2072 строки
54 KiB
C
2072 строки
54 KiB
C
/*
|
||
* 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, see <http://www.gnu.org/licenses/>.
|
||
*/
|
||
|
||
/*
|
||
* 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>
|
||
#include <linux/slab.h>
|
||
#include <linux/kernel.h>
|
||
#include <linux/pm_runtime.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).
|
||
*
|
||
* 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 MAX_QUEUE_MEMORY (60 * 1518)
|
||
#define RX_QLEN(dev) ((dev)->rx_qlen)
|
||
#define TX_QLEN(dev) ((dev)->tx_qlen)
|
||
|
||
// 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 altsettings.
|
||
*/
|
||
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);
|
||
|
||
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] =
|
||
(hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
|
||
|
||
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 */
|
||
netif_dbg(dev, ifdown, dev->net,
|
||
"intr shutdown, code %d\n", status);
|
||
return;
|
||
|
||
/* NOTE: not throttling like RX/TX, since this endpoint
|
||
* already polls infrequently
|
||
*/
|
||
default:
|
||
netdev_dbg(dev->net, "intr status %d\n", status);
|
||
break;
|
||
}
|
||
|
||
status = usb_submit_urb (urb, GFP_ATOMIC);
|
||
if (status != 0)
|
||
netif_err(dev, timer, dev->net,
|
||
"intr resubmit --> %d\n", status);
|
||
}
|
||
|
||
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->interrupt->transfer_flags |= URB_FREE_BUFFER;
|
||
dev_dbg(&intf->dev,
|
||
"status ep%din, %d bytes period %d\n",
|
||
usb_pipeendpoint(pipe), maxp, period);
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Submit the interrupt URB if not previously submitted, increasing refcount */
|
||
int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
|
||
{
|
||
int ret = 0;
|
||
|
||
WARN_ON_ONCE(dev->interrupt == NULL);
|
||
if (dev->interrupt) {
|
||
mutex_lock(&dev->interrupt_mutex);
|
||
|
||
if (++dev->interrupt_count == 1)
|
||
ret = usb_submit_urb(dev->interrupt, mem_flags);
|
||
|
||
dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
|
||
dev->interrupt_count);
|
||
mutex_unlock(&dev->interrupt_mutex);
|
||
}
|
||
return ret;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_status_start);
|
||
|
||
/* For resume; submit interrupt URB if previously submitted */
|
||
static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
|
||
{
|
||
int ret = 0;
|
||
|
||
mutex_lock(&dev->interrupt_mutex);
|
||
if (dev->interrupt_count) {
|
||
ret = usb_submit_urb(dev->interrupt, mem_flags);
|
||
dev_dbg(&dev->udev->dev,
|
||
"submitted interrupt URB for resume\n");
|
||
}
|
||
mutex_unlock(&dev->interrupt_mutex);
|
||
return ret;
|
||
}
|
||
|
||
/* Kill the interrupt URB if all submitters want it killed */
|
||
void usbnet_status_stop(struct usbnet *dev)
|
||
{
|
||
if (dev->interrupt) {
|
||
mutex_lock(&dev->interrupt_mutex);
|
||
WARN_ON(dev->interrupt_count == 0);
|
||
|
||
if (dev->interrupt_count && --dev->interrupt_count == 0)
|
||
usb_kill_urb(dev->interrupt);
|
||
|
||
dev_dbg(&dev->udev->dev,
|
||
"decremented interrupt URB count to %d\n",
|
||
dev->interrupt_count);
|
||
mutex_unlock(&dev->interrupt_mutex);
|
||
}
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_status_stop);
|
||
|
||
/* For suspend; always kill interrupt URB */
|
||
static void __usbnet_status_stop_force(struct usbnet *dev)
|
||
{
|
||
if (dev->interrupt) {
|
||
mutex_lock(&dev->interrupt_mutex);
|
||
usb_kill_urb(dev->interrupt);
|
||
dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
|
||
mutex_unlock(&dev->interrupt_mutex);
|
||
}
|
||
}
|
||
|
||
/* 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;
|
||
|
||
netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
|
||
skb->len + sizeof (struct ethhdr), skb->protocol);
|
||
memset (skb->cb, 0, sizeof (struct skb_data));
|
||
|
||
if (skb_defer_rx_timestamp(skb))
|
||
return;
|
||
|
||
status = netif_rx (skb);
|
||
if (status != NET_RX_SUCCESS)
|
||
netif_dbg(dev, rx_err, dev->net,
|
||
"netif_rx status %d\n", status);
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_skb_return);
|
||
|
||
/* must be called if hard_mtu or rx_urb_size changed */
|
||
void usbnet_update_max_qlen(struct usbnet *dev)
|
||
{
|
||
enum usb_device_speed speed = dev->udev->speed;
|
||
|
||
switch (speed) {
|
||
case USB_SPEED_HIGH:
|
||
dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
|
||
dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
|
||
break;
|
||
case USB_SPEED_SUPER:
|
||
/*
|
||
* Not take default 5ms qlen for super speed HC to
|
||
* save memory, and iperf tests show 2.5ms qlen can
|
||
* work well
|
||
*/
|
||
dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
|
||
dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
|
||
break;
|
||
default:
|
||
dev->rx_qlen = dev->tx_qlen = 4;
|
||
}
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
|
||
|
||
|
||
/*-------------------------------------------------------------------------
|
||
*
|
||
* 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);
|
||
}
|
||
|
||
/* max qlen depend on hard_mtu and rx_urb_size */
|
||
usbnet_update_max_qlen(dev);
|
||
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_change_mtu);
|
||
|
||
/* The caller must hold list->lock */
|
||
static void __usbnet_queue_skb(struct sk_buff_head *list,
|
||
struct sk_buff *newsk, enum skb_state state)
|
||
{
|
||
struct skb_data *entry = (struct skb_data *) newsk->cb;
|
||
|
||
__skb_queue_tail(list, newsk);
|
||
entry->state = state;
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
|
||
* completion callbacks. 2.5 should have fixed those bugs...
|
||
*/
|
||
|
||
static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
|
||
struct sk_buff_head *list, enum skb_state state)
|
||
{
|
||
unsigned long flags;
|
||
enum skb_state old_state;
|
||
struct skb_data *entry = (struct skb_data *) skb->cb;
|
||
|
||
spin_lock_irqsave(&list->lock, flags);
|
||
old_state = entry->state;
|
||
entry->state = state;
|
||
__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);
|
||
return old_state;
|
||
}
|
||
|
||
/* 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)) {
|
||
if (net_ratelimit())
|
||
netdev_err(dev->net, "kevent %d may have been dropped\n", work);
|
||
} else {
|
||
netdev_dbg(dev->net, "kevent %d scheduled\n", work);
|
||
}
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static void rx_complete (struct urb *urb);
|
||
|
||
static int 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;
|
||
|
||
/* prevent rx skb allocation when error ratio is high */
|
||
if (test_bit(EVENT_RX_KILL, &dev->flags)) {
|
||
usb_free_urb(urb);
|
||
return -ENOLINK;
|
||
}
|
||
|
||
skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
|
||
if (!skb) {
|
||
netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
|
||
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
|
||
usb_free_urb (urb);
|
||
return -ENOMEM;
|
||
}
|
||
|
||
entry = (struct skb_data *) skb->cb;
|
||
entry->urb = urb;
|
||
entry->dev = dev;
|
||
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) &&
|
||
!test_bit (EVENT_DEV_ASLEEP, &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:
|
||
netif_dbg(dev, ifdown, dev->net, "device gone\n");
|
||
netif_device_detach (dev->net);
|
||
break;
|
||
case -EHOSTUNREACH:
|
||
retval = -ENOLINK;
|
||
break;
|
||
default:
|
||
netif_dbg(dev, rx_err, dev->net,
|
||
"rx submit, %d\n", retval);
|
||
tasklet_schedule (&dev->bh);
|
||
break;
|
||
case 0:
|
||
__usbnet_queue_skb(&dev->rxq, skb, rx_start);
|
||
}
|
||
} else {
|
||
netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
|
||
retval = -ENOLINK;
|
||
}
|
||
spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
|
||
if (retval) {
|
||
dev_kfree_skb_any (skb);
|
||
usb_free_urb (urb);
|
||
}
|
||
return retval;
|
||
}
|
||
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
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)) {
|
||
/* With RX_ASSEMBLE, rx_fixup() must update counters */
|
||
if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
|
||
dev->net->stats.rx_errors++;
|
||
goto done;
|
||
}
|
||
// else network stack removes extra byte if we forced a short packet
|
||
|
||
if (skb->len) {
|
||
/* all data was already cloned from skb inside the driver */
|
||
if (dev->driver_info->flags & FLAG_MULTI_PACKET)
|
||
dev_kfree_skb_any(skb);
|
||
else
|
||
usbnet_skb_return(dev, skb);
|
||
return;
|
||
}
|
||
|
||
netif_dbg(dev, rx_err, dev->net, "drop\n");
|
||
dev->net->stats.rx_errors++;
|
||
done:
|
||
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;
|
||
enum skb_state state;
|
||
|
||
skb_put (skb, urb->actual_length);
|
||
state = rx_done;
|
||
entry->urb = NULL;
|
||
|
||
switch (urb_status) {
|
||
/* success */
|
||
case 0:
|
||
if (skb->len < dev->net->hard_header_len) {
|
||
state = rx_cleanup;
|
||
dev->net->stats.rx_errors++;
|
||
dev->net->stats.rx_length_errors++;
|
||
netif_dbg(dev, rx_err, dev->net,
|
||
"rx length %d\n", 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 */
|
||
netif_dbg(dev, ifdown, dev->net,
|
||
"rx shutdown, code %d\n", 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);
|
||
netif_dbg(dev, link, dev->net,
|
||
"rx throttle %d\n", urb_status);
|
||
}
|
||
block:
|
||
state = rx_cleanup;
|
||
entry->urb = urb;
|
||
urb = NULL;
|
||
break;
|
||
|
||
/* data overrun ... flush fifo? */
|
||
case -EOVERFLOW:
|
||
dev->net->stats.rx_over_errors++;
|
||
// FALLTHROUGH
|
||
|
||
default:
|
||
state = rx_cleanup;
|
||
dev->net->stats.rx_errors++;
|
||
netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
|
||
break;
|
||
}
|
||
|
||
/* stop rx if packet error rate is high */
|
||
if (++dev->pkt_cnt > 30) {
|
||
dev->pkt_cnt = 0;
|
||
dev->pkt_err = 0;
|
||
} else {
|
||
if (state == rx_cleanup)
|
||
dev->pkt_err++;
|
||
if (dev->pkt_err > 20)
|
||
set_bit(EVENT_RX_KILL, &dev->flags);
|
||
}
|
||
|
||
state = defer_bh(dev, skb, &dev->rxq, state);
|
||
|
||
if (urb) {
|
||
if (netif_running (dev->net) &&
|
||
!test_bit (EVENT_RX_HALT, &dev->flags) &&
|
||
state != unlink_start) {
|
||
rx_submit (dev, urb, GFP_ATOMIC);
|
||
usb_mark_last_busy(dev->udev);
|
||
return;
|
||
}
|
||
usb_free_urb (urb);
|
||
}
|
||
netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
void usbnet_pause_rx(struct usbnet *dev)
|
||
{
|
||
set_bit(EVENT_RX_PAUSED, &dev->flags);
|
||
|
||
netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
|
||
}
|
||
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);
|
||
|
||
netif_dbg(dev, rx_status, dev->net,
|
||
"paused rx queue disabled, %d skbs requeued\n", 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;
|
||
int count = 0;
|
||
|
||
spin_lock_irqsave (&q->lock, flags);
|
||
while (!skb_queue_empty(q)) {
|
||
struct skb_data *entry;
|
||
struct urb *urb;
|
||
int retval;
|
||
|
||
skb_queue_walk(q, skb) {
|
||
entry = (struct skb_data *) skb->cb;
|
||
if (entry->state != unlink_start)
|
||
goto found;
|
||
}
|
||
break;
|
||
found:
|
||
entry->state = unlink_start;
|
||
urb = entry->urb;
|
||
|
||
/*
|
||
* Get reference count of the URB to avoid it to be
|
||
* freed during usb_unlink_urb, which may trigger
|
||
* use-after-free problem inside usb_unlink_urb since
|
||
* usb_unlink_urb is always racing with .complete
|
||
* handler(include defer_bh).
|
||
*/
|
||
usb_get_urb(urb);
|
||
spin_unlock_irqrestore(&q->lock, flags);
|
||
// during some PM-driven resume scenarios,
|
||
// these (async) unlinks complete immediately
|
||
retval = usb_unlink_urb (urb);
|
||
if (retval != -EINPROGRESS && retval != 0)
|
||
netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
|
||
else
|
||
count++;
|
||
usb_put_urb(urb);
|
||
spin_lock_irqsave(&q->lock, flags);
|
||
}
|
||
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
|
||
static void usbnet_terminate_urbs(struct usbnet *dev)
|
||
{
|
||
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
|
||
DECLARE_WAITQUEUE(wait, current);
|
||
int temp;
|
||
|
||
/* ensure there are no more active urbs */
|
||
add_wait_queue(&unlink_wakeup, &wait);
|
||
set_current_state(TASK_UNINTERRUPTIBLE);
|
||
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)) {
|
||
schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
|
||
set_current_state(TASK_UNINTERRUPTIBLE);
|
||
netif_dbg(dev, ifdown, dev->net,
|
||
"waited for %d urb completions\n", temp);
|
||
}
|
||
set_current_state(TASK_RUNNING);
|
||
dev->wait = NULL;
|
||
remove_wait_queue(&unlink_wakeup, &wait);
|
||
}
|
||
|
||
int usbnet_stop (struct net_device *net)
|
||
{
|
||
struct usbnet *dev = netdev_priv(net);
|
||
struct driver_info *info = dev->driver_info;
|
||
int retval;
|
||
|
||
clear_bit(EVENT_DEV_OPEN, &dev->flags);
|
||
netif_stop_queue (net);
|
||
|
||
netif_info(dev, ifdown, dev->net,
|
||
"stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
|
||
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_info(dev, ifdown, dev->net,
|
||
"stop fail (%d) usbnet usb-%s-%s, %s\n",
|
||
retval,
|
||
dev->udev->bus->bus_name, dev->udev->devpath,
|
||
info->description);
|
||
}
|
||
|
||
if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
|
||
usbnet_terminate_urbs(dev);
|
||
|
||
usbnet_status_stop(dev);
|
||
|
||
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);
|
||
if (info->manage_power &&
|
||
!test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags))
|
||
info->manage_power(dev, 0);
|
||
else
|
||
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) {
|
||
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;
|
||
}
|
||
|
||
/* hard_mtu or rx_urb_size may change in reset() */
|
||
usbnet_update_max_qlen(dev);
|
||
|
||
// 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 = usbnet_status_start(dev, GFP_KERNEL);
|
||
if (retval < 0) {
|
||
netif_err(dev, ifup, dev->net,
|
||
"intr submit %d\n", retval);
|
||
goto done;
|
||
}
|
||
}
|
||
|
||
set_bit(EVENT_DEV_OPEN, &dev->flags);
|
||
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");
|
||
|
||
/* reset rx error state */
|
||
dev->pkt_cnt = 0;
|
||
dev->pkt_err = 0;
|
||
clear_bit(EVENT_RX_KILL, &dev->flags);
|
||
|
||
// 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) {
|
||
retval = 0;
|
||
set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
|
||
} else {
|
||
usb_autopm_put_interface(dev->intf);
|
||
}
|
||
}
|
||
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);
|
||
|
||
/* hard_mtu or rx_urb_size may change in link_reset() */
|
||
usbnet_update_max_qlen(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);
|
||
|
||
strlcpy (info->driver, dev->driver_name, sizeof info->driver);
|
||
strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
|
||
strlcpy (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,
|
||
.get_ts_info = ethtool_op_get_ts_info,
|
||
};
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static void __handle_link_change(struct usbnet *dev)
|
||
{
|
||
if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
|
||
return;
|
||
|
||
if (!netif_carrier_ok(dev->net)) {
|
||
/* kill URBs for reading packets to save bus bandwidth */
|
||
unlink_urbs(dev, &dev->rxq);
|
||
|
||
/*
|
||
* tx_timeout will unlink URBs for sending packets and
|
||
* tx queue is stopped by netcore after link becomes off
|
||
*/
|
||
} else {
|
||
/* submitting URBs for reading packets */
|
||
tasklet_schedule(&dev->bh);
|
||
}
|
||
|
||
/* hard_mtu or rx_urb_size may change during link change */
|
||
usbnet_update_max_qlen(dev);
|
||
|
||
clear_bit(EVENT_LINK_CHANGE, &dev->flags);
|
||
}
|
||
|
||
/* 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_autopm_get_interface(dev->intf);
|
||
if (status < 0)
|
||
goto fail_pipe;
|
||
status = usb_clear_halt (dev->udev, dev->out);
|
||
usb_autopm_put_interface(dev->intf);
|
||
if (status < 0 &&
|
||
status != -EPIPE &&
|
||
status != -ESHUTDOWN) {
|
||
if (netif_msg_tx_err (dev))
|
||
fail_pipe:
|
||
netdev_err(dev->net, "can't clear tx halt, status %d\n",
|
||
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_autopm_get_interface(dev->intf);
|
||
if (status < 0)
|
||
goto fail_halt;
|
||
status = usb_clear_halt (dev->udev, dev->in);
|
||
usb_autopm_put_interface(dev->intf);
|
||
if (status < 0 &&
|
||
status != -EPIPE &&
|
||
status != -ESHUTDOWN) {
|
||
if (netif_msg_rx_err (dev))
|
||
fail_halt:
|
||
netdev_err(dev->net, "can't clear rx halt, status %d\n",
|
||
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;
|
||
int resched = 1;
|
||
|
||
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);
|
||
status = usb_autopm_get_interface(dev->intf);
|
||
if (status < 0) {
|
||
usb_free_urb(urb);
|
||
goto fail_lowmem;
|
||
}
|
||
if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
|
||
resched = 0;
|
||
usb_autopm_put_interface(dev->intf);
|
||
fail_lowmem:
|
||
if (resched)
|
||
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);
|
||
status = usb_autopm_get_interface(dev->intf);
|
||
if (status < 0)
|
||
goto skip_reset;
|
||
if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
|
||
usb_autopm_put_interface(dev->intf);
|
||
skip_reset:
|
||
netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
|
||
retval,
|
||
dev->udev->bus->bus_name,
|
||
dev->udev->devpath,
|
||
info->description);
|
||
} else {
|
||
usb_autopm_put_interface(dev->intf);
|
||
}
|
||
|
||
/* handle link change from link resetting */
|
||
__handle_link_change(dev);
|
||
}
|
||
|
||
if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
|
||
__handle_link_change(dev);
|
||
|
||
if (dev->flags)
|
||
netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", 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) {
|
||
if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
|
||
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:
|
||
usb_mark_last_busy(dev->udev);
|
||
if (!timer_pending (&dev->delay)) {
|
||
mod_timer (&dev->delay,
|
||
jiffies + THROTTLE_JIFFIES);
|
||
netif_dbg(dev, link, dev->net,
|
||
"tx throttle %d\n", urb->status);
|
||
}
|
||
netif_stop_queue (dev->net);
|
||
break;
|
||
default:
|
||
netif_dbg(dev, tx_err, dev->net,
|
||
"tx err %d\n", entry->urb->status);
|
||
break;
|
||
}
|
||
}
|
||
|
||
usb_autopm_put_interface_async(dev->intf);
|
||
(void) defer_bh(dev, skb, &dev->txq, tx_done);
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
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);
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
|
||
{
|
||
unsigned num_sgs, total_len = 0;
|
||
int i, s = 0;
|
||
|
||
num_sgs = skb_shinfo(skb)->nr_frags + 1;
|
||
if (num_sgs == 1)
|
||
return 0;
|
||
|
||
/* reserve one for zero packet */
|
||
urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
|
||
GFP_ATOMIC);
|
||
if (!urb->sg)
|
||
return -ENOMEM;
|
||
|
||
urb->num_sgs = num_sgs;
|
||
sg_init_table(urb->sg, urb->num_sgs + 1);
|
||
|
||
sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
|
||
total_len += skb_headlen(skb);
|
||
|
||
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
||
struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
|
||
|
||
total_len += skb_frag_size(f);
|
||
sg_set_page(&urb->sg[i + s], f->page.p, f->size,
|
||
f->page_offset);
|
||
}
|
||
urb->transfer_buffer_length = total_len;
|
||
|
||
return 1;
|
||
}
|
||
|
||
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;
|
||
|
||
if (skb)
|
||
skb_tx_timestamp(skb);
|
||
|
||
// 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) {
|
||
/* packet collected; minidriver waiting for more */
|
||
if (info->flags & FLAG_MULTI_PACKET)
|
||
goto not_drop;
|
||
netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
|
||
goto drop;
|
||
}
|
||
}
|
||
|
||
if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
|
||
netif_dbg(dev, tx_err, dev->net, "no urb\n");
|
||
goto drop;
|
||
}
|
||
|
||
entry = (struct skb_data *) skb->cb;
|
||
entry->urb = urb;
|
||
entry->dev = dev;
|
||
|
||
usb_fill_bulk_urb (urb, dev->udev, dev->out,
|
||
skb->data, skb->len, tx_complete, skb);
|
||
if (dev->can_dma_sg) {
|
||
if (build_dma_sg(skb, urb) < 0)
|
||
goto drop;
|
||
}
|
||
length = urb->transfer_buffer_length;
|
||
|
||
/* 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.
|
||
* NOTE2: CDC NCM specification is different from CDC ECM when
|
||
* handling ZLP/short packets, so cdc_ncm driver will make short
|
||
* packet itself if needed.
|
||
*/
|
||
if (length % dev->maxpacket == 0) {
|
||
if (!(info->flags & FLAG_SEND_ZLP)) {
|
||
if (!(info->flags & FLAG_MULTI_PACKET)) {
|
||
length++;
|
||
if (skb_tailroom(skb) && !urb->num_sgs) {
|
||
skb->data[skb->len] = 0;
|
||
__skb_put(skb, 1);
|
||
} else if (urb->num_sgs)
|
||
sg_set_buf(&urb->sg[urb->num_sgs++],
|
||
dev->padding_pkt, 1);
|
||
}
|
||
} else
|
||
urb->transfer_flags |= URB_ZERO_PACKET;
|
||
}
|
||
entry->length = urb->transfer_buffer_length = length;
|
||
|
||
spin_lock_irqsave(&dev->txq.lock, flags);
|
||
retval = usb_autopm_get_interface_async(dev->intf);
|
||
if (retval < 0) {
|
||
spin_unlock_irqrestore(&dev->txq.lock, flags);
|
||
goto drop;
|
||
}
|
||
|
||
#ifdef CONFIG_PM
|
||
/* if this triggers the device is still a sleep */
|
||
if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
|
||
/* transmission will be done in resume */
|
||
usb_anchor_urb(urb, &dev->deferred);
|
||
/* no use to process more packets */
|
||
netif_stop_queue(net);
|
||
usb_put_urb(urb);
|
||
spin_unlock_irqrestore(&dev->txq.lock, flags);
|
||
netdev_dbg(dev->net, "Delaying transmission for resumption\n");
|
||
goto deferred;
|
||
}
|
||
#endif
|
||
|
||
switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
|
||
case -EPIPE:
|
||
netif_stop_queue (net);
|
||
usbnet_defer_kevent (dev, EVENT_TX_HALT);
|
||
usb_autopm_put_interface_async(dev->intf);
|
||
break;
|
||
default:
|
||
usb_autopm_put_interface_async(dev->intf);
|
||
netif_dbg(dev, tx_err, dev->net,
|
||
"tx: submit urb err %d\n", retval);
|
||
break;
|
||
case 0:
|
||
net->trans_start = jiffies;
|
||
__usbnet_queue_skb(&dev->txq, skb, tx_start);
|
||
if (dev->txq.qlen >= TX_QLEN (dev))
|
||
netif_stop_queue (net);
|
||
}
|
||
spin_unlock_irqrestore (&dev->txq.lock, flags);
|
||
|
||
if (retval) {
|
||
netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
|
||
drop:
|
||
dev->net->stats.tx_dropped++;
|
||
not_drop:
|
||
if (skb)
|
||
dev_kfree_skb_any (skb);
|
||
if (urb) {
|
||
kfree(urb->sg);
|
||
usb_free_urb(urb);
|
||
}
|
||
} else
|
||
netif_dbg(dev, tx_queued, dev->net,
|
||
"> tx, len %d, type 0x%x\n", length, skb->protocol);
|
||
#ifdef CONFIG_PM
|
||
deferred:
|
||
#endif
|
||
return NETDEV_TX_OK;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_start_xmit);
|
||
|
||
static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
|
||
{
|
||
struct urb *urb;
|
||
int i;
|
||
int ret = 0;
|
||
|
||
/* don't refill the queue all at once */
|
||
for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
|
||
urb = usb_alloc_urb(0, flags);
|
||
if (urb != NULL) {
|
||
ret = rx_submit(dev, urb, flags);
|
||
if (ret)
|
||
goto err;
|
||
} else {
|
||
ret = -ENOMEM;
|
||
goto err;
|
||
}
|
||
}
|
||
err:
|
||
return ret;
|
||
}
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
// 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:
|
||
kfree(entry->urb->sg);
|
||
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);
|
||
}
|
||
}
|
||
|
||
/* restart RX again after disabling due to high error rate */
|
||
clear_bit(EVENT_RX_KILL, &dev->flags);
|
||
|
||
// 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) &&
|
||
netif_carrier_ok(dev->net) &&
|
||
!timer_pending (&dev->delay) &&
|
||
!test_bit (EVENT_RX_HALT, &dev->flags)) {
|
||
int temp = dev->rxq.qlen;
|
||
|
||
if (temp < RX_QLEN(dev)) {
|
||
if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
|
||
return;
|
||
if (temp != dev->rxq.qlen)
|
||
netif_dbg(dev, link, dev->net,
|
||
"rxqlen %d --> %d\n",
|
||
temp, dev->rxq.qlen);
|
||
if (dev->rxq.qlen < RX_QLEN(dev))
|
||
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);
|
||
|
||
netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
|
||
intf->dev.driver->name,
|
||
xdev->bus->bus_name, xdev->devpath,
|
||
dev->driver_info->description);
|
||
|
||
net = dev->net;
|
||
unregister_netdev (net);
|
||
|
||
cancel_work_sync(&dev->kevent);
|
||
|
||
usb_scuttle_anchored_urbs(&dev->deferred);
|
||
|
||
if (dev->driver_info->unbind)
|
||
dev->driver_info->unbind (dev, intf);
|
||
|
||
usb_kill_urb(dev->interrupt);
|
||
usb_free_urb(dev->interrupt);
|
||
kfree(dev->padding_pkt);
|
||
|
||
free_netdev(net);
|
||
}
|
||
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
|
||
|
||
static struct device_type wlan_type = {
|
||
.name = "wlan",
|
||
};
|
||
|
||
static struct device_type wwan_type = {
|
||
.name = "wwan",
|
||
};
|
||
|
||
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;
|
||
struct usb_driver *driver = to_usb_driver(udev->dev.driver);
|
||
|
||
/* usbnet already took usb runtime pm, so have to enable the feature
|
||
* for usb interface, otherwise usb_autopm_get_interface may return
|
||
* failure if RUNTIME_PM is enabled.
|
||
*/
|
||
if (!driver->supports_autosuspend) {
|
||
driver->supports_autosuspend = 1;
|
||
pm_runtime_enable(&udev->dev);
|
||
}
|
||
|
||
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;
|
||
|
||
status = -ENOMEM;
|
||
|
||
// set up our own records
|
||
net = alloc_etherdev(sizeof(*dev));
|
||
if (!net)
|
||
goto out;
|
||
|
||
/* netdev_printk() needs this so do it as early as possible */
|
||
SET_NETDEV_DEV(net, &udev->dev);
|
||
|
||
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);
|
||
init_usb_anchor(&dev->deferred);
|
||
dev->delay.function = usbnet_bh;
|
||
dev->delay.data = (unsigned long) dev;
|
||
init_timer (&dev->delay);
|
||
mutex_init (&dev->phy_mutex);
|
||
mutex_init(&dev->interrupt_mutex);
|
||
dev->interrupt_count = 0;
|
||
|
||
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 &&
|
||
((dev->driver_info->flags & FLAG_POINTTOPOINT) == 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");
|
||
/* WWAN devices should always be named "wwan%d" */
|
||
if ((dev->driver_info->flags & FLAG_WWAN) != 0)
|
||
strcpy(net->name, "wwan%d");
|
||
|
||
/* devices that cannot do ARP */
|
||
if ((dev->driver_info->flags & FLAG_NOARP) != 0)
|
||
net->flags |= IFF_NOARP;
|
||
|
||
/* 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);
|
||
|
||
/* let userspace know we have a random address */
|
||
if (ether_addr_equal(net->dev_addr, node_id))
|
||
net->addr_assign_type = NET_ADDR_RANDOM;
|
||
|
||
if ((dev->driver_info->flags & FLAG_WLAN) != 0)
|
||
SET_NETDEV_DEVTYPE(net, &wlan_type);
|
||
if ((dev->driver_info->flags & FLAG_WWAN) != 0)
|
||
SET_NETDEV_DEVTYPE(net, &wwan_type);
|
||
|
||
/* initialize max rx_qlen and tx_qlen */
|
||
usbnet_update_max_qlen(dev);
|
||
|
||
if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
|
||
!(info->flags & FLAG_MULTI_PACKET)) {
|
||
dev->padding_pkt = kzalloc(1, GFP_KERNEL);
|
||
if (!dev->padding_pkt) {
|
||
status = -ENOMEM;
|
||
goto out4;
|
||
}
|
||
}
|
||
|
||
status = register_netdev (net);
|
||
if (status)
|
||
goto out5;
|
||
netif_info(dev, probe, dev->net,
|
||
"register '%s' at usb-%s-%s, %s, %pM\n",
|
||
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);
|
||
|
||
netif_device_attach (net);
|
||
|
||
if (dev->driver_info->flags & FLAG_LINK_INTR)
|
||
usbnet_link_change(dev, 0, 0);
|
||
|
||
return 0;
|
||
|
||
out5:
|
||
kfree(dev->padding_pkt);
|
||
out4:
|
||
usb_free_urb(dev->interrupt);
|
||
out3:
|
||
if (info->unbind)
|
||
info->unbind (dev, udev);
|
||
out1:
|
||
free_netdev(net);
|
||
out:
|
||
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++) {
|
||
spin_lock_irq(&dev->txq.lock);
|
||
/* don't autosuspend while transmitting */
|
||
if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
|
||
dev->suspend_count--;
|
||
spin_unlock_irq(&dev->txq.lock);
|
||
return -EBUSY;
|
||
} else {
|
||
set_bit(EVENT_DEV_ASLEEP, &dev->flags);
|
||
spin_unlock_irq(&dev->txq.lock);
|
||
}
|
||
/*
|
||
* accelerate emptying of the rx and queues, to avoid
|
||
* having everything error out.
|
||
*/
|
||
netif_device_detach (dev->net);
|
||
usbnet_terminate_urbs(dev);
|
||
__usbnet_status_stop_force(dev);
|
||
|
||
/*
|
||
* 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);
|
||
struct sk_buff *skb;
|
||
struct urb *res;
|
||
int retval;
|
||
|
||
if (!--dev->suspend_count) {
|
||
/* resume interrupt URB if it was previously submitted */
|
||
__usbnet_status_start_force(dev, GFP_NOIO);
|
||
|
||
spin_lock_irq(&dev->txq.lock);
|
||
while ((res = usb_get_from_anchor(&dev->deferred))) {
|
||
|
||
skb = (struct sk_buff *)res->context;
|
||
retval = usb_submit_urb(res, GFP_ATOMIC);
|
||
if (retval < 0) {
|
||
dev_kfree_skb_any(skb);
|
||
kfree(res->sg);
|
||
usb_free_urb(res);
|
||
usb_autopm_put_interface_async(dev->intf);
|
||
} else {
|
||
dev->net->trans_start = jiffies;
|
||
__skb_queue_tail(&dev->txq, skb);
|
||
}
|
||
}
|
||
|
||
smp_mb();
|
||
clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
|
||
spin_unlock_irq(&dev->txq.lock);
|
||
|
||
if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
|
||
/* handle remote wakeup ASAP */
|
||
if (!dev->wait &&
|
||
netif_device_present(dev->net) &&
|
||
!timer_pending(&dev->delay) &&
|
||
!test_bit(EVENT_RX_HALT, &dev->flags))
|
||
rx_alloc_submit(dev, GFP_NOIO);
|
||
|
||
if (!(dev->txq.qlen >= TX_QLEN(dev)))
|
||
netif_tx_wake_all_queues(dev->net);
|
||
tasklet_schedule (&dev->bh);
|
||
}
|
||
}
|
||
|
||
if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
|
||
usb_autopm_get_interface_no_resume(intf);
|
||
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_resume);
|
||
|
||
/*
|
||
* Either a subdriver implements manage_power, then it is assumed to always
|
||
* be ready to be suspended or it reports the readiness to be suspended
|
||
* explicitly
|
||
*/
|
||
void usbnet_device_suggests_idle(struct usbnet *dev)
|
||
{
|
||
if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
|
||
dev->intf->needs_remote_wakeup = 1;
|
||
usb_autopm_put_interface_async(dev->intf);
|
||
}
|
||
}
|
||
EXPORT_SYMBOL(usbnet_device_suggests_idle);
|
||
|
||
/*
|
||
* For devices that can do without special commands
|
||
*/
|
||
int usbnet_manage_power(struct usbnet *dev, int on)
|
||
{
|
||
dev->intf->needs_remote_wakeup = on;
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL(usbnet_manage_power);
|
||
|
||
void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
|
||
{
|
||
/* update link after link is reseted */
|
||
if (link && !need_reset)
|
||
netif_carrier_on(dev->net);
|
||
else
|
||
netif_carrier_off(dev->net);
|
||
|
||
if (need_reset && link)
|
||
usbnet_defer_kevent(dev, EVENT_LINK_RESET);
|
||
else
|
||
usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
|
||
}
|
||
EXPORT_SYMBOL(usbnet_link_change);
|
||
|
||
/*-------------------------------------------------------------------------*/
|
||
static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
|
||
u16 value, u16 index, void *data, u16 size)
|
||
{
|
||
void *buf = NULL;
|
||
int err = -ENOMEM;
|
||
|
||
netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
|
||
" value=0x%04x index=0x%04x size=%d\n",
|
||
cmd, reqtype, value, index, size);
|
||
|
||
if (data) {
|
||
buf = kmalloc(size, GFP_KERNEL);
|
||
if (!buf)
|
||
goto out;
|
||
}
|
||
|
||
err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
|
||
cmd, reqtype, value, index, buf, size,
|
||
USB_CTRL_GET_TIMEOUT);
|
||
if (err > 0 && err <= size)
|
||
memcpy(data, buf, err);
|
||
kfree(buf);
|
||
out:
|
||
return err;
|
||
}
|
||
|
||
static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
|
||
u16 value, u16 index, const void *data,
|
||
u16 size)
|
||
{
|
||
void *buf = NULL;
|
||
int err = -ENOMEM;
|
||
|
||
netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
|
||
" value=0x%04x index=0x%04x size=%d\n",
|
||
cmd, reqtype, value, index, size);
|
||
|
||
if (data) {
|
||
buf = kmemdup(data, size, GFP_KERNEL);
|
||
if (!buf)
|
||
goto out;
|
||
}
|
||
|
||
err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
|
||
cmd, reqtype, value, index, buf, size,
|
||
USB_CTRL_SET_TIMEOUT);
|
||
kfree(buf);
|
||
|
||
out:
|
||
return err;
|
||
}
|
||
|
||
/*
|
||
* The function can't be called inside suspend/resume callback,
|
||
* otherwise deadlock will be caused.
|
||
*/
|
||
int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
|
||
u16 value, u16 index, void *data, u16 size)
|
||
{
|
||
int ret;
|
||
|
||
if (usb_autopm_get_interface(dev->intf) < 0)
|
||
return -ENODEV;
|
||
ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
|
||
data, size);
|
||
usb_autopm_put_interface(dev->intf);
|
||
return ret;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_read_cmd);
|
||
|
||
/*
|
||
* The function can't be called inside suspend/resume callback,
|
||
* otherwise deadlock will be caused.
|
||
*/
|
||
int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
|
||
u16 value, u16 index, const void *data, u16 size)
|
||
{
|
||
int ret;
|
||
|
||
if (usb_autopm_get_interface(dev->intf) < 0)
|
||
return -ENODEV;
|
||
ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
|
||
data, size);
|
||
usb_autopm_put_interface(dev->intf);
|
||
return ret;
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_write_cmd);
|
||
|
||
/*
|
||
* The function can be called inside suspend/resume callback safely
|
||
* and should only be called by suspend/resume callback generally.
|
||
*/
|
||
int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
|
||
u16 value, u16 index, void *data, u16 size)
|
||
{
|
||
return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
|
||
data, size);
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
|
||
|
||
/*
|
||
* The function can be called inside suspend/resume callback safely
|
||
* and should only be called by suspend/resume callback generally.
|
||
*/
|
||
int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
|
||
u16 value, u16 index, const void *data,
|
||
u16 size)
|
||
{
|
||
return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
|
||
data, size);
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
|
||
|
||
static void usbnet_async_cmd_cb(struct urb *urb)
|
||
{
|
||
struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
|
||
int status = urb->status;
|
||
|
||
if (status < 0)
|
||
dev_dbg(&urb->dev->dev, "%s failed with %d",
|
||
__func__, status);
|
||
|
||
kfree(req);
|
||
usb_free_urb(urb);
|
||
}
|
||
|
||
/*
|
||
* The caller must make sure that device can't be put into suspend
|
||
* state until the control URB completes.
|
||
*/
|
||
int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
|
||
u16 value, u16 index, const void *data, u16 size)
|
||
{
|
||
struct usb_ctrlrequest *req = NULL;
|
||
struct urb *urb;
|
||
int err = -ENOMEM;
|
||
void *buf = NULL;
|
||
|
||
netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
|
||
" value=0x%04x index=0x%04x size=%d\n",
|
||
cmd, reqtype, value, index, size);
|
||
|
||
urb = usb_alloc_urb(0, GFP_ATOMIC);
|
||
if (!urb) {
|
||
netdev_err(dev->net, "Error allocating URB in"
|
||
" %s!\n", __func__);
|
||
goto fail;
|
||
}
|
||
|
||
if (data) {
|
||
buf = kmemdup(data, size, GFP_ATOMIC);
|
||
if (!buf) {
|
||
netdev_err(dev->net, "Error allocating buffer"
|
||
" in %s!\n", __func__);
|
||
goto fail_free;
|
||
}
|
||
}
|
||
|
||
req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
|
||
if (!req)
|
||
goto fail_free_buf;
|
||
|
||
req->bRequestType = reqtype;
|
||
req->bRequest = cmd;
|
||
req->wValue = cpu_to_le16(value);
|
||
req->wIndex = cpu_to_le16(index);
|
||
req->wLength = cpu_to_le16(size);
|
||
|
||
usb_fill_control_urb(urb, dev->udev,
|
||
usb_sndctrlpipe(dev->udev, 0),
|
||
(void *)req, buf, size,
|
||
usbnet_async_cmd_cb, req);
|
||
urb->transfer_flags |= URB_FREE_BUFFER;
|
||
|
||
err = usb_submit_urb(urb, GFP_ATOMIC);
|
||
if (err < 0) {
|
||
netdev_err(dev->net, "Error submitting the control"
|
||
" message: status=%d\n", err);
|
||
goto fail_free;
|
||
}
|
||
return 0;
|
||
|
||
fail_free_buf:
|
||
kfree(buf);
|
||
fail_free:
|
||
kfree(req);
|
||
usb_free_urb(urb);
|
||
fail:
|
||
return err;
|
||
|
||
}
|
||
EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
|
||
/*-------------------------------------------------------------------------*/
|
||
|
||
static int __init usbnet_init(void)
|
||
{
|
||
/* Compiler should optimize this out. */
|
||
BUILD_BUG_ON(
|
||
FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
|
||
|
||
eth_random_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");
|