netdev - Re: [PATCH bpf-next v3 20/21] selftests/bpf: Check VLAN tag and proto in xdp

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Date: Fri, 21 Jul 2023 07:46:56 +0000
From: "Zaremba, Larysa" <larysa.zaremba@...el.com>
To: Stanislav Fomichev <sdf@...gle.com>
CC: "bpf@...r.kernel.org" <bpf@...r.kernel.org>, "ast@...nel.org"
	<ast@...nel.org>, "daniel@...earbox.net" <daniel@...earbox.net>,
	"andrii@...nel.org" <andrii@...nel.org>, "martin.lau@...ux.dev"
	<martin.lau@...ux.dev>, "song@...nel.org" <song@...nel.org>, "yhs@...com"
	<yhs@...com>, "john.fastabend@...il.com" <john.fastabend@...il.com>,
	"kpsingh@...nel.org" <kpsingh@...nel.org>, "haoluo@...gle.com"
	<haoluo@...gle.com>, "jolsa@...nel.org" <jolsa@...nel.org>, David Ahern
	<dsahern@...il.com>, Jakub Kicinski <kuba@...nel.org>, Willem de Bruijn
	<willemb@...gle.com>, "Brouer, Jesper" <brouer@...hat.com>, "Burakov,
 Anatoly" <anatoly.burakov@...el.com>, "Lobakin, Aleksander"
	<aleksander.lobakin@...el.com>, Magnus Karlsson <magnus.karlsson@...il.com>,
	"Tahhan, Maryam" <mtahhan@...hat.com>, "xdp-hints@...-project.net"
	<xdp-hints@...-project.net>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 20/21] selftests/bpf: Check VLAN tag and proto
 in xdp_metadata

On Thu, Jul 20, 2023 at 03:14:15PM -0700, Stanislav Fomichev wrote:
> On 07/19, Larysa Zaremba wrote:
> > Verify, whether VLAN tag and proto are set correctly.
> > 
> > To simulate "stripped" VLAN tag on veth, send test packet from VLAN
> > interface.
> > 
> > Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>
> 
> Acked-by: Stanislav Fomichev <sdf@...gle.com>
> 
> > ---
> >  .../selftests/bpf/prog_tests/xdp_metadata.c   | 22 +++++++++++++++++--
> >  .../selftests/bpf/progs/xdp_metadata.c        |  4 ++++
> >  2 files changed, 24 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > index 1877e5c6d6c7..6665cf0c59cc 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > @@ -38,7 +38,15 @@
> >  #define TX_MAC "00:00:00:00:00:01"
> >  #define RX_MAC "00:00:00:00:00:02"
> >  
> > +#define VLAN_ID 59
> > +#define VLAN_ID_STR "59"
> 
> I was looking whether we have some str(x) macro in the selftests,
> but doesn't look like we have any...
> 

I could add one, if you could hint me at the file, where it would need to go.
Or just add it locally for now?

> > +#define VLAN_PROTO "802.1Q"
> > +#define VLAN_PID htons(ETH_P_8021Q)
> > +#define TX_NAME_VLAN TX_NAME "." VLAN_ID_STR
> > +#define RX_NAME_VLAN RX_NAME "." VLAN_ID_STR
> > +
> >  #define XDP_RSS_TYPE_L4 BIT(3)
> > +#define VLAN_VID_MASK 0xfff
> >  
> >  struct xsk {
> >  	void *umem_area;
> > @@ -215,6 +223,12 @@ static int verify_xsk_metadata(struct xsk *xsk)
> >  	if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
> >  		return -1;
> >  
> > +	if (!ASSERT_EQ(meta->rx_vlan_tci & VLAN_VID_MASK, VLAN_ID, "rx_vlan_tci"))
> > +		return -1;
> > +
> > +	if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
> > +		return -1;
> > +
> >  	xsk_ring_cons__release(&xsk->rx, 1);
> >  	refill_rx(xsk, comp_addr);
> >  
> > @@ -248,10 +262,14 @@ void test_xdp_metadata(void)
> >  
> >  	SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
> >  	SYS(out, "ip link set dev " TX_NAME " up");
> > -	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME);
> > +
> > +	SYS(out, "ip link add link " TX_NAME " " TX_NAME_VLAN
> > +		 " type vlan proto " VLAN_PROTO " id " VLAN_ID_STR);
> > +	SYS(out, "ip link set dev " TX_NAME_VLAN " up");
> > +	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME_VLAN);
> >  
> >  	/* Avoid ARP calls */
> > -	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME);
> > +	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME_VLAN);
> >  	close_netns(tok);
> >  
> >  	tok = open_netns(RX_NETNS_NAME);
> > diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > index d151d406a123..d3111649170e 100644
> > --- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > +++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > @@ -23,6 +23,9 @@ 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;
> >  
> >  SEC("xdp")
> >  int rx(struct xdp_md *ctx)
> > @@ -57,6 +60,7 @@ int rx(struct xdp_md *ctx)
> >  		meta->rx_timestamp = 1;
> >  
> >  	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
> > +	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci, &meta->rx_vlan_proto);
> >  
> >  	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
> >  }
> > -- 
> > 2.41.0
> > 
>