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SubjectRe: [RFC PATCH v1 3/3] test/vsock: skbuff merging test
On Sun, Mar 19, 2023 at 09:53:54PM +0300, Arseniy Krasnov wrote:
>This adds test which checks case when data of newly received skbuff is
>appended to the last skbuff in the socket's queue.
>
>This test is actual only for virtio transport.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>---
> tools/testing/vsock/vsock_test.c | 81 ++++++++++++++++++++++++++++++++
> 1 file changed, 81 insertions(+)
>
>diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
>index 3de10dbb50f5..00216c52d8b6 100644
>--- a/tools/testing/vsock/vsock_test.c
>+++ b/tools/testing/vsock/vsock_test.c
>@@ -968,6 +968,82 @@ static void test_seqpacket_inv_buf_server(const struct test_opts *opts)
> test_inv_buf_server(opts, false);
> }
>
>+static void test_stream_virtio_skb_merge_client(const struct test_opts *opts)
>+{
>+ ssize_t res;
>+ int fd;
>+
>+ fd = vsock_stream_connect(opts->peer_cid, 1234);
>+ if (fd < 0) {
>+ perror("connect");
>+ exit(EXIT_FAILURE);
>+ }
>+

Please use a macro for "HELLO" or a variabile, e.g.

char *buf;
...

buf = "HELLO";
res = send(fd, buf, strlen(buf), 0);
...

>+ res = send(fd, "HELLO", strlen("HELLO"), 0);
>+ if (res != strlen("HELLO")) {
>+ fprintf(stderr, "unexpected send(2) result %zi\n", res);
>+ exit(EXIT_FAILURE);
>+ }
>+
>+ control_writeln("SEND0");
>+ /* Peer reads part of first packet. */
>+ control_expectln("REPLY0");
>+
>+ /* Send second skbuff, it will be merged. */
>+ res = send(fd, "WORLD", strlen("WORLD"), 0);

Ditto.

>+ if (res != strlen("WORLD")) {
>+ fprintf(stderr, "unexpected send(2) result %zi\n", res);
>+ exit(EXIT_FAILURE);
>+ }
>+
>+ control_writeln("SEND1");
>+ /* Peer reads merged skbuff packet. */
>+ control_expectln("REPLY1");
>+
>+ close(fd);
>+}
>+
>+static void test_stream_virtio_skb_merge_server(const struct test_opts *opts)
>+{
>+ unsigned char buf[64];
>+ ssize_t res;
>+ int fd;
>+
>+ fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+ if (fd < 0) {
>+ perror("accept");
>+ exit(EXIT_FAILURE);
>+ }
>+
>+ control_expectln("SEND0");
>+
>+ /* Read skbuff partially. */
>+ res = recv(fd, buf, 2, 0);
>+ if (res != 2) {
>+ fprintf(stderr, "expected recv(2) failure, got %zi\n", res);

We don't expect a failure, so please update the error message and make
it easy to figure out which recv() is failing. For example by saying
how many bytes you expected and how many you received.

>+ exit(EXIT_FAILURE);
>+ }
>+
>+ control_writeln("REPLY0");
>+ control_expectln("SEND1");
>+
>+
>+ res = recv(fd, buf, sizeof(buf), 0);

Perhaps a comment here to explain why we expect only 8 bytes.

>+ if (res != 8) {
>+ fprintf(stderr, "expected recv(2) failure, got %zi\n", res);

Ditto.

>+ exit(EXIT_FAILURE);
>+ }
>+
>+ res = recv(fd, buf, sizeof(buf), MSG_DONTWAIT);
>+ if (res != -1) {
>+ fprintf(stderr, "expected recv(2) success, got %zi\n", res);

It's the other way around, isn't it?
Here you expect it to fail instead it is not failing.

>+ exit(EXIT_FAILURE);
>+ }

Moving the pointer correctly, I would also check that there is
HELLOWORLD in the buffer.

Thanks for adding tests in this suite!
Stefano

>+
>+ control_writeln("REPLY1");
>+
>+ close(fd);
>+}
>+
> static struct test_case test_cases[] = {
> {
> .name = "SOCK_STREAM connection reset",
>@@ -1038,6 +1114,11 @@ static struct test_case test_cases[] = {
> .run_client = test_seqpacket_inv_buf_client,
> .run_server = test_seqpacket_inv_buf_server,
> },
>+ {
>+ .name = "SOCK_STREAM virtio skb merge",
>+ .run_client = test_stream_virtio_skb_merge_client,
>+ .run_server = test_stream_virtio_skb_merge_server,
>+ },
> {},
> };
>
>--
>2.25.1
>

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