On Thu, May 21, 2020 at 7:36 AM John Fastabend <john.fastab...@gmail.com> wrote:
>
> The test itself is not particularly useful but it encodes a common
> pattern we have.
>
> Namely do a sk storage lookup then depending on data here decide if
> we need to do more work or alternatively allow packet to PASS. Then
> if we need to do more work consult task_struct for more information
> about the running task. Finally based on this additional information
> drop or pass the data. In this case the suspicious check is not so
> realisitic but it encodes the general pattern and uses the helpers
> so we test the workflow.
>
> This is a load test to ensure verifier correctly handles this case.
>
> Signed-off-by: John Fastabend <john.fastab...@gmail.com>
> ---
> .../selftests/bpf/prog_tests/sockmap_basic.c | 57
> ++++++++++++++++++++
> .../selftests/bpf/progs/test_skmsg_load_helpers.c | 48 +++++++++++++++++
> 2 files changed, 105 insertions(+)
> create mode 100644
> tools/testing/selftests/bpf/progs/test_skmsg_load_helpers.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> index aa43e0b..cacb4ad 100644
> --- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> +++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> @@ -1,13 +1,46 @@
> // SPDX-License-Identifier: GPL-2.0
> // Copyright (c) 2020 Cloudflare
> +#include <error.h>
>
> #include "test_progs.h"
> +#include "test_skmsg_load_helpers.skel.h"
>
> #define TCP_REPAIR 19 /* TCP sock is under repair right now
> */
>
> #define TCP_REPAIR_ON 1
> #define TCP_REPAIR_OFF_NO_WP -1 /* Turn off without window probes */
>
> +#define _FAIL(errnum, fmt...)
> \
> + ({
> \
> + error_at_line(0, (errnum), __func__, __LINE__, fmt);
> \
> + CHECK_FAIL(true);
> \
> + })
> +#define FAIL(fmt...) _FAIL(0, fmt)
> +#define FAIL_ERRNO(fmt...) _FAIL(errno, fmt)
> +#define FAIL_LIBBPF(err, msg)
> \
> + ({
> \
> + char __buf[MAX_STRERR_LEN];
> \
> + libbpf_strerror((err), __buf, sizeof(__buf));
> \
> + FAIL("%s: %s", (msg), __buf);
> \
> + })
> +
> +#define xbpf_prog_attach(prog, target, type, flags)
> \
> + ({
> \
> + int __ret =
> \
> + bpf_prog_attach((prog), (target), (type), (flags));
> \
> + if (__ret == -1)
> \
> + FAIL_ERRNO("prog_attach(" #type ")");
> \
> + __ret;
> \
> + })
> +
> +#define xbpf_prog_detach2(prog, target, type)
> \
> + ({
> \
> + int __ret = bpf_prog_detach2((prog), (target), (type));
> \
> + if (__ret == -1)
> \
> + FAIL_ERRNO("prog_detach2(" #type ")");
> \
> + __ret;
> \
> + })
I'm not convinced we need these macro, can you please just use CHECKs?
I'd rather not learn each specific test's custom macros.
> +
> static int connected_socket_v4(void)
> {
> struct sockaddr_in addr = {
> @@ -70,10 +103,34 @@ static void test_sockmap_create_update_free(enum
> bpf_map_type map_type)
> close(s);
> }
>
> +static void test_skmsg_helpers(enum bpf_map_type map_type)
> +{
> + struct test_skmsg_load_helpers *skel;
> + int err, map, verdict;
> +
> + skel = test_skmsg_load_helpers__open_and_load();
> + if (!skel) {
> + FAIL("skeleton open/load failed");
> + return;
> + }
> +
> + verdict = bpf_program__fd(skel->progs.prog_msg_verdict);
> + map = bpf_map__fd(skel->maps.sock_map);
> +
> + err = xbpf_prog_attach(verdict, map, BPF_SK_MSG_VERDICT, 0);
> + if (err)
> + return;
> + xbpf_prog_detach2(verdict, map, BPF_SK_MSG_VERDICT);
no cleanup in this test, at all
> +}
> +
[...]
> +
> +int _version SEC("version") = 1;
version not needed
> +char _license[] SEC("license") = "GPL";
>
