netdev - Re: [RFC bpf-next v1 3/7] bpf: Support pulling non-linear xdp data

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Message-ID: <20250825173035.7654531c@kernel.org>
Date: Mon, 25 Aug 2025 17:30:35 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Stanislav Fomichev <stfomichev@...il.com>
Cc: Amery Hung <ameryhung@...il.com>, bpf@...r.kernel.org,
 netdev@...r.kernel.org, alexei.starovoitov@...il.com, andrii@...nel.org,
 daniel@...earbox.net, martin.lau@...nel.org, mohsin.bashr@...il.com,
 saeedm@...dia.com, tariqt@...dia.com, mbloch@...dia.com,
 maciej.fijalkowski@...el.com, kernel-team@...a.com
Subject: Re: [RFC bpf-next v1 3/7] bpf: Support pulling non-linear xdp data

On Mon, 25 Aug 2025 17:12:13 -0700 Stanislav Fomichev wrote:
> > > The unreadable frags will always be unredabale to the host. This is TCP
> > > device memory, the memory on the accelerators that is not mapped onto
> > > the CPU. Any attempts to read that memory should gracefully error out.
> > > 
> > > Can you also pls fix that other one? (not as part of the series should
> > > be ok)  
> > 
> > But we don't support mixing XDP with unreadable mem today.
> > Is the concern just for future proofing?  
> 
> Good point. I though we did add that proofing during the initial rx
> patch series, but I don't see any. Ignore me!

I could be wrong, but I think we did for skb paths only.
Perhaps you're thinking about those helpers.