netdev - Re: [PATCH v2 net-next 08/14] ipv6: Add hop-by-hop header to jumbograms in ip6

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Message-ID: <0926b40f-f66b-5cca-cd9b-ba9800d21388@kernel.org>
Date:   Sat, 5 Mar 2022 12:06:50 -0700
From:   David Ahern <dsahern@...nel.org>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>, Coco Li <lixiaoyan@...gle.com>,
        Alexander Duyck <alexanderduyck@...com>
Subject: Re: [PATCH v2 net-next 08/14] ipv6: Add hop-by-hop header to
 jumbograms in ip6_output

On 3/5/22 11:08 AM, Eric Dumazet wrote:
>>
>> Why? skb->len is not limited to a u16. The only affect is when skb->len
>> is used to fill in the ipv4/ipv6 header.
> 
> Seriously ?
> 
> Have you looked recently at core networking stack, and have you read
> my netdev presentation ?

yes I have.

> 
> Core networking stack will trim your packets skb->len based on what is
> found in the network header,

Core networking stack is s/w under our control; much more complicated
and intricate changes have been made.