[ixp1200] Inter-ME uCode communication

[Shyamal Pandya]

I wrote my own MESource macro and I assigned ME-to-ME queues separately. 
This has to be done carefully so as not to clash with the queues assigned by 
the resource manager, otherwise you will end up clobbering the queues 
already set up. I look at the resource manager source code will reveal the 
queues that are assigned, so that you can determine your own queues. As 
Abhijeet said, these are hard-coded.

Also if you look at the MESink macro, you will realize that the queues in 
which the packets go depend on the output port, so if you want to put your 
packets in a different queue you will have to write a different sink macro, 
or  you will have to manilpulate the output port register in the sending 
thread.


--
Shyamal Pandya

Arizona State University

Addr:
920 S Terrace Rd #102
Tempe AZ 85281
Phone:
1-480-966-1982





>From: Cyrus Hall <hallcp at cs.colorado.edu>
>Reply-To: ixp1200 at CS.Princeton.EDU
>To: ixp1200 List <ixp1200 at CS.Princeton.EDU>
>Subject: [ixp1200] Inter-ME uCode communication
>Date: 21 Jul 2003 17:03:09 -0600
>
>I've finally gotten to the point in my code where I need to expand to
>multiple microengines.  I think I've figured out what changes are needed
>in ixconfig, but other things are now vexing me.
>
>In the count example, the dispatch loop either forwards a packet with
>DL_SASink[] or DL_MESink[].  From the documentation, it sounds like
>DL_MESink[] passes the current packet reference to the next control
>block (next microengine).  Just like DL_SASink[] has a inverse
>(DL_SASource[]), I would expect the the ME version to have one,
>something like DL_MESource[], yet no such macro exists.
>
>So what do must of you do?  Have you just written a DL_MESource, or do
>you use one of the many other ways to syncronize between engines (SRAM
>CAM locks, or some other test-set mechanism)?  I'm wondering which is
>the best way to go from here.
>
>Thanks,
>Cy
>

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