[ixp1200] Receive error from giga port

[Wong Kim Sing]

Hi,

My work is on IXP1240.

Which code are you trying, is it "L3Fw8_1f.ue"?

For my case, I try to aggregate packet from FE port to GE port, and I have modified the reciving part of the FE code to transmit packet to GE port. Recently, I got a email regarding this problem, and it he said that it is due to the coordination issue in the TFIFO. Do you have any ideal on this issue?

As what I suspect, it may be cause by the HW at the TFIFO. Hope we can help each other in solving this problem.

Mike Wong Kim Sing
R&D Engineer
Institute for  Communications Research
20 Science Park Road
TeleTech Park
#02-34/37
Singapore Science Park II
Singapore 117674
Tel: 65 68729030  DID : 65 68709320
Fax: 65 67795441
Email: wongks at icr.a-star.edu.sg
Website: http://www.icr.a-star.edu.sg

>>> haritak at ics.forth.gr 06/23/03 08:00 AM >>>

I am facing exactly the same problem and I haven't found a solution yet.

I am working on ENP-2506.

In my case the problem is :

I move some data to SDRAM (one packet) and then I transmit it several
times.

What I observe is that some replicas of the packet are xmited fine,
while sometimes bits are missing resulting in a smaller packet.

The "phenomenon" seems quite periodic:
4 packets received fine, one packet reduced by 63Bytes,
4 packets received fine, one packet reduced by 103Bytes,
4 packets received fine, one packet reduced by 63Bytes,
...

The bigger the packet (>15 MPKTs) the more frequent the errors.
Smaller packets seem to be fine, however for 8MPKTS still I received
one erroneous after some transmissions.

I suspect there might be a chance of overflowding the xmit buffer on the
port. However, the problem persisted even when the microCode was
programmed to xmit only one packet and I was uploading it many times
manually in order to produce replicas of the packet.

But I am still working on that. So any (debugging) ideas are
welcome.


Thanks a lot for your time!
Yannis Haritakis



On Tue, 27 May 2003, Wong Kim Sing wrote:

> Hi,
>
> I had this problem of receiving error packet from the giga port, here is how the test go.
>
> I had created some packets in the microengine, e.g.
>
> move($$dxfer0, 0xfffffff1)
> move($$dxfer1, 0xfffffff3)
> move($$dxfer2, 0xfffffff5)
> move($$dxfer3, 0xfffffff7)
> move($$dxfer4, 0xfffffff9)
> move($$dxfer5, 0xfffffffb)
> move($$dxfer6, 0xfffffffd)
> move($$dxfer7, 0xffffffff)
>
> sdram[write, $$dxfer0, packet_buf_addr, 0, 4], ctx_swap
>
> move($$dxfer0, 0xfffffff1)
> move($$dxfer1, 0xfffffff3)
> move($$dxfer2, 0xfffffff5)
> move($$dxfer3, 0xfffffff7)
> move($$dxfer4, 0xfffffff9)
> move($$dxfer5, 0xfffffffb)
> move($$dxfer6, 0xfffffffd)
> move($$dxfer7, 0xffffffff)
>
> sdram[write, $$dxfer0, packet_buf_addr, 4, 4], ctx_swap
>
> And I send out this packet to the giga port using the "L3fw8_1.uc" microcode from intel reference design.
>
> Result obtained as below:
>
> 19:21:03.445227 ff:f0:ff:ff:ff:f1 ff:ff:ff:f1:ff:ff ffff 116:
>
> fff2 ffff fff5 ffff fff4 ffff fff5 ffff
> fff6 ffff fff9 ffff fff8 ffff fff9 ffff
> fffa ffff fffd ffff fffc ffff fffd ffff
> fffe ffff fff1 ffff fff0 ffff fff1 ffff
> fff2 ffff fff5 ffff fff4 ffff fff5 ffff
> fff6
>
> On the first row and the fifth row, it should be "fff3" and "fff5" respectively, but it become "fff2" and "fff4", there is one bit being modified.
>
> And also from 2nd row onward,there is some duplication occur, the 2 words "ffff fff5" has been repeated two time in row 4 and row 6.
>
> Is there anyone has this similar problem before or do you have any ideal of solving this, please send a email, thank you.
>
> Mike Wong Kim Sing
> R&D Engineer
> Institute for  Communications Research
> 20 Science Park Road
> TeleTech Park
> #02-34/37
> Singapore Science Park II
> Singapore 117674
> Tel: 65 68729030  DID : 65 68709320
> Fax: 65 67795441
> Email: wongks at i2r.a-star.edu.sg
> Website: http://www.i2r.a-star.edu.sg
>
>