RE: [Intel-wired-lan] [PATCH bpf-next 2/5] net: veth: Add xmo_rx_checksum callback to veth driver

-----Original Message-----
From: Intel-wired-lan <redacted> On Behalf
Of Lorenzo Bianconi
Sent: Tuesday, February 10, 2026 6:22 PM
To: Donald Hunter <donald.hunter@gmail.com>; Jakub Kicinski
[off-list ref]; David S. Miller [off-list ref]; Eric Dumazet
[off-list ref]; Paolo Abeni [off-list ref]; Simon Horman
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Borkmann [off-list ref]; Jesper Dangaard Brouer
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Stanislav Fomichev [off-list ref]; Andrew Lunn
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[off-list ref]; Kitszel, Przemyslaw
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Martin KaFai Lau [off-list ref]; Eduard Zingerman
[off-list ref]; Song Liu [off-list ref]; Yonghong Song
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Cc: Jakub Sitnicki <jakub@cloudflare.com>; netdev@vger.kernel.org;
bpf@vger.kernel.org; intel-wired-lan@lists.osuosl.org; linux-
kselftest@vger.kernel.org; Lorenzo Bianconi [off-list ref]
Subject: [Intel-wired-lan] [PATCH bpf-next 2/5] net: veth: Add
xmo_rx_checksum callback to veth driver

Implement xmo_rx_checksum callback in veth driver to report RX
checksum result to the eBPF program bounded to the veth device.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/veth.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c index

14e6f2a2fb7783334d8f6afd54e658cf9a0e6f3d..38b70ad62db7e92cccc6c6c9ed1f
5573d8baf48b 100644

--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c

@@ -1693,6 +1693,25 @@ static int veth_xdp_rx_vlan_tag(const struct

xdp_md *ctx, __be16 *vlan_proto,
 	return err;
 }

+static int veth_xdp_rx_checksum(const struct xdp_md *ctx,
+				enum xdp_checksum *ip_summed,
+				u32 *cksum_meta)
+{
+	const struct veth_xdp_buff *_ctx = (void *)ctx;
+	const struct sk_buff *skb = _ctx->skb;
+
+	if (!skb)
+		return -ENODATA;
+
+	/* For locally generated packets ip_summed is set to
+	 * CHECKSUM_PARTIAL.
+	 */
+	*ip_summed = skb->ip_summed;
+	*cksum_meta = 0;
+
+	return 0;
+}
+
 static const struct net_device_ops veth_netdev_ops = {
 	.ndo_init            = veth_dev_init,
 	.ndo_open            = veth_open,

@@ -1718,6 +1737,7 @@ static const struct xdp_metadata_ops

veth_xdp_metadata_ops = {
 	.xmo_rx_timestamp		= veth_xdp_rx_timestamp,
 	.xmo_rx_hash			= veth_xdp_rx_hash,
 	.xmo_rx_vlan_tag		= veth_xdp_rx_vlan_tag,
+	.xmo_rx_checksum		= veth_xdp_rx_checksum,
 };

 #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST |
NETIF_F_HW_CSUM | \

--
2.53.0