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

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Date:   Wed, 20 May 2020 18:36:39 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     tanhuazhong <tanhuazhong@...wei.com>
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 Thu, 21 May 2020 09:33:14 +0800 tanhuazhong wrote:
> 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.

And the FW got that configuration from?

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

The other suggestion was to trusted vf. What's the difference between
trusted VF and "dynamic VLAN mode"?

> >> 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>