5.1. Link Layer initialization

The different Link Layer modules are selected and parameterized by a Link Layer specific structure. Each Link Layer specific structure start with a common EC_T_LINK_PARMS structure, followed by some Link Layer specific members. The common link parameter structure is passed to EC_T_INIT_MASTER_PARMS::pLinkParms with the call of emInitMaster() like in the following example:

/* identify Link Layer in the common struture */
oLinkParmsSockRaw.linkParms.dwSignature = EC_LINK_PARMS_SIGNATURE_SOCKRAW;
oLinkParmsSockRaw.linkParms.dwSize = sizeof(EC_T_LINK_PARMS_SOCKRAW);
OsStrncpy(&oLinkParmsSockRaw.linkParms.szDriverIdent, EC_LINK_PARMS_IDENT_SOCKRAW, EC_DRIVER_IDENT_MAXLEN);

/* specific Link Layer parameters should be set here */

/* pass Link Layer parameters */
oInitMasterParms.dwSignature = ATECAT_SIGNATURE;
oInitMasterParms.dwSize = sizeof(EC_T_INIT_MASTER_PARMS);
oInitMasterParms.pLinkParms = &oLinkParmsSockRaw.linkParms;

/* more parameters should be set here */

/* initialize master */
emInitMaster(dwInstanceId, &oInitMasterParms);

struct EC_T_LINK_PARMS

Public Members

EC_T_DWORD dwSignature

[in] Signature of the adapter specific structure containing the EC_T_LINK_PARMS structure

EC_T_DWORD dwSize

[in] Size of the adapter specific structure containing the EC_T_LINK_PARMS structure

EC_T_LOG_PARMS LogParms

[in] Logging parameters

EC_T_CHAR szDriverIdent[EC_DRIVER_IDENT_NAMESIZE]

[in] Name of Link Layer module (driver identification) for Link Layer Selection

EC_T_DWORD dwInstance

[in] Instance of the adapter. if EC_LINKUNIT_PCILOCATION is set: contains PCI address

EC_T_LINKMODE eLinkMode

[in] Mode of operation

EC_T_CPUSET cpuIstCpuAffinityMask

[in] Interrupt service thread CPU affinity mask

EC_T_DWORD dwIstPriority

[in] Task priority of the interrupt service task (not used in polling mode)

enum EC_T_PHYINTERFACE

Values:

enumerator ePHY_FIXED_LINK

No PHY access at all

enumerator ePHY_MII

MII 10 / 100 MBit

enumerator ePHY_RMII

Reduced MII, 10 / 100 MBit

enumerator ePHY_GMII

Gigabit MII, 10, 100, 1000 MBit

enumerator ePHY_SGMII

Serial (SERDES) Gigabit MII, 10, 100, 1000 MBit

enumerator ePHY_RGMII

Reduced Gigabit MII, 10, 100, 1000 MBit

enumerator ePHY_OSDRIVER

Get interface type from OS

enumerator ePHY_RMII_50MHZ

ePHY_RMII with 50 MHz clock mode

enumerator ePHY_BCppDummy

struct EC_T_LINK_TTS

Public Members

EC_T_BOOL bEnabled

[in] Use Time-Triggered Send

EC_T_DWORD dwCycleTimeUsec

[in] Cycle time between 2 pfnStartCycle calls

EC_T_DWORD dwSendOffsetUsec

[in] Time between pfnStartCycle call and frame transmission

EC_T_LINK_TTS_CALLBACK pfnStartCycle

[in] Callback function called cyclically according dwCycleTimeUsec

EC_T_VOID *pvStartCycleContext

[in] Context passed to each pfnTtsStartCycle call

5.1.1. Link Layer instance selection via PCI-Location

For some operating systems it is possible to address the Link Layer instance using its PCI address as an alternative. To do this, EC_LINKUNIT_PCILOCATION (0x01000000) and the PCI location must be set as EC_T_LINK_PARMS::dwInstance.

On Linux the PCI address can be shown using e.g.:

lspci | grep Ethernet

00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-LM (rev 04)
04:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
05:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection

The format of EC_T_LINK_PARMS::dwInstance using PCI bus address is:

0x01bbddff

• bb Bus Number

• dd Device Number

• ff Function Number

EC_T_LINK_PARMS::dwInstance = 0x01001900; //"0000:00:19.0"

On Windows the integer value displayed in properties dialog must be converted to HEX. E.g the number from the following dialog (PCI bus 11, device 0, function 0) corresponds to 0x010B0000 (bus 0x0B).