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> |
3692e94f | 44 | #include <linux/usb/usbnet.h> |
f29fc259 DB |
45 | |
46 | #define DRIVER_VERSION "22-Aug-2005" | |
1da177e4 LT |
47 | |
48 | ||
49 | /*-------------------------------------------------------------------------*/ | |
50 | ||
51 | /* | |
52 | * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. | |
53 | * Several dozen bytes of IPv4 data can fit in two such transactions. | |
54 | * One maximum size Ethernet packet takes twenty four of them. | |
55 | * For high speed, each frame comfortably fits almost 36 max size | |
56 | * Ethernet packets (so queues should be bigger). | |
f29fc259 DB |
57 | * |
58 | * REVISIT qlens should be members of 'struct usbnet'; the goal is to | |
59 | * let the USB host controller be busy for 5msec or more before an irq | |
60 | * is required, under load. Jumbograms change the equation. | |
1da177e4 | 61 | */ |
a99c1949 JP |
62 | #define RX_MAX_QUEUE_MEMORY (60 * 1518) |
63 | #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ | |
64 | (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4) | |
65 | #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ | |
66 | (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4) | |
1da177e4 | 67 | |
1da177e4 LT |
68 | // reawaken network queue this soon after stopping; else watchdog barks |
69 | #define TX_TIMEOUT_JIFFIES (5*HZ) | |
70 | ||
71 | // throttle rx/tx briefly after some faults, so khubd might disconnect() | |
72 | // us (it polls at HZ/4 usually) before we report too many false errors. | |
73 | #define THROTTLE_JIFFIES (HZ/8) | |
74 | ||
1da177e4 LT |
75 | // between wakeups |
76 | #define UNLINK_TIMEOUT_MS 3 | |
77 | ||
78 | /*-------------------------------------------------------------------------*/ | |
79 | ||
80 | // randomly generated ethernet address | |
81 | static u8 node_id [ETH_ALEN]; | |
82 | ||
1da177e4 LT |
83 | static const char driver_name [] = "usbnet"; |
84 | ||
85 | /* use ethtool to change the level for any given device */ | |
86 | static int msg_level = -1; | |
87 | module_param (msg_level, int, 0); | |
88 | MODULE_PARM_DESC (msg_level, "Override default message level"); | |
89 | ||
1da177e4 LT |
90 | /*-------------------------------------------------------------------------*/ |
91 | ||
1da177e4 | 92 | /* handles CDC Ethernet and many other network "bulk data" interfaces */ |
2e55cc72 | 93 | int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) |
1da177e4 LT |
94 | { |
95 | int tmp; | |
96 | struct usb_host_interface *alt = NULL; | |
97 | struct usb_host_endpoint *in = NULL, *out = NULL; | |
98 | struct usb_host_endpoint *status = NULL; | |
99 | ||
100 | for (tmp = 0; tmp < intf->num_altsetting; tmp++) { | |
101 | unsigned ep; | |
102 | ||
103 | in = out = status = NULL; | |
104 | alt = intf->altsetting + tmp; | |
105 | ||
106 | /* take the first altsetting with in-bulk + out-bulk; | |
107 | * remember any status endpoint, just in case; | |
108 | * ignore other endpoints and altsetttings. | |
109 | */ | |
110 | for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { | |
111 | struct usb_host_endpoint *e; | |
112 | int intr = 0; | |
113 | ||
114 | e = alt->endpoint + ep; | |
115 | switch (e->desc.bmAttributes) { | |
116 | case USB_ENDPOINT_XFER_INT: | |
fc6e2544 | 117 | if (!usb_endpoint_dir_in(&e->desc)) |
1da177e4 LT |
118 | continue; |
119 | intr = 1; | |
120 | /* FALLTHROUGH */ | |
121 | case USB_ENDPOINT_XFER_BULK: | |
122 | break; | |
123 | default: | |
124 | continue; | |
125 | } | |
fc6e2544 | 126 | if (usb_endpoint_dir_in(&e->desc)) { |
1da177e4 LT |
127 | if (!intr && !in) |
128 | in = e; | |
129 | else if (intr && !status) | |
130 | status = e; | |
131 | } else { | |
132 | if (!out) | |
133 | out = e; | |
134 | } | |
135 | } | |
136 | if (in && out) | |
137 | break; | |
138 | } | |
139 | if (!alt || !in || !out) | |
140 | return -EINVAL; | |
141 | ||
142 | if (alt->desc.bAlternateSetting != 0 | |
143 | || !(dev->driver_info->flags & FLAG_NO_SETINT)) { | |
144 | tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, | |
145 | alt->desc.bAlternateSetting); | |
146 | if (tmp < 0) | |
147 | return tmp; | |
148 | } | |
cb1cebbe | 149 | |
1da177e4 LT |
150 | dev->in = usb_rcvbulkpipe (dev->udev, |
151 | in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
152 | dev->out = usb_sndbulkpipe (dev->udev, | |
153 | out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
154 | dev->status = status; | |
155 | return 0; | |
156 | } | |
2e55cc72 | 157 | EXPORT_SYMBOL_GPL(usbnet_get_endpoints); |
1da177e4 | 158 | |
7d12e780 | 159 | static void intr_complete (struct urb *urb); |
1da177e4 LT |
160 | |
161 | static int init_status (struct usbnet *dev, struct usb_interface *intf) | |
162 | { | |
163 | char *buf = NULL; | |
164 | unsigned pipe = 0; | |
165 | unsigned maxp; | |
166 | unsigned period; | |
167 | ||
168 | if (!dev->driver_info->status) | |
169 | return 0; | |
170 | ||
171 | pipe = usb_rcvintpipe (dev->udev, | |
172 | dev->status->desc.bEndpointAddress | |
173 | & USB_ENDPOINT_NUMBER_MASK); | |
174 | maxp = usb_maxpacket (dev->udev, pipe, 0); | |
175 | ||
176 | /* avoid 1 msec chatter: min 8 msec poll rate */ | |
177 | period = max ((int) dev->status->desc.bInterval, | |
178 | (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); | |
179 | ||
e94b1766 | 180 | buf = kmalloc (maxp, GFP_KERNEL); |
1da177e4 | 181 | if (buf) { |
e94b1766 | 182 | dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); |
1da177e4 LT |
183 | if (!dev->interrupt) { |
184 | kfree (buf); | |
185 | return -ENOMEM; | |
186 | } else { | |
187 | usb_fill_int_urb(dev->interrupt, dev->udev, pipe, | |
188 | buf, maxp, intr_complete, dev, period); | |
189 | dev_dbg(&intf->dev, | |
190 | "status ep%din, %d bytes period %d\n", | |
191 | usb_pipeendpoint(pipe), maxp, period); | |
192 | } | |
193 | } | |
18ab458f | 194 | return 0; |
1da177e4 LT |
195 | } |
196 | ||
2e55cc72 DB |
197 | /* Passes this packet up the stack, updating its accounting. |
198 | * Some link protocols batch packets, so their rx_fixup paths | |
199 | * can return clones as well as just modify the original skb. | |
200 | */ | |
201 | void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) | |
1da177e4 LT |
202 | { |
203 | int status; | |
204 | ||
1da177e4 LT |
205 | skb->protocol = eth_type_trans (skb, dev->net); |
206 | dev->stats.rx_packets++; | |
207 | dev->stats.rx_bytes += skb->len; | |
208 | ||
209 | if (netif_msg_rx_status (dev)) | |
5330e927 | 210 | devdbg (dev, "< rx, len %zu, type 0x%x", |
1da177e4 LT |
211 | skb->len + sizeof (struct ethhdr), skb->protocol); |
212 | memset (skb->cb, 0, sizeof (struct skb_data)); | |
213 | status = netif_rx (skb); | |
214 | if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev)) | |
215 | devdbg (dev, "netif_rx status %d", status); | |
216 | } | |
2e55cc72 | 217 | EXPORT_SYMBOL_GPL(usbnet_skb_return); |
1da177e4 | 218 | |
1da177e4 LT |
219 | \f |
220 | /*------------------------------------------------------------------------- | |
221 | * | |
222 | * Network Device Driver (peer link to "Host Device", from USB host) | |
223 | * | |
224 | *-------------------------------------------------------------------------*/ | |
225 | ||
777baa47 | 226 | int usbnet_change_mtu (struct net_device *net, int new_mtu) |
1da177e4 LT |
227 | { |
228 | struct usbnet *dev = netdev_priv(net); | |
f29fc259 | 229 | int ll_mtu = new_mtu + net->hard_header_len; |
a99c1949 JP |
230 | int old_hard_mtu = dev->hard_mtu; |
231 | int old_rx_urb_size = dev->rx_urb_size; | |
1da177e4 | 232 | |
a99c1949 | 233 | if (new_mtu <= 0) |
1da177e4 | 234 | return -EINVAL; |
1da177e4 | 235 | // no second zero-length packet read wanted after mtu-sized packets |
f29fc259 | 236 | if ((ll_mtu % dev->maxpacket) == 0) |
1da177e4 LT |
237 | return -EDOM; |
238 | net->mtu = new_mtu; | |
a99c1949 JP |
239 | |
240 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
241 | if (dev->rx_urb_size == old_hard_mtu) { | |
242 | dev->rx_urb_size = dev->hard_mtu; | |
243 | if (dev->rx_urb_size > old_rx_urb_size) | |
244 | usbnet_unlink_rx_urbs(dev); | |
245 | } | |
246 | ||
1da177e4 LT |
247 | return 0; |
248 | } | |
777baa47 | 249 | EXPORT_SYMBOL_GPL(usbnet_change_mtu); |
1da177e4 LT |
250 | |
251 | /*-------------------------------------------------------------------------*/ | |
252 | ||
1da177e4 LT |
253 | /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from |
254 | * completion callbacks. 2.5 should have fixed those bugs... | |
255 | */ | |
256 | ||
8728b834 | 257 | static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) |
1da177e4 | 258 | { |
1da177e4 LT |
259 | unsigned long flags; |
260 | ||
8728b834 DM |
261 | spin_lock_irqsave(&list->lock, flags); |
262 | __skb_unlink(skb, list); | |
263 | spin_unlock(&list->lock); | |
264 | spin_lock(&dev->done.lock); | |
265 | __skb_queue_tail(&dev->done, skb); | |
1da177e4 | 266 | if (dev->done.qlen == 1) |
8728b834 DM |
267 | tasklet_schedule(&dev->bh); |
268 | spin_unlock_irqrestore(&dev->done.lock, flags); | |
1da177e4 LT |
269 | } |
270 | ||
271 | /* some work can't be done in tasklets, so we use keventd | |
272 | * | |
273 | * NOTE: annoying asymmetry: if it's active, schedule_work() fails, | |
274 | * but tasklet_schedule() doesn't. hope the failure is rare. | |
275 | */ | |
2e55cc72 | 276 | void usbnet_defer_kevent (struct usbnet *dev, int work) |
1da177e4 LT |
277 | { |
278 | set_bit (work, &dev->flags); | |
279 | if (!schedule_work (&dev->kevent)) | |
280 | deverr (dev, "kevent %d may have been dropped", work); | |
281 | else | |
282 | devdbg (dev, "kevent %d scheduled", work); | |
283 | } | |
2e55cc72 | 284 | EXPORT_SYMBOL_GPL(usbnet_defer_kevent); |
1da177e4 LT |
285 | |
286 | /*-------------------------------------------------------------------------*/ | |
287 | ||
7d12e780 | 288 | static void rx_complete (struct urb *urb); |
1da177e4 | 289 | |
55016f10 | 290 | static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) |
1da177e4 LT |
291 | { |
292 | struct sk_buff *skb; | |
293 | struct skb_data *entry; | |
294 | int retval = 0; | |
295 | unsigned long lockflags; | |
2e55cc72 | 296 | size_t size = dev->rx_urb_size; |
1da177e4 | 297 | |
1da177e4 LT |
298 | if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) { |
299 | if (netif_msg_rx_err (dev)) | |
300 | devdbg (dev, "no rx skb"); | |
2e55cc72 | 301 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
1da177e4 LT |
302 | usb_free_urb (urb); |
303 | return; | |
304 | } | |
305 | skb_reserve (skb, NET_IP_ALIGN); | |
306 | ||
307 | entry = (struct skb_data *) skb->cb; | |
308 | entry->urb = urb; | |
309 | entry->dev = dev; | |
310 | entry->state = rx_start; | |
311 | entry->length = 0; | |
312 | ||
313 | usb_fill_bulk_urb (urb, dev->udev, dev->in, | |
314 | skb->data, size, rx_complete, skb); | |
1da177e4 LT |
315 | |
316 | spin_lock_irqsave (&dev->rxq.lock, lockflags); | |
317 | ||
318 | if (netif_running (dev->net) | |
319 | && netif_device_present (dev->net) | |
320 | && !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
18ab458f | 321 | switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { |
1da177e4 | 322 | case -EPIPE: |
2e55cc72 | 323 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
1da177e4 LT |
324 | break; |
325 | case -ENOMEM: | |
2e55cc72 | 326 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
1da177e4 LT |
327 | break; |
328 | case -ENODEV: | |
329 | if (netif_msg_ifdown (dev)) | |
330 | devdbg (dev, "device gone"); | |
331 | netif_device_detach (dev->net); | |
332 | break; | |
333 | default: | |
334 | if (netif_msg_rx_err (dev)) | |
335 | devdbg (dev, "rx submit, %d", retval); | |
336 | tasklet_schedule (&dev->bh); | |
337 | break; | |
338 | case 0: | |
339 | __skb_queue_tail (&dev->rxq, skb); | |
340 | } | |
341 | } else { | |
342 | if (netif_msg_ifdown (dev)) | |
343 | devdbg (dev, "rx: stopped"); | |
344 | retval = -ENOLINK; | |
345 | } | |
346 | spin_unlock_irqrestore (&dev->rxq.lock, lockflags); | |
347 | if (retval) { | |
348 | dev_kfree_skb_any (skb); | |
349 | usb_free_urb (urb); | |
350 | } | |
351 | } | |
352 | ||
353 | ||
354 | /*-------------------------------------------------------------------------*/ | |
355 | ||
356 | static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) | |
357 | { | |
358 | if (dev->driver_info->rx_fixup | |
359 | && !dev->driver_info->rx_fixup (dev, skb)) | |
360 | goto error; | |
361 | // else network stack removes extra byte if we forced a short packet | |
362 | ||
363 | if (skb->len) | |
2e55cc72 | 364 | usbnet_skb_return (dev, skb); |
1da177e4 LT |
365 | else { |
366 | if (netif_msg_rx_err (dev)) | |
367 | devdbg (dev, "drop"); | |
368 | error: | |
369 | dev->stats.rx_errors++; | |
370 | skb_queue_tail (&dev->done, skb); | |
371 | } | |
372 | } | |
373 | ||
374 | /*-------------------------------------------------------------------------*/ | |
375 | ||
7d12e780 | 376 | static void rx_complete (struct urb *urb) |
1da177e4 LT |
377 | { |
378 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
379 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
380 | struct usbnet *dev = entry->dev; | |
381 | int urb_status = urb->status; | |
382 | ||
383 | skb_put (skb, urb->actual_length); | |
384 | entry->state = rx_done; | |
385 | entry->urb = NULL; | |
386 | ||
387 | switch (urb_status) { | |
18ab458f DB |
388 | /* success */ |
389 | case 0: | |
f29fc259 | 390 | if (skb->len < dev->net->hard_header_len) { |
1da177e4 LT |
391 | entry->state = rx_cleanup; |
392 | dev->stats.rx_errors++; | |
393 | dev->stats.rx_length_errors++; | |
394 | if (netif_msg_rx_err (dev)) | |
395 | devdbg (dev, "rx length %d", skb->len); | |
396 | } | |
397 | break; | |
398 | ||
18ab458f DB |
399 | /* stalls need manual reset. this is rare ... except that |
400 | * when going through USB 2.0 TTs, unplug appears this way. | |
401 | * we avoid the highspeed version of the ETIMEOUT/EILSEQ | |
402 | * storm, recovering as needed. | |
403 | */ | |
404 | case -EPIPE: | |
1da177e4 | 405 | dev->stats.rx_errors++; |
2e55cc72 | 406 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
1da177e4 LT |
407 | // FALLTHROUGH |
408 | ||
18ab458f DB |
409 | /* software-driven interface shutdown */ |
410 | case -ECONNRESET: /* async unlink */ | |
411 | case -ESHUTDOWN: /* hardware gone */ | |
1da177e4 LT |
412 | if (netif_msg_ifdown (dev)) |
413 | devdbg (dev, "rx shutdown, code %d", urb_status); | |
414 | goto block; | |
415 | ||
18ab458f DB |
416 | /* we get controller i/o faults during khubd disconnect() delays. |
417 | * throttle down resubmits, to avoid log floods; just temporarily, | |
418 | * so we still recover when the fault isn't a khubd delay. | |
419 | */ | |
420 | case -EPROTO: | |
421 | case -ETIME: | |
422 | case -EILSEQ: | |
1da177e4 LT |
423 | dev->stats.rx_errors++; |
424 | if (!timer_pending (&dev->delay)) { | |
425 | mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); | |
426 | if (netif_msg_link (dev)) | |
427 | devdbg (dev, "rx throttle %d", urb_status); | |
428 | } | |
429 | block: | |
430 | entry->state = rx_cleanup; | |
431 | entry->urb = urb; | |
432 | urb = NULL; | |
433 | break; | |
434 | ||
18ab458f DB |
435 | /* data overrun ... flush fifo? */ |
436 | case -EOVERFLOW: | |
1da177e4 LT |
437 | dev->stats.rx_over_errors++; |
438 | // FALLTHROUGH | |
cb1cebbe | 439 | |
18ab458f | 440 | default: |
1da177e4 LT |
441 | entry->state = rx_cleanup; |
442 | dev->stats.rx_errors++; | |
443 | if (netif_msg_rx_err (dev)) | |
444 | devdbg (dev, "rx status %d", urb_status); | |
445 | break; | |
446 | } | |
447 | ||
8728b834 | 448 | defer_bh(dev, skb, &dev->rxq); |
1da177e4 LT |
449 | |
450 | if (urb) { | |
451 | if (netif_running (dev->net) | |
452 | && !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
453 | rx_submit (dev, urb, GFP_ATOMIC); | |
454 | return; | |
455 | } | |
456 | usb_free_urb (urb); | |
457 | } | |
458 | if (netif_msg_rx_err (dev)) | |
459 | devdbg (dev, "no read resubmitted"); | |
460 | } | |
461 | ||
7d12e780 | 462 | static void intr_complete (struct urb *urb) |
1da177e4 LT |
463 | { |
464 | struct usbnet *dev = urb->context; | |
465 | int status = urb->status; | |
466 | ||
467 | switch (status) { | |
18ab458f DB |
468 | /* success */ |
469 | case 0: | |
1da177e4 LT |
470 | dev->driver_info->status(dev, urb); |
471 | break; | |
472 | ||
18ab458f DB |
473 | /* software-driven interface shutdown */ |
474 | case -ENOENT: /* urb killed */ | |
475 | case -ESHUTDOWN: /* hardware gone */ | |
1da177e4 LT |
476 | if (netif_msg_ifdown (dev)) |
477 | devdbg (dev, "intr shutdown, code %d", status); | |
478 | return; | |
479 | ||
18ab458f DB |
480 | /* NOTE: not throttling like RX/TX, since this endpoint |
481 | * already polls infrequently | |
482 | */ | |
483 | default: | |
1da177e4 LT |
484 | devdbg (dev, "intr status %d", status); |
485 | break; | |
486 | } | |
487 | ||
488 | if (!netif_running (dev->net)) | |
489 | return; | |
490 | ||
491 | memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); | |
492 | status = usb_submit_urb (urb, GFP_ATOMIC); | |
493 | if (status != 0 && netif_msg_timer (dev)) | |
494 | deverr(dev, "intr resubmit --> %d", status); | |
495 | } | |
496 | ||
497 | /*-------------------------------------------------------------------------*/ | |
498 | ||
499 | // unlink pending rx/tx; completion handlers do all other cleanup | |
500 | ||
501 | static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) | |
502 | { | |
503 | unsigned long flags; | |
504 | struct sk_buff *skb, *skbnext; | |
505 | int count = 0; | |
506 | ||
507 | spin_lock_irqsave (&q->lock, flags); | |
83bfba5f | 508 | skb_queue_walk_safe(q, skb, skbnext) { |
1da177e4 LT |
509 | struct skb_data *entry; |
510 | struct urb *urb; | |
511 | int retval; | |
512 | ||
513 | entry = (struct skb_data *) skb->cb; | |
514 | urb = entry->urb; | |
1da177e4 LT |
515 | |
516 | // during some PM-driven resume scenarios, | |
517 | // these (async) unlinks complete immediately | |
518 | retval = usb_unlink_urb (urb); | |
519 | if (retval != -EINPROGRESS && retval != 0) | |
520 | devdbg (dev, "unlink urb err, %d", retval); | |
521 | else | |
522 | count++; | |
523 | } | |
524 | spin_unlock_irqrestore (&q->lock, flags); | |
525 | return count; | |
526 | } | |
527 | ||
a99c1949 JP |
528 | // Flush all pending rx urbs |
529 | // minidrivers may need to do this when the MTU changes | |
530 | ||
531 | void usbnet_unlink_rx_urbs(struct usbnet *dev) | |
532 | { | |
533 | if (netif_running(dev->net)) { | |
534 | (void) unlink_urbs (dev, &dev->rxq); | |
535 | tasklet_schedule(&dev->bh); | |
536 | } | |
537 | } | |
538 | EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); | |
1da177e4 LT |
539 | |
540 | /*-------------------------------------------------------------------------*/ | |
541 | ||
542 | // precondition: never called in_interrupt | |
543 | ||
777baa47 | 544 | int usbnet_stop (struct net_device *net) |
1da177e4 LT |
545 | { |
546 | struct usbnet *dev = netdev_priv(net); | |
547 | int temp; | |
7259f0d0 | 548 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup); |
1da177e4 LT |
549 | DECLARE_WAITQUEUE (wait, current); |
550 | ||
551 | netif_stop_queue (net); | |
552 | ||
553 | if (netif_msg_ifdown (dev)) | |
554 | devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld", | |
cb1cebbe | 555 | dev->stats.rx_packets, dev->stats.tx_packets, |
1da177e4 LT |
556 | dev->stats.rx_errors, dev->stats.tx_errors |
557 | ); | |
558 | ||
559 | // ensure there are no more active urbs | |
560 | add_wait_queue (&unlink_wakeup, &wait); | |
561 | dev->wait = &unlink_wakeup; | |
562 | temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq); | |
563 | ||
564 | // maybe wait for deletions to finish. | |
18ab458f DB |
565 | while (!skb_queue_empty(&dev->rxq) |
566 | && !skb_queue_empty(&dev->txq) | |
567 | && !skb_queue_empty(&dev->done)) { | |
1da177e4 LT |
568 | msleep(UNLINK_TIMEOUT_MS); |
569 | if (netif_msg_ifdown (dev)) | |
570 | devdbg (dev, "waited for %d urb completions", temp); | |
571 | } | |
572 | dev->wait = NULL; | |
cb1cebbe | 573 | remove_wait_queue (&unlink_wakeup, &wait); |
1da177e4 LT |
574 | |
575 | usb_kill_urb(dev->interrupt); | |
576 | ||
577 | /* deferred work (task, timer, softirq) must also stop. | |
578 | * can't flush_scheduled_work() until we drop rtnl (later), | |
579 | * else workers could deadlock; so make workers a NOP. | |
580 | */ | |
581 | dev->flags = 0; | |
582 | del_timer_sync (&dev->delay); | |
583 | tasklet_kill (&dev->bh); | |
a11a6544 | 584 | usb_autopm_put_interface(dev->intf); |
1da177e4 LT |
585 | |
586 | return 0; | |
587 | } | |
777baa47 | 588 | EXPORT_SYMBOL_GPL(usbnet_stop); |
1da177e4 LT |
589 | |
590 | /*-------------------------------------------------------------------------*/ | |
591 | ||
592 | // posts reads, and enables write queuing | |
593 | ||
594 | // precondition: never called in_interrupt | |
595 | ||
777baa47 | 596 | int usbnet_open (struct net_device *net) |
1da177e4 LT |
597 | { |
598 | struct usbnet *dev = netdev_priv(net); | |
a11a6544 | 599 | int retval; |
1da177e4 LT |
600 | struct driver_info *info = dev->driver_info; |
601 | ||
a11a6544 ON |
602 | if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { |
603 | if (netif_msg_ifup (dev)) | |
604 | devinfo (dev, | |
605 | "resumption fail (%d) usbnet usb-%s-%s, %s", | |
606 | retval, | |
607 | dev->udev->bus->bus_name, dev->udev->devpath, | |
608 | info->description); | |
609 | goto done_nopm; | |
610 | } | |
611 | ||
1da177e4 LT |
612 | // put into "known safe" state |
613 | if (info->reset && (retval = info->reset (dev)) < 0) { | |
614 | if (netif_msg_ifup (dev)) | |
615 | devinfo (dev, | |
616 | "open reset fail (%d) usbnet usb-%s-%s, %s", | |
617 | retval, | |
618 | dev->udev->bus->bus_name, dev->udev->devpath, | |
619 | info->description); | |
620 | goto done; | |
621 | } | |
622 | ||
623 | // insist peer be connected | |
624 | if (info->check_connect && (retval = info->check_connect (dev)) < 0) { | |
625 | if (netif_msg_ifup (dev)) | |
626 | devdbg (dev, "can't open; %d", retval); | |
627 | goto done; | |
628 | } | |
629 | ||
630 | /* start any status interrupt transfer */ | |
631 | if (dev->interrupt) { | |
632 | retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); | |
633 | if (retval < 0) { | |
634 | if (netif_msg_ifup (dev)) | |
635 | deverr (dev, "intr submit %d", retval); | |
636 | goto done; | |
637 | } | |
638 | } | |
639 | ||
640 | netif_start_queue (net); | |
641 | if (netif_msg_ifup (dev)) { | |
642 | char *framing; | |
643 | ||
644 | if (dev->driver_info->flags & FLAG_FRAMING_NC) | |
645 | framing = "NetChip"; | |
646 | else if (dev->driver_info->flags & FLAG_FRAMING_GL) | |
647 | framing = "GeneSys"; | |
648 | else if (dev->driver_info->flags & FLAG_FRAMING_Z) | |
649 | framing = "Zaurus"; | |
650 | else if (dev->driver_info->flags & FLAG_FRAMING_RN) | |
651 | framing = "RNDIS"; | |
652 | else if (dev->driver_info->flags & FLAG_FRAMING_AX) | |
653 | framing = "ASIX"; | |
654 | else | |
655 | framing = "simple"; | |
656 | ||
657 | devinfo (dev, "open: enable queueing " | |
658 | "(rx %d, tx %d) mtu %d %s framing", | |
25d94e68 | 659 | (int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu, |
1da177e4 LT |
660 | framing); |
661 | } | |
662 | ||
663 | // delay posting reads until we're fully open | |
664 | tasklet_schedule (&dev->bh); | |
a11a6544 | 665 | return retval; |
1da177e4 | 666 | done: |
a11a6544 ON |
667 | usb_autopm_put_interface(dev->intf); |
668 | done_nopm: | |
1da177e4 LT |
669 | return retval; |
670 | } | |
777baa47 | 671 | EXPORT_SYMBOL_GPL(usbnet_open); |
1da177e4 LT |
672 | |
673 | /*-------------------------------------------------------------------------*/ | |
674 | ||
2e55cc72 DB |
675 | /* ethtool methods; minidrivers may need to add some more, but |
676 | * they'll probably want to use this base set. | |
677 | */ | |
678 | ||
c41286fd AB |
679 | int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) |
680 | { | |
681 | struct usbnet *dev = netdev_priv(net); | |
682 | ||
683 | if (!dev->mii.mdio_read) | |
684 | return -EOPNOTSUPP; | |
685 | ||
686 | return mii_ethtool_gset(&dev->mii, cmd); | |
687 | } | |
688 | EXPORT_SYMBOL_GPL(usbnet_get_settings); | |
689 | ||
690 | int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) | |
691 | { | |
692 | struct usbnet *dev = netdev_priv(net); | |
693 | int retval; | |
694 | ||
695 | if (!dev->mii.mdio_write) | |
696 | return -EOPNOTSUPP; | |
697 | ||
698 | retval = mii_ethtool_sset(&dev->mii, cmd); | |
699 | ||
700 | /* link speed/duplex might have changed */ | |
701 | if (dev->driver_info->link_reset) | |
702 | dev->driver_info->link_reset(dev); | |
703 | ||
704 | return retval; | |
705 | ||
706 | } | |
707 | EXPORT_SYMBOL_GPL(usbnet_set_settings); | |
708 | ||
c41286fd | 709 | u32 usbnet_get_link (struct net_device *net) |
1da177e4 LT |
710 | { |
711 | struct usbnet *dev = netdev_priv(net); | |
712 | ||
f29fc259 | 713 | /* If a check_connect is defined, return its result */ |
1da177e4 LT |
714 | if (dev->driver_info->check_connect) |
715 | return dev->driver_info->check_connect (dev) == 0; | |
716 | ||
c41286fd AB |
717 | /* if the device has mii operations, use those */ |
718 | if (dev->mii.mdio_read) | |
719 | return mii_link_ok(&dev->mii); | |
720 | ||
05ffb3e2 BM |
721 | /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ |
722 | return ethtool_op_get_link(net); | |
1da177e4 | 723 | } |
c41286fd | 724 | EXPORT_SYMBOL_GPL(usbnet_get_link); |
1da177e4 | 725 | |
18ee91fa | 726 | int usbnet_nway_reset(struct net_device *net) |
1da177e4 LT |
727 | { |
728 | struct usbnet *dev = netdev_priv(net); | |
729 | ||
18ee91fa DB |
730 | if (!dev->mii.mdio_write) |
731 | return -EOPNOTSUPP; | |
732 | ||
733 | return mii_nway_restart(&dev->mii); | |
1da177e4 | 734 | } |
18ee91fa | 735 | EXPORT_SYMBOL_GPL(usbnet_nway_reset); |
1da177e4 | 736 | |
18ee91fa | 737 | void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) |
1da177e4 LT |
738 | { |
739 | struct usbnet *dev = netdev_priv(net); | |
740 | ||
296c0242 | 741 | strncpy (info->driver, dev->driver_name, sizeof info->driver); |
18ee91fa DB |
742 | strncpy (info->version, DRIVER_VERSION, sizeof info->version); |
743 | strncpy (info->fw_version, dev->driver_info->description, | |
744 | sizeof info->fw_version); | |
745 | usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); | |
1da177e4 | 746 | } |
18ee91fa | 747 | EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); |
1da177e4 | 748 | |
18ee91fa | 749 | u32 usbnet_get_msglevel (struct net_device *net) |
c41286fd AB |
750 | { |
751 | struct usbnet *dev = netdev_priv(net); | |
752 | ||
18ee91fa DB |
753 | return dev->msg_enable; |
754 | } | |
755 | EXPORT_SYMBOL_GPL(usbnet_get_msglevel); | |
c41286fd | 756 | |
18ee91fa DB |
757 | void usbnet_set_msglevel (struct net_device *net, u32 level) |
758 | { | |
759 | struct usbnet *dev = netdev_priv(net); | |
760 | ||
761 | dev->msg_enable = level; | |
c41286fd | 762 | } |
18ee91fa | 763 | EXPORT_SYMBOL_GPL(usbnet_set_msglevel); |
c41286fd | 764 | |
2e55cc72 DB |
765 | /* drivers may override default ethtool_ops in their bind() routine */ |
766 | static struct ethtool_ops usbnet_ethtool_ops = { | |
c41286fd AB |
767 | .get_settings = usbnet_get_settings, |
768 | .set_settings = usbnet_set_settings, | |
2e55cc72 | 769 | .get_link = usbnet_get_link, |
c41286fd | 770 | .nway_reset = usbnet_nway_reset, |
18ee91fa | 771 | .get_drvinfo = usbnet_get_drvinfo, |
2e55cc72 DB |
772 | .get_msglevel = usbnet_get_msglevel, |
773 | .set_msglevel = usbnet_set_msglevel, | |
774 | }; | |
1da177e4 LT |
775 | |
776 | /*-------------------------------------------------------------------------*/ | |
777 | ||
778 | /* work that cannot be done in interrupt context uses keventd. | |
779 | * | |
780 | * NOTE: with 2.5 we could do more of this using completion callbacks, | |
781 | * especially now that control transfers can be queued. | |
782 | */ | |
783 | static void | |
c4028958 | 784 | kevent (struct work_struct *work) |
1da177e4 | 785 | { |
c4028958 DH |
786 | struct usbnet *dev = |
787 | container_of(work, struct usbnet, kevent); | |
1da177e4 LT |
788 | int status; |
789 | ||
790 | /* usb_clear_halt() needs a thread context */ | |
791 | if (test_bit (EVENT_TX_HALT, &dev->flags)) { | |
792 | unlink_urbs (dev, &dev->txq); | |
793 | status = usb_clear_halt (dev->udev, dev->out); | |
f29fc259 DB |
794 | if (status < 0 |
795 | && status != -EPIPE | |
796 | && status != -ESHUTDOWN) { | |
1da177e4 LT |
797 | if (netif_msg_tx_err (dev)) |
798 | deverr (dev, "can't clear tx halt, status %d", | |
799 | status); | |
800 | } else { | |
801 | clear_bit (EVENT_TX_HALT, &dev->flags); | |
f29fc259 DB |
802 | if (status != -ESHUTDOWN) |
803 | netif_wake_queue (dev->net); | |
1da177e4 LT |
804 | } |
805 | } | |
806 | if (test_bit (EVENT_RX_HALT, &dev->flags)) { | |
807 | unlink_urbs (dev, &dev->rxq); | |
808 | status = usb_clear_halt (dev->udev, dev->in); | |
f29fc259 DB |
809 | if (status < 0 |
810 | && status != -EPIPE | |
811 | && status != -ESHUTDOWN) { | |
1da177e4 LT |
812 | if (netif_msg_rx_err (dev)) |
813 | deverr (dev, "can't clear rx halt, status %d", | |
814 | status); | |
815 | } else { | |
816 | clear_bit (EVENT_RX_HALT, &dev->flags); | |
817 | tasklet_schedule (&dev->bh); | |
818 | } | |
819 | } | |
820 | ||
821 | /* tasklet could resubmit itself forever if memory is tight */ | |
822 | if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { | |
823 | struct urb *urb = NULL; | |
824 | ||
825 | if (netif_running (dev->net)) | |
826 | urb = usb_alloc_urb (0, GFP_KERNEL); | |
827 | else | |
828 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
829 | if (urb != NULL) { | |
830 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
831 | rx_submit (dev, urb, GFP_KERNEL); | |
832 | tasklet_schedule (&dev->bh); | |
833 | } | |
834 | } | |
835 | ||
7ea13c9c | 836 | if (test_bit (EVENT_LINK_RESET, &dev->flags)) { |
cb1cebbe | 837 | struct driver_info *info = dev->driver_info; |
7ea13c9c DH |
838 | int retval = 0; |
839 | ||
840 | clear_bit (EVENT_LINK_RESET, &dev->flags); | |
841 | if(info->link_reset && (retval = info->link_reset(dev)) < 0) { | |
842 | devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s", | |
843 | retval, | |
844 | dev->udev->bus->bus_name, dev->udev->devpath, | |
845 | info->description); | |
846 | } | |
847 | } | |
848 | ||
1da177e4 LT |
849 | if (dev->flags) |
850 | devdbg (dev, "kevent done, flags = 0x%lx", | |
851 | dev->flags); | |
852 | } | |
853 | ||
854 | /*-------------------------------------------------------------------------*/ | |
855 | ||
7d12e780 | 856 | static void tx_complete (struct urb *urb) |
1da177e4 LT |
857 | { |
858 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
859 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
860 | struct usbnet *dev = entry->dev; | |
861 | ||
862 | if (urb->status == 0) { | |
863 | dev->stats.tx_packets++; | |
864 | dev->stats.tx_bytes += entry->length; | |
865 | } else { | |
866 | dev->stats.tx_errors++; | |
867 | ||
868 | switch (urb->status) { | |
869 | case -EPIPE: | |
2e55cc72 | 870 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
1da177e4 LT |
871 | break; |
872 | ||
873 | /* software-driven interface shutdown */ | |
874 | case -ECONNRESET: // async unlink | |
875 | case -ESHUTDOWN: // hardware gone | |
876 | break; | |
877 | ||
878 | // like rx, tx gets controller i/o faults during khubd delays | |
879 | // and so it uses the same throttling mechanism. | |
38e2bfc9 PZ |
880 | case -EPROTO: |
881 | case -ETIME: | |
882 | case -EILSEQ: | |
1da177e4 LT |
883 | if (!timer_pending (&dev->delay)) { |
884 | mod_timer (&dev->delay, | |
885 | jiffies + THROTTLE_JIFFIES); | |
886 | if (netif_msg_link (dev)) | |
887 | devdbg (dev, "tx throttle %d", | |
888 | urb->status); | |
889 | } | |
890 | netif_stop_queue (dev->net); | |
891 | break; | |
892 | default: | |
893 | if (netif_msg_tx_err (dev)) | |
894 | devdbg (dev, "tx err %d", entry->urb->status); | |
895 | break; | |
896 | } | |
897 | } | |
898 | ||
899 | urb->dev = NULL; | |
900 | entry->state = tx_done; | |
8728b834 | 901 | defer_bh(dev, skb, &dev->txq); |
1da177e4 LT |
902 | } |
903 | ||
904 | /*-------------------------------------------------------------------------*/ | |
905 | ||
777baa47 | 906 | void usbnet_tx_timeout (struct net_device *net) |
1da177e4 LT |
907 | { |
908 | struct usbnet *dev = netdev_priv(net); | |
909 | ||
910 | unlink_urbs (dev, &dev->txq); | |
911 | tasklet_schedule (&dev->bh); | |
912 | ||
913 | // FIXME: device recovery -- reset? | |
914 | } | |
777baa47 | 915 | EXPORT_SYMBOL_GPL(usbnet_tx_timeout); |
1da177e4 LT |
916 | |
917 | /*-------------------------------------------------------------------------*/ | |
918 | ||
777baa47 | 919 | int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net) |
1da177e4 LT |
920 | { |
921 | struct usbnet *dev = netdev_priv(net); | |
922 | int length; | |
923 | int retval = NET_XMIT_SUCCESS; | |
924 | struct urb *urb = NULL; | |
925 | struct skb_data *entry; | |
926 | struct driver_info *info = dev->driver_info; | |
927 | unsigned long flags; | |
1da177e4 LT |
928 | |
929 | // some devices want funky USB-level framing, for | |
930 | // win32 driver (usually) and/or hardware quirks | |
931 | if (info->tx_fixup) { | |
932 | skb = info->tx_fixup (dev, skb, GFP_ATOMIC); | |
933 | if (!skb) { | |
934 | if (netif_msg_tx_err (dev)) | |
935 | devdbg (dev, "can't tx_fixup skb"); | |
936 | goto drop; | |
937 | } | |
938 | } | |
939 | length = skb->len; | |
940 | ||
941 | if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { | |
942 | if (netif_msg_tx_err (dev)) | |
943 | devdbg (dev, "no urb"); | |
944 | goto drop; | |
945 | } | |
946 | ||
947 | entry = (struct skb_data *) skb->cb; | |
948 | entry->urb = urb; | |
949 | entry->dev = dev; | |
950 | entry->state = tx_start; | |
951 | entry->length = length; | |
952 | ||
1da177e4 LT |
953 | usb_fill_bulk_urb (urb, dev->udev, dev->out, |
954 | skb->data, skb->len, tx_complete, skb); | |
1da177e4 LT |
955 | |
956 | /* don't assume the hardware handles USB_ZERO_PACKET | |
957 | * NOTE: strictly conforming cdc-ether devices should expect | |
958 | * the ZLP here, but ignore the one-byte packet. | |
1da177e4 | 959 | */ |
3e323f3e | 960 | if ((length % dev->maxpacket) == 0) { |
1da177e4 | 961 | urb->transfer_buffer_length++; |
3e323f3e PK |
962 | if (skb_tailroom(skb)) { |
963 | skb->data[skb->len] = 0; | |
964 | __skb_put(skb, 1); | |
965 | } | |
966 | } | |
1da177e4 LT |
967 | |
968 | spin_lock_irqsave (&dev->txq.lock, flags); | |
969 | ||
1da177e4 LT |
970 | switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { |
971 | case -EPIPE: | |
972 | netif_stop_queue (net); | |
2e55cc72 | 973 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
1da177e4 LT |
974 | break; |
975 | default: | |
976 | if (netif_msg_tx_err (dev)) | |
977 | devdbg (dev, "tx: submit urb err %d", retval); | |
978 | break; | |
979 | case 0: | |
980 | net->trans_start = jiffies; | |
981 | __skb_queue_tail (&dev->txq, skb); | |
982 | if (dev->txq.qlen >= TX_QLEN (dev)) | |
983 | netif_stop_queue (net); | |
984 | } | |
985 | spin_unlock_irqrestore (&dev->txq.lock, flags); | |
986 | ||
987 | if (retval) { | |
988 | if (netif_msg_tx_err (dev)) | |
989 | devdbg (dev, "drop, code %d", retval); | |
990 | drop: | |
991 | retval = NET_XMIT_SUCCESS; | |
992 | dev->stats.tx_dropped++; | |
993 | if (skb) | |
994 | dev_kfree_skb_any (skb); | |
995 | usb_free_urb (urb); | |
996 | } else if (netif_msg_tx_queued (dev)) { | |
997 | devdbg (dev, "> tx, len %d, type 0x%x", | |
998 | length, skb->protocol); | |
999 | } | |
1000 | return retval; | |
1001 | } | |
777baa47 | 1002 | EXPORT_SYMBOL_GPL(usbnet_start_xmit); |
1da177e4 LT |
1003 | |
1004 | /*-------------------------------------------------------------------------*/ | |
1005 | ||
1006 | // tasklet (work deferred from completions, in_irq) or timer | |
1007 | ||
1008 | static void usbnet_bh (unsigned long param) | |
1009 | { | |
1010 | struct usbnet *dev = (struct usbnet *) param; | |
1011 | struct sk_buff *skb; | |
1012 | struct skb_data *entry; | |
1013 | ||
1014 | while ((skb = skb_dequeue (&dev->done))) { | |
1015 | entry = (struct skb_data *) skb->cb; | |
1016 | switch (entry->state) { | |
18ab458f | 1017 | case rx_done: |
1da177e4 LT |
1018 | entry->state = rx_cleanup; |
1019 | rx_process (dev, skb); | |
1020 | continue; | |
18ab458f DB |
1021 | case tx_done: |
1022 | case rx_cleanup: | |
1da177e4 LT |
1023 | usb_free_urb (entry->urb); |
1024 | dev_kfree_skb (skb); | |
1025 | continue; | |
18ab458f | 1026 | default: |
1da177e4 LT |
1027 | devdbg (dev, "bogus skb state %d", entry->state); |
1028 | } | |
1029 | } | |
1030 | ||
1031 | // waiting for all pending urbs to complete? | |
1032 | if (dev->wait) { | |
1033 | if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { | |
1034 | wake_up (dev->wait); | |
1035 | } | |
1036 | ||
1037 | // or are we maybe short a few urbs? | |
1038 | } else if (netif_running (dev->net) | |
1039 | && netif_device_present (dev->net) | |
1040 | && !timer_pending (&dev->delay) | |
1041 | && !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
1042 | int temp = dev->rxq.qlen; | |
1043 | int qlen = RX_QLEN (dev); | |
1044 | ||
1045 | if (temp < qlen) { | |
1046 | struct urb *urb; | |
1047 | int i; | |
1048 | ||
1049 | // don't refill the queue all at once | |
1050 | for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { | |
1051 | urb = usb_alloc_urb (0, GFP_ATOMIC); | |
1052 | if (urb != NULL) | |
1053 | rx_submit (dev, urb, GFP_ATOMIC); | |
1054 | } | |
1055 | if (temp != dev->rxq.qlen && netif_msg_link (dev)) | |
1056 | devdbg (dev, "rxqlen %d --> %d", | |
1057 | temp, dev->rxq.qlen); | |
1058 | if (dev->rxq.qlen < qlen) | |
1059 | tasklet_schedule (&dev->bh); | |
1060 | } | |
1061 | if (dev->txq.qlen < TX_QLEN (dev)) | |
1062 | netif_wake_queue (dev->net); | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | ||
1067 | \f | |
1068 | /*------------------------------------------------------------------------- | |
1069 | * | |
1070 | * USB Device Driver support | |
1071 | * | |
1072 | *-------------------------------------------------------------------------*/ | |
cb1cebbe | 1073 | |
1da177e4 LT |
1074 | // precondition: never called in_interrupt |
1075 | ||
38bde1d4 | 1076 | void usbnet_disconnect (struct usb_interface *intf) |
1da177e4 LT |
1077 | { |
1078 | struct usbnet *dev; | |
1079 | struct usb_device *xdev; | |
1080 | struct net_device *net; | |
1081 | ||
1082 | dev = usb_get_intfdata(intf); | |
1083 | usb_set_intfdata(intf, NULL); | |
1084 | if (!dev) | |
1085 | return; | |
1086 | ||
1087 | xdev = interface_to_usbdev (intf); | |
1088 | ||
1089 | if (netif_msg_probe (dev)) | |
38bde1d4 DB |
1090 | devinfo (dev, "unregister '%s' usb-%s-%s, %s", |
1091 | intf->dev.driver->name, | |
1da177e4 LT |
1092 | xdev->bus->bus_name, xdev->devpath, |
1093 | dev->driver_info->description); | |
cb1cebbe | 1094 | |
1da177e4 LT |
1095 | net = dev->net; |
1096 | unregister_netdev (net); | |
1097 | ||
1098 | /* we don't hold rtnl here ... */ | |
1099 | flush_scheduled_work (); | |
1100 | ||
1101 | if (dev->driver_info->unbind) | |
1102 | dev->driver_info->unbind (dev, intf); | |
1103 | ||
1104 | free_netdev(net); | |
1105 | usb_put_dev (xdev); | |
1106 | } | |
38bde1d4 | 1107 | EXPORT_SYMBOL_GPL(usbnet_disconnect); |
1da177e4 | 1108 | |
777baa47 SH |
1109 | static const struct net_device_ops usbnet_netdev_ops = { |
1110 | .ndo_open = usbnet_open, | |
1111 | .ndo_stop = usbnet_stop, | |
1112 | .ndo_start_xmit = usbnet_start_xmit, | |
1113 | .ndo_tx_timeout = usbnet_tx_timeout, | |
1114 | .ndo_change_mtu = usbnet_change_mtu, | |
1115 | .ndo_set_mac_address = eth_mac_addr, | |
1116 | .ndo_validate_addr = eth_validate_addr, | |
1117 | }; | |
1da177e4 LT |
1118 | |
1119 | /*-------------------------------------------------------------------------*/ | |
1120 | ||
1da177e4 LT |
1121 | // precondition: never called in_interrupt |
1122 | ||
38bde1d4 | 1123 | int |
1da177e4 LT |
1124 | usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) |
1125 | { | |
1126 | struct usbnet *dev; | |
cb1cebbe | 1127 | struct net_device *net; |
1da177e4 LT |
1128 | struct usb_host_interface *interface; |
1129 | struct driver_info *info; | |
1130 | struct usb_device *xdev; | |
1131 | int status; | |
296c0242 | 1132 | const char *name; |
1da177e4 | 1133 | |
296c0242 | 1134 | name = udev->dev.driver->name; |
1da177e4 LT |
1135 | info = (struct driver_info *) prod->driver_info; |
1136 | if (!info) { | |
296c0242 | 1137 | dev_dbg (&udev->dev, "blacklisted by %s\n", name); |
1da177e4 LT |
1138 | return -ENODEV; |
1139 | } | |
1140 | xdev = interface_to_usbdev (udev); | |
1141 | interface = udev->cur_altsetting; | |
1142 | ||
1143 | usb_get_dev (xdev); | |
1144 | ||
1145 | status = -ENOMEM; | |
1146 | ||
1147 | // set up our own records | |
1148 | net = alloc_etherdev(sizeof(*dev)); | |
1149 | if (!net) { | |
1150 | dbg ("can't kmalloc dev"); | |
1151 | goto out; | |
1152 | } | |
1153 | ||
1154 | dev = netdev_priv(net); | |
1155 | dev->udev = xdev; | |
a11a6544 | 1156 | dev->intf = udev; |
1da177e4 | 1157 | dev->driver_info = info; |
296c0242 | 1158 | dev->driver_name = name; |
1da177e4 LT |
1159 | dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV |
1160 | | NETIF_MSG_PROBE | NETIF_MSG_LINK); | |
1161 | skb_queue_head_init (&dev->rxq); | |
1162 | skb_queue_head_init (&dev->txq); | |
1163 | skb_queue_head_init (&dev->done); | |
1164 | dev->bh.func = usbnet_bh; | |
1165 | dev->bh.data = (unsigned long) dev; | |
c4028958 | 1166 | INIT_WORK (&dev->kevent, kevent); |
1da177e4 LT |
1167 | dev->delay.function = usbnet_bh; |
1168 | dev->delay.data = (unsigned long) dev; | |
1169 | init_timer (&dev->delay); | |
a9fc6338 | 1170 | mutex_init (&dev->phy_mutex); |
1da177e4 | 1171 | |
1da177e4 LT |
1172 | dev->net = net; |
1173 | strcpy (net->name, "usb%d"); | |
1174 | memcpy (net->dev_addr, node_id, sizeof node_id); | |
1175 | ||
2e55cc72 DB |
1176 | /* rx and tx sides can use different message sizes; |
1177 | * bind() should set rx_urb_size in that case. | |
1178 | */ | |
1179 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
1da177e4 LT |
1180 | #if 0 |
1181 | // dma_supported() is deeply broken on almost all architectures | |
1182 | // possible with some EHCI controllers | |
6a35528a | 1183 | if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) |
1da177e4 LT |
1184 | net->features |= NETIF_F_HIGHDMA; |
1185 | #endif | |
1186 | ||
777baa47 SH |
1187 | net->netdev_ops = &usbnet_netdev_ops; |
1188 | #ifdef CONFIG_COMPAT_NET_DEV_OPS | |
1da177e4 LT |
1189 | net->hard_start_xmit = usbnet_start_xmit; |
1190 | net->open = usbnet_open; | |
1191 | net->stop = usbnet_stop; | |
1da177e4 | 1192 | net->tx_timeout = usbnet_tx_timeout; |
777baa47 SH |
1193 | #endif |
1194 | net->watchdog_timeo = TX_TIMEOUT_JIFFIES; | |
1da177e4 LT |
1195 | net->ethtool_ops = &usbnet_ethtool_ops; |
1196 | ||
1197 | // allow device-specific bind/init procedures | |
1198 | // NOTE net->name still not usable ... | |
1199 | if (info->bind) { | |
1200 | status = info->bind (dev, udev); | |
cb1cebbe DB |
1201 | if (status < 0) |
1202 | goto out1; | |
1203 | ||
1da177e4 LT |
1204 | // heuristic: "usb%d" for links we know are two-host, |
1205 | // else "eth%d" when there's reasonable doubt. userspace | |
1206 | // can rename the link if it knows better. | |
1207 | if ((dev->driver_info->flags & FLAG_ETHER) != 0 | |
1208 | && (net->dev_addr [0] & 0x02) == 0) | |
1209 | strcpy (net->name, "eth%d"); | |
6e3bbcc5 JK |
1210 | /* WLAN devices should always be named "wlan%d" */ |
1211 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) | |
1212 | strcpy(net->name, "wlan%d"); | |
f29fc259 DB |
1213 | |
1214 | /* maybe the remote can't receive an Ethernet MTU */ | |
1215 | if (net->mtu > (dev->hard_mtu - net->hard_header_len)) | |
1216 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
2e55cc72 DB |
1217 | } else if (!info->in || !info->out) |
1218 | status = usbnet_get_endpoints (dev, udev); | |
1da177e4 LT |
1219 | else { |
1220 | dev->in = usb_rcvbulkpipe (xdev, info->in); | |
1221 | dev->out = usb_sndbulkpipe (xdev, info->out); | |
1222 | if (!(info->flags & FLAG_NO_SETINT)) | |
1223 | status = usb_set_interface (xdev, | |
1224 | interface->desc.bInterfaceNumber, | |
1225 | interface->desc.bAlternateSetting); | |
1226 | else | |
1227 | status = 0; | |
1228 | ||
1229 | } | |
9514bfe5 | 1230 | if (status >= 0 && dev->status) |
1da177e4 LT |
1231 | status = init_status (dev, udev); |
1232 | if (status < 0) | |
cb1cebbe | 1233 | goto out3; |
1da177e4 | 1234 | |
2e55cc72 DB |
1235 | if (!dev->rx_urb_size) |
1236 | dev->rx_urb_size = dev->hard_mtu; | |
1da177e4 | 1237 | dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); |
cb1cebbe | 1238 | |
1da177e4 LT |
1239 | SET_NETDEV_DEV(net, &udev->dev); |
1240 | status = register_netdev (net); | |
1241 | if (status) | |
1242 | goto out3; | |
1243 | if (netif_msg_probe (dev)) | |
e174961c | 1244 | devinfo (dev, "register '%s' at usb-%s-%s, %s, %pM", |
38bde1d4 | 1245 | udev->dev.driver->name, |
1da177e4 LT |
1246 | xdev->bus->bus_name, xdev->devpath, |
1247 | dev->driver_info->description, | |
e174961c | 1248 | net->dev_addr); |
1da177e4 LT |
1249 | |
1250 | // ok, it's ready to go. | |
1251 | usb_set_intfdata (udev, dev); | |
1252 | ||
1253 | // start as if the link is up | |
1254 | netif_device_attach (net); | |
1255 | ||
1256 | return 0; | |
1257 | ||
1258 | out3: | |
1259 | if (info->unbind) | |
1260 | info->unbind (dev, udev); | |
1261 | out1: | |
1262 | free_netdev(net); | |
1263 | out: | |
1264 | usb_put_dev(xdev); | |
1265 | return status; | |
1266 | } | |
38bde1d4 | 1267 | EXPORT_SYMBOL_GPL(usbnet_probe); |
1da177e4 LT |
1268 | |
1269 | /*-------------------------------------------------------------------------*/ | |
1270 | ||
36433127 ON |
1271 | /* |
1272 | * suspend the whole driver as soon as the first interface is suspended | |
1273 | * resume only when the last interface is resumed | |
38bde1d4 | 1274 | */ |
1da177e4 | 1275 | |
38bde1d4 | 1276 | int usbnet_suspend (struct usb_interface *intf, pm_message_t message) |
1da177e4 LT |
1277 | { |
1278 | struct usbnet *dev = usb_get_intfdata(intf); | |
cb1cebbe | 1279 | |
36433127 | 1280 | if (!dev->suspend_count++) { |
a11a6544 ON |
1281 | /* |
1282 | * accelerate emptying of the rx and queues, to avoid | |
36433127 ON |
1283 | * having everything error out. |
1284 | */ | |
1285 | netif_device_detach (dev->net); | |
1286 | (void) unlink_urbs (dev, &dev->rxq); | |
1287 | (void) unlink_urbs (dev, &dev->txq); | |
a11a6544 ON |
1288 | /* |
1289 | * reattach so runtime management can use and | |
1290 | * wake the device | |
1291 | */ | |
1292 | netif_device_attach (dev->net); | |
36433127 | 1293 | } |
1da177e4 LT |
1294 | return 0; |
1295 | } | |
38bde1d4 | 1296 | EXPORT_SYMBOL_GPL(usbnet_suspend); |
1da177e4 | 1297 | |
38bde1d4 | 1298 | int usbnet_resume (struct usb_interface *intf) |
1da177e4 LT |
1299 | { |
1300 | struct usbnet *dev = usb_get_intfdata(intf); | |
1301 | ||
a11a6544 | 1302 | if (!--dev->suspend_count) |
36433127 | 1303 | tasklet_schedule (&dev->bh); |
a11a6544 | 1304 | |
1da177e4 LT |
1305 | return 0; |
1306 | } | |
38bde1d4 | 1307 | EXPORT_SYMBOL_GPL(usbnet_resume); |
1da177e4 | 1308 | |
1da177e4 | 1309 | |
1da177e4 LT |
1310 | /*-------------------------------------------------------------------------*/ |
1311 | ||
f29fc259 | 1312 | static int __init usbnet_init(void) |
1da177e4 | 1313 | { |
090ffa9d | 1314 | /* compiler should optimize this out */ |
f8ac232a | 1315 | BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) |
1da177e4 | 1316 | < sizeof (struct skb_data)); |
1da177e4 LT |
1317 | |
1318 | random_ether_addr(node_id); | |
cb1cebbe | 1319 | return 0; |
1da177e4 | 1320 | } |
f29fc259 | 1321 | module_init(usbnet_init); |
1da177e4 | 1322 | |
f29fc259 | 1323 | static void __exit usbnet_exit(void) |
1da177e4 | 1324 | { |
1da177e4 | 1325 | } |
f29fc259 | 1326 | module_exit(usbnet_exit); |
1da177e4 | 1327 | |
f29fc259 | 1328 | MODULE_AUTHOR("David Brownell"); |
090ffa9d | 1329 | MODULE_DESCRIPTION("USB network driver framework"); |
f29fc259 | 1330 | MODULE_LICENSE("GPL"); |