Re: [PATCH bpf v4 0/9] Address XDP frags having negative tailroom

[Larysa Zaremba]

On Wed, Mar 04, 2026 at 06:55:31PM -0800, Jakub Kicinski wrote:
> On Mon,  2 Mar 2026 17:17:13 +0100 Larysa Zaremba wrote:
> > Aside from the issue described below, tailroom calculation does not account
> > for pages being split between frags, e.g. in i40e, enetc and
> > AF_XDP ZC with smaller chunks. These series address the problem by
> > calculating modulo (skb_frag_off() % rxq->frag_size) in order to get
> > data offset within a smaller block of memory. Please note, xskxceiver
> > tail grow test passes without modulo e.g. in xdpdrv mode on i40e,
> > because there is not enough descriptors to get to flipped buffers.
> 
> This was re-assigned to netdev in pw, I presume by BPF maintainers.
> But it doesn't apply to net. There's a conflict in ice.
> Could you rebase on net and repost?
> 

I have just sent v5 with net as a base tree, had to fix one other thing anyway.