Question & Answer
Question
Why do certain I/O adapters not recover automatically after a PCIe bus error?
Cause
Certain I/O adapters used will not recover automatically after certain types of PCIe bus communications errors. Some I/O adapters were not originally designed to take advantage of Enhanced Error Handling (EEH), while others have limitations that would require higher-level application intervention. Enhanced Error Handling was designed to work between the I/O adapter and the operating system device driver.
For these adapters, some form of manual or programmatic intervention must be used to recover the adapter. The type and scope of intervention depends upon the operating system and the function of the I/O adapter. The monitoring program must become aware of when the adapter becomes available again when using programmatic intervention. In certain cases, the adapter might not become available again without taking an action such as an IPL of the operating system, or a dummy repair of the I/O adapter.
For IBM i LAN adapters this recovery can be completed by a dummy repair of the adapter in System Service Tools.
For AIX LAN adapters, an IPL of the operating system or a dummy repair of the adapter must be performed to make it available again.
Answer
The following table contains a list of adapters known to have restrictions with automatic EEH recovery for certain PCIe bus communications errors.
|
Feature
|
CCIN
|
Description
|
| 5899 | 576F | PCIe2 4-port 1 GbE Adapter |
| 5767 | 5767 | 2-Port 10/100/1000 Base-TX Ethernet PCI Express |
| 9055 | 5767 | 2-Port 10/100/1000 Base-TX Ethernet PCI Express |
| 5281 | 5767 | PCIe LP 2-Port 1GbE TX adapter |
| 9056 | 5767 | PCIe LP 2-Port 1GbE TX adapter |
| EL2M | 5767 | 1Gb E'NET(UTP) 2-PORT, PCIE-4X/SHORT/LP |
| 5768 | 5768 | 2-Port Gigabit Ethernet-SX PCI Express adapter |
| 5274 | 5768 | PCIe LP 2-Port 1GbE SX adapter |
| 4764 | 4764 | PCI-X Cryptographic Coprocessor |
| 4765 | IBM PCIe Cryptographic Coprocessor (PCIeCC) Version 1 | |
| 4767 | PCIe Cryptographic Coprocessor (PCIeCC2) |
Additionally, IBM recognizes that an issue exists that may some times prevent recovery from starting on 10GB Ethernet I/O adapters native to IBM i, including SR-IOV configurations. This scenario is an architectural issue that will be addressed in the future. Virtual Ethernet I/O adapters are not affected by EEH recovery as no physical adapter exists for the virtual LAN configuration.
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Document Information
Modified date:
16 September 2022
UID
nas8N1022479