[PATCH RESEND bpf-next 15/15] selftests/bpf: Add flags and new hints to xdp_hw_metadata

Larysa Zaremba
2023-05-12T15:29:34Z

Add hints added in the previous patches (VLAN tags and checksum level)
to the xdp_hw_metadata program.

Also, to make metadata layout more straightforward, add flags field
to pass information about validity of every separate hint separately.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
.../selftests/bpf/progs/xdp_hw_metadata.c | 40 ++++++++++++++++---
tools/testing/selftests/bpf/xdp_hw_metadata.c | 29 +++++++++++---
tools/testing/selftests/bpf/xdp_metadata.h | 28 ++++++++++++-
3 files changed, 85 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
index f95f82a8b449..97bad79ce4ca 100644
--- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
@@ -20,6 +20,12 @@ extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
__u64 *timestamp) __ksym;
extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
enum xdp_rss_hash_type *rss_type) __ksym;
+extern int bpf_xdp_metadata_rx_ctag(const struct xdp_md *ctx,
+ __u16 *vlan_tag) __ksym;
+extern int bpf_xdp_metadata_rx_stag(const struct xdp_md *ctx,
+ __u16 *vlan_tag) __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)
@@ -83,15 +89,39 @@ int rx(struct xdp_md *ctx)
return XDP_PASS;
}

+ meta->hint_valid = 0;
+
err = bpf_xdp_metadata_rx_timestamp(ctx, &meta->rx_timestamp);
- if (!err)
+ if (err) {
+ meta->rx_timestamp_err = err;
+ } else {
+ meta->hint_valid |= XDP_META_FIELD_TS;
meta->xdp_timestamp = bpf_ktime_get_tai_ns();
- else
- meta->rx_timestamp = 0; /* Used by AF_XDP as not avail signal */
+ }

err = bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
- if (err < 0)
- meta->rx_hash_err = err; /* Used by AF_XDP as no hash signal */
+ if (err)
+ meta->rx_hash_err = err;
+ else
+ meta->hint_valid |= XDP_META_FIELD_RSS;
+
+ err = bpf_xdp_metadata_rx_ctag(ctx, &meta->rx_ctag);
+ if (err)
+ meta->rx_ctag_err = err;
+ else
+ meta->hint_valid |= XDP_META_FIELD_CTAG;
+
+ err = bpf_xdp_metadata_rx_stag(ctx, &meta->rx_stag);
+ if (err)
+ meta->rx_stag_err = err;
+ else
+ meta->hint_valid |= XDP_META_FIELD_STAG;
+
+ err = bpf_xdp_metadata_rx_csum_lvl(ctx, &meta->rx_csum_lvl);
+ if (err)
+ meta->rx_csum_err = err;
+ else
+ meta->hint_valid |= XDP_META_FIELD_CSUM_LVL;

__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 613321eb84c1..efcabe68f64b 100644
--- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
@@ -156,15 +156,16 @@ static void verify_xdp_metadata(void *data, clockid_t clock_id)

meta = data - sizeof(*meta);

- if (meta->rx_hash_err < 0)
- printf("No rx_hash err=%d\n", meta->rx_hash_err);
- else
+ if (meta->hint_valid & XDP_META_FIELD_RSS)
printf("rx_hash: 0x%X with RSS type:0x%X\n",
meta->rx_hash, meta->rx_hash_type);
+ else
+ printf("No rx_hash, err=%d\n", meta->rx_hash_err);
+
+ if (meta->hint_valid & XDP_META_FIELD_TS) {
+ printf("rx_timestamp: %llu (sec:%0.4f)\n", meta->rx_timestamp,
+ (double)meta->rx_timestamp / NANOSEC_PER_SEC);

- printf("rx_timestamp: %llu (sec:%0.4f)\n", meta->rx_timestamp,
- (double)meta->rx_timestamp / NANOSEC_PER_SEC);
- if (meta->rx_timestamp) {
__u64 usr_clock = gettime(clock_id);
__u64 xdp_clock = meta->xdp_timestamp;
__s64 delta_X = xdp_clock - meta->rx_timestamp;
@@ -179,8 +180,24 @@ static void verify_xdp_metadata(void *data, clockid_t clock_id)
usr_clock, (double)usr_clock / NANOSEC_PER_SEC,
(double)delta_X2U / NANOSEC_PER_SEC,
(double)delta_X2U / 1000);
+ } else {
+ printf("No rx_timestamp, err=%d\n", meta->rx_timestamp_err);
}

+ if (meta->hint_valid & XDP_META_FIELD_CTAG)
+ printf("rx_ctag: %u\n", meta->rx_ctag);
+ else
+ printf("No rx_ctag, err=%d\n", meta->rx_ctag_err);
+
+ if (meta->hint_valid & XDP_META_FIELD_STAG)
+ printf("rx_stag: %u\n", meta->rx_stag);
+ else
+ printf("No rx_stag, err=%d\n", meta->rx_stag_err);
+
+ if (meta->hint_valid & XDP_META_FIELD_CSUM_LVL)
+ printf("Checksum was checked at level %u\n", meta->rx_csum_lvl);
+ else
+ printf("Checksum was not checked, err=%d\n", meta->rx_csum_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 6664893c2c77..7c0267a8918a 100644
--- a/tools/testing/selftests/bpf/xdp_metadata.h
+++ b/tools/testing/selftests/bpf/xdp_metadata.h
@@ -17,12 +17,38 @@
#define ETH_P_8021AD 0x88A8
#endif

+#define BIT(nr) (1 << (nr))
+
+enum xdp_meta_field {
+ XDP_META_FIELD_TS = BIT(0),
+ XDP_META_FIELD_RSS = BIT(1),
+ XDP_META_FIELD_CTAG = BIT(2),
+ XDP_META_FIELD_STAG = BIT(3),
+ XDP_META_FIELD_CSUM_LVL = BIT(4),
+};
+
struct xdp_meta {
- __u64 rx_timestamp;
+ union {
+ __u64 rx_timestamp;
+ __s32 rx_timestamp_err;
+ };
__u64 xdp_timestamp;
__u32 rx_hash;
union {
__u32 rx_hash_type;
__s32 rx_hash_err;
};
+ union {
+ __u16 rx_ctag;
+ __s32 rx_ctag_err;
+ };
+ union {
+ __u16 rx_stag;
+ __s32 rx_stag_err;
+ };
+ union {
+ __u8 rx_csum_lvl;
+ __s32 rx_csum_err;
+ };
+ enum xdp_meta_field hint_valid;
};
--
2.35.3