[PATCH RFC bpf-next 3/6] veth: Add xmo_rx_checksum callback to veth driver

[Lorenzo Bianconi <lorenzo@kernel.org>]

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

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/veth.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index a3046142cb8e2658a30041129f8d298e5e0a5822..2a762cb132fd9fd90376965c65c4fedcc28a26c8 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1692,6 +1692,24 @@ 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, u8 *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,
@@ -1717,6 +1735,7 @@ 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 | \

-- 
2.51.0