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USB: usbnet - Add unlink_rx_urbs() call to allow for Jumbo Frames

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Add usbnet_unlink_rx_urbs() which can be called by mini-drivers when
they change their MTU such as for Jumbo Frame support.


Signed-off-by: David Hollis <dhollis@davehollis.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jamie Painter 2006-07-27 14:17:28 -04:00 committed by Greg Kroah-Hartman
parent 9c53761681
commit a99c19492a
2 changed files with 28 additions and 3 deletions
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30
drivers/usb/net/usbnet.c
View File

@ -61,8 +61,11 @@
* let the USB host controller be busy for 5msec or more before an irq
* is required, under load. Jumbograms change the equation.
*/
#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
#define RX_MAX_QUEUE_MEMORY (60 * 1518)
#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
(RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
(RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
// reawaken network queue this soon after stopping; else watchdog barks
#define TX_TIMEOUT_JIFFIES (5*HZ)
@ -227,13 +230,23 @@ static int usbnet_change_mtu (struct net_device *net, int new_mtu)
{
struct usbnet *dev = netdev_priv(net);
int ll_mtu = new_mtu + net->hard_header_len;
int old_hard_mtu = dev->hard_mtu;
int old_rx_urb_size = dev->rx_urb_size;
if (new_mtu <= 0 || ll_mtu > dev->hard_mtu)
if (new_mtu <= 0)
return -EINVAL;
// no second zero-length packet read wanted after mtu-sized packets
if ((ll_mtu % dev->maxpacket) == 0)
return -EDOM;
net->mtu = new_mtu;
dev->hard_mtu = net->mtu + net->hard_header_len;
if (dev->rx_urb_size == old_hard_mtu) {
dev->rx_urb_size = dev->hard_mtu;
if (dev->rx_urb_size > old_rx_urb_size)
usbnet_unlink_rx_urbs(dev);
}
return 0;
}
@ -521,6 +534,17 @@ static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
return count;
}
// Flush all pending rx urbs
// minidrivers may need to do this when the MTU changes
void usbnet_unlink_rx_urbs(struct usbnet *dev)
{
if (netif_running(dev->net)) {
(void) unlink_urbs (dev, &dev->rxq);
tasklet_schedule(&dev->bh);
}
}
EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
/*-------------------------------------------------------------------------*/

1
drivers/usb/net/usbnet.h
View File

@ -166,6 +166,7 @@ struct skb_data { /* skb->cb is one of these */
extern int usbnet_get_endpoints(struct usbnet *, struct usb_interface *);
extern void usbnet_defer_kevent (struct usbnet *, int);
extern void usbnet_skb_return (struct usbnet *, struct sk_buff *);
extern void usbnet_unlink_rx_urbs(struct usbnet *);
extern u32 usbnet_get_msglevel (struct net_device *);
extern void usbnet_set_msglevel (struct net_device *, u32);