netdev - Re: [PATCHv2 net] ipvs: call ip_vs_dst_notifier earlier than ipv6_dev

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Message-ID: <20181117111540.ztvaxhoxrpd2h7zv@salvia>
Date:   Sat, 17 Nov 2018 12:15:40 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Simon Horman <horms@...ge.net.au>
Cc:     Julian Anastasov <ja@....bg>, Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>,
        netfilter-devel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Hans Schillstrom <hans@...illstrom.com>
Subject: Re: [PATCHv2 net] ipvs: call ip_vs_dst_notifier earlier than
 ipv6_dev_notf

On Fri, Nov 16, 2018 at 06:37:19AM -0800, Simon Horman wrote:
> On Fri, Nov 16, 2018 at 09:10:16AM +0200, Julian Anastasov wrote:
> > 
> > 	Hello,
> > 
> > On Thu, 15 Nov 2018, Xin Long wrote:
> > 
> > > ip_vs_dst_event is supposed to clean up all dst used in ipvs'
> > > destinations when a net dev is going down. But it works only
> > > when the dst's dev is the same as the dev from the event.
> > > 
> > > Now with the same priority but late registration,
> > > ip_vs_dst_notifier is always called later than ipv6_dev_notf
> > > where the dst's dev is set to lo for NETDEV_DOWN event.
> > > 
> > > As the dst's dev lo is not the same as the dev from the event
> > > in ip_vs_dst_event, ip_vs_dst_notifier doesn't actually work.
> > > Also as these dst have to wait for dest_trash_timer to clean
> > > them up. It would cause some non-permanent kernel warnings:
> > > 
> > >   unregister_netdevice: waiting for br0 to become free. Usage count = 3
> > > 
> > > To fix it, call ip_vs_dst_notifier earlier than ipv6_dev_notf
> > > by increasing its priority to ADDRCONF_NOTIFY_PRIORITY + 5.
> > > 
> > > Note that for ipv4 route fib_netdev_notifier doesn't set dst's
> > > dev to lo in NETDEV_DOWN event, so this fix is only needed when
> > > IP_VS_IPV6 is defined.
> > > 
> > > v1->v2:
> > >   - apply it only when CONFIG_IP_VS_IPV6 is defined.
> > > 
> > > Fixes: 7a4f0761fce3 ("IPVS: init and cleanup restructuring")
> > > Reported-by: Li Shuang <shuali@...hat.com>
> > > Signed-off-by: Xin Long <lucien.xin@...il.com>
> > 
> > Acked-by: Julian Anastasov <ja@....bg>
> 
> Thanks,
> 
> Pablo, could you consider this for nf?
> 
> Acked-by: Simon Horman <horms@...ge.net.au>

Applied, thanks Simon.