[openib-general] mad_agents

[Michael Arndt]

Hi,

the following statements about functions and modules refer to the mad.c, 
agent.c and user_mad.c file.

during the initialisation of the mad module a funktion ib_agent_port_open is 
called(ib_mad_init_device -> ib_mad_port_open). At this point an agent is 
registered (ib_register_mad_agent), without a MAD registration request 
applied. So my question is, what is this agent for?

And is it right that the agent registered by the umad module 
(ib_umad_ioctl -> ib_umad_reg_agent -> ib_register_mad_agent) gets all the 
SMP packets from the device and passes them to the SM (read and 
FileDescriptior).

What is about the SMA? Where are the SMPs filtered between SMA and SM?

I also would like to say that it would be really nice if there would be some 
papers, diagrams, grafics or anything else which explain how the whole 
openib system works. The source code as only reference isn't really helping 
for new developer.

Thanks Michael