Hi Marc!
+ default:
+ netdev_info(netdev, "Rx URB aborted (%d)\n",
+ urb->status);
+ goto resubmit_urb;
+ }
+
+ while (pos < urb->actual_length) {
+ struct usb_8dev_rx_msg *msg;
+
+ if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) {
+ netdev_err(dev->netdev, "format error\n");
+ break;
is resubmitting the urb the correct way to handle this problem?
Suggestions? (maybe CAN_ERR_CRTL_UNSPEC ??)
+
+ stats->tx_dropped++;
+ }
+ } else {
+ /* Slow down tx path */
+ if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
+ dev->free_slots < 5) {
where's the 5 coming from?
From ems_usb driver.
+ netif_stop_queue(netdev);
+ }
+ }
+
+ /*
+ * Release our reference to this URB, the USB core will eventually
free
+ * it entirely.
+ */
+ usb_free_urb(urb);
+
+ return NETDEV_TX_OK;
+
+nomem:
+ dev_kfree_skb(skb);
+ stats->tx_dropped++;
+
+ return NETDEV_TX_OK;
+}
+
+static int usb_8dev_get_berr_counter(const struct net_device *netdev,
+ struct can_berr_counter *bec)
+{
+ struct usb_8dev *dev = netdev_priv(netdev);
+
+ bec->txerr = dev->bec.txerr;
+ bec->rxerr = dev->bec.rxerr;
+
+ return 0;
+}
+
+/* Start USB device */
+static int usb_8dev_start(struct usb_8dev *dev)
+{
+ struct net_device *netdev = dev->netdev;
+ int err, i;
+
+ dev->free_slots = 15; /* initial size */
there does the 15 come from?
ditto
+ * Check device and firmware.
+ * Set supported modes and bittiming constants.
+ * Allocate some memory.
+ */
+static int usb_8dev_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct net_device *netdev;
+ struct usb_8dev *dev;
+ int i, err = -ENOMEM;
+ u32 version;
+ char buf[18];
where does this 18 come from?
String "USB2CAN converter" + trailing 0.
+ struct usb_device *usbdev = interface_to_usbdev(intf);
+
+ /* product id looks strange, better we also check iProdukt string */
iProduct?
Check if usbdev->descriptor.iProduct == "USB2CAN converter".
+ if (usb_string(usbdev, usbdev->descriptor.iProduct, buf,
+ sizeof(buf)) > 0 && strcmp(buf, "USB2CAN converter")) {
+ dev_info(&usbdev->dev, "ignoring: not an USB2CAN converter\n");
+ return -ENODEV;
+ }
+
+ netdev = alloc_candev(sizeof(struct usb_8dev), MAX_TX_URBS);
+ if (!netdev) {
+ dev_err(&intf->dev, "Couldn't alloc candev\n");
+ return -ENOMEM;
+ }
+
+ dev = netdev_priv(netdev);
+
+ dev->udev = usbdev;
+ dev->netdev = netdev;
+
+ dev->can.state = CAN_STATE_STOPPED;
+ dev->can.clock.freq = USB_8DEV_ABP_CLOCK;
+ dev->can.bittiming_const = &usb_8dev_bittiming_const;
+ dev->can.do_set_mode = usb_8dev_set_mode;
+ dev->can.do_get_berr_counter = usb_8dev_get_berr_counter;
+ dev->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
+ CAN_CTRLMODE_LISTENONLY |
+ CAN_CTRLMODE_ONE_SHOT;
Have you actually tested one shot? What happens if a can frame cannot be
transmitted?
Not really. Can someone explain what one-shot exactly means and what is the
correct behavior.
I've only tested without any other device connected. I got the same errors like
in normal mode.
regards,
Bernd
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