netdev - Re: [PATCH net-next v2] net-sysfs: expose number of carrier on/off changes

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Date:	Sun, 30 Mar 2014 08:18:13 -0700
From:	David Decotigny <decot@...glers.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Weilong Chen <chenweilong@...wei.com>,
	Jiri Pirko <jiri@...nulli.us>, Amir Vadai <amirv@...lanox.com>,
	Michael Dalton <mwdalton@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>, Tejun Heo <tj@...nel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next v2] net-sysfs: expose number of carrier on/off changes

Hi all,

As Eric mentioned, this is a per-link counter. I am not sure an
aggregate stat would be as useful.

As suggested by Florian, I'm planning to add a doc. As far as I can
tell, I think it goes beyond just documenting this new counter: I
believe sysfs-class-net needs to be added as a whole.

Stephen: I have a patch for iproute2, I was planning to send it after
we're done with this one, unless you want it now. Also, should I
document this IFLA thing, where would be best?

On Sat, Mar 29, 2014 at 6:50 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Sat, 2014-03-29 at 18:36 -0700, Stephen Hemminger wrote:
>> On Sat, 29 Mar 2014 09:48:35 -0700
>> David Decotigny <decot@...glers.com> wrote:
>>
>> > This allows to monitor carrier on/off transitions and detect link
>> > flapping issues:
>> >  - new /sys/class/net/X/carrier_changes
>> >  - new rtnetlink IFLA_CARRIER_CHANGES (getlink)
>> >
>> > Tested:
>> >   - grep . /sys/class/net/*/carrier_changes
>> >     + ip link set dev X down/up
>> >     + plug/unplug cable
>> >   - updated iproute2: prints IFLA_CARRIER_CHANGES
>> >   - iproute2 20121211-2 (debian): unchanged behavior
>> >
>> > Signed-off-by: David Decotigny <decot@...glers.com>
>>
>> Is there a related SNMP MIB variable? should there be?
>
> I don't think we have any SNMP MIB variable for devices ?
>
> It seems "ip link" is the facto standard.
>
> (BTW we put BusyPollRxPackets in TcpExt group, this was an error IMHO)
>
>
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