[xdp-hints] [PATCH bpf-next v2 13/20] ice: Implement checksum level hint

[Larysa Zaremba <larysa.zaremba@intel.com>]

Implement .xmo_rx_csum_lvl callback to allow XDP code to determine,
whether checksum was checked by hardware and on what level.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index e9f334fecdf1..41ab52b6990d 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -660,8 +660,34 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tag,
 	return 0;
 }
 
+/**
+ * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
+ * @ctx: XDP buff pointer
+ * @csum_lvl: destination address
+ *
+ * Copy HW checksum level (if was checked) to the destination address.
+ */
+static int ice_xdp_rx_csum_lvl(const struct xdp_md *ctx, u8 *csum_lvl)
+{
+	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
+	const union ice_32b_rx_flex_desc *eop_desc;
+	enum ice_rx_csum_status status;
+	u16 ptype;
+
+	eop_desc = xdp_ext->pkt_ctx.eop_desc;
+	ptype = ice_get_ptype(eop_desc);
+
+	status = ice_get_rx_csum_status(eop_desc, ptype);
+	if (status & ICE_RX_CSUM_NONE)
+		return -ENODATA;
+
+	*csum_lvl = ice_rx_csum_lvl(status);
+	return 0;
+}
+
 const struct xdp_metadata_ops ice_xdp_md_ops = {
 	.xmo_rx_timestamp		= ice_xdp_rx_hw_ts,
 	.xmo_rx_hash			= ice_xdp_rx_hash,
 	.xmo_rx_vlan_tag		= ice_xdp_rx_vlan_tag,
+	.xmo_rx_csum_lvl		= ice_xdp_rx_csum_lvl,
 };
-- 
2.41.0