5812-DS00-R datasheet(77/84 Pages) BOARDCOM

77 / 84 page

Advance Data Sheet

BCM5812

3/11/03

B roa dcom Co rpo rat ion

Document

5812-DS01-405-R

Invalid Operation Conditions

Page 69

Ap pe nd ix B : Pr og ra mmi ng Co nsi d era t io n s

This Appendix summarizes Invalid Operation Conditions, Chaining Restrictions, and Alignment Restrictions mentioned in

the text.

INVALID OPERATION CONDITIONS

This section summarizes the conditions that cause unpredictable results being written to memory, or possibly in a hang

condition.

ZERO PACKET LENGTHS

IPsec operations should never be supplied a zero packet length parameter in the packet descriptor. The offset field in the

command context should never be equal to or greater than the packet length.

ZERO FRAGMENT LENGTHS IN FRAGMENT CHAIN ENTRY DESCRIPTORS

All buffer lengths in input and output fragment chain entries that refer to actual data buffers must contain non-zero values.

ERRONEOUS PARAMETER SPECIFICATIONS

Situations such as illegal authentication specifiers, misaligned structure members, or misaligned output packet payload data,

should be guaranteed to never occur.

OUTPUT FRAGMENT ADDRESSES FOR MISALIGNED BUFFERS

All output data should be aligned on 32-bit boundaries. See “Alignment Restrictions” on page 71.

OUTPUT FRAGMENT LENGTHS THAT ARE NOT A MULTIPLE OF 4

All output data buffers must have a length that is multiple of 32-bits. See “Alignment Restrictions” on page 71.

NON-ZERO OFFSET WITH NULL ENCRYPTION

The offset must be zero with NULL encryption specified.

NULL AUTHENTICATION WITH NULL ENCRYPTION

At least one of authentication or encryption must be specified.

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