[ofa-general] how to write a IB user level multicast application

[Dotan Barak]

Andrew Friedley wrote:
> Dotan Barak wrote:
>> In the following URL you can find a very simple example on how to use 
>> multicast:
>> https://svn.openfabrics.org/svn/openib/trunk/contrib/mellanox/ibtp/gen2/userspace/useraccess/multicast_test/multicast_test.c 
>
>
> I seem to be missing v1.h on my OFED v1.2 nightly install, where can I 
> find it?
VL can be found in:
https://svn.openfabrics.org/svn/openib/trunk/contrib/mellanox/ibtp/common/tools/vl/
>
>> this test doesn't send an SA query (to get the multicast props) or an 
>> SA multicast join (to make the SM configure the subnet to make the 
>> port that this QP is attached to) to get the multicast messages.
>>
>> This example will work on a back-to-back topology.
>
> An alternative that I've had pretty good success with is to use the 
> RDMA CM.  It uses an IP(v6) abstraction, does the SA queries/joins for 
> you, and also supports selection of an unused multicast address if you 
> join the '0' address (and port? not sure if its required, I always 
> zero it).  Check out the 'mckey.c' example included with the RDMA CM 
> source, it will likely answer your questions.
This test was written in order to check the verbs layer without any 
dependency on any ULP.

thanks
Dotan