netdev - Re: [PATCH net-next 1/2] net: hns3: adds support for dynamic VLAN mode

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Date:   Thu, 21 May 2020 09:33:14 +0800
From:   tanhuazhong <tanhuazhong@...wei.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <salil.mehta@...wei.com>,
        <yisen.zhuang@...wei.com>, <linuxarm@...wei.com>,
        GuoJia Liao <liaoguojia@...wei.com>
Subject: Re: [PATCH net-next 1/2] net: hns3: adds support for dynamic VLAN
 mode



On 2020/5/21 5:06, Jakub Kicinski wrote:
> On Wed, 20 May 2020 09:20:12 +0800 Huazhong Tan wrote:
>> From: GuoJia Liao <liaoguojia@...wei.com>
>>
>> There is a scenario which needs vNICs enable the VLAN filter
>> in access port, while disable the VLAN filter in trunk port.
>> Access port and trunk port can switch according to the user's
>> configuration.
>>
>> This patch adds support for the dynamic VLAN mode. then the
>> HNS3 driver can support two VLAN modes: default VLAN mode and
>> dynamic VLAN mode. User can switch the mode through the
>> configuration file.
> 
> What configuration file? Sounds like you're reimplementing trusted
> VFs (ndo_set_vf_trust).
> 

Hi, Jakub.

Maybe this configuration file here is a little misleading,
this VLAN mode is decided by the firmware, the driver will
query the VLAN mode from firmware during  intializing.

I will modified this description in V2. BTW, is there any
other suggestion about this patch?

Thanks:)


>> In default VLAN mode, port based VLAN filter and VF VLAN
>> filter should always be enabled.
>>
>> In dynamic VLAN mode, port based VLAN filter is disabled, and
>> VF VLAN filter is disabled defaultly, and should be enabled
>> when there is a non-zero VLAN ID. In addition, VF VLAN filter
>> is enabled if PVID is enabled for vNIC.
>>
>> When enable promisc, VLAN filter should be disabled. When disable
>> promisc, VLAN filter's status depends on the value of
>> 'vport->vf_vlan_en', which is used to record the VF VLAN filter
>> status.
>>
>> In default VLAN mode, 'vport->vf_vlan_en' always be 'true', so
>> VF VLAN filter will set to be enabled after disabling promisc.
>>
>> In dynamic VLAN mode, 'vport->vf_vlan_en' lies on whether there
>> is a non-zero VLAN ID.
>>
>> Signed-off-by: GuoJia Liao <liaoguojia@...wei.com>
>> Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
> 
> .
>