Subject: Re: [PATCH RFC bpf-next v2 1/5] netlink: specs: Add XDP RX checksum capability to XDP metadata specs

From: Jakub Kicinski <[email-masked]>
Date: Fri, 26 Sep 2025 17:35:39 -0700

On Fri, 26 Sep 2025 11:53:25 +0200 Jesper Dangaard Brouer wrote:
> > + * In case of success, ``cksum_meta`` contains the hw computed checksum value
> > + * for ``XDP_CHECKSUM_COMPLETE`` or the ``csum_level`` for
> > + * ``XDP_CHECKSUM_UNNECESSARY``. It is set to 0 for ``XDP_CHECKSUM_NONE`` and
> > + * ``XDP_CHECKSUM_PARTIAL``.
> > + *  
> 
> It is very important that we explain the meaning of XDP_CHECKSUM_NONE.
> As I hinted in other email, this also covers the non-existing FAIL case.

Good idea, perhaps we should add this to the big comment about
checksums in skbuff.h and point to that? Avoid the duplication?