dev_c7200_pos.c

思科路由器仿真器,用来仿7200系列得,可以在电脑上模拟路由器-Cisco router simulator, used to fake a 7200 series can be simulated

   int i;

   if (d->rx_start == 0)
      return;

   /* Truncate the packet if it is too big */
   pkt_len = m_min(pkt_len,POS_OC3_MAX_PKT_SIZE);

   /* Copy the current rxring descriptor */
   rxdesc_read(d,d->rx_current,&rxd0);
   
   /* We must have the first descriptor... */
   if (!rxdesc_acquire(rxd0.rdes[0]))
      return;

   /* Remember the first RX descriptor address */
   rx_start = d->rx_current;

   for(i=0,rxdc=&rxd0;tot_len>0;i++)
   {
      /* Put data into the descriptor buffers */
      cp_len = rxdesc_put_pkt(d,rxdc,&pkt_ptr,&tot_len);

      /* Get address of the next descriptor */
      rxdn_addr = rxdesc_get_next(d,d->rx_current,rxdc);

      /* We have finished if the complete packet has been stored */
      if (tot_len == 0) {
         rxdc->rdes[0] = cp_len + 4;

         if (i != 0)
            physmem_copy_u32_to_vm(d->vm,d->rx_current,rxdc->rdes[0]);

         d->rx_current = rxdn_addr;
         break;
      }

#if DEBUG_RECEIVE
      POS_LOG(d,"trying to acquire new descriptor at 0x%x\n",rxdn_addr);
#endif
      /* Get status of the next descriptor to see if we can acquire it */
      rxdn_rdes0 = physmem_copy_u32_from_vm(d->vm,rxdn_addr);

      if (!rxdesc_acquire(rxdn_rdes0))
         rxdc->rdes[0] = 0;  /* error, no buf available (special flag?) */
      else
         rxdc->rdes[0] = POS_OC3_RXDESC_CONT;  /* packet continues */

      rxdc->rdes[0] |= cp_len;

      /* Update the new status (only if we are not on the first desc) */
      if (i != 0)
         physmem_copy_u32_to_vm(d->vm,d->rx_current,rxdc->rdes[0]);

      /* Update the RX pointer */
      d->rx_current = rxdn_addr;

      if (!(rxdc->rdes[0] & POS_OC3_RXDESC_CONT))
         break;

      /* Read the next descriptor from VM physical RAM */
      rxdesc_read(d,rxdn_addr,&rxdn);
      rxdc = &rxdn;
   }

   /* Update the first RX descriptor */
   physmem_copy_u32_to_vm(d->vm,rx_start,rxd0.rdes[0]);

   /* Generate IRQ on CPU */
   pci_dev_trigger_irq(d->vm,d->pci_dev);
}

/* Handle the RX ring */
static int dev_pos_oc3_handle_rxring(netio_desc_t *nio,
                                     u_char *pkt,ssize_t pkt_len,
                                     struct pos_oc3_data *d)
{
#if DEBUG_RECEIVE
   POS_LOG(d,"receiving a packet of %d bytes\n",pkt_len);
   mem_dump(log_file,pkt,pkt_len);
#endif

   dev_pos_oc3_receive_pkt(d,pkt,pkt_len);
   return(TRUE);
}

/* Read a TX descriptor */
static void txdesc_read(struct pos_oc3_data *d,m_uint32_t txd_addr,
                        struct tx_desc *txd)
{
   /* get the next descriptor from VM physical RAM */
   physmem_copy_from_vm(d->vm,txd,txd_addr,sizeof(struct tx_desc));

   /* byte-swapping */
   txd->tdes[0] = vmtoh32(txd->tdes[0]);
   txd->tdes[1] = vmtoh32(txd->tdes[1]);
}

/* Set the address of the next TX descriptor */
static void txdesc_set_next(struct pos_oc3_data *d,struct tx_desc *txd)
{
   if (txd->tdes[0] & POS_OC3_TXDESC_WRAP)
      d->tx_current = d->tx_start;
   else
      d->tx_current += sizeof(struct tx_desc);
}

/* Handle the TX ring */
static int dev_pos_oc3_handle_txring(struct pos_oc3_data *d)
{
   u_char pkt[POS_OC3_MAX_PKT_SIZE],*pkt_ptr;
   m_uint32_t tx_start,clen,tot_len,addr;
   struct tx_desc txd0,ctxd,*ptxd;
   int i,done = FALSE;

   if ((d->tx_start == 0) || (d->nio == NULL))
      return(FALSE);

   /* Copy the current txring descriptor */
   tx_start = d->tx_current;   
   ptxd = &txd0;
   txdesc_read(d,d->tx_current,ptxd);

   /* If we don't own the descriptor, we cannot transmit */
   if (!(txd0.tdes[0] & POS_OC3_TXDESC_OWN))
      return(FALSE);

#if DEBUG_TRANSMIT
   POS_LOG(d,"pos_oc3_handle_txring: 1st desc: tdes[0]=0x%x, tdes[1]=0x%x\n",
           ptxd->tdes[0],ptxd->tdes[1]);
#endif

   pkt_ptr = pkt;
   tot_len = 0;
   i = 0;

   do {
#if DEBUG_TRANSMIT
      POS_LOG(d,"pos_oc3_handle_txring: loop: tdes[0]=0x%x, tdes[1]=0x%x\n",
              ptxd->tdes[0],ptxd->tdes[1]);
#endif

      if (!(ptxd->tdes[0] & POS_OC3_TXDESC_OWN)) {
         POS_LOG(d,"pos_oc3_handle_txring: descriptor not owned!\n");
         return(FALSE);
      }

      clen = ptxd->tdes[0] & POS_OC3_TXDESC_LEN_MASK;

      /* Be sure that we have length not null */
      if (clen != 0) {
         addr = ptxd->tdes[1];

         /* ugly hack, to allow this to work with SRAM platforms */
         if ((addr & ~POS_OC3_TXDESC_ADDR_MASK) == 0xc0000000)
            addr = ptxd->tdes[1] & POS_OC3_TXDESC_ADDR_MASK;

         physmem_copy_from_vm(d->vm,pkt_ptr,addr,clen);
      }

      pkt_ptr += clen;
      tot_len += clen;

      /* Clear the OWN bit if this is not the first descriptor */
      if (i != 0)
         physmem_copy_u32_to_vm(d->vm,d->tx_current,0);

      /* Go to the next descriptor */
      txdesc_set_next(d,ptxd);

      /* Copy the next txring descriptor */
      if (ptxd->tdes[0] & POS_OC3_TXDESC_CONT) {
         txdesc_read(d,d->tx_current,&ctxd);
         ptxd = &ctxd;
         i++;
      } else
         done = TRUE;
   }while(!done);

   if (tot_len != 0) {
#if DEBUG_TRANSMIT
      POS_LOG(d,"sending packet of %u bytes (flags=0x%4.4x)\n",
              tot_len,txd0.tdes[0]);
      mem_dump(log_file,pkt,tot_len);
#endif   
      /* send it on wire */
      netio_send(d->nio,pkt,tot_len);
   }

   /* Clear the OWN flag of the first descriptor */
   txd0.tdes[0] &= ~POS_OC3_TXDESC_OWN;
   physmem_copy_u32_to_vm(d->vm,tx_start,txd0.tdes[0]);

   /* Interrupt on completion */
   pci_dev_trigger_irq(d->vm,d->pci_dev);
   return(TRUE);
}

/*
 * pci_pos_read()
 */
static m_uint32_t pci_pos_read(cpu_mips_t *cpu,struct pci_device *dev,int reg)
{
   struct pos_oc3_data *d = dev->priv_data;

#if DEBUG_ACCESS
   POS_LOG(d,"read PCI register 0x%x\n",reg);
#endif

   switch(reg) {
      case PCI_REG_BAR0:
         return(d->dev.phys_addr);
      default:
         return(0);
   }
}

/*
 * pci_pos_write()
 */
static void pci_pos_write(cpu_mips_t *cpu,struct pci_device *dev,
                          int reg,m_uint32_t value)
{
   struct pos_oc3_data *d = dev->priv_data;

#if DEBUG_ACCESS
   POS_LOG(d,"write 0x%x to PCI register 0x%x\n",value,reg);
#endif

   switch(reg) {
      case PCI_REG_BAR0:
         vm_map_device(cpu->vm,&d->dev,(m_uint64_t)value);
         POS_LOG(d,"registers are mapped at 0x%x\n",value);
         break;
   }
}

/*
 * dev_c7200_pa_pos_init()
 *
 * Add a PA-POS port adapter into specified slot.
 */
int dev_c7200_pa_pos_init(c7200_t *router,char *name,u_int pa_bay)
{
   struct pci_bus *pci_bus;
   struct pos_oc3_data *d;

   /* Allocate the private data structure for PA-POS-OC3 chip */
   if (!(d = malloc(sizeof(*d)))) {
      fprintf(stderr,"%s (PA-POS-OC3): out of memory\n",name);
      return(-1);
   }

   memset(d,0,sizeof(*d));
   d->name = name;
   d->vm   = router->vm;

   /* Set the EEPROM */
   c7200_pa_set_eeprom(router,pa_bay,cisco_eeprom_find_pa("PA-POS-OC3"));

   /* Get the appropriate PCI bus */
   pci_bus = router->pa_bay[pa_bay].pci_map;

   /* Initialize RX device */
   d->rx_name = dyn_sprintf("%s_RX",name);
   dev_init(&d->rx_dev);
   d->rx_dev.name      = d->rx_name;
   d->rx_dev.priv_data = d;
   d->rx_dev.handler   = dev_pos_rx_access;

   /* Initialize TX device */
   d->tx_name = dyn_sprintf("%s_TX",name);
   dev_init(&d->tx_dev);
   d->tx_dev.name      = d->tx_name;
   d->tx_dev.priv_data = d;
   d->tx_dev.handler   = dev_pos_tx_access;

   /* Initialize CS device */
   d->cs_name = dyn_sprintf("%s_CS",name);
   dev_init(&d->cs_dev);
   d->cs_dev.name      = d->cs_name;
   d->cs_dev.priv_data = d;
   d->cs_dev.handler   = dev_pos_cs_access;

   /* Initialize PLX9060 for RX part */
   d->rx_obj = dev_plx9060_init(d->vm,d->rx_name,pci_bus,0,&d->rx_dev);

   /* Initialize PLX9060 for TX part */
   d->tx_obj = dev_plx9060_init(d->vm,d->tx_name,pci_bus,1,&d->tx_dev);

   /* Initialize PLX9060 for CS part (CS=card status, chip status, ... ?) */
   d->cs_obj = dev_plx9060_init(d->vm,d->cs_name,pci_bus,2,&d->cs_dev);

   /* Unknown PCI device here (will be mapped at 0x30000) */
   dev_init(&d->dev);
   d->dev.name      = name;
   d->dev.priv_data = d;
   d->dev.phys_len  = 0x10000;
   d->dev.handler   = dev_pos_access;

   d->pci_dev = pci_dev_add(pci_bus,name,0,0,3,0,C7200_NETIO_IRQ,
                            d,NULL,pci_pos_read,pci_pos_write);

   /* Store device info into the router structure */
   return(c7200_pa_set_drvinfo(router,pa_bay,d));
}

/* Remove a PA-POS-OC3 from the specified slot */
int dev_c7200_pa_pos_shutdown(c7200_t *router,u_int pa_bay)
{
   struct c7200_pa_bay *bay;
   struct pos_oc3_data *d;

   if (!(bay = c7200_pa_get_info(router,pa_bay)))
      return(-1);

   d = bay->drv_info;

   /* Remove the PA EEPROM */
   c7200_pa_unset_eeprom(router,pa_bay);

   /* Remove the PCI device */
   pci_dev_remove(d->pci_dev);

   /* Remove the PLX9060 chips */
   vm_object_remove(d->vm,d->rx_obj);
   vm_object_remove(d->vm,d->tx_obj);
   vm_object_remove(d->vm,d->cs_obj);

   /* Remove the devices from the CPU address space */
   vm_unbind_device(router->vm,&d->rx_dev);
   vm_unbind_device(router->vm,&d->tx_dev);
   vm_unbind_device(router->vm,&d->cs_dev);

   vm_unbind_device(router->vm,&d->dev);
   cpu_group_rebuild_mts(router->vm->cpu_group);

   /* Free the device structure itself */
   free(d);
   return(0);
}

/* Bind a Network IO descriptor to a specific port */
int dev_c7200_pa_pos_set_nio(c7200_t *router,u_int pa_bay,u_int port_id,
                             netio_desc_t *nio)
{
   struct pos_oc3_data *d;

   if ((port_id > 0) || !(d = c7200_pa_get_drvinfo(router,pa_bay)))
      return(-1);

   if (d->nio != NULL)
      return(-1);

   d->nio = nio;
   d->tx_tid = ptask_add((ptask_callback)dev_pos_oc3_handle_txring,d,NULL);
   netio_rxl_add(nio,(netio_rx_handler_t)dev_pos_oc3_handle_rxring,d,NULL);
   return(0);
}

/* Bind a Network IO descriptor to a specific port */
int dev_c7200_pa_pos_unset_nio(c7200_t *router,u_int pa_bay,u_int port_id)
{
   struct pos_oc3_data *d;

   if ((port_id > 0) || !(d = c7200_pa_get_drvinfo(router,pa_bay)))
      return(-1);

   if (d->nio) {
      ptask_remove(d->tx_tid);
      netio_rxl_remove(d->nio);
      d->nio = NULL;
   }
   return(0);
}

/* PA-POS-OC3 driver */
struct c7200_pa_driver dev_c7200_pa_pos_oc3_driver = {
   "PA-POS-OC3", 1, 
   dev_c7200_pa_pos_init,
   dev_c7200_pa_pos_shutdown,
   dev_c7200_pa_pos_set_nio,
   dev_c7200_pa_pos_unset_nio,
   NULL,
};