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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 | 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 | ||
1148 | SET_MODULE_OWNER (net); | |
1149 | dev->net = net; | |
1150 | strcpy (net->name, "usb%d"); | |
1151 | memcpy (net->dev_addr, node_id, sizeof node_id); | |
1152 | ||
1153 | /* rx and tx sides can use different message sizes; | |
1154 | * bind() should set rx_urb_size in that case. | |
1155 | */ | |
1156 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
1157 | #if 0 | |
1158 | // dma_supported() is deeply broken on almost all architectures | |
1159 | // possible with some EHCI controllers | |
1160 | if (dma_supported (&udev->dev, DMA_64BIT_MASK)) | |
1161 | net->features |= NETIF_F_HIGHDMA; | |
1162 | #endif | |
1163 | ||
1164 | net->change_mtu = usbnet_change_mtu; | |
1165 | net->get_stats = usbnet_get_stats; | |
1166 | net->hard_start_xmit = usbnet_start_xmit; | |
1167 | net->open = usbnet_open; | |
1168 | net->stop = usbnet_stop; | |
1169 | net->watchdog_timeo = TX_TIMEOUT_JIFFIES; | |
1170 | net->tx_timeout = usbnet_tx_timeout; | |
1171 | net->ethtool_ops = &usbnet_ethtool_ops; | |
1172 | ||
1173 | // allow device-specific bind/init procedures | |
1174 | // NOTE net->name still not usable ... | |
1175 | if (info->bind) { | |
1176 | status = info->bind (dev, udev); | |
1177 | // heuristic: "usb%d" for links we know are two-host, | |
1178 | // else "eth%d" when there's reasonable doubt. userspace | |
1179 | // can rename the link if it knows better. | |
1180 | if ((dev->driver_info->flags & FLAG_ETHER) != 0 | |
1181 | && (net->dev_addr [0] & 0x02) == 0) | |
1182 | strcpy (net->name, "eth%d"); | |
1183 | ||
1184 | /* maybe the remote can't receive an Ethernet MTU */ | |
1185 | if (net->mtu > (dev->hard_mtu - net->hard_header_len)) | |
1186 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
1187 | } else if (!info->in || !info->out) | |
1188 | status = usbnet_get_endpoints (dev, udev); | |
1189 | else { | |
1190 | dev->in = usb_rcvbulkpipe (xdev, info->in); | |
1191 | dev->out = usb_sndbulkpipe (xdev, info->out); | |
1192 | if (!(info->flags & FLAG_NO_SETINT)) | |
1193 | status = usb_set_interface (xdev, | |
1194 | interface->desc.bInterfaceNumber, | |
1195 | interface->desc.bAlternateSetting); | |
1196 | else | |
1197 | status = 0; | |
1198 | ||
1199 | } | |
1200 | if (status == 0 && dev->status) | |
1201 | status = init_status (dev, udev); | |
1202 | if (status < 0) | |
1203 | goto out1; | |
1204 | ||
1205 | if (!dev->rx_urb_size) | |
1206 | dev->rx_urb_size = dev->hard_mtu; | |
1207 | dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); | |
1208 | ||
1209 | SET_NETDEV_DEV(net, &udev->dev); | |
1210 | status = register_netdev (net); | |
1211 | if (status) | |
1212 | goto out3; | |
1213 | if (netif_msg_probe (dev)) | |
1214 | devinfo (dev, "register '%s' at usb-%s-%s, %s, " | |
1215 | "%02x:%02x:%02x:%02x:%02x:%02x", | |
1216 | udev->dev.driver->name, | |
1217 | xdev->bus->bus_name, xdev->devpath, | |
1218 | dev->driver_info->description, | |
1219 | net->dev_addr [0], net->dev_addr [1], | |
1220 | net->dev_addr [2], net->dev_addr [3], | |
1221 | net->dev_addr [4], net->dev_addr [5]); | |
1222 | ||
1223 | // ok, it's ready to go. | |
1224 | usb_set_intfdata (udev, dev); | |
1225 | ||
1226 | // start as if the link is up | |
1227 | netif_device_attach (net); | |
1228 | ||
1229 | return 0; | |
1230 | ||
1231 | out3: | |
1232 | if (info->unbind) | |
1233 | info->unbind (dev, udev); | |
1234 | out1: | |
1235 | free_netdev(net); | |
1236 | out: | |
1237 | usb_put_dev(xdev); | |
1238 | return status; | |
1239 | } | |
1240 | EXPORT_SYMBOL_GPL(usbnet_probe); | |
1241 | ||
1242 | /*-------------------------------------------------------------------------*/ | |
1243 | ||
1244 | /* FIXME these suspend/resume methods assume non-CDC style | |
1245 | * devices, with only one interface. | |
1246 | */ | |
1247 | ||
1248 | int usbnet_suspend (struct usb_interface *intf, pm_message_t message) | |
1249 | { | |
1250 | struct usbnet *dev = usb_get_intfdata(intf); | |
1251 | ||
1252 | /* accelerate emptying of the rx and queues, to avoid | |
1253 | * having everything error out. | |
1254 | */ | |
1255 | netif_device_detach (dev->net); | |
1256 | (void) unlink_urbs (dev, &dev->rxq); | |
1257 | (void) unlink_urbs (dev, &dev->txq); | |
1258 | return 0; | |
1259 | } | |
1260 | EXPORT_SYMBOL_GPL(usbnet_suspend); | |
1261 | ||
1262 | int usbnet_resume (struct usb_interface *intf) | |
1263 | { | |
1264 | struct usbnet *dev = usb_get_intfdata(intf); | |
1265 | ||
1266 | netif_device_attach (dev->net); | |
1267 | tasklet_schedule (&dev->bh); | |
1268 | return 0; | |
1269 | } | |
1270 | EXPORT_SYMBOL_GPL(usbnet_resume); | |
1271 | ||
1272 | ||
1273 | /*-------------------------------------------------------------------------*/ | |
1274 | ||
1275 | static int __init usbnet_init(void) | |
1276 | { | |
1277 | /* compiler should optimize this out */ | |
1278 | BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) | |
1279 | < sizeof (struct skb_data)); | |
1280 | ||
1281 | random_ether_addr(node_id); | |
1282 | return 0; | |
1283 | } | |
1284 | module_init(usbnet_init); | |
1285 | ||
1286 | static void __exit usbnet_exit(void) | |
1287 | { | |
1288 | } | |
1289 | module_exit(usbnet_exit); | |
1290 | ||
1291 | MODULE_AUTHOR("David Brownell"); | |
1292 | MODULE_DESCRIPTION("USB network driver framework"); | |
1293 | MODULE_LICENSE("GPL"); |