for (i = 0; i < 4; i++) {			pPacket->Random[i] = pAC->Rlmt.Port[PortNumber].Random[i];		}		SK_U16_TO_NETWORK_ORDER(			SK_RLMT_PACKET_VERSION, &pPacket->RlmtPacketVersion[0]);		for (i = 0; i < SK_PACKET_DATA_LEN; i++) {			pPacket->Data[i] = 0x00;		}		Length = SK_RLMT_MAX_PACKET_SIZE;	/* Or smaller. */		pMb->Length = Length;		pMb->PortIdx = PortNumber;		Length -= 14;		SK_U16_TO_NETWORK_ORDER(Length, &pPacket->TypeLen[0]);		if (PacketType == SK_PACKET_ALIVE) {			pAC->Rlmt.Port[PortNumber].TxHelloCts++;		}	}	return (pMb);}	/* SkRlmtBuildPacket *//****************************************************************************** * *	SkRlmtBuildSpanningTreePacket - build spanning tree check packet * * Description: *	This routine sets up a BPDU packet for spanning tree check. * * Context: *	runtime, pageable? * * Returns: *	NULL or pointer to RLMT mbuf */RLMT_STATIC SK_MBUF	*SkRlmtBuildSpanningTreePacket(SK_AC	*pAC,		/* Adapter Context */SK_IOC	IoC,		/* I/O Context */SK_U32	PortNumber)	/* Sending port */{	unsigned			i;	SK_U16				Length;	SK_MBUF				*pMb;	SK_SPTREE_PACKET	*pSPacket;	if ((pMb = SkDrvAllocRlmtMbuf(pAC, IoC, SK_RLMT_MAX_PACKET_SIZE)) !=		NULL) {		pSPacket = (SK_SPTREE_PACKET*)pMb->pData;		for (i = 0; i < SK_MAC_ADDR_LEN; i++) {			pSPacket->DstAddr[i] = BridgeMcAddr.a[i];			pSPacket->SrcAddr[i] =				pAC->Addr.Port[PortNumber].CurrentMacAddress.a[i];		}		pSPacket->DSap = SK_RLMT_SPT_DSAP;		pSPacket->SSap = SK_RLMT_SPT_SSAP;		pSPacket->Ctrl = SK_RLMT_SPT_CTRL;		pSPacket->ProtocolId[0] = SK_RLMT_SPT_PROTOCOL_ID0;		pSPacket->ProtocolId[1] = SK_RLMT_SPT_PROTOCOL_ID1;		pSPacket->ProtocolVersionId = SK_RLMT_SPT_PROTOCOL_VERSION_ID;		pSPacket->BpduType = SK_RLMT_SPT_BPDU_TYPE;		pSPacket->Flags = SK_RLMT_SPT_FLAGS;		pSPacket->RootId[0] = SK_RLMT_SPT_ROOT_ID0;		pSPacket->RootId[1] = SK_RLMT_SPT_ROOT_ID1;		pSPacket->RootPathCost[0] = SK_RLMT_SPT_ROOT_PATH_COST0;		pSPacket->RootPathCost[1] = SK_RLMT_SPT_ROOT_PATH_COST1;		pSPacket->RootPathCost[2] = SK_RLMT_SPT_ROOT_PATH_COST2;		pSPacket->RootPathCost[3] = SK_RLMT_SPT_ROOT_PATH_COST3;		pSPacket->BridgeId[0] = SK_RLMT_SPT_BRIDGE_ID0;		pSPacket->BridgeId[1] = SK_RLMT_SPT_BRIDGE_ID1;		/*		 * Use logical MAC address as bridge ID and filter these packets		 * on receive.		 */		for (i = 0; i < SK_MAC_ADDR_LEN; i++) {			pSPacket->BridgeId[i + 2] = pSPacket->RootId[i + 2] =				pAC->Addr.Net[pAC->Rlmt.Port[PortNumber].Net->NetNumber].					CurrentMacAddress.a[i];		}		pSPacket->PortId[0] = SK_RLMT_SPT_PORT_ID0;		pSPacket->PortId[1] = SK_RLMT_SPT_PORT_ID1;		pSPacket->MessageAge[0] = SK_RLMT_SPT_MSG_AGE0;		pSPacket->MessageAge[1] = SK_RLMT_SPT_MSG_AGE1;		pSPacket->MaxAge[0] = SK_RLMT_SPT_MAX_AGE0;		pSPacket->MaxAge[1] = SK_RLMT_SPT_MAX_AGE1;		pSPacket->HelloTime[0] = SK_RLMT_SPT_HELLO_TIME0;		pSPacket->HelloTime[1] = SK_RLMT_SPT_HELLO_TIME1;		pSPacket->ForwardDelay[0] = SK_RLMT_SPT_FWD_DELAY0;		pSPacket->ForwardDelay[1] = SK_RLMT_SPT_FWD_DELAY1;		Length = SK_RLMT_MAX_PACKET_SIZE;	/* Or smaller. */		pMb->Length = Length;		pMb->PortIdx = PortNumber;		Length -= 14;		SK_U16_TO_NETWORK_ORDER(Length, &pSPacket->TypeLen[0]);		pAC->Rlmt.Port[PortNumber].TxSpHelloReqCts++;	}	return (pMb);}	/* SkRlmtBuildSpanningTreePacket *//****************************************************************************** * *	SkRlmtSend - build and send check packets * * Description: *	Depending on the RLMT state and the checking state, several packets *	are sent through the indicated port. * * Context: *	runtime, pageable? * * Returns: *	Nothing. */RLMT_STATIC void	SkRlmtSend(SK_AC	*pAC,		/* Adapter Context */SK_IOC	IoC,		/* I/O Context */SK_U32	PortNumber)	/* Sending port */{	unsigned	j;	SK_EVPARA	Para;	SK_RLMT_PORT	*pRPort;	pRPort = &pAC->Rlmt.Port[PortNumber];	if (pAC->Rlmt.Port[PortNumber].Net->RlmtMode & SK_RLMT_CHECK_LOC_LINK) {		if (pRPort->CheckingState & (SK_RLMT_PCS_TX | SK_RLMT_PCS_RX)) {			/* Port is suspicious. Send the RLMT packet to the RLMT mc addr. */			if ((Para.pParaPtr = SkRlmtBuildPacket(pAC, IoC, PortNumber,				SK_PACKET_ALIVE, &pAC->Addr.Port[PortNumber].CurrentMacAddress,				&SkRlmtMcAddr)) != NULL) {				SkEventQueue(pAC, SKGE_DRV, SK_DRV_RLMT_SEND, Para);			}		}		else {			/*			 * Send a directed RLMT packet to all ports that are			 * checked by the indicated port.			 */			for (j = 0; j < pRPort->PortsChecked; j++) {				if ((Para.pParaPtr = SkRlmtBuildPacket(pAC, IoC, PortNumber,					SK_PACKET_ALIVE, &pAC->Addr.Port[PortNumber].CurrentMacAddress,					&pRPort->PortCheck[j].CheckAddr)) != NULL) {					SkEventQueue(pAC, SKGE_DRV, SK_DRV_RLMT_SEND, Para);				}			}		}	}	if ((pAC->Rlmt.Port[PortNumber].Net->RlmtMode & SK_RLMT_CHECK_SEG) &&		(pAC->Rlmt.Port[PortNumber].Net->CheckingState & SK_RLMT_RCS_SEND_SEG)) {		/*		 * Send a BPDU packet to make a connected switch tell us		 * the correct root bridge.		 */		if ((Para.pParaPtr =			SkRlmtBuildSpanningTreePacket(pAC, IoC, PortNumber)) != NULL) {			pAC->Rlmt.Port[PortNumber].Net->CheckingState &= ~SK_RLMT_RCS_SEND_SEG;			pRPort->RootIdSet = SK_FALSE;			SkEventQueue(pAC, SKGE_DRV, SK_DRV_RLMT_SEND, Para);			SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_TX,				("SkRlmtSend: BPDU Packet on Port %u.\n", PortNumber))		}	}	return;}	/* SkRlmtSend *//****************************************************************************** * *	SkRlmtPortReceives - check if port is (going) down and bring it up * * Description: *	This routine checks if a port who received a non-BPDU packet *	needs to go up or needs to be stopped going down. * * Context: *	runtime, pageable? * * Returns: *	Nothing. */RLMT_STATIC void	SkRlmtPortReceives(SK_AC	*pAC,			/* Adapter Context */SK_IOC	IoC,			/* I/O Context */SK_U32	PortNumber)		/* Port to check */{	SK_RLMT_PORT	*pRPort;	SK_EVPARA		Para;	pRPort = &pAC->Rlmt.Port[PortNumber];	pRPort->PortNoRx = SK_FALSE;	if ((pRPort->PortState == SK_RLMT_PS_DOWN) &&		!(pRPort->CheckingState & SK_RLMT_PCS_TX)) {		/*		 * Port is marked down (rx), but received a non-BPDU packet.		 * Bring it up.		 */		SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_RX,			("SkRlmtPacketReceive: Received on PortDown.\n"))		pRPort->PortState = SK_RLMT_PS_GOING_UP;		pRPort->GuTimeStamp = SkOsGetTime(pAC);		Para.Para32[0] = PortNumber;		Para.Para32[1] = (SK_U32)-1;		SkTimerStart(pAC, IoC, &pRPort->UpTimer, SK_RLMT_PORTUP_TIM_VAL,			SKGE_RLMT, SK_RLMT_PORTUP_TIM, Para);		pRPort->CheckingState &= ~SK_RLMT_PCS_RX;		/* pAC->Rlmt.CheckSwitch = SK_TRUE; */		SkRlmtCheckSwitch(pAC, IoC, pRPort->Net->NetNumber);	}	/* PortDown && !SuspectTx */	else if (pRPort->CheckingState & SK_RLMT_PCS_RX) {		SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_RX,			("SkRlmtPacketReceive: Stop bringing port down.\n"))		SkTimerStop(pAC, IoC, &pRPort->DownRxTimer);		pRPort->CheckingState &= ~SK_RLMT_PCS_RX;		/* pAC->Rlmt.CheckSwitch = SK_TRUE; */		SkRlmtCheckSwitch(pAC, IoC, pRPort->Net->NetNumber);	}	/* PortGoingDown */	return;}	/* SkRlmtPortReceives *//****************************************************************************** * *	SkRlmtPacketReceive - receive a packet for closer examination * * Description: *	This routine examines a packet more closely than SK_RLMT_LOOKAHEAD. * * Context: *	runtime, pageable? * * Returns: *	Nothing. */RLMT_STATIC void	SkRlmtPacketReceive(SK_AC	*pAC,	/* Adapter Context */SK_IOC	IoC,	/* I/O Context */SK_MBUF	*pMb)	/* Received packet */{#ifdef xDEBUG	extern	void DumpData(char *p, int size);#endif	/* DEBUG */	int					i;	unsigned			j;	SK_U16				PacketType;	SK_U32				PortNumber;	SK_ADDR_PORT		*pAPort;	SK_RLMT_PORT		*pRPort;	SK_RLMT_PACKET		*pRPacket;	SK_SPTREE_PACKET	*pSPacket;	SK_EVPARA			Para;	PortNumber	= pMb->PortIdx;	pAPort = &pAC->Addr.Port[PortNumber];	pRPort = &pAC->Rlmt.Port[PortNumber];	SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_RX,		("SkRlmtPacketReceive: PortNumber == %d.\n", PortNumber))	pRPacket = (SK_RLMT_PACKET*)pMb->pData;	pSPacket = (SK_SPTREE_PACKET*)pRPacket;#ifdef xDEBUG	DumpData((char *)pRPacket, 32);#endif	/* DEBUG */	if ((pRPort->PacketsPerTimeSlot - pRPort->BpduPacketsPerTimeSlot) != 0) {		SkRlmtPortReceives(pAC, IoC, PortNumber);	}	/* Check destination address. */	if (!SK_ADDR_EQUAL(pAPort->CurrentMacAddress.a, pRPacket->DstAddr) &&		!SK_ADDR_EQUAL(SkRlmtMcAddr.a, pRPacket->DstAddr) &&		!SK_ADDR_EQUAL(BridgeMcAddr.a, pRPacket->DstAddr)) {		/* Not sent to current MAC or registered MC address => Trash it. */		SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_RX,			("SkRlmtPacketReceive: Not for me.\n"))		SkDrvFreeRlmtMbuf(pAC, IoC, pMb);		return;	}	else if (SK_ADDR_EQUAL(pAPort->CurrentMacAddress.a, pRPacket->SrcAddr)) {		/*		 * Was sent by same port (may happen during port switching		 * or in case of duplicate MAC addresses).		 */		/*		 * Check for duplicate address here:		 * If Packet.Random != My.Random => DupAddr.		 */		for (i = 3; i >= 0; i--) {			if (pRPort->Random[i] != pRPacket->Random[i]) {				break;			}		}		/*		 * CAUTION: Do not check for duplicate MAC address in RLMT Alive Reply		 * packets (they have the LLC_COMMAND_RESPONSE_BIT set in		 * pRPacket->SSap).		 */		if (i >= 0 && pRPacket->DSap == SK_RLMT_DSAP &&			pRPacket->Ctrl == SK_RLMT_CTRL &&			pRPacket->SSap == SK_RLMT_SSAP &&			pRPacket->Indicator[0] == SK_RLMT_INDICATOR0 &&			pRPacket->Indicator[1] == SK_RLMT_INDICATOR1 &&			pRPacket->Indicator[2] == SK_RLMT_INDICATOR2 &&			pRPacket->Indicator[3] == SK_RLMT_INDICATOR3 &&			pRPacket->Indicator[4] == SK_RLMT_INDICATOR4 &&			pRPacket->Indicator[5] == SK_RLMT_INDICATOR5 &&			pRPacket->Indicator[6] == SK_RLMT_INDICATOR6) {			SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_RX,				("SkRlmtPacketReceive: Duplicate MAC Address.\n"))			/* Error Log entry. */			SK_ERR_LOG(pAC, SK_ERRCL_COMM, SKERR_RLMT_E006, SKERR_RLMT_E006_MSG);		}		else {			/* Simply trash it. */			SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_RX,				("SkRlmtPacketReceive: Sent by me.\n"))		}		SkDrvFreeRlmtMbuf(pAC, IoC, pMb);		return;	}	/* Check SuspectTx entries. */	if (pRPort->PortsSuspect > 0) {		for (j = 0; j < pRPort->PortsChecked; j++) {			if (pRPort->PortCheck[j].SuspectTx &&				SK_ADDR_EQUAL(					pRPacket->SrcAddr, pRPort->PortCheck[j].CheckAddr.a)) {				pRPort->PortCheck[j].SuspectTx = SK_FALSE;				pRPort->PortsSuspect--;				break;			}		}	}	/* Determine type of packet. */	if (pRPacket->DSap == SK_RLMT_DSAP &&		pRPacket->Ctrl == SK_RLMT_CTRL &&		(pRPacket->SSap & ~LLC_COMMAND_RESPONSE_BIT) == SK_RLMT_SSAP &&		pRPacket->Indicator[0] == SK_RLMT_INDICATOR0 &&		pRPacket->Indicator[1] == SK_RLMT_INDICATOR1 &&		pRPacket->Indicator[2] == SK_RLMT_INDICATOR2 &&		pRPacket->Indicator[3] == SK_RLMT_INDICATOR3 &&		pRPacket->Indicator[4] == SK_RLMT_INDICATOR4 &&		pRPacket->Indicator[5] == SK_RLMT_INDICATOR5 &&		pRPacket->Indicator[6] == SK_RLMT_INDICATOR6) {		/* It's an RLMT packet. */		PacketType = (SK_U16)((pRPacket->RlmtPacketType[0] << 8) |			pRPacket->RlmtPacketType[1]);		switch (PacketType) {		case SK_PACKET_ANNOUNCE:	/* Not yet used. */#if 0			/* Build the check chain. */			SkRlmtBuildCheckChain(pAC);#endif	/* 0 */			SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_RX,				("SkRlmtPacketReceive: Announce.\n"))			SkDrvFreeRlmtMbuf(pAC, IoC, pMb);			break;		case SK_PACKET_ALIVE:			if (pRPacket->SSap & LLC_COMMAND_RESPONSE_BIT) {				SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_RX,					("SkRlmtPacketReceive: Alive Reply.\n"))				if (!(pAC->Addr.Port[PortNumber].PromMode & SK_PROM_MODE_LLC) ||					SK_ADDR_EQUAL(						pRPacket->DstAddr, pAPort->CurrentMacAddress.a)) {					/* Obviously we could send something. */					if (pRPort->CheckingState & SK_RLMT_PCS_TX) {						pRPort->CheckingState &=  ~SK_RLMT_PCS_TX;						SkTimerStop(pAC, IoC, &pRPort->DownTxTimer);					}					if ((pRPort->PortState == SK_RLMT_PS_DOWN) &&						!(pRPort->CheckingState & SK_RLMT_PCS_RX)) {						pRPort->PortState = SK_RLMT_PS_GOING_UP;						pRPort->GuTimeStamp = SkOsGetTime(pAC);						SkTimerStop(pAC, IoC, &pRPort->DownTxTimer);						Para.Para32[0] = PortNumber;						Para.Para32[1] = (SK_U32)-1;						SkTimerStart(pAC, IoC, &pRPort->UpTimer,							SK_RLMT_PORTUP_TIM_VAL, SKGE_RLMT,							SK_RLMT_PORTUP_TIM, Para);					}				}				/* Mark sending port as alive? */				SkDrvFreeRlmtMbuf(pAC, IoC, pMb);			}			else {	/* Alive Request Packet. */				SK_DBG_MSG(pAC, SK_DBGMOD_RLMT, SK_DBGCAT_RX,					("SkRlmtPacketReceive: Alive Request.\n"))				pRPort->RxHelloCts++;				/* Answer. */				for (i = 0; i < SK_MAC_ADDR_LEN; i++) {					pRPacket->DstAddr[i] = pRPacket->SrcAddr[i];					pRPacket->SrcAddr[i] =						pAC->Addr.Port[PortNumber].CurrentMacAddress.a[i];				}				pRPacket->SSap |= LLC_COMMAND_RESPONSE_BIT;				Para.pParaPtr = pMb;				SkEventQueue(pAC, SKGE_DRV, SK_DRV_RLMT_SEND, Para);			}			break;