82598EB Datasheet, PDF (218/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - Receive Functionality
Figure 3-22. VLAN Filtering
3.5.2.2
Intel® 82598 10 GbE Controller System Manageability Interface application
noteReceive Data Storage
The descriptor points to a memory buffer to store packet data.
The size of the buffer is set using the per queue SRRCTL[n].BSIZEPACKET field.
Receive buffer size selected by bit settings SRRCTL[n].BSIZEPACKET support buffer sizes of 1 kB
granularity.
In addition, for advanced descriptor usage the SRRCTL.BSIZEHEADER field is used to define the size of
the buffers allocated to headers.
The 82598 places no alignment restrictions on receive memory buffer addresses. This is desirable in
situations where the receive buffer was allocated by higher layers in the networking software stack, as
these higher layers might have no knowledge of a specific device's buffer alignment requirements.
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