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Chinese: add translation of oops-tracing.txt
[pv_ops_mirror.git] / drivers / net / usb / usbnet.c
blob8ed1fc5cbc7025127ec289b494f433e6545f7ed3
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/init.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/ethtool.h>
41 #include <linux/workqueue.h>
42 #include <linux/mii.h>
43 #include <linux/usb.h>
44
45 #include "usbnet.h"
46
47 #define DRIVER_VERSION "22-Aug-2005"
48
49
50 /*-------------------------------------------------------------------------*/
51
52 /*
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).
58 *
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.
62 */
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)
68
69 // reawaken network queue this soon after stopping; else watchdog barks
70 #define TX_TIMEOUT_JIFFIES (5*HZ)
71
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)
75
76 // between wakeups
77 #define UNLINK_TIMEOUT_MS 3
78
79 /*-------------------------------------------------------------------------*/
80
81 // randomly generated ethernet address
82 static u8 node_id [ETH_ALEN];
83
84 static const char driver_name [] = "usbnet";
85
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");
90
91 /*-------------------------------------------------------------------------*/
92
93 /* handles CDC Ethernet and many other network "bulk data" interfaces */
94 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
95 {
96 int tmp;
97 struct usb_host_interface *alt = NULL;
98 struct usb_host_endpoint *in = NULL, *out = NULL;
99 struct usb_host_endpoint *status = NULL;
100
101 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
102 unsigned ep;
103
104 in = out = status = NULL;
105 alt = intf->altsetting + tmp;
106
107 /* take the first altsetting with in-bulk + out-bulk;
108 * remember any status endpoint, just in case;
109 * ignore other endpoints and altsetttings.
110 */
111 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
112 struct usb_host_endpoint *e;
113 int intr = 0;
114
115 e = alt->endpoint + ep;
116 switch (e->desc.bmAttributes) {
117 case USB_ENDPOINT_XFER_INT:
118 if (!usb_endpoint_dir_in(&e->desc))
119 continue;
120 intr = 1;
121 /* FALLTHROUGH */
122 case USB_ENDPOINT_XFER_BULK:
123 break;
124 default:
125 continue;
126 }
127 if (usb_endpoint_dir_in(&e->desc)) {
128 if (!intr && !in)
129 in = e;
130 else if (intr && !status)
131 status = e;
132 } else {
133 if (!out)
134 out = e;
135 }
136 }
137 if (in && out)
138 break;
139 }
140 if (!alt || !in || !out)
141 return -EINVAL;
142
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);
147 if (tmp < 0)
148 return tmp;
149 }
150
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;
156 return 0;
157 }
158 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
159
160 static void intr_complete (struct urb *urb);
161
162 static int init_status (struct usbnet *dev, struct usb_interface *intf)
163 {
164 char *buf = NULL;
165 unsigned pipe = 0;
166 unsigned maxp;
167 unsigned period;
168
169 if (!dev->driver_info->status)
170 return 0;
171
172 pipe = usb_rcvintpipe (dev->udev,
173 dev->status->desc.bEndpointAddress
174 & USB_ENDPOINT_NUMBER_MASK);
175 maxp = usb_maxpacket (dev->udev, pipe, 0);
176
177 /* avoid 1 msec chatter: min 8 msec poll rate */
178 period = max ((int) dev->status->desc.bInterval,
179 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
180
181 buf = kmalloc (maxp, GFP_KERNEL);
182 if (buf) {
183 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
184 if (!dev->interrupt) {
185 kfree (buf);
186 return -ENOMEM;
187 } else {
188 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
189 buf, maxp, intr_complete, dev, period);
190 dev_dbg(&intf->dev,
191 "status ep%din, %d bytes period %d\n",
192 usb_pipeendpoint(pipe), maxp, period);
193 }
194 }
195 return 0;
196 }
197
198 /* Passes this packet up the stack, updating its accounting.
199 * Some link protocols batch packets, so their rx_fixup paths
200 * can return clones as well as just modify the original skb.
201 */
202 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
203 {
204 int status;
205
206 skb->protocol = eth_type_trans (skb, dev->net);
207 dev->stats.rx_packets++;
208 dev->stats.rx_bytes += skb->len;
209
210 if (netif_msg_rx_status (dev))
211 devdbg (dev, "< rx, len %zu, type 0x%x",
212 skb->len + sizeof (struct ethhdr), skb->protocol);
213 memset (skb->cb, 0, sizeof (struct skb_data));
214 status = netif_rx (skb);
215 if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev))
216 devdbg (dev, "netif_rx status %d", status);
217 }
218 EXPORT_SYMBOL_GPL(usbnet_skb_return);
219
220 \f
221 /*-------------------------------------------------------------------------
222 *
223 * Network Device Driver (peer link to "Host Device", from USB host)
224 *
225 *-------------------------------------------------------------------------*/
226
227 static int usbnet_change_mtu (struct net_device *net, int new_mtu)
228 {
229 struct usbnet *dev = netdev_priv(net);
230 int ll_mtu = new_mtu + net->hard_header_len;
231 int old_hard_mtu = dev->hard_mtu;
232 int old_rx_urb_size = dev->rx_urb_size;
233
234 if (new_mtu <= 0)
235 return -EINVAL;
236 // no second zero-length packet read wanted after mtu-sized packets
237 if ((ll_mtu % dev->maxpacket) == 0)
238 return -EDOM;
239 net->mtu = new_mtu;
240
241 dev->hard_mtu = net->mtu + net->hard_header_len;
242 if (dev->rx_urb_size == old_hard_mtu) {
243 dev->rx_urb_size = dev->hard_mtu;
244 if (dev->rx_urb_size > old_rx_urb_size)
245 usbnet_unlink_rx_urbs(dev);
246 }
247
248 return 0;
249 }
250
251 /*-------------------------------------------------------------------------*/
252
253 static struct net_device_stats *usbnet_get_stats (struct net_device *net)
254 {
255 struct usbnet *dev = netdev_priv(net);
256 return &dev->stats;
257 }
258
259 /*-------------------------------------------------------------------------*/
260
261 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
262 * completion callbacks. 2.5 should have fixed those bugs...
263 */
264
265 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
266 {
267 unsigned long flags;
268
269 spin_lock_irqsave(&list->lock, flags);
270 __skb_unlink(skb, list);
271 spin_unlock(&list->lock);
272 spin_lock(&dev->done.lock);
273 __skb_queue_tail(&dev->done, skb);
274 if (dev->done.qlen == 1)
275 tasklet_schedule(&dev->bh);
276 spin_unlock_irqrestore(&dev->done.lock, flags);
277 }
278
279 /* some work can't be done in tasklets, so we use keventd
280 *
281 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
282 * but tasklet_schedule() doesn't. hope the failure is rare.
283 */
284 void usbnet_defer_kevent (struct usbnet *dev, int work)
285 {
286 set_bit (work, &dev->flags);
287 if (!schedule_work (&dev->kevent))
288 deverr (dev, "kevent %d may have been dropped", work);
289 else
290 devdbg (dev, "kevent %d scheduled", work);
291 }
292 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
293
294 /*-------------------------------------------------------------------------*/
295
296 static void rx_complete (struct urb *urb);
297
298 static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
299 {
300 struct sk_buff *skb;
301 struct skb_data *entry;
302 int retval = 0;
303 unsigned long lockflags;
304 size_t size = dev->rx_urb_size;
305
306 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
307 if (netif_msg_rx_err (dev))
308 devdbg (dev, "no rx skb");
309 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
310 usb_free_urb (urb);
311 return;
312 }
313 skb_reserve (skb, NET_IP_ALIGN);
314
315 entry = (struct skb_data *) skb->cb;
316 entry->urb = urb;
317 entry->dev = dev;
318 entry->state = rx_start;
319 entry->length = 0;
320
321 usb_fill_bulk_urb (urb, dev->udev, dev->in,
322 skb->data, size, rx_complete, skb);
323
324 spin_lock_irqsave (&dev->rxq.lock, lockflags);
325
326 if (netif_running (dev->net)
327 && netif_device_present (dev->net)
328 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
329 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
330 case -EPIPE:
331 usbnet_defer_kevent (dev, EVENT_RX_HALT);
332 break;
333 case -ENOMEM:
334 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
335 break;
336 case -ENODEV:
337 if (netif_msg_ifdown (dev))
338 devdbg (dev, "device gone");
339 netif_device_detach (dev->net);
340 break;
341 default:
342 if (netif_msg_rx_err (dev))
343 devdbg (dev, "rx submit, %d", retval);
344 tasklet_schedule (&dev->bh);
345 break;
346 case 0:
347 __skb_queue_tail (&dev->rxq, skb);
348 }
349 } else {
350 if (netif_msg_ifdown (dev))
351 devdbg (dev, "rx: stopped");
352 retval = -ENOLINK;
353 }
354 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
355 if (retval) {
356 dev_kfree_skb_any (skb);
357 usb_free_urb (urb);
358 }
359 }
360
361
362 /*-------------------------------------------------------------------------*/
363
364 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
365 {
366 if (dev->driver_info->rx_fixup
367 && !dev->driver_info->rx_fixup (dev, skb))
368 goto error;
369 // else network stack removes extra byte if we forced a short packet
370
371 if (skb->len)
372 usbnet_skb_return (dev, skb);
373 else {
374 if (netif_msg_rx_err (dev))
375 devdbg (dev, "drop");
376 error:
377 dev->stats.rx_errors++;
378 skb_queue_tail (&dev->done, skb);
379 }
380 }
381
382 /*-------------------------------------------------------------------------*/
383
384 static void rx_complete (struct urb *urb)
385 {
386 struct sk_buff *skb = (struct sk_buff *) urb->context;
387 struct skb_data *entry = (struct skb_data *) skb->cb;
388 struct usbnet *dev = entry->dev;
389 int urb_status = urb->status;
390
391 skb_put (skb, urb->actual_length);
392 entry->state = rx_done;
393 entry->urb = NULL;
394
395 switch (urb_status) {
396 /* success */
397 case 0:
398 if (skb->len < dev->net->hard_header_len) {
399 entry->state = rx_cleanup;
400 dev->stats.rx_errors++;
401 dev->stats.rx_length_errors++;
402 if (netif_msg_rx_err (dev))
403 devdbg (dev, "rx length %d", skb->len);
404 }
405 break;
406
407 /* stalls need manual reset. this is rare ... except that
408 * when going through USB 2.0 TTs, unplug appears this way.
409 * we avoid the highspeed version of the ETIMEOUT/EILSEQ
410 * storm, recovering as needed.
411 */
412 case -EPIPE:
413 dev->stats.rx_errors++;
414 usbnet_defer_kevent (dev, EVENT_RX_HALT);
415 // FALLTHROUGH
416
417 /* software-driven interface shutdown */
418 case -ECONNRESET: /* async unlink */
419 case -ESHUTDOWN: /* hardware gone */
420 if (netif_msg_ifdown (dev))
421 devdbg (dev, "rx shutdown, code %d", urb_status);
422 goto block;
423
424 /* we get controller i/o faults during khubd disconnect() delays.
425 * throttle down resubmits, to avoid log floods; just temporarily,
426 * so we still recover when the fault isn't a khubd delay.
427 */
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 usb_autopm_put_interface(dev->intf);
594
595 return 0;
596 }
597
598 /*-------------------------------------------------------------------------*/
599
600 // posts reads, and enables write queuing
601
602 // precondition: never called in_interrupt
603
604 static int usbnet_open (struct net_device *net)
605 {
606 struct usbnet *dev = netdev_priv(net);
607 int retval;
608 struct driver_info *info = dev->driver_info;
609
610 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
611 if (netif_msg_ifup (dev))
612 devinfo (dev,
613 "resumption fail (%d) usbnet usb-%s-%s, %s",
614 retval,
615 dev->udev->bus->bus_name, dev->udev->devpath,
616 info->description);
617 goto done_nopm;
618 }
619
620 // put into "known safe" state
621 if (info->reset && (retval = info->reset (dev)) < 0) {
622 if (netif_msg_ifup (dev))
623 devinfo (dev,
624 "open reset fail (%d) usbnet usb-%s-%s, %s",
625 retval,
626 dev->udev->bus->bus_name, dev->udev->devpath,
627 info->description);
628 goto done;
629 }
630
631 // insist peer be connected
632 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
633 if (netif_msg_ifup (dev))
634 devdbg (dev, "can't open; %d", retval);
635 goto done;
636 }
637
638 /* start any status interrupt transfer */
639 if (dev->interrupt) {
640 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
641 if (retval < 0) {
642 if (netif_msg_ifup (dev))
643 deverr (dev, "intr submit %d", retval);
644 goto done;
645 }
646 }
647
648 netif_start_queue (net);
649 if (netif_msg_ifup (dev)) {
650 char *framing;
651
652 if (dev->driver_info->flags & FLAG_FRAMING_NC)
653 framing = "NetChip";
654 else if (dev->driver_info->flags & FLAG_FRAMING_GL)
655 framing = "GeneSys";
656 else if (dev->driver_info->flags & FLAG_FRAMING_Z)
657 framing = "Zaurus";
658 else if (dev->driver_info->flags & FLAG_FRAMING_RN)
659 framing = "RNDIS";
660 else if (dev->driver_info->flags & FLAG_FRAMING_AX)
661 framing = "ASIX";
662 else
663 framing = "simple";
664
665 devinfo (dev, "open: enable queueing "
666 "(rx %d, tx %d) mtu %d %s framing",
667 (int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu,
668 framing);
669 }
670
671 // delay posting reads until we're fully open
672 tasklet_schedule (&dev->bh);
673 return retval;
674 done:
675 usb_autopm_put_interface(dev->intf);
676 done_nopm:
677 return retval;
678 }
679
680 /*-------------------------------------------------------------------------*/
681
682 /* ethtool methods; minidrivers may need to add some more, but
683 * they'll probably want to use this base set.
684 */
685
686 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
687 {
688 struct usbnet *dev = netdev_priv(net);
689
690 if (!dev->mii.mdio_read)
691 return -EOPNOTSUPP;
692
693 return mii_ethtool_gset(&dev->mii, cmd);
694 }
695 EXPORT_SYMBOL_GPL(usbnet_get_settings);
696
697 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
698 {
699 struct usbnet *dev = netdev_priv(net);
700 int retval;
701
702 if (!dev->mii.mdio_write)
703 return -EOPNOTSUPP;
704
705 retval = mii_ethtool_sset(&dev->mii, cmd);
706
707 /* link speed/duplex might have changed */
708 if (dev->driver_info->link_reset)
709 dev->driver_info->link_reset(dev);
710
711 return retval;
712
713 }
714 EXPORT_SYMBOL_GPL(usbnet_set_settings);
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 int usbnet_nway_reset(struct net_device *net)
734 {
735 struct usbnet *dev = netdev_priv(net);
736
737 if (!dev->mii.mdio_write)
738 return -EOPNOTSUPP;
739
740 return mii_nway_restart(&dev->mii);
741 }
742 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
743
744 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
745 {
746 struct usbnet *dev = netdev_priv(net);
747
748 strncpy (info->driver, dev->driver_name, sizeof info->driver);
749 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
750 strncpy (info->fw_version, dev->driver_info->description,
751 sizeof info->fw_version);
752 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
753 }
754 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
755
756 u32 usbnet_get_msglevel (struct net_device *net)
757 {
758 struct usbnet *dev = netdev_priv(net);
759
760 return dev->msg_enable;
761 }
762 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
763
764 void usbnet_set_msglevel (struct net_device *net, u32 level)
765 {
766 struct usbnet *dev = netdev_priv(net);
767
768 dev->msg_enable = level;
769 }
770 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
771
772 /* drivers may override default ethtool_ops in their bind() routine */
773 static struct ethtool_ops usbnet_ethtool_ops = {
774 .get_settings = usbnet_get_settings,
775 .set_settings = usbnet_set_settings,
776 .get_link = usbnet_get_link,
777 .nway_reset = usbnet_nway_reset,
778 .get_drvinfo = usbnet_get_drvinfo,
779 .get_msglevel = usbnet_get_msglevel,
780 .set_msglevel = usbnet_set_msglevel,
781 };
782
783 /*-------------------------------------------------------------------------*/
784
785 /* work that cannot be done in interrupt context uses keventd.
786 *
787 * NOTE: with 2.5 we could do more of this using completion callbacks,
788 * especially now that control transfers can be queued.
789 */
790 static void
791 kevent (struct work_struct *work)
792 {
793 struct usbnet *dev =
794 container_of(work, struct usbnet, kevent);
795 int status;
796
797 /* usb_clear_halt() needs a thread context */
798 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
799 unlink_urbs (dev, &dev->txq);
800 status = usb_clear_halt (dev->udev, dev->out);
801 if (status < 0
802 && status != -EPIPE
803 && status != -ESHUTDOWN) {
804 if (netif_msg_tx_err (dev))
805 deverr (dev, "can't clear tx halt, status %d",
806 status);
807 } else {
808 clear_bit (EVENT_TX_HALT, &dev->flags);
809 if (status != -ESHUTDOWN)
810 netif_wake_queue (dev->net);
811 }
812 }
813 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
814 unlink_urbs (dev, &dev->rxq);
815 status = usb_clear_halt (dev->udev, dev->in);
816 if (status < 0
817 && status != -EPIPE
818 && status != -ESHUTDOWN) {
819 if (netif_msg_rx_err (dev))
820 deverr (dev, "can't clear rx halt, status %d",
821 status);
822 } else {
823 clear_bit (EVENT_RX_HALT, &dev->flags);
824 tasklet_schedule (&dev->bh);
825 }
826 }
827
828 /* tasklet could resubmit itself forever if memory is tight */
829 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
830 struct urb *urb = NULL;
831
832 if (netif_running (dev->net))
833 urb = usb_alloc_urb (0, GFP_KERNEL);
834 else
835 clear_bit (EVENT_RX_MEMORY, &dev->flags);
836 if (urb != NULL) {
837 clear_bit (EVENT_RX_MEMORY, &dev->flags);
838 rx_submit (dev, urb, GFP_KERNEL);
839 tasklet_schedule (&dev->bh);
840 }
841 }
842
843 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
844 struct driver_info *info = dev->driver_info;
845 int retval = 0;
846
847 clear_bit (EVENT_LINK_RESET, &dev->flags);
848 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
849 devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s",
850 retval,
851 dev->udev->bus->bus_name, dev->udev->devpath,
852 info->description);
853 }
854 }
855
856 if (dev->flags)
857 devdbg (dev, "kevent done, flags = 0x%lx",
858 dev->flags);
859 }
860
861 /*-------------------------------------------------------------------------*/
862
863 static void tx_complete (struct urb *urb)
864 {
865 struct sk_buff *skb = (struct sk_buff *) urb->context;
866 struct skb_data *entry = (struct skb_data *) skb->cb;
867 struct usbnet *dev = entry->dev;
868
869 if (urb->status == 0) {
870 dev->stats.tx_packets++;
871 dev->stats.tx_bytes += entry->length;
872 } else {
873 dev->stats.tx_errors++;
874
875 switch (urb->status) {
876 case -EPIPE:
877 usbnet_defer_kevent (dev, EVENT_TX_HALT);
878 break;
879
880 /* software-driven interface shutdown */
881 case -ECONNRESET: // async unlink
882 case -ESHUTDOWN: // hardware gone
883 break;
884
885 // like rx, tx gets controller i/o faults during khubd delays
886 // and so it uses the same throttling mechanism.
887 case -EPROTO:
888 case -ETIME:
889 case -EILSEQ:
890 if (!timer_pending (&dev->delay)) {
891 mod_timer (&dev->delay,
892 jiffies + THROTTLE_JIFFIES);
893 if (netif_msg_link (dev))
894 devdbg (dev, "tx throttle %d",
895 urb->status);
896 }
897 netif_stop_queue (dev->net);
898 break;
899 default:
900 if (netif_msg_tx_err (dev))
901 devdbg (dev, "tx err %d", entry->urb->status);
902 break;
903 }
904 }
905
906 urb->dev = NULL;
907 entry->state = tx_done;
908 defer_bh(dev, skb, &dev->txq);
909 }
910
911 /*-------------------------------------------------------------------------*/
912
913 static void usbnet_tx_timeout (struct net_device *net)
914 {
915 struct usbnet *dev = netdev_priv(net);
916
917 unlink_urbs (dev, &dev->txq);
918 tasklet_schedule (&dev->bh);
919
920 // FIXME: device recovery -- reset?
921 }
922
923 /*-------------------------------------------------------------------------*/
924
925 static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net)
926 {
927 struct usbnet *dev = netdev_priv(net);
928 int length;
929 int retval = NET_XMIT_SUCCESS;
930 struct urb *urb = NULL;
931 struct skb_data *entry;
932 struct driver_info *info = dev->driver_info;
933 unsigned long flags;
934
935 // some devices want funky USB-level framing, for
936 // win32 driver (usually) and/or hardware quirks
937 if (info->tx_fixup) {
938 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
939 if (!skb) {
940 if (netif_msg_tx_err (dev))
941 devdbg (dev, "can't tx_fixup skb");
942 goto drop;
943 }
944 }
945 length = skb->len;
946
947 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
948 if (netif_msg_tx_err (dev))
949 devdbg (dev, "no urb");
950 goto drop;
951 }
952
953 entry = (struct skb_data *) skb->cb;
954 entry->urb = urb;
955 entry->dev = dev;
956 entry->state = tx_start;
957 entry->length = length;
958
959 usb_fill_bulk_urb (urb, dev->udev, dev->out,
960 skb->data, skb->len, tx_complete, skb);
961
962 /* don't assume the hardware handles USB_ZERO_PACKET
963 * NOTE: strictly conforming cdc-ether devices should expect
964 * the ZLP here, but ignore the one-byte packet.
965 */
966 if ((length % dev->maxpacket) == 0) {
967 urb->transfer_buffer_length++;
968 if (skb_tailroom(skb)) {
969 skb->data[skb->len] = 0;
970 __skb_put(skb, 1);
971 }
972 }
973
974 spin_lock_irqsave (&dev->txq.lock, flags);
975
976 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
977 case -EPIPE:
978 netif_stop_queue (net);
979 usbnet_defer_kevent (dev, EVENT_TX_HALT);
980 break;
981 default:
982 if (netif_msg_tx_err (dev))
983 devdbg (dev, "tx: submit urb err %d", retval);
984 break;
985 case 0:
986 net->trans_start = jiffies;
987 __skb_queue_tail (&dev->txq, skb);
988 if (dev->txq.qlen >= TX_QLEN (dev))
989 netif_stop_queue (net);
990 }
991 spin_unlock_irqrestore (&dev->txq.lock, flags);
992
993 if (retval) {
994 if (netif_msg_tx_err (dev))
995 devdbg (dev, "drop, code %d", retval);
996 drop:
997 retval = NET_XMIT_SUCCESS;
998 dev->stats.tx_dropped++;
999 if (skb)
1000 dev_kfree_skb_any (skb);
1001 usb_free_urb (urb);
1002 } else if (netif_msg_tx_queued (dev)) {
1003 devdbg (dev, "> tx, len %d, type 0x%x",
1004 length, skb->protocol);
1005 }
1006 return retval;
1007 }
1008
1009
1010 /*-------------------------------------------------------------------------*/
1011
1012 // tasklet (work deferred from completions, in_irq) or timer
1013
1014 static void usbnet_bh (unsigned long param)
1015 {
1016 struct usbnet *dev = (struct usbnet *) param;
1017 struct sk_buff *skb;
1018 struct skb_data *entry;
1019
1020 while ((skb = skb_dequeue (&dev->done))) {
1021 entry = (struct skb_data *) skb->cb;
1022 switch (entry->state) {
1023 case rx_done:
1024 entry->state = rx_cleanup;
1025 rx_process (dev, skb);
1026 continue;
1027 case tx_done:
1028 case rx_cleanup:
1029 usb_free_urb (entry->urb);
1030 dev_kfree_skb (skb);
1031 continue;
1032 default:
1033 devdbg (dev, "bogus skb state %d", entry->state);
1034 }
1035 }
1036
1037 // waiting for all pending urbs to complete?
1038 if (dev->wait) {
1039 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1040 wake_up (dev->wait);
1041 }
1042
1043 // or are we maybe short a few urbs?
1044 } else if (netif_running (dev->net)
1045 && netif_device_present (dev->net)
1046 && !timer_pending (&dev->delay)
1047 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
1048 int temp = dev->rxq.qlen;
1049 int qlen = RX_QLEN (dev);
1050
1051 if (temp < qlen) {
1052 struct urb *urb;
1053 int i;
1054
1055 // don't refill the queue all at once
1056 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1057 urb = usb_alloc_urb (0, GFP_ATOMIC);
1058 if (urb != NULL)
1059 rx_submit (dev, urb, GFP_ATOMIC);
1060 }
1061 if (temp != dev->rxq.qlen && netif_msg_link (dev))
1062 devdbg (dev, "rxqlen %d --> %d",
1063 temp, dev->rxq.qlen);
1064 if (dev->rxq.qlen < qlen)
1065 tasklet_schedule (&dev->bh);
1066 }
1067 if (dev->txq.qlen < TX_QLEN (dev))
1068 netif_wake_queue (dev->net);
1069 }
1070 }
1071
1072
1073 \f
1074 /*-------------------------------------------------------------------------
1075 *
1076 * USB Device Driver support
1077 *
1078 *-------------------------------------------------------------------------*/
1079
1080 // precondition: never called in_interrupt
1081
1082 void usbnet_disconnect (struct usb_interface *intf)
1083 {
1084 struct usbnet *dev;
1085 struct usb_device *xdev;
1086 struct net_device *net;
1087
1088 dev = usb_get_intfdata(intf);
1089 usb_set_intfdata(intf, NULL);
1090 if (!dev)
1091 return;
1092
1093 xdev = interface_to_usbdev (intf);
1094
1095 if (netif_msg_probe (dev))
1096 devinfo (dev, "unregister '%s' usb-%s-%s, %s",
1097 intf->dev.driver->name,
1098 xdev->bus->bus_name, xdev->devpath,
1099 dev->driver_info->description);
1100
1101 net = dev->net;
1102 unregister_netdev (net);
1103
1104 /* we don't hold rtnl here ... */
1105 flush_scheduled_work ();
1106
1107 if (dev->driver_info->unbind)
1108 dev->driver_info->unbind (dev, intf);
1109
1110 free_netdev(net);
1111 usb_put_dev (xdev);
1112 }
1113 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1114
1115
1116 /*-------------------------------------------------------------------------*/
1117
1118 // precondition: never called in_interrupt
1119
1120 int
1121 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1122 {
1123 struct usbnet *dev;
1124 struct net_device *net;
1125 struct usb_host_interface *interface;
1126 struct driver_info *info;
1127 struct usb_device *xdev;
1128 int status;
1129 const char *name;
1130 DECLARE_MAC_BUF(mac);
1131
1132 name = udev->dev.driver->name;
1133 info = (struct driver_info *) prod->driver_info;
1134 if (!info) {
1135 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1136 return -ENODEV;
1137 }
1138 xdev = interface_to_usbdev (udev);
1139 interface = udev->cur_altsetting;
1140
1141 usb_get_dev (xdev);
1142
1143 status = -ENOMEM;
1144
1145 // set up our own records
1146 net = alloc_etherdev(sizeof(*dev));
1147 if (!net) {
1148 dbg ("can't kmalloc dev");
1149 goto out;
1150 }
1151
1152 dev = netdev_priv(net);
1153 dev->udev = xdev;
1154 dev->intf = udev;
1155 dev->driver_info = info;
1156 dev->driver_name = name;
1157 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1158 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1159 skb_queue_head_init (&dev->rxq);
1160 skb_queue_head_init (&dev->txq);
1161 skb_queue_head_init (&dev->done);
1162 dev->bh.func = usbnet_bh;
1163 dev->bh.data = (unsigned long) dev;
1164 INIT_WORK (&dev->kevent, kevent);
1165 dev->delay.function = usbnet_bh;
1166 dev->delay.data = (unsigned long) dev;
1167 init_timer (&dev->delay);
1168 mutex_init (&dev->phy_mutex);
1169
1170 dev->net = net;
1171 strcpy (net->name, "usb%d");
1172 memcpy (net->dev_addr, node_id, sizeof node_id);
1173
1174 /* rx and tx sides can use different message sizes;
1175 * bind() should set rx_urb_size in that case.
1176 */
1177 dev->hard_mtu = net->mtu + net->hard_header_len;
1178 #if 0
1179 // dma_supported() is deeply broken on almost all architectures
1180 // possible with some EHCI controllers
1181 if (dma_supported (&udev->dev, DMA_64BIT_MASK))
1182 net->features |= NETIF_F_HIGHDMA;
1183 #endif
1184
1185 net->change_mtu = usbnet_change_mtu;
1186 net->get_stats = usbnet_get_stats;
1187 net->hard_start_xmit = usbnet_start_xmit;
1188 net->open = usbnet_open;
1189 net->stop = usbnet_stop;
1190 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1191 net->tx_timeout = usbnet_tx_timeout;
1192 net->ethtool_ops = &usbnet_ethtool_ops;
1193
1194 // allow device-specific bind/init procedures
1195 // NOTE net->name still not usable ...
1196 if (info->bind) {
1197 status = info->bind (dev, udev);
1198 if (status < 0)
1199 goto out1;
1200
1201 // heuristic: "usb%d" for links we know are two-host,
1202 // else "eth%d" when there's reasonable doubt. userspace
1203 // can rename the link if it knows better.
1204 if ((dev->driver_info->flags & FLAG_ETHER) != 0
1205 && (net->dev_addr [0] & 0x02) == 0)
1206 strcpy (net->name, "eth%d");
1207
1208 /* maybe the remote can't receive an Ethernet MTU */
1209 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1210 net->mtu = dev->hard_mtu - net->hard_header_len;
1211 } else if (!info->in || !info->out)
1212 status = usbnet_get_endpoints (dev, udev);
1213 else {
1214 dev->in = usb_rcvbulkpipe (xdev, info->in);
1215 dev->out = usb_sndbulkpipe (xdev, info->out);
1216 if (!(info->flags & FLAG_NO_SETINT))
1217 status = usb_set_interface (xdev,
1218 interface->desc.bInterfaceNumber,
1219 interface->desc.bAlternateSetting);
1220 else
1221 status = 0;
1222
1223 }
1224 if (status >= 0 && dev->status)
1225 status = init_status (dev, udev);
1226 if (status < 0)
1227 goto out3;
1228
1229 if (!dev->rx_urb_size)
1230 dev->rx_urb_size = dev->hard_mtu;
1231 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1232
1233 SET_NETDEV_DEV(net, &udev->dev);
1234 status = register_netdev (net);
1235 if (status)
1236 goto out3;
1237 if (netif_msg_probe (dev))
1238 devinfo (dev, "register '%s' at usb-%s-%s, %s, %s",
1239 udev->dev.driver->name,
1240 xdev->bus->bus_name, xdev->devpath,
1241 dev->driver_info->description,
1242 print_mac(mac, net->dev_addr));
1243
1244 // ok, it's ready to go.
1245 usb_set_intfdata (udev, dev);
1246
1247 // start as if the link is up
1248 netif_device_attach (net);
1249
1250 return 0;
1251
1252 out3:
1253 if (info->unbind)
1254 info->unbind (dev, udev);
1255 out1:
1256 free_netdev(net);
1257 out:
1258 usb_put_dev(xdev);
1259 return status;
1260 }
1261 EXPORT_SYMBOL_GPL(usbnet_probe);
1262
1263 /*-------------------------------------------------------------------------*/
1264
1265 /*
1266 * suspend the whole driver as soon as the first interface is suspended
1267 * resume only when the last interface is resumed
1268 */
1269
1270 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1271 {
1272 struct usbnet *dev = usb_get_intfdata(intf);
1273
1274 if (!dev->suspend_count++) {
1275 /*
1276 * accelerate emptying of the rx and queues, to avoid
1277 * having everything error out.
1278 */
1279 netif_device_detach (dev->net);
1280 (void) unlink_urbs (dev, &dev->rxq);
1281 (void) unlink_urbs (dev, &dev->txq);
1282 /*
1283 * reattach so runtime management can use and
1284 * wake the device
1285 */
1286 netif_device_attach (dev->net);
1287 }
1288 return 0;
1289 }
1290 EXPORT_SYMBOL_GPL(usbnet_suspend);
1291
1292 int usbnet_resume (struct usb_interface *intf)
1293 {
1294 struct usbnet *dev = usb_get_intfdata(intf);
1295
1296 if (!--dev->suspend_count)
1297 tasklet_schedule (&dev->bh);
1298
1299 return 0;
1300 }
1301 EXPORT_SYMBOL_GPL(usbnet_resume);
1302
1303
1304 /*-------------------------------------------------------------------------*/
1305
1306 static int __init usbnet_init(void)
1307 {
1308 /* compiler should optimize this out */
1309 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1310 < sizeof (struct skb_data));
1311
1312 random_ether_addr(node_id);
1313 return 0;
1314 }
1315 module_init(usbnet_init);
1316
1317 static void __exit usbnet_exit(void)
1318 {
1319 }
1320 module_exit(usbnet_exit);
1321
1322 MODULE_AUTHOR("David Brownell");
1323 MODULE_DESCRIPTION("USB network driver framework");
1324 MODULE_LICENSE("GPL");
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