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@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
---
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);
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