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[PATCH] USB: usbnet (8/9) module for RNDIS devices
[linux-block.git] / drivers / usb / net / usbnet.c
CommitLineData
1da177e4
LT		 1/*
2 * USB Networking Links
f29fc259 3 * Copyright (C) 2000-2005 by David Brownell
1da177e4 4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
1da177e4
LT		 5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21/*
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices:
24 *
25 * + USB host-to-host "network cables", used for IP-over-USB links.
26 * These are often used for Laplink style connectivity products.
27 * - AnchorChip 2720
28 * - Belkin, eTEK (interops with Win32 drivers)
29 * - GeneSys GL620USB-A
30 * - NetChip 1080 (interoperates with NetChip Win32 drivers)
31 * - Prolific PL-2301/2302 (replaces "plusb" driver)
32 * - KC Technology KC2190
33 *
34 * + Smart USB devices can support such links directly, using Internet
35 * standard protocols instead of proprietary host-to-device links.
36 * - Linux PDAs like iPaq, Yopy, and Zaurus
37 * - The BLOB boot loader (for diskless booting)
38 * - Linux "gadgets", perhaps using PXA-2xx or Net2280 controllers
39 * - Devices using EPSON's sample USB firmware
40 * - CDC-Ethernet class devices, such as many cable modems
41 *
42 * + Adapters to networks such as Ethernet.
43 * - AX8817X based USB 2.0 products
44 *
45 * Links to these devices can be bridged using Linux Ethernet bridging.
46 * With minor exceptions, these all use similar USB framing for network
47 * traffic, but need different protocols for control traffic.
48 *
49 * USB devices can implement their side of this protocol at the cost
50 * of two bulk endpoints; it's not restricted to "cable" applications.
51 * See the SA1110, Zaurus, or EPSON device/client support in this driver;
52 * slave/target drivers such as "usb-eth" (on most SA-1100 PDAs) or
53 * "g_ether" (in the Linux "gadget" framework) implement that behavior
54 * within devices.
55 *
56 *
57 * CHANGELOG:
58 *
59 * 13-sep-2000 experimental, new
60 * 10-oct-2000 usb_device_id table created.
61 * 28-oct-2000 misc fixes; mostly, discard more TTL-mangled rx packets.
62 * 01-nov-2000 usb_device_id table and probing api update by
63 * Adam J. Richter <adam@yggdrasil.com>.
64 * 18-dec-2000 (db) tx watchdog, "net1080" renaming to "usbnet", device_info
65 * and prolific support, isolate net1080-specific bits, cleanup.
66 * fix unlink_urbs oops in D3 PM resume code path.
67 *
68 * 02-feb-2001 (db) fix tx skb sharing, packet length, match_flags, ...
69 * 08-feb-2001 stubbed in "linuxdev", maybe the SA-1100 folk can use it;
70 * AnchorChips 2720 support (from spec) for testing;
71 * fix bit-ordering problem with ethernet multicast addr
72 * 19-feb-2001 Support for clearing halt conditions. SA1100 UDC support
73 * updates. Oleg Drokin (green@iXcelerator.com)
74 * 25-mar-2001 More SA-1100 updates, including workaround for ip problem
75 * expecting cleared skb->cb and framing change to match latest
76 * handhelds.org version (Oleg). Enable device IDs from the
77 * Win32 Belkin driver; other cleanups (db).
78 * 16-jul-2001 Bugfixes for uhci oops-on-unplug, Belkin support, various
79 * cleanups for problems not yet seen in the field. (db)
80 * 17-oct-2001 Handle "Advance USBNET" product, like Belkin/eTEK devices,
81 * from Ioannis Mavroukakis <i.mavroukakis@btinternet.com>;
82 * rx unlinks somehow weren't async; minor cleanup.
83 * 03-nov-2001 Merged GeneSys driver; original code from Jiun-Jie Huang
84 * <huangjj@genesyslogic.com.tw>, updated by Stanislav Brabec
85 * <utx@penguin.cz>. Made framing options (NetChip/GeneSys)
86 * tie mostly to (sub)driver info. Workaround some PL-2302
87 * chips that seem to reject SET_INTERFACE requests.
88 *
89 * 06-apr-2002 Added ethtool support, based on a patch from Brad Hards.
90 * Level of diagnostics is more configurable; they use device
91 * location (usb_device->devpath) instead of address (2.5).
92 * For tx_fixup, memflags can't be NOIO.
93 * 07-may-2002 Generalize/cleanup keventd support, handling rx stalls (mostly
94 * for USB 2.0 TTs) and memory shortages (potential) too. (db)
95 * Use "locally assigned" IEEE802 address space. (Brad Hards)
96 * 18-oct-2002 Support for Zaurus (Pavel Machek), related cleanup (db).
97 * 14-dec-2002 Remove Zaurus-private crc32 code (Pavel); 2.5 oops fix,
98 * cleanups and stubbed PXA-250 support (db), fix for framing
99 * issues on Z, net1080, and gl620a (Toby Milne)
100 *
101 * 31-mar-2003 Use endpoint descriptors: high speed support, simpler sa1100
102 * vs pxa25x, and CDC Ethernet. Throttle down log floods on
103 * disconnect; other cleanups. (db) Flush net1080 fifos
104 * after several sequential framing errors. (Johannes Erdfelt)
105 * 22-aug-2003 AX8817X support (Dave Hollis).
64e04910 106 *
1da177e4
LT		 107 * 14-jun-2004 Trivial patch for AX8817X based Buffalo LUA-U2-KTX in Japan
108 * (Neil Bortnak)
109 * 03-nov-2004 Trivial patch for KC2190 (KC-190) chip. (Jonathan McDowell)
110 *
111 * 01-feb-2005 AX88772 support (Phil Chang & Dave Hollis)
112 *-------------------------------------------------------------------------*/
113
114// #define DEBUG // error path messages, extra info
115// #define VERBOSE // more; success messages
116
117#include <linux/config.h>
118#ifdef CONFIG_USB_DEBUG
119# define DEBUG
120#endif
121#include <linux/module.h>
1da177e4
LT		 122#include <linux/sched.h>
123#include <linux/init.h>
124#include <linux/netdevice.h>
125#include <linux/etherdevice.h>
1da177e4
LT		 126#include <linux/ethtool.h>
127#include <linux/workqueue.h>
128#include <linux/mii.h>
1da177e4 129#include <linux/usb.h>
f29fc259
DB		 130
131#include "usbnet.h"
132
133#define DRIVER_VERSION "22-Aug-2005"
1da177e4
LT		 134
135
136/*-------------------------------------------------------------------------*/
137
138/*
139 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
140 * Several dozen bytes of IPv4 data can fit in two such transactions.
141 * One maximum size Ethernet packet takes twenty four of them.
142 * For high speed, each frame comfortably fits almost 36 max size
143 * Ethernet packets (so queues should be bigger).
f29fc259
DB		 144 *
145 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
146 * let the USB host controller be busy for 5msec or more before an irq
147 * is required, under load. Jumbograms change the equation.
1da177e4
LT		 148 */
149#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
150#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? 60 : 4)
151
1da177e4
LT		 152// reawaken network queue this soon after stopping; else watchdog barks
153#define TX_TIMEOUT_JIFFIES (5*HZ)
154
155// throttle rx/tx briefly after some faults, so khubd might disconnect()
156// us (it polls at HZ/4 usually) before we report too many false errors.
157#define THROTTLE_JIFFIES (HZ/8)
158
1da177e4
LT		 159// between wakeups
160#define UNLINK_TIMEOUT_MS 3
161
162/*-------------------------------------------------------------------------*/
163
164// randomly generated ethernet address
165static u8 node_id [ETH_ALEN];
166
1da177e4
LT		 167static const char driver_name [] = "usbnet";
168
169/* use ethtool to change the level for any given device */
170static int msg_level = -1;
171module_param (msg_level, int, 0);
172MODULE_PARM_DESC (msg_level, "Override default message level");
173
1da177e4
LT		 174/*-------------------------------------------------------------------------*/
175
1da177e4 176/* handles CDC Ethernet and many other network "bulk data" interfaces */
2e55cc72 177int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
1da177e4
LT		 178{
179 int tmp;
180 struct usb_host_interface *alt = NULL;
181 struct usb_host_endpoint *in = NULL, *out = NULL;
182 struct usb_host_endpoint *status = NULL;
183
184 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
185 unsigned ep;
186
187 in = out = status = NULL;
188 alt = intf->altsetting + tmp;
189
190 /* take the first altsetting with in-bulk + out-bulk;
191 * remember any status endpoint, just in case;
192 * ignore other endpoints and altsetttings.
193 */
194 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
195 struct usb_host_endpoint *e;
196 int intr = 0;
197
198 e = alt->endpoint + ep;
199 switch (e->desc.bmAttributes) {
200 case USB_ENDPOINT_XFER_INT:
201 if (!(e->desc.bEndpointAddress & USB_DIR_IN))
202 continue;
203 intr = 1;
204 /* FALLTHROUGH */
205 case USB_ENDPOINT_XFER_BULK:
206 break;
207 default:
208 continue;
209 }
210 if (e->desc.bEndpointAddress & USB_DIR_IN) {
211 if (!intr && !in)
212 in = e;
213 else if (intr && !status)
214 status = e;
215 } else {
216 if (!out)
217 out = e;
218 }
219 }
220 if (in && out)
221 break;
222 }
223 if (!alt || !in || !out)
224 return -EINVAL;
225
226 if (alt->desc.bAlternateSetting != 0
227 || !(dev->driver_info->flags & FLAG_NO_SETINT)) {
228 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
229 alt->desc.bAlternateSetting);
230 if (tmp < 0)
231 return tmp;
232 }
233
234 dev->in = usb_rcvbulkpipe (dev->udev,
235 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
236 dev->out = usb_sndbulkpipe (dev->udev,
237 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
238 dev->status = status;
239 return 0;
240}
2e55cc72 241EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
1da177e4
LT		 242
243static void intr_complete (struct urb *urb, struct pt_regs *regs);
244
245static int init_status (struct usbnet *dev, struct usb_interface *intf)
246{
247 char *buf = NULL;
248 unsigned pipe = 0;
249 unsigned maxp;
250 unsigned period;
251
252 if (!dev->driver_info->status)
253 return 0;
254
255 pipe = usb_rcvintpipe (dev->udev,
256 dev->status->desc.bEndpointAddress
257 & USB_ENDPOINT_NUMBER_MASK);
258 maxp = usb_maxpacket (dev->udev, pipe, 0);
259
260 /* avoid 1 msec chatter: min 8 msec poll rate */
261 period = max ((int) dev->status->desc.bInterval,
262 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
263
264 buf = kmalloc (maxp, SLAB_KERNEL);
265 if (buf) {
266 dev->interrupt = usb_alloc_urb (0, SLAB_KERNEL);
267 if (!dev->interrupt) {
268 kfree (buf);
269 return -ENOMEM;
270 } else {
271 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
272 buf, maxp, intr_complete, dev, period);
273 dev_dbg(&intf->dev,
274 "status ep%din, %d bytes period %d\n",
275 usb_pipeendpoint(pipe), maxp, period);
276 }
277 }
278 return 0;
279}
280
2e55cc72
DB		 281/* Passes this packet up the stack, updating its accounting.
282 * Some link protocols batch packets, so their rx_fixup paths
283 * can return clones as well as just modify the original skb.
284 */
285void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
1da177e4
LT		 286{
287 int status;
288
289 skb->dev = dev->net;
290 skb->protocol = eth_type_trans (skb, dev->net);
291 dev->stats.rx_packets++;
292 dev->stats.rx_bytes += skb->len;
293
294 if (netif_msg_rx_status (dev))
5330e927 295 devdbg (dev, "< rx, len %zu, type 0x%x",
1da177e4
LT		 296 skb->len + sizeof (struct ethhdr), skb->protocol);
297 memset (skb->cb, 0, sizeof (struct skb_data));
298 status = netif_rx (skb);
299 if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev))
300 devdbg (dev, "netif_rx status %d", status);
301}
2e55cc72 302EXPORT_SYMBOL_GPL(usbnet_skb_return);
1da177e4 303
1da177e4
LT		 304\f
305#ifdef CONFIG_USB_PL2301
306#define HAVE_HARDWARE
307
308/*-------------------------------------------------------------------------
309 *
310 * Prolific PL-2301/PL-2302 driver ... http://www.prolifictech.com
311 *
312 * The protocol and handshaking used here should be bug-compatible
313 * with the Linux 2.2 "plusb" driver, by Deti Fliegl.
314 *
315 *-------------------------------------------------------------------------*/
316
317/*
318 * Bits 0-4 can be used for software handshaking; they're set from
319 * one end, cleared from the other, "read" with the interrupt byte.
320 */
321#define PL_S_EN (1<<7) /* (feature only) suspend enable */
322/* reserved bit -- rx ready (6) ? */
323#define PL_TX_READY (1<<5) /* (interrupt only) transmit ready */
324#define PL_RESET_OUT (1<<4) /* reset output pipe */
325#define PL_RESET_IN (1<<3) /* reset input pipe */
326#define PL_TX_C (1<<2) /* transmission complete */
327#define PL_TX_REQ (1<<1) /* transmission received */
328#define PL_PEER_E (1<<0) /* peer exists */
329
330static inline int
331pl_vendor_req (struct usbnet *dev, u8 req, u8 val, u8 index)
332{
333 return usb_control_msg (dev->udev,
334 usb_rcvctrlpipe (dev->udev, 0),
335 req,
336 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
337 val, index,
338 NULL, 0,
47ee3051 339 USB_CTRL_GET_TIMEOUT);
1da177e4
LT		 340}
341
342static inline int
343pl_clear_QuickLink_features (struct usbnet *dev, int val)
344{
345 return pl_vendor_req (dev, 1, (u8) val, 0);
346}
347
348static inline int
349pl_set_QuickLink_features (struct usbnet *dev, int val)
350{
351 return pl_vendor_req (dev, 3, (u8) val, 0);
352}
353
354/*-------------------------------------------------------------------------*/
355
356static int pl_reset (struct usbnet *dev)
357{
358 /* some units seem to need this reset, others reject it utterly.
359 * FIXME be more like "naplink" or windows drivers.
360 */
361 (void) pl_set_QuickLink_features (dev,
362 PL_S_EN|PL_RESET_OUT|PL_RESET_IN|PL_PEER_E);
363 return 0;
364}
365
366static const struct driver_info prolific_info = {
367 .description = "Prolific PL-2301/PL-2302",
368 .flags = FLAG_NO_SETINT,
369 /* some PL-2302 versions seem to fail usb_set_interface() */
370 .reset = pl_reset,
371};
372
373#endif /* CONFIG_USB_PL2301 */
374
1da177e4
LT		 375\f
376/*-------------------------------------------------------------------------
377 *
378 * Network Device Driver (peer link to "Host Device", from USB host)
379 *
380 *-------------------------------------------------------------------------*/
381
382static int usbnet_change_mtu (struct net_device *net, int new_mtu)
383{
384 struct usbnet *dev = netdev_priv(net);
f29fc259 385 int ll_mtu = new_mtu + net->hard_header_len;
1da177e4 386
f29fc259 387 if (new_mtu <= 0 || ll_mtu > dev->hard_mtu)
1da177e4 388 return -EINVAL;
1da177e4 389 // no second zero-length packet read wanted after mtu-sized packets
f29fc259 390 if ((ll_mtu % dev->maxpacket) == 0)
1da177e4
LT		 391 return -EDOM;
392 net->mtu = new_mtu;
393 return 0;
394}
395
396/*-------------------------------------------------------------------------*/
397
398static struct net_device_stats *usbnet_get_stats (struct net_device *net)
399{
400 struct usbnet *dev = netdev_priv(net);
401 return &dev->stats;
402}
403
404/*-------------------------------------------------------------------------*/
405
406/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
407 * completion callbacks. 2.5 should have fixed those bugs...
408 */
409
8728b834 410static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
1da177e4 411{
1da177e4
LT		 412 unsigned long flags;
413
8728b834
DM		 414 spin_lock_irqsave(&list->lock, flags);
415 __skb_unlink(skb, list);
416 spin_unlock(&list->lock);
417 spin_lock(&dev->done.lock);
418 __skb_queue_tail(&dev->done, skb);
1da177e4 419 if (dev->done.qlen == 1)
8728b834
DM		 420 tasklet_schedule(&dev->bh);
421 spin_unlock_irqrestore(&dev->done.lock, flags);
1da177e4
LT		 422}
423
424/* some work can't be done in tasklets, so we use keventd
425 *
426 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
427 * but tasklet_schedule() doesn't. hope the failure is rare.
428 */
2e55cc72 429void usbnet_defer_kevent (struct usbnet *dev, int work)
1da177e4
LT		 430{
431 set_bit (work, &dev->flags);
432 if (!schedule_work (&dev->kevent))
433 deverr (dev, "kevent %d may have been dropped", work);
434 else
435 devdbg (dev, "kevent %d scheduled", work);
436}
2e55cc72 437EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
1da177e4
LT		 438
439/*-------------------------------------------------------------------------*/
440
441static void rx_complete (struct urb *urb, struct pt_regs *regs);
442
0d9899f8 443static void rx_submit (struct usbnet *dev, struct urb *urb, unsigned flags)
1da177e4
LT		 444{
445 struct sk_buff *skb;
446 struct skb_data *entry;
447 int retval = 0;
448 unsigned long lockflags;
2e55cc72 449 size_t size = dev->rx_urb_size;
1da177e4 450
1da177e4
LT		 451 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
452 if (netif_msg_rx_err (dev))
453 devdbg (dev, "no rx skb");
2e55cc72 454 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
1da177e4
LT		 455 usb_free_urb (urb);
456 return;
457 }
458 skb_reserve (skb, NET_IP_ALIGN);
459
460 entry = (struct skb_data *) skb->cb;
461 entry->urb = urb;
462 entry->dev = dev;
463 entry->state = rx_start;
464 entry->length = 0;
465
466 usb_fill_bulk_urb (urb, dev->udev, dev->in,
467 skb->data, size, rx_complete, skb);
1da177e4
LT		 468
469 spin_lock_irqsave (&dev->rxq.lock, lockflags);
470
471 if (netif_running (dev->net)
472 && netif_device_present (dev->net)
473 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
474 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)){
475 case -EPIPE:
2e55cc72 476 usbnet_defer_kevent (dev, EVENT_RX_HALT);
1da177e4
LT		 477 break;
478 case -ENOMEM:
2e55cc72 479 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
1da177e4
LT		 480 break;
481 case -ENODEV:
482 if (netif_msg_ifdown (dev))
483 devdbg (dev, "device gone");
484 netif_device_detach (dev->net);
485 break;
486 default:
487 if (netif_msg_rx_err (dev))
488 devdbg (dev, "rx submit, %d", retval);
489 tasklet_schedule (&dev->bh);
490 break;
491 case 0:
492 __skb_queue_tail (&dev->rxq, skb);
493 }
494 } else {
495 if (netif_msg_ifdown (dev))
496 devdbg (dev, "rx: stopped");
497 retval = -ENOLINK;
498 }
499 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
500 if (retval) {
501 dev_kfree_skb_any (skb);
502 usb_free_urb (urb);
503 }
504}
505
506
507/*-------------------------------------------------------------------------*/
508
509static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
510{
511 if (dev->driver_info->rx_fixup
512 && !dev->driver_info->rx_fixup (dev, skb))
513 goto error;
514 // else network stack removes extra byte if we forced a short packet
515
516 if (skb->len)
2e55cc72 517 usbnet_skb_return (dev, skb);
1da177e4
LT		 518 else {
519 if (netif_msg_rx_err (dev))
520 devdbg (dev, "drop");
521error:
522 dev->stats.rx_errors++;
523 skb_queue_tail (&dev->done, skb);
524 }
525}
526
527/*-------------------------------------------------------------------------*/
528
529static void rx_complete (struct urb *urb, struct pt_regs *regs)
530{
531 struct sk_buff *skb = (struct sk_buff *) urb->context;
532 struct skb_data *entry = (struct skb_data *) skb->cb;
533 struct usbnet *dev = entry->dev;
534 int urb_status = urb->status;
535
536 skb_put (skb, urb->actual_length);
537 entry->state = rx_done;
538 entry->urb = NULL;
539
540 switch (urb_status) {
541 // success
542 case 0:
f29fc259 543 if (skb->len < dev->net->hard_header_len) {
1da177e4
LT		 544 entry->state = rx_cleanup;
545 dev->stats.rx_errors++;
546 dev->stats.rx_length_errors++;
547 if (netif_msg_rx_err (dev))
548 devdbg (dev, "rx length %d", skb->len);
549 }
550 break;
551
552 // stalls need manual reset. this is rare ... except that
553 // when going through USB 2.0 TTs, unplug appears this way.
554 // we avoid the highspeed version of the ETIMEOUT/EILSEQ
555 // storm, recovering as needed.
556 case -EPIPE:
557 dev->stats.rx_errors++;
2e55cc72 558 usbnet_defer_kevent (dev, EVENT_RX_HALT);
1da177e4
LT		 559 // FALLTHROUGH
560
561 // software-driven interface shutdown
562 case -ECONNRESET: // async unlink
563 case -ESHUTDOWN: // hardware gone
564 if (netif_msg_ifdown (dev))
565 devdbg (dev, "rx shutdown, code %d", urb_status);
566 goto block;
567
568 // we get controller i/o faults during khubd disconnect() delays.
569 // throttle down resubmits, to avoid log floods; just temporarily,
570 // so we still recover when the fault isn't a khubd delay.
571 case -EPROTO: // ehci
572 case -ETIMEDOUT: // ohci
573 case -EILSEQ: // uhci
574 dev->stats.rx_errors++;
575 if (!timer_pending (&dev->delay)) {
576 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
577 if (netif_msg_link (dev))
578 devdbg (dev, "rx throttle %d", urb_status);
579 }
580block:
581 entry->state = rx_cleanup;
582 entry->urb = urb;
583 urb = NULL;
584 break;
585
586 // data overrun ... flush fifo?
587 case -EOVERFLOW:
588 dev->stats.rx_over_errors++;
589 // FALLTHROUGH
590
591 default:
592 entry->state = rx_cleanup;
593 dev->stats.rx_errors++;
594 if (netif_msg_rx_err (dev))
595 devdbg (dev, "rx status %d", urb_status);
596 break;
597 }
598
8728b834 599 defer_bh(dev, skb, &dev->rxq);
1da177e4
LT		 600
601 if (urb) {
602 if (netif_running (dev->net)
603 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
604 rx_submit (dev, urb, GFP_ATOMIC);
605 return;
606 }
607 usb_free_urb (urb);
608 }
609 if (netif_msg_rx_err (dev))
610 devdbg (dev, "no read resubmitted");
611}
612
613static void intr_complete (struct urb *urb, struct pt_regs *regs)
614{
615 struct usbnet *dev = urb->context;
616 int status = urb->status;
617
618 switch (status) {
619 /* success */
620 case 0:
621 dev->driver_info->status(dev, urb);
622 break;
623
624 /* software-driven interface shutdown */
625 case -ENOENT: // urb killed
626 case -ESHUTDOWN: // hardware gone
627 if (netif_msg_ifdown (dev))
628 devdbg (dev, "intr shutdown, code %d", status);
629 return;
630
631 /* NOTE: not throttling like RX/TX, since this endpoint
632 * already polls infrequently
633 */
634 default:
635 devdbg (dev, "intr status %d", status);
636 break;
637 }
638
639 if (!netif_running (dev->net))
640 return;
641
642 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
643 status = usb_submit_urb (urb, GFP_ATOMIC);
644 if (status != 0 && netif_msg_timer (dev))
645 deverr(dev, "intr resubmit --> %d", status);
646}
647
648/*-------------------------------------------------------------------------*/
649
650// unlink pending rx/tx; completion handlers do all other cleanup
651
652static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
653{
654 unsigned long flags;
655 struct sk_buff *skb, *skbnext;
656 int count = 0;
657
658 spin_lock_irqsave (&q->lock, flags);
659 for (skb = q->next; skb != (struct sk_buff *) q; skb = skbnext) {
660 struct skb_data *entry;
661 struct urb *urb;
662 int retval;
663
664 entry = (struct skb_data *) skb->cb;
665 urb = entry->urb;
666 skbnext = skb->next;
667
668 // during some PM-driven resume scenarios,
669 // these (async) unlinks complete immediately
670 retval = usb_unlink_urb (urb);
671 if (retval != -EINPROGRESS && retval != 0)
672 devdbg (dev, "unlink urb err, %d", retval);
673 else
674 count++;
675 }
676 spin_unlock_irqrestore (&q->lock, flags);
677 return count;
678}
679
680
681/*-------------------------------------------------------------------------*/
682
683// precondition: never called in_interrupt
684
685static int usbnet_stop (struct net_device *net)
686{
687 struct usbnet *dev = netdev_priv(net);
688 int temp;
689 DECLARE_WAIT_QUEUE_HEAD (unlink_wakeup);
690 DECLARE_WAITQUEUE (wait, current);
691
692 netif_stop_queue (net);
693
694 if (netif_msg_ifdown (dev))
695 devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
696 dev->stats.rx_packets, dev->stats.tx_packets,
697 dev->stats.rx_errors, dev->stats.tx_errors
698 );
699
700 // ensure there are no more active urbs
701 add_wait_queue (&unlink_wakeup, &wait);
702 dev->wait = &unlink_wakeup;
703 temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq);
704
705 // maybe wait for deletions to finish.
b03efcfb
DM		 706 while (!skb_queue_empty(&dev->rxq) &&
707 !skb_queue_empty(&dev->txq) &&
708 !skb_queue_empty(&dev->done)) {
1da177e4
LT		 709 msleep(UNLINK_TIMEOUT_MS);
710 if (netif_msg_ifdown (dev))
711 devdbg (dev, "waited for %d urb completions", temp);
712 }
713 dev->wait = NULL;
714 remove_wait_queue (&unlink_wakeup, &wait);
715
716 usb_kill_urb(dev->interrupt);
717
718 /* deferred work (task, timer, softirq) must also stop.
719 * can't flush_scheduled_work() until we drop rtnl (later),
720 * else workers could deadlock; so make workers a NOP.
721 */
722 dev->flags = 0;
723 del_timer_sync (&dev->delay);
724 tasklet_kill (&dev->bh);
725
726 return 0;
727}
728
729/*-------------------------------------------------------------------------*/
730
731// posts reads, and enables write queuing
732
733// precondition: never called in_interrupt
734
735static int usbnet_open (struct net_device *net)
736{
737 struct usbnet *dev = netdev_priv(net);
738 int retval = 0;
739 struct driver_info *info = dev->driver_info;
740
741 // put into "known safe" state
742 if (info->reset && (retval = info->reset (dev)) < 0) {
743 if (netif_msg_ifup (dev))
744 devinfo (dev,
745 "open reset fail (%d) usbnet usb-%s-%s, %s",
746 retval,
747 dev->udev->bus->bus_name, dev->udev->devpath,
748 info->description);
749 goto done;
750 }
751
752 // insist peer be connected
753 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
754 if (netif_msg_ifup (dev))
755 devdbg (dev, "can't open; %d", retval);
756 goto done;
757 }
758
759 /* start any status interrupt transfer */
760 if (dev->interrupt) {
761 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
762 if (retval < 0) {
763 if (netif_msg_ifup (dev))
764 deverr (dev, "intr submit %d", retval);
765 goto done;
766 }
767 }
768
769 netif_start_queue (net);
770 if (netif_msg_ifup (dev)) {
771 char *framing;
772
773 if (dev->driver_info->flags & FLAG_FRAMING_NC)
774 framing = "NetChip";
775 else if (dev->driver_info->flags & FLAG_FRAMING_GL)
776 framing = "GeneSys";
777 else if (dev->driver_info->flags & FLAG_FRAMING_Z)
778 framing = "Zaurus";
779 else if (dev->driver_info->flags & FLAG_FRAMING_RN)
780 framing = "RNDIS";
781 else if (dev->driver_info->flags & FLAG_FRAMING_AX)
782 framing = "ASIX";
783 else
784 framing = "simple";
785
786 devinfo (dev, "open: enable queueing "
787 "(rx %d, tx %d) mtu %d %s framing",
788 RX_QLEN (dev), TX_QLEN (dev), dev->net->mtu,
789 framing);
790 }
791
792 // delay posting reads until we're fully open
793 tasklet_schedule (&dev->bh);
794done:
795 return retval;
796}
797
798/*-------------------------------------------------------------------------*/
799
2e55cc72
DB		 800/* ethtool methods; minidrivers may need to add some more, but
801 * they'll probably want to use this base set.
802 */
803
804void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1da177e4
LT		 805{
806 struct usbnet *dev = netdev_priv(net);
807
2e55cc72 808 /* REVISIT don't always return "usbnet" */
1da177e4
LT		 809 strncpy (info->driver, driver_name, sizeof info->driver);
810 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
811 strncpy (info->fw_version, dev->driver_info->description,
812 sizeof info->fw_version);
813 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
814}
2e55cc72 815EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1da177e4
LT		 816
817static u32 usbnet_get_link (struct net_device *net)
818{
819 struct usbnet *dev = netdev_priv(net);
820
f29fc259 821 /* If a check_connect is defined, return its result */
1da177e4
LT		 822 if (dev->driver_info->check_connect)
823 return dev->driver_info->check_connect (dev) == 0;
824
f29fc259 825 /* Otherwise, say we're up (to avoid breaking scripts) */
1da177e4
LT		 826 return 1;
827}
828
2e55cc72 829u32 usbnet_get_msglevel (struct net_device *net)
1da177e4
LT		 830{
831 struct usbnet *dev = netdev_priv(net);
832
833 return dev->msg_enable;
834}
2e55cc72 835EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1da177e4 836
2e55cc72 837void usbnet_set_msglevel (struct net_device *net, u32 level)
1da177e4
LT		 838{
839 struct usbnet *dev = netdev_priv(net);
840
841 dev->msg_enable = level;
842}
2e55cc72 843EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1da177e4 844
2e55cc72
DB		 845/* drivers may override default ethtool_ops in their bind() routine */
846static struct ethtool_ops usbnet_ethtool_ops = {
847 .get_drvinfo = usbnet_get_drvinfo,
848 .get_link = usbnet_get_link,
849 .get_msglevel = usbnet_get_msglevel,
850 .set_msglevel = usbnet_set_msglevel,
851};
1da177e4
LT		 852
853/*-------------------------------------------------------------------------*/
854
855/* work that cannot be done in interrupt context uses keventd.
856 *
857 * NOTE: with 2.5 we could do more of this using completion callbacks,
858 * especially now that control transfers can be queued.
859 */
860static void
861kevent (void *data)
862{
863 struct usbnet *dev = data;
864 int status;
865
866 /* usb_clear_halt() needs a thread context */
867 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
868 unlink_urbs (dev, &dev->txq);
869 status = usb_clear_halt (dev->udev, dev->out);
f29fc259
DB		 870 if (status < 0
871 && status != -EPIPE
872 && status != -ESHUTDOWN) {
1da177e4
LT		 873 if (netif_msg_tx_err (dev))
874 deverr (dev, "can't clear tx halt, status %d",
875 status);
876 } else {
877 clear_bit (EVENT_TX_HALT, &dev->flags);
f29fc259
DB		 878 if (status != -ESHUTDOWN)
879 netif_wake_queue (dev->net);
1da177e4
LT		 880 }
881 }
882 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
883 unlink_urbs (dev, &dev->rxq);
884 status = usb_clear_halt (dev->udev, dev->in);
f29fc259
DB		 885 if (status < 0
886 && status != -EPIPE
887 && status != -ESHUTDOWN) {
1da177e4
LT		 888 if (netif_msg_rx_err (dev))
889 deverr (dev, "can't clear rx halt, status %d",
890 status);
891 } else {
892 clear_bit (EVENT_RX_HALT, &dev->flags);
893 tasklet_schedule (&dev->bh);
894 }
895 }
896
897 /* tasklet could resubmit itself forever if memory is tight */
898 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
899 struct urb *urb = NULL;
900
901 if (netif_running (dev->net))
902 urb = usb_alloc_urb (0, GFP_KERNEL);
903 else
904 clear_bit (EVENT_RX_MEMORY, &dev->flags);
905 if (urb != NULL) {
906 clear_bit (EVENT_RX_MEMORY, &dev->flags);
907 rx_submit (dev, urb, GFP_KERNEL);
908 tasklet_schedule (&dev->bh);
909 }
910 }
911
7ea13c9c
DH		 912 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
913 struct driver_info *info = dev->driver_info;
914 int retval = 0;
915
916 clear_bit (EVENT_LINK_RESET, &dev->flags);
917 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
918 devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s",
919 retval,
920 dev->udev->bus->bus_name, dev->udev->devpath,
921 info->description);
922 }
923 }
924
1da177e4
LT		 925 if (dev->flags)
926 devdbg (dev, "kevent done, flags = 0x%lx",
927 dev->flags);
928}
929
930/*-------------------------------------------------------------------------*/
931
932static void tx_complete (struct urb *urb, struct pt_regs *regs)
933{
934 struct sk_buff *skb = (struct sk_buff *) urb->context;
935 struct skb_data *entry = (struct skb_data *) skb->cb;
936 struct usbnet *dev = entry->dev;
937
938 if (urb->status == 0) {
939 dev->stats.tx_packets++;
940 dev->stats.tx_bytes += entry->length;
941 } else {
942 dev->stats.tx_errors++;
943
944 switch (urb->status) {
945 case -EPIPE:
2e55cc72 946 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1da177e4
LT		 947 break;
948
949 /* software-driven interface shutdown */
950 case -ECONNRESET: // async unlink
951 case -ESHUTDOWN: // hardware gone
952 break;
953
954 // like rx, tx gets controller i/o faults during khubd delays
955 // and so it uses the same throttling mechanism.
956 case -EPROTO: // ehci
957 case -ETIMEDOUT: // ohci
958 case -EILSEQ: // uhci
959 if (!timer_pending (&dev->delay)) {
960 mod_timer (&dev->delay,
961 jiffies + THROTTLE_JIFFIES);
962 if (netif_msg_link (dev))
963 devdbg (dev, "tx throttle %d",
964 urb->status);
965 }
966 netif_stop_queue (dev->net);
967 break;
968 default:
969 if (netif_msg_tx_err (dev))
970 devdbg (dev, "tx err %d", entry->urb->status);
971 break;
972 }
973 }
974
975 urb->dev = NULL;
976 entry->state = tx_done;
8728b834 977 defer_bh(dev, skb, &dev->txq);
1da177e4
LT		 978}
979
980/*-------------------------------------------------------------------------*/
981
982static void usbnet_tx_timeout (struct net_device *net)
983{
984 struct usbnet *dev = netdev_priv(net);
985
986 unlink_urbs (dev, &dev->txq);
987 tasklet_schedule (&dev->bh);
988
989 // FIXME: device recovery -- reset?
990}
991
992/*-------------------------------------------------------------------------*/
993
994static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net)
995{
996 struct usbnet *dev = netdev_priv(net);
997 int length;
998 int retval = NET_XMIT_SUCCESS;
999 struct urb *urb = NULL;
1000 struct skb_data *entry;
1001 struct driver_info *info = dev->driver_info;
1002 unsigned long flags;
1da177e4
LT		 1003
1004 // some devices want funky USB-level framing, for
1005 // win32 driver (usually) and/or hardware quirks
1006 if (info->tx_fixup) {
1007 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1008 if (!skb) {
1009 if (netif_msg_tx_err (dev))
1010 devdbg (dev, "can't tx_fixup skb");
1011 goto drop;
1012 }
1013 }
1014 length = skb->len;
1015
1016 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1017 if (netif_msg_tx_err (dev))
1018 devdbg (dev, "no urb");
1019 goto drop;
1020 }
1021
1022 entry = (struct skb_data *) skb->cb;
1023 entry->urb = urb;
1024 entry->dev = dev;
1025 entry->state = tx_start;
1026 entry->length = length;
1027
1da177e4
LT		 1028 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1029 skb->data, skb->len, tx_complete, skb);
1da177e4
LT		 1030
1031 /* don't assume the hardware handles USB_ZERO_PACKET
1032 * NOTE: strictly conforming cdc-ether devices should expect
1033 * the ZLP here, but ignore the one-byte packet.
1034 *
1035 * FIXME zero that byte, if it doesn't require a new skb.
1036 */
1037 if ((length % dev->maxpacket) == 0)
1038 urb->transfer_buffer_length++;
1039
1040 spin_lock_irqsave (&dev->txq.lock, flags);
1041
1da177e4
LT		 1042 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1043 case -EPIPE:
1044 netif_stop_queue (net);
2e55cc72 1045 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1da177e4
LT		 1046 break;
1047 default:
1048 if (netif_msg_tx_err (dev))
1049 devdbg (dev, "tx: submit urb err %d", retval);
1050 break;
1051 case 0:
1052 net->trans_start = jiffies;
1053 __skb_queue_tail (&dev->txq, skb);
1054 if (dev->txq.qlen >= TX_QLEN (dev))
1055 netif_stop_queue (net);
1056 }
1057 spin_unlock_irqrestore (&dev->txq.lock, flags);
1058
1059 if (retval) {
1060 if (netif_msg_tx_err (dev))
1061 devdbg (dev, "drop, code %d", retval);
1062drop:
1063 retval = NET_XMIT_SUCCESS;
1064 dev->stats.tx_dropped++;
1065 if (skb)
1066 dev_kfree_skb_any (skb);
1067 usb_free_urb (urb);
1068 } else if (netif_msg_tx_queued (dev)) {
1069 devdbg (dev, "> tx, len %d, type 0x%x",
1070 length, skb->protocol);
1071 }
1072 return retval;
1073}
1074
1075
1076/*-------------------------------------------------------------------------*/
1077
1078// tasklet (work deferred from completions, in_irq) or timer
1079
1080static void usbnet_bh (unsigned long param)
1081{
1082 struct usbnet *dev = (struct usbnet *) param;
1083 struct sk_buff *skb;
1084 struct skb_data *entry;
1085
1086 while ((skb = skb_dequeue (&dev->done))) {
1087 entry = (struct skb_data *) skb->cb;
1088 switch (entry->state) {
1089 case rx_done:
1090 entry->state = rx_cleanup;
1091 rx_process (dev, skb);
1092 continue;
1093 case tx_done:
1094 case rx_cleanup:
1095 usb_free_urb (entry->urb);
1096 dev_kfree_skb (skb);
1097 continue;
1098 default:
1099 devdbg (dev, "bogus skb state %d", entry->state);
1100 }
1101 }
1102
1103 // waiting for all pending urbs to complete?
1104 if (dev->wait) {
1105 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1106 wake_up (dev->wait);
1107 }
1108
1109 // or are we maybe short a few urbs?
1110 } else if (netif_running (dev->net)
1111 && netif_device_present (dev->net)
1112 && !timer_pending (&dev->delay)
1113 && !test_bit (EVENT_RX_HALT, &dev->flags)) {
1114 int temp = dev->rxq.qlen;
1115 int qlen = RX_QLEN (dev);
1116
1117 if (temp < qlen) {
1118 struct urb *urb;
1119 int i;
1120
1121 // don't refill the queue all at once
1122 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1123 urb = usb_alloc_urb (0, GFP_ATOMIC);
1124 if (urb != NULL)
1125 rx_submit (dev, urb, GFP_ATOMIC);
1126 }
1127 if (temp != dev->rxq.qlen && netif_msg_link (dev))
1128 devdbg (dev, "rxqlen %d --> %d",
1129 temp, dev->rxq.qlen);
1130 if (dev->rxq.qlen < qlen)
1131 tasklet_schedule (&dev->bh);
1132 }
1133 if (dev->txq.qlen < TX_QLEN (dev))
1134 netif_wake_queue (dev->net);
1135 }
1136}
1137
1138
1139\f
1140/*-------------------------------------------------------------------------
1141 *
1142 * USB Device Driver support
1143 *
1144 *-------------------------------------------------------------------------*/
1145
1146// precondition: never called in_interrupt
1147
38bde1d4 1148void usbnet_disconnect (struct usb_interface *intf)
1da177e4
LT		 1149{
1150 struct usbnet *dev;
1151 struct usb_device *xdev;
1152 struct net_device *net;
1153
1154 dev = usb_get_intfdata(intf);
1155 usb_set_intfdata(intf, NULL);
1156 if (!dev)
1157 return;
1158
1159 xdev = interface_to_usbdev (intf);
1160
1161 if (netif_msg_probe (dev))
38bde1d4
DB		 1162 devinfo (dev, "unregister '%s' usb-%s-%s, %s",
1163 intf->dev.driver->name,
1da177e4
LT		 1164 xdev->bus->bus_name, xdev->devpath,
1165 dev->driver_info->description);
1166
1167 net = dev->net;
1168 unregister_netdev (net);
1169
1170 /* we don't hold rtnl here ... */
1171 flush_scheduled_work ();
1172
1173 if (dev->driver_info->unbind)
1174 dev->driver_info->unbind (dev, intf);
1175
1176 free_netdev(net);
1177 usb_put_dev (xdev);
1178}
38bde1d4 1179EXPORT_SYMBOL_GPL(usbnet_disconnect);
1da177e4
LT		 1180
1181
1182/*-------------------------------------------------------------------------*/
1183
1da177e4
LT		 1184// precondition: never called in_interrupt
1185
38bde1d4 1186int
1da177e4
LT		 1187usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1188{
1189 struct usbnet *dev;
1190 struct net_device *net;
1191 struct usb_host_interface *interface;
1192 struct driver_info *info;
1193 struct usb_device *xdev;
1194 int status;
1195
1196 info = (struct driver_info *) prod->driver_info;
1197 if (!info) {
1198 dev_dbg (&udev->dev, "blacklisted by %s\n", driver_name);
1199 return -ENODEV;
1200 }
1201 xdev = interface_to_usbdev (udev);
1202 interface = udev->cur_altsetting;
1203
1204 usb_get_dev (xdev);
1205
1206 status = -ENOMEM;
1207
1208 // set up our own records
1209 net = alloc_etherdev(sizeof(*dev));
1210 if (!net) {
1211 dbg ("can't kmalloc dev");
1212 goto out;
1213 }
1214
1215 dev = netdev_priv(net);
1216 dev->udev = xdev;
1217 dev->driver_info = info;
1218 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1219 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1220 skb_queue_head_init (&dev->rxq);
1221 skb_queue_head_init (&dev->txq);
1222 skb_queue_head_init (&dev->done);
1223 dev->bh.func = usbnet_bh;
1224 dev->bh.data = (unsigned long) dev;
1225 INIT_WORK (&dev->kevent, kevent, dev);
1226 dev->delay.function = usbnet_bh;
1227 dev->delay.data = (unsigned long) dev;
1228 init_timer (&dev->delay);
1229
1230 SET_MODULE_OWNER (net);
1231 dev->net = net;
1232 strcpy (net->name, "usb%d");
1233 memcpy (net->dev_addr, node_id, sizeof node_id);
1234
2e55cc72
DB		 1235 /* rx and tx sides can use different message sizes;
1236 * bind() should set rx_urb_size in that case.
1237 */
1238 dev->hard_mtu = net->mtu + net->hard_header_len;
1da177e4
LT		 1239#if 0
1240// dma_supported() is deeply broken on almost all architectures
1241 // possible with some EHCI controllers
1242 if (dma_supported (&udev->dev, DMA_64BIT_MASK))
1243 net->features |= NETIF_F_HIGHDMA;
1244#endif
1245
1246 net->change_mtu = usbnet_change_mtu;
1247 net->get_stats = usbnet_get_stats;
1248 net->hard_start_xmit = usbnet_start_xmit;
1249 net->open = usbnet_open;
1250 net->stop = usbnet_stop;
1251 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1252 net->tx_timeout = usbnet_tx_timeout;
1da177e4
LT		 1253 net->ethtool_ops = &usbnet_ethtool_ops;
1254
1255 // allow device-specific bind/init procedures
1256 // NOTE net->name still not usable ...
1257 if (info->bind) {
1258 status = info->bind (dev, udev);
1259 // heuristic: "usb%d" for links we know are two-host,
1260 // else "eth%d" when there's reasonable doubt. userspace
1261 // can rename the link if it knows better.
1262 if ((dev->driver_info->flags & FLAG_ETHER) != 0
1263 && (net->dev_addr [0] & 0x02) == 0)
1264 strcpy (net->name, "eth%d");
f29fc259
DB		 1265
1266 /* maybe the remote can't receive an Ethernet MTU */
1267 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1268 net->mtu = dev->hard_mtu - net->hard_header_len;
2e55cc72
DB		 1269 } else if (!info->in || !info->out)
1270 status = usbnet_get_endpoints (dev, udev);
1da177e4
LT		 1271 else {
1272 dev->in = usb_rcvbulkpipe (xdev, info->in);
1273 dev->out = usb_sndbulkpipe (xdev, info->out);
1274 if (!(info->flags & FLAG_NO_SETINT))
1275 status = usb_set_interface (xdev,
1276 interface->desc.bInterfaceNumber,
1277 interface->desc.bAlternateSetting);
1278 else
1279 status = 0;
1280
1281 }
1da177e4
LT		 1282 if (status == 0 && dev->status)
1283 status = init_status (dev, udev);
1284 if (status < 0)
1285 goto out1;
1286
2e55cc72
DB		 1287 if (!dev->rx_urb_size)
1288 dev->rx_urb_size = dev->hard_mtu;
1da177e4
LT		 1289 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1290
1291 SET_NETDEV_DEV(net, &udev->dev);
1292 status = register_netdev (net);
1293 if (status)
1294 goto out3;
1295 if (netif_msg_probe (dev))
38bde1d4 1296 devinfo (dev, "register '%s' at usb-%s-%s, %s, "
1da177e4 1297 "%02x:%02x:%02x:%02x:%02x:%02x",
38bde1d4 1298 udev->dev.driver->name,
1da177e4
LT		 1299 xdev->bus->bus_name, xdev->devpath,
1300 dev->driver_info->description,
1301 net->dev_addr [0], net->dev_addr [1],
1302 net->dev_addr [2], net->dev_addr [3],
1303 net->dev_addr [4], net->dev_addr [5]);
1304
1305 // ok, it's ready to go.
1306 usb_set_intfdata (udev, dev);
1307
1308 // start as if the link is up
1309 netif_device_attach (net);
1310
1311 return 0;
1312
1313out3:
1314 if (info->unbind)
1315 info->unbind (dev, udev);
1316out1:
1317 free_netdev(net);
1318out:
1319 usb_put_dev(xdev);
1320 return status;
1321}
38bde1d4 1322EXPORT_SYMBOL_GPL(usbnet_probe);
1da177e4
LT		 1323
1324/*-------------------------------------------------------------------------*/
1325
38bde1d4
DB		 1326/* FIXME these suspend/resume methods assume non-CDC style
1327 * devices, with only one interface.
1328 */
1da177e4 1329
38bde1d4 1330int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1da177e4
LT		 1331{
1332 struct usbnet *dev = usb_get_intfdata(intf);
1333
27d72e85
DB		 1334 /* accelerate emptying of the rx and queues, to avoid
1335 * having everything error out.
1336 */
1da177e4 1337 netif_device_detach (dev->net);
27d72e85
DB		 1338 (void) unlink_urbs (dev, &dev->rxq);
1339 (void) unlink_urbs (dev, &dev->txq);
1340 intf->dev.power.power_state = PMSG_SUSPEND;
1da177e4
LT		 1341 return 0;
1342}
38bde1d4 1343EXPORT_SYMBOL_GPL(usbnet_suspend);
1da177e4 1344
38bde1d4 1345int usbnet_resume (struct usb_interface *intf)
1da177e4
LT		 1346{
1347 struct usbnet *dev = usb_get_intfdata(intf);
1348
27d72e85 1349 intf->dev.power.power_state = PMSG_ON;
1da177e4 1350 netif_device_attach (dev->net);
27d72e85 1351 tasklet_schedule (&dev->bh);
1da177e4
LT		 1352 return 0;
1353}
38bde1d4 1354EXPORT_SYMBOL_GPL(usbnet_resume);
1da177e4 1355
1da177e4
LT		 1356
1357/*-------------------------------------------------------------------------*/
1358
1359#ifndef HAVE_HARDWARE
1360#error You need to configure some hardware for this driver
1361#endif
1362
1363/*
1364 * chip vendor names won't normally be on the cables, and
1365 * may not be on the device.
1366 */
1367
1368static const struct usb_device_id products [] = {
1369
1da177e4
LT		 1370#ifdef CONFIG_USB_PL2301
1371{
1372 USB_DEVICE (0x067b, 0x0000), // PL-2301
1373 .driver_info = (unsigned long) &prolific_info,
1374}, {
1375 USB_DEVICE (0x067b, 0x0001), // PL-2302
1376 .driver_info = (unsigned long) &prolific_info,
1377},
1da177e4 1378#endif
1da177e4
LT		 1379 { }, // END
1380};
1381MODULE_DEVICE_TABLE (usb, products);
1382
1383static struct usb_driver usbnet_driver = {
1384 .owner = THIS_MODULE,
1385 .name = driver_name,
1386 .id_table = products,
1387 .probe = usbnet_probe,
1388 .disconnect = usbnet_disconnect,
1389 .suspend = usbnet_suspend,
1390 .resume = usbnet_resume,
1391};
1392
1da177e4
LT		 1393/*-------------------------------------------------------------------------*/
1394
f29fc259 1395static int __init usbnet_init(void)
1da177e4
LT		 1396{
1397 // compiler should optimize these out
1398 BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1399 < sizeof (struct skb_data));
1da177e4
LT		 1400
1401 random_ether_addr(node_id);
1402
1403 return usb_register(&usbnet_driver);
1404}
f29fc259 1405module_init(usbnet_init);
1da177e4 1406
f29fc259 1407static void __exit usbnet_exit(void)
1da177e4 1408{
f29fc259 1409 usb_deregister(&usbnet_driver);
1da177e4 1410}
f29fc259 1411module_exit(usbnet_exit);
1da177e4 1412
f29fc259
DB		 1413MODULE_AUTHOR("David Brownell");
1414MODULE_DESCRIPTION("USB Host-to-Host Link Drivers (numerous vendors)");
1415MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)