netdev - Re: [Patch net v2] sit: update dev->needed_headroom in ipip6_tunnel_bind

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Date:   Thu, 27 Apr 2023 08:45:21 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org, Cong Wang <cong.wang@...edance.com>,
        Palash Oswal <oswalpalash@...il.com>,
        Kuniyuki Iwashima <kuniyu@...zon.com>
Subject: Re: [Patch net v2] sit: update dev->needed_headroom in ipip6_tunnel_bind_dev()

On Thu, Apr 27, 2023 at 8:00 AM Cong Wang <xiyou.wangcong@...il.com> wrote:
>
> From: Cong Wang <cong.wang@...edance.com>
>
> When a tunnel device is bound with the underlying device, its
> dev->needed_headroom needs to be updated properly. IPv4 tunnels
> already do the same in ip_tunnel_bind_dev(). Otherwise we may
> not have enough header room for skb, especially after commit
> b17f709a2401 ("gue: TX support for using remote checksum offload option").
>
> Fixes: 32b8a8e59c9c ("sit: add IPv4 over IPv4 support")
> Reported-by: Palash Oswal <oswalpalash@...il.com>
> Link: https://lore.kernel.org/netdev/CAGyP=7fDcSPKu6nttbGwt7RXzE3uyYxLjCSE97J64pRxJP8jPA@mail.gmail.com/
> Cc: Kuniyuki Iwashima <kuniyu@...zon.com>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Cong Wang <cong.wang@...edance.com>
> ---
> v2: follow reverse Christmas tree style
>
> Note, this is targeting for -net and -table, so I'd keep the fix
> small. We can refactor and reuse ip_tunnel_bind_dev() for -net-next.
>
>  net/ipv6/sit.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks.