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Subject: Re: [PATCH net-next 2/9] net: bridge: offload initial and final port
 flags through switchdev
To:     Vladimir Oltean <olteanv@gmail.com>
CC:     Jakub Kicinski <kuba@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Andrew Lunn <andrew@lunn.ch>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <bridge@lists.linux-foundation.org>,
        "Roopa Prabhu" <roopa@nvidia.com>, Jiri Pirko <jiri@resnulli.us>,
        Ido Schimmel <idosch@idosch.org>,
        Claudiu Manoil <claudiu.manoil@nxp.com>,
        "Alexandre Belloni" <alexandre.belloni@bootlin.com>,
        <UNGLinuxDriver@microchip.com>, Vadym Kochan <vkochan@marvell.com>,
        Taras Chornyi <tchornyi@marvell.com>,
        Grygorii Strashko <grygorii.strashko@ti.com>,
        Ioana Ciornei <ioana.ciornei@nxp.com>,
        Ivan Vecera <ivecera@redhat.com>, <linux-omap@vger.kernel.org>
References: <20210207232141.2142678-1-olteanv@gmail.com>
 <20210207232141.2142678-3-olteanv@gmail.com>
 <95dede91-56aa-1852-8fbf-71d446fa7ede@nvidia.com>
 <20210208114511.xtzma5byrdnr5s7r@skbuf>
From:   Nikolay Aleksandrov <nikolay@nvidia.com>
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On 08/02/2021 13:45, Vladimir Oltean wrote:
> On Mon, Feb 08, 2021 at 01:37:03PM +0200, Nikolay Aleksandrov wrote:
>> Hi Vladimir,
>> I think this patch potentially breaks some use cases. There are a few problems, I'll
>> start with the more serious one: before the ports would have a set of flags that were
>> always set when joining, now due to how nbp_flags_change() handles flag setting some might
>> not be set which would immediately change behaviour w.r.t software fwding. I'll use your
>> example of BR_BCAST_FLOOD: a lot of drivers will return an error for it and any broadcast
>> towards these ports will be dropped, we have mixed environments with software ports that
>> sometimes have traffic (e.g. decapped ARP requests) software forwarded which will stop working.
> 
> Yes, you're right. The only solution I can think of is to add a "bool ignore_errors"
> to nbp_flags_change, set to true from new_nbp and del_nbp, and to false from the
> netlink code.
> 

Indeed, I can't think of any better solution right now, but that would make it more or less
equal to the current situation where the flags are just set. You can read/restore them on add/del
of bridge port, but I guess that's what you'd like to avoid. :)
I don't mind adding the add/del_nbp() notifications, but both of them seem redundant with
the port add/del notifications which you can handle in the driver.

>> The other lesser issue is with the style below, I mean these three calls for each flag are
>> just ugly and look weird as you've also noted, since these APIs are internal can we do better?
> 
> Doing better would mean allowing nbp_flags_change() to have a bit mask with
> potentially more brport flags set, and to call br_switchdev_set_port_flag in
> a for_each_set_bit() loop?
> 

Sure, that sounds better for now. I think you've described the ideal case in your
commit message.