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|Sun Network QDR InfiniBand Gateway Switch HTML Document Collection for Firmware Version 2.0|
The gateway supports several partitions in the InfiniBand fabric. You assign a P_Key to each partition as a simplified means of identifying the partition to the Subnet Manager. P_Keys are 15-bit integers and have a value of 0x1 to 0x7fff. A P_Key value of 0x7fff represents the default partition.
An additional bit, the membership bit, can identify the membership of the partition:
Full – The membership bit is 1. Full membership permits communication to all members within a partition.
Limited – The membership bit is 0. Limited membership permits communication only with a full member.
Combined together, P_Key and the membership bit comprise a 16-bit integer, and the most significant bit is the membership bit. In a full membership, the membership bit is set high. When this happens, the P_Key value is effectively increased by 0x8000. Similarly, if you were to define a P_Key with a value greater than 0x8000, the membership bit is automatically set to 1, and consequently is given full membership.
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