Okay, I understand the mechanism behind the huge exp_time value.
It's in the net/mac80211/net/cfg.c:mpath_set_pinfo().
If the given mpath is expired, the pinfo->exptime is never set,
e.g: assignment to pinfo->exptime is only done when the mpath is
not expired:
if (time_before(jiffies, mpath->exp_time))
pinfo->exptime = jiffies_to_msecs(mpath->exp_time - jiffies);
And I guess the pinfo points to some local storage in the caller's stack,
giving exptime a random and/or pointer like value.
Initializing the *pinfo to zeros will fixed this problem, unless
the huge value has something to tell for the users of iw mpath dump.
--- shinoda
On 2012/08/20, at 0:19, Yeoh Chun-Yeow wrote:
> The mpath that is expired and waits for deletion seems to have the
> high value consistent for a while, such as 3242852032 in my case.
>
> DEST ADDR NEXT HOP IFACE SN METRIC QLEN
> EXPTIME DTIM DRET FLAGS
> 0a:0b:6b:b6:5c:1e 0a:0b:6b:b6:5c:1e mesh0 236 71 0
> 3242852032 0 0 0x14
> 00:15:6d:b0:e6:b7 00:15:6d:b0:e6:b7 mesh0 0 79 0
> 3242852032 0 0 0x10
> 0a:15:6d:b0:e7:07 00:15:6d:b0:e6:b7 mesh0 7465 150 0
> 3242852032 0 0 0x14
> 0a:0b:6b:b6:5b:11 0a:0b:6b:b6:5b:11 mesh0 4252 64 0
> 3242852032 0 0 0x14
>
> Whenever the mpath is expired, pinfo->exptime is not update due to if
> condition.
>
> --
> Chun-Yeow
>
> On Sun, Aug 19, 2012 at 5:01 PM, LEO Airwarosu Yoichi Shinoda
> <[email protected]> wrote:
>>
>> I noticed that net/mac80211/cfg.c translates the values
>> to msecs in mpath_set_pinfo().
>>
>> But my last question is still valid:
>>> So, if 1 jiffie = 1 msec in my system, 2176653824 is 25 days.
>>> Is this correct?
>>
>> I have another question, which is:
>>
>> Why huge timer values do not down count, as opposed to
>> small values (usually less than 5000), which look rapidly
>> down count and reset to 5000.
>>
>> --- shinoda
>>
>> On 2012/08/19, at 17:50, LEO Airwarosu Yoichi Shinoda wrote:
>>
>>>
>>> Chun-Yeow,
>>>
>>> Oh, I see that the example in the explanation page also list
>>> huge values.
>>>
>>> So, if 1 jiffie = 1 msec in my system, 2176653824 is 25 days.
>>> Is this correct?
>>>
>>> --- shinoda
>>>
>>> On 2012/08/19, at 13:34, Yeoh Chun-Yeow wrote:
>>>
>>>> You can refer here for the explanation.
>>>> https://github.com/cozybit/open80211s/wiki/mpath
>>>>
>>>> Time when this Mesh Path will expire, in jiffies.
>>>>
>>>> --
>>>> Chun-Yeow
>>>>
>>>> On Sat, Aug 18, 2012 at 2:29 AM, LEO Airwarosu Yoichi Shinoda
>>>> <[email protected]> wrote:
>>>>> Hi.
>>>>>
>>>>> I have been observing huge EXPTIME in iw mpath dump outputs.
>>>>> They do not change over time.
>>>>> Any idea what they are?
>>>>>
>>>>> Here are three examples from 3 different mp (or mpp)s.
>>>>>
>>>>> root@gn4:~# iw wlan0 mpath dump
>>>>> DEST ADDR NEXT HOP IFACE SN METRIC QLEN
>>>>> EXPTIMEDTIM DRET FLAGS
>>>>> 4e:e6:76:a9:5b:9e 4c:e6:76:aa:51:a8 wlan0 2095 16386 0
>>>>> 2176653824 0 0 0x14
>>>>> 00:01:8e:10:bc:79 00:01:8e:10:bc:79 wlan0 13727 8513 0
>>>>> 4430 200 1 0x15
>>>>> … rest of the line truncated
>>>>>
>>>>> root@wlae1:~# iw wlan0 mpath dump
>>>>> DEST ADDR NEXT HOP IFACE SN METRIC QLEN
>>>>> EXPTIMEDTIM DRET FLAGS
>>>>> 4c:e6:76:44:9b:04 4c:e6:76:aa:51:a8 wlan0 120807 16386 0
>>>>> 2180848128 0 0 0x14
>>>>> 4c:e6:76:44:9a:e8 4c:e6:76:44:9a:e8 wlan0 2601 8193 0
>>>>> 3180 0x15
>>>>> … rest of the line truncated
>>>>>
>>>>> root@gn1:~# iw wlan0 mpath dump
>>>>> DEST ADDR NEXT HOP IFACE SN METRIC QLEN
>>>>> EXPTIMEDTIM DRET FLAGS
>>>>> 4c:e6:76:44:9a:d5 4c:e6:76:97:d7:01 wlan0 20353 24579 0
>>>>> 2176653824 0 0 0x14
>>>>> 4c:e6:76:aa:51:a8 4c:e6:76:aa:51:a8 wlan0 0 15649 0
>>>>> 2176653824 0 0 0x10
>>>>> 4c:e6:76:97:d7:01 4c:e6:76:97:d7:01 wlan0 1834 8193 0
>>>>> 4280 0x15
>>>>> … rest of the line truncated
>>>>>
>>>>>
>>>>> --- shinoda
>>>>>
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