linux-kernel - RE: [PATCH net-next 1/1] net: stmmac: Add option for VLAN filter fail queue enable

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Date:   Wed, 6 May 2020 03:31:00 +0000
From:   "Wong, Vee Khee" <vee.khee.wong@...el.com>
To:     David Miller <davem@...emloft.net>,
        "joabreu@...opsys.com" <joabreu@...opsys.com>
CC:     "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...com" <alexandre.torgue@...com>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Ong, Boon Leong" <boon.leong.ong@...el.com>,
        "Voon, Weifeng" <weifeng.voon@...el.com>
Subject: RE: [PATCH net-next 1/1] net: stmmac: Add option for VLAN filter fail
 queue enable


> -----Original Message-----
> From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org> On
> Behalf Of David Miller
> Sent: Friday, April 24, 2020 6:53 AM
> To: Wong, Vee Khee <vee.khee.wong@...el.com>
> Cc: peppe.cavallaro@...com; alexandre.torgue@...com;
> joabreu@...opsys.com; mcoquelin.stm32@...il.com;
> netdev@...r.kernel.org; linux-stm32@...md-mailman.stormreply.com;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; Ong,
> Boon Leong <boon.leong.ong@...el.com>; Voon, Weifeng
> <weifeng.voon@...el.com>
> Subject: Re: [PATCH net-next 1/1] net: stmmac: Add option for VLAN filter fail
> queue enable
> 
> From: Wong Vee Khee <vee.khee.wong@...el.com>
> Date: Thu, 23 Apr 2020 15:00:26 +0800
> 
> > From: "Chuah, Kim Tatt" <kim.tatt.chuah@...el.com>
> >
> > Add option in plat_stmmacenet_data struct to enable VLAN Filter Fail
> > Queuing. This option allows packets that fail VLAN filter to be routed
> > to a specific Rx queue when Receive All is also set.
> >
> > When this option is enabled:
> > - Enable VFFQ only when entering promiscuous mode, because Receive All
> >   will pass up all rx packets that failed address filtering (similar to
> >   promiscuous mode).
> > - VLAN-promiscuous mode is never entered to allow rx packet to fail VLAN
> >   filters and get routed to selected VFFQ Rx queue.
> >
> > Reviewed-by: Voon Weifeng <weifeng.voon@...el.com>
> > Reviewed-by: Ong Boon Leong <boon.leong.ong@...el.com>
> > Signed-off-by: Chuah, Kim Tatt <kim.tatt.chuah@...el.com>
> > Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
> 
> Why would you be setting this with a platform attribute?  Even if the
> capability exists, wouldn't you want the user to be able to choose to opt out?

Hi Jose/David Miller,

1/ In current implementation, TSN uses VLAN filter that can either accept/reject VLAN-tagged network packets. In some situation, we do not want to drop failed packets, but instead steer the packet to a VLAN Failed Queue Channel.

2/ VLAN Fail Queue Channel will be set to use the RxQ with higheset index as per HW IP configuration because that is the least priority channel.

3/ The way user will enable this feature is through promiscuous mode settings using ifconfig. (e.g. ifconfig enp0s30f4 promisc)

4/ VLAN Filter Fail Packets Queue feature is IP version specific (only applicable to DWMAC5). I would propose we add this under platform data (e.g. dwmac-intel), so that it can be built in according to hardware on a separate patch.

Any thoughts?