InfiniBand Network Architecture

Detailed Switch Handling of SMPs

Switch Handling of an Inbound Request SMP

When a port's Link Layer receives an inbound request SMP from the SM, it is processed as follows:

1.	The SMP packet is received into the port's VL15 receive buffer. It should be noted that if the buffer is currently full—the minimum required buffer depth is one SMP packet—then the inbound SMP is discarded.
2.	The SMP's DLID address is used to route the packet. Based on the address in the DLID field, there are three possible cases: - DLID = PLID address. This is a directed-route SMP. The receiving port passes the directed-route SMP to port 0's SMI RQ Logic for processing. A detailed description of directed-route SMPs can be found in “Discovery” on page 871. - DLID contains ...