linux-kernel - Re: [PATCH net-next 5/5] vsock/test: track bytes in MSG_PEEK test for SOCK

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Message-ID: <97ea5def-d82f-9f8b-fb45-8b37c3d96cb9@salutedevices.com>
Date:   Fri, 15 Sep 2023 22:29:06 +0300
From:   Arseniy Krasnov <avkrasnov@...utedevices.com>
To:     Stefano Garzarella <sgarzare@...hat.com>, <netdev@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>, <oxffffaa@...il.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>
Subject: Re: [PATCH net-next 5/5] vsock/test: track bytes in MSG_PEEK test for
 SOCK_SEQPACKET

Small remark on 'Subject' - this is not MSG_PEEK test, it is test for sk_buff merging.

Considering that:

Reviewed-by: Arseniy Krasnov <avkrasnov@...utedevices.com>

Thanks, Arseniy

On 15.09.2023 15:14, Stefano Garzarella wrote:
> The test was a bit complicated to read.
> Added variables to keep track of the bytes read and to be read
> in each step. Also some comments.
> 
> The test is unchanged.
> 
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
> ---
>  tools/testing/vsock/vsock_test.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
> index b18acbaf92e2..5743dcae2350 100644
> --- a/tools/testing/vsock/vsock_test.c
> +++ b/tools/testing/vsock/vsock_test.c
> @@ -1002,6 +1002,7 @@ static void test_stream_virtio_skb_merge_client(const struct test_opts *opts)
>  
>  static void test_stream_virtio_skb_merge_server(const struct test_opts *opts)
>  {
> +	size_t read = 0, to_read;
>  	unsigned char buf[64];
>  	int fd;
>  
> @@ -1014,14 +1015,21 @@ static void test_stream_virtio_skb_merge_server(const struct test_opts *opts)
>  	control_expectln("SEND0");
>  
>  	/* Read skbuff partially. */
> -	recv_buf(fd, buf, 2, 0, 2);
> +	to_read = 2;
> +	recv_buf(fd, buf + read, to_read, 0, to_read);
> +	read += to_read;
>  
>  	control_writeln("REPLY0");
>  	control_expectln("SEND1");
>  
> -	recv_buf(fd, buf + 2, 8, 0, 8);
> +	/* Read the rest of both buffers */
> +	to_read = strlen(HELLO_STR WORLD_STR) - read;
> +	recv_buf(fd, buf + read, to_read, 0, to_read);
> +	read += to_read;
>  
> -	recv_buf(fd, buf, sizeof(buf) - 8 - 2, MSG_DONTWAIT, -EAGAIN);
> +	/* No more bytes should be there */
> +	to_read = sizeof(buf) - read;
> +	recv_buf(fd, buf + read, to_read, MSG_DONTWAIT, -EAGAIN);
>  
>  	if (memcmp(buf, HELLO_STR WORLD_STR, strlen(HELLO_STR WORLD_STR))) {
>  		fprintf(stderr, "pattern mismatch\n");