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selftests/bpf: Check VLAN tag and proto in xdp_metadata

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Verify, whether VLAN tag and proto are set correctly.

To simulate "stripped" VLAN tag on veth, send test packet from VLAN
interface.

Also, add TO_STR() macro for convenience.

Acked-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
Link: https://lore.kernel.org/r/20231205210847.28460-19-larysa.zaremba@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Larysa Zaremba 2023-12-05 22:08:47 +01:00 committed by Alexei Starovoitov
parent a3850af4ea
commit 4c6612f610
3 changed files with 26 additions and 2 deletions
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20
tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
View File

@ -38,7 +38,13 @@
#define TX_MAC "00:00:00:00:00:01"
#define RX_MAC "00:00:00:00:00:02"
#define VLAN_ID 59
#define VLAN_PROTO "802.1Q"
#define VLAN_PID htons(ETH_P_8021Q)
#define TX_NAME_VLAN TX_NAME "." TO_STR(VLAN_ID)
#define XDP_RSS_TYPE_L4 BIT(3)
#define VLAN_VID_MASK 0xfff
struct xsk {
void *umem_area;
@ -323,6 +329,12 @@ static int verify_xsk_metadata(struct xsk *xsk, bool sent_from_af_xdp)
if (!sent_from_af_xdp) {
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;
goto done;
}
@ -378,10 +390,14 @@ 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 " TO_STR(VLAN_ID));
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);
switch_ns_to_rx(&tok);

5
tools/testing/selftests/bpf/progs/xdp_metadata.c
View File

@ -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,
__be16 *vlan_proto,
__u16 *vlan_tci) __ksym;
SEC("xdp")
int rx(struct xdp_md *ctx)
@ -86,6 +89,8 @@ 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_proto,
&meta->rx_vlan_tci);
return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
}

3
tools/testing/selftests/bpf/testing_helpers.h
View File

@ -9,6 +9,9 @@
#include <bpf/libbpf.h>
#include <time.h>
#define __TO_STR(x) #x
#define TO_STR(x) __TO_STR(x)
int parse_num_list(const char *s, bool **set, int *set_len);
__u32 link_info_prog_id(const struct bpf_link *link, struct bpf_link_info *info);
int bpf_prog_test_load(const char *file, enum bpf_prog_type type,