[RFC bpf-next 17/23] veth: Implement VLAN tag and checksum XDP hint

Larysa Zaremba
2023-08-24T19:34:31Z

In order to test VLAN tag and checksum XDP hints in hardware-independent
selftests, implement newly added XDP hints in veth driver.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
drivers/net/veth.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 953f6d8f8db0..f3ee85aa5edf 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1732,6 +1732,46 @@ static int veth_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
return 0;
}

+static int veth_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
+ __be16 *vlan_proto)
+{
+ struct veth_xdp_buff *_ctx = (void *)ctx;
+ struct sk_buff *skb = _ctx->skb;
+ int err;
+
+ if (!skb)
+ return -ENODATA;
+
+ err = __vlan_hwaccel_get_tag(skb, vlan_tci);
+ if (err)
+ return err;
+
+ *vlan_proto = skb->vlan_proto;
+ return err;
+}
+
+static int veth_xdp_rx_csum(const struct xdp_md *ctx,
+ enum xdp_csum_status *csum_status,
+ __wsum *csum)
+{
+ struct veth_xdp_buff *_ctx = (void *)ctx;
+ struct sk_buff *skb = _ctx->skb;
+
+ if (!skb)
+ return -ENODATA;
+
+ if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
+ *csum_status = XDP_CHECKSUM_VERIFIED;
+ } else if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ *csum_status = XDP_CHECKSUM_COMPLETE;
+ *csum = skb->csum;
+ } else {
+ return -ENODATA;
+ }
+
+ return 0;
+}
+
static const struct net_device_ops veth_netdev_ops = {
.ndo_init = veth_dev_init,
.ndo_open = veth_open,
@@ -1756,6 +1796,8 @@ static const struct net_device_ops veth_netdev_ops = {
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_csum = veth_xdp_rx_csum,
};

#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
--
2.41.0