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Date: Sat, 14 May 2022 07:53:36 +0800
From: Geliang Tang <geliangtang@...il.com>
To: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Cc: Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
Geliang Tang <geliang.tang@...e.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
MPTCP Upstream <mptcp@...ts.linux.dev>,
Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: Re: [PATCH bpf-next v4 4/7] selftests/bpf: test bpf_skc_to_mptcp_sock
Mat Martineau <mathew.j.martineau@...ux.intel.com> 于2022年5月14日周六 06:48写道：
>
> From: Geliang Tang <geliang.tang@...e.com>
>
> This patch extends the MPTCP test base, to test the new helper
> bpf_skc_to_mptcp_sock().
>
> Define struct mptcp_sock in bpf_tcp_helpers.h, use bpf_skc_to_mptcp_sock
> to get the msk socket in progs/mptcp_sock.c and store the infos in
> socket_storage_map.
>
> Get the infos from socket_storage_map in prog_tests/mptcp.c. Add a new
> function verify_msk() to verify the infos of MPTCP socket, and rename
> verify_sk() to verify_tsk() to verify TCP socket only.
>
> v2: Add CONFIG_MPTCP check for clearer error messages
> v4:
> - use ASSERT_* instead of CHECK_FAIL (Andrii)
> - drop bpf_mptcp_helpers.h (Andrii)
>
> Acked-by: Matthieu Baerts <matthieu.baerts@...sares.net>
> Signed-off-by: Geliang Tang <geliang.tang@...e.com>
> Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
> ---
> tools/testing/selftests/bpf/bpf_tcp_helpers.h | 5 +++
> .../testing/selftests/bpf/prog_tests/mptcp.c | 45 ++++++++++++++-----
> .../testing/selftests/bpf/progs/mptcp_sock.c | 23 ++++++++--
> 3 files changed, 58 insertions(+), 15 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/bpf_tcp_helpers.h b/tools/testing/selftests/bpf/bpf_tcp_helpers.h
> index 22e0c8849a17..90fecafc493d 100644
> --- a/tools/testing/selftests/bpf/bpf_tcp_helpers.h
> +++ b/tools/testing/selftests/bpf/bpf_tcp_helpers.h
> @@ -226,4 +226,9 @@ static __always_inline bool tcp_cc_eq(const char *a, const char *b)
> extern __u32 tcp_slow_start(struct tcp_sock *tp, __u32 acked) __ksym;
> extern void tcp_cong_avoid_ai(struct tcp_sock *tp, __u32 w, __u32 acked) __ksym;
>
> +struct mptcp_sock {
> + struct inet_connection_sock sk;
> +
> +} __attribute__((preserve_access_index));
> +
> #endif
> diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> index cb0389ca8690..02e7fd8918e6 100644
> --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
> +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
> @@ -11,14 +11,12 @@ struct mptcp_storage {
> __u32 is_mptcp;
> };
>
> -static int verify_sk(int map_fd, int client_fd, const char *msg, __u32 is_mptcp)
> +static int verify_tsk(int map_fd, int client_fd)
> {
> + char *msg = "plain TCP socket";
> int err, cfd = client_fd;
> struct mptcp_storage val;
>
> - if (is_mptcp == 1)
> - return 0;
> -
> err = bpf_map_lookup_elem(map_fd, &cfd, &val);
> if (!ASSERT_OK(err, "bpf_map_lookup_elem"))
> return err;
> @@ -38,6 +36,31 @@ static int verify_sk(int map_fd, int client_fd, const char *msg, __u32 is_mptcp)
> return err;
> }
>
> +static int verify_msk(int map_fd, int client_fd)
> +{
> + char *msg = "MPTCP subflow socket";
> + int err, cfd = client_fd;
> + struct mptcp_storage val;
> +
> + err = bpf_map_lookup_elem(map_fd, &cfd, &val);
> + if (!ASSERT_OK(err, "bpf_map_lookup_elem"))
> + return err;
> +
> + if (val.invoked != 1) {
> + log_err("%s: unexpected invoked count %d != 1",
> + msg, val.invoked);
> + err++;
> + }
> +
> + if (val.is_mptcp != 1) {
> + log_err("%s: unexpected bpf_tcp_sock.is_mptcp %d != 1",
> + msg, val.is_mptcp);
> + err++;
> + }
> +
> + return err;
> +}
> +
> static int run_test(int cgroup_fd, int server_fd, bool is_mptcp)
> {
> int client_fd, prog_fd, map_fd, err;
> @@ -88,8 +111,8 @@ static int run_test(int cgroup_fd, int server_fd, bool is_mptcp)
> goto out;
> }
>
> - err += is_mptcp ? verify_sk(map_fd, client_fd, "MPTCP subflow socket", 1) :
> - verify_sk(map_fd, client_fd, "plain TCP socket", 0);
> + err += is_mptcp ? verify_msk(map_fd, client_fd) :
> + verify_tsk(map_fd, client_fd);
>
> close(client_fd);
>
''''
> @@ -103,25 +126,25 @@ void test_base(void)
> int server_fd, cgroup_fd;
>
> cgroup_fd = test__join_cgroup("/mptcp");
> - if (CHECK_FAIL(cgroup_fd < 0))
> + if (!ASSERT_GE(cgroup_fd, 0, "test__join_cgroup"))
> return;
>
> /* without MPTCP */
> server_fd = start_server(AF_INET, SOCK_STREAM, NULL, 0, 0);
> - if (CHECK_FAIL(server_fd < 0))
> + if (!ASSERT_GE(server_fd, 0, "start_server"))
> goto with_mptcp;
>
> - CHECK_FAIL(run_test(cgroup_fd, server_fd, false));
> + ASSERT_OK(run_test(cgroup_fd, server_fd, false), "run_test tcp");
>
> close(server_fd);
>
> with_mptcp:
> /* with MPTCP */
> server_fd = start_mptcp_server(AF_INET, NULL, 0, 0);
> - if (CHECK_FAIL(server_fd < 0))
> + if (!ASSERT_GE(server_fd, 0, "start_mptcp_server"))
> goto close_cgroup_fd;
>
> - CHECK_FAIL(run_test(cgroup_fd, server_fd, true));
> + ASSERT_OK(run_test(cgroup_fd, server_fd, true), "run_test mptcp");
'''
Sorry Mat, this code using ASSERT_* instead of CHECK_FAIL should be
squash into patch #3, it shouldn't in this patch. I'll send a v5 to
MPTCP ML to fix this.
Thanks,
-Geliang
>
> close(server_fd);
>
> diff --git a/tools/testing/selftests/bpf/progs/mptcp_sock.c b/tools/testing/selftests/bpf/progs/mptcp_sock.c
> index bc09dba0b078..3feb7ff578e2 100644
> --- a/tools/testing/selftests/bpf/progs/mptcp_sock.c
> +++ b/tools/testing/selftests/bpf/progs/mptcp_sock.c
> @@ -7,6 +7,7 @@
> #include "bpf_tcp_helpers.h"
>
> char _license[] SEC("license") = "GPL";
> +extern bool CONFIG_MPTCP __kconfig;
>
> struct mptcp_storage {
> __u32 invoked;
> @@ -24,6 +25,7 @@ SEC("sockops")
> int _sockops(struct bpf_sock_ops *ctx)
> {
> struct mptcp_storage *storage;
> + struct mptcp_sock *msk;
> int op = (int)ctx->op;
> struct tcp_sock *tsk;
> struct bpf_sock *sk;
> @@ -41,11 +43,24 @@ int _sockops(struct bpf_sock_ops *ctx)
> return 1;
>
> is_mptcp = bpf_core_field_exists(tsk->is_mptcp) ? tsk->is_mptcp : 0;
> - storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
> - BPF_SK_STORAGE_GET_F_CREATE);
> - if (!storage)
> - return 1;
> + if (!is_mptcp) {
> + storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
> + BPF_SK_STORAGE_GET_F_CREATE);
> + if (!storage)
> + return 1;
> + } else {
> + if (!CONFIG_MPTCP)
> + return 1;
> +
> + msk = bpf_skc_to_mptcp_sock(sk);
> + if (!msk)
> + return 1;
>
> + storage = bpf_sk_storage_get(&socket_storage_map, msk, 0,
> + BPF_SK_STORAGE_GET_F_CREATE);
> + if (!storage)
> + return 1;
> + }
> storage->invoked++;
> storage->is_mptcp = is_mptcp;
>
> --
> 2.36.1
>
>
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