# 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® network adapters. If the main network adapter is used for both EtherCAT® network adapters and the local area network there may be a major 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`](_downloads/bf62c71a4a7e317930818b9da4a9815c/EcSelectLinkLayer.cpp) demonstrates how to initialize the Ethernet Driver instance.

### struct EC_T_LINK_PARMS_BPF

### Public Members

### [EC_T_LINK_PARMS](emll_init.html.md#_CPPv415EC_T_LINK_PARMS) linkParms

Common link parameters. Signature must be set to EC_LINK_PARMS_SIGNATURE_BPF. 

### [EC_T_CHAR](toc_api.html.md#_CPPv49EC_T_CHAR) szIfName[EC_BPF_IF_NAME_SIZE]

Name of Ethernet Interface 

### [EC_T_CHAR](toc_api.html.md#_CPPv49EC_T_CHAR) szPrefix[EC_BPF_IF_NAME_SIZE]

Optional prefix of the BPF instance path 

### [EC_T_DWORD](toc_api.html.md#_CPPv410EC_T_DWORD) dwRxBuffers

Receive buffer count