netdev - Re: [PATCH bpf-next v2 20/20] selftests/bpf: check checksum level in xdp

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Message-ID: <ZKWrXsDmjdR705LG@google.com>
Date: Wed, 5 Jul 2023 10:41:50 -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 v2 20/20] selftests/bpf: check checksum level in xdp_metadata

On 07/03, Larysa Zaremba wrote:
> Verify, whether kfunc in xdp_metadata test correctly returns checksum level
> of zero.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>

Acked-by: Stanislav Fomichev <sdf@...gle.com>

> ---
>  tools/testing/selftests/bpf/prog_tests/xdp_metadata.c | 3 +++
>  tools/testing/selftests/bpf/progs/xdp_metadata.c      | 7 +++++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> index 50ac9f570bc5..6c71d712932e 100644
> --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> @@ -228,6 +228,9 @@ static int verify_xsk_metadata(struct xsk *xsk)
>  	if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
>  		return -1;
>  
> +	if (!ASSERT_NEQ(meta->rx_csum_lvl, 0, "rx_csum_lvl"))
> +		return -1;
> +
>  	xsk_ring_cons__release(&xsk->rx, 1);
>  	refill_rx(xsk, comp_addr);
>  
> diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> index 382984a5d1c9..6f7223d581b7 100644
> --- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
> +++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> @@ -26,6 +26,8 @@ extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
>  extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
>  					__u16 *vlan_tag,
>  					__be16 *vlan_proto) __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)
> @@ -62,6 +64,11 @@ 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_tag, &meta->rx_vlan_proto);
>  
> +	/* Same as with timestamp, zero is expected */
> +	ret = bpf_xdp_metadata_rx_csum_lvl(ctx, &meta->rx_csum_lvl);
> +	if (!ret && meta->rx_csum_lvl == 0)
> +		meta->rx_csum_lvl = 1;
> +
>  	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
>  }
>  
> -- 
> 2.41.0
>