Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
090ffa9d | 2 | * USB Network driver infrastructure |
f29fc259 | 3 | * Copyright (C) 2000-2005 by David Brownell |
1da177e4 | 4 | * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> |
1da177e4 LT |
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 | |
090ffa9d DB |
23 | * kinds of full and high speed networking devices: host-to-host cables, |
24 | * smart usb peripherals, and actual Ethernet adapters. | |
1da177e4 | 25 | * |
090ffa9d DB |
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 | */ | |
1da177e4 LT |
32 | |
33 | // #define DEBUG // error path messages, extra info | |
34 | // #define VERBOSE // more; success messages | |
35 | ||
1da177e4 | 36 | #include <linux/module.h> |
1da177e4 LT |
37 | #include <linux/init.h> |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/etherdevice.h> | |
1da177e4 LT |
40 | #include <linux/ethtool.h> |
41 | #include <linux/workqueue.h> | |
42 | #include <linux/mii.h> | |
1da177e4 | 43 | #include <linux/usb.h> |
f29fc259 DB |
44 | |
45 | #include "usbnet.h" | |
46 | ||
47 | #define DRIVER_VERSION "22-Aug-2005" | |
1da177e4 LT |
48 | |
49 | ||
50 | /*-------------------------------------------------------------------------*/ | |
51 | ||
52 | /* | |
53 | * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. | |
54 | * Several dozen bytes of IPv4 data can fit in two such transactions. | |
55 | * One maximum size Ethernet packet takes twenty four of them. | |
56 | * For high speed, each frame comfortably fits almost 36 max size | |
57 | * Ethernet packets (so queues should be bigger). | |
f29fc259 DB |
58 | * |
59 | * REVISIT qlens should be members of 'struct usbnet'; the goal is to | |
60 | * let the USB host controller be busy for 5msec or more before an irq | |
61 | * is required, under load. Jumbograms change the equation. | |
1da177e4 | 62 | */ |
a99c1949 JP |
63 | #define RX_MAX_QUEUE_MEMORY (60 * 1518) |
64 | #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ | |
65 | (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4) | |
66 | #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ | |
67 | (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4) | |
1da177e4 | 68 | |
1da177e4 LT |
69 | // reawaken network queue this soon after stopping; else watchdog barks |
70 | #define TX_TIMEOUT_JIFFIES (5*HZ) | |
71 | ||
72 | // throttle rx/tx briefly after some faults, so khubd might disconnect() | |
73 | // us (it polls at HZ/4 usually) before we report too many false errors. | |
74 | #define THROTTLE_JIFFIES (HZ/8) | |
75 | ||
1da177e4 LT |
76 | // between wakeups |
77 | #define UNLINK_TIMEOUT_MS 3 | |
78 | ||
79 | /*-------------------------------------------------------------------------*/ | |
80 | ||
81 | // randomly generated ethernet address | |
82 | static u8 node_id [ETH_ALEN]; | |
83 | ||
1da177e4 LT |
84 | static const char driver_name [] = "usbnet"; |
85 | ||
86 | /* use ethtool to change the level for any given device */ | |
87 | static int msg_level = -1; | |
88 | module_param (msg_level, int, 0); | |
89 | MODULE_PARM_DESC (msg_level, "Override default message level"); | |
90 | ||
1da177e4 LT |
91 | /*-------------------------------------------------------------------------*/ |
92 | ||
1da177e4 | 93 | /* handles CDC Ethernet and many other network "bulk data" interfaces */ |
2e55cc72 | 94 | int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) |
1da177e4 LT |
95 | { |
96 | int tmp; | |
97 | struct usb_host_interface *alt = NULL; | |
98 | struct usb_host_endpoint *in = NULL, *out = NULL; | |
99 | struct usb_host_endpoint *status = NULL; | |
100 | ||
101 | for (tmp = 0; tmp < intf->num_altsetting; tmp++) { | |
102 | unsigned ep; | |
103 | ||
104 | in = out = status = NULL; | |
105 | alt = intf->altsetting + tmp; | |
106 | ||
107 | /* take the first altsetting with in-bulk + out-bulk; | |
108 | * remember any status endpoint, just in case; | |
109 | * ignore other endpoints and altsetttings. | |
110 | */ | |
111 | for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { | |
112 | struct usb_host_endpoint *e; | |
113 | int intr = 0; | |
114 | ||
115 | e = alt->endpoint + ep; | |
116 | switch (e->desc.bmAttributes) { | |
117 | case USB_ENDPOINT_XFER_INT: | |
fc6e2544 | 118 | if (!usb_endpoint_dir_in(&e->desc)) |
1da177e4 LT |
119 | continue; |
120 | intr = 1; | |
121 | /* FALLTHROUGH */ | |
122 | case USB_ENDPOINT_XFER_BULK: | |
123 | break; | |
124 | default: | |
125 | continue; | |
126 | } | |
fc6e2544 | 127 | if (usb_endpoint_dir_in(&e->desc)) { |
1da177e4 LT |
128 | if (!intr && !in) |
129 | in = e; | |
130 | else if (intr && !status) | |
131 | status = e; | |
132 | } else { | |
133 | if (!out) | |
134 | out = e; | |
135 | } | |
136 | } | |
137 | if (in && out) | |
138 | break; | |
139 | } | |
140 | if (!alt || !in || !out) | |
141 | return -EINVAL; | |
142 | ||
143 | if (alt->desc.bAlternateSetting != 0 | |
144 | || !(dev->driver_info->flags & FLAG_NO_SETINT)) { | |
145 | tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, | |
146 | alt->desc.bAlternateSetting); | |
147 | if (tmp < 0) | |
148 | return tmp; | |
149 | } | |
cb1cebbe | 150 | |
1da177e4 LT |
151 | dev->in = usb_rcvbulkpipe (dev->udev, |
152 | in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
153 | dev->out = usb_sndbulkpipe (dev->udev, | |
154 | out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
155 | dev->status = status; | |
156 | return 0; | |
157 | } | |
2e55cc72 | 158 | EXPORT_SYMBOL_GPL(usbnet_get_endpoints); |
1da177e4 | 159 | |
7d12e780 | 160 | static void intr_complete (struct urb *urb); |
1da177e4 LT |
161 | |
162 | static int init_status (struct usbnet *dev, struct usb_interface *intf) | |
163 | { | |
164 | char *buf = NULL; | |
165 | unsigned pipe = 0; | |
166 | unsigned maxp; | |
167 | unsigned period; | |
168 | ||
169 | if (!dev->driver_info->status) | |
170 | return 0; | |
171 | ||
172 | pipe = usb_rcvintpipe (dev->udev, | |
173 | dev->status->desc.bEndpointAddress | |
174 | & USB_ENDPOINT_NUMBER_MASK); | |
175 | maxp = usb_maxpacket (dev->udev, pipe, 0); | |
176 | ||
177 | /* avoid 1 msec chatter: min 8 msec poll rate */ | |
178 | period = max ((int) dev->status->desc.bInterval, | |
179 | (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); | |
180 | ||
e94b1766 | 181 | buf = kmalloc (maxp, GFP_KERNEL); |
1da177e4 | 182 | if (buf) { |
e94b1766 | 183 | dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); |
1da177e4 LT |
184 | if (!dev->interrupt) { |
185 | kfree (buf); | |
186 | return -ENOMEM; | |
187 | } else { | |
188 | usb_fill_int_urb(dev->interrupt, dev->udev, pipe, | |
189 | buf, maxp, intr_complete, dev, period); | |
190 | dev_dbg(&intf->dev, | |
191 | "status ep%din, %d bytes period %d\n", | |
192 | usb_pipeendpoint(pipe), maxp, period); | |
193 | } | |
194 | } | |
195 | return 0; | |
196 | } | |
197 | ||
2e55cc72 DB |
198 | /* Passes this packet up the stack, updating its accounting. |
199 | * Some link protocols batch packets, so their rx_fixup paths | |
200 | * can return clones as well as just modify the original skb. | |
201 | */ | |
202 | void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) | |
1da177e4 LT |
203 | { |
204 | int status; | |
205 | ||
1da177e4 LT |
206 | skb->protocol = eth_type_trans (skb, dev->net); |
207 | dev->stats.rx_packets++; | |
208 | dev->stats.rx_bytes += skb->len; | |
209 | ||
210 | if (netif_msg_rx_status (dev)) | |
5330e927 | 211 | devdbg (dev, "< rx, len %zu, type 0x%x", |
1da177e4 LT |
212 | skb->len + sizeof (struct ethhdr), skb->protocol); |
213 | memset (skb->cb, 0, sizeof (struct skb_data)); | |
214 | status = netif_rx (skb); | |
215 | if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev)) | |
216 | devdbg (dev, "netif_rx status %d", status); | |
217 | } | |
2e55cc72 | 218 | EXPORT_SYMBOL_GPL(usbnet_skb_return); |
1da177e4 | 219 | |
1da177e4 LT |
220 | \f |
221 | /*------------------------------------------------------------------------- | |
222 | * | |
223 | * Network Device Driver (peer link to "Host Device", from USB host) | |
224 | * | |
225 | *-------------------------------------------------------------------------*/ | |
226 | ||
227 | static int usbnet_change_mtu (struct net_device *net, int new_mtu) | |
228 | { | |
229 | struct usbnet *dev = netdev_priv(net); | |
f29fc259 | 230 | int ll_mtu = new_mtu + net->hard_header_len; |
a99c1949 JP |
231 | int old_hard_mtu = dev->hard_mtu; |
232 | int old_rx_urb_size = dev->rx_urb_size; | |
1da177e4 | 233 | |
a99c1949 | 234 | if (new_mtu <= 0) |
1da177e4 | 235 | return -EINVAL; |
1da177e4 | 236 | // no second zero-length packet read wanted after mtu-sized packets |
f29fc259 | 237 | if ((ll_mtu % dev->maxpacket) == 0) |
1da177e4 LT |
238 | return -EDOM; |
239 | net->mtu = new_mtu; | |
a99c1949 JP |
240 | |
241 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
242 | if (dev->rx_urb_size == old_hard_mtu) { | |
243 | dev->rx_urb_size = dev->hard_mtu; | |
244 | if (dev->rx_urb_size > old_rx_urb_size) | |
245 | usbnet_unlink_rx_urbs(dev); | |
246 | } | |
247 | ||
1da177e4 LT |
248 | return 0; |
249 | } | |
250 | ||
251 | /*-------------------------------------------------------------------------*/ | |
252 | ||
253 | static struct net_device_stats *usbnet_get_stats (struct net_device *net) | |
254 | { | |
255 | struct usbnet *dev = netdev_priv(net); | |
256 | return &dev->stats; | |
257 | } | |
258 | ||
259 | /*-------------------------------------------------------------------------*/ | |
260 | ||
261 | /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from | |
262 | * completion callbacks. 2.5 should have fixed those bugs... | |
263 | */ | |
264 | ||
8728b834 | 265 | static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) |
1da177e4 | 266 | { |
1da177e4 LT |
267 | unsigned long flags; |
268 | ||
8728b834 DM |
269 | spin_lock_irqsave(&list->lock, flags); |
270 | __skb_unlink(skb, list); | |
271 | spin_unlock(&list->lock); | |
272 | spin_lock(&dev->done.lock); | |
273 | __skb_queue_tail(&dev->done, skb); | |
1da177e4 | 274 | if (dev->done.qlen == 1) |
8728b834 DM |
275 | tasklet_schedule(&dev->bh); |
276 | spin_unlock_irqrestore(&dev->done.lock, flags); | |
1da177e4 LT |
277 | } |
278 | ||
279 | /* some work can't be done in tasklets, so we use keventd | |
280 | * | |
281 | * NOTE: annoying asymmetry: if it's active, schedule_work() fails, | |
282 | * but tasklet_schedule() doesn't. hope the failure is rare. | |
283 | */ | |
2e55cc72 | 284 | void usbnet_defer_kevent (struct usbnet *dev, int work) |
1da177e4 LT |
285 | { |
286 | set_bit (work, &dev->flags); | |
287 | if (!schedule_work (&dev->kevent)) | |
288 | deverr (dev, "kevent %d may have been dropped", work); | |
289 | else | |
290 | devdbg (dev, "kevent %d scheduled", work); | |
291 | } | |
2e55cc72 | 292 | EXPORT_SYMBOL_GPL(usbnet_defer_kevent); |
1da177e4 LT |
293 | |
294 | /*-------------------------------------------------------------------------*/ | |
295 | ||
7d12e780 | 296 | static void rx_complete (struct urb *urb); |
1da177e4 | 297 | |
55016f10 | 298 | static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) |
1da177e4 LT |
299 | { |
300 | struct sk_buff *skb; | |
301 | struct skb_data *entry; | |
302 | int retval = 0; | |
303 | unsigned long lockflags; | |
2e55cc72 | 304 | size_t size = dev->rx_urb_size; |
1da177e4 | 305 | |
1da177e4 LT |
306 | if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) { |
307 | if (netif_msg_rx_err (dev)) | |
308 | devdbg (dev, "no rx skb"); | |
2e55cc72 | 309 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
1da177e4 LT |
310 | usb_free_urb (urb); |
311 | return; | |
312 | } | |
313 | skb_reserve (skb, NET_IP_ALIGN); | |
314 | ||
315 | entry = (struct skb_data *) skb->cb; | |
316 | entry->urb = urb; | |
317 | entry->dev = dev; | |
318 | entry->state = rx_start; | |
319 | entry->length = 0; | |
320 | ||
321 | usb_fill_bulk_urb (urb, dev->udev, dev->in, | |
322 | skb->data, size, rx_complete, skb); | |
1da177e4 LT |
323 | |
324 | spin_lock_irqsave (&dev->rxq.lock, lockflags); | |
325 | ||
326 | if (netif_running (dev->net) | |
327 | && netif_device_present (dev->net) | |
328 | && !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
cb1cebbe | 329 | switch (retval = usb_submit_urb (urb, GFP_ATOMIC)){ |
1da177e4 | 330 | case -EPIPE: |
2e55cc72 | 331 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
1da177e4 LT |
332 | break; |
333 | case -ENOMEM: | |
2e55cc72 | 334 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
1da177e4 LT |
335 | break; |
336 | case -ENODEV: | |
337 | if (netif_msg_ifdown (dev)) | |
338 | devdbg (dev, "device gone"); | |
339 | netif_device_detach (dev->net); | |
340 | break; | |
341 | default: | |
342 | if (netif_msg_rx_err (dev)) | |
343 | devdbg (dev, "rx submit, %d", retval); | |
344 | tasklet_schedule (&dev->bh); | |
345 | break; | |
346 | case 0: | |
347 | __skb_queue_tail (&dev->rxq, skb); | |
348 | } | |
349 | } else { | |
350 | if (netif_msg_ifdown (dev)) | |
351 | devdbg (dev, "rx: stopped"); | |
352 | retval = -ENOLINK; | |
353 | } | |
354 | spin_unlock_irqrestore (&dev->rxq.lock, lockflags); | |
355 | if (retval) { | |
356 | dev_kfree_skb_any (skb); | |
357 | usb_free_urb (urb); | |
358 | } | |
359 | } | |
360 | ||
361 | ||
362 | /*-------------------------------------------------------------------------*/ | |
363 | ||
364 | static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) | |
365 | { | |
366 | if (dev->driver_info->rx_fixup | |
367 | && !dev->driver_info->rx_fixup (dev, skb)) | |
368 | goto error; | |
369 | // else network stack removes extra byte if we forced a short packet | |
370 | ||
371 | if (skb->len) | |
2e55cc72 | 372 | usbnet_skb_return (dev, skb); |
1da177e4 LT |
373 | else { |
374 | if (netif_msg_rx_err (dev)) | |
375 | devdbg (dev, "drop"); | |
376 | error: | |
377 | dev->stats.rx_errors++; | |
378 | skb_queue_tail (&dev->done, skb); | |
379 | } | |
380 | } | |
381 | ||
382 | /*-------------------------------------------------------------------------*/ | |
383 | ||
7d12e780 | 384 | static void rx_complete (struct urb *urb) |
1da177e4 LT |
385 | { |
386 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
387 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
388 | struct usbnet *dev = entry->dev; | |
389 | int urb_status = urb->status; | |
390 | ||
391 | skb_put (skb, urb->actual_length); | |
392 | entry->state = rx_done; | |
393 | entry->urb = NULL; | |
394 | ||
395 | switch (urb_status) { | |
396 | // success | |
397 | case 0: | |
f29fc259 | 398 | if (skb->len < dev->net->hard_header_len) { |
1da177e4 LT |
399 | entry->state = rx_cleanup; |
400 | dev->stats.rx_errors++; | |
401 | dev->stats.rx_length_errors++; | |
402 | if (netif_msg_rx_err (dev)) | |
403 | devdbg (dev, "rx length %d", skb->len); | |
404 | } | |
405 | break; | |
406 | ||
407 | // stalls need manual reset. this is rare ... except that | |
408 | // when going through USB 2.0 TTs, unplug appears this way. | |
409 | // we avoid the highspeed version of the ETIMEOUT/EILSEQ | |
410 | // storm, recovering as needed. | |
411 | case -EPIPE: | |
412 | dev->stats.rx_errors++; | |
2e55cc72 | 413 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
1da177e4 LT |
414 | // FALLTHROUGH |
415 | ||
416 | // software-driven interface shutdown | |
417 | case -ECONNRESET: // async unlink | |
418 | case -ESHUTDOWN: // hardware gone | |
419 | if (netif_msg_ifdown (dev)) | |
420 | devdbg (dev, "rx shutdown, code %d", urb_status); | |
421 | goto block; | |
422 | ||
423 | // we get controller i/o faults during khubd disconnect() delays. | |
424 | // throttle down resubmits, to avoid log floods; just temporarily, | |
425 | // so we still recover when the fault isn't a khubd delay. | |
38e2bfc9 PZ |
426 | case -EPROTO: |
427 | case -ETIME: | |
428 | case -EILSEQ: | |
1da177e4 LT |
429 | dev->stats.rx_errors++; |
430 | if (!timer_pending (&dev->delay)) { | |
431 | mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); | |
432 | if (netif_msg_link (dev)) | |
433 | devdbg (dev, "rx throttle %d", urb_status); | |
434 | } | |
435 | block: | |
436 | entry->state = rx_cleanup; | |
437 | entry->urb = urb; | |
438 | urb = NULL; | |
439 | break; | |
440 | ||
441 | // data overrun ... flush fifo? | |
442 | case -EOVERFLOW: | |
443 | dev->stats.rx_over_errors++; | |
444 | // FALLTHROUGH | |
cb1cebbe | 445 | |
1da177e4 LT |
446 | default: |
447 | entry->state = rx_cleanup; | |
448 | dev->stats.rx_errors++; | |
449 | if (netif_msg_rx_err (dev)) | |
450 | devdbg (dev, "rx status %d", urb_status); | |
451 | break; | |
452 | } | |
453 | ||
8728b834 | 454 | defer_bh(dev, skb, &dev->rxq); |
1da177e4 LT |
455 | |
456 | if (urb) { | |
457 | if (netif_running (dev->net) | |
458 | && !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
459 | rx_submit (dev, urb, GFP_ATOMIC); | |
460 | return; | |
461 | } | |
462 | usb_free_urb (urb); | |
463 | } | |
464 | if (netif_msg_rx_err (dev)) | |
465 | devdbg (dev, "no read resubmitted"); | |
466 | } | |
467 | ||
7d12e780 | 468 | static void intr_complete (struct urb *urb) |
1da177e4 LT |
469 | { |
470 | struct usbnet *dev = urb->context; | |
471 | int status = urb->status; | |
472 | ||
473 | switch (status) { | |
474 | /* success */ | |
475 | case 0: | |
476 | dev->driver_info->status(dev, urb); | |
477 | break; | |
478 | ||
479 | /* software-driven interface shutdown */ | |
480 | case -ENOENT: // urb killed | |
481 | case -ESHUTDOWN: // hardware gone | |
482 | if (netif_msg_ifdown (dev)) | |
483 | devdbg (dev, "intr shutdown, code %d", status); | |
484 | return; | |
485 | ||
486 | /* NOTE: not throttling like RX/TX, since this endpoint | |
487 | * already polls infrequently | |
488 | */ | |
489 | default: | |
490 | devdbg (dev, "intr status %d", status); | |
491 | break; | |
492 | } | |
493 | ||
494 | if (!netif_running (dev->net)) | |
495 | return; | |
496 | ||
497 | memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); | |
498 | status = usb_submit_urb (urb, GFP_ATOMIC); | |
499 | if (status != 0 && netif_msg_timer (dev)) | |
500 | deverr(dev, "intr resubmit --> %d", status); | |
501 | } | |
502 | ||
503 | /*-------------------------------------------------------------------------*/ | |
504 | ||
505 | // unlink pending rx/tx; completion handlers do all other cleanup | |
506 | ||
507 | static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) | |
508 | { | |
509 | unsigned long flags; | |
510 | struct sk_buff *skb, *skbnext; | |
511 | int count = 0; | |
512 | ||
513 | spin_lock_irqsave (&q->lock, flags); | |
514 | for (skb = q->next; skb != (struct sk_buff *) q; skb = skbnext) { | |
515 | struct skb_data *entry; | |
516 | struct urb *urb; | |
517 | int retval; | |
518 | ||
519 | entry = (struct skb_data *) skb->cb; | |
520 | urb = entry->urb; | |
521 | skbnext = skb->next; | |
522 | ||
523 | // during some PM-driven resume scenarios, | |
524 | // these (async) unlinks complete immediately | |
525 | retval = usb_unlink_urb (urb); | |
526 | if (retval != -EINPROGRESS && retval != 0) | |
527 | devdbg (dev, "unlink urb err, %d", retval); | |
528 | else | |
529 | count++; | |
530 | } | |
531 | spin_unlock_irqrestore (&q->lock, flags); | |
532 | return count; | |
533 | } | |
534 | ||
a99c1949 JP |
535 | // Flush all pending rx urbs |
536 | // minidrivers may need to do this when the MTU changes | |
537 | ||
538 | void usbnet_unlink_rx_urbs(struct usbnet *dev) | |
539 | { | |
540 | if (netif_running(dev->net)) { | |
541 | (void) unlink_urbs (dev, &dev->rxq); | |
542 | tasklet_schedule(&dev->bh); | |
543 | } | |
544 | } | |
545 | EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); | |
1da177e4 LT |
546 | |
547 | /*-------------------------------------------------------------------------*/ | |
548 | ||
549 | // precondition: never called in_interrupt | |
550 | ||
551 | static int usbnet_stop (struct net_device *net) | |
552 | { | |
553 | struct usbnet *dev = netdev_priv(net); | |
554 | int temp; | |
7259f0d0 | 555 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup); |
1da177e4 LT |
556 | DECLARE_WAITQUEUE (wait, current); |
557 | ||
558 | netif_stop_queue (net); | |
559 | ||
560 | if (netif_msg_ifdown (dev)) | |
561 | devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld", | |
cb1cebbe | 562 | dev->stats.rx_packets, dev->stats.tx_packets, |
1da177e4 LT |
563 | dev->stats.rx_errors, dev->stats.tx_errors |
564 | ); | |
565 | ||
566 | // ensure there are no more active urbs | |
567 | add_wait_queue (&unlink_wakeup, &wait); | |
568 | dev->wait = &unlink_wakeup; | |
569 | temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq); | |
570 | ||
571 | // maybe wait for deletions to finish. | |
b03efcfb DM |
572 | while (!skb_queue_empty(&dev->rxq) && |
573 | !skb_queue_empty(&dev->txq) && | |
574 | !skb_queue_empty(&dev->done)) { | |
1da177e4 LT |
575 | msleep(UNLINK_TIMEOUT_MS); |
576 | if (netif_msg_ifdown (dev)) | |
577 | devdbg (dev, "waited for %d urb completions", temp); | |
578 | } | |
579 | dev->wait = NULL; | |
cb1cebbe | 580 | remove_wait_queue (&unlink_wakeup, &wait); |
1da177e4 LT |
581 | |
582 | usb_kill_urb(dev->interrupt); | |
583 | ||
584 | /* deferred work (task, timer, softirq) must also stop. | |
585 | * can't flush_scheduled_work() until we drop rtnl (later), | |
586 | * else workers could deadlock; so make workers a NOP. | |
587 | */ | |
588 | dev->flags = 0; | |
589 | del_timer_sync (&dev->delay); | |
590 | tasklet_kill (&dev->bh); | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | /*-------------------------------------------------------------------------*/ | |
596 | ||
597 | // posts reads, and enables write queuing | |
598 | ||
599 | // precondition: never called in_interrupt | |
600 | ||
601 | static int usbnet_open (struct net_device *net) | |
602 | { | |
603 | struct usbnet *dev = netdev_priv(net); | |
604 | int retval = 0; | |
605 | struct driver_info *info = dev->driver_info; | |
606 | ||
607 | // put into "known safe" state | |
608 | if (info->reset && (retval = info->reset (dev)) < 0) { | |
609 | if (netif_msg_ifup (dev)) | |
610 | devinfo (dev, | |
611 | "open reset fail (%d) usbnet usb-%s-%s, %s", | |
612 | retval, | |
613 | dev->udev->bus->bus_name, dev->udev->devpath, | |
614 | info->description); | |
615 | goto done; | |
616 | } | |
617 | ||
618 | // insist peer be connected | |
619 | if (info->check_connect && (retval = info->check_connect (dev)) < 0) { | |
620 | if (netif_msg_ifup (dev)) | |
621 | devdbg (dev, "can't open; %d", retval); | |
622 | goto done; | |
623 | } | |
624 | ||
625 | /* start any status interrupt transfer */ | |
626 | if (dev->interrupt) { | |
627 | retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); | |
628 | if (retval < 0) { | |
629 | if (netif_msg_ifup (dev)) | |
630 | deverr (dev, "intr submit %d", retval); | |
631 | goto done; | |
632 | } | |
633 | } | |
634 | ||
635 | netif_start_queue (net); | |
636 | if (netif_msg_ifup (dev)) { | |
637 | char *framing; | |
638 | ||
639 | if (dev->driver_info->flags & FLAG_FRAMING_NC) | |
640 | framing = "NetChip"; | |
641 | else if (dev->driver_info->flags & FLAG_FRAMING_GL) | |
642 | framing = "GeneSys"; | |
643 | else if (dev->driver_info->flags & FLAG_FRAMING_Z) | |
644 | framing = "Zaurus"; | |
645 | else if (dev->driver_info->flags & FLAG_FRAMING_RN) | |
646 | framing = "RNDIS"; | |
647 | else if (dev->driver_info->flags & FLAG_FRAMING_AX) | |
648 | framing = "ASIX"; | |
649 | else | |
650 | framing = "simple"; | |
651 | ||
652 | devinfo (dev, "open: enable queueing " | |
653 | "(rx %d, tx %d) mtu %d %s framing", | |
25d94e68 | 654 | (int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu, |
1da177e4 LT |
655 | framing); |
656 | } | |
657 | ||
658 | // delay posting reads until we're fully open | |
659 | tasklet_schedule (&dev->bh); | |
660 | done: | |
661 | return retval; | |
662 | } | |
663 | ||
664 | /*-------------------------------------------------------------------------*/ | |
665 | ||
2e55cc72 DB |
666 | /* ethtool methods; minidrivers may need to add some more, but |
667 | * they'll probably want to use this base set. | |
668 | */ | |
669 | ||
18ee91fa DB |
670 | #if defined(CONFIG_MII) || defined(CONFIG_MII_MODULE) |
671 | #define HAVE_MII | |
672 | ||
c41286fd AB |
673 | int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) |
674 | { | |
675 | struct usbnet *dev = netdev_priv(net); | |
676 | ||
677 | if (!dev->mii.mdio_read) | |
678 | return -EOPNOTSUPP; | |
679 | ||
680 | return mii_ethtool_gset(&dev->mii, cmd); | |
681 | } | |
682 | EXPORT_SYMBOL_GPL(usbnet_get_settings); | |
683 | ||
684 | int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) | |
685 | { | |
686 | struct usbnet *dev = netdev_priv(net); | |
687 | int retval; | |
688 | ||
689 | if (!dev->mii.mdio_write) | |
690 | return -EOPNOTSUPP; | |
691 | ||
692 | retval = mii_ethtool_sset(&dev->mii, cmd); | |
693 | ||
694 | /* link speed/duplex might have changed */ | |
695 | if (dev->driver_info->link_reset) | |
696 | dev->driver_info->link_reset(dev); | |
697 | ||
698 | return retval; | |
699 | ||
700 | } | |
701 | EXPORT_SYMBOL_GPL(usbnet_set_settings); | |
702 | ||
c41286fd | 703 | u32 usbnet_get_link (struct net_device *net) |
1da177e4 LT |
704 | { |
705 | struct usbnet *dev = netdev_priv(net); | |
706 | ||
f29fc259 | 707 | /* If a check_connect is defined, return its result */ |
1da177e4 LT |
708 | if (dev->driver_info->check_connect) |
709 | return dev->driver_info->check_connect (dev) == 0; | |
710 | ||
c41286fd AB |
711 | /* if the device has mii operations, use those */ |
712 | if (dev->mii.mdio_read) | |
713 | return mii_link_ok(&dev->mii); | |
714 | ||
f29fc259 | 715 | /* Otherwise, say we're up (to avoid breaking scripts) */ |
1da177e4 LT |
716 | return 1; |
717 | } | |
c41286fd | 718 | EXPORT_SYMBOL_GPL(usbnet_get_link); |
1da177e4 | 719 | |
18ee91fa | 720 | int usbnet_nway_reset(struct net_device *net) |
1da177e4 LT |
721 | { |
722 | struct usbnet *dev = netdev_priv(net); | |
723 | ||
18ee91fa DB |
724 | if (!dev->mii.mdio_write) |
725 | return -EOPNOTSUPP; | |
726 | ||
727 | return mii_nway_restart(&dev->mii); | |
1da177e4 | 728 | } |
18ee91fa | 729 | EXPORT_SYMBOL_GPL(usbnet_nway_reset); |
1da177e4 | 730 | |
18ee91fa DB |
731 | #endif /* HAVE_MII */ |
732 | ||
733 | void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) | |
1da177e4 LT |
734 | { |
735 | struct usbnet *dev = netdev_priv(net); | |
736 | ||
296c0242 | 737 | strncpy (info->driver, dev->driver_name, sizeof info->driver); |
18ee91fa DB |
738 | strncpy (info->version, DRIVER_VERSION, sizeof info->version); |
739 | strncpy (info->fw_version, dev->driver_info->description, | |
740 | sizeof info->fw_version); | |
741 | usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); | |
1da177e4 | 742 | } |
18ee91fa | 743 | EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); |
1da177e4 | 744 | |
18ee91fa | 745 | u32 usbnet_get_msglevel (struct net_device *net) |
c41286fd AB |
746 | { |
747 | struct usbnet *dev = netdev_priv(net); | |
748 | ||
18ee91fa DB |
749 | return dev->msg_enable; |
750 | } | |
751 | EXPORT_SYMBOL_GPL(usbnet_get_msglevel); | |
c41286fd | 752 | |
18ee91fa DB |
753 | void usbnet_set_msglevel (struct net_device *net, u32 level) |
754 | { | |
755 | struct usbnet *dev = netdev_priv(net); | |
756 | ||
757 | dev->msg_enable = level; | |
c41286fd | 758 | } |
18ee91fa | 759 | EXPORT_SYMBOL_GPL(usbnet_set_msglevel); |
c41286fd | 760 | |
2e55cc72 DB |
761 | /* drivers may override default ethtool_ops in their bind() routine */ |
762 | static struct ethtool_ops usbnet_ethtool_ops = { | |
18ee91fa | 763 | #ifdef HAVE_MII |
c41286fd AB |
764 | .get_settings = usbnet_get_settings, |
765 | .set_settings = usbnet_set_settings, | |
2e55cc72 | 766 | .get_link = usbnet_get_link, |
c41286fd | 767 | .nway_reset = usbnet_nway_reset, |
18ee91fa DB |
768 | #endif |
769 | .get_drvinfo = usbnet_get_drvinfo, | |
2e55cc72 DB |
770 | .get_msglevel = usbnet_get_msglevel, |
771 | .set_msglevel = usbnet_set_msglevel, | |
772 | }; | |
1da177e4 LT |
773 | |
774 | /*-------------------------------------------------------------------------*/ | |
775 | ||
776 | /* work that cannot be done in interrupt context uses keventd. | |
777 | * | |
778 | * NOTE: with 2.5 we could do more of this using completion callbacks, | |
779 | * especially now that control transfers can be queued. | |
780 | */ | |
781 | static void | |
c4028958 | 782 | kevent (struct work_struct *work) |
1da177e4 | 783 | { |
c4028958 DH |
784 | struct usbnet *dev = |
785 | container_of(work, struct usbnet, kevent); | |
1da177e4 LT |
786 | int status; |
787 | ||
788 | /* usb_clear_halt() needs a thread context */ | |
789 | if (test_bit (EVENT_TX_HALT, &dev->flags)) { | |
790 | unlink_urbs (dev, &dev->txq); | |
791 | status = usb_clear_halt (dev->udev, dev->out); | |
f29fc259 DB |
792 | if (status < 0 |
793 | && status != -EPIPE | |
794 | && status != -ESHUTDOWN) { | |
1da177e4 LT |
795 | if (netif_msg_tx_err (dev)) |
796 | deverr (dev, "can't clear tx halt, status %d", | |
797 | status); | |
798 | } else { | |
799 | clear_bit (EVENT_TX_HALT, &dev->flags); | |
f29fc259 DB |
800 | if (status != -ESHUTDOWN) |
801 | netif_wake_queue (dev->net); | |
1da177e4 LT |
802 | } |
803 | } | |
804 | if (test_bit (EVENT_RX_HALT, &dev->flags)) { | |
805 | unlink_urbs (dev, &dev->rxq); | |
806 | status = usb_clear_halt (dev->udev, dev->in); | |
f29fc259 DB |
807 | if (status < 0 |
808 | && status != -EPIPE | |
809 | && status != -ESHUTDOWN) { | |
1da177e4 LT |
810 | if (netif_msg_rx_err (dev)) |
811 | deverr (dev, "can't clear rx halt, status %d", | |
812 | status); | |
813 | } else { | |
814 | clear_bit (EVENT_RX_HALT, &dev->flags); | |
815 | tasklet_schedule (&dev->bh); | |
816 | } | |
817 | } | |
818 | ||
819 | /* tasklet could resubmit itself forever if memory is tight */ | |
820 | if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { | |
821 | struct urb *urb = NULL; | |
822 | ||
823 | if (netif_running (dev->net)) | |
824 | urb = usb_alloc_urb (0, GFP_KERNEL); | |
825 | else | |
826 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
827 | if (urb != NULL) { | |
828 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
829 | rx_submit (dev, urb, GFP_KERNEL); | |
830 | tasklet_schedule (&dev->bh); | |
831 | } | |
832 | } | |
833 | ||
7ea13c9c | 834 | if (test_bit (EVENT_LINK_RESET, &dev->flags)) { |
cb1cebbe | 835 | struct driver_info *info = dev->driver_info; |
7ea13c9c DH |
836 | int retval = 0; |
837 | ||
838 | clear_bit (EVENT_LINK_RESET, &dev->flags); | |
839 | if(info->link_reset && (retval = info->link_reset(dev)) < 0) { | |
840 | devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s", | |
841 | retval, | |
842 | dev->udev->bus->bus_name, dev->udev->devpath, | |
843 | info->description); | |
844 | } | |
845 | } | |
846 | ||
1da177e4 LT |
847 | if (dev->flags) |
848 | devdbg (dev, "kevent done, flags = 0x%lx", | |
849 | dev->flags); | |
850 | } | |
851 | ||
852 | /*-------------------------------------------------------------------------*/ | |
853 | ||
7d12e780 | 854 | static void tx_complete (struct urb *urb) |
1da177e4 LT |
855 | { |
856 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
857 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
858 | struct usbnet *dev = entry->dev; | |
859 | ||
860 | if (urb->status == 0) { | |
861 | dev->stats.tx_packets++; | |
862 | dev->stats.tx_bytes += entry->length; | |
863 | } else { | |
864 | dev->stats.tx_errors++; | |
865 | ||
866 | switch (urb->status) { | |
867 | case -EPIPE: | |
2e55cc72 | 868 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
1da177e4 LT |
869 | break; |
870 | ||
871 | /* software-driven interface shutdown */ | |
872 | case -ECONNRESET: // async unlink | |
873 | case -ESHUTDOWN: // hardware gone | |
874 | break; | |
875 | ||
876 | // like rx, tx gets controller i/o faults during khubd delays | |
877 | // and so it uses the same throttling mechanism. | |
38e2bfc9 PZ |
878 | case -EPROTO: |
879 | case -ETIME: | |
880 | case -EILSEQ: | |
1da177e4 LT |
881 | if (!timer_pending (&dev->delay)) { |
882 | mod_timer (&dev->delay, | |
883 | jiffies + THROTTLE_JIFFIES); | |
884 | if (netif_msg_link (dev)) | |
885 | devdbg (dev, "tx throttle %d", | |
886 | urb->status); | |
887 | } | |
888 | netif_stop_queue (dev->net); | |
889 | break; | |
890 | default: | |
891 | if (netif_msg_tx_err (dev)) | |
892 | devdbg (dev, "tx err %d", entry->urb->status); | |
893 | break; | |
894 | } | |
895 | } | |
896 | ||
897 | urb->dev = NULL; | |
898 | entry->state = tx_done; | |
8728b834 | 899 | defer_bh(dev, skb, &dev->txq); |
1da177e4 LT |
900 | } |
901 | ||
902 | /*-------------------------------------------------------------------------*/ | |
903 | ||
904 | static void usbnet_tx_timeout (struct net_device *net) | |
905 | { | |
906 | struct usbnet *dev = netdev_priv(net); | |
907 | ||
908 | unlink_urbs (dev, &dev->txq); | |
909 | tasklet_schedule (&dev->bh); | |
910 | ||
911 | // FIXME: device recovery -- reset? | |
912 | } | |
913 | ||
914 | /*-------------------------------------------------------------------------*/ | |
915 | ||
916 | static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net) | |
917 | { | |
918 | struct usbnet *dev = netdev_priv(net); | |
919 | int length; | |
920 | int retval = NET_XMIT_SUCCESS; | |
921 | struct urb *urb = NULL; | |
922 | struct skb_data *entry; | |
923 | struct driver_info *info = dev->driver_info; | |
924 | unsigned long flags; | |
1da177e4 LT |
925 | |
926 | // some devices want funky USB-level framing, for | |
927 | // win32 driver (usually) and/or hardware quirks | |
928 | if (info->tx_fixup) { | |
929 | skb = info->tx_fixup (dev, skb, GFP_ATOMIC); | |
930 | if (!skb) { | |
931 | if (netif_msg_tx_err (dev)) | |
932 | devdbg (dev, "can't tx_fixup skb"); | |
933 | goto drop; | |
934 | } | |
935 | } | |
936 | length = skb->len; | |
937 | ||
938 | if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { | |
939 | if (netif_msg_tx_err (dev)) | |
940 | devdbg (dev, "no urb"); | |
941 | goto drop; | |
942 | } | |
943 | ||
944 | entry = (struct skb_data *) skb->cb; | |
945 | entry->urb = urb; | |
946 | entry->dev = dev; | |
947 | entry->state = tx_start; | |
948 | entry->length = length; | |
949 | ||
1da177e4 LT |
950 | usb_fill_bulk_urb (urb, dev->udev, dev->out, |
951 | skb->data, skb->len, tx_complete, skb); | |
1da177e4 LT |
952 | |
953 | /* don't assume the hardware handles USB_ZERO_PACKET | |
954 | * NOTE: strictly conforming cdc-ether devices should expect | |
955 | * the ZLP here, but ignore the one-byte packet. | |
1da177e4 | 956 | */ |
3e323f3e | 957 | if ((length % dev->maxpacket) == 0) { |
1da177e4 | 958 | urb->transfer_buffer_length++; |
3e323f3e PK |
959 | if (skb_tailroom(skb)) { |
960 | skb->data[skb->len] = 0; | |
961 | __skb_put(skb, 1); | |
962 | } | |
963 | } | |
1da177e4 LT |
964 | |
965 | spin_lock_irqsave (&dev->txq.lock, flags); | |
966 | ||
1da177e4 LT |
967 | switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { |
968 | case -EPIPE: | |
969 | netif_stop_queue (net); | |
2e55cc72 | 970 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
1da177e4 LT |
971 | break; |
972 | default: | |
973 | if (netif_msg_tx_err (dev)) | |
974 | devdbg (dev, "tx: submit urb err %d", retval); | |
975 | break; | |
976 | case 0: | |
977 | net->trans_start = jiffies; | |
978 | __skb_queue_tail (&dev->txq, skb); | |
979 | if (dev->txq.qlen >= TX_QLEN (dev)) | |
980 | netif_stop_queue (net); | |
981 | } | |
982 | spin_unlock_irqrestore (&dev->txq.lock, flags); | |
983 | ||
984 | if (retval) { | |
985 | if (netif_msg_tx_err (dev)) | |
986 | devdbg (dev, "drop, code %d", retval); | |
987 | drop: | |
988 | retval = NET_XMIT_SUCCESS; | |
989 | dev->stats.tx_dropped++; | |
990 | if (skb) | |
991 | dev_kfree_skb_any (skb); | |
992 | usb_free_urb (urb); | |
993 | } else if (netif_msg_tx_queued (dev)) { | |
994 | devdbg (dev, "> tx, len %d, type 0x%x", | |
995 | length, skb->protocol); | |
996 | } | |
997 | return retval; | |
998 | } | |
999 | ||
1000 | ||
1001 | /*-------------------------------------------------------------------------*/ | |
1002 | ||
1003 | // tasklet (work deferred from completions, in_irq) or timer | |
1004 | ||
1005 | static void usbnet_bh (unsigned long param) | |
1006 | { | |
1007 | struct usbnet *dev = (struct usbnet *) param; | |
1008 | struct sk_buff *skb; | |
1009 | struct skb_data *entry; | |
1010 | ||
1011 | while ((skb = skb_dequeue (&dev->done))) { | |
1012 | entry = (struct skb_data *) skb->cb; | |
1013 | switch (entry->state) { | |
1014 | case rx_done: | |
1015 | entry->state = rx_cleanup; | |
1016 | rx_process (dev, skb); | |
1017 | continue; | |
1018 | case tx_done: | |
1019 | case rx_cleanup: | |
1020 | usb_free_urb (entry->urb); | |
1021 | dev_kfree_skb (skb); | |
1022 | continue; | |
1023 | default: | |
1024 | devdbg (dev, "bogus skb state %d", entry->state); | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | // waiting for all pending urbs to complete? | |
1029 | if (dev->wait) { | |
1030 | if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { | |
1031 | wake_up (dev->wait); | |
1032 | } | |
1033 | ||
1034 | // or are we maybe short a few urbs? | |
1035 | } else if (netif_running (dev->net) | |
1036 | && netif_device_present (dev->net) | |
1037 | && !timer_pending (&dev->delay) | |
1038 | && !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
1039 | int temp = dev->rxq.qlen; | |
1040 | int qlen = RX_QLEN (dev); | |
1041 | ||
1042 | if (temp < qlen) { | |
1043 | struct urb *urb; | |
1044 | int i; | |
1045 | ||
1046 | // don't refill the queue all at once | |
1047 | for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { | |
1048 | urb = usb_alloc_urb (0, GFP_ATOMIC); | |
1049 | if (urb != NULL) | |
1050 | rx_submit (dev, urb, GFP_ATOMIC); | |
1051 | } | |
1052 | if (temp != dev->rxq.qlen && netif_msg_link (dev)) | |
1053 | devdbg (dev, "rxqlen %d --> %d", | |
1054 | temp, dev->rxq.qlen); | |
1055 | if (dev->rxq.qlen < qlen) | |
1056 | tasklet_schedule (&dev->bh); | |
1057 | } | |
1058 | if (dev->txq.qlen < TX_QLEN (dev)) | |
1059 | netif_wake_queue (dev->net); | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | ||
1064 | \f | |
1065 | /*------------------------------------------------------------------------- | |
1066 | * | |
1067 | * USB Device Driver support | |
1068 | * | |
1069 | *-------------------------------------------------------------------------*/ | |
cb1cebbe | 1070 | |
1da177e4 LT |
1071 | // precondition: never called in_interrupt |
1072 | ||
38bde1d4 | 1073 | void usbnet_disconnect (struct usb_interface *intf) |
1da177e4 LT |
1074 | { |
1075 | struct usbnet *dev; | |
1076 | struct usb_device *xdev; | |
1077 | struct net_device *net; | |
1078 | ||
1079 | dev = usb_get_intfdata(intf); | |
1080 | usb_set_intfdata(intf, NULL); | |
1081 | if (!dev) | |
1082 | return; | |
1083 | ||
1084 | xdev = interface_to_usbdev (intf); | |
1085 | ||
1086 | if (netif_msg_probe (dev)) | |
38bde1d4 DB |
1087 | devinfo (dev, "unregister '%s' usb-%s-%s, %s", |
1088 | intf->dev.driver->name, | |
1da177e4 LT |
1089 | xdev->bus->bus_name, xdev->devpath, |
1090 | dev->driver_info->description); | |
cb1cebbe | 1091 | |
1da177e4 LT |
1092 | net = dev->net; |
1093 | unregister_netdev (net); | |
1094 | ||
1095 | /* we don't hold rtnl here ... */ | |
1096 | flush_scheduled_work (); | |
1097 | ||
1098 | if (dev->driver_info->unbind) | |
1099 | dev->driver_info->unbind (dev, intf); | |
1100 | ||
1101 | free_netdev(net); | |
1102 | usb_put_dev (xdev); | |
1103 | } | |
38bde1d4 | 1104 | EXPORT_SYMBOL_GPL(usbnet_disconnect); |
1da177e4 LT |
1105 | |
1106 | ||
1107 | /*-------------------------------------------------------------------------*/ | |
1108 | ||
1da177e4 LT |
1109 | // precondition: never called in_interrupt |
1110 | ||
38bde1d4 | 1111 | int |
1da177e4 LT |
1112 | usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) |
1113 | { | |
1114 | struct usbnet *dev; | |
cb1cebbe | 1115 | struct net_device *net; |
1da177e4 LT |
1116 | struct usb_host_interface *interface; |
1117 | struct driver_info *info; | |
1118 | struct usb_device *xdev; | |
1119 | int status; | |
296c0242 | 1120 | const char *name; |
1da177e4 | 1121 | |
296c0242 | 1122 | name = udev->dev.driver->name; |
1da177e4 LT |
1123 | info = (struct driver_info *) prod->driver_info; |
1124 | if (!info) { | |
296c0242 | 1125 | dev_dbg (&udev->dev, "blacklisted by %s\n", name); |
1da177e4 LT |
1126 | return -ENODEV; |
1127 | } | |
1128 | xdev = interface_to_usbdev (udev); | |
1129 | interface = udev->cur_altsetting; | |
1130 | ||
1131 | usb_get_dev (xdev); | |
1132 | ||
1133 | status = -ENOMEM; | |
1134 | ||
1135 | // set up our own records | |
1136 | net = alloc_etherdev(sizeof(*dev)); | |
1137 | if (!net) { | |
1138 | dbg ("can't kmalloc dev"); | |
1139 | goto out; | |
1140 | } | |
1141 | ||
1142 | dev = netdev_priv(net); | |
1143 | dev->udev = xdev; | |
1144 | dev->driver_info = info; | |
296c0242 | 1145 | dev->driver_name = name; |
1da177e4 LT |
1146 | dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV |
1147 | | NETIF_MSG_PROBE | NETIF_MSG_LINK); | |
1148 | skb_queue_head_init (&dev->rxq); | |
1149 | skb_queue_head_init (&dev->txq); | |
1150 | skb_queue_head_init (&dev->done); | |
1151 | dev->bh.func = usbnet_bh; | |
1152 | dev->bh.data = (unsigned long) dev; | |
c4028958 | 1153 | INIT_WORK (&dev->kevent, kevent); |
1da177e4 LT |
1154 | dev->delay.function = usbnet_bh; |
1155 | dev->delay.data = (unsigned long) dev; | |
1156 | init_timer (&dev->delay); | |
a9fc6338 | 1157 | mutex_init (&dev->phy_mutex); |
1da177e4 LT |
1158 | |
1159 | SET_MODULE_OWNER (net); | |
1160 | dev->net = net; | |
1161 | strcpy (net->name, "usb%d"); | |
1162 | memcpy (net->dev_addr, node_id, sizeof node_id); | |
1163 | ||
2e55cc72 DB |
1164 | /* rx and tx sides can use different message sizes; |
1165 | * bind() should set rx_urb_size in that case. | |
1166 | */ | |
1167 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
1da177e4 LT |
1168 | #if 0 |
1169 | // dma_supported() is deeply broken on almost all architectures | |
1170 | // possible with some EHCI controllers | |
1171 | if (dma_supported (&udev->dev, DMA_64BIT_MASK)) | |
1172 | net->features |= NETIF_F_HIGHDMA; | |
1173 | #endif | |
1174 | ||
1175 | net->change_mtu = usbnet_change_mtu; | |
1176 | net->get_stats = usbnet_get_stats; | |
1177 | net->hard_start_xmit = usbnet_start_xmit; | |
1178 | net->open = usbnet_open; | |
1179 | net->stop = usbnet_stop; | |
1180 | net->watchdog_timeo = TX_TIMEOUT_JIFFIES; | |
1181 | net->tx_timeout = usbnet_tx_timeout; | |
1da177e4 LT |
1182 | net->ethtool_ops = &usbnet_ethtool_ops; |
1183 | ||
1184 | // allow device-specific bind/init procedures | |
1185 | // NOTE net->name still not usable ... | |
1186 | if (info->bind) { | |
1187 | status = info->bind (dev, udev); | |
cb1cebbe DB |
1188 | if (status < 0) |
1189 | goto out1; | |
1190 | ||
1da177e4 LT |
1191 | // heuristic: "usb%d" for links we know are two-host, |
1192 | // else "eth%d" when there's reasonable doubt. userspace | |
1193 | // can rename the link if it knows better. | |
1194 | if ((dev->driver_info->flags & FLAG_ETHER) != 0 | |
1195 | && (net->dev_addr [0] & 0x02) == 0) | |
1196 | strcpy (net->name, "eth%d"); | |
f29fc259 DB |
1197 | |
1198 | /* maybe the remote can't receive an Ethernet MTU */ | |
1199 | if (net->mtu > (dev->hard_mtu - net->hard_header_len)) | |
1200 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
2e55cc72 DB |
1201 | } else if (!info->in || !info->out) |
1202 | status = usbnet_get_endpoints (dev, udev); | |
1da177e4 LT |
1203 | else { |
1204 | dev->in = usb_rcvbulkpipe (xdev, info->in); | |
1205 | dev->out = usb_sndbulkpipe (xdev, info->out); | |
1206 | if (!(info->flags & FLAG_NO_SETINT)) | |
1207 | status = usb_set_interface (xdev, | |
1208 | interface->desc.bInterfaceNumber, | |
1209 | interface->desc.bAlternateSetting); | |
1210 | else | |
1211 | status = 0; | |
1212 | ||
1213 | } | |
1da177e4 LT |
1214 | if (status == 0 && dev->status) |
1215 | status = init_status (dev, udev); | |
1216 | if (status < 0) | |
cb1cebbe | 1217 | goto out3; |
1da177e4 | 1218 | |
2e55cc72 DB |
1219 | if (!dev->rx_urb_size) |
1220 | dev->rx_urb_size = dev->hard_mtu; | |
1da177e4 | 1221 | dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); |
cb1cebbe | 1222 | |
1da177e4 LT |
1223 | SET_NETDEV_DEV(net, &udev->dev); |
1224 | status = register_netdev (net); | |
1225 | if (status) | |
1226 | goto out3; | |
1227 | if (netif_msg_probe (dev)) | |
38bde1d4 | 1228 | devinfo (dev, "register '%s' at usb-%s-%s, %s, " |
1da177e4 | 1229 | "%02x:%02x:%02x:%02x:%02x:%02x", |
38bde1d4 | 1230 | udev->dev.driver->name, |
1da177e4 LT |
1231 | xdev->bus->bus_name, xdev->devpath, |
1232 | dev->driver_info->description, | |
1233 | net->dev_addr [0], net->dev_addr [1], | |
1234 | net->dev_addr [2], net->dev_addr [3], | |
1235 | net->dev_addr [4], net->dev_addr [5]); | |
1236 | ||
1237 | // ok, it's ready to go. | |
1238 | usb_set_intfdata (udev, dev); | |
1239 | ||
1240 | // start as if the link is up | |
1241 | netif_device_attach (net); | |
1242 | ||
1243 | return 0; | |
1244 | ||
1245 | out3: | |
1246 | if (info->unbind) | |
1247 | info->unbind (dev, udev); | |
1248 | out1: | |
1249 | free_netdev(net); | |
1250 | out: | |
1251 | usb_put_dev(xdev); | |
1252 | return status; | |
1253 | } | |
38bde1d4 | 1254 | EXPORT_SYMBOL_GPL(usbnet_probe); |
1da177e4 LT |
1255 | |
1256 | /*-------------------------------------------------------------------------*/ | |
1257 | ||
36433127 ON |
1258 | /* |
1259 | * suspend the whole driver as soon as the first interface is suspended | |
1260 | * resume only when the last interface is resumed | |
38bde1d4 | 1261 | */ |
1da177e4 | 1262 | |
38bde1d4 | 1263 | int usbnet_suspend (struct usb_interface *intf, pm_message_t message) |
1da177e4 LT |
1264 | { |
1265 | struct usbnet *dev = usb_get_intfdata(intf); | |
cb1cebbe | 1266 | |
36433127 ON |
1267 | if (!dev->suspend_count++) { |
1268 | /* accelerate emptying of the rx and queues, to avoid | |
1269 | * having everything error out. | |
1270 | */ | |
1271 | netif_device_detach (dev->net); | |
1272 | (void) unlink_urbs (dev, &dev->rxq); | |
1273 | (void) unlink_urbs (dev, &dev->txq); | |
1274 | } | |
1da177e4 LT |
1275 | return 0; |
1276 | } | |
38bde1d4 | 1277 | EXPORT_SYMBOL_GPL(usbnet_suspend); |
1da177e4 | 1278 | |
38bde1d4 | 1279 | int usbnet_resume (struct usb_interface *intf) |
1da177e4 LT |
1280 | { |
1281 | struct usbnet *dev = usb_get_intfdata(intf); | |
1282 | ||
36433127 ON |
1283 | if (!--dev->suspend_count) { |
1284 | netif_device_attach (dev->net); | |
1285 | tasklet_schedule (&dev->bh); | |
1286 | } | |
1da177e4 LT |
1287 | return 0; |
1288 | } | |
38bde1d4 | 1289 | EXPORT_SYMBOL_GPL(usbnet_resume); |
1da177e4 | 1290 | |
1da177e4 | 1291 | |
1da177e4 LT |
1292 | /*-------------------------------------------------------------------------*/ |
1293 | ||
f29fc259 | 1294 | static int __init usbnet_init(void) |
1da177e4 | 1295 | { |
090ffa9d | 1296 | /* compiler should optimize this out */ |
f8ac232a | 1297 | BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) |
1da177e4 | 1298 | < sizeof (struct skb_data)); |
1da177e4 LT |
1299 | |
1300 | random_ether_addr(node_id); | |
cb1cebbe | 1301 | return 0; |
1da177e4 | 1302 | } |
f29fc259 | 1303 | module_init(usbnet_init); |
1da177e4 | 1304 | |
f29fc259 | 1305 | static void __exit usbnet_exit(void) |
1da177e4 | 1306 | { |
1da177e4 | 1307 | } |
f29fc259 | 1308 | module_exit(usbnet_exit); |
1da177e4 | 1309 | |
f29fc259 | 1310 | MODULE_AUTHOR("David Brownell"); |
090ffa9d | 1311 | MODULE_DESCRIPTION("USB network driver framework"); |
f29fc259 | 1312 | MODULE_LICENSE("GPL"); |