020 at 2:18 PM Huazhong Tan <tanhuazhong@...wei.com> wrote:
>
> In some cases, for UDP GSO, UDPv4 and UDPv6 need to be handled
> separately, for example, checksum offload, so add new GSO type
> SKB_GSO_UDPV6_L4 for UDPv6, and the old SKB_GSO_UDP_L4 stands
> for UDPv4.

This is in preparation for hardware you have that actually cares about
this distinction, I guess?


> diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
> index 2cc3cf8..b7c1a76 100644
> --- a/include/linux/netdev_features.h
> +++ b/include/linux/netdev_features.h
> @@ -54,6 +54,7 @@ enum {
>         NETIF_F_GSO_UDP_BIT,            /* ... UFO, deprecated except tuntap */
>         NETIF_F_GSO_UDP_L4_BIT,         /* ... UDP payload GSO (not UFO) */
>         NETIF_F_GSO_FRAGLIST_BIT,               /* ... Fraglist GSO */
> +       NETIF_F_GSO_UDPV6_L4_BIT,       /* ... UDPv6 payload GSO (not UFO) */
>         /**/NETIF_F_GSO_LAST =          /* last bit, see GSO_MASK */
>                 NETIF_F_GSO_FRAGLIST_BIT,

Need to update NETIF_F_GSO_LAST then, too.