[RFC PATCH bpf-next v1 5/7] ice: support the rx_csum XDP metadata hint
From: Vladimir Vdovin <hidden>
Date: 2026-06-30 19:18:08
Also in:
bpf
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Implement xmo_rx_csum from the Rx flex descriptor status0 bits (L3L4P set and no XSUM_L4E), mirroring ice_rx_csum(). Return -ENODATA when RX checksum offload (NETIF_F_RXCSUM) is disabled, since the status bits are not meaningful then. Signed-off-by: Vladimir Vdovin <redacted> --- drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 32 +++++++++++++++++++ 1 file changed, 32 insertions(+)
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index e695a664e53d..d13c5e76bc13 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c@@ -594,8 +594,40 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, __be16 *vlan_proto, return 0; } +/** + * ice_xdp_rx_csum - RX checksum XDP hint handler + * @ctx: XDP buff pointer + * @csum_status: destination for the checksum verdict + * + * Report whether the hardware validated the packet's L4 checksum, mirroring + * the verdict ice_rx_csum() uses for CHECKSUM_UNNECESSARY. Return -ENODATA + * when RX checksum offload is disabled, since the status bits are not + * meaningful then. + */ +static int ice_xdp_rx_csum(const struct xdp_md *ctx, + enum xdp_csum_status *csum_status) +{ + const struct libeth_xdp_buff *xdp_ext = (void *)ctx; + struct ice_rx_ring *rx_ring; + u16 status0; + + rx_ring = libeth_xdp_buff_to_rq(xdp_ext, typeof(*rx_ring), xdp_rxq); + if (!(rx_ring->netdev->features & NETIF_F_RXCSUM)) + return -ENODATA; + + status0 = le16_to_cpu(xdp_ext->desc->wb.status_error0); + if ((status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_L3L4P_S)) && + !(status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_L4E_S))) + *csum_status = XDP_CSUM_VERIFIED; + else + *csum_status = XDP_CSUM_NONE; + + 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, };
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2.47.0