User Manual

Rev 2.2-1.0.1

Mellanox Technologies

1.5.2.9 Using rdma_cm Tests

Step 1. Use rdma_cm test on the server.

# ucmatose

cmatose: starting server

initiating data transfers

completing sends

receiving data transfers

data transfers complete

cmatose: disconnecting

disconnected

test complete

return status 0

Step 2. Use rdma_cm test on the client.

# ucmatose -s 20.4.3.219

cmatose: starting client

cmatose: connecting

receiving data transfers

sending replies

data transfers complete

test complete

return status 0

This server-client run is without PCP or VLAN because the IP address used does not belong to a

VLAN interface. If you specify a VLAN IP address, then the traffic should go over VLAN.

1.5.2.10 Type Of Service (TOS)

The TOS field for rdma_cm sockets can be set using the rdma_set_option() API, just as it is set

for regular sockets. If a

TOS is not set, the default value (0) is used. Within the rdma_cm kernel

driver, the TOS field is converted into an SL field. The conversion formula is as follows:

• SL = TOS >> 5 (e.g., take the 3 most significant bits of the TOS field)

In the hardware driver, the SL field is converted into PCP by the following formula:

• PCP = SL & 7 (take the 3 least significant bits of the TOS field)

SL affects the PCP only when the traffic goes over tagged VLAN frames.