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PWilc1
New Contributor I
1,473 Views

82599 gets link up, but won't receive data

We are using an 82599 part with a Haswell processor. We are using

the part in 10G XAUI mode connected to a Marvell switch. The part

sends data to the switch and reports link up. However, the part never

receives any data or gets any errors. Counters in the Marvell

switch show that data is being sent to the 82599. Getting linkup

implies to me that the 82599 is recognizing the idle pattern sent by

the Marvell switch. So why does it not receive data? With other

devices, we have found that a poorly performing link can result

in getting link up, but errors occur with data transfers, but here

we get no errors and no data. The connections between the

Marvell switch and the 82599 are less than 2 inches long and

are 100 Ohm differential pairs. We have other, longer connections

to different ports on the Marvell switch operating in XAUI mode

to other devices. We have used this same port on the Marvell

switch in XAUI mode on other designs, so we know the port on

the switch is correctly set up for XAUI operation.

Thanks, Paul.

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5 Replies
CarlosAM_INTEL
Moderator
91 Views

Hello PVWB ,

Thank you for contacting the Intel Embedded Community.

We suggest you review that your implementation is unaffected by the erratum 55. This information can be found on pages 48 and 49 of the http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/82599-10-gbe-contr... Intel(R) 82599 10 GbE Controller Specification Update.

Also, please review the information of the Specification Clarifications section, specifically the seventh point on page 17 of the listed Specification Update.

We hope that this information may help you.

Best Regards,

Carlos_A .

PWilc1
New Contributor I
91 Views

Dear Carlos,

We used the 4.25 XAUI EEPROM image as our starting point. The specification update

says "This issue is resolved by the 82599 EEPROM Dev Starter rev 4.22 or newer", so

we should be O.K. in this respect.

Thanks, Paul.

PWilc1
New Contributor I
91 Views

Dear Carlos,

We didn't see increments in the ILLERRC or ERRBC registers either,

we just saw transmission counts increase.

Is it possible that the EEPROM files turn on Rx lane swapping or

polarity swapping? It's wierd that we get link up but no data or errors

at all. The differential traces are only about 2" (50mm) long. We

have had XAUI work with other parts over much longer distances than this.

Thanks, Paul.

PWilc1
New Contributor I
91 Views

We found we had the polarity swapped on one of the lanes by

mistake. This can be corrected by setting a bit in the Marvell switch.

We now get data transfer in both directions. Marvell told us the

either polarity swaps or lane swaps result in this symptom of

link-up but no data transfers occur.

Thanks, Paul.

CarlosAM_INTEL
Moderator
91 Views

Hello PVWB ,

Thanks for your updates.

We are glad to hear that your problem has been solved.

Please do not hesitate to contact us again if you have more problems related to Intel Embedded devices.

Best Regards,

Carlos_A.

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