Provided by: libibumad-dev_1.3.8-1ubuntu1_amd64 
NAME
umad_send - send umad
SYNOPSIS
#include <infiniband/umad.h>
int umad_send(int portid, int agentid, void *umad, int length, int timeout_ms, int retries);
DESCRIPTION
umad_send() sends length bytes from the specified umad buffer from the port specified by portid, and
using the agent specified by agentid. timeout_ms controls the solicited MADs behavior as follows: zero
value means not solicited. Positive value makes kernel indicate timeout in milliseconds. If reply is not
received within the specified value, the original buffer is returned in the read channel with the status
field set (to non zero). Negative timeout_ms makes kernel wait forever for the reply. retries indicates
the number of times the MAD will be retried before giving up.
RETURN VALUE
umad_send() returns 0 on success, and a negative value on error as follows:
-EINVAL invalid port handle or agentid
-EIO send operation failed
AUTHOR
Hal Rosenstock <halr@voltaire.com>