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 | } | |
18ab458f | 195 | return 0; |
1da177e4 LT |
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)) { | |
18ab458f | 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) { | |
18ab458f DB |
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 | ||
18ab458f DB |
407 | /* stalls need manual reset. this is rare ... except that |
408 | * when going through USB 2.0 TTs, unplug appears this way. | |
409 | * we avoid the highspeed version of the ETIMEOUT/EILSEQ | |
410 | * storm, recovering as needed. | |
411 | */ | |
412 | case -EPIPE: | |
1da177e4 | 413 | dev->stats.rx_errors++; |
2e55cc72 | 414 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
1da177e4 LT |
415 | // FALLTHROUGH |
416 | ||
18ab458f DB |
417 | /* software-driven interface shutdown */ |
418 | case -ECONNRESET: /* async unlink */ | |
419 | case -ESHUTDOWN: /* hardware gone */ | |
1da177e4 LT |
420 | if (netif_msg_ifdown (dev)) |
421 | devdbg (dev, "rx shutdown, code %d", urb_status); | |
422 | goto block; | |
423 | ||
18ab458f DB |
424 | /* we get controller i/o faults during khubd disconnect() delays. |
425 | * throttle down resubmits, to avoid log floods; just temporarily, | |
426 | * so we still recover when the fault isn't a khubd delay. | |
427 | */ | |
428 | case -EPROTO: | |
429 | case -ETIME: | |
430 | case -EILSEQ: | |
1da177e4 LT |
431 | dev->stats.rx_errors++; |
432 | if (!timer_pending (&dev->delay)) { | |
433 | mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); | |
434 | if (netif_msg_link (dev)) | |
435 | devdbg (dev, "rx throttle %d", urb_status); | |
436 | } | |
437 | block: | |
438 | entry->state = rx_cleanup; | |
439 | entry->urb = urb; | |
440 | urb = NULL; | |
441 | break; | |
442 | ||
18ab458f DB |
443 | /* data overrun ... flush fifo? */ |
444 | case -EOVERFLOW: | |
1da177e4 LT |
445 | dev->stats.rx_over_errors++; |
446 | // FALLTHROUGH | |
cb1cebbe | 447 | |
18ab458f | 448 | default: |
1da177e4 LT |
449 | entry->state = rx_cleanup; |
450 | dev->stats.rx_errors++; | |
451 | if (netif_msg_rx_err (dev)) | |
452 | devdbg (dev, "rx status %d", urb_status); | |
453 | break; | |
454 | } | |
455 | ||
8728b834 | 456 | defer_bh(dev, skb, &dev->rxq); |
1da177e4 LT |
457 | |
458 | if (urb) { | |
459 | if (netif_running (dev->net) | |
460 | && !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
461 | rx_submit (dev, urb, GFP_ATOMIC); | |
462 | return; | |
463 | } | |
464 | usb_free_urb (urb); | |
465 | } | |
466 | if (netif_msg_rx_err (dev)) | |
467 | devdbg (dev, "no read resubmitted"); | |
468 | } | |
469 | ||
7d12e780 | 470 | static void intr_complete (struct urb *urb) |
1da177e4 LT |
471 | { |
472 | struct usbnet *dev = urb->context; | |
473 | int status = urb->status; | |
474 | ||
475 | switch (status) { | |
18ab458f DB |
476 | /* success */ |
477 | case 0: | |
1da177e4 LT |
478 | dev->driver_info->status(dev, urb); |
479 | break; | |
480 | ||
18ab458f DB |
481 | /* software-driven interface shutdown */ |
482 | case -ENOENT: /* urb killed */ | |
483 | case -ESHUTDOWN: /* hardware gone */ | |
1da177e4 LT |
484 | if (netif_msg_ifdown (dev)) |
485 | devdbg (dev, "intr shutdown, code %d", status); | |
486 | return; | |
487 | ||
18ab458f DB |
488 | /* NOTE: not throttling like RX/TX, since this endpoint |
489 | * already polls infrequently | |
490 | */ | |
491 | default: | |
1da177e4 LT |
492 | devdbg (dev, "intr status %d", status); |
493 | break; | |
494 | } | |
495 | ||
496 | if (!netif_running (dev->net)) | |
497 | return; | |
498 | ||
499 | memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); | |
500 | status = usb_submit_urb (urb, GFP_ATOMIC); | |
501 | if (status != 0 && netif_msg_timer (dev)) | |
502 | deverr(dev, "intr resubmit --> %d", status); | |
503 | } | |
504 | ||
505 | /*-------------------------------------------------------------------------*/ | |
506 | ||
507 | // unlink pending rx/tx; completion handlers do all other cleanup | |
508 | ||
509 | static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) | |
510 | { | |
511 | unsigned long flags; | |
512 | struct sk_buff *skb, *skbnext; | |
513 | int count = 0; | |
514 | ||
515 | spin_lock_irqsave (&q->lock, flags); | |
516 | for (skb = q->next; skb != (struct sk_buff *) q; skb = skbnext) { | |
517 | struct skb_data *entry; | |
518 | struct urb *urb; | |
519 | int retval; | |
520 | ||
521 | entry = (struct skb_data *) skb->cb; | |
522 | urb = entry->urb; | |
523 | skbnext = skb->next; | |
524 | ||
525 | // during some PM-driven resume scenarios, | |
526 | // these (async) unlinks complete immediately | |
527 | retval = usb_unlink_urb (urb); | |
528 | if (retval != -EINPROGRESS && retval != 0) | |
529 | devdbg (dev, "unlink urb err, %d", retval); | |
530 | else | |
531 | count++; | |
532 | } | |
533 | spin_unlock_irqrestore (&q->lock, flags); | |
534 | return count; | |
535 | } | |
536 | ||
a99c1949 JP |
537 | // Flush all pending rx urbs |
538 | // minidrivers may need to do this when the MTU changes | |
539 | ||
540 | void usbnet_unlink_rx_urbs(struct usbnet *dev) | |
541 | { | |
542 | if (netif_running(dev->net)) { | |
543 | (void) unlink_urbs (dev, &dev->rxq); | |
544 | tasklet_schedule(&dev->bh); | |
545 | } | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); | |
1da177e4 LT |
548 | |
549 | /*-------------------------------------------------------------------------*/ | |
550 | ||
551 | // precondition: never called in_interrupt | |
552 | ||
553 | static int usbnet_stop (struct net_device *net) | |
554 | { | |
555 | struct usbnet *dev = netdev_priv(net); | |
556 | int temp; | |
7259f0d0 | 557 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup); |
1da177e4 LT |
558 | DECLARE_WAITQUEUE (wait, current); |
559 | ||
560 | netif_stop_queue (net); | |
561 | ||
562 | if (netif_msg_ifdown (dev)) | |
563 | devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld", | |
cb1cebbe | 564 | dev->stats.rx_packets, dev->stats.tx_packets, |
1da177e4 LT |
565 | dev->stats.rx_errors, dev->stats.tx_errors |
566 | ); | |
567 | ||
568 | // ensure there are no more active urbs | |
569 | add_wait_queue (&unlink_wakeup, &wait); | |
570 | dev->wait = &unlink_wakeup; | |
571 | temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq); | |
572 | ||
573 | // maybe wait for deletions to finish. | |
18ab458f DB |
574 | while (!skb_queue_empty(&dev->rxq) |
575 | && !skb_queue_empty(&dev->txq) | |
576 | && !skb_queue_empty(&dev->done)) { | |
1da177e4 LT |
577 | msleep(UNLINK_TIMEOUT_MS); |
578 | if (netif_msg_ifdown (dev)) | |
579 | devdbg (dev, "waited for %d urb completions", temp); | |
580 | } | |
581 | dev->wait = NULL; | |
cb1cebbe | 582 | remove_wait_queue (&unlink_wakeup, &wait); |
1da177e4 LT |
583 | |
584 | usb_kill_urb(dev->interrupt); | |
585 | ||
586 | /* deferred work (task, timer, softirq) must also stop. | |
587 | * can't flush_scheduled_work() until we drop rtnl (later), | |
588 | * else workers could deadlock; so make workers a NOP. | |
589 | */ | |
590 | dev->flags = 0; | |
591 | del_timer_sync (&dev->delay); | |
592 | tasklet_kill (&dev->bh); | |
a11a6544 | 593 | usb_autopm_put_interface(dev->intf); |
1da177e4 LT |
594 | |
595 | return 0; | |
596 | } | |
597 | ||
598 | /*-------------------------------------------------------------------------*/ | |
599 | ||
600 | // posts reads, and enables write queuing | |
601 | ||
602 | // precondition: never called in_interrupt | |
603 | ||
604 | static int usbnet_open (struct net_device *net) | |
605 | { | |
606 | struct usbnet *dev = netdev_priv(net); | |
a11a6544 | 607 | int retval; |
1da177e4 LT |
608 | struct driver_info *info = dev->driver_info; |
609 | ||
a11a6544 ON |
610 | if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { |
611 | if (netif_msg_ifup (dev)) | |
612 | devinfo (dev, | |
613 | "resumption fail (%d) usbnet usb-%s-%s, %s", | |
614 | retval, | |
615 | dev->udev->bus->bus_name, dev->udev->devpath, | |
616 | info->description); | |
617 | goto done_nopm; | |
618 | } | |
619 | ||
1da177e4 LT |
620 | // put into "known safe" state |
621 | if (info->reset && (retval = info->reset (dev)) < 0) { | |
622 | if (netif_msg_ifup (dev)) | |
623 | devinfo (dev, | |
624 | "open reset fail (%d) usbnet usb-%s-%s, %s", | |
625 | retval, | |
626 | dev->udev->bus->bus_name, dev->udev->devpath, | |
627 | info->description); | |
628 | goto done; | |
629 | } | |
630 | ||
631 | // insist peer be connected | |
632 | if (info->check_connect && (retval = info->check_connect (dev)) < 0) { | |
633 | if (netif_msg_ifup (dev)) | |
634 | devdbg (dev, "can't open; %d", retval); | |
635 | goto done; | |
636 | } | |
637 | ||
638 | /* start any status interrupt transfer */ | |
639 | if (dev->interrupt) { | |
640 | retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); | |
641 | if (retval < 0) { | |
642 | if (netif_msg_ifup (dev)) | |
643 | deverr (dev, "intr submit %d", retval); | |
644 | goto done; | |
645 | } | |
646 | } | |
647 | ||
648 | netif_start_queue (net); | |
649 | if (netif_msg_ifup (dev)) { | |
650 | char *framing; | |
651 | ||
652 | if (dev->driver_info->flags & FLAG_FRAMING_NC) | |
653 | framing = "NetChip"; | |
654 | else if (dev->driver_info->flags & FLAG_FRAMING_GL) | |
655 | framing = "GeneSys"; | |
656 | else if (dev->driver_info->flags & FLAG_FRAMING_Z) | |
657 | framing = "Zaurus"; | |
658 | else if (dev->driver_info->flags & FLAG_FRAMING_RN) | |
659 | framing = "RNDIS"; | |
660 | else if (dev->driver_info->flags & FLAG_FRAMING_AX) | |
661 | framing = "ASIX"; | |
662 | else | |
663 | framing = "simple"; | |
664 | ||
665 | devinfo (dev, "open: enable queueing " | |
666 | "(rx %d, tx %d) mtu %d %s framing", | |
25d94e68 | 667 | (int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu, |
1da177e4 LT |
668 | framing); |
669 | } | |
670 | ||
671 | // delay posting reads until we're fully open | |
672 | tasklet_schedule (&dev->bh); | |
a11a6544 | 673 | return retval; |
1da177e4 | 674 | done: |
a11a6544 ON |
675 | usb_autopm_put_interface(dev->intf); |
676 | done_nopm: | |
1da177e4 LT |
677 | return retval; |
678 | } | |
679 | ||
680 | /*-------------------------------------------------------------------------*/ | |
681 | ||
2e55cc72 DB |
682 | /* ethtool methods; minidrivers may need to add some more, but |
683 | * they'll probably want to use this base set. | |
684 | */ | |
685 | ||
c41286fd AB |
686 | int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) |
687 | { | |
688 | struct usbnet *dev = netdev_priv(net); | |
689 | ||
690 | if (!dev->mii.mdio_read) | |
691 | return -EOPNOTSUPP; | |
692 | ||
693 | return mii_ethtool_gset(&dev->mii, cmd); | |
694 | } | |
695 | EXPORT_SYMBOL_GPL(usbnet_get_settings); | |
696 | ||
697 | int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) | |
698 | { | |
699 | struct usbnet *dev = netdev_priv(net); | |
700 | int retval; | |
701 | ||
702 | if (!dev->mii.mdio_write) | |
703 | return -EOPNOTSUPP; | |
704 | ||
705 | retval = mii_ethtool_sset(&dev->mii, cmd); | |
706 | ||
707 | /* link speed/duplex might have changed */ | |
708 | if (dev->driver_info->link_reset) | |
709 | dev->driver_info->link_reset(dev); | |
710 | ||
711 | return retval; | |
712 | ||
713 | } | |
714 | EXPORT_SYMBOL_GPL(usbnet_set_settings); | |
715 | ||
c41286fd | 716 | u32 usbnet_get_link (struct net_device *net) |
1da177e4 LT |
717 | { |
718 | struct usbnet *dev = netdev_priv(net); | |
719 | ||
f29fc259 | 720 | /* If a check_connect is defined, return its result */ |
1da177e4 LT |
721 | if (dev->driver_info->check_connect) |
722 | return dev->driver_info->check_connect (dev) == 0; | |
723 | ||
c41286fd AB |
724 | /* if the device has mii operations, use those */ |
725 | if (dev->mii.mdio_read) | |
726 | return mii_link_ok(&dev->mii); | |
727 | ||
f29fc259 | 728 | /* Otherwise, say we're up (to avoid breaking scripts) */ |
1da177e4 LT |
729 | return 1; |
730 | } | |
c41286fd | 731 | EXPORT_SYMBOL_GPL(usbnet_get_link); |
1da177e4 | 732 | |
18ee91fa | 733 | int usbnet_nway_reset(struct net_device *net) |
1da177e4 LT |
734 | { |
735 | struct usbnet *dev = netdev_priv(net); | |
736 | ||
18ee91fa DB |
737 | if (!dev->mii.mdio_write) |
738 | return -EOPNOTSUPP; | |
739 | ||
740 | return mii_nway_restart(&dev->mii); | |
1da177e4 | 741 | } |
18ee91fa | 742 | EXPORT_SYMBOL_GPL(usbnet_nway_reset); |
1da177e4 | 743 | |
18ee91fa | 744 | void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) |
1da177e4 LT |
745 | { |
746 | struct usbnet *dev = netdev_priv(net); | |
747 | ||
296c0242 | 748 | strncpy (info->driver, dev->driver_name, sizeof info->driver); |
18ee91fa DB |
749 | strncpy (info->version, DRIVER_VERSION, sizeof info->version); |
750 | strncpy (info->fw_version, dev->driver_info->description, | |
751 | sizeof info->fw_version); | |
752 | usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); | |
1da177e4 | 753 | } |
18ee91fa | 754 | EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); |
1da177e4 | 755 | |
18ee91fa | 756 | u32 usbnet_get_msglevel (struct net_device *net) |
c41286fd AB |
757 | { |
758 | struct usbnet *dev = netdev_priv(net); | |
759 | ||
18ee91fa DB |
760 | return dev->msg_enable; |
761 | } | |
762 | EXPORT_SYMBOL_GPL(usbnet_get_msglevel); | |
c41286fd | 763 | |
18ee91fa DB |
764 | void usbnet_set_msglevel (struct net_device *net, u32 level) |
765 | { | |
766 | struct usbnet *dev = netdev_priv(net); | |
767 | ||
768 | dev->msg_enable = level; | |
c41286fd | 769 | } |
18ee91fa | 770 | EXPORT_SYMBOL_GPL(usbnet_set_msglevel); |
c41286fd | 771 | |
2e55cc72 DB |
772 | /* drivers may override default ethtool_ops in their bind() routine */ |
773 | static struct ethtool_ops usbnet_ethtool_ops = { | |
c41286fd AB |
774 | .get_settings = usbnet_get_settings, |
775 | .set_settings = usbnet_set_settings, | |
2e55cc72 | 776 | .get_link = usbnet_get_link, |
c41286fd | 777 | .nway_reset = usbnet_nway_reset, |
18ee91fa | 778 | .get_drvinfo = usbnet_get_drvinfo, |
2e55cc72 DB |
779 | .get_msglevel = usbnet_get_msglevel, |
780 | .set_msglevel = usbnet_set_msglevel, | |
781 | }; | |
1da177e4 LT |
782 | |
783 | /*-------------------------------------------------------------------------*/ | |
784 | ||
785 | /* work that cannot be done in interrupt context uses keventd. | |
786 | * | |
787 | * NOTE: with 2.5 we could do more of this using completion callbacks, | |
788 | * especially now that control transfers can be queued. | |
789 | */ | |
790 | static void | |
c4028958 | 791 | kevent (struct work_struct *work) |
1da177e4 | 792 | { |
c4028958 DH |
793 | struct usbnet *dev = |
794 | container_of(work, struct usbnet, kevent); | |
1da177e4 LT |
795 | int status; |
796 | ||
797 | /* usb_clear_halt() needs a thread context */ | |
798 | if (test_bit (EVENT_TX_HALT, &dev->flags)) { | |
799 | unlink_urbs (dev, &dev->txq); | |
800 | status = usb_clear_halt (dev->udev, dev->out); | |
f29fc259 DB |
801 | if (status < 0 |
802 | && status != -EPIPE | |
803 | && status != -ESHUTDOWN) { | |
1da177e4 LT |
804 | if (netif_msg_tx_err (dev)) |
805 | deverr (dev, "can't clear tx halt, status %d", | |
806 | status); | |
807 | } else { | |
808 | clear_bit (EVENT_TX_HALT, &dev->flags); | |
f29fc259 DB |
809 | if (status != -ESHUTDOWN) |
810 | netif_wake_queue (dev->net); | |
1da177e4 LT |
811 | } |
812 | } | |
813 | if (test_bit (EVENT_RX_HALT, &dev->flags)) { | |
814 | unlink_urbs (dev, &dev->rxq); | |
815 | status = usb_clear_halt (dev->udev, dev->in); | |
f29fc259 DB |
816 | if (status < 0 |
817 | && status != -EPIPE | |
818 | && status != -ESHUTDOWN) { | |
1da177e4 LT |
819 | if (netif_msg_rx_err (dev)) |
820 | deverr (dev, "can't clear rx halt, status %d", | |
821 | status); | |
822 | } else { | |
823 | clear_bit (EVENT_RX_HALT, &dev->flags); | |
824 | tasklet_schedule (&dev->bh); | |
825 | } | |
826 | } | |
827 | ||
828 | /* tasklet could resubmit itself forever if memory is tight */ | |
829 | if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { | |
830 | struct urb *urb = NULL; | |
831 | ||
832 | if (netif_running (dev->net)) | |
833 | urb = usb_alloc_urb (0, GFP_KERNEL); | |
834 | else | |
835 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
836 | if (urb != NULL) { | |
837 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
838 | rx_submit (dev, urb, GFP_KERNEL); | |
839 | tasklet_schedule (&dev->bh); | |
840 | } | |
841 | } | |
842 | ||
7ea13c9c | 843 | if (test_bit (EVENT_LINK_RESET, &dev->flags)) { |
cb1cebbe | 844 | struct driver_info *info = dev->driver_info; |
7ea13c9c DH |
845 | int retval = 0; |
846 | ||
847 | clear_bit (EVENT_LINK_RESET, &dev->flags); | |
848 | if(info->link_reset && (retval = info->link_reset(dev)) < 0) { | |
849 | devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s", | |
850 | retval, | |
851 | dev->udev->bus->bus_name, dev->udev->devpath, | |
852 | info->description); | |
853 | } | |
854 | } | |
855 | ||
1da177e4 LT |
856 | if (dev->flags) |
857 | devdbg (dev, "kevent done, flags = 0x%lx", | |
858 | dev->flags); | |
859 | } | |
860 | ||
861 | /*-------------------------------------------------------------------------*/ | |
862 | ||
7d12e780 | 863 | static void tx_complete (struct urb *urb) |
1da177e4 LT |
864 | { |
865 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
866 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
867 | struct usbnet *dev = entry->dev; | |
868 | ||
869 | if (urb->status == 0) { | |
870 | dev->stats.tx_packets++; | |
871 | dev->stats.tx_bytes += entry->length; | |
872 | } else { | |
873 | dev->stats.tx_errors++; | |
874 | ||
875 | switch (urb->status) { | |
876 | case -EPIPE: | |
2e55cc72 | 877 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
1da177e4 LT |
878 | break; |
879 | ||
880 | /* software-driven interface shutdown */ | |
881 | case -ECONNRESET: // async unlink | |
882 | case -ESHUTDOWN: // hardware gone | |
883 | break; | |
884 | ||
885 | // like rx, tx gets controller i/o faults during khubd delays | |
886 | // and so it uses the same throttling mechanism. | |
38e2bfc9 PZ |
887 | case -EPROTO: |
888 | case -ETIME: | |
889 | case -EILSEQ: | |
1da177e4 LT |
890 | if (!timer_pending (&dev->delay)) { |
891 | mod_timer (&dev->delay, | |
892 | jiffies + THROTTLE_JIFFIES); | |
893 | if (netif_msg_link (dev)) | |
894 | devdbg (dev, "tx throttle %d", | |
895 | urb->status); | |
896 | } | |
897 | netif_stop_queue (dev->net); | |
898 | break; | |
899 | default: | |
900 | if (netif_msg_tx_err (dev)) | |
901 | devdbg (dev, "tx err %d", entry->urb->status); | |
902 | break; | |
903 | } | |
904 | } | |
905 | ||
906 | urb->dev = NULL; | |
907 | entry->state = tx_done; | |
8728b834 | 908 | defer_bh(dev, skb, &dev->txq); |
1da177e4 LT |
909 | } |
910 | ||
911 | /*-------------------------------------------------------------------------*/ | |
912 | ||
913 | static void usbnet_tx_timeout (struct net_device *net) | |
914 | { | |
915 | struct usbnet *dev = netdev_priv(net); | |
916 | ||
917 | unlink_urbs (dev, &dev->txq); | |
918 | tasklet_schedule (&dev->bh); | |
919 | ||
920 | // FIXME: device recovery -- reset? | |
921 | } | |
922 | ||
923 | /*-------------------------------------------------------------------------*/ | |
924 | ||
925 | static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net) | |
926 | { | |
927 | struct usbnet *dev = netdev_priv(net); | |
928 | int length; | |
929 | int retval = NET_XMIT_SUCCESS; | |
930 | struct urb *urb = NULL; | |
931 | struct skb_data *entry; | |
932 | struct driver_info *info = dev->driver_info; | |
933 | unsigned long flags; | |
1da177e4 LT |
934 | |
935 | // some devices want funky USB-level framing, for | |
936 | // win32 driver (usually) and/or hardware quirks | |
937 | if (info->tx_fixup) { | |
938 | skb = info->tx_fixup (dev, skb, GFP_ATOMIC); | |
939 | if (!skb) { | |
940 | if (netif_msg_tx_err (dev)) | |
941 | devdbg (dev, "can't tx_fixup skb"); | |
942 | goto drop; | |
943 | } | |
944 | } | |
945 | length = skb->len; | |
946 | ||
947 | if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { | |
948 | if (netif_msg_tx_err (dev)) | |
949 | devdbg (dev, "no urb"); | |
950 | goto drop; | |
951 | } | |
952 | ||
953 | entry = (struct skb_data *) skb->cb; | |
954 | entry->urb = urb; | |
955 | entry->dev = dev; | |
956 | entry->state = tx_start; | |
957 | entry->length = length; | |
958 | ||
1da177e4 LT |
959 | usb_fill_bulk_urb (urb, dev->udev, dev->out, |
960 | skb->data, skb->len, tx_complete, skb); | |
1da177e4 LT |
961 | |
962 | /* don't assume the hardware handles USB_ZERO_PACKET | |
963 | * NOTE: strictly conforming cdc-ether devices should expect | |
964 | * the ZLP here, but ignore the one-byte packet. | |
1da177e4 | 965 | */ |
3e323f3e | 966 | if ((length % dev->maxpacket) == 0) { |
1da177e4 | 967 | urb->transfer_buffer_length++; |
3e323f3e PK |
968 | if (skb_tailroom(skb)) { |
969 | skb->data[skb->len] = 0; | |
970 | __skb_put(skb, 1); | |
971 | } | |
972 | } | |
1da177e4 LT |
973 | |
974 | spin_lock_irqsave (&dev->txq.lock, flags); | |
975 | ||
1da177e4 LT |
976 | switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { |
977 | case -EPIPE: | |
978 | netif_stop_queue (net); | |
2e55cc72 | 979 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
1da177e4 LT |
980 | break; |
981 | default: | |
982 | if (netif_msg_tx_err (dev)) | |
983 | devdbg (dev, "tx: submit urb err %d", retval); | |
984 | break; | |
985 | case 0: | |
986 | net->trans_start = jiffies; | |
987 | __skb_queue_tail (&dev->txq, skb); | |
988 | if (dev->txq.qlen >= TX_QLEN (dev)) | |
989 | netif_stop_queue (net); | |
990 | } | |
991 | spin_unlock_irqrestore (&dev->txq.lock, flags); | |
992 | ||
993 | if (retval) { | |
994 | if (netif_msg_tx_err (dev)) | |
995 | devdbg (dev, "drop, code %d", retval); | |
996 | drop: | |
997 | retval = NET_XMIT_SUCCESS; | |
998 | dev->stats.tx_dropped++; | |
999 | if (skb) | |
1000 | dev_kfree_skb_any (skb); | |
1001 | usb_free_urb (urb); | |
1002 | } else if (netif_msg_tx_queued (dev)) { | |
1003 | devdbg (dev, "> tx, len %d, type 0x%x", | |
1004 | length, skb->protocol); | |
1005 | } | |
1006 | return retval; | |
1007 | } | |
1008 | ||
1009 | ||
1010 | /*-------------------------------------------------------------------------*/ | |
1011 | ||
1012 | // tasklet (work deferred from completions, in_irq) or timer | |
1013 | ||
1014 | static void usbnet_bh (unsigned long param) | |
1015 | { | |
1016 | struct usbnet *dev = (struct usbnet *) param; | |
1017 | struct sk_buff *skb; | |
1018 | struct skb_data *entry; | |
1019 | ||
1020 | while ((skb = skb_dequeue (&dev->done))) { | |
1021 | entry = (struct skb_data *) skb->cb; | |
1022 | switch (entry->state) { | |
18ab458f | 1023 | case rx_done: |
1da177e4 LT |
1024 | entry->state = rx_cleanup; |
1025 | rx_process (dev, skb); | |
1026 | continue; | |
18ab458f DB |
1027 | case tx_done: |
1028 | case rx_cleanup: | |
1da177e4 LT |
1029 | usb_free_urb (entry->urb); |
1030 | dev_kfree_skb (skb); | |
1031 | continue; | |
18ab458f | 1032 | default: |
1da177e4 LT |
1033 | devdbg (dev, "bogus skb state %d", entry->state); |
1034 | } | |
1035 | } | |
1036 | ||
1037 | // waiting for all pending urbs to complete? | |
1038 | if (dev->wait) { | |
1039 | if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { | |
1040 | wake_up (dev->wait); | |
1041 | } | |
1042 | ||
1043 | // or are we maybe short a few urbs? | |
1044 | } else if (netif_running (dev->net) | |
1045 | && netif_device_present (dev->net) | |
1046 | && !timer_pending (&dev->delay) | |
1047 | && !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
1048 | int temp = dev->rxq.qlen; | |
1049 | int qlen = RX_QLEN (dev); | |
1050 | ||
1051 | if (temp < qlen) { | |
1052 | struct urb *urb; | |
1053 | int i; | |
1054 | ||
1055 | // don't refill the queue all at once | |
1056 | for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { | |
1057 | urb = usb_alloc_urb (0, GFP_ATOMIC); | |
1058 | if (urb != NULL) | |
1059 | rx_submit (dev, urb, GFP_ATOMIC); | |
1060 | } | |
1061 | if (temp != dev->rxq.qlen && netif_msg_link (dev)) | |
1062 | devdbg (dev, "rxqlen %d --> %d", | |
1063 | temp, dev->rxq.qlen); | |
1064 | if (dev->rxq.qlen < qlen) | |
1065 | tasklet_schedule (&dev->bh); | |
1066 | } | |
1067 | if (dev->txq.qlen < TX_QLEN (dev)) | |
1068 | netif_wake_queue (dev->net); | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | ||
1073 | \f | |
1074 | /*------------------------------------------------------------------------- | |
1075 | * | |
1076 | * USB Device Driver support | |
1077 | * | |
1078 | *-------------------------------------------------------------------------*/ | |
cb1cebbe | 1079 | |
1da177e4 LT |
1080 | // precondition: never called in_interrupt |
1081 | ||
38bde1d4 | 1082 | void usbnet_disconnect (struct usb_interface *intf) |
1da177e4 LT |
1083 | { |
1084 | struct usbnet *dev; | |
1085 | struct usb_device *xdev; | |
1086 | struct net_device *net; | |
1087 | ||
1088 | dev = usb_get_intfdata(intf); | |
1089 | usb_set_intfdata(intf, NULL); | |
1090 | if (!dev) | |
1091 | return; | |
1092 | ||
1093 | xdev = interface_to_usbdev (intf); | |
1094 | ||
1095 | if (netif_msg_probe (dev)) | |
38bde1d4 DB |
1096 | devinfo (dev, "unregister '%s' usb-%s-%s, %s", |
1097 | intf->dev.driver->name, | |
1da177e4 LT |
1098 | xdev->bus->bus_name, xdev->devpath, |
1099 | dev->driver_info->description); | |
cb1cebbe | 1100 | |
1da177e4 LT |
1101 | net = dev->net; |
1102 | unregister_netdev (net); | |
1103 | ||
1104 | /* we don't hold rtnl here ... */ | |
1105 | flush_scheduled_work (); | |
1106 | ||
1107 | if (dev->driver_info->unbind) | |
1108 | dev->driver_info->unbind (dev, intf); | |
1109 | ||
1110 | free_netdev(net); | |
1111 | usb_put_dev (xdev); | |
1112 | } | |
38bde1d4 | 1113 | EXPORT_SYMBOL_GPL(usbnet_disconnect); |
1da177e4 LT |
1114 | |
1115 | ||
1116 | /*-------------------------------------------------------------------------*/ | |
1117 | ||
1da177e4 LT |
1118 | // precondition: never called in_interrupt |
1119 | ||
38bde1d4 | 1120 | int |
1da177e4 LT |
1121 | usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) |
1122 | { | |
1123 | struct usbnet *dev; | |
cb1cebbe | 1124 | struct net_device *net; |
1da177e4 LT |
1125 | struct usb_host_interface *interface; |
1126 | struct driver_info *info; | |
1127 | struct usb_device *xdev; | |
1128 | int status; | |
296c0242 | 1129 | const char *name; |
0795af57 | 1130 | DECLARE_MAC_BUF(mac); |
1da177e4 | 1131 | |
296c0242 | 1132 | name = udev->dev.driver->name; |
1da177e4 LT |
1133 | info = (struct driver_info *) prod->driver_info; |
1134 | if (!info) { | |
296c0242 | 1135 | dev_dbg (&udev->dev, "blacklisted by %s\n", name); |
1da177e4 LT |
1136 | return -ENODEV; |
1137 | } | |
1138 | xdev = interface_to_usbdev (udev); | |
1139 | interface = udev->cur_altsetting; | |
1140 | ||
1141 | usb_get_dev (xdev); | |
1142 | ||
1143 | status = -ENOMEM; | |
1144 | ||
1145 | // set up our own records | |
1146 | net = alloc_etherdev(sizeof(*dev)); | |
1147 | if (!net) { | |
1148 | dbg ("can't kmalloc dev"); | |
1149 | goto out; | |
1150 | } | |
1151 | ||
1152 | dev = netdev_priv(net); | |
1153 | dev->udev = xdev; | |
a11a6544 | 1154 | dev->intf = udev; |
1da177e4 | 1155 | dev->driver_info = info; |
296c0242 | 1156 | dev->driver_name = name; |
1da177e4 LT |
1157 | dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV |
1158 | | NETIF_MSG_PROBE | NETIF_MSG_LINK); | |
1159 | skb_queue_head_init (&dev->rxq); | |
1160 | skb_queue_head_init (&dev->txq); | |
1161 | skb_queue_head_init (&dev->done); | |
1162 | dev->bh.func = usbnet_bh; | |
1163 | dev->bh.data = (unsigned long) dev; | |
c4028958 | 1164 | INIT_WORK (&dev->kevent, kevent); |
1da177e4 LT |
1165 | dev->delay.function = usbnet_bh; |
1166 | dev->delay.data = (unsigned long) dev; | |
1167 | init_timer (&dev->delay); | |
a9fc6338 | 1168 | mutex_init (&dev->phy_mutex); |
1da177e4 | 1169 | |
1da177e4 LT |
1170 | dev->net = net; |
1171 | strcpy (net->name, "usb%d"); | |
1172 | memcpy (net->dev_addr, node_id, sizeof node_id); | |
1173 | ||
2e55cc72 DB |
1174 | /* rx and tx sides can use different message sizes; |
1175 | * bind() should set rx_urb_size in that case. | |
1176 | */ | |
1177 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
1da177e4 LT |
1178 | #if 0 |
1179 | // dma_supported() is deeply broken on almost all architectures | |
1180 | // possible with some EHCI controllers | |
1181 | if (dma_supported (&udev->dev, DMA_64BIT_MASK)) | |
1182 | net->features |= NETIF_F_HIGHDMA; | |
1183 | #endif | |
1184 | ||
1185 | net->change_mtu = usbnet_change_mtu; | |
1186 | net->get_stats = usbnet_get_stats; | |
1187 | net->hard_start_xmit = usbnet_start_xmit; | |
1188 | net->open = usbnet_open; | |
1189 | net->stop = usbnet_stop; | |
1190 | net->watchdog_timeo = TX_TIMEOUT_JIFFIES; | |
1191 | net->tx_timeout = usbnet_tx_timeout; | |
1da177e4 LT |
1192 | net->ethtool_ops = &usbnet_ethtool_ops; |
1193 | ||
1194 | // allow device-specific bind/init procedures | |
1195 | // NOTE net->name still not usable ... | |
1196 | if (info->bind) { | |
1197 | status = info->bind (dev, udev); | |
cb1cebbe DB |
1198 | if (status < 0) |
1199 | goto out1; | |
1200 | ||
1da177e4 LT |
1201 | // heuristic: "usb%d" for links we know are two-host, |
1202 | // else "eth%d" when there's reasonable doubt. userspace | |
1203 | // can rename the link if it knows better. | |
1204 | if ((dev->driver_info->flags & FLAG_ETHER) != 0 | |
1205 | && (net->dev_addr [0] & 0x02) == 0) | |
1206 | strcpy (net->name, "eth%d"); | |
6e3bbcc5 JK |
1207 | /* WLAN devices should always be named "wlan%d" */ |
1208 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) | |
1209 | strcpy(net->name, "wlan%d"); | |
f29fc259 DB |
1210 | |
1211 | /* maybe the remote can't receive an Ethernet MTU */ | |
1212 | if (net->mtu > (dev->hard_mtu - net->hard_header_len)) | |
1213 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
2e55cc72 DB |
1214 | } else if (!info->in || !info->out) |
1215 | status = usbnet_get_endpoints (dev, udev); | |
1da177e4 LT |
1216 | else { |
1217 | dev->in = usb_rcvbulkpipe (xdev, info->in); | |
1218 | dev->out = usb_sndbulkpipe (xdev, info->out); | |
1219 | if (!(info->flags & FLAG_NO_SETINT)) | |
1220 | status = usb_set_interface (xdev, | |
1221 | interface->desc.bInterfaceNumber, | |
1222 | interface->desc.bAlternateSetting); | |
1223 | else | |
1224 | status = 0; | |
1225 | ||
1226 | } | |
9514bfe5 | 1227 | if (status >= 0 && dev->status) |
1da177e4 LT |
1228 | status = init_status (dev, udev); |
1229 | if (status < 0) | |
cb1cebbe | 1230 | goto out3; |
1da177e4 | 1231 | |
2e55cc72 DB |
1232 | if (!dev->rx_urb_size) |
1233 | dev->rx_urb_size = dev->hard_mtu; | |
1da177e4 | 1234 | dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); |
cb1cebbe | 1235 | |
1da177e4 LT |
1236 | SET_NETDEV_DEV(net, &udev->dev); |
1237 | status = register_netdev (net); | |
1238 | if (status) | |
1239 | goto out3; | |
1240 | if (netif_msg_probe (dev)) | |
0795af57 | 1241 | devinfo (dev, "register '%s' at usb-%s-%s, %s, %s", |
38bde1d4 | 1242 | udev->dev.driver->name, |
1da177e4 LT |
1243 | xdev->bus->bus_name, xdev->devpath, |
1244 | dev->driver_info->description, | |
0795af57 | 1245 | print_mac(mac, net->dev_addr)); |
1da177e4 LT |
1246 | |
1247 | // ok, it's ready to go. | |
1248 | usb_set_intfdata (udev, dev); | |
1249 | ||
1250 | // start as if the link is up | |
1251 | netif_device_attach (net); | |
1252 | ||
1253 | return 0; | |
1254 | ||
1255 | out3: | |
1256 | if (info->unbind) | |
1257 | info->unbind (dev, udev); | |
1258 | out1: | |
1259 | free_netdev(net); | |
1260 | out: | |
1261 | usb_put_dev(xdev); | |
1262 | return status; | |
1263 | } | |
38bde1d4 | 1264 | EXPORT_SYMBOL_GPL(usbnet_probe); |
1da177e4 LT |
1265 | |
1266 | /*-------------------------------------------------------------------------*/ | |
1267 | ||
36433127 ON |
1268 | /* |
1269 | * suspend the whole driver as soon as the first interface is suspended | |
1270 | * resume only when the last interface is resumed | |
38bde1d4 | 1271 | */ |
1da177e4 | 1272 | |
38bde1d4 | 1273 | int usbnet_suspend (struct usb_interface *intf, pm_message_t message) |
1da177e4 LT |
1274 | { |
1275 | struct usbnet *dev = usb_get_intfdata(intf); | |
cb1cebbe | 1276 | |
36433127 | 1277 | if (!dev->suspend_count++) { |
a11a6544 ON |
1278 | /* |
1279 | * accelerate emptying of the rx and queues, to avoid | |
36433127 ON |
1280 | * having everything error out. |
1281 | */ | |
1282 | netif_device_detach (dev->net); | |
1283 | (void) unlink_urbs (dev, &dev->rxq); | |
1284 | (void) unlink_urbs (dev, &dev->txq); | |
a11a6544 ON |
1285 | /* |
1286 | * reattach so runtime management can use and | |
1287 | * wake the device | |
1288 | */ | |
1289 | netif_device_attach (dev->net); | |
36433127 | 1290 | } |
1da177e4 LT |
1291 | return 0; |
1292 | } | |
38bde1d4 | 1293 | EXPORT_SYMBOL_GPL(usbnet_suspend); |
1da177e4 | 1294 | |
38bde1d4 | 1295 | int usbnet_resume (struct usb_interface *intf) |
1da177e4 LT |
1296 | { |
1297 | struct usbnet *dev = usb_get_intfdata(intf); | |
1298 | ||
a11a6544 | 1299 | if (!--dev->suspend_count) |
36433127 | 1300 | tasklet_schedule (&dev->bh); |
a11a6544 | 1301 | |
1da177e4 LT |
1302 | return 0; |
1303 | } | |
38bde1d4 | 1304 | EXPORT_SYMBOL_GPL(usbnet_resume); |
1da177e4 | 1305 | |
1da177e4 | 1306 | |
1da177e4 LT |
1307 | /*-------------------------------------------------------------------------*/ |
1308 | ||
f29fc259 | 1309 | static int __init usbnet_init(void) |
1da177e4 | 1310 | { |
090ffa9d | 1311 | /* compiler should optimize this out */ |
f8ac232a | 1312 | BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) |
1da177e4 | 1313 | < sizeof (struct skb_data)); |
1da177e4 LT |
1314 | |
1315 | random_ether_addr(node_id); | |
cb1cebbe | 1316 | return 0; |
1da177e4 | 1317 | } |
f29fc259 | 1318 | module_init(usbnet_init); |
1da177e4 | 1319 | |
f29fc259 | 1320 | static void __exit usbnet_exit(void) |
1da177e4 | 1321 | { |
1da177e4 | 1322 | } |
f29fc259 | 1323 | module_exit(usbnet_exit); |
1da177e4 | 1324 | |
f29fc259 | 1325 | MODULE_AUTHOR("David Brownell"); |
090ffa9d | 1326 | MODULE_DESCRIPTION("USB network driver framework"); |
f29fc259 | 1327 | MODULE_LICENSE("GPL"); |