I am getting closer...
I added debugging, and noticed that it looks for:
snprintf(buf, sizeof(buf), "%s_qdisc_util", str);
However in q_xcp.c it had:
struct qdisc_util xcp_util = {
so I changed that to xcp_qdisc_util, and now i run tc:
lanthanum-ini tc # tc qdisc add dev ath0 root xcp capacity 54Mbit limit 100
Segmentation fault
This happens on this line:
q = dlsym(dlh, buf);
Since this is very hard for people to help me without the source code, i did
ask the author if it has been release publically and am waiting for a response.
In the meantime, it seems as though maybe instead of trying to get this to
work with a newer version of tc, i should install an old version of tc that the
module was original made for.
Though if anyone else has ideas let me know.
Thanks for all the help
- George
>> On Mon, 10 Apr 2006 21:41:39 -0400 (EDT) "George P Nychis"
>> <[EMAIL PROTECTED]> wrote:
>>
>>> Hi,
>>>
>>> I am trying to install a proprietary qdisc made for research, it is
>>> not publically released yet, however its been used several times so i
>>> know it works.
>>>
>>> The files included are: q_xcp.c: static int xcp_parse_opt() static
>>> int xcp_print_opt() static int xcp_print_xstats() struct qdisc_util
>>> xcp_util = { "NULL", "xcp" ..... };
>>>
>>> sch_xcp.c: static int xcp_enqueue() static int xcp_requeue() static
>>> struct sk_buff * xcp_dequeue() .... .... struct Qdisc_ops
>>> xcp_qdisc_ops ={ NULL,NULL,"xcp",.... };
>>>
>>> printk(KERN_INFO "XCP qdisc module loaded.\n"); return
>>> register_qdisc(&xcp_qdisc_ops);
>>>
>>>
>>> So, i make everything successfully, it creates q_xcp.so and copies it
>>> to /usr/lib and sch_xcp.o which it copies to /lib/modules/... so
>>> then I "insmod sch_xcp" and i see in dmesg: "XCP qdisc module loaded."
>>>
>>>
>>> I then try: "tc qdisc add dev eth0 root xcp capacity 10Mbit limit
>>> 500" and get: "Unknown qdisc "xcp", hence option "capacity" is
>>> unparsable"
>>>
>>> So then I read the INSTALL further to find some sort of solution and
>>> it mentions: This again assumes "tc" version is 2.4.7. If your "tc"
>>> is a different version, download the iproute2 source code, and edit
>>> Makefile to point "TC_INCLUDE" to "-I..../iproute2/include
>>> -I..../iproute2/tc"
>>>
>>> So, i did that, and i recompiled the q_xcp.so: lanthanum-ini
>>> src-1.0.1 # make q_xcp.so cc -O2 -fPIC
>>> -I/var/tmp/portage/iproute2-2.6.11.20050310-r1/work/iproute2-2.6.11/i
>>> nc lude/
>>> -I/var/tmp/portage/iproute2-2.6.11.20050310-r1/work/iproute2-2.6.11/t
>>> c_ include -o q_xcp.o -c q_xcp.c ld -shared -o q_xcp.so q_xcp.o rm -f
>>> q_xcp.o
>>>
>>> But i still get the same error.... so then my very final last effort
>>> was to move q_xcp.c to my iproute2 source code tc/ directory and
>>> added this to the makefile: TCMODULES += q_xcp.o
>>>
>>> Then I compiled tc, and i check tc to see if the xcp qdisc functions
>>> were loaded: lanthanum-ini tc # nm tc | grep xcp 080531ec t
>>> xcp_parse_opt 080533e0 t xcp_print_opt 08053426 t xcp_print_xstats
>>> 08070cc0 D xcp_util
>>>
>>>
>>> And finally: lanthanum-ini tc # ./tc qdisc add dev ath0 root xcp
>>> capacity 54Mbit limit 500 Unknown qdisc "xcp", hence option
>>> "capacity" is unparsable
>>>
>>>
>>> I have no clue :( I figured that putting the .so into /usr/lib would
>>> have been enough. Sorry for the long e-mail, I hope someone can
>>> help, and thank you for your time even if you don't know the solution
>>> but read this :)
>>>
>>> - George
>>>
>>
>> The .so needs to go in /usr/lib/tc (assuming you are running relatively
>> recent version of iproute2 tools).
>>
>> Read source to tc.c where it calls dlopen.
>>
>>
>
> Still didn't seem to solve the problem :\
>
> In my tc.c i have: snprintf(buf, sizeof(buf), "/usr/lib/tc/q_%s.so", str);
>
>
> Also: lanthanum-ini tc # ls /usr/lib/tc experimental.dist normal.dist
> pareto.dist paretonormal.dist q_netem.so q_xcp.so
>
> And finally: lanthanum-ini tc # tc qdisc add dev ath0 root xcp capacity
> 54Mbit limit 500 Unknown qdisc "xcp", hence option "capacity" is
> unparsable
>
> Maybe i should add debugging in tc.c and see if it sees the .so and fails
> to load it or something.
>
> Any other suggestions?
>
> Thanks for all the responses, George
>
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