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 altsettings.
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 struct usbnet
*dev
= urb
->context
;
186 int status
= urb
->status
;
191 dev
->driver_info
->status(dev
, urb
);
194 /* software-driven interface shutdown */
195 case -ENOENT
: /* urb killed */
196 case -ESHUTDOWN
: /* hardware gone */
197 netif_dbg(dev
, ifdown
, dev
->net
,
198 "intr shutdown, code %d\n", status
);
201 /* NOTE: not throttling like RX/TX, since this endpoint
202 * already polls infrequently
205 netdev_dbg(dev
->net
, "intr status %d\n", status
);
209 if (!netif_running (dev
->net
))
212 status
= usb_submit_urb (urb
, GFP_ATOMIC
);
214 netif_err(dev
, timer
, dev
->net
,
215 "intr resubmit --> %d\n", status
);
218 static int init_status (struct usbnet
*dev
, struct usb_interface
*intf
)
225 if (!dev
->driver_info
->status
)
228 pipe
= usb_rcvintpipe (dev
->udev
,
229 dev
->status
->desc
.bEndpointAddress
230 & USB_ENDPOINT_NUMBER_MASK
);
231 maxp
= usb_maxpacket (dev
->udev
, pipe
, 0);
233 /* avoid 1 msec chatter: min 8 msec poll rate */
234 period
= max ((int) dev
->status
->desc
.bInterval
,
235 (dev
->udev
->speed
== USB_SPEED_HIGH
) ? 7 : 3);
237 buf
= kmalloc (maxp
, GFP_KERNEL
);
239 dev
->interrupt
= usb_alloc_urb (0, GFP_KERNEL
);
240 if (!dev
->interrupt
) {
244 usb_fill_int_urb(dev
->interrupt
, dev
->udev
, pipe
,
245 buf
, maxp
, intr_complete
, dev
, period
);
246 dev
->interrupt
->transfer_flags
|= URB_FREE_BUFFER
;
248 "status ep%din, %d bytes period %d\n",
249 usb_pipeendpoint(pipe
), maxp
, period
);
255 /* Passes this packet up the stack, updating its accounting.
256 * Some link protocols batch packets, so their rx_fixup paths
257 * can return clones as well as just modify the original skb.
259 void usbnet_skb_return (struct usbnet
*dev
, struct sk_buff
*skb
)
263 if (test_bit(EVENT_RX_PAUSED
, &dev
->flags
)) {
264 skb_queue_tail(&dev
->rxq_pause
, skb
);
268 skb
->protocol
= eth_type_trans (skb
, dev
->net
);
269 dev
->net
->stats
.rx_packets
++;
270 dev
->net
->stats
.rx_bytes
+= skb
->len
;
272 netif_dbg(dev
, rx_status
, dev
->net
, "< rx, len %zu, type 0x%x\n",
273 skb
->len
+ sizeof (struct ethhdr
), skb
->protocol
);
274 memset (skb
->cb
, 0, sizeof (struct skb_data
));
276 if (skb_defer_rx_timestamp(skb
))
279 status
= netif_rx (skb
);
280 if (status
!= NET_RX_SUCCESS
)
281 netif_dbg(dev
, rx_err
, dev
->net
,
282 "netif_rx status %d\n", status
);
284 EXPORT_SYMBOL_GPL(usbnet_skb_return
);
287 /*-------------------------------------------------------------------------
289 * Network Device Driver (peer link to "Host Device", from USB host)
291 *-------------------------------------------------------------------------*/
293 int usbnet_change_mtu (struct net_device
*net
, int new_mtu
)
295 struct usbnet
*dev
= netdev_priv(net
);
296 int ll_mtu
= new_mtu
+ net
->hard_header_len
;
297 int old_hard_mtu
= dev
->hard_mtu
;
298 int old_rx_urb_size
= dev
->rx_urb_size
;
302 // no second zero-length packet read wanted after mtu-sized packets
303 if ((ll_mtu
% dev
->maxpacket
) == 0)
307 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
308 if (dev
->rx_urb_size
== old_hard_mtu
) {
309 dev
->rx_urb_size
= dev
->hard_mtu
;
310 if (dev
->rx_urb_size
> old_rx_urb_size
)
311 usbnet_unlink_rx_urbs(dev
);
316 EXPORT_SYMBOL_GPL(usbnet_change_mtu
);
318 /* The caller must hold list->lock */
319 static void __usbnet_queue_skb(struct sk_buff_head
*list
,
320 struct sk_buff
*newsk
, enum skb_state state
)
322 struct skb_data
*entry
= (struct skb_data
*) newsk
->cb
;
324 __skb_queue_tail(list
, newsk
);
325 entry
->state
= state
;
328 /*-------------------------------------------------------------------------*/
330 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
331 * completion callbacks. 2.5 should have fixed those bugs...
334 static enum skb_state
defer_bh(struct usbnet
*dev
, struct sk_buff
*skb
,
335 struct sk_buff_head
*list
, enum skb_state state
)
338 enum skb_state old_state
;
339 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
341 spin_lock_irqsave(&list
->lock
, flags
);
342 old_state
= entry
->state
;
343 entry
->state
= state
;
344 __skb_unlink(skb
, list
);
345 spin_unlock(&list
->lock
);
346 spin_lock(&dev
->done
.lock
);
347 __skb_queue_tail(&dev
->done
, skb
);
348 if (dev
->done
.qlen
== 1)
349 tasklet_schedule(&dev
->bh
);
350 spin_unlock_irqrestore(&dev
->done
.lock
, flags
);
354 /* some work can't be done in tasklets, so we use keventd
356 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
357 * but tasklet_schedule() doesn't. hope the failure is rare.
359 void usbnet_defer_kevent (struct usbnet
*dev
, int work
)
361 set_bit (work
, &dev
->flags
);
362 if (!schedule_work (&dev
->kevent
))
363 netdev_err(dev
->net
, "kevent %d may have been dropped\n", work
);
365 netdev_dbg(dev
->net
, "kevent %d scheduled\n", work
);
367 EXPORT_SYMBOL_GPL(usbnet_defer_kevent
);
369 /*-------------------------------------------------------------------------*/
371 static void rx_complete (struct urb
*urb
);
373 static int rx_submit (struct usbnet
*dev
, struct urb
*urb
, gfp_t flags
)
376 struct skb_data
*entry
;
378 unsigned long lockflags
;
379 size_t size
= dev
->rx_urb_size
;
381 skb
= __netdev_alloc_skb_ip_align(dev
->net
, size
, flags
);
383 netif_dbg(dev
, rx_err
, dev
->net
, "no rx skb\n");
384 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
389 entry
= (struct skb_data
*) skb
->cb
;
394 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->in
,
395 skb
->data
, size
, rx_complete
, skb
);
397 spin_lock_irqsave (&dev
->rxq
.lock
, lockflags
);
399 if (netif_running (dev
->net
) &&
400 netif_device_present (dev
->net
) &&
401 !test_bit (EVENT_RX_HALT
, &dev
->flags
) &&
402 !test_bit (EVENT_DEV_ASLEEP
, &dev
->flags
)) {
403 switch (retval
= usb_submit_urb (urb
, GFP_ATOMIC
)) {
405 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
408 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
411 netif_dbg(dev
, ifdown
, dev
->net
, "device gone\n");
412 netif_device_detach (dev
->net
);
418 netif_dbg(dev
, rx_err
, dev
->net
,
419 "rx submit, %d\n", retval
);
420 tasklet_schedule (&dev
->bh
);
423 __usbnet_queue_skb(&dev
->rxq
, skb
, rx_start
);
426 netif_dbg(dev
, ifdown
, dev
->net
, "rx: stopped\n");
429 spin_unlock_irqrestore (&dev
->rxq
.lock
, lockflags
);
431 dev_kfree_skb_any (skb
);
438 /*-------------------------------------------------------------------------*/
440 static inline void rx_process (struct usbnet
*dev
, struct sk_buff
*skb
)
442 if (dev
->driver_info
->rx_fixup
&&
443 !dev
->driver_info
->rx_fixup (dev
, skb
)) {
444 /* With RX_ASSEMBLE, rx_fixup() must update counters */
445 if (!(dev
->driver_info
->flags
& FLAG_RX_ASSEMBLE
))
446 dev
->net
->stats
.rx_errors
++;
449 // else network stack removes extra byte if we forced a short packet
452 /* all data was already cloned from skb inside the driver */
453 if (dev
->driver_info
->flags
& FLAG_MULTI_PACKET
)
454 dev_kfree_skb_any(skb
);
456 usbnet_skb_return(dev
, skb
);
460 netif_dbg(dev
, rx_err
, dev
->net
, "drop\n");
461 dev
->net
->stats
.rx_errors
++;
463 skb_queue_tail(&dev
->done
, skb
);
466 /*-------------------------------------------------------------------------*/
468 static void rx_complete (struct urb
*urb
)
470 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
471 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
472 struct usbnet
*dev
= entry
->dev
;
473 int urb_status
= urb
->status
;
474 enum skb_state state
;
476 skb_put (skb
, urb
->actual_length
);
480 switch (urb_status
) {
483 if (skb
->len
< dev
->net
->hard_header_len
) {
485 dev
->net
->stats
.rx_errors
++;
486 dev
->net
->stats
.rx_length_errors
++;
487 netif_dbg(dev
, rx_err
, dev
->net
,
488 "rx length %d\n", skb
->len
);
492 /* stalls need manual reset. this is rare ... except that
493 * when going through USB 2.0 TTs, unplug appears this way.
494 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
495 * storm, recovering as needed.
498 dev
->net
->stats
.rx_errors
++;
499 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
502 /* software-driven interface shutdown */
503 case -ECONNRESET
: /* async unlink */
504 case -ESHUTDOWN
: /* hardware gone */
505 netif_dbg(dev
, ifdown
, dev
->net
,
506 "rx shutdown, code %d\n", urb_status
);
509 /* we get controller i/o faults during khubd disconnect() delays.
510 * throttle down resubmits, to avoid log floods; just temporarily,
511 * so we still recover when the fault isn't a khubd delay.
516 dev
->net
->stats
.rx_errors
++;
517 if (!timer_pending (&dev
->delay
)) {
518 mod_timer (&dev
->delay
, jiffies
+ THROTTLE_JIFFIES
);
519 netif_dbg(dev
, link
, dev
->net
,
520 "rx throttle %d\n", urb_status
);
528 /* data overrun ... flush fifo? */
530 dev
->net
->stats
.rx_over_errors
++;
535 dev
->net
->stats
.rx_errors
++;
536 netif_dbg(dev
, rx_err
, dev
->net
, "rx status %d\n", urb_status
);
540 state
= defer_bh(dev
, skb
, &dev
->rxq
, state
);
543 if (netif_running (dev
->net
) &&
544 !test_bit (EVENT_RX_HALT
, &dev
->flags
) &&
545 state
!= unlink_start
) {
546 rx_submit (dev
, urb
, GFP_ATOMIC
);
547 usb_mark_last_busy(dev
->udev
);
552 netif_dbg(dev
, rx_err
, dev
->net
, "no read resubmitted\n");
555 /*-------------------------------------------------------------------------*/
556 void usbnet_pause_rx(struct usbnet
*dev
)
558 set_bit(EVENT_RX_PAUSED
, &dev
->flags
);
560 netif_dbg(dev
, rx_status
, dev
->net
, "paused rx queue enabled\n");
562 EXPORT_SYMBOL_GPL(usbnet_pause_rx
);
564 void usbnet_resume_rx(struct usbnet
*dev
)
569 clear_bit(EVENT_RX_PAUSED
, &dev
->flags
);
571 while ((skb
= skb_dequeue(&dev
->rxq_pause
)) != NULL
) {
572 usbnet_skb_return(dev
, skb
);
576 tasklet_schedule(&dev
->bh
);
578 netif_dbg(dev
, rx_status
, dev
->net
,
579 "paused rx queue disabled, %d skbs requeued\n", num
);
581 EXPORT_SYMBOL_GPL(usbnet_resume_rx
);
583 void usbnet_purge_paused_rxq(struct usbnet
*dev
)
585 skb_queue_purge(&dev
->rxq_pause
);
587 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq
);
589 /*-------------------------------------------------------------------------*/
591 // unlink pending rx/tx; completion handlers do all other cleanup
593 static int unlink_urbs (struct usbnet
*dev
, struct sk_buff_head
*q
)
599 spin_lock_irqsave (&q
->lock
, flags
);
600 while (!skb_queue_empty(q
)) {
601 struct skb_data
*entry
;
605 skb_queue_walk(q
, skb
) {
606 entry
= (struct skb_data
*) skb
->cb
;
607 if (entry
->state
!= unlink_start
)
612 entry
->state
= unlink_start
;
616 * Get reference count of the URB to avoid it to be
617 * freed during usb_unlink_urb, which may trigger
618 * use-after-free problem inside usb_unlink_urb since
619 * usb_unlink_urb is always racing with .complete
620 * handler(include defer_bh).
623 spin_unlock_irqrestore(&q
->lock
, flags
);
624 // during some PM-driven resume scenarios,
625 // these (async) unlinks complete immediately
626 retval
= usb_unlink_urb (urb
);
627 if (retval
!= -EINPROGRESS
&& retval
!= 0)
628 netdev_dbg(dev
->net
, "unlink urb err, %d\n", retval
);
632 spin_lock_irqsave(&q
->lock
, flags
);
634 spin_unlock_irqrestore (&q
->lock
, flags
);
638 // Flush all pending rx urbs
639 // minidrivers may need to do this when the MTU changes
641 void usbnet_unlink_rx_urbs(struct usbnet
*dev
)
643 if (netif_running(dev
->net
)) {
644 (void) unlink_urbs (dev
, &dev
->rxq
);
645 tasklet_schedule(&dev
->bh
);
648 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs
);
650 /*-------------------------------------------------------------------------*/
652 // precondition: never called in_interrupt
653 static void usbnet_terminate_urbs(struct usbnet
*dev
)
655 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup
);
656 DECLARE_WAITQUEUE(wait
, current
);
659 /* ensure there are no more active urbs */
660 add_wait_queue(&unlink_wakeup
, &wait
);
661 set_current_state(TASK_UNINTERRUPTIBLE
);
662 dev
->wait
= &unlink_wakeup
;
663 temp
= unlink_urbs(dev
, &dev
->txq
) +
664 unlink_urbs(dev
, &dev
->rxq
);
666 /* maybe wait for deletions to finish. */
667 while (!skb_queue_empty(&dev
->rxq
)
668 && !skb_queue_empty(&dev
->txq
)
669 && !skb_queue_empty(&dev
->done
)) {
670 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS
));
671 set_current_state(TASK_UNINTERRUPTIBLE
);
672 netif_dbg(dev
, ifdown
, dev
->net
,
673 "waited for %d urb completions\n", temp
);
675 set_current_state(TASK_RUNNING
);
677 remove_wait_queue(&unlink_wakeup
, &wait
);
680 int usbnet_stop (struct net_device
*net
)
682 struct usbnet
*dev
= netdev_priv(net
);
683 struct driver_info
*info
= dev
->driver_info
;
686 clear_bit(EVENT_DEV_OPEN
, &dev
->flags
);
687 netif_stop_queue (net
);
689 netif_info(dev
, ifdown
, dev
->net
,
690 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
691 net
->stats
.rx_packets
, net
->stats
.tx_packets
,
692 net
->stats
.rx_errors
, net
->stats
.tx_errors
);
694 /* allow minidriver to stop correctly (wireless devices to turn off
697 retval
= info
->stop(dev
);
699 netif_info(dev
, ifdown
, dev
->net
,
700 "stop fail (%d) usbnet usb-%s-%s, %s\n",
702 dev
->udev
->bus
->bus_name
, dev
->udev
->devpath
,
706 if (!(info
->flags
& FLAG_AVOID_UNLINK_URBS
))
707 usbnet_terminate_urbs(dev
);
709 usb_kill_urb(dev
->interrupt
);
711 usbnet_purge_paused_rxq(dev
);
713 /* deferred work (task, timer, softirq) must also stop.
714 * can't flush_scheduled_work() until we drop rtnl (later),
715 * else workers could deadlock; so make workers a NOP.
718 del_timer_sync (&dev
->delay
);
719 tasklet_kill (&dev
->bh
);
720 if (info
->manage_power
)
721 info
->manage_power(dev
, 0);
723 usb_autopm_put_interface(dev
->intf
);
727 EXPORT_SYMBOL_GPL(usbnet_stop
);
729 /*-------------------------------------------------------------------------*/
731 // posts reads, and enables write queuing
733 // precondition: never called in_interrupt
735 int usbnet_open (struct net_device
*net
)
737 struct usbnet
*dev
= netdev_priv(net
);
739 struct driver_info
*info
= dev
->driver_info
;
741 if ((retval
= usb_autopm_get_interface(dev
->intf
)) < 0) {
742 netif_info(dev
, ifup
, dev
->net
,
743 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
745 dev
->udev
->bus
->bus_name
,
751 // put into "known safe" state
752 if (info
->reset
&& (retval
= info
->reset (dev
)) < 0) {
753 netif_info(dev
, ifup
, dev
->net
,
754 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
756 dev
->udev
->bus
->bus_name
,
762 // insist peer be connected
763 if (info
->check_connect
&& (retval
= info
->check_connect (dev
)) < 0) {
764 netif_dbg(dev
, ifup
, dev
->net
, "can't open; %d\n", retval
);
768 /* start any status interrupt transfer */
769 if (dev
->interrupt
) {
770 retval
= usb_submit_urb (dev
->interrupt
, GFP_KERNEL
);
772 netif_err(dev
, ifup
, dev
->net
,
773 "intr submit %d\n", retval
);
778 set_bit(EVENT_DEV_OPEN
, &dev
->flags
);
779 netif_start_queue (net
);
780 netif_info(dev
, ifup
, dev
->net
,
781 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
782 (int)RX_QLEN(dev
), (int)TX_QLEN(dev
),
784 (dev
->driver_info
->flags
& FLAG_FRAMING_NC
) ? "NetChip" :
785 (dev
->driver_info
->flags
& FLAG_FRAMING_GL
) ? "GeneSys" :
786 (dev
->driver_info
->flags
& FLAG_FRAMING_Z
) ? "Zaurus" :
787 (dev
->driver_info
->flags
& FLAG_FRAMING_RN
) ? "RNDIS" :
788 (dev
->driver_info
->flags
& FLAG_FRAMING_AX
) ? "ASIX" :
791 // delay posting reads until we're fully open
792 tasklet_schedule (&dev
->bh
);
793 if (info
->manage_power
) {
794 retval
= info
->manage_power(dev
, 1);
796 goto done_manage_power_error
;
797 usb_autopm_put_interface(dev
->intf
);
801 done_manage_power_error
:
802 clear_bit(EVENT_DEV_OPEN
, &dev
->flags
);
804 usb_autopm_put_interface(dev
->intf
);
808 EXPORT_SYMBOL_GPL(usbnet_open
);
810 /*-------------------------------------------------------------------------*/
812 /* ethtool methods; minidrivers may need to add some more, but
813 * they'll probably want to use this base set.
816 int usbnet_get_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
818 struct usbnet
*dev
= netdev_priv(net
);
820 if (!dev
->mii
.mdio_read
)
823 return mii_ethtool_gset(&dev
->mii
, cmd
);
825 EXPORT_SYMBOL_GPL(usbnet_get_settings
);
827 int usbnet_set_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
829 struct usbnet
*dev
= netdev_priv(net
);
832 if (!dev
->mii
.mdio_write
)
835 retval
= mii_ethtool_sset(&dev
->mii
, cmd
);
837 /* link speed/duplex might have changed */
838 if (dev
->driver_info
->link_reset
)
839 dev
->driver_info
->link_reset(dev
);
844 EXPORT_SYMBOL_GPL(usbnet_set_settings
);
846 u32
usbnet_get_link (struct net_device
*net
)
848 struct usbnet
*dev
= netdev_priv(net
);
850 /* If a check_connect is defined, return its result */
851 if (dev
->driver_info
->check_connect
)
852 return dev
->driver_info
->check_connect (dev
) == 0;
854 /* if the device has mii operations, use those */
855 if (dev
->mii
.mdio_read
)
856 return mii_link_ok(&dev
->mii
);
858 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
859 return ethtool_op_get_link(net
);
861 EXPORT_SYMBOL_GPL(usbnet_get_link
);
863 int usbnet_nway_reset(struct net_device
*net
)
865 struct usbnet
*dev
= netdev_priv(net
);
867 if (!dev
->mii
.mdio_write
)
870 return mii_nway_restart(&dev
->mii
);
872 EXPORT_SYMBOL_GPL(usbnet_nway_reset
);
874 void usbnet_get_drvinfo (struct net_device
*net
, struct ethtool_drvinfo
*info
)
876 struct usbnet
*dev
= netdev_priv(net
);
878 strlcpy (info
->driver
, dev
->driver_name
, sizeof info
->driver
);
879 strlcpy (info
->version
, DRIVER_VERSION
, sizeof info
->version
);
880 strlcpy (info
->fw_version
, dev
->driver_info
->description
,
881 sizeof info
->fw_version
);
882 usb_make_path (dev
->udev
, info
->bus_info
, sizeof info
->bus_info
);
884 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo
);
886 u32
usbnet_get_msglevel (struct net_device
*net
)
888 struct usbnet
*dev
= netdev_priv(net
);
890 return dev
->msg_enable
;
892 EXPORT_SYMBOL_GPL(usbnet_get_msglevel
);
894 void usbnet_set_msglevel (struct net_device
*net
, u32 level
)
896 struct usbnet
*dev
= netdev_priv(net
);
898 dev
->msg_enable
= level
;
900 EXPORT_SYMBOL_GPL(usbnet_set_msglevel
);
902 /* drivers may override default ethtool_ops in their bind() routine */
903 static const struct ethtool_ops usbnet_ethtool_ops
= {
904 .get_settings
= usbnet_get_settings
,
905 .set_settings
= usbnet_set_settings
,
906 .get_link
= usbnet_get_link
,
907 .nway_reset
= usbnet_nway_reset
,
908 .get_drvinfo
= usbnet_get_drvinfo
,
909 .get_msglevel
= usbnet_get_msglevel
,
910 .set_msglevel
= usbnet_set_msglevel
,
911 .get_ts_info
= ethtool_op_get_ts_info
,
914 /*-------------------------------------------------------------------------*/
916 /* work that cannot be done in interrupt context uses keventd.
918 * NOTE: with 2.5 we could do more of this using completion callbacks,
919 * especially now that control transfers can be queued.
922 kevent (struct work_struct
*work
)
925 container_of(work
, struct usbnet
, kevent
);
928 /* usb_clear_halt() needs a thread context */
929 if (test_bit (EVENT_TX_HALT
, &dev
->flags
)) {
930 unlink_urbs (dev
, &dev
->txq
);
931 status
= usb_autopm_get_interface(dev
->intf
);
934 status
= usb_clear_halt (dev
->udev
, dev
->out
);
935 usb_autopm_put_interface(dev
->intf
);
938 status
!= -ESHUTDOWN
) {
939 if (netif_msg_tx_err (dev
))
941 netdev_err(dev
->net
, "can't clear tx halt, status %d\n",
944 clear_bit (EVENT_TX_HALT
, &dev
->flags
);
945 if (status
!= -ESHUTDOWN
)
946 netif_wake_queue (dev
->net
);
949 if (test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
950 unlink_urbs (dev
, &dev
->rxq
);
951 status
= usb_autopm_get_interface(dev
->intf
);
954 status
= usb_clear_halt (dev
->udev
, dev
->in
);
955 usb_autopm_put_interface(dev
->intf
);
958 status
!= -ESHUTDOWN
) {
959 if (netif_msg_rx_err (dev
))
961 netdev_err(dev
->net
, "can't clear rx halt, status %d\n",
964 clear_bit (EVENT_RX_HALT
, &dev
->flags
);
965 tasklet_schedule (&dev
->bh
);
969 /* tasklet could resubmit itself forever if memory is tight */
970 if (test_bit (EVENT_RX_MEMORY
, &dev
->flags
)) {
971 struct urb
*urb
= NULL
;
974 if (netif_running (dev
->net
))
975 urb
= usb_alloc_urb (0, GFP_KERNEL
);
977 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
979 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
980 status
= usb_autopm_get_interface(dev
->intf
);
985 if (rx_submit (dev
, urb
, GFP_KERNEL
) == -ENOLINK
)
987 usb_autopm_put_interface(dev
->intf
);
990 tasklet_schedule (&dev
->bh
);
994 if (test_bit (EVENT_LINK_RESET
, &dev
->flags
)) {
995 struct driver_info
*info
= dev
->driver_info
;
998 clear_bit (EVENT_LINK_RESET
, &dev
->flags
);
999 status
= usb_autopm_get_interface(dev
->intf
);
1002 if(info
->link_reset
&& (retval
= info
->link_reset(dev
)) < 0) {
1003 usb_autopm_put_interface(dev
->intf
);
1005 netdev_info(dev
->net
, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1007 dev
->udev
->bus
->bus_name
,
1011 usb_autopm_put_interface(dev
->intf
);
1016 netdev_dbg(dev
->net
, "kevent done, flags = 0x%lx\n", dev
->flags
);
1019 /*-------------------------------------------------------------------------*/
1021 static void tx_complete (struct urb
*urb
)
1023 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
1024 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
1025 struct usbnet
*dev
= entry
->dev
;
1027 if (urb
->status
== 0) {
1028 if (!(dev
->driver_info
->flags
& FLAG_MULTI_PACKET
))
1029 dev
->net
->stats
.tx_packets
++;
1030 dev
->net
->stats
.tx_bytes
+= entry
->length
;
1032 dev
->net
->stats
.tx_errors
++;
1034 switch (urb
->status
) {
1036 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
1039 /* software-driven interface shutdown */
1040 case -ECONNRESET
: // async unlink
1041 case -ESHUTDOWN
: // hardware gone
1044 // like rx, tx gets controller i/o faults during khubd delays
1045 // and so it uses the same throttling mechanism.
1049 usb_mark_last_busy(dev
->udev
);
1050 if (!timer_pending (&dev
->delay
)) {
1051 mod_timer (&dev
->delay
,
1052 jiffies
+ THROTTLE_JIFFIES
);
1053 netif_dbg(dev
, link
, dev
->net
,
1054 "tx throttle %d\n", urb
->status
);
1056 netif_stop_queue (dev
->net
);
1059 netif_dbg(dev
, tx_err
, dev
->net
,
1060 "tx err %d\n", entry
->urb
->status
);
1065 usb_autopm_put_interface_async(dev
->intf
);
1066 (void) defer_bh(dev
, skb
, &dev
->txq
, tx_done
);
1069 /*-------------------------------------------------------------------------*/
1071 void usbnet_tx_timeout (struct net_device
*net
)
1073 struct usbnet
*dev
= netdev_priv(net
);
1075 unlink_urbs (dev
, &dev
->txq
);
1076 tasklet_schedule (&dev
->bh
);
1078 // FIXME: device recovery -- reset?
1080 EXPORT_SYMBOL_GPL(usbnet_tx_timeout
);
1082 /*-------------------------------------------------------------------------*/
1084 netdev_tx_t
usbnet_start_xmit (struct sk_buff
*skb
,
1085 struct net_device
*net
)
1087 struct usbnet
*dev
= netdev_priv(net
);
1089 struct urb
*urb
= NULL
;
1090 struct skb_data
*entry
;
1091 struct driver_info
*info
= dev
->driver_info
;
1092 unsigned long flags
;
1096 skb_tx_timestamp(skb
);
1098 // some devices want funky USB-level framing, for
1099 // win32 driver (usually) and/or hardware quirks
1100 if (info
->tx_fixup
) {
1101 skb
= info
->tx_fixup (dev
, skb
, GFP_ATOMIC
);
1103 if (netif_msg_tx_err(dev
)) {
1104 netif_dbg(dev
, tx_err
, dev
->net
, "can't tx_fixup skb\n");
1107 /* cdc_ncm collected packet; waits for more */
1114 if (!(urb
= usb_alloc_urb (0, GFP_ATOMIC
))) {
1115 netif_dbg(dev
, tx_err
, dev
->net
, "no urb\n");
1119 entry
= (struct skb_data
*) skb
->cb
;
1122 entry
->length
= length
;
1124 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->out
,
1125 skb
->data
, skb
->len
, tx_complete
, skb
);
1127 /* don't assume the hardware handles USB_ZERO_PACKET
1128 * NOTE: strictly conforming cdc-ether devices should expect
1129 * the ZLP here, but ignore the one-byte packet.
1130 * NOTE2: CDC NCM specification is different from CDC ECM when
1131 * handling ZLP/short packets, so cdc_ncm driver will make short
1132 * packet itself if needed.
1134 if (length
% dev
->maxpacket
== 0) {
1135 if (!(info
->flags
& FLAG_SEND_ZLP
)) {
1136 if (!(info
->flags
& FLAG_MULTI_PACKET
)) {
1137 urb
->transfer_buffer_length
++;
1138 if (skb_tailroom(skb
)) {
1139 skb
->data
[skb
->len
] = 0;
1144 urb
->transfer_flags
|= URB_ZERO_PACKET
;
1147 spin_lock_irqsave(&dev
->txq
.lock
, flags
);
1148 retval
= usb_autopm_get_interface_async(dev
->intf
);
1150 spin_unlock_irqrestore(&dev
->txq
.lock
, flags
);
1155 /* if this triggers the device is still a sleep */
1156 if (test_bit(EVENT_DEV_ASLEEP
, &dev
->flags
)) {
1157 /* transmission will be done in resume */
1158 usb_anchor_urb(urb
, &dev
->deferred
);
1159 /* no use to process more packets */
1160 netif_stop_queue(net
);
1161 spin_unlock_irqrestore(&dev
->txq
.lock
, flags
);
1162 netdev_dbg(dev
->net
, "Delaying transmission for resumption\n");
1167 switch ((retval
= usb_submit_urb (urb
, GFP_ATOMIC
))) {
1169 netif_stop_queue (net
);
1170 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
1171 usb_autopm_put_interface_async(dev
->intf
);
1174 usb_autopm_put_interface_async(dev
->intf
);
1175 netif_dbg(dev
, tx_err
, dev
->net
,
1176 "tx: submit urb err %d\n", retval
);
1179 net
->trans_start
= jiffies
;
1180 __usbnet_queue_skb(&dev
->txq
, skb
, tx_start
);
1181 if (dev
->txq
.qlen
>= TX_QLEN (dev
))
1182 netif_stop_queue (net
);
1184 spin_unlock_irqrestore (&dev
->txq
.lock
, flags
);
1187 netif_dbg(dev
, tx_err
, dev
->net
, "drop, code %d\n", retval
);
1189 dev
->net
->stats
.tx_dropped
++;
1192 dev_kfree_skb_any (skb
);
1195 netif_dbg(dev
, tx_queued
, dev
->net
,
1196 "> tx, len %d, type 0x%x\n", length
, skb
->protocol
);
1200 return NETDEV_TX_OK
;
1202 EXPORT_SYMBOL_GPL(usbnet_start_xmit
);
1204 static void rx_alloc_submit(struct usbnet
*dev
, gfp_t flags
)
1209 /* don't refill the queue all at once */
1210 for (i
= 0; i
< 10 && dev
->rxq
.qlen
< RX_QLEN(dev
); i
++) {
1211 urb
= usb_alloc_urb(0, flags
);
1213 if (rx_submit(dev
, urb
, flags
) == -ENOLINK
)
1219 /*-------------------------------------------------------------------------*/
1221 // tasklet (work deferred from completions, in_irq) or timer
1223 static void usbnet_bh (unsigned long param
)
1225 struct usbnet
*dev
= (struct usbnet
*) param
;
1226 struct sk_buff
*skb
;
1227 struct skb_data
*entry
;
1229 while ((skb
= skb_dequeue (&dev
->done
))) {
1230 entry
= (struct skb_data
*) skb
->cb
;
1231 switch (entry
->state
) {
1233 entry
->state
= rx_cleanup
;
1234 rx_process (dev
, skb
);
1238 usb_free_urb (entry
->urb
);
1239 dev_kfree_skb (skb
);
1242 netdev_dbg(dev
->net
, "bogus skb state %d\n", entry
->state
);
1246 // waiting for all pending urbs to complete?
1248 if ((dev
->txq
.qlen
+ dev
->rxq
.qlen
+ dev
->done
.qlen
) == 0) {
1249 wake_up (dev
->wait
);
1252 // or are we maybe short a few urbs?
1253 } else if (netif_running (dev
->net
) &&
1254 netif_device_present (dev
->net
) &&
1255 !timer_pending (&dev
->delay
) &&
1256 !test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
1257 int temp
= dev
->rxq
.qlen
;
1259 if (temp
< RX_QLEN(dev
)) {
1260 rx_alloc_submit(dev
, GFP_ATOMIC
);
1261 if (temp
!= dev
->rxq
.qlen
)
1262 netif_dbg(dev
, link
, dev
->net
,
1263 "rxqlen %d --> %d\n",
1264 temp
, dev
->rxq
.qlen
);
1265 if (dev
->rxq
.qlen
< RX_QLEN(dev
))
1266 tasklet_schedule (&dev
->bh
);
1268 if (dev
->txq
.qlen
< TX_QLEN (dev
))
1269 netif_wake_queue (dev
->net
);
1274 /*-------------------------------------------------------------------------
1276 * USB Device Driver support
1278 *-------------------------------------------------------------------------*/
1280 // precondition: never called in_interrupt
1282 void usbnet_disconnect (struct usb_interface
*intf
)
1285 struct usb_device
*xdev
;
1286 struct net_device
*net
;
1288 dev
= usb_get_intfdata(intf
);
1289 usb_set_intfdata(intf
, NULL
);
1293 xdev
= interface_to_usbdev (intf
);
1295 netif_info(dev
, probe
, dev
->net
, "unregister '%s' usb-%s-%s, %s\n",
1296 intf
->dev
.driver
->name
,
1297 xdev
->bus
->bus_name
, xdev
->devpath
,
1298 dev
->driver_info
->description
);
1301 unregister_netdev (net
);
1303 cancel_work_sync(&dev
->kevent
);
1305 if (dev
->driver_info
->unbind
)
1306 dev
->driver_info
->unbind (dev
, intf
);
1308 usb_kill_urb(dev
->interrupt
);
1309 usb_free_urb(dev
->interrupt
);
1313 EXPORT_SYMBOL_GPL(usbnet_disconnect
);
1315 static const struct net_device_ops usbnet_netdev_ops
= {
1316 .ndo_open
= usbnet_open
,
1317 .ndo_stop
= usbnet_stop
,
1318 .ndo_start_xmit
= usbnet_start_xmit
,
1319 .ndo_tx_timeout
= usbnet_tx_timeout
,
1320 .ndo_change_mtu
= usbnet_change_mtu
,
1321 .ndo_set_mac_address
= eth_mac_addr
,
1322 .ndo_validate_addr
= eth_validate_addr
,
1325 /*-------------------------------------------------------------------------*/
1327 // precondition: never called in_interrupt
1329 static struct device_type wlan_type
= {
1333 static struct device_type wwan_type
= {
1338 usbnet_probe (struct usb_interface
*udev
, const struct usb_device_id
*prod
)
1341 struct net_device
*net
;
1342 struct usb_host_interface
*interface
;
1343 struct driver_info
*info
;
1344 struct usb_device
*xdev
;
1347 struct usb_driver
*driver
= to_usb_driver(udev
->dev
.driver
);
1349 /* usbnet already took usb runtime pm, so have to enable the feature
1350 * for usb interface, otherwise usb_autopm_get_interface may return
1351 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1353 if (!driver
->supports_autosuspend
) {
1354 driver
->supports_autosuspend
= 1;
1355 pm_runtime_enable(&udev
->dev
);
1358 name
= udev
->dev
.driver
->name
;
1359 info
= (struct driver_info
*) prod
->driver_info
;
1361 dev_dbg (&udev
->dev
, "blacklisted by %s\n", name
);
1364 xdev
= interface_to_usbdev (udev
);
1365 interface
= udev
->cur_altsetting
;
1369 // set up our own records
1370 net
= alloc_etherdev(sizeof(*dev
));
1374 /* netdev_printk() needs this so do it as early as possible */
1375 SET_NETDEV_DEV(net
, &udev
->dev
);
1377 dev
= netdev_priv(net
);
1380 dev
->driver_info
= info
;
1381 dev
->driver_name
= name
;
1382 dev
->msg_enable
= netif_msg_init (msg_level
, NETIF_MSG_DRV
1383 | NETIF_MSG_PROBE
| NETIF_MSG_LINK
);
1384 skb_queue_head_init (&dev
->rxq
);
1385 skb_queue_head_init (&dev
->txq
);
1386 skb_queue_head_init (&dev
->done
);
1387 skb_queue_head_init(&dev
->rxq_pause
);
1388 dev
->bh
.func
= usbnet_bh
;
1389 dev
->bh
.data
= (unsigned long) dev
;
1390 INIT_WORK (&dev
->kevent
, kevent
);
1391 init_usb_anchor(&dev
->deferred
);
1392 dev
->delay
.function
= usbnet_bh
;
1393 dev
->delay
.data
= (unsigned long) dev
;
1394 init_timer (&dev
->delay
);
1395 mutex_init (&dev
->phy_mutex
);
1398 strcpy (net
->name
, "usb%d");
1399 memcpy (net
->dev_addr
, node_id
, sizeof node_id
);
1401 /* rx and tx sides can use different message sizes;
1402 * bind() should set rx_urb_size in that case.
1404 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
1406 // dma_supported() is deeply broken on almost all architectures
1407 // possible with some EHCI controllers
1408 if (dma_supported (&udev
->dev
, DMA_BIT_MASK(64)))
1409 net
->features
|= NETIF_F_HIGHDMA
;
1412 net
->netdev_ops
= &usbnet_netdev_ops
;
1413 net
->watchdog_timeo
= TX_TIMEOUT_JIFFIES
;
1414 net
->ethtool_ops
= &usbnet_ethtool_ops
;
1416 // allow device-specific bind/init procedures
1417 // NOTE net->name still not usable ...
1419 status
= info
->bind (dev
, udev
);
1423 // heuristic: "usb%d" for links we know are two-host,
1424 // else "eth%d" when there's reasonable doubt. userspace
1425 // can rename the link if it knows better.
1426 if ((dev
->driver_info
->flags
& FLAG_ETHER
) != 0 &&
1427 ((dev
->driver_info
->flags
& FLAG_POINTTOPOINT
) == 0 ||
1428 (net
->dev_addr
[0] & 0x02) == 0))
1429 strcpy (net
->name
, "eth%d");
1430 /* WLAN devices should always be named "wlan%d" */
1431 if ((dev
->driver_info
->flags
& FLAG_WLAN
) != 0)
1432 strcpy(net
->name
, "wlan%d");
1433 /* WWAN devices should always be named "wwan%d" */
1434 if ((dev
->driver_info
->flags
& FLAG_WWAN
) != 0)
1435 strcpy(net
->name
, "wwan%d");
1437 /* maybe the remote can't receive an Ethernet MTU */
1438 if (net
->mtu
> (dev
->hard_mtu
- net
->hard_header_len
))
1439 net
->mtu
= dev
->hard_mtu
- net
->hard_header_len
;
1440 } else if (!info
->in
|| !info
->out
)
1441 status
= usbnet_get_endpoints (dev
, udev
);
1443 dev
->in
= usb_rcvbulkpipe (xdev
, info
->in
);
1444 dev
->out
= usb_sndbulkpipe (xdev
, info
->out
);
1445 if (!(info
->flags
& FLAG_NO_SETINT
))
1446 status
= usb_set_interface (xdev
,
1447 interface
->desc
.bInterfaceNumber
,
1448 interface
->desc
.bAlternateSetting
);
1453 if (status
>= 0 && dev
->status
)
1454 status
= init_status (dev
, udev
);
1458 if (!dev
->rx_urb_size
)
1459 dev
->rx_urb_size
= dev
->hard_mtu
;
1460 dev
->maxpacket
= usb_maxpacket (dev
->udev
, dev
->out
, 1);
1462 if ((dev
->driver_info
->flags
& FLAG_WLAN
) != 0)
1463 SET_NETDEV_DEVTYPE(net
, &wlan_type
);
1464 if ((dev
->driver_info
->flags
& FLAG_WWAN
) != 0)
1465 SET_NETDEV_DEVTYPE(net
, &wwan_type
);
1467 status
= register_netdev (net
);
1470 netif_info(dev
, probe
, dev
->net
,
1471 "register '%s' at usb-%s-%s, %s, %pM\n",
1472 udev
->dev
.driver
->name
,
1473 xdev
->bus
->bus_name
, xdev
->devpath
,
1474 dev
->driver_info
->description
,
1477 // ok, it's ready to go.
1478 usb_set_intfdata (udev
, dev
);
1480 netif_device_attach (net
);
1482 if (dev
->driver_info
->flags
& FLAG_LINK_INTR
)
1483 netif_carrier_off(net
);
1488 usb_free_urb(dev
->interrupt
);
1491 info
->unbind (dev
, udev
);
1497 EXPORT_SYMBOL_GPL(usbnet_probe
);
1499 /*-------------------------------------------------------------------------*/
1502 * suspend the whole driver as soon as the first interface is suspended
1503 * resume only when the last interface is resumed
1506 int usbnet_suspend (struct usb_interface
*intf
, pm_message_t message
)
1508 struct usbnet
*dev
= usb_get_intfdata(intf
);
1510 if (!dev
->suspend_count
++) {
1511 spin_lock_irq(&dev
->txq
.lock
);
1512 /* don't autosuspend while transmitting */
1513 if (dev
->txq
.qlen
&& PMSG_IS_AUTO(message
)) {
1514 dev
->suspend_count
--;
1515 spin_unlock_irq(&dev
->txq
.lock
);
1518 set_bit(EVENT_DEV_ASLEEP
, &dev
->flags
);
1519 spin_unlock_irq(&dev
->txq
.lock
);
1522 * accelerate emptying of the rx and queues, to avoid
1523 * having everything error out.
1525 netif_device_detach (dev
->net
);
1526 usbnet_terminate_urbs(dev
);
1527 usb_kill_urb(dev
->interrupt
);
1530 * reattach so runtime management can use and
1533 netif_device_attach (dev
->net
);
1537 EXPORT_SYMBOL_GPL(usbnet_suspend
);
1539 int usbnet_resume (struct usb_interface
*intf
)
1541 struct usbnet
*dev
= usb_get_intfdata(intf
);
1542 struct sk_buff
*skb
;
1546 if (!--dev
->suspend_count
) {
1547 /* resume interrupt URBs */
1548 if (dev
->interrupt
&& test_bit(EVENT_DEV_OPEN
, &dev
->flags
))
1549 usb_submit_urb(dev
->interrupt
, GFP_NOIO
);
1551 spin_lock_irq(&dev
->txq
.lock
);
1552 while ((res
= usb_get_from_anchor(&dev
->deferred
))) {
1554 skb
= (struct sk_buff
*)res
->context
;
1555 retval
= usb_submit_urb(res
, GFP_ATOMIC
);
1557 dev_kfree_skb_any(skb
);
1559 usb_autopm_put_interface_async(dev
->intf
);
1561 dev
->net
->trans_start
= jiffies
;
1562 __skb_queue_tail(&dev
->txq
, skb
);
1567 clear_bit(EVENT_DEV_ASLEEP
, &dev
->flags
);
1568 spin_unlock_irq(&dev
->txq
.lock
);
1570 if (test_bit(EVENT_DEV_OPEN
, &dev
->flags
)) {
1571 /* handle remote wakeup ASAP */
1573 netif_device_present(dev
->net
) &&
1574 !timer_pending(&dev
->delay
) &&
1575 !test_bit(EVENT_RX_HALT
, &dev
->flags
))
1576 rx_alloc_submit(dev
, GFP_KERNEL
);
1578 if (!(dev
->txq
.qlen
>= TX_QLEN(dev
)))
1579 netif_tx_wake_all_queues(dev
->net
);
1580 tasklet_schedule (&dev
->bh
);
1585 EXPORT_SYMBOL_GPL(usbnet_resume
);
1588 /*-------------------------------------------------------------------------*/
1590 static int __init
usbnet_init(void)
1592 /* Compiler should optimize this out. */
1594 FIELD_SIZEOF(struct sk_buff
, cb
) < sizeof(struct skb_data
));
1596 eth_random_addr(node_id
);
1599 module_init(usbnet_init
);
1601 static void __exit
usbnet_exit(void)
1604 module_exit(usbnet_exit
);
1606 MODULE_AUTHOR("David Brownell");
1607 MODULE_DESCRIPTION("USB network driver framework");
1608 MODULE_LICENSE("GPL");