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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / usb / usbnet.c
blob5ec97def35138cb48487fab93a3e18002c934a63
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * USB Network driver infrastructure
4 * Copyright (C) 2000-2005 by David Brownell
5 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
6 */
7
8 /*
9 * This is a generic "USB networking" framework that works with several
10 * kinds of full and high speed networking devices: host-to-host cables,
11 * smart usb peripherals, and actual Ethernet adapters.
12 *
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 */
19
20 // #define DEBUG // error path messages, extra info
21 // #define VERBOSE // more; success messages
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ctype.h>
28 #include <linux/ethtool.h>
29 #include <linux/workqueue.h>
30 #include <linux/mii.h>
31 #include <linux/usb.h>
32 #include <linux/usb/usbnet.h>
33 #include <linux/slab.h>
34 #include <linux/kernel.h>
35 #include <linux/pm_runtime.h>
36
37 #define DRIVER_VERSION "22-Aug-2005"
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).
48 *
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.
52 */
53 #define MAX_QUEUE_MEMORY (60 * 1518)
54 #define RX_QLEN(dev) ((dev)->rx_qlen)
55 #define TX_QLEN(dev) ((dev)->tx_qlen)
56
57 // reawaken network queue this soon after stopping; else watchdog barks
58 #define TX_TIMEOUT_JIFFIES (5*HZ)
59
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 */
63 #define THROTTLE_JIFFIES (HZ/8)
64
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
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
78 /*-------------------------------------------------------------------------*/
79
80 /* handles CDC Ethernet and many other network "bulk data" interfaces */
81 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
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;
96 * ignore other endpoints and altsettings.
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;
103
104 /* ignore endpoints which cannot transfer data */
105 if (!usb_endpoint_maxp(&e->desc))
106 continue;
107
108 switch (e->desc.bmAttributes) {
109 case USB_ENDPOINT_XFER_INT:
110 if (!usb_endpoint_dir_in(&e->desc))
111 continue;
112 intr = 1;
113 /* FALLTHROUGH */
114 case USB_ENDPOINT_XFER_BULK:
115 break;
116 default:
117 continue;
118 }
119 if (usb_endpoint_dir_in(&e->desc)) {
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
135 if (alt->desc.bAlternateSetting != 0 ||
136 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
137 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
138 alt->desc.bAlternateSetting);
139 if (tmp < 0)
140 return tmp;
141 }
142
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 }
150 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
151
152 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
153 {
154 int tmp = -1, ret;
155 unsigned char buf [13];
156
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) {
161 dev_dbg(&dev->udev->dev,
162 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
163 if (ret >= 0)
164 ret = -EINVAL;
165 return ret;
166 }
167 return 0;
168 }
169 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
170
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
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 }
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
222 buf = kmalloc (maxp, GFP_KERNEL);
223 if (buf) {
224 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
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);
231 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
232 dev_dbg(&intf->dev,
233 "status ep%din, %d bytes period %d\n",
234 usb_pipeendpoint(pipe), maxp, period);
235 }
236 }
237 return 0;
238 }
239
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
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)
309 {
310 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64);
311 unsigned long flags;
312 int status;
313
314 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
315 skb_queue_tail(&dev->rxq_pause, skb);
316 return;
317 }
318
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
323 flags = u64_stats_update_begin_irqsave(&stats64->syncp);
324 stats64->rx_packets++;
325 stats64->rx_bytes += skb->len;
326 u64_stats_update_end_irqrestore(&stats64->syncp, flags);
327
328 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
329 skb->len + sizeof (struct ethhdr), skb->protocol);
330 memset (skb->cb, 0, sizeof (struct skb_data));
331
332 if (skb_defer_rx_timestamp(skb))
333 return;
334
335 status = netif_rx (skb);
336 if (status != NET_RX_SUCCESS)
337 netif_dbg(dev, rx_err, dev->net,
338 "netif_rx status %d\n", status);
339 }
340 EXPORT_SYMBOL_GPL(usbnet_skb_return);
341
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
347 if (!dev->rx_urb_size || !dev->hard_mtu)
348 goto insanity;
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;
354 case USB_SPEED_SUPER:
355 case USB_SPEED_SUPER_PLUS:
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;
364 default:
365 insanity:
366 dev->rx_qlen = dev->tx_qlen = 4;
367 }
368 }
369 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
370
371 \f
372 /*-------------------------------------------------------------------------
373 *
374 * Network Device Driver (peer link to "Host Device", from USB host)
375 *
376 *-------------------------------------------------------------------------*/
377
378 int usbnet_change_mtu (struct net_device *net, int new_mtu)
379 {
380 struct usbnet *dev = netdev_priv(net);
381 int ll_mtu = new_mtu + net->hard_header_len;
382 int old_hard_mtu = dev->hard_mtu;
383 int old_rx_urb_size = dev->rx_urb_size;
384
385 // no second zero-length packet read wanted after mtu-sized packets
386 if ((ll_mtu % dev->maxpacket) == 0)
387 return -EDOM;
388 net->mtu = new_mtu;
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;
393 if (dev->rx_urb_size > old_rx_urb_size) {
394 usbnet_pause_rx(dev);
395 usbnet_unlink_rx_urbs(dev);
396 usbnet_resume_rx(dev);
397 }
398 }
399
400 /* max qlen depend on hard_mtu and rx_urb_size */
401 usbnet_update_max_qlen(dev);
402
403 return 0;
404 }
405 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
406
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
417 /*-------------------------------------------------------------------------*/
418
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
423 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
424 struct sk_buff_head *list, enum skb_state state)
425 {
426 unsigned long flags;
427 enum skb_state old_state;
428 struct skb_data *entry = (struct skb_data *) skb->cb;
429
430 spin_lock_irqsave(&list->lock, flags);
431 old_state = entry->state;
432 entry->state = state;
433 __skb_unlink(skb, list);
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
441 __skb_queue_tail(&dev->done, skb);
442 if (dev->done.qlen == 1)
443 tasklet_schedule(&dev->bh);
444 spin_unlock(&dev->done.lock);
445 spin_unlock_irqrestore(&list->lock, flags);
446 return old_state;
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 */
454 void usbnet_defer_kevent (struct usbnet *dev, int work)
455 {
456 set_bit (work, &dev->flags);
457 if (!schedule_work (&dev->kevent))
458 netdev_dbg(dev->net, "kevent %d may have been dropped\n", work);
459 else
460 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
461 }
462 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
463
464 /*-------------------------------------------------------------------------*/
465
466 static void rx_complete (struct urb *urb);
467
468 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
469 {
470 struct sk_buff *skb;
471 struct skb_data *entry;
472 int retval = 0;
473 unsigned long lockflags;
474 size_t size = dev->rx_urb_size;
475
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
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);
486 if (!skb) {
487 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
488 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
489 usb_free_urb (urb);
490 return -ENOMEM;
491 }
492
493 entry = (struct skb_data *) skb->cb;
494 entry->urb = urb;
495 entry->dev = dev;
496 entry->length = 0;
497
498 usb_fill_bulk_urb (urb, dev->udev, dev->in,
499 skb->data, size, rx_complete, skb);
500
501 spin_lock_irqsave (&dev->rxq.lock, lockflags);
502
503 if (netif_running (dev->net) &&
504 netif_device_present (dev->net) &&
505 test_bit(EVENT_DEV_OPEN, &dev->flags) &&
506 !test_bit (EVENT_RX_HALT, &dev->flags) &&
507 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
508 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
509 case -EPIPE:
510 usbnet_defer_kevent (dev, EVENT_RX_HALT);
511 break;
512 case -ENOMEM:
513 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
514 break;
515 case -ENODEV:
516 netif_dbg(dev, ifdown, dev->net, "device gone\n");
517 netif_device_detach (dev->net);
518 break;
519 case -EHOSTUNREACH:
520 retval = -ENOLINK;
521 break;
522 default:
523 netif_dbg(dev, rx_err, dev->net,
524 "rx submit, %d\n", retval);
525 tasklet_schedule (&dev->bh);
526 break;
527 case 0:
528 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
529 }
530 } else {
531 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
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 }
539 return retval;
540 }
541
542
543 /*-------------------------------------------------------------------------*/
544
545 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
546 {
547 if (dev->driver_info->rx_fixup &&
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 }
554 // else network stack removes extra byte if we forced a short packet
555
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);
566 return;
567 }
568
569 done:
570 skb_queue_tail(&dev->done, skb);
571 }
572
573 /*-------------------------------------------------------------------------*/
574
575 static void rx_complete (struct urb *urb)
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;
581 enum skb_state state;
582
583 skb_put (skb, urb->actual_length);
584 state = rx_done;
585 entry->urb = NULL;
586
587 switch (urb_status) {
588 /* success */
589 case 0:
590 break;
591
592 /* stalls need manual reset. this is rare ... except that
593 * when going through USB 2.0 TTs, unplug appears this way.
594 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
595 * storm, recovering as needed.
596 */
597 case -EPIPE:
598 dev->net->stats.rx_errors++;
599 usbnet_defer_kevent (dev, EVENT_RX_HALT);
600 // FALLTHROUGH
601
602 /* software-driven interface shutdown */
603 case -ECONNRESET: /* async unlink */
604 case -ESHUTDOWN: /* hardware gone */
605 netif_dbg(dev, ifdown, dev->net,
606 "rx shutdown, code %d\n", urb_status);
607 goto block;
608
609 /* we get controller i/o faults during hub_wq disconnect() delays.
610 * throttle down resubmits, to avoid log floods; just temporarily,
611 * so we still recover when the fault isn't a hub_wq delay.
612 */
613 case -EPROTO:
614 case -ETIME:
615 case -EILSEQ:
616 dev->net->stats.rx_errors++;
617 if (!timer_pending (&dev->delay)) {
618 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
619 netif_dbg(dev, link, dev->net,
620 "rx throttle %d\n", urb_status);
621 }
622 block:
623 state = rx_cleanup;
624 entry->urb = urb;
625 urb = NULL;
626 break;
627
628 /* data overrun ... flush fifo? */
629 case -EOVERFLOW:
630 dev->net->stats.rx_over_errors++;
631 // FALLTHROUGH
632
633 default:
634 state = rx_cleanup;
635 dev->net->stats.rx_errors++;
636 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
637 break;
638 }
639
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
651 state = defer_bh(dev, skb, &dev->rxq, state);
652
653 if (urb) {
654 if (netif_running (dev->net) &&
655 !test_bit (EVENT_RX_HALT, &dev->flags) &&
656 state != unlink_start) {
657 rx_submit (dev, urb, GFP_ATOMIC);
658 usb_mark_last_busy(dev->udev);
659 return;
660 }
661 usb_free_urb (urb);
662 }
663 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
664 }
665
666 /*-------------------------------------------------------------------------*/
667 void usbnet_pause_rx(struct usbnet *dev)
668 {
669 set_bit(EVENT_RX_PAUSED, &dev->flags);
670
671 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
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
689 netif_dbg(dev, rx_status, dev->net,
690 "paused rx queue disabled, %d skbs requeued\n", num);
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
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;
707 struct sk_buff *skb;
708 int count = 0;
709
710 spin_lock_irqsave (&q->lock, flags);
711 while (!skb_queue_empty(q)) {
712 struct skb_data *entry;
713 struct urb *urb;
714 int retval;
715
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;
724 urb = entry->urb;
725
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);
734 spin_unlock_irqrestore(&q->lock, flags);
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)
739 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
740 else
741 count++;
742 usb_put_urb(urb);
743 spin_lock_irqsave(&q->lock, flags);
744 }
745 spin_unlock_irqrestore (&q->lock, flags);
746 return count;
747 }
748
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);
760
761 /*-------------------------------------------------------------------------*/
762
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
777 // precondition: never called in_interrupt
778 static void usbnet_terminate_urbs(struct usbnet *dev)
779 {
780 DECLARE_WAITQUEUE(wait, current);
781 int temp;
782
783 /* ensure there are no more active urbs */
784 add_wait_queue(&dev->wait, &wait);
785 set_current_state(TASK_UNINTERRUPTIBLE);
786 temp = unlink_urbs(dev, &dev->txq) +
787 unlink_urbs(dev, &dev->rxq);
788
789 /* maybe wait for deletions to finish. */
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);
795 set_current_state(TASK_RUNNING);
796 remove_wait_queue(&dev->wait, &wait);
797 }
798
799 int usbnet_stop (struct net_device *net)
800 {
801 struct usbnet *dev = netdev_priv(net);
802 const struct driver_info *info = dev->driver_info;
803 int retval, pm, mpn;
804
805 clear_bit(EVENT_DEV_OPEN, &dev->flags);
806 netif_stop_queue (net);
807
808 netif_info(dev, ifdown, dev->net,
809 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
810 net->stats.rx_packets, net->stats.tx_packets,
811 net->stats.rx_errors, net->stats.tx_errors);
812
813 /* to not race resume */
814 pm = usb_autopm_get_interface(dev->intf);
815 /* allow minidriver to stop correctly (wireless devices to turn off
816 * radio etc) */
817 if (info->stop) {
818 retval = info->stop(dev);
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);
825 }
826
827 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
828 usbnet_terminate_urbs(dev);
829
830 usbnet_status_stop(dev);
831
832 usbnet_purge_paused_rxq(dev);
833
834 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
835
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);
843 if (!pm)
844 usb_autopm_put_interface(dev->intf);
845
846 if (info->manage_power && mpn)
847 info->manage_power(dev, 0);
848 else
849 usb_autopm_put_interface(dev->intf);
850
851 return 0;
852 }
853 EXPORT_SYMBOL_GPL(usbnet_stop);
854
855 /*-------------------------------------------------------------------------*/
856
857 // posts reads, and enables write queuing
858
859 // precondition: never called in_interrupt
860
861 int usbnet_open (struct net_device *net)
862 {
863 struct usbnet *dev = netdev_priv(net);
864 int retval;
865 const struct driver_info *info = dev->driver_info;
866
867 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
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);
874 goto done_nopm;
875 }
876
877 // put into "known safe" state
878 if (info->reset && (retval = info->reset (dev)) < 0) {
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);
885 goto done;
886 }
887
888 /* hard_mtu or rx_urb_size may change in reset() */
889 usbnet_update_max_qlen(dev);
890
891 // insist peer be connected
892 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
893 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
894 goto done;
895 }
896
897 /* start any status interrupt transfer */
898 if (dev->interrupt) {
899 retval = usbnet_status_start(dev, GFP_KERNEL);
900 if (retval < 0) {
901 netif_err(dev, ifup, dev->net,
902 "intr submit %d\n", retval);
903 goto done;
904 }
905 }
906
907 set_bit(EVENT_DEV_OPEN, &dev->flags);
908 netif_start_queue (net);
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");
919
920 /* reset rx error state */
921 dev->pkt_cnt = 0;
922 dev->pkt_err = 0;
923 clear_bit(EVENT_RX_KILL, &dev->flags);
924
925 // delay posting reads until we're fully open
926 tasklet_schedule (&dev->bh);
927 if (info->manage_power) {
928 retval = info->manage_power(dev, 1);
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 }
935 }
936 return retval;
937 done:
938 usb_autopm_put_interface(dev->intf);
939 done_nopm:
940 return retval;
941 }
942 EXPORT_SYMBOL_GPL(usbnet_open);
943
944 /*-------------------------------------------------------------------------*/
945
946 /* ethtool methods; minidrivers may need to add some more, but
947 * they'll probably want to use this base set.
948 */
949
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
958 mii_ethtool_get_link_ksettings(&dev->mii, cmd);
959
960 return 0;
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
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
1017 u32 usbnet_get_link (struct net_device *net)
1018 {
1019 struct usbnet *dev = netdev_priv(net);
1020
1021 /* If a check_connect is defined, return its result */
1022 if (dev->driver_info->check_connect)
1023 return dev->driver_info->check_connect (dev) == 0;
1024
1025 /* if the device has mii operations, use those */
1026 if (dev->mii.mdio_read)
1027 return mii_link_ok(&dev->mii);
1028
1029 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
1030 return ethtool_op_get_link(net);
1031 }
1032 EXPORT_SYMBOL_GPL(usbnet_get_link);
1033
1034 int usbnet_nway_reset(struct net_device *net)
1035 {
1036 struct usbnet *dev = netdev_priv(net);
1037
1038 if (!dev->mii.mdio_write)
1039 return -EOPNOTSUPP;
1040
1041 return mii_nway_restart(&dev->mii);
1042 }
1043 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1044
1045 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1046 {
1047 struct usbnet *dev = netdev_priv(net);
1048
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,
1052 sizeof info->fw_version);
1053 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1054 }
1055 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1056
1057 u32 usbnet_get_msglevel (struct net_device *net)
1058 {
1059 struct usbnet *dev = netdev_priv(net);
1060
1061 return dev->msg_enable;
1062 }
1063 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1064
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;
1070 }
1071 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1072
1073 /* drivers may override default ethtool_ops in their bind() routine */
1074 static const struct ethtool_ops usbnet_ethtool_ops = {
1075 .get_link = usbnet_get_link,
1076 .nway_reset = usbnet_nway_reset,
1077 .get_drvinfo = usbnet_get_drvinfo,
1078 .get_msglevel = usbnet_get_msglevel,
1079 .set_msglevel = usbnet_set_msglevel,
1080 .get_ts_info = ethtool_op_get_ts_info,
1081 .get_link_ksettings = usbnet_get_link_ksettings,
1082 .set_link_ksettings = usbnet_set_link_ksettings,
1083 };
1084
1085 /*-------------------------------------------------------------------------*/
1086
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
1105 /* hard_mtu or rx_urb_size may change during link change */
1106 usbnet_update_max_qlen(dev);
1107
1108 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1109 }
1110
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
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
1132 usbnet_deferred_kevent (struct work_struct *work)
1133 {
1134 struct usbnet *dev =
1135 container_of(work, struct usbnet, kevent);
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);
1141 status = usb_autopm_get_interface(dev->intf);
1142 if (status < 0)
1143 goto fail_pipe;
1144 status = usb_clear_halt (dev->udev, dev->out);
1145 usb_autopm_put_interface(dev->intf);
1146 if (status < 0 &&
1147 status != -EPIPE &&
1148 status != -ESHUTDOWN) {
1149 if (netif_msg_tx_err (dev))
1150 fail_pipe:
1151 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1152 status);
1153 } else {
1154 clear_bit (EVENT_TX_HALT, &dev->flags);
1155 if (status != -ESHUTDOWN)
1156 netif_wake_queue (dev->net);
1157 }
1158 }
1159 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1160 unlink_urbs (dev, &dev->rxq);
1161 status = usb_autopm_get_interface(dev->intf);
1162 if (status < 0)
1163 goto fail_halt;
1164 status = usb_clear_halt (dev->udev, dev->in);
1165 usb_autopm_put_interface(dev->intf);
1166 if (status < 0 &&
1167 status != -EPIPE &&
1168 status != -ESHUTDOWN) {
1169 if (netif_msg_rx_err (dev))
1170 fail_halt:
1171 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1172 status);
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;
1182 int resched = 1;
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);
1190 status = usb_autopm_get_interface(dev->intf);
1191 if (status < 0) {
1192 usb_free_urb(urb);
1193 goto fail_lowmem;
1194 }
1195 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1196 resched = 0;
1197 usb_autopm_put_interface(dev->intf);
1198 fail_lowmem:
1199 if (resched)
1200 tasklet_schedule (&dev->bh);
1201 }
1202 }
1203
1204 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1205 const struct driver_info *info = dev->driver_info;
1206 int retval = 0;
1207
1208 clear_bit (EVENT_LINK_RESET, &dev->flags);
1209 status = usb_autopm_get_interface(dev->intf);
1210 if (status < 0)
1211 goto skip_reset;
1212 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1213 usb_autopm_put_interface(dev->intf);
1214 skip_reset:
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);
1220 } else {
1221 usb_autopm_put_interface(dev->intf);
1222 }
1223
1224 /* handle link change from link resetting */
1225 __handle_link_change(dev);
1226 }
1227
1228 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1229 __handle_link_change(dev);
1230
1231 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1232 __handle_set_rx_mode(dev);
1233
1234
1235 if (dev->flags)
1236 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1237 }
1238
1239 /*-------------------------------------------------------------------------*/
1240
1241 static void tx_complete (struct urb *urb)
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) {
1248 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64);
1249 unsigned long flags;
1250
1251 flags = u64_stats_update_begin_irqsave(&stats64->syncp);
1252 stats64->tx_packets += entry->packets;
1253 stats64->tx_bytes += entry->length;
1254 u64_stats_update_end_irqrestore(&stats64->syncp, flags);
1255 } else {
1256 dev->net->stats.tx_errors++;
1257
1258 switch (urb->status) {
1259 case -EPIPE:
1260 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1261 break;
1262
1263 /* software-driven interface shutdown */
1264 case -ECONNRESET: // async unlink
1265 case -ESHUTDOWN: // hardware gone
1266 break;
1267
1268 /* like rx, tx gets controller i/o faults during hub_wq
1269 * delays and so it uses the same throttling mechanism.
1270 */
1271 case -EPROTO:
1272 case -ETIME:
1273 case -EILSEQ:
1274 usb_mark_last_busy(dev->udev);
1275 if (!timer_pending (&dev->delay)) {
1276 mod_timer (&dev->delay,
1277 jiffies + THROTTLE_JIFFIES);
1278 netif_dbg(dev, link, dev->net,
1279 "tx throttle %d\n", urb->status);
1280 }
1281 netif_stop_queue (dev->net);
1282 break;
1283 default:
1284 netif_dbg(dev, tx_err, dev->net,
1285 "tx err %d\n", entry->urb->status);
1286 break;
1287 }
1288 }
1289
1290 usb_autopm_put_interface_async(dev->intf);
1291 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1292 }
1293
1294 /*-------------------------------------------------------------------------*/
1295
1296 void usbnet_tx_timeout (struct net_device *net, unsigned int txqueue)
1297 {
1298 struct usbnet *dev = netdev_priv(net);
1299
1300 unlink_urbs (dev, &dev->txq);
1301 tasklet_schedule (&dev->bh);
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);
1308 }
1309 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1310
1311 /*-------------------------------------------------------------------------*/
1312
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
1322 /* reserve one for zero packet */
1323 urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist),
1324 GFP_ATOMIC);
1325 if (!urb->sg)
1326 return -ENOMEM;
1327
1328 urb->num_sgs = num_sgs;
1329 sg_init_table(urb->sg, urb->num_sgs + 1);
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 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1336
1337 total_len += skb_frag_size(f);
1338 sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f),
1339 skb_frag_off(f));
1340 }
1341 urb->transfer_buffer_length = total_len;
1342
1343 return 1;
1344 }
1345
1346 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1347 struct net_device *net)
1348 {
1349 struct usbnet *dev = netdev_priv(net);
1350 unsigned int length;
1351 struct urb *urb = NULL;
1352 struct skb_data *entry;
1353 const struct driver_info *info = dev->driver_info;
1354 unsigned long flags;
1355 int retval;
1356
1357 if (skb)
1358 skb_tx_timestamp(skb);
1359
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) {
1365 /* packet collected; minidriver waiting for more */
1366 if (info->flags & FLAG_MULTI_PACKET)
1367 goto not_drop;
1368 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1369 goto drop;
1370 }
1371 }
1372
1373 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1374 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1375 goto drop;
1376 }
1377
1378 entry = (struct skb_data *) skb->cb;
1379 entry->urb = urb;
1380 entry->dev = dev;
1381
1382 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1383 skb->data, skb->len, tx_complete, skb);
1384 if (dev->can_dma_sg) {
1385 if (build_dma_sg(skb, urb) < 0)
1386 goto drop;
1387 }
1388 length = urb->transfer_buffer_length;
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.
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.
1396 */
1397 if (length % dev->maxpacket == 0) {
1398 if (!(info->flags & FLAG_SEND_ZLP)) {
1399 if (!(info->flags & FLAG_MULTI_PACKET)) {
1400 length++;
1401 if (skb_tailroom(skb) && !urb->num_sgs) {
1402 skb->data[skb->len] = 0;
1403 __skb_put(skb, 1);
1404 } else if (urb->num_sgs)
1405 sg_set_buf(&urb->sg[urb->num_sgs++],
1406 dev->padding_pkt, 1);
1407 }
1408 } else
1409 urb->transfer_flags |= URB_ZERO_PACKET;
1410 }
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 }
1424
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 }
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 }
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);
1444 usb_put_urb(urb);
1445 spin_unlock_irqrestore(&dev->txq.lock, flags);
1446 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1447 goto deferred;
1448 }
1449 #endif
1450
1451 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1452 case -EPIPE:
1453 netif_stop_queue (net);
1454 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1455 usb_autopm_put_interface_async(dev->intf);
1456 break;
1457 default:
1458 usb_autopm_put_interface_async(dev->intf);
1459 netif_dbg(dev, tx_err, dev->net,
1460 "tx: submit urb err %d\n", retval);
1461 break;
1462 case 0:
1463 netif_trans_update(net);
1464 __usbnet_queue_skb(&dev->txq, skb, tx_start);
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) {
1471 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1472 drop:
1473 dev->net->stats.tx_dropped++;
1474 not_drop:
1475 if (skb)
1476 dev_kfree_skb_any (skb);
1477 if (urb) {
1478 kfree(urb->sg);
1479 usb_free_urb(urb);
1480 }
1481 } else
1482 netif_dbg(dev, tx_queued, dev->net,
1483 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1484 #ifdef CONFIG_PM
1485 deferred:
1486 #endif
1487 return NETDEV_TX_OK;
1488 }
1489 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1490
1491 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1492 {
1493 struct urb *urb;
1494 int i;
1495 int ret = 0;
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) {
1501 ret = rx_submit(dev, urb, flags);
1502 if (ret)
1503 goto err;
1504 } else {
1505 ret = -ENOMEM;
1506 goto err;
1507 }
1508 }
1509 err:
1510 return ret;
1511 }
1512
1513 /*-------------------------------------------------------------------------*/
1514
1515 // tasklet (work deferred from completions, in_irq) or timer
1516
1517 static void usbnet_bh (struct timer_list *t)
1518 {
1519 struct usbnet *dev = from_timer(dev, t, delay);
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) {
1526 case rx_done:
1527 entry->state = rx_cleanup;
1528 rx_process (dev, skb);
1529 continue;
1530 case tx_done:
1531 kfree(entry->urb->sg);
1532 /* fall through */
1533 case rx_cleanup:
1534 usb_free_urb (entry->urb);
1535 dev_kfree_skb (skb);
1536 continue;
1537 default:
1538 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1539 }
1540 }
1541
1542 /* restart RX again after disabling due to high error rate */
1543 clear_bit(EVENT_RX_KILL, &dev->flags);
1544
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);
1551
1552 // or are we maybe short a few urbs?
1553 } else if (netif_running (dev->net) &&
1554 netif_device_present (dev->net) &&
1555 netif_carrier_ok(dev->net) &&
1556 !timer_pending(&dev->delay) &&
1557 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
1558 !test_bit(EVENT_RX_HALT, &dev->flags)) {
1559 int temp = dev->rxq.qlen;
1560
1561 if (temp < RX_QLEN(dev)) {
1562 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1563 return;
1564 if (temp != dev->rxq.qlen)
1565 netif_dbg(dev, link, dev->net,
1566 "rxqlen %d --> %d\n",
1567 temp, dev->rxq.qlen);
1568 if (dev->rxq.qlen < RX_QLEN(dev))
1569 tasklet_schedule (&dev->bh);
1570 }
1571 if (dev->txq.qlen < TX_QLEN (dev))
1572 netif_wake_queue (dev->net);
1573 }
1574 }
1575
1576 static void usbnet_bh_tasklet(unsigned long data)
1577 {
1578 struct timer_list *t = (struct timer_list *)data;
1579
1580 usbnet_bh(t);
1581 }
1582
1583
1584 /*-------------------------------------------------------------------------
1585 *
1586 * USB Device Driver support
1587 *
1588 *-------------------------------------------------------------------------*/
1589
1590 // precondition: never called in_interrupt
1591
1592 void usbnet_disconnect (struct usb_interface *intf)
1593 {
1594 struct usbnet *dev;
1595 struct usb_device *xdev;
1596 struct net_device *net;
1597
1598 dev = usb_get_intfdata(intf);
1599 usb_set_intfdata(intf, NULL);
1600 if (!dev)
1601 return;
1602
1603 xdev = interface_to_usbdev (intf);
1604
1605 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1606 intf->dev.driver->name,
1607 xdev->bus->bus_name, xdev->devpath,
1608 dev->driver_info->description);
1609
1610 net = dev->net;
1611 unregister_netdev (net);
1612
1613 cancel_work_sync(&dev->kevent);
1614
1615 usb_scuttle_anchored_urbs(&dev->deferred);
1616
1617 if (dev->driver_info->unbind)
1618 dev->driver_info->unbind (dev, intf);
1619
1620 usb_kill_urb(dev->interrupt);
1621 usb_free_urb(dev->interrupt);
1622 kfree(dev->padding_pkt);
1623
1624 free_percpu(dev->stats64);
1625 free_netdev(net);
1626 }
1627 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1628
1629 static const struct net_device_ops usbnet_netdev_ops = {
1630 .ndo_open = usbnet_open,
1631 .ndo_stop = usbnet_stop,
1632 .ndo_start_xmit = usbnet_start_xmit,
1633 .ndo_tx_timeout = usbnet_tx_timeout,
1634 .ndo_set_rx_mode = usbnet_set_rx_mode,
1635 .ndo_change_mtu = usbnet_change_mtu,
1636 .ndo_get_stats64 = usbnet_get_stats64,
1637 .ndo_set_mac_address = eth_mac_addr,
1638 .ndo_validate_addr = eth_validate_addr,
1639 };
1640
1641 /*-------------------------------------------------------------------------*/
1642
1643 // precondition: never called in_interrupt
1644
1645 static struct device_type wlan_type = {
1646 .name = "wlan",
1647 };
1648
1649 static struct device_type wwan_type = {
1650 .name = "wwan",
1651 };
1652
1653 int
1654 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1655 {
1656 struct usbnet *dev;
1657 struct net_device *net;
1658 struct usb_host_interface *interface;
1659 const struct driver_info *info;
1660 struct usb_device *xdev;
1661 int status;
1662 const char *name;
1663 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1664
1665 /* usbnet already took usb runtime pm, so have to enable the feature
1666 * for usb interface, otherwise usb_autopm_get_interface may return
1667 * failure if RUNTIME_PM is enabled.
1668 */
1669 if (!driver->supports_autosuspend) {
1670 driver->supports_autosuspend = 1;
1671 pm_runtime_enable(&udev->dev);
1672 }
1673
1674 name = udev->dev.driver->name;
1675 info = (const struct driver_info *) prod->driver_info;
1676 if (!info) {
1677 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1678 return -ENODEV;
1679 }
1680 xdev = interface_to_usbdev (udev);
1681 interface = udev->cur_altsetting;
1682
1683 status = -ENOMEM;
1684
1685 // set up our own records
1686 net = alloc_etherdev(sizeof(*dev));
1687 if (!net)
1688 goto out;
1689
1690 /* netdev_printk() needs this so do it as early as possible */
1691 SET_NETDEV_DEV(net, &udev->dev);
1692
1693 dev = netdev_priv(net);
1694 dev->udev = xdev;
1695 dev->intf = udev;
1696 dev->driver_info = info;
1697 dev->driver_name = name;
1698
1699 dev->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1700 if (!dev->stats64)
1701 goto out0;
1702
1703 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1704 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1705 init_waitqueue_head(&dev->wait);
1706 skb_queue_head_init (&dev->rxq);
1707 skb_queue_head_init (&dev->txq);
1708 skb_queue_head_init (&dev->done);
1709 skb_queue_head_init(&dev->rxq_pause);
1710 dev->bh.func = usbnet_bh_tasklet;
1711 dev->bh.data = (unsigned long)&dev->delay;
1712 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1713 init_usb_anchor(&dev->deferred);
1714 timer_setup(&dev->delay, usbnet_bh, 0);
1715 mutex_init (&dev->phy_mutex);
1716 mutex_init(&dev->interrupt_mutex);
1717 dev->interrupt_count = 0;
1718
1719 dev->net = net;
1720 strcpy (net->name, "usb%d");
1721 memcpy (net->dev_addr, node_id, sizeof node_id);
1722
1723 /* rx and tx sides can use different message sizes;
1724 * bind() should set rx_urb_size in that case.
1725 */
1726 dev->hard_mtu = net->mtu + net->hard_header_len;
1727 net->min_mtu = 0;
1728 net->max_mtu = ETH_MAX_MTU;
1729
1730 net->netdev_ops = &usbnet_netdev_ops;
1731 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1732 net->ethtool_ops = &usbnet_ethtool_ops;
1733
1734 // allow device-specific bind/init procedures
1735 // NOTE net->name still not usable ...
1736 if (info->bind) {
1737 status = info->bind (dev, udev);
1738 if (status < 0)
1739 goto out1;
1740
1741 // heuristic: "usb%d" for links we know are two-host,
1742 // else "eth%d" when there's reasonable doubt. userspace
1743 // can rename the link if it knows better.
1744 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1745 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1746 (net->dev_addr [0] & 0x02) == 0))
1747 strcpy (net->name, "eth%d");
1748 /* WLAN devices should always be named "wlan%d" */
1749 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1750 strcpy(net->name, "wlan%d");
1751 /* WWAN devices should always be named "wwan%d" */
1752 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1753 strcpy(net->name, "wwan%d");
1754
1755 /* devices that cannot do ARP */
1756 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1757 net->flags |= IFF_NOARP;
1758
1759 /* maybe the remote can't receive an Ethernet MTU */
1760 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1761 net->mtu = dev->hard_mtu - net->hard_header_len;
1762 } else if (!info->in || !info->out)
1763 status = usbnet_get_endpoints (dev, udev);
1764 else {
1765 dev->in = usb_rcvbulkpipe (xdev, info->in);
1766 dev->out = usb_sndbulkpipe (xdev, info->out);
1767 if (!(info->flags & FLAG_NO_SETINT))
1768 status = usb_set_interface (xdev,
1769 interface->desc.bInterfaceNumber,
1770 interface->desc.bAlternateSetting);
1771 else
1772 status = 0;
1773
1774 }
1775 if (status >= 0 && dev->status)
1776 status = init_status (dev, udev);
1777 if (status < 0)
1778 goto out3;
1779
1780 if (!dev->rx_urb_size)
1781 dev->rx_urb_size = dev->hard_mtu;
1782 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1783
1784 /* let userspace know we have a random address */
1785 if (ether_addr_equal(net->dev_addr, node_id))
1786 net->addr_assign_type = NET_ADDR_RANDOM;
1787
1788 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1789 SET_NETDEV_DEVTYPE(net, &wlan_type);
1790 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1791 SET_NETDEV_DEVTYPE(net, &wwan_type);
1792
1793 /* initialize max rx_qlen and tx_qlen */
1794 usbnet_update_max_qlen(dev);
1795
1796 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1797 !(info->flags & FLAG_MULTI_PACKET)) {
1798 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1799 if (!dev->padding_pkt) {
1800 status = -ENOMEM;
1801 goto out4;
1802 }
1803 }
1804
1805 status = register_netdev (net);
1806 if (status)
1807 goto out5;
1808 netif_info(dev, probe, dev->net,
1809 "register '%s' at usb-%s-%s, %s, %pM\n",
1810 udev->dev.driver->name,
1811 xdev->bus->bus_name, xdev->devpath,
1812 dev->driver_info->description,
1813 net->dev_addr);
1814
1815 // ok, it's ready to go.
1816 usb_set_intfdata (udev, dev);
1817
1818 netif_device_attach (net);
1819
1820 if (dev->driver_info->flags & FLAG_LINK_INTR)
1821 usbnet_link_change(dev, 0, 0);
1822
1823 return 0;
1824
1825 out5:
1826 kfree(dev->padding_pkt);
1827 out4:
1828 usb_free_urb(dev->interrupt);
1829 out3:
1830 if (info->unbind)
1831 info->unbind (dev, udev);
1832 out1:
1833 /* subdrivers must undo all they did in bind() if they
1834 * fail it, but we may fail later and a deferred kevent
1835 * may trigger an error resubmitting itself and, worse,
1836 * schedule a timer. So we kill it all just in case.
1837 */
1838 cancel_work_sync(&dev->kevent);
1839 del_timer_sync(&dev->delay);
1840 free_percpu(dev->stats64);
1841 out0:
1842 free_netdev(net);
1843 out:
1844 return status;
1845 }
1846 EXPORT_SYMBOL_GPL(usbnet_probe);
1847
1848 /*-------------------------------------------------------------------------*/
1849
1850 /*
1851 * suspend the whole driver as soon as the first interface is suspended
1852 * resume only when the last interface is resumed
1853 */
1854
1855 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1856 {
1857 struct usbnet *dev = usb_get_intfdata(intf);
1858
1859 if (!dev->suspend_count++) {
1860 spin_lock_irq(&dev->txq.lock);
1861 /* don't autosuspend while transmitting */
1862 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1863 dev->suspend_count--;
1864 spin_unlock_irq(&dev->txq.lock);
1865 return -EBUSY;
1866 } else {
1867 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1868 spin_unlock_irq(&dev->txq.lock);
1869 }
1870 /*
1871 * accelerate emptying of the rx and queues, to avoid
1872 * having everything error out.
1873 */
1874 netif_device_detach (dev->net);
1875 usbnet_terminate_urbs(dev);
1876 __usbnet_status_stop_force(dev);
1877
1878 /*
1879 * reattach so runtime management can use and
1880 * wake the device
1881 */
1882 netif_device_attach (dev->net);
1883 }
1884 return 0;
1885 }
1886 EXPORT_SYMBOL_GPL(usbnet_suspend);
1887
1888 int usbnet_resume (struct usb_interface *intf)
1889 {
1890 struct usbnet *dev = usb_get_intfdata(intf);
1891 struct sk_buff *skb;
1892 struct urb *res;
1893 int retval;
1894
1895 if (!--dev->suspend_count) {
1896 /* resume interrupt URB if it was previously submitted */
1897 __usbnet_status_start_force(dev, GFP_NOIO);
1898
1899 spin_lock_irq(&dev->txq.lock);
1900 while ((res = usb_get_from_anchor(&dev->deferred))) {
1901
1902 skb = (struct sk_buff *)res->context;
1903 retval = usb_submit_urb(res, GFP_ATOMIC);
1904 if (retval < 0) {
1905 dev_kfree_skb_any(skb);
1906 kfree(res->sg);
1907 usb_free_urb(res);
1908 usb_autopm_put_interface_async(dev->intf);
1909 } else {
1910 netif_trans_update(dev->net);
1911 __skb_queue_tail(&dev->txq, skb);
1912 }
1913 }
1914
1915 smp_mb();
1916 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1917 spin_unlock_irq(&dev->txq.lock);
1918
1919 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1920 /* handle remote wakeup ASAP
1921 * we cannot race against stop
1922 */
1923 if (netif_device_present(dev->net) &&
1924 !timer_pending(&dev->delay) &&
1925 !test_bit(EVENT_RX_HALT, &dev->flags))
1926 rx_alloc_submit(dev, GFP_NOIO);
1927
1928 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1929 netif_tx_wake_all_queues(dev->net);
1930 tasklet_schedule (&dev->bh);
1931 }
1932 }
1933
1934 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1935 usb_autopm_get_interface_no_resume(intf);
1936
1937 return 0;
1938 }
1939 EXPORT_SYMBOL_GPL(usbnet_resume);
1940
1941 /*
1942 * Either a subdriver implements manage_power, then it is assumed to always
1943 * be ready to be suspended or it reports the readiness to be suspended
1944 * explicitly
1945 */
1946 void usbnet_device_suggests_idle(struct usbnet *dev)
1947 {
1948 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1949 dev->intf->needs_remote_wakeup = 1;
1950 usb_autopm_put_interface_async(dev->intf);
1951 }
1952 }
1953 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1954
1955 /*
1956 * For devices that can do without special commands
1957 */
1958 int usbnet_manage_power(struct usbnet *dev, int on)
1959 {
1960 dev->intf->needs_remote_wakeup = on;
1961 return 0;
1962 }
1963 EXPORT_SYMBOL(usbnet_manage_power);
1964
1965 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1966 {
1967 /* update link after link is reseted */
1968 if (link && !need_reset)
1969 netif_carrier_on(dev->net);
1970 else
1971 netif_carrier_off(dev->net);
1972
1973 if (need_reset && link)
1974 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1975 else
1976 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1977 }
1978 EXPORT_SYMBOL(usbnet_link_change);
1979
1980 /*-------------------------------------------------------------------------*/
1981 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1982 u16 value, u16 index, void *data, u16 size)
1983 {
1984 void *buf = NULL;
1985 int err = -ENOMEM;
1986
1987 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1988 " value=0x%04x index=0x%04x size=%d\n",
1989 cmd, reqtype, value, index, size);
1990
1991 if (size) {
1992 buf = kmalloc(size, GFP_KERNEL);
1993 if (!buf)
1994 goto out;
1995 }
1996
1997 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1998 cmd, reqtype, value, index, buf, size,
1999 USB_CTRL_GET_TIMEOUT);
2000 if (err > 0 && err <= size) {
2001 if (data)
2002 memcpy(data, buf, err);
2003 else
2004 netdev_dbg(dev->net,
2005 "Huh? Data requested but thrown away.\n");
2006 }
2007 kfree(buf);
2008 out:
2009 return err;
2010 }
2011
2012 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2013 u16 value, u16 index, const void *data,
2014 u16 size)
2015 {
2016 void *buf = NULL;
2017 int err = -ENOMEM;
2018
2019 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2020 " value=0x%04x index=0x%04x size=%d\n",
2021 cmd, reqtype, value, index, size);
2022
2023 if (data) {
2024 buf = kmemdup(data, size, GFP_KERNEL);
2025 if (!buf)
2026 goto out;
2027 } else {
2028 if (size) {
2029 WARN_ON_ONCE(1);
2030 err = -EINVAL;
2031 goto out;
2032 }
2033 }
2034
2035 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
2036 cmd, reqtype, value, index, buf, size,
2037 USB_CTRL_SET_TIMEOUT);
2038 kfree(buf);
2039
2040 out:
2041 return err;
2042 }
2043
2044 /*
2045 * The function can't be called inside suspend/resume callback,
2046 * otherwise deadlock will be caused.
2047 */
2048 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2049 u16 value, u16 index, void *data, u16 size)
2050 {
2051 int ret;
2052
2053 if (usb_autopm_get_interface(dev->intf) < 0)
2054 return -ENODEV;
2055 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2056 data, size);
2057 usb_autopm_put_interface(dev->intf);
2058 return ret;
2059 }
2060 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
2061
2062 /*
2063 * The function can't be called inside suspend/resume callback,
2064 * otherwise deadlock will be caused.
2065 */
2066 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2067 u16 value, u16 index, const void *data, u16 size)
2068 {
2069 int ret;
2070
2071 if (usb_autopm_get_interface(dev->intf) < 0)
2072 return -ENODEV;
2073 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2074 data, size);
2075 usb_autopm_put_interface(dev->intf);
2076 return ret;
2077 }
2078 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2079
2080 /*
2081 * The function can be called inside suspend/resume callback safely
2082 * and should only be called by suspend/resume callback generally.
2083 */
2084 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2085 u16 value, u16 index, void *data, u16 size)
2086 {
2087 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2088 data, size);
2089 }
2090 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2091
2092 /*
2093 * The function can be called inside suspend/resume callback safely
2094 * and should only be called by suspend/resume callback generally.
2095 */
2096 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2097 u16 value, u16 index, const void *data,
2098 u16 size)
2099 {
2100 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2101 data, size);
2102 }
2103 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2104
2105 static void usbnet_async_cmd_cb(struct urb *urb)
2106 {
2107 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2108 int status = urb->status;
2109
2110 if (status < 0)
2111 dev_dbg(&urb->dev->dev, "%s failed with %d",
2112 __func__, status);
2113
2114 kfree(req);
2115 usb_free_urb(urb);
2116 }
2117
2118 /*
2119 * The caller must make sure that device can't be put into suspend
2120 * state until the control URB completes.
2121 */
2122 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2123 u16 value, u16 index, const void *data, u16 size)
2124 {
2125 struct usb_ctrlrequest *req = NULL;
2126 struct urb *urb;
2127 int err = -ENOMEM;
2128 void *buf = NULL;
2129
2130 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2131 " value=0x%04x index=0x%04x size=%d\n",
2132 cmd, reqtype, value, index, size);
2133
2134 urb = usb_alloc_urb(0, GFP_ATOMIC);
2135 if (!urb)
2136 goto fail;
2137
2138 if (data) {
2139 buf = kmemdup(data, size, GFP_ATOMIC);
2140 if (!buf) {
2141 netdev_err(dev->net, "Error allocating buffer"
2142 " in %s!\n", __func__);
2143 goto fail_free;
2144 }
2145 }
2146
2147 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2148 if (!req)
2149 goto fail_free_buf;
2150
2151 req->bRequestType = reqtype;
2152 req->bRequest = cmd;
2153 req->wValue = cpu_to_le16(value);
2154 req->wIndex = cpu_to_le16(index);
2155 req->wLength = cpu_to_le16(size);
2156
2157 usb_fill_control_urb(urb, dev->udev,
2158 usb_sndctrlpipe(dev->udev, 0),
2159 (void *)req, buf, size,
2160 usbnet_async_cmd_cb, req);
2161 urb->transfer_flags |= URB_FREE_BUFFER;
2162
2163 err = usb_submit_urb(urb, GFP_ATOMIC);
2164 if (err < 0) {
2165 netdev_err(dev->net, "Error submitting the control"
2166 " message: status=%d\n", err);
2167 goto fail_free;
2168 }
2169 return 0;
2170
2171 fail_free_buf:
2172 kfree(buf);
2173 fail_free:
2174 kfree(req);
2175 usb_free_urb(urb);
2176 fail:
2177 return err;
2178
2179 }
2180 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2181 /*-------------------------------------------------------------------------*/
2182
2183 static int __init usbnet_init(void)
2184 {
2185 /* Compiler should optimize this out. */
2186 BUILD_BUG_ON(
2187 sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data));
2188
2189 eth_random_addr(node_id);
2190 return 0;
2191 }
2192 module_init(usbnet_init);
2193
2194 static void __exit usbnet_exit(void)
2195 {
2196 }
2197 module_exit(usbnet_exit);
2198
2199 MODULE_AUTHOR("David Brownell");
2200 MODULE_DESCRIPTION("USB network driver framework");
2201 MODULE_LICENSE("GPL");
Linux with added FPC-III support