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 03/11] net: bridge: don't print in br_switchdev_set_port_flag
Date: Tue, 9 Feb 2021 20:26:17 +0200 [thread overview]
Message-ID: <20210209182617.GB262892@shredder.lan> (raw)
In-Reply-To: <20210209173631.c75cdjxphwzipeg5@skbuf>
On Tue, Feb 09, 2021 at 07:36:31PM +0200, Vladimir Oltean wrote:
> On Tue, Feb 09, 2021 at 05:19:28PM +0200, Vladimir Oltean wrote:
> > From: Vladimir Oltean <vladimir.oltean@nxp.com>
> >
> > Currently br_switchdev_set_port_flag has two options for error handling
> > and neither is good:
> > - The driver returns -EOPNOTSUPP in PRE_BRIDGE_FLAGS if it doesn't
> > support offloading that flag, and this gets silently ignored and
> > converted to an errno of 0. Nobody does this.
> > - The driver returns some other error code, like -EINVAL, in
> > PRE_BRIDGE_FLAGS, and br_switchdev_set_port_flag shouts loudly.
> >
> > The problem is that we'd like to offload some port flags during bridge
> > join and leave, but also not have the bridge shout at us if those fail.
> > But on the other hand we'd like the user to know that we can't offload
> > something when they set that through netlink. And since we can't have
> > the driver return -EOPNOTSUPP or -EINVAL depending on whether it's
> > called by the user or internally by the bridge, let's just add an extack
> > argument to br_switchdev_set_port_flag and propagate it to its callers.
> > Then, when we need offloading to really fail silently, this can simply
> > be passed a NULL argument.
> >
> > Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
> > ---
>
> The build fails because since I started working on v2 and until I sent
> it, Jakub merged net into net-next which contained this fix:
> https://patchwork.kernel.org/project/netdevbpf/patch/20210207194733.1811529-1-olteanv@gmail.com/
> for which I couldn't change prototype due to it missing in net-next.
> I think I would like to rather wait to gather some feedback first before
> respinning v3, if possible.
It seems that in the sysfs call path br_switchdev_set_port_flag() will
be called with the bridge lock held, which is going to be a problem
given that patch #8 allows this function to block.
next prev parent reply other threads:[~2021-02-09 18:45 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 [this message]
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
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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