linux-kernel - Re: [PATCH net-next v3] xdp: Add helpers for head length, headroom, and metadata length

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c8ad3f65-f70e-4c6e-9231-0ae709e87bfe@kernel.org>
Date: Wed, 7 May 2025 18:35:47 +0200
From: Jesper Dangaard Brouer <hawk@...nel.org>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>,
 Stanislav Fomichev <stfomichev@...il.com>, Jon Kohler <jon@...anix.com>
Cc: Jason Wang <jasowang@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 John Fastabend <john.fastabend@...il.com>, Simon Horman <horms@...nel.org>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
 Jacob Keller <jacob.e.keller@...el.com>
Subject: Re: [PATCH net-next v3] xdp: Add helpers for head length, headroom,
 and metadata length

On 07/05/2025 15.29, Willem de Bruijn wrote:
> Stanislav Fomichev wrote:
>> On 05/06, Jon Kohler wrote:
>>> Introduce new XDP helpers:
>>> - xdp_headlen: Similar to skb_headlen

I really dislike xdp_headlen().  This "headlen" originates from an SKB
implementation detail, that I don't think we should carry over into XDP
land.
We need to come up with something that isn't easily mis-read as the 
header-length.

>>> - xdp_headroom: Similar to skb_headroom
>>> - xdp_metadata_len: Similar to skb_metadata_len
>>>

I like naming of these.

>>> Integrate these helpers into tap, tun, and XDP implementation to start.
>>>
>>> No functional changes introduced.
>>>
>>> Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
>>> Signed-off-by: Jon Kohler <jon@...anix.com>
>>> ---
>>> v2->v3: Integrate feedback from Stanislav
>>> https://patchwork.kernel.org/project/netdevbpf/patch/20250430201120.1794658-1-jon@nutanix.com/
>>
>> Acked-by: Stanislav Fomichev <sdf@...ichev.me>
> 
> Reviewed-by: Willem de Bruijn <willemb@...gle.com>
> 

Nacked-by: Jesper Dangaard Brouer <hawk@...nel.org>

pw: cr