Intel RS3SC008 Datasheet download pdf (Page 38)

Intel

82599 10 GbE Controller—Errata

37 PCIe: PM_Active_State_NAK Message Might Be

Ignored

Problem:

A PM_Active_State_NAK message received by the 82599 might be ignored under the following

conditions:

• The 82599 configuration for ASPM L1 is enabled, and L0s is disabled. Note that this configuration is

possible only if an upstream device also supports ASPM L1.

• The 82599 initiates APSM L1 transition by sending PM_Request_L1 DLLPs upstream.

• Upstream device tries to terminate ASPM L1 transition by sending a single PM_Active_State_NAK

message.

After ignoring the PM_Active_State_NAK message, the 82599 continues the ASPM L1 transition by

sending PM_Request_L1 DLLPs endlessly.

Implication:

Device hang, which eventually could lead to a system hang.

Workaround:

To avoid the erratum condition do one of the following:

• Disable ASPM L1 in the 82599 EEPROM image (default).

• Enable both ASPM L1 and L0s in the 82599 configuration space.

• Verify that the upstream device never sends PM_Active_State_NAK when configured to support

ASPM L1.

Status: B0=Yes; NoFix

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Intel RS3SC008 Datasheet Page 38