Configurable IPv6/UDP Transport-Plugin properties. More...

Public Attributes
struct NDDS_Transport_Property_t	parent
	Generic properties of all transport plugins.

RTI_INT32	send_socket_buffer_size
	Size in bytes of the send buffer of a socket used for sending.

RTI_INT32	recv_socket_buffer_size
	Size in bytes of the receive buffer of a socket used for receiving.

RTI_INT32	unicast_enabled
	Allows the transport plugin to use unicast for sending and receiving.

RTI_INT32	multicast_enabled
	Allows the transport plugin to use multicast for sending and receiving.

RTI_INT32	multicast_ttl
	Value for the time-to-live parameter for all multicast sends using this plugin.

RTI_INT32	multicast_loopback_disabled
	Prevents the transport plugin from putting multicast packets onto the loopback interface.

RTI_INT32	ignore_loopback_interface
	Prevents the transport plugin from using the IP loopback interface.

RTI_INT32	ignore_nonrunning_interfaces
	Prevents the transport plugin from using a network interface that is not reported as RUNNING by the operating system.

RTI_INT32	no_zero_copy
	Prevents the transport plugin from doing zero copy.

RTI_INT32	send_blocking
	Control blocking behavior of send sockets. CHANGING THIS FROM THE DEFAULT CAN CAUSE SIGNIFICANT PERFORMANCE PROBLEMS.

RTI_INT32	enable_v4mapped
	Specify whether UDPv6 transport will process IPv4 addresses.

RTI_UINT32	transport_priority_mask
	Set mask for use of transport priority field.

RTI_INT32	transport_priority_mapping_low
	Set low value of output range to IPv6 TCLASS.

RTI_INT32	transport_priority_mapping_high
	Set high value of output range to IPv6 TCLASS.

Detailed Description

Configurable IPv6/UDP Transport-Plugin properties.

The properties in this structure can be modified by the end user to configure the plugin. However, the properties must be set before the plugin is instantiated.

See Also: NDDSTransportSupport::set_builtin_transport_property(); NDDS_Transport_UDPv6_new

Member Data Documentation

struct NDDS_Transport_Property_t NDDS_Transport_UDPv6_Property_t::parent

Generic properties of all transport plugins.

RTI_INT32 NDDS_Transport_UDPv6_Property_t::send_socket_buffer_size

Size in bytes of the send buffer of a socket used for sending.

On most operating systems, setsockopt() will be called to set the SENDBUF to the value of this parameter.

This value must be greater than or equal to NDDS_Transport_Property_t::message_size_max. The maximum value is operating system-dependent.

By default, it will be set to be NDDS_TRANSPORT_UDPV6_SEND_SOCKET_BUFFER_SIZE_DEFAULT.

If users configure this parameter to be NDDS_TRANSPORT_UDPV6_SOCKET_BUFFER_SIZE_OS_DEFAULT, then setsockopt() (or equivalent) will not be called to size the send buffer of the socket.

See Also: NDDS_TRANSPORT_UDPV6_SEND_SOCKET_BUFFER_SIZE_DEFAULT; NDDS_TRANSPORT_UDPV6_SOCKET_BUFFER_SIZE_OS_DEFAULT

RTI_INT32 NDDS_Transport_UDPv6_Property_t::recv_socket_buffer_size

Size in bytes of the receive buffer of a socket used for receiving.

On most operating systems, setsockopt() will be called to set the RECVBUF to the value of this parameter.

This value must be greater than or equal to NDDS_Transport_Property_t::message_size_max. The maximum value is operating system-dependent.

By default, it will be set to be NDDS_TRANSPORT_UDPV6_RECV_SOCKET_BUFFER_SIZE_DEFAULT.

If it is set to NDDS_TRANSPORT_UDPV6_SOCKET_BUFFER_SIZE_OS_DEFAULT, then setsockopt() (or equivalent) will not be called to size the receive buffer of the socket.

See Also: NDDS_TRANSPORT_UDPV6_RECV_SOCKET_BUFFER_SIZE_DEFAULT; NDDS_TRANSPORT_UDPV6_SOCKET_BUFFER_SIZE_OS_DEFAULT

RTI_INT32 NDDS_Transport_UDPv6_Property_t::unicast_enabled

Allows the transport plugin to use unicast for sending and receiving.

This value turns unicast UDP on (if set to 1) or off (if set to 0) for this plugin. By default, it will be turned on (1). Also by default, the plugin will use all the allowed network interfaces that it finds up and running when the plugin is instanced.

RTI_INT32 NDDS_Transport_UDPv6_Property_t::multicast_enabled

Allows the transport plugin to use multicast for sending and receiving.

This value turns multicast UDP on (if set to 1) or off (if set to 0) for this plugin. By default, it will be turned on (1) for those platforms that support multicast. Also by default, the plugin will use the all network interfaces allowed for multicast that it finds up and running when the plugin is instanced.

RTI_INT32 NDDS_Transport_UDPv6_Property_t::multicast_ttl

Value for the time-to-live parameter for all multicast sends using this plugin.

This is used to set the TTL of multicast packets sent by this transport plugin.

See Also: NDDS_TRANSPORT_UDPV6_MULTICAST_TTL_DEFAULT

RTI_INT32 NDDS_Transport_UDPv6_Property_t::multicast_loopback_disabled

Prevents the transport plugin from putting multicast packets onto the loopback interface.

If multicast loopback is disabled (this value is set to 1), then when sending multicast packets, RTI Connext will not put a copy of the packets on the loopback interface. This prevents applications on the same node (including itself) from receiving those packets.

This value is set to 0 by default, meaning multicast loopback is enabled.

Disabling multicast loopback (setting this value to 1) may result in minor performance gains when using multicast.

RTI_INT32 NDDS_Transport_UDPv6_Property_t::ignore_loopback_interface

Prevents the transport plugin from using the IP loopback interface.

Currently three values are allowed:

0: Forces local traffic to be sent over loopback, even if a more efficient transport (such as shared memory) is installed (in which case traffic will be sent over both transports).

1: Disables local traffic via this plugin. Do not use the IP loopback interface even if no NICs are discovered. This is useful when you want applications running on the same node to use a more efficient transport (such as shared memory) instead of the IP loopback.

-1: Automatic. Lets RTI Connext decide between the above two choices.

The current "automatic" (-1) RTI Connext policy is as follows.

If a shared memory transport plugin is available for local traffic and there is a locator on the initial peers list that can use shared memory, the effective value is 1 (i.e., disable UDPv6 local traffic).
Otherwise, the effective value is 0 (i.e., use UDPv6 for local traffic also).

[default] -1 Automatic RTI Connext policy based on availability of the shared memory transport.

RTI_INT32 NDDS_Transport_UDPv6_Property_t::ignore_nonrunning_interfaces

Prevents the transport plugin from using a network interface that is not reported as RUNNING by the operating system.

The transport checks the flags reported by the operating system for each network interface upon initialization. An interface which is not reported as UP will not be used. This property allows the same check to be extended to the IFF_RUNNING flag implemented by some operating systems. The RUNNING flag is defined to mean that "all resources are allocated", and may be off if there is no link detected, e.g., the network cable is unplugged.

Two values are allowed:

0: Do not check the RUNNING flag when enumerating interfaces, just make sure interface is UP.

1: Check flag when enumerating interfaces and ignore those that are not reported as RUNNING. This can be used on some operating systems to cause the transport to ignore interfaces that are enabled but not connected to the network.

[default] 0 (i.e., do not check RUNNING flag)

RTI_INT32 NDDS_Transport_UDPv6_Property_t::no_zero_copy

Prevents the transport plugin from doing zero copy.

By default, this plugin will use the zero copy on OSs that offer it. While this is good for performance, it may sometimes tax the OS resources in a manner that cannot be overcome by the application.

The best example is if the hardware/device driver lends the buffer to the application itself. If the application does not return the loaned buffers soon enough, the node may error or malfunction. If you cannot reconfigure the H/W, device driver, or the OS to allow the zero copy feature to work for your application, you may have no choice but to turn off the use of zero copy.

By default this is set to 0, so RTI Connext will use the zero copy API if offered by the OS.

RTI_INT32 NDDS_Transport_UDPv6_Property_t::send_blocking

Control blocking behavior of send sockets. CHANGING THIS FROM THE DEFAULT CAN CAUSE SIGNIFICANT PERFORMANCE PROBLEMS.

Currently two values are defined:

NDDS_TRANSPORT_UDPV6_BLOCKING_ALWAYS: Sockets are blocking (default socket options for Operating System).

NDDS_TRANSPORT_UDPV6_BLOCKING_NEVER: Sockets are modified to make them non-blocking. THIS IS NOT A SUPPORTED CONFIGURATION AND MAY CAUSE SIGNIFICANT PERFORMANCE PROBLEMS.

[default] NDDS_TRANSPORT_UDPV6_BLOCKING_ALWAYS.

RTI_INT32 NDDS_Transport_UDPv6_Property_t::enable_v4mapped

Specify whether UDPv6 transport will process IPv4 addresses.

Set this to 1 to turn on processing of IPv4 addresses. Note that this may make it incompatible with use of the UDPv4 transport within the same domain participant.

[default] 0.

RTI_UINT32 NDDS_Transport_UDPv6_Property_t::transport_priority_mask

Set mask for use of transport priority field.

If transport priority mapping is supported on the platform, this mask is used in conjunction with NDDS_Transport_UDPv6_Property_t::transport_priority_mapping_low and NDDS_Transport_UDPv6_Property_t::transport_priority_mapping_high to define the mapping from DDS transport priority (see TRANSPORT_PRIORITY) to the IPv6 TCLASS field. Defines a contiguous region of bits in the 32-bit transport priority value that is used to generate values for the IPv6 TCLASS field on an outgoing socket. (See the Getting Started Guide to find out if the transport priority is supported on a specific platform.)

For example, the value 0x0000ff00 causes bits 9-16 (8 bits) to be used in the mapping. The value will be scaled from the mask range (0x0000 - 0xff00 in this case) to the range specified by low and high.

If the mask is set to zero, then the transport will not set IPv6 TCLASS for send sockets.

[default] 0.

RTI_INT32 NDDS_Transport_UDPv6_Property_t::transport_priority_mapping_low

Set low value of output range to IPv6 TCLASS.

This is used in conjunction with NDDS_Transport_UDPv6_Property_t::transport_priority_mask and NDDS_Transport_UDPv6_Property_t::transport_priority_mapping_high to define the mapping from DDS transport priority to the IPv6 TCLASS field. Defines the low value of the output range for scaling.

Note that IPv6 TCLASS is generally an 8-bit value.

[default] 0.

RTI_INT32 NDDS_Transport_UDPv6_Property_t::transport_priority_mapping_high

Set high value of output range to IPv6 TCLASS.

This is used in conjunction with NDDS_Transport_UDPv6_Property_t::transport_priority_mask and NDDS_Transport_UDPv6_Property_t::transport_priority_mapping_low to define the mapping from DDS transport priority to the IPv6 TCLASS field. Defines the high value of the output range for scaling.

Note that IPv6 TCLASS is generally an 8-bit value.

[default] 0xff.

Public Attributes

Detailed Description

Member Data Documentation