From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
To: Kristian Evensen <kristian.evensen@gmail.com>
Cc: jiri@resnulli.us, David Miller <davem@davemloft.net>,
Network Development <netdev@vger.kernel.org>,
j.vosburgh@gmail.com, vfalico@gmail.com,
gospo@cumulusnetworks.com
Subject: Re: [PATCH net v4] rtnl/bond: don't send rtnl msg for unregistered iface
Date: Thu, 16 Jul 2015 11:06:42 +0200 [thread overview]
Message-ID: <55A77422.8010305@6wind.com> (raw)
In-Reply-To: <CAKfDRXjM-afW=PD77KSWU3AKk3ow_zUwb5KW3c3pSYDyAuCjqQ@mail.gmail.com>
Le 13/07/2015 16:11, Kristian Evensen a écrit :
> Hello,
>
> I have a quick question about this patch.
>
> On Wed, May 13, 2015 at 2:19 PM, Nicolas Dichtel
> <nicolas.dichtel@6wind.com> wrote:
>> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
>> index 837d30b5ffed..7b25f1ef3d75 100644
>> --- a/net/core/rtnetlink.c
>> +++ b/net/core/rtnetlink.c
>> @@ -2415,6 +2415,9 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
>> {
>> struct sk_buff *skb;
>>
>> + if (dev->reg_state != NETREG_REGISTERED)
>> + return;
>> +
>
> Is this check correct, or placed at the correct location? The reason I
> am asking is as follows. In rollback_registered_many(), dev->reg_state
> is set to NETREG_UNREGISTERING for devices that will be unregistered.
> When rtmsg_ifinfo_build_skb(RTM_DELLINK, ...) is called in the
> following loop in rollback_registered_many, this comparison will
> always be true and no DELLINK event generated.
>
> This change led to some applications I have not behaving as expected
> due to missing DELLINK when network devices are removed. I also see no
> DELLINK with ip mon link. Removing the check restores the old behavior
> (DELLINK events are generated). My machine is running 3.18.18, which
> includes this fix.
Ok, I see the problem. My patch depends on commit
395eea6ccf2b ("rtnetlink: delay RTM_DELLINK notification until after ndo_uninit()")
which has been introduced in 3.19 (this patch is not backported in 3.18).
After 3.19, rtmsg_ifinfo_build_skb() just builds a message (an skb), it never
calls rtmsg_ifinfo(). After this call, rollback_registered_many() calls
rtmsg_ifinfo_send() (which also never calls rtmsg_ifinfo()).
I will submit a patch for the 3.18.
Regards,
Nicolas
next prev parent reply other threads:[~2015-07-16 9:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-11 14:25 [PATCH net] rtnl: don't send rtnl msg for unregistered iface Nicolas Dichtel
2015-05-11 15:37 ` Jiri Pirko
2015-05-11 16:04 ` Nicolas Dichtel
2015-05-11 16:15 ` Nicolas Dichtel
2015-05-11 17:53 ` Jiri Pirko
2015-05-11 22:15 ` Andy Gospodarek
2015-05-12 8:43 ` Nicolas Dichtel
2015-05-12 15:03 ` [PATCH net v2] rtnl/bond: " Nicolas Dichtel
2015-05-12 15:06 ` Nicolas Dichtel
2015-05-12 15:17 ` [PATCH net v3] " Nicolas Dichtel
2015-05-12 15:58 ` Jiri Pirko
2015-05-12 16:10 ` Nicolas Dichtel
2015-05-12 16:14 ` Jiri Pirko
2015-05-13 12:19 ` [PATCH net v4] " Nicolas Dichtel
2015-05-13 12:24 ` Jiri Pirko
2015-05-13 12:36 ` Nicolas Dichtel
2015-05-18 2:44 ` David Miller
2015-07-13 14:11 ` Kristian Evensen
2015-07-15 15:07 ` Nicolas Dichtel
2015-07-16 9:06 ` Nicolas Dichtel [this message]
2015-07-16 9:31 ` [PATCH linux-3.18.y] rtnl: restore notifications for deleted interfaces Nicolas Dichtel
2015-05-12 17:12 ` [PATCH net v3] rtnl/bond: don't send rtnl msg for unregistered iface Andy Gospodarek
2015-05-13 12:01 ` Nicolas Dichtel
2015-05-13 14:43 ` Andy Gospodarek
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