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>
47 #define DRIVER_VERSION "22-Aug-2005"
50 /*-------------------------------------------------------------------------*/
53 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
54 * Several dozen bytes of IPv4 data can fit in two such transactions.
55 * One maximum size Ethernet packet takes twenty four of them.
56 * For high speed, each frame comfortably fits almost 36 max size
57 * Ethernet packets (so queues should be bigger).
59 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
60 * let the USB host controller be busy for 5msec or more before an irq
61 * is required, under load. Jumbograms change the equation.
63 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
64 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
65 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
66 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
67 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
69 // reawaken network queue this soon after stopping; else watchdog barks
70 #define TX_TIMEOUT_JIFFIES (5*HZ)
72 // throttle rx/tx briefly after some faults, so khubd might disconnect()
73 // us (it polls at HZ/4 usually) before we report too many false errors.
74 #define THROTTLE_JIFFIES (HZ/8)
77 #define UNLINK_TIMEOUT_MS 3
79 /*-------------------------------------------------------------------------*/
81 // randomly generated ethernet address
82 static u8 node_id
[ETH_ALEN
];
84 static const char driver_name
[] = "usbnet";
86 /* use ethtool to change the level for any given device */
87 static int msg_level
= -1;
88 module_param (msg_level
, int, 0);
89 MODULE_PARM_DESC (msg_level
, "Override default message level");
91 /*-------------------------------------------------------------------------*/
93 /* handles CDC Ethernet and many other network "bulk data" interfaces */
94 int usbnet_get_endpoints(struct usbnet
*dev
, struct usb_interface
*intf
)
97 struct usb_host_interface
*alt
= NULL
;
98 struct usb_host_endpoint
*in
= NULL
, *out
= NULL
;
99 struct usb_host_endpoint
*status
= NULL
;
101 for (tmp
= 0; tmp
< intf
->num_altsetting
; tmp
++) {
104 in
= out
= status
= NULL
;
105 alt
= intf
->altsetting
+ tmp
;
107 /* take the first altsetting with in-bulk + out-bulk;
108 * remember any status endpoint, just in case;
109 * ignore other endpoints and altsetttings.
111 for (ep
= 0; ep
< alt
->desc
.bNumEndpoints
; ep
++) {
112 struct usb_host_endpoint
*e
;
115 e
= alt
->endpoint
+ ep
;
116 switch (e
->desc
.bmAttributes
) {
117 case USB_ENDPOINT_XFER_INT
:
118 if (!usb_endpoint_dir_in(&e
->desc
))
122 case USB_ENDPOINT_XFER_BULK
:
127 if (usb_endpoint_dir_in(&e
->desc
)) {
130 else if (intr
&& !status
)
140 if (!alt
|| !in
|| !out
)
143 if (alt
->desc
.bAlternateSetting
!= 0 ||
144 !(dev
->driver_info
->flags
& FLAG_NO_SETINT
)) {
145 tmp
= usb_set_interface (dev
->udev
, alt
->desc
.bInterfaceNumber
,
146 alt
->desc
.bAlternateSetting
);
151 dev
->in
= usb_rcvbulkpipe (dev
->udev
,
152 in
->desc
.bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
153 dev
->out
= usb_sndbulkpipe (dev
->udev
,
154 out
->desc
.bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
155 dev
->status
= status
;
158 EXPORT_SYMBOL_GPL(usbnet_get_endpoints
);
160 static u8
nibble(unsigned char c
)
162 if (likely(isdigit(c
)))
165 if (likely(isxdigit(c
)))
170 int usbnet_get_ethernet_addr(struct usbnet
*dev
, int iMACAddress
)
173 unsigned char buf
[13];
175 tmp
= usb_string(dev
->udev
, iMACAddress
, buf
, sizeof buf
);
177 dev_dbg(&dev
->udev
->dev
,
178 "bad MAC string %d fetch, %d\n", iMACAddress
, tmp
);
183 for (i
= tmp
= 0; i
< 6; i
++, tmp
+= 2)
184 dev
->net
->dev_addr
[i
] =
185 (nibble(buf
[tmp
]) << 4) + nibble(buf
[tmp
+ 1]);
188 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr
);
190 static void intr_complete (struct urb
*urb
);
192 static int init_status (struct usbnet
*dev
, struct usb_interface
*intf
)
199 if (!dev
->driver_info
->status
)
202 pipe
= usb_rcvintpipe (dev
->udev
,
203 dev
->status
->desc
.bEndpointAddress
204 & USB_ENDPOINT_NUMBER_MASK
);
205 maxp
= usb_maxpacket (dev
->udev
, pipe
, 0);
207 /* avoid 1 msec chatter: min 8 msec poll rate */
208 period
= max ((int) dev
->status
->desc
.bInterval
,
209 (dev
->udev
->speed
== USB_SPEED_HIGH
) ? 7 : 3);
211 buf
= kmalloc (maxp
, GFP_KERNEL
);
213 dev
->interrupt
= usb_alloc_urb (0, GFP_KERNEL
);
214 if (!dev
->interrupt
) {
218 usb_fill_int_urb(dev
->interrupt
, dev
->udev
, pipe
,
219 buf
, maxp
, intr_complete
, dev
, period
);
221 "status ep%din, %d bytes period %d\n",
222 usb_pipeendpoint(pipe
), maxp
, period
);
228 /* Passes this packet up the stack, updating its accounting.
229 * Some link protocols batch packets, so their rx_fixup paths
230 * can return clones as well as just modify the original skb.
232 void usbnet_skb_return (struct usbnet
*dev
, struct sk_buff
*skb
)
236 if (test_bit(EVENT_RX_PAUSED
, &dev
->flags
)) {
237 skb_queue_tail(&dev
->rxq_pause
, skb
);
241 skb
->protocol
= eth_type_trans (skb
, dev
->net
);
242 dev
->net
->stats
.rx_packets
++;
243 dev
->net
->stats
.rx_bytes
+= skb
->len
;
245 netif_dbg(dev
, rx_status
, dev
->net
, "< rx, len %zu, type 0x%x\n",
246 skb
->len
+ sizeof (struct ethhdr
), skb
->protocol
);
247 memset (skb
->cb
, 0, sizeof (struct skb_data
));
248 status
= netif_rx (skb
);
249 if (status
!= NET_RX_SUCCESS
)
250 netif_dbg(dev
, rx_err
, dev
->net
,
251 "netif_rx status %d\n", status
);
253 EXPORT_SYMBOL_GPL(usbnet_skb_return
);
256 /*-------------------------------------------------------------------------
258 * Network Device Driver (peer link to "Host Device", from USB host)
260 *-------------------------------------------------------------------------*/
262 int usbnet_change_mtu (struct net_device
*net
, int new_mtu
)
264 struct usbnet
*dev
= netdev_priv(net
);
265 int ll_mtu
= new_mtu
+ net
->hard_header_len
;
266 int old_hard_mtu
= dev
->hard_mtu
;
267 int old_rx_urb_size
= dev
->rx_urb_size
;
271 // no second zero-length packet read wanted after mtu-sized packets
272 if ((ll_mtu
% dev
->maxpacket
) == 0)
276 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
277 if (dev
->rx_urb_size
== old_hard_mtu
) {
278 dev
->rx_urb_size
= dev
->hard_mtu
;
279 if (dev
->rx_urb_size
> old_rx_urb_size
)
280 usbnet_unlink_rx_urbs(dev
);
285 EXPORT_SYMBOL_GPL(usbnet_change_mtu
);
287 /*-------------------------------------------------------------------------*/
289 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
290 * completion callbacks. 2.5 should have fixed those bugs...
293 static void defer_bh(struct usbnet
*dev
, struct sk_buff
*skb
, struct sk_buff_head
*list
)
297 spin_lock_irqsave(&list
->lock
, flags
);
298 __skb_unlink(skb
, list
);
299 spin_unlock(&list
->lock
);
300 spin_lock(&dev
->done
.lock
);
301 __skb_queue_tail(&dev
->done
, skb
);
302 if (dev
->done
.qlen
== 1)
303 tasklet_schedule(&dev
->bh
);
304 spin_unlock_irqrestore(&dev
->done
.lock
, flags
);
307 /* some work can't be done in tasklets, so we use keventd
309 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
310 * but tasklet_schedule() doesn't. hope the failure is rare.
312 void usbnet_defer_kevent (struct usbnet
*dev
, int work
)
314 set_bit (work
, &dev
->flags
);
315 if (!schedule_work (&dev
->kevent
))
316 netdev_err(dev
->net
, "kevent %d may have been dropped\n", work
);
318 netdev_dbg(dev
->net
, "kevent %d scheduled\n", work
);
320 EXPORT_SYMBOL_GPL(usbnet_defer_kevent
);
322 /*-------------------------------------------------------------------------*/
324 static void rx_complete (struct urb
*urb
);
326 static void rx_submit (struct usbnet
*dev
, struct urb
*urb
, gfp_t flags
)
329 struct skb_data
*entry
;
331 unsigned long lockflags
;
332 size_t size
= dev
->rx_urb_size
;
334 if ((skb
= alloc_skb (size
+ NET_IP_ALIGN
, flags
)) == NULL
) {
335 netif_dbg(dev
, rx_err
, dev
->net
, "no rx skb\n");
336 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
340 skb_reserve (skb
, NET_IP_ALIGN
);
342 entry
= (struct skb_data
*) skb
->cb
;
345 entry
->state
= rx_start
;
348 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->in
,
349 skb
->data
, size
, rx_complete
, skb
);
351 spin_lock_irqsave (&dev
->rxq
.lock
, lockflags
);
353 if (netif_running (dev
->net
) &&
354 netif_device_present (dev
->net
) &&
355 !test_bit (EVENT_RX_HALT
, &dev
->flags
) &&
356 !test_bit (EVENT_DEV_ASLEEP
, &dev
->flags
)) {
357 switch (retval
= usb_submit_urb (urb
, GFP_ATOMIC
)) {
359 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
362 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
365 netif_dbg(dev
, ifdown
, dev
->net
, "device gone\n");
366 netif_device_detach (dev
->net
);
369 netif_dbg(dev
, rx_err
, dev
->net
,
370 "rx submit, %d\n", retval
);
371 tasklet_schedule (&dev
->bh
);
374 __skb_queue_tail (&dev
->rxq
, skb
);
377 netif_dbg(dev
, ifdown
, dev
->net
, "rx: stopped\n");
380 spin_unlock_irqrestore (&dev
->rxq
.lock
, lockflags
);
382 dev_kfree_skb_any (skb
);
388 /*-------------------------------------------------------------------------*/
390 static inline void rx_process (struct usbnet
*dev
, struct sk_buff
*skb
)
392 if (dev
->driver_info
->rx_fixup
&&
393 !dev
->driver_info
->rx_fixup (dev
, skb
))
395 // else network stack removes extra byte if we forced a short packet
398 usbnet_skb_return (dev
, skb
);
400 netif_dbg(dev
, rx_err
, dev
->net
, "drop\n");
402 dev
->net
->stats
.rx_errors
++;
403 skb_queue_tail (&dev
->done
, skb
);
407 /*-------------------------------------------------------------------------*/
409 static void rx_complete (struct urb
*urb
)
411 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
412 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
413 struct usbnet
*dev
= entry
->dev
;
414 int urb_status
= urb
->status
;
416 skb_put (skb
, urb
->actual_length
);
417 entry
->state
= rx_done
;
420 switch (urb_status
) {
423 if (skb
->len
< dev
->net
->hard_header_len
) {
424 entry
->state
= rx_cleanup
;
425 dev
->net
->stats
.rx_errors
++;
426 dev
->net
->stats
.rx_length_errors
++;
427 netif_dbg(dev
, rx_err
, dev
->net
,
428 "rx length %d\n", skb
->len
);
432 /* stalls need manual reset. this is rare ... except that
433 * when going through USB 2.0 TTs, unplug appears this way.
434 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
435 * storm, recovering as needed.
438 dev
->net
->stats
.rx_errors
++;
439 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
442 /* software-driven interface shutdown */
443 case -ECONNRESET
: /* async unlink */
444 case -ESHUTDOWN
: /* hardware gone */
445 netif_dbg(dev
, ifdown
, dev
->net
,
446 "rx shutdown, code %d\n", urb_status
);
449 /* we get controller i/o faults during khubd disconnect() delays.
450 * throttle down resubmits, to avoid log floods; just temporarily,
451 * so we still recover when the fault isn't a khubd delay.
456 dev
->net
->stats
.rx_errors
++;
457 if (!timer_pending (&dev
->delay
)) {
458 mod_timer (&dev
->delay
, jiffies
+ THROTTLE_JIFFIES
);
459 netif_dbg(dev
, link
, dev
->net
,
460 "rx throttle %d\n", urb_status
);
463 entry
->state
= rx_cleanup
;
468 /* data overrun ... flush fifo? */
470 dev
->net
->stats
.rx_over_errors
++;
474 entry
->state
= rx_cleanup
;
475 dev
->net
->stats
.rx_errors
++;
476 netif_dbg(dev
, rx_err
, dev
->net
, "rx status %d\n", urb_status
);
480 defer_bh(dev
, skb
, &dev
->rxq
);
483 if (netif_running (dev
->net
) &&
484 !test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
485 rx_submit (dev
, urb
, GFP_ATOMIC
);
490 netif_dbg(dev
, rx_err
, dev
->net
, "no read resubmitted\n");
493 static void intr_complete (struct urb
*urb
)
495 struct usbnet
*dev
= urb
->context
;
496 int status
= urb
->status
;
501 dev
->driver_info
->status(dev
, urb
);
504 /* software-driven interface shutdown */
505 case -ENOENT
: /* urb killed */
506 case -ESHUTDOWN
: /* hardware gone */
507 netif_dbg(dev
, ifdown
, dev
->net
,
508 "intr shutdown, code %d\n", status
);
511 /* NOTE: not throttling like RX/TX, since this endpoint
512 * already polls infrequently
515 netdev_dbg(dev
->net
, "intr status %d\n", status
);
519 if (!netif_running (dev
->net
))
522 memset(urb
->transfer_buffer
, 0, urb
->transfer_buffer_length
);
523 status
= usb_submit_urb (urb
, GFP_ATOMIC
);
525 netif_err(dev
, timer
, dev
->net
,
526 "intr resubmit --> %d\n", status
);
529 /*-------------------------------------------------------------------------*/
530 void usbnet_pause_rx(struct usbnet
*dev
)
532 set_bit(EVENT_RX_PAUSED
, &dev
->flags
);
534 netif_dbg(dev
, rx_status
, dev
->net
, "paused rx queue enabled\n");
536 EXPORT_SYMBOL_GPL(usbnet_pause_rx
);
538 void usbnet_resume_rx(struct usbnet
*dev
)
543 clear_bit(EVENT_RX_PAUSED
, &dev
->flags
);
545 while ((skb
= skb_dequeue(&dev
->rxq_pause
)) != NULL
) {
546 usbnet_skb_return(dev
, skb
);
550 tasklet_schedule(&dev
->bh
);
552 netif_dbg(dev
, rx_status
, dev
->net
,
553 "paused rx queue disabled, %d skbs requeued\n", num
);
555 EXPORT_SYMBOL_GPL(usbnet_resume_rx
);
557 void usbnet_purge_paused_rxq(struct usbnet
*dev
)
559 skb_queue_purge(&dev
->rxq_pause
);
561 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq
);
563 /*-------------------------------------------------------------------------*/
565 // unlink pending rx/tx; completion handlers do all other cleanup
567 static int unlink_urbs (struct usbnet
*dev
, struct sk_buff_head
*q
)
570 struct sk_buff
*skb
, *skbnext
;
573 spin_lock_irqsave (&q
->lock
, flags
);
574 skb_queue_walk_safe(q
, skb
, skbnext
) {
575 struct skb_data
*entry
;
579 entry
= (struct skb_data
*) skb
->cb
;
582 // during some PM-driven resume scenarios,
583 // these (async) unlinks complete immediately
584 retval
= usb_unlink_urb (urb
);
585 if (retval
!= -EINPROGRESS
&& retval
!= 0)
586 netdev_dbg(dev
->net
, "unlink urb err, %d\n", retval
);
590 spin_unlock_irqrestore (&q
->lock
, flags
);
594 // Flush all pending rx urbs
595 // minidrivers may need to do this when the MTU changes
597 void usbnet_unlink_rx_urbs(struct usbnet
*dev
)
599 if (netif_running(dev
->net
)) {
600 (void) unlink_urbs (dev
, &dev
->rxq
);
601 tasklet_schedule(&dev
->bh
);
604 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs
);
606 /*-------------------------------------------------------------------------*/
608 // precondition: never called in_interrupt
609 static void usbnet_terminate_urbs(struct usbnet
*dev
)
611 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup
);
612 DECLARE_WAITQUEUE(wait
, current
);
615 /* ensure there are no more active urbs */
616 add_wait_queue(&unlink_wakeup
, &wait
);
617 set_current_state(TASK_UNINTERRUPTIBLE
);
618 dev
->wait
= &unlink_wakeup
;
619 temp
= unlink_urbs(dev
, &dev
->txq
) +
620 unlink_urbs(dev
, &dev
->rxq
);
622 /* maybe wait for deletions to finish. */
623 while (!skb_queue_empty(&dev
->rxq
)
624 && !skb_queue_empty(&dev
->txq
)
625 && !skb_queue_empty(&dev
->done
)) {
626 schedule_timeout(UNLINK_TIMEOUT_MS
);
627 set_current_state(TASK_UNINTERRUPTIBLE
);
628 netif_dbg(dev
, ifdown
, dev
->net
,
629 "waited for %d urb completions\n", temp
);
631 set_current_state(TASK_RUNNING
);
633 remove_wait_queue(&unlink_wakeup
, &wait
);
636 int usbnet_stop (struct net_device
*net
)
638 struct usbnet
*dev
= netdev_priv(net
);
639 struct driver_info
*info
= dev
->driver_info
;
642 netif_stop_queue (net
);
644 netif_info(dev
, ifdown
, dev
->net
,
645 "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
646 net
->stats
.rx_packets
, net
->stats
.tx_packets
,
647 net
->stats
.rx_errors
, net
->stats
.tx_errors
);
649 /* allow minidriver to stop correctly (wireless devices to turn off
652 retval
= info
->stop(dev
);
654 netif_info(dev
, ifdown
, dev
->net
,
655 "stop fail (%d) usbnet usb-%s-%s, %s\n",
657 dev
->udev
->bus
->bus_name
, dev
->udev
->devpath
,
661 if (!(info
->flags
& FLAG_AVOID_UNLINK_URBS
))
662 usbnet_terminate_urbs(dev
);
664 usb_kill_urb(dev
->interrupt
);
666 usbnet_purge_paused_rxq(dev
);
668 /* deferred work (task, timer, softirq) must also stop.
669 * can't flush_scheduled_work() until we drop rtnl (later),
670 * else workers could deadlock; so make workers a NOP.
673 del_timer_sync (&dev
->delay
);
674 tasklet_kill (&dev
->bh
);
675 if (info
->manage_power
)
676 info
->manage_power(dev
, 0);
678 usb_autopm_put_interface(dev
->intf
);
682 EXPORT_SYMBOL_GPL(usbnet_stop
);
684 /*-------------------------------------------------------------------------*/
686 // posts reads, and enables write queuing
688 // precondition: never called in_interrupt
690 int usbnet_open (struct net_device
*net
)
692 struct usbnet
*dev
= netdev_priv(net
);
694 struct driver_info
*info
= dev
->driver_info
;
696 if ((retval
= usb_autopm_get_interface(dev
->intf
)) < 0) {
697 netif_info(dev
, ifup
, dev
->net
,
698 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
700 dev
->udev
->bus
->bus_name
,
706 // put into "known safe" state
707 if (info
->reset
&& (retval
= info
->reset (dev
)) < 0) {
708 netif_info(dev
, ifup
, dev
->net
,
709 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
711 dev
->udev
->bus
->bus_name
,
717 // insist peer be connected
718 if (info
->check_connect
&& (retval
= info
->check_connect (dev
)) < 0) {
719 netif_dbg(dev
, ifup
, dev
->net
, "can't open; %d\n", retval
);
723 /* start any status interrupt transfer */
724 if (dev
->interrupt
) {
725 retval
= usb_submit_urb (dev
->interrupt
, GFP_KERNEL
);
727 netif_err(dev
, ifup
, dev
->net
,
728 "intr submit %d\n", retval
);
733 netif_start_queue (net
);
734 netif_info(dev
, ifup
, dev
->net
,
735 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
736 (int)RX_QLEN(dev
), (int)TX_QLEN(dev
),
738 (dev
->driver_info
->flags
& FLAG_FRAMING_NC
) ? "NetChip" :
739 (dev
->driver_info
->flags
& FLAG_FRAMING_GL
) ? "GeneSys" :
740 (dev
->driver_info
->flags
& FLAG_FRAMING_Z
) ? "Zaurus" :
741 (dev
->driver_info
->flags
& FLAG_FRAMING_RN
) ? "RNDIS" :
742 (dev
->driver_info
->flags
& FLAG_FRAMING_AX
) ? "ASIX" :
745 // delay posting reads until we're fully open
746 tasklet_schedule (&dev
->bh
);
747 if (info
->manage_power
) {
748 retval
= info
->manage_power(dev
, 1);
751 usb_autopm_put_interface(dev
->intf
);
756 usb_autopm_put_interface(dev
->intf
);
760 EXPORT_SYMBOL_GPL(usbnet_open
);
762 /*-------------------------------------------------------------------------*/
764 /* ethtool methods; minidrivers may need to add some more, but
765 * they'll probably want to use this base set.
768 int usbnet_get_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
770 struct usbnet
*dev
= netdev_priv(net
);
772 if (!dev
->mii
.mdio_read
)
775 return mii_ethtool_gset(&dev
->mii
, cmd
);
777 EXPORT_SYMBOL_GPL(usbnet_get_settings
);
779 int usbnet_set_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
781 struct usbnet
*dev
= netdev_priv(net
);
784 if (!dev
->mii
.mdio_write
)
787 retval
= mii_ethtool_sset(&dev
->mii
, cmd
);
789 /* link speed/duplex might have changed */
790 if (dev
->driver_info
->link_reset
)
791 dev
->driver_info
->link_reset(dev
);
796 EXPORT_SYMBOL_GPL(usbnet_set_settings
);
798 u32
usbnet_get_link (struct net_device
*net
)
800 struct usbnet
*dev
= netdev_priv(net
);
802 /* If a check_connect is defined, return its result */
803 if (dev
->driver_info
->check_connect
)
804 return dev
->driver_info
->check_connect (dev
) == 0;
806 /* if the device has mii operations, use those */
807 if (dev
->mii
.mdio_read
)
808 return mii_link_ok(&dev
->mii
);
810 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
811 return ethtool_op_get_link(net
);
813 EXPORT_SYMBOL_GPL(usbnet_get_link
);
815 int usbnet_nway_reset(struct net_device
*net
)
817 struct usbnet
*dev
= netdev_priv(net
);
819 if (!dev
->mii
.mdio_write
)
822 return mii_nway_restart(&dev
->mii
);
824 EXPORT_SYMBOL_GPL(usbnet_nway_reset
);
826 void usbnet_get_drvinfo (struct net_device
*net
, struct ethtool_drvinfo
*info
)
828 struct usbnet
*dev
= netdev_priv(net
);
830 strncpy (info
->driver
, dev
->driver_name
, sizeof info
->driver
);
831 strncpy (info
->version
, DRIVER_VERSION
, sizeof info
->version
);
832 strncpy (info
->fw_version
, dev
->driver_info
->description
,
833 sizeof info
->fw_version
);
834 usb_make_path (dev
->udev
, info
->bus_info
, sizeof info
->bus_info
);
836 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo
);
838 u32
usbnet_get_msglevel (struct net_device
*net
)
840 struct usbnet
*dev
= netdev_priv(net
);
842 return dev
->msg_enable
;
844 EXPORT_SYMBOL_GPL(usbnet_get_msglevel
);
846 void usbnet_set_msglevel (struct net_device
*net
, u32 level
)
848 struct usbnet
*dev
= netdev_priv(net
);
850 dev
->msg_enable
= level
;
852 EXPORT_SYMBOL_GPL(usbnet_set_msglevel
);
854 /* drivers may override default ethtool_ops in their bind() routine */
855 static const struct ethtool_ops usbnet_ethtool_ops
= {
856 .get_settings
= usbnet_get_settings
,
857 .set_settings
= usbnet_set_settings
,
858 .get_link
= usbnet_get_link
,
859 .nway_reset
= usbnet_nway_reset
,
860 .get_drvinfo
= usbnet_get_drvinfo
,
861 .get_msglevel
= usbnet_get_msglevel
,
862 .set_msglevel
= usbnet_set_msglevel
,
865 /*-------------------------------------------------------------------------*/
867 /* work that cannot be done in interrupt context uses keventd.
869 * NOTE: with 2.5 we could do more of this using completion callbacks,
870 * especially now that control transfers can be queued.
873 kevent (struct work_struct
*work
)
876 container_of(work
, struct usbnet
, kevent
);
879 /* usb_clear_halt() needs a thread context */
880 if (test_bit (EVENT_TX_HALT
, &dev
->flags
)) {
881 unlink_urbs (dev
, &dev
->txq
);
882 status
= usb_autopm_get_interface(dev
->intf
);
885 status
= usb_clear_halt (dev
->udev
, dev
->out
);
886 usb_autopm_put_interface(dev
->intf
);
889 status
!= -ESHUTDOWN
) {
890 if (netif_msg_tx_err (dev
))
892 netdev_err(dev
->net
, "can't clear tx halt, status %d\n",
895 clear_bit (EVENT_TX_HALT
, &dev
->flags
);
896 if (status
!= -ESHUTDOWN
)
897 netif_wake_queue (dev
->net
);
900 if (test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
901 unlink_urbs (dev
, &dev
->rxq
);
902 status
= usb_autopm_get_interface(dev
->intf
);
905 status
= usb_clear_halt (dev
->udev
, dev
->in
);
906 usb_autopm_put_interface(dev
->intf
);
909 status
!= -ESHUTDOWN
) {
910 if (netif_msg_rx_err (dev
))
912 netdev_err(dev
->net
, "can't clear rx halt, status %d\n",
915 clear_bit (EVENT_RX_HALT
, &dev
->flags
);
916 tasklet_schedule (&dev
->bh
);
920 /* tasklet could resubmit itself forever if memory is tight */
921 if (test_bit (EVENT_RX_MEMORY
, &dev
->flags
)) {
922 struct urb
*urb
= NULL
;
924 if (netif_running (dev
->net
))
925 urb
= usb_alloc_urb (0, GFP_KERNEL
);
927 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
929 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
930 status
= usb_autopm_get_interface(dev
->intf
);
933 rx_submit (dev
, urb
, GFP_KERNEL
);
934 usb_autopm_put_interface(dev
->intf
);
936 tasklet_schedule (&dev
->bh
);
940 if (test_bit (EVENT_LINK_RESET
, &dev
->flags
)) {
941 struct driver_info
*info
= dev
->driver_info
;
944 clear_bit (EVENT_LINK_RESET
, &dev
->flags
);
945 status
= usb_autopm_get_interface(dev
->intf
);
948 if(info
->link_reset
&& (retval
= info
->link_reset(dev
)) < 0) {
949 usb_autopm_put_interface(dev
->intf
);
951 netdev_info(dev
->net
, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
953 dev
->udev
->bus
->bus_name
,
957 usb_autopm_put_interface(dev
->intf
);
962 netdev_dbg(dev
->net
, "kevent done, flags = 0x%lx\n", dev
->flags
);
965 /*-------------------------------------------------------------------------*/
967 static void tx_complete (struct urb
*urb
)
969 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
970 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
971 struct usbnet
*dev
= entry
->dev
;
973 if (urb
->status
== 0) {
974 dev
->net
->stats
.tx_packets
++;
975 dev
->net
->stats
.tx_bytes
+= entry
->length
;
977 dev
->net
->stats
.tx_errors
++;
979 switch (urb
->status
) {
981 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
984 /* software-driven interface shutdown */
985 case -ECONNRESET
: // async unlink
986 case -ESHUTDOWN
: // hardware gone
989 // like rx, tx gets controller i/o faults during khubd delays
990 // and so it uses the same throttling mechanism.
994 usb_mark_last_busy(dev
->udev
);
995 if (!timer_pending (&dev
->delay
)) {
996 mod_timer (&dev
->delay
,
997 jiffies
+ THROTTLE_JIFFIES
);
998 netif_dbg(dev
, link
, dev
->net
,
999 "tx throttle %d\n", urb
->status
);
1001 netif_stop_queue (dev
->net
);
1004 netif_dbg(dev
, tx_err
, dev
->net
,
1005 "tx err %d\n", entry
->urb
->status
);
1010 usb_autopm_put_interface_async(dev
->intf
);
1012 entry
->state
= tx_done
;
1013 defer_bh(dev
, skb
, &dev
->txq
);
1016 /*-------------------------------------------------------------------------*/
1018 void usbnet_tx_timeout (struct net_device
*net
)
1020 struct usbnet
*dev
= netdev_priv(net
);
1022 unlink_urbs (dev
, &dev
->txq
);
1023 tasklet_schedule (&dev
->bh
);
1025 // FIXME: device recovery -- reset?
1027 EXPORT_SYMBOL_GPL(usbnet_tx_timeout
);
1029 /*-------------------------------------------------------------------------*/
1031 netdev_tx_t
usbnet_start_xmit (struct sk_buff
*skb
,
1032 struct net_device
*net
)
1034 struct usbnet
*dev
= netdev_priv(net
);
1036 struct urb
*urb
= NULL
;
1037 struct skb_data
*entry
;
1038 struct driver_info
*info
= dev
->driver_info
;
1039 unsigned long flags
;
1042 // some devices want funky USB-level framing, for
1043 // win32 driver (usually) and/or hardware quirks
1044 if (info
->tx_fixup
) {
1045 skb
= info
->tx_fixup (dev
, skb
, GFP_ATOMIC
);
1047 netif_dbg(dev
, tx_err
, dev
->net
, "can't tx_fixup skb\n");
1053 if (!(urb
= usb_alloc_urb (0, GFP_ATOMIC
))) {
1054 netif_dbg(dev
, tx_err
, dev
->net
, "no urb\n");
1058 entry
= (struct skb_data
*) skb
->cb
;
1061 entry
->state
= tx_start
;
1062 entry
->length
= length
;
1064 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->out
,
1065 skb
->data
, skb
->len
, tx_complete
, skb
);
1067 /* don't assume the hardware handles USB_ZERO_PACKET
1068 * NOTE: strictly conforming cdc-ether devices should expect
1069 * the ZLP here, but ignore the one-byte packet.
1071 if (!(info
->flags
& FLAG_SEND_ZLP
) && (length
% dev
->maxpacket
) == 0) {
1072 urb
->transfer_buffer_length
++;
1073 if (skb_tailroom(skb
)) {
1074 skb
->data
[skb
->len
] = 0;
1079 spin_lock_irqsave(&dev
->txq
.lock
, flags
);
1080 retval
= usb_autopm_get_interface_async(dev
->intf
);
1082 spin_unlock_irqrestore(&dev
->txq
.lock
, flags
);
1087 /* if this triggers the device is still a sleep */
1088 if (test_bit(EVENT_DEV_ASLEEP
, &dev
->flags
)) {
1089 /* transmission will be done in resume */
1090 usb_anchor_urb(urb
, &dev
->deferred
);
1091 /* no use to process more packets */
1092 netif_stop_queue(net
);
1093 spin_unlock_irqrestore(&dev
->txq
.lock
, flags
);
1094 netdev_dbg(dev
->net
, "Delaying transmission for resumption\n");
1099 switch ((retval
= usb_submit_urb (urb
, GFP_ATOMIC
))) {
1101 netif_stop_queue (net
);
1102 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
1103 usb_autopm_put_interface_async(dev
->intf
);
1106 usb_autopm_put_interface_async(dev
->intf
);
1107 netif_dbg(dev
, tx_err
, dev
->net
,
1108 "tx: submit urb err %d\n", retval
);
1111 net
->trans_start
= jiffies
;
1112 __skb_queue_tail (&dev
->txq
, skb
);
1113 if (dev
->txq
.qlen
>= TX_QLEN (dev
))
1114 netif_stop_queue (net
);
1116 spin_unlock_irqrestore (&dev
->txq
.lock
, flags
);
1119 netif_dbg(dev
, tx_err
, dev
->net
, "drop, code %d\n", retval
);
1121 dev
->net
->stats
.tx_dropped
++;
1123 dev_kfree_skb_any (skb
);
1126 netif_dbg(dev
, tx_queued
, dev
->net
,
1127 "> tx, len %d, type 0x%x\n", length
, skb
->protocol
);
1131 return NETDEV_TX_OK
;
1133 EXPORT_SYMBOL_GPL(usbnet_start_xmit
);
1135 /*-------------------------------------------------------------------------*/
1137 // tasklet (work deferred from completions, in_irq) or timer
1139 static void usbnet_bh (unsigned long param
)
1141 struct usbnet
*dev
= (struct usbnet
*) param
;
1142 struct sk_buff
*skb
;
1143 struct skb_data
*entry
;
1145 while ((skb
= skb_dequeue (&dev
->done
))) {
1146 entry
= (struct skb_data
*) skb
->cb
;
1147 switch (entry
->state
) {
1149 entry
->state
= rx_cleanup
;
1150 rx_process (dev
, skb
);
1154 usb_free_urb (entry
->urb
);
1155 dev_kfree_skb (skb
);
1158 netdev_dbg(dev
->net
, "bogus skb state %d\n", entry
->state
);
1162 // waiting for all pending urbs to complete?
1164 if ((dev
->txq
.qlen
+ dev
->rxq
.qlen
+ dev
->done
.qlen
) == 0) {
1165 wake_up (dev
->wait
);
1168 // or are we maybe short a few urbs?
1169 } else if (netif_running (dev
->net
) &&
1170 netif_device_present (dev
->net
) &&
1171 !timer_pending (&dev
->delay
) &&
1172 !test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
1173 int temp
= dev
->rxq
.qlen
;
1174 int qlen
= RX_QLEN (dev
);
1180 // don't refill the queue all at once
1181 for (i
= 0; i
< 10 && dev
->rxq
.qlen
< qlen
; i
++) {
1182 urb
= usb_alloc_urb (0, GFP_ATOMIC
);
1184 rx_submit (dev
, urb
, GFP_ATOMIC
);
1186 if (temp
!= dev
->rxq
.qlen
)
1187 netif_dbg(dev
, link
, dev
->net
,
1188 "rxqlen %d --> %d\n",
1189 temp
, dev
->rxq
.qlen
);
1190 if (dev
->rxq
.qlen
< qlen
)
1191 tasklet_schedule (&dev
->bh
);
1193 if (dev
->txq
.qlen
< TX_QLEN (dev
))
1194 netif_wake_queue (dev
->net
);
1199 /*-------------------------------------------------------------------------
1201 * USB Device Driver support
1203 *-------------------------------------------------------------------------*/
1205 // precondition: never called in_interrupt
1207 void usbnet_disconnect (struct usb_interface
*intf
)
1210 struct usb_device
*xdev
;
1211 struct net_device
*net
;
1213 dev
= usb_get_intfdata(intf
);
1214 usb_set_intfdata(intf
, NULL
);
1218 xdev
= interface_to_usbdev (intf
);
1220 netif_info(dev
, probe
, dev
->net
, "unregister '%s' usb-%s-%s, %s\n",
1221 intf
->dev
.driver
->name
,
1222 xdev
->bus
->bus_name
, xdev
->devpath
,
1223 dev
->driver_info
->description
);
1226 unregister_netdev (net
);
1228 /* we don't hold rtnl here ... */
1229 flush_scheduled_work ();
1231 if (dev
->driver_info
->unbind
)
1232 dev
->driver_info
->unbind (dev
, intf
);
1237 EXPORT_SYMBOL_GPL(usbnet_disconnect
);
1239 static const struct net_device_ops usbnet_netdev_ops
= {
1240 .ndo_open
= usbnet_open
,
1241 .ndo_stop
= usbnet_stop
,
1242 .ndo_start_xmit
= usbnet_start_xmit
,
1243 .ndo_tx_timeout
= usbnet_tx_timeout
,
1244 .ndo_change_mtu
= usbnet_change_mtu
,
1245 .ndo_set_mac_address
= eth_mac_addr
,
1246 .ndo_validate_addr
= eth_validate_addr
,
1249 /*-------------------------------------------------------------------------*/
1251 // precondition: never called in_interrupt
1253 static struct device_type wlan_type
= {
1257 static struct device_type wwan_type
= {
1262 usbnet_probe (struct usb_interface
*udev
, const struct usb_device_id
*prod
)
1265 struct net_device
*net
;
1266 struct usb_host_interface
*interface
;
1267 struct driver_info
*info
;
1268 struct usb_device
*xdev
;
1272 name
= udev
->dev
.driver
->name
;
1273 info
= (struct driver_info
*) prod
->driver_info
;
1275 dev_dbg (&udev
->dev
, "blacklisted by %s\n", name
);
1278 xdev
= interface_to_usbdev (udev
);
1279 interface
= udev
->cur_altsetting
;
1285 // set up our own records
1286 net
= alloc_etherdev(sizeof(*dev
));
1288 dbg ("can't kmalloc dev");
1292 dev
= netdev_priv(net
);
1295 dev
->driver_info
= info
;
1296 dev
->driver_name
= name
;
1297 dev
->msg_enable
= netif_msg_init (msg_level
, NETIF_MSG_DRV
1298 | NETIF_MSG_PROBE
| NETIF_MSG_LINK
);
1299 skb_queue_head_init (&dev
->rxq
);
1300 skb_queue_head_init (&dev
->txq
);
1301 skb_queue_head_init (&dev
->done
);
1302 skb_queue_head_init(&dev
->rxq_pause
);
1303 dev
->bh
.func
= usbnet_bh
;
1304 dev
->bh
.data
= (unsigned long) dev
;
1305 INIT_WORK (&dev
->kevent
, kevent
);
1306 init_usb_anchor(&dev
->deferred
);
1307 dev
->delay
.function
= usbnet_bh
;
1308 dev
->delay
.data
= (unsigned long) dev
;
1309 init_timer (&dev
->delay
);
1310 mutex_init (&dev
->phy_mutex
);
1313 strcpy (net
->name
, "usb%d");
1314 memcpy (net
->dev_addr
, node_id
, sizeof node_id
);
1316 /* rx and tx sides can use different message sizes;
1317 * bind() should set rx_urb_size in that case.
1319 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
1321 // dma_supported() is deeply broken on almost all architectures
1322 // possible with some EHCI controllers
1323 if (dma_supported (&udev
->dev
, DMA_BIT_MASK(64)))
1324 net
->features
|= NETIF_F_HIGHDMA
;
1327 net
->netdev_ops
= &usbnet_netdev_ops
;
1328 net
->watchdog_timeo
= TX_TIMEOUT_JIFFIES
;
1329 net
->ethtool_ops
= &usbnet_ethtool_ops
;
1331 // allow device-specific bind/init procedures
1332 // NOTE net->name still not usable ...
1334 status
= info
->bind (dev
, udev
);
1338 // heuristic: "usb%d" for links we know are two-host,
1339 // else "eth%d" when there's reasonable doubt. userspace
1340 // can rename the link if it knows better.
1341 if ((dev
->driver_info
->flags
& FLAG_ETHER
) != 0 &&
1342 (net
->dev_addr
[0] & 0x02) == 0)
1343 strcpy (net
->name
, "eth%d");
1344 /* WLAN devices should always be named "wlan%d" */
1345 if ((dev
->driver_info
->flags
& FLAG_WLAN
) != 0)
1346 strcpy(net
->name
, "wlan%d");
1347 /* WWAN devices should always be named "wwan%d" */
1348 if ((dev
->driver_info
->flags
& FLAG_WWAN
) != 0)
1349 strcpy(net
->name
, "wwan%d");
1351 /* maybe the remote can't receive an Ethernet MTU */
1352 if (net
->mtu
> (dev
->hard_mtu
- net
->hard_header_len
))
1353 net
->mtu
= dev
->hard_mtu
- net
->hard_header_len
;
1354 } else if (!info
->in
|| !info
->out
)
1355 status
= usbnet_get_endpoints (dev
, udev
);
1357 dev
->in
= usb_rcvbulkpipe (xdev
, info
->in
);
1358 dev
->out
= usb_sndbulkpipe (xdev
, info
->out
);
1359 if (!(info
->flags
& FLAG_NO_SETINT
))
1360 status
= usb_set_interface (xdev
,
1361 interface
->desc
.bInterfaceNumber
,
1362 interface
->desc
.bAlternateSetting
);
1367 if (status
>= 0 && dev
->status
)
1368 status
= init_status (dev
, udev
);
1372 if (!dev
->rx_urb_size
)
1373 dev
->rx_urb_size
= dev
->hard_mtu
;
1374 dev
->maxpacket
= usb_maxpacket (dev
->udev
, dev
->out
, 1);
1376 SET_NETDEV_DEV(net
, &udev
->dev
);
1378 if ((dev
->driver_info
->flags
& FLAG_WLAN
) != 0)
1379 SET_NETDEV_DEVTYPE(net
, &wlan_type
);
1380 if ((dev
->driver_info
->flags
& FLAG_WWAN
) != 0)
1381 SET_NETDEV_DEVTYPE(net
, &wwan_type
);
1383 status
= register_netdev (net
);
1386 netif_info(dev
, probe
, dev
->net
,
1387 "register '%s' at usb-%s-%s, %s, %pM\n",
1388 udev
->dev
.driver
->name
,
1389 xdev
->bus
->bus_name
, xdev
->devpath
,
1390 dev
->driver_info
->description
,
1393 // ok, it's ready to go.
1394 usb_set_intfdata (udev
, dev
);
1396 netif_device_attach (net
);
1398 if (dev
->driver_info
->flags
& FLAG_LINK_INTR
)
1399 netif_carrier_off(net
);
1405 info
->unbind (dev
, udev
);
1412 EXPORT_SYMBOL_GPL(usbnet_probe
);
1414 /*-------------------------------------------------------------------------*/
1417 * suspend the whole driver as soon as the first interface is suspended
1418 * resume only when the last interface is resumed
1421 int usbnet_suspend (struct usb_interface
*intf
, pm_message_t message
)
1423 struct usbnet
*dev
= usb_get_intfdata(intf
);
1425 if (!dev
->suspend_count
++) {
1426 spin_lock_irq(&dev
->txq
.lock
);
1427 /* don't autosuspend while transmitting */
1428 if (dev
->txq
.qlen
&& (message
.event
& PM_EVENT_AUTO
)) {
1429 spin_unlock_irq(&dev
->txq
.lock
);
1432 set_bit(EVENT_DEV_ASLEEP
, &dev
->flags
);
1433 spin_unlock_irq(&dev
->txq
.lock
);
1436 * accelerate emptying of the rx and queues, to avoid
1437 * having everything error out.
1439 netif_device_detach (dev
->net
);
1440 usbnet_terminate_urbs(dev
);
1441 usb_kill_urb(dev
->interrupt
);
1444 * reattach so runtime management can use and
1447 netif_device_attach (dev
->net
);
1451 EXPORT_SYMBOL_GPL(usbnet_suspend
);
1453 int usbnet_resume (struct usb_interface
*intf
)
1455 struct usbnet
*dev
= usb_get_intfdata(intf
);
1456 struct sk_buff
*skb
;
1460 if (!--dev
->suspend_count
) {
1461 spin_lock_irq(&dev
->txq
.lock
);
1462 while ((res
= usb_get_from_anchor(&dev
->deferred
))) {
1464 printk(KERN_INFO
"%s has delayed data\n", __func__
);
1465 skb
= (struct sk_buff
*)res
->context
;
1466 retval
= usb_submit_urb(res
, GFP_ATOMIC
);
1468 dev_kfree_skb_any(skb
);
1470 usb_autopm_put_interface_async(dev
->intf
);
1472 dev
->net
->trans_start
= jiffies
;
1473 __skb_queue_tail(&dev
->txq
, skb
);
1478 clear_bit(EVENT_DEV_ASLEEP
, &dev
->flags
);
1479 spin_unlock_irq(&dev
->txq
.lock
);
1480 if (!(dev
->txq
.qlen
>= TX_QLEN(dev
)))
1481 netif_start_queue(dev
->net
);
1482 tasklet_schedule (&dev
->bh
);
1486 EXPORT_SYMBOL_GPL(usbnet_resume
);
1489 /*-------------------------------------------------------------------------*/
1491 static int __init
usbnet_init(void)
1493 /* compiler should optimize this out */
1494 BUILD_BUG_ON (sizeof (((struct sk_buff
*)0)->cb
)
1495 < sizeof (struct skb_data
));
1497 random_ether_addr(node_id
);
1500 module_init(usbnet_init
);
1502 static void __exit
usbnet_exit(void)
1505 module_exit(usbnet_exit
);
1507 MODULE_AUTHOR("David Brownell");
1508 MODULE_DESCRIPTION("USB network driver framework");
1509 MODULE_LICENSE("GPL");