[PATCH v4 1/2] vsock/test: fix failures due to wrong SO_RCVLOWAT parameter

[Konstantin Shkolnyy]

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 >=
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 = 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 <k...@linux.ibm.com>
Reviewed-by: Stefano Garzarella <sgarz...@redhat.com>
---
 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_perf.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_delta)
               ((float)ns_delta / NSEC_PER_SEC);
 }
 
-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);
 
        fd = socket(AF_VSOCK, SOCK_STREAM, 0);
 
@@ -439,7 +439,7 @@ static long strtolx(const char *arg)
 int main(int argc, char **argv)
 {
        unsigned long to_send_bytes = DEFAULT_TO_SEND_BYTES;
-       unsigned long rcvlowat_bytes = DEFAULT_RCVLOWAT_BYTES;
+       int rcvlowat_bytes = DEFAULT_RCVLOWAT_BYTES;
        int peer_cid = -1;
        bool sender = false;
 
diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index 8d38dbf8f41f..7fd25b814b4b 100644
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -835,7 +835,7 @@ static void test_stream_poll_rcvlowat_server(const struct 
test_opts *opts)
 
 static void test_stream_poll_rcvlowat_client(const struct test_opts *opts)
 {
-       unsigned long lowat_val = RCVLOWAT_BUF_SIZE;
+       int lowat_val = RCVLOWAT_BUF_SIZE;
        char buf[RCVLOWAT_BUF_SIZE];
        struct pollfd fds;
        short poll_flags;
@@ -1357,7 +1357,7 @@ 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;
-- 
2.34.1