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Date: Mon, 2 Nov 2020 16:38:36 -0800
From: Martin KaFai Lau <kafai@...com>
To: Alexander Duyck <alexander.duyck@...il.com>
CC: <bpf@...r.kernel.org>, <ast@...nel.org>, <daniel@...earbox.net>,
<john.fastabend@...il.com>, <kernel-team@...com>,
<netdev@...r.kernel.org>, <edumazet@...gle.com>, <brakmo@...com>,
<andrii.nakryiko@...il.com>, <alexanderduyck@...com>
Subject: Re: [bpf-next PATCH v2 2/5] selftests/bpf: Drop python client/server
in favor of threads
On Sat, Oct 31, 2020 at 11:52:18AM -0700, Alexander Duyck wrote:
> From: Alexander Duyck <alexanderduyck@...com>
>
> Drop the tcp_client/server.py files in favor of using a client and server
> thread within the test case. Specifically we spawn a new thread to play the
The thread comment may be outdated in v2.
> role of the server, and the main testing thread plays the role of client.
>
> Add logic to the end of the run_test function to guarantee that the sockets
> are closed when we begin verifying results.
>
> Doing this we are able to reduce overhead since we don't have two python
> workers possibly floating around. In addition we don't have to worry about
> synchronization issues and as such the retry loop waiting for the threads
> to close the sockets can be dropped as we will have already closed the
> sockets in the local executable and synchronized the server thread.
>
> Signed-off-by: Alexander Duyck <alexanderduyck@...com>
> ---
> .../testing/selftests/bpf/prog_tests/tcpbpf_user.c | 96 ++++++++++++++++----
> tools/testing/selftests/bpf/tcp_client.py | 50 ----------
> tools/testing/selftests/bpf/tcp_server.py | 80 -----------------
> 3 files changed, 78 insertions(+), 148 deletions(-)
> delete mode 100755 tools/testing/selftests/bpf/tcp_client.py
> delete mode 100755 tools/testing/selftests/bpf/tcp_server.py
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
> index 54f1dce97729..17d4299435df 100644
> --- a/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
> +++ b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
> @@ -1,13 +1,14 @@
> // SPDX-License-Identifier: GPL-2.0
> #include <inttypes.h>
> #include <test_progs.h>
> +#include <network_helpers.h>
>
> #include "test_tcpbpf.h"
>
> +#define LO_ADDR6 "::1"
> #define CG_NAME "/tcpbpf-user-test"
>
> -/* 3 comes from one listening socket + both ends of the connection */
> -#define EXPECTED_CLOSE_EVENTS 3
> +static __u32 duration;
>
> #define EXPECT_EQ(expected, actual, fmt) \
> do { \
> @@ -42,7 +43,9 @@ int verify_result(const struct tcpbpf_globals *result)
> EXPECT_EQ(0x80, result->bad_cb_test_rv, PRIu32);
> EXPECT_EQ(0, result->good_cb_test_rv, PRIu32);
> EXPECT_EQ(1, result->num_listen, PRIu32);
> - EXPECT_EQ(EXPECTED_CLOSE_EVENTS, result->num_close_events, PRIu32);
> +
> + /* 3 comes from one listening socket + both ends of the connection */
> + EXPECT_EQ(3, result->num_close_events, PRIu32);
>
> return ret;
> }
> @@ -66,6 +69,75 @@ int verify_sockopt_result(int sock_map_fd)
> return ret;
> }
>
> +static int run_test(void)
> +{
> + int listen_fd = -1, cli_fd = -1, accept_fd = -1;
> + char buf[1000];
> + int err = -1;
> + int i;
> +
> + listen_fd = start_server(AF_INET6, SOCK_STREAM, LO_ADDR6, 0, 0);
> + if (CHECK(listen_fd == -1, "start_server", "listen_fd:%d errno:%d\n",
> + listen_fd, errno))
> + goto done;
> +
> + cli_fd = connect_to_fd(listen_fd, 0);
> + if (CHECK(cli_fd == -1, "connect_to_fd(listen_fd)",
> + "cli_fd:%d errno:%d\n", cli_fd, errno))
> + goto done;
> +
> + accept_fd = accept(listen_fd, NULL, NULL);
> + if (CHECK(accept_fd == -1, "accept(listen_fd)",
> + "accept_fd:%d errno:%d\n", accept_fd, errno))
> + goto done;
> +
> + /* Send 1000B of '+'s from cli_fd -> accept_fd */
> + for (i = 0; i < 1000; i++)
> + buf[i] = '+';
> +
> + err = send(cli_fd, buf, 1000, 0);
> + if (CHECK(err != 1000, "send(cli_fd)", "err:%d errno:%d\n", err, errno))
> + goto done;
> +
> + err = recv(accept_fd, buf, 1000, 0);
> + if (CHECK(err != 1000, "recv(accept_fd)", "err:%d errno:%d\n", err, errno))
> + goto done;
> +
> + /* Send 500B of '.'s from accept_fd ->cli_fd */
> + for (i = 0; i < 500; i++)
> + buf[i] = '.';
> +
> + err = send(accept_fd, buf, 500, 0);
> + if (CHECK(err != 500, "send(accept_fd)", "err:%d errno:%d\n", err, errno))
> + goto done;
> +
> + err = recv(cli_fd, buf, 500, 0);
Unlikely, but err from the above send()/recv() could be 0.
> + if (CHECK(err != 500, "recv(cli_fd)", "err:%d errno:%d\n", err, errno))
> + goto done;
> +
> + /*
> + * shutdown accept first to guarantee correct ordering for
> + * bytes_received and bytes_acked when we go to verify the results.
> + */
> + shutdown(accept_fd, SHUT_WR);
> + err = recv(cli_fd, buf, 1, 0);
> + if (CHECK(err, "recv(cli_fd) for fin", "err:%d errno:%d\n", err, errno))
> + goto done;
> +
> + shutdown(cli_fd, SHUT_WR);
> + err = recv(accept_fd, buf, 1, 0);
hmm... I was thinking cli_fd may still be in TCP_LAST_ACK
but we can go with this version first and see if CI could
really hit this case before resurrecting the idea on testing
the TCP_LAST_ACK instead of TCP_CLOSE in test_tcpbpf_kern.c.
> + CHECK(err, "recv(accept_fd) for fin", "err:%d errno:%d\n", err, errno);
> +done:
> + if (accept_fd != -1)
> + close(accept_fd);
> + if (cli_fd != -1)
> + close(cli_fd);
> + if (listen_fd != -1)
> + close(listen_fd);
> +
> + return err;
> +}
> +
> void test_tcpbpf_user(void)
> {
> const char *file = "test_tcpbpf_kern.o";
> @@ -74,7 +146,6 @@ void test_tcpbpf_user(void)
> int error = EXIT_FAILURE;
> struct bpf_object *obj;
> int cg_fd = -1;
> - int retry = 10;
> __u32 key = 0;
> int rv;
>
> @@ -94,11 +165,6 @@ void test_tcpbpf_user(void)
> goto err;
> }
>
> - if (system("./tcp_server.py")) {
> - fprintf(stderr, "FAILED: TCP server\n");
> - goto err;
> - }
> -
> map_fd = bpf_find_map(__func__, obj, "global_map");
> if (map_fd < 0)
> goto err;
> @@ -107,21 +173,15 @@ void test_tcpbpf_user(void)
> if (sock_map_fd < 0)
> goto err;
>
> -retry_lookup:
> + if (run_test())
> + goto err;
> +
> rv = bpf_map_lookup_elem(map_fd, &key, &g);
> if (rv != 0) {
> fprintf(stderr, "FAILED: bpf_map_lookup_elem returns %d\n", rv);
> goto err;
> }
>
> - if (g.num_close_events != EXPECTED_CLOSE_EVENTS && retry--) {
> - fprintf(stderr,
> - "Unexpected number of close events (%d), retrying!\n",
> - g.num_close_events);
> - usleep(100);
> - goto retry_lookup;
> - }
> -
> if (verify_result(&g)) {
> fprintf(stderr, "FAILED: Wrong stats\n");
> goto err;
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