InfiniBand Network Architecture

CM MAD Format

Table 36-1 on this page defines the format of a CM MAD. A detailed description of MADs can be found in “Detailed Description of MADs” on page 779.

Table 36-1. CommMgt MAD Format

Dword		Byte 0	Byte 1	Byte 2	Byte 3
0	Base MAD Header	Base Version = 01h	Management Class = ComMgt	Class Version = 01h	R	ComMgt Method (see Table 36-2 on page 1071).
1		Status is only meaningful in response packets. See Table 27-2 on page 776. Note that there are no CM-specific status bits.		Not used
2		Transaction ID
3
4		CM AttributeID (see Table 36-3 on page 1072).		Reserved
5		AttributeModifier (not used for any of the CM attributes)
6–63	CM- specific ields	In a ComMgtGet(ClassPortInfo), this data area is unused. In a ComMgtSet(ClassPortInfo), this data area contains the data to be written ...