[Coral-dev] Coral with DAG

[Ken Keys]

We are maintaining CoralReef, but I'm afraid we haven't kept up with
changes in DAG, as we don't have any of the newer DAG cards.  If you
send your patch to coral-info at caida.org, I'll see about integrating
it into a release.

-- 
Ken Keys
kkeys at caida.org

On Mon, Nov 07, 2011 at 10:55:09PM -0500, Srinivas Krishnan wrote:
> 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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