2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
26 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
33 // #define DEBUG // error path messages, extra info
34 // #define VERBOSE // more; success messages
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/ctype.h>
41 #include <linux/ethtool.h>
42 #include <linux/workqueue.h>
43 #include <linux/mii.h>
44 #include <linux/usb.h>
45 #include <linux/usb/usbnet.h>
46 #include <linux/slab.h>
47 #include <linux/kernel.h>
48 #include <linux/pm_runtime.h>
50 #define DRIVER_VERSION "22-Aug-2005"
53 /*-------------------------------------------------------------------------*/
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
63 * let the USB host controller be busy for 5msec or more before an irq
64 * is required, under load. Jumbograms change the equation.
66 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
67 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
69 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
72 // reawaken network queue this soon after stopping; else watchdog barks
73 #define TX_TIMEOUT_JIFFIES (5*HZ)
75 // throttle rx/tx briefly after some faults, so khubd might disconnect()
76 // us (it polls at HZ/4 usually) before we report too many false errors.
77 #define THROTTLE_JIFFIES (HZ/8)
80 #define UNLINK_TIMEOUT_MS 3
82 /*-------------------------------------------------------------------------*/
84 // randomly generated ethernet address
85 static u8 node_id
[ETH_ALEN
];
87 static const char driver_name
[] = "usbnet";
89 /* use ethtool to change the level for any given device */
90 static int msg_level
= -1;
91 module_param (msg_level
, int, 0);
92 MODULE_PARM_DESC (msg_level
, "Override default message level");
94 /*-------------------------------------------------------------------------*/
96 /* handles CDC Ethernet and many other network "bulk data" interfaces */
97 int usbnet_get_endpoints(struct usbnet
*dev
, struct usb_interface
*intf
)
100 struct usb_host_interface
*alt
= NULL
;
101 struct usb_host_endpoint
*in
= NULL
, *out
= NULL
;
102 struct usb_host_endpoint
*status
= NULL
;
104 for (tmp
= 0; tmp
< intf
->num_altsetting
; tmp
++) {
107 in
= out
= status
= NULL
;
108 alt
= intf
->altsetting
+ tmp
;
110 /* take the first altsetting with in-bulk + out-bulk;
111 * remember any status endpoint, just in case;
112 * ignore other endpoints and altsetttings.
114 for (ep
= 0; ep
< alt
->desc
.bNumEndpoints
; ep
++) {
115 struct usb_host_endpoint
*e
;
118 e
= alt
->endpoint
+ ep
;
119 switch (e
->desc
.bmAttributes
) {
120 case USB_ENDPOINT_XFER_INT
:
121 if (!usb_endpoint_dir_in(&e
->desc
))
125 case USB_ENDPOINT_XFER_BULK
:
130 if (usb_endpoint_dir_in(&e
->desc
)) {
133 else if (intr
&& !status
)
143 if (!alt
|| !in
|| !out
)
146 if (alt
->desc
.bAlternateSetting
!= 0 ||
147 !(dev
->driver_info
->flags
& FLAG_NO_SETINT
)) {
148 tmp
= usb_set_interface (dev
->udev
, alt
->desc
.bInterfaceNumber
,
149 alt
->desc
.bAlternateSetting
);
154 dev
->in
= usb_rcvbulkpipe (dev
->udev
,
155 in
->desc
.bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
156 dev
->out
= usb_sndbulkpipe (dev
->udev
,
157 out
->desc
.bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
158 dev
->status
= status
;
161 EXPORT_SYMBOL_GPL(usbnet_get_endpoints
);
163 int usbnet_get_ethernet_addr(struct usbnet
*dev
, int iMACAddress
)
166 unsigned char buf
[13];
168 tmp
= usb_string(dev
->udev
, iMACAddress
, buf
, sizeof buf
);
170 dev_dbg(&dev
->udev
->dev
,
171 "bad MAC string %d fetch, %d\n", iMACAddress
, tmp
);
176 for (i
= tmp
= 0; i
< 6; i
++, tmp
+= 2)
177 dev
->net
->dev_addr
[i
] =
178 (hex_to_bin(buf
[tmp
]) << 4) + hex_to_bin(buf
[tmp
+ 1]);
181 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr
);
183 static void intr_complete (struct urb
*urb
);
185 static int init_status (struct usbnet
*dev
, struct usb_interface
*intf
)
192 if (!dev
->driver_info
->status
)
195 pipe
= usb_rcvintpipe (dev
->udev
,
196 dev
->status
->desc
.bEndpointAddress
197 & USB_ENDPOINT_NUMBER_MASK
);
198 maxp
= usb_maxpacket (dev
->udev
, pipe
, 0);
200 /* avoid 1 msec chatter: min 8 msec poll rate */
201 period
= max ((int) dev
->status
->desc
.bInterval
,
202 (dev
->udev
->speed
== USB_SPEED_HIGH
) ? 7 : 3);
204 buf
= kmalloc (maxp
, GFP_KERNEL
);
206 dev
->interrupt
= usb_alloc_urb (0, GFP_KERNEL
);
207 if (!dev
->interrupt
) {
211 usb_fill_int_urb(dev
->interrupt
, dev
->udev
, pipe
,
212 buf
, maxp
, intr_complete
, dev
, period
);
214 "status ep%din, %d bytes period %d\n",
215 usb_pipeendpoint(pipe
), maxp
, period
);
221 /* Passes this packet up the stack, updating its accounting.
222 * Some link protocols batch packets, so their rx_fixup paths
223 * can return clones as well as just modify the original skb.
225 void usbnet_skb_return (struct usbnet
*dev
, struct sk_buff
*skb
)
229 if (test_bit(EVENT_RX_PAUSED
, &dev
->flags
)) {
230 skb_queue_tail(&dev
->rxq_pause
, skb
);
234 skb
->protocol
= eth_type_trans (skb
, dev
->net
);
235 dev
->net
->stats
.rx_packets
++;
236 dev
->net
->stats
.rx_bytes
+= skb
->len
;
238 netif_dbg(dev
, rx_status
, dev
->net
, "< rx, len %zu, type 0x%x\n",
239 skb
->len
+ sizeof (struct ethhdr
), skb
->protocol
);
240 memset (skb
->cb
, 0, sizeof (struct skb_data
));
241 status
= netif_rx (skb
);
242 if (status
!= NET_RX_SUCCESS
)
243 netif_dbg(dev
, rx_err
, dev
->net
,
244 "netif_rx status %d\n", status
);
246 EXPORT_SYMBOL_GPL(usbnet_skb_return
);
249 /*-------------------------------------------------------------------------
251 * Network Device Driver (peer link to "Host Device", from USB host)
253 *-------------------------------------------------------------------------*/
255 int usbnet_change_mtu (struct net_device
*net
, int new_mtu
)
257 struct usbnet
*dev
= netdev_priv(net
);
258 int ll_mtu
= new_mtu
+ net
->hard_header_len
;
259 int old_hard_mtu
= dev
->hard_mtu
;
260 int old_rx_urb_size
= dev
->rx_urb_size
;
264 // no second zero-length packet read wanted after mtu-sized packets
265 if ((ll_mtu
% dev
->maxpacket
) == 0)
269 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
270 if (dev
->rx_urb_size
== old_hard_mtu
) {
271 dev
->rx_urb_size
= dev
->hard_mtu
;
272 if (dev
->rx_urb_size
> old_rx_urb_size
)
273 usbnet_unlink_rx_urbs(dev
);
278 EXPORT_SYMBOL_GPL(usbnet_change_mtu
);
280 /*-------------------------------------------------------------------------*/
282 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
283 * completion callbacks. 2.5 should have fixed those bugs...
286 static void defer_bh(struct usbnet
*dev
, struct sk_buff
*skb
, struct sk_buff_head
*list
)
290 spin_lock_irqsave(&list
->lock
, flags
);
291 __skb_unlink(skb
, list
);
292 spin_unlock(&list
->lock
);
293 spin_lock(&dev
->done
.lock
);
294 __skb_queue_tail(&dev
->done
, skb
);
295 if (dev
->done
.qlen
== 1)
296 tasklet_schedule(&dev
->bh
);
297 spin_unlock_irqrestore(&dev
->done
.lock
, flags
);
300 /* some work can't be done in tasklets, so we use keventd
302 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
303 * but tasklet_schedule() doesn't. hope the failure is rare.
305 void usbnet_defer_kevent (struct usbnet
*dev
, int work
)
307 set_bit (work
, &dev
->flags
);
308 if (!schedule_work (&dev
->kevent
))
309 netdev_err(dev
->net
, "kevent %d may have been dropped\n", work
);
311 netdev_dbg(dev
->net
, "kevent %d scheduled\n", work
);
313 EXPORT_SYMBOL_GPL(usbnet_defer_kevent
);
315 /*-------------------------------------------------------------------------*/
317 static void rx_complete (struct urb
*urb
);
319 static int rx_submit (struct usbnet
*dev
, struct urb
*urb
, gfp_t flags
)
322 struct skb_data
*entry
;
324 unsigned long lockflags
;
325 size_t size
= dev
->rx_urb_size
;
327 if ((skb
= alloc_skb (size
+ NET_IP_ALIGN
, flags
)) == NULL
) {
328 netif_dbg(dev
, rx_err
, dev
->net
, "no rx skb\n");
329 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
333 skb_reserve (skb
, NET_IP_ALIGN
);
335 entry
= (struct skb_data
*) skb
->cb
;
338 entry
->state
= rx_start
;
341 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->in
,
342 skb
->data
, size
, rx_complete
, skb
);
344 spin_lock_irqsave (&dev
->rxq
.lock
, lockflags
);
346 if (netif_running (dev
->net
) &&
347 netif_device_present (dev
->net
) &&
348 !test_bit (EVENT_RX_HALT
, &dev
->flags
) &&
349 !test_bit (EVENT_DEV_ASLEEP
, &dev
->flags
)) {
350 switch (retval
= usb_submit_urb (urb
, GFP_ATOMIC
)) {
352 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
355 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
358 netif_dbg(dev
, ifdown
, dev
->net
, "device gone\n");
359 netif_device_detach (dev
->net
);
365 netif_dbg(dev
, rx_err
, dev
->net
,
366 "rx submit, %d\n", retval
);
367 tasklet_schedule (&dev
->bh
);
370 __skb_queue_tail (&dev
->rxq
, skb
);
373 netif_dbg(dev
, ifdown
, dev
->net
, "rx: stopped\n");
376 spin_unlock_irqrestore (&dev
->rxq
.lock
, lockflags
);
378 dev_kfree_skb_any (skb
);
385 /*-------------------------------------------------------------------------*/
387 static inline void rx_process (struct usbnet
*dev
, struct sk_buff
*skb
)
389 if (dev
->driver_info
->rx_fixup
&&
390 !dev
->driver_info
->rx_fixup (dev
, skb
)) {
391 /* With RX_ASSEMBLE, rx_fixup() must update counters */
392 if (!(dev
->driver_info
->flags
& FLAG_RX_ASSEMBLE
))
393 dev
->net
->stats
.rx_errors
++;
396 // else network stack removes extra byte if we forced a short packet
399 /* all data was already cloned from skb inside the driver */
400 if (dev
->driver_info
->flags
& FLAG_MULTI_PACKET
)
401 dev_kfree_skb_any(skb
);
403 usbnet_skb_return(dev
, skb
);
407 netif_dbg(dev
, rx_err
, dev
->net
, "drop\n");
408 dev
->net
->stats
.rx_errors
++;
410 skb_queue_tail(&dev
->done
, skb
);
413 /*-------------------------------------------------------------------------*/
415 static void rx_complete (struct urb
*urb
)
417 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
418 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
419 struct usbnet
*dev
= entry
->dev
;
420 int urb_status
= urb
->status
;
422 skb_put (skb
, urb
->actual_length
);
423 entry
->state
= rx_done
;
426 switch (urb_status
) {
429 if (skb
->len
< dev
->net
->hard_header_len
) {
430 entry
->state
= rx_cleanup
;
431 dev
->net
->stats
.rx_errors
++;
432 dev
->net
->stats
.rx_length_errors
++;
433 netif_dbg(dev
, rx_err
, dev
->net
,
434 "rx length %d\n", skb
->len
);
438 /* stalls need manual reset. this is rare ... except that
439 * when going through USB 2.0 TTs, unplug appears this way.
440 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
441 * storm, recovering as needed.
444 dev
->net
->stats
.rx_errors
++;
445 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
448 /* software-driven interface shutdown */
449 case -ECONNRESET
: /* async unlink */
450 case -ESHUTDOWN
: /* hardware gone */
451 netif_dbg(dev
, ifdown
, dev
->net
,
452 "rx shutdown, code %d\n", urb_status
);
455 /* we get controller i/o faults during khubd disconnect() delays.
456 * throttle down resubmits, to avoid log floods; just temporarily,
457 * so we still recover when the fault isn't a khubd delay.
462 dev
->net
->stats
.rx_errors
++;
463 if (!timer_pending (&dev
->delay
)) {
464 mod_timer (&dev
->delay
, jiffies
+ THROTTLE_JIFFIES
);
465 netif_dbg(dev
, link
, dev
->net
,
466 "rx throttle %d\n", urb_status
);
469 entry
->state
= rx_cleanup
;
474 /* data overrun ... flush fifo? */
476 dev
->net
->stats
.rx_over_errors
++;
480 entry
->state
= rx_cleanup
;
481 dev
->net
->stats
.rx_errors
++;
482 netif_dbg(dev
, rx_err
, dev
->net
, "rx status %d\n", urb_status
);
486 defer_bh(dev
, skb
, &dev
->rxq
);
489 if (netif_running (dev
->net
) &&
490 !test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
491 rx_submit (dev
, urb
, GFP_ATOMIC
);
496 netif_dbg(dev
, rx_err
, dev
->net
, "no read resubmitted\n");
499 static void intr_complete (struct urb
*urb
)
501 struct usbnet
*dev
= urb
->context
;
502 int status
= urb
->status
;
507 dev
->driver_info
->status(dev
, urb
);
510 /* software-driven interface shutdown */
511 case -ENOENT
: /* urb killed */
512 case -ESHUTDOWN
: /* hardware gone */
513 netif_dbg(dev
, ifdown
, dev
->net
,
514 "intr shutdown, code %d\n", status
);
517 /* NOTE: not throttling like RX/TX, since this endpoint
518 * already polls infrequently
521 netdev_dbg(dev
->net
, "intr status %d\n", status
);
525 if (!netif_running (dev
->net
))
528 memset(urb
->transfer_buffer
, 0, urb
->transfer_buffer_length
);
529 status
= usb_submit_urb (urb
, GFP_ATOMIC
);
531 netif_err(dev
, timer
, dev
->net
,
532 "intr resubmit --> %d\n", status
);
535 /*-------------------------------------------------------------------------*/
536 void usbnet_pause_rx(struct usbnet
*dev
)
538 set_bit(EVENT_RX_PAUSED
, &dev
->flags
);
540 netif_dbg(dev
, rx_status
, dev
->net
, "paused rx queue enabled\n");
542 EXPORT_SYMBOL_GPL(usbnet_pause_rx
);
544 void usbnet_resume_rx(struct usbnet
*dev
)
549 clear_bit(EVENT_RX_PAUSED
, &dev
->flags
);
551 while ((skb
= skb_dequeue(&dev
->rxq_pause
)) != NULL
) {
552 usbnet_skb_return(dev
, skb
);
556 tasklet_schedule(&dev
->bh
);
558 netif_dbg(dev
, rx_status
, dev
->net
,
559 "paused rx queue disabled, %d skbs requeued\n", num
);
561 EXPORT_SYMBOL_GPL(usbnet_resume_rx
);
563 void usbnet_purge_paused_rxq(struct usbnet
*dev
)
565 skb_queue_purge(&dev
->rxq_pause
);
567 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq
);
569 /*-------------------------------------------------------------------------*/
571 // unlink pending rx/tx; completion handlers do all other cleanup
573 static int unlink_urbs (struct usbnet
*dev
, struct sk_buff_head
*q
)
576 struct sk_buff
*skb
, *skbnext
;
579 spin_lock_irqsave (&q
->lock
, flags
);
580 skb_queue_walk_safe(q
, skb
, skbnext
) {
581 struct skb_data
*entry
;
585 entry
= (struct skb_data
*) skb
->cb
;
588 // during some PM-driven resume scenarios,
589 // these (async) unlinks complete immediately
590 retval
= usb_unlink_urb (urb
);
591 if (retval
!= -EINPROGRESS
&& retval
!= 0)
592 netdev_dbg(dev
->net
, "unlink urb err, %d\n", retval
);
596 spin_unlock_irqrestore (&q
->lock
, flags
);
600 // Flush all pending rx urbs
601 // minidrivers may need to do this when the MTU changes
603 void usbnet_unlink_rx_urbs(struct usbnet
*dev
)
605 if (netif_running(dev
->net
)) {
606 (void) unlink_urbs (dev
, &dev
->rxq
);
607 tasklet_schedule(&dev
->bh
);
610 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs
);
612 /*-------------------------------------------------------------------------*/
614 // precondition: never called in_interrupt
615 static void usbnet_terminate_urbs(struct usbnet
*dev
)
617 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup
);
618 DECLARE_WAITQUEUE(wait
, current
);
621 /* ensure there are no more active urbs */
622 add_wait_queue(&unlink_wakeup
, &wait
);
623 set_current_state(TASK_UNINTERRUPTIBLE
);
624 dev
->wait
= &unlink_wakeup
;
625 temp
= unlink_urbs(dev
, &dev
->txq
) +
626 unlink_urbs(dev
, &dev
->rxq
);
628 /* maybe wait for deletions to finish. */
629 while (!skb_queue_empty(&dev
->rxq
)
630 && !skb_queue_empty(&dev
->txq
)
631 && !skb_queue_empty(&dev
->done
)) {
632 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS
));
633 set_current_state(TASK_UNINTERRUPTIBLE
);
634 netif_dbg(dev
, ifdown
, dev
->net
,
635 "waited for %d urb completions\n", temp
);
637 set_current_state(TASK_RUNNING
);
639 remove_wait_queue(&unlink_wakeup
, &wait
);
642 int usbnet_stop (struct net_device
*net
)
644 struct usbnet
*dev
= netdev_priv(net
);
645 struct driver_info
*info
= dev
->driver_info
;
648 netif_stop_queue (net
);
650 netif_info(dev
, ifdown
, dev
->net
,
651 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
652 net
->stats
.rx_packets
, net
->stats
.tx_packets
,
653 net
->stats
.rx_errors
, net
->stats
.tx_errors
);
655 /* allow minidriver to stop correctly (wireless devices to turn off
658 retval
= info
->stop(dev
);
660 netif_info(dev
, ifdown
, dev
->net
,
661 "stop fail (%d) usbnet usb-%s-%s, %s\n",
663 dev
->udev
->bus
->bus_name
, dev
->udev
->devpath
,
667 if (!(info
->flags
& FLAG_AVOID_UNLINK_URBS
))
668 usbnet_terminate_urbs(dev
);
670 usb_kill_urb(dev
->interrupt
);
672 usbnet_purge_paused_rxq(dev
);
674 /* deferred work (task, timer, softirq) must also stop.
675 * can't flush_scheduled_work() until we drop rtnl (later),
676 * else workers could deadlock; so make workers a NOP.
679 del_timer_sync (&dev
->delay
);
680 tasklet_kill (&dev
->bh
);
681 if (info
->manage_power
)
682 info
->manage_power(dev
, 0);
684 usb_autopm_put_interface(dev
->intf
);
688 EXPORT_SYMBOL_GPL(usbnet_stop
);
690 /*-------------------------------------------------------------------------*/
692 // posts reads, and enables write queuing
694 // precondition: never called in_interrupt
696 int usbnet_open (struct net_device
*net
)
698 struct usbnet
*dev
= netdev_priv(net
);
700 struct driver_info
*info
= dev
->driver_info
;
702 if ((retval
= usb_autopm_get_interface(dev
->intf
)) < 0) {
703 netif_info(dev
, ifup
, dev
->net
,
704 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
706 dev
->udev
->bus
->bus_name
,
712 // put into "known safe" state
713 if (info
->reset
&& (retval
= info
->reset (dev
)) < 0) {
714 netif_info(dev
, ifup
, dev
->net
,
715 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
717 dev
->udev
->bus
->bus_name
,
723 // insist peer be connected
724 if (info
->check_connect
&& (retval
= info
->check_connect (dev
)) < 0) {
725 netif_dbg(dev
, ifup
, dev
->net
, "can't open; %d\n", retval
);
729 /* start any status interrupt transfer */
730 if (dev
->interrupt
) {
731 retval
= usb_submit_urb (dev
->interrupt
, GFP_KERNEL
);
733 netif_err(dev
, ifup
, dev
->net
,
734 "intr submit %d\n", retval
);
739 netif_start_queue (net
);
740 netif_info(dev
, ifup
, dev
->net
,
741 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
742 (int)RX_QLEN(dev
), (int)TX_QLEN(dev
),
744 (dev
->driver_info
->flags
& FLAG_FRAMING_NC
) ? "NetChip" :
745 (dev
->driver_info
->flags
& FLAG_FRAMING_GL
) ? "GeneSys" :
746 (dev
->driver_info
->flags
& FLAG_FRAMING_Z
) ? "Zaurus" :
747 (dev
->driver_info
->flags
& FLAG_FRAMING_RN
) ? "RNDIS" :
748 (dev
->driver_info
->flags
& FLAG_FRAMING_AX
) ? "ASIX" :
751 // delay posting reads until we're fully open
752 tasklet_schedule (&dev
->bh
);
753 if (info
->manage_power
) {
754 retval
= info
->manage_power(dev
, 1);
757 usb_autopm_put_interface(dev
->intf
);
762 usb_autopm_put_interface(dev
->intf
);
766 EXPORT_SYMBOL_GPL(usbnet_open
);
768 /*-------------------------------------------------------------------------*/
770 /* ethtool methods; minidrivers may need to add some more, but
771 * they'll probably want to use this base set.
774 int usbnet_get_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
776 struct usbnet
*dev
= netdev_priv(net
);
778 if (!dev
->mii
.mdio_read
)
781 return mii_ethtool_gset(&dev
->mii
, cmd
);
783 EXPORT_SYMBOL_GPL(usbnet_get_settings
);
785 int usbnet_set_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
787 struct usbnet
*dev
= netdev_priv(net
);
790 if (!dev
->mii
.mdio_write
)
793 retval
= mii_ethtool_sset(&dev
->mii
, cmd
);
795 /* link speed/duplex might have changed */
796 if (dev
->driver_info
->link_reset
)
797 dev
->driver_info
->link_reset(dev
);
802 EXPORT_SYMBOL_GPL(usbnet_set_settings
);
804 u32
usbnet_get_link (struct net_device
*net
)
806 struct usbnet
*dev
= netdev_priv(net
);
808 /* If a check_connect is defined, return its result */
809 if (dev
->driver_info
->check_connect
)
810 return dev
->driver_info
->check_connect (dev
) == 0;
812 /* if the device has mii operations, use those */
813 if (dev
->mii
.mdio_read
)
814 return mii_link_ok(&dev
->mii
);
816 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
817 return ethtool_op_get_link(net
);
819 EXPORT_SYMBOL_GPL(usbnet_get_link
);
821 int usbnet_nway_reset(struct net_device
*net
)
823 struct usbnet
*dev
= netdev_priv(net
);
825 if (!dev
->mii
.mdio_write
)
828 return mii_nway_restart(&dev
->mii
);
830 EXPORT_SYMBOL_GPL(usbnet_nway_reset
);
832 void usbnet_get_drvinfo (struct net_device
*net
, struct ethtool_drvinfo
*info
)
834 struct usbnet
*dev
= netdev_priv(net
);
836 strncpy (info
->driver
, dev
->driver_name
, sizeof info
->driver
);
837 strncpy (info
->version
, DRIVER_VERSION
, sizeof info
->version
);
838 strncpy (info
->fw_version
, dev
->driver_info
->description
,
839 sizeof info
->fw_version
);
840 usb_make_path (dev
->udev
, info
->bus_info
, sizeof info
->bus_info
);
842 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo
);
844 u32
usbnet_get_msglevel (struct net_device
*net
)
846 struct usbnet
*dev
= netdev_priv(net
);
848 return dev
->msg_enable
;
850 EXPORT_SYMBOL_GPL(usbnet_get_msglevel
);
852 void usbnet_set_msglevel (struct net_device
*net
, u32 level
)
854 struct usbnet
*dev
= netdev_priv(net
);
856 dev
->msg_enable
= level
;
858 EXPORT_SYMBOL_GPL(usbnet_set_msglevel
);
860 /* drivers may override default ethtool_ops in their bind() routine */
861 static const struct ethtool_ops usbnet_ethtool_ops
= {
862 .get_settings
= usbnet_get_settings
,
863 .set_settings
= usbnet_set_settings
,
864 .get_link
= usbnet_get_link
,
865 .nway_reset
= usbnet_nway_reset
,
866 .get_drvinfo
= usbnet_get_drvinfo
,
867 .get_msglevel
= usbnet_get_msglevel
,
868 .set_msglevel
= usbnet_set_msglevel
,
871 /*-------------------------------------------------------------------------*/
873 /* work that cannot be done in interrupt context uses keventd.
875 * NOTE: with 2.5 we could do more of this using completion callbacks,
876 * especially now that control transfers can be queued.
879 kevent (struct work_struct
*work
)
882 container_of(work
, struct usbnet
, kevent
);
885 /* usb_clear_halt() needs a thread context */
886 if (test_bit (EVENT_TX_HALT
, &dev
->flags
)) {
887 unlink_urbs (dev
, &dev
->txq
);
888 status
= usb_autopm_get_interface(dev
->intf
);
891 status
= usb_clear_halt (dev
->udev
, dev
->out
);
892 usb_autopm_put_interface(dev
->intf
);
895 status
!= -ESHUTDOWN
) {
896 if (netif_msg_tx_err (dev
))
898 netdev_err(dev
->net
, "can't clear tx halt, status %d\n",
901 clear_bit (EVENT_TX_HALT
, &dev
->flags
);
902 if (status
!= -ESHUTDOWN
)
903 netif_wake_queue (dev
->net
);
906 if (test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
907 unlink_urbs (dev
, &dev
->rxq
);
908 status
= usb_autopm_get_interface(dev
->intf
);
911 status
= usb_clear_halt (dev
->udev
, dev
->in
);
912 usb_autopm_put_interface(dev
->intf
);
915 status
!= -ESHUTDOWN
) {
916 if (netif_msg_rx_err (dev
))
918 netdev_err(dev
->net
, "can't clear rx halt, status %d\n",
921 clear_bit (EVENT_RX_HALT
, &dev
->flags
);
922 tasklet_schedule (&dev
->bh
);
926 /* tasklet could resubmit itself forever if memory is tight */
927 if (test_bit (EVENT_RX_MEMORY
, &dev
->flags
)) {
928 struct urb
*urb
= NULL
;
931 if (netif_running (dev
->net
))
932 urb
= usb_alloc_urb (0, GFP_KERNEL
);
934 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
936 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
937 status
= usb_autopm_get_interface(dev
->intf
);
942 if (rx_submit (dev
, urb
, GFP_KERNEL
) == -ENOLINK
)
944 usb_autopm_put_interface(dev
->intf
);
947 tasklet_schedule (&dev
->bh
);
951 if (test_bit (EVENT_LINK_RESET
, &dev
->flags
)) {
952 struct driver_info
*info
= dev
->driver_info
;
955 clear_bit (EVENT_LINK_RESET
, &dev
->flags
);
956 status
= usb_autopm_get_interface(dev
->intf
);
959 if(info
->link_reset
&& (retval
= info
->link_reset(dev
)) < 0) {
960 usb_autopm_put_interface(dev
->intf
);
962 netdev_info(dev
->net
, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
964 dev
->udev
->bus
->bus_name
,
968 usb_autopm_put_interface(dev
->intf
);
973 netdev_dbg(dev
->net
, "kevent done, flags = 0x%lx\n", dev
->flags
);
976 /*-------------------------------------------------------------------------*/
978 static void tx_complete (struct urb
*urb
)
980 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
981 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
982 struct usbnet
*dev
= entry
->dev
;
984 if (urb
->status
== 0) {
985 if (!(dev
->driver_info
->flags
& FLAG_MULTI_PACKET
))
986 dev
->net
->stats
.tx_packets
++;
987 dev
->net
->stats
.tx_bytes
+= entry
->length
;
989 dev
->net
->stats
.tx_errors
++;
991 switch (urb
->status
) {
993 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
996 /* software-driven interface shutdown */
997 case -ECONNRESET
: // async unlink
998 case -ESHUTDOWN
: // hardware gone
1001 // like rx, tx gets controller i/o faults during khubd delays
1002 // and so it uses the same throttling mechanism.
1006 usb_mark_last_busy(dev
->udev
);
1007 if (!timer_pending (&dev
->delay
)) {
1008 mod_timer (&dev
->delay
,
1009 jiffies
+ THROTTLE_JIFFIES
);
1010 netif_dbg(dev
, link
, dev
->net
,
1011 "tx throttle %d\n", urb
->status
);
1013 netif_stop_queue (dev
->net
);
1016 netif_dbg(dev
, tx_err
, dev
->net
,
1017 "tx err %d\n", entry
->urb
->status
);
1022 usb_autopm_put_interface_async(dev
->intf
);
1024 entry
->state
= tx_done
;
1025 defer_bh(dev
, skb
, &dev
->txq
);
1028 /*-------------------------------------------------------------------------*/
1030 void usbnet_tx_timeout (struct net_device
*net
)
1032 struct usbnet
*dev
= netdev_priv(net
);
1034 unlink_urbs (dev
, &dev
->txq
);
1035 tasklet_schedule (&dev
->bh
);
1037 // FIXME: device recovery -- reset?
1039 EXPORT_SYMBOL_GPL(usbnet_tx_timeout
);
1041 /*-------------------------------------------------------------------------*/
1043 netdev_tx_t
usbnet_start_xmit (struct sk_buff
*skb
,
1044 struct net_device
*net
)
1046 struct usbnet
*dev
= netdev_priv(net
);
1048 struct urb
*urb
= NULL
;
1049 struct skb_data
*entry
;
1050 struct driver_info
*info
= dev
->driver_info
;
1051 unsigned long flags
;
1054 // some devices want funky USB-level framing, for
1055 // win32 driver (usually) and/or hardware quirks
1056 if (info
->tx_fixup
) {
1057 skb
= info
->tx_fixup (dev
, skb
, GFP_ATOMIC
);
1059 if (netif_msg_tx_err(dev
)) {
1060 netif_dbg(dev
, tx_err
, dev
->net
, "can't tx_fixup skb\n");
1063 /* cdc_ncm collected packet; waits for more */
1070 if (!(urb
= usb_alloc_urb (0, GFP_ATOMIC
))) {
1071 netif_dbg(dev
, tx_err
, dev
->net
, "no urb\n");
1075 entry
= (struct skb_data
*) skb
->cb
;
1078 entry
->state
= tx_start
;
1079 entry
->length
= length
;
1081 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->out
,
1082 skb
->data
, skb
->len
, tx_complete
, skb
);
1084 /* don't assume the hardware handles USB_ZERO_PACKET
1085 * NOTE: strictly conforming cdc-ether devices should expect
1086 * the ZLP here, but ignore the one-byte packet.
1087 * NOTE2: CDC NCM specification is different from CDC ECM when
1088 * handling ZLP/short packets, so cdc_ncm driver will make short
1089 * packet itself if needed.
1091 if (length
% dev
->maxpacket
== 0) {
1092 if (!(info
->flags
& FLAG_SEND_ZLP
)) {
1093 if (!(info
->flags
& FLAG_MULTI_PACKET
)) {
1094 urb
->transfer_buffer_length
++;
1095 if (skb_tailroom(skb
)) {
1096 skb
->data
[skb
->len
] = 0;
1101 urb
->transfer_flags
|= URB_ZERO_PACKET
;
1104 spin_lock_irqsave(&dev
->txq
.lock
, flags
);
1105 retval
= usb_autopm_get_interface_async(dev
->intf
);
1107 spin_unlock_irqrestore(&dev
->txq
.lock
, flags
);
1112 /* if this triggers the device is still a sleep */
1113 if (test_bit(EVENT_DEV_ASLEEP
, &dev
->flags
)) {
1114 /* transmission will be done in resume */
1115 usb_anchor_urb(urb
, &dev
->deferred
);
1116 /* no use to process more packets */
1117 netif_stop_queue(net
);
1118 spin_unlock_irqrestore(&dev
->txq
.lock
, flags
);
1119 netdev_dbg(dev
->net
, "Delaying transmission for resumption\n");
1124 switch ((retval
= usb_submit_urb (urb
, GFP_ATOMIC
))) {
1126 netif_stop_queue (net
);
1127 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
1128 usb_autopm_put_interface_async(dev
->intf
);
1131 usb_autopm_put_interface_async(dev
->intf
);
1132 netif_dbg(dev
, tx_err
, dev
->net
,
1133 "tx: submit urb err %d\n", retval
);
1136 net
->trans_start
= jiffies
;
1137 __skb_queue_tail (&dev
->txq
, skb
);
1138 if (dev
->txq
.qlen
>= TX_QLEN (dev
))
1139 netif_stop_queue (net
);
1141 spin_unlock_irqrestore (&dev
->txq
.lock
, flags
);
1144 netif_dbg(dev
, tx_err
, dev
->net
, "drop, code %d\n", retval
);
1146 dev
->net
->stats
.tx_dropped
++;
1149 dev_kfree_skb_any (skb
);
1152 netif_dbg(dev
, tx_queued
, dev
->net
,
1153 "> tx, len %d, type 0x%x\n", length
, skb
->protocol
);
1157 return NETDEV_TX_OK
;
1159 EXPORT_SYMBOL_GPL(usbnet_start_xmit
);
1161 /*-------------------------------------------------------------------------*/
1163 // tasklet (work deferred from completions, in_irq) or timer
1165 static void usbnet_bh (unsigned long param
)
1167 struct usbnet
*dev
= (struct usbnet
*) param
;
1168 struct sk_buff
*skb
;
1169 struct skb_data
*entry
;
1171 while ((skb
= skb_dequeue (&dev
->done
))) {
1172 entry
= (struct skb_data
*) skb
->cb
;
1173 switch (entry
->state
) {
1175 entry
->state
= rx_cleanup
;
1176 rx_process (dev
, skb
);
1180 usb_free_urb (entry
->urb
);
1181 dev_kfree_skb (skb
);
1184 netdev_dbg(dev
->net
, "bogus skb state %d\n", entry
->state
);
1188 // waiting for all pending urbs to complete?
1190 if ((dev
->txq
.qlen
+ dev
->rxq
.qlen
+ dev
->done
.qlen
) == 0) {
1191 wake_up (dev
->wait
);
1194 // or are we maybe short a few urbs?
1195 } else if (netif_running (dev
->net
) &&
1196 netif_device_present (dev
->net
) &&
1197 !timer_pending (&dev
->delay
) &&
1198 !test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
1199 int temp
= dev
->rxq
.qlen
;
1200 int qlen
= RX_QLEN (dev
);
1206 // don't refill the queue all at once
1207 for (i
= 0; i
< 10 && dev
->rxq
.qlen
< qlen
; i
++) {
1208 urb
= usb_alloc_urb (0, GFP_ATOMIC
);
1210 if (rx_submit (dev
, urb
, GFP_ATOMIC
) ==
1215 if (temp
!= dev
->rxq
.qlen
)
1216 netif_dbg(dev
, link
, dev
->net
,
1217 "rxqlen %d --> %d\n",
1218 temp
, dev
->rxq
.qlen
);
1219 if (dev
->rxq
.qlen
< qlen
)
1220 tasklet_schedule (&dev
->bh
);
1222 if (dev
->txq
.qlen
< TX_QLEN (dev
))
1223 netif_wake_queue (dev
->net
);
1228 /*-------------------------------------------------------------------------
1230 * USB Device Driver support
1232 *-------------------------------------------------------------------------*/
1234 // precondition: never called in_interrupt
1236 void usbnet_disconnect (struct usb_interface
*intf
)
1239 struct usb_device
*xdev
;
1240 struct net_device
*net
;
1242 dev
= usb_get_intfdata(intf
);
1243 usb_set_intfdata(intf
, NULL
);
1247 xdev
= interface_to_usbdev (intf
);
1249 netif_info(dev
, probe
, dev
->net
, "unregister '%s' usb-%s-%s, %s\n",
1250 intf
->dev
.driver
->name
,
1251 xdev
->bus
->bus_name
, xdev
->devpath
,
1252 dev
->driver_info
->description
);
1255 unregister_netdev (net
);
1257 cancel_work_sync(&dev
->kevent
);
1259 if (dev
->driver_info
->unbind
)
1260 dev
->driver_info
->unbind (dev
, intf
);
1265 EXPORT_SYMBOL_GPL(usbnet_disconnect
);
1267 static const struct net_device_ops usbnet_netdev_ops
= {
1268 .ndo_open
= usbnet_open
,
1269 .ndo_stop
= usbnet_stop
,
1270 .ndo_start_xmit
= usbnet_start_xmit
,
1271 .ndo_tx_timeout
= usbnet_tx_timeout
,
1272 .ndo_change_mtu
= usbnet_change_mtu
,
1273 .ndo_set_mac_address
= eth_mac_addr
,
1274 .ndo_validate_addr
= eth_validate_addr
,
1277 /*-------------------------------------------------------------------------*/
1279 // precondition: never called in_interrupt
1281 static struct device_type wlan_type
= {
1285 static struct device_type wwan_type
= {
1290 usbnet_probe (struct usb_interface
*udev
, const struct usb_device_id
*prod
)
1293 struct net_device
*net
;
1294 struct usb_host_interface
*interface
;
1295 struct driver_info
*info
;
1296 struct usb_device
*xdev
;
1299 struct usb_driver
*driver
= to_usb_driver(udev
->dev
.driver
);
1301 /* usbnet already took usb runtime pm, so have to enable the feature
1302 * for usb interface, otherwise usb_autopm_get_interface may return
1303 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1305 if (!driver
->supports_autosuspend
) {
1306 driver
->supports_autosuspend
= 1;
1307 pm_runtime_enable(&udev
->dev
);
1310 name
= udev
->dev
.driver
->name
;
1311 info
= (struct driver_info
*) prod
->driver_info
;
1313 dev_dbg (&udev
->dev
, "blacklisted by %s\n", name
);
1316 xdev
= interface_to_usbdev (udev
);
1317 interface
= udev
->cur_altsetting
;
1323 // set up our own records
1324 net
= alloc_etherdev(sizeof(*dev
));
1326 dbg ("can't kmalloc dev");
1330 /* netdev_printk() needs this so do it as early as possible */
1331 SET_NETDEV_DEV(net
, &udev
->dev
);
1333 dev
= netdev_priv(net
);
1336 dev
->driver_info
= info
;
1337 dev
->driver_name
= name
;
1338 dev
->msg_enable
= netif_msg_init (msg_level
, NETIF_MSG_DRV
1339 | NETIF_MSG_PROBE
| NETIF_MSG_LINK
);
1340 skb_queue_head_init (&dev
->rxq
);
1341 skb_queue_head_init (&dev
->txq
);
1342 skb_queue_head_init (&dev
->done
);
1343 skb_queue_head_init(&dev
->rxq_pause
);
1344 dev
->bh
.func
= usbnet_bh
;
1345 dev
->bh
.data
= (unsigned long) dev
;
1346 INIT_WORK (&dev
->kevent
, kevent
);
1347 init_usb_anchor(&dev
->deferred
);
1348 dev
->delay
.function
= usbnet_bh
;
1349 dev
->delay
.data
= (unsigned long) dev
;
1350 init_timer (&dev
->delay
);
1351 mutex_init (&dev
->phy_mutex
);
1354 strcpy (net
->name
, "usb%d");
1355 memcpy (net
->dev_addr
, node_id
, sizeof node_id
);
1357 /* rx and tx sides can use different message sizes;
1358 * bind() should set rx_urb_size in that case.
1360 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
1362 // dma_supported() is deeply broken on almost all architectures
1363 // possible with some EHCI controllers
1364 if (dma_supported (&udev
->dev
, DMA_BIT_MASK(64)))
1365 net
->features
|= NETIF_F_HIGHDMA
;
1368 net
->netdev_ops
= &usbnet_netdev_ops
;
1369 net
->watchdog_timeo
= TX_TIMEOUT_JIFFIES
;
1370 net
->ethtool_ops
= &usbnet_ethtool_ops
;
1372 // allow device-specific bind/init procedures
1373 // NOTE net->name still not usable ...
1375 status
= info
->bind (dev
, udev
);
1379 // heuristic: "usb%d" for links we know are two-host,
1380 // else "eth%d" when there's reasonable doubt. userspace
1381 // can rename the link if it knows better.
1382 if ((dev
->driver_info
->flags
& FLAG_ETHER
) != 0 &&
1383 ((dev
->driver_info
->flags
& FLAG_POINTTOPOINT
) == 0 ||
1384 (net
->dev_addr
[0] & 0x02) == 0))
1385 strcpy (net
->name
, "eth%d");
1386 /* WLAN devices should always be named "wlan%d" */
1387 if ((dev
->driver_info
->flags
& FLAG_WLAN
) != 0)
1388 strcpy(net
->name
, "wlan%d");
1389 /* WWAN devices should always be named "wwan%d" */
1390 if ((dev
->driver_info
->flags
& FLAG_WWAN
) != 0)
1391 strcpy(net
->name
, "wwan%d");
1393 /* maybe the remote can't receive an Ethernet MTU */
1394 if (net
->mtu
> (dev
->hard_mtu
- net
->hard_header_len
))
1395 net
->mtu
= dev
->hard_mtu
- net
->hard_header_len
;
1396 } else if (!info
->in
|| !info
->out
)
1397 status
= usbnet_get_endpoints (dev
, udev
);
1399 dev
->in
= usb_rcvbulkpipe (xdev
, info
->in
);
1400 dev
->out
= usb_sndbulkpipe (xdev
, info
->out
);
1401 if (!(info
->flags
& FLAG_NO_SETINT
))
1402 status
= usb_set_interface (xdev
,
1403 interface
->desc
.bInterfaceNumber
,
1404 interface
->desc
.bAlternateSetting
);
1409 if (status
>= 0 && dev
->status
)
1410 status
= init_status (dev
, udev
);
1414 if (!dev
->rx_urb_size
)
1415 dev
->rx_urb_size
= dev
->hard_mtu
;
1416 dev
->maxpacket
= usb_maxpacket (dev
->udev
, dev
->out
, 1);
1418 if ((dev
->driver_info
->flags
& FLAG_WLAN
) != 0)
1419 SET_NETDEV_DEVTYPE(net
, &wlan_type
);
1420 if ((dev
->driver_info
->flags
& FLAG_WWAN
) != 0)
1421 SET_NETDEV_DEVTYPE(net
, &wwan_type
);
1423 status
= register_netdev (net
);
1426 netif_info(dev
, probe
, dev
->net
,
1427 "register '%s' at usb-%s-%s, %s, %pM\n",
1428 udev
->dev
.driver
->name
,
1429 xdev
->bus
->bus_name
, xdev
->devpath
,
1430 dev
->driver_info
->description
,
1433 // ok, it's ready to go.
1434 usb_set_intfdata (udev
, dev
);
1436 netif_device_attach (net
);
1438 if (dev
->driver_info
->flags
& FLAG_LINK_INTR
)
1439 netif_carrier_off(net
);
1445 info
->unbind (dev
, udev
);
1452 EXPORT_SYMBOL_GPL(usbnet_probe
);
1454 /*-------------------------------------------------------------------------*/
1457 * suspend the whole driver as soon as the first interface is suspended
1458 * resume only when the last interface is resumed
1461 int usbnet_suspend (struct usb_interface
*intf
, pm_message_t message
)
1463 struct usbnet
*dev
= usb_get_intfdata(intf
);
1465 if (!dev
->suspend_count
++) {
1466 spin_lock_irq(&dev
->txq
.lock
);
1467 /* don't autosuspend while transmitting */
1468 if (dev
->txq
.qlen
&& (message
.event
& PM_EVENT_AUTO
)) {
1469 spin_unlock_irq(&dev
->txq
.lock
);
1472 set_bit(EVENT_DEV_ASLEEP
, &dev
->flags
);
1473 spin_unlock_irq(&dev
->txq
.lock
);
1476 * accelerate emptying of the rx and queues, to avoid
1477 * having everything error out.
1479 netif_device_detach (dev
->net
);
1480 usbnet_terminate_urbs(dev
);
1481 usb_kill_urb(dev
->interrupt
);
1484 * reattach so runtime management can use and
1487 netif_device_attach (dev
->net
);
1491 EXPORT_SYMBOL_GPL(usbnet_suspend
);
1493 int usbnet_resume (struct usb_interface
*intf
)
1495 struct usbnet
*dev
= usb_get_intfdata(intf
);
1496 struct sk_buff
*skb
;
1500 if (!--dev
->suspend_count
) {
1501 spin_lock_irq(&dev
->txq
.lock
);
1502 while ((res
= usb_get_from_anchor(&dev
->deferred
))) {
1504 skb
= (struct sk_buff
*)res
->context
;
1505 retval
= usb_submit_urb(res
, GFP_ATOMIC
);
1507 dev_kfree_skb_any(skb
);
1509 usb_autopm_put_interface_async(dev
->intf
);
1511 dev
->net
->trans_start
= jiffies
;
1512 __skb_queue_tail(&dev
->txq
, skb
);
1517 clear_bit(EVENT_DEV_ASLEEP
, &dev
->flags
);
1518 spin_unlock_irq(&dev
->txq
.lock
);
1519 if (!(dev
->txq
.qlen
>= TX_QLEN(dev
)))
1520 netif_start_queue(dev
->net
);
1521 tasklet_schedule (&dev
->bh
);
1525 EXPORT_SYMBOL_GPL(usbnet_resume
);
1528 /*-------------------------------------------------------------------------*/
1530 static int __init
usbnet_init(void)
1532 /* Compiler should optimize this out. */
1534 FIELD_SIZEOF(struct sk_buff
, cb
) < sizeof(struct skb_data
));
1536 random_ether_addr(node_id
);
1539 module_init(usbnet_init
);
1541 static void __exit
usbnet_exit(void)
1544 module_exit(usbnet_exit
);
1546 MODULE_AUTHOR("David Brownell");
1547 MODULE_DESCRIPTION("USB network driver framework");
1548 MODULE_LICENSE("GPL");