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Message-ID: <ZOiiPnQPSwZJZD8w@boxer>
Date: Fri, 25 Aug 2023 14:44:46 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Magnus Karlsson <magnus.karlsson@...il.com>
CC: <magnus.karlsson@...el.com>, <bjorn@...nel.org>, <ast@...nel.org>,
<daniel@...earbox.net>, <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
<yhs@...com>, <andrii@...nel.org>, <martin.lau@...ux.dev>, <song@...nel.org>,
<john.fastabend@...il.com>, <kpsingh@...nel.org>, <sdf@...gle.com>,
<haoluo@...gle.com>, <jolsa@...nel.org>, <przemyslaw.kitszel@...el.com>
Subject: Re: [PATCH bpf-next v2 07/11] selftests/xsk: add option to run
single test
On Thu, Aug 24, 2023 at 02:28:49PM +0200, Magnus Karlsson wrote:
> From: Magnus Karlsson <magnus.karlsson@...el.com>
>
> Add a command line option to be able to run a single test. This option
> (-t) takes a number from the list of tests available with the "-l"
> option. Here are two examples:
>
> Run test number 2, the "receive single packet" test in all available modes:
>
> ./test_xsk.sh -t 2
>
> Run test number 21, the metadata copy test in skb mode only
>
> ./test_xsh.sh -t 21 -m skb
>
> Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
> ---
> tools/testing/selftests/bpf/test_xsk.sh | 10 +++-
> tools/testing/selftests/bpf/xskxceiver.c | 58 ++++++++++++++++--------
> tools/testing/selftests/bpf/xskxceiver.h | 3 ++
> 3 files changed, 52 insertions(+), 19 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/test_xsk.sh b/tools/testing/selftests/bpf/test_xsk.sh
> index 489101922984..b7186ae48497 100755
> --- a/tools/testing/selftests/bpf/test_xsk.sh
> +++ b/tools/testing/selftests/bpf/test_xsk.sh
> @@ -79,12 +79,15 @@
> #
> # List available tests
> # ./test_xsk.sh -l
> +#
> +# Run a specific test from the test suite
> +# sudo ./test_xsk.sh -t TEST_NAME
>
> . xsk_prereqs.sh
>
> ETH=""
>
> -while getopts "vi:dm:l" flag
> +while getopts "vi:dm:lt:" flag
> do
> case "${flag}" in
> v) verbose=1;;
> @@ -92,6 +95,7 @@ do
> i) ETH=${OPTARG};;
> m) XSKTEST_MODE=${OPTARG};;
> l) list=1;;
> + t) XSKTEST_TEST=${OPTARG};;
> esac
> done
>
> @@ -170,6 +174,10 @@ if [ -n "$XSKTEST_MODE" ]; then
> ARGS+="-m ${XSKTEST_MODE} "
> fi
>
> +if [ -n "$XSKTEST_TEST" ]; then
> + ARGS+="-t ${XSKTEST_TEST} "
> +fi
> +
> retval=$?
> test_status $retval "${TEST_NAME}"
>
> diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
> index a063b9af7fff..6eca5f95a3e0 100644
> --- a/tools/testing/selftests/bpf/xskxceiver.c
> +++ b/tools/testing/selftests/bpf/xskxceiver.c
> @@ -110,6 +110,7 @@ static const char *MAC2 = "\x00\x0A\x56\x9E\xEE\x61";
> static bool opt_verbose;
> static bool opt_print_tests;
> static enum test_mode opt_mode = TEST_MODE_ALL;
> +static u32 opt_run_test = RUN_ALL_TESTS;
>
> static void __exit_with_error(int error, const char *file, const char *func, int line)
> {
> @@ -316,10 +317,11 @@ static struct option long_options[] = {
> {"verbose", no_argument, 0, 'v'},
> {"mode", required_argument, 0, 'm'},
> {"list", no_argument, 0, 'l'},
> + {"test", required_argument, 0, 't'},
> {0, 0, 0, 0}
> };
>
> -static void usage(const char *prog)
> +static void print_usage(char **argv)
> {
> const char *str =
> " Usage: xskxceiver [OPTIONS]\n"
> @@ -328,9 +330,11 @@ static void usage(const char *prog)
> " -v, --verbose Verbose output\n"
> " -b, --busy-poll Enable busy poll\n"
> " -m, --mode Run only mode skb, drv, or zc\n"
> - " -l, --list List all available tests\n";
> + " -l, --list List all available tests\n"
> + " -t, --test Run a specific test. Enter number from -l option.\n";
>
> - ksft_print_msg(str, prog);
> + ksft_print_msg(str, basename(argv[0]));
> + ksft_exit_xfail();
> }
>
> static bool validate_interface(struct ifobject *ifobj)
> @@ -350,7 +354,7 @@ static void parse_command_line(struct ifobject *ifobj_tx, struct ifobject *ifobj
> opterr = 0;
>
> for (;;) {
> - c = getopt_long(argc, argv, "i:vbm:l", long_options, &option_index);
> + c = getopt_long(argc, argv, "i:vbm:lt:", long_options, &option_index);
> if (c == -1)
> break;
>
> @@ -390,16 +394,20 @@ static void parse_command_line(struct ifobject *ifobj_tx, struct ifobject *ifobj
> strlen("zc")))) {
> opt_mode = TEST_MODE_ZC;
> } else {
> - usage(basename(argv[0]));
> - ksft_exit_xfail();
> + print_usage(argv);
> }
> break;
> case 'l':
> opt_print_tests = true;
> break;
> + case 't':
> + errno = 0;
> + opt_run_test = strtol(optarg, NULL, 0);
> + if (errno)
> + print_usage(argv);
aren't you missing ksft_exit_xfail(); here?
> + break;
> default:
> - usage(basename(argv[0]));
> - ksft_exit_xfail();
> + print_usage(argv);
> }
> }
> }
> @@ -2330,8 +2338,8 @@ int main(int argc, char **argv)
> struct pkt_stream *rx_pkt_stream_default;
> struct pkt_stream *tx_pkt_stream_default;
> struct ifobject *ifobj_tx, *ifobj_rx;
> + u32 i, j, failed_tests = 0, nb_tests;
> int modes = TEST_MODE_SKB + 1;
> - u32 i, j, failed_tests = 0;
> struct test_spec test;
> bool shared_netdev;
>
> @@ -2353,15 +2361,17 @@ int main(int argc, char **argv)
> print_tests();
> ksft_exit_xpass();
> }
> + if (opt_run_test != RUN_ALL_TESTS && opt_run_test >= ARRAY_SIZE(tests)) {
> + ksft_print_msg("Error: test %u does not exist.\n", opt_run_test);
> + ksft_exit_xfail();
> + }
>
> shared_netdev = (ifobj_tx->ifindex == ifobj_rx->ifindex);
> ifobj_tx->shared_umem = shared_netdev;
> ifobj_rx->shared_umem = shared_netdev;
>
> - if (!validate_interface(ifobj_tx) || !validate_interface(ifobj_rx)) {
> - usage(basename(argv[0]));
> - ksft_exit_xfail();
> - }
> + if (!validate_interface(ifobj_tx) || !validate_interface(ifobj_rx))
> + print_usage(argv);
>
> if (is_xdp_supported(ifobj_tx->ifindex)) {
> modes++;
> @@ -2380,19 +2390,31 @@ int main(int argc, char **argv)
> test.tx_pkt_stream_default = tx_pkt_stream_default;
> test.rx_pkt_stream_default = rx_pkt_stream_default;
>
> + if (opt_run_test == RUN_ALL_TESTS)
> + nb_tests = ARRAY_SIZE(tests);
> + else
> + nb_tests = 1;
> if (opt_mode == TEST_MODE_ALL)
> - ksft_set_plan(modes * ARRAY_SIZE(tests));
> + ksft_set_plan(modes * nb_tests);
> else
> - ksft_set_plan(ARRAY_SIZE(tests));
> + ksft_set_plan(nb_tests);
>
> for (i = 0; i < modes; i++) {
> if (opt_mode != TEST_MODE_ALL && i != opt_mode)
> continue;
>
> - for (j = 0; j < ARRAY_SIZE(tests); j++) {
> - test_spec_init(&test, ifobj_tx, ifobj_rx, i, &tests[j]);
> + if (opt_run_test == RUN_ALL_TESTS) {
> + for (j = 0; j < ARRAY_SIZE(tests); j++) {
> + test_spec_init(&test, ifobj_tx, ifobj_rx, i, &tests[j]);
> + run_pkt_test(&test);
> + usleep(USLEEP_MAX);
> +
> + if (test.fail)
> + failed_tests++;
> + }
> + } else {
> + test_spec_init(&test, ifobj_tx, ifobj_rx, i, &tests[opt_run_test]);
> run_pkt_test(&test);
> - usleep(USLEEP_MAX);
Could we simplify this and avoid branching just for getting the index of
test to run with something like:
for (curr_test = opt_run_test; j = 0; j < nb_tests; j++, curr_test++) {
branch vs additional variable, up to you but repeated code caught my eye
>
> if (test.fail)
> failed_tests++;
> diff --git a/tools/testing/selftests/bpf/xskxceiver.h b/tools/testing/selftests/bpf/xskxceiver.h
> index 3a71d490db3e..8015aeea839d 100644
> --- a/tools/testing/selftests/bpf/xskxceiver.h
> +++ b/tools/testing/selftests/bpf/xskxceiver.h
> @@ -5,6 +5,8 @@
> #ifndef XSKXCEIVER_H_
> #define XSKXCEIVER_H_
>
> +#include <limits.h>
> +
> #include "xsk_xdp_progs.skel.h"
>
> #ifndef SOL_XDP
> @@ -56,6 +58,7 @@
> #define XSK_DESC__MAX_SKB_FRAGS 18
> #define HUGEPAGE_SIZE (2 * 1024 * 1024)
> #define PKT_DUMP_NB_TO_PRINT 16
> +#define RUN_ALL_TESTS UINT_MAX
>
> #define print_verbose(x...) do { if (opt_verbose) ksft_print_msg(x); } while (0)
>
> --
> 2.34.1
>
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