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From: Lorenzo Bianconi <lorenzo@kernel.org>
To: Jakub Sitnicki <jakub@cloudflare.com>
Cc: Donald Hunter <donald.hunter@gmail.com>,
	Jakub Kicinski <kuba@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>,
	Stanislav Fomichev <sdf@fomichev.me>,
	Andrew Lunn <andrew+netdev@lunn.ch>,
	Tony Nguyen <anthony.l.nguyen@intel.com>,
	Przemek Kitszel <przemyslaw.kitszel@intel.com>,
	Alexander Lobakin <aleksander.lobakin@intel.com>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <martin.lau@linux.dev>,
	Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
	Yonghong Song <yonghong.song@linux.dev>,
	KP Singh <kpsingh@kernel.org>, Hao Luo <haoluo@google.com>,
	Jiri Olsa <jolsa@kernel.org>, Shuah Khan <shuah@kernel.org>,
	Maciej Fijalkowski <maciej.fijalkowski@intel.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	intel-wired-lan@lists.osuosl.org,
	linux-kselftest@vger.kernel.org
Subject: Re: [PATCH RFC bpf-next v2 0/5] Add the the capability to load HW RX checsum in eBPF programs
Date: Thu, 25 Sep 2025 12:39:22 +0200	[thread overview]
Message-ID: <aNUb2rB8QAJj-aUX@lore-desk> (raw)
In-Reply-To: <87bjmy508n.fsf@cloudflare.com>

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> 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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WARNING: multiple messages have this Message-ID (diff)
From: Lorenzo Bianconi <lorenzo@kernel.org>
To: Jakub Sitnicki <jakub@cloudflare.com>
Cc: Donald Hunter <donald.hunter@gmail.com>,
	Jakub Kicinski <kuba@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>,
	Stanislav Fomichev <sdf@fomichev.me>,
	Andrew Lunn <andrew+netdev@lunn.ch>,
	Tony Nguyen <anthony.l.nguyen@intel.com>,
	Przemek Kitszel <przemyslaw.kitszel@intel.com>,
	Alexander Lobakin <aleksander.lobakin@intel.com>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <martin.lau@linux.dev>,
	Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
	Yonghong Song <yonghong.song@linux.dev>,
	KP Singh <kpsingh@kernel.org>, Hao Luo <haoluo@google.com>,
	Jiri Olsa <jolsa@kernel.org>, Shuah Khan <shuah@kernel.org>,
	Maciej Fijalkowski <maciej.fijalkowski@intel.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	intel-wired-lan@lists.osuosl.org,
	linux-kselftest@vger.kernel.org
Subject: Re: [Intel-wired-lan] [PATCH RFC bpf-next v2 0/5] Add the the capability to load HW RX checsum in eBPF programs
Date: Thu, 25 Sep 2025 12:39:22 +0200	[thread overview]
Message-ID: <aNUb2rB8QAJj-aUX@lore-desk> (raw)
In-Reply-To: <87bjmy508n.fsf@cloudflare.com>

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> 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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  reply	other threads:[~2025-09-25 10:39 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-25  9:30 [PATCH RFC bpf-next v2 0/5] Add the the capability to load HW RX checsum in eBPF programs Lorenzo Bianconi
2025-09-25  9:30 ` [Intel-wired-lan] " Lorenzo Bianconi
2025-09-25  9:30 ` [PATCH RFC bpf-next v2 1/5] netlink: specs: Add XDP RX checksum capability to XDP metadata specs Lorenzo Bianconi
2025-09-25  9:30   ` [Intel-wired-lan] " Lorenzo Bianconi
2025-09-26  4:20   ` Stanislav Fomichev
2025-09-26  4:20     ` [Intel-wired-lan] " Stanislav Fomichev
2025-09-26  8:59     ` Jesper Dangaard Brouer
2025-09-26  8:59       ` [Intel-wired-lan] " Jesper Dangaard Brouer
2025-09-26 22:53       ` Stanislav Fomichev
2025-09-26 22:53         ` [Intel-wired-lan] " Stanislav Fomichev
2026-02-10 17:26         ` Lorenzo Bianconi
2026-02-10 17:26           ` [Intel-wired-lan] " Lorenzo Bianconi
2026-02-12  1:57           ` Stanislav Fomichev
2026-02-12  1:57             ` [Intel-wired-lan] " Stanislav Fomichev
2026-02-12 16:51             ` Lorenzo Bianconi
2026-02-12 16:51               ` [Intel-wired-lan] " Lorenzo Bianconi
2026-02-13  5:16               ` Stanislav Fomichev
2026-02-13  5:16                 ` [Intel-wired-lan] " Stanislav Fomichev
2026-02-13 15:19                 ` Lorenzo Bianconi
2026-02-13 15:19                   ` [Intel-wired-lan] " Lorenzo Bianconi
2025-09-26  9:53   ` Jesper Dangaard Brouer
2025-09-26  9:53     ` [Intel-wired-lan] " Jesper Dangaard Brouer
2025-09-27  0:35     ` Jakub Kicinski
2025-09-27  0:35       ` [Intel-wired-lan] " Jakub Kicinski
2025-09-27  0:41     ` Jakub Kicinski
2025-09-27  0:41       ` [Intel-wired-lan] " Jakub Kicinski
2025-09-25  9:30 ` [PATCH RFC bpf-next v2 2/5] net: veth: Add xmo_rx_checksum callback to veth driver Lorenzo Bianconi
2025-09-25  9:30   ` [Intel-wired-lan] " Lorenzo Bianconi
2025-09-25  9:30 ` [PATCH RFC bpf-next v2 3/5] net: ice: Add xmo_rx_checksum callback Lorenzo Bianconi
2025-09-25  9:30   ` [Intel-wired-lan] " Lorenzo Bianconi
2025-09-25  9:30 ` [PATCH RFC bpf-next v2 4/5] selftests/bpf: Add selftest support for bpf_xdp_metadata_rx_checksum Lorenzo Bianconi
2025-09-25  9:30   ` [Intel-wired-lan] " Lorenzo Bianconi
2025-09-25  9:30 ` [PATCH RFC bpf-next v2 5/5] selftests/bpf: Add bpf_xdp_metadata_rx_checksum support to xdp_hw_metadat prog Lorenzo Bianconi
2025-09-25  9:30   ` [Intel-wired-lan] " Lorenzo Bianconi
2025-09-25  9:51 ` [PATCH RFC bpf-next v2 0/5] Add the the capability to load HW RX checsum in eBPF programs Jakub Sitnicki
2025-09-25  9:51   ` [Intel-wired-lan] " Jakub Sitnicki
2025-09-25 10:39   ` Lorenzo Bianconi [this message]
2025-09-25 10:39     ` Lorenzo Bianconi
2025-09-25 10:58     ` Jakub Sitnicki
2025-09-25 10:58       ` [Intel-wired-lan] " Jakub Sitnicki
2025-09-26 11:45       ` Jesper Dangaard Brouer
2025-09-26 11:45         ` [Intel-wired-lan] " Jesper Dangaard Brouer
2025-09-26 11:58         ` Jakub Sitnicki
2025-09-26 11:58           ` [Intel-wired-lan] " Jakub Sitnicki
2025-09-26 12:55           ` Lorenzo Bianconi
2025-09-26 12:55             ` [Intel-wired-lan] " Lorenzo Bianconi

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