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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 | |
9cb00073 | 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
1da177e4 LT |
18 | */ |
19 | ||
20 | /* | |
21 | * This is a generic "USB networking" framework that works with several | |
090ffa9d DB |
22 | * kinds of full and high speed networking devices: host-to-host cables, |
23 | * smart usb peripherals, and actual Ethernet adapters. | |
1da177e4 | 24 | * |
090ffa9d DB |
25 | * These devices usually differ in terms of control protocols (if they |
26 | * even have one!) and sometimes they define new framing to wrap or batch | |
27 | * Ethernet packets. Otherwise, they talk to USB pretty much the same, | |
28 | * so interface (un)binding, endpoint I/O queues, fault handling, and other | |
29 | * issues can usefully be addressed by this framework. | |
30 | */ | |
1da177e4 LT |
31 | |
32 | // #define DEBUG // error path messages, extra info | |
33 | // #define VERBOSE // more; success messages | |
34 | ||
1da177e4 | 35 | #include <linux/module.h> |
1da177e4 LT |
36 | #include <linux/init.h> |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/etherdevice.h> | |
03ad032b | 39 | #include <linux/ctype.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> |
5a0e3ad6 | 45 | #include <linux/slab.h> |
fd1f170d | 46 | #include <linux/kernel.h> |
b0786b43 | 47 | #include <linux/pm_runtime.h> |
f29fc259 DB |
48 | |
49 | #define DRIVER_VERSION "22-Aug-2005" | |
1da177e4 LT |
50 | |
51 | ||
52 | /*-------------------------------------------------------------------------*/ | |
53 | ||
54 | /* | |
55 | * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. | |
56 | * Several dozen bytes of IPv4 data can fit in two such transactions. | |
57 | * One maximum size Ethernet packet takes twenty four of them. | |
58 | * For high speed, each frame comfortably fits almost 36 max size | |
59 | * Ethernet packets (so queues should be bigger). | |
f29fc259 | 60 | * |
a88c32ae ML |
61 | * The goal is to let the USB host controller be busy for 5msec or |
62 | * more before an irq is required, under load. Jumbograms change | |
63 | * the equation. | |
1da177e4 | 64 | */ |
a88c32ae ML |
65 | #define MAX_QUEUE_MEMORY (60 * 1518) |
66 | #define RX_QLEN(dev) ((dev)->rx_qlen) | |
67 | #define TX_QLEN(dev) ((dev)->tx_qlen) | |
1da177e4 | 68 | |
1da177e4 LT |
69 | // reawaken network queue this soon after stopping; else watchdog barks |
70 | #define TX_TIMEOUT_JIFFIES (5*HZ) | |
71 | ||
37ebb549 PM |
72 | /* throttle rx/tx briefly after some faults, so hub_wq might disconnect() |
73 | * us (it polls at HZ/4 usually) before we report too many false errors. | |
74 | */ | |
1da177e4 LT |
75 | #define THROTTLE_JIFFIES (HZ/8) |
76 | ||
1da177e4 LT |
77 | // between wakeups |
78 | #define UNLINK_TIMEOUT_MS 3 | |
79 | ||
80 | /*-------------------------------------------------------------------------*/ | |
81 | ||
82 | // randomly generated ethernet address | |
83 | static u8 node_id [ETH_ALEN]; | |
84 | ||
1da177e4 LT |
85 | static const char driver_name [] = "usbnet"; |
86 | ||
87 | /* use ethtool to change the level for any given device */ | |
88 | static int msg_level = -1; | |
89 | module_param (msg_level, int, 0); | |
90 | MODULE_PARM_DESC (msg_level, "Override default message level"); | |
91 | ||
1da177e4 LT |
92 | /*-------------------------------------------------------------------------*/ |
93 | ||
1da177e4 | 94 | /* handles CDC Ethernet and many other network "bulk data" interfaces */ |
2e55cc72 | 95 | int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) |
1da177e4 LT |
96 | { |
97 | int tmp; | |
98 | struct usb_host_interface *alt = NULL; | |
99 | struct usb_host_endpoint *in = NULL, *out = NULL; | |
100 | struct usb_host_endpoint *status = NULL; | |
101 | ||
102 | for (tmp = 0; tmp < intf->num_altsetting; tmp++) { | |
103 | unsigned ep; | |
104 | ||
105 | in = out = status = NULL; | |
106 | alt = intf->altsetting + tmp; | |
107 | ||
108 | /* take the first altsetting with in-bulk + out-bulk; | |
109 | * remember any status endpoint, just in case; | |
70f23fd6 | 110 | * ignore other endpoints and altsettings. |
1da177e4 LT |
111 | */ |
112 | for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { | |
113 | struct usb_host_endpoint *e; | |
114 | int intr = 0; | |
115 | ||
116 | e = alt->endpoint + ep; | |
117 | switch (e->desc.bmAttributes) { | |
118 | case USB_ENDPOINT_XFER_INT: | |
fc6e2544 | 119 | if (!usb_endpoint_dir_in(&e->desc)) |
1da177e4 LT |
120 | continue; |
121 | intr = 1; | |
122 | /* FALLTHROUGH */ | |
123 | case USB_ENDPOINT_XFER_BULK: | |
124 | break; | |
125 | default: | |
126 | continue; | |
127 | } | |
fc6e2544 | 128 | if (usb_endpoint_dir_in(&e->desc)) { |
1da177e4 LT |
129 | if (!intr && !in) |
130 | in = e; | |
131 | else if (intr && !status) | |
132 | status = e; | |
133 | } else { | |
134 | if (!out) | |
135 | out = e; | |
136 | } | |
137 | } | |
138 | if (in && out) | |
139 | break; | |
140 | } | |
141 | if (!alt || !in || !out) | |
142 | return -EINVAL; | |
143 | ||
8e95a202 JP |
144 | if (alt->desc.bAlternateSetting != 0 || |
145 | !(dev->driver_info->flags & FLAG_NO_SETINT)) { | |
1da177e4 LT |
146 | tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, |
147 | alt->desc.bAlternateSetting); | |
148 | if (tmp < 0) | |
149 | return tmp; | |
150 | } | |
cb1cebbe | 151 | |
1da177e4 LT |
152 | dev->in = usb_rcvbulkpipe (dev->udev, |
153 | in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
154 | dev->out = usb_sndbulkpipe (dev->udev, | |
155 | out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
156 | dev->status = status; | |
157 | return 0; | |
158 | } | |
2e55cc72 | 159 | EXPORT_SYMBOL_GPL(usbnet_get_endpoints); |
1da177e4 | 160 | |
03ad032b PH |
161 | int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) |
162 | { | |
51487ae7 | 163 | int tmp = -1, ret; |
03ad032b PH |
164 | unsigned char buf [13]; |
165 | ||
51487ae7 AS |
166 | ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); |
167 | if (ret == 12) | |
168 | tmp = hex2bin(dev->net->dev_addr, buf, 6); | |
169 | if (tmp < 0) { | |
03ad032b PH |
170 | dev_dbg(&dev->udev->dev, |
171 | "bad MAC string %d fetch, %d\n", iMACAddress, tmp); | |
51487ae7 AS |
172 | if (ret >= 0) |
173 | ret = -EINVAL; | |
174 | return ret; | |
03ad032b | 175 | } |
03ad032b PH |
176 | return 0; |
177 | } | |
178 | EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); | |
179 | ||
24ead299 | 180 | static void intr_complete (struct urb *urb) |
181 | { | |
182 | struct usbnet *dev = urb->context; | |
183 | int status = urb->status; | |
184 | ||
185 | switch (status) { | |
186 | /* success */ | |
187 | case 0: | |
188 | dev->driver_info->status(dev, urb); | |
189 | break; | |
190 | ||
191 | /* software-driven interface shutdown */ | |
192 | case -ENOENT: /* urb killed */ | |
193 | case -ESHUTDOWN: /* hardware gone */ | |
194 | netif_dbg(dev, ifdown, dev->net, | |
195 | "intr shutdown, code %d\n", status); | |
196 | return; | |
197 | ||
198 | /* NOTE: not throttling like RX/TX, since this endpoint | |
199 | * already polls infrequently | |
200 | */ | |
201 | default: | |
202 | netdev_dbg(dev->net, "intr status %d\n", status); | |
203 | break; | |
204 | } | |
205 | ||
24ead299 | 206 | status = usb_submit_urb (urb, GFP_ATOMIC); |
207 | if (status != 0) | |
208 | netif_err(dev, timer, dev->net, | |
209 | "intr resubmit --> %d\n", status); | |
210 | } | |
1da177e4 LT |
211 | |
212 | static int init_status (struct usbnet *dev, struct usb_interface *intf) | |
213 | { | |
214 | char *buf = NULL; | |
215 | unsigned pipe = 0; | |
216 | unsigned maxp; | |
217 | unsigned period; | |
218 | ||
219 | if (!dev->driver_info->status) | |
220 | return 0; | |
221 | ||
222 | pipe = usb_rcvintpipe (dev->udev, | |
223 | dev->status->desc.bEndpointAddress | |
224 | & USB_ENDPOINT_NUMBER_MASK); | |
225 | maxp = usb_maxpacket (dev->udev, pipe, 0); | |
226 | ||
227 | /* avoid 1 msec chatter: min 8 msec poll rate */ | |
228 | period = max ((int) dev->status->desc.bInterval, | |
229 | (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); | |
230 | ||
e94b1766 | 231 | buf = kmalloc (maxp, GFP_KERNEL); |
1da177e4 | 232 | if (buf) { |
e94b1766 | 233 | dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); |
1da177e4 LT |
234 | if (!dev->interrupt) { |
235 | kfree (buf); | |
236 | return -ENOMEM; | |
237 | } else { | |
238 | usb_fill_int_urb(dev->interrupt, dev->udev, pipe, | |
239 | buf, maxp, intr_complete, dev, period); | |
720f3d7c | 240 | dev->interrupt->transfer_flags |= URB_FREE_BUFFER; |
1da177e4 LT |
241 | dev_dbg(&intf->dev, |
242 | "status ep%din, %d bytes period %d\n", | |
243 | usb_pipeendpoint(pipe), maxp, period); | |
244 | } | |
245 | } | |
18ab458f | 246 | return 0; |
1da177e4 LT |
247 | } |
248 | ||
6eecdc5f DW |
249 | /* Submit the interrupt URB if not previously submitted, increasing refcount */ |
250 | int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) | |
251 | { | |
252 | int ret = 0; | |
253 | ||
254 | WARN_ON_ONCE(dev->interrupt == NULL); | |
255 | if (dev->interrupt) { | |
256 | mutex_lock(&dev->interrupt_mutex); | |
257 | ||
258 | if (++dev->interrupt_count == 1) | |
259 | ret = usb_submit_urb(dev->interrupt, mem_flags); | |
260 | ||
261 | dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", | |
262 | dev->interrupt_count); | |
263 | mutex_unlock(&dev->interrupt_mutex); | |
264 | } | |
265 | return ret; | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(usbnet_status_start); | |
268 | ||
269 | /* For resume; submit interrupt URB if previously submitted */ | |
270 | static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) | |
271 | { | |
272 | int ret = 0; | |
273 | ||
274 | mutex_lock(&dev->interrupt_mutex); | |
275 | if (dev->interrupt_count) { | |
276 | ret = usb_submit_urb(dev->interrupt, mem_flags); | |
277 | dev_dbg(&dev->udev->dev, | |
278 | "submitted interrupt URB for resume\n"); | |
279 | } | |
280 | mutex_unlock(&dev->interrupt_mutex); | |
281 | return ret; | |
282 | } | |
283 | ||
284 | /* Kill the interrupt URB if all submitters want it killed */ | |
285 | void usbnet_status_stop(struct usbnet *dev) | |
286 | { | |
287 | if (dev->interrupt) { | |
288 | mutex_lock(&dev->interrupt_mutex); | |
289 | WARN_ON(dev->interrupt_count == 0); | |
290 | ||
291 | if (dev->interrupt_count && --dev->interrupt_count == 0) | |
292 | usb_kill_urb(dev->interrupt); | |
293 | ||
294 | dev_dbg(&dev->udev->dev, | |
295 | "decremented interrupt URB count to %d\n", | |
296 | dev->interrupt_count); | |
297 | mutex_unlock(&dev->interrupt_mutex); | |
298 | } | |
299 | } | |
300 | EXPORT_SYMBOL_GPL(usbnet_status_stop); | |
301 | ||
302 | /* For suspend; always kill interrupt URB */ | |
303 | static void __usbnet_status_stop_force(struct usbnet *dev) | |
304 | { | |
305 | if (dev->interrupt) { | |
306 | mutex_lock(&dev->interrupt_mutex); | |
307 | usb_kill_urb(dev->interrupt); | |
308 | dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); | |
309 | mutex_unlock(&dev->interrupt_mutex); | |
310 | } | |
311 | } | |
312 | ||
2e55cc72 DB |
313 | /* Passes this packet up the stack, updating its accounting. |
314 | * Some link protocols batch packets, so their rx_fixup paths | |
315 | * can return clones as well as just modify the original skb. | |
316 | */ | |
317 | void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) | |
1da177e4 LT |
318 | { |
319 | int status; | |
320 | ||
7834ddbc JK |
321 | if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { |
322 | skb_queue_tail(&dev->rxq_pause, skb); | |
323 | return; | |
324 | } | |
325 | ||
81e0ce79 BM |
326 | /* only update if unset to allow minidriver rx_fixup override */ |
327 | if (skb->protocol == 0) | |
328 | skb->protocol = eth_type_trans (skb, dev->net); | |
329 | ||
7963837f HX |
330 | dev->net->stats.rx_packets++; |
331 | dev->net->stats.rx_bytes += skb->len; | |
1da177e4 | 332 | |
a475f603 JP |
333 | netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", |
334 | skb->len + sizeof (struct ethhdr), skb->protocol); | |
1da177e4 | 335 | memset (skb->cb, 0, sizeof (struct skb_data)); |
f9b491ec MR |
336 | |
337 | if (skb_defer_rx_timestamp(skb)) | |
338 | return; | |
339 | ||
1da177e4 | 340 | status = netif_rx (skb); |
a475f603 JP |
341 | if (status != NET_RX_SUCCESS) |
342 | netif_dbg(dev, rx_err, dev->net, | |
343 | "netif_rx status %d\n", status); | |
1da177e4 | 344 | } |
2e55cc72 | 345 | EXPORT_SYMBOL_GPL(usbnet_skb_return); |
1da177e4 | 346 | |
a88c32ae ML |
347 | /* must be called if hard_mtu or rx_urb_size changed */ |
348 | void usbnet_update_max_qlen(struct usbnet *dev) | |
349 | { | |
350 | enum usb_device_speed speed = dev->udev->speed; | |
351 | ||
352 | switch (speed) { | |
353 | case USB_SPEED_HIGH: | |
354 | dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; | |
355 | dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; | |
356 | break; | |
452c447a | 357 | case USB_SPEED_SUPER: |
ea079842 | 358 | case USB_SPEED_SUPER_PLUS: |
452c447a ML |
359 | /* |
360 | * Not take default 5ms qlen for super speed HC to | |
361 | * save memory, and iperf tests show 2.5ms qlen can | |
362 | * work well | |
363 | */ | |
364 | dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; | |
365 | dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; | |
366 | break; | |
a88c32ae ML |
367 | default: |
368 | dev->rx_qlen = dev->tx_qlen = 4; | |
369 | } | |
370 | } | |
371 | EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); | |
372 | ||
1da177e4 LT |
373 | \f |
374 | /*------------------------------------------------------------------------- | |
375 | * | |
376 | * Network Device Driver (peer link to "Host Device", from USB host) | |
377 | * | |
378 | *-------------------------------------------------------------------------*/ | |
379 | ||
777baa47 | 380 | int usbnet_change_mtu (struct net_device *net, int new_mtu) |
1da177e4 LT |
381 | { |
382 | struct usbnet *dev = netdev_priv(net); | |
f29fc259 | 383 | int ll_mtu = new_mtu + net->hard_header_len; |
a99c1949 JP |
384 | int old_hard_mtu = dev->hard_mtu; |
385 | int old_rx_urb_size = dev->rx_urb_size; | |
1da177e4 | 386 | |
1da177e4 | 387 | // no second zero-length packet read wanted after mtu-sized packets |
f29fc259 | 388 | if ((ll_mtu % dev->maxpacket) == 0) |
1da177e4 LT |
389 | return -EDOM; |
390 | net->mtu = new_mtu; | |
a99c1949 JP |
391 | |
392 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
393 | if (dev->rx_urb_size == old_hard_mtu) { | |
394 | dev->rx_urb_size = dev->hard_mtu; | |
43daa96b SL |
395 | if (dev->rx_urb_size > old_rx_urb_size) { |
396 | usbnet_pause_rx(dev); | |
a99c1949 | 397 | usbnet_unlink_rx_urbs(dev); |
43daa96b SL |
398 | usbnet_resume_rx(dev); |
399 | } | |
a99c1949 JP |
400 | } |
401 | ||
a88c32ae ML |
402 | /* max qlen depend on hard_mtu and rx_urb_size */ |
403 | usbnet_update_max_qlen(dev); | |
404 | ||
1da177e4 LT |
405 | return 0; |
406 | } | |
777baa47 | 407 | EXPORT_SYMBOL_GPL(usbnet_change_mtu); |
1da177e4 | 408 | |
5b6e9bcd ML |
409 | /* The caller must hold list->lock */ |
410 | static void __usbnet_queue_skb(struct sk_buff_head *list, | |
411 | struct sk_buff *newsk, enum skb_state state) | |
412 | { | |
413 | struct skb_data *entry = (struct skb_data *) newsk->cb; | |
414 | ||
415 | __skb_queue_tail(list, newsk); | |
416 | entry->state = state; | |
417 | } | |
418 | ||
1da177e4 LT |
419 | /*-------------------------------------------------------------------------*/ |
420 | ||
1da177e4 LT |
421 | /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from |
422 | * completion callbacks. 2.5 should have fixed those bugs... | |
423 | */ | |
424 | ||
5b6e9bcd ML |
425 | static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, |
426 | struct sk_buff_head *list, enum skb_state state) | |
1da177e4 | 427 | { |
1da177e4 | 428 | unsigned long flags; |
5b6e9bcd ML |
429 | enum skb_state old_state; |
430 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
1da177e4 | 431 | |
8728b834 | 432 | spin_lock_irqsave(&list->lock, flags); |
5b6e9bcd ML |
433 | old_state = entry->state; |
434 | entry->state = state; | |
8728b834 | 435 | __skb_unlink(skb, list); |
fcb0bb6a ES |
436 | |
437 | /* defer_bh() is never called with list == &dev->done. | |
438 | * spin_lock_nested() tells lockdep that it is OK to take | |
439 | * dev->done.lock here with list->lock held. | |
440 | */ | |
441 | spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); | |
442 | ||
8728b834 | 443 | __skb_queue_tail(&dev->done, skb); |
1da177e4 | 444 | if (dev->done.qlen == 1) |
8728b834 | 445 | tasklet_schedule(&dev->bh); |
fcb0bb6a ES |
446 | spin_unlock(&dev->done.lock); |
447 | spin_unlock_irqrestore(&list->lock, flags); | |
5b6e9bcd | 448 | return old_state; |
1da177e4 LT |
449 | } |
450 | ||
451 | /* some work can't be done in tasklets, so we use keventd | |
452 | * | |
453 | * NOTE: annoying asymmetry: if it's active, schedule_work() fails, | |
454 | * but tasklet_schedule() doesn't. hope the failure is rare. | |
455 | */ | |
2e55cc72 | 456 | void usbnet_defer_kevent (struct usbnet *dev, int work) |
1da177e4 LT |
457 | { |
458 | set_bit (work, &dev->flags); | |
9532021d SG |
459 | if (!schedule_work (&dev->kevent)) { |
460 | if (net_ratelimit()) | |
461 | netdev_err(dev->net, "kevent %d may have been dropped\n", work); | |
462 | } else { | |
60b86755 | 463 | netdev_dbg(dev->net, "kevent %d scheduled\n", work); |
9532021d | 464 | } |
1da177e4 | 465 | } |
2e55cc72 | 466 | EXPORT_SYMBOL_GPL(usbnet_defer_kevent); |
1da177e4 LT |
467 | |
468 | /*-------------------------------------------------------------------------*/ | |
469 | ||
7d12e780 | 470 | static void rx_complete (struct urb *urb); |
1da177e4 | 471 | |
dacb3975 | 472 | static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) |
1da177e4 LT |
473 | { |
474 | struct sk_buff *skb; | |
475 | struct skb_data *entry; | |
476 | int retval = 0; | |
477 | unsigned long lockflags; | |
2e55cc72 | 478 | size_t size = dev->rx_urb_size; |
1da177e4 | 479 | |
70c37bf9 BM |
480 | /* prevent rx skb allocation when error ratio is high */ |
481 | if (test_bit(EVENT_RX_KILL, &dev->flags)) { | |
482 | usb_free_urb(urb); | |
483 | return -ENOLINK; | |
484 | } | |
485 | ||
7bdd4027 ED |
486 | skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); |
487 | if (!skb) { | |
a475f603 | 488 | netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); |
2e55cc72 | 489 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
1da177e4 | 490 | usb_free_urb (urb); |
dacb3975 | 491 | return -ENOMEM; |
1da177e4 | 492 | } |
1da177e4 LT |
493 | |
494 | entry = (struct skb_data *) skb->cb; | |
495 | entry->urb = urb; | |
496 | entry->dev = dev; | |
1da177e4 LT |
497 | entry->length = 0; |
498 | ||
499 | usb_fill_bulk_urb (urb, dev->udev, dev->in, | |
500 | skb->data, size, rx_complete, skb); | |
1da177e4 LT |
501 | |
502 | spin_lock_irqsave (&dev->rxq.lock, lockflags); | |
503 | ||
8e95a202 JP |
504 | if (netif_running (dev->net) && |
505 | netif_device_present (dev->net) && | |
69ee472f ON |
506 | !test_bit (EVENT_RX_HALT, &dev->flags) && |
507 | !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { | |
18ab458f | 508 | switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { |
1da177e4 | 509 | case -EPIPE: |
2e55cc72 | 510 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
1da177e4 LT |
511 | break; |
512 | case -ENOMEM: | |
2e55cc72 | 513 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
1da177e4 LT |
514 | break; |
515 | case -ENODEV: | |
a475f603 | 516 | netif_dbg(dev, ifdown, dev->net, "device gone\n"); |
1da177e4 LT |
517 | netif_device_detach (dev->net); |
518 | break; | |
dacb3975 DM |
519 | case -EHOSTUNREACH: |
520 | retval = -ENOLINK; | |
521 | break; | |
1da177e4 | 522 | default: |
a475f603 JP |
523 | netif_dbg(dev, rx_err, dev->net, |
524 | "rx submit, %d\n", retval); | |
1da177e4 LT |
525 | tasklet_schedule (&dev->bh); |
526 | break; | |
527 | case 0: | |
5b6e9bcd | 528 | __usbnet_queue_skb(&dev->rxq, skb, rx_start); |
1da177e4 LT |
529 | } |
530 | } else { | |
a475f603 | 531 | netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); |
1da177e4 LT |
532 | retval = -ENOLINK; |
533 | } | |
534 | spin_unlock_irqrestore (&dev->rxq.lock, lockflags); | |
535 | if (retval) { | |
536 | dev_kfree_skb_any (skb); | |
537 | usb_free_urb (urb); | |
538 | } | |
dacb3975 | 539 | return retval; |
1da177e4 LT |
540 | } |
541 | ||
542 | ||
543 | /*-------------------------------------------------------------------------*/ | |
544 | ||
545 | static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) | |
546 | { | |
8e95a202 | 547 | if (dev->driver_info->rx_fixup && |
7a635ea9 AZ |
548 | !dev->driver_info->rx_fixup (dev, skb)) { |
549 | /* With RX_ASSEMBLE, rx_fixup() must update counters */ | |
550 | if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) | |
551 | dev->net->stats.rx_errors++; | |
552 | goto done; | |
553 | } | |
1da177e4 LT |
554 | // else network stack removes extra byte if we forced a short packet |
555 | ||
eb85569f EG |
556 | /* all data was already cloned from skb inside the driver */ |
557 | if (dev->driver_info->flags & FLAG_MULTI_PACKET) | |
558 | goto done; | |
559 | ||
560 | if (skb->len < ETH_HLEN) { | |
561 | dev->net->stats.rx_errors++; | |
562 | dev->net->stats.rx_length_errors++; | |
563 | netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); | |
564 | } else { | |
565 | usbnet_skb_return(dev, skb); | |
073285fd | 566 | return; |
1da177e4 | 567 | } |
073285fd | 568 | |
7a635ea9 | 569 | done: |
073285fd | 570 | skb_queue_tail(&dev->done, skb); |
1da177e4 LT |
571 | } |
572 | ||
573 | /*-------------------------------------------------------------------------*/ | |
574 | ||
7d12e780 | 575 | static void rx_complete (struct urb *urb) |
1da177e4 LT |
576 | { |
577 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
578 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
579 | struct usbnet *dev = entry->dev; | |
580 | int urb_status = urb->status; | |
5b6e9bcd | 581 | enum skb_state state; |
1da177e4 LT |
582 | |
583 | skb_put (skb, urb->actual_length); | |
5b6e9bcd | 584 | state = rx_done; |
1da177e4 LT |
585 | entry->urb = NULL; |
586 | ||
587 | switch (urb_status) { | |
18ab458f DB |
588 | /* success */ |
589 | case 0: | |
1da177e4 LT |
590 | break; |
591 | ||
18ab458f DB |
592 | /* stalls need manual reset. this is rare ... except that |
593 | * when going through USB 2.0 TTs, unplug appears this way. | |
3ac49a1c | 594 | * we avoid the highspeed version of the ETIMEDOUT/EILSEQ |
18ab458f DB |
595 | * storm, recovering as needed. |
596 | */ | |
597 | case -EPIPE: | |
7963837f | 598 | dev->net->stats.rx_errors++; |
2e55cc72 | 599 | usbnet_defer_kevent (dev, EVENT_RX_HALT); |
1da177e4 LT |
600 | // FALLTHROUGH |
601 | ||
18ab458f DB |
602 | /* software-driven interface shutdown */ |
603 | case -ECONNRESET: /* async unlink */ | |
604 | case -ESHUTDOWN: /* hardware gone */ | |
a475f603 JP |
605 | netif_dbg(dev, ifdown, dev->net, |
606 | "rx shutdown, code %d\n", urb_status); | |
1da177e4 LT |
607 | goto block; |
608 | ||
37ebb549 | 609 | /* we get controller i/o faults during hub_wq disconnect() delays. |
18ab458f | 610 | * throttle down resubmits, to avoid log floods; just temporarily, |
37ebb549 | 611 | * so we still recover when the fault isn't a hub_wq delay. |
18ab458f DB |
612 | */ |
613 | case -EPROTO: | |
614 | case -ETIME: | |
615 | case -EILSEQ: | |
7963837f | 616 | dev->net->stats.rx_errors++; |
1da177e4 LT |
617 | if (!timer_pending (&dev->delay)) { |
618 | mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); | |
a475f603 JP |
619 | netif_dbg(dev, link, dev->net, |
620 | "rx throttle %d\n", urb_status); | |
1da177e4 LT |
621 | } |
622 | block: | |
5b6e9bcd | 623 | state = rx_cleanup; |
1da177e4 LT |
624 | entry->urb = urb; |
625 | urb = NULL; | |
626 | break; | |
627 | ||
18ab458f DB |
628 | /* data overrun ... flush fifo? */ |
629 | case -EOVERFLOW: | |
7963837f | 630 | dev->net->stats.rx_over_errors++; |
1da177e4 | 631 | // FALLTHROUGH |
cb1cebbe | 632 | |
18ab458f | 633 | default: |
5b6e9bcd | 634 | state = rx_cleanup; |
7963837f | 635 | dev->net->stats.rx_errors++; |
a475f603 | 636 | netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); |
1da177e4 LT |
637 | break; |
638 | } | |
639 | ||
70c37bf9 BM |
640 | /* stop rx if packet error rate is high */ |
641 | if (++dev->pkt_cnt > 30) { | |
642 | dev->pkt_cnt = 0; | |
643 | dev->pkt_err = 0; | |
644 | } else { | |
645 | if (state == rx_cleanup) | |
646 | dev->pkt_err++; | |
647 | if (dev->pkt_err > 20) | |
648 | set_bit(EVENT_RX_KILL, &dev->flags); | |
649 | } | |
650 | ||
5b6e9bcd | 651 | state = defer_bh(dev, skb, &dev->rxq, state); |
1da177e4 LT |
652 | |
653 | if (urb) { | |
8e95a202 | 654 | if (netif_running (dev->net) && |
5b6e9bcd ML |
655 | !test_bit (EVENT_RX_HALT, &dev->flags) && |
656 | state != unlink_start) { | |
1da177e4 | 657 | rx_submit (dev, urb, GFP_ATOMIC); |
8a783354 | 658 | usb_mark_last_busy(dev->udev); |
1da177e4 LT |
659 | return; |
660 | } | |
661 | usb_free_urb (urb); | |
662 | } | |
a475f603 | 663 | netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); |
1da177e4 LT |
664 | } |
665 | ||
7834ddbc JK |
666 | /*-------------------------------------------------------------------------*/ |
667 | void usbnet_pause_rx(struct usbnet *dev) | |
668 | { | |
669 | set_bit(EVENT_RX_PAUSED, &dev->flags); | |
670 | ||
a475f603 | 671 | netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); |
7834ddbc JK |
672 | } |
673 | EXPORT_SYMBOL_GPL(usbnet_pause_rx); | |
674 | ||
675 | void usbnet_resume_rx(struct usbnet *dev) | |
676 | { | |
677 | struct sk_buff *skb; | |
678 | int num = 0; | |
679 | ||
680 | clear_bit(EVENT_RX_PAUSED, &dev->flags); | |
681 | ||
682 | while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { | |
683 | usbnet_skb_return(dev, skb); | |
684 | num++; | |
685 | } | |
686 | ||
687 | tasklet_schedule(&dev->bh); | |
688 | ||
a475f603 JP |
689 | netif_dbg(dev, rx_status, dev->net, |
690 | "paused rx queue disabled, %d skbs requeued\n", num); | |
7834ddbc JK |
691 | } |
692 | EXPORT_SYMBOL_GPL(usbnet_resume_rx); | |
693 | ||
694 | void usbnet_purge_paused_rxq(struct usbnet *dev) | |
695 | { | |
696 | skb_queue_purge(&dev->rxq_pause); | |
697 | } | |
698 | EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); | |
699 | ||
1da177e4 LT |
700 | /*-------------------------------------------------------------------------*/ |
701 | ||
702 | // unlink pending rx/tx; completion handlers do all other cleanup | |
703 | ||
704 | static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) | |
705 | { | |
706 | unsigned long flags; | |
5b6e9bcd | 707 | struct sk_buff *skb; |
1da177e4 LT |
708 | int count = 0; |
709 | ||
710 | spin_lock_irqsave (&q->lock, flags); | |
5b6e9bcd | 711 | while (!skb_queue_empty(q)) { |
1da177e4 LT |
712 | struct skb_data *entry; |
713 | struct urb *urb; | |
714 | int retval; | |
715 | ||
5b6e9bcd ML |
716 | skb_queue_walk(q, skb) { |
717 | entry = (struct skb_data *) skb->cb; | |
718 | if (entry->state != unlink_start) | |
719 | goto found; | |
720 | } | |
721 | break; | |
722 | found: | |
723 | entry->state = unlink_start; | |
1da177e4 | 724 | urb = entry->urb; |
1da177e4 | 725 | |
0956a8c2 | 726 | /* |
727 | * Get reference count of the URB to avoid it to be | |
728 | * freed during usb_unlink_urb, which may trigger | |
729 | * use-after-free problem inside usb_unlink_urb since | |
730 | * usb_unlink_urb is always racing with .complete | |
731 | * handler(include defer_bh). | |
732 | */ | |
733 | usb_get_urb(urb); | |
4231d47e | 734 | spin_unlock_irqrestore(&q->lock, flags); |
1da177e4 LT |
735 | // during some PM-driven resume scenarios, |
736 | // these (async) unlinks complete immediately | |
737 | retval = usb_unlink_urb (urb); | |
738 | if (retval != -EINPROGRESS && retval != 0) | |
60b86755 | 739 | netdev_dbg(dev->net, "unlink urb err, %d\n", retval); |
1da177e4 LT |
740 | else |
741 | count++; | |
0956a8c2 | 742 | usb_put_urb(urb); |
4231d47e | 743 | spin_lock_irqsave(&q->lock, flags); |
1da177e4 LT |
744 | } |
745 | spin_unlock_irqrestore (&q->lock, flags); | |
746 | return count; | |
747 | } | |
748 | ||
a99c1949 JP |
749 | // Flush all pending rx urbs |
750 | // minidrivers may need to do this when the MTU changes | |
751 | ||
752 | void usbnet_unlink_rx_urbs(struct usbnet *dev) | |
753 | { | |
754 | if (netif_running(dev->net)) { | |
755 | (void) unlink_urbs (dev, &dev->rxq); | |
756 | tasklet_schedule(&dev->bh); | |
757 | } | |
758 | } | |
759 | EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); | |
1da177e4 LT |
760 | |
761 | /*-------------------------------------------------------------------------*/ | |
762 | ||
fcb0bb6a ES |
763 | static void wait_skb_queue_empty(struct sk_buff_head *q) |
764 | { | |
765 | unsigned long flags; | |
766 | ||
767 | spin_lock_irqsave(&q->lock, flags); | |
768 | while (!skb_queue_empty(q)) { | |
769 | spin_unlock_irqrestore(&q->lock, flags); | |
770 | schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); | |
771 | set_current_state(TASK_UNINTERRUPTIBLE); | |
772 | spin_lock_irqsave(&q->lock, flags); | |
773 | } | |
774 | spin_unlock_irqrestore(&q->lock, flags); | |
775 | } | |
776 | ||
1da177e4 | 777 | // precondition: never called in_interrupt |
69ee472f ON |
778 | static void usbnet_terminate_urbs(struct usbnet *dev) |
779 | { | |
69ee472f ON |
780 | DECLARE_WAITQUEUE(wait, current); |
781 | int temp; | |
782 | ||
783 | /* ensure there are no more active urbs */ | |
14a0d635 | 784 | add_wait_queue(&dev->wait, &wait); |
69ee472f | 785 | set_current_state(TASK_UNINTERRUPTIBLE); |
69ee472f ON |
786 | temp = unlink_urbs(dev, &dev->txq) + |
787 | unlink_urbs(dev, &dev->rxq); | |
788 | ||
789 | /* maybe wait for deletions to finish. */ | |
fcb0bb6a ES |
790 | wait_skb_queue_empty(&dev->rxq); |
791 | wait_skb_queue_empty(&dev->txq); | |
792 | wait_skb_queue_empty(&dev->done); | |
793 | netif_dbg(dev, ifdown, dev->net, | |
794 | "waited for %d urb completions\n", temp); | |
69ee472f | 795 | set_current_state(TASK_RUNNING); |
14a0d635 | 796 | remove_wait_queue(&dev->wait, &wait); |
69ee472f | 797 | } |
1da177e4 | 798 | |
777baa47 | 799 | int usbnet_stop (struct net_device *net) |
1da177e4 LT |
800 | { |
801 | struct usbnet *dev = netdev_priv(net); | |
a33e9e7f | 802 | struct driver_info *info = dev->driver_info; |
f50791ac | 803 | int retval, pm, mpn; |
1da177e4 | 804 | |
75bd0cbd | 805 | clear_bit(EVENT_DEV_OPEN, &dev->flags); |
1da177e4 LT |
806 | netif_stop_queue (net); |
807 | ||
a475f603 | 808 | netif_info(dev, ifdown, dev->net, |
8ccef431 | 809 | "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", |
a475f603 JP |
810 | net->stats.rx_packets, net->stats.tx_packets, |
811 | net->stats.rx_errors, net->stats.tx_errors); | |
1da177e4 | 812 | |
14a0d635 ON |
813 | /* to not race resume */ |
814 | pm = usb_autopm_get_interface(dev->intf); | |
a33e9e7f JK |
815 | /* allow minidriver to stop correctly (wireless devices to turn off |
816 | * radio etc) */ | |
817 | if (info->stop) { | |
818 | retval = info->stop(dev); | |
a475f603 JP |
819 | if (retval < 0) |
820 | netif_info(dev, ifdown, dev->net, | |
821 | "stop fail (%d) usbnet usb-%s-%s, %s\n", | |
822 | retval, | |
823 | dev->udev->bus->bus_name, dev->udev->devpath, | |
824 | info->description); | |
a33e9e7f JK |
825 | } |
826 | ||
69ee472f ON |
827 | if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) |
828 | usbnet_terminate_urbs(dev); | |
1da177e4 | 829 | |
6eecdc5f | 830 | usbnet_status_stop(dev); |
1da177e4 | 831 | |
7834ddbc JK |
832 | usbnet_purge_paused_rxq(dev); |
833 | ||
f50791ac ES |
834 | mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); |
835 | ||
1da177e4 LT |
836 | /* deferred work (task, timer, softirq) must also stop. |
837 | * can't flush_scheduled_work() until we drop rtnl (later), | |
838 | * else workers could deadlock; so make workers a NOP. | |
839 | */ | |
840 | dev->flags = 0; | |
841 | del_timer_sync (&dev->delay); | |
842 | tasklet_kill (&dev->bh); | |
14a0d635 ON |
843 | if (!pm) |
844 | usb_autopm_put_interface(dev->intf); | |
845 | ||
f50791ac | 846 | if (info->manage_power && mpn) |
69ee472f ON |
847 | info->manage_power(dev, 0); |
848 | else | |
849 | usb_autopm_put_interface(dev->intf); | |
1da177e4 LT |
850 | |
851 | return 0; | |
852 | } | |
777baa47 | 853 | EXPORT_SYMBOL_GPL(usbnet_stop); |
1da177e4 LT |
854 | |
855 | /*-------------------------------------------------------------------------*/ | |
856 | ||
857 | // posts reads, and enables write queuing | |
858 | ||
859 | // precondition: never called in_interrupt | |
860 | ||
777baa47 | 861 | int usbnet_open (struct net_device *net) |
1da177e4 LT |
862 | { |
863 | struct usbnet *dev = netdev_priv(net); | |
a11a6544 | 864 | int retval; |
1da177e4 LT |
865 | struct driver_info *info = dev->driver_info; |
866 | ||
a11a6544 | 867 | if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { |
a475f603 JP |
868 | netif_info(dev, ifup, dev->net, |
869 | "resumption fail (%d) usbnet usb-%s-%s, %s\n", | |
870 | retval, | |
871 | dev->udev->bus->bus_name, | |
872 | dev->udev->devpath, | |
873 | info->description); | |
a11a6544 ON |
874 | goto done_nopm; |
875 | } | |
876 | ||
1da177e4 LT |
877 | // put into "known safe" state |
878 | if (info->reset && (retval = info->reset (dev)) < 0) { | |
a475f603 JP |
879 | netif_info(dev, ifup, dev->net, |
880 | "open reset fail (%d) usbnet usb-%s-%s, %s\n", | |
881 | retval, | |
882 | dev->udev->bus->bus_name, | |
883 | dev->udev->devpath, | |
884 | info->description); | |
1da177e4 LT |
885 | goto done; |
886 | } | |
887 | ||
a88c32ae ML |
888 | /* hard_mtu or rx_urb_size may change in reset() */ |
889 | usbnet_update_max_qlen(dev); | |
890 | ||
1da177e4 LT |
891 | // insist peer be connected |
892 | if (info->check_connect && (retval = info->check_connect (dev)) < 0) { | |
a475f603 | 893 | netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); |
1da177e4 LT |
894 | goto done; |
895 | } | |
896 | ||
897 | /* start any status interrupt transfer */ | |
898 | if (dev->interrupt) { | |
6eecdc5f | 899 | retval = usbnet_status_start(dev, GFP_KERNEL); |
1da177e4 | 900 | if (retval < 0) { |
a475f603 JP |
901 | netif_err(dev, ifup, dev->net, |
902 | "intr submit %d\n", retval); | |
1da177e4 LT |
903 | goto done; |
904 | } | |
905 | } | |
906 | ||
68972efa | 907 | set_bit(EVENT_DEV_OPEN, &dev->flags); |
1da177e4 | 908 | netif_start_queue (net); |
a475f603 JP |
909 | netif_info(dev, ifup, dev->net, |
910 | "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", | |
911 | (int)RX_QLEN(dev), (int)TX_QLEN(dev), | |
912 | dev->net->mtu, | |
913 | (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : | |
914 | (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : | |
915 | (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : | |
916 | (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : | |
917 | (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : | |
918 | "simple"); | |
1da177e4 | 919 | |
70c37bf9 BM |
920 | /* reset rx error state */ |
921 | dev->pkt_cnt = 0; | |
922 | dev->pkt_err = 0; | |
923 | clear_bit(EVENT_RX_KILL, &dev->flags); | |
924 | ||
1da177e4 LT |
925 | // delay posting reads until we're fully open |
926 | tasklet_schedule (&dev->bh); | |
69ee472f ON |
927 | if (info->manage_power) { |
928 | retval = info->manage_power(dev, 1); | |
a1c088e0 ON |
929 | if (retval < 0) { |
930 | retval = 0; | |
931 | set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); | |
932 | } else { | |
933 | usb_autopm_put_interface(dev->intf); | |
934 | } | |
69ee472f | 935 | } |
a11a6544 | 936 | return retval; |
1da177e4 | 937 | done: |
a11a6544 ON |
938 | usb_autopm_put_interface(dev->intf); |
939 | done_nopm: | |
1da177e4 LT |
940 | return retval; |
941 | } | |
777baa47 | 942 | EXPORT_SYMBOL_GPL(usbnet_open); |
1da177e4 LT |
943 | |
944 | /*-------------------------------------------------------------------------*/ | |
945 | ||
2e55cc72 DB |
946 | /* ethtool methods; minidrivers may need to add some more, but |
947 | * they'll probably want to use this base set. | |
948 | */ | |
949 | ||
c41286fd AB |
950 | int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) |
951 | { | |
952 | struct usbnet *dev = netdev_priv(net); | |
953 | ||
954 | if (!dev->mii.mdio_read) | |
955 | return -EOPNOTSUPP; | |
956 | ||
957 | return mii_ethtool_gset(&dev->mii, cmd); | |
958 | } | |
959 | EXPORT_SYMBOL_GPL(usbnet_get_settings); | |
960 | ||
961 | int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) | |
962 | { | |
963 | struct usbnet *dev = netdev_priv(net); | |
964 | int retval; | |
965 | ||
966 | if (!dev->mii.mdio_write) | |
967 | return -EOPNOTSUPP; | |
968 | ||
969 | retval = mii_ethtool_sset(&dev->mii, cmd); | |
970 | ||
971 | /* link speed/duplex might have changed */ | |
972 | if (dev->driver_info->link_reset) | |
973 | dev->driver_info->link_reset(dev); | |
974 | ||
a88c32ae ML |
975 | /* hard_mtu or rx_urb_size may change in link_reset() */ |
976 | usbnet_update_max_qlen(dev); | |
977 | ||
c41286fd AB |
978 | return retval; |
979 | ||
980 | } | |
981 | EXPORT_SYMBOL_GPL(usbnet_set_settings); | |
982 | ||
c41286fd | 983 | u32 usbnet_get_link (struct net_device *net) |
1da177e4 LT |
984 | { |
985 | struct usbnet *dev = netdev_priv(net); | |
986 | ||
f29fc259 | 987 | /* If a check_connect is defined, return its result */ |
1da177e4 LT |
988 | if (dev->driver_info->check_connect) |
989 | return dev->driver_info->check_connect (dev) == 0; | |
990 | ||
c41286fd AB |
991 | /* if the device has mii operations, use those */ |
992 | if (dev->mii.mdio_read) | |
993 | return mii_link_ok(&dev->mii); | |
994 | ||
05ffb3e2 BM |
995 | /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ |
996 | return ethtool_op_get_link(net); | |
1da177e4 | 997 | } |
c41286fd | 998 | EXPORT_SYMBOL_GPL(usbnet_get_link); |
1da177e4 | 999 | |
18ee91fa | 1000 | int usbnet_nway_reset(struct net_device *net) |
1da177e4 LT |
1001 | { |
1002 | struct usbnet *dev = netdev_priv(net); | |
1003 | ||
18ee91fa DB |
1004 | if (!dev->mii.mdio_write) |
1005 | return -EOPNOTSUPP; | |
1006 | ||
1007 | return mii_nway_restart(&dev->mii); | |
1da177e4 | 1008 | } |
18ee91fa | 1009 | EXPORT_SYMBOL_GPL(usbnet_nway_reset); |
1da177e4 | 1010 | |
18ee91fa | 1011 | void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) |
1da177e4 LT |
1012 | { |
1013 | struct usbnet *dev = netdev_priv(net); | |
1014 | ||
86a2f415 PS |
1015 | strlcpy (info->driver, dev->driver_name, sizeof info->driver); |
1016 | strlcpy (info->version, DRIVER_VERSION, sizeof info->version); | |
1017 | strlcpy (info->fw_version, dev->driver_info->description, | |
18ee91fa DB |
1018 | sizeof info->fw_version); |
1019 | usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); | |
1da177e4 | 1020 | } |
18ee91fa | 1021 | EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); |
1da177e4 | 1022 | |
18ee91fa | 1023 | u32 usbnet_get_msglevel (struct net_device *net) |
c41286fd AB |
1024 | { |
1025 | struct usbnet *dev = netdev_priv(net); | |
1026 | ||
18ee91fa DB |
1027 | return dev->msg_enable; |
1028 | } | |
1029 | EXPORT_SYMBOL_GPL(usbnet_get_msglevel); | |
c41286fd | 1030 | |
18ee91fa DB |
1031 | void usbnet_set_msglevel (struct net_device *net, u32 level) |
1032 | { | |
1033 | struct usbnet *dev = netdev_priv(net); | |
1034 | ||
1035 | dev->msg_enable = level; | |
c41286fd | 1036 | } |
18ee91fa | 1037 | EXPORT_SYMBOL_GPL(usbnet_set_msglevel); |
c41286fd | 1038 | |
2e55cc72 | 1039 | /* drivers may override default ethtool_ops in their bind() routine */ |
0fc0b732 | 1040 | static const struct ethtool_ops usbnet_ethtool_ops = { |
c41286fd AB |
1041 | .get_settings = usbnet_get_settings, |
1042 | .set_settings = usbnet_set_settings, | |
2e55cc72 | 1043 | .get_link = usbnet_get_link, |
c41286fd | 1044 | .nway_reset = usbnet_nway_reset, |
18ee91fa | 1045 | .get_drvinfo = usbnet_get_drvinfo, |
2e55cc72 DB |
1046 | .get_msglevel = usbnet_get_msglevel, |
1047 | .set_msglevel = usbnet_set_msglevel, | |
123edb18 | 1048 | .get_ts_info = ethtool_op_get_ts_info, |
2e55cc72 | 1049 | }; |
1da177e4 LT |
1050 | |
1051 | /*-------------------------------------------------------------------------*/ | |
1052 | ||
4b49f58f ML |
1053 | static void __handle_link_change(struct usbnet *dev) |
1054 | { | |
1055 | if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) | |
1056 | return; | |
1057 | ||
1058 | if (!netif_carrier_ok(dev->net)) { | |
1059 | /* kill URBs for reading packets to save bus bandwidth */ | |
1060 | unlink_urbs(dev, &dev->rxq); | |
1061 | ||
1062 | /* | |
1063 | * tx_timeout will unlink URBs for sending packets and | |
1064 | * tx queue is stopped by netcore after link becomes off | |
1065 | */ | |
1066 | } else { | |
1067 | /* submitting URBs for reading packets */ | |
1068 | tasklet_schedule(&dev->bh); | |
1069 | } | |
1070 | ||
a88c32ae ML |
1071 | /* hard_mtu or rx_urb_size may change during link change */ |
1072 | usbnet_update_max_qlen(dev); | |
1073 | ||
4b49f58f ML |
1074 | clear_bit(EVENT_LINK_CHANGE, &dev->flags); |
1075 | } | |
1076 | ||
1efed2d0 OB |
1077 | static void usbnet_set_rx_mode(struct net_device *net) |
1078 | { | |
1079 | struct usbnet *dev = netdev_priv(net); | |
1080 | ||
1081 | usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); | |
1082 | } | |
1083 | ||
1084 | static void __handle_set_rx_mode(struct usbnet *dev) | |
1085 | { | |
1086 | if (dev->driver_info->set_rx_mode) | |
1087 | (dev->driver_info->set_rx_mode)(dev); | |
1088 | ||
1089 | clear_bit(EVENT_SET_RX_MODE, &dev->flags); | |
1090 | } | |
1091 | ||
1da177e4 LT |
1092 | /* work that cannot be done in interrupt context uses keventd. |
1093 | * | |
1094 | * NOTE: with 2.5 we could do more of this using completion callbacks, | |
1095 | * especially now that control transfers can be queued. | |
1096 | */ | |
1097 | static void | |
11f17ef3 | 1098 | usbnet_deferred_kevent (struct work_struct *work) |
1da177e4 | 1099 | { |
c4028958 DH |
1100 | struct usbnet *dev = |
1101 | container_of(work, struct usbnet, kevent); | |
1da177e4 LT |
1102 | int status; |
1103 | ||
1104 | /* usb_clear_halt() needs a thread context */ | |
1105 | if (test_bit (EVENT_TX_HALT, &dev->flags)) { | |
1106 | unlink_urbs (dev, &dev->txq); | |
69ee472f ON |
1107 | status = usb_autopm_get_interface(dev->intf); |
1108 | if (status < 0) | |
1109 | goto fail_pipe; | |
1da177e4 | 1110 | status = usb_clear_halt (dev->udev, dev->out); |
69ee472f | 1111 | usb_autopm_put_interface(dev->intf); |
8e95a202 JP |
1112 | if (status < 0 && |
1113 | status != -EPIPE && | |
1114 | status != -ESHUTDOWN) { | |
1da177e4 | 1115 | if (netif_msg_tx_err (dev)) |
69ee472f | 1116 | fail_pipe: |
60b86755 JP |
1117 | netdev_err(dev->net, "can't clear tx halt, status %d\n", |
1118 | status); | |
1da177e4 LT |
1119 | } else { |
1120 | clear_bit (EVENT_TX_HALT, &dev->flags); | |
f29fc259 DB |
1121 | if (status != -ESHUTDOWN) |
1122 | netif_wake_queue (dev->net); | |
1da177e4 LT |
1123 | } |
1124 | } | |
1125 | if (test_bit (EVENT_RX_HALT, &dev->flags)) { | |
1126 | unlink_urbs (dev, &dev->rxq); | |
69ee472f ON |
1127 | status = usb_autopm_get_interface(dev->intf); |
1128 | if (status < 0) | |
1129 | goto fail_halt; | |
1da177e4 | 1130 | status = usb_clear_halt (dev->udev, dev->in); |
69ee472f | 1131 | usb_autopm_put_interface(dev->intf); |
8e95a202 JP |
1132 | if (status < 0 && |
1133 | status != -EPIPE && | |
1134 | status != -ESHUTDOWN) { | |
1da177e4 | 1135 | if (netif_msg_rx_err (dev)) |
69ee472f | 1136 | fail_halt: |
60b86755 JP |
1137 | netdev_err(dev->net, "can't clear rx halt, status %d\n", |
1138 | status); | |
1da177e4 LT |
1139 | } else { |
1140 | clear_bit (EVENT_RX_HALT, &dev->flags); | |
1141 | tasklet_schedule (&dev->bh); | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | /* tasklet could resubmit itself forever if memory is tight */ | |
1146 | if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { | |
1147 | struct urb *urb = NULL; | |
dacb3975 | 1148 | int resched = 1; |
1da177e4 LT |
1149 | |
1150 | if (netif_running (dev->net)) | |
1151 | urb = usb_alloc_urb (0, GFP_KERNEL); | |
1152 | else | |
1153 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
1154 | if (urb != NULL) { | |
1155 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
69ee472f | 1156 | status = usb_autopm_get_interface(dev->intf); |
ab60707f JJ |
1157 | if (status < 0) { |
1158 | usb_free_urb(urb); | |
69ee472f | 1159 | goto fail_lowmem; |
ab60707f | 1160 | } |
dacb3975 DM |
1161 | if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) |
1162 | resched = 0; | |
69ee472f ON |
1163 | usb_autopm_put_interface(dev->intf); |
1164 | fail_lowmem: | |
dacb3975 DM |
1165 | if (resched) |
1166 | tasklet_schedule (&dev->bh); | |
1da177e4 LT |
1167 | } |
1168 | } | |
1169 | ||
7ea13c9c | 1170 | if (test_bit (EVENT_LINK_RESET, &dev->flags)) { |
cb1cebbe | 1171 | struct driver_info *info = dev->driver_info; |
7ea13c9c DH |
1172 | int retval = 0; |
1173 | ||
1174 | clear_bit (EVENT_LINK_RESET, &dev->flags); | |
69ee472f ON |
1175 | status = usb_autopm_get_interface(dev->intf); |
1176 | if (status < 0) | |
1177 | goto skip_reset; | |
7ea13c9c | 1178 | if(info->link_reset && (retval = info->link_reset(dev)) < 0) { |
69ee472f ON |
1179 | usb_autopm_put_interface(dev->intf); |
1180 | skip_reset: | |
60b86755 JP |
1181 | netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", |
1182 | retval, | |
1183 | dev->udev->bus->bus_name, | |
1184 | dev->udev->devpath, | |
1185 | info->description); | |
69ee472f ON |
1186 | } else { |
1187 | usb_autopm_put_interface(dev->intf); | |
7ea13c9c | 1188 | } |
4b49f58f ML |
1189 | |
1190 | /* handle link change from link resetting */ | |
1191 | __handle_link_change(dev); | |
7ea13c9c DH |
1192 | } |
1193 | ||
4b49f58f ML |
1194 | if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) |
1195 | __handle_link_change(dev); | |
1196 | ||
1efed2d0 OB |
1197 | if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) |
1198 | __handle_set_rx_mode(dev); | |
1199 | ||
1200 | ||
1da177e4 | 1201 | if (dev->flags) |
60b86755 | 1202 | netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); |
1da177e4 LT |
1203 | } |
1204 | ||
1205 | /*-------------------------------------------------------------------------*/ | |
1206 | ||
7d12e780 | 1207 | static void tx_complete (struct urb *urb) |
1da177e4 LT |
1208 | { |
1209 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
1210 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
1211 | struct usbnet *dev = entry->dev; | |
1212 | ||
1213 | if (urb->status == 0) { | |
1e9e39f4 | 1214 | dev->net->stats.tx_packets += entry->packets; |
7963837f | 1215 | dev->net->stats.tx_bytes += entry->length; |
1da177e4 | 1216 | } else { |
7963837f | 1217 | dev->net->stats.tx_errors++; |
1da177e4 LT |
1218 | |
1219 | switch (urb->status) { | |
1220 | case -EPIPE: | |
2e55cc72 | 1221 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
1da177e4 LT |
1222 | break; |
1223 | ||
1224 | /* software-driven interface shutdown */ | |
1225 | case -ECONNRESET: // async unlink | |
1226 | case -ESHUTDOWN: // hardware gone | |
1227 | break; | |
1228 | ||
37ebb549 PM |
1229 | /* like rx, tx gets controller i/o faults during hub_wq |
1230 | * delays and so it uses the same throttling mechanism. | |
1231 | */ | |
38e2bfc9 PZ |
1232 | case -EPROTO: |
1233 | case -ETIME: | |
1234 | case -EILSEQ: | |
69ee472f | 1235 | usb_mark_last_busy(dev->udev); |
1da177e4 LT |
1236 | if (!timer_pending (&dev->delay)) { |
1237 | mod_timer (&dev->delay, | |
1238 | jiffies + THROTTLE_JIFFIES); | |
a475f603 JP |
1239 | netif_dbg(dev, link, dev->net, |
1240 | "tx throttle %d\n", urb->status); | |
1da177e4 LT |
1241 | } |
1242 | netif_stop_queue (dev->net); | |
1243 | break; | |
1244 | default: | |
a475f603 JP |
1245 | netif_dbg(dev, tx_err, dev->net, |
1246 | "tx err %d\n", entry->urb->status); | |
1da177e4 LT |
1247 | break; |
1248 | } | |
1249 | } | |
1250 | ||
69ee472f | 1251 | usb_autopm_put_interface_async(dev->intf); |
5b6e9bcd | 1252 | (void) defer_bh(dev, skb, &dev->txq, tx_done); |
1da177e4 LT |
1253 | } |
1254 | ||
1255 | /*-------------------------------------------------------------------------*/ | |
1256 | ||
777baa47 | 1257 | void usbnet_tx_timeout (struct net_device *net) |
1da177e4 LT |
1258 | { |
1259 | struct usbnet *dev = netdev_priv(net); | |
1260 | ||
1261 | unlink_urbs (dev, &dev->txq); | |
1262 | tasklet_schedule (&dev->bh); | |
dbcdd4d5 ON |
1263 | /* this needs to be handled individually because the generic layer |
1264 | * doesn't know what is sufficient and could not restore private | |
1265 | * information if a remedy of an unconditional reset were used. | |
1266 | */ | |
1267 | if (dev->driver_info->recover) | |
1268 | (dev->driver_info->recover)(dev); | |
1da177e4 | 1269 | } |
777baa47 | 1270 | EXPORT_SYMBOL_GPL(usbnet_tx_timeout); |
1da177e4 LT |
1271 | |
1272 | /*-------------------------------------------------------------------------*/ | |
1273 | ||
638c5115 ML |
1274 | static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) |
1275 | { | |
1276 | unsigned num_sgs, total_len = 0; | |
1277 | int i, s = 0; | |
1278 | ||
1279 | num_sgs = skb_shinfo(skb)->nr_frags + 1; | |
1280 | if (num_sgs == 1) | |
1281 | return 0; | |
1282 | ||
60e453a9 ML |
1283 | /* reserve one for zero packet */ |
1284 | urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), | |
1285 | GFP_ATOMIC); | |
638c5115 ML |
1286 | if (!urb->sg) |
1287 | return -ENOMEM; | |
1288 | ||
1289 | urb->num_sgs = num_sgs; | |
fdc3452c | 1290 | sg_init_table(urb->sg, urb->num_sgs + 1); |
638c5115 ML |
1291 | |
1292 | sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); | |
1293 | total_len += skb_headlen(skb); | |
1294 | ||
1295 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1296 | struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; | |
1297 | ||
1298 | total_len += skb_frag_size(f); | |
1299 | sg_set_page(&urb->sg[i + s], f->page.p, f->size, | |
1300 | f->page_offset); | |
1301 | } | |
1302 | urb->transfer_buffer_length = total_len; | |
1303 | ||
1304 | return 1; | |
1305 | } | |
1306 | ||
25a79c41 SH |
1307 | netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, |
1308 | struct net_device *net) | |
1da177e4 LT |
1309 | { |
1310 | struct usbnet *dev = netdev_priv(net); | |
3e4336a6 | 1311 | unsigned int length; |
1da177e4 LT |
1312 | struct urb *urb = NULL; |
1313 | struct skb_data *entry; | |
1314 | struct driver_info *info = dev->driver_info; | |
1315 | unsigned long flags; | |
25a79c41 | 1316 | int retval; |
1da177e4 | 1317 | |
23ba0799 KK |
1318 | if (skb) |
1319 | skb_tx_timestamp(skb); | |
f9b491ec | 1320 | |
1da177e4 LT |
1321 | // some devices want funky USB-level framing, for |
1322 | // win32 driver (usually) and/or hardware quirks | |
1323 | if (info->tx_fixup) { | |
1324 | skb = info->tx_fixup (dev, skb, GFP_ATOMIC); | |
1325 | if (!skb) { | |
bf414b36 BM |
1326 | /* packet collected; minidriver waiting for more */ |
1327 | if (info->flags & FLAG_MULTI_PACKET) | |
073285fd | 1328 | goto not_drop; |
bf414b36 BM |
1329 | netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); |
1330 | goto drop; | |
1da177e4 LT |
1331 | } |
1332 | } | |
1da177e4 LT |
1333 | |
1334 | if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { | |
a475f603 | 1335 | netif_dbg(dev, tx_err, dev->net, "no urb\n"); |
1da177e4 LT |
1336 | goto drop; |
1337 | } | |
1338 | ||
1339 | entry = (struct skb_data *) skb->cb; | |
1340 | entry->urb = urb; | |
1341 | entry->dev = dev; | |
1da177e4 | 1342 | |
1da177e4 LT |
1343 | usb_fill_bulk_urb (urb, dev->udev, dev->out, |
1344 | skb->data, skb->len, tx_complete, skb); | |
638c5115 ML |
1345 | if (dev->can_dma_sg) { |
1346 | if (build_dma_sg(skb, urb) < 0) | |
1347 | goto drop; | |
1348 | } | |
60e453a9 | 1349 | length = urb->transfer_buffer_length; |
1da177e4 LT |
1350 | |
1351 | /* don't assume the hardware handles USB_ZERO_PACKET | |
1352 | * NOTE: strictly conforming cdc-ether devices should expect | |
1353 | * the ZLP here, but ignore the one-byte packet. | |
073285fd AO |
1354 | * NOTE2: CDC NCM specification is different from CDC ECM when |
1355 | * handling ZLP/short packets, so cdc_ncm driver will make short | |
1356 | * packet itself if needed. | |
1da177e4 | 1357 | */ |
b4d562e3 EP |
1358 | if (length % dev->maxpacket == 0) { |
1359 | if (!(info->flags & FLAG_SEND_ZLP)) { | |
073285fd | 1360 | if (!(info->flags & FLAG_MULTI_PACKET)) { |
60e453a9 ML |
1361 | length++; |
1362 | if (skb_tailroom(skb) && !urb->num_sgs) { | |
073285fd AO |
1363 | skb->data[skb->len] = 0; |
1364 | __skb_put(skb, 1); | |
60e453a9 ML |
1365 | } else if (urb->num_sgs) |
1366 | sg_set_buf(&urb->sg[urb->num_sgs++], | |
1367 | dev->padding_pkt, 1); | |
b4d562e3 EP |
1368 | } |
1369 | } else | |
1370 | urb->transfer_flags |= URB_ZERO_PACKET; | |
3e323f3e | 1371 | } |
7a1e890e BH |
1372 | urb->transfer_buffer_length = length; |
1373 | ||
1374 | if (info->flags & FLAG_MULTI_PACKET) { | |
1375 | /* Driver has set number of packets and a length delta. | |
1376 | * Calculate the complete length and ensure that it's | |
1377 | * positive. | |
1378 | */ | |
1379 | entry->length += length; | |
1380 | if (WARN_ON_ONCE(entry->length <= 0)) | |
1381 | entry->length = length; | |
1382 | } else { | |
1383 | usbnet_set_skb_tx_stats(skb, 1, length); | |
1384 | } | |
1da177e4 | 1385 | |
69ee472f ON |
1386 | spin_lock_irqsave(&dev->txq.lock, flags); |
1387 | retval = usb_autopm_get_interface_async(dev->intf); | |
1388 | if (retval < 0) { | |
1389 | spin_unlock_irqrestore(&dev->txq.lock, flags); | |
1390 | goto drop; | |
1391 | } | |
1392 | ||
1393 | #ifdef CONFIG_PM | |
1394 | /* if this triggers the device is still a sleep */ | |
1395 | if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { | |
1396 | /* transmission will be done in resume */ | |
1397 | usb_anchor_urb(urb, &dev->deferred); | |
1398 | /* no use to process more packets */ | |
1399 | netif_stop_queue(net); | |
39707c2a | 1400 | usb_put_urb(urb); |
69ee472f | 1401 | spin_unlock_irqrestore(&dev->txq.lock, flags); |
60b86755 | 1402 | netdev_dbg(dev->net, "Delaying transmission for resumption\n"); |
69ee472f ON |
1403 | goto deferred; |
1404 | } | |
1405 | #endif | |
1da177e4 | 1406 | |
1da177e4 LT |
1407 | switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { |
1408 | case -EPIPE: | |
1409 | netif_stop_queue (net); | |
2e55cc72 | 1410 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
69ee472f | 1411 | usb_autopm_put_interface_async(dev->intf); |
1da177e4 LT |
1412 | break; |
1413 | default: | |
69ee472f | 1414 | usb_autopm_put_interface_async(dev->intf); |
a475f603 JP |
1415 | netif_dbg(dev, tx_err, dev->net, |
1416 | "tx: submit urb err %d\n", retval); | |
1da177e4 LT |
1417 | break; |
1418 | case 0: | |
860e9538 | 1419 | netif_trans_update(net); |
5b6e9bcd | 1420 | __usbnet_queue_skb(&dev->txq, skb, tx_start); |
1da177e4 LT |
1421 | if (dev->txq.qlen >= TX_QLEN (dev)) |
1422 | netif_stop_queue (net); | |
1423 | } | |
1424 | spin_unlock_irqrestore (&dev->txq.lock, flags); | |
1425 | ||
1426 | if (retval) { | |
a475f603 | 1427 | netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); |
1da177e4 | 1428 | drop: |
7963837f | 1429 | dev->net->stats.tx_dropped++; |
073285fd | 1430 | not_drop: |
1da177e4 LT |
1431 | if (skb) |
1432 | dev_kfree_skb_any (skb); | |
638c5115 ML |
1433 | if (urb) { |
1434 | kfree(urb->sg); | |
1435 | usb_free_urb(urb); | |
1436 | } | |
a475f603 JP |
1437 | } else |
1438 | netif_dbg(dev, tx_queued, dev->net, | |
3e4336a6 | 1439 | "> tx, len %u, type 0x%x\n", length, skb->protocol); |
69ee472f ON |
1440 | #ifdef CONFIG_PM |
1441 | deferred: | |
1442 | #endif | |
25a79c41 | 1443 | return NETDEV_TX_OK; |
1da177e4 | 1444 | } |
777baa47 | 1445 | EXPORT_SYMBOL_GPL(usbnet_start_xmit); |
1da177e4 | 1446 | |
85e87870 | 1447 | static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) |
65841fd5 ML |
1448 | { |
1449 | struct urb *urb; | |
1450 | int i; | |
85e87870 | 1451 | int ret = 0; |
65841fd5 ML |
1452 | |
1453 | /* don't refill the queue all at once */ | |
1454 | for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { | |
1455 | urb = usb_alloc_urb(0, flags); | |
1456 | if (urb != NULL) { | |
85e87870 BM |
1457 | ret = rx_submit(dev, urb, flags); |
1458 | if (ret) | |
1459 | goto err; | |
1460 | } else { | |
1461 | ret = -ENOMEM; | |
1462 | goto err; | |
65841fd5 ML |
1463 | } |
1464 | } | |
85e87870 BM |
1465 | err: |
1466 | return ret; | |
65841fd5 ML |
1467 | } |
1468 | ||
1da177e4 LT |
1469 | /*-------------------------------------------------------------------------*/ |
1470 | ||
1471 | // tasklet (work deferred from completions, in_irq) or timer | |
1472 | ||
1473 | static void usbnet_bh (unsigned long param) | |
1474 | { | |
1475 | struct usbnet *dev = (struct usbnet *) param; | |
1476 | struct sk_buff *skb; | |
1477 | struct skb_data *entry; | |
1478 | ||
1479 | while ((skb = skb_dequeue (&dev->done))) { | |
1480 | entry = (struct skb_data *) skb->cb; | |
1481 | switch (entry->state) { | |
18ab458f | 1482 | case rx_done: |
1da177e4 LT |
1483 | entry->state = rx_cleanup; |
1484 | rx_process (dev, skb); | |
1485 | continue; | |
18ab458f | 1486 | case tx_done: |
638c5115 | 1487 | kfree(entry->urb->sg); |
18ab458f | 1488 | case rx_cleanup: |
1da177e4 LT |
1489 | usb_free_urb (entry->urb); |
1490 | dev_kfree_skb (skb); | |
1491 | continue; | |
18ab458f | 1492 | default: |
60b86755 | 1493 | netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); |
1da177e4 LT |
1494 | } |
1495 | } | |
1496 | ||
70c37bf9 BM |
1497 | /* restart RX again after disabling due to high error rate */ |
1498 | clear_bit(EVENT_RX_KILL, &dev->flags); | |
1499 | ||
14a0d635 ON |
1500 | /* waiting for all pending urbs to complete? |
1501 | * only then can we forgo submitting anew | |
1502 | */ | |
1503 | if (waitqueue_active(&dev->wait)) { | |
1504 | if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) | |
1505 | wake_up_all(&dev->wait); | |
1da177e4 LT |
1506 | |
1507 | // or are we maybe short a few urbs? | |
8e95a202 JP |
1508 | } else if (netif_running (dev->net) && |
1509 | netif_device_present (dev->net) && | |
4b49f58f | 1510 | netif_carrier_ok(dev->net) && |
43daa96b SL |
1511 | !timer_pending(&dev->delay) && |
1512 | !test_bit(EVENT_RX_PAUSED, &dev->flags) && | |
1513 | !test_bit(EVENT_RX_HALT, &dev->flags)) { | |
1da177e4 | 1514 | int temp = dev->rxq.qlen; |
65841fd5 ML |
1515 | |
1516 | if (temp < RX_QLEN(dev)) { | |
85e87870 BM |
1517 | if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) |
1518 | return; | |
a475f603 JP |
1519 | if (temp != dev->rxq.qlen) |
1520 | netif_dbg(dev, link, dev->net, | |
1521 | "rxqlen %d --> %d\n", | |
1522 | temp, dev->rxq.qlen); | |
65841fd5 | 1523 | if (dev->rxq.qlen < RX_QLEN(dev)) |
1da177e4 LT |
1524 | tasklet_schedule (&dev->bh); |
1525 | } | |
1526 | if (dev->txq.qlen < TX_QLEN (dev)) | |
1527 | netif_wake_queue (dev->net); | |
1528 | } | |
1529 | } | |
1530 | ||
1531 | ||
1da177e4 LT |
1532 | /*------------------------------------------------------------------------- |
1533 | * | |
1534 | * USB Device Driver support | |
1535 | * | |
1536 | *-------------------------------------------------------------------------*/ | |
cb1cebbe | 1537 | |
1da177e4 LT |
1538 | // precondition: never called in_interrupt |
1539 | ||
38bde1d4 | 1540 | void usbnet_disconnect (struct usb_interface *intf) |
1da177e4 LT |
1541 | { |
1542 | struct usbnet *dev; | |
1543 | struct usb_device *xdev; | |
1544 | struct net_device *net; | |
1545 | ||
1546 | dev = usb_get_intfdata(intf); | |
1547 | usb_set_intfdata(intf, NULL); | |
1548 | if (!dev) | |
1549 | return; | |
1550 | ||
1551 | xdev = interface_to_usbdev (intf); | |
1552 | ||
a475f603 JP |
1553 | netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", |
1554 | intf->dev.driver->name, | |
1555 | xdev->bus->bus_name, xdev->devpath, | |
1556 | dev->driver_info->description); | |
cb1cebbe | 1557 | |
1da177e4 LT |
1558 | net = dev->net; |
1559 | unregister_netdev (net); | |
1560 | ||
23f333a2 | 1561 | cancel_work_sync(&dev->kevent); |
1da177e4 | 1562 | |
39707c2a HK |
1563 | usb_scuttle_anchored_urbs(&dev->deferred); |
1564 | ||
1da177e4 LT |
1565 | if (dev->driver_info->unbind) |
1566 | dev->driver_info->unbind (dev, intf); | |
1567 | ||
68972efa PS |
1568 | usb_kill_urb(dev->interrupt); |
1569 | usb_free_urb(dev->interrupt); | |
60e453a9 | 1570 | kfree(dev->padding_pkt); |
68972efa | 1571 | |
1da177e4 | 1572 | free_netdev(net); |
1da177e4 | 1573 | } |
38bde1d4 | 1574 | EXPORT_SYMBOL_GPL(usbnet_disconnect); |
1da177e4 | 1575 | |
777baa47 SH |
1576 | static const struct net_device_ops usbnet_netdev_ops = { |
1577 | .ndo_open = usbnet_open, | |
1578 | .ndo_stop = usbnet_stop, | |
1579 | .ndo_start_xmit = usbnet_start_xmit, | |
1580 | .ndo_tx_timeout = usbnet_tx_timeout, | |
1efed2d0 | 1581 | .ndo_set_rx_mode = usbnet_set_rx_mode, |
777baa47 SH |
1582 | .ndo_change_mtu = usbnet_change_mtu, |
1583 | .ndo_set_mac_address = eth_mac_addr, | |
1584 | .ndo_validate_addr = eth_validate_addr, | |
1585 | }; | |
1da177e4 LT |
1586 | |
1587 | /*-------------------------------------------------------------------------*/ | |
1588 | ||
1da177e4 LT |
1589 | // precondition: never called in_interrupt |
1590 | ||
225794f8 MH |
1591 | static struct device_type wlan_type = { |
1592 | .name = "wlan", | |
1593 | }; | |
1594 | ||
1595 | static struct device_type wwan_type = { | |
1596 | .name = "wwan", | |
1597 | }; | |
1598 | ||
38bde1d4 | 1599 | int |
1da177e4 LT |
1600 | usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) |
1601 | { | |
1602 | struct usbnet *dev; | |
cb1cebbe | 1603 | struct net_device *net; |
1da177e4 LT |
1604 | struct usb_host_interface *interface; |
1605 | struct driver_info *info; | |
1606 | struct usb_device *xdev; | |
1607 | int status; | |
296c0242 | 1608 | const char *name; |
b0786b43 ML |
1609 | struct usb_driver *driver = to_usb_driver(udev->dev.driver); |
1610 | ||
1611 | /* usbnet already took usb runtime pm, so have to enable the feature | |
1612 | * for usb interface, otherwise usb_autopm_get_interface may return | |
98f541c6 | 1613 | * failure if RUNTIME_PM is enabled. |
b0786b43 ML |
1614 | */ |
1615 | if (!driver->supports_autosuspend) { | |
1616 | driver->supports_autosuspend = 1; | |
1617 | pm_runtime_enable(&udev->dev); | |
1618 | } | |
1da177e4 | 1619 | |
296c0242 | 1620 | name = udev->dev.driver->name; |
1da177e4 LT |
1621 | info = (struct driver_info *) prod->driver_info; |
1622 | if (!info) { | |
296c0242 | 1623 | dev_dbg (&udev->dev, "blacklisted by %s\n", name); |
1da177e4 LT |
1624 | return -ENODEV; |
1625 | } | |
1626 | xdev = interface_to_usbdev (udev); | |
1627 | interface = udev->cur_altsetting; | |
1628 | ||
1da177e4 LT |
1629 | status = -ENOMEM; |
1630 | ||
1631 | // set up our own records | |
1632 | net = alloc_etherdev(sizeof(*dev)); | |
41de8d4c | 1633 | if (!net) |
1da177e4 | 1634 | goto out; |
1da177e4 | 1635 | |
0dacca73 BH |
1636 | /* netdev_printk() needs this so do it as early as possible */ |
1637 | SET_NETDEV_DEV(net, &udev->dev); | |
1638 | ||
1da177e4 LT |
1639 | dev = netdev_priv(net); |
1640 | dev->udev = xdev; | |
a11a6544 | 1641 | dev->intf = udev; |
1da177e4 | 1642 | dev->driver_info = info; |
296c0242 | 1643 | dev->driver_name = name; |
1da177e4 LT |
1644 | dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV |
1645 | | NETIF_MSG_PROBE | NETIF_MSG_LINK); | |
14a0d635 | 1646 | init_waitqueue_head(&dev->wait); |
1da177e4 LT |
1647 | skb_queue_head_init (&dev->rxq); |
1648 | skb_queue_head_init (&dev->txq); | |
1649 | skb_queue_head_init (&dev->done); | |
7834ddbc | 1650 | skb_queue_head_init(&dev->rxq_pause); |
1da177e4 LT |
1651 | dev->bh.func = usbnet_bh; |
1652 | dev->bh.data = (unsigned long) dev; | |
11f17ef3 | 1653 | INIT_WORK (&dev->kevent, usbnet_deferred_kevent); |
69ee472f | 1654 | init_usb_anchor(&dev->deferred); |
1da177e4 LT |
1655 | dev->delay.function = usbnet_bh; |
1656 | dev->delay.data = (unsigned long) dev; | |
1657 | init_timer (&dev->delay); | |
a9fc6338 | 1658 | mutex_init (&dev->phy_mutex); |
6eecdc5f DW |
1659 | mutex_init(&dev->interrupt_mutex); |
1660 | dev->interrupt_count = 0; | |
1da177e4 | 1661 | |
1da177e4 LT |
1662 | dev->net = net; |
1663 | strcpy (net->name, "usb%d"); | |
1664 | memcpy (net->dev_addr, node_id, sizeof node_id); | |
1665 | ||
2e55cc72 DB |
1666 | /* rx and tx sides can use different message sizes; |
1667 | * bind() should set rx_urb_size in that case. | |
1668 | */ | |
1669 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
f77f0aee JW |
1670 | net->min_mtu = 0; |
1671 | net->max_mtu = ETH_MAX_MTU; | |
1da177e4 | 1672 | |
777baa47 | 1673 | net->netdev_ops = &usbnet_netdev_ops; |
777baa47 | 1674 | net->watchdog_timeo = TX_TIMEOUT_JIFFIES; |
1da177e4 LT |
1675 | net->ethtool_ops = &usbnet_ethtool_ops; |
1676 | ||
1677 | // allow device-specific bind/init procedures | |
1678 | // NOTE net->name still not usable ... | |
1679 | if (info->bind) { | |
1680 | status = info->bind (dev, udev); | |
cb1cebbe DB |
1681 | if (status < 0) |
1682 | goto out1; | |
1683 | ||
1da177e4 LT |
1684 | // heuristic: "usb%d" for links we know are two-host, |
1685 | // else "eth%d" when there's reasonable doubt. userspace | |
1686 | // can rename the link if it knows better. | |
8e95a202 | 1687 | if ((dev->driver_info->flags & FLAG_ETHER) != 0 && |
c261344d AB |
1688 | ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || |
1689 | (net->dev_addr [0] & 0x02) == 0)) | |
1da177e4 | 1690 | strcpy (net->name, "eth%d"); |
6e3bbcc5 JK |
1691 | /* WLAN devices should always be named "wlan%d" */ |
1692 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) | |
1693 | strcpy(net->name, "wlan%d"); | |
e1e499ee MH |
1694 | /* WWAN devices should always be named "wwan%d" */ |
1695 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) | |
1696 | strcpy(net->name, "wwan%d"); | |
f29fc259 | 1697 | |
6509141f WS |
1698 | /* devices that cannot do ARP */ |
1699 | if ((dev->driver_info->flags & FLAG_NOARP) != 0) | |
1700 | net->flags |= IFF_NOARP; | |
1701 | ||
f29fc259 DB |
1702 | /* maybe the remote can't receive an Ethernet MTU */ |
1703 | if (net->mtu > (dev->hard_mtu - net->hard_header_len)) | |
1704 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
2e55cc72 DB |
1705 | } else if (!info->in || !info->out) |
1706 | status = usbnet_get_endpoints (dev, udev); | |
1da177e4 LT |
1707 | else { |
1708 | dev->in = usb_rcvbulkpipe (xdev, info->in); | |
1709 | dev->out = usb_sndbulkpipe (xdev, info->out); | |
1710 | if (!(info->flags & FLAG_NO_SETINT)) | |
1711 | status = usb_set_interface (xdev, | |
1712 | interface->desc.bInterfaceNumber, | |
1713 | interface->desc.bAlternateSetting); | |
1714 | else | |
1715 | status = 0; | |
1716 | ||
1717 | } | |
9514bfe5 | 1718 | if (status >= 0 && dev->status) |
1da177e4 LT |
1719 | status = init_status (dev, udev); |
1720 | if (status < 0) | |
cb1cebbe | 1721 | goto out3; |
1da177e4 | 1722 | |
2e55cc72 DB |
1723 | if (!dev->rx_urb_size) |
1724 | dev->rx_urb_size = dev->hard_mtu; | |
1da177e4 | 1725 | dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); |
cb1cebbe | 1726 | |
eef23b53 BM |
1727 | /* let userspace know we have a random address */ |
1728 | if (ether_addr_equal(net->dev_addr, node_id)) | |
1729 | net->addr_assign_type = NET_ADDR_RANDOM; | |
1730 | ||
225794f8 MH |
1731 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) |
1732 | SET_NETDEV_DEVTYPE(net, &wlan_type); | |
1733 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) | |
1734 | SET_NETDEV_DEVTYPE(net, &wwan_type); | |
1735 | ||
a88c32ae ML |
1736 | /* initialize max rx_qlen and tx_qlen */ |
1737 | usbnet_update_max_qlen(dev); | |
1738 | ||
60e453a9 ML |
1739 | if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && |
1740 | !(info->flags & FLAG_MULTI_PACKET)) { | |
1741 | dev->padding_pkt = kzalloc(1, GFP_KERNEL); | |
09b69024 WY |
1742 | if (!dev->padding_pkt) { |
1743 | status = -ENOMEM; | |
60e453a9 | 1744 | goto out4; |
09b69024 | 1745 | } |
60e453a9 ML |
1746 | } |
1747 | ||
1da177e4 LT |
1748 | status = register_netdev (net); |
1749 | if (status) | |
60e453a9 | 1750 | goto out5; |
a475f603 JP |
1751 | netif_info(dev, probe, dev->net, |
1752 | "register '%s' at usb-%s-%s, %s, %pM\n", | |
1753 | udev->dev.driver->name, | |
1754 | xdev->bus->bus_name, xdev->devpath, | |
1755 | dev->driver_info->description, | |
1756 | net->dev_addr); | |
1da177e4 LT |
1757 | |
1758 | // ok, it's ready to go. | |
1759 | usb_set_intfdata (udev, dev); | |
1760 | ||
1da177e4 LT |
1761 | netif_device_attach (net); |
1762 | ||
37e8273c | 1763 | if (dev->driver_info->flags & FLAG_LINK_INTR) |
0162c554 | 1764 | usbnet_link_change(dev, 0, 0); |
37e8273c | 1765 | |
1da177e4 LT |
1766 | return 0; |
1767 | ||
60e453a9 ML |
1768 | out5: |
1769 | kfree(dev->padding_pkt); | |
a4723848 | 1770 | out4: |
1771 | usb_free_urb(dev->interrupt); | |
1da177e4 LT |
1772 | out3: |
1773 | if (info->unbind) | |
1774 | info->unbind (dev, udev); | |
1775 | out1: | |
1666984c ON |
1776 | /* subdrivers must undo all they did in bind() if they |
1777 | * fail it, but we may fail later and a deferred kevent | |
1778 | * may trigger an error resubmitting itself and, worse, | |
1779 | * schedule a timer. So we kill it all just in case. | |
1780 | */ | |
1781 | cancel_work_sync(&dev->kevent); | |
1782 | del_timer_sync(&dev->delay); | |
1da177e4 LT |
1783 | free_netdev(net); |
1784 | out: | |
1da177e4 LT |
1785 | return status; |
1786 | } | |
38bde1d4 | 1787 | EXPORT_SYMBOL_GPL(usbnet_probe); |
1da177e4 LT |
1788 | |
1789 | /*-------------------------------------------------------------------------*/ | |
1790 | ||
36433127 ON |
1791 | /* |
1792 | * suspend the whole driver as soon as the first interface is suspended | |
1793 | * resume only when the last interface is resumed | |
38bde1d4 | 1794 | */ |
1da177e4 | 1795 | |
38bde1d4 | 1796 | int usbnet_suspend (struct usb_interface *intf, pm_message_t message) |
1da177e4 LT |
1797 | { |
1798 | struct usbnet *dev = usb_get_intfdata(intf); | |
cb1cebbe | 1799 | |
36433127 | 1800 | if (!dev->suspend_count++) { |
69ee472f ON |
1801 | spin_lock_irq(&dev->txq.lock); |
1802 | /* don't autosuspend while transmitting */ | |
5b1b0b81 | 1803 | if (dev->txq.qlen && PMSG_IS_AUTO(message)) { |
5eeb3132 | 1804 | dev->suspend_count--; |
69ee472f ON |
1805 | spin_unlock_irq(&dev->txq.lock); |
1806 | return -EBUSY; | |
1807 | } else { | |
1808 | set_bit(EVENT_DEV_ASLEEP, &dev->flags); | |
1809 | spin_unlock_irq(&dev->txq.lock); | |
1810 | } | |
a11a6544 ON |
1811 | /* |
1812 | * accelerate emptying of the rx and queues, to avoid | |
36433127 ON |
1813 | * having everything error out. |
1814 | */ | |
1815 | netif_device_detach (dev->net); | |
69ee472f | 1816 | usbnet_terminate_urbs(dev); |
6eecdc5f | 1817 | __usbnet_status_stop_force(dev); |
69ee472f | 1818 | |
a11a6544 ON |
1819 | /* |
1820 | * reattach so runtime management can use and | |
1821 | * wake the device | |
1822 | */ | |
1823 | netif_device_attach (dev->net); | |
36433127 | 1824 | } |
1da177e4 LT |
1825 | return 0; |
1826 | } | |
38bde1d4 | 1827 | EXPORT_SYMBOL_GPL(usbnet_suspend); |
1da177e4 | 1828 | |
38bde1d4 | 1829 | int usbnet_resume (struct usb_interface *intf) |
1da177e4 LT |
1830 | { |
1831 | struct usbnet *dev = usb_get_intfdata(intf); | |
69ee472f ON |
1832 | struct sk_buff *skb; |
1833 | struct urb *res; | |
1834 | int retval; | |
1835 | ||
1836 | if (!--dev->suspend_count) { | |
6eecdc5f DW |
1837 | /* resume interrupt URB if it was previously submitted */ |
1838 | __usbnet_status_start_force(dev, GFP_NOIO); | |
68972efa | 1839 | |
69ee472f ON |
1840 | spin_lock_irq(&dev->txq.lock); |
1841 | while ((res = usb_get_from_anchor(&dev->deferred))) { | |
1842 | ||
69ee472f ON |
1843 | skb = (struct sk_buff *)res->context; |
1844 | retval = usb_submit_urb(res, GFP_ATOMIC); | |
1845 | if (retval < 0) { | |
1846 | dev_kfree_skb_any(skb); | |
638c5115 | 1847 | kfree(res->sg); |
69ee472f ON |
1848 | usb_free_urb(res); |
1849 | usb_autopm_put_interface_async(dev->intf); | |
1850 | } else { | |
860e9538 | 1851 | netif_trans_update(dev->net); |
69ee472f ON |
1852 | __skb_queue_tail(&dev->txq, skb); |
1853 | } | |
1854 | } | |
1da177e4 | 1855 | |
69ee472f ON |
1856 | smp_mb(); |
1857 | clear_bit(EVENT_DEV_ASLEEP, &dev->flags); | |
1858 | spin_unlock_irq(&dev->txq.lock); | |
75bd0cbd ML |
1859 | |
1860 | if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { | |
14a0d635 ON |
1861 | /* handle remote wakeup ASAP |
1862 | * we cannot race against stop | |
1863 | */ | |
1864 | if (netif_device_present(dev->net) && | |
65841fd5 ML |
1865 | !timer_pending(&dev->delay) && |
1866 | !test_bit(EVENT_RX_HALT, &dev->flags)) | |
ab6f148d | 1867 | rx_alloc_submit(dev, GFP_NOIO); |
65841fd5 | 1868 | |
75bd0cbd | 1869 | if (!(dev->txq.qlen >= TX_QLEN(dev))) |
1aa9bc5b | 1870 | netif_tx_wake_all_queues(dev->net); |
75bd0cbd ML |
1871 | tasklet_schedule (&dev->bh); |
1872 | } | |
69ee472f | 1873 | } |
5d9d01a3 ON |
1874 | |
1875 | if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) | |
1876 | usb_autopm_get_interface_no_resume(intf); | |
1877 | ||
1da177e4 LT |
1878 | return 0; |
1879 | } | |
38bde1d4 | 1880 | EXPORT_SYMBOL_GPL(usbnet_resume); |
1da177e4 | 1881 | |
5d9d01a3 ON |
1882 | /* |
1883 | * Either a subdriver implements manage_power, then it is assumed to always | |
1884 | * be ready to be suspended or it reports the readiness to be suspended | |
1885 | * explicitly | |
1886 | */ | |
1887 | void usbnet_device_suggests_idle(struct usbnet *dev) | |
1888 | { | |
1889 | if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { | |
1890 | dev->intf->needs_remote_wakeup = 1; | |
1891 | usb_autopm_put_interface_async(dev->intf); | |
1892 | } | |
1893 | } | |
1894 | EXPORT_SYMBOL(usbnet_device_suggests_idle); | |
1da177e4 | 1895 | |
2dd7c8cf ON |
1896 | /* |
1897 | * For devices that can do without special commands | |
1898 | */ | |
1899 | int usbnet_manage_power(struct usbnet *dev, int on) | |
1900 | { | |
1901 | dev->intf->needs_remote_wakeup = on; | |
1902 | return 0; | |
1903 | } | |
1904 | EXPORT_SYMBOL(usbnet_manage_power); | |
1905 | ||
ac64995d ML |
1906 | void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) |
1907 | { | |
1908 | /* update link after link is reseted */ | |
1909 | if (link && !need_reset) | |
1910 | netif_carrier_on(dev->net); | |
1911 | else | |
1912 | netif_carrier_off(dev->net); | |
1913 | ||
1914 | if (need_reset && link) | |
1915 | usbnet_defer_kevent(dev, EVENT_LINK_RESET); | |
4b49f58f ML |
1916 | else |
1917 | usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); | |
ac64995d ML |
1918 | } |
1919 | EXPORT_SYMBOL(usbnet_link_change); | |
1920 | ||
877bd862 | 1921 | /*-------------------------------------------------------------------------*/ |
0547fad2 ML |
1922 | static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, |
1923 | u16 value, u16 index, void *data, u16 size) | |
877bd862 ML |
1924 | { |
1925 | void *buf = NULL; | |
1926 | int err = -ENOMEM; | |
1927 | ||
1928 | netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" | |
1929 | " value=0x%04x index=0x%04x size=%d\n", | |
1930 | cmd, reqtype, value, index, size); | |
1931 | ||
6c22fce0 | 1932 | if (size) { |
877bd862 ML |
1933 | buf = kmalloc(size, GFP_KERNEL); |
1934 | if (!buf) | |
1935 | goto out; | |
1936 | } | |
1937 | ||
1938 | err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), | |
1939 | cmd, reqtype, value, index, buf, size, | |
1940 | USB_CTRL_GET_TIMEOUT); | |
6c22fce0 ON |
1941 | if (err > 0 && err <= size) { |
1942 | if (data) | |
1943 | memcpy(data, buf, err); | |
1944 | else | |
1945 | netdev_dbg(dev->net, | |
1946 | "Huh? Data requested but thrown away.\n"); | |
1947 | } | |
877bd862 ML |
1948 | kfree(buf); |
1949 | out: | |
1950 | return err; | |
1951 | } | |
877bd862 | 1952 | |
0547fad2 ML |
1953 | static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, |
1954 | u16 value, u16 index, const void *data, | |
1955 | u16 size) | |
877bd862 ML |
1956 | { |
1957 | void *buf = NULL; | |
1958 | int err = -ENOMEM; | |
1959 | ||
1960 | netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" | |
1961 | " value=0x%04x index=0x%04x size=%d\n", | |
1962 | cmd, reqtype, value, index, size); | |
1963 | ||
1964 | if (data) { | |
1965 | buf = kmemdup(data, size, GFP_KERNEL); | |
1966 | if (!buf) | |
1967 | goto out; | |
6c22fce0 ON |
1968 | } else { |
1969 | if (size) { | |
1970 | WARN_ON_ONCE(1); | |
1971 | err = -EINVAL; | |
1972 | goto out; | |
1973 | } | |
1974 | } | |
877bd862 ML |
1975 | |
1976 | err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
1977 | cmd, reqtype, value, index, buf, size, | |
1978 | USB_CTRL_SET_TIMEOUT); | |
1979 | kfree(buf); | |
1980 | ||
1981 | out: | |
1982 | return err; | |
1983 | } | |
0547fad2 ML |
1984 | |
1985 | /* | |
1986 | * The function can't be called inside suspend/resume callback, | |
1987 | * otherwise deadlock will be caused. | |
1988 | */ | |
1989 | int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, | |
1990 | u16 value, u16 index, void *data, u16 size) | |
1991 | { | |
6f0a0986 ML |
1992 | int ret; |
1993 | ||
1994 | if (usb_autopm_get_interface(dev->intf) < 0) | |
1995 | return -ENODEV; | |
1996 | ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, | |
1997 | data, size); | |
1998 | usb_autopm_put_interface(dev->intf); | |
1999 | return ret; | |
0547fad2 ML |
2000 | } |
2001 | EXPORT_SYMBOL_GPL(usbnet_read_cmd); | |
2002 | ||
2003 | /* | |
2004 | * The function can't be called inside suspend/resume callback, | |
2005 | * otherwise deadlock will be caused. | |
2006 | */ | |
2007 | int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, | |
2008 | u16 value, u16 index, const void *data, u16 size) | |
2009 | { | |
6f0a0986 ML |
2010 | int ret; |
2011 | ||
2012 | if (usb_autopm_get_interface(dev->intf) < 0) | |
2013 | return -ENODEV; | |
2014 | ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, | |
2015 | data, size); | |
2016 | usb_autopm_put_interface(dev->intf); | |
2017 | return ret; | |
0547fad2 | 2018 | } |
877bd862 ML |
2019 | EXPORT_SYMBOL_GPL(usbnet_write_cmd); |
2020 | ||
0547fad2 ML |
2021 | /* |
2022 | * The function can be called inside suspend/resume callback safely | |
2023 | * and should only be called by suspend/resume callback generally. | |
2024 | */ | |
2025 | int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, | |
2026 | u16 value, u16 index, void *data, u16 size) | |
2027 | { | |
2028 | return __usbnet_read_cmd(dev, cmd, reqtype, value, index, | |
2029 | data, size); | |
2030 | } | |
2031 | EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); | |
2032 | ||
2033 | /* | |
2034 | * The function can be called inside suspend/resume callback safely | |
2035 | * and should only be called by suspend/resume callback generally. | |
2036 | */ | |
2037 | int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, | |
2038 | u16 value, u16 index, const void *data, | |
2039 | u16 size) | |
2040 | { | |
2041 | return __usbnet_write_cmd(dev, cmd, reqtype, value, index, | |
2042 | data, size); | |
2043 | } | |
2044 | EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); | |
2045 | ||
877bd862 ML |
2046 | static void usbnet_async_cmd_cb(struct urb *urb) |
2047 | { | |
2048 | struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; | |
2049 | int status = urb->status; | |
2050 | ||
2051 | if (status < 0) | |
2052 | dev_dbg(&urb->dev->dev, "%s failed with %d", | |
2053 | __func__, status); | |
2054 | ||
2055 | kfree(req); | |
2056 | usb_free_urb(urb); | |
2057 | } | |
2058 | ||
0547fad2 ML |
2059 | /* |
2060 | * The caller must make sure that device can't be put into suspend | |
2061 | * state until the control URB completes. | |
2062 | */ | |
877bd862 ML |
2063 | int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, |
2064 | u16 value, u16 index, const void *data, u16 size) | |
2065 | { | |
2066 | struct usb_ctrlrequest *req = NULL; | |
2067 | struct urb *urb; | |
2068 | int err = -ENOMEM; | |
2069 | void *buf = NULL; | |
2070 | ||
2071 | netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" | |
2072 | " value=0x%04x index=0x%04x size=%d\n", | |
2073 | cmd, reqtype, value, index, size); | |
2074 | ||
2075 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
ef6cd130 | 2076 | if (!urb) |
877bd862 | 2077 | goto fail; |
877bd862 ML |
2078 | |
2079 | if (data) { | |
2080 | buf = kmemdup(data, size, GFP_ATOMIC); | |
2081 | if (!buf) { | |
2082 | netdev_err(dev->net, "Error allocating buffer" | |
2083 | " in %s!\n", __func__); | |
2084 | goto fail_free; | |
2085 | } | |
2086 | } | |
2087 | ||
2088 | req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); | |
38673c82 | 2089 | if (!req) |
877bd862 | 2090 | goto fail_free_buf; |
877bd862 ML |
2091 | |
2092 | req->bRequestType = reqtype; | |
2093 | req->bRequest = cmd; | |
2094 | req->wValue = cpu_to_le16(value); | |
2095 | req->wIndex = cpu_to_le16(index); | |
2096 | req->wLength = cpu_to_le16(size); | |
2097 | ||
2098 | usb_fill_control_urb(urb, dev->udev, | |
2099 | usb_sndctrlpipe(dev->udev, 0), | |
2100 | (void *)req, buf, size, | |
2101 | usbnet_async_cmd_cb, req); | |
2102 | urb->transfer_flags |= URB_FREE_BUFFER; | |
2103 | ||
2104 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
2105 | if (err < 0) { | |
2106 | netdev_err(dev->net, "Error submitting the control" | |
2107 | " message: status=%d\n", err); | |
2108 | goto fail_free; | |
2109 | } | |
2110 | return 0; | |
2111 | ||
2112 | fail_free_buf: | |
2113 | kfree(buf); | |
2114 | fail_free: | |
2115 | kfree(req); | |
2116 | usb_free_urb(urb); | |
2117 | fail: | |
2118 | return err; | |
2119 | ||
2120 | } | |
2121 | EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); | |
1da177e4 LT |
2122 | /*-------------------------------------------------------------------------*/ |
2123 | ||
f29fc259 | 2124 | static int __init usbnet_init(void) |
1da177e4 | 2125 | { |
c582a950 TF |
2126 | /* Compiler should optimize this out. */ |
2127 | BUILD_BUG_ON( | |
2128 | FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); | |
1da177e4 | 2129 | |
c7e12ead | 2130 | eth_random_addr(node_id); |
cb1cebbe | 2131 | return 0; |
1da177e4 | 2132 | } |
f29fc259 | 2133 | module_init(usbnet_init); |
1da177e4 | 2134 | |
f29fc259 | 2135 | static void __exit usbnet_exit(void) |
1da177e4 | 2136 | { |
1da177e4 | 2137 | } |
f29fc259 | 2138 | module_exit(usbnet_exit); |
1da177e4 | 2139 | |
f29fc259 | 2140 | MODULE_AUTHOR("David Brownell"); |
090ffa9d | 2141 | MODULE_DESCRIPTION("USB network driver framework"); |
f29fc259 | 2142 | MODULE_LICENSE("GPL"); |