From zhangwqh at 126.com  Wed Jan 15 17:29:04 2014
From: zhangwqh at 126.com (=?GBK?B?1cXOsA==?=)
Date: Wed, 15 Jan 2014 22:29:04 -0000
Subject: [Click] When run_task function starts to run in element
Message-ID: <56caf33.197cf.14398057ef6.Coremail.zhangwqh@126.com>

Hi all, 


I starts to learn click router recently. I have a question that make me confused. Does anybody give me some advices. I will be appreciated. 
In each element, there is a function named run_task. I can not understand when this run_task function will be executed. 
If my following understanding is not correct, please help to point them out.
From the document, it seems that there is a kernel thread. Whether this thread will manage a queue, in this queue, the tasks in this queue are the run_tasks tasks. When I learn the code, I want to find where the run_task function will be called, however I can not find the places. There are many places that call the function _task.fast_reschedule(). What is the function and aim for this function _task.fast_reschedule()? Whether does it have some relation with the task queue?  Where is the code for task scheduling? I do not know where they are.


I am looking forward to anybody's reply.



From wrightsophia119 at gmail.com  Thu Jan 30 14:35:17 2014
From: wrightsophia119 at gmail.com (sophia wright)
Date: Thu, 30 Jan 2014 19:35:17 -0000
Subject: [Click] ToHost: dropped a packet with null skb->dev
Message-ID: <CAFb6iCbp8euGokPMgRSB3L3QqsbuctcasZd7giCJe5iAXbWZcw@mail.gmail.com>

Hello,

i want to create a number of TCP reset packets.
To create my new RST packet  i use the code that is in tcpipsend.cc  file.
the path: /click/elements/tcpudp/tcpipsend.cc

the RST packets are created normaly, but when i forward it on  the router
path
then i have the message : ToHost: dropped a packet with null skb->dev

also the packet doesn't appear on the wireshark.

Any idea , or some hints , why my packet that i create is dropped???

  thank you in advance

From Steven.Berson at aero.org  Fri Jan 31 18:24:15 2014
From: Steven.Berson at aero.org (Steven Berson)
Date: Fri, 31 Jan 2014 23:24:15 -0000
Subject: [Click] click linux module problems with linuxmodule tests
Message-ID: <52EC3086.8040002@aero.org>

I am trying to install click on an Ubuntu12-64-LTS Emulab image running 
a 3.2.0-56-generic kernel.  It should be stock or pretty close to stock.

root at nm-3:~# uname -a
Linux nm-3.v1.wgs.sntb.aero.org 3.2.0-56-generic #86-Ubuntu SMP Wed Oct 
23 09:20:45 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
root at nm-3:~#

I built and installed the click linuxmodule, then I tried the tests.  
The following tests ran without a hitch (all successes, no failures, and 
no skipped) - compound, ethernet, handlers, ip, standard, tcpudp, 
tools.  But it has failures in several of the other packages.  In 
particular, it seems to have a lot of problems in linuxmodule.  If I do 
the linux module tests individually, ToHost-01, ToHost-02, and 
clickfs-01 all work, then there was an error in ToHost-udpsocket-01, 
then deviceup-01 hangs (or sometimes wedges the OS).  Am I doing 
something wrong?  I have been having similar issues with Ubuntu10_LTS, 
and Centos55.

Thanks,
Steve

root at wgs:~/CLICK/click.ubuntu-12-64-LTS/test# ./testie analysis/
analysis/FromIPSummaryDump-ipopt-01.testie:18: failure at '# use tcpdump 
to verify dump^Jtcpdump -n...'
analysis/FromIPSummaryDump-ipopt-01.testie:18:   tcpdump: OUT1: 
Permission denied
testie: 9 successes, 1 failure, 2 skipped
oot at wgs:~/CLICK/click.ubuntu-12-64-LTS/test# ./testie icmp/
icmp/ICMPPingEncap-01.testie:13: failure at 'tcpdump -n -r FOO > CHECK'
icmp/ICMPPingEncap-01.testie:13:   tcpdump: FOO: Permission denied
testie: 5 successes, 1 failure, 0 skipped
root at wgs:~/CLICK/click.ubuntu-12-64-LTS/test# ./testie IPRewriter/
IPRewriter/FTPPortMapper-01.testie:57: file NETCAT2 has unexpected value 
starting at line 2
IPRewriter/FTPPortMapper-01.testie:57: NETCAT2:2: expected 'money'
IPRewriter/FTPPortMapper-01.testie:57: NETCAT2:2: but got  '<end of file>'
IPRewriter/IPRewriter-10.testie:88: file RM has unexpected value 
starting at line 1
IPRewriter/IPRewriter-10.testie:88: RM:1: expected '1.0.0.2 1024 
2.115.2.2 2'
IPRewriter/IPRewriter-10.testie:88: RM:1: but got  '<end of file>'
testie: 29 successes, 2 failures, 0 skipped
root at wgs:~/CLICK/click.ubuntu-12-64-LTS/test# ./testie -V threads/
threads/StaticThreadSched-01.testie: Running...
threads/StaticThreadSched-01.testie:5: requirement failure at 
'click-buildtool provides umultithread'
testie: 0 successes, 0 failures, 1 skipped
oot at wgs:~/CLICK/click.ubuntu-12-64-LTS/test# ./testie userlevel/
userlevel/timewarp-01.testie:30: standard output has unexpected value 
starting at line 2
userlevel/timewarp-01.testie:30: stdout:2: expected 
'.{{(48|49|50|51|52).*}}'
userlevel/timewarp-01.testie:30: stdout:2: but got  '.545928879'
testie: requirement failures blocked 2 tests, use '-V' for details
testie: (commands 'click-buildtool provides umultithread', 'false')
testie: 9 successes, 1 failure, 2 skipped

root at nm-3:~/CLICK/click.ubuntu-12-64-LTS/test/linuxmodule# testie 
ToHost-01.testie
testie: 1 success, 0 failures, 0 skipped
root at nm-3:~/CLICK/click.ubuntu-12-64-LTS/test/linuxmodule# testie 
ToHost-02.testie
testie: 1 success, 0 failures, 0 skipped
root at nm-3:~/CLICK/click.ubuntu-12-64-LTS/test/linuxmodule# testie 
clickfs-01.testie
testie: 1 success, 0 failures, 0 skipped
root at nm-3:~/CLICK/click.ubuntu-12-64-LTS/test/linuxmodule# testie 
ToHost-udpsocket-01.testie
ToHost-udpsocket-01.testie:14: failure at 'kill $ncproc'
ToHost-udpsocket-01.testie:14:   ./%script: 22: kill: No such process
testie: 0 successes, 1 failure, 0 skipped
root at nm-3:~/CLICK/click.ubuntu-12-64-LTS/test/linuxmodule# testie 
deviceup-01.testie
     <hangs or wedges the system>