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Commit | Line | Data |
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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> | |
03ad032b | 40 | #include <linux/ctype.h> |
1da177e4 LT |
41 | #include <linux/ethtool.h> |
42 | #include <linux/workqueue.h> | |
43 | #include <linux/mii.h> | |
1da177e4 | 44 | #include <linux/usb.h> |
3692e94f | 45 | #include <linux/usb/usbnet.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
fd1f170d | 47 | #include <linux/kernel.h> |
b0786b43 | 48 | #include <linux/pm_runtime.h> |
f29fc259 DB |
49 | |
50 | #define DRIVER_VERSION "22-Aug-2005" | |
1da177e4 LT |
51 | |
52 | ||
53 | /*-------------------------------------------------------------------------*/ | |
54 | ||
55 | /* | |
56 | * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. | |
57 | * Several dozen bytes of IPv4 data can fit in two such transactions. | |
58 | * One maximum size Ethernet packet takes twenty four of them. | |
59 | * For high speed, each frame comfortably fits almost 36 max size | |
60 | * Ethernet packets (so queues should be bigger). | |
f29fc259 DB |
61 | * |
62 | * REVISIT qlens should be members of 'struct usbnet'; the goal is to | |
63 | * let the USB host controller be busy for 5msec or more before an irq | |
64 | * is required, under load. Jumbograms change the equation. | |
1da177e4 | 65 | */ |
a99c1949 JP |
66 | #define RX_MAX_QUEUE_MEMORY (60 * 1518) |
67 | #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ | |
68 | (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4) | |
69 | #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ | |
70 | (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4) | |
1da177e4 | 71 | |
1da177e4 LT |
72 | // reawaken network queue this soon after stopping; else watchdog barks |
73 | #define TX_TIMEOUT_JIFFIES (5*HZ) | |
74 | ||
75 | // throttle rx/tx briefly after some faults, so khubd might disconnect() | |
76 | // us (it polls at HZ/4 usually) before we report too many false errors. | |
77 | #define THROTTLE_JIFFIES (HZ/8) | |
78 | ||
1da177e4 LT |
79 | // between wakeups |
80 | #define UNLINK_TIMEOUT_MS 3 | |
81 | ||
82 | /*-------------------------------------------------------------------------*/ | |
83 | ||
84 | // randomly generated ethernet address | |
85 | static u8 node_id [ETH_ALEN]; | |
86 | ||
1da177e4 LT |
87 | static const char driver_name [] = "usbnet"; |
88 | ||
89 | /* use ethtool to change the level for any given device */ | |
90 | static int msg_level = -1; | |
91 | module_param (msg_level, int, 0); | |
92 | MODULE_PARM_DESC (msg_level, "Override default message level"); | |
93 | ||
1da177e4 LT |
94 | /*-------------------------------------------------------------------------*/ |
95 | ||
1da177e4 | 96 | /* handles CDC Ethernet and many other network "bulk data" interfaces */ |
2e55cc72 | 97 | int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) |
1da177e4 LT |
98 | { |
99 | int tmp; | |
100 | struct usb_host_interface *alt = NULL; | |
101 | struct usb_host_endpoint *in = NULL, *out = NULL; | |
102 | struct usb_host_endpoint *status = NULL; | |
103 | ||
104 | for (tmp = 0; tmp < intf->num_altsetting; tmp++) { | |
105 | unsigned ep; | |
106 | ||
107 | in = out = status = NULL; | |
108 | alt = intf->altsetting + tmp; | |
109 | ||
110 | /* take the first altsetting with in-bulk + out-bulk; | |
111 | * remember any status endpoint, just in case; | |
112 | * ignore other endpoints and altsetttings. | |
113 | */ | |
114 | for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { | |
115 | struct usb_host_endpoint *e; | |
116 | int intr = 0; | |
117 | ||
118 | e = alt->endpoint + ep; | |
119 | switch (e->desc.bmAttributes) { | |
120 | case USB_ENDPOINT_XFER_INT: | |
fc6e2544 | 121 | if (!usb_endpoint_dir_in(&e->desc)) |
1da177e4 LT |
122 | continue; |
123 | intr = 1; | |
124 | /* FALLTHROUGH */ | |
125 | case USB_ENDPOINT_XFER_BULK: | |
126 | break; | |
127 | default: | |
128 | continue; | |
129 | } | |
fc6e2544 | 130 | if (usb_endpoint_dir_in(&e->desc)) { |
1da177e4 LT |
131 | if (!intr && !in) |
132 | in = e; | |
133 | else if (intr && !status) | |
134 | status = e; | |
135 | } else { | |
136 | if (!out) | |
137 | out = e; | |
138 | } | |
139 | } | |
140 | if (in && out) | |
141 | break; | |
142 | } | |
143 | if (!alt || !in || !out) | |
144 | return -EINVAL; | |
145 | ||
8e95a202 JP |
146 | if (alt->desc.bAlternateSetting != 0 || |
147 | !(dev->driver_info->flags & FLAG_NO_SETINT)) { | |
1da177e4 LT |
148 | tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, |
149 | alt->desc.bAlternateSetting); | |
150 | if (tmp < 0) | |
151 | return tmp; | |
152 | } | |
cb1cebbe | 153 | |
1da177e4 LT |
154 | dev->in = usb_rcvbulkpipe (dev->udev, |
155 | in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
156 | dev->out = usb_sndbulkpipe (dev->udev, | |
157 | out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
158 | dev->status = status; | |
159 | return 0; | |
160 | } | |
2e55cc72 | 161 | EXPORT_SYMBOL_GPL(usbnet_get_endpoints); |
1da177e4 | 162 | |
03ad032b PH |
163 | int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) |
164 | { | |
165 | int tmp, i; | |
166 | unsigned char buf [13]; | |
167 | ||
168 | tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); | |
169 | if (tmp != 12) { | |
170 | dev_dbg(&dev->udev->dev, | |
171 | "bad MAC string %d fetch, %d\n", iMACAddress, tmp); | |
172 | if (tmp >= 0) | |
173 | tmp = -EINVAL; | |
174 | return tmp; | |
175 | } | |
176 | for (i = tmp = 0; i < 6; i++, tmp += 2) | |
177 | dev->net->dev_addr [i] = | |
fd1f170d | 178 | (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]); |
03ad032b PH |
179 | return 0; |
180 | } | |
181 | EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); | |
182 | ||
7d12e780 | 183 | static void intr_complete (struct urb *urb); |
1da177e4 LT |
184 | |
185 | static int init_status (struct usbnet *dev, struct usb_interface *intf) | |
186 | { | |
187 | char *buf = NULL; | |
188 | unsigned pipe = 0; | |
189 | unsigned maxp; | |
190 | unsigned period; | |
191 | ||
192 | if (!dev->driver_info->status) | |
193 | return 0; | |
194 | ||
195 | pipe = usb_rcvintpipe (dev->udev, | |
196 | dev->status->desc.bEndpointAddress | |
197 | & USB_ENDPOINT_NUMBER_MASK); | |
198 | maxp = usb_maxpacket (dev->udev, pipe, 0); | |
199 | ||
200 | /* avoid 1 msec chatter: min 8 msec poll rate */ | |
201 | period = max ((int) dev->status->desc.bInterval, | |
202 | (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); | |
203 | ||
e94b1766 | 204 | buf = kmalloc (maxp, GFP_KERNEL); |
1da177e4 | 205 | if (buf) { |
e94b1766 | 206 | dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); |
1da177e4 LT |
207 | if (!dev->interrupt) { |
208 | kfree (buf); | |
209 | return -ENOMEM; | |
210 | } else { | |
211 | usb_fill_int_urb(dev->interrupt, dev->udev, pipe, | |
212 | buf, maxp, intr_complete, dev, period); | |
213 | dev_dbg(&intf->dev, | |
214 | "status ep%din, %d bytes period %d\n", | |
215 | usb_pipeendpoint(pipe), maxp, period); | |
216 | } | |
217 | } | |
18ab458f | 218 | return 0; |
1da177e4 LT |
219 | } |
220 | ||
2e55cc72 DB |
221 | /* Passes this packet up the stack, updating its accounting. |
222 | * Some link protocols batch packets, so their rx_fixup paths | |
223 | * can return clones as well as just modify the original skb. | |
224 | */ | |
225 | void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) | |
1da177e4 LT |
226 | { |
227 | int status; | |
228 | ||
7834ddbc JK |
229 | if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { |
230 | skb_queue_tail(&dev->rxq_pause, skb); | |
231 | return; | |
232 | } | |
233 | ||
1da177e4 | 234 | skb->protocol = eth_type_trans (skb, dev->net); |
7963837f HX |
235 | dev->net->stats.rx_packets++; |
236 | dev->net->stats.rx_bytes += skb->len; | |
1da177e4 | 237 | |
a475f603 JP |
238 | netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", |
239 | skb->len + sizeof (struct ethhdr), skb->protocol); | |
1da177e4 LT |
240 | memset (skb->cb, 0, sizeof (struct skb_data)); |
241 | status = netif_rx (skb); | |
a475f603 JP |
242 | if (status != NET_RX_SUCCESS) |
243 | netif_dbg(dev, rx_err, dev->net, | |
244 | "netif_rx status %d\n", status); | |
1da177e4 | 245 | } |
2e55cc72 | 246 | EXPORT_SYMBOL_GPL(usbnet_skb_return); |
1da177e4 | 247 | |
1da177e4 LT |
248 | \f |
249 | /*------------------------------------------------------------------------- | |
250 | * | |
251 | * Network Device Driver (peer link to "Host Device", from USB host) | |
252 | * | |
253 | *-------------------------------------------------------------------------*/ | |
254 | ||
777baa47 | 255 | int usbnet_change_mtu (struct net_device *net, int new_mtu) |
1da177e4 LT |
256 | { |
257 | struct usbnet *dev = netdev_priv(net); | |
f29fc259 | 258 | int ll_mtu = new_mtu + net->hard_header_len; |
a99c1949 JP |
259 | int old_hard_mtu = dev->hard_mtu; |
260 | int old_rx_urb_size = dev->rx_urb_size; | |
1da177e4 | 261 | |
a99c1949 | 262 | if (new_mtu <= 0) |
1da177e4 | 263 | return -EINVAL; |
1da177e4 | 264 | // no second zero-length packet read wanted after mtu-sized packets |
f29fc259 | 265 | if ((ll_mtu % dev->maxpacket) == 0) |
1da177e4 LT |
266 | return -EDOM; |
267 | net->mtu = new_mtu; | |
a99c1949 JP |
268 | |
269 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
270 | if (dev->rx_urb_size == old_hard_mtu) { | |
271 | dev->rx_urb_size = dev->hard_mtu; | |
272 | if (dev->rx_urb_size > old_rx_urb_size) | |
273 | usbnet_unlink_rx_urbs(dev); | |
274 | } | |
275 | ||
1da177e4 LT |
276 | return 0; |
277 | } | |
777baa47 | 278 | EXPORT_SYMBOL_GPL(usbnet_change_mtu); |
1da177e4 LT |
279 | |
280 | /*-------------------------------------------------------------------------*/ | |
281 | ||
1da177e4 LT |
282 | /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from |
283 | * completion callbacks. 2.5 should have fixed those bugs... | |
284 | */ | |
285 | ||
8728b834 | 286 | static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) |
1da177e4 | 287 | { |
1da177e4 LT |
288 | unsigned long flags; |
289 | ||
8728b834 DM |
290 | spin_lock_irqsave(&list->lock, flags); |
291 | __skb_unlink(skb, list); | |
292 | spin_unlock(&list->lock); | |
293 | spin_lock(&dev->done.lock); | |
294 | __skb_queue_tail(&dev->done, skb); | |
1da177e4 | 295 | if (dev->done.qlen == 1) |
8728b834 DM |
296 | tasklet_schedule(&dev->bh); |
297 | spin_unlock_irqrestore(&dev->done.lock, flags); | |
1da177e4 LT |
298 | } |
299 | ||
300 | /* some work can't be done in tasklets, so we use keventd | |
301 | * | |
302 | * NOTE: annoying asymmetry: if it's active, schedule_work() fails, | |
303 | * but tasklet_schedule() doesn't. hope the failure is rare. | |
304 | */ | |
2e55cc72 | 305 | void usbnet_defer_kevent (struct usbnet *dev, int work) |
1da177e4 LT |
306 | { |
307 | set_bit (work, &dev->flags); | |
308 | if (!schedule_work (&dev->kevent)) | |
60b86755 | 309 | netdev_err(dev->net, "kevent %d may have been dropped\n", work); |
1da177e4 | 310 | else |
60b86755 | 311 | netdev_dbg(dev->net, "kevent %d scheduled\n", work); |
1da177e4 | 312 | } |
2e55cc72 | 313 | EXPORT_SYMBOL_GPL(usbnet_defer_kevent); |
1da177e4 LT |
314 | |
315 | /*-------------------------------------------------------------------------*/ | |
316 | ||
7d12e780 | 317 | static void rx_complete (struct urb *urb); |
1da177e4 | 318 | |
dacb3975 | 319 | static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) |
1da177e4 LT |
320 | { |
321 | struct sk_buff *skb; | |
322 | struct skb_data *entry; | |
323 | int retval = 0; | |
324 | unsigned long lockflags; | |
2e55cc72 | 325 | size_t size = dev->rx_urb_size; |
1da177e4 | 326 | |
1da177e4 | 327 | if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) { |
a475f603 | 328 | netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); |
2e55cc72 | 329 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
1da177e4 | 330 | usb_free_urb (urb); |
dacb3975 | 331 | return -ENOMEM; |
1da177e4 LT |
332 | } |
333 | skb_reserve (skb, NET_IP_ALIGN); | |
334 | ||
335 | entry = (struct skb_data *) skb->cb; | |
336 | entry->urb = urb; | |
337 | entry->dev = dev; | |
338 | entry->state = rx_start; | |
339 | entry->length = 0; | |
340 | ||
341 | usb_fill_bulk_urb (urb, dev->udev, dev->in, | |
342 | skb->data, size, rx_complete, skb); | |
1da177e4 LT |
343 | |
344 | spin_lock_irqsave (&dev->rxq.lock, lockflags); | |
345 | ||
8e95a202 JP |
346 | if (netif_running (dev->net) && |
347 | netif_device_present (dev->net) && | |
69ee472f ON |
348 | !test_bit (EVENT_RX_HALT, &dev->flags) && |
349 | !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { | |
18ab458f | 350 | switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { |
1da177e4 | 351 | case -EPIPE: |
2e55cc72 | 352 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
1da177e4 LT |
353 | break; |
354 | case -ENOMEM: | |
2e55cc72 | 355 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
1da177e4 LT |
356 | break; |
357 | case -ENODEV: | |
a475f603 | 358 | netif_dbg(dev, ifdown, dev->net, "device gone\n"); |
1da177e4 LT |
359 | netif_device_detach (dev->net); |
360 | break; | |
dacb3975 DM |
361 | case -EHOSTUNREACH: |
362 | retval = -ENOLINK; | |
363 | break; | |
1da177e4 | 364 | default: |
a475f603 JP |
365 | netif_dbg(dev, rx_err, dev->net, |
366 | "rx submit, %d\n", retval); | |
1da177e4 LT |
367 | tasklet_schedule (&dev->bh); |
368 | break; | |
369 | case 0: | |
370 | __skb_queue_tail (&dev->rxq, skb); | |
371 | } | |
372 | } else { | |
a475f603 | 373 | netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); |
1da177e4 LT |
374 | retval = -ENOLINK; |
375 | } | |
376 | spin_unlock_irqrestore (&dev->rxq.lock, lockflags); | |
377 | if (retval) { | |
378 | dev_kfree_skb_any (skb); | |
379 | usb_free_urb (urb); | |
380 | } | |
dacb3975 | 381 | return retval; |
1da177e4 LT |
382 | } |
383 | ||
384 | ||
385 | /*-------------------------------------------------------------------------*/ | |
386 | ||
387 | static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) | |
388 | { | |
8e95a202 | 389 | if (dev->driver_info->rx_fixup && |
7a635ea9 AZ |
390 | !dev->driver_info->rx_fixup (dev, skb)) { |
391 | /* With RX_ASSEMBLE, rx_fixup() must update counters */ | |
392 | if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) | |
393 | dev->net->stats.rx_errors++; | |
394 | goto done; | |
395 | } | |
1da177e4 LT |
396 | // else network stack removes extra byte if we forced a short packet |
397 | ||
073285fd AO |
398 | if (skb->len) { |
399 | /* all data was already cloned from skb inside the driver */ | |
400 | if (dev->driver_info->flags & FLAG_MULTI_PACKET) | |
401 | dev_kfree_skb_any(skb); | |
402 | else | |
403 | usbnet_skb_return(dev, skb); | |
404 | return; | |
1da177e4 | 405 | } |
073285fd AO |
406 | |
407 | netif_dbg(dev, rx_err, dev->net, "drop\n"); | |
073285fd | 408 | dev->net->stats.rx_errors++; |
7a635ea9 | 409 | done: |
073285fd | 410 | skb_queue_tail(&dev->done, skb); |
1da177e4 LT |
411 | } |
412 | ||
413 | /*-------------------------------------------------------------------------*/ | |
414 | ||
7d12e780 | 415 | static void rx_complete (struct urb *urb) |
1da177e4 LT |
416 | { |
417 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
418 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
419 | struct usbnet *dev = entry->dev; | |
420 | int urb_status = urb->status; | |
421 | ||
422 | skb_put (skb, urb->actual_length); | |
423 | entry->state = rx_done; | |
424 | entry->urb = NULL; | |
425 | ||
426 | switch (urb_status) { | |
18ab458f DB |
427 | /* success */ |
428 | case 0: | |
f29fc259 | 429 | if (skb->len < dev->net->hard_header_len) { |
1da177e4 | 430 | entry->state = rx_cleanup; |
7963837f HX |
431 | dev->net->stats.rx_errors++; |
432 | dev->net->stats.rx_length_errors++; | |
a475f603 JP |
433 | netif_dbg(dev, rx_err, dev->net, |
434 | "rx length %d\n", skb->len); | |
1da177e4 LT |
435 | } |
436 | break; | |
437 | ||
18ab458f DB |
438 | /* stalls need manual reset. this is rare ... except that |
439 | * when going through USB 2.0 TTs, unplug appears this way. | |
3ac49a1c | 440 | * we avoid the highspeed version of the ETIMEDOUT/EILSEQ |
18ab458f DB |
441 | * storm, recovering as needed. |
442 | */ | |
443 | case -EPIPE: | |
7963837f | 444 | dev->net->stats.rx_errors++; |
2e55cc72 | 445 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
1da177e4 LT |
446 | // FALLTHROUGH |
447 | ||
18ab458f DB |
448 | /* software-driven interface shutdown */ |
449 | case -ECONNRESET: /* async unlink */ | |
450 | case -ESHUTDOWN: /* hardware gone */ | |
a475f603 JP |
451 | netif_dbg(dev, ifdown, dev->net, |
452 | "rx shutdown, code %d\n", urb_status); | |
1da177e4 LT |
453 | goto block; |
454 | ||
18ab458f DB |
455 | /* we get controller i/o faults during khubd disconnect() delays. |
456 | * throttle down resubmits, to avoid log floods; just temporarily, | |
457 | * so we still recover when the fault isn't a khubd delay. | |
458 | */ | |
459 | case -EPROTO: | |
460 | case -ETIME: | |
461 | case -EILSEQ: | |
7963837f | 462 | dev->net->stats.rx_errors++; |
1da177e4 LT |
463 | if (!timer_pending (&dev->delay)) { |
464 | mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); | |
a475f603 JP |
465 | netif_dbg(dev, link, dev->net, |
466 | "rx throttle %d\n", urb_status); | |
1da177e4 LT |
467 | } |
468 | block: | |
469 | entry->state = rx_cleanup; | |
470 | entry->urb = urb; | |
471 | urb = NULL; | |
472 | break; | |
473 | ||
18ab458f DB |
474 | /* data overrun ... flush fifo? */ |
475 | case -EOVERFLOW: | |
7963837f | 476 | dev->net->stats.rx_over_errors++; |
1da177e4 | 477 | // FALLTHROUGH |
cb1cebbe | 478 | |
18ab458f | 479 | default: |
1da177e4 | 480 | entry->state = rx_cleanup; |
7963837f | 481 | dev->net->stats.rx_errors++; |
a475f603 | 482 | netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); |
1da177e4 LT |
483 | break; |
484 | } | |
485 | ||
8728b834 | 486 | defer_bh(dev, skb, &dev->rxq); |
1da177e4 LT |
487 | |
488 | if (urb) { | |
8e95a202 JP |
489 | if (netif_running (dev->net) && |
490 | !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
1da177e4 LT |
491 | rx_submit (dev, urb, GFP_ATOMIC); |
492 | return; | |
493 | } | |
494 | usb_free_urb (urb); | |
495 | } | |
a475f603 | 496 | netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); |
1da177e4 LT |
497 | } |
498 | ||
7d12e780 | 499 | static void intr_complete (struct urb *urb) |
1da177e4 LT |
500 | { |
501 | struct usbnet *dev = urb->context; | |
502 | int status = urb->status; | |
503 | ||
504 | switch (status) { | |
18ab458f DB |
505 | /* success */ |
506 | case 0: | |
1da177e4 LT |
507 | dev->driver_info->status(dev, urb); |
508 | break; | |
509 | ||
18ab458f DB |
510 | /* software-driven interface shutdown */ |
511 | case -ENOENT: /* urb killed */ | |
512 | case -ESHUTDOWN: /* hardware gone */ | |
a475f603 JP |
513 | netif_dbg(dev, ifdown, dev->net, |
514 | "intr shutdown, code %d\n", status); | |
1da177e4 LT |
515 | return; |
516 | ||
18ab458f DB |
517 | /* NOTE: not throttling like RX/TX, since this endpoint |
518 | * already polls infrequently | |
519 | */ | |
520 | default: | |
60b86755 | 521 | netdev_dbg(dev->net, "intr status %d\n", status); |
1da177e4 LT |
522 | break; |
523 | } | |
524 | ||
525 | if (!netif_running (dev->net)) | |
526 | return; | |
527 | ||
528 | memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); | |
529 | status = usb_submit_urb (urb, GFP_ATOMIC); | |
a475f603 JP |
530 | if (status != 0) |
531 | netif_err(dev, timer, dev->net, | |
532 | "intr resubmit --> %d\n", status); | |
1da177e4 LT |
533 | } |
534 | ||
7834ddbc JK |
535 | /*-------------------------------------------------------------------------*/ |
536 | void usbnet_pause_rx(struct usbnet *dev) | |
537 | { | |
538 | set_bit(EVENT_RX_PAUSED, &dev->flags); | |
539 | ||
a475f603 | 540 | netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); |
7834ddbc JK |
541 | } |
542 | EXPORT_SYMBOL_GPL(usbnet_pause_rx); | |
543 | ||
544 | void usbnet_resume_rx(struct usbnet *dev) | |
545 | { | |
546 | struct sk_buff *skb; | |
547 | int num = 0; | |
548 | ||
549 | clear_bit(EVENT_RX_PAUSED, &dev->flags); | |
550 | ||
551 | while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { | |
552 | usbnet_skb_return(dev, skb); | |
553 | num++; | |
554 | } | |
555 | ||
556 | tasklet_schedule(&dev->bh); | |
557 | ||
a475f603 JP |
558 | netif_dbg(dev, rx_status, dev->net, |
559 | "paused rx queue disabled, %d skbs requeued\n", num); | |
7834ddbc JK |
560 | } |
561 | EXPORT_SYMBOL_GPL(usbnet_resume_rx); | |
562 | ||
563 | void usbnet_purge_paused_rxq(struct usbnet *dev) | |
564 | { | |
565 | skb_queue_purge(&dev->rxq_pause); | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); | |
568 | ||
1da177e4 LT |
569 | /*-------------------------------------------------------------------------*/ |
570 | ||
571 | // unlink pending rx/tx; completion handlers do all other cleanup | |
572 | ||
573 | static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) | |
574 | { | |
575 | unsigned long flags; | |
576 | struct sk_buff *skb, *skbnext; | |
577 | int count = 0; | |
578 | ||
579 | spin_lock_irqsave (&q->lock, flags); | |
83bfba5f | 580 | skb_queue_walk_safe(q, skb, skbnext) { |
1da177e4 LT |
581 | struct skb_data *entry; |
582 | struct urb *urb; | |
583 | int retval; | |
584 | ||
585 | entry = (struct skb_data *) skb->cb; | |
586 | urb = entry->urb; | |
1da177e4 LT |
587 | |
588 | // during some PM-driven resume scenarios, | |
589 | // these (async) unlinks complete immediately | |
590 | retval = usb_unlink_urb (urb); | |
591 | if (retval != -EINPROGRESS && retval != 0) | |
60b86755 | 592 | netdev_dbg(dev->net, "unlink urb err, %d\n", retval); |
1da177e4 LT |
593 | else |
594 | count++; | |
595 | } | |
596 | spin_unlock_irqrestore (&q->lock, flags); | |
597 | return count; | |
598 | } | |
599 | ||
a99c1949 JP |
600 | // Flush all pending rx urbs |
601 | // minidrivers may need to do this when the MTU changes | |
602 | ||
603 | void usbnet_unlink_rx_urbs(struct usbnet *dev) | |
604 | { | |
605 | if (netif_running(dev->net)) { | |
606 | (void) unlink_urbs (dev, &dev->rxq); | |
607 | tasklet_schedule(&dev->bh); | |
608 | } | |
609 | } | |
610 | EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); | |
1da177e4 LT |
611 | |
612 | /*-------------------------------------------------------------------------*/ | |
613 | ||
614 | // precondition: never called in_interrupt | |
69ee472f ON |
615 | static void usbnet_terminate_urbs(struct usbnet *dev) |
616 | { | |
617 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); | |
618 | DECLARE_WAITQUEUE(wait, current); | |
619 | int temp; | |
620 | ||
621 | /* ensure there are no more active urbs */ | |
622 | add_wait_queue(&unlink_wakeup, &wait); | |
623 | set_current_state(TASK_UNINTERRUPTIBLE); | |
624 | dev->wait = &unlink_wakeup; | |
625 | temp = unlink_urbs(dev, &dev->txq) + | |
626 | unlink_urbs(dev, &dev->rxq); | |
627 | ||
628 | /* maybe wait for deletions to finish. */ | |
629 | while (!skb_queue_empty(&dev->rxq) | |
630 | && !skb_queue_empty(&dev->txq) | |
631 | && !skb_queue_empty(&dev->done)) { | |
66cc42a4 | 632 | schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); |
69ee472f | 633 | set_current_state(TASK_UNINTERRUPTIBLE); |
a475f603 JP |
634 | netif_dbg(dev, ifdown, dev->net, |
635 | "waited for %d urb completions\n", temp); | |
69ee472f ON |
636 | } |
637 | set_current_state(TASK_RUNNING); | |
638 | dev->wait = NULL; | |
639 | remove_wait_queue(&unlink_wakeup, &wait); | |
640 | } | |
1da177e4 | 641 | |
777baa47 | 642 | int usbnet_stop (struct net_device *net) |
1da177e4 LT |
643 | { |
644 | struct usbnet *dev = netdev_priv(net); | |
a33e9e7f | 645 | struct driver_info *info = dev->driver_info; |
a33e9e7f | 646 | int retval; |
1da177e4 LT |
647 | |
648 | netif_stop_queue (net); | |
649 | ||
a475f603 | 650 | netif_info(dev, ifdown, dev->net, |
8ccef431 | 651 | "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", |
a475f603 JP |
652 | net->stats.rx_packets, net->stats.tx_packets, |
653 | net->stats.rx_errors, net->stats.tx_errors); | |
1da177e4 | 654 | |
a33e9e7f JK |
655 | /* allow minidriver to stop correctly (wireless devices to turn off |
656 | * radio etc) */ | |
657 | if (info->stop) { | |
658 | retval = info->stop(dev); | |
a475f603 JP |
659 | if (retval < 0) |
660 | netif_info(dev, ifdown, dev->net, | |
661 | "stop fail (%d) usbnet usb-%s-%s, %s\n", | |
662 | retval, | |
663 | dev->udev->bus->bus_name, dev->udev->devpath, | |
664 | info->description); | |
a33e9e7f JK |
665 | } |
666 | ||
69ee472f ON |
667 | if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) |
668 | usbnet_terminate_urbs(dev); | |
1da177e4 LT |
669 | |
670 | usb_kill_urb(dev->interrupt); | |
671 | ||
7834ddbc JK |
672 | usbnet_purge_paused_rxq(dev); |
673 | ||
1da177e4 LT |
674 | /* deferred work (task, timer, softirq) must also stop. |
675 | * can't flush_scheduled_work() until we drop rtnl (later), | |
676 | * else workers could deadlock; so make workers a NOP. | |
677 | */ | |
678 | dev->flags = 0; | |
679 | del_timer_sync (&dev->delay); | |
680 | tasklet_kill (&dev->bh); | |
69ee472f ON |
681 | if (info->manage_power) |
682 | info->manage_power(dev, 0); | |
683 | else | |
684 | usb_autopm_put_interface(dev->intf); | |
1da177e4 LT |
685 | |
686 | return 0; | |
687 | } | |
777baa47 | 688 | EXPORT_SYMBOL_GPL(usbnet_stop); |
1da177e4 LT |
689 | |
690 | /*-------------------------------------------------------------------------*/ | |
691 | ||
692 | // posts reads, and enables write queuing | |
693 | ||
694 | // precondition: never called in_interrupt | |
695 | ||
777baa47 | 696 | int usbnet_open (struct net_device *net) |
1da177e4 LT |
697 | { |
698 | struct usbnet *dev = netdev_priv(net); | |
a11a6544 | 699 | int retval; |
1da177e4 LT |
700 | struct driver_info *info = dev->driver_info; |
701 | ||
a11a6544 | 702 | if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { |
a475f603 JP |
703 | netif_info(dev, ifup, dev->net, |
704 | "resumption fail (%d) usbnet usb-%s-%s, %s\n", | |
705 | retval, | |
706 | dev->udev->bus->bus_name, | |
707 | dev->udev->devpath, | |
708 | info->description); | |
a11a6544 ON |
709 | goto done_nopm; |
710 | } | |
711 | ||
1da177e4 LT |
712 | // put into "known safe" state |
713 | if (info->reset && (retval = info->reset (dev)) < 0) { | |
a475f603 JP |
714 | netif_info(dev, ifup, dev->net, |
715 | "open reset fail (%d) usbnet usb-%s-%s, %s\n", | |
716 | retval, | |
717 | dev->udev->bus->bus_name, | |
718 | dev->udev->devpath, | |
719 | info->description); | |
1da177e4 LT |
720 | goto done; |
721 | } | |
722 | ||
723 | // insist peer be connected | |
724 | if (info->check_connect && (retval = info->check_connect (dev)) < 0) { | |
a475f603 | 725 | netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); |
1da177e4 LT |
726 | goto done; |
727 | } | |
728 | ||
729 | /* start any status interrupt transfer */ | |
730 | if (dev->interrupt) { | |
731 | retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); | |
732 | if (retval < 0) { | |
a475f603 JP |
733 | netif_err(dev, ifup, dev->net, |
734 | "intr submit %d\n", retval); | |
1da177e4 LT |
735 | goto done; |
736 | } | |
737 | } | |
738 | ||
739 | netif_start_queue (net); | |
a475f603 JP |
740 | netif_info(dev, ifup, dev->net, |
741 | "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", | |
742 | (int)RX_QLEN(dev), (int)TX_QLEN(dev), | |
743 | dev->net->mtu, | |
744 | (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : | |
745 | (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : | |
746 | (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : | |
747 | (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : | |
748 | (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : | |
749 | "simple"); | |
1da177e4 LT |
750 | |
751 | // delay posting reads until we're fully open | |
752 | tasklet_schedule (&dev->bh); | |
69ee472f ON |
753 | if (info->manage_power) { |
754 | retval = info->manage_power(dev, 1); | |
755 | if (retval < 0) | |
756 | goto done; | |
757 | usb_autopm_put_interface(dev->intf); | |
758 | } | |
a11a6544 | 759 | return retval; |
a475f603 | 760 | |
1da177e4 | 761 | done: |
a11a6544 ON |
762 | usb_autopm_put_interface(dev->intf); |
763 | done_nopm: | |
1da177e4 LT |
764 | return retval; |
765 | } | |
777baa47 | 766 | EXPORT_SYMBOL_GPL(usbnet_open); |
1da177e4 LT |
767 | |
768 | /*-------------------------------------------------------------------------*/ | |
769 | ||
2e55cc72 DB |
770 | /* ethtool methods; minidrivers may need to add some more, but |
771 | * they'll probably want to use this base set. | |
772 | */ | |
773 | ||
c41286fd AB |
774 | int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) |
775 | { | |
776 | struct usbnet *dev = netdev_priv(net); | |
777 | ||
778 | if (!dev->mii.mdio_read) | |
779 | return -EOPNOTSUPP; | |
780 | ||
781 | return mii_ethtool_gset(&dev->mii, cmd); | |
782 | } | |
783 | EXPORT_SYMBOL_GPL(usbnet_get_settings); | |
784 | ||
785 | int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) | |
786 | { | |
787 | struct usbnet *dev = netdev_priv(net); | |
788 | int retval; | |
789 | ||
790 | if (!dev->mii.mdio_write) | |
791 | return -EOPNOTSUPP; | |
792 | ||
793 | retval = mii_ethtool_sset(&dev->mii, cmd); | |
794 | ||
795 | /* link speed/duplex might have changed */ | |
796 | if (dev->driver_info->link_reset) | |
797 | dev->driver_info->link_reset(dev); | |
798 | ||
799 | return retval; | |
800 | ||
801 | } | |
802 | EXPORT_SYMBOL_GPL(usbnet_set_settings); | |
803 | ||
c41286fd | 804 | u32 usbnet_get_link (struct net_device *net) |
1da177e4 LT |
805 | { |
806 | struct usbnet *dev = netdev_priv(net); | |
807 | ||
f29fc259 | 808 | /* If a check_connect is defined, return its result */ |
1da177e4 LT |
809 | if (dev->driver_info->check_connect) |
810 | return dev->driver_info->check_connect (dev) == 0; | |
811 | ||
c41286fd AB |
812 | /* if the device has mii operations, use those */ |
813 | if (dev->mii.mdio_read) | |
814 | return mii_link_ok(&dev->mii); | |
815 | ||
05ffb3e2 BM |
816 | /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ |
817 | return ethtool_op_get_link(net); | |
1da177e4 | 818 | } |
c41286fd | 819 | EXPORT_SYMBOL_GPL(usbnet_get_link); |
1da177e4 | 820 | |
18ee91fa | 821 | int usbnet_nway_reset(struct net_device *net) |
1da177e4 LT |
822 | { |
823 | struct usbnet *dev = netdev_priv(net); | |
824 | ||
18ee91fa DB |
825 | if (!dev->mii.mdio_write) |
826 | return -EOPNOTSUPP; | |
827 | ||
828 | return mii_nway_restart(&dev->mii); | |
1da177e4 | 829 | } |
18ee91fa | 830 | EXPORT_SYMBOL_GPL(usbnet_nway_reset); |
1da177e4 | 831 | |
18ee91fa | 832 | void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) |
1da177e4 LT |
833 | { |
834 | struct usbnet *dev = netdev_priv(net); | |
835 | ||
296c0242 | 836 | strncpy (info->driver, dev->driver_name, sizeof info->driver); |
18ee91fa DB |
837 | strncpy (info->version, DRIVER_VERSION, sizeof info->version); |
838 | strncpy (info->fw_version, dev->driver_info->description, | |
839 | sizeof info->fw_version); | |
840 | usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); | |
1da177e4 | 841 | } |
18ee91fa | 842 | EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); |
1da177e4 | 843 | |
18ee91fa | 844 | u32 usbnet_get_msglevel (struct net_device *net) |
c41286fd AB |
845 | { |
846 | struct usbnet *dev = netdev_priv(net); | |
847 | ||
18ee91fa DB |
848 | return dev->msg_enable; |
849 | } | |
850 | EXPORT_SYMBOL_GPL(usbnet_get_msglevel); | |
c41286fd | 851 | |
18ee91fa DB |
852 | void usbnet_set_msglevel (struct net_device *net, u32 level) |
853 | { | |
854 | struct usbnet *dev = netdev_priv(net); | |
855 | ||
856 | dev->msg_enable = level; | |
c41286fd | 857 | } |
18ee91fa | 858 | EXPORT_SYMBOL_GPL(usbnet_set_msglevel); |
c41286fd | 859 | |
2e55cc72 | 860 | /* drivers may override default ethtool_ops in their bind() routine */ |
0fc0b732 | 861 | static const struct ethtool_ops usbnet_ethtool_ops = { |
c41286fd AB |
862 | .get_settings = usbnet_get_settings, |
863 | .set_settings = usbnet_set_settings, | |
2e55cc72 | 864 | .get_link = usbnet_get_link, |
c41286fd | 865 | .nway_reset = usbnet_nway_reset, |
18ee91fa | 866 | .get_drvinfo = usbnet_get_drvinfo, |
2e55cc72 DB |
867 | .get_msglevel = usbnet_get_msglevel, |
868 | .set_msglevel = usbnet_set_msglevel, | |
869 | }; | |
1da177e4 LT |
870 | |
871 | /*-------------------------------------------------------------------------*/ | |
872 | ||
873 | /* work that cannot be done in interrupt context uses keventd. | |
874 | * | |
875 | * NOTE: with 2.5 we could do more of this using completion callbacks, | |
876 | * especially now that control transfers can be queued. | |
877 | */ | |
878 | static void | |
c4028958 | 879 | kevent (struct work_struct *work) |
1da177e4 | 880 | { |
c4028958 DH |
881 | struct usbnet *dev = |
882 | container_of(work, struct usbnet, kevent); | |
1da177e4 LT |
883 | int status; |
884 | ||
885 | /* usb_clear_halt() needs a thread context */ | |
886 | if (test_bit (EVENT_TX_HALT, &dev->flags)) { | |
887 | unlink_urbs (dev, &dev->txq); | |
69ee472f ON |
888 | status = usb_autopm_get_interface(dev->intf); |
889 | if (status < 0) | |
890 | goto fail_pipe; | |
1da177e4 | 891 | status = usb_clear_halt (dev->udev, dev->out); |
69ee472f | 892 | usb_autopm_put_interface(dev->intf); |
8e95a202 JP |
893 | if (status < 0 && |
894 | status != -EPIPE && | |
895 | status != -ESHUTDOWN) { | |
1da177e4 | 896 | if (netif_msg_tx_err (dev)) |
69ee472f | 897 | fail_pipe: |
60b86755 JP |
898 | netdev_err(dev->net, "can't clear tx halt, status %d\n", |
899 | status); | |
1da177e4 LT |
900 | } else { |
901 | clear_bit (EVENT_TX_HALT, &dev->flags); | |
f29fc259 DB |
902 | if (status != -ESHUTDOWN) |
903 | netif_wake_queue (dev->net); | |
1da177e4 LT |
904 | } |
905 | } | |
906 | if (test_bit (EVENT_RX_HALT, &dev->flags)) { | |
907 | unlink_urbs (dev, &dev->rxq); | |
69ee472f ON |
908 | status = usb_autopm_get_interface(dev->intf); |
909 | if (status < 0) | |
910 | goto fail_halt; | |
1da177e4 | 911 | status = usb_clear_halt (dev->udev, dev->in); |
69ee472f | 912 | usb_autopm_put_interface(dev->intf); |
8e95a202 JP |
913 | if (status < 0 && |
914 | status != -EPIPE && | |
915 | status != -ESHUTDOWN) { | |
1da177e4 | 916 | if (netif_msg_rx_err (dev)) |
69ee472f | 917 | fail_halt: |
60b86755 JP |
918 | netdev_err(dev->net, "can't clear rx halt, status %d\n", |
919 | status); | |
1da177e4 LT |
920 | } else { |
921 | clear_bit (EVENT_RX_HALT, &dev->flags); | |
922 | tasklet_schedule (&dev->bh); | |
923 | } | |
924 | } | |
925 | ||
926 | /* tasklet could resubmit itself forever if memory is tight */ | |
927 | if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { | |
928 | struct urb *urb = NULL; | |
dacb3975 | 929 | int resched = 1; |
1da177e4 LT |
930 | |
931 | if (netif_running (dev->net)) | |
932 | urb = usb_alloc_urb (0, GFP_KERNEL); | |
933 | else | |
934 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
935 | if (urb != NULL) { | |
936 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
69ee472f | 937 | status = usb_autopm_get_interface(dev->intf); |
ab60707f JJ |
938 | if (status < 0) { |
939 | usb_free_urb(urb); | |
69ee472f | 940 | goto fail_lowmem; |
ab60707f | 941 | } |
dacb3975 DM |
942 | if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) |
943 | resched = 0; | |
69ee472f ON |
944 | usb_autopm_put_interface(dev->intf); |
945 | fail_lowmem: | |
dacb3975 DM |
946 | if (resched) |
947 | tasklet_schedule (&dev->bh); | |
1da177e4 LT |
948 | } |
949 | } | |
950 | ||
7ea13c9c | 951 | if (test_bit (EVENT_LINK_RESET, &dev->flags)) { |
cb1cebbe | 952 | struct driver_info *info = dev->driver_info; |
7ea13c9c DH |
953 | int retval = 0; |
954 | ||
955 | clear_bit (EVENT_LINK_RESET, &dev->flags); | |
69ee472f ON |
956 | status = usb_autopm_get_interface(dev->intf); |
957 | if (status < 0) | |
958 | goto skip_reset; | |
7ea13c9c | 959 | if(info->link_reset && (retval = info->link_reset(dev)) < 0) { |
69ee472f ON |
960 | usb_autopm_put_interface(dev->intf); |
961 | skip_reset: | |
60b86755 JP |
962 | netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", |
963 | retval, | |
964 | dev->udev->bus->bus_name, | |
965 | dev->udev->devpath, | |
966 | info->description); | |
69ee472f ON |
967 | } else { |
968 | usb_autopm_put_interface(dev->intf); | |
7ea13c9c DH |
969 | } |
970 | } | |
971 | ||
1da177e4 | 972 | if (dev->flags) |
60b86755 | 973 | netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); |
1da177e4 LT |
974 | } |
975 | ||
976 | /*-------------------------------------------------------------------------*/ | |
977 | ||
7d12e780 | 978 | static void tx_complete (struct urb *urb) |
1da177e4 LT |
979 | { |
980 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
981 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
982 | struct usbnet *dev = entry->dev; | |
983 | ||
984 | if (urb->status == 0) { | |
073285fd AO |
985 | if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) |
986 | dev->net->stats.tx_packets++; | |
7963837f | 987 | dev->net->stats.tx_bytes += entry->length; |
1da177e4 | 988 | } else { |
7963837f | 989 | dev->net->stats.tx_errors++; |
1da177e4 LT |
990 | |
991 | switch (urb->status) { | |
992 | case -EPIPE: | |
2e55cc72 | 993 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
1da177e4 LT |
994 | break; |
995 | ||
996 | /* software-driven interface shutdown */ | |
997 | case -ECONNRESET: // async unlink | |
998 | case -ESHUTDOWN: // hardware gone | |
999 | break; | |
1000 | ||
1001 | // like rx, tx gets controller i/o faults during khubd delays | |
1002 | // and so it uses the same throttling mechanism. | |
38e2bfc9 PZ |
1003 | case -EPROTO: |
1004 | case -ETIME: | |
1005 | case -EILSEQ: | |
69ee472f | 1006 | usb_mark_last_busy(dev->udev); |
1da177e4 LT |
1007 | if (!timer_pending (&dev->delay)) { |
1008 | mod_timer (&dev->delay, | |
1009 | jiffies + THROTTLE_JIFFIES); | |
a475f603 JP |
1010 | netif_dbg(dev, link, dev->net, |
1011 | "tx throttle %d\n", urb->status); | |
1da177e4 LT |
1012 | } |
1013 | netif_stop_queue (dev->net); | |
1014 | break; | |
1015 | default: | |
a475f603 JP |
1016 | netif_dbg(dev, tx_err, dev->net, |
1017 | "tx err %d\n", entry->urb->status); | |
1da177e4 LT |
1018 | break; |
1019 | } | |
1020 | } | |
1021 | ||
69ee472f | 1022 | usb_autopm_put_interface_async(dev->intf); |
1da177e4 LT |
1023 | urb->dev = NULL; |
1024 | entry->state = tx_done; | |
8728b834 | 1025 | defer_bh(dev, skb, &dev->txq); |
1da177e4 LT |
1026 | } |
1027 | ||
1028 | /*-------------------------------------------------------------------------*/ | |
1029 | ||
777baa47 | 1030 | void usbnet_tx_timeout (struct net_device *net) |
1da177e4 LT |
1031 | { |
1032 | struct usbnet *dev = netdev_priv(net); | |
1033 | ||
1034 | unlink_urbs (dev, &dev->txq); | |
1035 | tasklet_schedule (&dev->bh); | |
1036 | ||
1037 | // FIXME: device recovery -- reset? | |
1038 | } | |
777baa47 | 1039 | EXPORT_SYMBOL_GPL(usbnet_tx_timeout); |
1da177e4 LT |
1040 | |
1041 | /*-------------------------------------------------------------------------*/ | |
1042 | ||
25a79c41 SH |
1043 | netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, |
1044 | struct net_device *net) | |
1da177e4 LT |
1045 | { |
1046 | struct usbnet *dev = netdev_priv(net); | |
1047 | int length; | |
1da177e4 LT |
1048 | struct urb *urb = NULL; |
1049 | struct skb_data *entry; | |
1050 | struct driver_info *info = dev->driver_info; | |
1051 | unsigned long flags; | |
25a79c41 | 1052 | int retval; |
1da177e4 LT |
1053 | |
1054 | // some devices want funky USB-level framing, for | |
1055 | // win32 driver (usually) and/or hardware quirks | |
1056 | if (info->tx_fixup) { | |
1057 | skb = info->tx_fixup (dev, skb, GFP_ATOMIC); | |
1058 | if (!skb) { | |
073285fd AO |
1059 | if (netif_msg_tx_err(dev)) { |
1060 | netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); | |
1061 | goto drop; | |
1062 | } else { | |
1063 | /* cdc_ncm collected packet; waits for more */ | |
1064 | goto not_drop; | |
1065 | } | |
1da177e4 LT |
1066 | } |
1067 | } | |
1068 | length = skb->len; | |
1069 | ||
1070 | if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { | |
a475f603 | 1071 | netif_dbg(dev, tx_err, dev->net, "no urb\n"); |
1da177e4 LT |
1072 | goto drop; |
1073 | } | |
1074 | ||
1075 | entry = (struct skb_data *) skb->cb; | |
1076 | entry->urb = urb; | |
1077 | entry->dev = dev; | |
1078 | entry->state = tx_start; | |
1079 | entry->length = length; | |
1080 | ||
1da177e4 LT |
1081 | usb_fill_bulk_urb (urb, dev->udev, dev->out, |
1082 | skb->data, skb->len, tx_complete, skb); | |
1da177e4 LT |
1083 | |
1084 | /* don't assume the hardware handles USB_ZERO_PACKET | |
1085 | * NOTE: strictly conforming cdc-ether devices should expect | |
1086 | * the ZLP here, but ignore the one-byte packet. | |
073285fd AO |
1087 | * NOTE2: CDC NCM specification is different from CDC ECM when |
1088 | * handling ZLP/short packets, so cdc_ncm driver will make short | |
1089 | * packet itself if needed. | |
1da177e4 | 1090 | */ |
b4d562e3 EP |
1091 | if (length % dev->maxpacket == 0) { |
1092 | if (!(info->flags & FLAG_SEND_ZLP)) { | |
073285fd AO |
1093 | if (!(info->flags & FLAG_MULTI_PACKET)) { |
1094 | urb->transfer_buffer_length++; | |
1095 | if (skb_tailroom(skb)) { | |
1096 | skb->data[skb->len] = 0; | |
1097 | __skb_put(skb, 1); | |
1098 | } | |
b4d562e3 EP |
1099 | } |
1100 | } else | |
1101 | urb->transfer_flags |= URB_ZERO_PACKET; | |
3e323f3e | 1102 | } |
1da177e4 | 1103 | |
69ee472f ON |
1104 | spin_lock_irqsave(&dev->txq.lock, flags); |
1105 | retval = usb_autopm_get_interface_async(dev->intf); | |
1106 | if (retval < 0) { | |
1107 | spin_unlock_irqrestore(&dev->txq.lock, flags); | |
1108 | goto drop; | |
1109 | } | |
1110 | ||
1111 | #ifdef CONFIG_PM | |
1112 | /* if this triggers the device is still a sleep */ | |
1113 | if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { | |
1114 | /* transmission will be done in resume */ | |
1115 | usb_anchor_urb(urb, &dev->deferred); | |
1116 | /* no use to process more packets */ | |
1117 | netif_stop_queue(net); | |
1118 | spin_unlock_irqrestore(&dev->txq.lock, flags); | |
60b86755 | 1119 | netdev_dbg(dev->net, "Delaying transmission for resumption\n"); |
69ee472f ON |
1120 | goto deferred; |
1121 | } | |
1122 | #endif | |
1da177e4 | 1123 | |
1da177e4 LT |
1124 | switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { |
1125 | case -EPIPE: | |
1126 | netif_stop_queue (net); | |
2e55cc72 | 1127 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
69ee472f | 1128 | usb_autopm_put_interface_async(dev->intf); |
1da177e4 LT |
1129 | break; |
1130 | default: | |
69ee472f | 1131 | usb_autopm_put_interface_async(dev->intf); |
a475f603 JP |
1132 | netif_dbg(dev, tx_err, dev->net, |
1133 | "tx: submit urb err %d\n", retval); | |
1da177e4 LT |
1134 | break; |
1135 | case 0: | |
1136 | net->trans_start = jiffies; | |
1137 | __skb_queue_tail (&dev->txq, skb); | |
1138 | if (dev->txq.qlen >= TX_QLEN (dev)) | |
1139 | netif_stop_queue (net); | |
1140 | } | |
1141 | spin_unlock_irqrestore (&dev->txq.lock, flags); | |
1142 | ||
1143 | if (retval) { | |
a475f603 | 1144 | netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); |
1da177e4 | 1145 | drop: |
7963837f | 1146 | dev->net->stats.tx_dropped++; |
073285fd | 1147 | not_drop: |
1da177e4 LT |
1148 | if (skb) |
1149 | dev_kfree_skb_any (skb); | |
1150 | usb_free_urb (urb); | |
a475f603 JP |
1151 | } else |
1152 | netif_dbg(dev, tx_queued, dev->net, | |
1153 | "> tx, len %d, type 0x%x\n", length, skb->protocol); | |
69ee472f ON |
1154 | #ifdef CONFIG_PM |
1155 | deferred: | |
1156 | #endif | |
25a79c41 | 1157 | return NETDEV_TX_OK; |
1da177e4 | 1158 | } |
777baa47 | 1159 | EXPORT_SYMBOL_GPL(usbnet_start_xmit); |
1da177e4 LT |
1160 | |
1161 | /*-------------------------------------------------------------------------*/ | |
1162 | ||
1163 | // tasklet (work deferred from completions, in_irq) or timer | |
1164 | ||
1165 | static void usbnet_bh (unsigned long param) | |
1166 | { | |
1167 | struct usbnet *dev = (struct usbnet *) param; | |
1168 | struct sk_buff *skb; | |
1169 | struct skb_data *entry; | |
1170 | ||
1171 | while ((skb = skb_dequeue (&dev->done))) { | |
1172 | entry = (struct skb_data *) skb->cb; | |
1173 | switch (entry->state) { | |
18ab458f | 1174 | case rx_done: |
1da177e4 LT |
1175 | entry->state = rx_cleanup; |
1176 | rx_process (dev, skb); | |
1177 | continue; | |
18ab458f DB |
1178 | case tx_done: |
1179 | case rx_cleanup: | |
1da177e4 LT |
1180 | usb_free_urb (entry->urb); |
1181 | dev_kfree_skb (skb); | |
1182 | continue; | |
18ab458f | 1183 | default: |
60b86755 | 1184 | netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); |
1da177e4 LT |
1185 | } |
1186 | } | |
1187 | ||
1188 | // waiting for all pending urbs to complete? | |
1189 | if (dev->wait) { | |
1190 | if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { | |
1191 | wake_up (dev->wait); | |
1192 | } | |
1193 | ||
1194 | // or are we maybe short a few urbs? | |
8e95a202 JP |
1195 | } else if (netif_running (dev->net) && |
1196 | netif_device_present (dev->net) && | |
1197 | !timer_pending (&dev->delay) && | |
1198 | !test_bit (EVENT_RX_HALT, &dev->flags)) { | |
1da177e4 LT |
1199 | int temp = dev->rxq.qlen; |
1200 | int qlen = RX_QLEN (dev); | |
1201 | ||
1202 | if (temp < qlen) { | |
1203 | struct urb *urb; | |
1204 | int i; | |
1205 | ||
1206 | // don't refill the queue all at once | |
1207 | for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { | |
1208 | urb = usb_alloc_urb (0, GFP_ATOMIC); | |
dacb3975 DM |
1209 | if (urb != NULL) { |
1210 | if (rx_submit (dev, urb, GFP_ATOMIC) == | |
1211 | -ENOLINK) | |
1212 | return; | |
1213 | } | |
1da177e4 | 1214 | } |
a475f603 JP |
1215 | if (temp != dev->rxq.qlen) |
1216 | netif_dbg(dev, link, dev->net, | |
1217 | "rxqlen %d --> %d\n", | |
1218 | temp, dev->rxq.qlen); | |
1da177e4 LT |
1219 | if (dev->rxq.qlen < qlen) |
1220 | tasklet_schedule (&dev->bh); | |
1221 | } | |
1222 | if (dev->txq.qlen < TX_QLEN (dev)) | |
1223 | netif_wake_queue (dev->net); | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | ||
1da177e4 LT |
1228 | /*------------------------------------------------------------------------- |
1229 | * | |
1230 | * USB Device Driver support | |
1231 | * | |
1232 | *-------------------------------------------------------------------------*/ | |
cb1cebbe | 1233 | |
1da177e4 LT |
1234 | // precondition: never called in_interrupt |
1235 | ||
38bde1d4 | 1236 | void usbnet_disconnect (struct usb_interface *intf) |
1da177e4 LT |
1237 | { |
1238 | struct usbnet *dev; | |
1239 | struct usb_device *xdev; | |
1240 | struct net_device *net; | |
1241 | ||
1242 | dev = usb_get_intfdata(intf); | |
1243 | usb_set_intfdata(intf, NULL); | |
1244 | if (!dev) | |
1245 | return; | |
1246 | ||
1247 | xdev = interface_to_usbdev (intf); | |
1248 | ||
a475f603 JP |
1249 | netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", |
1250 | intf->dev.driver->name, | |
1251 | xdev->bus->bus_name, xdev->devpath, | |
1252 | dev->driver_info->description); | |
cb1cebbe | 1253 | |
1da177e4 LT |
1254 | net = dev->net; |
1255 | unregister_netdev (net); | |
1256 | ||
23f333a2 | 1257 | cancel_work_sync(&dev->kevent); |
1da177e4 LT |
1258 | |
1259 | if (dev->driver_info->unbind) | |
1260 | dev->driver_info->unbind (dev, intf); | |
1261 | ||
1262 | free_netdev(net); | |
1263 | usb_put_dev (xdev); | |
1264 | } | |
38bde1d4 | 1265 | EXPORT_SYMBOL_GPL(usbnet_disconnect); |
1da177e4 | 1266 | |
777baa47 SH |
1267 | static const struct net_device_ops usbnet_netdev_ops = { |
1268 | .ndo_open = usbnet_open, | |
1269 | .ndo_stop = usbnet_stop, | |
1270 | .ndo_start_xmit = usbnet_start_xmit, | |
1271 | .ndo_tx_timeout = usbnet_tx_timeout, | |
1272 | .ndo_change_mtu = usbnet_change_mtu, | |
1273 | .ndo_set_mac_address = eth_mac_addr, | |
1274 | .ndo_validate_addr = eth_validate_addr, | |
1275 | }; | |
1da177e4 LT |
1276 | |
1277 | /*-------------------------------------------------------------------------*/ | |
1278 | ||
1da177e4 LT |
1279 | // precondition: never called in_interrupt |
1280 | ||
225794f8 MH |
1281 | static struct device_type wlan_type = { |
1282 | .name = "wlan", | |
1283 | }; | |
1284 | ||
1285 | static struct device_type wwan_type = { | |
1286 | .name = "wwan", | |
1287 | }; | |
1288 | ||
38bde1d4 | 1289 | int |
1da177e4 LT |
1290 | usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) |
1291 | { | |
1292 | struct usbnet *dev; | |
cb1cebbe | 1293 | struct net_device *net; |
1da177e4 LT |
1294 | struct usb_host_interface *interface; |
1295 | struct driver_info *info; | |
1296 | struct usb_device *xdev; | |
1297 | int status; | |
296c0242 | 1298 | const char *name; |
b0786b43 ML |
1299 | struct usb_driver *driver = to_usb_driver(udev->dev.driver); |
1300 | ||
1301 | /* usbnet already took usb runtime pm, so have to enable the feature | |
1302 | * for usb interface, otherwise usb_autopm_get_interface may return | |
1303 | * failure if USB_SUSPEND(RUNTIME_PM) is enabled. | |
1304 | */ | |
1305 | if (!driver->supports_autosuspend) { | |
1306 | driver->supports_autosuspend = 1; | |
1307 | pm_runtime_enable(&udev->dev); | |
1308 | } | |
1da177e4 | 1309 | |
296c0242 | 1310 | name = udev->dev.driver->name; |
1da177e4 LT |
1311 | info = (struct driver_info *) prod->driver_info; |
1312 | if (!info) { | |
296c0242 | 1313 | dev_dbg (&udev->dev, "blacklisted by %s\n", name); |
1da177e4 LT |
1314 | return -ENODEV; |
1315 | } | |
1316 | xdev = interface_to_usbdev (udev); | |
1317 | interface = udev->cur_altsetting; | |
1318 | ||
1319 | usb_get_dev (xdev); | |
1320 | ||
1321 | status = -ENOMEM; | |
1322 | ||
1323 | // set up our own records | |
1324 | net = alloc_etherdev(sizeof(*dev)); | |
1325 | if (!net) { | |
1326 | dbg ("can't kmalloc dev"); | |
1327 | goto out; | |
1328 | } | |
1329 | ||
0dacca73 BH |
1330 | /* netdev_printk() needs this so do it as early as possible */ |
1331 | SET_NETDEV_DEV(net, &udev->dev); | |
1332 | ||
1da177e4 LT |
1333 | dev = netdev_priv(net); |
1334 | dev->udev = xdev; | |
a11a6544 | 1335 | dev->intf = udev; |
1da177e4 | 1336 | dev->driver_info = info; |
296c0242 | 1337 | dev->driver_name = name; |
1da177e4 LT |
1338 | dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV |
1339 | | NETIF_MSG_PROBE | NETIF_MSG_LINK); | |
1340 | skb_queue_head_init (&dev->rxq); | |
1341 | skb_queue_head_init (&dev->txq); | |
1342 | skb_queue_head_init (&dev->done); | |
7834ddbc | 1343 | skb_queue_head_init(&dev->rxq_pause); |
1da177e4 LT |
1344 | dev->bh.func = usbnet_bh; |
1345 | dev->bh.data = (unsigned long) dev; | |
c4028958 | 1346 | INIT_WORK (&dev->kevent, kevent); |
69ee472f | 1347 | init_usb_anchor(&dev->deferred); |
1da177e4 LT |
1348 | dev->delay.function = usbnet_bh; |
1349 | dev->delay.data = (unsigned long) dev; | |
1350 | init_timer (&dev->delay); | |
a9fc6338 | 1351 | mutex_init (&dev->phy_mutex); |
1da177e4 | 1352 | |
1da177e4 LT |
1353 | dev->net = net; |
1354 | strcpy (net->name, "usb%d"); | |
1355 | memcpy (net->dev_addr, node_id, sizeof node_id); | |
1356 | ||
2e55cc72 DB |
1357 | /* rx and tx sides can use different message sizes; |
1358 | * bind() should set rx_urb_size in that case. | |
1359 | */ | |
1360 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
1da177e4 LT |
1361 | #if 0 |
1362 | // dma_supported() is deeply broken on almost all architectures | |
1363 | // possible with some EHCI controllers | |
6a35528a | 1364 | if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) |
1da177e4 LT |
1365 | net->features |= NETIF_F_HIGHDMA; |
1366 | #endif | |
1367 | ||
777baa47 | 1368 | net->netdev_ops = &usbnet_netdev_ops; |
777baa47 | 1369 | net->watchdog_timeo = TX_TIMEOUT_JIFFIES; |
1da177e4 LT |
1370 | net->ethtool_ops = &usbnet_ethtool_ops; |
1371 | ||
1372 | // allow device-specific bind/init procedures | |
1373 | // NOTE net->name still not usable ... | |
1374 | if (info->bind) { | |
1375 | status = info->bind (dev, udev); | |
cb1cebbe DB |
1376 | if (status < 0) |
1377 | goto out1; | |
1378 | ||
1da177e4 LT |
1379 | // heuristic: "usb%d" for links we know are two-host, |
1380 | // else "eth%d" when there's reasonable doubt. userspace | |
1381 | // can rename the link if it knows better. | |
8e95a202 | 1382 | if ((dev->driver_info->flags & FLAG_ETHER) != 0 && |
c261344d AB |
1383 | ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || |
1384 | (net->dev_addr [0] & 0x02) == 0)) | |
1da177e4 | 1385 | strcpy (net->name, "eth%d"); |
6e3bbcc5 JK |
1386 | /* WLAN devices should always be named "wlan%d" */ |
1387 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) | |
1388 | strcpy(net->name, "wlan%d"); | |
e1e499ee MH |
1389 | /* WWAN devices should always be named "wwan%d" */ |
1390 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) | |
1391 | strcpy(net->name, "wwan%d"); | |
f29fc259 DB |
1392 | |
1393 | /* maybe the remote can't receive an Ethernet MTU */ | |
1394 | if (net->mtu > (dev->hard_mtu - net->hard_header_len)) | |
1395 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
2e55cc72 DB |
1396 | } else if (!info->in || !info->out) |
1397 | status = usbnet_get_endpoints (dev, udev); | |
1da177e4 LT |
1398 | else { |
1399 | dev->in = usb_rcvbulkpipe (xdev, info->in); | |
1400 | dev->out = usb_sndbulkpipe (xdev, info->out); | |
1401 | if (!(info->flags & FLAG_NO_SETINT)) | |
1402 | status = usb_set_interface (xdev, | |
1403 | interface->desc.bInterfaceNumber, | |
1404 | interface->desc.bAlternateSetting); | |
1405 | else | |
1406 | status = 0; | |
1407 | ||
1408 | } | |
9514bfe5 | 1409 | if (status >= 0 && dev->status) |
1da177e4 LT |
1410 | status = init_status (dev, udev); |
1411 | if (status < 0) | |
cb1cebbe | 1412 | goto out3; |
1da177e4 | 1413 | |
2e55cc72 DB |
1414 | if (!dev->rx_urb_size) |
1415 | dev->rx_urb_size = dev->hard_mtu; | |
1da177e4 | 1416 | dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); |
cb1cebbe | 1417 | |
225794f8 MH |
1418 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) |
1419 | SET_NETDEV_DEVTYPE(net, &wlan_type); | |
1420 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) | |
1421 | SET_NETDEV_DEVTYPE(net, &wwan_type); | |
1422 | ||
1da177e4 LT |
1423 | status = register_netdev (net); |
1424 | if (status) | |
1425 | goto out3; | |
a475f603 JP |
1426 | netif_info(dev, probe, dev->net, |
1427 | "register '%s' at usb-%s-%s, %s, %pM\n", | |
1428 | udev->dev.driver->name, | |
1429 | xdev->bus->bus_name, xdev->devpath, | |
1430 | dev->driver_info->description, | |
1431 | net->dev_addr); | |
1da177e4 LT |
1432 | |
1433 | // ok, it's ready to go. | |
1434 | usb_set_intfdata (udev, dev); | |
1435 | ||
1da177e4 LT |
1436 | netif_device_attach (net); |
1437 | ||
37e8273c BH |
1438 | if (dev->driver_info->flags & FLAG_LINK_INTR) |
1439 | netif_carrier_off(net); | |
1440 | ||
1da177e4 LT |
1441 | return 0; |
1442 | ||
1443 | out3: | |
1444 | if (info->unbind) | |
1445 | info->unbind (dev, udev); | |
1446 | out1: | |
1447 | free_netdev(net); | |
1448 | out: | |
1449 | usb_put_dev(xdev); | |
1450 | return status; | |
1451 | } | |
38bde1d4 | 1452 | EXPORT_SYMBOL_GPL(usbnet_probe); |
1da177e4 LT |
1453 | |
1454 | /*-------------------------------------------------------------------------*/ | |
1455 | ||
36433127 ON |
1456 | /* |
1457 | * suspend the whole driver as soon as the first interface is suspended | |
1458 | * resume only when the last interface is resumed | |
38bde1d4 | 1459 | */ |
1da177e4 | 1460 | |
38bde1d4 | 1461 | int usbnet_suspend (struct usb_interface *intf, pm_message_t message) |
1da177e4 LT |
1462 | { |
1463 | struct usbnet *dev = usb_get_intfdata(intf); | |
cb1cebbe | 1464 | |
36433127 | 1465 | if (!dev->suspend_count++) { |
69ee472f ON |
1466 | spin_lock_irq(&dev->txq.lock); |
1467 | /* don't autosuspend while transmitting */ | |
1468 | if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) { | |
1469 | spin_unlock_irq(&dev->txq.lock); | |
1470 | return -EBUSY; | |
1471 | } else { | |
1472 | set_bit(EVENT_DEV_ASLEEP, &dev->flags); | |
1473 | spin_unlock_irq(&dev->txq.lock); | |
1474 | } | |
a11a6544 ON |
1475 | /* |
1476 | * accelerate emptying of the rx and queues, to avoid | |
36433127 ON |
1477 | * having everything error out. |
1478 | */ | |
1479 | netif_device_detach (dev->net); | |
69ee472f ON |
1480 | usbnet_terminate_urbs(dev); |
1481 | usb_kill_urb(dev->interrupt); | |
1482 | ||
a11a6544 ON |
1483 | /* |
1484 | * reattach so runtime management can use and | |
1485 | * wake the device | |
1486 | */ | |
1487 | netif_device_attach (dev->net); | |
36433127 | 1488 | } |
1da177e4 LT |
1489 | return 0; |
1490 | } | |
38bde1d4 | 1491 | EXPORT_SYMBOL_GPL(usbnet_suspend); |
1da177e4 | 1492 | |
38bde1d4 | 1493 | int usbnet_resume (struct usb_interface *intf) |
1da177e4 LT |
1494 | { |
1495 | struct usbnet *dev = usb_get_intfdata(intf); | |
69ee472f ON |
1496 | struct sk_buff *skb; |
1497 | struct urb *res; | |
1498 | int retval; | |
1499 | ||
1500 | if (!--dev->suspend_count) { | |
1501 | spin_lock_irq(&dev->txq.lock); | |
1502 | while ((res = usb_get_from_anchor(&dev->deferred))) { | |
1503 | ||
69ee472f ON |
1504 | skb = (struct sk_buff *)res->context; |
1505 | retval = usb_submit_urb(res, GFP_ATOMIC); | |
1506 | if (retval < 0) { | |
1507 | dev_kfree_skb_any(skb); | |
1508 | usb_free_urb(res); | |
1509 | usb_autopm_put_interface_async(dev->intf); | |
1510 | } else { | |
1511 | dev->net->trans_start = jiffies; | |
1512 | __skb_queue_tail(&dev->txq, skb); | |
1513 | } | |
1514 | } | |
1da177e4 | 1515 | |
69ee472f ON |
1516 | smp_mb(); |
1517 | clear_bit(EVENT_DEV_ASLEEP, &dev->flags); | |
1518 | spin_unlock_irq(&dev->txq.lock); | |
1519 | if (!(dev->txq.qlen >= TX_QLEN(dev))) | |
1520 | netif_start_queue(dev->net); | |
36433127 | 1521 | tasklet_schedule (&dev->bh); |
69ee472f | 1522 | } |
1da177e4 LT |
1523 | return 0; |
1524 | } | |
38bde1d4 | 1525 | EXPORT_SYMBOL_GPL(usbnet_resume); |
1da177e4 | 1526 | |
1da177e4 | 1527 | |
1da177e4 LT |
1528 | /*-------------------------------------------------------------------------*/ |
1529 | ||
f29fc259 | 1530 | static int __init usbnet_init(void) |
1da177e4 | 1531 | { |
c582a950 TF |
1532 | /* Compiler should optimize this out. */ |
1533 | BUILD_BUG_ON( | |
1534 | FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); | |
1da177e4 LT |
1535 | |
1536 | random_ether_addr(node_id); | |
cb1cebbe | 1537 | return 0; |
1da177e4 | 1538 | } |
f29fc259 | 1539 | module_init(usbnet_init); |
1da177e4 | 1540 | |
f29fc259 | 1541 | static void __exit usbnet_exit(void) |
1da177e4 | 1542 | { |
1da177e4 | 1543 | } |
f29fc259 | 1544 | module_exit(usbnet_exit); |
1da177e4 | 1545 | |
f29fc259 | 1546 | MODULE_AUTHOR("David Brownell"); |
090ffa9d | 1547 | MODULE_DESCRIPTION("USB network driver framework"); |
f29fc259 | 1548 | MODULE_LICENSE("GPL"); |