transmit.c

rstp for switch in vxworks

	register struct net_bridge_port *port = NULL;
	register int port_index, vlan_id;
	unsigned char role;

#ifdef STP_DBG
	if (this->owner.port->skip_tx > 0)
	{
		if (1 == this->owner.port->skip_tx)
			stp_trace ("port %s stop tx skipping", this->owner.port->port_name);
		else
			stp_trace ("port %s skip tx %d", this->owner.port->port_name,
				this->owner.port->skip_tx);

		this->owner.port->skip_tx--;
		return STP_Nothing_To_Do;
	}
#endif

	port = this->owner.port;
	if (port->admin_non_stp)
	{
		return 1;
	}
	port_index = port->port_no;
/*	vlan_id = port->owner->vlan_id;*/

	pkt_len =
		build_bpdu_header (port, BPDU_RSTP,
		sizeof (BPDU_HEADER_T) + sizeof (BPDU_BODY_T) /*+2*/);
	build_config_bpdu (port, False);

	switch (port->selectedRole)
	{
		default:
		case DisabledPort:
			role = RSTP_PORT_ROLE_UNKN;
			break;
		case AlternatePort:
			role = RSTP_PORT_ROLE_ALTBACK;
			break;
		case BackupPort:
			role = RSTP_PORT_ROLE_ALTBACK;
			break;
		case RootPort:
			role = RSTP_PORT_ROLE_ROOT;
			break;
		case DesignatedPort:
			role = RSTP_PORT_ROLE_DESGN;
			break;
	}

	bpdu_packet.body.flags |= (role << PORT_ROLE_OFFS);

	if (port->synced)
	{
#if 0	/* def STP_DBG */
		if (port->roletrns->debug)
			stp_trace ("tx AGREEMENT_BIT to port %s", port->port_name);
#endif
		bpdu_packet.body.flags |= AGREEMENT_BIT;
	}

	if (port->proposing)
	{
#if 0	/* def STP_DBG */
		if (port->roletrns->debug)
			stp_trace ("tx PROPOSAL_BIT to port %s", port->port_name);
#endif
		bpdu_packet.body.flags |= PROPOSAL_BIT;
	}

#ifdef STP_DBG
	if (this->debug)
		stp_trace ("port %s txRstp flags=0X%lx", port->port_name,
			(unsigned long) bpdu_packet.body.flags);
#endif

	return STP_OUT_tx_bpdu (port_index, (unsigned char *) &bpdu_packet,
		pkt_len);
}

/*
  *  Port Transmint 状态机负责在newInfo表明有新的信息存在时，
      用sendRSTP变量所标识的格式发送BPDU。该状态机强制了发送
      BPDU的一个发送率。txCount每发送一个就增加一次。当txCout增
      加到txHoldCount时，就停止发送了。txCount每秒钟被Port Timers 状态
      机确定。从而每秒定一个"信用"，上限为TxHoldCount.

      这个状态机利用了sendRSTP变量(由Port Protocol Migration 状态机管理)
      确定是RST BPDU, Config BPDU,或者TCN BPDU 将被发送,实际发送的信息
      将因为sendRSTP的不同而不同.
          
  */



/************************************************************************************
  函数名称:  
  输入参数:  
  输出参数:  
  功能描述:  Port Transmit 状态机的状态操作函数
  返回值     :
  备注           :  
  作者           :  
  日期           :
  ************************************************************************************/
void STP_transmit_enter_state (STATE_MACH_T * this)
{
	register struct net_bridge_port *port = this->owner.port;


	switch (this->State)
	{
		case BEGIN:
		case TRANSMIT_INIT:

#ifdef _TRANS_DEBUG_			
			printf("TRANSMINT INIT\r\n");			
#endif


			port->newInfo = False;
			port->helloWhen = 0;
			port->txCount = 0;
			break;
		case TRANSMIT_PERIODIC:

		
			#ifdef _TRANS_DEBUG_			
			printf("TRANSMINT PERIODIC\r\n");			
	#endif
			/*port->newInfo则值在此改变。只要下面条件之一为1，
			   则newInfo为真
			    */
			port->newInfo = port->newInfo || ((port->role == DesignatedPort) ||
				((port->role == RootPort) && port->tcWhile));
			port->helloWhen = port->br->rootTimes.HelloTime;
			break;
		case IDLE:
	#ifdef _TRANS_DEBUG_				
			printf("IDLE\r\n");			
		
	#endif		
			break;

		case TRANSMIT_CONFIG:
	#ifdef _TRANS_DEBUG_				
			printf("TRANSMINT CONFIG\r\n");			
		
#endif
			port->newInfo = False;
			txConfig (this);
			port->txCount++;
			port->tcAck = False;
			break;
		case TRANSMIT_TCN:
	#ifdef _TRANS_DEBUG_				
			printf("TRANSMINT TCN\r\n");			
	
#endif
			port->newInfo = False;
			txTcn (this);
			port->txCount++;
			break;
		case TRANSMIT_RSTP:
#ifdef _TRANS_DEBUG_			
			printf("TRANSMINT RSTP,%d\r\n",port->port_no);			
	#endif	

			port->newInfo = False;
			txRstp (this);
			port->txCount++;
			port->tcAck = False;
			break;
	}
}

/************************************************************************************
  函数名称:  STP_transmit_check_conditions
  输入参数:  
  输出参数:  
  功能描述:  Port Transmit 状态机的状态转移函数
  返回值     :
  备注           :  
  作者           :  
  日期           :
  ************************************************************************************/
Bool STP_transmit_check_conditions (STATE_MACH_T * this)
{
	register struct net_bridge_port*port = this->owner.port;

#ifdef _TRANS_DEBUG_			
	printf("\r\nTransmit Check Condition\r\n");			

#endif

	if (BEGIN == this->State)
		return STP_hop_2_state (this, TRANSMIT_INIT);

	switch (this->State)
	{
		case TRANSMIT_INIT:
			port->helloWhen = 0;
			port->txCount = 0;
			port->newInfo = False;
	#ifdef _TRANS_DEBUG_			
			printf("INIT TO IDLE\r\n");			
#endif

			return STP_hop_2_state (this, IDLE);
		case TRANSMIT_PERIODIC:
	#ifdef _TRANS_DEBUG_			
			printf("PERIODIC TO IDLE\r\n");			
#endif
			return STP_hop_2_state (this, IDLE);
		case IDLE:
			if (!port->helloWhen)
			{
				/*17.27
				a)  当helloWhen定时器超期时，转到TRANSMIT_PERIODIC*/
	#ifdef _TRANS_DEBUG_			
				printf("IDLE TO PERIODIC\r\n");			
#endif
				return STP_hop_2_state (this, TRANSMIT_PERIODIC);
			}
			if (!port->sendRSTP && port->newInfo &&
				(port->txCount < TxHoldCount) && (port->role == DesignatedPort)
				&& port->helloWhen)
			{
				/*17.27  
				d)
				满足以下条件，则转到TRANSMIT_CONFIG状态发送
				config BPDU
				1)  端口RSTP为假
				2)  端口newInfo为真
				3)  端口txCount 未到达发BPDU包的最大速率TxHoldCount
				4)  端口的角色是指定端口
				5)  helloWhen非0*/
	#ifdef _TRANS_DEBUG_			
				printf("IDLE TO TRANSMIT_CONFIG\r\n");			
#endif

				return STP_hop_2_state (this, TRANSMIT_CONFIG);
			}
			if (!port->sendRSTP && port->newInfo &&
				(port->txCount < TxHoldCount) && (port->role == RootPort) &&
				port->helloWhen)
			{
				/*17.27	
				c)
				满足以下条件，则转到TRANSMIT_TCN状态发送
				TCN BPDU
				1)  端口的RSTP为假
				2)  端口newInfo为真
				3)  端口txCount比TxHoldCount小
				4)  端口的角色是根端口
				5)  helloWhen非0*/
	#ifdef _TRANS_DEBUG_			
				printf("IDLE TO TRANSMIT_TCN\r\n");			
#endif
				return STP_hop_2_state (this, TRANSMIT_TCN);
			}
			if (port->sendRSTP && port->newInfo && (port->txCount < TxHoldCount)
				&& ((port->role == RootPort) || (port->role == DesignatedPort))
				&& port->helloWhen /*added by wl 03-18 与协议相符和*/
			   )
			{
				/*17.27				
				b)
				满足以下条件，转到TRANSIMIT_RSTP
				1) sendRSTP为真，表示发送格式为RSTP
				2) newInfo为真，表示有一个BPDU包要发送
				3) txCount小于TxHoldCount，未到每秒钟发BPDU包的上限
				4) helloWhen不为0
				5)端口角色是根端口或者指定端口
				*/
		#ifdef _TRANS_DEBUG_			
				printf("IDLE TO TRANSMIT_RSTP\r\n");			
#endif
				return STP_hop_2_state (this, TRANSMIT_RSTP);
			}
			break;
		case TRANSMIT_CONFIG:
			{
				/*发送完数据后恢复到IDLE状态*/
		#ifdef _TRANS_DEBUG_
				printf("TRANSMIT_CONFIG TO IDLE\r\n");			
		#endif
				return STP_hop_2_state (this, IDLE);
			}
		case TRANSMIT_TCN:
			{
				/*发送完数据后恢复到IDLE状态*/
		#ifdef _TRANS_DEBUG_			
				printf("TRANSMIT_TCN TO IDLE\r\n");			

	#endif

				return STP_hop_2_state (this, IDLE);
			}
		case TRANSMIT_RSTP:
			{
				/*发送完数据后恢复到IDLE状态*/
		#ifdef _TRANS_DEBUG_			
				printf("TRANSMIT_RSTP TO IDLE\r\n");			
	
#endif
				return STP_hop_2_state (this, IDLE);
			}
	};
	return False;
}