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Date: Mon, 28 Jan 2019 12:37:55 -0800
From: Song Liu <liu.song.a23@...il.com>
To: Stanislav Fomichev <sdf@...gle.com>
Cc: Networking <netdev@...r.kernel.org>,
"David S . Miller" <davem@...emloft.net>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH bpf-next v3 3/3] selftests/bpf: add simple
BPF_PROG_TEST_RUN examples for flow dissector
On Mon, Jan 28, 2019 at 8:55 AM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> Use existing pkt_v4 and pkt_v6 to make sure flow_keys are what we want.
>
> Also, add new bpf_flow_load routine (and flow_dissector_load.h header)
> that loads bpf_flow.o program and does all required setup.
>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
Acked-by: Song Liu <songliubraving@...com>
> ---
> tools/testing/selftests/bpf/Makefile | 3 +
> .../selftests/bpf/flow_dissector_load.c | 43 ++--------
> .../selftests/bpf/flow_dissector_load.h | 55 +++++++++++++
> tools/testing/selftests/bpf/test_progs.c | 78 ++++++++++++++++++-
> 4 files changed, 139 insertions(+), 40 deletions(-)
> create mode 100644 tools/testing/selftests/bpf/flow_dissector_load.h
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 89b0d1799ff3..c566090e5657 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -148,6 +148,9 @@ $(OUTPUT)/test_xdp_noinline.o: CLANG_FLAGS += -fno-inline
> $(OUTPUT)/test_queue_map.o: test_queue_stack_map.h
> $(OUTPUT)/test_stack_map.o: test_queue_stack_map.h
>
> +$(OUTPUT)/flow_dissector_load.o: flow_dissector_load.h
> +$(OUTPUT)/test_progs.o: flow_dissector_load.h
> +
> BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
> BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
> BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
> diff --git a/tools/testing/selftests/bpf/flow_dissector_load.c b/tools/testing/selftests/bpf/flow_dissector_load.c
> index ae8180b11d5f..77cafa66d048 100644
> --- a/tools/testing/selftests/bpf/flow_dissector_load.c
> +++ b/tools/testing/selftests/bpf/flow_dissector_load.c
> @@ -12,6 +12,7 @@
> #include <bpf/libbpf.h>
>
> #include "bpf_rlimit.h"
> +#include "flow_dissector_load.h"
>
> const char *cfg_pin_path = "/sys/fs/bpf/flow_dissector";
> const char *cfg_map_name = "jmp_table";
> @@ -21,46 +22,13 @@ char *cfg_path_name;
>
> static void load_and_attach_program(void)
> {
> - struct bpf_program *prog, *main_prog;
> - struct bpf_map *prog_array;
> - int i, fd, prog_fd, ret;
> + int prog_fd, ret;
> struct bpf_object *obj;
> - int prog_array_fd;
>
> - ret = bpf_prog_load(cfg_path_name, BPF_PROG_TYPE_FLOW_DISSECTOR, &obj,
> - &prog_fd);
> + ret = bpf_flow_load(&obj, cfg_path_name, cfg_section_name,
> + cfg_map_name, &prog_fd);
> if (ret)
> - error(1, 0, "bpf_prog_load %s", cfg_path_name);
> -
> - main_prog = bpf_object__find_program_by_title(obj, cfg_section_name);
> - if (!main_prog)
> - error(1, 0, "bpf_object__find_program_by_title %s",
> - cfg_section_name);
> -
> - prog_fd = bpf_program__fd(main_prog);
> - if (prog_fd < 0)
> - error(1, 0, "bpf_program__fd");
> -
> - prog_array = bpf_object__find_map_by_name(obj, cfg_map_name);
> - if (!prog_array)
> - error(1, 0, "bpf_object__find_map_by_name %s", cfg_map_name);
> -
> - prog_array_fd = bpf_map__fd(prog_array);
> - if (prog_array_fd < 0)
> - error(1, 0, "bpf_map__fd %s", cfg_map_name);
> -
> - i = 0;
> - bpf_object__for_each_program(prog, obj) {
> - fd = bpf_program__fd(prog);
> - if (fd < 0)
> - error(1, 0, "bpf_program__fd");
> -
> - if (fd != prog_fd) {
> - printf("%d: %s\n", i, bpf_program__title(prog, false));
> - bpf_map_update_elem(prog_array_fd, &i, &fd, BPF_ANY);
> - ++i;
> - }
> - }
> + error(1, 0, "bpf_flow_load %s", cfg_path_name);
>
> ret = bpf_prog_attach(prog_fd, 0 /* Ignore */, BPF_FLOW_DISSECTOR, 0);
> if (ret)
> @@ -69,7 +37,6 @@ static void load_and_attach_program(void)
> ret = bpf_object__pin(obj, cfg_pin_path);
> if (ret)
> error(1, 0, "bpf_object__pin %s", cfg_pin_path);
> -
> }
>
> static void detach_program(void)
> diff --git a/tools/testing/selftests/bpf/flow_dissector_load.h b/tools/testing/selftests/bpf/flow_dissector_load.h
> new file mode 100644
> index 000000000000..41dd6959feb0
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/flow_dissector_load.h
> @@ -0,0 +1,55 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
> +#ifndef FLOW_DISSECTOR_LOAD
> +#define FLOW_DISSECTOR_LOAD
> +
> +#include <bpf/bpf.h>
> +#include <bpf/libbpf.h>
> +
> +static inline int bpf_flow_load(struct bpf_object **obj,
> + const char *path,
> + const char *section_name,
> + const char *map_name,
> + int *prog_fd)
> +{
> + struct bpf_program *prog, *main_prog;
> + struct bpf_map *prog_array;
> + int prog_array_fd;
> + int ret, fd, i;
> +
> + ret = bpf_prog_load(path, BPF_PROG_TYPE_FLOW_DISSECTOR, obj,
> + prog_fd);
> + if (ret)
> + return ret;
> +
> + main_prog = bpf_object__find_program_by_title(*obj, section_name);
> + if (!main_prog)
> + return ret;
> +
> + *prog_fd = bpf_program__fd(main_prog);
> + if (*prog_fd < 0)
> + return ret;
> +
> + prog_array = bpf_object__find_map_by_name(*obj, map_name);
> + if (!prog_array)
> + return ret;
> +
> + prog_array_fd = bpf_map__fd(prog_array);
> + if (prog_array_fd < 0)
> + return ret;
> +
> + i = 0;
> + bpf_object__for_each_program(prog, *obj) {
> + fd = bpf_program__fd(prog);
> + if (fd < 0)
> + return fd;
> +
> + if (fd != *prog_fd) {
> + bpf_map_update_elem(prog_array_fd, &i, &fd, BPF_ANY);
> + ++i;
> + }
> + }
> +
> + return 0;
> +}
> +
> +#endif /* FLOW_DISSECTOR_LOAD */
> diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
> index 126fc624290d..5f46680d4ad4 100644
> --- a/tools/testing/selftests/bpf/test_progs.c
> +++ b/tools/testing/selftests/bpf/test_progs.c
> @@ -39,6 +39,7 @@ typedef __u16 __sum16;
> #include "bpf_endian.h"
> #include "bpf_rlimit.h"
> #include "trace_helpers.h"
> +#include "flow_dissector_load.h"
>
> static int error_cnt, pass_cnt;
> static bool jit_enabled;
> @@ -53,9 +54,10 @@ static struct {
> } __packed pkt_v4 = {
> .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
> .iph.ihl = 5,
> - .iph.protocol = 6,
> + .iph.protocol = IPPROTO_TCP,
> .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
> .tcp.urg_ptr = 123,
> + .tcp.doff = 5,
> };
>
> /* ipv6 test vector */
> @@ -65,9 +67,10 @@ static struct {
> struct tcphdr tcp;
> } __packed pkt_v6 = {
> .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
> - .iph.nexthdr = 6,
> + .iph.nexthdr = IPPROTO_TCP,
> .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
> .tcp.urg_ptr = 123,
> + .tcp.doff = 5,
> };
>
> #define _CHECK(condition, tag, duration, format...) ({ \
> @@ -1882,6 +1885,76 @@ static void test_queue_stack_map(int type)
> bpf_object__close(obj);
> }
>
> +#define CHECK_FLOW_KEYS(desc, got, expected) \
> + CHECK(memcmp(&got, &expected, sizeof(got)) != 0, \
> + desc, \
> + "nhoff=%u/%u " \
> + "thoff=%u/%u " \
> + "addr_proto=0x%x/0x%x " \
> + "is_frag=%u/%u " \
> + "is_first_frag=%u/%u " \
> + "is_encap=%u/%u " \
> + "n_proto=0x%x/0x%x " \
> + "sport=%u/%u " \
> + "dport=%u/%u\n", \
> + got.nhoff, expected.nhoff, \
> + got.thoff, expected.thoff, \
> + got.addr_proto, expected.addr_proto, \
> + got.is_frag, expected.is_frag, \
> + got.is_first_frag, expected.is_first_frag, \
> + got.is_encap, expected.is_encap, \
> + 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_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_htons(ETH_P_IPV6),
> +};
> +
> +static 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);
> + if (err) {
> + error_cnt++;
> + 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);
> +
> + bpf_object__close(obj);
> +}
> +
> int main(void)
> {
> srand(time(NULL));
> @@ -1909,6 +1982,7 @@ int main(void)
> test_reference_tracking();
> test_queue_stack_map(QUEUE);
> test_queue_stack_map(STACK);
> + test_flow_dissector();
>
> printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
> return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
> --
> 2.20.1.495.gaa96b0ce6b-goog
>
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