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Commit | Line | Data |
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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
090ffa9d | 3 | * USB Network driver infrastructure |
f29fc259 | 4 | * Copyright (C) 2000-2005 by David Brownell |
1da177e4 | 5 | * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> |
1da177e4 LT |
6 | */ |
7 | ||
8 | /* | |
9 | * This is a generic "USB networking" framework that works with several | |
090ffa9d DB |
10 | * kinds of full and high speed networking devices: host-to-host cables, |
11 | * smart usb peripherals, and actual Ethernet adapters. | |
1da177e4 | 12 | * |
090ffa9d DB |
13 | * These devices usually differ in terms of control protocols (if they |
14 | * even have one!) and sometimes they define new framing to wrap or batch | |
15 | * Ethernet packets. Otherwise, they talk to USB pretty much the same, | |
16 | * so interface (un)binding, endpoint I/O queues, fault handling, and other | |
17 | * issues can usefully be addressed by this framework. | |
18 | */ | |
1da177e4 LT |
19 | |
20 | // #define DEBUG // error path messages, extra info | |
21 | // #define VERBOSE // more; success messages | |
22 | ||
1da177e4 | 23 | #include <linux/module.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/etherdevice.h> | |
03ad032b | 27 | #include <linux/ctype.h> |
1da177e4 LT |
28 | #include <linux/ethtool.h> |
29 | #include <linux/workqueue.h> | |
30 | #include <linux/mii.h> | |
1da177e4 | 31 | #include <linux/usb.h> |
3692e94f | 32 | #include <linux/usb/usbnet.h> |
5a0e3ad6 | 33 | #include <linux/slab.h> |
fd1f170d | 34 | #include <linux/kernel.h> |
b0786b43 | 35 | #include <linux/pm_runtime.h> |
f29fc259 DB |
36 | |
37 | #define DRIVER_VERSION "22-Aug-2005" | |
1da177e4 LT |
38 | |
39 | ||
40 | /*-------------------------------------------------------------------------*/ | |
41 | ||
42 | /* | |
43 | * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. | |
44 | * Several dozen bytes of IPv4 data can fit in two such transactions. | |
45 | * One maximum size Ethernet packet takes twenty four of them. | |
46 | * For high speed, each frame comfortably fits almost 36 max size | |
47 | * Ethernet packets (so queues should be bigger). | |
f29fc259 | 48 | * |
a88c32ae ML |
49 | * The goal is to let the USB host controller be busy for 5msec or |
50 | * more before an irq is required, under load. Jumbograms change | |
51 | * the equation. | |
1da177e4 | 52 | */ |
a88c32ae ML |
53 | #define MAX_QUEUE_MEMORY (60 * 1518) |
54 | #define RX_QLEN(dev) ((dev)->rx_qlen) | |
55 | #define TX_QLEN(dev) ((dev)->tx_qlen) | |
1da177e4 | 56 | |
1da177e4 LT |
57 | // reawaken network queue this soon after stopping; else watchdog barks |
58 | #define TX_TIMEOUT_JIFFIES (5*HZ) | |
59 | ||
37ebb549 PM |
60 | /* throttle rx/tx briefly after some faults, so hub_wq might disconnect() |
61 | * us (it polls at HZ/4 usually) before we report too many false errors. | |
62 | */ | |
1da177e4 LT |
63 | #define THROTTLE_JIFFIES (HZ/8) |
64 | ||
1da177e4 LT |
65 | // between wakeups |
66 | #define UNLINK_TIMEOUT_MS 3 | |
67 | ||
68 | /*-------------------------------------------------------------------------*/ | |
69 | ||
70 | // randomly generated ethernet address | |
71 | static u8 node_id [ETH_ALEN]; | |
72 | ||
1da177e4 LT |
73 | /* use ethtool to change the level for any given device */ |
74 | static int msg_level = -1; | |
75 | module_param (msg_level, int, 0); | |
76 | MODULE_PARM_DESC (msg_level, "Override default message level"); | |
77 | ||
1da177e4 LT |
78 | /*-------------------------------------------------------------------------*/ |
79 | ||
1da177e4 | 80 | /* handles CDC Ethernet and many other network "bulk data" interfaces */ |
2e55cc72 | 81 | int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) |
1da177e4 LT |
82 | { |
83 | int tmp; | |
84 | struct usb_host_interface *alt = NULL; | |
85 | struct usb_host_endpoint *in = NULL, *out = NULL; | |
86 | struct usb_host_endpoint *status = NULL; | |
87 | ||
88 | for (tmp = 0; tmp < intf->num_altsetting; tmp++) { | |
89 | unsigned ep; | |
90 | ||
91 | in = out = status = NULL; | |
92 | alt = intf->altsetting + tmp; | |
93 | ||
94 | /* take the first altsetting with in-bulk + out-bulk; | |
95 | * remember any status endpoint, just in case; | |
70f23fd6 | 96 | * ignore other endpoints and altsettings. |
1da177e4 LT |
97 | */ |
98 | for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { | |
99 | struct usb_host_endpoint *e; | |
100 | int intr = 0; | |
101 | ||
102 | e = alt->endpoint + ep; | |
f1f168ef BM |
103 | |
104 | /* ignore endpoints which cannot transfer data */ | |
105 | if (!usb_endpoint_maxp(&e->desc)) | |
106 | continue; | |
107 | ||
1da177e4 LT |
108 | switch (e->desc.bmAttributes) { |
109 | case USB_ENDPOINT_XFER_INT: | |
fc6e2544 | 110 | if (!usb_endpoint_dir_in(&e->desc)) |
1da177e4 LT |
111 | continue; |
112 | intr = 1; | |
113 | /* FALLTHROUGH */ | |
114 | case USB_ENDPOINT_XFER_BULK: | |
115 | break; | |
116 | default: | |
117 | continue; | |
118 | } | |
fc6e2544 | 119 | if (usb_endpoint_dir_in(&e->desc)) { |
1da177e4 LT |
120 | if (!intr && !in) |
121 | in = e; | |
122 | else if (intr && !status) | |
123 | status = e; | |
124 | } else { | |
125 | if (!out) | |
126 | out = e; | |
127 | } | |
128 | } | |
129 | if (in && out) | |
130 | break; | |
131 | } | |
132 | if (!alt || !in || !out) | |
133 | return -EINVAL; | |
134 | ||
8e95a202 JP |
135 | if (alt->desc.bAlternateSetting != 0 || |
136 | !(dev->driver_info->flags & FLAG_NO_SETINT)) { | |
1da177e4 LT |
137 | tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, |
138 | alt->desc.bAlternateSetting); | |
139 | if (tmp < 0) | |
140 | return tmp; | |
141 | } | |
cb1cebbe | 142 | |
1da177e4 LT |
143 | dev->in = usb_rcvbulkpipe (dev->udev, |
144 | in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
145 | dev->out = usb_sndbulkpipe (dev->udev, | |
146 | out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
147 | dev->status = status; | |
148 | return 0; | |
149 | } | |
2e55cc72 | 150 | EXPORT_SYMBOL_GPL(usbnet_get_endpoints); |
1da177e4 | 151 | |
03ad032b PH |
152 | int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) |
153 | { | |
51487ae7 | 154 | int tmp = -1, ret; |
03ad032b PH |
155 | unsigned char buf [13]; |
156 | ||
51487ae7 AS |
157 | ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); |
158 | if (ret == 12) | |
159 | tmp = hex2bin(dev->net->dev_addr, buf, 6); | |
160 | if (tmp < 0) { | |
03ad032b PH |
161 | dev_dbg(&dev->udev->dev, |
162 | "bad MAC string %d fetch, %d\n", iMACAddress, tmp); | |
51487ae7 AS |
163 | if (ret >= 0) |
164 | ret = -EINVAL; | |
165 | return ret; | |
03ad032b | 166 | } |
03ad032b PH |
167 | return 0; |
168 | } | |
169 | EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); | |
170 | ||
24ead299 | 171 | static void intr_complete (struct urb *urb) |
172 | { | |
173 | struct usbnet *dev = urb->context; | |
174 | int status = urb->status; | |
175 | ||
176 | switch (status) { | |
177 | /* success */ | |
178 | case 0: | |
179 | dev->driver_info->status(dev, urb); | |
180 | break; | |
181 | ||
182 | /* software-driven interface shutdown */ | |
183 | case -ENOENT: /* urb killed */ | |
184 | case -ESHUTDOWN: /* hardware gone */ | |
185 | netif_dbg(dev, ifdown, dev->net, | |
186 | "intr shutdown, code %d\n", status); | |
187 | return; | |
188 | ||
189 | /* NOTE: not throttling like RX/TX, since this endpoint | |
190 | * already polls infrequently | |
191 | */ | |
192 | default: | |
193 | netdev_dbg(dev->net, "intr status %d\n", status); | |
194 | break; | |
195 | } | |
196 | ||
24ead299 | 197 | status = usb_submit_urb (urb, GFP_ATOMIC); |
198 | if (status != 0) | |
199 | netif_err(dev, timer, dev->net, | |
200 | "intr resubmit --> %d\n", status); | |
201 | } | |
1da177e4 LT |
202 | |
203 | static int init_status (struct usbnet *dev, struct usb_interface *intf) | |
204 | { | |
205 | char *buf = NULL; | |
206 | unsigned pipe = 0; | |
207 | unsigned maxp; | |
208 | unsigned period; | |
209 | ||
210 | if (!dev->driver_info->status) | |
211 | return 0; | |
212 | ||
213 | pipe = usb_rcvintpipe (dev->udev, | |
214 | dev->status->desc.bEndpointAddress | |
215 | & USB_ENDPOINT_NUMBER_MASK); | |
216 | maxp = usb_maxpacket (dev->udev, pipe, 0); | |
217 | ||
218 | /* avoid 1 msec chatter: min 8 msec poll rate */ | |
219 | period = max ((int) dev->status->desc.bInterval, | |
220 | (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); | |
221 | ||
e94b1766 | 222 | buf = kmalloc (maxp, GFP_KERNEL); |
1da177e4 | 223 | if (buf) { |
e94b1766 | 224 | dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); |
1da177e4 LT |
225 | if (!dev->interrupt) { |
226 | kfree (buf); | |
227 | return -ENOMEM; | |
228 | } else { | |
229 | usb_fill_int_urb(dev->interrupt, dev->udev, pipe, | |
230 | buf, maxp, intr_complete, dev, period); | |
720f3d7c | 231 | dev->interrupt->transfer_flags |= URB_FREE_BUFFER; |
1da177e4 LT |
232 | dev_dbg(&intf->dev, |
233 | "status ep%din, %d bytes period %d\n", | |
234 | usb_pipeendpoint(pipe), maxp, period); | |
235 | } | |
236 | } | |
18ab458f | 237 | return 0; |
1da177e4 LT |
238 | } |
239 | ||
6eecdc5f DW |
240 | /* Submit the interrupt URB if not previously submitted, increasing refcount */ |
241 | int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) | |
242 | { | |
243 | int ret = 0; | |
244 | ||
245 | WARN_ON_ONCE(dev->interrupt == NULL); | |
246 | if (dev->interrupt) { | |
247 | mutex_lock(&dev->interrupt_mutex); | |
248 | ||
249 | if (++dev->interrupt_count == 1) | |
250 | ret = usb_submit_urb(dev->interrupt, mem_flags); | |
251 | ||
252 | dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", | |
253 | dev->interrupt_count); | |
254 | mutex_unlock(&dev->interrupt_mutex); | |
255 | } | |
256 | return ret; | |
257 | } | |
258 | EXPORT_SYMBOL_GPL(usbnet_status_start); | |
259 | ||
260 | /* For resume; submit interrupt URB if previously submitted */ | |
261 | static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) | |
262 | { | |
263 | int ret = 0; | |
264 | ||
265 | mutex_lock(&dev->interrupt_mutex); | |
266 | if (dev->interrupt_count) { | |
267 | ret = usb_submit_urb(dev->interrupt, mem_flags); | |
268 | dev_dbg(&dev->udev->dev, | |
269 | "submitted interrupt URB for resume\n"); | |
270 | } | |
271 | mutex_unlock(&dev->interrupt_mutex); | |
272 | return ret; | |
273 | } | |
274 | ||
275 | /* Kill the interrupt URB if all submitters want it killed */ | |
276 | void usbnet_status_stop(struct usbnet *dev) | |
277 | { | |
278 | if (dev->interrupt) { | |
279 | mutex_lock(&dev->interrupt_mutex); | |
280 | WARN_ON(dev->interrupt_count == 0); | |
281 | ||
282 | if (dev->interrupt_count && --dev->interrupt_count == 0) | |
283 | usb_kill_urb(dev->interrupt); | |
284 | ||
285 | dev_dbg(&dev->udev->dev, | |
286 | "decremented interrupt URB count to %d\n", | |
287 | dev->interrupt_count); | |
288 | mutex_unlock(&dev->interrupt_mutex); | |
289 | } | |
290 | } | |
291 | EXPORT_SYMBOL_GPL(usbnet_status_stop); | |
292 | ||
293 | /* For suspend; always kill interrupt URB */ | |
294 | static void __usbnet_status_stop_force(struct usbnet *dev) | |
295 | { | |
296 | if (dev->interrupt) { | |
297 | mutex_lock(&dev->interrupt_mutex); | |
298 | usb_kill_urb(dev->interrupt); | |
299 | dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); | |
300 | mutex_unlock(&dev->interrupt_mutex); | |
301 | } | |
302 | } | |
303 | ||
2e55cc72 DB |
304 | /* Passes this packet up the stack, updating its accounting. |
305 | * Some link protocols batch packets, so their rx_fixup paths | |
306 | * can return clones as well as just modify the original skb. | |
307 | */ | |
308 | void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) | |
1da177e4 | 309 | { |
c8b5d129 | 310 | struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64); |
2695578b | 311 | unsigned long flags; |
1da177e4 LT |
312 | int status; |
313 | ||
7834ddbc JK |
314 | if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { |
315 | skb_queue_tail(&dev->rxq_pause, skb); | |
316 | return; | |
317 | } | |
318 | ||
81e0ce79 BM |
319 | /* only update if unset to allow minidriver rx_fixup override */ |
320 | if (skb->protocol == 0) | |
321 | skb->protocol = eth_type_trans (skb, dev->net); | |
322 | ||
2695578b | 323 | flags = u64_stats_update_begin_irqsave(&stats64->syncp); |
c8b5d129 GU |
324 | stats64->rx_packets++; |
325 | stats64->rx_bytes += skb->len; | |
2695578b | 326 | u64_stats_update_end_irqrestore(&stats64->syncp, flags); |
1da177e4 | 327 | |
a475f603 JP |
328 | netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", |
329 | skb->len + sizeof (struct ethhdr), skb->protocol); | |
1da177e4 | 330 | memset (skb->cb, 0, sizeof (struct skb_data)); |
f9b491ec MR |
331 | |
332 | if (skb_defer_rx_timestamp(skb)) | |
333 | return; | |
334 | ||
1da177e4 | 335 | status = netif_rx (skb); |
a475f603 JP |
336 | if (status != NET_RX_SUCCESS) |
337 | netif_dbg(dev, rx_err, dev->net, | |
338 | "netif_rx status %d\n", status); | |
1da177e4 | 339 | } |
2e55cc72 | 340 | EXPORT_SYMBOL_GPL(usbnet_skb_return); |
1da177e4 | 341 | |
a88c32ae ML |
342 | /* must be called if hard_mtu or rx_urb_size changed */ |
343 | void usbnet_update_max_qlen(struct usbnet *dev) | |
344 | { | |
345 | enum usb_device_speed speed = dev->udev->speed; | |
346 | ||
486f28b3 ON |
347 | if (!dev->rx_urb_size || !dev->hard_mtu) |
348 | goto insanity; | |
a88c32ae ML |
349 | switch (speed) { |
350 | case USB_SPEED_HIGH: | |
351 | dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; | |
352 | dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; | |
353 | break; | |
452c447a | 354 | case USB_SPEED_SUPER: |
ea079842 | 355 | case USB_SPEED_SUPER_PLUS: |
452c447a ML |
356 | /* |
357 | * Not take default 5ms qlen for super speed HC to | |
358 | * save memory, and iperf tests show 2.5ms qlen can | |
359 | * work well | |
360 | */ | |
361 | dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; | |
362 | dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; | |
363 | break; | |
a88c32ae | 364 | default: |
486f28b3 | 365 | insanity: |
a88c32ae ML |
366 | dev->rx_qlen = dev->tx_qlen = 4; |
367 | } | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); | |
370 | ||
1da177e4 LT |
371 | \f |
372 | /*------------------------------------------------------------------------- | |
373 | * | |
374 | * Network Device Driver (peer link to "Host Device", from USB host) | |
375 | * | |
376 | *-------------------------------------------------------------------------*/ | |
377 | ||
777baa47 | 378 | int usbnet_change_mtu (struct net_device *net, int new_mtu) |
1da177e4 LT |
379 | { |
380 | struct usbnet *dev = netdev_priv(net); | |
f29fc259 | 381 | int ll_mtu = new_mtu + net->hard_header_len; |
a99c1949 JP |
382 | int old_hard_mtu = dev->hard_mtu; |
383 | int old_rx_urb_size = dev->rx_urb_size; | |
1da177e4 | 384 | |
1da177e4 | 385 | // no second zero-length packet read wanted after mtu-sized packets |
f29fc259 | 386 | if ((ll_mtu % dev->maxpacket) == 0) |
1da177e4 LT |
387 | return -EDOM; |
388 | net->mtu = new_mtu; | |
a99c1949 JP |
389 | |
390 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
391 | if (dev->rx_urb_size == old_hard_mtu) { | |
392 | dev->rx_urb_size = dev->hard_mtu; | |
43daa96b SL |
393 | if (dev->rx_urb_size > old_rx_urb_size) { |
394 | usbnet_pause_rx(dev); | |
a99c1949 | 395 | usbnet_unlink_rx_urbs(dev); |
43daa96b SL |
396 | usbnet_resume_rx(dev); |
397 | } | |
a99c1949 JP |
398 | } |
399 | ||
a88c32ae ML |
400 | /* max qlen depend on hard_mtu and rx_urb_size */ |
401 | usbnet_update_max_qlen(dev); | |
402 | ||
1da177e4 LT |
403 | return 0; |
404 | } | |
777baa47 | 405 | EXPORT_SYMBOL_GPL(usbnet_change_mtu); |
1da177e4 | 406 | |
5b6e9bcd ML |
407 | /* The caller must hold list->lock */ |
408 | static void __usbnet_queue_skb(struct sk_buff_head *list, | |
409 | struct sk_buff *newsk, enum skb_state state) | |
410 | { | |
411 | struct skb_data *entry = (struct skb_data *) newsk->cb; | |
412 | ||
413 | __skb_queue_tail(list, newsk); | |
414 | entry->state = state; | |
415 | } | |
416 | ||
1da177e4 LT |
417 | /*-------------------------------------------------------------------------*/ |
418 | ||
1da177e4 LT |
419 | /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from |
420 | * completion callbacks. 2.5 should have fixed those bugs... | |
421 | */ | |
422 | ||
5b6e9bcd ML |
423 | static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, |
424 | struct sk_buff_head *list, enum skb_state state) | |
1da177e4 | 425 | { |
1da177e4 | 426 | unsigned long flags; |
5b6e9bcd ML |
427 | enum skb_state old_state; |
428 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
1da177e4 | 429 | |
8728b834 | 430 | spin_lock_irqsave(&list->lock, flags); |
5b6e9bcd ML |
431 | old_state = entry->state; |
432 | entry->state = state; | |
8728b834 | 433 | __skb_unlink(skb, list); |
fcb0bb6a ES |
434 | |
435 | /* defer_bh() is never called with list == &dev->done. | |
436 | * spin_lock_nested() tells lockdep that it is OK to take | |
437 | * dev->done.lock here with list->lock held. | |
438 | */ | |
439 | spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); | |
440 | ||
8728b834 | 441 | __skb_queue_tail(&dev->done, skb); |
1da177e4 | 442 | if (dev->done.qlen == 1) |
8728b834 | 443 | tasklet_schedule(&dev->bh); |
fcb0bb6a ES |
444 | spin_unlock(&dev->done.lock); |
445 | spin_unlock_irqrestore(&list->lock, flags); | |
5b6e9bcd | 446 | return old_state; |
1da177e4 LT |
447 | } |
448 | ||
449 | /* some work can't be done in tasklets, so we use keventd | |
450 | * | |
451 | * NOTE: annoying asymmetry: if it's active, schedule_work() fails, | |
452 | * but tasklet_schedule() doesn't. hope the failure is rare. | |
453 | */ | |
2e55cc72 | 454 | void usbnet_defer_kevent (struct usbnet *dev, int work) |
1da177e4 LT |
455 | { |
456 | set_bit (work, &dev->flags); | |
ab18a9c9 ON |
457 | if (!schedule_work (&dev->kevent)) |
458 | netdev_dbg(dev->net, "kevent %d may have been dropped\n", work); | |
459 | else | |
60b86755 | 460 | netdev_dbg(dev->net, "kevent %d scheduled\n", work); |
1da177e4 | 461 | } |
2e55cc72 | 462 | EXPORT_SYMBOL_GPL(usbnet_defer_kevent); |
1da177e4 LT |
463 | |
464 | /*-------------------------------------------------------------------------*/ | |
465 | ||
7d12e780 | 466 | static void rx_complete (struct urb *urb); |
1da177e4 | 467 | |
dacb3975 | 468 | static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) |
1da177e4 LT |
469 | { |
470 | struct sk_buff *skb; | |
471 | struct skb_data *entry; | |
472 | int retval = 0; | |
473 | unsigned long lockflags; | |
2e55cc72 | 474 | size_t size = dev->rx_urb_size; |
1da177e4 | 475 | |
70c37bf9 BM |
476 | /* prevent rx skb allocation when error ratio is high */ |
477 | if (test_bit(EVENT_RX_KILL, &dev->flags)) { | |
478 | usb_free_urb(urb); | |
479 | return -ENOLINK; | |
480 | } | |
481 | ||
a4abd7a8 BM |
482 | if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags)) |
483 | skb = __netdev_alloc_skb(dev->net, size, flags); | |
484 | else | |
485 | skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); | |
7bdd4027 | 486 | if (!skb) { |
a475f603 | 487 | netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); |
2e55cc72 | 488 | usbnet_defer_kevent (dev, EVENT_RX_MEMORY); |
1da177e4 | 489 | usb_free_urb (urb); |
dacb3975 | 490 | return -ENOMEM; |
1da177e4 | 491 | } |
1da177e4 LT |
492 | |
493 | entry = (struct skb_data *) skb->cb; | |
494 | entry->urb = urb; | |
495 | entry->dev = dev; | |
1da177e4 LT |
496 | entry->length = 0; |
497 | ||
498 | usb_fill_bulk_urb (urb, dev->udev, dev->in, | |
499 | skb->data, size, rx_complete, skb); | |
1da177e4 LT |
500 | |
501 | spin_lock_irqsave (&dev->rxq.lock, lockflags); | |
502 | ||
8e95a202 JP |
503 | if (netif_running (dev->net) && |
504 | netif_device_present (dev->net) && | |
ad70411a | 505 | test_bit(EVENT_DEV_OPEN, &dev->flags) && |
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); | |
f3edc2db | 802 | const 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; |
f3edc2db | 865 | const struct driver_info *info = dev->driver_info; |
1da177e4 | 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 | ||
8bae3551 PR |
950 | int usbnet_get_link_ksettings(struct net_device *net, |
951 | struct ethtool_link_ksettings *cmd) | |
952 | { | |
953 | struct usbnet *dev = netdev_priv(net); | |
954 | ||
955 | if (!dev->mii.mdio_read) | |
956 | return -EOPNOTSUPP; | |
957 | ||
82c01a84 | 958 | mii_ethtool_get_link_ksettings(&dev->mii, cmd); |
959 | ||
960 | return 0; | |
8bae3551 PR |
961 | } |
962 | EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings); | |
963 | ||
964 | int usbnet_set_link_ksettings(struct net_device *net, | |
965 | const struct ethtool_link_ksettings *cmd) | |
966 | { | |
967 | struct usbnet *dev = netdev_priv(net); | |
968 | int retval; | |
969 | ||
970 | if (!dev->mii.mdio_write) | |
971 | return -EOPNOTSUPP; | |
972 | ||
973 | retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd); | |
974 | ||
975 | /* link speed/duplex might have changed */ | |
976 | if (dev->driver_info->link_reset) | |
977 | dev->driver_info->link_reset(dev); | |
978 | ||
979 | /* hard_mtu or rx_urb_size may change in link_reset() */ | |
980 | usbnet_update_max_qlen(dev); | |
981 | ||
982 | return retval; | |
983 | } | |
984 | EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings); | |
985 | ||
c8b5d129 GU |
986 | void usbnet_get_stats64(struct net_device *net, struct rtnl_link_stats64 *stats) |
987 | { | |
988 | struct usbnet *dev = netdev_priv(net); | |
989 | unsigned int start; | |
990 | int cpu; | |
991 | ||
992 | netdev_stats_to_stats64(stats, &net->stats); | |
993 | ||
994 | for_each_possible_cpu(cpu) { | |
995 | struct pcpu_sw_netstats *stats64; | |
996 | u64 rx_packets, rx_bytes; | |
997 | u64 tx_packets, tx_bytes; | |
998 | ||
999 | stats64 = per_cpu_ptr(dev->stats64, cpu); | |
1000 | ||
1001 | do { | |
1002 | start = u64_stats_fetch_begin_irq(&stats64->syncp); | |
1003 | rx_packets = stats64->rx_packets; | |
1004 | rx_bytes = stats64->rx_bytes; | |
1005 | tx_packets = stats64->tx_packets; | |
1006 | tx_bytes = stats64->tx_bytes; | |
1007 | } while (u64_stats_fetch_retry_irq(&stats64->syncp, start)); | |
1008 | ||
1009 | stats->rx_packets += rx_packets; | |
1010 | stats->rx_bytes += rx_bytes; | |
1011 | stats->tx_packets += tx_packets; | |
1012 | stats->tx_bytes += tx_bytes; | |
1013 | } | |
1014 | } | |
1015 | EXPORT_SYMBOL_GPL(usbnet_get_stats64); | |
1016 | ||
c41286fd | 1017 | u32 usbnet_get_link (struct net_device *net) |
1da177e4 LT |
1018 | { |
1019 | struct usbnet *dev = netdev_priv(net); | |
1020 | ||
f29fc259 | 1021 | /* If a check_connect is defined, return its result */ |
1da177e4 LT |
1022 | if (dev->driver_info->check_connect) |
1023 | return dev->driver_info->check_connect (dev) == 0; | |
1024 | ||
c41286fd AB |
1025 | /* if the device has mii operations, use those */ |
1026 | if (dev->mii.mdio_read) | |
1027 | return mii_link_ok(&dev->mii); | |
1028 | ||
05ffb3e2 BM |
1029 | /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ |
1030 | return ethtool_op_get_link(net); | |
1da177e4 | 1031 | } |
c41286fd | 1032 | EXPORT_SYMBOL_GPL(usbnet_get_link); |
1da177e4 | 1033 | |
18ee91fa | 1034 | int usbnet_nway_reset(struct net_device *net) |
1da177e4 LT |
1035 | { |
1036 | struct usbnet *dev = netdev_priv(net); | |
1037 | ||
18ee91fa DB |
1038 | if (!dev->mii.mdio_write) |
1039 | return -EOPNOTSUPP; | |
1040 | ||
1041 | return mii_nway_restart(&dev->mii); | |
1da177e4 | 1042 | } |
18ee91fa | 1043 | EXPORT_SYMBOL_GPL(usbnet_nway_reset); |
1da177e4 | 1044 | |
18ee91fa | 1045 | void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) |
1da177e4 LT |
1046 | { |
1047 | struct usbnet *dev = netdev_priv(net); | |
1048 | ||
86a2f415 PS |
1049 | strlcpy (info->driver, dev->driver_name, sizeof info->driver); |
1050 | strlcpy (info->version, DRIVER_VERSION, sizeof info->version); | |
1051 | strlcpy (info->fw_version, dev->driver_info->description, | |
18ee91fa DB |
1052 | sizeof info->fw_version); |
1053 | usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); | |
1da177e4 | 1054 | } |
18ee91fa | 1055 | EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); |
1da177e4 | 1056 | |
18ee91fa | 1057 | u32 usbnet_get_msglevel (struct net_device *net) |
c41286fd AB |
1058 | { |
1059 | struct usbnet *dev = netdev_priv(net); | |
1060 | ||
18ee91fa DB |
1061 | return dev->msg_enable; |
1062 | } | |
1063 | EXPORT_SYMBOL_GPL(usbnet_get_msglevel); | |
c41286fd | 1064 | |
18ee91fa DB |
1065 | void usbnet_set_msglevel (struct net_device *net, u32 level) |
1066 | { | |
1067 | struct usbnet *dev = netdev_priv(net); | |
1068 | ||
1069 | dev->msg_enable = level; | |
c41286fd | 1070 | } |
18ee91fa | 1071 | EXPORT_SYMBOL_GPL(usbnet_set_msglevel); |
c41286fd | 1072 | |
2e55cc72 | 1073 | /* drivers may override default ethtool_ops in their bind() routine */ |
0fc0b732 | 1074 | static const struct ethtool_ops usbnet_ethtool_ops = { |
2e55cc72 | 1075 | .get_link = usbnet_get_link, |
c41286fd | 1076 | .nway_reset = usbnet_nway_reset, |
18ee91fa | 1077 | .get_drvinfo = usbnet_get_drvinfo, |
2e55cc72 DB |
1078 | .get_msglevel = usbnet_get_msglevel, |
1079 | .set_msglevel = usbnet_set_msglevel, | |
123edb18 | 1080 | .get_ts_info = ethtool_op_get_ts_info, |
8bae3551 PR |
1081 | .get_link_ksettings = usbnet_get_link_ksettings, |
1082 | .set_link_ksettings = usbnet_set_link_ksettings, | |
2e55cc72 | 1083 | }; |
1da177e4 LT |
1084 | |
1085 | /*-------------------------------------------------------------------------*/ | |
1086 | ||
4b49f58f ML |
1087 | static void __handle_link_change(struct usbnet *dev) |
1088 | { | |
1089 | if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) | |
1090 | return; | |
1091 | ||
1092 | if (!netif_carrier_ok(dev->net)) { | |
1093 | /* kill URBs for reading packets to save bus bandwidth */ | |
1094 | unlink_urbs(dev, &dev->rxq); | |
1095 | ||
1096 | /* | |
1097 | * tx_timeout will unlink URBs for sending packets and | |
1098 | * tx queue is stopped by netcore after link becomes off | |
1099 | */ | |
1100 | } else { | |
1101 | /* submitting URBs for reading packets */ | |
1102 | tasklet_schedule(&dev->bh); | |
1103 | } | |
1104 | ||
a88c32ae ML |
1105 | /* hard_mtu or rx_urb_size may change during link change */ |
1106 | usbnet_update_max_qlen(dev); | |
1107 | ||
4b49f58f ML |
1108 | clear_bit(EVENT_LINK_CHANGE, &dev->flags); |
1109 | } | |
1110 | ||
1efed2d0 OB |
1111 | static void usbnet_set_rx_mode(struct net_device *net) |
1112 | { | |
1113 | struct usbnet *dev = netdev_priv(net); | |
1114 | ||
1115 | usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); | |
1116 | } | |
1117 | ||
1118 | static void __handle_set_rx_mode(struct usbnet *dev) | |
1119 | { | |
1120 | if (dev->driver_info->set_rx_mode) | |
1121 | (dev->driver_info->set_rx_mode)(dev); | |
1122 | ||
1123 | clear_bit(EVENT_SET_RX_MODE, &dev->flags); | |
1124 | } | |
1125 | ||
1da177e4 LT |
1126 | /* work that cannot be done in interrupt context uses keventd. |
1127 | * | |
1128 | * NOTE: with 2.5 we could do more of this using completion callbacks, | |
1129 | * especially now that control transfers can be queued. | |
1130 | */ | |
1131 | static void | |
11f17ef3 | 1132 | usbnet_deferred_kevent (struct work_struct *work) |
1da177e4 | 1133 | { |
c4028958 DH |
1134 | struct usbnet *dev = |
1135 | container_of(work, struct usbnet, kevent); | |
1da177e4 LT |
1136 | int status; |
1137 | ||
1138 | /* usb_clear_halt() needs a thread context */ | |
1139 | if (test_bit (EVENT_TX_HALT, &dev->flags)) { | |
1140 | unlink_urbs (dev, &dev->txq); | |
69ee472f ON |
1141 | status = usb_autopm_get_interface(dev->intf); |
1142 | if (status < 0) | |
1143 | goto fail_pipe; | |
1da177e4 | 1144 | status = usb_clear_halt (dev->udev, dev->out); |
69ee472f | 1145 | usb_autopm_put_interface(dev->intf); |
8e95a202 JP |
1146 | if (status < 0 && |
1147 | status != -EPIPE && | |
1148 | status != -ESHUTDOWN) { | |
1da177e4 | 1149 | if (netif_msg_tx_err (dev)) |
69ee472f | 1150 | fail_pipe: |
60b86755 JP |
1151 | netdev_err(dev->net, "can't clear tx halt, status %d\n", |
1152 | status); | |
1da177e4 LT |
1153 | } else { |
1154 | clear_bit (EVENT_TX_HALT, &dev->flags); | |
f29fc259 DB |
1155 | if (status != -ESHUTDOWN) |
1156 | netif_wake_queue (dev->net); | |
1da177e4 LT |
1157 | } |
1158 | } | |
1159 | if (test_bit (EVENT_RX_HALT, &dev->flags)) { | |
1160 | unlink_urbs (dev, &dev->rxq); | |
69ee472f ON |
1161 | status = usb_autopm_get_interface(dev->intf); |
1162 | if (status < 0) | |
1163 | goto fail_halt; | |
1da177e4 | 1164 | status = usb_clear_halt (dev->udev, dev->in); |
69ee472f | 1165 | usb_autopm_put_interface(dev->intf); |
8e95a202 JP |
1166 | if (status < 0 && |
1167 | status != -EPIPE && | |
1168 | status != -ESHUTDOWN) { | |
1da177e4 | 1169 | if (netif_msg_rx_err (dev)) |
69ee472f | 1170 | fail_halt: |
60b86755 JP |
1171 | netdev_err(dev->net, "can't clear rx halt, status %d\n", |
1172 | status); | |
1da177e4 LT |
1173 | } else { |
1174 | clear_bit (EVENT_RX_HALT, &dev->flags); | |
1175 | tasklet_schedule (&dev->bh); | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | /* tasklet could resubmit itself forever if memory is tight */ | |
1180 | if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { | |
1181 | struct urb *urb = NULL; | |
dacb3975 | 1182 | int resched = 1; |
1da177e4 LT |
1183 | |
1184 | if (netif_running (dev->net)) | |
1185 | urb = usb_alloc_urb (0, GFP_KERNEL); | |
1186 | else | |
1187 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
1188 | if (urb != NULL) { | |
1189 | clear_bit (EVENT_RX_MEMORY, &dev->flags); | |
69ee472f | 1190 | status = usb_autopm_get_interface(dev->intf); |
ab60707f JJ |
1191 | if (status < 0) { |
1192 | usb_free_urb(urb); | |
69ee472f | 1193 | goto fail_lowmem; |
ab60707f | 1194 | } |
dacb3975 DM |
1195 | if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) |
1196 | resched = 0; | |
69ee472f ON |
1197 | usb_autopm_put_interface(dev->intf); |
1198 | fail_lowmem: | |
dacb3975 DM |
1199 | if (resched) |
1200 | tasklet_schedule (&dev->bh); | |
1da177e4 LT |
1201 | } |
1202 | } | |
1203 | ||
7ea13c9c | 1204 | if (test_bit (EVENT_LINK_RESET, &dev->flags)) { |
f3edc2db | 1205 | const struct driver_info *info = dev->driver_info; |
7ea13c9c DH |
1206 | int retval = 0; |
1207 | ||
1208 | clear_bit (EVENT_LINK_RESET, &dev->flags); | |
69ee472f ON |
1209 | status = usb_autopm_get_interface(dev->intf); |
1210 | if (status < 0) | |
1211 | goto skip_reset; | |
7ea13c9c | 1212 | if(info->link_reset && (retval = info->link_reset(dev)) < 0) { |
69ee472f ON |
1213 | usb_autopm_put_interface(dev->intf); |
1214 | skip_reset: | |
60b86755 JP |
1215 | netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", |
1216 | retval, | |
1217 | dev->udev->bus->bus_name, | |
1218 | dev->udev->devpath, | |
1219 | info->description); | |
69ee472f ON |
1220 | } else { |
1221 | usb_autopm_put_interface(dev->intf); | |
7ea13c9c | 1222 | } |
4b49f58f ML |
1223 | |
1224 | /* handle link change from link resetting */ | |
1225 | __handle_link_change(dev); | |
7ea13c9c DH |
1226 | } |
1227 | ||
4b49f58f ML |
1228 | if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) |
1229 | __handle_link_change(dev); | |
1230 | ||
1efed2d0 OB |
1231 | if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) |
1232 | __handle_set_rx_mode(dev); | |
1233 | ||
1234 | ||
1da177e4 | 1235 | if (dev->flags) |
60b86755 | 1236 | netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); |
1da177e4 LT |
1237 | } |
1238 | ||
1239 | /*-------------------------------------------------------------------------*/ | |
1240 | ||
7d12e780 | 1241 | static void tx_complete (struct urb *urb) |
1da177e4 LT |
1242 | { |
1243 | struct sk_buff *skb = (struct sk_buff *) urb->context; | |
1244 | struct skb_data *entry = (struct skb_data *) skb->cb; | |
1245 | struct usbnet *dev = entry->dev; | |
1246 | ||
1247 | if (urb->status == 0) { | |
c8b5d129 | 1248 | struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64); |
2695578b | 1249 | unsigned long flags; |
c8b5d129 | 1250 | |
2695578b | 1251 | flags = u64_stats_update_begin_irqsave(&stats64->syncp); |
c8b5d129 GU |
1252 | stats64->tx_packets += entry->packets; |
1253 | stats64->tx_bytes += entry->length; | |
2695578b | 1254 | u64_stats_update_end_irqrestore(&stats64->syncp, flags); |
1da177e4 | 1255 | } else { |
7963837f | 1256 | dev->net->stats.tx_errors++; |
1da177e4 LT |
1257 | |
1258 | switch (urb->status) { | |
1259 | case -EPIPE: | |
2e55cc72 | 1260 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
1da177e4 LT |
1261 | break; |
1262 | ||
1263 | /* software-driven interface shutdown */ | |
1264 | case -ECONNRESET: // async unlink | |
1265 | case -ESHUTDOWN: // hardware gone | |
1266 | break; | |
1267 | ||
37ebb549 PM |
1268 | /* like rx, tx gets controller i/o faults during hub_wq |
1269 | * delays and so it uses the same throttling mechanism. | |
1270 | */ | |
38e2bfc9 PZ |
1271 | case -EPROTO: |
1272 | case -ETIME: | |
1273 | case -EILSEQ: | |
69ee472f | 1274 | usb_mark_last_busy(dev->udev); |
1da177e4 LT |
1275 | if (!timer_pending (&dev->delay)) { |
1276 | mod_timer (&dev->delay, | |
1277 | jiffies + THROTTLE_JIFFIES); | |
a475f603 JP |
1278 | netif_dbg(dev, link, dev->net, |
1279 | "tx throttle %d\n", urb->status); | |
1da177e4 LT |
1280 | } |
1281 | netif_stop_queue (dev->net); | |
1282 | break; | |
1283 | default: | |
a475f603 JP |
1284 | netif_dbg(dev, tx_err, dev->net, |
1285 | "tx err %d\n", entry->urb->status); | |
1da177e4 LT |
1286 | break; |
1287 | } | |
1288 | } | |
1289 | ||
69ee472f | 1290 | usb_autopm_put_interface_async(dev->intf); |
5b6e9bcd | 1291 | (void) defer_bh(dev, skb, &dev->txq, tx_done); |
1da177e4 LT |
1292 | } |
1293 | ||
1294 | /*-------------------------------------------------------------------------*/ | |
1295 | ||
777baa47 | 1296 | void usbnet_tx_timeout (struct net_device *net) |
1da177e4 LT |
1297 | { |
1298 | struct usbnet *dev = netdev_priv(net); | |
1299 | ||
1300 | unlink_urbs (dev, &dev->txq); | |
1301 | tasklet_schedule (&dev->bh); | |
dbcdd4d5 ON |
1302 | /* this needs to be handled individually because the generic layer |
1303 | * doesn't know what is sufficient and could not restore private | |
1304 | * information if a remedy of an unconditional reset were used. | |
1305 | */ | |
1306 | if (dev->driver_info->recover) | |
1307 | (dev->driver_info->recover)(dev); | |
1da177e4 | 1308 | } |
777baa47 | 1309 | EXPORT_SYMBOL_GPL(usbnet_tx_timeout); |
1da177e4 LT |
1310 | |
1311 | /*-------------------------------------------------------------------------*/ | |
1312 | ||
638c5115 ML |
1313 | static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) |
1314 | { | |
1315 | unsigned num_sgs, total_len = 0; | |
1316 | int i, s = 0; | |
1317 | ||
1318 | num_sgs = skb_shinfo(skb)->nr_frags + 1; | |
1319 | if (num_sgs == 1) | |
1320 | return 0; | |
1321 | ||
60e453a9 | 1322 | /* reserve one for zero packet */ |
6da2ec56 KC |
1323 | urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist), |
1324 | GFP_ATOMIC); | |
638c5115 ML |
1325 | if (!urb->sg) |
1326 | return -ENOMEM; | |
1327 | ||
1328 | urb->num_sgs = num_sgs; | |
fdc3452c | 1329 | sg_init_table(urb->sg, urb->num_sgs + 1); |
638c5115 ML |
1330 | |
1331 | sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); | |
1332 | total_len += skb_headlen(skb); | |
1333 | ||
1334 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1335 | struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; | |
1336 | ||
1337 | total_len += skb_frag_size(f); | |
1338 | sg_set_page(&urb->sg[i + s], f->page.p, f->size, | |
1339 | f->page_offset); | |
1340 | } | |
1341 | urb->transfer_buffer_length = total_len; | |
1342 | ||
1343 | return 1; | |
1344 | } | |
1345 | ||
25a79c41 SH |
1346 | netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, |
1347 | struct net_device *net) | |
1da177e4 LT |
1348 | { |
1349 | struct usbnet *dev = netdev_priv(net); | |
3e4336a6 | 1350 | unsigned int length; |
1da177e4 LT |
1351 | struct urb *urb = NULL; |
1352 | struct skb_data *entry; | |
f3edc2db | 1353 | const struct driver_info *info = dev->driver_info; |
1da177e4 | 1354 | unsigned long flags; |
25a79c41 | 1355 | int retval; |
1da177e4 | 1356 | |
23ba0799 KK |
1357 | if (skb) |
1358 | skb_tx_timestamp(skb); | |
f9b491ec | 1359 | |
1da177e4 LT |
1360 | // some devices want funky USB-level framing, for |
1361 | // win32 driver (usually) and/or hardware quirks | |
1362 | if (info->tx_fixup) { | |
1363 | skb = info->tx_fixup (dev, skb, GFP_ATOMIC); | |
1364 | if (!skb) { | |
bf414b36 BM |
1365 | /* packet collected; minidriver waiting for more */ |
1366 | if (info->flags & FLAG_MULTI_PACKET) | |
073285fd | 1367 | goto not_drop; |
bf414b36 BM |
1368 | netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); |
1369 | goto drop; | |
1da177e4 LT |
1370 | } |
1371 | } | |
1da177e4 LT |
1372 | |
1373 | if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { | |
a475f603 | 1374 | netif_dbg(dev, tx_err, dev->net, "no urb\n"); |
1da177e4 LT |
1375 | goto drop; |
1376 | } | |
1377 | ||
1378 | entry = (struct skb_data *) skb->cb; | |
1379 | entry->urb = urb; | |
1380 | entry->dev = dev; | |
1da177e4 | 1381 | |
1da177e4 LT |
1382 | usb_fill_bulk_urb (urb, dev->udev, dev->out, |
1383 | skb->data, skb->len, tx_complete, skb); | |
638c5115 ML |
1384 | if (dev->can_dma_sg) { |
1385 | if (build_dma_sg(skb, urb) < 0) | |
1386 | goto drop; | |
1387 | } | |
60e453a9 | 1388 | length = urb->transfer_buffer_length; |
1da177e4 LT |
1389 | |
1390 | /* don't assume the hardware handles USB_ZERO_PACKET | |
1391 | * NOTE: strictly conforming cdc-ether devices should expect | |
1392 | * the ZLP here, but ignore the one-byte packet. | |
073285fd AO |
1393 | * NOTE2: CDC NCM specification is different from CDC ECM when |
1394 | * handling ZLP/short packets, so cdc_ncm driver will make short | |
1395 | * packet itself if needed. | |
1da177e4 | 1396 | */ |
b4d562e3 EP |
1397 | if (length % dev->maxpacket == 0) { |
1398 | if (!(info->flags & FLAG_SEND_ZLP)) { | |
073285fd | 1399 | if (!(info->flags & FLAG_MULTI_PACKET)) { |
60e453a9 ML |
1400 | length++; |
1401 | if (skb_tailroom(skb) && !urb->num_sgs) { | |
073285fd AO |
1402 | skb->data[skb->len] = 0; |
1403 | __skb_put(skb, 1); | |
60e453a9 ML |
1404 | } else if (urb->num_sgs) |
1405 | sg_set_buf(&urb->sg[urb->num_sgs++], | |
1406 | dev->padding_pkt, 1); | |
b4d562e3 EP |
1407 | } |
1408 | } else | |
1409 | urb->transfer_flags |= URB_ZERO_PACKET; | |
3e323f3e | 1410 | } |
7a1e890e BH |
1411 | urb->transfer_buffer_length = length; |
1412 | ||
1413 | if (info->flags & FLAG_MULTI_PACKET) { | |
1414 | /* Driver has set number of packets and a length delta. | |
1415 | * Calculate the complete length and ensure that it's | |
1416 | * positive. | |
1417 | */ | |
1418 | entry->length += length; | |
1419 | if (WARN_ON_ONCE(entry->length <= 0)) | |
1420 | entry->length = length; | |
1421 | } else { | |
1422 | usbnet_set_skb_tx_stats(skb, 1, length); | |
1423 | } | |
1da177e4 | 1424 | |
69ee472f ON |
1425 | spin_lock_irqsave(&dev->txq.lock, flags); |
1426 | retval = usb_autopm_get_interface_async(dev->intf); | |
1427 | if (retval < 0) { | |
1428 | spin_unlock_irqrestore(&dev->txq.lock, flags); | |
1429 | goto drop; | |
1430 | } | |
ad70411a KJ |
1431 | if (netif_queue_stopped(net)) { |
1432 | usb_autopm_put_interface_async(dev->intf); | |
1433 | spin_unlock_irqrestore(&dev->txq.lock, flags); | |
1434 | goto drop; | |
1435 | } | |
69ee472f ON |
1436 | |
1437 | #ifdef CONFIG_PM | |
1438 | /* if this triggers the device is still a sleep */ | |
1439 | if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { | |
1440 | /* transmission will be done in resume */ | |
1441 | usb_anchor_urb(urb, &dev->deferred); | |
1442 | /* no use to process more packets */ | |
1443 | netif_stop_queue(net); | |
39707c2a | 1444 | usb_put_urb(urb); |
69ee472f | 1445 | spin_unlock_irqrestore(&dev->txq.lock, flags); |
60b86755 | 1446 | netdev_dbg(dev->net, "Delaying transmission for resumption\n"); |
69ee472f ON |
1447 | goto deferred; |
1448 | } | |
1449 | #endif | |
1da177e4 | 1450 | |
1da177e4 LT |
1451 | switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { |
1452 | case -EPIPE: | |
1453 | netif_stop_queue (net); | |
2e55cc72 | 1454 | usbnet_defer_kevent (dev, EVENT_TX_HALT); |
69ee472f | 1455 | usb_autopm_put_interface_async(dev->intf); |
1da177e4 LT |
1456 | break; |
1457 | default: | |
69ee472f | 1458 | usb_autopm_put_interface_async(dev->intf); |
a475f603 JP |
1459 | netif_dbg(dev, tx_err, dev->net, |
1460 | "tx: submit urb err %d\n", retval); | |
1da177e4 LT |
1461 | break; |
1462 | case 0: | |
860e9538 | 1463 | netif_trans_update(net); |
5b6e9bcd | 1464 | __usbnet_queue_skb(&dev->txq, skb, tx_start); |
1da177e4 LT |
1465 | if (dev->txq.qlen >= TX_QLEN (dev)) |
1466 | netif_stop_queue (net); | |
1467 | } | |
1468 | spin_unlock_irqrestore (&dev->txq.lock, flags); | |
1469 | ||
1470 | if (retval) { | |
a475f603 | 1471 | netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); |
1da177e4 | 1472 | drop: |
7963837f | 1473 | dev->net->stats.tx_dropped++; |
073285fd | 1474 | not_drop: |
1da177e4 LT |
1475 | if (skb) |
1476 | dev_kfree_skb_any (skb); | |
638c5115 ML |
1477 | if (urb) { |
1478 | kfree(urb->sg); | |
1479 | usb_free_urb(urb); | |
1480 | } | |
a475f603 JP |
1481 | } else |
1482 | netif_dbg(dev, tx_queued, dev->net, | |
3e4336a6 | 1483 | "> tx, len %u, type 0x%x\n", length, skb->protocol); |
69ee472f ON |
1484 | #ifdef CONFIG_PM |
1485 | deferred: | |
1486 | #endif | |
25a79c41 | 1487 | return NETDEV_TX_OK; |
1da177e4 | 1488 | } |
777baa47 | 1489 | EXPORT_SYMBOL_GPL(usbnet_start_xmit); |
1da177e4 | 1490 | |
85e87870 | 1491 | static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) |
65841fd5 ML |
1492 | { |
1493 | struct urb *urb; | |
1494 | int i; | |
85e87870 | 1495 | int ret = 0; |
65841fd5 ML |
1496 | |
1497 | /* don't refill the queue all at once */ | |
1498 | for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { | |
1499 | urb = usb_alloc_urb(0, flags); | |
1500 | if (urb != NULL) { | |
85e87870 BM |
1501 | ret = rx_submit(dev, urb, flags); |
1502 | if (ret) | |
1503 | goto err; | |
1504 | } else { | |
1505 | ret = -ENOMEM; | |
1506 | goto err; | |
65841fd5 ML |
1507 | } |
1508 | } | |
85e87870 BM |
1509 | err: |
1510 | return ret; | |
65841fd5 ML |
1511 | } |
1512 | ||
1da177e4 LT |
1513 | /*-------------------------------------------------------------------------*/ |
1514 | ||
1515 | // tasklet (work deferred from completions, in_irq) or timer | |
1516 | ||
2183c1a6 | 1517 | static void usbnet_bh (struct timer_list *t) |
1da177e4 | 1518 | { |
2183c1a6 | 1519 | struct usbnet *dev = from_timer(dev, t, delay); |
1da177e4 LT |
1520 | struct sk_buff *skb; |
1521 | struct skb_data *entry; | |
1522 | ||
1523 | while ((skb = skb_dequeue (&dev->done))) { | |
1524 | entry = (struct skb_data *) skb->cb; | |
1525 | switch (entry->state) { | |
18ab458f | 1526 | case rx_done: |
1da177e4 LT |
1527 | entry->state = rx_cleanup; |
1528 | rx_process (dev, skb); | |
1529 | continue; | |
18ab458f | 1530 | case tx_done: |
638c5115 | 1531 | kfree(entry->urb->sg); |
2fc4aa59 | 1532 | /* fall through */ |
18ab458f | 1533 | case rx_cleanup: |
1da177e4 LT |
1534 | usb_free_urb (entry->urb); |
1535 | dev_kfree_skb (skb); | |
1536 | continue; | |
18ab458f | 1537 | default: |
60b86755 | 1538 | netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); |
1da177e4 LT |
1539 | } |
1540 | } | |
1541 | ||
70c37bf9 BM |
1542 | /* restart RX again after disabling due to high error rate */ |
1543 | clear_bit(EVENT_RX_KILL, &dev->flags); | |
1544 | ||
14a0d635 ON |
1545 | /* waiting for all pending urbs to complete? |
1546 | * only then can we forgo submitting anew | |
1547 | */ | |
1548 | if (waitqueue_active(&dev->wait)) { | |
1549 | if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) | |
1550 | wake_up_all(&dev->wait); | |
1da177e4 LT |
1551 | |
1552 | // or are we maybe short a few urbs? | |
8e95a202 JP |
1553 | } else if (netif_running (dev->net) && |
1554 | netif_device_present (dev->net) && | |
4b49f58f | 1555 | netif_carrier_ok(dev->net) && |
43daa96b SL |
1556 | !timer_pending(&dev->delay) && |
1557 | !test_bit(EVENT_RX_PAUSED, &dev->flags) && | |
1558 | !test_bit(EVENT_RX_HALT, &dev->flags)) { | |
1da177e4 | 1559 | int temp = dev->rxq.qlen; |
65841fd5 ML |
1560 | |
1561 | if (temp < RX_QLEN(dev)) { | |
85e87870 BM |
1562 | if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) |
1563 | return; | |
a475f603 JP |
1564 | if (temp != dev->rxq.qlen) |
1565 | netif_dbg(dev, link, dev->net, | |
1566 | "rxqlen %d --> %d\n", | |
1567 | temp, dev->rxq.qlen); | |
65841fd5 | 1568 | if (dev->rxq.qlen < RX_QLEN(dev)) |
1da177e4 LT |
1569 | tasklet_schedule (&dev->bh); |
1570 | } | |
1571 | if (dev->txq.qlen < TX_QLEN (dev)) | |
1572 | netif_wake_queue (dev->net); | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | ||
1da177e4 LT |
1577 | /*------------------------------------------------------------------------- |
1578 | * | |
1579 | * USB Device Driver support | |
1580 | * | |
1581 | *-------------------------------------------------------------------------*/ | |
cb1cebbe | 1582 | |
1da177e4 LT |
1583 | // precondition: never called in_interrupt |
1584 | ||
38bde1d4 | 1585 | void usbnet_disconnect (struct usb_interface *intf) |
1da177e4 LT |
1586 | { |
1587 | struct usbnet *dev; | |
1588 | struct usb_device *xdev; | |
1589 | struct net_device *net; | |
1590 | ||
1591 | dev = usb_get_intfdata(intf); | |
1592 | usb_set_intfdata(intf, NULL); | |
1593 | if (!dev) | |
1594 | return; | |
1595 | ||
1596 | xdev = interface_to_usbdev (intf); | |
1597 | ||
a475f603 JP |
1598 | netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", |
1599 | intf->dev.driver->name, | |
1600 | xdev->bus->bus_name, xdev->devpath, | |
1601 | dev->driver_info->description); | |
cb1cebbe | 1602 | |
1da177e4 LT |
1603 | net = dev->net; |
1604 | unregister_netdev (net); | |
1605 | ||
23f333a2 | 1606 | cancel_work_sync(&dev->kevent); |
1da177e4 | 1607 | |
39707c2a HK |
1608 | usb_scuttle_anchored_urbs(&dev->deferred); |
1609 | ||
1da177e4 LT |
1610 | if (dev->driver_info->unbind) |
1611 | dev->driver_info->unbind (dev, intf); | |
1612 | ||
68972efa PS |
1613 | usb_kill_urb(dev->interrupt); |
1614 | usb_free_urb(dev->interrupt); | |
60e453a9 | 1615 | kfree(dev->padding_pkt); |
68972efa | 1616 | |
c8b5d129 | 1617 | free_percpu(dev->stats64); |
1da177e4 | 1618 | free_netdev(net); |
1da177e4 | 1619 | } |
38bde1d4 | 1620 | EXPORT_SYMBOL_GPL(usbnet_disconnect); |
1da177e4 | 1621 | |
777baa47 SH |
1622 | static const struct net_device_ops usbnet_netdev_ops = { |
1623 | .ndo_open = usbnet_open, | |
1624 | .ndo_stop = usbnet_stop, | |
1625 | .ndo_start_xmit = usbnet_start_xmit, | |
1626 | .ndo_tx_timeout = usbnet_tx_timeout, | |
1efed2d0 | 1627 | .ndo_set_rx_mode = usbnet_set_rx_mode, |
777baa47 | 1628 | .ndo_change_mtu = usbnet_change_mtu, |
c8b5d129 | 1629 | .ndo_get_stats64 = usbnet_get_stats64, |
777baa47 SH |
1630 | .ndo_set_mac_address = eth_mac_addr, |
1631 | .ndo_validate_addr = eth_validate_addr, | |
1632 | }; | |
1da177e4 LT |
1633 | |
1634 | /*-------------------------------------------------------------------------*/ | |
1635 | ||
1da177e4 LT |
1636 | // precondition: never called in_interrupt |
1637 | ||
225794f8 MH |
1638 | static struct device_type wlan_type = { |
1639 | .name = "wlan", | |
1640 | }; | |
1641 | ||
1642 | static struct device_type wwan_type = { | |
1643 | .name = "wwan", | |
1644 | }; | |
1645 | ||
38bde1d4 | 1646 | int |
1da177e4 LT |
1647 | usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) |
1648 | { | |
1649 | struct usbnet *dev; | |
cb1cebbe | 1650 | struct net_device *net; |
1da177e4 | 1651 | struct usb_host_interface *interface; |
f3edc2db | 1652 | const struct driver_info *info; |
1da177e4 LT |
1653 | struct usb_device *xdev; |
1654 | int status; | |
296c0242 | 1655 | const char *name; |
b0786b43 ML |
1656 | struct usb_driver *driver = to_usb_driver(udev->dev.driver); |
1657 | ||
1658 | /* usbnet already took usb runtime pm, so have to enable the feature | |
1659 | * for usb interface, otherwise usb_autopm_get_interface may return | |
98f541c6 | 1660 | * failure if RUNTIME_PM is enabled. |
b0786b43 ML |
1661 | */ |
1662 | if (!driver->supports_autosuspend) { | |
1663 | driver->supports_autosuspend = 1; | |
1664 | pm_runtime_enable(&udev->dev); | |
1665 | } | |
1da177e4 | 1666 | |
296c0242 | 1667 | name = udev->dev.driver->name; |
f3edc2db | 1668 | info = (const struct driver_info *) prod->driver_info; |
1da177e4 | 1669 | if (!info) { |
296c0242 | 1670 | dev_dbg (&udev->dev, "blacklisted by %s\n", name); |
1da177e4 LT |
1671 | return -ENODEV; |
1672 | } | |
1673 | xdev = interface_to_usbdev (udev); | |
1674 | interface = udev->cur_altsetting; | |
1675 | ||
1da177e4 LT |
1676 | status = -ENOMEM; |
1677 | ||
1678 | // set up our own records | |
1679 | net = alloc_etherdev(sizeof(*dev)); | |
41de8d4c | 1680 | if (!net) |
1da177e4 | 1681 | goto out; |
1da177e4 | 1682 | |
0dacca73 BH |
1683 | /* netdev_printk() needs this so do it as early as possible */ |
1684 | SET_NETDEV_DEV(net, &udev->dev); | |
1685 | ||
1da177e4 LT |
1686 | dev = netdev_priv(net); |
1687 | dev->udev = xdev; | |
a11a6544 | 1688 | dev->intf = udev; |
1da177e4 | 1689 | dev->driver_info = info; |
296c0242 | 1690 | dev->driver_name = name; |
c8b5d129 GU |
1691 | |
1692 | dev->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
1693 | if (!dev->stats64) | |
1694 | goto out0; | |
1695 | ||
1da177e4 LT |
1696 | dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV |
1697 | | NETIF_MSG_PROBE | NETIF_MSG_LINK); | |
14a0d635 | 1698 | init_waitqueue_head(&dev->wait); |
1da177e4 LT |
1699 | skb_queue_head_init (&dev->rxq); |
1700 | skb_queue_head_init (&dev->txq); | |
1701 | skb_queue_head_init (&dev->done); | |
7834ddbc | 1702 | skb_queue_head_init(&dev->rxq_pause); |
2183c1a6 KC |
1703 | dev->bh.func = (void (*)(unsigned long))usbnet_bh; |
1704 | dev->bh.data = (unsigned long)&dev->delay; | |
11f17ef3 | 1705 | INIT_WORK (&dev->kevent, usbnet_deferred_kevent); |
69ee472f | 1706 | init_usb_anchor(&dev->deferred); |
2183c1a6 | 1707 | timer_setup(&dev->delay, usbnet_bh, 0); |
a9fc6338 | 1708 | mutex_init (&dev->phy_mutex); |
6eecdc5f DW |
1709 | mutex_init(&dev->interrupt_mutex); |
1710 | dev->interrupt_count = 0; | |
1da177e4 | 1711 | |
1da177e4 LT |
1712 | dev->net = net; |
1713 | strcpy (net->name, "usb%d"); | |
1714 | memcpy (net->dev_addr, node_id, sizeof node_id); | |
1715 | ||
2e55cc72 DB |
1716 | /* rx and tx sides can use different message sizes; |
1717 | * bind() should set rx_urb_size in that case. | |
1718 | */ | |
1719 | dev->hard_mtu = net->mtu + net->hard_header_len; | |
f77f0aee JW |
1720 | net->min_mtu = 0; |
1721 | net->max_mtu = ETH_MAX_MTU; | |
1da177e4 | 1722 | |
777baa47 | 1723 | net->netdev_ops = &usbnet_netdev_ops; |
777baa47 | 1724 | net->watchdog_timeo = TX_TIMEOUT_JIFFIES; |
1da177e4 LT |
1725 | net->ethtool_ops = &usbnet_ethtool_ops; |
1726 | ||
1727 | // allow device-specific bind/init procedures | |
1728 | // NOTE net->name still not usable ... | |
1729 | if (info->bind) { | |
1730 | status = info->bind (dev, udev); | |
cb1cebbe DB |
1731 | if (status < 0) |
1732 | goto out1; | |
1733 | ||
1da177e4 LT |
1734 | // heuristic: "usb%d" for links we know are two-host, |
1735 | // else "eth%d" when there's reasonable doubt. userspace | |
1736 | // can rename the link if it knows better. | |
8e95a202 | 1737 | if ((dev->driver_info->flags & FLAG_ETHER) != 0 && |
c261344d AB |
1738 | ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || |
1739 | (net->dev_addr [0] & 0x02) == 0)) | |
1da177e4 | 1740 | strcpy (net->name, "eth%d"); |
6e3bbcc5 JK |
1741 | /* WLAN devices should always be named "wlan%d" */ |
1742 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) | |
1743 | strcpy(net->name, "wlan%d"); | |
e1e499ee MH |
1744 | /* WWAN devices should always be named "wwan%d" */ |
1745 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) | |
1746 | strcpy(net->name, "wwan%d"); | |
f29fc259 | 1747 | |
6509141f WS |
1748 | /* devices that cannot do ARP */ |
1749 | if ((dev->driver_info->flags & FLAG_NOARP) != 0) | |
1750 | net->flags |= IFF_NOARP; | |
1751 | ||
f29fc259 DB |
1752 | /* maybe the remote can't receive an Ethernet MTU */ |
1753 | if (net->mtu > (dev->hard_mtu - net->hard_header_len)) | |
1754 | net->mtu = dev->hard_mtu - net->hard_header_len; | |
2e55cc72 DB |
1755 | } else if (!info->in || !info->out) |
1756 | status = usbnet_get_endpoints (dev, udev); | |
1da177e4 LT |
1757 | else { |
1758 | dev->in = usb_rcvbulkpipe (xdev, info->in); | |
1759 | dev->out = usb_sndbulkpipe (xdev, info->out); | |
1760 | if (!(info->flags & FLAG_NO_SETINT)) | |
1761 | status = usb_set_interface (xdev, | |
1762 | interface->desc.bInterfaceNumber, | |
1763 | interface->desc.bAlternateSetting); | |
1764 | else | |
1765 | status = 0; | |
1766 | ||
1767 | } | |
9514bfe5 | 1768 | if (status >= 0 && dev->status) |
1da177e4 LT |
1769 | status = init_status (dev, udev); |
1770 | if (status < 0) | |
cb1cebbe | 1771 | goto out3; |
1da177e4 | 1772 | |
2e55cc72 DB |
1773 | if (!dev->rx_urb_size) |
1774 | dev->rx_urb_size = dev->hard_mtu; | |
1da177e4 | 1775 | dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); |
cb1cebbe | 1776 | |
eef23b53 BM |
1777 | /* let userspace know we have a random address */ |
1778 | if (ether_addr_equal(net->dev_addr, node_id)) | |
1779 | net->addr_assign_type = NET_ADDR_RANDOM; | |
1780 | ||
225794f8 MH |
1781 | if ((dev->driver_info->flags & FLAG_WLAN) != 0) |
1782 | SET_NETDEV_DEVTYPE(net, &wlan_type); | |
1783 | if ((dev->driver_info->flags & FLAG_WWAN) != 0) | |
1784 | SET_NETDEV_DEVTYPE(net, &wwan_type); | |
1785 | ||
a88c32ae ML |
1786 | /* initialize max rx_qlen and tx_qlen */ |
1787 | usbnet_update_max_qlen(dev); | |
1788 | ||
60e453a9 ML |
1789 | if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && |
1790 | !(info->flags & FLAG_MULTI_PACKET)) { | |
1791 | dev->padding_pkt = kzalloc(1, GFP_KERNEL); | |
09b69024 WY |
1792 | if (!dev->padding_pkt) { |
1793 | status = -ENOMEM; | |
60e453a9 | 1794 | goto out4; |
09b69024 | 1795 | } |
60e453a9 ML |
1796 | } |
1797 | ||
1da177e4 LT |
1798 | status = register_netdev (net); |
1799 | if (status) | |
60e453a9 | 1800 | goto out5; |
a475f603 JP |
1801 | netif_info(dev, probe, dev->net, |
1802 | "register '%s' at usb-%s-%s, %s, %pM\n", | |
1803 | udev->dev.driver->name, | |
1804 | xdev->bus->bus_name, xdev->devpath, | |
1805 | dev->driver_info->description, | |
1806 | net->dev_addr); | |
1da177e4 LT |
1807 | |
1808 | // ok, it's ready to go. | |
1809 | usb_set_intfdata (udev, dev); | |
1810 | ||
1da177e4 LT |
1811 | netif_device_attach (net); |
1812 | ||
37e8273c | 1813 | if (dev->driver_info->flags & FLAG_LINK_INTR) |
0162c554 | 1814 | usbnet_link_change(dev, 0, 0); |
37e8273c | 1815 | |
1da177e4 LT |
1816 | return 0; |
1817 | ||
60e453a9 ML |
1818 | out5: |
1819 | kfree(dev->padding_pkt); | |
a4723848 | 1820 | out4: |
1821 | usb_free_urb(dev->interrupt); | |
1da177e4 LT |
1822 | out3: |
1823 | if (info->unbind) | |
1824 | info->unbind (dev, udev); | |
1825 | out1: | |
1666984c ON |
1826 | /* subdrivers must undo all they did in bind() if they |
1827 | * fail it, but we may fail later and a deferred kevent | |
1828 | * may trigger an error resubmitting itself and, worse, | |
1829 | * schedule a timer. So we kill it all just in case. | |
1830 | */ | |
1831 | cancel_work_sync(&dev->kevent); | |
1832 | del_timer_sync(&dev->delay); | |
c8b5d129 GU |
1833 | free_percpu(dev->stats64); |
1834 | out0: | |
1da177e4 LT |
1835 | free_netdev(net); |
1836 | out: | |
1da177e4 LT |
1837 | return status; |
1838 | } | |
38bde1d4 | 1839 | EXPORT_SYMBOL_GPL(usbnet_probe); |
1da177e4 LT |
1840 | |
1841 | /*-------------------------------------------------------------------------*/ | |
1842 | ||
36433127 ON |
1843 | /* |
1844 | * suspend the whole driver as soon as the first interface is suspended | |
1845 | * resume only when the last interface is resumed | |
38bde1d4 | 1846 | */ |
1da177e4 | 1847 | |
38bde1d4 | 1848 | int usbnet_suspend (struct usb_interface *intf, pm_message_t message) |
1da177e4 LT |
1849 | { |
1850 | struct usbnet *dev = usb_get_intfdata(intf); | |
cb1cebbe | 1851 | |
36433127 | 1852 | if (!dev->suspend_count++) { |
69ee472f ON |
1853 | spin_lock_irq(&dev->txq.lock); |
1854 | /* don't autosuspend while transmitting */ | |
5b1b0b81 | 1855 | if (dev->txq.qlen && PMSG_IS_AUTO(message)) { |
5eeb3132 | 1856 | dev->suspend_count--; |
69ee472f ON |
1857 | spin_unlock_irq(&dev->txq.lock); |
1858 | return -EBUSY; | |
1859 | } else { | |
1860 | set_bit(EVENT_DEV_ASLEEP, &dev->flags); | |
1861 | spin_unlock_irq(&dev->txq.lock); | |
1862 | } | |
a11a6544 ON |
1863 | /* |
1864 | * accelerate emptying of the rx and queues, to avoid | |
36433127 ON |
1865 | * having everything error out. |
1866 | */ | |
1867 | netif_device_detach (dev->net); | |
69ee472f | 1868 | usbnet_terminate_urbs(dev); |
6eecdc5f | 1869 | __usbnet_status_stop_force(dev); |
69ee472f | 1870 | |
a11a6544 ON |
1871 | /* |
1872 | * reattach so runtime management can use and | |
1873 | * wake the device | |
1874 | */ | |
1875 | netif_device_attach (dev->net); | |
36433127 | 1876 | } |
1da177e4 LT |
1877 | return 0; |
1878 | } | |
38bde1d4 | 1879 | EXPORT_SYMBOL_GPL(usbnet_suspend); |
1da177e4 | 1880 | |
38bde1d4 | 1881 | int usbnet_resume (struct usb_interface *intf) |
1da177e4 LT |
1882 | { |
1883 | struct usbnet *dev = usb_get_intfdata(intf); | |
69ee472f ON |
1884 | struct sk_buff *skb; |
1885 | struct urb *res; | |
1886 | int retval; | |
1887 | ||
1888 | if (!--dev->suspend_count) { | |
6eecdc5f DW |
1889 | /* resume interrupt URB if it was previously submitted */ |
1890 | __usbnet_status_start_force(dev, GFP_NOIO); | |
68972efa | 1891 | |
69ee472f ON |
1892 | spin_lock_irq(&dev->txq.lock); |
1893 | while ((res = usb_get_from_anchor(&dev->deferred))) { | |
1894 | ||
69ee472f ON |
1895 | skb = (struct sk_buff *)res->context; |
1896 | retval = usb_submit_urb(res, GFP_ATOMIC); | |
1897 | if (retval < 0) { | |
1898 | dev_kfree_skb_any(skb); | |
638c5115 | 1899 | kfree(res->sg); |
69ee472f ON |
1900 | usb_free_urb(res); |
1901 | usb_autopm_put_interface_async(dev->intf); | |
1902 | } else { | |
860e9538 | 1903 | netif_trans_update(dev->net); |
69ee472f ON |
1904 | __skb_queue_tail(&dev->txq, skb); |
1905 | } | |
1906 | } | |
1da177e4 | 1907 | |
69ee472f ON |
1908 | smp_mb(); |
1909 | clear_bit(EVENT_DEV_ASLEEP, &dev->flags); | |
1910 | spin_unlock_irq(&dev->txq.lock); | |
75bd0cbd ML |
1911 | |
1912 | if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { | |
14a0d635 ON |
1913 | /* handle remote wakeup ASAP |
1914 | * we cannot race against stop | |
1915 | */ | |
1916 | if (netif_device_present(dev->net) && | |
65841fd5 ML |
1917 | !timer_pending(&dev->delay) && |
1918 | !test_bit(EVENT_RX_HALT, &dev->flags)) | |
ab6f148d | 1919 | rx_alloc_submit(dev, GFP_NOIO); |
65841fd5 | 1920 | |
75bd0cbd | 1921 | if (!(dev->txq.qlen >= TX_QLEN(dev))) |
1aa9bc5b | 1922 | netif_tx_wake_all_queues(dev->net); |
75bd0cbd ML |
1923 | tasklet_schedule (&dev->bh); |
1924 | } | |
69ee472f | 1925 | } |
5d9d01a3 ON |
1926 | |
1927 | if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) | |
1928 | usb_autopm_get_interface_no_resume(intf); | |
1929 | ||
1da177e4 LT |
1930 | return 0; |
1931 | } | |
38bde1d4 | 1932 | EXPORT_SYMBOL_GPL(usbnet_resume); |
1da177e4 | 1933 | |
5d9d01a3 ON |
1934 | /* |
1935 | * Either a subdriver implements manage_power, then it is assumed to always | |
1936 | * be ready to be suspended or it reports the readiness to be suspended | |
1937 | * explicitly | |
1938 | */ | |
1939 | void usbnet_device_suggests_idle(struct usbnet *dev) | |
1940 | { | |
1941 | if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { | |
1942 | dev->intf->needs_remote_wakeup = 1; | |
1943 | usb_autopm_put_interface_async(dev->intf); | |
1944 | } | |
1945 | } | |
1946 | EXPORT_SYMBOL(usbnet_device_suggests_idle); | |
1da177e4 | 1947 | |
2dd7c8cf ON |
1948 | /* |
1949 | * For devices that can do without special commands | |
1950 | */ | |
1951 | int usbnet_manage_power(struct usbnet *dev, int on) | |
1952 | { | |
1953 | dev->intf->needs_remote_wakeup = on; | |
1954 | return 0; | |
1955 | } | |
1956 | EXPORT_SYMBOL(usbnet_manage_power); | |
1957 | ||
ac64995d ML |
1958 | void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) |
1959 | { | |
1960 | /* update link after link is reseted */ | |
1961 | if (link && !need_reset) | |
1962 | netif_carrier_on(dev->net); | |
1963 | else | |
1964 | netif_carrier_off(dev->net); | |
1965 | ||
1966 | if (need_reset && link) | |
1967 | usbnet_defer_kevent(dev, EVENT_LINK_RESET); | |
4b49f58f ML |
1968 | else |
1969 | usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); | |
ac64995d ML |
1970 | } |
1971 | EXPORT_SYMBOL(usbnet_link_change); | |
1972 | ||
877bd862 | 1973 | /*-------------------------------------------------------------------------*/ |
0547fad2 ML |
1974 | static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, |
1975 | u16 value, u16 index, void *data, u16 size) | |
877bd862 ML |
1976 | { |
1977 | void *buf = NULL; | |
1978 | int err = -ENOMEM; | |
1979 | ||
1980 | netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" | |
1981 | " value=0x%04x index=0x%04x size=%d\n", | |
1982 | cmd, reqtype, value, index, size); | |
1983 | ||
6c22fce0 | 1984 | if (size) { |
877bd862 ML |
1985 | buf = kmalloc(size, GFP_KERNEL); |
1986 | if (!buf) | |
1987 | goto out; | |
1988 | } | |
1989 | ||
1990 | err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), | |
1991 | cmd, reqtype, value, index, buf, size, | |
1992 | USB_CTRL_GET_TIMEOUT); | |
6c22fce0 ON |
1993 | if (err > 0 && err <= size) { |
1994 | if (data) | |
1995 | memcpy(data, buf, err); | |
1996 | else | |
1997 | netdev_dbg(dev->net, | |
1998 | "Huh? Data requested but thrown away.\n"); | |
1999 | } | |
877bd862 ML |
2000 | kfree(buf); |
2001 | out: | |
2002 | return err; | |
2003 | } | |
877bd862 | 2004 | |
0547fad2 ML |
2005 | static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, |
2006 | u16 value, u16 index, const void *data, | |
2007 | u16 size) | |
877bd862 ML |
2008 | { |
2009 | void *buf = NULL; | |
2010 | int err = -ENOMEM; | |
2011 | ||
2012 | netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" | |
2013 | " value=0x%04x index=0x%04x size=%d\n", | |
2014 | cmd, reqtype, value, index, size); | |
2015 | ||
2016 | if (data) { | |
2017 | buf = kmemdup(data, size, GFP_KERNEL); | |
2018 | if (!buf) | |
2019 | goto out; | |
6c22fce0 ON |
2020 | } else { |
2021 | if (size) { | |
2022 | WARN_ON_ONCE(1); | |
2023 | err = -EINVAL; | |
2024 | goto out; | |
2025 | } | |
2026 | } | |
877bd862 ML |
2027 | |
2028 | err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), | |
2029 | cmd, reqtype, value, index, buf, size, | |
2030 | USB_CTRL_SET_TIMEOUT); | |
2031 | kfree(buf); | |
2032 | ||
2033 | out: | |
2034 | return err; | |
2035 | } | |
0547fad2 ML |
2036 | |
2037 | /* | |
2038 | * The function can't be called inside suspend/resume callback, | |
2039 | * otherwise deadlock will be caused. | |
2040 | */ | |
2041 | int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, | |
2042 | u16 value, u16 index, void *data, u16 size) | |
2043 | { | |
6f0a0986 ML |
2044 | int ret; |
2045 | ||
2046 | if (usb_autopm_get_interface(dev->intf) < 0) | |
2047 | return -ENODEV; | |
2048 | ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, | |
2049 | data, size); | |
2050 | usb_autopm_put_interface(dev->intf); | |
2051 | return ret; | |
0547fad2 ML |
2052 | } |
2053 | EXPORT_SYMBOL_GPL(usbnet_read_cmd); | |
2054 | ||
2055 | /* | |
2056 | * The function can't be called inside suspend/resume callback, | |
2057 | * otherwise deadlock will be caused. | |
2058 | */ | |
2059 | int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, | |
2060 | u16 value, u16 index, const void *data, u16 size) | |
2061 | { | |
6f0a0986 ML |
2062 | int ret; |
2063 | ||
2064 | if (usb_autopm_get_interface(dev->intf) < 0) | |
2065 | return -ENODEV; | |
2066 | ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, | |
2067 | data, size); | |
2068 | usb_autopm_put_interface(dev->intf); | |
2069 | return ret; | |
0547fad2 | 2070 | } |
877bd862 ML |
2071 | EXPORT_SYMBOL_GPL(usbnet_write_cmd); |
2072 | ||
0547fad2 ML |
2073 | /* |
2074 | * The function can be called inside suspend/resume callback safely | |
2075 | * and should only be called by suspend/resume callback generally. | |
2076 | */ | |
2077 | int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, | |
2078 | u16 value, u16 index, void *data, u16 size) | |
2079 | { | |
2080 | return __usbnet_read_cmd(dev, cmd, reqtype, value, index, | |
2081 | data, size); | |
2082 | } | |
2083 | EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); | |
2084 | ||
2085 | /* | |
2086 | * The function can be called inside suspend/resume callback safely | |
2087 | * and should only be called by suspend/resume callback generally. | |
2088 | */ | |
2089 | int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, | |
2090 | u16 value, u16 index, const void *data, | |
2091 | u16 size) | |
2092 | { | |
2093 | return __usbnet_write_cmd(dev, cmd, reqtype, value, index, | |
2094 | data, size); | |
2095 | } | |
2096 | EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); | |
2097 | ||
877bd862 ML |
2098 | static void usbnet_async_cmd_cb(struct urb *urb) |
2099 | { | |
2100 | struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; | |
2101 | int status = urb->status; | |
2102 | ||
2103 | if (status < 0) | |
2104 | dev_dbg(&urb->dev->dev, "%s failed with %d", | |
2105 | __func__, status); | |
2106 | ||
2107 | kfree(req); | |
2108 | usb_free_urb(urb); | |
2109 | } | |
2110 | ||
0547fad2 ML |
2111 | /* |
2112 | * The caller must make sure that device can't be put into suspend | |
2113 | * state until the control URB completes. | |
2114 | */ | |
877bd862 ML |
2115 | int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, |
2116 | u16 value, u16 index, const void *data, u16 size) | |
2117 | { | |
2118 | struct usb_ctrlrequest *req = NULL; | |
2119 | struct urb *urb; | |
2120 | int err = -ENOMEM; | |
2121 | void *buf = NULL; | |
2122 | ||
2123 | netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" | |
2124 | " value=0x%04x index=0x%04x size=%d\n", | |
2125 | cmd, reqtype, value, index, size); | |
2126 | ||
2127 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
ef6cd130 | 2128 | if (!urb) |
877bd862 | 2129 | goto fail; |
877bd862 ML |
2130 | |
2131 | if (data) { | |
2132 | buf = kmemdup(data, size, GFP_ATOMIC); | |
2133 | if (!buf) { | |
2134 | netdev_err(dev->net, "Error allocating buffer" | |
2135 | " in %s!\n", __func__); | |
2136 | goto fail_free; | |
2137 | } | |
2138 | } | |
2139 | ||
2140 | req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); | |
38673c82 | 2141 | if (!req) |
877bd862 | 2142 | goto fail_free_buf; |
877bd862 ML |
2143 | |
2144 | req->bRequestType = reqtype; | |
2145 | req->bRequest = cmd; | |
2146 | req->wValue = cpu_to_le16(value); | |
2147 | req->wIndex = cpu_to_le16(index); | |
2148 | req->wLength = cpu_to_le16(size); | |
2149 | ||
2150 | usb_fill_control_urb(urb, dev->udev, | |
2151 | usb_sndctrlpipe(dev->udev, 0), | |
2152 | (void *)req, buf, size, | |
2153 | usbnet_async_cmd_cb, req); | |
2154 | urb->transfer_flags |= URB_FREE_BUFFER; | |
2155 | ||
2156 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
2157 | if (err < 0) { | |
2158 | netdev_err(dev->net, "Error submitting the control" | |
2159 | " message: status=%d\n", err); | |
2160 | goto fail_free; | |
2161 | } | |
2162 | return 0; | |
2163 | ||
2164 | fail_free_buf: | |
2165 | kfree(buf); | |
2166 | fail_free: | |
2167 | kfree(req); | |
2168 | usb_free_urb(urb); | |
2169 | fail: | |
2170 | return err; | |
2171 | ||
2172 | } | |
2173 | EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); | |
1da177e4 LT |
2174 | /*-------------------------------------------------------------------------*/ |
2175 | ||
f29fc259 | 2176 | static int __init usbnet_init(void) |
1da177e4 | 2177 | { |
c582a950 TF |
2178 | /* Compiler should optimize this out. */ |
2179 | BUILD_BUG_ON( | |
2180 | FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); | |
1da177e4 | 2181 | |
c7e12ead | 2182 | eth_random_addr(node_id); |
cb1cebbe | 2183 | return 0; |
1da177e4 | 2184 | } |
f29fc259 | 2185 | module_init(usbnet_init); |
1da177e4 | 2186 | |
f29fc259 | 2187 | static void __exit usbnet_exit(void) |
1da177e4 | 2188 | { |
1da177e4 | 2189 | } |
f29fc259 | 2190 | module_exit(usbnet_exit); |
1da177e4 | 2191 | |
f29fc259 | 2192 | MODULE_AUTHOR("David Brownell"); |
090ffa9d | 2193 | MODULE_DESCRIPTION("USB network driver framework"); |
f29fc259 | 2194 | MODULE_LICENSE("GPL"); |