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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, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | /* | |
21 | * This is a generic "USB networking" framework that works with several | |
22 | * kinds of full and high speed networking devices: host-to-host cables, | |
23 | * smart usb peripherals, and actual Ethernet adapters. | |
24 | * | |
25 | * These devices usually differ in terms of control protocols (if they | |
26 | * even have one!) and sometimes they define new framing to wrap or batch | |
27 | * Ethernet packets. Otherwise, they talk to USB pretty much the same, | |
28 | * so interface (un)binding, endpoint I/O queues, fault handling, and other | |
29 | * issues can usefully be addressed by this framework. | |
30 | */ | |
31 | ||
32 | // #define DEBUG // error path messages, extra info | |
33 | // #define VERBOSE // more; success messages | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/etherdevice.h> | |
39 | #include <linux/ctype.h> | |
40 | #include <linux/ethtool.h> | |
41 | #include <linux/workqueue.h> | |
42 | #include <linux/mii.h> | |
43 | #include <linux/usb.h> | |
44 | #include <linux/usb/usbnet.h> | |
45 | #include <linux/slab.h> | |
46 | #include <linux/kernel.h> | |
47 | #include <linux/pm_runtime.h> | |
48 | ||
49 | #define DRIVER_VERSION "22-Aug-2005" | |
50 | ||
51 | ||
52 | /*-------------------------------------------------------------------------*/ | |
53 | ||
54 | /* | |
55 | * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. | |
56 | * Several dozen bytes of IPv4 data can fit in two such transactions. | |
57 | * One maximum size Ethernet packet takes twenty four of them. | |
58 | * For high speed, each frame comfortably fits almost 36 max size | |
59 | * Ethernet packets (so queues should be bigger). | |
60 | * | |
61 | * The goal is to let the USB host controller be busy for 5msec or | |
62 | * more before an irq is required, under load. Jumbograms change | |
63 | * the equation. | |
64 | */ | |
65 | #define MAX_QUEUE_MEMORY (60 * 1518) | |
66 | #define RX_QLEN(dev) ((dev)->rx_qlen) | |
67 | #define TX_QLEN(dev) ((dev)->tx_qlen) | |
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 hub_wq might disconnect() | |
73 | * us (it polls at HZ/4 usually) before we report too many false errors. | |
74 | */ | |
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 altsettings. | |
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 (!usb_endpoint_dir_in(&e->desc)) | |
120 | continue; | |
121 | intr = 1; | |
122 | /* FALLTHROUGH */ | |
123 | case USB_ENDPOINT_XFER_BULK: | |
124 | break; | |
125 | default: | |
126 | continue; | |
127 | } | |
128 | if (usb_endpoint_dir_in(&e->desc)) { | |
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 | int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) | |
162 | { | |
163 | int tmp = -1, ret; | |
164 | unsigned char buf [13]; | |
165 | ||
166 | ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); | |
167 | if (ret == 12) | |
168 | tmp = hex2bin(dev->net->dev_addr, buf, 6); | |
169 | if (tmp < 0) { | |
170 | dev_dbg(&dev->udev->dev, | |
171 | "bad MAC string %d fetch, %d\n", iMACAddress, tmp); | |
172 | if (ret >= 0) | |
173 | ret = -EINVAL; | |
174 | return ret; | |
175 | } | |
176 | return 0; | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); | |
179 | ||
180 | static void intr_complete (struct urb *urb) | |
181 | { | |
182 | struct usbnet *dev = urb->context; | |
183 | int status = urb->status; | |
184 | ||
185 | switch (status) { | |
186 | /* success */ | |
187 | case 0: | |
188 | dev->driver_info->status(dev, urb); | |
189 | break; | |
190 | ||
191 | /* software-driven interface shutdown */ | |
192 | case -ENOENT: /* urb killed */ | |
193 | case -ESHUTDOWN: /* hardware gone */ | |
194 | netif_dbg(dev, ifdown, dev->net, | |
195 | "intr shutdown, code %d\n", status); | |
196 | return; | |
197 | ||
198 | /* NOTE: not throttling like RX/TX, since this endpoint | |
199 | * already polls infrequently | |
200 | */ | |
201 | default: | |
202 | netdev_dbg(dev->net, "intr status %d\n", status); | |
203 | break; | |
204 | } | |
205 | ||
206 | status = usb_submit_urb (urb, GFP_ATOMIC); | |
207 | if (status != 0) | |
208 | netif_err(dev, timer, dev->net, | |
209 | "intr resubmit --> %d\n", status); | |
210 | } | |
211 | ||
212 | static int init_status (struct usbnet *dev, struct usb_interface *intf) | |
213 | { | |
214 | char *buf = NULL; | |
215 | unsigned pipe = 0; | |
216 | unsigned maxp; | |
217 | unsigned period; | |
218 | ||
219 | if (!dev->driver_info->status) | |
220 | return 0; | |
221 | ||
222 | pipe = usb_rcvintpipe (dev->udev, | |
223 | dev->status->desc.bEndpointAddress | |
224 | & USB_ENDPOINT_NUMBER_MASK); | |
225 | maxp = usb_maxpacket (dev->udev, pipe, 0); | |
226 | ||
227 | /* avoid 1 msec chatter: min 8 msec poll rate */ | |
228 | period = max ((int) dev->status->desc.bInterval, | |
229 | (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); | |
230 | ||
231 | buf = kmalloc (maxp, GFP_KERNEL); | |
232 | if (buf) { | |
233 | dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); | |
234 | if (!dev->interrupt) { | |
235 | kfree (buf); | |
236 | return -ENOMEM; | |
237 | } else { | |
238 | usb_fill_int_urb(dev->interrupt, dev->udev, pipe, | |
239 | buf, maxp, intr_complete, dev, period); | |
240 | dev->interrupt->transfer_flags |= URB_FREE_BUFFER; | |
241 | dev_dbg(&intf->dev, | |
242 | "status ep%din, %d bytes period %d\n", | |
243 | usb_pipeendpoint(pipe), maxp, period); | |
244 | } | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
249 | /* Submit the interrupt URB if not previously submitted, increasing refcount */ | |
250 | int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) | |
251 | { | |
252 | int ret = 0; | |
253 | ||
254 | WARN_ON_ONCE(dev->interrupt == NULL); | |
255 | if (dev->interrupt) { | |
256 | mutex_lock(&dev->interrupt_mutex); | |
257 | ||
258 | if (++dev->interrupt_count == 1) | |
259 | ret = usb_submit_urb(dev->interrupt, mem_flags); | |
260 | ||
261 | dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", | |
262 | dev->interrupt_count); | |
263 | mutex_unlock(&dev->interrupt_mutex); | |
264 | } | |
265 | return ret; | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(usbnet_status_start); | |
268 | ||
269 | /* For resume; submit interrupt URB if previously submitted */ | |
270 | static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) | |
271 | { | |
272 | int ret = 0; | |
273 | ||
274 | mutex_lock(&dev->interrupt_mutex); | |
275 | if (dev->interrupt_count) { | |
276 | ret = usb_submit_urb(dev->interrupt, mem_flags); | |
277 | dev_dbg(&dev->udev->dev, | |
278 | "submitted interrupt URB for resume\n"); | |
279 | } | |
280 | mutex_unlock(&dev->interrupt_mutex); | |
281 | return ret; | |
282 | } | |
283 | ||
284 | /* Kill the interrupt URB if all submitters want it killed */ | |
285 | void usbnet_status_stop(struct usbnet *dev) | |
286 | { | |
287 | if (dev->interrupt) { | |
288 | mutex_lock(&dev->interrupt_mutex); | |
289 | WARN_ON(dev->interrupt_count == 0); | |
290 | ||
291 | if (dev->interrupt_count && --dev->interrupt_count == 0) | |
292 | usb_kill_urb(dev->interrupt); | |
293 | ||
294 | dev_dbg(&dev->udev->dev, | |
295 | "decremented interrupt URB count to %d\n", | |
296 | dev->interrupt_count); | |
297 | mutex_unlock(&dev->interrupt_mutex); | |
298 | } | |
299 | } | |
300 | EXPORT_SYMBOL_GPL(usbnet_status_stop); | |
301 | ||
302 | /* For suspend; always kill interrupt URB */ | |
303 | static void __usbnet_status_stop_force(struct usbnet *dev) | |
304 | { | |
305 | if (dev->interrupt) { | |
306 | mutex_lock(&dev->interrupt_mutex); | |
307 | usb_kill_urb(dev->interrupt); | |
308 | dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); | |
309 | mutex_unlock(&dev->interrupt_mutex); | |
310 | } | |
311 | } | |
312 | ||
313 | /* Passes this packet up the stack, updating its accounting. | |
314 | * Some link protocols batch packets, so their rx_fixup paths | |
315 | * can return clones as well as just modify the original skb. | |
316 | */ | |
317 | void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) | |
318 | { | |
319 | int status; | |
320 | ||
321 | if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { | |
322 | skb_queue_tail(&dev->rxq_pause, skb); | |
323 | return; | |
324 | } | |
325 | ||
326 | skb->protocol = eth_type_trans (skb, dev->net); | |
327 | dev->net->stats.rx_packets++; | |
328 | dev->net->stats.rx_bytes += skb->len; | |
329 | ||
330 | netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", | |
331 | skb->len + sizeof (struct ethhdr), skb->protocol); | |
332 | memset (skb->cb, 0, sizeof (struct skb_data)); | |
333 | ||
334 | if (skb_defer_rx_timestamp(skb)) | |
335 | return; | |
336 | ||
337 | status = netif_rx (skb); | |
338 | if (status != NET_RX_SUCCESS) | |
339 | netif_dbg(dev, rx_err, dev->net, | |
340 | "netif_rx status %d\n", status); | |
341 | } | |
342 | EXPORT_SYMBOL_GPL(usbnet_skb_return); | |
343 | ||
344 | /* must be called if hard_mtu or rx_urb_size changed */ | |
345 | void usbnet_update_max_qlen(struct usbnet *dev) | |
346 | { | |
347 | enum usb_device_speed speed = dev->udev->speed; | |
348 | ||
349 | switch (speed) { | |
350 | case USB_SPEED_HIGH: | |
351 | dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; | |
352 | dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; | |
353 | break; | |
354 | case USB_SPEED_SUPER: | |
355 | /* | |
356 | * Not take default 5ms qlen for super speed HC to | |
357 | * save memory, and iperf tests show 2.5ms qlen can | |
358 | * work well | |
359 | */ | |
360 | dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; | |
361 | dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; | |
362 | break; | |
363 | default: | |
364 | dev->rx_qlen = dev->tx_qlen = 4; | |
365 | } | |
366 | } | |
367 | EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); | |
368 | ||
369 | \f | |
370 | /*------------------------------------------------------------------------- | |
371 | * | |
372 | * Network Device Driver (peer link to "Host Device", from USB host) | |
373 | * | |
374 | *-------------------------------------------------------------------------*/ | |
375 | ||
376 | int usbnet_change_mtu (struct net_device *net, int new_mtu) | |
377 | { | |
378 | struct usbnet *dev = netdev_priv(net); | |
379 | int ll_mtu = new_mtu + net->hard_header_len; | |
380 | int old_hard_mtu = dev->hard_mtu; | |
381 | int old_rx_urb_size = dev->rx_urb_size; | |
382 | ||
383 | if (new_mtu <= 0) | |
384 | return -EINVAL; | |
385 | // no second zero-length packet read wanted after mtu-sized packets | |
386 | if ((ll_mtu % dev->maxpacket) == 0) | |
387 | return -EDOM; | |
388 | net->mtu = new_mtu; | |
389 | ||
390 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
391 | if (dev->rx_urb_size == old_hard_mtu) { | |
392 | dev->rx_urb_size = dev->hard_mtu; | |
393 | if (dev->rx_urb_size > old_rx_urb_size) | |
394 | usbnet_unlink_rx_urbs(dev); | |
395 | } | |
396 | ||
397 | /* max qlen depend on hard_mtu and rx_urb_size */ | |
398 | usbnet_update_max_qlen(dev); | |
399 | ||
400 | return 0; | |
401 | } | |
402 | EXPORT_SYMBOL_GPL(usbnet_change_mtu); | |
403 | ||
404 | /* The caller must hold list->lock */ | |
405 | static void __usbnet_queue_skb(struct sk_buff_head *list, | |
406 | struct sk_buff *newsk, enum skb_state state) | |
407 | { | |
408 | struct skb_data *entry = (struct skb_data *) newsk->cb; | |
409 | ||
410 | __skb_queue_tail(list, newsk); | |
411 | entry->state = state; | |
412 | } | |
413 | ||
414 | /*-------------------------------------------------------------------------*/ | |
415 | ||
416 | /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from | |
417 | * completion callbacks. 2.5 should have fixed those bugs... | |
418 | */ | |
419 | ||
420 | static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, | |
421 | struct sk_buff_head *list, enum skb_state state) | |
422 | { | |
423 | unsigned long flags; | |
424 | enum skb_state old_state; | |
425 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
426 | ||
427 | spin_lock_irqsave(&list->lock, flags); | |
428 | old_state = entry->state; | |
429 | entry->state = state; | |
430 | __skb_unlink(skb, list); | |
431 | spin_unlock(&list->lock); | |
432 | spin_lock(&dev->done.lock); | |
433 | __skb_queue_tail(&dev->done, skb); | |
434 | if (dev->done.qlen == 1) | |
435 | tasklet_schedule(&dev->bh); | |
436 | spin_unlock_irqrestore(&dev->done.lock, flags); | |
437 | return old_state; | |
438 | } | |
439 | ||
440 | /* some work can't be done in tasklets, so we use keventd | |
441 | * | |
442 | * NOTE: annoying asymmetry: if it's active, schedule_work() fails, | |
443 | * but tasklet_schedule() doesn't. hope the failure is rare. | |
444 | */ | |
445 | void usbnet_defer_kevent (struct usbnet *dev, int work) | |
446 | { | |
447 | set_bit (work, &dev->flags); | |
448 | if (!schedule_work (&dev->kevent)) { | |
449 | if (net_ratelimit()) | |
450 | netdev_err(dev->net, "kevent %d may have been dropped\n", work); | |
451 | } else { | |
452 | netdev_dbg(dev->net, "kevent %d scheduled\n", work); | |
453 | } | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(usbnet_defer_kevent); | |
456 | ||
457 | /*-------------------------------------------------------------------------*/ | |
458 | ||
459 | static void rx_complete (struct urb *urb); | |
460 | ||
461 | static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) | |
462 | { | |
463 | struct sk_buff *skb; | |
464 | struct skb_data *entry; | |
465 | int retval = 0; | |
466 | unsigned long lockflags; | |
467 | size_t size = dev->rx_urb_size; | |
468 | ||
469 | /* prevent rx skb allocation when error ratio is high */ | |
470 | if (test_bit(EVENT_RX_KILL, &dev->flags)) { | |
471 | usb_free_urb(urb); | |
472 | return -ENOLINK; | |
473 | } | |
474 | ||
475 | skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); | |
476 | if (!skb) { | |
477 | netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); | |
478 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); | |
479 | usb_free_urb (urb); | |
480 | return -ENOMEM; | |
481 | } | |
482 | ||
483 | entry = (struct skb_data *) skb->cb; | |
484 | entry->urb = urb; | |
485 | entry->dev = dev; | |
486 | entry->length = 0; | |
487 | ||
488 | usb_fill_bulk_urb (urb, dev->udev, dev->in, | |
489 | skb->data, size, rx_complete, skb); | |
490 | ||
491 | spin_lock_irqsave (&dev->rxq.lock, lockflags); | |
492 | ||
493 | if (netif_running (dev->net) && | |
494 | netif_device_present (dev->net) && | |
495 | !test_bit (EVENT_RX_HALT, &dev->flags) && | |
496 | !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { | |
497 | switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { | |
498 | case -EPIPE: | |
499 | usbnet_defer_kevent (dev, EVENT_RX_HALT); | |
500 | break; | |
501 | case -ENOMEM: | |
502 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); | |
503 | break; | |
504 | case -ENODEV: | |
505 | netif_dbg(dev, ifdown, dev->net, "device gone\n"); | |
506 | netif_device_detach (dev->net); | |
507 | break; | |
508 | case -EHOSTUNREACH: | |
509 | retval = -ENOLINK; | |
510 | break; | |
511 | default: | |
512 | netif_dbg(dev, rx_err, dev->net, | |
513 | "rx submit, %d\n", retval); | |
514 | tasklet_schedule (&dev->bh); | |
515 | break; | |
516 | case 0: | |
517 | __usbnet_queue_skb(&dev->rxq, skb, rx_start); | |
518 | } | |
519 | } else { | |
520 | netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); | |
521 | retval = -ENOLINK; | |
522 | } | |
523 | spin_unlock_irqrestore (&dev->rxq.lock, lockflags); | |
524 | if (retval) { | |
525 | dev_kfree_skb_any (skb); | |
526 | usb_free_urb (urb); | |
527 | } | |
528 | return retval; | |
529 | } | |
530 | ||
531 | ||
532 | /*-------------------------------------------------------------------------*/ | |
533 | ||
534 | static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) | |
535 | { | |
536 | if (dev->driver_info->rx_fixup && | |
537 | !dev->driver_info->rx_fixup (dev, skb)) { | |
538 | /* With RX_ASSEMBLE, rx_fixup() must update counters */ | |
539 | if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) | |
540 | dev->net->stats.rx_errors++; | |
541 | goto done; | |
542 | } | |
543 | // else network stack removes extra byte if we forced a short packet | |
544 | ||
545 | /* all data was already cloned from skb inside the driver */ | |
546 | if (dev->driver_info->flags & FLAG_MULTI_PACKET) | |
547 | goto done; | |
548 | ||
549 | if (skb->len < ETH_HLEN) { | |
550 | dev->net->stats.rx_errors++; | |
551 | dev->net->stats.rx_length_errors++; | |
552 | netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); | |
553 | } else { | |
554 | usbnet_skb_return(dev, skb); | |
555 | return; | |
556 | } | |
557 | ||
558 | done: | |
559 | skb_queue_tail(&dev->done, skb); | |
560 | } | |
561 | ||
562 | /*-------------------------------------------------------------------------*/ | |
563 | ||
564 | static void rx_complete (struct urb *urb) | |
565 | { | |
566 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
567 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
568 | struct usbnet *dev = entry->dev; | |
569 | int urb_status = urb->status; | |
570 | enum skb_state state; | |
571 | ||
572 | skb_put (skb, urb->actual_length); | |
573 | state = rx_done; | |
574 | entry->urb = NULL; | |
575 | ||
576 | switch (urb_status) { | |
577 | /* success */ | |
578 | case 0: | |
579 | break; | |
580 | ||
581 | /* stalls need manual reset. this is rare ... except that | |
582 | * when going through USB 2.0 TTs, unplug appears this way. | |
583 | * we avoid the highspeed version of the ETIMEDOUT/EILSEQ | |
584 | * storm, recovering as needed. | |
585 | */ | |
586 | case -EPIPE: | |
587 | dev->net->stats.rx_errors++; | |
588 | usbnet_defer_kevent (dev, EVENT_RX_HALT); | |
589 | // FALLTHROUGH | |
590 | ||
591 | /* software-driven interface shutdown */ | |
592 | case -ECONNRESET: /* async unlink */ | |
593 | case -ESHUTDOWN: /* hardware gone */ | |
594 | netif_dbg(dev, ifdown, dev->net, | |
595 | "rx shutdown, code %d\n", urb_status); | |
596 | goto block; | |
597 | ||
598 | /* we get controller i/o faults during hub_wq disconnect() delays. | |
599 | * throttle down resubmits, to avoid log floods; just temporarily, | |
600 | * so we still recover when the fault isn't a hub_wq delay. | |
601 | */ | |
602 | case -EPROTO: | |
603 | case -ETIME: | |
604 | case -EILSEQ: | |
605 | dev->net->stats.rx_errors++; | |
606 | if (!timer_pending (&dev->delay)) { | |
607 | mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); | |
608 | netif_dbg(dev, link, dev->net, | |
609 | "rx throttle %d\n", urb_status); | |
610 | } | |
611 | block: | |
612 | state = rx_cleanup; | |
613 | entry->urb = urb; | |
614 | urb = NULL; | |
615 | break; | |
616 | ||
617 | /* data overrun ... flush fifo? */ | |
618 | case -EOVERFLOW: | |
619 | dev->net->stats.rx_over_errors++; | |
620 | // FALLTHROUGH | |
621 | ||
622 | default: | |
623 | state = rx_cleanup; | |
624 | dev->net->stats.rx_errors++; | |
625 | netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); | |
626 | break; | |
627 | } | |
628 | ||
629 | /* stop rx if packet error rate is high */ | |
630 | if (++dev->pkt_cnt > 30) { | |
631 | dev->pkt_cnt = 0; | |
632 | dev->pkt_err = 0; | |
633 | } else { | |
634 | if (state == rx_cleanup) | |
635 | dev->pkt_err++; | |
636 | if (dev->pkt_err > 20) | |
637 | set_bit(EVENT_RX_KILL, &dev->flags); | |
638 | } | |
639 | ||
640 | state = defer_bh(dev, skb, &dev->rxq, state); | |
641 | ||
642 | if (urb) { | |
643 | if (netif_running (dev->net) && | |
644 | !test_bit (EVENT_RX_HALT, &dev->flags) && | |
645 | state != unlink_start) { | |
646 | rx_submit (dev, urb, GFP_ATOMIC); | |
647 | usb_mark_last_busy(dev->udev); | |
648 | return; | |
649 | } | |
650 | usb_free_urb (urb); | |
651 | } | |
652 | netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); | |
653 | } | |
654 | ||
655 | /*-------------------------------------------------------------------------*/ | |
656 | void usbnet_pause_rx(struct usbnet *dev) | |
657 | { | |
658 | set_bit(EVENT_RX_PAUSED, &dev->flags); | |
659 | ||
660 | netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); | |
661 | } | |
662 | EXPORT_SYMBOL_GPL(usbnet_pause_rx); | |
663 | ||
664 | void usbnet_resume_rx(struct usbnet *dev) | |
665 | { | |
666 | struct sk_buff *skb; | |
667 | int num = 0; | |
668 | ||
669 | clear_bit(EVENT_RX_PAUSED, &dev->flags); | |
670 | ||
671 | while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { | |
672 | usbnet_skb_return(dev, skb); | |
673 | num++; | |
674 | } | |
675 | ||
676 | tasklet_schedule(&dev->bh); | |
677 | ||
678 | netif_dbg(dev, rx_status, dev->net, | |
679 | "paused rx queue disabled, %d skbs requeued\n", num); | |
680 | } | |
681 | EXPORT_SYMBOL_GPL(usbnet_resume_rx); | |
682 | ||
683 | void usbnet_purge_paused_rxq(struct usbnet *dev) | |
684 | { | |
685 | skb_queue_purge(&dev->rxq_pause); | |
686 | } | |
687 | EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); | |
688 | ||
689 | /*-------------------------------------------------------------------------*/ | |
690 | ||
691 | // unlink pending rx/tx; completion handlers do all other cleanup | |
692 | ||
693 | static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) | |
694 | { | |
695 | unsigned long flags; | |
696 | struct sk_buff *skb; | |
697 | int count = 0; | |
698 | ||
699 | spin_lock_irqsave (&q->lock, flags); | |
700 | while (!skb_queue_empty(q)) { | |
701 | struct skb_data *entry; | |
702 | struct urb *urb; | |
703 | int retval; | |
704 | ||
705 | skb_queue_walk(q, skb) { | |
706 | entry = (struct skb_data *) skb->cb; | |
707 | if (entry->state != unlink_start) | |
708 | goto found; | |
709 | } | |
710 | break; | |
711 | found: | |
712 | entry->state = unlink_start; | |
713 | urb = entry->urb; | |
714 | ||
715 | /* | |
716 | * Get reference count of the URB to avoid it to be | |
717 | * freed during usb_unlink_urb, which may trigger | |
718 | * use-after-free problem inside usb_unlink_urb since | |
719 | * usb_unlink_urb is always racing with .complete | |
720 | * handler(include defer_bh). | |
721 | */ | |
722 | usb_get_urb(urb); | |
723 | spin_unlock_irqrestore(&q->lock, flags); | |
724 | // during some PM-driven resume scenarios, | |
725 | // these (async) unlinks complete immediately | |
726 | retval = usb_unlink_urb (urb); | |
727 | if (retval != -EINPROGRESS && retval != 0) | |
728 | netdev_dbg(dev->net, "unlink urb err, %d\n", retval); | |
729 | else | |
730 | count++; | |
731 | usb_put_urb(urb); | |
732 | spin_lock_irqsave(&q->lock, flags); | |
733 | } | |
734 | spin_unlock_irqrestore (&q->lock, flags); | |
735 | return count; | |
736 | } | |
737 | ||
738 | // Flush all pending rx urbs | |
739 | // minidrivers may need to do this when the MTU changes | |
740 | ||
741 | void usbnet_unlink_rx_urbs(struct usbnet *dev) | |
742 | { | |
743 | if (netif_running(dev->net)) { | |
744 | (void) unlink_urbs (dev, &dev->rxq); | |
745 | tasklet_schedule(&dev->bh); | |
746 | } | |
747 | } | |
748 | EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); | |
749 | ||
750 | /*-------------------------------------------------------------------------*/ | |
751 | ||
752 | // precondition: never called in_interrupt | |
753 | static void usbnet_terminate_urbs(struct usbnet *dev) | |
754 | { | |
755 | DECLARE_WAITQUEUE(wait, current); | |
756 | int temp; | |
757 | ||
758 | /* ensure there are no more active urbs */ | |
759 | add_wait_queue(&dev->wait, &wait); | |
760 | set_current_state(TASK_UNINTERRUPTIBLE); | |
761 | temp = unlink_urbs(dev, &dev->txq) + | |
762 | unlink_urbs(dev, &dev->rxq); | |
763 | ||
764 | /* maybe wait for deletions to finish. */ | |
765 | while (!skb_queue_empty(&dev->rxq) | |
766 | && !skb_queue_empty(&dev->txq) | |
767 | && !skb_queue_empty(&dev->done)) { | |
768 | schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); | |
769 | set_current_state(TASK_UNINTERRUPTIBLE); | |
770 | netif_dbg(dev, ifdown, dev->net, | |
771 | "waited for %d urb completions\n", temp); | |
772 | } | |
773 | set_current_state(TASK_RUNNING); | |
774 | remove_wait_queue(&dev->wait, &wait); | |
775 | } | |
776 | ||
777 | int usbnet_stop (struct net_device *net) | |
778 | { | |
779 | struct usbnet *dev = netdev_priv(net); | |
780 | struct driver_info *info = dev->driver_info; | |
781 | int retval, pm; | |
782 | ||
783 | clear_bit(EVENT_DEV_OPEN, &dev->flags); | |
784 | netif_stop_queue (net); | |
785 | ||
786 | netif_info(dev, ifdown, dev->net, | |
787 | "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", | |
788 | net->stats.rx_packets, net->stats.tx_packets, | |
789 | net->stats.rx_errors, net->stats.tx_errors); | |
790 | ||
791 | /* to not race resume */ | |
792 | pm = usb_autopm_get_interface(dev->intf); | |
793 | /* allow minidriver to stop correctly (wireless devices to turn off | |
794 | * radio etc) */ | |
795 | if (info->stop) { | |
796 | retval = info->stop(dev); | |
797 | if (retval < 0) | |
798 | netif_info(dev, ifdown, dev->net, | |
799 | "stop fail (%d) usbnet usb-%s-%s, %s\n", | |
800 | retval, | |
801 | dev->udev->bus->bus_name, dev->udev->devpath, | |
802 | info->description); | |
803 | } | |
804 | ||
805 | if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) | |
806 | usbnet_terminate_urbs(dev); | |
807 | ||
808 | usbnet_status_stop(dev); | |
809 | ||
810 | usbnet_purge_paused_rxq(dev); | |
811 | ||
812 | /* deferred work (task, timer, softirq) must also stop. | |
813 | * can't flush_scheduled_work() until we drop rtnl (later), | |
814 | * else workers could deadlock; so make workers a NOP. | |
815 | */ | |
816 | dev->flags = 0; | |
817 | del_timer_sync (&dev->delay); | |
818 | tasklet_kill (&dev->bh); | |
819 | if (!pm) | |
820 | usb_autopm_put_interface(dev->intf); | |
821 | ||
822 | if (info->manage_power && | |
823 | !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags)) | |
824 | info->manage_power(dev, 0); | |
825 | else | |
826 | usb_autopm_put_interface(dev->intf); | |
827 | ||
828 | return 0; | |
829 | } | |
830 | EXPORT_SYMBOL_GPL(usbnet_stop); | |
831 | ||
832 | /*-------------------------------------------------------------------------*/ | |
833 | ||
834 | // posts reads, and enables write queuing | |
835 | ||
836 | // precondition: never called in_interrupt | |
837 | ||
838 | int usbnet_open (struct net_device *net) | |
839 | { | |
840 | struct usbnet *dev = netdev_priv(net); | |
841 | int retval; | |
842 | struct driver_info *info = dev->driver_info; | |
843 | ||
844 | if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { | |
845 | netif_info(dev, ifup, dev->net, | |
846 | "resumption fail (%d) usbnet usb-%s-%s, %s\n", | |
847 | retval, | |
848 | dev->udev->bus->bus_name, | |
849 | dev->udev->devpath, | |
850 | info->description); | |
851 | goto done_nopm; | |
852 | } | |
853 | ||
854 | // put into "known safe" state | |
855 | if (info->reset && (retval = info->reset (dev)) < 0) { | |
856 | netif_info(dev, ifup, dev->net, | |
857 | "open reset fail (%d) usbnet usb-%s-%s, %s\n", | |
858 | retval, | |
859 | dev->udev->bus->bus_name, | |
860 | dev->udev->devpath, | |
861 | info->description); | |
862 | goto done; | |
863 | } | |
864 | ||
865 | /* hard_mtu or rx_urb_size may change in reset() */ | |
866 | usbnet_update_max_qlen(dev); | |
867 | ||
868 | // insist peer be connected | |
869 | if (info->check_connect && (retval = info->check_connect (dev)) < 0) { | |
870 | netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); | |
871 | goto done; | |
872 | } | |
873 | ||
874 | /* start any status interrupt transfer */ | |
875 | if (dev->interrupt) { | |
876 | retval = usbnet_status_start(dev, GFP_KERNEL); | |
877 | if (retval < 0) { | |
878 | netif_err(dev, ifup, dev->net, | |
879 | "intr submit %d\n", retval); | |
880 | goto done; | |
881 | } | |
882 | } | |
883 | ||
884 | set_bit(EVENT_DEV_OPEN, &dev->flags); | |
885 | netif_start_queue (net); | |
886 | netif_info(dev, ifup, dev->net, | |
887 | "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", | |
888 | (int)RX_QLEN(dev), (int)TX_QLEN(dev), | |
889 | dev->net->mtu, | |
890 | (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : | |
891 | (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : | |
892 | (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : | |
893 | (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : | |
894 | (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : | |
895 | "simple"); | |
896 | ||
897 | /* reset rx error state */ | |
898 | dev->pkt_cnt = 0; | |
899 | dev->pkt_err = 0; | |
900 | clear_bit(EVENT_RX_KILL, &dev->flags); | |
901 | ||
902 | // delay posting reads until we're fully open | |
903 | tasklet_schedule (&dev->bh); | |
904 | if (info->manage_power) { | |
905 | retval = info->manage_power(dev, 1); | |
906 | if (retval < 0) { | |
907 | retval = 0; | |
908 | set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); | |
909 | } else { | |
910 | usb_autopm_put_interface(dev->intf); | |
911 | } | |
912 | } | |
913 | return retval; | |
914 | done: | |
915 | usb_autopm_put_interface(dev->intf); | |
916 | done_nopm: | |
917 | return retval; | |
918 | } | |
919 | EXPORT_SYMBOL_GPL(usbnet_open); | |
920 | ||
921 | /*-------------------------------------------------------------------------*/ | |
922 | ||
923 | /* ethtool methods; minidrivers may need to add some more, but | |
924 | * they'll probably want to use this base set. | |
925 | */ | |
926 | ||
927 | int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) | |
928 | { | |
929 | struct usbnet *dev = netdev_priv(net); | |
930 | ||
931 | if (!dev->mii.mdio_read) | |
932 | return -EOPNOTSUPP; | |
933 | ||
934 | return mii_ethtool_gset(&dev->mii, cmd); | |
935 | } | |
936 | EXPORT_SYMBOL_GPL(usbnet_get_settings); | |
937 | ||
938 | int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) | |
939 | { | |
940 | struct usbnet *dev = netdev_priv(net); | |
941 | int retval; | |
942 | ||
943 | if (!dev->mii.mdio_write) | |
944 | return -EOPNOTSUPP; | |
945 | ||
946 | retval = mii_ethtool_sset(&dev->mii, cmd); | |
947 | ||
948 | /* link speed/duplex might have changed */ | |
949 | if (dev->driver_info->link_reset) | |
950 | dev->driver_info->link_reset(dev); | |
951 | ||
952 | /* hard_mtu or rx_urb_size may change in link_reset() */ | |
953 | usbnet_update_max_qlen(dev); | |
954 | ||
955 | return retval; | |
956 | ||
957 | } | |
958 | EXPORT_SYMBOL_GPL(usbnet_set_settings); | |
959 | ||
960 | u32 usbnet_get_link (struct net_device *net) | |
961 | { | |
962 | struct usbnet *dev = netdev_priv(net); | |
963 | ||
964 | /* If a check_connect is defined, return its result */ | |
965 | if (dev->driver_info->check_connect) | |
966 | return dev->driver_info->check_connect (dev) == 0; | |
967 | ||
968 | /* if the device has mii operations, use those */ | |
969 | if (dev->mii.mdio_read) | |
970 | return mii_link_ok(&dev->mii); | |
971 | ||
972 | /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ | |
973 | return ethtool_op_get_link(net); | |
974 | } | |
975 | EXPORT_SYMBOL_GPL(usbnet_get_link); | |
976 | ||
977 | int usbnet_nway_reset(struct net_device *net) | |
978 | { | |
979 | struct usbnet *dev = netdev_priv(net); | |
980 | ||
981 | if (!dev->mii.mdio_write) | |
982 | return -EOPNOTSUPP; | |
983 | ||
984 | return mii_nway_restart(&dev->mii); | |
985 | } | |
986 | EXPORT_SYMBOL_GPL(usbnet_nway_reset); | |
987 | ||
988 | void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) | |
989 | { | |
990 | struct usbnet *dev = netdev_priv(net); | |
991 | ||
992 | strlcpy (info->driver, dev->driver_name, sizeof info->driver); | |
993 | strlcpy (info->version, DRIVER_VERSION, sizeof info->version); | |
994 | strlcpy (info->fw_version, dev->driver_info->description, | |
995 | sizeof info->fw_version); | |
996 | usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); | |
997 | } | |
998 | EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); | |
999 | ||
1000 | u32 usbnet_get_msglevel (struct net_device *net) | |
1001 | { | |
1002 | struct usbnet *dev = netdev_priv(net); | |
1003 | ||
1004 | return dev->msg_enable; | |
1005 | } | |
1006 | EXPORT_SYMBOL_GPL(usbnet_get_msglevel); | |
1007 | ||
1008 | void usbnet_set_msglevel (struct net_device *net, u32 level) | |
1009 | { | |
1010 | struct usbnet *dev = netdev_priv(net); | |
1011 | ||
1012 | dev->msg_enable = level; | |
1013 | } | |
1014 | EXPORT_SYMBOL_GPL(usbnet_set_msglevel); | |
1015 | ||
1016 | /* drivers may override default ethtool_ops in their bind() routine */ | |
1017 | static const struct ethtool_ops usbnet_ethtool_ops = { | |
1018 | .get_settings = usbnet_get_settings, | |
1019 | .set_settings = usbnet_set_settings, | |
1020 | .get_link = usbnet_get_link, | |
1021 | .nway_reset = usbnet_nway_reset, | |
1022 | .get_drvinfo = usbnet_get_drvinfo, | |
1023 | .get_msglevel = usbnet_get_msglevel, | |
1024 | .set_msglevel = usbnet_set_msglevel, | |
1025 | .get_ts_info = ethtool_op_get_ts_info, | |
1026 | }; | |
1027 | ||
1028 | /*-------------------------------------------------------------------------*/ | |
1029 | ||
1030 | static void __handle_link_change(struct usbnet *dev) | |
1031 | { | |
1032 | if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) | |
1033 | return; | |
1034 | ||
1035 | if (!netif_carrier_ok(dev->net)) { | |
1036 | /* kill URBs for reading packets to save bus bandwidth */ | |
1037 | unlink_urbs(dev, &dev->rxq); | |
1038 | ||
1039 | /* | |
1040 | * tx_timeout will unlink URBs for sending packets and | |
1041 | * tx queue is stopped by netcore after link becomes off | |
1042 | */ | |
1043 | } else { | |
1044 | /* submitting URBs for reading packets */ | |
1045 | tasklet_schedule(&dev->bh); | |
1046 | } | |
1047 | ||
1048 | /* hard_mtu or rx_urb_size may change during link change */ | |
1049 | usbnet_update_max_qlen(dev); | |
1050 | ||
1051 | clear_bit(EVENT_LINK_CHANGE, &dev->flags); | |
1052 | } | |
1053 | ||
1054 | static void usbnet_set_rx_mode(struct net_device *net) | |
1055 | { | |
1056 | struct usbnet *dev = netdev_priv(net); | |
1057 | ||
1058 | usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); | |
1059 | } | |
1060 | ||
1061 | static void __handle_set_rx_mode(struct usbnet *dev) | |
1062 | { | |
1063 | if (dev->driver_info->set_rx_mode) | |
1064 | (dev->driver_info->set_rx_mode)(dev); | |
1065 | ||
1066 | clear_bit(EVENT_SET_RX_MODE, &dev->flags); | |
1067 | } | |
1068 | ||
1069 | /* work that cannot be done in interrupt context uses keventd. | |
1070 | * | |
1071 | * NOTE: with 2.5 we could do more of this using completion callbacks, | |
1072 | * especially now that control transfers can be queued. | |
1073 | */ | |
1074 | static void | |
1075 | kevent (struct work_struct *work) | |
1076 | { | |
1077 | struct usbnet *dev = | |
1078 | container_of(work, struct usbnet, kevent); | |
1079 | int status; | |
1080 | ||
1081 | /* usb_clear_halt() needs a thread context */ | |
1082 | if (test_bit (EVENT_TX_HALT, &dev->flags)) { | |
1083 | unlink_urbs (dev, &dev->txq); | |
1084 | status = usb_autopm_get_interface(dev->intf); | |
1085 | if (status < 0) | |
1086 | goto fail_pipe; | |
1087 | status = usb_clear_halt (dev->udev, dev->out); | |
1088 | usb_autopm_put_interface(dev->intf); | |
1089 | if (status < 0 && | |
1090 | status != -EPIPE && | |
1091 | status != -ESHUTDOWN) { | |
1092 | if (netif_msg_tx_err (dev)) | |
1093 | fail_pipe: | |
1094 | netdev_err(dev->net, "can't clear tx halt, status %d\n", | |
1095 | status); | |
1096 | } else { | |
1097 | clear_bit (EVENT_TX_HALT, &dev->flags); | |
1098 | if (status != -ESHUTDOWN) | |
1099 | netif_wake_queue (dev->net); | |
1100 | } | |
1101 | } | |
1102 | if (test_bit (EVENT_RX_HALT, &dev->flags)) { | |
1103 | unlink_urbs (dev, &dev->rxq); | |
1104 | status = usb_autopm_get_interface(dev->intf); | |
1105 | if (status < 0) | |
1106 | goto fail_halt; | |
1107 | status = usb_clear_halt (dev->udev, dev->in); | |
1108 | usb_autopm_put_interface(dev->intf); | |
1109 | if (status < 0 && | |
1110 | status != -EPIPE && | |
1111 | status != -ESHUTDOWN) { | |
1112 | if (netif_msg_rx_err (dev)) | |
1113 | fail_halt: | |
1114 | netdev_err(dev->net, "can't clear rx halt, status %d\n", | |
1115 | status); | |
1116 | } else { | |
1117 | clear_bit (EVENT_RX_HALT, &dev->flags); | |
1118 | tasklet_schedule (&dev->bh); | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | /* tasklet could resubmit itself forever if memory is tight */ | |
1123 | if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { | |
1124 | struct urb *urb = NULL; | |
1125 | int resched = 1; | |
1126 | ||
1127 | if (netif_running (dev->net)) | |
1128 | urb = usb_alloc_urb (0, GFP_KERNEL); | |
1129 | else | |
1130 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
1131 | if (urb != NULL) { | |
1132 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
1133 | status = usb_autopm_get_interface(dev->intf); | |
1134 | if (status < 0) { | |
1135 | usb_free_urb(urb); | |
1136 | goto fail_lowmem; | |
1137 | } | |
1138 | if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) | |
1139 | resched = 0; | |
1140 | usb_autopm_put_interface(dev->intf); | |
1141 | fail_lowmem: | |
1142 | if (resched) | |
1143 | tasklet_schedule (&dev->bh); | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | if (test_bit (EVENT_LINK_RESET, &dev->flags)) { | |
1148 | struct driver_info *info = dev->driver_info; | |
1149 | int retval = 0; | |
1150 | ||
1151 | clear_bit (EVENT_LINK_RESET, &dev->flags); | |
1152 | status = usb_autopm_get_interface(dev->intf); | |
1153 | if (status < 0) | |
1154 | goto skip_reset; | |
1155 | if(info->link_reset && (retval = info->link_reset(dev)) < 0) { | |
1156 | usb_autopm_put_interface(dev->intf); | |
1157 | skip_reset: | |
1158 | netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", | |
1159 | retval, | |
1160 | dev->udev->bus->bus_name, | |
1161 | dev->udev->devpath, | |
1162 | info->description); | |
1163 | } else { | |
1164 | usb_autopm_put_interface(dev->intf); | |
1165 | } | |
1166 | ||
1167 | /* handle link change from link resetting */ | |
1168 | __handle_link_change(dev); | |
1169 | } | |
1170 | ||
1171 | if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) | |
1172 | __handle_link_change(dev); | |
1173 | ||
1174 | if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) | |
1175 | __handle_set_rx_mode(dev); | |
1176 | ||
1177 | ||
1178 | if (dev->flags) | |
1179 | netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); | |
1180 | } | |
1181 | ||
1182 | /*-------------------------------------------------------------------------*/ | |
1183 | ||
1184 | static void tx_complete (struct urb *urb) | |
1185 | { | |
1186 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
1187 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
1188 | struct usbnet *dev = entry->dev; | |
1189 | ||
1190 | if (urb->status == 0) { | |
1191 | dev->net->stats.tx_packets += entry->packets; | |
1192 | dev->net->stats.tx_bytes += entry->length; | |
1193 | } else { | |
1194 | dev->net->stats.tx_errors++; | |
1195 | ||
1196 | switch (urb->status) { | |
1197 | case -EPIPE: | |
1198 | usbnet_defer_kevent (dev, EVENT_TX_HALT); | |
1199 | break; | |
1200 | ||
1201 | /* software-driven interface shutdown */ | |
1202 | case -ECONNRESET: // async unlink | |
1203 | case -ESHUTDOWN: // hardware gone | |
1204 | break; | |
1205 | ||
1206 | /* like rx, tx gets controller i/o faults during hub_wq | |
1207 | * delays and so it uses the same throttling mechanism. | |
1208 | */ | |
1209 | case -EPROTO: | |
1210 | case -ETIME: | |
1211 | case -EILSEQ: | |
1212 | usb_mark_last_busy(dev->udev); | |
1213 | if (!timer_pending (&dev->delay)) { | |
1214 | mod_timer (&dev->delay, | |
1215 | jiffies + THROTTLE_JIFFIES); | |
1216 | netif_dbg(dev, link, dev->net, | |
1217 | "tx throttle %d\n", urb->status); | |
1218 | } | |
1219 | netif_stop_queue (dev->net); | |
1220 | break; | |
1221 | default: | |
1222 | netif_dbg(dev, tx_err, dev->net, | |
1223 | "tx err %d\n", entry->urb->status); | |
1224 | break; | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | usb_autopm_put_interface_async(dev->intf); | |
1229 | (void) defer_bh(dev, skb, &dev->txq, tx_done); | |
1230 | } | |
1231 | ||
1232 | /*-------------------------------------------------------------------------*/ | |
1233 | ||
1234 | void usbnet_tx_timeout (struct net_device *net) | |
1235 | { | |
1236 | struct usbnet *dev = netdev_priv(net); | |
1237 | ||
1238 | unlink_urbs (dev, &dev->txq); | |
1239 | tasklet_schedule (&dev->bh); | |
1240 | /* this needs to be handled individually because the generic layer | |
1241 | * doesn't know what is sufficient and could not restore private | |
1242 | * information if a remedy of an unconditional reset were used. | |
1243 | */ | |
1244 | if (dev->driver_info->recover) | |
1245 | (dev->driver_info->recover)(dev); | |
1246 | } | |
1247 | EXPORT_SYMBOL_GPL(usbnet_tx_timeout); | |
1248 | ||
1249 | /*-------------------------------------------------------------------------*/ | |
1250 | ||
1251 | static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) | |
1252 | { | |
1253 | unsigned num_sgs, total_len = 0; | |
1254 | int i, s = 0; | |
1255 | ||
1256 | num_sgs = skb_shinfo(skb)->nr_frags + 1; | |
1257 | if (num_sgs == 1) | |
1258 | return 0; | |
1259 | ||
1260 | /* reserve one for zero packet */ | |
1261 | urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), | |
1262 | GFP_ATOMIC); | |
1263 | if (!urb->sg) | |
1264 | return -ENOMEM; | |
1265 | ||
1266 | urb->num_sgs = num_sgs; | |
1267 | sg_init_table(urb->sg, urb->num_sgs + 1); | |
1268 | ||
1269 | sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); | |
1270 | total_len += skb_headlen(skb); | |
1271 | ||
1272 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1273 | struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; | |
1274 | ||
1275 | total_len += skb_frag_size(f); | |
1276 | sg_set_page(&urb->sg[i + s], f->page.p, f->size, | |
1277 | f->page_offset); | |
1278 | } | |
1279 | urb->transfer_buffer_length = total_len; | |
1280 | ||
1281 | return 1; | |
1282 | } | |
1283 | ||
1284 | netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, | |
1285 | struct net_device *net) | |
1286 | { | |
1287 | struct usbnet *dev = netdev_priv(net); | |
1288 | int length; | |
1289 | struct urb *urb = NULL; | |
1290 | struct skb_data *entry; | |
1291 | struct driver_info *info = dev->driver_info; | |
1292 | unsigned long flags; | |
1293 | int retval; | |
1294 | ||
1295 | if (skb) | |
1296 | skb_tx_timestamp(skb); | |
1297 | ||
1298 | // some devices want funky USB-level framing, for | |
1299 | // win32 driver (usually) and/or hardware quirks | |
1300 | if (info->tx_fixup) { | |
1301 | skb = info->tx_fixup (dev, skb, GFP_ATOMIC); | |
1302 | if (!skb) { | |
1303 | /* packet collected; minidriver waiting for more */ | |
1304 | if (info->flags & FLAG_MULTI_PACKET) | |
1305 | goto not_drop; | |
1306 | netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); | |
1307 | goto drop; | |
1308 | } | |
1309 | } | |
1310 | ||
1311 | if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { | |
1312 | netif_dbg(dev, tx_err, dev->net, "no urb\n"); | |
1313 | goto drop; | |
1314 | } | |
1315 | ||
1316 | entry = (struct skb_data *) skb->cb; | |
1317 | entry->urb = urb; | |
1318 | entry->dev = dev; | |
1319 | ||
1320 | usb_fill_bulk_urb (urb, dev->udev, dev->out, | |
1321 | skb->data, skb->len, tx_complete, skb); | |
1322 | if (dev->can_dma_sg) { | |
1323 | if (build_dma_sg(skb, urb) < 0) | |
1324 | goto drop; | |
1325 | } | |
1326 | length = urb->transfer_buffer_length; | |
1327 | ||
1328 | /* don't assume the hardware handles USB_ZERO_PACKET | |
1329 | * NOTE: strictly conforming cdc-ether devices should expect | |
1330 | * the ZLP here, but ignore the one-byte packet. | |
1331 | * NOTE2: CDC NCM specification is different from CDC ECM when | |
1332 | * handling ZLP/short packets, so cdc_ncm driver will make short | |
1333 | * packet itself if needed. | |
1334 | */ | |
1335 | if (length % dev->maxpacket == 0) { | |
1336 | if (!(info->flags & FLAG_SEND_ZLP)) { | |
1337 | if (!(info->flags & FLAG_MULTI_PACKET)) { | |
1338 | length++; | |
1339 | if (skb_tailroom(skb) && !urb->num_sgs) { | |
1340 | skb->data[skb->len] = 0; | |
1341 | __skb_put(skb, 1); | |
1342 | } else if (urb->num_sgs) | |
1343 | sg_set_buf(&urb->sg[urb->num_sgs++], | |
1344 | dev->padding_pkt, 1); | |
1345 | } | |
1346 | } else | |
1347 | urb->transfer_flags |= URB_ZERO_PACKET; | |
1348 | } | |
1349 | entry->length = urb->transfer_buffer_length = length; | |
1350 | if (!(info->flags & FLAG_MULTI_PACKET)) | |
1351 | usbnet_set_skb_tx_stats(skb, 1); | |
1352 | ||
1353 | spin_lock_irqsave(&dev->txq.lock, flags); | |
1354 | retval = usb_autopm_get_interface_async(dev->intf); | |
1355 | if (retval < 0) { | |
1356 | spin_unlock_irqrestore(&dev->txq.lock, flags); | |
1357 | goto drop; | |
1358 | } | |
1359 | ||
1360 | #ifdef CONFIG_PM | |
1361 | /* if this triggers the device is still a sleep */ | |
1362 | if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { | |
1363 | /* transmission will be done in resume */ | |
1364 | usb_anchor_urb(urb, &dev->deferred); | |
1365 | /* no use to process more packets */ | |
1366 | netif_stop_queue(net); | |
1367 | usb_put_urb(urb); | |
1368 | spin_unlock_irqrestore(&dev->txq.lock, flags); | |
1369 | netdev_dbg(dev->net, "Delaying transmission for resumption\n"); | |
1370 | goto deferred; | |
1371 | } | |
1372 | #endif | |
1373 | ||
1374 | switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { | |
1375 | case -EPIPE: | |
1376 | netif_stop_queue (net); | |
1377 | usbnet_defer_kevent (dev, EVENT_TX_HALT); | |
1378 | usb_autopm_put_interface_async(dev->intf); | |
1379 | break; | |
1380 | default: | |
1381 | usb_autopm_put_interface_async(dev->intf); | |
1382 | netif_dbg(dev, tx_err, dev->net, | |
1383 | "tx: submit urb err %d\n", retval); | |
1384 | break; | |
1385 | case 0: | |
1386 | net->trans_start = jiffies; | |
1387 | __usbnet_queue_skb(&dev->txq, skb, tx_start); | |
1388 | if (dev->txq.qlen >= TX_QLEN (dev)) | |
1389 | netif_stop_queue (net); | |
1390 | } | |
1391 | spin_unlock_irqrestore (&dev->txq.lock, flags); | |
1392 | ||
1393 | if (retval) { | |
1394 | netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); | |
1395 | drop: | |
1396 | dev->net->stats.tx_dropped++; | |
1397 | not_drop: | |
1398 | if (skb) | |
1399 | dev_kfree_skb_any (skb); | |
1400 | if (urb) { | |
1401 | kfree(urb->sg); | |
1402 | usb_free_urb(urb); | |
1403 | } | |
1404 | } else | |
1405 | netif_dbg(dev, tx_queued, dev->net, | |
1406 | "> tx, len %d, type 0x%x\n", length, skb->protocol); | |
1407 | #ifdef CONFIG_PM | |
1408 | deferred: | |
1409 | #endif | |
1410 | return NETDEV_TX_OK; | |
1411 | } | |
1412 | EXPORT_SYMBOL_GPL(usbnet_start_xmit); | |
1413 | ||
1414 | static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) | |
1415 | { | |
1416 | struct urb *urb; | |
1417 | int i; | |
1418 | int ret = 0; | |
1419 | ||
1420 | /* don't refill the queue all at once */ | |
1421 | for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { | |
1422 | urb = usb_alloc_urb(0, flags); | |
1423 | if (urb != NULL) { | |
1424 | ret = rx_submit(dev, urb, flags); | |
1425 | if (ret) | |
1426 | goto err; | |
1427 | } else { | |
1428 | ret = -ENOMEM; | |
1429 | goto err; | |
1430 | } | |
1431 | } | |
1432 | err: | |
1433 | return ret; | |
1434 | } | |
1435 | ||
1436 | /*-------------------------------------------------------------------------*/ | |
1437 | ||
1438 | // tasklet (work deferred from completions, in_irq) or timer | |
1439 | ||
1440 | static void usbnet_bh (unsigned long param) | |
1441 | { | |
1442 | struct usbnet *dev = (struct usbnet *) param; | |
1443 | struct sk_buff *skb; | |
1444 | struct skb_data *entry; | |
1445 | ||
1446 | while ((skb = skb_dequeue (&dev->done))) { | |
1447 | entry = (struct skb_data *) skb->cb; | |
1448 | switch (entry->state) { | |
1449 | case rx_done: | |
1450 | entry->state = rx_cleanup; | |
1451 | rx_process (dev, skb); | |
1452 | continue; | |
1453 | case tx_done: | |
1454 | kfree(entry->urb->sg); | |
1455 | case rx_cleanup: | |
1456 | usb_free_urb (entry->urb); | |
1457 | dev_kfree_skb (skb); | |
1458 | continue; | |
1459 | default: | |
1460 | netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); | |
1461 | } | |
1462 | } | |
1463 | ||
1464 | /* restart RX again after disabling due to high error rate */ | |
1465 | clear_bit(EVENT_RX_KILL, &dev->flags); | |
1466 | ||
1467 | /* waiting for all pending urbs to complete? | |
1468 | * only then can we forgo submitting anew | |
1469 | */ | |
1470 | if (waitqueue_active(&dev->wait)) { | |
1471 | if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) | |
1472 | wake_up_all(&dev->wait); | |
1473 | ||
1474 | // or are we maybe short a few urbs? | |
1475 | } else if (netif_running (dev->net) && | |
1476 | netif_device_present (dev->net) && | |
1477 | netif_carrier_ok(dev->net) && | |
1478 | !timer_pending (&dev->delay) && | |
1479 | !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
1480 | int temp = dev->rxq.qlen; | |
1481 | ||
1482 | if (temp < RX_QLEN(dev)) { | |
1483 | if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) | |
1484 | return; | |
1485 | if (temp != dev->rxq.qlen) | |
1486 | netif_dbg(dev, link, dev->net, | |
1487 | "rxqlen %d --> %d\n", | |
1488 | temp, dev->rxq.qlen); | |
1489 | if (dev->rxq.qlen < RX_QLEN(dev)) | |
1490 | tasklet_schedule (&dev->bh); | |
1491 | } | |
1492 | if (dev->txq.qlen < TX_QLEN (dev)) | |
1493 | netif_wake_queue (dev->net); | |
1494 | } | |
1495 | } | |
1496 | ||
1497 | ||
1498 | /*------------------------------------------------------------------------- | |
1499 | * | |
1500 | * USB Device Driver support | |
1501 | * | |
1502 | *-------------------------------------------------------------------------*/ | |
1503 | ||
1504 | // precondition: never called in_interrupt | |
1505 | ||
1506 | void usbnet_disconnect (struct usb_interface *intf) | |
1507 | { | |
1508 | struct usbnet *dev; | |
1509 | struct usb_device *xdev; | |
1510 | struct net_device *net; | |
1511 | ||
1512 | dev = usb_get_intfdata(intf); | |
1513 | usb_set_intfdata(intf, NULL); | |
1514 | if (!dev) | |
1515 | return; | |
1516 | ||
1517 | xdev = interface_to_usbdev (intf); | |
1518 | ||
1519 | netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", | |
1520 | intf->dev.driver->name, | |
1521 | xdev->bus->bus_name, xdev->devpath, | |
1522 | dev->driver_info->description); | |
1523 | ||
1524 | net = dev->net; | |
1525 | unregister_netdev (net); | |
1526 | ||
1527 | cancel_work_sync(&dev->kevent); | |
1528 | ||
1529 | usb_scuttle_anchored_urbs(&dev->deferred); | |
1530 | ||
1531 | if (dev->driver_info->unbind) | |
1532 | dev->driver_info->unbind (dev, intf); | |
1533 | ||
1534 | usb_kill_urb(dev->interrupt); | |
1535 | usb_free_urb(dev->interrupt); | |
1536 | kfree(dev->padding_pkt); | |
1537 | ||
1538 | free_netdev(net); | |
1539 | } | |
1540 | EXPORT_SYMBOL_GPL(usbnet_disconnect); | |
1541 | ||
1542 | static const struct net_device_ops usbnet_netdev_ops = { | |
1543 | .ndo_open = usbnet_open, | |
1544 | .ndo_stop = usbnet_stop, | |
1545 | .ndo_start_xmit = usbnet_start_xmit, | |
1546 | .ndo_tx_timeout = usbnet_tx_timeout, | |
1547 | .ndo_set_rx_mode = usbnet_set_rx_mode, | |
1548 | .ndo_change_mtu = usbnet_change_mtu, | |
1549 | .ndo_set_mac_address = eth_mac_addr, | |
1550 | .ndo_validate_addr = eth_validate_addr, | |
1551 | }; | |
1552 | ||
1553 | /*-------------------------------------------------------------------------*/ | |
1554 | ||
1555 | // precondition: never called in_interrupt | |
1556 | ||
1557 | static struct device_type wlan_type = { | |
1558 | .name = "wlan", | |
1559 | }; | |
1560 | ||
1561 | static struct device_type wwan_type = { | |
1562 | .name = "wwan", | |
1563 | }; | |
1564 | ||
1565 | int | |
1566 | usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) | |
1567 | { | |
1568 | struct usbnet *dev; | |
1569 | struct net_device *net; | |
1570 | struct usb_host_interface *interface; | |
1571 | struct driver_info *info; | |
1572 | struct usb_device *xdev; | |
1573 | int status; | |
1574 | const char *name; | |
1575 | struct usb_driver *driver = to_usb_driver(udev->dev.driver); | |
1576 | ||
1577 | /* usbnet already took usb runtime pm, so have to enable the feature | |
1578 | * for usb interface, otherwise usb_autopm_get_interface may return | |
1579 | * failure if RUNTIME_PM is enabled. | |
1580 | */ | |
1581 | if (!driver->supports_autosuspend) { | |
1582 | driver->supports_autosuspend = 1; | |
1583 | pm_runtime_enable(&udev->dev); | |
1584 | } | |
1585 | ||
1586 | name = udev->dev.driver->name; | |
1587 | info = (struct driver_info *) prod->driver_info; | |
1588 | if (!info) { | |
1589 | dev_dbg (&udev->dev, "blacklisted by %s\n", name); | |
1590 | return -ENODEV; | |
1591 | } | |
1592 | xdev = interface_to_usbdev (udev); | |
1593 | interface = udev->cur_altsetting; | |
1594 | ||
1595 | status = -ENOMEM; | |
1596 | ||
1597 | // set up our own records | |
1598 | net = alloc_etherdev(sizeof(*dev)); | |
1599 | if (!net) | |
1600 | goto out; | |
1601 | ||
1602 | /* netdev_printk() needs this so do it as early as possible */ | |
1603 | SET_NETDEV_DEV(net, &udev->dev); | |
1604 | ||
1605 | dev = netdev_priv(net); | |
1606 | dev->udev = xdev; | |
1607 | dev->intf = udev; | |
1608 | dev->driver_info = info; | |
1609 | dev->driver_name = name; | |
1610 | dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV | |
1611 | | NETIF_MSG_PROBE | NETIF_MSG_LINK); | |
1612 | init_waitqueue_head(&dev->wait); | |
1613 | skb_queue_head_init (&dev->rxq); | |
1614 | skb_queue_head_init (&dev->txq); | |
1615 | skb_queue_head_init (&dev->done); | |
1616 | skb_queue_head_init(&dev->rxq_pause); | |
1617 | dev->bh.func = usbnet_bh; | |
1618 | dev->bh.data = (unsigned long) dev; | |
1619 | INIT_WORK (&dev->kevent, kevent); | |
1620 | init_usb_anchor(&dev->deferred); | |
1621 | dev->delay.function = usbnet_bh; | |
1622 | dev->delay.data = (unsigned long) dev; | |
1623 | init_timer (&dev->delay); | |
1624 | mutex_init (&dev->phy_mutex); | |
1625 | mutex_init(&dev->interrupt_mutex); | |
1626 | dev->interrupt_count = 0; | |
1627 | ||
1628 | dev->net = net; | |
1629 | strcpy (net->name, "usb%d"); | |
1630 | memcpy (net->dev_addr, node_id, sizeof node_id); | |
1631 | ||
1632 | /* rx and tx sides can use different message sizes; | |
1633 | * bind() should set rx_urb_size in that case. | |
1634 | */ | |
1635 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
1636 | #if 0 | |
1637 | // dma_supported() is deeply broken on almost all architectures | |
1638 | // possible with some EHCI controllers | |
1639 | if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) | |
1640 | net->features |= NETIF_F_HIGHDMA; | |
1641 | #endif | |
1642 | ||
1643 | net->netdev_ops = &usbnet_netdev_ops; | |
1644 | net->watchdog_timeo = TX_TIMEOUT_JIFFIES; | |
1645 | net->ethtool_ops = &usbnet_ethtool_ops; | |
1646 | ||
1647 | // allow device-specific bind/init procedures | |
1648 | // NOTE net->name still not usable ... | |
1649 | if (info->bind) { | |
1650 | status = info->bind (dev, udev); | |
1651 | if (status < 0) | |
1652 | goto out1; | |
1653 | ||
1654 | // heuristic: "usb%d" for links we know are two-host, | |
1655 | // else "eth%d" when there's reasonable doubt. userspace | |
1656 | // can rename the link if it knows better. | |
1657 | if ((dev->driver_info->flags & FLAG_ETHER) != 0 && | |
1658 | ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || | |
1659 | (net->dev_addr [0] & 0x02) == 0)) | |
1660 | strcpy (net->name, "eth%d"); | |
1661 | /* WLAN devices should always be named "wlan%d" */ | |
1662 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) | |
1663 | strcpy(net->name, "wlan%d"); | |
1664 | /* WWAN devices should always be named "wwan%d" */ | |
1665 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) | |
1666 | strcpy(net->name, "wwan%d"); | |
1667 | ||
1668 | /* devices that cannot do ARP */ | |
1669 | if ((dev->driver_info->flags & FLAG_NOARP) != 0) | |
1670 | net->flags |= IFF_NOARP; | |
1671 | ||
1672 | /* maybe the remote can't receive an Ethernet MTU */ | |
1673 | if (net->mtu > (dev->hard_mtu - net->hard_header_len)) | |
1674 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
1675 | } else if (!info->in || !info->out) | |
1676 | status = usbnet_get_endpoints (dev, udev); | |
1677 | else { | |
1678 | dev->in = usb_rcvbulkpipe (xdev, info->in); | |
1679 | dev->out = usb_sndbulkpipe (xdev, info->out); | |
1680 | if (!(info->flags & FLAG_NO_SETINT)) | |
1681 | status = usb_set_interface (xdev, | |
1682 | interface->desc.bInterfaceNumber, | |
1683 | interface->desc.bAlternateSetting); | |
1684 | else | |
1685 | status = 0; | |
1686 | ||
1687 | } | |
1688 | if (status >= 0 && dev->status) | |
1689 | status = init_status (dev, udev); | |
1690 | if (status < 0) | |
1691 | goto out3; | |
1692 | ||
1693 | if (!dev->rx_urb_size) | |
1694 | dev->rx_urb_size = dev->hard_mtu; | |
1695 | dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); | |
1696 | ||
1697 | /* let userspace know we have a random address */ | |
1698 | if (ether_addr_equal(net->dev_addr, node_id)) | |
1699 | net->addr_assign_type = NET_ADDR_RANDOM; | |
1700 | ||
1701 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) | |
1702 | SET_NETDEV_DEVTYPE(net, &wlan_type); | |
1703 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) | |
1704 | SET_NETDEV_DEVTYPE(net, &wwan_type); | |
1705 | ||
1706 | /* initialize max rx_qlen and tx_qlen */ | |
1707 | usbnet_update_max_qlen(dev); | |
1708 | ||
1709 | if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && | |
1710 | !(info->flags & FLAG_MULTI_PACKET)) { | |
1711 | dev->padding_pkt = kzalloc(1, GFP_KERNEL); | |
1712 | if (!dev->padding_pkt) { | |
1713 | status = -ENOMEM; | |
1714 | goto out4; | |
1715 | } | |
1716 | } | |
1717 | ||
1718 | status = register_netdev (net); | |
1719 | if (status) | |
1720 | goto out5; | |
1721 | netif_info(dev, probe, dev->net, | |
1722 | "register '%s' at usb-%s-%s, %s, %pM\n", | |
1723 | udev->dev.driver->name, | |
1724 | xdev->bus->bus_name, xdev->devpath, | |
1725 | dev->driver_info->description, | |
1726 | net->dev_addr); | |
1727 | ||
1728 | // ok, it's ready to go. | |
1729 | usb_set_intfdata (udev, dev); | |
1730 | ||
1731 | netif_device_attach (net); | |
1732 | ||
1733 | if (dev->driver_info->flags & FLAG_LINK_INTR) | |
1734 | usbnet_link_change(dev, 0, 0); | |
1735 | ||
1736 | return 0; | |
1737 | ||
1738 | out5: | |
1739 | kfree(dev->padding_pkt); | |
1740 | out4: | |
1741 | usb_free_urb(dev->interrupt); | |
1742 | out3: | |
1743 | if (info->unbind) | |
1744 | info->unbind (dev, udev); | |
1745 | out1: | |
1746 | free_netdev(net); | |
1747 | out: | |
1748 | return status; | |
1749 | } | |
1750 | EXPORT_SYMBOL_GPL(usbnet_probe); | |
1751 | ||
1752 | /*-------------------------------------------------------------------------*/ | |
1753 | ||
1754 | /* | |
1755 | * suspend the whole driver as soon as the first interface is suspended | |
1756 | * resume only when the last interface is resumed | |
1757 | */ | |
1758 | ||
1759 | int usbnet_suspend (struct usb_interface *intf, pm_message_t message) | |
1760 | { | |
1761 | struct usbnet *dev = usb_get_intfdata(intf); | |
1762 | ||
1763 | if (!dev->suspend_count++) { | |
1764 | spin_lock_irq(&dev->txq.lock); | |
1765 | /* don't autosuspend while transmitting */ | |
1766 | if (dev->txq.qlen && PMSG_IS_AUTO(message)) { | |
1767 | dev->suspend_count--; | |
1768 | spin_unlock_irq(&dev->txq.lock); | |
1769 | return -EBUSY; | |
1770 | } else { | |
1771 | set_bit(EVENT_DEV_ASLEEP, &dev->flags); | |
1772 | spin_unlock_irq(&dev->txq.lock); | |
1773 | } | |
1774 | /* | |
1775 | * accelerate emptying of the rx and queues, to avoid | |
1776 | * having everything error out. | |
1777 | */ | |
1778 | netif_device_detach (dev->net); | |
1779 | usbnet_terminate_urbs(dev); | |
1780 | __usbnet_status_stop_force(dev); | |
1781 | ||
1782 | /* | |
1783 | * reattach so runtime management can use and | |
1784 | * wake the device | |
1785 | */ | |
1786 | netif_device_attach (dev->net); | |
1787 | } | |
1788 | return 0; | |
1789 | } | |
1790 | EXPORT_SYMBOL_GPL(usbnet_suspend); | |
1791 | ||
1792 | int usbnet_resume (struct usb_interface *intf) | |
1793 | { | |
1794 | struct usbnet *dev = usb_get_intfdata(intf); | |
1795 | struct sk_buff *skb; | |
1796 | struct urb *res; | |
1797 | int retval; | |
1798 | ||
1799 | if (!--dev->suspend_count) { | |
1800 | /* resume interrupt URB if it was previously submitted */ | |
1801 | __usbnet_status_start_force(dev, GFP_NOIO); | |
1802 | ||
1803 | spin_lock_irq(&dev->txq.lock); | |
1804 | while ((res = usb_get_from_anchor(&dev->deferred))) { | |
1805 | ||
1806 | skb = (struct sk_buff *)res->context; | |
1807 | retval = usb_submit_urb(res, GFP_ATOMIC); | |
1808 | if (retval < 0) { | |
1809 | dev_kfree_skb_any(skb); | |
1810 | kfree(res->sg); | |
1811 | usb_free_urb(res); | |
1812 | usb_autopm_put_interface_async(dev->intf); | |
1813 | } else { | |
1814 | dev->net->trans_start = jiffies; | |
1815 | __skb_queue_tail(&dev->txq, skb); | |
1816 | } | |
1817 | } | |
1818 | ||
1819 | smp_mb(); | |
1820 | clear_bit(EVENT_DEV_ASLEEP, &dev->flags); | |
1821 | spin_unlock_irq(&dev->txq.lock); | |
1822 | ||
1823 | if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { | |
1824 | /* handle remote wakeup ASAP | |
1825 | * we cannot race against stop | |
1826 | */ | |
1827 | if (netif_device_present(dev->net) && | |
1828 | !timer_pending(&dev->delay) && | |
1829 | !test_bit(EVENT_RX_HALT, &dev->flags)) | |
1830 | rx_alloc_submit(dev, GFP_NOIO); | |
1831 | ||
1832 | if (!(dev->txq.qlen >= TX_QLEN(dev))) | |
1833 | netif_tx_wake_all_queues(dev->net); | |
1834 | tasklet_schedule (&dev->bh); | |
1835 | } | |
1836 | } | |
1837 | ||
1838 | if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) | |
1839 | usb_autopm_get_interface_no_resume(intf); | |
1840 | ||
1841 | return 0; | |
1842 | } | |
1843 | EXPORT_SYMBOL_GPL(usbnet_resume); | |
1844 | ||
1845 | /* | |
1846 | * Either a subdriver implements manage_power, then it is assumed to always | |
1847 | * be ready to be suspended or it reports the readiness to be suspended | |
1848 | * explicitly | |
1849 | */ | |
1850 | void usbnet_device_suggests_idle(struct usbnet *dev) | |
1851 | { | |
1852 | if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { | |
1853 | dev->intf->needs_remote_wakeup = 1; | |
1854 | usb_autopm_put_interface_async(dev->intf); | |
1855 | } | |
1856 | } | |
1857 | EXPORT_SYMBOL(usbnet_device_suggests_idle); | |
1858 | ||
1859 | /* | |
1860 | * For devices that can do without special commands | |
1861 | */ | |
1862 | int usbnet_manage_power(struct usbnet *dev, int on) | |
1863 | { | |
1864 | dev->intf->needs_remote_wakeup = on; | |
1865 | return 0; | |
1866 | } | |
1867 | EXPORT_SYMBOL(usbnet_manage_power); | |
1868 | ||
1869 | void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) | |
1870 | { | |
1871 | /* update link after link is reseted */ | |
1872 | if (link && !need_reset) | |
1873 | netif_carrier_on(dev->net); | |
1874 | else | |
1875 | netif_carrier_off(dev->net); | |
1876 | ||
1877 | if (need_reset && link) | |
1878 | usbnet_defer_kevent(dev, EVENT_LINK_RESET); | |
1879 | else | |
1880 | usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); | |
1881 | } | |
1882 | EXPORT_SYMBOL(usbnet_link_change); | |
1883 | ||
1884 | /*-------------------------------------------------------------------------*/ | |
1885 | static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, | |
1886 | u16 value, u16 index, void *data, u16 size) | |
1887 | { | |
1888 | void *buf = NULL; | |
1889 | int err = -ENOMEM; | |
1890 | ||
1891 | netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" | |
1892 | " value=0x%04x index=0x%04x size=%d\n", | |
1893 | cmd, reqtype, value, index, size); | |
1894 | ||
1895 | if (data) { | |
1896 | buf = kmalloc(size, GFP_KERNEL); | |
1897 | if (!buf) | |
1898 | goto out; | |
1899 | } | |
1900 | ||
1901 | err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), | |
1902 | cmd, reqtype, value, index, buf, size, | |
1903 | USB_CTRL_GET_TIMEOUT); | |
1904 | if (err > 0 && err <= size) | |
1905 | memcpy(data, buf, err); | |
1906 | kfree(buf); | |
1907 | out: | |
1908 | return err; | |
1909 | } | |
1910 | ||
1911 | static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, | |
1912 | u16 value, u16 index, const void *data, | |
1913 | u16 size) | |
1914 | { | |
1915 | void *buf = NULL; | |
1916 | int err = -ENOMEM; | |
1917 | ||
1918 | netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" | |
1919 | " value=0x%04x index=0x%04x size=%d\n", | |
1920 | cmd, reqtype, value, index, size); | |
1921 | ||
1922 | if (data) { | |
1923 | buf = kmemdup(data, size, GFP_KERNEL); | |
1924 | if (!buf) | |
1925 | goto out; | |
1926 | } | |
1927 | ||
1928 | err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
1929 | cmd, reqtype, value, index, buf, size, | |
1930 | USB_CTRL_SET_TIMEOUT); | |
1931 | kfree(buf); | |
1932 | ||
1933 | out: | |
1934 | return err; | |
1935 | } | |
1936 | ||
1937 | /* | |
1938 | * The function can't be called inside suspend/resume callback, | |
1939 | * otherwise deadlock will be caused. | |
1940 | */ | |
1941 | int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, | |
1942 | u16 value, u16 index, void *data, u16 size) | |
1943 | { | |
1944 | int ret; | |
1945 | ||
1946 | if (usb_autopm_get_interface(dev->intf) < 0) | |
1947 | return -ENODEV; | |
1948 | ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, | |
1949 | data, size); | |
1950 | usb_autopm_put_interface(dev->intf); | |
1951 | return ret; | |
1952 | } | |
1953 | EXPORT_SYMBOL_GPL(usbnet_read_cmd); | |
1954 | ||
1955 | /* | |
1956 | * The function can't be called inside suspend/resume callback, | |
1957 | * otherwise deadlock will be caused. | |
1958 | */ | |
1959 | int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, | |
1960 | u16 value, u16 index, const void *data, u16 size) | |
1961 | { | |
1962 | int ret; | |
1963 | ||
1964 | if (usb_autopm_get_interface(dev->intf) < 0) | |
1965 | return -ENODEV; | |
1966 | ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, | |
1967 | data, size); | |
1968 | usb_autopm_put_interface(dev->intf); | |
1969 | return ret; | |
1970 | } | |
1971 | EXPORT_SYMBOL_GPL(usbnet_write_cmd); | |
1972 | ||
1973 | /* | |
1974 | * The function can be called inside suspend/resume callback safely | |
1975 | * and should only be called by suspend/resume callback generally. | |
1976 | */ | |
1977 | int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, | |
1978 | u16 value, u16 index, void *data, u16 size) | |
1979 | { | |
1980 | return __usbnet_read_cmd(dev, cmd, reqtype, value, index, | |
1981 | data, size); | |
1982 | } | |
1983 | EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); | |
1984 | ||
1985 | /* | |
1986 | * The function can be called inside suspend/resume callback safely | |
1987 | * and should only be called by suspend/resume callback generally. | |
1988 | */ | |
1989 | int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, | |
1990 | u16 value, u16 index, const void *data, | |
1991 | u16 size) | |
1992 | { | |
1993 | return __usbnet_write_cmd(dev, cmd, reqtype, value, index, | |
1994 | data, size); | |
1995 | } | |
1996 | EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); | |
1997 | ||
1998 | static void usbnet_async_cmd_cb(struct urb *urb) | |
1999 | { | |
2000 | struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; | |
2001 | int status = urb->status; | |
2002 | ||
2003 | if (status < 0) | |
2004 | dev_dbg(&urb->dev->dev, "%s failed with %d", | |
2005 | __func__, status); | |
2006 | ||
2007 | kfree(req); | |
2008 | usb_free_urb(urb); | |
2009 | } | |
2010 | ||
2011 | /* | |
2012 | * The caller must make sure that device can't be put into suspend | |
2013 | * state until the control URB completes. | |
2014 | */ | |
2015 | int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, | |
2016 | u16 value, u16 index, const void *data, u16 size) | |
2017 | { | |
2018 | struct usb_ctrlrequest *req = NULL; | |
2019 | struct urb *urb; | |
2020 | int err = -ENOMEM; | |
2021 | void *buf = NULL; | |
2022 | ||
2023 | netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" | |
2024 | " value=0x%04x index=0x%04x size=%d\n", | |
2025 | cmd, reqtype, value, index, size); | |
2026 | ||
2027 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
2028 | if (!urb) { | |
2029 | netdev_err(dev->net, "Error allocating URB in" | |
2030 | " %s!\n", __func__); | |
2031 | goto fail; | |
2032 | } | |
2033 | ||
2034 | if (data) { | |
2035 | buf = kmemdup(data, size, GFP_ATOMIC); | |
2036 | if (!buf) { | |
2037 | netdev_err(dev->net, "Error allocating buffer" | |
2038 | " in %s!\n", __func__); | |
2039 | goto fail_free; | |
2040 | } | |
2041 | } | |
2042 | ||
2043 | req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); | |
2044 | if (!req) | |
2045 | goto fail_free_buf; | |
2046 | ||
2047 | req->bRequestType = reqtype; | |
2048 | req->bRequest = cmd; | |
2049 | req->wValue = cpu_to_le16(value); | |
2050 | req->wIndex = cpu_to_le16(index); | |
2051 | req->wLength = cpu_to_le16(size); | |
2052 | ||
2053 | usb_fill_control_urb(urb, dev->udev, | |
2054 | usb_sndctrlpipe(dev->udev, 0), | |
2055 | (void *)req, buf, size, | |
2056 | usbnet_async_cmd_cb, req); | |
2057 | urb->transfer_flags |= URB_FREE_BUFFER; | |
2058 | ||
2059 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
2060 | if (err < 0) { | |
2061 | netdev_err(dev->net, "Error submitting the control" | |
2062 | " message: status=%d\n", err); | |
2063 | goto fail_free; | |
2064 | } | |
2065 | return 0; | |
2066 | ||
2067 | fail_free_buf: | |
2068 | kfree(buf); | |
2069 | fail_free: | |
2070 | kfree(req); | |
2071 | usb_free_urb(urb); | |
2072 | fail: | |
2073 | return err; | |
2074 | ||
2075 | } | |
2076 | EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); | |
2077 | /*-------------------------------------------------------------------------*/ | |
2078 | ||
2079 | static int __init usbnet_init(void) | |
2080 | { | |
2081 | /* Compiler should optimize this out. */ | |
2082 | BUILD_BUG_ON( | |
2083 | FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); | |
2084 | ||
2085 | eth_random_addr(node_id); | |
2086 | return 0; | |
2087 | } | |
2088 | module_init(usbnet_init); | |
2089 | ||
2090 | static void __exit usbnet_exit(void) | |
2091 | { | |
2092 | } | |
2093 | module_exit(usbnet_exit); | |
2094 | ||
2095 | MODULE_AUTHOR("David Brownell"); | |
2096 | MODULE_DESCRIPTION("USB network driver framework"); | |
2097 | MODULE_LICENSE("GPL"); |