From: Ido Schimmel <idosch@idosch.org>
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>,
Nikolay Aleksandrov <nikolay@nvidia.com>,
Jiri Pirko <jiri@resnulli.us>,
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
Subject: Re: [PATCH v2 net-next 04/11] net: bridge: offload initial and final port flags through switchdev
Date: Wed, 10 Feb 2021 00:01:24 +0200 [thread overview]
Message-ID: <20210209220124.GA271860@shredder.lan> (raw)
In-Reply-To: <20210209202045.obayorcud4fg2qqb@skbuf>
On Tue, Feb 09, 2021 at 10:20:45PM +0200, Vladimir Oltean wrote:
> On Tue, Feb 09, 2021 at 08:51:00PM +0200, Ido Schimmel wrote:
> > On Tue, Feb 09, 2021 at 05:19:29PM +0200, Vladimir Oltean wrote:
> > > So switchdev drivers operating in standalone mode should disable address
> > > learning. As a matter of practicality, we can reduce code duplication in
> > > drivers by having the bridge notify through switchdev of the initial and
> > > final brport flags. Then, drivers can simply start up hardcoded for no
> > > address learning (similar to how they already start up hardcoded for no
> > > forwarding), then they only need to listen for
> > > SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS and their job is basically done, no
> > > need for special cases when the port joins or leaves the bridge etc.
> >
> > How are you handling the case where a port leaves a LAG that is linked
> > to a bridge? In this case the port becomes a standalone port, but will
> > not get this notification.
>
> Apparently the answer to that question is "I delete the code that makes
> this use case work", how smart of me. Thanks.
Not sure how you expect to interpret this.
>
> Unless you have any idea how I could move the logic into the bridge, I
> guess I'm stuck with DSA and all the other switchdev drivers having this
> forest of corner cases to deal with. At least I can add a comment so I'm
> not tempted to delete it next time.
There are too many moving pieces with stacked devices. It is not only
LAG/bridge. In L3 you have VRFs, SVIs, macvlans etc. It might be better
to gracefully / explicitly not handle a case rather than pretending to
handle it correctly with complex / buggy code.
For example, you should refuse to be enslaved to a LAG that already has
upper devices such as a bridge. You are probably not handling this
correctly / at all. This is easy. Just a call to
netdev_has_any_upper_dev().
The reverse, during unlinking, would be to refuse unlinking if the upper
has uppers of its own. netdev_upper_dev_unlink() needs to learn to
return an error and callers such as team/bond need to learn to handle
it, but it seems patchable.
next prev parent reply other threads:[~2021-02-09 23:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-09 15:19 [PATCH v2 net-next 00/11] Cleanup in brport flags switchdev offload for DSA Vladimir Oltean
2021-02-09 15:19 ` [PATCH v2 net-next 01/11] net: switchdev: propagate extack to port attributes Vladimir Oltean
2021-02-09 18:00 ` Ido Schimmel
2021-02-09 15:19 ` [PATCH v2 net-next 02/11] net: bridge: offload all port flags at once in br_setport Vladimir Oltean
2021-02-09 18:27 ` Vladimir Oltean
2021-02-09 18:36 ` Vladimir Oltean
2021-02-09 15:19 ` [PATCH v2 net-next 03/11] net: bridge: don't print in br_switchdev_set_port_flag Vladimir Oltean
2021-02-09 17:36 ` Vladimir Oltean
2021-02-09 18:26 ` Ido Schimmel
2021-02-09 15:19 ` [PATCH v2 net-next 04/11] net: bridge: offload initial and final port flags through switchdev Vladimir Oltean
2021-02-09 18:51 ` Ido Schimmel
2021-02-09 20:20 ` Vladimir Oltean
2021-02-09 22:01 ` Ido Schimmel [this message]
2021-02-09 22:51 ` Vladimir Oltean
2021-02-10 10:59 ` Ido Schimmel
2021-02-10 23:23 ` Vladimir Oltean
2021-02-11 7:44 ` Ido Schimmel
2021-02-11 9:35 ` Vladimir Oltean
2021-02-11 22:20 ` Ido Schimmel
2021-02-09 15:19 ` [PATCH v2 net-next 05/11] net: dsa: stop setting initial and final brport flags Vladimir Oltean
2021-02-09 15:19 ` [PATCH v2 net-next 06/11] net: squash switchdev attributes PRE_BRIDGE_FLAGS and BRIDGE_FLAGS Vladimir Oltean
2021-02-09 15:19 ` [PATCH v2 net-next 07/11] net: dsa: kill .port_egress_floods overengineering Vladimir Oltean
2021-02-09 20:37 ` Vladimir Oltean
2021-02-09 21:29 ` Florian Fainelli
2021-02-09 15:19 ` [PATCH v2 net-next 08/11] net: bridge: put SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS on the blocking call chain Vladimir Oltean
2021-02-09 15:19 ` [PATCH v2 net-next 09/11] net: mscc: ocelot: use separate flooding PGID for broadcast Vladimir Oltean
2021-02-09 15:19 ` [PATCH v2 net-next 10/11] net: mscc: ocelot: offload bridge port flags to device Vladimir Oltean
2021-02-09 15:19 ` [PATCH v2 net-next 11/11] net: dsa: sja1105: " Vladimir Oltean
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