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Message-ID: <07f5a4cb-2a55-c774-6b23-d3fa6605cb43@nvidia.com>
Date: Tue, 31 Jan 2023 13:42:53 +0200
From: Eli Cohen <elic@...dia.com>
To: Si-Wei Liu <si-wei.liu@...cle.com>, mst@...hat.com,
jasowang@...hat.com, parav@...dia.com
Cc: virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] vdpa: fix improper error message when adding vdpa dev
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@...cle.com>
> Acked-by: Jason Wang <jasowang@...hat.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);
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