#define NETXEN_ADAPTER_UP_MAGIC 777
#define NETXEN_NIC_PEG_TUNE 0
-#define DMA_32BIT_MASK 0x00000000ffffffffULL
-#define DMA_35BIT_MASK 0x00000007ffffffffULL
-
/* Local functions to NetXen NIC driver */
static int __devinit netxen_nic_probe(struct pci_dev *pdev,
const struct pci_device_id *ent);
static void netxen_tx_timeout(struct net_device *netdev);
static void netxen_tx_timeout_task(struct work_struct *work);
static void netxen_watchdog(unsigned long);
-static int netxen_handle_int(struct netxen_adapter *, struct net_device *);
static int netxen_nic_poll(struct napi_struct *napi, 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);
+static irqreturn_t netxen_msi_intr(int irq, void *data);
int physical_port[] = {0, 1, 2, 3};
struct workqueue_struct *netxen_workq;
static void netxen_watchdog(unsigned long);
-static inline void netxen_nic_update_cmd_producer(struct netxen_adapter *adapter,
- uint32_t crb_producer)
+static void netxen_nic_update_cmd_producer(struct netxen_adapter *adapter,
+ uint32_t crb_producer)
{
switch (adapter->portnum) {
case 0:
}
}
-static inline void netxen_nic_update_cmd_consumer(struct netxen_adapter *adapter,
- u32 crb_consumer)
+static void netxen_nic_update_cmd_consumer(struct netxen_adapter *adapter,
+ u32 crb_consumer)
{
switch (adapter->portnum) {
case 0:
}
#define ADAPTER_LIST_SIZE 12
-int netxen_cards_found;
+
+static uint32_t msi_tgt_status[4] = {
+ ISR_INT_TARGET_STATUS, ISR_INT_TARGET_STATUS_F1,
+ ISR_INT_TARGET_STATUS_F2, ISR_INT_TARGET_STATUS_F3
+};
+
+static uint32_t sw_int_mask[4] = {
+ CRB_SW_INT_MASK_0, CRB_SW_INT_MASK_1,
+ CRB_SW_INT_MASK_2, CRB_SW_INT_MASK_3
+};
static void netxen_nic_disable_int(struct netxen_adapter *adapter)
{
- uint32_t mask = 0x7ff;
+ u32 mask = 0x7ff;
int retries = 32;
+ int port = adapter->portnum;
+ int pci_fn = adapter->ahw.pci_func;
- DPRINTK(1, INFO, "Entered ISR Disable \n");
-
- switch (adapter->portnum) {
- case 0:
- writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
- break;
- case 1:
- writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
- break;
- case 2:
- writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
- break;
- case 3:
- writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
- break;
+ if (adapter->msi_mode != MSI_MODE_MULTIFUNC) {
+ writel(0x0, NETXEN_CRB_NORMALIZE(adapter, sw_int_mask[port]));
}
if (adapter->intr_scheme != -1 &&
adapter->intr_scheme != INTR_SCHEME_PERPORT)
writel(mask,PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
- /* Window = 0 or 1 */
if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
do {
writel(0xffffffff,
printk(KERN_NOTICE "%s: Failed to disable interrupt completely\n",
netxen_nic_driver_name);
}
+ } else {
+ if (adapter->msi_mode == MSI_MODE_MULTIFUNC) {
+ writel(0xffffffff, PCI_OFFSET_SECOND_RANGE(adapter,
+ msi_tgt_status[pci_fn]));
+ }
}
-
- DPRINTK(1, INFO, "Done with Disable Int\n");
}
static void netxen_nic_enable_int(struct netxen_adapter *adapter)
{
u32 mask;
+ int port = adapter->portnum;
DPRINTK(1, INFO, "Entered ISR Enable \n");
writel(mask, PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
}
- switch (adapter->portnum) {
- case 0:
- writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
- break;
- case 1:
- writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
- break;
- case 2:
- writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
- break;
- case 3:
- writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
- break;
- }
+ writel(0x1, NETXEN_CRB_NORMALIZE(adapter, sw_int_mask[port]));
if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
mask = 0xbff;
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];
+ __le64 mac_addr[FLASH_NUM_PORTS + 1];
int valid_mac = 0;
u32 val;
int pci_func_id = PCI_FUNC(pdev->devfn);
printk(KERN_INFO "%s \n", netxen_nic_driver_string);
if (pdev->class != 0x020000) {
- printk(KERN_ERR"NetXen function %d, class %x will not"
+ printk(KERN_ERR"NetXen function %d, class %x will not "
"be enabled.\n",pci_func_id, pdev->class);
return -ENODEV;
}
adapter->ahw.pdev = pdev;
adapter->ahw.pci_func = pci_func_id;
- spin_lock_init(&adapter->tx_lock);
/* remap phys address */
mem_base = pci_resource_start(pdev, 0); /* 0 is for BAR 0 */
first_page_group_start = 0;
first_page_group_end = 0;
} else {
- err = -EIO;
+ err = -EIO;
goto err_out_free_netdev;
}
- if (((mem_ptr0 == 0UL) && (mem_len == NETXEN_PCI_128MB_SIZE)) ||
- (mem_ptr1 == 0UL) || (mem_ptr2 == 0UL)) {
+ if ((!mem_ptr0 && mem_len == NETXEN_PCI_128MB_SIZE) ||
+ !mem_ptr1 || !mem_ptr2) {
DPRINTK(ERR,
"Cannot remap adapter memory aborting.:"
"0 -> %p, 1 -> %p, 2 -> %p\n",
/* this will be read from FW later */
adapter->intr_scheme = -1;
+ adapter->msi_mode = -1;
/* This will be reset for mezz cards */
adapter->portnum = pci_func_id;
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->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->tx_timeout = netxen_tx_timeout;
- netdev->watchdog_timeo = HZ;
+ netdev->watchdog_timeo = 2*HZ;
netxen_nic_change_mtu(netdev, netdev->mtu);
adapter->max_tx_desc_count = MAX_CMD_DESCRIPTORS_HOST;
if ((adapter->ahw.boardcfg.board_type == NETXEN_BRDTYPE_P2_SB35_4G) ||
- (adapter->ahw.boardcfg.board_type ==
- NETXEN_BRDTYPE_P2_SB31_2G))
+ (adapter->ahw.boardcfg.board_type ==
+ NETXEN_BRDTYPE_P2_SB31_2G))
adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS_1G;
else
adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS;
vmalloc(RCV_BUFFSIZE);
if (rcv_desc->rx_buf_arr == NULL) {
- printk(KERN_ERR "%s: Could not allocate"
+ printk(KERN_ERR "%s: Could not allocate "
"rcv_desc->rx_buf_arr memory:%d\n",
netxen_nic_driver_name,
(int)RCV_BUFFSIZE);
adapter->watchdog_timer.data = (unsigned long)adapter;
INIT_WORK(&adapter->watchdog_task, netxen_watchdog_task);
adapter->ahw.pdev = pdev;
- adapter->proc_cmd_buf_counter = 0;
adapter->ahw.revision_id = pdev->revision;
/* make sure Window == 1 */
if (adapter->portnum == 0) {
err = netxen_initialize_adapter_offload(adapter);
- if (err)
+ if (err)
goto err_out_free_rx_buffer;
- val = readl(NETXEN_CRB_NORMALIZE(adapter,
+ val = readl(NETXEN_CRB_NORMALIZE(adapter,
NETXEN_CAM_RAM(0x1fc)));
if (val == 0x55555555) {
/* This is the first boot after power up */
/*
* Tell the hardware our version number.
*/
- i = (_NETXEN_NIC_LINUX_MAJOR << 16)
+ i = (_NETXEN_NIC_LINUX_MAJOR << 16)
| ((_NETXEN_NIC_LINUX_MINOR << 8))
| (_NETXEN_NIC_LINUX_SUBVERSION);
writel(i, NETXEN_CRB_NORMALIZE(adapter, CRB_DRIVER_VERSION));
break;
case NETXEN_NIC_XGBE:
- printk(KERN_INFO "%s: XGbE board initialized\n",
+ printk(KERN_INFO "%s: XGbE board initialized\n",
netxen_nic_driver_name);
break;
}
unregister_netdev(netdev);
- if (adapter->stop_port)
- adapter->stop_port(adapter);
-
- netxen_nic_disable_int(adapter);
-
if (adapter->is_up == NETXEN_ADAPTER_UP_MAGIC) {
init_firmware_done++;
netxen_free_hw_resources(adapter);
struct netxen_adapter *adapter = (struct netxen_adapter *)netdev->priv;
int err = 0;
int ctx, ring;
+ irq_handler_t handler;
+ unsigned long flags = IRQF_SAMPLE_RANDOM;
if (adapter->is_up != NETXEN_ADAPTER_UP_MAGIC) {
err = netxen_init_firmware(adapter);
netxen_post_rx_buffers(adapter, ctx, ring);
}
adapter->irq = adapter->ahw.pdev->irq;
- err = request_irq(adapter->ahw.pdev->irq, netxen_intr,
- IRQF_SHARED|IRQF_SAMPLE_RANDOM, netdev->name,
- adapter);
+ if (adapter->flags & NETXEN_NIC_MSI_ENABLED)
+ handler = netxen_msi_intr;
+ else {
+ flags |= IRQF_SHARED;
+ handler = netxen_intr;
+ }
+ err = request_irq(adapter->irq, handler,
+ flags, netdev->name, adapter);
if (err) {
printk(KERN_ERR "request_irq failed with: %d\n", err);
netxen_free_hw_resources(adapter);
adapter->is_up = NETXEN_ADAPTER_UP_MAGIC;
}
- if (!adapter->driver_mismatch)
- mod_timer(&adapter->watchdog_timer, jiffies);
-
- napi_enable(&adapter->napi);
-
- netxen_nic_enable_int(adapter);
-
/* Done here again so that even if phantom sw overwrote it,
* we set it */
if (adapter->init_port
&& adapter->init_port(adapter, adapter->portnum) != 0) {
- del_timer_sync(&adapter->watchdog_timer);
printk(KERN_ERR "%s: Failed to initialize port %d\n",
netxen_nic_driver_name, adapter->portnum);
- napi_disable(&adapter->napi);
return -EIO;
}
if (adapter->macaddr_set)
if (adapter->set_mtu)
adapter->set_mtu(adapter, netdev->mtu);
+ if (!adapter->driver_mismatch)
+ mod_timer(&adapter->watchdog_timer, jiffies);
+
+ napi_enable(&adapter->napi);
+ netxen_nic_enable_int(adapter);
+
if (!adapter->driver_mismatch)
netif_start_queue(netdev);
netif_stop_queue(netdev);
napi_disable(&adapter->napi);
+ if (adapter->stop_port)
+ adapter->stop_port(adapter);
+
netxen_nic_disable_int(adapter);
cmd_buff = adapter->cmd_buf_arr;
buffrag++;
if (buffrag->dma) {
pci_unmap_page(adapter->pdev, buffrag->dma,
- buffrag->length,
+ buffrag->length,
PCI_DMA_TODEVICE);
buffrag->dma = 0ULL;
}
struct netxen_skb_frag *buffrag;
unsigned int i;
- u32 producer = 0;
+ u32 producer, consumer;
u32 saved_producer = 0;
struct cmd_desc_type0 *hwdesc;
int k;
struct netxen_cmd_buffer *pbuf = NULL;
- 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;
+ u32 num_txd = adapter->max_tx_desc_count;
- adapter->stats.xmitcalled++;
frag_count = skb_shinfo(skb)->nr_frags + 1;
- if (unlikely(skb->len <= 0)) {
- dev_kfree_skb_any(skb);
- adapter->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);
- adapter->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 (netdev->features & NETIF_F_TSO) {
}
}
}
- 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)) {
+
+ producer = adapter->cmd_producer;
+ smp_mb();
+ consumer = adapter->last_cmd_consumer;
+ if ((no_of_desc+2) > find_diff_among(producer, consumer, num_txd)) {
netif_stop_queue(netdev);
- adapter->flags |= NETXEN_NETDEV_STATUS;
- spin_unlock_bh(&adapter->tx_lock);
+ smp_mb();
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));
/* 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);
+ producer = get_next_index(producer, num_txd);
hwdesc = &hw->cmd_desc_head[producer];
memset(hwdesc, 0, sizeof(struct cmd_desc_type0));
+ pbuf = &adapter->cmd_buf_arr[producer];
+ pbuf->skb = NULL;
}
frag = &skb_shinfo(skb)->frags[i - 1];
len = frag->size;
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);
}
frag++;
}
- producer = get_next_index(producer, adapter->max_tx_desc_count);
+ producer = get_next_index(producer, num_txd);
/* might change opcode to TX_TCP_LSO */
netxen_tso_check(adapter, &hw->cmd_desc_head[saved_producer], skb);
}
/* copy the MAC/IP/TCP headers to the cmd descriptor list */
hwdesc = &hw->cmd_desc_head[producer];
+ pbuf = &adapter->cmd_buf_arr[producer];
+ pbuf->skb = NULL;
/* copy the first 64 bytes */
memcpy(((void *)hwdesc) + 2,
(void *)(skb->data), first_hdr_len);
- producer = get_next_index(producer, max_tx_desc_count);
+ producer = get_next_index(producer, num_txd);
if (more_hdr) {
hwdesc = &hw->cmd_desc_head[producer];
+ pbuf = &adapter->cmd_buf_arr[producer];
+ pbuf->skb = NULL;
/* copy the next 64 bytes - should be enough except
* for pathological case
*/
hwdesc,
(hdr_len -
first_hdr_len));
- producer = get_next_index(producer, max_tx_desc_count);
+ producer = get_next_index(producer, num_txd);
}
}
- i = netxen_get_cmd_desc_totallength(&hw->cmd_desc_head[saved_producer]);
-
- hw->cmd_desc_head[saved_producer].flags_opcode =
- cpu_to_le16(hw->cmd_desc_head[saved_producer].flags_opcode);
- hw->cmd_desc_head[saved_producer].num_of_buffers_total_length =
- cpu_to_le32(hw->cmd_desc_head[saved_producer].
- num_of_buffers_total_length);
-
- spin_lock_bh(&adapter->tx_lock);
- adapter->stats.txbytes += i;
-
- /* 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;
- netxen_nic_update_cmd_producer(adapter, crb_producer);
- wmb();
- adapter->total_threads = 0;
- }
+ adapter->cmd_producer = producer;
+ adapter->stats.txbytes += skb->len;
- adapter->stats.xmitfinished++;
- spin_unlock_bh(&adapter->tx_lock);
+ netxen_nic_update_cmd_producer(adapter, adapter->cmd_producer);
+ adapter->stats.xmitcalled++;
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_tx_timeout_task(struct work_struct *work)
{
- struct netxen_adapter *adapter =
+ struct netxen_adapter *adapter =
container_of(work, struct netxen_adapter, tx_timeout_task);
printk(KERN_ERR "%s %s: transmit timeout, resetting.\n",
netxen_nic_driver_name, adapter->netdev->name);
- netxen_nic_close(adapter->netdev);
- netxen_nic_open(adapter->netdev);
+ netxen_nic_disable_int(adapter);
+ napi_disable(&adapter->napi);
+
adapter->netdev->trans_start = jiffies;
+
+ napi_enable(&adapter->napi);
+ netxen_nic_enable_int(adapter);
netif_wake_queue(adapter->netdev);
}
-static int
-netxen_handle_int(struct netxen_adapter *adapter, struct net_device *netdev)
+static inline void
+netxen_handle_int(struct netxen_adapter *adapter)
{
- u32 ret = 0;
-
- DPRINTK(INFO, "Entered handle ISR\n");
- adapter->stats.ints++;
-
netxen_nic_disable_int(adapter);
-
- if (netxen_nic_rx_has_work(adapter) || netxen_nic_tx_has_work(adapter)) {
- if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
- /*
- * Interrupts are already disabled.
- */
- __netif_rx_schedule(netdev, &adapter->napi);
- } else {
- static unsigned int intcount = 0;
- if ((++intcount & 0xfff) == 0xfff)
- DPRINTK(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;
+ napi_schedule(&adapter->napi);
}
-/*
- * 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 netxen_adapter *adapter;
- struct net_device *netdev;
+ struct netxen_adapter *adapter = data;
u32 our_int = 0;
- if (unlikely(!irq)) {
- return IRQ_NONE; /* Not our interrupt */
- }
-
- adapter = (struct netxen_adapter *)data;
- netdev = adapter->netdev;
-
- if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
- our_int = readl(NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
- /* not our interrupt */
- if ((our_int & (0x80 << adapter->portnum)) == 0)
- return IRQ_NONE;
- }
+ our_int = readl(NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
+ /* not our interrupt */
+ if ((our_int & (0x80 << adapter->portnum)) == 0)
+ return IRQ_NONE;
if (adapter->intr_scheme == INTR_SCHEME_PERPORT) {
/* claim interrupt */
- if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
- writel(our_int & ~((u32)(0x80 << adapter->portnum)),
+ writel(our_int & ~((u32)(0x80 << adapter->portnum)),
NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
- }
}
- if (netif_running(netdev))
- netxen_handle_int(adapter, netdev);
+ netxen_handle_int(adapter);
+
+ return IRQ_HANDLED;
+}
+
+irqreturn_t netxen_msi_intr(int irq, void *data)
+{
+ struct netxen_adapter *adapter = data;
+ netxen_handle_int(adapter);
return IRQ_HANDLED;
}
static int netxen_nic_poll(struct napi_struct *napi, int budget)
{
struct netxen_adapter *adapter = container_of(napi, struct netxen_adapter, napi);
- struct net_device *netdev = adapter->netdev;
- int done = 1;
+ int tx_complete;
int ctx;
int work_done;
- DPRINTK(INFO, "polling for %d descriptors\n", *budget);
+ tx_complete = netxen_process_cmd_ring(adapter);
work_done = 0;
for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) {
budget / MAX_RCV_CTX);
}
- if (work_done >= budget && netxen_nic_rx_has_work(adapter) != 0)
- done = 0;
-
- if (netxen_process_cmd_ring((unsigned long)adapter) == 0)
- done = 0;
-
- DPRINTK(INFO, "new work_done: %d work_to_do: %d\n",
- work_done, work_to_do);
- if (done) {
- netif_rx_complete(netdev, napi);
+ if ((work_done < budget) && tx_complete) {
+ netif_rx_complete(adapter->netdev, &adapter->napi);
netxen_nic_enable_int(adapter);
}
static int __init netxen_init_module(void)
{
- if ((netxen_workq = create_singlethread_workqueue("netxen")) == 0)
+ if ((netxen_workq = create_singlethread_workqueue("netxen")) == NULL)
return -ENOMEM;
return pci_register_driver(&netxen_driver);