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 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
);
213 dev
->interrupt
->transfer_flags
|= URB_FREE_BUFFER
;
215 "status ep%din, %d bytes period %d\n",
216 usb_pipeendpoint(pipe
), maxp
, period
);
222 /* Passes this packet up the stack, updating its accounting.
223 * Some link protocols batch packets, so their rx_fixup paths
224 * can return clones as well as just modify the original skb.
226 void usbnet_skb_return (struct usbnet
*dev
, struct sk_buff
*skb
)
230 if (test_bit(EVENT_RX_PAUSED
, &dev
->flags
)) {
231 skb_queue_tail(&dev
->rxq_pause
, skb
);
235 skb
->protocol
= eth_type_trans (skb
, dev
->net
);
236 dev
->net
->stats
.rx_packets
++;
237 dev
->net
->stats
.rx_bytes
+= skb
->len
;
239 netif_dbg(dev
, rx_status
, dev
->net
, "< rx, len %zu, type 0x%x\n",
240 skb
->len
+ sizeof (struct ethhdr
), skb
->protocol
);
241 memset (skb
->cb
, 0, sizeof (struct skb_data
));
243 if (skb_defer_rx_timestamp(skb
))
246 status
= netif_rx (skb
);
247 if (status
!= NET_RX_SUCCESS
)
248 netif_dbg(dev
, rx_err
, dev
->net
,
249 "netif_rx status %d\n", status
);
251 EXPORT_SYMBOL_GPL(usbnet_skb_return
);
254 /*-------------------------------------------------------------------------
256 * Network Device Driver (peer link to "Host Device", from USB host)
258 *-------------------------------------------------------------------------*/
260 int usbnet_change_mtu (struct net_device
*net
, int new_mtu
)
262 struct usbnet
*dev
= netdev_priv(net
);
263 int ll_mtu
= new_mtu
+ net
->hard_header_len
;
264 int old_hard_mtu
= dev
->hard_mtu
;
265 int old_rx_urb_size
= dev
->rx_urb_size
;
269 // no second zero-length packet read wanted after mtu-sized packets
270 if ((ll_mtu
% dev
->maxpacket
) == 0)
274 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
275 if (dev
->rx_urb_size
== old_hard_mtu
) {
276 dev
->rx_urb_size
= dev
->hard_mtu
;
277 if (dev
->rx_urb_size
> old_rx_urb_size
)
278 usbnet_unlink_rx_urbs(dev
);
283 EXPORT_SYMBOL_GPL(usbnet_change_mtu
);
285 /* The caller must hold list->lock */
286 static void __usbnet_queue_skb(struct sk_buff_head
*list
,
287 struct sk_buff
*newsk
, enum skb_state state
)
289 struct skb_data
*entry
= (struct skb_data
*) newsk
->cb
;
291 __skb_queue_tail(list
, newsk
);
292 entry
->state
= state
;
295 /*-------------------------------------------------------------------------*/
297 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
298 * completion callbacks. 2.5 should have fixed those bugs...
301 static enum skb_state
defer_bh(struct usbnet
*dev
, struct sk_buff
*skb
,
302 struct sk_buff_head
*list
, enum skb_state state
)
305 enum skb_state old_state
;
306 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
308 spin_lock_irqsave(&list
->lock
, flags
);
309 old_state
= entry
->state
;
310 entry
->state
= state
;
311 __skb_unlink(skb
, list
);
312 spin_unlock(&list
->lock
);
313 spin_lock(&dev
->done
.lock
);
314 __skb_queue_tail(&dev
->done
, skb
);
315 if (dev
->done
.qlen
== 1)
316 tasklet_schedule(&dev
->bh
);
317 spin_unlock_irqrestore(&dev
->done
.lock
, flags
);
321 /* some work can't be done in tasklets, so we use keventd
323 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
324 * but tasklet_schedule() doesn't. hope the failure is rare.
326 void usbnet_defer_kevent (struct usbnet
*dev
, int work
)
328 set_bit (work
, &dev
->flags
);
329 if (!schedule_work (&dev
->kevent
))
330 netdev_err(dev
->net
, "kevent %d may have been dropped\n", work
);
332 netdev_dbg(dev
->net
, "kevent %d scheduled\n", work
);
334 EXPORT_SYMBOL_GPL(usbnet_defer_kevent
);
336 /*-------------------------------------------------------------------------*/
338 static void rx_complete (struct urb
*urb
);
340 static int rx_submit (struct usbnet
*dev
, struct urb
*urb
, gfp_t flags
)
343 struct skb_data
*entry
;
345 unsigned long lockflags
;
346 size_t size
= dev
->rx_urb_size
;
348 skb
= __netdev_alloc_skb_ip_align(dev
->net
, size
, flags
);
350 netif_dbg(dev
, rx_err
, dev
->net
, "no rx skb\n");
351 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
356 entry
= (struct skb_data
*) skb
->cb
;
361 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->in
,
362 skb
->data
, size
, rx_complete
, skb
);
364 spin_lock_irqsave (&dev
->rxq
.lock
, lockflags
);
366 if (netif_running (dev
->net
) &&
367 netif_device_present (dev
->net
) &&
368 !test_bit (EVENT_RX_HALT
, &dev
->flags
) &&
369 !test_bit (EVENT_DEV_ASLEEP
, &dev
->flags
)) {
370 switch (retval
= usb_submit_urb (urb
, GFP_ATOMIC
)) {
372 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
375 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
378 netif_dbg(dev
, ifdown
, dev
->net
, "device gone\n");
379 netif_device_detach (dev
->net
);
385 netif_dbg(dev
, rx_err
, dev
->net
,
386 "rx submit, %d\n", retval
);
387 tasklet_schedule (&dev
->bh
);
390 __usbnet_queue_skb(&dev
->rxq
, skb
, rx_start
);
393 netif_dbg(dev
, ifdown
, dev
->net
, "rx: stopped\n");
396 spin_unlock_irqrestore (&dev
->rxq
.lock
, lockflags
);
398 dev_kfree_skb_any (skb
);
405 /*-------------------------------------------------------------------------*/
407 static inline void rx_process (struct usbnet
*dev
, struct sk_buff
*skb
)
409 if (dev
->driver_info
->rx_fixup
&&
410 !dev
->driver_info
->rx_fixup (dev
, skb
)) {
411 /* With RX_ASSEMBLE, rx_fixup() must update counters */
412 if (!(dev
->driver_info
->flags
& FLAG_RX_ASSEMBLE
))
413 dev
->net
->stats
.rx_errors
++;
416 // else network stack removes extra byte if we forced a short packet
419 /* all data was already cloned from skb inside the driver */
420 if (dev
->driver_info
->flags
& FLAG_MULTI_PACKET
)
421 dev_kfree_skb_any(skb
);
423 usbnet_skb_return(dev
, skb
);
427 netif_dbg(dev
, rx_err
, dev
->net
, "drop\n");
428 dev
->net
->stats
.rx_errors
++;
430 skb_queue_tail(&dev
->done
, skb
);
433 /*-------------------------------------------------------------------------*/
435 static void rx_complete (struct urb
*urb
)
437 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
438 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
439 struct usbnet
*dev
= entry
->dev
;
440 int urb_status
= urb
->status
;
441 enum skb_state state
;
443 skb_put (skb
, urb
->actual_length
);
447 switch (urb_status
) {
450 if (skb
->len
< dev
->net
->hard_header_len
) {
452 dev
->net
->stats
.rx_errors
++;
453 dev
->net
->stats
.rx_length_errors
++;
454 netif_dbg(dev
, rx_err
, dev
->net
,
455 "rx length %d\n", skb
->len
);
459 /* stalls need manual reset. this is rare ... except that
460 * when going through USB 2.0 TTs, unplug appears this way.
461 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
462 * storm, recovering as needed.
465 dev
->net
->stats
.rx_errors
++;
466 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
469 /* software-driven interface shutdown */
470 case -ECONNRESET
: /* async unlink */
471 case -ESHUTDOWN
: /* hardware gone */
472 netif_dbg(dev
, ifdown
, dev
->net
,
473 "rx shutdown, code %d\n", urb_status
);
476 /* we get controller i/o faults during khubd disconnect() delays.
477 * throttle down resubmits, to avoid log floods; just temporarily,
478 * so we still recover when the fault isn't a khubd delay.
483 dev
->net
->stats
.rx_errors
++;
484 if (!timer_pending (&dev
->delay
)) {
485 mod_timer (&dev
->delay
, jiffies
+ THROTTLE_JIFFIES
);
486 netif_dbg(dev
, link
, dev
->net
,
487 "rx throttle %d\n", urb_status
);
495 /* data overrun ... flush fifo? */
497 dev
->net
->stats
.rx_over_errors
++;
502 dev
->net
->stats
.rx_errors
++;
503 netif_dbg(dev
, rx_err
, dev
->net
, "rx status %d\n", urb_status
);
507 state
= defer_bh(dev
, skb
, &dev
->rxq
, state
);
510 if (netif_running (dev
->net
) &&
511 !test_bit (EVENT_RX_HALT
, &dev
->flags
) &&
512 state
!= unlink_start
) {
513 rx_submit (dev
, urb
, GFP_ATOMIC
);
514 usb_mark_last_busy(dev
->udev
);
519 netif_dbg(dev
, rx_err
, dev
->net
, "no read resubmitted\n");
522 static void intr_complete (struct urb
*urb
)
524 struct usbnet
*dev
= urb
->context
;
525 int status
= urb
->status
;
530 dev
->driver_info
->status(dev
, urb
);
533 /* software-driven interface shutdown */
534 case -ENOENT
: /* urb killed */
535 case -ESHUTDOWN
: /* hardware gone */
536 netif_dbg(dev
, ifdown
, dev
->net
,
537 "intr shutdown, code %d\n", status
);
540 /* NOTE: not throttling like RX/TX, since this endpoint
541 * already polls infrequently
544 netdev_dbg(dev
->net
, "intr status %d\n", status
);
548 if (!netif_running (dev
->net
))
551 memset(urb
->transfer_buffer
, 0, urb
->transfer_buffer_length
);
552 status
= usb_submit_urb (urb
, GFP_ATOMIC
);
554 netif_err(dev
, timer
, dev
->net
,
555 "intr resubmit --> %d\n", status
);
558 /*-------------------------------------------------------------------------*/
559 void usbnet_pause_rx(struct usbnet
*dev
)
561 set_bit(EVENT_RX_PAUSED
, &dev
->flags
);
563 netif_dbg(dev
, rx_status
, dev
->net
, "paused rx queue enabled\n");
565 EXPORT_SYMBOL_GPL(usbnet_pause_rx
);
567 void usbnet_resume_rx(struct usbnet
*dev
)
572 clear_bit(EVENT_RX_PAUSED
, &dev
->flags
);
574 while ((skb
= skb_dequeue(&dev
->rxq_pause
)) != NULL
) {
575 usbnet_skb_return(dev
, skb
);
579 tasklet_schedule(&dev
->bh
);
581 netif_dbg(dev
, rx_status
, dev
->net
,
582 "paused rx queue disabled, %d skbs requeued\n", num
);
584 EXPORT_SYMBOL_GPL(usbnet_resume_rx
);
586 void usbnet_purge_paused_rxq(struct usbnet
*dev
)
588 skb_queue_purge(&dev
->rxq_pause
);
590 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq
);
592 /*-------------------------------------------------------------------------*/
594 // unlink pending rx/tx; completion handlers do all other cleanup
596 static int unlink_urbs (struct usbnet
*dev
, struct sk_buff_head
*q
)
602 spin_lock_irqsave (&q
->lock
, flags
);
603 while (!skb_queue_empty(q
)) {
604 struct skb_data
*entry
;
608 skb_queue_walk(q
, skb
) {
609 entry
= (struct skb_data
*) skb
->cb
;
610 if (entry
->state
!= unlink_start
)
615 entry
->state
= unlink_start
;
619 * Get reference count of the URB to avoid it to be
620 * freed during usb_unlink_urb, which may trigger
621 * use-after-free problem inside usb_unlink_urb since
622 * usb_unlink_urb is always racing with .complete
623 * handler(include defer_bh).
626 spin_unlock_irqrestore(&q
->lock
, flags
);
627 // during some PM-driven resume scenarios,
628 // these (async) unlinks complete immediately
629 retval
= usb_unlink_urb (urb
);
630 if (retval
!= -EINPROGRESS
&& retval
!= 0)
631 netdev_dbg(dev
->net
, "unlink urb err, %d\n", retval
);
635 spin_lock_irqsave(&q
->lock
, flags
);
637 spin_unlock_irqrestore (&q
->lock
, flags
);
641 // Flush all pending rx urbs
642 // minidrivers may need to do this when the MTU changes
644 void usbnet_unlink_rx_urbs(struct usbnet
*dev
)
646 if (netif_running(dev
->net
)) {
647 (void) unlink_urbs (dev
, &dev
->rxq
);
648 tasklet_schedule(&dev
->bh
);
651 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs
);
653 /*-------------------------------------------------------------------------*/
655 // precondition: never called in_interrupt
656 static void usbnet_terminate_urbs(struct usbnet
*dev
)
658 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup
);
659 DECLARE_WAITQUEUE(wait
, current
);
662 /* ensure there are no more active urbs */
663 add_wait_queue(&unlink_wakeup
, &wait
);
664 set_current_state(TASK_UNINTERRUPTIBLE
);
665 dev
->wait
= &unlink_wakeup
;
666 temp
= unlink_urbs(dev
, &dev
->txq
) +
667 unlink_urbs(dev
, &dev
->rxq
);
669 /* maybe wait for deletions to finish. */
670 while (!skb_queue_empty(&dev
->rxq
)
671 && !skb_queue_empty(&dev
->txq
)
672 && !skb_queue_empty(&dev
->done
)) {
673 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS
));
674 set_current_state(TASK_UNINTERRUPTIBLE
);
675 netif_dbg(dev
, ifdown
, dev
->net
,
676 "waited for %d urb completions\n", temp
);
678 set_current_state(TASK_RUNNING
);
680 remove_wait_queue(&unlink_wakeup
, &wait
);
683 int usbnet_stop (struct net_device
*net
)
685 struct usbnet
*dev
= netdev_priv(net
);
686 struct driver_info
*info
= dev
->driver_info
;
689 clear_bit(EVENT_DEV_OPEN
, &dev
->flags
);
690 netif_stop_queue (net
);
692 netif_info(dev
, ifdown
, dev
->net
,
693 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
694 net
->stats
.rx_packets
, net
->stats
.tx_packets
,
695 net
->stats
.rx_errors
, net
->stats
.tx_errors
);
697 /* allow minidriver to stop correctly (wireless devices to turn off
700 retval
= info
->stop(dev
);
702 netif_info(dev
, ifdown
, dev
->net
,
703 "stop fail (%d) usbnet usb-%s-%s, %s\n",
705 dev
->udev
->bus
->bus_name
, dev
->udev
->devpath
,
709 if (!(info
->flags
& FLAG_AVOID_UNLINK_URBS
))
710 usbnet_terminate_urbs(dev
);
712 usb_kill_urb(dev
->interrupt
);
714 usbnet_purge_paused_rxq(dev
);
716 /* deferred work (task, timer, softirq) must also stop.
717 * can't flush_scheduled_work() until we drop rtnl (later),
718 * else workers could deadlock; so make workers a NOP.
721 del_timer_sync (&dev
->delay
);
722 tasklet_kill (&dev
->bh
);
723 if (info
->manage_power
)
724 info
->manage_power(dev
, 0);
726 usb_autopm_put_interface(dev
->intf
);
730 EXPORT_SYMBOL_GPL(usbnet_stop
);
732 /*-------------------------------------------------------------------------*/
734 // posts reads, and enables write queuing
736 // precondition: never called in_interrupt
738 int usbnet_open (struct net_device
*net
)
740 struct usbnet
*dev
= netdev_priv(net
);
742 struct driver_info
*info
= dev
->driver_info
;
744 if ((retval
= usb_autopm_get_interface(dev
->intf
)) < 0) {
745 netif_info(dev
, ifup
, dev
->net
,
746 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
748 dev
->udev
->bus
->bus_name
,
754 // put into "known safe" state
755 if (info
->reset
&& (retval
= info
->reset (dev
)) < 0) {
756 netif_info(dev
, ifup
, dev
->net
,
757 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
759 dev
->udev
->bus
->bus_name
,
765 // insist peer be connected
766 if (info
->check_connect
&& (retval
= info
->check_connect (dev
)) < 0) {
767 netif_dbg(dev
, ifup
, dev
->net
, "can't open; %d\n", retval
);
771 /* start any status interrupt transfer */
772 if (dev
->interrupt
) {
773 retval
= usb_submit_urb (dev
->interrupt
, GFP_KERNEL
);
775 netif_err(dev
, ifup
, dev
->net
,
776 "intr submit %d\n", retval
);
781 set_bit(EVENT_DEV_OPEN
, &dev
->flags
);
782 netif_start_queue (net
);
783 netif_info(dev
, ifup
, dev
->net
,
784 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
785 (int)RX_QLEN(dev
), (int)TX_QLEN(dev
),
787 (dev
->driver_info
->flags
& FLAG_FRAMING_NC
) ? "NetChip" :
788 (dev
->driver_info
->flags
& FLAG_FRAMING_GL
) ? "GeneSys" :
789 (dev
->driver_info
->flags
& FLAG_FRAMING_Z
) ? "Zaurus" :
790 (dev
->driver_info
->flags
& FLAG_FRAMING_RN
) ? "RNDIS" :
791 (dev
->driver_info
->flags
& FLAG_FRAMING_AX
) ? "ASIX" :
794 // delay posting reads until we're fully open
795 tasklet_schedule (&dev
->bh
);
796 if (info
->manage_power
) {
797 retval
= info
->manage_power(dev
, 1);
800 usb_autopm_put_interface(dev
->intf
);
805 usb_autopm_put_interface(dev
->intf
);
809 EXPORT_SYMBOL_GPL(usbnet_open
);
811 /*-------------------------------------------------------------------------*/
813 /* ethtool methods; minidrivers may need to add some more, but
814 * they'll probably want to use this base set.
817 int usbnet_get_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
819 struct usbnet
*dev
= netdev_priv(net
);
821 if (!dev
->mii
.mdio_read
)
824 return mii_ethtool_gset(&dev
->mii
, cmd
);
826 EXPORT_SYMBOL_GPL(usbnet_get_settings
);
828 int usbnet_set_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
830 struct usbnet
*dev
= netdev_priv(net
);
833 if (!dev
->mii
.mdio_write
)
836 retval
= mii_ethtool_sset(&dev
->mii
, cmd
);
838 /* link speed/duplex might have changed */
839 if (dev
->driver_info
->link_reset
)
840 dev
->driver_info
->link_reset(dev
);
845 EXPORT_SYMBOL_GPL(usbnet_set_settings
);
847 u32
usbnet_get_link (struct net_device
*net
)
849 struct usbnet
*dev
= netdev_priv(net
);
851 /* If a check_connect is defined, return its result */
852 if (dev
->driver_info
->check_connect
)
853 return dev
->driver_info
->check_connect (dev
) == 0;
855 /* if the device has mii operations, use those */
856 if (dev
->mii
.mdio_read
)
857 return mii_link_ok(&dev
->mii
);
859 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
860 return ethtool_op_get_link(net
);
862 EXPORT_SYMBOL_GPL(usbnet_get_link
);
864 int usbnet_nway_reset(struct net_device
*net
)
866 struct usbnet
*dev
= netdev_priv(net
);
868 if (!dev
->mii
.mdio_write
)
871 return mii_nway_restart(&dev
->mii
);
873 EXPORT_SYMBOL_GPL(usbnet_nway_reset
);
875 void usbnet_get_drvinfo (struct net_device
*net
, struct ethtool_drvinfo
*info
)
877 struct usbnet
*dev
= netdev_priv(net
);
879 strncpy (info
->driver
, dev
->driver_name
, sizeof info
->driver
);
880 strncpy (info
->version
, DRIVER_VERSION
, sizeof info
->version
);
881 strncpy (info
->fw_version
, dev
->driver_info
->description
,
882 sizeof info
->fw_version
);
883 usb_make_path (dev
->udev
, info
->bus_info
, sizeof info
->bus_info
);
885 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo
);
887 u32
usbnet_get_msglevel (struct net_device
*net
)
889 struct usbnet
*dev
= netdev_priv(net
);
891 return dev
->msg_enable
;
893 EXPORT_SYMBOL_GPL(usbnet_get_msglevel
);
895 void usbnet_set_msglevel (struct net_device
*net
, u32 level
)
897 struct usbnet
*dev
= netdev_priv(net
);
899 dev
->msg_enable
= level
;
901 EXPORT_SYMBOL_GPL(usbnet_set_msglevel
);
903 /* drivers may override default ethtool_ops in their bind() routine */
904 static const struct ethtool_ops usbnet_ethtool_ops
= {
905 .get_settings
= usbnet_get_settings
,
906 .set_settings
= usbnet_set_settings
,
907 .get_link
= usbnet_get_link
,
908 .nway_reset
= usbnet_nway_reset
,
909 .get_drvinfo
= usbnet_get_drvinfo
,
910 .get_msglevel
= usbnet_get_msglevel
,
911 .set_msglevel
= usbnet_set_msglevel
,
912 .get_ts_info
= ethtool_op_get_ts_info
,
915 /*-------------------------------------------------------------------------*/
917 /* work that cannot be done in interrupt context uses keventd.
919 * NOTE: with 2.5 we could do more of this using completion callbacks,
920 * especially now that control transfers can be queued.
923 kevent (struct work_struct
*work
)
926 container_of(work
, struct usbnet
, kevent
);
929 /* usb_clear_halt() needs a thread context */
930 if (test_bit (EVENT_TX_HALT
, &dev
->flags
)) {
931 unlink_urbs (dev
, &dev
->txq
);
932 status
= usb_autopm_get_interface(dev
->intf
);
935 status
= usb_clear_halt (dev
->udev
, dev
->out
);
936 usb_autopm_put_interface(dev
->intf
);
939 status
!= -ESHUTDOWN
) {
940 if (netif_msg_tx_err (dev
))
942 netdev_err(dev
->net
, "can't clear tx halt, status %d\n",
945 clear_bit (EVENT_TX_HALT
, &dev
->flags
);
946 if (status
!= -ESHUTDOWN
)
947 netif_wake_queue (dev
->net
);
950 if (test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
951 unlink_urbs (dev
, &dev
->rxq
);
952 status
= usb_autopm_get_interface(dev
->intf
);
955 status
= usb_clear_halt (dev
->udev
, dev
->in
);
956 usb_autopm_put_interface(dev
->intf
);
959 status
!= -ESHUTDOWN
) {
960 if (netif_msg_rx_err (dev
))
962 netdev_err(dev
->net
, "can't clear rx halt, status %d\n",
965 clear_bit (EVENT_RX_HALT
, &dev
->flags
);
966 tasklet_schedule (&dev
->bh
);
970 /* tasklet could resubmit itself forever if memory is tight */
971 if (test_bit (EVENT_RX_MEMORY
, &dev
->flags
)) {
972 struct urb
*urb
= NULL
;
975 if (netif_running (dev
->net
))
976 urb
= usb_alloc_urb (0, GFP_KERNEL
);
978 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
980 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
981 status
= usb_autopm_get_interface(dev
->intf
);
986 if (rx_submit (dev
, urb
, GFP_KERNEL
) == -ENOLINK
)
988 usb_autopm_put_interface(dev
->intf
);
991 tasklet_schedule (&dev
->bh
);
995 if (test_bit (EVENT_LINK_RESET
, &dev
->flags
)) {
996 struct driver_info
*info
= dev
->driver_info
;
999 clear_bit (EVENT_LINK_RESET
, &dev
->flags
);
1000 status
= usb_autopm_get_interface(dev
->intf
);
1003 if(info
->link_reset
&& (retval
= info
->link_reset(dev
)) < 0) {
1004 usb_autopm_put_interface(dev
->intf
);
1006 netdev_info(dev
->net
, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1008 dev
->udev
->bus
->bus_name
,
1012 usb_autopm_put_interface(dev
->intf
);
1017 netdev_dbg(dev
->net
, "kevent done, flags = 0x%lx\n", dev
->flags
);
1020 /*-------------------------------------------------------------------------*/
1022 static void tx_complete (struct urb
*urb
)
1024 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
1025 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
1026 struct usbnet
*dev
= entry
->dev
;
1028 if (urb
->status
== 0) {
1029 if (!(dev
->driver_info
->flags
& FLAG_MULTI_PACKET
))
1030 dev
->net
->stats
.tx_packets
++;
1031 dev
->net
->stats
.tx_bytes
+= entry
->length
;
1033 dev
->net
->stats
.tx_errors
++;
1035 switch (urb
->status
) {
1037 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
1040 /* software-driven interface shutdown */
1041 case -ECONNRESET
: // async unlink
1042 case -ESHUTDOWN
: // hardware gone
1045 // like rx, tx gets controller i/o faults during khubd delays
1046 // and so it uses the same throttling mechanism.
1050 usb_mark_last_busy(dev
->udev
);
1051 if (!timer_pending (&dev
->delay
)) {
1052 mod_timer (&dev
->delay
,
1053 jiffies
+ THROTTLE_JIFFIES
);
1054 netif_dbg(dev
, link
, dev
->net
,
1055 "tx throttle %d\n", urb
->status
);
1057 netif_stop_queue (dev
->net
);
1060 netif_dbg(dev
, tx_err
, dev
->net
,
1061 "tx err %d\n", entry
->urb
->status
);
1066 usb_autopm_put_interface_async(dev
->intf
);
1067 (void) defer_bh(dev
, skb
, &dev
->txq
, tx_done
);
1070 /*-------------------------------------------------------------------------*/
1072 void usbnet_tx_timeout (struct net_device
*net
)
1074 struct usbnet
*dev
= netdev_priv(net
);
1076 unlink_urbs (dev
, &dev
->txq
);
1077 tasklet_schedule (&dev
->bh
);
1079 // FIXME: device recovery -- reset?
1081 EXPORT_SYMBOL_GPL(usbnet_tx_timeout
);
1083 /*-------------------------------------------------------------------------*/
1085 netdev_tx_t
usbnet_start_xmit (struct sk_buff
*skb
,
1086 struct net_device
*net
)
1088 struct usbnet
*dev
= netdev_priv(net
);
1090 struct urb
*urb
= NULL
;
1091 struct skb_data
*entry
;
1092 struct driver_info
*info
= dev
->driver_info
;
1093 unsigned long flags
;
1097 skb_tx_timestamp(skb
);
1099 // some devices want funky USB-level framing, for
1100 // win32 driver (usually) and/or hardware quirks
1101 if (info
->tx_fixup
) {
1102 skb
= info
->tx_fixup (dev
, skb
, GFP_ATOMIC
);
1104 if (netif_msg_tx_err(dev
)) {
1105 netif_dbg(dev
, tx_err
, dev
->net
, "can't tx_fixup skb\n");
1108 /* cdc_ncm collected packet; waits for more */
1115 if (!(urb
= usb_alloc_urb (0, GFP_ATOMIC
))) {
1116 netif_dbg(dev
, tx_err
, dev
->net
, "no urb\n");
1120 entry
= (struct skb_data
*) skb
->cb
;
1123 entry
->length
= length
;
1125 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->out
,
1126 skb
->data
, skb
->len
, tx_complete
, skb
);
1128 /* don't assume the hardware handles USB_ZERO_PACKET
1129 * NOTE: strictly conforming cdc-ether devices should expect
1130 * the ZLP here, but ignore the one-byte packet.
1131 * NOTE2: CDC NCM specification is different from CDC ECM when
1132 * handling ZLP/short packets, so cdc_ncm driver will make short
1133 * packet itself if needed.
1135 if (length
% dev
->maxpacket
== 0) {
1136 if (!(info
->flags
& FLAG_SEND_ZLP
)) {
1137 if (!(info
->flags
& FLAG_MULTI_PACKET
)) {
1138 urb
->transfer_buffer_length
++;
1139 if (skb_tailroom(skb
)) {
1140 skb
->data
[skb
->len
] = 0;
1145 urb
->transfer_flags
|= URB_ZERO_PACKET
;
1148 spin_lock_irqsave(&dev
->txq
.lock
, flags
);
1149 retval
= usb_autopm_get_interface_async(dev
->intf
);
1151 spin_unlock_irqrestore(&dev
->txq
.lock
, flags
);
1156 /* if this triggers the device is still a sleep */
1157 if (test_bit(EVENT_DEV_ASLEEP
, &dev
->flags
)) {
1158 /* transmission will be done in resume */
1159 usb_anchor_urb(urb
, &dev
->deferred
);
1160 /* no use to process more packets */
1161 netif_stop_queue(net
);
1162 spin_unlock_irqrestore(&dev
->txq
.lock
, flags
);
1163 netdev_dbg(dev
->net
, "Delaying transmission for resumption\n");
1168 switch ((retval
= usb_submit_urb (urb
, GFP_ATOMIC
))) {
1170 netif_stop_queue (net
);
1171 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
1172 usb_autopm_put_interface_async(dev
->intf
);
1175 usb_autopm_put_interface_async(dev
->intf
);
1176 netif_dbg(dev
, tx_err
, dev
->net
,
1177 "tx: submit urb err %d\n", retval
);
1180 net
->trans_start
= jiffies
;
1181 __usbnet_queue_skb(&dev
->txq
, skb
, tx_start
);
1182 if (dev
->txq
.qlen
>= TX_QLEN (dev
))
1183 netif_stop_queue (net
);
1185 spin_unlock_irqrestore (&dev
->txq
.lock
, flags
);
1188 netif_dbg(dev
, tx_err
, dev
->net
, "drop, code %d\n", retval
);
1190 dev
->net
->stats
.tx_dropped
++;
1193 dev_kfree_skb_any (skb
);
1196 netif_dbg(dev
, tx_queued
, dev
->net
,
1197 "> tx, len %d, type 0x%x\n", length
, skb
->protocol
);
1201 return NETDEV_TX_OK
;
1203 EXPORT_SYMBOL_GPL(usbnet_start_xmit
);
1205 /*-------------------------------------------------------------------------*/
1207 // tasklet (work deferred from completions, in_irq) or timer
1209 static void usbnet_bh (unsigned long param
)
1211 struct usbnet
*dev
= (struct usbnet
*) param
;
1212 struct sk_buff
*skb
;
1213 struct skb_data
*entry
;
1215 while ((skb
= skb_dequeue (&dev
->done
))) {
1216 entry
= (struct skb_data
*) skb
->cb
;
1217 switch (entry
->state
) {
1219 entry
->state
= rx_cleanup
;
1220 rx_process (dev
, skb
);
1224 usb_free_urb (entry
->urb
);
1225 dev_kfree_skb (skb
);
1228 netdev_dbg(dev
->net
, "bogus skb state %d\n", entry
->state
);
1232 // waiting for all pending urbs to complete?
1234 if ((dev
->txq
.qlen
+ dev
->rxq
.qlen
+ dev
->done
.qlen
) == 0) {
1235 wake_up (dev
->wait
);
1238 // or are we maybe short a few urbs?
1239 } else if (netif_running (dev
->net
) &&
1240 netif_device_present (dev
->net
) &&
1241 !timer_pending (&dev
->delay
) &&
1242 !test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
1243 int temp
= dev
->rxq
.qlen
;
1244 int qlen
= RX_QLEN (dev
);
1250 // don't refill the queue all at once
1251 for (i
= 0; i
< 10 && dev
->rxq
.qlen
< qlen
; i
++) {
1252 urb
= usb_alloc_urb (0, GFP_ATOMIC
);
1254 if (rx_submit (dev
, urb
, GFP_ATOMIC
) ==
1259 if (temp
!= dev
->rxq
.qlen
)
1260 netif_dbg(dev
, link
, dev
->net
,
1261 "rxqlen %d --> %d\n",
1262 temp
, dev
->rxq
.qlen
);
1263 if (dev
->rxq
.qlen
< qlen
)
1264 tasklet_schedule (&dev
->bh
);
1266 if (dev
->txq
.qlen
< TX_QLEN (dev
))
1267 netif_wake_queue (dev
->net
);
1272 /*-------------------------------------------------------------------------
1274 * USB Device Driver support
1276 *-------------------------------------------------------------------------*/
1278 // precondition: never called in_interrupt
1280 void usbnet_disconnect (struct usb_interface
*intf
)
1283 struct usb_device
*xdev
;
1284 struct net_device
*net
;
1286 dev
= usb_get_intfdata(intf
);
1287 usb_set_intfdata(intf
, NULL
);
1291 xdev
= interface_to_usbdev (intf
);
1293 netif_info(dev
, probe
, dev
->net
, "unregister '%s' usb-%s-%s, %s\n",
1294 intf
->dev
.driver
->name
,
1295 xdev
->bus
->bus_name
, xdev
->devpath
,
1296 dev
->driver_info
->description
);
1299 unregister_netdev (net
);
1301 cancel_work_sync(&dev
->kevent
);
1303 if (dev
->driver_info
->unbind
)
1304 dev
->driver_info
->unbind (dev
, intf
);
1306 usb_kill_urb(dev
->interrupt
);
1307 usb_free_urb(dev
->interrupt
);
1312 EXPORT_SYMBOL_GPL(usbnet_disconnect
);
1314 static const struct net_device_ops usbnet_netdev_ops
= {
1315 .ndo_open
= usbnet_open
,
1316 .ndo_stop
= usbnet_stop
,
1317 .ndo_start_xmit
= usbnet_start_xmit
,
1318 .ndo_tx_timeout
= usbnet_tx_timeout
,
1319 .ndo_change_mtu
= usbnet_change_mtu
,
1320 .ndo_set_mac_address
= eth_mac_addr
,
1321 .ndo_validate_addr
= eth_validate_addr
,
1324 /*-------------------------------------------------------------------------*/
1326 // precondition: never called in_interrupt
1328 static struct device_type wlan_type
= {
1332 static struct device_type wwan_type
= {
1337 usbnet_probe (struct usb_interface
*udev
, const struct usb_device_id
*prod
)
1340 struct net_device
*net
;
1341 struct usb_host_interface
*interface
;
1342 struct driver_info
*info
;
1343 struct usb_device
*xdev
;
1346 struct usb_driver
*driver
= to_usb_driver(udev
->dev
.driver
);
1348 /* usbnet already took usb runtime pm, so have to enable the feature
1349 * for usb interface, otherwise usb_autopm_get_interface may return
1350 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1352 if (!driver
->supports_autosuspend
) {
1353 driver
->supports_autosuspend
= 1;
1354 pm_runtime_enable(&udev
->dev
);
1357 name
= udev
->dev
.driver
->name
;
1358 info
= (struct driver_info
*) prod
->driver_info
;
1360 dev_dbg (&udev
->dev
, "blacklisted by %s\n", name
);
1363 xdev
= interface_to_usbdev (udev
);
1364 interface
= udev
->cur_altsetting
;
1370 // set up our own records
1371 net
= alloc_etherdev(sizeof(*dev
));
1375 /* netdev_printk() needs this so do it as early as possible */
1376 SET_NETDEV_DEV(net
, &udev
->dev
);
1378 dev
= netdev_priv(net
);
1381 dev
->driver_info
= info
;
1382 dev
->driver_name
= name
;
1383 dev
->msg_enable
= netif_msg_init (msg_level
, NETIF_MSG_DRV
1384 | NETIF_MSG_PROBE
| NETIF_MSG_LINK
);
1385 skb_queue_head_init (&dev
->rxq
);
1386 skb_queue_head_init (&dev
->txq
);
1387 skb_queue_head_init (&dev
->done
);
1388 skb_queue_head_init(&dev
->rxq_pause
);
1389 dev
->bh
.func
= usbnet_bh
;
1390 dev
->bh
.data
= (unsigned long) dev
;
1391 INIT_WORK (&dev
->kevent
, kevent
);
1392 init_usb_anchor(&dev
->deferred
);
1393 dev
->delay
.function
= usbnet_bh
;
1394 dev
->delay
.data
= (unsigned long) dev
;
1395 init_timer (&dev
->delay
);
1396 mutex_init (&dev
->phy_mutex
);
1399 strcpy (net
->name
, "usb%d");
1400 memcpy (net
->dev_addr
, node_id
, sizeof node_id
);
1402 /* rx and tx sides can use different message sizes;
1403 * bind() should set rx_urb_size in that case.
1405 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
1407 // dma_supported() is deeply broken on almost all architectures
1408 // possible with some EHCI controllers
1409 if (dma_supported (&udev
->dev
, DMA_BIT_MASK(64)))
1410 net
->features
|= NETIF_F_HIGHDMA
;
1413 net
->netdev_ops
= &usbnet_netdev_ops
;
1414 net
->watchdog_timeo
= TX_TIMEOUT_JIFFIES
;
1415 net
->ethtool_ops
= &usbnet_ethtool_ops
;
1417 // allow device-specific bind/init procedures
1418 // NOTE net->name still not usable ...
1420 status
= info
->bind (dev
, udev
);
1424 // heuristic: "usb%d" for links we know are two-host,
1425 // else "eth%d" when there's reasonable doubt. userspace
1426 // can rename the link if it knows better.
1427 if ((dev
->driver_info
->flags
& FLAG_ETHER
) != 0 &&
1428 ((dev
->driver_info
->flags
& FLAG_POINTTOPOINT
) == 0 ||
1429 (net
->dev_addr
[0] & 0x02) == 0))
1430 strcpy (net
->name
, "eth%d");
1431 /* WLAN devices should always be named "wlan%d" */
1432 if ((dev
->driver_info
->flags
& FLAG_WLAN
) != 0)
1433 strcpy(net
->name
, "wlan%d");
1434 /* WWAN devices should always be named "wwan%d" */
1435 if ((dev
->driver_info
->flags
& FLAG_WWAN
) != 0)
1436 strcpy(net
->name
, "wwan%d");
1438 /* maybe the remote can't receive an Ethernet MTU */
1439 if (net
->mtu
> (dev
->hard_mtu
- net
->hard_header_len
))
1440 net
->mtu
= dev
->hard_mtu
- net
->hard_header_len
;
1441 } else if (!info
->in
|| !info
->out
)
1442 status
= usbnet_get_endpoints (dev
, udev
);
1444 dev
->in
= usb_rcvbulkpipe (xdev
, info
->in
);
1445 dev
->out
= usb_sndbulkpipe (xdev
, info
->out
);
1446 if (!(info
->flags
& FLAG_NO_SETINT
))
1447 status
= usb_set_interface (xdev
,
1448 interface
->desc
.bInterfaceNumber
,
1449 interface
->desc
.bAlternateSetting
);
1454 if (status
>= 0 && dev
->status
)
1455 status
= init_status (dev
, udev
);
1459 if (!dev
->rx_urb_size
)
1460 dev
->rx_urb_size
= dev
->hard_mtu
;
1461 dev
->maxpacket
= usb_maxpacket (dev
->udev
, dev
->out
, 1);
1463 if ((dev
->driver_info
->flags
& FLAG_WLAN
) != 0)
1464 SET_NETDEV_DEVTYPE(net
, &wlan_type
);
1465 if ((dev
->driver_info
->flags
& FLAG_WWAN
) != 0)
1466 SET_NETDEV_DEVTYPE(net
, &wwan_type
);
1468 status
= register_netdev (net
);
1471 netif_info(dev
, probe
, dev
->net
,
1472 "register '%s' at usb-%s-%s, %s, %pM\n",
1473 udev
->dev
.driver
->name
,
1474 xdev
->bus
->bus_name
, xdev
->devpath
,
1475 dev
->driver_info
->description
,
1478 // ok, it's ready to go.
1479 usb_set_intfdata (udev
, dev
);
1481 netif_device_attach (net
);
1483 if (dev
->driver_info
->flags
& FLAG_LINK_INTR
)
1484 netif_carrier_off(net
);
1489 usb_free_urb(dev
->interrupt
);
1492 info
->unbind (dev
, udev
);
1499 EXPORT_SYMBOL_GPL(usbnet_probe
);
1501 /*-------------------------------------------------------------------------*/
1504 * suspend the whole driver as soon as the first interface is suspended
1505 * resume only when the last interface is resumed
1508 int usbnet_suspend (struct usb_interface
*intf
, pm_message_t message
)
1510 struct usbnet
*dev
= usb_get_intfdata(intf
);
1512 if (!dev
->suspend_count
++) {
1513 spin_lock_irq(&dev
->txq
.lock
);
1514 /* don't autosuspend while transmitting */
1515 if (dev
->txq
.qlen
&& PMSG_IS_AUTO(message
)) {
1516 spin_unlock_irq(&dev
->txq
.lock
);
1519 set_bit(EVENT_DEV_ASLEEP
, &dev
->flags
);
1520 spin_unlock_irq(&dev
->txq
.lock
);
1523 * accelerate emptying of the rx and queues, to avoid
1524 * having everything error out.
1526 netif_device_detach (dev
->net
);
1527 usbnet_terminate_urbs(dev
);
1528 usb_kill_urb(dev
->interrupt
);
1531 * reattach so runtime management can use and
1534 netif_device_attach (dev
->net
);
1538 EXPORT_SYMBOL_GPL(usbnet_suspend
);
1540 int usbnet_resume (struct usb_interface
*intf
)
1542 struct usbnet
*dev
= usb_get_intfdata(intf
);
1543 struct sk_buff
*skb
;
1547 if (!--dev
->suspend_count
) {
1548 /* resume interrupt URBs */
1549 if (dev
->interrupt
&& test_bit(EVENT_DEV_OPEN
, &dev
->flags
))
1550 usb_submit_urb(dev
->interrupt
, GFP_NOIO
);
1552 spin_lock_irq(&dev
->txq
.lock
);
1553 while ((res
= usb_get_from_anchor(&dev
->deferred
))) {
1555 skb
= (struct sk_buff
*)res
->context
;
1556 retval
= usb_submit_urb(res
, GFP_ATOMIC
);
1558 dev_kfree_skb_any(skb
);
1560 usb_autopm_put_interface_async(dev
->intf
);
1562 dev
->net
->trans_start
= jiffies
;
1563 __skb_queue_tail(&dev
->txq
, skb
);
1568 clear_bit(EVENT_DEV_ASLEEP
, &dev
->flags
);
1569 spin_unlock_irq(&dev
->txq
.lock
);
1571 if (test_bit(EVENT_DEV_OPEN
, &dev
->flags
)) {
1572 if (!(dev
->txq
.qlen
>= TX_QLEN(dev
)))
1573 netif_tx_wake_all_queues(dev
->net
);
1574 tasklet_schedule (&dev
->bh
);
1579 EXPORT_SYMBOL_GPL(usbnet_resume
);
1582 /*-------------------------------------------------------------------------*/
1584 static int __init
usbnet_init(void)
1586 /* Compiler should optimize this out. */
1588 FIELD_SIZEOF(struct sk_buff
, cb
) < sizeof(struct skb_data
));
1590 random_ether_addr(node_id
);
1593 module_init(usbnet_init
);
1595 static void __exit
usbnet_exit(void)
1598 module_exit(usbnet_exit
);
1600 MODULE_AUTHOR("David Brownell");
1601 MODULE_DESCRIPTION("USB network driver framework");
1602 MODULE_LICENSE("GPL");