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[PATCH 1/6] vdpa: fix improper error message when adding vdpa dev

Si-Wei Liu posted 6 patches 3 years ago
There is a newer version of this series
[PATCH 1/6] vdpa: fix improper error message when adding vdpa dev
Posted by Si-Wei Liu 3 years ago 
In below example, before the fix, mtu attribute is supported
by the parent mgmtdev, but the error message showing "All
provided are not supported" is just misleading.

$ vdpa mgmtdev show
vdpasim_net:
  supported_classes net
  max_supported_vqs 3
  dev_features MTU MAC CTRL_VQ CTRL_MAC_ADDR ANY_LAYOUT VERSION_1 ACCESS_PLATFORM

$ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
Error: vdpa: All provided attributes are not supported.
kernel answers: Operation not supported

After fix, the relevant error message will be like:

$ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
Error: vdpa: Some provided attributes are not supported.
kernel answers: Operation not supported

$ vdpa dev add mgmtdev vdpasim_net name vdpasim0 max_vqp 2
Error: vdpa: All provided attributes are not supported.
kernel answers: Operation not supported

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
 drivers/vdpa/vdpa.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 8ef7aa1..5e57935 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -622,13 +622,20 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
 		err = PTR_ERR(mdev);
 		goto err;
 	}
-	if ((config.mask & mdev->config_attr_mask) != config.mask) {
+	if (config.mask && (config.mask & mdev->config_attr_mask) == 0) {
 		NL_SET_ERR_MSG_MOD(info->extack,
 				   "All provided attributes are not supported");
 		err = -EOPNOTSUPP;
 		goto err;
 	}
 
+	if ((config.mask & mdev->config_attr_mask) != config.mask) {
+		NL_SET_ERR_MSG_MOD(info->extack,
+				   "Some provided attributes are not supported");
+		err = -EOPNOTSUPP;
+		goto err;
+	}
+
 	err = mdev->ops->dev_add(mdev, name, &config);
 err:
 	up_write(&vdpa_dev_lock);
-- 
1.8.3.1
Re: [PATCH 1/6] vdpa: fix improper error message when adding vdpa dev
Posted by Eli Cohen 3 years ago 
On 30/01/2023 22:30, Si-Wei Liu wrote:
> In below example, before the fix, mtu attribute is supported
> by the parent mgmtdev, but the error message showing "All
> provided are not supported" is just misleading.
>
> $ vdpa mgmtdev show
> vdpasim_net:
>    supported_classes net
>    max_supported_vqs 3
>    dev_features MTU MAC CTRL_VQ CTRL_MAC_ADDR ANY_LAYOUT VERSION_1 ACCESS_PLATFORM
>
> $ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
> Error: vdpa: All provided attributes are not supported.
> kernel answers: Operation not supported
>
> After fix, the relevant error message will be like:
>
> $ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
> Error: vdpa: Some provided attributes are not supported.
> kernel answers: Operation not supported
>
> $ vdpa dev add mgmtdev vdpasim_net name vdpasim0 max_vqp 2
> Error: vdpa: All provided attributes are not supported.
> kernel answers: Operation not supported
>
> Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
> Acked-by: Jason Wang <jasowang@redhat.com>
> ---
>   drivers/vdpa/vdpa.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 8ef7aa1..5e57935 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -622,13 +622,20 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
>   		err = PTR_ERR(mdev);
>   		goto err;
>   	}
> -	if ((config.mask & mdev->config_attr_mask) != config.mask) {
> +	if (config.mask && (config.mask & mdev->config_attr_mask) == 0) {
If config.mask is zero than the condition is false even without the 
change so I don't see why is this change needed.
>   		NL_SET_ERR_MSG_MOD(info->extack,
>   				   "All provided attributes are not supported");
>   		err = -EOPNOTSUPP;
>   		goto err;
>   	}
>   
> +	if ((config.mask & mdev->config_attr_mask) != config.mask) {
> +		NL_SET_ERR_MSG_MOD(info->extack,
> +				   "Some provided attributes are not supported");
Changing the message is needed but maybe list the attributes that were 
specified but are not supported?
> +		err = -EOPNOTSUPP;
> +		goto err;
> +	}
> +
>   	err = mdev->ops->dev_add(mdev, name, &config);
>   err:
>   	up_write(&vdpa_dev_lock);
Re: [PATCH 1/6] vdpa: fix improper error message when adding vdpa dev
Posted by Si-Wei Liu 3 years ago 

On 1/31/2023 3:42 AM, Eli Cohen wrote:
>
> On 30/01/2023 22:30, Si-Wei Liu wrote:
>> In below example, before the fix, mtu attribute is supported
>> by the parent mgmtdev, but the error message showing "All
>> provided are not supported" is just misleading.
>>
>> $ vdpa mgmtdev show
>> vdpasim_net:
>>    supported_classes net
>>    max_supported_vqs 3
>>    dev_features MTU MAC CTRL_VQ CTRL_MAC_ADDR ANY_LAYOUT VERSION_1 
>> ACCESS_PLATFORM
>>
>> $ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
>> Error: vdpa: All provided attributes are not supported.
>> kernel answers: Operation not supported
>>
>> After fix, the relevant error message will be like:
>>
>> $ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
>> Error: vdpa: Some provided attributes are not supported.
>> kernel answers: Operation not supported
>>
>> $ vdpa dev add mgmtdev vdpasim_net name vdpasim0 max_vqp 2
>> Error: vdpa: All provided attributes are not supported.
>> kernel answers: Operation not supported
>>
>> Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
>> Acked-by: Jason Wang <jasowang@redhat.com>
>> ---
>>   drivers/vdpa/vdpa.c | 9 ++++++++-
>>   1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
>> index 8ef7aa1..5e57935 100644
>> --- a/drivers/vdpa/vdpa.c
>> +++ b/drivers/vdpa/vdpa.c
>> @@ -622,13 +622,20 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct 
>> sk_buff *skb, struct genl_info *i
>>           err = PTR_ERR(mdev);
>>           goto err;
>>       }
>> -    if ((config.mask & mdev->config_attr_mask) != config.mask) {
>> +    if (config.mask && (config.mask & mdev->config_attr_mask) == 0) {
> If config.mask is zero than the condition is false even without the 
> change so I don't see why is this change needed.
This way it spews error message when none of the attributes provided by 
user is supported by device.
I can remove the check if improving error message for the other check 
right below, but that is the expected conditional if the same error 
message has to be kept.

>> NL_SET_ERR_MSG_MOD(info->extack,
>>                      "All provided attributes are not supported");
>>           err = -EOPNOTSUPP;
>>           goto err;
>>       }
>>   +    if ((config.mask & mdev->config_attr_mask) != config.mask) {
>> +        NL_SET_ERR_MSG_MOD(info->extack,
>> +                   "Some provided attributes are not supported");
> Changing the message is needed but maybe list the attributes that were 
> specified but are not supported?
If you can live with numeric representing the attributes instead of 
straight attribute string, certainly I can do that. Or else I anticipate 
userspace to query and fail the command rather than present attribute 
strings in kernel.

-Siwei

>> +        err = -EOPNOTSUPP;
>> +        goto err;
>> +    }
>> +
>>       err = mdev->ops->dev_add(mdev, name, &config);
>>   err:
>>       up_write(&vdpa_dev_lock);

Patchew 2.1-devel-b67e4c2

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