netdev - Re: [PATCH 2/4] vDPA: only report driver features if FEATURES

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Message-ID: <6fd1f8b3-23b1-84cc-2376-ee04f1fa8438@intel.com>
Date:   Tue, 20 Sep 2022 13:46:24 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst <mst@...hat.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>, kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/4] vDPA: only report driver features if FEATURES_OK is
 set



On 9/20/2022 10:16 AM, Jason Wang wrote:
> On Fri, Sep 9, 2022 at 5:05 PM Zhu Lingshan <lingshan.zhu@...el.com> wrote:
>> vdpa_dev_net_config_fill() should only report driver features
>> to userspace after features negotiation is done.
>>
>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>> ---
>>   drivers/vdpa/vdpa.c | 13 +++++++++----
>>   1 file changed, 9 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
>> index 798a02c7aa94..29d7e8858e6f 100644
>> --- a/drivers/vdpa/vdpa.c
>> +++ b/drivers/vdpa/vdpa.c
>> @@ -819,6 +819,7 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
>>          struct virtio_net_config config = {};
>>          u64 features_device, features_driver;
>>          u16 val_u16;
>> +       u8 status;
>>
>>          vdev->config->get_config(vdev, 0, &config, sizeof(config));
>>
>> @@ -834,10 +835,14 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
>>          if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
>>                  return -EMSGSIZE;
>>
>> -       features_driver = vdev->config->get_driver_features(vdev);
>> -       if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver,
>> -                             VDPA_ATTR_PAD))
>> -               return -EMSGSIZE;
>> +       /* only read driver features after the feature negotiation is done */
>> +       status = vdev->config->get_status(vdev);
>> +       if (status & VIRTIO_CONFIG_S_FEATURES_OK) {
> Any reason this is not checked in its caller as what it used to do before?
will check the existence of vdev->config->get_status before calling it in V2

Thanks,
Zhu Lingshan
>
> Thanks
>
>> +               features_driver = vdev->config->get_driver_features(vdev);
>> +               if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver,
>> +                                     VDPA_ATTR_PAD))
>> +                       return -EMSGSIZE;
>> +       }
>>
>>          features_device = vdev->config->get_device_features(vdev);
>>
>> --
>> 2.31.1
>>