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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[GitHub/mt8127/android_kernel_alcatel_ttab.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 (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 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
673 {
674 struct usbnet *dev = netdev_priv(net);
675
676 /* REVISIT don't always return "usbnet" */
677 strncpy (info->driver, driver_name, sizeof info->driver);
678 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
679 strncpy (info->fw_version, dev->driver_info->description,
680 sizeof info->fw_version);
681 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
682 }
683 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
684
685 static u32 usbnet_get_link (struct net_device *net)
686 {
687 struct usbnet *dev = netdev_priv(net);
688
689 /* If a check_connect is defined, return its result */
690 if (dev->driver_info->check_connect)
691 return dev->driver_info->check_connect (dev) == 0;
692
693 /* Otherwise, say we're up (to avoid breaking scripts) */
694 return 1;
695 }
696
697 u32 usbnet_get_msglevel (struct net_device *net)
698 {
699 struct usbnet *dev = netdev_priv(net);
700
701 return dev->msg_enable;
702 }
703 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
704
705 void usbnet_set_msglevel (struct net_device *net, u32 level)
706 {
707 struct usbnet *dev = netdev_priv(net);
708
709 dev->msg_enable = level;
710 }
711 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
712
713 /* drivers may override default ethtool_ops in their bind() routine */
714 static struct ethtool_ops usbnet_ethtool_ops = {
715 .get_drvinfo = usbnet_get_drvinfo,
716 .get_link = usbnet_get_link,
717 .get_msglevel = usbnet_get_msglevel,
718 .set_msglevel = usbnet_set_msglevel,
719 };
720
721 /*-------------------------------------------------------------------------*/
722
723 /* work that cannot be done in interrupt context uses keventd.
724 *
725 * NOTE: with 2.5 we could do more of this using completion callbacks,
726 * especially now that control transfers can be queued.
727 */
728 static void
729 kevent (void *data)
730 {
731 struct usbnet *dev = data;
732 int status;
733
734 /* usb_clear_halt() needs a thread context */
735 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
736 unlink_urbs (dev, &dev->txq);
737 status = usb_clear_halt (dev->udev, dev->out);
738 if (status < 0
739 && status != -EPIPE
740 && status != -ESHUTDOWN) {
741 if (netif_msg_tx_err (dev))
742 deverr (dev, "can't clear tx halt, status %d",
743 status);
744 } else {
745 clear_bit (EVENT_TX_HALT, &dev->flags);
746 if (status != -ESHUTDOWN)
747 netif_wake_queue (dev->net);
748 }
749 }
750 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
751 unlink_urbs (dev, &dev->rxq);
752 status = usb_clear_halt (dev->udev, dev->in);
753 if (status < 0
754 && status != -EPIPE
755 && status != -ESHUTDOWN) {
756 if (netif_msg_rx_err (dev))
757 deverr (dev, "can't clear rx halt, status %d",
758 status);
759 } else {
760 clear_bit (EVENT_RX_HALT, &dev->flags);
761 tasklet_schedule (&dev->bh);
762 }
763 }
764
765 /* tasklet could resubmit itself forever if memory is tight */
766 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
767 struct urb *urb = NULL;
768
769 if (netif_running (dev->net))
770 urb = usb_alloc_urb (0, GFP_KERNEL);
771 else
772 clear_bit (EVENT_RX_MEMORY, &dev->flags);
773 if (urb != NULL) {
774 clear_bit (EVENT_RX_MEMORY, &dev->flags);
775 rx_submit (dev, urb, GFP_KERNEL);
776 tasklet_schedule (&dev->bh);
777 }
778 }
779
780 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
781 struct driver_info *info = dev->driver_info;
782 int retval = 0;
783
784 clear_bit (EVENT_LINK_RESET, &dev->flags);
785 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
786 devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s",
787 retval,
788 dev->udev->bus->bus_name, dev->udev->devpath,
789 info->description);
790 }
791 }
792
793 if (dev->flags)
794 devdbg (dev, "kevent done, flags = 0x%lx",
795 dev->flags);
796 }
797
798 /*-------------------------------------------------------------------------*/
799
800 static void tx_complete (struct urb *urb)
801 {
802 struct sk_buff *skb = (struct sk_buff *) urb->context;
803 struct skb_data *entry = (struct skb_data *) skb->cb;
804 struct usbnet *dev = entry->dev;
805
806 if (urb->status == 0) {
807 dev->stats.tx_packets++;
808 dev->stats.tx_bytes += entry->length;
809 } else {
810 dev->stats.tx_errors++;
811
812 switch (urb->status) {
813 case -EPIPE:
814 usbnet_defer_kevent (dev, EVENT_TX_HALT);
815 break;
816
817 /* software-driven interface shutdown */
818 case -ECONNRESET: // async unlink
819 case -ESHUTDOWN: // hardware gone
820 break;
821
822 // like rx, tx gets controller i/o faults during khubd delays
823 // and so it uses the same throttling mechanism.
824 case -EPROTO:
825 case -ETIME:
826 case -EILSEQ:
827 if (!timer_pending (&dev->delay)) {
828 mod_timer (&dev->delay,
829 jiffies + THROTTLE_JIFFIES);
830 if (netif_msg_link (dev))
831 devdbg (dev, "tx throttle %d",
832 urb->status);
833 }
834 netif_stop_queue (dev->net);
835 break;
836 default:
837 if (netif_msg_tx_err (dev))
838 devdbg (dev, "tx err %d", entry->urb->status);
839 break;
840 }
841 }
842
843 urb->dev = NULL;
844 entry->state = tx_done;
845 defer_bh(dev, skb, &dev->txq);
846 }
847
848 /*-------------------------------------------------------------------------*/
849
850 static void usbnet_tx_timeout (struct net_device *net)
851 {
852 struct usbnet *dev = netdev_priv(net);
853
854 unlink_urbs (dev, &dev->txq);
855 tasklet_schedule (&dev->bh);
856
857 // FIXME: device recovery -- reset?
858 }
859
860 /*-------------------------------------------------------------------------*/
861
862 static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net)
863 {
864 struct usbnet *dev = netdev_priv(net);
865 int length;
866 int retval = NET_XMIT_SUCCESS;
867 struct urb *urb = NULL;
868 struct skb_data *entry;
869 struct driver_info *info = dev->driver_info;
870 unsigned long flags;
871
872 // some devices want funky USB-level framing, for
873 // win32 driver (usually) and/or hardware quirks
874 if (info->tx_fixup) {
875 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
876 if (!skb) {
877 if (netif_msg_tx_err (dev))
878 devdbg (dev, "can't tx_fixup skb");
879 goto drop;
880 }
881 }
882 length = skb->len;
883
884 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
885 if (netif_msg_tx_err (dev))
886 devdbg (dev, "no urb");
887 goto drop;
888 }
889
890 entry = (struct skb_data *) skb->cb;
891 entry->urb = urb;
892 entry->dev = dev;
893 entry->state = tx_start;
894 entry->length = length;
895
896 usb_fill_bulk_urb (urb, dev->udev, dev->out,
897 skb->data, skb->len, tx_complete, skb);
898
899 /* don't assume the hardware handles USB_ZERO_PACKET
900 * NOTE: strictly conforming cdc-ether devices should expect
901 * the ZLP here, but ignore the one-byte packet.
902 *
903 * FIXME zero that byte, if it doesn't require a new skb.
904 */
905 if ((length % dev->maxpacket) == 0)
906 urb->transfer_buffer_length++;
907
908 spin_lock_irqsave (&dev->txq.lock, flags);
909
910 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
911 case -EPIPE:
912 netif_stop_queue (net);
913 usbnet_defer_kevent (dev, EVENT_TX_HALT);
914 break;
915 default:
916 if (netif_msg_tx_err (dev))
917 devdbg (dev, "tx: submit urb err %d", retval);
918 break;
919 case 0:
920 net->trans_start = jiffies;
921 __skb_queue_tail (&dev->txq, skb);
922 if (dev->txq.qlen >= TX_QLEN (dev))
923 netif_stop_queue (net);
924 }
925 spin_unlock_irqrestore (&dev->txq.lock, flags);
926
927 if (retval) {
928 if (netif_msg_tx_err (dev))
929 devdbg (dev, "drop, code %d", retval);
930 drop:
931 retval = NET_XMIT_SUCCESS;
932 dev->stats.tx_dropped++;
933 if (skb)
934 dev_kfree_skb_any (skb);
935 usb_free_urb (urb);
936 } else if (netif_msg_tx_queued (dev)) {
937 devdbg (dev, "> tx, len %d, type 0x%x",
938 length, skb->protocol);
939 }
940 return retval;
941 }
942
943
944 /*-------------------------------------------------------------------------*/
945
946 // tasklet (work deferred from completions, in_irq) or timer
947
948 static void usbnet_bh (unsigned long param)
949 {
950 struct usbnet *dev = (struct usbnet *) param;
951 struct sk_buff *skb;
952 struct skb_data *entry;
953
954 while ((skb = skb_dequeue (&dev->done))) {
955 entry = (struct skb_data *) skb->cb;
956 switch (entry->state) {
957 case rx_done:
958 entry->state = rx_cleanup;
959 rx_process (dev, skb);
960 continue;
961 case tx_done:
962 case rx_cleanup:
963 usb_free_urb (entry->urb);
964 dev_kfree_skb (skb);
965 continue;
966 default:
967 devdbg (dev, "bogus skb state %d", entry->state);
968 }
969 }
970
971 // waiting for all pending urbs to complete?
972 if (dev->wait) {
973 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
974 wake_up (dev->wait);
975 }
976
977 // or are we maybe short a few urbs?
978 } else if (netif_running (dev->net)
979 && netif_device_present (dev->net)
980 && !timer_pending (&dev->delay)
981 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
982 int temp = dev->rxq.qlen;
983 int qlen = RX_QLEN (dev);
984
985 if (temp < qlen) {
986 struct urb *urb;
987 int i;
988
989 // don't refill the queue all at once
990 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
991 urb = usb_alloc_urb (0, GFP_ATOMIC);
992 if (urb != NULL)
993 rx_submit (dev, urb, GFP_ATOMIC);
994 }
995 if (temp != dev->rxq.qlen && netif_msg_link (dev))
996 devdbg (dev, "rxqlen %d --> %d",
997 temp, dev->rxq.qlen);
998 if (dev->rxq.qlen < qlen)
999 tasklet_schedule (&dev->bh);
1000 }
1001 if (dev->txq.qlen < TX_QLEN (dev))
1002 netif_wake_queue (dev->net);
1003 }
1004 }
1005
1006
1007 \f
1008 /*-------------------------------------------------------------------------
1009 *
1010 * USB Device Driver support
1011 *
1012 *-------------------------------------------------------------------------*/
1013
1014 // precondition: never called in_interrupt
1015
1016 void usbnet_disconnect (struct usb_interface *intf)
1017 {
1018 struct usbnet *dev;
1019 struct usb_device *xdev;
1020 struct net_device *net;
1021
1022 dev = usb_get_intfdata(intf);
1023 usb_set_intfdata(intf, NULL);
1024 if (!dev)
1025 return;
1026
1027 xdev = interface_to_usbdev (intf);
1028
1029 if (netif_msg_probe (dev))
1030 devinfo (dev, "unregister '%s' usb-%s-%s, %s",
1031 intf->dev.driver->name,
1032 xdev->bus->bus_name, xdev->devpath,
1033 dev->driver_info->description);
1034
1035 net = dev->net;
1036 unregister_netdev (net);
1037
1038 /* we don't hold rtnl here ... */
1039 flush_scheduled_work ();
1040
1041 if (dev->driver_info->unbind)
1042 dev->driver_info->unbind (dev, intf);
1043
1044 free_netdev(net);
1045 usb_put_dev (xdev);
1046 }
1047 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1048
1049
1050 /*-------------------------------------------------------------------------*/
1051
1052 // precondition: never called in_interrupt
1053
1054 int
1055 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1056 {
1057 struct usbnet *dev;
1058 struct net_device *net;
1059 struct usb_host_interface *interface;
1060 struct driver_info *info;
1061 struct usb_device *xdev;
1062 int status;
1063
1064 info = (struct driver_info *) prod->driver_info;
1065 if (!info) {
1066 dev_dbg (&udev->dev, "blacklisted by %s\n", driver_name);
1067 return -ENODEV;
1068 }
1069 xdev = interface_to_usbdev (udev);
1070 interface = udev->cur_altsetting;
1071
1072 usb_get_dev (xdev);
1073
1074 status = -ENOMEM;
1075
1076 // set up our own records
1077 net = alloc_etherdev(sizeof(*dev));
1078 if (!net) {
1079 dbg ("can't kmalloc dev");
1080 goto out;
1081 }
1082
1083 dev = netdev_priv(net);
1084 dev->udev = xdev;
1085 dev->driver_info = info;
1086 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1087 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1088 skb_queue_head_init (&dev->rxq);
1089 skb_queue_head_init (&dev->txq);
1090 skb_queue_head_init (&dev->done);
1091 dev->bh.func = usbnet_bh;
1092 dev->bh.data = (unsigned long) dev;
1093 INIT_WORK (&dev->kevent, kevent, dev);
1094 dev->delay.function = usbnet_bh;
1095 dev->delay.data = (unsigned long) dev;
1096 init_timer (&dev->delay);
1097
1098 SET_MODULE_OWNER (net);
1099 dev->net = net;
1100 strcpy (net->name, "usb%d");
1101 memcpy (net->dev_addr, node_id, sizeof node_id);
1102
1103 /* rx and tx sides can use different message sizes;
1104 * bind() should set rx_urb_size in that case.
1105 */
1106 dev->hard_mtu = net->mtu + net->hard_header_len;
1107 #if 0
1108 // dma_supported() is deeply broken on almost all architectures
1109 // possible with some EHCI controllers
1110 if (dma_supported (&udev->dev, DMA_64BIT_MASK))
1111 net->features |= NETIF_F_HIGHDMA;
1112 #endif
1113
1114 net->change_mtu = usbnet_change_mtu;
1115 net->get_stats = usbnet_get_stats;
1116 net->hard_start_xmit = usbnet_start_xmit;
1117 net->open = usbnet_open;
1118 net->stop = usbnet_stop;
1119 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1120 net->tx_timeout = usbnet_tx_timeout;
1121 net->ethtool_ops = &usbnet_ethtool_ops;
1122
1123 // allow device-specific bind/init procedures
1124 // NOTE net->name still not usable ...
1125 if (info->bind) {
1126 status = info->bind (dev, udev);
1127 // heuristic: "usb%d" for links we know are two-host,
1128 // else "eth%d" when there's reasonable doubt. userspace
1129 // can rename the link if it knows better.
1130 if ((dev->driver_info->flags & FLAG_ETHER) != 0
1131 && (net->dev_addr [0] & 0x02) == 0)
1132 strcpy (net->name, "eth%d");
1133
1134 /* maybe the remote can't receive an Ethernet MTU */
1135 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1136 net->mtu = dev->hard_mtu - net->hard_header_len;
1137 } else if (!info->in || !info->out)
1138 status = usbnet_get_endpoints (dev, udev);
1139 else {
1140 dev->in = usb_rcvbulkpipe (xdev, info->in);
1141 dev->out = usb_sndbulkpipe (xdev, info->out);
1142 if (!(info->flags & FLAG_NO_SETINT))
1143 status = usb_set_interface (xdev,
1144 interface->desc.bInterfaceNumber,
1145 interface->desc.bAlternateSetting);
1146 else
1147 status = 0;
1148
1149 }
1150 if (status == 0 && dev->status)
1151 status = init_status (dev, udev);
1152 if (status < 0)
1153 goto out1;
1154
1155 if (!dev->rx_urb_size)
1156 dev->rx_urb_size = dev->hard_mtu;
1157 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1158
1159 SET_NETDEV_DEV(net, &udev->dev);
1160 status = register_netdev (net);
1161 if (status)
1162 goto out3;
1163 if (netif_msg_probe (dev))
1164 devinfo (dev, "register '%s' at usb-%s-%s, %s, "
1165 "%02x:%02x:%02x:%02x:%02x:%02x",
1166 udev->dev.driver->name,
1167 xdev->bus->bus_name, xdev->devpath,
1168 dev->driver_info->description,
1169 net->dev_addr [0], net->dev_addr [1],
1170 net->dev_addr [2], net->dev_addr [3],
1171 net->dev_addr [4], net->dev_addr [5]);
1172
1173 // ok, it's ready to go.
1174 usb_set_intfdata (udev, dev);
1175
1176 // start as if the link is up
1177 netif_device_attach (net);
1178
1179 return 0;
1180
1181 out3:
1182 if (info->unbind)
1183 info->unbind (dev, udev);
1184 out1:
1185 free_netdev(net);
1186 out:
1187 usb_put_dev(xdev);
1188 return status;
1189 }
1190 EXPORT_SYMBOL_GPL(usbnet_probe);
1191
1192 /*-------------------------------------------------------------------------*/
1193
1194 /* FIXME these suspend/resume methods assume non-CDC style
1195 * devices, with only one interface.
1196 */
1197
1198 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1199 {
1200 struct usbnet *dev = usb_get_intfdata(intf);
1201
1202 /* accelerate emptying of the rx and queues, to avoid
1203 * having everything error out.
1204 */
1205 netif_device_detach (dev->net);
1206 (void) unlink_urbs (dev, &dev->rxq);
1207 (void) unlink_urbs (dev, &dev->txq);
1208 return 0;
1209 }
1210 EXPORT_SYMBOL_GPL(usbnet_suspend);
1211
1212 int usbnet_resume (struct usb_interface *intf)
1213 {
1214 struct usbnet *dev = usb_get_intfdata(intf);
1215
1216 netif_device_attach (dev->net);
1217 tasklet_schedule (&dev->bh);
1218 return 0;
1219 }
1220 EXPORT_SYMBOL_GPL(usbnet_resume);
1221
1222
1223 /*-------------------------------------------------------------------------*/
1224
1225 static int __init usbnet_init(void)
1226 {
1227 /* compiler should optimize this out */
1228 BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1229 < sizeof (struct skb_data));
1230
1231 random_ether_addr(node_id);
1232 return 0;
1233 }
1234 module_init(usbnet_init);
1235
1236 static void __exit usbnet_exit(void)
1237 {
1238 }
1239 module_exit(usbnet_exit);
1240
1241 MODULE_AUTHOR("David Brownell");
1242 MODULE_DESCRIPTION("USB network driver framework");
1243 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)