netdev - Re: [PATCH RFC bpf-next v2 0/5] Add the the capability to load HW RX checsum in eBPF programs

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Message-ID: <aNUb2rB8QAJj-aUX@lore-desk>
Date: Thu, 25 Sep 2025 12:39:22 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Jakub Sitnicki <jakub@...udflare.com>
Cc: Donald Hunter <donald.hunter@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	KP Singh <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>, Shuah Khan <shuah@...nel.org>,
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
	netdev@...r.kernel.org, bpf@...r.kernel.org,
	intel-wired-lan@...ts.osuosl.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH RFC bpf-next v2 0/5] Add the the capability to load HW RX
 checsum in eBPF programs

> On Thu, Sep 25, 2025 at 11:30 AM +02, Lorenzo Bianconi wrote:
> > Introduce bpf_xdp_metadata_rx_checksum() kfunc in order to load the HW
> > RX cheksum results in the eBPF program binded to the NIC.
> > Implement xmo_rx_checksum callback for veth and ice drivers.
> 
> What are going to do with HW RX checksum once XDP prog can access it?

Hi Jakub,

I guess there are multiple use-cases for bpf_xdp_metadata_rx_checksum()
kfunc. The first the I have in mind is when packets are received by an af_xdp
application. In this case I think we currently do not have any way to check if
the packet checksum is correct, right?
I think Jesper has other use-cases in mind, I will let him comment here.

Regards,
Lorenzo

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