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[PATCH] lockdep: annotate DECLARE_WAIT_QUEUE_HEAD
[deliverable/linux.git] / drivers / usb / net / usbnet.c
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
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.
10 *
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.
15 *
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
19 */
20
21 /*
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.
25 *
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.
31 */
32
33 // #define DEBUG // error path messages, extra info
34 // #define VERBOSE // more; success messages
35
36 #include <linux/module.h>
37 #include <linux/sched.h>
38 #include <linux/init.h>
39 #include <linux/netdevice.h>
40 #include <linux/etherdevice.h>
41 #include <linux/ethtool.h>
42 #include <linux/workqueue.h>
43 #include <linux/mii.h>
44 #include <linux/usb.h>
45
46 #include "usbnet.h"
47
48 #define DRIVER_VERSION "22-Aug-2005"
49
50
51 /*-------------------------------------------------------------------------*/
52
53 /*
54 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
55 * Several dozen bytes of IPv4 data can fit in two such transactions.
56 * One maximum size Ethernet packet takes twenty four of them.
57 * For high speed, each frame comfortably fits almost 36 max size
58 * Ethernet packets (so queues should be bigger).
59 *
60 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
61 * let the USB host controller be busy for 5msec or more before an irq
62 * is required, under load. Jumbograms change the equation.
63 */
64 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
65 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
66 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
67 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
69
70 // reawaken network queue this soon after stopping; else watchdog barks
71 #define TX_TIMEOUT_JIFFIES (5*HZ)
72
73 // throttle rx/tx briefly after some faults, so khubd might disconnect()
74 // us (it polls at HZ/4 usually) before we report too many false errors.
75 #define THROTTLE_JIFFIES (HZ/8)
76
77 // between wakeups
78 #define UNLINK_TIMEOUT_MS 3
79
80 /*-------------------------------------------------------------------------*/
81
82 // randomly generated ethernet address
83 static u8 node_id [ETH_ALEN];
84
85 static const char driver_name [] = "usbnet";
86
87 /* use ethtool to change the level for any given device */
88 static int msg_level = -1;
89 module_param (msg_level, int, 0);
90 MODULE_PARM_DESC (msg_level, "Override default message level");
91
92 /*-------------------------------------------------------------------------*/
93
94 /* handles CDC Ethernet and many other network "bulk data" interfaces */
95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
96 {
97 int tmp;
98 struct usb_host_interface *alt = NULL;
99 struct usb_host_endpoint *in = NULL, *out = NULL;
100 struct usb_host_endpoint *status = NULL;
101
102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
103 unsigned ep;
104
105 in = out = status = NULL;
106 alt = intf->altsetting + tmp;
107
108 /* take the first altsetting with in-bulk + out-bulk;
109 * remember any status endpoint, just in case;
110 * ignore other endpoints and altsetttings.
111 */
112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
113 struct usb_host_endpoint *e;
114 int intr = 0;
115
116 e = alt->endpoint + ep;
117 switch (e->desc.bmAttributes) {
118 case USB_ENDPOINT_XFER_INT:
119 if (!(e->desc.bEndpointAddress & USB_DIR_IN))
120 continue;
121 intr = 1;
122 /* FALLTHROUGH */
123 case USB_ENDPOINT_XFER_BULK:
124 break;
125 default:
126 continue;
127 }
128 if (e->desc.bEndpointAddress & USB_DIR_IN) {
129 if (!intr && !in)
130 in = e;
131 else if (intr && !status)
132 status = e;
133 } else {
134 if (!out)
135 out = e;
136 }
137 }
138 if (in && out)
139 break;
140 }
141 if (!alt || !in || !out)
142 return -EINVAL;
143
144 if (alt->desc.bAlternateSetting != 0
145 || !(dev->driver_info->flags & FLAG_NO_SETINT)) {
146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
147 alt->desc.bAlternateSetting);
148 if (tmp < 0)
149 return tmp;
150 }
151
152 dev->in = usb_rcvbulkpipe (dev->udev,
153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
154 dev->out = usb_sndbulkpipe (dev->udev,
155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->status = status;
157 return 0;
158 }
159 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
160
161 static void intr_complete (struct urb *urb);
162
163 static int init_status (struct usbnet *dev, struct usb_interface *intf)
164 {
165 char *buf = NULL;
166 unsigned pipe = 0;
167 unsigned maxp;
168 unsigned period;
169
170 if (!dev->driver_info->status)
171 return 0;
172
173 pipe = usb_rcvintpipe (dev->udev,
174 dev->status->desc.bEndpointAddress
175 & USB_ENDPOINT_NUMBER_MASK);
176 maxp = usb_maxpacket (dev->udev, pipe, 0);
177
178 /* avoid 1 msec chatter: min 8 msec poll rate */
179 period = max ((int) dev->status->desc.bInterval,
180 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
181
182 buf = kmalloc (maxp, SLAB_KERNEL);
183 if (buf) {
184 dev->interrupt = usb_alloc_urb (0, SLAB_KERNEL);
185 if (!dev->interrupt) {
186 kfree (buf);
187 return -ENOMEM;
188 } else {
189 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
190 buf, maxp, intr_complete, dev, period);
191 dev_dbg(&intf->dev,
192 "status ep%din, %d bytes period %d\n",
193 usb_pipeendpoint(pipe), maxp, period);
194 }
195 }
196 return 0;
197 }
198
199 /* Passes this packet up the stack, updating its accounting.
200 * Some link protocols batch packets, so their rx_fixup paths
201 * can return clones as well as just modify the original skb.
202 */
203 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
204 {
205 int status;
206
207 skb->dev = dev->net;
208 skb->protocol = eth_type_trans (skb, dev->net);
209 dev->stats.rx_packets++;
210 dev->stats.rx_bytes += skb->len;
211
212 if (netif_msg_rx_status (dev))
213 devdbg (dev, "< rx, len %zu, type 0x%x",
214 skb->len + sizeof (struct ethhdr), skb->protocol);
215 memset (skb->cb, 0, sizeof (struct skb_data));
216 status = netif_rx (skb);
217 if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev))
218 devdbg (dev, "netif_rx status %d", status);
219 }
220 EXPORT_SYMBOL_GPL(usbnet_skb_return);
221
222 \f
223 /*-------------------------------------------------------------------------
224 *
225 * Network Device Driver (peer link to "Host Device", from USB host)
226 *
227 *-------------------------------------------------------------------------*/
228
229 static int usbnet_change_mtu (struct net_device *net, int new_mtu)
230 {
231 struct usbnet *dev = netdev_priv(net);
232 int ll_mtu = new_mtu + net->hard_header_len;
233 int old_hard_mtu = dev->hard_mtu;
234 int old_rx_urb_size = dev->rx_urb_size;
235
236 if (new_mtu <= 0)
237 return -EINVAL;
238 // no second zero-length packet read wanted after mtu-sized packets
239 if ((ll_mtu % dev->maxpacket) == 0)
240 return -EDOM;
241 net->mtu = new_mtu;
242
243 dev->hard_mtu = net->mtu + net->hard_header_len;
244 if (dev->rx_urb_size == old_hard_mtu) {
245 dev->rx_urb_size = dev->hard_mtu;
246 if (dev->rx_urb_size > old_rx_urb_size)
247 usbnet_unlink_rx_urbs(dev);
248 }
249
250 return 0;
251 }
252
253 /*-------------------------------------------------------------------------*/
254
255 static struct net_device_stats *usbnet_get_stats (struct net_device *net)
256 {
257 struct usbnet *dev = netdev_priv(net);
258 return &dev->stats;
259 }
260
261 /*-------------------------------------------------------------------------*/
262
263 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
264 * completion callbacks. 2.5 should have fixed those bugs...
265 */
266
267 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
268 {
269 unsigned long flags;
270
271 spin_lock_irqsave(&list->lock, flags);
272 __skb_unlink(skb, list);
273 spin_unlock(&list->lock);
274 spin_lock(&dev->done.lock);
275 __skb_queue_tail(&dev->done, skb);
276 if (dev->done.qlen == 1)
277 tasklet_schedule(&dev->bh);
278 spin_unlock_irqrestore(&dev->done.lock, flags);
279 }
280
281 /* some work can't be done in tasklets, so we use keventd
282 *
283 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
284 * but tasklet_schedule() doesn't. hope the failure is rare.
285 */
286 void usbnet_defer_kevent (struct usbnet *dev, int work)
287 {
288 set_bit (work, &dev->flags);
289 if (!schedule_work (&dev->kevent))
290 deverr (dev, "kevent %d may have been dropped", work);
291 else
292 devdbg (dev, "kevent %d scheduled", work);
293 }
294 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
295
296 /*-------------------------------------------------------------------------*/
297
298 static void rx_complete (struct urb *urb);
299
300 static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
301 {
302 struct sk_buff *skb;
303 struct skb_data *entry;
304 int retval = 0;
305 unsigned long lockflags;
306 size_t size = dev->rx_urb_size;
307
308 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
309 if (netif_msg_rx_err (dev))
310 devdbg (dev, "no rx skb");
311 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
312 usb_free_urb (urb);
313 return;
314 }
315 skb_reserve (skb, NET_IP_ALIGN);
316
317 entry = (struct skb_data *) skb->cb;
318 entry->urb = urb;
319 entry->dev = dev;
320 entry->state = rx_start;
321 entry->length = 0;
322
323 usb_fill_bulk_urb (urb, dev->udev, dev->in,
324 skb->data, size, rx_complete, skb);
325
326 spin_lock_irqsave (&dev->rxq.lock, lockflags);
327
328 if (netif_running (dev->net)
329 && netif_device_present (dev->net)
330 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
331 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)){
332 case -EPIPE:
333 usbnet_defer_kevent (dev, EVENT_RX_HALT);
334 break;
335 case -ENOMEM:
336 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
337 break;
338 case -ENODEV:
339 if (netif_msg_ifdown (dev))
340 devdbg (dev, "device gone");
341 netif_device_detach (dev->net);
342 break;
343 default:
344 if (netif_msg_rx_err (dev))
345 devdbg (dev, "rx submit, %d", retval);
346 tasklet_schedule (&dev->bh);
347 break;
348 case 0:
349 __skb_queue_tail (&dev->rxq, skb);
350 }
351 } else {
352 if (netif_msg_ifdown (dev))
353 devdbg (dev, "rx: stopped");
354 retval = -ENOLINK;
355 }
356 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
357 if (retval) {
358 dev_kfree_skb_any (skb);
359 usb_free_urb (urb);
360 }
361 }
362
363
364 /*-------------------------------------------------------------------------*/
365
366 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
367 {
368 if (dev->driver_info->rx_fixup
369 && !dev->driver_info->rx_fixup (dev, skb))
370 goto error;
371 // else network stack removes extra byte if we forced a short packet
372
373 if (skb->len)
374 usbnet_skb_return (dev, skb);
375 else {
376 if (netif_msg_rx_err (dev))
377 devdbg (dev, "drop");
378 error:
379 dev->stats.rx_errors++;
380 skb_queue_tail (&dev->done, skb);
381 }
382 }
383
384 /*-------------------------------------------------------------------------*/
385
386 static void rx_complete (struct urb *urb)
387 {
388 struct sk_buff *skb = (struct sk_buff *) urb->context;
389 struct skb_data *entry = (struct skb_data *) skb->cb;
390 struct usbnet *dev = entry->dev;
391 int urb_status = urb->status;
392
393 skb_put (skb, urb->actual_length);
394 entry->state = rx_done;
395 entry->urb = NULL;
396
397 switch (urb_status) {
398 // success
399 case 0:
400 if (skb->len < dev->net->hard_header_len) {
401 entry->state = rx_cleanup;
402 dev->stats.rx_errors++;
403 dev->stats.rx_length_errors++;
404 if (netif_msg_rx_err (dev))
405 devdbg (dev, "rx length %d", skb->len);
406 }
407 break;
408
409 // stalls need manual reset. this is rare ... except that
410 // when going through USB 2.0 TTs, unplug appears this way.
411 // we avoid the highspeed version of the ETIMEOUT/EILSEQ
412 // storm, recovering as needed.
413 case -EPIPE:
414 dev->stats.rx_errors++;
415 usbnet_defer_kevent (dev, EVENT_RX_HALT);
416 // FALLTHROUGH
417
418 // software-driven interface shutdown
419 case -ECONNRESET: // async unlink
420 case -ESHUTDOWN: // hardware gone
421 if (netif_msg_ifdown (dev))
422 devdbg (dev, "rx shutdown, code %d", urb_status);
423 goto block;
424
425 // we get controller i/o faults during khubd disconnect() delays.
426 // throttle down resubmits, to avoid log floods; just temporarily,
427 // so we still recover when the fault isn't a khubd delay.
428 case -EPROTO:
429 case -ETIME:
430 case -EILSEQ:
431 dev->stats.rx_errors++;
432 if (!timer_pending (&dev->delay)) {
433 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
434 if (netif_msg_link (dev))
435 devdbg (dev, "rx throttle %d", urb_status);
436 }
437 block:
438 entry->state = rx_cleanup;
439 entry->urb = urb;
440 urb = NULL;
441 break;
442
443 // data overrun ... flush fifo?
444 case -EOVERFLOW:
445 dev->stats.rx_over_errors++;
446 // FALLTHROUGH
447
448 default:
449 entry->state = rx_cleanup;
450 dev->stats.rx_errors++;
451 if (netif_msg_rx_err (dev))
452 devdbg (dev, "rx status %d", urb_status);
453 break;
454 }
455
456 defer_bh(dev, skb, &dev->rxq);
457
458 if (urb) {
459 if (netif_running (dev->net)
460 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
461 rx_submit (dev, urb, GFP_ATOMIC);
462 return;
463 }
464 usb_free_urb (urb);
465 }
466 if (netif_msg_rx_err (dev))
467 devdbg (dev, "no read resubmitted");
468 }
469
470 static void intr_complete (struct urb *urb)
471 {
472 struct usbnet *dev = urb->context;
473 int status = urb->status;
474
475 switch (status) {
476 /* success */
477 case 0:
478 dev->driver_info->status(dev, urb);
479 break;
480
481 /* software-driven interface shutdown */
482 case -ENOENT: // urb killed
483 case -ESHUTDOWN: // hardware gone
484 if (netif_msg_ifdown (dev))
485 devdbg (dev, "intr shutdown, code %d", status);
486 return;
487
488 /* NOTE: not throttling like RX/TX, since this endpoint
489 * already polls infrequently
490 */
491 default:
492 devdbg (dev, "intr status %d", status);
493 break;
494 }
495
496 if (!netif_running (dev->net))
497 return;
498
499 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
500 status = usb_submit_urb (urb, GFP_ATOMIC);
501 if (status != 0 && netif_msg_timer (dev))
502 deverr(dev, "intr resubmit --> %d", status);
503 }
504
505 /*-------------------------------------------------------------------------*/
506
507 // unlink pending rx/tx; completion handlers do all other cleanup
508
509 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
510 {
511 unsigned long flags;
512 struct sk_buff *skb, *skbnext;
513 int count = 0;
514
515 spin_lock_irqsave (&q->lock, flags);
516 for (skb = q->next; skb != (struct sk_buff *) q; skb = skbnext) {
517 struct skb_data *entry;
518 struct urb *urb;
519 int retval;
520
521 entry = (struct skb_data *) skb->cb;
522 urb = entry->urb;
523 skbnext = skb->next;
524
525 // during some PM-driven resume scenarios,
526 // these (async) unlinks complete immediately
527 retval = usb_unlink_urb (urb);
528 if (retval != -EINPROGRESS && retval != 0)
529 devdbg (dev, "unlink urb err, %d", retval);
530 else
531 count++;
532 }
533 spin_unlock_irqrestore (&q->lock, flags);
534 return count;
535 }
536
537 // Flush all pending rx urbs
538 // minidrivers may need to do this when the MTU changes
539
540 void usbnet_unlink_rx_urbs(struct usbnet *dev)
541 {
542 if (netif_running(dev->net)) {
543 (void) unlink_urbs (dev, &dev->rxq);
544 tasklet_schedule(&dev->bh);
545 }
546 }
547 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
548
549 /*-------------------------------------------------------------------------*/
550
551 // precondition: never called in_interrupt
552
553 static int usbnet_stop (struct net_device *net)
554 {
555 struct usbnet *dev = netdev_priv(net);
556 int temp;
557 DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup);
558 DECLARE_WAITQUEUE (wait, current);
559
560 netif_stop_queue (net);
561
562 if (netif_msg_ifdown (dev))
563 devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
564 dev->stats.rx_packets, dev->stats.tx_packets,
565 dev->stats.rx_errors, dev->stats.tx_errors
566 );
567
568 // ensure there are no more active urbs
569 add_wait_queue (&unlink_wakeup, &wait);
570 dev->wait = &unlink_wakeup;
571 temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq);
572
573 // maybe wait for deletions to finish.
574 while (!skb_queue_empty(&dev->rxq) &&
575 !skb_queue_empty(&dev->txq) &&
576 !skb_queue_empty(&dev->done)) {
577 msleep(UNLINK_TIMEOUT_MS);
578 if (netif_msg_ifdown (dev))
579 devdbg (dev, "waited for %d urb completions", temp);
580 }
581 dev->wait = NULL;
582 remove_wait_queue (&unlink_wakeup, &wait);
583
584 usb_kill_urb(dev->interrupt);
585
586 /* deferred work (task, timer, softirq) must also stop.
587 * can't flush_scheduled_work() until we drop rtnl (later),
588 * else workers could deadlock; so make workers a NOP.
589 */
590 dev->flags = 0;
591 del_timer_sync (&dev->delay);
592 tasklet_kill (&dev->bh);
593
594 return 0;
595 }
596
597 /*-------------------------------------------------------------------------*/
598
599 // posts reads, and enables write queuing
600
601 // precondition: never called in_interrupt
602
603 static int usbnet_open (struct net_device *net)
604 {
605 struct usbnet *dev = netdev_priv(net);
606 int retval = 0;
607 struct driver_info *info = dev->driver_info;
608
609 // put into "known safe" state
610 if (info->reset && (retval = info->reset (dev)) < 0) {
611 if (netif_msg_ifup (dev))
612 devinfo (dev,
613 "open reset fail (%d) usbnet usb-%s-%s, %s",
614 retval,
615 dev->udev->bus->bus_name, dev->udev->devpath,
616 info->description);
617 goto done;
618 }
619
620 // insist peer be connected
621 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
622 if (netif_msg_ifup (dev))
623 devdbg (dev, "can't open; %d", retval);
624 goto done;
625 }
626
627 /* start any status interrupt transfer */
628 if (dev->interrupt) {
629 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
630 if (retval < 0) {
631 if (netif_msg_ifup (dev))
632 deverr (dev, "intr submit %d", retval);
633 goto done;
634 }
635 }
636
637 netif_start_queue (net);
638 if (netif_msg_ifup (dev)) {
639 char *framing;
640
641 if (dev->driver_info->flags & FLAG_FRAMING_NC)
642 framing = "NetChip";
643 else if (dev->driver_info->flags & FLAG_FRAMING_GL)
644 framing = "GeneSys";
645 else if (dev->driver_info->flags & FLAG_FRAMING_Z)
646 framing = "Zaurus";
647 else if (dev->driver_info->flags & FLAG_FRAMING_RN)
648 framing = "RNDIS";
649 else if (dev->driver_info->flags & FLAG_FRAMING_AX)
650 framing = "ASIX";
651 else
652 framing = "simple";
653
654 devinfo (dev, "open: enable queueing "
655 "(rx %d, tx %d) mtu %d %s framing",
656 (int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu,
657 framing);
658 }
659
660 // delay posting reads until we're fully open
661 tasklet_schedule (&dev->bh);
662 done:
663 return retval;
664 }
665
666 /*-------------------------------------------------------------------------*/
667
668 /* ethtool methods; minidrivers may need to add some more, but
669 * they'll probably want to use this base set.
670 */
671
672 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
673 {
674 struct usbnet *dev = netdev_priv(net);
675
676 if (!dev->mii.mdio_read)
677 return -EOPNOTSUPP;
678
679 return mii_ethtool_gset(&dev->mii, cmd);
680 }
681 EXPORT_SYMBOL_GPL(usbnet_get_settings);
682
683 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
684 {
685 struct usbnet *dev = netdev_priv(net);
686 int retval;
687
688 if (!dev->mii.mdio_write)
689 return -EOPNOTSUPP;
690
691 retval = mii_ethtool_sset(&dev->mii, cmd);
692
693 /* link speed/duplex might have changed */
694 if (dev->driver_info->link_reset)
695 dev->driver_info->link_reset(dev);
696
697 return retval;
698
699 }
700 EXPORT_SYMBOL_GPL(usbnet_set_settings);
701
702
703 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
704 {
705 struct usbnet *dev = netdev_priv(net);
706
707 /* REVISIT don't always return "usbnet" */
708 strncpy (info->driver, driver_name, sizeof info->driver);
709 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
710 strncpy (info->fw_version, dev->driver_info->description,
711 sizeof info->fw_version);
712 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
713 }
714 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
715
716 u32 usbnet_get_link (struct net_device *net)
717 {
718 struct usbnet *dev = netdev_priv(net);
719
720 /* If a check_connect is defined, return its result */
721 if (dev->driver_info->check_connect)
722 return dev->driver_info->check_connect (dev) == 0;
723
724 /* if the device has mii operations, use those */
725 if (dev->mii.mdio_read)
726 return mii_link_ok(&dev->mii);
727
728 /* Otherwise, say we're up (to avoid breaking scripts) */
729 return 1;
730 }
731 EXPORT_SYMBOL_GPL(usbnet_get_link);
732
733 u32 usbnet_get_msglevel (struct net_device *net)
734 {
735 struct usbnet *dev = netdev_priv(net);
736
737 return dev->msg_enable;
738 }
739 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
740
741 void usbnet_set_msglevel (struct net_device *net, u32 level)
742 {
743 struct usbnet *dev = netdev_priv(net);
744
745 dev->msg_enable = level;
746 }
747 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
748
749 int usbnet_nway_reset(struct net_device *net)
750 {
751 struct usbnet *dev = netdev_priv(net);
752
753 if (!dev->mii.mdio_write)
754 return -EOPNOTSUPP;
755
756 return mii_nway_restart(&dev->mii);
757 }
758 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
759
760 /* drivers may override default ethtool_ops in their bind() routine */
761 static struct ethtool_ops usbnet_ethtool_ops = {
762 .get_settings = usbnet_get_settings,
763 .set_settings = usbnet_set_settings,
764 .get_drvinfo = usbnet_get_drvinfo,
765 .get_link = usbnet_get_link,
766 .nway_reset = usbnet_nway_reset,
767 .get_msglevel = usbnet_get_msglevel,
768 .set_msglevel = usbnet_set_msglevel,
769 };
770
771 /*-------------------------------------------------------------------------*/
772
773 /* work that cannot be done in interrupt context uses keventd.
774 *
775 * NOTE: with 2.5 we could do more of this using completion callbacks,
776 * especially now that control transfers can be queued.
777 */
778 static void
779 kevent (void *data)
780 {
781 struct usbnet *dev = data;
782 int status;
783
784 /* usb_clear_halt() needs a thread context */
785 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
786 unlink_urbs (dev, &dev->txq);
787 status = usb_clear_halt (dev->udev, dev->out);
788 if (status < 0
789 && status != -EPIPE
790 && status != -ESHUTDOWN) {
791 if (netif_msg_tx_err (dev))
792 deverr (dev, "can't clear tx halt, status %d",
793 status);
794 } else {
795 clear_bit (EVENT_TX_HALT, &dev->flags);
796 if (status != -ESHUTDOWN)
797 netif_wake_queue (dev->net);
798 }
799 }
800 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
801 unlink_urbs (dev, &dev->rxq);
802 status = usb_clear_halt (dev->udev, dev->in);
803 if (status < 0
804 && status != -EPIPE
805 && status != -ESHUTDOWN) {
806 if (netif_msg_rx_err (dev))
807 deverr (dev, "can't clear rx halt, status %d",
808 status);
809 } else {
810 clear_bit (EVENT_RX_HALT, &dev->flags);
811 tasklet_schedule (&dev->bh);
812 }
813 }
814
815 /* tasklet could resubmit itself forever if memory is tight */
816 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
817 struct urb *urb = NULL;
818
819 if (netif_running (dev->net))
820 urb = usb_alloc_urb (0, GFP_KERNEL);
821 else
822 clear_bit (EVENT_RX_MEMORY, &dev->flags);
823 if (urb != NULL) {
824 clear_bit (EVENT_RX_MEMORY, &dev->flags);
825 rx_submit (dev, urb, GFP_KERNEL);
826 tasklet_schedule (&dev->bh);
827 }
828 }
829
830 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
831 struct driver_info *info = dev->driver_info;
832 int retval = 0;
833
834 clear_bit (EVENT_LINK_RESET, &dev->flags);
835 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
836 devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s",
837 retval,
838 dev->udev->bus->bus_name, dev->udev->devpath,
839 info->description);
840 }
841 }
842
843 if (dev->flags)
844 devdbg (dev, "kevent done, flags = 0x%lx",
845 dev->flags);
846 }
847
848 /*-------------------------------------------------------------------------*/
849
850 static void tx_complete (struct urb *urb)
851 {
852 struct sk_buff *skb = (struct sk_buff *) urb->context;
853 struct skb_data *entry = (struct skb_data *) skb->cb;
854 struct usbnet *dev = entry->dev;
855
856 if (urb->status == 0) {
857 dev->stats.tx_packets++;
858 dev->stats.tx_bytes += entry->length;
859 } else {
860 dev->stats.tx_errors++;
861
862 switch (urb->status) {
863 case -EPIPE:
864 usbnet_defer_kevent (dev, EVENT_TX_HALT);
865 break;
866
867 /* software-driven interface shutdown */
868 case -ECONNRESET: // async unlink
869 case -ESHUTDOWN: // hardware gone
870 break;
871
872 // like rx, tx gets controller i/o faults during khubd delays
873 // and so it uses the same throttling mechanism.
874 case -EPROTO:
875 case -ETIME:
876 case -EILSEQ:
877 if (!timer_pending (&dev->delay)) {
878 mod_timer (&dev->delay,
879 jiffies + THROTTLE_JIFFIES);
880 if (netif_msg_link (dev))
881 devdbg (dev, "tx throttle %d",
882 urb->status);
883 }
884 netif_stop_queue (dev->net);
885 break;
886 default:
887 if (netif_msg_tx_err (dev))
888 devdbg (dev, "tx err %d", entry->urb->status);
889 break;
890 }
891 }
892
893 urb->dev = NULL;
894 entry->state = tx_done;
895 defer_bh(dev, skb, &dev->txq);
896 }
897
898 /*-------------------------------------------------------------------------*/
899
900 static void usbnet_tx_timeout (struct net_device *net)
901 {
902 struct usbnet *dev = netdev_priv(net);
903
904 unlink_urbs (dev, &dev->txq);
905 tasklet_schedule (&dev->bh);
906
907 // FIXME: device recovery -- reset?
908 }
909
910 /*-------------------------------------------------------------------------*/
911
912 static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net)
913 {
914 struct usbnet *dev = netdev_priv(net);
915 int length;
916 int retval = NET_XMIT_SUCCESS;
917 struct urb *urb = NULL;
918 struct skb_data *entry;
919 struct driver_info *info = dev->driver_info;
920 unsigned long flags;
921
922 // some devices want funky USB-level framing, for
923 // win32 driver (usually) and/or hardware quirks
924 if (info->tx_fixup) {
925 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
926 if (!skb) {
927 if (netif_msg_tx_err (dev))
928 devdbg (dev, "can't tx_fixup skb");
929 goto drop;
930 }
931 }
932 length = skb->len;
933
934 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
935 if (netif_msg_tx_err (dev))
936 devdbg (dev, "no urb");
937 goto drop;
938 }
939
940 entry = (struct skb_data *) skb->cb;
941 entry->urb = urb;
942 entry->dev = dev;
943 entry->state = tx_start;
944 entry->length = length;
945
946 usb_fill_bulk_urb (urb, dev->udev, dev->out,
947 skb->data, skb->len, tx_complete, skb);
948
949 /* don't assume the hardware handles USB_ZERO_PACKET
950 * NOTE: strictly conforming cdc-ether devices should expect
951 * the ZLP here, but ignore the one-byte packet.
952 *
953 * FIXME zero that byte, if it doesn't require a new skb.
954 */
955 if ((length % dev->maxpacket) == 0)
956 urb->transfer_buffer_length++;
957
958 spin_lock_irqsave (&dev->txq.lock, flags);
959
960 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
961 case -EPIPE:
962 netif_stop_queue (net);
963 usbnet_defer_kevent (dev, EVENT_TX_HALT);
964 break;
965 default:
966 if (netif_msg_tx_err (dev))
967 devdbg (dev, "tx: submit urb err %d", retval);
968 break;
969 case 0:
970 net->trans_start = jiffies;
971 __skb_queue_tail (&dev->txq, skb);
972 if (dev->txq.qlen >= TX_QLEN (dev))
973 netif_stop_queue (net);
974 }
975 spin_unlock_irqrestore (&dev->txq.lock, flags);
976
977 if (retval) {
978 if (netif_msg_tx_err (dev))
979 devdbg (dev, "drop, code %d", retval);
980 drop:
981 retval = NET_XMIT_SUCCESS;
982 dev->stats.tx_dropped++;
983 if (skb)
984 dev_kfree_skb_any (skb);
985 usb_free_urb (urb);
986 } else if (netif_msg_tx_queued (dev)) {
987 devdbg (dev, "> tx, len %d, type 0x%x",
988 length, skb->protocol);
989 }
990 return retval;
991 }
992
993
994 /*-------------------------------------------------------------------------*/
995
996 // tasklet (work deferred from completions, in_irq) or timer
997
998 static void usbnet_bh (unsigned long param)
999 {
1000 struct usbnet *dev = (struct usbnet *) param;
1001 struct sk_buff *skb;
1002 struct skb_data *entry;
1003
1004 while ((skb = skb_dequeue (&dev->done))) {
1005 entry = (struct skb_data *) skb->cb;
1006 switch (entry->state) {
1007 case rx_done:
1008 entry->state = rx_cleanup;
1009 rx_process (dev, skb);
1010 continue;
1011 case tx_done:
1012 case rx_cleanup:
1013 usb_free_urb (entry->urb);
1014 dev_kfree_skb (skb);
1015 continue;
1016 default:
1017 devdbg (dev, "bogus skb state %d", entry->state);
1018 }
1019 }
1020
1021 // waiting for all pending urbs to complete?
1022 if (dev->wait) {
1023 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1024 wake_up (dev->wait);
1025 }
1026
1027 // or are we maybe short a few urbs?
1028 } else if (netif_running (dev->net)
1029 && netif_device_present (dev->net)
1030 && !timer_pending (&dev->delay)
1031 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
1032 int temp = dev->rxq.qlen;
1033 int qlen = RX_QLEN (dev);
1034
1035 if (temp < qlen) {
1036 struct urb *urb;
1037 int i;
1038
1039 // don't refill the queue all at once
1040 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1041 urb = usb_alloc_urb (0, GFP_ATOMIC);
1042 if (urb != NULL)
1043 rx_submit (dev, urb, GFP_ATOMIC);
1044 }
1045 if (temp != dev->rxq.qlen && netif_msg_link (dev))
1046 devdbg (dev, "rxqlen %d --> %d",
1047 temp, dev->rxq.qlen);
1048 if (dev->rxq.qlen < qlen)
1049 tasklet_schedule (&dev->bh);
1050 }
1051 if (dev->txq.qlen < TX_QLEN (dev))
1052 netif_wake_queue (dev->net);
1053 }
1054 }
1055
1056
1057 \f
1058 /*-------------------------------------------------------------------------
1059 *
1060 * USB Device Driver support
1061 *
1062 *-------------------------------------------------------------------------*/
1063
1064 // precondition: never called in_interrupt
1065
1066 void usbnet_disconnect (struct usb_interface *intf)
1067 {
1068 struct usbnet *dev;
1069 struct usb_device *xdev;
1070 struct net_device *net;
1071
1072 dev = usb_get_intfdata(intf);
1073 usb_set_intfdata(intf, NULL);
1074 if (!dev)
1075 return;
1076
1077 xdev = interface_to_usbdev (intf);
1078
1079 if (netif_msg_probe (dev))
1080 devinfo (dev, "unregister '%s' usb-%s-%s, %s",
1081 intf->dev.driver->name,
1082 xdev->bus->bus_name, xdev->devpath,
1083 dev->driver_info->description);
1084
1085 net = dev->net;
1086 unregister_netdev (net);
1087
1088 /* we don't hold rtnl here ... */
1089 flush_scheduled_work ();
1090
1091 if (dev->driver_info->unbind)
1092 dev->driver_info->unbind (dev, intf);
1093
1094 free_netdev(net);
1095 usb_put_dev (xdev);
1096 }
1097 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1098
1099
1100 /*-------------------------------------------------------------------------*/
1101
1102 // precondition: never called in_interrupt
1103
1104 int
1105 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1106 {
1107 struct usbnet *dev;
1108 struct net_device *net;
1109 struct usb_host_interface *interface;
1110 struct driver_info *info;
1111 struct usb_device *xdev;
1112 int status;
1113
1114 info = (struct driver_info *) prod->driver_info;
1115 if (!info) {
1116 dev_dbg (&udev->dev, "blacklisted by %s\n", driver_name);
1117 return -ENODEV;
1118 }
1119 xdev = interface_to_usbdev (udev);
1120 interface = udev->cur_altsetting;
1121
1122 usb_get_dev (xdev);
1123
1124 status = -ENOMEM;
1125
1126 // set up our own records
1127 net = alloc_etherdev(sizeof(*dev));
1128 if (!net) {
1129 dbg ("can't kmalloc dev");
1130 goto out;
1131 }
1132
1133 dev = netdev_priv(net);
1134 dev->udev = xdev;
1135 dev->driver_info = info;
1136 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1137 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1138 skb_queue_head_init (&dev->rxq);
1139 skb_queue_head_init (&dev->txq);
1140 skb_queue_head_init (&dev->done);
1141 dev->bh.func = usbnet_bh;
1142 dev->bh.data = (unsigned long) dev;
1143 INIT_WORK (&dev->kevent, kevent, dev);
1144 dev->delay.function = usbnet_bh;
1145 dev->delay.data = (unsigned long) dev;
1146 init_timer (&dev->delay);
1147 mutex_init (&dev->phy_mutex);
1148
1149 SET_MODULE_OWNER (net);
1150 dev->net = net;
1151 strcpy (net->name, "usb%d");
1152 memcpy (net->dev_addr, node_id, sizeof node_id);
1153
1154 /* rx and tx sides can use different message sizes;
1155 * bind() should set rx_urb_size in that case.
1156 */
1157 dev->hard_mtu = net->mtu + net->hard_header_len;
1158 #if 0
1159 // dma_supported() is deeply broken on almost all architectures
1160 // possible with some EHCI controllers
1161 if (dma_supported (&udev->dev, DMA_64BIT_MASK))
1162 net->features |= NETIF_F_HIGHDMA;
1163 #endif
1164
1165 net->change_mtu = usbnet_change_mtu;
1166 net->get_stats = usbnet_get_stats;
1167 net->hard_start_xmit = usbnet_start_xmit;
1168 net->open = usbnet_open;
1169 net->stop = usbnet_stop;
1170 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1171 net->tx_timeout = usbnet_tx_timeout;
1172 net->ethtool_ops = &usbnet_ethtool_ops;
1173
1174 // allow device-specific bind/init procedures
1175 // NOTE net->name still not usable ...
1176 if (info->bind) {
1177 status = info->bind (dev, udev);
1178 // heuristic: "usb%d" for links we know are two-host,
1179 // else "eth%d" when there's reasonable doubt. userspace
1180 // can rename the link if it knows better.
1181 if ((dev->driver_info->flags & FLAG_ETHER) != 0
1182 && (net->dev_addr [0] & 0x02) == 0)
1183 strcpy (net->name, "eth%d");
1184
1185 /* maybe the remote can't receive an Ethernet MTU */
1186 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1187 net->mtu = dev->hard_mtu - net->hard_header_len;
1188 } else if (!info->in || !info->out)
1189 status = usbnet_get_endpoints (dev, udev);
1190 else {
1191 dev->in = usb_rcvbulkpipe (xdev, info->in);
1192 dev->out = usb_sndbulkpipe (xdev, info->out);
1193 if (!(info->flags & FLAG_NO_SETINT))
1194 status = usb_set_interface (xdev,
1195 interface->desc.bInterfaceNumber,
1196 interface->desc.bAlternateSetting);
1197 else
1198 status = 0;
1199
1200 }
1201 if (status == 0 && dev->status)
1202 status = init_status (dev, udev);
1203 if (status < 0)
1204 goto out1;
1205
1206 if (!dev->rx_urb_size)
1207 dev->rx_urb_size = dev->hard_mtu;
1208 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1209
1210 SET_NETDEV_DEV(net, &udev->dev);
1211 status = register_netdev (net);
1212 if (status)
1213 goto out3;
1214 if (netif_msg_probe (dev))
1215 devinfo (dev, "register '%s' at usb-%s-%s, %s, "
1216 "%02x:%02x:%02x:%02x:%02x:%02x",
1217 udev->dev.driver->name,
1218 xdev->bus->bus_name, xdev->devpath,
1219 dev->driver_info->description,
1220 net->dev_addr [0], net->dev_addr [1],
1221 net->dev_addr [2], net->dev_addr [3],
1222 net->dev_addr [4], net->dev_addr [5]);
1223
1224 // ok, it's ready to go.
1225 usb_set_intfdata (udev, dev);
1226
1227 // start as if the link is up
1228 netif_device_attach (net);
1229
1230 return 0;
1231
1232 out3:
1233 if (info->unbind)
1234 info->unbind (dev, udev);
1235 out1:
1236 free_netdev(net);
1237 out:
1238 usb_put_dev(xdev);
1239 return status;
1240 }
1241 EXPORT_SYMBOL_GPL(usbnet_probe);
1242
1243 /*-------------------------------------------------------------------------*/
1244
1245 /* FIXME these suspend/resume methods assume non-CDC style
1246 * devices, with only one interface.
1247 */
1248
1249 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1250 {
1251 struct usbnet *dev = usb_get_intfdata(intf);
1252
1253 /* accelerate emptying of the rx and queues, to avoid
1254 * having everything error out.
1255 */
1256 netif_device_detach (dev->net);
1257 (void) unlink_urbs (dev, &dev->rxq);
1258 (void) unlink_urbs (dev, &dev->txq);
1259 return 0;
1260 }
1261 EXPORT_SYMBOL_GPL(usbnet_suspend);
1262
1263 int usbnet_resume (struct usb_interface *intf)
1264 {
1265 struct usbnet *dev = usb_get_intfdata(intf);
1266
1267 netif_device_attach (dev->net);
1268 tasklet_schedule (&dev->bh);
1269 return 0;
1270 }
1271 EXPORT_SYMBOL_GPL(usbnet_resume);
1272
1273
1274 /*-------------------------------------------------------------------------*/
1275
1276 static int __init usbnet_init(void)
1277 {
1278 /* compiler should optimize this out */
1279 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1280 < sizeof (struct skb_data));
1281
1282 random_ether_addr(node_id);
1283 return 0;
1284 }
1285 module_init(usbnet_init);
1286
1287 static void __exit usbnet_exit(void)
1288 {
1289 }
1290 module_exit(usbnet_exit);
1291
1292 MODULE_AUTHOR("David Brownell");
1293 MODULE_DESCRIPTION("USB network driver framework");
1294 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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