[xdp-hints] Re: [PATCH RESEND bpf-next 13/15] selftests/bpf: Allow VLAN packets in xdp_hw_metadata

[Larysa Zaremba <larysa.zaremba@intel.com>]

On Fri, May 12, 2023 at 11:33:34AM -0700, Stanislav Fomichev wrote:
> On 05/12, 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.
> 
> Can we also extend non-hw test? That should require adding metadata
> handlers to veth to extract relevant parts from skb + update ip link
> commands to add vlan id. Should be relatively easy to do?
> 

Seems like something I can and should do. Will be in v2.

> > 
> > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > ---
> >  tools/testing/selftests/bpf/progs/xdp_hw_metadata.c | 9 ++++++++-
> >  tools/testing/selftests/bpf/xdp_metadata.h          | 8 ++++++++
> >  2 files changed, 16 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..f95f82a8b449 100644
> > --- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> > +++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> > @@ -26,15 +26,22 @@ 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 = (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;
> > -- 
> > 2.35.3
> >