Send and send with immediate operation
The send operation sends data to the receive queue of a remote Queue Pair (QP).
To receive the data, the receiver must post data into a receive buffer. The sender does not have any control over the data that is in the remote host.
An immediate 4-byte value is transmitted with the data buffer. This immediate value is presented to the receiver as part of the receive notification, and it is not contained in the data buffer.