netdev - [RFC bpf-next v2 13/24] ice: Implement checksum hint

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Date: Wed, 27 Sep 2023 09:51:13 +0200
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: bpf@...r.kernel.org
Cc: Larysa Zaremba <larysa.zaremba@...el.com>,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	song@...nel.org,
	yhs@...com,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...gle.com,
	haoluo@...gle.com,
	jolsa@...nel.org,
	David Ahern <dsahern@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Willem de Bruijn <willemb@...gle.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Anatoly Burakov <anatoly.burakov@...el.com>,
	Alexander Lobakin <alexandr.lobakin@...el.com>,
	Magnus Karlsson <magnus.karlsson@...il.com>,
	Maryam Tahhan <mtahhan@...hat.com>,
	xdp-hints@...-project.net,
	netdev@...r.kernel.org,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Simon Horman <simon.horman@...igine.com>,
	Tariq Toukan <tariqt@...lanox.com>,
	Saeed Mahameed <saeedm@...lanox.com>,
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Subject: [RFC bpf-next v2 13/24] ice: Implement checksum hint

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

Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.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 cc4ba7e995b7..5f12f67af85f 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -647,8 +647,34 @@ 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: 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