netdev - Re: [PATCH bpf-next v3 14/21] selftests/bpf: Allow VLAN packets in xdp_hw

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Date: Thu, 20 Jul 2023 14:58:58 -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 14/21] selftests/bpf: Allow VLAN packets in xdp_hw_metadata

On 07/19, Larysa Zaremba wrote:
> Make VLAN c-tag and s-tag XDP hint testing more convenient
> by not skipping VLAN-ed packets.
> 
> Allow both 802.1ad and 802.1Q headers.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>

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

> ---
>  tools/testing/selftests/bpf/progs/xdp_hw_metadata.c | 10 +++++++++-
>  tools/testing/selftests/bpf/xdp_metadata.h          |  8 ++++++++
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> index b2dfd7066c6e..63d7de6c6bbb 100644
> --- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> +++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> @@ -26,15 +26,23 @@ int rx(struct xdp_md *ctx)
>  {
>  	void *data, *data_meta, *data_end;
>  	struct ipv6hdr *ip6h = NULL;
> -	struct ethhdr *eth = NULL;
>  	struct udphdr *udp = NULL;
>  	struct iphdr *iph = NULL;
>  	struct xdp_meta *meta;
> +	struct ethhdr *eth;
>  	int err;
>  
>  	data = (void *)(long)ctx->data;
>  	data_end = (void *)(long)ctx->data_end;
>  	eth = data;
> +
> +	if (eth + 1 < data_end && (eth->h_proto == bpf_htons(ETH_P_8021AD) ||
> +				   eth->h_proto == bpf_htons(ETH_P_8021Q)))
> +		eth = (void *)eth + sizeof(struct vlan_hdr);
> +
> +	if (eth + 1 < data_end && eth->h_proto == bpf_htons(ETH_P_8021Q))
> +		eth = (void *)eth + sizeof(struct vlan_hdr);
> +
>  	if (eth + 1 < data_end) {
>  		if (eth->h_proto == bpf_htons(ETH_P_IP)) {
>  			iph = (void *)(eth + 1);
> diff --git a/tools/testing/selftests/bpf/xdp_metadata.h b/tools/testing/selftests/bpf/xdp_metadata.h
> index 938a729bd307..6664893c2c77 100644
> --- a/tools/testing/selftests/bpf/xdp_metadata.h
> +++ b/tools/testing/selftests/bpf/xdp_metadata.h
> @@ -9,6 +9,14 @@
>  #define ETH_P_IPV6 0x86DD
>  #endif
>  
> +#ifndef ETH_P_8021Q
> +#define ETH_P_8021Q 0x8100
> +#endif
> +
> +#ifndef ETH_P_8021AD
> +#define ETH_P_8021AD 0x88A8
> +#endif
> +
>  struct xdp_meta {
>  	__u64 rx_timestamp;
>  	__u64 xdp_timestamp;
> -- 
> 2.41.0
>