82598EB Datasheet, PDF (330/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - Register Descriptions
SIZE
Reserved
19:10
31:20
0x200/0
Receive Packet buffer size
Default values:
0x200 (512 kB) for RXPBSIZE0.
0x0 (0 kB) for RXPBSIZE1-7.
Other than the default configuration of one packet buffer, the 82598 supports
two more configurations:
Partitioned receive equal:
0x40 (64 kB) for RXPBSIZE0-7.
Partitioned receive not equal:
0x50 (80 kB) for RXPBSIZE0-3.
0x30 (48 kB) for RXPBSIZE4-7.
0x0
Reserved
4.4.3.5.11 Receive Control Register – RXCTRL (0x03000; RW)
Field
RXEN
DMBYPS
Reserved
Bit(s)
Initial
Value
0
0b
1
1b
31:2
0x0
Description
Receive Enable
When set to 0b, filter inputs to the packet buffer are ignored.
Descriptor Monitor Bypass
When set to 1b, the descriptor monitor (checking if there are enough descriptors
in the target queue) is disabled.
Reserved
4.4.3.5.12 Drop Enable Control – DROPEN (0x03D04 – 0x03D08; RW)
Field
Drop_En
Bit(s)
Initial
Value
31:0
0x0
Description
Drop Enabled
If set to 1b, packets received to the queue when no descriptors are available to
store them are dropped.
If set to 0b, packets received to the queue when no descriptors are available to
store are held in an internal buffer until descriptors are available again.
Each bit represents the appropriate queue (bit 0 in DROPEN0 represents
queue0; bit 31 in DROPEN1 represents queue 63).
When RXCTRL.DMBYPS is set to 1b, only packets received to a disabled queue
are dropped.”
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