ipg.c

来自「linux 内核源代码」· C语言 代码 · 共 2,341 行 · 第 1/5 页

		rxfd = sp->rxd + entry;

		if (((rxfd->rfs & __RFS_MASK) != __RFS_MASK) || !skb)
			break;

		/* Get received frame length. */
		framelen = le64_to_cpu(rxfd->rfs) & IPG_RFS_RXFRAMELEN;

		/* Check for jumbo frame arrival with too small
		 * RXFRAG_SIZE.
		 */
		if (framelen > IPG_RXFRAG_SIZE) {
			IPG_DEBUG_MSG
			    ("RFS FrameLen > allocated fragment size.\n");

			framelen = IPG_RXFRAG_SIZE;
		}

		if ((IPG_DROP_ON_RX_ETH_ERRORS && (le64_to_cpu(rxfd->rfs) &
		       (IPG_RFS_RXFIFOOVERRUN | IPG_RFS_RXRUNTFRAME |
			IPG_RFS_RXALIGNMENTERROR | IPG_RFS_RXFCSERROR |
			IPG_RFS_RXOVERSIZEDFRAME | IPG_RFS_RXLENGTHERROR)))) {

			IPG_DEBUG_MSG("Rx error, RFS = %16.16lx\n",
				      (unsigned long int) rxfd->rfs);

			/* Increment general receive error statistic. */
			sp->stats.rx_errors++;

			/* Increment detailed receive error statistics. */
			if (le64_to_cpu(rxfd->rfs) & IPG_RFS_RXFIFOOVERRUN) {
				IPG_DEBUG_MSG("RX FIFO overrun occured.\n");
				sp->stats.rx_fifo_errors++;
			}

			if (le64_to_cpu(rxfd->rfs) & IPG_RFS_RXRUNTFRAME) {
				IPG_DEBUG_MSG("RX runt occured.\n");
				sp->stats.rx_length_errors++;
			}

			if (le64_to_cpu(rxfd->rfs) & IPG_RFS_RXOVERSIZEDFRAME) ;
			/* Do nothing, error count handled by a IPG
			 * statistic register.
			 */

			if (le64_to_cpu(rxfd->rfs) & IPG_RFS_RXALIGNMENTERROR) {
				IPG_DEBUG_MSG("RX alignment error occured.\n");
				sp->stats.rx_frame_errors++;
			}

			if (le64_to_cpu(rxfd->rfs) & IPG_RFS_RXFCSERROR) ;
			/* Do nothing, error count handled by a IPG
			 * statistic register.
			 */

			/* Free the memory associated with the RX
			 * buffer since it is erroneous and we will
			 * not pass it to higher layer processes.
			 */
			if (skb) {
				__le64 info = rxfd->frag_info;

				pci_unmap_single(sp->pdev,
					le64_to_cpu(info) & ~IPG_RFI_FRAGLEN,
					sp->rx_buf_sz, PCI_DMA_FROMDEVICE);

				IPG_DEV_KFREE_SKB(skb);
			}
		} else {

			/* Adjust the new buffer length to accomodate the size
			 * of the received frame.
			 */
			skb_put(skb, framelen);

			/* Set the buffer's protocol field to Ethernet. */
			skb->protocol = eth_type_trans(skb, dev);

			/* If the frame contains an IP/TCP/UDP frame,
			 * determine if upper layer must check IP/TCP/UDP
			 * checksums.
			 *
			 * NOTE: DO NOT RELY ON THE TCP/UDP CHECKSUM
			 *       VERIFICATION FOR SILICON REVISIONS B3
			 *       AND EARLIER!
			 *
			 if ((le64_to_cpu(rxfd->rfs &
			     (IPG_RFS_TCPDETECTED | IPG_RFS_UDPDETECTED |
			      IPG_RFS_IPDETECTED))) &&
			    !(le64_to_cpu(rxfd->rfs &
			      (IPG_RFS_TCPERROR | IPG_RFS_UDPERROR |
			       IPG_RFS_IPERROR)))) {
				 * Indicate IP checksums were performed
				 * by the IPG.
				 *
				skb->ip_summed = CHECKSUM_UNNECESSARY;
			 } else
			 */
			 {
				/* The IPG encountered an error with (or
				 * there were no) IP/TCP/UDP checksums.
				 * This may or may not indicate an invalid
				 * IP/TCP/UDP frame was received. Let the
				 * upper layer decide.
				 */
				skb->ip_summed = CHECKSUM_NONE;
			}

			/* Hand off frame for higher layer processing.
			 * The function netif_rx() releases the sk_buff
			 * when processing completes.
			 */
			netif_rx(skb);

			/* Record frame receive time (jiffies = Linux
			 * kernel current time stamp).
			 */
			dev->last_rx = jiffies;
		}

		/* Assure RX buffer is not reused by IPG. */
		sp->RxBuff[entry] = NULL;
	}

	/*
	 * If there are more RFDs to proces and the allocated amount of RFD
	 * processing time has expired, assert Interrupt Requested to make
	 * sure we come back to process the remaining RFDs.
	 */
	if (i == IPG_MAXRFDPROCESS_COUNT)
		ipg_w32(ipg_r32(ASIC_CTRL) | IPG_AC_INT_REQUEST, ASIC_CTRL);

#ifdef IPG_DEBUG
	/* Check if the RFD list contained no receive frame data. */
	if (!i)
		sp->EmptyRFDListCount++;
#endif
	while ((le64_to_cpu(rxfd->rfs) & IPG_RFS_RFDDONE) &&
	       !((le64_to_cpu(rxfd->rfs) & IPG_RFS_FRAMESTART) &&
		 (le64_to_cpu(rxfd->rfs) & IPG_RFS_FRAMEEND))) {
		unsigned int entry = curr++ % IPG_RFDLIST_LENGTH;

		rxfd = sp->rxd + entry;

		IPG_DEBUG_MSG("Frame requires multiple RFDs.\n");

		/* An unexpected event, additional code needed to handle
		 * properly. So for the time being, just disregard the
		 * frame.
		 */

		/* Free the memory associated with the RX
		 * buffer since it is erroneous and we will
		 * not pass it to higher layer processes.
		 */
		if (sp->RxBuff[entry]) {
			pci_unmap_single(sp->pdev,
				le64_to_cpu(rxfd->frag_info) & ~IPG_RFI_FRAGLEN,
				sp->rx_buf_sz, PCI_DMA_FROMDEVICE);
			IPG_DEV_KFREE_SKB(sp->RxBuff[entry]);
		}

		/* Assure RX buffer is not reused by IPG. */
		sp->RxBuff[entry] = NULL;
	}

	sp->rx_current = curr;

	/* Check to see if there are a minimum number of used
	 * RFDs before restoring any (should improve performance.)
	 */
	if ((curr - sp->rx_dirty) >= IPG_MINUSEDRFDSTOFREE)
		ipg_nic_rxrestore(dev);

	return 0;
}
#endif

static void ipg_reset_after_host_error(struct work_struct *work)
{
	struct ipg_nic_private *sp =
		container_of(work, struct ipg_nic_private, task.work);
	struct net_device *dev = sp->dev;

	IPG_DDEBUG_MSG("DMACtrl = %8.8x\n", ioread32(sp->ioaddr + IPG_DMACTRL));

	/*
	 * Acknowledge HostError interrupt by resetting
	 * IPG DMA and HOST.
	 */
	ipg_reset(dev, IPG_AC_GLOBAL_RESET | IPG_AC_HOST | IPG_AC_DMA);

	init_rfdlist(dev);
	init_tfdlist(dev);

	if (ipg_io_config(dev) < 0) {
		printk(KERN_INFO "%s: Cannot recover from PCI error.\n",
		       dev->name);
		schedule_delayed_work(&sp->task, HZ);
	}
}

static irqreturn_t ipg_interrupt_handler(int irq, void *dev_inst)
{
	struct net_device *dev = dev_inst;
	struct ipg_nic_private *sp = netdev_priv(dev);
	void __iomem *ioaddr = sp->ioaddr;
	unsigned int handled = 0;
	u16 status;

	IPG_DEBUG_MSG("_interrupt_handler\n");

#ifdef JUMBO_FRAME
	ipg_nic_rxrestore(dev);
#endif
	spin_lock(&sp->lock);

	/* Get interrupt source information, and acknowledge
	 * some (i.e. TxDMAComplete, RxDMAComplete, RxEarly,
	 * IntRequested, MacControlFrame, LinkEvent) interrupts
	 * if issued. Also, all IPG interrupts are disabled by
	 * reading IntStatusAck.
	 */
	status = ipg_r16(INT_STATUS_ACK);

	IPG_DEBUG_MSG("IntStatusAck = %4.4x\n", status);

	/* Shared IRQ of remove event. */
	if (!(status & IPG_IS_RSVD_MASK))
		goto out_enable;

	handled = 1;

	if (unlikely(!netif_running(dev)))
		goto out_unlock;

	/* If RFDListEnd interrupt, restore all used RFDs. */
	if (status & IPG_IS_RFD_LIST_END) {
		IPG_DEBUG_MSG("RFDListEnd Interrupt.\n");

		/* The RFD list end indicates an RFD was encountered
		 * with a 0 NextPtr, or with an RFDDone bit set to 1
		 * (indicating the RFD is not read for use by the
		 * IPG.) Try to restore all RFDs.
		 */
		ipg_nic_rxrestore(dev);

#ifdef IPG_DEBUG
		/* Increment the RFDlistendCount counter. */
		sp->RFDlistendCount++;
#endif
	}

	/* If RFDListEnd, RxDMAPriority, RxDMAComplete, or
	 * IntRequested interrupt, process received frames. */
	if ((status & IPG_IS_RX_DMA_PRIORITY) ||
	    (status & IPG_IS_RFD_LIST_END) ||
	    (status & IPG_IS_RX_DMA_COMPLETE) ||
	    (status & IPG_IS_INT_REQUESTED)) {
#ifdef IPG_DEBUG
		/* Increment the RFD list checked counter if interrupted
		 * only to check the RFD list. */
		if (status & (~(IPG_IS_RX_DMA_PRIORITY | IPG_IS_RFD_LIST_END |
				IPG_IS_RX_DMA_COMPLETE | IPG_IS_INT_REQUESTED) &
			       (IPG_IS_HOST_ERROR | IPG_IS_TX_DMA_COMPLETE |
				IPG_IS_LINK_EVENT | IPG_IS_TX_COMPLETE |
				IPG_IS_UPDATE_STATS)))
			sp->RFDListCheckedCount++;
#endif

		ipg_nic_rx(dev);
	}

	/* If TxDMAComplete interrupt, free used TFDs. */
	if (status & IPG_IS_TX_DMA_COMPLETE)
		ipg_nic_txfree(dev);

	/* TxComplete interrupts indicate one of numerous actions.
	 * Determine what action to take based on TXSTATUS register.
	 */
	if (status & IPG_IS_TX_COMPLETE)
		ipg_nic_txcleanup(dev);

	/* If UpdateStats interrupt, update Linux Ethernet statistics */
	if (status & IPG_IS_UPDATE_STATS)
		ipg_nic_get_stats(dev);

	/* If HostError interrupt, reset IPG. */
	if (status & IPG_IS_HOST_ERROR) {
		IPG_DDEBUG_MSG("HostError Interrupt\n");

		schedule_delayed_work(&sp->task, 0);
	}

	/* If LinkEvent interrupt, resolve autonegotiation. */
	if (status & IPG_IS_LINK_EVENT) {
		if (ipg_config_autoneg(dev) < 0)
			printk(KERN_INFO "%s: Auto-negotiation error.\n",
			       dev->name);
	}

	/* If MACCtrlFrame interrupt, do nothing. */
	if (status & IPG_IS_MAC_CTRL_FRAME)
		IPG_DEBUG_MSG("MACCtrlFrame interrupt.\n");

	/* If RxComplete interrupt, do nothing. */
	if (status & IPG_IS_RX_COMPLETE)
		IPG_DEBUG_MSG("RxComplete interrupt.\n");

	/* If RxEarly interrupt, do nothing. */
	if (status & IPG_IS_RX_EARLY)
		IPG_DEBUG_MSG("RxEarly interrupt.\n");

out_enable:
	/* Re-enable IPG interrupts. */
	ipg_w16(IPG_IE_TX_DMA_COMPLETE | IPG_IE_RX_DMA_COMPLETE |
		IPG_IE_HOST_ERROR | IPG_IE_INT_REQUESTED | IPG_IE_TX_COMPLETE |
		IPG_IE_LINK_EVENT | IPG_IE_UPDATE_STATS, INT_ENABLE);
out_unlock:
	spin_unlock(&sp->lock);

	return IRQ_RETVAL(handled);
}

static void ipg_rx_clear(struct ipg_nic_private *sp)
{
	unsigned int i;

	for (i = 0; i < IPG_RFDLIST_LENGTH; i++) {
		if (sp->RxBuff[i]) {
			struct ipg_rx *rxfd = sp->rxd + i;

			IPG_DEV_KFREE_SKB(sp->RxBuff[i]);
			sp->RxBuff[i] = NULL;
			pci_unmap_single(sp->pdev,
				le64_to_cpu(rxfd->frag_info) & ~IPG_RFI_FRAGLEN,
				sp->rx_buf_sz, PCI_DMA_FROMDEVICE);
		}
	}
}

static void ipg_tx_clear(struct ipg_nic_private *sp)
{
	unsigned int i;

	for (i = 0; i < IPG_TFDLIST_LENGTH; i++) {
		if (sp->TxBuff[i]) {
			struct ipg_tx *txfd = sp->txd + i;

			pci_unmap_single(sp->pdev,
				le64_to_cpu(txfd->frag_info) & ~IPG_TFI_FRAGLEN,
				sp->TxBuff[i]->len, PCI_DMA_TODEVICE);

			IPG_DEV_KFREE_SKB(sp->TxBuff[i]);

			sp->TxBuff[i] = NULL;
		}
	}
}

static int ipg_nic_open(struct net_device *dev)
{
	struct ipg_nic_private *sp = netdev_priv(dev);
	void __iomem *ioaddr = sp->ioaddr;
	struct pci_dev *pdev = sp->pdev;
	int rc;

	IPG_DEBUG_MSG("_nic_open\n");

	sp->rx_buf_sz = IPG_RXSUPPORT_SIZE;

	/* Check for interrupt line conflicts, and request interrupt
	 * line for IPG.
	 *
	 * IMPORTANT: Disable IPG interrupts prior to registering
	 *            IRQ.
	 */
	ipg_w16(0x0000, INT_ENABLE);

	/* Register the interrupt line to be used by the IPG within
	 * the Linux system.
	 */
	rc = request_irq(pdev->irq, &ipg_interrupt_handler, IRQF_SHARED,
			 dev->name, dev);
	if (rc < 0) {
		printk(KERN_INFO "%s: Error when requesting interrupt.\n",
		       dev->name);
		goto out;
	}

	dev->irq = pdev->irq;

	rc = -ENOMEM;

	sp->rxd = dma_alloc_coherent(&pdev->dev, IPG_RX_RING_BYTES,
				     &sp->rxd_map, GFP_KERNEL);
	if (!sp->rxd)
		goto err_free_irq_0;

	sp->txd = dma_alloc_coherent(&pdev->dev, IPG_TX_RING_BYTES,
				     &sp->txd_map, GFP_KERNEL);
	if (!sp->txd)
		goto err_free_rx_1;

	rc = init_rfdlist(dev);
	if (rc < 0) {
		printk(KERN_INFO "%s: Error during configuration.\n",
		       dev->name);
		goto err_free_tx_2;
	}

	init_tfdlist(dev);

	rc = ipg_io_config(dev);
	if (rc < 0) {
		printk(KERN_INFO "%s: Error during configuration.\n",
		       dev->name);
		goto err_release_tfdlist_3;
	}

	/* Resolve autonegotiation. */
	if (ipg_config_autoneg(dev) < 0)
		printk(KERN_INFO "%s: Auto-negotiation error.\n", dev->name);

#ifdef JUMBO_FRAME
	/* initialize JUMBO Frame control variable */
	sp->Jumbo.FoundStart = 0;
	sp->Jumbo.CurrentSize = 0;
	sp->Jumbo.skb = 0;
	dev->mtu = IPG_TXFRAG_SIZE;
#endif

	/* Enable transmit and receive operation of the IPG. */
	ipg_w32((ipg_r32(MAC_CTRL) | IPG_MC_RX_ENABLE | IPG_MC_TX_ENABLE) &
		 IPG_MC_RSVD_MASK, MAC_CTRL);

	netif_start_queue(dev);
out:
	return rc;

err_release_tfdlist_3:
	ipg_tx_clear(sp);
	ipg_rx_clear(sp);
err_free_tx_2:
	dma_free_coherent(&pdev->dev, IPG_TX_RING_BYTES, sp->txd, sp->txd_map);
err_free_rx_1:
	dma_free_coherent(&pdev->dev, IPG_RX_RING_BYTES, sp->rxd, sp->rxd_map);
err_free_irq_0:
	free_irq(pdev->irq, dev);
	goto out;
}

static int ipg_nic_stop(struct net_device *dev)
{
	struct ipg_nic_private *sp = netdev_priv(dev);
	void __iomem *ioaddr = sp->ioaddr;
	struct pci_dev *pdev = sp->pdev;

	IPG_DEBUG_MSG("_nic_stop\n");

	netif_stop_queue(dev);

	IPG_DDEBUG_MSG("RFDlistendCount = %i\n", sp->RFDlistendCount);
	IPG_DDEBUG_MSG("RFDListCheckedCount = %i\n", sp->rxdCheckedCount);
	IPG_DDEBUG_MSG("EmptyRFDListCount = %i\n", sp->EmptyRFDListCount);
	IPG_DUMPTFDLIST(dev);

	do {