RE: [Intel-wired-lan] [PATCH bpf-next 4/5] selftests/bpf: Add selftest support for bpf_xdp_metadata_rx_checksum

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From: Intel-wired-lan <redacted> On Behalf
Of Lorenzo Bianconi
Sent: Tuesday, February 10, 2026 6:22 PM
To: Donald Hunter <donald.hunter@gmail.com>; Jakub Kicinski
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Cc: Jakub Sitnicki <jakub@cloudflare.com>; netdev@vger.kernel.org;
bpf@vger.kernel.org; intel-wired-lan@lists.osuosl.org; linux-
kselftest@vger.kernel.org; Lorenzo Bianconi [off-list ref]
Subject: [Intel-wired-lan] [PATCH bpf-next 4/5] selftests/bpf: Add
selftest support for bpf_xdp_metadata_rx_checksum

Introduce support to xdp_metadata selftest for
bpf_xdp_metadata_rx_checksum kfunc.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 tools/testing/selftests/bpf/prog_tests/xdp_metadata.c | 7 +++++++
 tools/testing/selftests/bpf/progs/xdp_metadata.c      | 1 +
 tools/testing/selftests/bpf/xdp_metadata.h            | 9 +++++++++
 3 files changed, 17 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c

b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index
19f92affc2daa23fdd869554e7a0475b86350a4f..707c98e664745763b01b638a537a
797211ded4e1 100644

--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c

@@ -258,6 +258,7 @@ static void refill_rx(struct xsk *xsk, __u64 addr)

 static int verify_xsk_metadata(struct xsk *xsk, bool

sent_from_af_xdp)  {
+	__u8 ip_summed = sent_from_af_xdp ? XDP_CHECKSUM_NONE :
+XDP_CHECKSUM_PARTIAL;
 	const struct xdp_desc *rx_desc;
 	struct pollfd fds = {};
 	struct xdp_meta *meta;

@@ -310,6 +311,12 @@ static int verify_xsk_metadata(struct xsk *xsk,

bool sent_from_af_xdp)
 	if (!ASSERT_NEQ(meta->rx_hash, 0, "rx_hash"))
 		return -1;

+	if (!ASSERT_EQ(meta->ip_summed, ip_summed, "rx_ip_summed"))
+		return -1;
+
+	if (!ASSERT_EQ(meta->cksum_meta, 0, "rx_cksum_meta"))
+		return -1;
+
 	if (!sent_from_af_xdp) {
 		if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0,
"rx_hash_type"))
 			return -1;

diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c

b/tools/testing/selftests/bpf/progs/xdp_metadata.c
index
09bb8a038d528cf26c5b314cc927915ac2796bf0..ef6a5584a1876a3c47440f21dca9
27ec783469dc 100644

--- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c

@@ -98,6 +98,7 @@ int rx(struct xdp_md *ctx)
 	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta-

quoted

rx_hash_type);

 	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_proto,
 				     &meta->rx_vlan_tci);
+	bpf_xdp_metadata_rx_checksum(ctx, &meta->ip_summed,
+&meta->cksum_meta);

 	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
} diff --git a/tools/testing/selftests/bpf/xdp_metadata.h
b/tools/testing/selftests/bpf/xdp_metadata.h
index
87318ad1117a1d677af121f11778178532e2a562..a16f71488a34e6df23fec6dd7dde
7b7989774618 100644

--- a/tools/testing/selftests/bpf/xdp_metadata.h
+++ b/tools/testing/selftests/bpf/xdp_metadata.h

@@ -30,6 +30,11 @@ enum xdp_meta_field {
 	XDP_META_FIELD_VLAN_TAG	= BIT(2),
 };

+#define XDP_CHECKSUM_NONE		0
+#define XDP_CHECKSUM_UNNECESSARY	1
+#define XDP_CHECKSUM_COMPLETE		2
+#define XDP_CHECKSUM_PARTIAL		3
+
 struct xdp_meta {
 	union {
 		__u64 rx_timestamp;

@@ -48,5 +53,9 @@ struct xdp_meta {
 		};
 		__s32 rx_vlan_tag_err;
 	};
+	struct {
+		__u8 ip_summed;
+		__u32 cksum_meta;
+	};
 	enum xdp_meta_field hint_valid;
 };

--

2.53.0