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Date: Thu, 20 Jul 2023 15:00:48 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: Larysa Zaremba <larysa.zaremba@...el.com>
Cc: bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org, yhs@...com,
john.fastabend@...il.com, kpsingh@...nel.org, haoluo@...gle.com,
jolsa@...nel.org, David Ahern <dsahern@...il.com>, Jakub Kicinski <kuba@...nel.org>,
Willem de Bruijn <willemb@...gle.com>, Jesper Dangaard Brouer <brouer@...hat.com>,
Anatoly Burakov <anatoly.burakov@...el.com>, Alexander Lobakin <alexandr.lobakin@...el.com>,
Magnus Karlsson <magnus.karlsson@...il.com>, Maryam Tahhan <mtahhan@...hat.com>,
xdp-hints@...-project.net, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 16/21] selftests/bpf: Add flags and new hints
to xdp_hw_metadata
On 07/19, Larysa Zaremba wrote:
> Add hints added in the previous patches (VLAN tag and checksum)
> 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@...el.com>
Acked-by: Stanislav Fomichev <sdf@...gle.com>
with a small nit below
> ---
> .../selftests/bpf/progs/xdp_hw_metadata.c | 37 +++++++--
> tools/testing/selftests/bpf/xdp_hw_metadata.c | 79 +++++++++++++++++--
> tools/testing/selftests/bpf/xdp_metadata.h | 31 +++++++-
> 3 files changed, 135 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 63d7de6c6bbb..75a61317668d 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_vlan_tag(const struct xdp_md *ctx,
> + __u16 *vlan_tci,
> + __be16 *vlan_proto) __ksym;
> +extern int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
> + enum xdp_csum_status *csum_status,
> + union xdp_csum_info *csum_info) __ksym;
>
> SEC("xdp")
> int rx(struct xdp_md *ctx)
> @@ -84,15 +90,36 @@ 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();
> + }
Maybe we can call bpf_ktime_get_tai_ns unconditionally? Then it will
match the rest formatting-wise (no {}).
meta->xdp_timestamp = bpf_ktime_get_tai_ns();
err = bpf_xdp_metadata_rx_timestamp(ctx, &meta->rx_timestamp);
if (err)
meta->rx_timestamp_err = err;
else
meta->hint_valid |= XDP_META_FIELD_TS;
WDYT?
> +
> + err = bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash,
> + &meta->rx_hash_type);
> + if (err)
> + meta->rx_hash_err = err;
> else
> - meta->rx_timestamp = 0; /* Used by AF_XDP as not avail signal */
> + meta->hint_valid |= XDP_META_FIELD_RSS;
>
> - 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 */
> + err = bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci,
> + &meta->rx_vlan_proto);
> + if (err)
> + meta->rx_vlan_tag_err = err;
> + else
> + meta->hint_valid |= XDP_META_FIELD_VLAN_TAG;
> +
> + err = bpf_xdp_metadata_rx_csum(ctx, &meta->rx_csum_status,
> + (void *)&meta->rx_csum_info);
> + if (err)
> + meta->rx_csum_err = err;
> + else
> + meta->hint_valid |= XDP_META_FIELD_CSUM;
>
> __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..a045de7dc910 100644
> --- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
> +++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
> @@ -19,6 +19,9 @@
> #include "xsk.h"
>
> #include <error.h>
> +#include <linux/kernel.h>
> +#include <linux/bits.h>
> +#include <linux/bitfield.h>
> #include <linux/errqueue.h>
> #include <linux/if_link.h>
> #include <linux/net_tstamp.h>
> @@ -150,21 +153,70 @@ static __u64 gettime(clockid_t clock_id)
> return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
> }
>
> +#define VLAN_PRIO_MASK GENMASK(15, 13) /* Priority Code Point */
> +#define VLAN_DEI_MASK GENMASK(12, 12) /* Drop Eligible Indicator */
> +#define VLAN_VID_MASK GENMASK(11, 0) /* VLAN Identifier */
> +static void print_vlan_tci(__u16 tag)
> +{
> + __u16 vlan_id = FIELD_GET(VLAN_VID_MASK, tag);
> + __u8 pcp = FIELD_GET(VLAN_PRIO_MASK, tag);
> + bool dei = FIELD_GET(VLAN_DEI_MASK, tag);
> +
> + printf("PCP=%u, DEI=%d, VID=0x%X\n", pcp, dei, vlan_id);
> +}
> +
> +#define XDP_CHECKSUM_VALID_NUM_MASK GENMASK(2, 0)
> +#define XDP_CHECKSUM_PARTIAL BIT(3)
> +#define XDP_CHECKSUM_COMPLETE BIT(4)
> +
> +struct partial_csum_info {
> + __u16 csum_start;
> + __u16 csum_offset;
> +};
> +
> +static void print_csum_state(__u32 status, __u32 info)
> +{
> + u8 csum_num = status & XDP_CHECKSUM_VALID_NUM_MASK;
> +
> + printf("Checksum status: ");
> + if (status != XDP_CHECKSUM_PARTIAL &&
> + status & ~(XDP_CHECKSUM_COMPLETE | XDP_CHECKSUM_VALID_NUM_MASK))
> + printf("cannot be interpreted, status=0x%X\n", status);
> +
> + if (status == XDP_CHECKSUM_PARTIAL) {
> + struct partial_csum_info *partial_info = (void *)&info;
> +
> + printf("partial, csum_start=%u, csum_offset=%u\n",
> + partial_info->csum_start, partial_info->csum_offset);
> + return;
> + }
> +
> + if (status & XDP_CHECKSUM_COMPLETE)
> + printf("complete, checksum=0x%X%s", info,
> + csum_num ? ", " : "\n");
> +
> + if (csum_num > 1)
> + printf("%u consecutive checksums are verified\n", csum_num);
> + else if (csum_num)
> + printf("outermost checksum is verified\n");
> +}
> +
> static void verify_xdp_metadata(void *data, clockid_t clock_id)
> {
> struct xdp_meta *meta;
>
> 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 +231,23 @@ 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_VLAN_TAG) {
> + printf("rx_vlan_proto: 0x%X\n", ntohs(meta->rx_vlan_proto));
> + printf("rx_vlan_tci: ");
> + print_vlan_tci(meta->rx_vlan_tci);
> + } else {
> + printf("No rx_vlan_tci or rx_vlan_proto, err=%d\n",
> + meta->rx_vlan_tag_err);
> + }
> +
> + if (meta->hint_valid & XDP_META_FIELD_CSUM)
> + print_csum_state(meta->rx_csum_status, meta->rx_csum_info);
> + 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..95e7b53d6bfb 100644
> --- a/tools/testing/selftests/bpf/xdp_metadata.h
> +++ b/tools/testing/selftests/bpf/xdp_metadata.h
> @@ -17,12 +17,41 @@
> #define ETH_P_8021AD 0x88A8
> #endif
>
> +#ifndef BIT
> +#define BIT(nr) (1 << (nr))
> +#endif
> +
> +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_CSUM = BIT(3),
> +};
> +
> 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 {
> + struct {
> + __u16 rx_vlan_tci;
> + __be16 rx_vlan_proto;
> + };
> + __s32 rx_vlan_tag_err;
> + };
> + union {
> + struct {
> + __u32 rx_csum_status;
> + __u32 rx_csum_info;
> + };
> + __s32 rx_csum_err;
> + };
> + enum xdp_meta_field hint_valid;
> };
> --
> 2.41.0
>
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