[RFC bpf-next 13/23] ice: Implement checksum hint

Larysa Zaremba
2023-08-24T19:34:23Z

Implement .xmo_rx_csum callback to allow XDP code to determine,
whether HW has validated any checksums.

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 6ae57a98a4d8..f11a245705bc 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_tci,
return 0;
}

+/**
+ * ice_xdp_rx_csum - RX checksum XDP hint handler
+ * @ctx: XDP buff pointer
+ * @csum_status: status destination address
+ * @csum: not used
+ */
+static int ice_xdp_rx_csum(const struct xdp_md *ctx,
+ enum xdp_csum_status *csum_status, __wsum *csum)
+{
+ 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_FAIL)
+ return -ENODATA;
+
+ *csum_status = XDP_CHECKSUM_VERIFIED;
+ 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 = ice_xdp_rx_csum,
};
--
2.41.0