82598EB Datasheet, PDF (67/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - PCIe
3.1.1.9 Error Forwarding
If a TLP is received with an error-forwarding trailer, the packet is dropped and is not delivered to its
destination. The 82598 does not initiate additional master requests for that PCI function until it detects
an internal software reset for associated LAN port. Software is able to access device registers after such
a fault.
System logic is expected to trigger a system-level interrupt to inform the operating system of the
problem. Operating systems can then stop the process associated with the transaction, re-allocate
memory instead of the faulty area, etc.
3.1.1.10 Link Layer
3.1.1.10.1 ACK/NAK Scheme
The 82598 supports two alternative schemes for ACK/NAK rate:
1. ACK/NAK is scheduled for transmission following any TLP.
2. ACK/NAK is scheduled for transmission according to timeouts specified in the PCIe v2.0 (2.5 GT/s)
specification.
The PCIe Error Recovery bit (loaded from the EEPROM) determines which of the two schemes is used.
3.1.1.10.2 Supported DLLPs
The following DLLPs are supported by the 82598 as a receiver:
1. ACK
2. NAK
3. PM_Request_Ack
4. InitFC1-P
5. InitFC1-NP
6. InitFC1-Cpl
7. InitFC2-P
8. InitFC2-NP
9. InitFC2-Cpl
10. UpdateFC-P
11. UpdateFC-NP
12. UpdateFC-Cpl
The following DLLPs are supported by the 82598 as a transmitter:
1. ACK
2. NAK
3. PM_Enter_L1
4. PM_Enter_L23
5. InitFC1-P
6. InitFC1-NP
7. InitFC1-Cpl
67