blob: cb04f900cc461990255cd788d92437ddc1ce4afa [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
David Brownell090ffa92005-08-31 09:54:50 -07002 * USB Network driver infrastructure
David Brownellf29fc252005-08-31 09:52:31 -07003 * Copyright (C) 2000-2005 by David Brownell
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
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
David Brownell090ffa92005-08-31 09:54:50 -070023 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 *
David Brownell090ffa92005-08-31 09:54:50 -070026 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
31 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33// #define DEBUG // error path messages, extra info
34// #define VERBOSE // more; success messages
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/init.h>
38#include <linux/netdevice.h>
39#include <linux/etherdevice.h>
Peter Holik03ad0322009-04-18 07:24:17 +000040#include <linux/ctype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/ethtool.h>
42#include <linux/workqueue.h>
43#include <linux/mii.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/usb.h>
Jussi Kivilinna3692e942008-01-26 00:51:45 +020045#include <linux/usb/usbnet.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090046#include <linux/slab.h>
Andy Shevchenkofd1f1702010-07-23 03:18:08 +000047#include <linux/kernel.h>
Ming Leib0786b42010-11-01 07:11:54 -070048#include <linux/pm_runtime.h>
David Brownellf29fc252005-08-31 09:52:31 -070049
50#define DRIVER_VERSION "22-Aug-2005"
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52
53/*-------------------------------------------------------------------------*/
54
55/*
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
David Brownellf29fc252005-08-31 09:52:31 -070061 *
62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
63 * let the USB host controller be busy for 5msec or more before an irq
64 * is required, under load. Jumbograms change the equation.
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 */
Jamie Paintera99c1942006-07-27 14:17:28 -040066#define RX_MAX_QUEUE_MEMORY (60 * 1518)
67#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
69#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Linus Torvalds1da177e2005-04-16 15:20:36 -070072// reawaken network queue this soon after stopping; else watchdog barks
73#define TX_TIMEOUT_JIFFIES (5*HZ)
74
75// throttle rx/tx briefly after some faults, so khubd might disconnect()
76// us (it polls at HZ/4 usually) before we report too many false errors.
77#define THROTTLE_JIFFIES (HZ/8)
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079// between wakeups
80#define UNLINK_TIMEOUT_MS 3
81
82/*-------------------------------------------------------------------------*/
83
84// randomly generated ethernet address
85static u8 node_id [ETH_ALEN];
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087static const char driver_name [] = "usbnet";
88
89/* use ethtool to change the level for any given device */
90static int msg_level = -1;
91module_param (msg_level, int, 0);
92MODULE_PARM_DESC (msg_level, "Override default message level");
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094/*-------------------------------------------------------------------------*/
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/* handles CDC Ethernet and many other network "bulk data" interfaces */
David Brownell2e55cc72005-08-31 09:53:10 -070097int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
99 int tmp;
100 struct usb_host_interface *alt = NULL;
101 struct usb_host_endpoint *in = NULL, *out = NULL;
102 struct usb_host_endpoint *status = NULL;
103
104 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
105 unsigned ep;
106
107 in = out = status = NULL;
108 alt = intf->altsetting + tmp;
109
110 /* take the first altsetting with in-bulk + out-bulk;
111 * remember any status endpoint, just in case;
Justin P. Mattock70f23fd2011-05-10 10:16:21 +0200112 * ignore other endpoints and altsettings.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 */
114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
115 struct usb_host_endpoint *e;
116 int intr = 0;
117
118 e = alt->endpoint + ep;
119 switch (e->desc.bmAttributes) {
120 case USB_ENDPOINT_XFER_INT:
Luiz Fernando N. Capitulinofc6e2542006-10-26 13:03:01 -0300121 if (!usb_endpoint_dir_in(&e->desc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 continue;
123 intr = 1;
124 /* FALLTHROUGH */
125 case USB_ENDPOINT_XFER_BULK:
126 break;
127 default:
128 continue;
129 }
Luiz Fernando N. Capitulinofc6e2542006-10-26 13:03:01 -0300130 if (usb_endpoint_dir_in(&e->desc)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (!intr && !in)
132 in = e;
133 else if (intr && !status)
134 status = e;
135 } else {
136 if (!out)
137 out = e;
138 }
139 }
140 if (in && out)
141 break;
142 }
143 if (!alt || !in || !out)
144 return -EINVAL;
145
Joe Perches8e95a202009-12-03 07:58:21 +0000146 if (alt->desc.bAlternateSetting != 0 ||
147 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
149 alt->desc.bAlternateSetting);
150 if (tmp < 0)
151 return tmp;
152 }
David Brownellcb1cebb2007-02-15 18:52:30 -0800153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 dev->in = usb_rcvbulkpipe (dev->udev,
155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->out = usb_sndbulkpipe (dev->udev,
157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
158 dev->status = status;
159 return 0;
160}
David Brownell2e55cc72005-08-31 09:53:10 -0700161EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Peter Holik03ad0322009-04-18 07:24:17 +0000163int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
164{
165 int tmp, i;
166 unsigned char buf [13];
167
168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
169 if (tmp != 12) {
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
172 if (tmp >= 0)
173 tmp = -EINVAL;
174 return tmp;
175 }
176 for (i = tmp = 0; i < 6; i++, tmp += 2)
177 dev->net->dev_addr [i] =
Andy Shevchenkofd1f1702010-07-23 03:18:08 +0000178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
Peter Holik03ad0322009-04-18 07:24:17 +0000179 return 0;
180}
181EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
182
tom.leiming@gmail.com24ead292012-06-11 15:19:44 +0000183static void intr_complete (struct urb *urb)
184{
185 struct usbnet *dev = urb->context;
186 int status = urb->status;
187
188 switch (status) {
189 /* success */
190 case 0:
191 dev->driver_info->status(dev, urb);
192 break;
193
194 /* software-driven interface shutdown */
195 case -ENOENT: /* urb killed */
196 case -ESHUTDOWN: /* hardware gone */
197 netif_dbg(dev, ifdown, dev->net,
198 "intr shutdown, code %d\n", status);
199 return;
200
201 /* NOTE: not throttling like RX/TX, since this endpoint
202 * already polls infrequently
203 */
204 default:
205 netdev_dbg(dev->net, "intr status %d\n", status);
206 break;
207 }
208
209 if (!netif_running (dev->net))
210 return;
211
tom.leiming@gmail.com24ead292012-06-11 15:19:44 +0000212 status = usb_submit_urb (urb, GFP_ATOMIC);
213 if (status != 0)
214 netif_err(dev, timer, dev->net,
215 "intr resubmit --> %d\n", status);
216}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218static int init_status (struct usbnet *dev, struct usb_interface *intf)
219{
220 char *buf = NULL;
221 unsigned pipe = 0;
222 unsigned maxp;
223 unsigned period;
224
225 if (!dev->driver_info->status)
226 return 0;
227
228 pipe = usb_rcvintpipe (dev->udev,
229 dev->status->desc.bEndpointAddress
230 & USB_ENDPOINT_NUMBER_MASK);
231 maxp = usb_maxpacket (dev->udev, pipe, 0);
232
233 /* avoid 1 msec chatter: min 8 msec poll rate */
234 period = max ((int) dev->status->desc.bInterval,
235 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
236
Christoph Lametere94b1762006-12-06 20:33:17 -0800237 buf = kmalloc (maxp, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 if (buf) {
Christoph Lametere94b1762006-12-06 20:33:17 -0800239 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 if (!dev->interrupt) {
241 kfree (buf);
242 return -ENOMEM;
243 } else {
244 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
245 buf, maxp, intr_complete, dev, period);
tom.leiming@gmail.com720f3d72012-04-29 22:51:02 +0000246 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 dev_dbg(&intf->dev,
248 "status ep%din, %d bytes period %d\n",
249 usb_pipeendpoint(pipe), maxp, period);
250 }
251 }
David Brownell18ab4582007-05-25 12:31:32 -0700252 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
David Brownell2e55cc72005-08-31 09:53:10 -0700255/* Passes this packet up the stack, updating its accounting.
256 * Some link protocols batch packets, so their rx_fixup paths
257 * can return clones as well as just modify the original skb.
258 */
259void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
261 int status;
262
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300263 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
264 skb_queue_tail(&dev->rxq_pause, skb);
265 return;
266 }
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 skb->protocol = eth_type_trans (skb, dev->net);
Herbert Xu79638372009-06-29 16:53:28 +0000269 dev->net->stats.rx_packets++;
270 dev->net->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Joe Perchesa475f602010-02-17 10:30:24 +0000272 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
273 skb->len + sizeof (struct ethhdr), skb->protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 memset (skb->cb, 0, sizeof (struct skb_data));
Michael Rieschf9b491e2011-09-29 04:06:26 +0000275
276 if (skb_defer_rx_timestamp(skb))
277 return;
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 status = netif_rx (skb);
Joe Perchesa475f602010-02-17 10:30:24 +0000280 if (status != NET_RX_SUCCESS)
281 netif_dbg(dev, rx_err, dev->net,
282 "netif_rx status %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
David Brownell2e55cc72005-08-31 09:53:10 -0700284EXPORT_SYMBOL_GPL(usbnet_skb_return);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287/*-------------------------------------------------------------------------
288 *
289 * Network Device Driver (peer link to "Host Device", from USB host)
290 *
291 *-------------------------------------------------------------------------*/
292
Stephen Hemminger777baa42009-03-20 19:35:54 +0000293int usbnet_change_mtu (struct net_device *net, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
295 struct usbnet *dev = netdev_priv(net);
David Brownellf29fc252005-08-31 09:52:31 -0700296 int ll_mtu = new_mtu + net->hard_header_len;
Jamie Paintera99c1942006-07-27 14:17:28 -0400297 int old_hard_mtu = dev->hard_mtu;
298 int old_rx_urb_size = dev->rx_urb_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Jamie Paintera99c1942006-07-27 14:17:28 -0400300 if (new_mtu <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 // no second zero-length packet read wanted after mtu-sized packets
David Brownellf29fc252005-08-31 09:52:31 -0700303 if ((ll_mtu % dev->maxpacket) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 return -EDOM;
305 net->mtu = new_mtu;
Jamie Paintera99c1942006-07-27 14:17:28 -0400306
307 dev->hard_mtu = net->mtu + net->hard_header_len;
308 if (dev->rx_urb_size == old_hard_mtu) {
309 dev->rx_urb_size = dev->hard_mtu;
310 if (dev->rx_urb_size > old_rx_urb_size)
311 usbnet_unlink_rx_urbs(dev);
312 }
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 return 0;
315}
Stephen Hemminger777baa42009-03-20 19:35:54 +0000316EXPORT_SYMBOL_GPL(usbnet_change_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800318/* The caller must hold list->lock */
319static void __usbnet_queue_skb(struct sk_buff_head *list,
320 struct sk_buff *newsk, enum skb_state state)
321{
322 struct skb_data *entry = (struct skb_data *) newsk->cb;
323
324 __skb_queue_tail(list, newsk);
325 entry->state = state;
326}
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328/*-------------------------------------------------------------------------*/
329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
331 * completion callbacks. 2.5 should have fixed those bugs...
332 */
333
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800334static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
335 struct sk_buff_head *list, enum skb_state state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 unsigned long flags;
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800338 enum skb_state old_state;
339 struct skb_data *entry = (struct skb_data *) skb->cb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
David S. Miller8728b832005-08-09 19:25:21 -0700341 spin_lock_irqsave(&list->lock, flags);
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800342 old_state = entry->state;
343 entry->state = state;
David S. Miller8728b832005-08-09 19:25:21 -0700344 __skb_unlink(skb, list);
345 spin_unlock(&list->lock);
346 spin_lock(&dev->done.lock);
347 __skb_queue_tail(&dev->done, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 if (dev->done.qlen == 1)
David S. Miller8728b832005-08-09 19:25:21 -0700349 tasklet_schedule(&dev->bh);
350 spin_unlock_irqrestore(&dev->done.lock, flags);
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800351 return old_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
354/* some work can't be done in tasklets, so we use keventd
355 *
356 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
357 * but tasklet_schedule() doesn't. hope the failure is rare.
358 */
David Brownell2e55cc72005-08-31 09:53:10 -0700359void usbnet_defer_kevent (struct usbnet *dev, int work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
361 set_bit (work, &dev->flags);
362 if (!schedule_work (&dev->kevent))
Joe Perches60b86752010-02-17 10:30:23 +0000363 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 else
Joe Perches60b86752010-02-17 10:30:23 +0000365 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366}
David Brownell2e55cc72005-08-31 09:53:10 -0700367EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369/*-------------------------------------------------------------------------*/
370
David Howells7d12e782006-10-05 14:55:46 +0100371static void rx_complete (struct urb *urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
David S. Millerdacb3972010-08-10 02:50:55 -0700373static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374{
375 struct sk_buff *skb;
376 struct skb_data *entry;
377 int retval = 0;
378 unsigned long lockflags;
David Brownell2e55cc72005-08-31 09:53:10 -0700379 size_t size = dev->rx_urb_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Eric Dumazet7bdd4022012-03-14 06:56:25 +0000381 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
382 if (!skb) {
Joe Perchesa475f602010-02-17 10:30:24 +0000383 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
David Brownell2e55cc72005-08-31 09:53:10 -0700384 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 usb_free_urb (urb);
David S. Millerdacb3972010-08-10 02:50:55 -0700386 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
389 entry = (struct skb_data *) skb->cb;
390 entry->urb = urb;
391 entry->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 entry->length = 0;
393
394 usb_fill_bulk_urb (urb, dev->udev, dev->in,
395 skb->data, size, rx_complete, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
397 spin_lock_irqsave (&dev->rxq.lock, lockflags);
398
Joe Perches8e95a202009-12-03 07:58:21 +0000399 if (netif_running (dev->net) &&
400 netif_device_present (dev->net) &&
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800401 !test_bit (EVENT_RX_HALT, &dev->flags) &&
402 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
David Brownell18ab4582007-05-25 12:31:32 -0700403 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 case -EPIPE:
David Brownell2e55cc72005-08-31 09:53:10 -0700405 usbnet_defer_kevent (dev, EVENT_RX_HALT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 break;
407 case -ENOMEM:
David Brownell2e55cc72005-08-31 09:53:10 -0700408 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 break;
410 case -ENODEV:
Joe Perchesa475f602010-02-17 10:30:24 +0000411 netif_dbg(dev, ifdown, dev->net, "device gone\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 netif_device_detach (dev->net);
413 break;
David S. Millerdacb3972010-08-10 02:50:55 -0700414 case -EHOSTUNREACH:
415 retval = -ENOLINK;
416 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 default:
Joe Perchesa475f602010-02-17 10:30:24 +0000418 netif_dbg(dev, rx_err, dev->net,
419 "rx submit, %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 tasklet_schedule (&dev->bh);
421 break;
422 case 0:
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800423 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 }
425 } else {
Joe Perchesa475f602010-02-17 10:30:24 +0000426 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 retval = -ENOLINK;
428 }
429 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
430 if (retval) {
431 dev_kfree_skb_any (skb);
432 usb_free_urb (urb);
433 }
David S. Millerdacb3972010-08-10 02:50:55 -0700434 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435}
436
437
438/*-------------------------------------------------------------------------*/
439
440static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
441{
Joe Perches8e95a202009-12-03 07:58:21 +0000442 if (dev->driver_info->rx_fixup &&
Andrzej Zaborowski7a635ea2011-03-28 12:56:33 +0000443 !dev->driver_info->rx_fixup (dev, skb)) {
444 /* With RX_ASSEMBLE, rx_fixup() must update counters */
445 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
446 dev->net->stats.rx_errors++;
447 goto done;
448 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 // else network stack removes extra byte if we forced a short packet
450
Alexey Orishko073285f2010-11-29 23:23:27 +0000451 if (skb->len) {
452 /* all data was already cloned from skb inside the driver */
453 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
454 dev_kfree_skb_any(skb);
455 else
456 usbnet_skb_return(dev, skb);
457 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 }
Alexey Orishko073285f2010-11-29 23:23:27 +0000459
460 netif_dbg(dev, rx_err, dev->net, "drop\n");
Alexey Orishko073285f2010-11-29 23:23:27 +0000461 dev->net->stats.rx_errors++;
Andrzej Zaborowski7a635ea2011-03-28 12:56:33 +0000462done:
Alexey Orishko073285f2010-11-29 23:23:27 +0000463 skb_queue_tail(&dev->done, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464}
465
466/*-------------------------------------------------------------------------*/
467
David Howells7d12e782006-10-05 14:55:46 +0100468static void rx_complete (struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
470 struct sk_buff *skb = (struct sk_buff *) urb->context;
471 struct skb_data *entry = (struct skb_data *) skb->cb;
472 struct usbnet *dev = entry->dev;
473 int urb_status = urb->status;
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800474 enum skb_state state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476 skb_put (skb, urb->actual_length);
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800477 state = rx_done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 entry->urb = NULL;
479
480 switch (urb_status) {
David Brownell18ab4582007-05-25 12:31:32 -0700481 /* success */
482 case 0:
David Brownellf29fc252005-08-31 09:52:31 -0700483 if (skb->len < dev->net->hard_header_len) {
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800484 state = rx_cleanup;
Herbert Xu79638372009-06-29 16:53:28 +0000485 dev->net->stats.rx_errors++;
486 dev->net->stats.rx_length_errors++;
Joe Perchesa475f602010-02-17 10:30:24 +0000487 netif_dbg(dev, rx_err, dev->net,
488 "rx length %d\n", skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 }
490 break;
491
David Brownell18ab4582007-05-25 12:31:32 -0700492 /* stalls need manual reset. this is rare ... except that
493 * when going through USB 2.0 TTs, unplug appears this way.
Jean Delvare3ac49a12009-06-04 16:20:28 +0200494 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
David Brownell18ab4582007-05-25 12:31:32 -0700495 * storm, recovering as needed.
496 */
497 case -EPIPE:
Herbert Xu79638372009-06-29 16:53:28 +0000498 dev->net->stats.rx_errors++;
David Brownell2e55cc72005-08-31 09:53:10 -0700499 usbnet_defer_kevent (dev, EVENT_RX_HALT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 // FALLTHROUGH
501
David Brownell18ab4582007-05-25 12:31:32 -0700502 /* software-driven interface shutdown */
503 case -ECONNRESET: /* async unlink */
504 case -ESHUTDOWN: /* hardware gone */
Joe Perchesa475f602010-02-17 10:30:24 +0000505 netif_dbg(dev, ifdown, dev->net,
506 "rx shutdown, code %d\n", urb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 goto block;
508
David Brownell18ab4582007-05-25 12:31:32 -0700509 /* we get controller i/o faults during khubd disconnect() delays.
510 * throttle down resubmits, to avoid log floods; just temporarily,
511 * so we still recover when the fault isn't a khubd delay.
512 */
513 case -EPROTO:
514 case -ETIME:
515 case -EILSEQ:
Herbert Xu79638372009-06-29 16:53:28 +0000516 dev->net->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 if (!timer_pending (&dev->delay)) {
518 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
Joe Perchesa475f602010-02-17 10:30:24 +0000519 netif_dbg(dev, link, dev->net,
520 "rx throttle %d\n", urb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 }
522block:
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800523 state = rx_cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 entry->urb = urb;
525 urb = NULL;
526 break;
527
David Brownell18ab4582007-05-25 12:31:32 -0700528 /* data overrun ... flush fifo? */
529 case -EOVERFLOW:
Herbert Xu79638372009-06-29 16:53:28 +0000530 dev->net->stats.rx_over_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 // FALLTHROUGH
David Brownellcb1cebb2007-02-15 18:52:30 -0800532
David Brownell18ab4582007-05-25 12:31:32 -0700533 default:
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800534 state = rx_cleanup;
Herbert Xu79638372009-06-29 16:53:28 +0000535 dev->net->stats.rx_errors++;
Joe Perchesa475f602010-02-17 10:30:24 +0000536 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 break;
538 }
539
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800540 state = defer_bh(dev, skb, &dev->rxq, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542 if (urb) {
Joe Perches8e95a202009-12-03 07:58:21 +0000543 if (netif_running (dev->net) &&
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800544 !test_bit (EVENT_RX_HALT, &dev->flags) &&
545 state != unlink_start) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 rx_submit (dev, urb, GFP_ATOMIC);
Oliver Neukum8a783352012-03-03 18:45:07 +0100547 usb_mark_last_busy(dev->udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return;
549 }
550 usb_free_urb (urb);
551 }
Joe Perchesa475f602010-02-17 10:30:24 +0000552 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555/*-------------------------------------------------------------------------*/
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300556void usbnet_pause_rx(struct usbnet *dev)
557{
558 set_bit(EVENT_RX_PAUSED, &dev->flags);
559
Joe Perchesa475f602010-02-17 10:30:24 +0000560 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300561}
562EXPORT_SYMBOL_GPL(usbnet_pause_rx);
563
564void usbnet_resume_rx(struct usbnet *dev)
565{
566 struct sk_buff *skb;
567 int num = 0;
568
569 clear_bit(EVENT_RX_PAUSED, &dev->flags);
570
571 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
572 usbnet_skb_return(dev, skb);
573 num++;
574 }
575
576 tasklet_schedule(&dev->bh);
577
Joe Perchesa475f602010-02-17 10:30:24 +0000578 netif_dbg(dev, rx_status, dev->net,
579 "paused rx queue disabled, %d skbs requeued\n", num);
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300580}
581EXPORT_SYMBOL_GPL(usbnet_resume_rx);
582
583void usbnet_purge_paused_rxq(struct usbnet *dev)
584{
585 skb_queue_purge(&dev->rxq_pause);
586}
587EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
588
589/*-------------------------------------------------------------------------*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
591// unlink pending rx/tx; completion handlers do all other cleanup
592
593static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
594{
595 unsigned long flags;
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800596 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 int count = 0;
598
599 spin_lock_irqsave (&q->lock, flags);
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800600 while (!skb_queue_empty(q)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 struct skb_data *entry;
602 struct urb *urb;
603 int retval;
604
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800605 skb_queue_walk(q, skb) {
606 entry = (struct skb_data *) skb->cb;
607 if (entry->state != unlink_start)
608 goto found;
609 }
610 break;
611found:
612 entry->state = unlink_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 urb = entry->urb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
tom.leiming@gmail.com0956a8c2012-03-22 03:22:18 +0000615 /*
616 * Get reference count of the URB to avoid it to be
617 * freed during usb_unlink_urb, which may trigger
618 * use-after-free problem inside usb_unlink_urb since
619 * usb_unlink_urb is always racing with .complete
620 * handler(include defer_bh).
621 */
622 usb_get_urb(urb);
Sebastian Siewior4231d472012-03-07 10:19:28 +0000623 spin_unlock_irqrestore(&q->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 // during some PM-driven resume scenarios,
625 // these (async) unlinks complete immediately
626 retval = usb_unlink_urb (urb);
627 if (retval != -EINPROGRESS && retval != 0)
Joe Perches60b86752010-02-17 10:30:23 +0000628 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 else
630 count++;
tom.leiming@gmail.com0956a8c2012-03-22 03:22:18 +0000631 usb_put_urb(urb);
Sebastian Siewior4231d472012-03-07 10:19:28 +0000632 spin_lock_irqsave(&q->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 }
634 spin_unlock_irqrestore (&q->lock, flags);
635 return count;
636}
637
Jamie Paintera99c1942006-07-27 14:17:28 -0400638// Flush all pending rx urbs
639// minidrivers may need to do this when the MTU changes
640
641void usbnet_unlink_rx_urbs(struct usbnet *dev)
642{
643 if (netif_running(dev->net)) {
644 (void) unlink_urbs (dev, &dev->rxq);
645 tasklet_schedule(&dev->bh);
646 }
647}
648EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
650/*-------------------------------------------------------------------------*/
651
652// precondition: never called in_interrupt
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800653static void usbnet_terminate_urbs(struct usbnet *dev)
654{
655 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
656 DECLARE_WAITQUEUE(wait, current);
657 int temp;
658
659 /* ensure there are no more active urbs */
660 add_wait_queue(&unlink_wakeup, &wait);
661 set_current_state(TASK_UNINTERRUPTIBLE);
662 dev->wait = &unlink_wakeup;
663 temp = unlink_urbs(dev, &dev->txq) +
664 unlink_urbs(dev, &dev->rxq);
665
666 /* maybe wait for deletions to finish. */
667 while (!skb_queue_empty(&dev->rxq)
668 && !skb_queue_empty(&dev->txq)
669 && !skb_queue_empty(&dev->done)) {
Kulikov Vasiliy66cc42a42010-07-25 22:25:42 +0000670 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800671 set_current_state(TASK_UNINTERRUPTIBLE);
Joe Perchesa475f602010-02-17 10:30:24 +0000672 netif_dbg(dev, ifdown, dev->net,
673 "waited for %d urb completions\n", temp);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800674 }
675 set_current_state(TASK_RUNNING);
676 dev->wait = NULL;
677 remove_wait_queue(&unlink_wakeup, &wait);
678}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
Stephen Hemminger777baa42009-03-20 19:35:54 +0000680int usbnet_stop (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
682 struct usbnet *dev = netdev_priv(net);
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300683 struct driver_info *info = dev->driver_info;
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300684 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
Ming Lei75bd0cb2011-04-28 22:37:09 +0000686 clear_bit(EVENT_DEV_OPEN, &dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 netif_stop_queue (net);
688
Joe Perchesa475f602010-02-17 10:30:24 +0000689 netif_info(dev, ifdown, dev->net,
Ben Hutchings8ccef432010-06-08 08:20:59 +0000690 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
Joe Perchesa475f602010-02-17 10:30:24 +0000691 net->stats.rx_packets, net->stats.tx_packets,
692 net->stats.rx_errors, net->stats.tx_errors);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300694 /* allow minidriver to stop correctly (wireless devices to turn off
695 * radio etc) */
696 if (info->stop) {
697 retval = info->stop(dev);
Joe Perchesa475f602010-02-17 10:30:24 +0000698 if (retval < 0)
699 netif_info(dev, ifdown, dev->net,
700 "stop fail (%d) usbnet usb-%s-%s, %s\n",
701 retval,
702 dev->udev->bus->bus_name, dev->udev->devpath,
703 info->description);
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300704 }
705
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800706 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
707 usbnet_terminate_urbs(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
709 usb_kill_urb(dev->interrupt);
710
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300711 usbnet_purge_paused_rxq(dev);
712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 /* deferred work (task, timer, softirq) must also stop.
714 * can't flush_scheduled_work() until we drop rtnl (later),
715 * else workers could deadlock; so make workers a NOP.
716 */
717 dev->flags = 0;
718 del_timer_sync (&dev->delay);
719 tasklet_kill (&dev->bh);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800720 if (info->manage_power)
721 info->manage_power(dev, 0);
722 else
723 usb_autopm_put_interface(dev->intf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
725 return 0;
726}
Stephen Hemminger777baa42009-03-20 19:35:54 +0000727EXPORT_SYMBOL_GPL(usbnet_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729/*-------------------------------------------------------------------------*/
730
731// posts reads, and enables write queuing
732
733// precondition: never called in_interrupt
734
Stephen Hemminger777baa42009-03-20 19:35:54 +0000735int usbnet_open (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736{
737 struct usbnet *dev = netdev_priv(net);
Oliver Neukuma11a6542007-08-03 13:52:19 +0200738 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 struct driver_info *info = dev->driver_info;
740
Oliver Neukuma11a6542007-08-03 13:52:19 +0200741 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000742 netif_info(dev, ifup, dev->net,
743 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
744 retval,
745 dev->udev->bus->bus_name,
746 dev->udev->devpath,
747 info->description);
Oliver Neukuma11a6542007-08-03 13:52:19 +0200748 goto done_nopm;
749 }
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 // put into "known safe" state
752 if (info->reset && (retval = info->reset (dev)) < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000753 netif_info(dev, ifup, dev->net,
754 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
755 retval,
756 dev->udev->bus->bus_name,
757 dev->udev->devpath,
758 info->description);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 goto done;
760 }
761
762 // insist peer be connected
763 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000764 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 goto done;
766 }
767
768 /* start any status interrupt transfer */
769 if (dev->interrupt) {
770 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
771 if (retval < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000772 netif_err(dev, ifup, dev->net,
773 "intr submit %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 goto done;
775 }
776 }
777
Paul Stewart68972ef2011-04-28 05:43:37 +0000778 set_bit(EVENT_DEV_OPEN, &dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 netif_start_queue (net);
Joe Perchesa475f602010-02-17 10:30:24 +0000780 netif_info(dev, ifup, dev->net,
781 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
782 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
783 dev->net->mtu,
784 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
785 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
786 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
787 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
788 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
789 "simple");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
791 // delay posting reads until we're fully open
792 tasklet_schedule (&dev->bh);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800793 if (info->manage_power) {
794 retval = info->manage_power(dev, 1);
795 if (retval < 0)
Ming Leifb13c472012-06-19 21:15:51 +0000796 goto done_manage_power_error;
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800797 usb_autopm_put_interface(dev->intf);
798 }
Oliver Neukuma11a6542007-08-03 13:52:19 +0200799 return retval;
Joe Perchesa475f602010-02-17 10:30:24 +0000800
Ming Leifb13c472012-06-19 21:15:51 +0000801done_manage_power_error:
802 clear_bit(EVENT_DEV_OPEN, &dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803done:
Oliver Neukuma11a6542007-08-03 13:52:19 +0200804 usb_autopm_put_interface(dev->intf);
805done_nopm:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 return retval;
807}
Stephen Hemminger777baa42009-03-20 19:35:54 +0000808EXPORT_SYMBOL_GPL(usbnet_open);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
810/*-------------------------------------------------------------------------*/
811
David Brownell2e55cc72005-08-31 09:53:10 -0700812/* ethtool methods; minidrivers may need to add some more, but
813 * they'll probably want to use this base set.
814 */
815
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200816int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
817{
818 struct usbnet *dev = netdev_priv(net);
819
820 if (!dev->mii.mdio_read)
821 return -EOPNOTSUPP;
822
823 return mii_ethtool_gset(&dev->mii, cmd);
824}
825EXPORT_SYMBOL_GPL(usbnet_get_settings);
826
827int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
828{
829 struct usbnet *dev = netdev_priv(net);
830 int retval;
831
832 if (!dev->mii.mdio_write)
833 return -EOPNOTSUPP;
834
835 retval = mii_ethtool_sset(&dev->mii, cmd);
836
837 /* link speed/duplex might have changed */
838 if (dev->driver_info->link_reset)
839 dev->driver_info->link_reset(dev);
840
841 return retval;
842
843}
844EXPORT_SYMBOL_GPL(usbnet_set_settings);
845
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200846u32 usbnet_get_link (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847{
848 struct usbnet *dev = netdev_priv(net);
849
David Brownellf29fc252005-08-31 09:52:31 -0700850 /* If a check_connect is defined, return its result */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 if (dev->driver_info->check_connect)
852 return dev->driver_info->check_connect (dev) == 0;
853
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200854 /* if the device has mii operations, use those */
855 if (dev->mii.mdio_read)
856 return mii_link_ok(&dev->mii);
857
Bjørn Mork05ffb3e2009-03-01 20:45:40 -0800858 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
859 return ethtool_op_get_link(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860}
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200861EXPORT_SYMBOL_GPL(usbnet_get_link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
David Brownell18ee91fa2006-11-02 12:29:12 -0800863int usbnet_nway_reset(struct net_device *net)
864{
865 struct usbnet *dev = netdev_priv(net);
866
867 if (!dev->mii.mdio_write)
868 return -EOPNOTSUPP;
869
870 return mii_nway_restart(&dev->mii);
871}
872EXPORT_SYMBOL_GPL(usbnet_nway_reset);
873
David Brownell18ee91fa2006-11-02 12:29:12 -0800874void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
875{
876 struct usbnet *dev = netdev_priv(net);
877
Phil Sutter86a2f412012-06-14 01:18:42 +0000878 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
879 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
880 strlcpy (info->fw_version, dev->driver_info->description,
David Brownell18ee91fa2006-11-02 12:29:12 -0800881 sizeof info->fw_version);
882 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
883}
884EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
885
David Brownell2e55cc72005-08-31 09:53:10 -0700886u32 usbnet_get_msglevel (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
888 struct usbnet *dev = netdev_priv(net);
889
890 return dev->msg_enable;
891}
David Brownell2e55cc72005-08-31 09:53:10 -0700892EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
David Brownell2e55cc72005-08-31 09:53:10 -0700894void usbnet_set_msglevel (struct net_device *net, u32 level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
896 struct usbnet *dev = netdev_priv(net);
897
898 dev->msg_enable = level;
899}
David Brownell2e55cc72005-08-31 09:53:10 -0700900EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
David Brownell2e55cc72005-08-31 09:53:10 -0700902/* drivers may override default ethtool_ops in their bind() routine */
Stephen Hemminger0fc0b732009-09-02 01:03:33 -0700903static const struct ethtool_ops usbnet_ethtool_ops = {
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200904 .get_settings = usbnet_get_settings,
905 .set_settings = usbnet_set_settings,
David Brownell2e55cc72005-08-31 09:53:10 -0700906 .get_link = usbnet_get_link,
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200907 .nway_reset = usbnet_nway_reset,
David Brownell18ee91fa2006-11-02 12:29:12 -0800908 .get_drvinfo = usbnet_get_drvinfo,
David Brownell2e55cc72005-08-31 09:53:10 -0700909 .get_msglevel = usbnet_get_msglevel,
910 .set_msglevel = usbnet_set_msglevel,
Richard Cochran123edb12012-04-03 22:59:41 +0000911 .get_ts_info = ethtool_op_get_ts_info,
David Brownell2e55cc72005-08-31 09:53:10 -0700912};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
914/*-------------------------------------------------------------------------*/
915
916/* work that cannot be done in interrupt context uses keventd.
917 *
918 * NOTE: with 2.5 we could do more of this using completion callbacks,
919 * especially now that control transfers can be queued.
920 */
921static void
David Howellsc4028952006-11-22 14:57:56 +0000922kevent (struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923{
David Howellsc4028952006-11-22 14:57:56 +0000924 struct usbnet *dev =
925 container_of(work, struct usbnet, kevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 int status;
927
928 /* usb_clear_halt() needs a thread context */
929 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
930 unlink_urbs (dev, &dev->txq);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800931 status = usb_autopm_get_interface(dev->intf);
932 if (status < 0)
933 goto fail_pipe;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 status = usb_clear_halt (dev->udev, dev->out);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800935 usb_autopm_put_interface(dev->intf);
Joe Perches8e95a202009-12-03 07:58:21 +0000936 if (status < 0 &&
937 status != -EPIPE &&
938 status != -ESHUTDOWN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 if (netif_msg_tx_err (dev))
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800940fail_pipe:
Joe Perches60b86752010-02-17 10:30:23 +0000941 netdev_err(dev->net, "can't clear tx halt, status %d\n",
942 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 } else {
944 clear_bit (EVENT_TX_HALT, &dev->flags);
David Brownellf29fc252005-08-31 09:52:31 -0700945 if (status != -ESHUTDOWN)
946 netif_wake_queue (dev->net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 }
948 }
949 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
950 unlink_urbs (dev, &dev->rxq);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800951 status = usb_autopm_get_interface(dev->intf);
952 if (status < 0)
953 goto fail_halt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 status = usb_clear_halt (dev->udev, dev->in);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800955 usb_autopm_put_interface(dev->intf);
Joe Perches8e95a202009-12-03 07:58:21 +0000956 if (status < 0 &&
957 status != -EPIPE &&
958 status != -ESHUTDOWN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 if (netif_msg_rx_err (dev))
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800960fail_halt:
Joe Perches60b86752010-02-17 10:30:23 +0000961 netdev_err(dev->net, "can't clear rx halt, status %d\n",
962 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 } else {
964 clear_bit (EVENT_RX_HALT, &dev->flags);
965 tasklet_schedule (&dev->bh);
966 }
967 }
968
969 /* tasklet could resubmit itself forever if memory is tight */
970 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
971 struct urb *urb = NULL;
David S. Millerdacb3972010-08-10 02:50:55 -0700972 int resched = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973
974 if (netif_running (dev->net))
975 urb = usb_alloc_urb (0, GFP_KERNEL);
976 else
977 clear_bit (EVENT_RX_MEMORY, &dev->flags);
978 if (urb != NULL) {
979 clear_bit (EVENT_RX_MEMORY, &dev->flags);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800980 status = usb_autopm_get_interface(dev->intf);
Jesper Juhlab607072011-02-10 10:58:45 +0000981 if (status < 0) {
982 usb_free_urb(urb);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800983 goto fail_lowmem;
Jesper Juhlab607072011-02-10 10:58:45 +0000984 }
David S. Millerdacb3972010-08-10 02:50:55 -0700985 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
986 resched = 0;
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800987 usb_autopm_put_interface(dev->intf);
988fail_lowmem:
David S. Millerdacb3972010-08-10 02:50:55 -0700989 if (resched)
990 tasklet_schedule (&dev->bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 }
992 }
993
David Hollis7ea13c92005-04-22 15:07:02 -0700994 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
David Brownellcb1cebb2007-02-15 18:52:30 -0800995 struct driver_info *info = dev->driver_info;
David Hollis7ea13c92005-04-22 15:07:02 -0700996 int retval = 0;
997
998 clear_bit (EVENT_LINK_RESET, &dev->flags);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800999 status = usb_autopm_get_interface(dev->intf);
1000 if (status < 0)
1001 goto skip_reset;
David Hollis7ea13c92005-04-22 15:07:02 -07001002 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001003 usb_autopm_put_interface(dev->intf);
1004skip_reset:
Joe Perches60b86752010-02-17 10:30:23 +00001005 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1006 retval,
1007 dev->udev->bus->bus_name,
1008 dev->udev->devpath,
1009 info->description);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001010 } else {
1011 usb_autopm_put_interface(dev->intf);
David Hollis7ea13c92005-04-22 15:07:02 -07001012 }
1013 }
1014
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 if (dev->flags)
Joe Perches60b86752010-02-17 10:30:23 +00001016 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017}
1018
1019/*-------------------------------------------------------------------------*/
1020
David Howells7d12e782006-10-05 14:55:46 +01001021static void tx_complete (struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022{
1023 struct sk_buff *skb = (struct sk_buff *) urb->context;
1024 struct skb_data *entry = (struct skb_data *) skb->cb;
1025 struct usbnet *dev = entry->dev;
1026
1027 if (urb->status == 0) {
Alexey Orishko073285f2010-11-29 23:23:27 +00001028 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1029 dev->net->stats.tx_packets++;
Herbert Xu79638372009-06-29 16:53:28 +00001030 dev->net->stats.tx_bytes += entry->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 } else {
Herbert Xu79638372009-06-29 16:53:28 +00001032 dev->net->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
1034 switch (urb->status) {
1035 case -EPIPE:
David Brownell2e55cc72005-08-31 09:53:10 -07001036 usbnet_defer_kevent (dev, EVENT_TX_HALT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 break;
1038
1039 /* software-driven interface shutdown */
1040 case -ECONNRESET: // async unlink
1041 case -ESHUTDOWN: // hardware gone
1042 break;
1043
1044 // like rx, tx gets controller i/o faults during khubd delays
1045 // and so it uses the same throttling mechanism.
Pete Zaitcev38e2bfc2006-09-18 22:49:02 -07001046 case -EPROTO:
1047 case -ETIME:
1048 case -EILSEQ:
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001049 usb_mark_last_busy(dev->udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 if (!timer_pending (&dev->delay)) {
1051 mod_timer (&dev->delay,
1052 jiffies + THROTTLE_JIFFIES);
Joe Perchesa475f602010-02-17 10:30:24 +00001053 netif_dbg(dev, link, dev->net,
1054 "tx throttle %d\n", urb->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 }
1056 netif_stop_queue (dev->net);
1057 break;
1058 default:
Joe Perchesa475f602010-02-17 10:30:24 +00001059 netif_dbg(dev, tx_err, dev->net,
1060 "tx err %d\n", entry->urb->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 break;
1062 }
1063 }
1064
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001065 usb_autopm_put_interface_async(dev->intf);
Ming Lei5b6e9bc2012-04-26 11:33:46 +08001066 (void) defer_bh(dev, skb, &dev->txq, tx_done);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067}
1068
1069/*-------------------------------------------------------------------------*/
1070
Stephen Hemminger777baa42009-03-20 19:35:54 +00001071void usbnet_tx_timeout (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072{
1073 struct usbnet *dev = netdev_priv(net);
1074
1075 unlink_urbs (dev, &dev->txq);
1076 tasklet_schedule (&dev->bh);
1077
1078 // FIXME: device recovery -- reset?
1079}
Stephen Hemminger777baa42009-03-20 19:35:54 +00001080EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
1082/*-------------------------------------------------------------------------*/
1083
Stephen Hemminger25a79c42009-08-31 19:50:45 +00001084netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1085 struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086{
1087 struct usbnet *dev = netdev_priv(net);
1088 int length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 struct urb *urb = NULL;
1090 struct skb_data *entry;
1091 struct driver_info *info = dev->driver_info;
1092 unsigned long flags;
Stephen Hemminger25a79c42009-08-31 19:50:45 +00001093 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
Konstantin Khlebnikov23ba0792011-11-07 05:54:58 +00001095 if (skb)
1096 skb_tx_timestamp(skb);
Michael Rieschf9b491e2011-09-29 04:06:26 +00001097
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 // some devices want funky USB-level framing, for
1099 // win32 driver (usually) and/or hardware quirks
1100 if (info->tx_fixup) {
1101 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1102 if (!skb) {
Alexey Orishko073285f2010-11-29 23:23:27 +00001103 if (netif_msg_tx_err(dev)) {
1104 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1105 goto drop;
1106 } else {
1107 /* cdc_ncm collected packet; waits for more */
1108 goto not_drop;
1109 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 }
1111 }
1112 length = skb->len;
1113
1114 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
Joe Perchesa475f602010-02-17 10:30:24 +00001115 netif_dbg(dev, tx_err, dev->net, "no urb\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 goto drop;
1117 }
1118
1119 entry = (struct skb_data *) skb->cb;
1120 entry->urb = urb;
1121 entry->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 entry->length = length;
1123
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1125 skb->data, skb->len, tx_complete, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
1127 /* don't assume the hardware handles USB_ZERO_PACKET
1128 * NOTE: strictly conforming cdc-ether devices should expect
1129 * the ZLP here, but ignore the one-byte packet.
Alexey Orishko073285f2010-11-29 23:23:27 +00001130 * NOTE2: CDC NCM specification is different from CDC ECM when
1131 * handling ZLP/short packets, so cdc_ncm driver will make short
1132 * packet itself if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 */
Elina Pashevab4d562e32010-04-06 14:23:07 +00001134 if (length % dev->maxpacket == 0) {
1135 if (!(info->flags & FLAG_SEND_ZLP)) {
Alexey Orishko073285f2010-11-29 23:23:27 +00001136 if (!(info->flags & FLAG_MULTI_PACKET)) {
1137 urb->transfer_buffer_length++;
1138 if (skb_tailroom(skb)) {
1139 skb->data[skb->len] = 0;
1140 __skb_put(skb, 1);
1141 }
Elina Pashevab4d562e32010-04-06 14:23:07 +00001142 }
1143 } else
1144 urb->transfer_flags |= URB_ZERO_PACKET;
Peter Korsgaard3e323f32007-06-27 08:48:15 +02001145 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001147 spin_lock_irqsave(&dev->txq.lock, flags);
1148 retval = usb_autopm_get_interface_async(dev->intf);
1149 if (retval < 0) {
1150 spin_unlock_irqrestore(&dev->txq.lock, flags);
1151 goto drop;
1152 }
1153
1154#ifdef CONFIG_PM
1155 /* if this triggers the device is still a sleep */
1156 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1157 /* transmission will be done in resume */
1158 usb_anchor_urb(urb, &dev->deferred);
1159 /* no use to process more packets */
1160 netif_stop_queue(net);
Hemant Kumar39707c22012-10-25 18:17:54 +00001161 usb_put_urb(urb);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001162 spin_unlock_irqrestore(&dev->txq.lock, flags);
Joe Perches60b86752010-02-17 10:30:23 +00001163 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001164 goto deferred;
1165 }
1166#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1169 case -EPIPE:
1170 netif_stop_queue (net);
David Brownell2e55cc72005-08-31 09:53:10 -07001171 usbnet_defer_kevent (dev, EVENT_TX_HALT);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001172 usb_autopm_put_interface_async(dev->intf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 break;
1174 default:
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001175 usb_autopm_put_interface_async(dev->intf);
Joe Perchesa475f602010-02-17 10:30:24 +00001176 netif_dbg(dev, tx_err, dev->net,
1177 "tx: submit urb err %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 break;
1179 case 0:
1180 net->trans_start = jiffies;
Ming Lei5b6e9bc2012-04-26 11:33:46 +08001181 __usbnet_queue_skb(&dev->txq, skb, tx_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 if (dev->txq.qlen >= TX_QLEN (dev))
1183 netif_stop_queue (net);
1184 }
1185 spin_unlock_irqrestore (&dev->txq.lock, flags);
1186
1187 if (retval) {
Joe Perchesa475f602010-02-17 10:30:24 +00001188 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189drop:
Herbert Xu79638372009-06-29 16:53:28 +00001190 dev->net->stats.tx_dropped++;
Alexey Orishko073285f2010-11-29 23:23:27 +00001191not_drop:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 if (skb)
1193 dev_kfree_skb_any (skb);
1194 usb_free_urb (urb);
Joe Perchesa475f602010-02-17 10:30:24 +00001195 } else
1196 netif_dbg(dev, tx_queued, dev->net,
1197 "> tx, len %d, type 0x%x\n", length, skb->protocol);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001198#ifdef CONFIG_PM
1199deferred:
1200#endif
Stephen Hemminger25a79c42009-08-31 19:50:45 +00001201 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202}
Stephen Hemminger777baa42009-03-20 19:35:54 +00001203EXPORT_SYMBOL_GPL(usbnet_start_xmit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204
Bjørn Mork85e87872012-09-02 22:26:18 +00001205static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
Ming Lei65841fd2012-06-19 21:15:53 +00001206{
1207 struct urb *urb;
1208 int i;
Bjørn Mork85e87872012-09-02 22:26:18 +00001209 int ret = 0;
Ming Lei65841fd2012-06-19 21:15:53 +00001210
1211 /* don't refill the queue all at once */
1212 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1213 urb = usb_alloc_urb(0, flags);
1214 if (urb != NULL) {
Bjørn Mork85e87872012-09-02 22:26:18 +00001215 ret = rx_submit(dev, urb, flags);
1216 if (ret)
1217 goto err;
1218 } else {
1219 ret = -ENOMEM;
1220 goto err;
Ming Lei65841fd2012-06-19 21:15:53 +00001221 }
1222 }
Bjørn Mork85e87872012-09-02 22:26:18 +00001223err:
1224 return ret;
Ming Lei65841fd2012-06-19 21:15:53 +00001225}
1226
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227/*-------------------------------------------------------------------------*/
1228
1229// tasklet (work deferred from completions, in_irq) or timer
1230
1231static void usbnet_bh (unsigned long param)
1232{
1233 struct usbnet *dev = (struct usbnet *) param;
1234 struct sk_buff *skb;
1235 struct skb_data *entry;
1236
1237 while ((skb = skb_dequeue (&dev->done))) {
1238 entry = (struct skb_data *) skb->cb;
1239 switch (entry->state) {
David Brownell18ab4582007-05-25 12:31:32 -07001240 case rx_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 entry->state = rx_cleanup;
1242 rx_process (dev, skb);
1243 continue;
David Brownell18ab4582007-05-25 12:31:32 -07001244 case tx_done:
1245 case rx_cleanup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 usb_free_urb (entry->urb);
1247 dev_kfree_skb (skb);
1248 continue;
David Brownell18ab4582007-05-25 12:31:32 -07001249 default:
Joe Perches60b86752010-02-17 10:30:23 +00001250 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 }
1252 }
1253
1254 // waiting for all pending urbs to complete?
1255 if (dev->wait) {
1256 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1257 wake_up (dev->wait);
1258 }
1259
1260 // or are we maybe short a few urbs?
Joe Perches8e95a202009-12-03 07:58:21 +00001261 } else if (netif_running (dev->net) &&
1262 netif_device_present (dev->net) &&
1263 !timer_pending (&dev->delay) &&
1264 !test_bit (EVENT_RX_HALT, &dev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 int temp = dev->rxq.qlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266
Ming Lei65841fd2012-06-19 21:15:53 +00001267 if (temp < RX_QLEN(dev)) {
Bjørn Mork85e87872012-09-02 22:26:18 +00001268 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1269 return;
Joe Perchesa475f602010-02-17 10:30:24 +00001270 if (temp != dev->rxq.qlen)
1271 netif_dbg(dev, link, dev->net,
1272 "rxqlen %d --> %d\n",
1273 temp, dev->rxq.qlen);
Ming Lei65841fd2012-06-19 21:15:53 +00001274 if (dev->rxq.qlen < RX_QLEN(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 tasklet_schedule (&dev->bh);
1276 }
1277 if (dev->txq.qlen < TX_QLEN (dev))
1278 netif_wake_queue (dev->net);
1279 }
1280}
1281
1282
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283/*-------------------------------------------------------------------------
1284 *
1285 * USB Device Driver support
1286 *
1287 *-------------------------------------------------------------------------*/
David Brownellcb1cebb2007-02-15 18:52:30 -08001288
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289// precondition: never called in_interrupt
1290
David Brownell38bde1d2005-08-31 09:52:45 -07001291void usbnet_disconnect (struct usb_interface *intf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292{
1293 struct usbnet *dev;
1294 struct usb_device *xdev;
1295 struct net_device *net;
1296
1297 dev = usb_get_intfdata(intf);
1298 usb_set_intfdata(intf, NULL);
1299 if (!dev)
1300 return;
1301
1302 xdev = interface_to_usbdev (intf);
1303
Joe Perchesa475f602010-02-17 10:30:24 +00001304 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1305 intf->dev.driver->name,
1306 xdev->bus->bus_name, xdev->devpath,
1307 dev->driver_info->description);
David Brownellcb1cebb2007-02-15 18:52:30 -08001308
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 net = dev->net;
1310 unregister_netdev (net);
1311
Tejun Heo23f333a2010-12-12 16:45:14 +01001312 cancel_work_sync(&dev->kevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
Hemant Kumar39707c22012-10-25 18:17:54 +00001314 usb_scuttle_anchored_urbs(&dev->deferred);
1315
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 if (dev->driver_info->unbind)
1317 dev->driver_info->unbind (dev, intf);
1318
Paul Stewart68972ef2011-04-28 05:43:37 +00001319 usb_kill_urb(dev->interrupt);
1320 usb_free_urb(dev->interrupt);
1321
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 free_netdev(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323}
David Brownell38bde1d2005-08-31 09:52:45 -07001324EXPORT_SYMBOL_GPL(usbnet_disconnect);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
Stephen Hemminger777baa42009-03-20 19:35:54 +00001326static const struct net_device_ops usbnet_netdev_ops = {
1327 .ndo_open = usbnet_open,
1328 .ndo_stop = usbnet_stop,
1329 .ndo_start_xmit = usbnet_start_xmit,
1330 .ndo_tx_timeout = usbnet_tx_timeout,
1331 .ndo_change_mtu = usbnet_change_mtu,
1332 .ndo_set_mac_address = eth_mac_addr,
1333 .ndo_validate_addr = eth_validate_addr,
1334};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335
1336/*-------------------------------------------------------------------------*/
1337
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338// precondition: never called in_interrupt
1339
Marcel Holtmann225794f2009-10-02 05:15:26 +00001340static struct device_type wlan_type = {
1341 .name = "wlan",
1342};
1343
1344static struct device_type wwan_type = {
1345 .name = "wwan",
1346};
1347
David Brownell38bde1d2005-08-31 09:52:45 -07001348int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1350{
1351 struct usbnet *dev;
David Brownellcb1cebb2007-02-15 18:52:30 -08001352 struct net_device *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 struct usb_host_interface *interface;
1354 struct driver_info *info;
1355 struct usb_device *xdev;
1356 int status;
David Brownell296c0242007-04-17 16:10:10 -07001357 const char *name;
Ming Leib0786b42010-11-01 07:11:54 -07001358 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1359
1360 /* usbnet already took usb runtime pm, so have to enable the feature
1361 * for usb interface, otherwise usb_autopm_get_interface may return
1362 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1363 */
1364 if (!driver->supports_autosuspend) {
1365 driver->supports_autosuspend = 1;
1366 pm_runtime_enable(&udev->dev);
1367 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
David Brownell296c0242007-04-17 16:10:10 -07001369 name = udev->dev.driver->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 info = (struct driver_info *) prod->driver_info;
1371 if (!info) {
David Brownell296c0242007-04-17 16:10:10 -07001372 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 return -ENODEV;
1374 }
1375 xdev = interface_to_usbdev (udev);
1376 interface = udev->cur_altsetting;
1377
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 status = -ENOMEM;
1379
1380 // set up our own records
1381 net = alloc_etherdev(sizeof(*dev));
Joe Perches41de8d42012-01-29 13:47:52 +00001382 if (!net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
Ben Hutchings0dacca72010-07-02 21:49:02 -07001385 /* netdev_printk() needs this so do it as early as possible */
1386 SET_NETDEV_DEV(net, &udev->dev);
1387
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 dev = netdev_priv(net);
1389 dev->udev = xdev;
Oliver Neukuma11a6542007-08-03 13:52:19 +02001390 dev->intf = udev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 dev->driver_info = info;
David Brownell296c0242007-04-17 16:10:10 -07001392 dev->driver_name = name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1394 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1395 skb_queue_head_init (&dev->rxq);
1396 skb_queue_head_init (&dev->txq);
1397 skb_queue_head_init (&dev->done);
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +03001398 skb_queue_head_init(&dev->rxq_pause);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 dev->bh.func = usbnet_bh;
1400 dev->bh.data = (unsigned long) dev;
David Howellsc4028952006-11-22 14:57:56 +00001401 INIT_WORK (&dev->kevent, kevent);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001402 init_usb_anchor(&dev->deferred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 dev->delay.function = usbnet_bh;
1404 dev->delay.data = (unsigned long) dev;
1405 init_timer (&dev->delay);
Arnd Bergmanna9fc6332006-10-09 00:08:02 +02001406 mutex_init (&dev->phy_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 dev->net = net;
1409 strcpy (net->name, "usb%d");
1410 memcpy (net->dev_addr, node_id, sizeof node_id);
1411
David Brownell2e55cc72005-08-31 09:53:10 -07001412 /* rx and tx sides can use different message sizes;
1413 * bind() should set rx_urb_size in that case.
1414 */
1415 dev->hard_mtu = net->mtu + net->hard_header_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416#if 0
1417// dma_supported() is deeply broken on almost all architectures
1418 // possible with some EHCI controllers
Yang Hongyang6a355282009-04-06 19:01:13 -07001419 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 net->features |= NETIF_F_HIGHDMA;
1421#endif
1422
Stephen Hemminger777baa42009-03-20 19:35:54 +00001423 net->netdev_ops = &usbnet_netdev_ops;
Stephen Hemminger777baa42009-03-20 19:35:54 +00001424 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 net->ethtool_ops = &usbnet_ethtool_ops;
1426
1427 // allow device-specific bind/init procedures
1428 // NOTE net->name still not usable ...
1429 if (info->bind) {
1430 status = info->bind (dev, udev);
David Brownellcb1cebb2007-02-15 18:52:30 -08001431 if (status < 0)
1432 goto out1;
1433
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 // heuristic: "usb%d" for links we know are two-host,
1435 // else "eth%d" when there's reasonable doubt. userspace
1436 // can rename the link if it knows better.
Joe Perches8e95a202009-12-03 07:58:21 +00001437 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
Arnd Bergmannc2613442011-04-01 20:12:02 -07001438 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1439 (net->dev_addr [0] & 0x02) == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 strcpy (net->name, "eth%d");
Jussi Kivilinna6e3bbcc2008-01-26 00:51:06 +02001441 /* WLAN devices should always be named "wlan%d" */
1442 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1443 strcpy(net->name, "wlan%d");
Marcel Holtmanne1e499e2009-10-02 05:15:25 +00001444 /* WWAN devices should always be named "wwan%d" */
1445 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1446 strcpy(net->name, "wwan%d");
David Brownellf29fc252005-08-31 09:52:31 -07001447
1448 /* maybe the remote can't receive an Ethernet MTU */
1449 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1450 net->mtu = dev->hard_mtu - net->hard_header_len;
David Brownell2e55cc72005-08-31 09:53:10 -07001451 } else if (!info->in || !info->out)
1452 status = usbnet_get_endpoints (dev, udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 else {
1454 dev->in = usb_rcvbulkpipe (xdev, info->in);
1455 dev->out = usb_sndbulkpipe (xdev, info->out);
1456 if (!(info->flags & FLAG_NO_SETINT))
1457 status = usb_set_interface (xdev,
1458 interface->desc.bInterfaceNumber,
1459 interface->desc.bAlternateSetting);
1460 else
1461 status = 0;
1462
1463 }
Peter Korsgaard9514bfe2007-07-03 00:46:42 +02001464 if (status >= 0 && dev->status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 status = init_status (dev, udev);
1466 if (status < 0)
David Brownellcb1cebb2007-02-15 18:52:30 -08001467 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468
David Brownell2e55cc72005-08-31 09:53:10 -07001469 if (!dev->rx_urb_size)
1470 dev->rx_urb_size = dev->hard_mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
David Brownellcb1cebb2007-02-15 18:52:30 -08001472
Marcel Holtmann225794f2009-10-02 05:15:26 +00001473 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1474 SET_NETDEV_DEVTYPE(net, &wlan_type);
1475 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1476 SET_NETDEV_DEVTYPE(net, &wwan_type);
1477
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 status = register_netdev (net);
1479 if (status)
tom.leiming@gmail.coma4723842012-04-29 22:51:03 +00001480 goto out4;
Joe Perchesa475f602010-02-17 10:30:24 +00001481 netif_info(dev, probe, dev->net,
1482 "register '%s' at usb-%s-%s, %s, %pM\n",
1483 udev->dev.driver->name,
1484 xdev->bus->bus_name, xdev->devpath,
1485 dev->driver_info->description,
1486 net->dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
1488 // ok, it's ready to go.
1489 usb_set_intfdata (udev, dev);
1490
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 netif_device_attach (net);
1492
Ben Hutchings37e82732009-11-04 15:29:52 +00001493 if (dev->driver_info->flags & FLAG_LINK_INTR)
1494 netif_carrier_off(net);
1495
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 return 0;
1497
tom.leiming@gmail.coma4723842012-04-29 22:51:03 +00001498out4:
1499 usb_free_urb(dev->interrupt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500out3:
1501 if (info->unbind)
1502 info->unbind (dev, udev);
1503out1:
1504 free_netdev(net);
1505out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 return status;
1507}
David Brownell38bde1d2005-08-31 09:52:45 -07001508EXPORT_SYMBOL_GPL(usbnet_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509
1510/*-------------------------------------------------------------------------*/
1511
Oliver Neukum36433122007-04-30 01:37:44 -07001512/*
1513 * suspend the whole driver as soon as the first interface is suspended
1514 * resume only when the last interface is resumed
David Brownell38bde1d2005-08-31 09:52:45 -07001515 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
David Brownell38bde1d2005-08-31 09:52:45 -07001517int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518{
1519 struct usbnet *dev = usb_get_intfdata(intf);
David Brownellcb1cebb2007-02-15 18:52:30 -08001520
Oliver Neukum36433122007-04-30 01:37:44 -07001521 if (!dev->suspend_count++) {
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001522 spin_lock_irq(&dev->txq.lock);
1523 /* don't autosuspend while transmitting */
Alan Stern5b1b0b82011-08-19 23:49:48 +02001524 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
Ming Lei5eeb3132012-06-19 21:15:52 +00001525 dev->suspend_count--;
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001526 spin_unlock_irq(&dev->txq.lock);
1527 return -EBUSY;
1528 } else {
1529 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1530 spin_unlock_irq(&dev->txq.lock);
1531 }
Oliver Neukuma11a6542007-08-03 13:52:19 +02001532 /*
1533 * accelerate emptying of the rx and queues, to avoid
Oliver Neukum36433122007-04-30 01:37:44 -07001534 * having everything error out.
1535 */
1536 netif_device_detach (dev->net);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001537 usbnet_terminate_urbs(dev);
1538 usb_kill_urb(dev->interrupt);
1539
Oliver Neukuma11a6542007-08-03 13:52:19 +02001540 /*
1541 * reattach so runtime management can use and
1542 * wake the device
1543 */
1544 netif_device_attach (dev->net);
Oliver Neukum36433122007-04-30 01:37:44 -07001545 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 return 0;
1547}
David Brownell38bde1d2005-08-31 09:52:45 -07001548EXPORT_SYMBOL_GPL(usbnet_suspend);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549
David Brownell38bde1d2005-08-31 09:52:45 -07001550int usbnet_resume (struct usb_interface *intf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551{
1552 struct usbnet *dev = usb_get_intfdata(intf);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001553 struct sk_buff *skb;
1554 struct urb *res;
1555 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001557 if (!--dev->suspend_count) {
Paul Stewart68972ef2011-04-28 05:43:37 +00001558 /* resume interrupt URBs */
1559 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags))
1560 usb_submit_urb(dev->interrupt, GFP_NOIO);
1561
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001562 spin_lock_irq(&dev->txq.lock);
1563 while ((res = usb_get_from_anchor(&dev->deferred))) {
1564
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001565 skb = (struct sk_buff *)res->context;
1566 retval = usb_submit_urb(res, GFP_ATOMIC);
1567 if (retval < 0) {
1568 dev_kfree_skb_any(skb);
1569 usb_free_urb(res);
1570 usb_autopm_put_interface_async(dev->intf);
1571 } else {
1572 dev->net->trans_start = jiffies;
1573 __skb_queue_tail(&dev->txq, skb);
1574 }
1575 }
1576
1577 smp_mb();
1578 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1579 spin_unlock_irq(&dev->txq.lock);
Ming Lei75bd0cb2011-04-28 22:37:09 +00001580
1581 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
Ming Lei65841fd2012-06-19 21:15:53 +00001582 /* handle remote wakeup ASAP */
1583 if (!dev->wait &&
1584 netif_device_present(dev->net) &&
1585 !timer_pending(&dev->delay) &&
1586 !test_bit(EVENT_RX_HALT, &dev->flags))
Oliver Neukumab6f1482012-08-26 20:41:38 +00001587 rx_alloc_submit(dev, GFP_NOIO);
Ming Lei65841fd2012-06-19 21:15:53 +00001588
Ming Lei75bd0cb2011-04-28 22:37:09 +00001589 if (!(dev->txq.qlen >= TX_QLEN(dev)))
Alexey Orishko1aa9bc52012-03-14 04:00:24 +00001590 netif_tx_wake_all_queues(dev->net);
Ming Lei75bd0cb2011-04-28 22:37:09 +00001591 tasklet_schedule (&dev->bh);
1592 }
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001593 }
Oliver Neukum5d9d01a32012-10-11 02:50:10 +00001594
1595 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1596 usb_autopm_get_interface_no_resume(intf);
1597
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 return 0;
1599}
David Brownell38bde1d2005-08-31 09:52:45 -07001600EXPORT_SYMBOL_GPL(usbnet_resume);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601
Oliver Neukum5d9d01a32012-10-11 02:50:10 +00001602/*
1603 * Either a subdriver implements manage_power, then it is assumed to always
1604 * be ready to be suspended or it reports the readiness to be suspended
1605 * explicitly
1606 */
1607void usbnet_device_suggests_idle(struct usbnet *dev)
1608{
1609 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1610 dev->intf->needs_remote_wakeup = 1;
1611 usb_autopm_put_interface_async(dev->intf);
1612 }
1613}
1614EXPORT_SYMBOL(usbnet_device_suggests_idle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615
1616/*-------------------------------------------------------------------------*/
1617
David Brownellf29fc252005-08-31 09:52:31 -07001618static int __init usbnet_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619{
Thiago Farinac582a952011-04-17 17:49:21 -07001620 /* Compiler should optimize this out. */
1621 BUILD_BUG_ON(
1622 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623
Joe Perchesc7e12ea2012-07-12 19:33:07 +00001624 eth_random_addr(node_id);
David Brownellcb1cebb2007-02-15 18:52:30 -08001625 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626}
David Brownellf29fc252005-08-31 09:52:31 -07001627module_init(usbnet_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628
David Brownellf29fc252005-08-31 09:52:31 -07001629static void __exit usbnet_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631}
David Brownellf29fc252005-08-31 09:52:31 -07001632module_exit(usbnet_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633
David Brownellf29fc252005-08-31 09:52:31 -07001634MODULE_AUTHOR("David Brownell");
David Brownell090ffa92005-08-31 09:54:50 -07001635MODULE_DESCRIPTION("USB network driver framework");
David Brownellf29fc252005-08-31 09:52:31 -07001636MODULE_LICENSE("GPL");