netdev - [PATCH 12/15] ice: Implement checksum level hint

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Date: Fri, 12 May 2023 17:16:36 +0200
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: bpf@...r.kernel.org
Cc: Larysa Zaremba <larysa.zaremba@...el.com>,
	Stanislav Fomichev <sdf@...gle.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Jakub Kicinski <kuba@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Anatoly Burakov <anatoly.burakov@...el.com>,
	Jesper Dangaard Brouer <brouer@...hat.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,
	intel-wired-lan@...ts.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 12/15] ice: Implement checksum level hint

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@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 24 ++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 39547feb6106..6a3ec925f20d 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -161,6 +161,8 @@ ice_rx_csum_checked(union ice_32b_rx_flex_desc *rx_desc, u16 ptype,
 	 */
 	if (decoded.tunnel_type >= ICE_RX_PTYPE_TUNNEL_IP_GRENAT)
 		*csum_lvl_dst = 1;
+	else
+		*csum_lvl_dst = 0;
 
 	/* Only report checksum unnecessary for TCP, UDP, or SCTP */
 	switch (decoded.inner_prot) {
@@ -190,7 +192,7 @@ static void
 ice_rx_csum_into_skb(struct ice_rx_ring *ring, struct sk_buff *skb,
 		     union ice_32b_rx_flex_desc *rx_desc, u16 ptype)
 {
-	u8 csum_level = 0;
+	u8 csum_level;
 
 	/* Start with CHECKSUM_NONE and by default csum_level = 0 */
 	skb->ip_summed = CHECKSUM_NONE;
@@ -669,9 +671,29 @@ static int ice_xdp_rx_stag(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;
+	u16 ptype = ice_get_ptype(xdp_ext->eop_desc);
+
+	if (!ice_rx_csum_checked(xdp_ext->eop_desc, ptype, csum_lvl,
+				 xdp_ext->rx_ring))
+		return -EOPNOTSUPP;
+
+	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_ctag			= ice_xdp_rx_ctag,
 	.xmo_rx_stag			= ice_xdp_rx_stag,
+	.xmo_rx_csum_lvl		= ice_xdp_rx_csum_lvl,
 };
-- 
2.35.3