netdev - Re: [PATCH net-next v2 08/12] gtp: set dev features to enable GSO

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Date:   Sun, 13 Dec 2020 10:25:54 -0800
From:   Pravin Shelar <pravin.ovn@...il.com>
To:     Jonas Bonn <jonas@...rbonn.se>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Pablo Neira Ayuso <pablo@...filter.org>, laforge@...monks.org
Subject: Re: [PATCH net-next v2 08/12] gtp: set dev features to enable GSO

On Fri, Dec 11, 2020 at 11:50 PM Jonas Bonn <jonas@...rbonn.se> wrote:
>
>
>
> On 12/12/2020 06:31, Pravin Shelar wrote:
> > On Fri, Dec 11, 2020 at 4:28 AM Jonas Bonn <jonas@...rbonn.se> wrote:
> >>
> >> Signed-off-by: Jonas Bonn <jonas@...rbonn.se>
> >> ---
> >>   drivers/net/gtp.c | 8 +++++++-
> >>   1 file changed, 7 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
> >> index 236ebbcb37bf..7bbeec173113 100644
> >> --- a/drivers/net/gtp.c
> >> +++ b/drivers/net/gtp.c
> >> @@ -536,7 +536,11 @@ static int gtp_xmit_ip4(struct sk_buff *skb, struct net_device *dev)
> >>          if (unlikely(r))
> >>                  goto err_rt;
> >>
> >> -       skb_reset_inner_headers(skb);
> >> +       r = udp_tunnel_handle_offloads(skb, true);
> >> +       if (unlikely(r))
> >> +               goto err_rt;
> >> +
> >> +       skb_set_inner_protocol(skb, skb->protocol);
> >>
> > This should be skb_set_inner_ipproto(), since GTP is L3 protocol.
>
> I think you're right, but I barely see the point of this.  It all ends
> up in the same place, as far as I can tell.  Is this supposed to be some
> sort of safeguard against trying to offload tunnels-in-tunnels?
>

In UDP offload this flag is used to process segments. With correct
flag GTP offload handling can directly jump to L3 processing.