[xdp-hints] [RFC bpf-next v2 22/24] selftests/bpf: check checksum state in xdp_metadata

[Larysa Zaremba <larysa.zaremba@intel.com>]

Verify, whether kfunc in xdp_metadata test correctly represent veth
metadata state.

Acked-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 tools/testing/selftests/bpf/prog_tests/xdp_metadata.c |  3 +++
 tools/testing/selftests/bpf/progs/xdp_metadata.c      | 11 +++++++++++
 2 files changed, 14 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index 61e1b073a4b2..aeb2701efba5 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_EQ(meta->rx_csum_status, XDP_CHECKSUM_MAGIC, "rx_csum_status"))
+		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 2c6c46ef8502..e212b6835518 100644
--- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
@@ -26,6 +26,9 @@ 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,
 					__be16 *vlan_proto,
 					__u16 *vlan_tci) __ksym;
+extern int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
+				    enum xdp_csum_status *csum_status,
+				    __wsum *csum) __ksym;
 
 SEC("xdp")
 int rx(struct xdp_md *ctx)
@@ -63,6 +66,14 @@ int rx(struct xdp_md *ctx)
 	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_proto,
 				     &meta->rx_vlan_tci);
 
+	/* This is supposed to fail on veth, so tell userspace
+	 * everything is OK by passing a magic status.
+	 */
+	ret = bpf_xdp_metadata_rx_csum(ctx, &meta->rx_csum_status,
+				       &meta->rx_csum);
+	if (ret)
+		meta->rx_csum_status = XDP_CHECKSUM_MAGIC;
+
 	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
 }
 
-- 
2.41.0