[PATCH bpf-next v2 5/5] selftests/bpf: Add bpf_xdp_metadata_rx_checksum support to xdp_hw_metadat prog
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: 2026-02-13 15:27:13
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
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> --- .../testing/selftests/bpf/progs/xdp_hw_metadata.c | 8 +++++++ tools/testing/selftests/bpf/xdp_hw_metadata.c | 25 ++++++++++++++++++++++ tools/testing/selftests/bpf/xdp_metadata.h | 10 ++++++--- 3 files changed, 40 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
index 330ece2eabdb454da2bb2cbd297d2b2dd6efddc0..9113288fce54bb39dbb6b38e1f6badd0a8ef4cde 100644
--- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c@@ -110,6 +110,14 @@ int rx(struct xdp_md *ctx) else meta->hint_valid |= XDP_META_FIELD_VLAN_TAG; + err = bpf_xdp_metadata_rx_checksum(ctx, + (enum xdp_checksum *)&meta->ip_summed, + &meta->cksum_meta); + 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 3d8de0d4c96a7afdf5f60b2fdff73c22b876ce54..f1cf8490cc497b5dd75b8d839918fb85c2a0684d 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 +220,25 @@ 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_meta) +{ + const char *cksum = "CHECKSUM_NONE"; + + switch (ip_summed) { + case XDP_CHECKSUM_UNNECESSARY: + cksum = "CHECKSUM_UNNECESSARY"; + break; + case XDP_CHECKSUM_COMPLETE: + cksum = "CHECKSUM_COMPLETE"; + break; + case XDP_CHECKSUM_NONE: + default: + break; + } + + printf("rx-cksum: %s, csum_meta=0x%x\n", cksum, cksum_meta); +} + static void verify_xdp_metadata(void *data, clockid_t clock_id) { struct xdp_meta *meta;
@@ -254,6 +274,11 @@ 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); + 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 837cd1efe6b5aebd0f62bae4c49d5bfd77db64bc..822e34390582b3d3660a25e725c9a622edbf635c 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 0
@@ -52,9 +53,12 @@ struct xdp_meta { }; __s32 rx_vlan_tag_err; }; - struct { - __u8 ip_summed; - __u32 cksum_meta; + union { + struct { + __u8 ip_summed; + __u32 cksum_meta; + }; + __s32 rx_cksum_err; }; enum xdp_meta_field hint_valid; };
--
2.53.0