[PATCH 2/2] selftests/bpf: validate rx_queue_index in xdp_metadata
From: Siddharth C <hidden>
Date: 2026-06-20 12:14:09
Also in:
bpf, linux-kselftest, lkml
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [selftests] (test runners & infrastructure), kernel selftest framework, the rest, xdp (express data path) · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Shuah Khan, Linus Torvalds, David S. Miller, Jakub Kicinski, Jesper Dangaard Brouer, John Fastabend
From: Siddharth_Cibi <redacted> Extend xdp_metadata selftest coverage to validate that ctx->rx_queue_index is preserved and observable after XDP redirect execution. Capture rx_queue_index in metadata and assert that it matches the expected queue during packet verification. Signed-off-by: Siddharth_Cibi <redacted> --- tools/testing/selftests/bpf/prog_tests/xdp_metadata.c | 3 ++- tools/testing/selftests/bpf/progs/xdp_metadata.c | 2 +- tools/testing/selftests/bpf/xdp_metadata.h | 1 + 3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index 5c31054ad4a4..f8cabbbe7bb7 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c@@ -309,7 +309,8 @@ 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->rx_queue_index, QUEUE_ID, "rx_queue_index")) + 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 09bb8a038d52..62ae83860d7f 100644
--- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c@@ -98,7 +98,7 @@ 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_proto, &meta->rx_vlan_tci); - + meta->rx_queue_index = ctx->rx_queue_index; 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 87318ad1117a..1f0ae4c00091 100644
--- a/tools/testing/selftests/bpf/xdp_metadata.h
+++ b/tools/testing/selftests/bpf/xdp_metadata.h@@ -49,4 +49,5 @@ struct xdp_meta { __s32 rx_vlan_tag_err; }; enum xdp_meta_field hint_valid; + __u32 rx_queue_index; };
--
2.53.0