On Tue, Jan 02, 2024 at 01:14:21PM +0100, Nicolas Dichtel wrote:
Le 01/01/2024 à 23:10, Phil Sutter a écrit :
On Fri, Dec 29, 2023 at 11:08:35AM +0100, Nicolas Dichtel wrote:
The below commit adds support for:
ip link set dummy0 down ip link set dummy0 master bond0 up
but breaks the opposite:
ip link set dummy0 up ip link set dummy0 master bond0 down
Let's add a workaround to have both commands working.
Cc: stable@vger.kernel.org Fixes: a4abfa627c38 ("net: rtnetlink: Enslave device before bringing it up") Signed-off-by: Nicolas Dichtel nicolas.dichtel@6wind.com
net/core/rtnetlink.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index e8431c6c8490..dd79693c2d91 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2905,6 +2905,14 @@ static int do_setlink(const struct sk_buff *skb, call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); }
- /* Backward compat: enable to set interface down before enslaving it */
- if (!(ifm->ifi_flags & IFF_UP) && ifm->ifi_change & IFF_UP) {
err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),extack);if (err < 0)goto errout;- }
- if (tb[IFLA_MASTER]) { err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); if (err)
Doesn't this merely revert to the old behaviour of setting the interface up before enslaving if both IFF_UP and IFLA_MASTER are present? Did you test this with a bond-type master?
Yes, both command sequences (cf commit log) work after the patch. dev_change_flags() is called before do_set_master() only if the user asks to remove the flag IFF_UP.
Ah, indeed! I should have looked at rtnl_dev_combine_flags() before commenting. When submitting v2, feel free to add my:
Acked-by: Phil Sutter phil@nwl.cc
Thanks, Phil