5.6. Berkeley Packet Filter - emllBPF

The Ethernet Driver BPF is always part of the EC-Master for QNX package. It uses already established Ethernet adapters, e.g. wm0, rt0, etc. It is strongly recommended to use a separate network adapter to connect EtherCAT devices. If the main network adapter is used for both EtherCAT devices and the local area network there may be a main impact on the local area network operation.

Note

The BPF Ethernet Driver cannot be used for real time applications and may need cycle time of 1 ms or higher.

The parameters to the Ethernet Driver BPF are setup-specific. The function CreateLinkParmsFromCmdLineBPF() in EcSelectLinkLayer.cpp demonstrates how to initialize the Ethernet Driver instance.

struct EC_T_LINK_PARMS_BPF

Public Members

EC_T_LINK_PARMS linkParms

Common link parameters. Signature must be set to EC_LINK_PARMS_SIGNATURE_BPF

EC_T_CHAR szIfName[EC_BPF_IF_NAME_SIZE]

Name of Ethernet Interface

EC_T_CHAR szPrefix[EC_BPF_IF_NAME_SIZE]

Optional prefix of the BPF instance path

EC_T_DWORD dwRxBuffers

Receive buffer count