[ixp1200] Receiving Data from a particular port on IXP2400

[Sanjay Kumar]

Hi Folks,
I am writing a microengine rx/tx driver for ixp2400. for the receive side, 
i want to allocate a particular thread for particular MAC port. I want 
that, when I enqueue this thread into RX_THREAD_FREELIST, the thread 
should be able to specify in which port's mpacket data it is interested 
in,  and the MSF should send a signal to the thread only when an mpacket 
 from that particular port arrives.

However, I have not been able to find out any way in which the thread can 
specify in which port's mpakcet it is interested. (i.e. the equivalent of 
3 LSB bits of Receive Request (RCV_REQ) Register in IXP1200 IX bus 
interface).
Is it possible to do that? If someone knows the answer, please let me know.

All I could find out was that MSF's receive status word (RSW) contains a 
field which tells which physical port this mpacket came from (e.g. in 
POS-PHY Level 3, 32 bit MPHY mode, the 5 LSB bits of RSW0 will tell this 
information). and then it is the thread's job to read this field and sort 
out different mpackets received from different ports. This will make the 
driver pretty messy especially if you are employing multiple threads to 
receive mpackets from a particular port.

Thanks in advance for any input.
Sanjay

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http://www.cc.gatech.edu/~ksanjay