Add NetXen 1G/10G ethernet driver.

Signed-off-by: Amit S. Kale <amitkale@netxen.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 1116 insertions, 0 deletions

diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
new file mode 100644
index 000000000000..b54ea164e0ea
--- /dev/null
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -0,0 +1,1116 @@
+/*
+ * Copyright (C) 2003 - 2006 NetXen, Inc.
+ * All rights reserved.
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *                            
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *                                   
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ * 
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.
+ * 
+ * Contact Information:
+ *    info@netxen.com
+ * NetXen,
+ * 3965 Freedom Circle, Fourth floor,
+ * Santa Clara, CA 95054
+ *
+ *
+ *  Main source file for NetXen NIC Driver on Linux
+ *
+ */
+
+#include "netxen_nic_hw.h"
+
+#include "netxen_nic.h"
+#define DEFINE_GLOBAL_RECV_CRB
+#include "netxen_nic_phan_reg.h"
+#include "netxen_nic_ioctl.h"
+
+MODULE_DESCRIPTION("NetXen Multi port (1/10) Gigabit Network Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(NETXEN_NIC_LINUX_VERSIONID);
+
+char netxen_nic_driver_name[] = "netxen";
+static char netxen_nic_driver_string[] = "NetXen Network Driver version "
+    NETXEN_NIC_LINUX_VERSIONID "-" NETXEN_NIC_BUILD_NO;
+
+#define NETXEN_NETDEV_WEIGHT 120
+#define NETXEN_ADAPTER_UP_MAGIC 777
+
+/* Local functions to NetXen NIC driver */
+static int __devinit netxen_nic_probe(struct pci_dev *pdev,
+				      const struct pci_device_id *ent);
+static void __devexit netxen_nic_remove(struct pci_dev *pdev);
+static int netxen_nic_open(struct net_device *netdev);
+static int netxen_nic_close(struct net_device *netdev);
+static int netxen_nic_xmit_frame(struct sk_buff *, struct net_device *);
+static void netxen_tx_timeout(struct net_device *netdev);
+static void netxen_tx_timeout_task(struct net_device *netdev);
+static void netxen_watchdog(unsigned long);
+static int netxen_handle_int(struct netxen_adapter *, struct net_device *);
+static int netxen_nic_ioctl(struct net_device *netdev,
+			    struct ifreq *ifr, int cmd);
+static int netxen_nic_poll(struct net_device *dev, int *budget);
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void netxen_nic_poll_controller(struct net_device *netdev);
+#endif
+static irqreturn_t netxen_intr(int irq, void *data, struct pt_regs *regs);
+
+/*  PCI Device ID Table  */
+static struct pci_device_id netxen_pci_tbl[] __devinitdata = {
+	{PCI_DEVICE(0x4040, 0x0001)},
+	{PCI_DEVICE(0x4040, 0x0002)},
+	{PCI_DEVICE(0x4040, 0x0003)},
+	{PCI_DEVICE(0x4040, 0x0004)},
+	{PCI_DEVICE(0x4040, 0x0005)},
+	{0,}
+};
+
+MODULE_DEVICE_TABLE(pci, netxen_pci_tbl);
+
+/*
+ * netxen_nic_probe()
+ *
+ * The Linux system will invoke this after identifying the vendor ID and
+ * device Id in the pci_tbl supported by this module.
+ *
+ * A quad port card has one operational PCI config space, (function 0),
+ * which is used to access all four ports.
+ *
+ * This routine will initialize the adapter, and setup the global parameters
+ * along with the port's specific structure.
+ */
+static int __devinit
+netxen_nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct net_device *netdev = NULL;
+	struct netxen_adapter *adapter = NULL;
+	struct netxen_port *port = NULL;
+	u8 __iomem *mem_ptr = NULL;
+	unsigned long mem_base, mem_len;
+	int pci_using_dac, i, err;
+	int ring;
+	struct netxen_recv_context *recv_ctx = NULL;
+	struct netxen_rcv_desc_ctx *rcv_desc = NULL;
+	struct netxen_cmd_buffer *cmd_buf_arr = NULL;
+	u64 mac_addr[FLASH_NUM_PORTS + 1];
+	int valid_mac;
+
+	if ((err = pci_enable_device(pdev)))
+		return err;
+	if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
+		err = -ENODEV;
+		goto err_out_disable_pdev;
+	}
+
+	if ((err = pci_request_regions(pdev, netxen_nic_driver_name)))
+		goto err_out_disable_pdev;
+
+	pci_set_master(pdev);
+	if ((pci_set_dma_mask(pdev, DMA_64BIT_MASK) == 0) &&
+	    (pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK) == 0))
+		pci_using_dac = 1;
+	else {
+		if ((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
+		    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK)))
+			goto err_out_free_res;
+
+		pci_using_dac = 0;
+	}
+
+	/* remap phys address */
+	mem_base = pci_resource_start(pdev, 0);	/* 0 is for BAR 0 */
+	mem_len = pci_resource_len(pdev, 0);
+
+	/* 128 Meg of memory */
+	mem_ptr = ioremap(mem_base, NETXEN_PCI_MAPSIZE_BYTES);
+	if (mem_ptr == 0UL) {
+		printk(KERN_ERR "%s: Cannot ioremap adapter memory aborting."
+		       ":%p\n", netxen_nic_driver_name, mem_ptr);
+		err = -EIO;
+		goto err_out_free_res;
+	}
+
+/*
+ *      Allocate a adapter structure which will manage all the initialization
+ *      as well as the common resources for all ports...
+ *      all the ports will have pointer to this adapter as well as Adapter
+ *      will have pointers of all the ports structures.
+ */
+
+	/* One adapter structure for all 4 ports....   */
+	adapter = kzalloc(sizeof(struct netxen_adapter), GFP_KERNEL);
+	if (adapter == NULL) {
+		printk(KERN_ERR "%s: Could not allocate adapter memory:%d\n",
+		       netxen_nic_driver_name,
+		       (int)sizeof(struct netxen_adapter));
+		err = -ENOMEM;
+		goto err_out_iounmap;
+	}
+
+	adapter->max_tx_desc_count = MAX_CMD_DESCRIPTORS;
+	adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS;
+	adapter->max_jumbo_rx_desc_count = MAX_JUMBO_RCV_DESCRIPTORS;
+
+	pci_set_drvdata(pdev, adapter);
+
+	cmd_buf_arr = (struct netxen_cmd_buffer *)vmalloc(TX_RINGSIZE);
+	if (cmd_buf_arr == NULL) {
+		err = -ENOMEM;
+		goto err_out_free_adapter;
+	}
+	memset(cmd_buf_arr, 0, TX_RINGSIZE);
+
+	for (i = 0; i < MAX_RCV_CTX; ++i) {
+		recv_ctx = &adapter->recv_ctx[i];
+		for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
+			rcv_desc = &recv_ctx->rcv_desc[ring];
+			switch (RCV_DESC_TYPE(ring)) {
+			case RCV_DESC_NORMAL:
+				rcv_desc->max_rx_desc_count =
+				    adapter->max_rx_desc_count;
+				rcv_desc->flags = RCV_DESC_NORMAL;
+				rcv_desc->dma_size = RX_DMA_MAP_LEN;
+				rcv_desc->skb_size = MAX_RX_BUFFER_LENGTH;
+				break;
+
+			case RCV_DESC_JUMBO:
+				rcv_desc->max_rx_desc_count =
+				    adapter->max_jumbo_rx_desc_count;
+				rcv_desc->flags = RCV_DESC_JUMBO;
+				rcv_desc->dma_size = RX_JUMBO_DMA_MAP_LEN;
+				rcv_desc->skb_size = MAX_RX_JUMBO_BUFFER_LENGTH;
+				break;
+
+			}
+			rcv_desc->rx_buf_arr = (struct netxen_rx_buffer *)
+			    vmalloc(RCV_BUFFSIZE);
+
+			if (rcv_desc->rx_buf_arr == NULL) {
+				err = -ENOMEM;
+				goto err_out_free_rx_buffer;
+			}
+			memset(rcv_desc->rx_buf_arr, 0, RCV_BUFFSIZE);
+		}
+
+	}
+
+	adapter->ops = kzalloc(sizeof(struct netxen_drvops), GFP_KERNEL);
+	if (adapter->ops == NULL) {
+		printk(KERN_ERR
+		       "%s: Could not allocate memory for adapter->ops:%d\n",
+		       netxen_nic_driver_name,
+		       (int)sizeof(struct netxen_adapter));
+		err = -ENOMEM;
+		goto err_out_free_rx_buffer;
+	}
+
+	adapter->cmd_buf_arr = cmd_buf_arr;
+	adapter->ahw.pci_base = mem_ptr;
+	spin_lock_init(&adapter->tx_lock);
+	spin_lock_init(&adapter->lock);
+	/* initialize the buffers in adapter */
+	netxen_initialize_adapter_sw(adapter);
+	/*
+	 * Set the CRB window to invalid. If any register in window 0 is
+	 * accessed it should set the window to 0 and then reset it to 1.
+	 */
+	adapter->curr_window = 255;
+	/*
+	 *  Adapter in our case is quad port so initialize it before
+	 *  initializing the ports
+	 */
+	netxen_initialize_adapter_hw(adapter);	/* initialize the adapter */
+
+	netxen_initialize_adapter_ops(adapter);
+
+	init_timer(&adapter->watchdog_timer);
+	adapter->ahw.xg_linkup = 0;
+	adapter->watchdog_timer.function = &netxen_watchdog;
+	adapter->watchdog_timer.data = (unsigned long)adapter;
+	INIT_WORK(&adapter->watchdog_task,
+		  (void (*)(void *))netxen_watchdog_task, adapter);
+	adapter->ahw.pdev = pdev;
+	adapter->proc_cmd_buf_counter = 0;
+	pci_read_config_byte(pdev, PCI_REVISION_ID, &adapter->ahw.revision_id);
+
+	if (pci_enable_msi(pdev)) {
+		adapter->flags &= ~NETXEN_NIC_MSI_ENABLED;
+		printk(KERN_WARNING "%s: unable to allocate MSI interrupt"
+		       " error\n", netxen_nic_driver_name);
+	} else
+		adapter->flags |= NETXEN_NIC_MSI_ENABLED;
+
+	if (netxen_is_flash_supported(adapter) == 0 &&
+	    netxen_get_flash_mac_addr(adapter, mac_addr) == 0)
+		valid_mac = 1;
+	else
+		valid_mac = 0;
+
+	/* initialize the all the ports */
+
+	for (i = 0; i < adapter->ahw.max_ports; i++) {
+		netdev = alloc_etherdev(sizeof(struct netxen_port));
+		if (!netdev) {
+			printk(KERN_ERR "%s: could not allocate netdev for port"
+			       " %d\n", netxen_nic_driver_name, i + 1);
+			goto err_out_free_dev;
+		}
+
+		SET_MODULE_OWNER(netdev);
+
+		port = netdev_priv(netdev);
+		port->netdev = netdev;
+		port->pdev = pdev;
+		port->adapter = adapter;
+		port->portnum = i;	/* Gigabit port number from 0-3 */
+
+		netdev->open = netxen_nic_open;
+		netdev->stop = netxen_nic_close;
+		netdev->hard_start_xmit = netxen_nic_xmit_frame;
+		netdev->get_stats = netxen_nic_get_stats;
+		netdev->set_multicast_list = netxen_nic_set_multi;
+		netdev->set_mac_address = netxen_nic_set_mac;
+		netdev->change_mtu = netxen_nic_change_mtu;
+		netdev->do_ioctl = netxen_nic_ioctl;
+		netdev->tx_timeout = netxen_tx_timeout;
+		netdev->watchdog_timeo = HZ;
+
+		SET_ETHTOOL_OPS(netdev, &netxen_nic_ethtool_ops);
+		netdev->poll = netxen_nic_poll;
+		netdev->weight = NETXEN_NETDEV_WEIGHT;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+		netdev->poll_controller = netxen_nic_poll_controller;
+#endif
+		/* ScatterGather support */
+		netdev->features = NETIF_F_SG;
+		netdev->features |= NETIF_F_IP_CSUM;
+		netdev->features |= NETIF_F_TSO;
+
+		if (pci_using_dac)
+			netdev->features |= NETIF_F_HIGHDMA;
+
+		if (valid_mac) {
+			unsigned char *p = (unsigned char *)&mac_addr[i];
+			netdev->dev_addr[0] = *(p + 5);
+			netdev->dev_addr[1] = *(p + 4);
+			netdev->dev_addr[2] = *(p + 3);
+			netdev->dev_addr[3] = *(p + 2);
+			netdev->dev_addr[4] = *(p + 1);
+			netdev->dev_addr[5] = *(p + 0);
+
+			memcpy(netdev->perm_addr, netdev->dev_addr,
+			       netdev->addr_len);
+			if (!is_valid_ether_addr(netdev->perm_addr)) {
+				printk(KERN_ERR "%s: Bad MAC address "
+				       "%02x:%02x:%02x:%02x:%02x:%02x.\n",
+				       netxen_nic_driver_name,
+				       netdev->dev_addr[0],
+				       netdev->dev_addr[1],
+				       netdev->dev_addr[2],
+				       netdev->dev_addr[3],
+				       netdev->dev_addr[4],
+				       netdev->dev_addr[5]);
+			} else {
+				if (adapter->ops->macaddr_set)
+					adapter->ops->macaddr_set(port,
+								  netdev->
+								  dev_addr);
+			}
+		}
+		INIT_WORK(&adapter->tx_timeout_task,
+			  (void (*)(void *))netxen_tx_timeout_task, netdev);
+		netif_carrier_off(netdev);
+		netif_stop_queue(netdev);
+
+		if ((err = register_netdev(netdev))) {
+			printk(KERN_ERR "%s: register_netdev failed port #%d"
+			       " aborting\n", netxen_nic_driver_name, i + 1);
+			err = -EIO;
+			free_netdev(netdev);
+			goto err_out_free_dev;
+		}
+		adapter->port_count++;
+		adapter->active_ports = 0;
+		adapter->port[i] = port;
+	}
+
+	/*
+	 * Initialize all the CRB registers here.
+	 */
+	/* Window = 1 */
+	writel(0, NETXEN_CRB_NORMALIZE(adapter, CRB_CMD_PRODUCER_OFFSET));
+	writel(0, NETXEN_CRB_NORMALIZE(adapter, CRB_CMD_CONSUMER_OFFSET));
+	writel(0, NETXEN_CRB_NORMALIZE(adapter, CRB_HOST_CMD_ADDR_LO));
+
+	netxen_phantom_init(adapter);
+	/*
+	 * delay a while to ensure that the Pegs are up & running.
+	 * Otherwise, we might see some flaky behaviour.
+	 */
+	udelay(100);
+
+	switch (adapter->ahw.board_type) {
+	case NETXEN_NIC_GBE:
+		printk("%s: QUAD GbE board initialized\n",
+		       netxen_nic_driver_name);
+		break;
+
+	case NETXEN_NIC_XGBE:
+		printk("%s: XGbE board initialized\n", netxen_nic_driver_name);
+		break;
+	}
+
+	adapter->driver_mismatch = 0;
+
+	return 0;
+
+      err_out_free_dev:
+	if (adapter->flags & NETXEN_NIC_MSI_ENABLED)
+		pci_disable_msi(pdev);
+	for (i = 0; i < adapter->port_count; i++) {
+		port = adapter->port[i];
+		if ((port) && (port->netdev)) {
+			unregister_netdev(port->netdev);
+			free_netdev(port->netdev);
+		}
+	}
+	kfree(adapter->ops);
+
+      err_out_free_rx_buffer:
+	for (i = 0; i < MAX_RCV_CTX; ++i) {
+		recv_ctx = &adapter->recv_ctx[i];
+		for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
+			rcv_desc = &recv_ctx->rcv_desc[ring];
+			if (rcv_desc->rx_buf_arr != NULL) {
+				vfree(rcv_desc->rx_buf_arr);
+				rcv_desc->rx_buf_arr = NULL;
+			}
+		}
+	}
+
+	vfree(cmd_buf_arr);
+
+	kfree(adapter->port);
+
+      err_out_free_adapter:
+	pci_set_drvdata(pdev, NULL);
+	kfree(adapter);
+
+      err_out_iounmap:
+	iounmap(mem_ptr);
+      err_out_free_res:
+	pci_release_regions(pdev);
+      err_out_disable_pdev:
+	pci_disable_device(pdev);
+	return err;
+}
+
+static void __devexit netxen_nic_remove(struct pci_dev *pdev)
+{
+	struct netxen_adapter *adapter;
+	struct netxen_port *port;
+	struct netxen_rx_buffer *buffer;
+	struct netxen_recv_context *recv_ctx;
+	struct netxen_rcv_desc_ctx *rcv_desc;
+	int i;
+	int ctxid, ring;
+
+	adapter = pci_get_drvdata(pdev);
+	if (adapter == NULL)
+		return;
+
+	netxen_nic_stop_all_ports(adapter);
+	/* leave the hw in the same state as reboot */
+	netxen_pinit_from_rom(adapter, 0);
+	udelay(500);
+	netxen_load_firmware(adapter);
+
+	if ((adapter->flags & NETXEN_NIC_MSI_ENABLED))
+		netxen_nic_disable_int(adapter);
+
+	udelay(500);		/* Delay for a while to drain the DMA engines */
+	for (i = 0; i < adapter->port_count; i++) {
+		port = adapter->port[i];
+		if ((port) && (port->netdev)) {
+			unregister_netdev(port->netdev);
+			free_netdev(port->netdev);
+		}
+	}
+
+	if ((adapter->flags & NETXEN_NIC_MSI_ENABLED))
+		pci_disable_msi(pdev);
+	pci_set_drvdata(pdev, NULL);
+	if (adapter->is_up == NETXEN_ADAPTER_UP_MAGIC)
+		netxen_free_hw_resources(adapter);
+
+	iounmap(adapter->ahw.pci_base);
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+
+	for (ctxid = 0; ctxid < MAX_RCV_CTX; ++ctxid) {
+		recv_ctx = &adapter->recv_ctx[ctxid];
+		for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
+			rcv_desc = &recv_ctx->rcv_desc[ring];
+			for (i = 0; i < rcv_desc->max_rx_desc_count; ++i) {
+				buffer = &(rcv_desc->rx_buf_arr[i]);
+				if (buffer->state == NETXEN_BUFFER_FREE)
+					continue;
+				pci_unmap_single(pdev, buffer->dma,
+						 rcv_desc->dma_size,
+						 PCI_DMA_FROMDEVICE);
+				if (buffer->skb != NULL)
+					dev_kfree_skb_any(buffer->skb);
+			}
+			vfree(rcv_desc->rx_buf_arr);
+		}
+	}
+
+	vfree(adapter->cmd_buf_arr);
+	kfree(adapter->ops);
+	kfree(adapter);
+}
+
+/*
+ * Called when a network interface is made active
+ * @returns 0 on success, negative value on failure
+ */
+static int netxen_nic_open(struct net_device *netdev)
+{
+	struct netxen_port *port = netdev_priv(netdev);
+	struct netxen_adapter *adapter = port->adapter;
+	struct netxen_rcv_desc_ctx *rcv_desc;
+	int err = 0;
+	int ctx, ring;
+
+	if (adapter->is_up != NETXEN_ADAPTER_UP_MAGIC) {
+		err = netxen_init_firmware(adapter);
+		if (err != 0) {
+			printk(KERN_ERR "Failed to init firmware\n");
+			return -EIO;
+		}
+		netxen_nic_flash_print(adapter);
+
+		/* setup all the resources for the Phantom... */
+		/* this include the descriptors for rcv, tx, and status */
+		netxen_nic_clear_stats(adapter);
+		err = netxen_nic_hw_resources(adapter);
+		if (err) {
+			printk(KERN_ERR "Error in setting hw resources:%d\n",
+			       err);
+			return err;
+		}
+		if (adapter->ops->init_port
+		    && adapter->ops->init_port(adapter, port->portnum) != 0) {
+			printk(KERN_ERR "%s: Failed to initialize port %d\n",
+			       netxen_nic_driver_name, port->portnum);
+			netxen_free_hw_resources(adapter);
+			return -EIO;
+		}
+		if (adapter->ops->init_niu)
+			adapter->ops->init_niu(adapter);
+		for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) {
+			for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
+				rcv_desc =
+				    &adapter->recv_ctx[ctx].rcv_desc[ring];
+				netxen_post_rx_buffers(adapter, ctx, ring);
+			}
+		}
+		adapter->is_up = NETXEN_ADAPTER_UP_MAGIC;
+	}
+	adapter->active_ports++;
+	if (adapter->active_ports == 1) {
+		err = request_irq(adapter->ahw.pdev->irq, &netxen_intr,
+				  SA_SHIRQ | SA_SAMPLE_RANDOM, netdev->name,
+				  adapter);
+		if (err) {
+			printk(KERN_ERR "request_irq failed with: %d\n", err);
+			adapter->active_ports--;
+			return err;
+		}
+		adapter->irq = adapter->ahw.pdev->irq;
+		if (!adapter->driver_mismatch)
+			mod_timer(&adapter->watchdog_timer, jiffies);
+
+		netxen_nic_enable_int(adapter);
+	}
+
+	/* Done here again so that even if phantom sw overwrote it,
+	 * we set it */
+	if (adapter->ops->macaddr_set)
+		adapter->ops->macaddr_set(port, netdev->dev_addr);
+	netxen_nic_set_link_parameters(port);
+
+	netxen_nic_set_multi(netdev);
+	if (!adapter->driver_mismatch)
+		netif_start_queue(netdev);
+
+	return 0;
+}
+
+/*
+ * netxen_nic_close - Disables a network interface entry point
+ */
+static int netxen_nic_close(struct net_device *netdev)
+{
+	struct netxen_port *port = netdev_priv(netdev);
+	struct netxen_adapter *adapter = port->adapter;
+	int i, j;
+	struct netxen_cmd_buffer *cmd_buff;
+	struct netxen_skb_frag *buffrag;
+
+	netif_carrier_off(netdev);
+	netif_stop_queue(netdev);
+
+	/* disable phy_ints */
+	if (adapter->ops->disable_phy_interrupts)
+		adapter->ops->disable_phy_interrupts(adapter, port->portnum);
+
+	adapter->active_ports--;
+
+	if (!adapter->active_ports) {
+		netxen_nic_disable_int(adapter);
+		if (adapter->irq)
+			free_irq(adapter->irq, adapter);
+		cmd_buff = adapter->cmd_buf_arr;
+		for (i = 0; i < adapter->max_tx_desc_count; i++) {
+			buffrag = cmd_buff->frag_array;
+			if (buffrag->dma) {
+				pci_unmap_single(port->pdev, buffrag->dma,
+						 buffrag->length,
+						 PCI_DMA_TODEVICE);
+				buffrag->dma = (u64) NULL;
+			}
+			for (j = 0; j < cmd_buff->frag_count; j++) {
+				buffrag++;
+				if (buffrag->dma) {
+					pci_unmap_page(port->pdev,
+						       buffrag->dma,
+						       buffrag->length,
+						       PCI_DMA_TODEVICE);
+					buffrag->dma = (u64) NULL;
+				}
+			}
+			/* Free the skb we received in netxen_nic_xmit_frame */
+			if (cmd_buff->skb) {
+				dev_kfree_skb_any(cmd_buff->skb);
+				cmd_buff->skb = NULL;
+			}
+			cmd_buff++;
+		}
+		del_timer_sync(&adapter->watchdog_timer);
+	}
+
+	return 0;
+}
+
+static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct netxen_port *port = netdev_priv(netdev);
+	struct netxen_adapter *adapter = port->adapter;
+	struct netxen_hardware_context *hw = &adapter->ahw;
+	unsigned int first_seg_len = skb->len - skb->data_len;
+	struct netxen_skb_frag *buffrag;
+	unsigned int i;
+
+	u32 producer = 0;
+	u32 saved_producer = 0;
+	struct cmd_desc_type0 *hwdesc;
+	int k;
+	struct netxen_cmd_buffer *pbuf = NULL;
+	unsigned int tries = 0;
+	static int dropped_packet = 0;
+	int frag_count;
+	u32 local_producer = 0;
+	u32 max_tx_desc_count = 0;
+	u32 last_cmd_consumer = 0;
+	int no_of_desc;
+
+	port->stats.xmitcalled++;
+	frag_count = skb_shinfo(skb)->nr_frags + 1;
+
+	if (unlikely(skb->len <= 0)) {
+		dev_kfree_skb_any(skb);
+		port->stats.badskblen++;
+		return NETDEV_TX_OK;
+	}
+
+	if (frag_count > MAX_BUFFERS_PER_CMD) {
+		printk("%s: %s netxen_nic_xmit_frame: frag_count (%d)"
+		       "too large, can handle only %d frags\n",
+		       netxen_nic_driver_name, netdev->name,
+		       frag_count, MAX_BUFFERS_PER_CMD);
+		port->stats.txdropped++;
+		if ((++dropped_packet & 0xff) == 0xff)
+			printk("%s: %s droppped packets = %d\n",
+			       netxen_nic_driver_name, netdev->name,
+			       dropped_packet);
+
+		return NETDEV_TX_OK;
+	}
+
+	/*
+	 * Everything is set up. Now, we just need to transmit it out.
+	 * Note that we have to copy the contents of buffer over to
+	 * right place. Later on, this can be optimized out by de-coupling the
+	 * producer index from the buffer index.
+	 */
+      retry_getting_window:
+	spin_lock_bh(&adapter->tx_lock);
+	if (adapter->total_threads == MAX_XMIT_PRODUCERS) {
+		spin_unlock_bh(&adapter->tx_lock);
+		/*
+		 * Yield CPU
+		 */
+		if (!in_atomic())
+			schedule();
+		else {
+			for (i = 0; i < 20; i++)
+				cpu_relax();	/*This a nop instr on i386 */
+		}
+		goto retry_getting_window;
+	}
+	local_producer = adapter->cmd_producer;
+	/* There 4 fragments per descriptor */
+	no_of_desc = (frag_count + 3) >> 2;
+	if (skb_shinfo(skb)->gso_size > 0) {
+		no_of_desc++;
+		if (((skb->nh.iph)->ihl * sizeof(u32)) +
+		    ((skb->h.th)->doff * sizeof(u32)) +
+		    sizeof(struct ethhdr) >
+		    (sizeof(struct cmd_desc_type0) - NET_IP_ALIGN)) {
+			no_of_desc++;
+		}
+	}
+	k = adapter->cmd_producer;
+	max_tx_desc_count = adapter->max_tx_desc_count;
+	last_cmd_consumer = adapter->last_cmd_consumer;
+	if ((k + no_of_desc) >=
+	    ((last_cmd_consumer <= k) ? last_cmd_consumer + max_tx_desc_count :
+	     last_cmd_consumer)) {
+		spin_unlock_bh(&adapter->tx_lock);
+		if (tries == 0) {
+			local_bh_disable();
+			netxen_process_cmd_ring((unsigned long)adapter);
+			local_bh_enable();
+			++tries;
+			goto retry_getting_window;
+		} else {
+			port->stats.nocmddescriptor++;
+			DPRINTK(ERR, "No command descriptors available,"
+				" producer = %d, consumer = %d count=%llu,"
+				" dropping packet\n", producer,
+				adapter->last_cmd_consumer,
+				port->stats.nocmddescriptor);
+
+			spin_lock_bh(&adapter->tx_lock);
+			netif_stop_queue(netdev);
+			port->flags |= NETXEN_NETDEV_STATUS;
+			spin_unlock_bh(&adapter->tx_lock);
+			return NETDEV_TX_BUSY;
+		}
+	}
+	k = get_index_range(k, max_tx_desc_count, no_of_desc);
+	adapter->cmd_producer = k;
+	adapter->total_threads++;
+	adapter->num_threads++;
+
+	spin_unlock_bh(&adapter->tx_lock);
+	/* Copy the descriptors into the hardware    */
+	producer = local_producer;
+	saved_producer = producer;
+	hwdesc = &hw->cmd_desc_head[producer];
+	memset(hwdesc, 0, sizeof(struct cmd_desc_type0));
+	/* Take skb->data itself */
+	pbuf = &adapter->cmd_buf_arr[producer];
+	if (skb_shinfo(skb)->gso_size > 0) {
+		pbuf->mss = skb_shinfo(skb)->gso_size;
+		hwdesc->mss = skb_shinfo(skb)->gso_size;
+	} else {
+		pbuf->mss = 0;
+		hwdesc->mss = 0;
+	}
+	pbuf->no_of_descriptors = no_of_desc;
+	pbuf->total_length = skb->len;
+	pbuf->skb = skb;
+	pbuf->cmd = TX_ETHER_PKT;
+	pbuf->frag_count = frag_count;
+	pbuf->port = port->portnum;
+	buffrag = &pbuf->frag_array[0];
+	buffrag->dma = pci_map_single(port->pdev, skb->data, first_seg_len,
+				      PCI_DMA_TODEVICE);
+	buffrag->length = first_seg_len;
+	CMD_DESC_TOTAL_LENGTH_WRT(hwdesc, skb->len);
+	hwdesc->num_of_buffers = frag_count;
+	hwdesc->opcode = TX_ETHER_PKT;
+
+	CMD_DESC_PORT_WRT(hwdesc, port->portnum);
+	hwdesc->buffer1_length = cpu_to_le16(first_seg_len);
+	hwdesc->addr_buffer1 = cpu_to_le64(buffrag->dma);
+
+	for (i = 1, k = 1; i < frag_count; i++, k++) {
+		struct skb_frag_struct *frag;
+		int len, temp_len;
+		unsigned long offset;
+		dma_addr_t temp_dma;
+
+		/* move to next desc. if there is a need */
+		if ((i & 0x3) == 0) {
+			k = 0;
+			producer = get_next_index(producer,
+						  adapter->max_tx_desc_count);
+			hwdesc = &hw->cmd_desc_head[producer];
+			memset(hwdesc, 0, sizeof(struct cmd_desc_type0));
+		}
+		frag = &skb_shinfo(skb)->frags[i - 1];
+		len = frag->size;
+		offset = frag->page_offset;
+
+		temp_len = len;
+		temp_dma = pci_map_page(port->pdev, frag->page, offset,
+					len, PCI_DMA_TODEVICE);
+
+		buffrag++;
+		buffrag->dma = temp_dma;
+		buffrag->length = temp_len;
+
+		DPRINTK(INFO, "for loop. i=%d k=%d\n", i, k);
+		switch (k) {
+		case 0:
+			hwdesc->buffer1_length = cpu_to_le16(temp_len);
+			hwdesc->addr_buffer1 = cpu_to_le64(temp_dma);
+			break;
+		case 1:
+			hwdesc->buffer2_length = cpu_to_le16(temp_len);
+			hwdesc->addr_buffer2 = cpu_to_le64(temp_dma);
+			break;
+		case 2:
+			hwdesc->buffer3_length = cpu_to_le16(temp_len);
+			hwdesc->addr_buffer3 = cpu_to_le64(temp_dma);
+			break;
+		case 3:
+			hwdesc->buffer4_length = temp_len;
+			hwdesc->addr_buffer4 = cpu_to_le64(temp_dma);
+			break;
+		}
+		frag++;
+	}
+	producer = get_next_index(producer, adapter->max_tx_desc_count);
+
+	/* might change opcode to TX_TCP_LSO */
+	netxen_tso_check(adapter, &hw->cmd_desc_head[saved_producer], skb);
+
+	/* For LSO, we need to copy the MAC/IP/TCP headers into
+	 * the descriptor ring
+	 */
+	if (hw->cmd_desc_head[saved_producer].opcode == TX_TCP_LSO) {
+		int hdr_len, first_hdr_len, more_hdr;
+		hdr_len = hw->cmd_desc_head[saved_producer].total_hdr_length;
+		if (hdr_len > (sizeof(struct cmd_desc_type0) - NET_IP_ALIGN)) {
+			first_hdr_len =
+			    sizeof(struct cmd_desc_type0) - NET_IP_ALIGN;
+			more_hdr = 1;
+		} else {
+			first_hdr_len = hdr_len;
+			more_hdr = 0;
+		}
+		/* copy the MAC/IP/TCP headers to the cmd descriptor list */
+		hwdesc = &hw->cmd_desc_head[producer];
+
+		/* copy the first 64 bytes */
+		memcpy(((void *)hwdesc) + NET_IP_ALIGN,
+		       (void *)(skb->data), first_hdr_len);
+		producer = get_next_index(producer, max_tx_desc_count);
+
+		if (more_hdr) {
+			hwdesc = &hw->cmd_desc_head[producer];
+			/* copy the next 64 bytes - should be enough except
+			 * for pathological case
+			 */
+			memcpy((void *)hwdesc, (void *)(skb->data) +
+			       first_hdr_len, hdr_len - first_hdr_len);
+			producer = get_next_index(producer, max_tx_desc_count);
+		}
+	}
+	spin_lock_bh(&adapter->tx_lock);
+	port->stats.txbytes +=
+	    CMD_DESC_TOTAL_LENGTH(&hw->cmd_desc_head[saved_producer]);
+	/* Code to update the adapter considering how many producer threads
+	   are currently working */
+	if ((--adapter->num_threads) == 0) {
+		/* This is the last thread */
+		u32 crb_producer = adapter->cmd_producer;
+		writel(crb_producer,
+		       NETXEN_CRB_NORMALIZE(adapter, CRB_CMD_PRODUCER_OFFSET));
+		wmb();
+		adapter->total_threads = 0;
+	} else {
+		u32 crb_producer = 0;
+		crb_producer =
+		    readl(NETXEN_CRB_NORMALIZE
+			  (adapter, CRB_CMD_PRODUCER_OFFSET));
+		if (crb_producer == local_producer) {
+			crb_producer = get_index_range(crb_producer,
+						       max_tx_desc_count,
+						       no_of_desc);
+			writel(crb_producer,
+			       NETXEN_CRB_NORMALIZE(adapter,
+						    CRB_CMD_PRODUCER_OFFSET));
+			wmb();
+		}
+	}
+
+	port->stats.xmitfinished++;
+	spin_unlock_bh(&adapter->tx_lock);
+
+	netdev->trans_start = jiffies;
+
+	DPRINTK(INFO, "wrote CMD producer %x to phantom\n", producer);
+
+	DPRINTK(INFO, "Done. Send\n");
+	return NETDEV_TX_OK;
+}
+
+static void netxen_watchdog(unsigned long v)
+{
+	struct netxen_adapter *adapter = (struct netxen_adapter *)v;
+	schedule_work(&adapter->watchdog_task);
+}
+
+static void netxen_tx_timeout(struct net_device *netdev)
+{
+	struct netxen_port *port = (struct netxen_port *)netdev_priv(netdev);
+	struct netxen_adapter *adapter = port->adapter;
+
+	schedule_work(&adapter->tx_timeout_task);
+}
+
+static void netxen_tx_timeout_task(struct net_device *netdev)
+{
+	struct netxen_port *port = (struct netxen_port *)netdev_priv(netdev);
+	unsigned long flags;
+
+	printk(KERN_ERR "%s %s: transmit timeout, resetting.\n",
+	       netxen_nic_driver_name, netdev->name);
+
+	spin_lock_irqsave(&port->adapter->lock, flags);
+	netxen_nic_close(netdev);
+	netxen_nic_open(netdev);
+	spin_unlock_irqrestore(&port->adapter->lock, flags);
+	netdev->trans_start = jiffies;
+	netif_wake_queue(netdev);
+}
+
+static int
+netxen_handle_int(struct netxen_adapter *adapter, struct net_device *netdev)
+{
+	u32 ret = 0;
+
+	DPRINTK(INFO, "Entered handle ISR\n");
+
+	adapter->stats.ints++;
+
+	if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
+		int count = 0;
+		u32 mask;
+		netxen_nic_disable_int(adapter);
+		/* Window = 0 or 1 */
+		do {
+			writel(0xffffffff, (void __iomem *)
+			       (adapter->ahw.pci_base + ISR_INT_TARGET_STATUS));
+			mask = readl((void __iomem *)
+				     (adapter->ahw.pci_base + ISR_INT_VECTOR));
+		} while (((mask & 0x80) != 0) && (++count < 32));
+		if ((mask & 0x80) != 0)
+			printk("Could not disable interrupt completely\n");
+
+	}
+	adapter->stats.hostints++;
+
+	if (netxen_nic_rx_has_work(adapter) || netxen_nic_tx_has_work(adapter)) {
+		if (netif_rx_schedule_prep(netdev)) {
+			/*
+			 * Interrupts are already disabled.
+			 */
+			__netif_rx_schedule(netdev);
+		} else {
+			static unsigned int intcount = 0;
+			if ((++intcount & 0xfff) == 0xfff)
+				printk(KERN_ERR
+				       "%s: %s interrupt %d while in poll\n",
+				       netxen_nic_driver_name, netdev->name,
+				       intcount);
+		}
+		ret = 1;
+	}
+
+	if (ret == 0) {
+		netxen_nic_enable_int(adapter);
+	}
+
+	return ret;
+}
+
+/*
+ * netxen_intr - Interrupt Handler
+ * @irq: interrupt number
+ * data points to adapter stucture (which may be handling more than 1 port
+ */
+irqreturn_t netxen_intr(int irq, void *data, struct pt_regs * regs)
+{
+	struct netxen_adapter *adapter;
+	struct netxen_port *port;
+	struct net_device *netdev;
+	int i;
+
+	if (unlikely(!irq)) {
+		return IRQ_NONE;	/* Not our interrupt */
+	}
+
+	adapter = (struct netxen_adapter *)data;
+	for (i = 0; i < adapter->ahw.max_ports; i++) {
+		port = adapter->port[i];
+		netdev = port->netdev;
+
+		/* process our status queue (for all 4 ports) */
+		netxen_handle_int(adapter, netdev);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int netxen_nic_poll(struct net_device *netdev, int *budget)
+{
+	struct netxen_port *port = (struct netxen_port *)netdev_priv(netdev);
+	struct netxen_adapter *adapter = port->adapter;
+	int work_to_do = min(*budget, netdev->quota);
+	int done = 1;
+	int ctx;
+	int this_work_done;
+
+	DPRINTK(INFO, "polling for %d descriptors\n", *budget);
+	port->stats.polled++;
+
+	adapter->work_done = 0;
+	for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) {
+		/*
+		 * Fairness issue. This will give undue weight to the
+		 * receive context 0.
+		 */
+
+		/*
+		 * To avoid starvation, we give each of our receivers,
+		 * a fraction of the quota. Sometimes, it might happen that we
+		 * have enough quota to process every packet, but since all the
+		 * packets are on one context, it gets only half of the quota,
+		 * and ends up not processing it.
+		 */
+		this_work_done = netxen_process_rcv_ring(adapter, ctx,
+							 work_to_do /
+							 MAX_RCV_CTX);
+		adapter->work_done += this_work_done;
+	}
+
+	netdev->quota -= adapter->work_done;
+	*budget -= adapter->work_done;
+
+	if (adapter->work_done >= work_to_do
+	    && netxen_nic_rx_has_work(adapter) != 0)
+		done = 0;
+
+	netxen_process_cmd_ring((unsigned long)adapter);
+
+	DPRINTK(INFO, "new work_done: %d work_to_do: %d\n",
+		adapter->work_done, work_to_do);
+	if (done) {
+		netif_rx_complete(netdev);
+		netxen_nic_enable_int(adapter);
+	}
+
+	return (done ? 0 : 1);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void netxen_nic_poll_controller(struct net_device *netdev)
+{
+	struct netxen_port *port = netdev_priv(netdev);
+	struct netxen_adapter *adapter = port->adapter;
+	disable_irq(adapter->irq);
+	netxen_intr(adapter->irq, adapter, NULL);
+	enable_irq(adapter->irq);
+}
+#endif
+/*
+ * netxen_nic_ioctl ()    We provide the tcl/phanmon support through these
+ * ioctls.
+ */
+static int
+netxen_nic_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	int err = 0;
+	struct netxen_port *port = netdev_priv(netdev);
+	struct netxen_adapter *adapter = port->adapter;
+
+	DPRINTK(INFO, "doing ioctl for %s\n", netdev->name);
+	switch (cmd) {
+	case NETXEN_NIC_CMD:
+		err = netxen_nic_do_ioctl(adapter, (void *)ifr->ifr_data, port);
+		break;
+
+	case NETXEN_NIC_NAME:
+		DPRINTK(INFO, "ioctl cmd for NetXen\n");
+		if (ifr->ifr_data) {
+			put_user(port->portnum, (u16 __user *) ifr->ifr_data);
+		}
+		break;
+
+	default:
+		DPRINTK(INFO, "ioctl cmd %x not supported\n", cmd);
+		err = -EOPNOTSUPP;
+		break;
+	}
+
+	return err;
+}
+
+static struct pci_driver netxen_driver = {
+	.name = netxen_nic_driver_name,
+	.id_table = netxen_pci_tbl,
+	.probe = netxen_nic_probe,
+	.remove = __devexit_p(netxen_nic_remove)
+};
+
+/* Driver Registration on NetXen card    */
+
+static int __init netxen_init_module(void)
+{
+	printk(KERN_INFO "%s \n", netxen_nic_driver_string);
+
+	return pci_module_init(&netxen_driver);
+}
+
+module_init(netxen_init_module);
+
+static void __exit netxen_exit_module(void)
+{
+	/*
+	 * Wait for some time to allow the dma to drain, if any.
+	 */
+	mdelay(5);
+	pci_unregister_driver(&netxen_driver);
+}
+
+module_exit(netxen_exit_module);