[Coral-dev] Coral with DAG

[Srinivas Krishnan]

I ended up coding the functionality using the DAG API. Digging deeper coral
uses ioctl's to access information on the card and the new DAGs dont use
the same ioctls anymore.

I patched coral to use the DAG API that should be more stable over time. Is
Coral actively being maintained, and is there a way for the patch to make
it into the repo ?

-srinivas



On Mon, Nov 7, 2011 at 10:26 PM, Stephen Donnelly <
Stephen.Donnelly at endace.com> wrote:

>  I am not sure if the Coralreef developers are still maintaining the
> native DAG interface, possibly a bug has crept in.****
>
> ** **
>
> As a work-around you might try using the libpcap interface in Coral
> instead. Download and compile libpcap from tcpdump.org; it should
> automatically detect and include DAG support if it is installed. Then build
> Coral with libpcap support, making sure it is finding and linking against
> your new libpcap version. You may need to modify LD_LIBRARY_PATH or remove
> the distribution libpcap version.****
>
> ** **
>
> You can then capture from the libpcap ‘dag0’ interface in Coral (and other
> tools) instead of using the DAG native support. You will lose some time
> stamp resolution and the interface information with this method but it may
> be more robust.****
>
> ** **
>
> Regards,****
>
> Stephen.****
>
> ** **
>
> *From:* coral-dev-bounces at caida.org [mailto:coral-dev-bounces at caida.org] *On
> Behalf Of *Srinivas Krishnan
> *Sent:* Sunday, 6 November 2011 4:37 p.m.
> *To:* coral-dev at caida.org
> *Subject:* [Coral-dev] Coral with DAG****
>
> ** **
>
> We are trying to use Coral with our 10G DAG and compiled coral with DAG
> support. However, every time we try to use a utility it segfaults. Here is
> a sample:****
>
> ** **
>
>  crl_rate -Cproto=ETHER /dev/dag0****
>
> ** **
>
> Also a short trace of where it fails:****
>
> ** **
>
> Program received signal SIGSEGV, Segmentation fault.****
>
> coral_dag_init (src=0x6420d0) at coral_type_dag.c:158****
>
> 158             coral_cell_field_offset(iface0, PAYLOAD) = 18;****
>
> (gdb) bt****
>
> #0  coral_dag_init (src=0x6420d0) at coral_type_dag.c:158****
>
> #1  0x0000000000407638 in coral_open (src=0x6420d0) at coral_init.c:760***
> *
>
> #2  0x0000000000403d99 in src_info (src=0x0) at crl_info.c:227****
>
> #3  0x0000000000404908 in main (argc=3, argv=0x7fffffffe738) at
> crl_info.c:352****
>
> ** **
>
> Any suggestions on how to get around it ?****
>
>
> -srinivas****
>
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