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Subject: Re: [PATCH v2 10/11] vsock_test: skip read() in test_stream*close
 tests on a VMCI host
To:     Stefano Garzarella <sgarzare@redhat.com>, netdev@vger.kernel.org
Cc:     kvm@vger.kernel.org, Stefan Hajnoczi <stefanha@redhat.com>,
        Dexuan Cui <decui@microsoft.com>,
        virtualization@lists.linux-foundation.org,
        "David S. Miller" <davem@davemloft.net>,
        Jorgen Hansen <jhansen@vmware.com>,
        linux-kernel@vger.kernel.org
References: <20190801152541.245833-1-sgarzare@redhat.com>
 <20190801152541.245833-11-sgarzare@redhat.com>
From:   Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Organization: Cogent Embedded
Message-ID: <79ffb2a6-8ed2-cce2-7704-ed872446c0fe@cogentembedded.com>
Date:   Thu, 1 Aug 2019 18:53:32 +0300
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Hello!

On 08/01/2019 06:25 PM, Stefano Garzarella wrote:

> When VMCI transport is used, if the guest closes a connection,
> all data is gone and EOF is returned, so we should skip the read
> of data written by the peer before closing the connection.
> 
> Reported-by: Jorgen Hansen <jhansen@vmware.com>
> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
> ---
>  tools/testing/vsock/vsock_test.c | 26 ++++++++++++++++++++++++--
>  1 file changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
> index cb606091489f..64adf45501ca 100644
> --- a/tools/testing/vsock/vsock_test.c
> +++ b/tools/testing/vsock/vsock_test.c
[...]
> @@ -79,16 +80,27 @@ static void test_stream_client_close_server(const struct test_opts *opts)
>  		exit(EXIT_FAILURE);
>  	}
>  
> +	local_cid = vsock_get_local_cid(fd);
> +
>  	control_expectln("CLOSED");
>  
>  	send_byte(fd, -EPIPE);
> -	recv_byte(fd, 1);
> +
> +	/* Skip the read of data wrote by the peer if we are on VMCI and

   s/wrote/written/?

> +	 * we are on the host side, because when the guest closes a
> +	 * connection, all data is gone and EOF is returned.
> +	 */
> +	if (!(opts->transport == TEST_TRANSPORT_VMCI &&
> +	    local_cid == VMADDR_CID_HOST))
> +		recv_byte(fd, 1);
> +
>  	recv_byte(fd, 0);
>  	close(fd);
>  }
[...]

MBR, Sergei