Layers in CAs, Switches and Routers
Refer to Figure 6-3 on page 112.
Figure 6-3. Layers
HCA Layers
A 2-port HCA is pictured in the illustration (but recognize that it may have as few as one or as many as 255 ports). Software communicates with the HCA by issuing calls to the Verb interface. The verbs provide the interface between software and the QP message transfer engines implemented as part of the Transport Layer. Each RC, UC, and UD QP, as well as RD EECs, within the Transport Layer is set up to exchange messages through a specific HCA port. Each of the ports implements its own Network, Link, and Physical Layers.
TCA Layers
The only manner in ...
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