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Date:   Thu, 8 Oct 2020 18:01:35 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Michael Tuexen <tuexen@...muenster.de>,
        davem <davem@...emloft.net>, Tom Herbert <tom@...bertland.com>
Subject: Re: [PATCHv2 net-next 04/17] udp: support sctp over udp in skb_udp_tunnel_segment

CCing Tom Herbert

On Thu, Oct 8, 2020 at 5:48 PM Xin Long <lucien.xin@...il.com> wrote:
>
> To call sctp_gso_segment() properly in skb_udp_tunnel_segment() for sctp
> over udp packets, we need to set transport_header to sctp header. When
> skb->ip_summed == CHECKSUM_PARTIAL, skb_crc32c_csum_help() should be
> called for the inner sctp packet.
>
> Cc: Tom Herbert <tom@...bertland.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> ---
>  net/ipv4/udp_offload.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
> index c0b010b..a484405 100644
> --- a/net/ipv4/udp_offload.c
> +++ b/net/ipv4/udp_offload.c
> @@ -49,6 +49,7 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
>         __skb_pull(skb, tnl_hlen);
>         skb_reset_mac_header(skb);
>         skb_set_network_header(skb, skb_inner_network_offset(skb));
> +       skb_set_transport_header(skb, skb_inner_transport_offset(skb));
>         skb->mac_len = skb_inner_network_offset(skb);
>         skb->protocol = new_protocol;
>
> @@ -131,8 +132,12 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
>                 uh->check = ~csum_fold(csum_add(partial,
>                                        (__force __wsum)htonl(len)));
>
> -               if (skb->encapsulation)
> -                       skb_checksum_help(skb);
> +               if (skb->encapsulation) {
> +                       if (skb->csum_not_inet)
> +                               skb_crc32c_csum_help(skb);
> +                       else
> +                               skb_checksum_help(skb);
> +               }
>
>                 if (offload_csum) {
>                         skb->ip_summed = CHECKSUM_PARTIAL;
> --
> 2.1.0
>

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