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Immediate Interrupt Rx - IMIR (05A80h + 4*n [n = 0..7]; R/W) — Intel
®
82575EB Gigabit
Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 349
14.3.46 Immediate Interrupt Rx - IMIR (05A80h + 4*n
[n = 0..7]; R/W)
This register defines the filtering that corrects which packet triggers dynamic interrupt moderation.
Another register includes a size threshold and a control bits bitmap to trigger an immediate interrupt.
Note: The Port field should be written in network order.
Note: If PORT_IM_EN is set for a given filter, then at least one of the PORT_BP, Size_BP, and
CtrlBit_BP bits should be cleared.
Field Bit(s)
Initial
Value
Description
Reserved 1:0 00b Reserved
Interval 14:2 0h Minimum inter-interrupt interval. The interval is specified in 256 ns increments. A zero
disables interrupt throttling logic.
Reserved 15 0b Reserved
Counter (RWS) 31:16 0h Down Counter
Loaded with the interval value each time the associated interrupt is signaled. Counts
down to 0 and stops. The associated interrupt is signaled each time this counter is zero
and an associated (via the Interrupt Select register) EICR bit is set.
This counter can be directly written by software at any time to alter the throttle’s
performance.
Field Bit(s)
Initial
Value
Description
PORT 15:0 X Destination TCP Port
This field is compared with the destination TCP port in incoming packets.
PORT_IM_EN 16 0b Destination TCP Port Enable
Allows issuing an immediate interrupt if the following three conditions are met:
Packet TCP destination port is equal to Port field.
Packet length of incoming packet is smaller than Size_Thresh in the IMIREX register.
At least one of the TCP control bits of incoming packets is set and the corresponding bit
in CtrlBit field in the Im_Int_Rx_Ext register is set.
PORT_BP 17 X Port Bypass
When set to 1b, the TCP port check is bypassed and only other conditions are checked.
When set to 0b, the TCP port is checked to fit the port field.
Reserved 31:18 0h Reserved