netdev - [PATCH bpf-next v2 20/20] selftests/bpf: check checksum level in xdp

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Date: Mon,  3 Jul 2023 20:12:26 +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
Subject: [PATCH bpf-next v2 20/20] selftests/bpf: check checksum level in xdp_metadata

Verify, whether kfunc in xdp_metadata test correctly returns checksum level
of zero.

Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>
---
 tools/testing/selftests/bpf/prog_tests/xdp_metadata.c | 3 +++
 tools/testing/selftests/bpf/progs/xdp_metadata.c      | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index 50ac9f570bc5..6c71d712932e 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
@@ -228,6 +228,9 @@ static int verify_xsk_metadata(struct xsk *xsk)
 	if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
 		return -1;
 
+	if (!ASSERT_NEQ(meta->rx_csum_lvl, 0, "rx_csum_lvl"))
+		return -1;
+
 	xsk_ring_cons__release(&xsk->rx, 1);
 	refill_rx(xsk, comp_addr);
 
diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
index 382984a5d1c9..6f7223d581b7 100644
--- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
@@ -26,6 +26,8 @@ extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
 extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
 					__u16 *vlan_tag,
 					__be16 *vlan_proto) __ksym;
+extern int bpf_xdp_metadata_rx_csum_lvl(const struct xdp_md *ctx,
+					__u8 *csum_level) __ksym;
 
 SEC("xdp")
 int rx(struct xdp_md *ctx)
@@ -62,6 +64,11 @@ int rx(struct xdp_md *ctx)
 	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
 	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tag, &meta->rx_vlan_proto);
 
+	/* Same as with timestamp, zero is expected */
+	ret = bpf_xdp_metadata_rx_csum_lvl(ctx, &meta->rx_csum_lvl);
+	if (!ret && meta->rx_csum_lvl == 0)
+		meta->rx_csum_lvl = 1;
+
 	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
 }
 
-- 
2.41.0