[ofa-general] entry points in OFED kernel module

[Tziporet Koren]

sumeet gandhare wrote:
> Hi,
> I am new to OFED stack and wish to understand the design from the 
> source code. I have read the chapter 3 of IBA spec from OpenFabrics 
> and understand the concept of Queue Pair, Completion Queue, work 
> request, consumer, LID, GUID. Basically in IB, the consumer process 
> enqueues the work request to the send queue pair which specifies the 
> virtual address of the message to be sent and destination LID and QPN. 
> The receiving consumer enqueues work elements to receive queue 
> specifying the virtual address of the message being received. On 
> arrival of the message , the completion queue contains a CQE 
> notification to the client. So hardware basically is a DMA engine 
> which transfer the message from source virtual address to desitnation 
> virtual address. I wish to understand how this part better.
>
> Please could you suggest entry points in the stack like verbs and the 
> interaction with device driver like iPath and Mlx.. What all files I 
> should look at and in what sequence to better understand the 
> programming model and its implementation to send and receive the IB 
> packets on the wire?
I suggest you look at examples under libibverbs directory, for writing 
verbs applications
As for the drivers they are located under drivers/infiniband/hw/

Tziporet