static void usbnet_bh (unsigned long param)
{
struct usbnet *dev = (struct usbnet *) param;
struct sk_buff *skb;
struct skb_data *entry;
while ((skb = skb_dequeue (&dev->done))) {
entry = (struct skb_data *) skb->cb;
switch (entry->state) {
case rx_done:
entry->state = rx_cleanup;
rx_process (dev, skb);
continue;
case tx_done:
case rx_cleanup:
usb_free_urb (entry->urb);
dev_kfree_skb (skb);
continue;
default:
netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
}
}
// waiting for all pending urbs to complete?
if (dev->wait) {
if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
wake_up (dev->wait);
}
// or are we maybe short a few urbs?
} else if (netif_running (dev->net) &&
netif_device_present (dev->net) &&
!timer_pending (&dev->delay) &&
!test_bit (EVENT_RX_HALT, &dev->flags)) {
int temp = dev->rxq.qlen;
int qlen = RX_QLEN (dev);
if (temp < qlen) {
struct urb *urb;
int i;
// don't refill the queue all at once
for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
urb = usb_alloc_urb (0, GFP_ATOMIC);
if (urb != NULL)
rx_submit (dev, urb, GFP_ATOMIC);
}
if (temp != dev->rxq.qlen)
netif_dbg(dev, link, dev->net,
"rxqlen %d --> %d\n",
temp, dev->rxq.qlen);
if (dev->rxq.qlen < qlen)
tasklet_schedule (&dev->bh);
}
if (dev->txq.qlen < TX_QLEN (dev))
netif_wake_queue (dev->net);
}
}
int usbnet_open (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
int retval;
struct driver_info *info = dev->driver_info;
if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
netif_info(dev, ifup, dev->net,
"resumption fail (%d) usbnet usb-%s-%s, %s\n",
retval,
dev->udev->bus->bus_name,
dev->udev->devpath,
info->description);
goto done_nopm;
}
// put into "known safe" state
if (info->reset && (retval = info->reset (dev)) < 0) {
netif_info(dev, ifup, dev->net,
"open reset fail (%d) usbnet usb-%s-%s, %s\n",
retval,
dev->udev->bus->bus_name,
dev->udev->devpath,
info->description);
goto done;
}
// insist peer be connected
if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
goto done;
}
/* start any status interrupt transfer */
if (dev->interrupt) {
retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
if (retval < 0) {
netif_err(dev, ifup, dev->net,
"intr submit %d\n", retval);
goto done;
}
}
netif_start_queue (net);
netif_info(dev, ifup, dev->net,
"open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
(int)RX_QLEN(dev), (int)TX_QLEN(dev),
dev->net->mtu,
(dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
(dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
(dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
(dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
(dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
"simple");
// delay posting reads until we're fully open
tasklet_schedule (&dev->bh);
if (info->manage_power) {
retval = info->manage_power(dev, 1);
if (retval < 0)
goto done;
usb_autopm_put_interface(dev->intf);
}
return retval;
done:
usb_autopm_put_interface(dev->intf);
done_nopm:
return retval;
}
static
int axusbnet_open(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
int retval = 0;
struct driver_info *info = dev->driver_info;
/* put into "known safe" state */
if (info->reset) {
retval = info->reset(dev);
if (retval < 0) {
if (netif_msg_ifup(dev))
devinfo(dev,
"open reset fail (%d) usbnet usb-%s-%s, %s",
retval,
dev->udev->bus->bus_name,
dev->udev->devpath,
info->description);
goto done;
}
}
/* insist peer be connected */
if (info->check_connect) {
retval = info->check_connect(dev);
if (retval < 0) {
if (netif_msg_ifup(dev))
devdbg(dev, "can't open; %d", retval);
goto done;
}
}
/* start any status interrupt transfer */
if (dev->interrupt) {
retval = usb_submit_urb(dev->interrupt, GFP_KERNEL);
if (retval < 0) {
if (netif_msg_ifup(dev))
deverr(dev, "intr submit %d", retval);
goto done;
}
}
netif_start_queue(net);
if (netif_msg_ifup(dev)) {
char *framing;
if (dev->driver_info->flags & FLAG_FRAMING_NC)
framing = "NetChip";
else if (dev->driver_info->flags & FLAG_FRAMING_GL)
framing = "GeneSys";
else if (dev->driver_info->flags & FLAG_FRAMING_Z)
framing = "Zaurus";
else if (dev->driver_info->flags & FLAG_FRAMING_RN)
framing = "RNDIS";
else if (dev->driver_info->flags & FLAG_FRAMING_AX)
framing = "ASIX";
else
framing = "simple";
devinfo(dev, "open: enable queueing (rx %d, tx %d) mtu %d %s framing",
(int)RX_QLEN(dev), (int)TX_QLEN(dev), dev->net->mtu,
framing);
}
/* delay posting reads until we're fully open */
tasklet_schedule(&dev->bh);
return retval;
done:
return retval;
}
static void kevent(void *data)
{
struct usbnet *dev = (struct usbnet *)data;
#else
static void kevent(struct work_struct *work)
{
struct usbnet *dev =
container_of(work, struct usbnet, kevent);
#endif
int status;
/* usb_clear_halt() needs a thread context */
if (test_bit(EVENT_TX_HALT, &dev->flags)) {
unlink_urbs(dev, &dev->txq);
status = usb_clear_halt(dev->udev, dev->out);
if (status < 0
&& status != -EPIPE
&& status != -ESHUTDOWN) {
if (netif_msg_tx_err(dev))
deverr(dev, "can't clear tx halt, status %d",
status);
} else {
clear_bit(EVENT_TX_HALT, &dev->flags);
if (status != -ESHUTDOWN)
netif_wake_queue(dev->net);
}
}
if (test_bit(EVENT_RX_HALT, &dev->flags)) {
unlink_urbs(dev, &dev->rxq);
status = usb_clear_halt(dev->udev, dev->in);
if (status < 0
&& status != -EPIPE
&& status != -ESHUTDOWN) {
if (netif_msg_rx_err(dev))
deverr(dev, "can't clear rx halt, status %d",
status);
} else {
clear_bit(EVENT_RX_HALT, &dev->flags);
tasklet_schedule(&dev->bh);
}
}
/* tasklet could resubmit itself forever if memory is tight */
if (test_bit(EVENT_RX_MEMORY, &dev->flags)) {
struct urb *urb = NULL;
if (netif_running(dev->net))
urb = usb_alloc_urb(0, GFP_KERNEL);
else
clear_bit(EVENT_RX_MEMORY, &dev->flags);
if (urb != NULL) {
clear_bit(EVENT_RX_MEMORY, &dev->flags);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14)
urb->transfer_flags |= URB_ASYNC_UNLINK;
#endif
rx_submit(dev, urb, GFP_KERNEL);
tasklet_schedule(&dev->bh);
}
}
if (test_bit(EVENT_LINK_RESET, &dev->flags)) {
struct driver_info *info = dev->driver_info;
int retval = 0;
clear_bit(EVENT_LINK_RESET, &dev->flags);
if (info->link_reset) {
retval = info->link_reset(dev);
if (retval < 0) {
devinfo(dev,
"link reset failed (%d) usbnet usb-%s-%s, %s",
retval,
dev->udev->bus->bus_name,
dev->udev->devpath,
info->description);
}
}
}
if (dev->flags)
devdbg(dev, "kevent done, flags = 0x%lx", dev->flags);
}
/*-------------------------------------------------------------------------*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
static void tx_complete(struct urb *urb, struct pt_regs *regs)
#else
static void tx_complete(struct urb *urb)
#endif
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct skb_data *entry = (struct skb_data *) skb->cb;
struct usbnet *dev = entry->dev;
if (urb->status == 0) {
dev->stats.tx_packets++;
dev->stats.tx_bytes += entry->length;
} else {
dev->stats.tx_errors++;
switch (urb->status) {
case -EPIPE:
axusbnet_defer_kevent(dev, EVENT_TX_HALT);
break;
/* software-driven interface shutdown */
case -ECONNRESET: /* async unlink */
case -ESHUTDOWN: /* hardware gone */
break;
/* like rx, tx gets controller i/o faults during khubd delays */
/* and so it uses the same throttling mechanism. */
case -EPROTO:
case -ETIME:
case -EILSEQ:
if (!timer_pending(&dev->delay)) {
mod_timer(&dev->delay,
jiffies + THROTTLE_JIFFIES);
if (netif_msg_link(dev))
devdbg(dev, "tx throttle %d",
urb->status);
}
netif_stop_queue(dev->net);
break;
default:
if (netif_msg_tx_err(dev))
devdbg(dev, "tx err %d", entry->urb->status);
break;
}
}
urb->dev = NULL;
entry->state = tx_done;
defer_bh(dev, skb, &dev->txq);
}
/*-------------------------------------------------------------------------*/
static
void axusbnet_tx_timeout(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
unlink_urbs(dev, &dev->txq);
tasklet_schedule(&dev->bh);
/* FIXME: device recovery -- reset? */
}
/*-------------------------------------------------------------------------*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 32)
static int
#else
static netdev_tx_t
#endif
axusbnet_start_xmit(struct sk_buff *skb, struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
int length;
struct urb *urb = NULL;
struct skb_data *entry;
struct driver_info *info = dev->driver_info;
unsigned long flags;
int retval;
/* some devices want funky USB-level framing, for */
/* win32 driver (usually) and/or hardware quirks */
if (info->tx_fixup) {
skb = info->tx_fixup(dev, skb, GFP_ATOMIC);
if (!skb) {
if (netif_msg_tx_err(dev))
devdbg(dev, "can't tx_fixup skb");
goto drop;
}
}
length = skb->len;
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
if (netif_msg_tx_err(dev))
devdbg(dev, "no urb");
goto drop;
}
entry = (struct skb_data *) skb->cb;
entry->urb = urb;
entry->dev = dev;
entry->state = tx_start;
entry->length = length;
usb_fill_bulk_urb(urb, dev->udev, dev->out, skb->data,
skb->len, tx_complete, skb);
/* don't assume the hardware handles USB_ZERO_PACKET
* NOTE: strictly conforming cdc-ether devices should expect
* the ZLP here, but ignore the one-byte packet.
*/
if (!(info->flags & FLAG_SEND_ZLP) && (length % dev->maxpacket) == 0) {
urb->transfer_buffer_length++;
if (skb_tailroom(skb)) {
skb->data[skb->len] = 0;
__skb_put(skb, 1);
}
}
spin_lock_irqsave(&dev->txq.lock, flags);
switch ((retval = usb_submit_urb(urb, GFP_ATOMIC))) {
case -EPIPE:
netif_stop_queue(net);
axusbnet_defer_kevent(dev, EVENT_TX_HALT);
break;
default:
if (netif_msg_tx_err(dev))
devdbg(dev, "tx: submit urb err %d", retval);
break;
case 0:
net->trans_start = jiffies;
__skb_queue_tail(&dev->txq, skb);
if (dev->txq.qlen >= TX_QLEN(dev))
netif_stop_queue(net);
}
spin_unlock_irqrestore(&dev->txq.lock, flags);
if (retval) {
if (netif_msg_tx_err(dev))
devdbg(dev, "drop, code %d", retval);
drop:
dev->stats.tx_dropped++;
if (skb)
dev_kfree_skb_any(skb);
usb_free_urb(urb);
} else if (netif_msg_tx_queued(dev)) {
devdbg(dev, "> tx, len %d, type 0x%x",
length, skb->protocol);
}
return NETDEV_TX_OK;
}
/*-------------------------------------------------------------------------*/
/* tasklet (work deferred from completions, in_irq) or timer */
static void axusbnet_bh(unsigned long param)
{
struct usbnet *dev = (struct usbnet *) param;
struct sk_buff *skb;
struct skb_data *entry;
while ((skb = skb_dequeue(&dev->done))) {
entry = (struct skb_data *) skb->cb;
switch (entry->state) {
case rx_done:
entry->state = rx_cleanup;
rx_process(dev, skb);
continue;
case tx_done:
case rx_cleanup:
usb_free_urb(entry->urb);
dev_kfree_skb(skb);
continue;
default:
devdbg(dev, "bogus skb state %d", entry->state);
}
}
/* waiting for all pending urbs to complete? */
if (dev->wait) {
if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0)
wake_up(dev->wait);
/* or are we maybe short a few urbs? */
} else if (netif_running(dev->net)
&& netif_device_present(dev->net)
&& !timer_pending(&dev->delay)
&& !test_bit(EVENT_RX_HALT, &dev->flags)) {
int temp = dev->rxq.qlen;
int qlen = RX_QLEN(dev);
if (temp < qlen) {
struct urb *urb;
int i;
/* don't refill the queue all at once */
for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (urb != NULL) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14)
urb->transfer_flags |= URB_ASYNC_UNLINK;
#endif
rx_submit(dev, urb, GFP_ATOMIC);
}
}
if (temp != dev->rxq.qlen && netif_msg_link(dev))
devdbg(dev, "rxqlen %d --> %d",
temp, dev->rxq.qlen);
if (dev->rxq.qlen < qlen)
tasklet_schedule(&dev->bh);
}
if (dev->txq.qlen < TX_QLEN(dev))
netif_wake_queue(dev->net);
}
}
/*-------------------------------------------------------------------------
*
* USB Device Driver support
*
*-------------------------------------------------------------------------*/
/* precondition: never called in_interrupt */
static
void axusbnet_disconnect(struct usb_interface *intf)
{
struct usbnet *dev;
struct usb_device *xdev;
struct net_device *net;
dev = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
if (!dev)
return;
xdev = interface_to_usbdev(intf);
if (netif_msg_probe(dev))
devinfo(dev, "unregister '%s' usb-%s-%s, %s",
intf->dev.driver->name,
xdev->bus->bus_name, xdev->devpath,
dev->driver_info->description);
net = dev->net;
unregister_netdev(net);
/* we don't hold rtnl here ... */
flush_scheduled_work();
if (dev->driver_info->unbind)
dev->driver_info->unbind(dev, intf);
free_netdev(net);
usb_put_dev(xdev);
}
/*-------------------------------------------------------------------------*/
/* precondition: never called in_interrupt */
static int
axusbnet_probe(struct usb_interface *udev, const struct usb_device_id *prod)
{
struct usbnet *dev;
struct net_device *net;
struct usb_host_interface *interface;
struct driver_info *info;
struct usb_device *xdev;
int status;
const char *name;
name = udev->dev.driver->name;
info = (struct driver_info *) prod->driver_info;
if (!info) {
printk(KERN_ERR "blacklisted by %s\n", name);
return -ENODEV;
}
xdev = interface_to_usbdev(udev);
interface = udev->cur_altsetting;
usb_get_dev(xdev);
status = -ENOMEM;
/* set up our own records */
net = alloc_etherdev(sizeof(*dev));
if (!net) {
printk(KERN_ERR "can't kmalloc dev");
goto out;
}
dev = netdev_priv(net);
dev->udev = xdev;
dev->intf = udev;
dev->driver_info = info;
dev->driver_name = name;
dev->msg_enable = netif_msg_init(msg_level, NETIF_MSG_DRV |
NETIF_MSG_PROBE | NETIF_MSG_LINK);
skb_queue_head_init(&dev->rxq);
skb_queue_head_init(&dev->txq);
skb_queue_head_init(&dev->done);
dev->bh.func = axusbnet_bh;
dev->bh.data = (unsigned long) dev;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
INIT_WORK(&dev->kevent, kevent, dev);
#else
INIT_WORK(&dev->kevent, kevent);
#endif
dev->delay.function = axusbnet_bh;
dev->delay.data = (unsigned long) dev;
init_timer(&dev->delay);
/* mutex_init(&dev->phy_mutex); */
dev->net = net;
/* rx and tx sides can use different message sizes;
* bind() should set rx_urb_size in that case.
*/
dev->hard_mtu = net->mtu + net->hard_header_len;
#if 0
/* dma_supported() is deeply broken on almost all architectures */
/* possible with some EHCI controllers */
if (dma_supported(&udev->dev, DMA_BIT_MASK(64)))
net->features |= NETIF_F_HIGHDMA;
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30)
net->open = axusbnet_open,
net->stop = axusbnet_stop,
net->hard_start_xmit = axusbnet_start_xmit,
net->tx_timeout = axusbnet_tx_timeout,
net->get_stats = axusbnet_get_stats;
#endif
net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
net->ethtool_ops = &axusbnet_ethtool_ops;
/* allow device-specific bind/init procedures */
/* NOTE net->name still not usable ... */
status = info->bind(dev, udev);
if (status < 0) {
deverr(dev, "Binding device failed: %d", status);
goto out1;
}
/* maybe the remote can't receive an Ethernet MTU */
if (net->mtu > (dev->hard_mtu - net->hard_header_len))
net->mtu = dev->hard_mtu - net->hard_header_len;
status = init_status(dev, udev);
if (status < 0)
goto out3;
if (!dev->rx_urb_size)
dev->rx_urb_size = dev->hard_mtu;
dev->maxpacket = usb_maxpacket(dev->udev, dev->out, 1);
SET_NETDEV_DEV(net, &udev->dev);
status = register_netdev(net);
if (status) {
deverr(dev, "net device registration failed: %d", status);
goto out3;
}
if (netif_msg_probe(dev))
devinfo(dev, "register '%s' at usb-%s-%s, %s, %pM",
udev->dev.driver->name,
xdev->bus->bus_name, xdev->devpath,
dev->driver_info->description,
net->dev_addr);
/* ok, it's ready to go. */
usb_set_intfdata(udev, dev);
/* start as if the link is up */
netif_device_attach(net);
return 0;
out3:
if (info->unbind)
info->unbind(dev, udev);
out1:
free_netdev(net);
out:
usb_put_dev(xdev);
return status;
}
/*-------------------------------------------------------------------------*/
/*
* suspend the whole driver as soon as the first interface is suspended
* resume only when the last interface is resumed
*/
static int axusbnet_suspend(struct usb_interface *intf,
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 10)
pm_message_t message)
#else
u32 message)
#endif
{
struct usbnet *dev = usb_get_intfdata(intf);
if (!dev->suspend_count++) {
/*
* accelerate emptying of the rx and queues, to avoid
* having everything error out.
*/
netif_device_detach(dev->net);
(void) unlink_urbs(dev, &dev->rxq);
(void) unlink_urbs(dev, &dev->txq);
usb_kill_urb(dev->interrupt);
/*
* reattach so runtime management can use and
* wake the device
*/
netif_device_attach(dev->net);
}
return 0;
}
static int
axusbnet_resume(struct usb_interface *intf)
{
struct usbnet *dev = usb_get_intfdata(intf);
int retval = 0;
if (!--dev->suspend_count)
tasklet_schedule(&dev->bh);
retval = init_status(dev, intf);
if (retval < 0)
return retval;
if (dev->interrupt) {
retval = usb_submit_urb(dev->interrupt, GFP_KERNEL);
if (retval < 0 && netif_msg_ifup(dev))
deverr(dev, "intr submit %d", retval);
}
return retval;
}
int usbnet_open (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
int retval;
struct driver_info *info = dev->driver_info;
if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
if (netif_msg_ifup (dev))
devinfo (dev,
"resumption fail (%d) usbnet usb-%s-%s, %s",
retval,
dev->udev->bus->bus_name, dev->udev->devpath,
info->description);
goto done_nopm;
}
// put into "known safe" state
if (info->reset && (retval = info->reset (dev)) < 0) {
if (netif_msg_ifup (dev))
devinfo (dev,
"open reset fail (%d) usbnet usb-%s-%s, %s",
retval,
dev->udev->bus->bus_name, dev->udev->devpath,
info->description);
goto done;
}
// insist peer be connected
if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
if (netif_msg_ifup (dev))
devdbg (dev, "can't open; %d", retval);
goto done;
}
/* start any status interrupt transfer */
if (dev->interrupt) {
retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
if (retval < 0) {
if (netif_msg_ifup (dev))
deverr (dev, "intr submit %d", retval);
goto done;
}
}
netif_start_queue (net);
if (netif_msg_ifup (dev)) {
char *framing;
if (dev->driver_info->flags & FLAG_FRAMING_NC)
framing = "NetChip";
else if (dev->driver_info->flags & FLAG_FRAMING_GL)
framing = "GeneSys";
else if (dev->driver_info->flags & FLAG_FRAMING_Z)
framing = "Zaurus";
else if (dev->driver_info->flags & FLAG_FRAMING_RN)
framing = "RNDIS";
else if (dev->driver_info->flags & FLAG_FRAMING_AX)
framing = "ASIX";
else
framing = "simple";
devinfo (dev, "open: enable queueing "
"(rx %d, tx %d) mtu %d %s framing",
(int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu,
framing);
}
// delay posting reads until we're fully open
tasklet_schedule (&dev->bh);
#if defined(CONFIG_ERICSSON_F3307_ENABLE)
if (info->manage_power) {
retval = info->manage_power(dev, 1);
if (retval < 0)
goto done;
usb_autopm_put_interface(dev->intf);
}
#endif
return retval;
done:
usb_autopm_put_interface(dev->intf);
done_nopm:
return retval;
}