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linux/drivers/net/usb/usbnet.c
Steve Glendinning ec47562382 smsc95xx: fix transmission where ZLP is expected 
Usbnet framework assumes USB hardware doesn't handle zero length
packets, but SMSC LAN95xx requires these to be sent for correct
operation.

This patch fixes an easily reproducible tx lockup when sending a frame
that results in exactly 512 bytes in a USB transmission (e.g. a UDP
frame with 458 data bytes, due to IP headers and our USB headers).  It
adds an extra flag to usbnet for the hardware driver to indicate that
it can handle and requires the zero length packets.

This patch should not affect other usbnet users, please also consider
for -stable.

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-22 14:28:26 -07:00

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/*
* USB Network driver infrastructure
* Copyright (C) 2000-2005 by David Brownell
* Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
*
* 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
*/
/*
* This is a generic "USB networking" framework that works with several
* kinds of full and high speed networking devices: host-to-host cables,
* smart usb peripherals, and actual Ethernet adapters.
*
* These devices usually differ in terms of control protocols (if they
* even have one!) and sometimes they define new framing to wrap or batch
* Ethernet packets. Otherwise, they talk to USB pretty much the same,
* so interface (un)binding, endpoint I/O queues, fault handling, and other
* issues can usefully be addressed by this framework.
*/
// #define DEBUG // error path messages, extra info
// #define VERBOSE // more; success messages
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ctype.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/usb/usbnet.h>
#define DRIVER_VERSION "22-Aug-2005"
/*-------------------------------------------------------------------------*/
/*
* Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
* Several dozen bytes of IPv4 data can fit in two such transactions.
* One maximum size Ethernet packet takes twenty four of them.
* For high speed, each frame comfortably fits almost 36 max size
* Ethernet packets (so queues should be bigger).
*
* REVISIT qlens should be members of 'struct usbnet'; the goal is to
* let the USB host controller be busy for 5msec or more before an irq
* is required, under load. Jumbograms change the equation.
*/
#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)
// throttle rx/tx briefly after some faults, so khubd might disconnect()
// us (it polls at HZ/4 usually) before we report too many false errors.
#define THROTTLE_JIFFIES (HZ/8)
// between wakeups
#define UNLINK_TIMEOUT_MS 3
/*-------------------------------------------------------------------------*/
// randomly generated ethernet address
static u8 node_id [ETH_ALEN];
static const char driver_name [] = "usbnet";
/* use ethtool to change the level for any given device */
static int msg_level = -1;
module_param (msg_level, int, 0);
MODULE_PARM_DESC (msg_level, "Override default message level");
/*-------------------------------------------------------------------------*/
/* handles CDC Ethernet and many other network "bulk data" interfaces */
int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
{
int tmp;
struct usb_host_interface *alt = NULL;
struct usb_host_endpoint *in = NULL, *out = NULL;
struct usb_host_endpoint *status = NULL;
for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
unsigned ep;
in = out = status = NULL;
alt = intf->altsetting + tmp;
/* take the first altsetting with in-bulk + out-bulk;
* remember any status endpoint, just in case;
* ignore other endpoints and altsetttings.
*/
for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
struct usb_host_endpoint *e;
int intr = 0;
e = alt->endpoint + ep;
switch (e->desc.bmAttributes) {
case USB_ENDPOINT_XFER_INT:
if (!usb_endpoint_dir_in(&e->desc))
continue;
intr = 1;
/* FALLTHROUGH */
case USB_ENDPOINT_XFER_BULK:
break;
default:
continue;
}
if (usb_endpoint_dir_in(&e->desc)) {
if (!intr && !in)
in = e;
else if (intr && !status)
status = e;
} else {
if (!out)
out = e;
}
}
if (in && out)
break;
}
if (!alt || !in || !out)
return -EINVAL;
if (alt->desc.bAlternateSetting != 0
|| !(dev->driver_info->flags & FLAG_NO_SETINT)) {
tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
alt->desc.bAlternateSetting);
if (tmp < 0)
return tmp;
}
dev->in = usb_rcvbulkpipe (dev->udev,
in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
dev->out = usb_sndbulkpipe (dev->udev,
out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
dev->status = status;
return 0;
}
EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
static u8 nibble(unsigned char c)
{
if (likely(isdigit(c)))
return c - '0';
c = toupper(c);
if (likely(isxdigit(c)))
return 10 + c - 'A';
return 0;
}
int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
{
int tmp, i;
unsigned char buf [13];
tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
if (tmp != 12) {
dev_dbg(&dev->udev->dev,
"bad MAC string %d fetch, %d\n", iMACAddress, tmp);
if (tmp >= 0)
tmp = -EINVAL;
return tmp;
}
for (i = tmp = 0; i < 6; i++, tmp += 2)
dev->net->dev_addr [i] =
(nibble(buf [tmp]) << 4) + nibble(buf [tmp + 1]);
return 0;
}
EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
static void intr_complete (struct urb *urb);
static int init_status (struct usbnet *dev, struct usb_interface *intf)
{
char *buf = NULL;
unsigned pipe = 0;
unsigned maxp;
unsigned period;
if (!dev->driver_info->status)
return 0;
pipe = usb_rcvintpipe (dev->udev,
dev->status->desc.bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK);
maxp = usb_maxpacket (dev->udev, pipe, 0);
/* avoid 1 msec chatter: min 8 msec poll rate */
period = max ((int) dev->status->desc.bInterval,
(dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
buf = kmalloc (maxp, GFP_KERNEL);
if (buf) {
dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
if (!dev->interrupt) {
kfree (buf);
return -ENOMEM;
} else {
usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
buf, maxp, intr_complete, dev, period);
dev_dbg(&intf->dev,
"status ep%din, %d bytes period %d\n",
usb_pipeendpoint(pipe), maxp, period);
}
}
return 0;
}
/* Passes this packet up the stack, updating its accounting.
* Some link protocols batch packets, so their rx_fixup paths
* can return clones as well as just modify the original skb.
*/
void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
{
int status;
if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
skb_queue_tail(&dev->rxq_pause, skb);
return;
}
skb->protocol = eth_type_trans (skb, dev->net);
dev->net->stats.rx_packets++;
dev->net->stats.rx_bytes += skb->len;
if (netif_msg_rx_status (dev))
devdbg (dev, "< rx, len %zu, type 0x%x",
skb->len + sizeof (struct ethhdr), skb->protocol);
memset (skb->cb, 0, sizeof (struct skb_data));
status = netif_rx (skb);
if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev))
devdbg (dev, "netif_rx status %d", status);
}
EXPORT_SYMBOL_GPL(usbnet_skb_return);
/*-------------------------------------------------------------------------
*
* Network Device Driver (peer link to "Host Device", from USB host)
*
*-------------------------------------------------------------------------*/
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)
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;
}
EXPORT_SYMBOL_GPL(usbnet_change_mtu);
/*-------------------------------------------------------------------------*/
/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
* completion callbacks. 2.5 should have fixed those bugs...
*/
static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
{
unsigned long flags;
spin_lock_irqsave(&list->lock, flags);
__skb_unlink(skb, list);
spin_unlock(&list->lock);
spin_lock(&dev->done.lock);
__skb_queue_tail(&dev->done, skb);
if (dev->done.qlen == 1)
tasklet_schedule(&dev->bh);
spin_unlock_irqrestore(&dev->done.lock, flags);
}
/* some work can't be done in tasklets, so we use keventd
*
* NOTE: annoying asymmetry: if it's active, schedule_work() fails,
* but tasklet_schedule() doesn't. hope the failure is rare.
*/
void usbnet_defer_kevent (struct usbnet *dev, int work)
{
set_bit (work, &dev->flags);
if (!schedule_work (&dev->kevent))
deverr (dev, "kevent %d may have been dropped", work);
else
devdbg (dev, "kevent %d scheduled", work);
}
EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
/*-------------------------------------------------------------------------*/
static void rx_complete (struct urb *urb);
static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
{
struct sk_buff *skb;
struct skb_data *entry;
int retval = 0;
unsigned long lockflags;
size_t size = dev->rx_urb_size;
if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
if (netif_msg_rx_err (dev))
devdbg (dev, "no rx skb");
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
usb_free_urb (urb);
return;
}
skb_reserve (skb, NET_IP_ALIGN);
entry = (struct skb_data *) skb->cb;
entry->urb = urb;
entry->dev = dev;
entry->state = rx_start;
entry->length = 0;
usb_fill_bulk_urb (urb, dev->udev, dev->in,
skb->data, size, rx_complete, skb);
spin_lock_irqsave (&dev->rxq.lock, lockflags);
if (netif_running (dev->net)
&& netif_device_present (dev->net)
&& !test_bit (EVENT_RX_HALT, &dev->flags)) {
switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
case -EPIPE:
usbnet_defer_kevent (dev, EVENT_RX_HALT);
break;
case -ENOMEM:
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
break;
case -ENODEV:
if (netif_msg_ifdown (dev))
devdbg (dev, "device gone");
netif_device_detach (dev->net);
break;
default:
if (netif_msg_rx_err (dev))
devdbg (dev, "rx submit, %d", retval);
tasklet_schedule (&dev->bh);
break;
case 0:
__skb_queue_tail (&dev->rxq, skb);
}
} else {
if (netif_msg_ifdown (dev))
devdbg (dev, "rx: stopped");
retval = -ENOLINK;
}
spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
if (retval) {
dev_kfree_skb_any (skb);
usb_free_urb (urb);
}
}
/*-------------------------------------------------------------------------*/
static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
{
if (dev->driver_info->rx_fixup
&& !dev->driver_info->rx_fixup (dev, skb))
goto error;
// else network stack removes extra byte if we forced a short packet
if (skb->len)
usbnet_skb_return (dev, skb);
else {
if (netif_msg_rx_err (dev))
devdbg (dev, "drop");
error:
dev->net->stats.rx_errors++;
skb_queue_tail (&dev->done, skb);
}
}
/*-------------------------------------------------------------------------*/
static void rx_complete (struct urb *urb)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct skb_data *entry = (struct skb_data *) skb->cb;
struct usbnet *dev = entry->dev;
int urb_status = urb->status;
skb_put (skb, urb->actual_length);
entry->state = rx_done;
entry->urb = NULL;
switch (urb_status) {
/* success */
case 0:
if (skb->len < dev->net->hard_header_len) {
entry->state = rx_cleanup;
dev->net->stats.rx_errors++;
dev->net->stats.rx_length_errors++;
if (netif_msg_rx_err (dev))
devdbg (dev, "rx length %d", skb->len);
}
break;
/* stalls need manual reset. this is rare ... except that
* when going through USB 2.0 TTs, unplug appears this way.
* we avoid the highspeed version of the ETIMEDOUT/EILSEQ
* storm, recovering as needed.
*/
case -EPIPE:
dev->net->stats.rx_errors++;
usbnet_defer_kevent (dev, EVENT_RX_HALT);
// FALLTHROUGH
/* software-driven interface shutdown */
case -ECONNRESET: /* async unlink */
case -ESHUTDOWN: /* hardware gone */
if (netif_msg_ifdown (dev))
devdbg (dev, "rx shutdown, code %d", urb_status);
goto block;
/* we get controller i/o faults during khubd disconnect() delays.
* throttle down resubmits, to avoid log floods; just temporarily,
* so we still recover when the fault isn't a khubd delay.
*/
case -EPROTO:
case -ETIME:
case -EILSEQ:
dev->net->stats.rx_errors++;
if (!timer_pending (&dev->delay)) {
mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
if (netif_msg_link (dev))
devdbg (dev, "rx throttle %d", urb_status);
}
block:
entry->state = rx_cleanup;
entry->urb = urb;
urb = NULL;
break;
/* data overrun ... flush fifo? */
case -EOVERFLOW:
dev->net->stats.rx_over_errors++;
// FALLTHROUGH
default:
entry->state = rx_cleanup;
dev->net->stats.rx_errors++;
if (netif_msg_rx_err (dev))
devdbg (dev, "rx status %d", urb_status);
break;
}
defer_bh(dev, skb, &dev->rxq);
if (urb) {
if (netif_running (dev->net)
&& !test_bit (EVENT_RX_HALT, &dev->flags)) {
rx_submit (dev, urb, GFP_ATOMIC);
return;
}
usb_free_urb (urb);
}
if (netif_msg_rx_err (dev))
devdbg (dev, "no read resubmitted");
}
static void intr_complete (struct urb *urb)
{
struct usbnet *dev = urb->context;
int status = urb->status;
switch (status) {
/* success */
case 0:
dev->driver_info->status(dev, urb);
break;
/* software-driven interface shutdown */
case -ENOENT: /* urb killed */
case -ESHUTDOWN: /* hardware gone */
if (netif_msg_ifdown (dev))
devdbg (dev, "intr shutdown, code %d", status);
return;
/* NOTE: not throttling like RX/TX, since this endpoint
* already polls infrequently
*/
default:
devdbg (dev, "intr status %d", status);
break;
}
if (!netif_running (dev->net))
return;
memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
status = usb_submit_urb (urb, GFP_ATOMIC);
if (status != 0 && netif_msg_timer (dev))
deverr(dev, "intr resubmit --> %d", status);
}
/*-------------------------------------------------------------------------*/
void usbnet_pause_rx(struct usbnet *dev)
{
set_bit(EVENT_RX_PAUSED, &dev->flags);
if (netif_msg_rx_status(dev))
devdbg(dev, "paused rx queue enabled");
}
EXPORT_SYMBOL_GPL(usbnet_pause_rx);
void usbnet_resume_rx(struct usbnet *dev)
{
struct sk_buff *skb;
int num = 0;
clear_bit(EVENT_RX_PAUSED, &dev->flags);
while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
usbnet_skb_return(dev, skb);
num++;
}
tasklet_schedule(&dev->bh);
if (netif_msg_rx_status(dev))
devdbg(dev, "paused rx queue disabled, %d skbs requeued", num);
}
EXPORT_SYMBOL_GPL(usbnet_resume_rx);
void usbnet_purge_paused_rxq(struct usbnet *dev)
{
skb_queue_purge(&dev->rxq_pause);
}
EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
/*-------------------------------------------------------------------------*/
// unlink pending rx/tx; completion handlers do all other cleanup
static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
{
unsigned long flags;
struct sk_buff *skb, *skbnext;
int count = 0;
spin_lock_irqsave (&q->lock, flags);
skb_queue_walk_safe(q, skb, skbnext) {
struct skb_data *entry;
struct urb *urb;
int retval;
entry = (struct skb_data *) skb->cb;
urb = entry->urb;
// during some PM-driven resume scenarios,
// these (async) unlinks complete immediately
retval = usb_unlink_urb (urb);
if (retval != -EINPROGRESS && retval != 0)
devdbg (dev, "unlink urb err, %d", retval);
else
count++;
}
spin_unlock_irqrestore (&q->lock, flags);
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);
/*-------------------------------------------------------------------------*/
// precondition: never called in_interrupt
int usbnet_stop (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
struct driver_info *info = dev->driver_info;
int temp;
int retval;
DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup);
DECLARE_WAITQUEUE (wait, current);
netif_stop_queue (net);
if (netif_msg_ifdown (dev))
devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
net->stats.rx_packets, net->stats.tx_packets,
net->stats.rx_errors, net->stats.tx_errors
);
/* allow minidriver to stop correctly (wireless devices to turn off
* radio etc) */
if (info->stop) {
retval = info->stop(dev);
if (retval < 0 && netif_msg_ifdown(dev))
devinfo(dev,
"stop fail (%d) usbnet usb-%s-%s, %s",
retval,
dev->udev->bus->bus_name, dev->udev->devpath,
info->description);
}
if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) {
/* ensure there are no more active urbs */
add_wait_queue(&unlink_wakeup, &wait);
dev->wait = &unlink_wakeup;
temp = unlink_urbs(dev, &dev->txq) +
unlink_urbs(dev, &dev->rxq);
/* maybe wait for deletions to finish. */
while (!skb_queue_empty(&dev->rxq)
&& !skb_queue_empty(&dev->txq)
&& !skb_queue_empty(&dev->done)) {
msleep(UNLINK_TIMEOUT_MS);
if (netif_msg_ifdown(dev))
devdbg(dev, "waited for %d urb completions",
temp);
}
dev->wait = NULL;
remove_wait_queue(&unlink_wakeup, &wait);
}
usb_kill_urb(dev->interrupt);
usbnet_purge_paused_rxq(dev);
/* deferred work (task, timer, softirq) must also stop.
* can't flush_scheduled_work() until we drop rtnl (later),
* else workers could deadlock; so make workers a NOP.
*/
dev->flags = 0;
del_timer_sync (&dev->delay);
tasklet_kill (&dev->bh);
usb_autopm_put_interface(dev->intf);
return 0;
}
EXPORT_SYMBOL_GPL(usbnet_stop);
/*-------------------------------------------------------------------------*/
// posts reads, and enables write queuing
// precondition: never called in_interrupt
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);
return retval;
done:
usb_autopm_put_interface(dev->intf);
done_nopm:
return retval;
}
EXPORT_SYMBOL_GPL(usbnet_open);
/*-------------------------------------------------------------------------*/
/* ethtool methods; minidrivers may need to add some more, but
* they'll probably want to use this base set.
*/
int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
{
struct usbnet *dev = netdev_priv(net);
if (!dev->mii.mdio_read)
return -EOPNOTSUPP;
return mii_ethtool_gset(&dev->mii, cmd);
}
EXPORT_SYMBOL_GPL(usbnet_get_settings);
int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
{
struct usbnet *dev = netdev_priv(net);
int retval;
if (!dev->mii.mdio_write)
return -EOPNOTSUPP;
retval = mii_ethtool_sset(&dev->mii, cmd);
/* link speed/duplex might have changed */
if (dev->driver_info->link_reset)
dev->driver_info->link_reset(dev);
return retval;
}
EXPORT_SYMBOL_GPL(usbnet_set_settings);
u32 usbnet_get_link (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
/* If a check_connect is defined, return its result */
if (dev->driver_info->check_connect)
return dev->driver_info->check_connect (dev) == 0;
/* if the device has mii operations, use those */
if (dev->mii.mdio_read)
return mii_link_ok(&dev->mii);
/* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
return ethtool_op_get_link(net);
}
EXPORT_SYMBOL_GPL(usbnet_get_link);
int usbnet_nway_reset(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
if (!dev->mii.mdio_write)
return -EOPNOTSUPP;
return mii_nway_restart(&dev->mii);
}
EXPORT_SYMBOL_GPL(usbnet_nway_reset);
void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
{
struct usbnet *dev = netdev_priv(net);
strncpy (info->driver, dev->driver_name, sizeof info->driver);
strncpy (info->version, DRIVER_VERSION, sizeof info->version);
strncpy (info->fw_version, dev->driver_info->description,
sizeof info->fw_version);
usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
}
EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
u32 usbnet_get_msglevel (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
return dev->msg_enable;
}
EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
void usbnet_set_msglevel (struct net_device *net, u32 level)
{
struct usbnet *dev = netdev_priv(net);
dev->msg_enable = level;
}
EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
/* drivers may override default ethtool_ops in their bind() routine */
static const struct ethtool_ops usbnet_ethtool_ops = {
.get_settings = usbnet_get_settings,
.set_settings = usbnet_set_settings,
.get_link = usbnet_get_link,
.nway_reset = usbnet_nway_reset,
.get_drvinfo = usbnet_get_drvinfo,
.get_msglevel = usbnet_get_msglevel,
.set_msglevel = usbnet_set_msglevel,
};
/*-------------------------------------------------------------------------*/
/* work that cannot be done in interrupt context uses keventd.
*
* NOTE: with 2.5 we could do more of this using completion callbacks,
* especially now that control transfers can be queued.
*/
static void
kevent (struct work_struct *work)
{
struct usbnet *dev =
container_of(work, struct usbnet, kevent);
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);
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)) < 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);
}
/*-------------------------------------------------------------------------*/
static void tx_complete (struct urb *urb)
{
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->net->stats.tx_packets++;
dev->net->stats.tx_bytes += entry->length;
} else {
dev->net->stats.tx_errors++;
switch (urb->status) {
case -EPIPE:
usbnet_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);
}
/*-------------------------------------------------------------------------*/
void usbnet_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?
}
EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
/*-------------------------------------------------------------------------*/
netdev_tx_t usbnet_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;
if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
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);
usbnet_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->net->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;
}
EXPORT_SYMBOL_GPL(usbnet_start_xmit);
/*-------------------------------------------------------------------------*/
// tasklet (work deferred from completions, in_irq) or timer
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:
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)
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
void usbnet_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);
}
EXPORT_SYMBOL_GPL(usbnet_disconnect);
static const struct net_device_ops usbnet_netdev_ops = {
.ndo_open = usbnet_open,
.ndo_stop = usbnet_stop,
.ndo_start_xmit = usbnet_start_xmit,
.ndo_tx_timeout = usbnet_tx_timeout,
.ndo_change_mtu = usbnet_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
};
/*-------------------------------------------------------------------------*/
// precondition: never called in_interrupt
int
usbnet_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) {
dev_dbg (&udev->dev, "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) {
dbg ("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);
skb_queue_head_init(&dev->rxq_pause);
dev->bh.func = usbnet_bh;
dev->bh.data = (unsigned long) dev;
INIT_WORK (&dev->kevent, kevent);
dev->delay.function = usbnet_bh;
dev->delay.data = (unsigned long) dev;
init_timer (&dev->delay);
mutex_init (&dev->phy_mutex);
dev->net = net;
strcpy (net->name, "usb%d");
memcpy (net->dev_addr, node_id, sizeof node_id);
/* 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
net->netdev_ops = &usbnet_netdev_ops;
net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
net->ethtool_ops = &usbnet_ethtool_ops;
// allow device-specific bind/init procedures
// NOTE net->name still not usable ...
if (info->bind) {
status = info->bind (dev, udev);
if (status < 0)
goto out1;
// heuristic: "usb%d" for links we know are two-host,
// else "eth%d" when there's reasonable doubt. userspace
// can rename the link if it knows better.
if ((dev->driver_info->flags & FLAG_ETHER) != 0
&& (net->dev_addr [0] & 0x02) == 0)
strcpy (net->name, "eth%d");
/* WLAN devices should always be named "wlan%d" */
if ((dev->driver_info->flags & FLAG_WLAN) != 0)
strcpy(net->name, "wlan%d");
/* 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;
} else if (!info->in || !info->out)
status = usbnet_get_endpoints (dev, udev);
else {
dev->in = usb_rcvbulkpipe (xdev, info->in);
dev->out = usb_sndbulkpipe (xdev, info->out);
if (!(info->flags & FLAG_NO_SETINT))
status = usb_set_interface (xdev,
interface->desc.bInterfaceNumber,
interface->desc.bAlternateSetting);
else
status = 0;
}
if (status >= 0 && dev->status)
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)
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;
}
EXPORT_SYMBOL_GPL(usbnet_probe);
/*-------------------------------------------------------------------------*/
/*
* suspend the whole driver as soon as the first interface is suspended
* resume only when the last interface is resumed
*/
int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
{
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);
/*
* reattach so runtime management can use and
* wake the device
*/
netif_device_attach (dev->net);
}
return 0;
}
EXPORT_SYMBOL_GPL(usbnet_suspend);
int usbnet_resume (struct usb_interface *intf)
{
struct usbnet *dev = usb_get_intfdata(intf);
if (!--dev->suspend_count)
tasklet_schedule (&dev->bh);
return 0;
}
EXPORT_SYMBOL_GPL(usbnet_resume);
/*-------------------------------------------------------------------------*/
static int __init usbnet_init(void)
{
/* compiler should optimize this out */
BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
< sizeof (struct skb_data));
random_ether_addr(node_id);
return 0;
}
module_init(usbnet_init);
static void __exit usbnet_exit(void)
{
}
module_exit(usbnet_exit);
MODULE_AUTHOR("David Brownell");
MODULE_DESCRIPTION("USB network driver framework");
MODULE_LICENSE("GPL");
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