netdev - Re: [PATCH V4 3/6] vDPA: allow userspace to query features of a vDPA device

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Date:   Wed, 10 Aug 2022 10:51:06 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, parav@...dia.com, xieyongji@...edance.com,
        gautam.dawar@....com
Subject: Re: [PATCH V4 3/6] vDPA: allow userspace to query features of a vDPA
 device



On 8/10/2022 3:24 AM, Michael S. Tsirkin wrote:
> On Fri, Jul 22, 2022 at 07:53:06PM +0800, Zhu Lingshan wrote:
>> This commit adds a new vDPA netlink attribution
>> VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES. Userspace can query
>> features of vDPA devices through this new attr.
>>
>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>
> I think at least some discussion and documentation
> of this attribute versus VDPA_ATTR_DEV_SUPPORTED_FEATURES
> is called for.
>
> Otherwise how do people know which one to use?
>
> We can't send everyone to go read the lkml thread.
I will add comments in both this vdpa_dev_net_config_fill() and the 
header file.

Thanks,
Zhu Lingshan
>
>> ---
>>   drivers/vdpa/vdpa.c       | 13 +++++++++----
>>   include/uapi/linux/vdpa.h |  1 +
>>   2 files changed, 10 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
>> index ebf2f363fbe7..9b0e39b2f022 100644
>> --- a/drivers/vdpa/vdpa.c
>> +++ b/drivers/vdpa/vdpa.c
>> @@ -815,7 +815,7 @@ static int vdpa_dev_net_mq_config_fill(struct vdpa_device *vdev,
>>   static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
>>   {
>>   	struct virtio_net_config config = {};
>> -	u64 features;
>> +	u64 features_device, features_driver;
>>   	u16 val_u16;
>>   
>>   	vdpa_get_config_unlocked(vdev, 0, &config, sizeof(config));
>> @@ -832,12 +832,17 @@ 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 = vdev->config->get_driver_features(vdev);
>> -	if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features,
>> +	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);
>> +	if (nla_put_u64_64bit(msg, VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, features_device,
>>   			      VDPA_ATTR_PAD))
>>   		return -EMSGSIZE;
>>   
>> -	return vdpa_dev_net_mq_config_fill(vdev, msg, features, &config);
>> +	return vdpa_dev_net_mq_config_fill(vdev, msg, features_driver, &config);
>>   }
>>   
>>   static int
>> diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
>> index 25c55cab3d7c..39f1c3d7c112 100644
>> --- a/include/uapi/linux/vdpa.h
>> +++ b/include/uapi/linux/vdpa.h
>> @@ -47,6 +47,7 @@ enum vdpa_attr {
>>   	VDPA_ATTR_DEV_NEGOTIATED_FEATURES,	/* u64 */
>>   	VDPA_ATTR_DEV_MGMTDEV_MAX_VQS,		/* u32 */
>>   	VDPA_ATTR_DEV_SUPPORTED_FEATURES,	/* u64 */
>> +	VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES,	/* u64 */
>>   
>>   	VDPA_ATTR_DEV_QUEUE_INDEX,              /* u32 */
>>   	VDPA_ATTR_DEV_VENDOR_ATTR_NAME,		/* string */
>> -- 
>> 2.31.1