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Date: Mon, 15 Apr 2019 09:25:34 -0700
From: Song Liu <liu.song.a23@...il.com>
To: Stanislav Fomichev <sdf@...gle.com>
Cc: Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
"David S . Miller" <davem@...emloft.net>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH bpf-next] selftests/bpf: make flow dissector tests more extensible
On Fri, Apr 12, 2019 at 4:43 PM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> Rewrite selftest to iterate over an array with input packet and
> expected flow_keys. This should make it easier to extend this test
> with additional cases without too much boilerplate.
>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
Acked-by: Song Liu <songliubraving@...com>
> ---
> .../selftests/bpf/prog_tests/flow_dissector.c | 197 +++++++++++-------
> 1 file changed, 116 insertions(+), 81 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/flow_dissector.c b/tools/testing/selftests/bpf/prog_tests/flow_dissector.c
> index fc818bc1d729..1a73937826b0 100644
> --- a/tools/testing/selftests/bpf/prog_tests/flow_dissector.c
> +++ b/tools/testing/selftests/bpf/prog_tests/flow_dissector.c
> @@ -2,7 +2,7 @@
> #include <test_progs.h>
>
> #define CHECK_FLOW_KEYS(desc, got, expected) \
> - CHECK(memcmp(&got, &expected, sizeof(got)) != 0, \
> + CHECK_ATTR(memcmp(&got, &expected, sizeof(got)) != 0, \
> desc, \
> "nhoff=%u/%u " \
> "thoff=%u/%u " \
> @@ -10,6 +10,7 @@
> "is_frag=%u/%u " \
> "is_first_frag=%u/%u " \
> "is_encap=%u/%u " \
> + "ip_proto=0x%x/0x%x " \
> "n_proto=0x%x/0x%x " \
> "sport=%u/%u " \
> "dport=%u/%u\n", \
> @@ -19,53 +20,32 @@
> got.is_frag, expected.is_frag, \
> got.is_first_frag, expected.is_first_frag, \
> got.is_encap, expected.is_encap, \
> + got.ip_proto, expected.ip_proto, \
> got.n_proto, expected.n_proto, \
> got.sport, expected.sport, \
> got.dport, expected.dport)
>
> -static struct bpf_flow_keys pkt_v4_flow_keys = {
> - .nhoff = 0,
> - .thoff = sizeof(struct iphdr),
> - .addr_proto = ETH_P_IP,
> - .ip_proto = IPPROTO_TCP,
> - .n_proto = __bpf_constant_htons(ETH_P_IP),
> -};
> -
> -static struct bpf_flow_keys pkt_v6_flow_keys = {
> - .nhoff = 0,
> - .thoff = sizeof(struct ipv6hdr),
> - .addr_proto = ETH_P_IPV6,
> - .ip_proto = IPPROTO_TCP,
> - .n_proto = __bpf_constant_htons(ETH_P_IPV6),
> -};
> -
> -#define VLAN_HLEN 4
> +struct ipv4_pkt {
> + struct ethhdr eth;
> + struct iphdr iph;
> + struct tcphdr tcp;
> +} __packed;
>
> -static struct {
> +struct svlan_ipv4_pkt {
> struct ethhdr eth;
> __u16 vlan_tci;
> __u16 vlan_proto;
> struct iphdr iph;
> struct tcphdr tcp;
> -} __packed pkt_vlan_v4 = {
> - .eth.h_proto = __bpf_constant_htons(ETH_P_8021Q),
> - .vlan_proto = __bpf_constant_htons(ETH_P_IP),
> - .iph.ihl = 5,
> - .iph.protocol = IPPROTO_TCP,
> - .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
> - .tcp.urg_ptr = 123,
> - .tcp.doff = 5,
> -};
> +} __packed;
>
> -static struct bpf_flow_keys pkt_vlan_v4_flow_keys = {
> - .nhoff = VLAN_HLEN,
> - .thoff = VLAN_HLEN + sizeof(struct iphdr),
> - .addr_proto = ETH_P_IP,
> - .ip_proto = IPPROTO_TCP,
> - .n_proto = __bpf_constant_htons(ETH_P_IP),
> -};
> +struct ipv6_pkt {
> + struct ethhdr eth;
> + struct ipv6hdr iph;
> + struct tcphdr tcp;
> +} __packed;
>
> -static struct {
> +struct dvlan_ipv6_pkt {
> struct ethhdr eth;
> __u16 vlan_tci;
> __u16 vlan_proto;
> @@ -73,31 +53,97 @@ static struct {
> __u16 vlan_proto2;
> struct ipv6hdr iph;
> struct tcphdr tcp;
> -} __packed pkt_vlan_v6 = {
> - .eth.h_proto = __bpf_constant_htons(ETH_P_8021AD),
> - .vlan_proto = __bpf_constant_htons(ETH_P_8021Q),
> - .vlan_proto2 = __bpf_constant_htons(ETH_P_IPV6),
> - .iph.nexthdr = IPPROTO_TCP,
> - .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
> - .tcp.urg_ptr = 123,
> - .tcp.doff = 5,
> +} __packed;
> +
> +struct test {
> + const char *name;
> + union {
> + struct ipv4_pkt ipv4;
> + struct svlan_ipv4_pkt svlan_ipv4;
> + struct ipv6_pkt ipv6;
> + struct dvlan_ipv6_pkt dvlan_ipv6;
> + } pkt;
> + struct bpf_flow_keys keys;
> };
>
> -static struct bpf_flow_keys pkt_vlan_v6_flow_keys = {
> - .nhoff = VLAN_HLEN * 2,
> - .thoff = VLAN_HLEN * 2 + sizeof(struct ipv6hdr),
> - .addr_proto = ETH_P_IPV6,
> - .ip_proto = IPPROTO_TCP,
> - .n_proto = __bpf_constant_htons(ETH_P_IPV6),
> +#define VLAN_HLEN 4
> +
> +struct test tests[] = {
> + {
> + .name = "ipv4",
> + .pkt.ipv4 = {
> + .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
> + .iph.ihl = 5,
> + .iph.protocol = IPPROTO_TCP,
> + .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
> + .tcp.doff = 5,
> + },
> + .keys = {
> + .nhoff = 0,
> + .thoff = sizeof(struct iphdr),
> + .addr_proto = ETH_P_IP,
> + .ip_proto = IPPROTO_TCP,
> + .n_proto = __bpf_constant_htons(ETH_P_IP),
> + },
> + },
> + {
> + .name = "ipv6",
> + .pkt.ipv6 = {
> + .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
> + .iph.nexthdr = IPPROTO_TCP,
> + .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
> + .tcp.doff = 5,
> + },
> + .keys = {
> + .nhoff = 0,
> + .thoff = sizeof(struct ipv6hdr),
> + .addr_proto = ETH_P_IPV6,
> + .ip_proto = IPPROTO_TCP,
> + .n_proto = __bpf_constant_htons(ETH_P_IPV6),
> + },
> + },
> + {
> + .name = "802.1q-ipv4",
> + .pkt.svlan_ipv4 = {
> + .eth.h_proto = __bpf_constant_htons(ETH_P_8021Q),
> + .vlan_proto = __bpf_constant_htons(ETH_P_IP),
> + .iph.ihl = 5,
> + .iph.protocol = IPPROTO_TCP,
> + .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
> + .tcp.doff = 5,
> + },
> + .keys = {
> + .nhoff = VLAN_HLEN,
> + .thoff = VLAN_HLEN + sizeof(struct iphdr),
> + .addr_proto = ETH_P_IP,
> + .ip_proto = IPPROTO_TCP,
> + .n_proto = __bpf_constant_htons(ETH_P_IP),
> + },
> + },
> + {
> + .name = "802.1ad-ipv6",
> + .pkt.dvlan_ipv6 = {
> + .eth.h_proto = __bpf_constant_htons(ETH_P_8021AD),
> + .vlan_proto = __bpf_constant_htons(ETH_P_8021Q),
> + .vlan_proto2 = __bpf_constant_htons(ETH_P_IPV6),
> + .iph.nexthdr = IPPROTO_TCP,
> + .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
> + .tcp.doff = 5,
> + },
> + .keys = {
> + .nhoff = VLAN_HLEN * 2,
> + .thoff = VLAN_HLEN * 2 + sizeof(struct ipv6hdr),
> + .addr_proto = ETH_P_IPV6,
> + .ip_proto = IPPROTO_TCP,
> + .n_proto = __bpf_constant_htons(ETH_P_IPV6),
> + },
> + },
> };
>
> void test_flow_dissector(void)
> {
> - struct bpf_flow_keys flow_keys;
> struct bpf_object *obj;
> - __u32 duration, retval;
> int err, prog_fd;
> - __u32 size;
>
> err = bpf_flow_load(&obj, "./bpf_flow.o", "flow_dissector",
> "jmp_table", &prog_fd);
> @@ -106,35 +152,24 @@ void test_flow_dissector(void)
> return;
> }
>
> - err = bpf_prog_test_run(prog_fd, 10, &pkt_v4, sizeof(pkt_v4),
> - &flow_keys, &size, &retval, &duration);
> - CHECK(size != sizeof(flow_keys) || err || retval != 1, "ipv4",
> - "err %d errno %d retval %d duration %d size %u/%lu\n",
> - err, errno, retval, duration, size, sizeof(flow_keys));
> - CHECK_FLOW_KEYS("ipv4_flow_keys", flow_keys, pkt_v4_flow_keys);
> -
> - err = bpf_prog_test_run(prog_fd, 10, &pkt_v6, sizeof(pkt_v6),
> - &flow_keys, &size, &retval, &duration);
> - CHECK(size != sizeof(flow_keys) || err || retval != 1, "ipv6",
> - "err %d errno %d retval %d duration %d size %u/%lu\n",
> - err, errno, retval, duration, size, sizeof(flow_keys));
> - CHECK_FLOW_KEYS("ipv6_flow_keys", flow_keys, pkt_v6_flow_keys);
> + for (int i = 0; i < ARRAY_SIZE(tests); i++) {
> + struct bpf_flow_keys flow_keys;
> + struct bpf_prog_test_run_attr tattr = {
> + .prog_fd = prog_fd,
> + .data_in = &tests[i].pkt,
> + .data_size_in = sizeof(tests[i].pkt),
> + .data_out = &flow_keys,
> + };
>
> - err = bpf_prog_test_run(prog_fd, 10, &pkt_vlan_v4, sizeof(pkt_vlan_v4),
> - &flow_keys, &size, &retval, &duration);
> - CHECK(size != sizeof(flow_keys) || err || retval != 1, "vlan_ipv4",
> - "err %d errno %d retval %d duration %d size %u/%lu\n",
> - err, errno, retval, duration, size, sizeof(flow_keys));
> - CHECK_FLOW_KEYS("vlan_ipv4_flow_keys", flow_keys,
> - pkt_vlan_v4_flow_keys);
> -
> - err = bpf_prog_test_run(prog_fd, 10, &pkt_vlan_v6, sizeof(pkt_vlan_v6),
> - &flow_keys, &size, &retval, &duration);
> - CHECK(size != sizeof(flow_keys) || err || retval != 1, "vlan_ipv6",
> - "err %d errno %d retval %d duration %d size %u/%lu\n",
> - err, errno, retval, duration, size, sizeof(flow_keys));
> - CHECK_FLOW_KEYS("vlan_ipv6_flow_keys", flow_keys,
> - pkt_vlan_v6_flow_keys);
> + err = bpf_prog_test_run_xattr(&tattr);
> + CHECK_ATTR(tattr.data_size_out != sizeof(flow_keys) ||
> + err || tattr.retval != 1,
> + tests[i].name,
> + "err %d errno %d retval %d duration %d size %u/%lu\n",
> + err, errno, tattr.retval, tattr.duration,
> + tattr.data_size_out, sizeof(flow_keys));
> + CHECK_FLOW_KEYS(tests[i].name, flow_keys, tests[i].keys);
> + }
>
> bpf_object__close(obj);
> }
> --
> 2.21.0.392.gf8f6787159e-goog
>
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