Re: [Qemu-devel] [PATCH V2 2/2] tests/vhost-user: check vhost-user feature negotiation

[Marcel Apfelbaum <marcel@redhat.com>]

On 07/30/2015 09:47 AM, Michael S. Tsirkin wrote:
> On Wed, Jul 29, 2015 at 11:06:49PM +0300, Marcel Apfelbaum wrote:
>> Check the backend receives all declared virtio features
>> that are also supported by QEMU virtio.
>>
>> Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
>> ---
>>   tests/vhost-user-test.c | 19 ++++++++++++++++---
>>   1 file changed, 16 insertions(+), 3 deletions(-)
>>
>> diff --git a/tests/vhost-user-test.c b/tests/vhost-user-test.c
>> index 228acb6..019b880 100644
>> --- a/tests/vhost-user-test.c
>> +++ b/tests/vhost-user-test.c
>> @@ -17,6 +17,7 @@
>>   #include "sysemu/sysemu.h"
>>
>>   #include <linux/vhost.h>
>> +#include <linux/virtio_net.h>
>>   #include <sys/mman.h>
>>   #include <sys/vfs.h>
>>   #include <qemu/sockets.h>
>> @@ -297,14 +298,26 @@ static void chr_read(void *opaque, const uint8_t *buf, int size)
>>           /* send back features to qemu */
>>           msg.flags |= VHOST_USER_REPLY_MASK;
>>           msg.size = sizeof(m.u64);
>> -        msg.u64 = 0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES;
>> +        msg.u64 = (0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES) |
>> +                  (0x1ULL << VIRTIO_F_ANY_LAYOUT) |
>> +                  (0x1ULL << VIRTIO_F_VERSION_1)  |
>> +                  (0x1ULL << VIRTIO_NET_F_MRG_RXBUF) |
>> +                  (0x1ULL << VIRTIO_NET_F_MQ);
>>           p = (uint8_t *) &msg;
>>           qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
>>           break;
>>
>
> No, this mixes protocol features and virtio features.
> It's not what was intended.
You asked for a test that shows the problem, here it is.

We can change it as you wish, if you have a better idea, just say,
"no" doesn't help.

Thanks,
Marcel

>
>>       case VHOST_USER_SET_FEATURES:
>> -	g_assert_cmpint(msg.u64 & (0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES),
>> -			!=, 0ULL);
>> +        g_assert_cmpint(msg.u64 & (0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES),
>> +            !=, 0ULL);
>> +        g_assert_cmpint(msg.u64 & (0x1ULL << VIRTIO_F_ANY_LAYOUT),
>> +            !=, 0ULL);
>> +        g_assert_cmpint(msg.u64 & (0x1ULL << VIRTIO_F_VERSION_1),
>> +            !=, 0ULL);
>> +        g_assert_cmpint(msg.u64 & (0x1ULL << VIRTIO_NET_F_MRG_RXBUF),
>> +            !=, 0ULL);
>> +        g_assert_cmpint(msg.u64 & (0x1ULL << VIRTIO_NET_F_MQ),
>> +            !=, 0ULL);
>>           break;
>>
>>       case VHOST_USER_GET_PROTOCOL_FEATURES:
>> --
>> 2.1.0