.\" Licensed under the OpenIB.org BSD license (FreeBSD Variant) - See COPYING.md
.TH "RDMA_SET_OPTION" 3 "2007-08-06" "librdmacm" "Librdmacm Programmer's Manual" librdmacm
.SH NAME
rdma_set_option \- Set communication options for an rdma_cm_id.
.SH SYNOPSIS
.B "#include <rdma/rdma_cma.h>"
.P
.B "int" rdma_set_option
.BI "(struct rdma_cm_id *" id ","
.BI "int " level ","
.BI "int " optname ","
.BI "void *" optval ","
.BI "size_t " optlen ");"
.SH ARGUMENTS
.IP "id" 12
RDMA identifier.
.IP "level" 12
Protocol level of the option to set.
.IP "optname" 12
Name of the option, relative to the level, to set.
.IP "optval" 12
Reference to the option data.  The data is dependent on the level and optname.
.IP "optlen" 12
The size of the %optval buffer.
.SH "DESCRIPTION"
Sets communication options for an rdma_cm_id.  This call is used to override
the default system settings.
.IP "optname can be one of" 12
.IP "RDMA_OPTION_ID_TOS" 12
Specify the quality of service provided by a connection.
The expected optlen is size of uint8_t.
.IP "RDMA_OPTION_ID_REUSEADDR" 12
Bound the rdma_cm_id to a reuseable address. This will allow other users to bind to that same address.
The expected optlen is size of int.
.IP "RDMA_OPTION_ID_AFONLY" 12
Set IPV6_V6ONLY socket.
The expected optlen is size of int.
.IP "RDMA_OPTION_IB_PATH" 12
Set IB path record data.
The expected optlen is size of struct ibv_path_data[].
.IP "RDMA_OPTION_ID_ACK_TIMEOUT" 12
Set QP ACK timeout.
The value calculated according to the formula 4.096 * 2^(ack_timeout) usec.
.SH "RETURN VALUE"
Returns 0 on success, or -1 on error.  If an error occurs, errno will be
set to indicate the failure reason.
.SH "NOTES"
Option details may be found in the relevant header files.
.SH "SEE ALSO"
rdma_create_id(3)