RE: Standalone SRIO Driver for Linux

This should work. We use similar approach to test our mport HW drivers.

Alex.

From: Linuxppc-dev [mailto:linuxppc-dev-bounces+alexandre.bounine=idt.com@lists.ozlabs.org] On Behalf Of Saravanan S
Sent: Friday, July 13, 2012 2:16 AM
To: linuxppc-dev@lists.ozlabs.org
Subject: Standalone SRIO Driver for Linux

Hi ,
      Iam currently working on the GE make DSP230 board consisting of Quad PowerPC8640 nodes   interconnected by SRIO with Linux 2.6.34 . However the only way to access the SRIO is through rionet facility . Our requirement is to use the SRIO interconnect without the Ethernet overheads. This would definitely enable higher speeds (though I cant find any throughput figures for SRIO in Linux on the net ??? ).  My query is that whether any attempt has been made  to develop a  standalone driver and API to access the messaging  and doorbell services of SRIO . If no then request you to please provide inputs on the same. From my study I have the following thoughts for the driver :

a) Have a character device interface for user .
b) Basically use the rio support functions provided in rio.c like  rio_add_inb_buffer ,  rio_add_outb_message to transfer and receive messages and add buffers .
c) Maintain a dedicated ring of buffers in the driver and transfer  data to and from the buffer to user space .


Is this the right direction . Would really appreciate any inputs . thanks in advance.

Regards,

S.Saravanan