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Fri, 25 Oct 2024 15:41:46 +0000 (GMT) From: Konstantin Shkolnyy To: sgarzare@redhat.com Cc: virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, mjrosato@linux.ibm.com, Konstantin Shkolnyy Subject: [PATCH v3] vsock/test: fix failures due to wrong SO_RCVLOWAT parameter Date: Fri, 25 Oct 2024 10:41:24 -0500 Message-Id: <20241025154124.732008-1-kshk@linux.ibm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: PJJO1tMEtrrwJ16oFZKthF54PSAHqkis X-Proofpoint-GUID: PJJO1tMEtrrwJ16oFZKthF54PSAHqkis X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxscore=0 bulkscore=0 suspectscore=0 spamscore=0 phishscore=0 adultscore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 malwarescore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410250122 Content-Type: text/plain; charset="utf-8" This happens on 64-bit big-endian machines. SO_RCVLOWAT requires an int parameter. However, instead of int, the test uses unsigned long in one place and size_t in another. Both are 8 bytes long on 64-bit machines. The kernel, having received the 8 bytes, doesn't test for the exact size of the parameter, it only cares that it's >=3D sizeof(int), and casts the 4 lower-addressed bytes to an int, which, on a big-endian machine, contains 0. 0 doesn't trigger an error, SO_RCVLOWAT returns with success and the socket stays with the default SO_RCVLOWAT =3D = 1, which results in vsock_test failures, while vsock_perf doesn't even notice that it's failed to change it. Fixes: b1346338fbae ("vsock_test: POLLIN + SO_RCVLOWAT test") Fixes: 542e893fbadc ("vsock/test: two tests to check credit update logic") Fixes: 8abbffd27ced ("test/vsock: vsock_perf utility") Signed-off-by: Konstantin Shkolnyy Reviewed-by: Stefano Garzarella --- Notes: The problem was found on s390 (big endian), while x86-64 didn't show it= . After this fix, all tests pass on s390. Changes for v3: - fix the same problem in vsock_perf and update commit message Changes for v2: - add "Fixes:" lines to the commit message tools/testing/vsock/vsock_perf.c | 6 +++--- tools/testing/vsock/vsock_test.c | 4 ++-- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/tools/testing/vsock/vsock_perf.c b/tools/testing/vsock/vsock_p= erf.c index 4e8578f815e0..22633c2848cc 100644 --- a/tools/testing/vsock/vsock_perf.c +++ b/tools/testing/vsock/vsock_perf.c @@ -133,7 +133,7 @@ static float get_gbps(unsigned long bits, time_t ns_del= ta) ((float)ns_delta / NSEC_PER_SEC); } =20 -static void run_receiver(unsigned long rcvlowat_bytes) +static void run_receiver(int rcvlowat_bytes) { unsigned int read_cnt; time_t rx_begin_ns; @@ -163,7 +163,7 @@ static void run_receiver(unsigned long rcvlowat_bytes) printf("Listen port %u\n", port); printf("RX buffer %lu bytes\n", buf_size_bytes); printf("vsock buffer %lu bytes\n", vsock_buf_bytes); - printf("SO_RCVLOWAT %lu bytes\n", rcvlowat_bytes); + printf("SO_RCVLOWAT %d bytes\n", rcvlowat_bytes); =20 fd =3D socket(AF_VSOCK, SOCK_STREAM, 0); =20 @@ -439,7 +439,7 @@ static long strtolx(const char *arg) int main(int argc, char **argv) { unsigned long to_send_bytes =3D DEFAULT_TO_SEND_BYTES; - unsigned long rcvlowat_bytes =3D DEFAULT_RCVLOWAT_BYTES; + int rcvlowat_bytes =3D DEFAULT_RCVLOWAT_BYTES; int peer_cid =3D -1; bool sender =3D false; =20 diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_t= est.c index f851f8961247..30857dd4ca97 100644 --- a/tools/testing/vsock/vsock_test.c +++ b/tools/testing/vsock/vsock_test.c @@ -833,7 +833,7 @@ static void test_stream_poll_rcvlowat_server(const stru= ct test_opts *opts) =20 static void test_stream_poll_rcvlowat_client(const struct test_opts *opts) { - unsigned long lowat_val =3D RCVLOWAT_BUF_SIZE; + int lowat_val =3D RCVLOWAT_BUF_SIZE; char buf[RCVLOWAT_BUF_SIZE]; struct pollfd fds; short poll_flags; @@ -1282,7 +1282,7 @@ static void test_stream_rcvlowat_def_cred_upd_client(= const struct test_opts *opt static void test_stream_credit_update_test(const struct test_opts *opts, bool low_rx_bytes_test) { - size_t recv_buf_size; + int recv_buf_size; struct pollfd fds; size_t buf_size; void *buf; --=20 2.34.1