[PATCH bpf-next v4 5/6] selftests/bpf: Add bpf_xdp_metadata_rx_checksum support to xdp_hw_metadat prog
From: Vladimir Vdovin <hidden>
Date: 2026-07-08 20:35:15
Also in:
bpf, intel-wired-lan, linux-kselftest
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: Lorenzo Bianconi <lorenzo@kernel.org> Introduce the capability to dump HW rx checksum in xdp_hw_metadata program via bpf_xdp_metadata_rx_checksum() kfunc. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Vladimir Vdovin <redacted> --- .../selftests/bpf/progs/xdp_hw_metadata.c | 7 +++++ tools/testing/selftests/bpf/xdp_hw_metadata.c | 31 +++++++++++++++++++ tools/testing/selftests/bpf/xdp_metadata.h | 12 ++++--- 3 files changed, 46 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
index 330ece2eabdb..5eeadb7e27cf 100644
--- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c@@ -110,6 +110,13 @@ int rx(struct xdp_md *ctx) else meta->hint_valid |= XDP_META_FIELD_VLAN_TAG; + err = bpf_xdp_metadata_rx_checksum(ctx, &meta->ip_summed, + &meta->cksum, &meta->cksum_level); + if (err) + meta->rx_cksum_err = err; + else + meta->hint_valid |= XDP_META_FIELD_CHECKSUM; + __sync_add_and_fetch(&pkts_redir, 1); return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS); }
diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c
index 6db3b5555a22..c63a70a54075 100644
--- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c@@ -8,6 +8,7 @@ * - Metadata verified: * - rx_timestamp * - rx_hash + * - rx_checksum * * TX: * - UDP 9091 packets trigger TX reply
@@ -219,6 +220,30 @@ static void print_vlan_tci(__u16 tag) printf("PCP=%u, DEI=%d, VID=0x%X\n", pcp, dei, vlan_id); } +static void print_rx_cksum(__u8 ip_summed, __u32 cksum, __u8 cksum_level) +{ + const char *cksum_str; + + switch (ip_summed) { + case XDP_CHECKSUM_COMPLETE | XDP_CHECKSUM_UNNECESSARY: + cksum_str = "CHECKSUM_COMPLETE,CHECKSUM_UNNECESSARY"; + break; + case XDP_CHECKSUM_UNNECESSARY: + cksum_str = "CHECKSUM_UNNECESSARY"; + break; + case XDP_CHECKSUM_COMPLETE: + cksum_str = "CHECKSUM_COMPLETE"; + break; + case XDP_CHECKSUM_NONE: + default: + cksum_str = "CHECKSUM_NONE"; + break; + } + + printf("rx-cksum: %s, csum=0x%x, cksum_level=0x%x\n", + cksum_str, cksum, cksum_level); +} + static void verify_xdp_metadata(void *data, clockid_t clock_id) { struct xdp_meta *meta;
@@ -254,6 +279,12 @@ static void verify_xdp_metadata(void *data, clockid_t clock_id) printf("No rx_vlan_tci or rx_vlan_proto, err=%d\n", meta->rx_vlan_tag_err); } + + if (meta->hint_valid & XDP_META_FIELD_CHECKSUM) + print_rx_cksum(meta->ip_summed, meta->cksum, + meta->cksum_level); + else + printf("No rx_cksum, err=%d\n", meta->rx_cksum_err); } static void verify_skb_metadata(int fd)
diff --git a/tools/testing/selftests/bpf/xdp_metadata.h b/tools/testing/selftests/bpf/xdp_metadata.h
index bca09b94af26..f864d4a8bd8c 100644
--- a/tools/testing/selftests/bpf/xdp_metadata.h
+++ b/tools/testing/selftests/bpf/xdp_metadata.h@@ -28,6 +28,7 @@ enum xdp_meta_field { XDP_META_FIELD_TS = BIT(0), XDP_META_FIELD_RSS = BIT(1), XDP_META_FIELD_VLAN_TAG = BIT(2), + XDP_META_FIELD_CHECKSUM = BIT(3), }; #define XDP_CHECKSUM_NONE BIT(0)
@@ -52,10 +53,13 @@ struct xdp_meta { }; __s32 rx_vlan_tag_err; }; - struct { - __u32 ip_summed; - __u32 cksum; - __u8 cksum_level; + union { + struct { + __u32 ip_summed; + __u32 cksum; + __u8 cksum_level; + }; + __s32 rx_cksum_err; }; enum xdp_meta_field hint_valid; };
--
2.47.0