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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190130073656.GA22227@splinter> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 1/29/19 11:36 PM, Ido Schimmel wrote: > On Tue, Jan 29, 2019 at 04:55:37PM -0800, Florian Fainelli wrote: >> Some Ethernet switches might not be able to support disabling multicast >> flooding globally when e.g: several bridges span the same physical >> device, propagate the return value of br_mc_disabled_update() such that >> this propagates correctly to user-space. >> >> Signed-off-by: Florian Fainelli >> --- >> net/bridge/br_multicast.c | 23 ++++++++++++++++------- >> 1 file changed, 16 insertions(+), 7 deletions(-) >> >> diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c >> index 3aeff0895669..aff5e003d34f 100644 >> --- a/net/bridge/br_multicast.c >> +++ b/net/bridge/br_multicast.c >> @@ -813,20 +813,22 @@ static void br_ip6_multicast_port_query_expired(struct timer_list *t) >> } >> #endif >> >> -static void br_mc_disabled_update(struct net_device *dev, bool value) >> +static int br_mc_disabled_update(struct net_device *dev, bool value) >> { >> struct switchdev_attr attr = { >> .orig_dev = dev, >> .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED, >> - .flags = SWITCHDEV_F_DEFER, >> + .flags = SWITCHDEV_F_DEFER | SWITCHDEV_F_SKIP_EOPNOTSUPP, > > Actually, since the operation is deferred I don't think the return value > from the driver is ever checked. Can you test it? You are right, you get a WARN() from switchdev_attr_port_set_now(), but this does not propagate back to the caller, so you can still create a bridge device and enslave a device successfully despite getting warnings on the console. > > I think it would be good to convert the attributes to use the switchdev > notifier like commit d17d9f5e5143 ("switchdev: Replace port obj add/del > SDO with a notification") did for objects. Then you can have your > listener veto the operation in the same context it is happening. Alright, working on it. Would you do that just for the attr_set, or for attr_get as well (to be symmetrical)? -- Florian