linux-kernel - Re: [PATCH net-next v3] net: openvswitch: Check vport net device name

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Message-ID: <811765EC-AD27-4210-9AFC-034129F24BFA@redhat.com>
Date: Wed, 17 Apr 2024 12:48:38 +0200
From: Eelco Chaudron <echaudro@...hat.com>
To: "jun.gu" <jun.gu@...ystack.cn>
Cc: dev@...nvswitch.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3] net: openvswitch: Check vport net device name

On 17 Apr 2024, at 6:20, jun.gu wrote:

> Check vport net device name to ensure the provided name is not one of
> its aliases. This can avoid that ovs userspace create and destroy vport
> repeatedly.

How about changing the text to the following?

  Ensure that the provided netdev name is not one of its aliases to prevent unnecessary creation and destruction of the vport by ovs-vswitchd.

Maybe the maintainers are fine with the current text, in that case:

Acked-by: Eelco Chaudron <echaudro@...hat.com>

>
> Signed-off-by: Jun Gu <jun.gu@...ystack.cn>
> ---
>  net/openvswitch/vport-netdev.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
> index 903537a5da22..7003e76b8172 100644
> --- a/net/openvswitch/vport-netdev.c
> +++ b/net/openvswitch/vport-netdev.c
> @@ -78,7 +78,10 @@ struct vport *ovs_netdev_link(struct vport *vport, const char *name)
>  	int err;
>
>  	vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
> -	if (!vport->dev) {
> +	/* Ensure that the device exists and that the provided
> +	 * name is not one of its aliases.
> +	 */
> +	if ((!vport->dev) || strcmp(name, ovs_vport_name(vport))) {
>  		err = -ENODEV;
>  		goto error_free_vport;
>  	}
> -- 
> 2.25.1