linux-kernel - Re: [PATCH net-next v7 5/6] net: marvell: prestera: Add Switchdev driver implementation

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Date:   Thu, 10 Sep 2020 10:03:16 +0300
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Andrew Lunn <andrew@...n.ch>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Andrii Savka <andrii.savka@...ision.eu>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mickey Rachamim <mickeyr@...vell.com>
Subject: Re: [PATCH net-next v7 5/6] net: marvell: prestera: Add Switchdev
 driver implementation

Hi Andy,

On Fri, Sep 04, 2020 at 10:41:17PM +0300, Andy Shevchenko wrote:
> On Fri, Sep 4, 2020 at 7:52 PM Vadym Kochan <vadym.kochan@...ision.eu> wrote:
> >
> > The following features are supported:
> >
> >     - VLAN-aware bridge offloading
> >     - VLAN-unaware bridge offloading
> >     - FDB offloading (learning, ageing)
> >     - Switchport configuration
> >
> > Currently there are some limitations like:
> >
> >     - Only 1 VLAN-aware bridge instance supported
> >     - FDB ageing timeout parameter is set globally per device
> 
> Similar comments as per previous patches.
> 
> > +       struct list_head vlans_list;
> 
> How this container is being protected against races?
> 

It should be protected by rtnl lock from the Switchdev core:

    net/switchdev/switchdev.c:int switchdev_port_obj_add(...)

which is called by:

    net/bridge/br_switchdev.c:int br_switchdev_port_vlan_add(...)

> -- 
> With Best Regards,
> Andy Shevchenko