Re: [dpdk-stable] [dpdk-dev] [PATCH v2 3/3] virtio-user: set status on virtio-user reconnect

["Jiang, YuX" <yux.jiang@intel.com>]

Tested-by: JiangYuX <yux.jiang@intel.com>

    Best Regards
    Jiang yu


> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Maxime Coquelin
> Sent: Thursday, October 22, 2020 4:32 PM
> To: Adrian Moreno <amorenoz@redhat.com>; Xia, Chenbo
> <chenbo.xia@intel.com>; Wang, Yinan <yinan.wang@intel.com>;
> dev@dpdk.org
> Cc: Fu, Patrick <patrick.fu@intel.com>; stable@dpdk.org; Wang, Zhihong
> <zhihong.wang@intel.com>; Xu, Qian Q <qian.q.xu@intel.com>
> Subject: Re: [dpdk-dev] [PATCH v2 3/3] virtio-user: set status on virtio-user
> reconnect
> 
> 
> 
> On 10/22/20 10:12 AM, Adrian Moreno wrote:
> >
> >
> > On 10/22/20 9:37 AM, Xia, Chenbo wrote:
> >> Hi Maxime,
> >>
> >>> -----Original Message-----
> >>> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> >>> Sent: Thursday, October 22, 2020 3:14 PM
> >>> To: Wang, Yinan <yinan.wang@intel.com>; Adrian Moreno
> >>> <amorenoz@redhat.com>; dev@dpdk.org; Xia, Chenbo
> >>> <chenbo.xia@intel.com>
> >>> Cc: Fu, Patrick <patrick.fu@intel.com>; stable@dpdk.org; Wang,
> >>> Zhihong <zhihong.wang@intel.com>; Xu, Qian Q <qian.q.xu@intel.com>
> >>> Subject: Re: [PATCH v2 3/3] virtio-user: set status on virtio-user
> >>> reconnect
> >>>
> >>> Hi Yinan,
> >>>
> >>> On 10/22/20 6:01 AM, Wang, Yinan wrote:
> >>>> Hi Maxime/ Adrian，
> >>>>
> >>>> Thanks for the patch.  we can launch vhost-user with client mode
> >>>> with
> >>> this fix patch.
> >>>> But still fail to get throughput with basic vhost/virtio-user
> >>>> server
> >>> mode loopback test. This is another problem which introduced by
> >>> 57912824615fd7787a48a7b18e40661466.
> >>>> Bugzilla: https://bugs.dpdk.org/show_bug.cgi?id=541
> >>>
> >>> Thanks for reporting the issue, I will look at it this morning.
> >>>
> >>> BTW, this virtio-user server mode is broken by design, we should
> >>> really fix it.
> >>>
> >>> For example, it assumes features to be supported by the backend
> >>> before the negotiation took place:
> >>> https://git.dpdk.org/dpdk/tree/drivers/net/virtio/virtio_user/virtio
> >>> _user_
> >>> dev.c#n513
> >>>
> >>> As part of my rework, I suggest we implement the same behaviour as
> >>> QEMU does, which will be reliable and consistent with QEMU. It means
> >>> that if server mode is enabled in device command-line, the driver
> >>> waits until the socket is ready.
> >>>
> >>> Chenbo, Adrian, what do you think?
> >>
> >> Yes! I totally agree and have the same opinion for a long time. As I
> >> remember, this feature assumption has caused problems before and I
> >> notice the new STATUS feature is also affected. It's good to make this
> consistent with QEMU 😊.
> >>
> > +1
> >
> > In fact, I was looking into how to get rid of some error messages
> > originated during the initialization of the virtio-pci layer when the
> > socket is still not ready.
> 
> Is that the error messages you meant?
> 
> 
> virtio_user_send_status_update(): VHOST_USER_SET_STATUS failed (-1):
> Success
> virtio_user_update_status(): VHOST_USER_GET_STATUS failed (-1): Success
> virtio_user_update_status(): VHOST_USER_GET_STATUS failed (-1): Success
> virtio_user_send_status_update(): VHOST_USER_SET_STATUS failed (-1):
> Success
> virtio_user_update_status(): VHOST_USER_GET_STATUS failed (-1): Success
> virtio_user_send_status_update(): VHOST_USER_SET_STATUS failed (-1):
> Success
> virtio_user_update_status(): VHOST_USER_GET_STATUS failed (-1): Success
> virtio_user_send_status_update(): VHOST_USER_SET_STATUS failed (-1):
> Success
> virtio_user_update_status(): VHOST_USER_GET_STATUS failed (-1): Success
> virtio_user_update_status(): VHOST_USER_GET_STATUS failed (-1): Success
> virtio_user_send_status_update(): VHOST_USER_SET_STATUS failed (-1):
> Success
> 
> 
> That would be good to have them fixed
> 
> >
> >> Cheers,
> >> Chenbo
> >>
> >>>
> >>> Thanks,
> >>> Maxime
> >>>
> >>>> BR,
> >>>> Yinan
> >>>>> -----Original Message-----
> >>>>> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> >>>>> Sent: 2020年10月21日 0:43
> >>>>> To: Adrian Moreno <amorenoz@redhat.com>; dev@dpdk.org
> >>>>> Cc: Wang, Yinan <yinan.wang@intel.com>; Fu, Patrick
> >>> <patrick.fu@intel.com>;
> >>>>> stable@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; Wang,
> Zhihong
> >>>>> <zhihong.wang@intel.com>
> >>>>> Subject: Re: [PATCH v2 3/3] virtio-user: set status on virtio-user
> >>> reconnect
> >>>>>
> >>>>>
> >>>>>
> >>>>> On 10/20/20 5:20 PM, Adrian Moreno wrote:
> >>>>>> Newer vhost-user backends will rely on SET_STATUS to start the
> >>>>>> device so this required to support them.
> >>>>>>
> >>>>>> Fixes: 57912824615f ("net/virtio-user: support vhost status
> >>>>>> setting")
> >>>>>> Cc: maxime.coquelin@redhat.com
> >>>>>> Cc: stable@dpdk.org
> >>>>>>
> >>>>>> Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
> >>>>>> ---
> >>>>>>  drivers/net/virtio/virtio_user_ethdev.c | 14 ++++++++++++--
> >>>>>>  1 file changed, 12 insertions(+), 2 deletions(-)
> >>>>>>
> >>>>>> diff --git a/drivers/net/virtio/virtio_user_ethdev.c
> >>>>> b/drivers/net/virtio/virtio_user_ethdev.c
> >>>>>> index e870fb2ff..d8bea4537 100644
> >>>>>> --- a/drivers/net/virtio/virtio_user_ethdev.c
> >>>>>> +++ b/drivers/net/virtio/virtio_user_ethdev.c
> >>>>>> @@ -78,6 +78,13 @@ virtio_user_server_reconnect(struct
> >>>>>> virtio_user_dev
> >>>>> *dev)
> >>>>>>  		return -1;
> >>>>>>
> >>>>>>  	dev->vhostfd = connectfd;
> >>>>>> +
> >>>>>> +	vtpci_reset(hw);
> >>>>>> +
> >>>>>> +	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
> >>>>>> +
> >>>>>> +	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
> >>>>>> +
> >>>>>>  	if (dev->ops->send_request(dev,
> VHOST_USER_GET_FEATURES,
> >>>>>>  				   &dev->device_features) < 0) {
> >>>>>>  		PMD_INIT_LOG(ERR, "get_features failed: %s", @@ -
> 111,6 +118,8
> >>>>>> @@ virtio_user_server_reconnect(struct
> >>> virtio_user_dev
> >>>>> *dev)
> >>>>>>
> >>>>>>  	dev->features &= dev->device_features;
> >>>>>>
> >>>>>> +	vtpci_set_status(hw,
> VIRTIO_CONFIG_STATUS_FEATURES_OK);
> >>>>>> +
> >>>>>>  	/* For packed ring, resetting queues is required in
> reconnection. */
> >>>>>>  	if (vtpci_packed_queue(hw) &&
> >>>>>>  	   (vtpci_get_status(hw) &
> VIRTIO_CONFIG_STATUS_DRIVER_OK)) {
> >>>>>> @@ -119,8 +128,9 @@ virtio_user_server_reconnect(struct
> >>> virtio_user_dev
> >>>>> *dev)
> >>>>>>  		virtio_user_reset_queues_packed(eth_dev);
> >>>>>>  	}
> >>>>>>
> >>>>>> -	ret = virtio_user_start_device(dev);
> >>>>>> -	if (ret < 0)
> >>>>>> +	/*  Start the device */
> >>>>>> +	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
> >>>>>> +	if (!dev->started)
> >>>>>>  		return -1;
> >>>>>>
> >>>>>>  	if (dev->queue_pairs > 1) {
> >>>>>>
> >>>>>
> >>>>> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >>>>>
> >>>>> Thanks,
> >>>>> Maxime
> >>>>
> >>
> >