netdev - Re: [PATCH linux-next v2 7/7] vdpa_sim_net: Add support for user supported devices

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Date:   Tue, 5 Jan 2021 12:06:07 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Parav Pandit <parav@...dia.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
Cc:     "mst@...hat.com" <mst@...hat.com>, Eli Cohen <elic@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH linux-next v2 7/7] vdpa_sim_net: Add support for user
 supported devices


On 2021/1/4 下午3:21, Parav Pandit wrote:
>
>> From: Jason Wang <jasowang@...hat.com>
>> Sent: Monday, January 4, 2021 12:35 PM
>>
>> On 2021/1/4 上午11:31, Parav Pandit wrote:
>>>    static int __init vdpasim_net_init(void)
>>>    {
>>>    	int ret = 0;
>>> @@ -176,6 +264,8 @@ static int __init vdpasim_net_init(void)
>>>
>>>    	if (default_device)
>>>    		ret = vdpasim_net_default_dev_register();
>>> +	else
>>> +		ret = vdpasim_net_mgmtdev_init();
>>>    	return ret;
>>>    }
>>>
>>> @@ -183,6 +273,8 @@ static void __exit vdpasim_net_exit(void)
>>>    {
>>>    	if (default_device)
>>>    		vdpasim_net_default_dev_unregister();
>>> +	else
>>> +		vdpasim_net_mgmtdev_cleanup();
>>>    }
>>>
>>>    module_init(vdpasim_net_init);
>>> -- 2.26.2
>>
>> I wonder what's the value of keeping the default device that is out of the
>> control of management API.
> I think we can remove it like how I did in the v1 version. And actual vendor drivers like mlx5_vdpa will likely should do only user created devices.
> I added only for backward compatibility purpose, but we can remove the default simulated vdpa net device.
> What do you recommend?


I think we'd better mandate this management API. This can avoid vendor 
specific configuration that may complex management layer.

Thanks