linux-kernel - Re: [PATCH net RESEND] net: ethernet: ti: am65-cpsw: Add IFF_UNICAST

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Date: Fri, 1 Mar 2024 16:39:50 +0530
From: Ravi Gunasekaran <r-gunasekaran@...com>
To: Jakub Kicinski <kuba@...nel.org>,
        Sanjuán García, Jorge <Jorge.SanjuanGarcia@...gon.com>
CC: "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com"
	<edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "s-vadapalli@...com" <s-vadapalli@...com>,
        "rogerq@...nel.org"
	<rogerq@...nel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "olteanv@...il.com"
	<olteanv@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ravi
 Gunasekaran <r-gunasekaran@...com>
Subject: Re: [PATCH net RESEND] net: ethernet: ti: am65-cpsw: Add
 IFF_UNICAST_FLT flag to port device



On 2/29/24 9:35 AM, Jakub Kicinski wrote:
> On Wed, 28 Feb 2024 11:13:23 +0000 Sanjuán García, Jorge wrote:
>> Since commit 8940e6b669ca ("net: dsa: avoid call to __dev_set_promiscuity()
>> while rtnl_mutex isn't held") when conecting one of this switch's port
>> to a DSA switch as the conduit interface, the network interface is set to
>> promiscuous mode by default and cannot be set to not promiscuous mode again
>> from userspace. The reason for this is that the cpsw ports net devices
>> do not have the flag IFF_UNICAST_FLT set in their private flags.
>>
>> The cpsw switch should be able to set not promiscuous mode as otherwise
>> a '1' is written to bit ALE_PORT_MACONLY_CAF which makes ethernet frames
>> get an additional VLAN tag when entering the port connected to the DSA
>> switch. Setting the IFF_UNICAST_FLT flag to all ports allows us to have
>> the conduit interface on the DSA subsystem set as not promiscuous.
> 
> It doesn't look like am65-cpsw-nuss supports unicast filtering, 
> tho, does it? So we're lying about support to work around some 
> CPSW weirdness (additional VLAN tag thing)?

CPSW driver does not support unicast filtering. 

-- 
Regards,
Ravi